* [PATCH 1/2] dt-bindings: can: tcan4x5x: Add DT bindings for TCAN4x5X driver @ 2018-09-10 20:12 Dan Murphy 2018-09-10 20:12 ` [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel Dan Murphy 2018-09-26 17:40 ` [PATCH 1/2] dt-bindings: can: tcan4x5x: Add DT bindings for TCAN4x5X driver Dan Murphy 0 siblings, 2 replies; 10+ messages in thread From: Dan Murphy @ 2018-09-10 20:12 UTC (permalink / raw) To: wg, mkl, davem; +Cc: linux-can, netdev, linux-kernel, Dan Murphy DT binding documentation for TI TCAN4x5x driver. Signed-off-by: Dan Murphy <dmurphy@ti.com> --- .../devicetree/bindings/net/can/tcan4x5x.txt | 33 +++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/can/tcan4x5x.txt diff --git a/Documentation/devicetree/bindings/net/can/tcan4x5x.txt b/Documentation/devicetree/bindings/net/can/tcan4x5x.txt new file mode 100644 index 000000000000..3eea2f2bb8a7 --- /dev/null +++ b/Documentation/devicetree/bindings/net/can/tcan4x5x.txt @@ -0,0 +1,33 @@ +Texas Instruments TCAN4x5x CAN Controller +================================================ + +This file provides device node information for the TCAN4x5x interface contains. + +Required properties: + - compatible: "ti,tcan4x5x" + - reg: 0 + - #address-cells : 1 + - #size-cells : 0 + - spi-max-frequency: Maximum frequency of the SPI bus the chip can + operate at should be less than or equal to 18 MHz. + - data-ready-gpios: Interrupt GPIO for data and error reporting. + - wake-up-gpios: Wake up GPIO to wake up the TCAN device + +Optional properties: + - clocks: Processor clock phandles (see clock bindings for details) + If no clock is defined then the default 40MHz freq is set. + - reset-gpios: Hardwired output GPIO. If not defined then software + reset. + +Example: +tcan4x5x: tcan4x5x@0 { + compatible = "ti,tcan4x5x"; + reg = <0>; + #address-cells = <1>; + #size-cells = <1>; + clocks = <&tclkin_ck>; + spi-max-frequency = <10000000>; + data-ready-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>; + wake-up-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>; + reset-gpios = <&gpio1 27 GPIO_ACTIVE_LOW>; + }; -- 2.17.0.1855.g63749b2dea ^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel 2018-09-10 20:12 [PATCH 1/2] dt-bindings: can: tcan4x5x: Add DT bindings for TCAN4x5X driver Dan Murphy @ 2018-09-10 20:12 ` Dan Murphy 2018-09-26 17:40 ` Dan Murphy 2018-09-26 17:40 ` [PATCH 1/2] dt-bindings: can: tcan4x5x: Add DT bindings for TCAN4x5X driver Dan Murphy 1 sibling, 1 reply; 10+ messages in thread From: Dan Murphy @ 2018-09-10 20:12 UTC (permalink / raw) To: wg, mkl, davem; +Cc: linux-can, netdev, linux-kernel, Dan Murphy Add the TCAN4x5x SPI CAN driver. This device uses the Bosch MCAN IP core along with a SPI interface map. The register and data are 32 bits wide. Signed-off-by: Dan Murphy <dmurphy@ti.com> --- drivers/net/can/spi/Kconfig | 5 + drivers/net/can/spi/Makefile | 1 + drivers/net/can/spi/tcan4x5x.c | 1206 ++++++++++++++++++++++++++++++++ drivers/net/can/spi/tcan4x5x.h | 109 +++ 4 files changed, 1321 insertions(+) create mode 100644 drivers/net/can/spi/tcan4x5x.c create mode 100644 drivers/net/can/spi/tcan4x5x.h diff --git a/drivers/net/can/spi/Kconfig b/drivers/net/can/spi/Kconfig index 8f2e0dd7b756..8cac6ce37506 100644 --- a/drivers/net/can/spi/Kconfig +++ b/drivers/net/can/spi/Kconfig @@ -13,4 +13,9 @@ config CAN_MCP251X ---help--- Driver for the Microchip MCP251x SPI CAN controllers. +config CAN_TCAN4X5X + tristate "Texas Instruments TCAN4X5X SPI CAN controllers" + depends on HAS_DMA + ---help--- + Driver for the Texas Instruments TCAN4X5X SPI CAN controllers. endmenu diff --git a/drivers/net/can/spi/Makefile b/drivers/net/can/spi/Makefile index f59fa3731073..8ecaace7a920 100644 --- a/drivers/net/can/spi/Makefile +++ b/drivers/net/can/spi/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_CAN_HI311X) += hi311x.o obj-$(CONFIG_CAN_MCP251X) += mcp251x.o +obj-$(CONFIG_CAN_TCAN4X5X) += tcan4x5x.o diff --git a/drivers/net/can/spi/tcan4x5x.c b/drivers/net/can/spi/tcan4x5x.c new file mode 100644 index 000000000000..ca3753efe35a --- /dev/null +++ b/drivers/net/can/spi/tcan4x5x.c @@ -0,0 +1,1206 @@ +// SPDX-License-Identifier: GPL-2.0 +// SPI to CAN driver for the Texas Instruments TCAN4x5x +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ + +#include <linux/can/core.h> +#include <linux/can/dev.h> +#include <linux/can/led.h> +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/freezer.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/uaccess.h> + +#include <linux/regulator/consumer.h> +#include <linux/gpio/consumer.h> + +#include "tcan4x5x.h" + +#define DEVICE_NAME "tcan4x5x" +#define TCAN4X5X_EXT_CLK_DEF 40000000 + +#define TCAN4X5X_CLEAR_ALL_INT 0xffffffff +#define TCAN4X5X_SET_ALL_INT 0xffffffff + +#define TCAN4X5X_TX_ECHO_SKB_MAX 1 +#define TCAN4X5X_DATA_PKT_OFF 2 +#define TCAN4X5X_WRITE_CMD (0x61 << 24) +#define TCAN4X5X_READ_CMD (0x41 << 24) + +#define TCAN4X5X_SID_SHIFT 18 +#define TCAN4X5X_DLC_SHIFT 16 + +#define TCAN4X5X_ESI_SHIFT 31 +#define TCAN4X5X_XTD_SHIFT 30 +#define TCAN4X5X_RTR_SHIFT 29 +#define TCAN4X5X_FDF_SHIFT 21 +#define TCAN4X5X_BRS_SHIFT 20 +#define TCAN4X5X_DLC_SHIFT 16 + +#define TCAN4X5X_ESI_MASK BIT(31) +#define TCAN4X5X_XTD_MASK BIT(30) +#define TCAN4X5X_RTR_MASK BIT(29) + +#define TCAN4X5X_DLC_MASK 0xf0000 +#define TCAN4X5X_SW_RESET BIT(2) + +#define TCAN4X5X_MODE_SEL_MASK (BIT(7) | BIT(6)) +#define TCAN4X5X_MODE_SLEEP 0x00 +#define TCAN4X5X_MODE_STANDBY BIT(6) +#define TCAN4X5X_MODE_NORMAL BIT(7) +#define TCAN4X5X_MCAN_CONFIGURED BIT(5) +#define TCAN4X5X_WATCHDOG_EN BIT(3) +#define TCAN4X5X_WD_60_MS_TIMER 0 +#define TCAN4X5X_WD_600_MS_TIMER BIT(28) +#define TCAN4X5X_WD_3_S_TIMER BIT(29) +#define TCAN4X5X_WD_6_S_TIMER (BIT(28) | BIT(29)) + +/* Nominal Bit Timing & Prescaler Register */ +#define TCAN4X5X_NSJW_SHIFT 25 +#define TCAN4X5X_NBRP_SHIFT 16 +#define TCAN4X5X_NTSEG1_SHIFT 8 + +#define TCAN4X5X_TDCR_TDCO_SHIFT 8 + +/* Data Bit Timing & Prescaler Register (DBTP) */ +#define DBTP_TDC BIT(23) +#define DBTP_DBRP_SHIFT 16 +#define DBTP_DBRP_MASK (0x1f << DBTP_DBRP_SHIFT) +#define DBTP_DTSEG1_SHIFT 8 +#define DBTP_DTSEG1_MASK (0x1f << DBTP_DTSEG1_SHIFT) +#define DBTP_DTSEG2_SHIFT 4 +#define DBTP_DTSEG2_MASK (0xf << DBTP_DTSEG2_SHIFT) +#define DBTP_DSJW_SHIFT 0 +#define DBTP_DSJW_MASK (0xf << DBTP_DSJW_SHIFT) + +#define TCAN4x5x_QUEUE_LVL_MASK 0x1f +#define TCAN4x5x_QUEUE_IDX_SHIFT 16 +#define TCAN4x5x_QUEUE_IDX_MASK 0x1f00 + +#define TCAN4X5X_CANBUSNOM_INT_EN BIT(14) + +#define TCAN4X5X_NUM_TX_BUF 5 +#define TCAN4X5X_TX_QUEUE_SHIFT 24 +#define TCAN4X5X_TX_NDTB_SHIFT 16 +#define TCAN4X5X_TX_BUF_START 0x324 + +#define TCAN4X5X_NUM_RX_BUF 3 +#define TCAN4X5X_RX_WATER_MARK 2 +#define TCAN4X5X_RX_WATER_MARK_SHIFT 24 +#define TCAN4X5X_RX_FIFO_SZ_SHIFT 16 +#define TCAN4X5X_RX_BUF_START 0x4 + +#define TCAN4X5X_RX_F1DS_SHIFT 4 +#define TCAN4X5X_RX_RBDS_SHIFT 8 + +#define TCAN4X5X_RX_FIFO0_MESSAGE BIT(0) +#define TCAN4X5X_RX_FIFO1_MESSAGE BIT(4) +#define TCAN4X5X_RX_BUFFER_MESSAGE BIT(19) +#define TCAN4X5X_RX_INDEX_MASK 0x3f00 +#define TCAN4X5X_RX_INDEX_SHIFT 8 + +#define TCAN4X5X_RX_ADDR_OFFSET 0x8000 +#define TCAN4X5X_RX_BUF_ADDR_OFFSET 0x8100 +#define TCAN4X5X_RX_ADDR_MASK 0xffff + +#define TCAN4X5X_ERR_PROTOCOL_MASK 0x7 +#define TCAN4X5X_ERR_STUFERR 0x1 +#define TCAN4X5X_ERR_FRMERR 0x2 +#define TCAN4X5X_ERR_ACKERR 0x3 +#define TCAN4X5X_ERR_BIT1ERR 0x4 +#define TCAN4X5X_ERR_BIT0ERR 0x5 +#define TCAN4X5X_ERR_CRCERR 0x6 + +/* Interrupt bits */ +#define TCAN4X5X_CANBUSTERMOPEN_INT_EN BIT(30) +#define TCAN4X5X_CANHCANL_INT_EN BIT(29) +#define TCAN4X5X_CANHBAT_INT_EN BIT(28) +#define TCAN4X5X_CANLGND_INT_EN BIT(27) +#define TCAN4X5X_CANBUSOPEN_INT_EN BIT(26) +#define TCAN4X5X_CANBUSGND_INT_EN BIT(25) +#define TCAN4X5X_CANBUSBAT_INT_EN BIT(24) +#define TCAN4X5X_UVSUP_INT_EN BIT(22) +#define TCAN4X5X_UVIO_INT_EN BIT(21) +#define TCAN4X5X_TSD_INT_EN BIT(19) +#define TCAN4X5X_ECCERR_INT_EN BIT(16) +#define TCAN4X5X_CANINT_INT_EN BIT(15) +#define TCAN4X5X_LWU_INT_EN BIT(14) +#define TCAN4X5X_CANSLNT_INT_EN BIT(10) +#define TCAN4X5X_CANDOM_INT_EN BIT(8) +#define TCAN4X5X_CANBUS_ERR_INT_EN BIT(5) +#define TCAN4X5X_BUS_FAULT BIT(4) +#define TCAN4X5X_MCAN_INT BIT(1) +#define TCAN4X5X_ENABLE_ALL_INT (TCAN4X5X_MCAN_INT | \ + TCAN4X5X_BUS_FAULT | \ + TCAN4X5X_CANBUS_ERR_INT_EN | \ + TCAN4X5X_CANINT_INT_EN) + +/* MCAN Interrupt bits */ +#define TCAN4X5X_MCAN_IR_ARA BIT(29) +#define TCAN4X5X_MCAN_IR_PED BIT(28) +#define TCAN4X5X_MCAN_IR_PEA BIT(27) +#define TCAN4X5X_MCAN_IR_WD BIT(26) +#define TCAN4X5X_MCAN_IR_BO BIT(25) +#define TCAN4X5X_MCAN_IR_EW BIT(24) +#define TCAN4X5X_MCAN_IR_EP BIT(23) +#define TCAN4X5X_MCAN_IR_ELO BIT(22) +#define TCAN4X5X_MCAN_IR_BEU BIT(21) +#define TCAN4X5X_MCAN_IR_BEC BIT(20) +#define TCAN4X5X_MCAN_IR_DRX BIT(19) +#define TCAN4X5X_MCAN_IR_TOO BIT(18) +#define TCAN4X5X_MCAN_IR_MRAF BIT(17) +#define TCAN4X5X_MCAN_IR_TSW BIT(16) +#define TCAN4X5X_MCAN_IR_TEFL BIT(15) +#define TCAN4X5X_MCAN_IR_TEFF BIT(14) +#define TCAN4X5X_MCAN_IR_TEFW BIT(13) +#define TCAN4X5X_MCAN_IR_TEFN BIT(12) +#define TCAN4X5X_MCAN_IR_TFE BIT(11) +#define TCAN4X5X_MCAN_IR_TCF BIT(10) +#define TCAN4X5X_MCAN_IR_TC BIT(9) +#define TCAN4X5X_MCAN_IR_HPM BIT(8) +#define TCAN4X5X_MCAN_IR_RF1L BIT(7) +#define TCAN4X5X_MCAN_IR_RF1F BIT(6) +#define TCAN4X5X_MCAN_IR_RF1W BIT(5) +#define TCAN4X5X_MCAN_IR_RF1N BIT(4) +#define TCAN4X5X_MCAN_IR_RF0L BIT(3) +#define TCAN4X5X_MCAN_IR_RF0F BIT(2) +#define TCAN4X5X_MCAN_IR_RF0W BIT(1) +#define TCAN4X5X_MCAN_IR_RF0N BIT(0) +#define TCAN4X5X_ENABLE_MCAN_INT (TCAN4X5X_MCAN_IR_TC | \ + TCAN4X5X_MCAN_IR_RF0N | \ + TCAN4X5X_MCAN_IR_RF1N | \ + TCAN4X5X_MCAN_IR_RF0F | \ + TCAN4X5X_MCAN_IR_RF1F) + +/* CCR bits */ +#define TCAN4X5X_CCCR_NISO_BOSCH BIT(15) +#define TCAN4X5X_CCCR_TXP BIT(15) +#define TCAN4X5X_CCCR_EFBI BIT(13) +#define TCAN4X5X_CCCR_PXHD_DIS BIT(12) +#define TCAN4X5X_CCCR_BRSE BIT(9) +#define TCAN4X5X_CCCR_FDOE BIT(8) +#define TCAN4X5X_CCCR_TEST BIT(7) +#define TCAN4X5X_CCCR_DAR_DIS BIT(6) +#define TCAN4X5X_CCCR_MON BIT(5) +#define TCAN4X5X_CCCR_CSR BIT(4) +#define TCAN4X5X_CCCR_CSA BIT(3) +#define TCAN4X5X_CCCR_ASM BIT(2) +#define TCAN4X5X_CCCR_CCE BIT(1) +#define TCAN4X5X_CCCR_INIT BIT(0) + +#define TCAN4X5X_EINT0 BIT(0) +#define TCAN4X5X_EINT1 BIT(1) + +struct tcan4x5x_rx_regs { + u32 fifo_status_reg; + u32 fifo_config_reg; + u32 fifo_ack_reg; + u32 rx_buf_shift; +}; + +struct tcan4x5x_rx_regs tcan4x5x_fifo_regs[] = { + { TCAN4X5X_MCAN_RXF0S, TCAN4X5X_MCAN_RXF0C, TCAN4X5X_MCAN_RXF0A, 0}, + { TCAN4X5X_MCAN_RXF1S, TCAN4X5X_MCAN_RXF1C, TCAN4X5X_MCAN_RXF1A, 4}, + { TCAN4X5X_MCAN_NDAT1, TCAN4X5X_MCAN_RXBC, TCAN4X5X_MCAN_NDAT1, 8}, +}; + +enum tcan4x5x_data_size { + TCAN4X5X_8_BYTE = 0, + TCAN4X5X_12_BYTE, + TCAN4X5X_16_BYTE, + TCAN4X5X_20_BYTE, + TCAN4X5X_24_BYTE, + TCAN4X5X_32_BYTE, + TCAN4X5X_48_BYTE, + TCAN4X5X_64_BYTE, +}; + +static const struct can_bittiming_const tcan4x5x_bittiming_const = { + .name = DEVICE_NAME, + .tseg1_min = 2, + .tseg1_max = 31, + .tseg2_min = 2, + .tseg2_max = 16, + .sjw_max = 16, + .brp_min = 1, + .brp_max = 32, + .brp_inc = 1, +}; + +static const struct can_bittiming_const tcan4x5x_data_bittiming_const = { + .name = DEVICE_NAME, + .tseg1_min = 1, + .tseg1_max = 32, + .tseg2_min = 1, + .tseg2_max = 16, + .sjw_max = 16, + .brp_min = 1, + .brp_max = 32, + .brp_inc = 1, +}; + +static void tcan4x5x_clean(struct net_device *net) +{ + struct tcan4x5x_priv *priv = netdev_priv(net); + + if (priv->tx_skb || priv->tx_len) + net->stats.tx_errors++; + if (priv->tx_skb) + dev_kfree_skb(priv->tx_skb); + if (priv->tx_len) + can_free_echo_skb(priv->net, 0); + + priv->tx_skb = NULL; + priv->tx_len = 0; +} + +static int regmap_spi_gather_write(void *context, const void *reg, + size_t reg_len, const void *val, + size_t val_len) +{ + struct device *dev = context; + struct spi_device *spi = to_spi_device(dev); + u32 addr; + struct spi_message m; + struct spi_transfer t[2] = {{ .tx_buf = &addr, .len = 4, .cs_change = 0,}, + { .tx_buf = val, .len = val_len, },}; + + addr = TCAN4X5X_WRITE_CMD | (*((u16 *)reg) << 8) | val_len >> 2; + + spi_message_init(&m); + spi_message_add_tail(&t[0], &m); + spi_message_add_tail(&t[1], &m); + + return spi_sync(spi, &m); +} + +static int tcan4x5x_regmap_write(void *context, const void *data, size_t count) +{ + u16 *reg = (u16 *)(data); + const u32 *val = data + 2; + + return regmap_spi_gather_write(context, reg, 2, val, count - 2); +} + +static int regmap_spi_async_write(void *context, + const void *reg, size_t reg_len, + const void *val, size_t val_len, + struct regmap_async *a) +{ + return -ENOTSUPP; +} + +static struct regmap_async *regmap_spi_async_alloc(void) +{ + return NULL; +} + +static int tcan4x5x_regmap_read(void *context, + const void *reg, size_t reg_size, + void *val, size_t val_size) +{ + struct device *dev = context; + struct spi_device *spi = to_spi_device(dev); + + u32 addr = TCAN4X5X_READ_CMD | (*((u16 *)reg) << 8) | val_size >> 2; + + return spi_write_then_read(spi, &addr, 4, val, val_size); +} + +static struct regmap_bus tcan4x5x_bus = { + .write = tcan4x5x_regmap_write, + .gather_write = regmap_spi_gather_write, + .async_write = regmap_spi_async_write, + .async_alloc = regmap_spi_async_alloc, + .read = tcan4x5x_regmap_read, + .read_flag_mask = 0x00, + .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, + .val_format_endian_default = REGMAP_ENDIAN_NATIVE, +}; + +static uint8_t tcan4x5x_dlc_conv(uint8_t input) +{ + const static u8 lookup[7] = {12, 16, 20, 24, 32, 48, 64}; + + if (input < 9) + return input; + + if (input < 16) + return lookup[(unsigned int)(input - 9)]; + + return 0; +} + +static uint8_t tcan4x5x_txrxesc_value(uint8_t input) +{ + const u8 lookup[8] = {8, 12, 16, 20, 24, 32, 48, 64}; + return lookup[(unsigned int)(input & 0x07)]; +} + +static void tcan4x5x_hw_tx(struct tcan4x5x_priv *tcan4x5x) +{ + u32 sid, eid, exide, rtr, brs, esi, fdf, xtd, data_len; + u32 mcan_address, mcan_tx_element_sz; + int queue_stat, queue_lvl, queue_idx; + struct canfd_frame *fd_frame; + struct can_frame *frame; + int tx_element_sz, i, temp; + canid_t frame_id; + u8 dlc_len; + + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXFQS, &queue_stat); + queue_lvl = queue_stat & TCAN4x5x_QUEUE_LVL_MASK; + queue_idx = (queue_stat & TCAN4x5x_QUEUE_IDX_MASK) >> TCAN4x5x_QUEUE_IDX_SHIFT; + + if (tcan4x5x->tx_skb->len == CAN_MTU) { + fd_frame = NULL; + frame = (struct can_frame *)tcan4x5x->tx_skb->data; + frame_id = frame->can_id; + dlc_len = frame->can_dlc; + data_len = ((dlc_len % 4) + dlc_len) / 4; + brs = 0; + } else if (tcan4x5x->tx_skb->len == CANFD_MTU) { + frame = NULL; + fd_frame = (struct canfd_frame *)tcan4x5x->tx_skb->data; + frame_id = fd_frame->can_id; + dlc_len = fd_frame->len; + data_len = ((dlc_len % 4) + dlc_len) / 4; + brs = fd_frame->flags & CANFD_BRS; + esi = fd_frame->flags & CANFD_ESI; + fdf = 1; + } else { + return; + } + + eid = frame_id & CAN_EFF_MASK; + rtr = (frame_id & CAN_RTR_FLAG) ? 1 : 0; + + exide = (frame_id & CAN_EFF_FLAG) ? 1 : 0; + if (exide) { + sid = frame_id & CAN_EFF_MASK; + xtd = 1; + } else { + sid = (frame_id & CAN_SFF_MASK) << TCAN4X5X_SID_SHIFT; + xtd = 0; + } + + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBC, &mcan_address); + + mcan_address = (mcan_address & 0xffff) + TCAN4X5X_MRAM_START; + temp = (uint8_t)((mcan_address >> 24) & 0x3F); + + tx_element_sz = temp > 32 ? 32 : temp; + temp = (uint8_t)((mcan_address >> 16) & 0x3F); + + tx_element_sz += temp > 32 ? 32 : temp; + mcan_address += ((uint32_t)tx_element_sz * queue_idx); + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXESC, &mcan_tx_element_sz); + tx_element_sz = tcan4x5x_txrxesc_value(mcan_tx_element_sz & 0x07) + 8; + mcan_address += ((uint32_t)tx_element_sz * 0); + + tx_element_sz = (tcan4x5x_dlc_conv(dlc_len & 0x0F) + 8) >> 2; + if (tcan4x5x_dlc_conv(dlc_len & 0x0F) % 4) + tx_element_sz += 1; + + tcan4x5x->spi_tx_buf[0] = esi << TCAN4X5X_ESI_SHIFT | + xtd << TCAN4X5X_XTD_SHIFT | + rtr << TCAN4X5X_RTR_SHIFT | sid; + + tcan4x5x->spi_tx_buf[1] = fdf << TCAN4X5X_FDF_SHIFT | + brs << TCAN4X5X_BRS_SHIFT | dlc_len << TCAN4X5X_DLC_SHIFT; + + if (tcan4x5x->tx_skb->len == CAN_MTU) + memcpy(tcan4x5x->spi_tx_buf + TCAN4X5X_DATA_PKT_OFF, + frame->data, dlc_len); + else + memcpy(tcan4x5x->spi_tx_buf + TCAN4X5X_DATA_PKT_OFF, + fd_frame->data, dlc_len); + + for (i = dlc_len + 1; i < TCAN4X5X_BUF_LEN / 4; i++) + tcan4x5x->spi_tx_buf[i] = 0; + + regmap_bulk_write(tcan4x5x->regmap, mcan_address, tcan4x5x->spi_tx_buf, + TCAN4X5X_BUF_LEN); + + regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBAR, (1 << (queue_idx))); +} + +int tcan4x5x_hw_rx(struct tcan4x5x_priv *tcan4x5x) +{ + u32 queue_idx, fifo_idx, fifo_start_addr, rx_buf_size, msg_type; + u32 data_buffer[TCAN4X5X_BUF_LEN] = {0x0}; + u32 rx_header[2] = {0x0}; + struct tcan4x5x_rx_regs *buffer_regs; + struct canfd_frame *fd_frame; + int dlc_len, data_len; + struct sk_buff *skb; + + skb = alloc_canfd_skb(tcan4x5x->net, &fd_frame); + if (!skb) { + dev_err(&tcan4x5x->spi->dev, "cannot allocate RX skb\n"); + tcan4x5x->net->stats.rx_dropped++; + return -ENOMEM; + } + + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, &msg_type); + if (msg_type & TCAN4X5X_RX_FIFO0_MESSAGE) { + buffer_regs = &tcan4x5x_fifo_regs[0]; + } else if (msg_type & TCAN4X5X_RX_FIFO1_MESSAGE) { + buffer_regs = &tcan4x5x_fifo_regs[1]; + } else if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) { + buffer_regs = &tcan4x5x_fifo_regs[2]; + } else { + buffer_regs = NULL; + return -EINVAL; + } + + rx_buf_size = TCAN4X5X_BUF_LEN; + + /* Determine which FIFO needs service */ + regmap_read(tcan4x5x->regmap, buffer_regs->fifo_status_reg, &fifo_idx); + if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) + queue_idx = fifo_idx - 1; + else + queue_idx = (TCAN4X5X_RX_INDEX_MASK & fifo_idx) >> TCAN4X5X_RX_INDEX_SHIFT; + + /* Calculate the FIFO start address to service */ + regmap_read(tcan4x5x->regmap, buffer_regs->fifo_config_reg, &fifo_start_addr); + fifo_start_addr = (TCAN4X5X_RX_ADDR_MASK & fifo_start_addr); + if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) + fifo_start_addr = fifo_start_addr + TCAN4X5X_RX_BUF_ADDR_OFFSET + + (rx_buf_size * queue_idx); + else + fifo_start_addr = fifo_start_addr + TCAN4X5X_RX_ADDR_OFFSET + + (rx_buf_size * queue_idx); + + regmap_bulk_read(tcan4x5x->regmap, fifo_start_addr, rx_header, 2); + + dlc_len = (rx_header[1] & TCAN4X5X_DLC_MASK) >> TCAN4X5X_DLC_SHIFT; + if (dlc_len <= 8) + data_len = dlc_len; + else + data_len = tcan4x5x_txrxesc_value(dlc_len); + + regmap_bulk_read(tcan4x5x->regmap, fifo_start_addr + 8, + data_buffer, data_len / 4); + + /* Acknowledge receipt of the data */ + regmap_write(tcan4x5x->regmap, buffer_regs->fifo_ack_reg, queue_idx); + + if (rx_header[0] & TCAN4X5X_XTD_MASK) { + fd_frame->can_id = CAN_EFF_FLAG; + fd_frame->can_id |= (rx_header[0] & CAN_EFF_MASK); + } else { + fd_frame->can_id |= ((rx_header[0] >> TCAN4X5X_SID_SHIFT) & + CAN_SFF_MASK); + } + + if (rx_header[0] & TCAN4X5X_RTR_MASK) + fd_frame->can_id |= CAN_RTR_FLAG; + + if (rx_header[0] & TCAN4X5X_ESI_MASK) { + fd_frame->can_id |= CAN_ERR_FLAG; + fd_frame->flags |= CANFD_ESI; + netdev_dbg(tcan4x5x->net, "ESI Error\n"); + } + + fd_frame->len = data_len; + memcpy(fd_frame->data, data_buffer, fd_frame->len); + + tcan4x5x->net->stats.rx_packets++; + tcan4x5x->net->stats.rx_bytes += fd_frame->len; + + can_led_event(tcan4x5x->net, CAN_LED_EVENT_RX); + netif_rx_ni(skb); + + return 0; +} + +static void tcan4x5x_sleep(struct spi_device *spi) +{ + struct tcan4x5x_priv *tcan4x5x = spi_get_drvdata(spi); + + regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_STANDBY); +} + +static int tcan4x5x_reset(struct net_device *net) +{ + struct tcan4x5x_priv *tcan4x5x = netdev_priv(net); + + if (tcan4x5x->reset_gpio) { + gpiod_set_value_cansleep(tcan4x5x->reset_gpio, 1); + udelay(10); + gpiod_set_value_cansleep(tcan4x5x->reset_gpio, 0); + } else { + regmap_write(tcan4x5x->regmap, TCAN4X5X_CONFIG, + TCAN4X5X_SW_RESET); + } + + return 0; +} + +static int tcan4x5x_power_enable(struct regulator *reg, int enable) +{ + if (IS_ERR_OR_NULL(reg)) + return 0; + + if (enable) + return regulator_enable(reg); + else + return regulator_disable(reg); +} + +static irqreturn_t tcan4x5x_can_ist(int irq, void *dev_id) +{ + struct tcan4x5x_priv *tcan4x5x = dev_id; + struct spi_device *spi = tcan4x5x->spi; + struct net_device *net = tcan4x5x->net; + enum can_state new_state; + int intf, eflag, mcan_intf; + + mutex_lock(&tcan4x5x->tcan4x5x_lock); + + regmap_read(tcan4x5x->regmap, TCAN4X5X_INT_FLAGS, &intf); + if (intf & TCAN4X5X_MCAN_INT) + tcan4x5x_hw_rx(tcan4x5x); + + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, &mcan_intf); + + regmap_read(tcan4x5x->regmap, TCAN4X5X_STATUS, &eflag); + /* Update can state */ + if (eflag & TCAN4X5X_MCAN_IR_BO) + new_state = CAN_STATE_BUS_OFF; + else if (eflag & TCAN4X5X_MCAN_IR_EP) + new_state = CAN_STATE_ERROR_PASSIVE; + else if (eflag & TCAN4X5X_MCAN_IR_EW) + new_state = CAN_STATE_ERROR_WARNING; + else + new_state = CAN_STATE_ERROR_ACTIVE; + + if (new_state != tcan4x5x->can.state) { + struct can_frame *cf; + struct sk_buff *skb; + enum can_state rx_state, tx_state; + u32 error_count; + + skb = alloc_can_err_skb(net, &cf); + if (!skb) + goto ist_out; + + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_ECR, &error_count); + cf->data[6] = error_count & 0xff; + cf->data[7] = error_count & 0x7f00 >> 8; + tx_state = cf->data[6] >= cf->data[7] ? new_state : 0; + rx_state = cf->data[6] <= cf->data[7] ? new_state : 0; + can_change_state(net, cf, tx_state, rx_state); + netif_rx_ni(skb); + + if (new_state == CAN_STATE_BUS_OFF) { + can_bus_off(net); + if (tcan4x5x->can.restart_ms == 0) { + tcan4x5x->force_quit = 1; + tcan4x5x_sleep(spi); + goto ist_out; + } + } + } + + /* Update bus errors */ + if ((intf & TCAN4X5X_BUS_FAULT) && + (tcan4x5x->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) { + struct can_frame *cf; + struct sk_buff *skb; + u32 psr_err, error_count; + + /* Check for protocol errors */ + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_PSR, &psr_err); + if (psr_err & TCAN4X5X_ERR_PROTOCOL_MASK) { + skb = alloc_can_err_skb(net, &cf); + if (!skb) + goto ist_out; + + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; + tcan4x5x->can.can_stats.bus_error++; + tcan4x5x->net->stats.rx_errors++; + if (psr_err & TCAN4X5X_ERR_BIT0ERR) + cf->data[2] |= CAN_ERR_PROT_BIT0; + else if (psr_err & TCAN4X5X_ERR_BIT1ERR) + cf->data[2] |= CAN_ERR_PROT_BIT1; + else if (psr_err & TCAN4X5X_ERR_FRMERR) + cf->data[2] |= CAN_ERR_PROT_FORM; + else if (psr_err & TCAN4X5X_ERR_STUFERR) + cf->data[2] |= CAN_ERR_PROT_STUFF; + else if (psr_err & TCAN4X5X_ERR_CRCERR) + cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; + else if (psr_err & TCAN4X5X_ERR_ACKERR) + cf->data[3] |= CAN_ERR_PROT_LOC_ACK; + + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_ECR, + &error_count); + cf->data[6] = error_count & 0xff; + cf->data[7] = error_count & 0x7f00 >> 8; + netdev_dbg(tcan4x5x->net, "Bus Error\n"); + netif_rx_ni(skb); + } + } + + if (mcan_intf & TCAN4X5X_MCAN_IR_TC) { + net->stats.tx_packets++; + net->stats.tx_bytes += tcan4x5x->tx_len - 1; + can_led_event(net, CAN_LED_EVENT_TX); + if (tcan4x5x->tx_len) { + can_get_echo_skb(net, 0); + tcan4x5x->tx_len = 0; + } + netif_wake_queue(net); + } + +ist_out: + regmap_write(tcan4x5x->regmap, TCAN4X5X_INT_FLAGS, TCAN4X5X_CLEAR_ALL_INT); + regmap_write(tcan4x5x->regmap, TCAN4X5X_STATUS, TCAN4X5X_CLEAR_ALL_INT); + regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, + TCAN4X5X_CLEAR_ALL_INT); + + mutex_unlock(&tcan4x5x->tcan4x5x_lock); + return IRQ_HANDLED; +} + +static int tcan4x5x_do_set_bittiming(struct net_device *net) +{ + struct tcan4x5x_priv *priv = netdev_priv(net); + struct can_bittiming *bt = &priv->can.bittiming; + struct can_bittiming *dbt = &priv->can.data_bittiming; + u16 brp, sjw, tseg1, tseg2; + int ret; + u32 val; + + brp = bt->brp - 1; + sjw = bt->sjw - 1; + tseg1 = bt->prop_seg + bt->phase_seg1 - 1; + tseg2 = bt->phase_seg2 - 1; + val = (brp << TCAN4X5X_NBRP_SHIFT) | (sjw << TCAN4X5X_NSJW_SHIFT) | + (tseg1 << TCAN4X5X_NTSEG1_SHIFT) | tseg2; + + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_NBTP, val); + if (ret) + return -EIO; + + if (priv->can.ctrlmode & CAN_CTRLMODE_FD) { + val = 0; + brp = dbt->brp - 1; + sjw = dbt->sjw - 1; + tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1; + tseg2 = dbt->phase_seg2 - 1; + + /* TDC is only needed for bitrates beyond 2.5 MBit/s. + * This is mentioned in the "Bit Time Requirements for CAN FD" + * paper presented at the International CAN Conference 2013 + */ + if (dbt->bitrate > 2500000) { + u32 tdco, ssp; + + /* Use the same value of secondary sampling point + * as the data sampling point + */ + ssp = dbt->sample_point; + + /* Equation based on Bosch's M_CAN User Manual's + * Transmitter Delay Compensation Section + */ + tdco = (priv->can.clock.freq / 1000) * + ssp / dbt->bitrate; + + /* Max valid TDCO value is 127 */ + if (tdco > 127) { + netdev_warn(net, "TDCO value of %u is beyond maximum. Using maximum possible value\n", + tdco); + tdco = 127; + } + + val |= DBTP_TDC; + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_TDCR, + tdco << TCAN4X5X_TDCR_TDCO_SHIFT); + if (ret) + return -EIO; + } + + val |= (brp << DBTP_DBRP_SHIFT) | + (sjw << DBTP_DSJW_SHIFT) | + (tseg1 << DBTP_DTSEG1_SHIFT) | + (tseg2 << DBTP_DTSEG2_SHIFT); + + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_DBTP, val); + } + + return ret; +} + +static int tcan4x5x_setup(struct spi_device *spi) +{ + struct tcan4x5x_priv *tcan4x5x = spi_get_drvdata(spi); + int start_reg = TCAN4X5X_MRAM_START; + int end_reg = start_reg + TCAN4X5X_MRAM_SIZE; + int ret; + + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_REG, + TCAN4X5X_CLEAR_ALL_INT); + if (ret) + return -EIO; + + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_EN, + TCAN4X5X_ENABLE_MCAN_INT); + if (ret) + return -EIO; + + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_CCCR, + TCAN4X5X_CCCR_INIT | TCAN4X5X_CCCR_CCE); + if (ret) + return -EIO; + + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_CCCR, + TCAN4X5X_CCCR_INIT | TCAN4X5X_CCCR_CCE | + TCAN4X5X_CCCR_FDOE | TCAN4X5X_CCCR_BRSE); + if (ret) + return -EIO; + + ret = tcan4x5x_do_set_bittiming(tcan4x5x->net); + if (ret) + return -EIO; + + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXESC, + TCAN4X5X_64_BYTE); + if (ret) + return -EIO; + + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBC, + (TCAN4X5X_NUM_TX_BUF << TCAN4X5X_TX_QUEUE_SHIFT | + TCAN4X5X_TX_BUF_START)); + if (ret) + return -EIO; + + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_RXF0C, + (TCAN4X5X_RX_WATER_MARK << TCAN4X5X_RX_WATER_MARK_SHIFT | + TCAN4X5X_NUM_RX_BUF << TCAN4X5X_RX_FIFO_SZ_SHIFT | + TCAN4X5X_RX_BUF_START)); + if (ret) + return -EIO; + + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_RXESC, + (TCAN4X5X_64_BYTE << TCAN4X5X_RX_RBDS_SHIFT | + TCAN4X5X_64_BYTE << TCAN4X5X_RX_F1DS_SHIFT | + TCAN4X5X_64_BYTE)); + if (ret) + return -EIO; + + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBTIE, + TCAN4X5X_SET_ALL_INT); + if (ret) + return -EIO; + + + ret = regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_NORMAL); + if (ret) + return -EIO; + + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_ILE, TCAN4X5X_EINT0); + if (ret) + return -EIO; + + /* Zero out the MCAN buffers */ + while (start_reg < end_reg) { + regmap_write(tcan4x5x->regmap, start_reg, 0); + start_reg += 4; + } + + return ret; +} + +static void tcan4x5x_tx_work_handler(struct work_struct *ws) +{ + struct tcan4x5x_priv *tcan4x5x = container_of(ws, struct tcan4x5x_priv, + tx_work); + struct net_device *net = tcan4x5x->net; + struct can_frame *frame; + + mutex_lock(&tcan4x5x->tcan4x5x_lock); + if (tcan4x5x->tx_skb) { + if (tcan4x5x->can.state == CAN_STATE_BUS_OFF) { + tcan4x5x_clean(net); + } else { + frame = (struct can_frame *)tcan4x5x->tx_skb->data; + tcan4x5x_hw_tx(tcan4x5x); + tcan4x5x->tx_len = 1 + frame->can_dlc; + can_put_echo_skb(tcan4x5x->tx_skb, net, 0); + tcan4x5x->tx_skb = NULL; + } + } + mutex_unlock(&tcan4x5x->tcan4x5x_lock); +} + +static void tcan4x5x_restart_work_handler(struct work_struct *ws) +{ + struct tcan4x5x_priv *tcan4x5x = container_of(ws, struct tcan4x5x_priv, + restart_work); + struct spi_device *spi = tcan4x5x->spi; + struct net_device *net = tcan4x5x->net; + + mutex_lock(&tcan4x5x->tcan4x5x_lock); + if (tcan4x5x->after_suspend) { + tcan4x5x_reset(net); + tcan4x5x_setup(spi); + if (tcan4x5x->after_suspend & AFTER_SUSPEND_RESTART) { + tcan4x5x_setup(spi); + } else if (tcan4x5x->after_suspend & AFTER_SUSPEND_UP) { + netif_device_attach(net); + tcan4x5x_clean(net); + tcan4x5x_setup(spi); + netif_wake_queue(net); + } else { + tcan4x5x_sleep(spi); + } + tcan4x5x->after_suspend = 0; + tcan4x5x->force_quit = 0; + } + + if (tcan4x5x->restart_tx) { + tcan4x5x->restart_tx = 0; + tcan4x5x_reset(net); + tcan4x5x_clean(net); + tcan4x5x_setup(spi); + netif_wake_queue(net); + } + mutex_unlock(&tcan4x5x->tcan4x5x_lock); +} + +static int tcan4x5x_open(struct net_device *net) +{ + struct tcan4x5x_priv *priv = netdev_priv(net); + struct spi_device *spi = priv->spi; + unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_LOW; + int ret; + + ret = open_candev(net); + if (ret) + return ret; + + mutex_lock(&priv->tcan4x5x_lock); + tcan4x5x_power_enable(priv->power, 1); + + priv->force_quit = 0; + priv->tx_skb = NULL; + priv->tx_len = 0; + + ret = request_threaded_irq(priv->irq, NULL, tcan4x5x_can_ist, + flags, DEVICE_NAME, priv); + if (ret) { + dev_err(&spi->dev, "failed to acquire irq %d %i\n", + priv->irq, ret); + goto out_close; + } + + priv->wq = alloc_workqueue("tcan4x5x_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM, + 0); + if (!priv->wq) { + ret = -ENOMEM; + goto out_free_irq; + } + + INIT_WORK(&priv->tx_work, tcan4x5x_tx_work_handler); + INIT_WORK(&priv->restart_work, tcan4x5x_restart_work_handler); + + priv->spi_tx_buf = devm_kzalloc(&spi->dev, TCAN4X5X_BUF_LEN, + GFP_KERNEL); + if (!priv->spi_tx_buf) { + ret = -ENOMEM; + goto out_free_wq; + } + + priv->spi_rx_buf = devm_kzalloc(&spi->dev, TCAN4X5X_BUF_LEN, + GFP_KERNEL); + if (!priv->spi_rx_buf) { + ret = -ENOMEM; + goto out_free_wq; + } + + if (priv->wake_gpio) + gpiod_set_value_cansleep(priv->wake_gpio, 1); + + ret = tcan4x5x_reset(net); + if (ret) + goto out_free_wq; + + ret = tcan4x5x_setup(spi); + if (ret) + goto out_free_wq; + + can_led_event(net, CAN_LED_EVENT_OPEN); + netif_wake_queue(net); + mutex_unlock(&priv->tcan4x5x_lock); + + return 0; + + out_free_wq: + destroy_workqueue(priv->wq); + out_free_irq: + free_irq(priv->irq, priv); + tcan4x5x_sleep(spi); + out_close: + tcan4x5x_power_enable(priv->power, 0); + close_candev(net); + mutex_unlock(&priv->tcan4x5x_lock); + return ret; +} + +static int tcan4x5x_stop(struct net_device *net) +{ + struct tcan4x5x_priv *priv = netdev_priv(net); + struct spi_device *spi = priv->spi; + + close_candev(net); + + priv->force_quit = 1; + free_irq(priv->irq, priv); + destroy_workqueue(priv->wq); + priv->wq = NULL; + + mutex_lock(&priv->tcan4x5x_lock); + + priv->can.state = CAN_STATE_STOPPED; + tcan4x5x_sleep(spi); + tcan4x5x_power_enable(priv->power, 0); + + mutex_unlock(&priv->tcan4x5x_lock); + + can_led_event(net, CAN_LED_EVENT_STOP); + + return 0; +} + +static netdev_tx_t tcan4x5x_hard_start_xmit(struct sk_buff *skb, + struct net_device *net) +{ + struct tcan4x5x_priv *priv = netdev_priv(net); + struct spi_device *spi = priv->spi; + + if (priv->tx_skb || priv->tx_len) { + dev_warn(&spi->dev, "hard_xmit called while tx busy\n"); + return NETDEV_TX_BUSY; + } + + if (can_dropped_invalid_skb(net, skb)) + return NETDEV_TX_OK; + + netif_stop_queue(net); + priv->tx_skb = skb; + queue_work(priv->wq, &priv->tx_work); + + return NETDEV_TX_OK; +} + +static int tcan4x5x_do_set_mode(struct net_device *net, enum can_mode mode) +{ + struct tcan4x5x_priv *priv = netdev_priv(net); + + switch (mode) { + case CAN_MODE_START: + tcan4x5x_clean(net); + priv->can.state = CAN_STATE_ERROR_ACTIVE; + priv->restart_tx = 1; + queue_work(priv->wq, &priv->restart_work); + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static const struct net_device_ops tcan4x5x_netdev_ops = { + .ndo_open = tcan4x5x_open, + .ndo_stop = tcan4x5x_stop, + .ndo_start_xmit = tcan4x5x_hard_start_xmit, + .ndo_change_mtu = can_change_mtu, +}; + +static int tcan4x5x_parse_config(struct tcan4x5x_priv *tcan4x5x) +{ + tcan4x5x->reset_gpio = devm_gpiod_get_optional(&tcan4x5x->spi->dev, + "reset", GPIOD_OUT_LOW); + if (IS_ERR(tcan4x5x->reset_gpio)) + tcan4x5x->reset_gpio = NULL; + + tcan4x5x->wake_gpio = devm_gpiod_get_optional(&tcan4x5x->spi->dev, + "wake-up", GPIOD_OUT_LOW); + if (IS_ERR(tcan4x5x->wake_gpio)) + tcan4x5x->wake_gpio = NULL; + + tcan4x5x->interrupt_gpio = devm_gpiod_get(&tcan4x5x->spi->dev, + "data-ready", GPIOD_IN); + if (IS_ERR(tcan4x5x->interrupt_gpio)) { + dev_err(&tcan4x5x->spi->dev, "data-ready gpio not defined\n"); + return -EINVAL; + } + + tcan4x5x->irq = gpiod_to_irq(tcan4x5x->interrupt_gpio); + + tcan4x5x->power = devm_regulator_get_optional(&tcan4x5x->spi->dev, + "vsup"); + if (PTR_ERR(tcan4x5x->power) == -EPROBE_DEFER) + return -EPROBE_DEFER; + + return 0; +} + +static const struct regmap_config tcan4x5x_regmap = { + .reg_bits = 16, + .val_bits = 32, + .cache_type = REGCACHE_NONE, + .max_register = TCAN4X5X_MAX_REGISTER, +}; + +static int tcan4x5x_can_probe(struct spi_device *spi) +{ + struct net_device *net; + struct tcan4x5x_priv *priv; + struct clk *clk; + int freq, ret; + + clk = devm_clk_get(&spi->dev, NULL); + if (IS_ERR(clk)) { + dev_err(&spi->dev, "no CAN clock source defined\n"); + freq = TCAN4X5X_EXT_CLK_DEF; + } else { + freq = clk_get_rate(clk); + } + + /* Sanity check */ + if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF) + return -ERANGE; + + /* Allocate can/net device */ + net = alloc_candev(sizeof(*priv), TCAN4X5X_TX_ECHO_SKB_MAX); + if (!net) + return -ENOMEM; + + if (!IS_ERR(clk)) { + ret = clk_prepare_enable(clk); + if (ret) + goto out_free; + } + + net->netdev_ops = &tcan4x5x_netdev_ops; + net->flags |= IFF_ECHO; + net->mtu = CANFD_MTU; + + priv = netdev_priv(net); + priv->can.bittiming_const = &tcan4x5x_bittiming_const; + priv->can.data_bittiming_const = &tcan4x5x_data_bittiming_const; + priv->can.do_set_mode = tcan4x5x_do_set_mode; + priv->can.clock.freq = freq; + priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | + CAN_CTRLMODE_LISTENONLY | + CAN_CTRLMODE_BERR_REPORTING | + CAN_CTRLMODE_FD | + CAN_CTRLMODE_FD_NON_ISO; + priv->net = net; + priv->spi = spi; + priv->clk = clk; + spi_set_drvdata(spi, priv); + + ret = tcan4x5x_parse_config(priv); + if (ret) + goto out_clk; + + /* Configure the SPI bus */ + spi->bits_per_word = 32; + ret = spi_setup(spi); + if (ret) + goto out_clk; + + mutex_init(&priv->tcan4x5x_lock); + + priv->regmap = devm_regmap_init(&spi->dev, &tcan4x5x_bus, + &spi->dev, &tcan4x5x_regmap); + + SET_NETDEV_DEV(net, &spi->dev); + ret = register_candev(net); + if (ret) + goto error_probe; + + devm_can_led_init(net); + + netdev_info(net, "TCAN4X5X successfully initialized.\n"); + return 0; + +error_probe: + tcan4x5x_power_enable(priv->power, 0); +out_clk: + if (!IS_ERR(clk)) + clk_disable_unprepare(clk); +out_free: + free_candev(net); + dev_err(&spi->dev, "Probe failed, err=%d\n", -ret); + return ret; +} + +static int tcan4x5x_can_remove(struct spi_device *spi) +{ + struct tcan4x5x_priv *priv = spi_get_drvdata(spi); + struct net_device *net = priv->net; + + unregister_candev(net); + + tcan4x5x_power_enable(priv->power, 0); + + if (!IS_ERR(priv->clk)) + clk_disable_unprepare(priv->clk); + + free_candev(net); + + return 0; +} + +static const struct of_device_id tcan4x5x_of_match[] = { + { .compatible = "ti,tcan4x5x", }, + { } +}; +MODULE_DEVICE_TABLE(of, tcan4x5x_of_match); + +static const struct spi_device_id tcan4x5x_id_table[] = { + { + .name = "tcan4x5x", + .driver_data = 0, + }, + { } +}; +MODULE_DEVICE_TABLE(spi, tcan4x5x_id_table); + +static struct spi_driver tcan4x5x_can_driver = { + .driver = { + .name = DEVICE_NAME, + .of_match_table = tcan4x5x_of_match, + .pm = NULL, + }, + .id_table = tcan4x5x_id_table, + .probe = tcan4x5x_can_probe, + .remove = tcan4x5x_can_remove, +}; +module_spi_driver(tcan4x5x_can_driver); + +MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); +MODULE_DESCRIPTION("Texas Instruments TCAN4x5x CAN driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/net/can/spi/tcan4x5x.h b/drivers/net/can/spi/tcan4x5x.h new file mode 100644 index 000000000000..5e14ba571d49 --- /dev/null +++ b/drivers/net/can/spi/tcan4x5x.h @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0 +// SPI to CAN driver for the Texas Instruments TCA4x5x +// Flash driver chip family +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ + +#define TCAN4X5X_DEV_ID0 0x00 +#define TCAN4X5X_DEV_ID1 0x04 +#define TCAN4X5X_REV 0x08 +#define TCAN4X5X_STATUS 0x0C +#define TCAN4X5X_ERROR_STATUS 0x10 +#define TCAN4X5X_CONTROL 0x14 + +#define TCAN4X5X_CONFIG 0x800 +#define TCAN4X5X_TS_PRESCALE 0x804 +#define TCAN4X5X_TEST_REG 0x808 +#define TCAN4X5X_INT_FLAGS 0x820 +#define TCAN4X5X_MCAN_INT_REG 0x824 +#define TCAN4X5X_INT_EN 0x830 + +#define TCAN4X5X_MCAN_CREL 0x1000 +#define TCAN4X5X_MCAN_ENDN 0x1004 +#define TCAN4X5X_MCAN_CUST 0x1008 +#define TCAN4X5X_MCAN_DBTP 0x100C +#define TCAN4X5X_MCAN_TEST 0x1010 +#define TCAN4X5X_MCAN_RWD 0x1014 +#define TCAN4X5X_MCAN_CCCR 0x1018 +#define TCAN4X5X_MCAN_NBTP 0x101C +#define TCAN4X5X_MCAN_TSCC 0x1020 +#define TCAN4X5X_MCAN_TSCV 0x1024 +#define TCAN4X5X_MCAN_TOCC 0x1028 +#define TCAN4X5X_MCAN_TOCV 0x102C +#define TCAN4X5X_MCAN_ECR 0x1040 +#define TCAN4X5X_MCAN_PSR 0x1044 +#define TCAN4X5X_MCAN_TDCR 0x1048 +#define TCAN4X5X_MCAN_INT_FLAG 0x1050 +#define TCAN4X5X_MCAN_INT_EN 0x1054 +#define TCAN4X5X_MCAN_ILS 0x1058 +#define TCAN4X5X_MCAN_ILE 0x105C +#define TCAN4X5X_MCAN_GFC 0x1080 +#define TCAN4X5X_MCAN_SIDFC 0x1084 +#define TCAN4X5X_MCAN_XIDFC 0x1088 +#define TCAN4X5X_MCAN_XIDAM 0x1090 +#define TCAN4X5X_MCAN_HPMS 0x1094 +#define TCAN4X5X_MCAN_NDAT1 0x1098 +#define TCAN4X5X_MCAN_NDAT2 0x109C +#define TCAN4X5X_MCAN_RXF0C 0x10A0 +#define TCAN4X5X_MCAN_RXF0S 0x10A4 +#define TCAN4X5X_MCAN_RXF0A 0x10A8 +#define TCAN4X5X_MCAN_RXBC 0x10AC +#define TCAN4X5X_MCAN_RXF1C 0x10B0 +#define TCAN4X5X_MCAN_RXF1S 0x10B4 +#define TCAN4X5X_MCAN_RXF1A 0x10B8 +#define TCAN4X5X_MCAN_RXESC 0x10BC +#define TCAN4X5X_MCAN_TXBC 0x10C0 +#define TCAN4X5X_MCAN_TXFQS 0x10C4 +#define TCAN4X5X_MCAN_TXESC 0x10C8 +#define TCAN4X5X_MCAN_TXBRP 0x10CC +#define TCAN4X5X_MCAN_TXBAR 0x10D0 +#define TCAN4X5X_MCAN_TXBCR 0x10D4 +#define TCAN4X5X_MCAN_TXBTO 0x10D8 +#define TCAN4X5X_MCAN_TXBCF 0x10DC +#define TCAN4X5X_MCAN_TXBTIE 0x10E0 +#define TCAN4X5X_MCAN_TXBCIE 0x10E4 +#define TCAN4X5X_MCAN_TXEFC 0x10F0 +#define TCAN4X5X_MCAN_TXEFS 0x10F4 +#define TCAN4X5X_MCAN_TXEFA 0x10F8 + +#define TCAN4X5X_MRAM_START 0x8000 +#define TCAN4X5X_MRAM_SIZE 2048 + +#define TCAN4X5X_MAX_REGISTER 0x8fff + +/* 64 byte buffer + 8 byte MCAN header */ +#define TCAN4X5X_BUF_LEN 72 + +struct tcan4x5x_priv { + struct can_priv can; + struct net_device *net; + struct regmap *regmap; + struct spi_device *spi; + + struct mutex tcan4x5x_lock; /* SPI device lock */ + + struct gpio_desc *reset_gpio; + struct gpio_desc *interrupt_gpio; + struct gpio_desc *wake_gpio; + struct regulator *power; + struct clk *clk; + + struct sk_buff *tx_skb; + int tx_len; + + struct workqueue_struct *wq; + struct work_struct tx_work; + struct work_struct restart_work; + + u32 *spi_tx_buf; + u32 *spi_rx_buf; + + int force_quit; + int after_suspend; +#define AFTER_SUSPEND_UP 1 +#define AFTER_SUSPEND_DOWN 2 +#define AFTER_SUSPEND_POWER 4 +#define AFTER_SUSPEND_RESTART 8 + int restart_tx; + + int irq; +}; -- 2.17.0.1855.g63749b2dea ^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel 2018-09-10 20:12 ` [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel Dan Murphy @ 2018-09-26 17:40 ` Dan Murphy 2018-09-26 17:54 ` Wolfgang Grandegger 0 siblings, 1 reply; 10+ messages in thread From: Dan Murphy @ 2018-09-26 17:40 UTC (permalink / raw) To: wg, mkl, davem; +Cc: linux-can, netdev, linux-kernel bump On 09/10/2018 03:12 PM, Dan Murphy wrote: > Add the TCAN4x5x SPI CAN driver. This device > uses the Bosch MCAN IP core along with a SPI > interface map. The register and data are > 32 bits wide. > > Signed-off-by: Dan Murphy <dmurphy@ti.com> > --- > drivers/net/can/spi/Kconfig | 5 + > drivers/net/can/spi/Makefile | 1 + > drivers/net/can/spi/tcan4x5x.c | 1206 ++++++++++++++++++++++++++++++++ > drivers/net/can/spi/tcan4x5x.h | 109 +++ > 4 files changed, 1321 insertions(+) > create mode 100644 drivers/net/can/spi/tcan4x5x.c > create mode 100644 drivers/net/can/spi/tcan4x5x.h > > diff --git a/drivers/net/can/spi/Kconfig b/drivers/net/can/spi/Kconfig > index 8f2e0dd7b756..8cac6ce37506 100644 > --- a/drivers/net/can/spi/Kconfig > +++ b/drivers/net/can/spi/Kconfig > @@ -13,4 +13,9 @@ config CAN_MCP251X > ---help--- > Driver for the Microchip MCP251x SPI CAN controllers. > > +config CAN_TCAN4X5X > + tristate "Texas Instruments TCAN4X5X SPI CAN controllers" > + depends on HAS_DMA > + ---help--- > + Driver for the Texas Instruments TCAN4X5X SPI CAN controllers. > endmenu > diff --git a/drivers/net/can/spi/Makefile b/drivers/net/can/spi/Makefile > index f59fa3731073..8ecaace7a920 100644 > --- a/drivers/net/can/spi/Makefile > +++ b/drivers/net/can/spi/Makefile > @@ -5,3 +5,4 @@ > > obj-$(CONFIG_CAN_HI311X) += hi311x.o > obj-$(CONFIG_CAN_MCP251X) += mcp251x.o > +obj-$(CONFIG_CAN_TCAN4X5X) += tcan4x5x.o > diff --git a/drivers/net/can/spi/tcan4x5x.c b/drivers/net/can/spi/tcan4x5x.c > new file mode 100644 > index 000000000000..ca3753efe35a > --- /dev/null > +++ b/drivers/net/can/spi/tcan4x5x.c > @@ -0,0 +1,1206 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// SPI to CAN driver for the Texas Instruments TCAN4x5x > +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ > + > +#include <linux/can/core.h> > +#include <linux/can/dev.h> > +#include <linux/can/led.h> > +#include <linux/clk.h> > +#include <linux/completion.h> > +#include <linux/delay.h> > +#include <linux/device.h> > +#include <linux/dma-mapping.h> > +#include <linux/freezer.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/netdevice.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > +#include <linux/regmap.h> > +#include <linux/slab.h> > +#include <linux/spi/spi.h> > +#include <linux/uaccess.h> > + > +#include <linux/regulator/consumer.h> > +#include <linux/gpio/consumer.h> > + > +#include "tcan4x5x.h" > + > +#define DEVICE_NAME "tcan4x5x" > +#define TCAN4X5X_EXT_CLK_DEF 40000000 > + > +#define TCAN4X5X_CLEAR_ALL_INT 0xffffffff > +#define TCAN4X5X_SET_ALL_INT 0xffffffff > + > +#define TCAN4X5X_TX_ECHO_SKB_MAX 1 > +#define TCAN4X5X_DATA_PKT_OFF 2 > +#define TCAN4X5X_WRITE_CMD (0x61 << 24) > +#define TCAN4X5X_READ_CMD (0x41 << 24) > + > +#define TCAN4X5X_SID_SHIFT 18 > +#define TCAN4X5X_DLC_SHIFT 16 > + > +#define TCAN4X5X_ESI_SHIFT 31 > +#define TCAN4X5X_XTD_SHIFT 30 > +#define TCAN4X5X_RTR_SHIFT 29 > +#define TCAN4X5X_FDF_SHIFT 21 > +#define TCAN4X5X_BRS_SHIFT 20 > +#define TCAN4X5X_DLC_SHIFT 16 > + > +#define TCAN4X5X_ESI_MASK BIT(31) > +#define TCAN4X5X_XTD_MASK BIT(30) > +#define TCAN4X5X_RTR_MASK BIT(29) > + > +#define TCAN4X5X_DLC_MASK 0xf0000 > +#define TCAN4X5X_SW_RESET BIT(2) > + > +#define TCAN4X5X_MODE_SEL_MASK (BIT(7) | BIT(6)) > +#define TCAN4X5X_MODE_SLEEP 0x00 > +#define TCAN4X5X_MODE_STANDBY BIT(6) > +#define TCAN4X5X_MODE_NORMAL BIT(7) > +#define TCAN4X5X_MCAN_CONFIGURED BIT(5) > +#define TCAN4X5X_WATCHDOG_EN BIT(3) > +#define TCAN4X5X_WD_60_MS_TIMER 0 > +#define TCAN4X5X_WD_600_MS_TIMER BIT(28) > +#define TCAN4X5X_WD_3_S_TIMER BIT(29) > +#define TCAN4X5X_WD_6_S_TIMER (BIT(28) | BIT(29)) > + > +/* Nominal Bit Timing & Prescaler Register */ > +#define TCAN4X5X_NSJW_SHIFT 25 > +#define TCAN4X5X_NBRP_SHIFT 16 > +#define TCAN4X5X_NTSEG1_SHIFT 8 > + > +#define TCAN4X5X_TDCR_TDCO_SHIFT 8 > + > +/* Data Bit Timing & Prescaler Register (DBTP) */ > +#define DBTP_TDC BIT(23) > +#define DBTP_DBRP_SHIFT 16 > +#define DBTP_DBRP_MASK (0x1f << DBTP_DBRP_SHIFT) > +#define DBTP_DTSEG1_SHIFT 8 > +#define DBTP_DTSEG1_MASK (0x1f << DBTP_DTSEG1_SHIFT) > +#define DBTP_DTSEG2_SHIFT 4 > +#define DBTP_DTSEG2_MASK (0xf << DBTP_DTSEG2_SHIFT) > +#define DBTP_DSJW_SHIFT 0 > +#define DBTP_DSJW_MASK (0xf << DBTP_DSJW_SHIFT) > + > +#define TCAN4x5x_QUEUE_LVL_MASK 0x1f > +#define TCAN4x5x_QUEUE_IDX_SHIFT 16 > +#define TCAN4x5x_QUEUE_IDX_MASK 0x1f00 > + > +#define TCAN4X5X_CANBUSNOM_INT_EN BIT(14) > + > +#define TCAN4X5X_NUM_TX_BUF 5 > +#define TCAN4X5X_TX_QUEUE_SHIFT 24 > +#define TCAN4X5X_TX_NDTB_SHIFT 16 > +#define TCAN4X5X_TX_BUF_START 0x324 > + > +#define TCAN4X5X_NUM_RX_BUF 3 > +#define TCAN4X5X_RX_WATER_MARK 2 > +#define TCAN4X5X_RX_WATER_MARK_SHIFT 24 > +#define TCAN4X5X_RX_FIFO_SZ_SHIFT 16 > +#define TCAN4X5X_RX_BUF_START 0x4 > + > +#define TCAN4X5X_RX_F1DS_SHIFT 4 > +#define TCAN4X5X_RX_RBDS_SHIFT 8 > + > +#define TCAN4X5X_RX_FIFO0_MESSAGE BIT(0) > +#define TCAN4X5X_RX_FIFO1_MESSAGE BIT(4) > +#define TCAN4X5X_RX_BUFFER_MESSAGE BIT(19) > +#define TCAN4X5X_RX_INDEX_MASK 0x3f00 > +#define TCAN4X5X_RX_INDEX_SHIFT 8 > + > +#define TCAN4X5X_RX_ADDR_OFFSET 0x8000 > +#define TCAN4X5X_RX_BUF_ADDR_OFFSET 0x8100 > +#define TCAN4X5X_RX_ADDR_MASK 0xffff > + > +#define TCAN4X5X_ERR_PROTOCOL_MASK 0x7 > +#define TCAN4X5X_ERR_STUFERR 0x1 > +#define TCAN4X5X_ERR_FRMERR 0x2 > +#define TCAN4X5X_ERR_ACKERR 0x3 > +#define TCAN4X5X_ERR_BIT1ERR 0x4 > +#define TCAN4X5X_ERR_BIT0ERR 0x5 > +#define TCAN4X5X_ERR_CRCERR 0x6 > + > +/* Interrupt bits */ > +#define TCAN4X5X_CANBUSTERMOPEN_INT_EN BIT(30) > +#define TCAN4X5X_CANHCANL_INT_EN BIT(29) > +#define TCAN4X5X_CANHBAT_INT_EN BIT(28) > +#define TCAN4X5X_CANLGND_INT_EN BIT(27) > +#define TCAN4X5X_CANBUSOPEN_INT_EN BIT(26) > +#define TCAN4X5X_CANBUSGND_INT_EN BIT(25) > +#define TCAN4X5X_CANBUSBAT_INT_EN BIT(24) > +#define TCAN4X5X_UVSUP_INT_EN BIT(22) > +#define TCAN4X5X_UVIO_INT_EN BIT(21) > +#define TCAN4X5X_TSD_INT_EN BIT(19) > +#define TCAN4X5X_ECCERR_INT_EN BIT(16) > +#define TCAN4X5X_CANINT_INT_EN BIT(15) > +#define TCAN4X5X_LWU_INT_EN BIT(14) > +#define TCAN4X5X_CANSLNT_INT_EN BIT(10) > +#define TCAN4X5X_CANDOM_INT_EN BIT(8) > +#define TCAN4X5X_CANBUS_ERR_INT_EN BIT(5) > +#define TCAN4X5X_BUS_FAULT BIT(4) > +#define TCAN4X5X_MCAN_INT BIT(1) > +#define TCAN4X5X_ENABLE_ALL_INT (TCAN4X5X_MCAN_INT | \ > + TCAN4X5X_BUS_FAULT | \ > + TCAN4X5X_CANBUS_ERR_INT_EN | \ > + TCAN4X5X_CANINT_INT_EN) > + > +/* MCAN Interrupt bits */ > +#define TCAN4X5X_MCAN_IR_ARA BIT(29) > +#define TCAN4X5X_MCAN_IR_PED BIT(28) > +#define TCAN4X5X_MCAN_IR_PEA BIT(27) > +#define TCAN4X5X_MCAN_IR_WD BIT(26) > +#define TCAN4X5X_MCAN_IR_BO BIT(25) > +#define TCAN4X5X_MCAN_IR_EW BIT(24) > +#define TCAN4X5X_MCAN_IR_EP BIT(23) > +#define TCAN4X5X_MCAN_IR_ELO BIT(22) > +#define TCAN4X5X_MCAN_IR_BEU BIT(21) > +#define TCAN4X5X_MCAN_IR_BEC BIT(20) > +#define TCAN4X5X_MCAN_IR_DRX BIT(19) > +#define TCAN4X5X_MCAN_IR_TOO BIT(18) > +#define TCAN4X5X_MCAN_IR_MRAF BIT(17) > +#define TCAN4X5X_MCAN_IR_TSW BIT(16) > +#define TCAN4X5X_MCAN_IR_TEFL BIT(15) > +#define TCAN4X5X_MCAN_IR_TEFF BIT(14) > +#define TCAN4X5X_MCAN_IR_TEFW BIT(13) > +#define TCAN4X5X_MCAN_IR_TEFN BIT(12) > +#define TCAN4X5X_MCAN_IR_TFE BIT(11) > +#define TCAN4X5X_MCAN_IR_TCF BIT(10) > +#define TCAN4X5X_MCAN_IR_TC BIT(9) > +#define TCAN4X5X_MCAN_IR_HPM BIT(8) > +#define TCAN4X5X_MCAN_IR_RF1L BIT(7) > +#define TCAN4X5X_MCAN_IR_RF1F BIT(6) > +#define TCAN4X5X_MCAN_IR_RF1W BIT(5) > +#define TCAN4X5X_MCAN_IR_RF1N BIT(4) > +#define TCAN4X5X_MCAN_IR_RF0L BIT(3) > +#define TCAN4X5X_MCAN_IR_RF0F BIT(2) > +#define TCAN4X5X_MCAN_IR_RF0W BIT(1) > +#define TCAN4X5X_MCAN_IR_RF0N BIT(0) > +#define TCAN4X5X_ENABLE_MCAN_INT (TCAN4X5X_MCAN_IR_TC | \ > + TCAN4X5X_MCAN_IR_RF0N | \ > + TCAN4X5X_MCAN_IR_RF1N | \ > + TCAN4X5X_MCAN_IR_RF0F | \ > + TCAN4X5X_MCAN_IR_RF1F) > + > +/* CCR bits */ > +#define TCAN4X5X_CCCR_NISO_BOSCH BIT(15) > +#define TCAN4X5X_CCCR_TXP BIT(15) > +#define TCAN4X5X_CCCR_EFBI BIT(13) > +#define TCAN4X5X_CCCR_PXHD_DIS BIT(12) > +#define TCAN4X5X_CCCR_BRSE BIT(9) > +#define TCAN4X5X_CCCR_FDOE BIT(8) > +#define TCAN4X5X_CCCR_TEST BIT(7) > +#define TCAN4X5X_CCCR_DAR_DIS BIT(6) > +#define TCAN4X5X_CCCR_MON BIT(5) > +#define TCAN4X5X_CCCR_CSR BIT(4) > +#define TCAN4X5X_CCCR_CSA BIT(3) > +#define TCAN4X5X_CCCR_ASM BIT(2) > +#define TCAN4X5X_CCCR_CCE BIT(1) > +#define TCAN4X5X_CCCR_INIT BIT(0) > + > +#define TCAN4X5X_EINT0 BIT(0) > +#define TCAN4X5X_EINT1 BIT(1) > + > +struct tcan4x5x_rx_regs { > + u32 fifo_status_reg; > + u32 fifo_config_reg; > + u32 fifo_ack_reg; > + u32 rx_buf_shift; > +}; > + > +struct tcan4x5x_rx_regs tcan4x5x_fifo_regs[] = { > + { TCAN4X5X_MCAN_RXF0S, TCAN4X5X_MCAN_RXF0C, TCAN4X5X_MCAN_RXF0A, 0}, > + { TCAN4X5X_MCAN_RXF1S, TCAN4X5X_MCAN_RXF1C, TCAN4X5X_MCAN_RXF1A, 4}, > + { TCAN4X5X_MCAN_NDAT1, TCAN4X5X_MCAN_RXBC, TCAN4X5X_MCAN_NDAT1, 8}, > +}; > + > +enum tcan4x5x_data_size { > + TCAN4X5X_8_BYTE = 0, > + TCAN4X5X_12_BYTE, > + TCAN4X5X_16_BYTE, > + TCAN4X5X_20_BYTE, > + TCAN4X5X_24_BYTE, > + TCAN4X5X_32_BYTE, > + TCAN4X5X_48_BYTE, > + TCAN4X5X_64_BYTE, > +}; > + > +static const struct can_bittiming_const tcan4x5x_bittiming_const = { > + .name = DEVICE_NAME, > + .tseg1_min = 2, > + .tseg1_max = 31, > + .tseg2_min = 2, > + .tseg2_max = 16, > + .sjw_max = 16, > + .brp_min = 1, > + .brp_max = 32, > + .brp_inc = 1, > +}; > + > +static const struct can_bittiming_const tcan4x5x_data_bittiming_const = { > + .name = DEVICE_NAME, > + .tseg1_min = 1, > + .tseg1_max = 32, > + .tseg2_min = 1, > + .tseg2_max = 16, > + .sjw_max = 16, > + .brp_min = 1, > + .brp_max = 32, > + .brp_inc = 1, > +}; > + > +static void tcan4x5x_clean(struct net_device *net) > +{ > + struct tcan4x5x_priv *priv = netdev_priv(net); > + > + if (priv->tx_skb || priv->tx_len) > + net->stats.tx_errors++; > + if (priv->tx_skb) > + dev_kfree_skb(priv->tx_skb); > + if (priv->tx_len) > + can_free_echo_skb(priv->net, 0); > + > + priv->tx_skb = NULL; > + priv->tx_len = 0; > +} > + > +static int regmap_spi_gather_write(void *context, const void *reg, > + size_t reg_len, const void *val, > + size_t val_len) > +{ > + struct device *dev = context; > + struct spi_device *spi = to_spi_device(dev); > + u32 addr; > + struct spi_message m; > + struct spi_transfer t[2] = {{ .tx_buf = &addr, .len = 4, .cs_change = 0,}, > + { .tx_buf = val, .len = val_len, },}; > + > + addr = TCAN4X5X_WRITE_CMD | (*((u16 *)reg) << 8) | val_len >> 2; > + > + spi_message_init(&m); > + spi_message_add_tail(&t[0], &m); > + spi_message_add_tail(&t[1], &m); > + > + return spi_sync(spi, &m); > +} > + > +static int tcan4x5x_regmap_write(void *context, const void *data, size_t count) > +{ > + u16 *reg = (u16 *)(data); > + const u32 *val = data + 2; > + > + return regmap_spi_gather_write(context, reg, 2, val, count - 2); > +} > + > +static int regmap_spi_async_write(void *context, > + const void *reg, size_t reg_len, > + const void *val, size_t val_len, > + struct regmap_async *a) > +{ > + return -ENOTSUPP; > +} > + > +static struct regmap_async *regmap_spi_async_alloc(void) > +{ > + return NULL; > +} > + > +static int tcan4x5x_regmap_read(void *context, > + const void *reg, size_t reg_size, > + void *val, size_t val_size) > +{ > + struct device *dev = context; > + struct spi_device *spi = to_spi_device(dev); > + > + u32 addr = TCAN4X5X_READ_CMD | (*((u16 *)reg) << 8) | val_size >> 2; > + > + return spi_write_then_read(spi, &addr, 4, val, val_size); > +} > + > +static struct regmap_bus tcan4x5x_bus = { > + .write = tcan4x5x_regmap_write, > + .gather_write = regmap_spi_gather_write, > + .async_write = regmap_spi_async_write, > + .async_alloc = regmap_spi_async_alloc, > + .read = tcan4x5x_regmap_read, > + .read_flag_mask = 0x00, > + .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, > + .val_format_endian_default = REGMAP_ENDIAN_NATIVE, > +}; > + > +static uint8_t tcan4x5x_dlc_conv(uint8_t input) > +{ > + const static u8 lookup[7] = {12, 16, 20, 24, 32, 48, 64}; > + > + if (input < 9) > + return input; > + > + if (input < 16) > + return lookup[(unsigned int)(input - 9)]; > + > + return 0; > +} > + > +static uint8_t tcan4x5x_txrxesc_value(uint8_t input) > +{ > + const u8 lookup[8] = {8, 12, 16, 20, 24, 32, 48, 64}; > + return lookup[(unsigned int)(input & 0x07)]; > +} > + > +static void tcan4x5x_hw_tx(struct tcan4x5x_priv *tcan4x5x) > +{ > + u32 sid, eid, exide, rtr, brs, esi, fdf, xtd, data_len; > + u32 mcan_address, mcan_tx_element_sz; > + int queue_stat, queue_lvl, queue_idx; > + struct canfd_frame *fd_frame; > + struct can_frame *frame; > + int tx_element_sz, i, temp; > + canid_t frame_id; > + u8 dlc_len; > + > + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXFQS, &queue_stat); > + queue_lvl = queue_stat & TCAN4x5x_QUEUE_LVL_MASK; > + queue_idx = (queue_stat & TCAN4x5x_QUEUE_IDX_MASK) >> TCAN4x5x_QUEUE_IDX_SHIFT; > + > + if (tcan4x5x->tx_skb->len == CAN_MTU) { > + fd_frame = NULL; > + frame = (struct can_frame *)tcan4x5x->tx_skb->data; > + frame_id = frame->can_id; > + dlc_len = frame->can_dlc; > + data_len = ((dlc_len % 4) + dlc_len) / 4; > + brs = 0; > + } else if (tcan4x5x->tx_skb->len == CANFD_MTU) { > + frame = NULL; > + fd_frame = (struct canfd_frame *)tcan4x5x->tx_skb->data; > + frame_id = fd_frame->can_id; > + dlc_len = fd_frame->len; > + data_len = ((dlc_len % 4) + dlc_len) / 4; > + brs = fd_frame->flags & CANFD_BRS; > + esi = fd_frame->flags & CANFD_ESI; > + fdf = 1; > + } else { > + return; > + } > + > + eid = frame_id & CAN_EFF_MASK; > + rtr = (frame_id & CAN_RTR_FLAG) ? 1 : 0; > + > + exide = (frame_id & CAN_EFF_FLAG) ? 1 : 0; > + if (exide) { > + sid = frame_id & CAN_EFF_MASK; > + xtd = 1; > + } else { > + sid = (frame_id & CAN_SFF_MASK) << TCAN4X5X_SID_SHIFT; > + xtd = 0; > + } > + > + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBC, &mcan_address); > + > + mcan_address = (mcan_address & 0xffff) + TCAN4X5X_MRAM_START; > + temp = (uint8_t)((mcan_address >> 24) & 0x3F); > + > + tx_element_sz = temp > 32 ? 32 : temp; > + temp = (uint8_t)((mcan_address >> 16) & 0x3F); > + > + tx_element_sz += temp > 32 ? 32 : temp; > + mcan_address += ((uint32_t)tx_element_sz * queue_idx); > + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXESC, &mcan_tx_element_sz); > + tx_element_sz = tcan4x5x_txrxesc_value(mcan_tx_element_sz & 0x07) + 8; > + mcan_address += ((uint32_t)tx_element_sz * 0); > + > + tx_element_sz = (tcan4x5x_dlc_conv(dlc_len & 0x0F) + 8) >> 2; > + if (tcan4x5x_dlc_conv(dlc_len & 0x0F) % 4) > + tx_element_sz += 1; > + > + tcan4x5x->spi_tx_buf[0] = esi << TCAN4X5X_ESI_SHIFT | > + xtd << TCAN4X5X_XTD_SHIFT | > + rtr << TCAN4X5X_RTR_SHIFT | sid; > + > + tcan4x5x->spi_tx_buf[1] = fdf << TCAN4X5X_FDF_SHIFT | > + brs << TCAN4X5X_BRS_SHIFT | dlc_len << TCAN4X5X_DLC_SHIFT; > + > + if (tcan4x5x->tx_skb->len == CAN_MTU) > + memcpy(tcan4x5x->spi_tx_buf + TCAN4X5X_DATA_PKT_OFF, > + frame->data, dlc_len); > + else > + memcpy(tcan4x5x->spi_tx_buf + TCAN4X5X_DATA_PKT_OFF, > + fd_frame->data, dlc_len); > + > + for (i = dlc_len + 1; i < TCAN4X5X_BUF_LEN / 4; i++) > + tcan4x5x->spi_tx_buf[i] = 0; > + > + regmap_bulk_write(tcan4x5x->regmap, mcan_address, tcan4x5x->spi_tx_buf, > + TCAN4X5X_BUF_LEN); > + > + regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBAR, (1 << (queue_idx))); > +} > + > +int tcan4x5x_hw_rx(struct tcan4x5x_priv *tcan4x5x) > +{ > + u32 queue_idx, fifo_idx, fifo_start_addr, rx_buf_size, msg_type; > + u32 data_buffer[TCAN4X5X_BUF_LEN] = {0x0}; > + u32 rx_header[2] = {0x0}; > + struct tcan4x5x_rx_regs *buffer_regs; > + struct canfd_frame *fd_frame; > + int dlc_len, data_len; > + struct sk_buff *skb; > + > + skb = alloc_canfd_skb(tcan4x5x->net, &fd_frame); > + if (!skb) { > + dev_err(&tcan4x5x->spi->dev, "cannot allocate RX skb\n"); > + tcan4x5x->net->stats.rx_dropped++; > + return -ENOMEM; > + } > + > + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, &msg_type); > + if (msg_type & TCAN4X5X_RX_FIFO0_MESSAGE) { > + buffer_regs = &tcan4x5x_fifo_regs[0]; > + } else if (msg_type & TCAN4X5X_RX_FIFO1_MESSAGE) { > + buffer_regs = &tcan4x5x_fifo_regs[1]; > + } else if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) { > + buffer_regs = &tcan4x5x_fifo_regs[2]; > + } else { > + buffer_regs = NULL; > + return -EINVAL; > + } > + > + rx_buf_size = TCAN4X5X_BUF_LEN; > + > + /* Determine which FIFO needs service */ > + regmap_read(tcan4x5x->regmap, buffer_regs->fifo_status_reg, &fifo_idx); > + if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) > + queue_idx = fifo_idx - 1; > + else > + queue_idx = (TCAN4X5X_RX_INDEX_MASK & fifo_idx) >> TCAN4X5X_RX_INDEX_SHIFT; > + > + /* Calculate the FIFO start address to service */ > + regmap_read(tcan4x5x->regmap, buffer_regs->fifo_config_reg, &fifo_start_addr); > + fifo_start_addr = (TCAN4X5X_RX_ADDR_MASK & fifo_start_addr); > + if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) > + fifo_start_addr = fifo_start_addr + TCAN4X5X_RX_BUF_ADDR_OFFSET + > + (rx_buf_size * queue_idx); > + else > + fifo_start_addr = fifo_start_addr + TCAN4X5X_RX_ADDR_OFFSET + > + (rx_buf_size * queue_idx); > + > + regmap_bulk_read(tcan4x5x->regmap, fifo_start_addr, rx_header, 2); > + > + dlc_len = (rx_header[1] & TCAN4X5X_DLC_MASK) >> TCAN4X5X_DLC_SHIFT; > + if (dlc_len <= 8) > + data_len = dlc_len; > + else > + data_len = tcan4x5x_txrxesc_value(dlc_len); > + > + regmap_bulk_read(tcan4x5x->regmap, fifo_start_addr + 8, > + data_buffer, data_len / 4); > + > + /* Acknowledge receipt of the data */ > + regmap_write(tcan4x5x->regmap, buffer_regs->fifo_ack_reg, queue_idx); > + > + if (rx_header[0] & TCAN4X5X_XTD_MASK) { > + fd_frame->can_id = CAN_EFF_FLAG; > + fd_frame->can_id |= (rx_header[0] & CAN_EFF_MASK); > + } else { > + fd_frame->can_id |= ((rx_header[0] >> TCAN4X5X_SID_SHIFT) & > + CAN_SFF_MASK); > + } > + > + if (rx_header[0] & TCAN4X5X_RTR_MASK) > + fd_frame->can_id |= CAN_RTR_FLAG; > + > + if (rx_header[0] & TCAN4X5X_ESI_MASK) { > + fd_frame->can_id |= CAN_ERR_FLAG; > + fd_frame->flags |= CANFD_ESI; > + netdev_dbg(tcan4x5x->net, "ESI Error\n"); > + } > + > + fd_frame->len = data_len; > + memcpy(fd_frame->data, data_buffer, fd_frame->len); > + > + tcan4x5x->net->stats.rx_packets++; > + tcan4x5x->net->stats.rx_bytes += fd_frame->len; > + > + can_led_event(tcan4x5x->net, CAN_LED_EVENT_RX); > + netif_rx_ni(skb); > + > + return 0; > +} > + > +static void tcan4x5x_sleep(struct spi_device *spi) > +{ > + struct tcan4x5x_priv *tcan4x5x = spi_get_drvdata(spi); > + > + regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, > + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_STANDBY); > +} > + > +static int tcan4x5x_reset(struct net_device *net) > +{ > + struct tcan4x5x_priv *tcan4x5x = netdev_priv(net); > + > + if (tcan4x5x->reset_gpio) { > + gpiod_set_value_cansleep(tcan4x5x->reset_gpio, 1); > + udelay(10); > + gpiod_set_value_cansleep(tcan4x5x->reset_gpio, 0); > + } else { > + regmap_write(tcan4x5x->regmap, TCAN4X5X_CONFIG, > + TCAN4X5X_SW_RESET); > + } > + > + return 0; > +} > + > +static int tcan4x5x_power_enable(struct regulator *reg, int enable) > +{ > + if (IS_ERR_OR_NULL(reg)) > + return 0; > + > + if (enable) > + return regulator_enable(reg); > + else > + return regulator_disable(reg); > +} > + > +static irqreturn_t tcan4x5x_can_ist(int irq, void *dev_id) > +{ > + struct tcan4x5x_priv *tcan4x5x = dev_id; > + struct spi_device *spi = tcan4x5x->spi; > + struct net_device *net = tcan4x5x->net; > + enum can_state new_state; > + int intf, eflag, mcan_intf; > + > + mutex_lock(&tcan4x5x->tcan4x5x_lock); > + > + regmap_read(tcan4x5x->regmap, TCAN4X5X_INT_FLAGS, &intf); > + if (intf & TCAN4X5X_MCAN_INT) > + tcan4x5x_hw_rx(tcan4x5x); > + > + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, &mcan_intf); > + > + regmap_read(tcan4x5x->regmap, TCAN4X5X_STATUS, &eflag); > + /* Update can state */ > + if (eflag & TCAN4X5X_MCAN_IR_BO) > + new_state = CAN_STATE_BUS_OFF; > + else if (eflag & TCAN4X5X_MCAN_IR_EP) > + new_state = CAN_STATE_ERROR_PASSIVE; > + else if (eflag & TCAN4X5X_MCAN_IR_EW) > + new_state = CAN_STATE_ERROR_WARNING; > + else > + new_state = CAN_STATE_ERROR_ACTIVE; > + > + if (new_state != tcan4x5x->can.state) { > + struct can_frame *cf; > + struct sk_buff *skb; > + enum can_state rx_state, tx_state; > + u32 error_count; > + > + skb = alloc_can_err_skb(net, &cf); > + if (!skb) > + goto ist_out; > + > + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_ECR, &error_count); > + cf->data[6] = error_count & 0xff; > + cf->data[7] = error_count & 0x7f00 >> 8; > + tx_state = cf->data[6] >= cf->data[7] ? new_state : 0; > + rx_state = cf->data[6] <= cf->data[7] ? new_state : 0; > + can_change_state(net, cf, tx_state, rx_state); > + netif_rx_ni(skb); > + > + if (new_state == CAN_STATE_BUS_OFF) { > + can_bus_off(net); > + if (tcan4x5x->can.restart_ms == 0) { > + tcan4x5x->force_quit = 1; > + tcan4x5x_sleep(spi); > + goto ist_out; > + } > + } > + } > + > + /* Update bus errors */ > + if ((intf & TCAN4X5X_BUS_FAULT) && > + (tcan4x5x->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) { > + struct can_frame *cf; > + struct sk_buff *skb; > + u32 psr_err, error_count; > + > + /* Check for protocol errors */ > + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_PSR, &psr_err); > + if (psr_err & TCAN4X5X_ERR_PROTOCOL_MASK) { > + skb = alloc_can_err_skb(net, &cf); > + if (!skb) > + goto ist_out; > + > + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; > + tcan4x5x->can.can_stats.bus_error++; > + tcan4x5x->net->stats.rx_errors++; > + if (psr_err & TCAN4X5X_ERR_BIT0ERR) > + cf->data[2] |= CAN_ERR_PROT_BIT0; > + else if (psr_err & TCAN4X5X_ERR_BIT1ERR) > + cf->data[2] |= CAN_ERR_PROT_BIT1; > + else if (psr_err & TCAN4X5X_ERR_FRMERR) > + cf->data[2] |= CAN_ERR_PROT_FORM; > + else if (psr_err & TCAN4X5X_ERR_STUFERR) > + cf->data[2] |= CAN_ERR_PROT_STUFF; > + else if (psr_err & TCAN4X5X_ERR_CRCERR) > + cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; > + else if (psr_err & TCAN4X5X_ERR_ACKERR) > + cf->data[3] |= CAN_ERR_PROT_LOC_ACK; > + > + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_ECR, > + &error_count); > + cf->data[6] = error_count & 0xff; > + cf->data[7] = error_count & 0x7f00 >> 8; > + netdev_dbg(tcan4x5x->net, "Bus Error\n"); > + netif_rx_ni(skb); > + } > + } > + > + if (mcan_intf & TCAN4X5X_MCAN_IR_TC) { > + net->stats.tx_packets++; > + net->stats.tx_bytes += tcan4x5x->tx_len - 1; > + can_led_event(net, CAN_LED_EVENT_TX); > + if (tcan4x5x->tx_len) { > + can_get_echo_skb(net, 0); > + tcan4x5x->tx_len = 0; > + } > + netif_wake_queue(net); > + } > + > +ist_out: > + regmap_write(tcan4x5x->regmap, TCAN4X5X_INT_FLAGS, TCAN4X5X_CLEAR_ALL_INT); > + regmap_write(tcan4x5x->regmap, TCAN4X5X_STATUS, TCAN4X5X_CLEAR_ALL_INT); > + regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, > + TCAN4X5X_CLEAR_ALL_INT); > + > + mutex_unlock(&tcan4x5x->tcan4x5x_lock); > + return IRQ_HANDLED; > +} > + > +static int tcan4x5x_do_set_bittiming(struct net_device *net) > +{ > + struct tcan4x5x_priv *priv = netdev_priv(net); > + struct can_bittiming *bt = &priv->can.bittiming; > + struct can_bittiming *dbt = &priv->can.data_bittiming; > + u16 brp, sjw, tseg1, tseg2; > + int ret; > + u32 val; > + > + brp = bt->brp - 1; > + sjw = bt->sjw - 1; > + tseg1 = bt->prop_seg + bt->phase_seg1 - 1; > + tseg2 = bt->phase_seg2 - 1; > + val = (brp << TCAN4X5X_NBRP_SHIFT) | (sjw << TCAN4X5X_NSJW_SHIFT) | > + (tseg1 << TCAN4X5X_NTSEG1_SHIFT) | tseg2; > + > + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_NBTP, val); > + if (ret) > + return -EIO; > + > + if (priv->can.ctrlmode & CAN_CTRLMODE_FD) { > + val = 0; > + brp = dbt->brp - 1; > + sjw = dbt->sjw - 1; > + tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1; > + tseg2 = dbt->phase_seg2 - 1; > + > + /* TDC is only needed for bitrates beyond 2.5 MBit/s. > + * This is mentioned in the "Bit Time Requirements for CAN FD" > + * paper presented at the International CAN Conference 2013 > + */ > + if (dbt->bitrate > 2500000) { > + u32 tdco, ssp; > + > + /* Use the same value of secondary sampling point > + * as the data sampling point > + */ > + ssp = dbt->sample_point; > + > + /* Equation based on Bosch's M_CAN User Manual's > + * Transmitter Delay Compensation Section > + */ > + tdco = (priv->can.clock.freq / 1000) * > + ssp / dbt->bitrate; > + > + /* Max valid TDCO value is 127 */ > + if (tdco > 127) { > + netdev_warn(net, "TDCO value of %u is beyond maximum. Using maximum possible value\n", > + tdco); > + tdco = 127; > + } > + > + val |= DBTP_TDC; > + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_TDCR, > + tdco << TCAN4X5X_TDCR_TDCO_SHIFT); > + if (ret) > + return -EIO; > + } > + > + val |= (brp << DBTP_DBRP_SHIFT) | > + (sjw << DBTP_DSJW_SHIFT) | > + (tseg1 << DBTP_DTSEG1_SHIFT) | > + (tseg2 << DBTP_DTSEG2_SHIFT); > + > + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_DBTP, val); > + } > + > + return ret; > +} > + > +static int tcan4x5x_setup(struct spi_device *spi) > +{ > + struct tcan4x5x_priv *tcan4x5x = spi_get_drvdata(spi); > + int start_reg = TCAN4X5X_MRAM_START; > + int end_reg = start_reg + TCAN4X5X_MRAM_SIZE; > + int ret; > + > + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_REG, > + TCAN4X5X_CLEAR_ALL_INT); > + if (ret) > + return -EIO; > + > + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_EN, > + TCAN4X5X_ENABLE_MCAN_INT); > + if (ret) > + return -EIO; > + > + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_CCCR, > + TCAN4X5X_CCCR_INIT | TCAN4X5X_CCCR_CCE); > + if (ret) > + return -EIO; > + > + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_CCCR, > + TCAN4X5X_CCCR_INIT | TCAN4X5X_CCCR_CCE | > + TCAN4X5X_CCCR_FDOE | TCAN4X5X_CCCR_BRSE); > + if (ret) > + return -EIO; > + > + ret = tcan4x5x_do_set_bittiming(tcan4x5x->net); > + if (ret) > + return -EIO; > + > + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXESC, > + TCAN4X5X_64_BYTE); > + if (ret) > + return -EIO; > + > + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBC, > + (TCAN4X5X_NUM_TX_BUF << TCAN4X5X_TX_QUEUE_SHIFT | > + TCAN4X5X_TX_BUF_START)); > + if (ret) > + return -EIO; > + > + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_RXF0C, > + (TCAN4X5X_RX_WATER_MARK << TCAN4X5X_RX_WATER_MARK_SHIFT | > + TCAN4X5X_NUM_RX_BUF << TCAN4X5X_RX_FIFO_SZ_SHIFT | > + TCAN4X5X_RX_BUF_START)); > + if (ret) > + return -EIO; > + > + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_RXESC, > + (TCAN4X5X_64_BYTE << TCAN4X5X_RX_RBDS_SHIFT | > + TCAN4X5X_64_BYTE << TCAN4X5X_RX_F1DS_SHIFT | > + TCAN4X5X_64_BYTE)); > + if (ret) > + return -EIO; > + > + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBTIE, > + TCAN4X5X_SET_ALL_INT); > + if (ret) > + return -EIO; > + > + > + ret = regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, > + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_NORMAL); > + if (ret) > + return -EIO; > + > + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_ILE, TCAN4X5X_EINT0); > + if (ret) > + return -EIO; > + > + /* Zero out the MCAN buffers */ > + while (start_reg < end_reg) { > + regmap_write(tcan4x5x->regmap, start_reg, 0); > + start_reg += 4; > + } > + > + return ret; > +} > + > +static void tcan4x5x_tx_work_handler(struct work_struct *ws) > +{ > + struct tcan4x5x_priv *tcan4x5x = container_of(ws, struct tcan4x5x_priv, > + tx_work); > + struct net_device *net = tcan4x5x->net; > + struct can_frame *frame; > + > + mutex_lock(&tcan4x5x->tcan4x5x_lock); > + if (tcan4x5x->tx_skb) { > + if (tcan4x5x->can.state == CAN_STATE_BUS_OFF) { > + tcan4x5x_clean(net); > + } else { > + frame = (struct can_frame *)tcan4x5x->tx_skb->data; > + tcan4x5x_hw_tx(tcan4x5x); > + tcan4x5x->tx_len = 1 + frame->can_dlc; > + can_put_echo_skb(tcan4x5x->tx_skb, net, 0); > + tcan4x5x->tx_skb = NULL; > + } > + } > + mutex_unlock(&tcan4x5x->tcan4x5x_lock); > +} > + > +static void tcan4x5x_restart_work_handler(struct work_struct *ws) > +{ > + struct tcan4x5x_priv *tcan4x5x = container_of(ws, struct tcan4x5x_priv, > + restart_work); > + struct spi_device *spi = tcan4x5x->spi; > + struct net_device *net = tcan4x5x->net; > + > + mutex_lock(&tcan4x5x->tcan4x5x_lock); > + if (tcan4x5x->after_suspend) { > + tcan4x5x_reset(net); > + tcan4x5x_setup(spi); > + if (tcan4x5x->after_suspend & AFTER_SUSPEND_RESTART) { > + tcan4x5x_setup(spi); > + } else if (tcan4x5x->after_suspend & AFTER_SUSPEND_UP) { > + netif_device_attach(net); > + tcan4x5x_clean(net); > + tcan4x5x_setup(spi); > + netif_wake_queue(net); > + } else { > + tcan4x5x_sleep(spi); > + } > + tcan4x5x->after_suspend = 0; > + tcan4x5x->force_quit = 0; > + } > + > + if (tcan4x5x->restart_tx) { > + tcan4x5x->restart_tx = 0; > + tcan4x5x_reset(net); > + tcan4x5x_clean(net); > + tcan4x5x_setup(spi); > + netif_wake_queue(net); > + } > + mutex_unlock(&tcan4x5x->tcan4x5x_lock); > +} > + > +static int tcan4x5x_open(struct net_device *net) > +{ > + struct tcan4x5x_priv *priv = netdev_priv(net); > + struct spi_device *spi = priv->spi; > + unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_LOW; > + int ret; > + > + ret = open_candev(net); > + if (ret) > + return ret; > + > + mutex_lock(&priv->tcan4x5x_lock); > + tcan4x5x_power_enable(priv->power, 1); > + > + priv->force_quit = 0; > + priv->tx_skb = NULL; > + priv->tx_len = 0; > + > + ret = request_threaded_irq(priv->irq, NULL, tcan4x5x_can_ist, > + flags, DEVICE_NAME, priv); > + if (ret) { > + dev_err(&spi->dev, "failed to acquire irq %d %i\n", > + priv->irq, ret); > + goto out_close; > + } > + > + priv->wq = alloc_workqueue("tcan4x5x_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM, > + 0); > + if (!priv->wq) { > + ret = -ENOMEM; > + goto out_free_irq; > + } > + > + INIT_WORK(&priv->tx_work, tcan4x5x_tx_work_handler); > + INIT_WORK(&priv->restart_work, tcan4x5x_restart_work_handler); > + > + priv->spi_tx_buf = devm_kzalloc(&spi->dev, TCAN4X5X_BUF_LEN, > + GFP_KERNEL); > + if (!priv->spi_tx_buf) { > + ret = -ENOMEM; > + goto out_free_wq; > + } > + > + priv->spi_rx_buf = devm_kzalloc(&spi->dev, TCAN4X5X_BUF_LEN, > + GFP_KERNEL); > + if (!priv->spi_rx_buf) { > + ret = -ENOMEM; > + goto out_free_wq; > + } > + > + if (priv->wake_gpio) > + gpiod_set_value_cansleep(priv->wake_gpio, 1); > + > + ret = tcan4x5x_reset(net); > + if (ret) > + goto out_free_wq; > + > + ret = tcan4x5x_setup(spi); > + if (ret) > + goto out_free_wq; > + > + can_led_event(net, CAN_LED_EVENT_OPEN); > + netif_wake_queue(net); > + mutex_unlock(&priv->tcan4x5x_lock); > + > + return 0; > + > + out_free_wq: > + destroy_workqueue(priv->wq); > + out_free_irq: > + free_irq(priv->irq, priv); > + tcan4x5x_sleep(spi); > + out_close: > + tcan4x5x_power_enable(priv->power, 0); > + close_candev(net); > + mutex_unlock(&priv->tcan4x5x_lock); > + return ret; > +} > + > +static int tcan4x5x_stop(struct net_device *net) > +{ > + struct tcan4x5x_priv *priv = netdev_priv(net); > + struct spi_device *spi = priv->spi; > + > + close_candev(net); > + > + priv->force_quit = 1; > + free_irq(priv->irq, priv); > + destroy_workqueue(priv->wq); > + priv->wq = NULL; > + > + mutex_lock(&priv->tcan4x5x_lock); > + > + priv->can.state = CAN_STATE_STOPPED; > + tcan4x5x_sleep(spi); > + tcan4x5x_power_enable(priv->power, 0); > + > + mutex_unlock(&priv->tcan4x5x_lock); > + > + can_led_event(net, CAN_LED_EVENT_STOP); > + > + return 0; > +} > + > +static netdev_tx_t tcan4x5x_hard_start_xmit(struct sk_buff *skb, > + struct net_device *net) > +{ > + struct tcan4x5x_priv *priv = netdev_priv(net); > + struct spi_device *spi = priv->spi; > + > + if (priv->tx_skb || priv->tx_len) { > + dev_warn(&spi->dev, "hard_xmit called while tx busy\n"); > + return NETDEV_TX_BUSY; > + } > + > + if (can_dropped_invalid_skb(net, skb)) > + return NETDEV_TX_OK; > + > + netif_stop_queue(net); > + priv->tx_skb = skb; > + queue_work(priv->wq, &priv->tx_work); > + > + return NETDEV_TX_OK; > +} > + > +static int tcan4x5x_do_set_mode(struct net_device *net, enum can_mode mode) > +{ > + struct tcan4x5x_priv *priv = netdev_priv(net); > + > + switch (mode) { > + case CAN_MODE_START: > + tcan4x5x_clean(net); > + priv->can.state = CAN_STATE_ERROR_ACTIVE; > + priv->restart_tx = 1; > + queue_work(priv->wq, &priv->restart_work); > + break; > + default: > + return -EOPNOTSUPP; > + } > + > + return 0; > +} > + > +static const struct net_device_ops tcan4x5x_netdev_ops = { > + .ndo_open = tcan4x5x_open, > + .ndo_stop = tcan4x5x_stop, > + .ndo_start_xmit = tcan4x5x_hard_start_xmit, > + .ndo_change_mtu = can_change_mtu, > +}; > + > +static int tcan4x5x_parse_config(struct tcan4x5x_priv *tcan4x5x) > +{ > + tcan4x5x->reset_gpio = devm_gpiod_get_optional(&tcan4x5x->spi->dev, > + "reset", GPIOD_OUT_LOW); > + if (IS_ERR(tcan4x5x->reset_gpio)) > + tcan4x5x->reset_gpio = NULL; > + > + tcan4x5x->wake_gpio = devm_gpiod_get_optional(&tcan4x5x->spi->dev, > + "wake-up", GPIOD_OUT_LOW); > + if (IS_ERR(tcan4x5x->wake_gpio)) > + tcan4x5x->wake_gpio = NULL; > + > + tcan4x5x->interrupt_gpio = devm_gpiod_get(&tcan4x5x->spi->dev, > + "data-ready", GPIOD_IN); > + if (IS_ERR(tcan4x5x->interrupt_gpio)) { > + dev_err(&tcan4x5x->spi->dev, "data-ready gpio not defined\n"); > + return -EINVAL; > + } > + > + tcan4x5x->irq = gpiod_to_irq(tcan4x5x->interrupt_gpio); > + > + tcan4x5x->power = devm_regulator_get_optional(&tcan4x5x->spi->dev, > + "vsup"); > + if (PTR_ERR(tcan4x5x->power) == -EPROBE_DEFER) > + return -EPROBE_DEFER; > + > + return 0; > +} > + > +static const struct regmap_config tcan4x5x_regmap = { > + .reg_bits = 16, > + .val_bits = 32, > + .cache_type = REGCACHE_NONE, > + .max_register = TCAN4X5X_MAX_REGISTER, > +}; > + > +static int tcan4x5x_can_probe(struct spi_device *spi) > +{ > + struct net_device *net; > + struct tcan4x5x_priv *priv; > + struct clk *clk; > + int freq, ret; > + > + clk = devm_clk_get(&spi->dev, NULL); > + if (IS_ERR(clk)) { > + dev_err(&spi->dev, "no CAN clock source defined\n"); > + freq = TCAN4X5X_EXT_CLK_DEF; > + } else { > + freq = clk_get_rate(clk); > + } > + > + /* Sanity check */ > + if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF) > + return -ERANGE; > + > + /* Allocate can/net device */ > + net = alloc_candev(sizeof(*priv), TCAN4X5X_TX_ECHO_SKB_MAX); > + if (!net) > + return -ENOMEM; > + > + if (!IS_ERR(clk)) { > + ret = clk_prepare_enable(clk); > + if (ret) > + goto out_free; > + } > + > + net->netdev_ops = &tcan4x5x_netdev_ops; > + net->flags |= IFF_ECHO; > + net->mtu = CANFD_MTU; > + > + priv = netdev_priv(net); > + priv->can.bittiming_const = &tcan4x5x_bittiming_const; > + priv->can.data_bittiming_const = &tcan4x5x_data_bittiming_const; > + priv->can.do_set_mode = tcan4x5x_do_set_mode; > + priv->can.clock.freq = freq; > + priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | > + CAN_CTRLMODE_LISTENONLY | > + CAN_CTRLMODE_BERR_REPORTING | > + CAN_CTRLMODE_FD | > + CAN_CTRLMODE_FD_NON_ISO; > + priv->net = net; > + priv->spi = spi; > + priv->clk = clk; > + spi_set_drvdata(spi, priv); > + > + ret = tcan4x5x_parse_config(priv); > + if (ret) > + goto out_clk; > + > + /* Configure the SPI bus */ > + spi->bits_per_word = 32; > + ret = spi_setup(spi); > + if (ret) > + goto out_clk; > + > + mutex_init(&priv->tcan4x5x_lock); > + > + priv->regmap = devm_regmap_init(&spi->dev, &tcan4x5x_bus, > + &spi->dev, &tcan4x5x_regmap); > + > + SET_NETDEV_DEV(net, &spi->dev); > + ret = register_candev(net); > + if (ret) > + goto error_probe; > + > + devm_can_led_init(net); > + > + netdev_info(net, "TCAN4X5X successfully initialized.\n"); > + return 0; > + > +error_probe: > + tcan4x5x_power_enable(priv->power, 0); > +out_clk: > + if (!IS_ERR(clk)) > + clk_disable_unprepare(clk); > +out_free: > + free_candev(net); > + dev_err(&spi->dev, "Probe failed, err=%d\n", -ret); > + return ret; > +} > + > +static int tcan4x5x_can_remove(struct spi_device *spi) > +{ > + struct tcan4x5x_priv *priv = spi_get_drvdata(spi); > + struct net_device *net = priv->net; > + > + unregister_candev(net); > + > + tcan4x5x_power_enable(priv->power, 0); > + > + if (!IS_ERR(priv->clk)) > + clk_disable_unprepare(priv->clk); > + > + free_candev(net); > + > + return 0; > +} > + > +static const struct of_device_id tcan4x5x_of_match[] = { > + { .compatible = "ti,tcan4x5x", }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, tcan4x5x_of_match); > + > +static const struct spi_device_id tcan4x5x_id_table[] = { > + { > + .name = "tcan4x5x", > + .driver_data = 0, > + }, > + { } > +}; > +MODULE_DEVICE_TABLE(spi, tcan4x5x_id_table); > + > +static struct spi_driver tcan4x5x_can_driver = { > + .driver = { > + .name = DEVICE_NAME, > + .of_match_table = tcan4x5x_of_match, > + .pm = NULL, > + }, > + .id_table = tcan4x5x_id_table, > + .probe = tcan4x5x_can_probe, > + .remove = tcan4x5x_can_remove, > +}; > +module_spi_driver(tcan4x5x_can_driver); > + > +MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); > +MODULE_DESCRIPTION("Texas Instruments TCAN4x5x CAN driver"); > +MODULE_LICENSE("GPL v2"); > diff --git a/drivers/net/can/spi/tcan4x5x.h b/drivers/net/can/spi/tcan4x5x.h > new file mode 100644 > index 000000000000..5e14ba571d49 > --- /dev/null > +++ b/drivers/net/can/spi/tcan4x5x.h > @@ -0,0 +1,109 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// SPI to CAN driver for the Texas Instruments TCA4x5x > +// Flash driver chip family > +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ > + > +#define TCAN4X5X_DEV_ID0 0x00 > +#define TCAN4X5X_DEV_ID1 0x04 > +#define TCAN4X5X_REV 0x08 > +#define TCAN4X5X_STATUS 0x0C > +#define TCAN4X5X_ERROR_STATUS 0x10 > +#define TCAN4X5X_CONTROL 0x14 > + > +#define TCAN4X5X_CONFIG 0x800 > +#define TCAN4X5X_TS_PRESCALE 0x804 > +#define TCAN4X5X_TEST_REG 0x808 > +#define TCAN4X5X_INT_FLAGS 0x820 > +#define TCAN4X5X_MCAN_INT_REG 0x824 > +#define TCAN4X5X_INT_EN 0x830 > + > +#define TCAN4X5X_MCAN_CREL 0x1000 > +#define TCAN4X5X_MCAN_ENDN 0x1004 > +#define TCAN4X5X_MCAN_CUST 0x1008 > +#define TCAN4X5X_MCAN_DBTP 0x100C > +#define TCAN4X5X_MCAN_TEST 0x1010 > +#define TCAN4X5X_MCAN_RWD 0x1014 > +#define TCAN4X5X_MCAN_CCCR 0x1018 > +#define TCAN4X5X_MCAN_NBTP 0x101C > +#define TCAN4X5X_MCAN_TSCC 0x1020 > +#define TCAN4X5X_MCAN_TSCV 0x1024 > +#define TCAN4X5X_MCAN_TOCC 0x1028 > +#define TCAN4X5X_MCAN_TOCV 0x102C > +#define TCAN4X5X_MCAN_ECR 0x1040 > +#define TCAN4X5X_MCAN_PSR 0x1044 > +#define TCAN4X5X_MCAN_TDCR 0x1048 > +#define TCAN4X5X_MCAN_INT_FLAG 0x1050 > +#define TCAN4X5X_MCAN_INT_EN 0x1054 > +#define TCAN4X5X_MCAN_ILS 0x1058 > +#define TCAN4X5X_MCAN_ILE 0x105C > +#define TCAN4X5X_MCAN_GFC 0x1080 > +#define TCAN4X5X_MCAN_SIDFC 0x1084 > +#define TCAN4X5X_MCAN_XIDFC 0x1088 > +#define TCAN4X5X_MCAN_XIDAM 0x1090 > +#define TCAN4X5X_MCAN_HPMS 0x1094 > +#define TCAN4X5X_MCAN_NDAT1 0x1098 > +#define TCAN4X5X_MCAN_NDAT2 0x109C > +#define TCAN4X5X_MCAN_RXF0C 0x10A0 > +#define TCAN4X5X_MCAN_RXF0S 0x10A4 > +#define TCAN4X5X_MCAN_RXF0A 0x10A8 > +#define TCAN4X5X_MCAN_RXBC 0x10AC > +#define TCAN4X5X_MCAN_RXF1C 0x10B0 > +#define TCAN4X5X_MCAN_RXF1S 0x10B4 > +#define TCAN4X5X_MCAN_RXF1A 0x10B8 > +#define TCAN4X5X_MCAN_RXESC 0x10BC > +#define TCAN4X5X_MCAN_TXBC 0x10C0 > +#define TCAN4X5X_MCAN_TXFQS 0x10C4 > +#define TCAN4X5X_MCAN_TXESC 0x10C8 > +#define TCAN4X5X_MCAN_TXBRP 0x10CC > +#define TCAN4X5X_MCAN_TXBAR 0x10D0 > +#define TCAN4X5X_MCAN_TXBCR 0x10D4 > +#define TCAN4X5X_MCAN_TXBTO 0x10D8 > +#define TCAN4X5X_MCAN_TXBCF 0x10DC > +#define TCAN4X5X_MCAN_TXBTIE 0x10E0 > +#define TCAN4X5X_MCAN_TXBCIE 0x10E4 > +#define TCAN4X5X_MCAN_TXEFC 0x10F0 > +#define TCAN4X5X_MCAN_TXEFS 0x10F4 > +#define TCAN4X5X_MCAN_TXEFA 0x10F8 > + > +#define TCAN4X5X_MRAM_START 0x8000 > +#define TCAN4X5X_MRAM_SIZE 2048 > + > +#define TCAN4X5X_MAX_REGISTER 0x8fff > + > +/* 64 byte buffer + 8 byte MCAN header */ > +#define TCAN4X5X_BUF_LEN 72 > + > +struct tcan4x5x_priv { > + struct can_priv can; > + struct net_device *net; > + struct regmap *regmap; > + struct spi_device *spi; > + > + struct mutex tcan4x5x_lock; /* SPI device lock */ > + > + struct gpio_desc *reset_gpio; > + struct gpio_desc *interrupt_gpio; > + struct gpio_desc *wake_gpio; > + struct regulator *power; > + struct clk *clk; > + > + struct sk_buff *tx_skb; > + int tx_len; > + > + struct workqueue_struct *wq; > + struct work_struct tx_work; > + struct work_struct restart_work; > + > + u32 *spi_tx_buf; > + u32 *spi_rx_buf; > + > + int force_quit; > + int after_suspend; > +#define AFTER_SUSPEND_UP 1 > +#define AFTER_SUSPEND_DOWN 2 > +#define AFTER_SUSPEND_POWER 4 > +#define AFTER_SUSPEND_RESTART 8 > + int restart_tx; > + > + int irq; > +}; > -- ------------------ Dan Murphy ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel 2018-09-26 17:40 ` Dan Murphy @ 2018-09-26 17:54 ` Wolfgang Grandegger 2018-09-26 18:00 ` Dan Murphy 2018-10-04 20:26 ` Dan Murphy 0 siblings, 2 replies; 10+ messages in thread From: Wolfgang Grandegger @ 2018-09-26 17:54 UTC (permalink / raw) To: Dan Murphy, mkl, davem; +Cc: linux-can, netdev, linux-kernel Hello, I wonder why you do not extend the existing MCAN driver by implementing an interface to access the hardware. Would that be feasible? Wolfgang. Am 26.09.2018 um 19:40 schrieb Dan Murphy: > bump > > On 09/10/2018 03:12 PM, Dan Murphy wrote: >> Add the TCAN4x5x SPI CAN driver. This device >> uses the Bosch MCAN IP core along with a SPI >> interface map. The register and data are >> 32 bits wide. >> >> Signed-off-by: Dan Murphy <dmurphy@ti.com> >> --- >> drivers/net/can/spi/Kconfig | 5 + >> drivers/net/can/spi/Makefile | 1 + >> drivers/net/can/spi/tcan4x5x.c | 1206 ++++++++++++++++++++++++++++++++ >> drivers/net/can/spi/tcan4x5x.h | 109 +++ >> 4 files changed, 1321 insertions(+) >> create mode 100644 drivers/net/can/spi/tcan4x5x.c >> create mode 100644 drivers/net/can/spi/tcan4x5x.h >> >> diff --git a/drivers/net/can/spi/Kconfig b/drivers/net/can/spi/Kconfig >> index 8f2e0dd7b756..8cac6ce37506 100644 >> --- a/drivers/net/can/spi/Kconfig >> +++ b/drivers/net/can/spi/Kconfig >> @@ -13,4 +13,9 @@ config CAN_MCP251X >> ---help--- >> Driver for the Microchip MCP251x SPI CAN controllers. >> >> +config CAN_TCAN4X5X >> + tristate "Texas Instruments TCAN4X5X SPI CAN controllers" >> + depends on HAS_DMA >> + ---help--- >> + Driver for the Texas Instruments TCAN4X5X SPI CAN controllers. >> endmenu >> diff --git a/drivers/net/can/spi/Makefile b/drivers/net/can/spi/Makefile >> index f59fa3731073..8ecaace7a920 100644 >> --- a/drivers/net/can/spi/Makefile >> +++ b/drivers/net/can/spi/Makefile >> @@ -5,3 +5,4 @@ >> >> obj-$(CONFIG_CAN_HI311X) += hi311x.o >> obj-$(CONFIG_CAN_MCP251X) += mcp251x.o >> +obj-$(CONFIG_CAN_TCAN4X5X) += tcan4x5x.o >> diff --git a/drivers/net/can/spi/tcan4x5x.c b/drivers/net/can/spi/tcan4x5x.c >> new file mode 100644 >> index 000000000000..ca3753efe35a >> --- /dev/null >> +++ b/drivers/net/can/spi/tcan4x5x.c >> @@ -0,0 +1,1206 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +// SPI to CAN driver for the Texas Instruments TCAN4x5x >> +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ >> + >> +#include <linux/can/core.h> >> +#include <linux/can/dev.h> >> +#include <linux/can/led.h> >> +#include <linux/clk.h> >> +#include <linux/completion.h> >> +#include <linux/delay.h> >> +#include <linux/device.h> >> +#include <linux/dma-mapping.h> >> +#include <linux/freezer.h> >> +#include <linux/interrupt.h> >> +#include <linux/io.h> >> +#include <linux/kernel.h> >> +#include <linux/module.h> >> +#include <linux/netdevice.h> >> +#include <linux/of.h> >> +#include <linux/of_device.h> >> +#include <linux/regmap.h> >> +#include <linux/slab.h> >> +#include <linux/spi/spi.h> >> +#include <linux/uaccess.h> >> + >> +#include <linux/regulator/consumer.h> >> +#include <linux/gpio/consumer.h> >> + >> +#include "tcan4x5x.h" >> + >> +#define DEVICE_NAME "tcan4x5x" >> +#define TCAN4X5X_EXT_CLK_DEF 40000000 >> + >> +#define TCAN4X5X_CLEAR_ALL_INT 0xffffffff >> +#define TCAN4X5X_SET_ALL_INT 0xffffffff >> + >> +#define TCAN4X5X_TX_ECHO_SKB_MAX 1 >> +#define TCAN4X5X_DATA_PKT_OFF 2 >> +#define TCAN4X5X_WRITE_CMD (0x61 << 24) >> +#define TCAN4X5X_READ_CMD (0x41 << 24) >> + >> +#define TCAN4X5X_SID_SHIFT 18 >> +#define TCAN4X5X_DLC_SHIFT 16 >> + >> +#define TCAN4X5X_ESI_SHIFT 31 >> +#define TCAN4X5X_XTD_SHIFT 30 >> +#define TCAN4X5X_RTR_SHIFT 29 >> +#define TCAN4X5X_FDF_SHIFT 21 >> +#define TCAN4X5X_BRS_SHIFT 20 >> +#define TCAN4X5X_DLC_SHIFT 16 >> + >> +#define TCAN4X5X_ESI_MASK BIT(31) >> +#define TCAN4X5X_XTD_MASK BIT(30) >> +#define TCAN4X5X_RTR_MASK BIT(29) >> + >> +#define TCAN4X5X_DLC_MASK 0xf0000 >> +#define TCAN4X5X_SW_RESET BIT(2) >> + >> +#define TCAN4X5X_MODE_SEL_MASK (BIT(7) | BIT(6)) >> +#define TCAN4X5X_MODE_SLEEP 0x00 >> +#define TCAN4X5X_MODE_STANDBY BIT(6) >> +#define TCAN4X5X_MODE_NORMAL BIT(7) >> +#define TCAN4X5X_MCAN_CONFIGURED BIT(5) >> +#define TCAN4X5X_WATCHDOG_EN BIT(3) >> +#define TCAN4X5X_WD_60_MS_TIMER 0 >> +#define TCAN4X5X_WD_600_MS_TIMER BIT(28) >> +#define TCAN4X5X_WD_3_S_TIMER BIT(29) >> +#define TCAN4X5X_WD_6_S_TIMER (BIT(28) | BIT(29)) >> + >> +/* Nominal Bit Timing & Prescaler Register */ >> +#define TCAN4X5X_NSJW_SHIFT 25 >> +#define TCAN4X5X_NBRP_SHIFT 16 >> +#define TCAN4X5X_NTSEG1_SHIFT 8 >> + >> +#define TCAN4X5X_TDCR_TDCO_SHIFT 8 >> + >> +/* Data Bit Timing & Prescaler Register (DBTP) */ >> +#define DBTP_TDC BIT(23) >> +#define DBTP_DBRP_SHIFT 16 >> +#define DBTP_DBRP_MASK (0x1f << DBTP_DBRP_SHIFT) >> +#define DBTP_DTSEG1_SHIFT 8 >> +#define DBTP_DTSEG1_MASK (0x1f << DBTP_DTSEG1_SHIFT) >> +#define DBTP_DTSEG2_SHIFT 4 >> +#define DBTP_DTSEG2_MASK (0xf << DBTP_DTSEG2_SHIFT) >> +#define DBTP_DSJW_SHIFT 0 >> +#define DBTP_DSJW_MASK (0xf << DBTP_DSJW_SHIFT) >> + >> +#define TCAN4x5x_QUEUE_LVL_MASK 0x1f >> +#define TCAN4x5x_QUEUE_IDX_SHIFT 16 >> +#define TCAN4x5x_QUEUE_IDX_MASK 0x1f00 >> + >> +#define TCAN4X5X_CANBUSNOM_INT_EN BIT(14) >> + >> +#define TCAN4X5X_NUM_TX_BUF 5 >> +#define TCAN4X5X_TX_QUEUE_SHIFT 24 >> +#define TCAN4X5X_TX_NDTB_SHIFT 16 >> +#define TCAN4X5X_TX_BUF_START 0x324 >> + >> +#define TCAN4X5X_NUM_RX_BUF 3 >> +#define TCAN4X5X_RX_WATER_MARK 2 >> +#define TCAN4X5X_RX_WATER_MARK_SHIFT 24 >> +#define TCAN4X5X_RX_FIFO_SZ_SHIFT 16 >> +#define TCAN4X5X_RX_BUF_START 0x4 >> + >> +#define TCAN4X5X_RX_F1DS_SHIFT 4 >> +#define TCAN4X5X_RX_RBDS_SHIFT 8 >> + >> +#define TCAN4X5X_RX_FIFO0_MESSAGE BIT(0) >> +#define TCAN4X5X_RX_FIFO1_MESSAGE BIT(4) >> +#define TCAN4X5X_RX_BUFFER_MESSAGE BIT(19) >> +#define TCAN4X5X_RX_INDEX_MASK 0x3f00 >> +#define TCAN4X5X_RX_INDEX_SHIFT 8 >> + >> +#define TCAN4X5X_RX_ADDR_OFFSET 0x8000 >> +#define TCAN4X5X_RX_BUF_ADDR_OFFSET 0x8100 >> +#define TCAN4X5X_RX_ADDR_MASK 0xffff >> + >> +#define TCAN4X5X_ERR_PROTOCOL_MASK 0x7 >> +#define TCAN4X5X_ERR_STUFERR 0x1 >> +#define TCAN4X5X_ERR_FRMERR 0x2 >> +#define TCAN4X5X_ERR_ACKERR 0x3 >> +#define TCAN4X5X_ERR_BIT1ERR 0x4 >> +#define TCAN4X5X_ERR_BIT0ERR 0x5 >> +#define TCAN4X5X_ERR_CRCERR 0x6 >> + >> +/* Interrupt bits */ >> +#define TCAN4X5X_CANBUSTERMOPEN_INT_EN BIT(30) >> +#define TCAN4X5X_CANHCANL_INT_EN BIT(29) >> +#define TCAN4X5X_CANHBAT_INT_EN BIT(28) >> +#define TCAN4X5X_CANLGND_INT_EN BIT(27) >> +#define TCAN4X5X_CANBUSOPEN_INT_EN BIT(26) >> +#define TCAN4X5X_CANBUSGND_INT_EN BIT(25) >> +#define TCAN4X5X_CANBUSBAT_INT_EN BIT(24) >> +#define TCAN4X5X_UVSUP_INT_EN BIT(22) >> +#define TCAN4X5X_UVIO_INT_EN BIT(21) >> +#define TCAN4X5X_TSD_INT_EN BIT(19) >> +#define TCAN4X5X_ECCERR_INT_EN BIT(16) >> +#define TCAN4X5X_CANINT_INT_EN BIT(15) >> +#define TCAN4X5X_LWU_INT_EN BIT(14) >> +#define TCAN4X5X_CANSLNT_INT_EN BIT(10) >> +#define TCAN4X5X_CANDOM_INT_EN BIT(8) >> +#define TCAN4X5X_CANBUS_ERR_INT_EN BIT(5) >> +#define TCAN4X5X_BUS_FAULT BIT(4) >> +#define TCAN4X5X_MCAN_INT BIT(1) >> +#define TCAN4X5X_ENABLE_ALL_INT (TCAN4X5X_MCAN_INT | \ >> + TCAN4X5X_BUS_FAULT | \ >> + TCAN4X5X_CANBUS_ERR_INT_EN | \ >> + TCAN4X5X_CANINT_INT_EN) >> + >> +/* MCAN Interrupt bits */ >> +#define TCAN4X5X_MCAN_IR_ARA BIT(29) >> +#define TCAN4X5X_MCAN_IR_PED BIT(28) >> +#define TCAN4X5X_MCAN_IR_PEA BIT(27) >> +#define TCAN4X5X_MCAN_IR_WD BIT(26) >> +#define TCAN4X5X_MCAN_IR_BO BIT(25) >> +#define TCAN4X5X_MCAN_IR_EW BIT(24) >> +#define TCAN4X5X_MCAN_IR_EP BIT(23) >> +#define TCAN4X5X_MCAN_IR_ELO BIT(22) >> +#define TCAN4X5X_MCAN_IR_BEU BIT(21) >> +#define TCAN4X5X_MCAN_IR_BEC BIT(20) >> +#define TCAN4X5X_MCAN_IR_DRX BIT(19) >> +#define TCAN4X5X_MCAN_IR_TOO BIT(18) >> +#define TCAN4X5X_MCAN_IR_MRAF BIT(17) >> +#define TCAN4X5X_MCAN_IR_TSW BIT(16) >> +#define TCAN4X5X_MCAN_IR_TEFL BIT(15) >> +#define TCAN4X5X_MCAN_IR_TEFF BIT(14) >> +#define TCAN4X5X_MCAN_IR_TEFW BIT(13) >> +#define TCAN4X5X_MCAN_IR_TEFN BIT(12) >> +#define TCAN4X5X_MCAN_IR_TFE BIT(11) >> +#define TCAN4X5X_MCAN_IR_TCF BIT(10) >> +#define TCAN4X5X_MCAN_IR_TC BIT(9) >> +#define TCAN4X5X_MCAN_IR_HPM BIT(8) >> +#define TCAN4X5X_MCAN_IR_RF1L BIT(7) >> +#define TCAN4X5X_MCAN_IR_RF1F BIT(6) >> +#define TCAN4X5X_MCAN_IR_RF1W BIT(5) >> +#define TCAN4X5X_MCAN_IR_RF1N BIT(4) >> +#define TCAN4X5X_MCAN_IR_RF0L BIT(3) >> +#define TCAN4X5X_MCAN_IR_RF0F BIT(2) >> +#define TCAN4X5X_MCAN_IR_RF0W BIT(1) >> +#define TCAN4X5X_MCAN_IR_RF0N BIT(0) >> +#define TCAN4X5X_ENABLE_MCAN_INT (TCAN4X5X_MCAN_IR_TC | \ >> + TCAN4X5X_MCAN_IR_RF0N | \ >> + TCAN4X5X_MCAN_IR_RF1N | \ >> + TCAN4X5X_MCAN_IR_RF0F | \ >> + TCAN4X5X_MCAN_IR_RF1F) >> + >> +/* CCR bits */ >> +#define TCAN4X5X_CCCR_NISO_BOSCH BIT(15) >> +#define TCAN4X5X_CCCR_TXP BIT(15) >> +#define TCAN4X5X_CCCR_EFBI BIT(13) >> +#define TCAN4X5X_CCCR_PXHD_DIS BIT(12) >> +#define TCAN4X5X_CCCR_BRSE BIT(9) >> +#define TCAN4X5X_CCCR_FDOE BIT(8) >> +#define TCAN4X5X_CCCR_TEST BIT(7) >> +#define TCAN4X5X_CCCR_DAR_DIS BIT(6) >> +#define TCAN4X5X_CCCR_MON BIT(5) >> +#define TCAN4X5X_CCCR_CSR BIT(4) >> +#define TCAN4X5X_CCCR_CSA BIT(3) >> +#define TCAN4X5X_CCCR_ASM BIT(2) >> +#define TCAN4X5X_CCCR_CCE BIT(1) >> +#define TCAN4X5X_CCCR_INIT BIT(0) >> + >> +#define TCAN4X5X_EINT0 BIT(0) >> +#define TCAN4X5X_EINT1 BIT(1) >> + >> +struct tcan4x5x_rx_regs { >> + u32 fifo_status_reg; >> + u32 fifo_config_reg; >> + u32 fifo_ack_reg; >> + u32 rx_buf_shift; >> +}; >> + >> +struct tcan4x5x_rx_regs tcan4x5x_fifo_regs[] = { >> + { TCAN4X5X_MCAN_RXF0S, TCAN4X5X_MCAN_RXF0C, TCAN4X5X_MCAN_RXF0A, 0}, >> + { TCAN4X5X_MCAN_RXF1S, TCAN4X5X_MCAN_RXF1C, TCAN4X5X_MCAN_RXF1A, 4}, >> + { TCAN4X5X_MCAN_NDAT1, TCAN4X5X_MCAN_RXBC, TCAN4X5X_MCAN_NDAT1, 8}, >> +}; >> + >> +enum tcan4x5x_data_size { >> + TCAN4X5X_8_BYTE = 0, >> + TCAN4X5X_12_BYTE, >> + TCAN4X5X_16_BYTE, >> + TCAN4X5X_20_BYTE, >> + TCAN4X5X_24_BYTE, >> + TCAN4X5X_32_BYTE, >> + TCAN4X5X_48_BYTE, >> + TCAN4X5X_64_BYTE, >> +}; >> + >> +static const struct can_bittiming_const tcan4x5x_bittiming_const = { >> + .name = DEVICE_NAME, >> + .tseg1_min = 2, >> + .tseg1_max = 31, >> + .tseg2_min = 2, >> + .tseg2_max = 16, >> + .sjw_max = 16, >> + .brp_min = 1, >> + .brp_max = 32, >> + .brp_inc = 1, >> +}; >> + >> +static const struct can_bittiming_const tcan4x5x_data_bittiming_const = { >> + .name = DEVICE_NAME, >> + .tseg1_min = 1, >> + .tseg1_max = 32, >> + .tseg2_min = 1, >> + .tseg2_max = 16, >> + .sjw_max = 16, >> + .brp_min = 1, >> + .brp_max = 32, >> + .brp_inc = 1, >> +}; >> + >> +static void tcan4x5x_clean(struct net_device *net) >> +{ >> + struct tcan4x5x_priv *priv = netdev_priv(net); >> + >> + if (priv->tx_skb || priv->tx_len) >> + net->stats.tx_errors++; >> + if (priv->tx_skb) >> + dev_kfree_skb(priv->tx_skb); >> + if (priv->tx_len) >> + can_free_echo_skb(priv->net, 0); >> + >> + priv->tx_skb = NULL; >> + priv->tx_len = 0; >> +} >> + >> +static int regmap_spi_gather_write(void *context, const void *reg, >> + size_t reg_len, const void *val, >> + size_t val_len) >> +{ >> + struct device *dev = context; >> + struct spi_device *spi = to_spi_device(dev); >> + u32 addr; >> + struct spi_message m; >> + struct spi_transfer t[2] = {{ .tx_buf = &addr, .len = 4, .cs_change = 0,}, >> + { .tx_buf = val, .len = val_len, },}; >> + >> + addr = TCAN4X5X_WRITE_CMD | (*((u16 *)reg) << 8) | val_len >> 2; >> + >> + spi_message_init(&m); >> + spi_message_add_tail(&t[0], &m); >> + spi_message_add_tail(&t[1], &m); >> + >> + return spi_sync(spi, &m); >> +} >> + >> +static int tcan4x5x_regmap_write(void *context, const void *data, size_t count) >> +{ >> + u16 *reg = (u16 *)(data); >> + const u32 *val = data + 2; >> + >> + return regmap_spi_gather_write(context, reg, 2, val, count - 2); >> +} >> + >> +static int regmap_spi_async_write(void *context, >> + const void *reg, size_t reg_len, >> + const void *val, size_t val_len, >> + struct regmap_async *a) >> +{ >> + return -ENOTSUPP; >> +} >> + >> +static struct regmap_async *regmap_spi_async_alloc(void) >> +{ >> + return NULL; >> +} >> + >> +static int tcan4x5x_regmap_read(void *context, >> + const void *reg, size_t reg_size, >> + void *val, size_t val_size) >> +{ >> + struct device *dev = context; >> + struct spi_device *spi = to_spi_device(dev); >> + >> + u32 addr = TCAN4X5X_READ_CMD | (*((u16 *)reg) << 8) | val_size >> 2; >> + >> + return spi_write_then_read(spi, &addr, 4, val, val_size); >> +} >> + >> +static struct regmap_bus tcan4x5x_bus = { >> + .write = tcan4x5x_regmap_write, >> + .gather_write = regmap_spi_gather_write, >> + .async_write = regmap_spi_async_write, >> + .async_alloc = regmap_spi_async_alloc, >> + .read = tcan4x5x_regmap_read, >> + .read_flag_mask = 0x00, >> + .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, >> + .val_format_endian_default = REGMAP_ENDIAN_NATIVE, >> +}; >> + >> +static uint8_t tcan4x5x_dlc_conv(uint8_t input) >> +{ >> + const static u8 lookup[7] = {12, 16, 20, 24, 32, 48, 64}; >> + >> + if (input < 9) >> + return input; >> + >> + if (input < 16) >> + return lookup[(unsigned int)(input - 9)]; >> + >> + return 0; >> +} >> + >> +static uint8_t tcan4x5x_txrxesc_value(uint8_t input) >> +{ >> + const u8 lookup[8] = {8, 12, 16, 20, 24, 32, 48, 64}; >> + return lookup[(unsigned int)(input & 0x07)]; >> +} >> + >> +static void tcan4x5x_hw_tx(struct tcan4x5x_priv *tcan4x5x) >> +{ >> + u32 sid, eid, exide, rtr, brs, esi, fdf, xtd, data_len; >> + u32 mcan_address, mcan_tx_element_sz; >> + int queue_stat, queue_lvl, queue_idx; >> + struct canfd_frame *fd_frame; >> + struct can_frame *frame; >> + int tx_element_sz, i, temp; >> + canid_t frame_id; >> + u8 dlc_len; >> + >> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXFQS, &queue_stat); >> + queue_lvl = queue_stat & TCAN4x5x_QUEUE_LVL_MASK; >> + queue_idx = (queue_stat & TCAN4x5x_QUEUE_IDX_MASK) >> TCAN4x5x_QUEUE_IDX_SHIFT; >> + >> + if (tcan4x5x->tx_skb->len == CAN_MTU) { >> + fd_frame = NULL; >> + frame = (struct can_frame *)tcan4x5x->tx_skb->data; >> + frame_id = frame->can_id; >> + dlc_len = frame->can_dlc; >> + data_len = ((dlc_len % 4) + dlc_len) / 4; >> + brs = 0; >> + } else if (tcan4x5x->tx_skb->len == CANFD_MTU) { >> + frame = NULL; >> + fd_frame = (struct canfd_frame *)tcan4x5x->tx_skb->data; >> + frame_id = fd_frame->can_id; >> + dlc_len = fd_frame->len; >> + data_len = ((dlc_len % 4) + dlc_len) / 4; >> + brs = fd_frame->flags & CANFD_BRS; >> + esi = fd_frame->flags & CANFD_ESI; >> + fdf = 1; >> + } else { >> + return; >> + } >> + >> + eid = frame_id & CAN_EFF_MASK; >> + rtr = (frame_id & CAN_RTR_FLAG) ? 1 : 0; >> + >> + exide = (frame_id & CAN_EFF_FLAG) ? 1 : 0; >> + if (exide) { >> + sid = frame_id & CAN_EFF_MASK; >> + xtd = 1; >> + } else { >> + sid = (frame_id & CAN_SFF_MASK) << TCAN4X5X_SID_SHIFT; >> + xtd = 0; >> + } >> + >> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBC, &mcan_address); >> + >> + mcan_address = (mcan_address & 0xffff) + TCAN4X5X_MRAM_START; >> + temp = (uint8_t)((mcan_address >> 24) & 0x3F); >> + >> + tx_element_sz = temp > 32 ? 32 : temp; >> + temp = (uint8_t)((mcan_address >> 16) & 0x3F); >> + >> + tx_element_sz += temp > 32 ? 32 : temp; >> + mcan_address += ((uint32_t)tx_element_sz * queue_idx); >> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXESC, &mcan_tx_element_sz); >> + tx_element_sz = tcan4x5x_txrxesc_value(mcan_tx_element_sz & 0x07) + 8; >> + mcan_address += ((uint32_t)tx_element_sz * 0); >> + >> + tx_element_sz = (tcan4x5x_dlc_conv(dlc_len & 0x0F) + 8) >> 2; >> + if (tcan4x5x_dlc_conv(dlc_len & 0x0F) % 4) >> + tx_element_sz += 1; >> + >> + tcan4x5x->spi_tx_buf[0] = esi << TCAN4X5X_ESI_SHIFT | >> + xtd << TCAN4X5X_XTD_SHIFT | >> + rtr << TCAN4X5X_RTR_SHIFT | sid; >> + >> + tcan4x5x->spi_tx_buf[1] = fdf << TCAN4X5X_FDF_SHIFT | >> + brs << TCAN4X5X_BRS_SHIFT | dlc_len << TCAN4X5X_DLC_SHIFT; >> + >> + if (tcan4x5x->tx_skb->len == CAN_MTU) >> + memcpy(tcan4x5x->spi_tx_buf + TCAN4X5X_DATA_PKT_OFF, >> + frame->data, dlc_len); >> + else >> + memcpy(tcan4x5x->spi_tx_buf + TCAN4X5X_DATA_PKT_OFF, >> + fd_frame->data, dlc_len); >> + >> + for (i = dlc_len + 1; i < TCAN4X5X_BUF_LEN / 4; i++) >> + tcan4x5x->spi_tx_buf[i] = 0; >> + >> + regmap_bulk_write(tcan4x5x->regmap, mcan_address, tcan4x5x->spi_tx_buf, >> + TCAN4X5X_BUF_LEN); >> + >> + regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBAR, (1 << (queue_idx))); >> +} >> + >> +int tcan4x5x_hw_rx(struct tcan4x5x_priv *tcan4x5x) >> +{ >> + u32 queue_idx, fifo_idx, fifo_start_addr, rx_buf_size, msg_type; >> + u32 data_buffer[TCAN4X5X_BUF_LEN] = {0x0}; >> + u32 rx_header[2] = {0x0}; >> + struct tcan4x5x_rx_regs *buffer_regs; >> + struct canfd_frame *fd_frame; >> + int dlc_len, data_len; >> + struct sk_buff *skb; >> + >> + skb = alloc_canfd_skb(tcan4x5x->net, &fd_frame); >> + if (!skb) { >> + dev_err(&tcan4x5x->spi->dev, "cannot allocate RX skb\n"); >> + tcan4x5x->net->stats.rx_dropped++; >> + return -ENOMEM; >> + } >> + >> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, &msg_type); >> + if (msg_type & TCAN4X5X_RX_FIFO0_MESSAGE) { >> + buffer_regs = &tcan4x5x_fifo_regs[0]; >> + } else if (msg_type & TCAN4X5X_RX_FIFO1_MESSAGE) { >> + buffer_regs = &tcan4x5x_fifo_regs[1]; >> + } else if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) { >> + buffer_regs = &tcan4x5x_fifo_regs[2]; >> + } else { >> + buffer_regs = NULL; >> + return -EINVAL; >> + } >> + >> + rx_buf_size = TCAN4X5X_BUF_LEN; >> + >> + /* Determine which FIFO needs service */ >> + regmap_read(tcan4x5x->regmap, buffer_regs->fifo_status_reg, &fifo_idx); >> + if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) >> + queue_idx = fifo_idx - 1; >> + else >> + queue_idx = (TCAN4X5X_RX_INDEX_MASK & fifo_idx) >> TCAN4X5X_RX_INDEX_SHIFT; >> + >> + /* Calculate the FIFO start address to service */ >> + regmap_read(tcan4x5x->regmap, buffer_regs->fifo_config_reg, &fifo_start_addr); >> + fifo_start_addr = (TCAN4X5X_RX_ADDR_MASK & fifo_start_addr); >> + if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) >> + fifo_start_addr = fifo_start_addr + TCAN4X5X_RX_BUF_ADDR_OFFSET + >> + (rx_buf_size * queue_idx); >> + else >> + fifo_start_addr = fifo_start_addr + TCAN4X5X_RX_ADDR_OFFSET + >> + (rx_buf_size * queue_idx); >> + >> + regmap_bulk_read(tcan4x5x->regmap, fifo_start_addr, rx_header, 2); >> + >> + dlc_len = (rx_header[1] & TCAN4X5X_DLC_MASK) >> TCAN4X5X_DLC_SHIFT; >> + if (dlc_len <= 8) >> + data_len = dlc_len; >> + else >> + data_len = tcan4x5x_txrxesc_value(dlc_len); >> + >> + regmap_bulk_read(tcan4x5x->regmap, fifo_start_addr + 8, >> + data_buffer, data_len / 4); >> + >> + /* Acknowledge receipt of the data */ >> + regmap_write(tcan4x5x->regmap, buffer_regs->fifo_ack_reg, queue_idx); >> + >> + if (rx_header[0] & TCAN4X5X_XTD_MASK) { >> + fd_frame->can_id = CAN_EFF_FLAG; >> + fd_frame->can_id |= (rx_header[0] & CAN_EFF_MASK); >> + } else { >> + fd_frame->can_id |= ((rx_header[0] >> TCAN4X5X_SID_SHIFT) & >> + CAN_SFF_MASK); >> + } >> + >> + if (rx_header[0] & TCAN4X5X_RTR_MASK) >> + fd_frame->can_id |= CAN_RTR_FLAG; >> + >> + if (rx_header[0] & TCAN4X5X_ESI_MASK) { >> + fd_frame->can_id |= CAN_ERR_FLAG; >> + fd_frame->flags |= CANFD_ESI; >> + netdev_dbg(tcan4x5x->net, "ESI Error\n"); >> + } >> + >> + fd_frame->len = data_len; >> + memcpy(fd_frame->data, data_buffer, fd_frame->len); >> + >> + tcan4x5x->net->stats.rx_packets++; >> + tcan4x5x->net->stats.rx_bytes += fd_frame->len; >> + >> + can_led_event(tcan4x5x->net, CAN_LED_EVENT_RX); >> + netif_rx_ni(skb); >> + >> + return 0; >> +} >> + >> +static void tcan4x5x_sleep(struct spi_device *spi) >> +{ >> + struct tcan4x5x_priv *tcan4x5x = spi_get_drvdata(spi); >> + >> + regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, >> + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_STANDBY); >> +} >> + >> +static int tcan4x5x_reset(struct net_device *net) >> +{ >> + struct tcan4x5x_priv *tcan4x5x = netdev_priv(net); >> + >> + if (tcan4x5x->reset_gpio) { >> + gpiod_set_value_cansleep(tcan4x5x->reset_gpio, 1); >> + udelay(10); >> + gpiod_set_value_cansleep(tcan4x5x->reset_gpio, 0); >> + } else { >> + regmap_write(tcan4x5x->regmap, TCAN4X5X_CONFIG, >> + TCAN4X5X_SW_RESET); >> + } >> + >> + return 0; >> +} >> + >> +static int tcan4x5x_power_enable(struct regulator *reg, int enable) >> +{ >> + if (IS_ERR_OR_NULL(reg)) >> + return 0; >> + >> + if (enable) >> + return regulator_enable(reg); >> + else >> + return regulator_disable(reg); >> +} >> + >> +static irqreturn_t tcan4x5x_can_ist(int irq, void *dev_id) >> +{ >> + struct tcan4x5x_priv *tcan4x5x = dev_id; >> + struct spi_device *spi = tcan4x5x->spi; >> + struct net_device *net = tcan4x5x->net; >> + enum can_state new_state; >> + int intf, eflag, mcan_intf; >> + >> + mutex_lock(&tcan4x5x->tcan4x5x_lock); >> + >> + regmap_read(tcan4x5x->regmap, TCAN4X5X_INT_FLAGS, &intf); >> + if (intf & TCAN4X5X_MCAN_INT) >> + tcan4x5x_hw_rx(tcan4x5x); >> + >> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, &mcan_intf); >> + >> + regmap_read(tcan4x5x->regmap, TCAN4X5X_STATUS, &eflag); >> + /* Update can state */ >> + if (eflag & TCAN4X5X_MCAN_IR_BO) >> + new_state = CAN_STATE_BUS_OFF; >> + else if (eflag & TCAN4X5X_MCAN_IR_EP) >> + new_state = CAN_STATE_ERROR_PASSIVE; >> + else if (eflag & TCAN4X5X_MCAN_IR_EW) >> + new_state = CAN_STATE_ERROR_WARNING; >> + else >> + new_state = CAN_STATE_ERROR_ACTIVE; >> + >> + if (new_state != tcan4x5x->can.state) { >> + struct can_frame *cf; >> + struct sk_buff *skb; >> + enum can_state rx_state, tx_state; >> + u32 error_count; >> + >> + skb = alloc_can_err_skb(net, &cf); >> + if (!skb) >> + goto ist_out; >> + >> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_ECR, &error_count); >> + cf->data[6] = error_count & 0xff; >> + cf->data[7] = error_count & 0x7f00 >> 8; >> + tx_state = cf->data[6] >= cf->data[7] ? new_state : 0; >> + rx_state = cf->data[6] <= cf->data[7] ? new_state : 0; >> + can_change_state(net, cf, tx_state, rx_state); >> + netif_rx_ni(skb); >> + >> + if (new_state == CAN_STATE_BUS_OFF) { >> + can_bus_off(net); >> + if (tcan4x5x->can.restart_ms == 0) { >> + tcan4x5x->force_quit = 1; >> + tcan4x5x_sleep(spi); >> + goto ist_out; >> + } >> + } >> + } >> + >> + /* Update bus errors */ >> + if ((intf & TCAN4X5X_BUS_FAULT) && >> + (tcan4x5x->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) { >> + struct can_frame *cf; >> + struct sk_buff *skb; >> + u32 psr_err, error_count; >> + >> + /* Check for protocol errors */ >> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_PSR, &psr_err); >> + if (psr_err & TCAN4X5X_ERR_PROTOCOL_MASK) { >> + skb = alloc_can_err_skb(net, &cf); >> + if (!skb) >> + goto ist_out; >> + >> + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; >> + tcan4x5x->can.can_stats.bus_error++; >> + tcan4x5x->net->stats.rx_errors++; >> + if (psr_err & TCAN4X5X_ERR_BIT0ERR) >> + cf->data[2] |= CAN_ERR_PROT_BIT0; >> + else if (psr_err & TCAN4X5X_ERR_BIT1ERR) >> + cf->data[2] |= CAN_ERR_PROT_BIT1; >> + else if (psr_err & TCAN4X5X_ERR_FRMERR) >> + cf->data[2] |= CAN_ERR_PROT_FORM; >> + else if (psr_err & TCAN4X5X_ERR_STUFERR) >> + cf->data[2] |= CAN_ERR_PROT_STUFF; >> + else if (psr_err & TCAN4X5X_ERR_CRCERR) >> + cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; >> + else if (psr_err & TCAN4X5X_ERR_ACKERR) >> + cf->data[3] |= CAN_ERR_PROT_LOC_ACK; >> + >> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_ECR, >> + &error_count); >> + cf->data[6] = error_count & 0xff; >> + cf->data[7] = error_count & 0x7f00 >> 8; >> + netdev_dbg(tcan4x5x->net, "Bus Error\n"); >> + netif_rx_ni(skb); >> + } >> + } >> + >> + if (mcan_intf & TCAN4X5X_MCAN_IR_TC) { >> + net->stats.tx_packets++; >> + net->stats.tx_bytes += tcan4x5x->tx_len - 1; >> + can_led_event(net, CAN_LED_EVENT_TX); >> + if (tcan4x5x->tx_len) { >> + can_get_echo_skb(net, 0); >> + tcan4x5x->tx_len = 0; >> + } >> + netif_wake_queue(net); >> + } >> + >> +ist_out: >> + regmap_write(tcan4x5x->regmap, TCAN4X5X_INT_FLAGS, TCAN4X5X_CLEAR_ALL_INT); >> + regmap_write(tcan4x5x->regmap, TCAN4X5X_STATUS, TCAN4X5X_CLEAR_ALL_INT); >> + regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, >> + TCAN4X5X_CLEAR_ALL_INT); >> + >> + mutex_unlock(&tcan4x5x->tcan4x5x_lock); >> + return IRQ_HANDLED; >> +} >> + >> +static int tcan4x5x_do_set_bittiming(struct net_device *net) >> +{ >> + struct tcan4x5x_priv *priv = netdev_priv(net); >> + struct can_bittiming *bt = &priv->can.bittiming; >> + struct can_bittiming *dbt = &priv->can.data_bittiming; >> + u16 brp, sjw, tseg1, tseg2; >> + int ret; >> + u32 val; >> + >> + brp = bt->brp - 1; >> + sjw = bt->sjw - 1; >> + tseg1 = bt->prop_seg + bt->phase_seg1 - 1; >> + tseg2 = bt->phase_seg2 - 1; >> + val = (brp << TCAN4X5X_NBRP_SHIFT) | (sjw << TCAN4X5X_NSJW_SHIFT) | >> + (tseg1 << TCAN4X5X_NTSEG1_SHIFT) | tseg2; >> + >> + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_NBTP, val); >> + if (ret) >> + return -EIO; >> + >> + if (priv->can.ctrlmode & CAN_CTRLMODE_FD) { >> + val = 0; >> + brp = dbt->brp - 1; >> + sjw = dbt->sjw - 1; >> + tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1; >> + tseg2 = dbt->phase_seg2 - 1; >> + >> + /* TDC is only needed for bitrates beyond 2.5 MBit/s. >> + * This is mentioned in the "Bit Time Requirements for CAN FD" >> + * paper presented at the International CAN Conference 2013 >> + */ >> + if (dbt->bitrate > 2500000) { >> + u32 tdco, ssp; >> + >> + /* Use the same value of secondary sampling point >> + * as the data sampling point >> + */ >> + ssp = dbt->sample_point; >> + >> + /* Equation based on Bosch's M_CAN User Manual's >> + * Transmitter Delay Compensation Section >> + */ >> + tdco = (priv->can.clock.freq / 1000) * >> + ssp / dbt->bitrate; >> + >> + /* Max valid TDCO value is 127 */ >> + if (tdco > 127) { >> + netdev_warn(net, "TDCO value of %u is beyond maximum. Using maximum possible value\n", >> + tdco); >> + tdco = 127; >> + } >> + >> + val |= DBTP_TDC; >> + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_TDCR, >> + tdco << TCAN4X5X_TDCR_TDCO_SHIFT); >> + if (ret) >> + return -EIO; >> + } >> + >> + val |= (brp << DBTP_DBRP_SHIFT) | >> + (sjw << DBTP_DSJW_SHIFT) | >> + (tseg1 << DBTP_DTSEG1_SHIFT) | >> + (tseg2 << DBTP_DTSEG2_SHIFT); >> + >> + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_DBTP, val); >> + } >> + >> + return ret; >> +} >> + >> +static int tcan4x5x_setup(struct spi_device *spi) >> +{ >> + struct tcan4x5x_priv *tcan4x5x = spi_get_drvdata(spi); >> + int start_reg = TCAN4X5X_MRAM_START; >> + int end_reg = start_reg + TCAN4X5X_MRAM_SIZE; >> + int ret; >> + >> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_REG, >> + TCAN4X5X_CLEAR_ALL_INT); >> + if (ret) >> + return -EIO; >> + >> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_EN, >> + TCAN4X5X_ENABLE_MCAN_INT); >> + if (ret) >> + return -EIO; >> + >> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_CCCR, >> + TCAN4X5X_CCCR_INIT | TCAN4X5X_CCCR_CCE); >> + if (ret) >> + return -EIO; >> + >> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_CCCR, >> + TCAN4X5X_CCCR_INIT | TCAN4X5X_CCCR_CCE | >> + TCAN4X5X_CCCR_FDOE | TCAN4X5X_CCCR_BRSE); >> + if (ret) >> + return -EIO; >> + >> + ret = tcan4x5x_do_set_bittiming(tcan4x5x->net); >> + if (ret) >> + return -EIO; >> + >> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXESC, >> + TCAN4X5X_64_BYTE); >> + if (ret) >> + return -EIO; >> + >> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBC, >> + (TCAN4X5X_NUM_TX_BUF << TCAN4X5X_TX_QUEUE_SHIFT | >> + TCAN4X5X_TX_BUF_START)); >> + if (ret) >> + return -EIO; >> + >> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_RXF0C, >> + (TCAN4X5X_RX_WATER_MARK << TCAN4X5X_RX_WATER_MARK_SHIFT | >> + TCAN4X5X_NUM_RX_BUF << TCAN4X5X_RX_FIFO_SZ_SHIFT | >> + TCAN4X5X_RX_BUF_START)); >> + if (ret) >> + return -EIO; >> + >> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_RXESC, >> + (TCAN4X5X_64_BYTE << TCAN4X5X_RX_RBDS_SHIFT | >> + TCAN4X5X_64_BYTE << TCAN4X5X_RX_F1DS_SHIFT | >> + TCAN4X5X_64_BYTE)); >> + if (ret) >> + return -EIO; >> + >> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBTIE, >> + TCAN4X5X_SET_ALL_INT); >> + if (ret) >> + return -EIO; >> + >> + >> + ret = regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, >> + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_NORMAL); >> + if (ret) >> + return -EIO; >> + >> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_ILE, TCAN4X5X_EINT0); >> + if (ret) >> + return -EIO; >> + >> + /* Zero out the MCAN buffers */ >> + while (start_reg < end_reg) { >> + regmap_write(tcan4x5x->regmap, start_reg, 0); >> + start_reg += 4; >> + } >> + >> + return ret; >> +} >> + >> +static void tcan4x5x_tx_work_handler(struct work_struct *ws) >> +{ >> + struct tcan4x5x_priv *tcan4x5x = container_of(ws, struct tcan4x5x_priv, >> + tx_work); >> + struct net_device *net = tcan4x5x->net; >> + struct can_frame *frame; >> + >> + mutex_lock(&tcan4x5x->tcan4x5x_lock); >> + if (tcan4x5x->tx_skb) { >> + if (tcan4x5x->can.state == CAN_STATE_BUS_OFF) { >> + tcan4x5x_clean(net); >> + } else { >> + frame = (struct can_frame *)tcan4x5x->tx_skb->data; >> + tcan4x5x_hw_tx(tcan4x5x); >> + tcan4x5x->tx_len = 1 + frame->can_dlc; >> + can_put_echo_skb(tcan4x5x->tx_skb, net, 0); >> + tcan4x5x->tx_skb = NULL; >> + } >> + } >> + mutex_unlock(&tcan4x5x->tcan4x5x_lock); >> +} >> + >> +static void tcan4x5x_restart_work_handler(struct work_struct *ws) >> +{ >> + struct tcan4x5x_priv *tcan4x5x = container_of(ws, struct tcan4x5x_priv, >> + restart_work); >> + struct spi_device *spi = tcan4x5x->spi; >> + struct net_device *net = tcan4x5x->net; >> + >> + mutex_lock(&tcan4x5x->tcan4x5x_lock); >> + if (tcan4x5x->after_suspend) { >> + tcan4x5x_reset(net); >> + tcan4x5x_setup(spi); >> + if (tcan4x5x->after_suspend & AFTER_SUSPEND_RESTART) { >> + tcan4x5x_setup(spi); >> + } else if (tcan4x5x->after_suspend & AFTER_SUSPEND_UP) { >> + netif_device_attach(net); >> + tcan4x5x_clean(net); >> + tcan4x5x_setup(spi); >> + netif_wake_queue(net); >> + } else { >> + tcan4x5x_sleep(spi); >> + } >> + tcan4x5x->after_suspend = 0; >> + tcan4x5x->force_quit = 0; >> + } >> + >> + if (tcan4x5x->restart_tx) { >> + tcan4x5x->restart_tx = 0; >> + tcan4x5x_reset(net); >> + tcan4x5x_clean(net); >> + tcan4x5x_setup(spi); >> + netif_wake_queue(net); >> + } >> + mutex_unlock(&tcan4x5x->tcan4x5x_lock); >> +} >> + >> +static int tcan4x5x_open(struct net_device *net) >> +{ >> + struct tcan4x5x_priv *priv = netdev_priv(net); >> + struct spi_device *spi = priv->spi; >> + unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_LOW; >> + int ret; >> + >> + ret = open_candev(net); >> + if (ret) >> + return ret; >> + >> + mutex_lock(&priv->tcan4x5x_lock); >> + tcan4x5x_power_enable(priv->power, 1); >> + >> + priv->force_quit = 0; >> + priv->tx_skb = NULL; >> + priv->tx_len = 0; >> + >> + ret = request_threaded_irq(priv->irq, NULL, tcan4x5x_can_ist, >> + flags, DEVICE_NAME, priv); >> + if (ret) { >> + dev_err(&spi->dev, "failed to acquire irq %d %i\n", >> + priv->irq, ret); >> + goto out_close; >> + } >> + >> + priv->wq = alloc_workqueue("tcan4x5x_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM, >> + 0); >> + if (!priv->wq) { >> + ret = -ENOMEM; >> + goto out_free_irq; >> + } >> + >> + INIT_WORK(&priv->tx_work, tcan4x5x_tx_work_handler); >> + INIT_WORK(&priv->restart_work, tcan4x5x_restart_work_handler); >> + >> + priv->spi_tx_buf = devm_kzalloc(&spi->dev, TCAN4X5X_BUF_LEN, >> + GFP_KERNEL); >> + if (!priv->spi_tx_buf) { >> + ret = -ENOMEM; >> + goto out_free_wq; >> + } >> + >> + priv->spi_rx_buf = devm_kzalloc(&spi->dev, TCAN4X5X_BUF_LEN, >> + GFP_KERNEL); >> + if (!priv->spi_rx_buf) { >> + ret = -ENOMEM; >> + goto out_free_wq; >> + } >> + >> + if (priv->wake_gpio) >> + gpiod_set_value_cansleep(priv->wake_gpio, 1); >> + >> + ret = tcan4x5x_reset(net); >> + if (ret) >> + goto out_free_wq; >> + >> + ret = tcan4x5x_setup(spi); >> + if (ret) >> + goto out_free_wq; >> + >> + can_led_event(net, CAN_LED_EVENT_OPEN); >> + netif_wake_queue(net); >> + mutex_unlock(&priv->tcan4x5x_lock); >> + >> + return 0; >> + >> + out_free_wq: >> + destroy_workqueue(priv->wq); >> + out_free_irq: >> + free_irq(priv->irq, priv); >> + tcan4x5x_sleep(spi); >> + out_close: >> + tcan4x5x_power_enable(priv->power, 0); >> + close_candev(net); >> + mutex_unlock(&priv->tcan4x5x_lock); >> + return ret; >> +} >> + >> +static int tcan4x5x_stop(struct net_device *net) >> +{ >> + struct tcan4x5x_priv *priv = netdev_priv(net); >> + struct spi_device *spi = priv->spi; >> + >> + close_candev(net); >> + >> + priv->force_quit = 1; >> + free_irq(priv->irq, priv); >> + destroy_workqueue(priv->wq); >> + priv->wq = NULL; >> + >> + mutex_lock(&priv->tcan4x5x_lock); >> + >> + priv->can.state = CAN_STATE_STOPPED; >> + tcan4x5x_sleep(spi); >> + tcan4x5x_power_enable(priv->power, 0); >> + >> + mutex_unlock(&priv->tcan4x5x_lock); >> + >> + can_led_event(net, CAN_LED_EVENT_STOP); >> + >> + return 0; >> +} >> + >> +static netdev_tx_t tcan4x5x_hard_start_xmit(struct sk_buff *skb, >> + struct net_device *net) >> +{ >> + struct tcan4x5x_priv *priv = netdev_priv(net); >> + struct spi_device *spi = priv->spi; >> + >> + if (priv->tx_skb || priv->tx_len) { >> + dev_warn(&spi->dev, "hard_xmit called while tx busy\n"); >> + return NETDEV_TX_BUSY; >> + } >> + >> + if (can_dropped_invalid_skb(net, skb)) >> + return NETDEV_TX_OK; >> + >> + netif_stop_queue(net); >> + priv->tx_skb = skb; >> + queue_work(priv->wq, &priv->tx_work); >> + >> + return NETDEV_TX_OK; >> +} >> + >> +static int tcan4x5x_do_set_mode(struct net_device *net, enum can_mode mode) >> +{ >> + struct tcan4x5x_priv *priv = netdev_priv(net); >> + >> + switch (mode) { >> + case CAN_MODE_START: >> + tcan4x5x_clean(net); >> + priv->can.state = CAN_STATE_ERROR_ACTIVE; >> + priv->restart_tx = 1; >> + queue_work(priv->wq, &priv->restart_work); >> + break; >> + default: >> + return -EOPNOTSUPP; >> + } >> + >> + return 0; >> +} >> + >> +static const struct net_device_ops tcan4x5x_netdev_ops = { >> + .ndo_open = tcan4x5x_open, >> + .ndo_stop = tcan4x5x_stop, >> + .ndo_start_xmit = tcan4x5x_hard_start_xmit, >> + .ndo_change_mtu = can_change_mtu, >> +}; >> + >> +static int tcan4x5x_parse_config(struct tcan4x5x_priv *tcan4x5x) >> +{ >> + tcan4x5x->reset_gpio = devm_gpiod_get_optional(&tcan4x5x->spi->dev, >> + "reset", GPIOD_OUT_LOW); >> + if (IS_ERR(tcan4x5x->reset_gpio)) >> + tcan4x5x->reset_gpio = NULL; >> + >> + tcan4x5x->wake_gpio = devm_gpiod_get_optional(&tcan4x5x->spi->dev, >> + "wake-up", GPIOD_OUT_LOW); >> + if (IS_ERR(tcan4x5x->wake_gpio)) >> + tcan4x5x->wake_gpio = NULL; >> + >> + tcan4x5x->interrupt_gpio = devm_gpiod_get(&tcan4x5x->spi->dev, >> + "data-ready", GPIOD_IN); >> + if (IS_ERR(tcan4x5x->interrupt_gpio)) { >> + dev_err(&tcan4x5x->spi->dev, "data-ready gpio not defined\n"); >> + return -EINVAL; >> + } >> + >> + tcan4x5x->irq = gpiod_to_irq(tcan4x5x->interrupt_gpio); >> + >> + tcan4x5x->power = devm_regulator_get_optional(&tcan4x5x->spi->dev, >> + "vsup"); >> + if (PTR_ERR(tcan4x5x->power) == -EPROBE_DEFER) >> + return -EPROBE_DEFER; >> + >> + return 0; >> +} >> + >> +static const struct regmap_config tcan4x5x_regmap = { >> + .reg_bits = 16, >> + .val_bits = 32, >> + .cache_type = REGCACHE_NONE, >> + .max_register = TCAN4X5X_MAX_REGISTER, >> +}; >> + >> +static int tcan4x5x_can_probe(struct spi_device *spi) >> +{ >> + struct net_device *net; >> + struct tcan4x5x_priv *priv; >> + struct clk *clk; >> + int freq, ret; >> + >> + clk = devm_clk_get(&spi->dev, NULL); >> + if (IS_ERR(clk)) { >> + dev_err(&spi->dev, "no CAN clock source defined\n"); >> + freq = TCAN4X5X_EXT_CLK_DEF; >> + } else { >> + freq = clk_get_rate(clk); >> + } >> + >> + /* Sanity check */ >> + if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF) >> + return -ERANGE; >> + >> + /* Allocate can/net device */ >> + net = alloc_candev(sizeof(*priv), TCAN4X5X_TX_ECHO_SKB_MAX); >> + if (!net) >> + return -ENOMEM; >> + >> + if (!IS_ERR(clk)) { >> + ret = clk_prepare_enable(clk); >> + if (ret) >> + goto out_free; >> + } >> + >> + net->netdev_ops = &tcan4x5x_netdev_ops; >> + net->flags |= IFF_ECHO; >> + net->mtu = CANFD_MTU; >> + >> + priv = netdev_priv(net); >> + priv->can.bittiming_const = &tcan4x5x_bittiming_const; >> + priv->can.data_bittiming_const = &tcan4x5x_data_bittiming_const; >> + priv->can.do_set_mode = tcan4x5x_do_set_mode; >> + priv->can.clock.freq = freq; >> + priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | >> + CAN_CTRLMODE_LISTENONLY | >> + CAN_CTRLMODE_BERR_REPORTING | >> + CAN_CTRLMODE_FD | >> + CAN_CTRLMODE_FD_NON_ISO; >> + priv->net = net; >> + priv->spi = spi; >> + priv->clk = clk; >> + spi_set_drvdata(spi, priv); >> + >> + ret = tcan4x5x_parse_config(priv); >> + if (ret) >> + goto out_clk; >> + >> + /* Configure the SPI bus */ >> + spi->bits_per_word = 32; >> + ret = spi_setup(spi); >> + if (ret) >> + goto out_clk; >> + >> + mutex_init(&priv->tcan4x5x_lock); >> + >> + priv->regmap = devm_regmap_init(&spi->dev, &tcan4x5x_bus, >> + &spi->dev, &tcan4x5x_regmap); >> + >> + SET_NETDEV_DEV(net, &spi->dev); >> + ret = register_candev(net); >> + if (ret) >> + goto error_probe; >> + >> + devm_can_led_init(net); >> + >> + netdev_info(net, "TCAN4X5X successfully initialized.\n"); >> + return 0; >> + >> +error_probe: >> + tcan4x5x_power_enable(priv->power, 0); >> +out_clk: >> + if (!IS_ERR(clk)) >> + clk_disable_unprepare(clk); >> +out_free: >> + free_candev(net); >> + dev_err(&spi->dev, "Probe failed, err=%d\n", -ret); >> + return ret; >> +} >> + >> +static int tcan4x5x_can_remove(struct spi_device *spi) >> +{ >> + struct tcan4x5x_priv *priv = spi_get_drvdata(spi); >> + struct net_device *net = priv->net; >> + >> + unregister_candev(net); >> + >> + tcan4x5x_power_enable(priv->power, 0); >> + >> + if (!IS_ERR(priv->clk)) >> + clk_disable_unprepare(priv->clk); >> + >> + free_candev(net); >> + >> + return 0; >> +} >> + >> +static const struct of_device_id tcan4x5x_of_match[] = { >> + { .compatible = "ti,tcan4x5x", }, >> + { } >> +}; >> +MODULE_DEVICE_TABLE(of, tcan4x5x_of_match); >> + >> +static const struct spi_device_id tcan4x5x_id_table[] = { >> + { >> + .name = "tcan4x5x", >> + .driver_data = 0, >> + }, >> + { } >> +}; >> +MODULE_DEVICE_TABLE(spi, tcan4x5x_id_table); >> + >> +static struct spi_driver tcan4x5x_can_driver = { >> + .driver = { >> + .name = DEVICE_NAME, >> + .of_match_table = tcan4x5x_of_match, >> + .pm = NULL, >> + }, >> + .id_table = tcan4x5x_id_table, >> + .probe = tcan4x5x_can_probe, >> + .remove = tcan4x5x_can_remove, >> +}; >> +module_spi_driver(tcan4x5x_can_driver); >> + >> +MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); >> +MODULE_DESCRIPTION("Texas Instruments TCAN4x5x CAN driver"); >> +MODULE_LICENSE("GPL v2"); >> diff --git a/drivers/net/can/spi/tcan4x5x.h b/drivers/net/can/spi/tcan4x5x.h >> new file mode 100644 >> index 000000000000..5e14ba571d49 >> --- /dev/null >> +++ b/drivers/net/can/spi/tcan4x5x.h >> @@ -0,0 +1,109 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +// SPI to CAN driver for the Texas Instruments TCA4x5x >> +// Flash driver chip family >> +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ >> + >> +#define TCAN4X5X_DEV_ID0 0x00 >> +#define TCAN4X5X_DEV_ID1 0x04 >> +#define TCAN4X5X_REV 0x08 >> +#define TCAN4X5X_STATUS 0x0C >> +#define TCAN4X5X_ERROR_STATUS 0x10 >> +#define TCAN4X5X_CONTROL 0x14 >> + >> +#define TCAN4X5X_CONFIG 0x800 >> +#define TCAN4X5X_TS_PRESCALE 0x804 >> +#define TCAN4X5X_TEST_REG 0x808 >> +#define TCAN4X5X_INT_FLAGS 0x820 >> +#define TCAN4X5X_MCAN_INT_REG 0x824 >> +#define TCAN4X5X_INT_EN 0x830 >> + >> +#define TCAN4X5X_MCAN_CREL 0x1000 >> +#define TCAN4X5X_MCAN_ENDN 0x1004 >> +#define TCAN4X5X_MCAN_CUST 0x1008 >> +#define TCAN4X5X_MCAN_DBTP 0x100C >> +#define TCAN4X5X_MCAN_TEST 0x1010 >> +#define TCAN4X5X_MCAN_RWD 0x1014 >> +#define TCAN4X5X_MCAN_CCCR 0x1018 >> +#define TCAN4X5X_MCAN_NBTP 0x101C >> +#define TCAN4X5X_MCAN_TSCC 0x1020 >> +#define TCAN4X5X_MCAN_TSCV 0x1024 >> +#define TCAN4X5X_MCAN_TOCC 0x1028 >> +#define TCAN4X5X_MCAN_TOCV 0x102C >> +#define TCAN4X5X_MCAN_ECR 0x1040 >> +#define TCAN4X5X_MCAN_PSR 0x1044 >> +#define TCAN4X5X_MCAN_TDCR 0x1048 >> +#define TCAN4X5X_MCAN_INT_FLAG 0x1050 >> +#define TCAN4X5X_MCAN_INT_EN 0x1054 >> +#define TCAN4X5X_MCAN_ILS 0x1058 >> +#define TCAN4X5X_MCAN_ILE 0x105C >> +#define TCAN4X5X_MCAN_GFC 0x1080 >> +#define TCAN4X5X_MCAN_SIDFC 0x1084 >> +#define TCAN4X5X_MCAN_XIDFC 0x1088 >> +#define TCAN4X5X_MCAN_XIDAM 0x1090 >> +#define TCAN4X5X_MCAN_HPMS 0x1094 >> +#define TCAN4X5X_MCAN_NDAT1 0x1098 >> +#define TCAN4X5X_MCAN_NDAT2 0x109C >> +#define TCAN4X5X_MCAN_RXF0C 0x10A0 >> +#define TCAN4X5X_MCAN_RXF0S 0x10A4 >> +#define TCAN4X5X_MCAN_RXF0A 0x10A8 >> +#define TCAN4X5X_MCAN_RXBC 0x10AC >> +#define TCAN4X5X_MCAN_RXF1C 0x10B0 >> +#define TCAN4X5X_MCAN_RXF1S 0x10B4 >> +#define TCAN4X5X_MCAN_RXF1A 0x10B8 >> +#define TCAN4X5X_MCAN_RXESC 0x10BC >> +#define TCAN4X5X_MCAN_TXBC 0x10C0 >> +#define TCAN4X5X_MCAN_TXFQS 0x10C4 >> +#define TCAN4X5X_MCAN_TXESC 0x10C8 >> +#define TCAN4X5X_MCAN_TXBRP 0x10CC >> +#define TCAN4X5X_MCAN_TXBAR 0x10D0 >> +#define TCAN4X5X_MCAN_TXBCR 0x10D4 >> +#define TCAN4X5X_MCAN_TXBTO 0x10D8 >> +#define TCAN4X5X_MCAN_TXBCF 0x10DC >> +#define TCAN4X5X_MCAN_TXBTIE 0x10E0 >> +#define TCAN4X5X_MCAN_TXBCIE 0x10E4 >> +#define TCAN4X5X_MCAN_TXEFC 0x10F0 >> +#define TCAN4X5X_MCAN_TXEFS 0x10F4 >> +#define TCAN4X5X_MCAN_TXEFA 0x10F8 >> + >> +#define TCAN4X5X_MRAM_START 0x8000 >> +#define TCAN4X5X_MRAM_SIZE 2048 >> + >> +#define TCAN4X5X_MAX_REGISTER 0x8fff >> + >> +/* 64 byte buffer + 8 byte MCAN header */ >> +#define TCAN4X5X_BUF_LEN 72 >> + >> +struct tcan4x5x_priv { >> + struct can_priv can; >> + struct net_device *net; >> + struct regmap *regmap; >> + struct spi_device *spi; >> + >> + struct mutex tcan4x5x_lock; /* SPI device lock */ >> + >> + struct gpio_desc *reset_gpio; >> + struct gpio_desc *interrupt_gpio; >> + struct gpio_desc *wake_gpio; >> + struct regulator *power; >> + struct clk *clk; >> + >> + struct sk_buff *tx_skb; >> + int tx_len; >> + >> + struct workqueue_struct *wq; >> + struct work_struct tx_work; >> + struct work_struct restart_work; >> + >> + u32 *spi_tx_buf; >> + u32 *spi_rx_buf; >> + >> + int force_quit; >> + int after_suspend; >> +#define AFTER_SUSPEND_UP 1 >> +#define AFTER_SUSPEND_DOWN 2 >> +#define AFTER_SUSPEND_POWER 4 >> +#define AFTER_SUSPEND_RESTART 8 >> + int restart_tx; >> + >> + int irq; >> +}; >> > > ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel 2018-09-26 17:54 ` Wolfgang Grandegger @ 2018-09-26 18:00 ` Dan Murphy 2018-09-26 18:34 ` Wolfgang Grandegger 2018-10-04 20:26 ` Dan Murphy 1 sibling, 1 reply; 10+ messages in thread From: Dan Murphy @ 2018-09-26 18:00 UTC (permalink / raw) To: Wolfgang Grandegger, mkl, davem; +Cc: linux-can, netdev, linux-kernel Wolfgang On 09/26/2018 12:54 PM, Wolfgang Grandegger wrote: > Hello, > > I wonder why you do not extend the existing MCAN driver by implementing > an interface to access the hardware. Would that be feasible? > That did cross my mind. The issue is I have no way of testing the existing driver to make sure I did not break anything. My thought was to create a basic MCAN framework and attach the devices to it. So, like in this case, if there is a special way to talk to the device it can be handled in the device driver. If thats what is needed then I will have to re-write the driver. Dan > Wolfgang. > > Am 26.09.2018 um 19:40 schrieb Dan Murphy: >> bump >> >> On 09/10/2018 03:12 PM, Dan Murphy wrote: >>> Add the TCAN4x5x SPI CAN driver. This device >>> uses the Bosch MCAN IP core along with a SPI >>> interface map. The register and data are >>> 32 bits wide. >>> >>> Signed-off-by: Dan Murphy <dmurphy@ti.com> >>> --- >>> drivers/net/can/spi/Kconfig | 5 + >>> drivers/net/can/spi/Makefile | 1 + >>> drivers/net/can/spi/tcan4x5x.c | 1206 ++++++++++++++++++++++++++++++++ >>> drivers/net/can/spi/tcan4x5x.h | 109 +++ >>> 4 files changed, 1321 insertions(+) >>> create mode 100644 drivers/net/can/spi/tcan4x5x.c >>> create mode 100644 drivers/net/can/spi/tcan4x5x.h >>> >>> diff --git a/drivers/net/can/spi/Kconfig b/drivers/net/can/spi/Kconfig >>> index 8f2e0dd7b756..8cac6ce37506 100644 >>> --- a/drivers/net/can/spi/Kconfig >>> +++ b/drivers/net/can/spi/Kconfig >>> @@ -13,4 +13,9 @@ config CAN_MCP251X >>> ---help--- >>> Driver for the Microchip MCP251x SPI CAN controllers. >>> >>> +config CAN_TCAN4X5X >>> + tristate "Texas Instruments TCAN4X5X SPI CAN controllers" >>> + depends on HAS_DMA >>> + ---help--- >>> + Driver for the Texas Instruments TCAN4X5X SPI CAN controllers. >>> endmenu >>> diff --git a/drivers/net/can/spi/Makefile b/drivers/net/can/spi/Makefile >>> index f59fa3731073..8ecaace7a920 100644 >>> --- a/drivers/net/can/spi/Makefile >>> +++ b/drivers/net/can/spi/Makefile >>> @@ -5,3 +5,4 @@ >>> >>> obj-$(CONFIG_CAN_HI311X) += hi311x.o >>> obj-$(CONFIG_CAN_MCP251X) += mcp251x.o >>> +obj-$(CONFIG_CAN_TCAN4X5X) += tcan4x5x.o >>> diff --git a/drivers/net/can/spi/tcan4x5x.c b/drivers/net/can/spi/tcan4x5x.c >>> new file mode 100644 >>> index 000000000000..ca3753efe35a >>> --- /dev/null >>> +++ b/drivers/net/can/spi/tcan4x5x.c >>> @@ -0,0 +1,1206 @@ >>> +// SPDX-License-Identifier: GPL-2.0 >>> +// SPI to CAN driver for the Texas Instruments TCAN4x5x >>> +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ >>> + >>> +#include <linux/can/core.h> >>> +#include <linux/can/dev.h> >>> +#include <linux/can/led.h> >>> +#include <linux/clk.h> >>> +#include <linux/completion.h> >>> +#include <linux/delay.h> >>> +#include <linux/device.h> >>> +#include <linux/dma-mapping.h> >>> +#include <linux/freezer.h> >>> +#include <linux/interrupt.h> >>> +#include <linux/io.h> >>> +#include <linux/kernel.h> >>> +#include <linux/module.h> >>> +#include <linux/netdevice.h> >>> +#include <linux/of.h> >>> +#include <linux/of_device.h> >>> +#include <linux/regmap.h> >>> +#include <linux/slab.h> >>> +#include <linux/spi/spi.h> >>> +#include <linux/uaccess.h> >>> + >>> +#include <linux/regulator/consumer.h> >>> +#include <linux/gpio/consumer.h> >>> + >>> +#include "tcan4x5x.h" >>> + >>> +#define DEVICE_NAME "tcan4x5x" >>> +#define TCAN4X5X_EXT_CLK_DEF 40000000 >>> + >>> +#define TCAN4X5X_CLEAR_ALL_INT 0xffffffff >>> +#define TCAN4X5X_SET_ALL_INT 0xffffffff >>> + >>> +#define TCAN4X5X_TX_ECHO_SKB_MAX 1 >>> +#define TCAN4X5X_DATA_PKT_OFF 2 >>> +#define TCAN4X5X_WRITE_CMD (0x61 << 24) >>> +#define TCAN4X5X_READ_CMD (0x41 << 24) >>> + >>> +#define TCAN4X5X_SID_SHIFT 18 >>> +#define TCAN4X5X_DLC_SHIFT 16 >>> + >>> +#define TCAN4X5X_ESI_SHIFT 31 >>> +#define TCAN4X5X_XTD_SHIFT 30 >>> +#define TCAN4X5X_RTR_SHIFT 29 >>> +#define TCAN4X5X_FDF_SHIFT 21 >>> +#define TCAN4X5X_BRS_SHIFT 20 >>> +#define TCAN4X5X_DLC_SHIFT 16 >>> + >>> +#define TCAN4X5X_ESI_MASK BIT(31) >>> +#define TCAN4X5X_XTD_MASK BIT(30) >>> +#define TCAN4X5X_RTR_MASK BIT(29) >>> + >>> +#define TCAN4X5X_DLC_MASK 0xf0000 >>> +#define TCAN4X5X_SW_RESET BIT(2) >>> + >>> +#define TCAN4X5X_MODE_SEL_MASK (BIT(7) | BIT(6)) >>> +#define TCAN4X5X_MODE_SLEEP 0x00 >>> +#define TCAN4X5X_MODE_STANDBY BIT(6) >>> +#define TCAN4X5X_MODE_NORMAL BIT(7) >>> +#define TCAN4X5X_MCAN_CONFIGURED BIT(5) >>> +#define TCAN4X5X_WATCHDOG_EN BIT(3) >>> +#define TCAN4X5X_WD_60_MS_TIMER 0 >>> +#define TCAN4X5X_WD_600_MS_TIMER BIT(28) >>> +#define TCAN4X5X_WD_3_S_TIMER BIT(29) >>> +#define TCAN4X5X_WD_6_S_TIMER (BIT(28) | BIT(29)) >>> + >>> +/* Nominal Bit Timing & Prescaler Register */ >>> +#define TCAN4X5X_NSJW_SHIFT 25 >>> +#define TCAN4X5X_NBRP_SHIFT 16 >>> +#define TCAN4X5X_NTSEG1_SHIFT 8 >>> + >>> +#define TCAN4X5X_TDCR_TDCO_SHIFT 8 >>> + >>> +/* Data Bit Timing & Prescaler Register (DBTP) */ >>> +#define DBTP_TDC BIT(23) >>> +#define DBTP_DBRP_SHIFT 16 >>> +#define DBTP_DBRP_MASK (0x1f << DBTP_DBRP_SHIFT) >>> +#define DBTP_DTSEG1_SHIFT 8 >>> +#define DBTP_DTSEG1_MASK (0x1f << DBTP_DTSEG1_SHIFT) >>> +#define DBTP_DTSEG2_SHIFT 4 >>> +#define DBTP_DTSEG2_MASK (0xf << DBTP_DTSEG2_SHIFT) >>> +#define DBTP_DSJW_SHIFT 0 >>> +#define DBTP_DSJW_MASK (0xf << DBTP_DSJW_SHIFT) >>> + >>> +#define TCAN4x5x_QUEUE_LVL_MASK 0x1f >>> +#define TCAN4x5x_QUEUE_IDX_SHIFT 16 >>> +#define TCAN4x5x_QUEUE_IDX_MASK 0x1f00 >>> + >>> +#define TCAN4X5X_CANBUSNOM_INT_EN BIT(14) >>> + >>> +#define TCAN4X5X_NUM_TX_BUF 5 >>> +#define TCAN4X5X_TX_QUEUE_SHIFT 24 >>> +#define TCAN4X5X_TX_NDTB_SHIFT 16 >>> +#define TCAN4X5X_TX_BUF_START 0x324 >>> + >>> +#define TCAN4X5X_NUM_RX_BUF 3 >>> +#define TCAN4X5X_RX_WATER_MARK 2 >>> +#define TCAN4X5X_RX_WATER_MARK_SHIFT 24 >>> +#define TCAN4X5X_RX_FIFO_SZ_SHIFT 16 >>> +#define TCAN4X5X_RX_BUF_START 0x4 >>> + >>> +#define TCAN4X5X_RX_F1DS_SHIFT 4 >>> +#define TCAN4X5X_RX_RBDS_SHIFT 8 >>> + >>> +#define TCAN4X5X_RX_FIFO0_MESSAGE BIT(0) >>> +#define TCAN4X5X_RX_FIFO1_MESSAGE BIT(4) >>> +#define TCAN4X5X_RX_BUFFER_MESSAGE BIT(19) >>> +#define TCAN4X5X_RX_INDEX_MASK 0x3f00 >>> +#define TCAN4X5X_RX_INDEX_SHIFT 8 >>> + >>> +#define TCAN4X5X_RX_ADDR_OFFSET 0x8000 >>> +#define TCAN4X5X_RX_BUF_ADDR_OFFSET 0x8100 >>> +#define TCAN4X5X_RX_ADDR_MASK 0xffff >>> + >>> +#define TCAN4X5X_ERR_PROTOCOL_MASK 0x7 >>> +#define TCAN4X5X_ERR_STUFERR 0x1 >>> +#define TCAN4X5X_ERR_FRMERR 0x2 >>> +#define TCAN4X5X_ERR_ACKERR 0x3 >>> +#define TCAN4X5X_ERR_BIT1ERR 0x4 >>> +#define TCAN4X5X_ERR_BIT0ERR 0x5 >>> +#define TCAN4X5X_ERR_CRCERR 0x6 >>> + >>> +/* Interrupt bits */ >>> +#define TCAN4X5X_CANBUSTERMOPEN_INT_EN BIT(30) >>> +#define TCAN4X5X_CANHCANL_INT_EN BIT(29) >>> +#define TCAN4X5X_CANHBAT_INT_EN BIT(28) >>> +#define TCAN4X5X_CANLGND_INT_EN BIT(27) >>> +#define TCAN4X5X_CANBUSOPEN_INT_EN BIT(26) >>> +#define TCAN4X5X_CANBUSGND_INT_EN BIT(25) >>> +#define TCAN4X5X_CANBUSBAT_INT_EN BIT(24) >>> +#define TCAN4X5X_UVSUP_INT_EN BIT(22) >>> +#define TCAN4X5X_UVIO_INT_EN BIT(21) >>> +#define TCAN4X5X_TSD_INT_EN BIT(19) >>> +#define TCAN4X5X_ECCERR_INT_EN BIT(16) >>> +#define TCAN4X5X_CANINT_INT_EN BIT(15) >>> +#define TCAN4X5X_LWU_INT_EN BIT(14) >>> +#define TCAN4X5X_CANSLNT_INT_EN BIT(10) >>> +#define TCAN4X5X_CANDOM_INT_EN BIT(8) >>> +#define TCAN4X5X_CANBUS_ERR_INT_EN BIT(5) >>> +#define TCAN4X5X_BUS_FAULT BIT(4) >>> +#define TCAN4X5X_MCAN_INT BIT(1) >>> +#define TCAN4X5X_ENABLE_ALL_INT (TCAN4X5X_MCAN_INT | \ >>> + TCAN4X5X_BUS_FAULT | \ >>> + TCAN4X5X_CANBUS_ERR_INT_EN | \ >>> + TCAN4X5X_CANINT_INT_EN) >>> + >>> +/* MCAN Interrupt bits */ >>> +#define TCAN4X5X_MCAN_IR_ARA BIT(29) >>> +#define TCAN4X5X_MCAN_IR_PED BIT(28) >>> +#define TCAN4X5X_MCAN_IR_PEA BIT(27) >>> +#define TCAN4X5X_MCAN_IR_WD BIT(26) >>> +#define TCAN4X5X_MCAN_IR_BO BIT(25) >>> +#define TCAN4X5X_MCAN_IR_EW BIT(24) >>> +#define TCAN4X5X_MCAN_IR_EP BIT(23) >>> +#define TCAN4X5X_MCAN_IR_ELO BIT(22) >>> +#define TCAN4X5X_MCAN_IR_BEU BIT(21) >>> +#define TCAN4X5X_MCAN_IR_BEC BIT(20) >>> +#define TCAN4X5X_MCAN_IR_DRX BIT(19) >>> +#define TCAN4X5X_MCAN_IR_TOO BIT(18) >>> +#define TCAN4X5X_MCAN_IR_MRAF BIT(17) >>> +#define TCAN4X5X_MCAN_IR_TSW BIT(16) >>> +#define TCAN4X5X_MCAN_IR_TEFL BIT(15) >>> +#define TCAN4X5X_MCAN_IR_TEFF BIT(14) >>> +#define TCAN4X5X_MCAN_IR_TEFW BIT(13) >>> +#define TCAN4X5X_MCAN_IR_TEFN BIT(12) >>> +#define TCAN4X5X_MCAN_IR_TFE BIT(11) >>> +#define TCAN4X5X_MCAN_IR_TCF BIT(10) >>> +#define TCAN4X5X_MCAN_IR_TC BIT(9) >>> +#define TCAN4X5X_MCAN_IR_HPM BIT(8) >>> +#define TCAN4X5X_MCAN_IR_RF1L BIT(7) >>> +#define TCAN4X5X_MCAN_IR_RF1F BIT(6) >>> +#define TCAN4X5X_MCAN_IR_RF1W BIT(5) >>> +#define TCAN4X5X_MCAN_IR_RF1N BIT(4) >>> +#define TCAN4X5X_MCAN_IR_RF0L BIT(3) >>> +#define TCAN4X5X_MCAN_IR_RF0F BIT(2) >>> +#define TCAN4X5X_MCAN_IR_RF0W BIT(1) >>> +#define TCAN4X5X_MCAN_IR_RF0N BIT(0) >>> +#define TCAN4X5X_ENABLE_MCAN_INT (TCAN4X5X_MCAN_IR_TC | \ >>> + TCAN4X5X_MCAN_IR_RF0N | \ >>> + TCAN4X5X_MCAN_IR_RF1N | \ >>> + TCAN4X5X_MCAN_IR_RF0F | \ >>> + TCAN4X5X_MCAN_IR_RF1F) >>> + >>> +/* CCR bits */ >>> +#define TCAN4X5X_CCCR_NISO_BOSCH BIT(15) >>> +#define TCAN4X5X_CCCR_TXP BIT(15) >>> +#define TCAN4X5X_CCCR_EFBI BIT(13) >>> +#define TCAN4X5X_CCCR_PXHD_DIS BIT(12) >>> +#define TCAN4X5X_CCCR_BRSE BIT(9) >>> +#define TCAN4X5X_CCCR_FDOE BIT(8) >>> +#define TCAN4X5X_CCCR_TEST BIT(7) >>> +#define TCAN4X5X_CCCR_DAR_DIS BIT(6) >>> +#define TCAN4X5X_CCCR_MON BIT(5) >>> +#define TCAN4X5X_CCCR_CSR BIT(4) >>> +#define TCAN4X5X_CCCR_CSA BIT(3) >>> +#define TCAN4X5X_CCCR_ASM BIT(2) >>> +#define TCAN4X5X_CCCR_CCE BIT(1) >>> +#define TCAN4X5X_CCCR_INIT BIT(0) >>> + >>> +#define TCAN4X5X_EINT0 BIT(0) >>> +#define TCAN4X5X_EINT1 BIT(1) >>> + >>> +struct tcan4x5x_rx_regs { >>> + u32 fifo_status_reg; >>> + u32 fifo_config_reg; >>> + u32 fifo_ack_reg; >>> + u32 rx_buf_shift; >>> +}; >>> + >>> +struct tcan4x5x_rx_regs tcan4x5x_fifo_regs[] = { >>> + { TCAN4X5X_MCAN_RXF0S, TCAN4X5X_MCAN_RXF0C, TCAN4X5X_MCAN_RXF0A, 0}, >>> + { TCAN4X5X_MCAN_RXF1S, TCAN4X5X_MCAN_RXF1C, TCAN4X5X_MCAN_RXF1A, 4}, >>> + { TCAN4X5X_MCAN_NDAT1, TCAN4X5X_MCAN_RXBC, TCAN4X5X_MCAN_NDAT1, 8}, >>> +}; >>> + >>> +enum tcan4x5x_data_size { >>> + TCAN4X5X_8_BYTE = 0, >>> + TCAN4X5X_12_BYTE, >>> + TCAN4X5X_16_BYTE, >>> + TCAN4X5X_20_BYTE, >>> + TCAN4X5X_24_BYTE, >>> + TCAN4X5X_32_BYTE, >>> + TCAN4X5X_48_BYTE, >>> + TCAN4X5X_64_BYTE, >>> +}; >>> + >>> +static const struct can_bittiming_const tcan4x5x_bittiming_const = { >>> + .name = DEVICE_NAME, >>> + .tseg1_min = 2, >>> + .tseg1_max = 31, >>> + .tseg2_min = 2, >>> + .tseg2_max = 16, >>> + .sjw_max = 16, >>> + .brp_min = 1, >>> + .brp_max = 32, >>> + .brp_inc = 1, >>> +}; >>> + >>> +static const struct can_bittiming_const tcan4x5x_data_bittiming_const = { >>> + .name = DEVICE_NAME, >>> + .tseg1_min = 1, >>> + .tseg1_max = 32, >>> + .tseg2_min = 1, >>> + .tseg2_max = 16, >>> + .sjw_max = 16, >>> + .brp_min = 1, >>> + .brp_max = 32, >>> + .brp_inc = 1, >>> +}; >>> + >>> +static void tcan4x5x_clean(struct net_device *net) >>> +{ >>> + struct tcan4x5x_priv *priv = netdev_priv(net); >>> + >>> + if (priv->tx_skb || priv->tx_len) >>> + net->stats.tx_errors++; >>> + if (priv->tx_skb) >>> + dev_kfree_skb(priv->tx_skb); >>> + if (priv->tx_len) >>> + can_free_echo_skb(priv->net, 0); >>> + >>> + priv->tx_skb = NULL; >>> + priv->tx_len = 0; >>> +} >>> + >>> +static int regmap_spi_gather_write(void *context, const void *reg, >>> + size_t reg_len, const void *val, >>> + size_t val_len) >>> +{ >>> + struct device *dev = context; >>> + struct spi_device *spi = to_spi_device(dev); >>> + u32 addr; >>> + struct spi_message m; >>> + struct spi_transfer t[2] = {{ .tx_buf = &addr, .len = 4, .cs_change = 0,}, >>> + { .tx_buf = val, .len = val_len, },}; >>> + >>> + addr = TCAN4X5X_WRITE_CMD | (*((u16 *)reg) << 8) | val_len >> 2; >>> + >>> + spi_message_init(&m); >>> + spi_message_add_tail(&t[0], &m); >>> + spi_message_add_tail(&t[1], &m); >>> + >>> + return spi_sync(spi, &m); >>> +} >>> + >>> +static int tcan4x5x_regmap_write(void *context, const void *data, size_t count) >>> +{ >>> + u16 *reg = (u16 *)(data); >>> + const u32 *val = data + 2; >>> + >>> + return regmap_spi_gather_write(context, reg, 2, val, count - 2); >>> +} >>> + >>> +static int regmap_spi_async_write(void *context, >>> + const void *reg, size_t reg_len, >>> + const void *val, size_t val_len, >>> + struct regmap_async *a) >>> +{ >>> + return -ENOTSUPP; >>> +} >>> + >>> +static struct regmap_async *regmap_spi_async_alloc(void) >>> +{ >>> + return NULL; >>> +} >>> + >>> +static int tcan4x5x_regmap_read(void *context, >>> + const void *reg, size_t reg_size, >>> + void *val, size_t val_size) >>> +{ >>> + struct device *dev = context; >>> + struct spi_device *spi = to_spi_device(dev); >>> + >>> + u32 addr = TCAN4X5X_READ_CMD | (*((u16 *)reg) << 8) | val_size >> 2; >>> + >>> + return spi_write_then_read(spi, &addr, 4, val, val_size); >>> +} >>> + >>> +static struct regmap_bus tcan4x5x_bus = { >>> + .write = tcan4x5x_regmap_write, >>> + .gather_write = regmap_spi_gather_write, >>> + .async_write = regmap_spi_async_write, >>> + .async_alloc = regmap_spi_async_alloc, >>> + .read = tcan4x5x_regmap_read, >>> + .read_flag_mask = 0x00, >>> + .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, >>> + .val_format_endian_default = REGMAP_ENDIAN_NATIVE, >>> +}; >>> + >>> +static uint8_t tcan4x5x_dlc_conv(uint8_t input) >>> +{ >>> + const static u8 lookup[7] = {12, 16, 20, 24, 32, 48, 64}; >>> + >>> + if (input < 9) >>> + return input; >>> + >>> + if (input < 16) >>> + return lookup[(unsigned int)(input - 9)]; >>> + >>> + return 0; >>> +} >>> + >>> +static uint8_t tcan4x5x_txrxesc_value(uint8_t input) >>> +{ >>> + const u8 lookup[8] = {8, 12, 16, 20, 24, 32, 48, 64}; >>> + return lookup[(unsigned int)(input & 0x07)]; >>> +} >>> + >>> +static void tcan4x5x_hw_tx(struct tcan4x5x_priv *tcan4x5x) >>> +{ >>> + u32 sid, eid, exide, rtr, brs, esi, fdf, xtd, data_len; >>> + u32 mcan_address, mcan_tx_element_sz; >>> + int queue_stat, queue_lvl, queue_idx; >>> + struct canfd_frame *fd_frame; >>> + struct can_frame *frame; >>> + int tx_element_sz, i, temp; >>> + canid_t frame_id; >>> + u8 dlc_len; >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXFQS, &queue_stat); >>> + queue_lvl = queue_stat & TCAN4x5x_QUEUE_LVL_MASK; >>> + queue_idx = (queue_stat & TCAN4x5x_QUEUE_IDX_MASK) >> TCAN4x5x_QUEUE_IDX_SHIFT; >>> + >>> + if (tcan4x5x->tx_skb->len == CAN_MTU) { >>> + fd_frame = NULL; >>> + frame = (struct can_frame *)tcan4x5x->tx_skb->data; >>> + frame_id = frame->can_id; >>> + dlc_len = frame->can_dlc; >>> + data_len = ((dlc_len % 4) + dlc_len) / 4; >>> + brs = 0; >>> + } else if (tcan4x5x->tx_skb->len == CANFD_MTU) { >>> + frame = NULL; >>> + fd_frame = (struct canfd_frame *)tcan4x5x->tx_skb->data; >>> + frame_id = fd_frame->can_id; >>> + dlc_len = fd_frame->len; >>> + data_len = ((dlc_len % 4) + dlc_len) / 4; >>> + brs = fd_frame->flags & CANFD_BRS; >>> + esi = fd_frame->flags & CANFD_ESI; >>> + fdf = 1; >>> + } else { >>> + return; >>> + } >>> + >>> + eid = frame_id & CAN_EFF_MASK; >>> + rtr = (frame_id & CAN_RTR_FLAG) ? 1 : 0; >>> + >>> + exide = (frame_id & CAN_EFF_FLAG) ? 1 : 0; >>> + if (exide) { >>> + sid = frame_id & CAN_EFF_MASK; >>> + xtd = 1; >>> + } else { >>> + sid = (frame_id & CAN_SFF_MASK) << TCAN4X5X_SID_SHIFT; >>> + xtd = 0; >>> + } >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBC, &mcan_address); >>> + >>> + mcan_address = (mcan_address & 0xffff) + TCAN4X5X_MRAM_START; >>> + temp = (uint8_t)((mcan_address >> 24) & 0x3F); >>> + >>> + tx_element_sz = temp > 32 ? 32 : temp; >>> + temp = (uint8_t)((mcan_address >> 16) & 0x3F); >>> + >>> + tx_element_sz += temp > 32 ? 32 : temp; >>> + mcan_address += ((uint32_t)tx_element_sz * queue_idx); >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXESC, &mcan_tx_element_sz); >>> + tx_element_sz = tcan4x5x_txrxesc_value(mcan_tx_element_sz & 0x07) + 8; >>> + mcan_address += ((uint32_t)tx_element_sz * 0); >>> + >>> + tx_element_sz = (tcan4x5x_dlc_conv(dlc_len & 0x0F) + 8) >> 2; >>> + if (tcan4x5x_dlc_conv(dlc_len & 0x0F) % 4) >>> + tx_element_sz += 1; >>> + >>> + tcan4x5x->spi_tx_buf[0] = esi << TCAN4X5X_ESI_SHIFT | >>> + xtd << TCAN4X5X_XTD_SHIFT | >>> + rtr << TCAN4X5X_RTR_SHIFT | sid; >>> + >>> + tcan4x5x->spi_tx_buf[1] = fdf << TCAN4X5X_FDF_SHIFT | >>> + brs << TCAN4X5X_BRS_SHIFT | dlc_len << TCAN4X5X_DLC_SHIFT; >>> + >>> + if (tcan4x5x->tx_skb->len == CAN_MTU) >>> + memcpy(tcan4x5x->spi_tx_buf + TCAN4X5X_DATA_PKT_OFF, >>> + frame->data, dlc_len); >>> + else >>> + memcpy(tcan4x5x->spi_tx_buf + TCAN4X5X_DATA_PKT_OFF, >>> + fd_frame->data, dlc_len); >>> + >>> + for (i = dlc_len + 1; i < TCAN4X5X_BUF_LEN / 4; i++) >>> + tcan4x5x->spi_tx_buf[i] = 0; >>> + >>> + regmap_bulk_write(tcan4x5x->regmap, mcan_address, tcan4x5x->spi_tx_buf, >>> + TCAN4X5X_BUF_LEN); >>> + >>> + regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBAR, (1 << (queue_idx))); >>> +} >>> + >>> +int tcan4x5x_hw_rx(struct tcan4x5x_priv *tcan4x5x) >>> +{ >>> + u32 queue_idx, fifo_idx, fifo_start_addr, rx_buf_size, msg_type; >>> + u32 data_buffer[TCAN4X5X_BUF_LEN] = {0x0}; >>> + u32 rx_header[2] = {0x0}; >>> + struct tcan4x5x_rx_regs *buffer_regs; >>> + struct canfd_frame *fd_frame; >>> + int dlc_len, data_len; >>> + struct sk_buff *skb; >>> + >>> + skb = alloc_canfd_skb(tcan4x5x->net, &fd_frame); >>> + if (!skb) { >>> + dev_err(&tcan4x5x->spi->dev, "cannot allocate RX skb\n"); >>> + tcan4x5x->net->stats.rx_dropped++; >>> + return -ENOMEM; >>> + } >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, &msg_type); >>> + if (msg_type & TCAN4X5X_RX_FIFO0_MESSAGE) { >>> + buffer_regs = &tcan4x5x_fifo_regs[0]; >>> + } else if (msg_type & TCAN4X5X_RX_FIFO1_MESSAGE) { >>> + buffer_regs = &tcan4x5x_fifo_regs[1]; >>> + } else if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) { >>> + buffer_regs = &tcan4x5x_fifo_regs[2]; >>> + } else { >>> + buffer_regs = NULL; >>> + return -EINVAL; >>> + } >>> + >>> + rx_buf_size = TCAN4X5X_BUF_LEN; >>> + >>> + /* Determine which FIFO needs service */ >>> + regmap_read(tcan4x5x->regmap, buffer_regs->fifo_status_reg, &fifo_idx); >>> + if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) >>> + queue_idx = fifo_idx - 1; >>> + else >>> + queue_idx = (TCAN4X5X_RX_INDEX_MASK & fifo_idx) >> TCAN4X5X_RX_INDEX_SHIFT; >>> + >>> + /* Calculate the FIFO start address to service */ >>> + regmap_read(tcan4x5x->regmap, buffer_regs->fifo_config_reg, &fifo_start_addr); >>> + fifo_start_addr = (TCAN4X5X_RX_ADDR_MASK & fifo_start_addr); >>> + if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) >>> + fifo_start_addr = fifo_start_addr + TCAN4X5X_RX_BUF_ADDR_OFFSET + >>> + (rx_buf_size * queue_idx); >>> + else >>> + fifo_start_addr = fifo_start_addr + TCAN4X5X_RX_ADDR_OFFSET + >>> + (rx_buf_size * queue_idx); >>> + >>> + regmap_bulk_read(tcan4x5x->regmap, fifo_start_addr, rx_header, 2); >>> + >>> + dlc_len = (rx_header[1] & TCAN4X5X_DLC_MASK) >> TCAN4X5X_DLC_SHIFT; >>> + if (dlc_len <= 8) >>> + data_len = dlc_len; >>> + else >>> + data_len = tcan4x5x_txrxesc_value(dlc_len); >>> + >>> + regmap_bulk_read(tcan4x5x->regmap, fifo_start_addr + 8, >>> + data_buffer, data_len / 4); >>> + >>> + /* Acknowledge receipt of the data */ >>> + regmap_write(tcan4x5x->regmap, buffer_regs->fifo_ack_reg, queue_idx); >>> + >>> + if (rx_header[0] & TCAN4X5X_XTD_MASK) { >>> + fd_frame->can_id = CAN_EFF_FLAG; >>> + fd_frame->can_id |= (rx_header[0] & CAN_EFF_MASK); >>> + } else { >>> + fd_frame->can_id |= ((rx_header[0] >> TCAN4X5X_SID_SHIFT) & >>> + CAN_SFF_MASK); >>> + } >>> + >>> + if (rx_header[0] & TCAN4X5X_RTR_MASK) >>> + fd_frame->can_id |= CAN_RTR_FLAG; >>> + >>> + if (rx_header[0] & TCAN4X5X_ESI_MASK) { >>> + fd_frame->can_id |= CAN_ERR_FLAG; >>> + fd_frame->flags |= CANFD_ESI; >>> + netdev_dbg(tcan4x5x->net, "ESI Error\n"); >>> + } >>> + >>> + fd_frame->len = data_len; >>> + memcpy(fd_frame->data, data_buffer, fd_frame->len); >>> + >>> + tcan4x5x->net->stats.rx_packets++; >>> + tcan4x5x->net->stats.rx_bytes += fd_frame->len; >>> + >>> + can_led_event(tcan4x5x->net, CAN_LED_EVENT_RX); >>> + netif_rx_ni(skb); >>> + >>> + return 0; >>> +} >>> + >>> +static void tcan4x5x_sleep(struct spi_device *spi) >>> +{ >>> + struct tcan4x5x_priv *tcan4x5x = spi_get_drvdata(spi); >>> + >>> + regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, >>> + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_STANDBY); >>> +} >>> + >>> +static int tcan4x5x_reset(struct net_device *net) >>> +{ >>> + struct tcan4x5x_priv *tcan4x5x = netdev_priv(net); >>> + >>> + if (tcan4x5x->reset_gpio) { >>> + gpiod_set_value_cansleep(tcan4x5x->reset_gpio, 1); >>> + udelay(10); >>> + gpiod_set_value_cansleep(tcan4x5x->reset_gpio, 0); >>> + } else { >>> + regmap_write(tcan4x5x->regmap, TCAN4X5X_CONFIG, >>> + TCAN4X5X_SW_RESET); >>> + } >>> + >>> + return 0; >>> +} >>> + >>> +static int tcan4x5x_power_enable(struct regulator *reg, int enable) >>> +{ >>> + if (IS_ERR_OR_NULL(reg)) >>> + return 0; >>> + >>> + if (enable) >>> + return regulator_enable(reg); >>> + else >>> + return regulator_disable(reg); >>> +} >>> + >>> +static irqreturn_t tcan4x5x_can_ist(int irq, void *dev_id) >>> +{ >>> + struct tcan4x5x_priv *tcan4x5x = dev_id; >>> + struct spi_device *spi = tcan4x5x->spi; >>> + struct net_device *net = tcan4x5x->net; >>> + enum can_state new_state; >>> + int intf, eflag, mcan_intf; >>> + >>> + mutex_lock(&tcan4x5x->tcan4x5x_lock); >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_INT_FLAGS, &intf); >>> + if (intf & TCAN4X5X_MCAN_INT) >>> + tcan4x5x_hw_rx(tcan4x5x); >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, &mcan_intf); >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_STATUS, &eflag); >>> + /* Update can state */ >>> + if (eflag & TCAN4X5X_MCAN_IR_BO) >>> + new_state = CAN_STATE_BUS_OFF; >>> + else if (eflag & TCAN4X5X_MCAN_IR_EP) >>> + new_state = CAN_STATE_ERROR_PASSIVE; >>> + else if (eflag & TCAN4X5X_MCAN_IR_EW) >>> + new_state = CAN_STATE_ERROR_WARNING; >>> + else >>> + new_state = CAN_STATE_ERROR_ACTIVE; >>> + >>> + if (new_state != tcan4x5x->can.state) { >>> + struct can_frame *cf; >>> + struct sk_buff *skb; >>> + enum can_state rx_state, tx_state; >>> + u32 error_count; >>> + >>> + skb = alloc_can_err_skb(net, &cf); >>> + if (!skb) >>> + goto ist_out; >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_ECR, &error_count); >>> + cf->data[6] = error_count & 0xff; >>> + cf->data[7] = error_count & 0x7f00 >> 8; >>> + tx_state = cf->data[6] >= cf->data[7] ? new_state : 0; >>> + rx_state = cf->data[6] <= cf->data[7] ? new_state : 0; >>> + can_change_state(net, cf, tx_state, rx_state); >>> + netif_rx_ni(skb); >>> + >>> + if (new_state == CAN_STATE_BUS_OFF) { >>> + can_bus_off(net); >>> + if (tcan4x5x->can.restart_ms == 0) { >>> + tcan4x5x->force_quit = 1; >>> + tcan4x5x_sleep(spi); >>> + goto ist_out; >>> + } >>> + } >>> + } >>> + >>> + /* Update bus errors */ >>> + if ((intf & TCAN4X5X_BUS_FAULT) && >>> + (tcan4x5x->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) { >>> + struct can_frame *cf; >>> + struct sk_buff *skb; >>> + u32 psr_err, error_count; >>> + >>> + /* Check for protocol errors */ >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_PSR, &psr_err); >>> + if (psr_err & TCAN4X5X_ERR_PROTOCOL_MASK) { >>> + skb = alloc_can_err_skb(net, &cf); >>> + if (!skb) >>> + goto ist_out; >>> + >>> + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; >>> + tcan4x5x->can.can_stats.bus_error++; >>> + tcan4x5x->net->stats.rx_errors++; >>> + if (psr_err & TCAN4X5X_ERR_BIT0ERR) >>> + cf->data[2] |= CAN_ERR_PROT_BIT0; >>> + else if (psr_err & TCAN4X5X_ERR_BIT1ERR) >>> + cf->data[2] |= CAN_ERR_PROT_BIT1; >>> + else if (psr_err & TCAN4X5X_ERR_FRMERR) >>> + cf->data[2] |= CAN_ERR_PROT_FORM; >>> + else if (psr_err & TCAN4X5X_ERR_STUFERR) >>> + cf->data[2] |= CAN_ERR_PROT_STUFF; >>> + else if (psr_err & TCAN4X5X_ERR_CRCERR) >>> + cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; >>> + else if (psr_err & TCAN4X5X_ERR_ACKERR) >>> + cf->data[3] |= CAN_ERR_PROT_LOC_ACK; >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_ECR, >>> + &error_count); >>> + cf->data[6] = error_count & 0xff; >>> + cf->data[7] = error_count & 0x7f00 >> 8; >>> + netdev_dbg(tcan4x5x->net, "Bus Error\n"); >>> + netif_rx_ni(skb); >>> + } >>> + } >>> + >>> + if (mcan_intf & TCAN4X5X_MCAN_IR_TC) { >>> + net->stats.tx_packets++; >>> + net->stats.tx_bytes += tcan4x5x->tx_len - 1; >>> + can_led_event(net, CAN_LED_EVENT_TX); >>> + if (tcan4x5x->tx_len) { >>> + can_get_echo_skb(net, 0); >>> + tcan4x5x->tx_len = 0; >>> + } >>> + netif_wake_queue(net); >>> + } >>> + >>> +ist_out: >>> + regmap_write(tcan4x5x->regmap, TCAN4X5X_INT_FLAGS, TCAN4X5X_CLEAR_ALL_INT); >>> + regmap_write(tcan4x5x->regmap, TCAN4X5X_STATUS, TCAN4X5X_CLEAR_ALL_INT); >>> + regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, >>> + TCAN4X5X_CLEAR_ALL_INT); >>> + >>> + mutex_unlock(&tcan4x5x->tcan4x5x_lock); >>> + return IRQ_HANDLED; >>> +} >>> + >>> +static int tcan4x5x_do_set_bittiming(struct net_device *net) >>> +{ >>> + struct tcan4x5x_priv *priv = netdev_priv(net); >>> + struct can_bittiming *bt = &priv->can.bittiming; >>> + struct can_bittiming *dbt = &priv->can.data_bittiming; >>> + u16 brp, sjw, tseg1, tseg2; >>> + int ret; >>> + u32 val; >>> + >>> + brp = bt->brp - 1; >>> + sjw = bt->sjw - 1; >>> + tseg1 = bt->prop_seg + bt->phase_seg1 - 1; >>> + tseg2 = bt->phase_seg2 - 1; >>> + val = (brp << TCAN4X5X_NBRP_SHIFT) | (sjw << TCAN4X5X_NSJW_SHIFT) | >>> + (tseg1 << TCAN4X5X_NTSEG1_SHIFT) | tseg2; >>> + >>> + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_NBTP, val); >>> + if (ret) >>> + return -EIO; >>> + >>> + if (priv->can.ctrlmode & CAN_CTRLMODE_FD) { >>> + val = 0; >>> + brp = dbt->brp - 1; >>> + sjw = dbt->sjw - 1; >>> + tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1; >>> + tseg2 = dbt->phase_seg2 - 1; >>> + >>> + /* TDC is only needed for bitrates beyond 2.5 MBit/s. >>> + * This is mentioned in the "Bit Time Requirements for CAN FD" >>> + * paper presented at the International CAN Conference 2013 >>> + */ >>> + if (dbt->bitrate > 2500000) { >>> + u32 tdco, ssp; >>> + >>> + /* Use the same value of secondary sampling point >>> + * as the data sampling point >>> + */ >>> + ssp = dbt->sample_point; >>> + >>> + /* Equation based on Bosch's M_CAN User Manual's >>> + * Transmitter Delay Compensation Section >>> + */ >>> + tdco = (priv->can.clock.freq / 1000) * >>> + ssp / dbt->bitrate; >>> + >>> + /* Max valid TDCO value is 127 */ >>> + if (tdco > 127) { >>> + netdev_warn(net, "TDCO value of %u is beyond maximum. Using maximum possible value\n", >>> + tdco); >>> + tdco = 127; >>> + } >>> + >>> + val |= DBTP_TDC; >>> + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_TDCR, >>> + tdco << TCAN4X5X_TDCR_TDCO_SHIFT); >>> + if (ret) >>> + return -EIO; >>> + } >>> + >>> + val |= (brp << DBTP_DBRP_SHIFT) | >>> + (sjw << DBTP_DSJW_SHIFT) | >>> + (tseg1 << DBTP_DTSEG1_SHIFT) | >>> + (tseg2 << DBTP_DTSEG2_SHIFT); >>> + >>> + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_DBTP, val); >>> + } >>> + >>> + return ret; >>> +} >>> + >>> +static int tcan4x5x_setup(struct spi_device *spi) >>> +{ >>> + struct tcan4x5x_priv *tcan4x5x = spi_get_drvdata(spi); >>> + int start_reg = TCAN4X5X_MRAM_START; >>> + int end_reg = start_reg + TCAN4X5X_MRAM_SIZE; >>> + int ret; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_REG, >>> + TCAN4X5X_CLEAR_ALL_INT); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_EN, >>> + TCAN4X5X_ENABLE_MCAN_INT); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_CCCR, >>> + TCAN4X5X_CCCR_INIT | TCAN4X5X_CCCR_CCE); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_CCCR, >>> + TCAN4X5X_CCCR_INIT | TCAN4X5X_CCCR_CCE | >>> + TCAN4X5X_CCCR_FDOE | TCAN4X5X_CCCR_BRSE); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = tcan4x5x_do_set_bittiming(tcan4x5x->net); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXESC, >>> + TCAN4X5X_64_BYTE); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBC, >>> + (TCAN4X5X_NUM_TX_BUF << TCAN4X5X_TX_QUEUE_SHIFT | >>> + TCAN4X5X_TX_BUF_START)); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_RXF0C, >>> + (TCAN4X5X_RX_WATER_MARK << TCAN4X5X_RX_WATER_MARK_SHIFT | >>> + TCAN4X5X_NUM_RX_BUF << TCAN4X5X_RX_FIFO_SZ_SHIFT | >>> + TCAN4X5X_RX_BUF_START)); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_RXESC, >>> + (TCAN4X5X_64_BYTE << TCAN4X5X_RX_RBDS_SHIFT | >>> + TCAN4X5X_64_BYTE << TCAN4X5X_RX_F1DS_SHIFT | >>> + TCAN4X5X_64_BYTE)); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBTIE, >>> + TCAN4X5X_SET_ALL_INT); >>> + if (ret) >>> + return -EIO; >>> + >>> + >>> + ret = regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, >>> + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_NORMAL); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_ILE, TCAN4X5X_EINT0); >>> + if (ret) >>> + return -EIO; >>> + >>> + /* Zero out the MCAN buffers */ >>> + while (start_reg < end_reg) { >>> + regmap_write(tcan4x5x->regmap, start_reg, 0); >>> + start_reg += 4; >>> + } >>> + >>> + return ret; >>> +} >>> + >>> +static void tcan4x5x_tx_work_handler(struct work_struct *ws) >>> +{ >>> + struct tcan4x5x_priv *tcan4x5x = container_of(ws, struct tcan4x5x_priv, >>> + tx_work); >>> + struct net_device *net = tcan4x5x->net; >>> + struct can_frame *frame; >>> + >>> + mutex_lock(&tcan4x5x->tcan4x5x_lock); >>> + if (tcan4x5x->tx_skb) { >>> + if (tcan4x5x->can.state == CAN_STATE_BUS_OFF) { >>> + tcan4x5x_clean(net); >>> + } else { >>> + frame = (struct can_frame *)tcan4x5x->tx_skb->data; >>> + tcan4x5x_hw_tx(tcan4x5x); >>> + tcan4x5x->tx_len = 1 + frame->can_dlc; >>> + can_put_echo_skb(tcan4x5x->tx_skb, net, 0); >>> + tcan4x5x->tx_skb = NULL; >>> + } >>> + } >>> + mutex_unlock(&tcan4x5x->tcan4x5x_lock); >>> +} >>> + >>> +static void tcan4x5x_restart_work_handler(struct work_struct *ws) >>> +{ >>> + struct tcan4x5x_priv *tcan4x5x = container_of(ws, struct tcan4x5x_priv, >>> + restart_work); >>> + struct spi_device *spi = tcan4x5x->spi; >>> + struct net_device *net = tcan4x5x->net; >>> + >>> + mutex_lock(&tcan4x5x->tcan4x5x_lock); >>> + if (tcan4x5x->after_suspend) { >>> + tcan4x5x_reset(net); >>> + tcan4x5x_setup(spi); >>> + if (tcan4x5x->after_suspend & AFTER_SUSPEND_RESTART) { >>> + tcan4x5x_setup(spi); >>> + } else if (tcan4x5x->after_suspend & AFTER_SUSPEND_UP) { >>> + netif_device_attach(net); >>> + tcan4x5x_clean(net); >>> + tcan4x5x_setup(spi); >>> + netif_wake_queue(net); >>> + } else { >>> + tcan4x5x_sleep(spi); >>> + } >>> + tcan4x5x->after_suspend = 0; >>> + tcan4x5x->force_quit = 0; >>> + } >>> + >>> + if (tcan4x5x->restart_tx) { >>> + tcan4x5x->restart_tx = 0; >>> + tcan4x5x_reset(net); >>> + tcan4x5x_clean(net); >>> + tcan4x5x_setup(spi); >>> + netif_wake_queue(net); >>> + } >>> + mutex_unlock(&tcan4x5x->tcan4x5x_lock); >>> +} >>> + >>> +static int tcan4x5x_open(struct net_device *net) >>> +{ >>> + struct tcan4x5x_priv *priv = netdev_priv(net); >>> + struct spi_device *spi = priv->spi; >>> + unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_LOW; >>> + int ret; >>> + >>> + ret = open_candev(net); >>> + if (ret) >>> + return ret; >>> + >>> + mutex_lock(&priv->tcan4x5x_lock); >>> + tcan4x5x_power_enable(priv->power, 1); >>> + >>> + priv->force_quit = 0; >>> + priv->tx_skb = NULL; >>> + priv->tx_len = 0; >>> + >>> + ret = request_threaded_irq(priv->irq, NULL, tcan4x5x_can_ist, >>> + flags, DEVICE_NAME, priv); >>> + if (ret) { >>> + dev_err(&spi->dev, "failed to acquire irq %d %i\n", >>> + priv->irq, ret); >>> + goto out_close; >>> + } >>> + >>> + priv->wq = alloc_workqueue("tcan4x5x_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM, >>> + 0); >>> + if (!priv->wq) { >>> + ret = -ENOMEM; >>> + goto out_free_irq; >>> + } >>> + >>> + INIT_WORK(&priv->tx_work, tcan4x5x_tx_work_handler); >>> + INIT_WORK(&priv->restart_work, tcan4x5x_restart_work_handler); >>> + >>> + priv->spi_tx_buf = devm_kzalloc(&spi->dev, TCAN4X5X_BUF_LEN, >>> + GFP_KERNEL); >>> + if (!priv->spi_tx_buf) { >>> + ret = -ENOMEM; >>> + goto out_free_wq; >>> + } >>> + >>> + priv->spi_rx_buf = devm_kzalloc(&spi->dev, TCAN4X5X_BUF_LEN, >>> + GFP_KERNEL); >>> + if (!priv->spi_rx_buf) { >>> + ret = -ENOMEM; >>> + goto out_free_wq; >>> + } >>> + >>> + if (priv->wake_gpio) >>> + gpiod_set_value_cansleep(priv->wake_gpio, 1); >>> + >>> + ret = tcan4x5x_reset(net); >>> + if (ret) >>> + goto out_free_wq; >>> + >>> + ret = tcan4x5x_setup(spi); >>> + if (ret) >>> + goto out_free_wq; >>> + >>> + can_led_event(net, CAN_LED_EVENT_OPEN); >>> + netif_wake_queue(net); >>> + mutex_unlock(&priv->tcan4x5x_lock); >>> + >>> + return 0; >>> + >>> + out_free_wq: >>> + destroy_workqueue(priv->wq); >>> + out_free_irq: >>> + free_irq(priv->irq, priv); >>> + tcan4x5x_sleep(spi); >>> + out_close: >>> + tcan4x5x_power_enable(priv->power, 0); >>> + close_candev(net); >>> + mutex_unlock(&priv->tcan4x5x_lock); >>> + return ret; >>> +} >>> + >>> +static int tcan4x5x_stop(struct net_device *net) >>> +{ >>> + struct tcan4x5x_priv *priv = netdev_priv(net); >>> + struct spi_device *spi = priv->spi; >>> + >>> + close_candev(net); >>> + >>> + priv->force_quit = 1; >>> + free_irq(priv->irq, priv); >>> + destroy_workqueue(priv->wq); >>> + priv->wq = NULL; >>> + >>> + mutex_lock(&priv->tcan4x5x_lock); >>> + >>> + priv->can.state = CAN_STATE_STOPPED; >>> + tcan4x5x_sleep(spi); >>> + tcan4x5x_power_enable(priv->power, 0); >>> + >>> + mutex_unlock(&priv->tcan4x5x_lock); >>> + >>> + can_led_event(net, CAN_LED_EVENT_STOP); >>> + >>> + return 0; >>> +} >>> + >>> +static netdev_tx_t tcan4x5x_hard_start_xmit(struct sk_buff *skb, >>> + struct net_device *net) >>> +{ >>> + struct tcan4x5x_priv *priv = netdev_priv(net); >>> + struct spi_device *spi = priv->spi; >>> + >>> + if (priv->tx_skb || priv->tx_len) { >>> + dev_warn(&spi->dev, "hard_xmit called while tx busy\n"); >>> + return NETDEV_TX_BUSY; >>> + } >>> + >>> + if (can_dropped_invalid_skb(net, skb)) >>> + return NETDEV_TX_OK; >>> + >>> + netif_stop_queue(net); >>> + priv->tx_skb = skb; >>> + queue_work(priv->wq, &priv->tx_work); >>> + >>> + return NETDEV_TX_OK; >>> +} >>> + >>> +static int tcan4x5x_do_set_mode(struct net_device *net, enum can_mode mode) >>> +{ >>> + struct tcan4x5x_priv *priv = netdev_priv(net); >>> + >>> + switch (mode) { >>> + case CAN_MODE_START: >>> + tcan4x5x_clean(net); >>> + priv->can.state = CAN_STATE_ERROR_ACTIVE; >>> + priv->restart_tx = 1; >>> + queue_work(priv->wq, &priv->restart_work); >>> + break; >>> + default: >>> + return -EOPNOTSUPP; >>> + } >>> + >>> + return 0; >>> +} >>> + >>> +static const struct net_device_ops tcan4x5x_netdev_ops = { >>> + .ndo_open = tcan4x5x_open, >>> + .ndo_stop = tcan4x5x_stop, >>> + .ndo_start_xmit = tcan4x5x_hard_start_xmit, >>> + .ndo_change_mtu = can_change_mtu, >>> +}; >>> + >>> +static int tcan4x5x_parse_config(struct tcan4x5x_priv *tcan4x5x) >>> +{ >>> + tcan4x5x->reset_gpio = devm_gpiod_get_optional(&tcan4x5x->spi->dev, >>> + "reset", GPIOD_OUT_LOW); >>> + if (IS_ERR(tcan4x5x->reset_gpio)) >>> + tcan4x5x->reset_gpio = NULL; >>> + >>> + tcan4x5x->wake_gpio = devm_gpiod_get_optional(&tcan4x5x->spi->dev, >>> + "wake-up", GPIOD_OUT_LOW); >>> + if (IS_ERR(tcan4x5x->wake_gpio)) >>> + tcan4x5x->wake_gpio = NULL; >>> + >>> + tcan4x5x->interrupt_gpio = devm_gpiod_get(&tcan4x5x->spi->dev, >>> + "data-ready", GPIOD_IN); >>> + if (IS_ERR(tcan4x5x->interrupt_gpio)) { >>> + dev_err(&tcan4x5x->spi->dev, "data-ready gpio not defined\n"); >>> + return -EINVAL; >>> + } >>> + >>> + tcan4x5x->irq = gpiod_to_irq(tcan4x5x->interrupt_gpio); >>> + >>> + tcan4x5x->power = devm_regulator_get_optional(&tcan4x5x->spi->dev, >>> + "vsup"); >>> + if (PTR_ERR(tcan4x5x->power) == -EPROBE_DEFER) >>> + return -EPROBE_DEFER; >>> + >>> + return 0; >>> +} >>> + >>> +static const struct regmap_config tcan4x5x_regmap = { >>> + .reg_bits = 16, >>> + .val_bits = 32, >>> + .cache_type = REGCACHE_NONE, >>> + .max_register = TCAN4X5X_MAX_REGISTER, >>> +}; >>> + >>> +static int tcan4x5x_can_probe(struct spi_device *spi) >>> +{ >>> + struct net_device *net; >>> + struct tcan4x5x_priv *priv; >>> + struct clk *clk; >>> + int freq, ret; >>> + >>> + clk = devm_clk_get(&spi->dev, NULL); >>> + if (IS_ERR(clk)) { >>> + dev_err(&spi->dev, "no CAN clock source defined\n"); >>> + freq = TCAN4X5X_EXT_CLK_DEF; >>> + } else { >>> + freq = clk_get_rate(clk); >>> + } >>> + >>> + /* Sanity check */ >>> + if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF) >>> + return -ERANGE; >>> + >>> + /* Allocate can/net device */ >>> + net = alloc_candev(sizeof(*priv), TCAN4X5X_TX_ECHO_SKB_MAX); >>> + if (!net) >>> + return -ENOMEM; >>> + >>> + if (!IS_ERR(clk)) { >>> + ret = clk_prepare_enable(clk); >>> + if (ret) >>> + goto out_free; >>> + } >>> + >>> + net->netdev_ops = &tcan4x5x_netdev_ops; >>> + net->flags |= IFF_ECHO; >>> + net->mtu = CANFD_MTU; >>> + >>> + priv = netdev_priv(net); >>> + priv->can.bittiming_const = &tcan4x5x_bittiming_const; >>> + priv->can.data_bittiming_const = &tcan4x5x_data_bittiming_const; >>> + priv->can.do_set_mode = tcan4x5x_do_set_mode; >>> + priv->can.clock.freq = freq; >>> + priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | >>> + CAN_CTRLMODE_LISTENONLY | >>> + CAN_CTRLMODE_BERR_REPORTING | >>> + CAN_CTRLMODE_FD | >>> + CAN_CTRLMODE_FD_NON_ISO; >>> + priv->net = net; >>> + priv->spi = spi; >>> + priv->clk = clk; >>> + spi_set_drvdata(spi, priv); >>> + >>> + ret = tcan4x5x_parse_config(priv); >>> + if (ret) >>> + goto out_clk; >>> + >>> + /* Configure the SPI bus */ >>> + spi->bits_per_word = 32; >>> + ret = spi_setup(spi); >>> + if (ret) >>> + goto out_clk; >>> + >>> + mutex_init(&priv->tcan4x5x_lock); >>> + >>> + priv->regmap = devm_regmap_init(&spi->dev, &tcan4x5x_bus, >>> + &spi->dev, &tcan4x5x_regmap); >>> + >>> + SET_NETDEV_DEV(net, &spi->dev); >>> + ret = register_candev(net); >>> + if (ret) >>> + goto error_probe; >>> + >>> + devm_can_led_init(net); >>> + >>> + netdev_info(net, "TCAN4X5X successfully initialized.\n"); >>> + return 0; >>> + >>> +error_probe: >>> + tcan4x5x_power_enable(priv->power, 0); >>> +out_clk: >>> + if (!IS_ERR(clk)) >>> + clk_disable_unprepare(clk); >>> +out_free: >>> + free_candev(net); >>> + dev_err(&spi->dev, "Probe failed, err=%d\n", -ret); >>> + return ret; >>> +} >>> + >>> +static int tcan4x5x_can_remove(struct spi_device *spi) >>> +{ >>> + struct tcan4x5x_priv *priv = spi_get_drvdata(spi); >>> + struct net_device *net = priv->net; >>> + >>> + unregister_candev(net); >>> + >>> + tcan4x5x_power_enable(priv->power, 0); >>> + >>> + if (!IS_ERR(priv->clk)) >>> + clk_disable_unprepare(priv->clk); >>> + >>> + free_candev(net); >>> + >>> + return 0; >>> +} >>> + >>> +static const struct of_device_id tcan4x5x_of_match[] = { >>> + { .compatible = "ti,tcan4x5x", }, >>> + { } >>> +}; >>> +MODULE_DEVICE_TABLE(of, tcan4x5x_of_match); >>> + >>> +static const struct spi_device_id tcan4x5x_id_table[] = { >>> + { >>> + .name = "tcan4x5x", >>> + .driver_data = 0, >>> + }, >>> + { } >>> +}; >>> +MODULE_DEVICE_TABLE(spi, tcan4x5x_id_table); >>> + >>> +static struct spi_driver tcan4x5x_can_driver = { >>> + .driver = { >>> + .name = DEVICE_NAME, >>> + .of_match_table = tcan4x5x_of_match, >>> + .pm = NULL, >>> + }, >>> + .id_table = tcan4x5x_id_table, >>> + .probe = tcan4x5x_can_probe, >>> + .remove = tcan4x5x_can_remove, >>> +}; >>> +module_spi_driver(tcan4x5x_can_driver); >>> + >>> +MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); >>> +MODULE_DESCRIPTION("Texas Instruments TCAN4x5x CAN driver"); >>> +MODULE_LICENSE("GPL v2"); >>> diff --git a/drivers/net/can/spi/tcan4x5x.h b/drivers/net/can/spi/tcan4x5x.h >>> new file mode 100644 >>> index 000000000000..5e14ba571d49 >>> --- /dev/null >>> +++ b/drivers/net/can/spi/tcan4x5x.h >>> @@ -0,0 +1,109 @@ >>> +// SPDX-License-Identifier: GPL-2.0 >>> +// SPI to CAN driver for the Texas Instruments TCA4x5x >>> +// Flash driver chip family >>> +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ >>> + >>> +#define TCAN4X5X_DEV_ID0 0x00 >>> +#define TCAN4X5X_DEV_ID1 0x04 >>> +#define TCAN4X5X_REV 0x08 >>> +#define TCAN4X5X_STATUS 0x0C >>> +#define TCAN4X5X_ERROR_STATUS 0x10 >>> +#define TCAN4X5X_CONTROL 0x14 >>> + >>> +#define TCAN4X5X_CONFIG 0x800 >>> +#define TCAN4X5X_TS_PRESCALE 0x804 >>> +#define TCAN4X5X_TEST_REG 0x808 >>> +#define TCAN4X5X_INT_FLAGS 0x820 >>> +#define TCAN4X5X_MCAN_INT_REG 0x824 >>> +#define TCAN4X5X_INT_EN 0x830 >>> + >>> +#define TCAN4X5X_MCAN_CREL 0x1000 >>> +#define TCAN4X5X_MCAN_ENDN 0x1004 >>> +#define TCAN4X5X_MCAN_CUST 0x1008 >>> +#define TCAN4X5X_MCAN_DBTP 0x100C >>> +#define TCAN4X5X_MCAN_TEST 0x1010 >>> +#define TCAN4X5X_MCAN_RWD 0x1014 >>> +#define TCAN4X5X_MCAN_CCCR 0x1018 >>> +#define TCAN4X5X_MCAN_NBTP 0x101C >>> +#define TCAN4X5X_MCAN_TSCC 0x1020 >>> +#define TCAN4X5X_MCAN_TSCV 0x1024 >>> +#define TCAN4X5X_MCAN_TOCC 0x1028 >>> +#define TCAN4X5X_MCAN_TOCV 0x102C >>> +#define TCAN4X5X_MCAN_ECR 0x1040 >>> +#define TCAN4X5X_MCAN_PSR 0x1044 >>> +#define TCAN4X5X_MCAN_TDCR 0x1048 >>> +#define TCAN4X5X_MCAN_INT_FLAG 0x1050 >>> +#define TCAN4X5X_MCAN_INT_EN 0x1054 >>> +#define TCAN4X5X_MCAN_ILS 0x1058 >>> +#define TCAN4X5X_MCAN_ILE 0x105C >>> +#define TCAN4X5X_MCAN_GFC 0x1080 >>> +#define TCAN4X5X_MCAN_SIDFC 0x1084 >>> +#define TCAN4X5X_MCAN_XIDFC 0x1088 >>> +#define TCAN4X5X_MCAN_XIDAM 0x1090 >>> +#define TCAN4X5X_MCAN_HPMS 0x1094 >>> +#define TCAN4X5X_MCAN_NDAT1 0x1098 >>> +#define TCAN4X5X_MCAN_NDAT2 0x109C >>> +#define TCAN4X5X_MCAN_RXF0C 0x10A0 >>> +#define TCAN4X5X_MCAN_RXF0S 0x10A4 >>> +#define TCAN4X5X_MCAN_RXF0A 0x10A8 >>> +#define TCAN4X5X_MCAN_RXBC 0x10AC >>> +#define TCAN4X5X_MCAN_RXF1C 0x10B0 >>> +#define TCAN4X5X_MCAN_RXF1S 0x10B4 >>> +#define TCAN4X5X_MCAN_RXF1A 0x10B8 >>> +#define TCAN4X5X_MCAN_RXESC 0x10BC >>> +#define TCAN4X5X_MCAN_TXBC 0x10C0 >>> +#define TCAN4X5X_MCAN_TXFQS 0x10C4 >>> +#define TCAN4X5X_MCAN_TXESC 0x10C8 >>> +#define TCAN4X5X_MCAN_TXBRP 0x10CC >>> +#define TCAN4X5X_MCAN_TXBAR 0x10D0 >>> +#define TCAN4X5X_MCAN_TXBCR 0x10D4 >>> +#define TCAN4X5X_MCAN_TXBTO 0x10D8 >>> +#define TCAN4X5X_MCAN_TXBCF 0x10DC >>> +#define TCAN4X5X_MCAN_TXBTIE 0x10E0 >>> +#define TCAN4X5X_MCAN_TXBCIE 0x10E4 >>> +#define TCAN4X5X_MCAN_TXEFC 0x10F0 >>> +#define TCAN4X5X_MCAN_TXEFS 0x10F4 >>> +#define TCAN4X5X_MCAN_TXEFA 0x10F8 >>> + >>> +#define TCAN4X5X_MRAM_START 0x8000 >>> +#define TCAN4X5X_MRAM_SIZE 2048 >>> + >>> +#define TCAN4X5X_MAX_REGISTER 0x8fff >>> + >>> +/* 64 byte buffer + 8 byte MCAN header */ >>> +#define TCAN4X5X_BUF_LEN 72 >>> + >>> +struct tcan4x5x_priv { >>> + struct can_priv can; >>> + struct net_device *net; >>> + struct regmap *regmap; >>> + struct spi_device *spi; >>> + >>> + struct mutex tcan4x5x_lock; /* SPI device lock */ >>> + >>> + struct gpio_desc *reset_gpio; >>> + struct gpio_desc *interrupt_gpio; >>> + struct gpio_desc *wake_gpio; >>> + struct regulator *power; >>> + struct clk *clk; >>> + >>> + struct sk_buff *tx_skb; >>> + int tx_len; >>> + >>> + struct workqueue_struct *wq; >>> + struct work_struct tx_work; >>> + struct work_struct restart_work; >>> + >>> + u32 *spi_tx_buf; >>> + u32 *spi_rx_buf; >>> + >>> + int force_quit; >>> + int after_suspend; >>> +#define AFTER_SUSPEND_UP 1 >>> +#define AFTER_SUSPEND_DOWN 2 >>> +#define AFTER_SUSPEND_POWER 4 >>> +#define AFTER_SUSPEND_RESTART 8 >>> + int restart_tx; >>> + >>> + int irq; >>> +}; >>> >> >> -- ------------------ Dan Murphy ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel 2018-09-26 18:00 ` Dan Murphy @ 2018-09-26 18:34 ` Wolfgang Grandegger 0 siblings, 0 replies; 10+ messages in thread From: Wolfgang Grandegger @ 2018-09-26 18:34 UTC (permalink / raw) To: Dan Murphy, mkl, davem; +Cc: linux-can, netdev, linux-kernel Hello Dan, Am 26.09.2018 um 20:00 schrieb Dan Murphy: > Wolfgang > > On 09/26/2018 12:54 PM, Wolfgang Grandegger wrote: >> Hello, >> >> I wonder why you do not extend the existing MCAN driver by implementing >> an interface to access the hardware. Would that be feasible? >> > > That did cross my mind. The issue is I have no way of testing the existing > driver to make sure I did not break anything. Yes, I can imagine, but we should try to avoid duplicated code in the first place. I personally do not have a MCAN device at hand either, but we should be able to manage that. > My thought was to create a basic MCAN framework and attach the devices to it. > So, like in this case, if there is a special way to talk to the device it can > be handled in the device driver. Basically, that's what I have in mind. The "mcan" driver uses it's own directory with just one file in it. Maybe the idea behind that was to extend it sooner than later like the "c_can" driver. > If thats what is needed then I will have to re-write the driver. Let's have a closer look first. If it's just about accessing one register at a time, like with memory mapped io, the interface should be trivial but with SPI we may want to read/write a bulk of data to speed up the register accesses, use a work queue or thread, etc. Wolfgang ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel 2018-09-26 17:54 ` Wolfgang Grandegger 2018-09-26 18:00 ` Dan Murphy @ 2018-10-04 20:26 ` Dan Murphy 2018-10-05 5:56 ` Wolfgang Grandegger 1 sibling, 1 reply; 10+ messages in thread From: Dan Murphy @ 2018-10-04 20:26 UTC (permalink / raw) To: Wolfgang Grandegger, mkl, davem; +Cc: linux-can, netdev, linux-kernel Wolfgang On 09/26/2018 12:54 PM, Wolfgang Grandegger wrote: > Hello, > > I wonder why you do not extend the existing MCAN driver by implementing > an interface to access the hardware. Would that be feasible? > I have created a m_can_core code base that can be used by other hardware that have special needs. So I have created the m_can_core, m_can and the tcan4x5x drivers. I can RFC the code to see if this is what is expected. It is not 100% working but it is close enough for a directional call. Dan > Wolfgang. > > Am 26.09.2018 um 19:40 schrieb Dan Murphy: >> bump >> >> On 09/10/2018 03:12 PM, Dan Murphy wrote: >>> Add the TCAN4x5x SPI CAN driver. This device >>> uses the Bosch MCAN IP core along with a SPI >>> interface map. The register and data are >>> 32 bits wide. >>> >>> Signed-off-by: Dan Murphy <dmurphy@ti.com> >>> --- >>> drivers/net/can/spi/Kconfig | 5 + >>> drivers/net/can/spi/Makefile | 1 + >>> drivers/net/can/spi/tcan4x5x.c | 1206 ++++++++++++++++++++++++++++++++ >>> drivers/net/can/spi/tcan4x5x.h | 109 +++ >>> 4 files changed, 1321 insertions(+) >>> create mode 100644 drivers/net/can/spi/tcan4x5x.c >>> create mode 100644 drivers/net/can/spi/tcan4x5x.h >>> >>> diff --git a/drivers/net/can/spi/Kconfig b/drivers/net/can/spi/Kconfig >>> index 8f2e0dd7b756..8cac6ce37506 100644 >>> --- a/drivers/net/can/spi/Kconfig >>> +++ b/drivers/net/can/spi/Kconfig >>> @@ -13,4 +13,9 @@ config CAN_MCP251X >>> ---help--- >>> Driver for the Microchip MCP251x SPI CAN controllers. >>> >>> +config CAN_TCAN4X5X >>> + tristate "Texas Instruments TCAN4X5X SPI CAN controllers" >>> + depends on HAS_DMA >>> + ---help--- >>> + Driver for the Texas Instruments TCAN4X5X SPI CAN controllers. >>> endmenu >>> diff --git a/drivers/net/can/spi/Makefile b/drivers/net/can/spi/Makefile >>> index f59fa3731073..8ecaace7a920 100644 >>> --- a/drivers/net/can/spi/Makefile >>> +++ b/drivers/net/can/spi/Makefile >>> @@ -5,3 +5,4 @@ >>> >>> obj-$(CONFIG_CAN_HI311X) += hi311x.o >>> obj-$(CONFIG_CAN_MCP251X) += mcp251x.o >>> +obj-$(CONFIG_CAN_TCAN4X5X) += tcan4x5x.o >>> diff --git a/drivers/net/can/spi/tcan4x5x.c b/drivers/net/can/spi/tcan4x5x.c >>> new file mode 100644 >>> index 000000000000..ca3753efe35a >>> --- /dev/null >>> +++ b/drivers/net/can/spi/tcan4x5x.c >>> @@ -0,0 +1,1206 @@ >>> +// SPDX-License-Identifier: GPL-2.0 >>> +// SPI to CAN driver for the Texas Instruments TCAN4x5x >>> +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ >>> + >>> +#include <linux/can/core.h> >>> +#include <linux/can/dev.h> >>> +#include <linux/can/led.h> >>> +#include <linux/clk.h> >>> +#include <linux/completion.h> >>> +#include <linux/delay.h> >>> +#include <linux/device.h> >>> +#include <linux/dma-mapping.h> >>> +#include <linux/freezer.h> >>> +#include <linux/interrupt.h> >>> +#include <linux/io.h> >>> +#include <linux/kernel.h> >>> +#include <linux/module.h> >>> +#include <linux/netdevice.h> >>> +#include <linux/of.h> >>> +#include <linux/of_device.h> >>> +#include <linux/regmap.h> >>> +#include <linux/slab.h> >>> +#include <linux/spi/spi.h> >>> +#include <linux/uaccess.h> >>> + >>> +#include <linux/regulator/consumer.h> >>> +#include <linux/gpio/consumer.h> >>> + >>> +#include "tcan4x5x.h" >>> + >>> +#define DEVICE_NAME "tcan4x5x" >>> +#define TCAN4X5X_EXT_CLK_DEF 40000000 >>> + >>> +#define TCAN4X5X_CLEAR_ALL_INT 0xffffffff >>> +#define TCAN4X5X_SET_ALL_INT 0xffffffff >>> + >>> +#define TCAN4X5X_TX_ECHO_SKB_MAX 1 >>> +#define TCAN4X5X_DATA_PKT_OFF 2 >>> +#define TCAN4X5X_WRITE_CMD (0x61 << 24) >>> +#define TCAN4X5X_READ_CMD (0x41 << 24) >>> + >>> +#define TCAN4X5X_SID_SHIFT 18 >>> +#define TCAN4X5X_DLC_SHIFT 16 >>> + >>> +#define TCAN4X5X_ESI_SHIFT 31 >>> +#define TCAN4X5X_XTD_SHIFT 30 >>> +#define TCAN4X5X_RTR_SHIFT 29 >>> +#define TCAN4X5X_FDF_SHIFT 21 >>> +#define TCAN4X5X_BRS_SHIFT 20 >>> +#define TCAN4X5X_DLC_SHIFT 16 >>> + >>> +#define TCAN4X5X_ESI_MASK BIT(31) >>> +#define TCAN4X5X_XTD_MASK BIT(30) >>> +#define TCAN4X5X_RTR_MASK BIT(29) >>> + >>> +#define TCAN4X5X_DLC_MASK 0xf0000 >>> +#define TCAN4X5X_SW_RESET BIT(2) >>> + >>> +#define TCAN4X5X_MODE_SEL_MASK (BIT(7) | BIT(6)) >>> +#define TCAN4X5X_MODE_SLEEP 0x00 >>> +#define TCAN4X5X_MODE_STANDBY BIT(6) >>> +#define TCAN4X5X_MODE_NORMAL BIT(7) >>> +#define TCAN4X5X_MCAN_CONFIGURED BIT(5) >>> +#define TCAN4X5X_WATCHDOG_EN BIT(3) >>> +#define TCAN4X5X_WD_60_MS_TIMER 0 >>> +#define TCAN4X5X_WD_600_MS_TIMER BIT(28) >>> +#define TCAN4X5X_WD_3_S_TIMER BIT(29) >>> +#define TCAN4X5X_WD_6_S_TIMER (BIT(28) | BIT(29)) >>> + >>> +/* Nominal Bit Timing & Prescaler Register */ >>> +#define TCAN4X5X_NSJW_SHIFT 25 >>> +#define TCAN4X5X_NBRP_SHIFT 16 >>> +#define TCAN4X5X_NTSEG1_SHIFT 8 >>> + >>> +#define TCAN4X5X_TDCR_TDCO_SHIFT 8 >>> + >>> +/* Data Bit Timing & Prescaler Register (DBTP) */ >>> +#define DBTP_TDC BIT(23) >>> +#define DBTP_DBRP_SHIFT 16 >>> +#define DBTP_DBRP_MASK (0x1f << DBTP_DBRP_SHIFT) >>> +#define DBTP_DTSEG1_SHIFT 8 >>> +#define DBTP_DTSEG1_MASK (0x1f << DBTP_DTSEG1_SHIFT) >>> +#define DBTP_DTSEG2_SHIFT 4 >>> +#define DBTP_DTSEG2_MASK (0xf << DBTP_DTSEG2_SHIFT) >>> +#define DBTP_DSJW_SHIFT 0 >>> +#define DBTP_DSJW_MASK (0xf << DBTP_DSJW_SHIFT) >>> + >>> +#define TCAN4x5x_QUEUE_LVL_MASK 0x1f >>> +#define TCAN4x5x_QUEUE_IDX_SHIFT 16 >>> +#define TCAN4x5x_QUEUE_IDX_MASK 0x1f00 >>> + >>> +#define TCAN4X5X_CANBUSNOM_INT_EN BIT(14) >>> + >>> +#define TCAN4X5X_NUM_TX_BUF 5 >>> +#define TCAN4X5X_TX_QUEUE_SHIFT 24 >>> +#define TCAN4X5X_TX_NDTB_SHIFT 16 >>> +#define TCAN4X5X_TX_BUF_START 0x324 >>> + >>> +#define TCAN4X5X_NUM_RX_BUF 3 >>> +#define TCAN4X5X_RX_WATER_MARK 2 >>> +#define TCAN4X5X_RX_WATER_MARK_SHIFT 24 >>> +#define TCAN4X5X_RX_FIFO_SZ_SHIFT 16 >>> +#define TCAN4X5X_RX_BUF_START 0x4 >>> + >>> +#define TCAN4X5X_RX_F1DS_SHIFT 4 >>> +#define TCAN4X5X_RX_RBDS_SHIFT 8 >>> + >>> +#define TCAN4X5X_RX_FIFO0_MESSAGE BIT(0) >>> +#define TCAN4X5X_RX_FIFO1_MESSAGE BIT(4) >>> +#define TCAN4X5X_RX_BUFFER_MESSAGE BIT(19) >>> +#define TCAN4X5X_RX_INDEX_MASK 0x3f00 >>> +#define TCAN4X5X_RX_INDEX_SHIFT 8 >>> + >>> +#define TCAN4X5X_RX_ADDR_OFFSET 0x8000 >>> +#define TCAN4X5X_RX_BUF_ADDR_OFFSET 0x8100 >>> +#define TCAN4X5X_RX_ADDR_MASK 0xffff >>> + >>> +#define TCAN4X5X_ERR_PROTOCOL_MASK 0x7 >>> +#define TCAN4X5X_ERR_STUFERR 0x1 >>> +#define TCAN4X5X_ERR_FRMERR 0x2 >>> +#define TCAN4X5X_ERR_ACKERR 0x3 >>> +#define TCAN4X5X_ERR_BIT1ERR 0x4 >>> +#define TCAN4X5X_ERR_BIT0ERR 0x5 >>> +#define TCAN4X5X_ERR_CRCERR 0x6 >>> + >>> +/* Interrupt bits */ >>> +#define TCAN4X5X_CANBUSTERMOPEN_INT_EN BIT(30) >>> +#define TCAN4X5X_CANHCANL_INT_EN BIT(29) >>> +#define TCAN4X5X_CANHBAT_INT_EN BIT(28) >>> +#define TCAN4X5X_CANLGND_INT_EN BIT(27) >>> +#define TCAN4X5X_CANBUSOPEN_INT_EN BIT(26) >>> +#define TCAN4X5X_CANBUSGND_INT_EN BIT(25) >>> +#define TCAN4X5X_CANBUSBAT_INT_EN BIT(24) >>> +#define TCAN4X5X_UVSUP_INT_EN BIT(22) >>> +#define TCAN4X5X_UVIO_INT_EN BIT(21) >>> +#define TCAN4X5X_TSD_INT_EN BIT(19) >>> +#define TCAN4X5X_ECCERR_INT_EN BIT(16) >>> +#define TCAN4X5X_CANINT_INT_EN BIT(15) >>> +#define TCAN4X5X_LWU_INT_EN BIT(14) >>> +#define TCAN4X5X_CANSLNT_INT_EN BIT(10) >>> +#define TCAN4X5X_CANDOM_INT_EN BIT(8) >>> +#define TCAN4X5X_CANBUS_ERR_INT_EN BIT(5) >>> +#define TCAN4X5X_BUS_FAULT BIT(4) >>> +#define TCAN4X5X_MCAN_INT BIT(1) >>> +#define TCAN4X5X_ENABLE_ALL_INT (TCAN4X5X_MCAN_INT | \ >>> + TCAN4X5X_BUS_FAULT | \ >>> + TCAN4X5X_CANBUS_ERR_INT_EN | \ >>> + TCAN4X5X_CANINT_INT_EN) >>> + >>> +/* MCAN Interrupt bits */ >>> +#define TCAN4X5X_MCAN_IR_ARA BIT(29) >>> +#define TCAN4X5X_MCAN_IR_PED BIT(28) >>> +#define TCAN4X5X_MCAN_IR_PEA BIT(27) >>> +#define TCAN4X5X_MCAN_IR_WD BIT(26) >>> +#define TCAN4X5X_MCAN_IR_BO BIT(25) >>> +#define TCAN4X5X_MCAN_IR_EW BIT(24) >>> +#define TCAN4X5X_MCAN_IR_EP BIT(23) >>> +#define TCAN4X5X_MCAN_IR_ELO BIT(22) >>> +#define TCAN4X5X_MCAN_IR_BEU BIT(21) >>> +#define TCAN4X5X_MCAN_IR_BEC BIT(20) >>> +#define TCAN4X5X_MCAN_IR_DRX BIT(19) >>> +#define TCAN4X5X_MCAN_IR_TOO BIT(18) >>> +#define TCAN4X5X_MCAN_IR_MRAF BIT(17) >>> +#define TCAN4X5X_MCAN_IR_TSW BIT(16) >>> +#define TCAN4X5X_MCAN_IR_TEFL BIT(15) >>> +#define TCAN4X5X_MCAN_IR_TEFF BIT(14) >>> +#define TCAN4X5X_MCAN_IR_TEFW BIT(13) >>> +#define TCAN4X5X_MCAN_IR_TEFN BIT(12) >>> +#define TCAN4X5X_MCAN_IR_TFE BIT(11) >>> +#define TCAN4X5X_MCAN_IR_TCF BIT(10) >>> +#define TCAN4X5X_MCAN_IR_TC BIT(9) >>> +#define TCAN4X5X_MCAN_IR_HPM BIT(8) >>> +#define TCAN4X5X_MCAN_IR_RF1L BIT(7) >>> +#define TCAN4X5X_MCAN_IR_RF1F BIT(6) >>> +#define TCAN4X5X_MCAN_IR_RF1W BIT(5) >>> +#define TCAN4X5X_MCAN_IR_RF1N BIT(4) >>> +#define TCAN4X5X_MCAN_IR_RF0L BIT(3) >>> +#define TCAN4X5X_MCAN_IR_RF0F BIT(2) >>> +#define TCAN4X5X_MCAN_IR_RF0W BIT(1) >>> +#define TCAN4X5X_MCAN_IR_RF0N BIT(0) >>> +#define TCAN4X5X_ENABLE_MCAN_INT (TCAN4X5X_MCAN_IR_TC | \ >>> + TCAN4X5X_MCAN_IR_RF0N | \ >>> + TCAN4X5X_MCAN_IR_RF1N | \ >>> + TCAN4X5X_MCAN_IR_RF0F | \ >>> + TCAN4X5X_MCAN_IR_RF1F) >>> + >>> +/* CCR bits */ >>> +#define TCAN4X5X_CCCR_NISO_BOSCH BIT(15) >>> +#define TCAN4X5X_CCCR_TXP BIT(15) >>> +#define TCAN4X5X_CCCR_EFBI BIT(13) >>> +#define TCAN4X5X_CCCR_PXHD_DIS BIT(12) >>> +#define TCAN4X5X_CCCR_BRSE BIT(9) >>> +#define TCAN4X5X_CCCR_FDOE BIT(8) >>> +#define TCAN4X5X_CCCR_TEST BIT(7) >>> +#define TCAN4X5X_CCCR_DAR_DIS BIT(6) >>> +#define TCAN4X5X_CCCR_MON BIT(5) >>> +#define TCAN4X5X_CCCR_CSR BIT(4) >>> +#define TCAN4X5X_CCCR_CSA BIT(3) >>> +#define TCAN4X5X_CCCR_ASM BIT(2) >>> +#define TCAN4X5X_CCCR_CCE BIT(1) >>> +#define TCAN4X5X_CCCR_INIT BIT(0) >>> + >>> +#define TCAN4X5X_EINT0 BIT(0) >>> +#define TCAN4X5X_EINT1 BIT(1) >>> + >>> +struct tcan4x5x_rx_regs { >>> + u32 fifo_status_reg; >>> + u32 fifo_config_reg; >>> + u32 fifo_ack_reg; >>> + u32 rx_buf_shift; >>> +}; >>> + >>> +struct tcan4x5x_rx_regs tcan4x5x_fifo_regs[] = { >>> + { TCAN4X5X_MCAN_RXF0S, TCAN4X5X_MCAN_RXF0C, TCAN4X5X_MCAN_RXF0A, 0}, >>> + { TCAN4X5X_MCAN_RXF1S, TCAN4X5X_MCAN_RXF1C, TCAN4X5X_MCAN_RXF1A, 4}, >>> + { TCAN4X5X_MCAN_NDAT1, TCAN4X5X_MCAN_RXBC, TCAN4X5X_MCAN_NDAT1, 8}, >>> +}; >>> + >>> +enum tcan4x5x_data_size { >>> + TCAN4X5X_8_BYTE = 0, >>> + TCAN4X5X_12_BYTE, >>> + TCAN4X5X_16_BYTE, >>> + TCAN4X5X_20_BYTE, >>> + TCAN4X5X_24_BYTE, >>> + TCAN4X5X_32_BYTE, >>> + TCAN4X5X_48_BYTE, >>> + TCAN4X5X_64_BYTE, >>> +}; >>> + >>> +static const struct can_bittiming_const tcan4x5x_bittiming_const = { >>> + .name = DEVICE_NAME, >>> + .tseg1_min = 2, >>> + .tseg1_max = 31, >>> + .tseg2_min = 2, >>> + .tseg2_max = 16, >>> + .sjw_max = 16, >>> + .brp_min = 1, >>> + .brp_max = 32, >>> + .brp_inc = 1, >>> +}; >>> + >>> +static const struct can_bittiming_const tcan4x5x_data_bittiming_const = { >>> + .name = DEVICE_NAME, >>> + .tseg1_min = 1, >>> + .tseg1_max = 32, >>> + .tseg2_min = 1, >>> + .tseg2_max = 16, >>> + .sjw_max = 16, >>> + .brp_min = 1, >>> + .brp_max = 32, >>> + .brp_inc = 1, >>> +}; >>> + >>> +static void tcan4x5x_clean(struct net_device *net) >>> +{ >>> + struct tcan4x5x_priv *priv = netdev_priv(net); >>> + >>> + if (priv->tx_skb || priv->tx_len) >>> + net->stats.tx_errors++; >>> + if (priv->tx_skb) >>> + dev_kfree_skb(priv->tx_skb); >>> + if (priv->tx_len) >>> + can_free_echo_skb(priv->net, 0); >>> + >>> + priv->tx_skb = NULL; >>> + priv->tx_len = 0; >>> +} >>> + >>> +static int regmap_spi_gather_write(void *context, const void *reg, >>> + size_t reg_len, const void *val, >>> + size_t val_len) >>> +{ >>> + struct device *dev = context; >>> + struct spi_device *spi = to_spi_device(dev); >>> + u32 addr; >>> + struct spi_message m; >>> + struct spi_transfer t[2] = {{ .tx_buf = &addr, .len = 4, .cs_change = 0,}, >>> + { .tx_buf = val, .len = val_len, },}; >>> + >>> + addr = TCAN4X5X_WRITE_CMD | (*((u16 *)reg) << 8) | val_len >> 2; >>> + >>> + spi_message_init(&m); >>> + spi_message_add_tail(&t[0], &m); >>> + spi_message_add_tail(&t[1], &m); >>> + >>> + return spi_sync(spi, &m); >>> +} >>> + >>> +static int tcan4x5x_regmap_write(void *context, const void *data, size_t count) >>> +{ >>> + u16 *reg = (u16 *)(data); >>> + const u32 *val = data + 2; >>> + >>> + return regmap_spi_gather_write(context, reg, 2, val, count - 2); >>> +} >>> + >>> +static int regmap_spi_async_write(void *context, >>> + const void *reg, size_t reg_len, >>> + const void *val, size_t val_len, >>> + struct regmap_async *a) >>> +{ >>> + return -ENOTSUPP; >>> +} >>> + >>> +static struct regmap_async *regmap_spi_async_alloc(void) >>> +{ >>> + return NULL; >>> +} >>> + >>> +static int tcan4x5x_regmap_read(void *context, >>> + const void *reg, size_t reg_size, >>> + void *val, size_t val_size) >>> +{ >>> + struct device *dev = context; >>> + struct spi_device *spi = to_spi_device(dev); >>> + >>> + u32 addr = TCAN4X5X_READ_CMD | (*((u16 *)reg) << 8) | val_size >> 2; >>> + >>> + return spi_write_then_read(spi, &addr, 4, val, val_size); >>> +} >>> + >>> +static struct regmap_bus tcan4x5x_bus = { >>> + .write = tcan4x5x_regmap_write, >>> + .gather_write = regmap_spi_gather_write, >>> + .async_write = regmap_spi_async_write, >>> + .async_alloc = regmap_spi_async_alloc, >>> + .read = tcan4x5x_regmap_read, >>> + .read_flag_mask = 0x00, >>> + .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, >>> + .val_format_endian_default = REGMAP_ENDIAN_NATIVE, >>> +}; >>> + >>> +static uint8_t tcan4x5x_dlc_conv(uint8_t input) >>> +{ >>> + const static u8 lookup[7] = {12, 16, 20, 24, 32, 48, 64}; >>> + >>> + if (input < 9) >>> + return input; >>> + >>> + if (input < 16) >>> + return lookup[(unsigned int)(input - 9)]; >>> + >>> + return 0; >>> +} >>> + >>> +static uint8_t tcan4x5x_txrxesc_value(uint8_t input) >>> +{ >>> + const u8 lookup[8] = {8, 12, 16, 20, 24, 32, 48, 64}; >>> + return lookup[(unsigned int)(input & 0x07)]; >>> +} >>> + >>> +static void tcan4x5x_hw_tx(struct tcan4x5x_priv *tcan4x5x) >>> +{ >>> + u32 sid, eid, exide, rtr, brs, esi, fdf, xtd, data_len; >>> + u32 mcan_address, mcan_tx_element_sz; >>> + int queue_stat, queue_lvl, queue_idx; >>> + struct canfd_frame *fd_frame; >>> + struct can_frame *frame; >>> + int tx_element_sz, i, temp; >>> + canid_t frame_id; >>> + u8 dlc_len; >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXFQS, &queue_stat); >>> + queue_lvl = queue_stat & TCAN4x5x_QUEUE_LVL_MASK; >>> + queue_idx = (queue_stat & TCAN4x5x_QUEUE_IDX_MASK) >> TCAN4x5x_QUEUE_IDX_SHIFT; >>> + >>> + if (tcan4x5x->tx_skb->len == CAN_MTU) { >>> + fd_frame = NULL; >>> + frame = (struct can_frame *)tcan4x5x->tx_skb->data; >>> + frame_id = frame->can_id; >>> + dlc_len = frame->can_dlc; >>> + data_len = ((dlc_len % 4) + dlc_len) / 4; >>> + brs = 0; >>> + } else if (tcan4x5x->tx_skb->len == CANFD_MTU) { >>> + frame = NULL; >>> + fd_frame = (struct canfd_frame *)tcan4x5x->tx_skb->data; >>> + frame_id = fd_frame->can_id; >>> + dlc_len = fd_frame->len; >>> + data_len = ((dlc_len % 4) + dlc_len) / 4; >>> + brs = fd_frame->flags & CANFD_BRS; >>> + esi = fd_frame->flags & CANFD_ESI; >>> + fdf = 1; >>> + } else { >>> + return; >>> + } >>> + >>> + eid = frame_id & CAN_EFF_MASK; >>> + rtr = (frame_id & CAN_RTR_FLAG) ? 1 : 0; >>> + >>> + exide = (frame_id & CAN_EFF_FLAG) ? 1 : 0; >>> + if (exide) { >>> + sid = frame_id & CAN_EFF_MASK; >>> + xtd = 1; >>> + } else { >>> + sid = (frame_id & CAN_SFF_MASK) << TCAN4X5X_SID_SHIFT; >>> + xtd = 0; >>> + } >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBC, &mcan_address); >>> + >>> + mcan_address = (mcan_address & 0xffff) + TCAN4X5X_MRAM_START; >>> + temp = (uint8_t)((mcan_address >> 24) & 0x3F); >>> + >>> + tx_element_sz = temp > 32 ? 32 : temp; >>> + temp = (uint8_t)((mcan_address >> 16) & 0x3F); >>> + >>> + tx_element_sz += temp > 32 ? 32 : temp; >>> + mcan_address += ((uint32_t)tx_element_sz * queue_idx); >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_TXESC, &mcan_tx_element_sz); >>> + tx_element_sz = tcan4x5x_txrxesc_value(mcan_tx_element_sz & 0x07) + 8; >>> + mcan_address += ((uint32_t)tx_element_sz * 0); >>> + >>> + tx_element_sz = (tcan4x5x_dlc_conv(dlc_len & 0x0F) + 8) >> 2; >>> + if (tcan4x5x_dlc_conv(dlc_len & 0x0F) % 4) >>> + tx_element_sz += 1; >>> + >>> + tcan4x5x->spi_tx_buf[0] = esi << TCAN4X5X_ESI_SHIFT | >>> + xtd << TCAN4X5X_XTD_SHIFT | >>> + rtr << TCAN4X5X_RTR_SHIFT | sid; >>> + >>> + tcan4x5x->spi_tx_buf[1] = fdf << TCAN4X5X_FDF_SHIFT | >>> + brs << TCAN4X5X_BRS_SHIFT | dlc_len << TCAN4X5X_DLC_SHIFT; >>> + >>> + if (tcan4x5x->tx_skb->len == CAN_MTU) >>> + memcpy(tcan4x5x->spi_tx_buf + TCAN4X5X_DATA_PKT_OFF, >>> + frame->data, dlc_len); >>> + else >>> + memcpy(tcan4x5x->spi_tx_buf + TCAN4X5X_DATA_PKT_OFF, >>> + fd_frame->data, dlc_len); >>> + >>> + for (i = dlc_len + 1; i < TCAN4X5X_BUF_LEN / 4; i++) >>> + tcan4x5x->spi_tx_buf[i] = 0; >>> + >>> + regmap_bulk_write(tcan4x5x->regmap, mcan_address, tcan4x5x->spi_tx_buf, >>> + TCAN4X5X_BUF_LEN); >>> + >>> + regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBAR, (1 << (queue_idx))); >>> +} >>> + >>> +int tcan4x5x_hw_rx(struct tcan4x5x_priv *tcan4x5x) >>> +{ >>> + u32 queue_idx, fifo_idx, fifo_start_addr, rx_buf_size, msg_type; >>> + u32 data_buffer[TCAN4X5X_BUF_LEN] = {0x0}; >>> + u32 rx_header[2] = {0x0}; >>> + struct tcan4x5x_rx_regs *buffer_regs; >>> + struct canfd_frame *fd_frame; >>> + int dlc_len, data_len; >>> + struct sk_buff *skb; >>> + >>> + skb = alloc_canfd_skb(tcan4x5x->net, &fd_frame); >>> + if (!skb) { >>> + dev_err(&tcan4x5x->spi->dev, "cannot allocate RX skb\n"); >>> + tcan4x5x->net->stats.rx_dropped++; >>> + return -ENOMEM; >>> + } >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, &msg_type); >>> + if (msg_type & TCAN4X5X_RX_FIFO0_MESSAGE) { >>> + buffer_regs = &tcan4x5x_fifo_regs[0]; >>> + } else if (msg_type & TCAN4X5X_RX_FIFO1_MESSAGE) { >>> + buffer_regs = &tcan4x5x_fifo_regs[1]; >>> + } else if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) { >>> + buffer_regs = &tcan4x5x_fifo_regs[2]; >>> + } else { >>> + buffer_regs = NULL; >>> + return -EINVAL; >>> + } >>> + >>> + rx_buf_size = TCAN4X5X_BUF_LEN; >>> + >>> + /* Determine which FIFO needs service */ >>> + regmap_read(tcan4x5x->regmap, buffer_regs->fifo_status_reg, &fifo_idx); >>> + if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) >>> + queue_idx = fifo_idx - 1; >>> + else >>> + queue_idx = (TCAN4X5X_RX_INDEX_MASK & fifo_idx) >> TCAN4X5X_RX_INDEX_SHIFT; >>> + >>> + /* Calculate the FIFO start address to service */ >>> + regmap_read(tcan4x5x->regmap, buffer_regs->fifo_config_reg, &fifo_start_addr); >>> + fifo_start_addr = (TCAN4X5X_RX_ADDR_MASK & fifo_start_addr); >>> + if (msg_type & TCAN4X5X_RX_BUFFER_MESSAGE) >>> + fifo_start_addr = fifo_start_addr + TCAN4X5X_RX_BUF_ADDR_OFFSET + >>> + (rx_buf_size * queue_idx); >>> + else >>> + fifo_start_addr = fifo_start_addr + TCAN4X5X_RX_ADDR_OFFSET + >>> + (rx_buf_size * queue_idx); >>> + >>> + regmap_bulk_read(tcan4x5x->regmap, fifo_start_addr, rx_header, 2); >>> + >>> + dlc_len = (rx_header[1] & TCAN4X5X_DLC_MASK) >> TCAN4X5X_DLC_SHIFT; >>> + if (dlc_len <= 8) >>> + data_len = dlc_len; >>> + else >>> + data_len = tcan4x5x_txrxesc_value(dlc_len); >>> + >>> + regmap_bulk_read(tcan4x5x->regmap, fifo_start_addr + 8, >>> + data_buffer, data_len / 4); >>> + >>> + /* Acknowledge receipt of the data */ >>> + regmap_write(tcan4x5x->regmap, buffer_regs->fifo_ack_reg, queue_idx); >>> + >>> + if (rx_header[0] & TCAN4X5X_XTD_MASK) { >>> + fd_frame->can_id = CAN_EFF_FLAG; >>> + fd_frame->can_id |= (rx_header[0] & CAN_EFF_MASK); >>> + } else { >>> + fd_frame->can_id |= ((rx_header[0] >> TCAN4X5X_SID_SHIFT) & >>> + CAN_SFF_MASK); >>> + } >>> + >>> + if (rx_header[0] & TCAN4X5X_RTR_MASK) >>> + fd_frame->can_id |= CAN_RTR_FLAG; >>> + >>> + if (rx_header[0] & TCAN4X5X_ESI_MASK) { >>> + fd_frame->can_id |= CAN_ERR_FLAG; >>> + fd_frame->flags |= CANFD_ESI; >>> + netdev_dbg(tcan4x5x->net, "ESI Error\n"); >>> + } >>> + >>> + fd_frame->len = data_len; >>> + memcpy(fd_frame->data, data_buffer, fd_frame->len); >>> + >>> + tcan4x5x->net->stats.rx_packets++; >>> + tcan4x5x->net->stats.rx_bytes += fd_frame->len; >>> + >>> + can_led_event(tcan4x5x->net, CAN_LED_EVENT_RX); >>> + netif_rx_ni(skb); >>> + >>> + return 0; >>> +} >>> + >>> +static void tcan4x5x_sleep(struct spi_device *spi) >>> +{ >>> + struct tcan4x5x_priv *tcan4x5x = spi_get_drvdata(spi); >>> + >>> + regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, >>> + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_STANDBY); >>> +} >>> + >>> +static int tcan4x5x_reset(struct net_device *net) >>> +{ >>> + struct tcan4x5x_priv *tcan4x5x = netdev_priv(net); >>> + >>> + if (tcan4x5x->reset_gpio) { >>> + gpiod_set_value_cansleep(tcan4x5x->reset_gpio, 1); >>> + udelay(10); >>> + gpiod_set_value_cansleep(tcan4x5x->reset_gpio, 0); >>> + } else { >>> + regmap_write(tcan4x5x->regmap, TCAN4X5X_CONFIG, >>> + TCAN4X5X_SW_RESET); >>> + } >>> + >>> + return 0; >>> +} >>> + >>> +static int tcan4x5x_power_enable(struct regulator *reg, int enable) >>> +{ >>> + if (IS_ERR_OR_NULL(reg)) >>> + return 0; >>> + >>> + if (enable) >>> + return regulator_enable(reg); >>> + else >>> + return regulator_disable(reg); >>> +} >>> + >>> +static irqreturn_t tcan4x5x_can_ist(int irq, void *dev_id) >>> +{ >>> + struct tcan4x5x_priv *tcan4x5x = dev_id; >>> + struct spi_device *spi = tcan4x5x->spi; >>> + struct net_device *net = tcan4x5x->net; >>> + enum can_state new_state; >>> + int intf, eflag, mcan_intf; >>> + >>> + mutex_lock(&tcan4x5x->tcan4x5x_lock); >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_INT_FLAGS, &intf); >>> + if (intf & TCAN4X5X_MCAN_INT) >>> + tcan4x5x_hw_rx(tcan4x5x); >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, &mcan_intf); >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_STATUS, &eflag); >>> + /* Update can state */ >>> + if (eflag & TCAN4X5X_MCAN_IR_BO) >>> + new_state = CAN_STATE_BUS_OFF; >>> + else if (eflag & TCAN4X5X_MCAN_IR_EP) >>> + new_state = CAN_STATE_ERROR_PASSIVE; >>> + else if (eflag & TCAN4X5X_MCAN_IR_EW) >>> + new_state = CAN_STATE_ERROR_WARNING; >>> + else >>> + new_state = CAN_STATE_ERROR_ACTIVE; >>> + >>> + if (new_state != tcan4x5x->can.state) { >>> + struct can_frame *cf; >>> + struct sk_buff *skb; >>> + enum can_state rx_state, tx_state; >>> + u32 error_count; >>> + >>> + skb = alloc_can_err_skb(net, &cf); >>> + if (!skb) >>> + goto ist_out; >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_ECR, &error_count); >>> + cf->data[6] = error_count & 0xff; >>> + cf->data[7] = error_count & 0x7f00 >> 8; >>> + tx_state = cf->data[6] >= cf->data[7] ? new_state : 0; >>> + rx_state = cf->data[6] <= cf->data[7] ? new_state : 0; >>> + can_change_state(net, cf, tx_state, rx_state); >>> + netif_rx_ni(skb); >>> + >>> + if (new_state == CAN_STATE_BUS_OFF) { >>> + can_bus_off(net); >>> + if (tcan4x5x->can.restart_ms == 0) { >>> + tcan4x5x->force_quit = 1; >>> + tcan4x5x_sleep(spi); >>> + goto ist_out; >>> + } >>> + } >>> + } >>> + >>> + /* Update bus errors */ >>> + if ((intf & TCAN4X5X_BUS_FAULT) && >>> + (tcan4x5x->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) { >>> + struct can_frame *cf; >>> + struct sk_buff *skb; >>> + u32 psr_err, error_count; >>> + >>> + /* Check for protocol errors */ >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_PSR, &psr_err); >>> + if (psr_err & TCAN4X5X_ERR_PROTOCOL_MASK) { >>> + skb = alloc_can_err_skb(net, &cf); >>> + if (!skb) >>> + goto ist_out; >>> + >>> + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; >>> + tcan4x5x->can.can_stats.bus_error++; >>> + tcan4x5x->net->stats.rx_errors++; >>> + if (psr_err & TCAN4X5X_ERR_BIT0ERR) >>> + cf->data[2] |= CAN_ERR_PROT_BIT0; >>> + else if (psr_err & TCAN4X5X_ERR_BIT1ERR) >>> + cf->data[2] |= CAN_ERR_PROT_BIT1; >>> + else if (psr_err & TCAN4X5X_ERR_FRMERR) >>> + cf->data[2] |= CAN_ERR_PROT_FORM; >>> + else if (psr_err & TCAN4X5X_ERR_STUFERR) >>> + cf->data[2] |= CAN_ERR_PROT_STUFF; >>> + else if (psr_err & TCAN4X5X_ERR_CRCERR) >>> + cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ; >>> + else if (psr_err & TCAN4X5X_ERR_ACKERR) >>> + cf->data[3] |= CAN_ERR_PROT_LOC_ACK; >>> + >>> + regmap_read(tcan4x5x->regmap, TCAN4X5X_MCAN_ECR, >>> + &error_count); >>> + cf->data[6] = error_count & 0xff; >>> + cf->data[7] = error_count & 0x7f00 >> 8; >>> + netdev_dbg(tcan4x5x->net, "Bus Error\n"); >>> + netif_rx_ni(skb); >>> + } >>> + } >>> + >>> + if (mcan_intf & TCAN4X5X_MCAN_IR_TC) { >>> + net->stats.tx_packets++; >>> + net->stats.tx_bytes += tcan4x5x->tx_len - 1; >>> + can_led_event(net, CAN_LED_EVENT_TX); >>> + if (tcan4x5x->tx_len) { >>> + can_get_echo_skb(net, 0); >>> + tcan4x5x->tx_len = 0; >>> + } >>> + netif_wake_queue(net); >>> + } >>> + >>> +ist_out: >>> + regmap_write(tcan4x5x->regmap, TCAN4X5X_INT_FLAGS, TCAN4X5X_CLEAR_ALL_INT); >>> + regmap_write(tcan4x5x->regmap, TCAN4X5X_STATUS, TCAN4X5X_CLEAR_ALL_INT); >>> + regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_FLAG, >>> + TCAN4X5X_CLEAR_ALL_INT); >>> + >>> + mutex_unlock(&tcan4x5x->tcan4x5x_lock); >>> + return IRQ_HANDLED; >>> +} >>> + >>> +static int tcan4x5x_do_set_bittiming(struct net_device *net) >>> +{ >>> + struct tcan4x5x_priv *priv = netdev_priv(net); >>> + struct can_bittiming *bt = &priv->can.bittiming; >>> + struct can_bittiming *dbt = &priv->can.data_bittiming; >>> + u16 brp, sjw, tseg1, tseg2; >>> + int ret; >>> + u32 val; >>> + >>> + brp = bt->brp - 1; >>> + sjw = bt->sjw - 1; >>> + tseg1 = bt->prop_seg + bt->phase_seg1 - 1; >>> + tseg2 = bt->phase_seg2 - 1; >>> + val = (brp << TCAN4X5X_NBRP_SHIFT) | (sjw << TCAN4X5X_NSJW_SHIFT) | >>> + (tseg1 << TCAN4X5X_NTSEG1_SHIFT) | tseg2; >>> + >>> + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_NBTP, val); >>> + if (ret) >>> + return -EIO; >>> + >>> + if (priv->can.ctrlmode & CAN_CTRLMODE_FD) { >>> + val = 0; >>> + brp = dbt->brp - 1; >>> + sjw = dbt->sjw - 1; >>> + tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1; >>> + tseg2 = dbt->phase_seg2 - 1; >>> + >>> + /* TDC is only needed for bitrates beyond 2.5 MBit/s. >>> + * This is mentioned in the "Bit Time Requirements for CAN FD" >>> + * paper presented at the International CAN Conference 2013 >>> + */ >>> + if (dbt->bitrate > 2500000) { >>> + u32 tdco, ssp; >>> + >>> + /* Use the same value of secondary sampling point >>> + * as the data sampling point >>> + */ >>> + ssp = dbt->sample_point; >>> + >>> + /* Equation based on Bosch's M_CAN User Manual's >>> + * Transmitter Delay Compensation Section >>> + */ >>> + tdco = (priv->can.clock.freq / 1000) * >>> + ssp / dbt->bitrate; >>> + >>> + /* Max valid TDCO value is 127 */ >>> + if (tdco > 127) { >>> + netdev_warn(net, "TDCO value of %u is beyond maximum. Using maximum possible value\n", >>> + tdco); >>> + tdco = 127; >>> + } >>> + >>> + val |= DBTP_TDC; >>> + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_TDCR, >>> + tdco << TCAN4X5X_TDCR_TDCO_SHIFT); >>> + if (ret) >>> + return -EIO; >>> + } >>> + >>> + val |= (brp << DBTP_DBRP_SHIFT) | >>> + (sjw << DBTP_DSJW_SHIFT) | >>> + (tseg1 << DBTP_DTSEG1_SHIFT) | >>> + (tseg2 << DBTP_DTSEG2_SHIFT); >>> + >>> + ret = regmap_write(priv->regmap, TCAN4X5X_MCAN_DBTP, val); >>> + } >>> + >>> + return ret; >>> +} >>> + >>> +static int tcan4x5x_setup(struct spi_device *spi) >>> +{ >>> + struct tcan4x5x_priv *tcan4x5x = spi_get_drvdata(spi); >>> + int start_reg = TCAN4X5X_MRAM_START; >>> + int end_reg = start_reg + TCAN4X5X_MRAM_SIZE; >>> + int ret; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_REG, >>> + TCAN4X5X_CLEAR_ALL_INT); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_INT_EN, >>> + TCAN4X5X_ENABLE_MCAN_INT); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_CCCR, >>> + TCAN4X5X_CCCR_INIT | TCAN4X5X_CCCR_CCE); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_CCCR, >>> + TCAN4X5X_CCCR_INIT | TCAN4X5X_CCCR_CCE | >>> + TCAN4X5X_CCCR_FDOE | TCAN4X5X_CCCR_BRSE); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = tcan4x5x_do_set_bittiming(tcan4x5x->net); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXESC, >>> + TCAN4X5X_64_BYTE); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBC, >>> + (TCAN4X5X_NUM_TX_BUF << TCAN4X5X_TX_QUEUE_SHIFT | >>> + TCAN4X5X_TX_BUF_START)); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_RXF0C, >>> + (TCAN4X5X_RX_WATER_MARK << TCAN4X5X_RX_WATER_MARK_SHIFT | >>> + TCAN4X5X_NUM_RX_BUF << TCAN4X5X_RX_FIFO_SZ_SHIFT | >>> + TCAN4X5X_RX_BUF_START)); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_RXESC, >>> + (TCAN4X5X_64_BYTE << TCAN4X5X_RX_RBDS_SHIFT | >>> + TCAN4X5X_64_BYTE << TCAN4X5X_RX_F1DS_SHIFT | >>> + TCAN4X5X_64_BYTE)); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_TXBTIE, >>> + TCAN4X5X_SET_ALL_INT); >>> + if (ret) >>> + return -EIO; >>> + >>> + >>> + ret = regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, >>> + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_NORMAL); >>> + if (ret) >>> + return -EIO; >>> + >>> + ret = regmap_write(tcan4x5x->regmap, TCAN4X5X_MCAN_ILE, TCAN4X5X_EINT0); >>> + if (ret) >>> + return -EIO; >>> + >>> + /* Zero out the MCAN buffers */ >>> + while (start_reg < end_reg) { >>> + regmap_write(tcan4x5x->regmap, start_reg, 0); >>> + start_reg += 4; >>> + } >>> + >>> + return ret; >>> +} >>> + >>> +static void tcan4x5x_tx_work_handler(struct work_struct *ws) >>> +{ >>> + struct tcan4x5x_priv *tcan4x5x = container_of(ws, struct tcan4x5x_priv, >>> + tx_work); >>> + struct net_device *net = tcan4x5x->net; >>> + struct can_frame *frame; >>> + >>> + mutex_lock(&tcan4x5x->tcan4x5x_lock); >>> + if (tcan4x5x->tx_skb) { >>> + if (tcan4x5x->can.state == CAN_STATE_BUS_OFF) { >>> + tcan4x5x_clean(net); >>> + } else { >>> + frame = (struct can_frame *)tcan4x5x->tx_skb->data; >>> + tcan4x5x_hw_tx(tcan4x5x); >>> + tcan4x5x->tx_len = 1 + frame->can_dlc; >>> + can_put_echo_skb(tcan4x5x->tx_skb, net, 0); >>> + tcan4x5x->tx_skb = NULL; >>> + } >>> + } >>> + mutex_unlock(&tcan4x5x->tcan4x5x_lock); >>> +} >>> + >>> +static void tcan4x5x_restart_work_handler(struct work_struct *ws) >>> +{ >>> + struct tcan4x5x_priv *tcan4x5x = container_of(ws, struct tcan4x5x_priv, >>> + restart_work); >>> + struct spi_device *spi = tcan4x5x->spi; >>> + struct net_device *net = tcan4x5x->net; >>> + >>> + mutex_lock(&tcan4x5x->tcan4x5x_lock); >>> + if (tcan4x5x->after_suspend) { >>> + tcan4x5x_reset(net); >>> + tcan4x5x_setup(spi); >>> + if (tcan4x5x->after_suspend & AFTER_SUSPEND_RESTART) { >>> + tcan4x5x_setup(spi); >>> + } else if (tcan4x5x->after_suspend & AFTER_SUSPEND_UP) { >>> + netif_device_attach(net); >>> + tcan4x5x_clean(net); >>> + tcan4x5x_setup(spi); >>> + netif_wake_queue(net); >>> + } else { >>> + tcan4x5x_sleep(spi); >>> + } >>> + tcan4x5x->after_suspend = 0; >>> + tcan4x5x->force_quit = 0; >>> + } >>> + >>> + if (tcan4x5x->restart_tx) { >>> + tcan4x5x->restart_tx = 0; >>> + tcan4x5x_reset(net); >>> + tcan4x5x_clean(net); >>> + tcan4x5x_setup(spi); >>> + netif_wake_queue(net); >>> + } >>> + mutex_unlock(&tcan4x5x->tcan4x5x_lock); >>> +} >>> + >>> +static int tcan4x5x_open(struct net_device *net) >>> +{ >>> + struct tcan4x5x_priv *priv = netdev_priv(net); >>> + struct spi_device *spi = priv->spi; >>> + unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_LOW; >>> + int ret; >>> + >>> + ret = open_candev(net); >>> + if (ret) >>> + return ret; >>> + >>> + mutex_lock(&priv->tcan4x5x_lock); >>> + tcan4x5x_power_enable(priv->power, 1); >>> + >>> + priv->force_quit = 0; >>> + priv->tx_skb = NULL; >>> + priv->tx_len = 0; >>> + >>> + ret = request_threaded_irq(priv->irq, NULL, tcan4x5x_can_ist, >>> + flags, DEVICE_NAME, priv); >>> + if (ret) { >>> + dev_err(&spi->dev, "failed to acquire irq %d %i\n", >>> + priv->irq, ret); >>> + goto out_close; >>> + } >>> + >>> + priv->wq = alloc_workqueue("tcan4x5x_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM, >>> + 0); >>> + if (!priv->wq) { >>> + ret = -ENOMEM; >>> + goto out_free_irq; >>> + } >>> + >>> + INIT_WORK(&priv->tx_work, tcan4x5x_tx_work_handler); >>> + INIT_WORK(&priv->restart_work, tcan4x5x_restart_work_handler); >>> + >>> + priv->spi_tx_buf = devm_kzalloc(&spi->dev, TCAN4X5X_BUF_LEN, >>> + GFP_KERNEL); >>> + if (!priv->spi_tx_buf) { >>> + ret = -ENOMEM; >>> + goto out_free_wq; >>> + } >>> + >>> + priv->spi_rx_buf = devm_kzalloc(&spi->dev, TCAN4X5X_BUF_LEN, >>> + GFP_KERNEL); >>> + if (!priv->spi_rx_buf) { >>> + ret = -ENOMEM; >>> + goto out_free_wq; >>> + } >>> + >>> + if (priv->wake_gpio) >>> + gpiod_set_value_cansleep(priv->wake_gpio, 1); >>> + >>> + ret = tcan4x5x_reset(net); >>> + if (ret) >>> + goto out_free_wq; >>> + >>> + ret = tcan4x5x_setup(spi); >>> + if (ret) >>> + goto out_free_wq; >>> + >>> + can_led_event(net, CAN_LED_EVENT_OPEN); >>> + netif_wake_queue(net); >>> + mutex_unlock(&priv->tcan4x5x_lock); >>> + >>> + return 0; >>> + >>> + out_free_wq: >>> + destroy_workqueue(priv->wq); >>> + out_free_irq: >>> + free_irq(priv->irq, priv); >>> + tcan4x5x_sleep(spi); >>> + out_close: >>> + tcan4x5x_power_enable(priv->power, 0); >>> + close_candev(net); >>> + mutex_unlock(&priv->tcan4x5x_lock); >>> + return ret; >>> +} >>> + >>> +static int tcan4x5x_stop(struct net_device *net) >>> +{ >>> + struct tcan4x5x_priv *priv = netdev_priv(net); >>> + struct spi_device *spi = priv->spi; >>> + >>> + close_candev(net); >>> + >>> + priv->force_quit = 1; >>> + free_irq(priv->irq, priv); >>> + destroy_workqueue(priv->wq); >>> + priv->wq = NULL; >>> + >>> + mutex_lock(&priv->tcan4x5x_lock); >>> + >>> + priv->can.state = CAN_STATE_STOPPED; >>> + tcan4x5x_sleep(spi); >>> + tcan4x5x_power_enable(priv->power, 0); >>> + >>> + mutex_unlock(&priv->tcan4x5x_lock); >>> + >>> + can_led_event(net, CAN_LED_EVENT_STOP); >>> + >>> + return 0; >>> +} >>> + >>> +static netdev_tx_t tcan4x5x_hard_start_xmit(struct sk_buff *skb, >>> + struct net_device *net) >>> +{ >>> + struct tcan4x5x_priv *priv = netdev_priv(net); >>> + struct spi_device *spi = priv->spi; >>> + >>> + if (priv->tx_skb || priv->tx_len) { >>> + dev_warn(&spi->dev, "hard_xmit called while tx busy\n"); >>> + return NETDEV_TX_BUSY; >>> + } >>> + >>> + if (can_dropped_invalid_skb(net, skb)) >>> + return NETDEV_TX_OK; >>> + >>> + netif_stop_queue(net); >>> + priv->tx_skb = skb; >>> + queue_work(priv->wq, &priv->tx_work); >>> + >>> + return NETDEV_TX_OK; >>> +} >>> + >>> +static int tcan4x5x_do_set_mode(struct net_device *net, enum can_mode mode) >>> +{ >>> + struct tcan4x5x_priv *priv = netdev_priv(net); >>> + >>> + switch (mode) { >>> + case CAN_MODE_START: >>> + tcan4x5x_clean(net); >>> + priv->can.state = CAN_STATE_ERROR_ACTIVE; >>> + priv->restart_tx = 1; >>> + queue_work(priv->wq, &priv->restart_work); >>> + break; >>> + default: >>> + return -EOPNOTSUPP; >>> + } >>> + >>> + return 0; >>> +} >>> + >>> +static const struct net_device_ops tcan4x5x_netdev_ops = { >>> + .ndo_open = tcan4x5x_open, >>> + .ndo_stop = tcan4x5x_stop, >>> + .ndo_start_xmit = tcan4x5x_hard_start_xmit, >>> + .ndo_change_mtu = can_change_mtu, >>> +}; >>> + >>> +static int tcan4x5x_parse_config(struct tcan4x5x_priv *tcan4x5x) >>> +{ >>> + tcan4x5x->reset_gpio = devm_gpiod_get_optional(&tcan4x5x->spi->dev, >>> + "reset", GPIOD_OUT_LOW); >>> + if (IS_ERR(tcan4x5x->reset_gpio)) >>> + tcan4x5x->reset_gpio = NULL; >>> + >>> + tcan4x5x->wake_gpio = devm_gpiod_get_optional(&tcan4x5x->spi->dev, >>> + "wake-up", GPIOD_OUT_LOW); >>> + if (IS_ERR(tcan4x5x->wake_gpio)) >>> + tcan4x5x->wake_gpio = NULL; >>> + >>> + tcan4x5x->interrupt_gpio = devm_gpiod_get(&tcan4x5x->spi->dev, >>> + "data-ready", GPIOD_IN); >>> + if (IS_ERR(tcan4x5x->interrupt_gpio)) { >>> + dev_err(&tcan4x5x->spi->dev, "data-ready gpio not defined\n"); >>> + return -EINVAL; >>> + } >>> + >>> + tcan4x5x->irq = gpiod_to_irq(tcan4x5x->interrupt_gpio); >>> + >>> + tcan4x5x->power = devm_regulator_get_optional(&tcan4x5x->spi->dev, >>> + "vsup"); >>> + if (PTR_ERR(tcan4x5x->power) == -EPROBE_DEFER) >>> + return -EPROBE_DEFER; >>> + >>> + return 0; >>> +} >>> + >>> +static const struct regmap_config tcan4x5x_regmap = { >>> + .reg_bits = 16, >>> + .val_bits = 32, >>> + .cache_type = REGCACHE_NONE, >>> + .max_register = TCAN4X5X_MAX_REGISTER, >>> +}; >>> + >>> +static int tcan4x5x_can_probe(struct spi_device *spi) >>> +{ >>> + struct net_device *net; >>> + struct tcan4x5x_priv *priv; >>> + struct clk *clk; >>> + int freq, ret; >>> + >>> + clk = devm_clk_get(&spi->dev, NULL); >>> + if (IS_ERR(clk)) { >>> + dev_err(&spi->dev, "no CAN clock source defined\n"); >>> + freq = TCAN4X5X_EXT_CLK_DEF; >>> + } else { >>> + freq = clk_get_rate(clk); >>> + } >>> + >>> + /* Sanity check */ >>> + if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF) >>> + return -ERANGE; >>> + >>> + /* Allocate can/net device */ >>> + net = alloc_candev(sizeof(*priv), TCAN4X5X_TX_ECHO_SKB_MAX); >>> + if (!net) >>> + return -ENOMEM; >>> + >>> + if (!IS_ERR(clk)) { >>> + ret = clk_prepare_enable(clk); >>> + if (ret) >>> + goto out_free; >>> + } >>> + >>> + net->netdev_ops = &tcan4x5x_netdev_ops; >>> + net->flags |= IFF_ECHO; >>> + net->mtu = CANFD_MTU; >>> + >>> + priv = netdev_priv(net); >>> + priv->can.bittiming_const = &tcan4x5x_bittiming_const; >>> + priv->can.data_bittiming_const = &tcan4x5x_data_bittiming_const; >>> + priv->can.do_set_mode = tcan4x5x_do_set_mode; >>> + priv->can.clock.freq = freq; >>> + priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | >>> + CAN_CTRLMODE_LISTENONLY | >>> + CAN_CTRLMODE_BERR_REPORTING | >>> + CAN_CTRLMODE_FD | >>> + CAN_CTRLMODE_FD_NON_ISO; >>> + priv->net = net; >>> + priv->spi = spi; >>> + priv->clk = clk; >>> + spi_set_drvdata(spi, priv); >>> + >>> + ret = tcan4x5x_parse_config(priv); >>> + if (ret) >>> + goto out_clk; >>> + >>> + /* Configure the SPI bus */ >>> + spi->bits_per_word = 32; >>> + ret = spi_setup(spi); >>> + if (ret) >>> + goto out_clk; >>> + >>> + mutex_init(&priv->tcan4x5x_lock); >>> + >>> + priv->regmap = devm_regmap_init(&spi->dev, &tcan4x5x_bus, >>> + &spi->dev, &tcan4x5x_regmap); >>> + >>> + SET_NETDEV_DEV(net, &spi->dev); >>> + ret = register_candev(net); >>> + if (ret) >>> + goto error_probe; >>> + >>> + devm_can_led_init(net); >>> + >>> + netdev_info(net, "TCAN4X5X successfully initialized.\n"); >>> + return 0; >>> + >>> +error_probe: >>> + tcan4x5x_power_enable(priv->power, 0); >>> +out_clk: >>> + if (!IS_ERR(clk)) >>> + clk_disable_unprepare(clk); >>> +out_free: >>> + free_candev(net); >>> + dev_err(&spi->dev, "Probe failed, err=%d\n", -ret); >>> + return ret; >>> +} >>> + >>> +static int tcan4x5x_can_remove(struct spi_device *spi) >>> +{ >>> + struct tcan4x5x_priv *priv = spi_get_drvdata(spi); >>> + struct net_device *net = priv->net; >>> + >>> + unregister_candev(net); >>> + >>> + tcan4x5x_power_enable(priv->power, 0); >>> + >>> + if (!IS_ERR(priv->clk)) >>> + clk_disable_unprepare(priv->clk); >>> + >>> + free_candev(net); >>> + >>> + return 0; >>> +} >>> + >>> +static const struct of_device_id tcan4x5x_of_match[] = { >>> + { .compatible = "ti,tcan4x5x", }, >>> + { } >>> +}; >>> +MODULE_DEVICE_TABLE(of, tcan4x5x_of_match); >>> + >>> +static const struct spi_device_id tcan4x5x_id_table[] = { >>> + { >>> + .name = "tcan4x5x", >>> + .driver_data = 0, >>> + }, >>> + { } >>> +}; >>> +MODULE_DEVICE_TABLE(spi, tcan4x5x_id_table); >>> + >>> +static struct spi_driver tcan4x5x_can_driver = { >>> + .driver = { >>> + .name = DEVICE_NAME, >>> + .of_match_table = tcan4x5x_of_match, >>> + .pm = NULL, >>> + }, >>> + .id_table = tcan4x5x_id_table, >>> + .probe = tcan4x5x_can_probe, >>> + .remove = tcan4x5x_can_remove, >>> +}; >>> +module_spi_driver(tcan4x5x_can_driver); >>> + >>> +MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); >>> +MODULE_DESCRIPTION("Texas Instruments TCAN4x5x CAN driver"); >>> +MODULE_LICENSE("GPL v2"); >>> diff --git a/drivers/net/can/spi/tcan4x5x.h b/drivers/net/can/spi/tcan4x5x.h >>> new file mode 100644 >>> index 000000000000..5e14ba571d49 >>> --- /dev/null >>> +++ b/drivers/net/can/spi/tcan4x5x.h >>> @@ -0,0 +1,109 @@ >>> +// SPDX-License-Identifier: GPL-2.0 >>> +// SPI to CAN driver for the Texas Instruments TCA4x5x >>> +// Flash driver chip family >>> +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ >>> + >>> +#define TCAN4X5X_DEV_ID0 0x00 >>> +#define TCAN4X5X_DEV_ID1 0x04 >>> +#define TCAN4X5X_REV 0x08 >>> +#define TCAN4X5X_STATUS 0x0C >>> +#define TCAN4X5X_ERROR_STATUS 0x10 >>> +#define TCAN4X5X_CONTROL 0x14 >>> + >>> +#define TCAN4X5X_CONFIG 0x800 >>> +#define TCAN4X5X_TS_PRESCALE 0x804 >>> +#define TCAN4X5X_TEST_REG 0x808 >>> +#define TCAN4X5X_INT_FLAGS 0x820 >>> +#define TCAN4X5X_MCAN_INT_REG 0x824 >>> +#define TCAN4X5X_INT_EN 0x830 >>> + >>> +#define TCAN4X5X_MCAN_CREL 0x1000 >>> +#define TCAN4X5X_MCAN_ENDN 0x1004 >>> +#define TCAN4X5X_MCAN_CUST 0x1008 >>> +#define TCAN4X5X_MCAN_DBTP 0x100C >>> +#define TCAN4X5X_MCAN_TEST 0x1010 >>> +#define TCAN4X5X_MCAN_RWD 0x1014 >>> +#define TCAN4X5X_MCAN_CCCR 0x1018 >>> +#define TCAN4X5X_MCAN_NBTP 0x101C >>> +#define TCAN4X5X_MCAN_TSCC 0x1020 >>> +#define TCAN4X5X_MCAN_TSCV 0x1024 >>> +#define TCAN4X5X_MCAN_TOCC 0x1028 >>> +#define TCAN4X5X_MCAN_TOCV 0x102C >>> +#define TCAN4X5X_MCAN_ECR 0x1040 >>> +#define TCAN4X5X_MCAN_PSR 0x1044 >>> +#define TCAN4X5X_MCAN_TDCR 0x1048 >>> +#define TCAN4X5X_MCAN_INT_FLAG 0x1050 >>> +#define TCAN4X5X_MCAN_INT_EN 0x1054 >>> +#define TCAN4X5X_MCAN_ILS 0x1058 >>> +#define TCAN4X5X_MCAN_ILE 0x105C >>> +#define TCAN4X5X_MCAN_GFC 0x1080 >>> +#define TCAN4X5X_MCAN_SIDFC 0x1084 >>> +#define TCAN4X5X_MCAN_XIDFC 0x1088 >>> +#define TCAN4X5X_MCAN_XIDAM 0x1090 >>> +#define TCAN4X5X_MCAN_HPMS 0x1094 >>> +#define TCAN4X5X_MCAN_NDAT1 0x1098 >>> +#define TCAN4X5X_MCAN_NDAT2 0x109C >>> +#define TCAN4X5X_MCAN_RXF0C 0x10A0 >>> +#define TCAN4X5X_MCAN_RXF0S 0x10A4 >>> +#define TCAN4X5X_MCAN_RXF0A 0x10A8 >>> +#define TCAN4X5X_MCAN_RXBC 0x10AC >>> +#define TCAN4X5X_MCAN_RXF1C 0x10B0 >>> +#define TCAN4X5X_MCAN_RXF1S 0x10B4 >>> +#define TCAN4X5X_MCAN_RXF1A 0x10B8 >>> +#define TCAN4X5X_MCAN_RXESC 0x10BC >>> +#define TCAN4X5X_MCAN_TXBC 0x10C0 >>> +#define TCAN4X5X_MCAN_TXFQS 0x10C4 >>> +#define TCAN4X5X_MCAN_TXESC 0x10C8 >>> +#define TCAN4X5X_MCAN_TXBRP 0x10CC >>> +#define TCAN4X5X_MCAN_TXBAR 0x10D0 >>> +#define TCAN4X5X_MCAN_TXBCR 0x10D4 >>> +#define TCAN4X5X_MCAN_TXBTO 0x10D8 >>> +#define TCAN4X5X_MCAN_TXBCF 0x10DC >>> +#define TCAN4X5X_MCAN_TXBTIE 0x10E0 >>> +#define TCAN4X5X_MCAN_TXBCIE 0x10E4 >>> +#define TCAN4X5X_MCAN_TXEFC 0x10F0 >>> +#define TCAN4X5X_MCAN_TXEFS 0x10F4 >>> +#define TCAN4X5X_MCAN_TXEFA 0x10F8 >>> + >>> +#define TCAN4X5X_MRAM_START 0x8000 >>> +#define TCAN4X5X_MRAM_SIZE 2048 >>> + >>> +#define TCAN4X5X_MAX_REGISTER 0x8fff >>> + >>> +/* 64 byte buffer + 8 byte MCAN header */ >>> +#define TCAN4X5X_BUF_LEN 72 >>> + >>> +struct tcan4x5x_priv { >>> + struct can_priv can; >>> + struct net_device *net; >>> + struct regmap *regmap; >>> + struct spi_device *spi; >>> + >>> + struct mutex tcan4x5x_lock; /* SPI device lock */ >>> + >>> + struct gpio_desc *reset_gpio; >>> + struct gpio_desc *interrupt_gpio; >>> + struct gpio_desc *wake_gpio; >>> + struct regulator *power; >>> + struct clk *clk; >>> + >>> + struct sk_buff *tx_skb; >>> + int tx_len; >>> + >>> + struct workqueue_struct *wq; >>> + struct work_struct tx_work; >>> + struct work_struct restart_work; >>> + >>> + u32 *spi_tx_buf; >>> + u32 *spi_rx_buf; >>> + >>> + int force_quit; >>> + int after_suspend; >>> +#define AFTER_SUSPEND_UP 1 >>> +#define AFTER_SUSPEND_DOWN 2 >>> +#define AFTER_SUSPEND_POWER 4 >>> +#define AFTER_SUSPEND_RESTART 8 >>> + int restart_tx; >>> + >>> + int irq; >>> +}; >>> >> >> -- ------------------ Dan Murphy ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel 2018-10-04 20:26 ` Dan Murphy @ 2018-10-05 5:56 ` Wolfgang Grandegger 2018-10-05 11:45 ` Dan Murphy 0 siblings, 1 reply; 10+ messages in thread From: Wolfgang Grandegger @ 2018-10-05 5:56 UTC (permalink / raw) To: Dan Murphy, mkl, davem; +Cc: linux-can, netdev, linux-kernel, Mario.Huettel Hello Dan, Am 04.10.2018 um 22:26 schrieb Dan Murphy: > Wolfgang > > On 09/26/2018 12:54 PM, Wolfgang Grandegger wrote: >> Hello, >> >> I wonder why you do not extend the existing MCAN driver by implementing >> an interface to access the hardware. Would that be feasible? >> > > I have created a m_can_core code base that can be used by other hardware that > have special needs. > > So I have created the m_can_core, m_can and the tcan4x5x drivers. Great, I still think it's a good idea to have just one "m_can" driver. > I can RFC the code to see if this is what is expected. > It is not 100% working but it is close enough for a directional call. That would be nice! Most of the SPI accesses are pure register accesses. A few read/write more bytes at a time (for data, etc.) but that could be handled by appropriate interface functions. One general problem is that SPI accesses are not possible from interrupt context requiring threads or work queues. Also NAPI is usually not used. Other opinions? Wolfgang. PS: I have added Mario to the CC. Maybe he could test a common driver on his M_CAN hardware. ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel 2018-10-05 5:56 ` Wolfgang Grandegger @ 2018-10-05 11:45 ` Dan Murphy 0 siblings, 0 replies; 10+ messages in thread From: Dan Murphy @ 2018-10-05 11:45 UTC (permalink / raw) To: Wolfgang Grandegger, mkl, davem Cc: linux-can, netdev, linux-kernel, Mario.Huettel Wolfgang On 10/05/2018 12:56 AM, Wolfgang Grandegger wrote: > Hello Dan, > > Am 04.10.2018 um 22:26 schrieb Dan Murphy: >> Wolfgang >> >> On 09/26/2018 12:54 PM, Wolfgang Grandegger wrote: >>> Hello, >>> >>> I wonder why you do not extend the existing MCAN driver by implementing >>> an interface to access the hardware. Would that be feasible? >>> >> >> I have created a m_can_core code base that can be used by other hardware that >> have special needs. >> >> So I have created the m_can_core, m_can and the tcan4x5x drivers. > > Great, I still think it's a good idea to have just one "m_can" driver. The m_can and tcan4x5x provide the device level implementations. The m_can_core deals specifically with handling of the m_can IP and protocol. > >> I can RFC the code to see if this is what is expected. >> It is not 100% working but it is close enough for a directional call. > > That would be nice! Most of the SPI accesses are pure register accesses. > A few read/write more bytes at a time (for data, etc.) but that could be > handled by appropriate interface functions. One general problem is that > SPI accesses are not possible from interrupt context requiring threads > or work queues. Also NAPI is usually not used. > > Other opinions? agreed. Is there any issue with moving the request_irq to a threaded_irq? Not sure how that would affect the timing. > > Wolfgang. > > PS: I have added Mario to the CC. Maybe he could test a common driver on > his M_CAN hardware. > I found that our am5/dra76 EVM also uses this IP stack. So I am working with our experts there to test and review the code as well. Dan -- ------------------ Dan Murphy ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 1/2] dt-bindings: can: tcan4x5x: Add DT bindings for TCAN4x5X driver 2018-09-10 20:12 [PATCH 1/2] dt-bindings: can: tcan4x5x: Add DT bindings for TCAN4x5X driver Dan Murphy 2018-09-10 20:12 ` [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel Dan Murphy @ 2018-09-26 17:40 ` Dan Murphy 1 sibling, 0 replies; 10+ messages in thread From: Dan Murphy @ 2018-09-26 17:40 UTC (permalink / raw) To: wg, mkl, davem; +Cc: linux-can, netdev, linux-kernel bump On 09/10/2018 03:12 PM, Dan Murphy wrote: > DT binding documentation for TI TCAN4x5x driver. > > Signed-off-by: Dan Murphy <dmurphy@ti.com> > --- > .../devicetree/bindings/net/can/tcan4x5x.txt | 33 +++++++++++++++++++ > 1 file changed, 33 insertions(+) > create mode 100644 Documentation/devicetree/bindings/net/can/tcan4x5x.txt > > diff --git a/Documentation/devicetree/bindings/net/can/tcan4x5x.txt b/Documentation/devicetree/bindings/net/can/tcan4x5x.txt > new file mode 100644 > index 000000000000..3eea2f2bb8a7 > --- /dev/null > +++ b/Documentation/devicetree/bindings/net/can/tcan4x5x.txt > @@ -0,0 +1,33 @@ > +Texas Instruments TCAN4x5x CAN Controller > +================================================ > + > +This file provides device node information for the TCAN4x5x interface contains. > + > +Required properties: > + - compatible: "ti,tcan4x5x" > + - reg: 0 > + - #address-cells : 1 > + - #size-cells : 0 > + - spi-max-frequency: Maximum frequency of the SPI bus the chip can > + operate at should be less than or equal to 18 MHz. > + - data-ready-gpios: Interrupt GPIO for data and error reporting. > + - wake-up-gpios: Wake up GPIO to wake up the TCAN device > + > +Optional properties: > + - clocks: Processor clock phandles (see clock bindings for details) > + If no clock is defined then the default 40MHz freq is set. > + - reset-gpios: Hardwired output GPIO. If not defined then software > + reset. > + > +Example: > +tcan4x5x: tcan4x5x@0 { > + compatible = "ti,tcan4x5x"; > + reg = <0>; > + #address-cells = <1>; > + #size-cells = <1>; > + clocks = <&tclkin_ck>; > + spi-max-frequency = <10000000>; > + data-ready-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>; > + wake-up-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>; > + reset-gpios = <&gpio1 27 GPIO_ACTIVE_LOW>; > + }; > -- ------------------ Dan Murphy ^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2018-10-05 11:45 UTC | newest] Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-09-10 20:12 [PATCH 1/2] dt-bindings: can: tcan4x5x: Add DT bindings for TCAN4x5X driver Dan Murphy 2018-09-10 20:12 ` [PATCH 2/2] can: tcan4x5x: Add tcan4x5x driver to the kernel Dan Murphy 2018-09-26 17:40 ` Dan Murphy 2018-09-26 17:54 ` Wolfgang Grandegger 2018-09-26 18:00 ` Dan Murphy 2018-09-26 18:34 ` Wolfgang Grandegger 2018-10-04 20:26 ` Dan Murphy 2018-10-05 5:56 ` Wolfgang Grandegger 2018-10-05 11:45 ` Dan Murphy 2018-09-26 17:40 ` [PATCH 1/2] dt-bindings: can: tcan4x5x: Add DT bindings for TCAN4x5X driver Dan Murphy
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