From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 40048C05027 for ; Mon, 20 Feb 2023 06:21:16 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4PKskL4Kynz3cHX for ; Mon, 20 Feb 2023 17:21:14 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=aspeedtech.com (client-ip=211.20.114.71; helo=twspam01.aspeedtech.com; envelope-from=ryan_chen@aspeedtech.com; receiver=) Received: from twspam01.aspeedtech.com (twspam01.aspeedtech.com [211.20.114.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4PKsjb5Y2Lz3c6f; Mon, 20 Feb 2023 17:20:34 +1100 (AEDT) Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 31K64wMV022737; Mon, 20 Feb 2023 14:04:58 +0800 (GMT-8) (envelope-from ryan_chen@aspeedtech.com) Received: from aspeedtech.com (192.168.10.13) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 20 Feb 2023 14:17:51 +0800 From: Ryan Chen To: Ryan Chen , Rob Herring , Krzysztof Kozlowski , Joel Stanley , Andrew Jeffery , Philipp Zabel , , , , Subject: [PATCH v5 2/2] i2c: aspeed: support ast2600 i2cv2 new register mode driver Date: Mon, 20 Feb 2023 14:17:45 +0800 Message-ID: <20230220061745.1973981-3-ryan_chen@aspeedtech.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230220061745.1973981-1-ryan_chen@aspeedtech.com> References: <20230220061745.1973981-1-ryan_chen@aspeedtech.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [192.168.10.13] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 31K64wMV022737 X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: openbmc-bounces+openbmc=archiver.kernel.org@lists.ozlabs.org Sender: "openbmc" Add i2cv2 new register mode driver to support AST2600 i2c new register mode. AST2600 i2c controller have legacy and new register mode. The new register mode have global register support 4 base clock for scl clock selection, and new clock divider mode. The i2c new register mode have separate register set to control i2c master and slave. Signed-off-by: Ryan Chen --- MAINTAINERS | 9 + drivers/i2c/busses/Kconfig | 11 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-ast2600.c | 1703 ++++++++++++++++++++++++++++++ 4 files changed, 1724 insertions(+) create mode 100644 drivers/i2c/busses/i2c-ast2600.c diff --git a/MAINTAINERS b/MAINTAINERS index 749710e22b4d..c9841568cb24 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1924,6 +1924,15 @@ F: Documentation/devicetree/bindings/interrupt-controller/aspeed,ast2400-i2c-ic. F: drivers/i2c/busses/i2c-aspeed.c F: drivers/irqchip/irq-aspeed-i2c-ic.c +ARM/ASPEED I2CV2 DRIVER +M: Ryan Chen +R: Andrew Jeffery +L: linux-i2c@vger.kernel.org +L: openbmc@lists.ozlabs.org (moderated for non-subscribers) +S: Maintained +F: Documentation/devicetree/bindings/i2c/aspeed,i2cv2.yaml +F: drivers/i2c/busses/i2c-ast2600.c + ARM/ASPEED MACHINE SUPPORT M: Joel Stanley R: Andrew Jeffery diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 7284206b278b..f3f7500ce768 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -389,6 +389,17 @@ config I2C_ALTERA This driver can also be built as a module. If so, the module will be called i2c-altera. +config I2C_AST2600 + tristate "Aspeed I2C v2 Controller" + depends on ARCH_ASPEED || COMPILE_TEST + select I2C_SMBUS + help + If you say yes to this option, support will be included for the + Aspeed I2C controller with new register set. + + This driver can also be built as a module. If so, the module + will be called i2c-new-aspeed. + config I2C_ASPEED tristate "Aspeed I2C Controller" depends on ARCH_ASPEED || COMPILE_TEST diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index c5cac15f075c..d0ab4d45781c 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -38,6 +38,7 @@ obj-$(CONFIG_I2C_POWERMAC) += i2c-powermac.o obj-$(CONFIG_I2C_ALTERA) += i2c-altera.o obj-$(CONFIG_I2C_AMD_MP2) += i2c-amd-mp2-pci.o i2c-amd-mp2-plat.o obj-$(CONFIG_I2C_ASPEED) += i2c-aspeed.o +obj-$(CONFIG_I2C_AST2600) += i2c-ast2600.o obj-$(CONFIG_I2C_AT91) += i2c-at91.o i2c-at91-objs := i2c-at91-core.o i2c-at91-master.o ifeq ($(CONFIG_I2C_AT91_SLAVE_EXPERIMENTAL),y) diff --git a/drivers/i2c/busses/i2c-ast2600.c b/drivers/i2c/busses/i2c-ast2600.c new file mode 100644 index 000000000000..b5fe0af57d11 --- /dev/null +++ b/drivers/i2c/busses/i2c-ast2600.c @@ -0,0 +1,1703 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ASPEED AST2600 new register set I2C controller driver + * + * Copyright (C) ASPEED Technology Inc. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * APB clk : 100Mhz + * div : scl : baseclk [APB/((div/2) + 1)] : tBuf [1/bclk * 16] + * I2CG10[31:24] base clk4 for i2c auto recovery timeout counter (0xC6) + * I2CG10[23:16] base clk3 for Standard-mode (100Khz) min tBuf 4.7us + * 0x3c : 100.8Khz : 3.225Mhz : 4.96us + * 0x3d : 99.2Khz : 3.174Mhz : 5.04us + * 0x3e : 97.65Khz : 3.125Mhz : 5.12us + * 0x40 : 97.75Khz : 3.03Mhz : 5.28us + * 0x41 : 99.5Khz : 2.98Mhz : 5.36us (default) + * I2CG10[15:8] base clk2 for Fast-mode (400Khz) min tBuf 1.3us + * 0x12 : 400Khz : 10Mhz : 1.6us + * I2CG10[7:0] base clk1 for Fast-mode Plus (1Mhz) min tBuf 0.5us + * 0x08 : 1Mhz : 20Mhz : 0.8us + */ +#define AST2600_I2CG_ISR 0x00 +#define AST2600_I2CG_SLAVE_ISR 0x04 +#define AST2600_I2CG_OWNER 0x08 +#define AST2600_I2CG_CTRL 0x0C +#define AST2600_I2CG_CLK_DIV_CTRL 0x10 + +#define AST2600_I2CG_SLAVE_PKT_NAK BIT(4) +#define AST2600_I2CG_M_S_SEPARATE_INTR BIT(3) +#define AST2600_I2CG_CTRL_NEW_REG BIT(2) +#define AST2600_I2CG_CTRL_NEW_CLK_DIV BIT(1) + +#define AST2600_GLOBAL_INIT \ + (AST2600_I2CG_CTRL_NEW_REG | \ + AST2600_I2CG_CTRL_NEW_CLK_DIV) +#define I2CCG_DIV_CTRL 0xC6411208 + +/* 0x00 : I2CC Master/Slave Function Control Register */ +#define AST2600_I2CC_FUN_CTRL 0x00 +#define AST2600_I2CC_SLAVE_ADDR_RX_EN BIT(20) +#define AST2600_I2CC_MASTER_RETRY_MASK GENMASK(19, 18) +#define AST2600_I2CC_MASTER_RETRY(x) (((x) & GENMASK(1, 0)) << 18) +#define AST2600_I2CC_BUS_AUTO_RELEASE BIT(17) +#define AST2600_I2CC_M_SDA_LOCK_EN BIT(16) +#define AST2600_I2CC_MULTI_MASTER_DIS BIT(15) +#define AST2600_I2CC_M_SCL_DRIVE_EN BIT(14) +#define AST2600_I2CC_MSB_STS BIT(9) +#define AST2600_I2CC_SDA_DRIVE_1T_EN BIT(8) +#define AST2600_I2CC_M_SDA_DRIVE_1T_EN BIT(7) +#define AST2600_I2CC_M_HIGH_SPEED_EN BIT(6) +/* reserver 5 : 2 */ +#define AST2600_I2CC_SLAVE_EN BIT(1) +#define AST2600_I2CC_MASTER_EN BIT(0) + +/* 0x04 : I2CC Master/Slave Clock and AC Timing Control Register #1 */ +#define AST2600_I2CC_AC_TIMING 0x04 +#define AST2600_I2CC_TTIMEOUT(x) (((x) & GENMASK(4, 0)) << 24) +#define AST2600_I2CC_TCKHIGHMIN(x) (((x) & GENMASK(3, 0)) << 20) +#define AST2600_I2CC_TCKHIGH(x) (((x) & GENMASK(3, 0)) << 16) +#define AST2600_I2CC_TCKLOW(x) (((x) & GENMASK(3, 0)) << 12) +#define AST2600_I2CC_THDDAT(x) (((x) & GENMASK(1, 0)) << 10) +#define AST2600_I2CC_TOUTBASECLK(x) (((x) & GENMASK(1, 0)) << 8) +#define AST2600_I2CC_TBASECLK(x) ((x) & GENMASK(3, 0)) + +/* 0x08 : I2CC Master/Slave Transmit/Receive Byte Buffer Register */ +#define AST2600_I2CC_STS_AND_BUFF 0x08 +#define AST2600_I2CC_TX_DIR_MASK GENMASK(31, 29) +#define AST2600_I2CC_SDA_OE BIT(28) +#define AST2600_I2CC_SDA_O BIT(27) +#define AST2600_I2CC_SCL_OE BIT(26) +#define AST2600_I2CC_SCL_O BIT(25) + +#define AST2600_I2CC_SCL_LINE_STS BIT(18) +#define AST2600_I2CC_SDA_LINE_STS BIT(17) +#define AST2600_I2CC_BUS_BUSY_STS BIT(16) + +#define AST2600_I2CC_GET_RX_BUFF(x) (((x) >> 8) & GENMASK(7, 0)) + +/* 0x0C : I2CC Master/Slave Pool Buffer Control Register */ +#define AST2600_I2CC_BUFF_CTRL 0x0C +#define AST2600_I2CC_GET_RX_BUF_LEN(x) (((x) >> 24) & GENMASK(5, 0)) +#define AST2600_I2CC_SET_RX_BUF_LEN(x) (((((x) - 1) & GENMASK(4, 0)) << 16) | BIT(0)) +#define AST2600_I2CC_SET_TX_BUF_LEN(x) (((((x) - 1) & GENMASK(4, 0)) << 8) | BIT(0)) +#define AST2600_I2CC_GET_TX_BUF_LEN(x) ((((x) >> 8) & GENMASK(4, 0)) + 1) + +/* 0x10 : I2CM Master Interrupt Control Register */ +#define AST2600_I2CM_IER 0x10 +/* 0x14 : I2CM Master Interrupt Status Register : WC */ +#define AST2600_I2CM_ISR 0x14 + +#define AST2600_I2CM_PKT_TIMEOUT BIT(18) +#define AST2600_I2CM_PKT_ERROR BIT(17) +#define AST2600_I2CM_PKT_DONE BIT(16) + +#define AST2600_I2CM_BUS_RECOVER_FAIL BIT(15) +#define AST2600_I2CM_SDA_DL_TO BIT(14) +#define AST2600_I2CM_BUS_RECOVER BIT(13) +#define AST2600_I2CM_SMBUS_ALT BIT(12) + +#define AST2600_I2CM_SCL_LOW_TO BIT(6) +#define AST2600_I2CM_ABNORMAL BIT(5) +#define AST2600_I2CM_NORMAL_STOP BIT(4) +#define AST2600_I2CM_ARBIT_LOSS BIT(3) +#define AST2600_I2CM_RX_DONE BIT(2) +#define AST2600_I2CM_TX_NAK BIT(1) +#define AST2600_I2CM_TX_ACK BIT(0) + +/* 0x18 : I2CM Master Command/Status Register */ +#define AST2600_I2CM_CMD_STS 0x18 +#define AST2600_I2CM_PKT_ADDR(x) (((x) & GENMASK(6, 0)) << 24) +#define AST2600_I2CM_PKT_EN BIT(16) +#define AST2600_I2CM_SDA_OE_OUT_DIR BIT(15) +#define AST2600_I2CM_SDA_O_OUT_DIR BIT(14) +#define AST2600_I2CM_SCL_OE_OUT_DIR BIT(13) +#define AST2600_I2CM_SCL_O_OUT_DIR BIT(12) +#define AST2600_I2CM_RECOVER_CMD_EN BIT(11) + +#define AST2600_I2CM_RX_DMA_EN BIT(9) +#define AST2600_I2CM_TX_DMA_EN BIT(8) +/* Command Bit */ +#define AST2600_I2CM_RX_BUFF_EN BIT(7) +#define AST2600_I2CM_TX_BUFF_EN BIT(6) +#define AST2600_I2CM_STOP_CMD BIT(5) +#define AST2600_I2CM_RX_CMD_LAST BIT(4) +#define AST2600_I2CM_RX_CMD BIT(3) + +#define AST2600_I2CM_TX_CMD BIT(1) +#define AST2600_I2CM_START_CMD BIT(0) + +/* 0x1C : I2CM Master DMA Transfer Length Register */ +#define AST2600_I2CM_DMA_LEN 0x1C +/* Tx Rx support length 1 ~ 4096 */ +#define AST2600_I2CM_SET_RX_DMA_LEN(x) ((((x) & GENMASK(11, 0)) << 16) | BIT(31)) +#define AST2600_I2CM_SET_TX_DMA_LEN(x) (((x) & GENMASK(11, 0)) | BIT(15)) + +/* 0x20 : I2CS Slave Interrupt Control Register */ +#define AST2600_I2CS_IER 0x20 +/* 0x24 : I2CS Slave Interrupt Status Register */ +#define AST2600_I2CS_ISR 0x24 + +#define AST2600_I2CS_ADDR_INDICATE_MASK GENMASK(31, 30) +#define AST2600_I2CS_SLAVE_PENDING BIT(29) + +#define AST2600_I2CS_WAIT_TX_DMA BIT(25) +#define AST2600_I2CS_WAIT_RX_DMA BIT(24) + +#define AST2600_I2CS_ADDR3_NAK BIT(22) +#define AST2600_I2CS_ADDR2_NAK BIT(21) +#define AST2600_I2CS_ADDR1_NAK BIT(20) + +#define AST2600_I2CS_ADDR_MASK GENMASK(19, 18) +#define AST2600_I2CS_PKT_ERROR BIT(17) +#define AST2600_I2CS_PKT_DONE BIT(16) +#define AST2600_I2CS_INACTIVE_TO BIT(15) + +#define AST2600_I2CS_SLAVE_MATCH BIT(7) +#define AST2600_I2CS_ABNOR_STOP BIT(5) +#define AST2600_I2CS_STOP BIT(4) +#define AST2600_I2CS_RX_DONE_NAK BIT(3) +#define AST2600_I2CS_RX_DONE BIT(2) +#define AST2600_I2CS_TX_NAK BIT(1) +#define AST2600_I2CS_TX_ACK BIT(0) + +/* 0x28 : I2CS Slave CMD/Status Register */ +#define AST2600_I2CS_CMD_STS 0x28 +#define AST2600_I2CS_ACTIVE_ALL GENMASK(18, 17) +#define AST2600_I2CS_PKT_MODE_EN BIT(16) +#define AST2600_I2CS_AUTO_NAK_NOADDR BIT(15) +#define AST2600_I2CS_AUTO_NAK_EN BIT(14) + +#define AST2600_I2CS_ALT_EN BIT(10) +#define AST2600_I2CS_RX_DMA_EN BIT(9) +#define AST2600_I2CS_TX_DMA_EN BIT(8) +#define AST2600_I2CS_RX_BUFF_EN BIT(7) +#define AST2600_I2CS_TX_BUFF_EN BIT(6) +#define AST2600_I2CS_RX_CMD_LAST BIT(4) + +#define AST2600_I2CS_TX_CMD BIT(2) + +#define AST2600_I2CS_DMA_LEN 0x2C +#define AST2600_I2CS_SET_RX_DMA_LEN(x) (((((x) - 1) & GENMASK(11, 0)) << 16) | BIT(31)) +#define AST2600_I2CS_RX_DMA_LEN_MASK (GENMASK(11, 0) << 16) + +#define AST2600_I2CS_SET_TX_DMA_LEN(x) ((((x) - 1) & GENMASK(11, 0)) | BIT(15)) +#define AST2600_I2CS_TX_DMA_LEN_MASK GENMASK(11, 0) + +/* I2CM Master DMA Tx Buffer Register */ +#define AST2600_I2CM_TX_DMA 0x30 +/* I2CM Master DMA Rx Buffer Register */ +#define AST2600_I2CM_RX_DMA 0x34 +/* I2CS Slave DMA Tx Buffer Register */ +#define AST2600_I2CS_TX_DMA 0x38 +/* I2CS Slave DMA Rx Buffer Register */ +#define AST2600_I2CS_RX_DMA 0x3C + +#define AST2600_I2CS_ADDR_CTRL 0x40 + +#define AST2600_I2CS_ADDR3_MASK GENMASK(22, 16) +#define AST2600_I2CS_ADDR2_MASK GENMASK(14, 8) +#define AST2600_I2CS_ADDR1_MASK GENMASK(6, 0) + +#define AST2600_I2CM_DMA_LEN_STS 0x48 +#define AST2600_I2CS_DMA_LEN_STS 0x4C + +#define AST2600_I2C_GET_TX_DMA_LEN(x) ((x) & GENMASK(12, 0)) +#define AST2600_I2C_GET_RX_DMA_LEN(x) (((x) >> 16) & GENMASK(12, 0)) + +/* 0x40 : Slave Device Address Register */ +#define AST2600_I2CS_ADDR3_ENABLE BIT(23) +#define AST2600_I2CS_ADDR3(x) ((x) << 16) + +#define AST2600_I2CS_ADDR2_ENABLE BIT(15) +#define AST2600_I2CS_ADDR2(x) ((x) << 8) +#define AST2600_I2CS_ADDR1_ENABLE BIT(7) +#define AST2600_I2CS_ADDR1(x) (x) + +#define I2C_SLAVE_MSG_BUF_SIZE 256 + +#define AST2600_I2C_DMA_SIZE 4096 + +#define MASTER_TRIGGER_LAST_STOP (AST2600_I2CM_RX_CMD_LAST | AST2600_I2CM_STOP_CMD) +#define SLAVE_TRIGGER_CMD (AST2600_I2CS_ACTIVE_ALL | AST2600_I2CS_PKT_MODE_EN) + +/* i2c timeout counter: use base clk4 1Mhz + * 1/(1000/4096) = 4.096ms * 8 = 32.768ms + */ +#define AST_I2C_TIMEOUT_CLK 0x2 +#define AST_I2C_TIMEOUT_COUNT 0x8 + +struct ast2600_i2c_timing_table { + u32 divisor; + u32 timing; +}; + +enum xfer_mode { + BYTE_MODE = 0, + BUFF_MODE, + DMA_MODE, +}; + +struct ast2600_i2c_bus { + struct i2c_adapter adap; + struct device *dev; + void __iomem *reg_base; + struct regmap *gr_regmap; + struct reset_control *rst; + int irq; + enum xfer_mode mode; + struct clk *clk; + u32 apb_clk; + u32 bus_frequency; + int slave_operate; + int timeout_enable; + /* smbus alert */ + int alert_enable; + struct i2c_smbus_alert_setup alert_data; + struct i2c_client *ara; + /* Multi-master */ + bool multi_master; + /* master structure */ + int cmd_err; + struct completion cmd_complete; + struct i2c_msg *msgs; + size_t buf_index; + /* cur xfer msgs index*/ + int msgs_index; + int msgs_count; + u8 *master_safe_buf; + dma_addr_t master_dma_addr; + /*total xfer count */ + int master_xfer_cnt; + /* Buffer mode */ + void __iomem *buf_base; + size_t buf_size; + /* Slave structure */ + int slave_xfer_len; + int slave_xfer_cnt; +#ifdef CONFIG_I2C_SLAVE + unsigned char *slave_dma_buf; + dma_addr_t slave_dma_addr; + struct i2c_client *slave; +#endif +}; + +static u32 ast2600_select_i2c_clock(struct ast2600_i2c_bus *i2c_bus) +{ + unsigned long base_clk1; + unsigned long base_clk2; + unsigned long base_clk3; + unsigned long base_clk4; + int baseclk_idx; + u32 clk_div_reg; + u32 scl_low; + u32 scl_high; + int divisor; + int inc = 0; + u32 data; + + regmap_read(i2c_bus->gr_regmap, AST2600_I2CG_CLK_DIV_CTRL, &clk_div_reg); + base_clk1 = (i2c_bus->apb_clk * 10) / ((((clk_div_reg & 0xff) + 2) * 10) / 2); + base_clk2 = (i2c_bus->apb_clk * 10) / + (((((clk_div_reg >> 8) & 0xff) + 2) * 10) / 2); + base_clk3 = (i2c_bus->apb_clk * 10) / + (((((clk_div_reg >> 16) & 0xff) + 2) * 10) / 2); + base_clk4 = (i2c_bus->apb_clk * 10) / + (((((clk_div_reg >> 24) & 0xff) + 2) * 10) / 2); + + if ((i2c_bus->apb_clk / i2c_bus->bus_frequency) <= 32) { + baseclk_idx = 0; + divisor = DIV_ROUND_UP(i2c_bus->apb_clk, i2c_bus->bus_frequency); + } else if ((base_clk1 / i2c_bus->bus_frequency) <= 32) { + baseclk_idx = 1; + divisor = DIV_ROUND_UP(base_clk1, i2c_bus->bus_frequency); + } else if ((base_clk2 / i2c_bus->bus_frequency) <= 32) { + baseclk_idx = 2; + divisor = DIV_ROUND_UP(base_clk2, i2c_bus->bus_frequency); + } else if ((base_clk3 / i2c_bus->bus_frequency) <= 32) { + baseclk_idx = 3; + divisor = DIV_ROUND_UP(base_clk3, i2c_bus->bus_frequency); + } else { + baseclk_idx = 4; + divisor = DIV_ROUND_UP(base_clk4, i2c_bus->bus_frequency); + inc = 0; + while ((divisor + inc) > 32) { + inc |= divisor & 0x1; + divisor >>= 1; + baseclk_idx++; + } + divisor += inc; + } + divisor = min_t(int, divisor, 32); + baseclk_idx &= 0xf; + scl_low = ((divisor * 9) / 16) - 1; + scl_low = min_t(u32, scl_low, 0xf); + scl_high = (divisor - scl_low - 2) & 0xf; + /* Divisor : Base Clock : tCKHighMin : tCK High : tCK Low */ + data = ((scl_high - 1) << 20) | (scl_high << 16) | (scl_low << 12) | (baseclk_idx); + if (i2c_bus->timeout_enable) { + data |= AST2600_I2CC_TOUTBASECLK(AST_I2C_TIMEOUT_CLK); + data |= AST2600_I2CC_TTIMEOUT(AST_I2C_TIMEOUT_COUNT); + } + + return data; +} + +static u8 ast2600_i2c_recover_bus(struct ast2600_i2c_bus *i2c_bus) +{ + int ret = 0; + u32 ctrl; + u32 state; + int r; + + dev_dbg(i2c_bus->dev, "%d-bus recovery bus [%x]\n", i2c_bus->adap.nr, + readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF)); + + ctrl = readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + + writel(ctrl & ~(AST2600_I2CC_MASTER_EN | AST2600_I2CC_SLAVE_EN), + i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + + writel(readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL) | AST2600_I2CC_MASTER_EN, + i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + + reinit_completion(&i2c_bus->cmd_complete); + i2c_bus->cmd_err = 0; + + //Check 0x14's SDA and SCL status + state = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + if (!(state & AST2600_I2CC_SDA_LINE_STS) && (state & AST2600_I2CC_SCL_LINE_STS)) { + writel(AST2600_I2CM_RECOVER_CMD_EN, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + r = wait_for_completion_timeout(&i2c_bus->cmd_complete, i2c_bus->adap.timeout); + if (r == 0) { + dev_dbg(i2c_bus->dev, "recovery timed out\n"); + ret = -ETIMEDOUT; + } else { + if (i2c_bus->cmd_err) { + dev_dbg(i2c_bus->dev, "recovery error\n"); + ret = -EPROTO; + } + } + } + + dev_dbg(i2c_bus->dev, "Recovery done [%x]\n", + readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF)); + if (readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF) & AST2600_I2CC_BUS_BUSY_STS) { + dev_dbg(i2c_bus->dev, "Can't recovery bus [%x]\n", + readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF)); + } + + writel(ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + return ret; +} + +#ifdef CONFIG_I2C_SLAVE +static void ast2600_i2c_slave_packet_dma_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts) +{ + int slave_rx_len; + u32 cmd = 0; + u8 value; + int i = 0; + + sts &= ~(AST2600_I2CS_SLAVE_PENDING); + /* Handle i2c slave timeout condition */ + if (AST2600_I2CS_INACTIVE_TO & sts) { + cmd = SLAVE_TRIGGER_CMD; + cmd |= AST2600_I2CS_RX_DMA_EN; + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + return; + } + + sts &= ~(AST2600_I2CS_PKT_DONE | AST2600_I2CS_PKT_ERROR); + + switch (sts) { + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA: + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_WAIT_RX_DMA: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + slave_rx_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CS_DMA_LEN_STS)); + for (i = 0; i < slave_rx_len; i++) { + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, + &i2c_bus->slave_dma_buf[i]); + } + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_RX_DMA_EN; + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_STOP: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_RX_DMA_EN; + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE_NAK | + AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_WAIT_RX_DMA | + AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + case AST2600_I2CS_RX_DONE_NAK | AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + case AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA | AST2600_I2CS_STOP: + case AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + case AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA: + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + if (sts & AST2600_I2CS_SLAVE_MATCH) + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + + slave_rx_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CS_DMA_LEN_STS)); + for (i = 0; i < slave_rx_len; i++) { + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, + &i2c_bus->slave_dma_buf[i]); + } + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + if (sts & AST2600_I2CS_STOP) + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_RX_DMA_EN; + break; + + /* it is Mw data Mr coming -> it need send tx */ + case AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_TX_DMA: + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_TX_DMA: + /* it should be repeat start read */ + if (sts & AST2600_I2CS_SLAVE_MATCH) + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + + slave_rx_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CS_DMA_LEN_STS)); + for (i = 0; i < slave_rx_len; i++) { + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, + &i2c_bus->slave_dma_buf[i]); + } + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, + &i2c_bus->slave_dma_buf[0]); + writel(0, i2c_bus->reg_base + AST2600_I2CS_DMA_LEN_STS); + writel(AST2600_I2CS_SET_TX_DMA_LEN(1), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_TX_DMA_EN; + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_WAIT_TX_DMA: + /* First Start read */ + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, + &i2c_bus->slave_dma_buf[0]); + writel(AST2600_I2CS_SET_TX_DMA_LEN(1), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_TX_DMA_EN; + break; + case AST2600_I2CS_WAIT_TX_DMA: + /* it should be next start read */ + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_PROCESSED, + &i2c_bus->slave_dma_buf[0]); + writel(0, i2c_bus->reg_base + AST2600_I2CS_DMA_LEN_STS); + writel(AST2600_I2CS_SET_TX_DMA_LEN(1), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_TX_DMA_EN; + break; + + case AST2600_I2CS_TX_NAK | AST2600_I2CS_STOP: + /* it just tx complete */ + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + writel(0, i2c_bus->reg_base + AST2600_I2CS_DMA_LEN_STS); + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_RX_DMA_EN; + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE: + cmd = 0; + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + break; + case AST2600_I2CS_STOP: + cmd = 0; + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + break; + default: + dev_dbg(i2c_bus->dev, "todo slave isr case %x, sts %x\n", sts, + readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF)); + break; + } + + if (cmd) + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_ISR); + readl(i2c_bus->reg_base + AST2600_I2CS_ISR); + dev_dbg(i2c_bus->dev, "cmd %x\n", cmd); +} + +static void ast2600_i2c_slave_packet_buff_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts) +{ + int slave_rx_len = 0; + u32 cmd = 0; + u8 value; + int i = 0; + + //due to master slave is common buffer, so need force the master stop not issue + if (readl(i2c_bus->reg_base + AST2600_I2CM_CMD_STS) & 0xffff) { + writel(0, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + i2c_bus->cmd_err = -EBUSY; + writel(0, i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + complete(&i2c_bus->cmd_complete); + } + + /* Handle i2c slave timeout condition */ + if (AST2600_I2CS_INACTIVE_TO & sts) { + writel(SLAVE_TRIGGER_CMD, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_ISR); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + i2c_bus->slave_operate = 0; + return; + } + + sts &= ~(AST2600_I2CS_PKT_DONE | AST2600_I2CS_PKT_ERROR); + + if (sts & AST2600_I2CS_SLAVE_MATCH) + i2c_bus->slave_operate = 1; + + switch (sts) { + case AST2600_I2CS_SLAVE_PENDING | AST2600_I2CS_WAIT_RX_DMA | + AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + case AST2600_I2CS_SLAVE_PENDING | + AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + case AST2600_I2CS_SLAVE_PENDING | + AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_STOP: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + fallthrough; + case AST2600_I2CS_SLAVE_PENDING | + AST2600_I2CS_WAIT_RX_DMA | AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE: + case AST2600_I2CS_WAIT_RX_DMA | AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE: + // fix this : with when stop is coming and clr rx len set trigger rx buff size = 0 + case AST2600_I2CS_WAIT_RX_DMA | AST2600_I2CS_SLAVE_MATCH: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + cmd = SLAVE_TRIGGER_CMD; + if (sts & AST2600_I2CS_RX_DONE) { + slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < slave_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + dev_dbg(i2c_bus->dev, "%02x ", value); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + } + } + if (readl(i2c_bus->reg_base + AST2600_I2CS_CMD_STS) & AST2600_I2CS_RX_BUFF_EN) + cmd = 0; + else + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_RX_BUFF_EN; + + writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + break; + case AST2600_I2CS_WAIT_RX_DMA | AST2600_I2CS_RX_DONE: + cmd = SLAVE_TRIGGER_CMD; + slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < slave_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + dev_dbg(i2c_bus->dev, "%02x ", value); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + } + cmd |= AST2600_I2CS_RX_BUFF_EN; + writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + break; + case AST2600_I2CS_SLAVE_PENDING | AST2600_I2CS_WAIT_RX_DMA | + AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + // D | P | S + cmd = SLAVE_TRIGGER_CMD; + slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < slave_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + dev_dbg(i2c_bus->dev, "%02x ", value); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + } + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + cmd |= AST2600_I2CS_RX_BUFF_EN; + writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + break; + + case AST2600_I2CS_SLAVE_PENDING | AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + cmd = SLAVE_TRIGGER_CMD; + slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < slave_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + dev_dbg(i2c_bus->dev, "%02x ", value); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + } + /* workaround for avoid next start with len != 0 */ + writel(BIT(0), i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + break; + + case AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + cmd = SLAVE_TRIGGER_CMD; + slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < slave_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + dev_dbg(i2c_bus->dev, "%02x ", value); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + } + //workaround for avoid next start with len != 0 + writel(BIT(0), i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + break; + case AST2600_I2CS_WAIT_TX_DMA | AST2600_I2CS_SLAVE_MATCH: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, &value); + dev_dbg(i2c_bus->dev, "tx : %02x ", value); + writeb(value, i2c_bus->buf_base); + writel(AST2600_I2CC_SET_TX_BUF_LEN(1), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_TX_BUFF_EN; + break; + case AST2600_I2CS_WAIT_TX_DMA | AST2600_I2CS_RX_DONE: + case AST2600_I2CS_WAIT_TX_DMA: + if (sts & AST2600_I2CS_RX_DONE) { + slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < slave_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + dev_dbg(i2c_bus->dev, "%02x ", value); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + } + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, &value); + } else { + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_PROCESSED, &value); + } + dev_dbg(i2c_bus->dev, "tx : %02x ", value); + writeb(value, i2c_bus->buf_base); + writel(AST2600_I2CC_SET_TX_BUF_LEN(1), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_TX_BUFF_EN; + break; + /* workaround : trigger the cmd twice to fix next state keep 1000000 */ + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_RX_BUFF_EN; + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + break; + + case AST2600_I2CS_TX_NAK | AST2600_I2CS_STOP: + case AST2600_I2CS_STOP: + cmd = SLAVE_TRIGGER_CMD; + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + break; + default: + dev_dbg(i2c_bus->dev, "todo slave isr case %x, sts %x\n", sts, + readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF)); + break; + } + + if (cmd) + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_ISR); + readl(i2c_bus->reg_base + AST2600_I2CS_ISR); + + if ((sts & AST2600_I2CS_STOP) && !(sts & AST2600_I2CS_SLAVE_PENDING)) + i2c_bus->slave_operate = 0; + + dev_dbg(i2c_bus->dev, "slave_rx_len %d, cmd %x\n", slave_rx_len, cmd); +} + +static void ast2600_i2c_slave_byte_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts) +{ + u32 i2c_buff = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + u32 cmd = AST2600_I2CS_ACTIVE_ALL; + u8 byte_data; + u8 value; + + switch (sts) { + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA: + dev_dbg(i2c_bus->dev, "S : Sw|D\n"); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + /* first address match is address */ + byte_data = AST2600_I2CC_GET_RX_BUFF(i2c_buff); + dev_dbg(i2c_bus->dev, "addr [%x]", byte_data); + break; + case AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA: + dev_dbg(i2c_bus->dev, "S : D\n"); + byte_data = AST2600_I2CC_GET_RX_BUFF(i2c_buff); + dev_dbg(i2c_bus->dev, "rx [%x]", byte_data); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &byte_data); + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_TX_DMA: + cmd |= AST2600_I2CS_TX_CMD; + dev_dbg(i2c_bus->dev, "S : Sr|D\n"); + byte_data = AST2600_I2CC_GET_RX_BUFF(i2c_buff); + dev_dbg(i2c_bus->dev, "addr : [%02x]", byte_data); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, &byte_data); + dev_dbg(i2c_bus->dev, "tx: [%02x]\n", byte_data); + writel(byte_data, i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + break; + case AST2600_I2CS_TX_ACK | AST2600_I2CS_WAIT_TX_DMA: + cmd |= AST2600_I2CS_TX_CMD; + dev_dbg(i2c_bus->dev, "S : D\n"); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_PROCESSED, &byte_data); + dev_dbg(i2c_bus->dev, "tx: [%02x]\n", byte_data); + writel(byte_data, i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + break; + case AST2600_I2CS_STOP: + case AST2600_I2CS_STOP | AST2600_I2CS_TX_NAK: + dev_dbg(i2c_bus->dev, "S : P\n"); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + break; + default: + dev_dbg(i2c_bus->dev, "todo no pkt isr %x\n", sts); + break; + } + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + writel(sts, i2c_bus->reg_base + AST2600_I2CS_ISR); + readl(i2c_bus->reg_base + AST2600_I2CS_ISR); +} + +static int ast2600_i2c_slave_irq(struct ast2600_i2c_bus *i2c_bus) +{ + u32 ier = readl(i2c_bus->reg_base + AST2600_I2CS_IER); + u32 isr = readl(i2c_bus->reg_base + AST2600_I2CS_ISR); + + if (!(isr & ier)) + return 0; + + /* Slave interrupt coming after Master package done + * So need handle master first. + */ + if (readl(i2c_bus->reg_base + AST2600_I2CM_ISR) & AST2600_I2CM_PKT_DONE) + return 0; + + dev_dbg(i2c_bus->dev, "isr %x\n", isr); + + isr &= ~(AST2600_I2CS_ADDR_INDICATE_MASK); + + if (AST2600_I2CS_ADDR1_NAK & isr) + isr &= ~AST2600_I2CS_ADDR1_NAK; + + if (AST2600_I2CS_ADDR2_NAK & isr) + isr &= ~AST2600_I2CS_ADDR2_NAK; + + if (AST2600_I2CS_ADDR3_NAK & isr) + isr &= ~AST2600_I2CS_ADDR3_NAK; + + if (AST2600_I2CS_ADDR_MASK & isr) + isr &= ~AST2600_I2CS_ADDR_MASK; + + if (AST2600_I2CS_PKT_DONE & isr) { + if (i2c_bus->mode == DMA_MODE) + ast2600_i2c_slave_packet_dma_irq(i2c_bus, isr); + else + ast2600_i2c_slave_packet_buff_irq(i2c_bus, isr); + } else + ast2600_i2c_slave_byte_irq(i2c_bus, isr); + + return 1; +} +#endif + +static int ast2600_i2c_do_start(struct ast2600_i2c_bus *i2c_bus) +{ + struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index]; + int xfer_len = 0; + int i = 0; + u32 cmd; + + cmd = AST2600_I2CM_PKT_EN | AST2600_I2CM_PKT_ADDR(msg->addr) | AST2600_I2CM_START_CMD; + + /* send start */ + dev_dbg(i2c_bus->dev, "[%d] %sing %d byte%s %s 0x%02x\n", + i2c_bus->msgs_index, msg->flags & I2C_M_RD ? "read" : "write", + msg->len, msg->len > 1 ? "s" : "", + msg->flags & I2C_M_RD ? "from" : "to", msg->addr); + + i2c_bus->master_xfer_cnt = 0; + i2c_bus->buf_index = 0; + + if (msg->flags & I2C_M_RD) { + cmd |= AST2600_I2CM_RX_CMD; + if (i2c_bus->mode == DMA_MODE) { + /* dma mode */ + cmd |= AST2600_I2CM_RX_DMA_EN; + + if (msg->flags & I2C_M_RECV_LEN) { + dev_dbg(i2c_bus->dev, "smbus read\n"); + xfer_len = 1; + } else { + if (msg->len > AST2600_I2C_DMA_SIZE) { + xfer_len = AST2600_I2C_DMA_SIZE; + } else { + xfer_len = msg->len; + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) { + dev_dbg(i2c_bus->dev, "last stop\n"); + cmd |= MASTER_TRIGGER_LAST_STOP; + } + } + } + writel(AST2600_I2CM_SET_RX_DMA_LEN(xfer_len - 1), + i2c_bus->reg_base + AST2600_I2CM_DMA_LEN); + i2c_bus->master_safe_buf = i2c_get_dma_safe_msg_buf(msg, 1); + if (!i2c_bus->master_safe_buf) + return -ENOMEM; + i2c_bus->master_dma_addr = + dma_map_single(i2c_bus->dev, i2c_bus->master_safe_buf, + msg->len, DMA_FROM_DEVICE); + if (dma_mapping_error(i2c_bus->dev, i2c_bus->master_dma_addr)) { + i2c_put_dma_safe_msg_buf(i2c_bus->master_safe_buf, msg, false); + i2c_bus->master_safe_buf = NULL; + return -ENOMEM; + } + writel(i2c_bus->master_dma_addr, i2c_bus->reg_base + AST2600_I2CM_RX_DMA); + } else if (i2c_bus->mode == BUFF_MODE) { + /* buff mode */ + cmd |= AST2600_I2CM_RX_BUFF_EN; + if (msg->flags & I2C_M_RECV_LEN) { + dev_dbg(i2c_bus->dev, "smbus read\n"); + xfer_len = 1; + } else { + if (msg->len > i2c_bus->buf_size) { + xfer_len = i2c_bus->buf_size; + } else { + xfer_len = msg->len; + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) { + dev_dbg(i2c_bus->dev, "last stop\n"); + cmd |= MASTER_TRIGGER_LAST_STOP; + } + } + } + writel(AST2600_I2CC_SET_RX_BUF_LEN(xfer_len), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + } else { + /* byte mode */ + xfer_len = 1; + if (msg->flags & I2C_M_RECV_LEN) { + dev_dbg(i2c_bus->dev, "smbus read\n"); + } else { + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) { + if (msg->len == 1) { + dev_dbg(i2c_bus->dev, "last stop\n"); + cmd |= MASTER_TRIGGER_LAST_STOP; + } + } + } + } + } else { + if (i2c_bus->mode == DMA_MODE) { + /* dma mode */ + if (msg->len > AST2600_I2C_DMA_SIZE) { + xfer_len = AST2600_I2C_DMA_SIZE; + } else { + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) { + dev_dbg(i2c_bus->dev, "with stop\n"); + cmd |= AST2600_I2CM_STOP_CMD; + } + xfer_len = msg->len; + } + + if (xfer_len) { + cmd |= AST2600_I2CM_TX_DMA_EN | AST2600_I2CM_TX_CMD; + writel(AST2600_I2CM_SET_TX_DMA_LEN(xfer_len - 1), + i2c_bus->reg_base + AST2600_I2CM_DMA_LEN); + i2c_bus->master_safe_buf = i2c_get_dma_safe_msg_buf(msg, 1); + if (!i2c_bus->master_safe_buf) + return -ENOMEM; + i2c_bus->master_dma_addr = + dma_map_single(i2c_bus->dev, i2c_bus->master_safe_buf, + msg->len, DMA_TO_DEVICE); + if (dma_mapping_error(i2c_bus->dev, i2c_bus->master_dma_addr)) { + i2c_put_dma_safe_msg_buf(i2c_bus->master_safe_buf, + msg, false); + i2c_bus->master_safe_buf = NULL; + return -ENOMEM; + } + writel(i2c_bus->master_dma_addr, + i2c_bus->reg_base + AST2600_I2CM_TX_DMA); + } + } else if (i2c_bus->mode == BUFF_MODE) { + u8 wbuf[4]; + /* buff mode */ + if (msg->len > i2c_bus->buf_size) { + xfer_len = i2c_bus->buf_size; + } else { + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) { + dev_dbg(i2c_bus->dev, "with stop\n"); + cmd |= AST2600_I2CM_STOP_CMD; + } + xfer_len = msg->len; + } + if (xfer_len) { + cmd |= AST2600_I2CM_TX_BUFF_EN | AST2600_I2CM_TX_CMD; + if (readl(i2c_bus->reg_base + AST2600_I2CS_ISR)) + return -ENOMEM; + writel(AST2600_I2CC_SET_TX_BUF_LEN(xfer_len), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + if (readl(i2c_bus->reg_base + AST2600_I2CS_ISR)) + return -ENOMEM; + for (i = 0; i < xfer_len; i++) { + wbuf[i % 4] = msg->buf[i]; + if (i % 4 == 3) + writel(*(u32 *)wbuf, i2c_bus->buf_base + i - 3); + dev_dbg(i2c_bus->dev, "[%02x]\n", msg->buf[i]); + } + if (--i % 4 != 3) + writel(*(u32 *)wbuf, i2c_bus->buf_base + i - (i % 4)); + } + if (readl(i2c_bus->reg_base + AST2600_I2CS_ISR)) + return -ENOMEM; + } else { + /* byte mode */ + if ((i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) && (msg->len <= 1)) { + dev_dbg(i2c_bus->dev, "with stop\n"); + cmd |= AST2600_I2CM_STOP_CMD; + } + + if (msg->len) { + cmd |= AST2600_I2CM_TX_CMD; + xfer_len = 1; + dev_dbg(i2c_bus->dev, "w [0] : %02x\n", msg->buf[0]); + writel(msg->buf[0], i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + } else { + xfer_len = 0; + } + } + } + dev_dbg(i2c_bus->dev, "len %d , cmd %x\n", xfer_len, cmd); + writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + return 0; +} + +static int ast2600_i2c_is_irq_error(u32 irq_status) +{ + if (irq_status & AST2600_I2CM_ARBIT_LOSS) + return -EAGAIN; + if (irq_status & (AST2600_I2CM_SDA_DL_TO | AST2600_I2CM_SCL_LOW_TO)) + return -EBUSY; + if (irq_status & (AST2600_I2CM_ABNORMAL)) + return -EPROTO; + + return 0; +} + +static void ast2600_i2c_master_package_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts) +{ + struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index]; + u32 cmd = AST2600_I2CM_PKT_EN; + int xfer_len; + int i; + + sts &= ~AST2600_I2CM_PKT_DONE; + writel(AST2600_I2CM_PKT_DONE, i2c_bus->reg_base + AST2600_I2CM_ISR); + switch (sts) { + case AST2600_I2CM_PKT_ERROR: + dev_dbg(i2c_bus->dev, "M : ERROR only\n"); + i2c_bus->cmd_err = -EAGAIN; + complete(&i2c_bus->cmd_complete); + break; + case AST2600_I2CM_PKT_ERROR | AST2600_I2CM_TX_NAK: /* a0 fix for issue */ + fallthrough; + case AST2600_I2CM_PKT_ERROR | AST2600_I2CM_TX_NAK | AST2600_I2CM_NORMAL_STOP: + dev_dbg(i2c_bus->dev, "M : TX NAK | NORMAL STOP\n"); + i2c_bus->cmd_err = -ENXIO; + complete(&i2c_bus->cmd_complete); + break; + case AST2600_I2CM_NORMAL_STOP: + /* write 0 byte only have stop isr */ + dev_dbg(i2c_bus->dev, "M clear isr: AST2600_I2CM_NORMAL_STOP = %x\n", sts); + i2c_bus->msgs_index++; + if (i2c_bus->msgs_index < i2c_bus->msgs_count) { + if (ast2600_i2c_do_start(i2c_bus)) { + i2c_bus->cmd_err = -ENOMEM; + complete(&i2c_bus->cmd_complete); + } + } else { + i2c_bus->cmd_err = i2c_bus->msgs_index; + complete(&i2c_bus->cmd_complete); + } + break; + case AST2600_I2CM_TX_ACK: + //dev_dbg(i2c_bus->dev, "M : AST2600_I2CM_TX_ACK = %x\n", sts); + case AST2600_I2CM_TX_ACK | AST2600_I2CM_NORMAL_STOP: + if (i2c_bus->mode == DMA_MODE) + xfer_len = AST2600_I2C_GET_TX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CM_DMA_LEN_STS)); + else if (i2c_bus->mode == BUFF_MODE) + xfer_len = AST2600_I2CC_GET_TX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + else + xfer_len = 1; + + dev_dbg(i2c_bus->dev, + "M : AST2600_I2CM_TX_ACK | AST2600_I2CM_NORMAL_STOP= %x (%d)\n", + sts, xfer_len); + i2c_bus->master_xfer_cnt += xfer_len; + + if (i2c_bus->master_xfer_cnt == msg->len) { + if (i2c_bus->mode == DMA_MODE) { + dma_unmap_single(i2c_bus->dev, i2c_bus->master_dma_addr, msg->len, + DMA_TO_DEVICE); + i2c_put_dma_safe_msg_buf(i2c_bus->master_safe_buf, msg, true); + i2c_bus->master_safe_buf = NULL; + } + i2c_bus->msgs_index++; + if (i2c_bus->msgs_index == i2c_bus->msgs_count) { + i2c_bus->cmd_err = i2c_bus->msgs_index; + complete(&i2c_bus->cmd_complete); + } else { + if (ast2600_i2c_do_start(i2c_bus)) { + i2c_bus->cmd_err = -ENOMEM; + complete(&i2c_bus->cmd_complete); + } + } + } else { + /* do next tx */ + cmd |= AST2600_I2CM_TX_CMD; + if (i2c_bus->mode == DMA_MODE) { + cmd |= AST2600_I2CM_TX_DMA_EN; + xfer_len = msg->len - i2c_bus->master_xfer_cnt; + if (xfer_len > AST2600_I2C_DMA_SIZE) { + xfer_len = AST2600_I2C_DMA_SIZE; + } else { + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) { + dev_dbg(i2c_bus->dev, "M: STOP\n"); + cmd |= AST2600_I2CM_STOP_CMD; + } + } + writel(AST2600_I2CM_SET_TX_DMA_LEN(xfer_len - 1), + i2c_bus->reg_base + AST2600_I2CM_DMA_LEN); + dev_dbg(i2c_bus->dev, "next tx xfer_len: %d, offset %d\n", + xfer_len, i2c_bus->master_xfer_cnt); + writel(i2c_bus->master_dma_addr + i2c_bus->master_xfer_cnt, + i2c_bus->reg_base + AST2600_I2CM_TX_DMA); + } else if (i2c_bus->mode == BUFF_MODE) { + u8 wbuf[4]; + + cmd |= AST2600_I2CM_TX_BUFF_EN; + xfer_len = msg->len - i2c_bus->master_xfer_cnt; + if (xfer_len > i2c_bus->buf_size) { + xfer_len = i2c_bus->buf_size; + } else { + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) { + dev_dbg(i2c_bus->dev, "M: STOP\n"); + cmd |= AST2600_I2CM_STOP_CMD; + } + } + for (i = 0; i < xfer_len; i++) { + wbuf[i % 4] = msg->buf[i2c_bus->master_xfer_cnt + i]; + if (i % 4 == 3) + writel(*(u32 *)wbuf, i2c_bus->buf_base + i - 3); + dev_dbg(i2c_bus->dev, "[%02x]\n", + msg->buf[i2c_bus->master_xfer_cnt + i]); + } + if (--i % 4 != 3) + writel(*(u32 *)wbuf, i2c_bus->buf_base + i - (i % 4)); + writel(AST2600_I2CC_SET_TX_BUF_LEN(xfer_len), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + } else { + /* byte */ + if ((i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) && + ((i2c_bus->master_xfer_cnt + 1) == msg->len)) { + dev_dbg(i2c_bus->dev, "M: STOP\n"); + cmd |= AST2600_I2CM_STOP_CMD; + } + dev_dbg(i2c_bus->dev, "tx buff[%x]\n", + msg->buf[i2c_bus->master_xfer_cnt]); + writel(msg->buf[i2c_bus->master_xfer_cnt], + i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + } + dev_dbg(i2c_bus->dev, "next tx %d cmd: %x\n", xfer_len, cmd); + writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + } + break; + case AST2600_I2CM_RX_DONE: +#ifdef CONFIG_I2C_SLAVE + /* Workaround for master/slave package mode enable rx done stuck issue + * When master go for first read (RX_DONE), slave mode will also effect + * Then controller will send nack, not operate anymore. + */ + if (readl(i2c_bus->reg_base + AST2600_I2CS_CMD_STS) & AST2600_I2CS_PKT_MODE_EN) { + u32 slave_cmd = readl(i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + + writel(0, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + writel(slave_cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + } + fallthrough; +#endif + case AST2600_I2CM_RX_DONE | AST2600_I2CM_NORMAL_STOP: + /* do next rx */ + if (i2c_bus->mode == DMA_MODE) { + xfer_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CM_DMA_LEN_STS)); + } else if (i2c_bus->mode == BUFF_MODE) { + xfer_len = AST2600_I2CC_GET_RX_BUF_LEN( + readl(i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < xfer_len; i++) + msg->buf[i2c_bus->master_xfer_cnt + i] = + readb(i2c_bus->buf_base + 0x10 + i); + } else { + xfer_len = 1; + msg->buf[i2c_bus->master_xfer_cnt] = + AST2600_I2CC_GET_RX_BUFF(readl(i2c_bus->reg_base + + AST2600_I2CC_STS_AND_BUFF)); + } + + dev_dbg(i2c_bus->dev, + "M : AST2600_I2CM_RX_DONE | AST2600_I2CM_NORMAL_STOP = %x (%d)\n", + sts, xfer_len); + + if (msg->flags & I2C_M_RECV_LEN) { + dev_dbg(i2c_bus->dev, "smbus first len = %x\n", msg->buf[0]); + msg->len = msg->buf[0] + ((msg->flags & I2C_CLIENT_PEC) ? 2 : 1); + msg->flags &= ~I2C_M_RECV_LEN; + } + i2c_bus->master_xfer_cnt += xfer_len; + dev_dbg(i2c_bus->dev, "master_xfer_cnt [%d/%d]\n", i2c_bus->master_xfer_cnt, + msg->len); + + if (i2c_bus->master_xfer_cnt == msg->len) { + if (i2c_bus->mode == DMA_MODE) { + dma_unmap_single(i2c_bus->dev, i2c_bus->master_dma_addr, msg->len, + DMA_FROM_DEVICE); + i2c_put_dma_safe_msg_buf(i2c_bus->master_safe_buf, msg, true); + i2c_bus->master_safe_buf = NULL; + } + + for (i = 0; i < msg->len; i++) + dev_dbg(i2c_bus->dev, "M: r %d:[%x]\n", i, msg->buf[i]); + i2c_bus->msgs_index++; + if (i2c_bus->msgs_index == i2c_bus->msgs_count) { + i2c_bus->cmd_err = i2c_bus->msgs_index; + complete(&i2c_bus->cmd_complete); + } else { + if (ast2600_i2c_do_start(i2c_bus)) { + i2c_bus->cmd_err = -ENOMEM; + complete(&i2c_bus->cmd_complete); + } + } + } else { + /* next rx */ + cmd |= AST2600_I2CM_RX_CMD; + if (i2c_bus->mode == DMA_MODE) { + cmd |= AST2600_I2CM_RX_DMA_EN; + xfer_len = msg->len - i2c_bus->master_xfer_cnt; + if (xfer_len > AST2600_I2C_DMA_SIZE) { + xfer_len = AST2600_I2C_DMA_SIZE; + } else { + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) { + dev_dbg(i2c_bus->dev, "last stop\n"); + cmd |= MASTER_TRIGGER_LAST_STOP; + } + } + dev_dbg(i2c_bus->dev, "M: next rx len [%d/%d] , cmd %x\n", xfer_len, + msg->len, cmd); + writel(AST2600_I2CM_SET_RX_DMA_LEN(xfer_len - 1), + i2c_bus->reg_base + AST2600_I2CM_DMA_LEN); + writel(i2c_bus->master_dma_addr + i2c_bus->master_xfer_cnt, + i2c_bus->reg_base + AST2600_I2CM_RX_DMA); + } else if (i2c_bus->mode == BUFF_MODE) { + cmd |= AST2600_I2CM_RX_BUFF_EN; + xfer_len = msg->len - i2c_bus->master_xfer_cnt; + if (xfer_len > i2c_bus->buf_size) { + xfer_len = i2c_bus->buf_size; + } else { + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) { + dev_dbg(i2c_bus->dev, "last stop\n"); + cmd |= MASTER_TRIGGER_LAST_STOP; + } + } + writel(AST2600_I2CC_SET_RX_BUF_LEN(xfer_len), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + } else { + if ((i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) && + ((i2c_bus->master_xfer_cnt + 1) == msg->len)) { + dev_dbg(i2c_bus->dev, "last stop\n"); + cmd |= MASTER_TRIGGER_LAST_STOP; + } + } + dev_dbg(i2c_bus->dev, "M: next rx len %d, cmd %x\n", xfer_len, cmd); + writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + } + break; + default: + dev_dbg(i2c_bus->dev, "todo care sts %x\n", sts); + break; + } +} + +static int ast2600_i2c_master_irq(struct ast2600_i2c_bus *i2c_bus) +{ + u32 sts = readl(i2c_bus->reg_base + AST2600_I2CM_ISR); + u32 ier = readl(i2c_bus->reg_base + AST2600_I2CM_IER); + u32 ctrl = 0; + + dev_dbg(i2c_bus->dev, "M sts %x\n", sts); + if (!i2c_bus->alert_enable) + sts &= ~AST2600_I2CM_SMBUS_ALT; + + if (AST2600_I2CM_BUS_RECOVER_FAIL & sts) { + dev_dbg(i2c_bus->dev, "M clear isr: AST2600_I2CM_BUS_RECOVER_FAIL= %x\n", sts); + writel(AST2600_I2CM_BUS_RECOVER_FAIL, i2c_bus->reg_base + AST2600_I2CM_ISR); + ctrl = readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + writel(0, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + writel(ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + i2c_bus->cmd_err = -EPROTO; + complete(&i2c_bus->cmd_complete); + return 1; + } + + if (AST2600_I2CM_BUS_RECOVER & sts) { + dev_dbg(i2c_bus->dev, "M clear isr: AST2600_I2CM_BUS_RECOVER= %x\n", sts); + writel(AST2600_I2CM_BUS_RECOVER, i2c_bus->reg_base + AST2600_I2CM_ISR); + i2c_bus->cmd_err = 0; + complete(&i2c_bus->cmd_complete); + return 1; + } + + if (AST2600_I2CM_SMBUS_ALT & sts) { + if (ier & AST2600_I2CM_SMBUS_ALT) { + dev_dbg(i2c_bus->dev, "M clear isr: AST2600_I2CM_SMBUS_ALT= %x\n", sts); + /* Disable ALT INT */ + writel(ier & ~AST2600_I2CM_SMBUS_ALT, i2c_bus->reg_base + AST2600_I2CM_IER); + i2c_handle_smbus_alert(i2c_bus->ara); + writel(AST2600_I2CM_SMBUS_ALT, i2c_bus->reg_base + AST2600_I2CM_ISR); + dev_err(i2c_bus->dev, + "ast2600_master_alert_recv bus id %d, Disable Alt, Please Imple\n", + i2c_bus->adap.nr); + return 1; + } + } + + i2c_bus->cmd_err = ast2600_i2c_is_irq_error(sts); + if (i2c_bus->cmd_err) { + dev_dbg(i2c_bus->dev, "received error interrupt: 0x%02x\n", sts); + writel(AST2600_I2CM_PKT_DONE, i2c_bus->reg_base + AST2600_I2CM_ISR); + complete(&i2c_bus->cmd_complete); + return 1; + } + + if (AST2600_I2CM_PKT_DONE & sts) { + ast2600_i2c_master_package_irq(i2c_bus, sts); + return 1; + } + + return 0; +} + +static irqreturn_t ast2600_i2c_bus_irq(int irq, void *dev_id) +{ + struct ast2600_i2c_bus *i2c_bus = dev_id; + +#ifdef CONFIG_I2C_SLAVE + if (readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL) & AST2600_I2CC_SLAVE_EN) { + if (ast2600_i2c_slave_irq(i2c_bus)) { +// dev_dbg(i2c_bus->dev, "bus-%d.slave handle\n", i2c_bus->adap.nr); + return IRQ_HANDLED; + } + } +#endif + return ast2600_i2c_master_irq(i2c_bus) ? IRQ_HANDLED : IRQ_NONE; +} + +static int ast2600_i2c_master_xfer(struct i2c_adapter *adap, + struct i2c_msg *msgs, int num) +{ + struct ast2600_i2c_bus *i2c_bus = i2c_get_adapdata(adap); + unsigned long timeout; + int ret = 0; + + /* If bus is busy in a single master environment, attempt recovery. */ + if (!i2c_bus->multi_master && + (readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF) & AST2600_I2CC_BUS_BUSY_STS)) { + int ret; + + ret = ast2600_i2c_recover_bus(i2c_bus); + if (ret) + return ret; + } + +#ifdef CONFIG_I2C_SLAVE + if (i2c_bus->mode == BUFF_MODE) { + if (i2c_bus->slave_operate) + return -EBUSY; + /* disable slave isr */ + writel(0, i2c_bus->reg_base + AST2600_I2CS_IER); + if (readl(i2c_bus->reg_base + AST2600_I2CS_ISR) || (i2c_bus->slave_operate)) { + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_IER); + return -EBUSY; + } + } +#endif + + i2c_bus->cmd_err = 0; + i2c_bus->msgs = msgs; + i2c_bus->msgs_index = 0; + i2c_bus->msgs_count = num; + reinit_completion(&i2c_bus->cmd_complete); + ret = ast2600_i2c_do_start(i2c_bus); +#ifdef CONFIG_I2C_SLAVE + /* avoid race condication slave is wait and master wait 1st slave operate */ + if (i2c_bus->mode == BUFF_MODE) + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_IER); +#endif + if (ret) + goto master_out; + timeout = wait_for_completion_timeout(&i2c_bus->cmd_complete, i2c_bus->adap.timeout); + if (timeout == 0) { + u32 isr = readl(i2c_bus->reg_base + AST2600_I2CM_ISR); + u32 i2c_status = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + + dev_dbg(i2c_bus->dev, "timeout isr[%x], sts[%x]\n", isr, i2c_status); + if (isr || (i2c_status & AST2600_I2CC_TX_DIR_MASK)) { + u32 ctrl = readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + + writel(0, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + writel(ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); +#ifdef CONFIG_I2C_SLAVE + if (ctrl & AST2600_I2CC_SLAVE_EN) { + u32 cmd = SLAVE_TRIGGER_CMD; + + if (i2c_bus->mode == DMA_MODE) { + cmd |= AST2600_I2CS_RX_DMA_EN; + writel(i2c_bus->slave_dma_addr, + i2c_bus->reg_base + AST2600_I2CS_RX_DMA); + writel(i2c_bus->slave_dma_addr, + i2c_bus->reg_base + AST2600_I2CS_TX_DMA); + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + } else if (i2c_bus->mode == BUFF_MODE) { + cmd = SLAVE_TRIGGER_CMD; + } else { + cmd &= ~AST2600_I2CS_PKT_MODE_EN; + } + dev_dbg(i2c_bus->dev, "slave trigger [%x]\n", cmd); + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + } +#endif + } + ret = -ETIMEDOUT; + } else { + ret = i2c_bus->cmd_err; + } + + dev_dbg(i2c_bus->dev, "bus%d-m: %d end\n", i2c_bus->adap.nr, i2c_bus->cmd_err); + +master_out: + if (i2c_bus->mode == DMA_MODE) { + kfree(i2c_bus->master_safe_buf); + i2c_bus->master_safe_buf = NULL; + } + + return ret; +} + +static void ast2600_i2c_init(struct ast2600_i2c_bus *i2c_bus) +{ + struct platform_device *pdev = to_platform_device(i2c_bus->dev); + u32 fun_ctrl = AST2600_I2CC_BUS_AUTO_RELEASE | AST2600_I2CC_MASTER_EN; + + /* I2C Reset */ + writel(0, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + + if (of_property_read_bool(pdev->dev.of_node, "multi-master")) + i2c_bus->multi_master = true; + else + fun_ctrl |= AST2600_I2CC_MULTI_MASTER_DIS; + + /* Enable Master Mode */ + writel(fun_ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + /* disable slave address */ + writel(0, i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL); + + /* Set AC Timing */ + writel(ast2600_select_i2c_clock(i2c_bus), i2c_bus->reg_base + AST2600_I2CC_AC_TIMING); + + /* Clear Interrupt */ + writel(0xfffffff, i2c_bus->reg_base + AST2600_I2CM_ISR); + +#ifdef CONFIG_I2C_SLAVE + /* for memory buffer initial */ + if (i2c_bus->mode == DMA_MODE) { + i2c_bus->slave_dma_buf = dma_alloc_coherent(i2c_bus->dev, I2C_SLAVE_MSG_BUF_SIZE, + &i2c_bus->slave_dma_addr, GFP_KERNEL); + if (!i2c_bus->slave_dma_buf) + return; + } + + writel(0xfffffff, i2c_bus->reg_base + AST2600_I2CS_ISR); + + if (i2c_bus->mode == BYTE_MODE) { + writel(0xffff, i2c_bus->reg_base + AST2600_I2CS_IER); + } else { + /* Set interrupt generation of I2C slave controller */ + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_IER); + } +#endif +} + +#ifdef CONFIG_I2C_SLAVE +static int ast2600_i2c_reg_slave(struct i2c_client *client) +{ + struct ast2600_i2c_bus *i2c_bus = i2c_get_adapdata(client->adapter); + u32 cmd = SLAVE_TRIGGER_CMD; + + if (i2c_bus->slave) + return -EINVAL; + + dev_dbg(i2c_bus->dev, "slave addr %x\n", client->addr); + + writel(0, i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL); + writel(AST2600_I2CC_SLAVE_EN | readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL), + i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + + /* trigger rx buffer */ + if (i2c_bus->mode == DMA_MODE) { + cmd |= AST2600_I2CS_RX_DMA_EN; + writel(i2c_bus->slave_dma_addr, i2c_bus->reg_base + AST2600_I2CS_RX_DMA); + writel(i2c_bus->slave_dma_addr, i2c_bus->reg_base + AST2600_I2CS_TX_DMA); + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + } else if (i2c_bus->mode == BUFF_MODE) { + cmd = SLAVE_TRIGGER_CMD; + } else { + cmd &= ~AST2600_I2CS_PKT_MODE_EN; + } + + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + i2c_bus->slave = client; + /* Set slave addr. */ + writel(client->addr | AST2600_I2CS_ADDR1_ENABLE, + i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL); + + return 0; +} + +static int ast2600_i2c_unreg_slave(struct i2c_client *slave) +{ + struct ast2600_i2c_bus *i2c_bus = i2c_get_adapdata(slave->adapter); + + WARN_ON(!i2c_bus->slave); + + /* Turn off slave mode. */ + writel(~AST2600_I2CC_SLAVE_EN & readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL), + i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + writel(readl(i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL) & ~AST2600_I2CS_ADDR1_MASK, + i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL); + + i2c_bus->slave = NULL; + + return 0; +} +#endif + +static u32 ast2600_i2c_functionality(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_SMBUS_BLOCK_DATA; +} + +static const struct i2c_algorithm i2c_ast2600_algorithm = { + .master_xfer = ast2600_i2c_master_xfer, +#if IS_ENABLED(CONFIG_I2C_SLAVE) + .reg_slave = ast2600_i2c_reg_slave, + .unreg_slave = ast2600_i2c_unreg_slave, +#endif + .functionality = ast2600_i2c_functionality, +}; + +static const struct of_device_id ast2600_i2c_bus_of_table[] = { + { + .compatible = "aspeed,ast2600-i2cv2", + }, + {} +}; + +MODULE_DEVICE_TABLE(of, ast2600_i2c_bus_of_table); + +static int ast2600_i2c_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct ast2600_i2c_bus *i2c_bus; + struct resource *res; + u32 global_ctrl; + int ret = 0; + + i2c_bus = devm_kzalloc(&pdev->dev, sizeof(*i2c_bus), GFP_KERNEL); + if (!i2c_bus) + return -ENOMEM; + + i2c_bus->rst = devm_reset_control_get_shared(&pdev->dev, NULL); + if (IS_ERR(i2c_bus->rst)) { + dev_err(&pdev->dev, + "missing or invalid reset controller device tree entry\n"); + goto free_mem; + } + reset_control_deassert(i2c_bus->rst); + + i2c_bus->gr_regmap = syscon_regmap_lookup_by_phandle(np, "aspeed,i2c-global"); + if (IS_ERR(i2c_bus->gr_regmap)) { + dev_err(&pdev->dev, "failed to find ast2600 i2c global regmap\n"); + ret = -ENOMEM; + goto free_mem; + } + + regmap_read(i2c_bus->gr_regmap, AST2600_I2CG_CTRL, &global_ctrl); + if ((global_ctrl & AST2600_GLOBAL_INIT) != AST2600_GLOBAL_INIT) { + regmap_write(i2c_bus->gr_regmap, AST2600_I2CG_CTRL, AST2600_GLOBAL_INIT); + regmap_write(i2c_bus->gr_regmap, AST2600_I2CG_CLK_DIV_CTRL, I2CCG_DIV_CTRL); + } + + i2c_bus->mode = DMA_MODE; + i2c_bus->slave_operate = 0; + + if (of_property_read_bool(pdev->dev.of_node, "byte-mode")) + i2c_bus->mode = BYTE_MODE; + + if (of_property_read_bool(pdev->dev.of_node, "buff-mode")) { + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (res && resource_size(res) >= 2) + i2c_bus->buf_base = devm_ioremap_resource(&pdev->dev, res); + + if (!IS_ERR_OR_NULL(i2c_bus->buf_base)) + i2c_bus->buf_size = resource_size(res)/2; + + i2c_bus->mode = BUFF_MODE; + } + + if (of_property_read_bool(pdev->dev.of_node, "timeout")) + i2c_bus->timeout_enable = 1; + + i2c_bus->dev = &pdev->dev; + init_completion(&i2c_bus->cmd_complete); + + i2c_bus->reg_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(i2c_bus->reg_base)) { + ret = PTR_ERR(i2c_bus->reg_base); + goto free_mem; + } + + i2c_bus->irq = platform_get_irq(pdev, 0); + if (i2c_bus->irq < 0) { + dev_err(&pdev->dev, "no irq specified\n"); + ret = -i2c_bus->irq; + goto unmap; + } + + platform_set_drvdata(pdev, i2c_bus); + + i2c_bus->clk = devm_clk_get(i2c_bus->dev, NULL); + if (IS_ERR(i2c_bus->clk)) { + dev_err(i2c_bus->dev, "no clock defined\n"); + ret = -ENODEV; + goto unmap; + } + i2c_bus->apb_clk = clk_get_rate(i2c_bus->clk); + dev_dbg(i2c_bus->dev, "i2c_bus->apb_clk %d\n", i2c_bus->apb_clk); + + + ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency", &i2c_bus->bus_frequency); + if (ret < 0) { + dev_warn(&pdev->dev, "Could not read bus-frequency property\n"); + i2c_bus->bus_frequency = 100000; + } + + /* Initialize the I2C adapter */ + i2c_bus->adap.owner = THIS_MODULE; + i2c_bus->adap.algo = &i2c_ast2600_algorithm; + i2c_bus->adap.retries = 0; + i2c_bus->adap.dev.parent = i2c_bus->dev; + i2c_bus->adap.dev.of_node = pdev->dev.of_node; + i2c_bus->adap.algo_data = i2c_bus; + strscpy(i2c_bus->adap.name, pdev->name, sizeof(i2c_bus->adap.name)); + i2c_set_adapdata(&i2c_bus->adap, i2c_bus); + + ast2600_i2c_init(i2c_bus); + + ret = devm_request_irq(&pdev->dev, i2c_bus->irq, ast2600_i2c_bus_irq, 0, + dev_name(&pdev->dev), i2c_bus); + if (ret < 0) + goto unmap; + + if (of_property_read_bool(pdev->dev.of_node, "smbus-alert")) { + i2c_bus->alert_enable = 1; + i2c_bus->ara = i2c_new_smbus_alert_device(&i2c_bus->adap, &i2c_bus->alert_data); + if (!i2c_bus->ara) + dev_warn(i2c_bus->dev, "Failed to register ARA client\n"); + + writel(AST2600_I2CM_PKT_DONE | AST2600_I2CM_BUS_RECOVER | AST2600_I2CM_SMBUS_ALT, + i2c_bus->reg_base + AST2600_I2CM_IER); + } else { + i2c_bus->alert_enable = 0; + /* Set interrupt generation of I2C master controller */ + writel(AST2600_I2CM_PKT_DONE | AST2600_I2CM_BUS_RECOVER, + i2c_bus->reg_base + AST2600_I2CM_IER); + } + + ret = i2c_add_adapter(&i2c_bus->adap); + if (ret < 0) + goto free_irq; + + dev_info(i2c_bus->dev, "%s [%d]: adapter [%d khz] mode [%d]\n", + pdev->dev.of_node->name, i2c_bus->adap.nr, i2c_bus->bus_frequency / 1000, + i2c_bus->mode); + + return 0; + +free_irq: + devm_free_irq(&pdev->dev, i2c_bus->irq, i2c_bus); +unmap: + devm_iounmap(&pdev->dev, i2c_bus->reg_base); +free_mem: + devm_kfree(&pdev->dev, i2c_bus); + + return ret; +} + +static int ast2600_i2c_remove(struct platform_device *pdev) +{ + struct ast2600_i2c_bus *i2c_bus = platform_get_drvdata(pdev); + + /* Disable everything. */ + writel(0, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + writel(0, i2c_bus->reg_base + AST2600_I2CM_IER); + + devm_free_irq(&pdev->dev, i2c_bus->irq, i2c_bus); + + i2c_del_adapter(&i2c_bus->adap); + +#ifdef CONFIG_I2C_SLAVE + /* for memory buffer initial */ + if (i2c_bus->mode == DMA_MODE) + dma_free_coherent(i2c_bus->dev, I2C_SLAVE_MSG_BUF_SIZE, + i2c_bus->slave_dma_buf, i2c_bus->slave_dma_addr); +#endif + + return 0; +} + +static struct platform_driver ast2600_i2c_bus_driver = { + .probe = ast2600_i2c_probe, + .remove = ast2600_i2c_remove, + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = ast2600_i2c_bus_of_table, + }, +}; +module_platform_driver(ast2600_i2c_bus_driver); + +MODULE_AUTHOR("Ryan Chen "); +MODULE_DESCRIPTION("ASPEED AST2600 I2C Controller Driver"); +MODULE_LICENSE("GPL"); -- 2.34.1