* [PATCH v5 2/2] mmc: Add mmc driver for Sunplus SP7021
2022-03-29 14:42 [PATCH v5 0/2] Add mmc driver for Sunplus SP7021 SOC Tony Huang
2022-03-29 14:42 ` [PATCH v5 1/2] dt-binding: mmc: Add mmc yaml file for Sunplus SP7021 Tony Huang
@ 2022-03-29 14:42 ` Tony Huang
2022-03-29 15:10 ` Arnd Bergmann
1 sibling, 1 reply; 9+ messages in thread
From: Tony Huang @ 2022-03-29 14:42 UTC (permalink / raw)
To: ulf.hansson, robh+dt, lhjeff911, linux-mmc, devicetree,
linux-kernel, p.zabel
Cc: wells.lu, tony.huang, lh.kuo, Tony Huang
Add mmc driver for Sunplus SP7021
Signed-off-by: Tony Huang <tonyhuang.sunplus@gmail.com>
---
Changes in v5:
- Addressed comments from Krzysztof.
- Remove the relevant sdcard code.
- Submit the emmc code only.
MAINTAINERS | 1 +
drivers/mmc/host/Kconfig | 9 +
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/sunplus-mmc.c | 1212 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 1223 insertions(+)
create mode 100644 drivers/mmc/host/sunplus-mmc.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 42498b2..f73b661 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18247,6 +18247,7 @@ M: Tony Huang <tonyhuang.sunplus@gmail.com>
M: Li-hao Kuo <lhjeff911@gmail.com>
S: Maintained
F: Documentation/devicetree/bindings/mmc/sunplu,mmc.yaml
+F: drivers/mmc/host/sunplus-mmc.c
SUPERH
M: Yoshinori Sato <ysato@users.sourceforge.jp>
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 5af8494..0d34a4b 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -14,6 +14,15 @@ config MMC_DEBUG
added host drivers please don't invent their private macro for
debugging.
+config MMC_SUNPLUS
+ tristate "Sunplus SP7021 MMC Controller"
+ depends on ARCH_SUNPLUS || COMPILE_TEST
+ help
+ If you say yes here, you will get support for eMMC host interface
+ on Sunplus SoCs.
+
+ If unsure, say N
+
config MMC_ARMMMCI
tristate "ARM AMBA Multimedia Card Interface support"
depends on ARM_AMBA
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index ea36d37..72c67d5 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -97,6 +97,7 @@ obj-$(CONFIG_MMC_SDHCI_MICROCHIP_PIC32) += sdhci-pic32.o
obj-$(CONFIG_MMC_SDHCI_BRCMSTB) += sdhci-brcmstb.o
obj-$(CONFIG_MMC_SDHCI_OMAP) += sdhci-omap.o
obj-$(CONFIG_MMC_SDHCI_SPRD) += sdhci-sprd.o
+obj-$(CONFIG_MMC_SUNPLUS) += sunplus-mmc.o
obj-$(CONFIG_MMC_CQHCI) += cqhci.o
cqhci-y += cqhci-core.o
cqhci-$(CONFIG_MMC_CRYPTO) += cqhci-crypto.o
diff --git a/drivers/mmc/host/sunplus-mmc.c b/drivers/mmc/host/sunplus-mmc.c
new file mode 100644
index 0000000..5309ede
--- /dev/null
+++ b/drivers/mmc/host/sunplus-mmc.c
@@ -0,0 +1,1212 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) Sunplus Inc.
+ * Author: Tony Huang <tonyhuang.sunplus@gmail.com>
+ * Author: Li-hao Kuo <lhjeff911@gmail.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/mmc/core.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/slot-gpio.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+
+#define SPMMC_MIN_CLK 400000
+#define SPMMC_MAX_CLK 52000000
+#define SPMMC_MAX_BLK_COUNT 65536
+#define SPMMC_MAX_TUNABLE_DLY 7
+
+#define SPMMC_CARD_MEDIATYPE_SRCDST_REG 0x0000
+#define SPMMC_MEDIA_TYPE GENMASK(2, 0)
+#define SPMMC_DMA_SOURCE GENMASK(6, 4)
+#define SPMMC_DMA_DESTINATION GENMASK(10, 8)
+#define SPMMC_MEDIA_NONE 0
+#define SPMMC_MEDIA_SD 6
+#define SPMMC_MEDIA_MS 7
+
+#define SPMMC_SDRAM_SECTOR_0_SIZE_REG 0x0008
+#define SPMMC_DMA_BASE_ADDR_REG 0x000C
+#define SPMMC_HW_DMA_CTRL_REG 0x0010
+#define SPMMC_HW_DMA_RST BIT(9)
+#define SPMMC_DMAIDLE BIT(10)
+
+#define SPMMC_MAX_DMA_MEMORY_SECTORS 8
+
+#define SPMMC_SDRAM_SECTOR_1_ADDR_REG 0x0018
+
+#define SPMMC_SD_INT_REG 0x0088
+#define SPMMC_SDINT_SDCMPEN BIT(0)
+#define SPMMC_SDINT_SDCMP BIT(1)
+#define SPMMC_SDINT_SDCMPCLR BIT(2)
+#define SPMMC_SDINT_SDIOEN BIT(3)
+#define SPMMC_SDINT_SDIO BIT(4)
+#define SPMMC_SDINT_SDIOCLR BIT(5)
+
+#define SPMMC_SD_PAGE_NUM_REG 0x008C
+
+#define SPMMC_SD_CONFIG0_REG 0x0090
+#define SPMMC_SD_PIO_MODE BIT(0)
+#define SPMMC_SD_DDR_MODE BIT(1)
+#define SPMMC_SD_LEN_MODE BIT(2)
+#define SPMMC_SD_TRANS_MODE GENMASK(5, 4)
+#define SPMMC_SD_AUTO_RESPONSE BIT(6)
+#define SPMMC_SD_CMD_DUMMY BIT(7)
+#define SPMMC_SD_RSP_CHK_EN BIT(8)
+#define SPMMC_SDIO_MODE BIT(9)
+#define SPMMC_SD_MMC_MODE BIT(10)
+#define SPMMC_SD_DATA_WD BIT(11)
+#define SPMMC_RX4_EN BIT(14)
+#define SPMMC_SD_RSP_TYPE BIT(15)
+#define SPMMC_MMC8_EN BIT(18)
+#define SPMMC_CLOCK_DIVISION GENMASK(31, 20)
+
+#define SPMMC_SDIO_CTRL_REG 0x0094
+#define SPMMC_INT_MULTI_TRIG BIT(6)
+
+#define SPMMC_SD_RST_REG 0x0098
+#define SPMMC_SD_CTRL_REG 0x009C
+#define SPMMC_NEW_COMMAND_TRIGGER BIT(0)
+#define SPMMC_DUMMY_CLOCK_TRIGGER BIT(1)
+
+#define SPMMC_SD_STATUS_REG 0x00A0
+#define SPMMC_SDSTATUS_DUMMY_READY BIT(0)
+#define SPMMC_SDSTATUS_RSP_BUF_FULL BIT(1)
+#define SPMMC_SDSTATUS_TX_DATA_BUF_EMPTY BIT(2)
+#define SPMMC_SDSTATUS_RX_DATA_BUF_FULL BIT(3)
+#define SPMMC_SDSTATUS_CMD_PIN_STATUS BIT(4)
+#define SPMMC_SDSTATUS_DAT0_PIN_STATUS BIT(5)
+#define SPMMC_SDSTATUS_RSP_TIMEOUT BIT(6)
+#define SPMMC_SDSTATUS_CARD_CRC_CHECK_TIMEOUT BIT(7)
+#define SPMMC_SDSTATUS_STB_TIMEOUT BIT(8)
+#define SPMMC_SDSTATUS_RSP_CRC7_ERROR BIT(9)
+#define SPMMC_SDSTATUS_CRC_TOKEN_CHECK_ERROR BIT(10)
+#define SPMMC_SDSTATUS_RDATA_CRC16_ERROR BIT(11)
+#define SPMMC_SDSTATUS_SUSPEND_STATE_READY BIT(12)
+#define SPMMC_SDSTATUS_BUSY_CYCLE BIT(13)
+#define SPMMC_SDSTATUS_DAT1_PIN_STATUS BIT(14)
+#define SPMMC_SDSTATUS_SD_SENSE_STATUS BIT(15)
+#define SPMMC_SDSTATUS_BOOT_ACK_TIMEOUT BIT(16)
+#define SPMMC_SDSTATUS_BOOT_DATA_TIMEOUT BIT(17)
+#define SPMMC_SDSTATUS_BOOT_ACK_ERROR BIT(18)
+
+#define SPMMC_SD_STATE_REG 0x00A4
+#define SPMMC_CRCTOKEN_CHECK_RESULT GENMASK(6, 4)
+#define SPMMC_SDSTATE_ERROR BIT(13)
+#define SPMMC_SDSTATE_FINISH BIT(14)
+
+#define SPMMC_SD_HW_STATE_REG 0x00A8
+#define SPMMC_SD_BLOCKSIZE_REG 0x00AC
+
+#define SPMMC_SD_CONFIG1_REG 0x00B0
+#define SPMMC_TX_DUMMY_NUM GENMASK(8, 0)
+#define SPMMC_SD_HIGH_SPEED_EN BIT(31)
+
+#define SPMMC_SD_TIMING_CONFIG0_REG 0x00B4
+#define SPMMC_SD_CLOCK_DELAY GENMASK(2, 0)
+#define SPMMC_SD_WRITE_DATA_DELAY GENMASK(6, 4)
+#define SPMMC_SD_WRITE_COMMAND_DELAY GENMASK(10, 8)
+#define SPMMC_SD_READ_RESPONSE_DELAY GENMASK(14, 12)
+#define SPMMC_SD_READ_DATA_DELAY GENMASK(18, 16)
+#define SPMMC_SD_READ_CRC_DELAY GENMASK(22, 20)
+
+#define SPMMC_SD_PIODATATX_REG 0x00BC
+#define SPMMC_SD_PIODATARX_REG 0x00C0
+#define SPMMC_SD_CMDBUF0_3_REG 0x00C4
+#define SPMMC_SD_CMDBUF4_REG 0x00C8
+#define SPMMC_SD_RSPBUF0_3_REG 0x00CC
+#define SPMMC_SD_RSPBUF4_5_REG 0x00D0
+
+#define SPMMC_MAX_RETRIES (8 * 8)
+
+struct spmmc_tuning_info {
+ int enable_tuning;
+ int need_tuning;
+ int retried; /* how many times has been retried */
+ u32 rd_crc_dly:3;
+ u32 rd_dat_dly:3;
+ u32 rd_rsp_dly:3;
+ u32 wr_cmd_dly:3;
+ u32 wr_dat_dly:3;
+ u32 clk_dly:3;
+};
+
+static const u8 tuning_blk_pattern_4bit[] = {
+ 0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
+ 0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
+ 0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
+ 0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
+ 0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
+ 0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
+ 0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
+ 0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
+};
+
+static const u8 tuning_blk_pattern_8bit[] = {
+ 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
+ 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
+ 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
+ 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
+ 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
+ 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
+ 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
+ 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
+ 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
+ 0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
+ 0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
+ 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
+ 0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
+ 0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
+ 0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
+ 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
+};
+
+enum {
+ SPMMC_DMA_MODE = 0,
+ SPMMC_PIO_MODE = 1,
+};
+
+struct spmmc_host {
+ void __iomem *base;
+ struct clk *clk;
+ struct reset_control *rstc;
+ spinlock_t lock; /* Prevent races with irq handler */
+ struct mutex mrq_lock; /* protect spmmc_set_ios() context and spmmc_request() */
+ /* tasklet used to handle error then finish the request */
+ struct tasklet_struct tsklet_finish_req;
+ struct mmc_host *mmc;
+ struct mmc_request *mrq; /* current mrq */
+ int irq;
+ int use_int; /* should raise irq when done? */
+ int power_state; /* current power state: off/up/on */
+ int ddr_enabled;
+ int signal_voltage;
+ int dmapio_mode;
+ /*
+ * for purpose of reducing context switch, only when transfer data that
+ * length is greater than `dma_int_threshold' should use interrupt
+ */
+ int dma_int_threshold;
+ struct sg_mapping_iter sg_miter; /* for pio mode to access sglist */
+ int dma_use_int; /* should raise irq when dma done */
+ struct spmmc_tuning_info tuning_info;
+};
+
+/*
+ * wait for transaction done, return -1 if error.
+ */
+static inline int spmmc_wait_finish(struct spmmc_host *host)
+{
+ /* Wait for transaction finish */
+ unsigned long timeout = jiffies + msecs_to_jiffies(5000);
+
+ while (!time_after(jiffies, timeout)) {
+ if (readl(host->base + SPMMC_SD_STATE_REG) & SPMMC_SDSTATE_FINISH)
+ return 0;
+ if (readl(host->base + SPMMC_SD_STATE_REG) & SPMMC_SDSTATE_ERROR)
+ return -EIO;
+ }
+
+ return -ETIMEDOUT;
+}
+
+static inline int spmmc_wait_sdstatus(struct spmmc_host *host, unsigned int status_bit)
+{
+ unsigned long timeout = jiffies + msecs_to_jiffies(5000);
+
+ while (!time_after(jiffies, timeout)) {
+ if (readl(host->base + SPMMC_SD_STATUS_REG) & status_bit)
+ return 0;
+ if (readl(host->base + SPMMC_SD_STATE_REG) & SPMMC_SDSTATE_ERROR)
+ return -EIO;
+ }
+
+ return -ETIMEDOUT;
+}
+
+#define spmmc_wait_rspbuf_full(host) spmmc_wait_sdstatus(host, SPMMC_SDSTATUS_RSP_BUF_FULL)
+#define spmmc_wait_rxbuf_full(host) spmmc_wait_sdstatus(host, SPMMC_SDSTATUS_RX_DATA_BUF_FULL)
+#define spmmc_wait_txbuf_empty(host) spmmc_wait_sdstatus(host, SPMMC_SDSTATUS_TX_DATA_BUF_EMPTY)
+
+static void spmmc_get_rsp(struct spmmc_host *host, struct mmc_command *cmd)
+{
+ u32 value0_3, value4_5;
+
+ if (unlikely(!(cmd->flags & MMC_RSP_PRESENT)))
+ return;
+ if (unlikely(cmd->flags & MMC_RSP_136)) {
+ if (spmmc_wait_rspbuf_full(host))
+ return;
+ value0_3 = readl(host->base + SPMMC_SD_RSPBUF0_3_REG);
+ value4_5 = readl(host->base + SPMMC_SD_RSPBUF4_5_REG) & 0xffff;
+ cmd->resp[0] = (value0_3 << 8) | (value4_5 >> 8);
+ cmd->resp[1] = value4_5 << 24;
+ value0_3 = readl(host->base + SPMMC_SD_RSPBUF0_3_REG);
+ value4_5 = readl(host->base + SPMMC_SD_RSPBUF4_5_REG) & 0xffff;
+ cmd->resp[1] |= value0_3 >> 8;
+ cmd->resp[2] = value0_3 << 24;
+ cmd->resp[2] |= value4_5 << 8;
+ value0_3 = readl(host->base + SPMMC_SD_RSPBUF0_3_REG);
+ value4_5 = readl(host->base + SPMMC_SD_RSPBUF4_5_REG) & 0xffff;
+ cmd->resp[2] |= value0_3 >> 24;
+ cmd->resp[3] = value0_3 << 8;
+ cmd->resp[3] |= value4_5 >> 8;
+ } else {
+ if (spmmc_wait_rspbuf_full(host))
+ return;
+ value0_3 = readl(host->base + SPMMC_SD_RSPBUF0_3_REG);
+ value4_5 = readl(host->base + SPMMC_SD_RSPBUF4_5_REG) & 0xffff;
+ cmd->resp[0] = (value0_3 << 8) | (value4_5 >> 8);
+ cmd->resp[1] = value4_5 << 24;
+ }
+}
+
+static void spmmc_set_bus_clk(struct spmmc_host *host, int clk)
+{
+ unsigned int clkdiv;
+ int f_min = host->mmc->f_min;
+ int f_max = host->mmc->f_max;
+ u32 value = readl(host->base + SPMMC_SD_CONFIG0_REG);
+
+ if (clk < f_min)
+ clk = f_min;
+ if (clk > f_max)
+ clk = f_max;
+
+ clkdiv = (clk_get_rate(host->clk) + clk) / clk - 1;
+ if (clkdiv > 0xfff)
+ clkdiv = 0xfff;
+
+ value |= FIELD_PREP(SPMMC_CLOCK_DIVISION, clkdiv);
+ writel(value, host->base + SPMMC_SD_CONFIG0_REG);
+
+ /*
+ * In order to reduce the frequency of context switch,
+ * if it is high speed or upper, we do not use interrupt
+ * when send a command that without data transferring.
+ */
+ if (clk > 25000000)
+ host->use_int = 0;
+ else
+ host->use_int = 1;
+}
+
+static void spmmc_set_bus_timing(struct spmmc_host *host, unsigned int timing)
+{
+ u32 value = readl(host->base + SPMMC_SD_CONFIG1_REG);
+ int clkdiv = FIELD_GET(SPMMC_CLOCK_DIVISION, readl(host->base + SPMMC_SD_CONFIG0_REG));
+ int delay = clkdiv / 2 < 7 ? clkdiv / 2 : 7;
+ int hs_en = 1;
+ char *timing_name;
+
+ host->ddr_enabled = 0;
+ switch (timing) {
+ case MMC_TIMING_LEGACY:
+ hs_en = 0;
+ timing_name = "legacy";
+ break;
+ case MMC_TIMING_MMC_HS:
+ timing_name = "mmc high-speed";
+ break;
+ case MMC_TIMING_SD_HS:
+ timing_name = "sd high-speed";
+ break;
+ case MMC_TIMING_UHS_SDR50:
+ timing_name = "sd uhs SDR50";
+ break;
+ case MMC_TIMING_UHS_SDR104:
+ timing_name = "sd uhs SDR104";
+ break;
+ case MMC_TIMING_UHS_DDR50:
+ host->ddr_enabled = 1;
+ timing_name = "sd uhs DDR50";
+ break;
+ case MMC_TIMING_MMC_DDR52:
+ host->ddr_enabled = 1;
+ timing_name = "mmc DDR52";
+ break;
+ case MMC_TIMING_MMC_HS200:
+ timing_name = "mmc HS200";
+ break;
+ default:
+ timing_name = "invalid";
+ hs_en = 0;
+ break;
+ }
+
+ if (hs_en) {
+ value |= SPMMC_SD_HIGH_SPEED_EN; /* sd_high_speed_en */
+ writel(value, host->base + SPMMC_SD_CONFIG1_REG);
+ value = readl(host->base + SPMMC_SD_TIMING_CONFIG0_REG);
+ value |= FIELD_PREP(SPMMC_SD_WRITE_DATA_DELAY, delay); /* sd_wr_dat_dly_sel */
+ value |= FIELD_PREP(SPMMC_SD_WRITE_COMMAND_DELAY, delay); /* sd_wr_cmd_dly_sel */
+ writel(value, host->base + SPMMC_SD_TIMING_CONFIG0_REG);
+ } else {
+ value &= ~SPMMC_SD_HIGH_SPEED_EN;
+ writel(value, host->base + SPMMC_SD_CONFIG1_REG);
+ }
+ if (host->ddr_enabled) {
+ value = readl(host->base + SPMMC_SD_CONFIG0_REG);
+ value |= SPMMC_SD_DDR_MODE; /* sdddrmode */
+ writel(value, host->base + SPMMC_SD_CONFIG0_REG);
+ } else {
+ value = readl(host->base + SPMMC_SD_CONFIG0_REG);
+ value &= ~SPMMC_SD_DDR_MODE;
+ writel(value, host->base + SPMMC_SD_CONFIG0_REG);
+ }
+}
+
+static void spmmc_set_bus_width(struct spmmc_host *host, int width)
+{
+ u32 value = readl(host->base + SPMMC_SD_CONFIG0_REG);
+
+ switch (width) {
+ case MMC_BUS_WIDTH_8:
+ value &= ~SPMMC_SD_DATA_WD;
+ value |= SPMMC_MMC8_EN;
+ break;
+ case MMC_BUS_WIDTH_4:
+ value |= SPMMC_SD_DATA_WD;
+ value &= ~SPMMC_MMC8_EN;
+ break;
+ default:
+ value &= ~SPMMC_SD_DATA_WD;
+ value &= ~SPMMC_MMC8_EN;
+ break;
+ };
+ writel(value, host->base + SPMMC_SD_CONFIG0_REG);
+}
+
+/*
+ * select the working mode of controller: sd/sdio/emmc
+ */
+static void spmmc_select_mode(struct spmmc_host *host)
+{
+ u32 value = readl(host->base + SPMMC_SD_CONFIG0_REG);
+
+ value |= SPMMC_SD_MMC_MODE;
+ value &= ~SPMMC_SDIO_MODE;
+ writel(value, host->base + SPMMC_SD_CONFIG0_REG);
+}
+
+static void spmmc_sw_reset(struct spmmc_host *host)
+{
+ u32 value;
+
+ /*
+ * Must reset dma operation first, or it will
+ * be stuck on sd_state == 0x1c00 because of
+ * a controller software reset bug
+ */
+ value = readl(host->base + SPMMC_HW_DMA_CTRL_REG);
+ value |= SPMMC_DMAIDLE;
+ writel(value, host->base + SPMMC_HW_DMA_CTRL_REG);
+ value &= ~SPMMC_DMAIDLE;
+ writel(value, host->base + SPMMC_HW_DMA_CTRL_REG);
+ value = readl(host->base + SPMMC_HW_DMA_CTRL_REG);
+ value |= SPMMC_HW_DMA_RST;
+ writel(value, host->base + SPMMC_HW_DMA_CTRL_REG);
+ writel(0x7, host->base + SPMMC_SD_RST_REG);
+ while (readl(host->base + SPMMC_SD_HW_STATE_REG) & BIT(6))
+ ;
+}
+
+static void spmmc_prepare_cmd(struct spmmc_host *host, struct mmc_command *cmd)
+{
+ u32 value;
+
+ /* add start bit, according to spec, command format */
+ value = ((cmd->opcode | 0x40) << 24) | (cmd->arg >> 8);
+ writel(value, host->base + SPMMC_SD_CMDBUF0_3_REG);
+ writeb(cmd->arg & 0xff, host->base + SPMMC_SD_CMDBUF4_REG);
+
+ /* disable interrupt if needed */
+ value = readl(host->base + SPMMC_SD_INT_REG);
+ value |= SPMMC_SDINT_SDCMPCLR; /* sd_cmp_clr */
+ if (likely(!host->use_int || cmd->flags & MMC_RSP_136))
+ value &= ~SPMMC_SDINT_SDCMPEN; /* sdcmpen */
+ else
+ value |= SPMMC_SDINT_SDCMPEN;
+
+ writel(value, host->base + SPMMC_SD_INT_REG);
+
+ value = readl(host->base + SPMMC_SD_CONFIG0_REG);
+ value &= ~SPMMC_SD_TRANS_MODE; /* sd_trans_mode */
+ value |= SPMMC_SD_CMD_DUMMY; /* sdcmddummy */
+ if (likely(cmd->flags & MMC_RSP_PRESENT)) {
+ value |= SPMMC_SD_AUTO_RESPONSE; /* sdautorsp */
+ } else {
+ value &= ~SPMMC_SD_AUTO_RESPONSE;
+ writel(value, host->base + SPMMC_SD_CONFIG0_REG);
+
+ return;
+ }
+ /*
+ * Currently, host is not capable of checking R2's CRC7,
+ * thus, enable crc7 check only for 48 bit response commands
+ */
+ if (likely(cmd->flags & MMC_RSP_CRC && !(cmd->flags & MMC_RSP_136)))
+ value |= SPMMC_SD_RSP_CHK_EN; /* sdrspchk_en */
+ else
+ value &= ~SPMMC_SD_RSP_CHK_EN;
+
+ if (unlikely(cmd->flags & MMC_RSP_136))
+ value |= SPMMC_SD_RSP_TYPE; /* sdrsptype */
+ else
+ value &= ~SPMMC_SD_RSP_TYPE;
+ writel(value, host->base + SPMMC_SD_CONFIG0_REG);
+}
+
+static void spmmc_prepare_data(struct spmmc_host *host, struct mmc_data *data)
+{
+ u32 value, srcdst;
+
+ writel(data->blocks - 1, host->base + SPMMC_SD_PAGE_NUM_REG);
+ writel(data->blksz - 1, host->base + SPMMC_SD_BLOCKSIZE_REG);
+ value = readl(host->base + SPMMC_SD_CONFIG0_REG);
+ if (data->flags & MMC_DATA_READ) {
+ value |= FIELD_PREP(SPMMC_SD_TRANS_MODE, 2); /* sd_trans_mode */
+ value &= ~SPMMC_SD_AUTO_RESPONSE; /* sdautorsp */
+ value &= ~SPMMC_SD_CMD_DUMMY; /* sdcmddummy */
+ srcdst = readl(host->base + SPMMC_CARD_MEDIATYPE_SRCDST_REG);
+ srcdst |= FIELD_PREP(SPMMC_DMA_SOURCE, 0x2);
+ srcdst |= FIELD_PREP(SPMMC_DMA_DESTINATION, 0x1);
+ writel(srcdst, host->base + SPMMC_CARD_MEDIATYPE_SRCDST_REG);
+ } else {
+ value |= FIELD_PREP(SPMMC_SD_TRANS_MODE, 1);
+ srcdst = readl(host->base + SPMMC_CARD_MEDIATYPE_SRCDST_REG);
+ srcdst |= FIELD_PREP(SPMMC_DMA_SOURCE, 0x1);
+ srcdst |= FIELD_PREP(SPMMC_DMA_DESTINATION, 0x2);
+ writel(srcdst, host->base + SPMMC_CARD_MEDIATYPE_SRCDST_REG);
+ }
+
+ value |= SPMMC_SD_LEN_MODE;
+ if (likely(host->dmapio_mode == SPMMC_DMA_MODE)) {
+ struct scatterlist *sg;
+ dma_addr_t dma_addr;
+ unsigned int dma_size;
+ u32 *reg_addr;
+ int dma_direction = data->flags & MMC_DATA_READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+ int i, count = 1;
+
+ count = dma_map_sg(host->mmc->parent, data->sg, data->sg_len, dma_direction);
+ if (unlikely(!count || count > SPMMC_MAX_DMA_MEMORY_SECTORS)) {
+ data->error = -EINVAL;
+
+ return;
+ }
+ for_each_sg(data->sg, sg, count, i) {
+ dma_addr = sg_dma_address(sg);
+ dma_size = sg_dma_len(sg) / data->blksz - 1;
+ if (i == 0) {
+ writel(dma_addr, host->base + SPMMC_DMA_BASE_ADDR_REG);
+ writel(dma_size, host->base + SPMMC_SDRAM_SECTOR_0_SIZE_REG);
+ } else {
+ reg_addr = host->base + SPMMC_SDRAM_SECTOR_1_ADDR_REG + (i - 1) * 2;
+ writel(dma_addr, reg_addr);
+ writel(dma_size, reg_addr + 1);
+ }
+ }
+ value &= ~SPMMC_SD_PIO_MODE; /* sdpiomode */
+ writel(value, host->base + SPMMC_SD_CONFIG0_REG);
+ /* enable interrupt if needed */
+ if (!host->use_int && data->blksz * data->blocks > host->dma_int_threshold) {
+ host->dma_use_int = 1;
+ value = readl(host->base + SPMMC_SD_INT_REG);
+ value |= SPMMC_SDINT_SDCMPEN; /* sdcmpen */
+ writel(value, host->base + SPMMC_SD_INT_REG);
+ }
+ } else {
+ value |= SPMMC_SD_PIO_MODE;
+ value |= SPMMC_RX4_EN; /* rx4_en */
+ writel(value, host->base + SPMMC_SD_CONFIG0_REG);
+ }
+}
+
+static inline void spmmc_trigger_transaction(struct spmmc_host *host)
+{
+ u32 value = readl(host->base + SPMMC_SD_CTRL_REG);
+
+ value |= SPMMC_NEW_COMMAND_TRIGGER; /* trigger transaction */
+ writel(value, host->base + SPMMC_SD_CTRL_REG);
+}
+
+static void spmmc_send_stop_cmd(struct spmmc_host *host)
+{
+ struct mmc_command stop = {};
+ u32 value;
+
+ stop.opcode = MMC_STOP_TRANSMISSION;
+ stop.arg = 0;
+ stop.flags = MMC_RSP_R1B;
+ spmmc_prepare_cmd(host, &stop);
+ value = readl(host->base + SPMMC_SD_INT_REG);
+ value &= ~SPMMC_SDINT_SDCMPEN;
+ value |= FIELD_PREP(SPMMC_SDINT_SDCMPEN, 0); /* sdcmpen */
+ writel(value, host->base + SPMMC_SD_INT_REG);
+ spmmc_trigger_transaction(host);
+ spmmc_wait_finish(host);
+}
+
+/*
+ * check if error occurred during transaction.
+ * @host - host
+ * @mrq - the mrq
+ * @return 0 if no error otherwise the error number.
+ */
+static int spmmc_check_error(struct spmmc_host *host, struct mmc_request *mrq)
+{
+ int ret = 0;
+ struct mmc_command *cmd = mrq->cmd;
+ struct mmc_data *data = mrq->data;
+
+ u32 value = readl(host->base + SPMMC_SD_STATE_REG);
+ u32 crc_token = FIELD_GET(SPMMC_CRCTOKEN_CHECK_RESULT, value);
+
+ if (unlikely(value & SPMMC_SDSTATE_ERROR)) {
+ u32 timing_cfg0 = 0;
+
+ value = readl(host->base + SPMMC_SD_STATUS_REG);
+
+ if (host->tuning_info.enable_tuning) {
+ timing_cfg0 = readl(host->base + SPMMC_SD_TIMING_CONFIG0_REG);
+ host->tuning_info.rd_crc_dly = FIELD_GET(SPMMC_SD_READ_CRC_DELAY,
+ timing_cfg0);
+ host->tuning_info.rd_dat_dly = FIELD_GET(SPMMC_SD_READ_DATA_DELAY,
+ timing_cfg0);
+ host->tuning_info.rd_rsp_dly = FIELD_GET(SPMMC_SD_READ_RESPONSE_DELAY,
+ timing_cfg0);
+ host->tuning_info.wr_cmd_dly = FIELD_GET(SPMMC_SD_WRITE_COMMAND_DELAY,
+ timing_cfg0);
+ host->tuning_info.wr_dat_dly = FIELD_GET(SPMMC_SD_WRITE_DATA_DELAY,
+ timing_cfg0);
+ }
+
+ if (value & SPMMC_SDSTATUS_RSP_TIMEOUT) {
+ ret = -ETIMEDOUT;
+ host->tuning_info.wr_cmd_dly++;
+ } else if (value & SPMMC_SDSTATUS_RSP_CRC7_ERROR) {
+ ret = -EILSEQ;
+ host->tuning_info.rd_rsp_dly++;
+ } else if (data) {
+ if ((value & SPMMC_SDSTATUS_STB_TIMEOUT)) {
+ ret = -ETIMEDOUT;
+ host->tuning_info.rd_dat_dly++;
+ } else if (value & SPMMC_SDSTATUS_RDATA_CRC16_ERROR) {
+ ret = -EILSEQ;
+ host->tuning_info.rd_dat_dly++;
+ } else if (value & SPMMC_SDSTATUS_CARD_CRC_CHECK_TIMEOUT) {
+ ret = -ETIMEDOUT;
+ host->tuning_info.rd_crc_dly++;
+ } else if (value & SPMMC_SDSTATUS_CRC_TOKEN_CHECK_ERROR) {
+ ret = -EILSEQ;
+ if (crc_token == 0x5)
+ host->tuning_info.wr_dat_dly++;
+ else
+ host->tuning_info.rd_crc_dly++;
+ }
+ }
+ cmd->error = ret;
+ if (data) {
+ data->error = ret;
+ data->bytes_xfered = 0;
+ }
+ if (!host->tuning_info.need_tuning && host->tuning_info.enable_tuning)
+ cmd->retries = SPMMC_MAX_RETRIES; /* retry it */
+ spmmc_sw_reset(host);
+ usleep_range(5000, 5250);
+
+ if (host->tuning_info.enable_tuning) {
+ timing_cfg0 |= FIELD_PREP(SPMMC_SD_READ_CRC_DELAY,
+ host->tuning_info.rd_crc_dly);
+ timing_cfg0 |= FIELD_PREP(SPMMC_SD_READ_DATA_DELAY,
+ host->tuning_info.rd_dat_dly);
+ timing_cfg0 |= FIELD_PREP(SPMMC_SD_READ_RESPONSE_DELAY,
+ host->tuning_info.rd_rsp_dly);
+ timing_cfg0 |= FIELD_PREP(SPMMC_SD_WRITE_COMMAND_DELAY,
+ host->tuning_info.wr_cmd_dly);
+ timing_cfg0 |= FIELD_PREP(SPMMC_SD_WRITE_DATA_DELAY,
+ host->tuning_info.wr_dat_dly);
+ writel(timing_cfg0, host->base + SPMMC_SD_TIMING_CONFIG0_REG);
+ }
+ } else if (data) {
+ data->error = 0;
+ data->bytes_xfered = data->blocks * data->blksz;
+ }
+ host->tuning_info.need_tuning = ret;
+ /* controller will not send cmd 12 automatically if error occurred */
+ if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
+ cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) {
+ spmmc_send_stop_cmd(host);
+ spmmc_sw_reset(host);
+ }
+
+ return ret;
+}
+
+/*
+ * the strategy is:
+ * 1. if several continuous delays are acceptable, we choose a middle one;
+ * 2. otherwise, we choose the first one.
+ */
+static inline int __find_best_delay(u8 candidate_dly)
+{
+ int f, w, value;
+
+ if (!candidate_dly)
+ return 0;
+ f = ffs(candidate_dly) - 1;
+ w = hweight8(candidate_dly);
+ value = ((1 << w) - 1) << f;
+ if (0xff == (value & ~candidate_dly))
+ return (f + w / 2);
+ else
+ return (f);
+}
+
+static inline __maybe_unused void spmmc_txdummy(struct spmmc_host *host, int count)
+{
+ u32 value;
+
+ count &= 0x1ff;
+ value = readl(host->base + SPMMC_SD_CONFIG1_REG);
+ value |= FIELD_PREP(SPMMC_TX_DUMMY_NUM, count);
+ writel(value, host->base + SPMMC_SD_CONFIG1_REG);
+ value = readl(host->base + SPMMC_SD_CTRL_REG);
+ value |= SPMMC_DUMMY_CLOCK_TRIGGER; /* trigger tx dummy */
+ writel(value, host->base + SPMMC_SD_CTRL_REG);
+}
+
+static void spmmc_xfer_data_pio(struct spmmc_host *host, struct mmc_data *data)
+{
+ u32 *buf; /* tx/rx 4 bytes one time in pio mode */
+ int data_left = data->blocks * data->blksz;
+ int consumed, remain;
+
+ struct sg_mapping_iter *sg_miter = &host->sg_miter;
+ unsigned int flags = 0;
+
+ if (data->flags & MMC_DATA_WRITE)
+ flags |= SG_MITER_FROM_SG;
+ else
+ flags |= SG_MITER_TO_SG;
+ sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
+ while (data_left > 0) {
+ consumed = 0;
+ if (!sg_miter_next(sg_miter))
+ break;
+ buf = sg_miter->addr;
+ remain = sg_miter->length;
+ do {
+ if (data->flags & MMC_DATA_WRITE) {
+ if (spmmc_wait_txbuf_empty(host))
+ goto done;
+ writel(*buf, host->base + SPMMC_SD_PIODATATX_REG);
+ } else {
+ if (spmmc_wait_rxbuf_full(host))
+ goto done;
+ *buf = readl(host->base + SPMMC_SD_PIODATARX_REG);
+ }
+ buf++;
+ consumed += 4;
+ remain -= 4;
+ } while (remain);
+ sg_miter->consumed = consumed;
+ data_left -= consumed;
+ }
+done:
+ sg_miter_stop(sg_miter);
+}
+
+static void spmmc_controller_init(struct spmmc_host *host)
+{
+ u32 value;
+ int ret = reset_control_assert(host->rstc);
+
+ if (!ret) {
+ usleep_range(1000, 1250);
+ ret = reset_control_deassert(host->rstc);
+ }
+
+ value = readl(host->base + SPMMC_CARD_MEDIATYPE_SRCDST_REG);
+ value |= FIELD_PREP(SPMMC_MEDIA_TYPE, SPMMC_MEDIA_SD);
+ writel(value, host->base + SPMMC_CARD_MEDIATYPE_SRCDST_REG);
+ host->signal_voltage = MMC_SIGNAL_VOLTAGE_330;
+}
+
+static void spmmc_set_power_mode(struct spmmc_host *host, struct mmc_ios *ios)
+{
+ if (host->power_state == ios->power_mode)
+ return;
+
+ switch (ios->power_mode) {
+ /* power off->up->on */
+ case MMC_POWER_ON:
+ spmmc_controller_init(host);
+ pm_runtime_get_sync(host->mmc->parent);
+ break;
+ case MMC_POWER_UP:
+ break;
+ case MMC_POWER_OFF:
+ pm_runtime_put(host->mmc->parent);
+ break;
+ }
+ host->power_state = ios->power_mode;
+}
+
+/*
+ * 1. unmap scatterlist if needed;
+ * 2. get response & check error conditions;
+ * 3. unlock host->mrq_lock
+ * 4. notify mmc layer the request is done
+ */
+static void spmmc_finish_request(struct spmmc_host *host, struct mmc_request *mrq)
+{
+ struct mmc_command *cmd;
+ struct mmc_data *data;
+
+ if (!mrq)
+ return;
+
+ cmd = mrq->cmd;
+ data = mrq->data;
+
+ if (data && SPMMC_DMA_MODE == host->dmapio_mode) {
+ int dma_direction = data->flags & MMC_DATA_READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+
+ dma_unmap_sg(host->mmc->parent, data->sg, data->sg_len, dma_direction);
+ host->dma_use_int = 0;
+ }
+ spmmc_get_rsp(host, cmd);
+ spmmc_check_error(host, mrq);
+ host->mrq = NULL;
+ mutex_unlock(&host->mrq_lock);
+ mmc_request_done(host->mmc, mrq);
+}
+
+/* Interrupt Service Routine */
+irqreturn_t spmmc_irq(int irq, void *dev_id)
+{
+ struct spmmc_host *host = dev_id;
+ u32 value = readl(host->base + SPMMC_SD_INT_REG);
+
+ spin_lock(&host->lock);
+ if ((value & SPMMC_SDINT_SDCMP) && (value & SPMMC_SDINT_SDCMPEN)) {
+ value &= ~SPMMC_SDINT_SDCMPEN; /* disable sdcmp */
+ value |= SPMMC_SDINT_SDCMPCLR; /* sd_cmp_clr */
+ writel(value, host->base + SPMMC_SD_INT_REG);
+ /*
+ * if error occurred, we my need send cmd 12 to stop data transaction,
+ * which is time consuming, so make use of tasklet to handle this.
+ */
+ if (unlikely(readl(host->base + SPMMC_SD_STATE_REG) & SPMMC_SDSTATE_ERROR))
+ tasklet_schedule(&host->tsklet_finish_req);
+ else
+ spmmc_finish_request(host, host->mrq);
+ }
+ if (value & SPMMC_SDINT_SDIO &&
+ (value & SPMMC_SDINT_SDIOEN)) {
+ mmc_signal_sdio_irq(host->mmc);
+ }
+ spin_unlock(&host->lock);
+
+ return IRQ_HANDLED;
+}
+
+static void spmmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct spmmc_host *host = mmc_priv(mmc);
+ struct mmc_data *data;
+ struct mmc_command *cmd;
+ int ret;
+
+ ret = mutex_lock_interruptible(&host->mrq_lock);
+ if (ret)
+ return;
+
+ host->mrq = mrq;
+ data = mrq->data;
+ cmd = mrq->cmd;
+
+ spmmc_prepare_cmd(host, cmd);
+ /* we need manually read response R2. */
+ if (unlikely(cmd->flags & MMC_RSP_136)) {
+ spmmc_trigger_transaction(host);
+ spmmc_get_rsp(host, cmd);
+ spmmc_wait_finish(host);
+ spmmc_check_error(host, mrq);
+ host->mrq = NULL;
+ mutex_unlock(&host->mrq_lock);
+ mmc_request_done(host->mmc, mrq);
+ } else {
+ if (data)
+ spmmc_prepare_data(host, data);
+
+ if (unlikely(host->dmapio_mode == SPMMC_PIO_MODE && data)) {
+ u32 value;
+ /* pio data transfer do not use interrupt */
+ value = readl(host->base + SPMMC_SD_INT_REG);
+ value &= ~SPMMC_SDINT_SDCMPEN; /* sdcmpen */
+ writel(value, host->base + SPMMC_SD_INT_REG);
+ spmmc_trigger_transaction(host);
+ spmmc_xfer_data_pio(host, data);
+ spmmc_wait_finish(host);
+ spmmc_finish_request(host, mrq);
+ } else {
+ if (!(host->use_int || host->dma_use_int)) {
+ spmmc_trigger_transaction(host);
+ spmmc_wait_finish(host);
+ spmmc_finish_request(host, mrq);
+ } else {
+ spmmc_trigger_transaction(host);
+ }
+ }
+ }
+}
+
+static void spmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct spmmc_host *host = (struct spmmc_host *)mmc_priv(mmc);
+
+ mutex_lock(&host->mrq_lock);
+ spmmc_set_power_mode(host, ios);
+ spmmc_set_bus_clk(host, ios->clock);
+ spmmc_set_bus_timing(host, ios->timing);
+ spmmc_set_bus_width(host, ios->bus_width);
+ /* ensure mode is correct, because we might have hw reset the controller */
+ spmmc_select_mode(host);
+ mutex_unlock(&host->mrq_lock);
+}
+
+/*
+ * Return values for the get_cd callback should be:
+ * 0 for a absent card
+ * 1 for a present card
+ * -ENOSYS when not supported (equal to NULL callback)
+ * or a negative errno value when something bad happened
+ */
+int spmmc_get_cd(struct mmc_host *mmc)
+{
+ int ret = 0;
+
+ if (mmc_can_gpio_cd(mmc))
+ ret = mmc_gpio_get_cd(mmc);
+
+ if (ret < 0)
+ ret = 0;
+
+ return ret;
+}
+
+static int spmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
+{
+ struct spmmc_host *host = mmc_priv(mmc);
+ const u8 *blk_pattern;
+ u8 *blk_test;
+ int blksz;
+ u8 smpl_dly = 0, candidate_dly = 0;
+ u32 value;
+
+ if (mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
+ blk_pattern = tuning_blk_pattern_8bit;
+ blksz = sizeof(tuning_blk_pattern_8bit);
+ } else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
+ blk_pattern = tuning_blk_pattern_4bit;
+ blksz = sizeof(tuning_blk_pattern_4bit);
+ } else {
+ return -EINVAL;
+ }
+
+ blk_test = kmalloc(blksz, GFP_KERNEL);
+ if (!blk_test)
+ return -ENOMEM;
+
+ host->tuning_info.enable_tuning = 0;
+ do {
+ struct mmc_request mrq = {NULL};
+ struct mmc_command cmd = {0};
+ struct mmc_command stop = {0};
+ struct mmc_data data = {0};
+ struct scatterlist sg;
+
+ cmd.opcode = opcode;
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+
+ stop.opcode = MMC_STOP_TRANSMISSION;
+ stop.arg = 0;
+ stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
+
+ data.blksz = blksz;
+ data.blocks = 1;
+ data.flags = MMC_DATA_READ;
+ data.sg = &sg;
+ data.sg_len = 1;
+
+ sg_init_one(&sg, blk_test, blksz);
+ mrq.cmd = &cmd;
+ mrq.stop = &stop;
+ mrq.data = &data;
+ host->mrq = &mrq;
+
+ value = readl(host->base + SPMMC_SD_TIMING_CONFIG0_REG);
+ value |= FIELD_PREP(SPMMC_SD_READ_RESPONSE_DELAY, smpl_dly);
+ value |= FIELD_PREP(SPMMC_SD_READ_DATA_DELAY, smpl_dly);
+ value |= FIELD_PREP(SPMMC_SD_READ_CRC_DELAY, smpl_dly);
+ writel(value, host->base + SPMMC_SD_TIMING_CONFIG0_REG);
+
+ mmc_wait_for_req(mmc, &mrq);
+ if (!cmd.error && !data.error) {
+ if (!memcmp(blk_pattern, blk_test, blksz))
+ candidate_dly |= (1 << smpl_dly);
+ }
+ } while (smpl_dly++ <= SPMMC_MAX_TUNABLE_DLY);
+ host->tuning_info.enable_tuning = 1;
+
+ if (candidate_dly) {
+ smpl_dly = __find_best_delay(candidate_dly);
+ value = readl(host->base + SPMMC_SD_TIMING_CONFIG0_REG);
+ value |= FIELD_PREP(SPMMC_SD_READ_RESPONSE_DELAY, smpl_dly);
+ value |= FIELD_PREP(SPMMC_SD_READ_DATA_DELAY, smpl_dly);
+ value |= FIELD_PREP(SPMMC_SD_READ_CRC_DELAY, smpl_dly);
+ writel(value, host->base + SPMMC_SD_TIMING_CONFIG0_REG);
+ return 0;
+ }
+
+ return -EIO;
+}
+
+static void spmmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+ struct spmmc_host *host = mmc_priv(mmc);
+ u32 value = readl(host->base + SPMMC_SD_INT_REG);
+
+ value &= ~SPMMC_SDINT_SDIOCLR;
+ value |= FIELD_PREP(SPMMC_SDINT_SDIOCLR, 1); /* sdio_int_clr */
+ if (enable)
+ value |= SPMMC_SDINT_SDIOEN;
+ else
+ value &= ~SPMMC_SDINT_SDIOEN;
+ writel(value, host->base + SPMMC_SD_INT_REG);
+}
+
+static const struct mmc_host_ops spmmc_ops = {
+ .request = spmmc_request,
+ .set_ios = spmmc_set_ios,
+ .get_cd = spmmc_get_cd,
+ .execute_tuning = spmmc_execute_tuning,
+ .enable_sdio_irq = spmmc_enable_sdio_irq,
+};
+
+static void tsklet_func_finish_req(unsigned long data)
+{
+ struct spmmc_host *host = (struct spmmc_host *)data;
+
+ spin_lock(&host->lock);
+ spmmc_finish_request(host, host->mrq);
+ spin_unlock(&host->lock);
+}
+
+static int spmmc_drv_probe(struct platform_device *pdev)
+{
+ struct mmc_host *mmc;
+ struct resource *res;
+ struct spmmc_host *host;
+ unsigned int mode;
+ int ret = 0;
+
+ mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
+ if (!mmc) {
+ ret = -ENOMEM;
+ goto probe_free_host;
+ }
+
+ host = mmc_priv(mmc);
+ host->mmc = mmc;
+ host->power_state = MMC_POWER_OFF;
+ host->dma_int_threshold = 1024;
+ host->dmapio_mode = SPMMC_DMA_MODE;
+
+ host->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+ if (IS_ERR(host->base))
+ return PTR_ERR(host->base);
+
+ host->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(host->clk))
+ return dev_err_probe(&pdev->dev, PTR_ERR(host->clk), "clk get fail\n");
+
+ host->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+ if (IS_ERR(host->rstc))
+ return dev_err_probe(&pdev->dev, PTR_ERR(host->rstc), "rst get fail\n");
+
+ host->irq = platform_get_irq(pdev, 0);
+ if (host->irq <= 0)
+ return host->irq;
+
+ ret = devm_request_irq(&pdev->dev, host->irq, spmmc_irq, IRQF_SHARED,
+ dev_name(&pdev->dev), host);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(host->clk);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret, "failed to enable clk\n");
+
+ ret = mmc_of_parse(mmc);
+ if (ret)
+ goto probe_free_host;
+
+ spin_lock_init(&host->lock);
+ mutex_init(&host->mrq_lock);
+ tasklet_init(&host->tsklet_finish_req, tsklet_func_finish_req, (unsigned long)host);
+ mmc->ops = &spmmc_ops;
+ mmc->f_min = SPMMC_MIN_CLK;
+ if (mmc->f_max > SPMMC_MAX_CLK)
+ mmc->f_max = SPMMC_MAX_CLK;
+
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+ mmc->max_seg_size = SPMMC_MAX_BLK_COUNT * 512;
+ /* Host controller supports up to "SPMMC_MAX_DMA_MEMORY_SECTORS"*/
+ /* a.k.a. max scattered memory segments per request*/
+ mmc->max_segs = SPMMC_MAX_DMA_MEMORY_SECTORS;
+ mmc->max_req_size = SPMMC_MAX_BLK_COUNT * 512;
+ /* Limited by the max value of dma_size & data_length, set it to 512 bytes for now */
+ mmc->max_blk_size = 512;
+ mmc->max_blk_count = SPMMC_MAX_BLK_COUNT; /* Limited by sd_page_num */
+
+ dev_set_drvdata(&pdev->dev, host);
+ spmmc_controller_init(host);
+ mode = (int)of_device_get_match_data(&pdev->dev);
+ spmmc_select_mode(host);
+ mmc_add_host(mmc);
+ host->tuning_info.enable_tuning = 1;
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
+ return ret;
+
+probe_free_host:
+ if (mmc)
+ mmc_free_host(mmc);
+
+ return ret;
+}
+
+static int spmmc_drv_remove(struct platform_device *dev)
+{
+ struct spmmc_host *host = platform_get_drvdata(dev);
+
+ mmc_remove_host(host->mmc);
+ clk_disable(host->clk);
+ clk_unprepare(host->clk);
+ pm_runtime_disable(&dev->dev);
+ platform_set_drvdata(dev, NULL);
+ mmc_free_host(host->mmc);
+
+ return 0;
+}
+
+static int spmmc_drv_suspend(struct platform_device *dev, pm_message_t state)
+{
+ struct spmmc_host *host;
+
+ host = platform_get_drvdata(dev);
+ mutex_lock(&host->mrq_lock); /* Make sure that no one is holding the controller */
+ mutex_unlock(&host->mrq_lock);
+ clk_disable(host->clk);
+
+ return 0;
+}
+
+static int spmmc_drv_resume(struct platform_device *dev)
+{
+ struct spmmc_host *host;
+
+ host = platform_get_drvdata(dev);
+
+ return clk_enable(host->clk);
+}
+
+#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
+static int spmmc_pm_suspend(struct device *dev)
+{
+ pm_runtime_force_suspend(dev);
+
+ return 0;
+}
+
+static int spmmc_pm_resume(struct device *dev)
+{
+ pm_runtime_force_resume(dev);
+
+ return 0;
+}
+#endif /* ifdef CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM_RUNTIME
+static int spmmc_pm_runtime_suspend(struct device *dev)
+{
+ struct spmmc_host *host;
+
+ host = dev_get_drvdata(dev);
+ clk_disable(host->clk);
+
+ return 0;
+}
+
+static int spmmc_pm_runtime_resume(struct device *dev)
+{
+ struct spmmc_host *host;
+
+ host = dev_get_drvdata(dev);
+
+ return clk_enable(host->clk);
+}
+#endif /* ifdef CONFIG_PM_RUNTIME */
+
+static const struct dev_pm_ops spmmc_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(spmmc_pm_suspend, spmmc_pm_resume)
+#ifdef CONFIG_PM_RUNTIME
+ SET_RUNTIME_PM_OPS(spmmc_pm_runtime_suspend, spmmc_pm_runtime_resume, NULL)
+#endif
+};
+#endif /* ifdef CONFIG_PM */
+
+static const struct of_device_id spmmc_of_table[] = {
+ {
+ .compatible = "sunplus,sp7021-mmc",
+ },
+ {/* sentinel */}
+};
+MODULE_DEVICE_TABLE(of, spmmc_of_table);
+
+static struct platform_driver spmmc_driver = {
+ .probe = spmmc_drv_probe,
+ .remove = spmmc_drv_remove,
+ .suspend = spmmc_drv_suspend,
+ .resume = spmmc_drv_resume,
+ .driver = {
+ .name = "spmmc",
+#ifdef CONFIG_PM
+ .pm = &spmmc_pm_ops,
+#endif
+ .of_match_table = spmmc_of_table,
+ },
+};
+module_platform_driver(spmmc_driver);
+
+MODULE_AUTHOR("Tony Huang <tonyhuang.sunplus@gmail.com>");
+MODULE_AUTHOR("Li-hao Kuo <lhjeff911@gmail.com>");
+MODULE_DESCRIPTION("Sunplus MMC controller driver");
+MODULE_LICENSE("GPL");
--
2.7.4
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