mmc: mediatek: Add Mediatek MMC driver

Add Mediatek MMC driver code
Support eMMC/SD/SDIO
Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/Kconfig

@@ -776,3 +776,11 @@ config MMC_TOSHIBA_PCI
 	tristate "Toshiba Type A SD/MMC Card Interface Driver"
 	depends on PCI
 	help
+
+config MMC_MTK
+	tristate "MediaTek SD/MMC Card Interface support"
+	help
+	  This selects the MediaTek(R) Secure digital and Multimedia card Interface.
+	  If you have a machine with a integrated SD/MMC card reader, say Y or M here.
+	  This is needed if support for any SD/SDIO/MMC devices is required.
+	  If unsure, say N.

drivers/mmc/host/Makefile

@@ -20,6 +20,7 @@ obj-$(CONFIG_MMC_SDHCI_F_SDH30)	+= sdhci_f_sdh30.o
 obj-$(CONFIG_MMC_SDHCI_SPEAR)	+= sdhci-spear.o
 obj-$(CONFIG_MMC_WBSD)		+= wbsd.o
 obj-$(CONFIG_MMC_AU1X)		+= au1xmmc.o
+obj-$(CONFIG_MMC_MTK)		+= mtk-sd.o
 obj-$(CONFIG_MMC_OMAP)		+= omap.o
 obj-$(CONFIG_MMC_OMAP_HS)	+= omap_hsmmc.o
 obj-$(CONFIG_MMC_ATMELMCI)	+= atmel-mci.o

drivers/mmc/host/mtk-sd.c

+/*
+ * Copyright (c) 2014-2015 MediaTek Inc.
+ * Author: Chaotian.Jing <chaotian.jing@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spinlock.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/core.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sd.h>
+#include <linux/mmc/sdio.h>
+
+#define MAX_BD_NUM          1024
+
+/*--------------------------------------------------------------------------*/
+/* Common Definition                                                        */
+/*--------------------------------------------------------------------------*/
+#define MSDC_BUS_1BITS          0x0
+#define MSDC_BUS_4BITS          0x1
+#define MSDC_BUS_8BITS          0x2
+
+#define MSDC_BURST_64B          0x6
+
+/*--------------------------------------------------------------------------*/
+/* Register Offset                                                          */
+/*--------------------------------------------------------------------------*/
+#define MSDC_CFG         0x0
+#define MSDC_IOCON       0x04
+#define MSDC_PS          0x08
+#define MSDC_INT         0x0c
+#define MSDC_INTEN       0x10
+#define MSDC_FIFOCS      0x14
+#define SDC_CFG          0x30
+#define SDC_CMD          0x34
+#define SDC_ARG          0x38
+#define SDC_STS          0x3c
+#define SDC_RESP0        0x40
+#define SDC_RESP1        0x44
+#define SDC_RESP2        0x48
+#define SDC_RESP3        0x4c
+#define SDC_BLK_NUM      0x50
+#define SDC_ACMD_RESP    0x80
+#define MSDC_DMA_SA      0x90
+#define MSDC_DMA_CTRL    0x98
+#define MSDC_DMA_CFG     0x9c
+#define MSDC_PATCH_BIT   0xb0
+#define MSDC_PATCH_BIT1  0xb4
+#define MSDC_PAD_TUNE    0xec
+
+/*--------------------------------------------------------------------------*/
+/* Register Mask                                                            */
+/*--------------------------------------------------------------------------*/
+
+/* MSDC_CFG mask */
+#define MSDC_CFG_MODE           (0x1 << 0)	/* RW */
+#define MSDC_CFG_CKPDN          (0x1 << 1)	/* RW */
+#define MSDC_CFG_RST            (0x1 << 2)	/* RW */
+#define MSDC_CFG_PIO            (0x1 << 3)	/* RW */
+#define MSDC_CFG_CKDRVEN        (0x1 << 4)	/* RW */
+#define MSDC_CFG_BV18SDT        (0x1 << 5)	/* RW */
+#define MSDC_CFG_BV18PSS        (0x1 << 6)	/* R  */
+#define MSDC_CFG_CKSTB          (0x1 << 7)	/* R  */
+#define MSDC_CFG_CKDIV          (0xff << 8)	/* RW */
+#define MSDC_CFG_CKMOD          (0x3 << 16)	/* RW */
+
+/* MSDC_IOCON mask */
+#define MSDC_IOCON_SDR104CKS    (0x1 << 0)	/* RW */
+#define MSDC_IOCON_RSPL         (0x1 << 1)	/* RW */
+#define MSDC_IOCON_DSPL         (0x1 << 2)	/* RW */
+#define MSDC_IOCON_DDLSEL       (0x1 << 3)	/* RW */
+#define MSDC_IOCON_DDR50CKD     (0x1 << 4)	/* RW */
+#define MSDC_IOCON_DSPLSEL      (0x1 << 5)	/* RW */
+#define MSDC_IOCON_W_DSPL       (0x1 << 8)	/* RW */
+#define MSDC_IOCON_D0SPL        (0x1 << 16)	/* RW */
+#define MSDC_IOCON_D1SPL        (0x1 << 17)	/* RW */
+#define MSDC_IOCON_D2SPL        (0x1 << 18)	/* RW */
+#define MSDC_IOCON_D3SPL        (0x1 << 19)	/* RW */
+#define MSDC_IOCON_D4SPL        (0x1 << 20)	/* RW */
+#define MSDC_IOCON_D5SPL        (0x1 << 21)	/* RW */
+#define MSDC_IOCON_D6SPL        (0x1 << 22)	/* RW */
+#define MSDC_IOCON_D7SPL        (0x1 << 23)	/* RW */
+#define MSDC_IOCON_RISCSZ       (0x3 << 24)	/* RW */
+
+/* MSDC_PS mask */
+#define MSDC_PS_CDEN            (0x1 << 0)	/* RW */
+#define MSDC_PS_CDSTS           (0x1 << 1)	/* R  */
+#define MSDC_PS_CDDEBOUNCE      (0xf << 12)	/* RW */
+#define MSDC_PS_DAT             (0xff << 16)	/* R  */
+#define MSDC_PS_CMD             (0x1 << 24)	/* R  */
+#define MSDC_PS_WP              (0x1 << 31)	/* R  */
+
+/* MSDC_INT mask */
+#define MSDC_INT_MMCIRQ         (0x1 << 0)	/* W1C */
+#define MSDC_INT_CDSC           (0x1 << 1)	/* W1C */
+#define MSDC_INT_ACMDRDY        (0x1 << 3)	/* W1C */
+#define MSDC_INT_ACMDTMO        (0x1 << 4)	/* W1C */
+#define MSDC_INT_ACMDCRCERR     (0x1 << 5)	/* W1C */
+#define MSDC_INT_DMAQ_EMPTY     (0x1 << 6)	/* W1C */
+#define MSDC_INT_SDIOIRQ        (0x1 << 7)	/* W1C */
+#define MSDC_INT_CMDRDY         (0x1 << 8)	/* W1C */
+#define MSDC_INT_CMDTMO         (0x1 << 9)	/* W1C */
+#define MSDC_INT_RSPCRCERR      (0x1 << 10)	/* W1C */
+#define MSDC_INT_CSTA           (0x1 << 11)	/* R */
+#define MSDC_INT_XFER_COMPL     (0x1 << 12)	/* W1C */
+#define MSDC_INT_DXFER_DONE     (0x1 << 13)	/* W1C */
+#define MSDC_INT_DATTMO         (0x1 << 14)	/* W1C */
+#define MSDC_INT_DATCRCERR      (0x1 << 15)	/* W1C */
+#define MSDC_INT_ACMD19_DONE    (0x1 << 16)	/* W1C */
+#define MSDC_INT_DMA_BDCSERR    (0x1 << 17)	/* W1C */
+#define MSDC_INT_DMA_GPDCSERR   (0x1 << 18)	/* W1C */
+#define MSDC_INT_DMA_PROTECT    (0x1 << 19)	/* W1C */
+
+/* MSDC_INTEN mask */
+#define MSDC_INTEN_MMCIRQ       (0x1 << 0)	/* RW */
+#define MSDC_INTEN_CDSC         (0x1 << 1)	/* RW */
+#define MSDC_INTEN_ACMDRDY      (0x1 << 3)	/* RW */
+#define MSDC_INTEN_ACMDTMO      (0x1 << 4)	/* RW */
+#define MSDC_INTEN_ACMDCRCERR   (0x1 << 5)	/* RW */
+#define MSDC_INTEN_DMAQ_EMPTY   (0x1 << 6)	/* RW */
+#define MSDC_INTEN_SDIOIRQ      (0x1 << 7)	/* RW */
+#define MSDC_INTEN_CMDRDY       (0x1 << 8)	/* RW */
+#define MSDC_INTEN_CMDTMO       (0x1 << 9)	/* RW */
+#define MSDC_INTEN_RSPCRCERR    (0x1 << 10)	/* RW */
+#define MSDC_INTEN_CSTA         (0x1 << 11)	/* RW */
+#define MSDC_INTEN_XFER_COMPL   (0x1 << 12)	/* RW */
+#define MSDC_INTEN_DXFER_DONE   (0x1 << 13)	/* RW */
+#define MSDC_INTEN_DATTMO       (0x1 << 14)	/* RW */
+#define MSDC_INTEN_DATCRCERR    (0x1 << 15)	/* RW */
+#define MSDC_INTEN_ACMD19_DONE  (0x1 << 16)	/* RW */
+#define MSDC_INTEN_DMA_BDCSERR  (0x1 << 17)	/* RW */
+#define MSDC_INTEN_DMA_GPDCSERR (0x1 << 18)	/* RW */
+#define MSDC_INTEN_DMA_PROTECT  (0x1 << 19)	/* RW */
+
+/* MSDC_FIFOCS mask */
+#define MSDC_FIFOCS_RXCNT       (0xff << 0)	/* R */
+#define MSDC_FIFOCS_TXCNT       (0xff << 16)	/* R */
+#define MSDC_FIFOCS_CLR         (0x1 << 31)	/* RW */
+
+/* SDC_CFG mask */
+#define SDC_CFG_SDIOINTWKUP     (0x1 << 0)	/* RW */
+#define SDC_CFG_INSWKUP         (0x1 << 1)	/* RW */
+#define SDC_CFG_BUSWIDTH        (0x3 << 16)	/* RW */
+#define SDC_CFG_SDIO            (0x1 << 19)	/* RW */
+#define SDC_CFG_SDIOIDE         (0x1 << 20)	/* RW */
+#define SDC_CFG_INTATGAP        (0x1 << 21)	/* RW */
+#define SDC_CFG_DTOC            (0xff << 24)	/* RW */
+
+/* SDC_STS mask */
+#define SDC_STS_SDCBUSY         (0x1 << 0)	/* RW */
+#define SDC_STS_CMDBUSY         (0x1 << 1)	/* RW */
+#define SDC_STS_SWR_COMPL       (0x1 << 31)	/* RW */
+
+/* MSDC_DMA_CTRL mask */
+#define MSDC_DMA_CTRL_START     (0x1 << 0)	/* W */
+#define MSDC_DMA_CTRL_STOP      (0x1 << 1)	/* W */
+#define MSDC_DMA_CTRL_RESUME    (0x1 << 2)	/* W */
+#define MSDC_DMA_CTRL_MODE      (0x1 << 8)	/* RW */
+#define MSDC_DMA_CTRL_LASTBUF   (0x1 << 10)	/* RW */
+#define MSDC_DMA_CTRL_BRUSTSZ   (0x7 << 12)	/* RW */
+
+/* MSDC_DMA_CFG mask */
+#define MSDC_DMA_CFG_STS        (0x1 << 0)	/* R */
+#define MSDC_DMA_CFG_DECSEN     (0x1 << 1)	/* RW */
+#define MSDC_DMA_CFG_AHBHPROT2  (0x2 << 8)	/* RW */
+#define MSDC_DMA_CFG_ACTIVEEN   (0x2 << 12)	/* RW */
+#define MSDC_DMA_CFG_CS12B16B   (0x1 << 16)	/* RW */
+
+/* MSDC_PATCH_BIT mask */
+#define MSDC_PATCH_BIT_ODDSUPP    (0x1 <<  1)	/* RW */
+#define MSDC_INT_DAT_LATCH_CK_SEL (0x7 <<  7)
+#define MSDC_CKGEN_MSDC_DLY_SEL   (0x1f << 10)
+#define MSDC_PATCH_BIT_IODSSEL    (0x1 << 16)	/* RW */
+#define MSDC_PATCH_BIT_IOINTSEL   (0x1 << 17)	/* RW */
+#define MSDC_PATCH_BIT_BUSYDLY    (0xf << 18)	/* RW */
+#define MSDC_PATCH_BIT_WDOD       (0xf << 22)	/* RW */
+#define MSDC_PATCH_BIT_IDRTSEL    (0x1 << 26)	/* RW */
+#define MSDC_PATCH_BIT_CMDFSEL    (0x1 << 27)	/* RW */
+#define MSDC_PATCH_BIT_INTDLSEL   (0x1 << 28)	/* RW */
+#define MSDC_PATCH_BIT_SPCPUSH    (0x1 << 29)	/* RW */
+#define MSDC_PATCH_BIT_DECRCTMO   (0x1 << 30)	/* RW */
+
+#define REQ_CMD_EIO  (0x1 << 0)
+#define REQ_CMD_TMO  (0x1 << 1)
+#define REQ_DAT_ERR  (0x1 << 2)
+#define REQ_STOP_EIO (0x1 << 3)
+#define REQ_STOP_TMO (0x1 << 4)
+#define REQ_CMD_BUSY (0x1 << 5)
+
+#define MSDC_PREPARE_FLAG (0x1 << 0)
+#define MSDC_ASYNC_FLAG (0x1 << 1)
+#define MSDC_MMAP_FLAG (0x1 << 2)
+
+#define CMD_TIMEOUT         (HZ/10 * 5)	/* 100ms x5 */
+#define DAT_TIMEOUT         (HZ    * 5)	/* 1000ms x5 */
+
+/*--------------------------------------------------------------------------*/
+/* Descriptor Structure                                                     */
+/*--------------------------------------------------------------------------*/
+struct mt_gpdma_desc {
+	u32 gpd_info;
+#define GPDMA_DESC_HWO		(0x1 << 0)
+#define GPDMA_DESC_BDP		(0x1 << 1)
+#define GPDMA_DESC_CHECKSUM	(0xff << 8) /* bit8 ~ bit15 */
+#define GPDMA_DESC_INT		(0x1 << 16)
+	u32 next;
+	u32 ptr;
+	u32 gpd_data_len;
+#define GPDMA_DESC_BUFLEN	(0xffff) /* bit0 ~ bit15 */
+#define GPDMA_DESC_EXTLEN	(0xff << 16) /* bit16 ~ bit23 */
+	u32 arg;
+	u32 blknum;
+	u32 cmd;
+};
+
+struct mt_bdma_desc {
+	u32 bd_info;
+#define BDMA_DESC_EOL		(0x1 << 0)
+#define BDMA_DESC_CHECKSUM	(0xff << 8) /* bit8 ~ bit15 */
+#define BDMA_DESC_BLKPAD	(0x1 << 17)
+#define BDMA_DESC_DWPAD		(0x1 << 18)
+	u32 next;
+	u32 ptr;
+	u32 bd_data_len;
+#define BDMA_DESC_BUFLEN	(0xffff) /* bit0 ~ bit15 */
+};
+
+struct msdc_dma {
+	struct scatterlist *sg;	/* I/O scatter list */
+	struct mt_gpdma_desc *gpd;		/* pointer to gpd array */
+	struct mt_bdma_desc *bd;		/* pointer to bd array */
+	dma_addr_t gpd_addr;	/* the physical address of gpd array */
+	dma_addr_t bd_addr;	/* the physical address of bd array */
+};
+
+struct msdc_host {
+	struct device *dev;
+	struct mmc_host *mmc;	/* mmc structure */
+	int cmd_rsp;
+
+	spinlock_t lock;
+	struct mmc_request *mrq;
+	struct mmc_command *cmd;
+	struct mmc_data *data;
+	int error;
+
+	void __iomem *base;		/* host base address */
+
+	struct msdc_dma dma;	/* dma channel */
+	u64 dma_mask;
+
+	u32 timeout_ns;		/* data timeout ns */
+	u32 timeout_clks;	/* data timeout clks */
+
+	struct pinctrl *pinctrl;
+	struct pinctrl_state *pins_default;
+	struct pinctrl_state *pins_uhs;
+	struct delayed_work req_timeout;
+	int irq;		/* host interrupt */
+
+	struct clk *src_clk;	/* msdc source clock */
+	struct clk *h_clk;      /* msdc h_clk */
+	u32 mclk;		/* mmc subsystem clock frequency */
+	u32 src_clk_freq;	/* source clock frequency */
+	u32 sclk;		/* SD/MS bus clock frequency */
+	bool ddr;
+	bool vqmmc_enabled;
+};
+
+static void sdr_set_bits(void __iomem *reg, u32 bs)
+{
+	u32 val = readl(reg);
+
+	val |= bs;
+	writel(val, reg);
+}
+
+static void sdr_clr_bits(void __iomem *reg, u32 bs)
+{
+	u32 val = readl(reg);
+
+	val &= ~bs;
+	writel(val, reg);
+}
+
+static void sdr_set_field(void __iomem *reg, u32 field, u32 val)
+{
+	unsigned int tv = readl(reg);
+
+	tv &= ~field;
+	tv |= ((val) << (ffs((unsigned int)field) - 1));
+	writel(tv, reg);
+}
+
+static void sdr_get_field(void __iomem *reg, u32 field, u32 *val)
+{
+	unsigned int tv = readl(reg);
+
+	*val = ((tv & field) >> (ffs((unsigned int)field) - 1));
+}
+
+static void msdc_reset_hw(struct msdc_host *host)
+{
+	u32 val;
+
+	sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_RST);
+	while (readl(host->base + MSDC_CFG) & MSDC_CFG_RST)
+		cpu_relax();
+
+	sdr_set_bits(host->base + MSDC_FIFOCS, MSDC_FIFOCS_CLR);
+	while (readl(host->base + MSDC_FIFOCS) & MSDC_FIFOCS_CLR)
+		cpu_relax();
+
+	val = readl(host->base + MSDC_INT);
+	writel(val, host->base + MSDC_INT);
+}
+
+static void msdc_cmd_next(struct msdc_host *host,
+		struct mmc_request *mrq, struct mmc_command *cmd);
+
+static u32 data_ints_mask = MSDC_INTEN_XFER_COMPL | MSDC_INTEN_DATTMO |
+			MSDC_INTEN_DATCRCERR | MSDC_INTEN_DMA_BDCSERR |
+			MSDC_INTEN_DMA_GPDCSERR | MSDC_INTEN_DMA_PROTECT;
+
+static u8 msdc_dma_calcs(u8 *buf, u32 len)
+{
+	u32 i, sum = 0;
+
+	for (i = 0; i < len; i++)
+		sum += buf[i];
+	return 0xff - (u8) sum;
+}
+
+static inline void msdc_dma_setup(struct msdc_host *host, struct msdc_dma *dma,
+		struct mmc_data *data)
+{
+	unsigned int j, dma_len;
+	dma_addr_t dma_address;
+	u32 dma_ctrl;
+	struct scatterlist *sg;
+	struct mt_gpdma_desc *gpd;
+	struct mt_bdma_desc *bd;
+
+	sg = data->sg;
+
+	gpd = dma->gpd;
+	bd = dma->bd;
+
+	/* modify gpd */
+	gpd->gpd_info |= GPDMA_DESC_HWO;
+	gpd->gpd_info |= GPDMA_DESC_BDP;
+	/* need to clear first. use these bits to calc checksum */
+	gpd->gpd_info &= ~GPDMA_DESC_CHECKSUM;
+	gpd->gpd_info |= msdc_dma_calcs((u8 *) gpd, 16) << 8;
+
+	/* modify bd */
+	for_each_sg(data->sg, sg, data->sg_count, j) {
+		dma_address = sg_dma_address(sg);
+		dma_len = sg_dma_len(sg);
+
+		/* init bd */
+		bd[j].bd_info &= ~BDMA_DESC_BLKPAD;
+		bd[j].bd_info &= ~BDMA_DESC_DWPAD;
+		bd[j].ptr = (u32)dma_address;
+		bd[j].bd_data_len &= ~BDMA_DESC_BUFLEN;
+		bd[j].bd_data_len |= (dma_len & BDMA_DESC_BUFLEN);
+
+		if (j == data->sg_count - 1) /* the last bd */
+			bd[j].bd_info |= BDMA_DESC_EOL;
+		else
+			bd[j].bd_info &= ~BDMA_DESC_EOL;
+
+		/* checksume need to clear first */
+		bd[j].bd_info &= ~BDMA_DESC_CHECKSUM;
+		bd[j].bd_info |= msdc_dma_calcs((u8 *)(&bd[j]), 16) << 8;
+	}
+
+	sdr_set_field(host->base + MSDC_DMA_CFG, MSDC_DMA_CFG_DECSEN, 1);
+	dma_ctrl = readl_relaxed(host->base + MSDC_DMA_CTRL);
+	dma_ctrl &= ~(MSDC_DMA_CTRL_BRUSTSZ | MSDC_DMA_CTRL_MODE);
+	dma_ctrl |= (MSDC_BURST_64B << 12 | 1 << 8);
+	writel_relaxed(dma_ctrl, host->base + MSDC_DMA_CTRL);
+	writel((u32)dma->gpd_addr, host->base + MSDC_DMA_SA);
+}
+
+static void msdc_prepare_data(struct msdc_host *host, struct mmc_request *mrq)
+{
+	struct mmc_data *data = mrq->data;
+
+	if (!(data->host_cookie & MSDC_PREPARE_FLAG)) {
+		bool read = (data->flags & MMC_DATA_READ) != 0;
+
+		data->host_cookie |= MSDC_PREPARE_FLAG;
+		data->sg_count = dma_map_sg(host->dev, data->sg, data->sg_len,
+					   read ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+	}
+}
+
+static void msdc_unprepare_data(struct msdc_host *host, struct mmc_request *mrq)
+{
+	struct mmc_data *data = mrq->data;
+
+	if (data->host_cookie & MSDC_ASYNC_FLAG)
+		return;
+
+	if (data->host_cookie & MSDC_PREPARE_FLAG) {
+		bool read = (data->flags & MMC_DATA_READ) != 0;
+
+		dma_unmap_sg(host->dev, data->sg, data->sg_len,
+			     read ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+		data->host_cookie &= ~MSDC_PREPARE_FLAG;
+	}
+}
+
+/* clock control primitives */
+static void msdc_set_timeout(struct msdc_host *host, u32 ns, u32 clks)
+{
+	u32 timeout, clk_ns;
+	u32 mode = 0;
+
+	host->timeout_ns = ns;
+	host->timeout_clks = clks;
+	if (host->sclk == 0) {
+		timeout = 0;
+	} else {
+		clk_ns  = 1000000000UL / host->sclk;
+		timeout = (ns + clk_ns - 1) / clk_ns + clks;
+		/* in 1048576 sclk cycle unit */
+		timeout = (timeout + (0x1 << 20) - 1) >> 20;
+		sdr_get_field(host->base + MSDC_CFG, MSDC_CFG_CKMOD, &mode);
+		/*DDR mode will double the clk cycles for data timeout */
+		timeout = mode >= 2 ? timeout * 2 : timeout;
+		timeout = timeout > 1 ? timeout - 1 : 0;
+		timeout = timeout > 255 ? 255 : timeout;
+	}
+	sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, timeout);
+}
+
+static void msdc_gate_clock(struct msdc_host *host)
+{
+	clk_disable_unprepare(host->src_clk);
+	clk_disable_unprepare(host->h_clk);
+}
+
+static void msdc_ungate_clock(struct msdc_host *host)
+{
+	clk_prepare_enable(host->h_clk);
+	clk_prepare_enable(host->src_clk);
+	while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB))
+		cpu_relax();
+}
+
+static void msdc_set_mclk(struct msdc_host *host, int ddr, u32 hz)
+{
+	u32 mode;
+	u32 flags;
+	u32 div;
+	u32 sclk;
+
+	if (!hz) {
+		dev_dbg(host->dev, "set mclk to 0\n");
+		host->mclk = 0;
+		sdr_clr_bits(host->base + MSDC_CFG, MSDC_CFG_CKPDN);
+		return;
+	}
+
+	flags = readl(host->base + MSDC_INTEN);
+	sdr_clr_bits(host->base + MSDC_INTEN, flags);
+	if (ddr) { /* may need to modify later */
+		mode = 0x2; /* ddr mode and use divisor */
+		if (hz >= (host->src_clk_freq >> 2)) {
+			div = 0; /* mean div = 1/4 */
+			sclk = host->src_clk_freq >> 2; /* sclk = clk / 4 */
+		} else {
+			div = (host->src_clk_freq + ((hz << 2) - 1)) / (hz << 2);
+			sclk = (host->src_clk_freq >> 2) / div;
+			div = (div >> 1);
+		}
+	} else if (hz >= host->src_clk_freq) {
+		mode = 0x1; /* no divisor */
+		div = 0;
+		sclk = host->src_clk_freq;
+	} else {
+		mode = 0x0; /* use divisor */
+		if (hz >= (host->src_clk_freq >> 1)) {
+			div = 0; /* mean div = 1/2 */
+			sclk = host->src_clk_freq >> 1; /* sclk = clk / 2 */
+		} else {
+			div = (host->src_clk_freq + ((hz << 2) - 1)) / (hz << 2);
+			sclk = (host->src_clk_freq >> 2) / div;
+		}
+	}
+	sdr_set_field(host->base + MSDC_CFG, MSDC_CFG_CKMOD | MSDC_CFG_CKDIV,
+			(mode << 8) | (div % 0xff));
+	sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_CKPDN);
+	while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB))
+		cpu_relax();
+	host->sclk = sclk;
+	host->mclk = hz;
+	host->ddr = ddr;
+	/* need because clk changed. */
+	msdc_set_timeout(host, host->timeout_ns, host->timeout_clks);
+	sdr_set_bits(host->base + MSDC_INTEN, flags);
+
+	dev_dbg(host->dev, "sclk: %d, ddr: %d\n", host->sclk, ddr);
+}
+
+static inline u32 msdc_cmd_find_resp(struct msdc_host *host,
+		struct mmc_request *mrq, struct mmc_command *cmd)
+{
+	u32 resp;
+
+	switch (mmc_resp_type(cmd)) {
+		/* Actually, R1, R5, R6, R7 are the same */
+	case MMC_RSP_R1:
+		resp = 0x1;
+		break;
+	case MMC_RSP_R1B:
+		resp = 0x7;
+		break;
+	case MMC_RSP_R2:
+		resp = 0x2;
+		break;
+	case MMC_RSP_R3:
+		resp = 0x3;
+		break;
+	case MMC_RSP_NONE:
+	default:
+		resp = 0x0;
+		break;
+	}
+
+	return resp;
+}
+
+static inline u32 msdc_cmd_prepare_raw_cmd(struct msdc_host *host,
+		struct mmc_request *mrq, struct mmc_command *cmd)
+{
+	/* rawcmd :
+	 * vol_swt << 30 | auto_cmd << 28 | blklen << 16 | go_irq << 15 |
+	 * stop << 14 | rw << 13 | dtype << 11 | rsptyp << 7 | brk << 6 | opcode
+	 */
+	u32 opcode = cmd->opcode;
+	u32 resp = msdc_cmd_find_resp(host, mrq, cmd);
+	u32 rawcmd = (opcode & 0x3f) | ((resp & 0x7) << 7);
+
+	host->cmd_rsp = resp;
+
+	if ((opcode == SD_IO_RW_DIRECT && cmd->flags == (unsigned int) -1) ||
+	    opcode == MMC_STOP_TRANSMISSION)
+		rawcmd |= (0x1 << 14);
+	else if (opcode == SD_SWITCH_VOLTAGE)
+		rawcmd |= (0x1 << 30);
+	else if (opcode == SD_APP_SEND_SCR ||
+		 opcode == SD_APP_SEND_NUM_WR_BLKS ||
+		 (opcode == SD_SWITCH && mmc_cmd_type(cmd) == MMC_CMD_ADTC) ||
+		 (opcode == SD_APP_SD_STATUS && mmc_cmd_type(cmd) == MMC_CMD_ADTC) ||
+		 (opcode == MMC_SEND_EXT_CSD && mmc_cmd_type(cmd) == MMC_CMD_ADTC))
+		rawcmd |= (0x1 << 11);
+
+	if (cmd->data) {
+		struct mmc_data *data = cmd->data;
+
+		if (mmc_op_multi(opcode)) {
+			if (mmc_card_mmc(host->mmc->card) && mrq->sbc &&
+			    !(mrq->sbc->arg & 0xFFFF0000))
+				rawcmd |= 0x2 << 28; /* AutoCMD23 */
+		}
+
+		rawcmd |= ((data->blksz & 0xFFF) << 16);
+		if (data->flags & MMC_DATA_WRITE)
+			rawcmd |= (0x1 << 13);
+		if (data->blocks > 1)
+			rawcmd |= (0x2 << 11);
+		else
+			rawcmd |= (0x1 << 11);
+		/* Always use dma mode */
+		sdr_clr_bits(host->base + MSDC_CFG, MSDC_CFG_PIO);
+
+		if (host->timeout_ns != data->timeout_ns ||
+		    host->timeout_clks != data->timeout_clks)
+			msdc_set_timeout(host, data->timeout_ns,
+					data->timeout_clks);
+
+		writel(data->blocks, host->base + SDC_BLK_NUM);
+	}
+	return rawcmd;
+}
+
+static void msdc_start_data(struct msdc_host *host, struct mmc_request *mrq,
+			    struct mmc_command *cmd, struct mmc_data *data)
+{
+	bool read;
+
+	WARN_ON(host->data);
+	host->data = data;
+	read = data->flags & MMC_DATA_READ;
+
+	mod_delayed_work(system_wq, &host->req_timeout, DAT_TIMEOUT);
+	msdc_dma_setup(host, &host->dma, data);
+	sdr_set_bits(host->base + MSDC_INTEN, data_ints_mask);
+	sdr_set_field(host->base + MSDC_DMA_CTRL, MSDC_DMA_CTRL_START, 1);
+	dev_dbg(host->dev, "DMA start\n");
+	dev_dbg(host->dev, "%s: cmd=%d DMA data: %d blocks; read=%d\n",
+			__func__, cmd->opcode, data->blocks, read);
+}
+
+static int msdc_auto_cmd_done(struct msdc_host *host, int events,
+		struct mmc_command *cmd)
+{
+	u32 *rsp = cmd->resp;
+
+	rsp[0] = readl(host->base + SDC_ACMD_RESP);
+
+	if (events & MSDC_INT_ACMDRDY) {
+		cmd->error = 0;
+	} else {
+		msdc_reset_hw(host);
+		if (events & MSDC_INT_ACMDCRCERR) {
+			cmd->error = -EILSEQ;
+			host->error |= REQ_STOP_EIO;
+		} else if (events & MSDC_INT_ACMDTMO) {
+			cmd->error = -ETIMEDOUT;
+			host->error |= REQ_STOP_TMO;
+		}
+		dev_err(host->dev,
+			"%s: AUTO_CMD%d arg=%08X; rsp %08X; cmd_error=%d\n",
+			__func__, cmd->opcode, cmd->arg, rsp[0], cmd->error);
+	}
+	return cmd->error;
+}
+
+static void msdc_track_cmd_data(struct msdc_host *host,
+				struct mmc_command *cmd, struct mmc_data *data)
+{
+	if (host->error)
+		dev_dbg(host->dev, "%s: cmd=%d arg=%08X; host->error=0x%08X\n",
+			__func__, cmd->opcode, cmd->arg, host->error);
+}
+
+static void msdc_request_done(struct msdc_host *host, struct mmc_request *mrq)
+{
+	unsigned long flags;
+	bool ret;
+
+	ret = cancel_delayed_work(&host->req_timeout);
+	if (!ret) {
+		/* delay work already running */
+		return;
+	}
+	spin_lock_irqsave(&host->lock, flags);
+	host->mrq = NULL;
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	msdc_track_cmd_data(host, mrq->cmd, mrq->data);
+	if (mrq->data)
+		msdc_unprepare_data(host, mrq);
+	mmc_request_done(host->mmc, mrq);
+}
+
+/* returns true if command is fully handled; returns false otherwise */
+static bool msdc_cmd_done(struct msdc_host *host, int events,
+			  struct mmc_request *mrq, struct mmc_command *cmd)
+{
+	bool done = false;
+	bool sbc_error;
+	unsigned long flags;
+	u32 *rsp = cmd->resp;
+
+	if (mrq->sbc && cmd == mrq->cmd &&
+	    (events & (MSDC_INT_ACMDRDY | MSDC_INT_ACMDCRCERR
+				   | MSDC_INT_ACMDTMO)))
+		msdc_auto_cmd_done(host, events, mrq->sbc);
+
+	sbc_error = mrq->sbc && mrq->sbc->error;
+
+	if (!sbc_error && !(events & (MSDC_INT_CMDRDY
+					| MSDC_INT_RSPCRCERR
+					| MSDC_INT_CMDTMO)))
+		return done;
+
+	spin_lock_irqsave(&host->lock, flags);
+	done = !host->cmd;
+	host->cmd = NULL;
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	if (done)
+		return true;
+
+	sdr_clr_bits(host->base + MSDC_INTEN, MSDC_INTEN_CMDRDY |
+			MSDC_INTEN_RSPCRCERR | MSDC_INTEN_CMDTMO |
+			MSDC_INTEN_ACMDRDY | MSDC_INTEN_ACMDCRCERR |
+			MSDC_INTEN_ACMDTMO);
+	writel(cmd->arg, host->base + SDC_ARG);
+
+	if (cmd->flags & MMC_RSP_PRESENT) {
+		if (cmd->flags & MMC_RSP_136) {
+			rsp[0] = readl(host->base + SDC_RESP3);
+			rsp[1] = readl(host->base + SDC_RESP2);
+			rsp[2] = readl(host->base + SDC_RESP1);
+			rsp[3] = readl(host->base + SDC_RESP0);
+		} else {
+			rsp[0] = readl(host->base + SDC_RESP0);
+		}
+	}
+
+	if (!sbc_error && !(events & MSDC_INT_CMDRDY)) {
+		msdc_reset_hw(host);
+		if (events & MSDC_INT_RSPCRCERR) {
+			cmd->error = -EILSEQ;
+			host->error |= REQ_CMD_EIO;
+		} else if (events & MSDC_INT_CMDTMO) {
+			cmd->error = -ETIMEDOUT;
+			host->error |= REQ_CMD_TMO;
+		}
+	}
+	if (cmd->error)
+		dev_dbg(host->dev,
+				"%s: cmd=%d arg=%08X; rsp %08X; cmd_error=%d\n",
+				__func__, cmd->opcode, cmd->arg, rsp[0],
+				cmd->error);
+
+	msdc_cmd_next(host, mrq, cmd);
+	return true;
+}
+
+/* It is the core layer's responsibility to ensure card status
+ * is correct before issue a request. but host design do below
+ * checks recommended.
+ */
+static inline bool msdc_cmd_is_ready(struct msdc_host *host,
+		struct mmc_request *mrq, struct mmc_command *cmd)
+{
+	/* The max busy time we can endure is 20ms */
+	unsigned long tmo = jiffies + msecs_to_jiffies(20);
+
+	while ((readl(host->base + SDC_STS) & SDC_STS_CMDBUSY) &&
+			time_before(jiffies, tmo))
+		cpu_relax();
+	if (readl(host->base + SDC_STS) & SDC_STS_CMDBUSY) {
+		dev_err(host->dev, "CMD bus busy detected\n");
+		host->error |= REQ_CMD_BUSY;
+		msdc_cmd_done(host, MSDC_INT_CMDTMO, mrq, cmd);
+		return false;
+	}
+
+	if (mmc_resp_type(cmd) == MMC_RSP_R1B || cmd->data) {
+		tmo = jiffies + msecs_to_jiffies(20);
+		/* R1B or with data, should check SDCBUSY */
+		while ((readl(host->base + SDC_STS) & SDC_STS_SDCBUSY) &&
+				time_before(jiffies, tmo))
+			cpu_relax();
+		if (readl(host->base + SDC_STS) & SDC_STS_SDCBUSY) {
+			dev_err(host->dev, "Controller busy detected\n");
+			host->error |= REQ_CMD_BUSY;
+			msdc_cmd_done(host, MSDC_INT_CMDTMO, mrq, cmd);
+			return false;
+		}
+	}
+	return true;
+}
+
+static void msdc_start_command(struct msdc_host *host,
+		struct mmc_request *mrq, struct mmc_command *cmd)
+{
+	u32 rawcmd;
+
+	WARN_ON(host->cmd);
+	host->cmd = cmd;
+
+	if (!msdc_cmd_is_ready(host, mrq, cmd))
+		return;
+
+	if ((readl(host->base + MSDC_FIFOCS) & MSDC_FIFOCS_TXCNT) >> 16 ||
+	    readl(host->base + MSDC_FIFOCS) & MSDC_FIFOCS_RXCNT) {
+		dev_err(host->dev, "TX/RX FIFO non-empty before start of IO. Reset\n");
+		msdc_reset_hw(host);
+	}
+
+	cmd->error = 0;
+	rawcmd = msdc_cmd_prepare_raw_cmd(host, mrq, cmd);
+	mod_delayed_work(system_wq, &host->req_timeout, DAT_TIMEOUT);
+
+	sdr_set_bits(host->base + MSDC_INTEN, MSDC_INTEN_CMDRDY |
+			MSDC_INTEN_RSPCRCERR | MSDC_INTEN_CMDTMO |
+			MSDC_INTEN_ACMDRDY | MSDC_INTEN_ACMDCRCERR |
+			MSDC_INTEN_ACMDTMO);
+	writel(cmd->arg, host->base + SDC_ARG);
+	writel(rawcmd, host->base + SDC_CMD);
+}
+
+static void msdc_cmd_next(struct msdc_host *host,
+		struct mmc_request *mrq, struct mmc_command *cmd)
+{
+	if (cmd->error || (mrq->sbc && mrq->sbc->error))
+		msdc_request_done(host, mrq);
+	else if (cmd == mrq->sbc)
+		msdc_start_command(host, mrq, mrq->cmd);
+	else if (!cmd->data)
+		msdc_request_done(host, mrq);
+	else
+		msdc_start_data(host, mrq, cmd, cmd->data);
+}
+
+static void msdc_ops_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct msdc_host *host = mmc_priv(mmc);
+
+	host->error = 0;
+	WARN_ON(host->mrq);
+	host->mrq = mrq;
+
+	if (mrq->data)
+		msdc_prepare_data(host, mrq);
+
+	/* if SBC is required, we have HW option and SW option.
+	 * if HW option is enabled, and SBC does not have "special" flags,
+	 * use HW option,  otherwise use SW option
+	 */
+	if (mrq->sbc && (!mmc_card_mmc(mmc->card) ||
+	    (mrq->sbc->arg & 0xFFFF0000)))
+		msdc_start_command(host, mrq, mrq->sbc);
+	else
+		msdc_start_command(host, mrq, mrq->cmd);
+}
+
+static void msdc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
+		bool is_first_req)
+{
+	struct msdc_host *host = mmc_priv(mmc);
+	struct mmc_data *data = mrq->data;
+
+	if (!data)
+		return;
+
+	msdc_prepare_data(host, mrq);
+	data->host_cookie |= MSDC_ASYNC_FLAG;
+}
+
+static void msdc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
+		int err)
+{
+	struct msdc_host *host = mmc_priv(mmc);
+	struct mmc_data *data;
+
+	data = mrq->data;
+	if (!data)
+		return;
+	if (data->host_cookie) {
+		data->host_cookie &= ~MSDC_ASYNC_FLAG;
+		msdc_unprepare_data(host, mrq);
+	}
+}
+
+static void msdc_data_xfer_next(struct msdc_host *host,
+				struct mmc_request *mrq, struct mmc_data *data)
+{
+	if (mmc_op_multi(mrq->cmd->opcode) && mrq->stop && !mrq->stop->error &&
+	    (!data->bytes_xfered || !mrq->sbc))
+		msdc_start_command(host, mrq, mrq->stop);
+	else
+		msdc_request_done(host, mrq);
+}
+
+static bool msdc_data_xfer_done(struct msdc_host *host, u32 events,
+				struct mmc_request *mrq, struct mmc_data *data)
+{
+	struct mmc_command *stop = data->stop;
+	unsigned long flags;
+	bool done;
+	unsigned int check_data = events &
+	    (MSDC_INT_XFER_COMPL | MSDC_INT_DATCRCERR | MSDC_INT_DATTMO
+	     | MSDC_INT_DMA_BDCSERR | MSDC_INT_DMA_GPDCSERR
+	     | MSDC_INT_DMA_PROTECT);
+
+	spin_lock_irqsave(&host->lock, flags);
+	done = !host->data;
+	if (check_data)
+		host->data = NULL;
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	if (done)
+		return true;
+
+	if (check_data || (stop && stop->error)) {
+		dev_dbg(host->dev, "DMA status: 0x%8X\n",
+				readl(host->base + MSDC_DMA_CFG));
+		sdr_set_field(host->base + MSDC_DMA_CTRL, MSDC_DMA_CTRL_STOP,
+				1);
+		while (readl(host->base + MSDC_DMA_CFG) & MSDC_DMA_CFG_STS)
+			cpu_relax();
+		sdr_clr_bits(host->base + MSDC_INTEN, data_ints_mask);
+		dev_dbg(host->dev, "DMA stop\n");
+
+		if ((events & MSDC_INT_XFER_COMPL) && (!stop || !stop->error)) {
+			data->bytes_xfered = data->blocks * data->blksz;
+		} else {
+			dev_err(host->dev, "interrupt events: %x\n", events);
+			msdc_reset_hw(host);
+			host->error |= REQ_DAT_ERR;
+			data->bytes_xfered = 0;
+
+			if (events & MSDC_INT_DATTMO)
+				data->error = -ETIMEDOUT;
+
+			dev_err(host->dev, "%s: cmd=%d; blocks=%d",
+				__func__, mrq->cmd->opcode, data->blocks);
+			dev_err(host->dev, "data_error=%d xfer_size=%d\n",
+					(int)data->error, data->bytes_xfered);
+		}
+
+		msdc_data_xfer_next(host, mrq, data);
+		done = true;
+	}
+	return done;
+}
+
+static void msdc_set_buswidth(struct msdc_host *host, u32 width)
+{
+	u32 val = readl(host->base + SDC_CFG);
+
+	val &= ~SDC_CFG_BUSWIDTH;
+
+	switch (width) {
+	default:
+	case MMC_BUS_WIDTH_1:
+		val |= (MSDC_BUS_1BITS << 16);
+		break;
+	case MMC_BUS_WIDTH_4:
+		val |= (MSDC_BUS_4BITS << 16);
+		break;
+	case MMC_BUS_WIDTH_8:
+		val |= (MSDC_BUS_8BITS << 16);
+		break;
+	}
+
+	writel(val, host->base + SDC_CFG);
+	dev_dbg(host->dev, "Bus Width = %d", width);
+}
+
+static int msdc_ops_switch_volt(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct msdc_host *host = mmc_priv(mmc);
+	int min_uv, max_uv;
+	int ret = 0;
+
+	if (!IS_ERR(mmc->supply.vqmmc)) {
+		if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
+			min_uv = 3300000;
+			max_uv = 3300000;
+		} else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
+			min_uv = 1800000;
+			max_uv = 1800000;
+		} else {
+			dev_err(host->dev, "Unsupported signal voltage!\n");
+			return -EINVAL;
+		}
+
+		ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
+		if (ret) {
+			dev_err(host->dev,
+					"Regulator set error %d: %d - %d\n",
+					ret, min_uv, max_uv);
+		} else {
+			/* Apply different pinctrl settings for different signal voltage */
+			if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180)
+				pinctrl_select_state(host->pinctrl, host->pins_uhs);
+			else
+				pinctrl_select_state(host->pinctrl, host->pins_default);
+		}
+	}
+	return ret;
+}
+
+static int msdc_card_busy(struct mmc_host *mmc)
+{
+	struct msdc_host *host = mmc_priv(mmc);
+	u32 status = readl(host->base + MSDC_PS);
+
+	/* check if any pin between dat[0:3] is low */
+	if (((status >> 16) & 0xf) != 0xf)
+		return 1;
+
+	return 0;
+}
+
+static void msdc_request_timeout(struct work_struct *work)
+{
+	struct msdc_host *host = container_of(work, struct msdc_host,
+			req_timeout.work);
+
+	/* simulate HW timeout status */
+	dev_err(host->dev, "%s: aborting cmd/data/mrq\n", __func__);
+	if (host->mrq) {
+		dev_err(host->dev, "%s: aborting mrq=%p cmd=%d\n", __func__,
+				host->mrq, host->mrq->cmd->opcode);
+		if (host->cmd) {
+			dev_err(host->dev, "%s: aborting cmd=%d\n",
+					__func__, host->cmd->opcode);
+			msdc_cmd_done(host, MSDC_INT_CMDTMO, host->mrq,
+					host->cmd);
+		} else if (host->data) {
+			dev_err(host->dev, "%s: abort data: cmd%d; %d blocks\n",
+					__func__, host->mrq->cmd->opcode,
+					host->data->blocks);
+			msdc_data_xfer_done(host, MSDC_INT_DATTMO, host->mrq,
+					host->data);
+		}
+	}
+}
+
+static irqreturn_t msdc_irq(int irq, void *dev_id)
+{
+	struct msdc_host *host = (struct msdc_host *) dev_id;
+
+	while (true) {
+		unsigned long flags;
+		struct mmc_request *mrq;
+		struct mmc_command *cmd;
+		struct mmc_data *data;
+		u32 events, event_mask;
+
+		spin_lock_irqsave(&host->lock, flags);
+		events = readl(host->base + MSDC_INT);
+		event_mask = readl(host->base + MSDC_INTEN);
+		/* clear interrupts */
+		writel(events & event_mask, host->base + MSDC_INT);
+
+		mrq = host->mrq;
+		cmd = host->cmd;
+		data = host->data;
+		spin_unlock_irqrestore(&host->lock, flags);
+
+		if (!(events & event_mask))
+			break;
+
+		if (!mrq) {
+			dev_err(host->dev,
+				"%s: MRQ=NULL; events=%08X; event_mask=%08X\n",
+				__func__, events, event_mask);
+			WARN_ON(1);
+			break;
+		}
+
+		dev_dbg(host->dev, "%s: events=%08X\n", __func__, events);
+
+		if (cmd)
+			msdc_cmd_done(host, events, mrq, cmd);
+		else if (data)
+			msdc_data_xfer_done(host, events, mrq, data);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void msdc_init_hw(struct msdc_host *host)
+{
+	u32 val;
+
+	/* Configure to MMC/SD mode, clock free running */
+	sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_MODE | MSDC_CFG_CKPDN);
+
+	/* Reset */
+	msdc_reset_hw(host);
+
+	/* Disable card detection */
+	sdr_clr_bits(host->base + MSDC_PS, MSDC_PS_CDEN);
+
+	/* Disable and clear all interrupts */
+	writel(0, host->base + MSDC_INTEN);
+	val = readl(host->base + MSDC_INT);
+	writel(val, host->base + MSDC_INT);
+
+	writel(0, host->base + MSDC_PAD_TUNE);
+	writel(0, host->base + MSDC_IOCON);
+	sdr_set_field(host->base + MSDC_IOCON, MSDC_IOCON_DDLSEL, 1);
+	writel(0x403c004f, host->base + MSDC_PATCH_BIT);
+	sdr_set_field(host->base + MSDC_PATCH_BIT, MSDC_CKGEN_MSDC_DLY_SEL, 1);
+	writel(0xffff0089, host->base + MSDC_PATCH_BIT1);
+	/* Configure to enable SDIO mode.
+	 * it's must otherwise sdio cmd5 failed
+	 */
+	sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIO);
+
+	/* disable detect SDIO device interrupt function */
+	sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
+
+	/* Configure to default data timeout */
+	sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, 3);
+
+	dev_dbg(host->dev, "init hardware done!");
+}
+
+static void msdc_deinit_hw(struct msdc_host *host)
+{
+	u32 val;
+	/* Disable and clear all interrupts */
+	writel(0, host->base + MSDC_INTEN);
+
+	val = readl(host->base + MSDC_INT);
+	writel(val, host->base + MSDC_INT);
+}
+
+/* init gpd and bd list in msdc_drv_probe */
+static void msdc_init_gpd_bd(struct msdc_host *host, struct msdc_dma *dma)
+{
+	struct mt_gpdma_desc *gpd = dma->gpd;
+	struct mt_bdma_desc *bd = dma->bd;
+	int i;
+
+	memset(gpd, 0, sizeof(struct mt_gpdma_desc));
+
+	gpd->gpd_info = GPDMA_DESC_BDP; /* hwo, cs, bd pointer */
+	gpd->ptr = (u32)dma->bd_addr; /* physical address */
+
+	memset(bd, 0, sizeof(struct mt_bdma_desc) * MAX_BD_NUM);
+	for (i = 0; i < (MAX_BD_NUM - 1); i++)
+		bd[i].next = (u32)dma->bd_addr + sizeof(*bd) * (i + 1);
+}
+
+static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct msdc_host *host = mmc_priv(mmc);
+	int ret;
+	u32 ddr = 0;
+
+	if (ios->timing == MMC_TIMING_UHS_DDR50 ||
+	    ios->timing == MMC_TIMING_MMC_DDR52)
+		ddr = 1;
+
+	msdc_set_buswidth(host, ios->bus_width);
+
+	/* Suspend/Resume will do power off/on */
+	switch (ios->power_mode) {
+	case MMC_POWER_UP:
+		if (!IS_ERR(mmc->supply.vmmc)) {
+			ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
+					ios->vdd);
+			if (ret) {
+				dev_err(host->dev, "Failed to set vmmc power!\n");
+				return;
+			}
+		}
+		break;
+	case MMC_POWER_ON:
+		if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
+			ret = regulator_enable(mmc->supply.vqmmc);
+			if (ret)
+				dev_err(host->dev, "Failed to set vqmmc power!\n");
+			else
+				host->vqmmc_enabled = true;
+		}
+		break;
+	case MMC_POWER_OFF:
+		if (!IS_ERR(mmc->supply.vmmc))
+			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
+
+		if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) {
+			regulator_disable(mmc->supply.vqmmc);
+			host->vqmmc_enabled = false;
+		}
+		break;
+	default:
+		break;
+	}
+
+	if (host->mclk != ios->clock || host->ddr != ddr)
+		msdc_set_mclk(host, ddr, ios->clock);
+}
+
+static struct mmc_host_ops mt_msdc_ops = {
+	.post_req = msdc_post_req,
+	.pre_req = msdc_pre_req,
+	.request = msdc_ops_request,
+	.set_ios = msdc_ops_set_ios,
+	.start_signal_voltage_switch = msdc_ops_switch_volt,
+	.card_busy = msdc_card_busy,
+};
+
+static int msdc_drv_probe(struct platform_device *pdev)
+{
+	struct mmc_host *mmc;
+	struct msdc_host *host;
+	struct resource *res;
+	int ret;
+
+	if (!pdev->dev.of_node) {
+		dev_err(&pdev->dev, "No DT found\n");
+		return -EINVAL;
+	}
+	/* Allocate MMC host for this device */
+	mmc = mmc_alloc_host(sizeof(struct msdc_host), &pdev->dev);
+	if (!mmc)
+		return -ENOMEM;
+
+	host = mmc_priv(mmc);
+	ret = mmc_of_parse(mmc);
+	if (ret)
+		goto host_free;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	host->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(host->base)) {
+		ret = PTR_ERR(host->base);
+		goto host_free;
+	}
+
+	ret = mmc_regulator_get_supply(mmc);
+	if (ret == -EPROBE_DEFER)
+		goto host_free;
+
+	host->src_clk = devm_clk_get(&pdev->dev, "source");
+	if (IS_ERR(host->src_clk)) {
+		ret = PTR_ERR(host->src_clk);
+		goto host_free;
+	}
+
+	host->h_clk = devm_clk_get(&pdev->dev, "hclk");
+	if (IS_ERR(host->h_clk)) {
+		ret = PTR_ERR(host->h_clk);
+		goto host_free;
+	}
+
+	host->irq = platform_get_irq(pdev, 0);
+	if (host->irq < 0) {
+		ret = -EINVAL;
+		goto host_free;
+	}
+
+	host->pinctrl = devm_pinctrl_get(&pdev->dev);
+	if (IS_ERR(host->pinctrl)) {
+		ret = PTR_ERR(host->pinctrl);
+		dev_err(&pdev->dev, "Cannot find pinctrl!\n");
+		goto host_free;
+	}
+
+	host->pins_default = pinctrl_lookup_state(host->pinctrl, "default");
+	if (IS_ERR(host->pins_default)) {
+		ret = PTR_ERR(host->pins_default);
+		dev_err(&pdev->dev, "Cannot find pinctrl default!\n");
+		goto host_free;
+	}
+
+	host->pins_uhs = pinctrl_lookup_state(host->pinctrl, "state_uhs");
+	if (IS_ERR(host->pins_uhs)) {
+		ret = PTR_ERR(host->pins_uhs);
+		dev_err(&pdev->dev, "Cannot find pinctrl uhs!\n");
+		goto host_free;
+	}
+
+	host->dev = &pdev->dev;
+	host->mmc = mmc;
+	host->src_clk_freq = clk_get_rate(host->src_clk);
+	/* Set host parameters to mmc */
+	mmc->ops = &mt_msdc_ops;
+	mmc->f_min = host->src_clk_freq / (4 * 255);
+
+	mmc->caps |= MMC_CAP_ERASE | MMC_CAP_CMD23;
+	/* MMC core transfer sizes tunable parameters */
+	mmc->max_segs = MAX_BD_NUM;
+	mmc->max_seg_size = BDMA_DESC_BUFLEN;
+	mmc->max_blk_size = 2048;
+	mmc->max_req_size = 512 * 1024;
+	mmc->max_blk_count = mmc->max_req_size / 512;
+	host->dma_mask = DMA_BIT_MASK(32);
+	mmc_dev(mmc)->dma_mask = &host->dma_mask;
+
+	host->timeout_clks = 3 * 1048576;
+	host->dma.gpd = dma_alloc_coherent(&pdev->dev,
+				sizeof(struct mt_gpdma_desc),
+				&host->dma.gpd_addr, GFP_KERNEL);
+	host->dma.bd = dma_alloc_coherent(&pdev->dev,
+				MAX_BD_NUM * sizeof(struct mt_bdma_desc),
+				&host->dma.bd_addr, GFP_KERNEL);
+	if (!host->dma.gpd || !host->dma.bd) {
+		ret = -ENOMEM;
+		goto release_mem;
+	}
+	msdc_init_gpd_bd(host, &host->dma);
+	INIT_DELAYED_WORK(&host->req_timeout, msdc_request_timeout);
+	spin_lock_init(&host->lock);
+
+	platform_set_drvdata(pdev, mmc);
+	msdc_ungate_clock(host);
+	msdc_init_hw(host);
+
+	ret = devm_request_irq(&pdev->dev, host->irq, msdc_irq,
+		IRQF_TRIGGER_LOW | IRQF_ONESHOT, pdev->name, host);
+	if (ret)
+		goto release;
+
+	ret = mmc_add_host(mmc);
+	if (ret)
+		goto release;
+
+	return 0;
+
+release:
+	platform_set_drvdata(pdev, NULL);
+	msdc_deinit_hw(host);
+	msdc_gate_clock(host);
+release_mem:
+	if (host->dma.gpd)
+		dma_free_coherent(&pdev->dev,
+			sizeof(struct mt_gpdma_desc),
+			host->dma.gpd, host->dma.gpd_addr);
+	if (host->dma.bd)
+		dma_free_coherent(&pdev->dev,
+			MAX_BD_NUM * sizeof(struct mt_bdma_desc),
+			host->dma.bd, host->dma.bd_addr);
+host_free:
+	mmc_free_host(mmc);
+
+	return ret;
+}
+
+static int msdc_drv_remove(struct platform_device *pdev)
+{
+	struct mmc_host *mmc;
+	struct msdc_host *host;
+
+	mmc = platform_get_drvdata(pdev);
+	host = mmc_priv(mmc);
+
+	platform_set_drvdata(pdev, NULL);
+	mmc_remove_host(host->mmc);
+	msdc_deinit_hw(host);
+	msdc_gate_clock(host);
+
+	dma_free_coherent(&pdev->dev,
+			sizeof(struct mt_gpdma_desc),
+			host->dma.gpd, host->dma.gpd_addr);
+	dma_free_coherent(&pdev->dev, MAX_BD_NUM * sizeof(struct mt_bdma_desc),
+			host->dma.bd, host->dma.bd_addr);
+
+	mmc_free_host(host->mmc);
+
+	return 0;
+}
+
+static const struct of_device_id msdc_of_ids[] = {
+	{   .compatible = "mediatek,mt8135-mmc", },
+	{}
+};
+
+static struct platform_driver mt_msdc_driver = {
+	.probe = msdc_drv_probe,
+	.remove = msdc_drv_remove,
+	.driver = {
+		.name = "mtk-msdc",
+		.of_match_table = msdc_of_ids,
+	},
+};
+
+module_platform_driver(mt_msdc_driver);
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MediaTek SD/MMC Card Driver");

include/linux/mmc/core.h

@@ -121,6 +121,7 @@ struct mmc_data {
 	struct mmc_request	*mrq;		/* associated request */
 
 	unsigned int		sg_len;		/* size of scatter list */
+	int			sg_count;	/* mapped sg entries */
 	struct scatterlist	*sg;		/* I/O scatter list */
 	s32			host_cookie;	/* host private data */
 };