drivers/mmc/tmio-common.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2016 Socionext Inc.
  *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
  */

 #include <common.h>
 #include <clk.h>
 #include <fdtdec.h>
 #include <mmc.h>
 #include <dm.h>
 #include <dm/pinctrl.h>
 #include <linux/compat.h>
 #include <linux/dma-direction.h>
 #include <linux/io.h>
 #include <linux/sizes.h>
 #include <power/regulator.h>
 #include <asm/unaligned.h>

 #include "tmio-common.h"

 DECLARE_GLOBAL_DATA_PTR;

 static u64 tmio_sd_readq(struct tmio_sd_priv *priv, unsigned int reg)
 {
 	return readq(priv->regbase + (reg << 1));
 }

 static void tmio_sd_writeq(struct tmio_sd_priv *priv,
 			       u64 val, unsigned int reg)
 {
 	writeq(val, priv->regbase + (reg << 1));
 }

 static u16 tmio_sd_readw(struct tmio_sd_priv *priv, unsigned int reg)
 {
 	return readw(priv->regbase + (reg >> 1));
 }

 static void tmio_sd_writew(struct tmio_sd_priv *priv,
 			       u16 val, unsigned int reg)
 {
 	writew(val, priv->regbase + (reg >> 1));
 }

 u32 tmio_sd_readl(struct tmio_sd_priv *priv, unsigned int reg)
 {
 	u32 val;

 	if (priv->caps & TMIO_SD_CAP_64BIT)
 		return readl(priv->regbase + (reg << 1));
 	else if (priv->caps & TMIO_SD_CAP_16BIT) {
 		val = readw(priv->regbase + (reg >> 1)) & 0xffff;
 		if ((reg == TMIO_SD_RSP10) || (reg == TMIO_SD_RSP32) ||
 		    (reg == TMIO_SD_RSP54) || (reg == TMIO_SD_RSP76)) {
 			val |= readw(priv->regbase + (reg >> 1) + 2) << 16;
 		}
 		return val;
 	} else
 		return readl(priv->regbase + reg);
 }

 void tmio_sd_writel(struct tmio_sd_priv *priv,
 			       u32 val, unsigned int reg)
 {
 	if (priv->caps & TMIO_SD_CAP_64BIT)
 		writel(val, priv->regbase + (reg << 1));
 	else if (priv->caps & TMIO_SD_CAP_16BIT) {
 		writew(val & 0xffff, priv->regbase + (reg >> 1));
 		if (reg == TMIO_SD_INFO1 || reg == TMIO_SD_INFO1_MASK ||
 		    reg == TMIO_SD_INFO2 || reg == TMIO_SD_INFO2_MASK ||
 		    reg == TMIO_SD_ARG)
 			writew(val >> 16, priv->regbase + (reg >> 1) + 2);
 	} else
 		writel(val, priv->regbase + reg);
 }

 static dma_addr_t __dma_map_single(void *ptr, size_t size,
 				   enum dma_data_direction dir)
 {
 	unsigned long addr = (unsigned long)ptr;

 	if (dir == DMA_FROM_DEVICE)
 		invalidate_dcache_range(addr, addr + size);
 	else
 		flush_dcache_range(addr, addr + size);

 	return addr;
 }

 static void __dma_unmap_single(dma_addr_t addr, size_t size,
 			       enum dma_data_direction dir)
 {
 	if (dir != DMA_TO_DEVICE)
 		invalidate_dcache_range(addr, addr + size);
 }

 static int tmio_sd_check_error(struct udevice *dev)
 {
 	struct tmio_sd_priv *priv = dev_get_priv(dev);
 	u32 info2 = tmio_sd_readl(priv, TMIO_SD_INFO2);

 	if (info2 & TMIO_SD_INFO2_ERR_RTO) {
 		/*
 		 * TIMEOUT must be returned for unsupported command.  Do not
 		 * display error log since this might be a part of sequence to
 		 * distinguish between SD and MMC.
 		 */
 		return -ETIMEDOUT;
 	}

 	if (info2 & TMIO_SD_INFO2_ERR_TO) {
 		dev_err(dev, "timeout error\n");
 		return -ETIMEDOUT;
 	}

 	if (info2 & (TMIO_SD_INFO2_ERR_END | TMIO_SD_INFO2_ERR_CRC |
 		     TMIO_SD_INFO2_ERR_IDX)) {
 		dev_err(dev, "communication out of sync\n");
 		return -EILSEQ;
 	}

 	if (info2 & (TMIO_SD_INFO2_ERR_ILA | TMIO_SD_INFO2_ERR_ILR |
 		     TMIO_SD_INFO2_ERR_ILW)) {
 		dev_err(dev, "illegal access\n");
 		return -EIO;
 	}

 	return 0;
 }

 static int tmio_sd_wait_for_irq(struct udevice *dev, unsigned int reg,
 				    u32 flag)
 {
 	struct tmio_sd_priv *priv = dev_get_priv(dev);
 	long wait = 1000000;
 	int ret;

 	while (!(tmio_sd_readl(priv, reg) & flag)) {
 		if (wait-- < 0) {
 			dev_err(dev, "timeout\n");
 			return -ETIMEDOUT;
 		}

 		ret = tmio_sd_check_error(dev);
 		if (ret)
 			return ret;

 		udelay(1);
 	}

 	return 0;
 }

 #define tmio_pio_read_fifo(__width, __suffix)				\
 static void tmio_pio_read_fifo_##__width(struct tmio_sd_priv *priv,	\
 					  char *pbuf, uint blksz)	\
 {									\
 	u##__width *buf = (u##__width *)pbuf;				\
 	int i;								\
 									\
 	if (likely(IS_ALIGNED((uintptr_t)buf, ((__width) / 8)))) {	\
 		for (i = 0; i < blksz / ((__width) / 8); i++) {		\
 			*buf++ = tmio_sd_read##__suffix(priv,		\
 							 TMIO_SD_BUF);	\
 		}							\
 	} else {							\
 		for (i = 0; i < blksz / ((__width) / 8); i++) {		\
 			u##__width data;				\
 			data = tmio_sd_read##__suffix(priv,		\
 						       TMIO_SD_BUF);	\
 			put_unaligned(data, buf++);			\
 		}							\
 	}								\
 }

 tmio_pio_read_fifo(64, q)
 tmio_pio_read_fifo(32, l)
 tmio_pio_read_fifo(16, w)

 static int tmio_sd_pio_read_one_block(struct udevice *dev, char *pbuf,
 					  uint blocksize)
 {
 	struct tmio_sd_priv *priv = dev_get_priv(dev);
 	int ret;

 	/* wait until the buffer is filled with data */
 	ret = tmio_sd_wait_for_irq(dev, TMIO_SD_INFO2,
 				       TMIO_SD_INFO2_BRE);
 	if (ret)
 		return ret;

 	/*
 	 * Clear the status flag _before_ read the buffer out because
 	 * TMIO_SD_INFO2_BRE is edge-triggered, not level-triggered.
 	 */
 	tmio_sd_writel(priv, 0, TMIO_SD_INFO2);

 	if (priv->caps & TMIO_SD_CAP_64BIT)
 		tmio_pio_read_fifo_64(priv, pbuf, blocksize);
 	else if (priv->caps & TMIO_SD_CAP_16BIT)
 		tmio_pio_read_fifo_16(priv, pbuf, blocksize);
 	else
 		tmio_pio_read_fifo_32(priv, pbuf, blocksize);

 	return 0;
 }

 #define tmio_pio_write_fifo(__width, __suffix)				\
 static void tmio_pio_write_fifo_##__width(struct tmio_sd_priv *priv,	\
 					   const char *pbuf, uint blksz)\
 {									\
 	const u##__width *buf = (const u##__width *)pbuf;		\
 	int i;								\
 									\
 	if (likely(IS_ALIGNED((uintptr_t)buf, ((__width) / 8)))) {	\
 		for (i = 0; i < blksz / ((__width) / 8); i++) {		\
 			tmio_sd_write##__suffix(priv, *buf++,		\
 						 TMIO_SD_BUF);		\
 		}							\
 	} else {							\
 		for (i = 0; i < blksz / ((__width) / 8); i++) {		\
 			u##__width data = get_unaligned(buf++);		\
 			tmio_sd_write##__suffix(priv, data,		\
 						 TMIO_SD_BUF);		\
 		}							\
 	}								\
 }

 tmio_pio_write_fifo(64, q)
 tmio_pio_write_fifo(32, l)
 tmio_pio_write_fifo(16, w)

 static int tmio_sd_pio_write_one_block(struct udevice *dev,
 					   const char *pbuf, uint blocksize)
 {
 	struct tmio_sd_priv *priv = dev_get_priv(dev);
 	int ret;

 	/* wait until the buffer becomes empty */
 	ret = tmio_sd_wait_for_irq(dev, TMIO_SD_INFO2,
 				    TMIO_SD_INFO2_BWE);
 	if (ret)
 		return ret;

 	tmio_sd_writel(priv, 0, TMIO_SD_INFO2);

 	if (priv->caps & TMIO_SD_CAP_64BIT)
 		tmio_pio_write_fifo_64(priv, pbuf, blocksize);
 	else if (priv->caps & TMIO_SD_CAP_16BIT)
 		tmio_pio_write_fifo_16(priv, pbuf, blocksize);
 	else
 		tmio_pio_write_fifo_32(priv, pbuf, blocksize);

 	return 0;
 }

 static int tmio_sd_pio_xfer(struct udevice *dev, struct mmc_data *data)
 {
 	const char *src = data->src;
 	char *dest = data->dest;
 	int i, ret;

 	for (i = 0; i < data->blocks; i++) {
 		if (data->flags & MMC_DATA_READ)
 			ret = tmio_sd_pio_read_one_block(dev, dest,
 							     data->blocksize);
 		else
 			ret = tmio_sd_pio_write_one_block(dev, src,
 							      data->blocksize);
 		if (ret)
 			return ret;

 		if (data->flags & MMC_DATA_READ)
 			dest += data->blocksize;
 		else
 			src += data->blocksize;
 	}

 	return 0;
 }

 static void tmio_sd_dma_start(struct tmio_sd_priv *priv,
 				  dma_addr_t dma_addr)
 {
 	u32 tmp;

 	tmio_sd_writel(priv, 0, TMIO_SD_DMA_INFO1);
 	tmio_sd_writel(priv, 0, TMIO_SD_DMA_INFO2);

 	/* enable DMA */
 	tmp = tmio_sd_readl(priv, TMIO_SD_EXTMODE);
 	tmp |= TMIO_SD_EXTMODE_DMA_EN;
 	tmio_sd_writel(priv, tmp, TMIO_SD_EXTMODE);

 	tmio_sd_writel(priv, dma_addr & U32_MAX, TMIO_SD_DMA_ADDR_L);

 	/* suppress the warning "right shift count >= width of type" */
 	dma_addr >>= min_t(int, 32, 8 * sizeof(dma_addr));

 	tmio_sd_writel(priv, dma_addr & U32_MAX, TMIO_SD_DMA_ADDR_H);

 	tmio_sd_writel(priv, TMIO_SD_DMA_CTL_START, TMIO_SD_DMA_CTL);
 }

 static int tmio_sd_dma_wait_for_irq(struct udevice *dev, u32 flag,
 					unsigned int blocks)
 {
 	struct tmio_sd_priv *priv = dev_get_priv(dev);
 	long wait = 1000000 + 10 * blocks;

 	while (!(tmio_sd_readl(priv, TMIO_SD_DMA_INFO1) & flag)) {
 		if (wait-- < 0) {
 			dev_err(dev, "timeout during DMA\n");
 			return -ETIMEDOUT;
 		}

 		udelay(10);
 	}

 	if (tmio_sd_readl(priv, TMIO_SD_DMA_INFO2)) {
 		dev_err(dev, "error during DMA\n");
 		return -EIO;
 	}

 	return 0;
 }

 static int tmio_sd_dma_xfer(struct udevice *dev, struct mmc_data *data)
 {
 	struct tmio_sd_priv *priv = dev_get_priv(dev);
 	size_t len = data->blocks * data->blocksize;
 	void *buf;
 	enum dma_data_direction dir;
 	dma_addr_t dma_addr;
 	u32 poll_flag, tmp;
 	int ret;

 	tmp = tmio_sd_readl(priv, TMIO_SD_DMA_MODE);

 	if (data->flags & MMC_DATA_READ) {
 		buf = data->dest;
 		dir = DMA_FROM_DEVICE;
 		/*
 		 * The DMA READ completion flag position differs on Socionext
 		 * and Renesas SoCs. It is bit 20 on Socionext SoCs and using
 		 * bit 17 is a hardware bug and forbidden. It is bit 17 on
 		 * Renesas SoCs and bit 20 does not work on them.
 		 */
 		poll_flag = (priv->caps & TMIO_SD_CAP_RCAR) ?
 			    TMIO_SD_DMA_INFO1_END_RD :
 			    TMIO_SD_DMA_INFO1_END_RD2;
 		tmp |= TMIO_SD_DMA_MODE_DIR_RD;
 	} else {
 		buf = (void *)data->src;
 		dir = DMA_TO_DEVICE;
 		poll_flag = TMIO_SD_DMA_INFO1_END_WR;
 		tmp &= ~TMIO_SD_DMA_MODE_DIR_RD;
 	}

 	tmio_sd_writel(priv, tmp, TMIO_SD_DMA_MODE);

 	dma_addr = __dma_map_single(buf, len, dir);

 	tmio_sd_dma_start(priv, dma_addr);

 	ret = tmio_sd_dma_wait_for_irq(dev, poll_flag, data->blocks);

 	__dma_unmap_single(dma_addr, len, dir);

 	return ret;
 }

 /* check if the address is DMA'able */
 static bool tmio_sd_addr_is_dmaable(const char *src)
 {
 	uintptr_t addr = (uintptr_t)src;

 	if (!IS_ALIGNED(addr, TMIO_SD_DMA_MINALIGN))
 		return false;

 #if defined(CONFIG_RCAR_GEN3)
 	/* Gen3 DMA has 32bit limit */
 	if (addr >> 32)
 		return false;
 #endif

 #if defined(CONFIG_ARCH_UNIPHIER) && !defined(CONFIG_ARM64) && \
 	defined(CONFIG_SPL_BUILD)
 	/*
 	 * For UniPhier ARMv7 SoCs, the stack is allocated in the locked ways
 	 * of L2, which is unreachable from the DMA engine.
 	 */
 	if (addr < CONFIG_SPL_STACK)
 		return false;
 #endif

 	return true;
 }

 int tmio_sd_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
 		      struct mmc_data *data)
 {
 	struct tmio_sd_priv *priv = dev_get_priv(dev);
 	int ret;
 	u32 tmp;

 	if (tmio_sd_readl(priv, TMIO_SD_INFO2) & TMIO_SD_INFO2_CBSY) {
 		dev_err(dev, "command busy\n");
 		return -EBUSY;
 	}

 	/* clear all status flags */
 	tmio_sd_writel(priv, 0, TMIO_SD_INFO1);
 	tmio_sd_writel(priv, 0, TMIO_SD_INFO2);

 	/* disable DMA once */
 	tmp = tmio_sd_readl(priv, TMIO_SD_EXTMODE);
 	tmp &= ~TMIO_SD_EXTMODE_DMA_EN;
 	tmio_sd_writel(priv, tmp, TMIO_SD_EXTMODE);

 	tmio_sd_writel(priv, cmd->cmdarg, TMIO_SD_ARG);

 	tmp = cmd->cmdidx;

 	if (data) {
 		tmio_sd_writel(priv, data->blocksize, TMIO_SD_SIZE);
 		tmio_sd_writel(priv, data->blocks, TMIO_SD_SECCNT);

 		/* Do not send CMD12 automatically */
 		tmp |= TMIO_SD_CMD_NOSTOP | TMIO_SD_CMD_DATA;

 		if (data->blocks > 1)
 			tmp |= TMIO_SD_CMD_MULTI;

 		if (data->flags & MMC_DATA_READ)
 			tmp |= TMIO_SD_CMD_RD;
 	}

 	/*
 	 * Do not use the response type auto-detection on this hardware.
 	 * CMD8, for example, has different response types on SD and eMMC,
 	 * while this controller always assumes the response type for SD.
 	 * Set the response type manually.
 	 */
 	switch (cmd->resp_type) {
 	case MMC_RSP_NONE:
 		tmp |= TMIO_SD_CMD_RSP_NONE;
 		break;
 	case MMC_RSP_R1:
 		tmp |= TMIO_SD_CMD_RSP_R1;
 		break;
 	case MMC_RSP_R1b:
 		tmp |= TMIO_SD_CMD_RSP_R1B;
 		break;
 	case MMC_RSP_R2:
 		tmp |= TMIO_SD_CMD_RSP_R2;
 		break;
 	case MMC_RSP_R3:
 		tmp |= TMIO_SD_CMD_RSP_R3;
 		break;
 	default:
 		dev_err(dev, "unknown response type\n");
 		return -EINVAL;
 	}

 	dev_dbg(dev, "sending CMD%d (SD_CMD=%08x, SD_ARG=%08x)\n",
 		cmd->cmdidx, tmp, cmd->cmdarg);
 	tmio_sd_writel(priv, tmp, TMIO_SD_CMD);

 	ret = tmio_sd_wait_for_irq(dev, TMIO_SD_INFO1,
 				       TMIO_SD_INFO1_RSP);
 	if (ret)
 		return ret;

 	if (cmd->resp_type & MMC_RSP_136) {
 		u32 rsp_127_104 = tmio_sd_readl(priv, TMIO_SD_RSP76);
 		u32 rsp_103_72 = tmio_sd_readl(priv, TMIO_SD_RSP54);
 		u32 rsp_71_40 = tmio_sd_readl(priv, TMIO_SD_RSP32);
 		u32 rsp_39_8 = tmio_sd_readl(priv, TMIO_SD_RSP10);

 		cmd->response[0] = ((rsp_127_104 & 0x00ffffff) << 8) |
 				   ((rsp_103_72  & 0xff000000) >> 24);
 		cmd->response[1] = ((rsp_103_72  & 0x00ffffff) << 8) |
 				   ((rsp_71_40   & 0xff000000) >> 24);
 		cmd->response[2] = ((rsp_71_40   & 0x00ffffff) << 8) |
 				   ((rsp_39_8    & 0xff000000) >> 24);
 		cmd->response[3] = (rsp_39_8     & 0xffffff)   << 8;
 	} else {
 		/* bit 39-8 */
 		cmd->response[0] = tmio_sd_readl(priv, TMIO_SD_RSP10);
 	}

 	if (data) {
 		/* use DMA if the HW supports it and the buffer is aligned */
 		if (priv->caps & TMIO_SD_CAP_DMA_INTERNAL &&
 		    tmio_sd_addr_is_dmaable(data->src))
 			ret = tmio_sd_dma_xfer(dev, data);
 		else
 			ret = tmio_sd_pio_xfer(dev, data);

 		ret = tmio_sd_wait_for_irq(dev, TMIO_SD_INFO1,
 					       TMIO_SD_INFO1_CMP);
 		if (ret)
 			return ret;
 	}

 	tmio_sd_wait_for_irq(dev, TMIO_SD_INFO2, TMIO_SD_INFO2_SCLKDIVEN);

 	return ret;
 }

 static int tmio_sd_set_bus_width(struct tmio_sd_priv *priv,
 				     struct mmc *mmc)
 {
 	u32 val, tmp;

 	switch (mmc->bus_width) {
 	case 0:
 	case 1:
 		val = TMIO_SD_OPTION_WIDTH_1;
 		break;
 	case 4:
 		val = TMIO_SD_OPTION_WIDTH_4;
 		break;
 	case 8:
 		val = TMIO_SD_OPTION_WIDTH_8;
 		break;
 	default:
 		return -EINVAL;
 	}

 	tmp = tmio_sd_readl(priv, TMIO_SD_OPTION);
 	tmp &= ~TMIO_SD_OPTION_WIDTH_MASK;
 	tmp |= val;
 	tmio_sd_writel(priv, tmp, TMIO_SD_OPTION);

 	return 0;
 }

 static void tmio_sd_set_ddr_mode(struct tmio_sd_priv *priv,
 				     struct mmc *mmc)
 {
 	u32 tmp;

 	tmp = tmio_sd_readl(priv, TMIO_SD_IF_MODE);
 	if (mmc->ddr_mode)
 		tmp |= TMIO_SD_IF_MODE_DDR;
 	else
 		tmp &= ~TMIO_SD_IF_MODE_DDR;
 	tmio_sd_writel(priv, tmp, TMIO_SD_IF_MODE);
 }

 static void tmio_sd_set_clk_rate(struct tmio_sd_priv *priv,
 				     struct mmc *mmc)
 {
 	unsigned int divisor;
 	u32 val, tmp;

 	if (!mmc->clock)
 		return;

 	divisor = DIV_ROUND_UP(priv->mclk, mmc->clock);

 	if (divisor <= 1)
 		val = (priv->caps & TMIO_SD_CAP_RCAR) ?
 		      TMIO_SD_CLKCTL_RCAR_DIV1 : TMIO_SD_CLKCTL_DIV1;
 	else if (divisor <= 2)
 		val = TMIO_SD_CLKCTL_DIV2;
 	else if (divisor <= 4)
 		val = TMIO_SD_CLKCTL_DIV4;
 	else if (divisor <= 8)
 		val = TMIO_SD_CLKCTL_DIV8;
 	else if (divisor <= 16)
 		val = TMIO_SD_CLKCTL_DIV16;
 	else if (divisor <= 32)
 		val = TMIO_SD_CLKCTL_DIV32;
 	else if (divisor <= 64)
 		val = TMIO_SD_CLKCTL_DIV64;
 	else if (divisor <= 128)
 		val = TMIO_SD_CLKCTL_DIV128;
 	else if (divisor <= 256)
 		val = TMIO_SD_CLKCTL_DIV256;
 	else if (divisor <= 512 || !(priv->caps & TMIO_SD_CAP_DIV1024))
 		val = TMIO_SD_CLKCTL_DIV512;
 	else
 		val = TMIO_SD_CLKCTL_DIV1024;

 	tmp = tmio_sd_readl(priv, TMIO_SD_CLKCTL);
 	if (tmp & TMIO_SD_CLKCTL_SCLKEN &&
 	    (tmp & TMIO_SD_CLKCTL_DIV_MASK) == val)
 		return;

 	/* stop the clock before changing its rate to avoid a glitch signal */
 	tmp &= ~TMIO_SD_CLKCTL_SCLKEN;
 	tmio_sd_writel(priv, tmp, TMIO_SD_CLKCTL);

 	tmp &= ~TMIO_SD_CLKCTL_DIV_MASK;
 	tmp |= val | TMIO_SD_CLKCTL_OFFEN;
 	tmio_sd_writel(priv, tmp, TMIO_SD_CLKCTL);

 	tmp |= TMIO_SD_CLKCTL_SCLKEN;
 	tmio_sd_writel(priv, tmp, TMIO_SD_CLKCTL);

 	udelay(1000);
 }

 static void tmio_sd_set_pins(struct udevice *dev)
 {
 	__maybe_unused struct mmc *mmc = mmc_get_mmc_dev(dev);

 #ifdef CONFIG_DM_REGULATOR
 	struct tmio_sd_priv *priv = dev_get_priv(dev);

 	if (priv->vqmmc_dev) {
 		if (mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180)
 			regulator_set_value(priv->vqmmc_dev, 1800000);
 		else
 			regulator_set_value(priv->vqmmc_dev, 3300000);
 		regulator_set_enable(priv->vqmmc_dev, true);
 	}
 #endif

 #ifdef CONFIG_PINCTRL
 	switch (mmc->selected_mode) {
 	case MMC_LEGACY:
 	case SD_LEGACY:
 	case MMC_HS:
 	case SD_HS:
 	case MMC_HS_52:
 	case MMC_DDR_52:
 		pinctrl_select_state(dev, "default");
 		break;
 	case UHS_SDR12:
 	case UHS_SDR25:
 	case UHS_SDR50:
 	case UHS_DDR50:
 	case UHS_SDR104:
 	case MMC_HS_200:
 		pinctrl_select_state(dev, "state_uhs");
 		break;
 	default:
 		break;
 	}
 #endif
 }

 int tmio_sd_set_ios(struct udevice *dev)
 {
 	struct tmio_sd_priv *priv = dev_get_priv(dev);
 	struct mmc *mmc = mmc_get_mmc_dev(dev);
 	int ret;

 	dev_dbg(dev, "clock %uHz, DDRmode %d, width %u\n",
 		mmc->clock, mmc->ddr_mode, mmc->bus_width);

 	ret = tmio_sd_set_bus_width(priv, mmc);
 	if (ret)
 		return ret;
 	tmio_sd_set_ddr_mode(priv, mmc);
 	tmio_sd_set_clk_rate(priv, mmc);
 	tmio_sd_set_pins(dev);

 	return 0;
 }

 int tmio_sd_get_cd(struct udevice *dev)
 {
 	struct tmio_sd_priv *priv = dev_get_priv(dev);

 	if (priv->caps & TMIO_SD_CAP_NONREMOVABLE)
 		return 1;

 	return !!(tmio_sd_readl(priv, TMIO_SD_INFO1) &
 		  TMIO_SD_INFO1_CD);
 }

 static void tmio_sd_host_init(struct tmio_sd_priv *priv)
 {
 	u32 tmp;

 	/* soft reset of the host */
 	tmp = tmio_sd_readl(priv, TMIO_SD_SOFT_RST);
 	tmp &= ~TMIO_SD_SOFT_RST_RSTX;
 	tmio_sd_writel(priv, tmp, TMIO_SD_SOFT_RST);
 	tmp |= TMIO_SD_SOFT_RST_RSTX;
 	tmio_sd_writel(priv, tmp, TMIO_SD_SOFT_RST);

 	/* FIXME: implement eMMC hw_reset */

 	tmio_sd_writel(priv, TMIO_SD_STOP_SEC, TMIO_SD_STOP);

 	/*
 	 * Connected to 32bit AXI.
 	 * This register dropped backward compatibility at version 0x10.
 	 * Write an appropriate value depending on the IP version.
 	 */
 	if (priv->version >= 0x10)
 		tmio_sd_writel(priv, 0x101, TMIO_SD_HOST_MODE);
 	else
 		tmio_sd_writel(priv, 0x0, TMIO_SD_HOST_MODE);

 	if (priv->caps & TMIO_SD_CAP_DMA_INTERNAL) {
 		tmp = tmio_sd_readl(priv, TMIO_SD_DMA_MODE);
 		tmp |= TMIO_SD_DMA_MODE_ADDR_INC;
 		tmio_sd_writel(priv, tmp, TMIO_SD_DMA_MODE);
 	}
 }

 int tmio_sd_bind(struct udevice *dev)
 {
 	struct tmio_sd_plat *plat = dev_get_platdata(dev);

 	return mmc_bind(dev, &plat->mmc, &plat->cfg);
 }

 int tmio_sd_probe(struct udevice *dev, u32 quirks)
 {
 	struct tmio_sd_plat *plat = dev_get_platdata(dev);
 	struct tmio_sd_priv *priv = dev_get_priv(dev);
 	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 	fdt_addr_t base;
 	int ret;

 	base = devfdt_get_addr(dev);
 	if (base == FDT_ADDR_T_NONE)
 		return -EINVAL;

 	priv->regbase = devm_ioremap(dev, base, SZ_2K);
 	if (!priv->regbase)
 		return -ENOMEM;

 #ifdef CONFIG_DM_REGULATOR
 	device_get_supply_regulator(dev, "vqmmc-supply", &priv->vqmmc_dev);
 #endif

 	ret = mmc_of_parse(dev, &plat->cfg);
 	if (ret < 0) {
 		dev_err(dev, "failed to parse host caps\n");
 		return ret;
 	}

 	plat->cfg.name = dev->name;
 	plat->cfg.host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;

 	if (quirks)
 		priv->caps = quirks;

 	priv->version = tmio_sd_readl(priv, TMIO_SD_VERSION) &
 						TMIO_SD_VERSION_IP;
 	dev_dbg(dev, "version %x\n", priv->version);
 	if (priv->version >= 0x10) {
 		priv->caps |= TMIO_SD_CAP_DMA_INTERNAL;
 		priv->caps |= TMIO_SD_CAP_DIV1024;
 	}

 	if (fdt_get_property(gd->fdt_blob, dev_of_offset(dev), "non-removable",
 			     NULL))
 		priv->caps |= TMIO_SD_CAP_NONREMOVABLE;

 	tmio_sd_host_init(priv);

 	plat->cfg.voltages = MMC_VDD_165_195 | MMC_VDD_32_33 | MMC_VDD_33_34;
 	plat->cfg.f_min = priv->mclk /
 			(priv->caps & TMIO_SD_CAP_DIV1024 ? 1024 : 512);
 	plat->cfg.f_max = priv->mclk;
 	plat->cfg.b_max = U32_MAX; /* max value of TMIO_SD_SECCNT */

 	upriv->mmc = &plat->mmc;

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2016 Socionext Inc.
	* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
	*/

	#include <common.h>
	#include <clk.h>
	#include <fdtdec.h>
	#include <mmc.h>
	#include <dm.h>
	#include <dm/pinctrl.h>
	#include <linux/compat.h>
	#include <linux/dma-direction.h>
	#include <linux/io.h>
	#include <linux/sizes.h>
	#include <power/regulator.h>
	#include <asm/unaligned.h>

	#include "tmio-common.h"

	DECLARE_GLOBAL_DATA_PTR;

	static u64 tmio_sd_readq(struct tmio_sd_priv *priv, unsigned int reg)
	{
	return readq(priv->regbase + (reg << 1));
	}

	static void tmio_sd_writeq(struct tmio_sd_priv *priv,
	u64 val, unsigned int reg)
	{
	writeq(val, priv->regbase + (reg << 1));
	}

	static u16 tmio_sd_readw(struct tmio_sd_priv *priv, unsigned int reg)
	{
	return readw(priv->regbase + (reg >> 1));
	}

	static void tmio_sd_writew(struct tmio_sd_priv *priv,
	u16 val, unsigned int reg)
	{
	writew(val, priv->regbase + (reg >> 1));
	}

	u32 tmio_sd_readl(struct tmio_sd_priv *priv, unsigned int reg)
	{
	u32 val;

	if (priv->caps & TMIO_SD_CAP_64BIT)
	return readl(priv->regbase + (reg << 1));
	else if (priv->caps & TMIO_SD_CAP_16BIT) {
	val = readw(priv->regbase + (reg >> 1)) & 0xffff;
	if ((reg == TMIO_SD_RSP10) \|\| (reg == TMIO_SD_RSP32) \|\|
	(reg == TMIO_SD_RSP54) \|\| (reg == TMIO_SD_RSP76)) {
	val \|= readw(priv->regbase + (reg >> 1) + 2) << 16;
	}
	return val;
	} else
	return readl(priv->regbase + reg);
	}

	void tmio_sd_writel(struct tmio_sd_priv *priv,
	u32 val, unsigned int reg)
	{
	if (priv->caps & TMIO_SD_CAP_64BIT)
	writel(val, priv->regbase + (reg << 1));
	else if (priv->caps & TMIO_SD_CAP_16BIT) {
	writew(val & 0xffff, priv->regbase + (reg >> 1));
	if (reg == TMIO_SD_INFO1 \|\| reg == TMIO_SD_INFO1_MASK \|\|
	reg == TMIO_SD_INFO2 \|\| reg == TMIO_SD_INFO2_MASK \|\|
	reg == TMIO_SD_ARG)
	writew(val >> 16, priv->regbase + (reg >> 1) + 2);
	} else
	writel(val, priv->regbase + reg);
	}

	static dma_addr_t __dma_map_single(void *ptr, size_t size,
	enum dma_data_direction dir)
	{
	unsigned long addr = (unsigned long)ptr;

	if (dir == DMA_FROM_DEVICE)
	invalidate_dcache_range(addr, addr + size);
	else
	flush_dcache_range(addr, addr + size);

	return addr;
	}

	static void __dma_unmap_single(dma_addr_t addr, size_t size,
	enum dma_data_direction dir)
	{
	if (dir != DMA_TO_DEVICE)
	invalidate_dcache_range(addr, addr + size);
	}

	static int tmio_sd_check_error(struct udevice *dev)
	{
	struct tmio_sd_priv *priv = dev_get_priv(dev);
	u32 info2 = tmio_sd_readl(priv, TMIO_SD_INFO2);

	if (info2 & TMIO_SD_INFO2_ERR_RTO) {
	/*
	* TIMEOUT must be returned for unsupported command. Do not
	* display error log since this might be a part of sequence to
	* distinguish between SD and MMC.
	*/
	return -ETIMEDOUT;
	}

	if (info2 & TMIO_SD_INFO2_ERR_TO) {
	dev_err(dev, "timeout error\n");
	return -ETIMEDOUT;
	}

	if (info2 & (TMIO_SD_INFO2_ERR_END \| TMIO_SD_INFO2_ERR_CRC \|
	TMIO_SD_INFO2_ERR_IDX)) {
	dev_err(dev, "communication out of sync\n");
	return -EILSEQ;
	}

	if (info2 & (TMIO_SD_INFO2_ERR_ILA \| TMIO_SD_INFO2_ERR_ILR \|
	TMIO_SD_INFO2_ERR_ILW)) {
	dev_err(dev, "illegal access\n");
	return -EIO;
	}

	return 0;
	}

	static int tmio_sd_wait_for_irq(struct udevice *dev, unsigned int reg,
	u32 flag)
	{
	struct tmio_sd_priv *priv = dev_get_priv(dev);
	long wait = 1000000;
	int ret;

	while (!(tmio_sd_readl(priv, reg) & flag)) {
	if (wait-- < 0) {
	dev_err(dev, "timeout\n");
	return -ETIMEDOUT;
	}

	ret = tmio_sd_check_error(dev);
	if (ret)
	return ret;

	udelay(1);
	}

	return 0;
	}

	#define tmio_pio_read_fifo(__width, __suffix) \
	static void tmio_pio_read_fifo_##__width(struct tmio_sd_priv *priv, \
	char *pbuf, uint blksz) \
	{ \
	u##__width buf = (u##__width )pbuf; \
	int i; \
	\
	if (likely(IS_ALIGNED((uintptr_t)buf, ((__width) / 8)))) { \
	for (i = 0; i < blksz / ((__width) / 8); i++) { \
	*buf++ = tmio_sd_read##__suffix(priv, \
	TMIO_SD_BUF); \
	} \
	} else { \
	for (i = 0; i < blksz / ((__width) / 8); i++) { \
	u##__width data; \
	data = tmio_sd_read##__suffix(priv, \
	TMIO_SD_BUF); \
	put_unaligned(data, buf++); \
	} \
	} \
	}

	tmio_pio_read_fifo(64, q)
	tmio_pio_read_fifo(32, l)
	tmio_pio_read_fifo(16, w)

	static int tmio_sd_pio_read_one_block(struct udevice dev, char pbuf,
	uint blocksize)
	{
	struct tmio_sd_priv *priv = dev_get_priv(dev);
	int ret;

	/* wait until the buffer is filled with data */
	ret = tmio_sd_wait_for_irq(dev, TMIO_SD_INFO2,
	TMIO_SD_INFO2_BRE);
	if (ret)
	return ret;

	/*
	* Clear the status flag _before_ read the buffer out because
	* TMIO_SD_INFO2_BRE is edge-triggered, not level-triggered.
	*/
	tmio_sd_writel(priv, 0, TMIO_SD_INFO2);

	if (priv->caps & TMIO_SD_CAP_64BIT)
	tmio_pio_read_fifo_64(priv, pbuf, blocksize);
	else if (priv->caps & TMIO_SD_CAP_16BIT)
	tmio_pio_read_fifo_16(priv, pbuf, blocksize);
	else
	tmio_pio_read_fifo_32(priv, pbuf, blocksize);

	return 0;
	}

	#define tmio_pio_write_fifo(__width, __suffix) \
	static void tmio_pio_write_fifo_##__width(struct tmio_sd_priv *priv, \
	const char *pbuf, uint blksz)\
	{ \
	const u##__width buf = (const u##__width )pbuf; \
	int i; \
	\
	if (likely(IS_ALIGNED((uintptr_t)buf, ((__width) / 8)))) { \
	for (i = 0; i < blksz / ((__width) / 8); i++) { \
	tmio_sd_write##__suffix(priv, *buf++, \
	TMIO_SD_BUF); \
	} \
	} else { \
	for (i = 0; i < blksz / ((__width) / 8); i++) { \
	u##__width data = get_unaligned(buf++); \
	tmio_sd_write##__suffix(priv, data, \
	TMIO_SD_BUF); \
	} \
	} \
	}

	tmio_pio_write_fifo(64, q)
	tmio_pio_write_fifo(32, l)
	tmio_pio_write_fifo(16, w)

	static int tmio_sd_pio_write_one_block(struct udevice *dev,
	const char *pbuf, uint blocksize)
	{
	struct tmio_sd_priv *priv = dev_get_priv(dev);
	int ret;

	/* wait until the buffer becomes empty */
	ret = tmio_sd_wait_for_irq(dev, TMIO_SD_INFO2,
	TMIO_SD_INFO2_BWE);
	if (ret)
	return ret;

	tmio_sd_writel(priv, 0, TMIO_SD_INFO2);

	if (priv->caps & TMIO_SD_CAP_64BIT)
	tmio_pio_write_fifo_64(priv, pbuf, blocksize);
	else if (priv->caps & TMIO_SD_CAP_16BIT)
	tmio_pio_write_fifo_16(priv, pbuf, blocksize);
	else
	tmio_pio_write_fifo_32(priv, pbuf, blocksize);

	return 0;
	}

	static int tmio_sd_pio_xfer(struct udevice dev, struct mmc_data data)
	{
	const char *src = data->src;
	char *dest = data->dest;
	int i, ret;

	for (i = 0; i < data->blocks; i++) {
	if (data->flags & MMC_DATA_READ)
	ret = tmio_sd_pio_read_one_block(dev, dest,
	data->blocksize);
	else
	ret = tmio_sd_pio_write_one_block(dev, src,
	data->blocksize);
	if (ret)
	return ret;

	if (data->flags & MMC_DATA_READ)
	dest += data->blocksize;
	else
	src += data->blocksize;
	}

	return 0;
	}

	static void tmio_sd_dma_start(struct tmio_sd_priv *priv,
	dma_addr_t dma_addr)
	{
	u32 tmp;

	tmio_sd_writel(priv, 0, TMIO_SD_DMA_INFO1);
	tmio_sd_writel(priv, 0, TMIO_SD_DMA_INFO2);

	/* enable DMA */
	tmp = tmio_sd_readl(priv, TMIO_SD_EXTMODE);
	tmp \|= TMIO_SD_EXTMODE_DMA_EN;
	tmio_sd_writel(priv, tmp, TMIO_SD_EXTMODE);

	tmio_sd_writel(priv, dma_addr & U32_MAX, TMIO_SD_DMA_ADDR_L);

	/* suppress the warning "right shift count >= width of type" */
	dma_addr >>= min_t(int, 32, 8 * sizeof(dma_addr));

	tmio_sd_writel(priv, dma_addr & U32_MAX, TMIO_SD_DMA_ADDR_H);

	tmio_sd_writel(priv, TMIO_SD_DMA_CTL_START, TMIO_SD_DMA_CTL);
	}

	static int tmio_sd_dma_wait_for_irq(struct udevice *dev, u32 flag,
	unsigned int blocks)
	{
	struct tmio_sd_priv *priv = dev_get_priv(dev);
	long wait = 1000000 + 10 * blocks;

	while (!(tmio_sd_readl(priv, TMIO_SD_DMA_INFO1) & flag)) {
	if (wait-- < 0) {
	dev_err(dev, "timeout during DMA\n");
	return -ETIMEDOUT;
	}

	udelay(10);
	}

	if (tmio_sd_readl(priv, TMIO_SD_DMA_INFO2)) {
	dev_err(dev, "error during DMA\n");
	return -EIO;
	}

	return 0;
	}

	static int tmio_sd_dma_xfer(struct udevice dev, struct mmc_data data)
	{
	struct tmio_sd_priv *priv = dev_get_priv(dev);
	size_t len = data->blocks * data->blocksize;
	void *buf;
	enum dma_data_direction dir;
	dma_addr_t dma_addr;
	u32 poll_flag, tmp;
	int ret;

	tmp = tmio_sd_readl(priv, TMIO_SD_DMA_MODE);

	if (data->flags & MMC_DATA_READ) {
	buf = data->dest;
	dir = DMA_FROM_DEVICE;
	/*
	* The DMA READ completion flag position differs on Socionext
	* and Renesas SoCs. It is bit 20 on Socionext SoCs and using
	* bit 17 is a hardware bug and forbidden. It is bit 17 on
	* Renesas SoCs and bit 20 does not work on them.
	*/
	poll_flag = (priv->caps & TMIO_SD_CAP_RCAR) ?
	TMIO_SD_DMA_INFO1_END_RD :
	TMIO_SD_DMA_INFO1_END_RD2;
	tmp \|= TMIO_SD_DMA_MODE_DIR_RD;
	} else {
	buf = (void *)data->src;
	dir = DMA_TO_DEVICE;
	poll_flag = TMIO_SD_DMA_INFO1_END_WR;
	tmp &= ~TMIO_SD_DMA_MODE_DIR_RD;
	}

	tmio_sd_writel(priv, tmp, TMIO_SD_DMA_MODE);

	dma_addr = __dma_map_single(buf, len, dir);

	tmio_sd_dma_start(priv, dma_addr);

	ret = tmio_sd_dma_wait_for_irq(dev, poll_flag, data->blocks);

	__dma_unmap_single(dma_addr, len, dir);

	return ret;
	}

	/* check if the address is DMA'able */
	static bool tmio_sd_addr_is_dmaable(const char *src)
	{
	uintptr_t addr = (uintptr_t)src;

	if (!IS_ALIGNED(addr, TMIO_SD_DMA_MINALIGN))
	return false;

	#if defined(CONFIG_RCAR_GEN3)
	/* Gen3 DMA has 32bit limit */
	if (addr >> 32)
	return false;
	#endif

	#if defined(CONFIG_ARCH_UNIPHIER) && !defined(CONFIG_ARM64) && \
	defined(CONFIG_SPL_BUILD)
	/*
	* For UniPhier ARMv7 SoCs, the stack is allocated in the locked ways
	* of L2, which is unreachable from the DMA engine.
	*/
	if (addr < CONFIG_SPL_STACK)
	return false;
	#endif

	return true;
	}

	int tmio_sd_send_cmd(struct udevice dev, struct mmc_cmd cmd,
	struct mmc_data *data)
	{
	struct tmio_sd_priv *priv = dev_get_priv(dev);
	int ret;
	u32 tmp;

	if (tmio_sd_readl(priv, TMIO_SD_INFO2) & TMIO_SD_INFO2_CBSY) {
	dev_err(dev, "command busy\n");
	return -EBUSY;
	}

	/* clear all status flags */
	tmio_sd_writel(priv, 0, TMIO_SD_INFO1);
	tmio_sd_writel(priv, 0, TMIO_SD_INFO2);

	/* disable DMA once */
	tmp = tmio_sd_readl(priv, TMIO_SD_EXTMODE);
	tmp &= ~TMIO_SD_EXTMODE_DMA_EN;
	tmio_sd_writel(priv, tmp, TMIO_SD_EXTMODE);

	tmio_sd_writel(priv, cmd->cmdarg, TMIO_SD_ARG);

	tmp = cmd->cmdidx;

	if (data) {
	tmio_sd_writel(priv, data->blocksize, TMIO_SD_SIZE);
	tmio_sd_writel(priv, data->blocks, TMIO_SD_SECCNT);

	/* Do not send CMD12 automatically */
	tmp \|= TMIO_SD_CMD_NOSTOP \| TMIO_SD_CMD_DATA;

	if (data->blocks > 1)
	tmp \|= TMIO_SD_CMD_MULTI;

	if (data->flags & MMC_DATA_READ)
	tmp \|= TMIO_SD_CMD_RD;
	}

	/*
	* Do not use the response type auto-detection on this hardware.
	* CMD8, for example, has different response types on SD and eMMC,
	* while this controller always assumes the response type for SD.
	* Set the response type manually.
	*/
	switch (cmd->resp_type) {
	case MMC_RSP_NONE:
	tmp \|= TMIO_SD_CMD_RSP_NONE;
	break;
	case MMC_RSP_R1:
	tmp \|= TMIO_SD_CMD_RSP_R1;
	break;
	case MMC_RSP_R1b:
	tmp \|= TMIO_SD_CMD_RSP_R1B;
	break;
	case MMC_RSP_R2:
	tmp \|= TMIO_SD_CMD_RSP_R2;
	break;
	case MMC_RSP_R3:
	tmp \|= TMIO_SD_CMD_RSP_R3;
	break;
	default:
	dev_err(dev, "unknown response type\n");
	return -EINVAL;
	}

	dev_dbg(dev, "sending CMD%d (SD_CMD=%08x, SD_ARG=%08x)\n",
	cmd->cmdidx, tmp, cmd->cmdarg);
	tmio_sd_writel(priv, tmp, TMIO_SD_CMD);

	ret = tmio_sd_wait_for_irq(dev, TMIO_SD_INFO1,
	TMIO_SD_INFO1_RSP);
	if (ret)
	return ret;

	if (cmd->resp_type & MMC_RSP_136) {
	u32 rsp_127_104 = tmio_sd_readl(priv, TMIO_SD_RSP76);
	u32 rsp_103_72 = tmio_sd_readl(priv, TMIO_SD_RSP54);
	u32 rsp_71_40 = tmio_sd_readl(priv, TMIO_SD_RSP32);
	u32 rsp_39_8 = tmio_sd_readl(priv, TMIO_SD_RSP10);

	cmd->response[0] = ((rsp_127_104 & 0x00ffffff) << 8) \|
	((rsp_103_72 & 0xff000000) >> 24);
	cmd->response[1] = ((rsp_103_72 & 0x00ffffff) << 8) \|
	((rsp_71_40 & 0xff000000) >> 24);
	cmd->response[2] = ((rsp_71_40 & 0x00ffffff) << 8) \|
	((rsp_39_8 & 0xff000000) >> 24);
	cmd->response[3] = (rsp_39_8 & 0xffffff) << 8;
	} else {
	/* bit 39-8 */
	cmd->response[0] = tmio_sd_readl(priv, TMIO_SD_RSP10);
	}

	if (data) {
	/* use DMA if the HW supports it and the buffer is aligned */
	if (priv->caps & TMIO_SD_CAP_DMA_INTERNAL &&
	tmio_sd_addr_is_dmaable(data->src))
	ret = tmio_sd_dma_xfer(dev, data);
	else
	ret = tmio_sd_pio_xfer(dev, data);

	ret = tmio_sd_wait_for_irq(dev, TMIO_SD_INFO1,
	TMIO_SD_INFO1_CMP);
	if (ret)
	return ret;
	}

	tmio_sd_wait_for_irq(dev, TMIO_SD_INFO2, TMIO_SD_INFO2_SCLKDIVEN);

	return ret;
	}

	static int tmio_sd_set_bus_width(struct tmio_sd_priv *priv,
	struct mmc *mmc)
	{
	u32 val, tmp;

	switch (mmc->bus_width) {
	case 0:
	case 1:
	val = TMIO_SD_OPTION_WIDTH_1;
	break;
	case 4:
	val = TMIO_SD_OPTION_WIDTH_4;
	break;
	case 8:
	val = TMIO_SD_OPTION_WIDTH_8;
	break;
	default:
	return -EINVAL;
	}

	tmp = tmio_sd_readl(priv, TMIO_SD_OPTION);
	tmp &= ~TMIO_SD_OPTION_WIDTH_MASK;
	tmp \|= val;
	tmio_sd_writel(priv, tmp, TMIO_SD_OPTION);

	return 0;
	}

	static void tmio_sd_set_ddr_mode(struct tmio_sd_priv *priv,
	struct mmc *mmc)
	{
	u32 tmp;

	tmp = tmio_sd_readl(priv, TMIO_SD_IF_MODE);
	if (mmc->ddr_mode)
	tmp \|= TMIO_SD_IF_MODE_DDR;
	else
	tmp &= ~TMIO_SD_IF_MODE_DDR;
	tmio_sd_writel(priv, tmp, TMIO_SD_IF_MODE);
	}

	static void tmio_sd_set_clk_rate(struct tmio_sd_priv *priv,
	struct mmc *mmc)
	{
	unsigned int divisor;
	u32 val, tmp;

	if (!mmc->clock)
	return;

	divisor = DIV_ROUND_UP(priv->mclk, mmc->clock);

	if (divisor <= 1)
	val = (priv->caps & TMIO_SD_CAP_RCAR) ?
	TMIO_SD_CLKCTL_RCAR_DIV1 : TMIO_SD_CLKCTL_DIV1;
	else if (divisor <= 2)
	val = TMIO_SD_CLKCTL_DIV2;
	else if (divisor <= 4)
	val = TMIO_SD_CLKCTL_DIV4;
	else if (divisor <= 8)
	val = TMIO_SD_CLKCTL_DIV8;
	else if (divisor <= 16)
	val = TMIO_SD_CLKCTL_DIV16;
	else if (divisor <= 32)
	val = TMIO_SD_CLKCTL_DIV32;
	else if (divisor <= 64)
	val = TMIO_SD_CLKCTL_DIV64;
	else if (divisor <= 128)
	val = TMIO_SD_CLKCTL_DIV128;
	else if (divisor <= 256)
	val = TMIO_SD_CLKCTL_DIV256;
	else if (divisor <= 512 \|\| !(priv->caps & TMIO_SD_CAP_DIV1024))
	val = TMIO_SD_CLKCTL_DIV512;
	else
	val = TMIO_SD_CLKCTL_DIV1024;

	tmp = tmio_sd_readl(priv, TMIO_SD_CLKCTL);
	if (tmp & TMIO_SD_CLKCTL_SCLKEN &&
	(tmp & TMIO_SD_CLKCTL_DIV_MASK) == val)
	return;

	/* stop the clock before changing its rate to avoid a glitch signal */
	tmp &= ~TMIO_SD_CLKCTL_SCLKEN;
	tmio_sd_writel(priv, tmp, TMIO_SD_CLKCTL);

	tmp &= ~TMIO_SD_CLKCTL_DIV_MASK;
	tmp \|= val \| TMIO_SD_CLKCTL_OFFEN;
	tmio_sd_writel(priv, tmp, TMIO_SD_CLKCTL);

	tmp \|= TMIO_SD_CLKCTL_SCLKEN;
	tmio_sd_writel(priv, tmp, TMIO_SD_CLKCTL);

	udelay(1000);
	}

	static void tmio_sd_set_pins(struct udevice *dev)
	{
	__maybe_unused struct mmc *mmc = mmc_get_mmc_dev(dev);

	#ifdef CONFIG_DM_REGULATOR
	struct tmio_sd_priv *priv = dev_get_priv(dev);

	if (priv->vqmmc_dev) {
	if (mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180)
	regulator_set_value(priv->vqmmc_dev, 1800000);
	else
	regulator_set_value(priv->vqmmc_dev, 3300000);
	regulator_set_enable(priv->vqmmc_dev, true);
	}
	#endif

	#ifdef CONFIG_PINCTRL
	switch (mmc->selected_mode) {
	case MMC_LEGACY:
	case SD_LEGACY:
	case MMC_HS:
	case SD_HS:
	case MMC_HS_52:
	case MMC_DDR_52:
	pinctrl_select_state(dev, "default");
	break;
	case UHS_SDR12:
	case UHS_SDR25:
	case UHS_SDR50:
	case UHS_DDR50:
	case UHS_SDR104:
	case MMC_HS_200:
	pinctrl_select_state(dev, "state_uhs");
	break;
	default:
	break;
	}
	#endif
	}

	int tmio_sd_set_ios(struct udevice *dev)
	{
	struct tmio_sd_priv *priv = dev_get_priv(dev);
	struct mmc *mmc = mmc_get_mmc_dev(dev);
	int ret;

	dev_dbg(dev, "clock %uHz, DDRmode %d, width %u\n",
	mmc->clock, mmc->ddr_mode, mmc->bus_width);

	ret = tmio_sd_set_bus_width(priv, mmc);
	if (ret)
	return ret;
	tmio_sd_set_ddr_mode(priv, mmc);
	tmio_sd_set_clk_rate(priv, mmc);
	tmio_sd_set_pins(dev);

	return 0;
	}

	int tmio_sd_get_cd(struct udevice *dev)
	{
	struct tmio_sd_priv *priv = dev_get_priv(dev);

	if (priv->caps & TMIO_SD_CAP_NONREMOVABLE)
	return 1;

	return !!(tmio_sd_readl(priv, TMIO_SD_INFO1) &
	TMIO_SD_INFO1_CD);
	}

	static void tmio_sd_host_init(struct tmio_sd_priv *priv)
	{
	u32 tmp;

	/* soft reset of the host */
	tmp = tmio_sd_readl(priv, TMIO_SD_SOFT_RST);
	tmp &= ~TMIO_SD_SOFT_RST_RSTX;
	tmio_sd_writel(priv, tmp, TMIO_SD_SOFT_RST);
	tmp \|= TMIO_SD_SOFT_RST_RSTX;
	tmio_sd_writel(priv, tmp, TMIO_SD_SOFT_RST);

	/* FIXME: implement eMMC hw_reset */

	tmio_sd_writel(priv, TMIO_SD_STOP_SEC, TMIO_SD_STOP);

	/*
	* Connected to 32bit AXI.
	* This register dropped backward compatibility at version 0x10.
	* Write an appropriate value depending on the IP version.
	*/
	if (priv->version >= 0x10)
	tmio_sd_writel(priv, 0x101, TMIO_SD_HOST_MODE);
	else
	tmio_sd_writel(priv, 0x0, TMIO_SD_HOST_MODE);

	if (priv->caps & TMIO_SD_CAP_DMA_INTERNAL) {
	tmp = tmio_sd_readl(priv, TMIO_SD_DMA_MODE);
	tmp \|= TMIO_SD_DMA_MODE_ADDR_INC;
	tmio_sd_writel(priv, tmp, TMIO_SD_DMA_MODE);
	}
	}

	int tmio_sd_bind(struct udevice *dev)
	{
	struct tmio_sd_plat *plat = dev_get_platdata(dev);

	return mmc_bind(dev, &plat->mmc, &plat->cfg);
	}

	int tmio_sd_probe(struct udevice *dev, u32 quirks)
	{
	struct tmio_sd_plat *plat = dev_get_platdata(dev);
	struct tmio_sd_priv *priv = dev_get_priv(dev);
	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
	fdt_addr_t base;
	int ret;

	base = devfdt_get_addr(dev);
	if (base == FDT_ADDR_T_NONE)
	return -EINVAL;

	priv->regbase = devm_ioremap(dev, base, SZ_2K);
	if (!priv->regbase)
	return -ENOMEM;

	#ifdef CONFIG_DM_REGULATOR
	device_get_supply_regulator(dev, "vqmmc-supply", &priv->vqmmc_dev);
	#endif

	ret = mmc_of_parse(dev, &plat->cfg);
	if (ret < 0) {
	dev_err(dev, "failed to parse host caps\n");
	return ret;
	}

	plat->cfg.name = dev->name;
	plat->cfg.host_caps \|= MMC_MODE_HS_52MHz \| MMC_MODE_HS;

	if (quirks)
	priv->caps = quirks;

	priv->version = tmio_sd_readl(priv, TMIO_SD_VERSION) &
	TMIO_SD_VERSION_IP;
	dev_dbg(dev, "version %x\n", priv->version);
	if (priv->version >= 0x10) {
	priv->caps \|= TMIO_SD_CAP_DMA_INTERNAL;
	priv->caps \|= TMIO_SD_CAP_DIV1024;
	}

	if (fdt_get_property(gd->fdt_blob, dev_of_offset(dev), "non-removable",
	NULL))
	priv->caps \|= TMIO_SD_CAP_NONREMOVABLE;

	tmio_sd_host_init(priv);

	plat->cfg.voltages = MMC_VDD_165_195 \| MMC_VDD_32_33 \| MMC_VDD_33_34;
	plat->cfg.f_min = priv->mclk /
	(priv->caps & TMIO_SD_CAP_DIV1024 ? 1024 : 512);
	plat->cfg.f_max = priv->mclk;
	plat->cfg.b_max = U32_MAX; /* max value of TMIO_SD_SECCNT */

	upriv->mmc = &plat->mmc;

	return 0;
	}