drivers/mmc/sdhci.c - u-boot - Git at Google

 /*
  * Copyright 2011, Marvell Semiconductor Inc.
  * Lei Wen <leiwen@marvell.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  *
  * Back ported to the 8xx platform (from the 8260 platform) by
  * Murray.Jensen@cmst.csiro.au, 27-Jan-01.
  */

 #include <common.h>
 #include <malloc.h>
 #include <mmc.h>
 #include <sdhci.h>

 void *aligned_buffer;

 static void sdhci_reset(struct sdhci_host *host, u8 mask)
 {
 	unsigned long timeout;

 	/* Wait max 100 ms */
 	timeout = 100;
 	sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
 	while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
 		if (timeout == 0) {
 			printf("%s: Reset 0x%x never completed.\n",
 			       __func__, (int)mask);
 			return;
 		}
 		timeout--;
 		udelay(1000);
 	}
 }

 static void sdhci_cmd_done(struct sdhci_host *host, struct mmc_cmd *cmd)
 {
 	int i;
 	if (cmd->resp_type & MMC_RSP_136) {
 		/* CRC is stripped so we need to do some shifting. */
 		for (i = 0; i < 4; i++) {
 			cmd->response[i] = sdhci_readl(host,
 					SDHCI_RESPONSE + (3-i)*4) << 8;
 			if (i != 3)
 				cmd->response[i] |= sdhci_readb(host,
 						SDHCI_RESPONSE + (3-i)*4-1);
 		}
 	} else {
 		cmd->response[0] = sdhci_readl(host, SDHCI_RESPONSE);
 	}
 }

 static void sdhci_transfer_pio(struct sdhci_host *host, struct mmc_data *data)
 {
 	int i;
 	char *offs;
 	for (i = 0; i < data->blocksize; i += 4) {
 		offs = data->dest + i;
 		if (data->flags == MMC_DATA_READ)
 			*(u32 *)offs = sdhci_readl(host, SDHCI_BUFFER);
 		else
 			sdhci_writel(host, *(u32 *)offs, SDHCI_BUFFER);
 	}
 }

 static int sdhci_transfer_data(struct sdhci_host *host, struct mmc_data *data,
 				unsigned int start_addr)
 {
 	unsigned int stat, rdy, mask, timeout, block = 0;
 #ifdef CONFIG_MMC_SDMA
 	unsigned char ctrl;
 	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 	ctrl &= ~SDHCI_CTRL_DMA_MASK;
 	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 #endif

 	timeout = 1000000;
 	rdy = SDHCI_INT_SPACE_AVAIL | SDHCI_INT_DATA_AVAIL;
 	mask = SDHCI_DATA_AVAILABLE | SDHCI_SPACE_AVAILABLE;
 	do {
 		stat = sdhci_readl(host, SDHCI_INT_STATUS);
 		if (stat & SDHCI_INT_ERROR) {
 			printf("%s: Error detected in status(0x%X)!\n",
 			       __func__, stat);
 			return -1;
 		}
 		if (stat & rdy) {
 			if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & mask))
 				continue;
 			sdhci_writel(host, rdy, SDHCI_INT_STATUS);
 			sdhci_transfer_pio(host, data);
 			data->dest += data->blocksize;
 			if (++block >= data->blocks)
 				break;
 		}
 #ifdef CONFIG_MMC_SDMA
 		if (stat & SDHCI_INT_DMA_END) {
 			sdhci_writel(host, SDHCI_INT_DMA_END, SDHCI_INT_STATUS);
 			start_addr &= ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1);
 			start_addr += SDHCI_DEFAULT_BOUNDARY_SIZE;
 			sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
 		}
 #endif
 		if (timeout-- > 0)
 			udelay(10);
 		else {
 			printf("%s: Transfer data timeout\n", __func__);
 			return -1;
 		}
 	} while (!(stat & SDHCI_INT_DATA_END));
 	return 0;
 }

 /*
  * No command will be sent by driver if card is busy, so driver must wait
  * for card ready state.
  * Every time when card is busy after timeout then (last) timeout value will be
  * increased twice but only if it doesn't exceed global defined maximum.
  * Each function call will use last timeout value. Max timeout can be redefined
  * in board config file.
  */
 #ifndef CONFIG_SDHCI_CMD_MAX_TIMEOUT
 #define CONFIG_SDHCI_CMD_MAX_TIMEOUT		3200
 #endif
 #define CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT	100

 static int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
 		       struct mmc_data *data)
 {
 	struct sdhci_host *host = mmc->priv;
 	unsigned int stat = 0;
 	int ret = 0;
 	int trans_bytes = 0, is_aligned = 1;
 	u32 mask, flags, mode;
 	unsigned int time = 0, start_addr = 0;
 	unsigned int retry = 10000;
 	int mmc_dev = mmc->block_dev.dev;

 	/* Timeout unit - ms */
 	static unsigned int cmd_timeout = CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT;

 	sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
 	mask = SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT;

 	/* We shouldn't wait for data inihibit for stop commands, even
 	   though they might use busy signaling */
 	if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
 		mask &= ~SDHCI_DATA_INHIBIT;

 	while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
 		if (time >= cmd_timeout) {
 			printf("%s: MMC: %d busy ", __func__, mmc_dev);
 			if (2 * cmd_timeout <= CONFIG_SDHCI_CMD_MAX_TIMEOUT) {
 				cmd_timeout += cmd_timeout;
 				printf("timeout increasing to: %u ms.\n",
 				       cmd_timeout);
 			} else {
 				puts("timeout.\n");
 				return COMM_ERR;
 			}
 		}
 		time++;
 		udelay(1000);
 	}

 	mask = SDHCI_INT_RESPONSE;
 	if (!(cmd->resp_type & MMC_RSP_PRESENT))
 		flags = SDHCI_CMD_RESP_NONE;
 	else if (cmd->resp_type & MMC_RSP_136)
 		flags = SDHCI_CMD_RESP_LONG;
 	else if (cmd->resp_type & MMC_RSP_BUSY) {
 		flags = SDHCI_CMD_RESP_SHORT_BUSY;
 		mask |= SDHCI_INT_DATA_END;
 	} else
 		flags = SDHCI_CMD_RESP_SHORT;

 	if (cmd->resp_type & MMC_RSP_CRC)
 		flags |= SDHCI_CMD_CRC;
 	if (cmd->resp_type & MMC_RSP_OPCODE)
 		flags |= SDHCI_CMD_INDEX;
 	if (data)
 		flags |= SDHCI_CMD_DATA;

 	/* Set Transfer mode regarding to data flag */
 	if (data != 0) {
 		sdhci_writeb(host, 0xe, SDHCI_TIMEOUT_CONTROL);
 		mode = SDHCI_TRNS_BLK_CNT_EN;
 		trans_bytes = data->blocks * data->blocksize;
 		if (data->blocks > 1)
 			mode |= SDHCI_TRNS_MULTI;

 		if (data->flags == MMC_DATA_READ)
 			mode |= SDHCI_TRNS_READ;

 #ifdef CONFIG_MMC_SDMA
 		if (data->flags == MMC_DATA_READ)
 			start_addr = (unsigned int)data->dest;
 		else
 			start_addr = (unsigned int)data->src;
 		if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
 				(start_addr & 0x7) != 0x0) {
 			is_aligned = 0;
 			start_addr = (unsigned int)aligned_buffer;
 			if (data->flags != MMC_DATA_READ)
 				memcpy(aligned_buffer, data->src, trans_bytes);
 		}

 		sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
 		mode |= SDHCI_TRNS_DMA;
 #endif
 		sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
 				data->blocksize),
 				SDHCI_BLOCK_SIZE);
 		sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
 		sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
 	}

 	sdhci_writel(host, cmd->cmdarg, SDHCI_ARGUMENT);
 #ifdef CONFIG_MMC_SDMA
 	flush_cache(start_addr, trans_bytes);
 #endif
 	sdhci_writew(host, SDHCI_MAKE_CMD(cmd->cmdidx, flags), SDHCI_COMMAND);
 	do {
 		stat = sdhci_readl(host, SDHCI_INT_STATUS);
 		if (stat & SDHCI_INT_ERROR)
 			break;
 		if (--retry == 0)
 			break;
 	} while ((stat & mask) != mask);

 	if (retry == 0) {
 		if (host->quirks & SDHCI_QUIRK_BROKEN_R1B)
 			return 0;
 		else {
 			printf("%s: Timeout for status update!\n", __func__);
 			return TIMEOUT;
 		}
 	}

 	if ((stat & (SDHCI_INT_ERROR | mask)) == mask) {
 		sdhci_cmd_done(host, cmd);
 		sdhci_writel(host, mask, SDHCI_INT_STATUS);
 	} else
 		ret = -1;

 	if (!ret && data)
 		ret = sdhci_transfer_data(host, data, start_addr);

 	if (host->quirks & SDHCI_QUIRK_WAIT_SEND_CMD)
 		udelay(1000);

 	stat = sdhci_readl(host, SDHCI_INT_STATUS);
 	sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
 	if (!ret) {
 		if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
 				!is_aligned && (data->flags == MMC_DATA_READ))
 			memcpy(data->dest, aligned_buffer, trans_bytes);
 		return 0;
 	}

 	sdhci_reset(host, SDHCI_RESET_CMD);
 	sdhci_reset(host, SDHCI_RESET_DATA);
 	if (stat & SDHCI_INT_TIMEOUT)
 		return TIMEOUT;
 	else
 		return COMM_ERR;
 }

 static int sdhci_set_clock(struct mmc *mmc, unsigned int clock)
 {
 	struct sdhci_host *host = mmc->priv;
 	unsigned int div, clk, timeout;

 	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);

 	if (clock == 0)
 		return 0;

 	if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) {
 		/* Version 3.00 divisors must be a multiple of 2. */
 		if (mmc->cfg->f_max <= clock)
 			div = 1;
 		else {
 			for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; div += 2) {
 				if ((mmc->cfg->f_max / div) <= clock)
 					break;
 			}
 		}
 	} else {
 		/* Version 2.00 divisors must be a power of 2. */
 		for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
 			if ((mmc->cfg->f_max / div) <= clock)
 				break;
 		}
 	}
 	div >>= 1;

 	if (host->set_clock)
 		host->set_clock(host->index, div);

 	clk = (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
 	clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
 		<< SDHCI_DIVIDER_HI_SHIFT;
 	clk |= SDHCI_CLOCK_INT_EN;
 	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);

 	/* Wait max 20 ms */
 	timeout = 20;
 	while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
 		& SDHCI_CLOCK_INT_STABLE)) {
 		if (timeout == 0) {
 			printf("%s: Internal clock never stabilised.\n",
 			       __func__);
 			return -1;
 		}
 		timeout--;
 		udelay(1000);
 	}

 	clk |= SDHCI_CLOCK_CARD_EN;
 	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
 	return 0;
 }

 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
 {
 	u8 pwr = 0;

 	if (power != (unsigned short)-1) {
 		switch (1 << power) {
 		case MMC_VDD_165_195:
 			pwr = SDHCI_POWER_180;
 			break;
 		case MMC_VDD_29_30:
 		case MMC_VDD_30_31:
 			pwr = SDHCI_POWER_300;
 			break;
 		case MMC_VDD_32_33:
 		case MMC_VDD_33_34:
 			pwr = SDHCI_POWER_330;
 			break;
 		}
 	}

 	if (pwr == 0) {
 		sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
 		return;
 	}

 	if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
 		sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);

 	pwr |= SDHCI_POWER_ON;

 	sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
 }

 static void sdhci_set_ios(struct mmc *mmc)
 {
 	u32 ctrl;
 	struct sdhci_host *host = mmc->priv;

 	if (host->set_control_reg)
 		host->set_control_reg(host);

 	if (mmc->clock != host->clock)
 		sdhci_set_clock(mmc, mmc->clock);

 	/* Set bus width */
 	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 	if (mmc->bus_width == 8) {
 		ctrl &= ~SDHCI_CTRL_4BITBUS;
 		if ((SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) ||
 				(host->quirks & SDHCI_QUIRK_USE_WIDE8))
 			ctrl |= SDHCI_CTRL_8BITBUS;
 	} else {
 		if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
 			ctrl &= ~SDHCI_CTRL_8BITBUS;
 		if (mmc->bus_width == 4)
 			ctrl |= SDHCI_CTRL_4BITBUS;
 		else
 			ctrl &= ~SDHCI_CTRL_4BITBUS;
 	}

 	if (mmc->clock > 26000000)
 		ctrl |= SDHCI_CTRL_HISPD;
 	else
 		ctrl &= ~SDHCI_CTRL_HISPD;

 	if (host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)
 		ctrl &= ~SDHCI_CTRL_HISPD;

 	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 }

 static int sdhci_init(struct mmc *mmc)
 {
 	struct sdhci_host *host = mmc->priv;

 	if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) && !aligned_buffer) {
 		aligned_buffer = memalign(8, 512*1024);
 		if (!aligned_buffer) {
 			printf("%s: Aligned buffer alloc failed!!!\n",
 			       __func__);
 			return -1;
 		}
 	}

 	sdhci_set_power(host, fls(mmc->cfg->voltages) - 1);

 	if (host->quirks & SDHCI_QUIRK_NO_CD) {
 		unsigned int status;

 		sdhci_writel(host, SDHCI_CTRL_CD_TEST_INS | SDHCI_CTRL_CD_TEST,
 			SDHCI_HOST_CONTROL);

 		status = sdhci_readl(host, SDHCI_PRESENT_STATE);
 		while ((!(status & SDHCI_CARD_PRESENT)) ||
 		    (!(status & SDHCI_CARD_STATE_STABLE)) ||
 		    (!(status & SDHCI_CARD_DETECT_PIN_LEVEL)))
 			status = sdhci_readl(host, SDHCI_PRESENT_STATE);
 	}

 	/* Enable only interrupts served by the SD controller */
 	sdhci_writel(host, SDHCI_INT_DATA_MASK | SDHCI_INT_CMD_MASK,
 		     SDHCI_INT_ENABLE);
 	/* Mask all sdhci interrupt sources */
 	sdhci_writel(host, 0x0, SDHCI_SIGNAL_ENABLE);

 	return 0;
 }


 static const struct mmc_ops sdhci_ops = {
 	.send_cmd	= sdhci_send_command,
 	.set_ios	= sdhci_set_ios,
 	.init		= sdhci_init,
 };

 int add_sdhci(struct sdhci_host *host, u32 max_clk, u32 min_clk)
 {
 	unsigned int caps;

 	host->cfg.name = host->name;
 	host->cfg.ops = &sdhci_ops;

 	caps = sdhci_readl(host, SDHCI_CAPABILITIES);
 #ifdef CONFIG_MMC_SDMA
 	if (!(caps & SDHCI_CAN_DO_SDMA)) {
 		printf("%s: Your controller doesn't support SDMA!!\n",
 		       __func__);
 		return -1;
 	}
 #endif

 	if (max_clk)
 		host->cfg.f_max = max_clk;
 	else {
 		if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
 			host->cfg.f_max = (caps & SDHCI_CLOCK_V3_BASE_MASK)
 				>> SDHCI_CLOCK_BASE_SHIFT;
 		else
 			host->cfg.f_max = (caps & SDHCI_CLOCK_BASE_MASK)
 				>> SDHCI_CLOCK_BASE_SHIFT;
 		host->cfg.f_max *= 1000000;
 	}
 	if (host->cfg.f_max == 0) {
 		printf("%s: Hardware doesn't specify base clock frequency\n",
 		       __func__);
 		return -1;
 	}
 	if (min_clk)
 		host->cfg.f_min = min_clk;
 	else {
 		if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
 			host->cfg.f_min = host->cfg.f_max /
 				SDHCI_MAX_DIV_SPEC_300;
 		else
 			host->cfg.f_min = host->cfg.f_max /
 				SDHCI_MAX_DIV_SPEC_200;
 	}

 	host->cfg.voltages = 0;
 	if (caps & SDHCI_CAN_VDD_330)
 		host->cfg.voltages |= MMC_VDD_32_33 | MMC_VDD_33_34;
 	if (caps & SDHCI_CAN_VDD_300)
 		host->cfg.voltages |= MMC_VDD_29_30 | MMC_VDD_30_31;
 	if (caps & SDHCI_CAN_VDD_180)
 		host->cfg.voltages |= MMC_VDD_165_195;

 	if (host->quirks & SDHCI_QUIRK_BROKEN_VOLTAGE)
 		host->cfg.voltages |= host->voltages;

 	host->cfg.host_caps = MMC_MODE_HS | MMC_MODE_HS_52MHz | MMC_MODE_4BIT;
 	if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) {
 		if (caps & SDHCI_CAN_DO_8BIT)
 			host->cfg.host_caps |= MMC_MODE_8BIT;
 	}
 	if (host->host_caps)
 		host->cfg.host_caps |= host->host_caps;

 	host->cfg.b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;

 	sdhci_reset(host, SDHCI_RESET_ALL);

 	host->mmc = mmc_create(&host->cfg, host);
 	if (host->mmc == NULL) {
 		printf("%s: mmc create fail!\n", __func__);
 		return -1;
 	}

 	return 0;
 }
	/*
	* Copyright 2011, Marvell Semiconductor Inc.
	* Lei Wen <leiwen@marvell.com>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*
	* Back ported to the 8xx platform (from the 8260 platform) by
	* Murray.Jensen@cmst.csiro.au, 27-Jan-01.
	*/

	#include <common.h>
	#include <malloc.h>
	#include <mmc.h>
	#include <sdhci.h>

	void *aligned_buffer;

	static void sdhci_reset(struct sdhci_host *host, u8 mask)
	{
	unsigned long timeout;

	/* Wait max 100 ms */
	timeout = 100;
	sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
	while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
	if (timeout == 0) {
	printf("%s: Reset 0x%x never completed.\n",
	__func__, (int)mask);
	return;
	}
	timeout--;
	udelay(1000);
	}
	}

	static void sdhci_cmd_done(struct sdhci_host host, struct mmc_cmd cmd)
	{
	int i;
	if (cmd->resp_type & MMC_RSP_136) {
	/* CRC is stripped so we need to do some shifting. */
	for (i = 0; i < 4; i++) {
	cmd->response[i] = sdhci_readl(host,
	SDHCI_RESPONSE + (3-i)*4) << 8;
	if (i != 3)
	cmd->response[i] \|= sdhci_readb(host,
	SDHCI_RESPONSE + (3-i)*4-1);
	}
	} else {
	cmd->response[0] = sdhci_readl(host, SDHCI_RESPONSE);
	}
	}

	static void sdhci_transfer_pio(struct sdhci_host host, struct mmc_data data)
	{
	int i;
	char *offs;
	for (i = 0; i < data->blocksize; i += 4) {
	offs = data->dest + i;
	if (data->flags == MMC_DATA_READ)
	(u32 )offs = sdhci_readl(host, SDHCI_BUFFER);
	else
	sdhci_writel(host, (u32 )offs, SDHCI_BUFFER);
	}
	}

	static int sdhci_transfer_data(struct sdhci_host host, struct mmc_data data,
	unsigned int start_addr)
	{
	unsigned int stat, rdy, mask, timeout, block = 0;
	#ifdef CONFIG_MMC_SDMA
	unsigned char ctrl;
	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
	ctrl &= ~SDHCI_CTRL_DMA_MASK;
	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
	#endif

	timeout = 1000000;
	rdy = SDHCI_INT_SPACE_AVAIL \| SDHCI_INT_DATA_AVAIL;
	mask = SDHCI_DATA_AVAILABLE \| SDHCI_SPACE_AVAILABLE;
	do {
	stat = sdhci_readl(host, SDHCI_INT_STATUS);
	if (stat & SDHCI_INT_ERROR) {
	printf("%s: Error detected in status(0x%X)!\n",
	__func__, stat);
	return -1;
	}
	if (stat & rdy) {
	if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & mask))
	continue;
	sdhci_writel(host, rdy, SDHCI_INT_STATUS);
	sdhci_transfer_pio(host, data);
	data->dest += data->blocksize;
	if (++block >= data->blocks)
	break;
	}
	#ifdef CONFIG_MMC_SDMA
	if (stat & SDHCI_INT_DMA_END) {
	sdhci_writel(host, SDHCI_INT_DMA_END, SDHCI_INT_STATUS);
	start_addr &= ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1);
	start_addr += SDHCI_DEFAULT_BOUNDARY_SIZE;
	sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
	}
	#endif
	if (timeout-- > 0)
	udelay(10);
	else {
	printf("%s: Transfer data timeout\n", __func__);
	return -1;
	}
	} while (!(stat & SDHCI_INT_DATA_END));
	return 0;
	}

	/*
	* No command will be sent by driver if card is busy, so driver must wait
	* for card ready state.
	* Every time when card is busy after timeout then (last) timeout value will be
	* increased twice but only if it doesn't exceed global defined maximum.
	* Each function call will use last timeout value. Max timeout can be redefined
	* in board config file.
	*/
	#ifndef CONFIG_SDHCI_CMD_MAX_TIMEOUT
	#define CONFIG_SDHCI_CMD_MAX_TIMEOUT 3200
	#endif
	#define CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT 100

	static int sdhci_send_command(struct mmc mmc, struct mmc_cmd cmd,
	struct mmc_data *data)
	{
	struct sdhci_host *host = mmc->priv;
	unsigned int stat = 0;
	int ret = 0;
	int trans_bytes = 0, is_aligned = 1;
	u32 mask, flags, mode;
	unsigned int time = 0, start_addr = 0;
	unsigned int retry = 10000;
	int mmc_dev = mmc->block_dev.dev;

	/* Timeout unit - ms */
	static unsigned int cmd_timeout = CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT;

	sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
	mask = SDHCI_CMD_INHIBIT \| SDHCI_DATA_INHIBIT;

	/* We shouldn't wait for data inihibit for stop commands, even
	though they might use busy signaling */
	if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
	mask &= ~SDHCI_DATA_INHIBIT;

	while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
	if (time >= cmd_timeout) {
	printf("%s: MMC: %d busy ", __func__, mmc_dev);
	if (2 * cmd_timeout <= CONFIG_SDHCI_CMD_MAX_TIMEOUT) {
	cmd_timeout += cmd_timeout;
	printf("timeout increasing to: %u ms.\n",
	cmd_timeout);
	} else {
	puts("timeout.\n");
	return COMM_ERR;
	}
	}
	time++;
	udelay(1000);
	}

	mask = SDHCI_INT_RESPONSE;
	if (!(cmd->resp_type & MMC_RSP_PRESENT))
	flags = SDHCI_CMD_RESP_NONE;
	else if (cmd->resp_type & MMC_RSP_136)
	flags = SDHCI_CMD_RESP_LONG;
	else if (cmd->resp_type & MMC_RSP_BUSY) {
	flags = SDHCI_CMD_RESP_SHORT_BUSY;
	mask \|= SDHCI_INT_DATA_END;
	} else
	flags = SDHCI_CMD_RESP_SHORT;

	if (cmd->resp_type & MMC_RSP_CRC)
	flags \|= SDHCI_CMD_CRC;
	if (cmd->resp_type & MMC_RSP_OPCODE)
	flags \|= SDHCI_CMD_INDEX;
	if (data)
	flags \|= SDHCI_CMD_DATA;

	/* Set Transfer mode regarding to data flag */
	if (data != 0) {
	sdhci_writeb(host, 0xe, SDHCI_TIMEOUT_CONTROL);
	mode = SDHCI_TRNS_BLK_CNT_EN;
	trans_bytes = data->blocks * data->blocksize;
	if (data->blocks > 1)
	mode \|= SDHCI_TRNS_MULTI;

	if (data->flags == MMC_DATA_READ)
	mode \|= SDHCI_TRNS_READ;

	#ifdef CONFIG_MMC_SDMA
	if (data->flags == MMC_DATA_READ)
	start_addr = (unsigned int)data->dest;
	else
	start_addr = (unsigned int)data->src;
	if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
	(start_addr & 0x7) != 0x0) {
	is_aligned = 0;
	start_addr = (unsigned int)aligned_buffer;
	if (data->flags != MMC_DATA_READ)
	memcpy(aligned_buffer, data->src, trans_bytes);
	}

	sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
	mode \|= SDHCI_TRNS_DMA;
	#endif
	sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
	data->blocksize),
	SDHCI_BLOCK_SIZE);
	sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
	sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
	}

	sdhci_writel(host, cmd->cmdarg, SDHCI_ARGUMENT);
	#ifdef CONFIG_MMC_SDMA
	flush_cache(start_addr, trans_bytes);
	#endif
	sdhci_writew(host, SDHCI_MAKE_CMD(cmd->cmdidx, flags), SDHCI_COMMAND);
	do {
	stat = sdhci_readl(host, SDHCI_INT_STATUS);
	if (stat & SDHCI_INT_ERROR)
	break;
	if (--retry == 0)
	break;
	} while ((stat & mask) != mask);

	if (retry == 0) {
	if (host->quirks & SDHCI_QUIRK_BROKEN_R1B)
	return 0;
	else {
	printf("%s: Timeout for status update!\n", __func__);
	return TIMEOUT;
	}
	}

	if ((stat & (SDHCI_INT_ERROR \| mask)) == mask) {
	sdhci_cmd_done(host, cmd);
	sdhci_writel(host, mask, SDHCI_INT_STATUS);
	} else
	ret = -1;

	if (!ret && data)
	ret = sdhci_transfer_data(host, data, start_addr);

	if (host->quirks & SDHCI_QUIRK_WAIT_SEND_CMD)
	udelay(1000);

	stat = sdhci_readl(host, SDHCI_INT_STATUS);
	sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
	if (!ret) {
	if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
	!is_aligned && (data->flags == MMC_DATA_READ))
	memcpy(data->dest, aligned_buffer, trans_bytes);
	return 0;
	}

	sdhci_reset(host, SDHCI_RESET_CMD);
	sdhci_reset(host, SDHCI_RESET_DATA);
	if (stat & SDHCI_INT_TIMEOUT)
	return TIMEOUT;
	else
	return COMM_ERR;
	}

	static int sdhci_set_clock(struct mmc *mmc, unsigned int clock)
	{
	struct sdhci_host *host = mmc->priv;
	unsigned int div, clk, timeout;

	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);

	if (clock == 0)
	return 0;

	if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) {
	/* Version 3.00 divisors must be a multiple of 2. */
	if (mmc->cfg->f_max <= clock)
	div = 1;
	else {
	for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; div += 2) {
	if ((mmc->cfg->f_max / div) <= clock)
	break;
	}
	}
	} else {
	/* Version 2.00 divisors must be a power of 2. */
	for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
	if ((mmc->cfg->f_max / div) <= clock)
	break;
	}
	}
	div >>= 1;

	if (host->set_clock)
	host->set_clock(host->index, div);

	clk = (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
	clk \|= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
	<< SDHCI_DIVIDER_HI_SHIFT;
	clk \|= SDHCI_CLOCK_INT_EN;
	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);

	/* Wait max 20 ms */
	timeout = 20;
	while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
	& SDHCI_CLOCK_INT_STABLE)) {
	if (timeout == 0) {
	printf("%s: Internal clock never stabilised.\n",
	__func__);
	return -1;
	}
	timeout--;
	udelay(1000);
	}

	clk \|= SDHCI_CLOCK_CARD_EN;
	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
	return 0;
	}

	static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
	{
	u8 pwr = 0;

	if (power != (unsigned short)-1) {
	switch (1 << power) {
	case MMC_VDD_165_195:
	pwr = SDHCI_POWER_180;
	break;
	case MMC_VDD_29_30:
	case MMC_VDD_30_31:
	pwr = SDHCI_POWER_300;
	break;
	case MMC_VDD_32_33:
	case MMC_VDD_33_34:
	pwr = SDHCI_POWER_330;
	break;
	}
	}

	if (pwr == 0) {
	sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
	return;
	}

	if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
	sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);

	pwr \|= SDHCI_POWER_ON;

	sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
	}

	static void sdhci_set_ios(struct mmc *mmc)
	{
	u32 ctrl;
	struct sdhci_host *host = mmc->priv;

	if (host->set_control_reg)
	host->set_control_reg(host);

	if (mmc->clock != host->clock)
	sdhci_set_clock(mmc, mmc->clock);

	/* Set bus width */
	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
	if (mmc->bus_width == 8) {
	ctrl &= ~SDHCI_CTRL_4BITBUS;
	if ((SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) \|\|
	(host->quirks & SDHCI_QUIRK_USE_WIDE8))
	ctrl \|= SDHCI_CTRL_8BITBUS;
	} else {
	if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
	ctrl &= ~SDHCI_CTRL_8BITBUS;
	if (mmc->bus_width == 4)
	ctrl \|= SDHCI_CTRL_4BITBUS;
	else
	ctrl &= ~SDHCI_CTRL_4BITBUS;
	}

	if (mmc->clock > 26000000)
	ctrl \|= SDHCI_CTRL_HISPD;
	else
	ctrl &= ~SDHCI_CTRL_HISPD;

	if (host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)
	ctrl &= ~SDHCI_CTRL_HISPD;

	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
	}

	static int sdhci_init(struct mmc *mmc)
	{
	struct sdhci_host *host = mmc->priv;

	if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) && !aligned_buffer) {
	aligned_buffer = memalign(8, 512*1024);
	if (!aligned_buffer) {
	printf("%s: Aligned buffer alloc failed!!!\n",
	__func__);
	return -1;
	}
	}

	sdhci_set_power(host, fls(mmc->cfg->voltages) - 1);

	if (host->quirks & SDHCI_QUIRK_NO_CD) {
	unsigned int status;

	sdhci_writel(host, SDHCI_CTRL_CD_TEST_INS \| SDHCI_CTRL_CD_TEST,
	SDHCI_HOST_CONTROL);

	status = sdhci_readl(host, SDHCI_PRESENT_STATE);
	while ((!(status & SDHCI_CARD_PRESENT)) \|\|
	(!(status & SDHCI_CARD_STATE_STABLE)) \|\|
	(!(status & SDHCI_CARD_DETECT_PIN_LEVEL)))
	status = sdhci_readl(host, SDHCI_PRESENT_STATE);
	}

	/* Enable only interrupts served by the SD controller */
	sdhci_writel(host, SDHCI_INT_DATA_MASK \| SDHCI_INT_CMD_MASK,
	SDHCI_INT_ENABLE);
	/* Mask all sdhci interrupt sources */
	sdhci_writel(host, 0x0, SDHCI_SIGNAL_ENABLE);

	return 0;
	}


	static const struct mmc_ops sdhci_ops = {
	.send_cmd = sdhci_send_command,
	.set_ios = sdhci_set_ios,
	.init = sdhci_init,
	};

	int add_sdhci(struct sdhci_host *host, u32 max_clk, u32 min_clk)
	{
	unsigned int caps;

	host->cfg.name = host->name;
	host->cfg.ops = &sdhci_ops;

	caps = sdhci_readl(host, SDHCI_CAPABILITIES);
	#ifdef CONFIG_MMC_SDMA
	if (!(caps & SDHCI_CAN_DO_SDMA)) {
	printf("%s: Your controller doesn't support SDMA!!\n",
	__func__);
	return -1;
	}
	#endif

	if (max_clk)
	host->cfg.f_max = max_clk;
	else {
	if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
	host->cfg.f_max = (caps & SDHCI_CLOCK_V3_BASE_MASK)
	>> SDHCI_CLOCK_BASE_SHIFT;
	else
	host->cfg.f_max = (caps & SDHCI_CLOCK_BASE_MASK)
	>> SDHCI_CLOCK_BASE_SHIFT;
	host->cfg.f_max *= 1000000;
	}
	if (host->cfg.f_max == 0) {
	printf("%s: Hardware doesn't specify base clock frequency\n",
	__func__);
	return -1;
	}
	if (min_clk)
	host->cfg.f_min = min_clk;
	else {
	if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
	host->cfg.f_min = host->cfg.f_max /
	SDHCI_MAX_DIV_SPEC_300;
	else
	host->cfg.f_min = host->cfg.f_max /
	SDHCI_MAX_DIV_SPEC_200;
	}

	host->cfg.voltages = 0;
	if (caps & SDHCI_CAN_VDD_330)
	host->cfg.voltages \|= MMC_VDD_32_33 \| MMC_VDD_33_34;
	if (caps & SDHCI_CAN_VDD_300)
	host->cfg.voltages \|= MMC_VDD_29_30 \| MMC_VDD_30_31;
	if (caps & SDHCI_CAN_VDD_180)
	host->cfg.voltages \|= MMC_VDD_165_195;

	if (host->quirks & SDHCI_QUIRK_BROKEN_VOLTAGE)
	host->cfg.voltages \|= host->voltages;

	host->cfg.host_caps = MMC_MODE_HS \| MMC_MODE_HS_52MHz \| MMC_MODE_4BIT;
	if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) {
	if (caps & SDHCI_CAN_DO_8BIT)
	host->cfg.host_caps \|= MMC_MODE_8BIT;
	}
	if (host->host_caps)
	host->cfg.host_caps \|= host->host_caps;

	host->cfg.b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;

	sdhci_reset(host, SDHCI_RESET_ALL);

	host->mmc = mmc_create(&host->cfg, host);
	if (host->mmc == NULL) {
	printf("%s: mmc create fail!\n", __func__);
	return -1;
	}

	return 0;
	}