drivers/mmc/dw_mmc.c - uboot/armada - Git at Google

 /*
  * (C) Copyright 2012 SAMSUNG Electronics
  * Jaehoon Chung <jh80.chung@samsung.com>
  * Rajeshawari Shinde <rajeshwari.s@samsung.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of
  * the License, or (at your option) any later version.
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,  MA 02111-1307 USA
  *
  */

 #include <common.h>
 #include <malloc.h>
 #include <mmc.h>
 #include <dwmmc.h>
 #include <asm/arch/clk.h>
 #include <asm-generic/errno.h>

 #define PAGE_SIZE 4096

 static int dwmci_wait_reset(struct dwmci_host *host, u32 value)
 {
 	unsigned long timeout = 1000;
 	u32 ctrl;

 	dwmci_writel(host, DWMCI_CTRL, value);

 	while (timeout--) {
 		ctrl = dwmci_readl(host, DWMCI_CTRL);
 		if (!(ctrl & DWMCI_RESET_ALL))
 			return 1;
 	}
 	return 0;
 }

 static void dwmci_set_idma_desc(struct dwmci_idmac *idmac,
 		u32 desc0, u32 desc1, u32 desc2)
 {
 	struct dwmci_idmac *desc = idmac;

 	desc->flags = desc0;
 	desc->cnt = desc1;
 	desc->addr = desc2;
 	desc->next_addr = (unsigned int)desc + sizeof(struct dwmci_idmac);
 }

 static void dwmci_prepare_data(struct dwmci_host *host,
 		struct mmc_data *data)
 {
 	unsigned long ctrl;
 	unsigned int i = 0, flags, cnt, blk_cnt;
 	ulong data_start, data_end, start_addr;
 	ALLOC_CACHE_ALIGN_BUFFER(struct dwmci_idmac, cur_idmac, data->blocks);


 	blk_cnt = data->blocks;

 	dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);

 	data_start = (ulong)cur_idmac;
 	dwmci_writel(host, DWMCI_DBADDR, (unsigned int)cur_idmac);

 	if (data->flags == MMC_DATA_READ)
 		start_addr = (unsigned int)data->dest;
 	else
 		start_addr = (unsigned int)data->src;

 	do {
 		flags = DWMCI_IDMAC_OWN | DWMCI_IDMAC_CH ;
 		flags |= (i == 0) ? DWMCI_IDMAC_FS : 0;
 		if (blk_cnt <= 8) {
 			flags |= DWMCI_IDMAC_LD;
 			cnt = data->blocksize * blk_cnt;
 		} else
 			cnt = data->blocksize * 8;

 		dwmci_set_idma_desc(cur_idmac, flags, cnt,
 				start_addr + (i * PAGE_SIZE));

 		if(blk_cnt < 8)
 			break;
 		blk_cnt -= 8;
 		cur_idmac++;
 		i++;
 	} while(1);

 	data_end = (ulong)cur_idmac;
 	flush_dcache_range(data_start, data_end + ARCH_DMA_MINALIGN);

 	ctrl = dwmci_readl(host, DWMCI_CTRL);
 	ctrl |= DWMCI_IDMAC_EN | DWMCI_DMA_EN;
 	dwmci_writel(host, DWMCI_CTRL, ctrl);

 	ctrl = dwmci_readl(host, DWMCI_BMOD);
 	ctrl |= DWMCI_BMOD_IDMAC_FB | DWMCI_BMOD_IDMAC_EN;
 	dwmci_writel(host, DWMCI_BMOD, ctrl);

 	dwmci_writel(host, DWMCI_BLKSIZ, data->blocksize);
 	dwmci_writel(host, DWMCI_BYTCNT, data->blocksize * data->blocks);
 }

 static int dwmci_set_transfer_mode(struct dwmci_host *host,
 		struct mmc_data *data)
 {
 	unsigned long mode;

 	mode = DWMCI_CMD_DATA_EXP;
 	if (data->flags & MMC_DATA_WRITE)
 		mode |= DWMCI_CMD_RW;

 	return mode;
 }

 static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
 		struct mmc_data *data)
 {
 	struct dwmci_host *host = (struct dwmci_host *)mmc->priv;
 	int flags = 0, i;
 	unsigned int timeout = 100000;
 	u32 retry = 10000;
 	u32 mask, ctrl;

 	while (dwmci_readl(host, DWMCI_STATUS) & DWMCI_BUSY) {
 		if (timeout == 0) {
 			printf("Timeout on data busy\n");
 			return TIMEOUT;
 		}
 		timeout--;
 	}

 	dwmci_writel(host, DWMCI_RINTSTS, DWMCI_INTMSK_ALL);

 	if (data)
 		dwmci_prepare_data(host, data);


 	dwmci_writel(host, DWMCI_CMDARG, cmd->cmdarg);

 	if (data)
 		flags = dwmci_set_transfer_mode(host, data);

 	if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY))
 		return -1;

 	if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
 		flags |= DWMCI_CMD_ABORT_STOP;
 	else
 		flags |= DWMCI_CMD_PRV_DAT_WAIT;

 	if (cmd->resp_type & MMC_RSP_PRESENT) {
 		flags |= DWMCI_CMD_RESP_EXP;
 		if (cmd->resp_type & MMC_RSP_136)
 			flags |= DWMCI_CMD_RESP_LENGTH;
 	}

 	if (cmd->resp_type & MMC_RSP_CRC)
 		flags |= DWMCI_CMD_CHECK_CRC;

 	flags |= (cmd->cmdidx | DWMCI_CMD_START | DWMCI_CMD_USE_HOLD_REG);

 	debug("Sending CMD%d\n",cmd->cmdidx);

 	dwmci_writel(host, DWMCI_CMD, flags);

 	for (i = 0; i < retry; i++) {
 		mask = dwmci_readl(host, DWMCI_RINTSTS);
 		if (mask & DWMCI_INTMSK_CDONE) {
 			if (!data)
 				dwmci_writel(host, DWMCI_RINTSTS, mask);
 			break;
 		}
 	}

 	if (i == retry)
 		return TIMEOUT;

 	if (mask & DWMCI_INTMSK_RTO) {
 		debug("Response Timeout..\n");
 		return TIMEOUT;
 	} else if (mask & DWMCI_INTMSK_RE) {
 		debug("Response Error..\n");
 		return -1;
 	}


 	if (cmd->resp_type & MMC_RSP_PRESENT) {
 		if (cmd->resp_type & MMC_RSP_136) {
 			cmd->response[0] = dwmci_readl(host, DWMCI_RESP3);
 			cmd->response[1] = dwmci_readl(host, DWMCI_RESP2);
 			cmd->response[2] = dwmci_readl(host, DWMCI_RESP1);
 			cmd->response[3] = dwmci_readl(host, DWMCI_RESP0);
 		} else {
 			cmd->response[0] = dwmci_readl(host, DWMCI_RESP0);
 		}
 	}

 	if (data) {
 		do {
 			mask = dwmci_readl(host, DWMCI_RINTSTS);
 			if (mask & (DWMCI_DATA_ERR | DWMCI_DATA_TOUT)) {
 				debug("DATA ERROR!\n");
 				return -1;
 			}
 		} while (!(mask & DWMCI_INTMSK_DTO));

 		dwmci_writel(host, DWMCI_RINTSTS, mask);

 		ctrl = dwmci_readl(host, DWMCI_CTRL);
 		ctrl &= ~(DWMCI_DMA_EN);
 		dwmci_writel(host, DWMCI_CTRL, ctrl);
 	}

 	udelay(100);

 	return 0;
 }

 static int dwmci_setup_bus(struct dwmci_host *host, u32 freq)
 {
 	u32 div, status;
 	int timeout = 10000;
 	unsigned long sclk;

 	if (freq == host->clock)
 		return 0;

 	/*
 	 * If host->mmc_clk didn't define,
 	 * then assume that host->bus_hz is source clock value.
 	 * host->bus_hz should be set from user.
 	 */
 	if (host->mmc_clk)
 		sclk = host->mmc_clk(host->dev_index);
 	else if (host->bus_hz)
 		sclk = host->bus_hz;
 	else {
 		printf("Didn't get source clock value..\n");
 		return -EINVAL;
 	}

 	div = DIV_ROUND_UP(sclk, 2 * freq);

 	dwmci_writel(host, DWMCI_CLKENA, 0);
 	dwmci_writel(host, DWMCI_CLKSRC, 0);

 	dwmci_writel(host, DWMCI_CLKDIV, div);
 	dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT |
 			DWMCI_CMD_UPD_CLK | DWMCI_CMD_START);

 	do {
 		status = dwmci_readl(host, DWMCI_CMD);
 		if (timeout-- < 0) {
 			printf("TIMEOUT error!!\n");
 			return -ETIMEDOUT;
 		}
 	} while (status & DWMCI_CMD_START);

 	dwmci_writel(host, DWMCI_CLKENA, DWMCI_CLKEN_ENABLE |
 			DWMCI_CLKEN_LOW_PWR);

 	dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT |
 			DWMCI_CMD_UPD_CLK | DWMCI_CMD_START);

 	timeout = 10000;
 	do {
 		status = dwmci_readl(host, DWMCI_CMD);
 		if (timeout-- < 0) {
 			printf("TIMEOUT error!!\n");
 			return -ETIMEDOUT;
 		}
 	} while (status & DWMCI_CMD_START);

 	host->clock = freq;

 	return 0;
 }

 static void dwmci_set_ios(struct mmc *mmc)
 {
 	struct dwmci_host *host = (struct dwmci_host *)mmc->priv;
 	u32 ctype;

 	debug("Buswidth = %d, clock: %d\n",mmc->bus_width, mmc->clock);

 	dwmci_setup_bus(host, mmc->clock);
 	switch (mmc->bus_width) {
 	case 8:
 		ctype = DWMCI_CTYPE_8BIT;
 		break;
 	case 4:
 		ctype = DWMCI_CTYPE_4BIT;
 		break;
 	default:
 		ctype = DWMCI_CTYPE_1BIT;
 		break;
 	}

 	dwmci_writel(host, DWMCI_CTYPE, ctype);

 	if (host->clksel)
 		host->clksel(host);
 }

 static int dwmci_init(struct mmc *mmc)
 {
 	struct dwmci_host *host = (struct dwmci_host *)mmc->priv;
 	u32 fifo_size, fifoth_val;

 	dwmci_writel(host, DWMCI_PWREN, 1);

 	if (!dwmci_wait_reset(host, DWMCI_RESET_ALL)) {
 		debug("%s[%d] Fail-reset!!\n",__func__,__LINE__);
 		return -1;
 	}

 	dwmci_writel(host, DWMCI_RINTSTS, 0xFFFFFFFF);
 	dwmci_writel(host, DWMCI_INTMASK, 0);

 	dwmci_writel(host, DWMCI_TMOUT, 0xFFFFFFFF);

 	dwmci_writel(host, DWMCI_IDINTEN, 0);
 	dwmci_writel(host, DWMCI_BMOD, 1);

 	fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
 	if (host->fifoth_val)
 		fifoth_val = host->fifoth_val;
 	else
 		fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size/2 -1) |
 			TX_WMARK(fifo_size/2);
 	dwmci_writel(host, DWMCI_FIFOTH, fifoth_val);

 	dwmci_writel(host, DWMCI_CLKENA, 0);
 	dwmci_writel(host, DWMCI_CLKSRC, 0);

 	return 0;
 }

 int add_dwmci(struct dwmci_host *host, u32 max_clk, u32 min_clk)
 {
 	struct mmc *mmc;
 	int err = 0;

 	mmc = malloc(sizeof(struct mmc));
 	if (!mmc) {
 		printf("mmc malloc fail!\n");
 		return -1;
 	}

 	mmc->priv = host;
 	host->mmc = mmc;

 	sprintf(mmc->name, "%s", host->name);
 	mmc->send_cmd = dwmci_send_cmd;
 	mmc->set_ios = dwmci_set_ios;
 	mmc->init = dwmci_init;
 	mmc->f_min = min_clk;
 	mmc->f_max = max_clk;

 	mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;

 	mmc->host_caps = host->caps;

 	if (host->buswidth == 8) {
 		mmc->host_caps |= MMC_MODE_8BIT;
 		mmc->host_caps &= ~MMC_MODE_4BIT;
 	} else {
 		mmc->host_caps |= MMC_MODE_4BIT;
 		mmc->host_caps &= ~MMC_MODE_8BIT;
 	}
 	mmc->host_caps |= MMC_MODE_HS | MMC_MODE_HS_52MHz | MMC_MODE_HC;

 	err = mmc_register(mmc);

 	return err;
 }
	/*
	* (C) Copyright 2012 SAMSUNG Electronics
	* Jaehoon Chung <jh80.chung@samsung.com>
	* Rajeshawari Shinde <rajeshwari.s@samsung.com>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 of
	* the License, or (at your option) any later version.
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	*/

	#include <common.h>
	#include <malloc.h>
	#include <mmc.h>
	#include <dwmmc.h>
	#include <asm/arch/clk.h>
	#include <asm-generic/errno.h>

	#define PAGE_SIZE 4096

	static int dwmci_wait_reset(struct dwmci_host *host, u32 value)
	{
	unsigned long timeout = 1000;
	u32 ctrl;

	dwmci_writel(host, DWMCI_CTRL, value);

	while (timeout--) {
	ctrl = dwmci_readl(host, DWMCI_CTRL);
	if (!(ctrl & DWMCI_RESET_ALL))
	return 1;
	}
	return 0;
	}

	static void dwmci_set_idma_desc(struct dwmci_idmac *idmac,
	u32 desc0, u32 desc1, u32 desc2)
	{
	struct dwmci_idmac *desc = idmac;

	desc->flags = desc0;
	desc->cnt = desc1;
	desc->addr = desc2;
	desc->next_addr = (unsigned int)desc + sizeof(struct dwmci_idmac);
	}

	static void dwmci_prepare_data(struct dwmci_host *host,
	struct mmc_data *data)
	{
	unsigned long ctrl;
	unsigned int i = 0, flags, cnt, blk_cnt;
	ulong data_start, data_end, start_addr;
	ALLOC_CACHE_ALIGN_BUFFER(struct dwmci_idmac, cur_idmac, data->blocks);


	blk_cnt = data->blocks;

	dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);

	data_start = (ulong)cur_idmac;
	dwmci_writel(host, DWMCI_DBADDR, (unsigned int)cur_idmac);

	if (data->flags == MMC_DATA_READ)
	start_addr = (unsigned int)data->dest;
	else
	start_addr = (unsigned int)data->src;

	do {
	flags = DWMCI_IDMAC_OWN \| DWMCI_IDMAC_CH ;
	flags \|= (i == 0) ? DWMCI_IDMAC_FS : 0;
	if (blk_cnt <= 8) {
	flags \|= DWMCI_IDMAC_LD;
	cnt = data->blocksize * blk_cnt;
	} else
	cnt = data->blocksize * 8;

	dwmci_set_idma_desc(cur_idmac, flags, cnt,
	start_addr + (i * PAGE_SIZE));

	if(blk_cnt < 8)
	break;
	blk_cnt -= 8;
	cur_idmac++;
	i++;
	} while(1);

	data_end = (ulong)cur_idmac;
	flush_dcache_range(data_start, data_end + ARCH_DMA_MINALIGN);

	ctrl = dwmci_readl(host, DWMCI_CTRL);
	ctrl \|= DWMCI_IDMAC_EN \| DWMCI_DMA_EN;
	dwmci_writel(host, DWMCI_CTRL, ctrl);

	ctrl = dwmci_readl(host, DWMCI_BMOD);
	ctrl \|= DWMCI_BMOD_IDMAC_FB \| DWMCI_BMOD_IDMAC_EN;
	dwmci_writel(host, DWMCI_BMOD, ctrl);

	dwmci_writel(host, DWMCI_BLKSIZ, data->blocksize);
	dwmci_writel(host, DWMCI_BYTCNT, data->blocksize * data->blocks);
	}

	static int dwmci_set_transfer_mode(struct dwmci_host *host,
	struct mmc_data *data)
	{
	unsigned long mode;

	mode = DWMCI_CMD_DATA_EXP;
	if (data->flags & MMC_DATA_WRITE)
	mode \|= DWMCI_CMD_RW;

	return mode;
	}

	static int dwmci_send_cmd(struct mmc mmc, struct mmc_cmd cmd,
	struct mmc_data *data)
	{
	struct dwmci_host host = (struct dwmci_host )mmc->priv;
	int flags = 0, i;
	unsigned int timeout = 100000;
	u32 retry = 10000;
	u32 mask, ctrl;

	while (dwmci_readl(host, DWMCI_STATUS) & DWMCI_BUSY) {
	if (timeout == 0) {
	printf("Timeout on data busy\n");
	return TIMEOUT;
	}
	timeout--;
	}

	dwmci_writel(host, DWMCI_RINTSTS, DWMCI_INTMSK_ALL);

	if (data)
	dwmci_prepare_data(host, data);


	dwmci_writel(host, DWMCI_CMDARG, cmd->cmdarg);

	if (data)
	flags = dwmci_set_transfer_mode(host, data);

	if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY))
	return -1;

	if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
	flags \|= DWMCI_CMD_ABORT_STOP;
	else
	flags \|= DWMCI_CMD_PRV_DAT_WAIT;

	if (cmd->resp_type & MMC_RSP_PRESENT) {
	flags \|= DWMCI_CMD_RESP_EXP;
	if (cmd->resp_type & MMC_RSP_136)
	flags \|= DWMCI_CMD_RESP_LENGTH;
	}

	if (cmd->resp_type & MMC_RSP_CRC)
	flags \|= DWMCI_CMD_CHECK_CRC;

	flags \|= (cmd->cmdidx \| DWMCI_CMD_START \| DWMCI_CMD_USE_HOLD_REG);

	debug("Sending CMD%d\n",cmd->cmdidx);

	dwmci_writel(host, DWMCI_CMD, flags);

	for (i = 0; i < retry; i++) {
	mask = dwmci_readl(host, DWMCI_RINTSTS);
	if (mask & DWMCI_INTMSK_CDONE) {
	if (!data)
	dwmci_writel(host, DWMCI_RINTSTS, mask);
	break;
	}
	}

	if (i == retry)
	return TIMEOUT;

	if (mask & DWMCI_INTMSK_RTO) {
	debug("Response Timeout..\n");
	return TIMEOUT;
	} else if (mask & DWMCI_INTMSK_RE) {
	debug("Response Error..\n");
	return -1;
	}


	if (cmd->resp_type & MMC_RSP_PRESENT) {
	if (cmd->resp_type & MMC_RSP_136) {
	cmd->response[0] = dwmci_readl(host, DWMCI_RESP3);
	cmd->response[1] = dwmci_readl(host, DWMCI_RESP2);
	cmd->response[2] = dwmci_readl(host, DWMCI_RESP1);
	cmd->response[3] = dwmci_readl(host, DWMCI_RESP0);
	} else {
	cmd->response[0] = dwmci_readl(host, DWMCI_RESP0);
	}
	}

	if (data) {
	do {
	mask = dwmci_readl(host, DWMCI_RINTSTS);
	if (mask & (DWMCI_DATA_ERR \| DWMCI_DATA_TOUT)) {
	debug("DATA ERROR!\n");
	return -1;
	}
	} while (!(mask & DWMCI_INTMSK_DTO));

	dwmci_writel(host, DWMCI_RINTSTS, mask);

	ctrl = dwmci_readl(host, DWMCI_CTRL);
	ctrl &= ~(DWMCI_DMA_EN);
	dwmci_writel(host, DWMCI_CTRL, ctrl);
	}

	udelay(100);

	return 0;
	}

	static int dwmci_setup_bus(struct dwmci_host *host, u32 freq)
	{
	u32 div, status;
	int timeout = 10000;
	unsigned long sclk;

	if (freq == host->clock)
	return 0;

	/*
	* If host->mmc_clk didn't define,
	* then assume that host->bus_hz is source clock value.
	* host->bus_hz should be set from user.
	*/
	if (host->mmc_clk)
	sclk = host->mmc_clk(host->dev_index);
	else if (host->bus_hz)
	sclk = host->bus_hz;
	else {
	printf("Didn't get source clock value..\n");
	return -EINVAL;
	}

	div = DIV_ROUND_UP(sclk, 2 * freq);

	dwmci_writel(host, DWMCI_CLKENA, 0);
	dwmci_writel(host, DWMCI_CLKSRC, 0);

	dwmci_writel(host, DWMCI_CLKDIV, div);
	dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT \|
	DWMCI_CMD_UPD_CLK \| DWMCI_CMD_START);

	do {
	status = dwmci_readl(host, DWMCI_CMD);
	if (timeout-- < 0) {
	printf("TIMEOUT error!!\n");
	return -ETIMEDOUT;
	}
	} while (status & DWMCI_CMD_START);

	dwmci_writel(host, DWMCI_CLKENA, DWMCI_CLKEN_ENABLE \|
	DWMCI_CLKEN_LOW_PWR);

	dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT \|
	DWMCI_CMD_UPD_CLK \| DWMCI_CMD_START);

	timeout = 10000;
	do {
	status = dwmci_readl(host, DWMCI_CMD);
	if (timeout-- < 0) {
	printf("TIMEOUT error!!\n");
	return -ETIMEDOUT;
	}
	} while (status & DWMCI_CMD_START);

	host->clock = freq;

	return 0;
	}

	static void dwmci_set_ios(struct mmc *mmc)
	{
	struct dwmci_host host = (struct dwmci_host )mmc->priv;
	u32 ctype;

	debug("Buswidth = %d, clock: %d\n",mmc->bus_width, mmc->clock);

	dwmci_setup_bus(host, mmc->clock);
	switch (mmc->bus_width) {
	case 8:
	ctype = DWMCI_CTYPE_8BIT;
	break;
	case 4:
	ctype = DWMCI_CTYPE_4BIT;
	break;
	default:
	ctype = DWMCI_CTYPE_1BIT;
	break;
	}

	dwmci_writel(host, DWMCI_CTYPE, ctype);

	if (host->clksel)
	host->clksel(host);
	}

	static int dwmci_init(struct mmc *mmc)
	{
	struct dwmci_host host = (struct dwmci_host )mmc->priv;
	u32 fifo_size, fifoth_val;

	dwmci_writel(host, DWMCI_PWREN, 1);

	if (!dwmci_wait_reset(host, DWMCI_RESET_ALL)) {
	debug("%s[%d] Fail-reset!!\n",__func__,__LINE__);
	return -1;
	}

	dwmci_writel(host, DWMCI_RINTSTS, 0xFFFFFFFF);
	dwmci_writel(host, DWMCI_INTMASK, 0);

	dwmci_writel(host, DWMCI_TMOUT, 0xFFFFFFFF);

	dwmci_writel(host, DWMCI_IDINTEN, 0);
	dwmci_writel(host, DWMCI_BMOD, 1);

	fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
	if (host->fifoth_val)
	fifoth_val = host->fifoth_val;
	else
	fifoth_val = MSIZE(0x2) \| RX_WMARK(fifo_size/2 -1) \|
	TX_WMARK(fifo_size/2);
	dwmci_writel(host, DWMCI_FIFOTH, fifoth_val);

	dwmci_writel(host, DWMCI_CLKENA, 0);
	dwmci_writel(host, DWMCI_CLKSRC, 0);

	return 0;
	}

	int add_dwmci(struct dwmci_host *host, u32 max_clk, u32 min_clk)
	{
	struct mmc *mmc;
	int err = 0;

	mmc = malloc(sizeof(struct mmc));
	if (!mmc) {
	printf("mmc malloc fail!\n");
	return -1;
	}

	mmc->priv = host;
	host->mmc = mmc;

	sprintf(mmc->name, "%s", host->name);
	mmc->send_cmd = dwmci_send_cmd;
	mmc->set_ios = dwmci_set_ios;
	mmc->init = dwmci_init;
	mmc->f_min = min_clk;
	mmc->f_max = max_clk;

	mmc->voltages = MMC_VDD_32_33 \| MMC_VDD_33_34 \| MMC_VDD_165_195;

	mmc->host_caps = host->caps;

	if (host->buswidth == 8) {
	mmc->host_caps \|= MMC_MODE_8BIT;
	mmc->host_caps &= ~MMC_MODE_4BIT;
	} else {
	mmc->host_caps \|= MMC_MODE_4BIT;
	mmc->host_caps &= ~MMC_MODE_8BIT;
	}
	mmc->host_caps \|= MMC_MODE_HS \| MMC_MODE_HS_52MHz \| MMC_MODE_HC;

	err = mmc_register(mmc);

	return err;
	}