drivers/mmc/sh_mmcif.c - platform/external/u-boot - Gitiles

 /*
  * MMCIF driver.
  *
  * Copyright (C)  2011 Renesas Solutions Corp.
  *
  * 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.
  */

 #include <config.h>
 #include <common.h>
 #include <watchdog.h>
 #include <command.h>
 #include <mmc.h>
 #include <malloc.h>
 #include <asm/errno.h>
 #include <asm/io.h>
 #include "sh_mmcif.h"

 #define DRIVER_NAME	"sh_mmcif"

 static void *mmc_priv(struct mmc *mmc)
 {
 	return (void *)mmc->priv;
 }

 static int sh_mmcif_intr(void *dev_id)
 {
 	struct sh_mmcif_host *host = dev_id;
 	u32 state = 0;

 	state = sh_mmcif_read(&host->regs->ce_int);
 	state &= sh_mmcif_read(&host->regs->ce_int_mask);

 	if (state & INT_RBSYE) {
 		sh_mmcif_write(~(INT_RBSYE | INT_CRSPE), &host->regs->ce_int);
 		sh_mmcif_bitclr(MASK_MRBSYE, &host->regs->ce_int_mask);
 		goto end;
 	} else if (state & INT_CRSPE) {
 		sh_mmcif_write(~INT_CRSPE, &host->regs->ce_int);
 		sh_mmcif_bitclr(MASK_MCRSPE, &host->regs->ce_int_mask);
 		/* one more interrupt (INT_RBSYE) */
 		if (sh_mmcif_read(&host->regs->ce_cmd_set) & CMD_SET_RBSY)
 			return -EAGAIN;
 		goto end;
 	} else if (state & INT_BUFREN) {
 		sh_mmcif_write(~INT_BUFREN, &host->regs->ce_int);
 		sh_mmcif_bitclr(MASK_MBUFREN, &host->regs->ce_int_mask);
 		goto end;
 	} else if (state & INT_BUFWEN) {
 		sh_mmcif_write(~INT_BUFWEN, &host->regs->ce_int);
 		sh_mmcif_bitclr(MASK_MBUFWEN, &host->regs->ce_int_mask);
 		goto end;
 	} else if (state & INT_CMD12DRE) {
 		sh_mmcif_write(~(INT_CMD12DRE | INT_CMD12RBE | INT_CMD12CRE |
 				  INT_BUFRE), &host->regs->ce_int);
 		sh_mmcif_bitclr(MASK_MCMD12DRE, &host->regs->ce_int_mask);
 		goto end;
 	} else if (state & INT_BUFRE) {
 		sh_mmcif_write(~INT_BUFRE, &host->regs->ce_int);
 		sh_mmcif_bitclr(MASK_MBUFRE, &host->regs->ce_int_mask);
 		goto end;
 	} else if (state & INT_DTRANE) {
 		sh_mmcif_write(~INT_DTRANE, &host->regs->ce_int);
 		sh_mmcif_bitclr(MASK_MDTRANE, &host->regs->ce_int_mask);
 		goto end;
 	} else if (state & INT_CMD12RBE) {
 		sh_mmcif_write(~(INT_CMD12RBE | INT_CMD12CRE),
 				&host->regs->ce_int);
 		sh_mmcif_bitclr(MASK_MCMD12RBE, &host->regs->ce_int_mask);
 		goto end;
 	} else if (state & INT_ERR_STS) {
 		/* err interrupts */
 		sh_mmcif_write(~state, &host->regs->ce_int);
 		sh_mmcif_bitclr(state, &host->regs->ce_int_mask);
 		goto err;
 	} else
 		return -EAGAIN;

 err:
 	host->sd_error = 1;
 	debug("%s: int err state = %08x\n", DRIVER_NAME, state);
 end:
 	host->wait_int = 1;
 	return 0;
 }

 static int mmcif_wait_interrupt_flag(struct sh_mmcif_host *host)
 {
 	int timeout = 10000000;

 	while (1) {
 		timeout--;
 		if (timeout < 0) {
 			printf("timeout\n");
 			return 0;
 		}

 		if (!sh_mmcif_intr(host))
 			break;

 		udelay(1);	/* 1 usec */
 	}

 	return 1;	/* Return value: NOT 0 = complete waiting */
 }

 static void sh_mmcif_clock_control(struct sh_mmcif_host *host, unsigned int clk)
 {
 	int i;

 	sh_mmcif_bitclr(CLK_ENABLE, &host->regs->ce_clk_ctrl);
 	sh_mmcif_bitclr(CLK_CLEAR, &host->regs->ce_clk_ctrl);

 	if (!clk)
 		return;
 	if (clk == CLKDEV_EMMC_DATA) {
 		sh_mmcif_bitset(CLK_PCLK, &host->regs->ce_clk_ctrl);
 	} else {
 		for (i = 1; (unsigned int)host->clk / (1 << i) >= clk; i++)
 			;
 		sh_mmcif_bitset((i - 1) << 16, &host->regs->ce_clk_ctrl);
 	}
 	sh_mmcif_bitset(CLK_ENABLE, &host->regs->ce_clk_ctrl);
 }

 static void sh_mmcif_sync_reset(struct sh_mmcif_host *host)
 {
 	u32 tmp;

 	tmp = sh_mmcif_read(&host->regs->ce_clk_ctrl) & (CLK_ENABLE |
 							 CLK_CLEAR);

 	sh_mmcif_write(SOFT_RST_ON, &host->regs->ce_version);
 	sh_mmcif_write(SOFT_RST_OFF, &host->regs->ce_version);
 	sh_mmcif_bitset(tmp | SRSPTO_256 | SRBSYTO_29 | SRWDTO_29 | SCCSTO_29,
 			&host->regs->ce_clk_ctrl);
 	/* byte swap on */
 	sh_mmcif_bitset(BUF_ACC_ATYP, &host->regs->ce_buf_acc);
 }

 static int sh_mmcif_error_manage(struct sh_mmcif_host *host)
 {
 	u32 state1, state2;
 	int ret, timeout = 10000000;

 	host->sd_error = 0;
 	host->wait_int = 0;

 	state1 = sh_mmcif_read(&host->regs->ce_host_sts1);
 	state2 = sh_mmcif_read(&host->regs->ce_host_sts2);
 	debug("%s: ERR HOST_STS1 = %08x\n", \
 			DRIVER_NAME, sh_mmcif_read(&host->regs->ce_host_sts1));
 	debug("%s: ERR HOST_STS2 = %08x\n", \
 			DRIVER_NAME, sh_mmcif_read(&host->regs->ce_host_sts2));

 	if (state1 & STS1_CMDSEQ) {
 		debug("%s: Forced end of command sequence\n", DRIVER_NAME);
 		sh_mmcif_bitset(CMD_CTRL_BREAK, &host->regs->ce_cmd_ctrl);
 		sh_mmcif_bitset(~CMD_CTRL_BREAK, &host->regs->ce_cmd_ctrl);
 		while (1) {
 			timeout--;
 			if (timeout < 0) {
 				printf(DRIVER_NAME": Forceed end of " \
 					"command sequence timeout err\n");
 				return -EILSEQ;
 			}
 			if (!(sh_mmcif_read(&host->regs->ce_host_sts1)
 								& STS1_CMDSEQ))
 				break;
 		}
 		sh_mmcif_sync_reset(host);
 		return -EILSEQ;
 	}

 	if (state2 & STS2_CRC_ERR)
 		ret = -EILSEQ;
 	else if (state2 & STS2_TIMEOUT_ERR)
 		ret = TIMEOUT;
 	else
 		ret = -EILSEQ;
 	return ret;
 }

 static int sh_mmcif_single_read(struct sh_mmcif_host *host,
 				struct mmc_data *data)
 {
 	long time;
 	u32 blocksize, i;
 	unsigned long *p = (unsigned long *)data->dest;

 	if ((unsigned long)p & 0x00000001) {
 		printf("%s: The data pointer is unaligned.", __func__);
 		return -EIO;
 	}

 	host->wait_int = 0;

 	/* buf read enable */
 	sh_mmcif_bitset(MASK_MBUFREN, &host->regs->ce_int_mask);
 	time = mmcif_wait_interrupt_flag(host);
 	if (time == 0 || host->sd_error != 0)
 		return sh_mmcif_error_manage(host);

 	host->wait_int = 0;
 	blocksize = (BLOCK_SIZE_MASK &
 			sh_mmcif_read(&host->regs->ce_block_set)) + 3;
 	for (i = 0; i < blocksize / 4; i++)
 		*p++ = sh_mmcif_read(&host->regs->ce_data);

 	/* buffer read end */
 	sh_mmcif_bitset(MASK_MBUFRE, &host->regs->ce_int_mask);
 	time = mmcif_wait_interrupt_flag(host);
 	if (time == 0 || host->sd_error != 0)
 		return sh_mmcif_error_manage(host);

 	host->wait_int = 0;
 	return 0;
 }

 static int sh_mmcif_multi_read(struct sh_mmcif_host *host,
 				struct mmc_data *data)
 {
 	long time;
 	u32 blocksize, i, j;
 	unsigned long *p = (unsigned long *)data->dest;

 	if ((unsigned long)p & 0x00000001) {
 		printf("%s: The data pointer is unaligned.", __func__);
 		return -EIO;
 	}

 	host->wait_int = 0;
 	blocksize = BLOCK_SIZE_MASK & sh_mmcif_read(&host->regs->ce_block_set);
 	for (j = 0; j < data->blocks; j++) {
 		sh_mmcif_bitset(MASK_MBUFREN, &host->regs->ce_int_mask);
 		time = mmcif_wait_interrupt_flag(host);
 		if (time == 0 || host->sd_error != 0)
 			return sh_mmcif_error_manage(host);

 		host->wait_int = 0;
 		for (i = 0; i < blocksize / 4; i++)
 			*p++ = sh_mmcif_read(&host->regs->ce_data);

 		WATCHDOG_RESET();
 	}
 	return 0;
 }

 static int sh_mmcif_single_write(struct sh_mmcif_host *host,
 				 struct mmc_data *data)
 {
 	long time;
 	u32 blocksize, i;
 	const unsigned long *p = (unsigned long *)data->dest;

 	if ((unsigned long)p & 0x00000001) {
 		printf("%s: The data pointer is unaligned.", __func__);
 		return -EIO;
 	}

 	host->wait_int = 0;
 	sh_mmcif_bitset(MASK_MBUFWEN, &host->regs->ce_int_mask);

 	time = mmcif_wait_interrupt_flag(host);
 	if (time == 0 || host->sd_error != 0)
 		return sh_mmcif_error_manage(host);

 	host->wait_int = 0;
 	blocksize = (BLOCK_SIZE_MASK &
 			sh_mmcif_read(&host->regs->ce_block_set)) + 3;
 	for (i = 0; i < blocksize / 4; i++)
 		sh_mmcif_write(*p++, &host->regs->ce_data);

 	/* buffer write end */
 	sh_mmcif_bitset(MASK_MDTRANE, &host->regs->ce_int_mask);

 	time = mmcif_wait_interrupt_flag(host);
 	if (time == 0 || host->sd_error != 0)
 		return sh_mmcif_error_manage(host);

 	host->wait_int = 0;
 	return 0;
 }

 static int sh_mmcif_multi_write(struct sh_mmcif_host *host,
 				struct mmc_data *data)
 {
 	long time;
 	u32 i, j, blocksize;
 	const unsigned long *p = (unsigned long *)data->dest;

 	if ((unsigned long)p & 0x00000001) {
 		printf("%s: The data pointer is unaligned.", __func__);
 		return -EIO;
 	}

 	host->wait_int = 0;
 	blocksize = BLOCK_SIZE_MASK & sh_mmcif_read(&host->regs->ce_block_set);
 	for (j = 0; j < data->blocks; j++) {
 		sh_mmcif_bitset(MASK_MBUFWEN, &host->regs->ce_int_mask);

 		time = mmcif_wait_interrupt_flag(host);

 		if (time == 0 || host->sd_error != 0)
 			return sh_mmcif_error_manage(host);

 		host->wait_int = 0;
 		for (i = 0; i < blocksize / 4; i++)
 			sh_mmcif_write(*p++, &host->regs->ce_data);

 		WATCHDOG_RESET();
 	}
 	return 0;
 }

 static void sh_mmcif_get_response(struct sh_mmcif_host *host,
 					struct mmc_cmd *cmd)
 {
 	if (cmd->resp_type & MMC_RSP_136) {
 		cmd->response[0] = sh_mmcif_read(&host->regs->ce_resp3);
 		cmd->response[1] = sh_mmcif_read(&host->regs->ce_resp2);
 		cmd->response[2] = sh_mmcif_read(&host->regs->ce_resp1);
 		cmd->response[3] = sh_mmcif_read(&host->regs->ce_resp0);
 		debug(" RESP %08x, %08x, %08x, %08x\n", cmd->response[0],
 			 cmd->response[1], cmd->response[2], cmd->response[3]);
 	} else {
 		cmd->response[0] = sh_mmcif_read(&host->regs->ce_resp0);
 	}
 }

 static void sh_mmcif_get_cmd12response(struct sh_mmcif_host *host,
 					struct mmc_cmd *cmd)
 {
 	cmd->response[0] = sh_mmcif_read(&host->regs->ce_resp_cmd12);
 }

 static u32 sh_mmcif_set_cmd(struct sh_mmcif_host *host,
 				struct mmc_data *data, struct mmc_cmd *cmd)
 {
 	u32 tmp = 0;
 	u32 opc = cmd->cmdidx;

 	/* Response Type check */
 	switch (cmd->resp_type) {
 	case MMC_RSP_NONE:
 		tmp |= CMD_SET_RTYP_NO;
 		break;
 	case MMC_RSP_R1:
 	case MMC_RSP_R1b:
 	case MMC_RSP_R3:
 		tmp |= CMD_SET_RTYP_6B;
 		break;
 	case MMC_RSP_R2:
 		tmp |= CMD_SET_RTYP_17B;
 		break;
 	default:
 		printf(DRIVER_NAME": Not support type response.\n");
 		break;
 	}

 	/* RBSY */
 	if (opc == MMC_CMD_SWITCH)
 		tmp |= CMD_SET_RBSY;

 	/* WDAT / DATW */
 	if (host->data) {
 		tmp |= CMD_SET_WDAT;
 		switch (host->bus_width) {
 		case MMC_BUS_WIDTH_1:
 			tmp |= CMD_SET_DATW_1;
 			break;
 		case MMC_BUS_WIDTH_4:
 			tmp |= CMD_SET_DATW_4;
 			break;
 		case MMC_BUS_WIDTH_8:
 			tmp |= CMD_SET_DATW_8;
 			break;
 		default:
 			printf(DRIVER_NAME": Not support bus width.\n");
 			break;
 		}
 	}
 	/* DWEN */
 	if (opc == MMC_CMD_WRITE_SINGLE_BLOCK ||
 	    opc == MMC_CMD_WRITE_MULTIPLE_BLOCK)
 		tmp |= CMD_SET_DWEN;
 	/* CMLTE/CMD12EN */
 	if (opc == MMC_CMD_READ_MULTIPLE_BLOCK ||
 	    opc == MMC_CMD_WRITE_MULTIPLE_BLOCK) {
 		tmp |= CMD_SET_CMLTE | CMD_SET_CMD12EN;
 		sh_mmcif_bitset(data->blocks << 16, &host->regs->ce_block_set);
 	}
 	/* RIDXC[1:0] check bits */
 	if (opc == MMC_CMD_SEND_OP_COND || opc == MMC_CMD_ALL_SEND_CID ||
 	    opc == MMC_CMD_SEND_CSD || opc == MMC_CMD_SEND_CID)
 		tmp |= CMD_SET_RIDXC_BITS;
 	/* RCRC7C[1:0] check bits */
 	if (opc == MMC_CMD_SEND_OP_COND)
 		tmp |= CMD_SET_CRC7C_BITS;
 	/* RCRC7C[1:0] internal CRC7 */
 	if (opc == MMC_CMD_ALL_SEND_CID ||
 		opc == MMC_CMD_SEND_CSD || opc == MMC_CMD_SEND_CID)
 		tmp |= CMD_SET_CRC7C_INTERNAL;

 	return opc = ((opc << 24) | tmp);
 }

 static u32 sh_mmcif_data_trans(struct sh_mmcif_host *host,
 				struct mmc_data *data, u16 opc)
 {
 	u32 ret;

 	switch (opc) {
 	case MMC_CMD_READ_MULTIPLE_BLOCK:
 		ret = sh_mmcif_multi_read(host, data);
 		break;
 	case MMC_CMD_WRITE_MULTIPLE_BLOCK:
 		ret = sh_mmcif_multi_write(host, data);
 		break;
 	case MMC_CMD_WRITE_SINGLE_BLOCK:
 		ret = sh_mmcif_single_write(host, data);
 		break;
 	case MMC_CMD_READ_SINGLE_BLOCK:
 	case MMC_CMD_SEND_EXT_CSD:
 		ret = sh_mmcif_single_read(host, data);
 		break;
 	default:
 		printf(DRIVER_NAME": NOT SUPPORT CMD = d'%08d\n", opc);
 		ret = -EINVAL;
 		break;
 	}
 	return ret;
 }

 static int sh_mmcif_start_cmd(struct sh_mmcif_host *host,
 				struct mmc_data *data, struct mmc_cmd *cmd)
 {
 	long time;
 	int ret = 0, mask = 0;
 	u32 opc = cmd->cmdidx;

 	if (opc == MMC_CMD_STOP_TRANSMISSION) {
 		/* MMCIF sends the STOP command automatically */
 		if (host->last_cmd == MMC_CMD_READ_MULTIPLE_BLOCK)
 			sh_mmcif_bitset(MASK_MCMD12DRE,
 					&host->regs->ce_int_mask);
 		else
 			sh_mmcif_bitset(MASK_MCMD12RBE,
 					&host->regs->ce_int_mask);

 		time = mmcif_wait_interrupt_flag(host);
 		if (time == 0 || host->sd_error != 0)
 			return sh_mmcif_error_manage(host);

 		sh_mmcif_get_cmd12response(host, cmd);
 		return 0;
 	}
 	if (opc == MMC_CMD_SWITCH)
 		mask = MASK_MRBSYE;
 	else
 		mask = MASK_MCRSPE;

 	mask |=	MASK_MCMDVIO | MASK_MBUFVIO | MASK_MWDATERR |
 		MASK_MRDATERR | MASK_MRIDXERR | MASK_MRSPERR |
 		MASK_MCCSTO | MASK_MCRCSTO | MASK_MWDATTO |
 		MASK_MRDATTO | MASK_MRBSYTO | MASK_MRSPTO;

 	if (host->data) {
 		sh_mmcif_write(0, &host->regs->ce_block_set);
 		sh_mmcif_write(data->blocksize, &host->regs->ce_block_set);
 	}
 	opc = sh_mmcif_set_cmd(host, data, cmd);

 	sh_mmcif_write(INT_START_MAGIC, &host->regs->ce_int);
 	sh_mmcif_write(mask, &host->regs->ce_int_mask);

 	debug("CMD%d ARG:%08x\n", cmd->cmdidx, cmd->cmdarg);
 	/* set arg */
 	sh_mmcif_write(cmd->cmdarg, &host->regs->ce_arg);
 	host->wait_int = 0;
 	/* set cmd */
 	sh_mmcif_write(opc, &host->regs->ce_cmd_set);

 	time = mmcif_wait_interrupt_flag(host);
 	if (time == 0)
 		return sh_mmcif_error_manage(host);

 	if (host->sd_error) {
 		switch (cmd->cmdidx) {
 		case MMC_CMD_ALL_SEND_CID:
 		case MMC_CMD_SELECT_CARD:
 		case MMC_CMD_APP_CMD:
 			ret = TIMEOUT;
 			break;
 		default:
 			printf(DRIVER_NAME": Cmd(d'%d) err\n", cmd->cmdidx);
 			ret = sh_mmcif_error_manage(host);
 			break;
 		}
 		host->sd_error = 0;
 		host->wait_int = 0;
 		return ret;
 	}

 	/* if no response */
 	if (!(opc & 0x00C00000))
 		return 0;

 	if (host->wait_int == 1) {
 		sh_mmcif_get_response(host, cmd);
 		host->wait_int = 0;
 	}
 	if (host->data)
 		ret = sh_mmcif_data_trans(host, data, cmd->cmdidx);
 	host->last_cmd = cmd->cmdidx;

 	return ret;
 }

 static int sh_mmcif_request(struct mmc *mmc, struct mmc_cmd *cmd,
 			    struct mmc_data *data)
 {
 	struct sh_mmcif_host *host = mmc_priv(mmc);
 	int ret;

 	WATCHDOG_RESET();

 	switch (cmd->cmdidx) {
 	case MMC_CMD_APP_CMD:
 		return TIMEOUT;
 	case MMC_CMD_SEND_EXT_CSD: /* = SD_SEND_IF_COND (8) */
 		if (data)
 			/* ext_csd */
 			break;
 		else
 			/* send_if_cond cmd (not support) */
 			return TIMEOUT;
 	default:
 		break;
 	}
 	host->sd_error = 0;
 	host->data = data;
 	ret = sh_mmcif_start_cmd(host, data, cmd);
 	host->data = NULL;

 	return ret;
 }

 static void sh_mmcif_set_ios(struct mmc *mmc)
 {
 	struct sh_mmcif_host *host = mmc_priv(mmc);

 	if (mmc->clock)
 		sh_mmcif_clock_control(host, mmc->clock);

 	if (mmc->bus_width == 8)
 		host->bus_width = MMC_BUS_WIDTH_8;
 	else if (mmc->bus_width == 4)
 		host->bus_width = MMC_BUS_WIDTH_4;
 	else
 		host->bus_width = MMC_BUS_WIDTH_1;

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

 static int sh_mmcif_init(struct mmc *mmc)
 {
 	struct sh_mmcif_host *host = mmc_priv(mmc);

 	sh_mmcif_sync_reset(host);
 	sh_mmcif_write(MASK_ALL, &host->regs->ce_int_mask);
 	return 0;
 }

 int mmcif_mmc_init(void)
 {
 	int ret = 0;
 	struct mmc *mmc;
 	struct sh_mmcif_host *host = NULL;

 	mmc = malloc(sizeof(struct mmc));
 	if (!mmc)
 		ret = -ENOMEM;
 	memset(mmc, 0, sizeof(*mmc));
 	host = malloc(sizeof(struct sh_mmcif_host));
 	if (!host)
 		ret = -ENOMEM;
 	memset(host, 0, sizeof(*host));

 	mmc->f_min = CLKDEV_MMC_INIT;
 	mmc->f_max = CLKDEV_EMMC_DATA;
 	mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
 	mmc->host_caps = MMC_MODE_HS | MMC_MODE_HS_52MHz | MMC_MODE_4BIT |
 			 MMC_MODE_8BIT | MMC_MODE_HC;
 	memcpy(mmc->name, DRIVER_NAME, sizeof(DRIVER_NAME));
 	mmc->send_cmd = sh_mmcif_request;
 	mmc->set_ios = sh_mmcif_set_ios;
 	mmc->init = sh_mmcif_init;
 	mmc->getcd = NULL;
 	host->regs = (struct sh_mmcif_regs *)CONFIG_SH_MMCIF_ADDR;
 	host->clk = CONFIG_SH_MMCIF_CLK;
 	mmc->priv = host;

 	mmc_register(mmc);

 	return ret;
 }
	/*
	* MMCIF driver.
	*
	* Copyright (C) 2011 Renesas Solutions Corp.
	*
	* 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.
	*/

	#include <config.h>
	#include <common.h>
	#include <watchdog.h>
	#include <command.h>
	#include <mmc.h>
	#include <malloc.h>
	#include <asm/errno.h>
	#include <asm/io.h>
	#include "sh_mmcif.h"

	#define DRIVER_NAME "sh_mmcif"

	static void mmc_priv(struct mmc mmc)
	{
	return (void *)mmc->priv;
	}

	static int sh_mmcif_intr(void *dev_id)
	{
	struct sh_mmcif_host *host = dev_id;
	u32 state = 0;

	state = sh_mmcif_read(&host->regs->ce_int);
	state &= sh_mmcif_read(&host->regs->ce_int_mask);

	if (state & INT_RBSYE) {
	sh_mmcif_write(~(INT_RBSYE \| INT_CRSPE), &host->regs->ce_int);
	sh_mmcif_bitclr(MASK_MRBSYE, &host->regs->ce_int_mask);
	goto end;
	} else if (state & INT_CRSPE) {
	sh_mmcif_write(~INT_CRSPE, &host->regs->ce_int);
	sh_mmcif_bitclr(MASK_MCRSPE, &host->regs->ce_int_mask);
	/* one more interrupt (INT_RBSYE) */
	if (sh_mmcif_read(&host->regs->ce_cmd_set) & CMD_SET_RBSY)
	return -EAGAIN;
	goto end;
	} else if (state & INT_BUFREN) {
	sh_mmcif_write(~INT_BUFREN, &host->regs->ce_int);
	sh_mmcif_bitclr(MASK_MBUFREN, &host->regs->ce_int_mask);
	goto end;
	} else if (state & INT_BUFWEN) {
	sh_mmcif_write(~INT_BUFWEN, &host->regs->ce_int);
	sh_mmcif_bitclr(MASK_MBUFWEN, &host->regs->ce_int_mask);
	goto end;
	} else if (state & INT_CMD12DRE) {
	sh_mmcif_write(~(INT_CMD12DRE \| INT_CMD12RBE \| INT_CMD12CRE \|
	INT_BUFRE), &host->regs->ce_int);
	sh_mmcif_bitclr(MASK_MCMD12DRE, &host->regs->ce_int_mask);
	goto end;
	} else if (state & INT_BUFRE) {
	sh_mmcif_write(~INT_BUFRE, &host->regs->ce_int);
	sh_mmcif_bitclr(MASK_MBUFRE, &host->regs->ce_int_mask);
	goto end;
	} else if (state & INT_DTRANE) {
	sh_mmcif_write(~INT_DTRANE, &host->regs->ce_int);
	sh_mmcif_bitclr(MASK_MDTRANE, &host->regs->ce_int_mask);
	goto end;
	} else if (state & INT_CMD12RBE) {
	sh_mmcif_write(~(INT_CMD12RBE \| INT_CMD12CRE),
	&host->regs->ce_int);
	sh_mmcif_bitclr(MASK_MCMD12RBE, &host->regs->ce_int_mask);
	goto end;
	} else if (state & INT_ERR_STS) {
	/* err interrupts */
	sh_mmcif_write(~state, &host->regs->ce_int);
	sh_mmcif_bitclr(state, &host->regs->ce_int_mask);
	goto err;
	} else
	return -EAGAIN;

	err:
	host->sd_error = 1;
	debug("%s: int err state = %08x\n", DRIVER_NAME, state);
	end:
	host->wait_int = 1;
	return 0;
	}

	static int mmcif_wait_interrupt_flag(struct sh_mmcif_host *host)
	{
	int timeout = 10000000;

	while (1) {
	timeout--;
	if (timeout < 0) {
	printf("timeout\n");
	return 0;
	}

	if (!sh_mmcif_intr(host))
	break;

	udelay(1); /* 1 usec */
	}

	return 1; /* Return value: NOT 0 = complete waiting */
	}

	static void sh_mmcif_clock_control(struct sh_mmcif_host *host, unsigned int clk)
	{
	int i;

	sh_mmcif_bitclr(CLK_ENABLE, &host->regs->ce_clk_ctrl);
	sh_mmcif_bitclr(CLK_CLEAR, &host->regs->ce_clk_ctrl);

	if (!clk)
	return;
	if (clk == CLKDEV_EMMC_DATA) {
	sh_mmcif_bitset(CLK_PCLK, &host->regs->ce_clk_ctrl);
	} else {
	for (i = 1; (unsigned int)host->clk / (1 << i) >= clk; i++)
	;
	sh_mmcif_bitset((i - 1) << 16, &host->regs->ce_clk_ctrl);
	}
	sh_mmcif_bitset(CLK_ENABLE, &host->regs->ce_clk_ctrl);
	}

	static void sh_mmcif_sync_reset(struct sh_mmcif_host *host)
	{
	u32 tmp;

	tmp = sh_mmcif_read(&host->regs->ce_clk_ctrl) & (CLK_ENABLE \|
	CLK_CLEAR);

	sh_mmcif_write(SOFT_RST_ON, &host->regs->ce_version);
	sh_mmcif_write(SOFT_RST_OFF, &host->regs->ce_version);
	sh_mmcif_bitset(tmp \| SRSPTO_256 \| SRBSYTO_29 \| SRWDTO_29 \| SCCSTO_29,
	&host->regs->ce_clk_ctrl);
	/* byte swap on */
	sh_mmcif_bitset(BUF_ACC_ATYP, &host->regs->ce_buf_acc);
	}

	static int sh_mmcif_error_manage(struct sh_mmcif_host *host)
	{
	u32 state1, state2;
	int ret, timeout = 10000000;

	host->sd_error = 0;
	host->wait_int = 0;

	state1 = sh_mmcif_read(&host->regs->ce_host_sts1);
	state2 = sh_mmcif_read(&host->regs->ce_host_sts2);
	debug("%s: ERR HOST_STS1 = %08x\n", \
	DRIVER_NAME, sh_mmcif_read(&host->regs->ce_host_sts1));
	debug("%s: ERR HOST_STS2 = %08x\n", \
	DRIVER_NAME, sh_mmcif_read(&host->regs->ce_host_sts2));

	if (state1 & STS1_CMDSEQ) {
	debug("%s: Forced end of command sequence\n", DRIVER_NAME);
	sh_mmcif_bitset(CMD_CTRL_BREAK, &host->regs->ce_cmd_ctrl);
	sh_mmcif_bitset(~CMD_CTRL_BREAK, &host->regs->ce_cmd_ctrl);
	while (1) {
	timeout--;
	if (timeout < 0) {
	printf(DRIVER_NAME": Forceed end of " \
	"command sequence timeout err\n");
	return -EILSEQ;
	}
	if (!(sh_mmcif_read(&host->regs->ce_host_sts1)
	& STS1_CMDSEQ))
	break;
	}
	sh_mmcif_sync_reset(host);
	return -EILSEQ;
	}

	if (state2 & STS2_CRC_ERR)
	ret = -EILSEQ;
	else if (state2 & STS2_TIMEOUT_ERR)
	ret = TIMEOUT;
	else
	ret = -EILSEQ;
	return ret;
	}

	static int sh_mmcif_single_read(struct sh_mmcif_host *host,
	struct mmc_data *data)
	{
	long time;
	u32 blocksize, i;
	unsigned long p = (unsigned long )data->dest;

	if ((unsigned long)p & 0x00000001) {
	printf("%s: The data pointer is unaligned.", __func__);
	return -EIO;
	}

	host->wait_int = 0;

	/* buf read enable */
	sh_mmcif_bitset(MASK_MBUFREN, &host->regs->ce_int_mask);
	time = mmcif_wait_interrupt_flag(host);
	if (time == 0 \|\| host->sd_error != 0)
	return sh_mmcif_error_manage(host);

	host->wait_int = 0;
	blocksize = (BLOCK_SIZE_MASK &
	sh_mmcif_read(&host->regs->ce_block_set)) + 3;
	for (i = 0; i < blocksize / 4; i++)
	*p++ = sh_mmcif_read(&host->regs->ce_data);

	/* buffer read end */
	sh_mmcif_bitset(MASK_MBUFRE, &host->regs->ce_int_mask);
	time = mmcif_wait_interrupt_flag(host);
	if (time == 0 \|\| host->sd_error != 0)
	return sh_mmcif_error_manage(host);

	host->wait_int = 0;
	return 0;
	}

	static int sh_mmcif_multi_read(struct sh_mmcif_host *host,
	struct mmc_data *data)
	{
	long time;
	u32 blocksize, i, j;
	unsigned long p = (unsigned long )data->dest;

	if ((unsigned long)p & 0x00000001) {
	printf("%s: The data pointer is unaligned.", __func__);
	return -EIO;
	}

	host->wait_int = 0;
	blocksize = BLOCK_SIZE_MASK & sh_mmcif_read(&host->regs->ce_block_set);
	for (j = 0; j < data->blocks; j++) {
	sh_mmcif_bitset(MASK_MBUFREN, &host->regs->ce_int_mask);
	time = mmcif_wait_interrupt_flag(host);
	if (time == 0 \|\| host->sd_error != 0)
	return sh_mmcif_error_manage(host);

	host->wait_int = 0;
	for (i = 0; i < blocksize / 4; i++)
	*p++ = sh_mmcif_read(&host->regs->ce_data);

	WATCHDOG_RESET();
	}
	return 0;
	}

	static int sh_mmcif_single_write(struct sh_mmcif_host *host,
	struct mmc_data *data)
	{
	long time;
	u32 blocksize, i;
	const unsigned long p = (unsigned long )data->dest;

	if ((unsigned long)p & 0x00000001) {
	printf("%s: The data pointer is unaligned.", __func__);
	return -EIO;
	}

	host->wait_int = 0;
	sh_mmcif_bitset(MASK_MBUFWEN, &host->regs->ce_int_mask);

	time = mmcif_wait_interrupt_flag(host);
	if (time == 0 \|\| host->sd_error != 0)
	return sh_mmcif_error_manage(host);

	host->wait_int = 0;
	blocksize = (BLOCK_SIZE_MASK &
	sh_mmcif_read(&host->regs->ce_block_set)) + 3;
	for (i = 0; i < blocksize / 4; i++)
	sh_mmcif_write(*p++, &host->regs->ce_data);

	/* buffer write end */
	sh_mmcif_bitset(MASK_MDTRANE, &host->regs->ce_int_mask);

	time = mmcif_wait_interrupt_flag(host);
	if (time == 0 \|\| host->sd_error != 0)
	return sh_mmcif_error_manage(host);

	host->wait_int = 0;
	return 0;
	}

	static int sh_mmcif_multi_write(struct sh_mmcif_host *host,
	struct mmc_data *data)
	{
	long time;
	u32 i, j, blocksize;
	const unsigned long p = (unsigned long )data->dest;

	if ((unsigned long)p & 0x00000001) {
	printf("%s: The data pointer is unaligned.", __func__);
	return -EIO;
	}

	host->wait_int = 0;
	blocksize = BLOCK_SIZE_MASK & sh_mmcif_read(&host->regs->ce_block_set);
	for (j = 0; j < data->blocks; j++) {
	sh_mmcif_bitset(MASK_MBUFWEN, &host->regs->ce_int_mask);

	time = mmcif_wait_interrupt_flag(host);

	if (time == 0 \|\| host->sd_error != 0)
	return sh_mmcif_error_manage(host);

	host->wait_int = 0;
	for (i = 0; i < blocksize / 4; i++)
	sh_mmcif_write(*p++, &host->regs->ce_data);

	WATCHDOG_RESET();
	}
	return 0;
	}

	static void sh_mmcif_get_response(struct sh_mmcif_host *host,
	struct mmc_cmd *cmd)
	{
	if (cmd->resp_type & MMC_RSP_136) {
	cmd->response[0] = sh_mmcif_read(&host->regs->ce_resp3);
	cmd->response[1] = sh_mmcif_read(&host->regs->ce_resp2);
	cmd->response[2] = sh_mmcif_read(&host->regs->ce_resp1);
	cmd->response[3] = sh_mmcif_read(&host->regs->ce_resp0);
	debug(" RESP %08x, %08x, %08x, %08x\n", cmd->response[0],
	cmd->response[1], cmd->response[2], cmd->response[3]);
	} else {
	cmd->response[0] = sh_mmcif_read(&host->regs->ce_resp0);
	}
	}

	static void sh_mmcif_get_cmd12response(struct sh_mmcif_host *host,
	struct mmc_cmd *cmd)
	{
	cmd->response[0] = sh_mmcif_read(&host->regs->ce_resp_cmd12);
	}

	static u32 sh_mmcif_set_cmd(struct sh_mmcif_host *host,
	struct mmc_data data, struct mmc_cmd cmd)
	{
	u32 tmp = 0;
	u32 opc = cmd->cmdidx;

	/* Response Type check */
	switch (cmd->resp_type) {
	case MMC_RSP_NONE:
	tmp \|= CMD_SET_RTYP_NO;
	break;
	case MMC_RSP_R1:
	case MMC_RSP_R1b:
	case MMC_RSP_R3:
	tmp \|= CMD_SET_RTYP_6B;
	break;
	case MMC_RSP_R2:
	tmp \|= CMD_SET_RTYP_17B;
	break;
	default:
	printf(DRIVER_NAME": Not support type response.\n");
	break;
	}

	/* RBSY */
	if (opc == MMC_CMD_SWITCH)
	tmp \|= CMD_SET_RBSY;

	/* WDAT / DATW */
	if (host->data) {
	tmp \|= CMD_SET_WDAT;
	switch (host->bus_width) {
	case MMC_BUS_WIDTH_1:
	tmp \|= CMD_SET_DATW_1;
	break;
	case MMC_BUS_WIDTH_4:
	tmp \|= CMD_SET_DATW_4;
	break;
	case MMC_BUS_WIDTH_8:
	tmp \|= CMD_SET_DATW_8;
	break;
	default:
	printf(DRIVER_NAME": Not support bus width.\n");
	break;
	}
	}
	/* DWEN */
	if (opc == MMC_CMD_WRITE_SINGLE_BLOCK \|\|
	opc == MMC_CMD_WRITE_MULTIPLE_BLOCK)
	tmp \|= CMD_SET_DWEN;
	/* CMLTE/CMD12EN */
	if (opc == MMC_CMD_READ_MULTIPLE_BLOCK \|\|
	opc == MMC_CMD_WRITE_MULTIPLE_BLOCK) {
	tmp \|= CMD_SET_CMLTE \| CMD_SET_CMD12EN;
	sh_mmcif_bitset(data->blocks << 16, &host->regs->ce_block_set);
	}
	/* RIDXC[1:0] check bits */
	if (opc == MMC_CMD_SEND_OP_COND \|\| opc == MMC_CMD_ALL_SEND_CID \|\|
	opc == MMC_CMD_SEND_CSD \|\| opc == MMC_CMD_SEND_CID)
	tmp \|= CMD_SET_RIDXC_BITS;
	/* RCRC7C[1:0] check bits */
	if (opc == MMC_CMD_SEND_OP_COND)
	tmp \|= CMD_SET_CRC7C_BITS;
	/* RCRC7C[1:0] internal CRC7 */
	if (opc == MMC_CMD_ALL_SEND_CID \|\|
	opc == MMC_CMD_SEND_CSD \|\| opc == MMC_CMD_SEND_CID)
	tmp \|= CMD_SET_CRC7C_INTERNAL;

	return opc = ((opc << 24) \| tmp);
	}

	static u32 sh_mmcif_data_trans(struct sh_mmcif_host *host,
	struct mmc_data *data, u16 opc)
	{
	u32 ret;

	switch (opc) {
	case MMC_CMD_READ_MULTIPLE_BLOCK:
	ret = sh_mmcif_multi_read(host, data);
	break;
	case MMC_CMD_WRITE_MULTIPLE_BLOCK:
	ret = sh_mmcif_multi_write(host, data);
	break;
	case MMC_CMD_WRITE_SINGLE_BLOCK:
	ret = sh_mmcif_single_write(host, data);
	break;
	case MMC_CMD_READ_SINGLE_BLOCK:
	case MMC_CMD_SEND_EXT_CSD:
	ret = sh_mmcif_single_read(host, data);
	break;
	default:
	printf(DRIVER_NAME": NOT SUPPORT CMD = d'%08d\n", opc);
	ret = -EINVAL;
	break;
	}
	return ret;
	}

	static int sh_mmcif_start_cmd(struct sh_mmcif_host *host,
	struct mmc_data data, struct mmc_cmd cmd)
	{
	long time;
	int ret = 0, mask = 0;
	u32 opc = cmd->cmdidx;

	if (opc == MMC_CMD_STOP_TRANSMISSION) {
	/* MMCIF sends the STOP command automatically */
	if (host->last_cmd == MMC_CMD_READ_MULTIPLE_BLOCK)
	sh_mmcif_bitset(MASK_MCMD12DRE,
	&host->regs->ce_int_mask);
	else
	sh_mmcif_bitset(MASK_MCMD12RBE,
	&host->regs->ce_int_mask);

	time = mmcif_wait_interrupt_flag(host);
	if (time == 0 \|\| host->sd_error != 0)
	return sh_mmcif_error_manage(host);

	sh_mmcif_get_cmd12response(host, cmd);
	return 0;
	}
	if (opc == MMC_CMD_SWITCH)
	mask = MASK_MRBSYE;
	else
	mask = MASK_MCRSPE;

	mask \|= MASK_MCMDVIO \| MASK_MBUFVIO \| MASK_MWDATERR \|
	MASK_MRDATERR \| MASK_MRIDXERR \| MASK_MRSPERR \|
	MASK_MCCSTO \| MASK_MCRCSTO \| MASK_MWDATTO \|
	MASK_MRDATTO \| MASK_MRBSYTO \| MASK_MRSPTO;

	if (host->data) {
	sh_mmcif_write(0, &host->regs->ce_block_set);
	sh_mmcif_write(data->blocksize, &host->regs->ce_block_set);
	}
	opc = sh_mmcif_set_cmd(host, data, cmd);

	sh_mmcif_write(INT_START_MAGIC, &host->regs->ce_int);
	sh_mmcif_write(mask, &host->regs->ce_int_mask);

	debug("CMD%d ARG:%08x\n", cmd->cmdidx, cmd->cmdarg);
	/* set arg */
	sh_mmcif_write(cmd->cmdarg, &host->regs->ce_arg);
	host->wait_int = 0;
	/* set cmd */
	sh_mmcif_write(opc, &host->regs->ce_cmd_set);

	time = mmcif_wait_interrupt_flag(host);
	if (time == 0)
	return sh_mmcif_error_manage(host);

	if (host->sd_error) {
	switch (cmd->cmdidx) {
	case MMC_CMD_ALL_SEND_CID:
	case MMC_CMD_SELECT_CARD:
	case MMC_CMD_APP_CMD:
	ret = TIMEOUT;
	break;
	default:
	printf(DRIVER_NAME": Cmd(d'%d) err\n", cmd->cmdidx);
	ret = sh_mmcif_error_manage(host);
	break;
	}
	host->sd_error = 0;
	host->wait_int = 0;
	return ret;
	}

	/* if no response */
	if (!(opc & 0x00C00000))
	return 0;

	if (host->wait_int == 1) {
	sh_mmcif_get_response(host, cmd);
	host->wait_int = 0;
	}
	if (host->data)
	ret = sh_mmcif_data_trans(host, data, cmd->cmdidx);
	host->last_cmd = cmd->cmdidx;

	return ret;
	}

	static int sh_mmcif_request(struct mmc mmc, struct mmc_cmd cmd,
	struct mmc_data *data)
	{
	struct sh_mmcif_host *host = mmc_priv(mmc);
	int ret;

	WATCHDOG_RESET();

	switch (cmd->cmdidx) {
	case MMC_CMD_APP_CMD:
	return TIMEOUT;
	case MMC_CMD_SEND_EXT_CSD: /* = SD_SEND_IF_COND (8) */
	if (data)
	/* ext_csd */
	break;
	else
	/* send_if_cond cmd (not support) */
	return TIMEOUT;
	default:
	break;
	}
	host->sd_error = 0;
	host->data = data;
	ret = sh_mmcif_start_cmd(host, data, cmd);
	host->data = NULL;

	return ret;
	}

	static void sh_mmcif_set_ios(struct mmc *mmc)
	{
	struct sh_mmcif_host *host = mmc_priv(mmc);

	if (mmc->clock)
	sh_mmcif_clock_control(host, mmc->clock);

	if (mmc->bus_width == 8)
	host->bus_width = MMC_BUS_WIDTH_8;
	else if (mmc->bus_width == 4)
	host->bus_width = MMC_BUS_WIDTH_4;
	else
	host->bus_width = MMC_BUS_WIDTH_1;

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

	static int sh_mmcif_init(struct mmc *mmc)
	{
	struct sh_mmcif_host *host = mmc_priv(mmc);

	sh_mmcif_sync_reset(host);
	sh_mmcif_write(MASK_ALL, &host->regs->ce_int_mask);
	return 0;
	}

	int mmcif_mmc_init(void)
	{
	int ret = 0;
	struct mmc *mmc;
	struct sh_mmcif_host *host = NULL;

	mmc = malloc(sizeof(struct mmc));
	if (!mmc)
	ret = -ENOMEM;
	memset(mmc, 0, sizeof(*mmc));
	host = malloc(sizeof(struct sh_mmcif_host));
	if (!host)
	ret = -ENOMEM;
	memset(host, 0, sizeof(*host));

	mmc->f_min = CLKDEV_MMC_INIT;
	mmc->f_max = CLKDEV_EMMC_DATA;
	mmc->voltages = MMC_VDD_32_33 \| MMC_VDD_33_34;
	mmc->host_caps = MMC_MODE_HS \| MMC_MODE_HS_52MHz \| MMC_MODE_4BIT \|
	MMC_MODE_8BIT \| MMC_MODE_HC;
	memcpy(mmc->name, DRIVER_NAME, sizeof(DRIVER_NAME));
	mmc->send_cmd = sh_mmcif_request;
	mmc->set_ios = sh_mmcif_set_ios;
	mmc->init = sh_mmcif_init;
	mmc->getcd = NULL;
	host->regs = (struct sh_mmcif_regs *)CONFIG_SH_MMCIF_ADDR;
	host->clk = CONFIG_SH_MMCIF_CLK;
	mmc->priv = host;

	mmc_register(mmc);

	return ret;
	}