Patchwork [U-Boot,1/2] mmc: sh_mmcif: add support for Renesas MMCIF

login
register
mail settings
Submitter Yoshihiro Shimoda
Date July 5, 2011, 8:21 a.m.
Message ID <4E12C982.6070900@renesas.com>
Download mbox | patch
Permalink /patch/103214/
State Accepted, archived
Delegated to: Andy Fleming
Headers show

Comments

Yoshihiro Shimoda - July 5, 2011, 8:21 a.m.
Some Renesas SuperH have MMCIF module. This driver supports it.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 README                 |    9 +
 drivers/mmc/Makefile   |    1 +
 drivers/mmc/sh_mmcif.c |  608 ++++++++++++++++++++++++++++++++++++++++++++++++
 drivers/mmc/sh_mmcif.h |  238 +++++++++++++++++++
 4 files changed, 856 insertions(+), 0 deletions(-)
 create mode 100644 drivers/mmc/sh_mmcif.c
 create mode 100644 drivers/mmc/sh_mmcif.h

Patch

diff --git a/README b/README
index 2da0f96..15eb6a2 100644
--- a/README
+++ b/README
@@ -1054,6 +1054,15 @@  The following options need to be configured:
 		enabled with CONFIG_CMD_MMC. The MMC driver also works with
 		the FAT fs. This is enabled with CONFIG_CMD_FAT.

+		CONFIG_SH_MMCIF
+		Support for Renesas on-chip MMCIF controller
+
+			CONFIG_SH_MMCIF_ADDR
+			Define the base address of MMCIF registers
+
+			CONFIG_SH_MMCIF_CLK
+			Define the clock frequency for MMCIF
+
 - Journaling Flash filesystem support:
 		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
 		CONFIG_JFFS2_NAND_DEV
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index a8fe17a..2218961 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -38,6 +38,7 @@  COBJS-$(CONFIG_OMAP3_MMC) += omap3_mmc.o
 COBJS-$(CONFIG_OMAP_HSMMC) += omap_hsmmc.o
 COBJS-$(CONFIG_PXA_MMC) += pxa_mmc.o
 COBJS-$(CONFIG_S5P_MMC) += s5p_mmc.o
+COBJS-$(CONFIG_SH_MMCIF) += sh_mmcif.o

 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
diff --git a/drivers/mmc/sh_mmcif.c b/drivers/mmc/sh_mmcif.c
new file mode 100644
index 0000000..567e2cb
--- /dev/null
+++ b/drivers/mmc/sh_mmcif.c
@@ -0,0 +1,608 @@ 
+/*
+ * 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;
+	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;
+	host->regs = (struct sh_mmcif_regs *)CONFIG_SH_MMCIF_ADDR;
+	host->clk = CONFIG_SH_MMCIF_CLK;
+	mmc->priv = host;
+
+	mmc_register(mmc);
+
+	return ret;
+}
diff --git a/drivers/mmc/sh_mmcif.h b/drivers/mmc/sh_mmcif.h
new file mode 100644
index 0000000..bd6fbf7
--- /dev/null
+++ b/drivers/mmc/sh_mmcif.h
@@ -0,0 +1,238 @@ 
+/*
+ * 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.
+ *
+ */
+
+#ifndef _SH_MMCIF_H_
+#define _SH_MMCIF_H_
+
+struct sh_mmcif_regs {
+	unsigned long ce_cmd_set;
+	unsigned long reserved;
+	unsigned long ce_arg;
+	unsigned long ce_arg_cmd12;
+	unsigned long ce_cmd_ctrl;
+	unsigned long ce_block_set;
+	unsigned long ce_clk_ctrl;
+	unsigned long ce_buf_acc;
+	unsigned long ce_resp3;
+	unsigned long ce_resp2;
+	unsigned long ce_resp1;
+	unsigned long ce_resp0;
+	unsigned long ce_resp_cmd12;
+	unsigned long ce_data;
+	unsigned long reserved2[2];
+	unsigned long ce_int;
+	unsigned long ce_int_mask;
+	unsigned long ce_host_sts1;
+	unsigned long ce_host_sts2;
+	unsigned long reserved3[11];
+	unsigned long ce_version;
+};
+
+/* CE_CMD_SET */
+#define CMD_MASK		0x3f000000
+#define CMD_SET_RTYP_NO		((0 << 23) | (0 << 22))
+/* R1/R1b/R3/R4/R5 */
+#define CMD_SET_RTYP_6B		((0 << 23) | (1 << 22))
+/* R2 */
+#define CMD_SET_RTYP_17B	((1 << 23) | (0 << 22))
+/* R1b */
+#define CMD_SET_RBSY		(1 << 21)
+#define CMD_SET_CCSEN		(1 << 20)
+/* 1: on data, 0: no data */
+#define CMD_SET_WDAT		(1 << 19)
+/* 1: write to card, 0: read from card */
+#define CMD_SET_DWEN		(1 << 18)
+/* 1: multi block trans, 0: single */
+#define CMD_SET_CMLTE		(1 << 17)
+/* 1: CMD12 auto issue */
+#define CMD_SET_CMD12EN		(1 << 16)
+/* index check */
+#define CMD_SET_RIDXC_INDEX	((0 << 15) | (0 << 14))
+/* check bits check */
+#define CMD_SET_RIDXC_BITS	((0 << 15) | (1 << 14))
+/* no check */
+#define CMD_SET_RIDXC_NO	((1 << 15) | (0 << 14))
+/* 1: CRC7 check*/
+#define CMD_SET_CRC7C		((0 << 13) | (0 << 12))
+/* 1: check bits check*/
+#define CMD_SET_CRC7C_BITS	((0 << 13) | (1 << 12))
+/* 1: internal CRC7 check*/
+#define CMD_SET_CRC7C_INTERNAL	((1 << 13) | (0 << 12))
+/* 1: CRC16 check*/
+#define CMD_SET_CRC16C		(1 << 10)
+/* 1: not receive CRC status */
+#define CMD_SET_CRCSTE		(1 << 8)
+/* 1: tran mission bit "Low" */
+#define CMD_SET_TBIT		(1 << 7)
+/* 1: open/drain */
+#define CMD_SET_OPDM		(1 << 6)
+#define CMD_SET_CCSH		(1 << 5)
+/* 1bit */
+#define CMD_SET_DATW_1		((0 << 1) | (0 << 0))
+/* 4bit */
+#define CMD_SET_DATW_4		((0 << 1) | (1 << 0))
+/* 8bit */
+#define CMD_SET_DATW_8		((1 << 1) | (0 << 0))
+
+/* CE_CMD_CTRL */
+#define CMD_CTRL_BREAK		(1 << 0)
+
+/* CE_BLOCK_SET */
+#define BLOCK_SIZE_MASK		0x0000ffff
+
+/* CE_CLK_CTRL */
+#define CLK_ENABLE		(1 << 24)
+#define CLK_CLEAR		((1 << 19) | (1 << 18) | (1 << 17) | (1 << 16))
+#define CLK_PCLK		((1 << 19) | (1 << 18) | (1 << 17) | (1 << 16))
+/* respons timeout */
+#define SRSPTO_256		((1 << 13) | (0 << 12))
+/* respons busy timeout */
+#define SRBSYTO_29		((1 << 11) | (1 << 10) | (1 << 9) | (1 << 8))
+/* read/write timeout */
+#define SRWDTO_29		((1 << 7) | (1 << 6) | (1 << 5) | (1 << 4))
+/* ccs timeout */
+#define SCCSTO_29		((1 << 3) | (1 << 2) | (1 << 1) | (1 << 0))
+
+/* CE_BUF_ACC */
+#define BUF_ACC_DMAWEN		(1 << 25)
+#define BUF_ACC_DMAREN		(1 << 24)
+#define BUF_ACC_BUSW_32		(0 << 17)
+#define BUF_ACC_BUSW_16		(1 << 17)
+#define BUF_ACC_ATYP		(1 << 16)
+
+/* CE_INT */
+#define INT_CCSDE		(1 << 29)
+#define INT_CMD12DRE		(1 << 26)
+#define INT_CMD12RBE		(1 << 25)
+#define INT_CMD12CRE		(1 << 24)
+#define INT_DTRANE		(1 << 23)
+#define INT_BUFRE		(1 << 22)
+#define INT_BUFWEN		(1 << 21)
+#define INT_BUFREN		(1 << 20)
+#define INT_CCSRCV		(1 << 19)
+#define INT_RBSYE		(1 << 17)
+#define INT_CRSPE		(1 << 16)
+#define INT_CMDVIO		(1 << 15)
+#define INT_BUFVIO		(1 << 14)
+#define INT_WDATERR		(1 << 11)
+#define INT_RDATERR		(1 << 10)
+#define INT_RIDXERR		(1 << 9)
+#define INT_RSPERR		(1 << 8)
+#define INT_CCSTO		(1 << 5)
+#define INT_CRCSTO		(1 << 4)
+#define INT_WDATTO		(1 << 3)
+#define INT_RDATTO		(1 << 2)
+#define INT_RBSYTO		(1 << 1)
+#define INT_RSPTO		(1 << 0)
+#define INT_ERR_STS		(INT_CMDVIO | INT_BUFVIO | INT_WDATERR |  \
+				 INT_RDATERR | INT_RIDXERR | INT_RSPERR | \
+				 INT_CCSTO | INT_CRCSTO | INT_WDATTO |	  \
+				 INT_RDATTO | INT_RBSYTO | INT_RSPTO)
+#define INT_START_MAGIC		0xD80430C0
+
+/* CE_INT_MASK */
+#define MASK_ALL		0x00000000
+#define MASK_MCCSDE		(1 << 29)
+#define MASK_MCMD12DRE		(1 << 26)
+#define MASK_MCMD12RBE		(1 << 25)
+#define MASK_MCMD12CRE		(1 << 24)
+#define MASK_MDTRANE		(1 << 23)
+#define MASK_MBUFRE		(1 << 22)
+#define MASK_MBUFWEN		(1 << 21)
+#define MASK_MBUFREN		(1 << 20)
+#define MASK_MCCSRCV		(1 << 19)
+#define MASK_MRBSYE		(1 << 17)
+#define MASK_MCRSPE		(1 << 16)
+#define MASK_MCMDVIO		(1 << 15)
+#define MASK_MBUFVIO		(1 << 14)
+#define MASK_MWDATERR		(1 << 11)
+#define MASK_MRDATERR		(1 << 10)
+#define MASK_MRIDXERR		(1 << 9)
+#define MASK_MRSPERR		(1 << 8)
+#define MASK_MCCSTO		(1 << 5)
+#define MASK_MCRCSTO		(1 << 4)
+#define MASK_MWDATTO		(1 << 3)
+#define MASK_MRDATTO		(1 << 2)
+#define MASK_MRBSYTO		(1 << 1)
+#define MASK_MRSPTO		(1 << 0)
+
+/* CE_HOST_STS1 */
+#define STS1_CMDSEQ		(1 << 31)
+
+/* CE_HOST_STS2 */
+#define STS2_CRCSTE		(1 << 31)
+#define STS2_CRC16E		(1 << 30)
+#define STS2_AC12CRCE		(1 << 29)
+#define STS2_RSPCRC7E		(1 << 28)
+#define STS2_CRCSTEBE		(1 << 27)
+#define STS2_RDATEBE		(1 << 26)
+#define STS2_AC12REBE		(1 << 25)
+#define STS2_RSPEBE		(1 << 24)
+#define STS2_AC12IDXE		(1 << 23)
+#define STS2_RSPIDXE		(1 << 22)
+#define STS2_CCSTO		(1 << 15)
+#define STS2_RDATTO		(1 << 14)
+#define STS2_DATBSYTO		(1 << 13)
+#define STS2_CRCSTTO		(1 << 12)
+#define STS2_AC12BSYTO		(1 << 11)
+#define STS2_RSPBSYTO		(1 << 10)
+#define STS2_AC12RSPTO		(1 << 9)
+#define STS2_RSPTO		(1 << 8)
+
+#define STS2_CRC_ERR		(STS2_CRCSTE | STS2_CRC16E |		\
+				 STS2_AC12CRCE | STS2_RSPCRC7E | STS2_CRCSTEBE)
+#define STS2_TIMEOUT_ERR	(STS2_CCSTO | STS2_RDATTO |		\
+				 STS2_DATBSYTO | STS2_CRCSTTO |		\
+				 STS2_AC12BSYTO | STS2_RSPBSYTO |	\
+				 STS2_AC12RSPTO | STS2_RSPTO)
+
+/* CE_VERSION */
+#define SOFT_RST_ON		(1 << 31)
+#define SOFT_RST_OFF		(0 << 31)
+
+#define CLKDEV_EMMC_DATA	52000000	/* 52MHz */
+#define	CLKDEV_MMC_INIT		400000		/* 100 - 400 KHz */
+
+#define MMC_BUS_WIDTH_1		0
+#define MMC_BUS_WIDTH_4		2
+#define MMC_BUS_WIDTH_8		3
+
+struct sh_mmcif_host {
+	struct mmc_data		*data;
+	struct sh_mmcif_regs	*regs;
+	unsigned int		clk;
+	int			bus_width;
+	u16			wait_int;
+	u16			sd_error;
+	u8			last_cmd;
+};
+
+static inline u32 sh_mmcif_read(unsigned long *reg)
+{
+	return readl(reg);
+}
+
+static inline void sh_mmcif_write(u32 val, unsigned long *reg)
+{
+	writel(val, reg);
+}
+
+static inline void sh_mmcif_bitset(u32 val, unsigned long *reg)
+{
+	sh_mmcif_write(val | sh_mmcif_read(reg), reg);
+}
+
+static inline void sh_mmcif_bitclr(u32 val, unsigned long *reg)
+{
+	sh_mmcif_write(~val & sh_mmcif_read(reg), reg);
+}
+
+#endif /* _SH_MMCIF_H_ */