mmc: dw-mmc: support DesignWare MMC Controller

Support the DesginWare MMC Controller.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Rajeshawari Shinde <rajeshwari.s@samsung.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

3 files changed, 577 insertions, 0 deletions

diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index ac3cb0b..a1dd730 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -46,6 +46,7 @@ COBJS-$(CONFIG_SDHCI) += sdhci.o
 COBJS-$(CONFIG_S5P_SDHCI) += s5p_sdhci.o
 COBJS-$(CONFIG_SH_MMCIF) += sh_mmcif.o
 COBJS-$(CONFIG_TEGRA_MMC) += tegra_mmc.o
+COBJS-$(CONFIG_DWMMC) += dw_mmc.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
new file mode 100644
index 0000000..4070d4e
--- /dev/null
+++ b/drivers/mmc/dw_mmc.c
@@ -0,0 +1,385 @@
+/*
+ * (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;
+}
diff --git a/include/dwmmc.h b/include/dwmmc.h
new file mode 100644
index 0000000..c8b1d40
--- /dev/null
+++ b/include/dwmmc.h
@@ -0,0 +1,191 @@
+/*
+ * (C) Copyright 2012 SAMSUNG Electronics
+ * Jaehoon Chung <jh80.chung@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
+ *
+ */
+
+#ifndef __DWMMC_HW_H
+#define __DWMMC_HW_H
+
+#include <asm/io.h>
+#include <mmc.h>
+
+#define DWMCI_CTRL		0x000
+#define	DWMCI_PWREN		0x004
+#define DWMCI_CLKDIV		0x008
+#define DWMCI_CLKSRC		0x00C
+#define DWMCI_CLKENA		0x010
+#define DWMCI_TMOUT		0x014
+#define DWMCI_CTYPE		0x018
+#define DWMCI_BLKSIZ		0x01C
+#define DWMCI_BYTCNT		0x020
+#define DWMCI_INTMASK		0x024
+#define DWMCI_CMDARG		0x028
+#define DWMCI_CMD		0x02C
+#define DWMCI_RESP0		0x030
+#define DWMCI_RESP1		0x034
+#define DWMCI_RESP2		0x038
+#define DWMCI_RESP3		0x03C
+#define DWMCI_MINTSTS		0x040
+#define DWMCI_RINTSTS		0x044
+#define DWMCI_STATUS		0x048
+#define DWMCI_FIFOTH		0x04C
+#define DWMCI_CDETECT		0x050
+#define DWMCI_WRTPRT		0x054
+#define DWMCI_GPIO		0x058
+#define DWMCI_TCMCNT		0x05C
+#define DWMCI_TBBCNT		0x060
+#define DWMCI_DEBNCE		0x064
+#define DWMCI_USRID		0x068
+#define DWMCI_VERID		0x06C
+#define DWMCI_HCON		0x070
+#define DWMCI_UHS_REG		0x074
+#define DWMCI_BMOD		0x080
+#define DWMCI_PLDMND		0x084
+#define DWMCI_DBADDR		0x088
+#define DWMCI_IDSTS		0x08C
+#define DWMCI_IDINTEN		0x090
+#define DWMCI_DSCADDR		0x094
+#define DWMCI_BUFADDR		0x098
+#define DWMCI_DATA		0x200
+
+/* Interrupt Mask register */
+#define DWMCI_INTMSK_ALL	0xffffffff
+#define DWMCI_INTMSK_RE		(1 << 1)
+#define DWMCI_INTMSK_CDONE	(1 << 2)
+#define DWMCI_INTMSK_DTO	(1 << 3)
+#define DWMCI_INTMSK_TXDR	(1 << 4)
+#define DWMCI_INTMSK_RXDR	(1 << 5)
+#define DWMCI_INTMSK_DCRC	(1 << 7)
+#define DWMCI_INTMSK_RTO	(1 << 8)
+#define DWMCI_INTMSK_DRTO	(1 << 9)
+#define DWMCI_INTMSK_HTO	(1 << 10)
+#define DWMCI_INTMSK_FRUN	(1 << 11)
+#define DWMCI_INTMSK_HLE	(1 << 12)
+#define DWMCI_INTMSK_SBE	(1 << 13)
+#define DWMCI_INTMSK_ACD	(1 << 14)
+#define DWMCI_INTMSK_EBE	(1 << 15)
+
+/* Raw interrupt Regsiter */
+#define DWMCI_DATA_ERR	(DWMCI_INTMSK_EBE | DWMCI_INTMSK_SBE | DWMCI_INTMSK_HLE |\
+			DWMCI_INTMSK_FRUN | DWMCI_INTMSK_EBE | DWMCI_INTMSK_DCRC)
+#define DWMCI_DATA_TOUT	(DWMCI_INTMSK_HTO | DWMCI_INTMSK_DRTO)
+/* CTRL register */
+#define DWMCI_CTRL_RESET	(1 << 0)
+#define DWMCI_CTRL_FIFO_RESET	(1 << 1)
+#define DWMCI_CTRL_DMA_RESET	(1 << 2)
+#define DWMCI_DMA_EN		(1 << 5)
+#define DWMCI_CTRL_SEND_AS_CCSD	(1 << 10)
+#define DWMCI_IDMAC_EN		(1 << 25)
+#define DWMCI_RESET_ALL		(DWMCI_CTRL_RESET | DWMCI_CTRL_FIFO_RESET |\
+				DWMCI_CTRL_DMA_RESET)
+
+/* CMD register */
+#define DWMCI_CMD_RESP_EXP	(1 << 6)
+#define DWMCI_CMD_RESP_LENGTH	(1 << 7)
+#define DWMCI_CMD_CHECK_CRC	(1 << 8)
+#define DWMCI_CMD_DATA_EXP	(1 << 9)
+#define DWMCI_CMD_RW		(1 << 10)
+#define DWMCI_CMD_SEND_STOP	(1 << 12)
+#define DWMCI_CMD_ABORT_STOP	(1 << 14)
+#define DWMCI_CMD_PRV_DAT_WAIT	(1 << 13)
+#define DWMCI_CMD_UPD_CLK	(1 << 21)
+#define DWMCI_CMD_USE_HOLD_REG	(1 << 29)
+#define DWMCI_CMD_START		(1 << 31)
+
+/* CLKENA register */
+#define DWMCI_CLKEN_ENABLE	(1 << 0)
+#define DWMCI_CLKEN_LOW_PWR	(1 << 16)
+
+/* Card-type registe */
+#define DWMCI_CTYPE_1BIT	0
+#define DWMCI_CTYPE_4BIT	(1 << 0)
+#define DWMCI_CTYPE_8BIT	(1 << 16)
+
+/* Status Register */
+#define DWMCI_BUSY		(1 << 9)
+
+/* FIFOTH Register */
+#define MSIZE(x)		((x) << 28)
+#define RX_WMARK(x)		((x) << 16)
+#define TX_WMARK(x)		(x)
+
+#define DWMCI_IDMAC_OWN		(1 << 31)
+#define DWMCI_IDMAC_CH		(1 << 4)
+#define DWMCI_IDMAC_FS		(1 << 3)
+#define DWMCI_IDMAC_LD		(1 << 2)
+
+/*  Bus Mode Register */
+#define DWMCI_BMOD_IDMAC_RESET	(1 << 0)
+#define DWMCI_BMOD_IDMAC_FB	(1 << 1)
+#define DWMCI_BMOD_IDMAC_EN	(1 << 7)
+
+struct dwmci_host {
+	char *name;
+	void *ioaddr;
+	unsigned int quirks;
+	unsigned int caps;
+	unsigned int version;
+	unsigned int clock;
+	unsigned int bus_hz;
+	int dev_index;
+	int buswidth;
+	u32 fifoth_val;
+	struct mmc *mmc;
+
+	void (*clksel)(struct dwmci_host *host);
+	unsigned int (*mmc_clk)(int dev_index);
+};
+
+struct dwmci_idmac {
+	u32 flags;
+	u32 cnt;
+	u32 addr;
+	u32 next_addr;
+};
+
+static inline void dwmci_writel(struct dwmci_host *host, int reg, u32 val)
+{
+	writel(val, host->ioaddr + reg);
+}
+
+static inline void dwmci_writew(struct dwmci_host *host, int reg, u16 val)
+{
+	writew(val, host->ioaddr + reg);
+}
+
+static inline void dwmci_writeb(struct dwmci_host *host, int reg, u8 val)
+{
+	writeb(val, host->ioaddr + reg);
+}
+static inline u32 dwmci_readl(struct dwmci_host *host, int reg)
+{
+	return readl(host->ioaddr + reg);
+}
+
+static inline u16 dwmci_readw(struct dwmci_host *host, int reg)
+{
+	return readw(host->ioaddr + reg);
+}
+
+static inline u8 dwmci_readb(struct dwmci_host *host, int reg)
+{
+	return readb(host->ioaddr + reg);
+}
+
+int add_dwmci(struct dwmci_host *host, u32 max_clk, u32 min_clk);
+#endif	/* __DWMMC_HW_H */