mmc: dw-mmc: support DesignWare MMC controller

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+/*
+ * (C) Copyright 2012 SAMSUNG Electronics
+ * Jaehoon Chung <[email protected]>
+ * Rajeshawari Shinde <[email protected]>
+ *
+ * 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;
+		if (timeout == 0)
+			break;
+	}
+	return 0;
+}
+
+static void dwmci_set_idma_desc(u8 *idmac, unsigned int des0,
+		unsigned int des1, unsigned int des2)
+{
+	struct dwmci_idmac *desc = (struct dwmci_idmac *)idmac;
+
+	desc->des0 = des0;
+	desc->des1 = des1;
+	desc->des2 = des2;
+	desc->des3 = (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, flag, cnt, blk_cnt;
+	struct dwmci_idmac *p;
+	ulong data_start, data_end, start_addr;
+	ALLOC_CACHE_ALIGN_BUFFER(struct dwmci_idmac, idmac, 65565);
+
+
+	p = idmac;
+	blk_cnt = data->blocks;
+
+	dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);
+
+	if (data->flags == MMC_DATA_READ)
+		start_addr = (unsigned int)data->dest;
+	else
+		start_addr = (unsigned int)data->src;
+
+	do {
+		flag = DWMCI_IDMAC_OWN | DWMCI_IDMAC_CH ;
+		flag |= (i == 0) ? DWMCI_IDMAC_FS : 0;
+		if (blk_cnt <= 8) {
+			flag |= DWMCI_IDMAC_LD;
+			cnt = data->blocksize * blk_cnt;
+		} else {
+			flag &= ~DWMCI_IDMAC_LD;
+			cnt = data->blocksize * 8;
+		}
+
+		dwmci_set_idma_desc((u8 *)p, flag, cnt,
+				start_addr + (i * PAGE_SIZE));
+
+		if (blk_cnt <= 8)
+			break;
+		blk_cnt -= 8;
+		p++;
+		i++;
+	} while(1);
+
+	data_start = (ulong)idmac;
+	data_end = (ulong)p;
+	flush_dcache_range(data_start, data_end + ARCH_DMA_MINALIGN);
+
+	dwmci_writel(host, DWMCI_DBADDR, (unsigned int)(idmac));
+
+	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) {
+		while (1) {
+			mask = dwmci_readl(host, DWMCI_RINTSTS);
+			if (mask & (DWMCI_DATA_ERR | DWMCI_DATA_TOUT)) {
+				debug("DATA ERROR!\n");
+				return -1;
+			} else if (mask & DWMCI_INTMSK_DTO)
+				break;
+		}
+
+		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 get_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->get_mmc_clk)
+		sclk = host->get_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;
+	}
+
+	for (div = 1; div < 255; div++) {
+		if ((sclk / (2 * div)) <= freq) {
+			break;
+		}
+	}
+
+	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) && timeout--);
+
+	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) && timeout--);
+
+	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 = (0x2 << 28) | ((fifo_size/2 -1) << 16) |
+			((fifo_size/2) << 0);
+	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, int index)
+{
+	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 = MMC_MODE_HS | MMC_MODE_HS_52MHz | MMC_MODE_8BIT |
+		MMC_MODE_HC;
+
+	err = mmc_register(mmc);
+
+	return err;
+}

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