Initial import

1 files changed, 1091 insertions, 0 deletions

diff --git a/drivers/mmc/host/tifm_sd.c b/drivers/mmc/host/tifm_sd.c
new file mode 100644
index 000000000..93c4b40df
--- /dev/null
+++ b/drivers/mmc/host/tifm_sd.c
@@ -0,0 +1,1091 @@
+/*
+ *  tifm_sd.c - TI FlashMedia driver
+ *
+ *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Special thanks to Brad Campbell for extensive testing of this driver.
+ *
+ */
+
+
+#include <linux/tifm.h>
+#include <linux/mmc/host.h>
+#include <linux/highmem.h>
+#include <linux/scatterlist.h>
+#include <linux/module.h>
+#include <asm/io.h>
+
+#define DRIVER_NAME "tifm_sd"
+#define DRIVER_VERSION "0.8"
+
+static bool no_dma = 0;
+static bool fixed_timeout = 0;
+module_param(no_dma, bool, 0644);
+module_param(fixed_timeout, bool, 0644);
+
+/* Constants here are mostly from OMAP5912 datasheet */
+#define TIFM_MMCSD_RESET      0x0002
+#define TIFM_MMCSD_CLKMASK    0x03ff
+#define TIFM_MMCSD_POWER      0x0800
+#define TIFM_MMCSD_4BBUS      0x8000
+#define TIFM_MMCSD_RXDE       0x8000   /* rx dma enable */
+#define TIFM_MMCSD_TXDE       0x0080   /* tx dma enable */
+#define TIFM_MMCSD_BUFINT     0x0c00   /* set bits: AE, AF */
+#define TIFM_MMCSD_DPE        0x0020   /* data timeout counted in kilocycles */
+#define TIFM_MMCSD_INAB       0x0080   /* abort / initialize command */
+#define TIFM_MMCSD_READ       0x8000
+
+#define TIFM_MMCSD_ERRMASK    0x01e0   /* set bits: CCRC, CTO, DCRC, DTO */
+#define TIFM_MMCSD_EOC        0x0001   /* end of command phase  */
+#define TIFM_MMCSD_CD         0x0002   /* card detect           */
+#define TIFM_MMCSD_CB         0x0004   /* card enter busy state */
+#define TIFM_MMCSD_BRS        0x0008   /* block received/sent   */
+#define TIFM_MMCSD_EOFB       0x0010   /* card exit busy state  */
+#define TIFM_MMCSD_DTO        0x0020   /* data time-out         */
+#define TIFM_MMCSD_DCRC       0x0040   /* data crc error        */
+#define TIFM_MMCSD_CTO        0x0080   /* command time-out      */
+#define TIFM_MMCSD_CCRC       0x0100   /* command crc error     */
+#define TIFM_MMCSD_AF         0x0400   /* fifo almost full      */
+#define TIFM_MMCSD_AE         0x0800   /* fifo almost empty     */
+#define TIFM_MMCSD_OCRB       0x1000   /* OCR busy              */
+#define TIFM_MMCSD_CIRQ       0x2000   /* card irq (cmd40/sdio) */
+#define TIFM_MMCSD_CERR       0x4000   /* card status error     */
+
+#define TIFM_MMCSD_ODTO       0x0040   /* open drain / extended timeout */
+#define TIFM_MMCSD_CARD_RO    0x0200   /* card is read-only     */
+
+#define TIFM_MMCSD_FIFO_SIZE  0x0020
+
+#define TIFM_MMCSD_RSP_R0     0x0000
+#define TIFM_MMCSD_RSP_R1     0x0100
+#define TIFM_MMCSD_RSP_R2     0x0200
+#define TIFM_MMCSD_RSP_R3     0x0300
+#define TIFM_MMCSD_RSP_R4     0x0400
+#define TIFM_MMCSD_RSP_R5     0x0500
+#define TIFM_MMCSD_RSP_R6     0x0600
+
+#define TIFM_MMCSD_RSP_BUSY   0x0800
+
+#define TIFM_MMCSD_CMD_BC     0x0000
+#define TIFM_MMCSD_CMD_BCR    0x1000
+#define TIFM_MMCSD_CMD_AC     0x2000
+#define TIFM_MMCSD_CMD_ADTC   0x3000
+
+#define TIFM_MMCSD_MAX_BLOCK_SIZE  0x0800UL
+
+enum {
+	CMD_READY    = 0x0001,
+	FIFO_READY   = 0x0002,
+	BRS_READY    = 0x0004,
+	SCMD_ACTIVE  = 0x0008,
+	SCMD_READY   = 0x0010,
+	CARD_BUSY    = 0x0020,
+	DATA_CARRY   = 0x0040
+};
+
+struct tifm_sd {
+	struct tifm_dev       *dev;
+
+	unsigned short        eject:1,
+			      open_drain:1,
+			      no_dma:1;
+	unsigned short        cmd_flags;
+
+	unsigned int          clk_freq;
+	unsigned int          clk_div;
+	unsigned long         timeout_jiffies;
+
+	struct tasklet_struct finish_tasklet;
+	struct timer_list     timer;
+	struct mmc_request    *req;
+
+	int                   sg_len;
+	int                   sg_pos;
+	unsigned int          block_pos;
+	struct scatterlist    bounce_buf;
+	unsigned char         bounce_buf_data[TIFM_MMCSD_MAX_BLOCK_SIZE];
+};
+
+/* for some reason, host won't respond correctly to readw/writew */
+static void tifm_sd_read_fifo(struct tifm_sd *host, struct page *pg,
+			      unsigned int off, unsigned int cnt)
+{
+	struct tifm_dev *sock = host->dev;
+	unsigned char *buf;
+	unsigned int pos = 0, val;
+
+	buf = kmap_atomic(pg) + off;
+	if (host->cmd_flags & DATA_CARRY) {
+		buf[pos++] = host->bounce_buf_data[0];
+		host->cmd_flags &= ~DATA_CARRY;
+	}
+
+	while (pos < cnt) {
+		val = readl(sock->addr + SOCK_MMCSD_DATA);
+		buf[pos++] = val & 0xff;
+		if (pos == cnt) {
+			host->bounce_buf_data[0] = (val >> 8) & 0xff;
+			host->cmd_flags |= DATA_CARRY;
+			break;
+		}
+		buf[pos++] = (val >> 8) & 0xff;
+	}
+	kunmap_atomic(buf - off);
+}
+
+static void tifm_sd_write_fifo(struct tifm_sd *host, struct page *pg,
+			       unsigned int off, unsigned int cnt)
+{
+	struct tifm_dev *sock = host->dev;
+	unsigned char *buf;
+	unsigned int pos = 0, val;
+
+	buf = kmap_atomic(pg) + off;
+	if (host->cmd_flags & DATA_CARRY) {
+		val = host->bounce_buf_data[0] | ((buf[pos++] << 8) & 0xff00);
+		writel(val, sock->addr + SOCK_MMCSD_DATA);
+		host->cmd_flags &= ~DATA_CARRY;
+	}
+
+	while (pos < cnt) {
+		val = buf[pos++];
+		if (pos == cnt) {
+			host->bounce_buf_data[0] = val & 0xff;
+			host->cmd_flags |= DATA_CARRY;
+			break;
+		}
+		val |= (buf[pos++] << 8) & 0xff00;
+		writel(val, sock->addr + SOCK_MMCSD_DATA);
+	}
+	kunmap_atomic(buf - off);
+}
+
+static void tifm_sd_transfer_data(struct tifm_sd *host)
+{
+	struct mmc_data *r_data = host->req->cmd->data;
+	struct scatterlist *sg = r_data->sg;
+	unsigned int off, cnt, t_size = TIFM_MMCSD_FIFO_SIZE * 2;
+	unsigned int p_off, p_cnt;
+	struct page *pg;
+
+	if (host->sg_pos == host->sg_len)
+		return;
+	while (t_size) {
+		cnt = sg[host->sg_pos].length - host->block_pos;
+		if (!cnt) {
+			host->block_pos = 0;
+			host->sg_pos++;
+			if (host->sg_pos == host->sg_len) {
+				if ((r_data->flags & MMC_DATA_WRITE)
+				    && (host->cmd_flags & DATA_CARRY))
+					writel(host->bounce_buf_data[0],
+					       host->dev->addr
+					       + SOCK_MMCSD_DATA);
+
+				return;
+			}
+			cnt = sg[host->sg_pos].length;
+		}
+		off = sg[host->sg_pos].offset + host->block_pos;
+
+		pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
+		p_off = offset_in_page(off);
+		p_cnt = PAGE_SIZE - p_off;
+		p_cnt = min(p_cnt, cnt);
+		p_cnt = min(p_cnt, t_size);
+
+		if (r_data->flags & MMC_DATA_READ)
+			tifm_sd_read_fifo(host, pg, p_off, p_cnt);
+		else if (r_data->flags & MMC_DATA_WRITE)
+			tifm_sd_write_fifo(host, pg, p_off, p_cnt);
+
+		t_size -= p_cnt;
+		host->block_pos += p_cnt;
+	}
+}
+
+static void tifm_sd_copy_page(struct page *dst, unsigned int dst_off,
+			      struct page *src, unsigned int src_off,
+			      unsigned int count)
+{
+	unsigned char *src_buf = kmap_atomic(src) + src_off;
+	unsigned char *dst_buf = kmap_atomic(dst) + dst_off;
+
+	memcpy(dst_buf, src_buf, count);
+
+	kunmap_atomic(dst_buf - dst_off);
+	kunmap_atomic(src_buf - src_off);
+}
+
+static void tifm_sd_bounce_block(struct tifm_sd *host, struct mmc_data *r_data)
+{
+	struct scatterlist *sg = r_data->sg;
+	unsigned int t_size = r_data->blksz;
+	unsigned int off, cnt;
+	unsigned int p_off, p_cnt;
+	struct page *pg;
+
+	dev_dbg(&host->dev->dev, "bouncing block\n");
+	while (t_size) {
+		cnt = sg[host->sg_pos].length - host->block_pos;
+		if (!cnt) {
+			host->block_pos = 0;
+			host->sg_pos++;
+			if (host->sg_pos == host->sg_len)
+				return;
+			cnt = sg[host->sg_pos].length;
+		}
+		off = sg[host->sg_pos].offset + host->block_pos;
+
+		pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
+		p_off = offset_in_page(off);
+		p_cnt = PAGE_SIZE - p_off;
+		p_cnt = min(p_cnt, cnt);
+		p_cnt = min(p_cnt, t_size);
+
+		if (r_data->flags & MMC_DATA_WRITE)
+			tifm_sd_copy_page(sg_page(&host->bounce_buf),
+					  r_data->blksz - t_size,
+					  pg, p_off, p_cnt);
+		else if (r_data->flags & MMC_DATA_READ)
+			tifm_sd_copy_page(pg, p_off, sg_page(&host->bounce_buf),
+					  r_data->blksz - t_size, p_cnt);
+
+		t_size -= p_cnt;
+		host->block_pos += p_cnt;
+	}
+}
+
+static int tifm_sd_set_dma_data(struct tifm_sd *host, struct mmc_data *r_data)
+{
+	struct tifm_dev *sock = host->dev;
+	unsigned int t_size = TIFM_DMA_TSIZE * r_data->blksz;
+	unsigned int dma_len, dma_blk_cnt, dma_off;
+	struct scatterlist *sg = NULL;
+	unsigned long flags;
+
+	if (host->sg_pos == host->sg_len)
+		return 1;
+
+	if (host->cmd_flags & DATA_CARRY) {
+		host->cmd_flags &= ~DATA_CARRY;
+		local_irq_save(flags);
+		tifm_sd_bounce_block(host, r_data);
+		local_irq_restore(flags);
+		if (host->sg_pos == host->sg_len)
+			return 1;
+	}
+
+	dma_len = sg_dma_len(&r_data->sg[host->sg_pos]) - host->block_pos;
+	if (!dma_len) {
+		host->block_pos = 0;
+		host->sg_pos++;
+		if (host->sg_pos == host->sg_len)
+			return 1;
+		dma_len = sg_dma_len(&r_data->sg[host->sg_pos]);
+	}
+
+	if (dma_len < t_size) {
+		dma_blk_cnt = dma_len / r_data->blksz;
+		dma_off = host->block_pos;
+		host->block_pos += dma_blk_cnt * r_data->blksz;
+	} else {
+		dma_blk_cnt = TIFM_DMA_TSIZE;
+		dma_off = host->block_pos;
+		host->block_pos += t_size;
+	}
+
+	if (dma_blk_cnt)
+		sg = &r_data->sg[host->sg_pos];
+	else if (dma_len) {
+		if (r_data->flags & MMC_DATA_WRITE) {
+			local_irq_save(flags);
+			tifm_sd_bounce_block(host, r_data);
+			local_irq_restore(flags);
+		} else
+			host->cmd_flags |= DATA_CARRY;
+
+		sg = &host->bounce_buf;
+		dma_off = 0;
+		dma_blk_cnt = 1;
+	} else
+		return 1;
+
+	dev_dbg(&sock->dev, "setting dma for %d blocks\n", dma_blk_cnt);
+	writel(sg_dma_address(sg) + dma_off, sock->addr + SOCK_DMA_ADDRESS);
+	if (r_data->flags & MMC_DATA_WRITE)
+		writel((dma_blk_cnt << 8) | TIFM_DMA_TX | TIFM_DMA_EN,
+		       sock->addr + SOCK_DMA_CONTROL);
+	else
+		writel((dma_blk_cnt << 8) | TIFM_DMA_EN,
+		       sock->addr + SOCK_DMA_CONTROL);
+
+	return 0;
+}
+
+static unsigned int tifm_sd_op_flags(struct mmc_command *cmd)
+{
+	unsigned int rc = 0;
+
+	switch (mmc_resp_type(cmd)) {
+	case MMC_RSP_NONE:
+		rc |= TIFM_MMCSD_RSP_R0;
+		break;
+	case MMC_RSP_R1B:
+		rc |= TIFM_MMCSD_RSP_BUSY; // deliberate fall-through
+	case MMC_RSP_R1:
+		rc |= TIFM_MMCSD_RSP_R1;
+		break;
+	case MMC_RSP_R2:
+		rc |= TIFM_MMCSD_RSP_R2;
+		break;
+	case MMC_RSP_R3:
+		rc |= TIFM_MMCSD_RSP_R3;
+		break;
+	default:
+		BUG();
+	}
+
+	switch (mmc_cmd_type(cmd)) {
+	case MMC_CMD_BC:
+		rc |= TIFM_MMCSD_CMD_BC;
+		break;
+	case MMC_CMD_BCR:
+		rc |= TIFM_MMCSD_CMD_BCR;
+		break;
+	case MMC_CMD_AC:
+		rc |= TIFM_MMCSD_CMD_AC;
+		break;
+	case MMC_CMD_ADTC:
+		rc |= TIFM_MMCSD_CMD_ADTC;
+		break;
+	default:
+		BUG();
+	}
+	return rc;
+}
+
+static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd)
+{
+	struct tifm_dev *sock = host->dev;
+	unsigned int cmd_mask = tifm_sd_op_flags(cmd);
+
+	if (host->open_drain)
+		cmd_mask |= TIFM_MMCSD_ODTO;
+
+	if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
+		cmd_mask |= TIFM_MMCSD_READ;
+
+	dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n",
+		cmd->opcode, cmd->arg, cmd_mask);
+
+	writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH);
+	writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW);
+	writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND);
+}
+
+static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
+{
+	cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16)
+		       | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18);
+	cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16)
+		       | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10);
+	cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16)
+		       | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08);
+	cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16)
+		       | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
+}
+
+static void tifm_sd_check_status(struct tifm_sd *host)
+{
+	struct tifm_dev *sock = host->dev;
+	struct mmc_command *cmd = host->req->cmd;
+
+	if (cmd->error)
+		goto finish_request;
+
+	if (!(host->cmd_flags & CMD_READY))
+		return;
+
+	if (cmd->data) {
+		if (cmd->data->error) {
+			if ((host->cmd_flags & SCMD_ACTIVE)
+			    && !(host->cmd_flags & SCMD_READY))
+				return;
+
+			goto finish_request;
+		}
+
+		if (!(host->cmd_flags & BRS_READY))
+			return;
+
+		if (!(host->no_dma || (host->cmd_flags & FIFO_READY)))
+			return;
+
+		if (cmd->data->flags & MMC_DATA_WRITE) {
+			if (host->req->stop) {
+				if (!(host->cmd_flags & SCMD_ACTIVE)) {
+					host->cmd_flags |= SCMD_ACTIVE;
+					writel(TIFM_MMCSD_EOFB
+					       | readl(sock->addr
+						       + SOCK_MMCSD_INT_ENABLE),
+					       sock->addr
+					       + SOCK_MMCSD_INT_ENABLE);
+					tifm_sd_exec(host, host->req->stop);
+					return;
+				} else {
+					if (!(host->cmd_flags & SCMD_READY)
+					    || (host->cmd_flags & CARD_BUSY))
+						return;
+					writel((~TIFM_MMCSD_EOFB)
+					       & readl(sock->addr
+						       + SOCK_MMCSD_INT_ENABLE),
+					       sock->addr
+					       + SOCK_MMCSD_INT_ENABLE);
+				}
+			} else {
+				if (host->cmd_flags & CARD_BUSY)
+					return;
+				writel((~TIFM_MMCSD_EOFB)
+				       & readl(sock->addr
+					       + SOCK_MMCSD_INT_ENABLE),
+				       sock->addr + SOCK_MMCSD_INT_ENABLE);
+			}
+		} else {
+			if (host->req->stop) {
+				if (!(host->cmd_flags & SCMD_ACTIVE)) {
+					host->cmd_flags |= SCMD_ACTIVE;
+					tifm_sd_exec(host, host->req->stop);
+					return;
+				} else {
+					if (!(host->cmd_flags & SCMD_READY))
+						return;
+				}
+			}
+		}
+	}
+finish_request:
+	tasklet_schedule(&host->finish_tasklet);
+}
+
+/* Called from interrupt handler */
+static void tifm_sd_data_event(struct tifm_dev *sock)
+{
+	struct tifm_sd *host;
+	unsigned int fifo_status = 0;
+	struct mmc_data *r_data = NULL;
+
+	spin_lock(&sock->lock);
+	host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
+	fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
+	dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n",
+		fifo_status, host->cmd_flags);
+
+	if (host->req) {
+		r_data = host->req->cmd->data;
+
+		if (r_data && (fifo_status & TIFM_FIFO_READY)) {
+			if (tifm_sd_set_dma_data(host, r_data)) {
+				host->cmd_flags |= FIFO_READY;
+				tifm_sd_check_status(host);
+			}
+		}
+	}
+
+	writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
+	spin_unlock(&sock->lock);
+}
+
+/* Called from interrupt handler */
+static void tifm_sd_card_event(struct tifm_dev *sock)
+{
+	struct tifm_sd *host;
+	unsigned int host_status = 0;
+	int cmd_error = 0;
+	struct mmc_command *cmd = NULL;
+	unsigned long flags;
+
+	spin_lock(&sock->lock);
+	host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
+	host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
+	dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
+		host_status, host->cmd_flags);
+
+	if (host->req) {
+		cmd = host->req->cmd;
+
+		if (host_status & TIFM_MMCSD_ERRMASK) {
+			writel(host_status & TIFM_MMCSD_ERRMASK,
+			       sock->addr + SOCK_MMCSD_STATUS);
+			if (host_status & TIFM_MMCSD_CTO)
+				cmd_error = -ETIMEDOUT;
+			else if (host_status & TIFM_MMCSD_CCRC)
+				cmd_error = -EILSEQ;
+
+			if (cmd->data) {
+				if (host_status & TIFM_MMCSD_DTO)
+					cmd->data->error = -ETIMEDOUT;
+				else if (host_status & TIFM_MMCSD_DCRC)
+					cmd->data->error = -EILSEQ;
+			}
+
+			writel(TIFM_FIFO_INT_SETALL,
+			       sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
+			writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
+
+			if (host->req->stop) {
+				if (host->cmd_flags & SCMD_ACTIVE) {
+					host->req->stop->error = cmd_error;
+					host->cmd_flags |= SCMD_READY;
+				} else {
+					cmd->error = cmd_error;
+					host->cmd_flags |= SCMD_ACTIVE;
+					tifm_sd_exec(host, host->req->stop);
+					goto done;
+				}
+			} else
+				cmd->error = cmd_error;
+		} else {
+			if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
+				if (!(host->cmd_flags & CMD_READY)) {
+					host->cmd_flags |= CMD_READY;
+					tifm_sd_fetch_resp(cmd, sock);
+				} else if (host->cmd_flags & SCMD_ACTIVE) {
+					host->cmd_flags |= SCMD_READY;
+					tifm_sd_fetch_resp(host->req->stop,
+							   sock);
+				}
+			}
+			if (host_status & TIFM_MMCSD_BRS)
+				host->cmd_flags |= BRS_READY;
+		}
+
+		if (host->no_dma && cmd->data) {
+			if (host_status & TIFM_MMCSD_AE)
+				writel(host_status & TIFM_MMCSD_AE,
+				       sock->addr + SOCK_MMCSD_STATUS);
+
+			if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF
+					   | TIFM_MMCSD_BRS)) {
+				local_irq_save(flags);
+				tifm_sd_transfer_data(host);
+				local_irq_restore(flags);
+				host_status &= ~TIFM_MMCSD_AE;
+			}
+		}
+
+		if (host_status & TIFM_MMCSD_EOFB)
+			host->cmd_flags &= ~CARD_BUSY;
+		else if (host_status & TIFM_MMCSD_CB)
+			host->cmd_flags |= CARD_BUSY;
+
+		tifm_sd_check_status(host);
+	}
+done:
+	writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
+	spin_unlock(&sock->lock);
+}
+
+static void tifm_sd_set_data_timeout(struct tifm_sd *host,
+				     struct mmc_data *data)
+{
+	struct tifm_dev *sock = host->dev;
+	unsigned int data_timeout = data->timeout_clks;
+
+	if (fixed_timeout)
+		return;
+
+	data_timeout += data->timeout_ns /
+			((1000000000UL / host->clk_freq) * host->clk_div);
+
+	if (data_timeout < 0xffff) {
+		writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
+		writel((~TIFM_MMCSD_DPE)
+		       & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
+		       sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
+	} else {
+		data_timeout = (data_timeout >> 10) + 1;
+		if (data_timeout > 0xffff)
+			data_timeout = 0;	/* set to unlimited */
+		writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
+		writel(TIFM_MMCSD_DPE
+		       | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
+		       sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
+	}
+}
+
+static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct tifm_sd *host = mmc_priv(mmc);
+	struct tifm_dev *sock = host->dev;
+	unsigned long flags;
+	struct mmc_data *r_data = mrq->cmd->data;
+
+	spin_lock_irqsave(&sock->lock, flags);
+	if (host->eject) {
+		mrq->cmd->error = -ENOMEDIUM;
+		goto err_out;
+	}
+
+	if (host->req) {
+		pr_err("%s : unfinished request detected\n",
+		       dev_name(&sock->dev));
+		mrq->cmd->error = -ETIMEDOUT;
+		goto err_out;
+	}
+
+	host->cmd_flags = 0;
+	host->block_pos = 0;
+	host->sg_pos = 0;
+
+	if (mrq->data && !is_power_of_2(mrq->data->blksz))
+		host->no_dma = 1;
+	else
+		host->no_dma = no_dma ? 1 : 0;
+
+	if (r_data) {
+		tifm_sd_set_data_timeout(host, r_data);
+
+		if ((r_data->flags & MMC_DATA_WRITE) && !mrq->stop)
+			 writel(TIFM_MMCSD_EOFB
+				| readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
+				sock->addr + SOCK_MMCSD_INT_ENABLE);
+
+		if (host->no_dma) {
+			writel(TIFM_MMCSD_BUFINT
+			       | readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
+			       sock->addr + SOCK_MMCSD_INT_ENABLE);
+			writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8)
+			       | (TIFM_MMCSD_FIFO_SIZE - 1),
+			       sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
+
+			host->sg_len = r_data->sg_len;
+		} else {
+			sg_init_one(&host->bounce_buf, host->bounce_buf_data,
+				    r_data->blksz);
+
+			if(1 != tifm_map_sg(sock, &host->bounce_buf, 1,
+					    r_data->flags & MMC_DATA_WRITE
+					    ? PCI_DMA_TODEVICE
+					    : PCI_DMA_FROMDEVICE)) {
+				pr_err("%s : scatterlist map failed\n",
+				       dev_name(&sock->dev));
+				mrq->cmd->error = -ENOMEM;
+				goto err_out;
+			}
+			host->sg_len = tifm_map_sg(sock, r_data->sg,
+						   r_data->sg_len,
+						   r_data->flags
+						   & MMC_DATA_WRITE
+						   ? PCI_DMA_TODEVICE
+						   : PCI_DMA_FROMDEVICE);
+			if (host->sg_len < 1) {
+				pr_err("%s : scatterlist map failed\n",
+				       dev_name(&sock->dev));
+				tifm_unmap_sg(sock, &host->bounce_buf, 1,
+					      r_data->flags & MMC_DATA_WRITE
+					      ? PCI_DMA_TODEVICE
+					      : PCI_DMA_FROMDEVICE);
+				mrq->cmd->error = -ENOMEM;
+				goto err_out;
+			}
+
+			writel(TIFM_FIFO_INT_SETALL,
+			       sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
+			writel(ilog2(r_data->blksz) - 2,
+			       sock->addr + SOCK_FIFO_PAGE_SIZE);
+			writel(TIFM_FIFO_ENABLE,
+			       sock->addr + SOCK_FIFO_CONTROL);
+			writel(TIFM_FIFO_INTMASK,
+			       sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
+
+			if (r_data->flags & MMC_DATA_WRITE)
+				writel(TIFM_MMCSD_TXDE,
+				       sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
+			else
+				writel(TIFM_MMCSD_RXDE,
+				       sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
+
+			tifm_sd_set_dma_data(host, r_data);
+		}
+
+		writel(r_data->blocks - 1,
+		       sock->addr + SOCK_MMCSD_NUM_BLOCKS);
+		writel(r_data->blksz - 1,
+		       sock->addr + SOCK_MMCSD_BLOCK_LEN);
+	}
+
+	host->req = mrq;
+	mod_timer(&host->timer, jiffies + host->timeout_jiffies);
+	writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
+	       sock->addr + SOCK_CONTROL);
+	tifm_sd_exec(host, mrq->cmd);
+	spin_unlock_irqrestore(&sock->lock, flags);
+	return;
+
+err_out:
+	spin_unlock_irqrestore(&sock->lock, flags);
+	mmc_request_done(mmc, mrq);
+}
+
+static void tifm_sd_end_cmd(unsigned long data)
+{
+	struct tifm_sd *host = (struct tifm_sd*)data;
+	struct tifm_dev *sock = host->dev;
+	struct mmc_host *mmc = tifm_get_drvdata(sock);
+	struct mmc_request *mrq;
+	struct mmc_data *r_data = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sock->lock, flags);
+
+	del_timer(&host->timer);
+	mrq = host->req;
+	host->req = NULL;
+
+	if (!mrq) {
+		pr_err(" %s : no request to complete?\n",
+		       dev_name(&sock->dev));
+		spin_unlock_irqrestore(&sock->lock, flags);
+		return;
+	}
+
+	r_data = mrq->cmd->data;
+	if (r_data) {
+		if (host->no_dma) {
+			writel((~TIFM_MMCSD_BUFINT)
+			       & readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
+			       sock->addr + SOCK_MMCSD_INT_ENABLE);
+		} else {
+			tifm_unmap_sg(sock, &host->bounce_buf, 1,
+				      (r_data->flags & MMC_DATA_WRITE)
+				      ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+			tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
+				      (r_data->flags & MMC_DATA_WRITE)
+				      ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+		}
+
+		r_data->bytes_xfered = r_data->blocks
+			- readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1;
+		r_data->bytes_xfered *= r_data->blksz;
+		r_data->bytes_xfered += r_data->blksz
+			- readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1;
+	}
+
+	writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
+	       sock->addr + SOCK_CONTROL);
+
+	spin_unlock_irqrestore(&sock->lock, flags);
+	mmc_request_done(mmc, mrq);
+}
+
+static void tifm_sd_abort(unsigned long data)
+{
+	struct tifm_sd *host = (struct tifm_sd*)data;
+
+	pr_err("%s : card failed to respond for a long period of time "
+	       "(%x, %x)\n",
+	       dev_name(&host->dev->dev), host->req->cmd->opcode, host->cmd_flags);
+
+	tifm_eject(host->dev);
+}
+
+static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct tifm_sd *host = mmc_priv(mmc);
+	struct tifm_dev *sock = host->dev;
+	unsigned int clk_div1, clk_div2;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sock->lock, flags);
+
+	dev_dbg(&sock->dev, "ios: clock = %u, vdd = %x, bus_mode = %x, "
+		"chip_select = %x, power_mode = %x, bus_width = %x\n",
+		ios->clock, ios->vdd, ios->bus_mode, ios->chip_select,
+		ios->power_mode, ios->bus_width);
+
+	if (ios->bus_width == MMC_BUS_WIDTH_4) {
+		writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG),
+		       sock->addr + SOCK_MMCSD_CONFIG);
+	} else {
+		writel((~TIFM_MMCSD_4BBUS)
+		       & readl(sock->addr + SOCK_MMCSD_CONFIG),
+		       sock->addr + SOCK_MMCSD_CONFIG);
+	}
+
+	if (ios->clock) {
+		clk_div1 = 20000000 / ios->clock;
+		if (!clk_div1)
+			clk_div1 = 1;
+
+		clk_div2 = 24000000 / ios->clock;
+		if (!clk_div2)
+			clk_div2 = 1;
+
+		if ((20000000 / clk_div1) > ios->clock)
+			clk_div1++;
+		if ((24000000 / clk_div2) > ios->clock)
+			clk_div2++;
+		if ((20000000 / clk_div1) > (24000000 / clk_div2)) {
+			host->clk_freq = 20000000;
+			host->clk_div = clk_div1;
+			writel((~TIFM_CTRL_FAST_CLK)
+			       & readl(sock->addr + SOCK_CONTROL),
+			       sock->addr + SOCK_CONTROL);
+		} else {
+			host->clk_freq = 24000000;
+			host->clk_div = clk_div2;
+			writel(TIFM_CTRL_FAST_CLK
+			       | readl(sock->addr + SOCK_CONTROL),
+			       sock->addr + SOCK_CONTROL);
+		}
+	} else {
+		host->clk_div = 0;
+	}
+	host->clk_div &= TIFM_MMCSD_CLKMASK;
+	writel(host->clk_div
+	       | ((~TIFM_MMCSD_CLKMASK)
+		  & readl(sock->addr + SOCK_MMCSD_CONFIG)),
+	       sock->addr + SOCK_MMCSD_CONFIG);
+
+	host->open_drain = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN);
+
+	/* chip_select : maybe later */
+	//vdd
+	//power is set before probe / after remove
+
+	spin_unlock_irqrestore(&sock->lock, flags);
+}
+
+static int tifm_sd_ro(struct mmc_host *mmc)
+{
+	int rc = 0;
+	struct tifm_sd *host = mmc_priv(mmc);
+	struct tifm_dev *sock = host->dev;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sock->lock, flags);
+	if (TIFM_MMCSD_CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE))
+		rc = 1;
+	spin_unlock_irqrestore(&sock->lock, flags);
+	return rc;
+}
+
+static const struct mmc_host_ops tifm_sd_ops = {
+	.request = tifm_sd_request,
+	.set_ios = tifm_sd_ios,
+	.get_ro  = tifm_sd_ro
+};
+
+static int tifm_sd_initialize_host(struct tifm_sd *host)
+{
+	int rc;
+	unsigned int host_status = 0;
+	struct tifm_dev *sock = host->dev;
+
+	writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
+	mmiowb();
+	host->clk_div = 61;
+	host->clk_freq = 20000000;
+	writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
+	writel(host->clk_div | TIFM_MMCSD_POWER,
+	       sock->addr + SOCK_MMCSD_CONFIG);
+
+	/* wait up to 0.51 sec for reset */
+	for (rc = 32; rc <= 256; rc <<= 1) {
+		if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
+			rc = 0;
+			break;
+		}
+		msleep(rc);
+	}
+
+	if (rc) {
+		pr_err("%s : controller failed to reset\n",
+		       dev_name(&sock->dev));
+		return -ENODEV;
+	}
+
+	writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
+	writel(host->clk_div | TIFM_MMCSD_POWER,
+	       sock->addr + SOCK_MMCSD_CONFIG);
+	writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
+
+	// command timeout fixed to 64 clocks for now
+	writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO);
+	writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
+
+	for (rc = 16; rc <= 64; rc <<= 1) {
+		host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
+		writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
+		if (!(host_status & TIFM_MMCSD_ERRMASK)
+		    && (host_status & TIFM_MMCSD_EOC)) {
+			rc = 0;
+			break;
+		}
+		msleep(rc);
+	}
+
+	if (rc) {
+		pr_err("%s : card not ready - probe failed on initialization\n",
+		       dev_name(&sock->dev));
+		return -ENODEV;
+	}
+
+	writel(TIFM_MMCSD_CERR | TIFM_MMCSD_BRS | TIFM_MMCSD_EOC
+	       | TIFM_MMCSD_ERRMASK,
+	       sock->addr + SOCK_MMCSD_INT_ENABLE);
+	mmiowb();
+
+	return 0;
+}
+
+static int tifm_sd_probe(struct tifm_dev *sock)
+{
+	struct mmc_host *mmc;
+	struct tifm_sd *host;
+	int rc = -EIO;
+
+	if (!(TIFM_SOCK_STATE_OCCUPIED
+	      & readl(sock->addr + SOCK_PRESENT_STATE))) {
+		pr_warn("%s : card gone, unexpectedly\n",
+			dev_name(&sock->dev));
+		return rc;
+	}
+
+	mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
+	if (!mmc)
+		return -ENOMEM;
+
+	host = mmc_priv(mmc);
+	tifm_set_drvdata(sock, mmc);
+	host->dev = sock;
+	host->timeout_jiffies = msecs_to_jiffies(1000);
+
+	tasklet_init(&host->finish_tasklet, tifm_sd_end_cmd,
+		     (unsigned long)host);
+	setup_timer(&host->timer, tifm_sd_abort, (unsigned long)host);
+
+	mmc->ops = &tifm_sd_ops;
+	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+	mmc->caps = MMC_CAP_4_BIT_DATA;
+	mmc->f_min = 20000000 / 60;
+	mmc->f_max = 24000000;
+
+	mmc->max_blk_count = 2048;
+	mmc->max_segs = mmc->max_blk_count;
+	mmc->max_blk_size = min(TIFM_MMCSD_MAX_BLOCK_SIZE, PAGE_SIZE);
+	mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size;
+	mmc->max_req_size = mmc->max_seg_size;
+
+	sock->card_event = tifm_sd_card_event;
+	sock->data_event = tifm_sd_data_event;
+	rc = tifm_sd_initialize_host(host);
+
+	if (!rc)
+		rc = mmc_add_host(mmc);
+	if (!rc)
+		return 0;
+
+	mmc_free_host(mmc);
+	return rc;
+}
+
+static void tifm_sd_remove(struct tifm_dev *sock)
+{
+	struct mmc_host *mmc = tifm_get_drvdata(sock);
+	struct tifm_sd *host = mmc_priv(mmc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&sock->lock, flags);
+	host->eject = 1;
+	writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
+	mmiowb();
+	spin_unlock_irqrestore(&sock->lock, flags);
+
+	tasklet_kill(&host->finish_tasklet);
+
+	spin_lock_irqsave(&sock->lock, flags);
+	if (host->req) {
+		writel(TIFM_FIFO_INT_SETALL,
+		       sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
+		writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
+		host->req->cmd->error = -ENOMEDIUM;
+		if (host->req->stop)
+			host->req->stop->error = -ENOMEDIUM;
+		tasklet_schedule(&host->finish_tasklet);
+	}
+	spin_unlock_irqrestore(&sock->lock, flags);
+	mmc_remove_host(mmc);
+	dev_dbg(&sock->dev, "after remove\n");
+
+	mmc_free_host(mmc);
+}
+
+#ifdef CONFIG_PM
+
+static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state)
+{
+	return 0;
+}
+
+static int tifm_sd_resume(struct tifm_dev *sock)
+{
+	struct mmc_host *mmc = tifm_get_drvdata(sock);
+	struct tifm_sd *host = mmc_priv(mmc);
+	int rc;
+
+	rc = tifm_sd_initialize_host(host);
+	dev_dbg(&sock->dev, "resume initialize %d\n", rc);
+
+	if (rc)
+		host->eject = 1;
+
+	return rc;
+}
+
+#else
+
+#define tifm_sd_suspend NULL
+#define tifm_sd_resume NULL
+
+#endif /* CONFIG_PM */
+
+static struct tifm_device_id tifm_sd_id_tbl[] = {
+	{ TIFM_TYPE_SD }, { }
+};
+
+static struct tifm_driver tifm_sd_driver = {
+	.driver = {
+		.name  = DRIVER_NAME,
+		.owner = THIS_MODULE
+	},
+	.id_table = tifm_sd_id_tbl,
+	.probe    = tifm_sd_probe,
+	.remove   = tifm_sd_remove,
+	.suspend  = tifm_sd_suspend,
+	.resume   = tifm_sd_resume
+};
+
+static int __init tifm_sd_init(void)
+{
+	return tifm_register_driver(&tifm_sd_driver);
+}
+
+static void __exit tifm_sd_exit(void)
+{
+	tifm_unregister_driver(&tifm_sd_driver);
+}
+
+MODULE_AUTHOR("Alex Dubov");
+MODULE_DESCRIPTION("TI FlashMedia SD driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl);
+MODULE_VERSION(DRIVER_VERSION);
+
+module_init(tifm_sd_init);
+module_exit(tifm_sd_exit);