[PATCH] mmc: driver for TI FlashMedia card reader - source

Driver for TI Flash Media card reader.  At present, only MMC/SD cards are
supported.

[akpm@osdl.org: cleanups, build fixes]
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Cc: Daniel Qarras <dqarras@yahoo.com>
Acked-by: Pierre Ossman <drzeus@drzeus.cx>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 933 insertions, 0 deletions

diff --git a/drivers/mmc/tifm_sd.c b/drivers/mmc/tifm_sd.c
new file mode 100644
index 0000000..6d23dc0
--- /dev/null
+++ b/drivers/mmc/tifm_sd.c
@@ -0,0 +1,933 @@
+/*
+ *  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.
+ *
+ */
+
+
+#include <linux/tifm.h>
+#include <linux/mmc/protocol.h>
+#include <linux/mmc/host.h>
+#include <linux/highmem.h>
+
+#define DRIVER_NAME "tifm_sd"
+#define DRIVER_VERSION "0.6"
+
+static int no_dma = 0;
+static int 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_DATAMASK   0x001d   /* set bits: EOFB, BRS, CB, EOC */
+#define TIFM_MMCSD_ERRMASK    0x41e0   /* set bits: CERR, CCRC, CTO, DCRC, DTO */
+#define TIFM_MMCSD_EOC        0x0001   /* end of command phase  */
+#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_CERR       0x4000   /* card status error     */
+
+#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
+
+typedef enum {
+	IDLE = 0,
+	CMD,    /* main command ended                   */
+	BRS,    /* block transfer finished              */
+	SCMD,   /* stop command ended                   */
+	CARD,   /* card left busy state                 */
+	FIFO,   /* FIFO operation completed (uncertain) */
+	READY
+} card_state_t;
+
+enum {
+	FIFO_RDY   = 0x0001,     /* hardware dependent value */
+	HOST_REG   = 0x0002,
+	EJECT      = 0x0004,
+	EJECT_DONE = 0x0008,
+	CARD_BUSY  = 0x0010,
+	OPENDRAIN  = 0x0040,     /* hardware dependent value */
+	CARD_EVENT = 0x0100,     /* hardware dependent value */
+	CARD_RO    = 0x0200,     /* hardware dependent value */
+	FIFO_EVENT = 0x10000 };  /* hardware dependent value */
+
+struct tifm_sd {
+	struct tifm_dev     *dev;
+
+	unsigned int        flags;
+	card_state_t        state;
+	unsigned int        clk_freq;
+	unsigned int        clk_div;
+	unsigned long       timeout_jiffies; // software timeout - 2 sec
+
+	struct mmc_request    *req;
+	struct work_struct    cmd_handler;
+	struct work_struct    abort_handler;
+	wait_queue_head_t     can_eject;
+
+	size_t                written_blocks;
+	char                  *buffer;
+	size_t                buffer_size;
+	size_t                buffer_pos;
+
+};
+
+static int tifm_sd_transfer_data(struct tifm_dev *sock, struct tifm_sd *host,
+					unsigned int host_status)
+{
+	struct mmc_command *cmd = host->req->cmd;
+	unsigned int t_val = 0, cnt = 0;
+
+	if (host_status & TIFM_MMCSD_BRS) {
+		/* in non-dma rx mode BRS fires when fifo is still not empty */
+		if (host->buffer && (cmd->data->flags & MMC_DATA_READ)) {
+			while (host->buffer_size > host->buffer_pos) {
+				t_val = readl(sock->addr + SOCK_MMCSD_DATA);
+				host->buffer[host->buffer_pos++] = t_val & 0xff;
+				host->buffer[host->buffer_pos++] =
+							(t_val >> 8) & 0xff;
+			}
+		}
+		return 1;
+	} else if (host->buffer) {
+		if ((cmd->data->flags & MMC_DATA_READ) &&
+				(host_status & TIFM_MMCSD_AF)) {
+			for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
+				t_val = readl(sock->addr + SOCK_MMCSD_DATA);
+				if (host->buffer_size > host->buffer_pos) {
+					host->buffer[host->buffer_pos++] =
+							t_val & 0xff;
+					host->buffer[host->buffer_pos++] =
+							(t_val >> 8) & 0xff;
+				}
+			}
+		} else if ((cmd->data->flags & MMC_DATA_WRITE)
+			   && (host_status & TIFM_MMCSD_AE)) {
+			for (cnt = 0; cnt < TIFM_MMCSD_FIFO_SIZE; cnt++) {
+				if (host->buffer_size > host->buffer_pos) {
+					t_val = host->buffer[host->buffer_pos++] & 0x00ff;
+					t_val |= ((host->buffer[host->buffer_pos++]) << 8)
+						 & 0xff00;
+					writel(t_val,
+						sock->addr + SOCK_MMCSD_DATA);
+				}
+			}
+		}
+	}
+	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;
+	case MMC_RSP_R6:
+		rc |= TIFM_MMCSD_RSP_R6;
+		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) |
+				(host->flags & OPENDRAIN);
+
+	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_process_cmd(struct tifm_dev *sock, struct tifm_sd *host,
+				       unsigned int host_status)
+{
+	struct mmc_command *cmd = host->req->cmd;
+
+change_state:
+	switch (host->state) {
+	case IDLE:
+		return;
+	case CMD:
+		if (host_status & TIFM_MMCSD_EOC) {
+			tifm_sd_fetch_resp(cmd, sock);
+			if (cmd->data) {
+				host->state = BRS;
+			} else
+				host->state = READY;
+			goto change_state;
+		}
+		break;
+	case BRS:
+		if (tifm_sd_transfer_data(sock, host, host_status)) {
+			if (!host->req->stop) {
+				if (cmd->data->flags & MMC_DATA_WRITE) {
+					host->state = CARD;
+				} else {
+					host->state =
+						host->buffer ? READY : FIFO;
+				}
+				goto change_state;
+			}
+			tifm_sd_exec(host, host->req->stop);
+			host->state = SCMD;
+		}
+		break;
+	case SCMD:
+		if (host_status & TIFM_MMCSD_EOC) {
+			tifm_sd_fetch_resp(host->req->stop, sock);
+			if (cmd->error) {
+				host->state = READY;
+			} else if (cmd->data->flags & MMC_DATA_WRITE) {
+				host->state = CARD;
+			} else {
+				host->state = host->buffer ? READY : FIFO;
+			}
+			goto change_state;
+		}
+		break;
+	case CARD:
+		if (!(host->flags & CARD_BUSY)
+		    && (host->written_blocks == cmd->data->blocks)) {
+			host->state = host->buffer ? READY : FIFO;
+			goto change_state;
+		}
+		break;
+	case FIFO:
+		if (host->flags & FIFO_RDY) {
+			host->state = READY;
+			host->flags &= ~FIFO_RDY;
+			goto change_state;
+		}
+		break;
+	case READY:
+		queue_work(sock->wq, &host->cmd_handler);
+		return;
+	}
+
+	queue_delayed_work(sock->wq, &host->abort_handler,
+				host->timeout_jiffies);
+}
+
+/* Called from interrupt handler */
+static unsigned int tifm_sd_signal_irq(struct tifm_dev *sock,
+					unsigned int sock_irq_status)
+{
+	struct tifm_sd *host;
+	unsigned int host_status = 0, fifo_status = 0;
+	int error_code = 0;
+
+	spin_lock(&sock->lock);
+	host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
+	cancel_delayed_work(&host->abort_handler);
+
+	if (sock_irq_status & FIFO_EVENT) {
+		fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
+		writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
+
+		host->flags |= fifo_status & FIFO_RDY;
+	}
+
+	if (sock_irq_status & CARD_EVENT) {
+		host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
+		writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
+
+		if (!(host->flags & HOST_REG))
+			queue_work(sock->wq, &host->cmd_handler);
+		if (!host->req)
+			goto done;
+
+		if (host_status & TIFM_MMCSD_ERRMASK) {
+			if (host_status & TIFM_MMCSD_CERR)
+				error_code = MMC_ERR_FAILED;
+			else if (host_status &
+					(TIFM_MMCSD_CTO | TIFM_MMCSD_DTO))
+				error_code = MMC_ERR_TIMEOUT;
+			else if (host_status &
+					(TIFM_MMCSD_CCRC | TIFM_MMCSD_DCRC))
+				error_code = MMC_ERR_BADCRC;
+
+			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->state == SCMD) {
+					host->req->stop->error = error_code;
+				} else if(host->state == BRS) {
+					host->req->cmd->error = error_code;
+					tifm_sd_exec(host, host->req->stop);
+					queue_delayed_work(sock->wq,
+						&host->abort_handler,
+						host->timeout_jiffies);
+					host->state = SCMD;
+					goto done;
+				} else {
+					host->req->cmd->error = error_code;
+				}
+			} else {
+				host->req->cmd->error = error_code;
+			}
+			host->state = READY;
+		}
+
+		if (host_status & TIFM_MMCSD_CB)
+			host->flags |= CARD_BUSY;
+		if ((host_status & TIFM_MMCSD_EOFB) &&
+				(host->flags & CARD_BUSY)) {
+			host->written_blocks++;
+			host->flags &= ~CARD_BUSY;
+		}
+        }
+
+	if (host->req)
+		tifm_sd_process_cmd(sock, host, host_status);
+done:
+	dev_dbg(&sock->dev, "host_status %x, fifo_status %x\n",
+			host_status, fifo_status);
+	spin_unlock(&sock->lock);
+	return sock_irq_status;
+}
+
+static void tifm_sd_prepare_data(struct tifm_sd *card, struct mmc_command *cmd)
+{
+	struct tifm_dev *sock = card->dev;
+	unsigned int dest_cnt;
+
+	/* DMA style IO */
+
+	writel(TIFM_FIFO_INT_SETALL,
+		sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
+	writel(long_log2(cmd->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);
+
+	dest_cnt = (cmd->data->blocks) << 8;
+
+	writel(sg_dma_address(cmd->data->sg), sock->addr + SOCK_DMA_ADDRESS);
+
+	writel(cmd->data->blocks - 1, sock->addr + SOCK_MMCSD_NUM_BLOCKS);
+	writel(cmd->data->blksz - 1, sock->addr + SOCK_MMCSD_BLOCK_LEN);
+
+	if (cmd->data->flags & MMC_DATA_WRITE) {
+		writel(TIFM_MMCSD_TXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
+		writel(dest_cnt | TIFM_DMA_TX | TIFM_DMA_EN,
+			sock->addr + SOCK_DMA_CONTROL);
+	} else {
+		writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG);
+		writel(dest_cnt | TIFM_DMA_EN, sock->addr + SOCK_DMA_CONTROL);
+	}
+}
+
+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 /
+			((1000000000 / host->clk_freq) * host->clk_div);
+	data_timeout *= 10; // call it fudge factor for now
+
+	if (data_timeout < 0xffff) {
+		writel((~TIFM_MMCSD_DPE) &
+				readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
+		       sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
+		writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO);
+	} else {
+		writel(TIFM_MMCSD_DPE |
+				readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG),
+			sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG);
+		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);
+	}
+}
+
+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;
+	int sg_count = 0;
+	struct mmc_data *r_data = mrq->cmd->data;
+
+	spin_lock_irqsave(&sock->lock, flags);
+	if (host->flags & EJECT) {
+		spin_unlock_irqrestore(&sock->lock, flags);
+		goto err_out;
+	}
+
+	if (host->req) {
+		printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
+		spin_unlock_irqrestore(&sock->lock, flags);
+		goto err_out;
+	}
+
+	if (r_data) {
+		tifm_sd_set_data_timeout(host, r_data);
+
+		sg_count = tifm_map_sg(sock, r_data->sg, r_data->sg_len,
+				       mrq->cmd->flags & MMC_DATA_WRITE
+				       ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+		if (sg_count != 1) {
+			printk(KERN_ERR DRIVER_NAME
+				": scatterlist map failed\n");
+			spin_unlock_irqrestore(&sock->lock, flags);
+			goto err_out;
+		}
+
+		host->written_blocks = 0;
+		host->flags &= ~CARD_BUSY;
+		tifm_sd_prepare_data(host, mrq->cmd);
+	}
+
+	host->req = mrq;
+	host->state = CMD;
+	queue_delayed_work(sock->wq, &host->abort_handler,
+				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:
+	if (sg_count > 0)
+		tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
+			      (r_data->flags & MMC_DATA_WRITE)
+			      ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+
+	mrq->cmd->error = MMC_ERR_TIMEOUT;
+	mmc_request_done(mmc, mrq);
+}
+
+static void tifm_sd_end_cmd(void *data)
+{
+	struct tifm_sd *host = data;
+	struct tifm_dev *sock = host->dev;
+	struct mmc_host *mmc = tifm_get_drvdata(sock);
+	struct mmc_request *mrq;
+	struct mmc_data *r_data = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sock->lock, flags);
+
+	mrq = host->req;
+	host->req = 0;
+	host->state = IDLE;
+
+	if (!mrq) {
+		printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
+		spin_unlock_irqrestore(&sock->lock, flags);
+		return;
+	}
+
+	r_data = mrq->cmd->data;
+	if (r_data) {
+		if (r_data->flags & MMC_DATA_WRITE) {
+			r_data->bytes_xfered = host->written_blocks *
+						r_data->blksz;
+		} else {
+			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;
+		}
+		tifm_unmap_sg(sock, r_data->sg, r_data->sg_len,
+			      (r_data->flags & MMC_DATA_WRITE)
+			      ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+	}
+
+	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_request_nodma(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;
+	char *t_buffer = 0;
+
+	if (r_data) {
+		t_buffer = kmap(r_data->sg->page);
+		if (!t_buffer) {
+			printk(KERN_ERR DRIVER_NAME ": kmap failed\n");
+			goto err_out;
+		}
+	}
+
+	spin_lock_irqsave(&sock->lock, flags);
+	if (host->flags & EJECT) {
+		spin_unlock_irqrestore(&sock->lock, flags);
+		goto err_out;
+	}
+
+	if (host->req) {
+		printk(KERN_ERR DRIVER_NAME ": unfinished request detected\n");
+		spin_unlock_irqrestore(&sock->lock, flags);
+		goto err_out;
+	}
+
+	if (r_data) {
+		tifm_sd_set_data_timeout(host, r_data);
+
+		host->buffer = t_buffer + r_data->sg->offset;
+		host->buffer_size = mrq->cmd->data->blocks *
+					mrq->cmd->data->blksz;
+
+		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->written_blocks = 0;
+		host->flags &= ~CARD_BUSY;
+		host->buffer_pos = 0;
+		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;
+	host->state = CMD;
+	queue_delayed_work(sock->wq, &host->abort_handler,
+				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:
+	if (t_buffer)
+		kunmap(r_data->sg->page);
+
+	mrq->cmd->error = MMC_ERR_TIMEOUT;
+	mmc_request_done(mmc, mrq);
+}
+
+static void tifm_sd_end_cmd_nodma(void *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 = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sock->lock, flags);
+
+	mrq = host->req;
+	host->req = 0;
+	host->state = IDLE;
+
+	if (!mrq) {
+		printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
+		spin_unlock_irqrestore(&sock->lock, flags);
+		return;
+	}
+
+	r_data = mrq->cmd->data;
+	if (r_data) {
+		writel((~TIFM_MMCSD_BUFINT) &
+			readl(sock->addr + SOCK_MMCSD_INT_ENABLE),
+			sock->addr + SOCK_MMCSD_INT_ENABLE);
+
+		if (r_data->flags & MMC_DATA_WRITE) {
+			r_data->bytes_xfered = host->written_blocks *
+						r_data->blksz;
+		} else {
+			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;
+		}
+		host->buffer = 0;
+		host->buffer_pos = 0;
+		host->buffer_size = 0;
+	}
+
+	writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL),
+			sock->addr + SOCK_CONTROL);
+
+	spin_unlock_irqrestore(&sock->lock, flags);
+
+        if (r_data)
+		kunmap(r_data->sg->page);
+
+	mmc_request_done(mmc, mrq);
+}
+
+static void tifm_sd_abort(void *data)
+{
+	printk(KERN_ERR DRIVER_NAME
+		": card failed to respond for a long period of time");
+	tifm_eject(((struct tifm_sd*)data)->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, "Setting bus width %d, power %d\n", ios->bus_width,
+		ios->power_mode);
+	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);
+
+	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
+		host->flags |= OPENDRAIN;
+	else
+		host->flags &= ~OPENDRAIN;
+
+	/* chip_select : maybe later */
+	//vdd
+	//power is set before probe / after remove
+	//I believe, power_off when already marked for eject is sufficient to
+	// allow removal.
+	if ((host->flags & EJECT) && ios->power_mode == MMC_POWER_OFF) {
+		host->flags |= EJECT_DONE;
+		wake_up_all(&host->can_eject);
+	}
+
+	spin_unlock_irqrestore(&sock->lock, flags);
+}
+
+static int tifm_sd_ro(struct mmc_host *mmc)
+{
+	int rc;
+	struct tifm_sd *host = mmc_priv(mmc);
+	struct tifm_dev *sock = host->dev;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sock->lock, flags);
+
+	host->flags |= (CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE));
+	rc = (host->flags & CARD_RO) ? 1 : 0;
+
+	spin_unlock_irqrestore(&sock->lock, flags);
+	return rc;
+}
+
+static struct mmc_host_ops tifm_sd_ops = {
+	.request = tifm_sd_request,
+	.set_ios = tifm_sd_ios,
+	.get_ro  = tifm_sd_ro
+};
+
+static void tifm_sd_register_host(void *data)
+{
+	struct tifm_sd *host = (struct tifm_sd*)data;
+	struct tifm_dev *sock = host->dev;
+	struct mmc_host *mmc = tifm_get_drvdata(sock);
+	unsigned long flags;
+
+	spin_lock_irqsave(&sock->lock, flags);
+	host->flags |= HOST_REG;
+	PREPARE_WORK(&host->cmd_handler,
+			no_dma ? tifm_sd_end_cmd_nodma : tifm_sd_end_cmd,
+			data);
+	spin_unlock_irqrestore(&sock->lock, flags);
+	dev_dbg(&sock->dev, "adding host\n");
+	mmc_add_host(mmc);
+}
+
+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))) {
+		printk(KERN_WARNING DRIVER_NAME ": card gone, unexpectedly\n");
+		return rc;
+	}
+
+	mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev);
+	if (!mmc)
+		return -ENOMEM;
+
+	host = mmc_priv(mmc);
+	host->dev = sock;
+	host->clk_div = 61;
+	init_waitqueue_head(&host->can_eject);
+	INIT_WORK(&host->cmd_handler, tifm_sd_register_host, host);
+	INIT_WORK(&host->abort_handler, tifm_sd_abort, host);
+
+	tifm_set_drvdata(sock, mmc);
+	sock->signal_irq = tifm_sd_signal_irq;
+
+	host->clk_freq = 20000000;
+	host->timeout_jiffies = msecs_to_jiffies(1000);
+
+	tifm_sd_ops.request = no_dma ? tifm_sd_request_nodma : tifm_sd_request;
+	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_hw_segs = 1;
+	mmc->max_phys_segs = 1;
+	mmc->max_sectors = 127;
+	mmc->max_seg_size = mmc->max_sectors << 11; //2k maximum hw block length
+
+	writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
+	writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
+	writel(host->clk_div | TIFM_MMCSD_POWER,
+			sock->addr + SOCK_MMCSD_CONFIG);
+
+	for (rc = 0; rc < 50; rc++) {
+		/* Wait for reset ack */
+		if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) {
+			rc = 0;
+			break;
+		}
+		msleep(10);
+        }
+
+	if (rc) {
+		printk(KERN_ERR DRIVER_NAME
+			": card not ready - probe failed\n");
+		mmc_free_host(mmc);
+		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);
+	writel(TIFM_MMCSD_DATAMASK | TIFM_MMCSD_ERRMASK,
+			sock->addr + SOCK_MMCSD_INT_ENABLE);
+
+	writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO); // command timeout 64 clocks for now
+	writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND);
+	writel(host->clk_div | TIFM_MMCSD_POWER,
+			sock->addr + SOCK_MMCSD_CONFIG);
+
+	queue_delayed_work(sock->wq, &host->abort_handler,
+			host->timeout_jiffies);
+
+	return 0;
+}
+
+static int tifm_sd_host_is_down(struct tifm_dev *sock)
+{
+	struct mmc_host *mmc = tifm_get_drvdata(sock);
+	struct tifm_sd *host = mmc_priv(mmc);
+	unsigned long flags;
+	int rc = 0;
+
+	spin_lock_irqsave(&sock->lock, flags);
+	rc = (host->flags & EJECT_DONE);
+	spin_unlock_irqrestore(&sock->lock, flags);
+	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->flags |= EJECT;
+	if (host->req)
+		queue_work(sock->wq, &host->cmd_handler);
+	spin_unlock_irqrestore(&sock->lock, flags);
+	wait_event_timeout(host->can_eject, tifm_sd_host_is_down(sock),
+				host->timeout_jiffies);
+
+	if (host->flags & HOST_REG)
+		mmc_remove_host(mmc);
+
+	/* The meaning of the bit majority in this constant is unknown. */
+	writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
+		sock->addr + SOCK_CONTROL);
+	writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
+	writel(TIFM_FIFO_INT_SETALL,
+		sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
+	writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
+
+	tifm_set_drvdata(sock, 0);
+	mmc_free_host(mmc);
+}
+
+static tifm_media_id tifm_sd_id_tbl[] = {
+	FM_SD, 0
+};
+
+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
+};
+
+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);