Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 1078 insertions, 0 deletions

diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
new file mode 100644
index 00000000..9a7996ad
--- /dev/null
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -0,0 +1,1078 @@
+/*
+ * linux/drivers/mmc/host/tmio_mmc_pio.c
+ *
+ * Copyright (C) 2011 Guennadi Liakhovetski
+ * Copyright (C) 2007 Ian Molton
+ * Copyright (C) 2004 Ian Molton
+ *
+ * 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.
+ *
+ * Driver for the MMC / SD / SDIO IP found in:
+ *
+ * TC6393XB, TC6391XB, TC6387XB, T7L66XB, ASIC3, SH-Mobile SoCs
+ *
+ * This driver draws mainly on scattered spec sheets, Reverse engineering
+ * of the toshiba e800  SD driver and some parts of the 2.4 ASIC3 driver (4 bit
+ * support). (Further 4 bit support from a later datasheet).
+ *
+ * TODO:
+ *   Investigate using a workqueue for PIO transfers
+ *   Eliminate FIXMEs
+ *   SDIO support
+ *   Better Power management
+ *   Handle MMC errors better
+ *   double buffer support
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/highmem.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/mfd/tmio.h>
+#include <linux/mmc/cd-gpio.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/tmio.h>
+#include <linux/module.h>
+#include <linux/pagemap.h>
+#include <linux/platform_device.h>
+#include <linux/pm_qos.h>
+#include <linux/pm_runtime.h>
+#include <linux/scatterlist.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+
+#include "tmio_mmc.h"
+
+void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
+{
+	host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ);
+	sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
+}
+
+void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
+{
+	host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ);
+	sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
+}
+
+static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
+{
+	sd_ctrl_write32(host, CTL_STATUS, ~i);
+}
+
+static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
+{
+	host->sg_len = data->sg_len;
+	host->sg_ptr = data->sg;
+	host->sg_orig = data->sg;
+	host->sg_off = 0;
+}
+
+static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
+{
+	host->sg_ptr = sg_next(host->sg_ptr);
+	host->sg_off = 0;
+	return --host->sg_len;
+}
+
+#ifdef CONFIG_MMC_DEBUG
+
+#define STATUS_TO_TEXT(a, status, i) \
+	do { \
+		if (status & TMIO_STAT_##a) { \
+			if (i++) \
+				printk(" | "); \
+			printk(#a); \
+		} \
+	} while (0)
+
+static void pr_debug_status(u32 status)
+{
+	int i = 0;
+	pr_debug("status: %08x = ", status);
+	STATUS_TO_TEXT(CARD_REMOVE, status, i);
+	STATUS_TO_TEXT(CARD_INSERT, status, i);
+	STATUS_TO_TEXT(SIGSTATE, status, i);
+	STATUS_TO_TEXT(WRPROTECT, status, i);
+	STATUS_TO_TEXT(CARD_REMOVE_A, status, i);
+	STATUS_TO_TEXT(CARD_INSERT_A, status, i);
+	STATUS_TO_TEXT(SIGSTATE_A, status, i);
+	STATUS_TO_TEXT(CMD_IDX_ERR, status, i);
+	STATUS_TO_TEXT(STOPBIT_ERR, status, i);
+	STATUS_TO_TEXT(ILL_FUNC, status, i);
+	STATUS_TO_TEXT(CMD_BUSY, status, i);
+	STATUS_TO_TEXT(CMDRESPEND, status, i);
+	STATUS_TO_TEXT(DATAEND, status, i);
+	STATUS_TO_TEXT(CRCFAIL, status, i);
+	STATUS_TO_TEXT(DATATIMEOUT, status, i);
+	STATUS_TO_TEXT(CMDTIMEOUT, status, i);
+	STATUS_TO_TEXT(RXOVERFLOW, status, i);
+	STATUS_TO_TEXT(TXUNDERRUN, status, i);
+	STATUS_TO_TEXT(RXRDY, status, i);
+	STATUS_TO_TEXT(TXRQ, status, i);
+	STATUS_TO_TEXT(ILL_ACCESS, status, i);
+	printk("\n");
+}
+
+#else
+#define pr_debug_status(s)  do { } while (0)
+#endif
+
+static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+
+	if (enable) {
+		host->sdio_irq_mask = TMIO_SDIO_MASK_ALL &
+					~TMIO_SDIO_STAT_IOIRQ;
+		sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
+		sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
+	} else {
+		host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
+		sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
+		sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
+	}
+}
+
+static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
+{
+	u32 clk = 0, clock;
+
+	if (new_clock) {
+		for (clock = host->mmc->f_min, clk = 0x80000080;
+			new_clock >= (clock<<1); clk >>= 1)
+			clock <<= 1;
+		clk |= 0x100;
+	}
+
+	if (host->set_clk_div)
+		host->set_clk_div(host->pdev, (clk>>22) & 1);
+
+	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & 0x1ff);
+}
+
+static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
+{
+	struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
+
+	/* implicit BUG_ON(!res) */
+	if (resource_size(res) > 0x100) {
+		sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
+		msleep(10);
+	}
+
+	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
+		sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+	msleep(10);
+}
+
+static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
+{
+	struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
+
+	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
+		sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+	msleep(10);
+
+	/* implicit BUG_ON(!res) */
+	if (resource_size(res) > 0x100) {
+		sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
+		msleep(10);
+	}
+}
+
+static void tmio_mmc_reset(struct tmio_mmc_host *host)
+{
+	struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
+
+	/* FIXME - should we set stop clock reg here */
+	sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
+	/* implicit BUG_ON(!res) */
+	if (resource_size(res) > 0x100)
+		sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
+	msleep(10);
+	sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
+	if (resource_size(res) > 0x100)
+		sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
+	msleep(10);
+}
+
+static void tmio_mmc_reset_work(struct work_struct *work)
+{
+	struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
+						  delayed_reset_work.work);
+	struct mmc_request *mrq;
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+	mrq = host->mrq;
+
+	/*
+	 * is request already finished? Since we use a non-blocking
+	 * cancel_delayed_work(), it can happen, that a .set_ios() call preempts
+	 * us, so, have to check for IS_ERR(host->mrq)
+	 */
+	if (IS_ERR_OR_NULL(mrq)
+	    || time_is_after_jiffies(host->last_req_ts +
+		msecs_to_jiffies(2000))) {
+		spin_unlock_irqrestore(&host->lock, flags);
+		return;
+	}
+
+	dev_warn(&host->pdev->dev,
+		"timeout waiting for hardware interrupt (CMD%u)\n",
+		mrq->cmd->opcode);
+
+	if (host->data)
+		host->data->error = -ETIMEDOUT;
+	else if (host->cmd)
+		host->cmd->error = -ETIMEDOUT;
+	else
+		mrq->cmd->error = -ETIMEDOUT;
+
+	host->cmd = NULL;
+	host->data = NULL;
+	host->force_pio = false;
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	tmio_mmc_reset(host);
+
+	/* Ready for new calls */
+	host->mrq = NULL;
+
+	tmio_mmc_abort_dma(host);
+	mmc_request_done(host->mmc, mrq);
+}
+
+/* called with host->lock held, interrupts disabled */
+static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
+{
+	struct mmc_request *mrq;
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	mrq = host->mrq;
+	if (IS_ERR_OR_NULL(mrq)) {
+		spin_unlock_irqrestore(&host->lock, flags);
+		return;
+	}
+
+	host->cmd = NULL;
+	host->data = NULL;
+	host->force_pio = false;
+
+	cancel_delayed_work(&host->delayed_reset_work);
+
+	host->mrq = NULL;
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	if (mrq->cmd->error || (mrq->data && mrq->data->error))
+		tmio_mmc_abort_dma(host);
+
+	mmc_request_done(host->mmc, mrq);
+}
+
+static void tmio_mmc_done_work(struct work_struct *work)
+{
+	struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
+						  done);
+	tmio_mmc_finish_request(host);
+}
+
+/* These are the bitmasks the tmio chip requires to implement the MMC response
+ * types. Note that R1 and R6 are the same in this scheme. */
+#define APP_CMD        0x0040
+#define RESP_NONE      0x0300
+#define RESP_R1        0x0400
+#define RESP_R1B       0x0500
+#define RESP_R2        0x0600
+#define RESP_R3        0x0700
+#define DATA_PRESENT   0x0800
+#define TRANSFER_READ  0x1000
+#define TRANSFER_MULTI 0x2000
+#define SECURITY_CMD   0x4000
+
+static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
+{
+	struct mmc_data *data = host->data;
+	int c = cmd->opcode;
+	u32 irq_mask = TMIO_MASK_CMD;
+
+	/* Command 12 is handled by hardware */
+	if (cmd->opcode == 12 && !cmd->arg) {
+		sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x001);
+		return 0;
+	}
+
+	switch (mmc_resp_type(cmd)) {
+	case MMC_RSP_NONE: c |= RESP_NONE; break;
+	case MMC_RSP_R1:   c |= RESP_R1;   break;
+	case MMC_RSP_R1B:  c |= RESP_R1B;  break;
+	case MMC_RSP_R2:   c |= RESP_R2;   break;
+	case MMC_RSP_R3:   c |= RESP_R3;   break;
+	default:
+		pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
+		return -EINVAL;
+	}
+
+	host->cmd = cmd;
+
+/* FIXME - this seems to be ok commented out but the spec suggest this bit
+ *         should be set when issuing app commands.
+ *	if(cmd->flags & MMC_FLAG_ACMD)
+ *		c |= APP_CMD;
+ */
+	if (data) {
+		c |= DATA_PRESENT;
+		if (data->blocks > 1) {
+			sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x100);
+			c |= TRANSFER_MULTI;
+		}
+		if (data->flags & MMC_DATA_READ)
+			c |= TRANSFER_READ;
+	}
+
+	if (!host->native_hotplug)
+		irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
+	tmio_mmc_enable_mmc_irqs(host, irq_mask);
+
+	/* Fire off the command */
+	sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
+	sd_ctrl_write16(host, CTL_SD_CMD, c);
+
+	return 0;
+}
+
+/*
+ * This chip always returns (at least?) as much data as you ask for.
+ * I'm unsure what happens if you ask for less than a block. This should be
+ * looked into to ensure that a funny length read doesn't hose the controller.
+ */
+static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
+{
+	struct mmc_data *data = host->data;
+	void *sg_virt;
+	unsigned short *buf;
+	unsigned int count;
+	unsigned long flags;
+
+	if ((host->chan_tx || host->chan_rx) && !host->force_pio) {
+		pr_err("PIO IRQ in DMA mode!\n");
+		return;
+	} else if (!data) {
+		pr_debug("Spurious PIO IRQ\n");
+		return;
+	}
+
+	sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
+	buf = (unsigned short *)(sg_virt + host->sg_off);
+
+	count = host->sg_ptr->length - host->sg_off;
+	if (count > data->blksz)
+		count = data->blksz;
+
+	pr_debug("count: %08x offset: %08x flags %08x\n",
+		 count, host->sg_off, data->flags);
+
+	/* Transfer the data */
+	if (data->flags & MMC_DATA_READ)
+		sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
+	else
+		sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
+
+	host->sg_off += count;
+
+	tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
+
+	if (host->sg_off == host->sg_ptr->length)
+		tmio_mmc_next_sg(host);
+
+	return;
+}
+
+static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host)
+{
+	if (host->sg_ptr == &host->bounce_sg) {
+		unsigned long flags;
+		void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags);
+		memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length);
+		tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr);
+	}
+}
+
+/* needs to be called with host->lock held */
+void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
+{
+	struct mmc_data *data = host->data;
+	struct mmc_command *stop;
+
+	host->data = NULL;
+
+	if (!data) {
+		dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
+		return;
+	}
+	stop = data->stop;
+
+	/* FIXME - return correct transfer count on errors */
+	if (!data->error)
+		data->bytes_xfered = data->blocks * data->blksz;
+	else
+		data->bytes_xfered = 0;
+
+	pr_debug("Completed data request\n");
+
+	/*
+	 * FIXME: other drivers allow an optional stop command of any given type
+	 *        which we dont do, as the chip can auto generate them.
+	 *        Perhaps we can be smarter about when to use auto CMD12 and
+	 *        only issue the auto request when we know this is the desired
+	 *        stop command, allowing fallback to the stop command the
+	 *        upper layers expect. For now, we do what works.
+	 */
+
+	if (data->flags & MMC_DATA_READ) {
+		if (host->chan_rx && !host->force_pio)
+			tmio_mmc_check_bounce_buffer(host);
+		dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
+			host->mrq);
+	} else {
+		dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
+			host->mrq);
+	}
+
+	if (stop) {
+		if (stop->opcode == 12 && !stop->arg)
+			sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000);
+		else
+			BUG();
+	}
+
+	schedule_work(&host->done);
+}
+
+static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
+{
+	struct mmc_data *data;
+	spin_lock(&host->lock);
+	data = host->data;
+
+	if (!data)
+		goto out;
+
+	if (host->chan_tx && (data->flags & MMC_DATA_WRITE) && !host->force_pio) {
+		/*
+		 * Has all data been written out yet? Testing on SuperH showed,
+		 * that in most cases the first interrupt comes already with the
+		 * BUSY status bit clear, but on some operations, like mount or
+		 * in the beginning of a write / sync / umount, there is one
+		 * DATAEND interrupt with the BUSY bit set, in this cases
+		 * waiting for one more interrupt fixes the problem.
+		 */
+		if (!(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_CMD_BUSY)) {
+			tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
+			tasklet_schedule(&host->dma_complete);
+		}
+	} else if (host->chan_rx && (data->flags & MMC_DATA_READ) && !host->force_pio) {
+		tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
+		tasklet_schedule(&host->dma_complete);
+	} else {
+		tmio_mmc_do_data_irq(host);
+		tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
+	}
+out:
+	spin_unlock(&host->lock);
+}
+
+static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
+	unsigned int stat)
+{
+	struct mmc_command *cmd = host->cmd;
+	int i, addr;
+
+	spin_lock(&host->lock);
+
+	if (!host->cmd) {
+		pr_debug("Spurious CMD irq\n");
+		goto out;
+	}
+
+	host->cmd = NULL;
+
+	/* This controller is sicker than the PXA one. Not only do we need to
+	 * drop the top 8 bits of the first response word, we also need to
+	 * modify the order of the response for short response command types.
+	 */
+
+	for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
+		cmd->resp[i] = sd_ctrl_read32(host, addr);
+
+	if (cmd->flags &  MMC_RSP_136) {
+		cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
+		cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
+		cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
+		cmd->resp[3] <<= 8;
+	} else if (cmd->flags & MMC_RSP_R3) {
+		cmd->resp[0] = cmd->resp[3];
+	}
+
+	if (stat & TMIO_STAT_CMDTIMEOUT)
+		cmd->error = -ETIMEDOUT;
+	else if (stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC)
+		cmd->error = -EILSEQ;
+
+	/* If there is data to handle we enable data IRQs here, and
+	 * we will ultimatley finish the request in the data_end handler.
+	 * If theres no data or we encountered an error, finish now.
+	 */
+	if (host->data && !cmd->error) {
+		if (host->data->flags & MMC_DATA_READ) {
+			if (host->force_pio || !host->chan_rx)
+				tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
+			else
+				tasklet_schedule(&host->dma_issue);
+		} else {
+			if (host->force_pio || !host->chan_tx)
+				tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
+			else
+				tasklet_schedule(&host->dma_issue);
+		}
+	} else {
+		schedule_work(&host->done);
+	}
+
+out:
+	spin_unlock(&host->lock);
+}
+
+static void tmio_mmc_card_irq_status(struct tmio_mmc_host *host,
+				       int *ireg, int *status)
+{
+	*status = sd_ctrl_read32(host, CTL_STATUS);
+	*ireg = *status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask;
+
+	pr_debug_status(*status);
+	pr_debug_status(*ireg);
+}
+
+static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host,
+				      int ireg, int status)
+{
+	struct mmc_host *mmc = host->mmc;
+
+	/* Card insert / remove attempts */
+	if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
+		tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
+			TMIO_STAT_CARD_REMOVE);
+		if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) ||
+		     ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) &&
+		    !work_pending(&mmc->detect.work))
+			mmc_detect_change(host->mmc, msecs_to_jiffies(100));
+		return true;
+	}
+
+	return false;
+}
+
+irqreturn_t tmio_mmc_card_detect_irq(int irq, void *devid)
+{
+	unsigned int ireg, status;
+	struct tmio_mmc_host *host = devid;
+
+	tmio_mmc_card_irq_status(host, &ireg, &status);
+	__tmio_mmc_card_detect_irq(host, ireg, status);
+
+	return IRQ_HANDLED;
+}
+EXPORT_SYMBOL(tmio_mmc_card_detect_irq);
+
+static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host,
+				 int ireg, int status)
+{
+	/* Command completion */
+	if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
+		tmio_mmc_ack_mmc_irqs(host,
+			     TMIO_STAT_CMDRESPEND |
+			     TMIO_STAT_CMDTIMEOUT);
+		tmio_mmc_cmd_irq(host, status);
+		return true;
+	}
+
+	/* Data transfer */
+	if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
+		tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
+		tmio_mmc_pio_irq(host);
+		return true;
+	}
+
+	/* Data transfer completion */
+	if (ireg & TMIO_STAT_DATAEND) {
+		tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND);
+		tmio_mmc_data_irq(host);
+		return true;
+	}
+
+	return false;
+}
+
+irqreturn_t tmio_mmc_sdcard_irq(int irq, void *devid)
+{
+	unsigned int ireg, status;
+	struct tmio_mmc_host *host = devid;
+
+	tmio_mmc_card_irq_status(host, &ireg, &status);
+	__tmio_mmc_sdcard_irq(host, ireg, status);
+
+	return IRQ_HANDLED;
+}
+EXPORT_SYMBOL(tmio_mmc_sdcard_irq);
+
+irqreturn_t tmio_mmc_sdio_irq(int irq, void *devid)
+{
+	struct tmio_mmc_host *host = devid;
+	struct mmc_host *mmc = host->mmc;
+	struct tmio_mmc_data *pdata = host->pdata;
+	unsigned int ireg, status;
+
+	if (!(pdata->flags & TMIO_MMC_SDIO_IRQ))
+		return IRQ_HANDLED;
+
+	status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
+	ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdcard_irq_mask;
+
+	sd_ctrl_write16(host, CTL_SDIO_STATUS, status & ~TMIO_SDIO_MASK_ALL);
+
+	if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ)
+		mmc_signal_sdio_irq(mmc);
+
+	return IRQ_HANDLED;
+}
+EXPORT_SYMBOL(tmio_mmc_sdio_irq);
+
+irqreturn_t tmio_mmc_irq(int irq, void *devid)
+{
+	struct tmio_mmc_host *host = devid;
+	unsigned int ireg, status;
+
+	pr_debug("MMC IRQ begin\n");
+
+	tmio_mmc_card_irq_status(host, &ireg, &status);
+	if (__tmio_mmc_card_detect_irq(host, ireg, status))
+		return IRQ_HANDLED;
+	if (__tmio_mmc_sdcard_irq(host, ireg, status))
+		return IRQ_HANDLED;
+
+	tmio_mmc_sdio_irq(irq, devid);
+
+	return IRQ_HANDLED;
+}
+EXPORT_SYMBOL(tmio_mmc_irq);
+
+static int tmio_mmc_start_data(struct tmio_mmc_host *host,
+	struct mmc_data *data)
+{
+	struct tmio_mmc_data *pdata = host->pdata;
+
+	pr_debug("setup data transfer: blocksize %08x  nr_blocks %d\n",
+		 data->blksz, data->blocks);
+
+	/* Some hardware cannot perform 2 byte requests in 4 bit mode */
+	if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
+		int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
+
+		if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
+			pr_err("%s: %d byte block unsupported in 4 bit mode\n",
+			       mmc_hostname(host->mmc), data->blksz);
+			return -EINVAL;
+		}
+	}
+
+	tmio_mmc_init_sg(host, data);
+	host->data = data;
+
+	/* Set transfer length / blocksize */
+	sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
+	sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
+
+	tmio_mmc_start_dma(host, data);
+
+	return 0;
+}
+
+/* Process requests from the MMC layer */
+static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	if (host->mrq) {
+		pr_debug("request not null\n");
+		if (IS_ERR(host->mrq)) {
+			spin_unlock_irqrestore(&host->lock, flags);
+			mrq->cmd->error = -EAGAIN;
+			mmc_request_done(mmc, mrq);
+			return;
+		}
+	}
+
+	host->last_req_ts = jiffies;
+	wmb();
+	host->mrq = mrq;
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	if (mrq->data) {
+		ret = tmio_mmc_start_data(host, mrq->data);
+		if (ret)
+			goto fail;
+	}
+
+	ret = tmio_mmc_start_command(host, mrq->cmd);
+	if (!ret) {
+		schedule_delayed_work(&host->delayed_reset_work,
+				      msecs_to_jiffies(2000));
+		return;
+	}
+
+fail:
+	host->force_pio = false;
+	host->mrq = NULL;
+	mrq->cmd->error = ret;
+	mmc_request_done(mmc, mrq);
+}
+
+/* Set MMC clock / power.
+ * Note: This controller uses a simple divider scheme therefore it cannot
+ * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
+ * MMC wont run that fast, it has to be clocked at 12MHz which is the next
+ * slowest setting.
+ */
+static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+	struct device *dev = &host->pdev->dev;
+	unsigned long flags;
+
+	mutex_lock(&host->ios_lock);
+
+	spin_lock_irqsave(&host->lock, flags);
+	if (host->mrq) {
+		if (IS_ERR(host->mrq)) {
+			dev_dbg(dev,
+				"%s.%d: concurrent .set_ios(), clk %u, mode %u\n",
+				current->comm, task_pid_nr(current),
+				ios->clock, ios->power_mode);
+			host->mrq = ERR_PTR(-EINTR);
+		} else {
+			dev_dbg(dev,
+				"%s.%d: CMD%u active since %lu, now %lu!\n",
+				current->comm, task_pid_nr(current),
+				host->mrq->cmd->opcode, host->last_req_ts, jiffies);
+		}
+		spin_unlock_irqrestore(&host->lock, flags);
+
+		mutex_unlock(&host->ios_lock);
+		return;
+	}
+
+	host->mrq = ERR_PTR(-EBUSY);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	/*
+	 * host->power toggles between false and true in both cases - either
+	 * or not the controller can be runtime-suspended during inactivity.
+	 * But if the controller has to be kept on, the runtime-pm usage_count
+	 * is kept positive, so no suspending actually takes place.
+	 */
+	if (ios->power_mode == MMC_POWER_ON && ios->clock) {
+		if (!host->power) {
+			pm_runtime_get_sync(dev);
+			host->power = true;
+		}
+		tmio_mmc_set_clock(host, ios->clock);
+		/* power up SD bus */
+		if (host->set_pwr)
+			host->set_pwr(host->pdev, 1);
+		/* start bus clock */
+		tmio_mmc_clk_start(host);
+	} else if (ios->power_mode != MMC_POWER_UP) {
+		if (host->set_pwr && ios->power_mode == MMC_POWER_OFF)
+			host->set_pwr(host->pdev, 0);
+		if (host->power) {
+			host->power = false;
+			pm_runtime_put(dev);
+		}
+		tmio_mmc_clk_stop(host);
+	}
+
+	switch (ios->bus_width) {
+	case MMC_BUS_WIDTH_1:
+		sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
+	break;
+	case MMC_BUS_WIDTH_4:
+		sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
+	break;
+	}
+
+	/* Let things settle. delay taken from winCE driver */
+	udelay(140);
+	if (PTR_ERR(host->mrq) == -EINTR)
+		dev_dbg(&host->pdev->dev,
+			"%s.%d: IOS interrupted: clk %u, mode %u",
+			current->comm, task_pid_nr(current),
+			ios->clock, ios->power_mode);
+	host->mrq = NULL;
+
+	mutex_unlock(&host->ios_lock);
+}
+
+static int tmio_mmc_get_ro(struct mmc_host *mmc)
+{
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+	struct tmio_mmc_data *pdata = host->pdata;
+
+	return !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
+		 (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
+}
+
+static int tmio_mmc_get_cd(struct mmc_host *mmc)
+{
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+	struct tmio_mmc_data *pdata = host->pdata;
+
+	if (!pdata->get_cd)
+		return -ENOSYS;
+	else
+		return pdata->get_cd(host->pdev);
+}
+
+static const struct mmc_host_ops tmio_mmc_ops = {
+	.request	= tmio_mmc_request,
+	.set_ios	= tmio_mmc_set_ios,
+	.get_ro         = tmio_mmc_get_ro,
+	.get_cd		= tmio_mmc_get_cd,
+	.enable_sdio_irq = tmio_mmc_enable_sdio_irq,
+};
+
+int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host,
+				  struct platform_device *pdev,
+				  struct tmio_mmc_data *pdata)
+{
+	struct tmio_mmc_host *_host;
+	struct mmc_host *mmc;
+	struct resource *res_ctl;
+	int ret;
+	u32 irq_mask = TMIO_MASK_CMD;
+
+	res_ctl = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res_ctl)
+		return -EINVAL;
+
+	mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
+	if (!mmc)
+		return -ENOMEM;
+
+	pdata->dev = &pdev->dev;
+	_host = mmc_priv(mmc);
+	_host->pdata = pdata;
+	_host->mmc = mmc;
+	_host->pdev = pdev;
+	platform_set_drvdata(pdev, mmc);
+
+	_host->set_pwr = pdata->set_pwr;
+	_host->set_clk_div = pdata->set_clk_div;
+
+	/* SD control register space size is 0x200, 0x400 for bus_shift=1 */
+	_host->bus_shift = resource_size(res_ctl) >> 10;
+
+	_host->ctl = ioremap(res_ctl->start, resource_size(res_ctl));
+	if (!_host->ctl) {
+		ret = -ENOMEM;
+		goto host_free;
+	}
+
+	mmc->ops = &tmio_mmc_ops;
+	mmc->caps = MMC_CAP_4_BIT_DATA | pdata->capabilities;
+	mmc->f_max = pdata->hclk;
+	mmc->f_min = mmc->f_max / 512;
+	mmc->max_segs = 32;
+	mmc->max_blk_size = 512;
+	mmc->max_blk_count = (PAGE_CACHE_SIZE / mmc->max_blk_size) *
+		mmc->max_segs;
+	mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
+	mmc->max_seg_size = mmc->max_req_size;
+	if (pdata->ocr_mask)
+		mmc->ocr_avail = pdata->ocr_mask;
+	else
+		mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+
+	_host->native_hotplug = !(pdata->flags & TMIO_MMC_USE_GPIO_CD ||
+				  mmc->caps & MMC_CAP_NEEDS_POLL ||
+				  mmc->caps & MMC_CAP_NONREMOVABLE);
+
+	_host->power = false;
+	pm_runtime_enable(&pdev->dev);
+	ret = pm_runtime_resume(&pdev->dev);
+	if (ret < 0)
+		goto pm_disable;
+
+	/*
+	 * There are 4 different scenarios for the card detection:
+	 *  1) an external gpio irq handles the cd (best for power savings)
+	 *  2) internal sdhi irq handles the cd
+	 *  3) a worker thread polls the sdhi - indicated by MMC_CAP_NEEDS_POLL
+	 *  4) the medium is non-removable - indicated by MMC_CAP_NONREMOVABLE
+	 *
+	 *  While we increment the runtime PM counter for all scenarios when
+	 *  the mmc core activates us by calling an appropriate set_ios(), we
+	 *  must additionally ensure that in case 2) the tmio mmc hardware stays
+	 *  additionally ensure that in case 2) the tmio mmc hardware stays
+	 *  powered on during runtime for the card detection to work.
+	 */
+	if (_host->native_hotplug)
+		pm_runtime_get_noresume(&pdev->dev);
+
+	tmio_mmc_clk_stop(_host);
+	tmio_mmc_reset(_host);
+
+	_host->sdcard_irq_mask = sd_ctrl_read32(_host, CTL_IRQ_MASK);
+	tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
+	if (pdata->flags & TMIO_MMC_SDIO_IRQ)
+		tmio_mmc_enable_sdio_irq(mmc, 0);
+
+	spin_lock_init(&_host->lock);
+	mutex_init(&_host->ios_lock);
+
+	/* Init delayed work for request timeouts */
+	INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
+	INIT_WORK(&_host->done, tmio_mmc_done_work);
+
+	/* See if we also get DMA */
+	tmio_mmc_request_dma(_host, pdata);
+
+	mmc_add_host(mmc);
+
+	dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
+
+	/* Unmask the IRQs we want to know about */
+	if (!_host->chan_rx)
+		irq_mask |= TMIO_MASK_READOP;
+	if (!_host->chan_tx)
+		irq_mask |= TMIO_MASK_WRITEOP;
+	if (!_host->native_hotplug)
+		irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
+
+	tmio_mmc_enable_mmc_irqs(_host, irq_mask);
+
+	if (pdata->flags & TMIO_MMC_USE_GPIO_CD) {
+		ret = mmc_cd_gpio_request(mmc, pdata->cd_gpio);
+		if (ret < 0) {
+			tmio_mmc_host_remove(_host);
+			return ret;
+		}
+	}
+
+	*host = _host;
+
+	return 0;
+
+pm_disable:
+	pm_runtime_disable(&pdev->dev);
+	iounmap(_host->ctl);
+host_free:
+	mmc_free_host(mmc);
+
+	return ret;
+}
+EXPORT_SYMBOL(tmio_mmc_host_probe);
+
+void tmio_mmc_host_remove(struct tmio_mmc_host *host)
+{
+	struct platform_device *pdev = host->pdev;
+	struct tmio_mmc_data *pdata = host->pdata;
+	struct mmc_host *mmc = host->mmc;
+
+	if (pdata->flags & TMIO_MMC_USE_GPIO_CD)
+		/*
+		 * This means we can miss a card-eject, but this is anyway
+		 * possible, because of delayed processing of hotplug events.
+		 */
+		mmc_cd_gpio_free(mmc);
+
+	if (!host->native_hotplug)
+		pm_runtime_get_sync(&pdev->dev);
+
+	dev_pm_qos_hide_latency_limit(&pdev->dev);
+
+	mmc_remove_host(mmc);
+	cancel_work_sync(&host->done);
+	cancel_delayed_work_sync(&host->delayed_reset_work);
+	tmio_mmc_release_dma(host);
+
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
+	iounmap(host->ctl);
+	mmc_free_host(mmc);
+}
+EXPORT_SYMBOL(tmio_mmc_host_remove);
+
+#ifdef CONFIG_PM
+int tmio_mmc_host_suspend(struct device *dev)
+{
+	struct mmc_host *mmc = dev_get_drvdata(dev);
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+	int ret = mmc_suspend_host(mmc);
+
+	if (!ret)
+		tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
+
+	return ret;
+}
+EXPORT_SYMBOL(tmio_mmc_host_suspend);
+
+int tmio_mmc_host_resume(struct device *dev)
+{
+	struct mmc_host *mmc = dev_get_drvdata(dev);
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+
+	tmio_mmc_reset(host);
+	tmio_mmc_enable_dma(host, true);
+
+	/* The MMC core will perform the complete set up */
+	return mmc_resume_host(mmc);
+}
+EXPORT_SYMBOL(tmio_mmc_host_resume);
+
+#endif	/* CONFIG_PM */
+
+int tmio_mmc_host_runtime_suspend(struct device *dev)
+{
+	return 0;
+}
+EXPORT_SYMBOL(tmio_mmc_host_runtime_suspend);
+
+int tmio_mmc_host_runtime_resume(struct device *dev)
+{
+	struct mmc_host *mmc = dev_get_drvdata(dev);
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+
+	tmio_mmc_reset(host);
+	tmio_mmc_enable_dma(host, true);
+
+	return 0;
+}
+EXPORT_SYMBOL(tmio_mmc_host_runtime_resume);
+
+MODULE_LICENSE("GPL v2");