Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4929 insertions, 0 deletions

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
new file mode 100644
index 000000000..bad01cc68
--- /dev/null
+++ b/drivers/mmc/host/sdhci.c
@@ -0,0 +1,4929 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver
+ *
+ *  Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
+ *
+ * Thanks to the following companies for their support:
+ *
+ *     - JMicron (hardware and technical support)
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/ktime.h>
+#include <linux/highmem.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/scatterlist.h>
+#include <linux/sizes.h>
+#include <linux/swiotlb.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+
+#include <linux/leds.h>
+
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/slot-gpio.h>
+
+#include "sdhci.h"
+
+#define DRIVER_NAME "sdhci"
+
+#define DBG(f, x...) \
+	pr_debug("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
+
+#define SDHCI_DUMP(f, x...) \
+	pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
+
+#define MAX_TUNING_LOOP 40
+
+static unsigned int debug_quirks = 0;
+static unsigned int debug_quirks2;
+
+static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
+
+static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd);
+
+void sdhci_dumpregs(struct sdhci_host *host)
+{
+	SDHCI_DUMP("============ SDHCI REGISTER DUMP ===========\n");
+
+	SDHCI_DUMP("Sys addr:  0x%08x | Version:  0x%08x\n",
+		   sdhci_readl(host, SDHCI_DMA_ADDRESS),
+		   sdhci_readw(host, SDHCI_HOST_VERSION));
+	SDHCI_DUMP("Blk size:  0x%08x | Blk cnt:  0x%08x\n",
+		   sdhci_readw(host, SDHCI_BLOCK_SIZE),
+		   sdhci_readw(host, SDHCI_BLOCK_COUNT));
+	SDHCI_DUMP("Argument:  0x%08x | Trn mode: 0x%08x\n",
+		   sdhci_readl(host, SDHCI_ARGUMENT),
+		   sdhci_readw(host, SDHCI_TRANSFER_MODE));
+	SDHCI_DUMP("Present:   0x%08x | Host ctl: 0x%08x\n",
+		   sdhci_readl(host, SDHCI_PRESENT_STATE),
+		   sdhci_readb(host, SDHCI_HOST_CONTROL));
+	SDHCI_DUMP("Power:     0x%08x | Blk gap:  0x%08x\n",
+		   sdhci_readb(host, SDHCI_POWER_CONTROL),
+		   sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
+	SDHCI_DUMP("Wake-up:   0x%08x | Clock:    0x%08x\n",
+		   sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
+		   sdhci_readw(host, SDHCI_CLOCK_CONTROL));
+	SDHCI_DUMP("Timeout:   0x%08x | Int stat: 0x%08x\n",
+		   sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
+		   sdhci_readl(host, SDHCI_INT_STATUS));
+	SDHCI_DUMP("Int enab:  0x%08x | Sig enab: 0x%08x\n",
+		   sdhci_readl(host, SDHCI_INT_ENABLE),
+		   sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
+	SDHCI_DUMP("ACmd stat: 0x%08x | Slot int: 0x%08x\n",
+		   sdhci_readw(host, SDHCI_AUTO_CMD_STATUS),
+		   sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
+	SDHCI_DUMP("Caps:      0x%08x | Caps_1:   0x%08x\n",
+		   sdhci_readl(host, SDHCI_CAPABILITIES),
+		   sdhci_readl(host, SDHCI_CAPABILITIES_1));
+	SDHCI_DUMP("Cmd:       0x%08x | Max curr: 0x%08x\n",
+		   sdhci_readw(host, SDHCI_COMMAND),
+		   sdhci_readl(host, SDHCI_MAX_CURRENT));
+	SDHCI_DUMP("Resp[0]:   0x%08x | Resp[1]:  0x%08x\n",
+		   sdhci_readl(host, SDHCI_RESPONSE),
+		   sdhci_readl(host, SDHCI_RESPONSE + 4));
+	SDHCI_DUMP("Resp[2]:   0x%08x | Resp[3]:  0x%08x\n",
+		   sdhci_readl(host, SDHCI_RESPONSE + 8),
+		   sdhci_readl(host, SDHCI_RESPONSE + 12));
+	SDHCI_DUMP("Host ctl2: 0x%08x\n",
+		   sdhci_readw(host, SDHCI_HOST_CONTROL2));
+
+	if (host->flags & SDHCI_USE_ADMA) {
+		if (host->flags & SDHCI_USE_64_BIT_DMA) {
+			SDHCI_DUMP("ADMA Err:  0x%08x | ADMA Ptr: 0x%08x%08x\n",
+				   sdhci_readl(host, SDHCI_ADMA_ERROR),
+				   sdhci_readl(host, SDHCI_ADMA_ADDRESS_HI),
+				   sdhci_readl(host, SDHCI_ADMA_ADDRESS));
+		} else {
+			SDHCI_DUMP("ADMA Err:  0x%08x | ADMA Ptr: 0x%08x\n",
+				   sdhci_readl(host, SDHCI_ADMA_ERROR),
+				   sdhci_readl(host, SDHCI_ADMA_ADDRESS));
+		}
+	}
+
+	if (host->ops->dump_vendor_regs)
+		host->ops->dump_vendor_regs(host);
+
+	SDHCI_DUMP("============================================\n");
+}
+EXPORT_SYMBOL_GPL(sdhci_dumpregs);
+
+/*****************************************************************************\
+ *                                                                           *
+ * Low level functions                                                       *
+ *                                                                           *
+\*****************************************************************************/
+
+static void sdhci_do_enable_v4_mode(struct sdhci_host *host)
+{
+	u16 ctrl2;
+
+	ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+	if (ctrl2 & SDHCI_CTRL_V4_MODE)
+		return;
+
+	ctrl2 |= SDHCI_CTRL_V4_MODE;
+	sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
+}
+
+/*
+ * This can be called before sdhci_add_host() by Vendor's host controller
+ * driver to enable v4 mode if supported.
+ */
+void sdhci_enable_v4_mode(struct sdhci_host *host)
+{
+	host->v4_mode = true;
+	sdhci_do_enable_v4_mode(host);
+}
+EXPORT_SYMBOL_GPL(sdhci_enable_v4_mode);
+
+static inline bool sdhci_data_line_cmd(struct mmc_command *cmd)
+{
+	return cmd->data || cmd->flags & MMC_RSP_BUSY;
+}
+
+static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
+{
+	u32 present;
+
+	if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
+	    !mmc_card_is_removable(host->mmc) || mmc_can_gpio_cd(host->mmc))
+		return;
+
+	if (enable) {
+		present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
+				      SDHCI_CARD_PRESENT;
+
+		host->ier |= present ? SDHCI_INT_CARD_REMOVE :
+				       SDHCI_INT_CARD_INSERT;
+	} else {
+		host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
+	}
+
+	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
+	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+}
+
+static void sdhci_enable_card_detection(struct sdhci_host *host)
+{
+	sdhci_set_card_detection(host, true);
+}
+
+static void sdhci_disable_card_detection(struct sdhci_host *host)
+{
+	sdhci_set_card_detection(host, false);
+}
+
+static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
+{
+	if (host->bus_on)
+		return;
+	host->bus_on = true;
+	pm_runtime_get_noresume(host->mmc->parent);
+}
+
+static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
+{
+	if (!host->bus_on)
+		return;
+	host->bus_on = false;
+	pm_runtime_put_noidle(host->mmc->parent);
+}
+
+void sdhci_reset(struct sdhci_host *host, u8 mask)
+{
+	ktime_t timeout;
+
+	sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
+
+	if (mask & SDHCI_RESET_ALL) {
+		host->clock = 0;
+		/* Reset-all turns off SD Bus Power */
+		if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
+			sdhci_runtime_pm_bus_off(host);
+	}
+
+	/* Wait max 100 ms */
+	timeout = ktime_add_ms(ktime_get(), 100);
+
+	/* hw clears the bit when it's done */
+	while (1) {
+		bool timedout = ktime_after(ktime_get(), timeout);
+
+		if (!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask))
+			break;
+		if (timedout) {
+			pr_err("%s: Reset 0x%x never completed.\n",
+				mmc_hostname(host->mmc), (int)mask);
+			sdhci_dumpregs(host);
+			return;
+		}
+		udelay(10);
+	}
+}
+EXPORT_SYMBOL_GPL(sdhci_reset);
+
+static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
+{
+	if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
+		struct mmc_host *mmc = host->mmc;
+
+		if (!mmc->ops->get_cd(mmc))
+			return;
+	}
+
+	host->ops->reset(host, mask);
+
+	if (mask & SDHCI_RESET_ALL) {
+		if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
+			if (host->ops->enable_dma)
+				host->ops->enable_dma(host);
+		}
+
+		/* Resetting the controller clears many */
+		host->preset_enabled = false;
+	}
+}
+
+static void sdhci_set_default_irqs(struct sdhci_host *host)
+{
+	host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
+		    SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
+		    SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
+		    SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
+		    SDHCI_INT_RESPONSE;
+
+	if (host->tuning_mode == SDHCI_TUNING_MODE_2 ||
+	    host->tuning_mode == SDHCI_TUNING_MODE_3)
+		host->ier |= SDHCI_INT_RETUNE;
+
+	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
+	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+}
+
+static void sdhci_config_dma(struct sdhci_host *host)
+{
+	u8 ctrl;
+	u16 ctrl2;
+
+	if (host->version < SDHCI_SPEC_200)
+		return;
+
+	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
+
+	/*
+	 * Always adjust the DMA selection as some controllers
+	 * (e.g. JMicron) can't do PIO properly when the selection
+	 * is ADMA.
+	 */
+	ctrl &= ~SDHCI_CTRL_DMA_MASK;
+	if (!(host->flags & SDHCI_REQ_USE_DMA))
+		goto out;
+
+	/* Note if DMA Select is zero then SDMA is selected */
+	if (host->flags & SDHCI_USE_ADMA)
+		ctrl |= SDHCI_CTRL_ADMA32;
+
+	if (host->flags & SDHCI_USE_64_BIT_DMA) {
+		/*
+		 * If v4 mode, all supported DMA can be 64-bit addressing if
+		 * controller supports 64-bit system address, otherwise only
+		 * ADMA can support 64-bit addressing.
+		 */
+		if (host->v4_mode) {
+			ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+			ctrl2 |= SDHCI_CTRL_64BIT_ADDR;
+			sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
+		} else if (host->flags & SDHCI_USE_ADMA) {
+			/*
+			 * Don't need to undo SDHCI_CTRL_ADMA32 in order to
+			 * set SDHCI_CTRL_ADMA64.
+			 */
+			ctrl |= SDHCI_CTRL_ADMA64;
+		}
+	}
+
+out:
+	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+}
+
+static void sdhci_init(struct sdhci_host *host, int soft)
+{
+	struct mmc_host *mmc = host->mmc;
+	unsigned long flags;
+
+	if (soft)
+		sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
+	else
+		sdhci_do_reset(host, SDHCI_RESET_ALL);
+
+	if (host->v4_mode)
+		sdhci_do_enable_v4_mode(host);
+
+	spin_lock_irqsave(&host->lock, flags);
+	sdhci_set_default_irqs(host);
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	host->cqe_on = false;
+
+	if (soft) {
+		/* force clock reconfiguration */
+		host->clock = 0;
+		host->reinit_uhs = true;
+		mmc->ops->set_ios(mmc, &mmc->ios);
+	}
+}
+
+static void sdhci_reinit(struct sdhci_host *host)
+{
+	u32 cd = host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
+
+	sdhci_init(host, 0);
+	sdhci_enable_card_detection(host);
+
+	/*
+	 * A change to the card detect bits indicates a change in present state,
+	 * refer sdhci_set_card_detection(). A card detect interrupt might have
+	 * been missed while the host controller was being reset, so trigger a
+	 * rescan to check.
+	 */
+	if (cd != (host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT)))
+		mmc_detect_change(host->mmc, msecs_to_jiffies(200));
+}
+
+static void __sdhci_led_activate(struct sdhci_host *host)
+{
+	u8 ctrl;
+
+	if (host->quirks & SDHCI_QUIRK_NO_LED)
+		return;
+
+	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
+	ctrl |= SDHCI_CTRL_LED;
+	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+}
+
+static void __sdhci_led_deactivate(struct sdhci_host *host)
+{
+	u8 ctrl;
+
+	if (host->quirks & SDHCI_QUIRK_NO_LED)
+		return;
+
+	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
+	ctrl &= ~SDHCI_CTRL_LED;
+	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+}
+
+#if IS_REACHABLE(CONFIG_LEDS_CLASS)
+static void sdhci_led_control(struct led_classdev *led,
+			      enum led_brightness brightness)
+{
+	struct sdhci_host *host = container_of(led, struct sdhci_host, led);
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	if (host->runtime_suspended)
+		goto out;
+
+	if (brightness == LED_OFF)
+		__sdhci_led_deactivate(host);
+	else
+		__sdhci_led_activate(host);
+out:
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static int sdhci_led_register(struct sdhci_host *host)
+{
+	struct mmc_host *mmc = host->mmc;
+
+	if (host->quirks & SDHCI_QUIRK_NO_LED)
+		return 0;
+
+	snprintf(host->led_name, sizeof(host->led_name),
+		 "%s::", mmc_hostname(mmc));
+
+	host->led.name = host->led_name;
+	host->led.brightness = LED_OFF;
+	host->led.default_trigger = mmc_hostname(mmc);
+	host->led.brightness_set = sdhci_led_control;
+
+	return led_classdev_register(mmc_dev(mmc), &host->led);
+}
+
+static void sdhci_led_unregister(struct sdhci_host *host)
+{
+	if (host->quirks & SDHCI_QUIRK_NO_LED)
+		return;
+
+	led_classdev_unregister(&host->led);
+}
+
+static inline void sdhci_led_activate(struct sdhci_host *host)
+{
+}
+
+static inline void sdhci_led_deactivate(struct sdhci_host *host)
+{
+}
+
+#else
+
+static inline int sdhci_led_register(struct sdhci_host *host)
+{
+	return 0;
+}
+
+static inline void sdhci_led_unregister(struct sdhci_host *host)
+{
+}
+
+static inline void sdhci_led_activate(struct sdhci_host *host)
+{
+	__sdhci_led_activate(host);
+}
+
+static inline void sdhci_led_deactivate(struct sdhci_host *host)
+{
+	__sdhci_led_deactivate(host);
+}
+
+#endif
+
+static void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq,
+			    unsigned long timeout)
+{
+	if (sdhci_data_line_cmd(mrq->cmd))
+		mod_timer(&host->data_timer, timeout);
+	else
+		mod_timer(&host->timer, timeout);
+}
+
+static void sdhci_del_timer(struct sdhci_host *host, struct mmc_request *mrq)
+{
+	if (sdhci_data_line_cmd(mrq->cmd))
+		del_timer(&host->data_timer);
+	else
+		del_timer(&host->timer);
+}
+
+static inline bool sdhci_has_requests(struct sdhci_host *host)
+{
+	return host->cmd || host->data_cmd;
+}
+
+/*****************************************************************************\
+ *                                                                           *
+ * Core functions                                                            *
+ *                                                                           *
+\*****************************************************************************/
+
+static void sdhci_read_block_pio(struct sdhci_host *host)
+{
+	unsigned long flags;
+	size_t blksize, len, chunk;
+	u32 scratch;
+	u8 *buf;
+
+	DBG("PIO reading\n");
+
+	blksize = host->data->blksz;
+	chunk = 0;
+
+	local_irq_save(flags);
+
+	while (blksize) {
+		BUG_ON(!sg_miter_next(&host->sg_miter));
+
+		len = min(host->sg_miter.length, blksize);
+
+		blksize -= len;
+		host->sg_miter.consumed = len;
+
+		buf = host->sg_miter.addr;
+
+		while (len) {
+			if (chunk == 0) {
+				scratch = sdhci_readl(host, SDHCI_BUFFER);
+				chunk = 4;
+			}
+
+			*buf = scratch & 0xFF;
+
+			buf++;
+			scratch >>= 8;
+			chunk--;
+			len--;
+		}
+	}
+
+	sg_miter_stop(&host->sg_miter);
+
+	local_irq_restore(flags);
+}
+
+static void sdhci_write_block_pio(struct sdhci_host *host)
+{
+	unsigned long flags;
+	size_t blksize, len, chunk;
+	u32 scratch;
+	u8 *buf;
+
+	DBG("PIO writing\n");
+
+	blksize = host->data->blksz;
+	chunk = 0;
+	scratch = 0;
+
+	local_irq_save(flags);
+
+	while (blksize) {
+		BUG_ON(!sg_miter_next(&host->sg_miter));
+
+		len = min(host->sg_miter.length, blksize);
+
+		blksize -= len;
+		host->sg_miter.consumed = len;
+
+		buf = host->sg_miter.addr;
+
+		while (len) {
+			scratch |= (u32)*buf << (chunk * 8);
+
+			buf++;
+			chunk++;
+			len--;
+
+			if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
+				sdhci_writel(host, scratch, SDHCI_BUFFER);
+				chunk = 0;
+				scratch = 0;
+			}
+		}
+	}
+
+	sg_miter_stop(&host->sg_miter);
+
+	local_irq_restore(flags);
+}
+
+static void sdhci_transfer_pio(struct sdhci_host *host)
+{
+	u32 mask;
+
+	if (host->blocks == 0)
+		return;
+
+	if (host->data->flags & MMC_DATA_READ)
+		mask = SDHCI_DATA_AVAILABLE;
+	else
+		mask = SDHCI_SPACE_AVAILABLE;
+
+	/*
+	 * Some controllers (JMicron JMB38x) mess up the buffer bits
+	 * for transfers < 4 bytes. As long as it is just one block,
+	 * we can ignore the bits.
+	 */
+	if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
+		(host->data->blocks == 1))
+		mask = ~0;
+
+	while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
+		if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
+			udelay(100);
+
+		if (host->data->flags & MMC_DATA_READ)
+			sdhci_read_block_pio(host);
+		else
+			sdhci_write_block_pio(host);
+
+		host->blocks--;
+		if (host->blocks == 0)
+			break;
+	}
+
+	DBG("PIO transfer complete.\n");
+}
+
+static int sdhci_pre_dma_transfer(struct sdhci_host *host,
+				  struct mmc_data *data, int cookie)
+{
+	int sg_count;
+
+	/*
+	 * If the data buffers are already mapped, return the previous
+	 * dma_map_sg() result.
+	 */
+	if (data->host_cookie == COOKIE_PRE_MAPPED)
+		return data->sg_count;
+
+	/* Bounce write requests to the bounce buffer */
+	if (host->bounce_buffer) {
+		unsigned int length = data->blksz * data->blocks;
+
+		if (length > host->bounce_buffer_size) {
+			pr_err("%s: asked for transfer of %u bytes exceeds bounce buffer %u bytes\n",
+			       mmc_hostname(host->mmc), length,
+			       host->bounce_buffer_size);
+			return -EIO;
+		}
+		if (mmc_get_dma_dir(data) == DMA_TO_DEVICE) {
+			/* Copy the data to the bounce buffer */
+			if (host->ops->copy_to_bounce_buffer) {
+				host->ops->copy_to_bounce_buffer(host,
+								 data, length);
+			} else {
+				sg_copy_to_buffer(data->sg, data->sg_len,
+						  host->bounce_buffer, length);
+			}
+		}
+		/* Switch ownership to the DMA */
+		dma_sync_single_for_device(host->mmc->parent,
+					   host->bounce_addr,
+					   host->bounce_buffer_size,
+					   mmc_get_dma_dir(data));
+		/* Just a dummy value */
+		sg_count = 1;
+	} else {
+		/* Just access the data directly from memory */
+		sg_count = dma_map_sg(mmc_dev(host->mmc),
+				      data->sg, data->sg_len,
+				      mmc_get_dma_dir(data));
+	}
+
+	if (sg_count == 0)
+		return -ENOSPC;
+
+	data->sg_count = sg_count;
+	data->host_cookie = cookie;
+
+	return sg_count;
+}
+
+static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
+{
+	local_irq_save(*flags);
+	return kmap_atomic(sg_page(sg)) + sg->offset;
+}
+
+static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
+{
+	kunmap_atomic(buffer);
+	local_irq_restore(*flags);
+}
+
+void sdhci_adma_write_desc(struct sdhci_host *host, void **desc,
+			   dma_addr_t addr, int len, unsigned int cmd)
+{
+	struct sdhci_adma2_64_desc *dma_desc = *desc;
+
+	/* 32-bit and 64-bit descriptors have these members in same position */
+	dma_desc->cmd = cpu_to_le16(cmd);
+	dma_desc->len = cpu_to_le16(len);
+	dma_desc->addr_lo = cpu_to_le32(lower_32_bits(addr));
+
+	if (host->flags & SDHCI_USE_64_BIT_DMA)
+		dma_desc->addr_hi = cpu_to_le32(upper_32_bits(addr));
+
+	*desc += host->desc_sz;
+}
+EXPORT_SYMBOL_GPL(sdhci_adma_write_desc);
+
+static inline void __sdhci_adma_write_desc(struct sdhci_host *host,
+					   void **desc, dma_addr_t addr,
+					   int len, unsigned int cmd)
+{
+	if (host->ops->adma_write_desc)
+		host->ops->adma_write_desc(host, desc, addr, len, cmd);
+	else
+		sdhci_adma_write_desc(host, desc, addr, len, cmd);
+}
+
+static void sdhci_adma_mark_end(void *desc)
+{
+	struct sdhci_adma2_64_desc *dma_desc = desc;
+
+	/* 32-bit and 64-bit descriptors have 'cmd' in same position */
+	dma_desc->cmd |= cpu_to_le16(ADMA2_END);
+}
+
+static void sdhci_adma_table_pre(struct sdhci_host *host,
+	struct mmc_data *data, int sg_count)
+{
+	struct scatterlist *sg;
+	unsigned long flags;
+	dma_addr_t addr, align_addr;
+	void *desc, *align;
+	char *buffer;
+	int len, offset, i;
+
+	/*
+	 * The spec does not specify endianness of descriptor table.
+	 * We currently guess that it is LE.
+	 */
+
+	host->sg_count = sg_count;
+
+	desc = host->adma_table;
+	align = host->align_buffer;
+
+	align_addr = host->align_addr;
+
+	for_each_sg(data->sg, sg, host->sg_count, i) {
+		addr = sg_dma_address(sg);
+		len = sg_dma_len(sg);
+
+		/*
+		 * The SDHCI specification states that ADMA addresses must
+		 * be 32-bit aligned. If they aren't, then we use a bounce
+		 * buffer for the (up to three) bytes that screw up the
+		 * alignment.
+		 */
+		offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) &
+			 SDHCI_ADMA2_MASK;
+		if (offset) {
+			if (data->flags & MMC_DATA_WRITE) {
+				buffer = sdhci_kmap_atomic(sg, &flags);
+				memcpy(align, buffer, offset);
+				sdhci_kunmap_atomic(buffer, &flags);
+			}
+
+			/* tran, valid */
+			__sdhci_adma_write_desc(host, &desc, align_addr,
+						offset, ADMA2_TRAN_VALID);
+
+			BUG_ON(offset > 65536);
+
+			align += SDHCI_ADMA2_ALIGN;
+			align_addr += SDHCI_ADMA2_ALIGN;
+
+			addr += offset;
+			len -= offset;
+		}
+
+		/*
+		 * The block layer forces a minimum segment size of PAGE_SIZE,
+		 * so 'len' can be too big here if PAGE_SIZE >= 64KiB. Write
+		 * multiple descriptors, noting that the ADMA table is sized
+		 * for 4KiB chunks anyway, so it will be big enough.
+		 */
+		while (len > host->max_adma) {
+			int n = 32 * 1024; /* 32KiB*/
+
+			__sdhci_adma_write_desc(host, &desc, addr, n, ADMA2_TRAN_VALID);
+			addr += n;
+			len -= n;
+		}
+
+		/* tran, valid */
+		if (len)
+			__sdhci_adma_write_desc(host, &desc, addr, len,
+						ADMA2_TRAN_VALID);
+
+		/*
+		 * If this triggers then we have a calculation bug
+		 * somewhere. :/
+		 */
+		WARN_ON((desc - host->adma_table) >= host->adma_table_sz);
+	}
+
+	if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
+		/* Mark the last descriptor as the terminating descriptor */
+		if (desc != host->adma_table) {
+			desc -= host->desc_sz;
+			sdhci_adma_mark_end(desc);
+		}
+	} else {
+		/* Add a terminating entry - nop, end, valid */
+		__sdhci_adma_write_desc(host, &desc, 0, 0, ADMA2_NOP_END_VALID);
+	}
+}
+
+static void sdhci_adma_table_post(struct sdhci_host *host,
+	struct mmc_data *data)
+{
+	struct scatterlist *sg;
+	int i, size;
+	void *align;
+	char *buffer;
+	unsigned long flags;
+
+	if (data->flags & MMC_DATA_READ) {
+		bool has_unaligned = false;
+
+		/* Do a quick scan of the SG list for any unaligned mappings */
+		for_each_sg(data->sg, sg, host->sg_count, i)
+			if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
+				has_unaligned = true;
+				break;
+			}
+
+		if (has_unaligned) {
+			dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
+					    data->sg_len, DMA_FROM_DEVICE);
+
+			align = host->align_buffer;
+
+			for_each_sg(data->sg, sg, host->sg_count, i) {
+				if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
+					size = SDHCI_ADMA2_ALIGN -
+					       (sg_dma_address(sg) & SDHCI_ADMA2_MASK);
+
+					buffer = sdhci_kmap_atomic(sg, &flags);
+					memcpy(buffer, align, size);
+					sdhci_kunmap_atomic(buffer, &flags);
+
+					align += SDHCI_ADMA2_ALIGN;
+				}
+			}
+		}
+	}
+}
+
+static void sdhci_set_adma_addr(struct sdhci_host *host, dma_addr_t addr)
+{
+	sdhci_writel(host, lower_32_bits(addr), SDHCI_ADMA_ADDRESS);
+	if (host->flags & SDHCI_USE_64_BIT_DMA)
+		sdhci_writel(host, upper_32_bits(addr), SDHCI_ADMA_ADDRESS_HI);
+}
+
+static dma_addr_t sdhci_sdma_address(struct sdhci_host *host)
+{
+	if (host->bounce_buffer)
+		return host->bounce_addr;
+	else
+		return sg_dma_address(host->data->sg);
+}
+
+static void sdhci_set_sdma_addr(struct sdhci_host *host, dma_addr_t addr)
+{
+	if (host->v4_mode)
+		sdhci_set_adma_addr(host, addr);
+	else
+		sdhci_writel(host, addr, SDHCI_DMA_ADDRESS);
+}
+
+static unsigned int sdhci_target_timeout(struct sdhci_host *host,
+					 struct mmc_command *cmd,
+					 struct mmc_data *data)
+{
+	unsigned int target_timeout;
+
+	/* timeout in us */
+	if (!data) {
+		target_timeout = cmd->busy_timeout * 1000;
+	} else {
+		target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000);
+		if (host->clock && data->timeout_clks) {
+			unsigned long long val;
+
+			/*
+			 * data->timeout_clks is in units of clock cycles.
+			 * host->clock is in Hz.  target_timeout is in us.
+			 * Hence, us = 1000000 * cycles / Hz.  Round up.
+			 */
+			val = 1000000ULL * data->timeout_clks;
+			if (do_div(val, host->clock))
+				target_timeout++;
+			target_timeout += val;
+		}
+	}
+
+	return target_timeout;
+}
+
+static void sdhci_calc_sw_timeout(struct sdhci_host *host,
+				  struct mmc_command *cmd)
+{
+	struct mmc_data *data = cmd->data;
+	struct mmc_host *mmc = host->mmc;
+	struct mmc_ios *ios = &mmc->ios;
+	unsigned char bus_width = 1 << ios->bus_width;
+	unsigned int blksz;
+	unsigned int freq;
+	u64 target_timeout;
+	u64 transfer_time;
+
+	target_timeout = sdhci_target_timeout(host, cmd, data);
+	target_timeout *= NSEC_PER_USEC;
+
+	if (data) {
+		blksz = data->blksz;
+		freq = host->mmc->actual_clock ? : host->clock;
+		transfer_time = (u64)blksz * NSEC_PER_SEC * (8 / bus_width);
+		do_div(transfer_time, freq);
+		/* multiply by '2' to account for any unknowns */
+		transfer_time = transfer_time * 2;
+		/* calculate timeout for the entire data */
+		host->data_timeout = data->blocks * target_timeout +
+				     transfer_time;
+	} else {
+		host->data_timeout = target_timeout;
+	}
+
+	if (host->data_timeout)
+		host->data_timeout += MMC_CMD_TRANSFER_TIME;
+}
+
+static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd,
+			     bool *too_big)
+{
+	u8 count;
+	struct mmc_data *data;
+	unsigned target_timeout, current_timeout;
+
+	*too_big = true;
+
+	/*
+	 * If the host controller provides us with an incorrect timeout
+	 * value, just skip the check and use 0xE.  The hardware may take
+	 * longer to time out, but that's much better than having a too-short
+	 * timeout value.
+	 */
+	if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
+		return 0xE;
+
+	/* Unspecified command, asume max */
+	if (cmd == NULL)
+		return 0xE;
+
+	data = cmd->data;
+	/* Unspecified timeout, assume max */
+	if (!data && !cmd->busy_timeout)
+		return 0xE;
+
+	/* timeout in us */
+	target_timeout = sdhci_target_timeout(host, cmd, data);
+
+	/*
+	 * Figure out needed cycles.
+	 * We do this in steps in order to fit inside a 32 bit int.
+	 * The first step is the minimum timeout, which will have a
+	 * minimum resolution of 6 bits:
+	 * (1) 2^13*1000 > 2^22,
+	 * (2) host->timeout_clk < 2^16
+	 *     =>
+	 *     (1) / (2) > 2^6
+	 */
+	count = 0;
+	current_timeout = (1 << 13) * 1000 / host->timeout_clk;
+	while (current_timeout < target_timeout) {
+		count++;
+		current_timeout <<= 1;
+		if (count >= 0xF)
+			break;
+	}
+
+	if (count >= 0xF) {
+		if (!(host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT))
+			DBG("Too large timeout 0x%x requested for CMD%d!\n",
+			    count, cmd->opcode);
+		count = 0xE;
+	} else {
+		*too_big = false;
+	}
+
+	return count;
+}
+
+static void sdhci_set_transfer_irqs(struct sdhci_host *host)
+{
+	u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
+	u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
+
+	if (host->flags & SDHCI_REQ_USE_DMA)
+		host->ier = (host->ier & ~pio_irqs) | dma_irqs;
+	else
+		host->ier = (host->ier & ~dma_irqs) | pio_irqs;
+
+	if (host->flags & (SDHCI_AUTO_CMD23 | SDHCI_AUTO_CMD12))
+		host->ier |= SDHCI_INT_AUTO_CMD_ERR;
+	else
+		host->ier &= ~SDHCI_INT_AUTO_CMD_ERR;
+
+	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
+	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+}
+
+void sdhci_set_data_timeout_irq(struct sdhci_host *host, bool enable)
+{
+	if (enable)
+		host->ier |= SDHCI_INT_DATA_TIMEOUT;
+	else
+		host->ier &= ~SDHCI_INT_DATA_TIMEOUT;
+	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
+	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+}
+EXPORT_SYMBOL_GPL(sdhci_set_data_timeout_irq);
+
+void __sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
+{
+	bool too_big = false;
+	u8 count = sdhci_calc_timeout(host, cmd, &too_big);
+
+	if (too_big &&
+	    host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT) {
+		sdhci_calc_sw_timeout(host, cmd);
+		sdhci_set_data_timeout_irq(host, false);
+	} else if (!(host->ier & SDHCI_INT_DATA_TIMEOUT)) {
+		sdhci_set_data_timeout_irq(host, true);
+	}
+
+	sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
+}
+EXPORT_SYMBOL_GPL(__sdhci_set_timeout);
+
+static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
+{
+	if (host->ops->set_timeout)
+		host->ops->set_timeout(host, cmd);
+	else
+		__sdhci_set_timeout(host, cmd);
+}
+
+static void sdhci_initialize_data(struct sdhci_host *host,
+				  struct mmc_data *data)
+{
+	WARN_ON(host->data);
+
+	/* Sanity checks */
+	BUG_ON(data->blksz * data->blocks > 524288);
+	BUG_ON(data->blksz > host->mmc->max_blk_size);
+	BUG_ON(data->blocks > 65535);
+
+	host->data = data;
+	host->data_early = 0;
+	host->data->bytes_xfered = 0;
+}
+
+static inline void sdhci_set_block_info(struct sdhci_host *host,
+					struct mmc_data *data)
+{
+	/* Set the DMA boundary value and block size */
+	sdhci_writew(host,
+		     SDHCI_MAKE_BLKSZ(host->sdma_boundary, data->blksz),
+		     SDHCI_BLOCK_SIZE);
+	/*
+	 * For Version 4.10 onwards, if v4 mode is enabled, 32-bit Block Count
+	 * can be supported, in that case 16-bit block count register must be 0.
+	 */
+	if (host->version >= SDHCI_SPEC_410 && host->v4_mode &&
+	    (host->quirks2 & SDHCI_QUIRK2_USE_32BIT_BLK_CNT)) {
+		if (sdhci_readw(host, SDHCI_BLOCK_COUNT))
+			sdhci_writew(host, 0, SDHCI_BLOCK_COUNT);
+		sdhci_writew(host, data->blocks, SDHCI_32BIT_BLK_CNT);
+	} else {
+		sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
+	}
+}
+
+static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
+{
+	struct mmc_data *data = cmd->data;
+
+	sdhci_initialize_data(host, data);
+
+	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
+		struct scatterlist *sg;
+		unsigned int length_mask, offset_mask;
+		int i;
+
+		host->flags |= SDHCI_REQ_USE_DMA;
+
+		/*
+		 * FIXME: This doesn't account for merging when mapping the
+		 * scatterlist.
+		 *
+		 * The assumption here being that alignment and lengths are
+		 * the same after DMA mapping to device address space.
+		 */
+		length_mask = 0;
+		offset_mask = 0;
+		if (host->flags & SDHCI_USE_ADMA) {
+			if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) {
+				length_mask = 3;
+				/*
+				 * As we use up to 3 byte chunks to work
+				 * around alignment problems, we need to
+				 * check the offset as well.
+				 */
+				offset_mask = 3;
+			}
+		} else {
+			if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
+				length_mask = 3;
+			if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
+				offset_mask = 3;
+		}
+
+		if (unlikely(length_mask | offset_mask)) {
+			for_each_sg(data->sg, sg, data->sg_len, i) {
+				if (sg->length & length_mask) {
+					DBG("Reverting to PIO because of transfer size (%d)\n",
+					    sg->length);
+					host->flags &= ~SDHCI_REQ_USE_DMA;
+					break;
+				}
+				if (sg->offset & offset_mask) {
+					DBG("Reverting to PIO because of bad alignment\n");
+					host->flags &= ~SDHCI_REQ_USE_DMA;
+					break;
+				}
+			}
+		}
+	}
+
+	sdhci_config_dma(host);
+
+	if (host->flags & SDHCI_REQ_USE_DMA) {
+		int sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
+
+		if (sg_cnt <= 0) {
+			/*
+			 * This only happens when someone fed
+			 * us an invalid request.
+			 */
+			WARN_ON(1);
+			host->flags &= ~SDHCI_REQ_USE_DMA;
+		} else if (host->flags & SDHCI_USE_ADMA) {
+			sdhci_adma_table_pre(host, data, sg_cnt);
+			sdhci_set_adma_addr(host, host->adma_addr);
+		} else {
+			WARN_ON(sg_cnt != 1);
+			sdhci_set_sdma_addr(host, sdhci_sdma_address(host));
+		}
+	}
+
+	if (!(host->flags & SDHCI_REQ_USE_DMA)) {
+		int flags;
+
+		flags = SG_MITER_ATOMIC;
+		if (host->data->flags & MMC_DATA_READ)
+			flags |= SG_MITER_TO_SG;
+		else
+			flags |= SG_MITER_FROM_SG;
+		sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
+		host->blocks = data->blocks;
+	}
+
+	sdhci_set_transfer_irqs(host);
+
+	sdhci_set_block_info(host, data);
+}
+
+#if IS_ENABLED(CONFIG_MMC_SDHCI_EXTERNAL_DMA)
+
+static int sdhci_external_dma_init(struct sdhci_host *host)
+{
+	int ret = 0;
+	struct mmc_host *mmc = host->mmc;
+
+	host->tx_chan = dma_request_chan(mmc->parent, "tx");
+	if (IS_ERR(host->tx_chan)) {
+		ret = PTR_ERR(host->tx_chan);
+		if (ret != -EPROBE_DEFER)
+			pr_warn("Failed to request TX DMA channel.\n");
+		host->tx_chan = NULL;
+		return ret;
+	}
+
+	host->rx_chan = dma_request_chan(mmc->parent, "rx");
+	if (IS_ERR(host->rx_chan)) {
+		if (host->tx_chan) {
+			dma_release_channel(host->tx_chan);
+			host->tx_chan = NULL;
+		}
+
+		ret = PTR_ERR(host->rx_chan);
+		if (ret != -EPROBE_DEFER)
+			pr_warn("Failed to request RX DMA channel.\n");
+		host->rx_chan = NULL;
+	}
+
+	return ret;
+}
+
+static struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host,
+						   struct mmc_data *data)
+{
+	return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
+}
+
+static int sdhci_external_dma_setup(struct sdhci_host *host,
+				    struct mmc_command *cmd)
+{
+	int ret, i;
+	enum dma_transfer_direction dir;
+	struct dma_async_tx_descriptor *desc;
+	struct mmc_data *data = cmd->data;
+	struct dma_chan *chan;
+	struct dma_slave_config cfg;
+	dma_cookie_t cookie;
+	int sg_cnt;
+
+	if (!host->mapbase)
+		return -EINVAL;
+
+	memset(&cfg, 0, sizeof(cfg));
+	cfg.src_addr = host->mapbase + SDHCI_BUFFER;
+	cfg.dst_addr = host->mapbase + SDHCI_BUFFER;
+	cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	cfg.src_maxburst = data->blksz / 4;
+	cfg.dst_maxburst = data->blksz / 4;
+
+	/* Sanity check: all the SG entries must be aligned by block size. */
+	for (i = 0; i < data->sg_len; i++) {
+		if ((data->sg + i)->length % data->blksz)
+			return -EINVAL;
+	}
+
+	chan = sdhci_external_dma_channel(host, data);
+
+	ret = dmaengine_slave_config(chan, &cfg);
+	if (ret)
+		return ret;
+
+	sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
+	if (sg_cnt <= 0)
+		return -EINVAL;
+
+	dir = data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
+	desc = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len, dir,
+				       DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+	if (!desc)
+		return -EINVAL;
+
+	desc->callback = NULL;
+	desc->callback_param = NULL;
+
+	cookie = dmaengine_submit(desc);
+	if (dma_submit_error(cookie))
+		ret = cookie;
+
+	return ret;
+}
+
+static void sdhci_external_dma_release(struct sdhci_host *host)
+{
+	if (host->tx_chan) {
+		dma_release_channel(host->tx_chan);
+		host->tx_chan = NULL;
+	}
+
+	if (host->rx_chan) {
+		dma_release_channel(host->rx_chan);
+		host->rx_chan = NULL;
+	}
+
+	sdhci_switch_external_dma(host, false);
+}
+
+static void __sdhci_external_dma_prepare_data(struct sdhci_host *host,
+					      struct mmc_command *cmd)
+{
+	struct mmc_data *data = cmd->data;
+
+	sdhci_initialize_data(host, data);
+
+	host->flags |= SDHCI_REQ_USE_DMA;
+	sdhci_set_transfer_irqs(host);
+
+	sdhci_set_block_info(host, data);
+}
+
+static void sdhci_external_dma_prepare_data(struct sdhci_host *host,
+					    struct mmc_command *cmd)
+{
+	if (!sdhci_external_dma_setup(host, cmd)) {
+		__sdhci_external_dma_prepare_data(host, cmd);
+	} else {
+		sdhci_external_dma_release(host);
+		pr_err("%s: Cannot use external DMA, switch to the DMA/PIO which standard SDHCI provides.\n",
+		       mmc_hostname(host->mmc));
+		sdhci_prepare_data(host, cmd);
+	}
+}
+
+static void sdhci_external_dma_pre_transfer(struct sdhci_host *host,
+					    struct mmc_command *cmd)
+{
+	struct dma_chan *chan;
+
+	if (!cmd->data)
+		return;
+
+	chan = sdhci_external_dma_channel(host, cmd->data);
+	if (chan)
+		dma_async_issue_pending(chan);
+}
+
+#else
+
+static inline int sdhci_external_dma_init(struct sdhci_host *host)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void sdhci_external_dma_release(struct sdhci_host *host)
+{
+}
+
+static inline void sdhci_external_dma_prepare_data(struct sdhci_host *host,
+						   struct mmc_command *cmd)
+{
+	/* This should never happen */
+	WARN_ON_ONCE(1);
+}
+
+static inline void sdhci_external_dma_pre_transfer(struct sdhci_host *host,
+						   struct mmc_command *cmd)
+{
+}
+
+static inline struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host,
+							  struct mmc_data *data)
+{
+	return NULL;
+}
+
+#endif
+
+void sdhci_switch_external_dma(struct sdhci_host *host, bool en)
+{
+	host->use_external_dma = en;
+}
+EXPORT_SYMBOL_GPL(sdhci_switch_external_dma);
+
+static inline bool sdhci_auto_cmd12(struct sdhci_host *host,
+				    struct mmc_request *mrq)
+{
+	return !mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) &&
+	       !mrq->cap_cmd_during_tfr;
+}
+
+static inline bool sdhci_auto_cmd23(struct sdhci_host *host,
+				    struct mmc_request *mrq)
+{
+	return mrq->sbc && (host->flags & SDHCI_AUTO_CMD23);
+}
+
+static inline bool sdhci_manual_cmd23(struct sdhci_host *host,
+				      struct mmc_request *mrq)
+{
+	return mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23);
+}
+
+static inline void sdhci_auto_cmd_select(struct sdhci_host *host,
+					 struct mmc_command *cmd,
+					 u16 *mode)
+{
+	bool use_cmd12 = sdhci_auto_cmd12(host, cmd->mrq) &&
+			 (cmd->opcode != SD_IO_RW_EXTENDED);
+	bool use_cmd23 = sdhci_auto_cmd23(host, cmd->mrq);
+	u16 ctrl2;
+
+	/*
+	 * In case of Version 4.10 or later, use of 'Auto CMD Auto
+	 * Select' is recommended rather than use of 'Auto CMD12
+	 * Enable' or 'Auto CMD23 Enable'. We require Version 4 Mode
+	 * here because some controllers (e.g sdhci-of-dwmshc) expect it.
+	 */
+	if (host->version >= SDHCI_SPEC_410 && host->v4_mode &&
+	    (use_cmd12 || use_cmd23)) {
+		*mode |= SDHCI_TRNS_AUTO_SEL;
+
+		ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+		if (use_cmd23)
+			ctrl2 |= SDHCI_CMD23_ENABLE;
+		else
+			ctrl2 &= ~SDHCI_CMD23_ENABLE;
+		sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
+
+		return;
+	}
+
+	/*
+	 * If we are sending CMD23, CMD12 never gets sent
+	 * on successful completion (so no Auto-CMD12).
+	 */
+	if (use_cmd12)
+		*mode |= SDHCI_TRNS_AUTO_CMD12;
+	else if (use_cmd23)
+		*mode |= SDHCI_TRNS_AUTO_CMD23;
+}
+
+static void sdhci_set_transfer_mode(struct sdhci_host *host,
+	struct mmc_command *cmd)
+{
+	u16 mode = 0;
+	struct mmc_data *data = cmd->data;
+
+	if (data == NULL) {
+		if (host->quirks2 &
+			SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
+			/* must not clear SDHCI_TRANSFER_MODE when tuning */
+			if (cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
+				sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
+		} else {
+		/* clear Auto CMD settings for no data CMDs */
+			mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
+			sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
+				SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
+		}
+		return;
+	}
+
+	WARN_ON(!host->data);
+
+	if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
+		mode = SDHCI_TRNS_BLK_CNT_EN;
+
+	if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
+		mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
+		sdhci_auto_cmd_select(host, cmd, &mode);
+		if (sdhci_auto_cmd23(host, cmd->mrq))
+			sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);
+	}
+
+	if (data->flags & MMC_DATA_READ)
+		mode |= SDHCI_TRNS_READ;
+	if (host->flags & SDHCI_REQ_USE_DMA)
+		mode |= SDHCI_TRNS_DMA;
+
+	sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
+}
+
+static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq)
+{
+	return (!(host->flags & SDHCI_DEVICE_DEAD) &&
+		((mrq->cmd && mrq->cmd->error) ||
+		 (mrq->sbc && mrq->sbc->error) ||
+		 (mrq->data && mrq->data->stop && mrq->data->stop->error) ||
+		 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST)));
+}
+
+static void sdhci_set_mrq_done(struct sdhci_host *host, struct mmc_request *mrq)
+{
+	int i;
+
+	for (i = 0; i < SDHCI_MAX_MRQS; i++) {
+		if (host->mrqs_done[i] == mrq) {
+			WARN_ON(1);
+			return;
+		}
+	}
+
+	for (i = 0; i < SDHCI_MAX_MRQS; i++) {
+		if (!host->mrqs_done[i]) {
+			host->mrqs_done[i] = mrq;
+			break;
+		}
+	}
+
+	WARN_ON(i >= SDHCI_MAX_MRQS);
+}
+
+static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
+{
+	if (host->cmd && host->cmd->mrq == mrq)
+		host->cmd = NULL;
+
+	if (host->data_cmd && host->data_cmd->mrq == mrq)
+		host->data_cmd = NULL;
+
+	if (host->deferred_cmd && host->deferred_cmd->mrq == mrq)
+		host->deferred_cmd = NULL;
+
+	if (host->data && host->data->mrq == mrq)
+		host->data = NULL;
+
+	if (sdhci_needs_reset(host, mrq))
+		host->pending_reset = true;
+
+	sdhci_set_mrq_done(host, mrq);
+
+	sdhci_del_timer(host, mrq);
+
+	if (!sdhci_has_requests(host))
+		sdhci_led_deactivate(host);
+}
+
+static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
+{
+	__sdhci_finish_mrq(host, mrq);
+
+	queue_work(host->complete_wq, &host->complete_work);
+}
+
+static void __sdhci_finish_data(struct sdhci_host *host, bool sw_data_timeout)
+{
+	struct mmc_command *data_cmd = host->data_cmd;
+	struct mmc_data *data = host->data;
+
+	host->data = NULL;
+	host->data_cmd = NULL;
+
+	/*
+	 * The controller needs a reset of internal state machines upon error
+	 * conditions.
+	 */
+	if (data->error) {
+		if (!host->cmd || host->cmd == data_cmd)
+			sdhci_do_reset(host, SDHCI_RESET_CMD);
+		sdhci_do_reset(host, SDHCI_RESET_DATA);
+	}
+
+	if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) ==
+	    (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA))
+		sdhci_adma_table_post(host, data);
+
+	/*
+	 * The specification states that the block count register must
+	 * be updated, but it does not specify at what point in the
+	 * data flow. That makes the register entirely useless to read
+	 * back so we have to assume that nothing made it to the card
+	 * in the event of an error.
+	 */
+	if (data->error)
+		data->bytes_xfered = 0;
+	else
+		data->bytes_xfered = data->blksz * data->blocks;
+
+	/*
+	 * Need to send CMD12 if -
+	 * a) open-ended multiblock transfer not using auto CMD12 (no CMD23)
+	 * b) error in multiblock transfer
+	 */
+	if (data->stop &&
+	    ((!data->mrq->sbc && !sdhci_auto_cmd12(host, data->mrq)) ||
+	     data->error)) {
+		/*
+		 * 'cap_cmd_during_tfr' request must not use the command line
+		 * after mmc_command_done() has been called. It is upper layer's
+		 * responsibility to send the stop command if required.
+		 */
+		if (data->mrq->cap_cmd_during_tfr) {
+			__sdhci_finish_mrq(host, data->mrq);
+		} else {
+			/* Avoid triggering warning in sdhci_send_command() */
+			host->cmd = NULL;
+			if (!sdhci_send_command(host, data->stop)) {
+				if (sw_data_timeout) {
+					/*
+					 * This is anyway a sw data timeout, so
+					 * give up now.
+					 */
+					data->stop->error = -EIO;
+					__sdhci_finish_mrq(host, data->mrq);
+				} else {
+					WARN_ON(host->deferred_cmd);
+					host->deferred_cmd = data->stop;
+				}
+			}
+		}
+	} else {
+		__sdhci_finish_mrq(host, data->mrq);
+	}
+}
+
+static void sdhci_finish_data(struct sdhci_host *host)
+{
+	__sdhci_finish_data(host, false);
+}
+
+static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
+{
+	int flags;
+	u32 mask;
+	unsigned long timeout;
+
+	WARN_ON(host->cmd);
+
+	/* Initially, a command has no error */
+	cmd->error = 0;
+
+	if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
+	    cmd->opcode == MMC_STOP_TRANSMISSION)
+		cmd->flags |= MMC_RSP_BUSY;
+
+	mask = SDHCI_CMD_INHIBIT;
+	if (sdhci_data_line_cmd(cmd))
+		mask |= SDHCI_DATA_INHIBIT;
+
+	/* We shouldn't wait for data inihibit for stop commands, even
+	   though they might use busy signaling */
+	if (cmd->mrq->data && (cmd == cmd->mrq->data->stop))
+		mask &= ~SDHCI_DATA_INHIBIT;
+
+	if (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask)
+		return false;
+
+	host->cmd = cmd;
+	host->data_timeout = 0;
+	if (sdhci_data_line_cmd(cmd)) {
+		WARN_ON(host->data_cmd);
+		host->data_cmd = cmd;
+		sdhci_set_timeout(host, cmd);
+	}
+
+	if (cmd->data) {
+		if (host->use_external_dma)
+			sdhci_external_dma_prepare_data(host, cmd);
+		else
+			sdhci_prepare_data(host, cmd);
+	}
+
+	sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
+
+	sdhci_set_transfer_mode(host, cmd);
+
+	if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
+		WARN_ONCE(1, "Unsupported response type!\n");
+		/*
+		 * This does not happen in practice because 136-bit response
+		 * commands never have busy waiting, so rather than complicate
+		 * the error path, just remove busy waiting and continue.
+		 */
+		cmd->flags &= ~MMC_RSP_BUSY;
+	}
+
+	if (!(cmd->flags & MMC_RSP_PRESENT))
+		flags = SDHCI_CMD_RESP_NONE;
+	else if (cmd->flags & MMC_RSP_136)
+		flags = SDHCI_CMD_RESP_LONG;
+	else if (cmd->flags & MMC_RSP_BUSY)
+		flags = SDHCI_CMD_RESP_SHORT_BUSY;
+	else
+		flags = SDHCI_CMD_RESP_SHORT;
+
+	if (cmd->flags & MMC_RSP_CRC)
+		flags |= SDHCI_CMD_CRC;
+	if (cmd->flags & MMC_RSP_OPCODE)
+		flags |= SDHCI_CMD_INDEX;
+
+	/* CMD19 is special in that the Data Present Select should be set */
+	if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
+	    cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
+		flags |= SDHCI_CMD_DATA;
+
+	timeout = jiffies;
+	if (host->data_timeout)
+		timeout += nsecs_to_jiffies(host->data_timeout);
+	else if (!cmd->data && cmd->busy_timeout > 9000)
+		timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
+	else
+		timeout += 10 * HZ;
+	sdhci_mod_timer(host, cmd->mrq, timeout);
+
+	if (host->use_external_dma)
+		sdhci_external_dma_pre_transfer(host, cmd);
+
+	sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
+
+	return true;
+}
+
+static bool sdhci_present_error(struct sdhci_host *host,
+				struct mmc_command *cmd, bool present)
+{
+	if (!present || host->flags & SDHCI_DEVICE_DEAD) {
+		cmd->error = -ENOMEDIUM;
+		return true;
+	}
+
+	return false;
+}
+
+static bool sdhci_send_command_retry(struct sdhci_host *host,
+				     struct mmc_command *cmd,
+				     unsigned long flags)
+	__releases(host->lock)
+	__acquires(host->lock)
+{
+	struct mmc_command *deferred_cmd = host->deferred_cmd;
+	int timeout = 10; /* Approx. 10 ms */
+	bool present;
+
+	while (!sdhci_send_command(host, cmd)) {
+		if (!timeout--) {
+			pr_err("%s: Controller never released inhibit bit(s).\n",
+			       mmc_hostname(host->mmc));
+			sdhci_dumpregs(host);
+			cmd->error = -EIO;
+			return false;
+		}
+
+		spin_unlock_irqrestore(&host->lock, flags);
+
+		usleep_range(1000, 1250);
+
+		present = host->mmc->ops->get_cd(host->mmc);
+
+		spin_lock_irqsave(&host->lock, flags);
+
+		/* A deferred command might disappear, handle that */
+		if (cmd == deferred_cmd && cmd != host->deferred_cmd)
+			return true;
+
+		if (sdhci_present_error(host, cmd, present))
+			return false;
+	}
+
+	if (cmd == host->deferred_cmd)
+		host->deferred_cmd = NULL;
+
+	return true;
+}
+
+static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd)
+{
+	int i, reg;
+
+	for (i = 0; i < 4; i++) {
+		reg = SDHCI_RESPONSE + (3 - i) * 4;
+		cmd->resp[i] = sdhci_readl(host, reg);
+	}
+
+	if (host->quirks2 & SDHCI_QUIRK2_RSP_136_HAS_CRC)
+		return;
+
+	/* CRC is stripped so we need to do some shifting */
+	for (i = 0; i < 4; i++) {
+		cmd->resp[i] <<= 8;
+		if (i != 3)
+			cmd->resp[i] |= cmd->resp[i + 1] >> 24;
+	}
+}
+
+static void sdhci_finish_command(struct sdhci_host *host)
+{
+	struct mmc_command *cmd = host->cmd;
+
+	host->cmd = NULL;
+
+	if (cmd->flags & MMC_RSP_PRESENT) {
+		if (cmd->flags & MMC_RSP_136) {
+			sdhci_read_rsp_136(host, cmd);
+		} else {
+			cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
+		}
+	}
+
+	if (cmd->mrq->cap_cmd_during_tfr && cmd == cmd->mrq->cmd)
+		mmc_command_done(host->mmc, cmd->mrq);
+
+	/*
+	 * The host can send and interrupt when the busy state has
+	 * ended, allowing us to wait without wasting CPU cycles.
+	 * The busy signal uses DAT0 so this is similar to waiting
+	 * for data to complete.
+	 *
+	 * Note: The 1.0 specification is a bit ambiguous about this
+	 *       feature so there might be some problems with older
+	 *       controllers.
+	 */
+	if (cmd->flags & MMC_RSP_BUSY) {
+		if (cmd->data) {
+			DBG("Cannot wait for busy signal when also doing a data transfer");
+		} else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ) &&
+			   cmd == host->data_cmd) {
+			/* Command complete before busy is ended */
+			return;
+		}
+	}
+
+	/* Finished CMD23, now send actual command. */
+	if (cmd == cmd->mrq->sbc) {
+		if (!sdhci_send_command(host, cmd->mrq->cmd)) {
+			WARN_ON(host->deferred_cmd);
+			host->deferred_cmd = cmd->mrq->cmd;
+		}
+	} else {
+
+		/* Processed actual command. */
+		if (host->data && host->data_early)
+			sdhci_finish_data(host);
+
+		if (!cmd->data)
+			__sdhci_finish_mrq(host, cmd->mrq);
+	}
+}
+
+static u16 sdhci_get_preset_value(struct sdhci_host *host)
+{
+	u16 preset = 0;
+
+	switch (host->timing) {
+	case MMC_TIMING_MMC_HS:
+	case MMC_TIMING_SD_HS:
+		preset = sdhci_readw(host, SDHCI_PRESET_FOR_HIGH_SPEED);
+		break;
+	case MMC_TIMING_UHS_SDR12:
+		preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
+		break;
+	case MMC_TIMING_UHS_SDR25:
+		preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
+		break;
+	case MMC_TIMING_UHS_SDR50:
+		preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
+		break;
+	case MMC_TIMING_UHS_SDR104:
+	case MMC_TIMING_MMC_HS200:
+		preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
+		break;
+	case MMC_TIMING_UHS_DDR50:
+	case MMC_TIMING_MMC_DDR52:
+		preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
+		break;
+	case MMC_TIMING_MMC_HS400:
+		preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
+		break;
+	default:
+		pr_warn("%s: Invalid UHS-I mode selected\n",
+			mmc_hostname(host->mmc));
+		preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
+		break;
+	}
+	return preset;
+}
+
+u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
+		   unsigned int *actual_clock)
+{
+	int div = 0; /* Initialized for compiler warning */
+	int real_div = div, clk_mul = 1;
+	u16 clk = 0;
+	bool switch_base_clk = false;
+
+	if (host->version >= SDHCI_SPEC_300) {
+		if (host->preset_enabled) {
+			u16 pre_val;
+
+			clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+			pre_val = sdhci_get_preset_value(host);
+			div = FIELD_GET(SDHCI_PRESET_SDCLK_FREQ_MASK, pre_val);
+			if (host->clk_mul &&
+				(pre_val & SDHCI_PRESET_CLKGEN_SEL)) {
+				clk = SDHCI_PROG_CLOCK_MODE;
+				real_div = div + 1;
+				clk_mul = host->clk_mul;
+			} else {
+				real_div = max_t(int, 1, div << 1);
+			}
+			goto clock_set;
+		}
+
+		/*
+		 * Check if the Host Controller supports Programmable Clock
+		 * Mode.
+		 */
+		if (host->clk_mul) {
+			for (div = 1; div <= 1024; div++) {
+				if ((host->max_clk * host->clk_mul / div)
+					<= clock)
+					break;
+			}
+			if ((host->max_clk * host->clk_mul / div) <= clock) {
+				/*
+				 * Set Programmable Clock Mode in the Clock
+				 * Control register.
+				 */
+				clk = SDHCI_PROG_CLOCK_MODE;
+				real_div = div;
+				clk_mul = host->clk_mul;
+				div--;
+			} else {
+				/*
+				 * Divisor can be too small to reach clock
+				 * speed requirement. Then use the base clock.
+				 */
+				switch_base_clk = true;
+			}
+		}
+
+		if (!host->clk_mul || switch_base_clk) {
+			/* Version 3.00 divisors must be a multiple of 2. */
+			if (host->max_clk <= clock)
+				div = 1;
+			else {
+				for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
+				     div += 2) {
+					if ((host->max_clk / div) <= clock)
+						break;
+				}
+			}
+			real_div = div;
+			div >>= 1;
+			if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
+				&& !div && host->max_clk <= 25000000)
+				div = 1;
+		}
+	} else {
+		/* Version 2.00 divisors must be a power of 2. */
+		for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
+			if ((host->max_clk / div) <= clock)
+				break;
+		}
+		real_div = div;
+		div >>= 1;
+	}
+
+clock_set:
+	if (real_div)
+		*actual_clock = (host->max_clk * clk_mul) / real_div;
+	clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
+	clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
+		<< SDHCI_DIVIDER_HI_SHIFT;
+
+	return clk;
+}
+EXPORT_SYMBOL_GPL(sdhci_calc_clk);
+
+void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
+{
+	ktime_t timeout;
+
+	clk |= SDHCI_CLOCK_INT_EN;
+	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+	/* Wait max 150 ms */
+	timeout = ktime_add_ms(ktime_get(), 150);
+	while (1) {
+		bool timedout = ktime_after(ktime_get(), timeout);
+
+		clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+		if (clk & SDHCI_CLOCK_INT_STABLE)
+			break;
+		if (timedout) {
+			pr_err("%s: Internal clock never stabilised.\n",
+			       mmc_hostname(host->mmc));
+			sdhci_dumpregs(host);
+			return;
+		}
+		udelay(10);
+	}
+
+	if (host->version >= SDHCI_SPEC_410 && host->v4_mode) {
+		clk |= SDHCI_CLOCK_PLL_EN;
+		clk &= ~SDHCI_CLOCK_INT_STABLE;
+		sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+		/* Wait max 150 ms */
+		timeout = ktime_add_ms(ktime_get(), 150);
+		while (1) {
+			bool timedout = ktime_after(ktime_get(), timeout);
+
+			clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+			if (clk & SDHCI_CLOCK_INT_STABLE)
+				break;
+			if (timedout) {
+				pr_err("%s: PLL clock never stabilised.\n",
+				       mmc_hostname(host->mmc));
+				sdhci_dumpregs(host);
+				return;
+			}
+			udelay(10);
+		}
+	}
+
+	clk |= SDHCI_CLOCK_CARD_EN;
+	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+}
+EXPORT_SYMBOL_GPL(sdhci_enable_clk);
+
+void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
+{
+	u16 clk;
+
+	host->mmc->actual_clock = 0;
+
+	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
+
+	if (clock == 0)
+		return;
+
+	clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
+	sdhci_enable_clk(host, clk);
+}
+EXPORT_SYMBOL_GPL(sdhci_set_clock);
+
+static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
+				unsigned short vdd)
+{
+	struct mmc_host *mmc = host->mmc;
+
+	mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
+
+	if (mode != MMC_POWER_OFF)
+		sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
+	else
+		sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
+}
+
+void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
+			   unsigned short vdd)
+{
+	u8 pwr = 0;
+
+	if (mode != MMC_POWER_OFF) {
+		switch (1 << vdd) {
+		case MMC_VDD_165_195:
+		/*
+		 * Without a regulator, SDHCI does not support 2.0v
+		 * so we only get here if the driver deliberately
+		 * added the 2.0v range to ocr_avail. Map it to 1.8v
+		 * for the purpose of turning on the power.
+		 */
+		case MMC_VDD_20_21:
+			pwr = SDHCI_POWER_180;
+			break;
+		case MMC_VDD_29_30:
+		case MMC_VDD_30_31:
+			pwr = SDHCI_POWER_300;
+			break;
+		case MMC_VDD_32_33:
+		case MMC_VDD_33_34:
+		/*
+		 * 3.4 ~ 3.6V are valid only for those platforms where it's
+		 * known that the voltage range is supported by hardware.
+		 */
+		case MMC_VDD_34_35:
+		case MMC_VDD_35_36:
+			pwr = SDHCI_POWER_330;
+			break;
+		default:
+			WARN(1, "%s: Invalid vdd %#x\n",
+			     mmc_hostname(host->mmc), vdd);
+			break;
+		}
+	}
+
+	if (host->pwr == pwr)
+		return;
+
+	host->pwr = pwr;
+
+	if (pwr == 0) {
+		sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
+		if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
+			sdhci_runtime_pm_bus_off(host);
+	} else {
+		/*
+		 * Spec says that we should clear the power reg before setting
+		 * a new value. Some controllers don't seem to like this though.
+		 */
+		if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
+			sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
+
+		/*
+		 * At least the Marvell CaFe chip gets confused if we set the
+		 * voltage and set turn on power at the same time, so set the
+		 * voltage first.
+		 */
+		if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
+			sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
+
+		pwr |= SDHCI_POWER_ON;
+
+		sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
+
+		if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
+			sdhci_runtime_pm_bus_on(host);
+
+		/*
+		 * Some controllers need an extra 10ms delay of 10ms before
+		 * they can apply clock after applying power
+		 */
+		if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
+			mdelay(10);
+	}
+}
+EXPORT_SYMBOL_GPL(sdhci_set_power_noreg);
+
+void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
+		     unsigned short vdd)
+{
+	if (IS_ERR(host->mmc->supply.vmmc))
+		sdhci_set_power_noreg(host, mode, vdd);
+	else
+		sdhci_set_power_reg(host, mode, vdd);
+}
+EXPORT_SYMBOL_GPL(sdhci_set_power);
+
+/*
+ * Some controllers need to configure a valid bus voltage on their power
+ * register regardless of whether an external regulator is taking care of power
+ * supply. This helper function takes care of it if set as the controller's
+ * sdhci_ops.set_power callback.
+ */
+void sdhci_set_power_and_bus_voltage(struct sdhci_host *host,
+				     unsigned char mode,
+				     unsigned short vdd)
+{
+	if (!IS_ERR(host->mmc->supply.vmmc)) {
+		struct mmc_host *mmc = host->mmc;
+
+		mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
+	}
+	sdhci_set_power_noreg(host, mode, vdd);
+}
+EXPORT_SYMBOL_GPL(sdhci_set_power_and_bus_voltage);
+
+/*****************************************************************************\
+ *                                                                           *
+ * MMC callbacks                                                             *
+ *                                                                           *
+\*****************************************************************************/
+
+void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	struct mmc_command *cmd;
+	unsigned long flags;
+	bool present;
+
+	/* Firstly check card presence */
+	present = mmc->ops->get_cd(mmc);
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	sdhci_led_activate(host);
+
+	if (sdhci_present_error(host, mrq->cmd, present))
+		goto out_finish;
+
+	cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd;
+
+	if (!sdhci_send_command_retry(host, cmd, flags))
+		goto out_finish;
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	return;
+
+out_finish:
+	sdhci_finish_mrq(host, mrq);
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+EXPORT_SYMBOL_GPL(sdhci_request);
+
+int sdhci_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	struct mmc_command *cmd;
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	if (sdhci_present_error(host, mrq->cmd, true)) {
+		sdhci_finish_mrq(host, mrq);
+		goto out_finish;
+	}
+
+	cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd;
+
+	/*
+	 * The HSQ may send a command in interrupt context without polling
+	 * the busy signaling, which means we should return BUSY if controller
+	 * has not released inhibit bits to allow HSQ trying to send request
+	 * again in non-atomic context. So we should not finish this request
+	 * here.
+	 */
+	if (!sdhci_send_command(host, cmd))
+		ret = -EBUSY;
+	else
+		sdhci_led_activate(host);
+
+out_finish:
+	spin_unlock_irqrestore(&host->lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sdhci_request_atomic);
+
+void sdhci_set_bus_width(struct sdhci_host *host, int width)
+{
+	u8 ctrl;
+
+	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
+	if (width == MMC_BUS_WIDTH_8) {
+		ctrl &= ~SDHCI_CTRL_4BITBUS;
+		ctrl |= SDHCI_CTRL_8BITBUS;
+	} else {
+		if (host->mmc->caps & MMC_CAP_8_BIT_DATA)
+			ctrl &= ~SDHCI_CTRL_8BITBUS;
+		if (width == MMC_BUS_WIDTH_4)
+			ctrl |= SDHCI_CTRL_4BITBUS;
+		else
+			ctrl &= ~SDHCI_CTRL_4BITBUS;
+	}
+	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+}
+EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
+
+void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
+{
+	u16 ctrl_2;
+
+	ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+	/* Select Bus Speed Mode for host */
+	ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
+	if ((timing == MMC_TIMING_MMC_HS200) ||
+	    (timing == MMC_TIMING_UHS_SDR104))
+		ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
+	else if (timing == MMC_TIMING_UHS_SDR12)
+		ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
+	else if (timing == MMC_TIMING_UHS_SDR25)
+		ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
+	else if (timing == MMC_TIMING_UHS_SDR50)
+		ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
+	else if ((timing == MMC_TIMING_UHS_DDR50) ||
+		 (timing == MMC_TIMING_MMC_DDR52))
+		ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
+	else if (timing == MMC_TIMING_MMC_HS400)
+		ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
+	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
+}
+EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
+
+static bool sdhci_timing_has_preset(unsigned char timing)
+{
+	switch (timing) {
+	case MMC_TIMING_UHS_SDR12:
+	case MMC_TIMING_UHS_SDR25:
+	case MMC_TIMING_UHS_SDR50:
+	case MMC_TIMING_UHS_SDR104:
+	case MMC_TIMING_UHS_DDR50:
+	case MMC_TIMING_MMC_DDR52:
+		return true;
+	};
+	return false;
+}
+
+static bool sdhci_preset_needed(struct sdhci_host *host, unsigned char timing)
+{
+	return !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
+	       sdhci_timing_has_preset(timing);
+}
+
+static bool sdhci_presetable_values_change(struct sdhci_host *host, struct mmc_ios *ios)
+{
+	/*
+	 * Preset Values are: Driver Strength, Clock Generator and SDCLK/RCLK
+	 * Frequency. Check if preset values need to be enabled, or the Driver
+	 * Strength needs updating. Note, clock changes are handled separately.
+	 */
+	return !host->preset_enabled &&
+	       (sdhci_preset_needed(host, ios->timing) || host->drv_type != ios->drv_type);
+}
+
+void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	bool reinit_uhs = host->reinit_uhs;
+	bool turning_on_clk = false;
+	u8 ctrl;
+
+	host->reinit_uhs = false;
+
+	if (ios->power_mode == MMC_POWER_UNDEFINED)
+		return;
+
+	if (host->flags & SDHCI_DEVICE_DEAD) {
+		if (!IS_ERR(mmc->supply.vmmc) &&
+		    ios->power_mode == MMC_POWER_OFF)
+			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
+		return;
+	}
+
+	/*
+	 * Reset the chip on each power off.
+	 * Should clear out any weird states.
+	 */
+	if (ios->power_mode == MMC_POWER_OFF) {
+		sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
+		sdhci_reinit(host);
+	}
+
+	if (host->version >= SDHCI_SPEC_300 &&
+		(ios->power_mode == MMC_POWER_UP) &&
+		!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
+		sdhci_enable_preset_value(host, false);
+
+	if (!ios->clock || ios->clock != host->clock) {
+		turning_on_clk = ios->clock && !host->clock;
+
+		host->ops->set_clock(host, ios->clock);
+		host->clock = ios->clock;
+
+		if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
+		    host->clock) {
+			host->timeout_clk = host->mmc->actual_clock ?
+						host->mmc->actual_clock / 1000 :
+						host->clock / 1000;
+			host->mmc->max_busy_timeout =
+				host->ops->get_max_timeout_count ?
+				host->ops->get_max_timeout_count(host) :
+				1 << 27;
+			host->mmc->max_busy_timeout /= host->timeout_clk;
+		}
+	}
+
+	if (host->ops->set_power)
+		host->ops->set_power(host, ios->power_mode, ios->vdd);
+	else
+		sdhci_set_power(host, ios->power_mode, ios->vdd);
+
+	if (host->ops->platform_send_init_74_clocks)
+		host->ops->platform_send_init_74_clocks(host, ios->power_mode);
+
+	host->ops->set_bus_width(host, ios->bus_width);
+
+	/*
+	 * Special case to avoid multiple clock changes during voltage
+	 * switching.
+	 */
+	if (!reinit_uhs &&
+	    turning_on_clk &&
+	    host->timing == ios->timing &&
+	    host->version >= SDHCI_SPEC_300 &&
+	    !sdhci_presetable_values_change(host, ios))
+		return;
+
+	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
+
+	if (!(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)) {
+		if (ios->timing == MMC_TIMING_SD_HS ||
+		     ios->timing == MMC_TIMING_MMC_HS ||
+		     ios->timing == MMC_TIMING_MMC_HS400 ||
+		     ios->timing == MMC_TIMING_MMC_HS200 ||
+		     ios->timing == MMC_TIMING_MMC_DDR52 ||
+		     ios->timing == MMC_TIMING_UHS_SDR50 ||
+		     ios->timing == MMC_TIMING_UHS_SDR104 ||
+		     ios->timing == MMC_TIMING_UHS_DDR50 ||
+		     ios->timing == MMC_TIMING_UHS_SDR25)
+			ctrl |= SDHCI_CTRL_HISPD;
+		else
+			ctrl &= ~SDHCI_CTRL_HISPD;
+	}
+
+	if (host->version >= SDHCI_SPEC_300) {
+		u16 clk, ctrl_2;
+
+		if (!host->preset_enabled) {
+			sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+			/*
+			 * We only need to set Driver Strength if the
+			 * preset value enable is not set.
+			 */
+			ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+			ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
+			if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
+				ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
+			else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B)
+				ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
+			else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
+				ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
+			else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D)
+				ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D;
+			else {
+				pr_warn("%s: invalid driver type, default to driver type B\n",
+					mmc_hostname(mmc));
+				ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
+			}
+
+			sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
+			host->drv_type = ios->drv_type;
+		} else {
+			/*
+			 * According to SDHC Spec v3.00, if the Preset Value
+			 * Enable in the Host Control 2 register is set, we
+			 * need to reset SD Clock Enable before changing High
+			 * Speed Enable to avoid generating clock gliches.
+			 */
+
+			/* Reset SD Clock Enable */
+			clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+			clk &= ~SDHCI_CLOCK_CARD_EN;
+			sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+			sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+
+			/* Re-enable SD Clock */
+			host->ops->set_clock(host, host->clock);
+		}
+
+		/* Reset SD Clock Enable */
+		clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+		clk &= ~SDHCI_CLOCK_CARD_EN;
+		sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+		host->ops->set_uhs_signaling(host, ios->timing);
+		host->timing = ios->timing;
+
+		if (sdhci_preset_needed(host, ios->timing)) {
+			u16 preset;
+
+			sdhci_enable_preset_value(host, true);
+			preset = sdhci_get_preset_value(host);
+			ios->drv_type = FIELD_GET(SDHCI_PRESET_DRV_MASK,
+						  preset);
+			host->drv_type = ios->drv_type;
+		}
+
+		/* Re-enable SD Clock */
+		host->ops->set_clock(host, host->clock);
+	} else
+		sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+
+	/*
+	 * Some (ENE) controllers go apeshit on some ios operation,
+	 * signalling timeout and CRC errors even on CMD0. Resetting
+	 * it on each ios seems to solve the problem.
+	 */
+	if (host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
+		sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
+}
+EXPORT_SYMBOL_GPL(sdhci_set_ios);
+
+static int sdhci_get_cd(struct mmc_host *mmc)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	int gpio_cd = mmc_gpio_get_cd(mmc);
+
+	if (host->flags & SDHCI_DEVICE_DEAD)
+		return 0;
+
+	/* If nonremovable, assume that the card is always present. */
+	if (!mmc_card_is_removable(host->mmc))
+		return 1;
+
+	/*
+	 * Try slot gpio detect, if defined it take precedence
+	 * over build in controller functionality
+	 */
+	if (gpio_cd >= 0)
+		return !!gpio_cd;
+
+	/* If polling, assume that the card is always present. */
+	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
+		return 1;
+
+	/* Host native card detect */
+	return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
+}
+
+static int sdhci_check_ro(struct sdhci_host *host)
+{
+	unsigned long flags;
+	int is_readonly;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	if (host->flags & SDHCI_DEVICE_DEAD)
+		is_readonly = 0;
+	else if (host->ops->get_ro)
+		is_readonly = host->ops->get_ro(host);
+	else if (mmc_can_gpio_ro(host->mmc))
+		is_readonly = mmc_gpio_get_ro(host->mmc);
+	else
+		is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
+				& SDHCI_WRITE_PROTECT);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	/* This quirk needs to be replaced by a callback-function later */
+	return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
+		!is_readonly : is_readonly;
+}
+
+#define SAMPLE_COUNT	5
+
+static int sdhci_get_ro(struct mmc_host *mmc)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	int i, ro_count;
+
+	if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
+		return sdhci_check_ro(host);
+
+	ro_count = 0;
+	for (i = 0; i < SAMPLE_COUNT; i++) {
+		if (sdhci_check_ro(host)) {
+			if (++ro_count > SAMPLE_COUNT / 2)
+				return 1;
+		}
+		msleep(30);
+	}
+	return 0;
+}
+
+static void sdhci_hw_reset(struct mmc_host *mmc)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+
+	if (host->ops && host->ops->hw_reset)
+		host->ops->hw_reset(host);
+}
+
+static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
+{
+	if (!(host->flags & SDHCI_DEVICE_DEAD)) {
+		if (enable)
+			host->ier |= SDHCI_INT_CARD_INT;
+		else
+			host->ier &= ~SDHCI_INT_CARD_INT;
+
+		sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
+		sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+	}
+}
+
+void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+
+	if (enable)
+		pm_runtime_get_noresume(host->mmc->parent);
+
+	spin_lock_irqsave(&host->lock, flags);
+	sdhci_enable_sdio_irq_nolock(host, enable);
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	if (!enable)
+		pm_runtime_put_noidle(host->mmc->parent);
+}
+EXPORT_SYMBOL_GPL(sdhci_enable_sdio_irq);
+
+static void sdhci_ack_sdio_irq(struct mmc_host *mmc)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+	sdhci_enable_sdio_irq_nolock(host, true);
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
+				      struct mmc_ios *ios)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	u16 ctrl;
+	int ret;
+
+	/*
+	 * Signal Voltage Switching is only applicable for Host Controllers
+	 * v3.00 and above.
+	 */
+	if (host->version < SDHCI_SPEC_300)
+		return 0;
+
+	ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+
+	switch (ios->signal_voltage) {
+	case MMC_SIGNAL_VOLTAGE_330:
+		if (!(host->flags & SDHCI_SIGNALING_330))
+			return -EINVAL;
+		/* Set 1.8V Signal Enable in the Host Control2 register to 0 */
+		ctrl &= ~SDHCI_CTRL_VDD_180;
+		sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+		if (!IS_ERR(mmc->supply.vqmmc)) {
+			ret = mmc_regulator_set_vqmmc(mmc, ios);
+			if (ret < 0) {
+				pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
+					mmc_hostname(mmc));
+				return -EIO;
+			}
+		}
+		/* Wait for 5ms */
+		usleep_range(5000, 5500);
+
+		/* 3.3V regulator output should be stable within 5 ms */
+		ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+		if (!(ctrl & SDHCI_CTRL_VDD_180))
+			return 0;
+
+		pr_warn("%s: 3.3V regulator output did not become stable\n",
+			mmc_hostname(mmc));
+
+		return -EAGAIN;
+	case MMC_SIGNAL_VOLTAGE_180:
+		if (!(host->flags & SDHCI_SIGNALING_180))
+			return -EINVAL;
+		if (!IS_ERR(mmc->supply.vqmmc)) {
+			ret = mmc_regulator_set_vqmmc(mmc, ios);
+			if (ret < 0) {
+				pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
+					mmc_hostname(mmc));
+				return -EIO;
+			}
+		}
+
+		/*
+		 * Enable 1.8V Signal Enable in the Host Control2
+		 * register
+		 */
+		ctrl |= SDHCI_CTRL_VDD_180;
+		sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+		/* Some controller need to do more when switching */
+		if (host->ops->voltage_switch)
+			host->ops->voltage_switch(host);
+
+		/* 1.8V regulator output should be stable within 5 ms */
+		ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+		if (ctrl & SDHCI_CTRL_VDD_180)
+			return 0;
+
+		pr_warn("%s: 1.8V regulator output did not become stable\n",
+			mmc_hostname(mmc));
+
+		return -EAGAIN;
+	case MMC_SIGNAL_VOLTAGE_120:
+		if (!(host->flags & SDHCI_SIGNALING_120))
+			return -EINVAL;
+		if (!IS_ERR(mmc->supply.vqmmc)) {
+			ret = mmc_regulator_set_vqmmc(mmc, ios);
+			if (ret < 0) {
+				pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
+					mmc_hostname(mmc));
+				return -EIO;
+			}
+		}
+		return 0;
+	default:
+		/* No signal voltage switch required */
+		return 0;
+	}
+}
+EXPORT_SYMBOL_GPL(sdhci_start_signal_voltage_switch);
+
+static int sdhci_card_busy(struct mmc_host *mmc)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	u32 present_state;
+
+	/* Check whether DAT[0] is 0 */
+	present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
+
+	return !(present_state & SDHCI_DATA_0_LVL_MASK);
+}
+
+static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+	host->flags |= SDHCI_HS400_TUNING;
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	return 0;
+}
+
+void sdhci_start_tuning(struct sdhci_host *host)
+{
+	u16 ctrl;
+
+	ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+	ctrl |= SDHCI_CTRL_EXEC_TUNING;
+	if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
+		ctrl |= SDHCI_CTRL_TUNED_CLK;
+	sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+	/*
+	 * As per the Host Controller spec v3.00, tuning command
+	 * generates Buffer Read Ready interrupt, so enable that.
+	 *
+	 * Note: The spec clearly says that when tuning sequence
+	 * is being performed, the controller does not generate
+	 * interrupts other than Buffer Read Ready interrupt. But
+	 * to make sure we don't hit a controller bug, we _only_
+	 * enable Buffer Read Ready interrupt here.
+	 */
+	sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
+	sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
+}
+EXPORT_SYMBOL_GPL(sdhci_start_tuning);
+
+void sdhci_end_tuning(struct sdhci_host *host)
+{
+	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
+	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+}
+EXPORT_SYMBOL_GPL(sdhci_end_tuning);
+
+void sdhci_reset_tuning(struct sdhci_host *host)
+{
+	u16 ctrl;
+
+	ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+	ctrl &= ~SDHCI_CTRL_TUNED_CLK;
+	ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
+	sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+}
+EXPORT_SYMBOL_GPL(sdhci_reset_tuning);
+
+void sdhci_abort_tuning(struct sdhci_host *host, u32 opcode)
+{
+	sdhci_reset_tuning(host);
+
+	sdhci_do_reset(host, SDHCI_RESET_CMD);
+	sdhci_do_reset(host, SDHCI_RESET_DATA);
+
+	sdhci_end_tuning(host);
+
+	mmc_abort_tuning(host->mmc, opcode);
+}
+EXPORT_SYMBOL_GPL(sdhci_abort_tuning);
+
+/*
+ * We use sdhci_send_tuning() because mmc_send_tuning() is not a good fit. SDHCI
+ * tuning command does not have a data payload (or rather the hardware does it
+ * automatically) so mmc_send_tuning() will return -EIO. Also the tuning command
+ * interrupt setup is different to other commands and there is no timeout
+ * interrupt so special handling is needed.
+ */
+void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
+{
+	struct mmc_host *mmc = host->mmc;
+	struct mmc_command cmd = {};
+	struct mmc_request mrq = {};
+	unsigned long flags;
+	u32 b = host->sdma_boundary;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	cmd.opcode = opcode;
+	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+	cmd.mrq = &mrq;
+
+	mrq.cmd = &cmd;
+	/*
+	 * In response to CMD19, the card sends 64 bytes of tuning
+	 * block to the Host Controller. So we set the block size
+	 * to 64 here.
+	 */
+	if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200 &&
+	    mmc->ios.bus_width == MMC_BUS_WIDTH_8)
+		sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 128), SDHCI_BLOCK_SIZE);
+	else
+		sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 64), SDHCI_BLOCK_SIZE);
+
+	/*
+	 * The tuning block is sent by the card to the host controller.
+	 * So we set the TRNS_READ bit in the Transfer Mode register.
+	 * This also takes care of setting DMA Enable and Multi Block
+	 * Select in the same register to 0.
+	 */
+	sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
+
+	if (!sdhci_send_command_retry(host, &cmd, flags)) {
+		spin_unlock_irqrestore(&host->lock, flags);
+		host->tuning_done = 0;
+		return;
+	}
+
+	host->cmd = NULL;
+
+	sdhci_del_timer(host, &mrq);
+
+	host->tuning_done = 0;
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	/* Wait for Buffer Read Ready interrupt */
+	wait_event_timeout(host->buf_ready_int, (host->tuning_done == 1),
+			   msecs_to_jiffies(50));
+
+}
+EXPORT_SYMBOL_GPL(sdhci_send_tuning);
+
+static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
+{
+	int i;
+
+	/*
+	 * Issue opcode repeatedly till Execute Tuning is set to 0 or the number
+	 * of loops reaches tuning loop count.
+	 */
+	for (i = 0; i < host->tuning_loop_count; i++) {
+		u16 ctrl;
+
+		sdhci_send_tuning(host, opcode);
+
+		if (!host->tuning_done) {
+			pr_debug("%s: Tuning timeout, falling back to fixed sampling clock\n",
+				 mmc_hostname(host->mmc));
+			sdhci_abort_tuning(host, opcode);
+			return -ETIMEDOUT;
+		}
+
+		/* Spec does not require a delay between tuning cycles */
+		if (host->tuning_delay > 0)
+			mdelay(host->tuning_delay);
+
+		ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+		if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
+			if (ctrl & SDHCI_CTRL_TUNED_CLK)
+				return 0; /* Success! */
+			break;
+		}
+
+	}
+
+	pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
+		mmc_hostname(host->mmc));
+	sdhci_reset_tuning(host);
+	return -EAGAIN;
+}
+
+int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	int err = 0;
+	unsigned int tuning_count = 0;
+	bool hs400_tuning;
+
+	hs400_tuning = host->flags & SDHCI_HS400_TUNING;
+
+	if (host->tuning_mode == SDHCI_TUNING_MODE_1)
+		tuning_count = host->tuning_count;
+
+	/*
+	 * The Host Controller needs tuning in case of SDR104 and DDR50
+	 * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
+	 * the Capabilities register.
+	 * If the Host Controller supports the HS200 mode then the
+	 * tuning function has to be executed.
+	 */
+	switch (host->timing) {
+	/* HS400 tuning is done in HS200 mode */
+	case MMC_TIMING_MMC_HS400:
+		err = -EINVAL;
+		goto out;
+
+	case MMC_TIMING_MMC_HS200:
+		/*
+		 * Periodic re-tuning for HS400 is not expected to be needed, so
+		 * disable it here.
+		 */
+		if (hs400_tuning)
+			tuning_count = 0;
+		break;
+
+	case MMC_TIMING_UHS_SDR104:
+	case MMC_TIMING_UHS_DDR50:
+		break;
+
+	case MMC_TIMING_UHS_SDR50:
+		if (host->flags & SDHCI_SDR50_NEEDS_TUNING)
+			break;
+		fallthrough;
+
+	default:
+		goto out;
+	}
+
+	if (host->ops->platform_execute_tuning) {
+		err = host->ops->platform_execute_tuning(host, opcode);
+		goto out;
+	}
+
+	host->mmc->retune_period = tuning_count;
+
+	if (host->tuning_delay < 0)
+		host->tuning_delay = opcode == MMC_SEND_TUNING_BLOCK;
+
+	sdhci_start_tuning(host);
+
+	host->tuning_err = __sdhci_execute_tuning(host, opcode);
+
+	sdhci_end_tuning(host);
+out:
+	host->flags &= ~SDHCI_HS400_TUNING;
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
+
+static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
+{
+	/* Host Controller v3.00 defines preset value registers */
+	if (host->version < SDHCI_SPEC_300)
+		return;
+
+	/*
+	 * We only enable or disable Preset Value if they are not already
+	 * enabled or disabled respectively. Otherwise, we bail out.
+	 */
+	if (host->preset_enabled != enable) {
+		u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+
+		if (enable)
+			ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
+		else
+			ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
+
+		sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+		if (enable)
+			host->flags |= SDHCI_PV_ENABLED;
+		else
+			host->flags &= ~SDHCI_PV_ENABLED;
+
+		host->preset_enabled = enable;
+	}
+}
+
+static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
+				int err)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	struct mmc_data *data = mrq->data;
+
+	if (data->host_cookie != COOKIE_UNMAPPED)
+		dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
+			     mmc_get_dma_dir(data));
+
+	data->host_cookie = COOKIE_UNMAPPED;
+}
+
+static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+
+	mrq->data->host_cookie = COOKIE_UNMAPPED;
+
+	/*
+	 * No pre-mapping in the pre hook if we're using the bounce buffer,
+	 * for that we would need two bounce buffers since one buffer is
+	 * in flight when this is getting called.
+	 */
+	if (host->flags & SDHCI_REQ_USE_DMA && !host->bounce_buffer)
+		sdhci_pre_dma_transfer(host, mrq->data, COOKIE_PRE_MAPPED);
+}
+
+static void sdhci_error_out_mrqs(struct sdhci_host *host, int err)
+{
+	if (host->data_cmd) {
+		host->data_cmd->error = err;
+		sdhci_finish_mrq(host, host->data_cmd->mrq);
+	}
+
+	if (host->cmd) {
+		host->cmd->error = err;
+		sdhci_finish_mrq(host, host->cmd->mrq);
+	}
+}
+
+static void sdhci_card_event(struct mmc_host *mmc)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+	int present;
+
+	/* First check if client has provided their own card event */
+	if (host->ops->card_event)
+		host->ops->card_event(host);
+
+	present = mmc->ops->get_cd(mmc);
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	/* Check sdhci_has_requests() first in case we are runtime suspended */
+	if (sdhci_has_requests(host) && !present) {
+		pr_err("%s: Card removed during transfer!\n",
+			mmc_hostname(host->mmc));
+		pr_err("%s: Resetting controller.\n",
+			mmc_hostname(host->mmc));
+
+		sdhci_do_reset(host, SDHCI_RESET_CMD);
+		sdhci_do_reset(host, SDHCI_RESET_DATA);
+
+		sdhci_error_out_mrqs(host, -ENOMEDIUM);
+	}
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static const struct mmc_host_ops sdhci_ops = {
+	.request	= sdhci_request,
+	.post_req	= sdhci_post_req,
+	.pre_req	= sdhci_pre_req,
+	.set_ios	= sdhci_set_ios,
+	.get_cd		= sdhci_get_cd,
+	.get_ro		= sdhci_get_ro,
+	.hw_reset	= sdhci_hw_reset,
+	.enable_sdio_irq = sdhci_enable_sdio_irq,
+	.ack_sdio_irq    = sdhci_ack_sdio_irq,
+	.start_signal_voltage_switch	= sdhci_start_signal_voltage_switch,
+	.prepare_hs400_tuning		= sdhci_prepare_hs400_tuning,
+	.execute_tuning			= sdhci_execute_tuning,
+	.card_event			= sdhci_card_event,
+	.card_busy	= sdhci_card_busy,
+};
+
+/*****************************************************************************\
+ *                                                                           *
+ * Request done                                                              *
+ *                                                                           *
+\*****************************************************************************/
+
+static bool sdhci_request_done(struct sdhci_host *host)
+{
+	unsigned long flags;
+	struct mmc_request *mrq;
+	int i;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	for (i = 0; i < SDHCI_MAX_MRQS; i++) {
+		mrq = host->mrqs_done[i];
+		if (mrq)
+			break;
+	}
+
+	if (!mrq) {
+		spin_unlock_irqrestore(&host->lock, flags);
+		return true;
+	}
+
+	/*
+	 * The controller needs a reset of internal state machines
+	 * upon error conditions.
+	 */
+	if (sdhci_needs_reset(host, mrq)) {
+		/*
+		 * Do not finish until command and data lines are available for
+		 * reset. Note there can only be one other mrq, so it cannot
+		 * also be in mrqs_done, otherwise host->cmd and host->data_cmd
+		 * would both be null.
+		 */
+		if (host->cmd || host->data_cmd) {
+			spin_unlock_irqrestore(&host->lock, flags);
+			return true;
+		}
+
+		/* Some controllers need this kick or reset won't work here */
+		if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
+			/* This is to force an update */
+			host->ops->set_clock(host, host->clock);
+
+		/*
+		 * Spec says we should do both at the same time, but Ricoh
+		 * controllers do not like that.
+		 */
+		sdhci_do_reset(host, SDHCI_RESET_CMD);
+		sdhci_do_reset(host, SDHCI_RESET_DATA);
+
+		host->pending_reset = false;
+	}
+
+	/*
+	 * Always unmap the data buffers if they were mapped by
+	 * sdhci_prepare_data() whenever we finish with a request.
+	 * This avoids leaking DMA mappings on error.
+	 */
+	if (host->flags & SDHCI_REQ_USE_DMA) {
+		struct mmc_data *data = mrq->data;
+
+		if (host->use_external_dma && data &&
+		    (mrq->cmd->error || data->error)) {
+			struct dma_chan *chan = sdhci_external_dma_channel(host, data);
+
+			host->mrqs_done[i] = NULL;
+			spin_unlock_irqrestore(&host->lock, flags);
+			dmaengine_terminate_sync(chan);
+			spin_lock_irqsave(&host->lock, flags);
+			sdhci_set_mrq_done(host, mrq);
+		}
+
+		if (data && data->host_cookie == COOKIE_MAPPED) {
+			if (host->bounce_buffer) {
+				/*
+				 * On reads, copy the bounced data into the
+				 * sglist
+				 */
+				if (mmc_get_dma_dir(data) == DMA_FROM_DEVICE) {
+					unsigned int length = data->bytes_xfered;
+
+					if (length > host->bounce_buffer_size) {
+						pr_err("%s: bounce buffer is %u bytes but DMA claims to have transferred %u bytes\n",
+						       mmc_hostname(host->mmc),
+						       host->bounce_buffer_size,
+						       data->bytes_xfered);
+						/* Cap it down and continue */
+						length = host->bounce_buffer_size;
+					}
+					dma_sync_single_for_cpu(
+						host->mmc->parent,
+						host->bounce_addr,
+						host->bounce_buffer_size,
+						DMA_FROM_DEVICE);
+					sg_copy_from_buffer(data->sg,
+						data->sg_len,
+						host->bounce_buffer,
+						length);
+				} else {
+					/* No copying, just switch ownership */
+					dma_sync_single_for_cpu(
+						host->mmc->parent,
+						host->bounce_addr,
+						host->bounce_buffer_size,
+						mmc_get_dma_dir(data));
+				}
+			} else {
+				/* Unmap the raw data */
+				dma_unmap_sg(mmc_dev(host->mmc), data->sg,
+					     data->sg_len,
+					     mmc_get_dma_dir(data));
+			}
+			data->host_cookie = COOKIE_UNMAPPED;
+		}
+	}
+
+	host->mrqs_done[i] = NULL;
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	if (host->ops->request_done)
+		host->ops->request_done(host, mrq);
+	else
+		mmc_request_done(host->mmc, mrq);
+
+	return false;
+}
+
+static void sdhci_complete_work(struct work_struct *work)
+{
+	struct sdhci_host *host = container_of(work, struct sdhci_host,
+					       complete_work);
+
+	while (!sdhci_request_done(host))
+		;
+}
+
+static void sdhci_timeout_timer(struct timer_list *t)
+{
+	struct sdhci_host *host;
+	unsigned long flags;
+
+	host = from_timer(host, t, timer);
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
+		pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
+		       mmc_hostname(host->mmc));
+		sdhci_dumpregs(host);
+
+		host->cmd->error = -ETIMEDOUT;
+		sdhci_finish_mrq(host, host->cmd->mrq);
+	}
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void sdhci_timeout_data_timer(struct timer_list *t)
+{
+	struct sdhci_host *host;
+	unsigned long flags;
+
+	host = from_timer(host, t, data_timer);
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	if (host->data || host->data_cmd ||
+	    (host->cmd && sdhci_data_line_cmd(host->cmd))) {
+		pr_err("%s: Timeout waiting for hardware interrupt.\n",
+		       mmc_hostname(host->mmc));
+		sdhci_dumpregs(host);
+
+		if (host->data) {
+			host->data->error = -ETIMEDOUT;
+			__sdhci_finish_data(host, true);
+			queue_work(host->complete_wq, &host->complete_work);
+		} else if (host->data_cmd) {
+			host->data_cmd->error = -ETIMEDOUT;
+			sdhci_finish_mrq(host, host->data_cmd->mrq);
+		} else {
+			host->cmd->error = -ETIMEDOUT;
+			sdhci_finish_mrq(host, host->cmd->mrq);
+		}
+	}
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+/*****************************************************************************\
+ *                                                                           *
+ * Interrupt handling                                                        *
+ *                                                                           *
+\*****************************************************************************/
+
+static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
+{
+	/* Handle auto-CMD12 error */
+	if (intmask & SDHCI_INT_AUTO_CMD_ERR && host->data_cmd) {
+		struct mmc_request *mrq = host->data_cmd->mrq;
+		u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS);
+		int data_err_bit = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ?
+				   SDHCI_INT_DATA_TIMEOUT :
+				   SDHCI_INT_DATA_CRC;
+
+		/* Treat auto-CMD12 error the same as data error */
+		if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
+			*intmask_p |= data_err_bit;
+			return;
+		}
+	}
+
+	if (!host->cmd) {
+		/*
+		 * SDHCI recovers from errors by resetting the cmd and data
+		 * circuits.  Until that is done, there very well might be more
+		 * interrupts, so ignore them in that case.
+		 */
+		if (host->pending_reset)
+			return;
+		pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
+		       mmc_hostname(host->mmc), (unsigned)intmask);
+		sdhci_dumpregs(host);
+		return;
+	}
+
+	if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
+		       SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
+		if (intmask & SDHCI_INT_TIMEOUT)
+			host->cmd->error = -ETIMEDOUT;
+		else
+			host->cmd->error = -EILSEQ;
+
+		/* Treat data command CRC error the same as data CRC error */
+		if (host->cmd->data &&
+		    (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
+		     SDHCI_INT_CRC) {
+			host->cmd = NULL;
+			*intmask_p |= SDHCI_INT_DATA_CRC;
+			return;
+		}
+
+		__sdhci_finish_mrq(host, host->cmd->mrq);
+		return;
+	}
+
+	/* Handle auto-CMD23 error */
+	if (intmask & SDHCI_INT_AUTO_CMD_ERR) {
+		struct mmc_request *mrq = host->cmd->mrq;
+		u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS);
+		int err = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ?
+			  -ETIMEDOUT :
+			  -EILSEQ;
+
+		if (mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
+			mrq->sbc->error = err;
+			__sdhci_finish_mrq(host, mrq);
+			return;
+		}
+	}
+
+	if (intmask & SDHCI_INT_RESPONSE)
+		sdhci_finish_command(host);
+}
+
+static void sdhci_adma_show_error(struct sdhci_host *host)
+{
+	void *desc = host->adma_table;
+	dma_addr_t dma = host->adma_addr;
+
+	sdhci_dumpregs(host);
+
+	while (true) {
+		struct sdhci_adma2_64_desc *dma_desc = desc;
+
+		if (host->flags & SDHCI_USE_64_BIT_DMA)
+			SDHCI_DUMP("%08llx: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n",
+			    (unsigned long long)dma,
+			    le32_to_cpu(dma_desc->addr_hi),
+			    le32_to_cpu(dma_desc->addr_lo),
+			    le16_to_cpu(dma_desc->len),
+			    le16_to_cpu(dma_desc->cmd));
+		else
+			SDHCI_DUMP("%08llx: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
+			    (unsigned long long)dma,
+			    le32_to_cpu(dma_desc->addr_lo),
+			    le16_to_cpu(dma_desc->len),
+			    le16_to_cpu(dma_desc->cmd));
+
+		desc += host->desc_sz;
+		dma += host->desc_sz;
+
+		if (dma_desc->cmd & cpu_to_le16(ADMA2_END))
+			break;
+	}
+}
+
+static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
+{
+	u32 command;
+
+	/* CMD19 generates _only_ Buffer Read Ready interrupt */
+	if (intmask & SDHCI_INT_DATA_AVAIL) {
+		command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
+		if (command == MMC_SEND_TUNING_BLOCK ||
+		    command == MMC_SEND_TUNING_BLOCK_HS200) {
+			host->tuning_done = 1;
+			wake_up(&host->buf_ready_int);
+			return;
+		}
+	}
+
+	if (!host->data) {
+		struct mmc_command *data_cmd = host->data_cmd;
+
+		/*
+		 * The "data complete" interrupt is also used to
+		 * indicate that a busy state has ended. See comment
+		 * above in sdhci_cmd_irq().
+		 */
+		if (data_cmd && (data_cmd->flags & MMC_RSP_BUSY)) {
+			if (intmask & SDHCI_INT_DATA_TIMEOUT) {
+				host->data_cmd = NULL;
+				data_cmd->error = -ETIMEDOUT;
+				__sdhci_finish_mrq(host, data_cmd->mrq);
+				return;
+			}
+			if (intmask & SDHCI_INT_DATA_END) {
+				host->data_cmd = NULL;
+				/*
+				 * Some cards handle busy-end interrupt
+				 * before the command completed, so make
+				 * sure we do things in the proper order.
+				 */
+				if (host->cmd == data_cmd)
+					return;
+
+				__sdhci_finish_mrq(host, data_cmd->mrq);
+				return;
+			}
+		}
+
+		/*
+		 * SDHCI recovers from errors by resetting the cmd and data
+		 * circuits. Until that is done, there very well might be more
+		 * interrupts, so ignore them in that case.
+		 */
+		if (host->pending_reset)
+			return;
+
+		pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
+		       mmc_hostname(host->mmc), (unsigned)intmask);
+		sdhci_dumpregs(host);
+
+		return;
+	}
+
+	if (intmask & SDHCI_INT_DATA_TIMEOUT)
+		host->data->error = -ETIMEDOUT;
+	else if (intmask & SDHCI_INT_DATA_END_BIT)
+		host->data->error = -EILSEQ;
+	else if ((intmask & SDHCI_INT_DATA_CRC) &&
+		SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
+			!= MMC_BUS_TEST_R)
+		host->data->error = -EILSEQ;
+	else if (intmask & SDHCI_INT_ADMA_ERROR) {
+		pr_err("%s: ADMA error: 0x%08x\n", mmc_hostname(host->mmc),
+		       intmask);
+		sdhci_adma_show_error(host);
+		host->data->error = -EIO;
+		if (host->ops->adma_workaround)
+			host->ops->adma_workaround(host, intmask);
+	}
+
+	if (host->data->error)
+		sdhci_finish_data(host);
+	else {
+		if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
+			sdhci_transfer_pio(host);
+
+		/*
+		 * We currently don't do anything fancy with DMA
+		 * boundaries, but as we can't disable the feature
+		 * we need to at least restart the transfer.
+		 *
+		 * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
+		 * should return a valid address to continue from, but as
+		 * some controllers are faulty, don't trust them.
+		 */
+		if (intmask & SDHCI_INT_DMA_END) {
+			dma_addr_t dmastart, dmanow;
+
+			dmastart = sdhci_sdma_address(host);
+			dmanow = dmastart + host->data->bytes_xfered;
+			/*
+			 * Force update to the next DMA block boundary.
+			 */
+			dmanow = (dmanow &
+				~((dma_addr_t)SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
+				SDHCI_DEFAULT_BOUNDARY_SIZE;
+			host->data->bytes_xfered = dmanow - dmastart;
+			DBG("DMA base %pad, transferred 0x%06x bytes, next %pad\n",
+			    &dmastart, host->data->bytes_xfered, &dmanow);
+			sdhci_set_sdma_addr(host, dmanow);
+		}
+
+		if (intmask & SDHCI_INT_DATA_END) {
+			if (host->cmd == host->data_cmd) {
+				/*
+				 * Data managed to finish before the
+				 * command completed. Make sure we do
+				 * things in the proper order.
+				 */
+				host->data_early = 1;
+			} else {
+				sdhci_finish_data(host);
+			}
+		}
+	}
+}
+
+static inline bool sdhci_defer_done(struct sdhci_host *host,
+				    struct mmc_request *mrq)
+{
+	struct mmc_data *data = mrq->data;
+
+	return host->pending_reset || host->always_defer_done ||
+	       ((host->flags & SDHCI_REQ_USE_DMA) && data &&
+		data->host_cookie == COOKIE_MAPPED);
+}
+
+static irqreturn_t sdhci_irq(int irq, void *dev_id)
+{
+	struct mmc_request *mrqs_done[SDHCI_MAX_MRQS] = {0};
+	irqreturn_t result = IRQ_NONE;
+	struct sdhci_host *host = dev_id;
+	u32 intmask, mask, unexpected = 0;
+	int max_loops = 16;
+	int i;
+
+	spin_lock(&host->lock);
+
+	if (host->runtime_suspended) {
+		spin_unlock(&host->lock);
+		return IRQ_NONE;
+	}
+
+	intmask = sdhci_readl(host, SDHCI_INT_STATUS);
+	if (!intmask || intmask == 0xffffffff) {
+		result = IRQ_NONE;
+		goto out;
+	}
+
+	do {
+		DBG("IRQ status 0x%08x\n", intmask);
+
+		if (host->ops->irq) {
+			intmask = host->ops->irq(host, intmask);
+			if (!intmask)
+				goto cont;
+		}
+
+		/* Clear selected interrupts. */
+		mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
+				  SDHCI_INT_BUS_POWER);
+		sdhci_writel(host, mask, SDHCI_INT_STATUS);
+
+		if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
+			u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
+				      SDHCI_CARD_PRESENT;
+
+			/*
+			 * There is a observation on i.mx esdhc.  INSERT
+			 * bit will be immediately set again when it gets
+			 * cleared, if a card is inserted.  We have to mask
+			 * the irq to prevent interrupt storm which will
+			 * freeze the system.  And the REMOVE gets the
+			 * same situation.
+			 *
+			 * More testing are needed here to ensure it works
+			 * for other platforms though.
+			 */
+			host->ier &= ~(SDHCI_INT_CARD_INSERT |
+				       SDHCI_INT_CARD_REMOVE);
+			host->ier |= present ? SDHCI_INT_CARD_REMOVE :
+					       SDHCI_INT_CARD_INSERT;
+			sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
+			sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+
+			sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
+				     SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
+
+			host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
+						       SDHCI_INT_CARD_REMOVE);
+			result = IRQ_WAKE_THREAD;
+		}
+
+		if (intmask & SDHCI_INT_CMD_MASK)
+			sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK, &intmask);
+
+		if (intmask & SDHCI_INT_DATA_MASK)
+			sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
+
+		if (intmask & SDHCI_INT_BUS_POWER)
+			pr_err("%s: Card is consuming too much power!\n",
+				mmc_hostname(host->mmc));
+
+		if (intmask & SDHCI_INT_RETUNE)
+			mmc_retune_needed(host->mmc);
+
+		if ((intmask & SDHCI_INT_CARD_INT) &&
+		    (host->ier & SDHCI_INT_CARD_INT)) {
+			sdhci_enable_sdio_irq_nolock(host, false);
+			sdio_signal_irq(host->mmc);
+		}
+
+		intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
+			     SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
+			     SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
+			     SDHCI_INT_RETUNE | SDHCI_INT_CARD_INT);
+
+		if (intmask) {
+			unexpected |= intmask;
+			sdhci_writel(host, intmask, SDHCI_INT_STATUS);
+		}
+cont:
+		if (result == IRQ_NONE)
+			result = IRQ_HANDLED;
+
+		intmask = sdhci_readl(host, SDHCI_INT_STATUS);
+	} while (intmask && --max_loops);
+
+	/* Determine if mrqs can be completed immediately */
+	for (i = 0; i < SDHCI_MAX_MRQS; i++) {
+		struct mmc_request *mrq = host->mrqs_done[i];
+
+		if (!mrq)
+			continue;
+
+		if (sdhci_defer_done(host, mrq)) {
+			result = IRQ_WAKE_THREAD;
+		} else {
+			mrqs_done[i] = mrq;
+			host->mrqs_done[i] = NULL;
+		}
+	}
+out:
+	if (host->deferred_cmd)
+		result = IRQ_WAKE_THREAD;
+
+	spin_unlock(&host->lock);
+
+	/* Process mrqs ready for immediate completion */
+	for (i = 0; i < SDHCI_MAX_MRQS; i++) {
+		if (!mrqs_done[i])
+			continue;
+
+		if (host->ops->request_done)
+			host->ops->request_done(host, mrqs_done[i]);
+		else
+			mmc_request_done(host->mmc, mrqs_done[i]);
+	}
+
+	if (unexpected) {
+		pr_err("%s: Unexpected interrupt 0x%08x.\n",
+			   mmc_hostname(host->mmc), unexpected);
+		sdhci_dumpregs(host);
+	}
+
+	return result;
+}
+
+static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
+{
+	struct sdhci_host *host = dev_id;
+	struct mmc_command *cmd;
+	unsigned long flags;
+	u32 isr;
+
+	while (!sdhci_request_done(host))
+		;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	isr = host->thread_isr;
+	host->thread_isr = 0;
+
+	cmd = host->deferred_cmd;
+	if (cmd && !sdhci_send_command_retry(host, cmd, flags))
+		sdhci_finish_mrq(host, cmd->mrq);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
+		struct mmc_host *mmc = host->mmc;
+
+		mmc->ops->card_event(mmc);
+		mmc_detect_change(mmc, msecs_to_jiffies(200));
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*****************************************************************************\
+ *                                                                           *
+ * Suspend/resume                                                            *
+ *                                                                           *
+\*****************************************************************************/
+
+#ifdef CONFIG_PM
+
+static bool sdhci_cd_irq_can_wakeup(struct sdhci_host *host)
+{
+	return mmc_card_is_removable(host->mmc) &&
+	       !(host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
+	       !mmc_can_gpio_cd(host->mmc);
+}
+
+/*
+ * To enable wakeup events, the corresponding events have to be enabled in
+ * the Interrupt Status Enable register too. See 'Table 1-6: Wakeup Signal
+ * Table' in the SD Host Controller Standard Specification.
+ * It is useless to restore SDHCI_INT_ENABLE state in
+ * sdhci_disable_irq_wakeups() since it will be set by
+ * sdhci_enable_card_detection() or sdhci_init().
+ */
+static bool sdhci_enable_irq_wakeups(struct sdhci_host *host)
+{
+	u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE |
+		  SDHCI_WAKE_ON_INT;
+	u32 irq_val = 0;
+	u8 wake_val = 0;
+	u8 val;
+
+	if (sdhci_cd_irq_can_wakeup(host)) {
+		wake_val |= SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE;
+		irq_val |= SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE;
+	}
+
+	if (mmc_card_wake_sdio_irq(host->mmc)) {
+		wake_val |= SDHCI_WAKE_ON_INT;
+		irq_val |= SDHCI_INT_CARD_INT;
+	}
+
+	if (!irq_val)
+		return false;
+
+	val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
+	val &= ~mask;
+	val |= wake_val;
+	sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
+
+	sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
+
+	host->irq_wake_enabled = !enable_irq_wake(host->irq);
+
+	return host->irq_wake_enabled;
+}
+
+static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
+{
+	u8 val;
+	u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
+			| SDHCI_WAKE_ON_INT;
+
+	val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
+	val &= ~mask;
+	sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
+
+	disable_irq_wake(host->irq);
+
+	host->irq_wake_enabled = false;
+}
+
+int sdhci_suspend_host(struct sdhci_host *host)
+{
+	sdhci_disable_card_detection(host);
+
+	mmc_retune_timer_stop(host->mmc);
+
+	if (!device_may_wakeup(mmc_dev(host->mmc)) ||
+	    !sdhci_enable_irq_wakeups(host)) {
+		host->ier = 0;
+		sdhci_writel(host, 0, SDHCI_INT_ENABLE);
+		sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
+		free_irq(host->irq, host);
+	}
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(sdhci_suspend_host);
+
+int sdhci_resume_host(struct sdhci_host *host)
+{
+	struct mmc_host *mmc = host->mmc;
+	int ret = 0;
+
+	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
+		if (host->ops->enable_dma)
+			host->ops->enable_dma(host);
+	}
+
+	if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
+	    (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
+		/* Card keeps power but host controller does not */
+		sdhci_init(host, 0);
+		host->pwr = 0;
+		host->clock = 0;
+		host->reinit_uhs = true;
+		mmc->ops->set_ios(mmc, &mmc->ios);
+	} else {
+		sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
+	}
+
+	if (host->irq_wake_enabled) {
+		sdhci_disable_irq_wakeups(host);
+	} else {
+		ret = request_threaded_irq(host->irq, sdhci_irq,
+					   sdhci_thread_irq, IRQF_SHARED,
+					   mmc_hostname(host->mmc), host);
+		if (ret)
+			return ret;
+	}
+
+	sdhci_enable_card_detection(host);
+
+	return ret;
+}
+
+EXPORT_SYMBOL_GPL(sdhci_resume_host);
+
+int sdhci_runtime_suspend_host(struct sdhci_host *host)
+{
+	unsigned long flags;
+
+	mmc_retune_timer_stop(host->mmc);
+
+	spin_lock_irqsave(&host->lock, flags);
+	host->ier &= SDHCI_INT_CARD_INT;
+	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
+	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	synchronize_hardirq(host->irq);
+
+	spin_lock_irqsave(&host->lock, flags);
+	host->runtime_suspended = true;
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
+
+int sdhci_runtime_resume_host(struct sdhci_host *host, int soft_reset)
+{
+	struct mmc_host *mmc = host->mmc;
+	unsigned long flags;
+	int host_flags = host->flags;
+
+	if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
+		if (host->ops->enable_dma)
+			host->ops->enable_dma(host);
+	}
+
+	sdhci_init(host, soft_reset);
+
+	if (mmc->ios.power_mode != MMC_POWER_UNDEFINED &&
+	    mmc->ios.power_mode != MMC_POWER_OFF) {
+		/* Force clock and power re-program */
+		host->pwr = 0;
+		host->clock = 0;
+		host->reinit_uhs = true;
+		mmc->ops->start_signal_voltage_switch(mmc, &mmc->ios);
+		mmc->ops->set_ios(mmc, &mmc->ios);
+
+		if ((host_flags & SDHCI_PV_ENABLED) &&
+		    !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
+			spin_lock_irqsave(&host->lock, flags);
+			sdhci_enable_preset_value(host, true);
+			spin_unlock_irqrestore(&host->lock, flags);
+		}
+
+		if ((mmc->caps2 & MMC_CAP2_HS400_ES) &&
+		    mmc->ops->hs400_enhanced_strobe)
+			mmc->ops->hs400_enhanced_strobe(mmc, &mmc->ios);
+	}
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	host->runtime_suspended = false;
+
+	/* Enable SDIO IRQ */
+	if (sdio_irq_claimed(mmc))
+		sdhci_enable_sdio_irq_nolock(host, true);
+
+	/* Enable Card Detection */
+	sdhci_enable_card_detection(host);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
+
+#endif /* CONFIG_PM */
+
+/*****************************************************************************\
+ *                                                                           *
+ * Command Queue Engine (CQE) helpers                                        *
+ *                                                                           *
+\*****************************************************************************/
+
+void sdhci_cqe_enable(struct mmc_host *mmc)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+	u8 ctrl;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
+	ctrl &= ~SDHCI_CTRL_DMA_MASK;
+	/*
+	 * Host from V4.10 supports ADMA3 DMA type.
+	 * ADMA3 performs integrated descriptor which is more suitable
+	 * for cmd queuing to fetch both command and transfer descriptors.
+	 */
+	if (host->v4_mode && (host->caps1 & SDHCI_CAN_DO_ADMA3))
+		ctrl |= SDHCI_CTRL_ADMA3;
+	else if (host->flags & SDHCI_USE_64_BIT_DMA)
+		ctrl |= SDHCI_CTRL_ADMA64;
+	else
+		ctrl |= SDHCI_CTRL_ADMA32;
+	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+
+	sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, 512),
+		     SDHCI_BLOCK_SIZE);
+
+	/* Set maximum timeout */
+	sdhci_set_timeout(host, NULL);
+
+	host->ier = host->cqe_ier;
+
+	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
+	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+
+	host->cqe_on = true;
+
+	pr_debug("%s: sdhci: CQE on, IRQ mask %#x, IRQ status %#x\n",
+		 mmc_hostname(mmc), host->ier,
+		 sdhci_readl(host, SDHCI_INT_STATUS));
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+EXPORT_SYMBOL_GPL(sdhci_cqe_enable);
+
+void sdhci_cqe_disable(struct mmc_host *mmc, bool recovery)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	sdhci_set_default_irqs(host);
+
+	host->cqe_on = false;
+
+	if (recovery) {
+		sdhci_do_reset(host, SDHCI_RESET_CMD);
+		sdhci_do_reset(host, SDHCI_RESET_DATA);
+	}
+
+	pr_debug("%s: sdhci: CQE off, IRQ mask %#x, IRQ status %#x\n",
+		 mmc_hostname(mmc), host->ier,
+		 sdhci_readl(host, SDHCI_INT_STATUS));
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+EXPORT_SYMBOL_GPL(sdhci_cqe_disable);
+
+bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
+		   int *data_error)
+{
+	u32 mask;
+
+	if (!host->cqe_on)
+		return false;
+
+	if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC))
+		*cmd_error = -EILSEQ;
+	else if (intmask & SDHCI_INT_TIMEOUT)
+		*cmd_error = -ETIMEDOUT;
+	else
+		*cmd_error = 0;
+
+	if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC))
+		*data_error = -EILSEQ;
+	else if (intmask & SDHCI_INT_DATA_TIMEOUT)
+		*data_error = -ETIMEDOUT;
+	else if (intmask & SDHCI_INT_ADMA_ERROR)
+		*data_error = -EIO;
+	else
+		*data_error = 0;
+
+	/* Clear selected interrupts. */
+	mask = intmask & host->cqe_ier;
+	sdhci_writel(host, mask, SDHCI_INT_STATUS);
+
+	if (intmask & SDHCI_INT_BUS_POWER)
+		pr_err("%s: Card is consuming too much power!\n",
+		       mmc_hostname(host->mmc));
+
+	intmask &= ~(host->cqe_ier | SDHCI_INT_ERROR);
+	if (intmask) {
+		sdhci_writel(host, intmask, SDHCI_INT_STATUS);
+		pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n",
+		       mmc_hostname(host->mmc), intmask);
+		sdhci_dumpregs(host);
+	}
+
+	return true;
+}
+EXPORT_SYMBOL_GPL(sdhci_cqe_irq);
+
+/*****************************************************************************\
+ *                                                                           *
+ * Device allocation/registration                                            *
+ *                                                                           *
+\*****************************************************************************/
+
+struct sdhci_host *sdhci_alloc_host(struct device *dev,
+	size_t priv_size)
+{
+	struct mmc_host *mmc;
+	struct sdhci_host *host;
+
+	WARN_ON(dev == NULL);
+
+	mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
+	if (!mmc)
+		return ERR_PTR(-ENOMEM);
+
+	host = mmc_priv(mmc);
+	host->mmc = mmc;
+	host->mmc_host_ops = sdhci_ops;
+	mmc->ops = &host->mmc_host_ops;
+
+	host->flags = SDHCI_SIGNALING_330;
+
+	host->cqe_ier     = SDHCI_CQE_INT_MASK;
+	host->cqe_err_ier = SDHCI_CQE_INT_ERR_MASK;
+
+	host->tuning_delay = -1;
+	host->tuning_loop_count = MAX_TUNING_LOOP;
+
+	host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG;
+
+	/*
+	 * The DMA table descriptor count is calculated as the maximum
+	 * number of segments times 2, to allow for an alignment
+	 * descriptor for each segment, plus 1 for a nop end descriptor.
+	 */
+	host->adma_table_cnt = SDHCI_MAX_SEGS * 2 + 1;
+	host->max_adma = 65536;
+
+	return host;
+}
+
+EXPORT_SYMBOL_GPL(sdhci_alloc_host);
+
+static int sdhci_set_dma_mask(struct sdhci_host *host)
+{
+	struct mmc_host *mmc = host->mmc;
+	struct device *dev = mmc_dev(mmc);
+	int ret = -EINVAL;
+
+	if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA)
+		host->flags &= ~SDHCI_USE_64_BIT_DMA;
+
+	/* Try 64-bit mask if hardware is capable  of it */
+	if (host->flags & SDHCI_USE_64_BIT_DMA) {
+		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
+		if (ret) {
+			pr_warn("%s: Failed to set 64-bit DMA mask.\n",
+				mmc_hostname(mmc));
+			host->flags &= ~SDHCI_USE_64_BIT_DMA;
+		}
+	}
+
+	/* 32-bit mask as default & fallback */
+	if (ret) {
+		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+		if (ret)
+			pr_warn("%s: Failed to set 32-bit DMA mask.\n",
+				mmc_hostname(mmc));
+	}
+
+	return ret;
+}
+
+void __sdhci_read_caps(struct sdhci_host *host, const u16 *ver,
+		       const u32 *caps, const u32 *caps1)
+{
+	u16 v;
+	u64 dt_caps_mask = 0;
+	u64 dt_caps = 0;
+
+	if (host->read_caps)
+		return;
+
+	host->read_caps = true;
+
+	if (debug_quirks)
+		host->quirks = debug_quirks;
+
+	if (debug_quirks2)
+		host->quirks2 = debug_quirks2;
+
+	sdhci_do_reset(host, SDHCI_RESET_ALL);
+
+	if (host->v4_mode)
+		sdhci_do_enable_v4_mode(host);
+
+	device_property_read_u64_array(mmc_dev(host->mmc),
+				       "sdhci-caps-mask", &dt_caps_mask, 1);
+	device_property_read_u64_array(mmc_dev(host->mmc),
+				       "sdhci-caps", &dt_caps, 1);
+
+	v = ver ? *ver : sdhci_readw(host, SDHCI_HOST_VERSION);
+	host->version = (v & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
+
+	if (host->quirks & SDHCI_QUIRK_MISSING_CAPS)
+		return;
+
+	if (caps) {
+		host->caps = *caps;
+	} else {
+		host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
+		host->caps &= ~lower_32_bits(dt_caps_mask);
+		host->caps |= lower_32_bits(dt_caps);
+	}
+
+	if (host->version < SDHCI_SPEC_300)
+		return;
+
+	if (caps1) {
+		host->caps1 = *caps1;
+	} else {
+		host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
+		host->caps1 &= ~upper_32_bits(dt_caps_mask);
+		host->caps1 |= upper_32_bits(dt_caps);
+	}
+}
+EXPORT_SYMBOL_GPL(__sdhci_read_caps);
+
+static void sdhci_allocate_bounce_buffer(struct sdhci_host *host)
+{
+	struct mmc_host *mmc = host->mmc;
+	unsigned int max_blocks;
+	unsigned int bounce_size;
+	int ret;
+
+	/*
+	 * Cap the bounce buffer at 64KB. Using a bigger bounce buffer
+	 * has diminishing returns, this is probably because SD/MMC
+	 * cards are usually optimized to handle this size of requests.
+	 */
+	bounce_size = SZ_64K;
+	/*
+	 * Adjust downwards to maximum request size if this is less
+	 * than our segment size, else hammer down the maximum
+	 * request size to the maximum buffer size.
+	 */
+	if (mmc->max_req_size < bounce_size)
+		bounce_size = mmc->max_req_size;
+	max_blocks = bounce_size / 512;
+
+	/*
+	 * When we just support one segment, we can get significant
+	 * speedups by the help of a bounce buffer to group scattered
+	 * reads/writes together.
+	 */
+	host->bounce_buffer = devm_kmalloc(mmc->parent,
+					   bounce_size,
+					   GFP_KERNEL);
+	if (!host->bounce_buffer) {
+		pr_err("%s: failed to allocate %u bytes for bounce buffer, falling back to single segments\n",
+		       mmc_hostname(mmc),
+		       bounce_size);
+		/*
+		 * Exiting with zero here makes sure we proceed with
+		 * mmc->max_segs == 1.
+		 */
+		return;
+	}
+
+	host->bounce_addr = dma_map_single(mmc->parent,
+					   host->bounce_buffer,
+					   bounce_size,
+					   DMA_BIDIRECTIONAL);
+	ret = dma_mapping_error(mmc->parent, host->bounce_addr);
+	if (ret)
+		/* Again fall back to max_segs == 1 */
+		return;
+	host->bounce_buffer_size = bounce_size;
+
+	/* Lie about this since we're bouncing */
+	mmc->max_segs = max_blocks;
+	mmc->max_seg_size = bounce_size;
+	mmc->max_req_size = bounce_size;
+
+	pr_info("%s bounce up to %u segments into one, max segment size %u bytes\n",
+		mmc_hostname(mmc), max_blocks, bounce_size);
+}
+
+static inline bool sdhci_can_64bit_dma(struct sdhci_host *host)
+{
+	/*
+	 * According to SD Host Controller spec v4.10, bit[27] added from
+	 * version 4.10 in Capabilities Register is used as 64-bit System
+	 * Address support for V4 mode.
+	 */
+	if (host->version >= SDHCI_SPEC_410 && host->v4_mode)
+		return host->caps & SDHCI_CAN_64BIT_V4;
+
+	return host->caps & SDHCI_CAN_64BIT;
+}
+
+int sdhci_setup_host(struct sdhci_host *host)
+{
+	struct mmc_host *mmc;
+	u32 max_current_caps;
+	unsigned int ocr_avail;
+	unsigned int override_timeout_clk;
+	u32 max_clk;
+	int ret = 0;
+	bool enable_vqmmc = false;
+
+	WARN_ON(host == NULL);
+	if (host == NULL)
+		return -EINVAL;
+
+	mmc = host->mmc;
+
+	/*
+	 * If there are external regulators, get them. Note this must be done
+	 * early before resetting the host and reading the capabilities so that
+	 * the host can take the appropriate action if regulators are not
+	 * available.
+	 */
+	if (!mmc->supply.vqmmc) {
+		ret = mmc_regulator_get_supply(mmc);
+		if (ret)
+			return ret;
+		enable_vqmmc  = true;
+	}
+
+	DBG("Version:   0x%08x | Present:  0x%08x\n",
+	    sdhci_readw(host, SDHCI_HOST_VERSION),
+	    sdhci_readl(host, SDHCI_PRESENT_STATE));
+	DBG("Caps:      0x%08x | Caps_1:   0x%08x\n",
+	    sdhci_readl(host, SDHCI_CAPABILITIES),
+	    sdhci_readl(host, SDHCI_CAPABILITIES_1));
+
+	sdhci_read_caps(host);
+
+	override_timeout_clk = host->timeout_clk;
+
+	if (host->version > SDHCI_SPEC_420) {
+		pr_err("%s: Unknown controller version (%d). You may experience problems.\n",
+		       mmc_hostname(mmc), host->version);
+	}
+
+	if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
+		host->flags |= SDHCI_USE_SDMA;
+	else if (!(host->caps & SDHCI_CAN_DO_SDMA))
+		DBG("Controller doesn't have SDMA capability\n");
+	else
+		host->flags |= SDHCI_USE_SDMA;
+
+	if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
+		(host->flags & SDHCI_USE_SDMA)) {
+		DBG("Disabling DMA as it is marked broken\n");
+		host->flags &= ~SDHCI_USE_SDMA;
+	}
+
+	if ((host->version >= SDHCI_SPEC_200) &&
+		(host->caps & SDHCI_CAN_DO_ADMA2))
+		host->flags |= SDHCI_USE_ADMA;
+
+	if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
+		(host->flags & SDHCI_USE_ADMA)) {
+		DBG("Disabling ADMA as it is marked broken\n");
+		host->flags &= ~SDHCI_USE_ADMA;
+	}
+
+	if (sdhci_can_64bit_dma(host))
+		host->flags |= SDHCI_USE_64_BIT_DMA;
+
+	if (host->use_external_dma) {
+		ret = sdhci_external_dma_init(host);
+		if (ret == -EPROBE_DEFER)
+			goto unreg;
+		/*
+		 * Fall back to use the DMA/PIO integrated in standard SDHCI
+		 * instead of external DMA devices.
+		 */
+		else if (ret)
+			sdhci_switch_external_dma(host, false);
+		/* Disable internal DMA sources */
+		else
+			host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
+	}
+
+	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
+		if (host->ops->set_dma_mask)
+			ret = host->ops->set_dma_mask(host);
+		else
+			ret = sdhci_set_dma_mask(host);
+
+		if (!ret && host->ops->enable_dma)
+			ret = host->ops->enable_dma(host);
+
+		if (ret) {
+			pr_warn("%s: No suitable DMA available - falling back to PIO\n",
+				mmc_hostname(mmc));
+			host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
+
+			ret = 0;
+		}
+	}
+
+	/* SDMA does not support 64-bit DMA if v4 mode not set */
+	if ((host->flags & SDHCI_USE_64_BIT_DMA) && !host->v4_mode)
+		host->flags &= ~SDHCI_USE_SDMA;
+
+	if (host->flags & SDHCI_USE_ADMA) {
+		dma_addr_t dma;
+		void *buf;
+
+		if (!(host->flags & SDHCI_USE_64_BIT_DMA))
+			host->alloc_desc_sz = SDHCI_ADMA2_32_DESC_SZ;
+		else if (!host->alloc_desc_sz)
+			host->alloc_desc_sz = SDHCI_ADMA2_64_DESC_SZ(host);
+
+		host->desc_sz = host->alloc_desc_sz;
+		host->adma_table_sz = host->adma_table_cnt * host->desc_sz;
+
+		host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN;
+		/*
+		 * Use zalloc to zero the reserved high 32-bits of 128-bit
+		 * descriptors so that they never need to be written.
+		 */
+		buf = dma_alloc_coherent(mmc_dev(mmc),
+					 host->align_buffer_sz + host->adma_table_sz,
+					 &dma, GFP_KERNEL);
+		if (!buf) {
+			pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
+				mmc_hostname(mmc));
+			host->flags &= ~SDHCI_USE_ADMA;
+		} else if ((dma + host->align_buffer_sz) &
+			   (SDHCI_ADMA2_DESC_ALIGN - 1)) {
+			pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
+				mmc_hostname(mmc));
+			host->flags &= ~SDHCI_USE_ADMA;
+			dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
+					  host->adma_table_sz, buf, dma);
+		} else {
+			host->align_buffer = buf;
+			host->align_addr = dma;
+
+			host->adma_table = buf + host->align_buffer_sz;
+			host->adma_addr = dma + host->align_buffer_sz;
+		}
+	}
+
+	/*
+	 * If we use DMA, then it's up to the caller to set the DMA
+	 * mask, but PIO does not need the hw shim so we set a new
+	 * mask here in that case.
+	 */
+	if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
+		host->dma_mask = DMA_BIT_MASK(64);
+		mmc_dev(mmc)->dma_mask = &host->dma_mask;
+	}
+
+	if (host->version >= SDHCI_SPEC_300)
+		host->max_clk = FIELD_GET(SDHCI_CLOCK_V3_BASE_MASK, host->caps);
+	else
+		host->max_clk = FIELD_GET(SDHCI_CLOCK_BASE_MASK, host->caps);
+
+	host->max_clk *= 1000000;
+	if (host->max_clk == 0 || host->quirks &
+			SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
+		if (!host->ops->get_max_clock) {
+			pr_err("%s: Hardware doesn't specify base clock frequency.\n",
+			       mmc_hostname(mmc));
+			ret = -ENODEV;
+			goto undma;
+		}
+		host->max_clk = host->ops->get_max_clock(host);
+	}
+
+	/*
+	 * In case of Host Controller v3.00, find out whether clock
+	 * multiplier is supported.
+	 */
+	host->clk_mul = FIELD_GET(SDHCI_CLOCK_MUL_MASK, host->caps1);
+
+	/*
+	 * In case the value in Clock Multiplier is 0, then programmable
+	 * clock mode is not supported, otherwise the actual clock
+	 * multiplier is one more than the value of Clock Multiplier
+	 * in the Capabilities Register.
+	 */
+	if (host->clk_mul)
+		host->clk_mul += 1;
+
+	/*
+	 * Set host parameters.
+	 */
+	max_clk = host->max_clk;
+
+	if (host->ops->get_min_clock)
+		mmc->f_min = host->ops->get_min_clock(host);
+	else if (host->version >= SDHCI_SPEC_300) {
+		if (host->clk_mul)
+			max_clk = host->max_clk * host->clk_mul;
+		/*
+		 * Divided Clock Mode minimum clock rate is always less than
+		 * Programmable Clock Mode minimum clock rate.
+		 */
+		mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
+	} else
+		mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
+
+	if (!mmc->f_max || mmc->f_max > max_clk)
+		mmc->f_max = max_clk;
+
+	if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
+		host->timeout_clk = FIELD_GET(SDHCI_TIMEOUT_CLK_MASK, host->caps);
+
+		if (host->caps & SDHCI_TIMEOUT_CLK_UNIT)
+			host->timeout_clk *= 1000;
+
+		if (host->timeout_clk == 0) {
+			if (!host->ops->get_timeout_clock) {
+				pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
+					mmc_hostname(mmc));
+				ret = -ENODEV;
+				goto undma;
+			}
+
+			host->timeout_clk =
+				DIV_ROUND_UP(host->ops->get_timeout_clock(host),
+					     1000);
+		}
+
+		if (override_timeout_clk)
+			host->timeout_clk = override_timeout_clk;
+
+		mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
+			host->ops->get_max_timeout_count(host) : 1 << 27;
+		mmc->max_busy_timeout /= host->timeout_clk;
+	}
+
+	if (host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT &&
+	    !host->ops->get_max_timeout_count)
+		mmc->max_busy_timeout = 0;
+
+	mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_CMD23;
+	mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
+
+	if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
+		host->flags |= SDHCI_AUTO_CMD12;
+
+	/*
+	 * For v3 mode, Auto-CMD23 stuff only works in ADMA or PIO.
+	 * For v4 mode, SDMA may use Auto-CMD23 as well.
+	 */
+	if ((host->version >= SDHCI_SPEC_300) &&
+	    ((host->flags & SDHCI_USE_ADMA) ||
+	     !(host->flags & SDHCI_USE_SDMA) || host->v4_mode) &&
+	     !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
+		host->flags |= SDHCI_AUTO_CMD23;
+		DBG("Auto-CMD23 available\n");
+	} else {
+		DBG("Auto-CMD23 unavailable\n");
+	}
+
+	/*
+	 * A controller may support 8-bit width, but the board itself
+	 * might not have the pins brought out.  Boards that support
+	 * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
+	 * their platform code before calling sdhci_add_host(), and we
+	 * won't assume 8-bit width for hosts without that CAP.
+	 */
+	if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
+		mmc->caps |= MMC_CAP_4_BIT_DATA;
+
+	if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
+		mmc->caps &= ~MMC_CAP_CMD23;
+
+	if (host->caps & SDHCI_CAN_DO_HISPD)
+		mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
+
+	if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
+	    mmc_card_is_removable(mmc) &&
+	    mmc_gpio_get_cd(host->mmc) < 0)
+		mmc->caps |= MMC_CAP_NEEDS_POLL;
+
+	if (!IS_ERR(mmc->supply.vqmmc)) {
+		if (enable_vqmmc) {
+			ret = regulator_enable(mmc->supply.vqmmc);
+			host->sdhci_core_to_disable_vqmmc = !ret;
+		}
+
+		/* If vqmmc provides no 1.8V signalling, then there's no UHS */
+		if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
+						    1950000))
+			host->caps1 &= ~(SDHCI_SUPPORT_SDR104 |
+					 SDHCI_SUPPORT_SDR50 |
+					 SDHCI_SUPPORT_DDR50);
+
+		/* In eMMC case vqmmc might be a fixed 1.8V regulator */
+		if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000,
+						    3600000))
+			host->flags &= ~SDHCI_SIGNALING_330;
+
+		if (ret) {
+			pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
+				mmc_hostname(mmc), ret);
+			mmc->supply.vqmmc = ERR_PTR(-EINVAL);
+		}
+
+	}
+
+	if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
+		host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
+				 SDHCI_SUPPORT_DDR50);
+		/*
+		 * The SDHCI controller in a SoC might support HS200/HS400
+		 * (indicated using mmc-hs200-1_8v/mmc-hs400-1_8v dt property),
+		 * but if the board is modeled such that the IO lines are not
+		 * connected to 1.8v then HS200/HS400 cannot be supported.
+		 * Disable HS200/HS400 if the board does not have 1.8v connected
+		 * to the IO lines. (Applicable for other modes in 1.8v)
+		 */
+		mmc->caps2 &= ~(MMC_CAP2_HSX00_1_8V | MMC_CAP2_HS400_ES);
+		mmc->caps &= ~(MMC_CAP_1_8V_DDR | MMC_CAP_UHS);
+	}
+
+	/* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
+	if (host->caps1 & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
+			   SDHCI_SUPPORT_DDR50))
+		mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
+
+	/* SDR104 supports also implies SDR50 support */
+	if (host->caps1 & SDHCI_SUPPORT_SDR104) {
+		mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
+		/* SD3.0: SDR104 is supported so (for eMMC) the caps2
+		 * field can be promoted to support HS200.
+		 */
+		if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
+			mmc->caps2 |= MMC_CAP2_HS200;
+	} else if (host->caps1 & SDHCI_SUPPORT_SDR50) {
+		mmc->caps |= MMC_CAP_UHS_SDR50;
+	}
+
+	if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 &&
+	    (host->caps1 & SDHCI_SUPPORT_HS400))
+		mmc->caps2 |= MMC_CAP2_HS400;
+
+	if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) &&
+	    (IS_ERR(mmc->supply.vqmmc) ||
+	     !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000,
+					     1300000)))
+		mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V;
+
+	if ((host->caps1 & SDHCI_SUPPORT_DDR50) &&
+	    !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
+		mmc->caps |= MMC_CAP_UHS_DDR50;
+
+	/* Does the host need tuning for SDR50? */
+	if (host->caps1 & SDHCI_USE_SDR50_TUNING)
+		host->flags |= SDHCI_SDR50_NEEDS_TUNING;
+
+	/* Driver Type(s) (A, C, D) supported by the host */
+	if (host->caps1 & SDHCI_DRIVER_TYPE_A)
+		mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
+	if (host->caps1 & SDHCI_DRIVER_TYPE_C)
+		mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
+	if (host->caps1 & SDHCI_DRIVER_TYPE_D)
+		mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
+
+	/* Initial value for re-tuning timer count */
+	host->tuning_count = FIELD_GET(SDHCI_RETUNING_TIMER_COUNT_MASK,
+				       host->caps1);
+
+	/*
+	 * In case Re-tuning Timer is not disabled, the actual value of
+	 * re-tuning timer will be 2 ^ (n - 1).
+	 */
+	if (host->tuning_count)
+		host->tuning_count = 1 << (host->tuning_count - 1);
+
+	/* Re-tuning mode supported by the Host Controller */
+	host->tuning_mode = FIELD_GET(SDHCI_RETUNING_MODE_MASK, host->caps1);
+
+	ocr_avail = 0;
+
+	/*
+	 * According to SD Host Controller spec v3.00, if the Host System
+	 * can afford more than 150mA, Host Driver should set XPC to 1. Also
+	 * the value is meaningful only if Voltage Support in the Capabilities
+	 * register is set. The actual current value is 4 times the register
+	 * value.
+	 */
+	max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
+	if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
+		int curr = regulator_get_current_limit(mmc->supply.vmmc);
+		if (curr > 0) {
+
+			/* convert to SDHCI_MAX_CURRENT format */
+			curr = curr/1000;  /* convert to mA */
+			curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
+
+			curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
+			max_current_caps =
+				FIELD_PREP(SDHCI_MAX_CURRENT_330_MASK, curr) |
+				FIELD_PREP(SDHCI_MAX_CURRENT_300_MASK, curr) |
+				FIELD_PREP(SDHCI_MAX_CURRENT_180_MASK, curr);
+		}
+	}
+
+	if (host->caps & SDHCI_CAN_VDD_330) {
+		ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
+
+		mmc->max_current_330 = FIELD_GET(SDHCI_MAX_CURRENT_330_MASK,
+						 max_current_caps) *
+						SDHCI_MAX_CURRENT_MULTIPLIER;
+	}
+	if (host->caps & SDHCI_CAN_VDD_300) {
+		ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
+
+		mmc->max_current_300 = FIELD_GET(SDHCI_MAX_CURRENT_300_MASK,
+						 max_current_caps) *
+						SDHCI_MAX_CURRENT_MULTIPLIER;
+	}
+	if (host->caps & SDHCI_CAN_VDD_180) {
+		ocr_avail |= MMC_VDD_165_195;
+
+		mmc->max_current_180 = FIELD_GET(SDHCI_MAX_CURRENT_180_MASK,
+						 max_current_caps) *
+						SDHCI_MAX_CURRENT_MULTIPLIER;
+	}
+
+	/* If OCR set by host, use it instead. */
+	if (host->ocr_mask)
+		ocr_avail = host->ocr_mask;
+
+	/* If OCR set by external regulators, give it highest prio. */
+	if (mmc->ocr_avail)
+		ocr_avail = mmc->ocr_avail;
+
+	mmc->ocr_avail = ocr_avail;
+	mmc->ocr_avail_sdio = ocr_avail;
+	if (host->ocr_avail_sdio)
+		mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
+	mmc->ocr_avail_sd = ocr_avail;
+	if (host->ocr_avail_sd)
+		mmc->ocr_avail_sd &= host->ocr_avail_sd;
+	else /* normal SD controllers don't support 1.8V */
+		mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
+	mmc->ocr_avail_mmc = ocr_avail;
+	if (host->ocr_avail_mmc)
+		mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
+
+	if (mmc->ocr_avail == 0) {
+		pr_err("%s: Hardware doesn't report any support voltages.\n",
+		       mmc_hostname(mmc));
+		ret = -ENODEV;
+		goto unreg;
+	}
+
+	if ((mmc->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
+			  MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
+			  MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR)) ||
+	    (mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR | MMC_CAP2_HS400_1_8V)))
+		host->flags |= SDHCI_SIGNALING_180;
+
+	if (mmc->caps2 & MMC_CAP2_HSX00_1_2V)
+		host->flags |= SDHCI_SIGNALING_120;
+
+	spin_lock_init(&host->lock);
+
+	/*
+	 * Maximum number of sectors in one transfer. Limited by SDMA boundary
+	 * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
+	 * is less anyway.
+	 */
+	mmc->max_req_size = 524288;
+
+	/*
+	 * Maximum number of segments. Depends on if the hardware
+	 * can do scatter/gather or not.
+	 */
+	if (host->flags & SDHCI_USE_ADMA) {
+		mmc->max_segs = SDHCI_MAX_SEGS;
+	} else if (host->flags & SDHCI_USE_SDMA) {
+		mmc->max_segs = 1;
+		if (swiotlb_max_segment()) {
+			unsigned int max_req_size = (1 << IO_TLB_SHIFT) *
+						IO_TLB_SEGSIZE;
+			mmc->max_req_size = min(mmc->max_req_size,
+						max_req_size);
+		}
+	} else { /* PIO */
+		mmc->max_segs = SDHCI_MAX_SEGS;
+	}
+
+	/*
+	 * Maximum segment size. Could be one segment with the maximum number
+	 * of bytes. When doing hardware scatter/gather, each entry cannot
+	 * be larger than 64 KiB though.
+	 */
+	if (host->flags & SDHCI_USE_ADMA) {
+		if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC) {
+			host->max_adma = 65532; /* 32-bit alignment */
+			mmc->max_seg_size = 65535;
+		} else {
+			mmc->max_seg_size = 65536;
+		}
+	} else {
+		mmc->max_seg_size = mmc->max_req_size;
+	}
+
+	/*
+	 * Maximum block size. This varies from controller to controller and
+	 * is specified in the capabilities register.
+	 */
+	if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
+		mmc->max_blk_size = 2;
+	} else {
+		mmc->max_blk_size = (host->caps & SDHCI_MAX_BLOCK_MASK) >>
+				SDHCI_MAX_BLOCK_SHIFT;
+		if (mmc->max_blk_size >= 3) {
+			pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
+				mmc_hostname(mmc));
+			mmc->max_blk_size = 0;
+		}
+	}
+
+	mmc->max_blk_size = 512 << mmc->max_blk_size;
+
+	/*
+	 * Maximum block count.
+	 */
+	mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
+
+	if (mmc->max_segs == 1)
+		/* This may alter mmc->*_blk_* parameters */
+		sdhci_allocate_bounce_buffer(host);
+
+	return 0;
+
+unreg:
+	if (host->sdhci_core_to_disable_vqmmc)
+		regulator_disable(mmc->supply.vqmmc);
+undma:
+	if (host->align_buffer)
+		dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
+				  host->adma_table_sz, host->align_buffer,
+				  host->align_addr);
+	host->adma_table = NULL;
+	host->align_buffer = NULL;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sdhci_setup_host);
+
+void sdhci_cleanup_host(struct sdhci_host *host)
+{
+	struct mmc_host *mmc = host->mmc;
+
+	if (host->sdhci_core_to_disable_vqmmc)
+		regulator_disable(mmc->supply.vqmmc);
+
+	if (host->align_buffer)
+		dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
+				  host->adma_table_sz, host->align_buffer,
+				  host->align_addr);
+
+	if (host->use_external_dma)
+		sdhci_external_dma_release(host);
+
+	host->adma_table = NULL;
+	host->align_buffer = NULL;
+}
+EXPORT_SYMBOL_GPL(sdhci_cleanup_host);
+
+int __sdhci_add_host(struct sdhci_host *host)
+{
+	unsigned int flags = WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI;
+	struct mmc_host *mmc = host->mmc;
+	int ret;
+
+	if ((mmc->caps2 & MMC_CAP2_CQE) &&
+	    (host->quirks & SDHCI_QUIRK_BROKEN_CQE)) {
+		mmc->caps2 &= ~MMC_CAP2_CQE;
+		mmc->cqe_ops = NULL;
+	}
+
+	host->complete_wq = alloc_workqueue("sdhci", flags, 0);
+	if (!host->complete_wq)
+		return -ENOMEM;
+
+	INIT_WORK(&host->complete_work, sdhci_complete_work);
+
+	timer_setup(&host->timer, sdhci_timeout_timer, 0);
+	timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0);
+
+	init_waitqueue_head(&host->buf_ready_int);
+
+	sdhci_init(host, 0);
+
+	ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
+				   IRQF_SHARED,	mmc_hostname(mmc), host);
+	if (ret) {
+		pr_err("%s: Failed to request IRQ %d: %d\n",
+		       mmc_hostname(mmc), host->irq, ret);
+		goto unwq;
+	}
+
+	ret = sdhci_led_register(host);
+	if (ret) {
+		pr_err("%s: Failed to register LED device: %d\n",
+		       mmc_hostname(mmc), ret);
+		goto unirq;
+	}
+
+	ret = mmc_add_host(mmc);
+	if (ret)
+		goto unled;
+
+	pr_info("%s: SDHCI controller on %s [%s] using %s\n",
+		mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
+		host->use_external_dma ? "External DMA" :
+		(host->flags & SDHCI_USE_ADMA) ?
+		(host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
+		(host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
+
+	sdhci_enable_card_detection(host);
+
+	return 0;
+
+unled:
+	sdhci_led_unregister(host);
+unirq:
+	sdhci_do_reset(host, SDHCI_RESET_ALL);
+	sdhci_writel(host, 0, SDHCI_INT_ENABLE);
+	sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
+	free_irq(host->irq, host);
+unwq:
+	destroy_workqueue(host->complete_wq);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(__sdhci_add_host);
+
+int sdhci_add_host(struct sdhci_host *host)
+{
+	int ret;
+
+	ret = sdhci_setup_host(host);
+	if (ret)
+		return ret;
+
+	ret = __sdhci_add_host(host);
+	if (ret)
+		goto cleanup;
+
+	return 0;
+
+cleanup:
+	sdhci_cleanup_host(host);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sdhci_add_host);
+
+void sdhci_remove_host(struct sdhci_host *host, int dead)
+{
+	struct mmc_host *mmc = host->mmc;
+	unsigned long flags;
+
+	if (dead) {
+		spin_lock_irqsave(&host->lock, flags);
+
+		host->flags |= SDHCI_DEVICE_DEAD;
+
+		if (sdhci_has_requests(host)) {
+			pr_err("%s: Controller removed during "
+				" transfer!\n", mmc_hostname(mmc));
+			sdhci_error_out_mrqs(host, -ENOMEDIUM);
+		}
+
+		spin_unlock_irqrestore(&host->lock, flags);
+	}
+
+	sdhci_disable_card_detection(host);
+
+	mmc_remove_host(mmc);
+
+	sdhci_led_unregister(host);
+
+	if (!dead)
+		sdhci_do_reset(host, SDHCI_RESET_ALL);
+
+	sdhci_writel(host, 0, SDHCI_INT_ENABLE);
+	sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
+	free_irq(host->irq, host);
+
+	del_timer_sync(&host->timer);
+	del_timer_sync(&host->data_timer);
+
+	destroy_workqueue(host->complete_wq);
+
+	if (host->sdhci_core_to_disable_vqmmc)
+		regulator_disable(mmc->supply.vqmmc);
+
+	if (host->align_buffer)
+		dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
+				  host->adma_table_sz, host->align_buffer,
+				  host->align_addr);
+
+	if (host->use_external_dma)
+		sdhci_external_dma_release(host);
+
+	host->adma_table = NULL;
+	host->align_buffer = NULL;
+}
+
+EXPORT_SYMBOL_GPL(sdhci_remove_host);
+
+void sdhci_free_host(struct sdhci_host *host)
+{
+	mmc_free_host(host->mmc);
+}
+
+EXPORT_SYMBOL_GPL(sdhci_free_host);
+
+/*****************************************************************************\
+ *                                                                           *
+ * Driver init/exit                                                          *
+ *                                                                           *
+\*****************************************************************************/
+
+static int __init sdhci_drv_init(void)
+{
+	pr_info(DRIVER_NAME
+		": Secure Digital Host Controller Interface driver\n");
+	pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
+
+	return 0;
+}
+
+static void __exit sdhci_drv_exit(void)
+{
+}
+
+module_init(sdhci_drv_init);
+module_exit(sdhci_drv_exit);
+
+module_param(debug_quirks, uint, 0444);
+module_param(debug_quirks2, uint, 0444);
+
+MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
+MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
+MODULE_LICENSE("GPL");
+
+MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
+MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");