Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 2401 insertions, 0 deletions

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
new file mode 100644
index 000000000..a72ca7416
--- /dev/null
+++ b/drivers/mmc/host/mmci.c
@@ -0,0 +1,2401 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/drivers/mmc/host/mmci.c - ARM PrimeCell MMCI PL180/1 driver
+ *
+ *  Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
+ *  Copyright (C) 2010 ST-Ericsson SA
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/highmem.h>
+#include <linux/log2.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/pm.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sd.h>
+#include <linux/mmc/slot-gpio.h>
+#include <linux/amba/bus.h>
+#include <linux/clk.h>
+#include <linux/scatterlist.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/amba/mmci.h>
+#include <linux/pm_runtime.h>
+#include <linux/types.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/reset.h>
+
+#include <asm/div64.h>
+#include <asm/io.h>
+
+#include "mmci.h"
+
+#define DRIVER_NAME "mmci-pl18x"
+
+static void mmci_variant_init(struct mmci_host *host);
+static void ux500_variant_init(struct mmci_host *host);
+static void ux500v2_variant_init(struct mmci_host *host);
+
+static unsigned int fmax = 515633;
+
+static struct variant_data variant_arm = {
+	.fifosize		= 16 * 4,
+	.fifohalfsize		= 8 * 4,
+	.cmdreg_cpsm_enable	= MCI_CPSM_ENABLE,
+	.cmdreg_lrsp_crc	= MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
+	.cmdreg_srsp_crc	= MCI_CPSM_RESPONSE,
+	.cmdreg_srsp		= MCI_CPSM_RESPONSE,
+	.datalength_bits	= 16,
+	.datactrl_blocksz	= 11,
+	.pwrreg_powerup		= MCI_PWR_UP,
+	.f_max			= 100000000,
+	.reversed_irq_handling	= true,
+	.mmcimask1		= true,
+	.irq_pio_mask		= MCI_IRQ_PIO_MASK,
+	.start_err		= MCI_STARTBITERR,
+	.opendrain		= MCI_ROD,
+	.init			= mmci_variant_init,
+};
+
+static struct variant_data variant_arm_extended_fifo = {
+	.fifosize		= 128 * 4,
+	.fifohalfsize		= 64 * 4,
+	.cmdreg_cpsm_enable	= MCI_CPSM_ENABLE,
+	.cmdreg_lrsp_crc	= MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
+	.cmdreg_srsp_crc	= MCI_CPSM_RESPONSE,
+	.cmdreg_srsp		= MCI_CPSM_RESPONSE,
+	.datalength_bits	= 16,
+	.datactrl_blocksz	= 11,
+	.pwrreg_powerup		= MCI_PWR_UP,
+	.f_max			= 100000000,
+	.mmcimask1		= true,
+	.irq_pio_mask		= MCI_IRQ_PIO_MASK,
+	.start_err		= MCI_STARTBITERR,
+	.opendrain		= MCI_ROD,
+	.init			= mmci_variant_init,
+};
+
+static struct variant_data variant_arm_extended_fifo_hwfc = {
+	.fifosize		= 128 * 4,
+	.fifohalfsize		= 64 * 4,
+	.clkreg_enable		= MCI_ARM_HWFCEN,
+	.cmdreg_cpsm_enable	= MCI_CPSM_ENABLE,
+	.cmdreg_lrsp_crc	= MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
+	.cmdreg_srsp_crc	= MCI_CPSM_RESPONSE,
+	.cmdreg_srsp		= MCI_CPSM_RESPONSE,
+	.datalength_bits	= 16,
+	.datactrl_blocksz	= 11,
+	.pwrreg_powerup		= MCI_PWR_UP,
+	.f_max			= 100000000,
+	.mmcimask1		= true,
+	.irq_pio_mask		= MCI_IRQ_PIO_MASK,
+	.start_err		= MCI_STARTBITERR,
+	.opendrain		= MCI_ROD,
+	.init			= mmci_variant_init,
+};
+
+static struct variant_data variant_u300 = {
+	.fifosize		= 16 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg_enable		= MCI_ST_U300_HWFCEN,
+	.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+	.cmdreg_cpsm_enable	= MCI_CPSM_ENABLE,
+	.cmdreg_lrsp_crc	= MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
+	.cmdreg_srsp_crc	= MCI_CPSM_RESPONSE,
+	.cmdreg_srsp		= MCI_CPSM_RESPONSE,
+	.datalength_bits	= 16,
+	.datactrl_blocksz	= 11,
+	.datactrl_mask_sdio	= MCI_DPSM_ST_SDIOEN,
+	.st_sdio			= true,
+	.pwrreg_powerup		= MCI_PWR_ON,
+	.f_max			= 100000000,
+	.signal_direction	= true,
+	.pwrreg_clkgate		= true,
+	.pwrreg_nopower		= true,
+	.mmcimask1		= true,
+	.irq_pio_mask		= MCI_IRQ_PIO_MASK,
+	.start_err		= MCI_STARTBITERR,
+	.opendrain		= MCI_OD,
+	.init			= mmci_variant_init,
+};
+
+static struct variant_data variant_nomadik = {
+	.fifosize		= 16 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg			= MCI_CLK_ENABLE,
+	.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+	.cmdreg_cpsm_enable	= MCI_CPSM_ENABLE,
+	.cmdreg_lrsp_crc	= MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
+	.cmdreg_srsp_crc	= MCI_CPSM_RESPONSE,
+	.cmdreg_srsp		= MCI_CPSM_RESPONSE,
+	.datalength_bits	= 24,
+	.datactrl_blocksz	= 11,
+	.datactrl_mask_sdio	= MCI_DPSM_ST_SDIOEN,
+	.st_sdio		= true,
+	.st_clkdiv		= true,
+	.pwrreg_powerup		= MCI_PWR_ON,
+	.f_max			= 100000000,
+	.signal_direction	= true,
+	.pwrreg_clkgate		= true,
+	.pwrreg_nopower		= true,
+	.mmcimask1		= true,
+	.irq_pio_mask		= MCI_IRQ_PIO_MASK,
+	.start_err		= MCI_STARTBITERR,
+	.opendrain		= MCI_OD,
+	.init			= mmci_variant_init,
+};
+
+static struct variant_data variant_ux500 = {
+	.fifosize		= 30 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg			= MCI_CLK_ENABLE,
+	.clkreg_enable		= MCI_ST_UX500_HWFCEN,
+	.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+	.clkreg_neg_edge_enable	= MCI_ST_UX500_NEG_EDGE,
+	.cmdreg_cpsm_enable	= MCI_CPSM_ENABLE,
+	.cmdreg_lrsp_crc	= MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
+	.cmdreg_srsp_crc	= MCI_CPSM_RESPONSE,
+	.cmdreg_srsp		= MCI_CPSM_RESPONSE,
+	.datalength_bits	= 24,
+	.datactrl_blocksz	= 11,
+	.datactrl_any_blocksz	= true,
+	.dma_power_of_2		= true,
+	.datactrl_mask_sdio	= MCI_DPSM_ST_SDIOEN,
+	.st_sdio		= true,
+	.st_clkdiv		= true,
+	.pwrreg_powerup		= MCI_PWR_ON,
+	.f_max			= 100000000,
+	.signal_direction	= true,
+	.pwrreg_clkgate		= true,
+	.busy_detect		= true,
+	.busy_dpsm_flag		= MCI_DPSM_ST_BUSYMODE,
+	.busy_detect_flag	= MCI_ST_CARDBUSY,
+	.busy_detect_mask	= MCI_ST_BUSYENDMASK,
+	.pwrreg_nopower		= true,
+	.mmcimask1		= true,
+	.irq_pio_mask		= MCI_IRQ_PIO_MASK,
+	.start_err		= MCI_STARTBITERR,
+	.opendrain		= MCI_OD,
+	.init			= ux500_variant_init,
+};
+
+static struct variant_data variant_ux500v2 = {
+	.fifosize		= 30 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg			= MCI_CLK_ENABLE,
+	.clkreg_enable		= MCI_ST_UX500_HWFCEN,
+	.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+	.clkreg_neg_edge_enable	= MCI_ST_UX500_NEG_EDGE,
+	.cmdreg_cpsm_enable	= MCI_CPSM_ENABLE,
+	.cmdreg_lrsp_crc	= MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
+	.cmdreg_srsp_crc	= MCI_CPSM_RESPONSE,
+	.cmdreg_srsp		= MCI_CPSM_RESPONSE,
+	.datactrl_mask_ddrmode	= MCI_DPSM_ST_DDRMODE,
+	.datalength_bits	= 24,
+	.datactrl_blocksz	= 11,
+	.datactrl_any_blocksz	= true,
+	.dma_power_of_2		= true,
+	.datactrl_mask_sdio	= MCI_DPSM_ST_SDIOEN,
+	.st_sdio		= true,
+	.st_clkdiv		= true,
+	.pwrreg_powerup		= MCI_PWR_ON,
+	.f_max			= 100000000,
+	.signal_direction	= true,
+	.pwrreg_clkgate		= true,
+	.busy_detect		= true,
+	.busy_dpsm_flag		= MCI_DPSM_ST_BUSYMODE,
+	.busy_detect_flag	= MCI_ST_CARDBUSY,
+	.busy_detect_mask	= MCI_ST_BUSYENDMASK,
+	.pwrreg_nopower		= true,
+	.mmcimask1		= true,
+	.irq_pio_mask		= MCI_IRQ_PIO_MASK,
+	.start_err		= MCI_STARTBITERR,
+	.opendrain		= MCI_OD,
+	.init			= ux500v2_variant_init,
+};
+
+static struct variant_data variant_stm32 = {
+	.fifosize		= 32 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg			= MCI_CLK_ENABLE,
+	.clkreg_enable		= MCI_ST_UX500_HWFCEN,
+	.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+	.clkreg_neg_edge_enable	= MCI_ST_UX500_NEG_EDGE,
+	.cmdreg_cpsm_enable	= MCI_CPSM_ENABLE,
+	.cmdreg_lrsp_crc	= MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
+	.cmdreg_srsp_crc	= MCI_CPSM_RESPONSE,
+	.cmdreg_srsp		= MCI_CPSM_RESPONSE,
+	.irq_pio_mask		= MCI_IRQ_PIO_MASK,
+	.datalength_bits	= 24,
+	.datactrl_blocksz	= 11,
+	.datactrl_mask_sdio	= MCI_DPSM_ST_SDIOEN,
+	.st_sdio		= true,
+	.st_clkdiv		= true,
+	.pwrreg_powerup		= MCI_PWR_ON,
+	.f_max			= 48000000,
+	.pwrreg_clkgate		= true,
+	.pwrreg_nopower		= true,
+	.init			= mmci_variant_init,
+};
+
+static struct variant_data variant_stm32_sdmmc = {
+	.fifosize		= 16 * 4,
+	.fifohalfsize		= 8 * 4,
+	.f_max			= 208000000,
+	.stm32_clkdiv		= true,
+	.cmdreg_cpsm_enable	= MCI_CPSM_STM32_ENABLE,
+	.cmdreg_lrsp_crc	= MCI_CPSM_STM32_LRSP_CRC,
+	.cmdreg_srsp_crc	= MCI_CPSM_STM32_SRSP_CRC,
+	.cmdreg_srsp		= MCI_CPSM_STM32_SRSP,
+	.cmdreg_stop		= MCI_CPSM_STM32_CMDSTOP,
+	.data_cmd_enable	= MCI_CPSM_STM32_CMDTRANS,
+	.irq_pio_mask		= MCI_IRQ_PIO_STM32_MASK,
+	.datactrl_first		= true,
+	.datacnt_useless	= true,
+	.datalength_bits	= 25,
+	.datactrl_blocksz	= 14,
+	.datactrl_any_blocksz	= true,
+	.datactrl_mask_sdio	= MCI_DPSM_ST_SDIOEN,
+	.stm32_idmabsize_mask	= GENMASK(12, 5),
+	.busy_timeout		= true,
+	.busy_detect		= true,
+	.busy_detect_flag	= MCI_STM32_BUSYD0,
+	.busy_detect_mask	= MCI_STM32_BUSYD0ENDMASK,
+	.init			= sdmmc_variant_init,
+};
+
+static struct variant_data variant_stm32_sdmmcv2 = {
+	.fifosize		= 16 * 4,
+	.fifohalfsize		= 8 * 4,
+	.f_max			= 208000000,
+	.stm32_clkdiv		= true,
+	.cmdreg_cpsm_enable	= MCI_CPSM_STM32_ENABLE,
+	.cmdreg_lrsp_crc	= MCI_CPSM_STM32_LRSP_CRC,
+	.cmdreg_srsp_crc	= MCI_CPSM_STM32_SRSP_CRC,
+	.cmdreg_srsp		= MCI_CPSM_STM32_SRSP,
+	.cmdreg_stop		= MCI_CPSM_STM32_CMDSTOP,
+	.data_cmd_enable	= MCI_CPSM_STM32_CMDTRANS,
+	.irq_pio_mask		= MCI_IRQ_PIO_STM32_MASK,
+	.datactrl_first		= true,
+	.datacnt_useless	= true,
+	.datalength_bits	= 25,
+	.datactrl_blocksz	= 14,
+	.datactrl_any_blocksz	= true,
+	.datactrl_mask_sdio	= MCI_DPSM_ST_SDIOEN,
+	.stm32_idmabsize_mask	= GENMASK(16, 5),
+	.dma_lli		= true,
+	.busy_timeout		= true,
+	.busy_detect		= true,
+	.busy_detect_flag	= MCI_STM32_BUSYD0,
+	.busy_detect_mask	= MCI_STM32_BUSYD0ENDMASK,
+	.init			= sdmmc_variant_init,
+};
+
+static struct variant_data variant_qcom = {
+	.fifosize		= 16 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg			= MCI_CLK_ENABLE,
+	.clkreg_enable		= MCI_QCOM_CLK_FLOWENA |
+				  MCI_QCOM_CLK_SELECT_IN_FBCLK,
+	.clkreg_8bit_bus_enable = MCI_QCOM_CLK_WIDEBUS_8,
+	.datactrl_mask_ddrmode	= MCI_QCOM_CLK_SELECT_IN_DDR_MODE,
+	.cmdreg_cpsm_enable	= MCI_CPSM_ENABLE,
+	.cmdreg_lrsp_crc	= MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
+	.cmdreg_srsp_crc	= MCI_CPSM_RESPONSE,
+	.cmdreg_srsp		= MCI_CPSM_RESPONSE,
+	.data_cmd_enable	= MCI_CPSM_QCOM_DATCMD,
+	.datalength_bits	= 24,
+	.datactrl_blocksz	= 11,
+	.datactrl_any_blocksz	= true,
+	.pwrreg_powerup		= MCI_PWR_UP,
+	.f_max			= 208000000,
+	.explicit_mclk_control	= true,
+	.qcom_fifo		= true,
+	.qcom_dml		= true,
+	.mmcimask1		= true,
+	.irq_pio_mask		= MCI_IRQ_PIO_MASK,
+	.start_err		= MCI_STARTBITERR,
+	.opendrain		= MCI_ROD,
+	.init			= qcom_variant_init,
+};
+
+/* Busy detection for the ST Micro variant */
+static int mmci_card_busy(struct mmc_host *mmc)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+	int busy = 0;
+
+	spin_lock_irqsave(&host->lock, flags);
+	if (readl(host->base + MMCISTATUS) & host->variant->busy_detect_flag)
+		busy = 1;
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	return busy;
+}
+
+static void mmci_reg_delay(struct mmci_host *host)
+{
+	/*
+	 * According to the spec, at least three feedback clock cycles
+	 * of max 52 MHz must pass between two writes to the MMCICLOCK reg.
+	 * Three MCLK clock cycles must pass between two MMCIPOWER reg writes.
+	 * Worst delay time during card init is at 100 kHz => 30 us.
+	 * Worst delay time when up and running is at 25 MHz => 120 ns.
+	 */
+	if (host->cclk < 25000000)
+		udelay(30);
+	else
+		ndelay(120);
+}
+
+/*
+ * This must be called with host->lock held
+ */
+void mmci_write_clkreg(struct mmci_host *host, u32 clk)
+{
+	if (host->clk_reg != clk) {
+		host->clk_reg = clk;
+		writel(clk, host->base + MMCICLOCK);
+	}
+}
+
+/*
+ * This must be called with host->lock held
+ */
+void mmci_write_pwrreg(struct mmci_host *host, u32 pwr)
+{
+	if (host->pwr_reg != pwr) {
+		host->pwr_reg = pwr;
+		writel(pwr, host->base + MMCIPOWER);
+	}
+}
+
+/*
+ * This must be called with host->lock held
+ */
+static void mmci_write_datactrlreg(struct mmci_host *host, u32 datactrl)
+{
+	/* Keep busy mode in DPSM if enabled */
+	datactrl |= host->datactrl_reg & host->variant->busy_dpsm_flag;
+
+	if (host->datactrl_reg != datactrl) {
+		host->datactrl_reg = datactrl;
+		writel(datactrl, host->base + MMCIDATACTRL);
+	}
+}
+
+/*
+ * This must be called with host->lock held
+ */
+static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
+{
+	struct variant_data *variant = host->variant;
+	u32 clk = variant->clkreg;
+
+	/* Make sure cclk reflects the current calculated clock */
+	host->cclk = 0;
+
+	if (desired) {
+		if (variant->explicit_mclk_control) {
+			host->cclk = host->mclk;
+		} else if (desired >= host->mclk) {
+			clk = MCI_CLK_BYPASS;
+			if (variant->st_clkdiv)
+				clk |= MCI_ST_UX500_NEG_EDGE;
+			host->cclk = host->mclk;
+		} else if (variant->st_clkdiv) {
+			/*
+			 * DB8500 TRM says f = mclk / (clkdiv + 2)
+			 * => clkdiv = (mclk / f) - 2
+			 * Round the divider up so we don't exceed the max
+			 * frequency
+			 */
+			clk = DIV_ROUND_UP(host->mclk, desired) - 2;
+			if (clk >= 256)
+				clk = 255;
+			host->cclk = host->mclk / (clk + 2);
+		} else {
+			/*
+			 * PL180 TRM says f = mclk / (2 * (clkdiv + 1))
+			 * => clkdiv = mclk / (2 * f) - 1
+			 */
+			clk = host->mclk / (2 * desired) - 1;
+			if (clk >= 256)
+				clk = 255;
+			host->cclk = host->mclk / (2 * (clk + 1));
+		}
+
+		clk |= variant->clkreg_enable;
+		clk |= MCI_CLK_ENABLE;
+		/* This hasn't proven to be worthwhile */
+		/* clk |= MCI_CLK_PWRSAVE; */
+	}
+
+	/* Set actual clock for debug */
+	host->mmc->actual_clock = host->cclk;
+
+	if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
+		clk |= MCI_4BIT_BUS;
+	if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)
+		clk |= variant->clkreg_8bit_bus_enable;
+
+	if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50 ||
+	    host->mmc->ios.timing == MMC_TIMING_MMC_DDR52)
+		clk |= variant->clkreg_neg_edge_enable;
+
+	mmci_write_clkreg(host, clk);
+}
+
+static void mmci_dma_release(struct mmci_host *host)
+{
+	if (host->ops && host->ops->dma_release)
+		host->ops->dma_release(host);
+
+	host->use_dma = false;
+}
+
+static void mmci_dma_setup(struct mmci_host *host)
+{
+	if (!host->ops || !host->ops->dma_setup)
+		return;
+
+	if (host->ops->dma_setup(host))
+		return;
+
+	/* initialize pre request cookie */
+	host->next_cookie = 1;
+
+	host->use_dma = true;
+}
+
+/*
+ * Validate mmc prerequisites
+ */
+static int mmci_validate_data(struct mmci_host *host,
+			      struct mmc_data *data)
+{
+	struct variant_data *variant = host->variant;
+
+	if (!data)
+		return 0;
+	if (!is_power_of_2(data->blksz) && !variant->datactrl_any_blocksz) {
+		dev_err(mmc_dev(host->mmc),
+			"unsupported block size (%d bytes)\n", data->blksz);
+		return -EINVAL;
+	}
+
+	if (host->ops && host->ops->validate_data)
+		return host->ops->validate_data(host, data);
+
+	return 0;
+}
+
+static int mmci_prep_data(struct mmci_host *host, struct mmc_data *data, bool next)
+{
+	int err;
+
+	if (!host->ops || !host->ops->prep_data)
+		return 0;
+
+	err = host->ops->prep_data(host, data, next);
+
+	if (next && !err)
+		data->host_cookie = ++host->next_cookie < 0 ?
+			1 : host->next_cookie;
+
+	return err;
+}
+
+static void mmci_unprep_data(struct mmci_host *host, struct mmc_data *data,
+		      int err)
+{
+	if (host->ops && host->ops->unprep_data)
+		host->ops->unprep_data(host, data, err);
+
+	data->host_cookie = 0;
+}
+
+static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
+{
+	WARN_ON(data->host_cookie && data->host_cookie != host->next_cookie);
+
+	if (host->ops && host->ops->get_next_data)
+		host->ops->get_next_data(host, data);
+}
+
+static int mmci_dma_start(struct mmci_host *host, unsigned int datactrl)
+{
+	struct mmc_data *data = host->data;
+	int ret;
+
+	if (!host->use_dma)
+		return -EINVAL;
+
+	ret = mmci_prep_data(host, data, false);
+	if (ret)
+		return ret;
+
+	if (!host->ops || !host->ops->dma_start)
+		return -EINVAL;
+
+	/* Okay, go for it. */
+	dev_vdbg(mmc_dev(host->mmc),
+		 "Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n",
+		 data->sg_len, data->blksz, data->blocks, data->flags);
+
+	ret = host->ops->dma_start(host, &datactrl);
+	if (ret)
+		return ret;
+
+	/* Trigger the DMA transfer */
+	mmci_write_datactrlreg(host, datactrl);
+
+	/*
+	 * Let the MMCI say when the data is ended and it's time
+	 * to fire next DMA request. When that happens, MMCI will
+	 * call mmci_data_end()
+	 */
+	writel(readl(host->base + MMCIMASK0) | MCI_DATAENDMASK,
+	       host->base + MMCIMASK0);
+	return 0;
+}
+
+static void mmci_dma_finalize(struct mmci_host *host, struct mmc_data *data)
+{
+	if (!host->use_dma)
+		return;
+
+	if (host->ops && host->ops->dma_finalize)
+		host->ops->dma_finalize(host, data);
+}
+
+static void mmci_dma_error(struct mmci_host *host)
+{
+	if (!host->use_dma)
+		return;
+
+	if (host->ops && host->ops->dma_error)
+		host->ops->dma_error(host);
+}
+
+static void
+mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
+{
+	writel(0, host->base + MMCICOMMAND);
+
+	BUG_ON(host->data);
+
+	host->mrq = NULL;
+	host->cmd = NULL;
+
+	mmc_request_done(host->mmc, mrq);
+}
+
+static void mmci_set_mask1(struct mmci_host *host, unsigned int mask)
+{
+	void __iomem *base = host->base;
+	struct variant_data *variant = host->variant;
+
+	if (host->singleirq) {
+		unsigned int mask0 = readl(base + MMCIMASK0);
+
+		mask0 &= ~variant->irq_pio_mask;
+		mask0 |= mask;
+
+		writel(mask0, base + MMCIMASK0);
+	}
+
+	if (variant->mmcimask1)
+		writel(mask, base + MMCIMASK1);
+
+	host->mask1_reg = mask;
+}
+
+static void mmci_stop_data(struct mmci_host *host)
+{
+	mmci_write_datactrlreg(host, 0);
+	mmci_set_mask1(host, 0);
+	host->data = NULL;
+}
+
+static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
+{
+	unsigned int flags = SG_MITER_ATOMIC;
+
+	if (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);
+}
+
+static u32 mmci_get_dctrl_cfg(struct mmci_host *host)
+{
+	return MCI_DPSM_ENABLE | mmci_dctrl_blksz(host);
+}
+
+static u32 ux500v2_get_dctrl_cfg(struct mmci_host *host)
+{
+	return MCI_DPSM_ENABLE | (host->data->blksz << 16);
+}
+
+static bool ux500_busy_complete(struct mmci_host *host, u32 status, u32 err_msk)
+{
+	void __iomem *base = host->base;
+
+	/*
+	 * Before unmasking for the busy end IRQ, confirm that the
+	 * command was sent successfully. To keep track of having a
+	 * command in-progress, waiting for busy signaling to end,
+	 * store the status in host->busy_status.
+	 *
+	 * Note that, the card may need a couple of clock cycles before
+	 * it starts signaling busy on DAT0, hence re-read the
+	 * MMCISTATUS register here, to allow the busy bit to be set.
+	 * Potentially we may even need to poll the register for a
+	 * while, to allow it to be set, but tests indicates that it
+	 * isn't needed.
+	 */
+	if (!host->busy_status && !(status & err_msk) &&
+	    (readl(base + MMCISTATUS) & host->variant->busy_detect_flag)) {
+		writel(readl(base + MMCIMASK0) |
+		       host->variant->busy_detect_mask,
+		       base + MMCIMASK0);
+
+		host->busy_status = status & (MCI_CMDSENT | MCI_CMDRESPEND);
+		return false;
+	}
+
+	/*
+	 * If there is a command in-progress that has been successfully
+	 * sent, then bail out if busy status is set and wait for the
+	 * busy end IRQ.
+	 *
+	 * Note that, the HW triggers an IRQ on both edges while
+	 * monitoring DAT0 for busy completion, but there is only one
+	 * status bit in MMCISTATUS for the busy state. Therefore
+	 * both the start and the end interrupts needs to be cleared,
+	 * one after the other. So, clear the busy start IRQ here.
+	 */
+	if (host->busy_status &&
+	    (status & host->variant->busy_detect_flag)) {
+		writel(host->variant->busy_detect_mask, base + MMCICLEAR);
+		return false;
+	}
+
+	/*
+	 * If there is a command in-progress that has been successfully
+	 * sent and the busy bit isn't set, it means we have received
+	 * the busy end IRQ. Clear and mask the IRQ, then continue to
+	 * process the command.
+	 */
+	if (host->busy_status) {
+		writel(host->variant->busy_detect_mask, base + MMCICLEAR);
+
+		writel(readl(base + MMCIMASK0) &
+		       ~host->variant->busy_detect_mask, base + MMCIMASK0);
+		host->busy_status = 0;
+	}
+
+	return true;
+}
+
+/*
+ * All the DMA operation mode stuff goes inside this ifdef.
+ * This assumes that you have a generic DMA device interface,
+ * no custom DMA interfaces are supported.
+ */
+#ifdef CONFIG_DMA_ENGINE
+struct mmci_dmae_next {
+	struct dma_async_tx_descriptor *desc;
+	struct dma_chan	*chan;
+};
+
+struct mmci_dmae_priv {
+	struct dma_chan	*cur;
+	struct dma_chan	*rx_channel;
+	struct dma_chan	*tx_channel;
+	struct dma_async_tx_descriptor	*desc_current;
+	struct mmci_dmae_next next_data;
+};
+
+int mmci_dmae_setup(struct mmci_host *host)
+{
+	const char *rxname, *txname;
+	struct mmci_dmae_priv *dmae;
+
+	dmae = devm_kzalloc(mmc_dev(host->mmc), sizeof(*dmae), GFP_KERNEL);
+	if (!dmae)
+		return -ENOMEM;
+
+	host->dma_priv = dmae;
+
+	dmae->rx_channel = dma_request_chan(mmc_dev(host->mmc), "rx");
+	if (IS_ERR(dmae->rx_channel)) {
+		int ret = PTR_ERR(dmae->rx_channel);
+		dmae->rx_channel = NULL;
+		return ret;
+	}
+
+	dmae->tx_channel = dma_request_chan(mmc_dev(host->mmc), "tx");
+	if (IS_ERR(dmae->tx_channel)) {
+		if (PTR_ERR(dmae->tx_channel) == -EPROBE_DEFER)
+			dev_warn(mmc_dev(host->mmc),
+				 "Deferred probe for TX channel ignored\n");
+		dmae->tx_channel = NULL;
+	}
+
+	/*
+	 * If only an RX channel is specified, the driver will
+	 * attempt to use it bidirectionally, however if it is
+	 * is specified but cannot be located, DMA will be disabled.
+	 */
+	if (dmae->rx_channel && !dmae->tx_channel)
+		dmae->tx_channel = dmae->rx_channel;
+
+	if (dmae->rx_channel)
+		rxname = dma_chan_name(dmae->rx_channel);
+	else
+		rxname = "none";
+
+	if (dmae->tx_channel)
+		txname = dma_chan_name(dmae->tx_channel);
+	else
+		txname = "none";
+
+	dev_info(mmc_dev(host->mmc), "DMA channels RX %s, TX %s\n",
+		 rxname, txname);
+
+	/*
+	 * Limit the maximum segment size in any SG entry according to
+	 * the parameters of the DMA engine device.
+	 */
+	if (dmae->tx_channel) {
+		struct device *dev = dmae->tx_channel->device->dev;
+		unsigned int max_seg_size = dma_get_max_seg_size(dev);
+
+		if (max_seg_size < host->mmc->max_seg_size)
+			host->mmc->max_seg_size = max_seg_size;
+	}
+	if (dmae->rx_channel) {
+		struct device *dev = dmae->rx_channel->device->dev;
+		unsigned int max_seg_size = dma_get_max_seg_size(dev);
+
+		if (max_seg_size < host->mmc->max_seg_size)
+			host->mmc->max_seg_size = max_seg_size;
+	}
+
+	if (!dmae->tx_channel || !dmae->rx_channel) {
+		mmci_dmae_release(host);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * This is used in or so inline it
+ * so it can be discarded.
+ */
+void mmci_dmae_release(struct mmci_host *host)
+{
+	struct mmci_dmae_priv *dmae = host->dma_priv;
+
+	if (dmae->rx_channel)
+		dma_release_channel(dmae->rx_channel);
+	if (dmae->tx_channel)
+		dma_release_channel(dmae->tx_channel);
+	dmae->rx_channel = dmae->tx_channel = NULL;
+}
+
+static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
+{
+	struct mmci_dmae_priv *dmae = host->dma_priv;
+	struct dma_chan *chan;
+
+	if (data->flags & MMC_DATA_READ)
+		chan = dmae->rx_channel;
+	else
+		chan = dmae->tx_channel;
+
+	dma_unmap_sg(chan->device->dev, data->sg, data->sg_len,
+		     mmc_get_dma_dir(data));
+}
+
+void mmci_dmae_error(struct mmci_host *host)
+{
+	struct mmci_dmae_priv *dmae = host->dma_priv;
+
+	if (!dma_inprogress(host))
+		return;
+
+	dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n");
+	dmaengine_terminate_all(dmae->cur);
+	host->dma_in_progress = false;
+	dmae->cur = NULL;
+	dmae->desc_current = NULL;
+	host->data->host_cookie = 0;
+
+	mmci_dma_unmap(host, host->data);
+}
+
+void mmci_dmae_finalize(struct mmci_host *host, struct mmc_data *data)
+{
+	struct mmci_dmae_priv *dmae = host->dma_priv;
+	u32 status;
+	int i;
+
+	if (!dma_inprogress(host))
+		return;
+
+	/* Wait up to 1ms for the DMA to complete */
+	for (i = 0; ; i++) {
+		status = readl(host->base + MMCISTATUS);
+		if (!(status & MCI_RXDATAAVLBLMASK) || i >= 100)
+			break;
+		udelay(10);
+	}
+
+	/*
+	 * Check to see whether we still have some data left in the FIFO -
+	 * this catches DMA controllers which are unable to monitor the
+	 * DMALBREQ and DMALSREQ signals while allowing us to DMA to non-
+	 * contiguous buffers.  On TX, we'll get a FIFO underrun error.
+	 */
+	if (status & MCI_RXDATAAVLBLMASK) {
+		mmci_dma_error(host);
+		if (!data->error)
+			data->error = -EIO;
+	} else if (!data->host_cookie) {
+		mmci_dma_unmap(host, data);
+	}
+
+	/*
+	 * Use of DMA with scatter-gather is impossible.
+	 * Give up with DMA and switch back to PIO mode.
+	 */
+	if (status & MCI_RXDATAAVLBLMASK) {
+		dev_err(mmc_dev(host->mmc), "buggy DMA detected. Taking evasive action.\n");
+		mmci_dma_release(host);
+	}
+
+	host->dma_in_progress = false;
+	dmae->cur = NULL;
+	dmae->desc_current = NULL;
+}
+
+/* prepares DMA channel and DMA descriptor, returns non-zero on failure */
+static int _mmci_dmae_prep_data(struct mmci_host *host, struct mmc_data *data,
+				struct dma_chan **dma_chan,
+				struct dma_async_tx_descriptor **dma_desc)
+{
+	struct mmci_dmae_priv *dmae = host->dma_priv;
+	struct variant_data *variant = host->variant;
+	struct dma_slave_config conf = {
+		.src_addr = host->phybase + MMCIFIFO,
+		.dst_addr = host->phybase + MMCIFIFO,
+		.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+		.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+		.src_maxburst = variant->fifohalfsize >> 2, /* # of words */
+		.dst_maxburst = variant->fifohalfsize >> 2, /* # of words */
+		.device_fc = false,
+	};
+	struct dma_chan *chan;
+	struct dma_device *device;
+	struct dma_async_tx_descriptor *desc;
+	int nr_sg;
+	unsigned long flags = DMA_CTRL_ACK;
+
+	if (data->flags & MMC_DATA_READ) {
+		conf.direction = DMA_DEV_TO_MEM;
+		chan = dmae->rx_channel;
+	} else {
+		conf.direction = DMA_MEM_TO_DEV;
+		chan = dmae->tx_channel;
+	}
+
+	/* If there's no DMA channel, fall back to PIO */
+	if (!chan)
+		return -EINVAL;
+
+	/* If less than or equal to the fifo size, don't bother with DMA */
+	if (data->blksz * data->blocks <= variant->fifosize)
+		return -EINVAL;
+
+	/*
+	 * This is necessary to get SDIO working on the Ux500. We do not yet
+	 * know if this is a bug in:
+	 * - The Ux500 DMA controller (DMA40)
+	 * - The MMCI DMA interface on the Ux500
+	 * some power of two blocks (such as 64 bytes) are sent regularly
+	 * during SDIO traffic and those work fine so for these we enable DMA
+	 * transfers.
+	 */
+	if (host->variant->dma_power_of_2 && !is_power_of_2(data->blksz))
+		return -EINVAL;
+
+	device = chan->device;
+	nr_sg = dma_map_sg(device->dev, data->sg, data->sg_len,
+			   mmc_get_dma_dir(data));
+	if (nr_sg == 0)
+		return -EINVAL;
+
+	if (host->variant->qcom_dml)
+		flags |= DMA_PREP_INTERRUPT;
+
+	dmaengine_slave_config(chan, &conf);
+	desc = dmaengine_prep_slave_sg(chan, data->sg, nr_sg,
+					    conf.direction, flags);
+	if (!desc)
+		goto unmap_exit;
+
+	*dma_chan = chan;
+	*dma_desc = desc;
+
+	return 0;
+
+ unmap_exit:
+	dma_unmap_sg(device->dev, data->sg, data->sg_len,
+		     mmc_get_dma_dir(data));
+	return -ENOMEM;
+}
+
+int mmci_dmae_prep_data(struct mmci_host *host,
+			struct mmc_data *data,
+			bool next)
+{
+	struct mmci_dmae_priv *dmae = host->dma_priv;
+	struct mmci_dmae_next *nd = &dmae->next_data;
+
+	if (!host->use_dma)
+		return -EINVAL;
+
+	if (next)
+		return _mmci_dmae_prep_data(host, data, &nd->chan, &nd->desc);
+	/* Check if next job is already prepared. */
+	if (dmae->cur && dmae->desc_current)
+		return 0;
+
+	/* No job were prepared thus do it now. */
+	return _mmci_dmae_prep_data(host, data, &dmae->cur,
+				    &dmae->desc_current);
+}
+
+int mmci_dmae_start(struct mmci_host *host, unsigned int *datactrl)
+{
+	struct mmci_dmae_priv *dmae = host->dma_priv;
+	int ret;
+
+	host->dma_in_progress = true;
+	ret = dma_submit_error(dmaengine_submit(dmae->desc_current));
+	if (ret < 0) {
+		host->dma_in_progress = false;
+		return ret;
+	}
+	dma_async_issue_pending(dmae->cur);
+
+	*datactrl |= MCI_DPSM_DMAENABLE;
+
+	return 0;
+}
+
+void mmci_dmae_get_next_data(struct mmci_host *host, struct mmc_data *data)
+{
+	struct mmci_dmae_priv *dmae = host->dma_priv;
+	struct mmci_dmae_next *next = &dmae->next_data;
+
+	if (!host->use_dma)
+		return;
+
+	WARN_ON(!data->host_cookie && (next->desc || next->chan));
+
+	dmae->desc_current = next->desc;
+	dmae->cur = next->chan;
+	next->desc = NULL;
+	next->chan = NULL;
+}
+
+void mmci_dmae_unprep_data(struct mmci_host *host,
+			   struct mmc_data *data, int err)
+
+{
+	struct mmci_dmae_priv *dmae = host->dma_priv;
+
+	if (!host->use_dma)
+		return;
+
+	mmci_dma_unmap(host, data);
+
+	if (err) {
+		struct mmci_dmae_next *next = &dmae->next_data;
+		struct dma_chan *chan;
+		if (data->flags & MMC_DATA_READ)
+			chan = dmae->rx_channel;
+		else
+			chan = dmae->tx_channel;
+		dmaengine_terminate_all(chan);
+
+		if (dmae->desc_current == next->desc)
+			dmae->desc_current = NULL;
+
+		if (dmae->cur == next->chan) {
+			host->dma_in_progress = false;
+			dmae->cur = NULL;
+		}
+
+		next->desc = NULL;
+		next->chan = NULL;
+	}
+}
+
+static struct mmci_host_ops mmci_variant_ops = {
+	.prep_data = mmci_dmae_prep_data,
+	.unprep_data = mmci_dmae_unprep_data,
+	.get_datactrl_cfg = mmci_get_dctrl_cfg,
+	.get_next_data = mmci_dmae_get_next_data,
+	.dma_setup = mmci_dmae_setup,
+	.dma_release = mmci_dmae_release,
+	.dma_start = mmci_dmae_start,
+	.dma_finalize = mmci_dmae_finalize,
+	.dma_error = mmci_dmae_error,
+};
+#else
+static struct mmci_host_ops mmci_variant_ops = {
+	.get_datactrl_cfg = mmci_get_dctrl_cfg,
+};
+#endif
+
+static void mmci_variant_init(struct mmci_host *host)
+{
+	host->ops = &mmci_variant_ops;
+}
+
+static void ux500_variant_init(struct mmci_host *host)
+{
+	host->ops = &mmci_variant_ops;
+	host->ops->busy_complete = ux500_busy_complete;
+}
+
+static void ux500v2_variant_init(struct mmci_host *host)
+{
+	host->ops = &mmci_variant_ops;
+	host->ops->busy_complete = ux500_busy_complete;
+	host->ops->get_datactrl_cfg = ux500v2_get_dctrl_cfg;
+}
+
+static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	struct mmc_data *data = mrq->data;
+
+	if (!data)
+		return;
+
+	WARN_ON(data->host_cookie);
+
+	if (mmci_validate_data(host, data))
+		return;
+
+	mmci_prep_data(host, data, true);
+}
+
+static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq,
+			      int err)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	struct mmc_data *data = mrq->data;
+
+	if (!data || !data->host_cookie)
+		return;
+
+	mmci_unprep_data(host, data, err);
+}
+
+static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
+{
+	struct variant_data *variant = host->variant;
+	unsigned int datactrl, timeout, irqmask;
+	unsigned long long clks;
+	void __iomem *base;
+
+	dev_dbg(mmc_dev(host->mmc), "blksz %04x blks %04x flags %08x\n",
+		data->blksz, data->blocks, data->flags);
+
+	host->data = data;
+	host->size = data->blksz * data->blocks;
+	data->bytes_xfered = 0;
+
+	clks = (unsigned long long)data->timeout_ns * host->cclk;
+	do_div(clks, NSEC_PER_SEC);
+
+	timeout = data->timeout_clks + (unsigned int)clks;
+
+	base = host->base;
+	writel(timeout, base + MMCIDATATIMER);
+	writel(host->size, base + MMCIDATALENGTH);
+
+	datactrl = host->ops->get_datactrl_cfg(host);
+	datactrl |= host->data->flags & MMC_DATA_READ ? MCI_DPSM_DIRECTION : 0;
+
+	if (host->mmc->card && mmc_card_sdio(host->mmc->card)) {
+		u32 clk;
+
+		datactrl |= variant->datactrl_mask_sdio;
+
+		/*
+		 * The ST Micro variant for SDIO small write transfers
+		 * needs to have clock H/W flow control disabled,
+		 * otherwise the transfer will not start. The threshold
+		 * depends on the rate of MCLK.
+		 */
+		if (variant->st_sdio && data->flags & MMC_DATA_WRITE &&
+		    (host->size < 8 ||
+		     (host->size <= 8 && host->mclk > 50000000)))
+			clk = host->clk_reg & ~variant->clkreg_enable;
+		else
+			clk = host->clk_reg | variant->clkreg_enable;
+
+		mmci_write_clkreg(host, clk);
+	}
+
+	if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50 ||
+	    host->mmc->ios.timing == MMC_TIMING_MMC_DDR52)
+		datactrl |= variant->datactrl_mask_ddrmode;
+
+	/*
+	 * Attempt to use DMA operation mode, if this
+	 * should fail, fall back to PIO mode
+	 */
+	if (!mmci_dma_start(host, datactrl))
+		return;
+
+	/* IRQ mode, map the SG list for CPU reading/writing */
+	mmci_init_sg(host, data);
+
+	if (data->flags & MMC_DATA_READ) {
+		irqmask = MCI_RXFIFOHALFFULLMASK;
+
+		/*
+		 * If we have less than the fifo 'half-full' threshold to
+		 * transfer, trigger a PIO interrupt as soon as any data
+		 * is available.
+		 */
+		if (host->size < variant->fifohalfsize)
+			irqmask |= MCI_RXDATAAVLBLMASK;
+	} else {
+		/*
+		 * We don't actually need to include "FIFO empty" here
+		 * since its implicit in "FIFO half empty".
+		 */
+		irqmask = MCI_TXFIFOHALFEMPTYMASK;
+	}
+
+	mmci_write_datactrlreg(host, datactrl);
+	writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
+	mmci_set_mask1(host, irqmask);
+}
+
+static void
+mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
+{
+	void __iomem *base = host->base;
+	unsigned long long clks;
+
+	dev_dbg(mmc_dev(host->mmc), "op %02x arg %08x flags %08x\n",
+	    cmd->opcode, cmd->arg, cmd->flags);
+
+	if (readl(base + MMCICOMMAND) & host->variant->cmdreg_cpsm_enable) {
+		writel(0, base + MMCICOMMAND);
+		mmci_reg_delay(host);
+	}
+
+	if (host->variant->cmdreg_stop &&
+	    cmd->opcode == MMC_STOP_TRANSMISSION)
+		c |= host->variant->cmdreg_stop;
+
+	c |= cmd->opcode | host->variant->cmdreg_cpsm_enable;
+	if (cmd->flags & MMC_RSP_PRESENT) {
+		if (cmd->flags & MMC_RSP_136)
+			c |= host->variant->cmdreg_lrsp_crc;
+		else if (cmd->flags & MMC_RSP_CRC)
+			c |= host->variant->cmdreg_srsp_crc;
+		else
+			c |= host->variant->cmdreg_srsp;
+	}
+
+	if (host->variant->busy_timeout && cmd->flags & MMC_RSP_BUSY) {
+		if (!cmd->busy_timeout)
+			cmd->busy_timeout = 10 * MSEC_PER_SEC;
+
+		if (cmd->busy_timeout > host->mmc->max_busy_timeout)
+			clks = (unsigned long long)host->mmc->max_busy_timeout * host->cclk;
+		else
+			clks = (unsigned long long)cmd->busy_timeout * host->cclk;
+
+		do_div(clks, MSEC_PER_SEC);
+		writel_relaxed(clks, host->base + MMCIDATATIMER);
+	}
+
+	if (host->ops->pre_sig_volt_switch && cmd->opcode == SD_SWITCH_VOLTAGE)
+		host->ops->pre_sig_volt_switch(host);
+
+	if (/*interrupt*/0)
+		c |= MCI_CPSM_INTERRUPT;
+
+	if (mmc_cmd_type(cmd) == MMC_CMD_ADTC)
+		c |= host->variant->data_cmd_enable;
+
+	host->cmd = cmd;
+
+	writel(cmd->arg, base + MMCIARGUMENT);
+	writel(c, base + MMCICOMMAND);
+}
+
+static void mmci_stop_command(struct mmci_host *host)
+{
+	host->stop_abort.error = 0;
+	mmci_start_command(host, &host->stop_abort, 0);
+}
+
+static void
+mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
+	      unsigned int status)
+{
+	unsigned int status_err;
+
+	/* Make sure we have data to handle */
+	if (!data)
+		return;
+
+	/* First check for errors */
+	status_err = status & (host->variant->start_err |
+			       MCI_DATACRCFAIL | MCI_DATATIMEOUT |
+			       MCI_TXUNDERRUN | MCI_RXOVERRUN);
+
+	if (status_err) {
+		u32 remain, success;
+
+		/* Terminate the DMA transfer */
+		mmci_dma_error(host);
+
+		/*
+		 * Calculate how far we are into the transfer.  Note that
+		 * the data counter gives the number of bytes transferred
+		 * on the MMC bus, not on the host side.  On reads, this
+		 * can be as much as a FIFO-worth of data ahead.  This
+		 * matters for FIFO overruns only.
+		 */
+		if (!host->variant->datacnt_useless) {
+			remain = readl(host->base + MMCIDATACNT);
+			success = data->blksz * data->blocks - remain;
+		} else {
+			success = 0;
+		}
+
+		dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ, status 0x%08x at 0x%08x\n",
+			status_err, success);
+		if (status_err & MCI_DATACRCFAIL) {
+			/* Last block was not successful */
+			success -= 1;
+			data->error = -EILSEQ;
+		} else if (status_err & MCI_DATATIMEOUT) {
+			data->error = -ETIMEDOUT;
+		} else if (status_err & MCI_STARTBITERR) {
+			data->error = -ECOMM;
+		} else if (status_err & MCI_TXUNDERRUN) {
+			data->error = -EIO;
+		} else if (status_err & MCI_RXOVERRUN) {
+			if (success > host->variant->fifosize)
+				success -= host->variant->fifosize;
+			else
+				success = 0;
+			data->error = -EIO;
+		}
+		data->bytes_xfered = round_down(success, data->blksz);
+	}
+
+	if (status & MCI_DATABLOCKEND)
+		dev_err(mmc_dev(host->mmc), "stray MCI_DATABLOCKEND interrupt\n");
+
+	if (status & MCI_DATAEND || data->error) {
+		mmci_dma_finalize(host, data);
+
+		mmci_stop_data(host);
+
+		if (!data->error)
+			/* The error clause is handled above, success! */
+			data->bytes_xfered = data->blksz * data->blocks;
+
+		if (!data->stop) {
+			if (host->variant->cmdreg_stop && data->error)
+				mmci_stop_command(host);
+			else
+				mmci_request_end(host, data->mrq);
+		} else if (host->mrq->sbc && !data->error) {
+			mmci_request_end(host, data->mrq);
+		} else {
+			mmci_start_command(host, data->stop, 0);
+		}
+	}
+}
+
+static void
+mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
+	     unsigned int status)
+{
+	u32 err_msk = MCI_CMDCRCFAIL | MCI_CMDTIMEOUT;
+	void __iomem *base = host->base;
+	bool sbc, busy_resp;
+
+	if (!cmd)
+		return;
+
+	sbc = (cmd == host->mrq->sbc);
+	busy_resp = !!(cmd->flags & MMC_RSP_BUSY);
+
+	/*
+	 * We need to be one of these interrupts to be considered worth
+	 * handling. Note that we tag on any latent IRQs postponed
+	 * due to waiting for busy status.
+	 */
+	if (host->variant->busy_timeout && busy_resp)
+		err_msk |= MCI_DATATIMEOUT;
+
+	if (!((status | host->busy_status) &
+	      (err_msk | MCI_CMDSENT | MCI_CMDRESPEND)))
+		return;
+
+	/* Handle busy detection on DAT0 if the variant supports it. */
+	if (busy_resp && host->variant->busy_detect)
+		if (!host->ops->busy_complete(host, status, err_msk))
+			return;
+
+	host->cmd = NULL;
+
+	if (status & MCI_CMDTIMEOUT) {
+		cmd->error = -ETIMEDOUT;
+	} else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
+		cmd->error = -EILSEQ;
+	} else if (host->variant->busy_timeout && busy_resp &&
+		   status & MCI_DATATIMEOUT) {
+		cmd->error = -ETIMEDOUT;
+		host->irq_action = IRQ_WAKE_THREAD;
+	} else {
+		cmd->resp[0] = readl(base + MMCIRESPONSE0);
+		cmd->resp[1] = readl(base + MMCIRESPONSE1);
+		cmd->resp[2] = readl(base + MMCIRESPONSE2);
+		cmd->resp[3] = readl(base + MMCIRESPONSE3);
+	}
+
+	if ((!sbc && !cmd->data) || cmd->error) {
+		if (host->data) {
+			/* Terminate the DMA transfer */
+			mmci_dma_error(host);
+
+			mmci_stop_data(host);
+			if (host->variant->cmdreg_stop && cmd->error) {
+				mmci_stop_command(host);
+				return;
+			}
+		}
+
+		if (host->irq_action != IRQ_WAKE_THREAD)
+			mmci_request_end(host, host->mrq);
+
+	} else if (sbc) {
+		mmci_start_command(host, host->mrq->cmd, 0);
+	} else if (!host->variant->datactrl_first &&
+		   !(cmd->data->flags & MMC_DATA_READ)) {
+		mmci_start_data(host, cmd->data);
+	}
+}
+
+static int mmci_get_rx_fifocnt(struct mmci_host *host, u32 status, int remain)
+{
+	return remain - (readl(host->base + MMCIFIFOCNT) << 2);
+}
+
+static int mmci_qcom_get_rx_fifocnt(struct mmci_host *host, u32 status, int r)
+{
+	/*
+	 * on qcom SDCC4 only 8 words are used in each burst so only 8 addresses
+	 * from the fifo range should be used
+	 */
+	if (status & MCI_RXFIFOHALFFULL)
+		return host->variant->fifohalfsize;
+	else if (status & MCI_RXDATAAVLBL)
+		return 4;
+
+	return 0;
+}
+
+static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
+{
+	void __iomem *base = host->base;
+	char *ptr = buffer;
+	u32 status = readl(host->base + MMCISTATUS);
+	int host_remain = host->size;
+
+	do {
+		int count = host->get_rx_fifocnt(host, status, host_remain);
+
+		if (count > remain)
+			count = remain;
+
+		if (count <= 0)
+			break;
+
+		/*
+		 * SDIO especially may want to send something that is
+		 * not divisible by 4 (as opposed to card sectors
+		 * etc). Therefore make sure to always read the last bytes
+		 * while only doing full 32-bit reads towards the FIFO.
+		 */
+		if (unlikely(count & 0x3)) {
+			if (count < 4) {
+				unsigned char buf[4];
+				ioread32_rep(base + MMCIFIFO, buf, 1);
+				memcpy(ptr, buf, count);
+			} else {
+				ioread32_rep(base + MMCIFIFO, ptr, count >> 2);
+				count &= ~0x3;
+			}
+		} else {
+			ioread32_rep(base + MMCIFIFO, ptr, count >> 2);
+		}
+
+		ptr += count;
+		remain -= count;
+		host_remain -= count;
+
+		if (remain == 0)
+			break;
+
+		status = readl(base + MMCISTATUS);
+	} while (status & MCI_RXDATAAVLBL);
+
+	return ptr - buffer;
+}
+
+static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
+{
+	struct variant_data *variant = host->variant;
+	void __iomem *base = host->base;
+	char *ptr = buffer;
+
+	do {
+		unsigned int count, maxcnt;
+
+		maxcnt = status & MCI_TXFIFOEMPTY ?
+			 variant->fifosize : variant->fifohalfsize;
+		count = min(remain, maxcnt);
+
+		/*
+		 * SDIO especially may want to send something that is
+		 * not divisible by 4 (as opposed to card sectors
+		 * etc), and the FIFO only accept full 32-bit writes.
+		 * So compensate by adding +3 on the count, a single
+		 * byte become a 32bit write, 7 bytes will be two
+		 * 32bit writes etc.
+		 */
+		iowrite32_rep(base + MMCIFIFO, ptr, (count + 3) >> 2);
+
+		ptr += count;
+		remain -= count;
+
+		if (remain == 0)
+			break;
+
+		status = readl(base + MMCISTATUS);
+	} while (status & MCI_TXFIFOHALFEMPTY);
+
+	return ptr - buffer;
+}
+
+/*
+ * PIO data transfer IRQ handler.
+ */
+static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
+{
+	struct mmci_host *host = dev_id;
+	struct sg_mapping_iter *sg_miter = &host->sg_miter;
+	struct variant_data *variant = host->variant;
+	void __iomem *base = host->base;
+	u32 status;
+
+	status = readl(base + MMCISTATUS);
+
+	dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status);
+
+	do {
+		unsigned int remain, len;
+		char *buffer;
+
+		/*
+		 * For write, we only need to test the half-empty flag
+		 * here - if the FIFO is completely empty, then by
+		 * definition it is more than half empty.
+		 *
+		 * For read, check for data available.
+		 */
+		if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
+			break;
+
+		if (!sg_miter_next(sg_miter))
+			break;
+
+		buffer = sg_miter->addr;
+		remain = sg_miter->length;
+
+		len = 0;
+		if (status & MCI_RXACTIVE)
+			len = mmci_pio_read(host, buffer, remain);
+		if (status & MCI_TXACTIVE)
+			len = mmci_pio_write(host, buffer, remain, status);
+
+		sg_miter->consumed = len;
+
+		host->size -= len;
+		remain -= len;
+
+		if (remain)
+			break;
+
+		status = readl(base + MMCISTATUS);
+	} while (1);
+
+	sg_miter_stop(sg_miter);
+
+	/*
+	 * If we have less than the fifo 'half-full' threshold to transfer,
+	 * trigger a PIO interrupt as soon as any data is available.
+	 */
+	if (status & MCI_RXACTIVE && host->size < variant->fifohalfsize)
+		mmci_set_mask1(host, MCI_RXDATAAVLBLMASK);
+
+	/*
+	 * If we run out of data, disable the data IRQs; this
+	 * prevents a race where the FIFO becomes empty before
+	 * the chip itself has disabled the data path, and
+	 * stops us racing with our data end IRQ.
+	 */
+	if (host->size == 0) {
+		mmci_set_mask1(host, 0);
+		writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * Handle completion of command and data transfers.
+ */
+static irqreturn_t mmci_irq(int irq, void *dev_id)
+{
+	struct mmci_host *host = dev_id;
+	u32 status;
+
+	spin_lock(&host->lock);
+	host->irq_action = IRQ_HANDLED;
+
+	do {
+		status = readl(host->base + MMCISTATUS);
+
+		if (host->singleirq) {
+			if (status & host->mask1_reg)
+				mmci_pio_irq(irq, dev_id);
+
+			status &= ~host->variant->irq_pio_mask;
+		}
+
+		/*
+		 * Busy detection is managed by mmci_cmd_irq(), including to
+		 * clear the corresponding IRQ.
+		 */
+		status &= readl(host->base + MMCIMASK0);
+		if (host->variant->busy_detect)
+			writel(status & ~host->variant->busy_detect_mask,
+			       host->base + MMCICLEAR);
+		else
+			writel(status, host->base + MMCICLEAR);
+
+		dev_dbg(mmc_dev(host->mmc), "irq0 (data+cmd) %08x\n", status);
+
+		if (host->variant->reversed_irq_handling) {
+			mmci_data_irq(host, host->data, status);
+			mmci_cmd_irq(host, host->cmd, status);
+		} else {
+			mmci_cmd_irq(host, host->cmd, status);
+			mmci_data_irq(host, host->data, status);
+		}
+
+		/*
+		 * Busy detection has been handled by mmci_cmd_irq() above.
+		 * Clear the status bit to prevent polling in IRQ context.
+		 */
+		if (host->variant->busy_detect_flag)
+			status &= ~host->variant->busy_detect_flag;
+
+	} while (status);
+
+	spin_unlock(&host->lock);
+
+	return host->irq_action;
+}
+
+/*
+ * mmci_irq_thread() - A threaded IRQ handler that manages a reset of the HW.
+ *
+ * A reset is needed for some variants, where a datatimeout for a R1B request
+ * causes the DPSM to stay busy (non-functional).
+ */
+static irqreturn_t mmci_irq_thread(int irq, void *dev_id)
+{
+	struct mmci_host *host = dev_id;
+	unsigned long flags;
+
+	if (host->rst) {
+		reset_control_assert(host->rst);
+		udelay(2);
+		reset_control_deassert(host->rst);
+	}
+
+	spin_lock_irqsave(&host->lock, flags);
+	writel(host->clk_reg, host->base + MMCICLOCK);
+	writel(host->pwr_reg, host->base + MMCIPOWER);
+	writel(MCI_IRQENABLE | host->variant->start_err,
+	       host->base + MMCIMASK0);
+
+	host->irq_action = IRQ_HANDLED;
+	mmci_request_end(host, host->mrq);
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	return host->irq_action;
+}
+
+static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+
+	WARN_ON(host->mrq != NULL);
+
+	mrq->cmd->error = mmci_validate_data(host, mrq->data);
+	if (mrq->cmd->error) {
+		mmc_request_done(mmc, mrq);
+		return;
+	}
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	host->mrq = mrq;
+
+	if (mrq->data)
+		mmci_get_next_data(host, mrq->data);
+
+	if (mrq->data &&
+	    (host->variant->datactrl_first || mrq->data->flags & MMC_DATA_READ))
+		mmci_start_data(host, mrq->data);
+
+	if (mrq->sbc)
+		mmci_start_command(host, mrq->sbc, 0);
+	else
+		mmci_start_command(host, mrq->cmd, 0);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void mmci_set_max_busy_timeout(struct mmc_host *mmc)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	u32 max_busy_timeout = 0;
+
+	if (!host->variant->busy_detect)
+		return;
+
+	if (host->variant->busy_timeout && mmc->actual_clock)
+		max_busy_timeout = U32_MAX / DIV_ROUND_UP(mmc->actual_clock,
+							  MSEC_PER_SEC);
+
+	mmc->max_busy_timeout = max_busy_timeout;
+}
+
+static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	struct variant_data *variant = host->variant;
+	u32 pwr = 0;
+	unsigned long flags;
+	int ret;
+
+	if (host->plat->ios_handler &&
+		host->plat->ios_handler(mmc_dev(mmc), ios))
+			dev_err(mmc_dev(mmc), "platform ios_handler failed\n");
+
+	switch (ios->power_mode) {
+	case MMC_POWER_OFF:
+		if (!IS_ERR(mmc->supply.vmmc))
+			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
+
+		if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) {
+			regulator_disable(mmc->supply.vqmmc);
+			host->vqmmc_enabled = false;
+		}
+
+		break;
+	case MMC_POWER_UP:
+		if (!IS_ERR(mmc->supply.vmmc))
+			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
+
+		/*
+		 * The ST Micro variant doesn't have the PL180s MCI_PWR_UP
+		 * and instead uses MCI_PWR_ON so apply whatever value is
+		 * configured in the variant data.
+		 */
+		pwr |= variant->pwrreg_powerup;
+
+		break;
+	case MMC_POWER_ON:
+		if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
+			ret = regulator_enable(mmc->supply.vqmmc);
+			if (ret < 0)
+				dev_err(mmc_dev(mmc),
+					"failed to enable vqmmc regulator\n");
+			else
+				host->vqmmc_enabled = true;
+		}
+
+		pwr |= MCI_PWR_ON;
+		break;
+	}
+
+	if (variant->signal_direction && ios->power_mode != MMC_POWER_OFF) {
+		/*
+		 * The ST Micro variant has some additional bits
+		 * indicating signal direction for the signals in
+		 * the SD/MMC bus and feedback-clock usage.
+		 */
+		pwr |= host->pwr_reg_add;
+
+		if (ios->bus_width == MMC_BUS_WIDTH_4)
+			pwr &= ~MCI_ST_DATA74DIREN;
+		else if (ios->bus_width == MMC_BUS_WIDTH_1)
+			pwr &= (~MCI_ST_DATA74DIREN &
+				~MCI_ST_DATA31DIREN &
+				~MCI_ST_DATA2DIREN);
+	}
+
+	if (variant->opendrain) {
+		if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
+			pwr |= variant->opendrain;
+	} else {
+		/*
+		 * If the variant cannot configure the pads by its own, then we
+		 * expect the pinctrl to be able to do that for us
+		 */
+		if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
+			pinctrl_select_state(host->pinctrl, host->pins_opendrain);
+		else
+			pinctrl_select_default_state(mmc_dev(mmc));
+	}
+
+	/*
+	 * If clock = 0 and the variant requires the MMCIPOWER to be used for
+	 * gating the clock, the MCI_PWR_ON bit is cleared.
+	 */
+	if (!ios->clock && variant->pwrreg_clkgate)
+		pwr &= ~MCI_PWR_ON;
+
+	if (host->variant->explicit_mclk_control &&
+	    ios->clock != host->clock_cache) {
+		ret = clk_set_rate(host->clk, ios->clock);
+		if (ret < 0)
+			dev_err(mmc_dev(host->mmc),
+				"Error setting clock rate (%d)\n", ret);
+		else
+			host->mclk = clk_get_rate(host->clk);
+	}
+	host->clock_cache = ios->clock;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	if (host->ops && host->ops->set_clkreg)
+		host->ops->set_clkreg(host, ios->clock);
+	else
+		mmci_set_clkreg(host, ios->clock);
+
+	mmci_set_max_busy_timeout(mmc);
+
+	if (host->ops && host->ops->set_pwrreg)
+		host->ops->set_pwrreg(host, pwr);
+	else
+		mmci_write_pwrreg(host, pwr);
+
+	mmci_reg_delay(host);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static int mmci_get_cd(struct mmc_host *mmc)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	struct mmci_platform_data *plat = host->plat;
+	unsigned int status = mmc_gpio_get_cd(mmc);
+
+	if (status == -ENOSYS) {
+		if (!plat->status)
+			return 1; /* Assume always present */
+
+		status = plat->status(mmc_dev(host->mmc));
+	}
+	return status;
+}
+
+static int mmci_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	int ret;
+
+	ret = mmc_regulator_set_vqmmc(mmc, ios);
+
+	if (!ret && host->ops && host->ops->post_sig_volt_switch)
+		ret = host->ops->post_sig_volt_switch(host, ios);
+	else if (ret)
+		ret = 0;
+
+	if (ret < 0)
+		dev_warn(mmc_dev(mmc), "Voltage switch failed\n");
+
+	return ret;
+}
+
+static struct mmc_host_ops mmci_ops = {
+	.request	= mmci_request,
+	.pre_req	= mmci_pre_request,
+	.post_req	= mmci_post_request,
+	.set_ios	= mmci_set_ios,
+	.get_ro		= mmc_gpio_get_ro,
+	.get_cd		= mmci_get_cd,
+	.start_signal_voltage_switch = mmci_sig_volt_switch,
+};
+
+static int mmci_of_parse(struct device_node *np, struct mmc_host *mmc)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	int ret = mmc_of_parse(mmc);
+
+	if (ret)
+		return ret;
+
+	if (of_get_property(np, "st,sig-dir-dat0", NULL))
+		host->pwr_reg_add |= MCI_ST_DATA0DIREN;
+	if (of_get_property(np, "st,sig-dir-dat2", NULL))
+		host->pwr_reg_add |= MCI_ST_DATA2DIREN;
+	if (of_get_property(np, "st,sig-dir-dat31", NULL))
+		host->pwr_reg_add |= MCI_ST_DATA31DIREN;
+	if (of_get_property(np, "st,sig-dir-dat74", NULL))
+		host->pwr_reg_add |= MCI_ST_DATA74DIREN;
+	if (of_get_property(np, "st,sig-dir-cmd", NULL))
+		host->pwr_reg_add |= MCI_ST_CMDDIREN;
+	if (of_get_property(np, "st,sig-pin-fbclk", NULL))
+		host->pwr_reg_add |= MCI_ST_FBCLKEN;
+	if (of_get_property(np, "st,sig-dir", NULL))
+		host->pwr_reg_add |= MCI_STM32_DIRPOL;
+	if (of_get_property(np, "st,neg-edge", NULL))
+		host->clk_reg_add |= MCI_STM32_CLK_NEGEDGE;
+	if (of_get_property(np, "st,use-ckin", NULL))
+		host->clk_reg_add |= MCI_STM32_CLK_SELCKIN;
+
+	if (of_get_property(np, "mmc-cap-mmc-highspeed", NULL))
+		mmc->caps |= MMC_CAP_MMC_HIGHSPEED;
+	if (of_get_property(np, "mmc-cap-sd-highspeed", NULL))
+		mmc->caps |= MMC_CAP_SD_HIGHSPEED;
+
+	return 0;
+}
+
+static int mmci_probe(struct amba_device *dev,
+	const struct amba_id *id)
+{
+	struct mmci_platform_data *plat = dev->dev.platform_data;
+	struct device_node *np = dev->dev.of_node;
+	struct variant_data *variant = id->data;
+	struct mmci_host *host;
+	struct mmc_host *mmc;
+	int ret;
+
+	/* Must have platform data or Device Tree. */
+	if (!plat && !np) {
+		dev_err(&dev->dev, "No plat data or DT found\n");
+		return -EINVAL;
+	}
+
+	if (!plat) {
+		plat = devm_kzalloc(&dev->dev, sizeof(*plat), GFP_KERNEL);
+		if (!plat)
+			return -ENOMEM;
+	}
+
+	mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
+	if (!mmc)
+		return -ENOMEM;
+
+	ret = mmci_of_parse(np, mmc);
+	if (ret)
+		goto host_free;
+
+	host = mmc_priv(mmc);
+	host->mmc = mmc;
+	host->mmc_ops = &mmci_ops;
+	mmc->ops = &mmci_ops;
+
+	/*
+	 * Some variant (STM32) doesn't have opendrain bit, nevertheless
+	 * pins can be set accordingly using pinctrl
+	 */
+	if (!variant->opendrain) {
+		host->pinctrl = devm_pinctrl_get(&dev->dev);
+		if (IS_ERR(host->pinctrl)) {
+			dev_err(&dev->dev, "failed to get pinctrl");
+			ret = PTR_ERR(host->pinctrl);
+			goto host_free;
+		}
+
+		host->pins_opendrain = pinctrl_lookup_state(host->pinctrl,
+							    MMCI_PINCTRL_STATE_OPENDRAIN);
+		if (IS_ERR(host->pins_opendrain)) {
+			dev_err(mmc_dev(mmc), "Can't select opendrain pins\n");
+			ret = PTR_ERR(host->pins_opendrain);
+			goto host_free;
+		}
+	}
+
+	host->hw_designer = amba_manf(dev);
+	host->hw_revision = amba_rev(dev);
+	dev_dbg(mmc_dev(mmc), "designer ID = 0x%02x\n", host->hw_designer);
+	dev_dbg(mmc_dev(mmc), "revision = 0x%01x\n", host->hw_revision);
+
+	host->clk = devm_clk_get(&dev->dev, NULL);
+	if (IS_ERR(host->clk)) {
+		ret = PTR_ERR(host->clk);
+		goto host_free;
+	}
+
+	ret = clk_prepare_enable(host->clk);
+	if (ret)
+		goto host_free;
+
+	if (variant->qcom_fifo)
+		host->get_rx_fifocnt = mmci_qcom_get_rx_fifocnt;
+	else
+		host->get_rx_fifocnt = mmci_get_rx_fifocnt;
+
+	host->plat = plat;
+	host->variant = variant;
+	host->mclk = clk_get_rate(host->clk);
+	/*
+	 * According to the spec, mclk is max 100 MHz,
+	 * so we try to adjust the clock down to this,
+	 * (if possible).
+	 */
+	if (host->mclk > variant->f_max) {
+		ret = clk_set_rate(host->clk, variant->f_max);
+		if (ret < 0)
+			goto clk_disable;
+		host->mclk = clk_get_rate(host->clk);
+		dev_dbg(mmc_dev(mmc), "eventual mclk rate: %u Hz\n",
+			host->mclk);
+	}
+
+	host->phybase = dev->res.start;
+	host->base = devm_ioremap_resource(&dev->dev, &dev->res);
+	if (IS_ERR(host->base)) {
+		ret = PTR_ERR(host->base);
+		goto clk_disable;
+	}
+
+	if (variant->init)
+		variant->init(host);
+
+	/*
+	 * The ARM and ST versions of the block have slightly different
+	 * clock divider equations which means that the minimum divider
+	 * differs too.
+	 * on Qualcomm like controllers get the nearest minimum clock to 100Khz
+	 */
+	if (variant->st_clkdiv)
+		mmc->f_min = DIV_ROUND_UP(host->mclk, 257);
+	else if (variant->stm32_clkdiv)
+		mmc->f_min = DIV_ROUND_UP(host->mclk, 2046);
+	else if (variant->explicit_mclk_control)
+		mmc->f_min = clk_round_rate(host->clk, 100000);
+	else
+		mmc->f_min = DIV_ROUND_UP(host->mclk, 512);
+	/*
+	 * If no maximum operating frequency is supplied, fall back to use
+	 * the module parameter, which has a (low) default value in case it
+	 * is not specified. Either value must not exceed the clock rate into
+	 * the block, of course.
+	 */
+	if (mmc->f_max)
+		mmc->f_max = variant->explicit_mclk_control ?
+				min(variant->f_max, mmc->f_max) :
+				min(host->mclk, mmc->f_max);
+	else
+		mmc->f_max = variant->explicit_mclk_control ?
+				fmax : min(host->mclk, fmax);
+
+
+	dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max);
+
+	host->rst = devm_reset_control_get_optional_exclusive(&dev->dev, NULL);
+	if (IS_ERR(host->rst)) {
+		ret = PTR_ERR(host->rst);
+		goto clk_disable;
+	}
+
+	/* Get regulators and the supported OCR mask */
+	ret = mmc_regulator_get_supply(mmc);
+	if (ret)
+		goto clk_disable;
+
+	if (!mmc->ocr_avail)
+		mmc->ocr_avail = plat->ocr_mask;
+	else if (plat->ocr_mask)
+		dev_warn(mmc_dev(mmc), "Platform OCR mask is ignored\n");
+
+	/* We support these capabilities. */
+	mmc->caps |= MMC_CAP_CMD23;
+
+	/*
+	 * Enable busy detection.
+	 */
+	if (variant->busy_detect) {
+		mmci_ops.card_busy = mmci_card_busy;
+		/*
+		 * Not all variants have a flag to enable busy detection
+		 * in the DPSM, but if they do, set it here.
+		 */
+		if (variant->busy_dpsm_flag)
+			mmci_write_datactrlreg(host,
+					       host->variant->busy_dpsm_flag);
+		mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
+	}
+
+	/* Variants with mandatory busy timeout in HW needs R1B responses. */
+	if (variant->busy_timeout)
+		mmc->caps |= MMC_CAP_NEED_RSP_BUSY;
+
+	/* Prepare a CMD12 - needed to clear the DPSM on some variants. */
+	host->stop_abort.opcode = MMC_STOP_TRANSMISSION;
+	host->stop_abort.arg = 0;
+	host->stop_abort.flags = MMC_RSP_R1B | MMC_CMD_AC;
+
+	/* We support these PM capabilities. */
+	mmc->pm_caps |= MMC_PM_KEEP_POWER;
+
+	/*
+	 * We can do SGIO
+	 */
+	mmc->max_segs = NR_SG;
+
+	/*
+	 * Since only a certain number of bits are valid in the data length
+	 * register, we must ensure that we don't exceed 2^num-1 bytes in a
+	 * single request.
+	 */
+	mmc->max_req_size = (1 << variant->datalength_bits) - 1;
+
+	/*
+	 * Set the maximum segment size.  Since we aren't doing DMA
+	 * (yet) we are only limited by the data length register.
+	 */
+	mmc->max_seg_size = mmc->max_req_size;
+
+	/*
+	 * Block size can be up to 2048 bytes, but must be a power of two.
+	 */
+	mmc->max_blk_size = 1 << variant->datactrl_blocksz;
+
+	/*
+	 * Limit the number of blocks transferred so that we don't overflow
+	 * the maximum request size.
+	 */
+	mmc->max_blk_count = mmc->max_req_size >> variant->datactrl_blocksz;
+
+	spin_lock_init(&host->lock);
+
+	writel(0, host->base + MMCIMASK0);
+
+	if (variant->mmcimask1)
+		writel(0, host->base + MMCIMASK1);
+
+	writel(0xfff, host->base + MMCICLEAR);
+
+	/*
+	 * If:
+	 * - not using DT but using a descriptor table, or
+	 * - using a table of descriptors ALONGSIDE DT, or
+	 * look up these descriptors named "cd" and "wp" right here, fail
+	 * silently of these do not exist
+	 */
+	if (!np) {
+		ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0);
+		if (ret == -EPROBE_DEFER)
+			goto clk_disable;
+
+		ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0);
+		if (ret == -EPROBE_DEFER)
+			goto clk_disable;
+	}
+
+	ret = devm_request_threaded_irq(&dev->dev, dev->irq[0], mmci_irq,
+					mmci_irq_thread, IRQF_SHARED,
+					DRIVER_NAME " (cmd)", host);
+	if (ret)
+		goto clk_disable;
+
+	if (!dev->irq[1])
+		host->singleirq = true;
+	else {
+		ret = devm_request_irq(&dev->dev, dev->irq[1], mmci_pio_irq,
+				IRQF_SHARED, DRIVER_NAME " (pio)", host);
+		if (ret)
+			goto clk_disable;
+	}
+
+	writel(MCI_IRQENABLE | variant->start_err, host->base + MMCIMASK0);
+
+	amba_set_drvdata(dev, mmc);
+
+	dev_info(&dev->dev, "%s: PL%03x manf %x rev%u at 0x%08llx irq %d,%d (pio)\n",
+		 mmc_hostname(mmc), amba_part(dev), amba_manf(dev),
+		 amba_rev(dev), (unsigned long long)dev->res.start,
+		 dev->irq[0], dev->irq[1]);
+
+	mmci_dma_setup(host);
+
+	pm_runtime_set_autosuspend_delay(&dev->dev, 50);
+	pm_runtime_use_autosuspend(&dev->dev);
+
+	ret = mmc_add_host(mmc);
+	if (ret)
+		goto clk_disable;
+
+	pm_runtime_put(&dev->dev);
+	return 0;
+
+ clk_disable:
+	clk_disable_unprepare(host->clk);
+ host_free:
+	mmc_free_host(mmc);
+	return ret;
+}
+
+static void mmci_remove(struct amba_device *dev)
+{
+	struct mmc_host *mmc = amba_get_drvdata(dev);
+
+	if (mmc) {
+		struct mmci_host *host = mmc_priv(mmc);
+		struct variant_data *variant = host->variant;
+
+		/*
+		 * Undo pm_runtime_put() in probe.  We use the _sync
+		 * version here so that we can access the primecell.
+		 */
+		pm_runtime_get_sync(&dev->dev);
+
+		mmc_remove_host(mmc);
+
+		writel(0, host->base + MMCIMASK0);
+
+		if (variant->mmcimask1)
+			writel(0, host->base + MMCIMASK1);
+
+		writel(0, host->base + MMCICOMMAND);
+		writel(0, host->base + MMCIDATACTRL);
+
+		mmci_dma_release(host);
+		clk_disable_unprepare(host->clk);
+		mmc_free_host(mmc);
+	}
+}
+
+#ifdef CONFIG_PM
+static void mmci_save(struct mmci_host *host)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	writel(0, host->base + MMCIMASK0);
+	if (host->variant->pwrreg_nopower) {
+		writel(0, host->base + MMCIDATACTRL);
+		writel(0, host->base + MMCIPOWER);
+		writel(0, host->base + MMCICLOCK);
+	}
+	mmci_reg_delay(host);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void mmci_restore(struct mmci_host *host)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	if (host->variant->pwrreg_nopower) {
+		writel(host->clk_reg, host->base + MMCICLOCK);
+		writel(host->datactrl_reg, host->base + MMCIDATACTRL);
+		writel(host->pwr_reg, host->base + MMCIPOWER);
+	}
+	writel(MCI_IRQENABLE | host->variant->start_err,
+	       host->base + MMCIMASK0);
+	mmci_reg_delay(host);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static int mmci_runtime_suspend(struct device *dev)
+{
+	struct amba_device *adev = to_amba_device(dev);
+	struct mmc_host *mmc = amba_get_drvdata(adev);
+
+	if (mmc) {
+		struct mmci_host *host = mmc_priv(mmc);
+		pinctrl_pm_select_sleep_state(dev);
+		mmci_save(host);
+		clk_disable_unprepare(host->clk);
+	}
+
+	return 0;
+}
+
+static int mmci_runtime_resume(struct device *dev)
+{
+	struct amba_device *adev = to_amba_device(dev);
+	struct mmc_host *mmc = amba_get_drvdata(adev);
+
+	if (mmc) {
+		struct mmci_host *host = mmc_priv(mmc);
+		clk_prepare_enable(host->clk);
+		mmci_restore(host);
+		pinctrl_select_default_state(dev);
+	}
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops mmci_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+	SET_RUNTIME_PM_OPS(mmci_runtime_suspend, mmci_runtime_resume, NULL)
+};
+
+static const struct amba_id mmci_ids[] = {
+	{
+		.id	= 0x00041180,
+		.mask	= 0xff0fffff,
+		.data	= &variant_arm,
+	},
+	{
+		.id	= 0x01041180,
+		.mask	= 0xff0fffff,
+		.data	= &variant_arm_extended_fifo,
+	},
+	{
+		.id	= 0x02041180,
+		.mask	= 0xff0fffff,
+		.data	= &variant_arm_extended_fifo_hwfc,
+	},
+	{
+		.id	= 0x00041181,
+		.mask	= 0x000fffff,
+		.data	= &variant_arm,
+	},
+	/* ST Micro variants */
+	{
+		.id     = 0x00180180,
+		.mask   = 0x00ffffff,
+		.data	= &variant_u300,
+	},
+	{
+		.id     = 0x10180180,
+		.mask   = 0xf0ffffff,
+		.data	= &variant_nomadik,
+	},
+	{
+		.id     = 0x00280180,
+		.mask   = 0x00ffffff,
+		.data	= &variant_nomadik,
+	},
+	{
+		.id     = 0x00480180,
+		.mask   = 0xf0ffffff,
+		.data	= &variant_ux500,
+	},
+	{
+		.id     = 0x10480180,
+		.mask   = 0xf0ffffff,
+		.data	= &variant_ux500v2,
+	},
+	{
+		.id     = 0x00880180,
+		.mask   = 0x00ffffff,
+		.data	= &variant_stm32,
+	},
+	{
+		.id     = 0x10153180,
+		.mask	= 0xf0ffffff,
+		.data	= &variant_stm32_sdmmc,
+	},
+	{
+		.id     = 0x00253180,
+		.mask	= 0xf0ffffff,
+		.data	= &variant_stm32_sdmmcv2,
+	},
+	/* Qualcomm variants */
+	{
+		.id     = 0x00051180,
+		.mask	= 0x000fffff,
+		.data	= &variant_qcom,
+	},
+	{ 0, 0 },
+};
+
+MODULE_DEVICE_TABLE(amba, mmci_ids);
+
+static struct amba_driver mmci_driver = {
+	.drv		= {
+		.name	= DRIVER_NAME,
+		.pm	= &mmci_dev_pm_ops,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+	},
+	.probe		= mmci_probe,
+	.remove		= mmci_remove,
+	.id_table	= mmci_ids,
+};
+
+module_amba_driver(mmci_driver);
+
+module_param(fmax, uint, 0444);
+
+MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
+MODULE_LICENSE("GPL");