Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 698 insertions, 0 deletions

diff --git a/drivers/mmc/host/uniphier-sd.c b/drivers/mmc/host/uniphier-sd.c
new file mode 100644
index 000000000..3a8defdcc
--- /dev/null
+++ b/drivers/mmc/host/uniphier-sd.c
@@ -0,0 +1,698 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2017-2018 Socionext Inc.
+//   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
+
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/mfd/tmio.h>
+#include <linux/mmc/host.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include "tmio_mmc.h"
+
+#define   UNIPHIER_SD_CLK_CTL_DIV1024		BIT(16)
+#define   UNIPHIER_SD_CLK_CTL_DIV1		BIT(10)
+#define   UNIPHIER_SD_CLKCTL_OFFEN		BIT(9)  // auto SDCLK stop
+#define UNIPHIER_SD_CC_EXT_MODE		0x1b0
+#define   UNIPHIER_SD_CC_EXT_MODE_DMA		BIT(1)
+#define UNIPHIER_SD_HOST_MODE		0x1c8
+#define UNIPHIER_SD_VOLT		0x1e4
+#define   UNIPHIER_SD_VOLT_MASK			GENMASK(1, 0)
+#define   UNIPHIER_SD_VOLT_OFF			0
+#define   UNIPHIER_SD_VOLT_330			1	// 3.3V signal
+#define   UNIPHIER_SD_VOLT_180			2	// 1.8V signal
+#define UNIPHIER_SD_DMA_MODE		0x410
+#define   UNIPHIER_SD_DMA_MODE_DIR_MASK		GENMASK(17, 16)
+#define   UNIPHIER_SD_DMA_MODE_DIR_TO_DEV	0
+#define   UNIPHIER_SD_DMA_MODE_DIR_FROM_DEV	1
+#define   UNIPHIER_SD_DMA_MODE_WIDTH_MASK	GENMASK(5, 4)
+#define   UNIPHIER_SD_DMA_MODE_WIDTH_8		0
+#define   UNIPHIER_SD_DMA_MODE_WIDTH_16		1
+#define   UNIPHIER_SD_DMA_MODE_WIDTH_32		2
+#define   UNIPHIER_SD_DMA_MODE_WIDTH_64		3
+#define   UNIPHIER_SD_DMA_MODE_ADDR_INC		BIT(0)	// 1: inc, 0: fixed
+#define UNIPHIER_SD_DMA_CTL		0x414
+#define   UNIPHIER_SD_DMA_CTL_START	BIT(0)	// start DMA (auto cleared)
+#define UNIPHIER_SD_DMA_RST		0x418
+#define   UNIPHIER_SD_DMA_RST_CH1	BIT(9)
+#define   UNIPHIER_SD_DMA_RST_CH0	BIT(8)
+#define UNIPHIER_SD_DMA_ADDR_L		0x440
+#define UNIPHIER_SD_DMA_ADDR_H		0x444
+
+/*
+ * IP is extended to support various features: built-in DMA engine,
+ * 1/1024 divisor, etc.
+ */
+#define UNIPHIER_SD_CAP_EXTENDED_IP		BIT(0)
+/* RX channel of the built-in DMA controller is broken (Pro5) */
+#define UNIPHIER_SD_CAP_BROKEN_DMA_RX		BIT(1)
+
+struct uniphier_sd_priv {
+	struct tmio_mmc_data tmio_data;
+	struct pinctrl *pinctrl;
+	struct pinctrl_state *pinstate_uhs;
+	struct clk *clk;
+	struct reset_control *rst;
+	struct reset_control *rst_br;
+	struct reset_control *rst_hw;
+	struct dma_chan *chan;
+	enum dma_data_direction dma_dir;
+	unsigned long clk_rate;
+	unsigned long caps;
+};
+
+static void *uniphier_sd_priv(struct tmio_mmc_host *host)
+{
+	return container_of(host->pdata, struct uniphier_sd_priv, tmio_data);
+}
+
+static void uniphier_sd_dma_endisable(struct tmio_mmc_host *host, int enable)
+{
+	sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? DMA_ENABLE_DMASDRW : 0);
+}
+
+/* external DMA engine */
+static void uniphier_sd_external_dma_issue(struct tasklet_struct *t)
+{
+	struct tmio_mmc_host *host = from_tasklet(host, t, dma_issue);
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+
+	uniphier_sd_dma_endisable(host, 1);
+	dma_async_issue_pending(priv->chan);
+}
+
+static void uniphier_sd_external_dma_callback(void *param,
+					const struct dmaengine_result *result)
+{
+	struct tmio_mmc_host *host = param;
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+	unsigned long flags;
+
+	dma_unmap_sg(mmc_dev(host->mmc), host->sg_ptr, host->sg_len,
+		     priv->dma_dir);
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	if (result->result == DMA_TRANS_NOERROR) {
+		/*
+		 * When the external DMA engine is enabled, strangely enough,
+		 * the DATAEND flag can be asserted even if the DMA engine has
+		 * not been kicked yet.  Enable the TMIO_STAT_DATAEND irq only
+		 * after we make sure the DMA engine finishes the transfer,
+		 * hence, in this callback.
+		 */
+		tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
+	} else {
+		host->data->error = -ETIMEDOUT;
+		tmio_mmc_do_data_irq(host);
+	}
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void uniphier_sd_external_dma_start(struct tmio_mmc_host *host,
+					   struct mmc_data *data)
+{
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+	enum dma_transfer_direction dma_tx_dir;
+	struct dma_async_tx_descriptor *desc;
+	dma_cookie_t cookie;
+	int sg_len;
+
+	if (!priv->chan)
+		goto force_pio;
+
+	if (data->flags & MMC_DATA_READ) {
+		priv->dma_dir = DMA_FROM_DEVICE;
+		dma_tx_dir = DMA_DEV_TO_MEM;
+	} else {
+		priv->dma_dir = DMA_TO_DEVICE;
+		dma_tx_dir = DMA_MEM_TO_DEV;
+	}
+
+	sg_len = dma_map_sg(mmc_dev(host->mmc), host->sg_ptr, host->sg_len,
+			    priv->dma_dir);
+	if (sg_len == 0)
+		goto force_pio;
+
+	desc = dmaengine_prep_slave_sg(priv->chan, host->sg_ptr, sg_len,
+				       dma_tx_dir, DMA_CTRL_ACK);
+	if (!desc)
+		goto unmap_sg;
+
+	desc->callback_result = uniphier_sd_external_dma_callback;
+	desc->callback_param = host;
+
+	cookie = dmaengine_submit(desc);
+	if (cookie < 0)
+		goto unmap_sg;
+
+	host->dma_on = true;
+
+	return;
+
+unmap_sg:
+	dma_unmap_sg(mmc_dev(host->mmc), host->sg_ptr, host->sg_len,
+		     priv->dma_dir);
+force_pio:
+	uniphier_sd_dma_endisable(host, 0);
+}
+
+static void uniphier_sd_external_dma_enable(struct tmio_mmc_host *host,
+					    bool enable)
+{
+}
+
+static void uniphier_sd_external_dma_request(struct tmio_mmc_host *host,
+					     struct tmio_mmc_data *pdata)
+{
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+	struct dma_chan *chan;
+
+	chan = dma_request_chan(mmc_dev(host->mmc), "rx-tx");
+	if (IS_ERR(chan)) {
+		dev_warn(mmc_dev(host->mmc),
+			 "failed to request DMA channel. falling back to PIO\n");
+		return;	/* just use PIO even for -EPROBE_DEFER */
+	}
+
+	/* this driver uses a single channel for both RX an TX */
+	priv->chan = chan;
+	host->chan_rx = chan;
+	host->chan_tx = chan;
+
+	tasklet_setup(&host->dma_issue, uniphier_sd_external_dma_issue);
+}
+
+static void uniphier_sd_external_dma_release(struct tmio_mmc_host *host)
+{
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+
+	if (priv->chan)
+		dma_release_channel(priv->chan);
+}
+
+static void uniphier_sd_external_dma_abort(struct tmio_mmc_host *host)
+{
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+
+	uniphier_sd_dma_endisable(host, 0);
+
+	if (priv->chan)
+		dmaengine_terminate_sync(priv->chan);
+}
+
+static void uniphier_sd_external_dma_dataend(struct tmio_mmc_host *host)
+{
+	uniphier_sd_dma_endisable(host, 0);
+
+	tmio_mmc_do_data_irq(host);
+}
+
+static const struct tmio_mmc_dma_ops uniphier_sd_external_dma_ops = {
+	.start = uniphier_sd_external_dma_start,
+	.enable = uniphier_sd_external_dma_enable,
+	.request = uniphier_sd_external_dma_request,
+	.release = uniphier_sd_external_dma_release,
+	.abort = uniphier_sd_external_dma_abort,
+	.dataend = uniphier_sd_external_dma_dataend,
+};
+
+static void uniphier_sd_internal_dma_issue(struct tasklet_struct *t)
+{
+	struct tmio_mmc_host *host = from_tasklet(host, t, dma_issue);
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+	tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	uniphier_sd_dma_endisable(host, 1);
+	writel(UNIPHIER_SD_DMA_CTL_START, host->ctl + UNIPHIER_SD_DMA_CTL);
+}
+
+static void uniphier_sd_internal_dma_start(struct tmio_mmc_host *host,
+					   struct mmc_data *data)
+{
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+	struct scatterlist *sg = host->sg_ptr;
+	dma_addr_t dma_addr;
+	unsigned int dma_mode_dir;
+	u32 dma_mode;
+	int sg_len;
+
+	if ((data->flags & MMC_DATA_READ) && !host->chan_rx)
+		goto force_pio;
+
+	if (WARN_ON(host->sg_len != 1))
+		goto force_pio;
+
+	if (!IS_ALIGNED(sg->offset, 8))
+		goto force_pio;
+
+	if (data->flags & MMC_DATA_READ) {
+		priv->dma_dir = DMA_FROM_DEVICE;
+		dma_mode_dir = UNIPHIER_SD_DMA_MODE_DIR_FROM_DEV;
+	} else {
+		priv->dma_dir = DMA_TO_DEVICE;
+		dma_mode_dir = UNIPHIER_SD_DMA_MODE_DIR_TO_DEV;
+	}
+
+	sg_len = dma_map_sg(mmc_dev(host->mmc), sg, 1, priv->dma_dir);
+	if (sg_len == 0)
+		goto force_pio;
+
+	dma_mode = FIELD_PREP(UNIPHIER_SD_DMA_MODE_DIR_MASK, dma_mode_dir);
+	dma_mode |= FIELD_PREP(UNIPHIER_SD_DMA_MODE_WIDTH_MASK,
+			       UNIPHIER_SD_DMA_MODE_WIDTH_64);
+	dma_mode |= UNIPHIER_SD_DMA_MODE_ADDR_INC;
+
+	writel(dma_mode, host->ctl + UNIPHIER_SD_DMA_MODE);
+
+	dma_addr = sg_dma_address(data->sg);
+	writel(lower_32_bits(dma_addr), host->ctl + UNIPHIER_SD_DMA_ADDR_L);
+	writel(upper_32_bits(dma_addr), host->ctl + UNIPHIER_SD_DMA_ADDR_H);
+
+	host->dma_on = true;
+
+	return;
+force_pio:
+	uniphier_sd_dma_endisable(host, 0);
+}
+
+static void uniphier_sd_internal_dma_enable(struct tmio_mmc_host *host,
+					    bool enable)
+{
+}
+
+static void uniphier_sd_internal_dma_request(struct tmio_mmc_host *host,
+					     struct tmio_mmc_data *pdata)
+{
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+
+	/*
+	 * Due to a hardware bug, Pro5 cannot use DMA for RX.
+	 * We can still use DMA for TX, but PIO for RX.
+	 */
+	if (!(priv->caps & UNIPHIER_SD_CAP_BROKEN_DMA_RX))
+		host->chan_rx = (void *)0xdeadbeaf;
+
+	host->chan_tx = (void *)0xdeadbeaf;
+
+	tasklet_setup(&host->dma_issue, uniphier_sd_internal_dma_issue);
+}
+
+static void uniphier_sd_internal_dma_release(struct tmio_mmc_host *host)
+{
+	/* Each value is set to zero to assume "disabling" each DMA */
+	host->chan_rx = NULL;
+	host->chan_tx = NULL;
+}
+
+static void uniphier_sd_internal_dma_abort(struct tmio_mmc_host *host)
+{
+	u32 tmp;
+
+	uniphier_sd_dma_endisable(host, 0);
+
+	tmp = readl(host->ctl + UNIPHIER_SD_DMA_RST);
+	tmp &= ~(UNIPHIER_SD_DMA_RST_CH1 | UNIPHIER_SD_DMA_RST_CH0);
+	writel(tmp, host->ctl + UNIPHIER_SD_DMA_RST);
+
+	tmp |= UNIPHIER_SD_DMA_RST_CH1 | UNIPHIER_SD_DMA_RST_CH0;
+	writel(tmp, host->ctl + UNIPHIER_SD_DMA_RST);
+}
+
+static void uniphier_sd_internal_dma_dataend(struct tmio_mmc_host *host)
+{
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+
+	uniphier_sd_dma_endisable(host, 0);
+	dma_unmap_sg(mmc_dev(host->mmc), host->sg_ptr, 1, priv->dma_dir);
+
+	tmio_mmc_do_data_irq(host);
+}
+
+static const struct tmio_mmc_dma_ops uniphier_sd_internal_dma_ops = {
+	.start = uniphier_sd_internal_dma_start,
+	.enable = uniphier_sd_internal_dma_enable,
+	.request = uniphier_sd_internal_dma_request,
+	.release = uniphier_sd_internal_dma_release,
+	.abort = uniphier_sd_internal_dma_abort,
+	.dataend = uniphier_sd_internal_dma_dataend,
+};
+
+static int uniphier_sd_clk_enable(struct tmio_mmc_host *host)
+{
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+	struct mmc_host *mmc = host->mmc;
+	int ret;
+
+	ret = clk_prepare_enable(priv->clk);
+	if (ret)
+		return ret;
+
+	ret = clk_set_rate(priv->clk, ULONG_MAX);
+	if (ret)
+		goto disable_clk;
+
+	priv->clk_rate = clk_get_rate(priv->clk);
+
+	/* If max-frequency property is set, use it. */
+	if (!mmc->f_max)
+		mmc->f_max = priv->clk_rate;
+
+	/*
+	 * 1/512 is the finest divisor in the original IP.  Newer versions
+	 * also supports 1/1024 divisor. (UniPhier-specific extension)
+	 */
+	if (priv->caps & UNIPHIER_SD_CAP_EXTENDED_IP)
+		mmc->f_min = priv->clk_rate / 1024;
+	else
+		mmc->f_min = priv->clk_rate / 512;
+
+	ret = reset_control_deassert(priv->rst);
+	if (ret)
+		goto disable_clk;
+
+	ret = reset_control_deassert(priv->rst_br);
+	if (ret)
+		goto assert_rst;
+
+	return 0;
+
+assert_rst:
+	reset_control_assert(priv->rst);
+disable_clk:
+	clk_disable_unprepare(priv->clk);
+
+	return ret;
+}
+
+static void uniphier_sd_clk_disable(struct tmio_mmc_host *host)
+{
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+
+	reset_control_assert(priv->rst_br);
+	reset_control_assert(priv->rst);
+	clk_disable_unprepare(priv->clk);
+}
+
+static void uniphier_sd_hw_reset(struct mmc_host *mmc)
+{
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+
+	reset_control_assert(priv->rst_hw);
+	/* For eMMC, minimum is 1us but give it 9us for good measure */
+	udelay(9);
+	reset_control_deassert(priv->rst_hw);
+	/* For eMMC, minimum is 200us but give it 300us for good measure */
+	usleep_range(300, 1000);
+}
+
+static void uniphier_sd_set_clock(struct tmio_mmc_host *host,
+				  unsigned int clock)
+{
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+	unsigned long divisor;
+	u32 tmp;
+
+	tmp = readl(host->ctl + (CTL_SD_CARD_CLK_CTL << 1));
+
+	/* stop the clock before changing its rate to avoid a glitch signal */
+	tmp &= ~CLK_CTL_SCLKEN;
+	writel(tmp, host->ctl + (CTL_SD_CARD_CLK_CTL << 1));
+
+	if (clock == 0)
+		return;
+
+	tmp &= ~UNIPHIER_SD_CLK_CTL_DIV1024;
+	tmp &= ~UNIPHIER_SD_CLK_CTL_DIV1;
+	tmp &= ~CLK_CTL_DIV_MASK;
+
+	divisor = priv->clk_rate / clock;
+
+	/*
+	 * In the original IP, bit[7:0] represents the divisor.
+	 * bit7 set: 1/512, ... bit0 set:1/4, all bits clear: 1/2
+	 *
+	 * The IP does not define a way to achieve 1/1.  For UniPhier variants,
+	 * bit10 is used for 1/1.  Newer versions of UniPhier variants use
+	 * bit16 for 1/1024.
+	 */
+	if (divisor <= 1)
+		tmp |= UNIPHIER_SD_CLK_CTL_DIV1;
+	else if (priv->caps & UNIPHIER_SD_CAP_EXTENDED_IP && divisor > 512)
+		tmp |= UNIPHIER_SD_CLK_CTL_DIV1024;
+	else
+		tmp |= roundup_pow_of_two(divisor) >> 2;
+
+	writel(tmp, host->ctl + (CTL_SD_CARD_CLK_CTL << 1));
+
+	tmp |= CLK_CTL_SCLKEN;
+	writel(tmp, host->ctl + (CTL_SD_CARD_CLK_CTL << 1));
+}
+
+static void uniphier_sd_host_init(struct tmio_mmc_host *host)
+{
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+	u32 val;
+
+	/*
+	 * Connected to 32bit AXI.
+	 * This register holds settings for SoC-specific internal bus
+	 * connection.  What is worse, the register spec was changed,
+	 * breaking the backward compatibility.  Write an appropriate
+	 * value depending on a flag associated with a compatible string.
+	 */
+	if (priv->caps & UNIPHIER_SD_CAP_EXTENDED_IP)
+		val = 0x00000101;
+	else
+		val = 0x00000000;
+
+	writel(val, host->ctl + UNIPHIER_SD_HOST_MODE);
+
+	val = 0;
+	/*
+	 * If supported, the controller can automatically
+	 * enable/disable the clock line to the card.
+	 */
+	if (priv->caps & UNIPHIER_SD_CAP_EXTENDED_IP)
+		val |= UNIPHIER_SD_CLKCTL_OFFEN;
+
+	writel(val, host->ctl + (CTL_SD_CARD_CLK_CTL << 1));
+}
+
+static int uniphier_sd_start_signal_voltage_switch(struct mmc_host *mmc,
+						   struct mmc_ios *ios)
+{
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
+	struct pinctrl_state *pinstate = NULL;
+	u32 val, tmp;
+
+	switch (ios->signal_voltage) {
+	case MMC_SIGNAL_VOLTAGE_330:
+		val = UNIPHIER_SD_VOLT_330;
+		break;
+	case MMC_SIGNAL_VOLTAGE_180:
+		val = UNIPHIER_SD_VOLT_180;
+		pinstate = priv->pinstate_uhs;
+		break;
+	default:
+		return -ENOTSUPP;
+	}
+
+	tmp = readl(host->ctl + UNIPHIER_SD_VOLT);
+	tmp &= ~UNIPHIER_SD_VOLT_MASK;
+	tmp |= FIELD_PREP(UNIPHIER_SD_VOLT_MASK, val);
+	writel(tmp, host->ctl + UNIPHIER_SD_VOLT);
+
+	if (pinstate)
+		pinctrl_select_state(priv->pinctrl, pinstate);
+	else
+		pinctrl_select_default_state(mmc_dev(mmc));
+
+	return 0;
+}
+
+static int uniphier_sd_uhs_init(struct tmio_mmc_host *host,
+				struct uniphier_sd_priv *priv)
+{
+	priv->pinctrl = devm_pinctrl_get(mmc_dev(host->mmc));
+	if (IS_ERR(priv->pinctrl))
+		return PTR_ERR(priv->pinctrl);
+
+	priv->pinstate_uhs = pinctrl_lookup_state(priv->pinctrl, "uhs");
+	if (IS_ERR(priv->pinstate_uhs))
+		return PTR_ERR(priv->pinstate_uhs);
+
+	host->ops.start_signal_voltage_switch =
+					uniphier_sd_start_signal_voltage_switch;
+
+	return 0;
+}
+
+static int uniphier_sd_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct uniphier_sd_priv *priv;
+	struct tmio_mmc_data *tmio_data;
+	struct tmio_mmc_host *host;
+	int irq, ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->caps = (unsigned long)of_device_get_match_data(dev);
+
+	priv->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(priv->clk)) {
+		dev_err(dev, "failed to get clock\n");
+		return PTR_ERR(priv->clk);
+	}
+
+	priv->rst = devm_reset_control_get_shared(dev, "host");
+	if (IS_ERR(priv->rst)) {
+		dev_err(dev, "failed to get host reset\n");
+		return PTR_ERR(priv->rst);
+	}
+
+	/* old version has one more reset */
+	if (!(priv->caps & UNIPHIER_SD_CAP_EXTENDED_IP)) {
+		priv->rst_br = devm_reset_control_get_shared(dev, "bridge");
+		if (IS_ERR(priv->rst_br)) {
+			dev_err(dev, "failed to get bridge reset\n");
+			return PTR_ERR(priv->rst_br);
+		}
+	}
+
+	tmio_data = &priv->tmio_data;
+	tmio_data->flags |= TMIO_MMC_32BIT_DATA_PORT;
+	tmio_data->flags |= TMIO_MMC_USE_BUSY_TIMEOUT;
+
+	host = tmio_mmc_host_alloc(pdev, tmio_data);
+	if (IS_ERR(host))
+		return PTR_ERR(host);
+
+	if (host->mmc->caps & MMC_CAP_HW_RESET) {
+		priv->rst_hw = devm_reset_control_get_exclusive(dev, "hw");
+		if (IS_ERR(priv->rst_hw)) {
+			dev_err(dev, "failed to get hw reset\n");
+			ret = PTR_ERR(priv->rst_hw);
+			goto free_host;
+		}
+		host->ops.card_hw_reset = uniphier_sd_hw_reset;
+	}
+
+	if (host->mmc->caps & MMC_CAP_UHS) {
+		ret = uniphier_sd_uhs_init(host, priv);
+		if (ret) {
+			dev_warn(dev,
+				 "failed to setup UHS (error %d).  Disabling UHS.",
+				 ret);
+			host->mmc->caps &= ~MMC_CAP_UHS;
+		}
+	}
+
+	if (priv->caps & UNIPHIER_SD_CAP_EXTENDED_IP)
+		host->dma_ops = &uniphier_sd_internal_dma_ops;
+	else
+		host->dma_ops = &uniphier_sd_external_dma_ops;
+
+	host->bus_shift = 1;
+	host->clk_enable = uniphier_sd_clk_enable;
+	host->clk_disable = uniphier_sd_clk_disable;
+	host->set_clock = uniphier_sd_set_clock;
+
+	ret = uniphier_sd_clk_enable(host);
+	if (ret)
+		goto free_host;
+
+	uniphier_sd_host_init(host);
+
+	tmio_data->ocr_mask = MMC_VDD_32_33 | MMC_VDD_33_34;
+	if (host->mmc->caps & MMC_CAP_UHS)
+		tmio_data->ocr_mask |= MMC_VDD_165_195;
+
+	tmio_data->max_segs = 1;
+	tmio_data->max_blk_count = U16_MAX;
+
+	ret = tmio_mmc_host_probe(host);
+	if (ret)
+		goto disable_clk;
+
+	ret = devm_request_irq(dev, irq, tmio_mmc_irq, IRQF_SHARED,
+			       dev_name(dev), host);
+	if (ret)
+		goto remove_host;
+
+	return 0;
+
+remove_host:
+	tmio_mmc_host_remove(host);
+disable_clk:
+	uniphier_sd_clk_disable(host);
+free_host:
+	tmio_mmc_host_free(host);
+
+	return ret;
+}
+
+static int uniphier_sd_remove(struct platform_device *pdev)
+{
+	struct tmio_mmc_host *host = platform_get_drvdata(pdev);
+
+	tmio_mmc_host_remove(host);
+	uniphier_sd_clk_disable(host);
+	tmio_mmc_host_free(host);
+
+	return 0;
+}
+
+static const struct of_device_id uniphier_sd_match[] = {
+	{
+		.compatible = "socionext,uniphier-sd-v2.91",
+	},
+	{
+		.compatible = "socionext,uniphier-sd-v3.1",
+		.data = (void *)(UNIPHIER_SD_CAP_EXTENDED_IP |
+				 UNIPHIER_SD_CAP_BROKEN_DMA_RX),
+	},
+	{
+		.compatible = "socionext,uniphier-sd-v3.1.1",
+		.data = (void *)UNIPHIER_SD_CAP_EXTENDED_IP,
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, uniphier_sd_match);
+
+static struct platform_driver uniphier_sd_driver = {
+	.probe = uniphier_sd_probe,
+	.remove = uniphier_sd_remove,
+	.driver = {
+		.name = "uniphier-sd",
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		.of_match_table = uniphier_sd_match,
+	},
+};
+module_platform_driver(uniphier_sd_driver);
+
+MODULE_AUTHOR("Masahiro Yamada <yamada.masahiro@socionext.com>");
+MODULE_DESCRIPTION("UniPhier SD/eMMC host controller driver");
+MODULE_LICENSE("GPL v2");