Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 922 insertions, 0 deletions

diff --git a/drivers/mmc/host/meson-mx-sdhc-mmc.c b/drivers/mmc/host/meson-mx-sdhc-mmc.c
new file mode 100644
index 0000000000..1ed9731e77
--- /dev/null
+++ b/drivers/mmc/host/meson-mx-sdhc-mmc.c
@@ -0,0 +1,922 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Amlogic Meson6/Meson8/Meson8b/Meson8m2 SDHC MMC host controller driver.
+ *
+ * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/types.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/slot-gpio.h>
+
+#include "meson-mx-sdhc.h"
+
+#define MESON_SDHC_NUM_BULK_CLKS				4
+#define MESON_SDHC_MAX_BLK_SIZE					512
+#define MESON_SDHC_NUM_TUNING_TRIES				10
+
+#define MESON_SDHC_WAIT_CMD_READY_SLEEP_US			1
+#define MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US			100000
+#define MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US			1
+#define MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US			200
+
+struct meson_mx_sdhc_data {
+	void		(*init_hw)(struct mmc_host *mmc);
+	void		(*set_pdma)(struct mmc_host *mmc);
+	void		(*wait_before_send)(struct mmc_host *mmc);
+	bool		hardware_flush_all_cmds;
+};
+
+struct meson_mx_sdhc_host {
+	struct mmc_host			*mmc;
+
+	struct mmc_request		*mrq;
+	struct mmc_command		*cmd;
+	int				error;
+
+	struct regmap			*regmap;
+
+	struct clk			*pclk;
+	struct clk			*sd_clk;
+	struct clk_bulk_data		bulk_clks[MESON_SDHC_NUM_BULK_CLKS];
+	bool				bulk_clks_enabled;
+
+	const struct meson_mx_sdhc_data	*platform;
+};
+
+static const struct regmap_config meson_mx_sdhc_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.max_register = MESON_SDHC_CLK2,
+};
+
+static void meson_mx_sdhc_hw_reset(struct mmc_host *mmc)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+	regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_MAIN_CTRL |
+		     MESON_SDHC_SRST_RXFIFO | MESON_SDHC_SRST_TXFIFO |
+		     MESON_SDHC_SRST_DPHY_RX | MESON_SDHC_SRST_DPHY_TX |
+		     MESON_SDHC_SRST_DMA_IF);
+	usleep_range(10, 100);
+
+	regmap_write(host->regmap, MESON_SDHC_SRST, 0);
+	usleep_range(10, 100);
+}
+
+static void meson_mx_sdhc_clear_fifo(struct mmc_host *mmc)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+	u32 stat;
+
+	regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
+	if (!FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) &&
+	    !FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat))
+		return;
+
+	regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_RXFIFO |
+		     MESON_SDHC_SRST_TXFIFO | MESON_SDHC_SRST_MAIN_CTRL);
+	udelay(5);
+
+	regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
+	if (FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) ||
+	    FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat))
+		dev_warn(mmc_dev(host->mmc),
+			 "Failed to clear FIFOs, RX: %lu, TX: %lu\n",
+			 FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat),
+			 FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat));
+}
+
+static void meson_mx_sdhc_wait_cmd_ready(struct mmc_host *mmc)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+	u32 stat, esta;
+	int ret;
+
+	ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT, stat,
+				       !(stat & MESON_SDHC_STAT_CMD_BUSY),
+				       MESON_SDHC_WAIT_CMD_READY_SLEEP_US,
+				       MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US);
+	if (ret) {
+		dev_warn(mmc_dev(mmc),
+			 "Failed to poll for CMD_BUSY while processing CMD%d\n",
+			 host->cmd->opcode);
+		meson_mx_sdhc_hw_reset(mmc);
+	}
+
+	ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, esta,
+				       !(esta & MESON_SDHC_ESTA_11_13),
+				       MESON_SDHC_WAIT_CMD_READY_SLEEP_US,
+				       MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US);
+	if (ret) {
+		dev_warn(mmc_dev(mmc),
+			 "Failed to poll for ESTA[13:11] while processing CMD%d\n",
+			 host->cmd->opcode);
+		meson_mx_sdhc_hw_reset(mmc);
+	}
+}
+
+static void meson_mx_sdhc_start_cmd(struct mmc_host *mmc,
+				    struct mmc_command *cmd)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+	bool manual_stop = false;
+	u32 ictl, send;
+	int pack_len;
+
+	host->cmd = cmd;
+
+	ictl = MESON_SDHC_ICTL_DATA_TIMEOUT | MESON_SDHC_ICTL_DATA_ERR_CRC |
+	       MESON_SDHC_ICTL_RXFIFO_FULL | MESON_SDHC_ICTL_TXFIFO_EMPTY |
+	       MESON_SDHC_ICTL_RESP_TIMEOUT | MESON_SDHC_ICTL_RESP_ERR_CRC;
+
+	send = FIELD_PREP(MESON_SDHC_SEND_CMD_INDEX, cmd->opcode);
+
+	if (cmd->data) {
+		send |= MESON_SDHC_SEND_CMD_HAS_DATA;
+		send |= FIELD_PREP(MESON_SDHC_SEND_TOTAL_PACK,
+				   cmd->data->blocks - 1);
+
+		if (cmd->data->blksz < MESON_SDHC_MAX_BLK_SIZE)
+			pack_len = cmd->data->blksz;
+		else
+			pack_len = 0;
+
+		if (cmd->data->flags & MMC_DATA_WRITE)
+			send |= MESON_SDHC_SEND_DATA_DIR;
+
+		/*
+		 * If command with no data, just wait response done
+		 * interrupt(int[0]), and if command with data transfer, just
+		 * wait dma done interrupt(int[11]), don't need care about
+		 * dat0 busy or not.
+		 */
+		if (host->platform->hardware_flush_all_cmds ||
+		    cmd->data->flags & MMC_DATA_WRITE)
+			/* hardware flush: */
+			ictl |= MESON_SDHC_ICTL_DMA_DONE;
+		else
+			/* software flush: */
+			ictl |= MESON_SDHC_ICTL_DATA_XFER_OK;
+
+		/*
+		 * Mimic the logic from the vendor driver where (only)
+		 * SD_IO_RW_EXTENDED commands with more than one block set the
+		 * MESON_SDHC_MISC_MANUAL_STOP bit. This fixes the firmware
+		 * download in the brcmfmac driver for a BCM43362/1 card.
+		 * Without this sdio_memcpy_toio() (with a size of 219557
+		 * bytes) times out if MESON_SDHC_MISC_MANUAL_STOP is not set.
+		 */
+		manual_stop = cmd->data->blocks > 1 &&
+			      cmd->opcode == SD_IO_RW_EXTENDED;
+	} else {
+		pack_len = 0;
+
+		ictl |= MESON_SDHC_ICTL_RESP_OK;
+	}
+
+	regmap_update_bits(host->regmap, MESON_SDHC_MISC,
+			   MESON_SDHC_MISC_MANUAL_STOP,
+			   manual_stop ? MESON_SDHC_MISC_MANUAL_STOP : 0);
+
+	if (cmd->opcode == MMC_STOP_TRANSMISSION)
+		send |= MESON_SDHC_SEND_DATA_STOP;
+
+	if (cmd->flags & MMC_RSP_PRESENT)
+		send |= MESON_SDHC_SEND_CMD_HAS_RESP;
+
+	if (cmd->flags & MMC_RSP_136) {
+		send |= MESON_SDHC_SEND_RESP_LEN;
+		send |= MESON_SDHC_SEND_RESP_NO_CRC;
+	}
+
+	if (!(cmd->flags & MMC_RSP_CRC))
+		send |= MESON_SDHC_SEND_RESP_NO_CRC;
+
+	if (cmd->flags & MMC_RSP_BUSY)
+		send |= MESON_SDHC_SEND_R1B;
+
+	/* enable the new IRQs and mask all pending ones */
+	regmap_write(host->regmap, MESON_SDHC_ICTL, ictl);
+	regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
+
+	regmap_write(host->regmap, MESON_SDHC_ARGU, cmd->arg);
+
+	regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
+			   MESON_SDHC_CTRL_PACK_LEN,
+			   FIELD_PREP(MESON_SDHC_CTRL_PACK_LEN, pack_len));
+
+	if (cmd->data)
+		regmap_write(host->regmap, MESON_SDHC_ADDR,
+			     sg_dma_address(cmd->data->sg));
+
+	meson_mx_sdhc_wait_cmd_ready(mmc);
+
+	if (cmd->data)
+		host->platform->set_pdma(mmc);
+
+	if (host->platform->wait_before_send)
+		host->platform->wait_before_send(mmc);
+
+	regmap_write(host->regmap, MESON_SDHC_SEND, send);
+}
+
+static void meson_mx_sdhc_disable_clks(struct mmc_host *mmc)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+	if (!host->bulk_clks_enabled)
+		return;
+
+	clk_bulk_disable_unprepare(MESON_SDHC_NUM_BULK_CLKS, host->bulk_clks);
+
+	host->bulk_clks_enabled = false;
+}
+
+static int meson_mx_sdhc_enable_clks(struct mmc_host *mmc)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+	int ret;
+
+	if (host->bulk_clks_enabled)
+		return 0;
+
+	ret = clk_bulk_prepare_enable(MESON_SDHC_NUM_BULK_CLKS,
+				      host->bulk_clks);
+	if (ret)
+		return ret;
+
+	host->bulk_clks_enabled = true;
+
+	return 0;
+}
+
+static int meson_mx_sdhc_set_clk(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+	u32 val, rx_clk_phase;
+	int ret;
+
+	meson_mx_sdhc_disable_clks(mmc);
+
+	if (ios->clock) {
+		ret = clk_set_rate(host->sd_clk, ios->clock);
+		if (ret) {
+			dev_warn(mmc_dev(mmc),
+				 "Failed to set MMC clock to %uHz: %d\n",
+				 ios->clock, host->error);
+			return ret;
+		}
+
+		ret = meson_mx_sdhc_enable_clks(mmc);
+		if (ret)
+			return ret;
+
+		mmc->actual_clock = clk_get_rate(host->sd_clk);
+
+		/*
+		 * Phase 90 should work in most cases. For data transmission,
+		 * meson_mx_sdhc_execute_tuning() will find a accurate value
+		 */
+		regmap_read(host->regmap, MESON_SDHC_CLKC, &val);
+		rx_clk_phase = FIELD_GET(MESON_SDHC_CLKC_CLK_DIV, val) / 4;
+		regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
+				   MESON_SDHC_CLK2_RX_CLK_PHASE,
+				   FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
+					      rx_clk_phase));
+	} else {
+		mmc->actual_clock = 0;
+	}
+
+	return 0;
+}
+
+static void meson_mx_sdhc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+	unsigned short vdd = ios->vdd;
+
+	switch (ios->power_mode) {
+	case MMC_POWER_OFF:
+		vdd = 0;
+		fallthrough;
+
+	case MMC_POWER_UP:
+		if (!IS_ERR(mmc->supply.vmmc)) {
+			host->error = mmc_regulator_set_ocr(mmc,
+							    mmc->supply.vmmc,
+							    vdd);
+			if (host->error)
+				return;
+		}
+
+		break;
+
+	case MMC_POWER_ON:
+		break;
+	}
+
+	host->error = meson_mx_sdhc_set_clk(mmc, ios);
+	if (host->error)
+		return;
+
+	switch (ios->bus_width) {
+	case MMC_BUS_WIDTH_1:
+		regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
+				   MESON_SDHC_CTRL_DAT_TYPE,
+				   FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 0));
+		break;
+
+	case MMC_BUS_WIDTH_4:
+		regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
+				   MESON_SDHC_CTRL_DAT_TYPE,
+				   FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 1));
+		break;
+
+	case MMC_BUS_WIDTH_8:
+		regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
+				   MESON_SDHC_CTRL_DAT_TYPE,
+				   FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 2));
+		break;
+
+	default:
+		dev_err(mmc_dev(mmc), "unsupported bus width: %d\n",
+			ios->bus_width);
+		host->error = -EINVAL;
+		return;
+	}
+}
+
+static int meson_mx_sdhc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct mmc_data *data = mrq->data;
+	unsigned int dma_len;
+
+	if (!data)
+		return 0;
+
+	dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
+			     mmc_get_dma_dir(data));
+	if (!dma_len) {
+		dev_err(mmc_dev(mmc), "dma_map_sg failed\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void meson_mx_sdhc_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+	struct mmc_command *cmd = mrq->cmd;
+
+	if (!host->error)
+		host->error = meson_mx_sdhc_map_dma(mmc, mrq);
+
+	if (host->error) {
+		cmd->error = host->error;
+		mmc_request_done(mmc, mrq);
+		return;
+	}
+
+	host->mrq = mrq;
+
+	meson_mx_sdhc_start_cmd(mmc, mrq->cmd);
+}
+
+static int meson_mx_sdhc_card_busy(struct mmc_host *mmc)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+	u32 stat;
+
+	regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
+	return FIELD_GET(MESON_SDHC_STAT_DAT3_0, stat) == 0;
+}
+
+static bool meson_mx_sdhc_tuning_point_matches(struct mmc_host *mmc,
+					       u32 opcode)
+{
+	unsigned int i, num_matches = 0;
+	int ret;
+
+	for (i = 0; i < MESON_SDHC_NUM_TUNING_TRIES; i++) {
+		ret = mmc_send_tuning(mmc, opcode, NULL);
+		if (!ret)
+			num_matches++;
+	}
+
+	return num_matches == MESON_SDHC_NUM_TUNING_TRIES;
+}
+
+static int meson_mx_sdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+	int div, start, len, best_start, best_len;
+	int curr_phase, old_phase, new_phase;
+	u32 val;
+
+	len = 0;
+	start = 0;
+	best_len = 0;
+
+	regmap_read(host->regmap, MESON_SDHC_CLK2, &val);
+	old_phase = FIELD_GET(MESON_SDHC_CLK2_RX_CLK_PHASE, val);
+
+	regmap_read(host->regmap, MESON_SDHC_CLKC, &val);
+	div = FIELD_GET(MESON_SDHC_CLKC_CLK_DIV, val);
+
+	for (curr_phase = 0; curr_phase <= div; curr_phase++) {
+		regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
+				   MESON_SDHC_CLK2_RX_CLK_PHASE,
+				   FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
+					      curr_phase));
+
+		if (meson_mx_sdhc_tuning_point_matches(mmc, opcode)) {
+			if (!len) {
+				start = curr_phase;
+
+				dev_dbg(mmc_dev(mmc),
+					"New RX phase window starts at %u\n",
+					start);
+			}
+
+			len++;
+		} else {
+			if (len > best_len) {
+				best_start = start;
+				best_len = len;
+
+				dev_dbg(mmc_dev(mmc),
+					"New best RX phase window: %u - %u\n",
+					best_start, best_start + best_len);
+			}
+
+			/* reset the current window */
+			len = 0;
+		}
+	}
+
+	if (len > best_len)
+		/* the last window is the best (or possibly only) window */
+		new_phase = start + (len / 2);
+	else if (best_len)
+		/* there was a better window than the last */
+		new_phase = best_start + (best_len / 2);
+	else
+		/* no window was found at all, reset to the original phase */
+		new_phase = old_phase;
+
+	regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
+			   MESON_SDHC_CLK2_RX_CLK_PHASE,
+			   FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
+				      new_phase));
+
+	if (!len && !best_len)
+		return -EIO;
+
+	dev_dbg(mmc_dev(mmc), "Tuned RX clock phase to %u\n", new_phase);
+
+	return 0;
+}
+
+static const struct mmc_host_ops meson_mx_sdhc_ops = {
+	.card_hw_reset			= meson_mx_sdhc_hw_reset,
+	.request			= meson_mx_sdhc_request,
+	.set_ios			= meson_mx_sdhc_set_ios,
+	.card_busy			= meson_mx_sdhc_card_busy,
+	.execute_tuning			= meson_mx_sdhc_execute_tuning,
+	.get_cd				= mmc_gpio_get_cd,
+	.get_ro				= mmc_gpio_get_ro,
+};
+
+static void meson_mx_sdhc_request_done(struct meson_mx_sdhc_host *host)
+{
+	struct mmc_request *mrq = host->mrq;
+	struct mmc_host *mmc = host->mmc;
+
+	/* disable interrupts and mask all pending ones */
+	regmap_update_bits(host->regmap, MESON_SDHC_ICTL,
+			   MESON_SDHC_ICTL_ALL_IRQS, 0);
+	regmap_update_bits(host->regmap, MESON_SDHC_ISTA,
+			   MESON_SDHC_ISTA_ALL_IRQS, MESON_SDHC_ISTA_ALL_IRQS);
+
+	host->mrq = NULL;
+	host->cmd = NULL;
+
+	mmc_request_done(mmc, mrq);
+}
+
+static u32 meson_mx_sdhc_read_response(struct meson_mx_sdhc_host *host, u8 idx)
+{
+	u32 val;
+
+	regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+			   MESON_SDHC_PDMA_DMA_MODE, 0);
+
+	regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+			   MESON_SDHC_PDMA_PIO_RDRESP,
+			   FIELD_PREP(MESON_SDHC_PDMA_PIO_RDRESP, idx));
+
+	regmap_read(host->regmap, MESON_SDHC_ARGU, &val);
+
+	return val;
+}
+
+static irqreturn_t meson_mx_sdhc_irq(int irq, void *data)
+{
+	struct meson_mx_sdhc_host *host = data;
+	struct mmc_command *cmd = host->cmd;
+	u32 ictl, ista;
+
+	regmap_read(host->regmap, MESON_SDHC_ICTL, &ictl);
+	regmap_read(host->regmap, MESON_SDHC_ISTA, &ista);
+
+	if (!(ictl & ista))
+		return IRQ_NONE;
+
+	if (ista & MESON_SDHC_ISTA_RXFIFO_FULL ||
+	    ista & MESON_SDHC_ISTA_TXFIFO_EMPTY)
+		cmd->error = -EIO;
+	else if (ista & MESON_SDHC_ISTA_RESP_ERR_CRC)
+		cmd->error = -EILSEQ;
+	else if (ista & MESON_SDHC_ISTA_RESP_TIMEOUT)
+		cmd->error = -ETIMEDOUT;
+
+	if (cmd->data) {
+		if (ista & MESON_SDHC_ISTA_DATA_ERR_CRC)
+			cmd->data->error = -EILSEQ;
+		else if (ista & MESON_SDHC_ISTA_DATA_TIMEOUT)
+			cmd->data->error = -ETIMEDOUT;
+	}
+
+	if (cmd->error || (cmd->data && cmd->data->error))
+		dev_dbg(mmc_dev(host->mmc), "CMD%d error, ISTA: 0x%08x\n",
+			cmd->opcode, ista);
+
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t meson_mx_sdhc_irq_thread(int irq, void *irq_data)
+{
+	struct meson_mx_sdhc_host *host = irq_data;
+	struct mmc_command *cmd;
+	u32 val;
+
+	cmd = host->cmd;
+	if (WARN_ON(!cmd))
+		return IRQ_HANDLED;
+
+	if (cmd->data && !cmd->data->error) {
+		if (!host->platform->hardware_flush_all_cmds &&
+		    cmd->data->flags & MMC_DATA_READ) {
+			meson_mx_sdhc_wait_cmd_ready(host->mmc);
+
+			/*
+			 * If MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH was
+			 * previously 0x1 then it has to be set to 0x3. If it
+			 * was 0x0 before then it has to be set to 0x2. Without
+			 * this reading SD cards sometimes transfers garbage,
+			 * which results in cards not being detected due to:
+			 *   unrecognised SCR structure version <random number>
+			 */
+			val = FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
+					 2);
+			regmap_update_bits(host->regmap, MESON_SDHC_PDMA, val,
+					   val);
+		}
+
+		dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg,
+			     cmd->data->sg_len, mmc_get_dma_dir(cmd->data));
+
+		cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks;
+	}
+
+	meson_mx_sdhc_wait_cmd_ready(host->mmc);
+
+	if (cmd->flags & MMC_RSP_136) {
+		cmd->resp[0] = meson_mx_sdhc_read_response(host, 4);
+		cmd->resp[1] = meson_mx_sdhc_read_response(host, 3);
+		cmd->resp[2] = meson_mx_sdhc_read_response(host, 2);
+		cmd->resp[3] = meson_mx_sdhc_read_response(host, 1);
+	} else {
+		cmd->resp[0] = meson_mx_sdhc_read_response(host, 0);
+	}
+
+	if (cmd->error == -EIO || cmd->error == -ETIMEDOUT)
+		meson_mx_sdhc_hw_reset(host->mmc);
+	else if (cmd->data)
+		/*
+		 * Clear the FIFOs after completing data transfers to prevent
+		 * corrupting data on write access. It's not clear why this is
+		 * needed (for reads and writes), but it mimics what the BSP
+		 * kernel did.
+		 */
+		meson_mx_sdhc_clear_fifo(host->mmc);
+
+	meson_mx_sdhc_request_done(host);
+
+	return IRQ_HANDLED;
+}
+
+static void meson_mx_sdhc_init_hw_meson8(struct mmc_host *mmc)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+	regmap_write(host->regmap, MESON_SDHC_MISC,
+		     FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 7) |
+		     FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) |
+		     FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2));
+
+	regmap_write(host->regmap, MESON_SDHC_ENHC,
+		     FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 63) |
+		     MESON_SDHC_ENHC_MESON6_DMA_WR_RESP |
+		     FIELD_PREP(MESON_SDHC_ENHC_MESON6_RX_TIMEOUT, 255) |
+		     FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12));
+};
+
+static void meson_mx_sdhc_set_pdma_meson8(struct mmc_host *mmc)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+	if (host->cmd->data->flags & MMC_DATA_WRITE)
+		regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+				   MESON_SDHC_PDMA_DMA_MODE |
+				   MESON_SDHC_PDMA_RD_BURST |
+				   MESON_SDHC_PDMA_TXFIFO_FILL,
+				   MESON_SDHC_PDMA_DMA_MODE |
+				   FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 31) |
+				   MESON_SDHC_PDMA_TXFIFO_FILL);
+	else
+		regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+				   MESON_SDHC_PDMA_DMA_MODE |
+				   MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
+				   MESON_SDHC_PDMA_DMA_MODE |
+				   FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
+					      1));
+
+	if (host->cmd->data->flags & MMC_DATA_WRITE)
+		regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+				   MESON_SDHC_PDMA_RD_BURST,
+				   FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15));
+}
+
+static void meson_mx_sdhc_wait_before_send_meson8(struct mmc_host *mmc)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+	u32 val;
+	int ret;
+
+	ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, val,
+				       val == 0,
+				       MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US,
+				       MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US);
+	if (ret)
+		dev_warn(mmc_dev(mmc),
+			 "Failed to wait for ESTA to clear: 0x%08x\n", val);
+
+	if (host->cmd->data && host->cmd->data->flags & MMC_DATA_WRITE) {
+		ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT,
+					val, val & MESON_SDHC_STAT_TXFIFO_CNT,
+					MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US,
+					MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US);
+		if (ret)
+			dev_warn(mmc_dev(mmc),
+				 "Failed to wait for TX FIFO to fill\n");
+	}
+}
+
+static void meson_mx_sdhc_init_hw_meson8m2(struct mmc_host *mmc)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+	regmap_write(host->regmap, MESON_SDHC_MISC,
+		     FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 6) |
+		     FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) |
+		     FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2));
+
+	regmap_write(host->regmap, MESON_SDHC_ENHC,
+		     FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 64) |
+		     FIELD_PREP(MESON_SDHC_ENHC_MESON8M2_DEBUG, 1) |
+		     MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE |
+		     FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12));
+}
+
+static void meson_mx_sdhc_set_pdma_meson8m2(struct mmc_host *mmc)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+	regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+			   MESON_SDHC_PDMA_DMA_MODE, MESON_SDHC_PDMA_DMA_MODE);
+}
+
+static void meson_mx_sdhc_init_hw(struct mmc_host *mmc)
+{
+	struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+	meson_mx_sdhc_hw_reset(mmc);
+
+	regmap_write(host->regmap, MESON_SDHC_CTRL,
+		     FIELD_PREP(MESON_SDHC_CTRL_RX_PERIOD, 0xf) |
+		     FIELD_PREP(MESON_SDHC_CTRL_RX_TIMEOUT, 0x7f) |
+		     FIELD_PREP(MESON_SDHC_CTRL_RX_ENDIAN, 0x7) |
+		     FIELD_PREP(MESON_SDHC_CTRL_TX_ENDIAN, 0x7));
+
+	/*
+	 * start with a valid divider and enable the memory (un-setting
+	 * MESON_SDHC_CLKC_MEM_PWR_OFF).
+	 */
+	regmap_write(host->regmap, MESON_SDHC_CLKC, MESON_SDHC_CLKC_CLK_DIV);
+
+	regmap_write(host->regmap, MESON_SDHC_CLK2,
+		     FIELD_PREP(MESON_SDHC_CLK2_SD_CLK_PHASE, 1));
+
+	regmap_write(host->regmap, MESON_SDHC_PDMA,
+		     MESON_SDHC_PDMA_DMA_URGENT |
+		     FIELD_PREP(MESON_SDHC_PDMA_WR_BURST, 7) |
+		     FIELD_PREP(MESON_SDHC_PDMA_TXFIFO_TH, 49) |
+		     FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15) |
+		     FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_TH, 7));
+
+	/* some initialization bits depend on the SoC: */
+	host->platform->init_hw(mmc);
+
+	/* disable and mask all interrupts: */
+	regmap_write(host->regmap, MESON_SDHC_ICTL, 0);
+	regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
+}
+
+static void meason_mx_mmc_free_host(void *data)
+{
+       mmc_free_host(data);
+}
+
+static int meson_mx_sdhc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct meson_mx_sdhc_host *host;
+	struct mmc_host *mmc;
+	void __iomem *base;
+	int ret, irq;
+
+	mmc = mmc_alloc_host(sizeof(*host), dev);
+	if (!mmc)
+		return -ENOMEM;
+
+	ret = devm_add_action_or_reset(dev, meason_mx_mmc_free_host, mmc);
+	if (ret) {
+		dev_err(dev, "Failed to register mmc_free_host action\n");
+		return ret;
+	}
+
+	host = mmc_priv(mmc);
+	host->mmc = mmc;
+
+	platform_set_drvdata(pdev, host);
+
+	host->platform = device_get_match_data(dev);
+	if (!host->platform)
+		return -EINVAL;
+
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	host->regmap = devm_regmap_init_mmio(dev, base,
+					     &meson_mx_sdhc_regmap_config);
+	if (IS_ERR(host->regmap))
+		return PTR_ERR(host->regmap);
+
+	host->pclk = devm_clk_get(dev, "pclk");
+	if (IS_ERR(host->pclk))
+		return PTR_ERR(host->pclk);
+
+	/* accessing any register requires the module clock to be enabled: */
+	ret = clk_prepare_enable(host->pclk);
+	if (ret) {
+		dev_err(dev, "Failed to enable 'pclk' clock\n");
+		return ret;
+	}
+
+	meson_mx_sdhc_init_hw(mmc);
+
+	ret = meson_mx_sdhc_register_clkc(dev, base, host->bulk_clks);
+	if (ret)
+		goto err_disable_pclk;
+
+	host->sd_clk = host->bulk_clks[1].clk;
+
+	/* Get regulators and the supported OCR mask */
+	ret = mmc_regulator_get_supply(mmc);
+	if (ret)
+		goto err_disable_pclk;
+
+	mmc->max_req_size = SZ_128K;
+	mmc->max_seg_size = mmc->max_req_size;
+	mmc->max_blk_count = FIELD_GET(MESON_SDHC_SEND_TOTAL_PACK, ~0);
+	mmc->max_blk_size = MESON_SDHC_MAX_BLK_SIZE;
+	mmc->max_busy_timeout = 30 * MSEC_PER_SEC;
+	mmc->f_min = clk_round_rate(host->sd_clk, 1);
+	mmc->f_max = clk_round_rate(host->sd_clk, ULONG_MAX);
+	mmc->max_current_180 = 300;
+	mmc->max_current_330 = 300;
+	mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_HW_RESET;
+	mmc->ops = &meson_mx_sdhc_ops;
+
+	ret = mmc_of_parse(mmc);
+	if (ret)
+		goto err_disable_pclk;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		ret = irq;
+		goto err_disable_pclk;
+	}
+
+	ret = devm_request_threaded_irq(dev, irq, meson_mx_sdhc_irq,
+					meson_mx_sdhc_irq_thread, IRQF_ONESHOT,
+					NULL, host);
+	if (ret)
+		goto err_disable_pclk;
+
+	ret = mmc_add_host(mmc);
+	if (ret)
+		goto err_disable_pclk;
+
+	return 0;
+
+err_disable_pclk:
+	clk_disable_unprepare(host->pclk);
+	return ret;
+}
+
+static void meson_mx_sdhc_remove(struct platform_device *pdev)
+{
+	struct meson_mx_sdhc_host *host = platform_get_drvdata(pdev);
+
+	mmc_remove_host(host->mmc);
+
+	meson_mx_sdhc_disable_clks(host->mmc);
+
+	clk_disable_unprepare(host->pclk);
+}
+
+static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8 = {
+	.init_hw			= meson_mx_sdhc_init_hw_meson8,
+	.set_pdma			= meson_mx_sdhc_set_pdma_meson8,
+	.wait_before_send		= meson_mx_sdhc_wait_before_send_meson8,
+	.hardware_flush_all_cmds	= false,
+};
+
+static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8m2 = {
+	.init_hw			= meson_mx_sdhc_init_hw_meson8m2,
+	.set_pdma			= meson_mx_sdhc_set_pdma_meson8m2,
+	.hardware_flush_all_cmds	= true,
+};
+
+static const struct of_device_id meson_mx_sdhc_of_match[] = {
+	{
+		.compatible = "amlogic,meson8-sdhc",
+		.data = &meson_mx_sdhc_data_meson8
+	},
+	{
+		.compatible = "amlogic,meson8b-sdhc",
+		.data = &meson_mx_sdhc_data_meson8
+	},
+	{
+		.compatible = "amlogic,meson8m2-sdhc",
+		.data = &meson_mx_sdhc_data_meson8m2
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, meson_mx_sdhc_of_match);
+
+static struct platform_driver meson_mx_sdhc_driver = {
+	.probe   = meson_mx_sdhc_probe,
+	.remove_new = meson_mx_sdhc_remove,
+	.driver  = {
+		.name = "meson-mx-sdhc",
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		.of_match_table = of_match_ptr(meson_mx_sdhc_of_match),
+	},
+};
+
+module_platform_driver(meson_mx_sdhc_driver);
+
+MODULE_DESCRIPTION("Meson6, Meson8, Meson8b and Meson8m2 SDHC Host Driver");
+MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
+MODULE_LICENSE("GPL v2");