mmc: Add Marvell Xenon SDHCI controller driver

This driver implementes platform specific code for the Xenon SDHCI
controller which is integrated in the Marvell MVEBU Armada 37xx and
Armada 7k / 8K SoCs.

History:
This driver is ported from the Marvell U-Boot version 2015.01 which is
written by Victor Gu <xigu@marvell.com> with minor changes ported from
the Linux driver which is written by Ziji Hu <huziji@marvell.com>.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

1 files changed, 497 insertions, 0 deletions

diff --git a/drivers/mmc/xenon_sdhci.c b/drivers/mmc/xenon_sdhci.c
new file mode 100644
index 0000000000..828da111c8
--- /dev/null
+++ b/drivers/mmc/xenon_sdhci.c
@@ -0,0 +1,497 @@
+/*
+ * Driver for Marvell SOC Platform Group Xenon SDHC as a platform device
+ *
+ * Copyright (C) 2016 Marvell, All Rights Reserved.
+ *
+ * Author:	Victor Gu <xigu@marvell.com>
+ * Date:	2016-8-24
+ *
+ * Included parts of the Linux driver version which was written by:
+ * Hu Ziji <huziji@marvell.com>
+ *
+ * Ported to from Marvell 2015.01 to mainline U-Boot 2017.01:
+ * Stefan Roese <sr@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <libfdt.h>
+#include <malloc.h>
+#include <sdhci.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Register Offset of SD Host Controller SOCP self-defined register */
+#define SDHC_SYS_CFG_INFO			0x0104
+#define SLOT_TYPE_SDIO_SHIFT			24
+#define SLOT_TYPE_EMMC_MASK			0xFF
+#define SLOT_TYPE_EMMC_SHIFT			16
+#define SLOT_TYPE_SD_SDIO_MMC_MASK		0xFF
+#define SLOT_TYPE_SD_SDIO_MMC_SHIFT		8
+#define NR_SUPPORTED_SLOT_MASK			0x7
+
+#define SDHC_SYS_OP_CTRL			0x0108
+#define AUTO_CLKGATE_DISABLE_MASK		BIT(20)
+#define SDCLK_IDLEOFF_ENABLE_SHIFT		8
+#define SLOT_ENABLE_SHIFT			0
+
+#define SDHC_SYS_EXT_OP_CTRL			0x010C
+#define MASK_CMD_CONFLICT_ERROR			BIT(8)
+
+#define SDHC_SLOT_RETUNING_REQ_CTRL		0x0144
+/* retuning compatible */
+#define RETUNING_COMPATIBLE			0x1
+
+/* Xenon specific Mode Select value */
+#define XENON_SDHCI_CTRL_HS200			0x5
+#define XENON_SDHCI_CTRL_HS400			0x6
+
+#define EMMC_PHY_REG_BASE			0x170
+#define EMMC_PHY_TIMING_ADJUST			EMMC_PHY_REG_BASE
+#define OUTPUT_QSN_PHASE_SELECT			BIT(17)
+#define SAMPL_INV_QSP_PHASE_SELECT		BIT(18)
+#define SAMPL_INV_QSP_PHASE_SELECT_SHIFT	18
+#define EMMC_PHY_SLOW_MODE			BIT(29)
+#define PHY_INITIALIZAION			BIT(31)
+#define WAIT_CYCLE_BEFORE_USING_MASK		0xf
+#define WAIT_CYCLE_BEFORE_USING_SHIFT		12
+#define FC_SYNC_EN_DURATION_MASK		0xf
+#define FC_SYNC_EN_DURATION_SHIFT		8
+#define FC_SYNC_RST_EN_DURATION_MASK		0xf
+#define FC_SYNC_RST_EN_DURATION_SHIFT		4
+#define FC_SYNC_RST_DURATION_MASK		0xf
+#define FC_SYNC_RST_DURATION_SHIFT		0
+
+#define EMMC_PHY_FUNC_CONTROL			(EMMC_PHY_REG_BASE + 0x4)
+#define DQ_ASYNC_MODE				BIT(4)
+#define DQ_DDR_MODE_SHIFT			8
+#define DQ_DDR_MODE_MASK			0xff
+#define CMD_DDR_MODE				BIT(16)
+
+#define EMMC_PHY_PAD_CONTROL			(EMMC_PHY_REG_BASE + 0x8)
+#define REC_EN_SHIFT				24
+#define REC_EN_MASK				0xf
+#define FC_DQ_RECEN				BIT(24)
+#define FC_CMD_RECEN				BIT(25)
+#define FC_QSP_RECEN				BIT(26)
+#define FC_QSN_RECEN				BIT(27)
+#define OEN_QSN					BIT(28)
+#define AUTO_RECEN_CTRL				BIT(30)
+
+#define EMMC_PHY_PAD_CONTROL1			(EMMC_PHY_REG_BASE + 0xc)
+#define EMMC5_1_FC_QSP_PD			BIT(9)
+#define EMMC5_1_FC_QSP_PU			BIT(25)
+#define EMMC5_1_FC_CMD_PD			BIT(8)
+#define EMMC5_1_FC_CMD_PU			BIT(24)
+#define EMMC5_1_FC_DQ_PD			0xff
+#define EMMC5_1_FC_DQ_PU			(0xff << 16)
+
+#define SDHCI_RETUNE_EVT_INTSIG			0x00001000
+
+/* Hyperion only have one slot 0 */
+#define XENON_MMC_SLOT_ID_HYPERION		0
+
+#define MMC_TIMING_LEGACY	0
+#define MMC_TIMING_MMC_HS	1
+#define MMC_TIMING_SD_HS	2
+#define MMC_TIMING_UHS_SDR12	3
+#define MMC_TIMING_UHS_SDR25	4
+#define MMC_TIMING_UHS_SDR50	5
+#define MMC_TIMING_UHS_SDR104	6
+#define MMC_TIMING_UHS_DDR50	7
+#define MMC_TIMING_MMC_DDR52	8
+#define MMC_TIMING_MMC_HS200	9
+#define MMC_TIMING_MMC_HS400	10
+
+#define XENON_MMC_MAX_CLK	400000000
+
+enum soc_pad_ctrl_type {
+	SOC_PAD_SD,
+	SOC_PAD_FIXED_1_8V,
+};
+
+struct xenon_sdhci_plat {
+	struct mmc_config cfg;
+	struct mmc mmc;
+};
+
+struct xenon_sdhci_priv {
+	struct sdhci_host host;
+
+	u8 timing;
+
+	unsigned int clock;
+
+	void *pad_ctrl_reg;
+	int pad_type;
+};
+
+static int xenon_mmc_phy_init(struct sdhci_host *host)
+{
+	struct xenon_sdhci_priv *priv = host->mmc->priv;
+	u32 clock = priv->clock;
+	u32 time;
+	u32 var;
+
+	/* Enable QSP PHASE SELECT */
+	var = sdhci_readl(host, EMMC_PHY_TIMING_ADJUST);
+	var |= SAMPL_INV_QSP_PHASE_SELECT;
+	if ((priv->timing == MMC_TIMING_UHS_SDR50) ||
+	    (priv->timing == MMC_TIMING_UHS_SDR25) ||
+	    (priv->timing == MMC_TIMING_UHS_SDR12) ||
+	    (priv->timing == MMC_TIMING_SD_HS) ||
+	    (priv->timing == MMC_TIMING_LEGACY))
+		var |= EMMC_PHY_SLOW_MODE;
+	sdhci_writel(host, var, EMMC_PHY_TIMING_ADJUST);
+
+	/* Poll for host MMC PHY clock init to be stable */
+	/* Wait up to 10ms */
+	time = 100;
+	while (time--) {
+		var = sdhci_readl(host, SDHCI_CLOCK_CONTROL);
+		if (var & SDHCI_CLOCK_INT_STABLE)
+			break;
+
+		udelay(100);
+	}
+
+	if (time <= 0) {
+		error("Failed to enable MMC internal clock in time\n");
+		return -ETIMEDOUT;
+	}
+
+	/* Init PHY */
+	var = sdhci_readl(host, EMMC_PHY_TIMING_ADJUST);
+	var |= PHY_INITIALIZAION;
+	sdhci_writel(host, var, EMMC_PHY_TIMING_ADJUST);
+
+	if (clock == 0) {
+		/* Use the possibly slowest bus frequency value */
+		clock = 100000;
+	}
+
+	/* Poll for host eMMC PHY init to complete */
+	/* Wait up to 10ms */
+	time = 100;
+	while (time--) {
+		var = sdhci_readl(host, EMMC_PHY_TIMING_ADJUST);
+		var &= PHY_INITIALIZAION;
+		if (!var)
+			break;
+
+		/* wait for host eMMC PHY init to complete */
+		udelay(100);
+	}
+
+	if (time <= 0) {
+		error("Failed to init MMC PHY in time\n");
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+#define ARMADA_3700_SOC_PAD_1_8V	0x1
+#define ARMADA_3700_SOC_PAD_3_3V	0x0
+
+static void armada_3700_soc_pad_voltage_set(struct sdhci_host *host)
+{
+	struct xenon_sdhci_priv *priv = host->mmc->priv;
+
+	if (priv->pad_type == SOC_PAD_FIXED_1_8V)
+		writel(ARMADA_3700_SOC_PAD_1_8V, priv->pad_ctrl_reg);
+	else if (priv->pad_type == SOC_PAD_SD)
+		writel(ARMADA_3700_SOC_PAD_3_3V, priv->pad_ctrl_reg);
+}
+
+static void xenon_mmc_phy_set(struct sdhci_host *host)
+{
+	struct xenon_sdhci_priv *priv = host->mmc->priv;
+	u32 var;
+
+	/* Setup pad, set bit[30], bit[28] and bits[26:24] */
+	var = sdhci_readl(host, EMMC_PHY_PAD_CONTROL);
+	var |= AUTO_RECEN_CTRL | OEN_QSN | FC_QSP_RECEN |
+		FC_CMD_RECEN | FC_DQ_RECEN;
+	sdhci_writel(host, var, EMMC_PHY_PAD_CONTROL);
+
+	/* Set CMD and DQ Pull Up */
+	var = sdhci_readl(host, EMMC_PHY_PAD_CONTROL1);
+	var |= (EMMC5_1_FC_CMD_PU | EMMC5_1_FC_DQ_PU);
+	var &= ~(EMMC5_1_FC_CMD_PD | EMMC5_1_FC_DQ_PD);
+	sdhci_writel(host, var, EMMC_PHY_PAD_CONTROL1);
+
+	/*
+	 * If timing belongs to high speed, set bit[17] of
+	 * EMMC_PHY_TIMING_ADJUST register
+	 */
+	if ((priv->timing == MMC_TIMING_MMC_HS400) ||
+	    (priv->timing == MMC_TIMING_MMC_HS200) ||
+	    (priv->timing == MMC_TIMING_UHS_SDR50) ||
+	    (priv->timing == MMC_TIMING_UHS_SDR104) ||
+	    (priv->timing == MMC_TIMING_UHS_DDR50) ||
+	    (priv->timing == MMC_TIMING_UHS_SDR25) ||
+	    (priv->timing == MMC_TIMING_MMC_DDR52)) {
+		var = sdhci_readl(host, EMMC_PHY_TIMING_ADJUST);
+		var |= OUTPUT_QSN_PHASE_SELECT;
+		sdhci_writel(host, var, EMMC_PHY_TIMING_ADJUST);
+	}
+
+	/*
+	 * When setting EMMC_PHY_FUNC_CONTROL register,
+	 * SD clock should be disabled
+	 */
+	var = sdhci_readl(host, SDHCI_CLOCK_CONTROL);
+	var &= ~SDHCI_CLOCK_CARD_EN;
+	sdhci_writew(host, var, SDHCI_CLOCK_CONTROL);
+
+	var = sdhci_readl(host, EMMC_PHY_FUNC_CONTROL);
+	if (host->mmc->ddr_mode) {
+		var |= (DQ_DDR_MODE_MASK << DQ_DDR_MODE_SHIFT) | CMD_DDR_MODE;
+	} else {
+		var &= ~((DQ_DDR_MODE_MASK << DQ_DDR_MODE_SHIFT) |
+			 CMD_DDR_MODE);
+	}
+	sdhci_writel(host, var, EMMC_PHY_FUNC_CONTROL);
+
+	/* Enable bus clock */
+	var = sdhci_readl(host, SDHCI_CLOCK_CONTROL);
+	var |= SDHCI_CLOCK_CARD_EN;
+	sdhci_writew(host, var, SDHCI_CLOCK_CONTROL);
+
+	xenon_mmc_phy_init(host);
+}
+
+/* Enable/Disable the Auto Clock Gating function of this slot */
+static void xenon_mmc_set_acg(struct sdhci_host *host, bool enable)
+{
+	u32 var;
+
+	var = sdhci_readl(host, SDHC_SYS_OP_CTRL);
+	if (enable)
+		var &= ~AUTO_CLKGATE_DISABLE_MASK;
+	else
+		var |= AUTO_CLKGATE_DISABLE_MASK;
+
+	sdhci_writel(host, var, SDHC_SYS_OP_CTRL);
+}
+
+#define SLOT_MASK(slot)		BIT(slot)
+
+/* Enable specific slot */
+static void xenon_mmc_enable_slot(struct sdhci_host *host, u8 slot)
+{
+	u32 var;
+
+	var = sdhci_readl(host, SDHC_SYS_OP_CTRL);
+	var |= SLOT_MASK(slot) << SLOT_ENABLE_SHIFT;
+	sdhci_writel(host, var, SDHC_SYS_OP_CTRL);
+}
+
+/* Enable Parallel Transfer Mode */
+static void xenon_mmc_enable_parallel_tran(struct sdhci_host *host, u8 slot)
+{
+	u32 var;
+
+	var = sdhci_readl(host, SDHC_SYS_EXT_OP_CTRL);
+	var |= SLOT_MASK(slot);
+	sdhci_writel(host, var, SDHC_SYS_EXT_OP_CTRL);
+}
+
+static void xenon_mmc_disable_tuning(struct sdhci_host *host, u8 slot)
+{
+	u32 var;
+
+	/* Clear the Re-Tuning Request functionality */
+	var = sdhci_readl(host, SDHC_SLOT_RETUNING_REQ_CTRL);
+	var &= ~RETUNING_COMPATIBLE;
+	sdhci_writel(host, var, SDHC_SLOT_RETUNING_REQ_CTRL);
+
+	/* Clear the Re-tuning Event Signal Enable */
+	var = sdhci_readl(host, SDHCI_SIGNAL_ENABLE);
+	var &= ~SDHCI_RETUNE_EVT_INTSIG;
+	sdhci_writel(host, var, SDHCI_SIGNAL_ENABLE);
+}
+
+/* Mask command conflict error */
+static void xenon_mask_cmd_conflict_err(struct sdhci_host *host)
+{
+	u32  reg;
+
+	reg = sdhci_readl(host, SDHC_SYS_EXT_OP_CTRL);
+	reg |= MASK_CMD_CONFLICT_ERROR;
+	sdhci_writel(host, reg, SDHC_SYS_EXT_OP_CTRL);
+}
+
+/* Platform specific function for post set_ios configuration */
+static void xenon_sdhci_set_ios_post(struct sdhci_host *host)
+{
+	struct xenon_sdhci_priv *priv = host->mmc->priv;
+	uint speed = host->mmc->tran_speed;
+	int pwr_18v = 0;
+
+	if ((sdhci_readb(host, SDHCI_POWER_CONTROL) & ~SDHCI_POWER_ON) ==
+	    SDHCI_POWER_180)
+		pwr_18v = 1;
+
+	/* Set timing variable according to the configured speed */
+	if (IS_SD(host->mmc)) {
+		/* SD/SDIO */
+		if (pwr_18v) {
+			if (host->mmc->ddr_mode)
+				priv->timing = MMC_TIMING_UHS_DDR50;
+			else if (speed <= 25000000)
+				priv->timing = MMC_TIMING_UHS_SDR25;
+			else
+				priv->timing = MMC_TIMING_UHS_SDR50;
+		} else {
+			if (speed <= 25000000)
+				priv->timing = MMC_TIMING_LEGACY;
+			else
+				priv->timing = MMC_TIMING_SD_HS;
+		}
+	} else {
+		/* eMMC */
+		if (host->mmc->ddr_mode)
+			priv->timing = MMC_TIMING_MMC_DDR52;
+		else if (speed <= 26000000)
+			priv->timing = MMC_TIMING_LEGACY;
+		else
+			priv->timing = MMC_TIMING_MMC_HS;
+	}
+
+	/* Re-init the PHY */
+	xenon_mmc_phy_set(host);
+}
+
+/* Install a driver specific handler for post set_ios configuration */
+static const struct sdhci_ops xenon_sdhci_ops = {
+	.set_ios_post = xenon_sdhci_set_ios_post
+};
+
+static int xenon_sdhci_probe(struct udevice *dev)
+{
+	struct xenon_sdhci_plat *plat = dev_get_platdata(dev);
+	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+	struct xenon_sdhci_priv *priv = dev_get_priv(dev);
+	struct sdhci_host *host = dev_get_priv(dev);
+	int ret;
+
+	host->mmc = &plat->mmc;
+	host->mmc->priv = host;
+	host->mmc->dev = dev;
+	upriv->mmc = host->mmc;
+
+	/* Set quirks */
+	host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_32BIT_DMA_ADDR;
+
+	/* Set default timing */
+	priv->timing = MMC_TIMING_LEGACY;
+
+	/* Disable auto clock gating during init */
+	xenon_mmc_set_acg(host, false);
+
+	/* Enable slot */
+	xenon_mmc_enable_slot(host, XENON_MMC_SLOT_ID_HYPERION);
+
+	/*
+	 * Set default power on SoC PHY PAD register (currently only
+	 * available on the Armada 3700)
+	 */
+	if (priv->pad_ctrl_reg)
+		armada_3700_soc_pad_voltage_set(host);
+
+	host->host_caps = MMC_MODE_HS | MMC_MODE_HS_52MHz | MMC_MODE_DDR_52MHz;
+	switch (fdtdec_get_int(gd->fdt_blob, dev->of_offset, "bus-width", 1)) {
+	case 8:
+		host->host_caps |= MMC_MODE_8BIT;
+		break;
+	case 4:
+		host->host_caps |= MMC_MODE_4BIT;
+		break;
+	case 1:
+		break;
+	default:
+		printf("Invalid \"bus-width\" value\n");
+		return -EINVAL;
+	}
+
+	host->ops = &xenon_sdhci_ops;
+
+	ret = sdhci_setup_cfg(&plat->cfg, host, XENON_MMC_MAX_CLK, 0);
+	if (ret)
+		return ret;
+
+	ret = sdhci_probe(dev);
+	if (ret)
+		return ret;
+
+	/* Enable parallel transfer */
+	xenon_mmc_enable_parallel_tran(host, XENON_MMC_SLOT_ID_HYPERION);
+
+	/* Disable tuning functionality of this slot */
+	xenon_mmc_disable_tuning(host, XENON_MMC_SLOT_ID_HYPERION);
+
+	/* Enable auto clock gating after init */
+	xenon_mmc_set_acg(host, true);
+
+	xenon_mask_cmd_conflict_err(host);
+
+	return ret;
+}
+
+static int xenon_sdhci_ofdata_to_platdata(struct udevice *dev)
+{
+	struct sdhci_host *host = dev_get_priv(dev);
+	struct xenon_sdhci_priv *priv = dev_get_priv(dev);
+	const char *name;
+
+	host->name = dev->name;
+	host->ioaddr = (void *)dev_get_addr(dev);
+
+	if (of_device_is_compatible(dev, "marvell,armada-3700-sdhci"))
+		priv->pad_ctrl_reg = (void *)dev_get_addr_index(dev, 1);
+
+	name = fdt_getprop(gd->fdt_blob, dev->of_offset, "marvell,pad-type",
+			   NULL);
+	if (name) {
+		if (0 == strncmp(name, "sd", 2)) {
+			priv->pad_type = SOC_PAD_SD;
+		} else if (0 == strncmp(name, "fixed-1-8v", 10)) {
+			priv->pad_type = SOC_PAD_FIXED_1_8V;
+		} else {
+			printf("Unsupported SOC PHY PAD ctrl type %s\n", name);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int xenon_sdhci_bind(struct udevice *dev)
+{
+	struct xenon_sdhci_plat *plat = dev_get_platdata(dev);
+
+	return sdhci_bind(dev, &plat->mmc, &plat->cfg);
+}
+
+static const struct udevice_id xenon_sdhci_ids[] = {
+	{ .compatible = "marvell,armada-8k-sdhci",},
+	{ .compatible = "marvell,armada-3700-sdhci",},
+	{ }
+};
+
+U_BOOT_DRIVER(xenon_sdhci_drv) = {
+	.name		= "xenon_sdhci",
+	.id		= UCLASS_MMC,
+	.of_match	= xenon_sdhci_ids,
+	.ofdata_to_platdata = xenon_sdhci_ofdata_to_platdata,
+	.ops		= &sdhci_ops,
+	.bind		= xenon_sdhci_bind,
+	.probe		= xenon_sdhci_probe,
+	.priv_auto_alloc_size = sizeof(struct xenon_sdhci_priv),
+	.platdata_auto_alloc_size = sizeof(struct xenon_sdhci_plat),
+};