drivers/mmc/msm_sdhci.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Qualcomm SDHCI driver - SD/eMMC controller
  *
  * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
  *
  * Based on Linux driver
  */

 #include <common.h>
 #include <clk.h>
 #include <dm.h>
 #include <malloc.h>
 #include <sdhci.h>
 #include <wait_bit.h>
 #include <asm/global_data.h>
 #include <asm/io.h>
 #include <linux/bitops.h>

 /* Non-standard registers needed for SDHCI startup */
 #define SDCC_MCI_POWER   0x0
 #define SDCC_MCI_POWER_SW_RST BIT(7)

 /* This is undocumented register */
 #define SDCC_MCI_VERSION		0x50
 #define SDCC_V5_VERSION			0x318

 #define SDCC_VERSION_MAJOR_SHIFT	28
 #define SDCC_VERSION_MAJOR_MASK		(0xf << SDCC_VERSION_MAJOR_SHIFT)
 #define SDCC_VERSION_MINOR_MASK		0xff

 #define SDCC_MCI_STATUS2 0x6C
 #define SDCC_MCI_STATUS2_MCI_ACT 0x1
 #define SDCC_MCI_HC_MODE 0x78

 /* Non standard (?) SDHCI register */
 #define SDHCI_VENDOR_SPEC_CAPABILITIES0  0x11c

 struct msm_sdhc_plat {
 	struct mmc_config cfg;
 	struct mmc mmc;
 };

 struct msm_sdhc {
 	struct sdhci_host host;
 	void *base;
 	struct clk_bulk clks;
 };

 struct msm_sdhc_variant_info {
 	bool mci_removed;
 };

 DECLARE_GLOBAL_DATA_PTR;

 static int msm_sdc_clk_init(struct udevice *dev)
 {
 	struct msm_sdhc *prv = dev_get_priv(dev);
 	ofnode node = dev_ofnode(dev);
 	ulong clk_rate;
 	int ret, i = 0, n_clks;
 	const char *clk_name;

 	ret = ofnode_read_u32(node, "clock-frequency", (uint *)(&clk_rate));
 	if (ret)
 		clk_rate = 400000;

 	ret = clk_get_bulk(dev, &prv->clks);
 	if (ret) {
 		log_warning("Couldn't get mmc clocks: %d\n", ret);
 		return ret;
 	}

 	ret = clk_enable_bulk(&prv->clks);
 	if (ret) {
 		log_warning("Couldn't enable mmc clocks: %d\n", ret);
 		return ret;
 	}

 	/* If clock-names is unspecified, then the first clock is the core clock */
 	if (!ofnode_get_property(node, "clock-names", &n_clks)) {
 		if (!clk_set_rate(&prv->clks.clks[0], clk_rate)) {
 			log_warning("Couldn't set core clock rate: %d\n", ret);
 			return -EINVAL;
 		}
 	}

 	/* Find the index of the "core" clock */
 	while (i < n_clks) {
 		ofnode_read_string_index(node, "clock-names", i, &clk_name);
 		if (!strcmp(clk_name, "core"))
 			break;
 		i++;
 	}

 	if (i >= prv->clks.count) {
 		log_warning("Couldn't find core clock (index %d but only have %d clocks)\n", i,
 		       prv->clks.count);
 		return -EINVAL;
 	}

 	/* The clock is already enabled by the clk_bulk above */
 	clk_rate = clk_set_rate(&prv->clks.clks[i], clk_rate);
 	/* If we get a rate of 0 then something has probably gone wrong. */
 	if (clk_rate == 0 || IS_ERR((void *)clk_rate)) {
 		log_warning("Couldn't set MMC core clock rate: %dE\n", clk_rate ? (int)PTR_ERR((void *)clk_rate) : 0);
 		return -EINVAL;
 	}

 	return 0;
 }

 static int msm_sdc_mci_init(struct msm_sdhc *prv)
 {
 	/* Reset the core and Enable SDHC mode */
 	writel(readl(prv->base + SDCC_MCI_POWER) | SDCC_MCI_POWER_SW_RST,
 	       prv->base + SDCC_MCI_POWER);


 	/* Wait for reset to be written to register */
 	if (wait_for_bit_le32(prv->base + SDCC_MCI_STATUS2,
 			      SDCC_MCI_STATUS2_MCI_ACT, false, 10, false)) {
 		printf("msm_sdhci: reset request failed\n");
 		return -EIO;
 	}

 	/* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */
 	if (wait_for_bit_le32(prv->base + SDCC_MCI_POWER,
 			      SDCC_MCI_POWER_SW_RST, false, 2, false)) {
 		printf("msm_sdhci: stuck in reset\n");
 		return -ETIMEDOUT;
 	}

 	/* Enable host-controller mode */
 	writel(1, prv->base + SDCC_MCI_HC_MODE);

 	return 0;
 }

 static int msm_sdc_probe(struct udevice *dev)
 {
 	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 	struct msm_sdhc_plat *plat = dev_get_plat(dev);
 	struct msm_sdhc *prv = dev_get_priv(dev);
 	const struct msm_sdhc_variant_info *var_info;
 	struct sdhci_host *host = &prv->host;
 	u32 core_version, core_minor, core_major;
 	u32 caps;
 	int ret;

 	host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_BROKEN_R1B;

 	host->max_clk = 0;

 	/* Init clocks */
 	ret = msm_sdc_clk_init(dev);
 	if (ret)
 		return ret;

 	var_info = (void *)dev_get_driver_data(dev);
 	if (!var_info->mci_removed) {
 		ret = msm_sdc_mci_init(prv);
 		if (ret)
 			return ret;
 	}

 	if (!var_info->mci_removed)
 		core_version = readl(prv->base + SDCC_MCI_VERSION);
 	else
 		core_version = readl(host->ioaddr + SDCC_V5_VERSION);

 	core_major = (core_version & SDCC_VERSION_MAJOR_MASK);
 	core_major >>= SDCC_VERSION_MAJOR_SHIFT;

 	core_minor = core_version & SDCC_VERSION_MINOR_MASK;

 	/*
 	 * Support for some capabilities is not advertised by newer
 	 * controller versions and must be explicitly enabled.
 	 */
 	if (core_major >= 1 && core_minor != 0x11 && core_minor != 0x12) {
 		caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
 		caps |= SDHCI_CAN_VDD_300 | SDHCI_CAN_DO_8BIT;
 		writel(caps, host->ioaddr + SDHCI_VENDOR_SPEC_CAPABILITIES0);
 	}

 	ret = mmc_of_parse(dev, &plat->cfg);
 	if (ret)
 		return ret;

 	host->mmc = &plat->mmc;
 	host->mmc->dev = dev;
 	ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
 	if (ret)
 		return ret;
 	host->mmc->priv = &prv->host;
 	upriv->mmc = host->mmc;

 	return sdhci_probe(dev);
 }

 static int msm_sdc_remove(struct udevice *dev)
 {
 	struct msm_sdhc *priv = dev_get_priv(dev);
 	const struct msm_sdhc_variant_info *var_info;

 	var_info = (void *)dev_get_driver_data(dev);

 	/* Disable host-controller mode */
 	if (!var_info->mci_removed)
 		writel(0, priv->base + SDCC_MCI_HC_MODE);

 	clk_release_bulk(&priv->clks);

 	return 0;
 }

 static int msm_of_to_plat(struct udevice *dev)
 {
 	struct udevice *parent = dev->parent;
 	struct msm_sdhc *priv = dev_get_priv(dev);
 	struct sdhci_host *host = &priv->host;
 	int node = dev_of_offset(dev);

 	host->name = strdup(dev->name);
 	host->ioaddr = dev_read_addr_ptr(dev);
 	host->bus_width = fdtdec_get_int(gd->fdt_blob, node, "bus-width", 4);
 	host->index = fdtdec_get_uint(gd->fdt_blob, node, "index", 0);
 	priv->base = (void *)fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
 			dev_of_offset(parent), node, "reg", 1, NULL, false);
 	if (priv->base == (void *)FDT_ADDR_T_NONE ||
 	    host->ioaddr == (void *)FDT_ADDR_T_NONE)
 		return -EINVAL;

 	return 0;
 }

 static int msm_sdc_bind(struct udevice *dev)
 {
 	struct msm_sdhc_plat *plat = dev_get_plat(dev);

 	return sdhci_bind(dev, &plat->mmc, &plat->cfg);
 }

 static const struct msm_sdhc_variant_info msm_sdhc_mci_var = {
 	.mci_removed = false,
 };

 static const struct msm_sdhc_variant_info msm_sdhc_v5_var = {
 	.mci_removed = true,
 };

 static const struct udevice_id msm_mmc_ids[] = {
 	{ .compatible = "qcom,sdhci-msm-v4", .data = (ulong)&msm_sdhc_mci_var },
 	{ .compatible = "qcom,sdhci-msm-v5", .data = (ulong)&msm_sdhc_v5_var },
 	{ }
 };

 U_BOOT_DRIVER(msm_sdc_drv) = {
 	.name		= "msm_sdc",
 	.id		= UCLASS_MMC,
 	.of_match	= msm_mmc_ids,
 	.of_to_plat = msm_of_to_plat,
 	.ops		= &sdhci_ops,
 	.bind		= msm_sdc_bind,
 	.probe		= msm_sdc_probe,
 	.remove		= msm_sdc_remove,
 	.priv_auto	= sizeof(struct msm_sdhc),
 	.plat_auto	= sizeof(struct msm_sdhc_plat),
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Qualcomm SDHCI driver - SD/eMMC controller
	*
	* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
	*
	* Based on Linux driver
	*/

	#include <common.h>
	#include <clk.h>
	#include <dm.h>
	#include <malloc.h>
	#include <sdhci.h>
	#include <wait_bit.h>
	#include <asm/global_data.h>
	#include <asm/io.h>
	#include <linux/bitops.h>

	/* Non-standard registers needed for SDHCI startup */
	#define SDCC_MCI_POWER 0x0
	#define SDCC_MCI_POWER_SW_RST BIT(7)

	/* This is undocumented register */
	#define SDCC_MCI_VERSION 0x50
	#define SDCC_V5_VERSION 0x318

	#define SDCC_VERSION_MAJOR_SHIFT 28
	#define SDCC_VERSION_MAJOR_MASK (0xf << SDCC_VERSION_MAJOR_SHIFT)
	#define SDCC_VERSION_MINOR_MASK 0xff

	#define SDCC_MCI_STATUS2 0x6C
	#define SDCC_MCI_STATUS2_MCI_ACT 0x1
	#define SDCC_MCI_HC_MODE 0x78

	/* Non standard (?) SDHCI register */
	#define SDHCI_VENDOR_SPEC_CAPABILITIES0 0x11c

	struct msm_sdhc_plat {
	struct mmc_config cfg;
	struct mmc mmc;
	};

	struct msm_sdhc {
	struct sdhci_host host;
	void *base;
	struct clk_bulk clks;
	};

	struct msm_sdhc_variant_info {
	bool mci_removed;
	};

	DECLARE_GLOBAL_DATA_PTR;

	static int msm_sdc_clk_init(struct udevice *dev)
	{
	struct msm_sdhc *prv = dev_get_priv(dev);
	ofnode node = dev_ofnode(dev);
	ulong clk_rate;
	int ret, i = 0, n_clks;
	const char *clk_name;

	ret = ofnode_read_u32(node, "clock-frequency", (uint *)(&clk_rate));
	if (ret)
	clk_rate = 400000;

	ret = clk_get_bulk(dev, &prv->clks);
	if (ret) {
	log_warning("Couldn't get mmc clocks: %d\n", ret);
	return ret;
	}

	ret = clk_enable_bulk(&prv->clks);
	if (ret) {
	log_warning("Couldn't enable mmc clocks: %d\n", ret);
	return ret;
	}

	/* If clock-names is unspecified, then the first clock is the core clock */
	if (!ofnode_get_property(node, "clock-names", &n_clks)) {
	if (!clk_set_rate(&prv->clks.clks[0], clk_rate)) {
	log_warning("Couldn't set core clock rate: %d\n", ret);
	return -EINVAL;
	}
	}

	/* Find the index of the "core" clock */
	while (i < n_clks) {
	ofnode_read_string_index(node, "clock-names", i, &clk_name);
	if (!strcmp(clk_name, "core"))
	break;
	i++;
	}

	if (i >= prv->clks.count) {
	log_warning("Couldn't find core clock (index %d but only have %d clocks)\n", i,
	prv->clks.count);
	return -EINVAL;
	}

	/* The clock is already enabled by the clk_bulk above */
	clk_rate = clk_set_rate(&prv->clks.clks[i], clk_rate);
	/* If we get a rate of 0 then something has probably gone wrong. */
	if (clk_rate == 0 \|\| IS_ERR((void *)clk_rate)) {
	log_warning("Couldn't set MMC core clock rate: %dE\n", clk_rate ? (int)PTR_ERR((void *)clk_rate) : 0);
	return -EINVAL;
	}

	return 0;
	}

	static int msm_sdc_mci_init(struct msm_sdhc *prv)
	{
	/* Reset the core and Enable SDHC mode */
	writel(readl(prv->base + SDCC_MCI_POWER) \| SDCC_MCI_POWER_SW_RST,
	prv->base + SDCC_MCI_POWER);


	/* Wait for reset to be written to register */
	if (wait_for_bit_le32(prv->base + SDCC_MCI_STATUS2,
	SDCC_MCI_STATUS2_MCI_ACT, false, 10, false)) {
	printf("msm_sdhci: reset request failed\n");
	return -EIO;
	}

	/* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */
	if (wait_for_bit_le32(prv->base + SDCC_MCI_POWER,
	SDCC_MCI_POWER_SW_RST, false, 2, false)) {
	printf("msm_sdhci: stuck in reset\n");
	return -ETIMEDOUT;
	}

	/* Enable host-controller mode */
	writel(1, prv->base + SDCC_MCI_HC_MODE);

	return 0;
	}

	static int msm_sdc_probe(struct udevice *dev)
	{
	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
	struct msm_sdhc_plat *plat = dev_get_plat(dev);
	struct msm_sdhc *prv = dev_get_priv(dev);
	const struct msm_sdhc_variant_info *var_info;
	struct sdhci_host *host = &prv->host;
	u32 core_version, core_minor, core_major;
	u32 caps;
	int ret;

	host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD \| SDHCI_QUIRK_BROKEN_R1B;

	host->max_clk = 0;

	/* Init clocks */
	ret = msm_sdc_clk_init(dev);
	if (ret)
	return ret;

	var_info = (void *)dev_get_driver_data(dev);
	if (!var_info->mci_removed) {
	ret = msm_sdc_mci_init(prv);
	if (ret)
	return ret;
	}

	if (!var_info->mci_removed)
	core_version = readl(prv->base + SDCC_MCI_VERSION);
	else
	core_version = readl(host->ioaddr + SDCC_V5_VERSION);

	core_major = (core_version & SDCC_VERSION_MAJOR_MASK);
	core_major >>= SDCC_VERSION_MAJOR_SHIFT;

	core_minor = core_version & SDCC_VERSION_MINOR_MASK;

	/*
	* Support for some capabilities is not advertised by newer
	* controller versions and must be explicitly enabled.
	*/
	if (core_major >= 1 && core_minor != 0x11 && core_minor != 0x12) {
	caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
	caps \|= SDHCI_CAN_VDD_300 \| SDHCI_CAN_DO_8BIT;
	writel(caps, host->ioaddr + SDHCI_VENDOR_SPEC_CAPABILITIES0);
	}

	ret = mmc_of_parse(dev, &plat->cfg);
	if (ret)
	return ret;

	host->mmc = &plat->mmc;
	host->mmc->dev = dev;
	ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
	if (ret)
	return ret;
	host->mmc->priv = &prv->host;
	upriv->mmc = host->mmc;

	return sdhci_probe(dev);
	}

	static int msm_sdc_remove(struct udevice *dev)
	{
	struct msm_sdhc *priv = dev_get_priv(dev);
	const struct msm_sdhc_variant_info *var_info;

	var_info = (void *)dev_get_driver_data(dev);

	/* Disable host-controller mode */
	if (!var_info->mci_removed)
	writel(0, priv->base + SDCC_MCI_HC_MODE);

	clk_release_bulk(&priv->clks);

	return 0;
	}

	static int msm_of_to_plat(struct udevice *dev)
	{
	struct udevice *parent = dev->parent;
	struct msm_sdhc *priv = dev_get_priv(dev);
	struct sdhci_host *host = &priv->host;
	int node = dev_of_offset(dev);

	host->name = strdup(dev->name);
	host->ioaddr = dev_read_addr_ptr(dev);
	host->bus_width = fdtdec_get_int(gd->fdt_blob, node, "bus-width", 4);
	host->index = fdtdec_get_uint(gd->fdt_blob, node, "index", 0);
	priv->base = (void *)fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
	dev_of_offset(parent), node, "reg", 1, NULL, false);
	if (priv->base == (void *)FDT_ADDR_T_NONE \|\|
	host->ioaddr == (void *)FDT_ADDR_T_NONE)
	return -EINVAL;

	return 0;
	}

	static int msm_sdc_bind(struct udevice *dev)
	{
	struct msm_sdhc_plat *plat = dev_get_plat(dev);

	return sdhci_bind(dev, &plat->mmc, &plat->cfg);
	}

	static const struct msm_sdhc_variant_info msm_sdhc_mci_var = {
	.mci_removed = false,
	};

	static const struct msm_sdhc_variant_info msm_sdhc_v5_var = {
	.mci_removed = true,
	};

	static const struct udevice_id msm_mmc_ids[] = {
	{ .compatible = "qcom,sdhci-msm-v4", .data = (ulong)&msm_sdhc_mci_var },
	{ .compatible = "qcom,sdhci-msm-v5", .data = (ulong)&msm_sdhc_v5_var },
	{ }
	};

	U_BOOT_DRIVER(msm_sdc_drv) = {
	.name = "msm_sdc",
	.id = UCLASS_MMC,
	.of_match = msm_mmc_ids,
	.of_to_plat = msm_of_to_plat,
	.ops = &sdhci_ops,
	.bind = msm_sdc_bind,
	.probe = msm_sdc_probe,
	.remove = msm_sdc_remove,
	.priv_auto = sizeof(struct msm_sdhc),
	.plat_auto = sizeof(struct msm_sdhc_plat),
	};