drivers/mmc/exynos_dw_mmc.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2012 SAMSUNG Electronics
  * Jaehoon Chung <jh80.chung@samsung.com>
  */

 #include <dwmmc.h>
 #include <fdtdec.h>
 #include <asm/global_data.h>
 #include <linux/libfdt.h>
 #include <malloc.h>
 #include <errno.h>
 #include <asm/arch/dwmmc.h>
 #include <asm/arch/clk.h>
 #include <asm/arch/pinmux.h>
 #include <asm/arch/power.h>
 #include <asm/gpio.h>
 #include <linux/printk.h>

 #define	DWMMC_MAX_CH_NUM		4
 #define	DWMMC_MAX_FREQ			52000000
 #define	DWMMC_MIN_FREQ			400000
 #define	DWMMC_MMC0_SDR_TIMING_VAL	0x03030001
 #define	DWMMC_MMC2_SDR_TIMING_VAL	0x03020001

 #ifdef CONFIG_DM_MMC
 #include <dm.h>
 DECLARE_GLOBAL_DATA_PTR;

 struct exynos_mmc_plat {
 	struct mmc_config cfg;
 	struct mmc mmc;
 };
 #endif

 /* Exynos implmentation specific drver private data */
 struct dwmci_exynos_priv_data {
 #ifdef CONFIG_DM_MMC
 	struct dwmci_host host;
 #endif
 	u32 sdr_timing;
 };

 /*
  * Function used as callback function to initialise the
  * CLKSEL register for every mmc channel.
  */
 static int exynos_dwmci_clksel(struct dwmci_host *host)
 {
 #ifdef CONFIG_DM_MMC
 	struct dwmci_exynos_priv_data *priv =
 		container_of(host, struct dwmci_exynos_priv_data, host);
 #else
 	struct dwmci_exynos_priv_data *priv = host->priv;
 #endif
 	dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing);

 	return 0;
 }

 unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq)
 {
 	unsigned long sclk;
 	int8_t clk_div;

 	/*
 	 * Since SDCLKIN is divided inside controller by the DIVRATIO
 	 * value set in the CLKSEL register, we need to use the same output
 	 * clock value to calculate the CLKDIV value.
 	 * as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1)
 	 */
 	clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT)
 			& DWMCI_DIVRATIO_MASK) + 1;
 	sclk = get_mmc_clk(host->dev_index);

 	/*
 	 * Assume to know divider value.
 	 * When clock unit is broken, need to set "host->div"
 	 */
 	return sclk / clk_div / (host->div + 1);
 }

 static void exynos_dwmci_board_init(struct dwmci_host *host)
 {
 	struct dwmci_exynos_priv_data *priv = host->priv;

 	if (host->quirks & DWMCI_QUIRK_DISABLE_SMU) {
 		dwmci_writel(host, EMMCP_MPSBEGIN0, 0);
 		dwmci_writel(host, EMMCP_SEND0, 0);
 		dwmci_writel(host, EMMCP_CTRL0,
 			     MPSCTRL_SECURE_READ_BIT |
 			     MPSCTRL_SECURE_WRITE_BIT |
 			     MPSCTRL_NON_SECURE_READ_BIT |
 			     MPSCTRL_NON_SECURE_WRITE_BIT | MPSCTRL_VALID);
 	}

 	/* Set to timing value at initial time */
 	if (priv->sdr_timing)
 		exynos_dwmci_clksel(host);
 }

 static int exynos_dwmci_core_init(struct dwmci_host *host)
 {
 	unsigned int div;
 	unsigned long freq, sclk;

 	if (host->bus_hz)
 		freq = host->bus_hz;
 	else
 		freq = DWMMC_MAX_FREQ;

 	/* request mmc clock vlaue of 52MHz.  */
 	sclk = get_mmc_clk(host->dev_index);
 	div = DIV_ROUND_UP(sclk, freq);
 	/* set the clock divisor for mmc */
 	set_mmc_clk(host->dev_index, div);

 	host->name = "EXYNOS DWMMC";
 #ifdef CONFIG_EXYNOS5420
 	host->quirks = DWMCI_QUIRK_DISABLE_SMU;
 #endif
 	host->board_init = exynos_dwmci_board_init;

 	host->caps = MMC_MODE_DDR_52MHz;
 	host->clksel = exynos_dwmci_clksel;
 	host->get_mmc_clk = exynos_dwmci_get_clk;

 #ifndef CONFIG_DM_MMC
 	/* Add the mmc channel to be registered with mmc core */
 	if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
 		printf("DWMMC%d registration failed\n", host->dev_index);
 		return -1;
 	}
 #endif

 	return 0;
 }

 static int do_dwmci_init(struct dwmci_host *host)
 {
 	int flag, err;

 	flag = host->buswidth == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
 	err = exynos_pinmux_config(host->dev_id, flag);
 	if (err) {
 		printf("DWMMC%d not configure\n", host->dev_index);
 		return err;
 	}

 	return exynos_dwmci_core_init(host);
 }

 static int exynos_dwmci_get_config(const void *blob, int node,
 				   struct dwmci_host *host,
 				   struct dwmci_exynos_priv_data *priv)
 {
 	int err = 0;
 	u32 base, timing[3];

 	/* Extract device id for each mmc channel */
 	host->dev_id = pinmux_decode_periph_id(blob, node);

 	host->dev_index = fdtdec_get_int(blob, node, "index", host->dev_id);
 	if (host->dev_index == host->dev_id)
 		host->dev_index = host->dev_id - PERIPH_ID_SDMMC0;

 	if (host->dev_index > 4) {
 		printf("DWMMC%d: Can't get the dev index\n", host->dev_index);
 		return -EINVAL;
 	}

 	/* Get the bus width from the device node (Default is 4bit buswidth) */
 	host->buswidth = fdtdec_get_int(blob, node, "samsung,bus-width", 4);

 	/* Set the base address from the device node */
 	base = fdtdec_get_addr(blob, node, "reg");
 	if (!base) {
 		printf("DWMMC%d: Can't get base address\n", host->dev_index);
 		return -EINVAL;
 	}
 	host->ioaddr = (void *)base;

 	/* Extract the timing info from the node */
 	err =  fdtdec_get_int_array(blob, node, "samsung,timing", timing, 3);
 	if (err) {
 		printf("DWMMC%d: Can't get sdr-timings for devider\n",
 				host->dev_index);
 		return -EINVAL;
 	}

 	priv->sdr_timing = (DWMCI_SET_SAMPLE_CLK(timing[0]) |
 			DWMCI_SET_DRV_CLK(timing[1]) |
 			DWMCI_SET_DIV_RATIO(timing[2]));

 	/* sdr_timing didn't assigned anything, use the default value */
 	if (!priv->sdr_timing) {
 		if (host->dev_index == 0)
 			priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL;
 		else if (host->dev_index == 2)
 			priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL;
 	}

 	host->fifoth_val = fdtdec_get_int(blob, node, "fifoth_val", 0);
 	host->bus_hz = fdtdec_get_int(blob, node, "bus_hz", 0);
 	host->div = fdtdec_get_int(blob, node, "div", 0);

 	return 0;
 }

 #ifdef CONFIG_DM_MMC
 static int exynos_dwmmc_probe(struct udevice *dev)
 {
 	struct exynos_mmc_plat *plat = dev_get_plat(dev);
 	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 	struct dwmci_exynos_priv_data *priv = dev_get_priv(dev);
 	struct dwmci_host *host = &priv->host;
 	int err;

 	err = exynos_dwmci_get_config(gd->fdt_blob, dev_of_offset(dev), host,
 				      priv);
 	if (err)
 		return err;
 	err = do_dwmci_init(host);
 	if (err)
 		return err;

 	dwmci_setup_cfg(&plat->cfg, host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ);
 	host->mmc = &plat->mmc;
 	host->mmc->priv = &priv->host;
 	host->priv = dev;
 	upriv->mmc = host->mmc;

 	return dwmci_probe(dev);
 }

 static int exynos_dwmmc_bind(struct udevice *dev)
 {
 	struct exynos_mmc_plat *plat = dev_get_plat(dev);

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

 static const struct udevice_id exynos_dwmmc_ids[] = {
 	{ .compatible = "samsung,exynos4412-dw-mshc" },
 	{ .compatible = "samsung,exynos-dwmmc" },
 	{ }
 };

 U_BOOT_DRIVER(exynos_dwmmc_drv) = {
 	.name		= "exynos_dwmmc",
 	.id		= UCLASS_MMC,
 	.of_match	= exynos_dwmmc_ids,
 	.bind		= exynos_dwmmc_bind,
 	.ops		= &dm_dwmci_ops,
 	.probe		= exynos_dwmmc_probe,
 	.priv_auto	= sizeof(struct dwmci_exynos_priv_data),
 	.plat_auto	= sizeof(struct exynos_mmc_plat),
 };
 #endif
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (C) Copyright 2012 SAMSUNG Electronics
	* Jaehoon Chung <jh80.chung@samsung.com>
	*/

	#include <dwmmc.h>
	#include <fdtdec.h>
	#include <asm/global_data.h>
	#include <linux/libfdt.h>
	#include <malloc.h>
	#include <errno.h>
	#include <asm/arch/dwmmc.h>
	#include <asm/arch/clk.h>
	#include <asm/arch/pinmux.h>
	#include <asm/arch/power.h>
	#include <asm/gpio.h>
	#include <linux/printk.h>

	#define DWMMC_MAX_CH_NUM 4
	#define DWMMC_MAX_FREQ 52000000
	#define DWMMC_MIN_FREQ 400000
	#define DWMMC_MMC0_SDR_TIMING_VAL 0x03030001
	#define DWMMC_MMC2_SDR_TIMING_VAL 0x03020001

	#ifdef CONFIG_DM_MMC
	#include <dm.h>
	DECLARE_GLOBAL_DATA_PTR;

	struct exynos_mmc_plat {
	struct mmc_config cfg;
	struct mmc mmc;
	};
	#endif

	/* Exynos implmentation specific drver private data */
	struct dwmci_exynos_priv_data {
	#ifdef CONFIG_DM_MMC
	struct dwmci_host host;
	#endif
	u32 sdr_timing;
	};

	/*
	* Function used as callback function to initialise the
	* CLKSEL register for every mmc channel.
	*/
	static int exynos_dwmci_clksel(struct dwmci_host *host)
	{
	#ifdef CONFIG_DM_MMC
	struct dwmci_exynos_priv_data *priv =
	container_of(host, struct dwmci_exynos_priv_data, host);
	#else
	struct dwmci_exynos_priv_data *priv = host->priv;
	#endif
	dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing);

	return 0;
	}

	unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq)
	{
	unsigned long sclk;
	int8_t clk_div;

	/*
	* Since SDCLKIN is divided inside controller by the DIVRATIO
	* value set in the CLKSEL register, we need to use the same output
	* clock value to calculate the CLKDIV value.
	* as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1)
	*/
	clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT)
	& DWMCI_DIVRATIO_MASK) + 1;
	sclk = get_mmc_clk(host->dev_index);

	/*
	* Assume to know divider value.
	* When clock unit is broken, need to set "host->div"
	*/
	return sclk / clk_div / (host->div + 1);
	}

	static void exynos_dwmci_board_init(struct dwmci_host *host)
	{
	struct dwmci_exynos_priv_data *priv = host->priv;

	if (host->quirks & DWMCI_QUIRK_DISABLE_SMU) {
	dwmci_writel(host, EMMCP_MPSBEGIN0, 0);
	dwmci_writel(host, EMMCP_SEND0, 0);
	dwmci_writel(host, EMMCP_CTRL0,
	MPSCTRL_SECURE_READ_BIT \|
	MPSCTRL_SECURE_WRITE_BIT \|
	MPSCTRL_NON_SECURE_READ_BIT \|
	MPSCTRL_NON_SECURE_WRITE_BIT \| MPSCTRL_VALID);
	}

	/* Set to timing value at initial time */
	if (priv->sdr_timing)
	exynos_dwmci_clksel(host);
	}

	static int exynos_dwmci_core_init(struct dwmci_host *host)
	{
	unsigned int div;
	unsigned long freq, sclk;

	if (host->bus_hz)
	freq = host->bus_hz;
	else
	freq = DWMMC_MAX_FREQ;

	/* request mmc clock vlaue of 52MHz. */
	sclk = get_mmc_clk(host->dev_index);
	div = DIV_ROUND_UP(sclk, freq);
	/* set the clock divisor for mmc */
	set_mmc_clk(host->dev_index, div);

	host->name = "EXYNOS DWMMC";
	#ifdef CONFIG_EXYNOS5420
	host->quirks = DWMCI_QUIRK_DISABLE_SMU;
	#endif
	host->board_init = exynos_dwmci_board_init;

	host->caps = MMC_MODE_DDR_52MHz;
	host->clksel = exynos_dwmci_clksel;
	host->get_mmc_clk = exynos_dwmci_get_clk;

	#ifndef CONFIG_DM_MMC
	/* Add the mmc channel to be registered with mmc core */
	if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
	printf("DWMMC%d registration failed\n", host->dev_index);
	return -1;
	}
	#endif

	return 0;
	}

	static int do_dwmci_init(struct dwmci_host *host)
	{
	int flag, err;

	flag = host->buswidth == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
	err = exynos_pinmux_config(host->dev_id, flag);
	if (err) {
	printf("DWMMC%d not configure\n", host->dev_index);
	return err;
	}

	return exynos_dwmci_core_init(host);
	}

	static int exynos_dwmci_get_config(const void *blob, int node,
	struct dwmci_host *host,
	struct dwmci_exynos_priv_data *priv)
	{
	int err = 0;
	u32 base, timing[3];

	/* Extract device id for each mmc channel */
	host->dev_id = pinmux_decode_periph_id(blob, node);

	host->dev_index = fdtdec_get_int(blob, node, "index", host->dev_id);
	if (host->dev_index == host->dev_id)
	host->dev_index = host->dev_id - PERIPH_ID_SDMMC0;

	if (host->dev_index > 4) {
	printf("DWMMC%d: Can't get the dev index\n", host->dev_index);
	return -EINVAL;
	}

	/* Get the bus width from the device node (Default is 4bit buswidth) */
	host->buswidth = fdtdec_get_int(blob, node, "samsung,bus-width", 4);

	/* Set the base address from the device node */
	base = fdtdec_get_addr(blob, node, "reg");
	if (!base) {
	printf("DWMMC%d: Can't get base address\n", host->dev_index);
	return -EINVAL;
	}
	host->ioaddr = (void *)base;

	/* Extract the timing info from the node */
	err = fdtdec_get_int_array(blob, node, "samsung,timing", timing, 3);
	if (err) {
	printf("DWMMC%d: Can't get sdr-timings for devider\n",
	host->dev_index);
	return -EINVAL;
	}

	priv->sdr_timing = (DWMCI_SET_SAMPLE_CLK(timing[0]) \|
	DWMCI_SET_DRV_CLK(timing[1]) \|
	DWMCI_SET_DIV_RATIO(timing[2]));

	/* sdr_timing didn't assigned anything, use the default value */
	if (!priv->sdr_timing) {
	if (host->dev_index == 0)
	priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL;
	else if (host->dev_index == 2)
	priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL;
	}

	host->fifoth_val = fdtdec_get_int(blob, node, "fifoth_val", 0);
	host->bus_hz = fdtdec_get_int(blob, node, "bus_hz", 0);
	host->div = fdtdec_get_int(blob, node, "div", 0);

	return 0;
	}

	#ifdef CONFIG_DM_MMC
	static int exynos_dwmmc_probe(struct udevice *dev)
	{
	struct exynos_mmc_plat *plat = dev_get_plat(dev);
	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
	struct dwmci_exynos_priv_data *priv = dev_get_priv(dev);
	struct dwmci_host *host = &priv->host;
	int err;

	err = exynos_dwmci_get_config(gd->fdt_blob, dev_of_offset(dev), host,
	priv);
	if (err)
	return err;
	err = do_dwmci_init(host);
	if (err)
	return err;

	dwmci_setup_cfg(&plat->cfg, host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ);
	host->mmc = &plat->mmc;
	host->mmc->priv = &priv->host;
	host->priv = dev;
	upriv->mmc = host->mmc;

	return dwmci_probe(dev);
	}

	static int exynos_dwmmc_bind(struct udevice *dev)
	{
	struct exynos_mmc_plat *plat = dev_get_plat(dev);

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

	static const struct udevice_id exynos_dwmmc_ids[] = {
	{ .compatible = "samsung,exynos4412-dw-mshc" },
	{ .compatible = "samsung,exynos-dwmmc" },
	{ }
	};

	U_BOOT_DRIVER(exynos_dwmmc_drv) = {
	.name = "exynos_dwmmc",
	.id = UCLASS_MMC,
	.of_match = exynos_dwmmc_ids,
	.bind = exynos_dwmmc_bind,
	.ops = &dm_dwmci_ops,
	.probe = exynos_dwmmc_probe,
	.priv_auto = sizeof(struct dwmci_exynos_priv_data),
	.plat_auto = sizeof(struct exynos_mmc_plat),
	};
	#endif