drivers/mmc/sdhci-cadence.c

/*
 * Copyright (C) 2016 Socionext Inc.
 *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <linux/bitfield.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/sizes.h>
#include <libfdt.h>
#include <mmc.h>
#include <sdhci.h>

/* HRS - Host Register Set (specific to Cadence) */
#define SDHCI_CDNS_HRS04		0x10		/* PHY access port */
#define   SDHCI_CDNS_HRS04_ACK			BIT(26)
#define   SDHCI_CDNS_HRS04_RD			BIT(25)
#define   SDHCI_CDNS_HRS04_WR			BIT(24)
#define   SDHCI_CDNS_HRS04_RDATA		GENMASK(23, 16)
#define   SDHCI_CDNS_HRS04_WDATA		GENMASK(15, 8)
#define   SDHCI_CDNS_HRS04_ADDR			GENMASK(5, 0)

#define SDHCI_CDNS_HRS06		0x18		/* eMMC control */
#define   SDHCI_CDNS_HRS06_TUNE_UP		BIT(15)
#define   SDHCI_CDNS_HRS06_TUNE			GENMASK(13, 8)
#define   SDHCI_CDNS_HRS06_MODE			GENMASK(2, 0)
#define   SDHCI_CDNS_HRS06_MODE_SD		0x0
#define   SDHCI_CDNS_HRS06_MODE_MMC_SDR		0x2
#define   SDHCI_CDNS_HRS06_MODE_MMC_DDR		0x3
#define   SDHCI_CDNS_HRS06_MODE_MMC_HS200	0x4
#define   SDHCI_CDNS_HRS06_MODE_MMC_HS400	0x5
#define   SDHCI_CDNS_HRS06_MODE_MMC_HS400ES	0x6

/* SRS - Slot Register Set (SDHCI-compatible) */
#define SDHCI_CDNS_SRS_BASE		0x200

/* PHY */
#define SDHCI_CDNS_PHY_DLY_SD_HS	0x00
#define SDHCI_CDNS_PHY_DLY_SD_DEFAULT	0x01
#define SDHCI_CDNS_PHY_DLY_UHS_SDR12	0x02
#define SDHCI_CDNS_PHY_DLY_UHS_SDR25	0x03
#define SDHCI_CDNS_PHY_DLY_UHS_SDR50	0x04
#define SDHCI_CDNS_PHY_DLY_UHS_DDR50	0x05
#define SDHCI_CDNS_PHY_DLY_EMMC_LEGACY	0x06
#define SDHCI_CDNS_PHY_DLY_EMMC_SDR	0x07
#define SDHCI_CDNS_PHY_DLY_EMMC_DDR	0x08
#define SDHCI_CDNS_PHY_DLY_SDCLK	0x0b
#define SDHCI_CDNS_PHY_DLY_HSMMC	0x0c
#define SDHCI_CDNS_PHY_DLY_STROBE	0x0d

struct sdhci_cdns_plat {
	struct mmc_config cfg;
	struct mmc mmc;
	void __iomem *hrs_addr;
};

struct sdhci_cdns_phy_cfg {
	const char *property;
	u8 addr;
};

static const struct sdhci_cdns_phy_cfg sdhci_cdns_phy_cfgs[] = {
	{ "cdns,phy-input-delay-sd-highspeed", SDHCI_CDNS_PHY_DLY_SD_HS, },
	{ "cdns,phy-input-delay-legacy", SDHCI_CDNS_PHY_DLY_SD_DEFAULT, },
	{ "cdns,phy-input-delay-sd-uhs-sdr12", SDHCI_CDNS_PHY_DLY_UHS_SDR12, },
	{ "cdns,phy-input-delay-sd-uhs-sdr25", SDHCI_CDNS_PHY_DLY_UHS_SDR25, },
	{ "cdns,phy-input-delay-sd-uhs-sdr50", SDHCI_CDNS_PHY_DLY_UHS_SDR50, },
	{ "cdns,phy-input-delay-sd-uhs-ddr50", SDHCI_CDNS_PHY_DLY_UHS_DDR50, },
	{ "cdns,phy-input-delay-mmc-highspeed", SDHCI_CDNS_PHY_DLY_EMMC_SDR, },
	{ "cdns,phy-input-delay-mmc-ddr", SDHCI_CDNS_PHY_DLY_EMMC_DDR, },
	{ "cdns,phy-dll-delay-sdclk", SDHCI_CDNS_PHY_DLY_SDCLK, },
	{ "cdns,phy-dll-delay-sdclk-hsmmc", SDHCI_CDNS_PHY_DLY_HSMMC, },
	{ "cdns,phy-dll-delay-strobe", SDHCI_CDNS_PHY_DLY_STROBE, },
};

static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_plat *plat,
				    u8 addr, u8 data)
{
	void __iomem *reg = plat->hrs_addr + SDHCI_CDNS_HRS04;
	u32 tmp;
	int ret;

	tmp = FIELD_PREP(SDHCI_CDNS_HRS04_WDATA, data) |
	      FIELD_PREP(SDHCI_CDNS_HRS04_ADDR, addr);
	writel(tmp, reg);

	tmp |= SDHCI_CDNS_HRS04_WR;
	writel(tmp, reg);

	ret = readl_poll_timeout(reg, tmp, tmp & SDHCI_CDNS_HRS04_ACK, 10);
	if (ret)
		return ret;

	tmp &= ~SDHCI_CDNS_HRS04_WR;
	writel(tmp, reg);

	return 0;
}

static int sdhci_cdns_phy_init(struct sdhci_cdns_plat *plat,
				const void *fdt, int nodeoffset)
{
	const fdt32_t *prop;
	int ret, i;

	for (i = 0; i < ARRAY_SIZE(sdhci_cdns_phy_cfgs); i++) {
		prop = fdt_getprop(fdt, nodeoffset,
				   sdhci_cdns_phy_cfgs[i].property, NULL);
		if (!prop)
			continue;

		ret = sdhci_cdns_write_phy_reg(plat,
					       sdhci_cdns_phy_cfgs[i].addr,
					       fdt32_to_cpu(*prop));
		if (ret)
			return ret;
	}

	return 0;
}

static void sdhci_cdns_set_control_reg(struct sdhci_host *host)
{
	struct mmc *mmc = host->mmc;
	struct sdhci_cdns_plat *plat = dev_get_platdata(mmc->dev);
	unsigned int clock = mmc->clock;
	u32 mode, tmp;

	/*
	 * REVISIT:
	 * The mode should be decided by MMC_TIMING_* like Linux, but
	 * U-Boot does not support timing.  Use the clock frequency instead.
	 */
	if (clock <= 26000000)
		mode = SDHCI_CDNS_HRS06_MODE_SD; /* use this for Legacy */
	else if (clock <= 52000000) {
		if (mmc->ddr_mode)
			mode = SDHCI_CDNS_HRS06_MODE_MMC_DDR;
		else
			mode = SDHCI_CDNS_HRS06_MODE_MMC_SDR;
	} else {
		/*
		 * REVISIT:
		 * The IP supports HS200/HS400, revisit once U-Boot support it
		 */
		printf("unsupported frequency %d\n", clock);
		return;
	}

	tmp = readl(plat->hrs_addr + SDHCI_CDNS_HRS06);
	tmp &= ~SDHCI_CDNS_HRS06_MODE;
	tmp |= FIELD_PREP(SDHCI_CDNS_HRS06_MODE, mode);
	writel(tmp, plat->hrs_addr + SDHCI_CDNS_HRS06);
}

static const struct sdhci_ops sdhci_cdns_ops = {
	.set_control_reg = sdhci_cdns_set_control_reg,
};

static int sdhci_cdns_bind(struct udevice *dev)
{
	struct sdhci_cdns_plat *plat = dev_get_platdata(dev);

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

static int sdhci_cdns_probe(struct udevice *dev)
{
	DECLARE_GLOBAL_DATA_PTR;
	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
	struct sdhci_cdns_plat *plat = dev_get_platdata(dev);
	struct sdhci_host *host = dev_get_priv(dev);
	fdt_addr_t base;
	int ret;

	base = devfdt_get_addr(dev);
	if (base == FDT_ADDR_T_NONE)
		return -EINVAL;

	plat->hrs_addr = devm_ioremap(dev, base, SZ_1K);
	if (!plat->hrs_addr)
		return -ENOMEM;

	host->name = dev->name;
	host->ioaddr = plat->hrs_addr + SDHCI_CDNS_SRS_BASE;
	host->ops = &sdhci_cdns_ops;
	host->quirks |= SDHCI_QUIRK_WAIT_SEND_CMD;

	ret = sdhci_cdns_phy_init(plat, gd->fdt_blob, dev_of_offset(dev));
	if (ret)
		return ret;

	ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
	if (ret)
		return ret;

	upriv->mmc = &plat->mmc;
	host->mmc = &plat->mmc;
	host->mmc->priv = host;

	return sdhci_probe(dev);
}

static const struct udevice_id sdhci_cdns_match[] = {
	{ .compatible = "socionext,uniphier-sd4hc" },
	{ .compatible = "cdns,sd4hc" },
	{ /* sentinel */ }
};

U_BOOT_DRIVER(sdhci_cdns) = {
	.name = "sdhci-cdns",
	.id = UCLASS_MMC,
	.of_match = sdhci_cdns_match,
	.bind = sdhci_cdns_bind,
	.probe = sdhci_cdns_probe,
	.priv_auto_alloc_size = sizeof(struct sdhci_host),
	.platdata_auto_alloc_size = sizeof(struct sdhci_cdns_plat),
	.ops = &sdhci_ops,
};