u-boot/drivers/mmc/rockchip_sdhci.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2016 Fuzhou Rockchip Electronics Co., Ltd
 *
 * Rockchip SD Host Controller Interface
 */

#include <common.h>
#include <dm.h>
#include <dt-structs.h>
#include <linux/err.h>
#include <linux/libfdt.h>
#include <malloc.h>
#include <mapmem.h>
#include <sdhci.h>
#include <clk.h>

/* 400KHz is max freq for card ID etc. Use that as min */
#define EMMC_MIN_FREQ	400000

struct rockchip_sdhc_plat {
#if CONFIG_IS_ENABLED(OF_PLATDATA)
	struct dtd_rockchip_rk3399_sdhci_5_1 dtplat;
#endif
	struct mmc_config cfg;
	struct mmc mmc;
};

struct rockchip_sdhc {
	struct sdhci_host host;
	void *base;
};

static int arasan_sdhci_probe(struct udevice *dev)
{
	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
	struct rockchip_sdhc_plat *plat = dev_get_plat(dev);
	struct rockchip_sdhc *prv = dev_get_priv(dev);
	struct sdhci_host *host = &prv->host;
	int max_frequency, ret;
	struct clk clk;

#if CONFIG_IS_ENABLED(OF_PLATDATA)
	struct dtd_rockchip_rk3399_sdhci_5_1 *dtplat = &plat->dtplat;

	host->name = dev->name;
	host->ioaddr = map_sysmem(dtplat->reg[0], dtplat->reg[1]);
	max_frequency = dtplat->max_frequency;
	ret = clk_get_by_driver_info(dev, dtplat->clocks, &clk);
#else
	max_frequency = dev_read_u32_default(dev, "max-frequency", 0);
	ret = clk_get_by_index(dev, 0, &clk);
#endif
	if (!ret) {
		ret = clk_set_rate(&clk, max_frequency);
		if (IS_ERR_VALUE(ret))
			printf("%s clk set rate fail!\n", __func__);
	} else {
		printf("%s fail to get clk\n", __func__);
	}

	host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD;
	host->max_clk = max_frequency;
	/*
	 * The sdhci-driver only supports 4bit and 8bit, as sdhci_setup_cfg
	 * doesn't allow us to clear MMC_MODE_4BIT.  Consequently, we don't
	 * check for other bus-width values.
	 */
	if (host->bus_width == 8)
		host->host_caps |= MMC_MODE_8BIT;

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

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

	return sdhci_probe(dev);
}

static int arasan_sdhci_of_to_plat(struct udevice *dev)
{
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
	struct sdhci_host *host = dev_get_priv(dev);

	host->name = dev->name;
	host->ioaddr = dev_read_addr_ptr(dev);
	host->bus_width = dev_read_u32_default(dev, "bus-width", 4);
#endif

	return 0;
}

static int rockchip_sdhci_bind(struct udevice *dev)
{
	struct rockchip_sdhc_plat *plat = dev_get_plat(dev);

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

static const struct udevice_id arasan_sdhci_ids[] = {
	{ .compatible = "arasan,sdhci-5.1" },
	{ }
};

U_BOOT_DRIVER(arasan_sdhci_drv) = {
	.name		= "rockchip_rk3399_sdhci_5_1",
	.id		= UCLASS_MMC,
	.of_match	= arasan_sdhci_ids,
	.of_to_plat = arasan_sdhci_of_to_plat,
	.ops		= &sdhci_ops,
	.bind		= rockchip_sdhci_bind,
	.probe		= arasan_sdhci_probe,
	.priv_auto	= sizeof(struct rockchip_sdhc),
	.plat_auto	= sizeof(struct rockchip_sdhc_plat),
};