u-boot/drivers/mmc/uniphier-sd.c

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

#include <common.h>
#include <clk.h>
#include <fdtdec.h>
#include <malloc.h>
#include <mmc.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <linux/compat.h>
#include <linux/dma-direction.h>
#include <linux/io.h>
#include <linux/sizes.h>
#include <power/regulator.h>
#include <asm/unaligned.h>

#include "tmio-common.h"

static const struct dm_mmc_ops uniphier_sd_ops = {
	.send_cmd = tmio_sd_send_cmd,
	.set_ios = tmio_sd_set_ios,
	.get_cd = tmio_sd_get_cd,
};

static const struct udevice_id uniphier_sd_match[] = {
	{ .compatible = "socionext,uniphier-sd-v2.91" },
	{ .compatible = "socionext,uniphier-sd-v3.1" },
	{ .compatible = "socionext,uniphier-sd-v3.1.1" },
	{ /* sentinel */ }
};

static ulong uniphier_sd_clk_get_rate(struct tmio_sd_priv *priv)
{
#if CONFIG_IS_ENABLED(CLK)
	return clk_get_rate(&priv->clk);
#elif CONFIG_SPL_BUILD
	return 100000000;
#else
	return 0;
#endif
}

static int uniphier_sd_probe(struct udevice *dev)
{
	struct tmio_sd_priv *priv = dev_get_priv(dev);

	priv->clk_get_rate = uniphier_sd_clk_get_rate;
	priv->read_poll_flag = TMIO_SD_DMA_INFO1_END_RD2;

#ifndef CONFIG_SPL_BUILD
	int ret;

	ret = clk_get_by_index(dev, 0, &priv->clk);
	if (ret < 0) {
		dev_err(dev, "failed to get host clock\n");
		return ret;
	}

	/* set to max rate */
	ret = clk_set_rate(&priv->clk, ULONG_MAX);
	if (ret < 0) {
		dev_err(dev, "failed to set rate for host clock\n");
		clk_free(&priv->clk);
		return ret;
	}

	ret = clk_enable(&priv->clk);
	if (ret) {
		dev_err(dev, "failed to enable host clock\n");
		return ret;
	}
#endif

	return tmio_sd_probe(dev, 0);
}

U_BOOT_DRIVER(uniphier_mmc) = {
	.name = "uniphier-mmc",
	.id = UCLASS_MMC,
	.of_match = uniphier_sd_match,
	.bind = tmio_sd_bind,
	.probe = uniphier_sd_probe,
	.priv_auto	= sizeof(struct tmio_sd_priv),
	.plat_auto	= sizeof(struct tmio_sd_plat),
	.ops = &uniphier_sd_ops,
};