/*
 * Copyright (C) 2010 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/gpio.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include <linux/mmc/slot-gpio.h>

#include <asm/gpio.h>

#include "sdhci-pltfm.h"

/* Tegra SDHOST controller vendor register definitions */
#define SDHCI_TEGRA_VENDOR_MISC_CTRL		0x120
#define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300	0x20

#define NVQUIRK_FORCE_SDHCI_SPEC_200	BIT(0)
#define NVQUIRK_ENABLE_BLOCK_GAP_DET	BIT(1)
#define NVQUIRK_ENABLE_SDHCI_SPEC_300	BIT(2)

struct sdhci_tegra_soc_data {
	const struct sdhci_pltfm_data *pdata;
	u32 nvquirks;
};

struct sdhci_tegra {
	const struct sdhci_tegra_soc_data *soc_data;
	int power_gpio;
};

static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg)
{
	u32 val;

	if (unlikely(reg == SDHCI_PRESENT_STATE)) {
		/* Use wp_gpio here instead? */
		val = readl(host->ioaddr + reg);
		return val | SDHCI_WRITE_PROTECT;
	}

	return readl(host->ioaddr + reg);
}

static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_tegra *tegra_host = pltfm_host->priv;
	const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;

	if (unlikely((soc_data->nvquirks & NVQUIRK_FORCE_SDHCI_SPEC_200) &&
			(reg == SDHCI_HOST_VERSION))) {
		/* Erratum: Version register is invalid in HW. */
		return SDHCI_SPEC_200;
	}

	return readw(host->ioaddr + reg);
}

static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_tegra *tegra_host = pltfm_host->priv;
	const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;

	/* Seems like we're getting spurious timeout and crc errors, so
	 * disable signalling of them. In case of real errors software
	 * timers should take care of eventually detecting them.
	 */
	if (unlikely(reg == SDHCI_SIGNAL_ENABLE))
		val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC);

	writel(val, host->ioaddr + reg);

	if (unlikely((soc_data->nvquirks & NVQUIRK_ENABLE_BLOCK_GAP_DET) &&
			(reg == SDHCI_INT_ENABLE))) {
		/* Erratum: Must enable block gap interrupt detection */
		u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
		if (val & SDHCI_INT_CARD_INT)
			gap_ctrl |= 0x8;
		else
			gap_ctrl &= ~0x8;
		writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
	}
}

static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host)
{
	return mmc_gpio_get_ro(host->mmc);
}

static void tegra_sdhci_reset_exit(struct sdhci_host *host, u8 mask)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_tegra *tegra_host = pltfm_host->priv;
	const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;

	if (!(mask & SDHCI_RESET_ALL))
		return;

	/* Erratum: Enable SDHCI spec v3.00 support */
	if (soc_data->nvquirks & NVQUIRK_ENABLE_SDHCI_SPEC_300) {
		u32 misc_ctrl;

		misc_ctrl = sdhci_readb(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
		misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300;
		sdhci_writeb(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);
	}
}

static void tegra_sdhci_set_bus_width(struct sdhci_host *host, int bus_width)
{
	u32 ctrl;

	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
	if ((host->mmc->caps & MMC_CAP_8_BIT_DATA) &&
	    (bus_width == MMC_BUS_WIDTH_8)) {
		ctrl &= ~SDHCI_CTRL_4BITBUS;
		ctrl |= SDHCI_CTRL_8BITBUS;
	} else {
		ctrl &= ~SDHCI_CTRL_8BITBUS;
		if (bus_width == MMC_BUS_WIDTH_4)
			ctrl |= SDHCI_CTRL_4BITBUS;
		else
			ctrl &= ~SDHCI_CTRL_4BITBUS;
	}
	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
}

static const struct sdhci_ops tegra_sdhci_ops = {
	.get_ro     = tegra_sdhci_get_ro,
	.read_l     = tegra_sdhci_readl,
	.read_w     = tegra_sdhci_readw,
	.write_l    = tegra_sdhci_writel,
	.set_bus_width = tegra_sdhci_set_bus_width,
	.platform_reset_exit = tegra_sdhci_reset_exit,
};

static const struct sdhci_pltfm_data sdhci_tegra20_pdata = {
	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
		  SDHCI_QUIRK_NO_HISPD_BIT |
		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
	.ops  = &tegra_sdhci_ops,
};

static struct sdhci_tegra_soc_data soc_data_tegra20 = {
	.pdata = &sdhci_tegra20_pdata,
	.nvquirks = NVQUIRK_FORCE_SDHCI_SPEC_200 |
		    NVQUIRK_ENABLE_BLOCK_GAP_DET,
};

static const struct sdhci_pltfm_data sdhci_tegra30_pdata = {
	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
		  SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
		  SDHCI_QUIRK_NO_HISPD_BIT |
		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
	.ops  = &tegra_sdhci_ops,
};

static struct sdhci_tegra_soc_data soc_data_tegra30 = {
	.pdata = &sdhci_tegra30_pdata,
	.nvquirks = NVQUIRK_ENABLE_SDHCI_SPEC_300,
};

static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
		  SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
		  SDHCI_QUIRK_NO_HISPD_BIT |
		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
	.ops  = &tegra_sdhci_ops,
};

static struct sdhci_tegra_soc_data soc_data_tegra114 = {
	.pdata = &sdhci_tegra114_pdata,
};

static const struct of_device_id sdhci_tegra_dt_match[] = {
	{ .compatible = "nvidia,tegra124-sdhci", .data = &soc_data_tegra114 },
	{ .compatible = "nvidia,tegra114-sdhci", .data = &soc_data_tegra114 },
	{ .compatible = "nvidia,tegra30-sdhci", .data = &soc_data_tegra30 },
	{ .compatible = "nvidia,tegra20-sdhci", .data = &soc_data_tegra20 },
	{}
};
MODULE_DEVICE_TABLE(of, sdhci_tegra_dt_match);

static int sdhci_tegra_parse_dt(struct device *dev)
{
	struct device_node *np = dev->of_node;
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_tegra *tegra_host = pltfm_host->priv;

	tegra_host->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
	return mmc_of_parse(host->mmc);
}

static int sdhci_tegra_probe(struct platform_device *pdev)
{
	const struct of_device_id *match;
	const struct sdhci_tegra_soc_data *soc_data;
	struct sdhci_host *host;
	struct sdhci_pltfm_host *pltfm_host;
	struct sdhci_tegra *tegra_host;
	struct clk *clk;
	int rc;

	match = of_match_device(sdhci_tegra_dt_match, &pdev->dev);
	if (!match)
		return -EINVAL;
	soc_data = match->data;

	host = sdhci_pltfm_init(pdev, soc_data->pdata, 0);
	if (IS_ERR(host))
		return PTR_ERR(host);
	pltfm_host = sdhci_priv(host);

	tegra_host = devm_kzalloc(&pdev->dev, sizeof(*tegra_host), GFP_KERNEL);
	if (!tegra_host) {
		dev_err(mmc_dev(host->mmc), "failed to allocate tegra_host\n");
		rc = -ENOMEM;
		goto err_alloc_tegra_host;
	}
	tegra_host->soc_data = soc_data;
	pltfm_host->priv = tegra_host;

	rc = sdhci_tegra_parse_dt(&pdev->dev);
	if (rc)
		goto err_parse_dt;

	if (gpio_is_valid(tegra_host->power_gpio)) {
		rc = gpio_request(tegra_host->power_gpio, "sdhci_power");
		if (rc) {
			dev_err(mmc_dev(host->mmc),
				"failed to allocate power gpio\n");
			goto err_power_req;
		}
		gpio_direction_output(tegra_host->power_gpio, 1);
	}

	clk = clk_get(mmc_dev(host->mmc), NULL);
	if (IS_ERR(clk)) {
		dev_err(mmc_dev(host->mmc), "clk err\n");
		rc = PTR_ERR(clk);
		goto err_clk_get;
	}
	clk_prepare_enable(clk);
	pltfm_host->clk = clk;

	rc = sdhci_add_host(host);
	if (rc)
		goto err_add_host;

	return 0;

err_add_host:
	clk_disable_unprepare(pltfm_host->clk);
	clk_put(pltfm_host->clk);
err_clk_get:
	if (gpio_is_valid(tegra_host->power_gpio))
		gpio_free(tegra_host->power_gpio);
err_power_req:
err_parse_dt:
err_alloc_tegra_host:
	sdhci_pltfm_free(pdev);
	return rc;
}

static int sdhci_tegra_remove(struct platform_device *pdev)
{
	struct sdhci_host *host = platform_get_drvdata(pdev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_tegra *tegra_host = pltfm_host->priv;
	int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);

	sdhci_remove_host(host, dead);

	if (gpio_is_valid(tegra_host->power_gpio))
		gpio_free(tegra_host->power_gpio);

	clk_disable_unprepare(pltfm_host->clk);
	clk_put(pltfm_host->clk);

	sdhci_pltfm_free(pdev);

	return 0;
}

static struct platform_driver sdhci_tegra_driver = {
	.driver		= {
		.name	= "sdhci-tegra",
		.owner	= THIS_MODULE,
		.of_match_table = sdhci_tegra_dt_match,
		.pm	= SDHCI_PLTFM_PMOPS,
	},
	.probe		= sdhci_tegra_probe,
	.remove		= sdhci_tegra_remove,
};

module_platform_driver(sdhci_tegra_driver);

MODULE_DESCRIPTION("SDHCI driver for Tegra");
MODULE_AUTHOR("Google, Inc.");
MODULE_LICENSE("GPL v2");