blob: 3695b2e0cbd2ad20bd92adc08a74a09b75761962 [file] [log] [blame]
/*
* 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 <asm/gpio.h>
#include <linux/platform_data/mmc-sdhci-tegra.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 {
struct sdhci_pltfm_data *pdata;
u32 nvquirks;
};
struct sdhci_tegra {
const struct tegra_sdhci_platform_data *plat;
const struct sdhci_tegra_soc_data *soc_data;
};
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)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = pltfm_host->priv;
const struct tegra_sdhci_platform_data *plat = tegra_host->plat;
if (!gpio_is_valid(plat->wp_gpio))
return -1;
return gpio_get_value(plat->wp_gpio);
}
static irqreturn_t carddetect_irq(int irq, void *data)
{
struct sdhci_host *sdhost = (struct sdhci_host *)data;
tasklet_schedule(&sdhost->card_tasklet);
return IRQ_HANDLED;
};
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 int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = pltfm_host->priv;
const struct tegra_sdhci_platform_data *plat = tegra_host->plat;
u32 ctrl;
ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
if (plat->is_8bit && 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);
return 0;
}
static 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,
.platform_8bit_width = tegra_sdhci_8bit,
.platform_reset_exit = tegra_sdhci_reset_exit,
};
#ifdef CONFIG_ARCH_TEGRA_2x_SOC
static 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,
};
#endif
#ifdef CONFIG_ARCH_TEGRA_3x_SOC
static 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,
};
#endif
static const struct of_device_id sdhci_tegra_dt_match[] = {
#ifdef CONFIG_ARCH_TEGRA_3x_SOC
{ .compatible = "nvidia,tegra30-sdhci", .data = &soc_data_tegra30 },
#endif
#ifdef CONFIG_ARCH_TEGRA_2x_SOC
{ .compatible = "nvidia,tegra20-sdhci", .data = &soc_data_tegra20 },
#endif
{}
};
MODULE_DEVICE_TABLE(of, sdhci_dt_ids);
static struct tegra_sdhci_platform_data *sdhci_tegra_dt_parse_pdata(
struct platform_device *pdev)
{
struct tegra_sdhci_platform_data *plat;
struct device_node *np = pdev->dev.of_node;
u32 bus_width;
if (!np)
return NULL;
plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
if (!plat) {
dev_err(&pdev->dev, "Can't allocate platform data\n");
return NULL;
}
plat->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
plat->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
plat->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
if (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
bus_width == 8)
plat->is_8bit = 1;
return plat;
}
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 tegra_sdhci_platform_data *plat;
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);
if (IS_ERR(host))
return PTR_ERR(host);
pltfm_host = sdhci_priv(host);
plat = pdev->dev.platform_data;
if (plat == NULL)
plat = sdhci_tegra_dt_parse_pdata(pdev);
if (plat == NULL) {
dev_err(mmc_dev(host->mmc), "missing platform data\n");
rc = -ENXIO;
goto err_no_plat;
}
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_no_plat;
}
tegra_host->plat = plat;
tegra_host->soc_data = soc_data;
pltfm_host->priv = tegra_host;
if (gpio_is_valid(plat->power_gpio)) {
rc = gpio_request(plat->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(plat->power_gpio, 1);
}
if (gpio_is_valid(plat->cd_gpio)) {
rc = gpio_request(plat->cd_gpio, "sdhci_cd");
if (rc) {
dev_err(mmc_dev(host->mmc),
"failed to allocate cd gpio\n");
goto err_cd_req;
}
gpio_direction_input(plat->cd_gpio);
rc = request_irq(gpio_to_irq(plat->cd_gpio), carddetect_irq,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
mmc_hostname(host->mmc), host);
if (rc) {
dev_err(mmc_dev(host->mmc), "request irq error\n");
goto err_cd_irq_req;
}
}
if (gpio_is_valid(plat->wp_gpio)) {
rc = gpio_request(plat->wp_gpio, "sdhci_wp");
if (rc) {
dev_err(mmc_dev(host->mmc),
"failed to allocate wp gpio\n");
goto err_wp_req;
}
gpio_direction_input(plat->wp_gpio);
}
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;
host->mmc->pm_caps = plat->pm_flags;
if (plat->is_8bit)
host->mmc->caps |= MMC_CAP_8_BIT_DATA;
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(plat->wp_gpio))
gpio_free(plat->wp_gpio);
err_wp_req:
if (gpio_is_valid(plat->cd_gpio))
free_irq(gpio_to_irq(plat->cd_gpio), host);
err_cd_irq_req:
if (gpio_is_valid(plat->cd_gpio))
gpio_free(plat->cd_gpio);
err_cd_req:
if (gpio_is_valid(plat->power_gpio))
gpio_free(plat->power_gpio);
err_power_req:
err_no_plat:
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;
const struct tegra_sdhci_platform_data *plat = tegra_host->plat;
int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
sdhci_remove_host(host, dead);
if (gpio_is_valid(plat->wp_gpio))
gpio_free(plat->wp_gpio);
if (gpio_is_valid(plat->cd_gpio)) {
free_irq(gpio_to_irq(plat->cd_gpio), host);
gpio_free(plat->cd_gpio);
}
if (gpio_is_valid(plat->power_gpio))
gpio_free(plat->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");