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/*
* 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/init.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include <mach/gpio.h>
#include <mach/sdhci.h>
#include "sdhci.h"
#include "sdhci-pltfm.h"
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)
{
if (unlikely(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)
{
/* 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(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 *sdhci)
{
struct platform_device *pdev = to_platform_device(mmc_dev(sdhci->mmc));
struct tegra_sdhci_platform_data *plat;
plat = pdev->dev.platform_data;
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 int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
{
struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
struct tegra_sdhci_platform_data *plat;
u32 ctrl;
plat = pdev->dev.platform_data;
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 int tegra_sdhci_pltfm_init(struct sdhci_host *host,
struct sdhci_pltfm_data *pdata)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
struct tegra_sdhci_platform_data *plat;
struct clk *clk;
int rc;
plat = pdev->dev.platform_data;
if (plat == NULL) {
dev_err(mmc_dev(host->mmc), "missing platform data\n");
return -ENXIO;
}
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 out;
}
tegra_gpio_enable(plat->power_gpio);
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 out_power;
}
tegra_gpio_enable(plat->cd_gpio);
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 out_cd;
}
}
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 out_irq;
}
tegra_gpio_enable(plat->wp_gpio);
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 out_wp;
}
clk_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;
return 0;
out_wp:
if (gpio_is_valid(plat->wp_gpio)) {
tegra_gpio_disable(plat->wp_gpio);
gpio_free(plat->wp_gpio);
}
out_irq:
if (gpio_is_valid(plat->cd_gpio))
free_irq(gpio_to_irq(plat->cd_gpio), host);
out_cd:
if (gpio_is_valid(plat->cd_gpio)) {
tegra_gpio_disable(plat->cd_gpio);
gpio_free(plat->cd_gpio);
}
out_power:
if (gpio_is_valid(plat->power_gpio)) {
tegra_gpio_disable(plat->power_gpio);
gpio_free(plat->power_gpio);
}
out:
return rc;
}
static void tegra_sdhci_pltfm_exit(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
struct tegra_sdhci_platform_data *plat;
plat = pdev->dev.platform_data;
if (gpio_is_valid(plat->wp_gpio)) {
tegra_gpio_disable(plat->wp_gpio);
gpio_free(plat->wp_gpio);
}
if (gpio_is_valid(plat->cd_gpio)) {
free_irq(gpio_to_irq(plat->cd_gpio), host);
tegra_gpio_disable(plat->cd_gpio);
gpio_free(plat->cd_gpio);
}
if (gpio_is_valid(plat->power_gpio)) {
tegra_gpio_disable(plat->power_gpio);
gpio_free(plat->power_gpio);
}
clk_disable(pltfm_host->clk);
clk_put(pltfm_host->clk);
}
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,
};
struct sdhci_pltfm_data sdhci_tegra_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,
.init = tegra_sdhci_pltfm_init,
.exit = tegra_sdhci_pltfm_exit,
};
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