309 lines
7.4 KiB
C
309 lines
7.4 KiB
C
/*
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* Copyright (C) 2010 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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#include <mach/gpio.h>
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#include <mach/sdhci.h>
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#include "sdhci-pltfm.h"
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static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg)
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{
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u32 val;
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if (unlikely(reg == SDHCI_PRESENT_STATE)) {
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/* Use wp_gpio here instead? */
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val = readl(host->ioaddr + reg);
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return val | SDHCI_WRITE_PROTECT;
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}
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return readl(host->ioaddr + reg);
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}
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static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
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{
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if (unlikely(reg == SDHCI_HOST_VERSION)) {
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/* Erratum: Version register is invalid in HW. */
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return SDHCI_SPEC_200;
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}
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return readw(host->ioaddr + reg);
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}
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static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
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{
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/* Seems like we're getting spurious timeout and crc errors, so
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* disable signalling of them. In case of real errors software
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* timers should take care of eventually detecting them.
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*/
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if (unlikely(reg == SDHCI_SIGNAL_ENABLE))
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val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC);
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writel(val, host->ioaddr + reg);
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if (unlikely(reg == SDHCI_INT_ENABLE)) {
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/* Erratum: Must enable block gap interrupt detection */
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u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
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if (val & SDHCI_INT_CARD_INT)
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gap_ctrl |= 0x8;
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else
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gap_ctrl &= ~0x8;
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writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
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}
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}
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static unsigned int tegra_sdhci_get_ro(struct sdhci_host *sdhci)
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{
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struct platform_device *pdev = to_platform_device(mmc_dev(sdhci->mmc));
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struct tegra_sdhci_platform_data *plat;
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plat = pdev->dev.platform_data;
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if (!gpio_is_valid(plat->wp_gpio))
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return -1;
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return gpio_get_value(plat->wp_gpio);
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}
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static irqreturn_t carddetect_irq(int irq, void *data)
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{
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struct sdhci_host *sdhost = (struct sdhci_host *)data;
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tasklet_schedule(&sdhost->card_tasklet);
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return IRQ_HANDLED;
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};
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static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
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{
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struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
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struct tegra_sdhci_platform_data *plat;
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u32 ctrl;
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plat = pdev->dev.platform_data;
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ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
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if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
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ctrl &= ~SDHCI_CTRL_4BITBUS;
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ctrl |= SDHCI_CTRL_8BITBUS;
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} else {
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ctrl &= ~SDHCI_CTRL_8BITBUS;
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if (bus_width == MMC_BUS_WIDTH_4)
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ctrl |= SDHCI_CTRL_4BITBUS;
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else
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ctrl &= ~SDHCI_CTRL_4BITBUS;
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}
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sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
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return 0;
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}
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static struct sdhci_ops tegra_sdhci_ops = {
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.get_ro = tegra_sdhci_get_ro,
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.read_l = tegra_sdhci_readl,
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.read_w = tegra_sdhci_readw,
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.write_l = tegra_sdhci_writel,
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.platform_8bit_width = tegra_sdhci_8bit,
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};
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static struct sdhci_pltfm_data sdhci_tegra_pdata = {
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.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
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SDHCI_QUIRK_SINGLE_POWER_WRITE |
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SDHCI_QUIRK_NO_HISPD_BIT |
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SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
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.ops = &tegra_sdhci_ops,
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};
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static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
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{
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struct sdhci_pltfm_host *pltfm_host;
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struct tegra_sdhci_platform_data *plat;
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struct sdhci_host *host;
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struct clk *clk;
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int rc;
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host = sdhci_pltfm_init(pdev, &sdhci_tegra_pdata);
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if (IS_ERR(host))
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return PTR_ERR(host);
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pltfm_host = sdhci_priv(host);
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plat = pdev->dev.platform_data;
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if (plat == NULL) {
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dev_err(mmc_dev(host->mmc), "missing platform data\n");
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rc = -ENXIO;
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goto err_no_plat;
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}
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if (gpio_is_valid(plat->power_gpio)) {
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rc = gpio_request(plat->power_gpio, "sdhci_power");
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if (rc) {
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dev_err(mmc_dev(host->mmc),
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"failed to allocate power gpio\n");
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goto err_power_req;
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}
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tegra_gpio_enable(plat->power_gpio);
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gpio_direction_output(plat->power_gpio, 1);
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}
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if (gpio_is_valid(plat->cd_gpio)) {
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rc = gpio_request(plat->cd_gpio, "sdhci_cd");
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if (rc) {
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dev_err(mmc_dev(host->mmc),
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"failed to allocate cd gpio\n");
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goto err_cd_req;
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}
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tegra_gpio_enable(plat->cd_gpio);
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gpio_direction_input(plat->cd_gpio);
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rc = request_irq(gpio_to_irq(plat->cd_gpio), carddetect_irq,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
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mmc_hostname(host->mmc), host);
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if (rc) {
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dev_err(mmc_dev(host->mmc), "request irq error\n");
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goto err_cd_irq_req;
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}
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}
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if (gpio_is_valid(plat->wp_gpio)) {
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rc = gpio_request(plat->wp_gpio, "sdhci_wp");
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if (rc) {
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dev_err(mmc_dev(host->mmc),
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"failed to allocate wp gpio\n");
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goto err_wp_req;
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}
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tegra_gpio_enable(plat->wp_gpio);
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gpio_direction_input(plat->wp_gpio);
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}
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clk = clk_get(mmc_dev(host->mmc), NULL);
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if (IS_ERR(clk)) {
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dev_err(mmc_dev(host->mmc), "clk err\n");
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rc = PTR_ERR(clk);
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goto err_clk_get;
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}
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clk_enable(clk);
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pltfm_host->clk = clk;
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host->mmc->pm_caps = plat->pm_flags;
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if (plat->is_8bit)
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host->mmc->caps |= MMC_CAP_8_BIT_DATA;
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rc = sdhci_add_host(host);
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if (rc)
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goto err_add_host;
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return 0;
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err_add_host:
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clk_disable(pltfm_host->clk);
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clk_put(pltfm_host->clk);
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err_clk_get:
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if (gpio_is_valid(plat->wp_gpio)) {
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tegra_gpio_disable(plat->wp_gpio);
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gpio_free(plat->wp_gpio);
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}
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err_wp_req:
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if (gpio_is_valid(plat->cd_gpio))
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free_irq(gpio_to_irq(plat->cd_gpio), host);
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err_cd_irq_req:
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if (gpio_is_valid(plat->cd_gpio)) {
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tegra_gpio_disable(plat->cd_gpio);
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gpio_free(plat->cd_gpio);
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}
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err_cd_req:
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if (gpio_is_valid(plat->power_gpio)) {
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tegra_gpio_disable(plat->power_gpio);
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gpio_free(plat->power_gpio);
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}
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err_power_req:
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err_no_plat:
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sdhci_pltfm_free(pdev);
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return rc;
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}
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static int __devexit sdhci_tegra_remove(struct platform_device *pdev)
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{
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struct sdhci_host *host = platform_get_drvdata(pdev);
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct tegra_sdhci_platform_data *plat;
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int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
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sdhci_remove_host(host, dead);
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plat = pdev->dev.platform_data;
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if (gpio_is_valid(plat->wp_gpio)) {
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tegra_gpio_disable(plat->wp_gpio);
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gpio_free(plat->wp_gpio);
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}
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if (gpio_is_valid(plat->cd_gpio)) {
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free_irq(gpio_to_irq(plat->cd_gpio), host);
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tegra_gpio_disable(plat->cd_gpio);
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gpio_free(plat->cd_gpio);
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}
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if (gpio_is_valid(plat->power_gpio)) {
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tegra_gpio_disable(plat->power_gpio);
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gpio_free(plat->power_gpio);
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}
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clk_disable(pltfm_host->clk);
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clk_put(pltfm_host->clk);
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sdhci_pltfm_free(pdev);
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return 0;
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}
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static struct platform_driver sdhci_tegra_driver = {
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.driver = {
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.name = "sdhci-tegra",
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.owner = THIS_MODULE,
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},
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.probe = sdhci_tegra_probe,
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.remove = __devexit_p(sdhci_tegra_remove),
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#ifdef CONFIG_PM
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.suspend = sdhci_pltfm_suspend,
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.resume = sdhci_pltfm_resume,
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#endif
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};
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static int __init sdhci_tegra_init(void)
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{
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return platform_driver_register(&sdhci_tegra_driver);
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}
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module_init(sdhci_tegra_init);
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static void __exit sdhci_tegra_exit(void)
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{
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platform_driver_unregister(&sdhci_tegra_driver);
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}
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module_exit(sdhci_tegra_exit);
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MODULE_DESCRIPTION("SDHCI driver for Tegra");
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MODULE_AUTHOR(" Google, Inc.");
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MODULE_LICENSE("GPL v2");
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