diff options
| -rw-r--r-- | arch/arm/mach-tegra/include/mach/sdhci.h | 29 | ||||
| -rw-r--r-- | drivers/mmc/host/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/mmc/host/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mmc/host/sdhci-pltfm.c | 3 | ||||
| -rw-r--r-- | drivers/mmc/host/sdhci-pltfm.h | 1 | ||||
| -rw-r--r-- | drivers/mmc/host/sdhci-tegra.c | 257 |
6 files changed, 301 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/include/mach/sdhci.h b/arch/arm/mach-tegra/include/mach/sdhci.h new file mode 100644 index 00000000000..3ad086e859c --- /dev/null +++ b/arch/arm/mach-tegra/include/mach/sdhci.h @@ -0,0 +1,29 @@ +/* + * include/asm-arm/arch-tegra/include/mach/sdhci.h + * + * Copyright (C) 2009 Palm, Inc. + * Author: Yvonne Yip <y@palm.com> + * + * 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. + * + */ +#ifndef __ASM_ARM_ARCH_TEGRA_SDHCI_H +#define __ASM_ARM_ARCH_TEGRA_SDHCI_H + +#include <linux/mmc/host.h> + +struct tegra_sdhci_platform_data { + int cd_gpio; + int wp_gpio; + int power_gpio; + int is_8bit; +}; + +#endif diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index f8fa9efca8e..9f47d38dcc7 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -151,6 +151,16 @@ config MMC_SDHCI_DOVE If unsure, say N. +config MMC_SDHCI_TEGRA + tristate "SDHCI platform support for the Tegra SD/MMC Controller" + depends on MMC_SDHCI_PLTFM && ARCH_TEGRA + select MMC_SDHCI_IO_ACCESSORS + help + This selects the Tegra SD/MMC controller. If you have a Tegra + platform with SD or MMC devices, say Y or M here. + + If unsure, say N. + config MMC_SDHCI_S3C tristate "SDHCI support on Samsung S3C SoC" depends on MMC_SDHCI && PLAT_SAMSUNG diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index d91364d4bf3..6d1ff9e2736 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -40,6 +40,7 @@ sdhci-platform-y := sdhci-pltfm.o sdhci-platform-$(CONFIG_MMC_SDHCI_CNS3XXX) += sdhci-cns3xxx.o sdhci-platform-$(CONFIG_MMC_SDHCI_ESDHC_IMX) += sdhci-esdhc-imx.o sdhci-platform-$(CONFIG_MMC_SDHCI_DOVE) += sdhci-dove.o +sdhci-platform-$(CONFIG_MMC_SDHCI_TEGRA) += sdhci-tegra.o obj-$(CONFIG_MMC_SDHCI_OF) += sdhci-of.o sdhci-of-y := sdhci-of-core.o diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c index 91c6766c660..dbab0407f4b 100644 --- a/drivers/mmc/host/sdhci-pltfm.c +++ b/drivers/mmc/host/sdhci-pltfm.c @@ -173,6 +173,9 @@ static const struct platform_device_id sdhci_pltfm_ids[] = { #ifdef CONFIG_MMC_SDHCI_DOVE { "sdhci-dove", (kernel_ulong_t)&sdhci_dove_pdata }, #endif +#ifdef CONFIG_MMC_SDHCI_TEGRA + { "sdhci-tegra", (kernel_ulong_t)&sdhci_tegra_pdata }, +#endif { }, }; MODULE_DEVICE_TABLE(platform, sdhci_pltfm_ids); diff --git a/drivers/mmc/host/sdhci-pltfm.h b/drivers/mmc/host/sdhci-pltfm.h index 62118b9f9d0..ea2e44d9be5 100644 --- a/drivers/mmc/host/sdhci-pltfm.h +++ b/drivers/mmc/host/sdhci-pltfm.h @@ -23,5 +23,6 @@ struct sdhci_pltfm_host { extern struct sdhci_pltfm_data sdhci_cns3xxx_pdata; extern struct sdhci_pltfm_data sdhci_esdhc_imx_pdata; extern struct sdhci_pltfm_data sdhci_dove_pdata; +extern struct sdhci_pltfm_data sdhci_tegra_pdata; #endif /* _DRIVERS_MMC_SDHCI_PLTFM_H */ diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c new file mode 100644 index 00000000000..4823ee94a63 --- /dev/null +++ b/drivers/mmc/host/sdhci-tegra.c @@ -0,0 +1,257 @@ +/* + * 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_cd; + } + 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; + + 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_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)) { + 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, +}; |