SDHCI driver for Tegra. Pretty straight forward, a few pieces of functionality left to fill in but nothing that stops it from going upstream. Board enablement submitted separately.
This driver is based on an original one from: Signed-off-by: Yvonne Yip <[email protected]> Misc fixes and suspend/resume by: Signed-off-by: Gary King <[email protected]> Signed-off-by: Todd Poynor <[email protected]> Signed-off-by: Dmitry Shmidt <[email protected]> GPIO write protect plumbing: Signed-off-by: Rhyland Klein <[email protected]> Quirk rework and cleanups before submission: Signed-off-by: Olof Johansson <[email protected]> --- arch/arm/mach-tegra/include/mach/sdhci.h | 28 +++ drivers/mmc/host/Kconfig | 10 + drivers/mmc/host/Makefile | 1 + drivers/mmc/host/sdhci-tegra.c | 267 ++++++++++++++++++++++++++++++ 4 files changed, 306 insertions(+), 0 deletions(-) create mode 100644 arch/arm/mach-tegra/include/mach/sdhci.h create mode 100644 drivers/mmc/host/sdhci-tegra.c 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 0000000..8ca9539 --- /dev/null +++ b/arch/arm/mach-tegra/include/mach/sdhci.h @@ -0,0 +1,28 @@ +/* + * include/asm-arm/arch-tegra/include/mach/sdhci.h + * + * Copyright (C) 2009 Palm, Inc. + * Author: Yvonne Yip <[email protected]> + * + * 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; +}; + +#endif diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index d618e86..bd69bf9 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -189,6 +189,16 @@ config MMC_SDHCI_S3C_DMA YMMV. +config MMC_SDHCI_TEGRA + tristate "Tegra SD/MMC Controller Support" + depends on ARCH_TEGRA && MMC_SDHCI + 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_OMAP tristate "TI OMAP Multimedia Card Interface support" depends on ARCH_OMAP diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index 7b645ff..a096f7f 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_MMC_SDHCI_PCI) += sdhci-pci.o obj-$(CONFIG_MMC_SDHCI_PXA) += sdhci-pxa.o obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o +obj-$(CONFIG_MMC_SDHCI_TEGRA) += sdhci-tegra.o obj-$(CONFIG_MMC_WBSD) += wbsd.o obj-$(CONFIG_MMC_AU1X) += au1xmmc.o obj-$(CONFIG_MMC_OMAP) += omap.o diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c new file mode 100644 index 0000000..eb6b952 --- /dev/null +++ b/drivers/mmc/host/sdhci-tegra.c @@ -0,0 +1,267 @@ +/* + * drivers/mmc/host/sdhci-tegra.c + * + * Copyright (C) 2009 Palm, Inc. + * Author: Yvonne Yip <[email protected]> + * + * 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/module.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/gpio.h> +#include <linux/mmc/card.h> + +#include <mach/sdhci.h> + +#include "sdhci.h" + +#define DRIVER_NAME "sdhci-tegra" + +struct tegra_sdhci_host { + struct sdhci_host *sdhci; + struct clk *clk; + int wp_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) +{ + 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) +{ + 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 tegra_sdhci_host *host = sdhci_priv(sdhci); + + if (host->wp_gpio != -1) + return gpio_get_value(host->wp_gpio); + + return -1; +} + +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_enable_dma(struct sdhci_host *host) +{ + return 0; +} + +static struct sdhci_ops tegra_sdhci_ops = { + .enable_dma = tegra_sdhci_enable_dma, + .get_ro = tegra_sdhci_get_ro, + .read_l = tegra_sdhci_readl, + .read_w = tegra_sdhci_readw, + .write_l = tegra_sdhci_writel, +}; + +static int __devinit tegra_sdhci_probe(struct platform_device *pdev) +{ + int rc; + struct tegra_sdhci_platform_data *plat; + struct sdhci_host *sdhci; + struct tegra_sdhci_host *host; + struct resource *res; + int irq; + void __iomem *ioaddr; + + plat = pdev->dev.platform_data; + if (plat == NULL) + return -ENXIO; + + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (res == NULL) + return -ENODEV; + + irq = res->start; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (res == NULL) + return -ENODEV; + + ioaddr = ioremap(res->start, res->end - res->start); + + sdhci = sdhci_alloc_host(&pdev->dev, sizeof(struct tegra_sdhci_host)); + if (IS_ERR(sdhci)) { + rc = PTR_ERR(sdhci); + goto err_unmap; + } + + host = sdhci_priv(sdhci); + host->sdhci = sdhci; + + host->clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(host->clk)) { + rc = PTR_ERR(host->clk); + goto err_free_host; + } + + rc = clk_enable(host->clk); + if (rc != 0) + goto err_clkput; + + host->wp_gpio = plat->wp_gpio; + + sdhci->hw_name = "tegra"; + sdhci->ops = &tegra_sdhci_ops; + sdhci->irq = irq; + sdhci->ioaddr = ioaddr; + sdhci->quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | + SDHCI_QUIRK_SINGLE_POWER_WRITE | + SDHCI_QUIRK_NO_HISPD_BIT | + SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | + SDHCI_QUIRK_NO_SDIO_IRQ; + + rc = sdhci_add_host(sdhci); + if (rc) + goto err_clk_disable; + + platform_set_drvdata(pdev, host); + + if (plat->cd_gpio != -1) { + rc = request_irq(gpio_to_irq(plat->cd_gpio), carddetect_irq, + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, + mmc_hostname(sdhci->mmc), sdhci); + + if (rc) + goto err_remove_host; + } + + printk(KERN_INFO "sdhci%d: initialized irq %d ioaddr %p\n", pdev->id, + sdhci->irq, sdhci->ioaddr); + + return 0; + +err_remove_host: + sdhci_remove_host(sdhci, 1); +err_clk_disable: + clk_disable(host->clk); +err_clkput: + clk_put(host->clk); +err_free_host: + if (sdhci) + sdhci_free_host(sdhci); +err_unmap: + iounmap(sdhci->ioaddr); + + return rc; +} + +static int tegra_sdhci_remove(struct platform_device *pdev) +{ + struct tegra_sdhci_host *host = platform_get_drvdata(pdev); + if (host) { + struct tegra_sdhci_platform_data *plat; + plat = pdev->dev.platform_data; + + sdhci_remove_host(host->sdhci, 0); + sdhci_free_host(host->sdhci); + } + return 0; +} + +#ifdef CONFIG_PM +static int tegra_sdhci_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct tegra_sdhci_host *host = platform_get_drvdata(pdev); + int ret; + + ret = sdhci_suspend_host(host->sdhci, state); + if (ret) + pr_err("%s: failed, error = %d\n", __func__, ret); + + return ret; +} + +static int tegra_sdhci_resume(struct platform_device *pdev) +{ + struct tegra_sdhci_host *host = platform_get_drvdata(pdev); + int ret; + + ret = sdhci_resume_host(host->sdhci); + if (ret) + pr_err("%s: failed, error = %d\n", __func__, ret); + + return ret; +} +#else +#define tegra_sdhci_suspend NULL +#define tegra_sdhci_resume NULL +#endif + +static struct platform_driver tegra_sdhci_driver = { + .probe = tegra_sdhci_probe, + .remove = tegra_sdhci_remove, + .suspend = tegra_sdhci_suspend, + .resume = tegra_sdhci_resume, + .driver = { + .name = DRIVER_NAME, + .owner = THIS_MODULE, + }, +}; + +static int __init tegra_sdhci_init(void) +{ + return platform_driver_register(&tegra_sdhci_driver); +} + +static void __exit tegra_sdhci_exit(void) +{ + platform_driver_unregister(&tegra_sdhci_driver); +} + +module_init(tegra_sdhci_init); +module_exit(tegra_sdhci_exit); + +MODULE_DESCRIPTION("Tegra SDHCI controller driver"); +MODULE_LICENSE("GPL"); -- 1.7.3.GIT -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
