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 <y@xxxxxxxx>
Misc fixes and suspend/resume by:
Signed-off-by: Gary King <gking@xxxxxxxxxx>
Signed-off-by: Todd Poynor <toddpoynor@xxxxxxxxxx>
Signed-off-by: Dmitry Shmidt <dimitrysh@xxxxxxxxxx>
GPIO write protect plumbing:
Signed-off-by: Rhyland Klein <rklein@xxxxxxxxxx>
Quirk rework and cleanups before submission:
Signed-off-by: Olof Johansson <olof@xxxxxxxxx>
---
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 <y@xxxxxxxx>
+ *
+ * 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 <y@xxxxxxxx>
+ *
+ * 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
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