Based on SDHCI platform API, PIO and simple internal DMA
are enabled.
Signed-off-by: Richard Zhu <r65037@xxxxxxxxxxxxx>
---
drivers/mmc/host/Kconfig | 12 +
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/sdhci-fsl.c | 481 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 494 insertions(+), 0 deletions(-)
create mode 100644 drivers/mmc/host/sdhci-fsl.c
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 283190b..2b67e11 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -167,6 +167,18 @@ config MMC_SDHCI_S3C_DMA
YMMV.
+config MMC_SDHCI_FSL
+ tristate "Freescale i.MX platform eSDHCI support"
+ depends on ARCH_MX5 && MMC_SDHCI
+ select MMC_SDHCI_IO_ACCESSORS
+ help
+ This selects the Freescale i.MX Enhanced Secure Card Host
+ Controller Interface.
+ If you have a i.MX platform with a Multimedia Card slot,
+ 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 840bcb5..649656c 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_MMC_MXC) += mxcmmc.o
obj-$(CONFIG_MMC_SDHCI) += sdhci.o
obj-$(CONFIG_MMC_SDHCI_PCI) += sdhci-pci.o
obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o
+obj-$(CONFIG_MMC_SDHCI_FSL) += sdhci-fsl.o
obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o
obj-$(CONFIG_MMC_WBSD) += wbsd.o
obj-$(CONFIG_MMC_AU1X) += au1xmmc.o
diff --git a/drivers/mmc/host/sdhci-fsl.c b/drivers/mmc/host/sdhci-fsl.c
new file mode 100644
index 0000000..fa57ec4
--- /dev/null
+++ b/drivers/mmc/host/sdhci-fsl.c
@@ -0,0 +1,481 @@
+/*
+ * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * sdhci-fsl.c Support for SDHCI platform devices
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * SDHCI fsl devices
+ *
+ * Inspired by sdhci-pci.c, by Pierre Ossman
+ */
+
+#include <linux/delay.h>
+#include <linux/highmem.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/regulator/consumer.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/mmc/host.h>
+
+#include <mach/mmc.h>
+
+#include "sdhci.h"
+
+#define DRIVER_NAME "imx-sdhci"
+
+enum {
+ /* Vendor specified registors */
+ FSL_SDHCI_WML = 0x44,
+ FSL_SDHCI_WML_16_WORDS = 0x08100810,
+ FSL_SDHCI_WML_32_WORDS = 0x08200820,
+ FSL_SDHCI_WML_64_WORDS = 0x08400840,
+ FSL_SDHCI_WML_128_WORDS = 0x08800880,
+
+ /* Non-standard clock control registor */
+ FSL_SDHCI_CLOCK_MASK = 0xFFFF,
+ FSL_SDHCI_CLOCK_SD_EN = 0x00000008,
+ FSL_SDHCI_CLOCK_HLK_EN = 0x00000002,
+
+ /* Non-standard host control registor */
+ FSL_SDHCI_CTRL_8BITBUS = 0x00000004,
+};
+
+/*****************************************************************************\
+ * *
+ * SDHCI core callbacks *
+ * *
+\*****************************************************************************/
+
+struct sdhci_fsl_host {
+ struct sdhci_host *host;
+ struct platform_device *pdev; /*! Platform dev */
+ struct imxmmc_platform_data *pdata; /*! private data */
+ struct clk *clk_input; /*! Clock */
+ struct regulator *regulator_mmc; /*! Regulator */
+};
+
+static u32 sdhci_fsl_readl(struct sdhci_host *host, int reg)
+{
+ return readl(host->ioaddr + reg);
+}
+
+static u16 sdhci_fsl_readw(struct sdhci_host *host, int reg)
+{
+ u32 val;
+ u16 rc;
+
+ if (reg % 4 == 3) {
+ printk(KERN_ERR "Invalid reg address!\n");
+ return 0;
+ }
+
+ val = readl(host->ioaddr + (reg / 4) * 4);
+ rc = (val >> (reg % 4) * 8) & 0xFFFF;
+
+ return rc;
+}
+
+static u8 sdhci_fsl_readb(struct sdhci_host *host, int reg)
+{
+ u32 val;
+ u8 rc;
+
+ val = readl(host->ioaddr + (reg / 4) * 4);
+ rc = (val >> (reg % 4) * 8) & 0xFF;
+
+ return rc;
+}
+
+static void sdhci_fsl_writel(struct sdhci_host *host, u32 val, int reg)
+{
+ writel(val, host->ioaddr + reg);
+}
+
+static void sdhci_fsl_writew(struct sdhci_host *host, u16 val, int reg)
+{
+ u32 io_val;
+
+ if (reg % 4 == 3) {
+ printk(KERN_ERR "Invalid reg address!\n");
+ return;
+ }
+
+ io_val = readl(host->ioaddr + (reg / 4) * 4);
+ io_val &= ~(0xFFFF << ((reg % 4) * 8));
+ io_val |= val << ((reg % 4) * 8);
+
+ writel(io_val, host->ioaddr + (reg / 4) * 4);
+}
+
+static void sdhci_fsl_writeb(struct sdhci_host *host, u8 val, int reg)
+{
+ u32 io_val;
+
+ io_val = readl(host->ioaddr + (reg / 4) * 4);
+ io_val &= ~(0xFF << ((reg % 4) * 8));
+ io_val |= val << ((reg % 4) * 8);
+
+ writel(io_val, host->ioaddr + (reg / 4) * 4);
+}
+
+static unsigned int sdhci_fsl_get_max_clock(struct sdhci_host *host)
+{
+ struct sdhci_fsl_host *fsl_host = sdhci_priv(host);
+
+ return fsl_host->pdata->max_clk;
+}
+
+static unsigned int sdhci_fsl_get_min_clock(struct sdhci_host *host)
+{
+ struct sdhci_fsl_host *fsl_host = sdhci_priv(host);
+
+ return fsl_host->pdata->min_clk;
+}
+
+static unsigned int sdhci_fsl_get_timeout_clock(struct sdhci_host *host)
+{
+ return sdhci_fsl_get_max_clock(host) / 1000000;
+}
+
+static unsigned int sdhci_fsl_get_ro(struct sdhci_host *host)
+{
+ struct sdhci_fsl_host *fsl_host = sdhci_priv(host);
+
+ return fsl_host->pdata->wp_status(host->mmc->parent);
+}
+
+static void sdhci_fsl_set_clock(struct sdhci_host *host, unsigned int clock)
+{
+ /*This variable holds the value of clock divider, prescaler */
+ int div = 0, prescaler = 1;
+ int clk_rate = 0;
+ u32 clk;
+ unsigned long timeout;
+ struct sdhci_fsl_host *fsl_host = sdhci_priv(host);
+
+ if (clock == 0) {
+ host->clock = 0;
+ clk = readl(host->ioaddr + SDHCI_CLOCK_CONTROL);
+ writel(clk & (~FSL_SDHCI_CLOCK_HLK_EN),
+ host->ioaddr + SDHCI_CLOCK_CONTROL);
+ return;
+ }
+
+ clk_rate = clk_get_rate(fsl_host->clk_input);
+ clk = readl(host->ioaddr + SDHCI_CLOCK_CONTROL) & ~FSL_SDHCI_CLOCK_MASK;
+ /* precaler can't be set to zero in CLK_CTL reg */
+ clk |= (prescaler << 8);
+ writel(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
+
+ if (clock == sdhci_fsl_get_min_clock(host))
+ prescaler = 0x10;
+
+ while (prescaler <= 0x80) {
+ for (div = 0; div <= 0xF; div++) {
+ int x;
+ if (prescaler != 0)
+ x = (clk_rate / (div + 1)) / (prescaler * 2);
+ else
+ x = clk_rate / (div + 1);
+
+ dev_dbg(&fsl_host->pdev->dev, "x=%d, clock=%d %d\n",
+ x, clock, div);
+ if (x <= clock)
+ break;
+ }
+ if (div < 0x10)
+ break;
+
+ prescaler <<= 1;
+ }
+ dev_dbg(&fsl_host->pdev->dev, "prescaler = 0x%x, divider = 0x%x\n",
+ prescaler, div);
+ clk |= (prescaler << 8) | (div << 4);
+
+ /* Configure the clock control register */
+ clk |= readl(host->ioaddr + SDHCI_CLOCK_CONTROL)
+ & (~FSL_SDHCI_CLOCK_MASK);
+ clk |= FSL_SDHCI_CLOCK_HLK_EN;
+ writel(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
+
+ /* Wait max 10 ms */
+ timeout = 5000;
+ while (timeout > 0) {
+ timeout--;
+ udelay(20);
+ }
+ writel(clk | FSL_SDHCI_CLOCK_SD_EN, host->ioaddr + SDHCI_CLOCK_CONTROL);
+
+ host->clock = (clk_rate / (div + 1)) / (prescaler * 2);
+}
+
+static void sdhci_fsl_set_power(struct sdhci_host *host, unsigned int power)
+{
+ struct sdhci_fsl_host *fsl_host = sdhci_priv(host);
+ int voltage = 0;
+
+ /* There is no sdhci standard PWR CTL REG in fsl esdhci */
+ if (host->pwr == power)
+ return;
+
+ if (fsl_host->regulator_mmc) {
+ if (power == (unsigned short)-1) {
+ regulator_disable(fsl_host->regulator_mmc);
+ dev_dbg(&fsl_host->pdev->dev, "mmc power off\n");
+ } else {
+ if (power == 7)
+ voltage = 1800000;
+ else if (power >= 8)
+ voltage = 2000000 + (power - 8) * 100000;
+ regulator_set_voltage(fsl_host->regulator_mmc,
+ voltage, voltage);
+
+ if (regulator_enable(fsl_host->regulator_mmc) == 0) {
+ dev_dbg(&fsl_host->pdev->dev, "mmc power on\n");
+ msleep(1);
+ }
+ }
+ }
+
+ host->pwr = power;
+}
+
+static void sdhci_fsl_set_bus(struct sdhci_host *host, unsigned int bus_width)
+{
+ u32 ctrl;
+
+ ctrl = readl(host->ioaddr + SDHCI_HOST_CONTROL);
+
+ if (bus_width == MMC_BUS_WIDTH_4) {
+ ctrl &= ~FSL_SDHCI_CTRL_8BITBUS;
+ ctrl |= SDHCI_CTRL_4BITBUS;
+ } else if (bus_width == MMC_BUS_WIDTH_8) {
+ ctrl &= ~SDHCI_CTRL_4BITBUS;
+ ctrl |= FSL_SDHCI_CTRL_8BITBUS;
+ } else if (bus_width == MMC_BUS_WIDTH_1) {
+ ctrl &= ~SDHCI_CTRL_4BITBUS;
+ ctrl &= ~FSL_SDHCI_CTRL_8BITBUS;
+ }
+
+ writel(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
+}
+
+static u16 sdhci_fsl_make_blksz(u16 blk_sz)
+{
+ return blk_sz &= 0x1FFF;
+}
+
+static int esdhci_fsl_enable_dma(struct sdhci_host *host)
+{
+ u32 ctrl;
+
+ ctrl = readl(host->ioaddr + SDHCI_HOST_CONTROL);
+ ctrl &= ~(SDHCI_CTRL_DMA_MASK << 5);
+ if ((host->flags & SDHCI_REQ_USE_DMA) &&
+ (host->flags & SDHCI_USE_ADMA))
+ ctrl |= (SDHCI_CTRL_ADMA32 << 8);
+ else if (host->flags & SDHCI_REQ_USE_DMA)
+ ctrl |= (SDHCI_CTRL_SDMA << 8);
+
+ writel(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
+
+ if (host->flags & SDHCI_REQ_USE_DMA)
+ writel(FSL_SDHCI_WML_64_WORDS,
+ host->ioaddr + FSL_SDHCI_WML);
+ else
+ writel(FSL_SDHCI_WML_128_WORDS,
+ host->ioaddr + FSL_SDHCI_WML);
+ return 0;
+}
+
+static const struct sdhci_ops sdhci_fsl_ops = {
+ .read_l = sdhci_fsl_readl,
+ .read_w = sdhci_fsl_readw,
+ .read_b = sdhci_fsl_readb,
+ .write_l = sdhci_fsl_writel,
+ .write_w = sdhci_fsl_writew,
+ .write_b = sdhci_fsl_writeb,
+ .set_clock = sdhci_fsl_set_clock,
+ .set_power = sdhci_fsl_set_power,
+ .set_bus = sdhci_fsl_set_bus,
+ .enable_dma = esdhci_fsl_enable_dma,
+ .get_max_clock = sdhci_fsl_get_max_clock,
+ .get_min_clock = sdhci_fsl_get_min_clock,
+ .get_timeout_clock = sdhci_fsl_get_timeout_clock,
+ .get_ro = sdhci_fsl_get_ro,
+ .make_blksz = sdhci_fsl_make_blksz,
+};
+
+/*****************************************************************************\
+ * *
+ * Device probing/removal *
+ * *
+\*****************************************************************************/
+
+static int __devinit sdhci_fsl_probe(struct platform_device *pdev)
+{
+ struct sdhci_host *host;
+ struct resource *iomem;
+ struct sdhci_fsl_host *fsl_host;
+ int ret;
+ struct imxmmc_platform_data *pdata = pdev->dev.platform_data;
+
+ BUG_ON(pdev == NULL);
+
+ iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!iomem) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ host = sdhci_alloc_host(&pdev->dev, sizeof(struct sdhci_fsl_host));
+
+ if (IS_ERR(host)) {
+ ret = PTR_ERR(host);
+ goto err;
+ }
+
+ fsl_host = sdhci_priv(host);
+
+ fsl_host->host = host;
+ fsl_host->pdev = pdev;
+ fsl_host->pdata = pdata;
+
+ /* Get clk supply for eSDHC */
+ fsl_host->clk_input = clk_get(&pdev->dev, "esdhc_clk");
+ if (IS_ERR(fsl_host->clk_input)) {
+ ret = PTR_ERR(fsl_host->clk_input);
+ printk(KERN_ERR "IMX MMC can't get clock.\n");
+ goto err_request_clk;
+ }
+ clk_enable(fsl_host->clk_input);
+
+ dev_dbg(&pdev->dev, "SDHC:%d clock:%lu\n",
+ pdev->id, clk_get_rate(fsl_host->clk_input));
+
+ host->hw_name = "sdhci-fsl";
+ host->ops = &sdhci_fsl_ops;
+ host->irq = platform_get_irq(pdev, 0);
+
+ host->quirks = SDHCI_QUIRK_BROKEN_ADMA
+ | SDHCI_QUIRK_32BIT_DMA_ADDR
+ | SDHCI_QUIRK_32BIT_ADMA_SIZE
+ | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
+ | SDHCI_QUIRK_NO_BUSY_IRQ
+ | SDHCI_QUIRK_BROKEN_CARD_DETECTION
+ | SDHCI_QUIRK_NONSTANDARD_CLOCK
+ | SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET
+ | SDHCI_QUIRK_32BIT_CMD_TRANS_COMBINATION
+ | SDHCI_QUIRK_NONSTANDARD_HOST_CTL;
+ if (!request_mem_region(iomem->start, resource_size(iomem),
+ mmc_hostname(host->mmc))) {
+ dev_err(&pdev->dev, "cannot request region\n");
+ ret = -EBUSY;
+ goto err_request_mem;
+ }
+
+ host->ioaddr = ioremap(iomem->start, resource_size(iomem));
+ if (!host->ioaddr) {
+ dev_err(&pdev->dev, "failed to remap registers\n");
+ ret = -ENOMEM;
+ goto err_remap;
+ }
+
+ ret = sdhci_add_host(host);
+ if (ret)
+ goto err_add_host;
+
+ platform_set_drvdata(pdev, host);
+
+ return 0;
+
+err_add_host:
+ iounmap(host->ioaddr);
+err_remap:
+ release_mem_region(iomem->start, resource_size(iomem));
+err_request_mem:
+ if (fsl_host->clk_input) {
+ clk_disable(fsl_host->clk_input);
+ clk_put(fsl_host->clk_input);
+ }
+err_request_clk:
+ if (fsl_host->regulator_mmc) {
+ regulator_disable(fsl_host->regulator_mmc);
+ regulator_put(fsl_host->regulator_mmc);
+ }
+ sdhci_free_host(host);
+err:
+ printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
+ return ret;
+}
+
+static int __devexit sdhci_fsl_remove(struct platform_device *pdev)
+{
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+ struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ int dead;
+ u32 scratch;
+
+ dead = 0;
+ scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
+ if (scratch == (u32)-1)
+ dead = 1;
+
+ sdhci_remove_host(host, dead);
+ iounmap(host->ioaddr);
+ release_mem_region(iomem->start, resource_size(iomem));
+ sdhci_free_host(host);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver sdhci_fsl_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = sdhci_fsl_probe,
+ .remove = __devexit_p(sdhci_fsl_remove),
+};
+
+/*****************************************************************************\
+ * *
+ * Driver init/exit *
+ * *
+\*****************************************************************************/
+
+static int __init sdhci_fsl_init(void)
+{
+ return platform_driver_register(&sdhci_fsl_driver);
+}
+
+static void __exit sdhci_fsl_exit(void)
+{
+ platform_driver_unregister(&sdhci_fsl_driver);
+}
+
+module_init(sdhci_fsl_init);
+module_exit(sdhci_fsl_exit);
+
+MODULE_DESCRIPTION("IMX Secure Digital Host Controller Interface driver");
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:sdhci-fsl");
--
1.7.0
--
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