mach-mx31_3ds: Add support for the MMC slot of the personality board

Signed-off-by: Alberto Panizzo <alberto@amarulasolutions.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 99 insertions, 0 deletions

diff --git a/arch/arm/mach-mx3/mach-mx31_3ds.c b/arch/arm/mach-mx3/mach-mx31_3ds.c
index f1dbb9d4a84..cff920696e7 100644
--- a/arch/arm/mach-mx3/mach-mx31_3ds.c
+++ b/arch/arm/mach-mx3/mach-mx31_3ds.c
@@ -35,6 +35,7 @@
 #include <mach/iomux-mx3.h>
 #include <mach/3ds_debugboard.h>
 #include <mach/ulpi.h>
+#include <mach/mmc.h>
 
 #include "devices-imx31.h"
 #include "devices.h"
@@ -99,6 +100,85 @@ static int mx31_3ds_pins[] = {
         /* I2C1 */
         MX31_PIN_I2C_CLK__I2C1_SCL,
         MX31_PIN_I2C_DAT__I2C1_SDA,
+        /* SDHC1 */
+        MX31_PIN_SD1_DATA3__SD1_DATA3,
+        MX31_PIN_SD1_DATA2__SD1_DATA2,
+        MX31_PIN_SD1_DATA1__SD1_DATA1,
+        MX31_PIN_SD1_DATA0__SD1_DATA0,
+        MX31_PIN_SD1_CLK__SD1_CLK,
+        MX31_PIN_SD1_CMD__SD1_CMD,
+        MX31_PIN_GPIO3_1__GPIO3_1, /* Card detect */
+        MX31_PIN_GPIO3_0__GPIO3_0, /* OE */
+};
+
+/*
+ * Support for SD card slot in personality board
+ */
+#define MX31_3DS_GPIO_SDHC1_CD IOMUX_TO_GPIO(MX31_PIN_GPIO3_1)
+#define MX31_3DS_GPIO_SDHC1_BE IOMUX_TO_GPIO(MX31_PIN_GPIO3_0)
+
+static struct gpio mx31_3ds_sdhc1_gpios[] = {
+        { MX31_3DS_GPIO_SDHC1_CD, GPIOF_IN, "sdhc1-card-detect" },
+        { MX31_3DS_GPIO_SDHC1_BE, GPIOF_OUT_INIT_LOW, "sdhc1-bus-en" },
+};
+
+static int mx31_3ds_sdhc1_init(struct device *dev,
+                               irq_handler_t detect_irq,
+                               void *data)
+{
+        int ret;
+
+        ret = gpio_request_array(mx31_3ds_sdhc1_gpios,
+                                 ARRAY_SIZE(mx31_3ds_sdhc1_gpios));
+        if (ret) {
+                pr_warning("Unable to request the SD/MMC GPIOs.\n");
+                return ret;
+        }
+
+        ret = request_irq(IOMUX_TO_IRQ(MX31_PIN_GPIO3_1),
+                          detect_irq, IRQF_DISABLED |
+                          IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+                          "sdhc1-detect", data);
+        if (ret) {
+                pr_warning("Unable to request the SD/MMC card-detect IRQ.\n");
+                goto gpio_free;
+        }
+
+        return 0;
+
+gpio_free:
+        gpio_free_array(mx31_3ds_sdhc1_gpios,
+                        ARRAY_SIZE(mx31_3ds_sdhc1_gpios));
+        return ret;
+}
+
+static void mx31_3ds_sdhc1_exit(struct device *dev, void *data)
+{
+        free_irq(IOMUX_TO_IRQ(MX31_PIN_GPIO3_1), data);
+        gpio_free_array(mx31_3ds_sdhc1_gpios,
+                         ARRAY_SIZE(mx31_3ds_sdhc1_gpios));
+}
+
+static void mx31_3ds_sdhc1_setpower(struct device *dev, unsigned int vdd)
+{
+        /*
+         * While the voltage stuff is done by the driver, activate the
+         * Buffer Enable Pin only if there is a card in slot to fix the card
+         * voltage issue caused by bi-directional chip TXB0108 on 3Stack.
+         * Done here because at this stage we have for sure a debounced value
+         * of the presence of the card, showed by the value of vdd.
+         * 7 == ilog2(MMC_VDD_165_195)
+         */
+        if (vdd > 7)
+                gpio_set_value(MX31_3DS_GPIO_SDHC1_BE, 1);
+        else
+                gpio_set_value(MX31_3DS_GPIO_SDHC1_BE, 0);
+}
+
+static struct imxmmc_platform_data sdhc1_pdata = {
+        .init           = mx31_3ds_sdhc1_init,
+        .exit           = mx31_3ds_sdhc1_exit,
+        .setpower       = mx31_3ds_sdhc1_setpower,
 };
 
 /*
@@ -137,6 +217,21 @@ static struct regulator_init_data gpo_init = {
         }
 };
 
+static struct regulator_consumer_supply vmmc2_consumers[] = {
+        REGULATOR_SUPPLY("vmmc", "mxc-mmc.0"),
+};
+
+static struct regulator_init_data vmmc2_init = {
+        .constraints = {
+                .min_uV = 3000000,
+                .max_uV = 3000000,
+                .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE |
+                                  REGULATOR_CHANGE_STATUS,
+        },
+        .num_consumer_supplies = ARRAY_SIZE(vmmc2_consumers),
+        .consumer_supplies = vmmc2_consumers,
+};
+
 static struct mc13xxx_regulator_init_data mx31_3ds_regulators[] = {
         {
                 .id = MC13783_REG_PWGT1SPI, /* Power Gate for ARM core. */
@@ -151,6 +246,9 @@ static struct mc13xxx_regulator_init_data mx31_3ds_regulators[] = {
         }, {
                 .id = MC13783_REG_GPO3, /* Turn on 3.3V */
                 .init_data = &gpo_init,
+        }, {
+                .id = MC13783_REG_VMMC2, /* Power MMC/SD, WiFi/Bluetooth. */
+                .init_data = &vmmc2_init,
         },
 };
 
@@ -362,6 +460,7 @@ static void __init mx31_3ds_init(void)
                                     "devices on the debug board are unusable.\n");
         imx31_add_imx2_wdt(NULL);
         imx31_add_imx_i2c0(&mx31_3ds_i2c0_data);
+        imx31_add_mxc_mmc(0, &sdhc1_pdata);
 }
 
 static void __init mx31_3ds_timer_init(void)