mx31moboard: add sdhc support (v3)

This support both sdhc1 and sdhc2 with WP and CD for the marxbot and
devboard mx31moboard baseboards.

sdhc2 is present on both, but is not directly included in the
mx31moboard file because a third baseboard (not supported yet) without
sdhc2 is planned.

Changes since v1: removed pin initialization from init/exit function and
taken different comments into account

Changes since v2: pin initialiation now is done in another patch for all
current mx31moboard pins

Signed-off-by: Valentin Longchamp <valentin.longchamp@epfl.ch>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 32 insertions, 0 deletions

diff --git a/arch/arm/mach-mx3/mx31moboard-marxbot.c b/arch/arm/mach-mx3/mx31moboard-marxbot.c
index daeb1e97da20..4fc271145b0c 100644
--- a/arch/arm/mach-mx3/mx31moboard-marxbot.c
+++ b/arch/arm/mach-mx3/mx31moboard-marxbot.c
@@ -16,7 +16,9 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#include <linux/gpio.h>
 #include <linux/init.h>
+#include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/types.h>
 
@@ -24,6 +26,7 @@
 #include <mach/hardware.h>
 #include <mach/imx-uart.h>
 #include <mach/iomux-mx3.h>
+#include <mach/mmc.h>
 
 #include "devices.h"
 
@@ -46,6 +49,33 @@ static unsigned int marxbot_pins[] = {
         MX31_PIN_TXD2__GPIO1_28,
 };
 
+#define SDHC2_CD IOMUX_TO_GPIO(MX31_PIN_ATA_DIOR)
+#define SDHC2_WP IOMUX_TO_GPIO(MX31_PIN_ATA_DIOW)
+
+static int marxbot_sdhc2_get_ro(struct device *dev)
+{
+        return gpio_get_value(SDHC2_WP);
+}
+
+static int marxbot_sdhc2_init(struct device *dev, irq_handler_t detect_irq,
+                void *data)
+{
+        return request_irq(gpio_to_irq(SDHC2_CD), detect_irq,
+                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+                "sdhc2-card-detect", data);
+}
+
+static void marxbot_sdhc2_exit(struct device *dev, void *data)
+{
+        free_irq(gpio_to_irq(SDHC2_CD), data);
+}
+
+static struct imxmmc_platform_data sdhc2_pdata = {
+        .get_ro = marxbot_sdhc2_get_ro,
+        .init   = marxbot_sdhc2_init,
+        .exit   = marxbot_sdhc2_exit,
+};
+
 /*
  * system init for baseboard usage. Will be called by mx31moboard init.
  */
@@ -55,4 +85,6 @@ void __init mx31moboard_marxbot_init(void)
 
         mxc_iomux_setup_multiple_pins(marxbot_pins, ARRAY_SIZE(marxbot_pins),
                 "marxbot");
+
+        mxc_register_device(&mxcsdhc_device1, &sdhc2_pdata);
 }