mmc: sdhci-esdhc-imx: extend card_detect and write_protect support for mx5

The patch extends card_detect and write_protect support to get mx5
family and more scenarios supported.  The changes include:

 * Turn platform_data from optional to mandatory
 * Add cd_types and wp_types into platform_data to cover more use
   cases
 * Remove the use of flag ESDHC_FLAG_GPIO_FOR_CD
 * Adjust some machine codes to adopt the platform_data changes
 * Work around the issue that software reset will get card detection
   circuit stop working

With this patch, card_detect and write_protect gets supported on
mx5 based platforms.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Chris Ball <cjb@laptop.org>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Acked-by: Chris Ball <cjb@laptop.org>

1 files changed, 21 insertions, 4 deletions

diff --git a/arch/arm/plat-mxc/include/mach/esdhc.h b/arch/arm/plat-mxc/include/mach/esdhc.h
index 86003f411755..aaf97481f413 100644
--- a/arch/arm/plat-mxc/include/mach/esdhc.h
+++ b/arch/arm/plat-mxc/include/mach/esdhc.h
@@ -10,17 +10,34 @@
 #ifndef __ASM_ARCH_IMX_ESDHC_H
 #define __ASM_ARCH_IMX_ESDHC_H
 
+enum wp_types {
+        ESDHC_WP_NONE,          /* no WP, neither controller nor gpio */
+        ESDHC_WP_CONTROLLER,    /* mmc controller internal WP */
+        ESDHC_WP_GPIO,          /* external gpio pin for WP */
+};
+
+enum cd_types {
+        ESDHC_CD_NONE,          /* no CD, neither controller nor gpio */
+        ESDHC_CD_CONTROLLER,    /* mmc controller internal CD */
+        ESDHC_CD_GPIO,          /* external gpio pin for CD */
+        ESDHC_CD_PERMANENT,     /* no CD, card permanently wired to host */
+};
+
 /**
- * struct esdhc_platform_data - optional platform data for esdhc on i.MX
+ * struct esdhc_platform_data - platform data for esdhc on i.MX
  *
- * strongly recommended for i.MX25/35, not needed for other variants
+ * ESDHC_WP(CD)_CONTROLLER type is not available on i.MX25/35.
  *
- * @wp_gpio:    gpio for write_protect (-EINVAL if unused)
- * @cd_gpio:    gpio for card_detect interrupt (-EINVAL if unused)
+ * @wp_gpio:    gpio for write_protect
+ * @cd_gpio:    gpio for card_detect interrupt
+ * @wp_type:    type of write_protect method (see wp_types enum above)
+ * @cd_type:    type of card_detect method (see cd_types enum above)
  */
 
 struct esdhc_platform_data {
         unsigned int wp_gpio;
         unsigned int cd_gpio;
+        enum wp_types wp_type;
+        enum cd_types cd_type;
 };
 #endif /* __ASM_ARCH_IMX_ESDHC_H */