mmc: Add a MX2/MX3 specific SDHC driver

This patch adds a MX2/MX3 specific SDHC driver. The hardware is basically
the same as in the MX1, but unlike the MX1 controller the MX2
controller just works as expected. Since the MX1 driver has more
workarounds for bugs than anything else I had no success with supporting
MX1 and MX2 in a sane way in one driver.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 36 insertions, 0 deletions

diff --git a/arch/arm/plat-mxc/include/mach/mmc.h b/arch/arm/plat-mxc/include/mach/mmc.h
new file mode 100644
index 000000000000..de2128dada5c
--- /dev/null
+++ b/arch/arm/plat-mxc/include/mach/mmc.h
@@ -0,0 +1,36 @@
+#ifndef ASMARM_ARCH_MMC_H
+#define ASMARM_ARCH_MMC_H
+
+#include <linux/mmc/host.h>
+
+struct device;
+
+/* board specific SDHC data, optional.
+ * If not present, a writable card with 3,3V is assumed.
+ */
+struct imxmmc_platform_data {
+        /* Return values for the get_ro callback should be:
+         *   0 for a read/write card
+         *   1 for a read-only card
+         *   -ENOSYS when not supported (equal to NULL callback)
+         *   or a negative errno value when something bad happened
+         */
+        int (*get_ro)(struct device *);
+
+        /* board specific hook to (de)initialize the SD slot.
+         * The board code can call 'handler' on a card detection
+         * change giving data as argument.
+         */
+        int (*init)(struct device *dev, irq_handler_t handler, void *data);
+        void (*exit)(struct device *dev, void *data);
+
+        /* available voltages. If not given, assume
+         * MMC_VDD_32_33 | MMC_VDD_33_34
+         */
+        unsigned int ocr_avail;
+
+        /* adjust slot voltage */
+        void (*setpower)(struct device *, unsigned int vdd);
+};
+
+#endif