mmc: implement SDIO IO_RW_DIRECT operation

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

2 files changed, 39 insertions, 0 deletions

diff --git a/drivers/mmc/core/sdio_ops.c b/drivers/mmc/core/sdio_ops.c
index d6f9f9d8517..31233f7b55c 100644
--- a/drivers/mmc/core/sdio_ops.c
+++ b/drivers/mmc/core/sdio_ops.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
 #include <linux/mmc/mmc.h>
 #include <linux/mmc/sdio.h>
 
@@ -47,3 +48,39 @@ int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
         return err;
 }
 
+int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
+        unsigned addr, u8 in, u8* out)
+{
+        struct mmc_command cmd;
+        int err;
+
+        BUG_ON(!card);
+        BUG_ON(fn > 7);
+
+        memset(&cmd, 0, sizeof(struct mmc_command));
+
+        cmd.opcode = SD_IO_RW_DIRECT;
+        cmd.arg = write ? 0x80000000 : 0x00000000;
+        cmd.arg |= fn << 28;
+        cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
+        cmd.arg |= addr << 9;
+        cmd.arg |= in;
+        cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;
+
+        err = mmc_wait_for_cmd(card->host, &cmd, 0);
+        if (err)
+                return err;
+
+        if (cmd.resp[0] & R5_ERROR)
+                return -EIO;
+        if (cmd.resp[0] & R5_FUNCTION_NUMBER)
+                return -EINVAL;
+        if (cmd.resp[0] & R5_OUT_OF_RANGE)
+                return -ERANGE;
+
+        if (out)
+                *out = cmd.resp[0] & 0xFF;
+
+        return 0;
+}
+
diff --git a/drivers/mmc/core/sdio_ops.h b/drivers/mmc/core/sdio_ops.h
index d8c982976f1..f0e9d69e5ce 100644
--- a/drivers/mmc/core/sdio_ops.h
+++ b/drivers/mmc/core/sdio_ops.h
@@ -13,6 +13,8 @@
 #define _MMC_SDIO_OPS_H
 
 int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr);
+int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
+        unsigned addr, u8 in, u8* out);
 
 #endif