mmc: implement SDIO IO_RW_DIRECT operation

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

4 files changed, 74 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
 
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 8faa436c557..43a92736be6 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -42,6 +42,7 @@ struct mmc_command {
 #define MMC_RSP_R2      (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
 #define MMC_RSP_R3      (MMC_RSP_PRESENT)
 #define MMC_RSP_R4      (MMC_RSP_PRESENT)
+#define MMC_RSP_R5      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
 #define MMC_RSP_R6      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
 #define MMC_RSP_R7      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
 
diff --git a/include/linux/mmc/sdio.h b/include/linux/mmc/sdio.h
index d1a0b15cdfd..e5f06de7d52 100644
--- a/include/linux/mmc/sdio.h
+++ b/include/linux/mmc/sdio.h
@@ -14,6 +14,40 @@
 
 /* SDIO commands                         type  argument     response */
 #define SD_IO_SEND_OP_COND          5 /* bcr  [23:0] OCR         R4  */
+#define SD_IO_RW_DIRECT            52 /* ac   [31:0] See below   R5  */
+
+/*
+ * SD_IO_RW_DIRECT argument format:
+ *
+ *      [31] R/W flag
+ *      [30:28] Function number
+ *      [27] RAW flag
+ *      [25:9] Register address
+ *      [7:0] Data
+ */
+
+/*
+  SDIO status in R5
+  Type
+        e : error bit
+        s : status bit
+        r : detected and set for the actual command response
+        x : detected and set during command execution. the host must poll
+            the card by sending status command in order to read these bits.
+  Clear condition
+        a : according to the card state
+        b : always related to the previous command. Reception of
+            a valid command will clear it (with a delay of one command)
+        c : clear by read
+ */
+
+#define R5_COM_CRC_ERROR        (1 << 15)       /* er, b */
+#define R5_ILLEGAL_COMMAND      (1 << 14)       /* er, b */
+#define R5_ERROR                (1 << 11)       /* erx, c */
+#define R5_FUNCTION_NUMBER      (1 << 9)        /* er, c */
+#define R5_OUT_OF_RANGE         (1 << 8)        /* er, c */
+#define R5_STATUS(x)            (x & 0xCB00)
+#define R5_IO_CURRENT_STATE(x)  ((x & 0x3000) >> 12) /* s, b */
 
 #endif