mmc: implement SDIO IO_RW_DIRECT operation

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

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;
+}
+

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
 

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)
 

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