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authorPierre Ossman <drzeus@drzeus.cx>2007-05-22 20:25:21 +0200
committerPierre Ossman <drzeus@drzeus.cx>2007-09-23 19:42:37 +0200
commitb2bcc798bbb482b2909801280f3c4aff8cbbf5be (patch)
tree74b1b4e6876fbc7187f67cc2b36ed03ae7c59acc
parent5c4e6f1301649d5b29dd0f70e6da83e728ab5ca5 (diff)
downloadop-kernel-dev-b2bcc798bbb482b2909801280f3c4aff8cbbf5be.zip
op-kernel-dev-b2bcc798bbb482b2909801280f3c4aff8cbbf5be.tar.gz
mmc: implement SDIO IO_RW_DIRECT operation
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
-rw-r--r--drivers/mmc/core/sdio_ops.c37
-rw-r--r--drivers/mmc/core/sdio_ops.h2
-rw-r--r--include/linux/mmc/core.h1
-rw-r--r--include/linux/mmc/sdio.h34
4 files changed, 74 insertions, 0 deletions
diff --git a/drivers/mmc/core/sdio_ops.c b/drivers/mmc/core/sdio_ops.c
index d6f9f9d..31233f7 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 d8c9829..f0e9d69 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 8faa436..43a9273 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 d1a0b15..e5f06de 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
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