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mmc: implement SDIO IO_RW_DIRECT operation 

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
hifive-unleashed-5.1
Pierre Ossman 2007-05-22 20:25:21 +02:00
parent 5c4e6f1301
commit b2bcc798bb
4 changed files with 74 additions and 0 deletions
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37
drivers/mmc/core/sdio_ops.c
View File

@ -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;
}

2
drivers/mmc/core/sdio_ops.h
View File

@ -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

1
include/linux/mmc/core.h
View File

@ -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)

34
include/linux/mmc/sdio.h
View File

@ -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