tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
mmc: implement SDIO IO_RW_DIRECT operation
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
+74
+37
drivers/mmc/core/sdio_ops.c
+37
drivers/mmc/core/sdio_ops.c
···
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*/
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#include <linux/mmc/host.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/mmc.h>
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#include <linux/mmc/sdio.h>
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···
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*rocr = cmd.resp[0];
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return err;
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}
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int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
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unsigned addr, u8 in, u8* out)
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{
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struct mmc_command cmd;
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int err;
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BUG_ON(!card);
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BUG_ON(fn > 7);
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = SD_IO_RW_DIRECT;
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cmd.arg = write ? 0x80000000 : 0x00000000;
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cmd.arg |= fn << 28;
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cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
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cmd.arg |= addr << 9;
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cmd.arg |= in;
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cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;
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err = mmc_wait_for_cmd(card->host, &cmd, 0);
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if (err)
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return err;
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if (cmd.resp[0] & R5_ERROR)
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return -EIO;
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if (cmd.resp[0] & R5_FUNCTION_NUMBER)
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return -EINVAL;
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if (cmd.resp[0] & R5_OUT_OF_RANGE)
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return -ERANGE;
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if (out)
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*out = cmd.resp[0] & 0xFF;
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return 0;
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}
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+2
drivers/mmc/core/sdio_ops.h
+2
drivers/mmc/core/sdio_ops.h
+1
include/linux/mmc/core.h
+1
include/linux/mmc/core.h
···
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#define MMC_RSP_R2 (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
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#define MMC_RSP_R3 (MMC_RSP_PRESENT)
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#define MMC_RSP_R4 (MMC_RSP_PRESENT)
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#define MMC_RSP_R5 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
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#define MMC_RSP_R6 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
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#define MMC_RSP_R7 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
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+34
include/linux/mmc/sdio.h
+34
include/linux/mmc/sdio.h
···
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/* SDIO commands type argument response */
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#define SD_IO_SEND_OP_COND 5 /* bcr [23:0] OCR R4 */
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#define SD_IO_RW_DIRECT 52 /* ac [31:0] See below R5 */
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/*
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* SD_IO_RW_DIRECT argument format:
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*
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* [31] R/W flag
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* [30:28] Function number
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* [27] RAW flag
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* [25:9] Register address
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* [7:0] Data
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*/
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/*
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SDIO status in R5
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Type
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e : error bit
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s : status bit
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r : detected and set for the actual command response
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x : detected and set during command execution. the host must poll
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the card by sending status command in order to read these bits.
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Clear condition
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a : according to the card state
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b : always related to the previous command. Reception of
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a valid command will clear it (with a delay of one command)
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c : clear by read
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*/
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#define R5_COM_CRC_ERROR (1 << 15) /* er, b */
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#define R5_ILLEGAL_COMMAND (1 << 14) /* er, b */
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#define R5_ERROR (1 << 11) /* erx, c */
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#define R5_FUNCTION_NUMBER (1 << 9) /* er, c */
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#define R5_OUT_OF_RANGE (1 << 8) /* er, c */
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#define R5_STATUS(x) (x & 0xCB00)
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#define R5_IO_CURRENT_STATE(x) ((x & 0x3000) >> 12) /* s, b */
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#endif
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