MMC headers learn about SPI

Teach the MMC/SD/SDIO system headers that some hosts use SPI mode

 - New host capabilities and status bits
    * MMC_CAP_SPI, with mmc_host_is_spi() test
    * mmc_host.use_spi_crc flag

 - SPI-specific declarations:
    * Response types, MMC_RSP_SPI_R*
    * Two SPI-only commands
    * Status bits used native to SPI:  R1_SPI_*, R2_SPI_*

 - Fix a few (unrelated) whitespace bugs in the headers.

 - Reorder a few mmc_host fields, removing several bytes of padding

None of these changes affect current code.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 24 insertions, 2 deletions

diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 8945da9b54f..d0c3abed74c 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -25,14 +25,20 @@ struct mmc_command {
 #define MMC_RSP_CRC     (1 << 2)                /* expect valid crc */
 #define MMC_RSP_BUSY    (1 << 3)                /* card may send busy */
 #define MMC_RSP_OPCODE  (1 << 4)                /* response contains opcode */
-#define MMC_CMD_MASK    (3 << 5)                /* command type */
+
+#define MMC_CMD_MASK    (3 << 5)                /* non-SPI command type */
 #define MMC_CMD_AC      (0 << 5)
 #define MMC_CMD_ADTC    (1 << 5)
 #define MMC_CMD_BC      (2 << 5)
 #define MMC_CMD_BCR     (3 << 5)
 
+#define MMC_RSP_SPI_S1  (1 << 7)                /* one status byte */
+#define MMC_RSP_SPI_S2  (1 << 8)                /* second byte */
+#define MMC_RSP_SPI_B4  (1 << 9)                /* four data bytes */
+#define MMC_RSP_SPI_BUSY (1 << 10)              /* card may send busy */
+
 /*
- * These are the response types, and correspond to valid bit
+ * These are the native response types, and correspond to valid bit
  * patterns of the above flags.  One additional valid pattern
  * is all zeros, which means we don't expect a response.
  */
@@ -49,6 +55,22 @@ struct mmc_command {
 #define mmc_resp_type(cmd)      ((cmd)->flags & (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC|MMC_RSP_BUSY|MMC_RSP_OPCODE))
 
 /*
+ * These are the SPI response types for MMC, SD, and SDIO cards.
+ * Commands return R1, with maybe more info.  Zero is an error type;
+ * callers must always provide the appropriate MMC_RSP_SPI_Rx flags.
+ */
+#define MMC_RSP_SPI_R1  (MMC_RSP_SPI_S1)
+#define MMC_RSP_SPI_R1B (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY)
+#define MMC_RSP_SPI_R2  (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
+#define MMC_RSP_SPI_R3  (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
+#define MMC_RSP_SPI_R4  (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
+#define MMC_RSP_SPI_R5  (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
+#define MMC_RSP_SPI_R7  (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
+
+#define mmc_spi_resp_type(cmd)  ((cmd)->flags & \
+                (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY|MMC_RSP_SPI_S2|MMC_RSP_SPI_B4))
+
+/*
  * These are the command types.
  */
 #define mmc_cmd_type(cmd)       ((cmd)->flags & MMC_CMD_MASK)