Without CRC support the mmc spi driver fails to compile with
the following:
drivers/mci/mci_spi.c:74:18: error: static declaration of 'crc7' follows non-static declaration
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/mci/mci_spi.c | 29 ++++++++++++-----------------
1 files changed, 12 insertions(+), 17 deletions(-)
diff --git a/drivers/mci/mci_spi.c b/drivers/mci/mci_spi.c
index 124e49b..653910b 100644
--- a/drivers/mci/mci_spi.c
+++ b/drivers/mci/mci_spi.c
@@ -64,23 +64,6 @@
#define RTOUT 3000000 /* 1 sec */
#define WTOUT 3000000 /* 1 sec */
-#ifndef CONFIG_MMC_SPI_CRC_ON
-/* Note that while the CRC, in general, is ignored in SPI mode, the very first
- * command must be followed by a valid CRC, since the card is not yet in SPI mode.
- * The CRC byte for a CMD0 command with a zero argument is a constant 0x4A. For
- * simplicity, this CRC byte is always sent with every command.
- */
-
-static inline u8 crc7(u8 crc, const u8 *buffer, size_t len)
-{
- /* This is the crc7 value for a CMD0 command with a zero argument.
- * It'll be left shifted and ored with '1' in mmc_spi_command_send
- * to give 0x95 (also known as the CMD0 constant CRC value...)
- */
- return 0x4A;
-}
-#endif
-
struct mmc_spi_host {
struct mci_host mci;
struct spi_device *spi;
@@ -141,6 +124,14 @@ mmc_spi_writebytes(struct mmc_spi_host *host, unsigned len, void *data)
return status;
}
+/*
+ * Note that while the CRC, in general, is ignored in SPI mode, the very first
+ * command must be followed by a valid CRC, since the card is not yet in SPI mode.
+ * The CRC byte for a CMD0 command with a zero argument is a constant 0x4A. For
+ * simplicity, this CRC byte is always sent with every command.
+ */
+#define MMC_SPI_CMD0_CRC ((0x4a << 1) | 0x1)
+
static int mmc_spi_command_send(struct mmc_spi_host *host, struct mci_cmd *cmd)
{
uint8_t r1;
@@ -153,7 +144,11 @@ static int mmc_spi_command_send(struct mmc_spi_host *host, struct mci_cmd *cmd)
command[3] = cmd->cmdarg >> 16;
command[4] = cmd->cmdarg >> 8;
command[5] = cmd->cmdarg;
+#ifdef CONFIG_MMC_SPI_CRC_ON
command[6] = (crc7(0, &command[1], 5) << 1) | 0x01;
+#else
+ command[6] = MMC_SPI_CMD0_CRC;
+#endif
mmc_spi_writebytes(host, 7, command);
--
1.7.7.1
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