[U-Boot] [PATCH v4 1/3] spi: atmel_spi: using ip version to check whether has wdrbt

[Josh Wu]

From: Bo Shen <voice.shen at atmel.com>

Using IP version to check whether it has wdrbt bit in mode register

Tested in at91sam9x5ek and at91sam9n12ek.

Signed-off-by: Bo Shen <voice.shen at atmel.com>
[fix warning about incompatible parameter]
Signed-off-by: Josh Wu <josh.wu at atmel.com>
---
changes since v3:
  - rebase on top of atmel master tree.

 drivers/spi/atmel_spi.c |   15 ++++++++++++---
 drivers/spi/atmel_spi.h |    2 +-
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index f4b1bad..52594e3 100644
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -30,6 +30,15 @@
 
 #include "atmel_spi.h"
 
+static int spi_has_wdrbt(struct atmel_spi_slave *slave)
+{
+	unsigned int ver;
+
+	ver = spi_readl(slave, VERSION);
+
+	return (ATMEL_SPI_VERSION_REV(ver) >= 0x210);
+}
+
 void spi_init()
 {
 
@@ -90,10 +99,10 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
 
 	as->regs = regs;
 	as->mr = ATMEL_SPI_MR_MSTR | ATMEL_SPI_MR_MODFDIS
-#if defined(CONFIG_AT91SAM9X5) || defined(CONFIG_AT91SAM9M10G45)
-			| ATMEL_SPI_MR_WDRBT
-#endif
 			| ATMEL_SPI_MR_PCS(~(1 << cs) & 0xf);
+	if (spi_has_wdrbt(as))
+		as->mr |= ATMEL_SPI_MR_WDRBT;
+
 	spi_writel(as, CSR(cs), csrx);
 
 	return &as->slave;
diff --git a/drivers/spi/atmel_spi.h b/drivers/spi/atmel_spi.h
index 057de9a..d240945 100644
--- a/drivers/spi/atmel_spi.h
+++ b/drivers/spi/atmel_spi.h
@@ -64,7 +64,7 @@
 #define ATMEL_SPI_CSRx_DLYBCT(x)	((x) << 24)
 
 /* Bits in VERSION */
-#define ATMEL_SPI_VERSION_REV(x)	((x) << 0)
+#define ATMEL_SPI_VERSION_REV(x)	((x) & 0xfff)
 #define ATMEL_SPI_VERSION_MFN(x)	((x) << 16)
 
 /* Constants for CSRx:BITS */
-- 
1.7.9.5