add CONFIG_SPI_IDLE_VAL for cf_spi.c to allow use of spi_mmc

This patch adds CONFIG_SPI_IDLE_VAL to cf_spi.c
The default setting is 0x0 to behave same as current version, in case
CONFIG_SPI_MMC is set, the value is set to 0xFFFF (all ones). In either
case, the value can be overwritten by board configuration.

Signed-off-by: Wolfgang Wegner <w.wegner@astro-kom.de>
Signed-off-by: Andy Fleming <afleming@freescale.com>

diff --git a/drivers/spi/cf_spi.c b/drivers/spi/cf_spi.c
index 722aafc73c35ab1d733338aa3df548d374e50a7f..a883da93688a1bc056b569ab859bdb6dae263dfa 100644 (file)
--- a/drivers/spi/cf_spi.c
+++ b/drivers/spi/cf_spi.c
@@ -49,6 +49,14 @@ extern void cfspi_release_bus(uint bus, uint cs);
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#ifndef CONFIG_SPI_IDLE_VAL
+#if defined(CONFIG_SPI_MMC)
+#define CONFIG_SPI_IDLE_VAL    0xFFFF
+#else
+#define CONFIG_SPI_IDLE_VAL    0x0
+#endif
+#endif
+
 #if defined(CONFIG_CF_DSPI)
 /* DSPI specific mode */
 #define SPI_MODE_MOD   0x00200000
@@ -145,7 +153,7 @@ int cfspi_xfer(struct spi_slave *slave, uint bitlen, const void *dout,
                        }
 
                        if (din != NULL) {
-                               cfspi_tx(ctrl, 0);
+                               cfspi_tx(ctrl, CONFIG_SPI_IDLE_VAL);
                                if (cfslave->charbit == 16)
                                        *spi_rd16++ = cfspi_rx();
                                else
@@ -169,7 +177,7 @@ int cfspi_xfer(struct spi_slave *slave, uint bitlen, const void *dout,
                }
 
                if (din != NULL) {
-                       cfspi_tx(ctrl, 0);
+                       cfspi_tx(ctrl, CONFIG_SPI_IDLE_VAL);
                        if (cfslave->charbit == 16)
                                *spi_rd16 = cfspi_rx();
                        else
@@ -177,7 +185,7 @@ int cfspi_xfer(struct spi_slave *slave, uint bitlen, const void *dout,
                }
        } else {
                /* dummy read */
-               cfspi_tx(ctrl, 0);
+               cfspi_tx(ctrl, CONFIG_SPI_IDLE_VAL);
                cfspi_rx();
        }