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path: root/drivers/spi/spi_bfin5xx.c
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Diffstat (limited to 'drivers/spi/spi_bfin5xx.c')
-rw-r--r--drivers/spi/spi_bfin5xx.c33
1 files changed, 27 insertions, 6 deletions
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index 3736c3596a4..6150a8cfb82 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -188,8 +188,7 @@ static void bfin_spi_cs_active(struct driver_data *drv_data, struct chip_data *c
if (likely(chip->chip_select_num)) {
u16 flag = read_FLAG(drv_data);
- flag |= chip->flag;
- flag &= ~(chip->flag << 8);
+ flag &= ~chip->flag;
write_FLAG(drv_data, flag);
} else {
@@ -202,8 +201,7 @@ static void bfin_spi_cs_deactive(struct driver_data *drv_data, struct chip_data
if (likely(chip->chip_select_num)) {
u16 flag = read_FLAG(drv_data);
- flag &= ~chip->flag;
- flag |= (chip->flag << 8);
+ flag |= chip->flag;
write_FLAG(drv_data, flag);
} else {
@@ -215,6 +213,25 @@ static void bfin_spi_cs_deactive(struct driver_data *drv_data, struct chip_data
udelay(chip->cs_chg_udelay);
}
+/* enable or disable the pin muxed by GPIO and SPI CS to work as SPI CS */
+static inline void bfin_spi_cs_enable(struct driver_data *drv_data, struct chip_data *chip)
+{
+ u16 flag = read_FLAG(drv_data);
+
+ flag |= (chip->flag >> 8);
+
+ write_FLAG(drv_data, flag);
+}
+
+static inline void bfin_spi_cs_disable(struct driver_data *drv_data, struct chip_data *chip)
+{
+ u16 flag = read_FLAG(drv_data);
+
+ flag &= ~(chip->flag >> 8);
+
+ write_FLAG(drv_data, flag);
+}
+
/* stop controller and re-config current chip*/
static void bfin_spi_restore_state(struct driver_data *drv_data)
{
@@ -1169,7 +1186,7 @@ static int bfin_spi_setup(struct spi_device *spi)
* SPI_BAUD, not the real baudrate
*/
chip->baud = hz_to_spi_baud(spi->max_speed_hz);
- chip->flag = 1 << (spi->chip_select);
+ chip->flag = (1 << (spi->chip_select)) << 8;
chip->chip_select_num = spi->chip_select;
switch (chip->bits_per_word) {
@@ -1268,6 +1285,7 @@ static int bfin_spi_setup(struct spi_device *spi)
}
}
+ bfin_spi_cs_enable(drv_data, chip);
bfin_spi_cs_deactive(drv_data, chip);
return 0;
@@ -1299,14 +1317,17 @@ static int bfin_spi_setup(struct spi_device *spi)
static void bfin_spi_cleanup(struct spi_device *spi)
{
struct chip_data *chip = spi_get_ctldata(spi);
+ struct driver_data *drv_data = spi_master_get_devdata(spi->master);
if (!chip)
return;
if ((chip->chip_select_num > 0)
- && (chip->chip_select_num <= spi->master->num_chipselect))
+ && (chip->chip_select_num <= spi->master->num_chipselect)) {
peripheral_free(ssel[spi->master->bus_num]
[chip->chip_select_num-1]);
+ bfin_spi_cs_disable(drv_data, chip);
+ }
if (chip->chip_select_num == 0)
gpio_free(chip->cs_gpio);