spi/spi-atmel: add support transfer on CS1,2,3, not only on CS0

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index af3dbab600d519f3d40e8be731fc59ba0e9e9374..26c126bfe02a13ade8e3d982b6856206b94d6935 100644 (file)
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -255,11 +255,6 @@ static bool atmel_spi_is_v2(struct atmel_spi *as)
  * Master on Chip Select 0.")  No workaround exists for that ... so for
  * nCS0 on that chip, we (a) don't use the GPIO, (b) can't support CS_HIGH,
  * and (c) will trigger that first erratum in some cases.
- *
- * TODO: Test if the atmel_spi_is_v2() branch below works on
- * AT91RM9200 if we use some other register than CSR0. However, don't
- * do this unconditionally since AP7000 has an errata where the BITS
- * field in CSR0 overrides all other CSRs.
  */
 
 static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
@@ -269,18 +264,22 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
        u32 mr;
 
        if (atmel_spi_is_v2(as)) {
-               /*
-                * Always use CSR0. This ensures that the clock
-                * switches to the correct idle polarity before we
-                * toggle the CS.
+               spi_writel(as, CSR0 + 4 * spi->chip_select, asd->csr);
+               /* For the low SPI version, there is a issue that PDC transfer
+                * on CS1,2,3 needs SPI_CSR0.BITS config as SPI_CSR1,2,3.BITS
                 */
                spi_writel(as, CSR0, asd->csr);
                if (as->caps.has_wdrbt) {
-                       spi_writel(as, MR, SPI_BF(PCS, 0x0e) | SPI_BIT(WDRBT)
-                               | SPI_BIT(MODFDIS) | SPI_BIT(MSTR));
+                       spi_writel(as, MR,
+                                       SPI_BF(PCS, ~(0x01 << spi->chip_select))
+                                       | SPI_BIT(WDRBT)
+                                       | SPI_BIT(MODFDIS)
+                                       | SPI_BIT(MSTR));
                } else {
-                       spi_writel(as, MR, SPI_BF(PCS, 0x0e) | SPI_BIT(MODFDIS)
-                               | SPI_BIT(MSTR));
+                       spi_writel(as, MR,
+                                       SPI_BF(PCS, ~(0x01 << spi->chip_select))
+                                       | SPI_BIT(MODFDIS)
+                                       | SPI_BIT(MSTR));
                }
                mr = spi_readl(as, MR);
                gpio_set_value(asd->npcs_pin, active);