diff options
| author | Wenyou Yang <wenyou.yang@atmel.com> | 2013-03-19 15:43:01 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-04-01 14:40:59 +0100 |
| commit | 97ed465b4d3b6ec6ab12d1ee0cea48a66891c985 (patch) | |
| tree | 93baab592da444f8761c9f4db15e281047862c4e /drivers/spi | |
| parent | d4820b7496219edd9a7055022681364d304525f7 (diff) | |
| download | op-kernel-dev-97ed465b4d3b6ec6ab12d1ee0cea48a66891c985.zip op-kernel-dev-97ed465b4d3b6ec6ab12d1ee0cea48a66891c985.tar.gz | |
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>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-atmel.c | 25 |
1 files changed, 12 insertions, 13 deletions
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c index af3dbab..26c126b 100644 --- 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); |
