Commit 97ed465b authored by Wenyou Yang's avatar Wenyou Yang Committed by Mark Brown
Browse files

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



Signed-off-by: default avatarWenyou Yang <wenyou.yang@atmel.com>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent d4820b74

drivers/spi/spi-atmel.c

+12 −13
Original line number Diff line number Diff line
@@ -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)
@@ -269,17 +264,21 @@ 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_writel(as, MR,

					SPI_BF(PCS, ~(0x01 << spi->chip_select))

					| SPI_BIT(MODFDIS)

					| SPI_BIT(MSTR));

		}

		mr = spi_readl(as, MR);