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spi: kirkwood_spi: implement mvebu_spi_set_mode() 

Set the appropriate bits in the interface config register based
on the SPI_ mode flags.

Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Jagan Teki <jteki@openedev.com>
Signed-off-by: Chris Packham <judge.packham@gmail.com>
This commit is contained in:
Chris Packham 2016-10-27 21:16:05 +13:00 committed by Jagan Teki
parent c2cbd164ea
commit ebfa18cb3d
2 changed files with 19 additions and 0 deletions
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4
arch/arm/include/asm/arch-mvebu/spi.h
View File

@ -52,6 +52,10 @@ struct kwspi_registers {
#define KWSPI_ADRLEN_3BYTE (2 << 8)
#define KWSPI_ADRLEN_4BYTE (3 << 8)
#define KWSPI_ADRLEN_MASK (3 << 8)
#define KWSPI_CPOL (1 << 11)
#define KWSPI_CPHA (1 << 12)
#define KWSPI_TXLSBF (1 << 13)
#define KWSPI_RXLSBF (1 << 14)
#define KWSPI_IRQUNMASK 1 /* unmask SPI interrupt */
#define KWSPI_IRQMASK 0 /* mask SPI interrupt */

15
drivers/spi/kirkwood_spi.c
View File

@ -271,6 +271,21 @@ static int mvebu_spi_set_speed(struct udevice *bus, uint hz)
static int mvebu_spi_set_mode(struct udevice *bus, uint mode)
{
struct mvebu_spi_platdata *plat = dev_get_platdata(bus);
struct kwspi_registers *reg = plat->spireg;
u32 data = readl(&reg->cfg);
data &= ~(KWSPI_CPHA | KWSPI_CPOL | KWSPI_RXLSBF | KWSPI_TXLSBF);
if (mode & SPI_CPHA)
data |= KWSPI_CPHA;
if (mode & SPI_CPOL)
data |= KWSPI_CPOL;
if (mode & SPI_LSB_FIRST)
data |= (KWSPI_RXLSBF | KWSPI_TXLSBF);
writel(data, &reg->cfg);
return 0;
}