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spi: mvebu: add LSB support 

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Uwe Kleine-König 2016-12-08 11:52:25 +01:00 committed by Sascha Hauer
parent 34e083ea64
commit 7251966266
1 changed files with 24 additions and 4 deletions
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28
drivers/spi/mvebu_spi.c
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@ -31,8 +31,13 @@
#define IF_READ_READY BIT(1)
#define IF_CS_ENABLE BIT(0)
#define SPI_IF_CONFIG 0x04
#define IF_RXLSBF BIT(14)
#define IF_TXLSBF BIT(13)
#define IF_CLK_DIV(x) ((x) << 11)
#define IF_CLK_DIV_MASK (0x7 << 11)
#define IF_FAST_READ BIT(10)
#define IF_ADDRESS_LEN_4BYTE (3 << 8)
#define IF_ADDRESS_LEN_3BYTE (2 << 8)
@ -192,6 +197,8 @@ static int dove_spi_set_baudrate(struct mvebu_spi *p, u32 speed)
static int mvebu_spi_set_mode(struct mvebu_spi *p, u8 mode)
{
u32 val;
/*
* From public datasheets of Orion SoCs, it is unclear
* if the SPI controller supports setting CPOL/CPHA.
@ -202,12 +209,19 @@ static int mvebu_spi_set_mode(struct mvebu_spi *p, u8 mode)
* other mode than SPI_MODE0.
*/
if ((mode & (SPI_CPOL|SPI_CPHA)) == SPI_MODE_0)
return 0;
if ((mode & (SPI_CPOL|SPI_CPHA)) != SPI_MODE_0) {
pr_err("%s: unsupported SPI mode %02x\n", __func__, mode);
return -EINVAL;
}
pr_err("%s: unsupported SPI mode %02x\n", __func__, mode);
val = readl(p->base + SPI_IF_CONFIG);
if (mode & SPI_LSB_FIRST)
val |= IF_RXLSBF | IF_TXLSBF;
else
val &= ~(IF_RXLSBF | IF_TXLSBF);
writel(val, p->base + SPI_IF_CONFIG);
return -EINVAL;
return 0;
}
static int mvebu_spi_setup(struct spi_device *spi)
@ -293,6 +307,12 @@ static int mvebu_spi_transfer(struct spi_device *spi, struct spi_message *msg)
int ret;
struct mvebu_spi *priv = priv_from_spi_device(spi);
ret = mvebu_spi_set_mode(priv, spi->mode);
if (ret) {
dev_err(&spi->dev, "Failed to set mode (0x%x)\n", (unsigned)spi->mode);
return ret;
}
ret = mvebu_spi_set_cs(priv, spi->chip_select, spi->mode, true);
if (ret)
return ret;