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spi: tegra20: Add support for mode selection

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Respect the mode passed in set_mode ops.

Signed-off-by: Mirza Krak <mirza.krak@hostmobility.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
This commit is contained in:
Mirza Krak 2015-09-08 10:30:49 +02:00 committed by Jagan Teki
parent a22bba81e4
commit 5cb1b7b395
1 changed files with 21 additions and 0 deletions
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21
drivers/spi/tegra20_slink.c
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@ -36,6 +36,11 @@ DECLARE_GLOBAL_DATA_PTR;
#define SLINK_CMD_ENB (1 << 31)
#define SLINK_CMD_GO (1 << 30)
#define SLINK_CMD_M_S (1 << 28)
#define SLINK_CMD_IDLE_SCLK_DRIVE_LOW (0 << 24)
#define SLINK_CMD_IDLE_SCLK_DRIVE_HIGH (1 << 24)
#define SLINK_CMD_IDLE_SCLK_PULL_LOW (2 << 24)
#define SLINK_CMD_IDLE_SCLK_PULL_HIGH (3 << 24)
#define SLINK_CMD_IDLE_SCLK_MASK (3 << 24)
#define SLINK_CMD_CK_SDA (1 << 21)
#define SLINK_CMD_CS_POL (1 << 13)
#define SLINK_CMD_CS_VAL (1 << 12)
@ -331,6 +336,22 @@ static int tegra30_spi_set_speed(struct udevice *bus, uint speed)
static int tegra30_spi_set_mode(struct udevice *bus, uint mode)
{
struct tegra30_spi_priv *priv = dev_get_priv(bus);
struct spi_regs *regs = priv->regs;
u32 reg;
reg = readl(&regs->command);
/* Set CPOL and CPHA */
reg &= ~(SLINK_CMD_IDLE_SCLK_MASK | SLINK_CMD_CK_SDA);
if (mode & SPI_CPHA)
reg |= SLINK_CMD_CK_SDA;
if (mode & SPI_CPOL)
reg |= SLINK_CMD_IDLE_SCLK_DRIVE_HIGH;
else
reg |= SLINK_CMD_IDLE_SCLK_DRIVE_LOW;
writel(reg, &regs->command);
priv->mode = mode;
debug("%s: regs=%p, mode=%d\n", __func__, priv->regs, priv->mode);