summaryrefslogtreecommitdiff
path: root/drivers/spi/tegra20_slink.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/spi/tegra20_slink.c')
-rw-r--r--drivers/spi/tegra20_slink.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/spi/tegra20_slink.c b/drivers/spi/tegra20_slink.c
index fbb665b..144716f 100644
--- a/drivers/spi/tegra20_slink.c
+++ b/drivers/spi/tegra20_slink.c
@@ -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);