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authorAllen Martin <amartin@nvidia.com>2013-03-16 18:58:07 +0000
committerTom Warren <twarren@nvidia.com>2013-03-25 09:56:06 -0700
commit78f47b7353ebe1f243203dcc1ce0a2a374c08a40 (patch)
treeaafdfd503145a8bc2d16af8f2ad0f10c8dd62887 /drivers/spi/tegra20_slink.c
parent6b3a03e112cecda55b58f3de40f4fc760159979b (diff)
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spi: add common fdt SPI driver interface
Add a common interface to fdt based SPI drivers. Each driver is represented by a table entry in fdt_spi_drivers[]. If there are multiple SPI drivers in the table, the first driver to return success from spi_init() will be registered as the SPI driver. Signed-off-by: Allen Martin <amartin@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com> Reviewed-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'drivers/spi/tegra20_slink.c')
-rw-r--r--drivers/spi/tegra20_slink.c29
1 files changed, 11 insertions, 18 deletions
diff --git a/drivers/spi/tegra20_slink.c b/drivers/spi/tegra20_slink.c
index f3b0964..2ef2eb8 100644
--- a/drivers/spi/tegra20_slink.c
+++ b/drivers/spi/tegra20_slink.c
@@ -107,7 +107,7 @@ static inline struct tegra_spi_slave *to_tegra_spi(struct spi_slave *slave)
return container_of(slave, struct tegra_spi_slave, slave);
}
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+int tegra30_spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
if (bus >= CONFIG_TEGRA_SLINK_CTRLS || cs > 3 || !spi_ctrls[bus].valid)
return 0;
@@ -115,7 +115,7 @@ int spi_cs_is_valid(unsigned int bus, unsigned int cs)
return 1;
}
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+struct spi_slave *tegra30_spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
struct tegra_spi_slave *spi;
@@ -159,25 +159,20 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
return &spi->slave;
}
-void spi_free_slave(struct spi_slave *slave)
+void tegra30_spi_free_slave(struct spi_slave *slave)
{
struct tegra_spi_slave *spi = to_tegra_spi(slave);
free(spi);
}
-void spi_init(void)
+int tegra30_spi_init(int *node_list, int count)
{
struct tegra_spi_ctrl *ctrl;
int i;
int node = 0;
- int count;
- int node_list[CONFIG_TEGRA_SLINK_CTRLS];
+ int found = 0;
- count = fdtdec_find_aliases_for_id(gd->fdt_blob, "spi",
- COMPAT_NVIDIA_TEGRA20_SLINK,
- node_list,
- CONFIG_TEGRA_SLINK_CTRLS);
for (i = 0; i < count; i++) {
ctrl = &spi_ctrls[i];
node = node_list[i];
@@ -201,13 +196,15 @@ void spi_init(void)
continue;
}
ctrl->valid = 1;
+ found = 1;
debug("%s: found controller at %p, freq = %u, periph_id = %d\n",
__func__, ctrl->regs, ctrl->freq, ctrl->periph_id);
}
+ return !found;
}
-int spi_claim_bus(struct spi_slave *slave)
+int tegra30_spi_claim_bus(struct spi_slave *slave)
{
struct tegra_spi_slave *spi = to_tegra_spi(slave);
struct spi_regs *regs = spi->ctrl->regs;
@@ -232,11 +229,7 @@ int spi_claim_bus(struct spi_slave *slave)
return 0;
}
-void spi_release_bus(struct spi_slave *slave)
-{
-}
-
-void spi_cs_activate(struct spi_slave *slave)
+void tegra30_spi_cs_activate(struct spi_slave *slave)
{
struct tegra_spi_slave *spi = to_tegra_spi(slave);
struct spi_regs *regs = spi->ctrl->regs;
@@ -245,7 +238,7 @@ void spi_cs_activate(struct spi_slave *slave)
setbits_le32(&regs->command, SLINK_CMD_CS_VAL);
}
-void spi_cs_deactivate(struct spi_slave *slave)
+void tegra30_spi_cs_deactivate(struct spi_slave *slave)
{
struct tegra_spi_slave *spi = to_tegra_spi(slave);
struct spi_regs *regs = spi->ctrl->regs;
@@ -254,7 +247,7 @@ void spi_cs_deactivate(struct spi_slave *slave)
clrbits_le32(&regs->command, SLINK_CMD_CS_VAL);
}
-int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
+int tegra30_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
const void *data_out, void *data_in, unsigned long flags)
{
struct tegra_spi_slave *spi = to_tegra_spi(slave);