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authorAllen Martin <amartin@nvidia.com>2013-01-29 13:51:24 +0000
committerTom Warren <twarren@nvidia.com>2013-02-11 10:35:24 -0700
commit8f1b46b10480e7fe140d5656c76f6f6de1739f13 (patch)
treedb0ee4ed537dd575bc868e65383c5410337c0656 /drivers/spi
parentc98f03fae083fc741a296c07120407d306c2a8c6 (diff)
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tegra: spi: add fdt support to tegra SPI SFLASH driver
Add support for configuring tegra SPI driver from devicetree. Support is keyed off CONFIG_OF_CONTROL. Add entry in seaboard dts file for spi controller to describe seaboard spi. Signed-off-by: Allen Martin <amartin@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/tegra_spi.c45
1 files changed, 43 insertions, 2 deletions
diff --git a/drivers/spi/tegra_spi.c b/drivers/spi/tegra_spi.c
index 9bb34e2..ce19095 100644
--- a/drivers/spi/tegra_spi.c
+++ b/drivers/spi/tegra_spi.c
@@ -32,6 +32,9 @@
#include <asm/arch-tegra/clk_rst.h>
#include <asm/arch-tegra/tegra_spi.h>
#include <spi.h>
+#include <fdtdec.h>
+
+DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_SPI_CORRUPTS_UART)
#define corrupt_delay() udelay(CONFIG_SPI_CORRUPTS_UART_DLY);
@@ -44,6 +47,7 @@ struct tegra_spi_slave {
struct spi_tegra *regs;
unsigned int freq;
unsigned int mode;
+ int periph_id;
};
static inline struct tegra_spi_slave *to_tegra_spi(struct spi_slave *slave)
@@ -84,8 +88,45 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
}
spi->slave.bus = bus;
spi->slave.cs = cs;
- spi->freq = max_hz;
+#ifdef CONFIG_OF_CONTROL
+ int node = fdtdec_next_compatible(gd->fdt_blob, 0,
+ COMPAT_NVIDIA_TEGRA20_SFLASH);
+ if (node < 0) {
+ debug("%s: cannot locate sflash node\n", __func__);
+ return NULL;
+ }
+ if (!fdtdec_get_is_enabled(gd->fdt_blob, node)) {
+ debug("%s: sflash is disabled\n", __func__);
+ return NULL;
+ }
+ spi->regs = (struct spi_tegra *)fdtdec_get_addr(gd->fdt_blob,
+ node, "reg");
+ if ((fdt_addr_t)spi->regs == FDT_ADDR_T_NONE) {
+ debug("%s: no sflash register found\n", __func__);
+ return NULL;
+ }
+ spi->freq = fdtdec_get_int(gd->fdt_blob, node, "spi-max-frequency", 0);
+ if (!spi->freq) {
+ debug("%s: no sflash max frequency found\n", __func__);
+ return NULL;
+ }
+ spi->periph_id = clock_decode_periph_id(gd->fdt_blob, node);
+ if (spi->periph_id == PERIPH_ID_NONE) {
+ debug("%s: could not decode periph id\n", __func__);
+ return NULL;
+ }
+#else
spi->regs = (struct spi_tegra *)NV_PA_SPI_BASE;
+ spi->freq = TEGRA_SPI_MAX_FREQ;
+ spi->periph_id = PERIPH_ID_SPI1;
+#endif
+ if (max_hz < spi->freq) {
+ debug("%s: limiting frequency from %u to %u\n", __func__,
+ spi->freq, max_hz);
+ spi->freq = max_hz;
+ }
+ debug("%s: controller initialized at %p, freq = %u, periph_id = %d\n",
+ __func__, spi->regs, spi->freq, spi->periph_id);
spi->mode = mode;
return &spi->slave;
@@ -110,7 +151,7 @@ int spi_claim_bus(struct spi_slave *slave)
u32 reg;
/* Change SPI clock to correct frequency, PLLP_OUT0 source */
- clock_start_periph_pll(PERIPH_ID_SPI1, CLOCK_ID_PERIPH, spi->freq);
+ clock_start_periph_pll(spi->periph_id, CLOCK_ID_PERIPH, spi->freq);
/* Clear stale status here */
reg = SPI_STAT_RDY | SPI_STAT_RXF_FLUSH | SPI_STAT_TXF_FLUSH | \