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 --- arch/arm/dts/tegra20.dtsi | 13 +++++++++++++ drivers/spi/tegra_spi.c | 42 +++++++++++++++++++++++++++++++++++++++++- include/fdtdec.h | 1 + lib/fdtdec.c | 1 + 4 files changed, 56 insertions(+), 1 deletion(-)
diff --git a/arch/arm/dts/tegra20.dtsi b/arch/arm/dts/tegra20.dtsi index 707975c..8d4c7ec 100644 --- a/arch/arm/dts/tegra20.dtsi +++ b/arch/arm/dts/tegra20.dtsi @@ -337,4 +337,17 @@ }; };
+ spi@7000c380 { + compatible = "nvidia,tegra20-sflash"; + reg = <0x7000c380 0x80>; + interrupts = <0 39 0x04>; + nvidia,dma-request-selector = <&apbdma 11>; + spi-max-frequency = <25000000>; + #address-cells = <1>; + #size-cells = <0>; + status = "disabled"; + /* PERIPH_ID_SPI1, PLLP_OUT0 */ + clocks = <&tegra_car 43>; + }; + }; diff --git a/drivers/spi/tegra_spi.c b/drivers/spi/tegra_spi.c index 9bb34e2..36b0cd0 100644 --- a/drivers/spi/tegra_spi.c +++ b/drivers/spi/tegra_spi.c @@ -32,6 +32,11 @@ #include <asm/arch-tegra/clk_rst.h> #include <asm/arch-tegra/tegra_spi.h> #include <spi.h> +#ifdef CONFIG_OF_CONTROL +#include <fdtdec.h> +#endif + +DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_SPI_CORRUPTS_UART) #define corrupt_delay() udelay(CONFIG_SPI_CORRUPTS_UART_DLY); @@ -44,6 +49,7 @@ 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) @@ -85,7 +91,41 @@ 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; + } + 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 +150,7 @@ 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 | \ diff --git a/include/fdtdec.h b/include/fdtdec.h index 70d0e97..1504336 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -70,6 +70,7 @@ enum fdt_compat_id { COMPAT_NVIDIA_TEGRA20_NAND, /* Tegra2 NAND controller */ COMPAT_NVIDIA_TEGRA20_PWM, /* Tegra 2 PWM controller */ COMPAT_NVIDIA_TEGRA20_DC, /* Tegra 2 Display controller */ + COMPAT_NVIDIA_TEGRA20_SFLASH, /* Tegra 2 SPI flash controller */
COMPAT_COUNT, }; diff --git a/lib/fdtdec.c b/lib/fdtdec.c index 6dba438..6779278 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -45,6 +45,7 @@ static const char * const compat_names[COMPAT_COUNT] = { COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"), COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"), COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"), + COMPAT(NVIDIA_TEGRA20_SFLASH, "nvidia,tegra20-sflash"), };
const char *fdtdec_get_compatible(enum fdt_compat_id id)