Currently davinci spi driver supports only bus 0 cs 0. This patch allows driver to support bus 1 and bus 2 with configurable number of chip selects. Also defaults are selected in a way to avoid regression on other platforms that uses davinci spi driver and has only one spi bus.
Signed-off-by: Rex Chang rchang@ti.com Signed-off-by: Murali Karicheri m-karicheri2@ti.com Acked-by: Tom Rini trini@ti.com --- drivers/spi/davinci_spi.c | 60 ++++++++++++++++++++++++++++++++++++++++++--- drivers/spi/davinci_spi.h | 33 +++++++++++++++++++++++++ 2 files changed, 90 insertions(+), 3 deletions(-)
diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c index e3fb321..b682bc4 100644 --- a/drivers/spi/davinci_spi.c +++ b/drivers/spi/davinci_spi.c @@ -32,7 +32,27 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, if (!ds) return NULL;
- ds->regs = (struct davinci_spi_regs *)CONFIG_SYS_SPI_BASE; + ds->slave.bus = bus; + ds->slave.cs = cs; + + switch (bus) { + case SPI0_BUS: + ds->regs = (struct davinci_spi_regs *)SPI0_BASE; + break; +#ifdef CONFIG_SYS_SPI1 + case SPI1_BUS: + ds->regs = (struct davinci_spi_regs *)SPI0_BASE; + break; +#endif +#ifdef CONFIG_SYS_SPI2 + case SPI2_BUS: + ds->regs = (struct davinci_spi_regs *)SPI2_BASE; + break; +#endif + default: /* Invalid bus number */ + return NULL; + } + ds->freq = max_hz;
return &ds->slave; @@ -59,7 +79,7 @@ int spi_claim_bus(struct spi_slave *slave) writel(SPIGCR1_MASTER_MASK | SPIGCR1_CLKMOD_MASK, &ds->regs->gcr1);
/* CS, CLK, SIMO and SOMI are functional pins */ - writel((SPIPC0_EN0FUN_MASK | SPIPC0_CLKFUN_MASK | + writel(((1 << slave->cs) | SPIPC0_CLKFUN_MASK | SPIPC0_DOFUN_MASK | SPIPC0_DIFUN_MASK), &ds->regs->pc0);
/* setup format */ @@ -262,9 +282,43 @@ out: return 0; }
+#ifdef CONFIG_SYS_SPI1 +static int bus1_cs_valid(unsigned int bus, unsigned int cs) +{ + if ((bus == SPI1_BUS) && (cs < SPI1_NUM_CS)) + return 1; + return 0; +} +#else +static int bus1_cs_valid(unsigned int bus, unsigned int cs) +{ + return 0; +} +#endif + +#ifdef CONFIG_SYS_SPI2 +static int bus2_cs_valid(unsigned int bus, unsigned int cs) +{ + if ((bus == SPI2_BUS) && (cs < SPI2_NUM_CS)) + return 1; + return 0; +} +#else +static int bus2_cs_valid(unsigned int bus, unsigned int cs) +{ + return 0; +} +#endif + int spi_cs_is_valid(unsigned int bus, unsigned int cs) { - return bus == 0 && cs == 0; + if ((bus == SPI0_BUS) && (cs < SPI0_NUM_CS)) + return 1; + else if (bus1_cs_valid(bus, cs)) + return 1; + else if (bus2_cs_valid(bus, cs)) + return 1; + return 0; }
void spi_cs_activate(struct spi_slave *slave) diff --git a/drivers/spi/davinci_spi.h b/drivers/spi/davinci_spi.h index 33f69b5..d4612d3 100644 --- a/drivers/spi/davinci_spi.h +++ b/drivers/spi/davinci_spi.h @@ -74,6 +74,39 @@ struct davinci_spi_regs { /* SPIDEF */ #define SPIDEF_CSDEF0_MASK BIT(0)
+#define SPI0_BUS 0 +#define SPI0_BASE CONFIG_SYS_SPI_BASE +/* + * Define default SPI0_NUM_CS as 1 for existing platforms that uses this + * driver. Platform can configure number of CS using CONFIG_SYS_SPI0_NUM_CS + * if more than one CS is supported and by defining CONFIG_SYS_SPI0. + */ +#ifndef CONFIG_SYS_SPI0 +#define SPI0_NUM_CS 1 +#else +#define SPI0_NUM_CS CONFIG_SYS_SPI0_NUM_CS +#endif + +/* + * define CONFIG_SYS_SPI1 when platform has spi-1 device (bus #1) and + * CONFIG_SYS_SPI1_NUM_CS defines number of CS on this bus + */ +#ifdef CONFIG_SYS_SPI1 +#define SPI1_BUS 1 +#define SPI1_NUM_CS CONFIG_SYS_SPI1_NUM_CS +#define SPI1_BASE CONFIG_SYS_SPI1_BASE +#endif + +/* + * define CONFIG_SYS_SPI2 when platform has spi-2 device (bus #2) and + * CONFIG_SYS_SPI2_NUM_CS defines number of CS on this bus + */ +#ifdef CONFIG_SYS_SPI2 +#define SPI2_BUS 2 +#define SPI2_NUM_CS CONFIG_SYS_SPI2_NUM_CS +#define SPI2_BASE CONFIG_SYS_SPI2_BASE +#endif + struct davinci_spi_slave { struct spi_slave slave; struct davinci_spi_regs *regs;