This patch implements software SPI for the universal C210 board.
Signed-off-by: Piotr Wilczek p.wilczek@samsung.com Signed-off-by: Kyungmin Park kyungmin.park@samsung.com CC: Minkyu Kang mk7.kang@samsung.com CC: Wolfgang Denk wd@denx.de CC: Jean-Christophe PLAGNIOL-VILLARD plagnioj@jcrosoft.com --- Changes in v2: - removed space between # and include; - changed return in spi_cs_is_valid function;
board/samsung/universal_c210/universal.c | 35 ++++++++++++++++++++++++++++++ drivers/spi/soft_spi.c | 7 +++++- include/configs/s5pc210_universal.h | 19 ++++++++++++++++ 3 files changed, 60 insertions(+), 1 deletions(-)
diff --git a/board/samsung/universal_c210/universal.c b/board/samsung/universal_c210/universal.c index ded97ca..6947e83 100644 --- a/board/samsung/universal_c210/universal.c +++ b/board/samsung/universal_c210/universal.c @@ -24,6 +24,7 @@
#include <common.h> #include <asm/io.h> +#include <spi.h> #include <asm/arch/adc.h> #include <asm/arch/gpio.h> #include <asm/arch/mmc.h> @@ -33,6 +34,9 @@ #include <asm/arch/cpu.h> #include <max8998_pmic.h> #include <asm/arch/watchdog.h> +#if defined(CONFIG_SOFT_SPI) +# include <asm/gpio.h> +#endif
DECLARE_GLOBAL_DATA_PTR;
@@ -284,3 +288,34 @@ int board_early_init_f(void)
return 0; } + +void soft_spi_init() +{ + gpio_direction_output(CONFIG_SOFT_SPI_GPIO_SCLK, + CONFIG_SOFT_SPI_MODE & SPI_CPOL); + gpio_direction_output(CONFIG_SOFT_SPI_GPIO_MOSI, 1); + gpio_direction_input(CONFIG_SOFT_SPI_GPIO_MISO); + gpio_direction_output(CONFIG_SOFT_SPI_GPIO_CS, + !(CONFIG_SOFT_SPI_MODE & SPI_CS_HIGH)); +} + +void spi_cs_activate(struct spi_slave *slave) +{ + gpio_set_value(CONFIG_SOFT_SPI_GPIO_CS, + !(CONFIG_SOFT_SPI_MODE & SPI_CS_HIGH)); + SPI_SCL(1); + gpio_set_value(CONFIG_SOFT_SPI_GPIO_CS, + CONFIG_SOFT_SPI_MODE & SPI_CS_HIGH); +} + +void spi_cs_deactivate(struct spi_slave *slave) +{ + gpio_set_value(CONFIG_SOFT_SPI_GPIO_CS, + !(CONFIG_SOFT_SPI_MODE & SPI_CS_HIGH)); +} + +int spi_cs_is_valid(unsigned int bus, unsigned int cs) +{ + return bus == 0 && cs == 0; +} + diff --git a/drivers/spi/soft_spi.c b/drivers/spi/soft_spi.c index 13df8cb..a0a3012 100644 --- a/drivers/spi/soft_spi.c +++ b/drivers/spi/soft_spi.c @@ -29,6 +29,10 @@
#include <malloc.h>
+#if defined(CONFIG_SOFT_SPI) +# include <asm/gpio.h> +#endif + /*----------------------------------------------------------------------- * Definitions */ @@ -59,8 +63,9 @@ static inline struct soft_spi_slave *to_soft_spi(struct spi_slave *slave) void spi_init (void) { #ifdef SPI_INIT +#ifdef CONFIG_SYS_IMMR volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR; - +#endif SPI_INIT; #endif } diff --git a/include/configs/s5pc210_universal.h b/include/configs/s5pc210_universal.h index 46f2663..f7a7443 100644 --- a/include/configs/s5pc210_universal.h +++ b/include/configs/s5pc210_universal.h @@ -264,4 +264,23 @@ #define CONFIG_USB_GADGET_S3C_UDC_OTG #define CONFIG_USB_GADGET_DUALSPEED
+/* + * SPI Settings + */ +#define CONFIG_SOFT_SPI +#define CONFIG_SOFT_SPI_MODE SPI_MODE_3 +#define CONFIG_SOFT_SPI_GPIO_SCLK exynos4_gpio_part2_get_nr(y3, 1) +#define CONFIG_SOFT_SPI_GPIO_MOSI exynos4_gpio_part2_get_nr(y3, 3) +#define CONFIG_SOFT_SPI_GPIO_MISO exynos4_gpio_part2_get_nr(y3, 0) +#define CONFIG_SOFT_SPI_GPIO_CS exynos4_gpio_part2_get_nr(y4, 3) + +#define SPI_DELAY udelay(1) +#define SPI_INIT soft_spi_init() +#define SPI_SCL(bit) gpio_set_value(CONFIG_SOFT_SPI_GPIO_SCLK, bit) +#define SPI_SDA(bit) gpio_set_value(CONFIG_SOFT_SPI_GPIO_MOSI, bit) +#define SPI_READ gpio_get_value(CONFIG_SOFT_SPI_GPIO_MISO) +#ifndef __ASSEMBLY__ +void soft_spi_init(void); +#endif + #endif /* __CONFIG_H */