This patch adds support for software I2C for GONI reference target. It adds support for access to GPIOs by number, not as it is present, by bank and offset.
Signed-off-by: Lukasz Majewski l.majewski@samsung.com Signed-off-by: Kyungmin Park kyungmin.park@samsung.com Cc: Minkyu Kang mk7.kang@samsung.com Cc: Heiko Schocher hs@denx.de
--- Changes for v2: - Generic GPIO code added to arch/arm/gpio.h - Platform dependent GPIO code added to board/samsung/goni.c - Code cleanup --- arch/arm/include/asm/arch-s5pc1xx/gpio.h | 36 ++++++++++++++++++++++++++++++ board/samsung/goni/goni.c | 30 +++++++++++++++++++++++- include/configs/s5p_goni.h | 13 ++++++++++ 3 files changed, 77 insertions(+), 2 deletions(-)
diff --git a/arch/arm/include/asm/arch-s5pc1xx/gpio.h b/arch/arm/include/asm/arch-s5pc1xx/gpio.h index 903de9c..8d2e2e9 100644 --- a/arch/arm/include/asm/arch-s5pc1xx/gpio.h +++ b/arch/arm/include/asm/arch-s5pc1xx/gpio.h @@ -134,6 +134,40 @@ unsigned int s5p_gpio_get_value(struct s5p_gpio_bank *bank, int gpio); void s5p_gpio_set_pull(struct s5p_gpio_bank *bank, int gpio, int mode); void s5p_gpio_set_drv(struct s5p_gpio_bank *bank, int gpio, int mode); void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode); +struct s5p_gpio_bank *s5p_gpio_get_bank(int nr); +int s5p_gpio_get_pin(int nr); + +static inline int gpio_request(int gpio, const char *label) +{ + return 0; +} + +static inline int gpio_direction_input(int nr) +{ + s5p_gpio_direction_input(s5p_gpio_get_bank(nr), + s5p_gpio_get_pin(nr)); + return 0; +} + +static inline int gpio_direction_output(int nr, int value) +{ + s5p_gpio_direction_output(s5p_gpio_get_bank(nr), + s5p_gpio_get_pin(nr), value); + return 0; +} + +static inline int gpio_get_value(int nr) +{ + return (int) s5p_gpio_get_value(s5p_gpio_get_bank(nr), + s5p_gpio_get_pin(nr)); +} + +static inline void gpio_set_value(int nr, int value) +{ + s5p_gpio_set_value(s5p_gpio_get_bank(nr), + s5p_gpio_get_pin(nr), value); +} + #endif
/* Pin configurations */ @@ -155,4 +189,6 @@ void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode); #define GPIO_DRV_FAST 0x0 #define GPIO_DRV_SLOW 0x1
+/* GPIO pins per bank */ +#define GPIO_PER_BANK 8 #endif diff --git a/board/samsung/goni/goni.c b/board/samsung/goni/goni.c index e24cd29..d1ff956 100644 --- a/board/samsung/goni/goni.c +++ b/board/samsung/goni/goni.c @@ -1,7 +1,8 @@ /* - * Copyright (C) 2008-2009 Samsung Electronics + * Copyright (C) 2008-2011 Samsung Electronics * Minkyu Kang mk7.kang@samsung.com * Kyungmin Park kyungmin.park@samsung.com + * Lukasz Majewski l.majewski@samsung.com * * See file CREDITS for list of people who contributed to this * project. @@ -28,7 +29,7 @@
DECLARE_GLOBAL_DATA_PTR;
-static struct s5pc110_gpio *s5pc110_gpio; +struct s5pc110_gpio *s5pc110_gpio;
int board_init(void) { @@ -96,3 +97,28 @@ int board_mmc_init(bd_t *bis) return s5p_mmc_init(0, 4); } #endif + +#ifdef CONFIG_SOFT_I2C +void i2c_init_board(void) {} +/* Platform dependent functions for extracting GPIO number */ +int s5p_gpio_get_nr(void *gp_ptr, int gpio) +{ + unsigned int offset = gp_ptr - (void *) s5pc110_gpio; + offset /= sizeof(struct s5p_gpio_bank); + + return (offset * GPIO_PER_BANK) + gpio; +} + +struct s5p_gpio_bank *s5p_gpio_get_bank(int nr) +{ + int bank = nr / GPIO_PER_BANK; + bank *= sizeof(struct s5p_gpio_bank); + + return (struct s5p_gpio_bank *) ((void *) s5pc110_gpio + bank); +} + +int s5p_gpio_get_pin(int nr) +{ + return nr % GPIO_PER_BANK; +} +#endif diff --git a/include/configs/s5p_goni.h b/include/configs/s5p_goni.h index 010428b..7af1b5f 100644 --- a/include/configs/s5p_goni.h +++ b/include/configs/s5p_goni.h @@ -224,4 +224,17 @@
#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_LOAD_ADDR - 0x1000000)
+#include <asm/arch/gpio.h> +/* + * I2C Settings + */ +#define S5PC110_GPIO_J3 (S5PC110_GPIO_BASE + 0x2C0) +#define CONFIG_SOFT_I2C_GPIO_SCL s5p_gpio_get_nr(S5PC110_GPIO_J3, 3) +#define CONFIG_SOFT_I2C_GPIO_SDA s5p_gpio_get_nr(S5PC110_GPIO_J3, 0) + +#define CONFIG_SOFT_I2C 1 +#define CONFIG_SYS_I2C_SPEED 50000 +#define CONFIG_I2C_MULTI_BUS +#define CONFIG_SYS_MAX_I2C_BUS 7 + #endif /* __CONFIG_H */