From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lukasz Majewski Date: Wed, 10 Aug 2011 11:21:35 +0200 Subject: [U-Boot] [PATCH v3] i2c:gpio:s5p: I2C GPIO Software implementation (via soft_i2c) In-Reply-To: <1310372331-26637-1-git-send-email-l.majewski@samsung.com> References: <1310372331-26637-1-git-send-email-l.majewski@samsung.com> Message-ID: <1312968095-13873-1-git-send-email-l.majewski@samsung.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 Signed-off-by: Kyungmin Park Cc: Minkyu Kang Cc: Heiko Schocher --- Changes for v2: - Generic GPIO code added to arch/arm/gpio.h - Platform dependent GPIO code added to board/samsung/goni.c - Code cleanup Changes for v3: - I2C GPIO common code added to drivers/gpio/s5p_gpio.c - i2c_init_board() function added(required by soft_i2c) --- arch/arm/include/asm/arch-s5pc1xx/gpio.h | 38 ++++++++++++++++++++++++++++++ board/samsung/goni/goni.c | 16 ++++++++---- drivers/gpio/s5p_gpio.c | 24 +++++++++++++++++++ include/configs/s5p_goni.h | 14 +++++++++++ 4 files changed, 86 insertions(+), 6 deletions(-) diff --git a/arch/arm/include/asm/arch-s5pc1xx/gpio.h b/arch/arm/include/asm/arch-s5pc1xx/gpio.h index 903de9c..619ba6f 100644 --- a/arch/arm/include/asm/arch-s5pc1xx/gpio.h +++ b/arch/arm/include/asm/arch-s5pc1xx/gpio.h @@ -134,6 +134,41 @@ 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); +} + +extern struct s5pc110_gpio *s5p_gpio; #endif /* Pin configurations */ @@ -155,4 +190,7 @@ 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..354f5ad 100644 --- a/board/samsung/goni/goni.c +++ b/board/samsung/goni/goni.c @@ -28,12 +28,12 @@ DECLARE_GLOBAL_DATA_PTR; -static struct s5pc110_gpio *s5pc110_gpio; +struct s5pc110_gpio *s5p_gpio; int board_init(void) { /* Set Initial global variables */ - s5pc110_gpio = (struct s5pc110_gpio *)S5PC110_GPIO_BASE; + s5p_gpio = (struct s5pc110_gpio *)S5PC110_GPIO_BASE; gd->bd->bi_arch_number = MACH_TYPE_GONI; gd->bd->bi_boot_params = PHYS_SDRAM_1 + 0x100; @@ -67,13 +67,17 @@ int checkboard(void) } #endif +#ifdef CONFIG_SOFT_I2C +void i2c_init_board(void) {} +#endif + #ifdef CONFIG_GENERIC_MMC int board_mmc_init(bd_t *bis) { int i; /* MASSMEMORY_EN: XMSMDATA7: GPJ2[7] output high */ - s5p_gpio_direction_output(&s5pc110_gpio->j2, 7, 1); + s5p_gpio_direction_output(&s5p_gpio->j2, 7, 1); /* * MMC0 GPIO @@ -86,11 +90,11 @@ int board_mmc_init(bd_t *bis) if (i == 2) continue; /* GPG0[0:6] special function 2 */ - s5p_gpio_cfg_pin(&s5pc110_gpio->g0, i, 0x2); + s5p_gpio_cfg_pin(&s5p_gpio->g0, i, 0x2); /* GPG0[0:6] pull disable */ - s5p_gpio_set_pull(&s5pc110_gpio->g0, i, GPIO_PULL_NONE); + s5p_gpio_set_pull(&s5p_gpio->g0, i, GPIO_PULL_NONE); /* GPG0[0:6] drv 4x */ - s5p_gpio_set_drv(&s5pc110_gpio->g0, i, GPIO_DRV_4X); + s5p_gpio_set_drv(&s5p_gpio->g0, i, GPIO_DRV_4X); } return s5p_mmc_init(0, 4); diff --git a/drivers/gpio/s5p_gpio.c b/drivers/gpio/s5p_gpio.c index 2043859..e247b6f 100644 --- a/drivers/gpio/s5p_gpio.c +++ b/drivers/gpio/s5p_gpio.c @@ -141,3 +141,27 @@ void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode) writel(value, &bank->drv); } + +#ifdef CONFIG_SOFT_I2C +/* Platform dependent functions for extracting GPIO number */ +int s5p_gpio_get_nr(void *gp_ptr, int gpio) +{ + unsigned int offset = gp_ptr - (void *) s5p_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 *) s5p_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 381bb39..620dca7 100644 --- a/include/configs/s5p_goni.h +++ b/include/configs/s5p_goni.h @@ -223,4 +223,18 @@ #define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_LOAD_ADDR - 0x1000000) +#include +/* + * 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_SYS_I2C_INIT_BOARD +#define CONFIG_I2C_MULTI_BUS +#define CONFIG_SYS_MAX_I2C_BUS 7 + #endif /* __CONFIG_H */ -- 1.7.2.3