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.majew...@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
Cc: Minkyu Kang <mk7.k...@samsung.com>
Cc: Heiko Schocher <h...@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
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 <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_SYS_I2C_INIT_BOARD
+#define CONFIG_I2C_MULTI_BUS
+#define CONFIG_SYS_MAX_I2C_BUS 7
+
#endif /* __CONFIG_H */
--
1.7.2.3
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