Support for multiple soft I2C buses at soft_i2c.c
This approach defines get_multi_{sda|scl}_pin functions to switch between multiple "soft" I2C buses.
Up to CONFIG_SYS_MAX_I2C_BUS devices can be utilized. Common definition of I2C_X I2C buses is provided.
TEST HW: Samsung's Exynos4210 evt.0.1 - Trats development board
Signed-off-by: Lukasz Majewski l.majewski@samsung.com Signed-off-by: Kyungmin Park kyungmin.park@samsung.com --- drivers/i2c/soft_i2c.c | 41 +++++++++++++++++++++++++++++++++++++++++ include/i2c.h | 17 +++++++++++++++++ 2 files changed, 58 insertions(+), 0 deletions(-)
diff --git a/drivers/i2c/soft_i2c.c b/drivers/i2c/soft_i2c.c index 36c6114..7901f04 100644 --- a/drivers/i2c/soft_i2c.c +++ b/drivers/i2c/soft_i2c.c @@ -127,6 +127,15 @@ DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_I2C_MULTI_BUS) static unsigned int i2c_bus_num __attribute__ ((section (".data"))) = 0; +const char *soft_i2c_name[CONFIG_SYS_MAX_I2C_BUS] = { + NULL, + NULL, + NULL, + NULL, + "soft_i2c_4", + "soft_i2c_5", + NULL, +}; #endif /* CONFIG_I2C_MULTI_BUS */
/*----------------------------------------------------------------------- @@ -482,3 +491,35 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) send_stop(); return(failures); } + +#if defined(CONFIG_I2C_MULTI_BUS) +/* Handle multiple I2C buses instances */ +int get_multi_scl_pin(void) +{ + switch (I2C_GET_BUS()) { + case I2C_4: + return CONFIG_SOFT_I2C_I2C4_SCL; + case I2C_5: + return CONFIG_SOFT_I2C_I2C5_SCL; + }; + + return 0; +} + +int get_multi_sda_pin(void) +{ + switch (I2C_GET_BUS()) { + case I2C_4: + return CONFIG_SOFT_I2C_I2C4_SDA; + case I2C_5: + return CONFIG_SOFT_I2C_I2C5_SDA; + }; + + return 0; +} + +int multi_i2c_init(void) +{ + return 0; +} +#endif /* CONFIG_I2C_MULTI_BUS */ diff --git a/include/i2c.h b/include/i2c.h index 1f35acf..d563d62 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -250,4 +250,21 @@ static inline void I2C_SET_BUS(unsigned int bus) i2c_set_bus_num(bus); }
+/* Multi I2C busses handling */ +#if (defined(CONFIG_SOFT_I2C) && defined(CONFIG_I2C_MULTI_BUS)) +enum { + I2C_0, + I2C_1, + I2C_2, + I2C_3, + I2C_4, + I2C_5, + I2C_6 +}; + +extern const char *soft_i2c_name[CONFIG_SYS_MAX_I2C_BUS]; +extern int get_multi_scl_pin(void); +extern int get_multi_sda_pin(void); +extern int multi_i2c_init(void); +#endif #endif /* _I2C_H_ */