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| author | Wolfgang Denk <wd@denx.de> | 2010-07-24 20:41:28 +0200 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2010-07-24 20:41:28 +0200 |
| commit | 4ae0c2dc99e339324a4b67c124525087cc3d0be7 (patch) | |
| tree | 3d85b2de1e33a9b3a6091962c1f5f1e5ccb4f8f3 | |
| parent | 96623171423a94092cde80642328fda58a92c894 (diff) | |
| parent | 793b5726f7e998c7cec93ea5ee7910dd6ddb1e5e (diff) | |
| download | u-boot-imx-4ae0c2dc99e339324a4b67c124525087cc3d0be7.zip u-boot-imx-4ae0c2dc99e339324a4b67c124525087cc3d0be7.tar.gz u-boot-imx-4ae0c2dc99e339324a4b67c124525087cc3d0be7.tar.bz2 | |
Merge branch 'master' of git://git.denx.de/u-boot-i2c
| -rw-r--r-- | README | 10 | ||||
| -rw-r--r-- | drivers/i2c/soft_i2c.c | 52 |
2 files changed, 62 insertions, 0 deletions
@@ -1495,6 +1495,16 @@ The following options need to be configured: #define I2C_DELAY udelay(2) + CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA + + If your arch supports the generic GPIO framework (asm/gpio.h), + then you may alternatively define the two GPIOs that are to be + used as SCL / SDA. Any of the previous I2C_xxx macros will + have GPIO-based defaults assigned to them as appropriate. + + You should define these to the GPIO value as given directly to + the generic GPIO functions. + CONFIG_SYS_I2C_INIT_BOARD When a board is reset during an i2c bus transfer diff --git a/drivers/i2c/soft_i2c.c b/drivers/i2c/soft_i2c.c index e0cf1e1..1a1809a 100644 --- a/drivers/i2c/soft_i2c.c +++ b/drivers/i2c/soft_i2c.c @@ -51,6 +51,58 @@ #endif #include <i2c.h> +#if defined(CONFIG_SOFT_I2C_GPIO_SCL) +# include <asm/gpio.h> + +# ifndef I2C_GPIO_SYNC +# define I2C_GPIO_SYNC +# endif + +# ifndef I2C_INIT +# define I2C_INIT \ + do { \ + gpio_request(CONFIG_SOFT_I2C_GPIO_SCL, "soft_i2c"); \ + gpio_request(CONFIG_SOFT_I2C_GPIO_SDA, "soft_i2c"); \ + } while (0) +# endif + +# ifndef I2C_ACTIVE +# define I2C_ACTIVE do { } while (0) +# endif + +# ifndef I2C_TRISTATE +# define I2C_TRISTATE do { } while (0) +# endif + +# ifndef I2C_READ +# define I2C_READ gpio_get_value(CONFIG_SOFT_I2C_GPIO_SDA) +# endif + +# ifndef I2C_SDA +# define I2C_SDA(bit) \ + do { \ + if (bit) \ + gpio_direction_input(CONFIG_SOFT_I2C_GPIO_SDA); \ + else \ + gpio_direction_output(CONFIG_SOFT_I2C_GPIO_SDA, 0); \ + I2C_GPIO_SYNC; \ + } while (0) +# endif + +# ifndef I2C_SCL +# define I2C_SCL(bit) \ + do { \ + gpio_direction_output(CONFIG_SOFT_I2C_GPIO_SCL, bit); \ + I2C_GPIO_SYNC; \ + } while (0) +# endif + +# ifndef I2C_DELAY +# define I2C_DELAY udelay(5) /* 1/4 I2C clock duration */ +# endif + +#endif + /* #define DEBUG_I2C */ #ifdef DEBUG_I2C |