Since the vast majority of GPIO I2C implementations behave the same way,
support the common GPIO framework with default settings.
This adds two new defines CONFIG_SOFT_I2C_GPIO_{SCL,SDA} so that boards
which want GPIO I2C support need only define these.
Signed-off-by: Mike Frysinger <vap...@gentoo.org>
---
README | 10 ++++++++++
drivers/i2c/soft_i2c.c | 42 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 52 insertions(+), 0 deletions(-)
diff --git a/README b/README
index a9c98f2..c9fb284 100644
--- a/README
+++ b/README
@@ -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..847db76 100644
--- a/drivers/i2c/soft_i2c.c
+++ b/drivers/i2c/soft_i2c.c
@@ -51,6 +51,48 @@
#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_direction_output(CONFIG_SOFT_I2C_GPIO_SCL, 0); \
+ gpio_request(CONFIG_SOFT_I2C_GPIO_SDA, "soft_i2c"); \
+ } while (0)
+# endif
+
+# ifndef I2C_ACTIVE
+# define I2C_ACTIVE gpio_direction_output(CONFIG_SOFT_I2C_GPIO_SDA, 0)
+# endif
+
+# ifndef I2C_TRISTATE
+# define I2C_TRISTATE gpio_direction_input(CONFIG_SOFT_I2C_GPIO_SDA)
+# endif
+
+# ifndef I2C_READ
+# define I2C_READ (gpio_get_value(CONFIG_SOFT_I2C_GPIO_SDA) != 0)
+# endif
+
+# ifndef I2C_SDA
+# define I2C_SDA(bit) gpio_set_value(CONFIG_SOFT_I2C_GPIO_SDA, bit)
+# endif
+
+# ifndef I2C_SCL
+# define I2C_SCL(bit) gpio_set_value(CONFIG_SOFT_I2C_GPIO_SCL, bit)
+# endif
+
+# ifndef I2C_DELAY
+# define I2C_DELAY udelay(5) /* 1/4 I2C clock duration */
+# endif
+
+#endif
+
/* #define DEBUG_I2C */
#ifdef DEBUG_I2C
--
1.7.1.1
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