This patch adds the option for a boardspecific I2C deblocking mechanism for the soft i2c driver.
Signed-off-by: Heiko Schocher hs@denx.de --- drivers/i2c/soft_i2c.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/drivers/i2c/soft_i2c.c b/drivers/i2c/soft_i2c.c index 19c364b..63e6a7b 100644 --- a/drivers/i2c/soft_i2c.c +++ b/drivers/i2c/soft_i2c.c @@ -75,13 +75,16 @@ static unsigned int i2c_bus_num __attribute__ ((section ("data"))) = 0; /*----------------------------------------------------------------------- * Local functions */ +#if !defined(CFG_I2C_INIT_BOARD) static void send_reset (void); +#endif static void send_start (void); static void send_stop (void); static void send_ack (int); static int write_byte (uchar byte); static uchar read_byte (int);
+#if !defined(CFG_I2C_INIT_BOARD) /*----------------------------------------------------------------------- * Send a reset sequence consisting of 9 clocks with the data signal high * to clock any confused device back into an idle state. Also send a @@ -109,6 +112,7 @@ static void send_reset(void) send_stop(); I2C_TRISTATE; } +#endif
/*----------------------------------------------------------------------- * START: High -> Low on SDA while SCL is High @@ -280,6 +284,12 @@ static uchar read_byte(int ack) */ void i2c_init (int speed, int slaveaddr) { +#if defined(CFG_I2C_INIT_BOARD) + /* call board specific i2c bus reset routine before accessing the */ + /* environment, which might be in a chip on that bus. For details */ + /* about this problem see doc/I2C_Edge_Conditions. */ + i2c_init_board(); +#else /* * WARNING: Do NOT save speed in a static variable: if the * I2C routines are called before RAM is initialized (to read @@ -287,6 +297,7 @@ void i2c_init (int speed, int slaveaddr) * system will crash. */ send_reset (); +#endif }
/*-----------------------------------------------------------------------