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| author | Heiko Schocher <hs@denx.de> | 2008-10-15 09:38:38 +0200 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2008-10-18 21:54:02 +0200 |
| commit | 4ca107effebfbabac1057c39632105dacef95957 (patch) | |
| tree | 0eafe32f9850092895c6c556e4c7b3ff10c87bc6 /drivers/i2c | |
| parent | e5e4edd9f1f76210a09c34ee835f6cff60fdbbd1 (diff) | |
| download | u-boot-imx-4ca107effebfbabac1057c39632105dacef95957.zip u-boot-imx-4ca107effebfbabac1057c39632105dacef95957.tar.gz u-boot-imx-4ca107effebfbabac1057c39632105dacef95957.tar.bz2 | |
soft_i2c: Add CFG_I2C_INIT_BOARD option
This patch adds the option for a boardspecific
I2C deblocking mechanism for the soft i2c driver.
Signed-off-by: Heiko Schocher <hs@denx.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | 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 } /*----------------------------------------------------------------------- |