From 39df00d9aecfb465b9eec9af593f9b763fb5209a Mon Sep 17 00:00:00 2001 From: Heiko Schocher Date: Thu, 9 Jul 2009 12:04:26 +0200 Subject: i2c, mpc83xx: add CONFIG_SYS_I2C_INIT_BOARD for fsl_i2c This patch adds the possibility to call a board specific i2c bus reset routine for the fsl_i2c bus driver, and adds this option for the keymile kmeter1 board. The deblock sequence for this board is implemented and tested in the following way: CR = 0x20 (release SDA and SCL pin) CR = 0xa0 (start read) dummy read dummy read if 2. dummy read == 0x00 3. dummy read CR = 0x80 (SDA and SCL now 1 SR = 0x86) CR = 0x00 (Modul reset SR=0x81) CR = 0x80 (SDA and SCL = 1, SR = 0x81) Signed-off-by: Heiko Schocher --- drivers/i2c/fsl_i2c.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/i2c/fsl_i2c.c') diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c index 6ab7d3d..ce0f301 100644 --- a/drivers/i2c/fsl_i2c.c +++ b/drivers/i2c/fsl_i2c.c @@ -178,6 +178,12 @@ i2c_init(int speed, int slaveadd) struct fsl_i2c *dev; unsigned int temp; +#ifdef CONFIG_SYS_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(); +#endif dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET); writeb(0, &dev->cr); /* stop I2C controller */ -- cgit v1.1