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 --- board/keymile/common/common.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'board/keymile') diff --git a/board/keymile/common/common.c b/board/keymile/common/common.c index 259462360c..ec27bdae22 100644 --- a/board/keymile/common/common.c +++ b/board/keymile/common/common.c @@ -424,6 +424,7 @@ static int get_scl (void) #endif +#if !defined(CONFIG_KMETER1) static void writeStartSeq (void) { set_sda (1); @@ -474,6 +475,7 @@ static int i2c_make_abort (void) get_sda (); return ret; } +#endif /** * i2c_init_board - reset i2c bus. When the board is powercycled during a @@ -481,6 +483,23 @@ static int i2c_make_abort (void) */ void i2c_init_board(void) { +#if defined(CONFIG_KMETER1) + struct fsl_i2c *dev; + dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET); + uchar dummy; + + out_8 (&dev->cr, (I2C_CR_MSTA)); + out_8 (&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA)); + dummy = in_8(&dev->dr); + dummy = in_8(&dev->dr); + if (dummy != 0xff) { + dummy = in_8(&dev->dr); + } + out_8 (&dev->cr, (I2C_CR_MEN)); + out_8 (&dev->cr, 0x00); + out_8 (&dev->cr, (I2C_CR_MEN)); + +#else #if defined(CONFIG_HARD_I2C) volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR ; volatile i2c8260_t *i2c = (i2c8260_t *)&immap->im_i2c; @@ -500,6 +519,7 @@ void i2c_init_board(void) /* Set the PortPins back to use for I2C */ setports (0); #endif +#endif } #endif #endif -- cgit