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i2c, mpc83xx: add CONFIG_SYS_I2C_INIT_BOARD for fsl_i2c

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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 <hs@denx.de>
This commit is contained in:
Heiko Schocher
2009-07-09 12:04:26 +02:00
parent 1bc1538613
commit 39df00d9ae
3 changed files with 26 additions and 1 deletions
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6
drivers/i2c/fsl_i2c.c
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@ -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 */