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| author | Richard Retanubun <RichardRetanubun@RuggedCom.com> | 2010-04-12 15:08:17 -0400 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2010-04-19 07:46:35 +0200 |
| commit | 26a33504a55e4882520f2e9da96ba6c22badb353 (patch) | |
| tree | 42000dcd08814c5b5dbbe9438297e22506daa0e4 | |
| parent | 2a72e9ed18d2164eb7fe569119342eb631b568da (diff) | |
| download | u-boot-imx-26a33504a55e4882520f2e9da96ba6c22badb353.zip u-boot-imx-26a33504a55e4882520f2e9da96ba6c22badb353.tar.gz u-boot-imx-26a33504a55e4882520f2e9da96ba6c22badb353.tar.bz2 | |
fsl_i2c: Added a callpoint for i2c_board_late_init
This patch adds a callpoint in i2c_init that allows board specific
i2c board initialization (typically for i2c bus reset) that is called
after i2c_init operations, allowing the i2c_board_late_init function
to use the pre-configured i2c bus speed and slave address.
| -rw-r--r-- | README | 11 | ||||
| -rw-r--r-- | drivers/i2c/fsl_i2c.c | 16 | ||||
| -rw-r--r-- | include/i2c.h | 3 |
3 files changed, 27 insertions, 3 deletions
@@ -1509,6 +1509,17 @@ The following options need to be configured: custom i2c_init_board() routine in boards/xxx/board.c is run early in the boot sequence. + CONFIG_SYS_I2C_BOARD_LATE_INIT + + An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is + defined a custom i2c_board_late_init() routine in + boards/xxx/board.c is run AFTER the operations in i2c_init() + is completed. This callpoint can be used to unreset i2c bus + using CPU i2c controller register accesses for CPUs whose i2c + controller provide such a method. It is called at the end of + i2c_init() to allow i2c_init operations to setup the i2c bus + controller on the CPU (e.g. setting bus speed & slave address). + CONFIG_I2CFAST (PPC405GP|PPC405EP only) This option enables configuration of bi_iic_fast[] flags diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c index 2241990..cb13dee 100644 --- a/drivers/i2c/fsl_i2c.c +++ b/drivers/i2c/fsl_i2c.c @@ -221,9 +221,10 @@ i2c_init(int speed, int slaveadd) 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. */ + /* 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); @@ -249,6 +250,15 @@ i2c_init(int speed, int slaveadd) writeb(0x0, &dev->sr); /* clear status register */ writeb(I2C_CR_MEN, &dev->cr); /* start I2C controller */ #endif + +#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT + /* Call board specific i2c bus reset routine AFTER the bus has been + * initialized. Use either this callpoint or i2c_init_board; + * which is called before i2c_init operations. + * For details about this problem see doc/I2C_Edge_Conditions. + */ + i2c_board_late_init(); +#endif } static int diff --git a/include/i2c.h b/include/i2c.h index d828964..cd23c8a 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -111,6 +111,9 @@ void i2c_init(int speed, int slaveaddr); #ifdef CONFIG_SYS_I2C_INIT_BOARD void i2c_init_board(void); #endif +#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT +void i2c_board_late_init(void); +#endif #if defined(CONFIG_I2C_MUX) |