diff options
| author | Heiko Schocher <hs@denx.de> | 2009-07-09 12:04:26 +0200 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2009-07-21 07:06:26 +0200 |
| commit | 39df00d9aecfb465b9eec9af593f9b763fb5209a (patch) | |
| tree | 65392eb84672e4f25379bf65a4e9a20fb41e27c6 | |
| parent | 1bc1538613d66cef3cbce680fc8d7c3561a0fbd0 (diff) | |
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 <hs@denx.de>
| -rw-r--r-- | board/keymile/common/common.c | 20 | ||||
| -rw-r--r-- | drivers/i2c/fsl_i2c.c | 6 | ||||
| -rw-r--r-- | include/configs/kmeter1.h | 1 |
3 files changed, 26 insertions, 1 deletions
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 diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c index 6ab7d3d9fc..ce0f301e13 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 */ diff --git a/include/configs/kmeter1.h b/include/configs/kmeter1.h index 347b47c651..63ecdae0e0 100644 --- a/include/configs/kmeter1.h +++ b/include/configs/kmeter1.h @@ -33,7 +33,6 @@ /* include common defines/options for all Keymile boards */ #include "keymile-common.h" -#undef CONFIG_SYS_I2C_INIT_BOARD #define CONFIG_MISC_INIT_R 1 /* * System Clock Setup |