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| author | Troy Kisky <troy.kisky@boundarydevices.com> | 2012-07-19 08:18:19 +0000 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2012-07-31 07:59:26 +0200 |
| commit | 96c19bd3ef45394acd846d561657bba4c1dc613f (patch) | |
| tree | 2f9f52e518131caa9c99e92366a81c929c810ae3 | |
| parent | e4ff525f91f813456cf42a29227ee4a0fe01788b (diff) | |
| download | u-boot-imx-96c19bd3ef45394acd846d561657bba4c1dc613f.zip u-boot-imx-96c19bd3ef45394acd846d561657bba4c1dc613f.tar.gz u-boot-imx-96c19bd3ef45394acd846d561657bba4c1dc613f.tar.bz2 | |
mxc_i2c: add bus recovery support
Add support for calling a function that will toggle the
SCL line to return the bus to idle condition.
The actual toggling function is added in a later patch.
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
| -rw-r--r-- | drivers/i2c/mxc_i2c.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c index ead6e20..c00ead1 100644 --- a/drivers/i2c/mxc_i2c.c +++ b/drivers/i2c/mxc_i2c.c @@ -251,6 +251,8 @@ static int i2c_init_transfer_(struct mxc_i2c_regs *i2c_regs, return 0; } +static int i2c_idle_bus(void *base); + static int i2c_init_transfer(struct mxc_i2c_regs *i2c_regs, uchar chip, uint addr, int alen) { @@ -269,6 +271,8 @@ static int i2c_init_transfer(struct mxc_i2c_regs *i2c_regs, if (ret != -ERESTART) writeb(0, &i2c_regs->i2cr); /* Disable controller */ udelay(100); + if (i2c_idle_bus(i2c_regs) < 0) + break; } printf("%s: give up i2c_regs=%p\n", __func__, i2c_regs); return ret; @@ -390,6 +394,28 @@ void *get_base(void) #endif } +static struct i2c_parms *i2c_get_parms(void *base) +{ + int i = 0; + struct i2c_parms *p = srdata.i2c_data; + while (i < ARRAY_SIZE(srdata.i2c_data)) { + if (p->base == base) + return p; + p++; + i++; + } + printf("Invalid I2C base: %p\n", base); + return NULL; +} + +static int i2c_idle_bus(void *base) +{ + struct i2c_parms *p = i2c_get_parms(base); + if (p && p->idle_bus_fn) + return p->idle_bus_fn(p->idle_bus_data); + return 0; +} + int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) { return bus_i2c_read(get_base(), chip, addr, alen, buf, len); |