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.ki...@boundarydevices.com>
---
v2: commit log change, global data in sram section.
make toggle_i2c return int
v3: rename toggle to idle_bus
---
drivers/i2c/mxc_i2c.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
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);
--
1.7.9.5
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