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path: root/drivers/i2c/omap24xx_i2c.c
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Diffstat (limited to 'drivers/i2c/omap24xx_i2c.c')
-rw-r--r--drivers/i2c/omap24xx_i2c.c20
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c
index af454f901c7..54e9b1586fb 100644
--- a/drivers/i2c/omap24xx_i2c.c
+++ b/drivers/i2c/omap24xx_i2c.c
@@ -31,7 +31,7 @@ DECLARE_GLOBAL_DATA_PTR;
#define I2C_TIMEOUT 1000
-static void wait_for_bb(void);
+static int wait_for_bb(void);
static u16 wait_for_pin(void);
static void flush_fifo(void);
@@ -159,7 +159,8 @@ static int i2c_read_byte(u8 devaddr, u16 regoffset, u8 alen, u8 *value)
u16 w;
/* wait until bus not busy */
- wait_for_bb();
+ if (wait_for_bb())
+ return 1;
/* one byte only */
writew(alen, &i2c_base->cnt);
@@ -263,7 +264,8 @@ int i2c_probe(uchar chip)
return res;
/* wait until bus not busy */
- wait_for_bb();
+ if (wait_for_bb())
+ return res;
/* try to read one byte */
writew(1, &i2c_base->cnt);
@@ -282,7 +284,10 @@ int i2c_probe(uchar chip)
res = 1;
writew(0xff, &i2c_base->stat);
writew (readw (&i2c_base->con) | I2C_CON_STP, &i2c_base->con);
- wait_for_bb ();
+
+ if (wait_for_bb())
+ res = 1;
+
break;
}
if (status & I2C_STAT_ARDY) {
@@ -355,7 +360,8 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
}
/* wait until bus not busy */
- wait_for_bb();
+ if (wait_for_bb())
+ return 1;
/* start address phase - will write regoffset + len bytes data */
/* TODO consider case when !CONFIG_OMAP243X/34XX/44XX */
@@ -399,7 +405,7 @@ write_exit:
return i2c_error;
}
-static void wait_for_bb(void)
+static int wait_for_bb(void)
{
int timeout = I2C_TIMEOUT;
u16 stat;
@@ -413,8 +419,10 @@ static void wait_for_bb(void)
if (timeout <= 0) {
printf("timed out in wait_for_bb: I2C_STAT=%x\n",
readw(&i2c_base->stat));
+ return 1;
}
writew(0xFFFF, &i2c_base->stat); /* clear delayed stuff*/
+ return 0;
}
static u16 wait_for_pin(void)