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| author | Mike Frysinger <vapier@gentoo.org> | 2009-10-14 19:27:26 -0400 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2009-10-30 15:10:58 +0100 |
| commit | 3814ea4f0002536ac592480b2cdafa319a16e329 (patch) | |
| tree | 0dc7c33077544e7e04729f15c925542ba2a40916 | |
| parent | f2b4bc04d6aed6be712d236dab48ac4c4da22cbf (diff) | |
| download | u-boot-imx-3814ea4f0002536ac592480b2cdafa319a16e329.zip u-boot-imx-3814ea4f0002536ac592480b2cdafa319a16e329.tar.gz u-boot-imx-3814ea4f0002536ac592480b2cdafa319a16e329.tar.bz2 | |
Blackfin: TWI/I2C: add timeout to transfer
The current transfer code relies on ctrlc() to abort transfers, but this
requires user interactivity. Naturalize the process with a timeout.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
| -rw-r--r-- | drivers/i2c/bfin-twi_i2c.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/i2c/bfin-twi_i2c.c b/drivers/i2c/bfin-twi_i2c.c index e790634..5ef30be 100644 --- a/drivers/i2c/bfin-twi_i2c.c +++ b/drivers/i2c/bfin-twi_i2c.c @@ -60,6 +60,9 @@ struct i2c_msg { u8 *abuf; /* addr buffer */ }; +/* Allow msec timeout per ~byte transfer */ +#define I2C_TIMEOUT 10 + /** * wait_for_completion - manage the actual i2c transfer * @msg: the i2c msg @@ -67,8 +70,9 @@ struct i2c_msg { static int wait_for_completion(struct i2c_msg *msg) { uint16_t int_stat; + ulong timebase = get_timer(0); - while (!ctrlc()) { + do { int_stat = bfin_read_TWI_INT_STAT(); if (int_stat & XMTSERV) { @@ -103,7 +107,7 @@ static int wait_for_completion(struct i2c_msg *msg) debugi("processing MERR"); bfin_write_TWI_INT_STAT(MERR); SSYNC(); - break; + return msg->len; } if (int_stat & MCOMP) { debugi("processing MCOMP"); @@ -116,7 +120,12 @@ static int wait_for_completion(struct i2c_msg *msg) } else break; } - } + + /* If we were able to do something, reset timeout */ + if (int_stat) + timebase = get_timer(0); + + } while (get_timer(timebase) < I2C_TIMEOUT); return msg->len; } |