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authorWolfgang Denk <wd@denx.de>2011-04-20 22:48:47 +0200
committerWolfgang Denk <wd@denx.de>2011-04-20 22:48:47 +0200
commita94028338c8cfc55665cecb04aeb4f70785db0e1 (patch)
tree8247adbe58b33dd8ba399717bf093bf6f63a48ae /drivers
parent4f27f0ab984b3cabd696b1ad73bbe77e27756c73 (diff)
parent0e57968a215d1b9d271f3fa5bebeddeaea0c8075 (diff)
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Merge branch 'master' of git://git.denx.de/u-boot-i2c
Diffstat (limited to 'drivers')
-rw-r--r--drivers/i2c/omap24xx_i2c.c42
1 files changed, 11 insertions, 31 deletions
diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c
index 215be34..71251d8 100644
--- a/drivers/i2c/omap24xx_i2c.c
+++ b/drivers/i2c/omap24xx_i2c.c
@@ -321,43 +321,23 @@ int i2c_probe (uchar chip)
/* wait until bus not busy */
wait_for_bb ();
- /* try to read one byte */
+ /* try to write one byte */
writew (1, &i2c_base->cnt);
/* set slave address */
writew (chip, &i2c_base->sa);
/* stop bit needed here */
- writew (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP, &i2c_base->con);
+ writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX |
+ I2C_CON_STP, &i2c_base->con);
- while (1) {
- status = wait_for_pin();
- if (status == 0 || status & I2C_STAT_AL) {
- res = 1;
- goto probe_exit;
- }
- if (status & I2C_STAT_NACK) {
- res = 1;
- writew(0xff, &i2c_base->stat);
- writew (readw (&i2c_base->con) | I2C_CON_STP, &i2c_base->con);
- wait_for_bb ();
- break;
- }
- if (status & I2C_STAT_ARDY) {
- writew(I2C_STAT_ARDY, &i2c_base->stat);
- break;
- }
- if (status & I2C_STAT_RRDY) {
- res = 0;
-#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
- defined(CONFIG_OMAP44XX)
- readb(&i2c_base->data);
-#else
- readw(&i2c_base->data);
-#endif
- writew(I2C_STAT_RRDY, &i2c_base->stat);
- }
- }
+ status = wait_for_pin();
+
+ /* check for ACK (!NAK) */
+ if (!(status & I2C_STAT_NACK))
+ res = 0;
+
+ /* abort transfer (force idle state) */
+ writew(0, &i2c_base->con);
-probe_exit:
flush_fifo();
writew (0, &i2c_base->cnt); /* don't allow any more data in...we don't want it.*/
writew(0xFFFF, &i2c_base->stat);