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SMC911X: Add chip auto detection 

Refactor the smc911x driver to allow for detecting when the chip is missing.
I.e. the detect_chip() function is called earlier and will abort gracefully
when the Chip ID read returns all 1's.

Signed-off-by: Olof Johansson <olof@lixom.net>
Acked-by: Dirk Behme <dirk.behme@googlemail.com>
Acked-by: Ben Warren <biggerbadderben@gmail.com>
This commit is contained in:
Olof Johansson 2009-09-29 10:21:29 -04:00 committed by Tom Rix
parent 0297ec7e2a
commit 2a6cc97b91
2 changed files with 13 additions and 8 deletions
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14
drivers/net/smc911x.c
View File

@ -146,10 +146,9 @@ static void smc911x_enable(struct eth_device *dev)
static int smc911x_init(struct eth_device *dev, bd_t * bd)
{
printf(DRIVERNAME ": initializing\n");
struct chip_id *id = dev->priv;
if (smc911x_detect_chip(dev))
goto err_out;
printf(DRIVERNAME ": detected %s controller\n", id->name);
smc911x_reset(dev);
@ -162,9 +161,6 @@ static int smc911x_init(struct eth_device *dev, bd_t * bd)
smc911x_enable(dev);
return 0;
err_out:
return -1;
}
static int smc911x_send(struct eth_device *dev,
@ -268,6 +264,12 @@ int smc911x_initialize(u8 dev_num, int base_addr)
dev->recv = smc911x_rx;
sprintf(dev->name, "%s-%hu", DRIVERNAME, dev_num);
/* Try to detect chip. Will fail if not present. */
if (smc911x_detect_chip(dev)) {
free(dev);
return 0;
}
eth_register(dev);
return 0;
}

7
drivers/net/smc911x.h
View File

@ -441,7 +441,10 @@ static int smc911x_detect_chip(struct eth_device *dev)
unsigned long val, i;
val = smc911x_reg_read(dev, BYTE_TEST);
if (val != 0x87654321) {
if (val == 0xffffffff) {
/* Special case -- no chip present */
return -1;
} else if (val != 0x87654321) {
printf(DRIVERNAME ": Invalid chip endian 0x%08lx\n", val);
return -1;
}
@ -455,7 +458,7 @@ static int smc911x_detect_chip(struct eth_device *dev)
return -1;
}
printf(DRIVERNAME ": detected %s controller\n", chip_ids[i].name);
dev->priv = (void *)&chip_ids[i];
return 0;
}