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| author | Olof Johansson <olof@lixom.net> | 2009-09-29 10:21:29 -0400 |
|---|---|---|
| committer | Tom Rix <Tom.Rix@windriver.com> | 2009-10-13 06:17:37 -0500 |
| commit | 2a6cc97b91997ae485312ac91ffbcea6a89b663a (patch) | |
| tree | f17675c5af12eb4dad8b93249bb3bdda59bfe322 /drivers | |
| parent | 0297ec7e2a4039b8a28346f52f3ccca4db1ddc62 (diff) | |
| download | u-boot-imx-2a6cc97b91997ae485312ac91ffbcea6a89b663a.zip u-boot-imx-2a6cc97b91997ae485312ac91ffbcea6a89b663a.tar.gz u-boot-imx-2a6cc97b91997ae485312ac91ffbcea6a89b663a.tar.bz2 | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/smc911x.c | 14 | ||||
| -rw-r--r-- | drivers/net/smc911x.h | 7 |
2 files changed, 13 insertions, 8 deletions
diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c index 18a729c..b106ec9 100644 --- a/drivers/net/smc911x.c +++ b/drivers/net/smc911x.c @@ -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; } diff --git a/drivers/net/smc911x.h b/drivers/net/smc911x.h index 053e330..d5bca63 100644 --- a/drivers/net/smc911x.h +++ b/drivers/net/smc911x.h @@ -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; } |