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r6040: check for absent PHY

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Some devices have two R6040 MACs but the second one
is not wired to any PHY, therefore the interface is
just unusable. Warn the user about that and prevent
device from registering.

Tested-by: bifferos <bifferos@yahoo.co.uk>
Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2009-05-04 20:30:01 +00:00 committed by David S. Miller
parent aee64faf23
commit c8014fe1d4
1 changed files with 8 additions and 0 deletions
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8
drivers/net/r6040.c
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@ -742,6 +742,14 @@ static int r6040_up(struct net_device *dev)
struct r6040_private *lp = netdev_priv(dev);
void __iomem *ioaddr = lp->base;
int ret;
u16 val;
/* Check presence of a second PHY */
val = r6040_phy_read(ioaddr, lp->phy_addr, 2);
if (val == 0xFFFF) {
printk(KERN_ERR DRV_NAME " no second PHY attached\n");
return -EIO;
}
/* Initialise and alloc RX/TX buffers */
r6040_init_txbufs(dev);