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KSZ8851-SNL: Add support for EEPROM MAC address 

Add support for reading the MAC address from the system registers if there
is an EEPROM present. This involves caching the KS_CCR register for later
use (will also be useful for ETHTOOL support) and adding a print to say
that there is an EEPROM present.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Dooks 2011-11-21 08:57:58 +00:00 committed by David S. Miller
parent 072bc80156
commit a9a8de214c
1 changed files with 34 additions and 7 deletions
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41
drivers/net/ethernet/micrel/ks8851.c
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@ -366,22 +366,48 @@ static int ks8851_write_mac_addr(struct net_device *dev)
return 0;
}
/**
* ks8851_read_mac_addr - read mac address from device registers
* @dev: The network device
*
* Update our copy of the KS8851 MAC address from the registers of @dev.
*/
static void ks8851_read_mac_addr(struct net_device *dev)
{
struct ks8851_net *ks = netdev_priv(dev);
int i;
mutex_lock(&ks->lock);
for (i = 0; i < ETH_ALEN; i++)
dev->dev_addr[i] = ks8851_rdreg8(ks, KS_MAR(i));
mutex_unlock(&ks->lock);
}
/**
* ks8851_init_mac - initialise the mac address
* @ks: The device structure
*
* Get or create the initial mac address for the device and then set that
* into the station address register. Currently we assume that the device
* does not have a valid mac address in it, and so we use random_ether_addr()
* into the station address register. If there is an EEPROM present, then
* we try that. If no valid mac address is found we use random_ether_addr()
* to create a new one.
*
* In future, the driver should check to see if the device has an EEPROM
* attached and whether that has a valid ethernet address in it.
*/
static void ks8851_init_mac(struct ks8851_net *ks)
{
struct net_device *dev = ks->netdev;
/* first, try reading what we've got already */
if (ks->rc_ccr & CCR_EEPROM) {
ks8851_read_mac_addr(dev);
if (is_valid_ether_addr(dev->dev_addr))
return;
netdev_err(ks->netdev, "invalid mac address read %pM\n",
dev->dev_addr);
}
random_ether_addr(dev->dev_addr);
ks8851_write_mac_addr(dev);
}
@ -1674,9 +1700,10 @@ static int __devinit ks8851_probe(struct spi_device *spi)
goto err_netdev;
}
netdev_info(ndev, "revision %d, MAC %pM, IRQ %d\n",
netdev_info(ndev, "revision %d, MAC %pM, IRQ %d, %s EEPROM\n",
CIDER_REV_GET(ks8851_rdreg16(ks, KS_CIDER)),
ndev->dev_addr, ndev->irq);
ndev->dev_addr, ndev->irq,
ks->rc_ccr & CCR_EEPROM ? "has" : "no");
return 0;