From a9a8de214c91eecf596b3e79c7986b74ef17f4ec Mon Sep 17 00:00:00 2001 From: Ben Dooks Date: Mon, 21 Nov 2011 08:57:58 +0000 Subject: [PATCH] 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 Signed-off-by: Stephen Boyd Signed-off-by: David S. Miller --- drivers/net/ethernet/micrel/ks8851.c | 41 +++++++++++++++++++++++----- 1 file changed, 34 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c index f56743a28fc0..d1669bcd4b4d 100644 --- a/drivers/net/ethernet/micrel/ks8851.c +++ b/drivers/net/ethernet/micrel/ks8851.c @@ -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;