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net: mvneta: read MAC address from hardware when available

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This patch improves the logic used by the mvneta driver to find a MAC
address for a particular interface. Until now, it was only looking at
the Device Tree, and if no address was found, was falling back to
generating a random MAC address.

This patch adds the intermediate solution of reading the MAC address
from the hardware registers, in case it has been set by the
bootloader. So the order is now:

 1) MAC address from the Device Tree
 2) MAC address from the hardware registers
 3) Random MAC address

This requires moving the MAC address initialization a little bit later
in the ->probe() code, because it now requires the hardware registers
to be remapped.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Petazzoni 2013-06-04 04:52:23 +00:00 • committed by David S. Miller
parent 93baf4c615
commit 8cc3e439ab
1 changed files with 35 additions and 9 deletions
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44
drivers/net/ethernet/marvell/mvneta.c
View file

@ -2251,6 +2251,21 @@ static int mvneta_change_mtu(struct net_device *dev, int mtu)
return 0; return 0;
} }
/* Get mac address */
static void mvneta_get_mac_addr(struct mvneta_port *pp, unsigned char *addr)
{
u32 mac_addr_l, mac_addr_h;
mac_addr_l = mvreg_read(pp, MVNETA_MAC_ADDR_LOW);
mac_addr_h = mvreg_read(pp, MVNETA_MAC_ADDR_HIGH);
addr[0] = (mac_addr_h >> 24) & 0xFF;
addr[1] = (mac_addr_h >> 16) & 0xFF;
addr[2] = (mac_addr_h >> 8) & 0xFF;
addr[3] = mac_addr_h & 0xFF;
addr[4] = (mac_addr_l >> 8) & 0xFF;
addr[5] = mac_addr_l & 0xFF;
}
/* Handle setting mac address */ /* Handle setting mac address */
static int mvneta_set_mac_addr(struct net_device *dev, void *addr) static int mvneta_set_mac_addr(struct net_device *dev, void *addr)
{ {
@ -2667,7 +2682,9 @@ static int mvneta_probe(struct platform_device *pdev)
u32 phy_addr; u32 phy_addr;
struct mvneta_port *pp; struct mvneta_port *pp;
struct net_device *dev; struct net_device *dev;
const char *mac_addr; const char *dt_mac_addr;
char hw_mac_addr[ETH_ALEN];
const char *mac_from;
int phy_mode; int phy_mode;
int err; int err;
@ -2703,13 +2720,6 @@ static int mvneta_probe(struct platform_device *pdev)
goto err_free_irq; goto err_free_irq;
} }
mac_addr = of_get_mac_address(dn);
if (!mac_addr || !is_valid_ether_addr(mac_addr))
eth_hw_addr_random(dev);
else
memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
dev->tx_queue_len = MVNETA_MAX_TXD; dev->tx_queue_len = MVNETA_MAX_TXD;
dev->watchdog_timeo = 5 * HZ; dev->watchdog_timeo = 5 * HZ;
dev->netdev_ops = &mvneta_netdev_ops; dev->netdev_ops = &mvneta_netdev_ops;
@ -2740,6 +2750,21 @@ static int mvneta_probe(struct platform_device *pdev)
clk_prepare_enable(pp->clk); clk_prepare_enable(pp->clk);
dt_mac_addr = of_get_mac_address(dn);
if (dt_mac_addr && is_valid_ether_addr(dt_mac_addr)) {
mac_from = "device tree";
memcpy(dev->dev_addr, dt_mac_addr, ETH_ALEN);
} else {
mvneta_get_mac_addr(pp, hw_mac_addr);
if (is_valid_ether_addr(hw_mac_addr)) {
mac_from = "hardware";
memcpy(dev->dev_addr, hw_mac_addr, ETH_ALEN);
} else {
mac_from = "random";
eth_hw_addr_random(dev);
}
}
pp->tx_done_timer.data = (unsigned long)dev; pp->tx_done_timer.data = (unsigned long)dev;
pp->tx_ring_size = MVNETA_MAX_TXD; pp->tx_ring_size = MVNETA_MAX_TXD;
@ -2772,7 +2797,8 @@ static int mvneta_probe(struct platform_device *pdev)
goto err_deinit; goto err_deinit;
} }
netdev_info(dev, "mac: %pM\n", dev->dev_addr); netdev_info(dev, "Using %s mac address %pM\n", mac_from,
dev->dev_addr);
platform_set_drvdata(pdev, pp->dev); platform_set_drvdata(pdev, pp->dev);