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Subject[RFC 2/2] net: bcmgenet: Fetch MAC address from the adapter
Date
ARM/ACPI machines should utilize self describing hardware
when possible. The MAC address on the BCM GENET can be
read from the adapter if a full featured firmware has already
programmed it. Lets try using the address already programmed,
if it appears to be valid.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
---
.../net/ethernet/broadcom/genet/bcmgenet.c | 47 ++++++++++++++-----
1 file changed, 36 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index c736700f829e..6782bb0a24bd 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -2779,6 +2779,27 @@ static void bcmgenet_set_hw_addr(struct bcmgenet_priv *priv,
bcmgenet_umac_writel(priv, (addr[4] << 8) | addr[5], UMAC_MAC1);
}

+static void bcmgenet_get_hw_addr(struct bcmgenet_priv *priv,
+ unsigned char *addr)
+{
+ u32 addr_tmp;
+ bool acpi_mode = has_acpi_companion(&priv->pdev->dev);
+
+ /* UEFI/ACPI machines and possibly others will preprogram the MAC */
+ if (acpi_mode) {
+ addr_tmp = bcmgenet_umac_readl(priv, UMAC_MAC0);
+ addr[0] = addr_tmp >> 24;
+ addr[1] = (addr_tmp >> 16) & 0xff;
+ addr[2] = (addr_tmp >> 8) & 0xff;
+ addr[3] = addr_tmp & 0xff;
+ addr_tmp = bcmgenet_umac_readl(priv, UMAC_MAC1);
+ addr[4] = (addr_tmp >> 8) & 0xff;
+ addr[5] = addr_tmp & 0xff;
+ } else {
+ memset(addr, 0, ETH_ALEN);
+ }
+}
+
/* Returns a reusable dma control register value */
static u32 bcmgenet_dma_disable(struct bcmgenet_priv *priv)
{
@@ -3509,11 +3530,6 @@ static int bcmgenet_probe(struct platform_device *pdev)
}
priv->wol_irq = platform_get_irq_optional(pdev, 2);

- if (dn)
- macaddr = of_get_mac_address(dn);
- else if (pd)
- macaddr = pd->mac_address;
-
priv->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->base)) {
err = PTR_ERR(priv->base);
@@ -3524,12 +3540,6 @@ static int bcmgenet_probe(struct platform_device *pdev)

SET_NETDEV_DEV(dev, &pdev->dev);
dev_set_drvdata(&pdev->dev, dev);
- if (IS_ERR_OR_NULL(macaddr) || !is_valid_ether_addr(macaddr)) {
- dev_warn(&pdev->dev, "using random Ethernet MAC\n");
- eth_hw_addr_random(dev);
- } else {
- ether_addr_copy(dev->dev_addr, macaddr);
- }
dev->watchdog_timeo = 2 * HZ;
dev->ethtool_ops = &bcmgenet_ethtool_ops;
dev->netdev_ops = &bcmgenet_netdev_ops;
@@ -3601,6 +3611,21 @@ static int bcmgenet_probe(struct platform_device *pdev)
!strcasecmp(phy_mode_str, "internal"))
bcmgenet_power_up(priv, GENET_POWER_PASSIVE);

+ if (dn)
+ macaddr = of_get_mac_address(dn);
+ else if (pd)
+ macaddr = pd->mac_address;
+
+ if (IS_ERR_OR_NULL(macaddr) || !is_valid_ether_addr(macaddr)) {
+ bcmgenet_get_hw_addr(priv, dev->dev_addr);
+ if (!is_valid_ether_addr(dev->dev_addr)) {
+ dev_warn(&pdev->dev, "using random Ethernet MAC\n");
+ eth_hw_addr_random(dev);
+ }
+ } else {
+ ether_addr_copy(dev->dev_addr, macaddr);
+ }
+
reset_umac(priv);

err = bcmgenet_mii_init(dev);
--
2.24.1
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