From 31f4574774e98aa275aeeee94f41ce042285ed8e Mon Sep 17 00:00:00 2001 From: Steve Glendinning Date: Tue, 27 Jan 2009 06:51:12 +0000 Subject: [PATCH] smsc911x: allow mac address to be saved before device reset Some platforms (for example pcm037) do not have an EEPROM fitted, instead storing their mac address somewhere else. The bootloader fetches this and configures the ethernet adapter before the kernel is started. This patch allows a platform to indicate to the driver via the SMSC911X_SAVE_MAC_ADDRESS flag that the mac address has already been configured via such a mechanism, and should be saved before resetting the chip. Signed-off-by: Steve Glendinning Acked-by: Sascha Hauer Tested-by: Sascha Hauer Signed-off-by: David S. Miller --- drivers/net/smsc911x.c | 30 ++++++++++++++++++++++-------- include/linux/smsc911x.h | 1 + 2 files changed, 23 insertions(+), 8 deletions(-) diff --git a/drivers/net/smsc911x.c b/drivers/net/smsc911x.c index 27d2d7c45519..6e175e5555a1 100644 --- a/drivers/net/smsc911x.c +++ b/drivers/net/smsc911x.c @@ -1742,6 +1742,21 @@ static const struct net_device_ops smsc911x_netdev_ops = { #endif }; +/* copies the current mac address from hardware to dev->dev_addr */ +static void __devinit smsc911x_read_mac_address(struct net_device *dev) +{ + struct smsc911x_data *pdata = netdev_priv(dev); + u32 mac_high16 = smsc911x_mac_read(pdata, ADDRH); + u32 mac_low32 = smsc911x_mac_read(pdata, ADDRL); + + dev->dev_addr[0] = (u8)(mac_low32); + dev->dev_addr[1] = (u8)(mac_low32 >> 8); + dev->dev_addr[2] = (u8)(mac_low32 >> 16); + dev->dev_addr[3] = (u8)(mac_low32 >> 24); + dev->dev_addr[4] = (u8)(mac_high16); + dev->dev_addr[5] = (u8)(mac_high16 >> 8); +} + /* Initializing private device structures, only called from probe */ static int __devinit smsc911x_init(struct net_device *dev) { @@ -1829,6 +1844,12 @@ static int __devinit smsc911x_init(struct net_device *dev) SMSC_WARNING(PROBE, "This driver is not intended for this chip revision"); + /* workaround for platforms without an eeprom, where the mac address + * is stored elsewhere and set by the bootloader. This saves the + * mac address before resetting the device */ + if (pdata->config.flags & SMSC911X_SAVE_MAC_ADDRESS) + smsc911x_read_mac_address(dev); + /* Reset the LAN911x */ if (smsc911x_soft_reset(pdata)) return -ENODEV; @@ -2009,14 +2030,7 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev) } else { /* Try reading mac address from device. if EEPROM is present * it will already have been set */ - u32 mac_high16 = smsc911x_mac_read(pdata, ADDRH); - u32 mac_low32 = smsc911x_mac_read(pdata, ADDRL); - dev->dev_addr[0] = (u8)(mac_low32); - dev->dev_addr[1] = (u8)(mac_low32 >> 8); - dev->dev_addr[2] = (u8)(mac_low32 >> 16); - dev->dev_addr[3] = (u8)(mac_low32 >> 24); - dev->dev_addr[4] = (u8)(mac_high16); - dev->dev_addr[5] = (u8)(mac_high16 >> 8); + smsc911x_read_mac_address(dev); if (is_valid_ether_addr(dev->dev_addr)) { /* eeprom values are valid so use them */ diff --git a/include/linux/smsc911x.h b/include/linux/smsc911x.h index 170c76b8f7a6..b32725075d71 100644 --- a/include/linux/smsc911x.h +++ b/include/linux/smsc911x.h @@ -45,5 +45,6 @@ struct smsc911x_platform_config { #define SMSC911X_USE_32BIT (BIT(1)) #define SMSC911X_FORCE_INTERNAL_PHY (BIT(2)) #define SMSC911X_FORCE_EXTERNAL_PHY (BIT(3)) +#define SMSC911X_SAVE_MAC_ADDRESS (BIT(4)) #endif /* __LINUX_SMSC911X_H__ */ -- 2.20.1