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lan78xx: Read MAC address from DT if present

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There is a standard mechanism for locating and using a MAC address from
the Device Tree. Use this facility in the lan78xx driver to support
applications without programmed EEPROM or OTP. At the same time,
regularise the handling of the different address sources.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Phil Elwell 2018-04-19 17:59:38 +01:00 committed by David S. Miller
parent a83762d979
commit 760db29bdc
1 changed files with 20 additions and 22 deletions
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42
drivers/net/usb/lan78xx.c
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@ -37,6 +37,7 @@
#include <linux/irqchip/chained_irq.h>
#include <linux/microchipphy.h>
#include <linux/phy.h>
#include <linux/of_net.h>
#include "lan78xx.h"
#define DRIVER_AUTHOR "WOOJUNG HUH <woojung.huh@microchip.com>"
@ -1652,34 +1653,31 @@ static void lan78xx_init_mac_address(struct lan78xx_net *dev)
addr[5] = (addr_hi >> 8) & 0xFF;
if (!is_valid_ether_addr(addr)) {
/* reading mac address from EEPROM or OTP */
if ((lan78xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
addr) == 0) ||
(lan78xx_read_otp(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
addr) == 0)) {
if (is_valid_ether_addr(addr)) {
/* eeprom values are valid so use them */
netif_dbg(dev, ifup, dev->net,
"MAC address read from EEPROM");
} else {
/* generate random MAC */
random_ether_addr(addr);
netif_dbg(dev, ifup, dev->net,
"MAC address set to random addr");
}
addr_lo = addr[0] | (addr[1] << 8) |
(addr[2] << 16) | (addr[3] << 24);
addr_hi = addr[4] | (addr[5] << 8);
ret = lan78xx_write_reg(dev, RX_ADDRL, addr_lo);
ret = lan78xx_write_reg(dev, RX_ADDRH, addr_hi);
if (!eth_platform_get_mac_address(&dev->udev->dev, addr)) {
/* valid address present in Device Tree */
netif_dbg(dev, ifup, dev->net,
"MAC address read from Device Tree");
} else if (((lan78xx_read_eeprom(dev, EEPROM_MAC_OFFSET,
ETH_ALEN, addr) == 0) ||
(lan78xx_read_otp(dev, EEPROM_MAC_OFFSET,
ETH_ALEN, addr) == 0)) &&
is_valid_ether_addr(addr)) {
/* eeprom values are valid so use them */
netif_dbg(dev, ifup, dev->net,
"MAC address read from EEPROM");
} else {
/* generate random MAC */
random_ether_addr(addr);
netif_dbg(dev, ifup, dev->net,
"MAC address set to random addr");
}
addr_lo = addr[0] | (addr[1] << 8) |
(addr[2] << 16) | (addr[3] << 24);
addr_hi = addr[4] | (addr[5] << 8);
ret = lan78xx_write_reg(dev, RX_ADDRL, addr_lo);
ret = lan78xx_write_reg(dev, RX_ADDRH, addr_hi);
}
ret = lan78xx_write_reg(dev, MAF_LO(0), addr_lo);