davinci_emac: davinci_eth_set_mac_addr to ->write_hwaddr

This patch proposes to migrate the davinci_emac driver to using the
eth_device->write_hwaddr function pointer as suggested by Ben Warren.

All the davinci boards had the behaviour, prior to this patch, of
sync'ing the environment variable enetaddr with the MAC address read
from non-volatile storage on boot -- when the two locations disagreed,
the environment variable value took precendence. This patch keeps the
same behaviour but lets eth_initialize take care of it.

This patch refactors davinci_emac setup in the boards so that the MAC
address is read from non-volatile storage into the environment variable
and then the environment variable value is use in eth_intialize. The
only exception is the direct call to davinci_eth_set_mac_addr made by
the da830evm board init which was changed into an assignment of the
enetaddr field.

Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca>
Tested-by: Nick Thompson <nick.thompson@ge.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

arch/arm/include/asm/arch-davinci/emac_defs.h

@@ -367,7 +367,6 @@ typedef struct  {
 
 int davinci_eth_phy_read(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t *data);
 int davinci_eth_phy_write(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t data);
-void davinci_eth_set_mac_addr(const u_int8_t *addr);
 
 typedef struct
 {

arch/arm/lib/board.c

@@ -409,15 +409,6 @@ void start_armboot (void)
 	enable_interrupts ();
 
 	/* Perform network card initialisation if necessary */
-#ifdef CONFIG_DRIVER_TI_EMAC
-	/* XXX: this needs to be moved to board init */
-extern void davinci_eth_set_mac_addr (const u_int8_t *addr);
-	if (getenv ("ethaddr")) {
-		uchar enetaddr[6];
-		eth_getenv_enetaddr("ethaddr", enetaddr);
-		davinci_eth_set_mac_addr(enetaddr);
-	}
-#endif
 
 #if defined(CONFIG_DRIVER_SMC91111) || defined (CONFIG_DRIVER_LAN91C96)
 	/* XXX: this needs to be moved to board init */
@@ -821,16 +812,6 @@ void board_init_r (gd_t *id, ulong dest_addr)
 	enable_interrupts ();
 
 	/* Perform network card initialisation if necessary */
-#ifdef CONFIG_DRIVER_TI_EMAC
-	/* XXX: this needs to be moved to board init */
-extern void davinci_eth_set_mac_addr (const u_int8_t *addr);
-	if (getenv ("ethaddr")) {
-		uchar enetaddr[6];
-		eth_getenv_enetaddr("ethaddr", enetaddr);
-		davinci_eth_set_mac_addr(enetaddr);
-	}
-#endif
-
 #if defined(CONFIG_DRIVER_SMC91111) || defined (CONFIG_DRIVER_LAN91C96)
 	/* XXX: this needs to be moved to board init */
 	if (getenv ("ethaddr")) {

board/davinci/common/misc.c

@@ -85,45 +85,22 @@ err:
 	return 0;
 }
 
-/* If there is a MAC address in the environment, and if it is not identical to
- * the MAC address in the EEPROM, then a warning is printed and the MAC address
- * from the environment is used.
- *
+/*
  * If there is no MAC address in the environment, then it will be initialized
  * (silently) from the value in the EEPROM.
  */
-void dv_configure_mac_address(uint8_t *rom_enetaddr)
+void davinci_sync_env_enetaddr(uint8_t *rom_enetaddr)
 {
-	int i;
-	u_int8_t env_enetaddr[6];
-	char *tmp = getenv("ethaddr");
-	char *end;
-
-	/* Read Ethernet MAC address from the U-Boot environment.
-	 * If it is not defined, env_enetaddr[] will be cleared. */
-	for (i = 0; i < 6; i++) {
-		env_enetaddr[i] = tmp ? simple_strtoul(tmp, &end, 16) : 0;
-		if (tmp)
-			tmp = (*end) ? end+1 : end;
-	}
-
-	/* Check if EEPROM and U-Boot environment MAC addresses match. */
-	if (memcmp(env_enetaddr, "\0\0\0\0\0\0", 6) != 0 &&
-	    memcmp(env_enetaddr, rom_enetaddr, 6) != 0) {
-		printf("Warning: MAC addresses don't match:\n");
-		printf("  EEPROM MAC address: %pM\n", rom_enetaddr);
-		printf("     \"ethaddr\" value: %pM\n", env_enetaddr) ;
-		debug("### Using MAC address from environment\n");
-	}
-	if (!tmp) {
-		char ethaddr[20];
+	uint8_t env_enetaddr[6];
 
+	eth_getenv_enetaddr_by_index(0, env_enetaddr);
+	if (!memcmp(env_enetaddr, "\0\0\0\0\0\0", 6)) {
 		/* There is no MAC address in the environment, so we initialize
 		 * it from the value in the EEPROM. */
-		sprintf(ethaddr, "%pM", rom_enetaddr) ;
-		debug("### Setting environment from EEPROM MAC address = \"%s\"\n",
-		      ethaddr);
-		setenv("ethaddr", ethaddr);
+		debug("### Setting environment from EEPROM MAC address = "
+			"\"%pM\"\n",
+			env_enetaddr);
+		eth_setenv_enetaddr("ethaddr", rom_enetaddr);
 	}
 }
 

board/davinci/common/misc.h

@@ -46,7 +46,7 @@ struct pinmux_resource {
 			  }
 
 int dvevm_read_mac_address(uint8_t *buf);
-void dv_configure_mac_address(uint8_t *rom_enetaddr);
+void davinci_sync_env_enetaddr(uint8_t *rom_enetaddr);
 int davinci_configure_pin_mux(const struct pinmux_config *pins, int n_pins);
 int davinci_configure_pin_mux_items(const struct pinmux_resource *item,
 				    int n_items);

board/davinci/da8xxevm/da830evm.c

@@ -196,19 +196,17 @@ int board_eth_init(bd_t *bis)
 {
 	u_int8_t mac_addr[6];
 	u_int8_t switch_start_cmd[2] = { 0x01, 0x23 };
+	struct eth_device *dev;
 
 	/* Read Ethernet MAC address from EEPROM */
 	if (dvevm_read_mac_address(mac_addr))
 		/* set address env if not already set */
-		dv_configure_mac_address(mac_addr);
+		davinci_sync_env_enetaddr(mac_addr);
 
 	/* read the address back from env */
 	if (!eth_getenv_enetaddr("ethaddr", mac_addr))
 		return -1;
 
-	/* provide the resulting addr to the driver */
-	davinci_eth_set_mac_addr(mac_addr);
-
 	/* enable the Ethernet switch in the 3 port PHY */
 	if (i2c_write(PHY_SW_I2C_ADDR, 0, 0,
 			switch_start_cmd, sizeof(switch_start_cmd))) {
@@ -222,6 +220,12 @@ int board_eth_init(bd_t *bis)
 		return -1;
 	}
 
+	dev = eth_get_dev();
+
+	/* provide the resulting addr to the driver */
+	memcpy(dev->enetaddr, mac_addr, 6);
+	dev->write_hwaddr(dev);
+
 	return 0;
 }
 #endif /* CONFIG_DRIVER_TI_EMAC */

board/davinci/dm365evm/dm365evm.c

@@ -68,7 +68,7 @@ int board_eth_init(bd_t *bis)
 
 	/* Read Ethernet MAC address from EEPROM */
 	if (dvevm_read_mac_address(eeprom_enetaddr))
-		dv_configure_mac_address(eeprom_enetaddr);
+		davinci_sync_env_enetaddr(eeprom_enetaddr);
 
 	davinci_emac_initialize();
 

board/davinci/dvevm/dvevm.c

@@ -71,7 +71,7 @@ int misc_init_r(void)
 
 	/* Read Ethernet MAC address from EEPROM if available. */
 	if (dvevm_read_mac_address(eeprom_enetaddr))
-		dv_configure_mac_address(eeprom_enetaddr);
+		davinci_sync_env_enetaddr(eeprom_enetaddr);
 
 	i2c_read(0x39, 0x00, 1, &video_mode, 1);
 

board/davinci/sffsdr/sffsdr.c

@@ -141,7 +141,7 @@ int misc_init_r(void)
 
 	/* Read Ethernet MAC address from EEPROM if available. */
 	if (sffsdr_read_mac_address(eeprom_enetaddr))
-		dv_configure_mac_address(eeprom_enetaddr);
+		davinci_sync_env_enetaddr(eeprom_enetaddr);
 
 	return(0);
 }

board/davinci/sonata/sonata.c

@@ -70,7 +70,7 @@ int misc_init_r(void)
 
 	/* Read Ethernet MAC address from EEPROM if available. */
 	if (dvevm_read_mac_address(eeprom_enetaddr))
-		dv_configure_mac_address(eeprom_enetaddr);
+		davinci_sync_env_enetaddr(eeprom_enetaddr);
 
 	return(0);
 }

drivers/net/davinci_emac.c

@@ -65,21 +65,6 @@ void eth_mdio_enable(void)
 	davinci_eth_mdio_enable();
 }
 
-static u_int8_t davinci_eth_mac_addr[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
-
-/*
- * This function must be called before emac_open() if you want to override
- * the default mac address.
- */
-void davinci_eth_set_mac_addr(const u_int8_t *addr)
-{
-	int i;
-
-	for (i = 0; i < sizeof (davinci_eth_mac_addr); i++) {
-		davinci_eth_mac_addr[i] = addr[i];
-	}
-}
-
 /* EMAC Addresses */
 static volatile emac_regs	*adap_emac = (emac_regs *)EMAC_BASE_ADDR;
 static volatile ewrap_regs	*adap_ewrap = (ewrap_regs *)EMAC_WRAPPER_BASE_ADDR;
@@ -100,6 +85,43 @@ static volatile u_int8_t	active_phy_addr = 0xff;
 
 phy_t				phy;
 
+static int davinci_eth_set_mac_addr(struct eth_device *dev)
+{
+	unsigned long		mac_hi;
+	unsigned long		mac_lo;
+
+	/*
+	 * Set MAC Addresses & Init multicast Hash to 0 (disable any multicast
+	 * receive)
+	 *  Using channel 0 only - other channels are disabled
+	 *  */
+	writel(0, &adap_emac->MACINDEX);
+	mac_hi = (dev->enetaddr[3] << 24) |
+		 (dev->enetaddr[2] << 16) |
+		 (dev->enetaddr[1] << 8)  |
+		 (dev->enetaddr[0]);
+	mac_lo = (dev->enetaddr[5] << 8) |
+		 (dev->enetaddr[4]);
+
+	writel(mac_hi, &adap_emac->MACADDRHI);
+#if defined(DAVINCI_EMAC_VERSION2)
+	writel(mac_lo | EMAC_MAC_ADDR_IS_VALID | EMAC_MAC_ADDR_MATCH,
+	       &adap_emac->MACADDRLO);
+#else
+	writel(mac_lo, &adap_emac->MACADDRLO);
+#endif
+
+	writel(0, &adap_emac->MACHASH1);
+	writel(0, &adap_emac->MACHASH2);
+
+	/* Set source MAC address - REQUIRED */
+	writel(mac_hi, &adap_emac->MACSRCADDRHI);
+	writel(mac_lo, &adap_emac->MACSRCADDRLO);
+
+
+	return 0;
+}
+
 static void davinci_eth_mdio_enable(void)
 {
 	u_int32_t	clkdiv;
@@ -286,8 +308,6 @@ static int davinci_eth_open(struct eth_device *dev, bd_t *bis)
 	dv_reg_p		addr;
 	u_int32_t		clkdiv, cnt;
 	volatile emac_desc	*rx_desc;
-	unsigned long		mac_hi;
-	unsigned long		mac_lo;
 
 	debug_emac("+ emac_open\n");
 
@@ -311,30 +331,7 @@ static int davinci_eth_open(struct eth_device *dev, bd_t *bis)
 	writel(1, &adap_emac->TXCONTROL);
 	writel(1, &adap_emac->RXCONTROL);
 
-	/* Set MAC Addresses & Init multicast Hash to 0 (disable any multicast receive) */
-	/* Using channel 0 only - other channels are disabled */
-	writel(0, &adap_emac->MACINDEX);
-	mac_hi = (davinci_eth_mac_addr[3] << 24) |
-		 (davinci_eth_mac_addr[2] << 16) |
-		 (davinci_eth_mac_addr[1] << 8)  |
-		 (davinci_eth_mac_addr[0]);
-	mac_lo = (davinci_eth_mac_addr[5] << 8) |
-		 (davinci_eth_mac_addr[4]);
-
-	writel(mac_hi, &adap_emac->MACADDRHI);
-#if defined(DAVINCI_EMAC_VERSION2)
-	writel(mac_lo | EMAC_MAC_ADDR_IS_VALID | EMAC_MAC_ADDR_MATCH,
-	       &adap_emac->MACADDRLO);
-#else
-	writel(mac_lo, &adap_emac->MACADDRLO);
-#endif
-
-	writel(0, &adap_emac->MACHASH1);
-	writel(0, &adap_emac->MACHASH2);
-
-	/* Set source MAC address - REQUIRED */
-	writel(mac_hi, &adap_emac->MACSRCADDRHI);
-	writel(mac_lo, &adap_emac->MACSRCADDRLO);
+	davinci_eth_set_mac_addr(dev);
 
 	/* Set DMA 8 TX / 8 RX Head pointers to 0 */
 	addr = &adap_emac->TX0HDP;
@@ -636,6 +633,7 @@ int davinci_emac_initialize(void)
 	dev->halt = davinci_eth_close;
 	dev->send = davinci_eth_send_packet;
 	dev->recv = davinci_eth_rcv_packet;
+	dev->write_hwaddr = davinci_eth_set_mac_addr;
 
 	eth_register(dev);