tg3: Fix NVRAM page writes on newer devices

On newer devices, the hardware expects the NVRAM address register
to be written only once per NVRAM page.  To do otherwise causes NVRAM
corruption.  This patch fixes the problem.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/tg3.c

@@ -3140,8 +3140,6 @@ static int tg3_nvram_write_block_buffered(struct tg3 *tp, u32 offset, u32 len,
 
 		phy_addr = tg3_nvram_phys_addr(tp, offset);
 
-		tw32(NVRAM_ADDR, phy_addr);
-
 		nvram_cmd = NVRAM_CMD_GO | NVRAM_CMD_DONE | NVRAM_CMD_WR;
 
 		if (page_off == 0 || i == 0)
@@ -3152,6 +3150,11 @@ static int tg3_nvram_write_block_buffered(struct tg3 *tp, u32 offset, u32 len,
 		if (i == (len - 4))
 			nvram_cmd |= NVRAM_CMD_LAST;
 
+		if ((nvram_cmd & NVRAM_CMD_FIRST) ||
+		    !tg3_flag(tp, FLASH) ||
+		    !tg3_flag(tp, 57765_PLUS))
+			tw32(NVRAM_ADDR, phy_addr);
+
 		if (GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5752 &&
 		    !tg3_flag(tp, 5755_PLUS) &&
 		    (tp->nvram_jedecnum == JEDEC_ST) &&