bnx2: Fix reset bug on 5709

The 5709 chip requires the BNX2_MISC_NEW_CORE_CTL_DMA_ENABLE bit to be
cleared and polling for pending DMAs to complete before chip reset.
Without this step, we've seen NMIs during repeated resets of the chip.

Signed-off-by: Eddie Wai <waie@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2.c

@@ -4640,13 +4640,28 @@ bnx2_reset_chip(struct bnx2 *bp, u32 reset_code)
 
 	/* Wait for the current PCI transaction to complete before
 	 * issuing a reset. */
-	REG_WR(bp, BNX2_MISC_ENABLE_CLR_BITS,
-	       BNX2_MISC_ENABLE_CLR_BITS_TX_DMA_ENABLE |
-	       BNX2_MISC_ENABLE_CLR_BITS_DMA_ENGINE_ENABLE |
-	       BNX2_MISC_ENABLE_CLR_BITS_RX_DMA_ENABLE |
-	       BNX2_MISC_ENABLE_CLR_BITS_HOST_COALESCE_ENABLE);
-	val = REG_RD(bp, BNX2_MISC_ENABLE_CLR_BITS);
-	udelay(5);
+	if ((CHIP_NUM(bp) == CHIP_NUM_5706) ||
+	    (CHIP_NUM(bp) == CHIP_NUM_5708)) {
+		REG_WR(bp, BNX2_MISC_ENABLE_CLR_BITS,
+		       BNX2_MISC_ENABLE_CLR_BITS_TX_DMA_ENABLE |
+		       BNX2_MISC_ENABLE_CLR_BITS_DMA_ENGINE_ENABLE |
+		       BNX2_MISC_ENABLE_CLR_BITS_RX_DMA_ENABLE |
+		       BNX2_MISC_ENABLE_CLR_BITS_HOST_COALESCE_ENABLE);
+		val = REG_RD(bp, BNX2_MISC_ENABLE_CLR_BITS);
+		udelay(5);
+	} else {  /* 5709 */
+		val = REG_RD(bp, BNX2_MISC_NEW_CORE_CTL);
+		val &= ~BNX2_MISC_NEW_CORE_CTL_DMA_ENABLE;
+		REG_WR(bp, BNX2_MISC_NEW_CORE_CTL, val);
+		val = REG_RD(bp, BNX2_MISC_NEW_CORE_CTL);
+
+		for (i = 0; i < 100; i++) {
+			msleep(1);
+			val = REG_RD(bp, BNX2_PCICFG_DEVICE_CONTROL);
+			if (!(val & BNX2_PCICFG_DEVICE_STATUS_NO_PEND))
+				break;
+		}
+	}
 
 	/* Wait for the firmware to tell us it is ok to issue a reset. */
 	bnx2_fw_sync(bp, BNX2_DRV_MSG_DATA_WAIT0 | reset_code, 1, 1);

drivers/net/bnx2.h

@@ -461,6 +461,8 @@ struct l2_fhdr {
 #define BNX2_PCICFG_MAILBOX_QUEUE_ADDR			0x00000090
 #define BNX2_PCICFG_MAILBOX_QUEUE_DATA			0x00000094
 
+#define BNX2_PCICFG_DEVICE_CONTROL			0x000000b4
+#define BNX2_PCICFG_DEVICE_STATUS_NO_PEND		 ((1L<<5)<<16)
 
 /*
  *  pci_reg definition