diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index d4ac6e9..4f9fbe2 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -4865,9 +4865,15 @@
 	pci_write_config_dword(tp->pdev, TG3PCI_COMMAND, tp->pci_cmd);
 
 	/* Make sure PCI-X relaxed ordering bit is clear. */
-	pci_read_config_dword(tp->pdev, TG3PCI_X_CAPS, &val);
-	val &= ~PCIX_CAPS_RELAXED_ORDERING;
-	pci_write_config_dword(tp->pdev, TG3PCI_X_CAPS, val);
+	if (tp->pcix_cap) {
+		u16 pcix_cmd;
+
+		pci_read_config_word(tp->pdev, tp->pcix_cap + PCI_X_CMD,
+				     &pcix_cmd);
+		pcix_cmd &= ~PCI_X_CMD_ERO;
+		pci_write_config_word(tp->pdev, tp->pcix_cap + PCI_X_CMD,
+				      pcix_cmd);
+	}
 
 	if (tp->tg3_flags2 & TG3_FLG2_5780_CLASS) {
 
@@ -6574,16 +6580,20 @@
 	tw32_f(WDMAC_MODE, val);
 	udelay(40);
 
-	if ((tp->tg3_flags & TG3_FLAG_PCIX_MODE) != 0) {
-		val = tr32(TG3PCI_X_CAPS);
+	if (tp->tg3_flags & TG3_FLAG_PCIX_MODE) {
+		u16 pcix_cmd;
+
+		pci_read_config_word(tp->pdev, tp->pcix_cap + PCI_X_CMD,
+				     &pcix_cmd);
 		if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5703) {
-			val &= ~PCIX_CAPS_BURST_MASK;
-			val |= (PCIX_CAPS_MAX_BURST_CPIOB << PCIX_CAPS_BURST_SHIFT);
+			pcix_cmd &= ~PCI_X_CMD_MAX_READ;
+			pcix_cmd |= PCI_X_CMD_READ_2K;
 		} else if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5704) {
-			val &= ~(PCIX_CAPS_SPLIT_MASK | PCIX_CAPS_BURST_MASK);
-			val |= (PCIX_CAPS_MAX_BURST_CPIOB << PCIX_CAPS_BURST_SHIFT);
+			pcix_cmd &= ~(PCI_X_CMD_MAX_SPLIT | PCI_X_CMD_MAX_READ);
+			pcix_cmd |= PCI_X_CMD_READ_2K;
 		}
-		tw32(TG3PCI_X_CAPS, val);
+		pci_write_config_word(tp->pdev, tp->pcix_cap + PCI_X_CMD,
+				      pcix_cmd);
 	}
 
 	tw32_f(RDMAC_MODE, rdmac_mode);
@@ -10712,10 +10722,20 @@
 				       cacheline_sz_reg);
 	}
 
+	if (!(tp->tg3_flags2 & TG3_FLG2_5705_PLUS) ||
+	    (tp->tg3_flags2 & TG3_FLG2_5780_CLASS)) {
+		tp->pcix_cap = pci_find_capability(tp->pdev, PCI_CAP_ID_PCIX);
+		if (!tp->pcix_cap) {
+			printk(KERN_ERR PFX "Cannot find PCI-X "
+					    "capability, aborting.\n");
+			return -EIO;
+		}
+	}
+
 	pci_read_config_dword(tp->pdev, TG3PCI_PCISTATE,
 			      &pci_state_reg);
 
-	if ((pci_state_reg & PCISTATE_CONV_PCI_MODE) == 0) {
+	if (tp->pcix_cap && (pci_state_reg & PCISTATE_CONV_PCI_MODE) == 0) {
 		tp->tg3_flags |= TG3_FLAG_PCIX_MODE;
 
 		/* If this is a 5700 BX chipset, and we are in PCI-X
@@ -10733,11 +10753,13 @@
 			 * space registers clobbered due to this bug.
 			 * So explicitly force the chip into D0 here.
 			 */
-			pci_read_config_dword(tp->pdev, TG3PCI_PM_CTRL_STAT,
+			pci_read_config_dword(tp->pdev,
+					      tp->pm_cap + PCI_PM_CTRL,
 					      &pm_reg);
 			pm_reg &= ~PCI_PM_CTRL_STATE_MASK;
 			pm_reg |= PCI_PM_CTRL_PME_ENABLE | 0 /* D0 */;
-			pci_write_config_dword(tp->pdev, TG3PCI_PM_CTRL_STAT,
+			pci_write_config_dword(tp->pdev,
+					       tp->pm_cap + PCI_PM_CTRL,
 					       pm_reg);
 
 			/* Also, force SERR#/PERR# in PCI command. */
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index a6a23bb..c4f845d 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -57,32 +57,7 @@
 #define TG3PCI_IRQ_PIN			0x0000003d
 #define TG3PCI_MIN_GNT			0x0000003e
 #define TG3PCI_MAX_LAT			0x0000003f
-#define TG3PCI_X_CAPS			0x00000040
-#define  PCIX_CAPS_RELAXED_ORDERING	 0x00020000
-#define  PCIX_CAPS_SPLIT_MASK		 0x00700000
-#define  PCIX_CAPS_SPLIT_SHIFT		 20
-#define  PCIX_CAPS_BURST_MASK		 0x000c0000
-#define  PCIX_CAPS_BURST_SHIFT		 18
-#define  PCIX_CAPS_MAX_BURST_CPIOB	 2
-#define TG3PCI_PM_CAP_PTR		0x00000041
-#define TG3PCI_X_COMMAND		0x00000042
-#define TG3PCI_X_STATUS			0x00000044
-#define TG3PCI_PM_CAP_ID		0x00000048
-#define TG3PCI_VPD_CAP_PTR		0x00000049
-#define TG3PCI_PM_CAPS			0x0000004a
-#define TG3PCI_PM_CTRL_STAT		0x0000004c
-#define TG3PCI_BR_SUPP_EXT		0x0000004e
-#define TG3PCI_PM_DATA			0x0000004f
-#define TG3PCI_VPD_CAP_ID		0x00000050
-#define TG3PCI_MSI_CAP_PTR		0x00000051
-#define TG3PCI_VPD_ADDR_FLAG		0x00000052
-#define  VPD_ADDR_FLAG_WRITE		0x00008000
-#define TG3PCI_VPD_DATA			0x00000054
-#define TG3PCI_MSI_CAP_ID		0x00000058
-#define TG3PCI_NXT_CAP_PTR		0x00000059
-#define TG3PCI_MSI_CTRL			0x0000005a
-#define TG3PCI_MSI_ADDR_LOW		0x0000005c
-#define TG3PCI_MSI_ADDR_HIGH		0x00000060
+/* 0x40 --> 0x64 unused */
 #define TG3PCI_MSI_DATA			0x00000064
 /* 0x66 --> 0x68 unused */
 #define TG3PCI_MISC_HOST_CTRL		0x00000068
@@ -2318,6 +2293,7 @@
 
 	int				pm_cap;
 	int				msi_cap;
+	int				pcix_cap;
 
 	/* PHY info */
 	u32				phy_id;