cxgb3: Use PCI Express Capability accessors

Use PCI Express Capability access functions to simplify cxgb3 driver.

[bhelgaas: split cxgb3 and cxgb4 into separate patches]
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/net/ethernet/chelsio/cxgb3/t3_hw.c

@@ -3289,22 +3289,18 @@ static void config_pcie(struct adapter *adap)
 	unsigned int log2_width, pldsize;
 	unsigned int fst_trn_rx, fst_trn_tx, acklat, rpllmt;
 
-	pci_read_config_word(adap->pdev,
-			     adap->pdev->pcie_cap + PCI_EXP_DEVCTL,
-			     &val);
+	pcie_capability_read_word(adap->pdev, PCI_EXP_DEVCTL, &val);
 	pldsize = (val & PCI_EXP_DEVCTL_PAYLOAD) >> 5;
 
 	pci_read_config_word(adap->pdev, 0x2, &devid);
 	if (devid == 0x37) {
-		pci_write_config_word(adap->pdev,
-				      adap->pdev->pcie_cap + PCI_EXP_DEVCTL,
-				      val & ~PCI_EXP_DEVCTL_READRQ &
-				      ~PCI_EXP_DEVCTL_PAYLOAD);
+		pcie_capability_write_word(adap->pdev, PCI_EXP_DEVCTL,
+					   val & ~PCI_EXP_DEVCTL_READRQ &
+					   ~PCI_EXP_DEVCTL_PAYLOAD);
 		pldsize = 0;
 	}
 
-	pci_read_config_word(adap->pdev, adap->pdev->pcie_cap + PCI_EXP_LNKCTL,
-			     &val);
+	pcie_capability_read_word(adap->pdev, PCI_EXP_LNKCTL, &val);
 
 	fst_trn_tx = G_NUMFSTTRNSEQ(t3_read_reg(adap, A_PCIE_PEX_CTRL0));
 	fst_trn_rx = adap->params.rev == 0 ? fst_trn_tx :
@@ -3425,15 +3421,13 @@ out_err:
 static void get_pci_mode(struct adapter *adapter, struct pci_params *p)
 {
 	static unsigned short speed_map[] = { 33, 66, 100, 133 };
-	u32 pci_mode, pcie_cap;
+	u32 pci_mode;
 
-	pcie_cap = pci_pcie_cap(adapter->pdev);
-	if (pcie_cap) {
+	if (pci_is_pcie(adapter->pdev)) {
 		u16 val;
 
 		p->variant = PCI_VARIANT_PCIE;
-		pci_read_config_word(adapter->pdev, pcie_cap + PCI_EXP_LNKSTA,
-					&val);
+		pcie_capability_read_word(adapter->pdev, PCI_EXP_LNKSTA, &val);
 		p->width = (val >> 4) & 0x3f;
 		return;
 	}