[PATCH] sky2: revert pci express extensions

The pci express error handling extensions don't work unless PCI access is via
mmconfig. Otherwise, all accesses to pci config registers greater than 256 fail.
Since the sky2 driver has other ways of getting to PCI config space, it works
around this short coming, but the pci_find_ext_capablity doesn't work.

This backs out commit 91aeb3edbcf4e6ed72d138ac8c22fd68e6d717c3
Go back to hardcoding, since we know where the error registers are anyway.
Fixes  http://bugzilla.kernel.org/show_bug.cgi?id=7222

Signed-off-by: Stephen Hemminger <shemmminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/sky2.c

@@ -2220,8 +2220,7 @@ static void sky2_hw_intr(struct sky2_hw *hw)
 		/* PCI-Express uncorrectable Error occurred */
 		u32 pex_err;
 
-		pex_err = sky2_pci_read32(hw,
-					  hw->err_cap + PCI_ERR_UNCOR_STATUS);
+		pex_err = sky2_pci_read32(hw, PEX_UNC_ERR_STAT);
 
 		if (net_ratelimit())
 			printk(KERN_ERR PFX "%s: pci express error (0x%x)\n",
@@ -2229,20 +2228,15 @@ static void sky2_hw_intr(struct sky2_hw *hw)
 
 		/* clear the interrupt */
 		sky2_write32(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
-		sky2_pci_write32(hw,
-				 hw->err_cap + PCI_ERR_UNCOR_STATUS,
-				 0xffffffffUL);
+		sky2_pci_write32(hw, PEX_UNC_ERR_STAT,
+				       0xffffffffUL);
 		sky2_write32(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);
 
-
-		/* In case of fatal error mask off to keep from getting stuck */
-		if (pex_err & (PCI_ERR_UNC_POISON_TLP | PCI_ERR_UNC_FCP
-			       | PCI_ERR_UNC_DLP)) {
+		if (pex_err & PEX_FATAL_ERRORS) {
 			u32 hwmsk = sky2_read32(hw, B0_HWE_IMSK);
 			hwmsk &= ~Y2_IS_PCI_EXP;
 			sky2_write32(hw, B0_HWE_IMSK, hwmsk);
 		}
-
 	}
 
 	if (status & Y2_HWE_L1_MASK)
@@ -2423,7 +2417,6 @@ static int sky2_reset(struct sky2_hw *hw)
 	u16 status;
 	u8 t8;
 	int i;
-	u32 msk;
 
 	sky2_write8(hw, B0_CTST, CS_RST_CLR);
 
@@ -2464,13 +2457,9 @@ static int sky2_reset(struct sky2_hw *hw)
 	sky2_write8(hw, B0_CTST, CS_MRST_CLR);
 
 	/* clear any PEX errors */
-	if (pci_find_capability(hw->pdev, PCI_CAP_ID_EXP)) {
-		hw->err_cap = pci_find_ext_capability(hw->pdev, PCI_EXT_CAP_ID_ERR);
-		if (hw->err_cap)
-			sky2_pci_write32(hw,
-					 hw->err_cap + PCI_ERR_UNCOR_STATUS,
-					 0xffffffffUL);
-	}
+	if (pci_find_capability(hw->pdev, PCI_CAP_ID_EXP))
+		sky2_pci_write32(hw, PEX_UNC_ERR_STAT, 0xffffffffUL);
+
 
 	hw->pmd_type = sky2_read8(hw, B2_PMD_TYP);
 	hw->ports = 1;
@@ -2527,10 +2516,7 @@ static int sky2_reset(struct sky2_hw *hw)
 		sky2_write8(hw, RAM_BUFFER(i, B3_RI_RTO_XS2), SK_RI_TO_53);
 	}
 
-	msk = Y2_HWE_ALL_MASK;
-	if (!hw->err_cap)
-		msk &= ~Y2_IS_PCI_EXP;
-	sky2_write32(hw, B0_HWE_IMSK, msk);
+	sky2_write32(hw, B0_HWE_IMSK, Y2_HWE_ALL_MASK);
 
 	for (i = 0; i < hw->ports; i++)
 		sky2_gmac_reset(hw, i);

drivers/net/sky2.h

@@ -6,15 +6,24 @@
 
 #define ETH_JUMBO_MTU		9000	/* Maximum MTU supported */
 
-/* PCI device specific config registers */
+/* PCI config registers */
 enum {
 	PCI_DEV_REG1	= 0x40,
 	PCI_DEV_REG2	= 0x44,
+	PCI_DEV_STATUS  = 0x7c,
 	PCI_DEV_REG3	= 0x80,
 	PCI_DEV_REG4	= 0x84,
 	PCI_DEV_REG5    = 0x88,
 };
 
+enum {
+	PEX_DEV_CAP	= 0xe4,
+	PEX_DEV_CTRL	= 0xe8,
+	PEX_DEV_STA	= 0xea,
+	PEX_LNK_STAT	= 0xf2,
+	PEX_UNC_ERR_STAT= 0x104,
+};
+
 /* Yukon-2 */
 enum pci_dev_reg_1 {
 	PCI_Y2_PIG_ENA	 = 1<<31, /* Enable Plug-in-Go (YUKON-2) */
@@ -63,6 +72,39 @@ enum pci_dev_reg_4 {
 			       PCI_STATUS_REC_MASTER_ABORT | \
 			       PCI_STATUS_REC_TARGET_ABORT | \
 			       PCI_STATUS_PARITY)
+
+enum pex_dev_ctrl {
+	PEX_DC_MAX_RRS_MSK	= 7<<12, /* Bit 14..12:	Max. Read Request Size */
+	PEX_DC_EN_NO_SNOOP	= 1<<11,/* Enable No Snoop */
+	PEX_DC_EN_AUX_POW	= 1<<10,/* Enable AUX Power */
+	PEX_DC_EN_PHANTOM	= 1<<9,	/* Enable Phantom Functions */
+	PEX_DC_EN_EXT_TAG	= 1<<8,	/* Enable Extended Tag Field */
+	PEX_DC_MAX_PLS_MSK	= 7<<5,	/* Bit  7.. 5:	Max. Payload Size Mask */
+	PEX_DC_EN_REL_ORD	= 1<<4,	/* Enable Relaxed Ordering */
+	PEX_DC_EN_UNS_RQ_RP	= 1<<3,	/* Enable Unsupported Request Reporting */
+	PEX_DC_EN_FAT_ER_RP	= 1<<2,	/* Enable Fatal Error Reporting */
+	PEX_DC_EN_NFA_ER_RP	= 1<<1,	/* Enable Non-Fatal Error Reporting */
+	PEX_DC_EN_COR_ER_RP	= 1<<0,	/* Enable Correctable Error Reporting */
+};
+#define  PEX_DC_MAX_RD_RQ_SIZE(x) (((x)<<12) & PEX_DC_MAX_RRS_MSK)
+
+/* PEX_UNC_ERR_STAT	 PEX Uncorrectable Errors Status Register (Yukon-2) */
+enum pex_err {
+	PEX_UNSUP_REQ 	= 1<<20, /* Unsupported Request Error */
+
+	PEX_MALFOR_TLP	= 1<<18, /* Malformed TLP */
+
+	PEX_UNEXP_COMP	= 1<<16, /* Unexpected Completion */
+
+	PEX_COMP_TO	= 1<<14, /* Completion Timeout */
+	PEX_FLOW_CTRL_P	= 1<<13, /* Flow Control Protocol Error */
+	PEX_POIS_TLP	= 1<<12, /* Poisoned TLP */
+
+	PEX_DATA_LINK_P = 1<<4,	/* Data Link Protocol Error */
+	PEX_FATAL_ERRORS= (PEX_MALFOR_TLP | PEX_FLOW_CTRL_P | PEX_DATA_LINK_P),
+};
+
+
 enum csr_regs {
 	B0_RAP		= 0x0000,
 	B0_CTST		= 0x0004,
@@ -1836,7 +1878,6 @@ struct sky2_hw {
 	struct net_device    *dev[2];
 
 	int		     pm_cap;
-	int		     err_cap;
 	u8	     	     chip_id;
 	u8		     chip_rev;
 	u8		     pmd_type;