PCI: quirk to disable e100 interrupt if RESET failed to

Without this quirk, e100 can be pulling on a shared
interrupt line when another device (eg. USB) loads,
causing the interrupt to scream and get disabled.

http://bugzilla.kernel.org/show_bug.cgi?id=5918

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index e3c78c39b7e4..5ca1e94887be 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1511,6 +1511,63 @@ static void __devinit quirk_netmos(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NETMOS, PCI_ANY_ID, quirk_netmos);
 
+static void __devinit quirk_e100_interrupt(struct pci_dev *dev)
+{
+        u16 command;
+        u32 bar;
+        u8 __iomem *csr;
+        u8 cmd_hi;
+
+        switch (dev->device) {
+        /* PCI IDs taken from drivers/net/e100.c */
+        case 0x1029:
+        case 0x1030 ... 0x1034:
+        case 0x1038 ... 0x103E:
+        case 0x1050 ... 0x1057:
+        case 0x1059:
+        case 0x1064 ... 0x106B:
+        case 0x1091 ... 0x1095:
+        case 0x1209:
+        case 0x1229:
+        case 0x2449:
+        case 0x2459:
+        case 0x245D:
+        case 0x27DC:
+                break;
+        default:
+                return;
+        }
+
+        /*
+         * Some firmware hands off the e100 with interrupts enabled,
+         * which can cause a flood of interrupts if packets are
+         * received before the driver attaches to the device.  So
+         * disable all e100 interrupts here.  The driver will
+         * re-enable them when it's ready.
+         */
+        pci_read_config_word(dev, PCI_COMMAND, &command);
+        pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &bar);
+
+        if (!(command & PCI_COMMAND_MEMORY) || !bar)
+                return;
+
+        csr = ioremap(bar, 8);
+        if (!csr) {
+                printk(KERN_WARNING "PCI: Can't map %s e100 registers\n",
+                        pci_name(dev));
+                return;
+        }
+
+        cmd_hi = readb(csr + 3);
+        if (cmd_hi == 0) {
+                printk(KERN_WARNING "PCI: Firmware left %s e100 interrupts "
+                        "enabled, disabling\n", pci_name(dev));
+                writeb(1, csr + 3);
+        }
+
+        iounmap(csr);
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, quirk_e100_interrupt);
 
 static void __devinit fixup_rev1_53c810(struct pci_dev* dev)
 {