netxen: fix legacy interrupts

Fix legacy interrupt mode for NX3031 chips, read pci interrupt state
in hardware to guard against spurious interrupt.

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/netxen/netxen_nic_hdr.h b/drivers/net/netxen/netxen_nic_hdr.h
index ccf6d70064bc..e8e8d73f6ed7 100644
--- a/drivers/net/netxen/netxen_nic_hdr.h
+++ b/drivers/net/netxen/netxen_nic_hdr.h
@@ -843,9 +843,11 @@ enum {
 
 #define PCIE_SETUP_FUNCTION     (0x12040)
 #define PCIE_SETUP_FUNCTION2    (0x12048)
+#define PCIE_MISCCFG_RC         (0x1206c)
 #define PCIE_TGT_SPLIT_CHICKEN  (0x12080)
 #define PCIE_CHICKEN3           (0x120c8)
 
+#define ISR_INT_STATE_REG       (NETXEN_PCIX_PS_REG(PCIE_MISCCFG_RC))
 #define PCIE_MAX_MASTER_SPLIT   (0x14048)
 
 #define NETXEN_PORT_MODE_NONE           0
@@ -861,6 +863,7 @@ enum {
 #define NETXEN_CAM_RAM_DMA_WATCHDOG_CTRL                (0x14)
 
 #define ISR_MSI_INT_TRIGGER(FUNC) (NETXEN_PCIX_PS_REG(PCIX_MSI_F(FUNC)))
+#define ISR_LEGACY_INT_TRIGGERED(VAL)   (((VAL) & 0x300) == 0x200)
 
 /*
  * PCI Interrupt Vector Values.