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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>
This commit is contained in:
Dhananjay Phadke 2008-08-01 03:14:57 -07:00 committed by Jeff Garzik
parent a70f939338
commit d71e1be8ed
2 changed files with 34 additions and 17 deletions
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3
drivers/net/netxen/netxen_nic_hdr.h
View File

@ -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.

48
drivers/net/netxen/netxen_nic_main.c
View File

@ -166,7 +166,8 @@ static void netxen_nic_disable_int(struct netxen_adapter *adapter)
if (!NETXEN_IS_MSI_FAMILY(adapter)) {
do {
adapter->pci_write_immediate(adapter,
ISR_INT_TARGET_STATUS, 0xffffffff);
adapter->legacy_intr.tgt_status_reg,
0xffffffff);
mask = adapter->pci_read_immediate(adapter,
ISR_INT_VECTOR);
if (!(mask & 0x80))
@ -175,7 +176,7 @@ static void netxen_nic_disable_int(struct netxen_adapter *adapter)
} while (--retries);
if (!retries) {
printk(KERN_NOTICE "%s: Failed to disable interrupt completely\n",
printk(KERN_NOTICE "%s: Failed to disable interrupt\n",
netxen_nic_driver_name);
}
} else {
@ -190,8 +191,6 @@ static void netxen_nic_enable_int(struct netxen_adapter *adapter)
{
u32 mask;
DPRINTK(1, INFO, "Entered ISR Enable \n");
if (adapter->intr_scheme != -1 &&
adapter->intr_scheme != INTR_SCHEME_PERPORT) {
switch (adapter->ahw.board_type) {
@ -213,16 +212,13 @@ static void netxen_nic_enable_int(struct netxen_adapter *adapter)
if (!NETXEN_IS_MSI_FAMILY(adapter)) {
mask = 0xbff;
if (adapter->intr_scheme != -1 &&
adapter->intr_scheme != INTR_SCHEME_PERPORT) {
if (adapter->intr_scheme == INTR_SCHEME_PERPORT)
adapter->pci_write_immediate(adapter,
adapter->legacy_intr.tgt_mask_reg, mask);
else
adapter->pci_write_normalize(adapter,
CRB_INT_VECTOR, 0);
}
adapter->pci_write_immediate(adapter,
ISR_INT_TARGET_MASK, mask);
}
DPRINTK(1, INFO, "Done with enable Int\n");
}
static int nx_set_dma_mask(struct netxen_adapter *adapter, uint8_t revision_id)
@ -1538,15 +1534,33 @@ static irqreturn_t netxen_intr(int irq, void *data)
struct netxen_adapter *adapter = data;
u32 our_int = 0;
our_int = adapter->pci_read_normalize(adapter, CRB_INT_VECTOR);
/* not our interrupt */
if ((our_int & (0x80 << adapter->portnum)) == 0)
u32 status = 0;
status = adapter->pci_read_immediate(adapter, ISR_INT_VECTOR);
if (!(status & adapter->legacy_intr.int_vec_bit))
return IRQ_NONE;
if (adapter->intr_scheme == INTR_SCHEME_PERPORT) {
/* claim interrupt */
adapter->pci_write_normalize(adapter, CRB_INT_VECTOR,
if (adapter->ahw.revision_id >= NX_P3_B1) {
/* check interrupt state machine, to be sure */
status = adapter->pci_read_immediate(adapter,
ISR_INT_STATE_REG);
if (!ISR_LEGACY_INT_TRIGGERED(status))
return IRQ_NONE;
} else if (NX_IS_REVISION_P2(adapter->ahw.revision_id)) {
our_int = adapter->pci_read_normalize(adapter, CRB_INT_VECTOR);
/* not our interrupt */
if ((our_int & (0x80 << adapter->portnum)) == 0)
return IRQ_NONE;
if (adapter->intr_scheme == INTR_SCHEME_PERPORT) {
/* claim interrupt */
adapter->pci_write_normalize(adapter,
CRB_INT_VECTOR,
our_int & ~((u32)(0x80 << adapter->portnum)));
}
}
netxen_handle_int(adapter);