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[PATCH] sky2: add MSI support 

Add MSI support to sky2 driver.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Stephen Hemminger 2006-03-20 15:48:19 -08:00 committed by Jeff Garzik
parent 77b3d6a2d5
commit fb2690a9bf
2 changed files with 79 additions and 4 deletions
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81
drivers/net/sky2.c
View File

@ -92,6 +92,10 @@ static int copybreak __read_mostly = 256;
module_param(copybreak, int, 0);
MODULE_PARM_DESC(copybreak, "Receive copy threshold");
static int disable_msi = 0;
module_param(disable_msi, int, 0);
MODULE_PARM_DESC(disable_msi, "Disable Message Signaled Interrupt (MSI)");
static const struct pci_device_id sky2_id_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9000) },
{ PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9E00) },
@ -2045,7 +2049,7 @@ static int sky2_poll(struct net_device *dev0, int *budget)
struct sky2_hw *hw = ((struct sky2_port *) netdev_priv(dev0))->hw;
int work_limit = min(dev0->quota, *budget);
int work_done = 0;
u32 status = sky2_read32(hw, B0_ISRC);
u32 status = sky2_read32(hw, B0_Y2_SP_EISR);
if (status & Y2_IS_HW_ERR)
sky2_hw_intr(hw);
@ -2075,8 +2079,7 @@ static int sky2_poll(struct net_device *dev0, int *budget)
netif_rx_complete(dev0);
/* Ack interrupt and re-enable */
sky2_write32(hw, B0_Y2_SP_ICR, 2);
status = sky2_read32(hw, B0_Y2_SP_LISR);
return 0;
}
@ -3001,6 +3004,66 @@ static void __devinit sky2_show_addr(struct net_device *dev)
dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
}
/* Handle software interrupt used during MSI test */
static irqreturn_t __devinit sky2_test_intr(int irq, void *dev_id,
struct pt_regs *regs)
{
struct sky2_hw *hw = dev_id;
u32 status = sky2_read32(hw, B0_Y2_SP_ISRC2);
if (status == 0)
return IRQ_NONE;
if (status & Y2_IS_IRQ_SW) {
hw->msi_detected = 1;
wake_up(&hw->msi_wait);
sky2_write8(hw, B0_CTST, CS_CL_SW_IRQ);
}
sky2_write32(hw, B0_Y2_SP_ICR, 2);
return IRQ_HANDLED;
}
/* Test interrupt path by forcing a a software IRQ */
static int __devinit sky2_test_msi(struct sky2_hw *hw)
{
struct pci_dev *pdev = hw->pdev;
int err;
sky2_write32(hw, B0_IMSK, Y2_IS_IRQ_SW);
err = request_irq(pdev->irq, sky2_test_intr, SA_SHIRQ, DRV_NAME, hw);
if (err) {
printk(KERN_ERR PFX "%s: cannot assign irq %d\n",
pci_name(pdev), pdev->irq);
return err;
}
init_waitqueue_head (&hw->msi_wait);
sky2_write8(hw, B0_CTST, CS_ST_SW_IRQ);
wmb();
wait_event_timeout(hw->msi_wait, hw->msi_detected, HZ/10);
if (!hw->msi_detected) {
/* MSI test failed, go back to INTx mode */
printk(KERN_WARNING PFX "%s: No interrupt was generated using MSI, "
"switching to INTx mode. Please report this failure to "
"the PCI maintainer and include system chipset information.\n",
pci_name(pdev));
err = -EOPNOTSUPP;
sky2_write8(hw, B0_CTST, CS_CL_SW_IRQ);
}
sky2_write32(hw, B0_IMSK, 0);
free_irq(pdev->irq, hw);
return err;
}
static int __devinit sky2_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
@ -3121,7 +3184,15 @@ static int __devinit sky2_probe(struct pci_dev *pdev,
}
}
err = request_irq(pdev->irq, sky2_intr, SA_SHIRQ, DRV_NAME, hw);
if (!disable_msi && pci_enable_msi(pdev) == 0) {
err = sky2_test_msi(hw);
if (err == -EOPNOTSUPP)
pci_disable_msi(pdev);
else if (err)
goto err_out_unregister;
}
err = request_irq(pdev->irq, sky2_intr, SA_SHIRQ, DRV_NAME, hw);
if (err) {
printk(KERN_ERR PFX "%s: cannot assign irq %d\n",
pci_name(pdev), pdev->irq);
@ -3135,6 +3206,7 @@ static int __devinit sky2_probe(struct pci_dev *pdev,
return 0;
err_out_unregister:
pci_disable_msi(pdev);
if (dev1) {
unregister_netdev(dev1);
free_netdev(dev1);
@ -3177,6 +3249,7 @@ static void __devexit sky2_remove(struct pci_dev *pdev)
sky2_read8(hw, B0_CTST);
free_irq(pdev->irq, hw);
pci_disable_msi(pdev);
pci_free_consistent(pdev, STATUS_LE_BYTES, hw->st_le, hw->st_dma);
pci_release_regions(pdev);
pci_disable_device(pdev);

2
drivers/net/sky2.h
View File

@ -1879,6 +1879,8 @@ struct sky2_hw {
struct sky2_status_le *st_le;
u32 st_idx;
dma_addr_t st_dma;
int msi_detected;
wait_queue_head_t msi_wait;
};
/* Register accessor for memory mapped device */