[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>
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 7e3353f..2e29972 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -92,6 +92,10 @@
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 @@
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 @@
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 @@
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 @@
}
}
- 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 @@
return 0;
err_out_unregister:
+ pci_disable_msi(pdev);
if (dev1) {
unregister_netdev(dev1);
free_netdev(dev1);
@@ -3177,6 +3249,7 @@
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);