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Commit fb2690a9 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Jeff Garzik
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[PATCH] sky2: add MSI support 



Add MSI support to sky2 driver.

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 77b3d6a2

drivers/net/sky2.c

+77 −4
Original line number Diff line number Diff line
@@ -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)

{
@@ -3121,6 +3184,14 @@ static int __devinit sky2_probe(struct pci_dev *pdev, 
		}

	}



	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",
@@ -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);

drivers/net/sky2.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */