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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/arm/mach-footbridge/cats-pci.c
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/*

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 * linux/arch/arm/mach-footbridge/cats-pci.c

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 *

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 * PCI bios-type initialisation for PCI machines

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 *

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 * Bits taken from various places.

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 */

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#include <linux/kernel.h>

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#include <linux/pci.h>

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#include <linux/init.h>

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#include <asm/irq.h>

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#include <asm/mach/pci.h>

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#include <asm/mach-types.h>

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/* cats host-specific stuff */

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static int irqmap_cats[] __initdata = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 };

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static int __init cats_map_irq(struct pci_dev *dev, u8 slot, u8 pin)

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{

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	if (dev->irq >= 255)

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		return -1;	/* not a valid interrupt. */

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	if (dev->irq >= 128)

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		return dev->irq & 0x1f;

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	if (dev->irq >= 1 && dev->irq <= 4)

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		return irqmap_cats[dev->irq - 1];

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	if (dev->irq != 0)

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		printk("PCI: device %02x:%02x has unknown irq line %x\n",

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		       dev->bus->number, dev->devfn, dev->irq);

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	return -1;

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}

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/*

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 * why not the standard PCI swizzle?  does this prevent 4-port tulip

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 * cards being used (ie, pci-pci bridge based cards)?

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 */

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static struct hw_pci cats_pci __initdata = {

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	.swizzle		= NULL,

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	.map_irq		= cats_map_irq,

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	.nr_controllers		= 1,

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	.setup			= dc21285_setup,

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	.scan			= dc21285_scan_bus,

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	.preinit		= dc21285_preinit,

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	.postinit		= dc21285_postinit,

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};

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static int __init cats_pci_init(void)

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{

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	if (machine_is_cats())

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		pci_common_init(&cats_pci);

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	return 0;

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}

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subsys_initcall(cats_pci_init);

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