Viewing file:  ftv-pci.c (1.28 KB) -rw-r--r--
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/*
* linux/arch/arm/kernel/ftv-pci.c
*
* PCI bios-type initialisation for PCI machines
*
* Bits taken from various places.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <asm/irq.h>
#include <asm/mach/pci.h>
/*
* Owing to a PCB cockup, issue A backplanes are wired thus:
*
* Slot 1 2 3 4 5 Bridge S1 S2 S3 S4
* IRQ D C B A A C B A D
* A D C B B D C B A
* B A D C C A D C B
* C B A D D B A D C
*
* ID A31 A30 A29 A28 A27 A26 DEV4 DEV5 DEV6 DEV7
*
* Actually, this isn't too bad, because with the processor card
* in slot 5 on the primary bus, the IRQs rotate on both sides
* as you'd expect.
*/
static int irqmap_ftv[] __initdata = { IRQ_PCI_D, IRQ_PCI_C, IRQ_PCI_B, IRQ_PCI_A };
static int __init ftv_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
if (slot > 0x10)
slot--;
return irqmap_ftv[(slot - pin) & 3];
}
static u8 __init ftv_swizzle(struct pci_dev *dev, u8 *pin)
{
return PCI_SLOT(dev->devfn);
}
/* ftv host-specific stuff */
struct hw_pci ftv_pci __initdata = {
init: plx90x0_init,
swizzle: ftv_swizzle,
map_irq: ftv_map_irq,
};
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