e38d523fd0
The cats_map_irq() function in the Simtec CATS support code is mapping IRQ 255 (invalid IRQ) into what is a supposedly valid interrupt numner which can cause problems with other devices then seeing an interrupt they cannot claim. If the IRQ number if >= 255, then return -1 as this is not something we can map. Signed-off-by: Ben Dooks <ben-linux@fluff.org>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
/*
|
|
* linux/arch/arm/mach-footbridge/cats-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>
|
|
#include <asm/mach-types.h>
|
|
|
|
/* cats host-specific stuff */
|
|
static int irqmap_cats[] __initdata = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 };
|
|
|
|
static int __init cats_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
|
|
{
|
|
if (dev->irq >= 255)
|
|
return -1; /* not a valid interrupt. */
|
|
|
|
if (dev->irq >= 128)
|
|
return dev->irq & 0x1f;
|
|
|
|
if (dev->irq >= 1 && dev->irq <= 4)
|
|
return irqmap_cats[dev->irq - 1];
|
|
|
|
if (dev->irq != 0)
|
|
printk("PCI: device %02x:%02x has unknown irq line %x\n",
|
|
dev->bus->number, dev->devfn, dev->irq);
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* why not the standard PCI swizzle? does this prevent 4-port tulip
|
|
* cards being used (ie, pci-pci bridge based cards)?
|
|
*/
|
|
static struct hw_pci cats_pci __initdata = {
|
|
.swizzle = NULL,
|
|
.map_irq = cats_map_irq,
|
|
.nr_controllers = 1,
|
|
.setup = dc21285_setup,
|
|
.scan = dc21285_scan_bus,
|
|
.preinit = dc21285_preinit,
|
|
.postinit = dc21285_postinit,
|
|
};
|
|
|
|
static int __init cats_pci_init(void)
|
|
{
|
|
if (machine_is_cats())
|
|
pci_common_init(&cats_pci);
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(cats_pci_init);
|