LXR linux/arch/arm/mach-footbridge/personal-pci.c

   1/*
   2 * linux/arch/arm/mach-footbridge/personal-pci.c
   3 *
   4 * PCI bios-type initialisation for PCI machines
   5 *
   6 * Bits taken from various places.
   7 */
   8#include <linux/kernel.h>
   9#include <linux/pci.h>
  10#include <linux/init.h>
  11
  12#include <asm/irq.h>
  13#include <asm/mach/pci.h>
  14#include <asm/mach-types.h>
  15
  16static int irqmap_personal_server[] __initdata = {
  17        IRQ_IN0, IRQ_IN1, IRQ_IN2, IRQ_IN3, 0, 0, 0,
  18        IRQ_DOORBELLHOST, IRQ_DMA1, IRQ_DMA2, IRQ_PCI
  19};
  20
  21static int __init personal_server_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  22{
  23        unsigned char line;
  24
  25        pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
  26
  27        if (line > 0x40 && line <= 0x5f) {
  28                /* line corresponds to the bit controlling this interrupt
  29                 * in the footbridge.  Ignore the first 8 interrupt bits,
  30                 * look up the rest in the map.  IN0 is bit number 8
  31                 */
  32                return irqmap_personal_server[(line & 0x1f) - 8];
  33        } else if (line == 0) {
  34                /* no interrupt */
  35                return 0;
  36        } else
  37                return irqmap_personal_server[(line - 1) & 3];
  38}
  39
  40static struct hw_pci personal_server_pci __initdata = {
  41        .map_irq                = personal_server_map_irq,
  42        .nr_controllers         = 1,
  43        .setup                  = dc21285_setup,
  44        .scan                   = dc21285_scan_bus,
  45        .preinit                = dc21285_preinit,
  46        .postinit               = dc21285_postinit,
  47};
  48
  49static int __init personal_pci_init(void)
  50{
  51        if (machine_is_personal_server())
  52                pci_common_init(&personal_server_pci);
  53        return 0;
  54}
  55
  56subsys_initcall(personal_pci_init);
  57