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
  16 static 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
  21 static int __init personal_server_map_irq(const struct pci_dev *dev, u8 slot,
  22         u8 pin)
  23 {
  24         unsigned char line;
  25
  26         pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
  27
  28         if (line > 0x40 && line <= 0x5f) {
  29                 /* line corresponds to the bit controlling this interrupt
  30                  * in the footbridge.  Ignore the first 8 interrupt bits,
  31                  * look up the rest in the map.  IN0 is bit number 8
  32                  */
  33                 return irqmap_personal_server[(line & 0x1f) - 8];
  34         } else if (line == 0) {
  35                 /* no interrupt */
  36                 return 0;
  37         } else
  38                 return irqmap_personal_server[(line - 1) & 3];
  39 }
  40
  41 static struct hw_pci personal_server_pci __initdata = {
  42         .map_irq                = personal_server_map_irq,
  43         .nr_controllers         = 1,
  44         .setup                  = dc21285_setup,
  45         .scan                   = dc21285_scan_bus,
  46         .preinit                = dc21285_preinit,
  47         .postinit               = dc21285_postinit,
  48 };
  49
  50 static int __init personal_pci_init(void)
  51 {
  52         if (machine_is_personal_server())
  53                 pci_common_init(&personal_server_pci);
  54         return 0;
  55 }
  56
  57 subsys_initcall(personal_pci_init);