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(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
  40 static 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
  49 static 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
  56 subsys_initcall(personal_pci_init);