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Linux/arch/arm/mach-footbridge/personal-pci.c

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  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         .ops                    = &dc21285_ops,
 45         .setup                  = dc21285_setup,
 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);
 58 

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