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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/arch/arm/mach-footbridge/personal-pci.c
   4  *
   5  * PCI bios-type initialisation for PCI machines
   6  *
   7  * Bits taken from various places.
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/pci.h>
  11 #include <linux/init.h>
  12
  13 #include <asm/irq.h>
  14 #include <asm/mach/pci.h>
  15 #include <asm/mach-types.h>
  16
  17 static int irqmap_personal_server[] __initdata = {
  18         IRQ_IN0, IRQ_IN1, IRQ_IN2, IRQ_IN3, 0, 0, 0,
  19         IRQ_DOORBELLHOST, IRQ_DMA1, IRQ_DMA2, IRQ_PCI
  20 };
  21
  22 static int __init personal_server_map_irq(const struct pci_dev *dev, u8 slot,
  23         u8 pin)
  24 {
  25         unsigned char line;
  26
  27         pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
  28
  29         if (line > 0x40 && line <= 0x5f) {
  30                 /* line corresponds to the bit controlling this interrupt
  31                  * in the footbridge.  Ignore the first 8 interrupt bits,
  32                  * look up the rest in the map.  IN0 is bit number 8
  33                  */
  34                 return irqmap_personal_server[(line & 0x1f) - 8];
  35         } else if (line == 0) {
  36                 /* no interrupt */
  37                 return 0;
  38         } else
  39                 return irqmap_personal_server[(line - 1) & 3];
  40 }
  41
  42 static struct hw_pci personal_server_pci __initdata = {
  43         .map_irq                = personal_server_map_irq,
  44         .nr_controllers         = 1,
  45         .ops                    = &dc21285_ops,
  46         .setup                  = dc21285_setup,
  47         .preinit                = dc21285_preinit,
  48         .postinit               = dc21285_postinit,
  49 };
  50
  51 static int __init personal_pci_init(void)
  52 {
  53         if (machine_is_personal_server())
  54                 pci_common_init(&personal_server_pci);
  55         return 0;
  56 }
  57
  58 subsys_initcall(personal_pci_init);