LXR linux/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
  17static 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
  22static 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
  42static 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
  51static 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
  58subsys_initcall(personal_pci_init);
  59