arch/arm/mach-ixp4xx/fsg-pci.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/arch/mach-ixp4xx/fsg-pci.c
   4  *
   5  * FSG board-level PCI initialization
   6  *
   7  * Author: Rod Whitby <rod@whitby.id.au>
   8  * Maintainer: http://www.nslu2-linux.org/
   9  *
  10  * based on ixdp425-pci.c:
  11  *      Copyright (C) 2002 Intel Corporation.
  12  *      Copyright (C) 2003-2004 MontaVista Software, Inc.
  13  */
  14
  15 #include <linux/pci.h>
  16 #include <linux/init.h>
  17 #include <linux/irq.h>
  18 #include <asm/mach/pci.h>
  19 #include <asm/mach-types.h>
  20
  21 #include "irqs.h"
  22
  23 #define MAX_DEV         3
  24 #define IRQ_LINES       3
  25
  26 /* PCI controller GPIO to IRQ pin mappings */
  27 #define INTA    6
  28 #define INTB    7
  29 #define INTC    5
  30
  31 void __init fsg_pci_preinit(void)
  32 {
  33         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  34         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  35         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  36         ixp4xx_pci_preinit();
  37 }
  38
  39 static int __init fsg_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  40 {
  41         static int pci_irq_table[IRQ_LINES] = {
  42                 IXP4XX_GPIO_IRQ(INTC),
  43                 IXP4XX_GPIO_IRQ(INTB),
  44                 IXP4XX_GPIO_IRQ(INTA),
  45         };
  46
  47         int irq = -1;
  48         slot -= 11;
  49
  50         if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  51                 irq = pci_irq_table[slot - 1];
  52         printk(KERN_INFO "%s: Mapped slot %d pin %d to IRQ %d\n",
  53                __func__, slot, pin, irq);
  54
  55         return irq;
  56 }
  57
  58 struct hw_pci fsg_pci __initdata = {
  59         .nr_controllers = 1,
  60         .ops            = &ixp4xx_ops,
  61         .preinit =        fsg_pci_preinit,
  62         .setup =          ixp4xx_setup,
  63         .map_irq =        fsg_map_irq,
  64 };
  65
  66 int __init fsg_pci_init(void)
  67 {
  68         if (machine_is_fsg())
  69                 pci_common_init(&fsg_pci);
  70         return 0;
  71 }
  72
  73 subsys_initcall(fsg_pci_init);