arch/arm/mach-ixp4xx/nslu2-pci.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/arm/mach-ixp4xx/nslu2-pci.c
   4  *
   5  * NSLU2 board-level PCI initialization
   6  *
   7  * based on ixdp425-pci.c:
   8  *      Copyright (C) 2002 Intel Corporation.
   9  *      Copyright (C) 2003-2004 MontaVista Software, Inc.
  10  *
  11  * Maintainer: http://www.nslu2-linux.org/
  12  */
  13
  14 #include <linux/pci.h>
  15 #include <linux/init.h>
  16 #include <linux/irq.h>
  17 #include <asm/mach/pci.h>
  18 #include <asm/mach-types.h>
  19
  20 #include "irqs.h"
  21
  22 #define MAX_DEV         3
  23 #define IRQ_LINES       3
  24
  25 /* PCI controller GPIO to IRQ pin mappings */
  26 #define INTA            11
  27 #define INTB            10
  28 #define INTC            9
  29 #define INTD            8
  30
  31 void __init nslu2_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 nslu2_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  40 {
  41         static int pci_irq_table[IRQ_LINES] = {
  42                 IXP4XX_GPIO_IRQ(INTA),
  43                 IXP4XX_GPIO_IRQ(INTB),
  44                 IXP4XX_GPIO_IRQ(INTC),
  45         };
  46
  47         if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  48                 return pci_irq_table[(slot + pin - 2) % IRQ_LINES];
  49
  50         return -1;
  51 }
  52
  53 struct hw_pci __initdata nslu2_pci = {
  54         .nr_controllers = 1,
  55         .ops            = &ixp4xx_ops,
  56         .preinit        = nslu2_pci_preinit,
  57         .setup          = ixp4xx_setup,
  58         .map_irq        = nslu2_map_irq,
  59 };
  60
  61 int __init nslu2_pci_init(void) /* monkey see, monkey do */
  62 {
  63         if (machine_is_nslu2())
  64                 pci_common_init(&nslu2_pci);
  65
  66         return 0;
  67 }
  68
  69 subsys_initcall(nslu2_pci_init);