arch/arm/mach-ixp4xx/nas100d-pci.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/arm/mach-ixp4xx/nas100d-pci.c
   4  *
   5  * NAS 100d 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 #define INTE            7
  31
  32 void __init nas100d_pci_preinit(void)
  33 {
  34         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  35         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  36         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  37         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  38         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTE), IRQ_TYPE_LEVEL_LOW);
  39         ixp4xx_pci_preinit();
  40 }
  41
  42 static int __init nas100d_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  43 {
  44         static int pci_irq_table[MAX_DEV][IRQ_LINES] = {
  45                 { IXP4XX_GPIO_IRQ(INTA), -1, -1 },
  46                 { IXP4XX_GPIO_IRQ(INTB), -1, -1 },
  47                 { IXP4XX_GPIO_IRQ(INTC), IXP4XX_GPIO_IRQ(INTD),
  48                   IXP4XX_GPIO_IRQ(INTE) },
  49         };
  50
  51         if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  52                 return pci_irq_table[slot - 1][pin - 1];
  53
  54         return -1;
  55 }
  56
  57 struct hw_pci __initdata nas100d_pci = {
  58         .nr_controllers = 1,
  59         .ops            = &ixp4xx_ops,
  60         .preinit        = nas100d_pci_preinit,
  61         .setup          = ixp4xx_setup,
  62         .map_irq        = nas100d_map_irq,
  63 };
  64
  65 int __init nas100d_pci_init(void)
  66 {
  67         if (machine_is_nas100d())
  68                 pci_common_init(&nas100d_pci);
  69
  70         return 0;
  71 }
  72
  73 subsys_initcall(nas100d_pci_init);