arch/arm/mach-ixp4xx/ixdp425-pci.c

   1 /*
   2  * arch/arm/mach-ixp4xx/ixdp425-pci.c
   3  *
   4  * IXDP425 board-level PCI initialization
   5  *
   6  * Copyright (C) 2002 Intel Corporation.
   7  * Copyright (C) 2003-2004 MontaVista Software, Inc.
   8  *
   9  * Maintainer: Deepak Saxena <dsaxena@plexity.net>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/pci.h>
  19 #include <linux/init.h>
  20 #include <linux/irq.h>
  21 #include <linux/delay.h>
  22 #include <asm/mach/pci.h>
  23 #include <asm/irq.h>
  24 #include <mach/hardware.h>
  25 #include <asm/mach-types.h>
  26
  27 #define MAX_DEV         4
  28 #define IRQ_LINES       4
  29
  30 /* PCI controller GPIO to IRQ pin mappings */
  31 #define INTA            11
  32 #define INTB            10
  33 #define INTC            9
  34 #define INTD            8
  35
  36
  37 void __init ixdp425_pci_preinit(void)
  38 {
  39         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  40         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  41         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  42         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  43         ixp4xx_pci_preinit();
  44 }
  45
  46 static int __init ixdp425_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  47 {
  48         static int pci_irq_table[IRQ_LINES] = {
  49                 IXP4XX_GPIO_IRQ(INTA),
  50                 IXP4XX_GPIO_IRQ(INTB),
  51                 IXP4XX_GPIO_IRQ(INTC),
  52                 IXP4XX_GPIO_IRQ(INTD)
  53         };
  54
  55         if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  56                 return pci_irq_table[(slot + pin - 2) % 4];
  57
  58         return -1;
  59 }
  60
  61 struct hw_pci ixdp425_pci __initdata = {
  62         .nr_controllers = 1,
  63         .preinit        = ixdp425_pci_preinit,
  64         .swizzle        = pci_std_swizzle,
  65         .setup          = ixp4xx_setup,
  66         .scan           = ixp4xx_scan_bus,
  67         .map_irq        = ixdp425_map_irq,
  68 };
  69
  70 int __init ixdp425_pci_init(void)
  71 {
  72         if (machine_is_ixdp425() || machine_is_ixcdp1100() ||
  73                         machine_is_ixdp465() || machine_is_kixrp435())
  74                 pci_common_init(&ixdp425_pci);
  75         return 0;
  76 }
  77
  78 subsys_initcall(ixdp425_pci_init);