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/config.h>
  18 #include <linux/pci.h>
  19 #include <linux/init.h>
  20 #include <linux/delay.h>
  21
  22 #include <asm/mach/pci.h>
  23 #include <asm/irq.h>
  24 #include <asm/hardware.h>
  25 #include <asm/mach-types.h>
  26
  27 void __init ixdp425_pci_preinit(void)
  28 {
  29         gpio_line_config(IXDP425_PCI_INTA_PIN,
  30                                 IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW);
  31         gpio_line_config(IXDP425_PCI_INTB_PIN,
  32                                 IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW);
  33         gpio_line_config(IXDP425_PCI_INTC_PIN,
  34                                 IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW);
  35         gpio_line_config(IXDP425_PCI_INTD_PIN,
  36                                 IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW);
  37
  38         gpio_line_isr_clear(IXDP425_PCI_INTA_PIN);
  39         gpio_line_isr_clear(IXDP425_PCI_INTB_PIN);
  40         gpio_line_isr_clear(IXDP425_PCI_INTC_PIN);
  41         gpio_line_isr_clear(IXDP425_PCI_INTD_PIN);
  42
  43         ixp4xx_pci_preinit();
  44 }
  45
  46 static int __init ixdp425_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  47 {
  48         static int pci_irq_table[IXDP425_PCI_IRQ_LINES] = {
  49                 IRQ_IXDP425_PCI_INTA,
  50                 IRQ_IXDP425_PCI_INTB,
  51                 IRQ_IXDP425_PCI_INTC,
  52                 IRQ_IXDP425_PCI_INTD
  53         };
  54
  55         int irq = -1;
  56
  57         if (slot >= 1 && slot <= IXDP425_PCI_MAX_DEV &&
  58                 pin >= 1 && pin <= IXDP425_PCI_IRQ_LINES) {
  59                 irq = pci_irq_table[(slot + pin - 2) % 4];
  60         }
  61
  62         return irq;
  63 }
  64
  65 struct hw_pci ixdp425_pci __initdata = {
  66         .nr_controllers = 1,
  67         .preinit        = ixdp425_pci_preinit,
  68         .swizzle        = pci_std_swizzle,
  69         .setup          = ixp4xx_setup,
  70         .scan           = ixp4xx_scan_bus,
  71         .map_irq        = ixdp425_map_irq,
  72 };
  73
  74 int __init ixdp425_pci_init(void)
  75 {
  76         if (machine_is_ixdp425() ||
  77                 machine_is_ixcdp1100() ||
  78                 machine_is_avila())
  79                 pci_common_init(&ixdp425_pci);
  80         return 0;
  81 }
  82
  83 subsys_initcall(ixdp425_pci_init);
  84