release/src-rt-6.x/linux/linux-2.6/arch/arm/mach-ixp4xx/avila-pci.c

   1 /*
   2  * arch/arm/mach-ixp4xx/avila-pci.c
   3  *
   4  * Gateworks Avila board-level PCI initialization
   5  *
   6  * Author: Michael-Luke Jones <mlj28@cam.ac.uk>
   7  *
   8  * Based on ixdp-pci.c
   9  * Copyright (C) 2002 Intel Corporation.
  10  * Copyright (C) 2003-2004 MontaVista Software, Inc.
  11  *
  12  * Maintainer: Deepak Saxena <dsaxena@plexity.net>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  *
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/pci.h>
  22 #include <linux/init.h>
  23 #include <linux/irq.h>
  24 #include <linux/delay.h>
  25
  26 #include <asm/mach/pci.h>
  27 #include <asm/irq.h>
  28 #include <asm/hardware.h>
  29 #include <asm/mach-types.h>
  30
  31 void __init avila_pci_preinit(void)
  32 {
  33         set_irq_type(IRQ_AVILA_PCI_INTA, IRQT_LOW);
  34         set_irq_type(IRQ_AVILA_PCI_INTB, IRQT_LOW);
  35         set_irq_type(IRQ_AVILA_PCI_INTC, IRQT_LOW);
  36         set_irq_type(IRQ_AVILA_PCI_INTD, IRQT_LOW);
  37
  38         ixp4xx_pci_preinit();
  39 }
  40
  41 static int __init avila_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  42 {
  43         static int pci_irq_table[AVILA_PCI_IRQ_LINES] = {
  44                 IRQ_AVILA_PCI_INTA,
  45                 IRQ_AVILA_PCI_INTB,
  46                 IRQ_AVILA_PCI_INTC,
  47                 IRQ_AVILA_PCI_INTD
  48         };
  49
  50         int irq = -1;
  51
  52         if (slot >= 1 &&
  53         slot <= (machine_is_loft() ? LOFT_PCI_MAX_DEV : AVILA_PCI_MAX_DEV) &&
  54                 pin >= 1 && pin <= AVILA_PCI_IRQ_LINES) {
  55                 irq = pci_irq_table[(slot + pin - 2) % 4];
  56         }
  57
  58         return irq;
  59 }
  60
  61 struct hw_pci avila_pci __initdata = {
  62         .nr_controllers = 1,
  63         .preinit        = avila_pci_preinit,
  64         .swizzle        = pci_std_swizzle,
  65         .setup          = ixp4xx_setup,
  66         .scan           = ixp4xx_scan_bus,
  67         .map_irq        = avila_map_irq,
  68 };
  69
  70 int __init avila_pci_init(void)
  71 {
  72         if (machine_is_avila() || machine_is_loft())
  73                 pci_common_init(&avila_pci);
  74         return 0;
  75 }
  76
  77 subsys_initcall(avila_pci_init);
  78