arch/arm/mach-ixp4xx/dsmg600-pci.c

   1 /*
   2  * DSM-G600 board-level PCI initialization
   3  *
   4  * Copyright (C) 2006 Tower Technologies
   5  * Author: Alessandro Zummo <a.zummo@towertech.it>
   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  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  *
  17  */
  18
  19 #include <linux/pci.h>
  20 #include <linux/init.h>
  21 #include <linux/irq.h>
  22 #include <asm/mach/pci.h>
  23 #include <asm/mach-types.h>
  24
  25 #define MAX_DEV         4
  26 #define IRQ_LINES       3
  27
  28 /* PCI controller GPIO to IRQ pin mappings */
  29 #define INTA            11
  30 #define INTB            10
  31 #define INTC            9
  32 #define INTD            8
  33 #define INTE            7
  34 #define INTF            6
  35
  36 void __init dsmg600_pci_preinit(void)
  37 {
  38         set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  39         set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  40         set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  41         set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  42         set_irq_type(IXP4XX_GPIO_IRQ(INTE), IRQ_TYPE_LEVEL_LOW);
  43         set_irq_type(IXP4XX_GPIO_IRQ(INTF), IRQ_TYPE_LEVEL_LOW);
  44         ixp4xx_pci_preinit();
  45 }
  46
  47 static int __init dsmg600_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  48 {
  49         static int pci_irq_table[MAX_DEV][IRQ_LINES] = {
  50                 { IXP4XX_GPIO_IRQ(INTE), -1, -1 },
  51                 { IXP4XX_GPIO_IRQ(INTA), -1, -1 },
  52                 { IXP4XX_GPIO_IRQ(INTB), IXP4XX_GPIO_IRQ(INTC),
  53                   IXP4XX_GPIO_IRQ(INTD) },
  54                 { IXP4XX_GPIO_IRQ(INTF), -1, -1 },
  55         };
  56
  57         if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  58                 return pci_irq_table[slot - 1][pin - 1];
  59
  60         return -1;
  61 }
  62
  63 struct hw_pci __initdata dsmg600_pci = {
  64         .nr_controllers = 1,
  65         .preinit        = dsmg600_pci_preinit,
  66         .swizzle        = pci_std_swizzle,
  67         .setup          = ixp4xx_setup,
  68         .scan           = ixp4xx_scan_bus,
  69         .map_irq        = dsmg600_map_irq,
  70 };
  71
  72 int __init dsmg600_pci_init(void)
  73 {
  74         if (machine_is_dsmg600())
  75                 pci_common_init(&dsmg600_pci);
  76
  77         return 0;
  78 }
  79
  80 subsys_initcall(dsmg600_pci_init);