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

   1 /*
   2  * arch/arm/mach-ixp4xx/miccpt-pci.c
   3  *
   4  * MICCPT board-level PCI initialization
   5  *
   6  * Copyright (C) 2002 Intel Corporation.
   7  * Copyright (C) 2003-2004 MontaVista Software, Inc.
   8  * Copyright (C) 2006 OMICRON electronics GmbH
   9  *
  10  * Author: Michael Jochum <michael.jochum@omicron.at>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  *
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/pci.h>
  20 #include <linux/init.h>
  21 #include <linux/delay.h>
  22 #include <linux/irq.h>
  23 #include <asm/mach/pci.h>
  24 #include <asm/irq.h>
  25 #include <mach/hardware.h>
  26 #include <asm/mach-types.h>
  27
  28 #define MAX_DEV         4
  29 #define IRQ_LINES       4
  30
  31 /* PCI controller GPIO to IRQ pin mappings */
  32 #define INTA            1
  33 #define INTB            2
  34 #define INTC            3
  35 #define INTD            4
  36
  37
  38 void __init miccpt_pci_preinit(void)
  39 {
  40         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  41         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  42         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  43         irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  44         ixp4xx_pci_preinit();
  45 }
  46
  47 static int __init miccpt_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  48 {
  49         static int pci_irq_table[IRQ_LINES] = {
  50                 IXP4XX_GPIO_IRQ(INTA),
  51                 IXP4XX_GPIO_IRQ(INTB),
  52                 IXP4XX_GPIO_IRQ(INTC),
  53                 IXP4XX_GPIO_IRQ(INTD)
  54         };
  55
  56         if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  57                 return pci_irq_table[(slot + pin - 2) % 4];
  58
  59         return -1;
  60 }
  61
  62 struct hw_pci miccpt_pci __initdata = {
  63         .nr_controllers = 1,
  64         .preinit        = miccpt_pci_preinit,
  65         .swizzle        = pci_std_swizzle,
  66         .setup          = ixp4xx_setup,
  67         .scan           = ixp4xx_scan_bus,
  68         .map_irq        = miccpt_map_irq,
  69 };
  70
  71 int __init miccpt_pci_init(void)
  72 {
  73         if (machine_is_miccpt())
  74                 pci_common_init(&miccpt_pci);
  75         return 0;
  76 }
  77
  78 subsys_initcall(miccpt_pci_init);