release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include <asm/mach/pci.h>
  26 #include <asm/irq.h>
  27 #include <mach/hardware.h>
  28 #include <asm/mach-types.h>
  29
  30 #define AVILA_MAX_DEV   4
  31 #define LOFT_MAX_DEV    6
  32 #define IRQ_LINES       4
  33
  34 /* PCI controller GPIO to IRQ pin mappings */
  35 #define INTA            11
  36 #define INTB            10
  37 #define INTC            9
  38 #define INTD            8
  39
  40 void __init avila_pci_preinit(void)
  41 {
  42         set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  43         set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  44         set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  45         set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  46         ixp4xx_pci_preinit();
  47 }
  48
  49 static int __init avila_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  50 {
  51         static int pci_irq_table[IRQ_LINES] = {
  52                 IXP4XX_GPIO_IRQ(INTA),
  53                 IXP4XX_GPIO_IRQ(INTB),
  54                 IXP4XX_GPIO_IRQ(INTC),
  55                 IXP4XX_GPIO_IRQ(INTD)
  56         };
  57
  58         if (slot >= 1 &&
  59             slot <= (machine_is_loft() ? LOFT_MAX_DEV : AVILA_MAX_DEV) &&
  60             pin >= 1 && pin <= IRQ_LINES)
  61                 return pci_irq_table[(slot + pin - 2) % 4];
  62
  63         return -1;
  64 }
  65
  66 struct hw_pci avila_pci __initdata = {
  67         .nr_controllers = 1,
  68         .preinit        = avila_pci_preinit,
  69         .swizzle        = pci_std_swizzle,
  70         .setup          = ixp4xx_setup,
  71         .scan           = ixp4xx_scan_bus,
  72         .map_irq        = avila_map_irq,
  73 };
  74
  75 int __init avila_pci_init(void)
  76 {
  77         if (machine_is_avila() || machine_is_loft())
  78                 pci_common_init(&avila_pci);
  79         return 0;
  80 }
  81
  82 subsys_initcall(avila_pci_init);