arch/arm/mach-iop32x/iq80321-pci.c

   1 /*
   2  * arch/arm/mach-iop32x/iq80321-pci.c
   3  *
   4  * PCI support for the Intel IQ80321 reference board
   5  *
   6  * Author: Rory Bolt <rorybolt@pacbell.net>
   7  * Copyright (C) 2002 Rory Bolt
   8  * Copyright (C) 2004 Intel Corp.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14 #include <linux/kernel.h>
  15 #include <linux/pci.h>
  16 #include <linux/init.h>
  17 #include <linux/string.h>
  18 #include <linux/slab.h>
  19
  20 #include <asm/hardware.h>
  21 #include <asm/irq.h>
  22 #include <asm/mach/pci.h>
  23 #include <asm/mach-types.h>
  24
  25 /*
  26  * The following macro is used to lookup irqs in a standard table
  27  * format for those systems that do not already have PCI
  28  * interrupts properly routed.  We assume 1 <= pin <= 4
  29  */
  30 #define PCI_IRQ_TABLE_LOOKUP(minid,maxid)       \
  31 ({ int _ctl_ = -1;                              \
  32    unsigned int _idsel = idsel - minid;         \
  33    if (_idsel <= maxid)                         \
  34       _ctl_ = pci_irq_table[_idsel][pin-1];     \
  35    _ctl_; })
  36
  37 #define INTA    IRQ_IQ80321_INTA
  38 #define INTB    IRQ_IQ80321_INTB
  39 #define INTC    IRQ_IQ80321_INTC
  40 #define INTD    IRQ_IQ80321_INTD
  41
  42 #define INTE    IRQ_IQ80321_I82544
  43
  44 static inline int __init
  45 iq80321_map_irq(struct pci_dev *dev, u8 idsel, u8 pin)
  46 {
  47         static int pci_irq_table[][4] = {
  48                 /*
  49                  * PCI IDSEL/INTPIN->INTLINE
  50                  * A       B       C       D
  51                  */
  52                 {INTE, INTE, INTE, INTE}, /* Gig-E */
  53                 {-1, -1, -1, -1},         /* Unused */
  54                 {INTC, INTD, INTA, INTB}, /* PCI-X Slot */
  55                 {-1, -1, -1, -1},
  56         };
  57
  58         BUG_ON(pin < 1 || pin > 4);
  59
  60 //      return PCI_IRQ_TABLE_LOOKUP(4, 7);
  61         return pci_irq_table[idsel%4][pin-1];
  62 }
  63
  64 static struct hw_pci iq80321_pci __initdata = {
  65         .swizzle        = pci_std_swizzle,
  66         .nr_controllers = 1,
  67         .setup          = iop3xx_pci_setup,
  68         .scan           = iop3xx_pci_scan_bus,
  69         .preinit        = iop3xx_pci_preinit,
  70         .map_irq        = iq80321_map_irq
  71 };
  72
  73 static int __init iq80321_pci_init(void)
  74 {
  75         if (machine_is_iq80321())
  76                 pci_common_init(&iq80321_pci);
  77         return 0;
  78 }
  79
  80 subsys_initcall(iq80321_pci_init);
  81
  82
  83
  84