arch/arm/mach-iop3xx/iq80321-pci.c

   1 /*
   2  * arch/arm/mach-iop3xx/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 int iq80321_setup(int nr, struct pci_sys_data *sys)
  65 {
  66         struct resource *res;
  67
  68         if(nr != 0)
  69                 return 0;
  70
  71         res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
  72         if (!res)
  73                 panic("PCI: unable to alloc resources");
  74
  75         res[0].start = IOP321_PCI_LOWER_IO_VA;
  76         res[0].end   = IOP321_PCI_UPPER_IO_VA;
  77         res[0].name  = "IQ80321 PCI I/O Space";
  78         res[0].flags = IORESOURCE_IO;
  79
  80         res[1].start = IOP321_PCI_LOWER_MEM_PA;
  81         res[1].end   = IOP321_PCI_UPPER_MEM_PA;
  82         res[1].name  = "IQ80321 PCI Memory Space";
  83         res[1].flags = IORESOURCE_MEM;
  84
  85         request_resource(&ioport_resource, &res[0]);
  86         request_resource(&iomem_resource, &res[1]);
  87
  88         sys->mem_offset = IOP321_PCI_MEM_OFFSET;
  89         sys->io_offset  = IOP321_PCI_IO_OFFSET;
  90
  91         sys->resource[0] = &res[0];
  92         sys->resource[1] = &res[1];
  93         sys->resource[2] = NULL;
  94
  95         return 1;
  96 }
  97
  98 static void iq80321_preinit(void)
  99 {
 100         iop321_init();
 101 }
 102
 103 static struct hw_pci iq80321_pci __initdata = {
 104         .swizzle        = pci_std_swizzle,
 105         .nr_controllers = 1,
 106         .setup          = iq80321_setup,
 107         .scan           = iop321_scan_bus,
 108         .preinit        = iq80321_preinit,
 109         .map_irq        = iq80321_map_irq
 110 };
 111
 112 static int __init iq80321_pci_init(void)
 113 {
 114         if (machine_is_iq80321())
 115                 pci_common_init(&iq80321_pci);
 116         return 0;
 117 }
 118
 119 subsys_initcall(iq80321_pci_init);
 120
 121
 122
 123