arch/arm/mach-iop3xx/iq80331-pci.c

   1 /*
   2  * arch/arm/mach-iop3xx/iq80331-pci.c
   3  *
   4  * PCI support for the Intel IQ80331 reference board
   5  *
   6  * Author: Dave Jiang <dave.jiang@intel.com>
   7  * Copyright (C) 2003, 2004 Intel Corp.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/kernel.h>
  14 #include <linux/pci.h>
  15 #include <linux/init.h>
  16 #include <linux/string.h>
  17 #include <linux/slab.h>
  18
  19 #include <asm/hardware.h>
  20 #include <asm/irq.h>
  21 #include <asm/mach/pci.h>
  22 #include <asm/mach-types.h>
  23
  24 /*
  25  * The following macro is used to lookup irqs in a standard table
  26  * format for those systems that do not already have PCI
  27  * interrupts properly routed.  We assume 1 <= pin <= 4
  28  */
  29 #define PCI_IRQ_TABLE_LOOKUP(minid,maxid)       \
  30 ({ int _ctl_ = -1;                              \
  31    unsigned int _idsel = idsel - minid;         \
  32    if (_idsel <= maxid)                         \
  33       _ctl_ = pci_irq_table[_idsel][pin-1];     \
  34    _ctl_; })
  35
  36 #define INTA    IRQ_IQ80331_INTA
  37 #define INTB    IRQ_IQ80331_INTB
  38 #define INTC    IRQ_IQ80331_INTC
  39 #define INTD    IRQ_IQ80331_INTD
  40
  41 //#define INTE  IRQ_IQ80331_I82544
  42
  43 static inline int __init
  44 iq80331_map_irq(struct pci_dev *dev, u8 idsel, u8 pin)
  45 {
  46         static int pci_irq_table[][4] = {
  47                 /*
  48                  * PCI IDSEL/INTPIN->INTLINE
  49                  * A       B       C       D
  50                  */
  51                 {INTB, INTC, INTD, INTA}, /* PCI-X Slot */
  52                 {INTC, INTC, INTC, INTC}, /* GigE  */
  53         };
  54
  55         BUG_ON(pin < 1 || pin > 4);
  56
  57         return PCI_IRQ_TABLE_LOOKUP(1, 7);
  58 }
  59
  60 static int iq80331_setup(int nr, struct pci_sys_data *sys)
  61 {
  62         struct resource *res;
  63
  64         if(nr != 0)
  65                 return 0;
  66
  67         res = kmalloc(sizeof(struct resource) * 2, GFP_KERNEL);
  68         if (!res)
  69                 panic("PCI: unable to alloc resources");
  70
  71         memset(res, 0, sizeof(struct resource) * 2);
  72
  73         res[0].start = IOP331_PCI_LOWER_IO_VA;
  74         res[0].end   = IOP331_PCI_UPPER_IO_VA;
  75         res[0].name  = "IQ80331 PCI I/O Space";
  76         res[0].flags = IORESOURCE_IO;
  77
  78         res[1].start = IOP331_PCI_LOWER_MEM_PA;
  79         res[1].end   = IOP331_PCI_UPPER_MEM_PA;
  80         res[1].name  = "IQ80331 PCI Memory Space";
  81         res[1].flags = IORESOURCE_MEM;
  82
  83         request_resource(&ioport_resource, &res[0]);
  84         request_resource(&iomem_resource, &res[1]);
  85
  86         sys->mem_offset = IOP331_PCI_MEM_OFFSET;
  87         sys->io_offset  = IOP331_PCI_IO_OFFSET;
  88
  89         sys->resource[0] = &res[0];
  90         sys->resource[1] = &res[1];
  91         sys->resource[2] = NULL;
  92
  93         return 1;
  94 }
  95
  96 static void iq80331_preinit(void)
  97 {
  98         iop331_init();
  99 }
 100
 101 static struct hw_pci iq80331_pci __initdata = {
 102         .swizzle        = pci_std_swizzle,
 103         .nr_controllers = 1,
 104         .setup          = iq80331_setup,
 105         .scan           = iop331_scan_bus,
 106         .preinit        = iq80331_preinit,
 107         .map_irq        = iq80331_map_irq
 108 };
 109
 110 static int __init iq80331_pci_init(void)
 111 {
 112         if (machine_is_iq80331())
 113                 pci_common_init(&iq80331_pci);
 114         return 0;
 115 }
 116
 117 subsys_initcall(iq80331_pci_init);
 118
 119
 120
 121