arch/arm/mach-iop3xx/iq31244-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_IQ31244_INTA
  38 #define INTB    IRQ_IQ31244_INTB
  39 #define INTC    IRQ_IQ31244_INTC
  40 #define INTD    IRQ_IQ31244_INTD
  41
  42 #define INTE    IRQ_IQ31244_I82546
  43
  44 static inline int __init
  45 iq31244_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 #ifdef CONFIG_ARCH_EP80219
  53                 {INTB, INTB, INTB, INTB}, /* CFlash */
  54                 {INTE, INTE, INTE, INTE}, /* 82551 Pro 100 */
  55                 {INTD, INTD, INTD, INTD}, /* PCI-X Slot */
  56                 {INTC, INTC, INTC, INTC}, /* SATA   */
  57 #else
  58                 {INTB, INTB, INTB, INTB}, /* CFlash */
  59                 {INTC, INTC, INTC, INTC}, /* SATA   */
  60                 {INTD, INTD, INTD, INTD}, /* PCI-X Slot */
  61                 {INTE, INTE, INTE, INTE}, /* 82546 GigE */
  62 #endif // CONFIG_ARCH_EP80219
  63         };
  64
  65         BUG_ON(pin < 1 || pin > 4);
  66
  67         return PCI_IRQ_TABLE_LOOKUP(0, 7);
  68 }
  69
  70 static int iq31244_setup(int nr, struct pci_sys_data *sys)
  71 {
  72         struct resource *res;
  73
  74         if(nr != 0)
  75                 return 0;
  76
  77         res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
  78         if (!res)
  79                 panic("PCI: unable to alloc resources");
  80
  81         res[0].start = IOP321_PCI_LOWER_IO_VA;
  82         res[0].end   = IOP321_PCI_UPPER_IO_VA;
  83         res[0].name  = "IQ31244 PCI I/O Space";
  84         res[0].flags = IORESOURCE_IO;
  85
  86         res[1].start = IOP321_PCI_LOWER_MEM_PA;
  87         res[1].end   = IOP321_PCI_UPPER_MEM_PA;
  88         res[1].name  = "IQ31244 PCI Memory Space";
  89         res[1].flags = IORESOURCE_MEM;
  90
  91         request_resource(&ioport_resource, &res[0]);
  92         request_resource(&iomem_resource, &res[1]);
  93
  94         sys->mem_offset = IOP321_PCI_MEM_OFFSET;
  95         sys->io_offset  = IOP321_PCI_IO_OFFSET;
  96
  97         sys->resource[0] = &res[0];
  98         sys->resource[1] = &res[1];
  99         sys->resource[2] = NULL;
 100
 101         return 1;
 102 }
 103
 104 static void iq31244_preinit(void)
 105 {
 106         iop321_init();
 107 }
 108
 109 static struct hw_pci iq31244_pci __initdata = {
 110         .swizzle        = pci_std_swizzle,
 111         .nr_controllers = 1,
 112         .setup          = iq31244_setup,
 113         .scan           = iop321_scan_bus,
 114         .preinit        = iq31244_preinit,
 115         .map_irq        = iq31244_map_irq
 116 };
 117
 118 static int __init iq31244_pci_init(void)
 119 {
 120         if (machine_is_iq31244())
 121                 pci_common_init(&iq31244_pci);
 122         return 0;
 123 }
 124
 125 subsys_initcall(iq31244_pci_init);
 126
 127
 128
 129