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iq80331-pci.c

/*
 * arch/arm/mach-iop3xx/iq80331-pci.c
 *
 * PCI support for the Intel IQ80331 reference board
 *
 * Author: Dave Jiang <dave.jiang@intel.com>
 * Copyright (C) 2003, 2004 Intel Corp.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>

#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/mach/pci.h>
#include <asm/mach-types.h>

/*
 * The following macro is used to lookup irqs in a standard table
 * format for those systems that do not already have PCI
 * interrupts properly routed.  We assume 1 <= pin <= 4
 */
#define PCI_IRQ_TABLE_LOOKUP(minid,maxid) \
({ int _ctl_ = -1;                        \
   unsigned int _idsel = idsel - minid;         \
   if (_idsel <= maxid)                   \
      _ctl_ = pci_irq_table[_idsel][pin-1];     \
   _ctl_; })

#define INTA      IRQ_IQ80331_INTA
#define INTB      IRQ_IQ80331_INTB
#define INTC      IRQ_IQ80331_INTC
#define INTD      IRQ_IQ80331_INTD

//#define INTE    IRQ_IQ80331_I82544

static inline int __init
iq80331_map_irq(struct pci_dev *dev, u8 idsel, u8 pin)
{
      static int pci_irq_table[][4] = {
            /*
             * PCI IDSEL/INTPIN->INTLINE
             * A       B       C       D
             */
            {INTB, INTC, INTD, INTA}, /* PCI-X Slot */
            {INTC, INTC, INTC, INTC}, /* GigE  */
      };

      BUG_ON(pin < 1 || pin > 4);

      return PCI_IRQ_TABLE_LOOKUP(1, 7);
}

static int iq80331_setup(int nr, struct pci_sys_data *sys)
{
      struct resource *res;

      if(nr != 0)
            return 0;

      res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
      if (!res)
            panic("PCI: unable to alloc resources");

      res[0].start = IOP331_PCI_LOWER_IO_VA;
      res[0].end   = IOP331_PCI_UPPER_IO_VA;
      res[0].name  = "IQ80331 PCI I/O Space";
      res[0].flags = IORESOURCE_IO;

      res[1].start = IOP331_PCI_LOWER_MEM_PA;
      res[1].end   = IOP331_PCI_UPPER_MEM_PA;
      res[1].name  = "IQ80331 PCI Memory Space";
      res[1].flags = IORESOURCE_MEM;

      request_resource(&ioport_resource, &res[0]);
      request_resource(&iomem_resource, &res[1]);

      sys->mem_offset = IOP331_PCI_MEM_OFFSET;
      sys->io_offset  = IOP331_PCI_IO_OFFSET;

      sys->resource[0] = &res[0];
      sys->resource[1] = &res[1];
      sys->resource[2] = NULL;

      return 1;
}

static void iq80331_preinit(void)
{
      iop331_init();
}

static struct hw_pci iq80331_pci __initdata = {
      .swizzle    = pci_std_swizzle,
      .nr_controllers = 1,
      .setup            = iq80331_setup,
      .scan       = iop331_scan_bus,
      .preinit    = iq80331_preinit,
      .map_irq    = iq80331_map_irq
};

static int __init iq80331_pci_init(void)
{
      if (machine_is_iq80331())
            pci_common_init(&iq80331_pci);
      return 0;
}

subsys_initcall(iq80331_pci_init);





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