source: GPL/branches/uniaud32-next/lib32/pci.c@ 730

/* $Id: pci.c,v 1.1.1.1 2003/07/02 13:57:02 eleph Exp $ */
/*
 * OS/2 implementation of Linux PCI functions (using direct port I/O)
 *
 * (C) 2000-2002 InnoTek Systemberatung GmbH
 * (C) 2000-2001 Sander van Leeuwen (sandervl@xs4all.nl)
 * Copyright (c) 2016-2017 David Azarewicz <david@88watts.net>
 *
 * Parts based on Linux kernel sources
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
 * USA.
 *
 */
#define CONFIG_PM
#include "linux.h"
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/dma-mapping.h>
#include <linux/gfp.h>
#include <asm/uaccess.h>
#include <asm/hardirq.h>
#include <asm/io.h>
#include <sound/config.h>
#include <sound/core.h>
#include <sound/asound.h>

#define LINUX
#include <ossidc.h>
#include <stacktoflat.h>
#include <dbgos2.h>
#include <osspci.h>

#define MAX_PCI_BUSSES    256
#define MAX_PCI_DEVICES   16

struct pci_dev pci_devices[MAX_PCI_DEVICES] = {0};
//struct pci_bus pci_busses[MAX_PCI_BUSSES] = {0};

extern int nrCardsDetected;
extern int iAdapterNumber;


#define PCI_CONFIG_ENABLE   0x80000000
#define PCI_CONFIG_ADDRESS    0xCF8
#define PCI_CONFIG_DATA     0xCFC

//******************************************************************************
#define CONFIG_CMD(dev, where)  \
  (PCI_CONFIG_ENABLE | (dev->bus->number<<16) | (dev->devfn<<8) | (where & ~3))
//******************************************************************************
int pci_read_config_byte(struct pci_dev *dev, int where, u8 *value)
{
  outl(CONFIG_CMD(dev,where), PCI_CONFIG_ADDRESS);
  *value = inb(PCI_CONFIG_DATA + (where&3));
  return PCIBIOS_SUCCESSFUL;
}
//******************************************************************************
//******************************************************************************
int pci_read_config_word(struct pci_dev *dev, int where, u16 *value)
{
  outl(CONFIG_CMD(dev,where), PCI_CONFIG_ADDRESS);
  *value = inw(PCI_CONFIG_DATA + (where&2));
  return PCIBIOS_SUCCESSFUL;
}
//******************************************************************************
//******************************************************************************
int pci_read_config_dword(struct pci_dev *dev, int where, u32 *value)
{
  outl(CONFIG_CMD(dev,where), PCI_CONFIG_ADDRESS);
  *value = inl(PCI_CONFIG_DATA);
  return PCIBIOS_SUCCESSFUL;
}
//******************************************************************************
//******************************************************************************
int pci_write_config_byte(struct pci_dev *dev, int where, u8 value)
{
  outl(CONFIG_CMD(dev,where), PCI_CONFIG_ADDRESS);
  outb(value, PCI_CONFIG_DATA + (where&3));
  return PCIBIOS_SUCCESSFUL;
}
//******************************************************************************
//******************************************************************************
int pci_write_config_word(struct pci_dev *dev, int where, u16 value)
{
  outl(CONFIG_CMD(dev,where), PCI_CONFIG_ADDRESS);
  outw(value, PCI_CONFIG_DATA + (where&2));
  return PCIBIOS_SUCCESSFUL;
}
//******************************************************************************
//******************************************************************************
int pci_write_config_dword(struct pci_dev *dev, int where, u32 value)
{
  outl(CONFIG_CMD(dev,where), PCI_CONFIG_ADDRESS);
  outl(value, PCI_CONFIG_DATA);
  return PCIBIOS_SUCCESSFUL;
}
//******************************************************************************
//******************************************************************************
int pcidev_prepare(struct pci_dev *dev)
{
  dprintf(("pcidev_prepare %x not implemented", dev));
  return 1; //todo: correct return value??
}
//******************************************************************************
//******************************************************************************
int pcidev_activate(struct pci_dev *dev)
{
  dprintf(("pcidev_activate %x not implemented", dev));
  return 1; //todo: correct return value??
}
//******************************************************************************
//******************************************************************************
int pcidev_deactivate(struct pci_dev *dev)
{
  dprintf(("pcidev_deactivate %x not implemented", dev));
  return 1; //todo: correct return value??
}

/**
 * Called by: pci_find_device, register_driver
 *
 * Find the next matching PCI device starting with the device specified by ulLast
 * Returns: the found device, pcidev filled in. Returns zero if no device found.
 */
 static ULONG pci_query_device(const struct pci_device_id *pIdTable, struct pci_dev near *pcidev, ULONG ulLast)
{
  int resNo, addr;
  u32 devNr, busNr, funcNr, detectedId, cfgaddrreg, ulPciAdr, ulTmp1, ulTmp2;
  u8 headerType;

  busNr = (ulLast >> 8) & 0xff;
  devNr = PCI_SLOT(ulLast);
  funcNr = PCI_FUNC(ulLast);
  if (ulLast) funcNr++;

  cfgaddrreg = inl(PCI_CONFIG_ADDRESS);
  for ( ; busNr<MAX_PCI_BUSSES; busNr++) //BusNumber<255
  {
    for( ; devNr<32; devNr++)
    {
      for( ; funcNr<8; funcNr++)
      {
        headerType = 0;
        ulPciAdr = PCI_CONFIG_ENABLE | (busNr<<16) | (devNr<<11) | (funcNr<<8);
        outl(ulPciAdr, PCI_CONFIG_ADDRESS);
        detectedId = inl(PCI_CONFIG_DATA);

        if ( detectedId == 0xffffffff )
        {
          if ( funcNr == 0 ) break; /* if func 0 isn't there, the others aren't either */
          continue;
        }

        outl(ulPciAdr + PCI_CLASS_REVISION, PCI_CONFIG_ADDRESS);
        ulTmp2 = inl(PCI_CONFIG_DATA) >> 8; /* get class */

        //dprintf(("Found: %x Class=%x need: %x%x class=%x", detectedId, ulTmp2, pIdTable->device&0xffff, pIdTable->vendor, pIdTable->class));

        if ( pIdTable->class )
        {
          if ( (ulTmp2 & pIdTable->class_mask) != pIdTable->class ) continue;
        }

        if ( pIdTable->vendor && (pIdTable->vendor != (detectedId & 0xffff)) ) continue;
        if ( pIdTable->device && (pIdTable->device != PCI_ANY_ID) && (pIdTable->device != (detectedId >> 16)) ) continue;

        outl(ulPciAdr | (PCI_HEADER_TYPE & ~3), PCI_CONFIG_ADDRESS);
        headerType = inb(PCI_CONFIG_DATA + (PCI_HEADER_TYPE & 3));

        if ( (headerType & 0x7f) != PCI_HEADER_TYPE_NORMAL ) continue;

        memset((void near *)pcidev, 0, sizeof(struct pci_dev));

        pcidev->class = ulTmp2;
        pcidev->vendor = detectedId & 0xffff;
        pcidev->device = detectedId >> 16;
        //pcidev->bus = &pci_busses[busNr];
        pcidev->bus = kmalloc(sizeof(struct pci_bus), GFP_KERNEL);
        if (pcidev->bus == NULL) return 0;
        memset (pcidev->bus, 0, sizeof(struct pci_bus));
        pcidev->bus->number = busNr;
        pcidev->devfn = PCI_DEVFN(devNr, funcNr);
        pcidev->hdr_type = headerType & 0x7f;

        pcidev->prepare = pcidev_prepare;
        pcidev->activate = pcidev_activate;
        pcidev->deactivate = pcidev_deactivate;
        pcidev->active = 1;
        pcidev->ro = 0;
        pcidev->sibling = NULL;
        pcidev->next = NULL;
        pcidev->dma_mask = 0xffffffff;
        pcidev->dev.dma_mask = &pcidev->dma_mask;
        pcidev->dev.coherent_dma_mask = 0xffffffffull;
        INIT_LIST_HEAD(&pcidev->dev.devres_head);

        // Subsystem ID
        pci_read_config_word(pcidev, PCI_SUBSYSTEM_VENDOR_ID, &pcidev->subsystem_vendor);
        pci_read_config_word(pcidev, PCI_SUBSYSTEM_ID, &pcidev->subsystem_device);

        // revision
        pci_read_config_byte(pcidev, PCI_REVISION_ID, &pcidev->revision);

        // I/O  and MEM
        resNo = 0;
        for( addr = PCI_BASE_ADDRESS_0; addr <= PCI_BASE_ADDRESS_5; addr += 4 )
        {
          pci_read_config_dword(pcidev, addr, &ulTmp1);
          if( ulTmp1 != 0 && ulTmp1 != 0xffffffff )
          {
            pci_write_config_dword(pcidev, addr, 0xffffffff);
            pci_read_config_dword(pcidev, addr, &ulTmp2);
            pci_write_config_dword(pcidev, addr, ulTmp1);

            if( ulTmp1 & PCI_BASE_ADDRESS_SPACE_IO )
            {
              pcidev->resource[resNo].flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO;
              pcidev->resource[resNo].start = ulTmp1 & PCI_BASE_ADDRESS_IO_MASK;
              pcidev->resource[resNo].end   = pcidev->resource[resNo].start +
                ~(ulTmp2 & PCI_BASE_ADDRESS_IO_MASK) + 1;
            }
            else
            {
              pcidev->resource[resNo].flags = IORESOURCE_MEM | IORESOURCE_MEM_WRITEABLE;
              pcidev->resource[resNo].start = ulTmp1 & PCI_BASE_ADDRESS_MEM_MASK;
              pcidev->resource[resNo].end   = pcidev->resource[resNo].start +
                ~(ulTmp2 & PCI_BASE_ADDRESS_MEM_MASK) + 1;
            }

            resNo++;
          }
        }

        // IRQ and PIN
        pci_read_config_dword(pcidev, PCI_INTERRUPT_LINE, &ulTmp1);
        //rprintf(("pci_query_device: PCI config IRQ=%d", ulTmp1&0xff));
        if( (u8)ulTmp1 && (u8)ulTmp1 != 0xff )
        {
          pcidev->irq_resource[0].flags = IORESOURCE_IRQ;
          pcidev->irq_resource[0].start = pcidev->irq_resource[0].end   = ulTmp1 & 0xffff;
          pcidev->irq = (u8)ulTmp1; // This is the interrupt used for init time processing
          pcidev->irq_pin = ulTmp1>>8;
        }

        return ((busNr << 8) | PCI_DEVFN(devNr, funcNr));
      } /* for funcNr */
      funcNr = 0;
    } /* for devNr */
    devNr = 0;
  }
  outl(cfgaddrreg, PCI_CONFIG_ADDRESS);
  return 0;
}

/**
 * Called by: snd_pci_dev_present, various sound drivers
 *
 * Find the requested device
 */
struct pci_dev *pci_find_device (unsigned int vendor, unsigned int device, struct pci_dev *from)
{
  int i;
  struct pci_device_id id_table;

  for(i=0; i<MAX_PCI_DEVICES; i++)
  {
    if ( pci_devices[i].devfn && (pci_devices[i].vendor == vendor) && (pci_devices[i].device == device) ) return &pci_devices[i];
  }

  for(i=0; i<MAX_PCI_DEVICES; i++)
  {
    if(pci_devices[i].devfn == 0)
    {
      memset(&id_table, 0, sizeof(id_table));
      id_table.vendor = vendor;
      id_table.device = device;
      if( pci_query_device(&id_table, (struct pci_dev near *)&pci_devices[i], 0) ) return &pci_devices[i];
      else break;
    }
  }

  return NULL;
}

/** __request_region
 */
struct resource * __request_region(struct resource *a, unsigned long start, unsigned long n, const char *name)
{
  struct resource *resource;

  if(a->flags & IORESOURCE_MEM) {
    if(RMRequestMem(/*hResMgr,*/ start, n) == FALSE) {
      printk("RMRequestIO failed for mem %x length %x\n", start, n);
      return NULL;
    }
  }
  else if(a->flags & IORESOURCE_IO) {
    if(RMRequestIO(/*hResMgr,*/ start, n) == FALSE) {
      printk("RMRequestIO failed for io %x length %x\n", start, n);
      return NULL;
    }
  }

  resource = kmalloc(sizeof(struct resource), GFP_KERNEL);
  if (resource == NULL)
    return NULL;
  resource->name  = name;
  resource->start = start;
  resource->end   = start + n; // - 1;
  resource->flags = a->flags;
  resource->parent  =
    resource->child   = NULL;

  // insert in list
  resource->sibling = a->sibling;
  a->sibling = resource;

  return resource;
}

/**
 */
void __release_region(struct resource *a, unsigned long start, unsigned long n)
{
  struct resource *resource;
  struct resource **ppres = &a->sibling;
  unsigned long end = start + n; // - 1;

  while( *ppres )
  {
    resource = *ppres;

    if( resource->start == start && resource->end == end )
    {
      // remove from list
      *ppres = resource->sibling;
      kfree(resource);
      return;
    }

    ppres = &resource->sibling;
  }
}

/**
 */
int pci_get_flags (struct pci_dev *dev, int n_base)
{
  if(n_base >= DEVICE_COUNT_RESOURCE || !dev->resource[n_base].flags) {
    DebugInt3();
    return 0;
  }
  return dev->resource[n_base].flags;
}

/**
 */
int pcibios_present(void)
{
  printk("pcibios_present -> pretend BIOS present\n");
  return 1;
}

/**
 */
struct pci_dev *pci_find_slot (unsigned int bus, unsigned int devfn)
{
  printk("pci_find_slot %d %x not implemented!!\n", bus, devfn);
  DebugInt3();
  return NULL;
}

/**
 */
int pci_dma_supported(struct pci_dev *dev, unsigned long mask)
{
  printk("pci_dma_supported: return TRUE\n");
  return 1;
}

/**
 */
int pci_find_capability(struct pci_dev *dev, int cap)
{
  u16 status;
  u8 pos, id;
  int ttl = 48;

  pci_read_config_word(dev, PCI_STATUS, &status);
  if (!(status & PCI_STATUS_CAP_LIST))
    return 0;
  pci_read_config_byte(dev, PCI_CAPABILITY_LIST, &pos);
  while (ttl-- && pos >= 0x40) {
    pos &= ~3;
    pci_read_config_byte(dev, pos + PCI_CAP_LIST_ID, &id);
    if (id == 0xff)
      break;
    if (id == cap)
      return pos;
    pci_read_config_byte(dev, pos + PCI_CAP_LIST_NEXT, &pos);
  }
  return 0;
}

/**
 *  Set power management state of a device.  For transitions from state D3
 *  it isn't as straightforward as one could assume since many devices forget
 *  their configuration space during wakeup.  Returns old power state.
 */
int pci_set_power_state(struct pci_dev *dev, int new_state)
{
  u32 base[5], romaddr;
  u16 pci_command, pwr_command;
  u8  pci_latency, pci_cacheline;
  int i, old_state;
  int pm = pci_find_capability(dev, PCI_CAP_ID_PM);

  if (!pm)
    return 0;
  pci_read_config_word(dev, pm + PCI_PM_CTRL, &pwr_command);
  old_state = pwr_command & PCI_PM_CTRL_STATE_MASK;
  if (old_state == new_state)
    return old_state;
  if (old_state == 3) {
    pci_read_config_word(dev, PCI_COMMAND, &pci_command);
    pci_write_config_word(dev, PCI_COMMAND, pci_command & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY));
    for (i = 0; i < 5; i++)
      pci_read_config_dword(dev, PCI_BASE_ADDRESS_0 + i*4, &base[i]);
    pci_read_config_dword(dev, PCI_ROM_ADDRESS, &romaddr);
    pci_read_config_byte(dev, PCI_LATENCY_TIMER, &pci_latency);
    pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &pci_cacheline);
    pci_write_config_word(dev, pm + PCI_PM_CTRL, new_state);
    for (i = 0; i < 5; i++)
      pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + i*4, base[i]);
    pci_write_config_dword(dev, PCI_ROM_ADDRESS, romaddr);
    pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
    pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cacheline);
    pci_write_config_byte(dev, PCI_LATENCY_TIMER, pci_latency);
    pci_write_config_word(dev, PCI_COMMAND, pci_command);
  } else
    pci_write_config_word(dev, pm + PCI_PM_CTRL, (pwr_command & ~PCI_PM_CTRL_STATE_MASK) | new_state);
  return old_state;
}

/**
 * pcim_enable_device - Managed pci_enable_device()
 * @pdev: PCI device to be initialized
 *
 * Managed pci_enable_device().
 */
int pcim_enable_device(struct pci_dev *pdev)
{
        int rc;

        rc = pci_enable_device(pdev);
        return rc;
}

/**
 *  Initialize device before it's used by a driver. Ask low-level code
 *  to enable I/O and memory. Wake up the device if it was suspended.
 *  Beware, this function can fail.
 */
int pci_enable_device(struct pci_dev *dev)
{
  u16 pci_command;

  dprintf(("pci_enable_device %x\n", dev));

  pci_read_config_word(dev, PCI_COMMAND, &pci_command);
  pci_write_config_word(dev, PCI_COMMAND, pci_command | (PCI_COMMAND_IO | PCI_COMMAND_MEMORY));
  pci_set_power_state(dev, 0);
  return 0;
}

/** pci_register_driver
 *
 * probes and registers a sound driver with RM.
 *
 * Returns: number of cards found.
 */
int pci_register_driver(struct pci_driver *driver)
{
  int iNumCards, iTmp;
  ULONG ulLast;
  struct pci_dev *pcidev;
  struct pci_device_id IdTable;
  USHORT usVendor, usDevice;
  int iAdapter = 0;

  if (!driver->probe) return 0;

  iNumCards = 0;

  /* find an empty slot */
  for (iTmp=0; iTmp<MAX_PCI_DEVICES; iTmp++)
  {
    if (pci_devices[iTmp].devfn == 0) break;
  }
  if (iTmp >= MAX_PCI_DEVICES) return 0;
  pcidev = &pci_devices[iTmp];

  memset(&IdTable, 0, sizeof(IdTable));
  IdTable.class = 0x000400 << 8; /* Any multimedia device */
  IdTable.class_mask = 0xffff00 << 8;
  ulLast = 0;
  while( (ulLast = pci_query_device(&IdTable, pcidev, ulLast)) != 0 )
  {
    int iTableIx;

    rprintf((__func__": query_device found %x %04x:%04x class=%x checking %s",
      ulLast, pcidev->vendor, pcidev->device, pcidev->class, driver->name));

    usVendor = 0;
    usDevice = 0;

    for( iTableIx = 0; driver->id_table[iTableIx].vendor; iTableIx++)
    {
      struct pci_device_id const *pDriverId = &driver->id_table[iTableIx];

      if ( (pDriverId->class) && ((pcidev->class & pDriverId->class_mask) != pDriverId->class) ) continue;
      if (pDriverId->vendor != pcidev->vendor) continue;
      if ( (pDriverId->device != PCI_ANY_ID) && (pDriverId->device != pcidev->device) ) continue;

      /* skip a duplicate device that could be matched by both and exact match and a class match */
      if (usVendor == pcidev->vendor && usDevice == pcidev->device) continue;
      usVendor = pcidev->vendor;
      usDevice = pcidev->device;

      rprintf((__func__": matched %d %x:%x/%x with %x:%x/%x %x (%s)", iTableIx,
        pcidev->vendor, pcidev->device, pcidev->class,
        pDriverId->vendor, pDriverId->device, pDriverId->class, pDriverId->class_mask, driver->name));

      if ((iAdapterNumber >= 0) && (iAdapter < iAdapterNumber))
      {
        rprintf((__func__": AdapterNumber=%x skipping Adapter=%x", iAdapterNumber, iAdapter));
        iAdapter++;
        continue;
      }

      if (driver->probe(pcidev, pDriverId) == 0)
      {
        pcidev->pcidriver = (void *)driver;
        pcidev->current_state = 4;

        // create adapter
        RMCreateAdapterU32((pcidev->device << 16) | pcidev->vendor, &pcidev->hAdapter, ulLast, iNumCards);

        iNumCards++;
        pcidev = NULL; /* we need a new slot */
        break;
      }
      // release resources which were possibly allocated during probe() 
      RMDeallocRes();
    } /* for id_table loop */

    if (pcidev)
    {
      kfree(pcidev->bus);
      pcidev->devfn = 0;
    }
    else
    {
      if (iAdapterNumber >= 0) break;
      /* find another empty slot */
      for (iTmp=0; iTmp<MAX_PCI_DEVICES; iTmp++)
      {
        if (pci_devices[iTmp].devfn == 0) break;
      }
      if (iTmp >= MAX_PCI_DEVICES) break;
      pcidev = &pci_devices[iTmp];
    }
  } /* pci_query_device loop */

  return iNumCards;
}

/**
 */
int pci_module_init(struct pci_driver *drv)
{
  int res = pci_register_driver(drv);
  if (res == 0) return -ENODEV;
  return res;
}

/**
 */
int pci_unregister_driver(struct pci_driver *driver)
{
  struct pci_dev *pcidev;
  int i, j;

  for (i=0; driver->id_table[i].vendor; i++) {
    for(j=0; j<MAX_PCI_DEVICES; j++) {
      pcidev = &pci_devices[j];
      if (pcidev->devfn == 0) continue;
      if (pcidev->vendor != driver->id_table[i].vendor) continue;
      if ( (driver->id_table[i].device != PCI_ANY_ID) && (pcidev->device != driver->id_table[i].device) ) continue;
      dprintf(("pci unreg match: %x:%x %x:%x", pci_devices[j].vendor, pci_devices[j].device, driver->id_table[i].vendor, driver->id_table[i].device));
      if (driver->remove) driver->remove(pcidev);
      kfree(pcidev->bus);
      pcidev->devfn = 0;
    }
  }
  return 0;
}

/**
 */
void pci_set_master(struct pci_dev *dev)
{
  u16 cmd;

  pci_read_config_word(dev, PCI_COMMAND, &cmd);
  if (! (cmd & PCI_COMMAND_MASTER)) {
    dprintf(("pci_set_master %x", dev));
    cmd |= PCI_COMMAND_MASTER;
    pci_write_config_word(dev, PCI_COMMAND, cmd);
  }
  return;
}

/**
 * Register a device with power management
 */
struct pm_dev *pm_register(pm_dev_t type, unsigned long id,  pm_callback callback)
{
  dprintf(("pm_register STUB"));
  DebugInt3();
  return NULL;
}

/**
 * Unregister a device with power management
 */
void pm_unregister(struct pm_dev *dev)
{
  dprintf(("pm_unregister STUB"));
}

/**
 */
int __compat_get_order(unsigned long size)
{
  int order;

  size = (size-1) >> (PAGE_SHIFT-1);
  order = -1;
  do {
    size >>= 1;
    order++;
  } while (size);
  return order;
}

/**
 */
void *pci_alloc_consistent(struct pci_dev *hwdev,
               long size, dma_addr_t *dma_handle)
{
  void *ret = NULL;
  int gfp = GFP_ATOMIC;
  int order;
  dprintf(("pci_alloc_consistent %d mask %x", size, (hwdev) ? hwdev->dma_mask : 0));
  if (hwdev == NULL || hwdev->dma_mask != 0xffffffff) {
    //try not to exhaust low memory (< 16mb) so allocate from the high region first
    //if that doesn't satisfy the dma mask requirement, then get it from the low
    //region anyway
    if(hwdev->dma_mask > 0x00ffffff) {
      order = __compat_get_order(size);
      ret = (void *)__get_free_pages(gfp|GFP_DMAHIGHMEM, order);
      *dma_handle = virt_to_bus(ret);
      if(*dma_handle > hwdev->dma_mask) {
        free_pages((unsigned long)ret, __compat_get_order(size));
        //be sure and allocate below 16 mb
        gfp |= GFP_DMA;
        ret = NULL;
      }
    }
    else { //must always allocate below 16 mb
      gfp |= GFP_DMA;
    }
  }
  if(ret == NULL) {
    ret = (void *)__get_free_pages(gfp, __compat_get_order(size));
  }
  if (ret != NULL) {
    memset(ret, 0, size);
    *dma_handle = virt_to_bus(ret);
  }
  return ret;
}

#if 0
void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
                      dma_addr_t *dma_handle)
 {
         return dma_alloc_coherent(hwdev == NULL ? NULL : &hwdev->dev, size, dma_handle, GFP_ATOMIC);
 }
#endif
#if 0
void *dma_alloc_coherent(struct device *dev, size_t size,
                                dma_addr_t *dma_handle, gfp_t gfp)
{
  void *ret = NULL;
  int order;

  dprintf(("dma_alloc_coherent %d mask %x", size, (dev) ? dev->dma_mask : 0));
  if (dev == NULL || *dev->dma_mask != 0xffffffff) {
  dprintf(("dma_alloc_coherent"));
    //try not to exhaust low memory (< 16mb) so allocate from the high region first
    //if that doesn't satisfy the dma mask requirement, then get it from the low
    //region anyway
    if(*dev->dma_mask > 0x00ffffff) {
  dprintf(("dma_alloc_coherent2"));
      order = __compat_get_order(size);
      ret = (void *)__get_free_pages(gfp|GFP_DMAHIGHMEM, order);
      *dma_handle = virt_to_bus(ret);
      if(*dma_handle > *dev->dma_mask) {
  dprintf(("dma_alloc_coherent3"));
        free_pages((unsigned long)ret, __compat_get_order(size));
        //be sure and allocate below 16 mb
        gfp |= GFP_DMA;
        ret = NULL;
      }
  dprintf(("dma_alloc_coherent3a"));
    }
    else { //must always allocate below 16 mb
  dprintf(("dma_alloc_coherent4"));
      gfp |= GFP_DMA;
    }
  }
  if(ret == NULL) {
  dprintf(("dma_alloc_coherent5"));
    ret = (void *)__get_free_pages(gfp, __compat_get_order(size));
  }

  if (ret != NULL) {
    memset(ret, 0, size);
    *dma_handle = virt_to_bus(ret);
  }
  return ret;

}
#endif

int dma_supported(struct device *dev, u64 mask)
{
  return 1;
}

int dma_set_coherent_mask(struct device *dev, u64 mask)
{
        /*
         * Truncate the mask to the actually supported dma_addr_t width to
         * avoid generating unsupportable addresses.
         */
        mask = (dma_addr_t)mask;

        if (!dma_supported(dev, mask))
                return -EIO;

        dev->coherent_dma_mask = mask;
        return 0;
}

int dma_set_mask(struct device *dev, u64 mask)
{
        /*
         * Truncate the mask to the actually supported dma_addr_t width to
         * avoid generating unsupportable addresses.
         */
        mask = (dma_addr_t)mask;

        if (!dev->dma_mask || !dma_supported(dev, mask))
                return -EIO;

        *dev->dma_mask = mask;
        return 0;
}

/**
 */
void pci_free_consistent(struct pci_dev *hwdev, long size,
             void *vaddr, dma_addr_t dma_handle)
{
  free_pages((unsigned long)vaddr, __compat_get_order(size));
}


/**
 */
unsigned long pci_get_dma_mask (struct pci_dev *dev)
{
  if (dev)
    return dev->dma_mask;
  return 0;
}

/**
 */
int release_resource(struct resource *newres)
{
  return 0;
}

/**
 */
int pci_set_latency_time(struct pci_dev *dev, int latency)
{
  pci_write_config_byte(dev, PCI_LATENCY_TIMER, latency);
  return 0;
}

/**
 * pci_save_state - save the PCI configuration space of a device before suspending
 * @dev: - PCI device that we're dealing with
 * @buffer: - buffer to hold config space context
 *
 * @buffer must be large enough to hold the entire PCI 2.2 config space
 * (>= 64 bytes).
 */
int pci_orig_save_state(struct pci_dev *dev, u32 *buffer)
{
  int i;
  if (buffer) {
    /* XXX: 100% dword access ok here? */
    for (i = 0; i < 16; i++)
      pci_read_config_dword(dev, i * 4,&buffer[i]);
  }
  return 0;
}

/**
 * pci_restore_state - Restore the saved state of a PCI device
 * @dev: - PCI device that we're dealing with
 * @buffer: - saved PCI config space
 *
 */
int pci_orig_restore_state(struct pci_dev *dev, u32 *buffer)
{
  int i;

  if (buffer) {
    for (i = 0; i < 16; i++)
      pci_write_config_dword(dev,i * 4, buffer[i]);
  }
  /*
   * otherwise, write the context information we know from bootup.
   * This works around a problem where warm-booting from Windows
   * combined with a D3(hot)->D0 transition causes PCI config
   * header data to be forgotten.
   */
  else {
    for (i = 0; i < 6; i ++)
      pci_write_config_dword(dev,
                   PCI_BASE_ADDRESS_0 + (i * 4),
                   dev->resource[i].start);
    pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
  }
  return 0;
}

struct saved_config_tbl {
  struct pci_dev *pci;
  u32 config[16];
};
static struct saved_config_tbl saved_tbl[16];

int pci_save_state(struct pci_dev *pci)
{
  int i;
  /* FIXME: mutex needed for race? */
  for (i = 0; i < ARRAY_SIZE(saved_tbl); i++) {
    if (! saved_tbl[i].pci) {
      saved_tbl[i].pci = pci;
      pci_orig_save_state(pci, saved_tbl[i].config);
      return 1;
    }
  }
  printk(KERN_DEBUG "snd: no pci config space found!\n");
  return 0;
}

int pci_restore_state(struct pci_dev *pci)
{
  int i;
  /* FIXME: mutex needed for race? */
  for (i = 0; i < ARRAY_SIZE(saved_tbl); i++) {
    if (saved_tbl[i].pci == pci) {
      saved_tbl[i].pci = NULL;
      pci_orig_restore_state(pci, saved_tbl[i].config);
      return 0;
    }
  }
  printk(KERN_DEBUG "snd: no saved pci config!\n");
  return 1;
}

void pci_disable_device(struct pci_dev *dev)
{
  u16 pci_command;

  pci_read_config_word(dev, PCI_COMMAND, &pci_command);
  if (pci_command & PCI_COMMAND_MASTER) {
    pci_command &= ~PCI_COMMAND_MASTER;
    pci_write_config_word(dev, PCI_COMMAND, pci_command);
  }
}

int pci_request_region(struct pci_dev *pdev, int bar, char *res_name)
{
  int flags;

  if (pci_resource_len(pdev, bar) == 0)
    return 0;
  flags = pci_get_flags(pdev, bar);
  if (flags & IORESOURCE_IO) {
    if (check_region(pci_resource_start(pdev, bar), pci_resource_len(pdev, bar)))
      goto err_out;
    request_region(pci_resource_start(pdev, bar),
             pci_resource_len(pdev, bar), res_name);
  }
  else if (flags & IORESOURCE_MEM) {
    if (check_mem_region(pci_resource_start(pdev, bar), pci_resource_len(pdev, bar)))
      goto err_out;
    request_mem_region(pci_resource_start(pdev, bar),
               pci_resource_len(pdev, bar), res_name);
  }

  return 0;

err_out:
  printk(KERN_WARNING "PCI: Unable to reserve %s region #%d:%lx@%lx for device %s\n",
       flags & IORESOURCE_IO ? "I/O" : "mem",
       bar + 1, /* PCI BAR # */
       pci_resource_len(pdev, bar), pci_resource_start(pdev, bar),
       res_name);
  return -EBUSY;
}

void pci_release_region(struct pci_dev *pdev, int bar)
{
  int flags;

  if (pci_resource_len(pdev, bar) == 0)
    return;
  flags = pci_get_flags(pdev, bar);
  if (flags & IORESOURCE_IO) {
    release_region(pci_resource_start(pdev, bar),
             pci_resource_len(pdev, bar));
  }
  else if (flags & IORESOURCE_MEM) {
    release_mem_region(pci_resource_start(pdev, bar),
               pci_resource_len(pdev, bar));
  }
}

int pci_request_regions(struct pci_dev *pdev, char *res_name)
{
  int i;

  for (i = 0; i < 6; i++)
    if (pci_request_region(pdev, i, res_name))
      goto err;
  return 0;
  err:
    while (--i >= 0)
      pci_release_region(pdev, i);
    return -EBUSY;
}

void pci_release_regions(struct pci_dev *pdev)
{
  int i;
  for (i = 0; i < 6; i++)
    pci_release_region(pdev, i);
}

const struct pci_device_id * pci_match_id(const struct pci_device_id *ids, struct pci_dev *dev)
{
  u16 subsystem_vendor, subsystem_device;

  pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &subsystem_vendor);
  pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &subsystem_device);

  while (ids->vendor || ids->subvendor || ids->class_mask) {
    if ((ids->vendor == PCI_ANY_ID || ids->vendor == dev->vendor) &&
      (ids->device == PCI_ANY_ID || ids->device == dev->device) &&
      (ids->subvendor == PCI_ANY_ID || ids->subvendor == subsystem_vendor) &&
      (ids->subdevice == PCI_ANY_ID || ids->subdevice == subsystem_device) &&
      !((ids->class ^ dev->class) & ids->class_mask))
      return ids;
    ids++;
  }
  return NULL;
}

/** snd_pci_dev_present
 * Called by: various sound drivers
 */
int snd_pci_dev_present(const struct pci_device_id *ids)
{
  while (ids->vendor || ids->subvendor)
  {
    if (pci_find_device(ids->vendor, ids->subvendor, NULL)) return 1;
    ids++;
  }
  return 0;
}

//******************************************************************************
//******************************************************************************
OSSRET OSS32_APMResume()
{
  int i;
  struct pci_driver *driver;

  dprintf(("OSS32_APMResume"));

  for(i=0;i<MAX_PCI_DEVICES;i++)
  {
    if(pci_devices[i].devfn)
    {
      RMSetHandles(pci_devices[i].hAdapter); /* DAZ - dirty hack */
      driver = pci_devices[i].pcidriver;
      if(driver && driver->resume) {
        driver->resume(&pci_devices[i]);
      }
    }
  }

  return OSSERR_SUCCESS;
}
//******************************************************************************
//******************************************************************************
OSSRET OSS32_APMSuspend()
{
  int i;
  struct pci_driver *driver;

  dprintf(("OSS32_APMSuspend 1"));

  for(i=0;i<MAX_PCI_DEVICES;i++)
  {
    if(pci_devices[i].devfn)
    {
      RMSetHandles(pci_devices[i].hAdapter); /* DAZ - dirty hack */
      driver = pci_devices[i].pcidriver;
      if(driver && driver->suspend) {
        driver->suspend(&pci_devices[i], SNDRV_CTL_POWER_D3cold);
      }
    }
  }

  dprintf(("OSS32_APMSuspend 2"));
  return OSSERR_SUCCESS;
}

#ifdef USE_MSI
extern int __syscall UniMsiAlloc(USHORT usBusDevFunc, ULONG *pulCount, UCHAR *pucIrq);
int snd_pci_enable_msi(struct pci_dev *dev)
{
  ULONG p;
  UCHAR irq;

  if (dev->irq_pin)
  {
    p = 1; /* int count */
    if (UniMsiAlloc((dev->bus->number<<8) | dev->devfn, &p, &irq)) return -1;
    /* we have an msi interrupt */
    dev->irq = irq;
    dev->irq_pin = 0;
  }
  return 0;
}
#else
int snd_pci_enable_msi(struct pci_dev *dev)
{
  return -1;
}
#endif

/**
 * pci_status_get_and_clear_errors - return and clear error bits in PCI_STATUS
 * @pdev: the PCI device
 *
 * Returns error bits set in PCI_STATUS and clears them.
 */
int pci_status_get_and_clear_errors(struct pci_dev *pdev)
{
        u16 status;
        int ret;

        ret = pci_read_config_word(pdev, PCI_STATUS, &status);
        if (ret != PCIBIOS_SUCCESSFUL)
                return -EIO;

        status &= PCI_STATUS_ERROR_BITS;
        if (status)
                pci_write_config_word(pdev, PCI_STATUS, status);

        return status;
}

struct region_devres {
        struct resource *parent;
        resource_size_t start;
        resource_size_t n;
};

static void devm_region_release(struct device *dev, void *res)
{
        struct region_devres *this = res;

        __release_region(this->parent, this->start, this->n);
}

struct resource *
__devm_request_region(struct device *dev, struct resource *parent,
                      resource_size_t start, resource_size_t n, const char *name)
{
        struct region_devres *dr = NULL;
        struct resource *res;

        dr = devres_alloc(devm_region_release, sizeof(struct region_devres),
                          GFP_KERNEL);
        if (!dr)
                return NULL;

        dr->parent = parent;
        dr->start = start;
        dr->n = n;

        res = __request_region(parent, start, n, name);
        if (res)
                devres_add(dev, dr);
        else
                devres_free(dr);

        return res;
}
EXPORT_SYMBOL(__devm_request_region);