ARM: bcmring: remove unused DMA map code

index 1a1a27d..1024396 100644
@@ -33,17 +33,11 @@
 
 #include <mach/timer.h>
 
-#include <linux/mm.h>
 #include <linux/pfn.h>
 #include <linux/atomic.h>
 #include <linux/sched.h>
 #include <mach/dma.h>
 
-/* I don't quite understand why dc4 fails when this is set to 1 and DMA is enabled */
-/* especially since dc4 doesn't use kmalloc'd memory. */
-
-#define ALLOW_MAP_OF_KMALLOC_MEMORY 0
-
 /* ---- Public Variables ------------------------------------------------- */
 
 /* ---- Private Constants and Types -------------------------------------- */

@@ -53,24 +47,12 @@
 #define CONTROLLER_FROM_HANDLE(handle)    (((handle) >> 4) & 0x0f)
 #define CHANNEL_FROM_HANDLE(handle)       ((handle) & 0x0f)
 
-#define DMA_MAP_DEBUG   0
-
-#if DMA_MAP_DEBUG
-#   define  DMA_MAP_PRINT(fmt, args...)   printk("%s: " fmt, __func__,  ## args)
-#else
-#   define  DMA_MAP_PRINT(fmt, args...)
-#endif
 
 /* ---- Private Variables ------------------------------------------------ */
 
 static DMA_Global_t gDMA;
 static struct proc_dir_entry *gDmaDir;
 
-static atomic_t gDmaStatMemTypeKmalloc = ATOMIC_INIT(0);
-static atomic_t gDmaStatMemTypeVmalloc = ATOMIC_INIT(0);
-static atomic_t gDmaStatMemTypeUser = ATOMIC_INIT(0);
-static atomic_t gDmaStatMemTypeCoherent = ATOMIC_INIT(0);
-
 #include "dma_device.c"
 
 /* ---- Private Function Prototypes -------------------------------------- */

@@ -79,34 +61,6 @@ static atomic_t gDmaStatMemTypeCoherent = ATOMIC_INIT(0);
 
 /****************************************************************************/
 /**
-*   Displays information for /proc/dma/mem-type
-*/
-/****************************************************************************/
-
-static int dma_proc_read_mem_type(char *buf, char **start, off_t offset,
-                                 int count, int *eof, void *data)
-{
-       int len = 0;
-
-       len += sprintf(buf + len, "dma_map_mem statistics\n");
-       len +=
-           sprintf(buf + len, "coherent: %d\n",
-                   atomic_read(&gDmaStatMemTypeCoherent));
-       len +=
-           sprintf(buf + len, "kmalloc:  %d\n",
-                   atomic_read(&gDmaStatMemTypeKmalloc));
-       len +=
-           sprintf(buf + len, "vmalloc:  %d\n",
-                   atomic_read(&gDmaStatMemTypeVmalloc));
-       len +=
-           sprintf(buf + len, "user:     %d\n",
-                   atomic_read(&gDmaStatMemTypeUser));
-
-       return len;
-}
-
-/****************************************************************************/
-/**
 *   Displays information for /proc/dma/channels
 */
 /****************************************************************************/

@@ -846,8 +800,6 @@ int dma_init(void)
                                       dma_proc_read_channels, NULL);
                create_proc_read_entry("devices", 0, gDmaDir,
                                       dma_proc_read_devices, NULL);
-               create_proc_read_entry("mem-type", 0, gDmaDir,
-                                      dma_proc_read_mem_type, NULL);
        }
 
 out:

@@ -1565,767 +1517,3 @@ int dma_set_device_handler(DMA_Device_t dev,    /* Device to set the callback for.
 }
 
 EXPORT_SYMBOL(dma_set_device_handler);
-
-/****************************************************************************/
-/**
-*   Initializes a memory mapping structure
-*/
-/****************************************************************************/
-
-int dma_init_mem_map(DMA_MemMap_t *memMap)
-{
-       memset(memMap, 0, sizeof(*memMap));
-
-       sema_init(&memMap->lock, 1);
-
-       return 0;
-}
-
-EXPORT_SYMBOL(dma_init_mem_map);
-
-/****************************************************************************/
-/**
-*   Releases any memory currently being held by a memory mapping structure.
-*/
-/****************************************************************************/
-
-int dma_term_mem_map(DMA_MemMap_t *memMap)
-{
-       down(&memMap->lock);    /* Just being paranoid */
-
-       /* Free up any allocated memory */
-
-       up(&memMap->lock);
-       memset(memMap, 0, sizeof(*memMap));
-
-       return 0;
-}
-
-EXPORT_SYMBOL(dma_term_mem_map);
-
-/****************************************************************************/
-/**
-*   Looks at a memory address and categorizes it.
-*
-*   @return One of the values from the DMA_MemType_t enumeration.
-*/
-/****************************************************************************/
-
-DMA_MemType_t dma_mem_type(void *addr)
-{
-       unsigned long addrVal = (unsigned long)addr;
-
-       if (addrVal >= CONSISTENT_BASE) {
-               /* NOTE: DMA virtual memory space starts at 0xFFxxxxxx */
-
-               /* dma_alloc_xxx pages are physically and virtually contiguous */
-
-               return DMA_MEM_TYPE_DMA;
-       }
-
-       /* Technically, we could add one more classification. Addresses between VMALLOC_END */
-       /* and the beginning of the DMA virtual address could be considered to be I/O space. */
-       /* Right now, nobody cares about this particular classification, so we ignore it. */
-
-       if (is_vmalloc_addr(addr)) {
-               /* Address comes from the vmalloc'd region. Pages are virtually */
-               /* contiguous but NOT physically contiguous */
-
-               return DMA_MEM_TYPE_VMALLOC;
-       }
-
-       if (addrVal >= PAGE_OFFSET) {
-               /* PAGE_OFFSET is typically 0xC0000000 */
-
-               /* kmalloc'd pages are physically contiguous */
-
-               return DMA_MEM_TYPE_KMALLOC;
-       }
-
-       return DMA_MEM_TYPE_USER;
-}
-
-EXPORT_SYMBOL(dma_mem_type);
-
-/****************************************************************************/
-/**
-*   Looks at a memory address and determines if we support DMA'ing to/from
-*   that type of memory.
-*
-*   @return boolean -
-*               return value != 0 means dma supported
-*               return value == 0 means dma not supported
-*/
-/****************************************************************************/
-
-int dma_mem_supports_dma(void *addr)
-{
-       DMA_MemType_t memType = dma_mem_type(addr);
-
-       return (memType == DMA_MEM_TYPE_DMA)
-#if ALLOW_MAP_OF_KMALLOC_MEMORY
-           || (memType == DMA_MEM_TYPE_KMALLOC)
-#endif
-           || (memType == DMA_MEM_TYPE_USER);
-}
-
-EXPORT_SYMBOL(dma_mem_supports_dma);
-
-/****************************************************************************/
-/**
-*   Maps in a memory region such that it can be used for performing a DMA.
-*
-*   @return
-*/
-/****************************************************************************/
-
-int dma_map_start(DMA_MemMap_t *memMap,        /* Stores state information about the map */
-                 enum dma_data_direction dir   /* Direction that the mapping will be going */
-    ) {
-       int rc;
-
-       down(&memMap->lock);
-
-       DMA_MAP_PRINT("memMap: %p\n", memMap);
-
-       if (memMap->inUse) {
-               printk(KERN_ERR "%s: memory map %p is already being used\n",
-                      __func__, memMap);
-               rc = -EBUSY;
-               goto out;
-       }
-
-       memMap->inUse = 1;
-       memMap->dir = dir;
-       memMap->numRegionsUsed = 0;
-
-       rc = 0;
-
-out:
-
-       DMA_MAP_PRINT("returning %d", rc);
-
-       up(&memMap->lock);
-
-       return rc;
-}
-
-EXPORT_SYMBOL(dma_map_start);
-
-/****************************************************************************/
-/**
-*   Adds a segment of memory to a memory map. Each segment is both
-*   physically and virtually contiguous.
-*
-*   @return     0 on success, error code otherwise.
-*/
-/****************************************************************************/
-
-static int dma_map_add_segment(DMA_MemMap_t *memMap,   /* Stores state information about the map */
-                              DMA_Region_t *region,    /* Region that the segment belongs to */
-                              void *virtAddr,  /* Virtual address of the segment being added */
-                              dma_addr_t physAddr,     /* Physical address of the segment being added */
-                              size_t numBytes  /* Number of bytes of the segment being added */
-    ) {
-       DMA_Segment_t *segment;
-
-       DMA_MAP_PRINT("memMap:%p va:%p pa:0x%x #:%d\n", memMap, virtAddr,
-                     physAddr, numBytes);
-
-       /* Sanity check */
-
-       if (((unsigned long)virtAddr < (unsigned long)region->virtAddr)
-           || (((unsigned long)virtAddr + numBytes)) >
-           ((unsigned long)region->virtAddr + region->numBytes)) {
-               printk(KERN_ERR
-                      "%s: virtAddr %p is outside region @ %p len: %d\n",
-                      __func__, virtAddr, region->virtAddr, region->numBytes);
-               return -EINVAL;
-       }
-
-       if (region->numSegmentsUsed > 0) {
-               /* Check to see if this segment is physically contiguous with the previous one */
-
-               segment = &region->segment[region->numSegmentsUsed - 1];
-
-               if ((segment->physAddr + segment->numBytes) == physAddr) {
-                       /* It is - just add on to the end */
-
-                       DMA_MAP_PRINT("appending %d bytes to last segment\n",
-                                     numBytes);
-
-                       segment->numBytes += numBytes;
-
-                       return 0;
-               }
-       }
-
-       /* Reallocate to hold more segments, if required. */
-
-       if (region->numSegmentsUsed >= region->numSegmentsAllocated) {
-               DMA_Segment_t *newSegment;
-               size_t oldSize =
-                   region->numSegmentsAllocated * sizeof(*newSegment);
-               int newAlloc = region->numSegmentsAllocated + 4;
-               size_t newSize = newAlloc * sizeof(*newSegment);
-
-               newSegment = kmalloc(newSize, GFP_KERNEL);
-               if (newSegment == NULL) {
-                       return -ENOMEM;
-               }
-               memcpy(newSegment, region->segment, oldSize);
-               memset(&((uint8_t *) newSegment)[oldSize], 0,
-                      newSize - oldSize);
-               kfree(region->segment);
-
-               region->numSegmentsAllocated = newAlloc;
-               region->segment = newSegment;
-       }
-
-       segment = &region->segment[region->numSegmentsUsed];
-       region->numSegmentsUsed++;
-
-       segment->virtAddr = virtAddr;
-       segment->physAddr = physAddr;
-       segment->numBytes = numBytes;
-
-       DMA_MAP_PRINT("returning success\n");
-
-       return 0;
-}
-
-/****************************************************************************/
-/**
-*   Adds a region of memory to a memory map. Each region is virtually
-*   contiguous, but not necessarily physically contiguous.
-*
-*   @return     0 on success, error code otherwise.
-*/
-/****************************************************************************/
-
-int dma_map_add_region(DMA_MemMap_t *memMap,   /* Stores state information about the map */
-                      void *mem,       /* Virtual address that we want to get a map of */
-                      size_t numBytes  /* Number of bytes being mapped */
-    ) {
-       unsigned long addr = (unsigned long)mem;
-       unsigned int offset;
-       int rc = 0;
-       DMA_Region_t *region;
-       dma_addr_t physAddr;
-
-       down(&memMap->lock);
-
-       DMA_MAP_PRINT("memMap:%p va:%p #:%d\n", memMap, mem, numBytes);
-
-       if (!memMap->inUse) {
-               printk(KERN_ERR "%s: Make sure you call dma_map_start first\n",
-                      __func__);
-               rc = -EINVAL;
-               goto out;
-       }
-
-       /* Reallocate to hold more regions. */
-
-       if (memMap->numRegionsUsed >= memMap->numRegionsAllocated) {
-               DMA_Region_t *newRegion;
-               size_t oldSize =
-                   memMap->numRegionsAllocated * sizeof(*newRegion);
-               int newAlloc = memMap->numRegionsAllocated + 4;
-               size_t newSize = newAlloc * sizeof(*newRegion);
-
-               newRegion = kmalloc(newSize, GFP_KERNEL);
-               if (newRegion == NULL) {
-                       rc = -ENOMEM;
-                       goto out;
-               }
-               memcpy(newRegion, memMap->region, oldSize);
-               memset(&((uint8_t *) newRegion)[oldSize], 0, newSize - oldSize);
-
-               kfree(memMap->region);
-
-               memMap->numRegionsAllocated = newAlloc;
-               memMap->region = newRegion;
-       }
-
-       region = &memMap->region[memMap->numRegionsUsed];
-       memMap->numRegionsUsed++;
-
-       offset = addr & ~PAGE_MASK;
-
-       region->memType = dma_mem_type(mem);
-       region->virtAddr = mem;
-       region->numBytes = numBytes;
-       region->numSegmentsUsed = 0;
-       region->numLockedPages = 0;
-       region->lockedPages = NULL;
-
-       switch (region->memType) {
-       case DMA_MEM_TYPE_VMALLOC:
-               {
-                       atomic_inc(&gDmaStatMemTypeVmalloc);
-
-                       /* printk(KERN_ERR "%s: vmalloc'd pages are not supported\n", __func__); */
-
-                       /* vmalloc'd pages are not physically contiguous */
-
-                       rc = -EINVAL;
-                       break;
-               }
-
-       case DMA_MEM_TYPE_KMALLOC:
-               {
-                       atomic_inc(&gDmaStatMemTypeKmalloc);
-
-                       /* kmalloc'd pages are physically contiguous, so they'll have exactly */
-                       /* one segment */
-
-#if ALLOW_MAP_OF_KMALLOC_MEMORY
-                       physAddr =
-                           dma_map_single(NULL, mem, numBytes, memMap->dir);
-                       rc = dma_map_add_segment(memMap, region, mem, physAddr,
-                                                numBytes);
-#else
-                       rc = -EINVAL;
-#endif
-                       break;
-               }
-
-       case DMA_MEM_TYPE_DMA:
-               {
-                       /* dma_alloc_xxx pages are physically contiguous */
-
-                       atomic_inc(&gDmaStatMemTypeCoherent);
-
-                       physAddr = (vmalloc_to_pfn(mem) << PAGE_SHIFT) + offset;
-
-                       dma_sync_single_for_cpu(NULL, physAddr, numBytes,
-                                               memMap->dir);
-                       rc = dma_map_add_segment(memMap, region, mem, physAddr,
-                                                numBytes);
-                       break;
-               }
-
-       case DMA_MEM_TYPE_USER:
-               {
-                       size_t firstPageOffset;
-                       size_t firstPageSize;
-                       struct page **pages;
-                       struct task_struct *userTask;
-
-                       atomic_inc(&gDmaStatMemTypeUser);
-
-#if 1
-                       /* If the pages are user pages, then the dma_mem_map_set_user_task function */
-                       /* must have been previously called. */
-
-                       if (memMap->userTask == NULL) {
-                               printk(KERN_ERR
-                                      "%s: must call dma_mem_map_set_user_task when using user-mode memory\n",
-                                      __func__);
-                               return -EINVAL;
-                       }
-
-                       /* User pages need to be locked. */
-
-                       firstPageOffset =
-                           (unsigned long)region->virtAddr & (PAGE_SIZE - 1);
-                       firstPageSize = PAGE_SIZE - firstPageOffset;
-
-                       region->numLockedPages = (firstPageOffset
-                                                 + region->numBytes +
-                                                 PAGE_SIZE - 1) / PAGE_SIZE;
-                       pages =
-                           kmalloc(region->numLockedPages *
-                                   sizeof(struct page *), GFP_KERNEL);
-
-                       if (pages == NULL) {
-                               region->numLockedPages = 0;
-                               return -ENOMEM;
-                       }
-
-                       userTask = memMap->userTask;
-
-                       down_read(&userTask->mm->mmap_sem);
-                       rc = get_user_pages(userTask,   /* task */
-                                           userTask->mm,       /* mm */
-                                           (unsigned long)region->virtAddr,    /* start */
-                                           region->numLockedPages,     /* len */
-                                           memMap->dir == DMA_FROM_DEVICE,     /* write */
-                                           0,  /* force */
-                                           pages,      /* pages (array of pointers to page) */
-                                           NULL);      /* vmas */
-                       up_read(&userTask->mm->mmap_sem);
-
-                       if (rc != region->numLockedPages) {
-                               kfree(pages);
-                               region->numLockedPages = 0;
-
-                               if (rc >= 0) {
-                                       rc = -EINVAL;
-                               }
-                       } else {
-                               uint8_t *virtAddr = region->virtAddr;
-                               size_t bytesRemaining;
-                               int pageIdx;
-
-                               rc = 0; /* Since get_user_pages returns +ve number */
-
-                               region->lockedPages = pages;
-
-                               /* We've locked the user pages. Now we need to walk them and figure */
-                               /* out the physical addresses. */
-
-                               /* The first page may be partial */
-
-                               dma_map_add_segment(memMap,
-                                                   region,
-                                                   virtAddr,
-                                                   PFN_PHYS(page_to_pfn
-                                                            (pages[0])) +
-                                                   firstPageOffset,
-                                                   firstPageSize);
-
-                               virtAddr += firstPageSize;
-                               bytesRemaining =
-                                   region->numBytes - firstPageSize;
-
-                               for (pageIdx = 1;
-                                    pageIdx < region->numLockedPages;
-                                    pageIdx++) {
-                                       size_t bytesThisPage =
-                                           (bytesRemaining >
-                                            PAGE_SIZE ? PAGE_SIZE :
-                                            bytesRemaining);
-
-                                       DMA_MAP_PRINT
-                                           ("pageIdx:%d pages[pageIdx]=%p pfn=%u phys=%u\n",
-                                            pageIdx, pages[pageIdx],
-                                            page_to_pfn(pages[pageIdx]),
-                                            PFN_PHYS(page_to_pfn
-                                                     (pages[pageIdx])));
-
-                                       dma_map_add_segment(memMap,
-                                                           region,
-                                                           virtAddr,
-                                                           PFN_PHYS(page_to_pfn
-                                                                    (pages
-                                                                     [pageIdx])),
-                                                           bytesThisPage);
-
-                                       virtAddr += bytesThisPage;
-                                       bytesRemaining -= bytesThisPage;
-                               }
-                       }
-#else
-                       printk(KERN_ERR
-                              "%s: User mode pages are not yet supported\n",
-                              __func__);
-
-                       /* user pages are not physically contiguous */
-
-                       rc = -EINVAL;
-#endif
-                       break;
-               }
-
-       default:
-               {
-                       printk(KERN_ERR "%s: Unsupported memory type: %d\n",
-                              __func__, region->memType);
-
-                       rc = -EINVAL;
-                       break;
-               }
-       }
-
-       if (rc != 0) {
-               memMap->numRegionsUsed--;
-       }
-
-out:
-
-       DMA_MAP_PRINT("returning %d\n", rc);
-
-       up(&memMap->lock);
-
-       return rc;
-}
-
-EXPORT_SYMBOL(dma_map_add_segment);
-
-/****************************************************************************/
-/**
-*   Maps in a memory region such that it can be used for performing a DMA.
-*
-*   @return     0 on success, error code otherwise.
-*/
-/****************************************************************************/
-
-int dma_map_mem(DMA_MemMap_t *memMap,  /* Stores state information about the map */
-               void *mem,      /* Virtual address that we want to get a map of */
-               size_t numBytes,        /* Number of bytes being mapped */
-               enum dma_data_direction dir     /* Direction that the mapping will be going */
-    ) {
-       int rc;
-
-       rc = dma_map_start(memMap, dir);
-       if (rc == 0) {
-               rc = dma_map_add_region(memMap, mem, numBytes);
-               if (rc < 0) {
-                       /* Since the add fails, this function will fail, and the caller won't */
-                       /* call unmap, so we need to do it here. */
-
-                       dma_unmap(memMap, 0);
-               }
-       }
-
-       return rc;
-}
-
-EXPORT_SYMBOL(dma_map_mem);
-
-/****************************************************************************/
-/**
-*   Setup a descriptor ring for a given memory map.
-*
-*   It is assumed that the descriptor ring has already been initialized, and
-*   this routine will only reallocate a new descriptor ring if the existing
-*   one is too small.
-*
-*   @return     0 on success, error code otherwise.
-*/
-/****************************************************************************/
-
-int dma_map_create_descriptor_ring(DMA_Device_t dev,   /* DMA device (where the ring is stored) */
-                                  DMA_MemMap_t *memMap,        /* Memory map that will be used */
-                                  dma_addr_t devPhysAddr       /* Physical address of device */
-    ) {
-       int rc;
-       int numDescriptors;
-       DMA_DeviceAttribute_t *devAttr;
-       DMA_Region_t *region;
-       DMA_Segment_t *segment;
-       dma_addr_t srcPhysAddr;
-       dma_addr_t dstPhysAddr;
-       int regionIdx;
-       int segmentIdx;
-
-       devAttr = &DMA_gDeviceAttribute[dev];
-
-       down(&memMap->lock);
-
-       /* Figure out how many descriptors we need */
-
-       numDescriptors = 0;
-       for (regionIdx = 0; regionIdx < memMap->numRegionsUsed; regionIdx++) {
-               region = &memMap->region[regionIdx];
-
-               for (segmentIdx = 0; segmentIdx < region->numSegmentsUsed;
-                    segmentIdx++) {
-                       segment = &region->segment[segmentIdx];
-
-                       if (memMap->dir == DMA_TO_DEVICE) {
-                               srcPhysAddr = segment->physAddr;
-                               dstPhysAddr = devPhysAddr;
-                       } else {
-                               srcPhysAddr = devPhysAddr;
-                               dstPhysAddr = segment->physAddr;
-                       }
-
-                       rc =
-                            dma_calculate_descriptor_count(dev, srcPhysAddr,
-                                                           dstPhysAddr,
-                                                           segment->
-                                                           numBytes);
-                       if (rc < 0) {
-                               printk(KERN_ERR
-                                      "%s: dma_calculate_descriptor_count failed: %d\n",
-                                      __func__, rc);
-                               goto out;
-                       }
-                       numDescriptors += rc;
-               }
-       }
-
-       /* Adjust the size of the ring, if it isn't big enough */
-
-       if (numDescriptors > devAttr->ring.descriptorsAllocated) {
-               dma_free_descriptor_ring(&devAttr->ring);
-               rc =
-                    dma_alloc_descriptor_ring(&devAttr->ring,
-                                              numDescriptors);
-               if (rc < 0) {
-                       printk(KERN_ERR
-                              "%s: dma_alloc_descriptor_ring failed: %d\n",
-                              __func__, rc);
-                       goto out;
-               }
-       } else {
-               rc =
-                    dma_init_descriptor_ring(&devAttr->ring,
-                                             numDescriptors);
-               if (rc < 0) {
-                       printk(KERN_ERR
-                              "%s: dma_init_descriptor_ring failed: %d\n",
-                              __func__, rc);
-                       goto out;
-               }
-       }
-
-       /* Populate the descriptors */
-
-       for (regionIdx = 0; regionIdx < memMap->numRegionsUsed; regionIdx++) {
-               region = &memMap->region[regionIdx];
-
-               for (segmentIdx = 0; segmentIdx < region->numSegmentsUsed;
-                    segmentIdx++) {
-                       segment = &region->segment[segmentIdx];
-
-                       if (memMap->dir == DMA_TO_DEVICE) {
-                               srcPhysAddr = segment->physAddr;
-                               dstPhysAddr = devPhysAddr;
-                       } else {
-                               srcPhysAddr = devPhysAddr;
-                               dstPhysAddr = segment->physAddr;
-                       }
-
-                       rc =
-                            dma_add_descriptors(&devAttr->ring, dev,
-                                                srcPhysAddr, dstPhysAddr,
-                                                segment->numBytes);
-                       if (rc < 0) {
-                               printk(KERN_ERR
-                                      "%s: dma_add_descriptors failed: %d\n",
-                                      __func__, rc);
-                               goto out;
-                       }
-               }
-       }
-
-       rc = 0;
-
-out:
-
-       up(&memMap->lock);
-       return rc;
-}
-
-EXPORT_SYMBOL(dma_map_create_descriptor_ring);
-
-/****************************************************************************/
-/**
-*   Maps in a memory region such that it can be used for performing a DMA.
-*
-*   @return
-*/
-/****************************************************************************/
-
-int dma_unmap(DMA_MemMap_t *memMap,    /* Stores state information about the map */
-             int dirtied       /* non-zero if any of the pages were modified */
-    ) {
-
-       int rc = 0;
-       int regionIdx;
-       int segmentIdx;
-       DMA_Region_t *region;
-       DMA_Segment_t *segment;
-
-       down(&memMap->lock);
-
-       for (regionIdx = 0; regionIdx < memMap->numRegionsUsed; regionIdx++) {
-               region = &memMap->region[regionIdx];
-
-               for (segmentIdx = 0; segmentIdx < region->numSegmentsUsed;
-                    segmentIdx++) {
-                       segment = &region->segment[segmentIdx];
-
-                       switch (region->memType) {
-                       case DMA_MEM_TYPE_VMALLOC:
-                               {
-                                       printk(KERN_ERR
-                                              "%s: vmalloc'd pages are not yet supported\n",
-                                              __func__);
-                                       rc = -EINVAL;
-                                       goto out;
-                               }
-
-                       case DMA_MEM_TYPE_KMALLOC:
-                               {
-#if ALLOW_MAP_OF_KMALLOC_MEMORY
-                                       dma_unmap_single(NULL,
-                                                        segment->physAddr,
-                                                        segment->numBytes,
-                                                        memMap->dir);
-#endif
-                                       break;
-                               }
-
-                       case DMA_MEM_TYPE_DMA:
-                               {
-                                       dma_sync_single_for_cpu(NULL,
-                                                               segment->
-                                                               physAddr,
-                                                               segment->
-                                                               numBytes,
-                                                               memMap->dir);
-                                       break;
-                               }
-
-                       case DMA_MEM_TYPE_USER:
-                               {
-                                       /* Nothing to do here. */
-
-                                       break;
-                               }
-
-                       default:
-                               {
-                                       printk(KERN_ERR
-                                              "%s: Unsupported memory type: %d\n",
-                                              __func__, region->memType);
-                                       rc = -EINVAL;
-                                       goto out;
-                               }
-                       }
-
-                       segment->virtAddr = NULL;
-                       segment->physAddr = 0;
-                       segment->numBytes = 0;
-               }
-
-               if (region->numLockedPages > 0) {
-                       int pageIdx;
-
-                       /* Some user pages were locked. We need to go and unlock them now. */
-
-                       for (pageIdx = 0; pageIdx < region->numLockedPages;
-                            pageIdx++) {
-                               struct page *page =
-                                   region->lockedPages[pageIdx];
-
-                               if (memMap->dir == DMA_FROM_DEVICE) {
-                                       SetPageDirty(page);
-                               }
-                               page_cache_release(page);
-                       }
-                       kfree(region->lockedPages);
-                       region->numLockedPages = 0;
-                       region->lockedPages = NULL;
-               }
-
-               region->memType = DMA_MEM_TYPE_NONE;
-               region->virtAddr = NULL;
-               region->numBytes = 0;
-               region->numSegmentsUsed = 0;
-       }
-       memMap->userTask = NULL;
-       memMap->numRegionsUsed = 0;
-       memMap->inUse = 0;
-
-out:
-       up(&memMap->lock);
-
-       return rc;
-}
-
-EXPORT_SYMBOL(dma_unmap);

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