driver-core: move dma-coherent.c from kernel to driver/base

[pandora-kernel.git] / kernel / dma-coherent.c

diff --git a/kernel/dma-coherent.c b/kernel/dma-coherent.c
deleted file mode 100644 (file)
index 962a3b5..0000000
--- a/kernel/dma-coherent.c
+++ /dev/null
@@ -1,176 +0,0 @@
-/*
- * Coherent per-device memory handling.
- * Borrowed from i386
- */
-#include <linux/kernel.h>
-#include <linux/dma-mapping.h>
-
-struct dma_coherent_mem {
-       void            *virt_base;
-       u32             device_base;
-       int             size;
-       int             flags;
-       unsigned long   *bitmap;
-};
-
-int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
-                               dma_addr_t device_addr, size_t size, int flags)
-{
-       void __iomem *mem_base = NULL;
-       int pages = size >> PAGE_SHIFT;
-       int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
-
-       if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
-               goto out;
-       if (!size)
-               goto out;
-       if (dev->dma_mem)
-               goto out;
-
-       /* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */
-
-       mem_base = ioremap(bus_addr, size);
-       if (!mem_base)
-               goto out;
-
-       dev->dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
-       if (!dev->dma_mem)
-               goto out;
-       dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
-       if (!dev->dma_mem->bitmap)
-               goto free1_out;
-
-       dev->dma_mem->virt_base = mem_base;
-       dev->dma_mem->device_base = device_addr;
-       dev->dma_mem->size = pages;
-       dev->dma_mem->flags = flags;
-
-       if (flags & DMA_MEMORY_MAP)
-               return DMA_MEMORY_MAP;
-
-       return DMA_MEMORY_IO;
-
- free1_out:
-       kfree(dev->dma_mem);
- out:
-       if (mem_base)
-               iounmap(mem_base);
-       return 0;
-}
-EXPORT_SYMBOL(dma_declare_coherent_memory);
-
-void dma_release_declared_memory(struct device *dev)
-{
-       struct dma_coherent_mem *mem = dev->dma_mem;
-
-       if (!mem)
-               return;
-       dev->dma_mem = NULL;
-       iounmap(mem->virt_base);
-       kfree(mem->bitmap);
-       kfree(mem);
-}
-EXPORT_SYMBOL(dma_release_declared_memory);
-
-void *dma_mark_declared_memory_occupied(struct device *dev,
-                                       dma_addr_t device_addr, size_t size)
-{
-       struct dma_coherent_mem *mem = dev->dma_mem;
-       int pos, err;
-
-       size += device_addr & ~PAGE_MASK;
-
-       if (!mem)
-               return ERR_PTR(-EINVAL);
-
-       pos = (device_addr - mem->device_base) >> PAGE_SHIFT;
-       err = bitmap_allocate_region(mem->bitmap, pos, get_order(size));
-       if (err != 0)
-               return ERR_PTR(err);
-       return mem->virt_base + (pos << PAGE_SHIFT);
-}
-EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
-
-/**
- * dma_alloc_from_coherent() - try to allocate memory from the per-device coherent area
- *
- * @dev:       device from which we allocate memory
- * @size:      size of requested memory area
- * @dma_handle:        This will be filled with the correct dma handle
- * @ret:       This pointer will be filled with the virtual address
- *             to allocated area.
- *
- * This function should be only called from per-arch dma_alloc_coherent()
- * to support allocation from per-device coherent memory pools.
- *
- * Returns 0 if dma_alloc_coherent should continue with allocating from
- * generic memory areas, or !0 if dma_alloc_coherent should return @ret.
- */
-int dma_alloc_from_coherent(struct device *dev, ssize_t size,
-                                      dma_addr_t *dma_handle, void **ret)
-{
-       struct dma_coherent_mem *mem;
-       int order = get_order(size);
-       int pageno;
-
-       if (!dev)
-               return 0;
-       mem = dev->dma_mem;
-       if (!mem)
-               return 0;
-
-       *ret = NULL;
-
-       if (unlikely(size > (mem->size << PAGE_SHIFT)))
-               goto err;
-
-       pageno = bitmap_find_free_region(mem->bitmap, mem->size, order);
-       if (unlikely(pageno < 0))
-               goto err;
-
-       /*
-        * Memory was found in the per-device area.
-        */
-       *dma_handle = mem->device_base + (pageno << PAGE_SHIFT);
-       *ret = mem->virt_base + (pageno << PAGE_SHIFT);
-       memset(*ret, 0, size);
-
-       return 1;
-
-err:
-       /*
-        * In the case where the allocation can not be satisfied from the
-        * per-device area, try to fall back to generic memory if the
-        * constraints allow it.
-        */
-       return mem->flags & DMA_MEMORY_EXCLUSIVE;
-}
-EXPORT_SYMBOL(dma_alloc_from_coherent);
-
-/**
- * dma_release_from_coherent() - try to free the memory allocated from per-device coherent memory pool
- * @dev:       device from which the memory was allocated
- * @order:     the order of pages allocated
- * @vaddr:     virtual address of allocated pages
- *
- * This checks whether the memory was allocated from the per-device
- * coherent memory pool and if so, releases that memory.
- *
- * Returns 1 if we correctly released the memory, or 0 if
- * dma_release_coherent() should proceed with releasing memory from
- * generic pools.
- */
-int dma_release_from_coherent(struct device *dev, int order, void *vaddr)
-{
-       struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
-
-       if (mem && vaddr >= mem->virt_base && vaddr <
-                  (mem->virt_base + (mem->size << PAGE_SHIFT))) {
-               int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;
-
-               bitmap_release_region(mem->bitmap, page, order);
-               return 1;
-       }
-       return 0;
-}
-EXPORT_SYMBOL(dma_release_from_coherent);