This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / m68k / kernel / dma.c

diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c
new file mode 100644 (file)
index 0000000..fc449f8
--- /dev/null
+++ b/arch/m68k/kernel/dma.c
@@ -0,0 +1,129 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#undef DEBUG
+
+#include <linux/dma-mapping.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/vmalloc.h>
+
+#include <asm/pgalloc.h>
+#include <asm/scatterlist.h>
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+                        dma_addr_t *handle, int flag)
+{
+       struct page *page, **map;
+       pgprot_t pgprot;
+       void *addr;
+       int i, order;
+
+       pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
+
+       size = PAGE_ALIGN(size);
+       order = get_order(size);
+
+       page = alloc_pages(flag, order);
+       if (!page)
+               return NULL;
+
+       *handle = page_to_phys(page);
+       map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
+       if (!map) {
+               __free_pages(page, order);
+               return NULL;
+       }
+       split_page(page, order);
+
+       order = 1 << order;
+       size >>= PAGE_SHIFT;
+       map[0] = page;
+       for (i = 1; i < size; i++)
+               map[i] = page + i;
+       for (; i < order; i++)
+               __free_page(page + i);
+       pgprot = __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
+       if (CPU_IS_040_OR_060)
+               pgprot_val(pgprot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
+       else
+               pgprot_val(pgprot) |= _PAGE_NOCACHE030;
+       addr = vmap(map, size, flag, pgprot);
+       kfree(map);
+
+       return addr;
+}
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+void dma_free_coherent(struct device *dev, size_t size,
+                      void *addr, dma_addr_t handle)
+{
+       pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
+       vfree(addr);
+}
+EXPORT_SYMBOL(dma_free_coherent);
+
+inline void dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
+                                      enum dma_data_direction dir)
+{
+       switch (dir) {
+       case DMA_TO_DEVICE:
+               cache_push(handle, size);
+               break;
+       case DMA_FROM_DEVICE:
+               cache_clear(handle, size);
+               break;
+       default:
+               if (printk_ratelimit())
+                       printk("dma_sync_single_for_device: unsupported dir %u\n", dir);
+               break;
+       }
+}
+EXPORT_SYMBOL(dma_sync_single_for_device);
+
+void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,
+                           enum dma_data_direction dir)
+{
+       int i;
+
+       for (i = 0; i < nents; sg++, i++)
+               dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir);
+}
+EXPORT_SYMBOL(dma_sync_sg_for_device);
+
+dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size,
+                         enum dma_data_direction dir)
+{
+       dma_addr_t handle = virt_to_bus(addr);
+
+       dma_sync_single_for_device(dev, handle, size, dir);
+       return handle;
+}
+EXPORT_SYMBOL(dma_map_single);
+
+dma_addr_t dma_map_page(struct device *dev, struct page *page,
+                       unsigned long offset, size_t size,
+                       enum dma_data_direction dir)
+{
+       dma_addr_t handle = page_to_phys(page) + offset;
+
+       dma_sync_single_for_device(dev, handle, size, dir);
+       return handle;
+}
+EXPORT_SYMBOL(dma_map_page);
+
+int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+              enum dma_data_direction dir)
+{
+       int i;
+
+       for (i = 0; i < nents; sg++, i++) {
+               sg->dma_address = page_to_phys(sg->page) + sg->offset;
+               dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir);
+       }
+       return nents;
+}
+EXPORT_SYMBOL(dma_map_sg);