1 files changed, 85 insertions, 0 deletions

diff --git a/arch/sh/mm/consistent.c b/arch/sh/mm/consistent.c
new file mode 100644
index 000000000000..1f7af0c73cf4
--- /dev/null
+++ b/arch/sh/mm/consistent.c
@@ -0,0 +1,85 @@
+/*
+ * arch/sh/mm/consistent.c
+ *
+ * Copyright (C) 2004  Paul Mundt
+ *
+ * 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.
+ */
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <asm/io.h>
+
+void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle)
+{
+        struct page *page, *end, *free;
+        void *ret;
+        int order;
+
+        size = PAGE_ALIGN(size);
+        order = get_order(size);
+
+        page = alloc_pages(gfp, order);
+        if (!page)
+                return NULL;
+
+        ret = page_address(page);
+        *handle = virt_to_phys(ret);
+
+        /*
+         * We must flush the cache before we pass it on to the device
+         */
+        dma_cache_wback_inv(ret, size);
+
+        page = virt_to_page(ret);
+        free = page + (size >> PAGE_SHIFT);
+        end  = page + (1 << order);
+
+        while (++page < end) {
+                set_page_count(page, 1);
+
+                /* Free any unused pages */
+                if (page >= free) {
+                        __free_page(page);
+                }
+        }
+
+        return P2SEGADDR(ret);
+}
+
+void consistent_free(void *vaddr, size_t size)
+{
+        unsigned long addr = P1SEGADDR((unsigned long)vaddr);
+        struct page *page=virt_to_page(addr);
+        int num_pages=(size+PAGE_SIZE-1) >> PAGE_SHIFT;
+        int i;
+
+        for(i=0;i<num_pages;i++) {
+                __free_page((page+i));
+        }
+}
+
+void consistent_sync(void *vaddr, size_t size, int direction)
+{
+        void * p1addr = (void*) P1SEGADDR((unsigned long)vaddr);
+
+        switch (direction) {
+        case DMA_FROM_DEVICE:           /* invalidate only */
+                dma_cache_inv(p1addr, size);
+                break;
+        case DMA_TO_DEVICE:             /* writeback only */
+                dma_cache_wback(p1addr, size);
+                break;
+        case DMA_BIDIRECTIONAL:         /* writeback and invalidate */
+                dma_cache_wback_inv(p1addr, size);
+                break;
+        default:
+                BUG();
+        }
+}
+
+EXPORT_SYMBOL(consistent_alloc);
+EXPORT_SYMBOL(consistent_free);
+EXPORT_SYMBOL(consistent_sync);
+