1 files changed, 52 insertions, 0 deletions

diff --git a/arch/sh64/mm/consistent.c b/arch/sh64/mm/consistent.c
new file mode 100644
index 000000000000..8875a2a40da7
--- /dev/null
+++ b/arch/sh64/mm/consistent.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
+ * Copyright (C) 2003 Paul Mundt (lethal@linux-sh.org)
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License.  See linux/COPYING for more information.
+ *
+ * Dynamic DMA mapping support.
+ */
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <asm/io.h>
+
+void *consistent_alloc(struct pci_dev *hwdev, size_t size,
+                           dma_addr_t *dma_handle)
+{
+        void *ret;
+        int gfp = GFP_ATOMIC;
+        void *vp;
+
+        if (hwdev == NULL || hwdev->dma_mask != 0xffffffff)
+                gfp |= GFP_DMA;
+
+        ret = (void *)__get_free_pages(gfp, get_order(size));
+
+        /* now call our friend ioremap_nocache to give us an uncached area */
+        vp = ioremap_nocache(virt_to_phys(ret), size);
+
+        if (vp != NULL) {
+                memset(vp, 0, size);
+                *dma_handle = virt_to_phys(ret);
+                dma_cache_wback_inv((unsigned long)ret, size);
+        }
+
+        return vp;
+}
+EXPORT_SYMBOL(consistent_alloc);
+
+void consistent_free(struct pci_dev *hwdev, size_t size,
+                         void *vaddr, dma_addr_t dma_handle)
+{
+        void *alloc;
+
+        alloc = phys_to_virt((unsigned long)dma_handle);
+        free_pages((unsigned long)alloc, get_order(size));
+
+        iounmap(vaddr);
+}
+EXPORT_SYMBOL(consistent_free);