sh64: Move consistent DMA routines to arch/sh64/mm/.

[pandora-kernel.git] / arch / sh64 / mm / consistent.c

diff --git a/arch/sh64/mm/consistent.c b/arch/sh64/mm/consistent.c
new file mode 100644 (file)
index 0000000..8875a2a
--- /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);