[ubicom32]: move new files out from platform support patch

[openwrt/svn-archive/archive.git] / target / linux / ubicom32 / files / arch / ubicom32 / kernel / dma.c

diff --git a/target/linux/ubicom32/files/arch/ubicom32/kernel/dma.c b/target/linux/ubicom32/files/arch/ubicom32/kernel/dma.c
new file mode 100644 (file)
index 0000000..f618105
--- /dev/null
+++ b/target/linux/ubicom32/files/arch/ubicom32/kernel/dma.c
@@ -0,0 +1,60 @@
+/*
+ * arch/ubicom32/kernel/dma.c
+ *   Ubicom32 architecture dynamic DMA mapping support.
+ *
+ * (C) Copyright 2009, Ubicom, Inc.
+ *
+ * This file is part of the Ubicom32 Linux Kernel Port.
+ *
+ * The Ubicom32 Linux Kernel Port is free software: you can redistribute
+ * it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * The Ubicom32 Linux Kernel Port is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Ubicom32 Linux Kernel Port.  If not,
+ * see <http://www.gnu.org/licenses/>.
+ *
+ * Ubicom32 implementation derived from (with many thanks):
+ *   arch/m68knommu
+ *   arch/blackfin
+ *   arch/parisc
+ *
+ * We never have any address translations to worry about, so this
+ * is just alloc/free.
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/device.h>
+#include <linux/io.h>
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+                          dma_addr_t *dma_handle, int gfp)
+{
+       void *ret;
+       /* ignore region specifiers */
+       gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
+
+       if (dev == NULL || (*dev->dma_mask < 0xffffffff))
+               gfp |= GFP_DMA;
+       ret = (void *)__get_free_pages(gfp, get_order(size));
+
+       if (ret != NULL) {
+               memset(ret, 0, size);
+               *dma_handle = virt_to_phys(ret);
+       }
+       return ret;
+}
+
+void dma_free_coherent(struct device *dev, size_t size,
+                        void *vaddr, dma_addr_t dma_handle)
+{
+       free_pages((unsigned long)vaddr, get_order(size));
+}