1 files changed, 107 insertions, 0 deletions

diff --git a/arch/mips/netlogic/common/nlm-dma.c b/arch/mips/netlogic/common/nlm-dma.c
new file mode 100644
index 000000000000..f3d4ae87abc7
--- /dev/null
+++ b/arch/mips/netlogic/common/nlm-dma.c
@@ -0,0 +1,107 @@
+/*
+*  Copyright (C) 2003-2013 Broadcom Corporation
+*  All Rights Reserved
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the Broadcom
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
+#include <linux/bootmem.h>
+#include <linux/export.h>
+#include <linux/swiotlb.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+
+#include <asm/bootinfo.h>
+
+static char *nlm_swiotlb;
+
+static void *nlm_dma_alloc_coherent(struct device *dev, size_t size,
+        dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs)
+{
+        void *ret;
+
+        if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
+                return ret;
+
+        /* ignore region specifiers */
+        gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
+
+#ifdef CONFIG_ZONE_DMA32
+        if (dev->coherent_dma_mask <= DMA_BIT_MASK(32))
+                gfp |= __GFP_DMA32;
+#endif
+
+        /* Don't invoke OOM killer */
+        gfp |= __GFP_NORETRY;
+
+        return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
+}
+
+static void nlm_dma_free_coherent(struct device *dev, size_t size,
+        void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs)
+{
+        int order = get_order(size);
+
+        if (dma_release_from_coherent(dev, order, vaddr))
+                return;
+
+        swiotlb_free_coherent(dev, size, vaddr, dma_handle);
+}
+
+struct dma_map_ops nlm_swiotlb_dma_ops = {
+        .alloc = nlm_dma_alloc_coherent,
+        .free = nlm_dma_free_coherent,
+        .map_page = swiotlb_map_page,
+        .unmap_page = swiotlb_unmap_page,
+        .map_sg = swiotlb_map_sg_attrs,
+        .unmap_sg = swiotlb_unmap_sg_attrs,
+        .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
+        .sync_single_for_device = swiotlb_sync_single_for_device,
+        .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
+        .sync_sg_for_device = swiotlb_sync_sg_for_device,
+        .mapping_error = swiotlb_dma_mapping_error,
+        .dma_supported = swiotlb_dma_supported
+};
+
+void __init plat_swiotlb_setup(void)
+{
+        size_t swiotlbsize;
+        unsigned long swiotlb_nslabs;
+
+        swiotlbsize = 1 << 20; /* 1 MB for now */
+        swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT;
+        swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE);
+        swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT;
+
+        nlm_swiotlb = alloc_bootmem_low_pages(swiotlbsize);
+        swiotlb_init_with_tbl(nlm_swiotlb, swiotlb_nslabs, 1);
+}