summaryrefslogtreecommitdiff
path: root/arch/arm64/mm/dma-mapping.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm64/mm/dma-mapping.c')
-rw-r--r--arch/arm64/mm/dma-mapping.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
new file mode 100644
index 000000000000..5eb244453a5b
--- /dev/null
+++ b/arch/arm64/mm/dma-mapping.c
@@ -0,0 +1,79 @@
+/*
+ * SWIOTLB-based DMA API implementation
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/gfp.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/vmalloc.h>
+#include <linux/swiotlb.h>
+
+#include <asm/cacheflush.h>
+
+struct dma_map_ops *dma_ops;
+EXPORT_SYMBOL(dma_ops);
+
+static void *arm64_swiotlb_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t flags,
+ struct dma_attrs *attrs)
+{
+ if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
+ dev->coherent_dma_mask <= DMA_BIT_MASK(32))
+ flags |= GFP_DMA32;
+ return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
+}
+
+static void arm64_swiotlb_free_coherent(struct device *dev, size_t size,
+ void *vaddr, dma_addr_t dma_handle,
+ struct dma_attrs *attrs)
+{
+ swiotlb_free_coherent(dev, size, vaddr, dma_handle);
+}
+
+static struct dma_map_ops arm64_swiotlb_dma_ops = {
+ .alloc = arm64_swiotlb_alloc_coherent,
+ .free = arm64_swiotlb_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,
+ .dma_supported = swiotlb_dma_supported,
+ .mapping_error = swiotlb_dma_mapping_error,
+};
+
+void __init swiotlb_init_with_default_size(size_t default_size, int verbose);
+
+void __init arm64_swiotlb_init(size_t max_size)
+{
+ dma_ops = &arm64_swiotlb_dma_ops;
+ swiotlb_init_with_default_size(min((size_t)SZ_64M, max_size), 1);
+}
+
+#define PREALLOC_DMA_DEBUG_ENTRIES 4096
+
+static int __init dma_debug_do_init(void)
+{
+ dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+ return 0;
+}
+fs_initcall(dma_debug_do_init);