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-rw-r--r--arch/c6x/kernel/dma.c153
1 files changed, 153 insertions, 0 deletions
diff --git a/arch/c6x/kernel/dma.c b/arch/c6x/kernel/dma.c
new file mode 100644
index 00000000000..ab7b12de144
--- /dev/null
+++ b/arch/c6x/kernel/dma.c
@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) 2011 Texas Instruments Incorporated
+ * Author: Mark Salter <msalter@redhat.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.
+ */
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/mm.h>
+#include <linux/mm_types.h>
+#include <linux/scatterlist.h>
+
+#include <asm/cacheflush.h>
+
+static void c6x_dma_sync(dma_addr_t handle, size_t size,
+ enum dma_data_direction dir)
+{
+ unsigned long paddr = handle;
+
+ BUG_ON(!valid_dma_direction(dir));
+
+ switch (dir) {
+ case DMA_FROM_DEVICE:
+ L2_cache_block_invalidate(paddr, paddr + size);
+ break;
+ case DMA_TO_DEVICE:
+ L2_cache_block_writeback(paddr, paddr + size);
+ break;
+ case DMA_BIDIRECTIONAL:
+ L2_cache_block_writeback_invalidate(paddr, paddr + size);
+ break;
+ default:
+ break;
+ }
+}
+
+dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
+ enum dma_data_direction dir)
+{
+ dma_addr_t addr = virt_to_phys(ptr);
+
+ c6x_dma_sync(addr, size, dir);
+
+ debug_dma_map_page(dev, virt_to_page(ptr),
+ (unsigned long)ptr & ~PAGE_MASK, size,
+ dir, addr, true);
+ return addr;
+}
+EXPORT_SYMBOL(dma_map_single);
+
+
+void dma_unmap_single(struct device *dev, dma_addr_t handle,
+ size_t size, enum dma_data_direction dir)
+{
+ c6x_dma_sync(handle, size, dir);
+
+ debug_dma_unmap_page(dev, handle, size, dir, true);
+}
+EXPORT_SYMBOL(dma_unmap_single);
+
+
+int dma_map_sg(struct device *dev, struct scatterlist *sglist,
+ int nents, enum dma_data_direction dir)
+{
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sglist, sg, nents, i)
+ sg->dma_address = dma_map_single(dev, sg_virt(sg), sg->length,
+ dir);
+
+ debug_dma_map_sg(dev, sglist, nents, nents, dir);
+
+ return nents;
+}
+EXPORT_SYMBOL(dma_map_sg);
+
+
+void dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
+ int nents, enum dma_data_direction dir)
+{
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sglist, sg, nents, i)
+ dma_unmap_single(dev, sg_dma_address(sg), sg->length, dir);
+
+ debug_dma_unmap_sg(dev, sglist, nents, dir);
+}
+EXPORT_SYMBOL(dma_unmap_sg);
+
+void dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
+ size_t size, enum dma_data_direction dir)
+{
+ c6x_dma_sync(handle, size, dir);
+
+ debug_dma_sync_single_for_cpu(dev, handle, size, dir);
+}
+EXPORT_SYMBOL(dma_sync_single_for_cpu);
+
+
+void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
+ size_t size, enum dma_data_direction dir)
+{
+ c6x_dma_sync(handle, size, dir);
+
+ debug_dma_sync_single_for_device(dev, handle, size, dir);
+}
+EXPORT_SYMBOL(dma_sync_single_for_device);
+
+
+void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist,
+ int nents, enum dma_data_direction dir)
+{
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sglist, sg, nents, i)
+ dma_sync_single_for_cpu(dev, sg_dma_address(sg),
+ sg->length, dir);
+
+ debug_dma_sync_sg_for_cpu(dev, sglist, nents, dir);
+}
+EXPORT_SYMBOL(dma_sync_sg_for_cpu);
+
+
+void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
+ int nents, enum dma_data_direction dir)
+{
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sglist, sg, nents, i)
+ dma_sync_single_for_device(dev, sg_dma_address(sg),
+ sg->length, dir);
+
+ debug_dma_sync_sg_for_device(dev, sglist, nents, dir);
+}
+EXPORT_SYMBOL(dma_sync_sg_for_device);
+
+
+/* Number of entries preallocated for DMA-API debugging */
+#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
+
+static int __init dma_init(void)
+{
+ dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+
+ return 0;
+}
+fs_initcall(dma_init);