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-rw-r--r--arch/nios2/mm/dma-mapping.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/nios2/mm/dma-mapping.c b/arch/nios2/mm/dma-mapping.c
new file mode 100644
index 0000000000..fd887d5f3f
--- /dev/null
+++ b/arch/nios2/mm/dma-mapping.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2009 Wind River Systems Inc
+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ *
+ * Based on DMA code from MIPS.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/cache.h>
+#include <asm/cacheflush.h>
+
+void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
+ enum dma_data_direction dir)
+{
+ void *vaddr = phys_to_virt(paddr);
+
+ switch (dir) {
+ case DMA_FROM_DEVICE:
+ invalidate_dcache_range((unsigned long)vaddr,
+ (unsigned long)(vaddr + size));
+ break;
+ case DMA_TO_DEVICE:
+ /*
+ * We just need to flush the caches here , but Nios2 flush
+ * instruction will do both writeback and invalidate.
+ */
+ case DMA_BIDIRECTIONAL: /* flush and invalidate */
+ flush_dcache_range((unsigned long)vaddr,
+ (unsigned long)(vaddr + size));
+ break;
+ default:
+ BUG();
+ }
+}
+
+void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
+ enum dma_data_direction dir)
+{
+ void *vaddr = phys_to_virt(paddr);
+
+ switch (dir) {
+ case DMA_BIDIRECTIONAL:
+ case DMA_FROM_DEVICE:
+ invalidate_dcache_range((unsigned long)vaddr,
+ (unsigned long)(vaddr + size));
+ break;
+ case DMA_TO_DEVICE:
+ break;
+ default:
+ BUG();
+ }
+}
+
+void arch_dma_prep_coherent(struct page *page, size_t size)
+{
+ unsigned long start = (unsigned long)page_address(page);
+
+ flush_dcache_range(start, start + size);
+}
+
+void *arch_dma_set_uncached(void *ptr, size_t size)
+{
+ unsigned long addr = (unsigned long)ptr;
+
+ addr |= CONFIG_NIOS2_IO_REGION_BASE;
+
+ return (void *)ptr;
+}