MIPS: ath25: add common parts

Add common code for Atheros AR5312 and Atheros AR2315 SoCs families.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Cc: Linux MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8237
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/mach-ath25/dma-coherence.h

@@ -0,0 +1,64 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2006  Ralf Baechle <ralf@linux-mips.org>
+ * Copyright (C) 2007  Felix Fietkau <nbd@openwrt.org>
+ *
+ */
+#ifndef __ASM_MACH_ATH25_DMA_COHERENCE_H
+#define __ASM_MACH_ATH25_DMA_COHERENCE_H
+
+#include <linux/device.h>
+
+static inline dma_addr_t
+plat_map_dma_mem(struct device *dev, void *addr, size_t size)
+{
+	return virt_to_phys(addr);
+}
+
+static inline dma_addr_t
+plat_map_dma_mem_page(struct device *dev, struct page *page)
+{
+	return page_to_phys(page);
+}
+
+static inline unsigned long
+plat_dma_addr_to_phys(struct device *dev, dma_addr_t dma_addr)
+{
+	return dma_addr;
+}
+
+static inline void
+plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr, size_t size,
+		   enum dma_data_direction direction)
+{
+}
+
+static inline int plat_dma_supported(struct device *dev, u64 mask)
+{
+	return 1;
+}
+
+static inline void plat_extra_sync_for_device(struct device *dev)
+{
+}
+
+static inline int plat_dma_mapping_error(struct device *dev,
+					 dma_addr_t dma_addr)
+{
+	return 0;
+}
+
+static inline int plat_device_is_coherent(struct device *dev)
+{
+#ifdef CONFIG_DMA_COHERENT
+	return 1;
+#endif
+#ifdef CONFIG_DMA_NONCOHERENT
+	return 0;
+#endif
+}
+
+#endif /* __ASM_MACH_ATH25_DMA_COHERENCE_H */