MIPS: Add a platform hook for swiotlb setup.

This allows platforms that are using the swiotlb to initialize it.

Signed-off-by: David Daney <[e-mail]>
Patchwork: http://patchwork.linux-mips.org/patch/1638/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/include/asm/bootinfo.h

···
  */
 extern void plat_mem_setup(void);
 
+#ifdef CONFIG_SWIOTLB
+/*
+ * Optional platform hook to call swiotlb_setup().
+ */
+extern void plat_swiotlb_setup(void);
+
+#else
+
+static inline void plat_swiotlb_setup(void) {}
+
+#endif /* CONFIG_SWIOTLB */
+
 #endif /* _ASM_BOOTINFO_H */

arch/mips/kernel/setup.c

···
 	bootmem_init();
 	device_tree_init();
 	sparse_init();
+	plat_swiotlb_setup();
 	paging_init();
 }