[PATCH 2/2] arm: mvebu: Add hardware I/O Coherency support

On Wednesday 24 October 2012, Gregory CLEMENT wrote:

+void __init armada_370_xp_coherency_iocache_init(void)
+{
+       /* When the coherency fabric is available, the Armada XP and
+        * Aramada 370 are close to a coherent architecture, so we based
+        * our dma ops on the coherent one, and just changes the
+        * operations which need a arch io sync */
+       if (of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric")) {
+               struct dma_map_ops *dma_ops = &armada_xp_dma_ops;
+               memcpy(dma_ops, &arm_coherent_dma_ops, sizeof(*dma_ops));
+               dma_ops->map_page = armada_xp_dma_map_page;
+               dma_ops->unmap_page = armada_xp_dma_unmap_page;
+               dma_ops->unmap_sg = arm_dma_ops.unmap_sg;
+               dma_ops->sync_single_for_cpu = armada_xp_dma_sync;
+               dma_ops->sync_single_for_device = armada_xp_dma_sync;
+               dma_ops->sync_sg_for_cpu = arm_dma_ops.sync_sg_for_cpu;
+               dma_ops->sync_sg_for_device = arm_dma_ops.sync_sg_for_device;
+       }
+       bus_register_notifier(&platform_bus_type, &armada_xp_platform_nb);

I think it would be cleaner to statically define the operations in a constant
structure and point directly to the functions you need. If necessary, use
multiple structures.

	Arnd