void arch_sync_dma_for_device()

in kernel/dma.c [98:125]

• 20 lines of code
• 5 McCabe index (conditional complexity)

void arch_sync_dma_for_device(phys_addr_t addr, size_t size,
		enum dma_data_direction dir)
{
	unsigned long cl;
	struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];

	switch (dir) {
	case DMA_TO_DEVICE:
		/* Flush the dcache for the requested range */
		for (cl = addr; cl < addr + size;
		     cl += cpuinfo->dcache_block_size)
			mtspr(SPR_DCBFR, cl);
		break;
	case DMA_FROM_DEVICE:
		/* Invalidate the dcache for the requested range */
		for (cl = addr; cl < addr + size;
		     cl += cpuinfo->dcache_block_size)
			mtspr(SPR_DCBIR, cl);
		break;
	default:
		/*
		 * NOTE: If dir == DMA_BIDIRECTIONAL then there's no need to
		 * flush nor invalidate the cache here as the area will need
		 * to be manually synced anyway.
		 */
		break;
	}
}