1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Based on linux/arch/arm/mm/dma-mapping.c 4 * 5 * Copyright (C) 2000-2004 Russell King 6 */ 7 8 #include <linux/dma-map-ops.h> 9 #include <asm/cachetype.h> 10 #include <asm/cacheflush.h> 11 #include <asm/outercache.h> 12 #include <asm/cp15.h> 13 14 #include "dma.h" 15 16 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, 17 enum dma_data_direction dir) 18 { 19 dmac_map_area(__va(paddr), size, dir); 20 21 if (dir == DMA_FROM_DEVICE) 22 outer_inv_range(paddr, paddr + size); 23 else 24 outer_clean_range(paddr, paddr + size); 25 } 26 27 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, 28 enum dma_data_direction dir) 29 { 30 if (dir != DMA_TO_DEVICE) { 31 outer_inv_range(paddr, paddr + size); 32 dmac_unmap_area(__va(paddr), size, dir); 33 } 34 } 35 36 void arch_setup_dma_ops(struct device *dev, bool coherent) 37 { 38 if (IS_ENABLED(CONFIG_CPU_V7M)) { 39 /* 40 * Cache support for v7m is optional, so can be treated as 41 * coherent if no cache has been detected. Note that it is not 42 * enough to check if MPU is in use or not since in absense of 43 * MPU system memory map is used. 44 */ 45 dev->dma_coherent = cacheid ? coherent : true; 46 } else { 47 /* 48 * Assume coherent DMA in case MMU/MPU has not been set up. 49 */ 50 dev->dma_coherent = (get_cr() & CR_M) ? coherent : true; 51 } 52 } 53