1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * DMA implementation for Hexagon 4 * 5 * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved. 6 */ 7 8 #include <linux/dma-map-ops.h> 9 #include <linux/memblock.h> 10 #include <asm/page.h> 11 arch_sync_dma_for_device(phys_addr_t paddr,size_t size,enum dma_data_direction dir)12void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, 13 enum dma_data_direction dir) 14 { 15 void *addr = phys_to_virt(paddr); 16 17 switch (dir) { 18 case DMA_TO_DEVICE: 19 hexagon_clean_dcache_range((unsigned long) addr, 20 (unsigned long) addr + size); 21 break; 22 case DMA_FROM_DEVICE: 23 hexagon_inv_dcache_range((unsigned long) addr, 24 (unsigned long) addr + size); 25 break; 26 case DMA_BIDIRECTIONAL: 27 flush_dcache_range((unsigned long) addr, 28 (unsigned long) addr + size); 29 break; 30 default: 31 BUG(); 32 } 33 } 34 35 /* 36 * Our max_low_pfn should have been backed off by 16MB in mm/init.c to create 37 * DMA coherent space. Use that for the pool. 38 */ hexagon_dma_init(void)39static int __init hexagon_dma_init(void) 40 { 41 return dma_init_global_coherent(PFN_PHYS(max_low_pfn), 42 hexagon_coherent_pool_size); 43 } 44 core_initcall(hexagon_dma_init); 45