| 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 | |
| 12 | void 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(address: 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 | */ |
| 39 | static 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 |