| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * Contains routines needed to support swiotlb for ppc. |
| 4 | * |
| 5 | * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. |
| 6 | * Author: Becky Bruce |
| 7 | */ |
| 8 | #include <linux/memblock.h> |
| 9 | #include <asm/machdep.h> |
| 10 | #include <asm/swiotlb.h> |
| 11 | |
| 12 | unsigned int ppc_swiotlb_enable; |
| 13 | |
| 14 | void __init swiotlb_detect_4g(void) |
| 15 | { |
| 16 | if ((memblock_end_of_DRAM() - 1) > 0xffffffff) |
| 17 | ppc_swiotlb_enable = 1; |
| 18 | } |
| 19 | |
| 20 | static int __init check_swiotlb_enabled(void) |
| 21 | { |
| 22 | if (ppc_swiotlb_enable) |
| 23 | swiotlb_print_info(); |
| 24 | else |
| 25 | swiotlb_exit(); |
| 26 | |
| 27 | return 0; |
| 28 | } |
| 29 | subsys_initcall(check_swiotlb_enabled); |