| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Contains routines needed to support swiotlb for ppc. |
| * |
| * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. |
| * Author: Becky Bruce |
| */ |
| #include <linux/memblock.h> |
| #include <asm/machdep.h> |
| #include <asm/swiotlb.h> |
| |
| unsigned int ppc_swiotlb_enable; |
| |
| void __init swiotlb_detect_4g(void) |
| { |
| if ((memblock_end_of_DRAM() - 1) > 0xffffffff) |
| ppc_swiotlb_enable = 1; |
| } |
| |
| static int __init check_swiotlb_enabled(void) |
| { |
| if (ppc_swiotlb_enable) |
| swiotlb_print_info(); |
| else |
| swiotlb_exit(); |
| |
| return 0; |
| } |
| subsys_initcall(check_swiotlb_enabled); |
