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
12unsigned int ppc_swiotlb_enable;
13unsigned int ppc_swiotlb_flags;
14
15void __init swiotlb_detect_4g(void)
16{
17	if ((memblock_end_of_DRAM() - 1) > 0xffffffff)
18		ppc_swiotlb_enable = 1;
19}
20
21static int __init check_swiotlb_enabled(void)
22{
23	if (ppc_swiotlb_enable)
24		swiotlb_print_info();
25	else
26		swiotlb_exit();
27
28	return 0;
29}
30subsys_initcall(check_swiotlb_enabled);
31