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 unsigned int ppc_swiotlb_flags;
14
15 void __init swiotlb_detect_4g(void)
16 {
17 if ((memblock_end_of_DRAM() - 1) > 0xffffffff)
18 ppc_swiotlb_enable = 1;
19 }
20
21 static 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 }
30 subsys_initcall(check_swiotlb_enabled);
31
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