1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2011
4 * Graeme Russ, <graeme.russ@gmail.com>
5 */
6
7#include <common.h>
8#include <init.h>
9#include <asm/global_data.h>
10#include <linux/errno.h>
11#include <asm/mtrr.h>
12
13DECLARE_GLOBAL_DATA_PTR;
14
15int init_cache_f_r(void)
16{
17	bool do_mtrr = CONFIG_IS_ENABLED(X86_32BIT_INIT) ||
18		 IS_ENABLED(CONFIG_FSP_VERSION2) ||
19		 (IS_ENABLED(CONFIG_TPL) && IS_ENABLED(CONFIG_HAVE_MRC));
20	int ret;
21
22	/*
23	 * Supported configurations:
24	 *
25	 * booting from slimbootloader - MTRRs are already set up
26	 * booting with FSPv1 - MTRRs are already set up
27	 * booting with FSPv2 or MRC - MTRRs must be set here
28	 * booting from coreboot - in this case there is no SPL, so we set up
29	 *	the MTRRs here
30	 */
31	do_mtrr &= !IS_ENABLED(CONFIG_FSP_VERSION1) &&
32		!IS_ENABLED(CONFIG_SYS_SLIMBOOTLOADER);
33
34	if (do_mtrr) {
35		ret = mtrr_commit(false);
36		/*
37		 * If MTRR MSR is not implemented by the processor, just ignore
38		 * it
39		 */
40		if (ret && ret != -ENOSYS)
41			return ret;
42	}
43
44	/* Initialise the CPU cache(s) */
45	return init_cache();
46}
47