1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2018 Stefan Roese <sr@denx.de>
4 */
5
6#include <event.h>
7#include <init.h>
8#include <malloc.h>
9#include <asm/addrspace.h>
10#include <asm/global_data.h>
11#include <linux/bitops.h>
12#include <linux/io.h>
13#include <linux/sizes.h>
14
15DECLARE_GLOBAL_DATA_PTR;
16
17int dram_init(void)
18{
19	gd->ram_size = get_ram_size((void *)KSEG1, CONFIG_MAX_MEM_SIZE << 20);
20
21	return 0;
22}
23
24#ifndef CONFIG_SPL_BUILD
25static int last_stage_init(void)
26{
27	void *src, *dst;
28
29	src = malloc(SZ_64K);
30	dst = malloc(SZ_64K);
31	if (!src || !dst) {
32		printf("Can't allocate buffer for cache cleanup copy!\n");
33		return 0;
34	}
35
36	/*
37	 * It has been noticed, that sometimes the d-cache is not in a
38	 * "clean-state" when U-Boot is running on MT7688. This was
39	 * detected when using the ethernet driver (which uses d-cache)
40	 * and a TFTP command does not complete. Copying an area of 64KiB
41	 * in DDR at a very late bootup time in U-Boot, directly before
42	 * calling into the prompt, seems to fix this issue.
43	 */
44	memcpy(dst, src, SZ_64K);
45	free(src);
46	free(dst);
47
48	return 0;
49}
50EVENT_SPY_SIMPLE(EVT_LAST_STAGE_INIT, last_stage_init);
51#endif
52