blob: 5bdabcd562090bcee93e05abcef48c971144177d [file] [log] [blame]
Stefan Roese0044c422012-08-16 17:55:41 +00001/*
2 * (C) Copyright 2010
3 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
4 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02005 * SPDX-License-Identifier: GPL-2.0+
Stefan Roese0044c422012-08-16 17:55:41 +00006 */
7
8#include <common.h>
9#include <asm/io.h>
10
11DECLARE_GLOBAL_DATA_PTR;
12
13const ulong patterns[] = { 0x00000000,
14 0xFFFFFFFF,
15 0xFF00FF00,
16 0x0F0F0F0F,
17 0xF0F0F0F0};
18const ulong NBR_OF_PATTERNS = sizeof(patterns) / sizeof(*patterns);
19const ulong OFFS_PATTERN = 3;
20const ulong REPEAT_PATTERN = 1000;
21
22void bootcount_store(ulong a)
23{
24 ulong *save_addr;
25 ulong size = 0;
26 int i;
27
28 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
29 size += gd->bd->bi_dram[i].size;
30 save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
31 writel(a, save_addr);
32 writel(BOOTCOUNT_MAGIC, &save_addr[1]);
33
34 for (i = 0; i < REPEAT_PATTERN; i++)
35 writel(patterns[i % NBR_OF_PATTERNS],
36 &save_addr[i + OFFS_PATTERN]);
37
38}
39
40ulong bootcount_load(void)
41{
42 ulong *save_addr;
43 ulong size = 0;
44 ulong counter = 0;
45 int i, tmp;
46
47 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
48 size += gd->bd->bi_dram[i].size;
49 save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
50
51 counter = readl(&save_addr[0]);
52
53 /* Is the counter reliable, check in the big pattern for bit errors */
54 for (i = 0; (i < REPEAT_PATTERN) && (counter != 0); i++) {
55 tmp = readl(&save_addr[i + OFFS_PATTERN]);
56 if (tmp != patterns[i % NBR_OF_PATTERNS])
57 counter = 0;
58 }
59 return counter;
60}