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Commit | Line | Data |
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0044c42e SR |
1 | /* |
2 | * (C) Copyright 2010 | |
3 | * Heiko Schocher, DENX Software Engineering, hs@denx.de. | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
0044c42e SR |
6 | */ |
7 | ||
8 | #include <common.h> | |
9 | #include <asm/io.h> | |
10 | ||
11 | DECLARE_GLOBAL_DATA_PTR; | |
12 | ||
13 | const ulong patterns[] = { 0x00000000, | |
14 | 0xFFFFFFFF, | |
15 | 0xFF00FF00, | |
16 | 0x0F0F0F0F, | |
17 | 0xF0F0F0F0}; | |
18 | const ulong NBR_OF_PATTERNS = sizeof(patterns) / sizeof(*patterns); | |
19 | const ulong OFFS_PATTERN = 3; | |
20 | const ulong REPEAT_PATTERN = 1000; | |
21 | ||
22 | void 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 | ||
40 | ulong 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 | } |