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"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2010
4 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
5 */
6
7#include <cpu_func.h>
8#include <asm/cache.h>
9#include <asm/global_data.h>
10#include <asm/io.h>
11
12DECLARE_GLOBAL_DATA_PTR;
13
14const ulong patterns[] = { 0x00000000,
15 0xFFFFFFFF,
16 0xFF00FF00,
17 0x0F0F0F0F,
18 0xF0F0F0F0};
19const ulong NBR_OF_PATTERNS = sizeof(patterns) / sizeof(*patterns);
20const ulong OFFS_PATTERN = 3;
21const ulong REPEAT_PATTERN = 1000;
22
23void bootcount_store(ulong a)
24{
25 ulong *save_addr;
26 ulong size = 0;
27 int i;
28
29 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
30 size += gd->bd->bi_dram[i].size;
31 save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
32 writel(a, save_addr);
33 writel(CONFIG_SYS_BOOTCOUNT_MAGIC, &save_addr[1]);
34
35 for (i = 0; i < REPEAT_PATTERN; i++)
36 writel(patterns[i % NBR_OF_PATTERNS],
37 &save_addr[i + OFFS_PATTERN]);
38
39 /* Make sure the data is written to RAM */
40 flush_dcache_range((ulong)&save_addr[0],
41 (((ulong)&save_addr[REPEAT_PATTERN + OFFS_PATTERN] &
42 ~(ARCH_DMA_MINALIGN - 1)) + ARCH_DMA_MINALIGN));
43}
44
45ulong bootcount_load(void)
46{
47 ulong *save_addr;
48 ulong size = 0;
49 ulong counter = 0;
50 int i, tmp;
51
52 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
53 size += gd->bd->bi_dram[i].size;
54 save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
55
56 counter = readl(&save_addr[0]);
57
58 /* Is the counter reliable, check in the big pattern for bit errors */
59 for (i = 0; (i < REPEAT_PATTERN) && (counter != 0); i++) {
60 tmp = readl(&save_addr[i + OFFS_PATTERN]);
61 if (tmp != patterns[i % NBR_OF_PATTERNS])
62 counter = 0;
63 }
64 return counter;
65}