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 <common.h>
8 #include <cpu_func.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
bootcount_store(ulong a)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(CONFIG_SYS_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 /* Make sure the data is written to RAM */
39 flush_dcache_range((ulong)&save_addr[0],
40 (((ulong)&save_addr[REPEAT_PATTERN + OFFS_PATTERN] &
41 ~(ARCH_DMA_MINALIGN - 1)) + ARCH_DMA_MINALIGN));
42 }
43
bootcount_load(void)44 ulong bootcount_load(void)
45 {
46 ulong *save_addr;
47 ulong size = 0;
48 ulong counter = 0;
49 int i, tmp;
50
51 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
52 size += gd->bd->bi_dram[i].size;
53 save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
54
55 counter = readl(&save_addr[0]);
56
57 /* Is the counter reliable, check in the big pattern for bit errors */
58 for (i = 0; (i < REPEAT_PATTERN) && (counter != 0); i++) {
59 tmp = readl(&save_addr[i + OFFS_PATTERN]);
60 if (tmp != patterns[i % NBR_OF_PATTERNS])
61 counter = 0;
62 }
63 return counter;
64 }
65