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/cache.h>
10 #include <asm/global_data.h>
11 #include <asm/io.h>
12
13 DECLARE_GLOBAL_DATA_PTR;
14
15 const ulong patterns[] = { 0x00000000,
16 0xFFFFFFFF,
17 0xFF00FF00,
18 0x0F0F0F0F,
19 0xF0F0F0F0};
20 const ulong NBR_OF_PATTERNS = sizeof(patterns) / sizeof(*patterns);
21 const ulong OFFS_PATTERN = 3;
22 const ulong REPEAT_PATTERN = 1000;
23
bootcount_store(ulong a)24 void bootcount_store(ulong a)
25 {
26 ulong *save_addr;
27 ulong size = 0;
28 int i;
29
30 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
31 size += gd->bd->bi_dram[i].size;
32 save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
33 writel(a, save_addr);
34 writel(CONFIG_SYS_BOOTCOUNT_MAGIC, &save_addr[1]);
35
36 for (i = 0; i < REPEAT_PATTERN; i++)
37 writel(patterns[i % NBR_OF_PATTERNS],
38 &save_addr[i + OFFS_PATTERN]);
39
40 /* Make sure the data is written to RAM */
41 flush_dcache_range((ulong)&save_addr[0],
42 (((ulong)&save_addr[REPEAT_PATTERN + OFFS_PATTERN] &
43 ~(ARCH_DMA_MINALIGN - 1)) + ARCH_DMA_MINALIGN));
44 }
45
bootcount_load(void)46 ulong bootcount_load(void)
47 {
48 ulong *save_addr;
49 ulong size = 0;
50 ulong counter = 0;
51 int i, tmp;
52
53 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
54 size += gd->bd->bi_dram[i].size;
55 save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
56
57 counter = readl(&save_addr[0]);
58
59 /* Is the counter reliable, check in the big pattern for bit errors */
60 for (i = 0; (i < REPEAT_PATTERN) && (counter != 0); i++) {
61 tmp = readl(&save_addr[i + OFFS_PATTERN]);
62 if (tmp != patterns[i % NBR_OF_PATTERNS])
63 counter = 0;
64 }
65 return counter;
66 }
67