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[u-boot] / drivers / bootcount / bootcount_ram.c
1 /*
2  * (C) Copyright 2010
3  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
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         /* 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
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 }