1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * (C) Copyright 2010
3*4882a593Smuzhiyun * Heiko Schocher, DENX Software Engineering, hs@denx.de.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <common.h>
9*4882a593Smuzhiyun #include <asm/io.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR;
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun const ulong patterns[] = { 0x00000000,
14*4882a593Smuzhiyun 0xFFFFFFFF,
15*4882a593Smuzhiyun 0xFF00FF00,
16*4882a593Smuzhiyun 0x0F0F0F0F,
17*4882a593Smuzhiyun 0xF0F0F0F0};
18*4882a593Smuzhiyun const ulong NBR_OF_PATTERNS = sizeof(patterns) / sizeof(*patterns);
19*4882a593Smuzhiyun const ulong OFFS_PATTERN = 3;
20*4882a593Smuzhiyun const ulong REPEAT_PATTERN = 1000;
21*4882a593Smuzhiyun
bootcount_store(ulong a)22*4882a593Smuzhiyun void bootcount_store(ulong a)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun ulong *save_addr;
25*4882a593Smuzhiyun ulong size = 0;
26*4882a593Smuzhiyun int i;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
29*4882a593Smuzhiyun size += gd->bd->bi_dram[i].size;
30*4882a593Smuzhiyun save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
31*4882a593Smuzhiyun writel(a, save_addr);
32*4882a593Smuzhiyun writel(BOOTCOUNT_MAGIC, &save_addr[1]);
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun for (i = 0; i < REPEAT_PATTERN; i++)
35*4882a593Smuzhiyun writel(patterns[i % NBR_OF_PATTERNS],
36*4882a593Smuzhiyun &save_addr[i + OFFS_PATTERN]);
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun /* Make sure the data is written to RAM */
39*4882a593Smuzhiyun flush_dcache_range((ulong)&save_addr[0],
40*4882a593Smuzhiyun (((ulong)&save_addr[REPEAT_PATTERN + OFFS_PATTERN] &
41*4882a593Smuzhiyun ~(ARCH_DMA_MINALIGN - 1)) + ARCH_DMA_MINALIGN));
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
bootcount_load(void)44*4882a593Smuzhiyun ulong bootcount_load(void)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun ulong *save_addr;
47*4882a593Smuzhiyun ulong size = 0;
48*4882a593Smuzhiyun ulong counter = 0;
49*4882a593Smuzhiyun int i, tmp;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
52*4882a593Smuzhiyun size += gd->bd->bi_dram[i].size;
53*4882a593Smuzhiyun save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun counter = readl(&save_addr[0]);
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun /* Is the counter reliable, check in the big pattern for bit errors */
58*4882a593Smuzhiyun for (i = 0; (i < REPEAT_PATTERN) && (counter != 0); i++) {
59*4882a593Smuzhiyun tmp = readl(&save_addr[i + OFFS_PATTERN]);
60*4882a593Smuzhiyun if (tmp != patterns[i % NBR_OF_PATTERNS])
61*4882a593Smuzhiyun counter = 0;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun return counter;
64*4882a593Smuzhiyun }
65