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/*
* (C) Copyright 2010
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <common.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
const ulong patterns[] = { 0x00000000,
0xFFFFFFFF,
0xFF00FF00,
0x0F0F0F0F,
0xF0F0F0F0};
const ulong NBR_OF_PATTERNS = sizeof(patterns) / sizeof(*patterns);
const ulong OFFS_PATTERN = 3;
const ulong REPEAT_PATTERN = 1000;
void bootcount_store(ulong a)
{
ulong *save_addr;
ulong size = 0;
int i;
for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
size += gd->bd->bi_dram[i].size;
save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
writel(a, save_addr);
writel(BOOTCOUNT_MAGIC, &save_addr[1]);
for (i = 0; i < REPEAT_PATTERN; i++)
writel(patterns[i % NBR_OF_PATTERNS],
&save_addr[i + OFFS_PATTERN]);
}
ulong bootcount_load(void)
{
ulong *save_addr;
ulong size = 0;
ulong counter = 0;
int i, tmp;
for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
size += gd->bd->bi_dram[i].size;
save_addr = (ulong *)(size - BOOTCOUNT_ADDR);
counter = readl(&save_addr[0]);
/* Is the counter reliable, check in the big pattern for bit errors */
for (i = 0; (i < REPEAT_PATTERN) && (counter != 0); i++) {
tmp = readl(&save_addr[i + OFFS_PATTERN]);
if (tmp != patterns[i % NBR_OF_PATTERNS])
counter = 0;
}
return counter;
}
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