diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/bootcount/bootcount_ram.c')
-rw-r--r-- | qemu/roms/u-boot/drivers/bootcount/bootcount_ram.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/drivers/bootcount/bootcount_ram.c b/qemu/roms/u-boot/drivers/bootcount/bootcount_ram.c new file mode 100644 index 000000000..5bdabcd56 --- /dev/null +++ b/qemu/roms/u-boot/drivers/bootcount/bootcount_ram.c @@ -0,0 +1,60 @@ +/* + * (C) Copyright 2010 + * Heiko Schocher, DENX Software Engineering, hs@denx.de. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#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; +} |