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63 lines
1.5 KiB
63 lines
1.5 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* (C) Copyright 2010 |
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* Heiko Schocher, DENX Software Engineering, [email protected]. |
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*/ |
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#include <common.h> |
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#include <asm/io.h> |
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DECLARE_GLOBAL_DATA_PTR; |
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const ulong patterns[] = { 0x00000000, |
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0xFFFFFFFF, |
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0xFF00FF00, |
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0x0F0F0F0F, |
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0xF0F0F0F0}; |
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const ulong NBR_OF_PATTERNS = sizeof(patterns) / sizeof(*patterns); |
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const ulong OFFS_PATTERN = 3; |
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const ulong REPEAT_PATTERN = 1000; |
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void bootcount_store(ulong a) |
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{ |
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ulong *save_addr; |
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ulong size = 0; |
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int i; |
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for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) |
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size += gd->bd->bi_dram[i].size; |
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save_addr = (ulong *)(size - BOOTCOUNT_ADDR); |
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writel(a, save_addr); |
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writel(BOOTCOUNT_MAGIC, &save_addr[1]); |
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for (i = 0; i < REPEAT_PATTERN; i++) |
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writel(patterns[i % NBR_OF_PATTERNS], |
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&save_addr[i + OFFS_PATTERN]); |
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/* Make sure the data is written to RAM */ |
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flush_dcache_range((ulong)&save_addr[0], |
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(((ulong)&save_addr[REPEAT_PATTERN + OFFS_PATTERN] & |
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~(ARCH_DMA_MINALIGN - 1)) + ARCH_DMA_MINALIGN)); |
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} |
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ulong bootcount_load(void) |
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{ |
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ulong *save_addr; |
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ulong size = 0; |
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ulong counter = 0; |
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int i, tmp; |
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for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) |
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size += gd->bd->bi_dram[i].size; |
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save_addr = (ulong *)(size - BOOTCOUNT_ADDR); |
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counter = readl(&save_addr[0]); |
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/* Is the counter reliable, check in the big pattern for bit errors */ |
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for (i = 0; (i < REPEAT_PATTERN) && (counter != 0); i++) { |
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tmp = readl(&save_addr[i + OFFS_PATTERN]); |
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if (tmp != patterns[i % NBR_OF_PATTERNS]) |
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counter = 0; |
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} |
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return counter; |
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}
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