ITE: drivers/bbram: add magic number to compare in initial
BBRAM content should be cleared when boot from cutoff. Compare magic number to decide whether to clear entire BBRAM. Signed-off-by: Tim Lin <tim2.lin@ite.corp-partner.google.com>
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2 changed files with 49 additions and 2 deletions
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@ -13,6 +13,12 @@
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#include <logging/log.h>
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LOG_MODULE_REGISTER(bbram, CONFIG_BBRAM_LOG_LEVEL);
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#define BRAM_VALID_MAGIC 0x4252414D /* "BRAM" */
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#define BRAM_VALID_MAGIC_FIELD0 (BRAM_VALID_MAGIC & 0xff)
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#define BRAM_VALID_MAGIC_FIELD1 ((BRAM_VALID_MAGIC >> 8) & 0xff)
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#define BRAM_VALID_MAGIC_FIELD2 ((BRAM_VALID_MAGIC >> 16) & 0xff)
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#define BRAM_VALID_MAGIC_FIELD3 ((BRAM_VALID_MAGIC >> 24) & 0xff)
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/** Device config */
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struct bbram_it8xxx2_config {
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/** BBRAM base address */
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@ -53,7 +59,30 @@ static const struct bbram_driver_api bbram_it8xxx2_driver_api = {
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static int bbram_it8xxx2_init(const struct device *dev)
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{
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ARG_UNUSED(dev);
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const struct bbram_it8xxx2_config *config = dev->config;
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uint8_t *base_addr = (uint8_t *)config->base_addr;
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uint8_t *bram_valid_flag0 = base_addr + BRAM_IDX_VALID_FLAGS0;
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uint8_t *bram_valid_flag1 = base_addr + BRAM_IDX_VALID_FLAGS1;
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uint8_t *bram_valid_flag2 = base_addr + BRAM_IDX_VALID_FLAGS2;
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uint8_t *bram_valid_flag3 = base_addr + BRAM_IDX_VALID_FLAGS3;
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if ((*bram_valid_flag0 != BRAM_VALID_MAGIC_FIELD0) ||
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(*bram_valid_flag1 != BRAM_VALID_MAGIC_FIELD1) ||
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(*bram_valid_flag2 != BRAM_VALID_MAGIC_FIELD2) ||
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(*bram_valid_flag3 != BRAM_VALID_MAGIC_FIELD3)) {
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/*
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* Magic does not match, so BRAM must be uninitialized. Clear
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* entire Bank0 BRAM, and set magic value.
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*/
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for (int i = 0; i < BRAM_IDX_VALID_FLAGS0; i++) {
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*(base_addr + i) = 0;
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}
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*bram_valid_flag0 = BRAM_VALID_MAGIC_FIELD0;
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*bram_valid_flag1 = BRAM_VALID_MAGIC_FIELD1;
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*bram_valid_flag2 = BRAM_VALID_MAGIC_FIELD2;
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*bram_valid_flag3 = BRAM_VALID_MAGIC_FIELD3;
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}
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return 0;
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}
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@ -1,4 +1,4 @@
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/*
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/*
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* Copyright (c) 2020 ITE Corporation. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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@ -1876,6 +1876,24 @@ struct gctrl_it8xxx2_regs {
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/* bit[2] = 1: Enable global reset. */
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#define IT8XXX2_GCTRL_GRST BIT(2)
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/**
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*
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* (22xxh) Battery-backed SRAM (BRAM) registers
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*
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*/
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#ifndef __ASSEMBLER__
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/* Battery backed RAM indices. */
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#define BRAM_MAGIC_FIELD_OFFSET 0xbc
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enum bram_indices {
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/* This field is used to indicate BRAM is valid or not. */
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BRAM_IDX_VALID_FLAGS0 = BRAM_MAGIC_FIELD_OFFSET,
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BRAM_IDX_VALID_FLAGS1,
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BRAM_IDX_VALID_FLAGS2,
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BRAM_IDX_VALID_FLAGS3
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};
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#endif /* !__ASSEMBLER__ */
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#ifndef __ASSEMBLER__
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/*
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* EC2I bridge registers
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