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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Backup data functionality */
#ifndef __CROS_EC_BKPDATA_H
#define __CROS_EC_BKPDATA_H
#include "common.h"
#include "registers.h"
#include "system.h" /* enum system_bbram_idx */
/* We use 16-bit BKP / BBRAM entries. */
#define STM32_BKP_ENTRIES (STM32_BKP_BYTES / 2)
/*
* Use 32-bit for reset flags, if we have space for it:
* - 2 indexes are used unconditionally (SCRATCHPAD and SAVED_RESET_FLAGS)
* - VBNV_CONTEXT requires 8 indexes, so a total of 10 (which is the total
* number of entries on some STM32 variants).
* - Other config options are not a problem (they only take a few entries)
*
* Given this, we can only add an extra entry for the top 16-bit of reset flags
* if VBNV_CONTEXT is not enabled, or if we have more than 10 entries.
*/
#if !defined(CONFIG_HOSTCMD_VBNV_CONTEXT) || STM32_BKP_ENTRIES > 10
#define CONFIG_STM32_RESET_FLAGS_EXTENDED
#endif
enum bkpdata_index {
BKPDATA_INDEX_SCRATCHPAD, /* General-purpose scratchpad */
BKPDATA_INDEX_SAVED_RESET_FLAGS, /* Saved reset flags */
#ifdef CONFIG_STM32_RESET_FLAGS_EXTENDED
BKPDATA_INDEX_SAVED_RESET_FLAGS_2, /* Saved reset flags (cont) */
#endif
#ifdef CONFIG_HOSTCMD_VBNV_CONTEXT
BKPDATA_INDEX_VBNV_CONTEXT0,
BKPDATA_INDEX_VBNV_CONTEXT1,
BKPDATA_INDEX_VBNV_CONTEXT2,
BKPDATA_INDEX_VBNV_CONTEXT3,
BKPDATA_INDEX_VBNV_CONTEXT4,
BKPDATA_INDEX_VBNV_CONTEXT5,
BKPDATA_INDEX_VBNV_CONTEXT6,
BKPDATA_INDEX_VBNV_CONTEXT7,
#endif
#ifdef CONFIG_SOFTWARE_PANIC
BKPDATA_INDEX_SAVED_PANIC_REASON, /* Saved panic reason */
BKPDATA_INDEX_SAVED_PANIC_INFO, /* Saved panic data */
BKPDATA_INDEX_SAVED_PANIC_EXCEPTION, /* Saved panic exception code */
#endif
#ifdef CONFIG_USB_PD_DUAL_ROLE
BKPDATA_INDEX_PD0, /* USB-PD saved port0 state */
BKPDATA_INDEX_PD1, /* USB-PD saved port1 state */
BKPDATA_INDEX_PD2, /* USB-PD saved port2 state */
#endif
BKPDATA_COUNT
};
BUILD_ASSERT(STM32_BKP_ENTRIES >= BKPDATA_COUNT);
/**
* Read backup register at specified index.
*
* @return The value of the register or 0 if invalid index.
*/
uint16_t bkpdata_read(enum bkpdata_index index);
/**
* Write hibernate register at specified index.
*
* @return nonzero if error.
*/
int bkpdata_write(enum bkpdata_index index, uint16_t value);
int bkpdata_index_lookup(enum system_bbram_idx idx, int *msb);
uint32_t bkpdata_read_reset_flags(void);
void bkpdata_write_reset_flags(uint32_t save_flags);
#endif /* __CROS_EC_BKPDATA_H */
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