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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.
*
* EC-EFS (Early Firmware Selection)
*/
#include "common.h"
#include "console.h"
#include "ec_comm.h"
#include "ec_commands.h"
#include "hooks.h"
#include "registers.h"
#include "system.h"
#include "vboot.h"
#ifdef CR50_DEV
#define CPRINTS(format, args...) cprints(CC_TASK, "EC-EFS: " format, ## args)
#else
#define CPRINTS(format, args...) do { } while (0)
#endif
/*
* Context of EC-EFS
*/
static struct ec_efs_context_ {
uint32_t boot_mode:8; /* enum ec_efs_boot_mode */
uint32_t hash_is_loaded:1; /* Is EC hash loaded from nvmem */
uint32_t reserved:23;
uint32_t secdata_error_code;
uint8_t hash[SHA256_DIGEST_SIZE]; /* EC-RW digest */
} ec_efs_ctx;
/*
* Change the boot mode
*
* @param mode_val New boot mode value to change
*/
static void set_boot_mode_(uint8_t mode_val)
{
CPRINTS("boot_mode: 0x%02x -> 0x%02x", ec_efs_ctx.boot_mode, mode_val);
ec_efs_ctx.boot_mode = mode_val;
/* Backup some ec_efs context to scratch register */
GREG32(PMU, PWRDN_SCRATCH20) &= ~0xff;
GREG32(PMU, PWRDN_SCRATCH20) |= mode_val;
}
/*
* Initialize EC-EFS context.
*/
static void ec_efs_init_(void)
{
if (!board_has_ec_cr50_comm_support())
return;
/*
* If it is a wakeup from deep sleep, then recover some core EC-EFS
* context values, including the boot_mode value, from a PWRD_SCRATCH
* register. Otherwise, reset boot_mode.
*/
if (system_get_reset_flags() & EC_RESET_FLAG_HIBERNATE)
set_boot_mode_(GREG32(PMU, PWRDN_SCRATCH20) & 0xff);
else
ec_efs_reset();
/* TODO(crbug/1020578): Read Hash from Kernel NV Index */
}
DECLARE_HOOK(HOOK_INIT, ec_efs_init_, HOOK_PRIO_DEFAULT);
void ec_efs_reset(void)
{
set_boot_mode_(EC_EFS_BOOT_MODE_NORMAL);
}
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