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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.
*/
#include <drivers/bbram.h>
#include <logging/log.h>
#include "system.h"
#include "system_chip.h"
LOG_MODULE_REGISTER(shim_npcx_system, LOG_LEVEL_ERR);
static void chip_bbram_status_check(void)
{
const struct device *bbram_dev;
int res;
bbram_dev = DEVICE_DT_GET(DT_NODELABEL(bbram));
if (!device_is_ready(bbram_dev)) {
LOG_ERR("Error: device %s is not ready", bbram_dev->name);
return;
}
res = bbram_check_invalid(bbram_dev);
if (res != 0 && res != -ENOTSUP)
LOG_INF("VBAT power drop!");
res = bbram_check_standby_power(bbram_dev);
if (res != 0 && res != -ENOTSUP)
LOG_INF("VSBY power drop!");
res = bbram_check_power(bbram_dev);
if (res != 0 && res != -ENOTSUP)
LOG_INF("VCC1 power drop!");
}
/*
* Configure address 0x40001600 (Low Power RAM) in the the MPU
* (Memory Protection Unit) as a "regular" memory
*/
void system_mpu_config(void)
{
if (!IS_ENABLED(CONFIG_PLATFORM_EC_WORKAROUND_FLASH_DOWNLOAD_API))
return;
/*
* npcx9 Rev.1 has the problem for download_from_flash API.
* Workaround it by implementing the system_download_from_flash function
* in the suspend RAM. The functions will do the same, but will provide
* a software solution similar to what's done in the npcx5.
*/
/* Enable MPU */
CPU_MPU_CTRL = 0x7;
/* Create a new MPU Region to allow execution from low-power ram */
CPU_MPU_RNR = REGION_CHIP_RESERVED;
CPU_MPU_RASR = CPU_MPU_RASR & 0xFFFFFFFE; /* Disable region */
CPU_MPU_RBAR = CONFIG_LPRAM_BASE; /* Set region base address */
/*
* Set region size & attribute and enable region
* [31:29] - Reserved.
* [28] - XN (Execute Never) = 0
* [27] - Reserved.
* [26:24] - AP = 011 (Full access)
* [23:22] - Reserved.
* [21:19,18,17,16] - TEX,S,C,B = 001000 (Normal memory)
* [15:8] - SRD = 0 (Subregions enabled)
* [7:6] - Reserved.
* [5:1] - SIZE = 01001 (1K)
* [0] - ENABLE = 1 (enabled)
*/
CPU_MPU_RASR = 0x03080013;
}
static int chip_system_init(const struct device *unused)
{
ARG_UNUSED(unused);
/*
* Check BBRAM power status.
*/
chip_bbram_status_check();
system_mpu_config();
return 0;
}
/*
* The priority should be lower than CROS_BBRAM_NPCX_INIT_PRIORITY.
*/
#if (CONFIG_CROS_SYSTEM_NPCX_PRE_INIT_PRIORITY <= CONFIG_BBRAM_INIT_PRIORITY)
#error CONFIG_CROS_SYSTEM_NPCX_PRE_INIT_PRIORITY must greater than \
CONFIG_BBRAM_INIT_PRIORITY
#endif
SYS_INIT(chip_system_init, PRE_KERNEL_1,
CONFIG_CROS_SYSTEM_NPCX_PRE_INIT_PRIORITY);
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