124 lines
2.2 KiB
C
124 lines
2.2 KiB
C
/*
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* Copyright (c) 2022 Andes Technology Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/device.h>
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#include <zephyr/drivers/hwinfo.h>
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#include <zephyr/drivers/syscon.h>
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#include <string.h>
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#include <zephyr/sys/byteorder.h>
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/*
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* SMU(System Management Unit) Registers for hwinfo driver
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*/
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/* Register offset*/
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#define SMU_SYSTEMVER 0x00
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#define SMU_WRSR 0x10
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/* Wake-Up and Reset Status Register bitmask */
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#define SMU_WRSR_APOR BIT(0)
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#define SMU_WRSR_MPOR BIT(1)
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#define SMU_WRSR_HW BIT(2)
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#define SMU_WRSR_WDT BIT(3)
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#define SMU_WRSR_SW BIT(4)
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#define ANDES_RESET_STATUS_MASK BIT_MASK(5)
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static const struct device *const syscon_dev =
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DEVICE_DT_GET(DT_NODELABEL(syscon));
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ssize_t z_impl_hwinfo_get_device_id(uint8_t *buffer, size_t length)
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{
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int ret = 0;
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uint8_t id[3];
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uint32_t ver;
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if (!device_is_ready(syscon_dev)) {
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return -ENODEV;
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}
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ret = syscon_read_reg(syscon_dev, SMU_SYSTEMVER, &ver);
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if (ret < 0) {
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return ret;
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}
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if (length > sizeof(id)) {
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length = sizeof(id);
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}
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sys_put_le24(ver, id);
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memcpy(buffer, id, length);
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return length;
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}
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int z_impl_hwinfo_get_reset_cause(uint32_t *cause)
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{
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int ret = 0;
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uint32_t reason, flags = 0;
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if (!device_is_ready(syscon_dev)) {
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return -ENODEV;
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}
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ret = syscon_read_reg(syscon_dev, SMU_WRSR, &reason);
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if (ret < 0) {
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return ret;
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}
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if (reason & SMU_WRSR_APOR) {
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flags |= RESET_POR;
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}
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if (reason & SMU_WRSR_MPOR) {
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flags |= RESET_POR;
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}
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if (reason & SMU_WRSR_HW) {
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flags |= RESET_PIN;
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}
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if (reason & SMU_WRSR_WDT) {
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flags |= RESET_WATCHDOG;
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}
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if (reason & SMU_WRSR_SW) {
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flags |= RESET_SOFTWARE;
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}
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*cause = flags;
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return 0;
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}
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int z_impl_hwinfo_clear_reset_cause(void)
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{
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int ret = 0;
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uint32_t reason;
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if (!device_is_ready(syscon_dev)) {
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return -ENODEV;
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}
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ret = syscon_write_reg(syscon_dev, SMU_WRSR, ANDES_RESET_STATUS_MASK);
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if (ret < 0) {
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return ret;
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}
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do {
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ret = syscon_read_reg(syscon_dev, SMU_WRSR, &reason);
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} while ((reason & ANDES_RESET_STATUS_MASK) && (!ret));
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return ret;
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}
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int z_impl_hwinfo_get_supported_reset_cause(uint32_t *supported)
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{
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*supported = (RESET_PIN
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| RESET_WATCHDOG
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| RESET_SOFTWARE
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| RESET_POR);
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return 0;
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}
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