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drivers: watchdog: initial device driver for ENE KB1200
Add watchdog driver for ENE KB1200 Signed-off-by: Steven Chang <[email protected]>
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‎drivers/watchdog/CMakeLists.txt

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@@ -41,6 +41,7 @@ zephyr_library_sources_ifdef(CONFIG_WDT_OPENTITAN wdt_opentitan.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_AMBIQ wdt_ambiq.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_XMC4XXX wdt_xmc4xxx.c)
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zephyr_library_sources_ifdef(CONFIG_WWDT_NUMAKER wdt_wwdt_numaker.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_ENE_KB1200 wdt_ene_kb1200.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_DW wdt_dw.c wdt_dw_common.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_INTEL_ADSP wdt_intel_adsp.c wdt_dw_common.c)

‎drivers/watchdog/Kconfig

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@@ -124,4 +124,6 @@ source "drivers/watchdog/Kconfig.xmc4xxx"
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source "drivers/watchdog/Kconfig.numaker"
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source "drivers/watchdog/Kconfig.ene"
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endif # WATCHDOG

‎drivers/watchdog/Kconfig.ene

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# Copyright (c) 2024 ENE Technology Inc.
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# SPDX-License-Identifier: Apache-2.0
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config WDT_ENE_KB1200
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bool "ENE KB1200 watchdog driver"
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default y
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depends on DT_HAS_ENE_KB1200_WATCHDOG_ENABLED
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help
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This option enables the KB1200 watchdog driver.

‎drivers/watchdog/wdt_ene_kb1200.c

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/*
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* Copyright (c) 2024 ENE Technology Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT ene_kb1200_watchdog
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#include <zephyr/irq.h>
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#include <zephyr/kernel.h>
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#include <zephyr/drivers/watchdog.h>
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#include <errno.h>
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#include <reg/wdt.h>
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/* Device config */
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struct wdt_kb1200_config {
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struct wdt_regs *wdt;
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};
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/* Device data */
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struct wdt_kb1200_data {
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wdt_callback_t cb;
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bool timeout_installed;
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};
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/* WDT api functions */
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static int wdt_kb1200_setup(const struct device *dev, uint8_t options)
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{
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struct wdt_kb1200_config const *cfg = dev->config;
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struct wdt_kb1200_data *data = dev->data;
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if (!data->timeout_installed) {
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printk("No valid WDT timeout installed");
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return -EINVAL;
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}
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if (options & WDT_OPT_PAUSE_HALTED_BY_DBG) {
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printk("WDT_OPT_PAUSE_HALTED_BY_DBG is not supported");
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return -ENOTSUP;
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}
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/* Setting Clock Source */
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if (options & WDT_OPT_PAUSE_IN_SLEEP) {
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cfg->wdt->WDTCFG = WDT_ADCO32K;
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} else {
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cfg->wdt->WDTCFG = WDT_PHER32K;
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}
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/* Clear Pending Flag */
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cfg->wdt->WDTPF = (WDT_HALF_WAY_EVENT | WDT_RESET_EVENT);
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/* WDT enable */
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cfg->wdt->WDTCFG |= WDT_FUNCTON_ENABLE;
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return 0;
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}
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static int wdt_kb1200_disable(const struct device *dev)
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{
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struct wdt_kb1200_config const *cfg = dev->config;
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struct wdt_kb1200_data *data = dev->data;
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if (!(cfg->wdt->WDTCFG & WDT_FUNCTON_ENABLE)) {
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return -EALREADY;
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}
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/* WDT disable, write bit 7~4 = 1001b */
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cfg->wdt->WDTCFG = (cfg->wdt->WDTCFG & ~WDT_FUNCTON_ENABLE) | WDT_DISABLE_PASSWORD;
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/* Clear Pending Flag */
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cfg->wdt->WDTPF = (WDT_HALF_WAY_EVENT | WDT_RESET_EVENT);
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/* Need disable IE,or the wdt-half-event interrupt will be entered */
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cfg->wdt->WDTIE &= ~WDT_HALF_WAY_EVENT;
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data->timeout_installed = false;
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return 0;
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}
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static int wdt_kb1200_install_timeout(const struct device *dev,
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const struct wdt_timeout_cfg *config)
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{
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struct wdt_kb1200_config const *cfg = dev->config;
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struct wdt_kb1200_data *data = dev->data;
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/* Watchdog Counter Match Value */
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if (config->window.min > 0U) {
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data->timeout_installed = false;
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return -EINVAL;
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}
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cfg->wdt->WDTM = (config->window.max) / WDT_SAMPLE_TIME;
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/* (HW design) The counter match value must be >= 3 */
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if (cfg->wdt->WDTM < WDT_MIN_CNT) {
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data->timeout_installed = false;
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return -EINVAL;
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}
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/* Watchdog behavior flags */
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if ((config->flags & WDT_FLAG_RESET_MASK) == WDT_FLAG_RESET_SOC) {
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/* Reset: SoC */
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cfg->wdt->WDTCFG_T = WDT_RESET_WHOLE_CHIP_WO_GPIO;
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} else if ((config->flags & WDT_FLAG_RESET_MASK) == WDT_FLAG_RESET_CPU_CORE) {
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/* Reset: CPU core */
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cfg->wdt->WDTCFG_T = WDT_RESET_WHOLE_CHIP;
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} else {
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/* Reset: none */
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cfg->wdt->WDTCFG_T = WDT_RESET_ONLY_MCU;
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}
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/* Watchdog callback function */
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data->cb = config->callback;
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if (data->cb) {
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cfg->wdt->WDTIE |= WDT_HALF_WAY_EVENT;
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} else {
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/* If the callback function is NULL,the SoC will be reset directly.
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* But still need enable interrupt.
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*/
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cfg->wdt->WDTIE |= WDT_HALF_WAY_EVENT;
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}
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data->timeout_installed = true;
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return 0;
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}
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static int wdt_kb1200_feed(const struct device *dev, int channel_id)
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{
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struct wdt_kb1200_config const *cfg = dev->config;
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ARG_UNUSED(dev);
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ARG_UNUSED(channel_id);
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if (!(cfg->wdt->WDTCFG & WDT_FUNCTON_ENABLE)) {
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return -EINVAL;
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}
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/* Re-enable to reset counter */
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cfg->wdt->WDTCFG |= WDT_FUNCTON_ENABLE;
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/* Clear Pending Flag */
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cfg->wdt->WDTPF = WDT_HALF_WAY_EVENT;
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return 0;
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}
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static void wdt_kb1200_isr(const struct device *dev)
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{
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struct wdt_kb1200_data *data = dev->data;
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if (data->cb) {
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data->cb(dev, 0);
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}
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}
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static const struct wdt_driver_api wdt_kb1200_api = {
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.setup = wdt_kb1200_setup,
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.disable = wdt_kb1200_disable,
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.install_timeout = wdt_kb1200_install_timeout,
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.feed = wdt_kb1200_feed,
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};
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static int wdt_kb1200_init(const struct device *dev)
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{
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if (IS_ENABLED(CONFIG_WDT_DISABLE_AT_BOOT)) {
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wdt_kb1200_disable(dev);
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}
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IRQ_CONNECT(DT_INST_IRQN(0), DT_INST_IRQ(0, priority), wdt_kb1200_isr,
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DEVICE_DT_INST_GET(0), 0);
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irq_enable(DT_INST_IRQN(0));
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return 0;
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}
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static const struct wdt_kb1200_config wdt_kb1200_config = {
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.wdt = (struct wdt_regs *)DT_INST_REG_ADDR(0),
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};
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static struct wdt_kb1200_data wdt_kb1200_dev_data;
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DEVICE_DT_INST_DEFINE(0, wdt_kb1200_init, NULL, &wdt_kb1200_dev_data, &wdt_kb1200_config,
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PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &wdt_kb1200_api);

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