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drivers: watchdog: implement Smartbond watchdog driver
This patch adds watchdog driver for Renesas Smartbond SOCs. Co-authored-by: Jerzy Kasenberg <[email protected]> Signed-off-by: Ben Lauret <[email protected]>
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‎boards/arm/da1469x_dk_pro/da1469x_dk_pro.dts

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@@ -59,6 +59,7 @@
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aliases {
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led0 = &red_led;
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watchdog0 = &wdog;
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};
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sysclk: system-clock {

‎boards/arm/da1469x_dk_pro/da1469x_dk_pro.yaml

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@@ -10,3 +10,4 @@ toolchain:
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supported:
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- arduino_gpio
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- gpio
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- watchdog

‎drivers/watchdog/CMakeLists.txt

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@@ -29,6 +29,7 @@ zephyr_library_sources_ifdef(CONFIG_WDT_SIFIVE wdt_sifive.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_XEC wdt_mchp_xec.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_COUNTER wdt_counter.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_NXP_S32 wdt_nxp_s32.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_SMARTBOND wdt_smartbond.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_DW wdt_dw.c)
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‎drivers/watchdog/Kconfig

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@@ -96,4 +96,6 @@ source "drivers/watchdog/Kconfig.nxp_s32"
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source "drivers/watchdog/Kconfig.dw"
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source "drivers/watchdog/Kconfig.smartbond"
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endif # WATCHDOG

‎drivers/watchdog/Kconfig.smartbond

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# Smartbond watchdog driver config
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# Copyright (c) 2022 Renesas Electronics Corporation and/or its affiliates
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# SPDX-License-Identifier: Apache-2.0
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config WDT_SMARTBOND
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bool "Watchdog Driver for Smartbond family of MCUs"
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default y
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depends on DT_HAS_RENESAS_SMARTBOND_WATCHDOG_ENABLED
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help
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Enable watchdog driver for Smartbond line of MCUs
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config WDT_SMARTBOND_NMI
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bool "NMI pre-reset interrupt enable"
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default n
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depends on WDT_SMARTBOND
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select RUNTIME_NMI
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help
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Watchdog timer generates NMI at value 0, and WDOG (SYS)
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reset at <= -16. Timer can be frozen/resumed using
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SET_FREEZE_REG[FRZ_WDOG]/RESET_FREEZE_REG[FRZ_WDOG].
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When not set:
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Watchdog timer generates a WDOG (SYS)
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reset at value 0 and can not be frozen by Software.
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Note that this bit can only be set to 1 by SW and
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only be reset with a WDOG (SYS) reset or SW reset.

‎drivers/watchdog/wdt_smartbond.c

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/*
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* Copyright (c) 2022 Renesas Electronics Corporation and/or its affiliates
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <soc.h>
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#include <zephyr/kernel.h>
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#include <zephyr/drivers/watchdog.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(wdog_smartbond, CONFIG_WDT_LOG_LEVEL);
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#define DT_DRV_COMPAT renesas_smartbond_watchdog
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/* driver data */
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struct wdog_smartbond_data {
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/* Reload value calculated in setup */
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uint32_t reload_val;
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#ifdef CONFIG_WDT_SMARTBOND_NMI
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const struct device *wdog_device;
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wdt_callback_t callback;
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#endif
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};
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static struct wdog_smartbond_data wdog_smartbond_dev_data = {};
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static int wdg_smartbond_setup(const struct device *dev, uint8_t options)
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{
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ARG_UNUSED(dev);
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if (options & WDT_OPT_PAUSE_IN_SLEEP) {
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LOG_ERR("Watchdog pause in sleep is not supported");
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return -ENOTSUP;
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}
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return 0;
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}
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static int wdg_smartbond_disable(const struct device *dev)
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{
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ARG_UNUSED(dev);
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if (SYS_WDOG->WATCHDOG_CTRL_REG & SYS_WDOG_WATCHDOG_CTRL_REG_NMI_RST_Msk) {
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/* watchdog cannot be stopped once started when NMI_RST is 1 */
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return -EPERM;
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}
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GPREG->SET_FREEZE_REG = GPREG_SET_FREEZE_REG_FRZ_SYS_WDOG_Msk;
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return 0;
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}
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#ifdef CONFIG_WDT_SMARTBOND_NMI
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extern void z_NmiHandlerSet(void (*pHandler)(void));
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static void wdog_smartbond_nmi_isr(void)
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{
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if (wdog_smartbond_dev_data.callback) {
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wdog_smartbond_dev_data.callback(wdog_smartbond_dev_data.wdog_device, 0);
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}
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}
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#endif /* CONFIG_RUNTIME_NMI */
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static int wdg_smartbond_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 wdog_smartbond_data *data = (struct wdog_smartbond_data *)(dev)->data;
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uint32_t reload_val;
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#ifndef CONFIG_WDT_SMARTBOND_NMI
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if (config->callback != NULL) {
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return -ENOTSUP;
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}
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#endif
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/* For RC32K timer ticks every ~10ms, for RCX ~21ms */
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if (CRG_TOP->CLK_RCX_REG & CRG_TOP_CLK_RCX_REG_RCX_ENABLE_Msk) {
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reload_val = config->window.max / 21;
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} else {
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reload_val = config->window.max / 10;
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}
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if (reload_val < 1 || reload_val >= 0x2000 || config->window.min != 0) {
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/* Out of range supported by watchdog */
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LOG_ERR("Watchdog timeout out of range");
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return -EINVAL;
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}
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#if CONFIG_WDT_SMARTBOND_NMI
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data->callback = config->callback;
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data->wdog_device = dev;
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z_NmiHandlerSet(wdog_smartbond_nmi_isr);
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SYS_WDOG->WATCHDOG_CTRL_REG = 2;
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#else
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SYS_WDOG->WATCHDOG_CTRL_REG = 2 | SYS_WDOG_WATCHDOG_CTRL_REG_NMI_RST_Msk;
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#endif
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data->reload_val = reload_val;
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while (SYS_WDOG->WATCHDOG_CTRL_REG & SYS_WDOG_WATCHDOG_CTRL_REG_WRITE_BUSY_Msk) {
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/* wait */
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}
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SYS_WDOG->WATCHDOG_REG = reload_val;
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return 0;
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}
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static int wdg_smartbond_feed(const struct device *dev, int channel_id)
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{
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struct wdog_smartbond_data *data = (struct wdog_smartbond_data *)(dev)->data;
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ARG_UNUSED(channel_id);
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while (SYS_WDOG->WATCHDOG_CTRL_REG & SYS_WDOG_WATCHDOG_CTRL_REG_WRITE_BUSY_Msk) {
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/* wait */
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}
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SYS_WDOG->WATCHDOG_REG = data->reload_val;
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return 0;
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}
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static const struct wdt_driver_api wdg_smartbond_api = {
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.setup = wdg_smartbond_setup,
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.disable = wdg_smartbond_disable,
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.install_timeout = wdg_smartbond_install_timeout,
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.feed = wdg_smartbond_feed,
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};
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static int wdg_smartbond_init(const struct device *dev)
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{
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ARG_UNUSED(dev);
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#ifdef CONFIG_WDT_DISABLE_AT_BOOT
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GPREG->SET_FREEZE_REG = GPREG_SET_FREEZE_REG_FRZ_SYS_WDOG_Msk;
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#endif
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return 0;
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}
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DEVICE_DT_INST_DEFINE(0, wdg_smartbond_init, NULL, &wdog_smartbond_dev_data, NULL, POST_KERNEL,
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CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &wdg_smartbond_api);

‎dts/arm/renesas/smartbond/da1469x.dtsi

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/*
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* Copyright (c) 2022 Renesas Electronics Corporation
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* Copyright (c) 2022 Renesas Electronics Corporation and/or its affiliates
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* SPDX-License-Identifier: Apache-2.0
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*/
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};
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};
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soc {
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sram0: memory@20000000 {
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compatible = "mmio-sram";
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};
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};
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wdog: watchdog@50000700 {
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compatible = "renesas,smartbond-watchdog";
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reg = <0x50000700 0x8>;
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status = "okay";
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};
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uart: uart@50020000 {
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compatible = "renesas,smartbond-uart";
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reg = <0x50020000 0x100>;

‎dts/bindings/watchdog/renesas,smartbond-watchdog.yaml

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# Copyright (c) 2022 Renesas Electronics Corporation and/or its affiliates
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# SPDX-License-Identifier: Apache-2.0
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description: Smartbond watchdog
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compatible: "renesas,smartbond-watchdog"
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include: base.yaml
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properties:
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reg:
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required: true

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