4  * SPDX-License-Identifier: Apache-2.0
17 #define FWDGT_RELOAD_MAX    (0xFFFU)
34 #define FWDGT_INITIAL_TIMEOUT DT_INST_PROP(0, initial_timeout_ms)
36 #if (FWDGT_INITIAL_TIMEOUT <= 0)
37 #error Must be initial-timeout > 0
41 #error Must be initial-timeout <= (256 * 4095 * 1000 / GD32_LOW_SPEED_IRC_FREQUENCY)
51  * @return 0 on success, -EINVAL if the timeout is out of range
53 static int gd32_fwdgt_calc_timeout(uint32_t timeout, uint32_t *prescaler,  in gd32_fwdgt_calc_timeout()
56 	uint16_t divider = 4U;  in gd32_fwdgt_calc_timeout()  local
57 	uint8_t shift = 0U;  in gd32_fwdgt_calc_timeout()
61 	while ((ticks / divider) > FWDGT_RELOAD_MAX) {  in gd32_fwdgt_calc_timeout()
63 		divider = 4U << shift;  in gd32_fwdgt_calc_timeout()
66 	if (!IS_VALID_FWDGT_PRESCALER(PSC_PSC(shift)) || timeout == 0U) {  in gd32_fwdgt_calc_timeout()
67 		return -EINVAL;  in gd32_fwdgt_calc_timeout()
72 	*reload = (ticks / divider) - 1U;  in gd32_fwdgt_calc_timeout()
74 	return 0;  in gd32_fwdgt_calc_timeout()
77 static int gd32_fwdgt_setup(const struct device *dev, uint8_t options)  in gd32_fwdgt_setup()
81 	if ((options & WDT_OPT_PAUSE_HALTED_BY_DBG) != 0U) {  in gd32_fwdgt_setup()
86 		return -ENOTSUP;  in gd32_fwdgt_setup()
90 	if ((options & WDT_OPT_PAUSE_IN_SLEEP) != 0U) {  in gd32_fwdgt_setup()
92 		return -ENOTSUP;  in gd32_fwdgt_setup()
97 	return 0;  in gd32_fwdgt_setup()
100 static int gd32_fwdgt_disable(const struct device *dev)  in gd32_fwdgt_disable()
105 	return -EPERM;  in gd32_fwdgt_disable()
108 static int gd32_fwdgt_install_timeout(const struct device *dev,  in gd32_fwdgt_install_timeout()
111 	uint32_t prescaler = 0U;  in gd32_fwdgt_install_timeout()
112 	uint32_t reload = 0U;  in gd32_fwdgt_install_timeout()
116 	if (config->callback != NULL) {  in gd32_fwdgt_install_timeout()
118 		return -ENOTSUP;  in gd32_fwdgt_install_timeout()
122 	if (gd32_fwdgt_calc_timeout(config->window.max, &prescaler,  in gd32_fwdgt_install_timeout()
123 				    &reload) != 0) {  in gd32_fwdgt_install_timeout()
125 		return -EINVAL;  in gd32_fwdgt_install_timeout()
133 		return -EINVAL;  in gd32_fwdgt_install_timeout()
137 	return 0;  in gd32_fwdgt_install_timeout()
140 static int gd32_fwdgt_feed(const struct device *dev, int channel_id)  in gd32_fwdgt_feed()
146 	return 0;  in gd32_fwdgt_feed()
156 static int gd32_fwdgt_init(const struct device *dev)  in gd32_fwdgt_init()
158 	int ret = 0;  in gd32_fwdgt_init()
176 DEVICE_DT_INST_DEFINE(0, gd32_fwdgt_init, NULL, NULL, NULL, POST_KERNEL,