1 /*
2 * Copyright (c) 2020, Jiri Kerestes
3 *
4 * Based on wdt_mcux_wdog32.c, which is:
5 * Copyright (c) 2019 Vestas Wind Systems A/S
6 * Copyright (c) 2018, NXP
7 *
8 * SPDX-License-Identifier: Apache-2.0
9 */
10
11 #define DT_DRV_COMPAT nxp_lpc_wwdt
12
13 #include <zephyr/drivers/watchdog.h>
14 #include <zephyr/irq.h>
15 #include <zephyr/sys_clock.h>
16 #include <fsl_wwdt.h>
17 #include <fsl_clock.h>
18
19 #define LOG_LEVEL CONFIG_WDT_LOG_LEVEL
20 #include <zephyr/logging/log.h>
21 LOG_MODULE_REGISTER(wdt_mcux_wwdt);
22
23 #define MIN_TIMEOUT 0xFF
24
25 struct mcux_wwdt_config {
26 WWDT_Type *base;
27 uint8_t clk_divider;
28 void (*irq_config_func)(const struct device *dev);
29 };
30
31 struct mcux_wwdt_data {
32 wdt_callback_t callback;
33 wwdt_config_t wwdt_config;
34 bool timeout_valid;
35 };
36
mcux_wwdt_setup(const struct device * dev,uint8_t options)37 static int mcux_wwdt_setup(const struct device *dev, uint8_t options)
38 {
39 const struct mcux_wwdt_config *config = dev->config;
40 struct mcux_wwdt_data *data = dev->data;
41 WWDT_Type *base = config->base;
42
43 if (!data->timeout_valid) {
44 LOG_ERR("No valid timeouts installed");
45 return -EINVAL;
46 }
47
48 WWDT_Init(base, &data->wwdt_config);
49 LOG_DBG("Setup the watchdog");
50
51 return 0;
52 }
53
mcux_wwdt_disable(const struct device * dev)54 static int mcux_wwdt_disable(const struct device *dev)
55 {
56 const struct mcux_wwdt_config *config = dev->config;
57 struct mcux_wwdt_data *data = dev->data;
58 WWDT_Type *base = config->base;
59
60 WWDT_Deinit(base);
61 data->timeout_valid = false;
62 LOG_DBG("Disabled the watchdog");
63
64 return 0;
65 }
66
67 /*
68 * LPC55xxx WWDT has a fixed divide-by-4 clock prescaler.
69 * This prescaler is different from the clock divider specified in Device Tree.
70 */
71 #define MSEC_TO_WWDT_TICKS(clock_freq, msec) \
72 ((uint32_t)((clock_freq / MSEC_PER_SEC) * msec) / 4)
73
mcux_wwdt_install_timeout(const struct device * dev,const struct wdt_timeout_cfg * cfg)74 static int mcux_wwdt_install_timeout(const struct device *dev,
75 const struct wdt_timeout_cfg *cfg)
76 {
77 struct mcux_wwdt_data *data = dev->data;
78 uint32_t clock_freq;
79
80 if (data->timeout_valid) {
81 LOG_ERR("No more timeouts can be installed");
82 return -ENOMEM;
83 }
84
85 #if defined(CONFIG_SOC_MIMXRT685S_CM33) || defined(CONFIG_SOC_MIMXRT595S_CM33) \
86 || defined(CONFIG_SOC_SERIES_MCXN)
87 clock_freq = CLOCK_GetWdtClkFreq(0);
88 #elif defined(CONFIG_SOC_SERIES_RW6XX)
89 clock_freq = CLOCK_GetWdtClkFreq();
90 #else
91 const struct mcux_wwdt_config *config = dev->config;
92
93 CLOCK_SetClkDiv(kCLOCK_DivWdtClk, config->clk_divider, true);
94 clock_freq = CLOCK_GetWdtClkFreq();
95 #endif
96
97 WWDT_GetDefaultConfig(&data->wwdt_config);
98
99 data->wwdt_config.clockFreq_Hz = clock_freq;
100
101 data->wwdt_config.timeoutValue =
102 MSEC_TO_WWDT_TICKS(clock_freq, cfg->window.max);
103
104 if (cfg->window.min) {
105 data->wwdt_config.windowValue =
106 MSEC_TO_WWDT_TICKS(clock_freq, cfg->window.min);
107 }
108
109 if ((data->wwdt_config.timeoutValue < MIN_TIMEOUT) ||
110 ((data->wwdt_config.windowValue != 0xFFFFFFU) &&
111 (data->wwdt_config.timeoutValue <
112 data->wwdt_config.windowValue))) {
113 return -EINVAL;
114 }
115
116 if (cfg->flags & WDT_FLAG_RESET_SOC) {
117 data->wwdt_config.enableWatchdogReset = true;
118 LOG_DBG("Enabling SoC reset");
119 }
120
121 if (cfg->callback && (CONFIG_WDT_MCUX_WWDT_WARNING_INTERRUPT_CFG > 0)) {
122 data->callback = cfg->callback;
123 data->wwdt_config.warningValue = CONFIG_WDT_MCUX_WWDT_WARNING_INTERRUPT_CFG;
124 } else if (cfg->callback) {
125 return -ENOTSUP;
126 }
127
128
129 data->timeout_valid = true;
130 LOG_DBG("Installed timeout (timeoutValue = %d)",
131 data->wwdt_config.timeoutValue);
132
133 return 0;
134 }
135
mcux_wwdt_feed(const struct device * dev,int channel_id)136 static int mcux_wwdt_feed(const struct device *dev, int channel_id)
137 {
138 const struct mcux_wwdt_config *config = dev->config;
139 WWDT_Type *base = config->base;
140
141 if (channel_id != 0) {
142 LOG_ERR("Invalid channel id");
143 return -EINVAL;
144 }
145
146 WWDT_Refresh(base);
147 LOG_DBG("Fed the watchdog");
148
149 return 0;
150 }
151
mcux_wwdt_isr(const struct device * dev)152 static void mcux_wwdt_isr(const struct device *dev)
153 {
154 const struct mcux_wwdt_config *config = dev->config;
155 struct mcux_wwdt_data *data = dev->data;
156 WWDT_Type *base = config->base;
157 uint32_t flags;
158
159 flags = WWDT_GetStatusFlags(base);
160 WWDT_ClearStatusFlags(base, flags);
161
162 if (data->callback) {
163 data->callback(dev, 0);
164 }
165 }
166
mcux_wwdt_init(const struct device * dev)167 static int mcux_wwdt_init(const struct device *dev)
168 {
169 const struct mcux_wwdt_config *config = dev->config;
170
171 config->irq_config_func(dev);
172
173 return 0;
174 }
175
176 static DEVICE_API(wdt, mcux_wwdt_api) = {
177 .setup = mcux_wwdt_setup,
178 .disable = mcux_wwdt_disable,
179 .install_timeout = mcux_wwdt_install_timeout,
180 .feed = mcux_wwdt_feed,
181 };
182
183 static void mcux_wwdt_config_func_0(const struct device *dev);
184
185 static const struct mcux_wwdt_config mcux_wwdt_config_0 = {
186 .base = (WWDT_Type *) DT_INST_REG_ADDR(0),
187 .clk_divider =
188 DT_INST_PROP(0, clk_divider),
189 .irq_config_func = mcux_wwdt_config_func_0,
190 };
191
192 static struct mcux_wwdt_data mcux_wwdt_data_0;
193
194 DEVICE_DT_INST_DEFINE(0, &mcux_wwdt_init,
195 NULL, &mcux_wwdt_data_0,
196 &mcux_wwdt_config_0, POST_KERNEL,
197 CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
198 &mcux_wwdt_api);
199
mcux_wwdt_config_func_0(const struct device * dev)200 static void mcux_wwdt_config_func_0(const struct device *dev)
201 {
202 IRQ_CONNECT(DT_INST_IRQN(0),
203 DT_INST_IRQ(0, priority),
204 mcux_wwdt_isr, DEVICE_DT_INST_GET(0), 0);
205
206 irq_enable(DT_INST_IRQN(0));
207 }
208
