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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright 2018-2019 NXP.
4 */
5
6#include <linux/arm-smccc.h>
7#include <linux/firmware/imx/sci.h>
8#include <linux/io.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/moduleparam.h>
12#include <linux/of.h>
13#include <linux/platform_device.h>
14#include <linux/watchdog.h>
15
16#define DEFAULT_TIMEOUT 60
17/*
18 * Software timer tick implemented in scfw side, support 10ms to 0xffffffff ms
19 * in theory, but for normal case, 1s~128s is enough, you can change this max
20 * value in case it's not enough.
21 */
22#define MAX_TIMEOUT 128
23
24#define IMX_SIP_TIMER 0xC2000002
25#define IMX_SIP_TIMER_START_WDOG 0x01
26#define IMX_SIP_TIMER_STOP_WDOG 0x02
27#define IMX_SIP_TIMER_SET_WDOG_ACT 0x03
28#define IMX_SIP_TIMER_PING_WDOG 0x04
29#define IMX_SIP_TIMER_SET_TIMEOUT_WDOG 0x05
30#define IMX_SIP_TIMER_GET_WDOG_STAT 0x06
31#define IMX_SIP_TIMER_SET_PRETIME_WDOG 0x07
32
33#define SC_TIMER_WDOG_ACTION_PARTITION 0
34
35#define SC_IRQ_WDOG 1
36#define SC_IRQ_GROUP_WDOG 1
37#define SC_TIMER_ERR_BUSY 10
38
39static bool nowayout = WATCHDOG_NOWAYOUT;
40module_param(nowayout, bool, 0000);
41MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
42 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
43
44struct imx_sc_wdt_device {
45 struct watchdog_device wdd;
46 struct notifier_block wdt_notifier;
47};
48
49static int imx_sc_wdt_ping(struct watchdog_device *wdog)
50{
51 struct arm_smccc_res res;
52
53 arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_PING_WDOG,
54 0, 0, 0, 0, 0, 0, &res);
55
56 return 0;
57}
58
59static int imx_sc_wdt_start(struct watchdog_device *wdog)
60{
61 struct arm_smccc_res res;
62
63 arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_START_WDOG,
64 0, 0, 0, 0, 0, 0, &res);
65
66 /* Ignore if already enabled(SC_TIMER_ERR_BUSY) */
67 if (res.a0 && res.a0 != SC_TIMER_ERR_BUSY)
68 return -EACCES;
69
70 arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_WDOG_ACT,
71 SC_TIMER_WDOG_ACTION_PARTITION,
72 0, 0, 0, 0, 0, &res);
73 return res.a0 ? -EACCES : 0;
74}
75
76static int imx_sc_wdt_stop(struct watchdog_device *wdog)
77{
78 struct arm_smccc_res res;
79
80 arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_STOP_WDOG,
81 0, 0, 0, 0, 0, 0, &res);
82
83 return res.a0 ? -EACCES : 0;
84}
85
86static int imx_sc_wdt_set_timeout(struct watchdog_device *wdog,
87 unsigned int timeout)
88{
89 struct arm_smccc_res res;
90
91 wdog->timeout = timeout;
92 arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_TIMEOUT_WDOG,
93 timeout * 1000, 0, 0, 0, 0, 0, &res);
94
95 return res.a0 ? -EACCES : 0;
96}
97
98static int imx_sc_wdt_set_pretimeout(struct watchdog_device *wdog,
99 unsigned int pretimeout)
100{
101 struct arm_smccc_res res;
102
103 /*
104 * SCU firmware calculates pretimeout based on current time
105 * stamp instead of watchdog timeout stamp, need to convert
106 * the pretimeout to SCU firmware's timeout value.
107 */
108 arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_PRETIME_WDOG,
109 (wdog->timeout - pretimeout) * 1000, 0, 0, 0,
110 0, 0, &res);
111 if (res.a0)
112 return -EACCES;
113
114 wdog->pretimeout = pretimeout;
115
116 return 0;
117}
118
119static int imx_sc_wdt_notify(struct notifier_block *nb,
120 unsigned long event, void *group)
121{
122 struct imx_sc_wdt_device *imx_sc_wdd =
123 container_of(nb,
124 struct imx_sc_wdt_device,
125 wdt_notifier);
126
127 if (event & SC_IRQ_WDOG &&
128 *(u8 *)group == SC_IRQ_GROUP_WDOG)
129 watchdog_notify_pretimeout(&imx_sc_wdd->wdd);
130
131 return 0;
132}
133
134static void imx_sc_wdt_action(void *data)
135{
136 struct notifier_block *wdt_notifier = data;
137
138 imx_scu_irq_unregister_notifier(wdt_notifier);
139 imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
140 SC_IRQ_WDOG,
141 false);
142}
143
144static const struct watchdog_ops imx_sc_wdt_ops = {
145 .owner = THIS_MODULE,
146 .start = imx_sc_wdt_start,
147 .stop = imx_sc_wdt_stop,
148 .ping = imx_sc_wdt_ping,
149 .set_timeout = imx_sc_wdt_set_timeout,
150 .set_pretimeout = imx_sc_wdt_set_pretimeout,
151};
152
153static struct watchdog_info imx_sc_wdt_info = {
154 .identity = "i.MX SC watchdog timer",
155 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
156 WDIOF_MAGICCLOSE,
157};
158
159static int imx_sc_wdt_probe(struct platform_device *pdev)
160{
161 struct imx_sc_wdt_device *imx_sc_wdd;
162 struct watchdog_device *wdog;
163 struct device *dev = &pdev->dev;
164 int ret;
165
166 imx_sc_wdd = devm_kzalloc(dev, sizeof(*imx_sc_wdd), GFP_KERNEL);
167 if (!imx_sc_wdd)
168 return -ENOMEM;
169
170 platform_set_drvdata(pdev, imx_sc_wdd);
171
172 wdog = &imx_sc_wdd->wdd;
173 wdog->info = &imx_sc_wdt_info;
174 wdog->ops = &imx_sc_wdt_ops;
175 wdog->min_timeout = 1;
176 wdog->max_timeout = MAX_TIMEOUT;
177 wdog->parent = dev;
178 wdog->timeout = DEFAULT_TIMEOUT;
179
180 watchdog_init_timeout(wdog, 0, dev);
181
182 ret = imx_sc_wdt_set_timeout(wdog, wdog->timeout);
183 if (ret)
184 return ret;
185
186 watchdog_stop_on_reboot(wdog);
187 watchdog_stop_on_unregister(wdog);
188
189 ret = imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
190 SC_IRQ_WDOG,
191 true);
192 if (ret) {
193 dev_warn(dev, "Enable irq failed, pretimeout NOT supported\n");
194 goto register_device;
195 }
196
197 imx_sc_wdd->wdt_notifier.notifier_call = imx_sc_wdt_notify;
198 ret = imx_scu_irq_register_notifier(&imx_sc_wdd->wdt_notifier);
199 if (ret) {
200 imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
201 SC_IRQ_WDOG,
202 false);
203 dev_warn(dev,
204 "Register irq notifier failed, pretimeout NOT supported\n");
205 goto register_device;
206 }
207
208 ret = devm_add_action_or_reset(dev, imx_sc_wdt_action,
209 &imx_sc_wdd->wdt_notifier);
210 if (!ret)
211 imx_sc_wdt_info.options |= WDIOF_PRETIMEOUT;
212 else
213 dev_warn(dev, "Add action failed, pretimeout NOT supported\n");
214
215register_device:
216 return devm_watchdog_register_device(dev, wdog);
217}
218
219static int __maybe_unused imx_sc_wdt_suspend(struct device *dev)
220{
221 struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
222
223 if (watchdog_active(&imx_sc_wdd->wdd))
224 imx_sc_wdt_stop(&imx_sc_wdd->wdd);
225
226 return 0;
227}
228
229static int __maybe_unused imx_sc_wdt_resume(struct device *dev)
230{
231 struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
232
233 if (watchdog_active(&imx_sc_wdd->wdd))
234 imx_sc_wdt_start(&imx_sc_wdd->wdd);
235
236 return 0;
237}
238
239static SIMPLE_DEV_PM_OPS(imx_sc_wdt_pm_ops,
240 imx_sc_wdt_suspend, imx_sc_wdt_resume);
241
242static const struct of_device_id imx_sc_wdt_dt_ids[] = {
243 { .compatible = "fsl,imx-sc-wdt", },
244 { /* sentinel */ }
245};
246MODULE_DEVICE_TABLE(of, imx_sc_wdt_dt_ids);
247
248static struct platform_driver imx_sc_wdt_driver = {
249 .probe = imx_sc_wdt_probe,
250 .driver = {
251 .name = "imx-sc-wdt",
252 .of_match_table = imx_sc_wdt_dt_ids,
253 .pm = &imx_sc_wdt_pm_ops,
254 },
255};
256module_platform_driver(imx_sc_wdt_driver);
257
258MODULE_AUTHOR("Robin Gong <yibin.gong@nxp.com>");
259MODULE_DESCRIPTION("NXP i.MX system controller watchdog driver");
260MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright 2018-2019 NXP.
4 */
5
6#include <linux/arm-smccc.h>
7#include <linux/firmware/imx/sci.h>
8#include <linux/io.h>
9#include <linux/init.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/moduleparam.h>
13#include <linux/of.h>
14#include <linux/platform_device.h>
15#include <linux/reboot.h>
16#include <linux/watchdog.h>
17
18#define DEFAULT_TIMEOUT 60
19/*
20 * Software timer tick implemented in scfw side, support 10ms to 0xffffffff ms
21 * in theory, but for normal case, 1s~128s is enough, you can change this max
22 * value in case it's not enough.
23 */
24#define MAX_TIMEOUT 128
25
26#define IMX_SIP_TIMER 0xC2000002
27#define IMX_SIP_TIMER_START_WDOG 0x01
28#define IMX_SIP_TIMER_STOP_WDOG 0x02
29#define IMX_SIP_TIMER_SET_WDOG_ACT 0x03
30#define IMX_SIP_TIMER_PING_WDOG 0x04
31#define IMX_SIP_TIMER_SET_TIMEOUT_WDOG 0x05
32#define IMX_SIP_TIMER_GET_WDOG_STAT 0x06
33#define IMX_SIP_TIMER_SET_PRETIME_WDOG 0x07
34
35#define SC_TIMER_WDOG_ACTION_PARTITION 0
36
37#define SC_IRQ_WDOG 1
38#define SC_IRQ_GROUP_WDOG 1
39
40static bool nowayout = WATCHDOG_NOWAYOUT;
41module_param(nowayout, bool, 0000);
42MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
43 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
44
45struct imx_sc_wdt_device {
46 struct watchdog_device wdd;
47 struct notifier_block wdt_notifier;
48};
49
50static int imx_sc_wdt_ping(struct watchdog_device *wdog)
51{
52 struct arm_smccc_res res;
53
54 arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_PING_WDOG,
55 0, 0, 0, 0, 0, 0, &res);
56
57 return 0;
58}
59
60static int imx_sc_wdt_start(struct watchdog_device *wdog)
61{
62 struct arm_smccc_res res;
63
64 arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_START_WDOG,
65 0, 0, 0, 0, 0, 0, &res);
66 if (res.a0)
67 return -EACCES;
68
69 arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_WDOG_ACT,
70 SC_TIMER_WDOG_ACTION_PARTITION,
71 0, 0, 0, 0, 0, &res);
72 return res.a0 ? -EACCES : 0;
73}
74
75static int imx_sc_wdt_stop(struct watchdog_device *wdog)
76{
77 struct arm_smccc_res res;
78
79 arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_STOP_WDOG,
80 0, 0, 0, 0, 0, 0, &res);
81
82 return res.a0 ? -EACCES : 0;
83}
84
85static int imx_sc_wdt_set_timeout(struct watchdog_device *wdog,
86 unsigned int timeout)
87{
88 struct arm_smccc_res res;
89
90 wdog->timeout = timeout;
91 arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_TIMEOUT_WDOG,
92 timeout * 1000, 0, 0, 0, 0, 0, &res);
93
94 return res.a0 ? -EACCES : 0;
95}
96
97static int imx_sc_wdt_set_pretimeout(struct watchdog_device *wdog,
98 unsigned int pretimeout)
99{
100 struct arm_smccc_res res;
101
102 /*
103 * SCU firmware calculates pretimeout based on current time
104 * stamp instead of watchdog timeout stamp, need to convert
105 * the pretimeout to SCU firmware's timeout value.
106 */
107 arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_PRETIME_WDOG,
108 (wdog->timeout - pretimeout) * 1000, 0, 0, 0,
109 0, 0, &res);
110 if (res.a0)
111 return -EACCES;
112
113 wdog->pretimeout = pretimeout;
114
115 return 0;
116}
117
118static int imx_sc_wdt_notify(struct notifier_block *nb,
119 unsigned long event, void *group)
120{
121 struct imx_sc_wdt_device *imx_sc_wdd =
122 container_of(nb,
123 struct imx_sc_wdt_device,
124 wdt_notifier);
125
126 if (event & SC_IRQ_WDOG &&
127 *(u8 *)group == SC_IRQ_GROUP_WDOG)
128 watchdog_notify_pretimeout(&imx_sc_wdd->wdd);
129
130 return 0;
131}
132
133static void imx_sc_wdt_action(void *data)
134{
135 struct notifier_block *wdt_notifier = data;
136
137 imx_scu_irq_unregister_notifier(wdt_notifier);
138 imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
139 SC_IRQ_WDOG,
140 false);
141}
142
143static const struct watchdog_ops imx_sc_wdt_ops = {
144 .owner = THIS_MODULE,
145 .start = imx_sc_wdt_start,
146 .stop = imx_sc_wdt_stop,
147 .ping = imx_sc_wdt_ping,
148 .set_timeout = imx_sc_wdt_set_timeout,
149 .set_pretimeout = imx_sc_wdt_set_pretimeout,
150};
151
152static struct watchdog_info imx_sc_wdt_info = {
153 .identity = "i.MX SC watchdog timer",
154 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
155 WDIOF_MAGICCLOSE,
156};
157
158static int imx_sc_wdt_probe(struct platform_device *pdev)
159{
160 struct imx_sc_wdt_device *imx_sc_wdd;
161 struct watchdog_device *wdog;
162 struct device *dev = &pdev->dev;
163 int ret;
164
165 imx_sc_wdd = devm_kzalloc(dev, sizeof(*imx_sc_wdd), GFP_KERNEL);
166 if (!imx_sc_wdd)
167 return -ENOMEM;
168
169 platform_set_drvdata(pdev, imx_sc_wdd);
170
171 wdog = &imx_sc_wdd->wdd;
172 wdog->info = &imx_sc_wdt_info;
173 wdog->ops = &imx_sc_wdt_ops;
174 wdog->min_timeout = 1;
175 wdog->max_timeout = MAX_TIMEOUT;
176 wdog->parent = dev;
177 wdog->timeout = DEFAULT_TIMEOUT;
178
179 watchdog_init_timeout(wdog, 0, dev);
180 watchdog_stop_on_reboot(wdog);
181 watchdog_stop_on_unregister(wdog);
182
183 ret = devm_watchdog_register_device(dev, wdog);
184 if (ret)
185 return ret;
186
187 ret = imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
188 SC_IRQ_WDOG,
189 true);
190 if (ret) {
191 dev_warn(dev, "Enable irq failed, pretimeout NOT supported\n");
192 return 0;
193 }
194
195 imx_sc_wdd->wdt_notifier.notifier_call = imx_sc_wdt_notify;
196 ret = imx_scu_irq_register_notifier(&imx_sc_wdd->wdt_notifier);
197 if (ret) {
198 imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
199 SC_IRQ_WDOG,
200 false);
201 dev_warn(dev,
202 "Register irq notifier failed, pretimeout NOT supported\n");
203 return 0;
204 }
205
206 ret = devm_add_action_or_reset(dev, imx_sc_wdt_action,
207 &imx_sc_wdd->wdt_notifier);
208 if (!ret)
209 imx_sc_wdt_info.options |= WDIOF_PRETIMEOUT;
210 else
211 dev_warn(dev, "Add action failed, pretimeout NOT supported\n");
212
213 return 0;
214}
215
216static int __maybe_unused imx_sc_wdt_suspend(struct device *dev)
217{
218 struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
219
220 if (watchdog_active(&imx_sc_wdd->wdd))
221 imx_sc_wdt_stop(&imx_sc_wdd->wdd);
222
223 return 0;
224}
225
226static int __maybe_unused imx_sc_wdt_resume(struct device *dev)
227{
228 struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
229
230 if (watchdog_active(&imx_sc_wdd->wdd))
231 imx_sc_wdt_start(&imx_sc_wdd->wdd);
232
233 return 0;
234}
235
236static SIMPLE_DEV_PM_OPS(imx_sc_wdt_pm_ops,
237 imx_sc_wdt_suspend, imx_sc_wdt_resume);
238
239static const struct of_device_id imx_sc_wdt_dt_ids[] = {
240 { .compatible = "fsl,imx-sc-wdt", },
241 { /* sentinel */ }
242};
243MODULE_DEVICE_TABLE(of, imx_sc_wdt_dt_ids);
244
245static struct platform_driver imx_sc_wdt_driver = {
246 .probe = imx_sc_wdt_probe,
247 .driver = {
248 .name = "imx-sc-wdt",
249 .of_match_table = imx_sc_wdt_dt_ids,
250 .pm = &imx_sc_wdt_pm_ops,
251 },
252};
253module_platform_driver(imx_sc_wdt_driver);
254
255MODULE_AUTHOR("Robin Gong <yibin.gong@nxp.com>");
256MODULE_DESCRIPTION("NXP i.MX system controller watchdog driver");
257MODULE_LICENSE("GPL v2");