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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2016 National Instruments Corp.
4 */
5
6#include <linux/acpi.h>
7#include <linux/bitops.h>
8#include <linux/device.h>
9#include <linux/io.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/watchdog.h>
13
14#define LOCK 0xA5
15#define UNLOCK 0x5A
16
17#define WDT_CTRL_RESET_EN BIT(7)
18#define WDT_RELOAD_PORT_EN BIT(7)
19
20#define WDT_CTRL 1
21#define WDT_RELOAD_CTRL 2
22#define WDT_PRESET_PRESCALE 4
23#define WDT_REG_LOCK 5
24#define WDT_COUNT 6
25#define WDT_RELOAD_PORT 7
26
27#define WDT_MIN_TIMEOUT 1
28#define WDT_MAX_TIMEOUT 464
29#define WDT_DEFAULT_TIMEOUT 80
30
31#define WDT_MAX_COUNTER 15
32
33static unsigned int timeout;
34module_param(timeout, uint, 0);
35MODULE_PARM_DESC(timeout,
36 "Watchdog timeout in seconds. (default="
37 __MODULE_STRING(WDT_DEFAULT_TIMEOUT) ")");
38
39static bool nowayout = WATCHDOG_NOWAYOUT;
40module_param(nowayout, bool, 0);
41MODULE_PARM_DESC(nowayout,
42 "Watchdog cannot be stopped once started. (default="
43 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
44
45struct nic7018_wdt {
46 u16 io_base;
47 u32 period;
48 struct watchdog_device wdd;
49};
50
51struct nic7018_config {
52 u32 period;
53 u8 divider;
54};
55
56static const struct nic7018_config nic7018_configs[] = {
57 { 2, 4 },
58 { 32, 5 },
59};
60
61static inline u32 nic7018_timeout(u32 period, u8 counter)
62{
63 return period * counter - period / 2;
64}
65
66static const struct nic7018_config *nic7018_get_config(u32 timeout,
67 u8 *counter)
68{
69 const struct nic7018_config *config;
70 u8 count;
71
72 if (timeout < 30 && timeout != 16) {
73 config = &nic7018_configs[0];
74 count = timeout / 2 + 1;
75 } else {
76 config = &nic7018_configs[1];
77 count = DIV_ROUND_UP(timeout + 16, 32);
78
79 if (count > WDT_MAX_COUNTER)
80 count = WDT_MAX_COUNTER;
81 }
82 *counter = count;
83 return config;
84}
85
86static int nic7018_set_timeout(struct watchdog_device *wdd,
87 unsigned int timeout)
88{
89 struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
90 const struct nic7018_config *config;
91 u8 counter;
92
93 config = nic7018_get_config(timeout, &counter);
94
95 outb(counter << 4 | config->divider,
96 wdt->io_base + WDT_PRESET_PRESCALE);
97
98 wdd->timeout = nic7018_timeout(config->period, counter);
99 wdt->period = config->period;
100
101 return 0;
102}
103
104static int nic7018_start(struct watchdog_device *wdd)
105{
106 struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
107 u8 control;
108
109 nic7018_set_timeout(wdd, wdd->timeout);
110
111 control = inb(wdt->io_base + WDT_RELOAD_CTRL);
112 outb(control | WDT_RELOAD_PORT_EN, wdt->io_base + WDT_RELOAD_CTRL);
113
114 outb(1, wdt->io_base + WDT_RELOAD_PORT);
115
116 control = inb(wdt->io_base + WDT_CTRL);
117 outb(control | WDT_CTRL_RESET_EN, wdt->io_base + WDT_CTRL);
118
119 return 0;
120}
121
122static int nic7018_stop(struct watchdog_device *wdd)
123{
124 struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
125
126 outb(0, wdt->io_base + WDT_CTRL);
127 outb(0, wdt->io_base + WDT_RELOAD_CTRL);
128 outb(0xF0, wdt->io_base + WDT_PRESET_PRESCALE);
129
130 return 0;
131}
132
133static int nic7018_ping(struct watchdog_device *wdd)
134{
135 struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
136
137 outb(1, wdt->io_base + WDT_RELOAD_PORT);
138
139 return 0;
140}
141
142static unsigned int nic7018_get_timeleft(struct watchdog_device *wdd)
143{
144 struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
145 u8 count;
146
147 count = inb(wdt->io_base + WDT_COUNT) & 0xF;
148 if (!count)
149 return 0;
150
151 return nic7018_timeout(wdt->period, count);
152}
153
154static const struct watchdog_info nic7018_wdd_info = {
155 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
156 .identity = "NIC7018 Watchdog",
157};
158
159static const struct watchdog_ops nic7018_wdd_ops = {
160 .owner = THIS_MODULE,
161 .start = nic7018_start,
162 .stop = nic7018_stop,
163 .ping = nic7018_ping,
164 .set_timeout = nic7018_set_timeout,
165 .get_timeleft = nic7018_get_timeleft,
166};
167
168static int nic7018_probe(struct platform_device *pdev)
169{
170 struct device *dev = &pdev->dev;
171 struct watchdog_device *wdd;
172 struct nic7018_wdt *wdt;
173 struct resource *io_rc;
174 int ret;
175
176 wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
177 if (!wdt)
178 return -ENOMEM;
179
180 platform_set_drvdata(pdev, wdt);
181
182 io_rc = platform_get_resource(pdev, IORESOURCE_IO, 0);
183 if (!io_rc) {
184 dev_err(dev, "missing IO resources\n");
185 return -EINVAL;
186 }
187
188 if (!devm_request_region(dev, io_rc->start, resource_size(io_rc),
189 KBUILD_MODNAME)) {
190 dev_err(dev, "failed to get IO region\n");
191 return -EBUSY;
192 }
193
194 wdt->io_base = io_rc->start;
195 wdd = &wdt->wdd;
196 wdd->info = &nic7018_wdd_info;
197 wdd->ops = &nic7018_wdd_ops;
198 wdd->min_timeout = WDT_MIN_TIMEOUT;
199 wdd->max_timeout = WDT_MAX_TIMEOUT;
200 wdd->timeout = WDT_DEFAULT_TIMEOUT;
201 wdd->parent = dev;
202
203 watchdog_set_drvdata(wdd, wdt);
204 watchdog_set_nowayout(wdd, nowayout);
205 watchdog_init_timeout(wdd, timeout, dev);
206
207 /* Unlock WDT register */
208 outb(UNLOCK, wdt->io_base + WDT_REG_LOCK);
209
210 ret = watchdog_register_device(wdd);
211 if (ret) {
212 outb(LOCK, wdt->io_base + WDT_REG_LOCK);
213 return ret;
214 }
215
216 dev_dbg(dev, "io_base=0x%04X, timeout=%d, nowayout=%d\n",
217 wdt->io_base, timeout, nowayout);
218 return 0;
219}
220
221static int nic7018_remove(struct platform_device *pdev)
222{
223 struct nic7018_wdt *wdt = platform_get_drvdata(pdev);
224
225 watchdog_unregister_device(&wdt->wdd);
226
227 /* Lock WDT register */
228 outb(LOCK, wdt->io_base + WDT_REG_LOCK);
229
230 return 0;
231}
232
233static const struct acpi_device_id nic7018_device_ids[] = {
234 {"NIC7018", 0},
235 {"", 0},
236};
237MODULE_DEVICE_TABLE(acpi, nic7018_device_ids);
238
239static struct platform_driver watchdog_driver = {
240 .probe = nic7018_probe,
241 .remove = nic7018_remove,
242 .driver = {
243 .name = KBUILD_MODNAME,
244 .acpi_match_table = ACPI_PTR(nic7018_device_ids),
245 },
246};
247
248module_platform_driver(watchdog_driver);
249
250MODULE_DESCRIPTION("National Instruments NIC7018 Watchdog driver");
251MODULE_AUTHOR("Hui Chun Ong <hui.chun.ong@ni.com>");
252MODULE_LICENSE("GPL");
1/*
2 * Copyright (C) 2016 National Instruments Corp.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include <linux/acpi.h>
16#include <linux/bitops.h>
17#include <linux/device.h>
18#include <linux/io.h>
19#include <linux/module.h>
20#include <linux/platform_device.h>
21#include <linux/watchdog.h>
22
23#define LOCK 0xA5
24#define UNLOCK 0x5A
25
26#define WDT_CTRL_RESET_EN BIT(7)
27#define WDT_RELOAD_PORT_EN BIT(7)
28
29#define WDT_CTRL 1
30#define WDT_RELOAD_CTRL 2
31#define WDT_PRESET_PRESCALE 4
32#define WDT_REG_LOCK 5
33#define WDT_COUNT 6
34#define WDT_RELOAD_PORT 7
35
36#define WDT_MIN_TIMEOUT 1
37#define WDT_MAX_TIMEOUT 464
38#define WDT_DEFAULT_TIMEOUT 80
39
40#define WDT_MAX_COUNTER 15
41
42static unsigned int timeout;
43module_param(timeout, uint, 0);
44MODULE_PARM_DESC(timeout,
45 "Watchdog timeout in seconds. (default="
46 __MODULE_STRING(WDT_DEFAULT_TIMEOUT) ")");
47
48static bool nowayout = WATCHDOG_NOWAYOUT;
49module_param(nowayout, bool, 0);
50MODULE_PARM_DESC(nowayout,
51 "Watchdog cannot be stopped once started. (default="
52 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
53
54struct nic7018_wdt {
55 u16 io_base;
56 u32 period;
57 struct watchdog_device wdd;
58};
59
60struct nic7018_config {
61 u32 period;
62 u8 divider;
63};
64
65static const struct nic7018_config nic7018_configs[] = {
66 { 2, 4 },
67 { 32, 5 },
68};
69
70static inline u32 nic7018_timeout(u32 period, u8 counter)
71{
72 return period * counter - period / 2;
73}
74
75static const struct nic7018_config *nic7018_get_config(u32 timeout,
76 u8 *counter)
77{
78 const struct nic7018_config *config;
79 u8 count;
80
81 if (timeout < 30 && timeout != 16) {
82 config = &nic7018_configs[0];
83 count = timeout / 2 + 1;
84 } else {
85 config = &nic7018_configs[1];
86 count = DIV_ROUND_UP(timeout + 16, 32);
87
88 if (count > WDT_MAX_COUNTER)
89 count = WDT_MAX_COUNTER;
90 }
91 *counter = count;
92 return config;
93}
94
95static int nic7018_set_timeout(struct watchdog_device *wdd,
96 unsigned int timeout)
97{
98 struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
99 const struct nic7018_config *config;
100 u8 counter;
101
102 config = nic7018_get_config(timeout, &counter);
103
104 outb(counter << 4 | config->divider,
105 wdt->io_base + WDT_PRESET_PRESCALE);
106
107 wdd->timeout = nic7018_timeout(config->period, counter);
108 wdt->period = config->period;
109
110 return 0;
111}
112
113static int nic7018_start(struct watchdog_device *wdd)
114{
115 struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
116 u8 control;
117
118 nic7018_set_timeout(wdd, wdd->timeout);
119
120 control = inb(wdt->io_base + WDT_RELOAD_CTRL);
121 outb(control | WDT_RELOAD_PORT_EN, wdt->io_base + WDT_RELOAD_CTRL);
122
123 outb(1, wdt->io_base + WDT_RELOAD_PORT);
124
125 control = inb(wdt->io_base + WDT_CTRL);
126 outb(control | WDT_CTRL_RESET_EN, wdt->io_base + WDT_CTRL);
127
128 return 0;
129}
130
131static int nic7018_stop(struct watchdog_device *wdd)
132{
133 struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
134
135 outb(0, wdt->io_base + WDT_CTRL);
136 outb(0, wdt->io_base + WDT_RELOAD_CTRL);
137 outb(0xF0, wdt->io_base + WDT_PRESET_PRESCALE);
138
139 return 0;
140}
141
142static int nic7018_ping(struct watchdog_device *wdd)
143{
144 struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
145
146 outb(1, wdt->io_base + WDT_RELOAD_PORT);
147
148 return 0;
149}
150
151static unsigned int nic7018_get_timeleft(struct watchdog_device *wdd)
152{
153 struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
154 u8 count;
155
156 count = inb(wdt->io_base + WDT_COUNT) & 0xF;
157 if (!count)
158 return 0;
159
160 return nic7018_timeout(wdt->period, count);
161}
162
163static const struct watchdog_info nic7018_wdd_info = {
164 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
165 .identity = "NIC7018 Watchdog",
166};
167
168static const struct watchdog_ops nic7018_wdd_ops = {
169 .owner = THIS_MODULE,
170 .start = nic7018_start,
171 .stop = nic7018_stop,
172 .ping = nic7018_ping,
173 .set_timeout = nic7018_set_timeout,
174 .get_timeleft = nic7018_get_timeleft,
175};
176
177static int nic7018_probe(struct platform_device *pdev)
178{
179 struct device *dev = &pdev->dev;
180 struct watchdog_device *wdd;
181 struct nic7018_wdt *wdt;
182 struct resource *io_rc;
183 int ret;
184
185 wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
186 if (!wdt)
187 return -ENOMEM;
188
189 platform_set_drvdata(pdev, wdt);
190
191 io_rc = platform_get_resource(pdev, IORESOURCE_IO, 0);
192 if (!io_rc) {
193 dev_err(dev, "missing IO resources\n");
194 return -EINVAL;
195 }
196
197 if (!devm_request_region(dev, io_rc->start, resource_size(io_rc),
198 KBUILD_MODNAME)) {
199 dev_err(dev, "failed to get IO region\n");
200 return -EBUSY;
201 }
202
203 wdt->io_base = io_rc->start;
204 wdd = &wdt->wdd;
205 wdd->info = &nic7018_wdd_info;
206 wdd->ops = &nic7018_wdd_ops;
207 wdd->min_timeout = WDT_MIN_TIMEOUT;
208 wdd->max_timeout = WDT_MAX_TIMEOUT;
209 wdd->timeout = WDT_DEFAULT_TIMEOUT;
210 wdd->parent = dev;
211
212 watchdog_set_drvdata(wdd, wdt);
213 watchdog_set_nowayout(wdd, nowayout);
214
215 ret = watchdog_init_timeout(wdd, timeout, dev);
216 if (ret)
217 dev_warn(dev, "unable to set timeout value, using default\n");
218
219 /* Unlock WDT register */
220 outb(UNLOCK, wdt->io_base + WDT_REG_LOCK);
221
222 ret = watchdog_register_device(wdd);
223 if (ret) {
224 outb(LOCK, wdt->io_base + WDT_REG_LOCK);
225 dev_err(dev, "failed to register watchdog\n");
226 return ret;
227 }
228
229 dev_dbg(dev, "io_base=0x%04X, timeout=%d, nowayout=%d\n",
230 wdt->io_base, timeout, nowayout);
231 return 0;
232}
233
234static int nic7018_remove(struct platform_device *pdev)
235{
236 struct nic7018_wdt *wdt = platform_get_drvdata(pdev);
237
238 watchdog_unregister_device(&wdt->wdd);
239
240 /* Lock WDT register */
241 outb(LOCK, wdt->io_base + WDT_REG_LOCK);
242
243 return 0;
244}
245
246static const struct acpi_device_id nic7018_device_ids[] = {
247 {"NIC7018", 0},
248 {"", 0},
249};
250MODULE_DEVICE_TABLE(acpi, nic7018_device_ids);
251
252static struct platform_driver watchdog_driver = {
253 .probe = nic7018_probe,
254 .remove = nic7018_remove,
255 .driver = {
256 .name = KBUILD_MODNAME,
257 .acpi_match_table = ACPI_PTR(nic7018_device_ids),
258 },
259};
260
261module_platform_driver(watchdog_driver);
262
263MODULE_DESCRIPTION("National Instruments NIC7018 Watchdog driver");
264MODULE_AUTHOR("Hui Chun Ong <hui.chun.ong@ni.com>");
265MODULE_LICENSE("GPL");