Loading...
1/*
2 * RDC321x watchdog driver
3 *
4 * Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org>
5 *
6 * This driver is highly inspired from the cpu5_wdt driver
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 */
23
24#include <linux/module.h>
25#include <linux/moduleparam.h>
26#include <linux/types.h>
27#include <linux/errno.h>
28#include <linux/miscdevice.h>
29#include <linux/fs.h>
30#include <linux/init.h>
31#include <linux/ioport.h>
32#include <linux/timer.h>
33#include <linux/completion.h>
34#include <linux/jiffies.h>
35#include <linux/platform_device.h>
36#include <linux/watchdog.h>
37#include <linux/io.h>
38#include <linux/uaccess.h>
39#include <linux/mfd/rdc321x.h>
40
41#define RDC_WDT_MASK 0x80000000 /* Mask */
42#define RDC_WDT_EN 0x00800000 /* Enable bit */
43#define RDC_WDT_WTI 0x00200000 /* Generate CPU reset/NMI/WDT on timeout */
44#define RDC_WDT_RST 0x00100000 /* Reset bit */
45#define RDC_WDT_WIF 0x00040000 /* WDT IRQ Flag */
46#define RDC_WDT_IRT 0x00000100 /* IRQ Routing table */
47#define RDC_WDT_CNT 0x00000001 /* WDT count */
48
49#define RDC_CLS_TMR 0x80003844 /* Clear timer */
50
51#define RDC_WDT_INTERVAL (HZ/10+1)
52
53static int ticks = 1000;
54
55/* some device data */
56
57static struct {
58 struct completion stop;
59 int running;
60 struct timer_list timer;
61 int queue;
62 int default_ticks;
63 unsigned long inuse;
64 spinlock_t lock;
65 struct pci_dev *sb_pdev;
66 int base_reg;
67} rdc321x_wdt_device;
68
69/* generic helper functions */
70
71static void rdc321x_wdt_trigger(unsigned long unused)
72{
73 unsigned long flags;
74 u32 val;
75
76 if (rdc321x_wdt_device.running)
77 ticks--;
78
79 /* keep watchdog alive */
80 spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
81 pci_read_config_dword(rdc321x_wdt_device.sb_pdev,
82 rdc321x_wdt_device.base_reg, &val);
83 val |= RDC_WDT_EN;
84 pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
85 rdc321x_wdt_device.base_reg, val);
86 spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
87
88 /* requeue?? */
89 if (rdc321x_wdt_device.queue && ticks)
90 mod_timer(&rdc321x_wdt_device.timer,
91 jiffies + RDC_WDT_INTERVAL);
92 else {
93 /* ticks doesn't matter anyway */
94 complete(&rdc321x_wdt_device.stop);
95 }
96
97}
98
99static void rdc321x_wdt_reset(void)
100{
101 ticks = rdc321x_wdt_device.default_ticks;
102}
103
104static void rdc321x_wdt_start(void)
105{
106 unsigned long flags;
107
108 if (!rdc321x_wdt_device.queue) {
109 rdc321x_wdt_device.queue = 1;
110
111 /* Clear the timer */
112 spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
113 pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
114 rdc321x_wdt_device.base_reg, RDC_CLS_TMR);
115
116 /* Enable watchdog and set the timeout to 81.92 us */
117 pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
118 rdc321x_wdt_device.base_reg,
119 RDC_WDT_EN | RDC_WDT_CNT);
120 spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
121
122 mod_timer(&rdc321x_wdt_device.timer,
123 jiffies + RDC_WDT_INTERVAL);
124 }
125
126 /* if process dies, counter is not decremented */
127 rdc321x_wdt_device.running++;
128}
129
130static int rdc321x_wdt_stop(void)
131{
132 if (rdc321x_wdt_device.running)
133 rdc321x_wdt_device.running = 0;
134
135 ticks = rdc321x_wdt_device.default_ticks;
136
137 return -EIO;
138}
139
140/* filesystem operations */
141static int rdc321x_wdt_open(struct inode *inode, struct file *file)
142{
143 if (test_and_set_bit(0, &rdc321x_wdt_device.inuse))
144 return -EBUSY;
145
146 return nonseekable_open(inode, file);
147}
148
149static int rdc321x_wdt_release(struct inode *inode, struct file *file)
150{
151 clear_bit(0, &rdc321x_wdt_device.inuse);
152 return 0;
153}
154
155static long rdc321x_wdt_ioctl(struct file *file, unsigned int cmd,
156 unsigned long arg)
157{
158 void __user *argp = (void __user *)arg;
159 u32 value;
160 static const struct watchdog_info ident = {
161 .options = WDIOF_CARDRESET,
162 .identity = "RDC321x WDT",
163 };
164 unsigned long flags;
165
166 switch (cmd) {
167 case WDIOC_KEEPALIVE:
168 rdc321x_wdt_reset();
169 break;
170 case WDIOC_GETSTATUS:
171 /* Read the value from the DATA register */
172 spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
173 pci_read_config_dword(rdc321x_wdt_device.sb_pdev,
174 rdc321x_wdt_device.base_reg, &value);
175 spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
176 if (copy_to_user(argp, &value, sizeof(u32)))
177 return -EFAULT;
178 break;
179 case WDIOC_GETSUPPORT:
180 if (copy_to_user(argp, &ident, sizeof(ident)))
181 return -EFAULT;
182 break;
183 case WDIOC_SETOPTIONS:
184 if (copy_from_user(&value, argp, sizeof(int)))
185 return -EFAULT;
186 switch (value) {
187 case WDIOS_ENABLECARD:
188 rdc321x_wdt_start();
189 break;
190 case WDIOS_DISABLECARD:
191 return rdc321x_wdt_stop();
192 default:
193 return -EINVAL;
194 }
195 break;
196 default:
197 return -ENOTTY;
198 }
199 return 0;
200}
201
202static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf,
203 size_t count, loff_t *ppos)
204{
205 if (!count)
206 return -EIO;
207
208 rdc321x_wdt_reset();
209
210 return count;
211}
212
213static const struct file_operations rdc321x_wdt_fops = {
214 .owner = THIS_MODULE,
215 .llseek = no_llseek,
216 .unlocked_ioctl = rdc321x_wdt_ioctl,
217 .open = rdc321x_wdt_open,
218 .write = rdc321x_wdt_write,
219 .release = rdc321x_wdt_release,
220};
221
222static struct miscdevice rdc321x_wdt_misc = {
223 .minor = WATCHDOG_MINOR,
224 .name = "watchdog",
225 .fops = &rdc321x_wdt_fops,
226};
227
228static int __devinit rdc321x_wdt_probe(struct platform_device *pdev)
229{
230 int err;
231 struct resource *r;
232 struct rdc321x_wdt_pdata *pdata;
233
234 pdata = pdev->dev.platform_data;
235 if (!pdata) {
236 dev_err(&pdev->dev, "no platform data supplied\n");
237 return -ENODEV;
238 }
239
240 r = platform_get_resource_byname(pdev, IORESOURCE_IO, "wdt-reg");
241 if (!r) {
242 dev_err(&pdev->dev, "failed to get wdt-reg resource\n");
243 return -ENODEV;
244 }
245
246 rdc321x_wdt_device.sb_pdev = pdata->sb_pdev;
247 rdc321x_wdt_device.base_reg = r->start;
248
249 err = misc_register(&rdc321x_wdt_misc);
250 if (err < 0) {
251 dev_err(&pdev->dev, "misc_register failed\n");
252 return err;
253 }
254
255 spin_lock_init(&rdc321x_wdt_device.lock);
256
257 /* Reset the watchdog */
258 pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
259 rdc321x_wdt_device.base_reg, RDC_WDT_RST);
260
261 init_completion(&rdc321x_wdt_device.stop);
262 rdc321x_wdt_device.queue = 0;
263
264 clear_bit(0, &rdc321x_wdt_device.inuse);
265
266 setup_timer(&rdc321x_wdt_device.timer, rdc321x_wdt_trigger, 0);
267
268 rdc321x_wdt_device.default_ticks = ticks;
269
270 dev_info(&pdev->dev, "watchdog init success\n");
271
272 return 0;
273}
274
275static int __devexit rdc321x_wdt_remove(struct platform_device *pdev)
276{
277 if (rdc321x_wdt_device.queue) {
278 rdc321x_wdt_device.queue = 0;
279 wait_for_completion(&rdc321x_wdt_device.stop);
280 }
281
282 misc_deregister(&rdc321x_wdt_misc);
283
284 return 0;
285}
286
287static struct platform_driver rdc321x_wdt_driver = {
288 .probe = rdc321x_wdt_probe,
289 .remove = __devexit_p(rdc321x_wdt_remove),
290 .driver = {
291 .owner = THIS_MODULE,
292 .name = "rdc321x-wdt",
293 },
294};
295
296static int __init rdc321x_wdt_init(void)
297{
298 return platform_driver_register(&rdc321x_wdt_driver);
299}
300
301static void __exit rdc321x_wdt_exit(void)
302{
303 platform_driver_unregister(&rdc321x_wdt_driver);
304}
305
306module_init(rdc321x_wdt_init);
307module_exit(rdc321x_wdt_exit);
308
309MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
310MODULE_DESCRIPTION("RDC321x watchdog driver");
311MODULE_LICENSE("GPL");
312MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * RDC321x watchdog driver
4 *
5 * Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org>
6 *
7 * This driver is highly inspired from the cpu5_wdt driver
8 */
9
10#include <linux/module.h>
11#include <linux/moduleparam.h>
12#include <linux/types.h>
13#include <linux/errno.h>
14#include <linux/miscdevice.h>
15#include <linux/fs.h>
16#include <linux/ioport.h>
17#include <linux/timer.h>
18#include <linux/completion.h>
19#include <linux/jiffies.h>
20#include <linux/platform_device.h>
21#include <linux/watchdog.h>
22#include <linux/io.h>
23#include <linux/uaccess.h>
24#include <linux/mfd/rdc321x.h>
25
26#define RDC_WDT_MASK 0x80000000 /* Mask */
27#define RDC_WDT_EN 0x00800000 /* Enable bit */
28#define RDC_WDT_WTI 0x00200000 /* Generate CPU reset/NMI/WDT on timeout */
29#define RDC_WDT_RST 0x00100000 /* Reset bit */
30#define RDC_WDT_WIF 0x00040000 /* WDT IRQ Flag */
31#define RDC_WDT_IRT 0x00000100 /* IRQ Routing table */
32#define RDC_WDT_CNT 0x00000001 /* WDT count */
33
34#define RDC_CLS_TMR 0x80003844 /* Clear timer */
35
36#define RDC_WDT_INTERVAL (HZ/10+1)
37
38static int ticks = 1000;
39
40/* some device data */
41
42static struct {
43 struct completion stop;
44 int running;
45 struct timer_list timer;
46 int queue;
47 int default_ticks;
48 unsigned long inuse;
49 spinlock_t lock;
50 struct pci_dev *sb_pdev;
51 int base_reg;
52} rdc321x_wdt_device;
53
54/* generic helper functions */
55
56static void rdc321x_wdt_trigger(struct timer_list *unused)
57{
58 unsigned long flags;
59 u32 val;
60
61 if (rdc321x_wdt_device.running)
62 ticks--;
63
64 /* keep watchdog alive */
65 spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
66 pci_read_config_dword(rdc321x_wdt_device.sb_pdev,
67 rdc321x_wdt_device.base_reg, &val);
68 val |= RDC_WDT_EN;
69 pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
70 rdc321x_wdt_device.base_reg, val);
71 spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
72
73 /* requeue?? */
74 if (rdc321x_wdt_device.queue && ticks)
75 mod_timer(&rdc321x_wdt_device.timer,
76 jiffies + RDC_WDT_INTERVAL);
77 else {
78 /* ticks doesn't matter anyway */
79 complete(&rdc321x_wdt_device.stop);
80 }
81
82}
83
84static void rdc321x_wdt_reset(void)
85{
86 ticks = rdc321x_wdt_device.default_ticks;
87}
88
89static void rdc321x_wdt_start(void)
90{
91 unsigned long flags;
92
93 if (!rdc321x_wdt_device.queue) {
94 rdc321x_wdt_device.queue = 1;
95
96 /* Clear the timer */
97 spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
98 pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
99 rdc321x_wdt_device.base_reg, RDC_CLS_TMR);
100
101 /* Enable watchdog and set the timeout to 81.92 us */
102 pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
103 rdc321x_wdt_device.base_reg,
104 RDC_WDT_EN | RDC_WDT_CNT);
105 spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
106
107 mod_timer(&rdc321x_wdt_device.timer,
108 jiffies + RDC_WDT_INTERVAL);
109 }
110
111 /* if process dies, counter is not decremented */
112 rdc321x_wdt_device.running++;
113}
114
115static int rdc321x_wdt_stop(void)
116{
117 if (rdc321x_wdt_device.running)
118 rdc321x_wdt_device.running = 0;
119
120 ticks = rdc321x_wdt_device.default_ticks;
121
122 return -EIO;
123}
124
125/* filesystem operations */
126static int rdc321x_wdt_open(struct inode *inode, struct file *file)
127{
128 if (test_and_set_bit(0, &rdc321x_wdt_device.inuse))
129 return -EBUSY;
130
131 return stream_open(inode, file);
132}
133
134static int rdc321x_wdt_release(struct inode *inode, struct file *file)
135{
136 clear_bit(0, &rdc321x_wdt_device.inuse);
137 return 0;
138}
139
140static long rdc321x_wdt_ioctl(struct file *file, unsigned int cmd,
141 unsigned long arg)
142{
143 void __user *argp = (void __user *)arg;
144 u32 value;
145 static const struct watchdog_info ident = {
146 .options = WDIOF_CARDRESET,
147 .identity = "RDC321x WDT",
148 };
149 unsigned long flags;
150
151 switch (cmd) {
152 case WDIOC_KEEPALIVE:
153 rdc321x_wdt_reset();
154 break;
155 case WDIOC_GETSTATUS:
156 /* Read the value from the DATA register */
157 spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
158 pci_read_config_dword(rdc321x_wdt_device.sb_pdev,
159 rdc321x_wdt_device.base_reg, &value);
160 spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
161 if (copy_to_user(argp, &value, sizeof(u32)))
162 return -EFAULT;
163 break;
164 case WDIOC_GETSUPPORT:
165 if (copy_to_user(argp, &ident, sizeof(ident)))
166 return -EFAULT;
167 break;
168 case WDIOC_SETOPTIONS:
169 if (copy_from_user(&value, argp, sizeof(int)))
170 return -EFAULT;
171 switch (value) {
172 case WDIOS_ENABLECARD:
173 rdc321x_wdt_start();
174 break;
175 case WDIOS_DISABLECARD:
176 return rdc321x_wdt_stop();
177 default:
178 return -EINVAL;
179 }
180 break;
181 default:
182 return -ENOTTY;
183 }
184 return 0;
185}
186
187static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf,
188 size_t count, loff_t *ppos)
189{
190 if (!count)
191 return -EIO;
192
193 rdc321x_wdt_reset();
194
195 return count;
196}
197
198static const struct file_operations rdc321x_wdt_fops = {
199 .owner = THIS_MODULE,
200 .llseek = no_llseek,
201 .unlocked_ioctl = rdc321x_wdt_ioctl,
202 .compat_ioctl = compat_ptr_ioctl,
203 .open = rdc321x_wdt_open,
204 .write = rdc321x_wdt_write,
205 .release = rdc321x_wdt_release,
206};
207
208static struct miscdevice rdc321x_wdt_misc = {
209 .minor = WATCHDOG_MINOR,
210 .name = "watchdog",
211 .fops = &rdc321x_wdt_fops,
212};
213
214static int rdc321x_wdt_probe(struct platform_device *pdev)
215{
216 int err;
217 struct resource *r;
218 struct rdc321x_wdt_pdata *pdata;
219
220 pdata = dev_get_platdata(&pdev->dev);
221 if (!pdata) {
222 dev_err(&pdev->dev, "no platform data supplied\n");
223 return -ENODEV;
224 }
225
226 r = platform_get_resource_byname(pdev, IORESOURCE_IO, "wdt-reg");
227 if (!r) {
228 dev_err(&pdev->dev, "failed to get wdt-reg resource\n");
229 return -ENODEV;
230 }
231
232 rdc321x_wdt_device.sb_pdev = pdata->sb_pdev;
233 rdc321x_wdt_device.base_reg = r->start;
234
235 err = misc_register(&rdc321x_wdt_misc);
236 if (err < 0) {
237 dev_err(&pdev->dev, "misc_register failed\n");
238 return err;
239 }
240
241 spin_lock_init(&rdc321x_wdt_device.lock);
242
243 /* Reset the watchdog */
244 pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
245 rdc321x_wdt_device.base_reg, RDC_WDT_RST);
246
247 init_completion(&rdc321x_wdt_device.stop);
248 rdc321x_wdt_device.queue = 0;
249
250 clear_bit(0, &rdc321x_wdt_device.inuse);
251
252 timer_setup(&rdc321x_wdt_device.timer, rdc321x_wdt_trigger, 0);
253
254 rdc321x_wdt_device.default_ticks = ticks;
255
256 dev_info(&pdev->dev, "watchdog init success\n");
257
258 return 0;
259}
260
261static int rdc321x_wdt_remove(struct platform_device *pdev)
262{
263 if (rdc321x_wdt_device.queue) {
264 rdc321x_wdt_device.queue = 0;
265 wait_for_completion(&rdc321x_wdt_device.stop);
266 }
267
268 misc_deregister(&rdc321x_wdt_misc);
269
270 return 0;
271}
272
273static struct platform_driver rdc321x_wdt_driver = {
274 .probe = rdc321x_wdt_probe,
275 .remove = rdc321x_wdt_remove,
276 .driver = {
277 .name = "rdc321x-wdt",
278 },
279};
280
281module_platform_driver(rdc321x_wdt_driver);
282
283MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
284MODULE_DESCRIPTION("RDC321x watchdog driver");
285MODULE_LICENSE("GPL");