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b3e8f2c1 FF |
1 | /* |
2 | * RDC321x watchdog driver | |
3 | * | |
842102f3 | 4 | * Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org> |
b3e8f2c1 FF |
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> | |
842102f3 | 39 | #include <linux/mfd/rdc321x.h> |
b3e8f2c1 FF |
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 | ||
53 | static int ticks = 1000; | |
54 | ||
55 | /* some device data */ | |
56 | ||
57 | static 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; | |
842102f3 FF |
65 | struct pci_dev *sb_pdev; |
66 | int base_reg; | |
b3e8f2c1 FF |
67 | } rdc321x_wdt_device; |
68 | ||
69 | /* generic helper functions */ | |
70 | ||
71 | static void rdc321x_wdt_trigger(unsigned long unused) | |
72 | { | |
73 | unsigned long flags; | |
842102f3 | 74 | u32 val; |
b3e8f2c1 FF |
75 | |
76 | if (rdc321x_wdt_device.running) | |
77 | ticks--; | |
78 | ||
79 | /* keep watchdog alive */ | |
80 | spin_lock_irqsave(&rdc321x_wdt_device.lock, flags); | |
842102f3 FF |
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); | |
b3e8f2c1 FF |
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 | ||
99 | static void rdc321x_wdt_reset(void) | |
100 | { | |
101 | ticks = rdc321x_wdt_device.default_ticks; | |
102 | } | |
103 | ||
104 | static 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); | |
842102f3 FF |
113 | pci_write_config_dword(rdc321x_wdt_device.sb_pdev, |
114 | rdc321x_wdt_device.base_reg, RDC_CLS_TMR); | |
b3e8f2c1 FF |
115 | |
116 | /* Enable watchdog and set the timeout to 81.92 us */ | |
842102f3 FF |
117 | pci_write_config_dword(rdc321x_wdt_device.sb_pdev, |
118 | rdc321x_wdt_device.base_reg, | |
119 | RDC_WDT_EN | RDC_WDT_CNT); | |
b3e8f2c1 FF |
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 | ||
130 | static 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 */ | |
141 | static 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 | ||
149 | static int rdc321x_wdt_release(struct inode *inode, struct file *file) | |
150 | { | |
151 | clear_bit(0, &rdc321x_wdt_device.inuse); | |
152 | return 0; | |
153 | } | |
154 | ||
7275fc8c WVS |
155 | static long rdc321x_wdt_ioctl(struct file *file, unsigned int cmd, |
156 | unsigned long arg) | |
b3e8f2c1 FF |
157 | { |
158 | void __user *argp = (void __user *)arg; | |
842102f3 | 159 | u32 value; |
42747d71 | 160 | static const struct watchdog_info ident = { |
b3e8f2c1 FF |
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); | |
842102f3 FF |
173 | pci_read_config_dword(rdc321x_wdt_device.sb_pdev, |
174 | rdc321x_wdt_device.base_reg, &value); | |
b3e8f2c1 | 175 | spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags); |
842102f3 | 176 | if (copy_to_user(argp, &value, sizeof(u32))) |
b3e8f2c1 FF |
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 | ||
202 | static 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 | ||
213 | static const struct file_operations rdc321x_wdt_fops = { | |
214 | .owner = THIS_MODULE, | |
215 | .llseek = no_llseek, | |
7275fc8c | 216 | .unlocked_ioctl = rdc321x_wdt_ioctl, |
b3e8f2c1 FF |
217 | .open = rdc321x_wdt_open, |
218 | .write = rdc321x_wdt_write, | |
219 | .release = rdc321x_wdt_release, | |
220 | }; | |
221 | ||
222 | static struct miscdevice rdc321x_wdt_misc = { | |
223 | .minor = WATCHDOG_MINOR, | |
224 | .name = "watchdog", | |
225 | .fops = &rdc321x_wdt_fops, | |
226 | }; | |
227 | ||
228 | static int __devinit rdc321x_wdt_probe(struct platform_device *pdev) | |
229 | { | |
230 | int err; | |
842102f3 FF |
231 | struct resource *r; |
232 | struct rdc321x_wdt_pdata *pdata; | |
233 | ||
9abd768a | 234 | pdata = pdev->dev.platform_data; |
842102f3 FF |
235 | if (!pdata) { |
236 | dev_err(&pdev->dev, "no platform data supplied\n"); | |
237 | return -ENODEV; | |
238 | } | |
239 | ||
8deca39e | 240 | r = platform_get_resource_byname(pdev, IORESOURCE_IO, "wdt-reg"); |
842102f3 FF |
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; | |
b3e8f2c1 FF |
248 | |
249 | err = misc_register(&rdc321x_wdt_misc); | |
250 | if (err < 0) { | |
842102f3 | 251 | dev_err(&pdev->dev, "misc_register failed\n"); |
b3e8f2c1 FF |
252 | return err; |
253 | } | |
254 | ||
255 | spin_lock_init(&rdc321x_wdt_device.lock); | |
256 | ||
257 | /* Reset the watchdog */ | |
842102f3 FF |
258 | pci_write_config_dword(rdc321x_wdt_device.sb_pdev, |
259 | rdc321x_wdt_device.base_reg, RDC_WDT_RST); | |
b3e8f2c1 FF |
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 | ||
842102f3 | 270 | dev_info(&pdev->dev, "watchdog init success\n"); |
b3e8f2c1 FF |
271 | |
272 | return 0; | |
273 | } | |
274 | ||
b6bf291f | 275 | static int __devexit rdc321x_wdt_remove(struct platform_device *pdev) |
b3e8f2c1 FF |
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 | ||
287 | static struct platform_driver rdc321x_wdt_driver = { | |
288 | .probe = rdc321x_wdt_probe, | |
b6bf291f | 289 | .remove = __devexit_p(rdc321x_wdt_remove), |
b3e8f2c1 FF |
290 | .driver = { |
291 | .owner = THIS_MODULE, | |
292 | .name = "rdc321x-wdt", | |
293 | }, | |
294 | }; | |
295 | ||
296 | static int __init rdc321x_wdt_init(void) | |
297 | { | |
298 | return platform_driver_register(&rdc321x_wdt_driver); | |
299 | } | |
300 | ||
301 | static void __exit rdc321x_wdt_exit(void) | |
302 | { | |
303 | platform_driver_unregister(&rdc321x_wdt_driver); | |
304 | } | |
305 | ||
306 | module_init(rdc321x_wdt_init); | |
307 | module_exit(rdc321x_wdt_exit); | |
308 | ||
309 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); | |
310 | MODULE_DESCRIPTION("RDC321x watchdog driver"); | |
311 | MODULE_LICENSE("GPL"); | |
312 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |