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path: root/drivers/char/watchdog/mpc5200_wdt.c
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Diffstat (limited to 'drivers/char/watchdog/mpc5200_wdt.c')
-rw-r--r--drivers/char/watchdog/mpc5200_wdt.c286
1 files changed, 0 insertions, 286 deletions
diff --git a/drivers/char/watchdog/mpc5200_wdt.c b/drivers/char/watchdog/mpc5200_wdt.c
deleted file mode 100644
index 9cfb97576623..000000000000
--- a/drivers/char/watchdog/mpc5200_wdt.c
+++ /dev/null
@@ -1,286 +0,0 @@
1#include <linux/init.h>
2#include <linux/module.h>
3#include <linux/miscdevice.h>
4#include <linux/watchdog.h>
5#include <linux/io.h>
6#include <linux/spinlock.h>
7#include <asm/of_platform.h>
8#include <asm/uaccess.h>
9#include <asm/mpc52xx.h>
10
11
12#define GPT_MODE_WDT (1<<15)
13#define GPT_MODE_CE (1<<12)
14#define GPT_MODE_MS_TIMER (0x4)
15
16
17struct mpc5200_wdt {
18 unsigned count; /* timer ticks before watchdog kicks in */
19 long ipb_freq;
20 struct miscdevice miscdev;
21 struct resource mem;
22 struct mpc52xx_gpt __iomem *regs;
23 spinlock_t io_lock;
24};
25
26/* is_active stores wether or not the /dev/watchdog device is opened */
27static unsigned long is_active;
28
29/* misc devices don't provide a way, to get back to 'dev' or 'miscdev' from
30 * file operations, which sucks. But there can be max 1 watchdog anyway, so...
31 */
32static struct mpc5200_wdt *wdt_global;
33
34
35/* helper to calculate timeout in timer counts */
36static void mpc5200_wdt_set_timeout(struct mpc5200_wdt *wdt, int timeout)
37{
38 /* use biggest prescaler of 64k */
39 wdt->count = (wdt->ipb_freq + 0xffff) / 0x10000 * timeout;
40
41 if (wdt->count > 0xffff)
42 wdt->count = 0xffff;
43}
44/* return timeout in seconds (calculated from timer count) */
45static int mpc5200_wdt_get_timeout(struct mpc5200_wdt *wdt)
46{
47 return wdt->count * 0x10000 / wdt->ipb_freq;
48}
49
50
51/* watchdog operations */
52static int mpc5200_wdt_start(struct mpc5200_wdt *wdt)
53{
54 spin_lock(&wdt->io_lock);
55 /* disable */
56 out_be32(&wdt->regs->mode, 0);
57 /* set timeout, with maximum prescaler */
58 out_be32(&wdt->regs->count, 0x0 | wdt->count);
59 /* enable watchdog */
60 out_be32(&wdt->regs->mode, GPT_MODE_CE | GPT_MODE_WDT | GPT_MODE_MS_TIMER);
61 spin_unlock(&wdt->io_lock);
62
63 return 0;
64}
65static int mpc5200_wdt_ping(struct mpc5200_wdt *wdt)
66{
67 spin_lock(&wdt->io_lock);
68 /* writing A5 to OCPW resets the watchdog */
69 out_be32(&wdt->regs->mode, 0xA5000000 | (0xffffff & in_be32(&wdt->regs->mode)));
70 spin_unlock(&wdt->io_lock);
71 return 0;
72}
73static int mpc5200_wdt_stop(struct mpc5200_wdt *wdt)
74{
75 spin_lock(&wdt->io_lock);
76 /* disable */
77 out_be32(&wdt->regs->mode, 0);
78 spin_unlock(&wdt->io_lock);
79 return 0;
80}
81
82
83/* file operations */
84static ssize_t mpc5200_wdt_write(struct file *file, const char __user *data,
85 size_t len, loff_t *ppos)
86{
87 struct mpc5200_wdt *wdt = file->private_data;
88 mpc5200_wdt_ping(wdt);
89 return 0;
90}
91static struct watchdog_info mpc5200_wdt_info = {
92 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
93 .identity = "mpc5200 watchdog on GPT0",
94};
95static int mpc5200_wdt_ioctl(struct inode *inode, struct file *file,
96 unsigned int cmd, unsigned long arg)
97{
98 struct mpc5200_wdt *wdt = file->private_data;
99 int __user *data = (int __user *)arg;
100 int timeout;
101 int ret = 0;
102
103 switch (cmd) {
104 case WDIOC_GETSUPPORT:
105 ret = copy_to_user(data, &mpc5200_wdt_info,
106 sizeof(mpc5200_wdt_info));
107 if (ret)
108 ret = -EFAULT;
109 break;
110
111 case WDIOC_GETSTATUS:
112 case WDIOC_GETBOOTSTATUS:
113 ret = put_user(0, data);
114 break;
115
116 case WDIOC_KEEPALIVE:
117 mpc5200_wdt_ping(wdt);
118 break;
119
120 case WDIOC_SETTIMEOUT:
121 ret = get_user(timeout, data);
122 if (ret)
123 break;
124 mpc5200_wdt_set_timeout(wdt, timeout);
125 mpc5200_wdt_start(wdt);
126 /* fall through and return the timeout */
127
128 case WDIOC_GETTIMEOUT:
129 timeout = mpc5200_wdt_get_timeout(wdt);
130 ret = put_user(timeout, data);
131 break;
132
133 default:
134 ret = -ENOTTY;
135 }
136 return ret;
137}
138static int mpc5200_wdt_open(struct inode *inode, struct file *file)
139{
140 /* /dev/watchdog can only be opened once */
141 if (test_and_set_bit(0, &is_active))
142 return -EBUSY;
143
144 /* Set and activate the watchdog */
145 mpc5200_wdt_set_timeout(wdt_global, 30);
146 mpc5200_wdt_start(wdt_global);
147 file->private_data = wdt_global;
148 return nonseekable_open(inode, file);
149}
150static int mpc5200_wdt_release(struct inode *inode, struct file *file)
151{
152#if WATCHDOG_NOWAYOUT == 0
153 struct mpc5200_wdt *wdt = file->private_data;
154 mpc5200_wdt_stop(wdt);
155 wdt->count = 0; /* == disabled */
156#endif
157 clear_bit(0, &is_active);
158 return 0;
159}
160
161static struct file_operations mpc5200_wdt_fops = {
162 .owner = THIS_MODULE,
163 .write = mpc5200_wdt_write,
164 .ioctl = mpc5200_wdt_ioctl,
165 .open = mpc5200_wdt_open,
166 .release = mpc5200_wdt_release,
167};
168
169/* module operations */
170static int mpc5200_wdt_probe(struct of_device *op, const struct of_device_id *match)
171{
172 struct mpc5200_wdt *wdt;
173 int err;
174 const void *has_wdt;
175 int size;
176
177 has_wdt = of_get_property(op->node, "has-wdt", NULL);
178 if (!has_wdt)
179 return -ENODEV;
180
181 wdt = kzalloc(sizeof(*wdt), GFP_KERNEL);
182 if (!wdt)
183 return -ENOMEM;
184
185 wdt->ipb_freq = mpc52xx_find_ipb_freq(op->node);
186
187 err = of_address_to_resource(op->node, 0, &wdt->mem);
188 if (err)
189 goto out_free;
190 size = wdt->mem.end - wdt->mem.start + 1;
191 if (!request_mem_region(wdt->mem.start, size, "mpc5200_wdt")) {
192 err = -ENODEV;
193 goto out_free;
194 }
195 wdt->regs = ioremap(wdt->mem.start, size);
196 if (!wdt->regs) {
197 err = -ENODEV;
198 goto out_release;
199 }
200
201 dev_set_drvdata(&op->dev, wdt);
202 spin_lock_init(&wdt->io_lock);
203
204 wdt->miscdev = (struct miscdevice) {
205 .minor = WATCHDOG_MINOR,
206 .name = "watchdog",
207 .fops = &mpc5200_wdt_fops,
208 .parent = &op->dev,
209 };
210 wdt_global = wdt;
211 err = misc_register(&wdt->miscdev);
212 if (!err)
213 return 0;
214
215 iounmap(wdt->regs);
216 out_release:
217 release_mem_region(wdt->mem.start, size);
218 out_free:
219 kfree(wdt);
220 return err;
221}
222
223static int mpc5200_wdt_remove(struct of_device *op)
224{
225 struct mpc5200_wdt *wdt = dev_get_drvdata(&op->dev);
226
227 mpc5200_wdt_stop(wdt);
228 misc_deregister(&wdt->miscdev);
229 iounmap(wdt->regs);
230 release_mem_region(wdt->mem.start, wdt->mem.end - wdt->mem.start + 1);
231 kfree(wdt);
232
233 return 0;
234}
235static int mpc5200_wdt_suspend(struct of_device *op, pm_message_t state)
236{
237 struct mpc5200_wdt *wdt = dev_get_drvdata(&op->dev);
238 mpc5200_wdt_stop(wdt);
239 return 0;
240}
241static int mpc5200_wdt_resume(struct of_device *op)
242{
243 struct mpc5200_wdt *wdt = dev_get_drvdata(&op->dev);
244 if (wdt->count)
245 mpc5200_wdt_start(wdt);
246 return 0;
247}
248static int mpc5200_wdt_shutdown(struct of_device *op)
249{
250 struct mpc5200_wdt *wdt = dev_get_drvdata(&op->dev);
251 mpc5200_wdt_stop(wdt);
252 return 0;
253}
254
255static struct of_device_id mpc5200_wdt_match[] = {
256 { .compatible = "mpc5200-gpt", },
257 {},
258};
259static struct of_platform_driver mpc5200_wdt_driver = {
260 .owner = THIS_MODULE,
261 .name = "mpc5200-gpt-wdt",
262 .match_table = mpc5200_wdt_match,
263 .probe = mpc5200_wdt_probe,
264 .remove = mpc5200_wdt_remove,
265 .suspend = mpc5200_wdt_suspend,
266 .resume = mpc5200_wdt_resume,
267 .shutdown = mpc5200_wdt_shutdown,
268};
269
270
271static int __init mpc5200_wdt_init(void)
272{
273 return of_register_platform_driver(&mpc5200_wdt_driver);
274}
275
276static void __exit mpc5200_wdt_exit(void)
277{
278 of_unregister_platform_driver(&mpc5200_wdt_driver);
279}
280
281module_init(mpc5200_wdt_init);
282module_exit(mpc5200_wdt_exit);
283
284MODULE_AUTHOR("Domen Puncer <domen.puncer@telargo.com>");
285MODULE_LICENSE("Dual BSD/GPL");
286MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-13 19:11:50 -0500