This source file includes following definitions.
- esb_unlock_registers
- esb_timer_start
- esb_timer_stop
- esb_timer_keepalive
- esb_timer_set_heartbeat
- esb_getdevice
- esb_initdevice
- esb_probe
- esb_remove
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29 #include <linux/module.h>
30 #include <linux/types.h>
31 #include <linux/kernel.h>
32 #include <linux/fs.h>
33 #include <linux/mm.h>
34 #include <linux/miscdevice.h>
35 #include <linux/watchdog.h>
36 #include <linux/pci.h>
37 #include <linux/ioport.h>
38 #include <linux/uaccess.h>
39 #include <linux/io.h>
40
41
42 #define ESB_MODULE_NAME "i6300ESB timer"
43
44
45 #define ESB_CONFIG_REG 0x60
46 #define ESB_LOCK_REG 0x68
47
48
49 #define ESB_TIMER1_REG(w) ((w)->base + 0x00)
50 #define ESB_TIMER2_REG(w) ((w)->base + 0x04)
51 #define ESB_GINTSR_REG(w) ((w)->base + 0x08)
52 #define ESB_RELOAD_REG(w) ((w)->base + 0x0c)
53
54
55 #define ESB_WDT_FUNC (0x01 << 2)
56 #define ESB_WDT_ENABLE (0x01 << 1)
57 #define ESB_WDT_LOCK (0x01 << 0)
58
59
60 #define ESB_WDT_REBOOT (0x01 << 5)
61 #define ESB_WDT_FREQ (0x01 << 2)
62 #define ESB_WDT_INTTYPE (0x03 << 0)
63
64
65 #define ESB_WDT_TIMEOUT (0x01 << 9)
66 #define ESB_WDT_RELOAD (0x01 << 8)
67
68
69 #define ESB_UNLOCK1 0x80
70 #define ESB_UNLOCK2 0x86
71
72
73
74 #define ESB_HEARTBEAT_MIN 1
75 #define ESB_HEARTBEAT_MAX 2046
76 #define ESB_HEARTBEAT_DEFAULT 30
77 #define ESB_HEARTBEAT_RANGE __MODULE_STRING(ESB_HEARTBEAT_MIN) \
78 "<heartbeat<" __MODULE_STRING(ESB_HEARTBEAT_MAX)
79 static int heartbeat;
80 module_param(heartbeat, int, 0);
81 MODULE_PARM_DESC(heartbeat,
82 "Watchdog heartbeat in seconds. (" ESB_HEARTBEAT_RANGE
83 ", default=" __MODULE_STRING(ESB_HEARTBEAT_DEFAULT) ")");
84
85 static bool nowayout = WATCHDOG_NOWAYOUT;
86 module_param(nowayout, bool, 0);
87 MODULE_PARM_DESC(nowayout,
88 "Watchdog cannot be stopped once started (default="
89 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
90
91
92 struct esb_dev {
93 struct watchdog_device wdd;
94 void __iomem *base;
95 struct pci_dev *pdev;
96 };
97
98 #define to_esb_dev(wptr) container_of(wptr, struct esb_dev, wdd)
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109
110 static inline void esb_unlock_registers(struct esb_dev *edev)
111 {
112 writew(ESB_UNLOCK1, ESB_RELOAD_REG(edev));
113 writew(ESB_UNLOCK2, ESB_RELOAD_REG(edev));
114 }
115
116 static int esb_timer_start(struct watchdog_device *wdd)
117 {
118 struct esb_dev *edev = to_esb_dev(wdd);
119 int _wdd_nowayout = test_bit(WDOG_NO_WAY_OUT, &wdd->status);
120 u8 val;
121
122 esb_unlock_registers(edev);
123 writew(ESB_WDT_RELOAD, ESB_RELOAD_REG(edev));
124
125 val = ESB_WDT_ENABLE | (_wdd_nowayout ? ESB_WDT_LOCK : 0x00);
126 pci_write_config_byte(edev->pdev, ESB_LOCK_REG, val);
127 return 0;
128 }
129
130 static int esb_timer_stop(struct watchdog_device *wdd)
131 {
132 struct esb_dev *edev = to_esb_dev(wdd);
133 u8 val;
134
135
136 esb_unlock_registers(edev);
137 writew(ESB_WDT_RELOAD, ESB_RELOAD_REG(edev));
138
139 pci_write_config_byte(edev->pdev, ESB_LOCK_REG, 0x0);
140 pci_read_config_byte(edev->pdev, ESB_LOCK_REG, &val);
141
142
143 return val & ESB_WDT_ENABLE;
144 }
145
146 static int esb_timer_keepalive(struct watchdog_device *wdd)
147 {
148 struct esb_dev *edev = to_esb_dev(wdd);
149
150 esb_unlock_registers(edev);
151 writew(ESB_WDT_RELOAD, ESB_RELOAD_REG(edev));
152
153 return 0;
154 }
155
156 static int esb_timer_set_heartbeat(struct watchdog_device *wdd,
157 unsigned int time)
158 {
159 struct esb_dev *edev = to_esb_dev(wdd);
160 u32 val;
161
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166 val = time << 9;
167
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169 esb_unlock_registers(edev);
170 writel(val, ESB_TIMER1_REG(edev));
171
172
173 esb_unlock_registers(edev);
174 writel(val, ESB_TIMER2_REG(edev));
175
176
177 esb_unlock_registers(edev);
178 writew(ESB_WDT_RELOAD, ESB_RELOAD_REG(edev));
179
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182
183 wdd->timeout = time;
184 return 0;
185 }
186
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189
190
191 static struct watchdog_info esb_info = {
192 .identity = ESB_MODULE_NAME,
193 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
194 };
195
196 static const struct watchdog_ops esb_ops = {
197 .owner = THIS_MODULE,
198 .start = esb_timer_start,
199 .stop = esb_timer_stop,
200 .set_timeout = esb_timer_set_heartbeat,
201 .ping = esb_timer_keepalive,
202 };
203
204
205
206
207 static const struct pci_device_id esb_pci_tbl[] = {
208 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_9), },
209 { 0, },
210 };
211 MODULE_DEVICE_TABLE(pci, esb_pci_tbl);
212
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215
216
217 static unsigned char esb_getdevice(struct esb_dev *edev)
218 {
219 if (pci_enable_device(edev->pdev)) {
220 dev_err(&edev->pdev->dev, "failed to enable device\n");
221 goto err_devput;
222 }
223
224 if (pci_request_region(edev->pdev, 0, ESB_MODULE_NAME)) {
225 dev_err(&edev->pdev->dev, "failed to request region\n");
226 goto err_disable;
227 }
228
229 edev->base = pci_ioremap_bar(edev->pdev, 0);
230 if (edev->base == NULL) {
231
232 dev_err(&edev->pdev->dev, "failed to get BASEADDR\n");
233 goto err_release;
234 }
235
236
237 dev_set_drvdata(&edev->pdev->dev, edev);
238 return 1;
239
240 err_release:
241 pci_release_region(edev->pdev, 0);
242 err_disable:
243 pci_disable_device(edev->pdev);
244 err_devput:
245 return 0;
246 }
247
248 static void esb_initdevice(struct esb_dev *edev)
249 {
250 u8 val1;
251 u16 val2;
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265 pci_write_config_word(edev->pdev, ESB_CONFIG_REG, 0x0003);
266
267
268 pci_read_config_byte(edev->pdev, ESB_LOCK_REG, &val1);
269 if (val1 & ESB_WDT_LOCK)
270 dev_warn(&edev->pdev->dev, "nowayout already set\n");
271
272
273 pci_write_config_byte(edev->pdev, ESB_LOCK_REG, 0x00);
274
275
276 esb_unlock_registers(edev);
277 val2 = readw(ESB_RELOAD_REG(edev));
278 if (val2 & ESB_WDT_TIMEOUT)
279 edev->wdd.bootstatus = WDIOF_CARDRESET;
280
281
282 esb_unlock_registers(edev);
283 writew((ESB_WDT_TIMEOUT | ESB_WDT_RELOAD), ESB_RELOAD_REG(edev));
284
285
286 esb_timer_set_heartbeat(&edev->wdd, edev->wdd.timeout);
287 }
288
289 static int esb_probe(struct pci_dev *pdev,
290 const struct pci_device_id *ent)
291 {
292 struct esb_dev *edev;
293 int ret;
294
295 edev = devm_kzalloc(&pdev->dev, sizeof(*edev), GFP_KERNEL);
296 if (!edev)
297 return -ENOMEM;
298
299
300 edev->pdev = pdev;
301 if (!esb_getdevice(edev))
302 return -ENODEV;
303
304
305 edev->wdd.info = &esb_info;
306 edev->wdd.ops = &esb_ops;
307 edev->wdd.min_timeout = ESB_HEARTBEAT_MIN;
308 edev->wdd.max_timeout = ESB_HEARTBEAT_MAX;
309 edev->wdd.timeout = ESB_HEARTBEAT_DEFAULT;
310 watchdog_init_timeout(&edev->wdd, heartbeat, NULL);
311 watchdog_set_nowayout(&edev->wdd, nowayout);
312 watchdog_stop_on_reboot(&edev->wdd);
313 watchdog_stop_on_unregister(&edev->wdd);
314 esb_initdevice(edev);
315
316
317 ret = watchdog_register_device(&edev->wdd);
318 if (ret != 0)
319 goto err_unmap;
320 dev_info(&pdev->dev,
321 "initialized. heartbeat=%d sec (nowayout=%d)\n",
322 edev->wdd.timeout, nowayout);
323 return 0;
324
325 err_unmap:
326 iounmap(edev->base);
327 pci_release_region(edev->pdev, 0);
328 pci_disable_device(edev->pdev);
329 return ret;
330 }
331
332 static void esb_remove(struct pci_dev *pdev)
333 {
334 struct esb_dev *edev = dev_get_drvdata(&pdev->dev);
335
336 watchdog_unregister_device(&edev->wdd);
337 iounmap(edev->base);
338 pci_release_region(edev->pdev, 0);
339 pci_disable_device(edev->pdev);
340 }
341
342 static struct pci_driver esb_driver = {
343 .name = ESB_MODULE_NAME,
344 .id_table = esb_pci_tbl,
345 .probe = esb_probe,
346 .remove = esb_remove,
347 };
348
349 module_pci_driver(esb_driver);
350
351 MODULE_AUTHOR("Ross Biro and David Härdeman");
352 MODULE_DESCRIPTION("Watchdog driver for Intel 6300ESB chipsets");
353 MODULE_LICENSE("GPL");