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5f119f29 TB |
1 | /* |
2 | * DS1286 Real Time Clock interface for Linux | |
3 | * | |
4 | * Copyright (C) 1998, 1999, 2000 Ralf Baechle | |
5 | * Copyright (C) 2008 Thomas Bogendoerfer | |
6 | * | |
7 | * Based on code written by Paul Gortmaker. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/rtc.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/bcd.h> | |
19 | #include <linux/ds1286.h> | |
20 | ||
21 | #define DRV_VERSION "1.0" | |
22 | ||
23 | struct ds1286_priv { | |
24 | struct rtc_device *rtc; | |
25 | u32 __iomem *rtcregs; | |
26 | size_t size; | |
27 | unsigned long baseaddr; | |
28 | spinlock_t lock; | |
29 | }; | |
30 | ||
31 | static inline u8 ds1286_rtc_read(struct ds1286_priv *priv, int reg) | |
32 | { | |
33 | return __raw_readl(&priv->rtcregs[reg]) & 0xff; | |
34 | } | |
35 | ||
36 | static inline void ds1286_rtc_write(struct ds1286_priv *priv, u8 data, int reg) | |
37 | { | |
38 | __raw_writel(data, &priv->rtcregs[reg]); | |
39 | } | |
40 | ||
41 | #ifdef CONFIG_RTC_INTF_DEV | |
42 | ||
43 | static int ds1286_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
44 | { | |
45 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
46 | unsigned long flags; | |
47 | unsigned char val; | |
48 | ||
49 | switch (cmd) { | |
50 | case RTC_AIE_OFF: | |
51 | /* Mask alarm int. enab. bit */ | |
52 | spin_lock_irqsave(&priv->lock, flags); | |
53 | val = ds1286_rtc_read(priv, RTC_CMD); | |
54 | val |= RTC_TDM; | |
55 | ds1286_rtc_write(priv, val, RTC_CMD); | |
56 | spin_unlock_irqrestore(&priv->lock, flags); | |
57 | break; | |
58 | case RTC_AIE_ON: | |
59 | /* Allow alarm interrupts. */ | |
60 | spin_lock_irqsave(&priv->lock, flags); | |
61 | val = ds1286_rtc_read(priv, RTC_CMD); | |
62 | val &= ~RTC_TDM; | |
63 | ds1286_rtc_write(priv, val, RTC_CMD); | |
64 | spin_unlock_irqrestore(&priv->lock, flags); | |
65 | break; | |
66 | case RTC_WIE_OFF: | |
67 | /* Mask watchdog int. enab. bit */ | |
68 | spin_lock_irqsave(&priv->lock, flags); | |
69 | val = ds1286_rtc_read(priv, RTC_CMD); | |
70 | val |= RTC_WAM; | |
71 | ds1286_rtc_write(priv, val, RTC_CMD); | |
72 | spin_unlock_irqrestore(&priv->lock, flags); | |
73 | break; | |
74 | case RTC_WIE_ON: | |
75 | /* Allow watchdog interrupts. */ | |
76 | spin_lock_irqsave(&priv->lock, flags); | |
77 | val = ds1286_rtc_read(priv, RTC_CMD); | |
78 | val &= ~RTC_WAM; | |
79 | ds1286_rtc_write(priv, val, RTC_CMD); | |
80 | spin_unlock_irqrestore(&priv->lock, flags); | |
81 | break; | |
82 | default: | |
83 | return -ENOIOCTLCMD; | |
84 | } | |
85 | return 0; | |
86 | } | |
87 | ||
88 | #else | |
89 | #define ds1286_ioctl NULL | |
90 | #endif | |
91 | ||
92 | #ifdef CONFIG_PROC_FS | |
93 | ||
94 | static int ds1286_proc(struct device *dev, struct seq_file *seq) | |
95 | { | |
96 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
97 | unsigned char month, cmd, amode; | |
98 | const char *s; | |
99 | ||
100 | month = ds1286_rtc_read(priv, RTC_MONTH); | |
101 | seq_printf(seq, | |
102 | "oscillator\t: %s\n" | |
103 | "square_wave\t: %s\n", | |
104 | (month & RTC_EOSC) ? "disabled" : "enabled", | |
105 | (month & RTC_ESQW) ? "disabled" : "enabled"); | |
106 | ||
107 | amode = ((ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x80) >> 5) | | |
108 | ((ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x80) >> 6) | | |
109 | ((ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x80) >> 7); | |
110 | switch (amode) { | |
111 | case 7: | |
112 | s = "each minute"; | |
113 | break; | |
114 | case 3: | |
115 | s = "minutes match"; | |
116 | break; | |
117 | case 1: | |
118 | s = "hours and minutes match"; | |
119 | break; | |
120 | case 0: | |
121 | s = "days, hours and minutes match"; | |
122 | break; | |
123 | default: | |
124 | s = "invalid"; | |
125 | break; | |
126 | } | |
127 | seq_printf(seq, "alarm_mode\t: %s\n", s); | |
128 | ||
129 | cmd = ds1286_rtc_read(priv, RTC_CMD); | |
130 | seq_printf(seq, | |
131 | "alarm_enable\t: %s\n" | |
132 | "wdog_alarm\t: %s\n" | |
133 | "alarm_mask\t: %s\n" | |
134 | "wdog_alarm_mask\t: %s\n" | |
135 | "interrupt_mode\t: %s\n" | |
136 | "INTB_mode\t: %s_active\n" | |
137 | "interrupt_pins\t: %s\n", | |
138 | (cmd & RTC_TDF) ? "yes" : "no", | |
139 | (cmd & RTC_WAF) ? "yes" : "no", | |
140 | (cmd & RTC_TDM) ? "disabled" : "enabled", | |
141 | (cmd & RTC_WAM) ? "disabled" : "enabled", | |
142 | (cmd & RTC_PU_LVL) ? "pulse" : "level", | |
143 | (cmd & RTC_IBH_LO) ? "low" : "high", | |
144 | (cmd & RTC_IPSW) ? "unswapped" : "swapped"); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | #else | |
149 | #define ds1286_proc NULL | |
150 | #endif | |
151 | ||
152 | static int ds1286_read_time(struct device *dev, struct rtc_time *tm) | |
153 | { | |
154 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
155 | unsigned char save_control; | |
156 | unsigned long flags; | |
157 | unsigned long uip_watchdog = jiffies; | |
158 | ||
159 | /* | |
160 | * read RTC once any update in progress is done. The update | |
161 | * can take just over 2ms. We wait 10 to 20ms. There is no need to | |
162 | * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. | |
163 | * If you need to know *exactly* when a second has started, enable | |
164 | * periodic update complete interrupts, (via ioctl) and then | |
165 | * immediately read /dev/rtc which will block until you get the IRQ. | |
166 | * Once the read clears, read the RTC time (again via ioctl). Easy. | |
167 | */ | |
168 | ||
169 | if (ds1286_rtc_read(priv, RTC_CMD) & RTC_TE) | |
170 | while (time_before(jiffies, uip_watchdog + 2*HZ/100)) | |
171 | barrier(); | |
172 | ||
173 | /* | |
174 | * Only the values that we read from the RTC are set. We leave | |
175 | * tm_wday, tm_yday and tm_isdst untouched. Even though the | |
176 | * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated | |
177 | * by the RTC when initially set to a non-zero value. | |
178 | */ | |
179 | spin_lock_irqsave(&priv->lock, flags); | |
180 | save_control = ds1286_rtc_read(priv, RTC_CMD); | |
181 | ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD); | |
182 | ||
183 | tm->tm_sec = ds1286_rtc_read(priv, RTC_SECONDS); | |
184 | tm->tm_min = ds1286_rtc_read(priv, RTC_MINUTES); | |
185 | tm->tm_hour = ds1286_rtc_read(priv, RTC_HOURS) & 0x3f; | |
186 | tm->tm_mday = ds1286_rtc_read(priv, RTC_DATE); | |
187 | tm->tm_mon = ds1286_rtc_read(priv, RTC_MONTH) & 0x1f; | |
188 | tm->tm_year = ds1286_rtc_read(priv, RTC_YEAR); | |
189 | ||
190 | ds1286_rtc_write(priv, save_control, RTC_CMD); | |
191 | spin_unlock_irqrestore(&priv->lock, flags); | |
192 | ||
193 | tm->tm_sec = bcd2bin(tm->tm_sec); | |
194 | tm->tm_min = bcd2bin(tm->tm_min); | |
195 | tm->tm_hour = bcd2bin(tm->tm_hour); | |
196 | tm->tm_mday = bcd2bin(tm->tm_mday); | |
197 | tm->tm_mon = bcd2bin(tm->tm_mon); | |
198 | tm->tm_year = bcd2bin(tm->tm_year); | |
199 | ||
200 | /* | |
201 | * Account for differences between how the RTC uses the values | |
202 | * and how they are defined in a struct rtc_time; | |
203 | */ | |
204 | if (tm->tm_year < 45) | |
205 | tm->tm_year += 30; | |
206 | tm->tm_year += 40; | |
207 | if (tm->tm_year < 70) | |
208 | tm->tm_year += 100; | |
209 | ||
210 | tm->tm_mon--; | |
211 | ||
212 | return rtc_valid_tm(tm); | |
213 | } | |
214 | ||
215 | static int ds1286_set_time(struct device *dev, struct rtc_time *tm) | |
216 | { | |
217 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
218 | unsigned char mon, day, hrs, min, sec; | |
219 | unsigned char save_control; | |
220 | unsigned int yrs; | |
221 | unsigned long flags; | |
222 | ||
223 | yrs = tm->tm_year + 1900; | |
224 | mon = tm->tm_mon + 1; /* tm_mon starts at zero */ | |
225 | day = tm->tm_mday; | |
226 | hrs = tm->tm_hour; | |
227 | min = tm->tm_min; | |
228 | sec = tm->tm_sec; | |
229 | ||
230 | if (yrs < 1970) | |
231 | return -EINVAL; | |
232 | ||
233 | yrs -= 1940; | |
234 | if (yrs > 255) /* They are unsigned */ | |
235 | return -EINVAL; | |
236 | ||
237 | if (yrs >= 100) | |
238 | yrs -= 100; | |
239 | ||
240 | sec = bin2bcd(sec); | |
241 | min = bin2bcd(min); | |
242 | hrs = bin2bcd(hrs); | |
243 | day = bin2bcd(day); | |
244 | mon = bin2bcd(mon); | |
245 | yrs = bin2bcd(yrs); | |
246 | ||
247 | spin_lock_irqsave(&priv->lock, flags); | |
248 | save_control = ds1286_rtc_read(priv, RTC_CMD); | |
249 | ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD); | |
250 | ||
251 | ds1286_rtc_write(priv, yrs, RTC_YEAR); | |
252 | ds1286_rtc_write(priv, mon, RTC_MONTH); | |
253 | ds1286_rtc_write(priv, day, RTC_DATE); | |
254 | ds1286_rtc_write(priv, hrs, RTC_HOURS); | |
255 | ds1286_rtc_write(priv, min, RTC_MINUTES); | |
256 | ds1286_rtc_write(priv, sec, RTC_SECONDS); | |
257 | ds1286_rtc_write(priv, 0, RTC_HUNDREDTH_SECOND); | |
258 | ||
259 | ds1286_rtc_write(priv, save_control, RTC_CMD); | |
260 | spin_unlock_irqrestore(&priv->lock, flags); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | static int ds1286_read_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
265 | { | |
266 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
267 | unsigned char cmd; | |
268 | unsigned long flags; | |
269 | ||
270 | /* | |
271 | * Only the values that we read from the RTC are set. That | |
272 | * means only tm_wday, tm_hour, tm_min. | |
273 | */ | |
274 | spin_lock_irqsave(&priv->lock, flags); | |
275 | alm->time.tm_min = ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x7f; | |
276 | alm->time.tm_hour = ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x1f; | |
277 | alm->time.tm_wday = ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x07; | |
278 | cmd = ds1286_rtc_read(priv, RTC_CMD); | |
279 | spin_unlock_irqrestore(&priv->lock, flags); | |
280 | ||
281 | alm->time.tm_min = bcd2bin(alm->time.tm_min); | |
282 | alm->time.tm_hour = bcd2bin(alm->time.tm_hour); | |
283 | alm->time.tm_sec = 0; | |
284 | return 0; | |
285 | } | |
286 | ||
287 | static int ds1286_set_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
288 | { | |
289 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
290 | unsigned char hrs, min, sec; | |
291 | ||
292 | hrs = alm->time.tm_hour; | |
293 | min = alm->time.tm_min; | |
294 | sec = alm->time.tm_sec; | |
295 | ||
296 | if (hrs >= 24) | |
297 | hrs = 0xff; | |
298 | ||
299 | if (min >= 60) | |
300 | min = 0xff; | |
301 | ||
302 | if (sec != 0) | |
303 | return -EINVAL; | |
304 | ||
305 | min = bin2bcd(min); | |
306 | hrs = bin2bcd(hrs); | |
307 | ||
308 | spin_lock(&priv->lock); | |
309 | ds1286_rtc_write(priv, hrs, RTC_HOURS_ALARM); | |
310 | ds1286_rtc_write(priv, min, RTC_MINUTES_ALARM); | |
311 | spin_unlock(&priv->lock); | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | static const struct rtc_class_ops ds1286_ops = { | |
317 | .ioctl = ds1286_ioctl, | |
318 | .proc = ds1286_proc, | |
319 | .read_time = ds1286_read_time, | |
320 | .set_time = ds1286_set_time, | |
321 | .read_alarm = ds1286_read_alarm, | |
322 | .set_alarm = ds1286_set_alarm, | |
323 | }; | |
324 | ||
325 | static int __devinit ds1286_probe(struct platform_device *pdev) | |
326 | { | |
327 | struct rtc_device *rtc; | |
328 | struct resource *res; | |
329 | struct ds1286_priv *priv; | |
330 | int ret = 0; | |
331 | ||
332 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
333 | if (!res) | |
334 | return -ENODEV; | |
335 | priv = kzalloc(sizeof(struct ds1286_priv), GFP_KERNEL); | |
336 | if (!priv) | |
337 | return -ENOMEM; | |
338 | ||
339 | priv->size = res->end - res->start + 1; | |
340 | if (!request_mem_region(res->start, priv->size, pdev->name)) { | |
341 | ret = -EBUSY; | |
342 | goto out; | |
343 | } | |
344 | priv->baseaddr = res->start; | |
345 | priv->rtcregs = ioremap(priv->baseaddr, priv->size); | |
346 | if (!priv->rtcregs) { | |
347 | ret = -ENOMEM; | |
348 | goto out; | |
349 | } | |
350 | spin_lock_init(&priv->lock); | |
351 | rtc = rtc_device_register("ds1286", &pdev->dev, | |
352 | &ds1286_ops, THIS_MODULE); | |
353 | if (IS_ERR(rtc)) { | |
354 | ret = PTR_ERR(rtc); | |
355 | goto out; | |
356 | } | |
357 | priv->rtc = rtc; | |
358 | platform_set_drvdata(pdev, priv); | |
359 | return 0; | |
360 | ||
361 | out: | |
362 | if (priv->rtc) | |
363 | rtc_device_unregister(priv->rtc); | |
364 | if (priv->rtcregs) | |
365 | iounmap(priv->rtcregs); | |
366 | if (priv->baseaddr) | |
367 | release_mem_region(priv->baseaddr, priv->size); | |
368 | kfree(priv); | |
369 | return ret; | |
370 | } | |
371 | ||
372 | static int __devexit ds1286_remove(struct platform_device *pdev) | |
373 | { | |
374 | struct ds1286_priv *priv = platform_get_drvdata(pdev); | |
375 | ||
376 | rtc_device_unregister(priv->rtc); | |
377 | iounmap(priv->rtcregs); | |
378 | release_mem_region(priv->baseaddr, priv->size); | |
379 | kfree(priv); | |
380 | return 0; | |
381 | } | |
382 | ||
383 | static struct platform_driver ds1286_platform_driver = { | |
384 | .driver = { | |
385 | .name = "rtc-ds1286", | |
386 | .owner = THIS_MODULE, | |
387 | }, | |
388 | .probe = ds1286_probe, | |
389 | .remove = __devexit_p(ds1286_remove), | |
390 | }; | |
391 | ||
392 | static int __init ds1286_init(void) | |
393 | { | |
394 | return platform_driver_register(&ds1286_platform_driver); | |
395 | } | |
396 | ||
397 | static void __exit ds1286_exit(void) | |
398 | { | |
399 | platform_driver_unregister(&ds1286_platform_driver); | |
400 | } | |
401 | ||
402 | MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>"); | |
403 | MODULE_DESCRIPTION("DS1286 RTC driver"); | |
404 | MODULE_LICENSE("GPL"); | |
405 | MODULE_VERSION(DRV_VERSION); | |
406 | MODULE_ALIAS("platform:rtc-ds1286"); | |
407 | ||
408 | module_init(ds1286_init); | |
409 | module_exit(ds1286_exit); |