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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#include <linux/io.h>
21
22#define DRV_VERSION "1.0"
23
24struct ds1286_priv {
25 struct rtc_device *rtc;
26 u32 __iomem *rtcregs;
27 size_t size;
28 unsigned long baseaddr;
29 spinlock_t lock;
30};
31
32static inline u8 ds1286_rtc_read(struct ds1286_priv *priv, int reg)
33{
34 return __raw_readl(&priv->rtcregs[reg]) & 0xff;
35}
36
37static inline void ds1286_rtc_write(struct ds1286_priv *priv, u8 data, int reg)
38{
39 __raw_writel(data, &priv->rtcregs[reg]);
40}
41
42#ifdef CONFIG_RTC_INTF_DEV
43
44static int ds1286_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
45{
46 struct ds1286_priv *priv = dev_get_drvdata(dev);
47 unsigned long flags;
48 unsigned char val;
49
50 switch (cmd) {
51 case RTC_AIE_OFF:
52
53 spin_lock_irqsave(&priv->lock, flags);
54 val = ds1286_rtc_read(priv, RTC_CMD);
55 val |= RTC_TDM;
56 ds1286_rtc_write(priv, val, RTC_CMD);
57 spin_unlock_irqrestore(&priv->lock, flags);
58 break;
59 case RTC_AIE_ON:
60
61 spin_lock_irqsave(&priv->lock, flags);
62 val = ds1286_rtc_read(priv, RTC_CMD);
63 val &= ~RTC_TDM;
64 ds1286_rtc_write(priv, val, RTC_CMD);
65 spin_unlock_irqrestore(&priv->lock, flags);
66 break;
67 case RTC_WIE_OFF:
68
69 spin_lock_irqsave(&priv->lock, flags);
70 val = ds1286_rtc_read(priv, RTC_CMD);
71 val |= RTC_WAM;
72 ds1286_rtc_write(priv, val, RTC_CMD);
73 spin_unlock_irqrestore(&priv->lock, flags);
74 break;
75 case RTC_WIE_ON:
76
77 spin_lock_irqsave(&priv->lock, flags);
78 val = ds1286_rtc_read(priv, RTC_CMD);
79 val &= ~RTC_WAM;
80 ds1286_rtc_write(priv, val, RTC_CMD);
81 spin_unlock_irqrestore(&priv->lock, flags);
82 break;
83 default:
84 return -ENOIOCTLCMD;
85 }
86 return 0;
87}
88
89#else
90#define ds1286_ioctl NULL
91#endif
92
93#ifdef CONFIG_PROC_FS
94
95static int ds1286_proc(struct device *dev, struct seq_file *seq)
96{
97 struct ds1286_priv *priv = dev_get_drvdata(dev);
98 unsigned char month, cmd, amode;
99 const char *s;
100
101 month = ds1286_rtc_read(priv, RTC_MONTH);
102 seq_printf(seq,
103 "oscillator\t: %s\n"
104 "square_wave\t: %s\n",
105 (month & RTC_EOSC) ? "disabled" : "enabled",
106 (month & RTC_ESQW) ? "disabled" : "enabled");
107
108 amode = ((ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x80) >> 5) |
109 ((ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x80) >> 6) |
110 ((ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x80) >> 7);
111 switch (amode) {
112 case 7:
113 s = "each minute";
114 break;
115 case 3:
116 s = "minutes match";
117 break;
118 case 1:
119 s = "hours and minutes match";
120 break;
121 case 0:
122 s = "days, hours and minutes match";
123 break;
124 default:
125 s = "invalid";
126 break;
127 }
128 seq_printf(seq, "alarm_mode\t: %s\n", s);
129
130 cmd = ds1286_rtc_read(priv, RTC_CMD);
131 seq_printf(seq,
132 "alarm_enable\t: %s\n"
133 "wdog_alarm\t: %s\n"
134 "alarm_mask\t: %s\n"
135 "wdog_alarm_mask\t: %s\n"
136 "interrupt_mode\t: %s\n"
137 "INTB_mode\t: %s_active\n"
138 "interrupt_pins\t: %s\n",
139 (cmd & RTC_TDF) ? "yes" : "no",
140 (cmd & RTC_WAF) ? "yes" : "no",
141 (cmd & RTC_TDM) ? "disabled" : "enabled",
142 (cmd & RTC_WAM) ? "disabled" : "enabled",
143 (cmd & RTC_PU_LVL) ? "pulse" : "level",
144 (cmd & RTC_IBH_LO) ? "low" : "high",
145 (cmd & RTC_IPSW) ? "unswapped" : "swapped");
146 return 0;
147}
148
149#else
150#define ds1286_proc NULL
151#endif
152
153static int ds1286_read_time(struct device *dev, struct rtc_time *tm)
154{
155 struct ds1286_priv *priv = dev_get_drvdata(dev);
156 unsigned char save_control;
157 unsigned long flags;
158 unsigned long uip_watchdog = jiffies;
159
160
161
162
163
164
165
166
167
168
169
170 if (ds1286_rtc_read(priv, RTC_CMD) & RTC_TE)
171 while (time_before(jiffies, uip_watchdog + 2*HZ/100))
172 barrier();
173
174
175
176
177
178
179
180 spin_lock_irqsave(&priv->lock, flags);
181 save_control = ds1286_rtc_read(priv, RTC_CMD);
182 ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD);
183
184 tm->tm_sec = ds1286_rtc_read(priv, RTC_SECONDS);
185 tm->tm_min = ds1286_rtc_read(priv, RTC_MINUTES);
186 tm->tm_hour = ds1286_rtc_read(priv, RTC_HOURS) & 0x3f;
187 tm->tm_mday = ds1286_rtc_read(priv, RTC_DATE);
188 tm->tm_mon = ds1286_rtc_read(priv, RTC_MONTH) & 0x1f;
189 tm->tm_year = ds1286_rtc_read(priv, RTC_YEAR);
190
191 ds1286_rtc_write(priv, save_control, RTC_CMD);
192 spin_unlock_irqrestore(&priv->lock, flags);
193
194 tm->tm_sec = bcd2bin(tm->tm_sec);
195 tm->tm_min = bcd2bin(tm->tm_min);
196 tm->tm_hour = bcd2bin(tm->tm_hour);
197 tm->tm_mday = bcd2bin(tm->tm_mday);
198 tm->tm_mon = bcd2bin(tm->tm_mon);
199 tm->tm_year = bcd2bin(tm->tm_year);
200
201
202
203
204
205 if (tm->tm_year < 45)
206 tm->tm_year += 30;
207 tm->tm_year += 40;
208 if (tm->tm_year < 70)
209 tm->tm_year += 100;
210
211 tm->tm_mon--;
212
213 return rtc_valid_tm(tm);
214}
215
216static int ds1286_set_time(struct device *dev, struct rtc_time *tm)
217{
218 struct ds1286_priv *priv = dev_get_drvdata(dev);
219 unsigned char mon, day, hrs, min, sec;
220 unsigned char save_control;
221 unsigned int yrs;
222 unsigned long flags;
223
224 yrs = tm->tm_year + 1900;
225 mon = tm->tm_mon + 1;
226 day = tm->tm_mday;
227 hrs = tm->tm_hour;
228 min = tm->tm_min;
229 sec = tm->tm_sec;
230
231 if (yrs < 1970)
232 return -EINVAL;
233
234 yrs -= 1940;
235 if (yrs > 255)
236 return -EINVAL;
237
238 if (yrs >= 100)
239 yrs -= 100;
240
241 sec = bin2bcd(sec);
242 min = bin2bcd(min);
243 hrs = bin2bcd(hrs);
244 day = bin2bcd(day);
245 mon = bin2bcd(mon);
246 yrs = bin2bcd(yrs);
247
248 spin_lock_irqsave(&priv->lock, flags);
249 save_control = ds1286_rtc_read(priv, RTC_CMD);
250 ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD);
251
252 ds1286_rtc_write(priv, yrs, RTC_YEAR);
253 ds1286_rtc_write(priv, mon, RTC_MONTH);
254 ds1286_rtc_write(priv, day, RTC_DATE);
255 ds1286_rtc_write(priv, hrs, RTC_HOURS);
256 ds1286_rtc_write(priv, min, RTC_MINUTES);
257 ds1286_rtc_write(priv, sec, RTC_SECONDS);
258 ds1286_rtc_write(priv, 0, RTC_HUNDREDTH_SECOND);
259
260 ds1286_rtc_write(priv, save_control, RTC_CMD);
261 spin_unlock_irqrestore(&priv->lock, flags);
262 return 0;
263}
264
265static int ds1286_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
266{
267 struct ds1286_priv *priv = dev_get_drvdata(dev);
268 unsigned char cmd;
269 unsigned long flags;
270
271
272
273
274
275 spin_lock_irqsave(&priv->lock, flags);
276 alm->time.tm_min = ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x7f;
277 alm->time.tm_hour = ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x1f;
278 alm->time.tm_wday = ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x07;
279 cmd = ds1286_rtc_read(priv, RTC_CMD);
280 spin_unlock_irqrestore(&priv->lock, flags);
281
282 alm->time.tm_min = bcd2bin(alm->time.tm_min);
283 alm->time.tm_hour = bcd2bin(alm->time.tm_hour);
284 alm->time.tm_sec = 0;
285 return 0;
286}
287
288static int ds1286_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
289{
290 struct ds1286_priv *priv = dev_get_drvdata(dev);
291 unsigned char hrs, min, sec;
292
293 hrs = alm->time.tm_hour;
294 min = alm->time.tm_min;
295 sec = alm->time.tm_sec;
296
297 if (hrs >= 24)
298 hrs = 0xff;
299
300 if (min >= 60)
301 min = 0xff;
302
303 if (sec != 0)
304 return -EINVAL;
305
306 min = bin2bcd(min);
307 hrs = bin2bcd(hrs);
308
309 spin_lock(&priv->lock);
310 ds1286_rtc_write(priv, hrs, RTC_HOURS_ALARM);
311 ds1286_rtc_write(priv, min, RTC_MINUTES_ALARM);
312 spin_unlock(&priv->lock);
313
314 return 0;
315}
316
317static const struct rtc_class_ops ds1286_ops = {
318 .ioctl = ds1286_ioctl,
319 .proc = ds1286_proc,
320 .read_time = ds1286_read_time,
321 .set_time = ds1286_set_time,
322 .read_alarm = ds1286_read_alarm,
323 .set_alarm = ds1286_set_alarm,
324};
325
326static int __devinit ds1286_probe(struct platform_device *pdev)
327{
328 struct rtc_device *rtc;
329 struct resource *res;
330 struct ds1286_priv *priv;
331 int ret = 0;
332
333 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
334 if (!res)
335 return -ENODEV;
336 priv = kzalloc(sizeof(struct ds1286_priv), GFP_KERNEL);
337 if (!priv)
338 return -ENOMEM;
339
340 priv->size = res->end - res->start + 1;
341 if (!request_mem_region(res->start, priv->size, pdev->name)) {
342 ret = -EBUSY;
343 goto out;
344 }
345 priv->baseaddr = res->start;
346 priv->rtcregs = ioremap(priv->baseaddr, priv->size);
347 if (!priv->rtcregs) {
348 ret = -ENOMEM;
349 goto out;
350 }
351 spin_lock_init(&priv->lock);
352 rtc = rtc_device_register("ds1286", &pdev->dev,
353 &ds1286_ops, THIS_MODULE);
354 if (IS_ERR(rtc)) {
355 ret = PTR_ERR(rtc);
356 goto out;
357 }
358 priv->rtc = rtc;
359 platform_set_drvdata(pdev, priv);
360 return 0;
361
362out:
363 if (priv->rtc)
364 rtc_device_unregister(priv->rtc);
365 if (priv->rtcregs)
366 iounmap(priv->rtcregs);
367 if (priv->baseaddr)
368 release_mem_region(priv->baseaddr, priv->size);
369 kfree(priv);
370 return ret;
371}
372
373static int __devexit ds1286_remove(struct platform_device *pdev)
374{
375 struct ds1286_priv *priv = platform_get_drvdata(pdev);
376
377 rtc_device_unregister(priv->rtc);
378 iounmap(priv->rtcregs);
379 release_mem_region(priv->baseaddr, priv->size);
380 kfree(priv);
381 return 0;
382}
383
384static struct platform_driver ds1286_platform_driver = {
385 .driver = {
386 .name = "rtc-ds1286",
387 .owner = THIS_MODULE,
388 },
389 .probe = ds1286_probe,
390 .remove = __devexit_p(ds1286_remove),
391};
392
393static int __init ds1286_init(void)
394{
395 return platform_driver_register(&ds1286_platform_driver);
396}
397
398static void __exit ds1286_exit(void)
399{
400 platform_driver_unregister(&ds1286_platform_driver);
401}
402
403MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
404MODULE_DESCRIPTION("DS1286 RTC driver");
405MODULE_LICENSE("GPL");
406MODULE_VERSION(DRV_VERSION);
407MODULE_ALIAS("platform:rtc-ds1286");
408
409module_init(ds1286_init);
410module_exit(ds1286_exit);
411