RDMA/nes: Fix hang issues for large cluster dynamic connections
[linux-2.6] / drivers / rtc / rtc-pcf50633.c
1 /* NXP PCF50633 RTC Driver
2  *
3  * (C) 2006-2008 by Openmoko, Inc.
4  * Author: Balaji Rao <balajirrao@openmoko.org>
5  * All rights reserved.
6  *
7  * Broken down from monstrous PCF50633 driver mainly by
8  * Harald Welte, Andy Green and Werner Almesberger
9  *
10  *  This program is free software; you can redistribute  it and/or modify it
11  *  under  the terms of  the GNU General  Public License as published by the
12  *  Free Software Foundation;  either version 2 of the  License, or (at your
13  *  option) any later version.
14  *
15  */
16
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/device.h>
21 #include <linux/platform_device.h>
22 #include <linux/rtc.h>
23 #include <linux/bcd.h>
24 #include <linux/err.h>
25
26 #include <linux/mfd/pcf50633/core.h>
27
28 #define PCF50633_REG_RTCSC      0x59 /* Second */
29 #define PCF50633_REG_RTCMN      0x5a /* Minute */
30 #define PCF50633_REG_RTCHR      0x5b /* Hour */
31 #define PCF50633_REG_RTCWD      0x5c /* Weekday */
32 #define PCF50633_REG_RTCDT      0x5d /* Day */
33 #define PCF50633_REG_RTCMT      0x5e /* Month */
34 #define PCF50633_REG_RTCYR      0x5f /* Year */
35 #define PCF50633_REG_RTCSCA     0x60 /* Alarm Second */
36 #define PCF50633_REG_RTCMNA     0x61 /* Alarm Minute */
37 #define PCF50633_REG_RTCHRA     0x62 /* Alarm Hour */
38 #define PCF50633_REG_RTCWDA     0x63 /* Alarm Weekday */
39 #define PCF50633_REG_RTCDTA     0x64 /* Alarm Day */
40 #define PCF50633_REG_RTCMTA     0x65 /* Alarm Month */
41 #define PCF50633_REG_RTCYRA     0x66 /* Alarm Year */
42
43 enum pcf50633_time_indexes {
44         PCF50633_TI_SEC,
45         PCF50633_TI_MIN,
46         PCF50633_TI_HOUR,
47         PCF50633_TI_WKDAY,
48         PCF50633_TI_DAY,
49         PCF50633_TI_MONTH,
50         PCF50633_TI_YEAR,
51         PCF50633_TI_EXTENT /* always last */
52 };
53
54 struct pcf50633_time {
55         u_int8_t time[PCF50633_TI_EXTENT];
56 };
57
58 struct pcf50633_rtc {
59         int alarm_enabled;
60         int second_enabled;
61
62         struct pcf50633 *pcf;
63         struct rtc_device *rtc_dev;
64 };
65
66 static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf)
67 {
68         rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]);
69         rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]);
70         rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]);
71         rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]);
72         rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]);
73         rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]);
74         rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100;
75 }
76
77 static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc)
78 {
79         pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec);
80         pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min);
81         pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour);
82         pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday);
83         pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday);
84         pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon);
85         pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100);
86 }
87
88 static int
89 pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
90 {
91         struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
92         int err;
93
94         if (enabled)
95                 err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
96         else
97                 err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
98
99         if (err < 0)
100                 return err;
101
102         rtc->alarm_enabled = enabled;
103
104         return 0;
105 }
106
107 static int
108 pcf50633_rtc_update_irq_enable(struct device *dev, unsigned int enabled)
109 {
110         struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
111         int err;
112
113         if (enabled)
114                 err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND);
115         else
116                 err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND);
117
118         if (err < 0)
119                 return err;
120
121         rtc->second_enabled = enabled;
122
123         return 0;
124 }
125
126 static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm)
127 {
128         struct pcf50633_rtc *rtc;
129         struct pcf50633_time pcf_tm;
130         int ret;
131
132         rtc = dev_get_drvdata(dev);
133
134         ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC,
135                                             PCF50633_TI_EXTENT,
136                                             &pcf_tm.time[0]);
137         if (ret != PCF50633_TI_EXTENT) {
138                 dev_err(dev, "Failed to read time\n");
139                 return -EIO;
140         }
141
142         dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
143                 pcf_tm.time[PCF50633_TI_DAY],
144                 pcf_tm.time[PCF50633_TI_MONTH],
145                 pcf_tm.time[PCF50633_TI_YEAR],
146                 pcf_tm.time[PCF50633_TI_HOUR],
147                 pcf_tm.time[PCF50633_TI_MIN],
148                 pcf_tm.time[PCF50633_TI_SEC]);
149
150         pcf2rtc_time(tm, &pcf_tm);
151
152         dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
153                 tm->tm_mday, tm->tm_mon, tm->tm_year,
154                 tm->tm_hour, tm->tm_min, tm->tm_sec);
155
156         return rtc_valid_tm(tm);
157 }
158
159 static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm)
160 {
161         struct pcf50633_rtc *rtc;
162         struct pcf50633_time pcf_tm;
163         int second_masked, alarm_masked, ret = 0;
164
165         rtc = dev_get_drvdata(dev);
166
167         dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
168                 tm->tm_mday, tm->tm_mon, tm->tm_year,
169                 tm->tm_hour, tm->tm_min, tm->tm_sec);
170
171         rtc2pcf_time(&pcf_tm, tm);
172
173         dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
174                 pcf_tm.time[PCF50633_TI_DAY],
175                 pcf_tm.time[PCF50633_TI_MONTH],
176                 pcf_tm.time[PCF50633_TI_YEAR],
177                 pcf_tm.time[PCF50633_TI_HOUR],
178                 pcf_tm.time[PCF50633_TI_MIN],
179                 pcf_tm.time[PCF50633_TI_SEC]);
180
181
182         second_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_SECOND);
183         alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
184
185         if (!second_masked)
186                 pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND);
187         if (!alarm_masked)
188                 pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
189
190         /* Returns 0 on success */
191         ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC,
192                                              PCF50633_TI_EXTENT,
193                                              &pcf_tm.time[0]);
194
195         if (!second_masked)
196                 pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND);
197         if (!alarm_masked)
198                 pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
199
200         return ret;
201 }
202
203 static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
204 {
205         struct pcf50633_rtc *rtc;
206         struct pcf50633_time pcf_tm;
207         int ret = 0;
208
209         rtc = dev_get_drvdata(dev);
210
211         alrm->enabled = rtc->alarm_enabled;
212
213         ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA,
214                                 PCF50633_TI_EXTENT, &pcf_tm.time[0]);
215         if (ret != PCF50633_TI_EXTENT) {
216                 dev_err(dev, "Failed to read time\n");
217                 return -EIO;
218         }
219
220         pcf2rtc_time(&alrm->time, &pcf_tm);
221
222         return rtc_valid_tm(&alrm->time);
223 }
224
225 static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
226 {
227         struct pcf50633_rtc *rtc;
228         struct pcf50633_time pcf_tm;
229         int alarm_masked, ret = 0;
230
231         rtc = dev_get_drvdata(dev);
232
233         rtc2pcf_time(&pcf_tm, &alrm->time);
234
235         /* do like mktime does and ignore tm_wday */
236         pcf_tm.time[PCF50633_TI_WKDAY] = 7;
237
238         alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
239
240         /* disable alarm interrupt */
241         if (!alarm_masked)
242                 pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
243
244         /* Returns 0 on success */
245         ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA,
246                                 PCF50633_TI_EXTENT, &pcf_tm.time[0]);
247
248         if (!alarm_masked)
249                 pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
250
251         return ret;
252 }
253
254 static struct rtc_class_ops pcf50633_rtc_ops = {
255         .read_time              = pcf50633_rtc_read_time,
256         .set_time               = pcf50633_rtc_set_time,
257         .read_alarm             = pcf50633_rtc_read_alarm,
258         .set_alarm              = pcf50633_rtc_set_alarm,
259         .alarm_irq_enable       = pcf50633_rtc_alarm_irq_enable,
260         .update_irq_enable      = pcf50633_rtc_update_irq_enable,
261 };
262
263 static void pcf50633_rtc_irq(int irq, void *data)
264 {
265         struct pcf50633_rtc *rtc = data;
266
267         switch (irq) {
268         case PCF50633_IRQ_ALARM:
269                 rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
270                 break;
271         case PCF50633_IRQ_SECOND:
272                 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
273                 break;
274         }
275 }
276
277 static int __devinit pcf50633_rtc_probe(struct platform_device *pdev)
278 {
279         struct pcf50633_subdev_pdata *pdata;
280         struct pcf50633_rtc *rtc;
281
282
283         rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
284         if (!rtc)
285                 return -ENOMEM;
286
287         pdata = pdev->dev.platform_data;
288         rtc->pcf = pdata->pcf;
289         platform_set_drvdata(pdev, rtc);
290         rtc->rtc_dev = rtc_device_register("pcf50633-rtc", &pdev->dev,
291                                 &pcf50633_rtc_ops, THIS_MODULE);
292
293         if (IS_ERR(rtc->rtc_dev)) {
294                 kfree(rtc);
295                 return PTR_ERR(rtc->rtc_dev);
296         }
297
298         pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,
299                                         pcf50633_rtc_irq, rtc);
300         pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_SECOND,
301                                         pcf50633_rtc_irq, rtc);
302
303         return 0;
304 }
305
306 static int __devexit pcf50633_rtc_remove(struct platform_device *pdev)
307 {
308         struct pcf50633_rtc *rtc;
309
310         rtc = platform_get_drvdata(pdev);
311
312         pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);
313         pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_SECOND);
314
315         rtc_device_unregister(rtc->rtc_dev);
316         kfree(rtc);
317
318         return 0;
319 }
320
321 static struct platform_driver pcf50633_rtc_driver = {
322         .driver = {
323                 .name = "pcf50633-rtc",
324         },
325         .probe = pcf50633_rtc_probe,
326         .remove = __devexit_p(pcf50633_rtc_remove),
327 };
328
329 static int __init pcf50633_rtc_init(void)
330 {
331         return platform_driver_register(&pcf50633_rtc_driver);
332 }
333 module_init(pcf50633_rtc_init);
334
335 static void __exit pcf50633_rtc_exit(void)
336 {
337         platform_driver_unregister(&pcf50633_rtc_driver);
338 }
339 module_exit(pcf50633_rtc_exit);
340
341 MODULE_DESCRIPTION("PCF50633 RTC driver");
342 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
343 MODULE_LICENSE("GPL");
344