]>
Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
5f119f29 TB |
2 | /* |
3 | * DS1286 Real Time Clock interface for Linux | |
4 | * | |
5 | * Copyright (C) 1998, 1999, 2000 Ralf Baechle | |
6 | * Copyright (C) 2008 Thomas Bogendoerfer | |
7 | * | |
8 | * Based on code written by Paul Gortmaker. | |
5f119f29 TB |
9 | */ |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/rtc.h> | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/bcd.h> | |
d4a5f6d7 | 15 | #include <linux/rtc/ds1286.h> |
d7a6119f | 16 | #include <linux/io.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
5f119f29 | 18 | |
5f119f29 TB |
19 | struct ds1286_priv { |
20 | struct rtc_device *rtc; | |
21 | u32 __iomem *rtcregs; | |
5f119f29 TB |
22 | spinlock_t lock; |
23 | }; | |
24 | ||
25 | static inline u8 ds1286_rtc_read(struct ds1286_priv *priv, int reg) | |
26 | { | |
27 | return __raw_readl(&priv->rtcregs[reg]) & 0xff; | |
28 | } | |
29 | ||
30 | static inline void ds1286_rtc_write(struct ds1286_priv *priv, u8 data, int reg) | |
31 | { | |
32 | __raw_writel(data, &priv->rtcregs[reg]); | |
33 | } | |
34 | ||
16380c15 JS |
35 | |
36 | static int ds1286_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
37 | { | |
38 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
39 | unsigned long flags; | |
40 | unsigned char val; | |
41 | ||
42 | /* Allow or mask alarm interrupts */ | |
43 | spin_lock_irqsave(&priv->lock, flags); | |
44 | val = ds1286_rtc_read(priv, RTC_CMD); | |
45 | if (enabled) | |
46 | val &= ~RTC_TDM; | |
47 | else | |
48 | val |= RTC_TDM; | |
49 | ds1286_rtc_write(priv, val, RTC_CMD); | |
50 | spin_unlock_irqrestore(&priv->lock, flags); | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
5f119f29 TB |
55 | #ifdef CONFIG_RTC_INTF_DEV |
56 | ||
57 | static int ds1286_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
58 | { | |
59 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
60 | unsigned long flags; | |
61 | unsigned char val; | |
62 | ||
63 | switch (cmd) { | |
5f119f29 TB |
64 | case RTC_WIE_OFF: |
65 | /* Mask watchdog int. enab. bit */ | |
66 | spin_lock_irqsave(&priv->lock, flags); | |
67 | val = ds1286_rtc_read(priv, RTC_CMD); | |
68 | val |= RTC_WAM; | |
69 | ds1286_rtc_write(priv, val, RTC_CMD); | |
70 | spin_unlock_irqrestore(&priv->lock, flags); | |
71 | break; | |
72 | case RTC_WIE_ON: | |
73 | /* Allow watchdog interrupts. */ | |
74 | spin_lock_irqsave(&priv->lock, flags); | |
75 | val = ds1286_rtc_read(priv, RTC_CMD); | |
76 | val &= ~RTC_WAM; | |
77 | ds1286_rtc_write(priv, val, RTC_CMD); | |
78 | spin_unlock_irqrestore(&priv->lock, flags); | |
79 | break; | |
80 | default: | |
81 | return -ENOIOCTLCMD; | |
82 | } | |
83 | return 0; | |
84 | } | |
85 | ||
86 | #else | |
87 | #define ds1286_ioctl NULL | |
88 | #endif | |
89 | ||
90 | #ifdef CONFIG_PROC_FS | |
91 | ||
92 | static int ds1286_proc(struct device *dev, struct seq_file *seq) | |
93 | { | |
94 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
95 | unsigned char month, cmd, amode; | |
96 | const char *s; | |
97 | ||
98 | month = ds1286_rtc_read(priv, RTC_MONTH); | |
99 | seq_printf(seq, | |
100 | "oscillator\t: %s\n" | |
101 | "square_wave\t: %s\n", | |
102 | (month & RTC_EOSC) ? "disabled" : "enabled", | |
103 | (month & RTC_ESQW) ? "disabled" : "enabled"); | |
104 | ||
105 | amode = ((ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x80) >> 5) | | |
106 | ((ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x80) >> 6) | | |
107 | ((ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x80) >> 7); | |
108 | switch (amode) { | |
109 | case 7: | |
110 | s = "each minute"; | |
111 | break; | |
112 | case 3: | |
113 | s = "minutes match"; | |
114 | break; | |
115 | case 1: | |
116 | s = "hours and minutes match"; | |
117 | break; | |
118 | case 0: | |
119 | s = "days, hours and minutes match"; | |
120 | break; | |
121 | default: | |
122 | s = "invalid"; | |
123 | break; | |
124 | } | |
125 | seq_printf(seq, "alarm_mode\t: %s\n", s); | |
126 | ||
127 | cmd = ds1286_rtc_read(priv, RTC_CMD); | |
128 | seq_printf(seq, | |
129 | "alarm_enable\t: %s\n" | |
130 | "wdog_alarm\t: %s\n" | |
131 | "alarm_mask\t: %s\n" | |
132 | "wdog_alarm_mask\t: %s\n" | |
133 | "interrupt_mode\t: %s\n" | |
134 | "INTB_mode\t: %s_active\n" | |
135 | "interrupt_pins\t: %s\n", | |
136 | (cmd & RTC_TDF) ? "yes" : "no", | |
137 | (cmd & RTC_WAF) ? "yes" : "no", | |
138 | (cmd & RTC_TDM) ? "disabled" : "enabled", | |
139 | (cmd & RTC_WAM) ? "disabled" : "enabled", | |
140 | (cmd & RTC_PU_LVL) ? "pulse" : "level", | |
141 | (cmd & RTC_IBH_LO) ? "low" : "high", | |
142 | (cmd & RTC_IPSW) ? "unswapped" : "swapped"); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | #else | |
147 | #define ds1286_proc NULL | |
148 | #endif | |
149 | ||
150 | static int ds1286_read_time(struct device *dev, struct rtc_time *tm) | |
151 | { | |
152 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
153 | unsigned char save_control; | |
154 | unsigned long flags; | |
155 | unsigned long uip_watchdog = jiffies; | |
156 | ||
157 | /* | |
158 | * read RTC once any update in progress is done. The update | |
159 | * can take just over 2ms. We wait 10 to 20ms. There is no need to | |
160 | * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. | |
161 | * If you need to know *exactly* when a second has started, enable | |
162 | * periodic update complete interrupts, (via ioctl) and then | |
163 | * immediately read /dev/rtc which will block until you get the IRQ. | |
164 | * Once the read clears, read the RTC time (again via ioctl). Easy. | |
165 | */ | |
166 | ||
167 | if (ds1286_rtc_read(priv, RTC_CMD) & RTC_TE) | |
168 | while (time_before(jiffies, uip_watchdog + 2*HZ/100)) | |
169 | barrier(); | |
170 | ||
171 | /* | |
172 | * Only the values that we read from the RTC are set. We leave | |
173 | * tm_wday, tm_yday and tm_isdst untouched. Even though the | |
174 | * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated | |
175 | * by the RTC when initially set to a non-zero value. | |
176 | */ | |
177 | spin_lock_irqsave(&priv->lock, flags); | |
178 | save_control = ds1286_rtc_read(priv, RTC_CMD); | |
179 | ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD); | |
180 | ||
181 | tm->tm_sec = ds1286_rtc_read(priv, RTC_SECONDS); | |
182 | tm->tm_min = ds1286_rtc_read(priv, RTC_MINUTES); | |
183 | tm->tm_hour = ds1286_rtc_read(priv, RTC_HOURS) & 0x3f; | |
184 | tm->tm_mday = ds1286_rtc_read(priv, RTC_DATE); | |
185 | tm->tm_mon = ds1286_rtc_read(priv, RTC_MONTH) & 0x1f; | |
186 | tm->tm_year = ds1286_rtc_read(priv, RTC_YEAR); | |
187 | ||
188 | ds1286_rtc_write(priv, save_control, RTC_CMD); | |
189 | spin_unlock_irqrestore(&priv->lock, flags); | |
190 | ||
191 | tm->tm_sec = bcd2bin(tm->tm_sec); | |
192 | tm->tm_min = bcd2bin(tm->tm_min); | |
193 | tm->tm_hour = bcd2bin(tm->tm_hour); | |
194 | tm->tm_mday = bcd2bin(tm->tm_mday); | |
195 | tm->tm_mon = bcd2bin(tm->tm_mon); | |
196 | tm->tm_year = bcd2bin(tm->tm_year); | |
197 | ||
198 | /* | |
199 | * Account for differences between how the RTC uses the values | |
200 | * and how they are defined in a struct rtc_time; | |
201 | */ | |
202 | if (tm->tm_year < 45) | |
203 | tm->tm_year += 30; | |
204 | tm->tm_year += 40; | |
205 | if (tm->tm_year < 70) | |
206 | tm->tm_year += 100; | |
207 | ||
208 | tm->tm_mon--; | |
209 | ||
22652ba7 | 210 | return 0; |
5f119f29 TB |
211 | } |
212 | ||
213 | static int ds1286_set_time(struct device *dev, struct rtc_time *tm) | |
214 | { | |
215 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
216 | unsigned char mon, day, hrs, min, sec; | |
217 | unsigned char save_control; | |
218 | unsigned int yrs; | |
219 | unsigned long flags; | |
220 | ||
221 | yrs = tm->tm_year + 1900; | |
222 | mon = tm->tm_mon + 1; /* tm_mon starts at zero */ | |
223 | day = tm->tm_mday; | |
224 | hrs = tm->tm_hour; | |
225 | min = tm->tm_min; | |
226 | sec = tm->tm_sec; | |
227 | ||
228 | if (yrs < 1970) | |
229 | return -EINVAL; | |
230 | ||
231 | yrs -= 1940; | |
232 | if (yrs > 255) /* They are unsigned */ | |
233 | return -EINVAL; | |
234 | ||
235 | if (yrs >= 100) | |
236 | yrs -= 100; | |
237 | ||
238 | sec = bin2bcd(sec); | |
239 | min = bin2bcd(min); | |
240 | hrs = bin2bcd(hrs); | |
241 | day = bin2bcd(day); | |
242 | mon = bin2bcd(mon); | |
243 | yrs = bin2bcd(yrs); | |
244 | ||
245 | spin_lock_irqsave(&priv->lock, flags); | |
246 | save_control = ds1286_rtc_read(priv, RTC_CMD); | |
247 | ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD); | |
248 | ||
249 | ds1286_rtc_write(priv, yrs, RTC_YEAR); | |
250 | ds1286_rtc_write(priv, mon, RTC_MONTH); | |
251 | ds1286_rtc_write(priv, day, RTC_DATE); | |
252 | ds1286_rtc_write(priv, hrs, RTC_HOURS); | |
253 | ds1286_rtc_write(priv, min, RTC_MINUTES); | |
254 | ds1286_rtc_write(priv, sec, RTC_SECONDS); | |
255 | ds1286_rtc_write(priv, 0, RTC_HUNDREDTH_SECOND); | |
256 | ||
257 | ds1286_rtc_write(priv, save_control, RTC_CMD); | |
258 | spin_unlock_irqrestore(&priv->lock, flags); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static int ds1286_read_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
263 | { | |
264 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
5f119f29 TB |
265 | unsigned long flags; |
266 | ||
267 | /* | |
268 | * Only the values that we read from the RTC are set. That | |
269 | * means only tm_wday, tm_hour, tm_min. | |
270 | */ | |
271 | spin_lock_irqsave(&priv->lock, flags); | |
272 | alm->time.tm_min = ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x7f; | |
273 | alm->time.tm_hour = ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x1f; | |
274 | alm->time.tm_wday = ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x07; | |
cb72f60c | 275 | ds1286_rtc_read(priv, RTC_CMD); |
5f119f29 TB |
276 | spin_unlock_irqrestore(&priv->lock, flags); |
277 | ||
278 | alm->time.tm_min = bcd2bin(alm->time.tm_min); | |
279 | alm->time.tm_hour = bcd2bin(alm->time.tm_hour); | |
280 | alm->time.tm_sec = 0; | |
281 | return 0; | |
282 | } | |
283 | ||
284 | static int ds1286_set_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
285 | { | |
286 | struct ds1286_priv *priv = dev_get_drvdata(dev); | |
287 | unsigned char hrs, min, sec; | |
288 | ||
289 | hrs = alm->time.tm_hour; | |
290 | min = alm->time.tm_min; | |
291 | sec = alm->time.tm_sec; | |
292 | ||
293 | if (hrs >= 24) | |
294 | hrs = 0xff; | |
295 | ||
296 | if (min >= 60) | |
297 | min = 0xff; | |
298 | ||
299 | if (sec != 0) | |
300 | return -EINVAL; | |
301 | ||
302 | min = bin2bcd(min); | |
303 | hrs = bin2bcd(hrs); | |
304 | ||
305 | spin_lock(&priv->lock); | |
306 | ds1286_rtc_write(priv, hrs, RTC_HOURS_ALARM); | |
307 | ds1286_rtc_write(priv, min, RTC_MINUTES_ALARM); | |
308 | spin_unlock(&priv->lock); | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static const struct rtc_class_ops ds1286_ops = { | |
16380c15 JS |
314 | .ioctl = ds1286_ioctl, |
315 | .proc = ds1286_proc, | |
5f119f29 TB |
316 | .read_time = ds1286_read_time, |
317 | .set_time = ds1286_set_time, | |
318 | .read_alarm = ds1286_read_alarm, | |
319 | .set_alarm = ds1286_set_alarm, | |
16380c15 | 320 | .alarm_irq_enable = ds1286_alarm_irq_enable, |
5f119f29 TB |
321 | }; |
322 | ||
5a167f45 | 323 | static int ds1286_probe(struct platform_device *pdev) |
5f119f29 TB |
324 | { |
325 | struct rtc_device *rtc; | |
5f119f29 | 326 | struct ds1286_priv *priv; |
5f119f29 | 327 | |
061d698e | 328 | priv = devm_kzalloc(&pdev->dev, sizeof(struct ds1286_priv), GFP_KERNEL); |
5f119f29 TB |
329 | if (!priv) |
330 | return -ENOMEM; | |
331 | ||
09ef18bc | 332 | priv->rtcregs = devm_platform_ioremap_resource(pdev, 0); |
061d698e JH |
333 | if (IS_ERR(priv->rtcregs)) |
334 | return PTR_ERR(priv->rtcregs); | |
335 | ||
5f119f29 | 336 | spin_lock_init(&priv->lock); |
9a281a67 | 337 | platform_set_drvdata(pdev, priv); |
061d698e JH |
338 | rtc = devm_rtc_device_register(&pdev->dev, "ds1286", &ds1286_ops, |
339 | THIS_MODULE); | |
340 | if (IS_ERR(rtc)) | |
341 | return PTR_ERR(rtc); | |
5f119f29 | 342 | priv->rtc = rtc; |
5f119f29 | 343 | return 0; |
5f119f29 TB |
344 | } |
345 | ||
5f119f29 TB |
346 | static struct platform_driver ds1286_platform_driver = { |
347 | .driver = { | |
348 | .name = "rtc-ds1286", | |
5f119f29 TB |
349 | }, |
350 | .probe = ds1286_probe, | |
5f119f29 TB |
351 | }; |
352 | ||
0c4eae66 | 353 | module_platform_driver(ds1286_platform_driver); |
5f119f29 TB |
354 | |
355 | MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>"); | |
356 | MODULE_DESCRIPTION("DS1286 RTC driver"); | |
357 | MODULE_LICENSE("GPL"); | |
5f119f29 | 358 | MODULE_ALIAS("platform:rtc-ds1286"); |