Commit | Line | Data |
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50aae724 AG |
1 | /* |
2 | * Real-time clock driver for MPC5121 | |
3 | * | |
4 | * Copyright 2007, Domen Puncer <domen.puncer@telargo.com> | |
5 | * Copyright 2008, Freescale Semiconductor, Inc. All rights reserved. | |
955dbea3 | 6 | * Copyright 2011, Dmitry Eremin-Solenikov |
50aae724 AG |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/rtc.h> | |
c8a6046e | 16 | #include <linux/of.h> |
50aae724 AG |
17 | #include <linux/of_device.h> |
18 | #include <linux/of_platform.h> | |
19 | #include <linux/io.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
50aae724 AG |
21 | |
22 | struct mpc5121_rtc_regs { | |
23 | u8 set_time; /* RTC + 0x00 */ | |
24 | u8 hour_set; /* RTC + 0x01 */ | |
25 | u8 minute_set; /* RTC + 0x02 */ | |
26 | u8 second_set; /* RTC + 0x03 */ | |
27 | ||
28 | u8 set_date; /* RTC + 0x04 */ | |
29 | u8 month_set; /* RTC + 0x05 */ | |
30 | u8 weekday_set; /* RTC + 0x06 */ | |
31 | u8 date_set; /* RTC + 0x07 */ | |
32 | ||
33 | u8 write_sw; /* RTC + 0x08 */ | |
34 | u8 sw_set; /* RTC + 0x09 */ | |
35 | u16 year_set; /* RTC + 0x0a */ | |
36 | ||
37 | u8 alm_enable; /* RTC + 0x0c */ | |
38 | u8 alm_hour_set; /* RTC + 0x0d */ | |
39 | u8 alm_min_set; /* RTC + 0x0e */ | |
40 | u8 int_enable; /* RTC + 0x0f */ | |
41 | ||
42 | u8 reserved1; | |
43 | u8 hour; /* RTC + 0x11 */ | |
44 | u8 minute; /* RTC + 0x12 */ | |
45 | u8 second; /* RTC + 0x13 */ | |
46 | ||
47 | u8 month; /* RTC + 0x14 */ | |
48 | u8 wday_mday; /* RTC + 0x15 */ | |
49 | u16 year; /* RTC + 0x16 */ | |
50 | ||
51 | u8 int_alm; /* RTC + 0x18 */ | |
52 | u8 int_sw; /* RTC + 0x19 */ | |
53 | u8 alm_status; /* RTC + 0x1a */ | |
54 | u8 sw_minute; /* RTC + 0x1b */ | |
55 | ||
56 | u8 bus_error_1; /* RTC + 0x1c */ | |
57 | u8 int_day; /* RTC + 0x1d */ | |
58 | u8 int_min; /* RTC + 0x1e */ | |
59 | u8 int_sec; /* RTC + 0x1f */ | |
60 | ||
61 | /* | |
62 | * target_time: | |
63 | * intended to be used for hibernation but hibernation | |
64 | * does not work on silicon rev 1.5 so use it for non-volatile | |
65 | * storage of offset between the actual_time register and linux | |
66 | * time | |
67 | */ | |
68 | u32 target_time; /* RTC + 0x20 */ | |
69 | /* | |
70 | * actual_time: | |
07d27f2d | 71 | * readonly time since VBAT_RTC was last connected |
50aae724 AG |
72 | */ |
73 | u32 actual_time; /* RTC + 0x24 */ | |
74 | u32 keep_alive; /* RTC + 0x28 */ | |
75 | }; | |
76 | ||
77 | struct mpc5121_rtc_data { | |
78 | unsigned irq; | |
79 | unsigned irq_periodic; | |
80 | struct mpc5121_rtc_regs __iomem *regs; | |
81 | struct rtc_device *rtc; | |
82 | struct rtc_wkalrm wkalarm; | |
83 | }; | |
84 | ||
85 | /* | |
86 | * Update second/minute/hour registers. | |
87 | * | |
88 | * This is just so alarm will work. | |
89 | */ | |
90 | static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs, | |
91 | struct rtc_time *tm) | |
92 | { | |
93 | out_8(®s->second_set, tm->tm_sec); | |
94 | out_8(®s->minute_set, tm->tm_min); | |
95 | out_8(®s->hour_set, tm->tm_hour); | |
96 | ||
97 | /* set time sequence */ | |
98 | out_8(®s->set_time, 0x1); | |
99 | out_8(®s->set_time, 0x3); | |
100 | out_8(®s->set_time, 0x1); | |
101 | out_8(®s->set_time, 0x0); | |
102 | } | |
103 | ||
104 | static int mpc5121_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
105 | { | |
106 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
107 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
108 | unsigned long now; | |
109 | ||
110 | /* | |
111 | * linux time is actual_time plus the offset saved in target_time | |
112 | */ | |
113 | now = in_be32(®s->actual_time) + in_be32(®s->target_time); | |
114 | ||
115 | rtc_time_to_tm(now, tm); | |
116 | ||
117 | /* | |
118 | * update second minute hour registers | |
119 | * so alarms will work | |
120 | */ | |
121 | mpc5121_rtc_update_smh(regs, tm); | |
122 | ||
123 | return rtc_valid_tm(tm); | |
124 | } | |
125 | ||
126 | static int mpc5121_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
127 | { | |
128 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
129 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
130 | int ret; | |
131 | unsigned long now; | |
132 | ||
133 | /* | |
134 | * The actual_time register is read only so we write the offset | |
135 | * between it and linux time to the target_time register. | |
136 | */ | |
137 | ret = rtc_tm_to_time(tm, &now); | |
138 | if (ret == 0) | |
139 | out_be32(®s->target_time, now - in_be32(®s->actual_time)); | |
140 | ||
141 | /* | |
142 | * update second minute hour registers | |
143 | * so alarms will work | |
144 | */ | |
145 | mpc5121_rtc_update_smh(regs, tm); | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
955dbea3 DES |
150 | static int mpc5200_rtc_read_time(struct device *dev, struct rtc_time *tm) |
151 | { | |
152 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
153 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
154 | int tmp; | |
155 | ||
156 | tm->tm_sec = in_8(®s->second); | |
157 | tm->tm_min = in_8(®s->minute); | |
158 | ||
159 | /* 12 hour format? */ | |
160 | if (in_8(®s->hour) & 0x20) | |
161 | tm->tm_hour = (in_8(®s->hour) >> 1) + | |
162 | (in_8(®s->hour) & 1 ? 12 : 0); | |
163 | else | |
164 | tm->tm_hour = in_8(®s->hour); | |
165 | ||
166 | tmp = in_8(®s->wday_mday); | |
167 | tm->tm_mday = tmp & 0x1f; | |
168 | tm->tm_mon = in_8(®s->month) - 1; | |
169 | tm->tm_year = in_be16(®s->year) - 1900; | |
170 | tm->tm_wday = (tmp >> 5) % 7; | |
171 | tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); | |
172 | tm->tm_isdst = 0; | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static int mpc5200_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
178 | { | |
179 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
180 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
181 | ||
182 | mpc5121_rtc_update_smh(regs, tm); | |
183 | ||
184 | /* date */ | |
185 | out_8(®s->month_set, tm->tm_mon + 1); | |
186 | out_8(®s->weekday_set, tm->tm_wday ? tm->tm_wday : 7); | |
187 | out_8(®s->date_set, tm->tm_mday); | |
188 | out_be16(®s->year_set, tm->tm_year + 1900); | |
189 | ||
190 | /* set date sequence */ | |
191 | out_8(®s->set_date, 0x1); | |
192 | out_8(®s->set_date, 0x3); | |
193 | out_8(®s->set_date, 0x1); | |
194 | out_8(®s->set_date, 0x0); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
50aae724 AG |
199 | static int mpc5121_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
200 | { | |
201 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
202 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
203 | ||
204 | *alarm = rtc->wkalarm; | |
205 | ||
206 | alarm->pending = in_8(®s->alm_status); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | static int mpc5121_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
212 | { | |
213 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
214 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
215 | ||
216 | /* | |
217 | * the alarm has no seconds so deal with it | |
218 | */ | |
219 | if (alarm->time.tm_sec) { | |
220 | alarm->time.tm_sec = 0; | |
221 | alarm->time.tm_min++; | |
222 | if (alarm->time.tm_min >= 60) { | |
223 | alarm->time.tm_min = 0; | |
224 | alarm->time.tm_hour++; | |
225 | if (alarm->time.tm_hour >= 24) | |
226 | alarm->time.tm_hour = 0; | |
227 | } | |
228 | } | |
229 | ||
230 | alarm->time.tm_mday = -1; | |
231 | alarm->time.tm_mon = -1; | |
232 | alarm->time.tm_year = -1; | |
233 | ||
234 | out_8(®s->alm_min_set, alarm->time.tm_min); | |
235 | out_8(®s->alm_hour_set, alarm->time.tm_hour); | |
236 | ||
237 | out_8(®s->alm_enable, alarm->enabled); | |
238 | ||
239 | rtc->wkalarm = *alarm; | |
240 | return 0; | |
241 | } | |
242 | ||
243 | static irqreturn_t mpc5121_rtc_handler(int irq, void *dev) | |
244 | { | |
245 | struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev); | |
246 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
247 | ||
248 | if (in_8(®s->int_alm)) { | |
249 | /* acknowledge and clear status */ | |
250 | out_8(®s->int_alm, 1); | |
251 | out_8(®s->alm_status, 1); | |
252 | ||
253 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); | |
254 | return IRQ_HANDLED; | |
255 | } | |
256 | ||
257 | return IRQ_NONE; | |
258 | } | |
259 | ||
260 | static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev) | |
261 | { | |
262 | struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev); | |
263 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
264 | ||
265 | if (in_8(®s->int_sec) && (in_8(®s->int_enable) & 0x1)) { | |
266 | /* acknowledge */ | |
267 | out_8(®s->int_sec, 1); | |
268 | ||
269 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_UF); | |
270 | return IRQ_HANDLED; | |
271 | } | |
272 | ||
273 | return IRQ_NONE; | |
274 | } | |
275 | ||
276 | static int mpc5121_rtc_alarm_irq_enable(struct device *dev, | |
277 | unsigned int enabled) | |
278 | { | |
279 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
280 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
281 | int val; | |
282 | ||
283 | if (enabled) | |
284 | val = 1; | |
285 | else | |
286 | val = 0; | |
287 | ||
288 | out_8(®s->alm_enable, val); | |
289 | rtc->wkalarm.enabled = val; | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
50aae724 AG |
294 | static const struct rtc_class_ops mpc5121_rtc_ops = { |
295 | .read_time = mpc5121_rtc_read_time, | |
296 | .set_time = mpc5121_rtc_set_time, | |
297 | .read_alarm = mpc5121_rtc_read_alarm, | |
298 | .set_alarm = mpc5121_rtc_set_alarm, | |
299 | .alarm_irq_enable = mpc5121_rtc_alarm_irq_enable, | |
50aae724 AG |
300 | }; |
301 | ||
955dbea3 DES |
302 | static const struct rtc_class_ops mpc5200_rtc_ops = { |
303 | .read_time = mpc5200_rtc_read_time, | |
304 | .set_time = mpc5200_rtc_set_time, | |
305 | .read_alarm = mpc5121_rtc_read_alarm, | |
306 | .set_alarm = mpc5121_rtc_set_alarm, | |
307 | .alarm_irq_enable = mpc5121_rtc_alarm_irq_enable, | |
308 | }; | |
309 | ||
5a167f45 | 310 | static int mpc5121_rtc_probe(struct platform_device *op) |
50aae724 AG |
311 | { |
312 | struct mpc5121_rtc_data *rtc; | |
313 | int err = 0; | |
50aae724 | 314 | |
073bf424 | 315 | rtc = devm_kzalloc(&op->dev, sizeof(*rtc), GFP_KERNEL); |
50aae724 AG |
316 | if (!rtc) |
317 | return -ENOMEM; | |
318 | ||
295bdd9c | 319 | rtc->regs = of_iomap(op->dev.of_node, 0); |
50aae724 AG |
320 | if (!rtc->regs) { |
321 | dev_err(&op->dev, "%s: couldn't map io space\n", __func__); | |
073bf424 | 322 | return -ENOSYS; |
50aae724 AG |
323 | } |
324 | ||
325 | device_init_wakeup(&op->dev, 1); | |
326 | ||
ad87a766 | 327 | platform_set_drvdata(op, rtc); |
50aae724 | 328 | |
295bdd9c | 329 | rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1); |
2f6e5f94 | 330 | err = request_irq(rtc->irq, mpc5121_rtc_handler, 0, |
50aae724 AG |
331 | "mpc5121-rtc", &op->dev); |
332 | if (err) { | |
333 | dev_err(&op->dev, "%s: could not request irq: %i\n", | |
334 | __func__, rtc->irq); | |
335 | goto out_dispose; | |
336 | } | |
337 | ||
295bdd9c | 338 | rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0); |
50aae724 | 339 | err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd, |
2f6e5f94 | 340 | 0, "mpc5121-rtc_upd", &op->dev); |
50aae724 AG |
341 | if (err) { |
342 | dev_err(&op->dev, "%s: could not request irq: %i\n", | |
343 | __func__, rtc->irq_periodic); | |
344 | goto out_dispose2; | |
345 | } | |
346 | ||
955dbea3 DES |
347 | if (of_device_is_compatible(op->dev.of_node, "fsl,mpc5121-rtc")) { |
348 | u32 ka; | |
349 | ka = in_be32(&rtc->regs->keep_alive); | |
350 | if (ka & 0x02) { | |
351 | dev_warn(&op->dev, | |
352 | "mpc5121-rtc: Battery or oscillator failure!\n"); | |
353 | out_be32(&rtc->regs->keep_alive, ka); | |
354 | } | |
355 | ||
073bf424 | 356 | rtc->rtc = devm_rtc_device_register(&op->dev, "mpc5121-rtc", |
955dbea3 DES |
357 | &mpc5121_rtc_ops, THIS_MODULE); |
358 | } else { | |
073bf424 | 359 | rtc->rtc = devm_rtc_device_register(&op->dev, "mpc5200-rtc", |
955dbea3 | 360 | &mpc5200_rtc_ops, THIS_MODULE); |
50aae724 AG |
361 | } |
362 | ||
50aae724 AG |
363 | if (IS_ERR(rtc->rtc)) { |
364 | err = PTR_ERR(rtc->rtc); | |
365 | goto out_free_irq; | |
366 | } | |
e48b5e82 | 367 | rtc->rtc->uie_unsupported = 1; |
50aae724 AG |
368 | |
369 | return 0; | |
370 | ||
371 | out_free_irq: | |
372 | free_irq(rtc->irq_periodic, &op->dev); | |
373 | out_dispose2: | |
374 | irq_dispose_mapping(rtc->irq_periodic); | |
375 | free_irq(rtc->irq, &op->dev); | |
376 | out_dispose: | |
377 | irq_dispose_mapping(rtc->irq); | |
378 | iounmap(rtc->regs); | |
50aae724 AG |
379 | |
380 | return err; | |
381 | } | |
382 | ||
5a167f45 | 383 | static int mpc5121_rtc_remove(struct platform_device *op) |
50aae724 | 384 | { |
ad87a766 | 385 | struct mpc5121_rtc_data *rtc = platform_get_drvdata(op); |
50aae724 AG |
386 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; |
387 | ||
388 | /* disable interrupt, so there are no nasty surprises */ | |
389 | out_8(®s->alm_enable, 0); | |
390 | out_8(®s->int_enable, in_8(®s->int_enable) & ~0x1); | |
391 | ||
50aae724 AG |
392 | iounmap(rtc->regs); |
393 | free_irq(rtc->irq, &op->dev); | |
394 | free_irq(rtc->irq_periodic, &op->dev); | |
395 | irq_dispose_mapping(rtc->irq); | |
396 | irq_dispose_mapping(rtc->irq_periodic); | |
50aae724 AG |
397 | |
398 | return 0; | |
399 | } | |
400 | ||
c8a6046e | 401 | #ifdef CONFIG_OF |
5a167f45 | 402 | static struct of_device_id mpc5121_rtc_match[] = { |
50aae724 | 403 | { .compatible = "fsl,mpc5121-rtc", }, |
955dbea3 | 404 | { .compatible = "fsl,mpc5200-rtc", }, |
50aae724 AG |
405 | {}, |
406 | }; | |
c8a6046e | 407 | #endif |
50aae724 | 408 | |
1c48a5c9 | 409 | static struct platform_driver mpc5121_rtc_driver = { |
295bdd9c GL |
410 | .driver = { |
411 | .name = "mpc5121-rtc", | |
412 | .owner = THIS_MODULE, | |
c8a6046e | 413 | .of_match_table = of_match_ptr(mpc5121_rtc_match), |
295bdd9c | 414 | }, |
50aae724 | 415 | .probe = mpc5121_rtc_probe, |
5a167f45 | 416 | .remove = mpc5121_rtc_remove, |
50aae724 AG |
417 | }; |
418 | ||
0c4eae66 | 419 | module_platform_driver(mpc5121_rtc_driver); |
50aae724 AG |
420 | |
421 | MODULE_LICENSE("GPL"); | |
422 | MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>"); |