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> |
5af50730 | 17 | #include <linux/of_address.h> |
50aae724 | 18 | #include <linux/of_device.h> |
5af50730 | 19 | #include <linux/of_irq.h> |
50aae724 AG |
20 | #include <linux/of_platform.h> |
21 | #include <linux/io.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
50aae724 AG |
23 | |
24 | struct mpc5121_rtc_regs { | |
25 | u8 set_time; /* RTC + 0x00 */ | |
26 | u8 hour_set; /* RTC + 0x01 */ | |
27 | u8 minute_set; /* RTC + 0x02 */ | |
28 | u8 second_set; /* RTC + 0x03 */ | |
29 | ||
30 | u8 set_date; /* RTC + 0x04 */ | |
31 | u8 month_set; /* RTC + 0x05 */ | |
32 | u8 weekday_set; /* RTC + 0x06 */ | |
33 | u8 date_set; /* RTC + 0x07 */ | |
34 | ||
35 | u8 write_sw; /* RTC + 0x08 */ | |
36 | u8 sw_set; /* RTC + 0x09 */ | |
37 | u16 year_set; /* RTC + 0x0a */ | |
38 | ||
39 | u8 alm_enable; /* RTC + 0x0c */ | |
40 | u8 alm_hour_set; /* RTC + 0x0d */ | |
41 | u8 alm_min_set; /* RTC + 0x0e */ | |
42 | u8 int_enable; /* RTC + 0x0f */ | |
43 | ||
44 | u8 reserved1; | |
45 | u8 hour; /* RTC + 0x11 */ | |
46 | u8 minute; /* RTC + 0x12 */ | |
47 | u8 second; /* RTC + 0x13 */ | |
48 | ||
49 | u8 month; /* RTC + 0x14 */ | |
50 | u8 wday_mday; /* RTC + 0x15 */ | |
51 | u16 year; /* RTC + 0x16 */ | |
52 | ||
53 | u8 int_alm; /* RTC + 0x18 */ | |
54 | u8 int_sw; /* RTC + 0x19 */ | |
55 | u8 alm_status; /* RTC + 0x1a */ | |
56 | u8 sw_minute; /* RTC + 0x1b */ | |
57 | ||
58 | u8 bus_error_1; /* RTC + 0x1c */ | |
59 | u8 int_day; /* RTC + 0x1d */ | |
60 | u8 int_min; /* RTC + 0x1e */ | |
61 | u8 int_sec; /* RTC + 0x1f */ | |
62 | ||
63 | /* | |
64 | * target_time: | |
65 | * intended to be used for hibernation but hibernation | |
66 | * does not work on silicon rev 1.5 so use it for non-volatile | |
67 | * storage of offset between the actual_time register and linux | |
68 | * time | |
69 | */ | |
70 | u32 target_time; /* RTC + 0x20 */ | |
71 | /* | |
72 | * actual_time: | |
07d27f2d | 73 | * readonly time since VBAT_RTC was last connected |
50aae724 AG |
74 | */ |
75 | u32 actual_time; /* RTC + 0x24 */ | |
76 | u32 keep_alive; /* RTC + 0x28 */ | |
77 | }; | |
78 | ||
79 | struct mpc5121_rtc_data { | |
80 | unsigned irq; | |
81 | unsigned irq_periodic; | |
82 | struct mpc5121_rtc_regs __iomem *regs; | |
83 | struct rtc_device *rtc; | |
84 | struct rtc_wkalrm wkalarm; | |
85 | }; | |
86 | ||
87 | /* | |
88 | * Update second/minute/hour registers. | |
89 | * | |
90 | * This is just so alarm will work. | |
91 | */ | |
92 | static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs, | |
93 | struct rtc_time *tm) | |
94 | { | |
95 | out_8(®s->second_set, tm->tm_sec); | |
96 | out_8(®s->minute_set, tm->tm_min); | |
97 | out_8(®s->hour_set, tm->tm_hour); | |
98 | ||
99 | /* set time sequence */ | |
100 | out_8(®s->set_time, 0x1); | |
101 | out_8(®s->set_time, 0x3); | |
102 | out_8(®s->set_time, 0x1); | |
103 | out_8(®s->set_time, 0x0); | |
104 | } | |
105 | ||
106 | static int mpc5121_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
107 | { | |
108 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
109 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
110 | unsigned long now; | |
111 | ||
112 | /* | |
113 | * linux time is actual_time plus the offset saved in target_time | |
114 | */ | |
115 | now = in_be32(®s->actual_time) + in_be32(®s->target_time); | |
116 | ||
117 | rtc_time_to_tm(now, tm); | |
118 | ||
119 | /* | |
120 | * update second minute hour registers | |
121 | * so alarms will work | |
122 | */ | |
123 | mpc5121_rtc_update_smh(regs, tm); | |
124 | ||
125 | return rtc_valid_tm(tm); | |
126 | } | |
127 | ||
128 | static int mpc5121_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
129 | { | |
130 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
131 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
132 | int ret; | |
133 | unsigned long now; | |
134 | ||
135 | /* | |
136 | * The actual_time register is read only so we write the offset | |
137 | * between it and linux time to the target_time register. | |
138 | */ | |
139 | ret = rtc_tm_to_time(tm, &now); | |
140 | if (ret == 0) | |
141 | out_be32(®s->target_time, now - in_be32(®s->actual_time)); | |
142 | ||
143 | /* | |
144 | * update second minute hour registers | |
145 | * so alarms will work | |
146 | */ | |
147 | mpc5121_rtc_update_smh(regs, tm); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
955dbea3 DES |
152 | static int mpc5200_rtc_read_time(struct device *dev, struct rtc_time *tm) |
153 | { | |
154 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
155 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
156 | int tmp; | |
157 | ||
158 | tm->tm_sec = in_8(®s->second); | |
159 | tm->tm_min = in_8(®s->minute); | |
160 | ||
161 | /* 12 hour format? */ | |
162 | if (in_8(®s->hour) & 0x20) | |
163 | tm->tm_hour = (in_8(®s->hour) >> 1) + | |
164 | (in_8(®s->hour) & 1 ? 12 : 0); | |
165 | else | |
166 | tm->tm_hour = in_8(®s->hour); | |
167 | ||
168 | tmp = in_8(®s->wday_mday); | |
169 | tm->tm_mday = tmp & 0x1f; | |
170 | tm->tm_mon = in_8(®s->month) - 1; | |
171 | tm->tm_year = in_be16(®s->year) - 1900; | |
172 | tm->tm_wday = (tmp >> 5) % 7; | |
173 | tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); | |
174 | tm->tm_isdst = 0; | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static int mpc5200_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
180 | { | |
181 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
182 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
183 | ||
184 | mpc5121_rtc_update_smh(regs, tm); | |
185 | ||
186 | /* date */ | |
187 | out_8(®s->month_set, tm->tm_mon + 1); | |
188 | out_8(®s->weekday_set, tm->tm_wday ? tm->tm_wday : 7); | |
189 | out_8(®s->date_set, tm->tm_mday); | |
190 | out_be16(®s->year_set, tm->tm_year + 1900); | |
191 | ||
192 | /* set date sequence */ | |
193 | out_8(®s->set_date, 0x1); | |
194 | out_8(®s->set_date, 0x3); | |
195 | out_8(®s->set_date, 0x1); | |
196 | out_8(®s->set_date, 0x0); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
50aae724 AG |
201 | static int mpc5121_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
202 | { | |
203 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
204 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
205 | ||
206 | *alarm = rtc->wkalarm; | |
207 | ||
208 | alarm->pending = in_8(®s->alm_status); | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | static int mpc5121_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
214 | { | |
215 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
216 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
217 | ||
218 | /* | |
219 | * the alarm has no seconds so deal with it | |
220 | */ | |
221 | if (alarm->time.tm_sec) { | |
222 | alarm->time.tm_sec = 0; | |
223 | alarm->time.tm_min++; | |
224 | if (alarm->time.tm_min >= 60) { | |
225 | alarm->time.tm_min = 0; | |
226 | alarm->time.tm_hour++; | |
227 | if (alarm->time.tm_hour >= 24) | |
228 | alarm->time.tm_hour = 0; | |
229 | } | |
230 | } | |
231 | ||
232 | alarm->time.tm_mday = -1; | |
233 | alarm->time.tm_mon = -1; | |
234 | alarm->time.tm_year = -1; | |
235 | ||
236 | out_8(®s->alm_min_set, alarm->time.tm_min); | |
237 | out_8(®s->alm_hour_set, alarm->time.tm_hour); | |
238 | ||
239 | out_8(®s->alm_enable, alarm->enabled); | |
240 | ||
241 | rtc->wkalarm = *alarm; | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static irqreturn_t mpc5121_rtc_handler(int irq, void *dev) | |
246 | { | |
247 | struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev); | |
248 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
249 | ||
250 | if (in_8(®s->int_alm)) { | |
251 | /* acknowledge and clear status */ | |
252 | out_8(®s->int_alm, 1); | |
253 | out_8(®s->alm_status, 1); | |
254 | ||
255 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); | |
256 | return IRQ_HANDLED; | |
257 | } | |
258 | ||
259 | return IRQ_NONE; | |
260 | } | |
261 | ||
262 | static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev) | |
263 | { | |
264 | struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev); | |
265 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
266 | ||
267 | if (in_8(®s->int_sec) && (in_8(®s->int_enable) & 0x1)) { | |
268 | /* acknowledge */ | |
269 | out_8(®s->int_sec, 1); | |
270 | ||
271 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_UF); | |
272 | return IRQ_HANDLED; | |
273 | } | |
274 | ||
275 | return IRQ_NONE; | |
276 | } | |
277 | ||
278 | static int mpc5121_rtc_alarm_irq_enable(struct device *dev, | |
279 | unsigned int enabled) | |
280 | { | |
281 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
282 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
283 | int val; | |
284 | ||
285 | if (enabled) | |
286 | val = 1; | |
287 | else | |
288 | val = 0; | |
289 | ||
290 | out_8(®s->alm_enable, val); | |
291 | rtc->wkalarm.enabled = val; | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
50aae724 AG |
296 | static const struct rtc_class_ops mpc5121_rtc_ops = { |
297 | .read_time = mpc5121_rtc_read_time, | |
298 | .set_time = mpc5121_rtc_set_time, | |
299 | .read_alarm = mpc5121_rtc_read_alarm, | |
300 | .set_alarm = mpc5121_rtc_set_alarm, | |
301 | .alarm_irq_enable = mpc5121_rtc_alarm_irq_enable, | |
50aae724 AG |
302 | }; |
303 | ||
955dbea3 DES |
304 | static const struct rtc_class_ops mpc5200_rtc_ops = { |
305 | .read_time = mpc5200_rtc_read_time, | |
306 | .set_time = mpc5200_rtc_set_time, | |
307 | .read_alarm = mpc5121_rtc_read_alarm, | |
308 | .set_alarm = mpc5121_rtc_set_alarm, | |
309 | .alarm_irq_enable = mpc5121_rtc_alarm_irq_enable, | |
310 | }; | |
311 | ||
5a167f45 | 312 | static int mpc5121_rtc_probe(struct platform_device *op) |
50aae724 AG |
313 | { |
314 | struct mpc5121_rtc_data *rtc; | |
315 | int err = 0; | |
50aae724 | 316 | |
073bf424 | 317 | rtc = devm_kzalloc(&op->dev, sizeof(*rtc), GFP_KERNEL); |
50aae724 AG |
318 | if (!rtc) |
319 | return -ENOMEM; | |
320 | ||
295bdd9c | 321 | rtc->regs = of_iomap(op->dev.of_node, 0); |
50aae724 AG |
322 | if (!rtc->regs) { |
323 | dev_err(&op->dev, "%s: couldn't map io space\n", __func__); | |
073bf424 | 324 | return -ENOSYS; |
50aae724 AG |
325 | } |
326 | ||
327 | device_init_wakeup(&op->dev, 1); | |
328 | ||
ad87a766 | 329 | platform_set_drvdata(op, rtc); |
50aae724 | 330 | |
295bdd9c | 331 | rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1); |
2f6e5f94 | 332 | err = request_irq(rtc->irq, mpc5121_rtc_handler, 0, |
50aae724 AG |
333 | "mpc5121-rtc", &op->dev); |
334 | if (err) { | |
335 | dev_err(&op->dev, "%s: could not request irq: %i\n", | |
336 | __func__, rtc->irq); | |
337 | goto out_dispose; | |
338 | } | |
339 | ||
295bdd9c | 340 | rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0); |
50aae724 | 341 | err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd, |
2f6e5f94 | 342 | 0, "mpc5121-rtc_upd", &op->dev); |
50aae724 AG |
343 | if (err) { |
344 | dev_err(&op->dev, "%s: could not request irq: %i\n", | |
345 | __func__, rtc->irq_periodic); | |
346 | goto out_dispose2; | |
347 | } | |
348 | ||
955dbea3 DES |
349 | if (of_device_is_compatible(op->dev.of_node, "fsl,mpc5121-rtc")) { |
350 | u32 ka; | |
351 | ka = in_be32(&rtc->regs->keep_alive); | |
352 | if (ka & 0x02) { | |
353 | dev_warn(&op->dev, | |
354 | "mpc5121-rtc: Battery or oscillator failure!\n"); | |
355 | out_be32(&rtc->regs->keep_alive, ka); | |
356 | } | |
357 | ||
073bf424 | 358 | rtc->rtc = devm_rtc_device_register(&op->dev, "mpc5121-rtc", |
955dbea3 DES |
359 | &mpc5121_rtc_ops, THIS_MODULE); |
360 | } else { | |
073bf424 | 361 | rtc->rtc = devm_rtc_device_register(&op->dev, "mpc5200-rtc", |
955dbea3 | 362 | &mpc5200_rtc_ops, THIS_MODULE); |
50aae724 AG |
363 | } |
364 | ||
50aae724 AG |
365 | if (IS_ERR(rtc->rtc)) { |
366 | err = PTR_ERR(rtc->rtc); | |
367 | goto out_free_irq; | |
368 | } | |
e48b5e82 | 369 | rtc->rtc->uie_unsupported = 1; |
50aae724 AG |
370 | |
371 | return 0; | |
372 | ||
373 | out_free_irq: | |
374 | free_irq(rtc->irq_periodic, &op->dev); | |
375 | out_dispose2: | |
376 | irq_dispose_mapping(rtc->irq_periodic); | |
377 | free_irq(rtc->irq, &op->dev); | |
378 | out_dispose: | |
379 | irq_dispose_mapping(rtc->irq); | |
380 | iounmap(rtc->regs); | |
50aae724 AG |
381 | |
382 | return err; | |
383 | } | |
384 | ||
5a167f45 | 385 | static int mpc5121_rtc_remove(struct platform_device *op) |
50aae724 | 386 | { |
ad87a766 | 387 | struct mpc5121_rtc_data *rtc = platform_get_drvdata(op); |
50aae724 AG |
388 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; |
389 | ||
390 | /* disable interrupt, so there are no nasty surprises */ | |
391 | out_8(®s->alm_enable, 0); | |
392 | out_8(®s->int_enable, in_8(®s->int_enable) & ~0x1); | |
393 | ||
50aae724 AG |
394 | iounmap(rtc->regs); |
395 | free_irq(rtc->irq, &op->dev); | |
396 | free_irq(rtc->irq_periodic, &op->dev); | |
397 | irq_dispose_mapping(rtc->irq); | |
398 | irq_dispose_mapping(rtc->irq_periodic); | |
50aae724 AG |
399 | |
400 | return 0; | |
401 | } | |
402 | ||
c8a6046e | 403 | #ifdef CONFIG_OF |
5a167f45 | 404 | static struct of_device_id mpc5121_rtc_match[] = { |
50aae724 | 405 | { .compatible = "fsl,mpc5121-rtc", }, |
955dbea3 | 406 | { .compatible = "fsl,mpc5200-rtc", }, |
50aae724 AG |
407 | {}, |
408 | }; | |
c8a6046e | 409 | #endif |
50aae724 | 410 | |
1c48a5c9 | 411 | static struct platform_driver mpc5121_rtc_driver = { |
295bdd9c GL |
412 | .driver = { |
413 | .name = "mpc5121-rtc", | |
414 | .owner = THIS_MODULE, | |
c8a6046e | 415 | .of_match_table = of_match_ptr(mpc5121_rtc_match), |
295bdd9c | 416 | }, |
50aae724 | 417 | .probe = mpc5121_rtc_probe, |
5a167f45 | 418 | .remove = mpc5121_rtc_remove, |
50aae724 AG |
419 | }; |
420 | ||
0c4eae66 | 421 | module_platform_driver(mpc5121_rtc_driver); |
50aae724 AG |
422 | |
423 | MODULE_LICENSE("GPL"); | |
424 | MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>"); |