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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. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/rtc.h> | |
15 | #include <linux/of_device.h> | |
16 | #include <linux/of_platform.h> | |
17 | #include <linux/io.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
50aae724 AG |
19 | |
20 | struct mpc5121_rtc_regs { | |
21 | u8 set_time; /* RTC + 0x00 */ | |
22 | u8 hour_set; /* RTC + 0x01 */ | |
23 | u8 minute_set; /* RTC + 0x02 */ | |
24 | u8 second_set; /* RTC + 0x03 */ | |
25 | ||
26 | u8 set_date; /* RTC + 0x04 */ | |
27 | u8 month_set; /* RTC + 0x05 */ | |
28 | u8 weekday_set; /* RTC + 0x06 */ | |
29 | u8 date_set; /* RTC + 0x07 */ | |
30 | ||
31 | u8 write_sw; /* RTC + 0x08 */ | |
32 | u8 sw_set; /* RTC + 0x09 */ | |
33 | u16 year_set; /* RTC + 0x0a */ | |
34 | ||
35 | u8 alm_enable; /* RTC + 0x0c */ | |
36 | u8 alm_hour_set; /* RTC + 0x0d */ | |
37 | u8 alm_min_set; /* RTC + 0x0e */ | |
38 | u8 int_enable; /* RTC + 0x0f */ | |
39 | ||
40 | u8 reserved1; | |
41 | u8 hour; /* RTC + 0x11 */ | |
42 | u8 minute; /* RTC + 0x12 */ | |
43 | u8 second; /* RTC + 0x13 */ | |
44 | ||
45 | u8 month; /* RTC + 0x14 */ | |
46 | u8 wday_mday; /* RTC + 0x15 */ | |
47 | u16 year; /* RTC + 0x16 */ | |
48 | ||
49 | u8 int_alm; /* RTC + 0x18 */ | |
50 | u8 int_sw; /* RTC + 0x19 */ | |
51 | u8 alm_status; /* RTC + 0x1a */ | |
52 | u8 sw_minute; /* RTC + 0x1b */ | |
53 | ||
54 | u8 bus_error_1; /* RTC + 0x1c */ | |
55 | u8 int_day; /* RTC + 0x1d */ | |
56 | u8 int_min; /* RTC + 0x1e */ | |
57 | u8 int_sec; /* RTC + 0x1f */ | |
58 | ||
59 | /* | |
60 | * target_time: | |
61 | * intended to be used for hibernation but hibernation | |
62 | * does not work on silicon rev 1.5 so use it for non-volatile | |
63 | * storage of offset between the actual_time register and linux | |
64 | * time | |
65 | */ | |
66 | u32 target_time; /* RTC + 0x20 */ | |
67 | /* | |
68 | * actual_time: | |
69 | * readonly time since VBAT_RTC was last connected | |
70 | */ | |
71 | u32 actual_time; /* RTC + 0x24 */ | |
72 | u32 keep_alive; /* RTC + 0x28 */ | |
73 | }; | |
74 | ||
75 | struct mpc5121_rtc_data { | |
76 | unsigned irq; | |
77 | unsigned irq_periodic; | |
78 | struct mpc5121_rtc_regs __iomem *regs; | |
79 | struct rtc_device *rtc; | |
80 | struct rtc_wkalrm wkalarm; | |
81 | }; | |
82 | ||
83 | /* | |
84 | * Update second/minute/hour registers. | |
85 | * | |
86 | * This is just so alarm will work. | |
87 | */ | |
88 | static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs, | |
89 | struct rtc_time *tm) | |
90 | { | |
91 | out_8(®s->second_set, tm->tm_sec); | |
92 | out_8(®s->minute_set, tm->tm_min); | |
93 | out_8(®s->hour_set, tm->tm_hour); | |
94 | ||
95 | /* set time sequence */ | |
96 | out_8(®s->set_time, 0x1); | |
97 | out_8(®s->set_time, 0x3); | |
98 | out_8(®s->set_time, 0x1); | |
99 | out_8(®s->set_time, 0x0); | |
100 | } | |
101 | ||
102 | static int mpc5121_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
103 | { | |
104 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
105 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
106 | unsigned long now; | |
107 | ||
108 | /* | |
109 | * linux time is actual_time plus the offset saved in target_time | |
110 | */ | |
111 | now = in_be32(®s->actual_time) + in_be32(®s->target_time); | |
112 | ||
113 | rtc_time_to_tm(now, tm); | |
114 | ||
115 | /* | |
116 | * update second minute hour registers | |
117 | * so alarms will work | |
118 | */ | |
119 | mpc5121_rtc_update_smh(regs, tm); | |
120 | ||
121 | return rtc_valid_tm(tm); | |
122 | } | |
123 | ||
124 | static int mpc5121_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
125 | { | |
126 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
127 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
128 | int ret; | |
129 | unsigned long now; | |
130 | ||
131 | /* | |
132 | * The actual_time register is read only so we write the offset | |
133 | * between it and linux time to the target_time register. | |
134 | */ | |
135 | ret = rtc_tm_to_time(tm, &now); | |
136 | if (ret == 0) | |
137 | out_be32(®s->target_time, now - in_be32(®s->actual_time)); | |
138 | ||
139 | /* | |
140 | * update second minute hour registers | |
141 | * so alarms will work | |
142 | */ | |
143 | mpc5121_rtc_update_smh(regs, tm); | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | static int mpc5121_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
149 | { | |
150 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
151 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
152 | ||
153 | *alarm = rtc->wkalarm; | |
154 | ||
155 | alarm->pending = in_8(®s->alm_status); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static int mpc5121_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
161 | { | |
162 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
163 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
164 | ||
165 | /* | |
166 | * the alarm has no seconds so deal with it | |
167 | */ | |
168 | if (alarm->time.tm_sec) { | |
169 | alarm->time.tm_sec = 0; | |
170 | alarm->time.tm_min++; | |
171 | if (alarm->time.tm_min >= 60) { | |
172 | alarm->time.tm_min = 0; | |
173 | alarm->time.tm_hour++; | |
174 | if (alarm->time.tm_hour >= 24) | |
175 | alarm->time.tm_hour = 0; | |
176 | } | |
177 | } | |
178 | ||
179 | alarm->time.tm_mday = -1; | |
180 | alarm->time.tm_mon = -1; | |
181 | alarm->time.tm_year = -1; | |
182 | ||
183 | out_8(®s->alm_min_set, alarm->time.tm_min); | |
184 | out_8(®s->alm_hour_set, alarm->time.tm_hour); | |
185 | ||
186 | out_8(®s->alm_enable, alarm->enabled); | |
187 | ||
188 | rtc->wkalarm = *alarm; | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static irqreturn_t mpc5121_rtc_handler(int irq, void *dev) | |
193 | { | |
194 | struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev); | |
195 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
196 | ||
197 | if (in_8(®s->int_alm)) { | |
198 | /* acknowledge and clear status */ | |
199 | out_8(®s->int_alm, 1); | |
200 | out_8(®s->alm_status, 1); | |
201 | ||
202 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); | |
203 | return IRQ_HANDLED; | |
204 | } | |
205 | ||
206 | return IRQ_NONE; | |
207 | } | |
208 | ||
209 | static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev) | |
210 | { | |
211 | struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev); | |
212 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
213 | ||
214 | if (in_8(®s->int_sec) && (in_8(®s->int_enable) & 0x1)) { | |
215 | /* acknowledge */ | |
216 | out_8(®s->int_sec, 1); | |
217 | ||
218 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_UF); | |
219 | return IRQ_HANDLED; | |
220 | } | |
221 | ||
222 | return IRQ_NONE; | |
223 | } | |
224 | ||
225 | static int mpc5121_rtc_alarm_irq_enable(struct device *dev, | |
226 | unsigned int enabled) | |
227 | { | |
228 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); | |
229 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
230 | int val; | |
231 | ||
232 | if (enabled) | |
233 | val = 1; | |
234 | else | |
235 | val = 0; | |
236 | ||
237 | out_8(®s->alm_enable, val); | |
238 | rtc->wkalarm.enabled = val; | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
50aae724 AG |
243 | static const struct rtc_class_ops mpc5121_rtc_ops = { |
244 | .read_time = mpc5121_rtc_read_time, | |
245 | .set_time = mpc5121_rtc_set_time, | |
246 | .read_alarm = mpc5121_rtc_read_alarm, | |
247 | .set_alarm = mpc5121_rtc_set_alarm, | |
248 | .alarm_irq_enable = mpc5121_rtc_alarm_irq_enable, | |
50aae724 AG |
249 | }; |
250 | ||
1c48a5c9 | 251 | static int __devinit mpc5121_rtc_probe(struct platform_device *op) |
50aae724 AG |
252 | { |
253 | struct mpc5121_rtc_data *rtc; | |
254 | int err = 0; | |
255 | u32 ka; | |
256 | ||
257 | rtc = kzalloc(sizeof(*rtc), GFP_KERNEL); | |
258 | if (!rtc) | |
259 | return -ENOMEM; | |
260 | ||
295bdd9c | 261 | rtc->regs = of_iomap(op->dev.of_node, 0); |
50aae724 AG |
262 | if (!rtc->regs) { |
263 | dev_err(&op->dev, "%s: couldn't map io space\n", __func__); | |
264 | err = -ENOSYS; | |
265 | goto out_free; | |
266 | } | |
267 | ||
268 | device_init_wakeup(&op->dev, 1); | |
269 | ||
270 | dev_set_drvdata(&op->dev, rtc); | |
271 | ||
295bdd9c | 272 | rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1); |
50aae724 AG |
273 | err = request_irq(rtc->irq, mpc5121_rtc_handler, IRQF_DISABLED, |
274 | "mpc5121-rtc", &op->dev); | |
275 | if (err) { | |
276 | dev_err(&op->dev, "%s: could not request irq: %i\n", | |
277 | __func__, rtc->irq); | |
278 | goto out_dispose; | |
279 | } | |
280 | ||
295bdd9c | 281 | rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0); |
50aae724 AG |
282 | err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd, |
283 | IRQF_DISABLED, "mpc5121-rtc_upd", &op->dev); | |
284 | if (err) { | |
285 | dev_err(&op->dev, "%s: could not request irq: %i\n", | |
286 | __func__, rtc->irq_periodic); | |
287 | goto out_dispose2; | |
288 | } | |
289 | ||
290 | ka = in_be32(&rtc->regs->keep_alive); | |
291 | if (ka & 0x02) { | |
292 | dev_warn(&op->dev, | |
293 | "mpc5121-rtc: Battery or oscillator failure!\n"); | |
294 | out_be32(&rtc->regs->keep_alive, ka); | |
295 | } | |
296 | ||
297 | rtc->rtc = rtc_device_register("mpc5121-rtc", &op->dev, | |
298 | &mpc5121_rtc_ops, THIS_MODULE); | |
299 | if (IS_ERR(rtc->rtc)) { | |
300 | err = PTR_ERR(rtc->rtc); | |
301 | goto out_free_irq; | |
302 | } | |
303 | ||
304 | return 0; | |
305 | ||
306 | out_free_irq: | |
307 | free_irq(rtc->irq_periodic, &op->dev); | |
308 | out_dispose2: | |
309 | irq_dispose_mapping(rtc->irq_periodic); | |
310 | free_irq(rtc->irq, &op->dev); | |
311 | out_dispose: | |
312 | irq_dispose_mapping(rtc->irq); | |
313 | iounmap(rtc->regs); | |
314 | out_free: | |
315 | kfree(rtc); | |
316 | ||
317 | return err; | |
318 | } | |
319 | ||
2dc11581 | 320 | static int __devexit mpc5121_rtc_remove(struct platform_device *op) |
50aae724 AG |
321 | { |
322 | struct mpc5121_rtc_data *rtc = dev_get_drvdata(&op->dev); | |
323 | struct mpc5121_rtc_regs __iomem *regs = rtc->regs; | |
324 | ||
325 | /* disable interrupt, so there are no nasty surprises */ | |
326 | out_8(®s->alm_enable, 0); | |
327 | out_8(®s->int_enable, in_8(®s->int_enable) & ~0x1); | |
328 | ||
329 | rtc_device_unregister(rtc->rtc); | |
330 | iounmap(rtc->regs); | |
331 | free_irq(rtc->irq, &op->dev); | |
332 | free_irq(rtc->irq_periodic, &op->dev); | |
333 | irq_dispose_mapping(rtc->irq); | |
334 | irq_dispose_mapping(rtc->irq_periodic); | |
335 | dev_set_drvdata(&op->dev, NULL); | |
336 | kfree(rtc); | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | static struct of_device_id mpc5121_rtc_match[] __devinitdata = { | |
342 | { .compatible = "fsl,mpc5121-rtc", }, | |
343 | {}, | |
344 | }; | |
345 | ||
1c48a5c9 | 346 | static struct platform_driver mpc5121_rtc_driver = { |
295bdd9c GL |
347 | .driver = { |
348 | .name = "mpc5121-rtc", | |
349 | .owner = THIS_MODULE, | |
350 | .of_match_table = mpc5121_rtc_match, | |
351 | }, | |
50aae724 AG |
352 | .probe = mpc5121_rtc_probe, |
353 | .remove = __devexit_p(mpc5121_rtc_remove), | |
354 | }; | |
355 | ||
356 | static int __init mpc5121_rtc_init(void) | |
357 | { | |
1c48a5c9 | 358 | return platform_driver_register(&mpc5121_rtc_driver); |
50aae724 AG |
359 | } |
360 | module_init(mpc5121_rtc_init); | |
361 | ||
362 | static void __exit mpc5121_rtc_exit(void) | |
363 | { | |
1c48a5c9 | 364 | platform_driver_unregister(&mpc5121_rtc_driver); |
50aae724 AG |
365 | } |
366 | module_exit(mpc5121_rtc_exit); | |
367 | ||
368 | MODULE_LICENSE("GPL"); | |
369 | MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>"); |