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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Real-time clock driver for MPC5121
4 *
5 * Copyright 2007, Domen Puncer <domen.puncer@telargo.com>
6 * Copyright 2008, Freescale Semiconductor, Inc. All rights reserved.
7 * Copyright 2011, Dmitry Eremin-Solenikov
8 */
9
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/rtc.h>
13#include <linux/of.h>
14#include <linux/of_irq.h>
15#include <linux/platform_device.h>
16#include <linux/io.h>
17#include <linux/slab.h>
18
19struct mpc5121_rtc_regs {
20 u8 set_time; /* RTC + 0x00 */
21 u8 hour_set; /* RTC + 0x01 */
22 u8 minute_set; /* RTC + 0x02 */
23 u8 second_set; /* RTC + 0x03 */
24
25 u8 set_date; /* RTC + 0x04 */
26 u8 month_set; /* RTC + 0x05 */
27 u8 weekday_set; /* RTC + 0x06 */
28 u8 date_set; /* RTC + 0x07 */
29
30 u8 write_sw; /* RTC + 0x08 */
31 u8 sw_set; /* RTC + 0x09 */
32 u16 year_set; /* RTC + 0x0a */
33
34 u8 alm_enable; /* RTC + 0x0c */
35 u8 alm_hour_set; /* RTC + 0x0d */
36 u8 alm_min_set; /* RTC + 0x0e */
37 u8 int_enable; /* RTC + 0x0f */
38
39 u8 reserved1;
40 u8 hour; /* RTC + 0x11 */
41 u8 minute; /* RTC + 0x12 */
42 u8 second; /* RTC + 0x13 */
43
44 u8 month; /* RTC + 0x14 */
45 u8 wday_mday; /* RTC + 0x15 */
46 u16 year; /* RTC + 0x16 */
47
48 u8 int_alm; /* RTC + 0x18 */
49 u8 int_sw; /* RTC + 0x19 */
50 u8 alm_status; /* RTC + 0x1a */
51 u8 sw_minute; /* RTC + 0x1b */
52
53 u8 bus_error_1; /* RTC + 0x1c */
54 u8 int_day; /* RTC + 0x1d */
55 u8 int_min; /* RTC + 0x1e */
56 u8 int_sec; /* RTC + 0x1f */
57
58 /*
59 * target_time:
60 * intended to be used for hibernation but hibernation
61 * does not work on silicon rev 1.5 so use it for non-volatile
62 * storage of offset between the actual_time register and linux
63 * time
64 */
65 u32 target_time; /* RTC + 0x20 */
66 /*
67 * actual_time:
68 * readonly time since VBAT_RTC was last connected
69 */
70 u32 actual_time; /* RTC + 0x24 */
71 u32 keep_alive; /* RTC + 0x28 */
72};
73
74struct mpc5121_rtc_data {
75 unsigned irq;
76 unsigned irq_periodic;
77 struct mpc5121_rtc_regs __iomem *regs;
78 struct rtc_device *rtc;
79 struct rtc_wkalrm wkalarm;
80};
81
82/*
83 * Update second/minute/hour registers.
84 *
85 * This is just so alarm will work.
86 */
87static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs,
88 struct rtc_time *tm)
89{
90 out_8(®s->second_set, tm->tm_sec);
91 out_8(®s->minute_set, tm->tm_min);
92 out_8(®s->hour_set, tm->tm_hour);
93
94 /* set time sequence */
95 out_8(®s->set_time, 0x1);
96 out_8(®s->set_time, 0x3);
97 out_8(®s->set_time, 0x1);
98 out_8(®s->set_time, 0x0);
99}
100
101static int mpc5121_rtc_read_time(struct device *dev, struct rtc_time *tm)
102{
103 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
104 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
105 unsigned long now;
106
107 /*
108 * linux time is actual_time plus the offset saved in target_time
109 */
110 now = in_be32(®s->actual_time) + in_be32(®s->target_time);
111
112 rtc_time64_to_tm(now, tm);
113
114 /*
115 * update second minute hour registers
116 * so alarms will work
117 */
118 mpc5121_rtc_update_smh(regs, tm);
119
120 return 0;
121}
122
123static int mpc5121_rtc_set_time(struct device *dev, struct rtc_time *tm)
124{
125 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
126 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
127 unsigned long now;
128
129 /*
130 * The actual_time register is read only so we write the offset
131 * between it and linux time to the target_time register.
132 */
133 now = rtc_tm_to_time64(tm);
134 out_be32(®s->target_time, now - in_be32(®s->actual_time));
135
136 /*
137 * update second minute hour registers
138 * so alarms will work
139 */
140 mpc5121_rtc_update_smh(regs, tm);
141
142 return 0;
143}
144
145static int mpc5200_rtc_read_time(struct device *dev, struct rtc_time *tm)
146{
147 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
148 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
149 int tmp;
150
151 tm->tm_sec = in_8(®s->second);
152 tm->tm_min = in_8(®s->minute);
153
154 /* 12 hour format? */
155 if (in_8(®s->hour) & 0x20)
156 tm->tm_hour = (in_8(®s->hour) >> 1) +
157 (in_8(®s->hour) & 1 ? 12 : 0);
158 else
159 tm->tm_hour = in_8(®s->hour);
160
161 tmp = in_8(®s->wday_mday);
162 tm->tm_mday = tmp & 0x1f;
163 tm->tm_mon = in_8(®s->month) - 1;
164 tm->tm_year = in_be16(®s->year) - 1900;
165 tm->tm_wday = (tmp >> 5) % 7;
166 tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
167 tm->tm_isdst = 0;
168
169 return 0;
170}
171
172static int mpc5200_rtc_set_time(struct device *dev, struct rtc_time *tm)
173{
174 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
175 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
176
177 mpc5121_rtc_update_smh(regs, tm);
178
179 /* date */
180 out_8(®s->month_set, tm->tm_mon + 1);
181 out_8(®s->weekday_set, tm->tm_wday ? tm->tm_wday : 7);
182 out_8(®s->date_set, tm->tm_mday);
183 out_be16(®s->year_set, tm->tm_year + 1900);
184
185 /* set date sequence */
186 out_8(®s->set_date, 0x1);
187 out_8(®s->set_date, 0x3);
188 out_8(®s->set_date, 0x1);
189 out_8(®s->set_date, 0x0);
190
191 return 0;
192}
193
194static int mpc5121_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
195{
196 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
197 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
198
199 *alarm = rtc->wkalarm;
200
201 alarm->pending = in_8(®s->alm_status);
202
203 return 0;
204}
205
206static int mpc5121_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
207{
208 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
209 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
210
211 alarm->time.tm_mday = -1;
212 alarm->time.tm_mon = -1;
213 alarm->time.tm_year = -1;
214
215 out_8(®s->alm_min_set, alarm->time.tm_min);
216 out_8(®s->alm_hour_set, alarm->time.tm_hour);
217
218 out_8(®s->alm_enable, alarm->enabled);
219
220 rtc->wkalarm = *alarm;
221 return 0;
222}
223
224static irqreturn_t mpc5121_rtc_handler(int irq, void *dev)
225{
226 struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev);
227 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
228
229 if (in_8(®s->int_alm)) {
230 /* acknowledge and clear status */
231 out_8(®s->int_alm, 1);
232 out_8(®s->alm_status, 1);
233
234 rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
235 return IRQ_HANDLED;
236 }
237
238 return IRQ_NONE;
239}
240
241static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev)
242{
243 struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev);
244 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
245
246 if (in_8(®s->int_sec) && (in_8(®s->int_enable) & 0x1)) {
247 /* acknowledge */
248 out_8(®s->int_sec, 1);
249
250 rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_UF);
251 return IRQ_HANDLED;
252 }
253
254 return IRQ_NONE;
255}
256
257static int mpc5121_rtc_alarm_irq_enable(struct device *dev,
258 unsigned int enabled)
259{
260 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
261 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
262 int val;
263
264 if (enabled)
265 val = 1;
266 else
267 val = 0;
268
269 out_8(®s->alm_enable, val);
270 rtc->wkalarm.enabled = val;
271
272 return 0;
273}
274
275static const struct rtc_class_ops mpc5121_rtc_ops = {
276 .read_time = mpc5121_rtc_read_time,
277 .set_time = mpc5121_rtc_set_time,
278 .read_alarm = mpc5121_rtc_read_alarm,
279 .set_alarm = mpc5121_rtc_set_alarm,
280 .alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
281};
282
283static const struct rtc_class_ops mpc5200_rtc_ops = {
284 .read_time = mpc5200_rtc_read_time,
285 .set_time = mpc5200_rtc_set_time,
286 .read_alarm = mpc5121_rtc_read_alarm,
287 .set_alarm = mpc5121_rtc_set_alarm,
288 .alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
289};
290
291static int mpc5121_rtc_probe(struct platform_device *op)
292{
293 struct mpc5121_rtc_data *rtc;
294 int err = 0;
295
296 rtc = devm_kzalloc(&op->dev, sizeof(*rtc), GFP_KERNEL);
297 if (!rtc)
298 return -ENOMEM;
299
300 rtc->regs = devm_platform_ioremap_resource(op, 0);
301 if (IS_ERR(rtc->regs)) {
302 dev_err(&op->dev, "%s: couldn't map io space\n", __func__);
303 return PTR_ERR(rtc->regs);
304 }
305
306 device_init_wakeup(&op->dev, 1);
307
308 platform_set_drvdata(op, rtc);
309
310 rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1);
311 err = devm_request_irq(&op->dev, rtc->irq, mpc5121_rtc_handler, 0,
312 "mpc5121-rtc", &op->dev);
313 if (err) {
314 dev_err(&op->dev, "%s: could not request irq: %i\n",
315 __func__, rtc->irq);
316 goto out_dispose;
317 }
318
319 rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0);
320 err = devm_request_irq(&op->dev, rtc->irq_periodic,
321 mpc5121_rtc_handler_upd, 0, "mpc5121-rtc_upd",
322 &op->dev);
323 if (err) {
324 dev_err(&op->dev, "%s: could not request irq: %i\n",
325 __func__, rtc->irq_periodic);
326 goto out_dispose2;
327 }
328
329 rtc->rtc = devm_rtc_allocate_device(&op->dev);
330 if (IS_ERR(rtc->rtc)) {
331 err = PTR_ERR(rtc->rtc);
332 goto out_dispose2;
333 }
334
335 rtc->rtc->ops = &mpc5200_rtc_ops;
336 set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->rtc->features);
337 clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->rtc->features);
338 rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_0000;
339 rtc->rtc->range_max = 65733206399ULL; /* 4052-12-31 23:59:59 */
340
341 if (of_device_is_compatible(op->dev.of_node, "fsl,mpc5121-rtc")) {
342 u32 ka;
343 ka = in_be32(&rtc->regs->keep_alive);
344 if (ka & 0x02) {
345 dev_warn(&op->dev,
346 "mpc5121-rtc: Battery or oscillator failure!\n");
347 out_be32(&rtc->regs->keep_alive, ka);
348 }
349 rtc->rtc->ops = &mpc5121_rtc_ops;
350 /*
351 * This is a limitation of the driver that abuses the target
352 * time register, the actual maximum year for the mpc5121 is
353 * also 4052.
354 */
355 rtc->rtc->range_min = 0;
356 rtc->rtc->range_max = U32_MAX;
357 }
358
359 err = devm_rtc_register_device(rtc->rtc);
360 if (err)
361 goto out_dispose2;
362
363 return 0;
364
365out_dispose2:
366 irq_dispose_mapping(rtc->irq_periodic);
367out_dispose:
368 irq_dispose_mapping(rtc->irq);
369
370 return err;
371}
372
373static void mpc5121_rtc_remove(struct platform_device *op)
374{
375 struct mpc5121_rtc_data *rtc = platform_get_drvdata(op);
376 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
377
378 /* disable interrupt, so there are no nasty surprises */
379 out_8(®s->alm_enable, 0);
380 out_8(®s->int_enable, in_8(®s->int_enable) & ~0x1);
381
382 irq_dispose_mapping(rtc->irq);
383 irq_dispose_mapping(rtc->irq_periodic);
384}
385
386#ifdef CONFIG_OF
387static const struct of_device_id mpc5121_rtc_match[] = {
388 { .compatible = "fsl,mpc5121-rtc", },
389 { .compatible = "fsl,mpc5200-rtc", },
390 {},
391};
392MODULE_DEVICE_TABLE(of, mpc5121_rtc_match);
393#endif
394
395static struct platform_driver mpc5121_rtc_driver = {
396 .driver = {
397 .name = "mpc5121-rtc",
398 .of_match_table = of_match_ptr(mpc5121_rtc_match),
399 },
400 .probe = mpc5121_rtc_probe,
401 .remove = mpc5121_rtc_remove,
402};
403
404module_platform_driver(mpc5121_rtc_driver);
405
406MODULE_DESCRIPTION("Freescale MPC5121 built-in RTC driver");
407MODULE_LICENSE("GPL");
408MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Real-time clock driver for MPC5121
4 *
5 * Copyright 2007, Domen Puncer <domen.puncer@telargo.com>
6 * Copyright 2008, Freescale Semiconductor, Inc. All rights reserved.
7 * Copyright 2011, Dmitry Eremin-Solenikov
8 */
9
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/rtc.h>
13#include <linux/of.h>
14#include <linux/of_address.h>
15#include <linux/of_device.h>
16#include <linux/of_irq.h>
17#include <linux/of_platform.h>
18#include <linux/io.h>
19#include <linux/slab.h>
20
21struct mpc5121_rtc_regs {
22 u8 set_time; /* RTC + 0x00 */
23 u8 hour_set; /* RTC + 0x01 */
24 u8 minute_set; /* RTC + 0x02 */
25 u8 second_set; /* RTC + 0x03 */
26
27 u8 set_date; /* RTC + 0x04 */
28 u8 month_set; /* RTC + 0x05 */
29 u8 weekday_set; /* RTC + 0x06 */
30 u8 date_set; /* RTC + 0x07 */
31
32 u8 write_sw; /* RTC + 0x08 */
33 u8 sw_set; /* RTC + 0x09 */
34 u16 year_set; /* RTC + 0x0a */
35
36 u8 alm_enable; /* RTC + 0x0c */
37 u8 alm_hour_set; /* RTC + 0x0d */
38 u8 alm_min_set; /* RTC + 0x0e */
39 u8 int_enable; /* RTC + 0x0f */
40
41 u8 reserved1;
42 u8 hour; /* RTC + 0x11 */
43 u8 minute; /* RTC + 0x12 */
44 u8 second; /* RTC + 0x13 */
45
46 u8 month; /* RTC + 0x14 */
47 u8 wday_mday; /* RTC + 0x15 */
48 u16 year; /* RTC + 0x16 */
49
50 u8 int_alm; /* RTC + 0x18 */
51 u8 int_sw; /* RTC + 0x19 */
52 u8 alm_status; /* RTC + 0x1a */
53 u8 sw_minute; /* RTC + 0x1b */
54
55 u8 bus_error_1; /* RTC + 0x1c */
56 u8 int_day; /* RTC + 0x1d */
57 u8 int_min; /* RTC + 0x1e */
58 u8 int_sec; /* RTC + 0x1f */
59
60 /*
61 * target_time:
62 * intended to be used for hibernation but hibernation
63 * does not work on silicon rev 1.5 so use it for non-volatile
64 * storage of offset between the actual_time register and linux
65 * time
66 */
67 u32 target_time; /* RTC + 0x20 */
68 /*
69 * actual_time:
70 * readonly time since VBAT_RTC was last connected
71 */
72 u32 actual_time; /* RTC + 0x24 */
73 u32 keep_alive; /* RTC + 0x28 */
74};
75
76struct mpc5121_rtc_data {
77 unsigned irq;
78 unsigned irq_periodic;
79 struct mpc5121_rtc_regs __iomem *regs;
80 struct rtc_device *rtc;
81 struct rtc_wkalrm wkalarm;
82};
83
84/*
85 * Update second/minute/hour registers.
86 *
87 * This is just so alarm will work.
88 */
89static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs,
90 struct rtc_time *tm)
91{
92 out_8(®s->second_set, tm->tm_sec);
93 out_8(®s->minute_set, tm->tm_min);
94 out_8(®s->hour_set, tm->tm_hour);
95
96 /* set time sequence */
97 out_8(®s->set_time, 0x1);
98 out_8(®s->set_time, 0x3);
99 out_8(®s->set_time, 0x1);
100 out_8(®s->set_time, 0x0);
101}
102
103static int mpc5121_rtc_read_time(struct device *dev, struct rtc_time *tm)
104{
105 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
106 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
107 unsigned long now;
108
109 /*
110 * linux time is actual_time plus the offset saved in target_time
111 */
112 now = in_be32(®s->actual_time) + in_be32(®s->target_time);
113
114 rtc_time_to_tm(now, tm);
115
116 /*
117 * update second minute hour registers
118 * so alarms will work
119 */
120 mpc5121_rtc_update_smh(regs, tm);
121
122 return 0;
123}
124
125static int mpc5121_rtc_set_time(struct device *dev, struct rtc_time *tm)
126{
127 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
128 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
129 int ret;
130 unsigned long now;
131
132 /*
133 * The actual_time register is read only so we write the offset
134 * between it and linux time to the target_time register.
135 */
136 ret = rtc_tm_to_time(tm, &now);
137 if (ret == 0)
138 out_be32(®s->target_time, now - in_be32(®s->actual_time));
139
140 /*
141 * update second minute hour registers
142 * so alarms will work
143 */
144 mpc5121_rtc_update_smh(regs, tm);
145
146 return 0;
147}
148
149static int mpc5200_rtc_read_time(struct device *dev, struct rtc_time *tm)
150{
151 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
152 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
153 int tmp;
154
155 tm->tm_sec = in_8(®s->second);
156 tm->tm_min = in_8(®s->minute);
157
158 /* 12 hour format? */
159 if (in_8(®s->hour) & 0x20)
160 tm->tm_hour = (in_8(®s->hour) >> 1) +
161 (in_8(®s->hour) & 1 ? 12 : 0);
162 else
163 tm->tm_hour = in_8(®s->hour);
164
165 tmp = in_8(®s->wday_mday);
166 tm->tm_mday = tmp & 0x1f;
167 tm->tm_mon = in_8(®s->month) - 1;
168 tm->tm_year = in_be16(®s->year) - 1900;
169 tm->tm_wday = (tmp >> 5) % 7;
170 tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
171 tm->tm_isdst = 0;
172
173 return 0;
174}
175
176static int mpc5200_rtc_set_time(struct device *dev, struct rtc_time *tm)
177{
178 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
179 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
180
181 mpc5121_rtc_update_smh(regs, tm);
182
183 /* date */
184 out_8(®s->month_set, tm->tm_mon + 1);
185 out_8(®s->weekday_set, tm->tm_wday ? tm->tm_wday : 7);
186 out_8(®s->date_set, tm->tm_mday);
187 out_be16(®s->year_set, tm->tm_year + 1900);
188
189 /* set date sequence */
190 out_8(®s->set_date, 0x1);
191 out_8(®s->set_date, 0x3);
192 out_8(®s->set_date, 0x1);
193 out_8(®s->set_date, 0x0);
194
195 return 0;
196}
197
198static int mpc5121_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
199{
200 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
201 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
202
203 *alarm = rtc->wkalarm;
204
205 alarm->pending = in_8(®s->alm_status);
206
207 return 0;
208}
209
210static int mpc5121_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
211{
212 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
213 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
214
215 /*
216 * the alarm has no seconds so deal with it
217 */
218 if (alarm->time.tm_sec) {
219 alarm->time.tm_sec = 0;
220 alarm->time.tm_min++;
221 if (alarm->time.tm_min >= 60) {
222 alarm->time.tm_min = 0;
223 alarm->time.tm_hour++;
224 if (alarm->time.tm_hour >= 24)
225 alarm->time.tm_hour = 0;
226 }
227 }
228
229 alarm->time.tm_mday = -1;
230 alarm->time.tm_mon = -1;
231 alarm->time.tm_year = -1;
232
233 out_8(®s->alm_min_set, alarm->time.tm_min);
234 out_8(®s->alm_hour_set, alarm->time.tm_hour);
235
236 out_8(®s->alm_enable, alarm->enabled);
237
238 rtc->wkalarm = *alarm;
239 return 0;
240}
241
242static irqreturn_t mpc5121_rtc_handler(int irq, void *dev)
243{
244 struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev);
245 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
246
247 if (in_8(®s->int_alm)) {
248 /* acknowledge and clear status */
249 out_8(®s->int_alm, 1);
250 out_8(®s->alm_status, 1);
251
252 rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
253 return IRQ_HANDLED;
254 }
255
256 return IRQ_NONE;
257}
258
259static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev)
260{
261 struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev);
262 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
263
264 if (in_8(®s->int_sec) && (in_8(®s->int_enable) & 0x1)) {
265 /* acknowledge */
266 out_8(®s->int_sec, 1);
267
268 rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_UF);
269 return IRQ_HANDLED;
270 }
271
272 return IRQ_NONE;
273}
274
275static int mpc5121_rtc_alarm_irq_enable(struct device *dev,
276 unsigned int enabled)
277{
278 struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
279 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
280 int val;
281
282 if (enabled)
283 val = 1;
284 else
285 val = 0;
286
287 out_8(®s->alm_enable, val);
288 rtc->wkalarm.enabled = val;
289
290 return 0;
291}
292
293static const struct rtc_class_ops mpc5121_rtc_ops = {
294 .read_time = mpc5121_rtc_read_time,
295 .set_time = mpc5121_rtc_set_time,
296 .read_alarm = mpc5121_rtc_read_alarm,
297 .set_alarm = mpc5121_rtc_set_alarm,
298 .alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
299};
300
301static const struct rtc_class_ops mpc5200_rtc_ops = {
302 .read_time = mpc5200_rtc_read_time,
303 .set_time = mpc5200_rtc_set_time,
304 .read_alarm = mpc5121_rtc_read_alarm,
305 .set_alarm = mpc5121_rtc_set_alarm,
306 .alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
307};
308
309static int mpc5121_rtc_probe(struct platform_device *op)
310{
311 struct mpc5121_rtc_data *rtc;
312 int err = 0;
313
314 rtc = devm_kzalloc(&op->dev, sizeof(*rtc), GFP_KERNEL);
315 if (!rtc)
316 return -ENOMEM;
317
318 rtc->regs = of_iomap(op->dev.of_node, 0);
319 if (!rtc->regs) {
320 dev_err(&op->dev, "%s: couldn't map io space\n", __func__);
321 return -ENOSYS;
322 }
323
324 device_init_wakeup(&op->dev, 1);
325
326 platform_set_drvdata(op, rtc);
327
328 rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1);
329 err = request_irq(rtc->irq, mpc5121_rtc_handler, 0,
330 "mpc5121-rtc", &op->dev);
331 if (err) {
332 dev_err(&op->dev, "%s: could not request irq: %i\n",
333 __func__, rtc->irq);
334 goto out_dispose;
335 }
336
337 rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0);
338 err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd,
339 0, "mpc5121-rtc_upd", &op->dev);
340 if (err) {
341 dev_err(&op->dev, "%s: could not request irq: %i\n",
342 __func__, rtc->irq_periodic);
343 goto out_dispose2;
344 }
345
346 if (of_device_is_compatible(op->dev.of_node, "fsl,mpc5121-rtc")) {
347 u32 ka;
348 ka = in_be32(&rtc->regs->keep_alive);
349 if (ka & 0x02) {
350 dev_warn(&op->dev,
351 "mpc5121-rtc: Battery or oscillator failure!\n");
352 out_be32(&rtc->regs->keep_alive, ka);
353 }
354
355 rtc->rtc = devm_rtc_device_register(&op->dev, "mpc5121-rtc",
356 &mpc5121_rtc_ops, THIS_MODULE);
357 } else {
358 rtc->rtc = devm_rtc_device_register(&op->dev, "mpc5200-rtc",
359 &mpc5200_rtc_ops, THIS_MODULE);
360 }
361
362 if (IS_ERR(rtc->rtc)) {
363 err = PTR_ERR(rtc->rtc);
364 goto out_free_irq;
365 }
366 rtc->rtc->uie_unsupported = 1;
367
368 return 0;
369
370out_free_irq:
371 free_irq(rtc->irq_periodic, &op->dev);
372out_dispose2:
373 irq_dispose_mapping(rtc->irq_periodic);
374 free_irq(rtc->irq, &op->dev);
375out_dispose:
376 irq_dispose_mapping(rtc->irq);
377 iounmap(rtc->regs);
378
379 return err;
380}
381
382static int mpc5121_rtc_remove(struct platform_device *op)
383{
384 struct mpc5121_rtc_data *rtc = platform_get_drvdata(op);
385 struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
386
387 /* disable interrupt, so there are no nasty surprises */
388 out_8(®s->alm_enable, 0);
389 out_8(®s->int_enable, in_8(®s->int_enable) & ~0x1);
390
391 iounmap(rtc->regs);
392 free_irq(rtc->irq, &op->dev);
393 free_irq(rtc->irq_periodic, &op->dev);
394 irq_dispose_mapping(rtc->irq);
395 irq_dispose_mapping(rtc->irq_periodic);
396
397 return 0;
398}
399
400#ifdef CONFIG_OF
401static const struct of_device_id mpc5121_rtc_match[] = {
402 { .compatible = "fsl,mpc5121-rtc", },
403 { .compatible = "fsl,mpc5200-rtc", },
404 {},
405};
406MODULE_DEVICE_TABLE(of, mpc5121_rtc_match);
407#endif
408
409static struct platform_driver mpc5121_rtc_driver = {
410 .driver = {
411 .name = "mpc5121-rtc",
412 .of_match_table = of_match_ptr(mpc5121_rtc_match),
413 },
414 .probe = mpc5121_rtc_probe,
415 .remove = mpc5121_rtc_remove,
416};
417
418module_platform_driver(mpc5121_rtc_driver);
419
420MODULE_LICENSE("GPL");
421MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>");