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1/*
2 * drivers/rtc/rtc-spear.c
3 *
4 * Copyright (C) 2010 ST Microelectronics
5 * Rajeev Kumar<rajeev-dlh.kumar@st.com>
6 *
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
10 */
11
12#include <linux/bcd.h>
13#include <linux/clk.h>
14#include <linux/delay.h>
15#include <linux/init.h>
16#include <linux/io.h>
17#include <linux/irq.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/platform_device.h>
21#include <linux/rtc.h>
22#include <linux/slab.h>
23#include <linux/spinlock.h>
24
25/* RTC registers */
26#define TIME_REG 0x00
27#define DATE_REG 0x04
28#define ALARM_TIME_REG 0x08
29#define ALARM_DATE_REG 0x0C
30#define CTRL_REG 0x10
31#define STATUS_REG 0x14
32
33/* TIME_REG & ALARM_TIME_REG */
34#define SECONDS_UNITS (0xf<<0) /* seconds units position */
35#define SECONDS_TENS (0x7<<4) /* seconds tens position */
36#define MINUTES_UNITS (0xf<<8) /* minutes units position */
37#define MINUTES_TENS (0x7<<12) /* minutes tens position */
38#define HOURS_UNITS (0xf<<16) /* hours units position */
39#define HOURS_TENS (0x3<<20) /* hours tens position */
40
41/* DATE_REG & ALARM_DATE_REG */
42#define DAYS_UNITS (0xf<<0) /* days units position */
43#define DAYS_TENS (0x3<<4) /* days tens position */
44#define MONTHS_UNITS (0xf<<8) /* months units position */
45#define MONTHS_TENS (0x1<<12) /* months tens position */
46#define YEARS_UNITS (0xf<<16) /* years units position */
47#define YEARS_TENS (0xf<<20) /* years tens position */
48#define YEARS_HUNDREDS (0xf<<24) /* years hundereds position */
49#define YEARS_MILLENIUMS (0xf<<28) /* years millenium position */
50
51/* MASK SHIFT TIME_REG & ALARM_TIME_REG*/
52#define SECOND_SHIFT 0x00 /* seconds units */
53#define MINUTE_SHIFT 0x08 /* minutes units position */
54#define HOUR_SHIFT 0x10 /* hours units position */
55#define MDAY_SHIFT 0x00 /* Month day shift */
56#define MONTH_SHIFT 0x08 /* Month shift */
57#define YEAR_SHIFT 0x10 /* Year shift */
58
59#define SECOND_MASK 0x7F
60#define MIN_MASK 0x7F
61#define HOUR_MASK 0x3F
62#define DAY_MASK 0x3F
63#define MONTH_MASK 0x7F
64#define YEAR_MASK 0xFFFF
65
66/* date reg equal to time reg, for debug only */
67#define TIME_BYP (1<<9)
68#define INT_ENABLE (1<<31) /* interrupt enable */
69
70/* STATUS_REG */
71#define CLK_UNCONNECTED (1<<0)
72#define PEND_WR_TIME (1<<2)
73#define PEND_WR_DATE (1<<3)
74#define LOST_WR_TIME (1<<4)
75#define LOST_WR_DATE (1<<5)
76#define RTC_INT_MASK (1<<31)
77#define STATUS_BUSY (PEND_WR_TIME | PEND_WR_DATE)
78#define STATUS_FAIL (LOST_WR_TIME | LOST_WR_DATE)
79
80struct spear_rtc_config {
81 struct rtc_device *rtc;
82 struct clk *clk;
83 spinlock_t lock;
84 void __iomem *ioaddr;
85 unsigned int irq_wake;
86};
87
88static inline void spear_rtc_clear_interrupt(struct spear_rtc_config *config)
89{
90 unsigned int val;
91 unsigned long flags;
92
93 spin_lock_irqsave(&config->lock, flags);
94 val = readl(config->ioaddr + STATUS_REG);
95 val |= RTC_INT_MASK;
96 writel(val, config->ioaddr + STATUS_REG);
97 spin_unlock_irqrestore(&config->lock, flags);
98}
99
100static inline void spear_rtc_enable_interrupt(struct spear_rtc_config *config)
101{
102 unsigned int val;
103
104 val = readl(config->ioaddr + CTRL_REG);
105 if (!(val & INT_ENABLE)) {
106 spear_rtc_clear_interrupt(config);
107 val |= INT_ENABLE;
108 writel(val, config->ioaddr + CTRL_REG);
109 }
110}
111
112static inline void spear_rtc_disable_interrupt(struct spear_rtc_config *config)
113{
114 unsigned int val;
115
116 val = readl(config->ioaddr + CTRL_REG);
117 if (val & INT_ENABLE) {
118 val &= ~INT_ENABLE;
119 writel(val, config->ioaddr + CTRL_REG);
120 }
121}
122
123static inline int is_write_complete(struct spear_rtc_config *config)
124{
125 int ret = 0;
126 unsigned long flags;
127
128 spin_lock_irqsave(&config->lock, flags);
129 if ((readl(config->ioaddr + STATUS_REG)) & STATUS_FAIL)
130 ret = -EIO;
131 spin_unlock_irqrestore(&config->lock, flags);
132
133 return ret;
134}
135
136static void rtc_wait_not_busy(struct spear_rtc_config *config)
137{
138 int status, count = 0;
139 unsigned long flags;
140
141 /* Assuming BUSY may stay active for 80 msec) */
142 for (count = 0; count < 80; count++) {
143 spin_lock_irqsave(&config->lock, flags);
144 status = readl(config->ioaddr + STATUS_REG);
145 spin_unlock_irqrestore(&config->lock, flags);
146 if ((status & STATUS_BUSY) == 0)
147 break;
148 /* check status busy, after each msec */
149 msleep(1);
150 }
151}
152
153static irqreturn_t spear_rtc_irq(int irq, void *dev_id)
154{
155 struct spear_rtc_config *config = dev_id;
156 unsigned long flags, events = 0;
157 unsigned int irq_data;
158
159 spin_lock_irqsave(&config->lock, flags);
160 irq_data = readl(config->ioaddr + STATUS_REG);
161 spin_unlock_irqrestore(&config->lock, flags);
162
163 if ((irq_data & RTC_INT_MASK)) {
164 spear_rtc_clear_interrupt(config);
165 events = RTC_IRQF | RTC_AF;
166 rtc_update_irq(config->rtc, 1, events);
167 return IRQ_HANDLED;
168 } else
169 return IRQ_NONE;
170
171}
172
173static void tm2bcd(struct rtc_time *tm)
174{
175 tm->tm_sec = bin2bcd(tm->tm_sec);
176 tm->tm_min = bin2bcd(tm->tm_min);
177 tm->tm_hour = bin2bcd(tm->tm_hour);
178 tm->tm_mday = bin2bcd(tm->tm_mday);
179 tm->tm_mon = bin2bcd(tm->tm_mon + 1);
180 tm->tm_year = bin2bcd(tm->tm_year);
181}
182
183static void bcd2tm(struct rtc_time *tm)
184{
185 tm->tm_sec = bcd2bin(tm->tm_sec);
186 tm->tm_min = bcd2bin(tm->tm_min);
187 tm->tm_hour = bcd2bin(tm->tm_hour);
188 tm->tm_mday = bcd2bin(tm->tm_mday);
189 tm->tm_mon = bcd2bin(tm->tm_mon) - 1;
190 /* epoch == 1900 */
191 tm->tm_year = bcd2bin(tm->tm_year);
192}
193
194/*
195 * spear_rtc_read_time - set the time
196 * @dev: rtc device in use
197 * @tm: holds date and time
198 *
199 * This function read time and date. On success it will return 0
200 * otherwise -ve error is returned.
201 */
202static int spear_rtc_read_time(struct device *dev, struct rtc_time *tm)
203{
204 struct spear_rtc_config *config = dev_get_drvdata(dev);
205 unsigned int time, date;
206
207 /* we don't report wday/yday/isdst ... */
208 rtc_wait_not_busy(config);
209
210 time = readl(config->ioaddr + TIME_REG);
211 date = readl(config->ioaddr + DATE_REG);
212 tm->tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK;
213 tm->tm_min = (time >> MINUTE_SHIFT) & MIN_MASK;
214 tm->tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK;
215 tm->tm_mday = (date >> MDAY_SHIFT) & DAY_MASK;
216 tm->tm_mon = (date >> MONTH_SHIFT) & MONTH_MASK;
217 tm->tm_year = (date >> YEAR_SHIFT) & YEAR_MASK;
218
219 bcd2tm(tm);
220 return 0;
221}
222
223/*
224 * spear_rtc_set_time - set the time
225 * @dev: rtc device in use
226 * @tm: holds date and time
227 *
228 * This function set time and date. On success it will return 0
229 * otherwise -ve error is returned.
230 */
231static int spear_rtc_set_time(struct device *dev, struct rtc_time *tm)
232{
233 struct spear_rtc_config *config = dev_get_drvdata(dev);
234 unsigned int time, date;
235
236 tm2bcd(tm);
237
238 rtc_wait_not_busy(config);
239 time = (tm->tm_sec << SECOND_SHIFT) | (tm->tm_min << MINUTE_SHIFT) |
240 (tm->tm_hour << HOUR_SHIFT);
241 date = (tm->tm_mday << MDAY_SHIFT) | (tm->tm_mon << MONTH_SHIFT) |
242 (tm->tm_year << YEAR_SHIFT);
243 writel(time, config->ioaddr + TIME_REG);
244 writel(date, config->ioaddr + DATE_REG);
245
246 return is_write_complete(config);
247}
248
249/*
250 * spear_rtc_read_alarm - read the alarm time
251 * @dev: rtc device in use
252 * @alm: holds alarm date and time
253 *
254 * This function read alarm time and date. On success it will return 0
255 * otherwise -ve error is returned.
256 */
257static int spear_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
258{
259 struct spear_rtc_config *config = dev_get_drvdata(dev);
260 unsigned int time, date;
261
262 rtc_wait_not_busy(config);
263
264 time = readl(config->ioaddr + ALARM_TIME_REG);
265 date = readl(config->ioaddr + ALARM_DATE_REG);
266 alm->time.tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK;
267 alm->time.tm_min = (time >> MINUTE_SHIFT) & MIN_MASK;
268 alm->time.tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK;
269 alm->time.tm_mday = (date >> MDAY_SHIFT) & DAY_MASK;
270 alm->time.tm_mon = (date >> MONTH_SHIFT) & MONTH_MASK;
271 alm->time.tm_year = (date >> YEAR_SHIFT) & YEAR_MASK;
272
273 bcd2tm(&alm->time);
274 alm->enabled = readl(config->ioaddr + CTRL_REG) & INT_ENABLE;
275
276 return 0;
277}
278
279/*
280 * spear_rtc_set_alarm - set the alarm time
281 * @dev: rtc device in use
282 * @alm: holds alarm date and time
283 *
284 * This function set alarm time and date. On success it will return 0
285 * otherwise -ve error is returned.
286 */
287static int spear_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
288{
289 struct spear_rtc_config *config = dev_get_drvdata(dev);
290 unsigned int time, date;
291 int err;
292
293 tm2bcd(&alm->time);
294
295 rtc_wait_not_busy(config);
296
297 time = (alm->time.tm_sec << SECOND_SHIFT) | (alm->time.tm_min <<
298 MINUTE_SHIFT) | (alm->time.tm_hour << HOUR_SHIFT);
299 date = (alm->time.tm_mday << MDAY_SHIFT) | (alm->time.tm_mon <<
300 MONTH_SHIFT) | (alm->time.tm_year << YEAR_SHIFT);
301
302 writel(time, config->ioaddr + ALARM_TIME_REG);
303 writel(date, config->ioaddr + ALARM_DATE_REG);
304 err = is_write_complete(config);
305 if (err < 0)
306 return err;
307
308 if (alm->enabled)
309 spear_rtc_enable_interrupt(config);
310 else
311 spear_rtc_disable_interrupt(config);
312
313 return 0;
314}
315
316static int spear_alarm_irq_enable(struct device *dev, unsigned int enabled)
317{
318 struct spear_rtc_config *config = dev_get_drvdata(dev);
319 int ret = 0;
320
321 spear_rtc_clear_interrupt(config);
322
323 switch (enabled) {
324 case 0:
325 /* alarm off */
326 spear_rtc_disable_interrupt(config);
327 break;
328 case 1:
329 /* alarm on */
330 spear_rtc_enable_interrupt(config);
331 break;
332 default:
333 ret = -EINVAL;
334 break;
335 }
336
337 return ret;
338}
339
340static const struct rtc_class_ops spear_rtc_ops = {
341 .read_time = spear_rtc_read_time,
342 .set_time = spear_rtc_set_time,
343 .read_alarm = spear_rtc_read_alarm,
344 .set_alarm = spear_rtc_set_alarm,
345 .alarm_irq_enable = spear_alarm_irq_enable,
346};
347
348static int spear_rtc_probe(struct platform_device *pdev)
349{
350 struct spear_rtc_config *config;
351 int status = 0;
352 int irq;
353
354 config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL);
355 if (!config)
356 return -ENOMEM;
357
358 /* alarm irqs */
359 irq = platform_get_irq(pdev, 0);
360 if (irq < 0)
361 return irq;
362
363 status = devm_request_irq(&pdev->dev, irq, spear_rtc_irq, 0, pdev->name,
364 config);
365 if (status) {
366 dev_err(&pdev->dev, "Alarm interrupt IRQ%d already claimed\n",
367 irq);
368 return status;
369 }
370
371 config->ioaddr = devm_platform_ioremap_resource(pdev, 0);
372 if (IS_ERR(config->ioaddr))
373 return PTR_ERR(config->ioaddr);
374
375 config->clk = devm_clk_get(&pdev->dev, NULL);
376 if (IS_ERR(config->clk))
377 return PTR_ERR(config->clk);
378
379 status = clk_prepare_enable(config->clk);
380 if (status < 0)
381 return status;
382
383 spin_lock_init(&config->lock);
384 platform_set_drvdata(pdev, config);
385
386 config->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
387 &spear_rtc_ops, THIS_MODULE);
388 if (IS_ERR(config->rtc)) {
389 dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
390 PTR_ERR(config->rtc));
391 status = PTR_ERR(config->rtc);
392 goto err_disable_clock;
393 }
394
395 config->rtc->uie_unsupported = 1;
396
397 if (!device_can_wakeup(&pdev->dev))
398 device_init_wakeup(&pdev->dev, 1);
399
400 return 0;
401
402err_disable_clock:
403 clk_disable_unprepare(config->clk);
404
405 return status;
406}
407
408static int spear_rtc_remove(struct platform_device *pdev)
409{
410 struct spear_rtc_config *config = platform_get_drvdata(pdev);
411
412 spear_rtc_disable_interrupt(config);
413 clk_disable_unprepare(config->clk);
414 device_init_wakeup(&pdev->dev, 0);
415
416 return 0;
417}
418
419#ifdef CONFIG_PM_SLEEP
420static int spear_rtc_suspend(struct device *dev)
421{
422 struct platform_device *pdev = to_platform_device(dev);
423 struct spear_rtc_config *config = platform_get_drvdata(pdev);
424 int irq;
425
426 irq = platform_get_irq(pdev, 0);
427 if (device_may_wakeup(&pdev->dev)) {
428 if (!enable_irq_wake(irq))
429 config->irq_wake = 1;
430 } else {
431 spear_rtc_disable_interrupt(config);
432 clk_disable(config->clk);
433 }
434
435 return 0;
436}
437
438static int spear_rtc_resume(struct device *dev)
439{
440 struct platform_device *pdev = to_platform_device(dev);
441 struct spear_rtc_config *config = platform_get_drvdata(pdev);
442 int irq;
443
444 irq = platform_get_irq(pdev, 0);
445
446 if (device_may_wakeup(&pdev->dev)) {
447 if (config->irq_wake) {
448 disable_irq_wake(irq);
449 config->irq_wake = 0;
450 }
451 } else {
452 clk_enable(config->clk);
453 spear_rtc_enable_interrupt(config);
454 }
455
456 return 0;
457}
458#endif
459
460static SIMPLE_DEV_PM_OPS(spear_rtc_pm_ops, spear_rtc_suspend, spear_rtc_resume);
461
462static void spear_rtc_shutdown(struct platform_device *pdev)
463{
464 struct spear_rtc_config *config = platform_get_drvdata(pdev);
465
466 spear_rtc_disable_interrupt(config);
467 clk_disable(config->clk);
468}
469
470#ifdef CONFIG_OF
471static const struct of_device_id spear_rtc_id_table[] = {
472 { .compatible = "st,spear600-rtc" },
473 {}
474};
475MODULE_DEVICE_TABLE(of, spear_rtc_id_table);
476#endif
477
478static struct platform_driver spear_rtc_driver = {
479 .probe = spear_rtc_probe,
480 .remove = spear_rtc_remove,
481 .shutdown = spear_rtc_shutdown,
482 .driver = {
483 .name = "rtc-spear",
484 .pm = &spear_rtc_pm_ops,
485 .of_match_table = of_match_ptr(spear_rtc_id_table),
486 },
487};
488
489module_platform_driver(spear_rtc_driver);
490
491MODULE_ALIAS("platform:rtc-spear");
492MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>");
493MODULE_DESCRIPTION("ST SPEAr Realtime Clock Driver (RTC)");
494MODULE_LICENSE("GPL");
1/*
2 * drivers/rtc/rtc-spear.c
3 *
4 * Copyright (C) 2010 ST Microelectronics
5 * Rajeev Kumar<rajeev-dlh.kumar@st.com>
6 *
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
10 */
11
12#include <linux/bcd.h>
13#include <linux/clk.h>
14#include <linux/delay.h>
15#include <linux/init.h>
16#include <linux/io.h>
17#include <linux/irq.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/platform_device.h>
21#include <linux/rtc.h>
22#include <linux/slab.h>
23#include <linux/spinlock.h>
24
25/* RTC registers */
26#define TIME_REG 0x00
27#define DATE_REG 0x04
28#define ALARM_TIME_REG 0x08
29#define ALARM_DATE_REG 0x0C
30#define CTRL_REG 0x10
31#define STATUS_REG 0x14
32
33/* TIME_REG & ALARM_TIME_REG */
34#define SECONDS_UNITS (0xf<<0) /* seconds units position */
35#define SECONDS_TENS (0x7<<4) /* seconds tens position */
36#define MINUTES_UNITS (0xf<<8) /* minutes units position */
37#define MINUTES_TENS (0x7<<12) /* minutes tens position */
38#define HOURS_UNITS (0xf<<16) /* hours units position */
39#define HOURS_TENS (0x3<<20) /* hours tens position */
40
41/* DATE_REG & ALARM_DATE_REG */
42#define DAYS_UNITS (0xf<<0) /* days units position */
43#define DAYS_TENS (0x3<<4) /* days tens position */
44#define MONTHS_UNITS (0xf<<8) /* months units position */
45#define MONTHS_TENS (0x1<<12) /* months tens position */
46#define YEARS_UNITS (0xf<<16) /* years units position */
47#define YEARS_TENS (0xf<<20) /* years tens position */
48#define YEARS_HUNDREDS (0xf<<24) /* years hundereds position */
49#define YEARS_MILLENIUMS (0xf<<28) /* years millenium position */
50
51/* MASK SHIFT TIME_REG & ALARM_TIME_REG*/
52#define SECOND_SHIFT 0x00 /* seconds units */
53#define MINUTE_SHIFT 0x08 /* minutes units position */
54#define HOUR_SHIFT 0x10 /* hours units position */
55#define MDAY_SHIFT 0x00 /* Month day shift */
56#define MONTH_SHIFT 0x08 /* Month shift */
57#define YEAR_SHIFT 0x10 /* Year shift */
58
59#define SECOND_MASK 0x7F
60#define MIN_MASK 0x7F
61#define HOUR_MASK 0x3F
62#define DAY_MASK 0x3F
63#define MONTH_MASK 0x7F
64#define YEAR_MASK 0xFFFF
65
66/* date reg equal to time reg, for debug only */
67#define TIME_BYP (1<<9)
68#define INT_ENABLE (1<<31) /* interrupt enable */
69
70/* STATUS_REG */
71#define CLK_UNCONNECTED (1<<0)
72#define PEND_WR_TIME (1<<2)
73#define PEND_WR_DATE (1<<3)
74#define LOST_WR_TIME (1<<4)
75#define LOST_WR_DATE (1<<5)
76#define RTC_INT_MASK (1<<31)
77#define STATUS_BUSY (PEND_WR_TIME | PEND_WR_DATE)
78#define STATUS_FAIL (LOST_WR_TIME | LOST_WR_DATE)
79
80struct spear_rtc_config {
81 struct rtc_device *rtc;
82 struct clk *clk;
83 spinlock_t lock;
84 void __iomem *ioaddr;
85 unsigned int irq_wake;
86};
87
88static inline void spear_rtc_clear_interrupt(struct spear_rtc_config *config)
89{
90 unsigned int val;
91 unsigned long flags;
92
93 spin_lock_irqsave(&config->lock, flags);
94 val = readl(config->ioaddr + STATUS_REG);
95 val |= RTC_INT_MASK;
96 writel(val, config->ioaddr + STATUS_REG);
97 spin_unlock_irqrestore(&config->lock, flags);
98}
99
100static inline void spear_rtc_enable_interrupt(struct spear_rtc_config *config)
101{
102 unsigned int val;
103
104 val = readl(config->ioaddr + CTRL_REG);
105 if (!(val & INT_ENABLE)) {
106 spear_rtc_clear_interrupt(config);
107 val |= INT_ENABLE;
108 writel(val, config->ioaddr + CTRL_REG);
109 }
110}
111
112static inline void spear_rtc_disable_interrupt(struct spear_rtc_config *config)
113{
114 unsigned int val;
115
116 val = readl(config->ioaddr + CTRL_REG);
117 if (val & INT_ENABLE) {
118 val &= ~INT_ENABLE;
119 writel(val, config->ioaddr + CTRL_REG);
120 }
121}
122
123static inline int is_write_complete(struct spear_rtc_config *config)
124{
125 int ret = 0;
126 unsigned long flags;
127
128 spin_lock_irqsave(&config->lock, flags);
129 if ((readl(config->ioaddr + STATUS_REG)) & STATUS_FAIL)
130 ret = -EIO;
131 spin_unlock_irqrestore(&config->lock, flags);
132
133 return ret;
134}
135
136static void rtc_wait_not_busy(struct spear_rtc_config *config)
137{
138 int status, count = 0;
139 unsigned long flags;
140
141 /* Assuming BUSY may stay active for 80 msec) */
142 for (count = 0; count < 80; count++) {
143 spin_lock_irqsave(&config->lock, flags);
144 status = readl(config->ioaddr + STATUS_REG);
145 spin_unlock_irqrestore(&config->lock, flags);
146 if ((status & STATUS_BUSY) == 0)
147 break;
148 /* check status busy, after each msec */
149 msleep(1);
150 }
151}
152
153static irqreturn_t spear_rtc_irq(int irq, void *dev_id)
154{
155 struct spear_rtc_config *config = dev_id;
156 unsigned long flags, events = 0;
157 unsigned int irq_data;
158
159 spin_lock_irqsave(&config->lock, flags);
160 irq_data = readl(config->ioaddr + STATUS_REG);
161 spin_unlock_irqrestore(&config->lock, flags);
162
163 if ((irq_data & RTC_INT_MASK)) {
164 spear_rtc_clear_interrupt(config);
165 events = RTC_IRQF | RTC_AF;
166 rtc_update_irq(config->rtc, 1, events);
167 return IRQ_HANDLED;
168 } else
169 return IRQ_NONE;
170
171}
172
173static int tm2bcd(struct rtc_time *tm)
174{
175 if (rtc_valid_tm(tm) != 0)
176 return -EINVAL;
177 tm->tm_sec = bin2bcd(tm->tm_sec);
178 tm->tm_min = bin2bcd(tm->tm_min);
179 tm->tm_hour = bin2bcd(tm->tm_hour);
180 tm->tm_mday = bin2bcd(tm->tm_mday);
181 tm->tm_mon = bin2bcd(tm->tm_mon + 1);
182 tm->tm_year = bin2bcd(tm->tm_year);
183
184 return 0;
185}
186
187static void bcd2tm(struct rtc_time *tm)
188{
189 tm->tm_sec = bcd2bin(tm->tm_sec);
190 tm->tm_min = bcd2bin(tm->tm_min);
191 tm->tm_hour = bcd2bin(tm->tm_hour);
192 tm->tm_mday = bcd2bin(tm->tm_mday);
193 tm->tm_mon = bcd2bin(tm->tm_mon) - 1;
194 /* epoch == 1900 */
195 tm->tm_year = bcd2bin(tm->tm_year);
196}
197
198/*
199 * spear_rtc_read_time - set the time
200 * @dev: rtc device in use
201 * @tm: holds date and time
202 *
203 * This function read time and date. On success it will return 0
204 * otherwise -ve error is returned.
205 */
206static int spear_rtc_read_time(struct device *dev, struct rtc_time *tm)
207{
208 struct spear_rtc_config *config = dev_get_drvdata(dev);
209 unsigned int time, date;
210
211 /* we don't report wday/yday/isdst ... */
212 rtc_wait_not_busy(config);
213
214 time = readl(config->ioaddr + TIME_REG);
215 date = readl(config->ioaddr + DATE_REG);
216 tm->tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK;
217 tm->tm_min = (time >> MINUTE_SHIFT) & MIN_MASK;
218 tm->tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK;
219 tm->tm_mday = (date >> MDAY_SHIFT) & DAY_MASK;
220 tm->tm_mon = (date >> MONTH_SHIFT) & MONTH_MASK;
221 tm->tm_year = (date >> YEAR_SHIFT) & YEAR_MASK;
222
223 bcd2tm(tm);
224 return 0;
225}
226
227/*
228 * spear_rtc_set_time - set the time
229 * @dev: rtc device in use
230 * @tm: holds date and time
231 *
232 * This function set time and date. On success it will return 0
233 * otherwise -ve error is returned.
234 */
235static int spear_rtc_set_time(struct device *dev, struct rtc_time *tm)
236{
237 struct spear_rtc_config *config = dev_get_drvdata(dev);
238 unsigned int time, date;
239
240 if (tm2bcd(tm) < 0)
241 return -EINVAL;
242
243 rtc_wait_not_busy(config);
244 time = (tm->tm_sec << SECOND_SHIFT) | (tm->tm_min << MINUTE_SHIFT) |
245 (tm->tm_hour << HOUR_SHIFT);
246 date = (tm->tm_mday << MDAY_SHIFT) | (tm->tm_mon << MONTH_SHIFT) |
247 (tm->tm_year << YEAR_SHIFT);
248 writel(time, config->ioaddr + TIME_REG);
249 writel(date, config->ioaddr + DATE_REG);
250
251 return is_write_complete(config);
252}
253
254/*
255 * spear_rtc_read_alarm - read the alarm time
256 * @dev: rtc device in use
257 * @alm: holds alarm date and time
258 *
259 * This function read alarm time and date. On success it will return 0
260 * otherwise -ve error is returned.
261 */
262static int spear_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
263{
264 struct spear_rtc_config *config = dev_get_drvdata(dev);
265 unsigned int time, date;
266
267 rtc_wait_not_busy(config);
268
269 time = readl(config->ioaddr + ALARM_TIME_REG);
270 date = readl(config->ioaddr + ALARM_DATE_REG);
271 alm->time.tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK;
272 alm->time.tm_min = (time >> MINUTE_SHIFT) & MIN_MASK;
273 alm->time.tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK;
274 alm->time.tm_mday = (date >> MDAY_SHIFT) & DAY_MASK;
275 alm->time.tm_mon = (date >> MONTH_SHIFT) & MONTH_MASK;
276 alm->time.tm_year = (date >> YEAR_SHIFT) & YEAR_MASK;
277
278 bcd2tm(&alm->time);
279 alm->enabled = readl(config->ioaddr + CTRL_REG) & INT_ENABLE;
280
281 return 0;
282}
283
284/*
285 * spear_rtc_set_alarm - set the alarm time
286 * @dev: rtc device in use
287 * @alm: holds alarm date and time
288 *
289 * This function set alarm time and date. On success it will return 0
290 * otherwise -ve error is returned.
291 */
292static int spear_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
293{
294 struct spear_rtc_config *config = dev_get_drvdata(dev);
295 unsigned int time, date;
296 int err;
297
298 if (tm2bcd(&alm->time) < 0)
299 return -EINVAL;
300
301 rtc_wait_not_busy(config);
302
303 time = (alm->time.tm_sec << SECOND_SHIFT) | (alm->time.tm_min <<
304 MINUTE_SHIFT) | (alm->time.tm_hour << HOUR_SHIFT);
305 date = (alm->time.tm_mday << MDAY_SHIFT) | (alm->time.tm_mon <<
306 MONTH_SHIFT) | (alm->time.tm_year << YEAR_SHIFT);
307
308 writel(time, config->ioaddr + ALARM_TIME_REG);
309 writel(date, config->ioaddr + ALARM_DATE_REG);
310 err = is_write_complete(config);
311 if (err < 0)
312 return err;
313
314 if (alm->enabled)
315 spear_rtc_enable_interrupt(config);
316 else
317 spear_rtc_disable_interrupt(config);
318
319 return 0;
320}
321
322static int spear_alarm_irq_enable(struct device *dev, unsigned int enabled)
323{
324 struct spear_rtc_config *config = dev_get_drvdata(dev);
325 int ret = 0;
326
327 spear_rtc_clear_interrupt(config);
328
329 switch (enabled) {
330 case 0:
331 /* alarm off */
332 spear_rtc_disable_interrupt(config);
333 break;
334 case 1:
335 /* alarm on */
336 spear_rtc_enable_interrupt(config);
337 break;
338 default:
339 ret = -EINVAL;
340 break;
341 }
342
343 return ret;
344}
345
346static struct rtc_class_ops spear_rtc_ops = {
347 .read_time = spear_rtc_read_time,
348 .set_time = spear_rtc_set_time,
349 .read_alarm = spear_rtc_read_alarm,
350 .set_alarm = spear_rtc_set_alarm,
351 .alarm_irq_enable = spear_alarm_irq_enable,
352};
353
354static int spear_rtc_probe(struct platform_device *pdev)
355{
356 struct resource *res;
357 struct spear_rtc_config *config;
358 int status = 0;
359 int irq;
360
361 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
362 if (!res) {
363 dev_err(&pdev->dev, "no resource defined\n");
364 return -EBUSY;
365 }
366
367 config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL);
368 if (!config)
369 return -ENOMEM;
370
371 /* alarm irqs */
372 irq = platform_get_irq(pdev, 0);
373 if (irq < 0) {
374 dev_err(&pdev->dev, "no update irq?\n");
375 return irq;
376 }
377
378 status = devm_request_irq(&pdev->dev, irq, spear_rtc_irq, 0, pdev->name,
379 config);
380 if (status) {
381 dev_err(&pdev->dev, "Alarm interrupt IRQ%d already claimed\n",
382 irq);
383 return status;
384 }
385
386 config->ioaddr = devm_ioremap_resource(&pdev->dev, res);
387 if (IS_ERR(config->ioaddr))
388 return PTR_ERR(config->ioaddr);
389
390 config->clk = devm_clk_get(&pdev->dev, NULL);
391 if (IS_ERR(config->clk))
392 return PTR_ERR(config->clk);
393
394 status = clk_prepare_enable(config->clk);
395 if (status < 0)
396 return status;
397
398 spin_lock_init(&config->lock);
399 platform_set_drvdata(pdev, config);
400
401 config->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
402 &spear_rtc_ops, THIS_MODULE);
403 if (IS_ERR(config->rtc)) {
404 dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
405 PTR_ERR(config->rtc));
406 status = PTR_ERR(config->rtc);
407 goto err_disable_clock;
408 }
409
410 config->rtc->uie_unsupported = 1;
411
412 if (!device_can_wakeup(&pdev->dev))
413 device_init_wakeup(&pdev->dev, 1);
414
415 return 0;
416
417err_disable_clock:
418 clk_disable_unprepare(config->clk);
419
420 return status;
421}
422
423static int spear_rtc_remove(struct platform_device *pdev)
424{
425 struct spear_rtc_config *config = platform_get_drvdata(pdev);
426
427 spear_rtc_disable_interrupt(config);
428 clk_disable_unprepare(config->clk);
429 device_init_wakeup(&pdev->dev, 0);
430
431 return 0;
432}
433
434#ifdef CONFIG_PM_SLEEP
435static int spear_rtc_suspend(struct device *dev)
436{
437 struct platform_device *pdev = to_platform_device(dev);
438 struct spear_rtc_config *config = platform_get_drvdata(pdev);
439 int irq;
440
441 irq = platform_get_irq(pdev, 0);
442 if (device_may_wakeup(&pdev->dev)) {
443 if (!enable_irq_wake(irq))
444 config->irq_wake = 1;
445 } else {
446 spear_rtc_disable_interrupt(config);
447 clk_disable(config->clk);
448 }
449
450 return 0;
451}
452
453static int spear_rtc_resume(struct device *dev)
454{
455 struct platform_device *pdev = to_platform_device(dev);
456 struct spear_rtc_config *config = platform_get_drvdata(pdev);
457 int irq;
458
459 irq = platform_get_irq(pdev, 0);
460
461 if (device_may_wakeup(&pdev->dev)) {
462 if (config->irq_wake) {
463 disable_irq_wake(irq);
464 config->irq_wake = 0;
465 }
466 } else {
467 clk_enable(config->clk);
468 spear_rtc_enable_interrupt(config);
469 }
470
471 return 0;
472}
473#endif
474
475static SIMPLE_DEV_PM_OPS(spear_rtc_pm_ops, spear_rtc_suspend, spear_rtc_resume);
476
477static void spear_rtc_shutdown(struct platform_device *pdev)
478{
479 struct spear_rtc_config *config = platform_get_drvdata(pdev);
480
481 spear_rtc_disable_interrupt(config);
482 clk_disable(config->clk);
483}
484
485#ifdef CONFIG_OF
486static const struct of_device_id spear_rtc_id_table[] = {
487 { .compatible = "st,spear600-rtc" },
488 {}
489};
490MODULE_DEVICE_TABLE(of, spear_rtc_id_table);
491#endif
492
493static struct platform_driver spear_rtc_driver = {
494 .probe = spear_rtc_probe,
495 .remove = spear_rtc_remove,
496 .shutdown = spear_rtc_shutdown,
497 .driver = {
498 .name = "rtc-spear",
499 .pm = &spear_rtc_pm_ops,
500 .of_match_table = of_match_ptr(spear_rtc_id_table),
501 },
502};
503
504module_platform_driver(spear_rtc_driver);
505
506MODULE_ALIAS("platform:rtc-spear");
507MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>");
508MODULE_DESCRIPTION("ST SPEAr Realtime Clock Driver (RTC)");
509MODULE_LICENSE("GPL");