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Linux/drivers/rtc/rtc-88pm80x.c

  1 /*
  2  * Real Time Clock driver for Marvell 88PM80x PMIC
  3  *
  4  * Copyright (c) 2012 Marvell International Ltd.
  5  *  Wenzeng Chen<wzch@marvell.com>
  6  *  Qiao Zhou <zhouqiao@marvell.com>
  7  *
  8  * This file is subject to the terms and conditions of the GNU General
  9  * Public License. See the file "COPYING" in the main directory of this
 10  * archive for more details.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU General Public License
 18  * along with this program; if not, write to the Free Software
 19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 20  */
 21 
 22 #include <linux/kernel.h>
 23 #include <linux/module.h>
 24 #include <linux/slab.h>
 25 #include <linux/regmap.h>
 26 #include <linux/mfd/core.h>
 27 #include <linux/mfd/88pm80x.h>
 28 #include <linux/rtc.h>
 29 
 30 #define PM800_RTC_COUNTER1              (0xD1)
 31 #define PM800_RTC_COUNTER2              (0xD2)
 32 #define PM800_RTC_COUNTER3              (0xD3)
 33 #define PM800_RTC_COUNTER4              (0xD4)
 34 #define PM800_RTC_EXPIRE1_1             (0xD5)
 35 #define PM800_RTC_EXPIRE1_2             (0xD6)
 36 #define PM800_RTC_EXPIRE1_3             (0xD7)
 37 #define PM800_RTC_EXPIRE1_4             (0xD8)
 38 #define PM800_RTC_TRIM1                 (0xD9)
 39 #define PM800_RTC_TRIM2                 (0xDA)
 40 #define PM800_RTC_TRIM3                 (0xDB)
 41 #define PM800_RTC_TRIM4                 (0xDC)
 42 #define PM800_RTC_EXPIRE2_1             (0xDD)
 43 #define PM800_RTC_EXPIRE2_2             (0xDE)
 44 #define PM800_RTC_EXPIRE2_3             (0xDF)
 45 #define PM800_RTC_EXPIRE2_4             (0xE0)
 46 
 47 #define PM800_POWER_DOWN_LOG1   (0xE5)
 48 #define PM800_POWER_DOWN_LOG2   (0xE6)
 49 
 50 struct pm80x_rtc_info {
 51         struct pm80x_chip *chip;
 52         struct regmap *map;
 53         struct rtc_device *rtc_dev;
 54         struct device *dev;
 55         struct delayed_work calib_work;
 56 
 57         int irq;
 58         int vrtc;
 59 };
 60 
 61 static irqreturn_t rtc_update_handler(int irq, void *data)
 62 {
 63         struct pm80x_rtc_info *info = (struct pm80x_rtc_info *)data;
 64         int mask;
 65 
 66         mask = PM800_ALARM | PM800_ALARM_WAKEUP;
 67         regmap_update_bits(info->map, PM800_RTC_CONTROL, mask | PM800_ALARM1_EN,
 68                            mask);
 69         rtc_update_irq(info->rtc_dev, 1, RTC_AF);
 70         return IRQ_HANDLED;
 71 }
 72 
 73 static int pm80x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 74 {
 75         struct pm80x_rtc_info *info = dev_get_drvdata(dev);
 76 
 77         if (enabled)
 78                 regmap_update_bits(info->map, PM800_RTC_CONTROL,
 79                                    PM800_ALARM1_EN, PM800_ALARM1_EN);
 80         else
 81                 regmap_update_bits(info->map, PM800_RTC_CONTROL,
 82                                    PM800_ALARM1_EN, 0);
 83         return 0;
 84 }
 85 
 86 /*
 87  * Calculate the next alarm time given the requested alarm time mask
 88  * and the current time.
 89  */
 90 static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now,
 91                                 struct rtc_time *alrm)
 92 {
 93         unsigned long next_time;
 94         unsigned long now_time;
 95 
 96         next->tm_year = now->tm_year;
 97         next->tm_mon = now->tm_mon;
 98         next->tm_mday = now->tm_mday;
 99         next->tm_hour = alrm->tm_hour;
100         next->tm_min = alrm->tm_min;
101         next->tm_sec = alrm->tm_sec;
102 
103         rtc_tm_to_time(now, &now_time);
104         rtc_tm_to_time(next, &next_time);
105 
106         if (next_time < now_time) {
107                 /* Advance one day */
108                 next_time += 60 * 60 * 24;
109                 rtc_time_to_tm(next_time, next);
110         }
111 }
112 
113 static int pm80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
114 {
115         struct pm80x_rtc_info *info = dev_get_drvdata(dev);
116         unsigned char buf[4];
117         unsigned long ticks, base, data;
118         regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
119         base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
120         dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
121 
122         /* load 32-bit read-only counter */
123         regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
124         data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
125         ticks = base + data;
126         dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
127                 base, data, ticks);
128         rtc_time_to_tm(ticks, tm);
129         return 0;
130 }
131 
132 static int pm80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
133 {
134         struct pm80x_rtc_info *info = dev_get_drvdata(dev);
135         unsigned char buf[4];
136         unsigned long ticks, base, data;
137         if ((tm->tm_year < 70) || (tm->tm_year > 138)) {
138                 dev_dbg(info->dev,
139                         "Set time %d out of range. Please set time between 1970 to 2038.\n",
140                         1900 + tm->tm_year);
141                 return -EINVAL;
142         }
143         rtc_tm_to_time(tm, &ticks);
144 
145         /* load 32-bit read-only counter */
146         regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
147         data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
148         base = ticks - data;
149         dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
150                 base, data, ticks);
151         buf[0] = base & 0xFF;
152         buf[1] = (base >> 8) & 0xFF;
153         buf[2] = (base >> 16) & 0xFF;
154         buf[3] = (base >> 24) & 0xFF;
155         regmap_raw_write(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
156 
157         return 0;
158 }
159 
160 static int pm80x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
161 {
162         struct pm80x_rtc_info *info = dev_get_drvdata(dev);
163         unsigned char buf[4];
164         unsigned long ticks, base, data;
165         int ret;
166 
167         regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
168         base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
169         dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
170 
171         regmap_raw_read(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
172         data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
173         ticks = base + data;
174         dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
175                 base, data, ticks);
176 
177         rtc_time_to_tm(ticks, &alrm->time);
178         regmap_read(info->map, PM800_RTC_CONTROL, &ret);
179         alrm->enabled = (ret & PM800_ALARM1_EN) ? 1 : 0;
180         alrm->pending = (ret & (PM800_ALARM | PM800_ALARM_WAKEUP)) ? 1 : 0;
181         return 0;
182 }
183 
184 static int pm80x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
185 {
186         struct pm80x_rtc_info *info = dev_get_drvdata(dev);
187         struct rtc_time now_tm, alarm_tm;
188         unsigned long ticks, base, data;
189         unsigned char buf[4];
190         int mask;
191 
192         regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0);
193 
194         regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
195         base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
196         dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
197 
198         /* load 32-bit read-only counter */
199         regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
200         data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
201         ticks = base + data;
202         dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
203                 base, data, ticks);
204 
205         rtc_time_to_tm(ticks, &now_tm);
206         dev_dbg(info->dev, "%s, now time : %lu\n", __func__, ticks);
207         rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time);
208         /* get new ticks for alarm in 24 hours */
209         rtc_tm_to_time(&alarm_tm, &ticks);
210         dev_dbg(info->dev, "%s, alarm time: %lu\n", __func__, ticks);
211         data = ticks - base;
212 
213         buf[0] = data & 0xff;
214         buf[1] = (data >> 8) & 0xff;
215         buf[2] = (data >> 16) & 0xff;
216         buf[3] = (data >> 24) & 0xff;
217         regmap_raw_write(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
218         if (alrm->enabled) {
219                 mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN;
220                 regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, mask);
221         } else {
222                 mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN;
223                 regmap_update_bits(info->map, PM800_RTC_CONTROL, mask,
224                                    PM800_ALARM | PM800_ALARM_WAKEUP);
225         }
226         return 0;
227 }
228 
229 static const struct rtc_class_ops pm80x_rtc_ops = {
230         .read_time = pm80x_rtc_read_time,
231         .set_time = pm80x_rtc_set_time,
232         .read_alarm = pm80x_rtc_read_alarm,
233         .set_alarm = pm80x_rtc_set_alarm,
234         .alarm_irq_enable = pm80x_rtc_alarm_irq_enable,
235 };
236 
237 #ifdef CONFIG_PM_SLEEP
238 static int pm80x_rtc_suspend(struct device *dev)
239 {
240         return pm80x_dev_suspend(dev);
241 }
242 
243 static int pm80x_rtc_resume(struct device *dev)
244 {
245         return pm80x_dev_resume(dev);
246 }
247 #endif
248 
249 static SIMPLE_DEV_PM_OPS(pm80x_rtc_pm_ops, pm80x_rtc_suspend, pm80x_rtc_resume);
250 
251 static int pm80x_rtc_probe(struct platform_device *pdev)
252 {
253         struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
254         struct pm80x_platform_data *pm80x_pdata =
255                                 dev_get_platdata(pdev->dev.parent);
256         struct pm80x_rtc_pdata *pdata = NULL;
257         struct pm80x_rtc_info *info;
258         struct rtc_time tm;
259         unsigned long ticks = 0;
260         int ret;
261 
262         pdata = dev_get_platdata(&pdev->dev);
263         if (pdata == NULL)
264                 dev_warn(&pdev->dev, "No platform data!\n");
265 
266         info =
267             devm_kzalloc(&pdev->dev, sizeof(struct pm80x_rtc_info), GFP_KERNEL);
268         if (!info)
269                 return -ENOMEM;
270         info->irq = platform_get_irq(pdev, 0);
271         if (info->irq < 0) {
272                 dev_err(&pdev->dev, "No IRQ resource!\n");
273                 ret = -EINVAL;
274                 goto out;
275         }
276 
277         info->chip = chip;
278         info->map = chip->regmap;
279         if (!info->map) {
280                 dev_err(&pdev->dev, "no regmap!\n");
281                 ret = -EINVAL;
282                 goto out;
283         }
284 
285         info->dev = &pdev->dev;
286         dev_set_drvdata(&pdev->dev, info);
287 
288         ret = pm80x_request_irq(chip, info->irq, rtc_update_handler,
289                                 IRQF_ONESHOT, "rtc", info);
290         if (ret < 0) {
291                 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
292                         info->irq, ret);
293                 goto out;
294         }
295 
296         ret = pm80x_rtc_read_time(&pdev->dev, &tm);
297         if (ret < 0) {
298                 dev_err(&pdev->dev, "Failed to read initial time.\n");
299                 goto out_rtc;
300         }
301         if ((tm.tm_year < 70) || (tm.tm_year > 138)) {
302                 tm.tm_year = 70;
303                 tm.tm_mon = 0;
304                 tm.tm_mday = 1;
305                 tm.tm_hour = 0;
306                 tm.tm_min = 0;
307                 tm.tm_sec = 0;
308                 ret = pm80x_rtc_set_time(&pdev->dev, &tm);
309                 if (ret < 0) {
310                         dev_err(&pdev->dev, "Failed to set initial time.\n");
311                         goto out_rtc;
312                 }
313         }
314         rtc_tm_to_time(&tm, &ticks);
315 
316         info->rtc_dev = devm_rtc_device_register(&pdev->dev, "88pm80x-rtc",
317                                             &pm80x_rtc_ops, THIS_MODULE);
318         if (IS_ERR(info->rtc_dev)) {
319                 ret = PTR_ERR(info->rtc_dev);
320                 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
321                 goto out_rtc;
322         }
323         /*
324          * enable internal XO instead of internal 3.25MHz clock since it can
325          * free running in PMIC power-down state.
326          */
327         regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_RTC1_USE_XO,
328                            PM800_RTC1_USE_XO);
329 
330         if (pm80x_pdata) {
331                 pdata = pm80x_pdata->rtc;
332                 if (pdata)
333                         info->rtc_dev->dev.platform_data = &pdata->rtc_wakeup;
334         }
335 
336         device_init_wakeup(&pdev->dev, 1);
337 
338         return 0;
339 out_rtc:
340         pm80x_free_irq(chip, info->irq, info);
341 out:
342         return ret;
343 }
344 
345 static int pm80x_rtc_remove(struct platform_device *pdev)
346 {
347         struct pm80x_rtc_info *info = platform_get_drvdata(pdev);
348         pm80x_free_irq(info->chip, info->irq, info);
349         return 0;
350 }
351 
352 static struct platform_driver pm80x_rtc_driver = {
353         .driver = {
354                    .name = "88pm80x-rtc",
355                    .owner = THIS_MODULE,
356                    .pm = &pm80x_rtc_pm_ops,
357                    },
358         .probe = pm80x_rtc_probe,
359         .remove = pm80x_rtc_remove,
360 };
361 
362 module_platform_driver(pm80x_rtc_driver);
363 
364 MODULE_LICENSE("GPL");
365 MODULE_DESCRIPTION("Marvell 88PM80x RTC driver");
366 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
367 MODULE_ALIAS("platform:88pm80x-rtc");
368 

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