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2985c29c QZ |
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); | |
8fc72269 CIK |
119 | base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
120 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
121 | dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]); |
122 | ||
123 | /* load 32-bit read-only counter */ | |
124 | regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4); | |
8fc72269 CIK |
125 | data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
126 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
127 | ticks = base + data; |
128 | dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", | |
129 | base, data, ticks); | |
130 | rtc_time_to_tm(ticks, tm); | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static int pm80x_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
135 | { | |
136 | struct pm80x_rtc_info *info = dev_get_drvdata(dev); | |
137 | unsigned char buf[4]; | |
138 | unsigned long ticks, base, data; | |
139 | if ((tm->tm_year < 70) || (tm->tm_year > 138)) { | |
140 | dev_dbg(info->dev, | |
141 | "Set time %d out of range. Please set time between 1970 to 2038.\n", | |
142 | 1900 + tm->tm_year); | |
143 | return -EINVAL; | |
144 | } | |
145 | rtc_tm_to_time(tm, &ticks); | |
146 | ||
147 | /* load 32-bit read-only counter */ | |
148 | regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4); | |
8fc72269 CIK |
149 | data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
150 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
151 | base = ticks - data; |
152 | dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", | |
153 | base, data, ticks); | |
154 | buf[0] = base & 0xFF; | |
155 | buf[1] = (base >> 8) & 0xFF; | |
156 | buf[2] = (base >> 16) & 0xFF; | |
157 | buf[3] = (base >> 24) & 0xFF; | |
158 | regmap_raw_write(info->map, PM800_RTC_EXPIRE2_1, buf, 4); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static int pm80x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
164 | { | |
165 | struct pm80x_rtc_info *info = dev_get_drvdata(dev); | |
166 | unsigned char buf[4]; | |
167 | unsigned long ticks, base, data; | |
168 | int ret; | |
169 | ||
170 | regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4); | |
8fc72269 CIK |
171 | base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
172 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
173 | dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]); |
174 | ||
175 | regmap_raw_read(info->map, PM800_RTC_EXPIRE1_1, buf, 4); | |
8fc72269 CIK |
176 | data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
177 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
178 | ticks = base + data; |
179 | dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", | |
180 | base, data, ticks); | |
181 | ||
182 | rtc_time_to_tm(ticks, &alrm->time); | |
183 | regmap_read(info->map, PM800_RTC_CONTROL, &ret); | |
184 | alrm->enabled = (ret & PM800_ALARM1_EN) ? 1 : 0; | |
185 | alrm->pending = (ret & (PM800_ALARM | PM800_ALARM_WAKEUP)) ? 1 : 0; | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static int pm80x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
190 | { | |
191 | struct pm80x_rtc_info *info = dev_get_drvdata(dev); | |
192 | struct rtc_time now_tm, alarm_tm; | |
193 | unsigned long ticks, base, data; | |
194 | unsigned char buf[4]; | |
195 | int mask; | |
196 | ||
197 | regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0); | |
198 | ||
199 | regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4); | |
8fc72269 CIK |
200 | base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
201 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
202 | dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]); |
203 | ||
204 | /* load 32-bit read-only counter */ | |
205 | regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4); | |
8fc72269 CIK |
206 | data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
207 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
208 | ticks = base + data; |
209 | dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", | |
210 | base, data, ticks); | |
211 | ||
212 | rtc_time_to_tm(ticks, &now_tm); | |
213 | dev_dbg(info->dev, "%s, now time : %lu\n", __func__, ticks); | |
214 | rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time); | |
215 | /* get new ticks for alarm in 24 hours */ | |
216 | rtc_tm_to_time(&alarm_tm, &ticks); | |
217 | dev_dbg(info->dev, "%s, alarm time: %lu\n", __func__, ticks); | |
218 | data = ticks - base; | |
219 | ||
220 | buf[0] = data & 0xff; | |
221 | buf[1] = (data >> 8) & 0xff; | |
222 | buf[2] = (data >> 16) & 0xff; | |
223 | buf[3] = (data >> 24) & 0xff; | |
224 | regmap_raw_write(info->map, PM800_RTC_EXPIRE1_1, buf, 4); | |
225 | if (alrm->enabled) { | |
226 | mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN; | |
227 | regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, mask); | |
228 | } else { | |
229 | mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN; | |
230 | regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, | |
231 | PM800_ALARM | PM800_ALARM_WAKEUP); | |
232 | } | |
233 | return 0; | |
234 | } | |
235 | ||
236 | static const struct rtc_class_ops pm80x_rtc_ops = { | |
237 | .read_time = pm80x_rtc_read_time, | |
238 | .set_time = pm80x_rtc_set_time, | |
239 | .read_alarm = pm80x_rtc_read_alarm, | |
240 | .set_alarm = pm80x_rtc_set_alarm, | |
241 | .alarm_irq_enable = pm80x_rtc_alarm_irq_enable, | |
242 | }; | |
243 | ||
569b05a3 | 244 | #ifdef CONFIG_PM_SLEEP |
2985c29c QZ |
245 | static int pm80x_rtc_suspend(struct device *dev) |
246 | { | |
247 | return pm80x_dev_suspend(dev); | |
248 | } | |
249 | ||
250 | static int pm80x_rtc_resume(struct device *dev) | |
251 | { | |
252 | return pm80x_dev_resume(dev); | |
253 | } | |
254 | #endif | |
255 | ||
256 | static SIMPLE_DEV_PM_OPS(pm80x_rtc_pm_ops, pm80x_rtc_suspend, pm80x_rtc_resume); | |
257 | ||
5a167f45 | 258 | static int pm80x_rtc_probe(struct platform_device *pdev) |
2985c29c QZ |
259 | { |
260 | struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
4ab82103 | 261 | struct pm80x_rtc_pdata *pdata = dev_get_platdata(&pdev->dev); |
2985c29c | 262 | struct pm80x_rtc_info *info; |
4ab82103 | 263 | struct device_node *node = pdev->dev.of_node; |
2985c29c QZ |
264 | struct rtc_time tm; |
265 | unsigned long ticks = 0; | |
266 | int ret; | |
267 | ||
4ab82103 VH |
268 | if (!pdata && !node) { |
269 | dev_err(&pdev->dev, | |
270 | "pm80x-rtc requires platform data or of_node\n"); | |
271 | return -EINVAL; | |
272 | } | |
273 | ||
274 | if (!pdata) { | |
275 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
276 | if (!pdata) { | |
277 | dev_err(&pdev->dev, "failed to allocate memory\n"); | |
278 | return -ENOMEM; | |
279 | } | |
280 | } | |
2985c29c QZ |
281 | |
282 | info = | |
283 | devm_kzalloc(&pdev->dev, sizeof(struct pm80x_rtc_info), GFP_KERNEL); | |
284 | if (!info) | |
285 | return -ENOMEM; | |
286 | info->irq = platform_get_irq(pdev, 0); | |
287 | if (info->irq < 0) { | |
288 | dev_err(&pdev->dev, "No IRQ resource!\n"); | |
289 | ret = -EINVAL; | |
290 | goto out; | |
291 | } | |
292 | ||
293 | info->chip = chip; | |
294 | info->map = chip->regmap; | |
295 | if (!info->map) { | |
296 | dev_err(&pdev->dev, "no regmap!\n"); | |
297 | ret = -EINVAL; | |
298 | goto out; | |
299 | } | |
300 | ||
301 | info->dev = &pdev->dev; | |
302 | dev_set_drvdata(&pdev->dev, info); | |
303 | ||
304 | ret = pm80x_request_irq(chip, info->irq, rtc_update_handler, | |
305 | IRQF_ONESHOT, "rtc", info); | |
306 | if (ret < 0) { | |
307 | dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", | |
308 | info->irq, ret); | |
309 | goto out; | |
310 | } | |
311 | ||
312 | ret = pm80x_rtc_read_time(&pdev->dev, &tm); | |
313 | if (ret < 0) { | |
314 | dev_err(&pdev->dev, "Failed to read initial time.\n"); | |
315 | goto out_rtc; | |
316 | } | |
317 | if ((tm.tm_year < 70) || (tm.tm_year > 138)) { | |
318 | tm.tm_year = 70; | |
319 | tm.tm_mon = 0; | |
320 | tm.tm_mday = 1; | |
321 | tm.tm_hour = 0; | |
322 | tm.tm_min = 0; | |
323 | tm.tm_sec = 0; | |
324 | ret = pm80x_rtc_set_time(&pdev->dev, &tm); | |
325 | if (ret < 0) { | |
326 | dev_err(&pdev->dev, "Failed to set initial time.\n"); | |
327 | goto out_rtc; | |
328 | } | |
329 | } | |
330 | rtc_tm_to_time(&tm, &ticks); | |
331 | ||
e3c89668 | 332 | info->rtc_dev = devm_rtc_device_register(&pdev->dev, "88pm80x-rtc", |
2985c29c | 333 | &pm80x_rtc_ops, THIS_MODULE); |
2985c29c | 334 | if (IS_ERR(info->rtc_dev)) { |
7ead5511 | 335 | ret = PTR_ERR(info->rtc_dev); |
2985c29c QZ |
336 | dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); |
337 | goto out_rtc; | |
338 | } | |
339 | /* | |
340 | * enable internal XO instead of internal 3.25MHz clock since it can | |
341 | * free running in PMIC power-down state. | |
342 | */ | |
343 | regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_RTC1_USE_XO, | |
344 | PM800_RTC1_USE_XO); | |
345 | ||
4ab82103 VH |
346 | /* remember whether this power up is caused by PMIC RTC or not */ |
347 | info->rtc_dev->dev.platform_data = &pdata->rtc_wakeup; | |
2985c29c QZ |
348 | |
349 | device_init_wakeup(&pdev->dev, 1); | |
350 | ||
351 | return 0; | |
352 | out_rtc: | |
353 | pm80x_free_irq(chip, info->irq, info); | |
354 | out: | |
2985c29c QZ |
355 | return ret; |
356 | } | |
357 | ||
5a167f45 | 358 | static int pm80x_rtc_remove(struct platform_device *pdev) |
2985c29c QZ |
359 | { |
360 | struct pm80x_rtc_info *info = platform_get_drvdata(pdev); | |
2985c29c | 361 | pm80x_free_irq(info->chip, info->irq, info); |
2985c29c QZ |
362 | return 0; |
363 | } | |
364 | ||
365 | static struct platform_driver pm80x_rtc_driver = { | |
366 | .driver = { | |
367 | .name = "88pm80x-rtc", | |
2985c29c QZ |
368 | .pm = &pm80x_rtc_pm_ops, |
369 | }, | |
370 | .probe = pm80x_rtc_probe, | |
5a167f45 | 371 | .remove = pm80x_rtc_remove, |
2985c29c QZ |
372 | }; |
373 | ||
374 | module_platform_driver(pm80x_rtc_driver); | |
375 | ||
376 | MODULE_LICENSE("GPL"); | |
377 | MODULE_DESCRIPTION("Marvell 88PM80x RTC driver"); | |
378 | MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>"); | |
379 | MODULE_ALIAS("platform:88pm80x-rtc"); |