Commit | Line | Data |
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8bc9630a | 1 | // SPDX-License-Identifier: GPL-2.0 |
2985c29c QZ |
2 | /* |
3 | * Real Time Clock driver for Marvell 88PM80x PMIC | |
4 | * | |
5 | * Copyright (c) 2012 Marvell International Ltd. | |
6 | * Wenzeng Chen<wzch@marvell.com> | |
7 | * Qiao Zhou <zhouqiao@marvell.com> | |
2985c29c QZ |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/regmap.h> | |
14 | #include <linux/mfd/core.h> | |
15 | #include <linux/mfd/88pm80x.h> | |
16 | #include <linux/rtc.h> | |
17 | ||
18 | #define PM800_RTC_COUNTER1 (0xD1) | |
19 | #define PM800_RTC_COUNTER2 (0xD2) | |
20 | #define PM800_RTC_COUNTER3 (0xD3) | |
21 | #define PM800_RTC_COUNTER4 (0xD4) | |
22 | #define PM800_RTC_EXPIRE1_1 (0xD5) | |
23 | #define PM800_RTC_EXPIRE1_2 (0xD6) | |
24 | #define PM800_RTC_EXPIRE1_3 (0xD7) | |
25 | #define PM800_RTC_EXPIRE1_4 (0xD8) | |
26 | #define PM800_RTC_TRIM1 (0xD9) | |
27 | #define PM800_RTC_TRIM2 (0xDA) | |
28 | #define PM800_RTC_TRIM3 (0xDB) | |
29 | #define PM800_RTC_TRIM4 (0xDC) | |
30 | #define PM800_RTC_EXPIRE2_1 (0xDD) | |
31 | #define PM800_RTC_EXPIRE2_2 (0xDE) | |
32 | #define PM800_RTC_EXPIRE2_3 (0xDF) | |
33 | #define PM800_RTC_EXPIRE2_4 (0xE0) | |
34 | ||
35 | #define PM800_POWER_DOWN_LOG1 (0xE5) | |
36 | #define PM800_POWER_DOWN_LOG2 (0xE6) | |
37 | ||
38 | struct pm80x_rtc_info { | |
39 | struct pm80x_chip *chip; | |
40 | struct regmap *map; | |
41 | struct rtc_device *rtc_dev; | |
42 | struct device *dev; | |
2985c29c QZ |
43 | |
44 | int irq; | |
2985c29c QZ |
45 | }; |
46 | ||
47 | static irqreturn_t rtc_update_handler(int irq, void *data) | |
48 | { | |
49 | struct pm80x_rtc_info *info = (struct pm80x_rtc_info *)data; | |
50 | int mask; | |
51 | ||
52 | mask = PM800_ALARM | PM800_ALARM_WAKEUP; | |
53 | regmap_update_bits(info->map, PM800_RTC_CONTROL, mask | PM800_ALARM1_EN, | |
54 | mask); | |
55 | rtc_update_irq(info->rtc_dev, 1, RTC_AF); | |
56 | return IRQ_HANDLED; | |
57 | } | |
58 | ||
59 | static int pm80x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
60 | { | |
61 | struct pm80x_rtc_info *info = dev_get_drvdata(dev); | |
62 | ||
63 | if (enabled) | |
64 | regmap_update_bits(info->map, PM800_RTC_CONTROL, | |
65 | PM800_ALARM1_EN, PM800_ALARM1_EN); | |
66 | else | |
67 | regmap_update_bits(info->map, PM800_RTC_CONTROL, | |
68 | PM800_ALARM1_EN, 0); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Calculate the next alarm time given the requested alarm time mask | |
74 | * and the current time. | |
75 | */ | |
76 | static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now, | |
77 | struct rtc_time *alrm) | |
78 | { | |
79 | unsigned long next_time; | |
80 | unsigned long now_time; | |
81 | ||
82 | next->tm_year = now->tm_year; | |
83 | next->tm_mon = now->tm_mon; | |
84 | next->tm_mday = now->tm_mday; | |
85 | next->tm_hour = alrm->tm_hour; | |
86 | next->tm_min = alrm->tm_min; | |
87 | next->tm_sec = alrm->tm_sec; | |
88 | ||
02f3712f AB |
89 | now_time = rtc_tm_to_time64(now); |
90 | next_time = rtc_tm_to_time64(next); | |
2985c29c QZ |
91 | |
92 | if (next_time < now_time) { | |
93 | /* Advance one day */ | |
94 | next_time += 60 * 60 * 24; | |
02f3712f | 95 | rtc_time64_to_tm(next_time, next); |
2985c29c QZ |
96 | } |
97 | } | |
98 | ||
99 | static int pm80x_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
100 | { | |
101 | struct pm80x_rtc_info *info = dev_get_drvdata(dev); | |
102 | unsigned char buf[4]; | |
103 | unsigned long ticks, base, data; | |
104 | regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4); | |
fb0b3225 CIK |
105 | base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
106 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
107 | dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]); |
108 | ||
109 | /* load 32-bit read-only counter */ | |
110 | regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4); | |
fb0b3225 CIK |
111 | data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
112 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
113 | ticks = base + data; |
114 | dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", | |
115 | base, data, ticks); | |
02f3712f | 116 | rtc_time64_to_tm(ticks, tm); |
2985c29c QZ |
117 | return 0; |
118 | } | |
119 | ||
120 | static int pm80x_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
121 | { | |
122 | struct pm80x_rtc_info *info = dev_get_drvdata(dev); | |
123 | unsigned char buf[4]; | |
124 | unsigned long ticks, base, data; | |
39ba6942 | 125 | |
02f3712f | 126 | ticks = rtc_tm_to_time64(tm); |
2985c29c QZ |
127 | |
128 | /* load 32-bit read-only counter */ | |
129 | regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4); | |
fb0b3225 CIK |
130 | data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
131 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
132 | base = ticks - data; |
133 | dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", | |
134 | base, data, ticks); | |
135 | buf[0] = base & 0xFF; | |
136 | buf[1] = (base >> 8) & 0xFF; | |
137 | buf[2] = (base >> 16) & 0xFF; | |
138 | buf[3] = (base >> 24) & 0xFF; | |
139 | regmap_raw_write(info->map, PM800_RTC_EXPIRE2_1, buf, 4); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static int pm80x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
145 | { | |
146 | struct pm80x_rtc_info *info = dev_get_drvdata(dev); | |
147 | unsigned char buf[4]; | |
148 | unsigned long ticks, base, data; | |
149 | int ret; | |
150 | ||
151 | regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4); | |
fb0b3225 CIK |
152 | base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
153 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
154 | dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]); |
155 | ||
156 | regmap_raw_read(info->map, PM800_RTC_EXPIRE1_1, buf, 4); | |
fb0b3225 CIK |
157 | data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
158 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
159 | ticks = base + data; |
160 | dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", | |
161 | base, data, ticks); | |
162 | ||
02f3712f | 163 | rtc_time64_to_tm(ticks, &alrm->time); |
2985c29c QZ |
164 | regmap_read(info->map, PM800_RTC_CONTROL, &ret); |
165 | alrm->enabled = (ret & PM800_ALARM1_EN) ? 1 : 0; | |
166 | alrm->pending = (ret & (PM800_ALARM | PM800_ALARM_WAKEUP)) ? 1 : 0; | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static int pm80x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
171 | { | |
172 | struct pm80x_rtc_info *info = dev_get_drvdata(dev); | |
173 | struct rtc_time now_tm, alarm_tm; | |
174 | unsigned long ticks, base, data; | |
175 | unsigned char buf[4]; | |
176 | int mask; | |
177 | ||
178 | regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0); | |
179 | ||
180 | regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4); | |
fb0b3225 CIK |
181 | base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
182 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
183 | dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]); |
184 | ||
185 | /* load 32-bit read-only counter */ | |
186 | regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4); | |
fb0b3225 CIK |
187 | data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
188 | (buf[1] << 8) | buf[0]; | |
2985c29c QZ |
189 | ticks = base + data; |
190 | dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", | |
191 | base, data, ticks); | |
192 | ||
02f3712f | 193 | rtc_time64_to_tm(ticks, &now_tm); |
2985c29c QZ |
194 | dev_dbg(info->dev, "%s, now time : %lu\n", __func__, ticks); |
195 | rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time); | |
196 | /* get new ticks for alarm in 24 hours */ | |
02f3712f | 197 | ticks = rtc_tm_to_time64(&alarm_tm); |
2985c29c QZ |
198 | dev_dbg(info->dev, "%s, alarm time: %lu\n", __func__, ticks); |
199 | data = ticks - base; | |
200 | ||
201 | buf[0] = data & 0xff; | |
202 | buf[1] = (data >> 8) & 0xff; | |
203 | buf[2] = (data >> 16) & 0xff; | |
204 | buf[3] = (data >> 24) & 0xff; | |
205 | regmap_raw_write(info->map, PM800_RTC_EXPIRE1_1, buf, 4); | |
206 | if (alrm->enabled) { | |
207 | mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN; | |
208 | regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, mask); | |
209 | } else { | |
210 | mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN; | |
211 | regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, | |
212 | PM800_ALARM | PM800_ALARM_WAKEUP); | |
213 | } | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static const struct rtc_class_ops pm80x_rtc_ops = { | |
218 | .read_time = pm80x_rtc_read_time, | |
219 | .set_time = pm80x_rtc_set_time, | |
220 | .read_alarm = pm80x_rtc_read_alarm, | |
221 | .set_alarm = pm80x_rtc_set_alarm, | |
222 | .alarm_irq_enable = pm80x_rtc_alarm_irq_enable, | |
223 | }; | |
224 | ||
569b05a3 | 225 | #ifdef CONFIG_PM_SLEEP |
2985c29c QZ |
226 | static int pm80x_rtc_suspend(struct device *dev) |
227 | { | |
228 | return pm80x_dev_suspend(dev); | |
229 | } | |
230 | ||
231 | static int pm80x_rtc_resume(struct device *dev) | |
232 | { | |
233 | return pm80x_dev_resume(dev); | |
234 | } | |
235 | #endif | |
236 | ||
237 | static SIMPLE_DEV_PM_OPS(pm80x_rtc_pm_ops, pm80x_rtc_suspend, pm80x_rtc_resume); | |
238 | ||
5a167f45 | 239 | static int pm80x_rtc_probe(struct platform_device *pdev) |
2985c29c QZ |
240 | { |
241 | struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
4ab82103 | 242 | struct pm80x_rtc_pdata *pdata = dev_get_platdata(&pdev->dev); |
2985c29c | 243 | struct pm80x_rtc_info *info; |
4ab82103 | 244 | struct device_node *node = pdev->dev.of_node; |
2985c29c QZ |
245 | int ret; |
246 | ||
4ab82103 VH |
247 | if (!pdata && !node) { |
248 | dev_err(&pdev->dev, | |
249 | "pm80x-rtc requires platform data or of_node\n"); | |
250 | return -EINVAL; | |
251 | } | |
252 | ||
253 | if (!pdata) { | |
254 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
255 | if (!pdata) { | |
256 | dev_err(&pdev->dev, "failed to allocate memory\n"); | |
257 | return -ENOMEM; | |
258 | } | |
259 | } | |
2985c29c QZ |
260 | |
261 | info = | |
262 | devm_kzalloc(&pdev->dev, sizeof(struct pm80x_rtc_info), GFP_KERNEL); | |
263 | if (!info) | |
264 | return -ENOMEM; | |
265 | info->irq = platform_get_irq(pdev, 0); | |
266 | if (info->irq < 0) { | |
2985c29c QZ |
267 | ret = -EINVAL; |
268 | goto out; | |
269 | } | |
270 | ||
271 | info->chip = chip; | |
272 | info->map = chip->regmap; | |
273 | if (!info->map) { | |
274 | dev_err(&pdev->dev, "no regmap!\n"); | |
275 | ret = -EINVAL; | |
276 | goto out; | |
277 | } | |
278 | ||
279 | info->dev = &pdev->dev; | |
280 | dev_set_drvdata(&pdev->dev, info); | |
281 | ||
661eb89a AB |
282 | info->rtc_dev = devm_rtc_allocate_device(&pdev->dev); |
283 | if (IS_ERR(info->rtc_dev)) | |
284 | return PTR_ERR(info->rtc_dev); | |
285 | ||
2985c29c QZ |
286 | ret = pm80x_request_irq(chip, info->irq, rtc_update_handler, |
287 | IRQF_ONESHOT, "rtc", info); | |
288 | if (ret < 0) { | |
289 | dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", | |
290 | info->irq, ret); | |
291 | goto out; | |
292 | } | |
293 | ||
661eb89a | 294 | info->rtc_dev->ops = &pm80x_rtc_ops; |
39ba6942 | 295 | info->rtc_dev->range_max = U32_MAX; |
661eb89a AB |
296 | |
297 | ret = rtc_register_device(info->rtc_dev); | |
44c638ce | 298 | if (ret) |
2985c29c | 299 | goto out_rtc; |
44c638ce | 300 | |
2985c29c QZ |
301 | /* |
302 | * enable internal XO instead of internal 3.25MHz clock since it can | |
303 | * free running in PMIC power-down state. | |
304 | */ | |
305 | regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_RTC1_USE_XO, | |
306 | PM800_RTC1_USE_XO); | |
307 | ||
4ab82103 VH |
308 | /* remember whether this power up is caused by PMIC RTC or not */ |
309 | info->rtc_dev->dev.platform_data = &pdata->rtc_wakeup; | |
2985c29c QZ |
310 | |
311 | device_init_wakeup(&pdev->dev, 1); | |
312 | ||
313 | return 0; | |
314 | out_rtc: | |
315 | pm80x_free_irq(chip, info->irq, info); | |
316 | out: | |
2985c29c QZ |
317 | return ret; |
318 | } | |
319 | ||
5a167f45 | 320 | static int pm80x_rtc_remove(struct platform_device *pdev) |
2985c29c QZ |
321 | { |
322 | struct pm80x_rtc_info *info = platform_get_drvdata(pdev); | |
2985c29c | 323 | pm80x_free_irq(info->chip, info->irq, info); |
2985c29c QZ |
324 | return 0; |
325 | } | |
326 | ||
327 | static struct platform_driver pm80x_rtc_driver = { | |
328 | .driver = { | |
329 | .name = "88pm80x-rtc", | |
2985c29c QZ |
330 | .pm = &pm80x_rtc_pm_ops, |
331 | }, | |
332 | .probe = pm80x_rtc_probe, | |
5a167f45 | 333 | .remove = pm80x_rtc_remove, |
2985c29c QZ |
334 | }; |
335 | ||
336 | module_platform_driver(pm80x_rtc_driver); | |
337 | ||
338 | MODULE_LICENSE("GPL"); | |
339 | MODULE_DESCRIPTION("Marvell 88PM80x RTC driver"); | |
340 | MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>"); | |
341 | MODULE_ALIAS("platform:88pm80x-rtc"); |