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0e783980 VB |
1 | /* |
2 | * rtc-tps65910.c -- TPS65910 Real Time Clock interface | |
3 | * | |
4 | * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. | |
5 | * Author: Venu Byravarasu <vbyravarasu@nvidia.com> | |
6 | * | |
7 | * Based on original TI driver rtc-twl.c | |
8 | * Copyright (C) 2007 MontaVista Software, Inc | |
9 | * Author: Alexandre Rusev <source@mvista.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/rtc.h> | |
23 | #include <linux/bcd.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/mfd/tps65910.h> | |
27 | ||
28 | struct tps65910_rtc { | |
29 | struct rtc_device *rtc; | |
eb5eba4e | 30 | int irq; |
0e783980 VB |
31 | }; |
32 | ||
33 | /* Total number of RTC registers needed to set time*/ | |
34 | #define NUM_TIME_REGS (TPS65910_YEARS - TPS65910_SECONDS + 1) | |
35 | ||
36 | static int tps65910_rtc_alarm_irq_enable(struct device *dev, unsigned enabled) | |
37 | { | |
38 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
39 | u8 val = 0; | |
40 | ||
41 | if (enabled) | |
42 | val = TPS65910_RTC_INTERRUPTS_IT_ALARM; | |
43 | ||
44 | return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, val); | |
45 | } | |
46 | ||
47 | /* | |
48 | * Gets current tps65910 RTC time and date parameters. | |
49 | * | |
50 | * The RTC's time/alarm representation is not what gmtime(3) requires | |
51 | * Linux to use: | |
52 | * | |
53 | * - Months are 1..12 vs Linux 0-11 | |
54 | * - Years are 0..99 vs Linux 1900..N (we assume 21st century) | |
55 | */ | |
56 | static int tps65910_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
57 | { | |
58 | unsigned char rtc_data[NUM_TIME_REGS]; | |
59 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
60 | int ret; | |
61 | ||
62 | /* Copy RTC counting registers to static registers or latches */ | |
63 | ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, | |
64 | TPS65910_RTC_CTRL_GET_TIME, TPS65910_RTC_CTRL_GET_TIME); | |
65 | if (ret < 0) { | |
66 | dev_err(dev, "RTC CTRL reg update failed with err:%d\n", ret); | |
67 | return ret; | |
68 | } | |
69 | ||
70 | ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, rtc_data, | |
71 | NUM_TIME_REGS); | |
72 | if (ret < 0) { | |
73 | dev_err(dev, "reading from RTC failed with err:%d\n", ret); | |
74 | return ret; | |
75 | } | |
76 | ||
77 | tm->tm_sec = bcd2bin(rtc_data[0]); | |
78 | tm->tm_min = bcd2bin(rtc_data[1]); | |
79 | tm->tm_hour = bcd2bin(rtc_data[2]); | |
80 | tm->tm_mday = bcd2bin(rtc_data[3]); | |
81 | tm->tm_mon = bcd2bin(rtc_data[4]) - 1; | |
82 | tm->tm_year = bcd2bin(rtc_data[5]) + 100; | |
83 | ||
84 | return ret; | |
85 | } | |
86 | ||
87 | static int tps65910_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
88 | { | |
89 | unsigned char rtc_data[NUM_TIME_REGS]; | |
90 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
91 | int ret; | |
92 | ||
93 | rtc_data[0] = bin2bcd(tm->tm_sec); | |
94 | rtc_data[1] = bin2bcd(tm->tm_min); | |
95 | rtc_data[2] = bin2bcd(tm->tm_hour); | |
96 | rtc_data[3] = bin2bcd(tm->tm_mday); | |
97 | rtc_data[4] = bin2bcd(tm->tm_mon + 1); | |
98 | rtc_data[5] = bin2bcd(tm->tm_year - 100); | |
99 | ||
100 | /* Stop RTC while updating the RTC time registers */ | |
101 | ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, | |
102 | TPS65910_RTC_CTRL_STOP_RTC, 0); | |
103 | if (ret < 0) { | |
104 | dev_err(dev, "RTC stop failed with err:%d\n", ret); | |
105 | return ret; | |
106 | } | |
107 | ||
108 | /* update all the time registers in one shot */ | |
109 | ret = regmap_bulk_write(tps->regmap, TPS65910_SECONDS, rtc_data, | |
110 | NUM_TIME_REGS); | |
111 | if (ret < 0) { | |
112 | dev_err(dev, "rtc_set_time error %d\n", ret); | |
113 | return ret; | |
114 | } | |
115 | ||
116 | /* Start back RTC */ | |
117 | ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, | |
118 | TPS65910_RTC_CTRL_STOP_RTC, 1); | |
119 | if (ret < 0) | |
120 | dev_err(dev, "RTC start failed with err:%d\n", ret); | |
121 | ||
122 | return ret; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Gets current tps65910 RTC alarm time. | |
127 | */ | |
128 | static int tps65910_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
129 | { | |
130 | unsigned char alarm_data[NUM_TIME_REGS]; | |
131 | u32 int_val; | |
132 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
133 | int ret; | |
134 | ||
135 | ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, alarm_data, | |
136 | NUM_TIME_REGS); | |
137 | if (ret < 0) { | |
138 | dev_err(dev, "rtc_read_alarm error %d\n", ret); | |
139 | return ret; | |
140 | } | |
141 | ||
142 | alm->time.tm_sec = bcd2bin(alarm_data[0]); | |
143 | alm->time.tm_min = bcd2bin(alarm_data[1]); | |
144 | alm->time.tm_hour = bcd2bin(alarm_data[2]); | |
145 | alm->time.tm_mday = bcd2bin(alarm_data[3]); | |
146 | alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1; | |
147 | alm->time.tm_year = bcd2bin(alarm_data[5]) + 100; | |
148 | ||
149 | ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, &int_val); | |
150 | if (ret < 0) | |
151 | return ret; | |
152 | ||
153 | if (int_val & TPS65910_RTC_INTERRUPTS_IT_ALARM) | |
154 | alm->enabled = 1; | |
155 | ||
156 | return ret; | |
157 | } | |
158 | ||
159 | static int tps65910_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
160 | { | |
161 | unsigned char alarm_data[NUM_TIME_REGS]; | |
162 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
163 | int ret; | |
164 | ||
165 | ret = tps65910_rtc_alarm_irq_enable(dev, 0); | |
166 | if (ret) | |
167 | return ret; | |
168 | ||
169 | alarm_data[0] = bin2bcd(alm->time.tm_sec); | |
170 | alarm_data[1] = bin2bcd(alm->time.tm_min); | |
171 | alarm_data[2] = bin2bcd(alm->time.tm_hour); | |
172 | alarm_data[3] = bin2bcd(alm->time.tm_mday); | |
173 | alarm_data[4] = bin2bcd(alm->time.tm_mon + 1); | |
174 | alarm_data[5] = bin2bcd(alm->time.tm_year - 100); | |
175 | ||
176 | /* update all the alarm registers in one shot */ | |
177 | ret = regmap_bulk_write(tps->regmap, TPS65910_ALARM_SECONDS, | |
178 | alarm_data, NUM_TIME_REGS); | |
179 | if (ret) { | |
180 | dev_err(dev, "rtc_set_alarm error %d\n", ret); | |
181 | return ret; | |
182 | } | |
183 | ||
184 | if (alm->enabled) | |
185 | ret = tps65910_rtc_alarm_irq_enable(dev, 1); | |
186 | ||
187 | return ret; | |
188 | } | |
189 | ||
190 | static irqreturn_t tps65910_rtc_interrupt(int irq, void *rtc) | |
191 | { | |
192 | struct device *dev = rtc; | |
193 | unsigned long events = 0; | |
194 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
195 | struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev); | |
196 | int ret; | |
197 | u32 rtc_reg; | |
198 | ||
199 | ret = regmap_read(tps->regmap, TPS65910_RTC_STATUS, &rtc_reg); | |
200 | if (ret) | |
201 | return IRQ_NONE; | |
202 | ||
203 | if (rtc_reg & TPS65910_RTC_STATUS_ALARM) | |
204 | events = RTC_IRQF | RTC_AF; | |
205 | ||
206 | ret = regmap_write(tps->regmap, TPS65910_RTC_STATUS, rtc_reg); | |
207 | if (ret) | |
208 | return IRQ_NONE; | |
209 | ||
210 | /* Notify RTC core on event */ | |
211 | rtc_update_irq(tps_rtc->rtc, 1, events); | |
212 | ||
213 | return IRQ_HANDLED; | |
214 | } | |
215 | ||
216 | static const struct rtc_class_ops tps65910_rtc_ops = { | |
217 | .read_time = tps65910_rtc_read_time, | |
218 | .set_time = tps65910_rtc_set_time, | |
219 | .read_alarm = tps65910_rtc_read_alarm, | |
220 | .set_alarm = tps65910_rtc_set_alarm, | |
221 | .alarm_irq_enable = tps65910_rtc_alarm_irq_enable, | |
222 | }; | |
223 | ||
5a167f45 | 224 | static int tps65910_rtc_probe(struct platform_device *pdev) |
0e783980 VB |
225 | { |
226 | struct tps65910 *tps65910 = NULL; | |
227 | struct tps65910_rtc *tps_rtc = NULL; | |
0e783980 VB |
228 | int ret; |
229 | int irq; | |
230 | u32 rtc_reg; | |
231 | ||
232 | tps65910 = dev_get_drvdata(pdev->dev.parent); | |
233 | ||
234 | tps_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps65910_rtc), | |
235 | GFP_KERNEL); | |
236 | if (!tps_rtc) | |
237 | return -ENOMEM; | |
238 | ||
239 | /* Clear pending interrupts */ | |
240 | ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg); | |
241 | if (ret < 0) | |
242 | return ret; | |
243 | ||
244 | ret = regmap_write(tps65910->regmap, TPS65910_RTC_STATUS, rtc_reg); | |
245 | if (ret < 0) | |
246 | return ret; | |
247 | ||
248 | dev_dbg(&pdev->dev, "Enabling rtc-tps65910.\n"); | |
18c701a9 KM |
249 | |
250 | /* Enable RTC digital power domain */ | |
251 | ret = regmap_update_bits(tps65910->regmap, TPS65910_DEVCTRL, | |
252 | DEVCTRL_RTC_PWDN_MASK, 0 << DEVCTRL_RTC_PWDN_SHIFT); | |
253 | if (ret < 0) | |
254 | return ret; | |
255 | ||
0e783980 VB |
256 | rtc_reg = TPS65910_RTC_CTRL_STOP_RTC; |
257 | ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg); | |
258 | if (ret < 0) | |
259 | return ret; | |
260 | ||
9f7d7a1d TR |
261 | platform_set_drvdata(pdev, tps_rtc); |
262 | ||
06f77d18 | 263 | irq = platform_get_irq(pdev, 0); |
0e783980 VB |
264 | if (irq <= 0) { |
265 | dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n", | |
266 | irq); | |
dbda161b | 267 | return -ENXIO; |
0e783980 VB |
268 | } |
269 | ||
0e783980 | 270 | ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, |
225ccc28 | 271 | tps65910_rtc_interrupt, IRQF_TRIGGER_LOW | IRQF_EARLY_RESUME, |
32c4746c | 272 | dev_name(&pdev->dev), &pdev->dev); |
0e783980 VB |
273 | if (ret < 0) { |
274 | dev_err(&pdev->dev, "IRQ is not free.\n"); | |
275 | return ret; | |
276 | } | |
eb5eba4e LD |
277 | tps_rtc->irq = irq; |
278 | device_set_wakeup_capable(&pdev->dev, 1); | |
0e783980 | 279 | |
97868b32 | 280 | tps_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
0e783980 VB |
281 | &tps65910_rtc_ops, THIS_MODULE); |
282 | if (IS_ERR(tps_rtc->rtc)) { | |
283 | ret = PTR_ERR(tps_rtc->rtc); | |
284 | dev_err(&pdev->dev, "RTC device register: err %d\n", ret); | |
285 | return ret; | |
286 | } | |
287 | ||
0e783980 VB |
288 | return 0; |
289 | } | |
290 | ||
291 | /* | |
292 | * Disable tps65910 RTC interrupts. | |
293 | * Sets status flag to free. | |
294 | */ | |
5a167f45 | 295 | static int tps65910_rtc_remove(struct platform_device *pdev) |
0e783980 | 296 | { |
1430e178 | 297 | tps65910_rtc_alarm_irq_enable(&pdev->dev, 0); |
0e783980 | 298 | |
0e783980 VB |
299 | return 0; |
300 | } | |
301 | ||
302 | #ifdef CONFIG_PM_SLEEP | |
0e783980 VB |
303 | static int tps65910_rtc_suspend(struct device *dev) |
304 | { | |
eb5eba4e | 305 | struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev); |
0e783980 | 306 | |
eb5eba4e LD |
307 | if (device_may_wakeup(dev)) |
308 | enable_irq_wake(tps_rtc->irq); | |
dfaf09ac | 309 | return 0; |
0e783980 VB |
310 | } |
311 | ||
312 | static int tps65910_rtc_resume(struct device *dev) | |
313 | { | |
eb5eba4e LD |
314 | struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev); |
315 | ||
316 | if (device_may_wakeup(dev)) | |
317 | disable_irq_wake(tps_rtc->irq); | |
dfaf09ac | 318 | return 0; |
0e783980 | 319 | } |
176a9f20 | 320 | #endif |
0e783980 | 321 | |
e4ae909b JH |
322 | static SIMPLE_DEV_PM_OPS(tps65910_rtc_pm_ops, tps65910_rtc_suspend, |
323 | tps65910_rtc_resume); | |
0e783980 | 324 | |
0e783980 VB |
325 | static struct platform_driver tps65910_rtc_driver = { |
326 | .probe = tps65910_rtc_probe, | |
5a167f45 | 327 | .remove = tps65910_rtc_remove, |
0e783980 VB |
328 | .driver = { |
329 | .owner = THIS_MODULE, | |
330 | .name = "tps65910-rtc", | |
176a9f20 | 331 | .pm = &tps65910_rtc_pm_ops, |
0e783980 VB |
332 | }, |
333 | }; | |
334 | ||
335 | module_platform_driver(tps65910_rtc_driver); | |
336 | MODULE_ALIAS("platform:rtc-tps65910"); | |
337 | MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>"); | |
338 | MODULE_LICENSE("GPL"); |