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0101e53c LD |
1 | /* |
2 | * rtc-palmas.c -- Palmas Real Time Clock driver. | |
3 | ||
4 | * RTC driver for TI Palma series devices like TPS65913, | |
5 | * TPS65914 power management IC. | |
6 | * | |
7 | * Copyright (c) 2012, NVIDIA Corporation. | |
8 | * | |
9 | * Author: Laxman Dewangan <ldewangan@nvidia.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 as | |
13 | * published by the Free Software Foundation version 2. | |
14 | * | |
15 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, | |
16 | * whether express or implied; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
23 | * 02111-1307, USA | |
24 | */ | |
25 | ||
26 | #include <linux/bcd.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/mfd/palmas.h> | |
32 | #include <linux/module.h> | |
0288d2e3 | 33 | #include <linux/of.h> |
0101e53c LD |
34 | #include <linux/rtc.h> |
35 | #include <linux/types.h> | |
36 | #include <linux/platform_device.h> | |
37 | #include <linux/pm.h> | |
38 | ||
39 | struct palmas_rtc { | |
40 | struct rtc_device *rtc; | |
41 | struct device *dev; | |
42 | unsigned int irq; | |
43 | }; | |
44 | ||
45 | /* Total number of RTC registers needed to set time*/ | |
46 | #define PALMAS_NUM_TIME_REGS (PALMAS_YEARS_REG - PALMAS_SECONDS_REG + 1) | |
47 | ||
48 | static int palmas_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
49 | { | |
50 | unsigned char rtc_data[PALMAS_NUM_TIME_REGS]; | |
51 | struct palmas *palmas = dev_get_drvdata(dev->parent); | |
52 | int ret; | |
53 | ||
54 | /* Copy RTC counting registers to static registers or latches */ | |
55 | ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG, | |
56 | PALMAS_RTC_CTRL_REG_GET_TIME, PALMAS_RTC_CTRL_REG_GET_TIME); | |
57 | if (ret < 0) { | |
58 | dev_err(dev, "RTC CTRL reg update failed, err: %d\n", ret); | |
59 | return ret; | |
60 | } | |
61 | ||
62 | ret = palmas_bulk_read(palmas, PALMAS_RTC_BASE, PALMAS_SECONDS_REG, | |
63 | rtc_data, PALMAS_NUM_TIME_REGS); | |
64 | if (ret < 0) { | |
65 | dev_err(dev, "RTC_SECONDS reg read failed, err = %d\n", ret); | |
66 | return ret; | |
67 | } | |
68 | ||
69 | tm->tm_sec = bcd2bin(rtc_data[0]); | |
70 | tm->tm_min = bcd2bin(rtc_data[1]); | |
71 | tm->tm_hour = bcd2bin(rtc_data[2]); | |
72 | tm->tm_mday = bcd2bin(rtc_data[3]); | |
73 | tm->tm_mon = bcd2bin(rtc_data[4]) - 1; | |
74 | tm->tm_year = bcd2bin(rtc_data[5]) + 100; | |
75 | ||
76 | return ret; | |
77 | } | |
78 | ||
79 | static int palmas_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
80 | { | |
81 | unsigned char rtc_data[PALMAS_NUM_TIME_REGS]; | |
82 | struct palmas *palmas = dev_get_drvdata(dev->parent); | |
83 | int ret; | |
84 | ||
85 | rtc_data[0] = bin2bcd(tm->tm_sec); | |
86 | rtc_data[1] = bin2bcd(tm->tm_min); | |
87 | rtc_data[2] = bin2bcd(tm->tm_hour); | |
88 | rtc_data[3] = bin2bcd(tm->tm_mday); | |
89 | rtc_data[4] = bin2bcd(tm->tm_mon + 1); | |
90 | rtc_data[5] = bin2bcd(tm->tm_year - 100); | |
91 | ||
92 | /* Stop RTC while updating the RTC time registers */ | |
93 | ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG, | |
94 | PALMAS_RTC_CTRL_REG_STOP_RTC, 0); | |
95 | if (ret < 0) { | |
96 | dev_err(dev, "RTC stop failed, err = %d\n", ret); | |
97 | return ret; | |
98 | } | |
99 | ||
100 | ret = palmas_bulk_write(palmas, PALMAS_RTC_BASE, PALMAS_SECONDS_REG, | |
101 | rtc_data, PALMAS_NUM_TIME_REGS); | |
102 | if (ret < 0) { | |
103 | dev_err(dev, "RTC_SECONDS reg write failed, err = %d\n", ret); | |
104 | return ret; | |
105 | } | |
106 | ||
107 | /* Start back RTC */ | |
108 | ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG, | |
109 | PALMAS_RTC_CTRL_REG_STOP_RTC, PALMAS_RTC_CTRL_REG_STOP_RTC); | |
110 | if (ret < 0) | |
111 | dev_err(dev, "RTC start failed, err = %d\n", ret); | |
112 | return ret; | |
113 | } | |
114 | ||
115 | static int palmas_rtc_alarm_irq_enable(struct device *dev, unsigned enabled) | |
116 | { | |
117 | struct palmas *palmas = dev_get_drvdata(dev->parent); | |
118 | u8 val; | |
119 | ||
120 | val = enabled ? PALMAS_RTC_INTERRUPTS_REG_IT_ALARM : 0; | |
121 | return palmas_write(palmas, PALMAS_RTC_BASE, | |
122 | PALMAS_RTC_INTERRUPTS_REG, val); | |
123 | } | |
124 | ||
125 | static int palmas_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
126 | { | |
127 | unsigned char alarm_data[PALMAS_NUM_TIME_REGS]; | |
128 | u32 int_val; | |
129 | struct palmas *palmas = dev_get_drvdata(dev->parent); | |
130 | int ret; | |
131 | ||
132 | ret = palmas_bulk_read(palmas, PALMAS_RTC_BASE, | |
133 | PALMAS_ALARM_SECONDS_REG, | |
134 | alarm_data, PALMAS_NUM_TIME_REGS); | |
135 | if (ret < 0) { | |
136 | dev_err(dev, "RTC_ALARM_SECONDS read failed, err = %d\n", ret); | |
137 | return ret; | |
138 | } | |
139 | ||
140 | alm->time.tm_sec = bcd2bin(alarm_data[0]); | |
141 | alm->time.tm_min = bcd2bin(alarm_data[1]); | |
142 | alm->time.tm_hour = bcd2bin(alarm_data[2]); | |
143 | alm->time.tm_mday = bcd2bin(alarm_data[3]); | |
144 | alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1; | |
145 | alm->time.tm_year = bcd2bin(alarm_data[5]) + 100; | |
146 | ||
147 | ret = palmas_read(palmas, PALMAS_RTC_BASE, PALMAS_RTC_INTERRUPTS_REG, | |
148 | &int_val); | |
149 | if (ret < 0) { | |
150 | dev_err(dev, "RTC_INTERRUPTS reg read failed, err = %d\n", ret); | |
151 | return ret; | |
152 | } | |
153 | ||
154 | if (int_val & PALMAS_RTC_INTERRUPTS_REG_IT_ALARM) | |
155 | alm->enabled = 1; | |
156 | return ret; | |
157 | } | |
158 | ||
159 | static int palmas_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
160 | { | |
161 | unsigned char alarm_data[PALMAS_NUM_TIME_REGS]; | |
162 | struct palmas *palmas = dev_get_drvdata(dev->parent); | |
163 | int ret; | |
164 | ||
165 | ret = palmas_rtc_alarm_irq_enable(dev, 0); | |
166 | if (ret < 0) { | |
167 | dev_err(dev, "Disable RTC alarm failed\n"); | |
168 | return ret; | |
169 | } | |
170 | ||
171 | alarm_data[0] = bin2bcd(alm->time.tm_sec); | |
172 | alarm_data[1] = bin2bcd(alm->time.tm_min); | |
173 | alarm_data[2] = bin2bcd(alm->time.tm_hour); | |
174 | alarm_data[3] = bin2bcd(alm->time.tm_mday); | |
175 | alarm_data[4] = bin2bcd(alm->time.tm_mon + 1); | |
176 | alarm_data[5] = bin2bcd(alm->time.tm_year - 100); | |
177 | ||
178 | ret = palmas_bulk_write(palmas, PALMAS_RTC_BASE, | |
179 | PALMAS_ALARM_SECONDS_REG, alarm_data, PALMAS_NUM_TIME_REGS); | |
180 | if (ret < 0) { | |
181 | dev_err(dev, "ALARM_SECONDS_REG write failed, err = %d\n", ret); | |
182 | return ret; | |
183 | } | |
184 | ||
185 | if (alm->enabled) | |
186 | ret = palmas_rtc_alarm_irq_enable(dev, 1); | |
187 | return ret; | |
188 | } | |
189 | ||
190 | static int palmas_clear_interrupts(struct device *dev) | |
191 | { | |
192 | struct palmas *palmas = dev_get_drvdata(dev->parent); | |
193 | unsigned int rtc_reg; | |
194 | int ret; | |
195 | ||
196 | ret = palmas_read(palmas, PALMAS_RTC_BASE, PALMAS_RTC_STATUS_REG, | |
197 | &rtc_reg); | |
198 | if (ret < 0) { | |
199 | dev_err(dev, "RTC_STATUS read failed, err = %d\n", ret); | |
200 | return ret; | |
201 | } | |
202 | ||
203 | ret = palmas_write(palmas, PALMAS_RTC_BASE, PALMAS_RTC_STATUS_REG, | |
204 | rtc_reg); | |
205 | if (ret < 0) { | |
206 | dev_err(dev, "RTC_STATUS write failed, err = %d\n", ret); | |
207 | return ret; | |
208 | } | |
209 | return 0; | |
210 | } | |
211 | ||
212 | static irqreturn_t palmas_rtc_interrupt(int irq, void *context) | |
213 | { | |
214 | struct palmas_rtc *palmas_rtc = context; | |
215 | struct device *dev = palmas_rtc->dev; | |
216 | int ret; | |
217 | ||
218 | ret = palmas_clear_interrupts(dev); | |
219 | if (ret < 0) { | |
220 | dev_err(dev, "RTC interrupt clear failed, err = %d\n", ret); | |
221 | return IRQ_NONE; | |
222 | } | |
223 | ||
224 | rtc_update_irq(palmas_rtc->rtc, 1, RTC_IRQF | RTC_AF); | |
225 | return IRQ_HANDLED; | |
226 | } | |
227 | ||
228 | static struct rtc_class_ops palmas_rtc_ops = { | |
229 | .read_time = palmas_rtc_read_time, | |
230 | .set_time = palmas_rtc_set_time, | |
231 | .read_alarm = palmas_rtc_read_alarm, | |
232 | .set_alarm = palmas_rtc_set_alarm, | |
233 | .alarm_irq_enable = palmas_rtc_alarm_irq_enable, | |
234 | }; | |
235 | ||
236 | static int palmas_rtc_probe(struct platform_device *pdev) | |
237 | { | |
238 | struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); | |
239 | struct palmas_rtc *palmas_rtc = NULL; | |
240 | int ret; | |
666a584d | 241 | bool enable_bb_charging = false; |
d200c79b | 242 | bool high_bb_charging = false; |
666a584d LD |
243 | |
244 | if (pdev->dev.of_node) { | |
245 | enable_bb_charging = of_property_read_bool(pdev->dev.of_node, | |
246 | "ti,backup-battery-chargeable"); | |
247 | high_bb_charging = of_property_read_bool(pdev->dev.of_node, | |
248 | "ti,backup-battery-charge-high-current"); | |
249 | } | |
0101e53c LD |
250 | |
251 | palmas_rtc = devm_kzalloc(&pdev->dev, sizeof(struct palmas_rtc), | |
252 | GFP_KERNEL); | |
253 | if (!palmas_rtc) | |
254 | return -ENOMEM; | |
255 | ||
256 | /* Clear pending interrupts */ | |
257 | ret = palmas_clear_interrupts(&pdev->dev); | |
258 | if (ret < 0) { | |
259 | dev_err(&pdev->dev, "clear RTC int failed, err = %d\n", ret); | |
260 | return ret; | |
261 | } | |
262 | ||
263 | palmas_rtc->dev = &pdev->dev; | |
264 | platform_set_drvdata(pdev, palmas_rtc); | |
265 | ||
666a584d LD |
266 | if (enable_bb_charging) { |
267 | unsigned reg = PALMAS_BACKUP_BATTERY_CTRL_BBS_BBC_LOW_ICHRG; | |
268 | ||
269 | if (high_bb_charging) | |
270 | reg = 0; | |
271 | ||
272 | ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE, | |
273 | PALMAS_BACKUP_BATTERY_CTRL, | |
274 | PALMAS_BACKUP_BATTERY_CTRL_BBS_BBC_LOW_ICHRG, reg); | |
275 | if (ret < 0) { | |
276 | dev_err(&pdev->dev, | |
277 | "BACKUP_BATTERY_CTRL update failed, %d\n", ret); | |
278 | return ret; | |
279 | } | |
280 | ||
281 | ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE, | |
282 | PALMAS_BACKUP_BATTERY_CTRL, | |
283 | PALMAS_BACKUP_BATTERY_CTRL_BB_CHG_EN, | |
284 | PALMAS_BACKUP_BATTERY_CTRL_BB_CHG_EN); | |
285 | if (ret < 0) { | |
286 | dev_err(&pdev->dev, | |
287 | "BACKUP_BATTERY_CTRL update failed, %d\n", ret); | |
288 | return ret; | |
289 | } | |
290 | } | |
291 | ||
0101e53c LD |
292 | /* Start RTC */ |
293 | ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG, | |
294 | PALMAS_RTC_CTRL_REG_STOP_RTC, | |
295 | PALMAS_RTC_CTRL_REG_STOP_RTC); | |
296 | if (ret < 0) { | |
297 | dev_err(&pdev->dev, "RTC_CTRL write failed, err = %d\n", ret); | |
298 | return ret; | |
299 | } | |
300 | ||
301 | palmas_rtc->irq = platform_get_irq(pdev, 0); | |
302 | ||
2c5a5b30 | 303 | device_init_wakeup(&pdev->dev, 1); |
27971335 | 304 | palmas_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
0101e53c LD |
305 | &palmas_rtc_ops, THIS_MODULE); |
306 | if (IS_ERR(palmas_rtc->rtc)) { | |
307 | ret = PTR_ERR(palmas_rtc->rtc); | |
308 | dev_err(&pdev->dev, "RTC register failed, err = %d\n", ret); | |
309 | return ret; | |
310 | } | |
311 | ||
27971335 | 312 | ret = devm_request_threaded_irq(&pdev->dev, palmas_rtc->irq, NULL, |
0101e53c LD |
313 | palmas_rtc_interrupt, |
314 | IRQF_TRIGGER_LOW | IRQF_ONESHOT | | |
315 | IRQF_EARLY_RESUME, | |
316 | dev_name(&pdev->dev), palmas_rtc); | |
317 | if (ret < 0) { | |
318 | dev_err(&pdev->dev, "IRQ request failed, err = %d\n", ret); | |
0101e53c LD |
319 | return ret; |
320 | } | |
321 | ||
0101e53c LD |
322 | return 0; |
323 | } | |
324 | ||
325 | static int palmas_rtc_remove(struct platform_device *pdev) | |
326 | { | |
0101e53c | 327 | palmas_rtc_alarm_irq_enable(&pdev->dev, 0); |
0101e53c LD |
328 | return 0; |
329 | } | |
330 | ||
331 | #ifdef CONFIG_PM_SLEEP | |
332 | static int palmas_rtc_suspend(struct device *dev) | |
333 | { | |
334 | struct palmas_rtc *palmas_rtc = dev_get_drvdata(dev); | |
335 | ||
336 | if (device_may_wakeup(dev)) | |
337 | enable_irq_wake(palmas_rtc->irq); | |
338 | return 0; | |
339 | } | |
340 | ||
341 | static int palmas_rtc_resume(struct device *dev) | |
342 | { | |
343 | struct palmas_rtc *palmas_rtc = dev_get_drvdata(dev); | |
344 | ||
345 | if (device_may_wakeup(dev)) | |
346 | disable_irq_wake(palmas_rtc->irq); | |
347 | return 0; | |
348 | } | |
349 | #endif | |
350 | ||
3f93822d JH |
351 | static SIMPLE_DEV_PM_OPS(palmas_rtc_pm_ops, palmas_rtc_suspend, |
352 | palmas_rtc_resume); | |
0101e53c | 353 | |
0288d2e3 | 354 | #ifdef CONFIG_OF |
7abe3f54 | 355 | static const struct of_device_id of_palmas_rtc_match[] = { |
0288d2e3 LD |
356 | { .compatible = "ti,palmas-rtc"}, |
357 | { }, | |
358 | }; | |
359 | MODULE_DEVICE_TABLE(of, of_palmas_rtc_match); | |
360 | #endif | |
361 | ||
0101e53c LD |
362 | static struct platform_driver palmas_rtc_driver = { |
363 | .probe = palmas_rtc_probe, | |
364 | .remove = palmas_rtc_remove, | |
365 | .driver = { | |
0101e53c LD |
366 | .name = "palmas-rtc", |
367 | .pm = &palmas_rtc_pm_ops, | |
0288d2e3 | 368 | .of_match_table = of_match_ptr(of_palmas_rtc_match), |
0101e53c LD |
369 | }, |
370 | }; | |
371 | ||
372 | module_platform_driver(palmas_rtc_driver); | |
373 | ||
374 | MODULE_ALIAS("platform:palmas_rtc"); | |
375 | MODULE_DESCRIPTION("TI PALMAS series RTC driver"); | |
376 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
377 | MODULE_LICENSE("GPL v2"); |