staging: rtl8188eu: rename HalSetBrateCfg() - style
[linux/fpc-iii.git] / drivers / rtc / rtc-88pm80x.c
blobcab293cb2bf0b335bdd07940f713965720f00830
1 /*
2 * Real Time Clock driver for Marvell 88PM80x PMIC
4 * Copyright (c) 2012 Marvell International Ltd.
5 * Wenzeng Chen<wzch@marvell.com>
6 * Qiao Zhou <zhouqiao@marvell.com>
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.
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.
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
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>
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)
47 #define PM800_POWER_DOWN_LOG1 (0xE5)
48 #define PM800_POWER_DOWN_LOG2 (0xE6)
50 struct pm80x_rtc_info {
51 struct pm80x_chip *chip;
52 struct regmap *map;
53 struct rtc_device *rtc_dev;
54 struct device *dev;
56 int irq;
59 static irqreturn_t rtc_update_handler(int irq, void *data)
61 struct pm80x_rtc_info *info = (struct pm80x_rtc_info *)data;
62 int mask;
64 mask = PM800_ALARM | PM800_ALARM_WAKEUP;
65 regmap_update_bits(info->map, PM800_RTC_CONTROL, mask | PM800_ALARM1_EN,
66 mask);
67 rtc_update_irq(info->rtc_dev, 1, RTC_AF);
68 return IRQ_HANDLED;
71 static int pm80x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
73 struct pm80x_rtc_info *info = dev_get_drvdata(dev);
75 if (enabled)
76 regmap_update_bits(info->map, PM800_RTC_CONTROL,
77 PM800_ALARM1_EN, PM800_ALARM1_EN);
78 else
79 regmap_update_bits(info->map, PM800_RTC_CONTROL,
80 PM800_ALARM1_EN, 0);
81 return 0;
85 * Calculate the next alarm time given the requested alarm time mask
86 * and the current time.
88 static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now,
89 struct rtc_time *alrm)
91 unsigned long next_time;
92 unsigned long now_time;
94 next->tm_year = now->tm_year;
95 next->tm_mon = now->tm_mon;
96 next->tm_mday = now->tm_mday;
97 next->tm_hour = alrm->tm_hour;
98 next->tm_min = alrm->tm_min;
99 next->tm_sec = alrm->tm_sec;
101 now_time = rtc_tm_to_time64(now);
102 next_time = rtc_tm_to_time64(next);
104 if (next_time < now_time) {
105 /* Advance one day */
106 next_time += 60 * 60 * 24;
107 rtc_time64_to_tm(next_time, next);
111 static int pm80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
113 struct pm80x_rtc_info *info = dev_get_drvdata(dev);
114 unsigned char buf[4];
115 unsigned long ticks, base, data;
116 regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
117 base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
118 dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
120 /* load 32-bit read-only counter */
121 regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
122 data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
123 ticks = base + data;
124 dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
125 base, data, ticks);
126 rtc_time64_to_tm(ticks, tm);
127 return 0;
130 static int pm80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
132 struct pm80x_rtc_info *info = dev_get_drvdata(dev);
133 unsigned char buf[4];
134 unsigned long ticks, base, data;
136 ticks = rtc_tm_to_time64(tm);
138 /* load 32-bit read-only counter */
139 regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
140 data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
141 base = ticks - data;
142 dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
143 base, data, ticks);
144 buf[0] = base & 0xFF;
145 buf[1] = (base >> 8) & 0xFF;
146 buf[2] = (base >> 16) & 0xFF;
147 buf[3] = (base >> 24) & 0xFF;
148 regmap_raw_write(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
150 return 0;
153 static int pm80x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
155 struct pm80x_rtc_info *info = dev_get_drvdata(dev);
156 unsigned char buf[4];
157 unsigned long ticks, base, data;
158 int ret;
160 regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
161 base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
162 dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
164 regmap_raw_read(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
165 data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
166 ticks = base + data;
167 dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
168 base, data, ticks);
170 rtc_time64_to_tm(ticks, &alrm->time);
171 regmap_read(info->map, PM800_RTC_CONTROL, &ret);
172 alrm->enabled = (ret & PM800_ALARM1_EN) ? 1 : 0;
173 alrm->pending = (ret & (PM800_ALARM | PM800_ALARM_WAKEUP)) ? 1 : 0;
174 return 0;
177 static int pm80x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
179 struct pm80x_rtc_info *info = dev_get_drvdata(dev);
180 struct rtc_time now_tm, alarm_tm;
181 unsigned long ticks, base, data;
182 unsigned char buf[4];
183 int mask;
185 regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0);
187 regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
188 base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
189 dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
191 /* load 32-bit read-only counter */
192 regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
193 data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
194 ticks = base + data;
195 dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
196 base, data, ticks);
198 rtc_time64_to_tm(ticks, &now_tm);
199 dev_dbg(info->dev, "%s, now time : %lu\n", __func__, ticks);
200 rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time);
201 /* get new ticks for alarm in 24 hours */
202 ticks = rtc_tm_to_time64(&alarm_tm);
203 dev_dbg(info->dev, "%s, alarm time: %lu\n", __func__, ticks);
204 data = ticks - base;
206 buf[0] = data & 0xff;
207 buf[1] = (data >> 8) & 0xff;
208 buf[2] = (data >> 16) & 0xff;
209 buf[3] = (data >> 24) & 0xff;
210 regmap_raw_write(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
211 if (alrm->enabled) {
212 mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN;
213 regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, mask);
214 } else {
215 mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN;
216 regmap_update_bits(info->map, PM800_RTC_CONTROL, mask,
217 PM800_ALARM | PM800_ALARM_WAKEUP);
219 return 0;
222 static const struct rtc_class_ops pm80x_rtc_ops = {
223 .read_time = pm80x_rtc_read_time,
224 .set_time = pm80x_rtc_set_time,
225 .read_alarm = pm80x_rtc_read_alarm,
226 .set_alarm = pm80x_rtc_set_alarm,
227 .alarm_irq_enable = pm80x_rtc_alarm_irq_enable,
230 #ifdef CONFIG_PM_SLEEP
231 static int pm80x_rtc_suspend(struct device *dev)
233 return pm80x_dev_suspend(dev);
236 static int pm80x_rtc_resume(struct device *dev)
238 return pm80x_dev_resume(dev);
240 #endif
242 static SIMPLE_DEV_PM_OPS(pm80x_rtc_pm_ops, pm80x_rtc_suspend, pm80x_rtc_resume);
244 static int pm80x_rtc_probe(struct platform_device *pdev)
246 struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
247 struct pm80x_rtc_pdata *pdata = dev_get_platdata(&pdev->dev);
248 struct pm80x_rtc_info *info;
249 struct device_node *node = pdev->dev.of_node;
250 int ret;
252 if (!pdata && !node) {
253 dev_err(&pdev->dev,
254 "pm80x-rtc requires platform data or of_node\n");
255 return -EINVAL;
258 if (!pdata) {
259 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
260 if (!pdata) {
261 dev_err(&pdev->dev, "failed to allocate memory\n");
262 return -ENOMEM;
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;
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;
285 info->dev = &pdev->dev;
286 dev_set_drvdata(&pdev->dev, info);
288 info->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
289 if (IS_ERR(info->rtc_dev))
290 return PTR_ERR(info->rtc_dev);
292 ret = pm80x_request_irq(chip, info->irq, rtc_update_handler,
293 IRQF_ONESHOT, "rtc", info);
294 if (ret < 0) {
295 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
296 info->irq, ret);
297 goto out;
300 info->rtc_dev->ops = &pm80x_rtc_ops;
301 info->rtc_dev->range_max = U32_MAX;
303 ret = rtc_register_device(info->rtc_dev);
304 if (ret) {
305 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
306 goto out_rtc;
309 * enable internal XO instead of internal 3.25MHz clock since it can
310 * free running in PMIC power-down state.
312 regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_RTC1_USE_XO,
313 PM800_RTC1_USE_XO);
315 /* remember whether this power up is caused by PMIC RTC or not */
316 info->rtc_dev->dev.platform_data = &pdata->rtc_wakeup;
318 device_init_wakeup(&pdev->dev, 1);
320 return 0;
321 out_rtc:
322 pm80x_free_irq(chip, info->irq, info);
323 out:
324 return ret;
327 static int pm80x_rtc_remove(struct platform_device *pdev)
329 struct pm80x_rtc_info *info = platform_get_drvdata(pdev);
330 pm80x_free_irq(info->chip, info->irq, info);
331 return 0;
334 static struct platform_driver pm80x_rtc_driver = {
335 .driver = {
336 .name = "88pm80x-rtc",
337 .pm = &pm80x_rtc_pm_ops,
339 .probe = pm80x_rtc_probe,
340 .remove = pm80x_rtc_remove,
343 module_platform_driver(pm80x_rtc_driver);
345 MODULE_LICENSE("GPL");
346 MODULE_DESCRIPTION("Marvell 88PM80x RTC driver");
347 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
348 MODULE_ALIAS("platform:88pm80x-rtc");