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9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/of.h>
12#include <linux/platform_device.h>
13#include <linux/slab.h>
14#include <linux/mutex.h>
15#include <linux/rtc.h>
16#include <linux/delay.h>
17#include <linux/mfd/core.h>
18#include <linux/mfd/88pm860x.h>
19
20#define VRTC_CALIBRATION
21
22struct pm860x_rtc_info {
23 struct pm860x_chip *chip;
24 struct i2c_client *i2c;
25 struct rtc_device *rtc_dev;
26 struct device *dev;
27 struct delayed_work calib_work;
28
29 int irq;
30 int vrtc;
31};
32
33#define REG_VRTC_MEAS1 0x7D
34
35#define REG0_ADDR 0xB0
36#define REG1_ADDR 0xB2
37#define REG2_ADDR 0xB4
38#define REG3_ADDR 0xB6
39
40#define REG0_DATA 0xB1
41#define REG1_DATA 0xB3
42#define REG2_DATA 0xB5
43#define REG3_DATA 0xB7
44
45
46#define MEAS2_VRTC (1 << 0)
47
48
49#define ALARM_EN (1 << 3)
50#define ALARM_WAKEUP (1 << 4)
51#define ALARM (1 << 5)
52#define RTC1_USE_XO (1 << 7)
53
54#define VRTC_CALIB_INTERVAL (HZ * 60 * 10)
55
56static irqreturn_t rtc_update_handler(int irq, void *data)
57{
58 struct pm860x_rtc_info *info = (struct pm860x_rtc_info *)data;
59 int mask;
60
61 mask = ALARM | ALARM_WAKEUP;
62 pm860x_set_bits(info->i2c, PM8607_RTC1, mask | ALARM_EN, mask);
63 rtc_update_irq(info->rtc_dev, 1, RTC_AF);
64 return IRQ_HANDLED;
65}
66
67static int pm860x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
68{
69 struct pm860x_rtc_info *info = dev_get_drvdata(dev);
70
71 if (enabled)
72 pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, ALARM_EN);
73 else
74 pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0);
75 return 0;
76}
77
78static int pm860x_rtc_read_time(struct device *dev, struct rtc_time *tm)
79{
80 struct pm860x_rtc_info *info = dev_get_drvdata(dev);
81 unsigned char buf[8];
82 unsigned long ticks, base, data;
83
84 pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
85 dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
86 buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
87 base = ((unsigned long)buf[1] << 24) | (buf[3] << 16) |
88 (buf[5] << 8) | buf[7];
89
90
91 pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
92 data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
93 (buf[1] << 8) | buf[0];
94 ticks = base + data;
95 dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
96 base, data, ticks);
97
98 rtc_time64_to_tm(ticks, tm);
99
100 return 0;
101}
102
103static int pm860x_rtc_set_time(struct device *dev, struct rtc_time *tm)
104{
105 struct pm860x_rtc_info *info = dev_get_drvdata(dev);
106 unsigned char buf[4];
107 unsigned long ticks, base, data;
108
109 if (tm->tm_year > 206) {
110 dev_dbg(info->dev, "Set time %d out of range. "
111 "Please set time between 1970 to 2106.\n",
112 1900 + tm->tm_year);
113 return -EINVAL;
114 }
115 ticks = rtc_tm_to_time64(tm);
116
117
118 pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
119 data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
120 (buf[1] << 8) | buf[0];
121 base = ticks - data;
122 dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
123 base, data, ticks);
124
125 pm860x_page_reg_write(info->i2c, REG0_DATA, (base >> 24) & 0xFF);
126 pm860x_page_reg_write(info->i2c, REG1_DATA, (base >> 16) & 0xFF);
127 pm860x_page_reg_write(info->i2c, REG2_DATA, (base >> 8) & 0xFF);
128 pm860x_page_reg_write(info->i2c, REG3_DATA, base & 0xFF);
129
130 return 0;
131}
132
133static int pm860x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
134{
135 struct pm860x_rtc_info *info = dev_get_drvdata(dev);
136 unsigned char buf[8];
137 unsigned long ticks, base, data;
138 int ret;
139
140 pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
141 dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
142 buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
143 base = ((unsigned long)buf[1] << 24) | (buf[3] << 16) |
144 (buf[5] << 8) | buf[7];
145
146 pm860x_bulk_read(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
147 data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
148 (buf[1] << 8) | buf[0];
149 ticks = base + data;
150 dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
151 base, data, ticks);
152
153 rtc_time64_to_tm(ticks, &alrm->time);
154 ret = pm860x_reg_read(info->i2c, PM8607_RTC1);
155 alrm->enabled = (ret & ALARM_EN) ? 1 : 0;
156 alrm->pending = (ret & (ALARM | ALARM_WAKEUP)) ? 1 : 0;
157 return 0;
158}
159
160static int pm860x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
161{
162 struct pm860x_rtc_info *info = dev_get_drvdata(dev);
163 unsigned long ticks, base, data;
164 unsigned char buf[8];
165 int mask;
166
167 pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0);
168
169 pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
170 dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
171 buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
172 base = ((unsigned long)buf[1] << 24) | (buf[3] << 16) |
173 (buf[5] << 8) | buf[7];
174
175 ticks = rtc_tm_to_time64(&alrm->time);
176 data = ticks - base;
177
178 buf[0] = data & 0xff;
179 buf[1] = (data >> 8) & 0xff;
180 buf[2] = (data >> 16) & 0xff;
181 buf[3] = (data >> 24) & 0xff;
182 pm860x_bulk_write(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
183 if (alrm->enabled) {
184 mask = ALARM | ALARM_WAKEUP | ALARM_EN;
185 pm860x_set_bits(info->i2c, PM8607_RTC1, mask, mask);
186 } else {
187 mask = ALARM | ALARM_WAKEUP | ALARM_EN;
188 pm860x_set_bits(info->i2c, PM8607_RTC1, mask,
189 ALARM | ALARM_WAKEUP);
190 }
191 return 0;
192}
193
194static const struct rtc_class_ops pm860x_rtc_ops = {
195 .read_time = pm860x_rtc_read_time,
196 .set_time = pm860x_rtc_set_time,
197 .read_alarm = pm860x_rtc_read_alarm,
198 .set_alarm = pm860x_rtc_set_alarm,
199 .alarm_irq_enable = pm860x_rtc_alarm_irq_enable,
200};
201
202#ifdef VRTC_CALIBRATION
203static void calibrate_vrtc_work(struct work_struct *work)
204{
205 struct pm860x_rtc_info *info = container_of(work,
206 struct pm860x_rtc_info, calib_work.work);
207 unsigned char buf[2];
208 unsigned int sum, data, mean, vrtc_set;
209 int i;
210
211 for (i = 0, sum = 0; i < 16; i++) {
212 msleep(100);
213 pm860x_bulk_read(info->i2c, REG_VRTC_MEAS1, 2, buf);
214 data = (buf[0] << 4) | buf[1];
215 data = (data * 5400) >> 12;
216 sum += data;
217 }
218 mean = sum >> 4;
219 vrtc_set = 2700 + (info->vrtc & 0x3) * 200;
220 dev_dbg(info->dev, "mean:%d, vrtc_set:%d\n", mean, vrtc_set);
221
222 sum = pm860x_reg_read(info->i2c, PM8607_RTC_MISC1);
223 data = sum & 0x3;
224 if ((mean + 200) < vrtc_set) {
225
226 if (++data == 4)
227 goto out;
228 data = (sum & 0xf8) | (data & 0x3);
229 pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data);
230 } else if ((mean - 200) > vrtc_set) {
231
232 if (data-- == 0)
233 goto out;
234 data = (sum & 0xf8) | (data & 0x3);
235 pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data);
236 } else
237 goto out;
238 dev_dbg(info->dev, "set 0x%x to RTC_MISC1\n", data);
239
240 schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
241 return;
242out:
243
244 pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
245 dev_dbg(info->dev, "finish VRTC calibration\n");
246 return;
247}
248#endif
249
250#ifdef CONFIG_OF
251static int pm860x_rtc_dt_init(struct platform_device *pdev,
252 struct pm860x_rtc_info *info)
253{
254 struct device_node *np = pdev->dev.parent->of_node;
255 int ret;
256 if (!np)
257 return -ENODEV;
258 np = of_get_child_by_name(np, "rtc");
259 if (!np) {
260 dev_err(&pdev->dev, "failed to find rtc node\n");
261 return -ENODEV;
262 }
263 ret = of_property_read_u32(np, "marvell,88pm860x-vrtc", &info->vrtc);
264 if (ret)
265 info->vrtc = 0;
266 of_node_put(np);
267 return 0;
268}
269#else
270#define pm860x_rtc_dt_init(x, y) do { } while (0)
271#endif
272
273static int pm860x_rtc_probe(struct platform_device *pdev)
274{
275 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
276 struct pm860x_rtc_info *info;
277 int ret;
278
279 info = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_rtc_info),
280 GFP_KERNEL);
281 if (!info)
282 return -ENOMEM;
283 info->irq = platform_get_irq(pdev, 0);
284 if (info->irq < 0)
285 return info->irq;
286
287 info->chip = chip;
288 info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
289 info->dev = &pdev->dev;
290 dev_set_drvdata(&pdev->dev, info);
291
292 info->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
293 if (IS_ERR(info->rtc_dev))
294 return PTR_ERR(info->rtc_dev);
295
296 ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
297 rtc_update_handler, IRQF_ONESHOT, "rtc",
298 info);
299 if (ret < 0) {
300 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
301 info->irq, ret);
302 return ret;
303 }
304
305
306 pm860x_page_reg_write(info->i2c, REG0_ADDR, REG0_DATA);
307 pm860x_page_reg_write(info->i2c, REG1_ADDR, REG1_DATA);
308 pm860x_page_reg_write(info->i2c, REG2_ADDR, REG2_DATA);
309 pm860x_page_reg_write(info->i2c, REG3_ADDR, REG3_DATA);
310
311 pm860x_rtc_dt_init(pdev, info);
312
313 info->rtc_dev->ops = &pm860x_rtc_ops;
314 info->rtc_dev->range_max = U32_MAX;
315
316 ret = rtc_register_device(info->rtc_dev);
317 if (ret)
318 return ret;
319
320
321
322
323
324 pm860x_set_bits(info->i2c, PM8607_RTC1, RTC1_USE_XO, RTC1_USE_XO);
325
326#ifdef VRTC_CALIBRATION
327
328 pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, MEAS2_VRTC);
329
330
331 INIT_DELAYED_WORK(&info->calib_work, calibrate_vrtc_work);
332 schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
333#endif
334
335 device_init_wakeup(&pdev->dev, 1);
336
337 return 0;
338}
339
340static int pm860x_rtc_remove(struct platform_device *pdev)
341{
342 struct pm860x_rtc_info *info = platform_get_drvdata(pdev);
343
344#ifdef VRTC_CALIBRATION
345 cancel_delayed_work_sync(&info->calib_work);
346
347 pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
348#endif
349
350 return 0;
351}
352
353#ifdef CONFIG_PM_SLEEP
354static int pm860x_rtc_suspend(struct device *dev)
355{
356 struct platform_device *pdev = to_platform_device(dev);
357 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
358
359 if (device_may_wakeup(dev))
360 chip->wakeup_flag |= 1 << PM8607_IRQ_RTC;
361 return 0;
362}
363static int pm860x_rtc_resume(struct device *dev)
364{
365 struct platform_device *pdev = to_platform_device(dev);
366 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
367
368 if (device_may_wakeup(dev))
369 chip->wakeup_flag &= ~(1 << PM8607_IRQ_RTC);
370 return 0;
371}
372#endif
373
374static SIMPLE_DEV_PM_OPS(pm860x_rtc_pm_ops, pm860x_rtc_suspend, pm860x_rtc_resume);
375
376static struct platform_driver pm860x_rtc_driver = {
377 .driver = {
378 .name = "88pm860x-rtc",
379 .pm = &pm860x_rtc_pm_ops,
380 },
381 .probe = pm860x_rtc_probe,
382 .remove = pm860x_rtc_remove,
383};
384
385module_platform_driver(pm860x_rtc_driver);
386
387MODULE_DESCRIPTION("Marvell 88PM860x RTC driver");
388MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
389MODULE_LICENSE("GPL");
390
