1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2008b3040SHaojian Zhuang /*
3008b3040SHaojian Zhuang * Real Time Clock driver for Marvell 88PM860x PMIC
4008b3040SHaojian Zhuang *
5008b3040SHaojian Zhuang * Copyright (c) 2010 Marvell International Ltd.
6008b3040SHaojian Zhuang * Author: Haojian Zhuang <haojian.zhuang@marvell.com>
7008b3040SHaojian Zhuang */
8008b3040SHaojian Zhuang
9008b3040SHaojian Zhuang #include <linux/kernel.h>
10008b3040SHaojian Zhuang #include <linux/module.h>
112e57d567SHaojian Zhuang #include <linux/of.h>
12008b3040SHaojian Zhuang #include <linux/platform_device.h>
13008b3040SHaojian Zhuang #include <linux/slab.h>
14008b3040SHaojian Zhuang #include <linux/mutex.h>
15008b3040SHaojian Zhuang #include <linux/rtc.h>
16008b3040SHaojian Zhuang #include <linux/delay.h>
17008b3040SHaojian Zhuang #include <linux/mfd/core.h>
18008b3040SHaojian Zhuang #include <linux/mfd/88pm860x.h>
19008b3040SHaojian Zhuang
20008b3040SHaojian Zhuang #define VRTC_CALIBRATION
21008b3040SHaojian Zhuang
22008b3040SHaojian Zhuang struct pm860x_rtc_info {
23008b3040SHaojian Zhuang struct pm860x_chip *chip;
24008b3040SHaojian Zhuang struct i2c_client *i2c;
25008b3040SHaojian Zhuang struct rtc_device *rtc_dev;
26008b3040SHaojian Zhuang struct device *dev;
27008b3040SHaojian Zhuang struct delayed_work calib_work;
28008b3040SHaojian Zhuang
29008b3040SHaojian Zhuang int irq;
30008b3040SHaojian Zhuang int vrtc;
31008b3040SHaojian Zhuang };
32008b3040SHaojian Zhuang
33008b3040SHaojian Zhuang #define REG_VRTC_MEAS1 0x7D
34008b3040SHaojian Zhuang
35008b3040SHaojian Zhuang #define REG0_ADDR 0xB0
36008b3040SHaojian Zhuang #define REG1_ADDR 0xB2
37008b3040SHaojian Zhuang #define REG2_ADDR 0xB4
38008b3040SHaojian Zhuang #define REG3_ADDR 0xB6
39008b3040SHaojian Zhuang
40008b3040SHaojian Zhuang #define REG0_DATA 0xB1
41008b3040SHaojian Zhuang #define REG1_DATA 0xB3
42008b3040SHaojian Zhuang #define REG2_DATA 0xB5
43008b3040SHaojian Zhuang #define REG3_DATA 0xB7
44008b3040SHaojian Zhuang
45008b3040SHaojian Zhuang /* bit definitions of Measurement Enable Register 2 (0x51) */
46008b3040SHaojian Zhuang #define MEAS2_VRTC (1 << 0)
47008b3040SHaojian Zhuang
48008b3040SHaojian Zhuang /* bit definitions of RTC Register 1 (0xA0) */
49008b3040SHaojian Zhuang #define ALARM_EN (1 << 3)
50008b3040SHaojian Zhuang #define ALARM_WAKEUP (1 << 4)
51008b3040SHaojian Zhuang #define ALARM (1 << 5)
52008b3040SHaojian Zhuang #define RTC1_USE_XO (1 << 7)
53008b3040SHaojian Zhuang
54008b3040SHaojian Zhuang #define VRTC_CALIB_INTERVAL (HZ * 60 * 10) /* 10 minutes */
55008b3040SHaojian Zhuang
rtc_update_handler(int irq,void * data)56008b3040SHaojian Zhuang static irqreturn_t rtc_update_handler(int irq, void *data)
57008b3040SHaojian Zhuang {
58008b3040SHaojian Zhuang struct pm860x_rtc_info *info = (struct pm860x_rtc_info *)data;
59008b3040SHaojian Zhuang int mask;
60008b3040SHaojian Zhuang
61008b3040SHaojian Zhuang mask = ALARM | ALARM_WAKEUP;
62008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_RTC1, mask | ALARM_EN, mask);
63008b3040SHaojian Zhuang rtc_update_irq(info->rtc_dev, 1, RTC_AF);
64008b3040SHaojian Zhuang return IRQ_HANDLED;
65008b3040SHaojian Zhuang }
66008b3040SHaojian Zhuang
pm860x_rtc_alarm_irq_enable(struct device * dev,unsigned int enabled)67008b3040SHaojian Zhuang static int pm860x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
68008b3040SHaojian Zhuang {
69008b3040SHaojian Zhuang struct pm860x_rtc_info *info = dev_get_drvdata(dev);
70008b3040SHaojian Zhuang
71008b3040SHaojian Zhuang if (enabled)
72fd835d1fSJett.Zhou pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, ALARM_EN);
73008b3040SHaojian Zhuang else
74fd835d1fSJett.Zhou pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0);
75008b3040SHaojian Zhuang return 0;
76008b3040SHaojian Zhuang }
77008b3040SHaojian Zhuang
pm860x_rtc_read_time(struct device * dev,struct rtc_time * tm)78008b3040SHaojian Zhuang static int pm860x_rtc_read_time(struct device *dev, struct rtc_time *tm)
79008b3040SHaojian Zhuang {
80008b3040SHaojian Zhuang struct pm860x_rtc_info *info = dev_get_drvdata(dev);
81008b3040SHaojian Zhuang unsigned char buf[8];
82008b3040SHaojian Zhuang unsigned long ticks, base, data;
83008b3040SHaojian Zhuang
84008b3040SHaojian Zhuang pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
85008b3040SHaojian Zhuang dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
86008b3040SHaojian Zhuang buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
87dc9e4716SColin Ian King base = ((unsigned long)buf[1] << 24) | (buf[3] << 16) |
88dc9e4716SColin Ian King (buf[5] << 8) | buf[7];
89008b3040SHaojian Zhuang
90008b3040SHaojian Zhuang /* load 32-bit read-only counter */
91008b3040SHaojian Zhuang pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
92dc9e4716SColin Ian King data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
93dc9e4716SColin Ian King (buf[1] << 8) | buf[0];
94008b3040SHaojian Zhuang ticks = base + data;
95008b3040SHaojian Zhuang dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
96008b3040SHaojian Zhuang base, data, ticks);
97008b3040SHaojian Zhuang
98b2a2aa63SAlexandre Belloni rtc_time64_to_tm(ticks, tm);
99008b3040SHaojian Zhuang
100008b3040SHaojian Zhuang return 0;
101008b3040SHaojian Zhuang }
102008b3040SHaojian Zhuang
pm860x_rtc_set_time(struct device * dev,struct rtc_time * tm)103008b3040SHaojian Zhuang static int pm860x_rtc_set_time(struct device *dev, struct rtc_time *tm)
104008b3040SHaojian Zhuang {
105008b3040SHaojian Zhuang struct pm860x_rtc_info *info = dev_get_drvdata(dev);
106008b3040SHaojian Zhuang unsigned char buf[4];
107008b3040SHaojian Zhuang unsigned long ticks, base, data;
108008b3040SHaojian Zhuang
109b2a2aa63SAlexandre Belloni ticks = rtc_tm_to_time64(tm);
110008b3040SHaojian Zhuang
111008b3040SHaojian Zhuang /* load 32-bit read-only counter */
112008b3040SHaojian Zhuang pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
113dc9e4716SColin Ian King data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
114dc9e4716SColin Ian King (buf[1] << 8) | buf[0];
115008b3040SHaojian Zhuang base = ticks - data;
116008b3040SHaojian Zhuang dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
117008b3040SHaojian Zhuang base, data, ticks);
118008b3040SHaojian Zhuang
119008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG0_DATA, (base >> 24) & 0xFF);
120008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG1_DATA, (base >> 16) & 0xFF);
121008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG2_DATA, (base >> 8) & 0xFF);
122008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG3_DATA, base & 0xFF);
123008b3040SHaojian Zhuang
124008b3040SHaojian Zhuang return 0;
125008b3040SHaojian Zhuang }
126008b3040SHaojian Zhuang
pm860x_rtc_read_alarm(struct device * dev,struct rtc_wkalrm * alrm)127008b3040SHaojian Zhuang static int pm860x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
128008b3040SHaojian Zhuang {
129008b3040SHaojian Zhuang struct pm860x_rtc_info *info = dev_get_drvdata(dev);
130008b3040SHaojian Zhuang unsigned char buf[8];
131008b3040SHaojian Zhuang unsigned long ticks, base, data;
132008b3040SHaojian Zhuang int ret;
133008b3040SHaojian Zhuang
134008b3040SHaojian Zhuang pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
135008b3040SHaojian Zhuang dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
136008b3040SHaojian Zhuang buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
137dc9e4716SColin Ian King base = ((unsigned long)buf[1] << 24) | (buf[3] << 16) |
138dc9e4716SColin Ian King (buf[5] << 8) | buf[7];
139008b3040SHaojian Zhuang
140008b3040SHaojian Zhuang pm860x_bulk_read(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
141dc9e4716SColin Ian King data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
142dc9e4716SColin Ian King (buf[1] << 8) | buf[0];
143008b3040SHaojian Zhuang ticks = base + data;
144008b3040SHaojian Zhuang dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
145008b3040SHaojian Zhuang base, data, ticks);
146008b3040SHaojian Zhuang
147b2a2aa63SAlexandre Belloni rtc_time64_to_tm(ticks, &alrm->time);
148008b3040SHaojian Zhuang ret = pm860x_reg_read(info->i2c, PM8607_RTC1);
149008b3040SHaojian Zhuang alrm->enabled = (ret & ALARM_EN) ? 1 : 0;
150008b3040SHaojian Zhuang alrm->pending = (ret & (ALARM | ALARM_WAKEUP)) ? 1 : 0;
151008b3040SHaojian Zhuang return 0;
152008b3040SHaojian Zhuang }
153008b3040SHaojian Zhuang
pm860x_rtc_set_alarm(struct device * dev,struct rtc_wkalrm * alrm)154008b3040SHaojian Zhuang static int pm860x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
155008b3040SHaojian Zhuang {
156008b3040SHaojian Zhuang struct pm860x_rtc_info *info = dev_get_drvdata(dev);
157008b3040SHaojian Zhuang unsigned long ticks, base, data;
158008b3040SHaojian Zhuang unsigned char buf[8];
159008b3040SHaojian Zhuang int mask;
160008b3040SHaojian Zhuang
161008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0);
162008b3040SHaojian Zhuang
163008b3040SHaojian Zhuang pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
164008b3040SHaojian Zhuang dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
165008b3040SHaojian Zhuang buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
166dc9e4716SColin Ian King base = ((unsigned long)buf[1] << 24) | (buf[3] << 16) |
167dc9e4716SColin Ian King (buf[5] << 8) | buf[7];
168008b3040SHaojian Zhuang
169b2a2aa63SAlexandre Belloni ticks = rtc_tm_to_time64(&alrm->time);
170008b3040SHaojian Zhuang data = ticks - base;
171008b3040SHaojian Zhuang
172008b3040SHaojian Zhuang buf[0] = data & 0xff;
173008b3040SHaojian Zhuang buf[1] = (data >> 8) & 0xff;
174008b3040SHaojian Zhuang buf[2] = (data >> 16) & 0xff;
175008b3040SHaojian Zhuang buf[3] = (data >> 24) & 0xff;
176008b3040SHaojian Zhuang pm860x_bulk_write(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
177008b3040SHaojian Zhuang if (alrm->enabled) {
178008b3040SHaojian Zhuang mask = ALARM | ALARM_WAKEUP | ALARM_EN;
179008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_RTC1, mask, mask);
180008b3040SHaojian Zhuang } else {
181008b3040SHaojian Zhuang mask = ALARM | ALARM_WAKEUP | ALARM_EN;
182008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_RTC1, mask,
183008b3040SHaojian Zhuang ALARM | ALARM_WAKEUP);
184008b3040SHaojian Zhuang }
185008b3040SHaojian Zhuang return 0;
186008b3040SHaojian Zhuang }
187008b3040SHaojian Zhuang
188008b3040SHaojian Zhuang static const struct rtc_class_ops pm860x_rtc_ops = {
189008b3040SHaojian Zhuang .read_time = pm860x_rtc_read_time,
190008b3040SHaojian Zhuang .set_time = pm860x_rtc_set_time,
191008b3040SHaojian Zhuang .read_alarm = pm860x_rtc_read_alarm,
192008b3040SHaojian Zhuang .set_alarm = pm860x_rtc_set_alarm,
193008b3040SHaojian Zhuang .alarm_irq_enable = pm860x_rtc_alarm_irq_enable,
194008b3040SHaojian Zhuang };
195008b3040SHaojian Zhuang
196008b3040SHaojian Zhuang #ifdef VRTC_CALIBRATION
calibrate_vrtc_work(struct work_struct * work)197008b3040SHaojian Zhuang static void calibrate_vrtc_work(struct work_struct *work)
198008b3040SHaojian Zhuang {
199008b3040SHaojian Zhuang struct pm860x_rtc_info *info = container_of(work,
200008b3040SHaojian Zhuang struct pm860x_rtc_info, calib_work.work);
201008b3040SHaojian Zhuang unsigned char buf[2];
202008b3040SHaojian Zhuang unsigned int sum, data, mean, vrtc_set;
203008b3040SHaojian Zhuang int i;
204008b3040SHaojian Zhuang
205008b3040SHaojian Zhuang for (i = 0, sum = 0; i < 16; i++) {
206008b3040SHaojian Zhuang msleep(100);
207008b3040SHaojian Zhuang pm860x_bulk_read(info->i2c, REG_VRTC_MEAS1, 2, buf);
208008b3040SHaojian Zhuang data = (buf[0] << 4) | buf[1];
209008b3040SHaojian Zhuang data = (data * 5400) >> 12; /* convert to mv */
210008b3040SHaojian Zhuang sum += data;
211008b3040SHaojian Zhuang }
212008b3040SHaojian Zhuang mean = sum >> 4;
213008b3040SHaojian Zhuang vrtc_set = 2700 + (info->vrtc & 0x3) * 200;
214008b3040SHaojian Zhuang dev_dbg(info->dev, "mean:%d, vrtc_set:%d\n", mean, vrtc_set);
215008b3040SHaojian Zhuang
216008b3040SHaojian Zhuang sum = pm860x_reg_read(info->i2c, PM8607_RTC_MISC1);
217008b3040SHaojian Zhuang data = sum & 0x3;
218008b3040SHaojian Zhuang if ((mean + 200) < vrtc_set) {
219008b3040SHaojian Zhuang /* try higher voltage */
220008b3040SHaojian Zhuang if (++data == 4)
221008b3040SHaojian Zhuang goto out;
222008b3040SHaojian Zhuang data = (sum & 0xf8) | (data & 0x3);
223008b3040SHaojian Zhuang pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data);
224008b3040SHaojian Zhuang } else if ((mean - 200) > vrtc_set) {
225008b3040SHaojian Zhuang /* try lower voltage */
226008b3040SHaojian Zhuang if (data-- == 0)
227008b3040SHaojian Zhuang goto out;
228008b3040SHaojian Zhuang data = (sum & 0xf8) | (data & 0x3);
229008b3040SHaojian Zhuang pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data);
230008b3040SHaojian Zhuang } else
231008b3040SHaojian Zhuang goto out;
232008b3040SHaojian Zhuang dev_dbg(info->dev, "set 0x%x to RTC_MISC1\n", data);
233008b3040SHaojian Zhuang /* trigger next calibration since VRTC is updated */
234008b3040SHaojian Zhuang schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
235008b3040SHaojian Zhuang return;
236008b3040SHaojian Zhuang out:
237008b3040SHaojian Zhuang /* disable measurement */
238008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
239008b3040SHaojian Zhuang dev_dbg(info->dev, "finish VRTC calibration\n");
240008b3040SHaojian Zhuang return;
241008b3040SHaojian Zhuang }
242008b3040SHaojian Zhuang #endif
243008b3040SHaojian Zhuang
2442e57d567SHaojian Zhuang #ifdef CONFIG_OF
pm860x_rtc_dt_init(struct platform_device * pdev,struct pm860x_rtc_info * info)2455a167f45SGreg Kroah-Hartman static int pm860x_rtc_dt_init(struct platform_device *pdev,
2462e57d567SHaojian Zhuang struct pm860x_rtc_info *info)
2472e57d567SHaojian Zhuang {
2482e57d567SHaojian Zhuang struct device_node *np = pdev->dev.parent->of_node;
2492e57d567SHaojian Zhuang int ret;
2502e57d567SHaojian Zhuang if (!np)
2512e57d567SHaojian Zhuang return -ENODEV;
252e66040cbSKrzysztof Kozlowski np = of_get_child_by_name(np, "rtc");
2532e57d567SHaojian Zhuang if (!np) {
2542e57d567SHaojian Zhuang dev_err(&pdev->dev, "failed to find rtc node\n");
2552e57d567SHaojian Zhuang return -ENODEV;
2562e57d567SHaojian Zhuang }
2572e57d567SHaojian Zhuang ret = of_property_read_u32(np, "marvell,88pm860x-vrtc", &info->vrtc);
2582e57d567SHaojian Zhuang if (ret)
2592e57d567SHaojian Zhuang info->vrtc = 0;
2601e83d48bSKrzysztof Kozlowski of_node_put(np);
2612e57d567SHaojian Zhuang return 0;
2622e57d567SHaojian Zhuang }
2632e57d567SHaojian Zhuang #else
264ccf1441dSAlexandre Belloni #define pm860x_rtc_dt_init(x, y) do { } while (0)
2652e57d567SHaojian Zhuang #endif
2662e57d567SHaojian Zhuang
pm860x_rtc_probe(struct platform_device * pdev)2675a167f45SGreg Kroah-Hartman static int pm860x_rtc_probe(struct platform_device *pdev)
268008b3040SHaojian Zhuang {
269008b3040SHaojian Zhuang struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
270008b3040SHaojian Zhuang struct pm860x_rtc_info *info;
271008b3040SHaojian Zhuang int ret;
272008b3040SHaojian Zhuang
2733087b3d0SSachin Kamat info = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_rtc_info),
2743087b3d0SSachin Kamat GFP_KERNEL);
275008b3040SHaojian Zhuang if (!info)
276008b3040SHaojian Zhuang return -ENOMEM;
277008b3040SHaojian Zhuang info->irq = platform_get_irq(pdev, 0);
278faac9102SStephen Boyd if (info->irq < 0)
2793087b3d0SSachin Kamat return info->irq;
280008b3040SHaojian Zhuang
281008b3040SHaojian Zhuang info->chip = chip;
282008b3040SHaojian Zhuang info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
283008b3040SHaojian Zhuang info->dev = &pdev->dev;
284008b3040SHaojian Zhuang dev_set_drvdata(&pdev->dev, info);
285008b3040SHaojian Zhuang
2869cf4789eSAlexandre Belloni info->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
2879cf4789eSAlexandre Belloni if (IS_ERR(info->rtc_dev))
2889cf4789eSAlexandre Belloni return PTR_ERR(info->rtc_dev);
2899cf4789eSAlexandre Belloni
2903087b3d0SSachin Kamat ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
2913087b3d0SSachin Kamat rtc_update_handler, IRQF_ONESHOT, "rtc",
2923087b3d0SSachin Kamat info);
293008b3040SHaojian Zhuang if (ret < 0) {
294008b3040SHaojian Zhuang dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
295008b3040SHaojian Zhuang info->irq, ret);
2963087b3d0SSachin Kamat return ret;
297008b3040SHaojian Zhuang }
298008b3040SHaojian Zhuang
299008b3040SHaojian Zhuang /* set addresses of 32-bit base value for RTC time */
300008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG0_ADDR, REG0_DATA);
301008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG1_ADDR, REG1_DATA);
302008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG2_ADDR, REG2_DATA);
303008b3040SHaojian Zhuang pm860x_page_reg_write(info->i2c, REG3_ADDR, REG3_DATA);
304008b3040SHaojian Zhuang
3051c9fe6d6SAlexandre Belloni pm860x_rtc_dt_init(pdev, info);
306008b3040SHaojian Zhuang
3079cf4789eSAlexandre Belloni info->rtc_dev->ops = &pm860x_rtc_ops;
308a3e49371SAlexandre Belloni info->rtc_dev->range_max = U32_MAX;
3099cf4789eSAlexandre Belloni
310fdcfd854SBartosz Golaszewski ret = devm_rtc_register_device(info->rtc_dev);
3119cf4789eSAlexandre Belloni if (ret)
3123087b3d0SSachin Kamat return ret;
313008b3040SHaojian Zhuang
314008b3040SHaojian Zhuang /*
315008b3040SHaojian Zhuang * enable internal XO instead of internal 3.25MHz clock since it can
316008b3040SHaojian Zhuang * free running in PMIC power-down state.
317008b3040SHaojian Zhuang */
318008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_RTC1, RTC1_USE_XO, RTC1_USE_XO);
319008b3040SHaojian Zhuang
320008b3040SHaojian Zhuang #ifdef VRTC_CALIBRATION
321008b3040SHaojian Zhuang /* <00> -- 2.7V, <01> -- 2.9V, <10> -- 3.1V, <11> -- 3.3V */
322008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, MEAS2_VRTC);
323008b3040SHaojian Zhuang
324008b3040SHaojian Zhuang /* calibrate VRTC */
325008b3040SHaojian Zhuang INIT_DELAYED_WORK(&info->calib_work, calibrate_vrtc_work);
326008b3040SHaojian Zhuang schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
327008b3040SHaojian Zhuang #endif /* VRTC_CALIBRATION */
3282853378bSJett.Zhou
3292853378bSJett.Zhou device_init_wakeup(&pdev->dev, 1);
3302853378bSJett.Zhou
331008b3040SHaojian Zhuang return 0;
332008b3040SHaojian Zhuang }
333008b3040SHaojian Zhuang
pm860x_rtc_remove(struct platform_device * pdev)334*8fbff75eSUwe Kleine-König static void pm860x_rtc_remove(struct platform_device *pdev)
335008b3040SHaojian Zhuang {
336008b3040SHaojian Zhuang struct pm860x_rtc_info *info = platform_get_drvdata(pdev);
337008b3040SHaojian Zhuang
338008b3040SHaojian Zhuang #ifdef VRTC_CALIBRATION
339f22b1ba1SSven Van Asbroeck cancel_delayed_work_sync(&info->calib_work);
340008b3040SHaojian Zhuang /* disable measurement */
341008b3040SHaojian Zhuang pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
342008b3040SHaojian Zhuang #endif /* VRTC_CALIBRATION */
343008b3040SHaojian Zhuang }
344008b3040SHaojian Zhuang
3452853378bSJett.Zhou #ifdef CONFIG_PM_SLEEP
pm860x_rtc_suspend(struct device * dev)3462853378bSJett.Zhou static int pm860x_rtc_suspend(struct device *dev)
3472853378bSJett.Zhou {
3482853378bSJett.Zhou struct platform_device *pdev = to_platform_device(dev);
3492853378bSJett.Zhou struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
3502853378bSJett.Zhou
3512853378bSJett.Zhou if (device_may_wakeup(dev))
3522853378bSJett.Zhou chip->wakeup_flag |= 1 << PM8607_IRQ_RTC;
3532853378bSJett.Zhou return 0;
3542853378bSJett.Zhou }
pm860x_rtc_resume(struct device * dev)3552853378bSJett.Zhou static int pm860x_rtc_resume(struct device *dev)
3562853378bSJett.Zhou {
3572853378bSJett.Zhou struct platform_device *pdev = to_platform_device(dev);
3582853378bSJett.Zhou struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
3592853378bSJett.Zhou
3602853378bSJett.Zhou if (device_may_wakeup(dev))
3612853378bSJett.Zhou chip->wakeup_flag &= ~(1 << PM8607_IRQ_RTC);
3622853378bSJett.Zhou return 0;
3632853378bSJett.Zhou }
3642853378bSJett.Zhou #endif
3652853378bSJett.Zhou
3662853378bSJett.Zhou static SIMPLE_DEV_PM_OPS(pm860x_rtc_pm_ops, pm860x_rtc_suspend, pm860x_rtc_resume);
3672853378bSJett.Zhou
368008b3040SHaojian Zhuang static struct platform_driver pm860x_rtc_driver = {
369008b3040SHaojian Zhuang .driver = {
370008b3040SHaojian Zhuang .name = "88pm860x-rtc",
3712853378bSJett.Zhou .pm = &pm860x_rtc_pm_ops,
372008b3040SHaojian Zhuang },
373008b3040SHaojian Zhuang .probe = pm860x_rtc_probe,
374*8fbff75eSUwe Kleine-König .remove_new = pm860x_rtc_remove,
375008b3040SHaojian Zhuang };
376008b3040SHaojian Zhuang
3770c4eae66SAxel Lin module_platform_driver(pm860x_rtc_driver);
378008b3040SHaojian Zhuang
379008b3040SHaojian Zhuang MODULE_DESCRIPTION("Marvell 88PM860x RTC driver");
380008b3040SHaojian Zhuang MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
381008b3040SHaojian Zhuang MODULE_LICENSE("GPL");
382