Root/drivers/rtc/rtc-88pm80x.c

1/*
2 * Real Time Clock driver for Marvell 88PM80x PMIC
3 *
4 * Copyright (c) 2012 Marvell International Ltd.
5 * Wenzeng Chen<wzch@marvell.com>
6 * Qiao Zhou <zhouqiao@marvell.com>
7 *
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.
11 *
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.
16 *
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
20 */
21
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>
29
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)
46
47#define PM800_POWER_DOWN_LOG1 (0xE5)
48#define PM800_POWER_DOWN_LOG2 (0xE6)
49
50struct pm80x_rtc_info {
51    struct pm80x_chip *chip;
52    struct regmap *map;
53    struct rtc_device *rtc_dev;
54    struct device *dev;
55    struct delayed_work calib_work;
56
57    int irq;
58    int vrtc;
59};
60
61static irqreturn_t rtc_update_handler(int irq, void *data)
62{
63    struct pm80x_rtc_info *info = (struct pm80x_rtc_info *)data;
64    int mask;
65
66    mask = PM800_ALARM | PM800_ALARM_WAKEUP;
67    regmap_update_bits(info->map, PM800_RTC_CONTROL, mask | PM800_ALARM1_EN,
68               mask);
69    rtc_update_irq(info->rtc_dev, 1, RTC_AF);
70    return IRQ_HANDLED;
71}
72
73static int pm80x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
74{
75    struct pm80x_rtc_info *info = dev_get_drvdata(dev);
76
77    if (enabled)
78        regmap_update_bits(info->map, PM800_RTC_CONTROL,
79                   PM800_ALARM1_EN, PM800_ALARM1_EN);
80    else
81        regmap_update_bits(info->map, PM800_RTC_CONTROL,
82                   PM800_ALARM1_EN, 0);
83    return 0;
84}
85
86/*
87 * Calculate the next alarm time given the requested alarm time mask
88 * and the current time.
89 */
90static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now,
91                struct rtc_time *alrm)
92{
93    unsigned long next_time;
94    unsigned long now_time;
95
96    next->tm_year = now->tm_year;
97    next->tm_mon = now->tm_mon;
98    next->tm_mday = now->tm_mday;
99    next->tm_hour = alrm->tm_hour;
100    next->tm_min = alrm->tm_min;
101    next->tm_sec = alrm->tm_sec;
102
103    rtc_tm_to_time(now, &now_time);
104    rtc_tm_to_time(next, &next_time);
105
106    if (next_time < now_time) {
107        /* Advance one day */
108        next_time += 60 * 60 * 24;
109        rtc_time_to_tm(next_time, next);
110    }
111}
112
113static int pm80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
114{
115    struct pm80x_rtc_info *info = dev_get_drvdata(dev);
116    unsigned char buf[4];
117    unsigned long ticks, base, data;
118    regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
119    base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
120    dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
121
122    /* load 32-bit read-only counter */
123    regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
124    data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
125    ticks = base + data;
126    dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
127        base, data, ticks);
128    rtc_time_to_tm(ticks, tm);
129    return 0;
130}
131
132static int pm80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
133{
134    struct pm80x_rtc_info *info = dev_get_drvdata(dev);
135    unsigned char buf[4];
136    unsigned long ticks, base, data;
137    if ((tm->tm_year < 70) || (tm->tm_year > 138)) {
138        dev_dbg(info->dev,
139            "Set time %d out of range. Please set time between 1970 to 2038.\n",
140            1900 + tm->tm_year);
141        return -EINVAL;
142    }
143    rtc_tm_to_time(tm, &ticks);
144
145    /* load 32-bit read-only counter */
146    regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
147    data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
148    base = ticks - data;
149    dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
150        base, data, ticks);
151    buf[0] = base & 0xFF;
152    buf[1] = (base >> 8) & 0xFF;
153    buf[2] = (base >> 16) & 0xFF;
154    buf[3] = (base >> 24) & 0xFF;
155    regmap_raw_write(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
156
157    return 0;
158}
159
160static int pm80x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
161{
162    struct pm80x_rtc_info *info = dev_get_drvdata(dev);
163    unsigned char buf[4];
164    unsigned long ticks, base, data;
165    int ret;
166
167    regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
168    base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
169    dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
170
171    regmap_raw_read(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
172    data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
173    ticks = base + data;
174    dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
175        base, data, ticks);
176
177    rtc_time_to_tm(ticks, &alrm->time);
178    regmap_read(info->map, PM800_RTC_CONTROL, &ret);
179    alrm->enabled = (ret & PM800_ALARM1_EN) ? 1 : 0;
180    alrm->pending = (ret & (PM800_ALARM | PM800_ALARM_WAKEUP)) ? 1 : 0;
181    return 0;
182}
183
184static int pm80x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
185{
186    struct pm80x_rtc_info *info = dev_get_drvdata(dev);
187    struct rtc_time now_tm, alarm_tm;
188    unsigned long ticks, base, data;
189    unsigned char buf[4];
190    int mask;
191
192    regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0);
193
194    regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
195    base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
196    dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
197
198    /* load 32-bit read-only counter */
199    regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
200    data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
201    ticks = base + data;
202    dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
203        base, data, ticks);
204
205    rtc_time_to_tm(ticks, &now_tm);
206    dev_dbg(info->dev, "%s, now time : %lu\n", __func__, ticks);
207    rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time);
208    /* get new ticks for alarm in 24 hours */
209    rtc_tm_to_time(&alarm_tm, &ticks);
210    dev_dbg(info->dev, "%s, alarm time: %lu\n", __func__, ticks);
211    data = ticks - base;
212
213    buf[0] = data & 0xff;
214    buf[1] = (data >> 8) & 0xff;
215    buf[2] = (data >> 16) & 0xff;
216    buf[3] = (data >> 24) & 0xff;
217    regmap_raw_write(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
218    if (alrm->enabled) {
219        mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN;
220        regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, mask);
221    } else {
222        mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN;
223        regmap_update_bits(info->map, PM800_RTC_CONTROL, mask,
224                   PM800_ALARM | PM800_ALARM_WAKEUP);
225    }
226    return 0;
227}
228
229static const struct rtc_class_ops pm80x_rtc_ops = {
230    .read_time = pm80x_rtc_read_time,
231    .set_time = pm80x_rtc_set_time,
232    .read_alarm = pm80x_rtc_read_alarm,
233    .set_alarm = pm80x_rtc_set_alarm,
234    .alarm_irq_enable = pm80x_rtc_alarm_irq_enable,
235};
236
237#ifdef CONFIG_PM
238static int pm80x_rtc_suspend(struct device *dev)
239{
240    return pm80x_dev_suspend(dev);
241}
242
243static int pm80x_rtc_resume(struct device *dev)
244{
245    return pm80x_dev_resume(dev);
246}
247#endif
248
249static SIMPLE_DEV_PM_OPS(pm80x_rtc_pm_ops, pm80x_rtc_suspend, pm80x_rtc_resume);
250
251static int __devinit pm80x_rtc_probe(struct platform_device *pdev)
252{
253    struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
254    struct pm80x_platform_data *pm80x_pdata;
255    struct pm80x_rtc_pdata *pdata = NULL;
256    struct pm80x_rtc_info *info;
257    struct rtc_time tm;
258    unsigned long ticks = 0;
259    int ret;
260
261    pdata = pdev->dev.platform_data;
262    if (pdata == NULL)
263        dev_warn(&pdev->dev, "No platform data!\n");
264
265    info =
266        devm_kzalloc(&pdev->dev, sizeof(struct pm80x_rtc_info), GFP_KERNEL);
267    if (!info)
268        return -ENOMEM;
269    info->irq = platform_get_irq(pdev, 0);
270    if (info->irq < 0) {
271        dev_err(&pdev->dev, "No IRQ resource!\n");
272        ret = -EINVAL;
273        goto out;
274    }
275
276    info->chip = chip;
277    info->map = chip->regmap;
278    if (!info->map) {
279        dev_err(&pdev->dev, "no regmap!\n");
280        ret = -EINVAL;
281        goto out;
282    }
283
284    info->dev = &pdev->dev;
285    dev_set_drvdata(&pdev->dev, info);
286
287    ret = pm80x_request_irq(chip, info->irq, rtc_update_handler,
288                IRQF_ONESHOT, "rtc", info);
289    if (ret < 0) {
290        dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
291            info->irq, ret);
292        goto out;
293    }
294
295    ret = pm80x_rtc_read_time(&pdev->dev, &tm);
296    if (ret < 0) {
297        dev_err(&pdev->dev, "Failed to read initial time.\n");
298        goto out_rtc;
299    }
300    if ((tm.tm_year < 70) || (tm.tm_year > 138)) {
301        tm.tm_year = 70;
302        tm.tm_mon = 0;
303        tm.tm_mday = 1;
304        tm.tm_hour = 0;
305        tm.tm_min = 0;
306        tm.tm_sec = 0;
307        ret = pm80x_rtc_set_time(&pdev->dev, &tm);
308        if (ret < 0) {
309            dev_err(&pdev->dev, "Failed to set initial time.\n");
310            goto out_rtc;
311        }
312    }
313    rtc_tm_to_time(&tm, &ticks);
314
315    info->rtc_dev = rtc_device_register("88pm80x-rtc", &pdev->dev,
316                        &pm80x_rtc_ops, THIS_MODULE);
317    if (IS_ERR(info->rtc_dev)) {
318        ret = PTR_ERR(info->rtc_dev);
319        dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
320        goto out_rtc;
321    }
322    /*
323     * enable internal XO instead of internal 3.25MHz clock since it can
324     * free running in PMIC power-down state.
325     */
326    regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_RTC1_USE_XO,
327               PM800_RTC1_USE_XO);
328
329    if (pdev->dev.parent->platform_data) {
330        pm80x_pdata = pdev->dev.parent->platform_data;
331        pdata = pm80x_pdata->rtc;
332        if (pdata)
333            info->rtc_dev->dev.platform_data = &pdata->rtc_wakeup;
334    }
335
336    device_init_wakeup(&pdev->dev, 1);
337
338    return 0;
339out_rtc:
340    pm80x_free_irq(chip, info->irq, info);
341out:
342    return ret;
343}
344
345static int __devexit pm80x_rtc_remove(struct platform_device *pdev)
346{
347    struct pm80x_rtc_info *info = platform_get_drvdata(pdev);
348    platform_set_drvdata(pdev, NULL);
349    rtc_device_unregister(info->rtc_dev);
350    pm80x_free_irq(info->chip, info->irq, info);
351    return 0;
352}
353
354static struct platform_driver pm80x_rtc_driver = {
355    .driver = {
356           .name = "88pm80x-rtc",
357           .owner = THIS_MODULE,
358           .pm = &pm80x_rtc_pm_ops,
359           },
360    .probe = pm80x_rtc_probe,
361    .remove = __devexit_p(pm80x_rtc_remove),
362};
363
364module_platform_driver(pm80x_rtc_driver);
365
366MODULE_LICENSE("GPL");
367MODULE_DESCRIPTION("Marvell 88PM80x RTC driver");
368MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
369MODULE_ALIAS("platform:88pm80x-rtc");
370

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