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