diff options
Diffstat (limited to 'drivers/rtc/rtc-88pm80x.c')
| -rw-r--r-- | drivers/rtc/rtc-88pm80x.c | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-88pm80x.c b/drivers/rtc/rtc-88pm80x.c new file mode 100644 index 00000000000..6367984e056 --- /dev/null +++ b/drivers/rtc/rtc-88pm80x.c @@ -0,0 +1,369 @@ +/* + * Real Time Clock driver for Marvell 88PM80x PMIC + * + * Copyright (c) 2012 Marvell International Ltd. + * Wenzeng Chen<wzch@marvell.com> + * Qiao Zhou <zhouqiao@marvell.com> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file "COPYING" in the main directory of this + * archive for more details. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/regmap.h> +#include <linux/mfd/core.h> +#include <linux/mfd/88pm80x.h> +#include <linux/rtc.h> + +#define PM800_RTC_COUNTER1 (0xD1) +#define PM800_RTC_COUNTER2 (0xD2) +#define PM800_RTC_COUNTER3 (0xD3) +#define PM800_RTC_COUNTER4 (0xD4) +#define PM800_RTC_EXPIRE1_1 (0xD5) +#define PM800_RTC_EXPIRE1_2 (0xD6) +#define PM800_RTC_EXPIRE1_3 (0xD7) +#define PM800_RTC_EXPIRE1_4 (0xD8) +#define PM800_RTC_TRIM1 (0xD9) +#define PM800_RTC_TRIM2 (0xDA) +#define PM800_RTC_TRIM3 (0xDB) +#define PM800_RTC_TRIM4 (0xDC) +#define PM800_RTC_EXPIRE2_1 (0xDD) +#define PM800_RTC_EXPIRE2_2 (0xDE) +#define PM800_RTC_EXPIRE2_3 (0xDF) +#define PM800_RTC_EXPIRE2_4 (0xE0) + +#define PM800_POWER_DOWN_LOG1 (0xE5) +#define PM800_POWER_DOWN_LOG2 (0xE6) + +struct pm80x_rtc_info { + struct pm80x_chip *chip; + struct regmap *map; + struct rtc_device *rtc_dev; + struct device *dev; + struct delayed_work calib_work; + + int irq; + int vrtc; +}; + +static irqreturn_t rtc_update_handler(int irq, void *data) +{ + struct pm80x_rtc_info *info = (struct pm80x_rtc_info *)data; + int mask; + + mask = PM800_ALARM | PM800_ALARM_WAKEUP; + regmap_update_bits(info->map, PM800_RTC_CONTROL, mask | PM800_ALARM1_EN, + mask); + rtc_update_irq(info->rtc_dev, 1, RTC_AF); + return IRQ_HANDLED; +} + +static int pm80x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) +{ + struct pm80x_rtc_info *info = dev_get_drvdata(dev); + + if (enabled) + regmap_update_bits(info->map, PM800_RTC_CONTROL, + PM800_ALARM1_EN, PM800_ALARM1_EN); + else + regmap_update_bits(info->map, PM800_RTC_CONTROL, + PM800_ALARM1_EN, 0); + return 0; +} + +/* + * Calculate the next alarm time given the requested alarm time mask + * and the current time. + */ +static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now, + struct rtc_time *alrm) +{ + unsigned long next_time; + unsigned long now_time; + + next->tm_year = now->tm_year; + next->tm_mon = now->tm_mon; + next->tm_mday = now->tm_mday; + next->tm_hour = alrm->tm_hour; + next->tm_min = alrm->tm_min; + next->tm_sec = alrm->tm_sec; + + rtc_tm_to_time(now, &now_time); + rtc_tm_to_time(next, &next_time); + + if (next_time < now_time) { + /* Advance one day */ + next_time += 60 * 60 * 24; + rtc_time_to_tm(next_time, next); + } +} + +static int pm80x_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct pm80x_rtc_info *info = dev_get_drvdata(dev); + unsigned char buf[4]; + unsigned long ticks, base, data; + regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4); + base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; + dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]); + + /* load 32-bit read-only counter */ + regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4); + data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; + ticks = base + data; + dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", + base, data, ticks); + rtc_time_to_tm(ticks, tm); + return 0; +} + +static int pm80x_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct pm80x_rtc_info *info = dev_get_drvdata(dev); + unsigned char buf[4]; + unsigned long ticks, base, data; + if ((tm->tm_year < 70) || (tm->tm_year > 138)) { + dev_dbg(info->dev, + "Set time %d out of range. Please set time between 1970 to 2038.\n", + 1900 + tm->tm_year); + return -EINVAL; + } + rtc_tm_to_time(tm, &ticks); + + /* load 32-bit read-only counter */ + regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4); + data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; + base = ticks - data; + dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", + base, data, ticks); + buf[0] = base & 0xFF; + buf[1] = (base >> 8) & 0xFF; + buf[2] = (base >> 16) & 0xFF; + buf[3] = (base >> 24) & 0xFF; + regmap_raw_write(info->map, PM800_RTC_EXPIRE2_1, buf, 4); + + return 0; +} + +static int pm80x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct pm80x_rtc_info *info = dev_get_drvdata(dev); + unsigned char buf[4]; + unsigned long ticks, base, data; + int ret; + + regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4); + base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; + dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]); + + regmap_raw_read(info->map, PM800_RTC_EXPIRE1_1, buf, 4); + data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; + ticks = base + data; + dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", + base, data, ticks); + + rtc_time_to_tm(ticks, &alrm->time); + regmap_read(info->map, PM800_RTC_CONTROL, &ret); + alrm->enabled = (ret & PM800_ALARM1_EN) ? 1 : 0; + alrm->pending = (ret & (PM800_ALARM | PM800_ALARM_WAKEUP)) ? 1 : 0; + return 0; +} + +static int pm80x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct pm80x_rtc_info *info = dev_get_drvdata(dev); + struct rtc_time now_tm, alarm_tm; + unsigned long ticks, base, data; + unsigned char buf[4]; + int mask; + + regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0); + + regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4); + base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; + dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]); + + /* load 32-bit read-only counter */ + regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4); + data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; + ticks = base + data; + dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", + base, data, ticks); + + rtc_time_to_tm(ticks, &now_tm); + dev_dbg(info->dev, "%s, now time : %lu\n", __func__, ticks); + rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time); + /* get new ticks for alarm in 24 hours */ + rtc_tm_to_time(&alarm_tm, &ticks); + dev_dbg(info->dev, "%s, alarm time: %lu\n", __func__, ticks); + data = ticks - base; + + buf[0] = data & 0xff; + buf[1] = (data >> 8) & 0xff; + buf[2] = (data >> 16) & 0xff; + buf[3] = (data >> 24) & 0xff; + regmap_raw_write(info->map, PM800_RTC_EXPIRE1_1, buf, 4); + if (alrm->enabled) { + mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN; + regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, mask); + } else { + mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN; + regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, + PM800_ALARM | PM800_ALARM_WAKEUP); + } + return 0; +} + +static const struct rtc_class_ops pm80x_rtc_ops = { + .read_time = pm80x_rtc_read_time, + .set_time = pm80x_rtc_set_time, + .read_alarm = pm80x_rtc_read_alarm, + .set_alarm = pm80x_rtc_set_alarm, + .alarm_irq_enable = pm80x_rtc_alarm_irq_enable, +}; + +#ifdef CONFIG_PM +static int pm80x_rtc_suspend(struct device *dev) +{ + return pm80x_dev_suspend(dev); +} + +static int pm80x_rtc_resume(struct device *dev) +{ + return pm80x_dev_resume(dev); +} +#endif + +static SIMPLE_DEV_PM_OPS(pm80x_rtc_pm_ops, pm80x_rtc_suspend, pm80x_rtc_resume); + +static int __devinit pm80x_rtc_probe(struct platform_device *pdev) +{ + struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent); + struct pm80x_platform_data *pm80x_pdata; + struct pm80x_rtc_pdata *pdata = NULL; + struct pm80x_rtc_info *info; + struct rtc_time tm; + unsigned long ticks = 0; + int ret; + + pdata = pdev->dev.platform_data; + if (pdata == NULL) + dev_warn(&pdev->dev, "No platform data!\n"); + + info = + devm_kzalloc(&pdev->dev, sizeof(struct pm80x_rtc_info), GFP_KERNEL); + if (!info) + return -ENOMEM; + info->irq = platform_get_irq(pdev, 0); + if (info->irq < 0) { + dev_err(&pdev->dev, "No IRQ resource!\n"); + ret = -EINVAL; + goto out; + } + + info->chip = chip; + info->map = chip->regmap; + if (!info->map) { + dev_err(&pdev->dev, "no regmap!\n"); + ret = -EINVAL; + goto out; + } + + info->dev = &pdev->dev; + dev_set_drvdata(&pdev->dev, info); + + ret = pm80x_request_irq(chip, info->irq, rtc_update_handler, + IRQF_ONESHOT, "rtc", info); + if (ret < 0) { + dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", + info->irq, ret); + goto out; + } + + ret = pm80x_rtc_read_time(&pdev->dev, &tm); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to read initial time.\n"); + goto out_rtc; + } + if ((tm.tm_year < 70) || (tm.tm_year > 138)) { + tm.tm_year = 70; + tm.tm_mon = 0; + tm.tm_mday = 1; + tm.tm_hour = 0; + tm.tm_min = 0; + tm.tm_sec = 0; + ret = pm80x_rtc_set_time(&pdev->dev, &tm); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to set initial time.\n"); + goto out_rtc; + } + } + rtc_tm_to_time(&tm, &ticks); + + info->rtc_dev = rtc_device_register("88pm80x-rtc", &pdev->dev, + &pm80x_rtc_ops, THIS_MODULE); + if (IS_ERR(info->rtc_dev)) { + ret = PTR_ERR(info->rtc_dev); + dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); + goto out_rtc; + } + /* + * enable internal XO instead of internal 3.25MHz clock since it can + * free running in PMIC power-down state. + */ + regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_RTC1_USE_XO, + PM800_RTC1_USE_XO); + + if (pdev->dev.parent->platform_data) { + pm80x_pdata = pdev->dev.parent->platform_data; + pdata = pm80x_pdata->rtc; + if (pdata) + info->rtc_dev->dev.platform_data = &pdata->rtc_wakeup; + } + + device_init_wakeup(&pdev->dev, 1); + + return 0; +out_rtc: + pm80x_free_irq(chip, info->irq, info); +out: + return ret; +} + +static int __devexit pm80x_rtc_remove(struct platform_device *pdev) +{ + struct pm80x_rtc_info *info = platform_get_drvdata(pdev); + platform_set_drvdata(pdev, NULL); + rtc_device_unregister(info->rtc_dev); + pm80x_free_irq(info->chip, info->irq, info); + return 0; +} + +static struct platform_driver pm80x_rtc_driver = { + .driver = { + .name = "88pm80x-rtc", + .owner = THIS_MODULE, + .pm = &pm80x_rtc_pm_ops, + }, + .probe = pm80x_rtc_probe, + .remove = __devexit_p(pm80x_rtc_remove), +}; + +module_platform_driver(pm80x_rtc_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Marvell 88PM80x RTC driver"); +MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>"); +MODULE_ALIAS("platform:88pm80x-rtc"); |