rtc: Add rtc support to 88PM80X PMIC (2985c29c) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/rtc/Kconfig

+10 −0

Original line number	Diff line number	Diff line
		@@ -135,6 +135,16 @@ config RTC_DRV_88PM860X
		This driver can also be built as a module. If so, the module
		will be called rtc-88pm860x.

		config RTC_DRV_88PM80X
		tristate "Marvell 88PM80x"
		depends on RTC_CLASS && I2C && MFD_88PM800
		help
		If you say yes here you get support for RTC function in Marvell
		88PM80x chips.

		This driver can also be built as a module. If so, the module
		will be called rtc-88pm80x.

		config RTC_DRV_DS1307
		tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
		help

drivers/rtc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@ rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
		# Keep the list ordered.

		obj-$(CONFIG_RTC_DRV_88PM860X) += rtc-88pm860x.o
		obj-$(CONFIG_RTC_DRV_88PM80X) += rtc-88pm80x.o
		obj-$(CONFIG_RTC_DRV_AB3100) += rtc-ab3100.o
		obj-$(CONFIG_RTC_DRV_AB8500) += rtc-ab8500.o
		obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o

drivers/rtc/rtc-88pm80x.c

0 → 100644

+371 −0

Original line number	Diff line number	Diff line
		/*
		* 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);
		ret = PTR_ERR(info->rtc_dev);
		if (IS_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:
		devm_kfree(&pdev->dev, info);
		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);
		devm_kfree(&pdev->dev, 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");