rtc: tps65910: add RTC driver for TPS65910 PMIC RTC (0e783980) · Commits · 戴 / test

drivers/rtc/Kconfig

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Original line number	Diff line number	Diff line
		@@ -335,6 +335,16 @@ config RTC_DRV_TWL4030
		This driver can also be built as a module. If so, the module
		will be called rtc-twl.

		config RTC_DRV_TPS65910
		tristate "TI TPS65910 RTC driver"
		depends on RTC_CLASS && MFD_TPS65910
		help
		If you say yes here you get support for the RTC on the
		TPS65910 chips.

		This driver can also be built as a module. If so, the module
		will be called rtc-tps65910.

		config RTC_DRV_S35390A
		tristate "Seiko Instruments S-35390A"
		select BITREVERSE

drivers/rtc/Makefile

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		@@ -107,6 +107,7 @@ obj-$(CONFIG_RTC_DRV_TEGRA) += rtc-tegra.o
		obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o
		obj-$(CONFIG_RTC_DRV_TILE) += rtc-tile.o
		obj-$(CONFIG_RTC_DRV_TWL4030) += rtc-twl.o
		obj-$(CONFIG_RTC_DRV_TPS65910) += rtc-tps65910.o
		obj-$(CONFIG_RTC_DRV_TX4939) += rtc-tx4939.o
		obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o
		obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o

drivers/rtc/rtc-tps65910.c

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Original line number	Diff line number	Diff line
		/*
		* rtc-tps65910.c -- TPS65910 Real Time Clock interface
		*
		* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
		* Author: Venu Byravarasu <vbyravarasu@nvidia.com>
		*
		* Based on original TI driver rtc-twl.c
		* Copyright (C) 2007 MontaVista Software, Inc
		* Author: Alexandre Rusev <source@mvista.com>
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License
		* as published by the Free Software Foundation; either version
		* 2 of the License, or (at your option) any later version.
		*/

		#include <linux/kernel.h>
		#include <linux/errno.h>
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/types.h>
		#include <linux/rtc.h>
		#include <linux/bcd.h>
		#include <linux/platform_device.h>
		#include <linux/interrupt.h>
		#include <linux/mfd/tps65910.h>

		struct tps65910_rtc {
		struct rtc_device *rtc;
		/* To store the list of enabled interrupts */
		u32 irqstat;
		};

		/* Total number of RTC registers needed to set time*/
		#define NUM_TIME_REGS (TPS65910_YEARS - TPS65910_SECONDS + 1)

		static int tps65910_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
		{
		struct tps65910 *tps = dev_get_drvdata(dev->parent);
		u8 val = 0;

		if (enabled)
		val = TPS65910_RTC_INTERRUPTS_IT_ALARM;

		return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, val);
		}

		/*
		* Gets current tps65910 RTC time and date parameters.
		*
		* The RTC's time/alarm representation is not what gmtime(3) requires
		* Linux to use:
		*
		* - Months are 1..12 vs Linux 0-11
		* - Years are 0..99 vs Linux 1900..N (we assume 21st century)
		*/
		static int tps65910_rtc_read_time(struct device dev, struct rtc_time tm)
		{
		unsigned char rtc_data[NUM_TIME_REGS];
		struct tps65910 *tps = dev_get_drvdata(dev->parent);
		int ret;

		/* Copy RTC counting registers to static registers or latches */
		ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
		TPS65910_RTC_CTRL_GET_TIME, TPS65910_RTC_CTRL_GET_TIME);
		if (ret < 0) {
		dev_err(dev, "RTC CTRL reg update failed with err:%d\n", ret);
		return ret;
		}

		ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, rtc_data,
		NUM_TIME_REGS);
		if (ret < 0) {
		dev_err(dev, "reading from RTC failed with err:%d\n", ret);
		return ret;
		}

		tm->tm_sec = bcd2bin(rtc_data[0]);
		tm->tm_min = bcd2bin(rtc_data[1]);
		tm->tm_hour = bcd2bin(rtc_data[2]);
		tm->tm_mday = bcd2bin(rtc_data[3]);
		tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
		tm->tm_year = bcd2bin(rtc_data[5]) + 100;

		return ret;
		}

		static int tps65910_rtc_set_time(struct device dev, struct rtc_time tm)
		{
		unsigned char rtc_data[NUM_TIME_REGS];
		struct tps65910 *tps = dev_get_drvdata(dev->parent);
		int ret;

		rtc_data[0] = bin2bcd(tm->tm_sec);
		rtc_data[1] = bin2bcd(tm->tm_min);
		rtc_data[2] = bin2bcd(tm->tm_hour);
		rtc_data[3] = bin2bcd(tm->tm_mday);
		rtc_data[4] = bin2bcd(tm->tm_mon + 1);
		rtc_data[5] = bin2bcd(tm->tm_year - 100);

		/* Stop RTC while updating the RTC time registers */
		ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
		TPS65910_RTC_CTRL_STOP_RTC, 0);
		if (ret < 0) {
		dev_err(dev, "RTC stop failed with err:%d\n", ret);
		return ret;
		}

		/* update all the time registers in one shot */
		ret = regmap_bulk_write(tps->regmap, TPS65910_SECONDS, rtc_data,
		NUM_TIME_REGS);
		if (ret < 0) {
		dev_err(dev, "rtc_set_time error %d\n", ret);
		return ret;
		}

		/* Start back RTC */
		ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
		TPS65910_RTC_CTRL_STOP_RTC, 1);
		if (ret < 0)
		dev_err(dev, "RTC start failed with err:%d\n", ret);

		return ret;
		}

		/*
		* Gets current tps65910 RTC alarm time.
		*/
		static int tps65910_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
		{
		unsigned char alarm_data[NUM_TIME_REGS];
		u32 int_val;
		struct tps65910 *tps = dev_get_drvdata(dev->parent);
		int ret;

		ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, alarm_data,
		NUM_TIME_REGS);
		if (ret < 0) {
		dev_err(dev, "rtc_read_alarm error %d\n", ret);
		return ret;
		}

		alm->time.tm_sec = bcd2bin(alarm_data[0]);
		alm->time.tm_min = bcd2bin(alarm_data[1]);
		alm->time.tm_hour = bcd2bin(alarm_data[2]);
		alm->time.tm_mday = bcd2bin(alarm_data[3]);
		alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1;
		alm->time.tm_year = bcd2bin(alarm_data[5]) + 100;

		ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, &int_val);
		if (ret < 0)
		return ret;

		if (int_val & TPS65910_RTC_INTERRUPTS_IT_ALARM)
		alm->enabled = 1;

		return ret;
		}

		static int tps65910_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
		{
		unsigned char alarm_data[NUM_TIME_REGS];
		struct tps65910 *tps = dev_get_drvdata(dev->parent);
		int ret;

		ret = tps65910_rtc_alarm_irq_enable(dev, 0);
		if (ret)
		return ret;

		alarm_data[0] = bin2bcd(alm->time.tm_sec);
		alarm_data[1] = bin2bcd(alm->time.tm_min);
		alarm_data[2] = bin2bcd(alm->time.tm_hour);
		alarm_data[3] = bin2bcd(alm->time.tm_mday);
		alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
		alarm_data[5] = bin2bcd(alm->time.tm_year - 100);

		/* update all the alarm registers in one shot */
		ret = regmap_bulk_write(tps->regmap, TPS65910_ALARM_SECONDS,
		alarm_data, NUM_TIME_REGS);
		if (ret) {
		dev_err(dev, "rtc_set_alarm error %d\n", ret);
		return ret;
		}

		if (alm->enabled)
		ret = tps65910_rtc_alarm_irq_enable(dev, 1);

		return ret;
		}

		static irqreturn_t tps65910_rtc_interrupt(int irq, void *rtc)
		{
		struct device *dev = rtc;
		unsigned long events = 0;
		struct tps65910 *tps = dev_get_drvdata(dev->parent);
		struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
		int ret;
		u32 rtc_reg;

		ret = regmap_read(tps->regmap, TPS65910_RTC_STATUS, &rtc_reg);
		if (ret)
		return IRQ_NONE;

		if (rtc_reg & TPS65910_RTC_STATUS_ALARM)
		events = RTC_IRQF \| RTC_AF;

		ret = regmap_write(tps->regmap, TPS65910_RTC_STATUS, rtc_reg);
		if (ret)
		return IRQ_NONE;

		/* Notify RTC core on event */
		rtc_update_irq(tps_rtc->rtc, 1, events);

		return IRQ_HANDLED;
		}

		static const struct rtc_class_ops tps65910_rtc_ops = {
		.read_time = tps65910_rtc_read_time,
		.set_time = tps65910_rtc_set_time,
		.read_alarm = tps65910_rtc_read_alarm,
		.set_alarm = tps65910_rtc_set_alarm,
		.alarm_irq_enable = tps65910_rtc_alarm_irq_enable,
		};

		static int __devinit tps65910_rtc_probe(struct platform_device *pdev)
		{
		struct tps65910 *tps65910 = NULL;
		struct tps65910_rtc *tps_rtc = NULL;
		struct tps65910_board *pmic_plat_data;
		int ret;
		int irq;
		u32 rtc_reg;

		tps65910 = dev_get_drvdata(pdev->dev.parent);

		tps_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps65910_rtc),
		GFP_KERNEL);
		if (!tps_rtc)
		return -ENOMEM;

		/* Clear pending interrupts */
		ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg);
		if (ret < 0)
		return ret;

		ret = regmap_write(tps65910->regmap, TPS65910_RTC_STATUS, rtc_reg);
		if (ret < 0)
		return ret;

		dev_dbg(&pdev->dev, "Enabling rtc-tps65910.\n");
		rtc_reg = TPS65910_RTC_CTRL_STOP_RTC;
		ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg);
		if (ret < 0)
		return ret;

		pmic_plat_data = dev_get_platdata(tps65910->dev);
		irq = pmic_plat_data->irq_base;
		if (irq <= 0) {
		dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
		irq);
		return ret;
		}

		irq += TPS65910_IRQ_RTC_ALARM;
		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
		tps65910_rtc_interrupt, IRQF_TRIGGER_LOW,
		"rtc-tps65910", &pdev->dev);
		if (ret < 0) {
		dev_err(&pdev->dev, "IRQ is not free.\n");
		return ret;
		}
		device_init_wakeup(&pdev->dev, 1);

		tps_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
		&tps65910_rtc_ops, THIS_MODULE);
		if (IS_ERR(tps_rtc->rtc)) {
		ret = PTR_ERR(tps_rtc->rtc);
		dev_err(&pdev->dev, "RTC device register: err %d\n", ret);
		return ret;
		}

		platform_set_drvdata(pdev, tps_rtc);

		return 0;
		}

		/*
		* Disable tps65910 RTC interrupts.
		* Sets status flag to free.
		*/
		static int __devexit tps65910_rtc_remove(struct platform_device *pdev)
		{
		/* leave rtc running, but disable irqs */
		struct rtc_device *rtc = platform_get_drvdata(pdev);

		tps65910_rtc_alarm_irq_enable(&rtc->dev, 0);

		rtc_device_unregister(rtc);
		return 0;
		}

		#ifdef CONFIG_PM_SLEEP

		static int tps65910_rtc_suspend(struct device *dev)
		{
		struct tps65910 *tps = dev_get_drvdata(dev->parent);
		u8 alarm = TPS65910_RTC_INTERRUPTS_IT_ALARM;
		int ret;

		/* Store current list of enabled interrupts*/
		ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS,
		&tps->rtc->irqstat);
		if (ret < 0)
		return ret;

		/* Enable RTC ALARM interrupt only */
		return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, alarm);
		}

		static int tps65910_rtc_resume(struct device *dev)
		{
		struct tps65910 *tps = dev_get_drvdata(dev->parent);

		/* Restore list of enabled interrupts before suspend */
		return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS,
		tps->rtc->irqstat);
		}

		static const struct dev_pm_ops tps65910_rtc_pm_ops = {
		.suspend = tps65910_rtc_suspend,
		.resume = tps65910_rtc_resume,
		};

		#define DEV_PM_OPS (&tps65910_rtc_pm_ops)
		#else
		#define DEV_PM_OPS NULL
		#endif

		static struct platform_driver tps65910_rtc_driver = {
		.probe = tps65910_rtc_probe,
		.remove = __devexit_p(tps65910_rtc_remove),
		.driver = {
		.owner = THIS_MODULE,
		.name = "tps65910-rtc",
		.pm = DEV_PM_OPS,
		},
		};

		module_platform_driver(tps65910_rtc_driver);
		MODULE_ALIAS("platform:rtc-tps65910");
		MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
		MODULE_LICENSE("GPL");

include/linux/mfd/tps65910.h

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		@@ -132,6 +132,16 @@
		*
		*/

		/* RTC_CTRL_REG bitfields */
		#define TPS65910_RTC_CTRL_STOP_RTC 0x01 /0=stop, 1=run /
		#define TPS65910_RTC_CTRL_GET_TIME 0x40

		/* RTC_STATUS_REG bitfields */
		#define TPS65910_RTC_STATUS_ALARM 0x40

		/* RTC_INTERRUPTS_REG bitfields */
		#define TPS65910_RTC_INTERRUPTS_EVERY 0x03
		#define TPS65910_RTC_INTERRUPTS_IT_ALARM 0x08

		/Register BCK1 (0x80) register.RegisterDescription /
		#define BCK1_BCKUP_MASK 0xFF

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