RTC: RK808: add RTC driver for RK808 (3ca1e326) · Commits · 戴 / test

drivers/rtc/Kconfig

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Original line number	Diff line number	Diff line
		@@ -288,6 +288,16 @@ config RTC_DRV_MAX77686
		This driver can also be built as a module. If so, the module
		will be called rtc-max77686.

		config RTC_DRV_RK808
		tristate "Rockchip RK808 RTC"
		depends on MFD_RK808
		help
		If you say yes here you will get support for the
		RTC of RK808 PMIC.

		This driver can also be built as a module. If so, the module
		will be called rk808-rtc.

		config RTC_DRV_RS5C372
		tristate "Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A"
		help

drivers/rtc/Makefile

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Original line number	Diff line number	Diff line
		@@ -109,6 +109,7 @@ obj-$(CONFIG_RTC_DRV_PUV3) += rtc-puv3.o
		obj-$(CONFIG_RTC_DRV_PXA) += rtc-pxa.o
		obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701.o
		obj-$(CONFIG_RTC_DRV_RC5T583) += rtc-rc5t583.o
		obj-$(CONFIG_RTC_DRV_RK808) += rtc-rk808.o
		obj-$(CONFIG_RTC_DRV_RP5C01) += rtc-rp5c01.o
		obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
		obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o

drivers/rtc/rtc-rk808.c

0 → 100644

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Original line number	Diff line number	Diff line
		/*
		* RTC driver for Rockchip RK808
		*
		* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
		*
		* Author: Chris Zhong <zyw@rock-chips.com>
		* Author: Zhang Qing <zhangqing@rock-chips.com>
		*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms and conditions of the GNU General Public License,
		* version 2, as published by the Free Software Foundation.
		*
		* This program is distributed in the hope 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.
		*/

		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/rtc.h>
		#include <linux/bcd.h>
		#include <linux/mfd/rk808.h>
		#include <linux/platform_device.h>
		#include <linux/i2c.h>

		/* RTC_CTRL_REG bitfields */
		#define BIT_RTC_CTRL_REG_STOP_RTC_M BIT(0)

		/* RK808 has a shadowed register for saving a "frozen" RTC time.
		* When user setting "GET_TIME" to 1, the time will save in this shadowed
		* register. If set "READSEL" to 1, user read rtc time register, actually
		* get the time of that moment. If we need the real time, clr this bit.
		*/
		#define BIT_RTC_CTRL_REG_RTC_GET_TIME BIT(6)
		#define BIT_RTC_CTRL_REG_RTC_READSEL_M BIT(7)
		#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M BIT(3)
		#define RTC_STATUS_MASK 0xFE

		#define SECONDS_REG_MSK 0x7F
		#define MINUTES_REG_MAK 0x7F
		#define HOURS_REG_MSK 0x3F
		#define DAYS_REG_MSK 0x3F
		#define MONTHS_REG_MSK 0x1F
		#define YEARS_REG_MSK 0xFF
		#define WEEKS_REG_MSK 0x7

		/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */

		#define NUM_TIME_REGS (RK808_WEEKS_REG - RK808_SECONDS_REG + 1)
		#define NUM_ALARM_REGS (RK808_ALARM_YEARS_REG - RK808_ALARM_SECONDS_REG + 1)

		struct rk808_rtc {
		struct rk808 *rk808;
		struct rtc_device *rtc;
		int irq;
		};

		/* Read current time and date in RTC */
		static int rk808_rtc_readtime(struct device dev, struct rtc_time tm)
		{
		struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
		struct rk808 *rk808 = rk808_rtc->rk808;
		u8 rtc_data[NUM_TIME_REGS];
		int ret;

		/* Force an update of the shadowed registers right now */
		ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
		BIT_RTC_CTRL_REG_RTC_GET_TIME,
		0);
		if (ret) {
		dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret);
		return ret;
		}

		ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
		BIT_RTC_CTRL_REG_RTC_GET_TIME,
		BIT_RTC_CTRL_REG_RTC_GET_TIME);
		if (ret) {
		dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret);
		return ret;
		}

		ret = regmap_bulk_read(rk808->regmap, RK808_SECONDS_REG,
		rtc_data, NUM_TIME_REGS);
		if (ret) {
		dev_err(dev, "Failed to bulk read rtc_data: %d\n", ret);
		return ret;
		}

		tm->tm_sec = bcd2bin(rtc_data[0] & SECONDS_REG_MSK);
		tm->tm_min = bcd2bin(rtc_data[1] & MINUTES_REG_MAK);
		tm->tm_hour = bcd2bin(rtc_data[2] & HOURS_REG_MSK);
		tm->tm_mday = bcd2bin(rtc_data[3] & DAYS_REG_MSK);
		tm->tm_mon = (bcd2bin(rtc_data[4] & MONTHS_REG_MSK)) - 1;
		tm->tm_year = (bcd2bin(rtc_data[5] & YEARS_REG_MSK)) + 100;
		tm->tm_wday = bcd2bin(rtc_data[6] & WEEKS_REG_MSK);
		dev_dbg(dev, "RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
		1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
		tm->tm_wday, tm->tm_hour , tm->tm_min, tm->tm_sec);

		return ret;
		}

		/* Set current time and date in RTC */
		static int rk808_rtc_set_time(struct device dev, struct rtc_time tm)
		{
		struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
		struct rk808 *rk808 = rk808_rtc->rk808;
		u8 rtc_data[NUM_TIME_REGS];
		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);
		rtc_data[6] = bin2bcd(tm->tm_wday);
		dev_dbg(dev, "set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
		1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
		tm->tm_wday, tm->tm_hour , tm->tm_min, tm->tm_sec);

		/* Stop RTC while updating the RTC registers */
		ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
		BIT_RTC_CTRL_REG_STOP_RTC_M,
		BIT_RTC_CTRL_REG_STOP_RTC_M);
		if (ret) {
		dev_err(dev, "Failed to update RTC control: %d\n", ret);
		return ret;
		}

		ret = regmap_bulk_write(rk808->regmap, RK808_SECONDS_REG,
		rtc_data, NUM_TIME_REGS);
		if (ret) {
		dev_err(dev, "Failed to bull write rtc_data: %d\n", ret);
		return ret;
		}
		/* Start RTC again */
		ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
		BIT_RTC_CTRL_REG_STOP_RTC_M, 0);
		if (ret) {
		dev_err(dev, "Failed to update RTC control: %d\n", ret);
		return ret;
		}
		return 0;
		}

		/* Read alarm time and date in RTC */
		static int rk808_rtc_readalarm(struct device dev, struct rtc_wkalrm alrm)
		{
		struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
		struct rk808 *rk808 = rk808_rtc->rk808;
		u8 alrm_data[NUM_ALARM_REGS];
		uint32_t int_reg;
		int ret;

		ret = regmap_bulk_read(rk808->regmap, RK808_ALARM_SECONDS_REG,
		alrm_data, NUM_ALARM_REGS);

		alrm->time.tm_sec = bcd2bin(alrm_data[0] & SECONDS_REG_MSK);
		alrm->time.tm_min = bcd2bin(alrm_data[1] & MINUTES_REG_MAK);
		alrm->time.tm_hour = bcd2bin(alrm_data[2] & HOURS_REG_MSK);
		alrm->time.tm_mday = bcd2bin(alrm_data[3] & DAYS_REG_MSK);
		alrm->time.tm_mon = (bcd2bin(alrm_data[4] & MONTHS_REG_MSK)) - 1;
		alrm->time.tm_year = (bcd2bin(alrm_data[5] & YEARS_REG_MSK)) + 100;

		ret = regmap_read(rk808->regmap, RK808_RTC_INT_REG, &int_reg);
		if (ret) {
		dev_err(dev, "Failed to read RTC INT REG: %d\n", ret);
		return ret;
		}

		dev_dbg(dev, "alrm read RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
		1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
		alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
		alrm->time.tm_min, alrm->time.tm_sec);

		alrm->enabled = (int_reg & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M) ? 1 : 0;

		return 0;
		}

		static int rk808_rtc_stop_alarm(struct rk808_rtc *rk808_rtc)
		{
		struct rk808 *rk808 = rk808_rtc->rk808;
		int ret;

		ret = regmap_update_bits(rk808->regmap, RK808_RTC_INT_REG,
		BIT_RTC_INTERRUPTS_REG_IT_ALARM_M, 0);

		return ret;
		}

		static int rk808_rtc_start_alarm(struct rk808_rtc *rk808_rtc)
		{
		struct rk808 *rk808 = rk808_rtc->rk808;
		int ret;

		ret = regmap_update_bits(rk808->regmap, RK808_RTC_INT_REG,
		BIT_RTC_INTERRUPTS_REG_IT_ALARM_M,
		BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);

		return ret;
		}

		static int rk808_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
		{
		struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
		struct rk808 *rk808 = rk808_rtc->rk808;
		u8 alrm_data[NUM_ALARM_REGS];
		int ret;

		ret = rk808_rtc_stop_alarm(rk808_rtc);
		if (ret) {
		dev_err(dev, "Failed to stop alarm: %d\n", ret);
		return ret;
		}
		dev_dbg(dev, "alrm set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
		1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
		alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
		alrm->time.tm_min, alrm->time.tm_sec);

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

		ret = regmap_bulk_write(rk808->regmap, RK808_ALARM_SECONDS_REG,
		alrm_data, NUM_ALARM_REGS);
		if (ret) {
		dev_err(dev, "Failed to bulk write: %d\n", ret);
		return ret;
		}
		if (alrm->enabled) {
		ret = rk808_rtc_start_alarm(rk808_rtc);
		if (ret) {
		dev_err(dev, "Failed to start alarm: %d\n", ret);
		return ret;
		}
		}
		return 0;
		}

		static int rk808_rtc_alarm_irq_enable(struct device *dev,
		unsigned int enabled)
		{
		struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);

		if (enabled)
		return rk808_rtc_start_alarm(rk808_rtc);

		return rk808_rtc_stop_alarm(rk808_rtc);
		}

		/*
		* We will just handle setting the frequency and make use the framework for
		* reading the periodic interupts.
		*
		* @freq: Current periodic IRQ freq:
		* bit 0: every second
		* bit 1: every minute
		* bit 2: every hour
		* bit 3: every day
		*/
		static irqreturn_t rk808_alarm_irq(int irq, void *data)
		{
		struct rk808_rtc *rk808_rtc = data;
		struct rk808 *rk808 = rk808_rtc->rk808;
		struct i2c_client *client = rk808->i2c;
		int ret;

		ret = regmap_write(rk808->regmap, RK808_RTC_STATUS_REG,
		RTC_STATUS_MASK);
		if (ret) {
		dev_err(&client->dev,
		"%s:Failed to update RTC status: %d\n", __func__, ret);
		return ret;
		}

		rtc_update_irq(rk808_rtc->rtc, 1, RTC_IRQF \| RTC_AF);
		dev_dbg(&client->dev,
		"%s:irq=%d\n", __func__, irq);
		return IRQ_HANDLED;
		}

		static const struct rtc_class_ops rk808_rtc_ops = {
		.read_time = rk808_rtc_readtime,
		.set_time = rk808_rtc_set_time,
		.read_alarm = rk808_rtc_readalarm,
		.set_alarm = rk808_rtc_setalarm,
		.alarm_irq_enable = rk808_rtc_alarm_irq_enable,
		};

		#ifdef CONFIG_PM_SLEEP
		/* Turn off the alarm if it should not be a wake source. */
		static int rk808_rtc_suspend(struct device *dev)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->dev);

		if (device_may_wakeup(dev))
		enable_irq_wake(rk808_rtc->irq);

		return 0;
		}

		/* Enable the alarm if it should be enabled (in case it was disabled to
		* prevent use as a wake source).
		*/
		static int rk808_rtc_resume(struct device *dev)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->dev);

		if (device_may_wakeup(dev))
		disable_irq_wake(rk808_rtc->irq);

		return 0;
		}
		#endif

		static SIMPLE_DEV_PM_OPS(rk808_rtc_pm_ops,
		rk808_rtc_suspend, rk808_rtc_resume);

		static int rk808_rtc_probe(struct platform_device *pdev)
		{
		struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
		struct rk808_rtc *rk808_rtc;
		struct rtc_time tm;
		int ret;

		rk808_rtc = devm_kzalloc(&pdev->dev, sizeof(*rk808_rtc), GFP_KERNEL);
		if (rk808_rtc == NULL)
		return -ENOMEM;

		platform_set_drvdata(pdev, rk808_rtc);
		rk808_rtc->rk808 = rk808;

		/* start rtc running by default, and use shadowed timer. */
		ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
		BIT_RTC_CTRL_REG_STOP_RTC_M \|
		BIT_RTC_CTRL_REG_RTC_READSEL_M,
		BIT_RTC_CTRL_REG_RTC_READSEL_M);
		if (ret) {
		dev_err(&pdev->dev,
		"Failed to update RTC control: %d\n", ret);
		return ret;
		}

		ret = regmap_write(rk808->regmap, RK808_RTC_STATUS_REG,
		RTC_STATUS_MASK);
		if (ret) {
		dev_err(&pdev->dev,
		"Failed to write RTC status: %d\n", ret);
		return ret;
		}

		/* set init time */
		ret = rk808_rtc_readtime(&pdev->dev, &tm);
		if (ret) {
		dev_err(&pdev->dev, "Failed to read RTC time\n");
		return ret;
		}
		ret = rtc_valid_tm(&tm);
		if (ret)
		dev_warn(&pdev->dev, "invalid date/time\n");

		device_init_wakeup(&pdev->dev, 1);

		rk808_rtc->rtc = devm_rtc_device_register(&pdev->dev, "rk808-rtc",
		&rk808_rtc_ops, THIS_MODULE);
		if (IS_ERR(rk808_rtc->rtc)) {
		ret = PTR_ERR(rk808_rtc->rtc);
		return ret;
		}

		rk808_rtc->irq = platform_get_irq(pdev, 0);
		if (rk808_rtc->irq < 0) {
		if (rk808_rtc->irq != -EPROBE_DEFER)
		dev_err(&pdev->dev, "Wake up is not possible as irq = %d\n",
		rk808_rtc->irq);
		return rk808_rtc->irq;
		}

		/* request alarm irq of rk808 */
		ret = devm_request_threaded_irq(&pdev->dev, rk808_rtc->irq, NULL,
		rk808_alarm_irq, 0,
		"RTC alarm", rk808_rtc);
		if (ret) {
		dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
		rk808_rtc->irq, ret);
		}

		return ret;
		}

		static struct platform_driver rk808_rtc_driver = {
		.probe = rk808_rtc_probe,
		.driver = {
		.name = "rk808-rtc",
		.pm = &rk808_rtc_pm_ops,
		},
		};

		module_platform_driver(rk808_rtc_driver);

		MODULE_DESCRIPTION("RTC driver for the rk808 series PMICs");
		MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
		MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:rk808-rtc");

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