rtc: Add MPC5121 Real time clock driver (50aae724) · Commits · 戴 / test

drivers/rtc/Kconfig

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Original line number	Diff line number	Diff line
		@@ -868,4 +868,14 @@ config RTC_DRV_MC13783
		help
		This enables support for the Freescale MC13783 PMIC RTC

		config RTC_DRV_MPC5121
		tristate "Freescale MPC5121 built-in RTC"
		depends on PPC_MPC512x && RTC_CLASS
		help
		If you say yes here you will get support for the
		built-in RTC MPC5121.

		This driver can also be built as a module. If so, the module
		will be called rtc-mpc5121.

		endif # RTC_CLASS

drivers/rtc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -55,6 +55,7 @@ obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o
		obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
		obj-$(CONFIG_RTC_DRV_MC13783) += rtc-mc13783.o
		obj-$(CONFIG_RTC_DRV_MSM6242) += rtc-msm6242.o
		obj-$(CONFIG_RTC_DRV_MPC5121) += rtc-mpc5121.o
		obj-$(CONFIG_RTC_DRV_MV) += rtc-mv.o
		obj-$(CONFIG_RTC_DRV_NUC900) += rtc-nuc900.o
		obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o

drivers/rtc/rtc-mpc5121.c

0 → 100644

+387 −0

Original line number	Diff line number	Diff line
		/*
		* Real-time clock driver for MPC5121
		*
		* Copyright 2007, Domen Puncer <domen.puncer@telargo.com>
		* Copyright 2008, Freescale Semiconductor, Inc. All rights reserved.
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/rtc.h>
		#include <linux/of_device.h>
		#include <linux/of_platform.h>
		#include <linux/io.h>

		struct mpc5121_rtc_regs {
		u8 set_time; /* RTC + 0x00 */
		u8 hour_set; /* RTC + 0x01 */
		u8 minute_set; /* RTC + 0x02 */
		u8 second_set; /* RTC + 0x03 */

		u8 set_date; /* RTC + 0x04 */
		u8 month_set; /* RTC + 0x05 */
		u8 weekday_set; /* RTC + 0x06 */
		u8 date_set; /* RTC + 0x07 */

		u8 write_sw; /* RTC + 0x08 */
		u8 sw_set; /* RTC + 0x09 */
		u16 year_set; /* RTC + 0x0a */

		u8 alm_enable; /* RTC + 0x0c */
		u8 alm_hour_set; /* RTC + 0x0d */
		u8 alm_min_set; /* RTC + 0x0e */
		u8 int_enable; /* RTC + 0x0f */

		u8 reserved1;
		u8 hour; /* RTC + 0x11 */
		u8 minute; /* RTC + 0x12 */
		u8 second; /* RTC + 0x13 */

		u8 month; /* RTC + 0x14 */
		u8 wday_mday; /* RTC + 0x15 */
		u16 year; /* RTC + 0x16 */

		u8 int_alm; /* RTC + 0x18 */
		u8 int_sw; /* RTC + 0x19 */
		u8 alm_status; /* RTC + 0x1a */
		u8 sw_minute; /* RTC + 0x1b */

		u8 bus_error_1; /* RTC + 0x1c */
		u8 int_day; /* RTC + 0x1d */
		u8 int_min; /* RTC + 0x1e */
		u8 int_sec; /* RTC + 0x1f */

		/*
		* target_time:
		* intended to be used for hibernation but hibernation
		* does not work on silicon rev 1.5 so use it for non-volatile
		* storage of offset between the actual_time register and linux
		* time
		*/
		u32 target_time; /* RTC + 0x20 */
		/*
		* actual_time:
		* readonly time since VBAT_RTC was last connected
		*/
		u32 actual_time; /* RTC + 0x24 */
		u32 keep_alive; /* RTC + 0x28 */
		};

		struct mpc5121_rtc_data {
		unsigned irq;
		unsigned irq_periodic;
		struct mpc5121_rtc_regs __iomem *regs;
		struct rtc_device *rtc;
		struct rtc_wkalrm wkalarm;
		};

		/*
		* Update second/minute/hour registers.
		*
		* This is just so alarm will work.
		*/
		static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs,
		struct rtc_time *tm)
		{
		out_8(&regs->second_set, tm->tm_sec);
		out_8(&regs->minute_set, tm->tm_min);
		out_8(&regs->hour_set, tm->tm_hour);

		/* set time sequence */
		out_8(&regs->set_time, 0x1);
		out_8(&regs->set_time, 0x3);
		out_8(&regs->set_time, 0x1);
		out_8(&regs->set_time, 0x0);
		}

		static int mpc5121_rtc_read_time(struct device dev, struct rtc_time tm)
		{
		struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
		struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
		unsigned long now;

		/*
		* linux time is actual_time plus the offset saved in target_time
		*/
		now = in_be32(&regs->actual_time) + in_be32(&regs->target_time);

		rtc_time_to_tm(now, tm);

		/*
		* update second minute hour registers
		* so alarms will work
		*/
		mpc5121_rtc_update_smh(regs, tm);

		return rtc_valid_tm(tm);
		}

		static int mpc5121_rtc_set_time(struct device dev, struct rtc_time tm)
		{
		struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
		struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
		int ret;
		unsigned long now;

		/*
		* The actual_time register is read only so we write the offset
		* between it and linux time to the target_time register.
		*/
		ret = rtc_tm_to_time(tm, &now);
		if (ret == 0)
		out_be32(&regs->target_time, now - in_be32(&regs->actual_time));

		/*
		* update second minute hour registers
		* so alarms will work
		*/
		mpc5121_rtc_update_smh(regs, tm);

		return 0;
		}

		static int mpc5121_rtc_read_alarm(struct device dev, struct rtc_wkalrm alarm)
		{
		struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
		struct mpc5121_rtc_regs __iomem *regs = rtc->regs;

		*alarm = rtc->wkalarm;

		alarm->pending = in_8(&regs->alm_status);

		return 0;
		}

		static int mpc5121_rtc_set_alarm(struct device dev, struct rtc_wkalrm alarm)
		{
		struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
		struct mpc5121_rtc_regs __iomem *regs = rtc->regs;

		/*
		* the alarm has no seconds so deal with it
		*/
		if (alarm->time.tm_sec) {
		alarm->time.tm_sec = 0;
		alarm->time.tm_min++;
		if (alarm->time.tm_min >= 60) {
		alarm->time.tm_min = 0;
		alarm->time.tm_hour++;
		if (alarm->time.tm_hour >= 24)
		alarm->time.tm_hour = 0;
		}
		}

		alarm->time.tm_mday = -1;
		alarm->time.tm_mon = -1;
		alarm->time.tm_year = -1;

		out_8(&regs->alm_min_set, alarm->time.tm_min);
		out_8(&regs->alm_hour_set, alarm->time.tm_hour);

		out_8(&regs->alm_enable, alarm->enabled);

		rtc->wkalarm = *alarm;
		return 0;
		}

		static irqreturn_t mpc5121_rtc_handler(int irq, void *dev)
		{
		struct mpc5121_rtc_data rtc = dev_get_drvdata((struct device )dev);
		struct mpc5121_rtc_regs __iomem *regs = rtc->regs;

		if (in_8(&regs->int_alm)) {
		/* acknowledge and clear status */
		out_8(&regs->int_alm, 1);
		out_8(&regs->alm_status, 1);

		rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_AF);
		return IRQ_HANDLED;
		}

		return IRQ_NONE;
		}

		static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev)
		{
		struct mpc5121_rtc_data rtc = dev_get_drvdata((struct device )dev);
		struct mpc5121_rtc_regs __iomem *regs = rtc->regs;

		if (in_8(&regs->int_sec) && (in_8(&regs->int_enable) & 0x1)) {
		/* acknowledge */
		out_8(&regs->int_sec, 1);

		rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_UF);
		return IRQ_HANDLED;
		}

		return IRQ_NONE;
		}

		static int mpc5121_rtc_alarm_irq_enable(struct device *dev,
		unsigned int enabled)
		{
		struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
		struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
		int val;

		if (enabled)
		val = 1;
		else
		val = 0;

		out_8(&regs->alm_enable, val);
		rtc->wkalarm.enabled = val;

		return 0;
		}

		static int mpc5121_rtc_update_irq_enable(struct device *dev,
		unsigned int enabled)
		{
		struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
		struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
		int val;

		val = in_8(&regs->int_enable);

		if (enabled)
		val = (val & ~0x8) \| 0x1;
		else
		val &= ~0x1;

		out_8(&regs->int_enable, val);

		return 0;
		}

		static const struct rtc_class_ops mpc5121_rtc_ops = {
		.read_time = mpc5121_rtc_read_time,
		.set_time = mpc5121_rtc_set_time,
		.read_alarm = mpc5121_rtc_read_alarm,
		.set_alarm = mpc5121_rtc_set_alarm,
		.alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
		.update_irq_enable = mpc5121_rtc_update_irq_enable,
		};

		static int __devinit mpc5121_rtc_probe(struct of_device *op,
		const struct of_device_id *match)
		{
		struct mpc5121_rtc_data *rtc;
		int err = 0;
		u32 ka;

		rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
		if (!rtc)
		return -ENOMEM;

		rtc->regs = of_iomap(op->node, 0);
		if (!rtc->regs) {
		dev_err(&op->dev, "%s: couldn't map io space\n", __func__);
		err = -ENOSYS;
		goto out_free;
		}

		device_init_wakeup(&op->dev, 1);

		dev_set_drvdata(&op->dev, rtc);

		rtc->irq = irq_of_parse_and_map(op->node, 1);
		err = request_irq(rtc->irq, mpc5121_rtc_handler, IRQF_DISABLED,
		"mpc5121-rtc", &op->dev);
		if (err) {
		dev_err(&op->dev, "%s: could not request irq: %i\n",
		__func__, rtc->irq);
		goto out_dispose;
		}

		rtc->irq_periodic = irq_of_parse_and_map(op->node, 0);
		err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd,
		IRQF_DISABLED, "mpc5121-rtc_upd", &op->dev);
		if (err) {
		dev_err(&op->dev, "%s: could not request irq: %i\n",
		__func__, rtc->irq_periodic);
		goto out_dispose2;
		}

		ka = in_be32(&rtc->regs->keep_alive);
		if (ka & 0x02) {
		dev_warn(&op->dev,
		"mpc5121-rtc: Battery or oscillator failure!\n");
		out_be32(&rtc->regs->keep_alive, ka);
		}

		rtc->rtc = rtc_device_register("mpc5121-rtc", &op->dev,
		&mpc5121_rtc_ops, THIS_MODULE);
		if (IS_ERR(rtc->rtc)) {
		err = PTR_ERR(rtc->rtc);
		goto out_free_irq;
		}

		return 0;

		out_free_irq:
		free_irq(rtc->irq_periodic, &op->dev);
		out_dispose2:
		irq_dispose_mapping(rtc->irq_periodic);
		free_irq(rtc->irq, &op->dev);
		out_dispose:
		irq_dispose_mapping(rtc->irq);
		iounmap(rtc->regs);
		out_free:
		kfree(rtc);

		return err;
		}

		static int __devexit mpc5121_rtc_remove(struct of_device *op)
		{
		struct mpc5121_rtc_data *rtc = dev_get_drvdata(&op->dev);
		struct mpc5121_rtc_regs __iomem *regs = rtc->regs;

		/* disable interrupt, so there are no nasty surprises */
		out_8(&regs->alm_enable, 0);
		out_8(&regs->int_enable, in_8(&regs->int_enable) & ~0x1);

		rtc_device_unregister(rtc->rtc);
		iounmap(rtc->regs);
		free_irq(rtc->irq, &op->dev);
		free_irq(rtc->irq_periodic, &op->dev);
		irq_dispose_mapping(rtc->irq);
		irq_dispose_mapping(rtc->irq_periodic);
		dev_set_drvdata(&op->dev, NULL);
		kfree(rtc);

		return 0;
		}

		static struct of_device_id mpc5121_rtc_match[] __devinitdata = {
		{ .compatible = "fsl,mpc5121-rtc", },
		{},
		};

		static struct of_platform_driver mpc5121_rtc_driver = {
		.owner = THIS_MODULE,
		.name = "mpc5121-rtc",
		.match_table = mpc5121_rtc_match,
		.probe = mpc5121_rtc_probe,
		.remove = __devexit_p(mpc5121_rtc_remove),
		};

		static int __init mpc5121_rtc_init(void)
		{
		return of_register_platform_driver(&mpc5121_rtc_driver);
		}
		module_init(mpc5121_rtc_init);

		static void __exit mpc5121_rtc_exit(void)
		{
		of_unregister_platform_driver(&mpc5121_rtc_driver);
		}
		module_exit(mpc5121_rtc_exit);

		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>");

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