rtc: Add MPC5121 Real time clock driver (50aae724) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/rtc/Kconfig

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

drivers/rtc/Makefile

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Original line number	Original line	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-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
	obj-$(CONFIG_RTC_DRV_MC13783) += rtc-mc13783.o		obj-$(CONFIG_RTC_DRV_MC13783) += rtc-mc13783.o
	obj-$(CONFIG_RTC_DRV_MSM6242) += rtc-msm6242.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_MV) += rtc-mv.o
	obj-$(CONFIG_RTC_DRV_NUC900) += rtc-nuc900.o		obj-$(CONFIG_RTC_DRV_NUC900) += rtc-nuc900.o
	obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o		obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o

drivers/rtc/rtc-mpc5121.c

0 → 100644

+387 −0

Original line number	Original line	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>");