ARM: 5914/1: Modify PL031 for Nomadik and U8500 v2 (c72881e8) · Commits · 戴 / test

drivers/rtc/rtc-pl031.c

+327 −38

Original line number	Diff line number	Diff line
		@@ -7,6 +7,9 @@
		*
		* Copyright 2006 (c) MontaVista Software, Inc.
		*
		* Author: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
		* Copyright 2010 (c) ST-Ericsson AB
		*
		* 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
		@@ -18,6 +21,9 @@
		#include <linux/interrupt.h>
		#include <linux/amba/bus.h>
		#include <linux/io.h>
		#include <linux/bcd.h>
		#include <linux/delay.h>
		#include <linux/version.h>

		/*
		* Register definitions
		@@ -30,35 +36,207 @@
		#define RTC_RIS 0x14 /* Raw interrupt status register */
		#define RTC_MIS 0x18 /* Masked interrupt status register */
		#define RTC_ICR 0x1c /* Interrupt clear register */
		/* ST variants have additional timer functionality */
		#define RTC_TDR 0x20 /* Timer data read register */
		#define RTC_TLR 0x24 /* Timer data load register */
		#define RTC_TCR 0x28 /* Timer control register */
		#define RTC_YDR 0x30 /* Year data read register */
		#define RTC_YMR 0x34 /* Year match register */
		#define RTC_YLR 0x38 /* Year data load register */

		#define RTC_CR_CWEN (1 << 26) /* Clockwatch enable bit */

		#define RTC_TCR_EN (1 << 1) /* Periodic timer enable bit */

		/* Common bit definitions for Interrupt status and control registers */
		#define RTC_BIT_AI (1 << 0) /* Alarm interrupt bit */
		#define RTC_BIT_PI (1 << 1) /* Periodic interrupt bit. ST variants only. */

		/* Common bit definations for ST v2 for reading/writing time */
		#define RTC_SEC_SHIFT 0
		#define RTC_SEC_MASK (0x3F << RTC_SEC_SHIFT) /* Second [0-59] */
		#define RTC_MIN_SHIFT 6
		#define RTC_MIN_MASK (0x3F << RTC_MIN_SHIFT) /* Minute [0-59] */
		#define RTC_HOUR_SHIFT 12
		#define RTC_HOUR_MASK (0x1F << RTC_HOUR_SHIFT) /* Hour [0-23] */
		#define RTC_WDAY_SHIFT 17
		#define RTC_WDAY_MASK (0x7 << RTC_WDAY_SHIFT) /* Day of Week [1-7] 1=Sunday */
		#define RTC_MDAY_SHIFT 20
		#define RTC_MDAY_MASK (0x1F << RTC_MDAY_SHIFT) /* Day of Month [1-31] */
		#define RTC_MON_SHIFT 25
		#define RTC_MON_MASK (0xF << RTC_MON_SHIFT) /* Month [1-12] 1=January */

		#define RTC_TIMER_FREQ 32768

		struct pl031_local {
		struct rtc_device *rtc;
		void __iomem *base;
		u8 hw_designer;
		u8 hw_revision:4;
		};

		static irqreturn_t pl031_interrupt(int irq, void *dev_id)
		static int pl031_alarm_irq_enable(struct device *dev,
		unsigned int enabled)
		{
		struct rtc_device *rtc = dev_id;
		struct pl031_local *ldata = dev_get_drvdata(dev);
		unsigned long imsc;

		rtc_update_irq(rtc, 1, RTC_AF);
		/* Clear any pending alarm interrupts. */
		writel(RTC_BIT_AI, ldata->base + RTC_ICR);

		return IRQ_HANDLED;
		imsc = readl(ldata->base + RTC_IMSC);

		if (enabled == 1)
		writel(imsc \| RTC_BIT_AI, ldata->base + RTC_IMSC);
		else
		writel(imsc & ~RTC_BIT_AI, ldata->base + RTC_IMSC);

		return 0;
		}

		static int pl031_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
		/*
		* Convert Gregorian date to ST v2 RTC format.
		*/
		static int pl031_stv2_tm_to_time(struct device *dev,
		struct rtc_time tm, unsigned long st_time,
		unsigned long *bcd_year)
		{
		struct pl031_local *ldata = dev_get_drvdata(dev);
		int year = tm->tm_year + 1900;
		int wday = tm->tm_wday;

		/* wday masking is not working in hardware so wday must be valid */
		if (wday < -1 \|\| wday > 6) {
		dev_err(dev, "invalid wday value %d\n", tm->tm_wday);
		return -EINVAL;
		} else if (wday == -1) {
		/* wday is not provided, calculate it here */
		unsigned long time;
		struct rtc_time calc_tm;

		rtc_tm_to_time(tm, &time);
		rtc_time_to_tm(time, &calc_tm);
		wday = calc_tm.tm_wday;
		}

		*bcd_year = (bin2bcd(year % 100) \| bin2bcd(year / 100) << 8);

		*st_time = ((tm->tm_mon + 1) << RTC_MON_SHIFT)
		\| (tm->tm_mday << RTC_MDAY_SHIFT)
		\| ((wday + 1) << RTC_WDAY_SHIFT)
		\| (tm->tm_hour << RTC_HOUR_SHIFT)
		\| (tm->tm_min << RTC_MIN_SHIFT)
		\| (tm->tm_sec << RTC_SEC_SHIFT);

		return 0;
		}

		/*
		* Convert ST v2 RTC format to Gregorian date.
		*/
		static int pl031_stv2_time_to_tm(unsigned long st_time, unsigned long bcd_year,
		struct rtc_time *tm)
		{
		tm->tm_year = bcd2bin(bcd_year) + (bcd2bin(bcd_year >> 8) * 100);
		tm->tm_mon = ((st_time & RTC_MON_MASK) >> RTC_MON_SHIFT) - 1;
		tm->tm_mday = ((st_time & RTC_MDAY_MASK) >> RTC_MDAY_SHIFT);
		tm->tm_wday = ((st_time & RTC_WDAY_MASK) >> RTC_WDAY_SHIFT) - 1;
		tm->tm_hour = ((st_time & RTC_HOUR_MASK) >> RTC_HOUR_SHIFT);
		tm->tm_min = ((st_time & RTC_MIN_MASK) >> RTC_MIN_SHIFT);
		tm->tm_sec = ((st_time & RTC_SEC_MASK) >> RTC_SEC_SHIFT);

		tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
		tm->tm_year -= 1900;

		switch (cmd) {
		case RTC_AIE_OFF:
		writel(1, ldata->base + RTC_MIS);
		return 0;
		case RTC_AIE_ON:
		writel(0, ldata->base + RTC_MIS);
		}

		static int pl031_stv2_read_time(struct device dev, struct rtc_time tm)
		{
		struct pl031_local *ldata = dev_get_drvdata(dev);

		pl031_stv2_time_to_tm(readl(ldata->base + RTC_DR),
		readl(ldata->base + RTC_YDR), tm);

		return 0;
		}

		return -ENOIOCTLCMD;
		static int pl031_stv2_set_time(struct device dev, struct rtc_time tm)
		{
		unsigned long time;
		unsigned long bcd_year;
		struct pl031_local *ldata = dev_get_drvdata(dev);
		int ret;

		ret = pl031_stv2_tm_to_time(dev, tm, &time, &bcd_year);
		if (ret == 0) {
		writel(bcd_year, ldata->base + RTC_YLR);
		writel(time, ldata->base + RTC_LR);
		}

		return ret;
		}

		static int pl031_stv2_read_alarm(struct device dev, struct rtc_wkalrm alarm)
		{
		struct pl031_local *ldata = dev_get_drvdata(dev);
		int ret;

		ret = pl031_stv2_time_to_tm(readl(ldata->base + RTC_MR),
		readl(ldata->base + RTC_YMR), &alarm->time);

		alarm->pending = readl(ldata->base + RTC_RIS) & RTC_BIT_AI;
		alarm->enabled = readl(ldata->base + RTC_IMSC) & RTC_BIT_AI;

		return ret;
		}

		static int pl031_stv2_set_alarm(struct device dev, struct rtc_wkalrm alarm)
		{
		struct pl031_local *ldata = dev_get_drvdata(dev);
		unsigned long time;
		unsigned long bcd_year;
		int ret;

		/* At the moment, we can only deal with non-wildcarded alarm times. */
		ret = rtc_valid_tm(&alarm->time);
		if (ret == 0) {
		ret = pl031_stv2_tm_to_time(dev, &alarm->time,
		&time, &bcd_year);
		if (ret == 0) {
		writel(bcd_year, ldata->base + RTC_YMR);
		writel(time, ldata->base + RTC_MR);

		pl031_alarm_irq_enable(dev, alarm->enabled);
		}
		}

		return ret;
		}

		static irqreturn_t pl031_interrupt(int irq, void *dev_id)
		{
		struct pl031_local *ldata = dev_id;
		unsigned long rtcmis;
		unsigned long events = 0;

		rtcmis = readl(ldata->base + RTC_MIS);
		if (rtcmis) {
		writel(rtcmis, ldata->base + RTC_ICR);

		if (rtcmis & RTC_BIT_AI)
		events \|= (RTC_AF \| RTC_IRQF);

		/* Timer interrupt is only available in ST variants */
		if ((rtcmis & RTC_BIT_PI) &&
		(ldata->hw_designer == AMBA_VENDOR_ST))
		events \|= (RTC_PF \| RTC_IRQF);

		rtc_update_irq(ldata->rtc, 1, events);

		return IRQ_HANDLED;
		}

		return IRQ_NONE;
		}

		static int pl031_read_time(struct device dev, struct rtc_time tm)
		@@ -74,11 +252,14 @@ static int pl031_set_time(struct device dev, struct rtc_time tm)
		{
		unsigned long time;
		struct pl031_local *ldata = dev_get_drvdata(dev);
		int ret;

		rtc_tm_to_time(tm, &time);
		ret = rtc_tm_to_time(tm, &time);

		if (ret == 0)
		writel(time, ldata->base + RTC_LR);

		return 0;
		return ret;
		}

		static int pl031_read_alarm(struct device dev, struct rtc_wkalrm alarm)
		@@ -86,8 +267,9 @@ static int pl031_read_alarm(struct device dev, struct rtc_wkalrm alarm)
		struct pl031_local *ldata = dev_get_drvdata(dev);

		rtc_time_to_tm(readl(ldata->base + RTC_MR), &alarm->time);
		alarm->pending = readl(ldata->base + RTC_RIS);
		alarm->enabled = readl(ldata->base + RTC_IMSC);

		alarm->pending = readl(ldata->base + RTC_RIS) & RTC_BIT_AI;
		alarm->enabled = readl(ldata->base + RTC_IMSC) & RTC_BIT_AI;

		return 0;
		}
		@@ -96,22 +278,71 @@ static int pl031_set_alarm(struct device dev, struct rtc_wkalrm alarm)
		{
		struct pl031_local *ldata = dev_get_drvdata(dev);
		unsigned long time;
		int ret;

		rtc_tm_to_time(&alarm->time, &time);

		/* At the moment, we can only deal with non-wildcarded alarm times. */
		ret = rtc_valid_tm(&alarm->time);
		if (ret == 0) {
		ret = rtc_tm_to_time(&alarm->time, &time);
		if (ret == 0) {
		writel(time, ldata->base + RTC_MR);
		writel(!alarm->enabled, ldata->base + RTC_MIS);
		pl031_alarm_irq_enable(dev, alarm->enabled);
		}
		}

		return ret;
		}

		/* Periodic interrupt is only available in ST variants. */
		static int pl031_irq_set_state(struct device *dev, int enabled)
		{
		struct pl031_local *ldata = dev_get_drvdata(dev);

		if (enabled == 1) {
		/* Clear any pending timer interrupt. */
		writel(RTC_BIT_PI, ldata->base + RTC_ICR);

		writel(readl(ldata->base + RTC_IMSC) \| RTC_BIT_PI,
		ldata->base + RTC_IMSC);

		/* Now start the timer */
		writel(readl(ldata->base + RTC_TCR) \| RTC_TCR_EN,
		ldata->base + RTC_TCR);

		} else {
		writel(readl(ldata->base + RTC_IMSC) & (~RTC_BIT_PI),
		ldata->base + RTC_IMSC);

		/* Also stop the timer */
		writel(readl(ldata->base + RTC_TCR) & (~RTC_TCR_EN),
		ldata->base + RTC_TCR);
		}
		/* Wait at least 1 RTC32 clock cycle to ensure next access
		* to RTC_TCR will succeed.
		*/
		udelay(40);

		return 0;
		}

		static const struct rtc_class_ops pl031_ops = {
		.ioctl = pl031_ioctl,
		.read_time = pl031_read_time,
		.set_time = pl031_set_time,
		.read_alarm = pl031_read_alarm,
		.set_alarm = pl031_set_alarm,
		};
		static int pl031_irq_set_freq(struct device *dev, int freq)
		{
		struct pl031_local *ldata = dev_get_drvdata(dev);

		/* Cant set timer if it is already enabled */
		if (readl(ldata->base + RTC_TCR) & RTC_TCR_EN) {
		dev_err(dev, "can't change frequency while timer enabled\n");
		return -EINVAL;
		}

		/* If self start bit in RTC_TCR is set timer will start here,
		* but we never set that bit. Instead we start the timer when
		* set_state is called with enabled == 1.
		*/
		writel(RTC_TIMER_FREQ / freq, ldata->base + RTC_TLR);

		return 0;
		}

		static int pl031_remove(struct amba_device *adev)
		{
		@@ -131,18 +362,20 @@ static int pl031_probe(struct amba_device adev, struct amba_id id)
		{
		int ret;
		struct pl031_local *ldata;
		struct rtc_class_ops *ops = id->data;

		ret = amba_request_regions(adev, NULL);
		if (ret)
		goto err_req;

		ldata = kmalloc(sizeof(struct pl031_local), GFP_KERNEL);
		ldata = kzalloc(sizeof(struct pl031_local), GFP_KERNEL);
		if (!ldata) {
		ret = -ENOMEM;
		goto out;
		}

		ldata->base = ioremap(adev->res.start, resource_size(&adev->res));

		if (!ldata->base) {
		ret = -ENOMEM;
		goto out_no_remap;
		@@ -150,24 +383,36 @@ static int pl031_probe(struct amba_device adev, struct amba_id id)

		amba_set_drvdata(adev, ldata);

		if (request_irq(adev->irq[0], pl031_interrupt, IRQF_DISABLED,
		"rtc-pl031", ldata->rtc)) {
		ret = -EIO;
		goto out_no_irq;
		}
		ldata->hw_designer = amba_manf(adev);
		ldata->hw_revision = amba_rev(adev);

		dev_dbg(&adev->dev, "designer ID = 0x%02x\n", ldata->hw_designer);
		dev_dbg(&adev->dev, "revision = 0x%01x\n", ldata->hw_revision);

		ldata->rtc = rtc_device_register("pl031", &adev->dev, &pl031_ops,
		/* Enable the clockwatch on ST Variants */
		if ((ldata->hw_designer == AMBA_VENDOR_ST) &&
		(ldata->hw_revision > 1))
		writel(readl(ldata->base + RTC_CR) \| RTC_CR_CWEN,
		ldata->base + RTC_CR);

		ldata->rtc = rtc_device_register("pl031", &adev->dev, ops,
		THIS_MODULE);
		if (IS_ERR(ldata->rtc)) {
		ret = PTR_ERR(ldata->rtc);
		goto out_no_rtc;
		}

		if (request_irq(adev->irq[0], pl031_interrupt,
		IRQF_DISABLED \| IRQF_SHARED, "rtc-pl031", ldata)) {
		ret = -EIO;
		goto out_no_irq;
		}

		return 0;

		out_no_rtc:
		free_irq(adev->irq[0], ldata->rtc);
		out_no_irq:
		rtc_device_unregister(ldata->rtc);
		out_no_rtc:
		iounmap(ldata->base);
		amba_set_drvdata(adev, NULL);
		out_no_remap:
		@@ -175,13 +420,57 @@ out_no_remap:
		out:
		amba_release_regions(adev);
		err_req:

		return ret;
		}

		/* Operations for the original ARM version */
		static struct rtc_class_ops arm_pl031_ops = {
		.read_time = pl031_read_time,
		.set_time = pl031_set_time,
		.read_alarm = pl031_read_alarm,
		.set_alarm = pl031_set_alarm,
		.alarm_irq_enable = pl031_alarm_irq_enable,
		};

		/* The First ST derivative */
		static struct rtc_class_ops stv1_pl031_ops = {
		.read_time = pl031_read_time,
		.set_time = pl031_set_time,
		.read_alarm = pl031_read_alarm,
		.set_alarm = pl031_set_alarm,
		.alarm_irq_enable = pl031_alarm_irq_enable,
		.irq_set_state = pl031_irq_set_state,
		.irq_set_freq = pl031_irq_set_freq,
		};

		/* And the second ST derivative */
		static struct rtc_class_ops stv2_pl031_ops = {
		.read_time = pl031_stv2_read_time,
		.set_time = pl031_stv2_set_time,
		.read_alarm = pl031_stv2_read_alarm,
		.set_alarm = pl031_stv2_set_alarm,
		.alarm_irq_enable = pl031_alarm_irq_enable,
		.irq_set_state = pl031_irq_set_state,
		.irq_set_freq = pl031_irq_set_freq,
		};

		static struct amba_id pl031_ids[] __initdata = {
		{
		.id = 0x00041031,
		.mask = 0x000fffff,
		.data = &arm_pl031_ops,
		},
		/* ST Micro variants */
		{
		.id = 0x00180031,
		.mask = 0x00ffffff,
		.data = &stv1_pl031_ops,
		},
		{
		.id = 0x00280031,
		.mask = 0x00ffffff,
		.data = &stv2_pl031_ops,
		},
		{0, 0},
		};

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