unicore32 core architecture: timer and time handling (02b2ee16) · Commits · e / devices / android_kernel_xiaomi_markw

arch/unicore32/include/asm/timex.h

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		/*
		* linux/arch/unicore32/include/asm/timex.h
		*
		* Code specific to PKUnity SoC and UniCore ISA
		*
		* Copyright (C) 2001-2010 GUAN Xue-tao
		*
		* 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.
		*/

		#ifndef __UNICORE_TIMEX_H__
		#define __UNICORE_TIMEX_H__

		#ifdef CONFIG_ARCH_FPGA

		/* in FPGA, APB clock is 33M, and OST clock is 32K, */
		/* so, 1M is selected for timer interrupt correctly */
		#define CLOCK_TICK_RATE (32*1024)

		#endif

		#if defined(CONFIG_PUV3_DB0913) \
		\|\| defined(CONFIG_PUV3_NB0916) \
		\|\| defined(CONFIG_PUV3_SMW0919)

		#define CLOCK_TICK_RATE (14318000)

		#endif

		#include <asm-generic/timex.h>

		#endif

arch/unicore32/kernel/pwm.c

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Original line number	Diff line number	Diff line
		/*
		* linux/arch/unicore32/kernel/pwm.c
		*
		* Code specific to PKUnity SoC and UniCore ISA
		*
		* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
		* Copyright (C) 2001-2010 Guan Xuetao
		*
		* 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/module.h>
		#include <linux/kernel.h>
		#include <linux/platform_device.h>
		#include <linux/slab.h>
		#include <linux/err.h>
		#include <linux/clk.h>
		#include <linux/io.h>
		#include <linux/pwm.h>

		#include <asm/div64.h>
		#include <mach/hardware.h>

		struct pwm_device {
		struct list_head node;
		struct platform_device *pdev;

		const char *label;
		struct clk *clk;
		int clk_enabled;

		unsigned int use_count;
		unsigned int pwm_id;
		};

		/*
		* period_ns = 10^9 * (PRESCALE + 1) * (PV + 1) / PWM_CLK_RATE
		* duty_ns = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE
		*/
		int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
		{
		unsigned long long c;
		unsigned long period_cycles, prescale, pv, dc;

		if (pwm == NULL \|\| period_ns == 0 \|\| duty_ns > period_ns)
		return -EINVAL;

		c = clk_get_rate(pwm->clk);
		c = c * period_ns;
		do_div(c, 1000000000);
		period_cycles = c;

		if (period_cycles < 1)
		period_cycles = 1;
		prescale = (period_cycles - 1) / 1024;
		pv = period_cycles / (prescale + 1) - 1;

		if (prescale > 63)
		return -EINVAL;

		if (duty_ns == period_ns)
		dc = OST_PWMDCCR_FDCYCLE;
		else
		dc = (pv + 1) * duty_ns / period_ns;

		/* NOTE: the clock to PWM has to be enabled first
		* before writing to the registers
		*/
		clk_enable(pwm->clk);
		OST_PWMPWCR = prescale;
		OST_PWMDCCR = pv - dc;
		OST_PWMPCR = pv;
		clk_disable(pwm->clk);

		return 0;
		}
		EXPORT_SYMBOL(pwm_config);

		int pwm_enable(struct pwm_device *pwm)
		{
		int rc = 0;

		if (!pwm->clk_enabled) {
		rc = clk_enable(pwm->clk);
		if (!rc)
		pwm->clk_enabled = 1;
		}
		return rc;
		}
		EXPORT_SYMBOL(pwm_enable);

		void pwm_disable(struct pwm_device *pwm)
		{
		if (pwm->clk_enabled) {
		clk_disable(pwm->clk);
		pwm->clk_enabled = 0;
		}
		}
		EXPORT_SYMBOL(pwm_disable);

		static DEFINE_MUTEX(pwm_lock);
		static LIST_HEAD(pwm_list);

		struct pwm_device pwm_request(int pwm_id, const char label)
		{
		struct pwm_device *pwm;
		int found = 0;

		mutex_lock(&pwm_lock);

		list_for_each_entry(pwm, &pwm_list, node) {
		if (pwm->pwm_id == pwm_id) {
		found = 1;
		break;
		}
		}

		if (found) {
		if (pwm->use_count == 0) {
		pwm->use_count++;
		pwm->label = label;
		} else
		pwm = ERR_PTR(-EBUSY);
		} else
		pwm = ERR_PTR(-ENOENT);

		mutex_unlock(&pwm_lock);
		return pwm;
		}
		EXPORT_SYMBOL(pwm_request);

		void pwm_free(struct pwm_device *pwm)
		{
		mutex_lock(&pwm_lock);

		if (pwm->use_count) {
		pwm->use_count--;
		pwm->label = NULL;
		} else
		pr_warning("PWM device already freed\n");

		mutex_unlock(&pwm_lock);
		}
		EXPORT_SYMBOL(pwm_free);

		static inline void __add_pwm(struct pwm_device *pwm)
		{
		mutex_lock(&pwm_lock);
		list_add_tail(&pwm->node, &pwm_list);
		mutex_unlock(&pwm_lock);
		}

		static struct pwm_device pwm_probe(struct platform_device pdev,
		unsigned int pwm_id, struct pwm_device *parent_pwm)
		{
		struct pwm_device *pwm;
		struct resource *r;
		int ret = 0;

		pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
		if (pwm == NULL) {
		dev_err(&pdev->dev, "failed to allocate memory\n");
		return ERR_PTR(-ENOMEM);
		}

		pwm->clk = clk_get(NULL, "OST_CLK");
		if (IS_ERR(pwm->clk)) {
		ret = PTR_ERR(pwm->clk);
		goto err_free;
		}
		pwm->clk_enabled = 0;

		pwm->use_count = 0;
		pwm->pwm_id = pwm_id;
		pwm->pdev = pdev;

		r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (r == NULL) {
		dev_err(&pdev->dev, "no memory resource defined\n");
		ret = -ENODEV;
		goto err_free_clk;
		}

		r = request_mem_region(r->start, resource_size(r), pdev->name);
		if (r == NULL) {
		dev_err(&pdev->dev, "failed to request memory resource\n");
		ret = -EBUSY;
		goto err_free_clk;
		}

		__add_pwm(pwm);
		platform_set_drvdata(pdev, pwm);
		return pwm;

		err_free_clk:
		clk_put(pwm->clk);
		err_free:
		kfree(pwm);
		return ERR_PTR(ret);
		}

		static int __devinit puv3_pwm_probe(struct platform_device *pdev)
		{
		struct pwm_device *pwm = pwm_probe(pdev, pdev->id, NULL);

		if (IS_ERR(pwm))
		return PTR_ERR(pwm);

		return 0;
		}

		static int __devexit pwm_remove(struct platform_device *pdev)
		{
		struct pwm_device *pwm;
		struct resource *r;

		pwm = platform_get_drvdata(pdev);
		if (pwm == NULL)
		return -ENODEV;

		mutex_lock(&pwm_lock);
		list_del(&pwm->node);
		mutex_unlock(&pwm_lock);

		r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		release_mem_region(r->start, resource_size(r));

		clk_put(pwm->clk);
		kfree(pwm);
		return 0;
		}

		static struct platform_driver puv3_pwm_driver = {
		.driver = {
		.name = "PKUnity-v3-PWM",
		},
		.probe = puv3_pwm_probe,
		.remove = __devexit_p(pwm_remove),
		};

		static int __init pwm_init(void)
		{
		int ret = 0;

		ret = platform_driver_register(&puv3_pwm_driver);
		if (ret) {
		printk(KERN_ERR "failed to register puv3_pwm_driver\n");
		return ret;
		}

		return ret;
		}
		arch_initcall(pwm_init);

		static void __exit pwm_exit(void)
		{
		platform_driver_unregister(&puv3_pwm_driver);
		}
		module_exit(pwm_exit);

		MODULE_LICENSE("GPL v2");

arch/unicore32/kernel/rtc.c

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		/*
		* linux/arch/unicore32/kernel/rtc.c
		*
		* Code specific to PKUnity SoC and UniCore ISA
		*
		* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
		* Copyright (C) 2001-2010 Guan Xuetao
		*
		* 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/module.h>
		#include <linux/fs.h>
		#include <linux/string.h>
		#include <linux/init.h>
		#include <linux/platform_device.h>
		#include <linux/interrupt.h>
		#include <linux/rtc.h>
		#include <linux/bcd.h>
		#include <linux/clk.h>
		#include <linux/log2.h>
		#include <linux/slab.h>
		#include <linux/uaccess.h>
		#include <linux/io.h>

		#include <asm/irq.h>
		#include <mach/hardware.h>

		static struct resource *puv3_rtc_mem;

		static int puv3_rtc_alarmno = IRQ_RTCAlarm;
		static int puv3_rtc_tickno = IRQ_RTC;

		static DEFINE_SPINLOCK(puv3_rtc_pie_lock);

		/* IRQ Handlers */

		static irqreturn_t puv3_rtc_alarmirq(int irq, void *id)
		{
		struct rtc_device *rdev = id;

		RTC_RTSR \|= RTC_RTSR_AL;
		rtc_update_irq(rdev, 1, RTC_AF \| RTC_IRQF);
		return IRQ_HANDLED;
		}

		static irqreturn_t puv3_rtc_tickirq(int irq, void *id)
		{
		struct rtc_device *rdev = id;

		RTC_RTSR \|= RTC_RTSR_HZ;
		rtc_update_irq(rdev, 1, RTC_PF \| RTC_IRQF);
		return IRQ_HANDLED;
		}

		/* Update control registers */
		static void puv3_rtc_setaie(int to)
		{
		unsigned int tmp;

		pr_debug("%s: aie=%d\n", __func__, to);

		tmp = RTC_RTSR & ~RTC_RTSR_ALE;

		if (to)
		tmp \|= RTC_RTSR_ALE;

		RTC_RTSR = tmp;
		}

		static int puv3_rtc_setpie(struct device *dev, int enabled)
		{
		unsigned int tmp;

		pr_debug("%s: pie=%d\n", __func__, enabled);

		spin_lock_irq(&puv3_rtc_pie_lock);
		tmp = RTC_RTSR & ~RTC_RTSR_HZE;

		if (enabled)
		tmp \|= RTC_RTSR_HZE;

		RTC_RTSR = tmp;
		spin_unlock_irq(&puv3_rtc_pie_lock);

		return 0;
		}

		static int puv3_rtc_setfreq(struct device *dev, int freq)
		{
		return 0;
		}

		/* Time read/write */

		static int puv3_rtc_gettime(struct device dev, struct rtc_time rtc_tm)
		{
		rtc_time_to_tm(RTC_RCNR, rtc_tm);

		pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
		rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
		rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);

		return 0;
		}

		static int puv3_rtc_settime(struct device dev, struct rtc_time tm)
		{
		unsigned long rtc_count = 0;

		pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n",
		tm->tm_year, tm->tm_mon, tm->tm_mday,
		tm->tm_hour, tm->tm_min, tm->tm_sec);

		rtc_tm_to_time(tm, &rtc_count);
		RTC_RCNR = rtc_count;

		return 0;
		}

		static int puv3_rtc_getalarm(struct device dev, struct rtc_wkalrm alrm)
		{
		struct rtc_time *alm_tm = &alrm->time;

		rtc_time_to_tm(RTC_RTAR, alm_tm);

		alrm->enabled = RTC_RTSR & RTC_RTSR_ALE;

		pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
		alrm->enabled,
		alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
		alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);

		return 0;
		}

		static int puv3_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
		{
		struct rtc_time *tm = &alrm->time;
		unsigned long rtcalarm_count = 0;

		pr_debug("puv3_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
		alrm->enabled,
		tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
		tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);

		rtc_tm_to_time(tm, &rtcalarm_count);
		RTC_RTAR = rtcalarm_count;

		puv3_rtc_setaie(alrm->enabled);

		if (alrm->enabled)
		enable_irq_wake(puv3_rtc_alarmno);
		else
		disable_irq_wake(puv3_rtc_alarmno);

		return 0;
		}

		static int puv3_rtc_proc(struct device dev, struct seq_file seq)
		{
		seq_printf(seq, "periodic_IRQ\t: %s\n",
		(RTC_RTSR & RTC_RTSR_HZE) ? "yes" : "no");
		return 0;
		}

		static int puv3_rtc_open(struct device *dev)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
		int ret;

		ret = request_irq(puv3_rtc_alarmno, puv3_rtc_alarmirq,
		IRQF_DISABLED, "pkunity-rtc alarm", rtc_dev);

		if (ret) {
		dev_err(dev, "IRQ%d error %d\n", puv3_rtc_alarmno, ret);
		return ret;
		}

		ret = request_irq(puv3_rtc_tickno, puv3_rtc_tickirq,
		IRQF_DISABLED, "pkunity-rtc tick", rtc_dev);

		if (ret) {
		dev_err(dev, "IRQ%d error %d\n", puv3_rtc_tickno, ret);
		goto tick_err;
		}

		return ret;

		tick_err:
		free_irq(puv3_rtc_alarmno, rtc_dev);
		return ret;
		}

		static void puv3_rtc_release(struct device *dev)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct rtc_device *rtc_dev = platform_get_drvdata(pdev);

		/* do not clear AIE here, it may be needed for wake */

		puv3_rtc_setpie(dev, 0);
		free_irq(puv3_rtc_alarmno, rtc_dev);
		free_irq(puv3_rtc_tickno, rtc_dev);
		}

		static const struct rtc_class_ops puv3_rtcops = {
		.open = puv3_rtc_open,
		.release = puv3_rtc_release,
		.read_time = puv3_rtc_gettime,
		.set_time = puv3_rtc_settime,
		.read_alarm = puv3_rtc_getalarm,
		.set_alarm = puv3_rtc_setalarm,
		.irq_set_freq = puv3_rtc_setfreq,
		.irq_set_state = puv3_rtc_setpie,
		.proc = puv3_rtc_proc,
		};

		static void puv3_rtc_enable(struct platform_device *pdev, int en)
		{
		if (!en) {
		RTC_RTSR &= ~RTC_RTSR_HZE;
		} else {
		/* re-enable the device, and check it is ok */

		if ((RTC_RTSR & RTC_RTSR_HZE) == 0) {
		dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
		RTC_RTSR \|= RTC_RTSR_HZE;
		}
		}
		}

		static int puv3_rtc_remove(struct platform_device *dev)
		{
		struct rtc_device *rtc = platform_get_drvdata(dev);

		platform_set_drvdata(dev, NULL);
		rtc_device_unregister(rtc);

		puv3_rtc_setpie(&dev->dev, 0);
		puv3_rtc_setaie(0);

		release_resource(puv3_rtc_mem);
		kfree(puv3_rtc_mem);

		return 0;
		}

		static int puv3_rtc_probe(struct platform_device *pdev)
		{
		struct rtc_device *rtc;
		struct resource *res;
		int ret;

		pr_debug("%s: probe=%p\n", __func__, pdev);

		/* find the IRQs */

		puv3_rtc_tickno = platform_get_irq(pdev, 1);
		if (puv3_rtc_tickno < 0) {
		dev_err(&pdev->dev, "no irq for rtc tick\n");
		return -ENOENT;
		}

		puv3_rtc_alarmno = platform_get_irq(pdev, 0);
		if (puv3_rtc_alarmno < 0) {
		dev_err(&pdev->dev, "no irq for alarm\n");
		return -ENOENT;
		}

		pr_debug("PKUnity_rtc: tick irq %d, alarm irq %d\n",
		puv3_rtc_tickno, puv3_rtc_alarmno);

		/* get the memory region */

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (res == NULL) {
		dev_err(&pdev->dev, "failed to get memory region resource\n");
		return -ENOENT;
		}

		puv3_rtc_mem = request_mem_region(res->start,
		res->end-res->start+1,
		pdev->name);

		if (puv3_rtc_mem == NULL) {
		dev_err(&pdev->dev, "failed to reserve memory region\n");
		ret = -ENOENT;
		goto err_nores;
		}

		puv3_rtc_enable(pdev, 1);

		puv3_rtc_setfreq(&pdev->dev, 1);

		/* register RTC and exit */

		rtc = rtc_device_register("pkunity", &pdev->dev, &puv3_rtcops,
		THIS_MODULE);

		if (IS_ERR(rtc)) {
		dev_err(&pdev->dev, "cannot attach rtc\n");
		ret = PTR_ERR(rtc);
		goto err_nortc;
		}

		/* platform setup code should have handled this; sigh */
		if (!device_can_wakeup(&pdev->dev))
		device_init_wakeup(&pdev->dev, 1);

		platform_set_drvdata(pdev, rtc);
		return 0;

		err_nortc:
		puv3_rtc_enable(pdev, 0);
		release_resource(puv3_rtc_mem);

		err_nores:
		return ret;
		}

		#ifdef CONFIG_PM

		/* RTC Power management control */

		static int ticnt_save;

		static int puv3_rtc_suspend(struct platform_device *pdev, pm_message_t state)
		{
		/* save RTAR for anyone using periodic interrupts */
		ticnt_save = RTC_RTAR;
		puv3_rtc_enable(pdev, 0);
		return 0;
		}

		static int puv3_rtc_resume(struct platform_device *pdev)
		{
		puv3_rtc_enable(pdev, 1);
		RTC_RTAR = ticnt_save;
		return 0;
		}
		#else
		#define puv3_rtc_suspend NULL
		#define puv3_rtc_resume NULL
		#endif

		static struct platform_driver puv3_rtcdrv = {
		.probe = puv3_rtc_probe,
		.remove = __devexit_p(puv3_rtc_remove),
		.suspend = puv3_rtc_suspend,
		.resume = puv3_rtc_resume,
		.driver = {
		.name = "PKUnity-v3-RTC",
		.owner = THIS_MODULE,
		}
		};

		static char __initdata banner[] = "PKUnity-v3 RTC, (c) 2009 PKUnity Co.\n";

		static int __init puv3_rtc_init(void)
		{
		printk(banner);
		return platform_driver_register(&puv3_rtcdrv);
		}

		static void __exit puv3_rtc_exit(void)
		{
		platform_driver_unregister(&puv3_rtcdrv);
		}

		module_init(puv3_rtc_init);
		module_exit(puv3_rtc_exit);

		MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip");
		MODULE_AUTHOR("Hu Dongliang");
		MODULE_LICENSE("GPL v2");

arch/unicore32/kernel/time.c

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+148 −0

Original line number	Diff line number	Diff line
		/*
		* linux/arch/unicore32/kernel/time.c
		*
		* Code specific to PKUnity SoC and UniCore ISA
		*
		* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
		* Copyright (C) 2001-2010 Guan Xuetao
		*
		* 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/errno.h>
		#include <linux/interrupt.h>
		#include <linux/irq.h>
		#include <linux/timex.h>
		#include <linux/clockchips.h>

		#include <mach/hardware.h>

		#define MIN_OSCR_DELTA 2

		static irqreturn_t puv3_ost0_interrupt(int irq, void *dev_id)
		{
		struct clock_event_device *c = dev_id;

		/* Disarm the compare/match, signal the event. */
		OST_OIER &= ~OST_OIER_E0;
		OST_OSSR &= ~OST_OSSR_M0;
		c->event_handler(c);

		return IRQ_HANDLED;
		}

		static int
		puv3_osmr0_set_next_event(unsigned long delta, struct clock_event_device *c)
		{
		unsigned long next, oscr;

		OST_OIER \|= OST_OIER_E0;
		next = OST_OSCR + delta;
		OST_OSMR0 = next;
		oscr = OST_OSCR;

		return (signed)(next - oscr) <= MIN_OSCR_DELTA ? -ETIME : 0;
		}

		static void
		puv3_osmr0_set_mode(enum clock_event_mode mode, struct clock_event_device *c)
		{
		switch (mode) {
		case CLOCK_EVT_MODE_ONESHOT:
		case CLOCK_EVT_MODE_UNUSED:
		case CLOCK_EVT_MODE_SHUTDOWN:
		OST_OIER &= ~OST_OIER_E0;
		OST_OSSR &= ~OST_OSSR_M0;
		break;

		case CLOCK_EVT_MODE_RESUME:
		case CLOCK_EVT_MODE_PERIODIC:
		break;
		}
		}

		static struct clock_event_device ckevt_puv3_osmr0 = {
		.name = "osmr0",
		.features = CLOCK_EVT_FEAT_ONESHOT,
		#ifdef CONFIG_ARCH_FPGA
		.shift = 18, /* correct shift val: 16, but warn_on_slowpath */
		#else
		.shift = 30,
		#endif
		.rating = 200,
		.set_next_event = puv3_osmr0_set_next_event,
		.set_mode = puv3_osmr0_set_mode,
		};

		static cycle_t puv3_read_oscr(struct clocksource *cs)
		{
		return OST_OSCR;
		}

		static struct clocksource cksrc_puv3_oscr = {
		.name = "oscr",
		.rating = 200,
		.read = puv3_read_oscr,
		.mask = CLOCKSOURCE_MASK(32),
		.flags = CLOCK_SOURCE_IS_CONTINUOUS,
		};

		static struct irqaction puv3_timer_irq = {
		.name = "ost0",
		.flags = IRQF_DISABLED \| IRQF_TIMER \| IRQF_IRQPOLL,
		.handler = puv3_ost0_interrupt,
		.dev_id = &ckevt_puv3_osmr0,
		};

		void __init time_init(void)
		{
		OST_OIER = 0; /* disable any timer interrupts */
		OST_OSSR = 0; /* clear status on all timers */

		ckevt_puv3_osmr0.mult =
		div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC, ckevt_puv3_osmr0.shift);
		ckevt_puv3_osmr0.max_delta_ns =
		clockevent_delta2ns(0x7fffffff, &ckevt_puv3_osmr0);
		ckevt_puv3_osmr0.min_delta_ns =
		clockevent_delta2ns(MIN_OSCR_DELTA * 2, &ckevt_puv3_osmr0) + 1;
		ckevt_puv3_osmr0.cpumask = cpumask_of(0);

		setup_irq(IRQ_TIMER0, &puv3_timer_irq);

		clocksource_register_hz(&cksrc_puv3_oscr, CLOCK_TICK_RATE);
		clockevents_register_device(&ckevt_puv3_osmr0);
		}

		#ifdef CONFIG_PM
		unsigned long osmr[4], oier;

		void puv3_timer_suspend(void)
		{
		osmr[0] = OST_OSMR0;
		osmr[1] = OST_OSMR1;
		osmr[2] = OST_OSMR2;
		osmr[3] = OST_OSMR3;
		oier = OST_OIER;
		}

		void puv3_timer_resume(void)
		{
		OST_OSSR = 0;
		OST_OSMR0 = osmr[0];
		OST_OSMR1 = osmr[1];
		OST_OSMR2 = osmr[2];
		OST_OSMR3 = osmr[3];
		OST_OIER = oier;

		/*
		* OSMR0 is the system timer: make sure OSCR is sufficiently behind
		*/
		OST_OSCR = OST_OSMR0 - LATCH;
		}
		#else
		void puv3_timer_suspend(void) { };
		void puv3_timer_resume(void) { };
		#endif