[linux-2.6-block.git] / drivers / rtc / rtc-puv3.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * RTC driver code specific to PKUnity SoC and UniCore ISA
 *
 *	Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
 *	Copyright (C) 2001-2010 Guan Xuetao
 */

#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;

	writel(readl(RTC_RTSR) | RTC_RTSR_AL, RTC_RTSR);
	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;

	writel(readl(RTC_RTSR) | RTC_RTSR_HZ, RTC_RTSR);
	rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
	return IRQ_HANDLED;
}

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

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

	tmp = readl(RTC_RTSR) & ~RTC_RTSR_ALE;

	if (to)
		tmp |= RTC_RTSR_ALE;

	writel(tmp, RTC_RTSR);
}

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

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

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

	if (enabled)
		tmp |= RTC_RTSR_HZE;

	writel(tmp, RTC_RTSR);
	spin_unlock_irq(&puv3_rtc_pie_lock);

	return 0;
}

/* Time read/write */
static int puv3_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
{
	rtc_time_to_tm(readl(RTC_RCNR), rtc_tm);

	dev_dbg(dev, "read time %ptRr\n", rtc_tm);

	return 0;
}

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

	dev_dbg(dev, "set time %ptRr\n", tm);

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

	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(readl(RTC_RTAR), alm_tm);

	alrm->enabled = readl(RTC_RTSR) & RTC_RTSR_ALE;

	dev_dbg(dev, "read alarm: %d, %ptRr\n", alrm->enabled, alm_tm);

	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;

	dev_dbg(dev, "set alarm: %d, %ptRr\n", alrm->enabled, tm);

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

	puv3_rtc_setaie(dev, 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",
		     (readl(RTC_RTSR) & RTC_RTSR_HZE) ? "yes" : "no");
	return 0;
}

static const struct rtc_class_ops puv3_rtcops = {
	.read_time	= puv3_rtc_gettime,
	.set_time	= puv3_rtc_settime,
	.read_alarm	= puv3_rtc_getalarm,
	.set_alarm	= puv3_rtc_setalarm,
	.proc	        = puv3_rtc_proc,
};

static void puv3_rtc_enable(struct device *dev, int en)
{
	if (!en) {
		writel(readl(RTC_RTSR) & ~RTC_RTSR_HZE, RTC_RTSR);
	} else {
		/* re-enable the device, and check it is ok */
		if ((readl(RTC_RTSR) & RTC_RTSR_HZE) == 0) {
			dev_info(dev, "rtc disabled, re-enabling\n");
			writel(readl(RTC_RTSR) | RTC_RTSR_HZE, RTC_RTSR);
		}
	}
}

static int puv3_rtc_remove(struct platform_device *dev)
{
	puv3_rtc_setpie(&dev->dev, 0);
	puv3_rtc_setaie(&dev->dev, 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;

	dev_dbg(&pdev->dev, "%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;
	}

	dev_dbg(&pdev->dev, "PKUnity_rtc: tick irq %d, alarm irq %d\n",
		 puv3_rtc_tickno, puv3_rtc_alarmno);

	rtc = devm_rtc_allocate_device(&pdev->dev);
	if (IS_ERR(rtc))
		return PTR_ERR(rtc);

	ret = devm_request_irq(&pdev->dev, puv3_rtc_alarmno, puv3_rtc_alarmirq,
			       0, "pkunity-rtc alarm", rtc);
	if (ret) {
		dev_err(&pdev->dev, "IRQ%d error %d\n", puv3_rtc_alarmno, ret);
		return ret;
	}

	ret = devm_request_irq(&pdev->dev, puv3_rtc_tickno, puv3_rtc_tickirq,
			       0, "pkunity-rtc tick", rtc);
	if (ret) {
		dev_err(&pdev->dev, "IRQ%d error %d\n", puv3_rtc_tickno, ret);
		return ret;
	}

	/* 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, resource_size(res),
					  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->dev, 1);

	/* register RTC and exit */
	rtc->ops = &puv3_rtcops;
	ret = rtc_register_device(rtc);
	if (ret) {
		dev_err(&pdev->dev, "cannot attach rtc\n");
		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->dev, 0);
	release_resource(puv3_rtc_mem);

 err_nores:
	return ret;
}

#ifdef CONFIG_PM_SLEEP
static int ticnt_save;

static int puv3_rtc_suspend(struct device *dev)
{
	/* save RTAR for anyone using periodic interrupts */
	ticnt_save = readl(RTC_RTAR);
	puv3_rtc_enable(dev, 0);
	return 0;
}

static int puv3_rtc_resume(struct device *dev)
{
	puv3_rtc_enable(dev, 1);
	writel(ticnt_save, RTC_RTAR);
	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(puv3_rtc_pm_ops, puv3_rtc_suspend, puv3_rtc_resume);

static struct platform_driver puv3_rtc_driver = {
	.probe		= puv3_rtc_probe,
	.remove		= puv3_rtc_remove,
	.driver		= {
		.name	= "PKUnity-v3-RTC",
		.pm	= &puv3_rtc_pm_ops,
	}
};

module_platform_driver(puv3_rtc_driver);

MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip");
MODULE_AUTHOR("Hu Dongliang");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
02b2ee16	2	/*
2809e80b	3	* RTC driver code specific to PKUnity SoC and UniCore ISA
02b2ee16 G	4	*
	5	* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
	6	* Copyright (C) 2001-2010 Guan Xuetao
02b2ee16 G	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/fs.h>
	11	#include <linux/string.h>
	12	#include <linux/init.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/rtc.h>
	16	#include <linux/bcd.h>
	17	#include <linux/clk.h>
	18	#include <linux/log2.h>
	19	#include <linux/slab.h>
	20	#include <linux/uaccess.h>
	21	#include <linux/io.h>
	22
	23	#include <asm/irq.h>
	24	#include <mach/hardware.h>
	25
	26	static struct resource *puv3_rtc_mem;
	27
	28	static int puv3_rtc_alarmno = IRQ_RTCAlarm;
	29	static int puv3_rtc_tickno = IRQ_RTC;
	30
	31	static DEFINE_SPINLOCK(puv3_rtc_pie_lock);
	32
	33	/* IRQ Handlers */
02b2ee16 G	34	static irqreturn_t puv3_rtc_alarmirq(int irq, void *id)
	35	{
	36	struct rtc_device *rdev = id;
	37
e5abf78b	38	writel(readl(RTC_RTSR) \| RTC_RTSR_AL, RTC_RTSR);
02b2ee16 G	39	rtc_update_irq(rdev, 1, RTC_AF \| RTC_IRQF);
	40	return IRQ_HANDLED;
	41	}
	42
	43	static irqreturn_t puv3_rtc_tickirq(int irq, void *id)
	44	{
	45	struct rtc_device *rdev = id;
	46
e5abf78b	47	writel(readl(RTC_RTSR) \| RTC_RTSR_HZ, RTC_RTSR);
02b2ee16 G	48	rtc_update_irq(rdev, 1, RTC_PF \| RTC_IRQF);
	49	return IRQ_HANDLED;
	50	}
	51
	52	/* Update control registers */
1fbc4c4d	53	static void puv3_rtc_setaie(struct device *dev, int to)
02b2ee16 G	54	{
	55	unsigned int tmp;
	56
1fbc4c4d	57	dev_dbg(dev, "%s: aie=%d\n", __func__, to);
02b2ee16	58
e5abf78b	59	tmp = readl(RTC_RTSR) & ~RTC_RTSR_ALE;
02b2ee16 G	60
	61	if (to)
	62	tmp \|= RTC_RTSR_ALE;
	63
e5abf78b	64	writel(tmp, RTC_RTSR);
02b2ee16 G	65	}
	66
	67	static int puv3_rtc_setpie(struct device *dev, int enabled)
	68	{
	69	unsigned int tmp;
	70
c863810c	71	dev_dbg(dev, "%s: pie=%d\n", __func__, enabled);
02b2ee16 G	72
02b2ee16 G	73	spin_lock_irq(&puv3_rtc_pie_lock);
e5abf78b	74	tmp = readl(RTC_RTSR) & ~RTC_RTSR_HZE;
02b2ee16 G	75
	76	if (enabled)
	77	tmp \|= RTC_RTSR_HZE;
	78
e5abf78b	79	writel(tmp, RTC_RTSR);
02b2ee16 G	80	spin_unlock_irq(&puv3_rtc_pie_lock);
	81
	82	return 0;
	83	}
	84
02b2ee16	85	/* Time read/write */
02b2ee16 G	86	static int puv3_rtc_gettime(struct device dev, struct rtc_time rtc_tm)
02b2ee16 G	87	{
e5abf78b	88	rtc_time_to_tm(readl(RTC_RCNR), rtc_tm);
02b2ee16	89
b2db0a29	90	dev_dbg(dev, "read time %ptRr\n", rtc_tm);
02b2ee16 G	91
	92	return 0;
	93	}
	94
	95	static int puv3_rtc_settime(struct device dev, struct rtc_time tm)
	96	{
	97	unsigned long rtc_count = 0;
	98
b2db0a29	99	dev_dbg(dev, "set time %ptRr\n", tm);
02b2ee16 G	100
02b2ee16 G	101	rtc_tm_to_time(tm, &rtc_count);
e5abf78b	102	writel(rtc_count, RTC_RCNR);
02b2ee16 G	103
	104	return 0;
	105	}
	106
	107	static int puv3_rtc_getalarm(struct device dev, struct rtc_wkalrm alrm)
	108	{
	109	struct rtc_time *alm_tm = &alrm->time;
	110
e5abf78b	111	rtc_time_to_tm(readl(RTC_RTAR), alm_tm);
02b2ee16	112
e5abf78b	113	alrm->enabled = readl(RTC_RTSR) & RTC_RTSR_ALE;
02b2ee16	114
b2db0a29	115	dev_dbg(dev, "read alarm: %d, %ptRr\n", alrm->enabled, alm_tm);
02b2ee16 G	116
	117	return 0;
	118	}
	119
	120	static int puv3_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
	121	{
	122	struct rtc_time *tm = &alrm->time;
	123	unsigned long rtcalarm_count = 0;
	124
b2db0a29	125	dev_dbg(dev, "set alarm: %d, %ptRr\n", alrm->enabled, tm);
02b2ee16 G	126
02b2ee16 G	127	rtc_tm_to_time(tm, &rtcalarm_count);
e5abf78b	128	writel(rtcalarm_count, RTC_RTAR);
02b2ee16	129
73fa5406	130	puv3_rtc_setaie(dev, alrm->enabled);
02b2ee16 G	131
	132	if (alrm->enabled)
	133	enable_irq_wake(puv3_rtc_alarmno);
	134	else
	135	disable_irq_wake(puv3_rtc_alarmno);
	136
	137	return 0;
	138	}
	139
	140	static int puv3_rtc_proc(struct device dev, struct seq_file seq)
	141	{
	142	seq_printf(seq, "periodic_IRQ\t: %s\n",
e5abf78b	143	(readl(RTC_RTSR) & RTC_RTSR_HZE) ? "yes" : "no");
02b2ee16 G	144	return 0;
	145	}
	146
02b2ee16	147	static const struct rtc_class_ops puv3_rtcops = {
02b2ee16 G	148	.read_time = puv3_rtc_gettime,
	149	.set_time = puv3_rtc_settime,
	150	.read_alarm = puv3_rtc_getalarm,
	151	.set_alarm = puv3_rtc_setalarm,
02b2ee16 G	152	.proc = puv3_rtc_proc,
	153	};
	154
5936fdb9	155	static void puv3_rtc_enable(struct device *dev, int en)
02b2ee16 G	156	{
02b2ee16 G	157	if (!en) {
e5abf78b	158	writel(readl(RTC_RTSR) & ~RTC_RTSR_HZE, RTC_RTSR);
02b2ee16 G	159	} else {
02b2ee16 G	160	/* re-enable the device, and check it is ok */
e5abf78b	161	if ((readl(RTC_RTSR) & RTC_RTSR_HZE) == 0) {
5936fdb9	162	dev_info(dev, "rtc disabled, re-enabling\n");
e5abf78b	163	writel(readl(RTC_RTSR) \| RTC_RTSR_HZE, RTC_RTSR);
02b2ee16 G	164	}
	165	}
	166	}
	167
5a167f45	168	static int puv3_rtc_remove(struct platform_device *dev)
02b2ee16	169	{
02b2ee16	170	puv3_rtc_setpie(&dev->dev, 0);
1fbc4c4d	171	puv3_rtc_setaie(&dev->dev, 0);
02b2ee16 G	172
	173	release_resource(puv3_rtc_mem);
	174	kfree(puv3_rtc_mem);
	175
	176	return 0;
	177	}
	178
5a167f45	179	static int puv3_rtc_probe(struct platform_device *pdev)
02b2ee16 G	180	{
	181	struct rtc_device *rtc;
	182	struct resource *res;
	183	int ret;
	184
1fbc4c4d	185	dev_dbg(&pdev->dev, "%s: probe=%p\n", __func__, pdev);
02b2ee16 G	186
02b2ee16 G	187	/* find the IRQs */
02b2ee16 G	188	puv3_rtc_tickno = platform_get_irq(pdev, 1);
	189	if (puv3_rtc_tickno < 0) {
	190	dev_err(&pdev->dev, "no irq for rtc tick\n");
	191	return -ENOENT;
	192	}
	193
	194	puv3_rtc_alarmno = platform_get_irq(pdev, 0);
	195	if (puv3_rtc_alarmno < 0) {
	196	dev_err(&pdev->dev, "no irq for alarm\n");
	197	return -ENOENT;
	198	}
	199
1fbc4c4d	200	dev_dbg(&pdev->dev, "PKUnity_rtc: tick irq %d, alarm irq %d\n",
02b2ee16 G	201	puv3_rtc_tickno, puv3_rtc_alarmno);
02b2ee16 G	202
5539ba54 AB	203	rtc = devm_rtc_allocate_device(&pdev->dev);
	204	if (IS_ERR(rtc))
	205	return PTR_ERR(rtc);
	206
60d34552 AB	207	ret = devm_request_irq(&pdev->dev, puv3_rtc_alarmno, puv3_rtc_alarmirq,
	208	0, "pkunity-rtc alarm", rtc);
	209	if (ret) {
	210	dev_err(&pdev->dev, "IRQ%d error %d\n", puv3_rtc_alarmno, ret);
	211	return ret;
	212	}
	213
	214	ret = devm_request_irq(&pdev->dev, puv3_rtc_tickno, puv3_rtc_tickirq,
	215	0, "pkunity-rtc tick", rtc);
	216	if (ret) {
	217	dev_err(&pdev->dev, "IRQ%d error %d\n", puv3_rtc_tickno, ret);
	218	return ret;
	219	}
	220
02b2ee16	221	/* get the memory region */
02b2ee16 G	222	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	223	if (res == NULL) {
	224	dev_err(&pdev->dev, "failed to get memory region resource\n");
	225	return -ENOENT;
	226	}
	227
28f65c11 JP	228	puv3_rtc_mem = request_mem_region(res->start, resource_size(res),
28f65c11 JP	229	pdev->name);
02b2ee16 G	230
	231	if (puv3_rtc_mem == NULL) {
	232	dev_err(&pdev->dev, "failed to reserve memory region\n");
	233	ret = -ENOENT;
	234	goto err_nores;
	235	}
	236
5936fdb9	237	puv3_rtc_enable(&pdev->dev, 1);
02b2ee16	238
02b2ee16	239	/* register RTC and exit */
5539ba54 AB	240	rtc->ops = &puv3_rtcops;
	241	ret = rtc_register_device(rtc);
	242	if (ret) {
02b2ee16	243	dev_err(&pdev->dev, "cannot attach rtc\n");
02b2ee16 G	244	goto err_nortc;
	245	}
	246
	247	/* platform setup code should have handled this; sigh */
	248	if (!device_can_wakeup(&pdev->dev))
	249	device_init_wakeup(&pdev->dev, 1);
	250
	251	platform_set_drvdata(pdev, rtc);
	252	return 0;
	253
	254	err_nortc:
5936fdb9	255	puv3_rtc_enable(&pdev->dev, 0);
02b2ee16 G	256	release_resource(puv3_rtc_mem);
	257
	258	err_nores:
	259	return ret;
	260	}
	261
5936fdb9	262	#ifdef CONFIG_PM_SLEEP
02b2ee16 G	263	static int ticnt_save;
02b2ee16 G	264
5936fdb9	265	static int puv3_rtc_suspend(struct device *dev)
02b2ee16 G	266	{
02b2ee16 G	267	/* save RTAR for anyone using periodic interrupts */
e5abf78b	268	ticnt_save = readl(RTC_RTAR);
5936fdb9	269	puv3_rtc_enable(dev, 0);
02b2ee16 G	270	return 0;
	271	}
	272
5936fdb9	273	static int puv3_rtc_resume(struct device *dev)
02b2ee16	274	{
5936fdb9	275	puv3_rtc_enable(dev, 1);
e5abf78b	276	writel(ticnt_save, RTC_RTAR);
02b2ee16 G	277	return 0;
02b2ee16 G	278	}
02b2ee16 G	279	#endif
02b2ee16 G	280
5936fdb9 JH	281	static SIMPLE_DEV_PM_OPS(puv3_rtc_pm_ops, puv3_rtc_suspend, puv3_rtc_resume);
5936fdb9 JH	282
b3a0aa3a	283	static struct platform_driver puv3_rtc_driver = {
02b2ee16	284	.probe = puv3_rtc_probe,
5a167f45	285	.remove = puv3_rtc_remove,
02b2ee16 G	286	.driver = {
02b2ee16 G	287	.name = "PKUnity-v3-RTC",
5936fdb9	288	.pm = &puv3_rtc_pm_ops,
02b2ee16 G	289	}
	290	};
	291
b3a0aa3a	292	module_platform_driver(puv3_rtc_driver);
02b2ee16 G	293
	294	MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip");
	295	MODULE_AUTHOR("Hu Dongliang");
	296	MODULE_LICENSE("GPL v2");