[people/arne_f/kernel.git] / drivers / clocksource / timer-sun5i.c

/*
 * Allwinner SoCs hstimer driver.
 *
 * Copyright (C) 2013 Maxime Ripard
 *
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/clk.h>
#include <linux/clockchips.h>
#include <linux/clocksource.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqreturn.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>

#define TIMER_IRQ_EN_REG		0x00
#define TIMER_IRQ_EN(val)			BIT(val)
#define TIMER_IRQ_ST_REG		0x04
#define TIMER_CTL_REG(val)		(0x20 * (val) + 0x10)
#define TIMER_CTL_ENABLE			BIT(0)
#define TIMER_CTL_RELOAD			BIT(1)
#define TIMER_CTL_CLK_PRES(val)			(((val) & 0x7) << 4)
#define TIMER_CTL_ONESHOT			BIT(7)
#define TIMER_INTVAL_LO_REG(val)	(0x20 * (val) + 0x14)
#define TIMER_INTVAL_HI_REG(val)	(0x20 * (val) + 0x18)
#define TIMER_CNTVAL_LO_REG(val)	(0x20 * (val) + 0x1c)
#define TIMER_CNTVAL_HI_REG(val)	(0x20 * (val) + 0x20)

#define TIMER_SYNC_TICKS	3

struct sun5i_timer {
	void __iomem		*base;
	struct clk		*clk;
	struct notifier_block	clk_rate_cb;
	u32			ticks_per_jiffy;
};

#define to_sun5i_timer(x) \
	container_of(x, struct sun5i_timer, clk_rate_cb)

struct sun5i_timer_clksrc {
	struct sun5i_timer	timer;
	struct clocksource	clksrc;
};

#define to_sun5i_timer_clksrc(x) \
	container_of(x, struct sun5i_timer_clksrc, clksrc)

struct sun5i_timer_clkevt {
	struct sun5i_timer		timer;
	struct clock_event_device	clkevt;
};

#define to_sun5i_timer_clkevt(x) \
	container_of(x, struct sun5i_timer_clkevt, clkevt)

/*
 * When we disable a timer, we need to wait at least for 2 cycles of
 * the timer source clock. We will use for that the clocksource timer
 * that is already setup and runs at the same frequency than the other
 * timers, and we never will be disabled.
 */
static void sun5i_clkevt_sync(struct sun5i_timer_clkevt *ce)
{
	u32 old = readl(ce->timer.base + TIMER_CNTVAL_LO_REG(1));

	while ((old - readl(ce->timer.base + TIMER_CNTVAL_LO_REG(1))) < TIMER_SYNC_TICKS)
		cpu_relax();
}

static void sun5i_clkevt_time_stop(struct sun5i_timer_clkevt *ce, u8 timer)
{
	u32 val = readl(ce->timer.base + TIMER_CTL_REG(timer));
	writel(val & ~TIMER_CTL_ENABLE, ce->timer.base + TIMER_CTL_REG(timer));

	sun5i_clkevt_sync(ce);
}

static void sun5i_clkevt_time_setup(struct sun5i_timer_clkevt *ce, u8 timer, u32 delay)
{
	writel(delay, ce->timer.base + TIMER_INTVAL_LO_REG(timer));
}

static void sun5i_clkevt_time_start(struct sun5i_timer_clkevt *ce, u8 timer, bool periodic)
{
	u32 val = readl(ce->timer.base + TIMER_CTL_REG(timer));

	if (periodic)
		val &= ~TIMER_CTL_ONESHOT;
	else
		val |= TIMER_CTL_ONESHOT;

	writel(val | TIMER_CTL_ENABLE | TIMER_CTL_RELOAD,
	       ce->timer.base + TIMER_CTL_REG(timer));
}

static int sun5i_clkevt_shutdown(struct clock_event_device *clkevt)
{
	struct sun5i_timer_clkevt *ce = to_sun5i_timer_clkevt(clkevt);

	sun5i_clkevt_time_stop(ce, 0);
	return 0;
}

static int sun5i_clkevt_set_oneshot(struct clock_event_device *clkevt)
{
	struct sun5i_timer_clkevt *ce = to_sun5i_timer_clkevt(clkevt);

	sun5i_clkevt_time_stop(ce, 0);
	sun5i_clkevt_time_start(ce, 0, false);
	return 0;
}

static int sun5i_clkevt_set_periodic(struct clock_event_device *clkevt)
{
	struct sun5i_timer_clkevt *ce = to_sun5i_timer_clkevt(clkevt);

	sun5i_clkevt_time_stop(ce, 0);
	sun5i_clkevt_time_setup(ce, 0, ce->timer.ticks_per_jiffy);
	sun5i_clkevt_time_start(ce, 0, true);
	return 0;
}

static int sun5i_clkevt_next_event(unsigned long evt,
				   struct clock_event_device *clkevt)
{
	struct sun5i_timer_clkevt *ce = to_sun5i_timer_clkevt(clkevt);

	sun5i_clkevt_time_stop(ce, 0);
	sun5i_clkevt_time_setup(ce, 0, evt - TIMER_SYNC_TICKS);
	sun5i_clkevt_time_start(ce, 0, false);

	return 0;
}

static irqreturn_t sun5i_timer_interrupt(int irq, void *dev_id)
{
	struct sun5i_timer_clkevt *ce = (struct sun5i_timer_clkevt *)dev_id;

	writel(0x1, ce->timer.base + TIMER_IRQ_ST_REG);
	ce->clkevt.event_handler(&ce->clkevt);

	return IRQ_HANDLED;
}

static u64 sun5i_clksrc_read(struct clocksource *clksrc)
{
	struct sun5i_timer_clksrc *cs = to_sun5i_timer_clksrc(clksrc);

	return ~readl(cs->timer.base + TIMER_CNTVAL_LO_REG(1));
}

static int sun5i_rate_cb_clksrc(struct notifier_block *nb,
				unsigned long event, void *data)
{
	struct clk_notifier_data *ndata = data;
	struct sun5i_timer *timer = to_sun5i_timer(nb);
	struct sun5i_timer_clksrc *cs = container_of(timer, struct sun5i_timer_clksrc, timer);

	switch (event) {
	case PRE_RATE_CHANGE:
		clocksource_unregister(&cs->clksrc);
		break;

	case POST_RATE_CHANGE:
		clocksource_register_hz(&cs->clksrc, ndata->new_rate);
		break;

	default:
		break;
	}

	return NOTIFY_DONE;
}

static int __init sun5i_setup_clocksource(struct device_node *node,
					  void __iomem *base,
					  struct clk *clk, int irq)
{
	struct sun5i_timer_clksrc *cs;
	unsigned long rate;
	int ret;

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

	ret = clk_prepare_enable(clk);
	if (ret) {
		pr_err("Couldn't enable parent clock\n");
		goto err_free;
	}

	rate = clk_get_rate(clk);
	if (!rate) {
		pr_err("Couldn't get parent clock rate\n");
		ret = -EINVAL;
		goto err_disable_clk;
	}

	cs->timer.base = base;
	cs->timer.clk = clk;
	cs->timer.clk_rate_cb.notifier_call = sun5i_rate_cb_clksrc;
	cs->timer.clk_rate_cb.next = NULL;

	ret = clk_notifier_register(clk, &cs->timer.clk_rate_cb);
	if (ret) {
		pr_err("Unable to register clock notifier.\n");
		goto err_disable_clk;
	}

	writel(~0, base + TIMER_INTVAL_LO_REG(1));
	writel(TIMER_CTL_ENABLE | TIMER_CTL_RELOAD,
	       base + TIMER_CTL_REG(1));

	cs->clksrc.name = node->name;
	cs->clksrc.rating = 340;
	cs->clksrc.read = sun5i_clksrc_read;
	cs->clksrc.mask = CLOCKSOURCE_MASK(32);
	cs->clksrc.flags = CLOCK_SOURCE_IS_CONTINUOUS;

	ret = clocksource_register_hz(&cs->clksrc, rate);
	if (ret) {
		pr_err("Couldn't register clock source.\n");
		goto err_remove_notifier;
	}

	return 0;

err_remove_notifier:
	clk_notifier_unregister(clk, &cs->timer.clk_rate_cb);
err_disable_clk:
	clk_disable_unprepare(clk);
err_free:
	kfree(cs);
	return ret;
}

static int sun5i_rate_cb_clkevt(struct notifier_block *nb,
				unsigned long event, void *data)
{
	struct clk_notifier_data *ndata = data;
	struct sun5i_timer *timer = to_sun5i_timer(nb);
	struct sun5i_timer_clkevt *ce = container_of(timer, struct sun5i_timer_clkevt, timer);

	if (event == POST_RATE_CHANGE) {
		clockevents_update_freq(&ce->clkevt, ndata->new_rate);
		ce->timer.ticks_per_jiffy = DIV_ROUND_UP(ndata->new_rate, HZ);
	}

	return NOTIFY_DONE;
}

static int __init sun5i_setup_clockevent(struct device_node *node, void __iomem *base,
					 struct clk *clk, int irq)
{
	struct sun5i_timer_clkevt *ce;
	unsigned long rate;
	int ret;
	u32 val;

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

	ret = clk_prepare_enable(clk);
	if (ret) {
		pr_err("Couldn't enable parent clock\n");
		goto err_free;
	}

	rate = clk_get_rate(clk);
	if (!rate) {
		pr_err("Couldn't get parent clock rate\n");
		ret = -EINVAL;
		goto err_disable_clk;
	}

	ce->timer.base = base;
	ce->timer.ticks_per_jiffy = DIV_ROUND_UP(rate, HZ);
	ce->timer.clk = clk;
	ce->timer.clk_rate_cb.notifier_call = sun5i_rate_cb_clkevt;
	ce->timer.clk_rate_cb.next = NULL;

	ret = clk_notifier_register(clk, &ce->timer.clk_rate_cb);
	if (ret) {
		pr_err("Unable to register clock notifier.\n");
		goto err_disable_clk;
	}

	ce->clkevt.name = node->name;
	ce->clkevt.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
	ce->clkevt.set_next_event = sun5i_clkevt_next_event;
	ce->clkevt.set_state_shutdown = sun5i_clkevt_shutdown;
	ce->clkevt.set_state_periodic = sun5i_clkevt_set_periodic;
	ce->clkevt.set_state_oneshot = sun5i_clkevt_set_oneshot;
	ce->clkevt.tick_resume = sun5i_clkevt_shutdown;
	ce->clkevt.rating = 340;
	ce->clkevt.irq = irq;
	ce->clkevt.cpumask = cpu_possible_mask;

	/* Enable timer0 interrupt */
	val = readl(base + TIMER_IRQ_EN_REG);
	writel(val | TIMER_IRQ_EN(0), base + TIMER_IRQ_EN_REG);

	clockevents_config_and_register(&ce->clkevt, rate,
					TIMER_SYNC_TICKS, 0xffffffff);

	ret = request_irq(irq, sun5i_timer_interrupt, IRQF_TIMER | IRQF_IRQPOLL,
			  "sun5i_timer0", ce);
	if (ret) {
		pr_err("Unable to register interrupt\n");
		goto err_remove_notifier;
	}

	return 0;

err_remove_notifier:
	clk_notifier_unregister(clk, &ce->timer.clk_rate_cb);
err_disable_clk:
	clk_disable_unprepare(clk);
err_free:
	kfree(ce);
	return ret;
}

static int __init sun5i_timer_init(struct device_node *node)
{
	struct reset_control *rstc;
	void __iomem *timer_base;
	struct clk *clk;
	int irq, ret;

	timer_base = of_io_request_and_map(node, 0, of_node_full_name(node));
	if (IS_ERR(timer_base)) {
		pr_err("Can't map registers\n");
		return PTR_ERR(timer_base);;
	}

	irq = irq_of_parse_and_map(node, 0);
	if (irq <= 0) {
		pr_err("Can't parse IRQ\n");
		return -EINVAL;
	}

	clk = of_clk_get(node, 0);
	if (IS_ERR(clk)) {
		pr_err("Can't get timer clock\n");
		return PTR_ERR(clk);
	}

	rstc = of_reset_control_get(node, NULL);
	if (!IS_ERR(rstc))
		reset_control_deassert(rstc);

	ret = sun5i_setup_clocksource(node, timer_base, clk, irq);
	if (ret)
		return ret;

	return sun5i_setup_clockevent(node, timer_base, clk, irq);
}
TIMER_OF_DECLARE(sun5i_a13, "allwinner,sun5i-a13-hstimer",
			   sun5i_timer_init);
TIMER_OF_DECLARE(sun7i_a20, "allwinner,sun7i-a20-hstimer",
			   sun5i_timer_init);
Commit	Line	Data
67905540 MR	1	/*
	2	* Allwinner SoCs hstimer driver.
	3	*
	4	* Copyright (C) 2013 Maxime Ripard
	5	*
	6	* Maxime Ripard <maxime.ripard@free-electrons.com>
	7	*
	8	* This file is licensed under the terms of the GNU General Public
	9	* License version 2. This program is licensed "as is" without any
	10	* warranty of any kind, whether express or implied.
	11	*/
	12
	13	#include <linux/clk.h>
	14	#include <linux/clockchips.h>
459fa246	15	#include <linux/clocksource.h>
67905540 MR	16	#include <linux/delay.h>
	17	#include <linux/interrupt.h>
	18	#include <linux/irq.h>
	19	#include <linux/irqreturn.h>
e50a00be	20	#include <linux/reset.h>
4a59058f	21	#include <linux/slab.h>
67905540 MR	22	#include <linux/of.h>
	23	#include <linux/of_address.h>
	24	#include <linux/of_irq.h>
	25
	26	#define TIMER_IRQ_EN_REG 0x00
	27	#define TIMER_IRQ_EN(val) BIT(val)
	28	#define TIMER_IRQ_ST_REG 0x04
	29	#define TIMER_CTL_REG(val) (0x20 * (val) + 0x10)
	30	#define TIMER_CTL_ENABLE BIT(0)
	31	#define TIMER_CTL_RELOAD BIT(1)
	32	#define TIMER_CTL_CLK_PRES(val) (((val) & 0x7) << 4)
	33	#define TIMER_CTL_ONESHOT BIT(7)
	34	#define TIMER_INTVAL_LO_REG(val) (0x20 * (val) + 0x14)
	35	#define TIMER_INTVAL_HI_REG(val) (0x20 * (val) + 0x18)
	36	#define TIMER_CNTVAL_LO_REG(val) (0x20 * (val) + 0x1c)
	37	#define TIMER_CNTVAL_HI_REG(val) (0x20 * (val) + 0x20)
	38
	39	#define TIMER_SYNC_TICKS 3
	40
4a59058f MR	41	struct sun5i_timer {
	42	void __iomem *base;
	43	struct clk *clk;
3071efa4	44	struct notifier_block clk_rate_cb;
4a59058f MR	45	u32 ticks_per_jiffy;
	46	};
	47
3071efa4 MR	48	#define to_sun5i_timer(x) \
	49	container_of(x, struct sun5i_timer, clk_rate_cb)
	50
4a59058f MR	51	struct sun5i_timer_clksrc {
	52	struct sun5i_timer timer;
	53	struct clocksource clksrc;
	54	};
	55
	56	#define to_sun5i_timer_clksrc(x) \
	57	container_of(x, struct sun5i_timer_clksrc, clksrc)
	58
	59	struct sun5i_timer_clkevt {
	60	struct sun5i_timer timer;
	61	struct clock_event_device clkevt;
	62	};
	63
	64	#define to_sun5i_timer_clkevt(x) \
	65	container_of(x, struct sun5i_timer_clkevt, clkevt)
67905540 MR	66
	67	/*
	68	* When we disable a timer, we need to wait at least for 2 cycles of
	69	* the timer source clock. We will use for that the clocksource timer
	70	* that is already setup and runs at the same frequency than the other
	71	* timers, and we never will be disabled.
	72	*/
4a59058f	73	static void sun5i_clkevt_sync(struct sun5i_timer_clkevt *ce)
67905540	74	{
4a59058f	75	u32 old = readl(ce->timer.base + TIMER_CNTVAL_LO_REG(1));
67905540	76
4a59058f	77	while ((old - readl(ce->timer.base + TIMER_CNTVAL_LO_REG(1))) < TIMER_SYNC_TICKS)
67905540 MR	78	cpu_relax();
	79	}
	80
4a59058f	81	static void sun5i_clkevt_time_stop(struct sun5i_timer_clkevt *ce, u8 timer)
67905540	82	{
4a59058f MR	83	u32 val = readl(ce->timer.base + TIMER_CTL_REG(timer));
4a59058f MR	84	writel(val & ~TIMER_CTL_ENABLE, ce->timer.base + TIMER_CTL_REG(timer));
67905540	85
4a59058f	86	sun5i_clkevt_sync(ce);
67905540 MR	87	}
67905540 MR	88
4a59058f	89	static void sun5i_clkevt_time_setup(struct sun5i_timer_clkevt *ce, u8 timer, u32 delay)
67905540	90	{
4a59058f	91	writel(delay, ce->timer.base + TIMER_INTVAL_LO_REG(timer));
67905540 MR	92	}
67905540 MR	93
4a59058f	94	static void sun5i_clkevt_time_start(struct sun5i_timer_clkevt *ce, u8 timer, bool periodic)
67905540	95	{
4a59058f	96	u32 val = readl(ce->timer.base + TIMER_CTL_REG(timer));
67905540 MR	97
	98	if (periodic)
	99	val &= ~TIMER_CTL_ONESHOT;
	100	else
	101	val \|= TIMER_CTL_ONESHOT;
	102
	103	writel(val \| TIMER_CTL_ENABLE \| TIMER_CTL_RELOAD,
4a59058f	104	ce->timer.base + TIMER_CTL_REG(timer));
67905540 MR	105	}
67905540 MR	106
7486f5ad	107	static int sun5i_clkevt_shutdown(struct clock_event_device *clkevt)
67905540	108	{
4a59058f MR	109	struct sun5i_timer_clkevt *ce = to_sun5i_timer_clkevt(clkevt);
4a59058f MR	110
7486f5ad VK	111	sun5i_clkevt_time_stop(ce, 0);
	112	return 0;
	113	}
	114
	115	static int sun5i_clkevt_set_oneshot(struct clock_event_device *clkevt)
	116	{
	117	struct sun5i_timer_clkevt *ce = to_sun5i_timer_clkevt(clkevt);
	118
	119	sun5i_clkevt_time_stop(ce, 0);
	120	sun5i_clkevt_time_start(ce, 0, false);
	121	return 0;
	122	}
	123
	124	static int sun5i_clkevt_set_periodic(struct clock_event_device *clkevt)
	125	{
	126	struct sun5i_timer_clkevt *ce = to_sun5i_timer_clkevt(clkevt);
	127
	128	sun5i_clkevt_time_stop(ce, 0);
	129	sun5i_clkevt_time_setup(ce, 0, ce->timer.ticks_per_jiffy);
	130	sun5i_clkevt_time_start(ce, 0, true);
	131	return 0;
67905540 MR	132	}
	133
	134	static int sun5i_clkevt_next_event(unsigned long evt,
4a59058f	135	struct clock_event_device *clkevt)
67905540	136	{
4a59058f MR	137	struct sun5i_timer_clkevt *ce = to_sun5i_timer_clkevt(clkevt);
	138
	139	sun5i_clkevt_time_stop(ce, 0);
	140	sun5i_clkevt_time_setup(ce, 0, evt - TIMER_SYNC_TICKS);
	141	sun5i_clkevt_time_start(ce, 0, false);
67905540 MR	142
	143	return 0;
	144	}
	145
67905540 MR	146	static irqreturn_t sun5i_timer_interrupt(int irq, void *dev_id)
67905540 MR	147	{
4a59058f	148	struct sun5i_timer_clkevt ce = (struct sun5i_timer_clkevt )dev_id;
67905540	149
4a59058f MR	150	writel(0x1, ce->timer.base + TIMER_IRQ_ST_REG);
4a59058f MR	151	ce->clkevt.event_handler(&ce->clkevt);
67905540 MR	152
	153	return IRQ_HANDLED;
	154	}
	155
a5a1d1c2	156	static u64 sun5i_clksrc_read(struct clocksource *clksrc)
59387683 CYT	157	{
	158	struct sun5i_timer_clksrc *cs = to_sun5i_timer_clksrc(clksrc);
	159
	160	return ~readl(cs->timer.base + TIMER_CNTVAL_LO_REG(1));
	161	}
	162
3071efa4 MR	163	static int sun5i_rate_cb_clksrc(struct notifier_block *nb,
	164	unsigned long event, void *data)
	165	{
	166	struct clk_notifier_data *ndata = data;
	167	struct sun5i_timer *timer = to_sun5i_timer(nb);
	168	struct sun5i_timer_clksrc *cs = container_of(timer, struct sun5i_timer_clksrc, timer);
	169
	170	switch (event) {
	171	case PRE_RATE_CHANGE:
	172	clocksource_unregister(&cs->clksrc);
	173	break;
	174
	175	case POST_RATE_CHANGE:
	176	clocksource_register_hz(&cs->clksrc, ndata->new_rate);
	177	break;
	178
	179	default:
	180	break;
	181	}
	182
	183	return NOTIFY_DONE;
	184	}
	185
4a59058f MR	186	static int __init sun5i_setup_clocksource(struct device_node *node,
	187	void __iomem *base,
	188	struct clk *clk, int irq)
	189	{
	190	struct sun5i_timer_clksrc *cs;
	191	unsigned long rate;
	192	int ret;
	193
	194	cs = kzalloc(sizeof(*cs), GFP_KERNEL);
	195	if (!cs)
	196	return -ENOMEM;
	197
	198	ret = clk_prepare_enable(clk);
	199	if (ret) {
	200	pr_err("Couldn't enable parent clock\n");
	201	goto err_free;
	202	}
	203
	204	rate = clk_get_rate(clk);
cc423232 CYT	205	if (!rate) {
	206	pr_err("Couldn't get parent clock rate\n");
	207	ret = -EINVAL;
	208	goto err_disable_clk;
	209	}
4a59058f MR	210
	211	cs->timer.base = base;
	212	cs->timer.clk = clk;
3071efa4 MR	213	cs->timer.clk_rate_cb.notifier_call = sun5i_rate_cb_clksrc;
	214	cs->timer.clk_rate_cb.next = NULL;
	215
	216	ret = clk_notifier_register(clk, &cs->timer.clk_rate_cb);
	217	if (ret) {
	218	pr_err("Unable to register clock notifier.\n");
	219	goto err_disable_clk;
	220	}
4a59058f MR	221
	222	writel(~0, base + TIMER_INTVAL_LO_REG(1));
	223	writel(TIMER_CTL_ENABLE \| TIMER_CTL_RELOAD,
	224	base + TIMER_CTL_REG(1));
	225
59387683 CYT	226	cs->clksrc.name = node->name;
	227	cs->clksrc.rating = 340;
	228	cs->clksrc.read = sun5i_clksrc_read;
	229	cs->clksrc.mask = CLOCKSOURCE_MASK(32);
	230	cs->clksrc.flags = CLOCK_SOURCE_IS_CONTINUOUS;
	231
	232	ret = clocksource_register_hz(&cs->clksrc, rate);
4a59058f MR	233	if (ret) {
4a59058f MR	234	pr_err("Couldn't register clock source.\n");
3071efa4	235	goto err_remove_notifier;
4a59058f MR	236	}
	237
	238	return 0;
	239
3071efa4 MR	240	err_remove_notifier:
3071efa4 MR	241	clk_notifier_unregister(clk, &cs->timer.clk_rate_cb);
4a59058f MR	242	err_disable_clk:
	243	clk_disable_unprepare(clk);
	244	err_free:
	245	kfree(cs);
	246	return ret;
	247	}
	248
3071efa4 MR	249	static int sun5i_rate_cb_clkevt(struct notifier_block *nb,
	250	unsigned long event, void *data)
	251	{
	252	struct clk_notifier_data *ndata = data;
	253	struct sun5i_timer *timer = to_sun5i_timer(nb);
	254	struct sun5i_timer_clkevt *ce = container_of(timer, struct sun5i_timer_clkevt, timer);
	255
	256	if (event == POST_RATE_CHANGE) {
	257	clockevents_update_freq(&ce->clkevt, ndata->new_rate);
	258	ce->timer.ticks_per_jiffy = DIV_ROUND_UP(ndata->new_rate, HZ);
	259	}
	260
	261	return NOTIFY_DONE;
	262	}
	263
4a59058f MR	264	static int __init sun5i_setup_clockevent(struct device_node node, void __iomem base,
	265	struct clk *clk, int irq)
	266	{
	267	struct sun5i_timer_clkevt *ce;
	268	unsigned long rate;
	269	int ret;
	270	u32 val;
	271
	272	ce = kzalloc(sizeof(*ce), GFP_KERNEL);
	273	if (!ce)
	274	return -ENOMEM;
	275
	276	ret = clk_prepare_enable(clk);
	277	if (ret) {
	278	pr_err("Couldn't enable parent clock\n");
	279	goto err_free;
	280	}
	281
	282	rate = clk_get_rate(clk);
cc423232 CYT	283	if (!rate) {
	284	pr_err("Couldn't get parent clock rate\n");
	285	ret = -EINVAL;
	286	goto err_disable_clk;
	287	}
4a59058f MR	288
	289	ce->timer.base = base;
	290	ce->timer.ticks_per_jiffy = DIV_ROUND_UP(rate, HZ);
	291	ce->timer.clk = clk;
3071efa4 MR	292	ce->timer.clk_rate_cb.notifier_call = sun5i_rate_cb_clkevt;
	293	ce->timer.clk_rate_cb.next = NULL;
	294
	295	ret = clk_notifier_register(clk, &ce->timer.clk_rate_cb);
	296	if (ret) {
	297	pr_err("Unable to register clock notifier.\n");
	298	goto err_disable_clk;
	299	}
4a59058f MR	300
	301	ce->clkevt.name = node->name;
	302	ce->clkevt.features = CLOCK_EVT_FEAT_PERIODIC \| CLOCK_EVT_FEAT_ONESHOT;
	303	ce->clkevt.set_next_event = sun5i_clkevt_next_event;
7486f5ad VK	304	ce->clkevt.set_state_shutdown = sun5i_clkevt_shutdown;
	305	ce->clkevt.set_state_periodic = sun5i_clkevt_set_periodic;
	306	ce->clkevt.set_state_oneshot = sun5i_clkevt_set_oneshot;
	307	ce->clkevt.tick_resume = sun5i_clkevt_shutdown;
4a59058f MR	308	ce->clkevt.rating = 340;
	309	ce->clkevt.irq = irq;
	310	ce->clkevt.cpumask = cpu_possible_mask;
	311
	312	/* Enable timer0 interrupt */
	313	val = readl(base + TIMER_IRQ_EN_REG);
	314	writel(val \| TIMER_IRQ_EN(0), base + TIMER_IRQ_EN_REG);
	315
	316	clockevents_config_and_register(&ce->clkevt, rate,
	317	TIMER_SYNC_TICKS, 0xffffffff);
	318
	319	ret = request_irq(irq, sun5i_timer_interrupt, IRQF_TIMER \| IRQF_IRQPOLL,
	320	"sun5i_timer0", ce);
	321	if (ret) {
	322	pr_err("Unable to register interrupt\n");
3071efa4	323	goto err_remove_notifier;
4a59058f MR	324	}
	325
	326	return 0;
	327
3071efa4 MR	328	err_remove_notifier:
3071efa4 MR	329	clk_notifier_unregister(clk, &ce->timer.clk_rate_cb);
4a59058f MR	330	err_disable_clk:
	331	clk_disable_unprepare(clk);
	332	err_free:
	333	kfree(ce);
	334	return ret;
	335	}
	336
e4d9f2ee	337	static int __init sun5i_timer_init(struct device_node *node)
67905540	338	{
e50a00be	339	struct reset_control *rstc;
4a59058f	340	void __iomem *timer_base;
67905540	341	struct clk *clk;
e4d9f2ee	342	int irq, ret;
67905540	343
a45860d0	344	timer_base = of_io_request_and_map(node, 0, of_node_full_name(node));
e4d9f2ee	345	if (IS_ERR(timer_base)) {
ac9ce6d1	346	pr_err("Can't map registers\n");
e4d9f2ee DL	347	return PTR_ERR(timer_base);;
e4d9f2ee DL	348	}
67905540 MR	349
67905540 MR	350	irq = irq_of_parse_and_map(node, 0);
e4d9f2ee	351	if (irq <= 0) {
ac9ce6d1	352	pr_err("Can't parse IRQ\n");
e4d9f2ee DL	353	return -EINVAL;
e4d9f2ee DL	354	}
67905540 MR	355
67905540 MR	356	clk = of_clk_get(node, 0);
e4d9f2ee	357	if (IS_ERR(clk)) {
ac9ce6d1	358	pr_err("Can't get timer clock\n");
e4d9f2ee DL	359	return PTR_ERR(clk);
e4d9f2ee DL	360	}
67905540	361
e50a00be MR	362	rstc = of_reset_control_get(node, NULL);
	363	if (!IS_ERR(rstc))
	364	reset_control_deassert(rstc);
	365
e4d9f2ee DL	366	ret = sun5i_setup_clocksource(node, timer_base, clk, irq);
	367	if (ret)
	368	return ret;
	369
	370	return sun5i_setup_clockevent(node, timer_base, clk, irq);
67905540	371	}
17273395	372	TIMER_OF_DECLARE(sun5i_a13, "allwinner,sun5i-a13-hstimer",
e4d9f2ee	373	sun5i_timer_init);
17273395	374	TIMER_OF_DECLARE(sun7i_a20, "allwinner,sun7i-a20-hstimer",
e4d9f2ee	375	sun5i_timer_init);