[mirror_ubuntu-artful-kernel.git] / arch / arm / kernel / smp_twd.c

/*
 *  linux/arch/arm/kernel/smp_twd.c
 *
 *  Copyright (C) 2002 ARM Ltd.
 *  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/kernel.h>
#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/smp.h>
#include <linux/jiffies.h>
#include <linux/clockchips.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>

#include <asm/smp_twd.h>

/* set up by the platform code */
static void __iomem *twd_base;

static struct clk *twd_clk;
static unsigned long twd_timer_rate;
static DEFINE_PER_CPU(bool, percpu_setup_called);

static struct clock_event_device __percpu *twd_evt;
static unsigned int twd_features =
		CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
static int twd_ppi;

static int twd_shutdown(struct clock_event_device *clk)
{
	writel_relaxed(0, twd_base + TWD_TIMER_CONTROL);
	return 0;
}

static int twd_set_oneshot(struct clock_event_device *clk)
{
	/* period set, and timer enabled in 'next_event' hook */
	writel_relaxed(TWD_TIMER_CONTROL_IT_ENABLE | TWD_TIMER_CONTROL_ONESHOT,
		       twd_base + TWD_TIMER_CONTROL);
	return 0;
}

static int twd_set_periodic(struct clock_event_device *clk)
{
	unsigned long ctrl = TWD_TIMER_CONTROL_ENABLE |
			     TWD_TIMER_CONTROL_IT_ENABLE |
			     TWD_TIMER_CONTROL_PERIODIC;

	writel_relaxed(DIV_ROUND_CLOSEST(twd_timer_rate, HZ),
		       twd_base + TWD_TIMER_LOAD);
	writel_relaxed(ctrl, twd_base + TWD_TIMER_CONTROL);
	return 0;
}

static int twd_set_next_event(unsigned long evt,
			struct clock_event_device *unused)
{
	unsigned long ctrl = readl_relaxed(twd_base + TWD_TIMER_CONTROL);

	ctrl |= TWD_TIMER_CONTROL_ENABLE;

	writel_relaxed(evt, twd_base + TWD_TIMER_COUNTER);
	writel_relaxed(ctrl, twd_base + TWD_TIMER_CONTROL);

	return 0;
}

/*
 * local_timer_ack: checks for a local timer interrupt.
 *
 * If a local timer interrupt has occurred, acknowledge and return 1.
 * Otherwise, return 0.
 */
static int twd_timer_ack(void)
{
	if (readl_relaxed(twd_base + TWD_TIMER_INTSTAT)) {
		writel_relaxed(1, twd_base + TWD_TIMER_INTSTAT);
		return 1;
	}

	return 0;
}

static void twd_timer_stop(void)
{
	struct clock_event_device *clk = raw_cpu_ptr(twd_evt);

	twd_shutdown(clk);
	disable_percpu_irq(clk->irq);
}

#ifdef CONFIG_COMMON_CLK

/*
 * Updates clockevent frequency when the cpu frequency changes.
 * Called on the cpu that is changing frequency with interrupts disabled.
 */
static void twd_update_frequency(void *new_rate)
{
	twd_timer_rate = *((unsigned long *) new_rate);

	clockevents_update_freq(raw_cpu_ptr(twd_evt), twd_timer_rate);
}

static int twd_rate_change(struct notifier_block *nb,
	unsigned long flags, void *data)
{
	struct clk_notifier_data *cnd = data;

	/*
	 * The twd clock events must be reprogrammed to account for the new
	 * frequency.  The timer is local to a cpu, so cross-call to the
	 * changing cpu.
	 */
	if (flags == POST_RATE_CHANGE)
		on_each_cpu(twd_update_frequency,
				  (void *)&cnd->new_rate, 1);

	return NOTIFY_OK;
}

static struct notifier_block twd_clk_nb = {
	.notifier_call = twd_rate_change,
};

static int twd_clk_init(void)
{
	if (twd_evt && raw_cpu_ptr(twd_evt) && !IS_ERR(twd_clk))
		return clk_notifier_register(twd_clk, &twd_clk_nb);

	return 0;
}
core_initcall(twd_clk_init);

#elif defined (CONFIG_CPU_FREQ)

#include <linux/cpufreq.h>

/*
 * Updates clockevent frequency when the cpu frequency changes.
 * Called on the cpu that is changing frequency with interrupts disabled.
 */
static void twd_update_frequency(void *data)
{
	twd_timer_rate = clk_get_rate(twd_clk);

	clockevents_update_freq(raw_cpu_ptr(twd_evt), twd_timer_rate);
}

static int twd_cpufreq_transition(struct notifier_block *nb,
	unsigned long state, void *data)
{
	struct cpufreq_freqs *freqs = data;

	/*
	 * The twd clock events must be reprogrammed to account for the new
	 * frequency.  The timer is local to a cpu, so cross-call to the
	 * changing cpu.
	 */
	if (state == CPUFREQ_POSTCHANGE)
		smp_call_function_single(freqs->cpu, twd_update_frequency,
			NULL, 1);

	return NOTIFY_OK;
}

static struct notifier_block twd_cpufreq_nb = {
	.notifier_call = twd_cpufreq_transition,
};

static int twd_cpufreq_init(void)
{
	if (twd_evt && raw_cpu_ptr(twd_evt) && !IS_ERR(twd_clk))
		return cpufreq_register_notifier(&twd_cpufreq_nb,
			CPUFREQ_TRANSITION_NOTIFIER);

	return 0;
}
core_initcall(twd_cpufreq_init);

#endif

static void twd_calibrate_rate(void)
{
	unsigned long count;
	u64 waitjiffies;

	/*
	 * If this is the first time round, we need to work out how fast
	 * the timer ticks
	 */
	if (twd_timer_rate == 0) {
		pr_info("Calibrating local timer... ");

		/* Wait for a tick to start */
		waitjiffies = get_jiffies_64() + 1;

		while (get_jiffies_64() < waitjiffies)
			udelay(10);

		/* OK, now the tick has started, let's get the timer going */
		waitjiffies += 5;

				 /* enable, no interrupt or reload */
		writel_relaxed(0x1, twd_base + TWD_TIMER_CONTROL);

				 /* maximum value */
		writel_relaxed(0xFFFFFFFFU, twd_base + TWD_TIMER_COUNTER);

		while (get_jiffies_64() < waitjiffies)
			udelay(10);

		count = readl_relaxed(twd_base + TWD_TIMER_COUNTER);

		twd_timer_rate = (0xFFFFFFFFU - count) * (HZ / 5);

		pr_cont("%lu.%02luMHz.\n", twd_timer_rate / 1000000,
			(twd_timer_rate / 10000) % 100);
	}
}

static irqreturn_t twd_handler(int irq, void *dev_id)
{
	struct clock_event_device *evt = dev_id;

	if (twd_timer_ack()) {
		evt->event_handler(evt);
		return IRQ_HANDLED;
	}

	return IRQ_NONE;
}

static void twd_get_clock(struct device_node *np)
{
	int err;

	if (np)
		twd_clk = of_clk_get(np, 0);
	else
		twd_clk = clk_get_sys("smp_twd", NULL);

	if (IS_ERR(twd_clk)) {
		pr_err("smp_twd: clock not found %d\n", (int) PTR_ERR(twd_clk));
		return;
	}

	err = clk_prepare_enable(twd_clk);
	if (err) {
		pr_err("smp_twd: clock failed to prepare+enable: %d\n", err);
		clk_put(twd_clk);
		return;
	}

	twd_timer_rate = clk_get_rate(twd_clk);
}

/*
 * Setup the local clock events for a CPU.
 */
static void twd_timer_setup(void)
{
	struct clock_event_device *clk = raw_cpu_ptr(twd_evt);
	int cpu = smp_processor_id();

	/*
	 * If the basic setup for this CPU has been done before don't
	 * bother with the below.
	 */
	if (per_cpu(percpu_setup_called, cpu)) {
		writel_relaxed(0, twd_base + TWD_TIMER_CONTROL);
		clockevents_register_device(clk);
		enable_percpu_irq(clk->irq, 0);
		return;
	}
	per_cpu(percpu_setup_called, cpu) = true;

	twd_calibrate_rate();

	/*
	 * The following is done once per CPU the first time .setup() is
	 * called.
	 */
	writel_relaxed(0, twd_base + TWD_TIMER_CONTROL);

	clk->name = "local_timer";
	clk->features = twd_features;
	clk->rating = 350;
	clk->set_state_shutdown = twd_shutdown;
	clk->set_state_periodic = twd_set_periodic;
	clk->set_state_oneshot = twd_set_oneshot;
	clk->tick_resume = twd_shutdown;
	clk->set_next_event = twd_set_next_event;
	clk->irq = twd_ppi;
	clk->cpumask = cpumask_of(cpu);

	clockevents_config_and_register(clk, twd_timer_rate,
					0xf, 0xffffffff);
	enable_percpu_irq(clk->irq, 0);
}

static int twd_timer_starting_cpu(unsigned int cpu)
{
	twd_timer_setup();
	return 0;
}

static int twd_timer_dying_cpu(unsigned int cpu)
{
	twd_timer_stop();
	return 0;
}

static int __init twd_local_timer_common_register(struct device_node *np)
{
	int err;

	twd_evt = alloc_percpu(struct clock_event_device);
	if (!twd_evt) {
		err = -ENOMEM;
		goto out_free;
	}

	err = request_percpu_irq(twd_ppi, twd_handler, "twd", twd_evt);
	if (err) {
		pr_err("twd: can't register interrupt %d (%d)\n", twd_ppi, err);
		goto out_free;
	}

	cpuhp_setup_state_nocalls(CPUHP_AP_ARM_TWD_STARTING,
				  "arm/timer/twd:starting",
				  twd_timer_starting_cpu, twd_timer_dying_cpu);

	twd_get_clock(np);
	if (!of_property_read_bool(np, "always-on"))
		twd_features |= CLOCK_EVT_FEAT_C3STOP;

	/*
	 * Immediately configure the timer on the boot CPU, unless we need
	 * jiffies to be incrementing to calibrate the rate in which case
	 * setup the timer in late_time_init.
	 */
	if (twd_timer_rate)
		twd_timer_setup();
	else
		late_time_init = twd_timer_setup;

	return 0;

out_free:
	iounmap(twd_base);
	twd_base = NULL;
	free_percpu(twd_evt);

	return err;
}

int __init twd_local_timer_register(struct twd_local_timer *tlt)
{
	if (twd_base || twd_evt)
		return -EBUSY;

	twd_ppi	= tlt->res[1].start;

	twd_base = ioremap(tlt->res[0].start, resource_size(&tlt->res[0]));
	if (!twd_base)
		return -ENOMEM;

	return twd_local_timer_common_register(NULL);
}

#ifdef CONFIG_OF
static int __init twd_local_timer_of_register(struct device_node *np)
{
	int err;

	twd_ppi = irq_of_parse_and_map(np, 0);
	if (!twd_ppi) {
		err = -EINVAL;
		goto out;
	}

	twd_base = of_iomap(np, 0);
	if (!twd_base) {
		err = -ENOMEM;
		goto out;
	}

	err = twd_local_timer_common_register(np);

out:
	WARN(err, "twd_local_timer_of_register failed (%d)\n", err);
	return err;
}
TIMER_OF_DECLARE(arm_twd_a9, "arm,cortex-a9-twd-timer", twd_local_timer_of_register);
TIMER_OF_DECLARE(arm_twd_a5, "arm,cortex-a5-twd-timer", twd_local_timer_of_register);
TIMER_OF_DECLARE(arm_twd_11mp, "arm,arm11mp-twd-timer", twd_local_timer_of_register);
#endif
Commit	Line	Data
f32f4ce2 RK	1	/*
	2	* linux/arch/arm/kernel/smp_twd.c
	3	*
	4	* Copyright (C) 2002 ARM Ltd.
	5	* All Rights Reserved
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/init.h>
	12	#include <linux/kernel.h>
5def51b0	13	#include <linux/clk.h>
a894fcc2	14	#include <linux/cpu.h>
f32f4ce2 RK	15	#include <linux/delay.h>
f32f4ce2 RK	16	#include <linux/device.h>
5def51b0	17	#include <linux/err.h>
f32f4ce2 RK	18	#include <linux/smp.h>
	19	#include <linux/jiffies.h>
	20	#include <linux/clockchips.h>
92485104	21	#include <linux/interrupt.h>
f32f4ce2	22	#include <linux/io.h>
d8e03643 MZ	23	#include <linux/of_irq.h>
d8e03643 MZ	24	#include <linux/of_address.h>
f32f4ce2 RK	25
f32f4ce2 RK	26	#include <asm/smp_twd.h>
f32f4ce2	27
f32f4ce2	28	/* set up by the platform code */
92485104	29	static void __iomem *twd_base;
f32f4ce2	30
5def51b0	31	static struct clk *twd_clk;
f32f4ce2	32	static unsigned long twd_timer_rate;
a68becd1	33	static DEFINE_PER_CPU(bool, percpu_setup_called);
f32f4ce2	34
a894fcc2	35	static struct clock_event_device __percpu *twd_evt;
e1b8c05d RK	36	static unsigned int twd_features =
e1b8c05d RK	37	CLOCK_EVT_FEAT_PERIODIC \| CLOCK_EVT_FEAT_ONESHOT;
81e46f7b	38	static int twd_ppi;
28af690a	39
5e253571	40	static int twd_shutdown(struct clock_event_device *clk)
f32f4ce2	41	{
5e253571 VK	42	writel_relaxed(0, twd_base + TWD_TIMER_CONTROL);
	43	return 0;
	44	}
f32f4ce2	45
5e253571 VK	46	static int twd_set_oneshot(struct clock_event_device *clk)
	47	{
	48	/* period set, and timer enabled in 'next_event' hook */
	49	writel_relaxed(TWD_TIMER_CONTROL_IT_ENABLE \| TWD_TIMER_CONTROL_ONESHOT,
	50	twd_base + TWD_TIMER_CONTROL);
	51	return 0;
	52	}
	53
	54	static int twd_set_periodic(struct clock_event_device *clk)
	55	{
	56	unsigned long ctrl = TWD_TIMER_CONTROL_ENABLE \|
	57	TWD_TIMER_CONTROL_IT_ENABLE \|
	58	TWD_TIMER_CONTROL_PERIODIC;
	59
	60	writel_relaxed(DIV_ROUND_CLOSEST(twd_timer_rate, HZ),
	61	twd_base + TWD_TIMER_LOAD);
2e874ea3	62	writel_relaxed(ctrl, twd_base + TWD_TIMER_CONTROL);
5e253571	63	return 0;
f32f4ce2 RK	64	}
	65
	66	static int twd_set_next_event(unsigned long evt,
	67	struct clock_event_device *unused)
	68	{
2e874ea3	69	unsigned long ctrl = readl_relaxed(twd_base + TWD_TIMER_CONTROL);
f32f4ce2	70
4c5158d4 RK	71	ctrl \|= TWD_TIMER_CONTROL_ENABLE;
4c5158d4 RK	72
2e874ea3 BD	73	writel_relaxed(evt, twd_base + TWD_TIMER_COUNTER);
2e874ea3 BD	74	writel_relaxed(ctrl, twd_base + TWD_TIMER_CONTROL);
f32f4ce2 RK	75
	76	return 0;
	77	}
	78
	79	/*
	80	* local_timer_ack: checks for a local timer interrupt.
	81	*
	82	* If a local timer interrupt has occurred, acknowledge and return 1.
	83	* Otherwise, return 0.
	84	*/
92485104	85	static int twd_timer_ack(void)
f32f4ce2	86	{
2e874ea3 BD	87	if (readl_relaxed(twd_base + TWD_TIMER_INTSTAT)) {
2e874ea3 BD	88	writel_relaxed(1, twd_base + TWD_TIMER_INTSTAT);
f32f4ce2 RK	89	return 1;
	90	}
	91
	92	return 0;
	93	}
	94
a894fcc2	95	static void twd_timer_stop(void)
28af690a	96	{
06b96c8b	97	struct clock_event_device *clk = raw_cpu_ptr(twd_evt);
a894fcc2	98
5e253571	99	twd_shutdown(clk);
28af690a MZ	100	disable_percpu_irq(clk->irq);
	101	}
	102
2b25d9f6 MT	103	#ifdef CONFIG_COMMON_CLK
	104
	105	/*
	106	* Updates clockevent frequency when the cpu frequency changes.
	107	* Called on the cpu that is changing frequency with interrupts disabled.
	108	*/
	109	static void twd_update_frequency(void *new_rate)
	110	{
	111	twd_timer_rate = ((unsigned long ) new_rate);
	112
06b96c8b	113	clockevents_update_freq(raw_cpu_ptr(twd_evt), twd_timer_rate);
2b25d9f6 MT	114	}
	115
	116	static int twd_rate_change(struct notifier_block *nb,
	117	unsigned long flags, void *data)
	118	{
	119	struct clk_notifier_data *cnd = data;
	120
	121	/*
	122	* The twd clock events must be reprogrammed to account for the new
	123	* frequency. The timer is local to a cpu, so cross-call to the
	124	* changing cpu.
	125	*/
	126	if (flags == POST_RATE_CHANGE)
cbbe6f82	127	on_each_cpu(twd_update_frequency,
2b25d9f6 MT	128	(void *)&cnd->new_rate, 1);
	129
	130	return NOTIFY_OK;
	131	}
	132
	133	static struct notifier_block twd_clk_nb = {
	134	.notifier_call = twd_rate_change,
	135	};
	136
	137	static int twd_clk_init(void)
	138	{
06b96c8b	139	if (twd_evt && raw_cpu_ptr(twd_evt) && !IS_ERR(twd_clk))
2b25d9f6 MT	140	return clk_notifier_register(twd_clk, &twd_clk_nb);
	141
	142	return 0;
	143	}
	144	core_initcall(twd_clk_init);
	145
	146	#elif defined (CONFIG_CPU_FREQ)
	147
	148	#include <linux/cpufreq.h>
4fd7f9b1 LW	149
	150	/*
	151	* Updates clockevent frequency when the cpu frequency changes.
	152	* Called on the cpu that is changing frequency with interrupts disabled.
	153	*/
	154	static void twd_update_frequency(void *data)
	155	{
	156	twd_timer_rate = clk_get_rate(twd_clk);
	157
06b96c8b	158	clockevents_update_freq(raw_cpu_ptr(twd_evt), twd_timer_rate);
4fd7f9b1 LW	159	}
	160
	161	static int twd_cpufreq_transition(struct notifier_block *nb,
	162	unsigned long state, void *data)
	163	{
	164	struct cpufreq_freqs *freqs = data;
	165
	166	/*
	167	* The twd clock events must be reprogrammed to account for the new
	168	* frequency. The timer is local to a cpu, so cross-call to the
	169	* changing cpu.
	170	*/
0b443ead	171	if (state == CPUFREQ_POSTCHANGE)
4fd7f9b1	172	smp_call_function_single(freqs->cpu, twd_update_frequency,
3cd88f99	173	NULL, 1);
4fd7f9b1 LW	174
	175	return NOTIFY_OK;
	176	}
	177
	178	static struct notifier_block twd_cpufreq_nb = {
	179	.notifier_call = twd_cpufreq_transition,
	180	};
	181
	182	static int twd_cpufreq_init(void)
	183	{
06b96c8b	184	if (twd_evt && raw_cpu_ptr(twd_evt) && !IS_ERR(twd_clk))
4fd7f9b1 LW	185	return cpufreq_register_notifier(&twd_cpufreq_nb,
	186	CPUFREQ_TRANSITION_NOTIFIER);
	187
	188	return 0;
	189	}
	190	core_initcall(twd_cpufreq_init);
	191
	192	#endif
	193
8bd26e3a	194	static void twd_calibrate_rate(void)
f32f4ce2	195	{
03399c1c	196	unsigned long count;
f32f4ce2 RK	197	u64 waitjiffies;
	198
	199	/*
	200	* If this is the first time round, we need to work out how fast
	201	* the timer ticks
	202	*/
	203	if (twd_timer_rate == 0) {
4ed89f22	204	pr_info("Calibrating local timer... ");
f32f4ce2 RK	205
	206	/* Wait for a tick to start */
	207	waitjiffies = get_jiffies_64() + 1;
	208
	209	while (get_jiffies_64() < waitjiffies)
	210	udelay(10);
	211
	212	/* OK, now the tick has started, let's get the timer going */
	213	waitjiffies += 5;
	214
	215	/* enable, no interrupt or reload */
2e874ea3	216	writel_relaxed(0x1, twd_base + TWD_TIMER_CONTROL);
f32f4ce2 RK	217
f32f4ce2 RK	218	/* maximum value */
2e874ea3	219	writel_relaxed(0xFFFFFFFFU, twd_base + TWD_TIMER_COUNTER);
f32f4ce2 RK	220
	221	while (get_jiffies_64() < waitjiffies)
	222	udelay(10);
	223
2e874ea3	224	count = readl_relaxed(twd_base + TWD_TIMER_COUNTER);
f32f4ce2 RK	225
	226	twd_timer_rate = (0xFFFFFFFFU - count) * (HZ / 5);
	227
4ed89f22	228	pr_cont("%lu.%02luMHz.\n", twd_timer_rate / 1000000,
90c5ffe5	229	(twd_timer_rate / 10000) % 100);
f32f4ce2	230	}
f32f4ce2 RK	231	}
f32f4ce2 RK	232
28af690a MZ	233	static irqreturn_t twd_handler(int irq, void *dev_id)
28af690a MZ	234	{
a894fcc2	235	struct clock_event_device *evt = dev_id;
28af690a MZ	236
	237	if (twd_timer_ack()) {
	238	evt->event_handler(evt);
	239	return IRQ_HANDLED;
	240	}
	241
	242	return IRQ_NONE;
	243	}
	244
bd603455	245	static void twd_get_clock(struct device_node *np)
5def51b0	246	{
5def51b0 LW	247	int err;
5def51b0 LW	248
bd603455 RH	249	if (np)
	250	twd_clk = of_clk_get(np, 0);
	251	else
	252	twd_clk = clk_get_sys("smp_twd", NULL);
	253
	254	if (IS_ERR(twd_clk)) {
	255	pr_err("smp_twd: clock not found %d\n", (int) PTR_ERR(twd_clk));
	256	return;
5def51b0 LW	257	}
5def51b0 LW	258
bd603455	259	err = clk_prepare_enable(twd_clk);
5def51b0	260	if (err) {
2577cf24	261	pr_err("smp_twd: clock failed to prepare+enable: %d\n", err);
bd603455 RH	262	clk_put(twd_clk);
bd603455 RH	263	return;
5def51b0 LW	264	}
5def51b0 LW	265
bd603455	266	twd_timer_rate = clk_get_rate(twd_clk);
5def51b0 LW	267	}
5def51b0 LW	268
f32f4ce2 RK	269	/*
	270	* Setup the local clock events for a CPU.
	271	*/
47dcd356	272	static void twd_timer_setup(void)
f32f4ce2	273	{
06b96c8b	274	struct clock_event_device *clk = raw_cpu_ptr(twd_evt);
a68becd1	275	int cpu = smp_processor_id();
28af690a	276
a68becd1 LW	277	/*
	278	* If the basic setup for this CPU has been done before don't
	279	* bother with the below.
	280	*/
	281	if (per_cpu(percpu_setup_called, cpu)) {
2e874ea3	282	writel_relaxed(0, twd_base + TWD_TIMER_CONTROL);
a894fcc2	283	clockevents_register_device(clk);
a68becd1	284	enable_percpu_irq(clk->irq, 0);
a894fcc2	285	return;
a68becd1 LW	286	}
a68becd1 LW	287	per_cpu(percpu_setup_called, cpu) = true;
28af690a	288
bd603455	289	twd_calibrate_rate();
f32f4ce2	290
a68becd1 LW	291	/*
	292	* The following is done once per CPU the first time .setup() is
	293	* called.
	294	*/
2e874ea3	295	writel_relaxed(0, twd_base + TWD_TIMER_CONTROL);
c214455f	296
4c5158d4	297	clk->name = "local_timer";
e1b8c05d	298	clk->features = twd_features;
4c5158d4	299	clk->rating = 350;
5e253571 VK	300	clk->set_state_shutdown = twd_shutdown;
	301	clk->set_state_periodic = twd_set_periodic;
	302	clk->set_state_oneshot = twd_set_oneshot;
	303	clk->tick_resume = twd_shutdown;
4c5158d4	304	clk->set_next_event = twd_set_next_event;
92485104	305	clk->irq = twd_ppi;
a894fcc2	306	clk->cpumask = cpumask_of(cpu);
28af690a	307
54d15b1d LW	308	clockevents_config_and_register(clk, twd_timer_rate,
54d15b1d LW	309	0xf, 0xffffffff);
28af690a	310	enable_percpu_irq(clk->irq, 0);
a894fcc2	311	}
81e46f7b	312
26b87688	313	static int twd_timer_starting_cpu(unsigned int cpu)
a894fcc2	314	{
26b87688 RC	315	twd_timer_setup();
26b87688 RC	316	return 0;
81e46f7b MZ	317	}
81e46f7b MZ	318
26b87688 RC	319	static int twd_timer_dying_cpu(unsigned int cpu)
	320	{
	321	twd_timer_stop();
	322	return 0;
	323	}
81e46f7b	324
bd603455	325	static int __init twd_local_timer_common_register(struct device_node *np)
81e46f7b MZ	326	{
	327	int err;
	328
a894fcc2	329	twd_evt = alloc_percpu(struct clock_event_device);
d8e03643	330	if (!twd_evt) {
81e46f7b	331	err = -ENOMEM;
d8e03643	332	goto out_free;
81e46f7b MZ	333	}
	334
	335	err = request_percpu_irq(twd_ppi, twd_handler, "twd", twd_evt);
	336	if (err) {
	337	pr_err("twd: can't register interrupt %d (%d)\n", twd_ppi, err);
d8e03643	338	goto out_free;
81e46f7b MZ	339	}
81e46f7b MZ	340
26b87688	341	cpuhp_setup_state_nocalls(CPUHP_AP_ARM_TWD_STARTING,
73c1b41e	342	"arm/timer/twd:starting",
26b87688	343	twd_timer_starting_cpu, twd_timer_dying_cpu);
81e46f7b	344
bd603455	345	twd_get_clock(np);
194444c5	346	if (!of_property_read_bool(np, "always-on"))
e1b8c05d	347	twd_features \|= CLOCK_EVT_FEAT_C3STOP;
bd603455	348
a894fcc2 SB	349	/*
	350	* Immediately configure the timer on the boot CPU, unless we need
	351	* jiffies to be incrementing to calibrate the rate in which case
	352	* setup the timer in late_time_init.
	353	*/
	354	if (twd_timer_rate)
	355	twd_timer_setup();
	356	else
	357	late_time_init = twd_timer_setup;
	358
81e46f7b MZ	359	return 0;
81e46f7b MZ	360
d8e03643	361	out_free:
81e46f7b	362	iounmap(twd_base);
d8e03643	363	twd_base = NULL;
81e46f7b	364	free_percpu(twd_evt);
d8e03643	365
81e46f7b	366	return err;
f32f4ce2	367	}
d8e03643 MZ	368
	369	int __init twd_local_timer_register(struct twd_local_timer *tlt)
	370	{
	371	if (twd_base \|\| twd_evt)
	372	return -EBUSY;
	373
	374	twd_ppi = tlt->res[1].start;
	375
	376	twd_base = ioremap(tlt->res[0].start, resource_size(&tlt->res[0]));
	377	if (!twd_base)
	378	return -ENOMEM;
	379
bd603455	380	return twd_local_timer_common_register(NULL);
d8e03643 MZ	381	}
	382
	383	#ifdef CONFIG_OF
dcbc0edd	384	static int __init twd_local_timer_of_register(struct device_node *np)
d8e03643	385	{
d8e03643 MZ	386	int err;
d8e03643 MZ	387
d8e03643 MZ	388	twd_ppi = irq_of_parse_and_map(np, 0);
	389	if (!twd_ppi) {
	390	err = -EINVAL;
	391	goto out;
	392	}
	393
	394	twd_base = of_iomap(np, 0);
	395	if (!twd_base) {
	396	err = -ENOMEM;
	397	goto out;
	398	}
	399
bd603455	400	err = twd_local_timer_common_register(np);
d8e03643 MZ	401
	402	out:
	403	WARN(err, "twd_local_timer_of_register failed (%d)\n", err);
dcbc0edd	404	return err;
d8e03643	405	}
17273395 DL	406	TIMER_OF_DECLARE(arm_twd_a9, "arm,cortex-a9-twd-timer", twd_local_timer_of_register);
	407	TIMER_OF_DECLARE(arm_twd_a5, "arm,cortex-a5-twd-timer", twd_local_timer_of_register);
	408	TIMER_OF_DECLARE(arm_twd_11mp, "arm,arm11mp-twd-timer", twd_local_timer_of_register);
d8e03643	409	#endif