[mirror_ubuntu-jammy-kernel.git] / drivers / clocksource / timer-meson6.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Amlogic Meson6 SoCs timer handling.
 *
 * Copyright (C) 2014 Carlo Caione <carlo@caione.org>
 *
 * Based on code from Amlogic, Inc
 */

#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/clockchips.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqreturn.h>
#include <linux/sched_clock.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>

#ifdef CONFIG_ARM
#include <linux/delay.h>
#endif

#define MESON_ISA_TIMER_MUX					0x00
#define MESON_ISA_TIMER_MUX_TIMERD_EN				BIT(19)
#define MESON_ISA_TIMER_MUX_TIMERC_EN				BIT(18)
#define MESON_ISA_TIMER_MUX_TIMERB_EN				BIT(17)
#define MESON_ISA_TIMER_MUX_TIMERA_EN				BIT(16)
#define MESON_ISA_TIMER_MUX_TIMERD_MODE				BIT(15)
#define MESON_ISA_TIMER_MUX_TIMERC_MODE				BIT(14)
#define MESON_ISA_TIMER_MUX_TIMERB_MODE				BIT(13)
#define MESON_ISA_TIMER_MUX_TIMERA_MODE				BIT(12)
#define MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_MASK		GENMASK(10, 8)
#define MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_SYSTEM_CLOCK	0x0
#define MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_1US		0x1
#define MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_10US		0x2
#define MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_100US		0x3
#define MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_1MS		0x4
#define MESON_ISA_TIMER_MUX_TIMERD_INPUT_CLOCK_MASK		GENMASK(7, 6)
#define MESON_ISA_TIMER_MUX_TIMERC_INPUT_CLOCK_MASK		GENMASK(5, 4)
#define MESON_ISA_TIMER_MUX_TIMERB_INPUT_CLOCK_MASK		GENMASK(3, 2)
#define MESON_ISA_TIMER_MUX_TIMERA_INPUT_CLOCK_MASK		GENMASK(1, 0)
#define MESON_ISA_TIMER_MUX_TIMERABCD_INPUT_CLOCK_1US		0x0
#define MESON_ISA_TIMER_MUX_TIMERABCD_INPUT_CLOCK_10US		0x1
#define MESON_ISA_TIMER_MUX_TIMERABCD_INPUT_CLOCK_100US		0x0
#define MESON_ISA_TIMER_MUX_TIMERABCD_INPUT_CLOCK_1MS		0x3

#define MESON_ISA_TIMERA					0x04
#define MESON_ISA_TIMERB					0x08
#define MESON_ISA_TIMERC					0x0c
#define MESON_ISA_TIMERD					0x10
#define MESON_ISA_TIMERE					0x14

static void __iomem *timer_base;

#ifdef CONFIG_ARM
static unsigned long meson6_read_current_timer(void)
{
	return readl_relaxed(timer_base + MESON_ISA_TIMERE);
}

static struct delay_timer meson6_delay_timer = {
	.read_current_timer = meson6_read_current_timer,
	.freq = 1000 * 1000,
};
#endif

static u64 notrace meson6_timer_sched_read(void)
{
	return (u64)readl(timer_base + MESON_ISA_TIMERE);
}

static void meson6_clkevt_time_stop(void)
{
	u32 val = readl(timer_base + MESON_ISA_TIMER_MUX);

	writel(val & ~MESON_ISA_TIMER_MUX_TIMERA_EN,
	       timer_base + MESON_ISA_TIMER_MUX);
}

static void meson6_clkevt_time_setup(unsigned long delay)
{
	writel(delay, timer_base + MESON_ISA_TIMERA);
}

static void meson6_clkevt_time_start(bool periodic)
{
	u32 val = readl(timer_base + MESON_ISA_TIMER_MUX);

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

	writel(val | MESON_ISA_TIMER_MUX_TIMERA_EN,
	       timer_base + MESON_ISA_TIMER_MUX);
}

static int meson6_shutdown(struct clock_event_device *evt)
{
	meson6_clkevt_time_stop();
	return 0;
}

static int meson6_set_oneshot(struct clock_event_device *evt)
{
	meson6_clkevt_time_stop();
	meson6_clkevt_time_start(false);
	return 0;
}

static int meson6_set_periodic(struct clock_event_device *evt)
{
	meson6_clkevt_time_stop();
	meson6_clkevt_time_setup(USEC_PER_SEC / HZ - 1);
	meson6_clkevt_time_start(true);
	return 0;
}

static int meson6_clkevt_next_event(unsigned long evt,
				    struct clock_event_device *unused)
{
	meson6_clkevt_time_stop();
	meson6_clkevt_time_setup(evt);
	meson6_clkevt_time_start(false);

	return 0;
}

static struct clock_event_device meson6_clockevent = {
	.name			= "meson6_tick",
	.rating			= 400,
	.features		= CLOCK_EVT_FEAT_PERIODIC |
				  CLOCK_EVT_FEAT_ONESHOT,
	.set_state_shutdown	= meson6_shutdown,
	.set_state_periodic	= meson6_set_periodic,
	.set_state_oneshot	= meson6_set_oneshot,
	.tick_resume		= meson6_shutdown,
	.set_next_event		= meson6_clkevt_next_event,
};

static irqreturn_t meson6_timer_interrupt(int irq, void *dev_id)
{
	struct clock_event_device *evt = (struct clock_event_device *)dev_id;

	evt->event_handler(evt);

	return IRQ_HANDLED;
}

static int __init meson6_timer_init(struct device_node *node)
{
	u32 val;
	int ret, irq;

	timer_base = of_io_request_and_map(node, 0, "meson6-timer");
	if (IS_ERR(timer_base)) {
		pr_err("Can't map registers\n");
		return -ENXIO;
	}

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

	/* Set 1us for timer E */
	val = readl(timer_base + MESON_ISA_TIMER_MUX);
	val &= ~MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_MASK;
	val |= FIELD_PREP(MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_MASK,
			  MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_1US);
	writel(val, timer_base + MESON_ISA_TIMER_MUX);

	sched_clock_register(meson6_timer_sched_read, 32, USEC_PER_SEC);
	clocksource_mmio_init(timer_base + MESON_ISA_TIMERE, node->name,
			      1000 * 1000, 300, 32, clocksource_mmio_readl_up);

	/* Timer A base 1us */
	val &= ~MESON_ISA_TIMER_MUX_TIMERA_INPUT_CLOCK_MASK;
	val |= FIELD_PREP(MESON_ISA_TIMER_MUX_TIMERA_INPUT_CLOCK_MASK,
			  MESON_ISA_TIMER_MUX_TIMERABCD_INPUT_CLOCK_1US);
	writel(val, timer_base + MESON_ISA_TIMER_MUX);

	/* Stop the timer A */
	meson6_clkevt_time_stop();

	ret = request_irq(irq, meson6_timer_interrupt,
			  IRQF_TIMER | IRQF_IRQPOLL, "meson6_timer",
			  &meson6_clockevent);
	if (ret) {
		pr_warn("failed to setup irq %d\n", irq);
		return ret;
	}

	meson6_clockevent.cpumask = cpu_possible_mask;
	meson6_clockevent.irq = irq;

	clockevents_config_and_register(&meson6_clockevent, USEC_PER_SEC,
					1, 0xfffe);

#ifdef CONFIG_ARM
	/* Also use MESON_ISA_TIMERE for delays */
	register_current_timer_delay(&meson6_delay_timer);
#endif

	return 0;
}
TIMER_OF_DECLARE(meson6, "amlogic,meson6-timer",
		       meson6_timer_init);
Commit	Line	Data
91d59bdf	1	// SPDX-License-Identifier: GPL-2.0
e4a6b378 CC	2	/*
	3	* Amlogic Meson6 SoCs timer handling.
	4	*
	5	* Copyright (C) 2014 Carlo Caione <carlo@caione.org>
	6	*
	7	* Based on code from Amlogic, Inc
e4a6b378 CC	8	*/
e4a6b378 CC	9
bed8fc13 MB	10	#include <linux/bitfield.h>
bed8fc13 MB	11	#include <linux/bitops.h>
e4a6b378 CC	12	#include <linux/clk.h>
	13	#include <linux/clockchips.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/irq.h>
	16	#include <linux/irqreturn.h>
	17	#include <linux/sched_clock.h>
	18	#include <linux/of.h>
	19	#include <linux/of_address.h>
	20	#include <linux/of_irq.h>
	21
fa83c6f4 MB	22	#ifdef CONFIG_ARM
	23	#include <linux/delay.h>
	24	#endif
	25
bed8fc13 MB	26	#define MESON_ISA_TIMER_MUX 0x00
	27	#define MESON_ISA_TIMER_MUX_TIMERD_EN BIT(19)
	28	#define MESON_ISA_TIMER_MUX_TIMERC_EN BIT(18)
	29	#define MESON_ISA_TIMER_MUX_TIMERB_EN BIT(17)
	30	#define MESON_ISA_TIMER_MUX_TIMERA_EN BIT(16)
	31	#define MESON_ISA_TIMER_MUX_TIMERD_MODE BIT(15)
	32	#define MESON_ISA_TIMER_MUX_TIMERC_MODE BIT(14)
	33	#define MESON_ISA_TIMER_MUX_TIMERB_MODE BIT(13)
	34	#define MESON_ISA_TIMER_MUX_TIMERA_MODE BIT(12)
	35	#define MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_MASK GENMASK(10, 8)
	36	#define MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_SYSTEM_CLOCK 0x0
	37	#define MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_1US 0x1
	38	#define MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_10US 0x2
	39	#define MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_100US 0x3
	40	#define MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_1MS 0x4
	41	#define MESON_ISA_TIMER_MUX_TIMERD_INPUT_CLOCK_MASK GENMASK(7, 6)
	42	#define MESON_ISA_TIMER_MUX_TIMERC_INPUT_CLOCK_MASK GENMASK(5, 4)
	43	#define MESON_ISA_TIMER_MUX_TIMERB_INPUT_CLOCK_MASK GENMASK(3, 2)
	44	#define MESON_ISA_TIMER_MUX_TIMERA_INPUT_CLOCK_MASK GENMASK(1, 0)
	45	#define MESON_ISA_TIMER_MUX_TIMERABCD_INPUT_CLOCK_1US 0x0
	46	#define MESON_ISA_TIMER_MUX_TIMERABCD_INPUT_CLOCK_10US 0x1
	47	#define MESON_ISA_TIMER_MUX_TIMERABCD_INPUT_CLOCK_100US 0x0
	48	#define MESON_ISA_TIMER_MUX_TIMERABCD_INPUT_CLOCK_1MS 0x3
	49
	50	#define MESON_ISA_TIMERA 0x04
	51	#define MESON_ISA_TIMERB 0x08
	52	#define MESON_ISA_TIMERC 0x0c
	53	#define MESON_ISA_TIMERD 0x10
	54	#define MESON_ISA_TIMERE 0x14
e4a6b378 CC	55
	56	static void __iomem *timer_base;
	57
fa83c6f4 MB	58	#ifdef CONFIG_ARM
	59	static unsigned long meson6_read_current_timer(void)
	60	{
	61	return readl_relaxed(timer_base + MESON_ISA_TIMERE);
	62	}
	63
	64	static struct delay_timer meson6_delay_timer = {
	65	.read_current_timer = meson6_read_current_timer,
	66	.freq = 1000 * 1000,
	67	};
	68	#endif
	69
e4a6b378 CC	70	static u64 notrace meson6_timer_sched_read(void)
e4a6b378 CC	71	{
bed8fc13	72	return (u64)readl(timer_base + MESON_ISA_TIMERE);
e4a6b378 CC	73	}
e4a6b378 CC	74
bed8fc13	75	static void meson6_clkevt_time_stop(void)
e4a6b378	76	{
bed8fc13	77	u32 val = readl(timer_base + MESON_ISA_TIMER_MUX);
e4a6b378	78
bed8fc13 MB	79	writel(val & ~MESON_ISA_TIMER_MUX_TIMERA_EN,
bed8fc13 MB	80	timer_base + MESON_ISA_TIMER_MUX);
e4a6b378 CC	81	}
e4a6b378 CC	82
bed8fc13	83	static void meson6_clkevt_time_setup(unsigned long delay)
e4a6b378	84	{
bed8fc13	85	writel(delay, timer_base + MESON_ISA_TIMERA);
e4a6b378 CC	86	}
e4a6b378 CC	87
bed8fc13	88	static void meson6_clkevt_time_start(bool periodic)
e4a6b378	89	{
bed8fc13	90	u32 val = readl(timer_base + MESON_ISA_TIMER_MUX);
e4a6b378 CC	91
e4a6b378 CC	92	if (periodic)
bed8fc13	93	val \|= MESON_ISA_TIMER_MUX_TIMERA_MODE;
e4a6b378	94	else
bed8fc13	95	val &= ~MESON_ISA_TIMER_MUX_TIMERA_MODE;
e4a6b378	96
bed8fc13 MB	97	writel(val \| MESON_ISA_TIMER_MUX_TIMERA_EN,
bed8fc13 MB	98	timer_base + MESON_ISA_TIMER_MUX);
e4a6b378 CC	99	}
e4a6b378 CC	100
40117bd5	101	static int meson6_shutdown(struct clock_event_device *evt)
e4a6b378	102	{
bed8fc13	103	meson6_clkevt_time_stop();
40117bd5 VK	104	return 0;
	105	}
	106
	107	static int meson6_set_oneshot(struct clock_event_device *evt)
	108	{
bed8fc13 MB	109	meson6_clkevt_time_stop();
bed8fc13 MB	110	meson6_clkevt_time_start(false);
40117bd5 VK	111	return 0;
	112	}
	113
	114	static int meson6_set_periodic(struct clock_event_device *evt)
	115	{
bed8fc13 MB	116	meson6_clkevt_time_stop();
	117	meson6_clkevt_time_setup(USEC_PER_SEC / HZ - 1);
	118	meson6_clkevt_time_start(true);
40117bd5	119	return 0;
e4a6b378 CC	120	}
	121
	122	static int meson6_clkevt_next_event(unsigned long evt,
	123	struct clock_event_device *unused)
	124	{
bed8fc13 MB	125	meson6_clkevt_time_stop();
	126	meson6_clkevt_time_setup(evt);
	127	meson6_clkevt_time_start(false);
e4a6b378 CC	128
	129	return 0;
	130	}
	131
	132	static struct clock_event_device meson6_clockevent = {
40117bd5 VK	133	.name = "meson6_tick",
	134	.rating = 400,
	135	.features = CLOCK_EVT_FEAT_PERIODIC \|
	136	CLOCK_EVT_FEAT_ONESHOT,
	137	.set_state_shutdown = meson6_shutdown,
	138	.set_state_periodic = meson6_set_periodic,
	139	.set_state_oneshot = meson6_set_oneshot,
	140	.tick_resume = meson6_shutdown,
	141	.set_next_event = meson6_clkevt_next_event,
e4a6b378 CC	142	};
	143
	144	static irqreturn_t meson6_timer_interrupt(int irq, void *dev_id)
	145	{
	146	struct clock_event_device evt = (struct clock_event_device )dev_id;
	147
	148	evt->event_handler(evt);
	149
	150	return IRQ_HANDLED;
	151	}
	152
ca46acb9	153	static int __init meson6_timer_init(struct device_node *node)
e4a6b378 CC	154	{
	155	u32 val;
	156	int ret, irq;
	157
	158	timer_base = of_io_request_and_map(node, 0, "meson6-timer");
ca46acb9	159	if (IS_ERR(timer_base)) {
ac9ce6d1	160	pr_err("Can't map registers\n");
ca46acb9 DL	161	return -ENXIO;
ca46acb9 DL	162	}
e4a6b378 CC	163
e4a6b378 CC	164	irq = irq_of_parse_and_map(node, 0);
ca46acb9	165	if (irq <= 0) {
ac9ce6d1	166	pr_err("Can't parse IRQ\n");
ca46acb9 DL	167	return -EINVAL;
ca46acb9 DL	168	}
e4a6b378 CC	169
e4a6b378 CC	170	/* Set 1us for timer E */
bed8fc13 MB	171	val = readl(timer_base + MESON_ISA_TIMER_MUX);
	172	val &= ~MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_MASK;
	173	val \|= FIELD_PREP(MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_MASK,
	174	MESON_ISA_TIMER_MUX_TIMERE_INPUT_CLOCK_1US);
	175	writel(val, timer_base + MESON_ISA_TIMER_MUX);
e4a6b378 CC	176
e4a6b378 CC	177	sched_clock_register(meson6_timer_sched_read, 32, USEC_PER_SEC);
bed8fc13	178	clocksource_mmio_init(timer_base + MESON_ISA_TIMERE, node->name,
e4a6b378 CC	179	1000 * 1000, 300, 32, clocksource_mmio_readl_up);
	180
	181	/* Timer A base 1us */
bed8fc13 MB	182	val &= ~MESON_ISA_TIMER_MUX_TIMERA_INPUT_CLOCK_MASK;
	183	val \|= FIELD_PREP(MESON_ISA_TIMER_MUX_TIMERA_INPUT_CLOCK_MASK,
	184	MESON_ISA_TIMER_MUX_TIMERABCD_INPUT_CLOCK_1US);
	185	writel(val, timer_base + MESON_ISA_TIMER_MUX);
e4a6b378 CC	186
e4a6b378 CC	187	/* Stop the timer A */
bed8fc13	188	meson6_clkevt_time_stop();
e4a6b378	189
cc2550b4	190	ret = request_irq(irq, meson6_timer_interrupt,
	191	IRQF_TIMER \| IRQF_IRQPOLL, "meson6_timer",
	192	&meson6_clockevent);
ca46acb9	193	if (ret) {
e4a6b378	194	pr_warn("failed to setup irq %d\n", irq);
ca46acb9 DL	195	return ret;
ca46acb9 DL	196	}
e4a6b378 CC	197
	198	meson6_clockevent.cpumask = cpu_possible_mask;
	199	meson6_clockevent.irq = irq;
	200
	201	clockevents_config_and_register(&meson6_clockevent, USEC_PER_SEC,
	202	1, 0xfffe);
fa83c6f4 MB	203
	204	#ifdef CONFIG_ARM
	205	/* Also use MESON_ISA_TIMERE for delays */
	206	register_current_timer_delay(&meson6_delay_timer);
	207	#endif
	208
ca46acb9	209	return 0;
e4a6b378	210	}
17273395	211	TIMER_OF_DECLARE(meson6, "amlogic,meson6-timer",
e4a6b378	212	meson6_timer_init);