[deliverable/linux.git] / arch / arm / mach-netx / time.c

/*
 * arch/arm/mach-netx/time.c
 *
 * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/io.h>

#include <mach/hardware.h>
#include <asm/mach/time.h>
#include <mach/netx-regs.h>

#define TIMER_CLOCKEVENT 0
#define TIMER_CLOCKSOURCE 1

static void netx_set_mode(enum clock_event_mode mode,
		struct clock_event_device *clk)
{
	u32 tmode;

	/* disable timer */
	writel(0, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKEVENT));

	switch (mode) {
	case CLOCK_EVT_MODE_PERIODIC:
		writel(LATCH, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKEVENT));
		tmode = NETX_GPIO_COUNTER_CTRL_RST_EN |
			NETX_GPIO_COUNTER_CTRL_IRQ_EN |
			NETX_GPIO_COUNTER_CTRL_RUN;
		break;

	case CLOCK_EVT_MODE_ONESHOT:
		writel(0, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKEVENT));
		tmode = NETX_GPIO_COUNTER_CTRL_IRQ_EN |
			NETX_GPIO_COUNTER_CTRL_RUN;
		break;

	default:
		WARN(1, "%s: unhandled mode %d\n", __func__, mode);
		/* fall through */

	case CLOCK_EVT_MODE_SHUTDOWN:
	case CLOCK_EVT_MODE_UNUSED:
	case CLOCK_EVT_MODE_RESUME:
		tmode = 0;
		break;
	}

	writel(tmode, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKEVENT));
}

static int netx_set_next_event(unsigned long evt,
		struct clock_event_device *clk)
{
	writel(0 - evt, NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKEVENT));
	return 0;
}

static struct clock_event_device netx_clockevent = {
	.name = "netx-timer" __stringify(TIMER_CLOCKEVENT),
	.shift = 32,
	.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
	.set_next_event = netx_set_next_event,
	.set_mode = netx_set_mode,
};

/*
 * IRQ handler for the timer
 */
static irqreturn_t
netx_timer_interrupt(int irq, void *dev_id)
{
	struct clock_event_device *evt = &netx_clockevent;

	/* acknowledge interrupt */
	writel(COUNTER_BIT(0), NETX_GPIO_IRQ);

	evt->event_handler(evt);

	return IRQ_HANDLED;
}

static struct irqaction netx_timer_irq = {
	.name		= "NetX Timer Tick",
	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
	.handler	= netx_timer_interrupt,
};

cycle_t netx_get_cycles(struct clocksource *cs)
{
	return readl(NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKSOURCE));
}

static struct clocksource clocksource_netx = {
	.name		= "netx_timer",
	.rating		= 200,
	.read		= netx_get_cycles,
	.mask		= CLOCKSOURCE_MASK(32),
	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
};

/*
 * Set up timer interrupt
 */
static void __init netx_timer_init(void)
{
	/* disable timer initially */
	writel(0, NETX_GPIO_COUNTER_CTRL(0));

	/* Reset the timer value to zero */
	writel(0, NETX_GPIO_COUNTER_CURRENT(0));

	writel(LATCH, NETX_GPIO_COUNTER_MAX(0));

	/* acknowledge interrupt */
	writel(COUNTER_BIT(0), NETX_GPIO_IRQ);

	/* Enable the interrupt in the specific timer
	 * register and start timer
	 */
	writel(COUNTER_BIT(0), NETX_GPIO_IRQ_ENABLE);
	writel(NETX_GPIO_COUNTER_CTRL_IRQ_EN | NETX_GPIO_COUNTER_CTRL_RUN,
			NETX_GPIO_COUNTER_CTRL(0));

	setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq);

	/* Setup timer one for clocksource */
	writel(0, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKSOURCE));
	writel(0, NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKSOURCE));
	writel(0xffffffff, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKSOURCE));

	writel(NETX_GPIO_COUNTER_CTRL_RUN,
			NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKSOURCE));

	clocksource_register_hz(&clocksource_netx, CLOCK_TICK_RATE);

	netx_clockevent.mult = div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC,
			netx_clockevent.shift);
	netx_clockevent.max_delta_ns =
		clockevent_delta2ns(0xfffffffe, &netx_clockevent);
	/* with max_delta_ns >= delta2ns(0x800) the system currently runs fine.
	 * Adding some safety ... */
	netx_clockevent.min_delta_ns =
		clockevent_delta2ns(0xa00, &netx_clockevent);
	netx_clockevent.cpumask = cpumask_of(0);
	clockevents_register_device(&netx_clockevent);
}

struct sys_timer netx_timer = {
	.init		= netx_timer_init,
};
Commit	Line	Data
bb6d8c88 SH	1	/*
	2	* arch/arm/mach-netx/time.c
	3	*
	4	* Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2
	8	* as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*/
	19
	20	#include <linux/init.h>
	21	#include <linux/interrupt.h>
1a815aed SH	22	#include <linux/irq.h>
1a815aed SH	23	#include <linux/clocksource.h>
2fcfe6b8	24	#include <linux/clockchips.h>
fced80c7	25	#include <linux/io.h>
bb6d8c88	26
a09e64fb	27	#include <mach/hardware.h>
bb6d8c88	28	#include <asm/mach/time.h>
a09e64fb	29	#include <mach/netx-regs.h>
bb6d8c88	30
2fcfe6b8	31	#define TIMER_CLOCKEVENT 0
24e78576 UKK	32	#define TIMER_CLOCKSOURCE 1
24e78576 UKK	33
2fcfe6b8 UKK	34	static void netx_set_mode(enum clock_event_mode mode,
	35	struct clock_event_device *clk)
	36	{
	37	u32 tmode;
	38
	39	/* disable timer */
	40	writel(0, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKEVENT));
	41
	42	switch (mode) {
	43	case CLOCK_EVT_MODE_PERIODIC:
	44	writel(LATCH, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKEVENT));
	45	tmode = NETX_GPIO_COUNTER_CTRL_RST_EN \|
	46	NETX_GPIO_COUNTER_CTRL_IRQ_EN \|
	47	NETX_GPIO_COUNTER_CTRL_RUN;
	48	break;
	49
	50	case CLOCK_EVT_MODE_ONESHOT:
	51	writel(0, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKEVENT));
	52	tmode = NETX_GPIO_COUNTER_CTRL_IRQ_EN \|
	53	NETX_GPIO_COUNTER_CTRL_RUN;
	54	break;
	55
	56	default:
	57	WARN(1, "%s: unhandled mode %d\n", __func__, mode);
	58	/* fall through */
	59
	60	case CLOCK_EVT_MODE_SHUTDOWN:
	61	case CLOCK_EVT_MODE_UNUSED:
	62	case CLOCK_EVT_MODE_RESUME:
	63	tmode = 0;
	64	break;
	65	}
	66
	67	writel(tmode, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKEVENT));
	68	}
	69
	70	static int netx_set_next_event(unsigned long evt,
	71	struct clock_event_device *clk)
	72	{
	73	writel(0 - evt, NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKEVENT));
	74	return 0;
	75	}
	76
	77	static struct clock_event_device netx_clockevent = {
	78	.name = "netx-timer" __stringify(TIMER_CLOCKEVENT),
	79	.shift = 32,
	80	.features = CLOCK_EVT_FEAT_PERIODIC \| CLOCK_EVT_FEAT_ONESHOT,
	81	.set_next_event = netx_set_next_event,
	82	.set_mode = netx_set_mode,
	83	};
	84
bb6d8c88 SH	85	/*
	86	* IRQ handler for the timer
	87	*/
	88	static irqreturn_t
0cd61b68	89	netx_timer_interrupt(int irq, void *dev_id)
bb6d8c88	90	{
2fcfe6b8	91	struct clock_event_device *evt = &netx_clockevent;
1a815aed	92
bb6d8c88 SH	93	/* acknowledge interrupt */
	94	writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
	95
2fcfe6b8 UKK	96	evt->event_handler(evt);
2fcfe6b8 UKK	97
bb6d8c88 SH	98	return IRQ_HANDLED;
	99	}
	100
bb6d8c88	101	static struct irqaction netx_timer_irq = {
98538488 UKK	102	.name = "NetX Timer Tick",
	103	.flags = IRQF_DISABLED \| IRQF_TIMER \| IRQF_IRQPOLL,
	104	.handler = netx_timer_interrupt,
bb6d8c88 SH	105	};
bb6d8c88 SH	106
8e19608e	107	cycle_t netx_get_cycles(struct clocksource *cs)
1a815aed	108	{
24e78576	109	return readl(NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKSOURCE));
1a815aed SH	110	}
	111
	112	static struct clocksource clocksource_netx = {
98538488	113	.name = "netx_timer",
1a815aed SH	114	.rating = 200,
	115	.read = netx_get_cycles,
	116	.mask = CLOCKSOURCE_MASK(32),
c66699a7	117	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
1a815aed SH	118	};
1a815aed SH	119
bb6d8c88 SH	120	/*
	121	* Set up timer interrupt
	122	*/
	123	static void __init netx_timer_init(void)
	124	{
	125	/* disable timer initially */
	126	writel(0, NETX_GPIO_COUNTER_CTRL(0));
	127
	128	/* Reset the timer value to zero */
	129	writel(0, NETX_GPIO_COUNTER_CURRENT(0));
	130
	131	writel(LATCH, NETX_GPIO_COUNTER_MAX(0));
	132
	133	/* acknowledge interrupt */
	134	writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
	135
98538488 UKK	136	/* Enable the interrupt in the specific timer
	137	* register and start timer
	138	*/
bb6d8c88 SH	139	writel(COUNTER_BIT(0), NETX_GPIO_IRQ_ENABLE);
bb6d8c88 SH	140	writel(NETX_GPIO_COUNTER_CTRL_IRQ_EN \| NETX_GPIO_COUNTER_CTRL_RUN,
98538488	141	NETX_GPIO_COUNTER_CTRL(0));
bb6d8c88 SH	142
bb6d8c88 SH	143	setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq);
1a815aed SH	144
1a815aed SH	145	/* Setup timer one for clocksource */
24e78576 UKK	146	writel(0, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKSOURCE));
	147	writel(0, NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKSOURCE));
	148	writel(0xffffffff, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKSOURCE));
1a815aed	149
98538488	150	writel(NETX_GPIO_COUNTER_CTRL_RUN,
24e78576	151	NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKSOURCE));
1a815aed	152
4f9272bf	153	clocksource_register_hz(&clocksource_netx, CLOCK_TICK_RATE);
2fcfe6b8 UKK	154
	155	netx_clockevent.mult = div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC,
	156	netx_clockevent.shift);
	157	netx_clockevent.max_delta_ns =
	158	clockevent_delta2ns(0xfffffffe, &netx_clockevent);
	159	/* with max_delta_ns >= delta2ns(0x800) the system currently runs fine.
	160	* Adding some safety ... */
	161	netx_clockevent.min_delta_ns =
	162	clockevent_delta2ns(0xa00, &netx_clockevent);
29279267	163	netx_clockevent.cpumask = cpumask_of(0);
2fcfe6b8	164	clockevents_register_device(&netx_clockevent);
bb6d8c88 SH	165	}
	166
	167	struct sys_timer netx_timer = {
1a815aed	168	.init = netx_timer_init,
bb6d8c88	169	};