[net-next-2.6.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 <mach/hardware.h>
#include <asm/io.h>
#include <asm/mach/time.h>
#include <mach/netx-regs.h>

/*
 * IRQ handler for the timer
 */
static irqreturn_t
netx_timer_interrupt(int irq, void *dev_id)
{
	timer_tick();

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

	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(void)
{
	return readl(NETX_GPIO_COUNTER_CURRENT(1));
}

static struct clocksource clocksource_netx = {
	.name 		= "netx_timer",
	.rating		= 200,
	.read		= netx_get_cycles,
	.mask		= CLOCKSOURCE_MASK(32),
	.shift 		= 20,
	.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(1));
        writel(0, NETX_GPIO_COUNTER_CURRENT(1));
        writel(0xFFFFFFFF, NETX_GPIO_COUNTER_MAX(1));

        writel(NETX_GPIO_COUNTER_CTRL_RUN,
                NETX_GPIO_COUNTER_CTRL(1));

	clocksource_netx.mult =
		clocksource_hz2mult(CLOCK_TICK_RATE, clocksource_netx.shift);
	clocksource_register(&clocksource_netx);
}

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>
bb6d8c88	24
a09e64fb	25	#include <mach/hardware.h>
bb6d8c88 SH	26	#include <asm/io.h>
bb6d8c88 SH	27	#include <asm/mach/time.h>
a09e64fb	28	#include <mach/netx-regs.h>
bb6d8c88	29
bb6d8c88 SH	30	/*
	31	* IRQ handler for the timer
	32	*/
	33	static irqreturn_t
0cd61b68	34	netx_timer_interrupt(int irq, void *dev_id)
bb6d8c88	35	{
0cd61b68	36	timer_tick();
1a815aed	37
bb6d8c88 SH	38	/* acknowledge interrupt */
	39	writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
	40
	41	return IRQ_HANDLED;
	42	}
	43
bb6d8c88 SH	44	static struct irqaction netx_timer_irq = {
bb6d8c88 SH	45	.name = "NetX Timer Tick",
b30fabad	46	.flags = IRQF_DISABLED \| IRQF_TIMER \| IRQF_IRQPOLL,
bb6d8c88 SH	47	.handler = netx_timer_interrupt,
	48	};
	49
1a815aed SH	50	cycle_t netx_get_cycles(void)
	51	{
	52	return readl(NETX_GPIO_COUNTER_CURRENT(1));
	53	}
	54
	55	static struct clocksource clocksource_netx = {
	56	.name = "netx_timer",
	57	.rating = 200,
	58	.read = netx_get_cycles,
	59	.mask = CLOCKSOURCE_MASK(32),
	60	.shift = 20,
c66699a7	61	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
1a815aed SH	62	};
1a815aed SH	63
bb6d8c88 SH	64	/*
	65	* Set up timer interrupt
	66	*/
	67	static void __init netx_timer_init(void)
	68	{
	69	/* disable timer initially */
	70	writel(0, NETX_GPIO_COUNTER_CTRL(0));
	71
	72	/* Reset the timer value to zero */
	73	writel(0, NETX_GPIO_COUNTER_CURRENT(0));
	74
	75	writel(LATCH, NETX_GPIO_COUNTER_MAX(0));
	76
	77	/* acknowledge interrupt */
	78	writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
	79
	80	/* Enable the interrupt in the specific timer register and start timer */
	81	writel(COUNTER_BIT(0), NETX_GPIO_IRQ_ENABLE);
	82	writel(NETX_GPIO_COUNTER_CTRL_IRQ_EN \| NETX_GPIO_COUNTER_CTRL_RUN,
	83	NETX_GPIO_COUNTER_CTRL(0));
	84
	85	setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq);
1a815aed SH	86
	87	/* Setup timer one for clocksource */
	88	writel(0, NETX_GPIO_COUNTER_CTRL(1));
	89	writel(0, NETX_GPIO_COUNTER_CURRENT(1));
	90	writel(0xFFFFFFFF, NETX_GPIO_COUNTER_MAX(1));
	91
	92	writel(NETX_GPIO_COUNTER_CTRL_RUN,
	93	NETX_GPIO_COUNTER_CTRL(1));
	94
	95	clocksource_netx.mult =
	96	clocksource_hz2mult(CLOCK_TICK_RATE, clocksource_netx.shift);
	97	clocksource_register(&clocksource_netx);
bb6d8c88 SH	98	}
	99
	100	struct sys_timer netx_timer = {
1a815aed	101	.init = netx_timer_init,
bb6d8c88	102	};