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Sascha Hauerbb6d8c82006-06-19 15:27:53 +01001/*
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>
Sascha Hauer1a815ae2006-12-12 09:23:45 +010022#include <linux/irq.h>
23#include <linux/clocksource.h>
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010024
25#include <asm/hardware.h>
26#include <asm/io.h>
27#include <asm/mach/time.h>
28#include <asm/arch/netx-regs.h>
29
30/*
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010031 * IRQ handler for the timer
32 */
33static irqreturn_t
Linus Torvalds0cd61b62006-10-06 10:53:39 -070034netx_timer_interrupt(int irq, void *dev_id)
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010035{
Linus Torvalds0cd61b62006-10-06 10:53:39 -070036 timer_tick();
Sascha Hauer1a815ae2006-12-12 09:23:45 +010037
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010038 /* acknowledge interrupt */
39 writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
40
41 return IRQ_HANDLED;
42}
43
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010044static struct irqaction netx_timer_irq = {
45 .name = "NetX Timer Tick",
Bernhard Walleb30faba2007-05-08 00:35:39 -070046 .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010047 .handler = netx_timer_interrupt,
48};
49
Sascha Hauer1a815ae2006-12-12 09:23:45 +010050cycle_t netx_get_cycles(void)
51{
52 return readl(NETX_GPIO_COUNTER_CURRENT(1));
53}
54
55static struct clocksource clocksource_netx = {
56 .name = "netx_timer",
57 .rating = 200,
58 .read = netx_get_cycles,
59 .mask = CLOCKSOURCE_MASK(32),
60 .shift = 20,
Thomas Gleixnerc66699a2007-02-16 01:27:37 -080061 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
Sascha Hauer1a815ae2006-12-12 09:23:45 +010062};
63
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010064/*
65 * Set up timer interrupt
66 */
67static 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);
Sascha Hauer1a815ae2006-12-12 09:23:45 +010086
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);
Sascha Hauerbb6d8c82006-06-19 15:27:53 +010098}
99
100struct sys_timer netx_timer = {
Sascha Hauer1a815ae2006-12-12 09:23:45 +0100101 .init = netx_timer_init,
Sascha Hauerbb6d8c82006-06-19 15:27:53 +0100102};