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-rw-r--r--arch/arm/mach-netx/time.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/arm/mach-netx/time.c b/arch/arm/mach-netx/time.c
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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>
22
23#include <asm/hardware.h>
24#include <asm/io.h>
25#include <asm/mach/time.h>
26#include <asm/arch/netx-regs.h>
27
28/*
29 * Returns number of us since last clock interrupt. Note that interrupts
30 * will have been disabled by do_gettimeoffset()
31 */
32static unsigned long netx_gettimeoffset(void)
33{
34 return readl(NETX_GPIO_COUNTER_CURRENT(0)) / 100;
35}
36
37/*
38 * IRQ handler for the timer
39 */
40static irqreturn_t
41netx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
42{
43 write_seqlock(&xtime_lock);
44
45 timer_tick(regs);
46 write_sequnlock(&xtime_lock);
47
48 /* acknowledge interrupt */
49 writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
50
51 return IRQ_HANDLED;
52}
53
54
55static struct irqaction netx_timer_irq = {
56 .name = "NetX Timer Tick",
57 .flags = SA_INTERRUPT | SA_TIMER,
58 .handler = netx_timer_interrupt,
59};
60
61/*
62 * Set up timer interrupt
63 */
64static void __init netx_timer_init(void)
65{
66 /* disable timer initially */
67 writel(0, NETX_GPIO_COUNTER_CTRL(0));
68
69 /* Reset the timer value to zero */
70 writel(0, NETX_GPIO_COUNTER_CURRENT(0));
71
72 writel(LATCH, NETX_GPIO_COUNTER_MAX(0));
73
74 /* acknowledge interrupt */
75 writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
76
77 /* Enable the interrupt in the specific timer register and start timer */
78 writel(COUNTER_BIT(0), NETX_GPIO_IRQ_ENABLE);
79 writel(NETX_GPIO_COUNTER_CTRL_IRQ_EN | NETX_GPIO_COUNTER_CTRL_RUN,
80 NETX_GPIO_COUNTER_CTRL(0));
81
82 setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq);
83}
84
85struct sys_timer netx_timer = {
86 .init = netx_timer_init,
87 .offset = netx_gettimeoffset,
88};