1 /*
2 * linux/arch/arm/mach-h720x/cpu-h7201.c
3 *
4 * Copyright (C) 2003 Thomas Gleixner <tglx@linutronix.de>
5 * 2003 Robert Schwebel <r.schwebel@pengutronix.de>
6 * 2004 Sascha Hauer <s.hauer@pengutronix.de>
7 *
8 * processor specific stuff for the Hynix h7201
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 */
15
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/module.h>
19 #include <asm/types.h>
20 #include <mach/hardware.h>
21 #include <asm/irq.h>
22 #include <mach/irqs.h>
23 #include <asm/mach/irq.h>
24 #include <asm/mach/time.h>
25 #include "common.h"
26 /*
27 * Timer interrupt handler
28 */
29 static irqreturn_t
h7201_timer_interrupt(int irq,void * dev_id)30 h7201_timer_interrupt(int irq, void *dev_id)
31 {
32 CPU_REG (TIMER_VIRT, TIMER_TOPSTAT);
33 timer_tick();
34
35 return IRQ_HANDLED;
36 }
37
38 static struct irqaction h7201_timer_irq = {
39 .name = "h7201 Timer Tick",
40 .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
41 .handler = h7201_timer_interrupt,
42 };
43
44 /*
45 * Setup TIMER0 as system timer
46 */
h7201_init_time(void)47 void __init h7201_init_time(void)
48 {
49 CPU_REG (TIMER_VIRT, TM0_PERIOD) = LATCH;
50 CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_RESET;
51 CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_REPEAT | TM_START;
52 CPU_REG (TIMER_VIRT, TIMER_TOPCTRL) = ENABLE_TM0_INTR | TIMER_ENABLE_BIT;
53
54 setup_irq(IRQ_TIMER0, &h7201_timer_irq);
55 }
56
57 struct sys_timer h7201_timer = {
58 .init = h7201_init_time,
59 .offset = h720x_gettimeoffset,
60 };
61