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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 <asm/hardware.h> | |
21 | #include <asm/irq.h> | |
22 | #include <asm/arch/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 | |
0cd61b68 | 30 | h7201_timer_interrupt(int irq, void *dev_id) |
1da177e4 LT |
31 | { |
32 | write_seqlock(&xtime_lock); | |
33 | ||
34 | CPU_REG (TIMER_VIRT, TIMER_TOPSTAT); | |
0cd61b68 | 35 | timer_tick(); |
1da177e4 LT |
36 | |
37 | write_sequnlock(&xtime_lock); | |
38 | ||
39 | return IRQ_HANDLED; | |
40 | } | |
41 | ||
42 | static struct irqaction h7201_timer_irq = { | |
43 | .name = "h7201 Timer Tick", | |
52e405ea | 44 | .flags = IRQF_DISABLED | IRQF_TIMER, |
09b8b5f8 | 45 | .handler = h7201_timer_interrupt, |
1da177e4 LT |
46 | }; |
47 | ||
48 | /* | |
49 | * Setup TIMER0 as system timer | |
50 | */ | |
51 | void __init h7201_init_time(void) | |
52 | { | |
53 | CPU_REG (TIMER_VIRT, TM0_PERIOD) = LATCH; | |
54 | CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_RESET; | |
55 | CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_REPEAT | TM_START; | |
56 | CPU_REG (TIMER_VIRT, TIMER_TOPCTRL) = ENABLE_TM0_INTR | TIMER_ENABLE_BIT; | |
57 | ||
58 | setup_irq(IRQ_TIMER0, &h7201_timer_irq); | |
59 | } | |
60 | ||
61 | struct sys_timer h7201_timer = { | |
62 | .init = h7201_init_time, | |
63 | .offset = h720x_gettimeoffset, | |
64 | }; |