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1da177e4 LT |
1 | /* |
2 | * linux/include/asm-arm/arch-l7200/time.h | |
3 | * | |
4 | * Copyright (C) 2000 Rob Scott (rscott@mtrob.fdns.net) | |
5 | * Steve Hill (sjhill@cotw.com) | |
6 | * | |
7 | * Changelog: | |
8 | * 01-02-2000 RS Created l7200 version, derived from rpc code | |
9 | * 05-03-2000 SJH Complete rewrite | |
10 | */ | |
11 | #ifndef _ASM_ARCH_TIME_H | |
12 | #define _ASM_ARCH_TIME_H | |
13 | ||
14 | #include <asm/arch/irqs.h> | |
15 | ||
16 | /* | |
17 | * RTC base register address | |
18 | */ | |
19 | #define RTC_BASE (IO_BASE_2 + 0x2000) | |
20 | ||
21 | /* | |
22 | * RTC registers | |
23 | */ | |
24 | #define RTC_RTCDR (*(volatile unsigned char *) (RTC_BASE + 0x000)) | |
25 | #define RTC_RTCMR (*(volatile unsigned char *) (RTC_BASE + 0x004)) | |
26 | #define RTC_RTCS (*(volatile unsigned char *) (RTC_BASE + 0x008)) | |
27 | #define RTC_RTCC (*(volatile unsigned char *) (RTC_BASE + 0x008)) | |
28 | #define RTC_RTCDV (*(volatile unsigned char *) (RTC_BASE + 0x00c)) | |
29 | #define RTC_RTCCR (*(volatile unsigned char *) (RTC_BASE + 0x010)) | |
30 | ||
31 | /* | |
32 | * RTCCR register values | |
33 | */ | |
34 | #define RTC_RATE_32 0x00 /* 32 Hz tick */ | |
35 | #define RTC_RATE_64 0x10 /* 64 Hz tick */ | |
36 | #define RTC_RATE_128 0x20 /* 128 Hz tick */ | |
37 | #define RTC_RATE_256 0x30 /* 256 Hz tick */ | |
38 | #define RTC_EN_ALARM 0x01 /* Enable alarm */ | |
39 | #define RTC_EN_TIC 0x04 /* Enable counter */ | |
40 | #define RTC_EN_STWDOG 0x08 /* Enable watchdog */ | |
41 | ||
42 | /* | |
43 | * Handler for RTC timer interrupt | |
44 | */ | |
45 | static irqreturn_t | |
0cd61b68 | 46 | timer_interrupt(int irq, void *dev_id) |
1da177e4 | 47 | { |
0cd61b68 | 48 | struct pt_regs *regs = get_irq_regs(); |
3171a030 | 49 | do_timer(1); |
1da177e4 LT |
50 | #ifndef CONFIG_SMP |
51 | update_process_times(user_mode(regs)); | |
52 | #endif | |
53 | do_profile(regs); | |
54 | RTC_RTCC = 0; /* Clear interrupt */ | |
55 | ||
56 | return IRQ_HANDLED; | |
57 | } | |
58 | ||
59 | /* | |
60 | * Set up RTC timer interrupt, and return the current time in seconds. | |
61 | */ | |
62 | void __init time_init(void) | |
63 | { | |
64 | RTC_RTCC = 0; /* Clear interrupt */ | |
65 | ||
66 | timer_irq.handler = timer_interrupt; | |
67 | ||
68 | setup_irq(IRQ_RTC_TICK, &timer_irq); | |
69 | ||
70 | RTC_RTCCR = RTC_RATE_128 | RTC_EN_TIC; /* Set rate and enable timer */ | |
71 | } | |
72 | ||
73 | #endif |