Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
| 46 | timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
| 47 | { |
| 48 | do_timer(regs); |
| 49 | #ifndef CONFIG_SMP |
| 50 | update_process_times(user_mode(regs)); |
| 51 | #endif |
| 52 | do_profile(regs); |
| 53 | RTC_RTCC = 0; /* Clear interrupt */ |
| 54 | |
| 55 | return IRQ_HANDLED; |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * Set up RTC timer interrupt, and return the current time in seconds. |
| 60 | */ |
| 61 | void __init time_init(void) |
| 62 | { |
| 63 | RTC_RTCC = 0; /* Clear interrupt */ |
| 64 | |
| 65 | timer_irq.handler = timer_interrupt; |
| 66 | |
| 67 | setup_irq(IRQ_RTC_TICK, &timer_irq); |
| 68 | |
| 69 | RTC_RTCCR = RTC_RATE_128 | RTC_EN_TIC; /* Set rate and enable timer */ |
| 70 | } |
| 71 | |
| 72 | #endif |