1/***************************************************************************/ 2 3/* 4 * linux/arch/m68knommu/platform/68328/timers.c 5 * 6 * Copyright (C) 1993 Hamish Macdonald 7 * Copyright (C) 1999 D. Jeff Dionne 8 * Copyright (C) 2001 Georges Menie, Ken Desmet 9 * 10 * This file is subject to the terms and conditions of the GNU General Public 11 * License. See the file COPYING in the main directory of this archive 12 * for more details. 13 */ 14 15/***************************************************************************/ 16 17#include <linux/types.h> 18#include <linux/kernel.h> 19#include <linux/mm.h> 20#include <linux/interrupt.h> 21#include <asm/setup.h> 22#include <asm/system.h> 23#include <asm/pgtable.h> 24#include <asm/irq.h> 25#include <asm/machdep.h> 26#include <asm/MC68VZ328.h> 27 28/***************************************************************************/ 29 30#if defined(CONFIG_DRAGEN2) 31/* with a 33.16 MHz clock, this will give usec resolution to the time functions */ 32#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK 33#define CLOCK_PRE 7 34#define TICKS_PER_JIFFY 41450 35 36#elif defined(CONFIG_XCOPILOT_BUGS) 37/* 38 * The only thing I know is that CLK32 is not available on Xcopilot 39 * I have little idea about what frequency SYSCLK has on Xcopilot. 40 * The values for prescaler and compare registers were simply 41 * taken from the original source 42 */ 43#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK 44#define CLOCK_PRE 2 45#define TICKS_PER_JIFFY 0xd7e4 46 47#else 48/* default to using the 32Khz clock */ 49#define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ 50#define CLOCK_PRE 31 51#define TICKS_PER_JIFFY 10 52#endif 53 54/***************************************************************************/ 55 56void m68328_timer_init(irq_handler_t timer_routine) 57{ 58 /* disable timer 1 */ 59 TCTL = 0; 60 61 /* set ISR */ 62 if (request_irq(TMR_IRQ_NUM, timer_routine, IRQ_FLG_LOCK, "timer", NULL)) 63 panic("Unable to attach timer interrupt\n"); 64 65 /* Restart mode, Enable int, Set clock source */ 66 TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE; 67 TPRER = CLOCK_PRE; 68 TCMP = TICKS_PER_JIFFY; 69 70 /* Enable timer 1 */ 71 TCTL |= TCTL_TEN; 72} 73 74/***************************************************************************/ 75 76void m68328_timer_tick(void) 77{ 78 /* Reset Timer1 */ 79 TSTAT &= 0; 80} 81/***************************************************************************/ 82 83unsigned long m68328_timer_gettimeoffset(void) 84{ 85 unsigned long ticks = TCN, offset = 0; 86 87 /* check for pending interrupt */ 88 if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM))) 89 offset = 1000000 / HZ; 90 ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY; 91 return ticks + offset; 92} 93 94/***************************************************************************/ 95 96void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec) 97{ 98 long now = RTCTIME; 99 100 *year = *mon = *day = 1; 101 *hour = (now >> 24) % 24; 102 *min = (now >> 16) % 60; 103 *sec = now % 60; 104} 105 106/***************************************************************************/ 107