115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
/***************************************************************************/
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/*
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* linux/arch/m68knommu/platform/68328/timers.c
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*
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* Copyright (C) 1993 Hamish Macdonald
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* Copyright (C) 1999 D. Jeff Dionne
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* Copyright (C) 2001 Georges Menie, Ken Desmet
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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/***************************************************************************/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <asm/setup.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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#include <asm/machdep.h>
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#include <asm/MC68VZ328.h>
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/***************************************************************************/
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#if defined(CONFIG_DRAGEN2)
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/* with a 33.16 MHz clock, this will give usec resolution to the time functions */
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#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
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#define CLOCK_PRE 7
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#define TICKS_PER_JIFFY 41450
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#elif defined(CONFIG_XCOPILOT_BUGS)
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/*
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* The only thing I know is that CLK32 is not available on Xcopilot
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* I have little idea about what frequency SYSCLK has on Xcopilot.
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* The values for prescaler and compare registers were simply
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* taken from the original source
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*/
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#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
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#define CLOCK_PRE 2
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#define TICKS_PER_JIFFY 0xd7e4
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#else
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/* default to using the 32Khz clock */
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#define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ
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#define CLOCK_PRE 31
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#define TICKS_PER_JIFFY 10
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#endif
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/***************************************************************************/
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static irqreturn_t hw_tick(int irq, void *dummy)
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{
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/* Reset Timer1 */
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TSTAT &= 0;
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return arch_timer_interrupt(irq, dummy);
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}
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/***************************************************************************/
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static struct irqaction m68328_timer_irq = {
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.name = "timer",
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.flags = IRQF_DISABLED | IRQF_TIMER,
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.handler = hw_tick,
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};
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void hw_timer_init(void)
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{
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/* disable timer 1 */
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TCTL = 0;
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/* set ISR */
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setup_irq(TMR_IRQ_NUM, &m68328_timer_irq);
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/* Restart mode, Enable int, Set clock source */
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TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
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TPRER = CLOCK_PRE;
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TCMP = TICKS_PER_JIFFY;
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/* Enable timer 1 */
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TCTL |= TCTL_TEN;
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}
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/***************************************************************************/
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unsigned long hw_timer_offset(void)
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{
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unsigned long ticks = TCN, offset = 0;
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/* check for pending interrupt */
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if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM)))
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offset = 1000000 / HZ;
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ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY;
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return ticks + offset;
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}
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/***************************************************************************/
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void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec)
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{
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long now = RTCTIME;
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*year = *mon = *day = 1;
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*hour = (now >> 24) % 24;
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*min = (now >> 16) % 60;
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*sec = now % 60;
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}
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/***************************************************************************/
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