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[MIPS] DS1287: Add clockevent driver

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Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Yoichi Yuasa
2008-04-25 12:11:44 +09:00
committed by Ralf Baechle
parent 4247417d84
commit 6457d9fc3b
5 changed files with 185 additions and 49 deletions
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73
arch/mips/dec/time.c
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@ -9,30 +9,15 @@
*
*/
#include <linux/bcd.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mc146818rtc.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/param.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/time.h>
#include <linux/types.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/sections.h>
#include <asm/cpu-features.h>
#include <asm/ds1287.h>
#include <asm/time.h>
#include <asm/dec/interrupts.h>
#include <asm/dec/ioasic.h>
#include <asm/dec/ioasic_addrs.h>
#include <asm/dec/machtype.h>
unsigned long read_persistent_clock(void)
@ -139,42 +124,32 @@ int rtc_mips_set_mmss(unsigned long nowtime)
return retval;
}
static int dec_timer_state(void)
{
return (CMOS_READ(RTC_REG_C) & RTC_PF) != 0;
}
static void dec_timer_ack(void)
{
CMOS_READ(RTC_REG_C); /* Ack the RTC interrupt. */
}
static cycle_t dec_ioasic_hpt_read(void)
{
/*
* The free-running counter is 32-bit which is good for about
* 2 minutes, 50 seconds at possible count rates of up to 25MHz.
*/
return ioasic_read(IO_REG_FCTR);
}
void __init plat_time_init(void)
{
mips_timer_ack = dec_timer_ack;
u32 start, end;
int i = HZ / 10;
if (!cpu_has_counter && IOASIC)
/* Set up the rate of periodic DS1287 interrupts. */
ds1287_set_base_clock(HZ);
if (cpu_has_counter) {
while (!ds1287_timer_state())
;
start = read_c0_count();
while (i--)
while (!ds1287_timer_state())
;
end = read_c0_count();
mips_hpt_frequency = (end - start) * 10;
printk(KERN_INFO "MIPS counter frequency %dHz\n",
mips_hpt_frequency);
} else if (IOASIC)
/* For pre-R4k systems we use the I/O ASIC's counter. */
dec_ioasic_clocksource_init();
/* Set up the rate of periodic DS1287 interrupts. */
CMOS_WRITE(RTC_REF_CLCK_32KHZ | (16 - __ffs(HZ)), RTC_REG_A);
}
void __init plat_timer_setup(struct irqaction *irq)
{
setup_irq(dec_interrupt[DEC_IRQ_RTC], irq);
/* Enable periodic DS1287 interrupts. */
CMOS_WRITE(CMOS_READ(RTC_REG_B) | RTC_PIE, RTC_REG_B);
ds1287_clockevent_init(dec_interrupt[DEC_IRQ_RTC]);
}