+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/arch/m32r/kernel/time.c
- *
- * Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
- * Hitoshi Yamamoto
- * Taken from i386 version.
- * Copyright (C) 1991, 1992, 1995 Linus Torvalds
- * Copyright (C) 1996, 1997, 1998 Ralf Baechle
- *
- * This file contains the time handling details for PC-style clocks as
- * found in some MIPS systems.
- *
- * Some code taken from sh version.
- * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
- * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
- */
-
-#undef DEBUG_TIMER
-
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/param.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <linux/profile.h>
-
-#include <asm/io.h>
-#include <asm/m32r.h>
-
-#include <asm/hw_irq.h>
-
-#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
-/* this needs a better home */
-DEFINE_SPINLOCK(rtc_lock);
-
-#ifdef CONFIG_RTC_DRV_CMOS_MODULE
-EXPORT_SYMBOL(rtc_lock);
-#endif
-#endif /* pc-style 'CMOS' RTC support */
-
-#ifdef CONFIG_SMP
-extern void smp_local_timer_interrupt(void);
-#endif
-
-#define TICK_SIZE (tick_nsec / 1000)
-
-/*
- * Change this if you have some constant time drift
- */
-
-/* This is for machines which generate the exact clock. */
-#define USECS_PER_JIFFY (1000000/HZ)
-
-static unsigned long latch;
-
-static u32 m32r_gettimeoffset(void)
-{
- unsigned long elapsed_time = 0; /* [us] */
-
-#if defined(CONFIG_CHIP_M32102) || defined(CONFIG_CHIP_XNUX2) \
- || defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_M32700) \
- || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
-#ifndef CONFIG_SMP
-
- unsigned long count;
-
- /* timer count may underflow right here */
- count = inl(M32R_MFT2CUT_PORTL);
-
- if (inl(M32R_ICU_CR18_PORTL) & 0x00000100) /* underflow check */
- count = 0;
-
- count = (latch - count) * TICK_SIZE;
- elapsed_time = DIV_ROUND_CLOSEST(count, latch);
- /* NOTE: LATCH is equal to the "interval" value (= reload count). */
-
-#else /* CONFIG_SMP */
- unsigned long count;
- static unsigned long p_jiffies = -1;
- static unsigned long p_count = 0;
-
- /* timer count may underflow right here */
- count = inl(M32R_MFT2CUT_PORTL);
-
- if (jiffies == p_jiffies && count > p_count)
- count = 0;
-
- p_jiffies = jiffies;
- p_count = count;
-
- count = (latch - count) * TICK_SIZE;
- elapsed_time = DIV_ROUND_CLOSEST(count, latch);
- /* NOTE: LATCH is equal to the "interval" value (= reload count). */
-#endif /* CONFIG_SMP */
-#elif defined(CONFIG_CHIP_M32310)
-#warning do_gettimeoffse not implemented
-#else
-#error no chip configuration
-#endif
-
- return elapsed_time * 1000;
-}
-
-/*
- * timer_interrupt() needs to keep up the real-time clock,
- * as well as call the "xtime_update()" routine every clocktick
- */
-static irqreturn_t timer_interrupt(int irq, void *dev_id)
-{
-#ifndef CONFIG_SMP
- profile_tick(CPU_PROFILING);
-#endif
- xtime_update(1);
-
-#ifndef CONFIG_SMP
- update_process_times(user_mode(get_irq_regs()));
-#endif
- /* As we return to user mode fire off the other CPU schedulers..
- this is basically because we don't yet share IRQ's around.
- This message is rigged to be safe on the 386 - basically it's
- a hack, so don't look closely for now.. */
-
-#ifdef CONFIG_SMP
- smp_local_timer_interrupt();
- smp_send_timer();
-#endif
-
- return IRQ_HANDLED;
-}
-
-static struct irqaction irq0 = {
- .handler = timer_interrupt,
- .name = "MFT2",
-};
-
-void read_persistent_clock(struct timespec *ts)
-{
- unsigned int epoch, year, mon, day, hour, min, sec;
-
- sec = min = hour = day = mon = year = 0;
- epoch = 0;
-
- year = 23;
- mon = 4;
- day = 17;
-
- /* Attempt to guess the epoch. This is the same heuristic as in rtc.c
- so no stupid things will happen to timekeeping. Who knows, maybe
- Ultrix also uses 1952 as epoch ... */
- if (year > 10 && year < 44)
- epoch = 1980;
- else if (year < 96)
- epoch = 1952;
- year += epoch;
-
- ts->tv_sec = mktime(year, mon, day, hour, min, sec);
- ts->tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
-}
-
-
-void __init time_init(void)
-{
- arch_gettimeoffset = m32r_gettimeoffset;
-
-#if defined(CONFIG_CHIP_M32102) || defined(CONFIG_CHIP_XNUX2) \
- || defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_M32700) \
- || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
-
- /* M32102 MFT setup */
- setup_irq(M32R_IRQ_MFT2, &irq0);
- {
- unsigned long bus_clock;
- unsigned short divide;
-
- bus_clock = boot_cpu_data.bus_clock;
- divide = boot_cpu_data.timer_divide;
- latch = DIV_ROUND_CLOSEST(bus_clock/divide, HZ);
-
- printk("Timer start : latch = %ld\n", latch);
-
- outl((M32R_MFTMOD_CC_MASK | M32R_MFTMOD_TCCR \
- |M32R_MFTMOD_CSSEL011), M32R_MFT2MOD_PORTL);
- outl(latch, M32R_MFT2RLD_PORTL);
- outl(latch, M32R_MFT2CUT_PORTL);
- outl(0, M32R_MFT2CMPRLD_PORTL);
- outl((M32R_MFTCR_MFT2MSK|M32R_MFTCR_MFT2EN), M32R_MFTCR_PORTL);
- }
-
-#elif defined(CONFIG_CHIP_M32310)
-#warning time_init not implemented
-#else
-#error no chip configuration
-#endif
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff