--- /dev/null
+/*
+ * linux/arch/m68k/coldfire/time.c
+ *
+ * This file contains the coldfire specific time handling pieces.
+ *
+ * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Kurt Mahan <kmahan@freescale.com>
+ * Jason Jin Jason.Jin@freescale.com
+ * Shrek Wu B16972@freescale.com
+ *
+ * based on linux/arch/m68k/kernel/time.c
+ */
+#include <linux/clk.h>
+#include <linux/clk.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/sysdev.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/rtc.h>
+
+#include <asm/machdep.h>
+#include <linux/io.h>
+#include <asm/irq_regs.h>
+
+#include <linux/profile.h>
+#include <asm/mcfsim.h>
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
+/*extern unsigned long long sys_dtim0_read(void);
+extern void sys_dtim_init(void);*/
+extern unsigned long long sys_dtim2_read(void);
+extern void sys_dtim2_init(void);
+static int cfv4_set_next_event(unsigned long evt,
+ struct clock_event_device *dev);
+static void cfv4_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *dev);
+#if defined(CONFIG_M5445X)
+#define FREQ (MCF_BUSCLK / 16)
+#else
+#define FREQ (MCF_BUSCLK)
+#endif
+/*
+ * realtime clock dummy code
+ */
+
+static unsigned long null_rtc_get_time(void)
+{
+ return mktime(2008, 1, 1, 0, 0, 0);
+}
+
+static int null_rtc_set_time(unsigned long sec)
+{
+ return 0;
+}
+
+static unsigned long (*cf_rtc_get_time)(void) = null_rtc_get_time;
+static int (*cf_rtc_set_time)(unsigned long) = null_rtc_set_time;
+#endif /* CONFIG_GENERIC_CLOCKEVENTS */
+
+/*
+ * old pre-GENERIC clock code
+ */
+
+#ifndef CONFIG_GENERIC_CLOCKEVENTS
+/*
+ * timer_interrupt() needs to keep up the real-time clock,
+ * as well as call the "do_timer()" routine every clocktick
+ */
+static irqreturn_t timer_interrupt(int irq, void *dummy)
+{
+#ifdef CONFIG_COLDFIRE
+ /* kick hardware timer if necessary */
+ if (mach_tick)
+ mach_tick();
+#endif
+ do_timer(1);
+#ifndef CONFIG_SMP
+ update_process_times(user_mode(get_irq_regs()));
+#endif
+ profile_tick(CPU_PROFILING);
+
+#ifdef CONFIG_HEARTBEAT
+ /* use power LED as a heartbeat instead -- much more useful
+ for debugging -- based on the version for PReP by Cort */
+ /* acts like an actual heart beat -- ie thump-thump-pause... */
+ if (mach_heartbeat) {
+ unsigned cnt = 0, period = 0, dist = 0;
+
+ if (cnt == 0 || cnt == dist)
+ mach_heartbeat(1);
+ else if (cnt == 7 || cnt == dist+7)
+ mach_heartbeat(0);
+
+ if (++cnt > period) {
+ cnt = 0;
+ /* The hyperbolic function below modifies
+ * the heartbeat period length in dependency
+ * of the current (5min) load. It goes through
+ * the points f(0)=126, f(1)=86, f(5)=51,
+ * f(inf)->30. */
+ period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT)))
+ + 30;
+ dist = period / 4;
+ }
+ }
+#endif /* CONFIG_HEARTBEAT */
+ return IRQ_HANDLED;
+}
+
+void __init time_init(void)
+{
+ struct rtc_time time;
+
+ if (mach_hwclk) {
+ mach_hwclk(0, &time);
+ time.tm_year += 1900;
+ if (time.tm_year < 1970)
+ time.tm_year += 100;
+ xtime.tv_sec = mktime(time.tm_year, time.tm_mon, time.tm_mday,
+ time.tm_hour, time.tm_min, time.tm_sec);
+ xtime.tv_nsec = 0;
+ }
+ wall_to_monotonic.tv_sec = -xtime.tv_sec;
+
+ mach_sched_init(timer_interrupt);
+}
+#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
+
+#ifndef CONFIG_GENERIC_TIME
+/*
+ * This version of gettimeofday has near microsecond resolution.
+ */
+void do_gettimeofday(struct timeval *tv)
+{
+ unsigned long flags;
+ unsigned long seq;
+ unsigned long usec, sec;
+ unsigned long max_ntp_tick = tick_usec - tickadj;
+
+ do {
+ seq = read_seqbegin_irqsave(&xtime_lock, flags);
+
+ usec = mach_gettimeoffset();
+
+ /*
+ * If time_adjust is negative then NTP is slowing the clock
+ * so make sure not to go into next possible interval.
+ * Better to lose some accuracy than have time go backwards..
+ */
+ if (unlikely(time_adjust < 0))
+ usec = min(usec, max_ntp_tick);
+
+ sec = xtime.tv_sec;
+ usec += xtime.tv_nsec/1000;
+ } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
+
+
+ while (usec >= 1000000) {
+ usec -= 1000000;
+ sec++;
+ }
+
+ tv->tv_sec = sec;
+ tv->tv_usec = usec;
+}
+EXPORT_SYMBOL(do_gettimeofday);
+
+int do_settimeofday(struct timespec *tv)
+{
+ time_t wtm_sec, sec = tv->tv_sec;
+ long wtm_nsec, nsec = tv->tv_nsec;
+
+ if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
+ return -EINVAL;
+
+ write_seqlock_irq(&xtime_lock);
+ /* This is revolting. We need to set the xtime.tv_nsec
+ * correctly. However, the value in this location is
+ * is value at the last tick.
+ * Discover what correction gettimeofday
+ * would have done, and then undo it!
+ */
+ nsec -= 1000 * mach_gettimeoffset();
+
+ wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
+ wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
+
+ set_normalized_timespec(&xtime, sec, nsec);
+ set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
+
+ ntp_clear();
+ write_sequnlock_irq(&xtime_lock);
+ clock_was_set();
+ return 0;
+}
+EXPORT_SYMBOL(do_settimeofday);
+#endif /* !CONFIG_GENERIC_TIME */
+
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
+/*
+ * Clock Evnt setup
+ */
+static struct clock_event_device clockevent_cfv4 = {
+ .name = "CFV4 timer2even",
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ .rating = 200,
+ .shift = 20,
+ .set_mode = cfv4_set_mode,
+ .set_next_event = cfv4_set_next_event,
+};
+
+static int cfv4_set_next_event(unsigned long evt,
+ struct clock_event_device *dev)
+{
+ return 0;
+}
+
+static void cfv4_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *dev)
+{
+ if (mode != CLOCK_EVT_MODE_ONESHOT)
+ cfv4_set_next_event((FREQ / HZ), dev);
+}
+
+static int __init cfv4_clockevent_init(void)
+{
+ clockevent_cfv4.mult =
+ div_sc(FREQ, NSEC_PER_SEC,
+ clockevent_cfv4.shift);
+ clockevent_cfv4.max_delta_ns =
+ clockevent_delta2ns((FREQ / HZ),
+ &clockevent_cfv4);
+ clockevent_cfv4.min_delta_ns =
+ clockevent_delta2ns(1, &clockevent_cfv4);
+
+ clockevent_cfv4.cpumask = &cpumask_of_cpu(0);
+
+ printk(KERN_INFO "timer: register clockevent\n");
+ clockevents_register_device(&clockevent_cfv4);
+
+ return 0;
+}
+
+/*
+ * clocksource setup
+ */
+
+struct clocksource clocksource_cfv4 = {
+ .name = "ColdfireV4",
+ .rating = 250,
+ .mask = CLOCKSOURCE_MASK(32),
+ .read = sys_dtim2_read,
+ .shift = 20,
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+/*
+ * Initialize time subsystem. Called from linux/init/main.c
+ */
+void __init time_init(void)
+{
+ int ret;
+
+ printk(KERN_INFO "Initializing time\n");
+#if 0
+ /* initialize system clocks */
+ clk_init();
+#endif
+ cfv4_clockevent_init();
+ /* initialize the system timer */
+ /*sys_dtim_init();*/
+ sys_dtim2_init();
+ /* setup initial system time */
+ xtime.tv_sec = cf_rtc_get_time();
+ xtime.tv_nsec = 0;
+ set_normalized_timespec(&wall_to_monotonic, -xtime.tv_sec,
+ -xtime.tv_nsec);
+
+ /* JKM */
+ clocksource_cfv4.mult = clocksource_hz2mult(FREQ,
+ clocksource_cfv4.shift);
+
+ /* register our clocksource */
+ ret = clocksource_register(&clocksource_cfv4);
+ if (ret)
+ printk(KERN_ERR "timer: unable to "
+ "register clocksource - %d\n", ret);
+}
+
+/*
+ * sysfs pieces
+ */
+
+static struct sysdev_class timer_class = {
+ .name = "timer",
+};
+
+static struct sys_device timer_device = {
+ .id = 0,
+ .cls = &timer_class,
+};
+
+static int __init timer_init_sysfs(void)
+{
+ int err = sysdev_class_register(&timer_class);
+ if (!err)
+ err = sysdev_register(&timer_device);
+ return err;
+}
+device_initcall(timer_init_sysfs);
+#endif /* CONFIG_GENERIC_CLOCKEVENTS */
projects / openwrt / svn-archive / archive.git / blobdiff