/*
- * File: arch/blackfin/kernel/time.c
- * Based on: none - original work
- * Author:
+ * arch/blackfin/kernel/time.c
*
- * Created:
- * Description: This file contains the bfin-specific time handling details.
- * Most of the stuff is located in the machine specific files.
+ * This file contains the Blackfin-specific time handling details.
+ * Most of the stuff is located in the machine specific files.
*
- * Modified:
- * Copyright 2004-2006 Analog Devices Inc.
- *
- * Bugs: Enter bugs at http://blackfin.uclinux.org/
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see the file COPYING, or write
- * to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * Copyright 2004-2008 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/irq.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
#include <asm/blackfin.h>
+#include <asm/time.h>
+#include <asm/gptimers.h>
/* This is an NTP setting */
#define TICK_SIZE (tick_nsec / 1000)
-static void time_sched_init(irqreturn_t(*timer_routine)
- (int, void *));
-static unsigned long gettimeoffset(void);
-
static struct irqaction bfin_timer_irq = {
- .name = "BFIN Timer Tick",
+ .name = "Blackfin Timer Tick",
.flags = IRQF_DISABLED
};
-/*
- * The way that the Blackfin core timer works is:
- * - CCLK is divided by a programmable 8-bit pre-scaler (TSCALE)
- * - Every time TSCALE ticks, a 32bit is counted down (TCOUNT)
- *
- * If you take the fastest clock (1ns, or 1GHz to make the math work easier)
- * 10ms is 10,000,000 clock ticks, which fits easy into a 32-bit counter
- * (32 bit counter is 4,294,967,296ns or 4.2 seconds) so, we don't need
- * to use TSCALE, and program it to zero (which is pass CCLK through).
- * If you feel like using it, try to keep HZ * TIMESCALE to some
- * value that divides easy (like power of 2).
- */
-
-#define TIME_SCALE 1
-
-static void
-time_sched_init(irqreturn_t(*timer_routine) (int, void *))
+#if defined(CONFIG_IPIPE)
+void __init setup_system_timer0(void)
+{
+ /* Power down the core timer, just to play safe. */
+ bfin_write_TCNTL(0);
+
+ disable_gptimers(TIMER0bit);
+ set_gptimer_status(0, TIMER_STATUS_TRUN0);
+ while (get_gptimer_status(0) & TIMER_STATUS_TRUN0)
+ udelay(10);
+
+ set_gptimer_config(0, 0x59); /* IRQ enable, periodic, PWM_OUT, SCLKed, OUT PAD disabled */
+ set_gptimer_period(TIMER0_id, get_sclk() / HZ);
+ set_gptimer_pwidth(TIMER0_id, 1);
+ SSYNC();
+ enable_gptimers(TIMER0bit);
+}
+#else
+void __init setup_core_timer(void)
{
u32 tcount;
bfin_write_TCNTL(1);
CSYNC();
- /*
- * the TSCALE prescaler counter.
- */
- bfin_write_TSCALE((TIME_SCALE - 1));
+ /* the TSCALE prescaler counter */
+ bfin_write_TSCALE(TIME_SCALE - 1);
tcount = ((get_cclk() / (HZ * TIME_SCALE)) - 1);
bfin_write_TPERIOD(tcount);
CSYNC();
bfin_write_TCNTL(7);
+}
+#endif
- bfin_timer_irq.handler = (irq_handler_t)timer_routine;
- /* call setup_irq instead of request_irq because request_irq calls
- * kmalloc which has not been initialized yet
- */
+static void __init
+time_sched_init(irqreturn_t(*timer_routine) (int, void *))
+{
+#if defined(CONFIG_IPIPE)
+ setup_system_timer0();
+ bfin_timer_irq.handler = timer_routine;
+ setup_irq(IRQ_TIMER0, &bfin_timer_irq);
+#else
+ setup_core_timer();
+ bfin_timer_irq.handler = timer_routine;
setup_irq(IRQ_CORETMR, &bfin_timer_irq);
+#endif
}
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
/*
* Should return useconds since last timer tick
*/
-static unsigned long gettimeoffset(void)
+u32 arch_gettimeoffset(void)
{
unsigned long offset;
unsigned long clocks_per_jiffy;
+#if defined(CONFIG_IPIPE)
+ clocks_per_jiffy = bfin_read_TIMER0_PERIOD();
+ offset = bfin_read_TIMER0_COUNTER() / \
+ (((clocks_per_jiffy + 1) * HZ) / USEC_PER_SEC);
+
+ if ((get_gptimer_status(0) & TIMER_STATUS_TIMIL0) && offset < (100000 / HZ / 2))
+ offset += (USEC_PER_SEC / HZ);
+#else
clocks_per_jiffy = bfin_read_TPERIOD();
- offset =
- (clocks_per_jiffy -
- bfin_read_TCOUNT()) / (((clocks_per_jiffy + 1) * HZ) /
- USEC_PER_SEC);
+ offset = (clocks_per_jiffy - bfin_read_TCOUNT()) / \
+ (((clocks_per_jiffy + 1) * HZ) / USEC_PER_SEC);
/* Check if we just wrapped the counters and maybe missed a tick */
if ((bfin_read_ILAT() & (1 << IRQ_CORETMR))
- && (offset < (100000 / HZ / 2)))
+ && (offset < (100000 / HZ / 2)))
offset += (USEC_PER_SEC / HZ);
-
+#endif
return offset;
}
+#endif
static inline int set_rtc_mmss(unsigned long nowtime)
{
* as well as call the "do_timer()" routine every clocktick
*/
#ifdef CONFIG_CORE_TIMER_IRQ_L1
-irqreturn_t timer_interrupt(int irq, void *dummy)__attribute__((l1_text));
+__attribute__((l1_text))
#endif
-
irqreturn_t timer_interrupt(int irq, void *dummy)
{
/* last time the cmos clock got updated */
static long last_rtc_update;
write_seqlock(&xtime_lock);
-
do_timer(1);
-#ifndef CONFIG_SMP
- update_process_times(user_mode(get_irq_regs()));
-#endif
- profile_tick(CPU_PROFILING);
-
/*
* If we have an externally synchronized Linux clock, then update
* CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
* called as close as possible to 500 ms before the new second starts.
*/
-
if (ntp_synced() &&
xtime.tv_sec > last_rtc_update + 660 &&
(xtime.tv_nsec / NSEC_PER_USEC) >=
last_rtc_update = xtime.tv_sec - 600;
}
write_sequnlock(&xtime_lock);
+
+#ifdef CONFIG_IPIPE
+ update_root_process_times(get_irq_regs());
+#else
+ update_process_times(user_mode(get_irq_regs()));
+#endif
+ profile_tick(CPU_PROFILING);
+
return IRQ_HANDLED;
}
time_sched_init(timer_interrupt);
}
-#ifndef CONFIG_GENERIC_TIME
-void do_gettimeofday(struct timeval *tv)
-{
- unsigned long flags;
- unsigned long seq;
- unsigned long usec, sec;
-
- do {
- seq = read_seqbegin_irqsave(&xtime_lock, flags);
- usec = gettimeoffset();
- sec = xtime.tv_sec;
- usec += (xtime.tv_nsec / NSEC_PER_USEC);
- }
- while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
-
- while (usec >= USEC_PER_SEC) {
- usec -= USEC_PER_SEC;
- 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_usec
- * 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 -= (gettimeoffset() * NSEC_PER_USEC);
-
- 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 */
-
/*
* Scheduler clock - returns current time in nanosec units.
*/
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff