Gilles Chanteperdrix wrote:
Danilo Levantesi wrote:
So what is the status of the port? Is anything working on a pxa arch?
More recently, Detlef Vollmann seem also to have begun a port to
PXA.
Unfortunately my priorities were shifted, so I'm not able to
work on it for the next few weeks.
What I've done so far is attached.
IT'S UNTESTED!!!
So it's nothing you can just use, but something that you can build
on (possibly).
I'd be happy to hear about any experience with this.
What is missing is a look at entry-macro.S.
Stelian Pop has done something for the Integrator that I don't
really understand and therefore I can't say whether the PXA needs
something similar.
Detlef
--
Detlef Vollmann vollmann engineering gmbh
Linux and C++ for Embedded Systemshttp://www.vollmann.ch/
Linux for PXA270 Colibri module: http://www.vollmann.ch/en/colibri/
/*
* arch/arm/mach-pxa/time.c
*
* Author: Nicolas Pitre
* Created: Jun 15, 2001
* Copyright: MontaVista Software Inc.
*
* Preliminary support for I-PIPE !!! COMPLETELY UNTESTED !!!
* Copyright (c) 2006 Detlef Vollmann [EMAIL PROTECTED]
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include linux/config.h
#include linux/kernel.h
#include linux/module.h
#include linux/init.h
#include linux/delay.h
#include linux/interrupt.h
#include linux/time.h
#include linux/signal.h
#include linux/errno.h
#include linux/sched.h
#include asm/system.h
#include asm/hardware.h
#include asm/io.h
#include asm/leds.h
#include asm/irq.h
#include asm/mach/irq.h
#include asm/mach/time.h
#include asm/arch/pxa-regs.h
#ifdef CONFIG_IPIPE
#ifdef CONFIG_NO_IDLE_HZ
#error dynamic tick timer not yet supported with IPIPE
#endif
int __ipipe_mach_timerint = IRQ_OST0;
static DEFINE_SPINLOCK(timer_lock);
int __ipipe_mach_timerstolen = 0;
EXPORT_SYMBOL(__ipipe_mach_timerstolen);
unsigned int __ipipe_mach_ticks_per_jiffy = CLOCK_TICK_RATE / HZ;
EXPORT_SYMBOL(__ipipe_mach_ticks_per_jiffy);
#endif
static unsigned long timer_reload = LATCH;
static int timer_initialized = 0;
static inline unsigned long pxa_get_rtc_time(void)
{
return RCNR;
}
static int pxa_set_rtc(void)
{
unsigned long current_time = xtime.tv_sec;
if (RTSR RTSR_ALE) {
/* make sure not to forward the clock over an alarm */
unsigned long alarm = RTAR;
if (current_time = alarm alarm = RCNR)
return -ERESTARTSYS;
}
RCNR = current_time;
return 0;
}
/* IRQs are disabled before entering here from do_gettimeofday() */
static unsigned long pxa_gettimeoffset (void)
{
long ticks_to_match, elapsed, usec;
if (!timer_initialized)
return 0;
/* Get ticks before next timer match */
ticks_to_match = OSMR0 - OSCR;
/* We need elapsed ticks since last match */
elapsed = LATCH - ticks_to_match;
/* don't get fooled by the workaround in pxa_timer_interrupt() */
if (elapsed = 0)
return 0;
/* Now convert them to usec */
usec = (unsigned long)(elapsed * (tick_nsec / 1000))/LATCH;
return usec;
}
#ifdef CONFIG_NO_IDLE_HZ
static unsigned long initial_match;
static int match_posponed;
#endif
static irqreturn_t
pxa_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
int next_match;
write_seqlock(xtime_lock);
#ifdef CONFIG_NO_IDLE_HZ
if (match_posponed) {
match_posponed = 0;
OSMR0 = initial_match;
}
#endif
/* Loop until we get ahead of the free running timer.
* This ensures an exact clock tick count and time accuracy.
* Since IRQs are disabled at this point, coherence between
* lost_ticks(updated in do_timer()) and the match reg value is
* ensured, hence we can use do_gettimeofday() from interrupt
* handlers.
*
* HACK ALERT: it seems that the PXA timer regs aren't updated right
* away in all cases when a write occurs. We therefore compare with
* 8 instead of 0 in the while() condition below to avoid missing a
* match if OSCR has already reached the next OSMR value.
* Experience has shown that up to 6 ticks are needed to work around
* this problem, but let's use 8 to be conservative. Note that this
* affect things only when the timer IRQ has been delayed by nearly
* exactly one tick period which should be a pretty rare event.
*/
#ifdef CONFIG_IPIPE
/*
* - if Linux is running natively (no ipipe), ack and reprogram the timer
* - if Linux is running under ipipe, but it still has the control over
* the timer (no Xenomai for example), then reprogram the timer (ipipe
* has already acked it)
* - if some other
