base/include/asm-arm/arch-at91/rtai_timer.h

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/* 020222 asm-arm/arch-at91/timer.h - ARM/AT91 specific timer
Don't include directly - it's included through asm-arm/rtai.h

Copyright (c) 2005 Luca Pizzi, (lucapizzi@hotmail.com)
Copyright (c) 2005 Stefano Gafforelli, (stefano.gafforelli@tiscali.it)
COPYRIGHT (C) 2002 Guennadi Liakhovetski, DSA GmbH (gl@dsa-ac.de)
COPYRIGHT (C) 2002 Wolfgang Müller (wolfgang.mueller@dsa-ac.de)
Copyright (c) 2001 Alex Züpke, SYSGO RTS GmbH (azu@sysgo.de)
Copyright (C) 2007 Adeneo

This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License as
published by the Free Software Foundation.

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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
/*
--------------------------------------------------------------------------
Acknowledgements
- Paolo Mantegazza  (mantegazza@aero.polimi.it)
    creator of RTAI 
*/

#ifndef _ASM_ARCH_RTAI_TIMER_H_
#define _ASM_ARCH_RTAI_TIMER_H_

#include <linux/time.h>
#include <linux/timer.h>
#include <asm/mach/irq.h>
#include <linux/timex.h>

#include <asm/arch/rtai_arch.h>
#include <asm/arch/at91_tc.h>

/* specific at91 tc registers read/write functions */

static inline unsigned int at91_tc_read(unsigned int reg_offset)
{
    unsigned long addr =
        (AT91_VA_BASE_TCB0 + 0x40 * CONFIG_IPIPE_AT91_TC);

    return readl((void __iomem *)(addr + reg_offset));
}

static inline void at91_tc_write(unsigned int reg_offset, unsigned long value)
{
    unsigned long addr =
        (AT91_VA_BASE_TCB0 + 0x40 * CONFIG_IPIPE_AT91_TC);

    writel(value, (void __iomem *)(addr + reg_offset));
}

extern notrace unsigned long long __ipipe_get_tsc(void);
extern notrace void __ipipe_set_tsc(unsigned long long value);

static inline void rtai_at91_update_tsc(void)
{
    __ipipe_set_tsc(__ipipe_get_tsc()+rt_times.periodic_tick);
};

extern unsigned int rt_periodic;

static inline RTIME rtai_rdtsc(void)
{
    if(!rt_periodic)
        /*
         * one-shot mode : use ipipe native get tsc
         */
        return __ipipe_mach_get_tsc();
    else
        /*
         * periodic mode : use specific get tsc
         * tsc has been updated since last shot by rtai_at91_update_tsc
         */
        return __ipipe_get_tsc()+at91_tc_read(AT91_TC_CV);
}

static inline void rt_set_timer_delay(unsigned long delay)
{
    if (delay) {
        /*
         * one-shot mode : reprogramm timer
         */
        __ipipe_mach_set_dec(delay);
    } else {
        /*
         * periodic mode: at91's TC reload itself 
         * so nothing to do
         */
    }
}
#endif /* !_ASM_ARCH_RTAI_TIMER_H_ */

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