timer.h

uCOS-II ports on Tensilica HiFi330 core.

/* timer.h -- Timer related definitions
 *
 * This code is taken from example code in the Xtensa Microprocessor
 * Programmer's Guide.
 *
 * WARNING:  It is highly unlikely that this code works as is on your
 *	particular Xtensa processor configuration.  It is hardcoded
 *	for the specific processor configuration used for the
 *	examples in the Xtensa Microprocessor Programmer's Guide.
 *	(The example code did not use the Xtensa HAL to address this
 *	portability issue, for clarity's sake.)  Getting it to work
 *	on another processor configuration requires some modifications.
 */

/*
 * Copyright (c) 2003-2005 by Tensilica Inc.  ALL RIGHTS RESERVED.
 * These coded instructions, statements, and computer programs are the
 * copyrighted works and confidential proprietary information of Tensilica Inc.
 * They may not be modified, copied, reproduced, distributed, or disclosed to
 * third parties in any manner, medium, or form, in whole or in part, without
 * the prior written consent of Tensilica Inc.
 */

#include <xtensa/config/core.h>

#define TIMER0_INTERVAL 0x00008000
#define TIMER1_INTERVAL 0x00008000
#define TIMER2_INTERVAL 0x000186A0
#define TIMER0_INT_MASK (1 << XCHAL_TIMER0_INTERRUPT)
#define TIMER1_INT_MASK (1 << XCHAL_TIMER1_INTERRUPT)
#define TIMER2_INT_MASK (1 << XCHAL_TIMER2_INTERRUPT)

#define _XTSTR(x) # x
#define XTSTR(x) _XTSTR(x)

static __inline__ int read_ccount()
{
    unsigned int ccount;

    __asm__ __volatile__ (
        "rsr     %0, "XTSTR(CCOUNT)
        : "=a" (ccount) 
        );
    return ccount;
}

static __inline__ int read_ccompare0()
{
    unsigned int ccompare0;

    __asm__ __volatile__ (
        "rsr     %0, "XTSTR(CCOMPARE_0)
        : "=a" (ccompare0)
        );
    return ccompare0;
}

static __inline__ int read_ccompare1()
{
    unsigned int ccompare1;

    __asm__ __volatile__ (
        "rsr     %0, "XTSTR(CCOMPARE_1)
        : "=a" (ccompare1)
        );
    return ccompare1;
}

static __inline__ unsigned int read_intenable()
{
    unsigned int intenable;

    __asm__ __volatile__ (
        "rsr     %0, "XTSTR(INTENABLE)
        : "=a" (intenable)
        );
    return intenable;
}

static __inline__ void set_ccompare1(int val)
{
    __asm__ __volatile__ (
        "wsr     %0, "XTSTR(CCOMPARE_1)"\n\t"
        "isync\n\t"
        :
        : "a" (val)
        );
}

static __inline__ void set_ccompare0(int val)
{
    __asm__ __volatile__ (
        "wsr     %0, "XTSTR(CCOMPARE_0)"\n\t"
        "isync\n\t"
        :
        : "a" (val)
        );
}