source: rtems/c/src/lib/libcpu/powerpc/mpc83xx/gtm/gtm.c @ d3c32136

/**
 * @file
 *
 * @brief Source file for timer functions.
 */

/*
 * Copyright (c) 2008
 * Embedded Brains GmbH
 * Obere Lagerstr. 30
 * D-82178 Puchheim
 * Germany
 * rtems@embedded-brains.de
 *
 * The license and distribution terms for this file may be found in the file
 * LICENSE in this distribution or at http://www.rtems.com/license/LICENSE.
 */

#include <rtems/bspIo.h>

#include <mpc83xx/mpc83xx.h>
#include <mpc83xx/gtm.h>

#define RTEMS_STATUS_CHECKS_USE_PRINTK

#include <rtems/status-checks.h>

#define MPC83XX_GTM_CHECK_INDEX( timer) \
        if (( timer) < 0 || ( timer) >= MPC83XX_GTM_NUMBER) { \
                return RTEMS_INVALID_NUMBER; \
        }

#define MPC83XX_GTM_VARIABLES( timer) \
        int module = (timer) / 4; \
        int module_timer = (timer) % 4; \
        int high = module_timer / 2; \
        int low = module_timer % 2; \
        rtems_interrupt_level level;

#define MPC83XX_GTM_CLOCK_MASK MPC83XX_GTM_CLOCK_EXTERN

static const uint8_t mpc83xx_gmt_interrupt_vector_table [MPC83XX_GTM_NUMBER] = { 90, 78, 84, 72, 91, 79, 85, 73 };

static const uint8_t mpc83xx_gmt_interrupt_priority_table [MPC83XX_GTM_NUMBER] = { 113, 77, 95, 59, 116, 80, 98, 62 };

rtems_status_code mpc83xx_gtm_initialize( int timer, int clock)
{
        rtems_status_code sc = RTEMS_SUCCESSFUL;

        MPC83XX_GTM_VARIABLES( timer);

        uint8_t mask = 0xf << (low * 4);
        uint8_t flags = 0x3 << (low * 4);
        uint16_t reg = 0;

        MPC83XX_GTM_CHECK_INDEX( timer);

        rtems_interrupt_disable( level);

        reg = mpc83xx.gtm [module].gtcfr [high].reg;
        mpc83xx.gtm [module].gtcfr [high].reg = (reg & ~mask) | flags;

        mpc83xx.gtm [module].gt_tim_regs [high].gtmdr [low] = 0;

        rtems_interrupt_enable( level);

        sc = mpc83xx_gtm_set_clock( timer, clock);
        CHECK_SC( sc, "Set clock");

        sc = mpc83xx_gtm_set_value( timer, 0);
        CHECK_SC( sc, "Set value");

        sc = mpc83xx_gtm_set_reference( timer, 0);
        CHECK_SC( sc, "Set reference");

        sc = mpc83xx_gtm_set_prescale( timer, 0);
        CHECK_SC( sc, "Set prescale");

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_enable_restart( int timer, bool enable)
{
        MPC83XX_GTM_VARIABLES( timer);

        MPC83XX_GTM_CHECK_INDEX( timer);

        rtems_interrupt_disable( level);

        if (enable) {
                mpc83xx.gtm [module].gt_tim_regs [high].gtmdr [low] |= 0x0008;
        } else {
                mpc83xx.gtm [module].gt_tim_regs [high].gtmdr [low] &= ~0x0008;
        }

        rtems_interrupt_enable( level);

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_set_clock( int timer, int clock)
{
        MPC83XX_GTM_VARIABLES( timer);

        uint16_t reg = 0;

        MPC83XX_GTM_CHECK_INDEX( timer);

        if (clock & ~MPC83XX_GTM_CLOCK_MASK) {
                return RTEMS_INVALID_CLOCK;
        }

        rtems_interrupt_disable( level);

        reg = mpc83xx.gtm [module].gt_tim_regs [high].gtmdr [low];
        mpc83xx.gtm [module].gt_tim_regs [high].gtmdr [low] = (reg & ~MPC83XX_GTM_CLOCK_MASK) | clock;

        rtems_interrupt_enable( level);

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_get_clock( int timer, int *clock)
{
        MPC83XX_GTM_VARIABLES( timer);

        MPC83XX_GTM_CHECK_INDEX( timer);

        *clock = mpc83xx.gtm [module].gt_tim_regs [high].gtmdr [low] & MPC83XX_GTM_CLOCK_MASK;

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_start( int timer)
{
        MPC83XX_GTM_VARIABLES( timer);

        uint8_t flags = 0x2 << (low * 4);

        MPC83XX_GTM_CHECK_INDEX( timer);

        rtems_interrupt_disable( level);
        mpc83xx.gtm [module].gtcfr [high].reg &= ~flags;
        rtems_interrupt_enable( level);

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_stop( int timer)
{
        MPC83XX_GTM_VARIABLES( timer);

        uint8_t flags = 0x2 << (low * 4);

        MPC83XX_GTM_CHECK_INDEX( timer);

        rtems_interrupt_disable( level);
        mpc83xx.gtm [module].gtcfr [high].reg |= flags;
        rtems_interrupt_enable( level);

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_set_value( int timer, uint16_t value)
{
        MPC83XX_GTM_VARIABLES( timer);

        MPC83XX_GTM_CHECK_INDEX( timer);

        mpc83xx.gtm [module].gt_tim_regs [high].gtcnr [low] = value;

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_get_value( int timer, uint16_t *value)
{
        MPC83XX_GTM_VARIABLES( timer);

        MPC83XX_GTM_CHECK_INDEX( timer);

        *value = mpc83xx.gtm [module].gt_tim_regs [high].gtcnr [low];

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_set_reference( int timer, uint16_t reference)
{
        MPC83XX_GTM_VARIABLES( timer);

        MPC83XX_GTM_CHECK_INDEX( timer);

        mpc83xx.gtm [module].gt_tim_regs [high].gtrfr [low] = reference;

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_get_reference( int timer, uint16_t *reference)
{
        MPC83XX_GTM_VARIABLES( timer);

        MPC83XX_GTM_CHECK_INDEX( timer);

        *reference = mpc83xx.gtm [module].gt_tim_regs [high].gtrfr [low];

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_set_prescale( int timer, uint8_t prescale)
{
        MPC83XX_GTM_VARIABLES( timer);

        MPC83XX_GTM_CHECK_INDEX( timer);

        mpc83xx.gtm [module].gtpsr [module_timer] = prescale;

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_get_prescale( int timer, uint8_t *prescale)
{
        MPC83XX_GTM_VARIABLES( timer);

        MPC83XX_GTM_CHECK_INDEX( timer);

        *prescale = mpc83xx.gtm [module].gtpsr [module_timer];

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_interrupt_get_vector( int timer, rtems_vector_number *vector)
{
        MPC83XX_GTM_CHECK_INDEX( timer);

        *vector = mpc83xx_gmt_interrupt_vector_table [timer];

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_interrupt_enable( int timer)
{
        MPC83XX_GTM_VARIABLES( timer);

        MPC83XX_GTM_CHECK_INDEX( timer);

        rtems_interrupt_disable( level);
        mpc83xx.gtm [module].gt_tim_regs [high].gtmdr [low] |= 0x0010;
        rtems_interrupt_enable( level);

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_interrupt_disable( int timer)
{
        MPC83XX_GTM_VARIABLES( timer);

        MPC83XX_GTM_CHECK_INDEX( timer);

        rtems_interrupt_disable( level);
        mpc83xx.gtm [module].gt_tim_regs [high].gtmdr [low] &= ~0x0010;
        rtems_interrupt_enable( level);

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_interrupt_clear( int timer)
{
        MPC83XX_GTM_VARIABLES( timer);

        MPC83XX_GTM_CHECK_INDEX( timer);

        mpc83xx.gtm [module].gtevr [module_timer] = 0x0002;

        return RTEMS_SUCCESSFUL;
}