source: rtems/bsps/powerpc/gen83xx/dev/gtm.c @ 762fa62

/**
 * @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.org/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 GTM_MODULE(timer)       ((timer)/4)
#define GTM_MODULE_TIMER(timer) ((timer)%4)
#define GTM_HIGH(timer)         (GTM_MODULE_TIMER(timer)/2)
#define GTM_LOW(timer)          (GTM_MODULE_TIMER(timer)%2)

#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 };

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

        unsigned mask = 0xfU << (GTM_LOW(timer) * 4);
        unsigned flags = 0x3U << (GTM_LOW(timer) * 4);
        uint8_t reg = 0;

        MPC83XX_GTM_CHECK_INDEX( timer);

        rtems_interrupt_disable( level);

        reg = mpc83xx.gtm [GTM_MODULE(timer)].gtcfr [GTM_HIGH(timer)].reg;
        mpc83xx.gtm [GTM_MODULE(timer)].gtcfr [GTM_HIGH(timer)].reg = 
          (uint8_t) ((reg & ~mask) | flags);

        mpc83xx.gtm [GTM_MODULE(timer)]
          .gt_tim_regs [GTM_HIGH(timer)]
          .gtmdr [GTM_LOW(timer)] = 0;

        rtems_interrupt_enable( level);

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

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

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

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

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_enable_restart( int timer, bool enable)
{
        rtems_interrupt_level level;
        MPC83XX_GTM_CHECK_INDEX( timer);

        rtems_interrupt_disable( level);

        if (enable) {
                mpc83xx.gtm [GTM_MODULE(timer)]
                  .gt_tim_regs [GTM_HIGH(timer)]
                  .gtmdr [GTM_LOW(timer)] |= 0x0008;
        } else {
                mpc83xx.gtm [GTM_MODULE(timer)]
                  .gt_tim_regs [GTM_HIGH(timer)]
                  .gtmdr [GTM_LOW(timer)] &= ~0x0008;
        }

        rtems_interrupt_enable( level);

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_set_clock( int timer, int clock)
{
        rtems_interrupt_level level;
        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 [GTM_MODULE(timer)]
          .gt_tim_regs [GTM_HIGH(timer)]
          .gtmdr [GTM_LOW(timer)];
        mpc83xx.gtm [GTM_MODULE(timer)]
          .gt_tim_regs [GTM_HIGH(timer)]
          .gtmdr [GTM_LOW(timer)] = (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_CHECK_INDEX( timer);

        *clock = mpc83xx.gtm [GTM_MODULE(timer)]
          .gt_tim_regs [GTM_HIGH(timer)]
          .gtmdr [GTM_LOW(timer)] & MPC83XX_GTM_CLOCK_MASK;

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_start( int timer)
{
        rtems_interrupt_level level;
        uint8_t flags = 0x2 << (GTM_LOW(timer) * 4);

        MPC83XX_GTM_CHECK_INDEX( timer);

        rtems_interrupt_disable( level);
        mpc83xx.gtm [GTM_MODULE(timer)]
.gtcfr [GTM_HIGH(timer)].reg &= ~flags;
        rtems_interrupt_enable( level);

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_stop( int timer)
{
        rtems_interrupt_level level;
        uint8_t flags = 0x2 << (GTM_LOW(timer) * 4);

        MPC83XX_GTM_CHECK_INDEX( timer);

        rtems_interrupt_disable( level);
        mpc83xx.gtm [GTM_MODULE(timer)].gtcfr [GTM_HIGH(timer)].reg |= flags;
        rtems_interrupt_enable( level);

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_set_value( int timer, uint16_t value)
{
        MPC83XX_GTM_CHECK_INDEX( timer);

        mpc83xx.gtm [GTM_MODULE(timer)].gt_tim_regs [GTM_HIGH(timer)].gtcnr [GTM_LOW(timer)] = value;

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_get_value( int timer, uint16_t *value)
{
        MPC83XX_GTM_CHECK_INDEX( timer);

        *value = mpc83xx.gtm [GTM_MODULE(timer)].gt_tim_regs [GTM_HIGH(timer)].gtcnr [GTM_LOW(timer)];

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_set_reference( int timer, uint16_t reference)
{
        MPC83XX_GTM_CHECK_INDEX( timer);

        mpc83xx.gtm [GTM_MODULE(timer)].gt_tim_regs [GTM_HIGH(timer)].gtrfr [GTM_LOW(timer)] = reference;

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_get_reference( int timer, uint16_t *reference)
{
        MPC83XX_GTM_CHECK_INDEX( timer);

        *reference = mpc83xx.gtm [GTM_MODULE(timer)].gt_tim_regs [GTM_HIGH(timer)].gtrfr [GTM_LOW(timer)];

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_set_prescale( int timer, uint8_t prescale)
{
        MPC83XX_GTM_CHECK_INDEX( timer);

        mpc83xx.gtm [GTM_MODULE(timer)].gtpsr [GTM_MODULE_TIMER(timer)] = prescale;

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_get_prescale( int timer, uint8_t *prescale)
{
        MPC83XX_GTM_CHECK_INDEX( timer);

        *prescale = mpc83xx.gtm [GTM_MODULE(timer)].gtpsr [GTM_MODULE_TIMER(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)
{
        rtems_interrupt_level level;
        MPC83XX_GTM_CHECK_INDEX( timer);

        rtems_interrupt_disable( level);
        mpc83xx.gtm [GTM_MODULE(timer)].gt_tim_regs [GTM_HIGH(timer)].gtmdr [GTM_LOW(timer)] |= 0x0010;
        rtems_interrupt_enable( level);

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_interrupt_disable( int timer)
{
        rtems_interrupt_level level;
        MPC83XX_GTM_CHECK_INDEX( timer);

        rtems_interrupt_disable( level);
        mpc83xx.gtm [GTM_MODULE(timer)].gt_tim_regs [GTM_HIGH(timer)].gtmdr [GTM_LOW(timer)] &= ~0x0010;
        rtems_interrupt_enable( level);

        return RTEMS_SUCCESSFUL;
}

rtems_status_code mpc83xx_gtm_interrupt_clear( int timer)
{
        MPC83XX_GTM_CHECK_INDEX( timer);

        mpc83xx.gtm [GTM_MODULE(timer)].gtevr [GTM_MODULE_TIMER(timer)] = 0x0002;

        return RTEMS_SUCCESSFUL;
}