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grtimer.c
grtimer.c 7.97 KiB
/**
* @file arch/sparc/lib/grtimer.c
* @ingroup time
* @author Armin Luntzer (armin.luntzer@univie.ac.at),
* @date July, 2016
*
* @copyright GPLv2
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
*
* @brief Implements access to the LEON3 General Purpose Timer Unit with
* Time Latch Capability
*
* @see GR712RC user manual chapter 12
*/
#include <asm/io.h>
#include <grtimer.h>
/**
* @brief set scaler reload value of the timer block
* @param rtu a struct grtimer_unit
*
*/
void grtimer_set_scaler_reload(struct grtimer_unit *rtu, uint32_t value)
{
iowrite32be(value, &rtu->scaler_reload);
}
/**
* @brief get scaler reload value of the timer block
* @param rtu a struct grtimer_unit
*
*/
uint32_t grtimer_get_scaler_reload(struct grtimer_unit *rtu)
{
return ioread32be(&rtu->scaler_reload);
}
/**
* @brief sets the interrupt enabled flag of a timer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
void grtimer_set_interrupt_enabled(struct grtimer_unit *rtu, uint32_t timer)
{
uint32_t flags;
flags = ioread32be(&rtu->timer[timer].ctrl);
flags |= LEON3_TIMER_IE;
iowrite32be(flags, &rtu->timer[timer].ctrl);
}
/** * @brief sets the interrupt enabled flag of a timer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
void grtimer_clear_interrupt_enabled(struct grtimer_unit *rtu, uint32_t timer)
{
uint32_t flags;
flags = ioread32be(&rtu->timer[timer].ctrl);
flags &= ~LEON3_TIMER_IE;
iowrite32be(flags, &rtu->timer[timer].ctrl);
}
/**
* @brief sets the load flag of a timer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
void grtimer_set_load(struct grtimer_unit *rtu, uint32_t timer)
{
uint32_t flags;
flags = ioread32be(&rtu->timer[timer].ctrl);
flags |= LEON3_TIMER_LD;
iowrite32be(flags, &rtu->timer[timer].ctrl);
}
/**
* @brief clears the load flag of a timer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
void grtimer_clear_load(struct grtimer_unit *rtu, uint32_t timer)
{
uint32_t flags;
flags = ioread32be(&rtu->timer[timer].ctrl);
flags &= ~LEON3_TIMER_LD;
iowrite32be(flags, &rtu->timer[timer].ctrl);
}
/**
* @brief set enable flag in timer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
void grtimer_set_enabled(struct grtimer_unit *rtu, uint32_t timer)
{
uint32_t ctrl;
ctrl = ioread32be(&rtu->timer[timer].ctrl);
ctrl |= LEON3_TIMER_EN;
iowrite32be(ctrl, &rtu->timer[timer].ctrl);
}
/**
* @brief clear enable flag in timer
* @param rtu a struct grtimer_unit * @param timer the selected timer
*/
void grtimer_clear_enabled(struct grtimer_unit *rtu, uint32_t timer)
{
uint32_t ctrl;
ctrl = ioread32be(&rtu->timer[timer].ctrl);
ctrl &= ~LEON3_TIMER_EN;
iowrite32be(ctrl, &rtu->timer[timer].ctrl);
}
/**
* @brief set restart flag in timer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
void grtimer_set_restart(struct grtimer_unit *rtu, uint32_t timer)
{
uint32_t ctrl;
ctrl = ioread32be(&rtu->timer[timer].ctrl);
ctrl |= LEON3_TIMER_RS;
iowrite32be(ctrl, &rtu->timer[timer].ctrl);
}
/**
* @brief clear restart flag in timer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
void grtimer_clear_restart(struct grtimer_unit *rtu, uint32_t timer)
{
uint32_t ctrl;
ctrl = ioread32be(&rtu->timer[timer].ctrl);
ctrl &= ~LEON3_TIMER_RS;
iowrite32be(ctrl, &rtu->timer[timer].ctrl);
}
/**
* @brief set timer to chain to the preceeding timer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
void grtimer_set_chained(struct grtimer_unit *rtu, uint32_t timer)
{
uint32_t ctrl;
ctrl = ioread32be(&rtu->timer[timer].ctrl);
ctrl |= LEON3_TIMER_CH;
iowrite32be(ctrl, &rtu->timer[timer].ctrl);
}
/**
* @brief clear timer to chain to the preceeding timer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
void grtimer_clear_chained(struct grtimer_unit *rtu, uint32_t timer)
{
uint32_t ctrl;
ctrl = ioread32be(&rtu->timer[timer].ctrl);
ctrl &= ~LEON3_TIMER_CH;
iowrite32be(ctrl, &rtu->timer[timer].ctrl);
}
/**
* @brief get status of interrupt pending status
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
uint32_t grtimer_get_interrupt_pending_status(struct grtimer_unit *rtu,
uint32_t timer)
{
return ioread32be(&rtu->timer[timer].ctrl) & LEON3_TIMER_IP;
}
/**
* @brief clear status of interrupt pending status
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
void grtimer_clear_interrupt_pending_status(struct grtimer_unit *rtu,
uint32_t timer)
{
uint32_t ctrl;
ctrl = ioread32be(&rtu->timer[timer].ctrl);
ctrl &= ~LEON3_TIMER_IP;
iowrite32be(ctrl, &rtu->timer[timer].ctrl);
}
/**
* @brief get number of implemented general purpose timers
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
uint32_t grtimer_get_num_implemented(struct grtimer_unit *rtu)
{
return ioread32be(&rtu->config) & LEON3_CFG_TIMERS_MASK;
}
/**
* @brief get interrupt ID of first implemented timer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
uint32_t grtimer_get_first_timer_irq_id(struct grtimer_unit *rtu)
{
return (ioread32be(&rtu->config) & LEON3_CFG_IRQNUM_MASK) >>
LEON3_CFG_IRQNUM_SHIFT;
}
/**
* @brief set the value of a grtimer * @param rtu a struct grtimer_unit
* @param timer the selected timer
* @param value the timer counter value to set
*/
void grtimer_set_value(struct grtimer_unit *rtu, uint32_t timer, uint32_t value)
{
iowrite32be(value, &rtu->timer[timer].value);
}
/**
* @brief get the value of a grtimer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
* @param value the timer counter value to set
*/
uint32_t grtimer_get_value(struct grtimer_unit *rtu, uint32_t timer)
{
return ioread32be(&rtu->timer[timer].value);
}
/**
* @brief set the reload of a grtimer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
* @param reload the timer counter reload to set
*/
void grtimer_set_reload(struct grtimer_unit *rtu,
uint32_t timer,
uint32_t reload)
{
iowrite32be(reload, &rtu->timer[timer].reload);
}
/**
* @brief get the reload of a grtimer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
uint32_t grtimer_get_reload(struct grtimer_unit *rtu, uint32_t timer)
{
return ioread32be(&rtu->timer[timer].reload);
}
/**
* @brief set an irq to trigger a latch
* @param rtu a struct grtimer_unit
* @param irq the irq number to latch on
*/
void grtimer_set_latch_irq(struct grtimer_unit *rtu, uint32_t irq)
{
uint32_t irq_select;
irq_select = ioread32be(&rtu->irq_select);
irq_select |= (1 << irq);
iowrite32be(irq_select, &rtu->irq_select);
}
/**
* @brief clear an irq triggering a latch
* @param rtu a struct grtimer_unit
* @param irq the irq number to disable latching for
*/
void grtimer_clear_latch_irq(struct grtimer_unit *rtu, uint32_t irq)
{
uint32_t irq_select;
irq_select = ioread32be(&rtu->irq_select);
irq_select &= ~(1 << irq);
iowrite32be(irq_select, &rtu->irq_select);
}
/**
* @brief set the timer's latch bit
* @param rtu a struct grtimer_unit
*/
void grtimer_enable_latch(struct grtimer_unit *rtu)
{
uint32_t config;
config = ioread32be(&rtu->config);
config |= LEON3_GRTIMER_CFG_LATCH;
iowrite32be(config, &rtu->config);
}
/**
* @brief get the latch value of a grtimer
* @param rtu a struct grtimer_unit
* @param timer the selected timer
*/
uint32_t grtimer_get_latch_value(struct grtimer_unit *rtu, uint32_t timer)
{
return ioread32be(&rtu->timer[timer].latch_value);
}