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/*
* Clock Tick Device Driver
*
* This routine initializes LEON timer 1 which used for the clock tick.
*
* The tick frequency is directly programmed to the configured number of
* microseconds per tick.
*
* COPYRIGHT (c) 1989-2006.
* On-Line Applications Research Corporation (OAR).
*
* Modified for LEON3 BSP.
* COPYRIGHT (c) 2004.
* Gaisler Research.
*
* 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 <bsp.h>
#include <bspopts.h>
#include <ambapp.h>
#if SIMSPARC_FAST_IDLE==1
#define CLOCK_DRIVER_USE_FAST_IDLE 1
#endif
/*
* The Real Time Clock Counter Timer uses this trap type.
*/
#if defined(RTEMS_MULTIPROCESSING)
#define LEON3_CLOCK_INDEX \
(rtems_configuration_get_user_multiprocessing_table() ? LEON3_Cpu_Index : 0)
#else
#define LEON3_CLOCK_INDEX 0
#endif
volatile struct gptimer_regs *LEON3_Timer_Regs = 0;
static int clkirq;
#define CLOCK_VECTOR LEON_TRAP_TYPE( clkirq )
#define Clock_driver_support_at_tick()
#if defined(RTEMS_MULTIPROCESSING)
#define Adjust_clkirq_for_node() \
do { \
if (rtems_configuration_get_user_multiprocessing_table() != NULL) { \
clkirq += LEON3_Cpu_Index; \
} \
} while(0)
#else
#define Adjust_clkirq_for_node() do { clkirq += LEON3_CLOCK_INDEX; } while(0)
#endif
#define Clock_driver_support_find_timer() \
do { \
struct ambapp_dev *adev; \
\
/* Find first LEON3 GP Timer */ \
adev = (void *)ambapp_for_each(&ambapp_plb, (OPTIONS_ALL|OPTIONS_APB_SLVS),\
VENDOR_GAISLER, GAISLER_GPTIMER, ambapp_find_by_idx, NULL); \
if (adev) { \
/* Found APB GPTIMER Timer */ \
LEON3_Timer_Regs = (volatile struct gptimer_regs *) \
DEV_TO_APB(adev)->start; \
clkirq = (LEON3_Timer_Regs->cfg & 0xf8) >> 3; \
\
Adjust_clkirq_for_node(); \
} \
} while (0)
#define Clock_driver_support_install_isr( _new, _old ) \
do { \
_old = set_vector( _new, CLOCK_VECTOR, 1 ); \
} while(0)
#define Clock_driver_support_initialize_hardware() \
do { \
LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].reload = \
rtems_configuration_get_microseconds_per_tick() - 1; \
\
LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].ctrl = \
LEON3_GPTIMER_EN | LEON3_GPTIMER_RL | \
LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN; \
} while (0)
#define Clock_driver_support_shutdown_hardware() \
do { \
LEON_Mask_interrupt(LEON_TRAP_TYPE(clkirq)); \
LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].ctrl = 0; \
} while (0)
uint32_t bsp_clock_nanoseconds_since_last_tick(void)
{
uint32_t clicks;
uint32_t usecs;
if ( !LEON3_Timer_Regs )
return 0;
clicks = LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].value;
if ( LEON_Is_interrupt_pending( clkirq ) ) {
clicks = LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].value;
usecs = (2*rtems_configuration_get_microseconds_per_tick() - clicks);
} else {
usecs = (rtems_configuration_get_microseconds_per_tick() - clicks);
}
return usecs * 1000;
}
#define Clock_driver_nanoseconds_since_last_tick \
bsp_clock_nanoseconds_since_last_tick
#include "../../../shared/clockdrv_shell.h"
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