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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.org/license/LICENSE.
*/
#include <bsp.h>
#include <bspopts.h>
#include <ambapp.h>
#include <rtems/score/profiling.h>
#if SIMSPARC_FAST_IDLE==1
#define CLOCK_DRIVER_USE_FAST_IDLE 1
#endif
/*
* The Real Time Clock Counter Timer uses this trap type.
*/
volatile struct gptimer_regs *LEON3_Timer_Regs = 0;
static int clkirq;
#define CLOCK_VECTOR LEON_TRAP_TYPE( clkirq )
static void leon3_clock_profiling_interrupt_delay(void)
{
#ifdef RTEMS_PROFILING
/*
* We need a small state machine to ignore the first clock interrupt, since
* it contains the sequential system initialization time. Do the timestamp
* initialization on the fly.
*/
static int state = 1;
volatile struct irqmp_timestamp_regs *irqmp_ts =
&LEON3_IrqCtrl_Regs->timestamp[0];
unsigned int s1_s2 = (1U << 25) | (1U << 26);
if (state == 0) {
unsigned int first = irqmp_ts->assertion;
unsigned int second = irqmp_ts->counter;
irqmp_ts->control |= s1_s2;
_Profiling_Update_max_interrupt_delay(_Per_CPU_Get(), second - first);
} else if (state == 1 && leon3_irqmp_has_timestamp(irqmp_ts)) {
unsigned int ks = 1U << 5;
state = 0;
irqmp_ts->control = ks | s1_s2 | (unsigned int) clkirq;
} else if (state == 1) {
state = 2;
}
#endif
}
#define Clock_driver_support_at_tick() \
do { \
leon3_clock_profiling_interrupt_delay(); \
} while (0)
#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)
static 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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