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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 <bsp/fatal.h>
#include <rtems/rtems/intr.h>
#include <ambapp.h>
#include <rtems/score/profiling.h>
#include <rtems/timecounter.h>
/* The LEON3 BSP Timer driver can rely on the Driver Manager if the
* DrvMgr is initialized during startup. Otherwise the classic driver
* must be used.
*
* The DrvMgr Clock driver is located in the shared/timer directory
*/
#ifndef RTEMS_DRVMGR_STARTUP
#if SIMSPARC_FAST_IDLE==1
#define CLOCK_DRIVER_USE_FAST_IDLE 1
#endif
/* LEON3 Timer system interrupt number */
static int clkirq;
static bool leon3_tc_use_irqmp;
static rtems_timecounter_simple leon3_tc;
static uint32_t leon3_tc_get(rtems_timecounter_simple *tc)
{
return LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].value;
}
static bool leon3_tc_is_pending(rtems_timecounter_simple *tc)
{
return LEON_Is_interrupt_pending(clkirq);
}
static uint32_t leon3_tc_get_timecount(struct timecounter *tc)
{
return rtems_timecounter_simple_downcounter_get(
tc,
leon3_tc_get,
leon3_tc_is_pending
);
}
static uint32_t leon3_tc_get_timecount_irqmp(struct timecounter *tc)
{
return LEON3_IrqCtrl_Regs->timestamp[0].counter;
}
static void leon3_tc_tick(void)
{
if (leon3_tc_use_irqmp) {
rtems_timecounter_tick();
} else {
rtems_timecounter_simple_downcounter_tick(&leon3_tc, leon3_tc_get);
}
}
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)
#define Adjust_clkirq_for_node() do { clkirq += LEON3_CLOCK_INDEX; } while(0)
#define Clock_driver_support_find_timer() \
do { \
/* Assume timer found during BSP initialization */ \
if (LEON3_Timer_Regs) { \
clkirq = (LEON3_Timer_Regs->cfg & 0xf8) >> 3; \
\
Adjust_clkirq_for_node(); \
} \
} while (0)
#define Clock_driver_support_install_isr( _new, _old ) \
do { \
(_old) = NULL; \
bsp_clock_handler_install(_new); \
} while(0)
static void bsp_clock_handler_install(rtems_isr *new)
{
rtems_status_code sc;
sc = rtems_interrupt_handler_install(
clkirq,
"Clock",
RTEMS_INTERRUPT_UNIQUE,
new,
NULL
);
if (sc != RTEMS_SUCCESSFUL) {
rtems_fatal(RTEMS_FATAL_SOURCE_BSP, LEON3_FATAL_CLOCK_INITIALIZATION);
}
}
static void leon3_clock_initialize(void)
{
volatile struct irqmp_timestamp_regs *irqmp_ts =
&LEON3_IrqCtrl_Regs->timestamp[0];
LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].reload =
rtems_configuration_get_microseconds_per_tick() - 1;
LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].ctrl =
GPTIMER_TIMER_CTRL_EN | GPTIMER_TIMER_CTRL_RS |
GPTIMER_TIMER_CTRL_LD | GPTIMER_TIMER_CTRL_IE;
if (leon3_irqmp_has_timestamp(irqmp_ts)) {
leon3_tc.tc.tc_get_timecount = leon3_tc_get_timecount_irqmp;
leon3_tc.tc.tc_counter_mask = 0xffffffff;
leon3_tc.tc.tc_frequency = ambapp_freq_get(&ambapp_plb, LEON3_Timer_Adev);
leon3_tc.tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
leon3_tc_use_irqmp = true;
rtems_timecounter_install(&leon3_tc.tc);
} else {
rtems_timecounter_simple_install(
&leon3_tc,
LEON3_GPTIMER_0_FREQUENCY_SET_BY_BOOT_LOADER,
rtems_configuration_get_microseconds_per_tick(),
leon3_tc_get_timecount
);
}
}
#define Clock_driver_support_initialize_hardware() \
leon3_clock_initialize()
#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)
#define Clock_driver_timecounter_tick() leon3_tc_tick()
#include "../../../shared/clockdrv_shell.h"
#endif
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