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/*
* Clock Tick Device Driver
*
* This routine initializes GRLIB gptimer 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 GRLIB BSP.
* COPYRIGHT (c) 2004.
* Gaisler Research.
*
* Copyright (c) 2014, 2018 embedded brains GmbH
*
* 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 <amba.h>
#include <bsp/irq.h>
#include <bspopts.h>
#include <bsp/fatal.h>
#include <rtems/rtems/intr.h>
#include <grlib/ambapp.h>
#include <rtems/score/profiling.h>
#include <rtems/timecounter.h>
#include <rtems/score/cpuimpl.h>
#include <rtems/score/riscv-utility.h>
volatile uint32_t _RISCV_Counter_register;
/* The GRLIB 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
/* GRLIB Timer system interrupt number */
static int clkirq;
static void (*grlib_tc_tick)(void);
static struct timecounter grlib_tc;
#ifdef RTEMS_PROFILING
#define IRQMP_TIMESTAMP_S1_S2 ((1U << 25) | (1U << 26))
static void grlib_tc_tick_irqmp_timestamp(void)
{
volatile struct irqmp_timestamp_regs *irqmp_ts =
&GRLIB_IrqCtrl_Regs->timestamp[0];
unsigned int first = irqmp_ts->assertion;
unsigned int second = irqmp_ts->counter;
irqmp_ts->control |= IRQMP_TIMESTAMP_S1_S2;
_Profiling_Update_max_interrupt_delay(_Per_CPU_Get(), second - first);
rtems_timecounter_tick();
}
#endif
static void grlib_tc_tick_irqmp_timestamp_init(void)
{
#ifdef RTEMS_PROFILING
/*
* Ignore the first clock interrupt, since it contains the sequential system
* initialization time. Do the timestamp initialization on the fly.
*/
#ifdef RTEMS_SMP
static Atomic_Uint counter = ATOMIC_INITIALIZER_UINT(0);
bool done =
_Atomic_Fetch_add_uint(&counter, 1, ATOMIC_ORDER_RELAXED)
== rtems_scheduler_get_processor_maximum() - 1;
#else
bool done = true;
#endif
volatile struct irqmp_timestamp_regs *irqmp_ts =
&GRLIB_IrqCtrl_Regs->timestamp[0];
unsigned int ks = 1U << 5;
irqmp_ts->control = ks | IRQMP_TIMESTAMP_S1_S2 | (unsigned int) clkirq;
if (done) {
grlib_tc_tick = grlib_tc_tick_irqmp_timestamp;
}
#endif
rtems_timecounter_tick();
}
static void grlib_tc_do_tick(void)
{
(*grlib_tc_tick)();
}
#define Adjust_clkirq_for_node() do { clkirq += GRLIB_CLOCK_INDEX; } while(0)
#define Clock_driver_support_find_timer() \
do { \
/* Assume timer found during BSP initialization */ \
if (GRLIB_Timer_Regs) { \
clkirq = (GRLIB_Timer_Regs->cfg & 0xf8) >> 3; \
\
Adjust_clkirq_for_node(); \
} \
} while (0)
#define Clock_driver_support_install_isr( _new ) \
bsp_clock_handler_install(_new)
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);
}
}
#define Clock_driver_support_set_interrupt_affinity(online_processors) \
bsp_interrupt_set_affinity(clkirq, online_processors)
uint32_t _CPU_Counter_frequency( void )
{
return grlib_up_counter_frequency();
}
static uint32_t _RISCV_Get_timecount_csr(struct timecounter *tc)
{
return read_csr(time);
}
static void grlib_clock_initialize(void)
{
volatile struct gptimer_regs *gpt;
struct timecounter *tc;
gpt = GRLIB_Timer_Regs;
tc = &grlib_tc;
gpt->timer[GRLIB_CLOCK_INDEX].reload =
rtems_configuration_get_microseconds_per_tick() - 1;
gpt->timer[GRLIB_CLOCK_INDEX].ctrl =
GPTIMER_TIMER_CTRL_EN | GPTIMER_TIMER_CTRL_RS |
GPTIMER_TIMER_CTRL_LD | GPTIMER_TIMER_CTRL_IE;
/* Use the RISCV time register as up-counter */
tc->tc_get_timecount = _RISCV_Get_timecount_csr;
tc->tc_frequency = grlib_up_counter_frequency();
#ifdef RTEMS_PROFILING
volatile struct irqmp_timestamp_regs *irqmp_ts =
&GRLIB_IrqCtrl_Regs->timestamp[0];
if (!irqmp_has_timestamp(irqmp_ts)) {
bsp_fatal(GRLIB_FATAL_CLOCK_NO_IRQMP_TIMESTAMP_SUPPORT);
}
#endif
grlib_tc_tick = grlib_tc_tick_irqmp_timestamp_init;
tc->tc_counter_mask = 0xffffffff;
tc->tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
rtems_timecounter_install(tc);
}
CPU_Counter_ticks _CPU_Counter_read( void )
{
unsigned long timec;
__asm__ volatile ( "csrr %0, time" : "=&r" ( timec ) );
return timec;
}
#define Clock_driver_support_initialize_hardware() \
grlib_clock_initialize()
#define Clock_driver_timecounter_tick() grlib_tc_do_tick()
#include "../../../shared/dev/clock/clockimpl.h"
#endif
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