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/*
* Copyright (c) 2017 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <info@embedded-brains.de>
*
* 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 <bsp/fatal.h>
#include <bsp/irq.h>
#include <bsp/irq-generic.h>
#include <rtems/counter.h>
#include <rtems/sysinit.h>
#include <rtems/timecounter.h>
#include <rtems/score/smpimpl.h>
#include <libcpu/arm-cp15.h>
/*
* Clock driver using the ARMv7-AR Generic Timer. The BSP must provide the
* following function via <bsp.h>:
*
* void arm_generic_timer_get_config(uint32_t *frequency, uint32_t *irq);
*
* The BSP may optionally define ARM_GENERIC_TIMER_USE_VIRTUAL in <bsp.h> to
* use the virtual timer instead of the physical timer.
*/
typedef struct {
struct timecounter tc;
uint32_t interval;
rtems_vector_number irq;
} arm_gt_clock_context;
static arm_gt_clock_context arm_gt_clock_instance;
/* This is defined in dev/clock/clockimpl.h */
void Clock_isr(rtems_irq_hdl_param arg);
static inline uint64_t arm_gt_clock_get_compare_value(void)
{
#ifdef ARM_GENERIC_TIMER_USE_VIRTUAL
return arm_cp15_get_counter_pl1_virtual_compare_value();
#else
return arm_cp15_get_counter_pl1_physical_compare_value();
#endif
}
static inline void arm_gt_clock_set_compare_value(uint64_t cval)
{
#ifdef ARM_GENERIC_TIMER_USE_VIRTUAL
arm_cp15_set_counter_pl1_virtual_compare_value(cval);
#else
arm_cp15_set_counter_pl1_physical_compare_value(cval);
#endif
}
static inline uint64_t arm_gt_clock_get_count(void)
{
#ifdef ARM_GENERIC_TIMER_USE_VIRTUAL
return arm_cp15_get_counter_virtual_count();
#else
return arm_cp15_get_counter_physical_count();
#endif
}
static inline void arm_gt_clock_set_control(uint32_t ctl)
{
#ifdef ARM_GENERIC_TIMER_USE_VIRTUAL
arm_cp15_set_counter_pl1_virtual_timer_control(ctl);
#else
arm_cp15_set_counter_pl1_physical_timer_control(ctl);
#endif
}
static void arm_gt_clock_at_tick(void)
{
uint64_t cval;
uint32_t interval;
interval = arm_gt_clock_instance.interval;
cval = arm_gt_clock_get_compare_value();
cval += interval;
arm_gt_clock_set_compare_value(cval);
}
static void arm_gt_clock_handler_install(void)
{
rtems_status_code sc;
sc = rtems_interrupt_handler_install(
arm_gt_clock_instance.irq,
"Clock",
RTEMS_INTERRUPT_UNIQUE,
(rtems_interrupt_handler) Clock_isr,
NULL
);
if (sc != RTEMS_SUCCESSFUL) {
bsp_fatal(BSP_ARM_FATAL_GENERIC_TIMER_CLOCK_IRQ_INSTALL);
}
}
static uint32_t arm_gt_clock_get_timecount(struct timecounter *tc)
{
return (uint32_t) arm_gt_clock_get_count();
}
static void arm_gt_clock_gt_init(uint64_t cval)
{
arm_gt_clock_set_compare_value(cval);
arm_gt_clock_set_control(0x1);
}
#if defined(RTEMS_SMP) && !defined(CLOCK_DRIVER_USE_ONLY_BOOT_PROCESSOR)
static void arm_gt_clock_secondary_action(void *arg)
{
uint64_t *cval;
cval = arg;
arm_gt_clock_gt_init(*cval);
bsp_interrupt_vector_enable(arm_gt_clock_instance.irq);
}
#endif
static void arm_gt_clock_secondary_initialization(uint64_t cval)
{
#if defined(RTEMS_SMP) && !defined(CLOCK_DRIVER_USE_ONLY_BOOT_PROCESSOR)
_SMP_Broadcast_action(arm_gt_clock_secondary_action, &cval);
#endif
}
static void arm_gt_clock_initialize(void)
{
uint64_t frequency;
uint64_t us_per_tick;
uint32_t interval;
uint64_t cval;
struct timecounter *tc;
frequency = arm_gt_clock_instance.interval;
us_per_tick = rtems_configuration_get_microseconds_per_tick();
interval = (uint32_t) ((frequency * us_per_tick) / 1000000);
cval = arm_gt_clock_get_count();
cval += interval;
arm_gt_clock_instance.interval = interval;
arm_gt_clock_gt_init(cval);
arm_gt_clock_secondary_initialization(cval);
tc = &arm_gt_clock_instance.tc;
tc->tc_get_timecount = arm_gt_clock_get_timecount;
tc->tc_counter_mask = 0xffffffff;
tc->tc_frequency = frequency;
tc->tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
rtems_timecounter_install(tc);
}
uint32_t _CPU_Counter_frequency(void)
{
return (uint32_t) arm_gt_clock_instance.tc.tc_frequency;
}
CPU_Counter_ticks _CPU_Counter_read(void)
{
return (uint32_t) arm_gt_clock_get_count();
}
static void arm_gt_clock_early_init(void)
{
arm_gt_clock_set_control(0x3);
arm_generic_timer_get_config(
&arm_gt_clock_instance.interval,
&arm_gt_clock_instance.irq
);
}
RTEMS_SYSINIT_ITEM(
arm_gt_clock_early_init,
RTEMS_SYSINIT_CPU_COUNTER,
RTEMS_SYSINIT_ORDER_FIRST
);
#define Clock_driver_support_at_tick() \
arm_gt_clock_at_tick()
#define Clock_driver_support_initialize_hardware() \
arm_gt_clock_initialize()
#define Clock_driver_support_install_isr(isr) \
arm_gt_clock_handler_install()
/* Include shared source clock driver code */
#include "../../shared/dev/clock/clockimpl.h"
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