From 1480c3f5e8a7c376cde4eff5699d76672d3d901f Mon Sep 17 00:00:00 2001 From: Kinsey Moore Date: Thu, 27 Aug 2020 22:07:52 -0500 Subject: bsps: Break out AArch32 portions of GPT driver This breaks AArch32-specific portions of the ARM GPT driver into their own file so that the generic code can be moved for reuse by other architectures. --- bsps/shared/dev/clock/arm-generic-timer.c | 174 ++++++++++++++++++++++++++++++ 1 file changed, 174 insertions(+) create mode 100644 bsps/shared/dev/clock/arm-generic-timer.c (limited to 'bsps/shared') diff --git a/bsps/shared/dev/clock/arm-generic-timer.c b/bsps/shared/dev/clock/arm-generic-timer.c new file mode 100644 index 0000000000..f0f29e706f --- /dev/null +++ b/bsps/shared/dev/clock/arm-generic-timer.c @@ -0,0 +1,174 @@ +/* + * Copyright (c) 2017 embedded brains GmbH. All rights reserved. + * + * embedded brains GmbH + * Dornierstr. 4 + * 82178 Puchheim + * Germany + * + * + * 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 +#include +#include +#include +#include + +#include +#include +#include +#include + +/* + * Clock driver using the ARMv7-AR/AArch64 Generic Timer. The BSP must provide the + * following function: + * + * void arm_generic_timer_get_config(uint32_t *frequency, uint32_t *irq); + * + * The BSP may optionally define ARM_GENERIC_TIMER_USE_VIRTUAL in 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 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); +#ifdef ARM_GENERIC_TIMER_UNMASK_AT_TICK + arm_gt_clock_set_control(0x1); +#endif /* ARM_GENERIC_TIMER_UNMASK_AT_TICK */ +} + +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; + + tc = &arm_gt_clock_instance.tc; + frequency = tc->tc_frequency; + 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->tc_get_timecount = arm_gt_clock_get_timecount; + tc->tc_counter_mask = 0xffffffff; + 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) +{ + uint32_t frequency; + arm_gt_clock_set_control(0x3); + + arm_generic_timer_get_config( + &frequency, + &arm_gt_clock_instance.irq + ); + + /* + * Used by _CPU_Counter_frequency() before arm_gt_clock_initialize() is + * called. + */ + arm_gt_clock_instance.tc.tc_frequency = frequency; +} + +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" -- cgit v1.2.3