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/**************************************************************************//**
* @file os_tick_gtim.c
* @brief CMSIS OS Tick implementation for Generic Timer
* @version V1.0.1
* @date 24. November 2017
******************************************************************************/
/*
* Copyright (c) 2017 ARM Limited. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "os_tick.h"
#include "irq_ctrl.h"
#include "RTE_Components.h"
#include CMSIS_device_header
#ifndef GTIM_IRQ_PRIORITY
#define GTIM_IRQ_PRIORITY 0xFFU
#endif
#ifndef GTIM_IRQ_NUM
#define GTIM_IRQ_NUM SecurePhyTimer_IRQn
#endif
// Timer interrupt pending flag
static uint8_t GTIM_PendIRQ;
// Timer tick frequency
static uint32_t GTIM_Clock;
// Timer load value
static uint32_t GTIM_Load;
// Setup OS Tick.
int32_t OS_Tick_Setup (uint32_t freq, IRQHandler_t handler) {
uint32_t prio, bits;
if (freq == 0U) {
return (-1);
}
GTIM_PendIRQ = 0U;
// Get timer clock
#ifdef SCTR_BASE
GTIM_Clock = *(uint32_t*)(SCTR_BASE+0x20);
#else
// FVP REFCLK CNTControl 100MHz
GTIM_Clock = 100000000UL;
#endif
PL1_SetCounterFrequency(GTIM_Clock);
// Calculate load value
GTIM_Load = (GTIM_Clock / freq) - 1U;
// Disable Generic Timer and set load value
PL1_SetControl(0U);
PL1_SetLoadValue(GTIM_Load);
// Disable corresponding IRQ
IRQ_Disable(GTIM_IRQ_NUM);
IRQ_ClearPending(GTIM_IRQ_NUM);
// Determine number of implemented priority bits
IRQ_SetPriority(GTIM_IRQ_NUM, 0xFFU);
prio = IRQ_GetPriority(GTIM_IRQ_NUM);
// At least bits [7:4] must be implemented
if ((prio & 0xF0U) == 0U) {
return (-1);
}
for (bits = 0; bits < 4; bits++) {
if ((prio & 0x01) != 0) {
break;
}
prio >>= 1;
}
// Adjust configured priority to the number of implemented priority bits
prio = (GTIM_IRQ_PRIORITY << bits) & 0xFFUL;
// Set Private Timer interrupt priority
IRQ_SetPriority(GTIM_IRQ_NUM, prio-1U);
// Set edge-triggered IRQ
IRQ_SetMode(GTIM_IRQ_NUM, IRQ_MODE_TRIG_EDGE);
// Register tick interrupt handler function
IRQ_SetHandler(GTIM_IRQ_NUM, handler);
// Enable corresponding interrupt
IRQ_Enable(GTIM_IRQ_NUM);
// Enable system counter and timer control
#ifdef SCTR_BASE
*(uint32_t*)SCTR_BASE |= 3U;
#endif
// Enable timer control
PL1_SetControl(1U);
return (0);
}
/// Enable OS Tick.
void OS_Tick_Enable (void) {
uint32_t ctrl;
// Set pending interrupt if flag set
if (GTIM_PendIRQ != 0U) {
GTIM_PendIRQ = 0U;
IRQ_SetPending (GTIM_IRQ_NUM);
}
// Start the Private Timer
ctrl = PL1_GetControl();
// Set bit: Timer enable
ctrl |= 1U;
PL1_SetControl(ctrl);
}
/// Disable OS Tick.
void OS_Tick_Disable (void) {
uint32_t ctrl;
// Stop the Private Timer
ctrl = PL1_GetControl();
// Clear bit: Timer enable
ctrl &= ~1U;
PL1_SetControl(ctrl);
// Remember pending interrupt flag
if (IRQ_GetPending(GTIM_IRQ_NUM) != 0) {
IRQ_ClearPending(GTIM_IRQ_NUM);
GTIM_PendIRQ = 1U;
}
}
// Acknowledge OS Tick IRQ.
void OS_Tick_AcknowledgeIRQ (void) {
IRQ_ClearPending (GTIM_IRQ_NUM);
PL1_SetLoadValue(GTIM_Load);
}
// Get OS Tick IRQ number.
int32_t OS_Tick_GetIRQn (void) {
return (GTIM_IRQ_NUM);
}
// Get OS Tick clock.
uint32_t OS_Tick_GetClock (void) {
return (GTIM_Clock);
}
// Get OS Tick interval.
uint32_t OS_Tick_GetInterval (void) {
return (GTIM_Load + 1U);
}
// Get OS Tick count value.
uint32_t OS_Tick_GetCount (void) {
return (GTIM_Load - PL1_GetCurrentValue());
}
// Get OS Tick overflow status.
uint32_t OS_Tick_GetOverflow (void) {
CNTP_CTL_Type cntp_ctl;
cntp_ctl.w = PL1_GetControl();
return (cntp_ctl.b.ISTATUS);
}
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