136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2015 Xilinx, Inc. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* Use of the Software is limited solely to applications:
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* (a) running on a Xilinx device, or
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* (b) that interact with a Xilinx device through a bus or interconnect.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* XILINX BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Except as contained in this notice, the name of the Xilinx shall not be used
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* in advertising or otherwise to promote the sale, use or other dealings in
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* this Software without prior written authorization from Xilinx.
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*
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******************************************************************************/
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/*
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* CONTENT
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* Timer peripheral driver. Code is mostly reused from
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* hello_ttc0_interrupt application.
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*/
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#include <xil_exception.h>
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#include <xil_printf.h>
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#include <xttcps.h>
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#include "timer.h"
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#include "gic_setup.h"
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#include "pm_client.h"
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volatile u32 TickCount = 0;
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static XTtcPs timer0_inst;
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/**
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* TickHandler() - interrupt handler for timer 0
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* @timer_inst: pointer to the timer instance
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*/
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static void TickHandler(XTtcPs *timer_inst)
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{
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u32 int_status = XTtcPs_GetInterruptStatus(timer_inst);
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int_status &= XTtcPs_ReadReg(timer_inst->Config.BaseAddress, XTTCPS_IER_OFFSET);
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XTtcPs_ClearInterruptStatus(timer_inst, int_status);
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TickCount++;
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pm_dbg("Timer0 interrupt handler, tick_count = %d\n", TickCount);
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}
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/**
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* TimerSetIntervalMode() - This fuction sets TTC into interval mode
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* @timer_inst pointer to the timer instance
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* @sec interval timeout in seconds
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*/
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static void TimerSetIntervalMode(XTtcPs *TimerInstPtr, u32 PeriodInSec)
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{
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/* Stop the timer */
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XTtcPs_Stop(TimerInstPtr);
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/* Set Interval mode */
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XTtcPs_SetOptions(TimerInstPtr, XTTCPS_OPTION_INTERVAL_MODE);
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XTtcPs_SetInterval(TimerInstPtr, (PeriodInSec * COUNT_PER_SEC));
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XTtcPs_ResetCounterValue(TimerInstPtr);
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XTtcPs_SetPrescaler(TimerInstPtr, 15);
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/* Enable interrupt */
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XTtcPs_EnableInterrupts(TimerInstPtr, XTTCPS_IXR_INTERVAL_MASK);
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}
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/**
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* TimerInit() - initializes timer0 device
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* @timeout period for the interval timer interrupt generation
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*/
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s32 TimerInit(u32 PeriodInSec)
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{
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s32 status;
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XTtcPs_Config *timer_config = XTtcPs_LookupConfig(TTC0_0_DEVICE_ID);
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if (NULL == timer_config) {
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return XST_FAILURE;
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}
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status = XTtcPs_CfgInitialize(&timer0_inst, timer_config, timer_config->BaseAddress);
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if (XST_SUCCESS != status) {
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return status;
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}
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status = GicSetupInterruptSystem(TTC_INT_ID0,
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&timer0_inst, (Xil_ExceptionHandler) TickHandler);
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if (XST_SUCCESS == status) {
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TimerSetIntervalMode(&timer0_inst, PeriodInSec);
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XTtcPs_Start(&timer0_inst);
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}
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return status;
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}
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/**
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* TimerConfigure() - configure timer to generate periodic interrupts
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* timer_period Time between two timer ticks
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*
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* @return Status of configuration success
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*/
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s32 TimerConfigure(u32 Period)
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{
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s32 ret_status = TimerInit(Period);
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switch (ret_status) {
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case XST_SUCCESS:
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pm_dbg("OK, configured timer\n");
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break;
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case XST_DEVICE_IS_STARTED:
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pm_dbg("WARNING, timer is already counting\n");
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break;
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case XST_FAILURE:
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pm_dbg("ERROR, failed to configure timer\n");
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break;
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default:
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pm_dbg("??? unhandled status %d\n", ret_status);
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break;
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}
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return ret_status;
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}
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