freertos: release the generic version source code

freertos runs on the second core (small one) of the CPU

freertos/cvitek/arch/arm64/src/xil_sleep.c

@@ -0,0 +1,139 @@
+/******************************************************************************
+*
+* Copyright (C) 2014 - 2017 Xilinx, Inc. All rights reserved.
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy
+* of this software and associated documentation files (the "Software"), to deal
+* in the Software without restriction, including without limitation the rights
+* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+* copies of the Software, and to permit persons to whom the Software is
+* furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in
+* all copies or substantial portions of the Software.
+*
+* Use of the Software is limited solely to applications:
+* (a) running on a Xilinx device, or
+* (b) that interact with a Xilinx device through a bus or interconnect.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+* XILINX  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+* SOFTWARE.
+*
+* Except as contained in this notice, the name of the Xilinx shall not be used
+* in advertising or otherwise to promote the sale, use or other dealings in
+* this Software without prior written authorization from Xilinx.
+*
+******************************************************************************/
+/*****************************************************************************
+*
+* @file sleep.c
+*
+* This function provides a second delay using the Global Timer register in
+* the ARM Cortex A53 MP core.
+*
+* <pre>
+* MODIFICATION HISTORY:
+*
+* Ver   Who      Date     Changes
+* ----- -------- -------- -----------------------------------------------
+* 5.00 	pkp  	 05/29/14 First release
+* 5.04	pkp		 28/01/16 Modified the sleep API to configure Time Stamp
+*						  generator only when disable using frequency from
+*						  xparamters.h instead of hardcoding
+* 5.05	pkp		 13/04/16 Modified sleep routine to call XTime_StartTimer
+*						  which enables timer only when it is disabled and
+*						  read counter value directly from register instead
+*						  of calling XTime_GetTime for optimization
+* 6.0   asa      08/15/16 Updated the sleep/usleep signature. Fix for CR#956899.
+* 6.6	srm      10/18/17 Updated sleep routines to support user configurable
+*                         implementation. Now sleep routines will use Timer
+*                         specified by the user (i.e. Global timer/TTC timer)
+*       srm      01/11/18 Fixed the compilation warning.
+* </pre>
+*
+******************************************************************************/
+/***************************** Include Files *********************************/
+
+#include "sleep.h"
+#include "xtime_l.h"
+#include "xparameters.h"
+#include "xpseudo_asm_gcc.h"
+
+#if defined(SLEEP_TIMER_BASEADDR)
+#include "xil_sleeptimer.h"
+#endif
+/****************************  Constant Definitions  ************************/
+
+#if defined(SLEEP_TIMER_BASEADDR)
+#define COUNTS_PER_USECOND (COUNTS_PER_SECOND / 1000000)
+#else
+/* Global Timer is always clocked at half of the CPU frequency */
+#define COUNTS_PER_USECOND (COUNTS_PER_SECOND / 1000000)
+#endif
+
+/************************************************************************/
+#if !defined(SLEEP_TIMER_BASEADDR)
+static void sleep_common(u32 n, u32 count)
+{
+	XTime tEnd, tCur;
+	/* Start global timer counter, it will only be enabled if it is disabled */
+	XTime_StartTimer();
+
+	tCur = mfcp(CNTPCT_EL0);
+	tEnd = tCur + (((XTime)n) * count);
+	do {
+		tCur = mfcp(CNTPCT_EL0);
+	} while (tCur < tEnd);
+}
+#endif
+/*****************************************************************************/
+/**
+*
+* This API gives a delay in microseconds
+*
+* @param	useconds requested
+*
+* @return	0 if the delay can be achieved, -1 if the requested delay
+*		is out of range
+*
+* @note		None.
+*
+****************************************************************************/
+int usleep_A53(unsigned long useconds)
+{
+#if defined(SLEEP_TIMER_BASEADDR)
+	Xil_SleepTTCCommon(useconds, COUNTS_PER_USECOND);
+#else
+	sleep_common((u32)useconds, COUNTS_PER_USECOND);
+#endif
+
+	return 0;
+}
+
+/*****************************************************************************/
+/*
+*
+* This API is used to provide delays in seconds
+*
+* @param	seconds requested
+*
+* @return	0 always
+*
+* @note		None.
+*
+****************************************************************************/
+unsigned sleep_A53(unsigned int seconds)
+{
+#if defined(SLEEP_TIMER_BASEADDR)
+	Xil_SleepTTCCommon(seconds, COUNTS_PER_SECOND);
+#else
+	sleep_common(seconds, COUNTS_PER_SECOND);
+#endif
+
+	return 0;
+}