1 /******************************************************************************
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31 ******************************************************************************/
32 /*****************************************************************************
36 * This function provides a second delay using the Global Timer register in
37 * the ARM Cortex A53 MP core.
40 * MODIFICATION HISTORY:
42 * Ver Who Date Changes
43 * ----- -------- -------- -----------------------------------------------
44 * 5.00 pkp 05/29/14 First release
45 * 5.04 pkp 28/01/16 Modified the sleep API to configure Time Stamp
46 * generator only when disable using frequency from
47 * xparamters.h instead of hardcoding
48 * 5.05 pkp 13/04/16 Modified sleep routine to call XTime_StartTimer
49 * which enables timer only when it is disabled and
50 * read counter value directly from register instead
51 * of calling XTime_GetTime for optimization
52 * 6.0 asa 08/15/16 Updated the sleep/usleep signature. Fix for CR#956899.
53 * 6.6 srm 10/18/17 Updated sleep routines to support user configurable
54 * implementation. Now sleep routines will use Timer
55 * specified by the user (i.e. Global timer/TTC timer)
56 * srm 01/11/18 Fixed the compilation warning.
59 ******************************************************************************/
60 /***************************** Include Files *********************************/
64 #include "xparameters.h"
66 #if defined (SLEEP_TIMER_BASEADDR)
67 #include "xil_sleeptimer.h"
69 /**************************** Constant Definitions ************************/
71 #if defined (SLEEP_TIMER_BASEADDR)
72 #define COUNTS_PER_USECOND (COUNTS_PER_SECOND / 1000000 )
74 /* Global Timer is always clocked at half of the CPU frequency */
75 #define COUNTS_PER_USECOND (COUNTS_PER_SECOND / 1000000 )
78 /************************************************************************/
79 #if !defined (SLEEP_TIMER_BASEADDR)
80 static void sleep_common(u32 n, u32 count)
83 /* Start global timer counter, it will only be enabled if it is disabled */
86 tCur = mfcp(CNTPCT_EL0);
87 tEnd = tCur + (((XTime) n) * count);
89 tCur = mfcp(CNTPCT_EL0);
90 } while (tCur < tEnd);
93 /*****************************************************************************/
96 * This API gives a delay in microseconds
98 * @param useconds requested
100 * @return 0 if the delay can be achieved, -1 if the requested delay
105 ****************************************************************************/
106 int usleep_A53(unsigned long useconds)
108 #if defined (SLEEP_TIMER_BASEADDR)
109 Xil_SleepTTCCommon(useconds, COUNTS_PER_USECOND);
111 sleep_common((u32)useconds, COUNTS_PER_USECOND);
117 /*****************************************************************************/
120 * This API is used to provide delays in seconds
122 * @param seconds requested
128 ****************************************************************************/
129 unsigned sleep_A53(unsigned int seconds)
131 #if defined (SLEEP_TIMER_BASEADDR)
132 Xil_SleepTTCCommon(seconds, COUNTS_PER_SECOND);
134 sleep_common(seconds, COUNTS_PER_SECOND);