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.
55 ******************************************************************************/
56 /***************************** Include Files *********************************/
60 #include "xparameters.h"
62 /* Global Timer is always clocked at half of the CPU frequency */
63 #define COUNTS_PER_USECOND (COUNTS_PER_SECOND / 1000000 )
65 static void sleep_common(u32 n, u32 count)
68 /* Start global timer counter, it will only be enabled if it is disabled */
71 tCur = mfcp(CNTPCT_EL0);
72 tEnd = tCur + (((XTime) n) * count);
74 tCur = mfcp(CNTPCT_EL0);
75 } while (tCur < tEnd);
78 /*****************************************************************************/
81 * This API gives a delay in microseconds
83 * @param useconds requested
85 * @return 0 if the delay can be achieved, -1 if the requested delay
90 ****************************************************************************/
91 int usleep(unsigned long useconds)
93 sleep_common((u32)useconds, COUNTS_PER_USECOND);
98 /*****************************************************************************/
101 * This API is used to provide delays in seconds
103 * @param seconds requested
109 ****************************************************************************/
110 unsigned sleep(unsigned int seconds)
112 sleep_common(seconds, COUNTS_PER_SECOND);