From 2b5526aa5eed47703e8cd525e7348207bf24e2fb Mon Sep 17 00:00:00 2001 From: Kinsey Moore Date: Tue, 19 Sep 2023 14:23:06 -0500 Subject: bsps/xnandpsu: Don't rely on usleep for polling When polling hardware registers in high performance situations, don't rely on usleep or other standard sleep functions since they will necessarily rely on kernel ticks to be woken up. This can easily cause an immense reduction in throughput. --- bsps/shared/dev/nand/xnandpsu.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'bsps/shared') diff --git a/bsps/shared/dev/nand/xnandpsu.c b/bsps/shared/dev/nand/xnandpsu.c index 85e6ba8532..9e9f8959cf 100644 --- a/bsps/shared/dev/nand/xnandpsu.c +++ b/bsps/shared/dev/nand/xnandpsu.c @@ -814,6 +814,21 @@ void XNandPsu_DisableEccMode(XNandPsu *InstancePtr) InstancePtr->EccMode = XNANDPSU_NONE; } +#ifdef __rtems__ +#include +static void udelay( void ) +{ + uint64_t time = rtems_clock_get_uptime_nanoseconds() + 1000; + while (1) { + uint64_t newtime = rtems_clock_get_uptime_nanoseconds(); + if (newtime > time) { + break; + } + } +} +#define usleep(x) udelay() +#endif + /*****************************************************************************/ /** * -- cgit v1.2.3