From 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 11:13:47 +0200 Subject: Adding upstream version 2.8.0+dfsg. Signed-off-by: Daniel Baumann --- plat/rockchip/rk3399/drivers/m0/src/stopwatch.c | 74 +++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 plat/rockchip/rk3399/drivers/m0/src/stopwatch.c (limited to 'plat/rockchip/rk3399/drivers/m0/src/stopwatch.c') diff --git a/plat/rockchip/rk3399/drivers/m0/src/stopwatch.c b/plat/rockchip/rk3399/drivers/m0/src/stopwatch.c new file mode 100644 index 0000000..5af8caa --- /dev/null +++ b/plat/rockchip/rk3399/drivers/m0/src/stopwatch.c @@ -0,0 +1,74 @@ +/* + * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include +#include "rk3399_mcu.h" + +/* use 24MHz SysTick */ +#define US_TO_CYCLE(US) (US * 24) + +#define SYST_CST 0xe000e010 +/* enable counter */ +#define ENABLE (1 << 0) +/* count down to 0 does not cause SysTick exception to pend */ +#define TICKINT (1 << 1) +/* core clock used for SysTick */ +#define CLKSOURCE (1 << 2) + +#define COUNTFLAG (1 << 16) +#define SYST_RVR 0xe000e014 +#define MAX_VALUE 0xffffff +#define MAX_USECS (MAX_VALUE / US_TO_CYCLE(1)) +#define SYST_CVR 0xe000e018 +#define SYST_CALIB 0xe000e01c + +unsigned int remaining_usecs; + +static inline void stopwatch_set_usecs(void) +{ + unsigned int cycle; + unsigned int usecs = MIN(MAX_USECS, remaining_usecs); + + remaining_usecs -= usecs; + cycle = US_TO_CYCLE(usecs); + mmio_write_32(SYST_RVR, cycle); + mmio_write_32(SYST_CVR, 0); + + mmio_write_32(SYST_CST, ENABLE | TICKINT | CLKSOURCE); +} + +void stopwatch_init_usecs_expire(unsigned int usecs) +{ + /* + * Enter an inifite loop if the stopwatch is in use. This will allow the + * state to be analyzed with a debugger. + */ + if (mmio_read_32(SYST_CST) & ENABLE) + while (1) + ; + + remaining_usecs = usecs; + stopwatch_set_usecs(); +} + +int stopwatch_expired(void) +{ + int val = mmio_read_32(SYST_CST); + if ((val & COUNTFLAG) || !(val & ENABLE)) { + if (!remaining_usecs) + return 1; + + stopwatch_set_usecs(); + } + + return 0; +} + +void stopwatch_reset(void) +{ + mmio_clrbits_32(SYST_CST, ENABLE); + remaining_usecs = 0; +} -- cgit v1.2.3