rockchip: rk3399: add stopwatch functions to m0
There is system timer in m0, we can use it to implement a set of stopwatch functions for measuring timeouts. Signed-off-by: Lin Huang <hl@rock-chips.com> Signed-off-by: Derek Basehore <dbasehore@chromium.org>
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@ -53,7 +53,8 @@ INCLUDES += -Iinclude/ \
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C_SOURCES := src/startup.c \
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src/main.c \
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src/suspend.c \
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src/dram.c
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src/dram.c \
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src/stopwatch.c
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# Flags definition
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CFLAGS := -g
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@ -44,6 +44,9 @@ typedef unsigned int uint32_t;
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#define mmio_clrsetbits_32(addr, clear, set) \
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mmio_write_32(addr, (mmio_read_32(addr) & ~(clear)) | (set))
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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#define MAX(a, b) ((a) > (b) ? (a) : (b))
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#define MCU_BASE 0x40000000
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#define PMU_BASE (MCU_BASE + 0x07310000)
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#define CRU_BASE_ADDR 0x47760000
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@ -55,5 +58,8 @@ typedef unsigned int uint32_t;
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void handle_suspend(void);
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void handle_dram(void);
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void stopwatch_init_usecs_expire(unsigned int usecs);
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int stopwatch_expired(void);
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void stopwatch_reset(void);
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#endif /* __RK3399_MCU_H__ */
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@ -0,0 +1,98 @@
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/*
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* Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <m0_param.h>
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#include "rk3399_mcu.h"
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/* use 24MHz SysTick */
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#define US_TO_CYCLE(US) (US * 24)
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#define SYST_CST 0xe000e010
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/* enable counter */
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#define ENABLE (1 << 0)
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/* count down to 0 does not cause SysTick exception to pend */
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#define TICKINT (1 << 1)
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/* core clock used for SysTick */
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#define CLKSOURCE (1 << 2)
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#define COUNTFLAG (1 << 16)
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#define SYST_RVR 0xe000e014
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#define MAX_VALUE 0xffffff
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#define MAX_USECS (MAX_VALUE / US_TO_CYCLE(1))
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#define SYST_CVR 0xe000e018
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#define SYST_CALIB 0xe000e01c
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unsigned int remaining_usecs;
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static inline void stopwatch_set_usecs(void)
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{
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unsigned int cycle;
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unsigned int usecs = MIN(MAX_USECS, remaining_usecs);
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remaining_usecs -= usecs;
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cycle = US_TO_CYCLE(usecs);
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mmio_write_32(SYST_RVR, cycle);
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mmio_write_32(SYST_CVR, 0);
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mmio_write_32(SYST_CST, ENABLE | TICKINT | CLKSOURCE);
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}
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void stopwatch_init_usecs_expire(unsigned int usecs)
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{
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/*
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* Enter an inifite loop if the stopwatch is in use. This will allow the
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* state to be analyzed with a debugger.
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*/
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if (mmio_read_32(SYST_CST) & ENABLE)
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while (1)
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;
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remaining_usecs = usecs;
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stopwatch_set_usecs();
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}
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int stopwatch_expired(void)
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{
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int val = mmio_read_32(SYST_CST);
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if ((val & COUNTFLAG) || !(val & ENABLE)) {
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if (!remaining_usecs)
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return 1;
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stopwatch_set_usecs();
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}
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return 0;
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}
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void stopwatch_reset(void)
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{
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mmio_clrbits_32(SYST_CST, ENABLE);
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remaining_usecs = 0;
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}
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