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>
This commit is contained in:
Lin Huang 2016-11-30 16:57:08 +08:00 committed by Xing Zheng
parent 09f41f8ed6
commit 95c3f422d8
3 changed files with 106 additions and 1 deletions

View File

@ -53,7 +53,8 @@ INCLUDES += -Iinclude/ \
C_SOURCES := src/startup.c \
src/main.c \
src/suspend.c \
src/dram.c
src/dram.c \
src/stopwatch.c
# Flags definition
CFLAGS := -g

View File

@ -44,6 +44,9 @@ typedef unsigned int uint32_t;
#define mmio_clrsetbits_32(addr, clear, set) \
mmio_write_32(addr, (mmio_read_32(addr) & ~(clear)) | (set))
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MCU_BASE 0x40000000
#define PMU_BASE (MCU_BASE + 0x07310000)
#define CRU_BASE_ADDR 0x47760000
@ -55,5 +58,8 @@ typedef unsigned int uint32_t;
void handle_suspend(void);
void handle_dram(void);
void stopwatch_init_usecs_expire(unsigned int usecs);
int stopwatch_expired(void);
void stopwatch_reset(void);
#endif /* __RK3399_MCU_H__ */

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@ -0,0 +1,98 @@
/*
* Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <m0_param.h>
#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;
}