M7350/bootable/bootloader/lk/platform/msm_shared/timer.c
2024-09-09 08:52:07 +00:00

139 lines
3.7 KiB
C

/*
* Copyright (c) 2008, Google Inc.
* All rights reserved.
*
* Copyright (c) 2009-2011, The Linux Foundation. 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 Google, Inc. 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 OWNER 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 <debug.h>
#include <reg.h>
#include <sys/types.h>
#include <platform/timer.h>
#include <platform/irqs.h>
#include <platform/iomap.h>
#include <platform/interrupts.h>
#include <kernel/thread.h>
#define GPT_ENABLE_CLR_ON_MATCH_EN 2
#define GPT_ENABLE_EN 1
#define DGT_ENABLE_CLR_ON_MATCH_EN 2
#define DGT_ENABLE_EN 1
#define SPSS_TIMER_STATUS_DGT_EN (1 << 0)
static platform_timer_callback timer_callback;
static void *timer_arg;
static time_t timer_interval;
static volatile uint32_t ticks;
static enum handler_return timer_irq(void *arg)
{
ticks += timer_interval;
return timer_callback(timer_arg, ticks);
}
status_t
platform_set_periodic_timer(platform_timer_callback callback,
void *arg, time_t interval)
{
uint32_t tick_count = interval * platform_tick_rate() / 1000;
enter_critical_section();
timer_callback = callback;
timer_arg = arg;
timer_interval = interval;
writel(tick_count, DGT_MATCH_VAL);
writel(0, DGT_CLEAR);
writel(DGT_ENABLE_EN | DGT_ENABLE_CLR_ON_MATCH_EN, DGT_ENABLE);
register_int_handler(INT_DEBUG_TIMER_EXP, timer_irq, 0);
unmask_interrupt(INT_DEBUG_TIMER_EXP);
exit_critical_section();
return 0;
}
time_t current_time(void)
{
return ticks;
}
static void wait_for_timer_op(void)
{
while (readl(SPSS_TIMER_STATUS) & SPSS_TIMER_STATUS_DGT_EN) ;
}
void platform_uninit_timer(void)
{
writel(0, DGT_ENABLE);
wait_for_timer_op();
writel(0, DGT_CLEAR);
wait_for_timer_op();
}
void mdelay(unsigned msecs)
{
msecs *= 33;
writel(0, GPT_CLEAR);
writel(0, GPT_ENABLE);
while (readl(GPT_COUNT_VAL) != 0) ;
writel(GPT_ENABLE_EN, GPT_ENABLE);
while (readl(GPT_COUNT_VAL) < msecs) ;
writel(0, GPT_ENABLE);
writel(0, GPT_CLEAR);
}
void udelay(unsigned usecs)
{
usecs = (usecs * 33 + 1000 - 33) / 1000;
writel(0, GPT_CLEAR);
writel(0, GPT_ENABLE);
while (readl(GPT_COUNT_VAL) != 0) ;
writel(GPT_ENABLE_EN, GPT_ENABLE);
while (readl(GPT_COUNT_VAL) < usecs) ;
writel(0, GPT_ENABLE);
writel(0, GPT_CLEAR);
}
/* Return current time in micro seconds */
bigtime_t current_time_hires(void)
{
return ticks * 1000ULL;
}