135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/*
|
|
* Copyright (c) 2014 Travis Geiselbrecht
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files
|
|
* (the "Software"), to deal in the Software without restriction,
|
|
* including without limitation the rights to use, copy, modify, merge,
|
|
* publish, distribute, sublicense, and/or sell copies of the Software,
|
|
* and to permit persons to whom the Software is furnished to do so,
|
|
* subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
#include <debug.h>
|
|
#include <sys/types.h>
|
|
#include <err.h>
|
|
#include <stdio.h>
|
|
#include <assert.h>
|
|
#include <trace.h>
|
|
#include <kernel/thread.h>
|
|
#include <platform.h>
|
|
#include <platform/interrupts.h>
|
|
#include <platform/timer.h>
|
|
#include <platform/zynq.h>
|
|
#include "platform_p.h"
|
|
|
|
/* unused, arm_cortex_a9_timer does timer duty */
|
|
|
|
#if 0
|
|
/* driver for Cadence triple timer counter (TTC) */
|
|
|
|
#define LOCAL_TRACE 0
|
|
|
|
#define TIMREG(reg) (*REG32(TTC0_BASE + (reg)))
|
|
#define TIMREG16(reg) (*REG16(TTC0_BASE + (reg)))
|
|
#define TIMREG8(reg) (*REG8(TTC0_BASE + (reg)))
|
|
|
|
#define CLK_CTRL(n) (0x00 + (n) * 4)
|
|
#define CNT_CTRL(n) (0x0c + (n) * 4)
|
|
#define CNT_VAL(n) (0x18 + (n) * 4)
|
|
#define INTERVAL_VAL(n) (0x24 + (n) * 4)
|
|
#define MATCH_1(n) (0x30 + (n) * 4)
|
|
#define MATCH_2(n) (0x3c + (n) * 4)
|
|
#define MATCH_3(n) (0x48 + (n) * 4)
|
|
#define ISR(n) (0x54 + (n) * 4)
|
|
#define IEN(n) (0x60 + (n) * 4)
|
|
#define EVT_CTRL(n) (0x6c + (n) * 4)
|
|
#define EVT(n) (0x78 + (n) * 4)
|
|
|
|
static platform_timer_callback t_callback;
|
|
|
|
static volatile uint ticks = 0;
|
|
static lk_time_t periodic_interval;
|
|
|
|
status_t platform_set_periodic_timer(platform_timer_callback callback, void *arg, lk_time_t interval)
|
|
{
|
|
enter_critical_section();
|
|
|
|
LTRACEF("callback %p, arg %p, interval %lu\n", callback, arg, interval);
|
|
|
|
t_callback = callback;
|
|
|
|
periodic_interval = interval;
|
|
|
|
uint32_t ticks = periodic_interval * 1000; /* timer is running close to 1Mhz */
|
|
ASSERT(ticks <= 0xffff);
|
|
|
|
TIMREG(IEN(0)) = (1<<0); // interval interrupt
|
|
TIMREG(INTERVAL_VAL(0)) = ticks;
|
|
TIMREG(CNT_CTRL(0)) = (1<<5) | (1<<4) | (1<<1); // no wave, reset, interval mode
|
|
|
|
unmask_interrupt(TTC0_A_INT);
|
|
|
|
exit_critical_section();
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
lk_bigtime_t current_time_hires(void)
|
|
{
|
|
lk_bigtime_t time;
|
|
|
|
time = ticks * periodic_interval * 1000ULL;
|
|
|
|
return time;
|
|
}
|
|
|
|
lk_time_t current_time(void)
|
|
{
|
|
lk_time_t time;
|
|
|
|
time = ticks * periodic_interval;
|
|
|
|
return time;
|
|
}
|
|
|
|
static enum handler_return platform_tick(void *arg)
|
|
{
|
|
ticks++;
|
|
|
|
volatile uint32_t hole = TIMREG(ISR(0)); // ack the irq
|
|
|
|
if (t_callback) {
|
|
return t_callback(arg, current_time());
|
|
} else {
|
|
return INT_NO_RESCHEDULE;
|
|
}
|
|
}
|
|
|
|
void platform_init_timer(void)
|
|
{
|
|
/* disable timers */
|
|
TIMREG(CNT_CTRL(0)) = 0x1;
|
|
TIMREG(CNT_CTRL(1)) = 0x1;
|
|
TIMREG(CNT_CTRL(2)) = 0x1;
|
|
|
|
TIMREG(CLK_CTRL(0)) = (6 << 1) | 1; // prescale 133Mhz/(2^7) == 1039062Hz (close to 1Mhz)
|
|
|
|
register_int_handler(TTC0_A_INT, &platform_tick, NULL);
|
|
register_int_handler(TTC0_B_INT, &platform_tick, NULL);
|
|
register_int_handler(TTC0_C_INT, &platform_tick, NULL);
|
|
}
|
|
#endif
|
|
|
|
/* vim: set ts=4 sw=4 expandtab: */
|