113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
/*
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* Copyright (c) 2014 Travis Geiselbrecht
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*
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* Use of this source code is governed by a MIT-style
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* license that can be found in the LICENSE file or at
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* https://opensource.org/licenses/MIT
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*/
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#include <lk/debug.h>
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#include <sys/types.h>
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#include <lk/err.h>
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#include <stdio.h>
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#include <assert.h>
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#include <lk/trace.h>
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#include <kernel/thread.h>
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#include <platform.h>
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#include <platform/interrupts.h>
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#include <platform/timer.h>
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#include <platform/zynq.h>
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#include "platform_p.h"
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/* unused, arm_cortex_a9_timer does timer duty */
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#if 0
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/* driver for Cadence triple timer counter (TTC) */
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#define LOCAL_TRACE 0
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#define TIMREG(reg) (*REG32(TTC0_BASE + (reg)))
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#define TIMREG16(reg) (*REG16(TTC0_BASE + (reg)))
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#define TIMREG8(reg) (*REG8(TTC0_BASE + (reg)))
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#define CLK_CTRL(n) (0x00 + (n) * 4)
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#define CNT_CTRL(n) (0x0c + (n) * 4)
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#define CNT_VAL(n) (0x18 + (n) * 4)
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#define INTERVAL_VAL(n) (0x24 + (n) * 4)
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#define MATCH_1(n) (0x30 + (n) * 4)
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#define MATCH_2(n) (0x3c + (n) * 4)
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#define MATCH_3(n) (0x48 + (n) * 4)
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#define ISR(n) (0x54 + (n) * 4)
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#define IEN(n) (0x60 + (n) * 4)
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#define EVT_CTRL(n) (0x6c + (n) * 4)
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#define EVT(n) (0x78 + (n) * 4)
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static platform_timer_callback t_callback;
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static volatile uint ticks = 0;
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static lk_time_t periodic_interval;
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status_t platform_set_periodic_timer(platform_timer_callback callback, void *arg, lk_time_t interval) {
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enter_critical_section();
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LTRACEF("callback %p, arg %p, interval %lu\n", callback, arg, interval);
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t_callback = callback;
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periodic_interval = interval;
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uint32_t ticks = periodic_interval * 1000; /* timer is running close to 1Mhz */
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ASSERT(ticks <= 0xffff);
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TIMREG(IEN(0)) = (1<<0); // interval interrupt
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TIMREG(INTERVAL_VAL(0)) = ticks;
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TIMREG(CNT_CTRL(0)) = (1<<5) | (1<<4) | (1<<1); // no wave, reset, interval mode
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unmask_interrupt(TTC0_A_INT);
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exit_critical_section();
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return NO_ERROR;
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}
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lk_bigtime_t current_time_hires(void) {
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lk_bigtime_t time;
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time = ticks * periodic_interval * 1000ULL;
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return time;
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}
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lk_time_t current_time(void) {
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lk_time_t time;
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time = ticks * periodic_interval;
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return time;
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}
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static enum handler_return platform_tick(void *arg) {
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ticks++;
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volatile uint32_t hole = TIMREG(ISR(0)); // ack the irq
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if (t_callback) {
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return t_callback(arg, current_time());
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} else {
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return INT_NO_RESCHEDULE;
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}
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}
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void platform_init_timer(void) {
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/* disable timers */
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TIMREG(CNT_CTRL(0)) = 0x1;
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TIMREG(CNT_CTRL(1)) = 0x1;
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TIMREG(CNT_CTRL(2)) = 0x1;
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TIMREG(CLK_CTRL(0)) = (6 << 1) | 1; // prescale 133Mhz/(2^7) == 1039062Hz (close to 1Mhz)
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register_int_handler(TTC0_A_INT, &platform_tick, NULL);
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register_int_handler(TTC0_B_INT, &platform_tick, NULL);
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register_int_handler(TTC0_C_INT, &platform_tick, NULL);
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}
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#endif
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