e93379b039
Rename four functions in preparation for new API. Rename qemu_timer_expired to timer_expired Rename qemu_timer_expire_time_ns to timer_expire_time_ns Rename qemu_timer_pending to timer_pending Rename qemu_timer_expired_ns to timer_expired_ns Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
|
|
* QEMU OpenRISC timer support
|
|
*
|
|
* Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
|
|
* Zhizhou Zhang <etouzh@gmail.com>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "cpu.h"
|
|
#include "hw/hw.h"
|
|
#include "qemu/timer.h"
|
|
|
|
#define TIMER_FREQ (20 * 1000 * 1000) /* 20MHz */
|
|
|
|
/* The time when TTCR changes */
|
|
static uint64_t last_clk;
|
|
static int is_counting;
|
|
|
|
void cpu_openrisc_count_update(OpenRISCCPU *cpu)
|
|
{
|
|
uint64_t now, next;
|
|
uint32_t wait;
|
|
|
|
now = qemu_get_clock_ns(vm_clock);
|
|
if (!is_counting) {
|
|
qemu_del_timer(cpu->env.timer);
|
|
last_clk = now;
|
|
return;
|
|
}
|
|
|
|
cpu->env.ttcr += (uint32_t)muldiv64(now - last_clk, TIMER_FREQ,
|
|
get_ticks_per_sec());
|
|
last_clk = now;
|
|
|
|
if ((cpu->env.ttmr & TTMR_TP) <= (cpu->env.ttcr & TTMR_TP)) {
|
|
wait = TTMR_TP - (cpu->env.ttcr & TTMR_TP) + 1;
|
|
wait += cpu->env.ttmr & TTMR_TP;
|
|
} else {
|
|
wait = (cpu->env.ttmr & TTMR_TP) - (cpu->env.ttcr & TTMR_TP);
|
|
}
|
|
|
|
next = now + muldiv64(wait, get_ticks_per_sec(), TIMER_FREQ);
|
|
qemu_mod_timer(cpu->env.timer, next);
|
|
}
|
|
|
|
void cpu_openrisc_count_start(OpenRISCCPU *cpu)
|
|
{
|
|
is_counting = 1;
|
|
cpu_openrisc_count_update(cpu);
|
|
}
|
|
|
|
void cpu_openrisc_count_stop(OpenRISCCPU *cpu)
|
|
{
|
|
is_counting = 0;
|
|
cpu_openrisc_count_update(cpu);
|
|
}
|
|
|
|
static void openrisc_timer_cb(void *opaque)
|
|
{
|
|
OpenRISCCPU *cpu = opaque;
|
|
|
|
if ((cpu->env.ttmr & TTMR_IE) &&
|
|
timer_expired(cpu->env.timer, qemu_get_clock_ns(vm_clock))) {
|
|
CPUState *cs = CPU(cpu);
|
|
|
|
cpu->env.ttmr |= TTMR_IP;
|
|
cs->interrupt_request |= CPU_INTERRUPT_TIMER;
|
|
}
|
|
|
|
switch (cpu->env.ttmr & TTMR_M) {
|
|
case TIMER_NONE:
|
|
break;
|
|
case TIMER_INTR:
|
|
cpu->env.ttcr = 0;
|
|
cpu_openrisc_count_start(cpu);
|
|
break;
|
|
case TIMER_SHOT:
|
|
cpu_openrisc_count_stop(cpu);
|
|
break;
|
|
case TIMER_CONT:
|
|
cpu_openrisc_count_start(cpu);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void cpu_openrisc_clock_init(OpenRISCCPU *cpu)
|
|
{
|
|
cpu->env.timer = qemu_new_timer_ns(vm_clock, &openrisc_timer_cb, cpu);
|
|
cpu->env.ttmr = 0x00000000;
|
|
cpu->env.ttcr = 0x00000000;
|
|
}
|