diff options
Diffstat (limited to 'qemu/hw/openrisc/cputimer.c')
-rw-r--r-- | qemu/hw/openrisc/cputimer.c | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/qemu/hw/openrisc/cputimer.c b/qemu/hw/openrisc/cputimer.c deleted file mode 100644 index a98c799de..000000000 --- a/qemu/hw/openrisc/cputimer.c +++ /dev/null @@ -1,112 +0,0 @@ -/* - * 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 "qemu/osdep.h" -#include "cpu.h" -#include "hw/hw.h" -#include "qemu/timer.h" - -#define TIMER_PERIOD 50 /* 50 ns period for 20 MHz timer */ - -/* The time when TTCR changes */ -static uint64_t last_clk; -static int is_counting; - -void cpu_openrisc_count_update(OpenRISCCPU *cpu) -{ - uint64_t now; - - if (!is_counting) { - return; - } - now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); - cpu->env.ttcr += (uint32_t)((now - last_clk) / TIMER_PERIOD); - last_clk = now; -} - -void cpu_openrisc_timer_update(OpenRISCCPU *cpu) -{ - uint32_t wait; - uint64_t now, next; - - if (!is_counting) { - return; - } - - cpu_openrisc_count_update(cpu); - now = last_clk; - - 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 + (uint64_t)wait * TIMER_PERIOD; - timer_mod(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) -{ - timer_del(cpu->env.timer); - cpu_openrisc_count_update(cpu); - is_counting = 0; -} - -static void openrisc_timer_cb(void *opaque) -{ - OpenRISCCPU *cpu = opaque; - - if ((cpu->env.ttmr & TTMR_IE) && - timer_expired(cpu->env.timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL))) { - 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; - break; - case TIMER_SHOT: - cpu_openrisc_count_stop(cpu); - break; - case TIMER_CONT: - break; - } - - cpu_openrisc_timer_update(cpu); -} - -void cpu_openrisc_clock_init(OpenRISCCPU *cpu) -{ - cpu->env.timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, &openrisc_timer_cb, cpu); - cpu->env.ttmr = 0x00000000; - cpu->env.ttcr = 0x00000000; -} |