diff options
Diffstat (limited to 'hw/timer/mips_gictimer.c')
| -rw-r--r-- | hw/timer/mips_gictimer.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/hw/timer/mips_gictimer.c b/hw/timer/mips_gictimer.c new file mode 100644 index 0000000000..3698889475 --- /dev/null +++ b/hw/timer/mips_gictimer.c @@ -0,0 +1,142 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2016 Imagination Technologies + */ + +#include "qemu/osdep.h" +#include "hw/hw.h" +#include "hw/sysbus.h" +#include "qemu/timer.h" +#include "hw/timer/mips_gictimer.h" + +#define TIMER_PERIOD 10 /* 10 ns period for 100 Mhz frequency */ + +static void gic_vptimer_update(MIPSGICTimerState *gictimer, + uint32_t vp_index, uint64_t now) +{ + uint64_t next; + uint32_t wait; + + wait = gictimer->vptimers[vp_index].comparelo - gictimer->sh_counterlo - + (uint32_t)(now / TIMER_PERIOD); + next = now + (uint64_t)wait * TIMER_PERIOD; + + timer_mod(gictimer->vptimers[vp_index].qtimer, next); +} + +static void gic_vptimer_expire(MIPSGICTimerState *gictimer, uint32_t vp_index, + uint64_t now) +{ + if (gictimer->countstop) { + /* timer stopped */ + return; + } + gictimer->cb(gictimer->opaque, vp_index); + gic_vptimer_update(gictimer, vp_index, now); +} + +static void gic_vptimer_cb(void *opaque) +{ + MIPSGICTimerVPState *vptimer = opaque; + MIPSGICTimerState *gictimer = vptimer->gictimer; + gic_vptimer_expire(gictimer, vptimer->vp_index, + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); +} + +uint32_t mips_gictimer_get_sh_count(MIPSGICTimerState *gictimer) +{ + int i; + if (gictimer->countstop) { + return gictimer->sh_counterlo; + } else { + uint64_t now; + now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + for (i = 0; i < gictimer->num_vps; i++) { + if (timer_pending(gictimer->vptimers[i].qtimer) + && timer_expired(gictimer->vptimers[i].qtimer, now)) { + /* The timer has already expired. */ + gic_vptimer_expire(gictimer, i, now); + } + } + return gictimer->sh_counterlo + (uint32_t)(now / TIMER_PERIOD); + } +} + +void mips_gictimer_store_sh_count(MIPSGICTimerState *gictimer, uint64_t count) +{ + int i; + uint64_t now; + + if (gictimer->countstop || !gictimer->vptimers[0].qtimer) { + gictimer->sh_counterlo = count; + } else { + /* Store new count register */ + now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + gictimer->sh_counterlo = count - (uint32_t)(now / TIMER_PERIOD); + /* Update timer timer */ + for (i = 0; i < gictimer->num_vps; i++) { + gic_vptimer_update(gictimer, i, now); + } + } +} + +uint32_t mips_gictimer_get_vp_compare(MIPSGICTimerState *gictimer, + uint32_t vp_index) +{ + return gictimer->vptimers[vp_index].comparelo; +} + +void mips_gictimer_store_vp_compare(MIPSGICTimerState *gictimer, + uint32_t vp_index, uint64_t compare) +{ + gictimer->vptimers[vp_index].comparelo = (uint32_t) compare; + gic_vptimer_update(gictimer, vp_index, + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); +} + +uint8_t mips_gictimer_get_countstop(MIPSGICTimerState *gictimer) +{ + return gictimer->countstop; +} + +void mips_gictimer_start_count(MIPSGICTimerState *gictimer) +{ + gictimer->countstop = 0; + mips_gictimer_store_sh_count(gictimer, gictimer->sh_counterlo); +} + +void mips_gictimer_stop_count(MIPSGICTimerState *gictimer) +{ + int i; + + gictimer->countstop = 1; + /* Store the current value */ + gictimer->sh_counterlo += + (uint32_t)(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) / TIMER_PERIOD); + for (i = 0; i < gictimer->num_vps; i++) { + timer_del(gictimer->vptimers[i].qtimer); + } +} + +MIPSGICTimerState *mips_gictimer_init(void *opaque, uint32_t nvps, + MIPSGICTimerCB *cb) +{ + int i; + MIPSGICTimerState *gictimer = g_new(MIPSGICTimerState, 1); + gictimer->vptimers = g_new(MIPSGICTimerVPState, nvps); + gictimer->countstop = 1; + gictimer->num_vps = nvps; + gictimer->opaque = opaque; + gictimer->cb = cb; + for (i = 0; i < nvps; i++) { + gictimer->vptimers[i].gictimer = gictimer; + gictimer->vptimers[i].vp_index = i; + gictimer->vptimers[i].qtimer = timer_new_ns(QEMU_CLOCK_VIRTUAL, + &gic_vptimer_cb, + &gictimer->vptimers[i]); + } + return gictimer; +} |