diff options
Diffstat (limited to 'src/hw/timer/arm_mptimer.c')
| -rw-r--r-- | src/hw/timer/arm_mptimer.c | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/src/hw/timer/arm_mptimer.c b/src/hw/timer/arm_mptimer.c new file mode 100644 index 0000000..3e59c2a --- /dev/null +++ b/src/hw/timer/arm_mptimer.c @@ -0,0 +1,300 @@ +/* + * Private peripheral timer/watchdog blocks for ARM 11MPCore and A9MP + * + * Copyright (c) 2006-2007 CodeSourcery. + * Copyright (c) 2011 Linaro Limited + * Written by Paul Brook, Peter Maydell + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "hw/timer/arm_mptimer.h" +#include "qemu/timer.h" +#include "qom/cpu.h" + +/* This device implements the per-cpu private timer and watchdog block + * which is used in both the ARM11MPCore and Cortex-A9MP. + */ + +static inline int get_current_cpu(ARMMPTimerState *s) +{ + if (current_cpu->cpu_index >= s->num_cpu) { + hw_error("arm_mptimer: num-cpu %d but this cpu is %d!\n", + s->num_cpu, current_cpu->cpu_index); + } + return current_cpu->cpu_index; +} + +static inline void timerblock_update_irq(TimerBlock *tb) +{ + qemu_set_irq(tb->irq, tb->status && (tb->control & 4)); +} + +/* Return conversion factor from mpcore timer ticks to qemu timer ticks. */ +static inline uint32_t timerblock_scale(TimerBlock *tb) +{ + return (((tb->control >> 8) & 0xff) + 1) * 10; +} + +static void timerblock_reload(TimerBlock *tb, int restart) +{ + if (tb->count == 0) { + return; + } + if (restart) { + tb->tick = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + } + tb->tick += (int64_t)tb->count * timerblock_scale(tb); + timer_mod(tb->timer, tb->tick); +} + +static void timerblock_tick(void *opaque) +{ + TimerBlock *tb = (TimerBlock *)opaque; + tb->status = 1; + if (tb->control & 2) { + tb->count = tb->load; + timerblock_reload(tb, 0); + } else { + tb->count = 0; + } + timerblock_update_irq(tb); +} + +static uint64_t timerblock_read(void *opaque, hwaddr addr, + unsigned size) +{ + TimerBlock *tb = (TimerBlock *)opaque; + int64_t val; + switch (addr) { + case 0: /* Load */ + return tb->load; + case 4: /* Counter. */ + if (((tb->control & 1) == 0) || (tb->count == 0)) { + return 0; + } + /* Slow and ugly, but hopefully won't happen too often. */ + val = tb->tick - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + val /= timerblock_scale(tb); + if (val < 0) { + val = 0; + } + return val; + case 8: /* Control. */ + return tb->control; + case 12: /* Interrupt status. */ + return tb->status; + default: + return 0; + } +} + +static void timerblock_write(void *opaque, hwaddr addr, + uint64_t value, unsigned size) +{ + TimerBlock *tb = (TimerBlock *)opaque; + int64_t old; + switch (addr) { + case 0: /* Load */ + tb->load = value; + /* Fall through. */ + case 4: /* Counter. */ + if ((tb->control & 1) && tb->count) { + /* Cancel the previous timer. */ + timer_del(tb->timer); + } + tb->count = value; + if (tb->control & 1) { + timerblock_reload(tb, 1); + } + break; + case 8: /* Control. */ + old = tb->control; + tb->control = value; + if (value & 1) { + if ((old & 1) && (tb->count != 0)) { + /* Do nothing if timer is ticking right now. */ + break; + } + if (tb->control & 2) { + tb->count = tb->load; + } + timerblock_reload(tb, 1); + } else if (old & 1) { + /* Shutdown the timer. */ + timer_del(tb->timer); + } + break; + case 12: /* Interrupt status. */ + tb->status &= ~value; + timerblock_update_irq(tb); + break; + } +} + +/* Wrapper functions to implement the "read timer/watchdog for + * the current CPU" memory regions. + */ +static uint64_t arm_thistimer_read(void *opaque, hwaddr addr, + unsigned size) +{ + ARMMPTimerState *s = (ARMMPTimerState *)opaque; + int id = get_current_cpu(s); + return timerblock_read(&s->timerblock[id], addr, size); +} + +static void arm_thistimer_write(void *opaque, hwaddr addr, + uint64_t value, unsigned size) +{ + ARMMPTimerState *s = (ARMMPTimerState *)opaque; + int id = get_current_cpu(s); + timerblock_write(&s->timerblock[id], addr, value, size); +} + +static const MemoryRegionOps arm_thistimer_ops = { + .read = arm_thistimer_read, + .write = arm_thistimer_write, + .valid = { + .min_access_size = 4, + .max_access_size = 4, + }, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +static const MemoryRegionOps timerblock_ops = { + .read = timerblock_read, + .write = timerblock_write, + .valid = { + .min_access_size = 4, + .max_access_size = 4, + }, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +static void timerblock_reset(TimerBlock *tb) +{ + tb->count = 0; + tb->load = 0; + tb->control = 0; + tb->status = 0; + tb->tick = 0; + if (tb->timer) { + timer_del(tb->timer); + } +} + +static void arm_mptimer_reset(DeviceState *dev) +{ + ARMMPTimerState *s = ARM_MPTIMER(dev); + int i; + + for (i = 0; i < ARRAY_SIZE(s->timerblock); i++) { + timerblock_reset(&s->timerblock[i]); + } +} + +static void arm_mptimer_init(Object *obj) +{ + ARMMPTimerState *s = ARM_MPTIMER(obj); + + memory_region_init_io(&s->iomem, obj, &arm_thistimer_ops, s, + "arm_mptimer_timer", 0x20); + sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->iomem); +} + +static void arm_mptimer_realize(DeviceState *dev, Error **errp) +{ + SysBusDevice *sbd = SYS_BUS_DEVICE(dev); + ARMMPTimerState *s = ARM_MPTIMER(dev); + int i; + + if (s->num_cpu < 1 || s->num_cpu > ARM_MPTIMER_MAX_CPUS) { + hw_error("%s: num-cpu must be between 1 and %d\n", + __func__, ARM_MPTIMER_MAX_CPUS); + } + /* We implement one timer block per CPU, and expose multiple MMIO regions: + * * region 0 is "timer for this core" + * * region 1 is "timer for core 0" + * * region 2 is "timer for core 1" + * and so on. + * The outgoing interrupt lines are + * * timer for core 0 + * * timer for core 1 + * and so on. + */ + for (i = 0; i < s->num_cpu; i++) { + TimerBlock *tb = &s->timerblock[i]; + tb->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, timerblock_tick, tb); + sysbus_init_irq(sbd, &tb->irq); + memory_region_init_io(&tb->iomem, OBJECT(s), &timerblock_ops, tb, + "arm_mptimer_timerblock", 0x20); + sysbus_init_mmio(sbd, &tb->iomem); + } +} + +static const VMStateDescription vmstate_timerblock = { + .name = "arm_mptimer_timerblock", + .version_id = 2, + .minimum_version_id = 2, + .fields = (VMStateField[]) { + VMSTATE_UINT32(count, TimerBlock), + VMSTATE_UINT32(load, TimerBlock), + VMSTATE_UINT32(control, TimerBlock), + VMSTATE_UINT32(status, TimerBlock), + VMSTATE_INT64(tick, TimerBlock), + VMSTATE_TIMER_PTR(timer, TimerBlock), + VMSTATE_END_OF_LIST() + } +}; + +static const VMStateDescription vmstate_arm_mptimer = { + .name = "arm_mptimer", + .version_id = 2, + .minimum_version_id = 2, + .fields = (VMStateField[]) { + VMSTATE_STRUCT_VARRAY_UINT32(timerblock, ARMMPTimerState, num_cpu, + 2, vmstate_timerblock, TimerBlock), + VMSTATE_END_OF_LIST() + } +}; + +static Property arm_mptimer_properties[] = { + DEFINE_PROP_UINT32("num-cpu", ARMMPTimerState, num_cpu, 0), + DEFINE_PROP_END_OF_LIST() +}; + +static void arm_mptimer_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->realize = arm_mptimer_realize; + dc->vmsd = &vmstate_arm_mptimer; + dc->reset = arm_mptimer_reset; + dc->props = arm_mptimer_properties; +} + +static const TypeInfo arm_mptimer_info = { + .name = TYPE_ARM_MPTIMER, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(ARMMPTimerState), + .instance_init = arm_mptimer_init, + .class_init = arm_mptimer_class_init, +}; + +static void arm_mptimer_register_types(void) +{ + type_register_static(&arm_mptimer_info); +} + +type_init(arm_mptimer_register_types) |
