| /* |
| * 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 "qemu/osdep.h" |
| #include "hw/hw.h" |
| #include "hw/irq.h" |
| #include "hw/ptimer.h" |
| #include "hw/qdev-properties.h" |
| #include "hw/timer/arm_mptimer.h" |
| #include "migration/vmstate.h" |
| #include "qapi/error.h" |
| #include "qemu/module.h" |
| #include "hw/core/cpu.h" |
| |
| #define PTIMER_POLICY \ |
| (PTIMER_POLICY_WRAP_AFTER_ONE_PERIOD | \ |
| PTIMER_POLICY_CONTINUOUS_TRIGGER | \ |
| PTIMER_POLICY_NO_IMMEDIATE_TRIGGER | \ |
| PTIMER_POLICY_NO_IMMEDIATE_RELOAD | \ |
| PTIMER_POLICY_NO_COUNTER_ROUND_DOWN) |
| |
| /* 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) |
| { |
| int cpu_id = current_cpu ? current_cpu->cpu_index : 0; |
| |
| if (cpu_id >= s->num_cpu) { |
| hw_error("arm_mptimer: num-cpu %d but this cpu is %d!\n", |
| s->num_cpu, cpu_id); |
| } |
| |
| return cpu_id; |
| } |
| |
| 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(uint32_t control) |
| { |
| return (((control >> 8) & 0xff) + 1) * 10; |
| } |
| |
| /* Must be called within a ptimer transaction block */ |
| static inline void timerblock_set_count(struct ptimer_state *timer, |
| uint32_t control, uint64_t *count) |
| { |
| /* PTimer would trigger interrupt for periodic timer when counter set |
| * to 0, MPtimer under certain condition only. |
| */ |
| if ((control & 3) == 3 && (control & 0xff00) == 0 && *count == 0) { |
| *count = ptimer_get_limit(timer); |
| } |
| ptimer_set_count(timer, *count); |
| } |
| |
| /* Must be called within a ptimer transaction block */ |
| static inline void timerblock_run(struct ptimer_state *timer, |
| uint32_t control, uint32_t load) |
| { |
| if ((control & 1) && ((control & 0xff00) || load != 0)) { |
| ptimer_run(timer, !(control & 2)); |
| } |
| } |
| |
| static void timerblock_tick(void *opaque) |
| { |
| TimerBlock *tb = (TimerBlock *)opaque; |
| /* Periodic timer with load = 0 and prescaler != 0 would re-trigger |
| * IRQ after one period, otherwise it either stops or wraps around. |
| */ |
| if ((tb->control & 2) && (tb->control & 0xff00) == 0 && |
| ptimer_get_limit(tb->timer) == 0) { |
| ptimer_stop(tb->timer); |
| } |
| tb->status = 1; |
| timerblock_update_irq(tb); |
| } |
| |
| static uint64_t timerblock_read(void *opaque, hwaddr addr, |
| unsigned size) |
| { |
| TimerBlock *tb = (TimerBlock *)opaque; |
| switch (addr) { |
| case 0: /* Load */ |
| return ptimer_get_limit(tb->timer); |
| case 4: /* Counter. */ |
| return ptimer_get_count(tb->timer); |
| 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; |
| uint32_t control = tb->control; |
| switch (addr) { |
| case 0: /* Load */ |
| ptimer_transaction_begin(tb->timer); |
| /* Setting load to 0 stops the timer without doing the tick if |
| * prescaler = 0. |
| */ |
| if ((control & 1) && (control & 0xff00) == 0 && value == 0) { |
| ptimer_stop(tb->timer); |
| } |
| ptimer_set_limit(tb->timer, value, 1); |
| timerblock_run(tb->timer, control, value); |
| ptimer_transaction_commit(tb->timer); |
| break; |
| case 4: /* Counter. */ |
| ptimer_transaction_begin(tb->timer); |
| /* Setting counter to 0 stops the one-shot timer, or periodic with |
| * load = 0, without doing the tick if prescaler = 0. |
| */ |
| if ((control & 1) && (control & 0xff00) == 0 && value == 0 && |
| (!(control & 2) || ptimer_get_limit(tb->timer) == 0)) { |
| ptimer_stop(tb->timer); |
| } |
| timerblock_set_count(tb->timer, control, &value); |
| timerblock_run(tb->timer, control, value); |
| ptimer_transaction_commit(tb->timer); |
| break; |
| case 8: /* Control. */ |
| ptimer_transaction_begin(tb->timer); |
| if ((control & 3) != (value & 3)) { |
| ptimer_stop(tb->timer); |
| } |
| if ((control & 0xff00) != (value & 0xff00)) { |
| ptimer_set_period(tb->timer, timerblock_scale(value)); |
| } |
| if (value & 1) { |
| uint64_t count = ptimer_get_count(tb->timer); |
| /* Re-load periodic timer counter if needed. */ |
| if ((value & 2) && count == 0) { |
| timerblock_set_count(tb->timer, value, &count); |
| } |
| timerblock_run(tb->timer, value, count); |
| } |
| tb->control = value; |
| ptimer_transaction_commit(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->control = 0; |
| tb->status = 0; |
| if (tb->timer) { |
| ptimer_transaction_begin(tb->timer); |
| ptimer_stop(tb->timer); |
| ptimer_set_limit(tb->timer, 0, 1); |
| ptimer_set_period(tb->timer, timerblock_scale(0)); |
| ptimer_transaction_commit(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) { |
| error_setg(errp, "num-cpu must be between 1 and %d", |
| ARM_MPTIMER_MAX_CPUS); |
| return; |
| } |
| /* 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 = ptimer_init(timerblock_tick, tb, PTIMER_POLICY); |
| 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 = 3, |
| .minimum_version_id = 3, |
| .fields = (const VMStateField[]) { |
| VMSTATE_UINT32(control, TimerBlock), |
| VMSTATE_UINT32(status, TimerBlock), |
| VMSTATE_PTIMER(timer, TimerBlock), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static const VMStateDescription vmstate_arm_mptimer = { |
| .name = "arm_mptimer", |
| .version_id = 3, |
| .minimum_version_id = 3, |
| .fields = (const VMStateField[]) { |
| VMSTATE_STRUCT_VARRAY_UINT32(timerblock, ARMMPTimerState, num_cpu, |
| 3, 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; |
| device_class_set_props(dc, 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) |
