diff options
Diffstat (limited to 'hw/intc/bcm2836_control.c')
| -rw-r--r-- | hw/intc/bcm2836_control.c | 101 |
1 files changed, 99 insertions, 2 deletions
diff --git a/hw/intc/bcm2836_control.c b/hw/intc/bcm2836_control.c index cfa5bc7365..421469f2ef 100644 --- a/hw/intc/bcm2836_control.c +++ b/hw/intc/bcm2836_control.c @@ -7,7 +7,9 @@ * This code is licensed under the GNU GPLv2 and later. * * At present, only implements interrupt routing, and mailboxes (i.e., - * not local timer, PMU interrupt, or AXI counters). + * not PMU interrupt, or AXI counters). + * + * ARM Local Timer IRQ Copyright (c) 2019. Zoltán Baldaszti * * Ref: * https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2836/QA7_rev3.4.pdf @@ -18,6 +20,9 @@ #include "qemu/log.h" #define REG_GPU_ROUTE 0x0c +#define REG_LOCALTIMERROUTING 0x24 +#define REG_LOCALTIMERCONTROL 0x34 +#define REG_LOCALTIMERACK 0x38 #define REG_TIMERCONTROL 0x40 #define REG_MBOXCONTROL 0x50 #define REG_IRQSRC 0x60 @@ -43,6 +48,13 @@ #define IRQ_TIMER 11 #define IRQ_MAX IRQ_TIMER +#define LOCALTIMER_FREQ 38400000 +#define LOCALTIMER_INTFLAG (1 << 31) +#define LOCALTIMER_RELOAD (1 << 30) +#define LOCALTIMER_INTENABLE (1 << 29) +#define LOCALTIMER_ENABLE (1 << 28) +#define LOCALTIMER_VALUE(x) ((x) & 0xfffffff) + static void deliver_local(BCM2836ControlState *s, uint8_t core, uint8_t irq, uint32_t controlreg, uint8_t controlidx) { @@ -78,6 +90,20 @@ static void bcm2836_control_update(BCM2836ControlState *s) s->fiqsrc[s->route_gpu_fiq] |= (uint32_t)1 << IRQ_GPU; } + /* + * handle the control module 'local timer' interrupt for one of the + * cores' IRQ/FIQ; this is distinct from the per-CPU timer + * interrupts handled below. + */ + if ((s->local_timer_control & LOCALTIMER_INTENABLE) && + (s->local_timer_control & LOCALTIMER_INTFLAG)) { + if (s->route_localtimer & 4) { + s->fiqsrc[(s->route_localtimer & 3)] |= (uint32_t)1 << IRQ_TIMER; + } else { + s->irqsrc[(s->route_localtimer & 3)] |= (uint32_t)1 << IRQ_TIMER; + } + } + for (i = 0; i < BCM2836_NCORES; i++) { /* handle local timer interrupts for this core */ if (s->timerirqs[i]) { @@ -162,6 +188,54 @@ static void bcm2836_control_set_gpu_fiq(void *opaque, int irq, int level) bcm2836_control_update(s); } +static void bcm2836_control_local_timer_set_next(void *opaque) +{ + BCM2836ControlState *s = opaque; + uint64_t next_event; + + assert(LOCALTIMER_VALUE(s->local_timer_control) > 0); + + next_event = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + + muldiv64(LOCALTIMER_VALUE(s->local_timer_control), + NANOSECONDS_PER_SECOND, LOCALTIMER_FREQ); + timer_mod(&s->timer, next_event); +} + +static void bcm2836_control_local_timer_tick(void *opaque) +{ + BCM2836ControlState *s = opaque; + + bcm2836_control_local_timer_set_next(s); + + s->local_timer_control |= LOCALTIMER_INTFLAG; + bcm2836_control_update(s); +} + +static void bcm2836_control_local_timer_control(void *opaque, uint32_t val) +{ + BCM2836ControlState *s = opaque; + + s->local_timer_control = val; + if (val & LOCALTIMER_ENABLE) { + bcm2836_control_local_timer_set_next(s); + } else { + timer_del(&s->timer); + } +} + +static void bcm2836_control_local_timer_ack(void *opaque, uint32_t val) +{ + BCM2836ControlState *s = opaque; + + if (val & LOCALTIMER_INTFLAG) { + s->local_timer_control &= ~LOCALTIMER_INTFLAG; + } + if ((val & LOCALTIMER_RELOAD) && + (s->local_timer_control & LOCALTIMER_ENABLE)) { + bcm2836_control_local_timer_set_next(s); + } +} + static uint64_t bcm2836_control_read(void *opaque, hwaddr offset, unsigned size) { BCM2836ControlState *s = opaque; @@ -170,6 +244,12 @@ static uint64_t bcm2836_control_read(void *opaque, hwaddr offset, unsigned size) assert(s->route_gpu_fiq < BCM2836_NCORES && s->route_gpu_irq < BCM2836_NCORES); return ((uint32_t)s->route_gpu_fiq << 2) | s->route_gpu_irq; + } else if (offset == REG_LOCALTIMERROUTING) { + return s->route_localtimer; + } else if (offset == REG_LOCALTIMERCONTROL) { + return s->local_timer_control; + } else if (offset == REG_LOCALTIMERACK) { + return 0; } else if (offset >= REG_TIMERCONTROL && offset < REG_MBOXCONTROL) { return s->timercontrol[(offset - REG_TIMERCONTROL) >> 2]; } else if (offset >= REG_MBOXCONTROL && offset < REG_IRQSRC) { @@ -195,6 +275,12 @@ static void bcm2836_control_write(void *opaque, hwaddr offset, if (offset == REG_GPU_ROUTE) { s->route_gpu_irq = val & 0x3; s->route_gpu_fiq = (val >> 2) & 0x3; + } else if (offset == REG_LOCALTIMERROUTING) { + s->route_localtimer = val & 7; + } else if (offset == REG_LOCALTIMERCONTROL) { + bcm2836_control_local_timer_control(s, val); + } else if (offset == REG_LOCALTIMERACK) { + bcm2836_control_local_timer_ack(s, val); } else if (offset >= REG_TIMERCONTROL && offset < REG_MBOXCONTROL) { s->timercontrol[(offset - REG_TIMERCONTROL) >> 2] = val & 0xff; } else if (offset >= REG_MBOXCONTROL && offset < REG_IRQSRC) { @@ -227,6 +313,10 @@ static void bcm2836_control_reset(DeviceState *d) s->route_gpu_irq = s->route_gpu_fiq = 0; + timer_del(&s->timer); + s->route_localtimer = 0; + s->local_timer_control = 0; + for (i = 0; i < BCM2836_NCORES; i++) { s->timercontrol[i] = 0; s->mailboxcontrol[i] = 0; @@ -263,11 +353,15 @@ static void bcm2836_control_init(Object *obj) /* outputs to CPU cores */ qdev_init_gpio_out_named(dev, s->irq, "irq", BCM2836_NCORES); qdev_init_gpio_out_named(dev, s->fiq, "fiq", BCM2836_NCORES); + + /* create a qemu virtual timer */ + timer_init_ns(&s->timer, QEMU_CLOCK_VIRTUAL, + bcm2836_control_local_timer_tick, s); } static const VMStateDescription vmstate_bcm2836_control = { .name = TYPE_BCM2836_CONTROL, - .version_id = 1, + .version_id = 2, .minimum_version_id = 1, .fields = (VMStateField[]) { VMSTATE_UINT32_ARRAY(mailboxes, BCM2836ControlState, @@ -277,6 +371,9 @@ static const VMStateDescription vmstate_bcm2836_control = { VMSTATE_UINT32_ARRAY(timercontrol, BCM2836ControlState, BCM2836_NCORES), VMSTATE_UINT32_ARRAY(mailboxcontrol, BCM2836ControlState, BCM2836_NCORES), + VMSTATE_TIMER_V(timer, BCM2836ControlState, 2), + VMSTATE_UINT32_V(local_timer_control, BCM2836ControlState, 2), + VMSTATE_UINT8_V(route_localtimer, BCM2836ControlState, 2), VMSTATE_END_OF_LIST() } }; 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