On Wed, Nov 27, 2013 at 6:29 PM, liguang <lig.f...@cn.fujitsu.com> wrote:
> Signed-off-by: liguang <lig.f...@cn.fujitsu.com>
> ---
> default-configs/arm-softmmu.mak | 2 +
> hw/timer/Makefile.objs | 1 +
> hw/timer/sunxi-pit.c | 254
> +++++++++++++++++++++++++++++++++++++++
> include/hw/timer/sunxi-pit.h | 56 +++++++++
> 4 files changed, 313 insertions(+), 0 deletions(-)
> create mode 100644 hw/timer/sunxi-pit.c
> create mode 100644 include/hw/timer/sunxi-pit.h
>
> diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
> index a555eef..7bf5ad0 100644
> --- a/default-configs/arm-softmmu.mak
> +++ b/default-configs/arm-softmmu.mak
> @@ -81,3 +81,5 @@ CONFIG_VERSATILE_I2C=y
>
> CONFIG_SDHCI=y
> CONFIG_INTEGRATOR_DEBUG=y
> +
> +CONFIG_SUNXI_PIT=y
> diff --git a/hw/timer/Makefile.objs b/hw/timer/Makefile.objs
> index eca5905..f7888e9 100644
> --- a/hw/timer/Makefile.objs
> +++ b/hw/timer/Makefile.objs
> @@ -27,3 +27,4 @@ obj-$(CONFIG_SH4) += sh_timer.o
> obj-$(CONFIG_TUSB6010) += tusb6010.o
>
> obj-$(CONFIG_MC146818RTC) += mc146818rtc.o
> +obj-$(CONFIG_SUNXI_PIT) += sunxi-pit.o
> diff --git a/hw/timer/sunxi-pit.c b/hw/timer/sunxi-pit.c
> new file mode 100644
> index 0000000..19bc16c
> --- /dev/null
> +++ b/hw/timer/sunxi-pit.c
> @@ -0,0 +1,254 @@
> +/*
> + * Allwinner sunxi timer device emulation
May need to do global find/replace on sunxi, depending on outcoming of
the naming discussion.
> + *
> + * Copyright (C) 2013 Li Guang
> + * Written by Li Guang <lig.f...@cn.fujitsu.com>
> + *
> + * 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.
> + */
> +
> +#include "hw/sysbus.h"
> +#include "hw/ptimer.h"
> +#include "sysemu/sysemu.h"
> +#include "hw/timer/sunxi-pit.h"
> +
> +
> +static uint64_t sunxi_pit_read(void *opaque, hwaddr offset, unsigned size)
> +{
> + SunxiPITState *s = SUNXI_PIT(opaque);
> + uint8_t index;
> +
> + switch (offset) {
> + case SUNXI_TIMER_IRQ_EN:
> + return s->irq_enable;
> + case SUNXI_TIMER_IRQ_ST:
> + return s->irq_status;
> + case SUNXI_TIMER_BASE ... SUNXI_TIMER_BASE * 6 + SUNXI_TIMER_COUNT:
> + index = offset & 0xf0;
> + index >>= 4;
> + index -= 1;
> + switch (offset & 0x0f) {
> + case SUNXI_TIMER_CONTROL:
> + return s->control[index];
> + case SUNXI_TIMER_INTERVAL:
> + return s->interval[index];
> + case SUNXI_TIMER_COUNT:
> + s->count[index] = ptimer_get_count(s->timer[index]);
> + return s->count[index];
> + default:
> + qemu_log_mask(LOG_GUEST_ERROR,
> + "%s: Bad offset 0x%x\n", __func__, (int)offset);
> + break;
> + }
> + case SUNXI_WDOG_CONTROL:
> + break;
> + case SUNXI_WDOG_MODE:
> + break;
> + case SUNXI_COUNT_LO:
> + return s->count_lo;
> + break;
break after return.
git diff | grep "return" -A 1 | grep "break"
It's crude, but will find any you missed.
> + case SUNXI_COUNT_HI:
> + return s->count_hi;
> + break;
> + case SUNXI_COUNT_CTL:
> + return s->count_ctl;
> + default:
> + qemu_log_mask(LOG_GUEST_ERROR,
> + "%s: Bad offset 0x%x\n", __func__, (int)offset);
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static void sunxi_pit_write(void *opaque, hwaddr offset, uint64_t value,
> + unsigned size)
> +{
> + SunxiPITState *s = SUNXI_PIT(opaque);
> + uint8_t index;
> +
> + switch (offset) {
> + case SUNXI_TIMER_IRQ_EN:
> + s->irq_enable = value;
> + break;
> + case SUNXI_TIMER_IRQ_ST:
> + s->irq_status &= ~value;
> + break;
> + case SUNXI_TIMER_BASE ... SUNXI_TIMER_BASE * 6 + SUNXI_TIMER_COUNT:
> + index = offset & 0xf0;
> + index >>= 4;
> + index -= 1;
> + switch (offset & 0x0f) {
> + case SUNXI_TIMER_CONTROL:
> + s->control[index] = value;
> + if (s->control[index] & SUNXI_TIMER_RELOAD) {
> + ptimer_set_count(s->timer[index], s->interval[index]);
> + }
> + if (s->control[index] & SUNXI_TIMER_EN) {
> + ptimer_run(s->timer[index], 1);
> + } else {
> + ptimer_stop(s->timer[index]);
> + }
> + break;
> + case SUNXI_TIMER_INTERVAL:
> + s->interval[index] = value;
> + ptimer_set_count(s->timer[index], s->interval[index]);
> + break;
> + case SUNXI_TIMER_COUNT:
> + s->count[index] = value;
> + break;
> + default:
> + qemu_log_mask(LOG_GUEST_ERROR,
> + "%s: Bad offset 0x%x\n", __func__, (int)offset);
> + }
> + break;
> + case SUNXI_WDOG_CONTROL:
> + s->watch_dog_control = value;
> + break;
> + case SUNXI_WDOG_MODE:
> + s->watch_dog_mode = value;
> + break;
> + case SUNXI_COUNT_LO:
> + s->count_lo = value;
> + break;
> + case SUNXI_COUNT_HI:
> + s->count_hi = value;
> + break;
> + case SUNXI_COUNT_CTL:
> + s->count_ctl = value;
> + if (s->count_ctl & SUNXI_COUNT_RL_EN) {
> + s->count_lo = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
> + s->count_hi = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) >> 32;
> + s->count_ctl &= ~SUNXI_COUNT_RL_EN;
> + }
> + if (s->count_ctl & SUNXI_COUNT_CLR_EN) {
> + s->count_lo =0;
> + s->count_hi =0;
> + s->count_ctl &= ~SUNXI_COUNT_CLR_EN;
> + }
> + break;
> + default:
> + qemu_log_mask(LOG_GUEST_ERROR,
> + "%s: Bad offset 0x%x\n", __func__, (int)offset);
> + break;
> + }
> +}
> +
> +static const MemoryRegionOps sunxi_pit_ops = {
> + .read = sunxi_pit_read,
> + .write = sunxi_pit_write,
> + .endianness = DEVICE_NATIVE_ENDIAN,
> +};
> +
> +static const VMStateDescription vmstate_sunxi_pit = {
> + .name = "sunxi.pit",
> + .version_id = 1,
> + .minimum_version_id = 1,
> + .minimum_version_id_old = 1,
> + .fields = (VMStateField[]) {
> + VMSTATE_UINT32(irq_enable, SunxiPITState),
> + VMSTATE_UINT32(irq_status, SunxiPITState),
> + VMSTATE_UINT32_ARRAY(control, SunxiPITState, SUNXI_TIMER_NR),
> + VMSTATE_UINT32_ARRAY(interval, SunxiPITState, SUNXI_TIMER_NR),
> + VMSTATE_UINT32_ARRAY(count, SunxiPITState, SUNXI_TIMER_NR),
> + VMSTATE_UINT32(watch_dog_mode, SunxiPITState),
> + VMSTATE_UINT32(watch_dog_control, SunxiPITState),
> + VMSTATE_UINT32(count_lo, SunxiPITState),
> + VMSTATE_UINT32(count_hi, SunxiPITState),
> + VMSTATE_UINT32(count_ctl, SunxiPITState),
> + VMSTATE_PTIMER_ARRAY(timer, SunxiPITState, SUNXI_TIMER_NR),
> + VMSTATE_END_OF_LIST()
> + }
> +};
> +
> +static void sunxi_pit_reset(DeviceState *dev)
> +{
> + SunxiPITState *s = SUNXI_PIT(dev);
> + uint8_t i;
> +
> + s->irq_enable = 0;
> + s->irq_status = 0;
> + for (i = 0; i < 6; i++) {
> + s->control[i] = SUNXI_DEFAULT_CLOCK;
> + s->interval[i] = 0;
> + s->count[i] = 0;
> + ptimer_stop(s->timer[i]);
> + }
> + s->watch_dog_mode = 0;
> + s->watch_dog_control = 0;
> + s->count_lo = 0;
> + s->count_hi = 0;
> + s->count_ctl = 0;
> +}
> +
> +static void sunxi_pit_timer_cb(void *opaque)
> +{
> + SunxiPITState *s = SUNXI_PIT(opaque);
> + uint8_t i;
> +
> + for (i = 0; i < SUNXI_TIMER_NR; i++) {
> + if (s->control[i] & SUNXI_TIMER_EN &&
> + ptimer_get_count(s->timer[i]) == 0) {
> + s->irq_status |= 1 << i;
> + if (!(s->control[i] & SUNXI_TIMER_MODE)) {
> + ptimer_set_count(s->timer[i], s->interval[i]);
> + ptimer_run(s->timer[i], 1);
> + }
> + qemu_irq_raise(s->irq[i]);
I see that it's an edge triggered interrupt - makes a lot more sense
now. I think there is qemu_irq_pulse for this very purpose. But I also
think you are susceptible to spurious edges here however. If timer A
hits (and doesn't reload), and then timer B hits, I don't see what
stops this logic being reached for timer A again?
Regards,
Peter
> + }
> + qemu_irq_lower(s->irq[i]);
> + }
> +}
> +
> +static void sunxi_pit_realize(DeviceState *dev, Error **errp)
> +{
> + SunxiPITState *s = SUNXI_PIT(dev);
> + SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
> + QEMUBH *bh[SUNXI_TIMER_NR];
> + uint8_t i;
> +
> + for (i = 0; i < SUNXI_TIMER_NR; i++) {
> + sysbus_init_irq(sbd, &s->irq[i]);
> + }
> + memory_region_init_io(&s->iomem, OBJECT(s), &sunxi_pit_ops, s,
> + TYPE_SUNXI_PIT, 0x400);
> + sysbus_init_mmio(sbd, &s->iomem);
> +
> + for (i = 0; i < SUNXI_TIMER_NR; i++) {
> + bh[i] = qemu_bh_new(sunxi_pit_timer_cb, s);
> + s->timer[i] = ptimer_init(bh[i]);
> + ptimer_set_freq(s->timer[i], 240000);
> + }
> +}
> +
> +static void sunxi_pit_class_init(ObjectClass *klass, void *data)
> +{
> + DeviceClass *dc = DEVICE_CLASS(klass);
> +
> + dc->realize = sunxi_pit_realize;
> + dc->reset = sunxi_pit_reset;
> + dc->desc = "sunxi timer";
> + dc->vmsd = &vmstate_sunxi_pit;
> +}
> +
> +static const TypeInfo sunxi_pit_info = {
> + .name = TYPE_SUNXI_PIT,
> + .parent = TYPE_SYS_BUS_DEVICE,
> + .instance_size = sizeof(SunxiPITState),
> + .class_init = sunxi_pit_class_init,
> +};
> +
> +static void sunxi_register_types(void)
> +{
> + type_register_static(&sunxi_pit_info);
> +}
> +
> +type_init(sunxi_register_types);
> diff --git a/include/hw/timer/sunxi-pit.h b/include/hw/timer/sunxi-pit.h
> new file mode 100644
> index 0000000..7c84946
> --- /dev/null
> +++ b/include/hw/timer/sunxi-pit.h
> @@ -0,0 +1,56 @@
> +#ifndef SUNXI_PIT_H
> +#define SUNXI_PIT_H
> +
> +
> +#define TYPE_SUNXI_PIT "sunxi-timer"
> +#define SUNXI_PIT(obj) OBJECT_CHECK(SunxiPITState, (obj), TYPE_SUNXI_PIT)
> +
> +#define SUNXI_TIMER_NR 6
> +#define SUNXI_TIMER_IRQ 0x1
> +#define SUNXI_WDOG_IRQ 0x100
> +
> +#define SUNXI_TIMER_IRQ_EN 0
> +#define SUNXI_TIMER_IRQ_ST 0x4
> +
> +#define SUNXI_TIMER_CONTROL 0x0
> +#define SUNXI_TIMER_EN 0x1
> +#define SUNXI_TIMER_RELOAD 0x2
> +#define SUNXI_TIMER_MODE 0x80
> +
> +#define SUNXI_TIMER_INTERVAL 0x4
> +#define SUNXI_TIMER_COUNT 0x8
> +#define SUNXI_WDOG_CONTROL 0x90
> +#define SUNXI_WDOG_MODE 0x94
> +
> +#define SUNXI_COUNT_CTL 0xa0
> +#define SUNXI_COUNT_RL_EN 0x2
> +#define SUNXI_COUNT_CLR_EN 0x1
> +#define SUNXI_COUNT_LO 0xa4
> +#define SUNXI_COUNT_HI 0xa8
> +
> +#define SUNXI_TIMER_BASE 0x10
> +
> +#define SUNXI_DEFAULT_CLOCK 0x4
> +
> +typedef struct SunxiPITState {
> + /*< private >*/
> + SysBusDevice parent_obj;
> + /*< public >*/
> + qemu_irq irq[SUNXI_TIMER_NR];
> + ptimer_state *timer[SUNXI_TIMER_NR];
> + MemoryRegion iomem;
> +
> + uint32_t irq_enable;
> + uint32_t irq_status;
> + uint32_t control[SUNXI_TIMER_NR];
> + uint32_t interval[SUNXI_TIMER_NR];
> + uint32_t count[SUNXI_TIMER_NR];
> + uint32_t watch_dog_mode;
> + uint32_t watch_dog_control;
> + uint32_t count_lo;
> + uint32_t count_hi;
> + uint32_t count_ctl;
> +} SunxiPITState;
> +
> +#endif
> +
> --
> 1.7.2.5
>
>
