[v10,3/5] hw/intc: add allwinner A10 interrupt controller

Signed-off-by: liguang <lig.fnst@cn.fujitsu.com>
---
 default-configs/arm-softmmu.mak     |    1 +
 hw/intc/Makefile.objs               |    1 +
 hw/intc/allwinner-a10-pic.c         |  217 +++++++++++++++++++++++++++++++++++
 include/hw/intc/allwinner-a10-pic.h |   40 +++++++
 4 files changed, 259 insertions(+), 0 deletions(-)
 create mode 100644 hw/intc/allwinner-a10-pic.c
 create mode 100644 include/hw/intc/allwinner-a10-pic.h

On Mon, Dec 9, 2013 at 10:10 AM, liguang <lig.fnst@cn.fujitsu.com> wrote:
> Signed-off-by: liguang <lig.fnst@cn.fujitsu.com>
> ---
>  default-configs/arm-softmmu.mak     |    1 +
>  hw/intc/Makefile.objs               |    1 +
>  hw/intc/allwinner-a10-pic.c         |  217 +++++++++++++++++++++++++++++++++++
>  include/hw/intc/allwinner-a10-pic.h |   40 +++++++
>  4 files changed, 259 insertions(+), 0 deletions(-)
>  create mode 100644 hw/intc/allwinner-a10-pic.c
>  create mode 100644 include/hw/intc/allwinner-a10-pic.h
>
> diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
> index 7858abf..e965068 100644
> --- a/default-configs/arm-softmmu.mak
> +++ b/default-configs/arm-softmmu.mak
> @@ -83,3 +83,4 @@ CONFIG_SDHCI=y
>  CONFIG_INTEGRATOR_DEBUG=y
>
>  CONFIG_ALLWINNER_A10_PIT=y
> +CONFIG_ALLWINNER_A10_PIC=y
> diff --git a/hw/intc/Makefile.objs b/hw/intc/Makefile.objs
> index 47ac442..60eb936 100644
> --- a/hw/intc/Makefile.objs
> +++ b/hw/intc/Makefile.objs
> @@ -24,3 +24,4 @@ obj-$(CONFIG_OPENPIC_KVM) += openpic_kvm.o
>  obj-$(CONFIG_SH4) += sh_intc.o
>  obj-$(CONFIG_XICS) += xics.o
>  obj-$(CONFIG_XICS_KVM) += xics_kvm.o
> +obj-$(CONFIG_ALLWINNER_A10_PIC) += allwinner-a10-pic.o
> diff --git a/hw/intc/allwinner-a10-pic.c b/hw/intc/allwinner-a10-pic.c
> new file mode 100644
> index 0000000..9345741
> --- /dev/null
> +++ b/hw/intc/allwinner-a10-pic.c
> @@ -0,0 +1,217 @@
> +/*
> + * Allwinner A10 interrupt controller device emulation
> + *
> + * Copyright (C) 2013 Li Guang
> + * Written by Li Guang <lig.fnst@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/devices.h"
> +#include "sysemu/sysemu.h"
> +#include "hw/intc/allwinner-a10-pic.h"
> +
> +static void aw_a10_pic_update(AwA10PICState *s)
> +{
> +    uint8_t i, j;
> +    bool irq = false, fiq = false;
> +
> +    for (i = 0, j = 0; i < AW_A10_PIC_REG_NUM; i++) {
> +        if (s->irq_pending[i] == 0 && s->fiq_pending[i] == 0) {
> +            continue;
> +        }
> +        for (j = 0; j < 32; j++) {
> +            if (test_bit(j, (void *)&s->mask[i])) {
> +                continue;
> +            }
> +            if (test_bit(j, (void *)&s->irq_pending[i])) {
> +                irq = true;
> +            }
> +            if (test_bit(j, (void *)&s->fiq_pending[i]) &&
> +                test_bit(j, (void *)&s->select[i])) {
> +                fiq = true;
> +            }
> +            if (irq && fiq) {
> +                goto out;
> +            }
> +        }

So looking at this more closely, why not just:

irq ||= s->mask[i] & s->irq_pending[i];
fiq ||= s->mask[i] & s->fiq_pending[i] & s->select[i];

Instead of this inner for loop? Drop the fast path if above it as well.

I remember getting rid of the word-wise & | logic in an earlier
version because of cross-over between the three regs. But thats now
resolved here with the outer loop. This inner loop should be able to
be done with word-wise & | logic.

> +    }
> +
> +out:
> +    qemu_set_irq(s->parent_irq, irq);
> +    qemu_set_irq(s->parent_fiq, fiq);
> +}
> +
> +static void aw_a10_pic_set_irq(void *opaque, int irq, int level)
> +{
> +    AwA10PICState *s = opaque;
> +
> +    if (level) {
> +        set_bit(irq%32, (void *)&s->irq_pending[irq/32]);
> +    }
> +    aw_a10_pic_update(s);
> +}
> +
> +static uint64_t aw_a10_pic_read(void *opaque, hwaddr offset, unsigned size)
> +{
> +    AwA10PICState *s = opaque;
> +    uint8_t index = (offset & 0xc)/4;
> +
> +    switch (offset) {
> +    case AW_A10_PIC_VECTOR:
> +        return s->vector;
> +    case AW_A10_PIC_BASE_ADDR:
> +        return s->base_addr;
> +    case AW_A10_PIC_PROTECT:
> +        return s->protect;
> +    case AW_A10_PIC_NMI:
> +        return s->nmi;
> +    case AW_A10_PIC_IRQ_PENDING ... AW_A10_PIC_IRQ_PENDING + 8:
> +        return s->irq_pending[index];
> +    case AW_A10_PIC_FIQ_PENDING ... AW_A10_PIC_FIQ_PENDING + 8:
> +        return s->fiq_pending[index];
> +    case AW_A10_PIC_SELECT ... AW_A10_PIC_SELECT + 8:
> +        return s->select[index];
> +    case AW_A10_PIC_ENABLE ... AW_A10_PIC_ENABLE + 8:
> +        return s->enable[index];
> +    case AW_A10_PIC_MASK ... AW_A10_PIC_MASK + 8:
> +        return s->mask[index];
> +    default:
> +        qemu_log_mask(LOG_GUEST_ERROR,
> +                      "%s: Bad offset 0x%x\n",  __func__, (int)offset);
> +        break;
> +    }
> +
> +    return 0;
> +}
> +
> +static void aw_a10_pic_write(void *opaque, hwaddr offset, uint64_t value,
> +                             unsigned size)
> +{
> +    AwA10PICState *s = opaque;
> +    uint8_t index = (offset & 0xc)/4;
> +
> +    switch (offset) {
> +    case AW_A10_PIC_VECTOR:
> +        s->vector = value & ~0x3;
> +        break;
> +    case AW_A10_PIC_BASE_ADDR:
> +        s->base_addr = value & ~0x3;
> +    case AW_A10_PIC_PROTECT:
> +        s->protect = value;
> +        break;
> +    case AW_A10_PIC_NMI:
> +        s->nmi = value;
> +        break;
> +    case AW_A10_PIC_IRQ_PENDING ... AW_A10_PIC_IRQ_PENDING + 8:
> +        s->irq_pending[index] &= ~value;
> +        break;
> +    case AW_A10_PIC_FIQ_PENDING ... AW_A10_PIC_FIQ_PENDING + 8:
> +        s->fiq_pending[index] &= ~value;
> +        break;
> +    case AW_A10_PIC_SELECT ... AW_A10_PIC_SELECT + 8:
> +        s->select[index] = value;
> +        break;
> +    case AW_A10_PIC_ENABLE ... AW_A10_PIC_ENABLE + 8:
> +        s->enable[index] = value;
> +        break;
> +    case AW_A10_PIC_MASK ... AW_A10_PIC_MASK + 8:
> +        s->mask[index] = value;
> +        break;
> +    default:
> +        qemu_log_mask(LOG_GUEST_ERROR,
> +                      "%s: Bad offset 0x%x\n",  __func__, (int)offset);
> +        break;
> +    }
> +
> +    aw_a10_pic_update(s);
> +}
> +
> +static const MemoryRegionOps aw_a10_pic_ops = {
> +    .read = aw_a10_pic_read,
> +    .write = aw_a10_pic_write,
> +    .endianness = DEVICE_NATIVE_ENDIAN,
> +};
> +
> +static const VMStateDescription vmstate_aw_a10_pic = {
> +    .name = "a10.pic",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .minimum_version_id_old = 1,
> +    .fields = (VMStateField[]) {
> +        VMSTATE_UINT32(vector, AwA10PICState),
> +        VMSTATE_UINT32(base_addr, AwA10PICState),
> +        VMSTATE_UINT32(protect, AwA10PICState),
> +        VMSTATE_UINT32(nmi, AwA10PICState),
> +        VMSTATE_UINT32_ARRAY(irq_pending, AwA10PICState, AW_A10_PIC_REG_NUM),
> +        VMSTATE_UINT32_ARRAY(fiq_pending, AwA10PICState, AW_A10_PIC_REG_NUM),
> +        VMSTATE_UINT32_ARRAY(enable, AwA10PICState, AW_A10_PIC_REG_NUM),
> +        VMSTATE_UINT32_ARRAY(select, AwA10PICState, AW_A10_PIC_REG_NUM),
> +        VMSTATE_UINT32_ARRAY(mask, AwA10PICState, AW_A10_PIC_REG_NUM),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
> +static void aw_a10_pic_realize(DeviceState *ds, Error **errp)
> +{
> +    AwA10PICState *s = AW_A10_PIC(ds);
> +    SysBusDevice *dev = SYS_BUS_DEVICE(ds);
> +
> +     qdev_init_gpio_in(DEVICE(dev), aw_a10_pic_set_irq, AW_A10_PIC_INT_NR);
> +     sysbus_init_irq(dev, &s->parent_irq);
> +     sysbus_init_irq(dev, &s->parent_fiq);
> +     memory_region_init_io(&s->iomem, OBJECT(s), &aw_a10_pic_ops, s,
> +                           TYPE_AW_A10_PIC, 0x400);
> +     sysbus_init_mmio(dev, &s->iomem);
> +}

Same comment as for the timer patch re init conversion.

Regards,
Peter

> +
> +static void aw_a10_pic_reset(DeviceState *d)
> +{
> +    AwA10PICState *s = AW_A10_PIC(d);
> +    uint8_t i;
> +
> +    s->base_addr = 0;
> +    s->protect = 0;
> +    s->nmi = 0;
> +    s->vector = 0;
> +    for (i = 0; i < AW_A10_PIC_REG_NUM; i++) {
> +        s->irq_pending[i] = 0;
> +        s->fiq_pending[i] = 0;
> +        s->select[i] = 0;
> +        s->enable[i] = 0;
> +        s->mask[i] = 0;
> +    }
> +}
> +
> +static void aw_a10_pic_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +
> +    dc->realize = aw_a10_pic_realize;
> +    dc->reset = aw_a10_pic_reset;
> +    dc->desc = "allwinner a10 pic";
> +    dc->vmsd = &vmstate_aw_a10_pic;
> + }
> +
> +static const TypeInfo aw_a10_pic_info = {
> +    .name = TYPE_AW_A10_PIC,
> +    .parent = TYPE_SYS_BUS_DEVICE,
> +    .instance_size = sizeof(AwA10PICState),
> +    .class_init = aw_a10_pic_class_init,
> +};
> +
> +static void aw_a10_register_types(void)
> +{
> +    type_register_static(&aw_a10_pic_info);
> +}
> +
> +type_init(aw_a10_register_types);
> diff --git a/include/hw/intc/allwinner-a10-pic.h b/include/hw/intc/allwinner-a10-pic.h
> new file mode 100644
> index 0000000..5721b2e
> --- /dev/null
> +++ b/include/hw/intc/allwinner-a10-pic.h
> @@ -0,0 +1,40 @@
> +#ifndef AW_A10_PIC_H
> +#define AW_A10_PIC_H
> +
> +#define TYPE_AW_A10_PIC  "allwinner-a10-pic"
> +#define AW_A10_PIC(obj) OBJECT_CHECK(AwA10PICState, (obj), TYPE_AW_A10_PIC)
> +
> +#define AW_A10_PIC_VECTOR       0
> +#define AW_A10_PIC_BASE_ADDR    4
> +#define AW_A10_PIC_PROTECT      8
> +#define AW_A10_PIC_NMI          0xc
> +#define AW_A10_PIC_IRQ_PENDING  0x10
> +#define AW_A10_PIC_FIQ_PENDING  0x20
> +#define AW_A10_PIC_SELECT       0x30
> +#define AW_A10_PIC_ENABLE       0x40
> +#define AW_A10_PIC_MASK         0x50
> +
> +#define AW_A10_PIC_INT_NR       95
> +#define AW_A10_PIC_REG_NUM      DIV_ROUND_UP(AW_A10_PIC_INT_NR, 32)
> +
> +typedef struct AwA10PICState {
> +    /*< private >*/
> +    SysBusDevice parent_obj;
> +    /*< public >*/
> +    MemoryRegion iomem;
> +    qemu_irq parent_fiq;
> +    qemu_irq parent_irq;
> +
> +    uint32_t vector;
> +    uint32_t base_addr;
> +    uint32_t protect;
> +    uint32_t nmi;
> +    uint32_t irq_pending[AW_A10_PIC_REG_NUM];
> +    uint32_t fiq_pending[AW_A10_PIC_REG_NUM];
> +    uint32_t select[AW_A10_PIC_REG_NUM];
> +    uint32_t enable[AW_A10_PIC_REG_NUM];
> +    uint32_t mask[AW_A10_PIC_REG_NUM];
> +    /*priority setting here*/
> +} AwA10PICState;
> +
> +#endif
> --
> 1.7.2.5
>
>