Archipelago » qemu

/*

 *  LatticeMico32 CPU interrupt controller logic.

 *

 *  Copyright (c) 2010 Michael Walle <michael@walle.cc>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#include <assert.h>

#include "hw.h"

#include "pc.h"

#include "monitor.h"

#include "sysbus.h"

#include "trace.h"

#include "lm32_pic.h"

struct LM32PicState {

    SysBusDevice busdev;

    qemu_irq parent_irq;

    uint32_t im;        /* interrupt mask */

    uint32_t ip;        /* interrupt pending */

    uint32_t irq_state;

    /* statistics */

    uint32_t stats_irq_count[32];

};

typedef struct LM32PicState LM32PicState;

static LM32PicState *pic;

void pic_info(Monitor *mon)

{

    if (pic == NULL) {

        return;

    }

    monitor_printf(mon, "lm32-pic: im=%08x ip=%08x irq_state=%08x\n",

            pic->im, pic->ip, pic->irq_state);

}

void irq_info(Monitor *mon)

{

    int i;

    uint32_t count;

    if (pic == NULL) {

        return;

    }

    monitor_printf(mon, "IRQ statistics:\n");

    for (i = 0; i < 32; i++) {

        count = pic->stats_irq_count[i];

        if (count > 0) {

            monitor_printf(mon, "%2d: %u\n", i, count);

        }

    }

}

static void update_irq(LM32PicState *s)

{

    s->ip |= s->irq_state;

    if (s->ip & s->im) {

        trace_lm32_pic_raise_irq();

        qemu_irq_raise(s->parent_irq);

    } else {

        trace_lm32_pic_lower_irq();

        qemu_irq_lower(s->parent_irq);

    }

}

static void irq_handler(void *opaque, int irq, int level)

{

    LM32PicState *s = opaque;

    assert(irq < 32);

    trace_lm32_pic_interrupt(irq, level);

    if (level) {

        s->irq_state |= (1 << irq);

        s->stats_irq_count[irq]++;

    } else {

        s->irq_state &= ~(1 << irq);

    }

    update_irq(s);

}

void lm32_pic_set_im(DeviceState *d, uint32_t im)

{

    LM32PicState *s = container_of(d, LM32PicState, busdev.qdev);

    trace_lm32_pic_set_im(im);

    s->im = im;

    update_irq(s);

}

void lm32_pic_set_ip(DeviceState *d, uint32_t ip)

{

    LM32PicState *s = container_of(d, LM32PicState, busdev.qdev);

    trace_lm32_pic_set_ip(ip);

    /* ack interrupt */

    s->ip &= ~ip;

    update_irq(s);

}

uint32_t lm32_pic_get_im(DeviceState *d)

{

    LM32PicState *s = container_of(d, LM32PicState, busdev.qdev);

    trace_lm32_pic_get_im(s->im);

    return s->im;

}

uint32_t lm32_pic_get_ip(DeviceState *d)

{

    LM32PicState *s = container_of(d, LM32PicState, busdev.qdev);

    trace_lm32_pic_get_ip(s->ip);

    return s->ip;

}

static void pic_reset(DeviceState *d)

{

    LM32PicState *s = container_of(d, LM32PicState, busdev.qdev);

    int i;

    s->im = 0;

    s->ip = 0;

    s->irq_state = 0;

    for (i = 0; i < 32; i++) {

        s->stats_irq_count[i] = 0;

    }

}

static int lm32_pic_init(SysBusDevice *dev)

{

    LM32PicState *s = FROM_SYSBUS(typeof(*s), dev);

    qdev_init_gpio_in(&dev->qdev, irq_handler, 32);

    sysbus_init_irq(dev, &s->parent_irq);

    pic = s;

    return 0;

}

static const VMStateDescription vmstate_lm32_pic = {

    .name = "lm32-pic",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields      = (VMStateField[]) {

        VMSTATE_UINT32(im, LM32PicState),

        VMSTATE_UINT32(ip, LM32PicState),

        VMSTATE_UINT32(irq_state, LM32PicState),

        VMSTATE_UINT32_ARRAY(stats_irq_count, LM32PicState, 32),

        VMSTATE_END_OF_LIST()

    }

};

static SysBusDeviceInfo lm32_pic_info = {

    .init = lm32_pic_init,

    .qdev.name  = "lm32-pic",

    .qdev.size  = sizeof(LM32PicState),

    .qdev.vmsd  = &vmstate_lm32_pic,

    .qdev.reset = pic_reset,

};

static void lm32_pic_register(void)

{

    sysbus_register_withprop(&lm32_pic_info);

}

device_init(lm32_pic_register)