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/*
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* LatticeMico32 CPU interrupt controller logic.
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*
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* Copyright (c) 2010 Michael Walle <michael@walle.cc>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <assert.h>
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#include "hw.h"
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#include "pc.h"
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#include "monitor.h"
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#include "sysbus.h"
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#include "trace.h"
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#include "lm32_pic.h"
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struct LM32PicState {
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SysBusDevice busdev;
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qemu_irq parent_irq;
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uint32_t im; /* interrupt mask */
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uint32_t ip; /* interrupt pending */
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uint32_t irq_state;
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/* statistics */
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uint32_t stats_irq_count[32];
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};
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typedef struct LM32PicState LM32PicState;
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static LM32PicState *pic;
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void pic_info(Monitor *mon)
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{
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if (pic == NULL) {
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return;
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}
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monitor_printf(mon, "lm32-pic: im=%08x ip=%08x irq_state=%08x\n",
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pic->im, pic->ip, pic->irq_state);
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}
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void irq_info(Monitor *mon)
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{
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int i;
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uint32_t count;
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if (pic == NULL) {
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return;
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}
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monitor_printf(mon, "IRQ statistics:\n");
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for (i = 0; i < 32; i++) {
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count = pic->stats_irq_count[i];
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if (count > 0) {
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monitor_printf(mon, "%2d: %u\n", i, count);
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}
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}
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}
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static void update_irq(LM32PicState *s)
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{
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s->ip |= s->irq_state;
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if (s->ip & s->im) {
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trace_lm32_pic_raise_irq();
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qemu_irq_raise(s->parent_irq);
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} else {
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trace_lm32_pic_lower_irq();
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qemu_irq_lower(s->parent_irq);
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}
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}
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static void irq_handler(void *opaque, int irq, int level)
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{
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LM32PicState *s = opaque;
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assert(irq < 32);
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trace_lm32_pic_interrupt(irq, level);
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if (level) {
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s->irq_state |= (1 << irq);
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s->stats_irq_count[irq]++;
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} else {
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s->irq_state &= ~(1 << irq);
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}
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update_irq(s);
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}
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void lm32_pic_set_im(DeviceState *d, uint32_t im)
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{
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LM32PicState *s = container_of(d, LM32PicState, busdev.qdev);
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trace_lm32_pic_set_im(im);
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s->im = im;
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update_irq(s);
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}
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void lm32_pic_set_ip(DeviceState *d, uint32_t ip)
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{
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LM32PicState *s = container_of(d, LM32PicState, busdev.qdev);
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trace_lm32_pic_set_ip(ip);
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/* ack interrupt */
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s->ip &= ~ip;
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update_irq(s);
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}
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uint32_t lm32_pic_get_im(DeviceState *d)
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{
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LM32PicState *s = container_of(d, LM32PicState, busdev.qdev);
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trace_lm32_pic_get_im(s->im);
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return s->im;
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}
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uint32_t lm32_pic_get_ip(DeviceState *d)
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{
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LM32PicState *s = container_of(d, LM32PicState, busdev.qdev);
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trace_lm32_pic_get_ip(s->ip);
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return s->ip;
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}
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static void pic_reset(DeviceState *d)
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{
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LM32PicState *s = container_of(d, LM32PicState, busdev.qdev);
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int i;
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s->im = 0;
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s->ip = 0;
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s->irq_state = 0;
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for (i = 0; i < 32; i++) {
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s->stats_irq_count[i] = 0;
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}
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}
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static int lm32_pic_init(SysBusDevice *dev)
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{
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LM32PicState *s = FROM_SYSBUS(typeof(*s), dev);
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qdev_init_gpio_in(&dev->qdev, irq_handler, 32);
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sysbus_init_irq(dev, &s->parent_irq);
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pic = s;
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return 0;
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}
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static const VMStateDescription vmstate_lm32_pic = {
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.name = "lm32-pic",
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.version_id = 1,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(im, LM32PicState),
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VMSTATE_UINT32(ip, LM32PicState),
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VMSTATE_UINT32(irq_state, LM32PicState),
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VMSTATE_UINT32_ARRAY(stats_irq_count, LM32PicState, 32),
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VMSTATE_END_OF_LIST()
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}
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};
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static SysBusDeviceInfo lm32_pic_info = {
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.init = lm32_pic_init,
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.qdev.name = "lm32-pic",
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.qdev.size = sizeof(LM32PicState),
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.qdev.vmsd = &vmstate_lm32_pic,
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.qdev.reset = pic_reset,
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};
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static void lm32_pic_register(void)
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{
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sysbus_register_withprop(&lm32_pic_info);
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}
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device_init(lm32_pic_register)
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