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/*
* Heathrow PIC support (standard PowerMac PIC)
*
* Copyright (c) 2005 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "vl.h"
//#define DEBUG
typedef struct HeathrowPIC {
uint32_t events;
uint32_t mask;
uint32_t levels;
uint32_t level_triggered;
} HeathrowPIC;
typedef struct HeathrowPICS {
HeathrowPIC pics[2];
} HeathrowPICS;
static inline int check_irq(HeathrowPIC *pic)
{
return (pic->events | (pic->levels & pic->level_triggered)) & pic->mask;
}
/* update the CPU irq state */
static void heathrow_pic_update(HeathrowPICS *s)
{
if (check_irq(&s->pics[0]) || check_irq(&s->pics[1])) {
cpu_interrupt(first_cpu, CPU_INTERRUPT_HARD);
} else {
cpu_reset_interrupt(first_cpu, CPU_INTERRUPT_HARD);
}
}
static void pic_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
{
HeathrowPICS *s = opaque;
HeathrowPIC *pic;
unsigned int n;
value = bswap32(value);
#ifdef DEBUG
printf("pic_writel: %08x: %08x\n",
addr, value);
#endif
n = ((addr & 0xfff) - 0x10) >> 4;
if (n >= 2)
return;
pic = &s->pics[n];
switch(addr & 0xf) {
case 0x04:
pic->mask = value;
heathrow_pic_update(s);
break;
case 0x08:
/* do not reset level triggered IRQs */
value &= ~pic->level_triggered;
pic->events &= ~value;
heathrow_pic_update(s);
break;
default:
break;
}
}
static uint32_t pic_readl (void *opaque, target_phys_addr_t addr)
{
HeathrowPICS *s = opaque;
HeathrowPIC *pic;
unsigned int n;
uint32_t value;
n = ((addr & 0xfff) - 0x10) >> 4;
if (n >= 2) {
value = 0;
} else {
pic = &s->pics[n];
switch(addr & 0xf) {
case 0x0:
value = pic->events;
break;
case 0x4:
value = pic->mask;
break;
case 0xc:
value = pic->levels;
break;
default:
value = 0;
break;
}
}
#ifdef DEBUG
printf("pic_readl: %08x: %08x\n",
addr, value);
#endif
value = bswap32(value);
return value;
}
static CPUWriteMemoryFunc *pic_write[] = {
&pic_writel,
&pic_writel,
&pic_writel,
};
static CPUReadMemoryFunc *pic_read[] = {
&pic_readl,
&pic_readl,
&pic_readl,
};
static void heathrow_pic_set_irq(void *opaque, int num, int level)
{
HeathrowPICS *s = opaque;
HeathrowPIC *pic;
unsigned int irq_bit;
#if defined(DEBUG)
{
static int last_level[64];
if (last_level[num] != level) {
printf("set_irq: num=0x%02x level=%d\n", num, level);
last_level[num] = level;
}
}
#endif
pic = &s->pics[1 - (num >> 5)];
irq_bit = 1 << (num & 0x1f);
if (level) {
pic->events |= irq_bit & ~pic->level_triggered;
pic->levels |= irq_bit;
} else {
pic->levels &= ~irq_bit;
}
heathrow_pic_update(s);
}
qemu_irq *heathrow_pic_init(int *pmem_index)
{
HeathrowPICS *s;
s = qemu_mallocz(sizeof(HeathrowPICS));
s->pics[0].level_triggered = 0;
s->pics[1].level_triggered = 0x1ff00000;
*pmem_index = cpu_register_io_memory(0, pic_read, pic_write, s);
return qemu_allocate_irqs(heathrow_pic_set_irq, s, 64);
}
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