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/*
* Syborg interrupt controller.
*
* Copyright (c) 2008 CodeSourcery
*
* 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 "sysbus.h"
#include "syborg.h"
//#define DEBUG_SYBORG_INT
#ifdef DEBUG_SYBORG_INT
#define DPRINTF(fmt, ...) \
do { printf("syborg_int: " fmt , ## __VA_ARGS__); } while (0)
#define BADF(fmt, ...) \
do { fprintf(stderr, "syborg_int: error: " fmt , ## __VA_ARGS__); \
exit(1);} while (0)
#else
#define DPRINTF(fmt, ...) do {} while(0)
#define BADF(fmt, ...) \
do { fprintf(stderr, "syborg_int: error: " fmt , ## __VA_ARGS__);} while (0)
#endif
enum {
INT_ID = 0,
INT_STATUS = 1, /* number of pending interrupts */
INT_CURRENT = 2, /* next interrupt to be serviced */
INT_DISABLE_ALL = 3,
INT_DISABLE = 4,
INT_ENABLE = 5,
INT_TOTAL = 6
};
typedef struct {
unsigned level:1;
unsigned enabled:1;
} syborg_int_flags;
typedef struct {
SysBusDevice busdev;
int pending_count;
int num_irqs;
syborg_int_flags *flags;
qemu_irq parent_irq;
} SyborgIntState;
static void syborg_int_update(SyborgIntState *s)
{
DPRINTF("pending %d\n", s->pending_count);
qemu_set_irq(s->parent_irq, s->pending_count > 0);
}
static void syborg_int_set_irq(void *opaque, int irq, int level)
{
SyborgIntState *s = (SyborgIntState *)opaque;
if (s->flags[irq].level == level)
return;
s->flags[irq].level = level;
if (s->flags[irq].enabled) {
if (level)
s->pending_count++;
else
s->pending_count--;
syborg_int_update(s);
}
}
static uint32_t syborg_int_read(void *opaque, target_phys_addr_t offset)
{
SyborgIntState *s = (SyborgIntState *)opaque;
int i;
offset &= 0xfff;
switch (offset >> 2) {
case INT_ID:
return SYBORG_ID_INT;
case INT_STATUS:
DPRINTF("read status=%d\n", s->pending_count);
return s->pending_count;
case INT_CURRENT:
for (i = 0; i < s->num_irqs; i++) {
if (s->flags[i].level & s->flags[i].enabled) {
DPRINTF("read current=%d\n", i);
return i;
}
}
DPRINTF("read current=none\n");
return 0xffffffffu;
default:
cpu_abort(cpu_single_env, "syborg_int_read: Bad offset %x\n",
(int)offset);
return 0;
}
}
static void syborg_int_write(void *opaque, target_phys_addr_t offset, uint32_t value)
{
SyborgIntState *s = (SyborgIntState *)opaque;
int i;
offset &= 0xfff;
DPRINTF("syborg_int_write offset=%d val=%d\n", (int)offset, (int)value);
switch (offset >> 2) {
case INT_DISABLE_ALL:
s->pending_count = 0;
for (i = 0; i < s->num_irqs; i++)
s->flags[i].enabled = 0;
break;
case INT_DISABLE:
if (value >= s->num_irqs)
break;
if (s->flags[value].enabled) {
if (s->flags[value].enabled)
s->pending_count--;
s->flags[value].enabled = 0;
}
break;
case INT_ENABLE:
if (value >= s->num_irqs)
break;
if (!(s->flags[value].enabled)) {
if(s->flags[value].level)
s->pending_count++;
s->flags[value].enabled = 1;
}
break;
default:
cpu_abort(cpu_single_env, "syborg_int_write: Bad offset %x\n",
(int)offset);
return;
}
syborg_int_update(s);
}
static CPUReadMemoryFunc *syborg_int_readfn[] = {
syborg_int_read,
syborg_int_read,
syborg_int_read
};
static CPUWriteMemoryFunc *syborg_int_writefn[] = {
syborg_int_write,
syborg_int_write,
syborg_int_write
};
static void syborg_int_save(QEMUFile *f, void *opaque)
{
SyborgIntState *s = (SyborgIntState *)opaque;
int i;
qemu_put_be32(f, s->num_irqs);
qemu_put_be32(f, s->pending_count);
for (i = 0; i < s->num_irqs; i++) {
qemu_put_be32(f, s->flags[i].enabled
| ((unsigned)s->flags[i].level << 1));
}
}
static int syborg_int_load(QEMUFile *f, void *opaque, int version_id)
{
SyborgIntState *s = (SyborgIntState *)opaque;
uint32_t val;
int i;
if (version_id != 1)
return -EINVAL;
val = qemu_get_be32(f);
if (val != s->num_irqs)
return -EINVAL;
s->pending_count = qemu_get_be32(f);
for (i = 0; i < s->num_irqs; i++) {
val = qemu_get_be32(f);
s->flags[i].enabled = val & 1;
s->flags[i].level = (val >> 1) & 1;
}
return 0;
}
static void syborg_int_init(SysBusDevice *dev)
{
SyborgIntState *s = FROM_SYSBUS(SyborgIntState, dev);
int iomemtype;
sysbus_init_irq(dev, &s->parent_irq);
s->num_irqs = qdev_get_prop_int(&dev->qdev, "num-interrupts", 64);
qdev_init_gpio_in(&dev->qdev, syborg_int_set_irq, s->num_irqs);
iomemtype = cpu_register_io_memory(syborg_int_readfn,
syborg_int_writefn, s);
sysbus_init_mmio(dev, 0x1000, iomemtype);
s->flags = qemu_mallocz(s->num_irqs * sizeof(syborg_int_flags));
register_savevm("syborg_int", -1, 1, syborg_int_save, syborg_int_load, s);
}
static void syborg_interrupt_register_devices(void)
{
sysbus_register_dev("syborg,interrupt", sizeof(SyborgIntState),
syborg_int_init);
}
device_init(syborg_interrupt_register_devices)
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