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/*
* QEMU Sparc Sun4c interrupt controller emulation
*
* Based on slavio_intctl, copyright (c) 2003-2005 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 "hw/hw.h"
#include "hw/sparc/sun4m.h"
#include "monitor/monitor.h"
#include "hw/sysbus.h"
//#define DEBUG_IRQ_COUNT
//#define DEBUG_IRQ
#ifdef DEBUG_IRQ
#define DPRINTF(fmt, ...) \
do { printf("IRQ: " fmt , ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...)
#endif
/*
* Registers of interrupt controller in sun4c.
*
*/
#define MAX_PILS 16
typedef struct Sun4c_INTCTLState {
SysBusDevice busdev;
MemoryRegion iomem;
#ifdef DEBUG_IRQ_COUNT
uint64_t irq_count;
#endif
qemu_irq cpu_irqs[MAX_PILS];
const uint32_t *intbit_to_level;
uint32_t pil_out;
uint8_t reg;
uint8_t pending;
} Sun4c_INTCTLState;
#define INTCTL_SIZE 1
static void sun4c_check_interrupts(void *opaque);
static uint64_t sun4c_intctl_mem_read(void *opaque, hwaddr addr,
unsigned size)
{
Sun4c_INTCTLState *s = opaque;
uint32_t ret;
ret = s->reg;
DPRINTF("read reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);
return ret;
}
static void sun4c_intctl_mem_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
Sun4c_INTCTLState *s = opaque;
DPRINTF("write reg 0x" TARGET_FMT_plx " = %x\n", addr, (unsigned)val);
val &= 0xbf;
s->reg = val;
sun4c_check_interrupts(s);
}
static const MemoryRegionOps sun4c_intctl_mem_ops = {
.read = sun4c_intctl_mem_read,
.write = sun4c_intctl_mem_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 1,
},
};
static const uint32_t intbit_to_level[] = { 0, 1, 4, 6, 8, 10, 0, 14, };
static void sun4c_check_interrupts(void *opaque)
{
Sun4c_INTCTLState *s = opaque;
uint32_t pil_pending;
unsigned int i;
pil_pending = 0;
if (s->pending && !(s->reg & 0x80000000)) {
for (i = 0; i < 8; i++) {
if (s->pending & (1 << i))
pil_pending |= 1 << intbit_to_level[i];
}
}
for (i = 0; i < MAX_PILS; i++) {
if (pil_pending & (1 << i)) {
if (!(s->pil_out & (1 << i)))
qemu_irq_raise(s->cpu_irqs[i]);
} else {
if (s->pil_out & (1 << i))
qemu_irq_lower(s->cpu_irqs[i]);
}
}
s->pil_out = pil_pending;
}
/*
* "irq" here is the bit number in the system interrupt register
*/
static void sun4c_set_irq(void *opaque, int irq, int level)
{
Sun4c_INTCTLState *s = opaque;
uint32_t mask = 1 << irq;
uint32_t pil = intbit_to_level[irq];
DPRINTF("Set irq %d -> pil %d level %d\n", irq, pil,
level);
if (pil > 0) {
if (level) {
#ifdef DEBUG_IRQ_COUNT
s->irq_count++;
#endif
s->pending |= mask;
} else {
s->pending &= ~mask;
}
sun4c_check_interrupts(s);
}
}
static const VMStateDescription vmstate_sun4c_intctl = {
.name ="sun4c_intctl",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField []) {
VMSTATE_UINT8(reg, Sun4c_INTCTLState),
VMSTATE_UINT8(pending, Sun4c_INTCTLState),
VMSTATE_END_OF_LIST()
}
};
static void sun4c_intctl_reset(DeviceState *d)
{
Sun4c_INTCTLState *s = container_of(d, Sun4c_INTCTLState, busdev.qdev);
s->reg = 1;
s->pending = 0;
}
static int sun4c_intctl_init1(SysBusDevice *dev)
{
Sun4c_INTCTLState *s = FROM_SYSBUS(Sun4c_INTCTLState, dev);
unsigned int i;
memory_region_init_io(&s->iomem, &sun4c_intctl_mem_ops, s,
"intctl", INTCTL_SIZE);
sysbus_init_mmio(dev, &s->iomem);
qdev_init_gpio_in(&dev->qdev, sun4c_set_irq, 8);
for (i = 0; i < MAX_PILS; i++) {
sysbus_init_irq(dev, &s->cpu_irqs[i]);
}
return 0;
}
static void sun4c_intctl_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
k->init = sun4c_intctl_init1;
dc->reset = sun4c_intctl_reset;
dc->vmsd = &vmstate_sun4c_intctl;
}
static const TypeInfo sun4c_intctl_info = {
.name = "sun4c_intctl",
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(Sun4c_INTCTLState),
.class_init = sun4c_intctl_class_init,
};
static void sun4c_intctl_register_types(void)
{
type_register_static(&sun4c_intctl_info);
}
type_init(sun4c_intctl_register_types)
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