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/*
* Raspberry Pi emulation (c) 2012 Gregory Estrade
* Refactoring for Pi2 Copyright (c) 2015, Microsoft. Written by Andrew Baumann.
* This code is licensed under the GNU GPLv2 and later.
* Heavily based on pl190.c, copyright terms below:
*
* Arm PrimeCell PL190 Vector Interrupt Controller
*
* Copyright (c) 2006 CodeSourcery.
* Written by Paul Brook
*
* This code is licensed under the GPL.
*/
#include "qemu/osdep.h"
#include "hw/intc/bcm2835_ic.h"
#include "qemu/log.h"
#include "qemu/module.h"
#define GPU_IRQS 64
#define ARM_IRQS 8
#define IRQ_PENDING_BASIC 0x00 /* IRQ basic pending */
#define IRQ_PENDING_1 0x04 /* IRQ pending 1 */
#define IRQ_PENDING_2 0x08 /* IRQ pending 2 */
#define FIQ_CONTROL 0x0C /* FIQ register */
#define IRQ_ENABLE_1 0x10 /* Interrupt enable register 1 */
#define IRQ_ENABLE_2 0x14 /* Interrupt enable register 2 */
#define IRQ_ENABLE_BASIC 0x18 /* Base interrupt enable register */
#define IRQ_DISABLE_1 0x1C /* Interrupt disable register 1 */
#define IRQ_DISABLE_2 0x20 /* Interrupt disable register 2 */
#define IRQ_DISABLE_BASIC 0x24 /* Base interrupt disable register */
/* Update interrupts. */
static void bcm2835_ic_update(BCM2835ICState *s)
{
bool set = false;
if (s->fiq_enable) {
if (s->fiq_select >= GPU_IRQS) {
/* ARM IRQ */
set = extract32(s->arm_irq_level, s->fiq_select - GPU_IRQS, 1);
} else {
set = extract64(s->gpu_irq_level, s->fiq_select, 1);
}
}
qemu_set_irq(s->fiq, set);
set = (s->gpu_irq_level & s->gpu_irq_enable)
|| (s->arm_irq_level & s->arm_irq_enable);
qemu_set_irq(s->irq, set);
}
static void bcm2835_ic_set_gpu_irq(void *opaque, int irq, int level)
{
BCM2835ICState *s = opaque;
assert(irq >= 0 && irq < 64);
s->gpu_irq_level = deposit64(s->gpu_irq_level, irq, 1, level != 0);
bcm2835_ic_update(s);
}
static void bcm2835_ic_set_arm_irq(void *opaque, int irq, int level)
{
BCM2835ICState *s = opaque;
assert(irq >= 0 && irq < 8);
s->arm_irq_level = deposit32(s->arm_irq_level, irq, 1, level != 0);
bcm2835_ic_update(s);
}
static const int irq_dups[] = { 7, 9, 10, 18, 19, 53, 54, 55, 56, 57, 62 };
static uint64_t bcm2835_ic_read(void *opaque, hwaddr offset, unsigned size)
{
BCM2835ICState *s = opaque;
uint32_t res = 0;
uint64_t gpu_pending = s->gpu_irq_level & s->gpu_irq_enable;
int i;
switch (offset) {
case IRQ_PENDING_BASIC:
/* bits 0-7: ARM irqs */
res = s->arm_irq_level & s->arm_irq_enable;
/* bits 8 & 9: pending registers 1 & 2 */
res |= (((uint32_t)gpu_pending) != 0) << 8;
res |= ((gpu_pending >> 32) != 0) << 9;
/* bits 10-20: selected GPU IRQs */
for (i = 0; i < ARRAY_SIZE(irq_dups); i++) {
res |= extract64(gpu_pending, irq_dups[i], 1) << (i + 10);
}
break;
case IRQ_PENDING_1:
res = gpu_pending;
break;
case IRQ_PENDING_2:
res = gpu_pending >> 32;
break;
case FIQ_CONTROL:
res = (s->fiq_enable << 7) | s->fiq_select;
break;
case IRQ_ENABLE_1:
res = s->gpu_irq_enable;
break;
case IRQ_ENABLE_2:
res = s->gpu_irq_enable >> 32;
break;
case IRQ_ENABLE_BASIC:
res = s->arm_irq_enable;
break;
case IRQ_DISABLE_1:
res = ~s->gpu_irq_enable;
break;
case IRQ_DISABLE_2:
res = ~s->gpu_irq_enable >> 32;
break;
case IRQ_DISABLE_BASIC:
res = ~s->arm_irq_enable;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
__func__, offset);
return 0;
}
return res;
}
static void bcm2835_ic_write(void *opaque, hwaddr offset, uint64_t val,
unsigned size)
{
BCM2835ICState *s = opaque;
switch (offset) {
case FIQ_CONTROL:
s->fiq_select = extract32(val, 0, 7);
s->fiq_enable = extract32(val, 7, 1);
break;
case IRQ_ENABLE_1:
s->gpu_irq_enable |= val;
break;
case IRQ_ENABLE_2:
s->gpu_irq_enable |= val << 32;
break;
case IRQ_ENABLE_BASIC:
s->arm_irq_enable |= val & 0xff;
break;
case IRQ_DISABLE_1:
s->gpu_irq_enable &= ~val;
break;
case IRQ_DISABLE_2:
s->gpu_irq_enable &= ~(val << 32);
break;
case IRQ_DISABLE_BASIC:
s->arm_irq_enable &= ~val & 0xff;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
__func__, offset);
return;
}
bcm2835_ic_update(s);
}
static const MemoryRegionOps bcm2835_ic_ops = {
.read = bcm2835_ic_read,
.write = bcm2835_ic_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid.min_access_size = 4,
.valid.max_access_size = 4,
};
static void bcm2835_ic_reset(DeviceState *d)
{
BCM2835ICState *s = BCM2835_IC(d);
s->gpu_irq_enable = 0;
s->arm_irq_enable = 0;
s->fiq_enable = false;
s->fiq_select = 0;
}
static void bcm2835_ic_init(Object *obj)
{
BCM2835ICState *s = BCM2835_IC(obj);
memory_region_init_io(&s->iomem, obj, &bcm2835_ic_ops, s, TYPE_BCM2835_IC,
0x200);
sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
qdev_init_gpio_in_named(DEVICE(s), bcm2835_ic_set_gpu_irq,
BCM2835_IC_GPU_IRQ, GPU_IRQS);
qdev_init_gpio_in_named(DEVICE(s), bcm2835_ic_set_arm_irq,
BCM2835_IC_ARM_IRQ, ARM_IRQS);
sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
sysbus_init_irq(SYS_BUS_DEVICE(s), &s->fiq);
}
static const VMStateDescription vmstate_bcm2835_ic = {
.name = TYPE_BCM2835_IC,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT64(gpu_irq_level, BCM2835ICState),
VMSTATE_UINT64(gpu_irq_enable, BCM2835ICState),
VMSTATE_UINT8(arm_irq_level, BCM2835ICState),
VMSTATE_UINT8(arm_irq_enable, BCM2835ICState),
VMSTATE_BOOL(fiq_enable, BCM2835ICState),
VMSTATE_UINT8(fiq_select, BCM2835ICState),
VMSTATE_END_OF_LIST()
}
};
static void bcm2835_ic_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->reset = bcm2835_ic_reset;
dc->vmsd = &vmstate_bcm2835_ic;
}
static TypeInfo bcm2835_ic_info = {
.name = TYPE_BCM2835_IC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(BCM2835ICState),
.class_init = bcm2835_ic_class_init,
.instance_init = bcm2835_ic_init,
};
static void bcm2835_ic_register_types(void)
{
type_register_static(&bcm2835_ic_info);
}
type_init(bcm2835_ic_register_types)
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