/*
* ASPEED Interrupt Controller (New)
*
* Andrew Jeffery <andrew@aj.id.au>
*
* Copyright 2015, 2016 IBM Corp.
*
* This code is licensed under the GPL version 2 or later. See
* the COPYING file in the top-level directory.
*/
/* The hardware exposes two register sets, a legacy set and a 'new' set. The
* model implements the 'new' register set, and logs warnings on accesses to
* the legacy IO space.
*
* The hardware uses 32bit registers to manage 51 IRQs, with low and high
* registers for each conceptual register. The device model's implementation
* uses 64bit data types to store both low and high register values (in the one
* member), but must cope with access offset values in multiples of 4 passed to
* the callbacks. As such the read() and write() implementations process the
* provided offset to understand whether the access is requesting the lower or
* upper 32 bits of the 64bit member.
*
* Additionally, the "Interrupt Enable", "Edge Status" and "Software Interrupt"
* fields have separate "enable"/"status" and "clear" registers, where set bits
* are written to one or the other to change state (avoiding a
* read-modify-write sequence).
*/
#include "qemu/osdep.h"
#include "hw/intc/aspeed_vic.h"
#include "qemu/bitops.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "trace.h"
#define AVIC_NEW_BASE_OFFSET 0x80
#define AVIC_L_MASK 0xFFFFFFFFU
#define AVIC_H_MASK 0x0007FFFFU
#define AVIC_EVENT_W_MASK (0x78000ULL << 32)
static void aspeed_vic_update(AspeedVICState *s)
{
uint64_t new = (s->raw & s->enable);
uint64_t flags;
flags = new & s->select;
trace_aspeed_vic_update_fiq(!!flags);
qemu_set_irq(s->fiq, !!flags);
flags = new & ~s->select;
trace_aspeed_vic_update_irq(!!flags);
qemu_set_irq(s->irq, !!flags);
}
static void aspeed_vic_set_irq(void *opaque, int irq, int level)
{
uint64_t irq_mask;
bool raise;
AspeedVICState *s = (AspeedVICState *)opaque;
if (irq > ASPEED_VIC_NR_IRQS) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid interrupt number: %d\n",
__func__, irq);
return;
}
trace_aspeed_vic_set_irq(irq, level);
irq_mask = BIT(irq);
if (s->sense & irq_mask) {
/* level-triggered */
if (s->event & irq_mask) {
/* high-sensitive */
raise = level;
} else {
/* low-sensitive */
raise = !level;
}
s->raw = deposit64(s->raw, irq, 1, raise);
} else {
uint64_t old_level = s->level & irq_mask;
/* edge-triggered */
if (s->dual_edge & irq_mask) {
raise = (!!old_level) != (!!level);
} else {
if (s->event & irq_mask) {
/* rising-sensitive */
raise = !old_level && level;
} else {
/* falling-sensitive */
raise = old_level && !level;
}
}
if (raise) {
s->raw = deposit64(s->raw, irq, 1, raise);
}
}
s->level = deposit64(s->level, irq, 1, level);
aspeed_vic_update(s);
}
static uint64_t aspeed_vic_read(void *opaque, hwaddr offset, unsigned size)
{
uint64_t val;
const bool high = !!(offset & 0x4);
hwaddr n_offset = (offset & ~0x4);
AspeedVICState *s = (AspeedVICState *)opaque;
if (offset < AVIC_NEW_BASE_OFFSET) {
qemu_log_mask(LOG_UNIMP, "%s: Ignoring read from legacy registers "
"at 0x%" HWADDR_PRIx "[%u]\n", __func__, offset, size);
return 0;
}
n_offset -= AVIC_NEW_BASE_OFFSET;
switch (n_offset) {
case 0x0: /* IRQ Status */
val = s->raw & ~s->select & s->enable;
break;
case 0x08: /* FIQ Status */
val = s->raw & s->select & s->enable;
break;
case 0x10: /* Raw Interrupt Status */
val = s->raw;
break;
case 0x18: /* Interrupt Selection */
val = s->select;
break;
case 0x20: /* Interrupt Enable */
val = s->enable;
break;
case 0x30: /* Software Interrupt */
val = s->trigger;
break;
case 0x40: /* Interrupt Sensitivity */
val = s->sense;
break;
case 0x48: /* Interrupt Both Edge Trigger Control */
val = s->dual_edge;
break;
case 0x50: /* Interrupt Event */
val = s->event;
break;
case 0x60: /* Edge Triggered Interrupt Status */
val = s->raw & ~s->sense;
break;
/* Illegal */
case 0x28: /* Interrupt Enable Clear */
case 0x38: /* Software Interrupt Clear */
case 0x58: /* Edge Triggered Interrupt Clear */
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Read of write-only register with offset 0x%"
HWADDR_PRIx "\n", __func__, offset);
val = 0;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Bad register at offset 0x%" HWADDR_PRIx "\n",
__func__, offset);
val = 0;
break;
}
if (high) {
val = extract64(val, 32, 19);
}
trace_aspeed_vic_read(offset, size, val);
return val;
}
static void aspeed_vic_write(void *opaque, hwaddr offset, uint64_t data,
unsigned size)
{
const bool high = !!(offset & 0x4);
hwaddr n_offset = (offset & ~0x4);
AspeedVICState *s = (AspeedVICState *)opaque;
if (offset < AVIC_NEW_BASE_OFFSET) {
qemu_log_mask(LOG_UNIMP,
"%s: Ignoring write to legacy registers at 0x%"
HWADDR_PRIx "[%u] <- 0x%" PRIx64 "\n", __func__, offset,
size, data);
return;
}
n_offset -= AVIC_NEW_BASE_OFFSET;
trace_aspeed_vic_write(offset, size, data);
/* Given we have members using separate enable/clear registers, deposit64()
* isn't quite the tool for the job. Instead, relocate the incoming bits to
* the required bit offset based on the provided access address
*/
if (high) {
data &= AVIC_H_MASK;
data <<= 32;
} else {
data &= AVIC_L_MASK;
}
switch (n_offset) {
case 0x18: /* Interrupt Selection */
/* Register has deposit64() semantics - overwrite requested 32 bits */
if (high) {
s->select &= AVIC_L_MASK;
} else {
s->select &= ((uint64_t) AVIC_H_MASK) << 32;
}
s->select |= data;
break;
case 0x20: /* Interrupt Enable */
s->enable |= data;
break;
case 0x28: /* Interrupt Enable Clear */
s->enable &= ~data;
break;
case 0x30: /* Software Interrupt */
qemu_log_mask(LOG_UNIMP, "%s: Software interrupts unavailable. "
"IRQs requested: 0x%016" PRIx64 "\n", __func__, data);
break;
case 0x38: /* Software Interrupt Clear */
qemu_log_mask(LOG_UNIMP, "%s: Software interrupts unavailable. "
"IRQs to be cleared: 0x%016" PRIx64 "\n", __func__, data);
break;
case 0x50: /* Interrupt Event */
/* Register has deposit64() semantics - overwrite the top four valid
* IRQ bits, as only the top four IRQs (GPIOs) can change their event
* type */
if (high) {
s->event &= ~AVIC_EVENT_W_MASK;
s->event |= (data & AVIC_EVENT_W_MASK);
} else {
qemu_log_mask(LOG_GUEST_ERROR,
"Ignoring invalid write to interrupt event register");
}
break;
case 0x58: /* Edge Triggered Interrupt Clear */
s->raw &= ~(data & ~s->sense);
break;
case 0x00: /* IRQ Status */
case 0x08: /* FIQ Status */
case 0x10: /* Raw Interrupt Status */
case 0x40: /* Interrupt Sensitivity */
case 0x48: /* Interrupt Both Edge Trigger Control */
case 0x60: /* Edge Triggered Interrupt Status */
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Write of read-only register with offset 0x%"
HWADDR_PRIx "\n", __func__, offset);
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Bad register at offset 0x%" HWADDR_PRIx "\n",
__func__, offset);
break;
}
aspeed_vic_update(s);
}
static const MemoryRegionOps aspeed_vic_ops = {
.read = aspeed_vic_read,
.write = aspeed_vic_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid.min_access_size = 4,
.valid.max_access_size = 4,
.valid.unaligned = false,
};
static void aspeed_vic_reset(DeviceState *dev)
{
AspeedVICState *s = ASPEED_VIC(dev);
s->level = 0;
s->raw = 0;
s->select = 0;
s->enable = 0;
s->trigger = 0;
s->sense = 0x1F07FFF8FFFFULL;
s->dual_edge = 0xF800070000ULL;
s->event = 0x5F07FFF8FFFFULL;
}
#define AVIC_IO_REGION_SIZE 0x20000
static void aspeed_vic_realize(DeviceState *dev, Error **errp)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
AspeedVICState *s = ASPEED_VIC(dev);
memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_vic_ops, s,
TYPE_ASPEED_VIC, AVIC_IO_REGION_SIZE);
sysbus_init_mmio(sbd, &s->iomem);
qdev_init_gpio_in(dev, aspeed_vic_set_irq, ASPEED_VIC_NR_IRQS);
sysbus_init_irq(sbd, &s->irq);
sysbus_init_irq(sbd, &s->fiq);
}
static const VMStateDescription vmstate_aspeed_vic = {
.name = "aspeed.new-vic",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT64(level, AspeedVICState),
VMSTATE_UINT64(raw, AspeedVICState),
VMSTATE_UINT64(select, AspeedVICState),
VMSTATE_UINT64(enable, AspeedVICState),
VMSTATE_UINT64(trigger, AspeedVICState),
VMSTATE_UINT64(sense, AspeedVICState),
VMSTATE_UINT64(dual_edge, AspeedVICState),
VMSTATE_UINT64(event, AspeedVICState),
VMSTATE_END_OF_LIST()
}
};
static void aspeed_vic_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = aspeed_vic_realize;
dc->reset = aspeed_vic_reset;
dc->desc = "ASPEED Interrupt Controller (New)";
dc->vmsd = &vmstate_aspeed_vic;
}
static const TypeInfo aspeed_vic_info = {
.name = TYPE_ASPEED_VIC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(AspeedVICState),
.class_init = aspeed_vic_class_init,
};
static void aspeed_vic_register_types(void)
{
type_register_static(&aspeed_vic_info);
}
type_init(aspeed_vic_register_types);
