/*
* "Universal" Interrupt Controller for PowerPPC 4xx embedded processors
*
* Copyright (c) 2007 Jocelyn Mayer
*
* 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 "qemu/osdep.h"
#include "include/hw/intc/ppc-uic.h"
#include "hw/irq.h"
#include "cpu.h"
#include "hw/ppc/ppc.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#include "qapi/error.h"
enum {
DCR_UICSR = 0x000,
DCR_UICSRS = 0x001,
DCR_UICER = 0x002,
DCR_UICCR = 0x003,
DCR_UICPR = 0x004,
DCR_UICTR = 0x005,
DCR_UICMSR = 0x006,
DCR_UICVR = 0x007,
DCR_UICVCR = 0x008,
DCR_UICMAX = 0x009,
};
/*#define DEBUG_UIC*/
#ifdef DEBUG_UIC
# define LOG_UIC(...) qemu_log_mask(CPU_LOG_INT, ## __VA_ARGS__)
#else
# define LOG_UIC(...) do { } while (0)
#endif
static void ppcuic_trigger_irq(PPCUIC *uic)
{
uint32_t ir, cr;
int start, end, inc, i;
/* Trigger interrupt if any is pending */
ir = uic->uicsr & uic->uicer & (~uic->uiccr);
cr = uic->uicsr & uic->uicer & uic->uiccr;
LOG_UIC("%s: uicsr %08" PRIx32 " uicer %08" PRIx32
" uiccr %08" PRIx32 "\n"
" %08" PRIx32 " ir %08" PRIx32 " cr %08" PRIx32 "\n",
__func__, uic->uicsr, uic->uicer, uic->uiccr,
uic->uicsr & uic->uicer, ir, cr);
if (ir != 0x0000000) {
LOG_UIC("Raise UIC interrupt\n");
qemu_irq_raise(uic->output_int);
} else {
LOG_UIC("Lower UIC interrupt\n");
qemu_irq_lower(uic->output_int);
}
/* Trigger critical interrupt if any is pending and update vector */
if (cr != 0x0000000) {
qemu_irq_raise(uic->output_cint);
if (uic->use_vectors) {
/* Compute critical IRQ vector */
if (uic->uicvcr & 1) {
start = 31;
end = 0;
inc = -1;
} else {
start = 0;
end = 31;
inc = 1;
}
uic->uicvr = uic->uicvcr & 0xFFFFFFFC;
for (i = start; i <= end; i += inc) {
if (cr & (1 << i)) {
uic->uicvr += (i - start) * 512 * inc;
break;
}
}
}
LOG_UIC("Raise UIC critical interrupt - "
"vector %08" PRIx32 "\n", uic->uicvr);
} else {
LOG_UIC("Lower UIC critical interrupt\n");
qemu_irq_lower(uic->output_cint);
uic->uicvr = 0x00000000;
}
}
static void ppcuic_set_irq(void *opaque, int irq_num, int level)
{
PPCUIC *uic;
uint32_t mask, sr;
uic = opaque;
mask = 1U << (31 - irq_num);
LOG_UIC("%s: irq %d level %d uicsr %08" PRIx32
" mask %08" PRIx32 " => %08" PRIx32 " %08" PRIx32 "\n",
__func__, irq_num, level,
uic->uicsr, mask, uic->uicsr & mask, level << irq_num);
if (irq_num < 0 || irq_num > 31) {
return;
}
sr = uic->uicsr;
/* Update status register */
if (uic->uictr & mask) {
/* Edge sensitive interrupt */
if (level == 1) {
uic->uicsr |= mask;
}
} else {
/* Level sensitive interrupt */
if (level == 1) {
uic->uicsr |= mask;
uic->level |= mask;
} else {
uic->uicsr &= ~mask;
uic->level &= ~mask;
}
}
LOG_UIC("%s: irq %d level %d sr %" PRIx32 " => "
"%08" PRIx32 "\n", __func__, irq_num, level, uic->uicsr, sr);
if (sr != uic->uicsr) {
ppcuic_trigger_irq(uic);
}
}
static uint32_t dcr_read_uic(void *opaque, int dcrn)
{
PPCUIC *uic;
uint32_t ret;
uic = opaque;
dcrn -= uic->dcr_base;
switch (dcrn) {
case DCR_UICSR:
case DCR_UICSRS:
ret = uic->uicsr;
break;
case DCR_UICER:
ret = uic->uicer;
break;
case DCR_UICCR:
ret = uic->uiccr;
break;
case DCR_UICPR:
ret = uic->uicpr;
break;
case DCR_UICTR:
ret = uic->uictr;
break;
case DCR_UICMSR:
ret = uic->uicsr & uic->uicer;
break;
case DCR_UICVR:
if (!uic->use_vectors) {
goto no_read;
}
ret = uic->uicvr;
break;
case DCR_UICVCR:
if (!uic->use_vectors) {
goto no_read;
}
ret = uic->uicvcr;
break;
default:
no_read:
ret = 0x00000000;
break;
}
return ret;
}
static void dcr_write_uic(void *opaque, int dcrn, uint32_t val)
{
PPCUIC *uic;
uic = opaque;
dcrn -= uic->dcr_base;
LOG_UIC("%s: dcr %d val 0x%x\n", __func__, dcrn, val);
switch (dcrn) {
case DCR_UICSR:
uic->uicsr &= ~val;
uic->uicsr |= uic->level;
ppcuic_trigger_irq(uic);
break;
case DCR_UICSRS:
uic->uicsr |= val;
ppcuic_trigger_irq(uic);
break;
case DCR_UICER:
uic->uicer = val;
ppcuic_trigger_irq(uic);
break;
case DCR_UICCR:
uic->uiccr = val;
ppcuic_trigger_irq(uic);
break;
case DCR_UICPR:
uic->uicpr = val;
break;
case DCR_UICTR:
uic->uictr = val;
ppcuic_trigger_irq(uic);
break;
case DCR_UICMSR:
break;
case DCR_UICVR:
break;
case DCR_UICVCR:
uic->uicvcr = val & 0xFFFFFFFD;
ppcuic_trigger_irq(uic);
break;
}
}
static void ppc_uic_reset(DeviceState *dev)
{
PPCUIC *uic = PPC_UIC(dev);
uic->uiccr = 0x00000000;
uic->uicer = 0x00000000;
uic->uicpr = 0x00000000;
uic->uicsr = 0x00000000;
uic->uictr = 0x00000000;
if (uic->use_vectors) {
uic->uicvcr = 0x00000000;
uic->uicvr = 0x0000000;
}
}
static void ppc_uic_realize(DeviceState *dev, Error **errp)
{
PPCUIC *uic = PPC_UIC(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
PowerPCCPU *cpu;
int i;
if (!uic->cpu) {
/* This is a programming error in the code using this device */
error_setg(errp, "ppc-uic 'cpu' link property was not set");
return;
}
cpu = POWERPC_CPU(uic->cpu);
for (i = 0; i < DCR_UICMAX; i++) {
ppc_dcr_register(&cpu->env, uic->dcr_base + i, uic,
&dcr_read_uic, &dcr_write_uic);
}
sysbus_init_irq(sbd, &uic->output_int);
sysbus_init_irq(sbd, &uic->output_cint);
qdev_init_gpio_in(dev, ppcuic_set_irq, UIC_MAX_IRQ);
}
static Property ppc_uic_properties[] = {
DEFINE_PROP_LINK("cpu", PPCUIC, cpu, TYPE_CPU, CPUState *),
DEFINE_PROP_UINT32("dcr-base", PPCUIC, dcr_base, 0xc0),
DEFINE_PROP_BOOL("use-vectors", PPCUIC, use_vectors, true),
DEFINE_PROP_END_OF_LIST()
};
static const VMStateDescription ppc_uic_vmstate = {
.name = "ppc-uic",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(level, PPCUIC),
VMSTATE_UINT32(uicsr, PPCUIC),
VMSTATE_UINT32(uicer, PPCUIC),
VMSTATE_UINT32(uiccr, PPCUIC),
VMSTATE_UINT32(uicpr, PPCUIC),
VMSTATE_UINT32(uictr, PPCUIC),
VMSTATE_UINT32(uicvcr, PPCUIC),
VMSTATE_UINT32(uicvr, PPCUIC),
VMSTATE_END_OF_LIST()
},
};
static void ppc_uic_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->reset = ppc_uic_reset;
dc->realize = ppc_uic_realize;
dc->vmsd = &ppc_uic_vmstate;
device_class_set_props(dc, ppc_uic_properties);
}
static const TypeInfo ppc_uic_info = {
.name = TYPE_PPC_UIC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(PPCUIC),
.class_init = ppc_uic_class_init,
};
static void ppc_uic_register_types(void)
{
type_register_static(&ppc_uic_info);
}
type_init(ppc_uic_register_types);
