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/*
* Cluster Power Controller emulation
*
* Copyright (c) 2016 Imagination Technologies
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "cpu.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "hw/sysbus.h"
#include "hw/misc/mips_cpc.h"
static inline uint64_t cpc_vp_run_mask(MIPSCPCState *cpc)
{
return (1ULL << cpc->num_vp) - 1;
}
static void mips_cpu_reset_async_work(CPUState *cs, run_on_cpu_data data)
{
MIPSCPCState *cpc = (MIPSCPCState *) data.host_ptr;
cpu_reset(cs);
cpc->vp_running |= 1ULL << cs->cpu_index;
}
static void cpc_run_vp(MIPSCPCState *cpc, uint64_t vp_run)
{
CPUState *cs = first_cpu;
CPU_FOREACH(cs) {
uint64_t i = 1ULL << cs->cpu_index;
if (i & vp_run & ~cpc->vp_running) {
/*
* To avoid racing with a CPU we are just kicking off.
* We do the final bit of preparation for the work in
* the target CPUs context.
*/
async_safe_run_on_cpu(cs, mips_cpu_reset_async_work,
RUN_ON_CPU_HOST_PTR(cpc));
}
}
}
static void cpc_stop_vp(MIPSCPCState *cpc, uint64_t vp_stop)
{
CPUState *cs = first_cpu;
CPU_FOREACH(cs) {
uint64_t i = 1ULL << cs->cpu_index;
if (i & vp_stop & cpc->vp_running) {
cpu_interrupt(cs, CPU_INTERRUPT_HALT);
cpc->vp_running &= ~i;
}
}
}
static void cpc_write(void *opaque, hwaddr offset, uint64_t data,
unsigned size)
{
MIPSCPCState *s = opaque;
switch (offset) {
case CPC_CL_BASE_OFS + CPC_VP_RUN_OFS:
case CPC_CO_BASE_OFS + CPC_VP_RUN_OFS:
cpc_run_vp(s, data & cpc_vp_run_mask(s));
break;
case CPC_CL_BASE_OFS + CPC_VP_STOP_OFS:
case CPC_CO_BASE_OFS + CPC_VP_STOP_OFS:
cpc_stop_vp(s, data & cpc_vp_run_mask(s));
break;
default:
qemu_log_mask(LOG_UNIMP,
"%s: Bad offset 0x%x\n", __func__, (int)offset);
break;
}
return;
}
static uint64_t cpc_read(void *opaque, hwaddr offset, unsigned size)
{
MIPSCPCState *s = opaque;
switch (offset) {
case CPC_CL_BASE_OFS + CPC_VP_RUNNING_OFS:
case CPC_CO_BASE_OFS + CPC_VP_RUNNING_OFS:
return s->vp_running;
default:
qemu_log_mask(LOG_UNIMP,
"%s: Bad offset 0x%x\n", __func__, (int)offset);
return 0;
}
}
static const MemoryRegionOps cpc_ops = {
.read = cpc_read,
.write = cpc_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl = {
.max_access_size = 8,
},
};
static void mips_cpc_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
MIPSCPCState *s = MIPS_CPC(obj);
memory_region_init_io(&s->mr, OBJECT(s), &cpc_ops, s, "mips-cpc",
CPC_ADDRSPACE_SZ);
sysbus_init_mmio(sbd, &s->mr);
}
static void mips_cpc_realize(DeviceState *dev, Error **errp)
{
MIPSCPCState *s = MIPS_CPC(dev);
if (s->vp_start_running > cpc_vp_run_mask(s)) {
error_setg(errp,
"incorrect vp_start_running 0x%" PRIx64 " for num_vp = %d",
s->vp_running, s->num_vp);
return;
}
}
static void mips_cpc_reset(DeviceState *dev)
{
MIPSCPCState *s = MIPS_CPC(dev);
/* Reflect the fact that all VPs are halted on reset */
s->vp_running = 0;
/* Put selected VPs into run state */
cpc_run_vp(s, s->vp_start_running);
}
static const VMStateDescription vmstate_mips_cpc = {
.name = "mips-cpc",
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_UINT64(vp_running, MIPSCPCState),
VMSTATE_END_OF_LIST()
},
};
static Property mips_cpc_properties[] = {
DEFINE_PROP_UINT32("num-vp", MIPSCPCState, num_vp, 0x1),
DEFINE_PROP_UINT64("vp-start-running", MIPSCPCState, vp_start_running, 0x1),
DEFINE_PROP_END_OF_LIST(),
};
static void mips_cpc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = mips_cpc_realize;
dc->reset = mips_cpc_reset;
dc->vmsd = &vmstate_mips_cpc;
dc->props = mips_cpc_properties;
}
static const TypeInfo mips_cpc_info = {
.name = TYPE_MIPS_CPC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(MIPSCPCState),
.instance_init = mips_cpc_init,
.class_init = mips_cpc_class_init,
};
static void mips_cpc_register_types(void)
{
type_register_static(&mips_cpc_info);
}
type_init(mips_cpc_register_types)
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