diff options
Diffstat (limited to 'qemu/hw/misc/mips_cpc.c')
| -rw-r--r-- | qemu/hw/misc/mips_cpc.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/qemu/hw/misc/mips_cpc.c b/qemu/hw/misc/mips_cpc.c new file mode 100644 index 000000000..d2b8e42da --- /dev/null +++ b/qemu/hw/misc/mips_cpc.c @@ -0,0 +1,177 @@ +/* + * 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 "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 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) { + cpu_interrupt(cs, CPU_INTERRUPT_WAKE); + cpc->vp_running |= i; + } + } +} + +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) { + cs->halted = 1; + cpu_reset_interrupt(cs, CPU_INTERRUPT_WAKE); + 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) |