| 1 | /* |
| 2 | * ARM SBSA Reference Platform Embedded Controller |
| 3 | * |
| 4 | * A device to allow PSCI running in the secure side of sbsa-ref machine |
| 5 | * to communicate platform power states to qemu. |
| 6 | * |
| 7 | * Copyright (c) 2020 Nuvia Inc |
| 8 | * Written by Graeme Gregory <graeme@nuviainc.com> |
| 9 | * |
| 10 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 11 | */ |
| 12 | |
| 13 | #include "qemu/osdep.h" |
| 14 | #include "qemu/log.h" |
| 15 | #include "hw/core/sysbus.h" |
| 16 | #include "system/runstate.h" |
| 17 | |
| 18 | typedef struct SECUREECState { |
| 19 | SysBusDevice parent_obj; |
| 20 | MemoryRegion iomem; |
| 21 | } SECUREECState; |
| 22 | |
| 23 | #define TYPE_SBSA_SECURE_EC "sbsa-ec" |
| 24 | OBJECT_DECLARE_SIMPLE_TYPE(SECUREECState, SBSA_SECURE_EC) |
| 25 | |
| 26 | enum sbsa_ec_powerstates { |
| 27 | SBSA_EC_CMD_POWEROFF = 0x01, |
| 28 | SBSA_EC_CMD_REBOOT = 0x02, |
| 29 | }; |
| 30 | |
| 31 | static uint64_t sbsa_ec_read(void *opaque, hwaddr offset, unsigned size) |
| 32 | { |
| 33 | /* No use for this currently */ |
| 34 | qemu_log_mask(LOG_GUEST_ERROR, "sbsa-ec: no readable registers"); |
| 35 | return 0; |
| 36 | } |
| 37 | |
| 38 | static void sbsa_ec_write(void *opaque, hwaddr offset, |
| 39 | uint64_t value, unsigned size) |
| 40 | { |
| 41 | if (offset == 0) { /* PSCI machine power command register */ |
| 42 | switch (value) { |
| 43 | case SBSA_EC_CMD_POWEROFF: |
| 44 | qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); |
| 45 | break; |
| 46 | case SBSA_EC_CMD_REBOOT: |
| 47 | qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); |
| 48 | break; |
| 49 | default: |
| 50 | qemu_log_mask(LOG_GUEST_ERROR, |
| 51 | "sbsa-ec: unknown power command"); |
| 52 | } |
| 53 | } else { |
| 54 | qemu_log_mask(LOG_GUEST_ERROR, "sbsa-ec: unknown EC register"); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | static const MemoryRegionOps sbsa_ec_ops = { |
| 59 | .read = sbsa_ec_read, |
| 60 | .write = sbsa_ec_write, |
| 61 | .endianness = DEVICE_NATIVE_ENDIAN, |
| 62 | .valid.min_access_size = 4, |
| 63 | .valid.max_access_size = 4, |
| 64 | }; |
| 65 | |
| 66 | static void sbsa_ec_init(Object *obj) |
| 67 | { |
| 68 | SECUREECState *s = SBSA_SECURE_EC(obj); |
| 69 | SysBusDevice *dev = SYS_BUS_DEVICE(obj); |
| 70 | |
| 71 | memory_region_init_io(&s->iomem, obj, &sbsa_ec_ops, s, "sbsa-ec", |
| 72 | 0x1000); |
| 73 | sysbus_init_mmio(dev, &s->iomem); |
| 74 | } |
| 75 | |
| 76 | static void sbsa_ec_class_init(ObjectClass *klass, const void *data) |
| 77 | { |
| 78 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 79 | |
| 80 | /* No vmstate or reset required: device has no internal state */ |
| 81 | dc->user_creatable = false; |
| 82 | } |
| 83 | |
| 84 | static const TypeInfo sbsa_ec_info = { |
| 85 | .name = TYPE_SBSA_SECURE_EC, |
| 86 | .parent = TYPE_SYS_BUS_DEVICE, |
| 87 | .instance_size = sizeof(SECUREECState), |
| 88 | .instance_init = sbsa_ec_init, |
| 89 | .class_init = sbsa_ec_class_init, |
| 90 | }; |
| 91 | |
| 92 | static void sbsa_ec_register_type(void) |
| 93 | { |
| 94 | type_register_static(&sbsa_ec_info); |
| 95 | } |
| 96 | |
| 97 | type_init(sbsa_ec_register_type); |