| 1 | /* |
| 2 | * Allwinner Security ID emulation |
| 3 | * |
| 4 | * Copyright (C) 2019 Niek Linnenbank <nieklinnenbank@gmail.com> |
| 5 | * |
| 6 | * This program is free software: you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation, either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #include "qemu/osdep.h" |
| 21 | #include "qemu/units.h" |
| 22 | #include "hw/core/sysbus.h" |
| 23 | #include "migration/vmstate.h" |
| 24 | #include "qemu/log.h" |
| 25 | #include "qemu/module.h" |
| 26 | #include "qemu/guest-random.h" |
| 27 | #include "qapi/error.h" |
| 28 | #include "hw/core/qdev-properties.h" |
| 29 | #include "hw/core/qdev-properties-system.h" |
| 30 | #include "hw/misc/allwinner-sid.h" |
| 31 | #include "trace.h" |
| 32 | |
| 33 | /* SID register offsets */ |
| 34 | enum { |
| 35 | REG_PRCTL = 0x40, /* Control */ |
| 36 | REG_RDKEY = 0x60, /* Read Key */ |
| 37 | }; |
| 38 | |
| 39 | /* SID register flags */ |
| 40 | enum { |
| 41 | REG_PRCTL_WRITE = 0x0002, /* Unknown write flag */ |
| 42 | REG_PRCTL_OP_LOCK = 0xAC00, /* Lock operation */ |
| 43 | }; |
| 44 | |
| 45 | static uint64_t allwinner_sid_read(void *opaque, hwaddr offset, |
| 46 | unsigned size) |
| 47 | { |
| 48 | const AwSidState *s = AW_SID(opaque); |
| 49 | uint64_t val = 0; |
| 50 | |
| 51 | switch (offset) { |
| 52 | case REG_PRCTL: /* Control */ |
| 53 | val = s->control; |
| 54 | break; |
| 55 | case REG_RDKEY: /* Read Key */ |
| 56 | val = s->rdkey; |
| 57 | break; |
| 58 | default: |
| 59 | qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n", |
| 60 | __func__, (uint32_t)offset); |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | trace_allwinner_sid_read(offset, val, size); |
| 65 | |
| 66 | return val; |
| 67 | } |
| 68 | |
| 69 | static void allwinner_sid_write(void *opaque, hwaddr offset, |
| 70 | uint64_t val, unsigned size) |
| 71 | { |
| 72 | AwSidState *s = AW_SID(opaque); |
| 73 | |
| 74 | trace_allwinner_sid_write(offset, val, size); |
| 75 | |
| 76 | switch (offset) { |
| 77 | case REG_PRCTL: /* Control */ |
| 78 | s->control = val; |
| 79 | |
| 80 | if ((s->control & REG_PRCTL_OP_LOCK) && |
| 81 | (s->control & REG_PRCTL_WRITE)) { |
| 82 | uint32_t id = s->control >> 16; |
| 83 | |
| 84 | if (id <= sizeof(QemuUUID) - sizeof(s->rdkey)) { |
| 85 | s->rdkey = ldl_be_p(&s->identifier.data[id]); |
| 86 | } |
| 87 | } |
| 88 | s->control &= ~REG_PRCTL_WRITE; |
| 89 | break; |
| 90 | case REG_RDKEY: /* Read Key */ |
| 91 | break; |
| 92 | default: |
| 93 | qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n", |
| 94 | __func__, (uint32_t)offset); |
| 95 | break; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | static const MemoryRegionOps allwinner_sid_ops = { |
| 100 | .read = allwinner_sid_read, |
| 101 | .write = allwinner_sid_write, |
| 102 | .endianness = DEVICE_LITTLE_ENDIAN, |
| 103 | .valid = { |
| 104 | .min_access_size = 4, |
| 105 | .max_access_size = 4, |
| 106 | }, |
| 107 | .impl.min_access_size = 4, |
| 108 | }; |
| 109 | |
| 110 | static void allwinner_sid_reset(DeviceState *dev) |
| 111 | { |
| 112 | AwSidState *s = AW_SID(dev); |
| 113 | |
| 114 | /* Set default values for registers */ |
| 115 | s->control = 0; |
| 116 | s->rdkey = 0; |
| 117 | } |
| 118 | |
| 119 | static void allwinner_sid_init(Object *obj) |
| 120 | { |
| 121 | SysBusDevice *sbd = SYS_BUS_DEVICE(obj); |
| 122 | AwSidState *s = AW_SID(obj); |
| 123 | |
| 124 | /* Memory mapping */ |
| 125 | memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_sid_ops, s, |
| 126 | TYPE_AW_SID, 1 * KiB); |
| 127 | sysbus_init_mmio(sbd, &s->iomem); |
| 128 | } |
| 129 | |
| 130 | static const Property allwinner_sid_properties[] = { |
| 131 | DEFINE_PROP_UUID_NODEFAULT("identifier", AwSidState, identifier), |
| 132 | }; |
| 133 | |
| 134 | static const VMStateDescription allwinner_sid_vmstate = { |
| 135 | .name = "allwinner-sid", |
| 136 | .version_id = 1, |
| 137 | .minimum_version_id = 1, |
| 138 | .fields = (const VMStateField[]) { |
| 139 | VMSTATE_UINT32(control, AwSidState), |
| 140 | VMSTATE_UINT32(rdkey, AwSidState), |
| 141 | VMSTATE_UINT8_ARRAY_V(identifier.data, AwSidState, sizeof(QemuUUID), 1), |
| 142 | VMSTATE_END_OF_LIST() |
| 143 | } |
| 144 | }; |
| 145 | |
| 146 | static void allwinner_sid_class_init(ObjectClass *klass, const void *data) |
| 147 | { |
| 148 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 149 | |
| 150 | device_class_set_legacy_reset(dc, allwinner_sid_reset); |
| 151 | dc->vmsd = &allwinner_sid_vmstate; |
| 152 | device_class_set_props(dc, allwinner_sid_properties); |
| 153 | } |
| 154 | |
| 155 | static const TypeInfo allwinner_sid_info = { |
| 156 | .name = TYPE_AW_SID, |
| 157 | .parent = TYPE_SYS_BUS_DEVICE, |
| 158 | .instance_init = allwinner_sid_init, |
| 159 | .instance_size = sizeof(AwSidState), |
| 160 | .class_init = allwinner_sid_class_init, |
| 161 | }; |
| 162 | |
| 163 | static void allwinner_sid_register(void) |
| 164 | { |
| 165 | type_register_static(&allwinner_sid_info); |
| 166 | } |
| 167 | |
| 168 | type_init(allwinner_sid_register) |