1 /* 2 * Allwinner CPU Configuration Module 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/sysbus.h" 23 #include "migration/vmstate.h" 24 #include "qemu/log.h" 25 #include "qemu/module.h" 26 #include "qemu/error-report.h" 27 #include "qemu/timer.h" 28 #include "hw/core/cpu.h" 29 #include "target/arm/arm-powerctl.h" 30 #include "target/arm/cpu.h" 31 #include "hw/misc/allwinner-cpucfg.h" 32 #include "trace.h" 33 34 /* CPUCFG register offsets */ 35 enum { 36 REG_CPUS_RST_CTRL = 0x0000, /* CPUs Reset Control */ 37 REG_CPU0_RST_CTRL = 0x0040, /* CPU#0 Reset Control */ 38 REG_CPU0_CTRL = 0x0044, /* CPU#0 Control */ 39 REG_CPU0_STATUS = 0x0048, /* CPU#0 Status */ 40 REG_CPU1_RST_CTRL = 0x0080, /* CPU#1 Reset Control */ 41 REG_CPU1_CTRL = 0x0084, /* CPU#1 Control */ 42 REG_CPU1_STATUS = 0x0088, /* CPU#1 Status */ 43 REG_CPU2_RST_CTRL = 0x00C0, /* CPU#2 Reset Control */ 44 REG_CPU2_CTRL = 0x00C4, /* CPU#2 Control */ 45 REG_CPU2_STATUS = 0x00C8, /* CPU#2 Status */ 46 REG_CPU3_RST_CTRL = 0x0100, /* CPU#3 Reset Control */ 47 REG_CPU3_CTRL = 0x0104, /* CPU#3 Control */ 48 REG_CPU3_STATUS = 0x0108, /* CPU#3 Status */ 49 REG_CPU_SYS_RST = 0x0140, /* CPU System Reset */ 50 REG_CLK_GATING = 0x0144, /* CPU Clock Gating */ 51 REG_GEN_CTRL = 0x0184, /* General Control */ 52 REG_SUPER_STANDBY = 0x01A0, /* Super Standby Flag */ 53 REG_ENTRY_ADDR = 0x01A4, /* Reset Entry Address */ 54 REG_DBG_EXTERN = 0x01E4, /* Debug External */ 55 REG_CNT64_CTRL = 0x0280, /* 64-bit Counter Control */ 56 REG_CNT64_LOW = 0x0284, /* 64-bit Counter Low */ 57 REG_CNT64_HIGH = 0x0288, /* 64-bit Counter High */ 58 }; 59 60 /* CPUCFG register flags */ 61 enum { 62 CPUX_RESET_RELEASED = ((1 << 1) | (1 << 0)), 63 CPUX_STATUS_SMP = (1 << 0), 64 CPU_SYS_RESET_RELEASED = (1 << 0), 65 CLK_GATING_ENABLE = ((1 << 8) | 0xF), 66 }; 67 68 /* CPUCFG register reset values */ 69 enum { 70 REG_CLK_GATING_RST = 0x0000010F, 71 REG_GEN_CTRL_RST = 0x00000020, 72 REG_SUPER_STANDBY_RST = 0x0, 73 REG_CNT64_CTRL_RST = 0x0, 74 }; 75 76 /* CPUCFG constants */ 77 enum { 78 CPU_EXCEPTION_LEVEL_ON_RESET = 3, /* EL3 */ 79 }; 80 81 static void allwinner_cpucfg_cpu_reset(AwCpuCfgState *s, uint8_t cpu_id) 82 { 83 int ret; 84 85 trace_allwinner_cpucfg_cpu_reset(cpu_id, s->entry_addr); 86 87 ARMCPU *target_cpu = ARM_CPU(arm_get_cpu_by_id(cpu_id)); 88 if (!target_cpu) { 89 /* 90 * Called with a bogus value for cpu_id. Guest error will 91 * already have been logged, we can simply return here. 92 */ 93 return; 94 } 95 bool target_aa64 = arm_feature(&target_cpu->env, ARM_FEATURE_AARCH64); 96 97 ret = arm_set_cpu_on(cpu_id, s->entry_addr, 0, 98 CPU_EXCEPTION_LEVEL_ON_RESET, target_aa64); 99 if (ret != QEMU_ARM_POWERCTL_RET_SUCCESS) { 100 error_report("%s: failed to bring up CPU %d: err %d", 101 __func__, cpu_id, ret); 102 return; 103 } 104 } 105 106 static uint64_t allwinner_cpucfg_read(void *opaque, hwaddr offset, 107 unsigned size) 108 { 109 const AwCpuCfgState *s = AW_CPUCFG(opaque); 110 uint64_t val = 0; 111 112 switch (offset) { 113 case REG_CPUS_RST_CTRL: /* CPUs Reset Control */ 114 case REG_CPU_SYS_RST: /* CPU System Reset */ 115 val = CPU_SYS_RESET_RELEASED; 116 break; 117 case REG_CPU0_RST_CTRL: /* CPU#0 Reset Control */ 118 case REG_CPU1_RST_CTRL: /* CPU#1 Reset Control */ 119 case REG_CPU2_RST_CTRL: /* CPU#2 Reset Control */ 120 case REG_CPU3_RST_CTRL: /* CPU#3 Reset Control */ 121 val = CPUX_RESET_RELEASED; 122 break; 123 case REG_CPU0_CTRL: /* CPU#0 Control */ 124 case REG_CPU1_CTRL: /* CPU#1 Control */ 125 case REG_CPU2_CTRL: /* CPU#2 Control */ 126 case REG_CPU3_CTRL: /* CPU#3 Control */ 127 val = 0; 128 break; 129 case REG_CPU0_STATUS: /* CPU#0 Status */ 130 case REG_CPU1_STATUS: /* CPU#1 Status */ 131 case REG_CPU2_STATUS: /* CPU#2 Status */ 132 case REG_CPU3_STATUS: /* CPU#3 Status */ 133 val = CPUX_STATUS_SMP; 134 break; 135 case REG_CLK_GATING: /* CPU Clock Gating */ 136 val = CLK_GATING_ENABLE; 137 break; 138 case REG_GEN_CTRL: /* General Control */ 139 val = s->gen_ctrl; 140 break; 141 case REG_SUPER_STANDBY: /* Super Standby Flag */ 142 val = s->super_standby; 143 break; 144 case REG_ENTRY_ADDR: /* Reset Entry Address */ 145 val = s->entry_addr; 146 break; 147 case REG_DBG_EXTERN: /* Debug External */ 148 case REG_CNT64_CTRL: /* 64-bit Counter Control */ 149 case REG_CNT64_LOW: /* 64-bit Counter Low */ 150 case REG_CNT64_HIGH: /* 64-bit Counter High */ 151 qemu_log_mask(LOG_UNIMP, "%s: unimplemented register at 0x%04x\n", 152 __func__, (uint32_t)offset); 153 break; 154 default: 155 qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n", 156 __func__, (uint32_t)offset); 157 break; 158 } 159 160 trace_allwinner_cpucfg_read(offset, val, size); 161 162 return val; 163 } 164 165 static void allwinner_cpucfg_write(void *opaque, hwaddr offset, 166 uint64_t val, unsigned size) 167 { 168 AwCpuCfgState *s = AW_CPUCFG(opaque); 169 170 trace_allwinner_cpucfg_write(offset, val, size); 171 172 switch (offset) { 173 case REG_CPUS_RST_CTRL: /* CPUs Reset Control */ 174 case REG_CPU_SYS_RST: /* CPU System Reset */ 175 break; 176 case REG_CPU0_RST_CTRL: /* CPU#0 Reset Control */ 177 case REG_CPU1_RST_CTRL: /* CPU#1 Reset Control */ 178 case REG_CPU2_RST_CTRL: /* CPU#2 Reset Control */ 179 case REG_CPU3_RST_CTRL: /* CPU#3 Reset Control */ 180 if (val) { 181 allwinner_cpucfg_cpu_reset(s, (offset - REG_CPU0_RST_CTRL) >> 6); 182 } 183 break; 184 case REG_CPU0_CTRL: /* CPU#0 Control */ 185 case REG_CPU1_CTRL: /* CPU#1 Control */ 186 case REG_CPU2_CTRL: /* CPU#2 Control */ 187 case REG_CPU3_CTRL: /* CPU#3 Control */ 188 case REG_CPU0_STATUS: /* CPU#0 Status */ 189 case REG_CPU1_STATUS: /* CPU#1 Status */ 190 case REG_CPU2_STATUS: /* CPU#2 Status */ 191 case REG_CPU3_STATUS: /* CPU#3 Status */ 192 case REG_CLK_GATING: /* CPU Clock Gating */ 193 break; 194 case REG_GEN_CTRL: /* General Control */ 195 s->gen_ctrl = val; 196 break; 197 case REG_SUPER_STANDBY: /* Super Standby Flag */ 198 s->super_standby = val; 199 break; 200 case REG_ENTRY_ADDR: /* Reset Entry Address */ 201 s->entry_addr = val; 202 break; 203 case REG_DBG_EXTERN: /* Debug External */ 204 case REG_CNT64_CTRL: /* 64-bit Counter Control */ 205 case REG_CNT64_LOW: /* 64-bit Counter Low */ 206 case REG_CNT64_HIGH: /* 64-bit Counter High */ 207 qemu_log_mask(LOG_UNIMP, "%s: unimplemented register at 0x%04x\n", 208 __func__, (uint32_t)offset); 209 break; 210 default: 211 qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n", 212 __func__, (uint32_t)offset); 213 break; 214 } 215 } 216 217 static const MemoryRegionOps allwinner_cpucfg_ops = { 218 .read = allwinner_cpucfg_read, 219 .write = allwinner_cpucfg_write, 220 .endianness = DEVICE_NATIVE_ENDIAN, 221 .valid = { 222 .min_access_size = 4, 223 .max_access_size = 4, 224 }, 225 .impl.min_access_size = 4, 226 }; 227 228 static void allwinner_cpucfg_reset(DeviceState *dev) 229 { 230 AwCpuCfgState *s = AW_CPUCFG(dev); 231 232 /* Set default values for registers */ 233 s->gen_ctrl = REG_GEN_CTRL_RST; 234 s->super_standby = REG_SUPER_STANDBY_RST; 235 s->entry_addr = 0; 236 } 237 238 static void allwinner_cpucfg_init(Object *obj) 239 { 240 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 241 AwCpuCfgState *s = AW_CPUCFG(obj); 242 243 /* Memory mapping */ 244 memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_cpucfg_ops, s, 245 TYPE_AW_CPUCFG, 1 * KiB); 246 sysbus_init_mmio(sbd, &s->iomem); 247 } 248 249 static const VMStateDescription allwinner_cpucfg_vmstate = { 250 .name = "allwinner-cpucfg", 251 .version_id = 1, 252 .minimum_version_id = 1, 253 .fields = (const VMStateField[]) { 254 VMSTATE_UINT32(gen_ctrl, AwCpuCfgState), 255 VMSTATE_UINT32(super_standby, AwCpuCfgState), 256 VMSTATE_UINT32(entry_addr, AwCpuCfgState), 257 VMSTATE_END_OF_LIST() 258 } 259 }; 260 261 static void allwinner_cpucfg_class_init(ObjectClass *klass, void *data) 262 { 263 DeviceClass *dc = DEVICE_CLASS(klass); 264 265 device_class_set_legacy_reset(dc, allwinner_cpucfg_reset); 266 dc->vmsd = &allwinner_cpucfg_vmstate; 267 } 268 269 static const TypeInfo allwinner_cpucfg_info = { 270 .name = TYPE_AW_CPUCFG, 271 .parent = TYPE_SYS_BUS_DEVICE, 272 .instance_init = allwinner_cpucfg_init, 273 .instance_size = sizeof(AwCpuCfgState), 274 .class_init = allwinner_cpucfg_class_init, 275 }; 276 277 static void allwinner_cpucfg_register(void) 278 { 279 type_register_static(&allwinner_cpucfg_info); 280 } 281 282 type_init(allwinner_cpucfg_register) 283