1 /* 2 * QEMU GRLIB IRQMP Emulator 3 * 4 * (Multiprocessor and extended interrupt not supported) 5 * 6 * Copyright (c) 2010-2011 AdaCore 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a copy 9 * of this software and associated documentation files (the "Software"), to deal 10 * in the Software without restriction, including without limitation the rights 11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 12 * copies of the Software, and to permit persons to whom the Software is 13 * furnished to do so, subject to the following conditions: 14 * 15 * The above copyright notice and this permission notice shall be included in 16 * all copies or substantial portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 24 * THE SOFTWARE. 25 */ 26 27 #include "hw/sysbus.h" 28 #include "cpu.h" 29 30 #include "hw/sparc/grlib.h" 31 32 #include "trace.h" 33 34 #define IRQMP_MAX_CPU 16 35 #define IRQMP_REG_SIZE 256 /* Size of memory mapped registers */ 36 37 /* Memory mapped register offsets */ 38 #define LEVEL_OFFSET 0x00 39 #define PENDING_OFFSET 0x04 40 #define FORCE0_OFFSET 0x08 41 #define CLEAR_OFFSET 0x0C 42 #define MP_STATUS_OFFSET 0x10 43 #define BROADCAST_OFFSET 0x14 44 #define MASK_OFFSET 0x40 45 #define FORCE_OFFSET 0x80 46 #define EXTENDED_OFFSET 0xC0 47 48 typedef struct IRQMPState IRQMPState; 49 50 typedef struct IRQMP { 51 SysBusDevice busdev; 52 MemoryRegion iomem; 53 54 void *set_pil_in; 55 void *set_pil_in_opaque; 56 57 IRQMPState *state; 58 } IRQMP; 59 60 struct IRQMPState { 61 uint32_t level; 62 uint32_t pending; 63 uint32_t clear; 64 uint32_t broadcast; 65 66 uint32_t mask[IRQMP_MAX_CPU]; 67 uint32_t force[IRQMP_MAX_CPU]; 68 uint32_t extended[IRQMP_MAX_CPU]; 69 70 IRQMP *parent; 71 }; 72 73 static void grlib_irqmp_check_irqs(IRQMPState *state) 74 { 75 uint32_t pend = 0; 76 uint32_t level0 = 0; 77 uint32_t level1 = 0; 78 set_pil_in_fn set_pil_in; 79 80 assert(state != NULL); 81 assert(state->parent != NULL); 82 83 /* IRQ for CPU 0 (no SMP support) */ 84 pend = (state->pending | state->force[0]) 85 & state->mask[0]; 86 87 level0 = pend & ~state->level; 88 level1 = pend & state->level; 89 90 trace_grlib_irqmp_check_irqs(state->pending, state->force[0], 91 state->mask[0], level1, level0); 92 93 set_pil_in = (set_pil_in_fn)state->parent->set_pil_in; 94 95 /* Trigger level1 interrupt first and level0 if there is no level1 */ 96 if (level1 != 0) { 97 set_pil_in(state->parent->set_pil_in_opaque, level1); 98 } else { 99 set_pil_in(state->parent->set_pil_in_opaque, level0); 100 } 101 } 102 103 void grlib_irqmp_ack(DeviceState *dev, int intno) 104 { 105 SysBusDevice *sdev; 106 IRQMP *irqmp; 107 IRQMPState *state; 108 uint32_t mask; 109 110 assert(dev != NULL); 111 112 sdev = SYS_BUS_DEVICE(dev); 113 assert(sdev != NULL); 114 115 irqmp = FROM_SYSBUS(typeof(*irqmp), sdev); 116 assert(irqmp != NULL); 117 118 state = irqmp->state; 119 assert(state != NULL); 120 121 intno &= 15; 122 mask = 1 << intno; 123 124 trace_grlib_irqmp_ack(intno); 125 126 /* Clear registers */ 127 state->pending &= ~mask; 128 state->force[0] &= ~mask; /* Only CPU 0 (No SMP support) */ 129 130 grlib_irqmp_check_irqs(state); 131 } 132 133 void grlib_irqmp_set_irq(void *opaque, int irq, int level) 134 { 135 IRQMP *irqmp; 136 IRQMPState *s; 137 int i = 0; 138 139 assert(opaque != NULL); 140 141 irqmp = FROM_SYSBUS(typeof(*irqmp), SYS_BUS_DEVICE(opaque)); 142 assert(irqmp != NULL); 143 144 s = irqmp->state; 145 assert(s != NULL); 146 assert(s->parent != NULL); 147 148 149 if (level) { 150 trace_grlib_irqmp_set_irq(irq); 151 152 if (s->broadcast & 1 << irq) { 153 /* Broadcasted IRQ */ 154 for (i = 0; i < IRQMP_MAX_CPU; i++) { 155 s->force[i] |= 1 << irq; 156 } 157 } else { 158 s->pending |= 1 << irq; 159 } 160 grlib_irqmp_check_irqs(s); 161 162 } 163 } 164 165 static uint64_t grlib_irqmp_read(void *opaque, hwaddr addr, 166 unsigned size) 167 { 168 IRQMP *irqmp = opaque; 169 IRQMPState *state; 170 171 assert(irqmp != NULL); 172 state = irqmp->state; 173 assert(state != NULL); 174 175 addr &= 0xff; 176 177 /* global registers */ 178 switch (addr) { 179 case LEVEL_OFFSET: 180 return state->level; 181 182 case PENDING_OFFSET: 183 return state->pending; 184 185 case FORCE0_OFFSET: 186 /* This register is an "alias" for the force register of CPU 0 */ 187 return state->force[0]; 188 189 case CLEAR_OFFSET: 190 case MP_STATUS_OFFSET: 191 /* Always read as 0 */ 192 return 0; 193 194 case BROADCAST_OFFSET: 195 return state->broadcast; 196 197 default: 198 break; 199 } 200 201 /* mask registers */ 202 if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) { 203 int cpu = (addr - MASK_OFFSET) / 4; 204 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU); 205 206 return state->mask[cpu]; 207 } 208 209 /* force registers */ 210 if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) { 211 int cpu = (addr - FORCE_OFFSET) / 4; 212 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU); 213 214 return state->force[cpu]; 215 } 216 217 /* extended (not supported) */ 218 if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) { 219 int cpu = (addr - EXTENDED_OFFSET) / 4; 220 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU); 221 222 return state->extended[cpu]; 223 } 224 225 trace_grlib_irqmp_readl_unknown(addr); 226 return 0; 227 } 228 229 static void grlib_irqmp_write(void *opaque, hwaddr addr, 230 uint64_t value, unsigned size) 231 { 232 IRQMP *irqmp = opaque; 233 IRQMPState *state; 234 235 assert(irqmp != NULL); 236 state = irqmp->state; 237 assert(state != NULL); 238 239 addr &= 0xff; 240 241 /* global registers */ 242 switch (addr) { 243 case LEVEL_OFFSET: 244 value &= 0xFFFF << 1; /* clean up the value */ 245 state->level = value; 246 return; 247 248 case PENDING_OFFSET: 249 /* Read Only */ 250 return; 251 252 case FORCE0_OFFSET: 253 /* This register is an "alias" for the force register of CPU 0 */ 254 255 value &= 0xFFFE; /* clean up the value */ 256 state->force[0] = value; 257 grlib_irqmp_check_irqs(irqmp->state); 258 return; 259 260 case CLEAR_OFFSET: 261 value &= ~1; /* clean up the value */ 262 state->pending &= ~value; 263 return; 264 265 case MP_STATUS_OFFSET: 266 /* Read Only (no SMP support) */ 267 return; 268 269 case BROADCAST_OFFSET: 270 value &= 0xFFFE; /* clean up the value */ 271 state->broadcast = value; 272 return; 273 274 default: 275 break; 276 } 277 278 /* mask registers */ 279 if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) { 280 int cpu = (addr - MASK_OFFSET) / 4; 281 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU); 282 283 value &= ~1; /* clean up the value */ 284 state->mask[cpu] = value; 285 grlib_irqmp_check_irqs(irqmp->state); 286 return; 287 } 288 289 /* force registers */ 290 if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) { 291 int cpu = (addr - FORCE_OFFSET) / 4; 292 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU); 293 294 uint32_t force = value & 0xFFFE; 295 uint32_t clear = (value >> 16) & 0xFFFE; 296 uint32_t old = state->force[cpu]; 297 298 state->force[cpu] = (old | force) & ~clear; 299 grlib_irqmp_check_irqs(irqmp->state); 300 return; 301 } 302 303 /* extended (not supported) */ 304 if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) { 305 int cpu = (addr - EXTENDED_OFFSET) / 4; 306 assert(cpu >= 0 && cpu < IRQMP_MAX_CPU); 307 308 value &= 0xF; /* clean up the value */ 309 state->extended[cpu] = value; 310 return; 311 } 312 313 trace_grlib_irqmp_writel_unknown(addr, value); 314 } 315 316 static const MemoryRegionOps grlib_irqmp_ops = { 317 .read = grlib_irqmp_read, 318 .write = grlib_irqmp_write, 319 .endianness = DEVICE_NATIVE_ENDIAN, 320 .valid = { 321 .min_access_size = 4, 322 .max_access_size = 4, 323 }, 324 }; 325 326 static void grlib_irqmp_reset(DeviceState *d) 327 { 328 IRQMP *irqmp = container_of(d, IRQMP, busdev.qdev); 329 assert(irqmp != NULL); 330 assert(irqmp->state != NULL); 331 332 memset(irqmp->state, 0, sizeof *irqmp->state); 333 irqmp->state->parent = irqmp; 334 } 335 336 static int grlib_irqmp_init(SysBusDevice *dev) 337 { 338 IRQMP *irqmp = FROM_SYSBUS(typeof(*irqmp), dev); 339 340 assert(irqmp != NULL); 341 342 /* Check parameters */ 343 if (irqmp->set_pil_in == NULL) { 344 return -1; 345 } 346 347 memory_region_init_io(&irqmp->iomem, OBJECT(dev), &grlib_irqmp_ops, irqmp, 348 "irqmp", IRQMP_REG_SIZE); 349 350 irqmp->state = g_malloc0(sizeof *irqmp->state); 351 352 sysbus_init_mmio(dev, &irqmp->iomem); 353 354 return 0; 355 } 356 357 static Property grlib_irqmp_properties[] = { 358 DEFINE_PROP_PTR("set_pil_in", IRQMP, set_pil_in), 359 DEFINE_PROP_PTR("set_pil_in_opaque", IRQMP, set_pil_in_opaque), 360 DEFINE_PROP_END_OF_LIST(), 361 }; 362 363 static void grlib_irqmp_class_init(ObjectClass *klass, void *data) 364 { 365 DeviceClass *dc = DEVICE_CLASS(klass); 366 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); 367 368 k->init = grlib_irqmp_init; 369 dc->reset = grlib_irqmp_reset; 370 dc->props = grlib_irqmp_properties; 371 } 372 373 static const TypeInfo grlib_irqmp_info = { 374 .name = "grlib,irqmp", 375 .parent = TYPE_SYS_BUS_DEVICE, 376 .instance_size = sizeof(IRQMP), 377 .class_init = grlib_irqmp_class_init, 378 }; 379 380 static void grlib_irqmp_register_types(void) 381 { 382 type_register_static(&grlib_irqmp_info); 383 } 384 385 type_init(grlib_irqmp_register_types) 386