hw/intc/grlib_irqmp.c

   1 /*
   2  * QEMU GRLIB IRQMP Emulator
   3  *
   4  * (Multiprocessor and extended interrupt not supported)
   5  *
   6  * Copyright (c) 2010-2019 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 "qemu/osdep.h"
  28 #include "hw/irq.h"
  29 #include "hw/sysbus.h"
  30
  31 #include "hw/qdev-properties.h"
  32 #include "hw/sparc/grlib.h"
  33
  34 #include "trace.h"
  35 #include "qapi/error.h"
  36 #include "qemu/module.h"
  37 #include "qom/object.h"
  38
  39 #define IRQMP_MAX_CPU 16
  40 #define IRQMP_REG_SIZE 256      /* Size of memory mapped registers */
  41
  42 /* Memory mapped register offsets */
  43 #define LEVEL_OFFSET     0x00
  44 #define PENDING_OFFSET   0x04
  45 #define FORCE0_OFFSET    0x08
  46 #define CLEAR_OFFSET     0x0C
  47 #define MP_STATUS_OFFSET 0x10
  48 #define BROADCAST_OFFSET 0x14
  49 #define MASK_OFFSET      0x40
  50 #define FORCE_OFFSET     0x80
  51 #define EXTENDED_OFFSET  0xC0
  52
  53 #define MAX_PILS 16
  54
  55 OBJECT_DECLARE_SIMPLE_TYPE(IRQMP, GRLIB_IRQMP)
  56
  57 typedef struct IRQMPState IRQMPState;
  58
  59 struct IRQMP {
  60     SysBusDevice parent_obj;
  61
  62     MemoryRegion iomem;
  63
  64     IRQMPState *state;
  65     qemu_irq irq;
  66 };
  67
  68 struct IRQMPState {
  69     uint32_t level;
  70     uint32_t pending;
  71     uint32_t clear;
  72     uint32_t broadcast;
  73
  74     uint32_t mask[IRQMP_MAX_CPU];
  75     uint32_t force[IRQMP_MAX_CPU];
  76     uint32_t extended[IRQMP_MAX_CPU];
  77
  78     IRQMP    *parent;
  79 };
  80
  81 static void grlib_irqmp_check_irqs(IRQMPState *state)
  82 {
  83     uint32_t      pend   = 0;
  84     uint32_t      level0 = 0;
  85     uint32_t      level1 = 0;
  86
  87     assert(state != NULL);
  88     assert(state->parent != NULL);
  89
  90     /* IRQ for CPU 0 (no SMP support) */
  91     pend = (state->pending | state->force[0])
  92         & state->mask[0];
  93
  94     level0 = pend & ~state->level;
  95     level1 = pend &  state->level;
  96
  97     trace_grlib_irqmp_check_irqs(state->pending, state->force[0],
  98                                  state->mask[0], level1, level0);
  99
 100     /* Trigger level1 interrupt first and level0 if there is no level1 */
 101     qemu_set_irq(state->parent->irq, level1 ?: level0);
 102 }
 103
 104 static void grlib_irqmp_ack_mask(IRQMPState *state, uint32_t mask)
 105 {
 106     /* Clear registers */
 107     state->pending  &= ~mask;
 108     state->force[0] &= ~mask; /* Only CPU 0 (No SMP support) */
 109
 110     grlib_irqmp_check_irqs(state);
 111 }
 112
 113 void grlib_irqmp_ack(DeviceState *dev, int intno)
 114 {
 115     IRQMP        *irqmp = GRLIB_IRQMP(dev);
 116     IRQMPState   *state;
 117     uint32_t      mask;
 118
 119     state = irqmp->state;
 120     assert(state != NULL);
 121
 122     intno &= 15;
 123     mask = 1 << intno;
 124
 125     trace_grlib_irqmp_ack(intno);
 126
 127     grlib_irqmp_ack_mask(state, mask);
 128 }
 129
 130 static void grlib_irqmp_set_irq(void *opaque, int irq, int level)
 131 {
 132     IRQMP      *irqmp = GRLIB_IRQMP(opaque);
 133     IRQMPState *s;
 134     int         i = 0;
 135
 136     s = irqmp->state;
 137     assert(s         != NULL);
 138     assert(s->parent != NULL);
 139
 140
 141     if (level) {
 142         trace_grlib_irqmp_set_irq(irq);
 143
 144         if (s->broadcast & 1 << irq) {
 145             /* Broadcasted IRQ */
 146             for (i = 0; i < IRQMP_MAX_CPU; i++) {
 147                 s->force[i] |= 1 << irq;
 148             }
 149         } else {
 150             s->pending |= 1 << irq;
 151         }
 152         grlib_irqmp_check_irqs(s);
 153
 154     }
 155 }
 156
 157 static uint64_t grlib_irqmp_read(void *opaque, hwaddr addr,
 158                                  unsigned size)
 159 {
 160     IRQMP      *irqmp = opaque;
 161     IRQMPState *state;
 162
 163     assert(irqmp != NULL);
 164     state = irqmp->state;
 165     assert(state != NULL);
 166
 167     addr &= 0xff;
 168
 169     /* global registers */
 170     switch (addr) {
 171     case LEVEL_OFFSET:
 172         return state->level;
 173
 174     case PENDING_OFFSET:
 175         return state->pending;
 176
 177     case FORCE0_OFFSET:
 178         /* This register is an "alias" for the force register of CPU 0 */
 179         return state->force[0];
 180
 181     case CLEAR_OFFSET:
 182     case MP_STATUS_OFFSET:
 183         /* Always read as 0 */
 184         return 0;
 185
 186     case BROADCAST_OFFSET:
 187         return state->broadcast;
 188
 189     default:
 190         break;
 191     }
 192
 193     /* mask registers */
 194     if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
 195         int cpu = (addr - MASK_OFFSET) / 4;
 196         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
 197
 198         return state->mask[cpu];
 199     }
 200
 201     /* force registers */
 202     if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
 203         int cpu = (addr - FORCE_OFFSET) / 4;
 204         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
 205
 206         return state->force[cpu];
 207     }
 208
 209     /* extended (not supported) */
 210     if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
 211         int cpu = (addr - EXTENDED_OFFSET) / 4;
 212         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
 213
 214         return state->extended[cpu];
 215     }
 216
 217     trace_grlib_irqmp_readl_unknown(addr);
 218     return 0;
 219 }
 220
 221 static void grlib_irqmp_write(void *opaque, hwaddr addr,
 222                               uint64_t value, unsigned size)
 223 {
 224     IRQMP      *irqmp = opaque;
 225     IRQMPState *state;
 226
 227     assert(irqmp != NULL);
 228     state = irqmp->state;
 229     assert(state != NULL);
 230
 231     addr &= 0xff;
 232
 233     /* global registers */
 234     switch (addr) {
 235     case LEVEL_OFFSET:
 236         value &= 0xFFFF << 1; /* clean up the value */
 237         state->level = value;
 238         return;
 239
 240     case PENDING_OFFSET:
 241         /* Read Only */
 242         return;
 243
 244     case FORCE0_OFFSET:
 245         /* This register is an "alias" for the force register of CPU 0 */
 246
 247         value &= 0xFFFE; /* clean up the value */
 248         state->force[0] = value;
 249         grlib_irqmp_check_irqs(irqmp->state);
 250         return;
 251
 252     case CLEAR_OFFSET:
 253         value &= ~1; /* clean up the value */
 254         grlib_irqmp_ack_mask(state, value);
 255         return;
 256
 257     case MP_STATUS_OFFSET:
 258         /* Read Only (no SMP support) */
 259         return;
 260
 261     case BROADCAST_OFFSET:
 262         value &= 0xFFFE; /* clean up the value */
 263         state->broadcast = value;
 264         return;
 265
 266     default:
 267         break;
 268     }
 269
 270     /* mask registers */
 271     if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
 272         int cpu = (addr - MASK_OFFSET) / 4;
 273         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
 274
 275         value &= ~1; /* clean up the value */
 276         state->mask[cpu] = value;
 277         grlib_irqmp_check_irqs(irqmp->state);
 278         return;
 279     }
 280
 281     /* force registers */
 282     if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
 283         int cpu = (addr - FORCE_OFFSET) / 4;
 284         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
 285
 286         uint32_t force = value & 0xFFFE;
 287         uint32_t clear = (value >> 16) & 0xFFFE;
 288         uint32_t old   = state->force[cpu];
 289
 290         state->force[cpu] = (old | force) & ~clear;
 291         grlib_irqmp_check_irqs(irqmp->state);
 292         return;
 293     }
 294
 295     /* extended (not supported) */
 296     if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
 297         int cpu = (addr - EXTENDED_OFFSET) / 4;
 298         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
 299
 300         value &= 0xF; /* clean up the value */
 301         state->extended[cpu] = value;
 302         return;
 303     }
 304
 305     trace_grlib_irqmp_writel_unknown(addr, value);
 306 }
 307
 308 static const MemoryRegionOps grlib_irqmp_ops = {
 309     .read = grlib_irqmp_read,
 310     .write = grlib_irqmp_write,
 311     .endianness = DEVICE_NATIVE_ENDIAN,
 312     .valid = {
 313         .min_access_size = 4,
 314         .max_access_size = 4,
 315     },
 316 };
 317
 318 static void grlib_irqmp_reset(DeviceState *d)
 319 {
 320     IRQMP *irqmp = GRLIB_IRQMP(d);
 321     assert(irqmp->state != NULL);
 322
 323     memset(irqmp->state, 0, sizeof *irqmp->state);
 324     irqmp->state->parent = irqmp;
 325 }
 326
 327 static void grlib_irqmp_init(Object *obj)
 328 {
 329     IRQMP *irqmp = GRLIB_IRQMP(obj);
 330     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 331
 332     qdev_init_gpio_in(DEVICE(obj), grlib_irqmp_set_irq, MAX_PILS);
 333     qdev_init_gpio_out_named(DEVICE(obj), &irqmp->irq, "grlib-irq", 1);
 334     memory_region_init_io(&irqmp->iomem, obj, &grlib_irqmp_ops, irqmp,
 335                           "irqmp", IRQMP_REG_SIZE);
 336
 337     irqmp->state = g_malloc0(sizeof *irqmp->state);
 338
 339     sysbus_init_mmio(dev, &irqmp->iomem);
 340 }
 341
 342 static void grlib_irqmp_class_init(ObjectClass *klass, void *data)
 343 {
 344     DeviceClass *dc = DEVICE_CLASS(klass);
 345
 346     dc->reset = grlib_irqmp_reset;
 347 }
 348
 349 static const TypeInfo grlib_irqmp_info = {
 350     .name          = TYPE_GRLIB_IRQMP,
 351     .parent        = TYPE_SYS_BUS_DEVICE,
 352     .instance_size = sizeof(IRQMP),
 353     .instance_init = grlib_irqmp_init,
 354     .class_init    = grlib_irqmp_class_init,
 355 };
 356
 357 static void grlib_irqmp_register_types(void)
 358 {
 359     type_register_static(&grlib_irqmp_info);
 360 }
 361
 362 type_init(grlib_irqmp_register_types)