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