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