hw/grlib_irqmp.c

   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 "sysbus.h"
  28 #include "cpu.h"
  29
  30 #include "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
  53     void *set_pil_in;
  54     void *set_pil_in_opaque;
  55
  56     IRQMPState *state;
  57 } IRQMP;
  58
  59 struct IRQMPState {
  60     uint32_t level;
  61     uint32_t pending;
  62     uint32_t clear;
  63     uint32_t broadcast;
  64
  65     uint32_t mask[IRQMP_MAX_CPU];
  66     uint32_t force[IRQMP_MAX_CPU];
  67     uint32_t extended[IRQMP_MAX_CPU];
  68
  69     IRQMP    *parent;
  70 };
  71
  72 static void grlib_irqmp_check_irqs(IRQMPState *state)
  73 {
  74     uint32_t      pend   = 0;
  75     uint32_t      level0 = 0;
  76     uint32_t      level1 = 0;
  77     set_pil_in_fn set_pil_in;
  78
  79     assert(state != NULL);
  80     assert(state->parent != NULL);
  81
  82     /* IRQ for CPU 0 (no SMP support) */
  83     pend = (state->pending | state->force[0])
  84         & state->mask[0];
  85
  86     level0 = pend & ~state->level;
  87     level1 = pend &  state->level;
  88
  89     trace_grlib_irqmp_check_irqs(state->pending, state->force[0],
  90                                  state->mask[0], level1, level0);
  91
  92     set_pil_in = (set_pil_in_fn)state->parent->set_pil_in;
  93
  94     /* Trigger level1 interrupt first and level0 if there is no level1 */
  95     if (level1 != 0) {
  96         set_pil_in(state->parent->set_pil_in_opaque, level1);
  97     } else {
  98         set_pil_in(state->parent->set_pil_in_opaque, level0);
  99     }
 100 }
 101
 102 void grlib_irqmp_ack(DeviceState *dev, int intno)
 103 {
 104     SysBusDevice *sdev;
 105     IRQMP        *irqmp;
 106     IRQMPState   *state;
 107     uint32_t      mask;
 108
 109     assert(dev != NULL);
 110
 111     sdev = sysbus_from_qdev(dev);
 112     assert(sdev != NULL);
 113
 114     irqmp = FROM_SYSBUS(typeof(*irqmp), sdev);
 115     assert(irqmp != NULL);
 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     /* Clear registers */
 126     state->pending  &= ~mask;
 127     state->force[0] &= ~mask; /* Only CPU 0 (No SMP support) */
 128
 129     grlib_irqmp_check_irqs(state);
 130 }
 131
 132 void grlib_irqmp_set_irq(void *opaque, int irq, int level)
 133 {
 134     IRQMP      *irqmp;
 135     IRQMPState *s;
 136     int         i = 0;
 137
 138     assert(opaque != NULL);
 139
 140     irqmp = FROM_SYSBUS(typeof(*irqmp), sysbus_from_qdev(opaque));
 141     assert(irqmp != NULL);
 142
 143     s = irqmp->state;
 144     assert(s         != NULL);
 145     assert(s->parent != NULL);
 146
 147
 148     if (level) {
 149         trace_grlib_irqmp_set_irq(irq);
 150
 151         if (s->broadcast & 1 << irq) {
 152             /* Broadcasted IRQ */
 153             for (i = 0; i < IRQMP_MAX_CPU; i++) {
 154                 s->force[i] |= 1 << irq;
 155             }
 156         } else {
 157             s->pending |= 1 << irq;
 158         }
 159         grlib_irqmp_check_irqs(s);
 160
 161     }
 162 }
 163
 164 static uint32_t grlib_irqmp_readl(void *opaque, target_phys_addr_t addr)
 165 {
 166     IRQMP      *irqmp = opaque;
 167     IRQMPState *state;
 168
 169     assert(irqmp != NULL);
 170     state = irqmp->state;
 171     assert(state != NULL);
 172
 173     addr &= 0xff;
 174
 175     /* global registers */
 176     switch (addr) {
 177     case LEVEL_OFFSET:
 178         return state->level;
 179
 180     case PENDING_OFFSET:
 181         return state->pending;
 182
 183     case FORCE0_OFFSET:
 184         /* This register is an "alias" for the force register of CPU 0 */
 185         return state->force[0];
 186
 187     case CLEAR_OFFSET:
 188     case MP_STATUS_OFFSET:
 189         /* Always read as 0 */
 190         return 0;
 191
 192     case BROADCAST_OFFSET:
 193         return state->broadcast;
 194
 195     default:
 196         break;
 197     }
 198
 199     /* mask registers */
 200     if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
 201         int cpu = (addr - MASK_OFFSET) / 4;
 202         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
 203
 204         return state->mask[cpu];
 205     }
 206
 207     /* force registers */
 208     if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
 209         int cpu = (addr - FORCE_OFFSET) / 4;
 210         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
 211
 212         return state->force[cpu];
 213     }
 214
 215     /* extended (not supported) */
 216     if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
 217         int cpu = (addr - EXTENDED_OFFSET) / 4;
 218         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
 219
 220         return state->extended[cpu];
 221     }
 222
 223     trace_grlib_irqmp_readl_unknown(addr);
 224     return 0;
 225 }
 226
 227 static void
 228 grlib_irqmp_writel(void *opaque, target_phys_addr_t addr, uint32_t value)
 229 {
 230     IRQMP      *irqmp = opaque;
 231     IRQMPState *state;
 232
 233     assert(irqmp != NULL);
 234     state = irqmp->state;
 235     assert(state != NULL);
 236
 237     addr &= 0xff;
 238
 239     /* global registers */
 240     switch (addr) {
 241     case LEVEL_OFFSET:
 242         value &= 0xFFFF << 1; /* clean up the value */
 243         state->level = value;
 244         return;
 245
 246     case PENDING_OFFSET:
 247         /* Read Only */
 248         return;
 249
 250     case FORCE0_OFFSET:
 251         /* This register is an "alias" for the force register of CPU 0 */
 252
 253         value &= 0xFFFE; /* clean up the value */
 254         state->force[0] = value;
 255         grlib_irqmp_check_irqs(irqmp->state);
 256         return;
 257
 258     case CLEAR_OFFSET:
 259         value &= ~1; /* clean up the value */
 260         state->pending &= ~value;
 261         return;
 262
 263     case MP_STATUS_OFFSET:
 264         /* Read Only (no SMP support) */
 265         return;
 266
 267     case BROADCAST_OFFSET:
 268         value &= 0xFFFE; /* clean up the value */
 269         state->broadcast = value;
 270         return;
 271
 272     default:
 273         break;
 274     }
 275
 276     /* mask registers */
 277     if (addr >= MASK_OFFSET && addr < FORCE_OFFSET) {
 278         int cpu = (addr - MASK_OFFSET) / 4;
 279         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
 280
 281         value &= ~1; /* clean up the value */
 282         state->mask[cpu] = value;
 283         grlib_irqmp_check_irqs(irqmp->state);
 284         return;
 285     }
 286
 287     /* force registers */
 288     if (addr >= FORCE_OFFSET && addr < EXTENDED_OFFSET) {
 289         int cpu = (addr - FORCE_OFFSET) / 4;
 290         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
 291
 292         uint32_t force = value & 0xFFFE;
 293         uint32_t clear = (value >> 16) & 0xFFFE;
 294         uint32_t old   = state->force[cpu];
 295
 296         state->force[cpu] = (old | force) & ~clear;
 297         grlib_irqmp_check_irqs(irqmp->state);
 298         return;
 299     }
 300
 301     /* extended (not supported) */
 302     if (addr >= EXTENDED_OFFSET && addr < IRQMP_REG_SIZE) {
 303         int cpu = (addr - EXTENDED_OFFSET) / 4;
 304         assert(cpu >= 0 && cpu < IRQMP_MAX_CPU);
 305
 306         value &= 0xF; /* clean up the value */
 307         state->extended[cpu] = value;
 308         return;
 309     }
 310
 311     trace_grlib_irqmp_writel_unknown(addr, value);
 312 }
 313
 314 static CPUReadMemoryFunc * const grlib_irqmp_read[] = {
 315     NULL, NULL, &grlib_irqmp_readl,
 316 };
 317
 318 static CPUWriteMemoryFunc * const grlib_irqmp_write[] = {
 319     NULL, NULL, &grlib_irqmp_writel,
 320 };
 321
 322 static void grlib_irqmp_reset(DeviceState *d)
 323 {
 324     IRQMP *irqmp = container_of(d, IRQMP, busdev.qdev);
 325     assert(irqmp        != NULL);
 326     assert(irqmp->state != NULL);
 327
 328     memset(irqmp->state, 0, sizeof *irqmp->state);
 329     irqmp->state->parent = irqmp;
 330 }
 331
 332 static int grlib_irqmp_init(SysBusDevice *dev)
 333 {
 334     IRQMP *irqmp = FROM_SYSBUS(typeof(*irqmp), dev);
 335     int    irqmp_regs;
 336
 337     assert(irqmp != NULL);
 338
 339     /* Check parameters */
 340     if (irqmp->set_pil_in == NULL) {
 341         return -1;
 342     }
 343
 344     irqmp_regs = cpu_register_io_memory(grlib_irqmp_read,
 345                                         grlib_irqmp_write,
 346                                         irqmp, DEVICE_NATIVE_ENDIAN);
 347
 348     irqmp->state = g_malloc0(sizeof *irqmp->state);
 349
 350     if (irqmp_regs < 0) {
 351         return -1;
 352     }
 353
 354     sysbus_init_mmio(dev, IRQMP_REG_SIZE, irqmp_regs);
 355
 356     return 0;
 357 }
 358
 359 static SysBusDeviceInfo grlib_irqmp_info = {
 360     .init = grlib_irqmp_init,
 361     .qdev.name  = "grlib,irqmp",
 362     .qdev.reset = grlib_irqmp_reset,
 363     .qdev.size  = sizeof(IRQMP),
 364     .qdev.props = (Property[]) {
 365         DEFINE_PROP_PTR("set_pil_in", IRQMP, set_pil_in),
 366         DEFINE_PROP_PTR("set_pil_in_opaque", IRQMP, set_pil_in_opaque),
 367         DEFINE_PROP_END_OF_LIST(),
 368     }
 369 };
 370
 371 static void grlib_irqmp_register(void)
 372 {
 373     sysbus_register_withprop(&grlib_irqmp_info);
 374 }
 375
 376 device_init(grlib_irqmp_register)