LXR qemu/hw/intc/grlib

   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
  55OBJECT_DECLARE_SIMPLE_TYPE(IRQMP, GRLIB_IRQMP)
  56
  57typedef struct IRQMPState IRQMPState;
  58
  59struct IRQMP {
  60    SysBusDevice parent_obj;
  61
  62    MemoryRegion iomem;
  63
  64    IRQMPState *state;
  65    qemu_irq irq;
  66};
  67
  68struct 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
  81static 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
 104static 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
 113void 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
 130static 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
 157static 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
 221static 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
 308static 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
 318static 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
 327static 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
 342static 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
 349static 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
 357static void grlib_irqmp_register_types(void)
 358{
 359    type_register_static(&grlib_irqmp_info);
 360}
 361
 362type_init(grlib_irqmp_register_types)
 363