hw/intc/aspeed_vic.c

   1 /*
   2  * ASPEED Interrupt Controller (New)
   3  *
   4  * Andrew Jeffery <andrew@aj.id.au>
   5  *
   6  * Copyright 2015, 2016 IBM Corp.
   7  *
   8  * This code is licensed under the GPL version 2 or later.  See
   9  * the COPYING file in the top-level directory.
  10  */
  11
  12 /* The hardware exposes two register sets, a legacy set and a 'new' set. The
  13  * model implements the 'new' register set, and logs warnings on accesses to
  14  * the legacy IO space.
  15  *
  16  * The hardware uses 32bit registers to manage 51 IRQs, with low and high
  17  * registers for each conceptual register. The device model's implementation
  18  * uses 64bit data types to store both low and high register values (in the one
  19  * member), but must cope with access offset values in multiples of 4 passed to
  20  * the callbacks. As such the read() and write() implementations process the
  21  * provided offset to understand whether the access is requesting the lower or
  22  * upper 32 bits of the 64bit member.
  23  *
  24  * Additionally, the "Interrupt Enable", "Edge Status" and "Software Interrupt"
  25  * fields have separate "enable"/"status" and "clear" registers, where set bits
  26  * are written to one or the other to change state (avoiding a
  27  * read-modify-write sequence).
  28  */
  29
  30 #include "qemu/osdep.h"
  31 #include "hw/intc/aspeed_vic.h"
  32 #include "hw/irq.h"
  33 #include "migration/vmstate.h"
  34 #include "qemu/bitops.h"
  35 #include "qemu/log.h"
  36 #include "qemu/module.h"
  37 #include "trace.h"
  38
  39 #define AVIC_NEW_BASE_OFFSET 0x80
  40
  41 #define AVIC_L_MASK 0xFFFFFFFFU
  42 #define AVIC_H_MASK 0x0007FFFFU
  43 #define AVIC_EVENT_W_MASK (0x78000ULL << 32)
  44
  45 static void aspeed_vic_update(AspeedVICState *s)
  46 {
  47     uint64_t new = (s->raw & s->enable);
  48     uint64_t flags;
  49
  50     flags = new & s->select;
  51     trace_aspeed_vic_update_fiq(!!flags);
  52     qemu_set_irq(s->fiq, !!flags);
  53
  54     flags = new & ~s->select;
  55     trace_aspeed_vic_update_irq(!!flags);
  56     qemu_set_irq(s->irq, !!flags);
  57 }
  58
  59 static void aspeed_vic_set_irq(void *opaque, int irq, int level)
  60 {
  61     uint64_t irq_mask;
  62     bool raise;
  63     AspeedVICState *s = (AspeedVICState *)opaque;
  64
  65     if (irq > ASPEED_VIC_NR_IRQS) {
  66         qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid interrupt number: %d\n",
  67                       __func__, irq);
  68         return;
  69     }
  70
  71     trace_aspeed_vic_set_irq(irq, level);
  72
  73     irq_mask = BIT(irq);
  74     if (s->sense & irq_mask) {
  75         /* level-triggered */
  76         if (s->event & irq_mask) {
  77             /* high-sensitive */
  78             raise = level;
  79         } else {
  80             /* low-sensitive */
  81             raise = !level;
  82         }
  83         s->raw = deposit64(s->raw, irq, 1, raise);
  84     } else {
  85         uint64_t old_level = s->level & irq_mask;
  86
  87         /* edge-triggered */
  88         if (s->dual_edge & irq_mask) {
  89             raise = (!!old_level) != (!!level);
  90         } else {
  91             if (s->event & irq_mask) {
  92                 /* rising-sensitive */
  93                 raise = !old_level && level;
  94             } else {
  95                 /* falling-sensitive */
  96                 raise = old_level && !level;
  97             }
  98         }
  99         if (raise) {
 100             s->raw = deposit64(s->raw, irq, 1, raise);
 101         }
 102     }
 103     s->level = deposit64(s->level, irq, 1, level);
 104     aspeed_vic_update(s);
 105 }
 106
 107 static uint64_t aspeed_vic_read(void *opaque, hwaddr offset, unsigned size)
 108 {
 109     AspeedVICState *s = (AspeedVICState *)opaque;
 110     hwaddr n_offset;
 111     uint64_t val;
 112     bool high;
 113
 114     if (offset < AVIC_NEW_BASE_OFFSET) {
 115         high = false;
 116         n_offset = offset;
 117     } else {
 118         high = !!(offset & 0x4);
 119         n_offset = (offset & ~0x4);
 120     }
 121
 122     switch (n_offset) {
 123     case 0x80: /* IRQ Status */
 124     case 0x00:
 125         val = s->raw & ~s->select & s->enable;
 126         break;
 127     case 0x88: /* FIQ Status */
 128     case 0x04:
 129         val = s->raw & s->select & s->enable;
 130         break;
 131     case 0x90: /* Raw Interrupt Status */
 132     case 0x08:
 133         val = s->raw;
 134         break;
 135     case 0x98: /* Interrupt Selection */
 136     case 0x0c:
 137         val = s->select;
 138         break;
 139     case 0xa0: /* Interrupt Enable */
 140     case 0x10:
 141         val = s->enable;
 142         break;
 143     case 0xb0: /* Software Interrupt */
 144     case 0x18:
 145         val = s->trigger;
 146         break;
 147     case 0xc0: /* Interrupt Sensitivity */
 148     case 0x24:
 149         val = s->sense;
 150         break;
 151     case 0xc8: /* Interrupt Both Edge Trigger Control */
 152     case 0x28:
 153         val = s->dual_edge;
 154         break;
 155     case 0xd0: /* Interrupt Event */
 156     case 0x2c:
 157         val = s->event;
 158         break;
 159     case 0xe0: /* Edge Triggered Interrupt Status */
 160         val = s->raw & ~s->sense;
 161         break;
 162         /* Illegal */
 163     case 0xa8: /* Interrupt Enable Clear */
 164     case 0xb8: /* Software Interrupt Clear */
 165     case 0xd8: /* Edge Triggered Interrupt Clear */
 166         qemu_log_mask(LOG_GUEST_ERROR,
 167                       "%s: Read of write-only register with offset 0x%"
 168                       HWADDR_PRIx "\n", __func__, offset);
 169         val = 0;
 170         break;
 171     default:
 172         qemu_log_mask(LOG_GUEST_ERROR,
 173                       "%s: Bad register at offset 0x%" HWADDR_PRIx "\n",
 174                       __func__, offset);
 175         val = 0;
 176         break;
 177     }
 178     if (high) {
 179         val = extract64(val, 32, 19);
 180     } else {
 181         val = extract64(val, 0, 32);
 182     }
 183     trace_aspeed_vic_read(offset, size, val);
 184     return val;
 185 }
 186
 187 static void aspeed_vic_write(void *opaque, hwaddr offset, uint64_t data,
 188                              unsigned size)
 189 {
 190     AspeedVICState *s = (AspeedVICState *)opaque;
 191     hwaddr n_offset;
 192     bool high;
 193
 194     if (offset < AVIC_NEW_BASE_OFFSET) {
 195         high = false;
 196         n_offset = offset;
 197     } else {
 198         high = !!(offset & 0x4);
 199         n_offset = (offset & ~0x4);
 200     }
 201
 202     trace_aspeed_vic_write(offset, size, data);
 203
 204     /* Given we have members using separate enable/clear registers, deposit64()
 205      * isn't quite the tool for the job. Instead, relocate the incoming bits to
 206      * the required bit offset based on the provided access address
 207      */
 208     if (high) {
 209         data &= AVIC_H_MASK;
 210         data <<= 32;
 211     } else {
 212         data &= AVIC_L_MASK;
 213     }
 214
 215     switch (n_offset) {
 216     case 0x98: /* Interrupt Selection */
 217     case 0x0c:
 218         /* Register has deposit64() semantics - overwrite requested 32 bits */
 219         if (high) {
 220             s->select &= AVIC_L_MASK;
 221         } else {
 222             s->select &= ((uint64_t) AVIC_H_MASK) << 32;
 223         }
 224         s->select |= data;
 225         break;
 226     case 0xa0: /* Interrupt Enable */
 227     case 0x10:
 228         s->enable |= data;
 229         break;
 230     case 0xa8: /* Interrupt Enable Clear */
 231     case 0x14:
 232         s->enable &= ~data;
 233         break;
 234     case 0xb0: /* Software Interrupt */
 235     case 0x18:
 236         qemu_log_mask(LOG_UNIMP, "%s: Software interrupts unavailable. "
 237                       "IRQs requested: 0x%016" PRIx64 "\n", __func__, data);
 238         break;
 239     case 0xb8: /* Software Interrupt Clear */
 240     case 0x1c:
 241         qemu_log_mask(LOG_UNIMP, "%s: Software interrupts unavailable. "
 242                       "IRQs to be cleared: 0x%016" PRIx64 "\n", __func__, data);
 243         break;
 244     case 0xd0: /* Interrupt Event */
 245         /* Register has deposit64() semantics - overwrite the top four valid
 246          * IRQ bits, as only the top four IRQs (GPIOs) can change their event
 247          * type */
 248         if (high) {
 249             s->event &= ~AVIC_EVENT_W_MASK;
 250             s->event |= (data & AVIC_EVENT_W_MASK);
 251         } else {
 252             qemu_log_mask(LOG_GUEST_ERROR,
 253                           "Ignoring invalid write to interrupt event register");
 254         }
 255         break;
 256     case 0xd8: /* Edge Triggered Interrupt Clear */
 257     case 0x38:
 258         s->raw &= ~(data & ~s->sense);
 259         break;
 260     case 0x80: /* IRQ Status */
 261     case 0x00:
 262     case 0x88: /* FIQ Status */
 263     case 0x04:
 264     case 0x90: /* Raw Interrupt Status */
 265     case 0x08:
 266     case 0xc0: /* Interrupt Sensitivity */
 267     case 0x24:
 268     case 0xc8: /* Interrupt Both Edge Trigger Control */
 269     case 0x28:
 270     case 0xe0: /* Edge Triggered Interrupt Status */
 271         qemu_log_mask(LOG_GUEST_ERROR,
 272                       "%s: Write of read-only register with offset 0x%"
 273                       HWADDR_PRIx "\n", __func__, offset);
 274         break;
 275
 276     default:
 277         qemu_log_mask(LOG_GUEST_ERROR,
 278                       "%s: Bad register at offset 0x%" HWADDR_PRIx "\n",
 279                       __func__, offset);
 280         break;
 281     }
 282     aspeed_vic_update(s);
 283 }
 284
 285 static const MemoryRegionOps aspeed_vic_ops = {
 286     .read = aspeed_vic_read,
 287     .write = aspeed_vic_write,
 288     .endianness = DEVICE_LITTLE_ENDIAN,
 289     .valid.min_access_size = 4,
 290     .valid.max_access_size = 4,
 291     .valid.unaligned = false,
 292 };
 293
 294 static void aspeed_vic_reset(DeviceState *dev)
 295 {
 296     AspeedVICState *s = ASPEED_VIC(dev);
 297
 298     s->level = 0;
 299     s->raw = 0;
 300     s->select = 0;
 301     s->enable = 0;
 302     s->trigger = 0;
 303     s->sense = 0x1F07FFF8FFFFULL;
 304     s->dual_edge = 0xF800070000ULL;
 305     s->event = 0x5F07FFF8FFFFULL;
 306 }
 307
 308 #define AVIC_IO_REGION_SIZE 0x20000
 309
 310 static void aspeed_vic_realize(DeviceState *dev, Error **errp)
 311 {
 312     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 313     AspeedVICState *s = ASPEED_VIC(dev);
 314
 315     memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_vic_ops, s,
 316                           TYPE_ASPEED_VIC, AVIC_IO_REGION_SIZE);
 317
 318     sysbus_init_mmio(sbd, &s->iomem);
 319
 320     qdev_init_gpio_in(dev, aspeed_vic_set_irq, ASPEED_VIC_NR_IRQS);
 321     sysbus_init_irq(sbd, &s->irq);
 322     sysbus_init_irq(sbd, &s->fiq);
 323 }
 324
 325 static const VMStateDescription vmstate_aspeed_vic = {
 326     .name = "aspeed.new-vic",
 327     .version_id = 1,
 328     .minimum_version_id = 1,
 329     .fields = (VMStateField[]) {
 330         VMSTATE_UINT64(level, AspeedVICState),
 331         VMSTATE_UINT64(raw, AspeedVICState),
 332         VMSTATE_UINT64(select, AspeedVICState),
 333         VMSTATE_UINT64(enable, AspeedVICState),
 334         VMSTATE_UINT64(trigger, AspeedVICState),
 335         VMSTATE_UINT64(sense, AspeedVICState),
 336         VMSTATE_UINT64(dual_edge, AspeedVICState),
 337         VMSTATE_UINT64(event, AspeedVICState),
 338         VMSTATE_END_OF_LIST()
 339     }
 340 };
 341
 342 static void aspeed_vic_class_init(ObjectClass *klass, void *data)
 343 {
 344     DeviceClass *dc = DEVICE_CLASS(klass);
 345     dc->realize = aspeed_vic_realize;
 346     dc->reset = aspeed_vic_reset;
 347     dc->desc = "ASPEED Interrupt Controller (New)";
 348     dc->vmsd = &vmstate_aspeed_vic;
 349 }
 350
 351 static const TypeInfo aspeed_vic_info = {
 352     .name = TYPE_ASPEED_VIC,
 353     .parent = TYPE_SYS_BUS_DEVICE,
 354     .instance_size = sizeof(AspeedVICState),
 355     .class_init = aspeed_vic_class_init,
 356 };
 357
 358 static void aspeed_vic_register_types(void)
 359 {
 360     type_register_static(&aspeed_vic_info);
 361 }
 362
 363 type_init(aspeed_vic_register_types);