hw/pci-host/dino.c

   1 /*
   2  * HP-PARISC Dino PCI chipset emulation, as in B160L and similar machines
   3  *
   4  * (C) 2017-2019 by Helge Deller <deller@gmx.de>
   5  *
   6  * This work is licensed under the GNU GPL license version 2 or later.
   7  *
   8  * Documentation available at:
   9  * https://parisc.wiki.kernel.org/images-parisc/9/91/Dino_ers.pdf
  10  * https://parisc.wiki.kernel.org/images-parisc/7/70/Dino_3_1_Errata.pdf
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "qemu/module.h"
  15 #include "qemu/units.h"
  16 #include "qapi/error.h"
  17 #include "hw/irq.h"
  18 #include "hw/pci/pci_device.h"
  19 #include "hw/pci/pci_bus.h"
  20 #include "hw/qdev-properties.h"
  21 #include "hw/pci-host/dino.h"
  22 #include "migration/vmstate.h"
  23 #include "trace.h"
  24 #include "qom/object.h"
  25
  26
  27 /*
  28  * Dino can forward memory accesses from the CPU in the range between
  29  * 0xf0800000 and 0xff000000 to the PCI bus.
  30  */
  31 static void gsc_to_pci_forwarding(DinoState *s)
  32 {
  33     uint32_t io_addr_en, tmp;
  34     int enabled, i;
  35
  36     tmp = extract32(s->io_control, 7, 2);
  37     enabled = (tmp == 0x01);
  38     io_addr_en = s->io_addr_en;
  39     /* Mask out first (=firmware) and last (=Dino) areas. */
  40     io_addr_en &= ~(BIT(31) | BIT(0));
  41
  42     memory_region_transaction_begin();
  43     for (i = 1; i < 31; i++) {
  44         MemoryRegion *mem = &s->pci_mem_alias[i];
  45         if (enabled && (io_addr_en & (1U << i))) {
  46             if (!memory_region_is_mapped(mem)) {
  47                 uint32_t addr = 0xf0000000 + i * DINO_MEM_CHUNK_SIZE;
  48                 memory_region_add_subregion(get_system_memory(), addr, mem);
  49             }
  50         } else if (memory_region_is_mapped(mem)) {
  51             memory_region_del_subregion(get_system_memory(), mem);
  52         }
  53     }
  54     memory_region_transaction_commit();
  55 }
  56
  57 static bool dino_chip_mem_valid(void *opaque, hwaddr addr,
  58                                 unsigned size, bool is_write,
  59                                 MemTxAttrs attrs)
  60 {
  61     bool ret = false;
  62
  63     switch (addr) {
  64     case DINO_IAR0:
  65     case DINO_IAR1:
  66     case DINO_IRR0:
  67     case DINO_IRR1:
  68     case DINO_IMR:
  69     case DINO_IPR:
  70     case DINO_ICR:
  71     case DINO_ILR:
  72     case DINO_IO_CONTROL:
  73     case DINO_IO_FBB_EN:
  74     case DINO_IO_ADDR_EN:
  75     case DINO_PCI_IO_DATA:
  76     case DINO_TOC_ADDR:
  77     case DINO_GMASK ... DINO_PCISTS:
  78     case DINO_MLTIM ... DINO_PCIWOR:
  79     case DINO_TLTIM:
  80         ret = true;
  81         break;
  82     case DINO_PCI_IO_DATA + 2:
  83         ret = (size <= 2);
  84         break;
  85     case DINO_PCI_IO_DATA + 1:
  86     case DINO_PCI_IO_DATA + 3:
  87         ret = (size == 1);
  88     }
  89     trace_dino_chip_mem_valid(addr, ret);
  90     return ret;
  91 }
  92
  93 static MemTxResult dino_chip_read_with_attrs(void *opaque, hwaddr addr,
  94                                              uint64_t *data, unsigned size,
  95                                              MemTxAttrs attrs)
  96 {
  97     DinoState *s = opaque;
  98     PCIHostState *phb = PCI_HOST_BRIDGE(s);
  99     MemTxResult ret = MEMTX_OK;
 100     AddressSpace *io;
 101     uint16_t ioaddr;
 102     uint32_t val;
 103
 104     switch (addr) {
 105     case DINO_PCI_IO_DATA ... DINO_PCI_IO_DATA + 3:
 106         /* Read from PCI IO space. */
 107         io = &address_space_io;
 108         ioaddr = phb->config_reg + (addr & 3);
 109         switch (size) {
 110         case 1:
 111             val = address_space_ldub(io, ioaddr, attrs, &ret);
 112             break;
 113         case 2:
 114             val = address_space_lduw_be(io, ioaddr, attrs, &ret);
 115             break;
 116         case 4:
 117             val = address_space_ldl_be(io, ioaddr, attrs, &ret);
 118             break;
 119         default:
 120             g_assert_not_reached();
 121         }
 122         break;
 123
 124     case DINO_IO_FBB_EN:
 125         val = s->io_fbb_en;
 126         break;
 127     case DINO_IO_ADDR_EN:
 128         val = s->io_addr_en;
 129         break;
 130     case DINO_IO_CONTROL:
 131         val = s->io_control;
 132         break;
 133
 134     case DINO_IAR0:
 135         val = s->iar0;
 136         break;
 137     case DINO_IAR1:
 138         val = s->iar1;
 139         break;
 140     case DINO_IMR:
 141         val = s->imr;
 142         break;
 143     case DINO_ICR:
 144         val = s->icr;
 145         break;
 146     case DINO_IPR:
 147         val = s->ipr;
 148         /* Any read to IPR clears the register.  */
 149         s->ipr = 0;
 150         break;
 151     case DINO_ILR:
 152         val = s->ilr;
 153         break;
 154     case DINO_IRR0:
 155         val = s->ilr & s->imr & ~s->icr;
 156         break;
 157     case DINO_IRR1:
 158         val = s->ilr & s->imr & s->icr;
 159         break;
 160     case DINO_TOC_ADDR:
 161         val = s->toc_addr;
 162         break;
 163     case DINO_GMASK ... DINO_TLTIM:
 164         val = s->reg800[(addr - DINO_GMASK) / 4];
 165         if (addr == DINO_PAMR) {
 166             val &= ~0x01;  /* LSB is hardwired to 0 */
 167         }
 168         if (addr == DINO_MLTIM) {
 169             val &= ~0x07;  /* 3 LSB are hardwired to 0 */
 170         }
 171         if (addr == DINO_BRDG_FEAT) {
 172             val &= ~(0x10710E0ul | 8); /* bits 5-7, 24 & 15 reserved */
 173         }
 174         break;
 175
 176     default:
 177         /* Controlled by dino_chip_mem_valid above.  */
 178         g_assert_not_reached();
 179     }
 180
 181     trace_dino_chip_read(addr, val);
 182     *data = val;
 183     return ret;
 184 }
 185
 186 static MemTxResult dino_chip_write_with_attrs(void *opaque, hwaddr addr,
 187                                               uint64_t val, unsigned size,
 188                                               MemTxAttrs attrs)
 189 {
 190     DinoState *s = opaque;
 191     PCIHostState *phb = PCI_HOST_BRIDGE(s);
 192     AddressSpace *io;
 193     MemTxResult ret;
 194     uint16_t ioaddr;
 195     int i;
 196
 197     trace_dino_chip_write(addr, val);
 198
 199     switch (addr) {
 200     case DINO_IO_DATA ... DINO_PCI_IO_DATA + 3:
 201         /* Write into PCI IO space.  */
 202         io = &address_space_io;
 203         ioaddr = phb->config_reg + (addr & 3);
 204         switch (size) {
 205         case 1:
 206             address_space_stb(io, ioaddr, val, attrs, &ret);
 207             break;
 208         case 2:
 209             address_space_stw_be(io, ioaddr, val, attrs, &ret);
 210             break;
 211         case 4:
 212             address_space_stl_be(io, ioaddr, val, attrs, &ret);
 213             break;
 214         default:
 215             g_assert_not_reached();
 216         }
 217         return ret;
 218
 219     case DINO_IO_FBB_EN:
 220         s->io_fbb_en = val & 0x03;
 221         break;
 222     case DINO_IO_ADDR_EN:
 223         s->io_addr_en = val;
 224         gsc_to_pci_forwarding(s);
 225         break;
 226     case DINO_IO_CONTROL:
 227         s->io_control = val;
 228         gsc_to_pci_forwarding(s);
 229         break;
 230
 231     case DINO_IAR0:
 232         s->iar0 = val;
 233         break;
 234     case DINO_IAR1:
 235         s->iar1 = val;
 236         break;
 237     case DINO_IMR:
 238         s->imr = val;
 239         break;
 240     case DINO_ICR:
 241         s->icr = val;
 242         break;
 243     case DINO_IPR:
 244         /* Any write to IPR clears the register.  */
 245         s->ipr = 0;
 246         break;
 247     case DINO_TOC_ADDR:
 248         /* IO_COMMAND of CPU with client_id bits */
 249         s->toc_addr = 0xFFFA0030 | (val & 0x1e000);
 250         break;
 251
 252     case DINO_ILR:
 253     case DINO_IRR0:
 254     case DINO_IRR1:
 255         /* These registers are read-only.  */
 256         break;
 257
 258     case DINO_GMASK ... DINO_TLTIM:
 259         i = (addr - DINO_GMASK) / 4;
 260         val &= reg800_keep_bits[i];
 261         s->reg800[i] = val;
 262         break;
 263
 264     default:
 265         /* Controlled by dino_chip_mem_valid above.  */
 266         g_assert_not_reached();
 267     }
 268     return MEMTX_OK;
 269 }
 270
 271 static const MemoryRegionOps dino_chip_ops = {
 272     .read_with_attrs = dino_chip_read_with_attrs,
 273     .write_with_attrs = dino_chip_write_with_attrs,
 274     .endianness = DEVICE_BIG_ENDIAN,
 275     .valid = {
 276         .min_access_size = 1,
 277         .max_access_size = 4,
 278         .accepts = dino_chip_mem_valid,
 279     },
 280     .impl = {
 281         .min_access_size = 1,
 282         .max_access_size = 4,
 283     },
 284 };
 285
 286 static const VMStateDescription vmstate_dino = {
 287     .name = "Dino",
 288     .version_id = 2,
 289     .minimum_version_id = 1,
 290     .fields = (const VMStateField[]) {
 291         VMSTATE_UINT32(iar0, DinoState),
 292         VMSTATE_UINT32(iar1, DinoState),
 293         VMSTATE_UINT32(imr, DinoState),
 294         VMSTATE_UINT32(ipr, DinoState),
 295         VMSTATE_UINT32(icr, DinoState),
 296         VMSTATE_UINT32(ilr, DinoState),
 297         VMSTATE_UINT32(io_fbb_en, DinoState),
 298         VMSTATE_UINT32(io_addr_en, DinoState),
 299         VMSTATE_UINT32(io_control, DinoState),
 300         VMSTATE_UINT32(toc_addr, DinoState),
 301         VMSTATE_END_OF_LIST()
 302     }
 303 };
 304
 305 /* Unlike pci_config_data_le_ops, no check of high bit set in config_reg.  */
 306
 307 static uint64_t dino_config_data_read(void *opaque, hwaddr addr, unsigned len)
 308 {
 309     PCIHostState *s = opaque;
 310     return pci_data_read(s->bus, s->config_reg | (addr & 3), len);
 311 }
 312
 313 static void dino_config_data_write(void *opaque, hwaddr addr,
 314                                    uint64_t val, unsigned len)
 315 {
 316     PCIHostState *s = opaque;
 317     pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
 318 }
 319
 320 static const MemoryRegionOps dino_config_data_ops = {
 321     .read = dino_config_data_read,
 322     .write = dino_config_data_write,
 323     .endianness = DEVICE_LITTLE_ENDIAN,
 324 };
 325
 326 static uint64_t dino_config_addr_read(void *opaque, hwaddr addr, unsigned len)
 327 {
 328     DinoState *s = opaque;
 329     return s->config_reg_dino;
 330 }
 331
 332 static void dino_config_addr_write(void *opaque, hwaddr addr,
 333                                    uint64_t val, unsigned len)
 334 {
 335     PCIHostState *s = opaque;
 336     DinoState *ds = opaque;
 337     ds->config_reg_dino = val; /* keep a copy of original value */
 338     s->config_reg = val & ~3U;
 339 }
 340
 341 static const MemoryRegionOps dino_config_addr_ops = {
 342     .read = dino_config_addr_read,
 343     .write = dino_config_addr_write,
 344     .valid.min_access_size = 4,
 345     .valid.max_access_size = 4,
 346     .endianness = DEVICE_BIG_ENDIAN,
 347 };
 348
 349 static AddressSpace *dino_pcihost_set_iommu(PCIBus *bus, void *opaque,
 350                                             int devfn)
 351 {
 352     DinoState *s = opaque;
 353
 354     return &s->bm_as;
 355 }
 356
 357 static const PCIIOMMUOps dino_iommu_ops = {
 358     .get_address_space = dino_pcihost_set_iommu,
 359 };
 360
 361 /*
 362  * Dino interrupts are connected as shown on Page 78, Table 23
 363  * (Little-endian bit numbers)
 364  *    0   PCI INTA
 365  *    1   PCI INTB
 366  *    2   PCI INTC
 367  *    3   PCI INTD
 368  *    4   PCI INTE
 369  *    5   PCI INTF
 370  *    6   GSC External Interrupt
 371  *    7   Bus Error for "less than fatal" mode
 372  *    8   PS2
 373  *    9   Unused
 374  *    10  RS232
 375  */
 376
 377 static void dino_set_irq(void *opaque, int irq, int level)
 378 {
 379     DinoState *s = opaque;
 380     uint32_t bit = 1u << irq;
 381     uint32_t old_ilr = s->ilr;
 382
 383     if (level) {
 384         uint32_t ena = bit & ~old_ilr;
 385         s->ipr |= ena;
 386         s->ilr = old_ilr | bit;
 387         if (ena & s->imr) {
 388             uint32_t iar = (ena & s->icr ? s->iar1 : s->iar0);
 389             stl_be_phys(&address_space_memory, iar & -32, iar & 31);
 390         }
 391     } else {
 392         s->ilr = old_ilr & ~bit;
 393     }
 394 }
 395
 396 static int dino_pci_map_irq(PCIDevice *d, int irq_num)
 397 {
 398     int slot = PCI_SLOT(d->devfn);
 399
 400     assert(irq_num >= 0 && irq_num <= 3);
 401
 402     return slot & 0x03;
 403 }
 404
 405 static void dino_pcihost_reset(DeviceState *dev)
 406 {
 407     DinoState *s = DINO_PCI_HOST_BRIDGE(dev);
 408
 409     s->iar0 = s->iar1 = 0xFFFB0000 + 3; /* CPU_HPA + 3 */
 410     s->toc_addr = 0xFFFA0030; /* IO_COMMAND of CPU */
 411 }
 412
 413 static void dino_pcihost_realize(DeviceState *dev, Error **errp)
 414 {
 415     DinoState *s = DINO_PCI_HOST_BRIDGE(dev);
 416
 417     /* Set up PCI view of memory: Bus master address space.  */
 418     memory_region_init(&s->bm, OBJECT(s), "bm-dino", 4 * GiB);
 419     memory_region_init_alias(&s->bm_ram_alias, OBJECT(s),
 420                              "bm-system", s->memory_as, 0,
 421                              0xf0000000 + DINO_MEM_CHUNK_SIZE);
 422     memory_region_init_alias(&s->bm_pci_alias, OBJECT(s),
 423                              "bm-pci", &s->pci_mem,
 424                              0xf0000000 + DINO_MEM_CHUNK_SIZE,
 425                              30 * DINO_MEM_CHUNK_SIZE);
 426     memory_region_init_alias(&s->bm_cpu_alias, OBJECT(s),
 427                              "bm-cpu", s->memory_as, 0xfff00000,
 428                              0xfffff);
 429     memory_region_add_subregion(&s->bm, 0,
 430                                 &s->bm_ram_alias);
 431     memory_region_add_subregion(&s->bm,
 432                                 0xf0000000 + DINO_MEM_CHUNK_SIZE,
 433                                 &s->bm_pci_alias);
 434     memory_region_add_subregion(&s->bm, 0xfff00000,
 435                                 &s->bm_cpu_alias);
 436
 437     address_space_init(&s->bm_as, &s->bm, "pci-bm");
 438 }
 439
 440 static void dino_pcihost_unrealize(DeviceState *dev)
 441 {
 442     DinoState *s = DINO_PCI_HOST_BRIDGE(dev);
 443
 444     address_space_destroy(&s->bm_as);
 445 }
 446
 447 static void dino_pcihost_init(Object *obj)
 448 {
 449     DinoState *s = DINO_PCI_HOST_BRIDGE(obj);
 450     PCIHostState *phb = PCI_HOST_BRIDGE(obj);
 451     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 452     int i;
 453
 454     /* Dino PCI access from main memory.  */
 455     memory_region_init_io(&s->this_mem, OBJECT(s), &dino_chip_ops,
 456                           s, "dino", 4096);
 457
 458     /* Dino PCI config. */
 459     memory_region_init_io(&phb->conf_mem, OBJECT(phb),
 460                           &dino_config_addr_ops, DEVICE(s),
 461                           "pci-conf-idx", 4);
 462     memory_region_init_io(&phb->data_mem, OBJECT(phb),
 463                           &dino_config_data_ops, DEVICE(s),
 464                           "pci-conf-data", 4);
 465     memory_region_add_subregion(&s->this_mem, DINO_PCI_CONFIG_ADDR,
 466                                 &phb->conf_mem);
 467     memory_region_add_subregion(&s->this_mem, DINO_CONFIG_DATA,
 468                                 &phb->data_mem);
 469
 470     /* Dino PCI bus memory.  */
 471     memory_region_init(&s->pci_mem, OBJECT(s), "pci-memory", 4 * GiB);
 472
 473     phb->bus = pci_register_root_bus(DEVICE(s), "pci",
 474                                      dino_set_irq, dino_pci_map_irq, s,
 475                                      &s->pci_mem, get_system_io(),
 476                                      PCI_DEVFN(0, 0), 32, TYPE_PCI_BUS);
 477
 478     /* Set up windows into PCI bus memory.  */
 479     for (i = 1; i < 31; i++) {
 480         uint32_t addr = 0xf0000000 + i * DINO_MEM_CHUNK_SIZE;
 481         char *name = g_strdup_printf("PCI Outbound Window %d", i);
 482         memory_region_init_alias(&s->pci_mem_alias[i], OBJECT(s),
 483                                  name, &s->pci_mem, addr,
 484                                  DINO_MEM_CHUNK_SIZE);
 485         g_free(name);
 486     }
 487
 488     pci_setup_iommu(phb->bus, &dino_iommu_ops, s);
 489
 490     sysbus_init_mmio(sbd, &s->this_mem);
 491
 492     qdev_init_gpio_in(DEVICE(obj), dino_set_irq, DINO_IRQS);
 493 }
 494
 495 static Property dino_pcihost_properties[] = {
 496     DEFINE_PROP_LINK("memory-as", DinoState, memory_as, TYPE_MEMORY_REGION,
 497                      MemoryRegion *),
 498     DEFINE_PROP_END_OF_LIST(),
 499 };
 500
 501 static void dino_pcihost_class_init(ObjectClass *klass, void *data)
 502 {
 503     DeviceClass *dc = DEVICE_CLASS(klass);
 504
 505     device_class_set_legacy_reset(dc, dino_pcihost_reset);
 506     dc->realize = dino_pcihost_realize;
 507     dc->unrealize = dino_pcihost_unrealize;
 508     device_class_set_props(dc, dino_pcihost_properties);
 509     dc->vmsd = &vmstate_dino;
 510 }
 511
 512 static const TypeInfo dino_pcihost_info = {
 513     .name          = TYPE_DINO_PCI_HOST_BRIDGE,
 514     .parent        = TYPE_PCI_HOST_BRIDGE,
 515     .instance_init = dino_pcihost_init,
 516     .instance_size = sizeof(DinoState),
 517     .class_init    = dino_pcihost_class_init,
 518 };
 519
 520 static void dino_register_types(void)
 521 {
 522     type_register_static(&dino_pcihost_info);
 523 }
 524
 525 type_init(dino_register_types)