hw/hppa/dino.c

   1 /*
   2  * HP-PARISC Dino PCI chipset emulation.
   3  *
   4  * (C) 2017 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/units.h"
  15 #include "qapi/error.h"
  16 #include "cpu.h"
  17 #include "hw/hw.h"
  18 #include "hw/devices.h"
  19 #include "sysemu/sysemu.h"
  20 #include "hw/pci/pci.h"
  21 #include "hw/pci/pci_bus.h"
  22 #include "hppa_sys.h"
  23 #include "exec/address-spaces.h"
  24
  25
  26 #define TYPE_DINO_PCI_HOST_BRIDGE "dino-pcihost"
  27
  28 #define DINO_IAR0               0x004
  29 #define DINO_IODC               0x008
  30 #define DINO_IRR0               0x00C  /* RO */
  31 #define DINO_IAR1               0x010
  32 #define DINO_IRR1               0x014  /* RO */
  33 #define DINO_IMR                0x018
  34 #define DINO_IPR                0x01C
  35 #define DINO_TOC_ADDR           0x020
  36 #define DINO_ICR                0x024
  37 #define DINO_ILR                0x028  /* RO */
  38 #define DINO_IO_COMMAND         0x030  /* WO */
  39 #define DINO_IO_STATUS          0x034  /* RO */
  40 #define DINO_IO_CONTROL         0x038
  41 #define DINO_IO_GSC_ERR_RESP    0x040  /* RO */
  42 #define DINO_IO_ERR_INFO        0x044  /* RO */
  43 #define DINO_IO_PCI_ERR_RESP    0x048  /* RO */
  44 #define DINO_IO_FBB_EN          0x05c
  45 #define DINO_IO_ADDR_EN         0x060
  46 #define DINO_PCI_CONFIG_ADDR    0x064
  47 #define DINO_PCI_CONFIG_DATA    0x068
  48 #define DINO_PCI_IO_DATA        0x06c
  49 #define DINO_PCI_MEM_DATA       0x070  /* Dino 3.x only */
  50 #define DINO_GSC2X_CONFIG       0x7b4  /* RO */
  51 #define DINO_GMASK              0x800
  52 #define DINO_PAMR               0x804
  53 #define DINO_PAPR               0x808
  54 #define DINO_DAMODE             0x80c
  55 #define DINO_PCICMD             0x810
  56 #define DINO_PCISTS             0x814  /* R/WC */
  57 #define DINO_MLTIM              0x81c
  58 #define DINO_BRDG_FEAT          0x820
  59 #define DINO_PCIROR             0x824
  60 #define DINO_PCIWOR             0x828
  61 #define DINO_TLTIM              0x830
  62
  63 #define DINO_IRQS         11      /* bits 0-10 are architected */
  64 #define DINO_IRR_MASK     0x5ff   /* only 10 bits are implemented */
  65 #define DINO_LOCAL_IRQS   (DINO_IRQS + 1)
  66 #define DINO_MASK_IRQ(x)  (1 << (x))
  67
  68 #define PCIINTA   0x001
  69 #define PCIINTB   0x002
  70 #define PCIINTC   0x004
  71 #define PCIINTD   0x008
  72 #define PCIINTE   0x010
  73 #define PCIINTF   0x020
  74 #define GSCEXTINT 0x040
  75 /* #define xxx       0x080 - bit 7 is "default" */
  76 /* #define xxx    0x100 - bit 8 not used */
  77 /* #define xxx    0x200 - bit 9 not used */
  78 #define RS232INT  0x400
  79
  80 #define DINO_MEM_CHUNK_SIZE (8 * MiB)
  81
  82 #define DINO_PCI_HOST_BRIDGE(obj) \
  83     OBJECT_CHECK(DinoState, (obj), TYPE_DINO_PCI_HOST_BRIDGE)
  84
  85 typedef struct DinoState {
  86     PCIHostState parent_obj;
  87
  88     /* PCI_CONFIG_ADDR is parent_obj.config_reg, via pci_host_conf_be_ops,
  89        so that we can map PCI_CONFIG_DATA to pci_host_data_be_ops.  */
  90
  91     uint32_t iar0;
  92     uint32_t iar1;
  93     uint32_t imr;
  94     uint32_t ipr;
  95     uint32_t icr;
  96     uint32_t ilr;
  97     uint32_t io_addr_en;
  98     uint32_t io_control;
  99
 100     MemoryRegion this_mem;
 101     MemoryRegion pci_mem;
 102     MemoryRegion pci_mem_alias[32];
 103
 104     AddressSpace bm_as;
 105     MemoryRegion bm;
 106     MemoryRegion bm_ram_alias;
 107     MemoryRegion bm_pci_alias;
 108
 109     MemoryRegion cpu0_eir_mem;
 110 } DinoState;
 111
 112 /*
 113  * Dino can forward memory accesses from the CPU in the range between
 114  * 0xf0800000 and 0xff000000 to the PCI bus.
 115  */
 116 static void gsc_to_pci_forwarding(DinoState *s)
 117 {
 118     uint32_t io_addr_en, tmp;
 119     int enabled, i;
 120
 121     tmp = extract32(s->io_control, 7, 2);
 122     enabled = (tmp == 0x01);
 123     io_addr_en = s->io_addr_en;
 124
 125     memory_region_transaction_begin();
 126     for (i = 1; i < 31; i++) {
 127         MemoryRegion *mem = &s->pci_mem_alias[i];
 128         if (enabled && (io_addr_en & (1U << i))) {
 129             if (!memory_region_is_mapped(mem)) {
 130                 uint32_t addr = 0xf0000000 + i * DINO_MEM_CHUNK_SIZE;
 131                 memory_region_add_subregion(get_system_memory(), addr, mem);
 132             }
 133         } else if (memory_region_is_mapped(mem)) {
 134             memory_region_del_subregion(get_system_memory(), mem);
 135         }
 136     }
 137     memory_region_transaction_commit();
 138 }
 139
 140 static bool dino_chip_mem_valid(void *opaque, hwaddr addr,
 141                                 unsigned size, bool is_write,
 142                                 MemTxAttrs attrs)
 143 {
 144     switch (addr) {
 145     case DINO_IAR0:
 146     case DINO_IAR1:
 147     case DINO_IRR0:
 148     case DINO_IRR1:
 149     case DINO_IMR:
 150     case DINO_IPR:
 151     case DINO_ICR:
 152     case DINO_ILR:
 153     case DINO_IO_CONTROL:
 154     case DINO_IO_ADDR_EN:
 155     case DINO_PCI_IO_DATA:
 156         return true;
 157     case DINO_PCI_IO_DATA + 2:
 158         return size <= 2;
 159     case DINO_PCI_IO_DATA + 1:
 160     case DINO_PCI_IO_DATA + 3:
 161         return size == 1;
 162     }
 163     return false;
 164 }
 165
 166 static MemTxResult dino_chip_read_with_attrs(void *opaque, hwaddr addr,
 167                                              uint64_t *data, unsigned size,
 168                                              MemTxAttrs attrs)
 169 {
 170     DinoState *s = opaque;
 171     MemTxResult ret = MEMTX_OK;
 172     AddressSpace *io;
 173     uint16_t ioaddr;
 174     uint32_t val;
 175
 176     switch (addr) {
 177     case DINO_PCI_IO_DATA ... DINO_PCI_IO_DATA + 3:
 178         /* Read from PCI IO space. */
 179         io = &address_space_io;
 180         ioaddr = s->parent_obj.config_reg;
 181         switch (size) {
 182         case 1:
 183             val = address_space_ldub(io, ioaddr, attrs, &ret);
 184             break;
 185         case 2:
 186             val = address_space_lduw_be(io, ioaddr, attrs, &ret);
 187             break;
 188         case 4:
 189             val = address_space_ldl_be(io, ioaddr, attrs, &ret);
 190             break;
 191         default:
 192             g_assert_not_reached();
 193         }
 194         break;
 195
 196     case DINO_IO_ADDR_EN:
 197         val = s->io_addr_en;
 198         break;
 199     case DINO_IO_CONTROL:
 200         val = s->io_control;
 201         break;
 202
 203     case DINO_IAR0:
 204         val = s->iar0;
 205         break;
 206     case DINO_IAR1:
 207         val = s->iar1;
 208         break;
 209     case DINO_IMR:
 210         val = s->imr;
 211         break;
 212     case DINO_ICR:
 213         val = s->icr;
 214         break;
 215     case DINO_IPR:
 216         val = s->ipr;
 217         /* Any read to IPR clears the register.  */
 218         s->ipr = 0;
 219         break;
 220     case DINO_ILR:
 221         val = s->ilr;
 222         break;
 223     case DINO_IRR0:
 224         val = s->ilr & s->imr & ~s->icr;
 225         break;
 226     case DINO_IRR1:
 227         val = s->ilr & s->imr & s->icr;
 228         break;
 229
 230     default:
 231         /* Controlled by dino_chip_mem_valid above.  */
 232         g_assert_not_reached();
 233     }
 234
 235     *data = val;
 236     return ret;
 237 }
 238
 239 static MemTxResult dino_chip_write_with_attrs(void *opaque, hwaddr addr,
 240                                               uint64_t val, unsigned size,
 241                                               MemTxAttrs attrs)
 242 {
 243     DinoState *s = opaque;
 244     AddressSpace *io;
 245     MemTxResult ret;
 246     uint16_t ioaddr;
 247
 248     switch (addr) {
 249     case DINO_IO_DATA ... DINO_PCI_IO_DATA + 3:
 250         /* Write into PCI IO space.  */
 251         io = &address_space_io;
 252         ioaddr = s->parent_obj.config_reg;
 253         switch (size) {
 254         case 1:
 255             address_space_stb(io, ioaddr, val, attrs, &ret);
 256             break;
 257         case 2:
 258             address_space_stw_be(io, ioaddr, val, attrs, &ret);
 259             break;
 260         case 4:
 261             address_space_stl_be(io, ioaddr, val, attrs, &ret);
 262             break;
 263         default:
 264             g_assert_not_reached();
 265         }
 266         return ret;
 267
 268     case DINO_IO_ADDR_EN:
 269         /* Never allow first (=firmware) and last (=Dino) areas.  */
 270         s->io_addr_en = val & 0x7ffffffe;
 271         gsc_to_pci_forwarding(s);
 272         break;
 273     case DINO_IO_CONTROL:
 274         s->io_control = val;
 275         gsc_to_pci_forwarding(s);
 276         break;
 277
 278     case DINO_IAR0:
 279         s->iar0 = val;
 280         break;
 281     case DINO_IAR1:
 282         s->iar1 = val;
 283         break;
 284     case DINO_IMR:
 285         s->imr = val;
 286         break;
 287     case DINO_ICR:
 288         s->icr = val;
 289         break;
 290     case DINO_IPR:
 291         /* Any write to IPR clears the register.  */
 292         s->ipr = 0;
 293         break;
 294
 295     case DINO_ILR:
 296     case DINO_IRR0:
 297     case DINO_IRR1:
 298         /* These registers are read-only.  */
 299         break;
 300
 301     default:
 302         /* Controlled by dino_chip_mem_valid above.  */
 303         g_assert_not_reached();
 304     }
 305     return MEMTX_OK;
 306 }
 307
 308 static const MemoryRegionOps dino_chip_ops = {
 309     .read_with_attrs = dino_chip_read_with_attrs,
 310     .write_with_attrs = dino_chip_write_with_attrs,
 311     .endianness = DEVICE_BIG_ENDIAN,
 312     .valid = {
 313         .min_access_size = 1,
 314         .max_access_size = 4,
 315         .accepts = dino_chip_mem_valid,
 316     },
 317     .impl = {
 318         .min_access_size = 1,
 319         .max_access_size = 4,
 320     },
 321 };
 322
 323 static const VMStateDescription vmstate_dino = {
 324     .name = "Dino",
 325     .version_id = 1,
 326     .minimum_version_id = 1,
 327     .fields = (VMStateField[]) {
 328         VMSTATE_UINT32(iar0, DinoState),
 329         VMSTATE_UINT32(iar1, DinoState),
 330         VMSTATE_UINT32(imr, DinoState),
 331         VMSTATE_UINT32(ipr, DinoState),
 332         VMSTATE_UINT32(icr, DinoState),
 333         VMSTATE_UINT32(ilr, DinoState),
 334         VMSTATE_UINT32(io_addr_en, DinoState),
 335         VMSTATE_UINT32(io_control, DinoState),
 336         VMSTATE_END_OF_LIST()
 337     }
 338 };
 339
 340
 341 /* Unlike pci_config_data_le_ops, no check of high bit set in config_reg.  */
 342
 343 static uint64_t dino_config_data_read(void *opaque, hwaddr addr, unsigned len)
 344 {
 345     PCIHostState *s = opaque;
 346     return pci_data_read(s->bus, s->config_reg | (addr & 3), len);
 347 }
 348
 349 static void dino_config_data_write(void *opaque, hwaddr addr,
 350                                    uint64_t val, unsigned len)
 351 {
 352     PCIHostState *s = opaque;
 353     pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
 354 }
 355
 356 static const MemoryRegionOps dino_config_data_ops = {
 357     .read = dino_config_data_read,
 358     .write = dino_config_data_write,
 359     .endianness = DEVICE_LITTLE_ENDIAN,
 360 };
 361
 362 static AddressSpace *dino_pcihost_set_iommu(PCIBus *bus, void *opaque,
 363                                             int devfn)
 364 {
 365     DinoState *s = opaque;
 366
 367     return &s->bm_as;
 368 }
 369
 370 /*
 371  * Dino interrupts are connected as shown on Page 78, Table 23
 372  * (Little-endian bit numbers)
 373  *    0   PCI INTA
 374  *    1   PCI INTB
 375  *    2   PCI INTC
 376  *    3   PCI INTD
 377  *    4   PCI INTE
 378  *    5   PCI INTF
 379  *    6   GSC External Interrupt
 380  *    7   Bus Error for "less than fatal" mode
 381  *    8   PS2
 382  *    9   Unused
 383  *    10  RS232
 384  */
 385
 386 static void dino_set_irq(void *opaque, int irq, int level)
 387 {
 388     DinoState *s = opaque;
 389     uint32_t bit = 1u << irq;
 390     uint32_t old_ilr = s->ilr;
 391
 392     if (level) {
 393         uint32_t ena = bit & ~old_ilr;
 394         s->ipr |= ena;
 395         s->ilr = old_ilr | bit;
 396         if (ena & s->imr) {
 397             uint32_t iar = (ena & s->icr ? s->iar1 : s->iar0);
 398             stl_be_phys(&address_space_memory, iar & -32, iar & 31);
 399         }
 400     } else {
 401         s->ilr = old_ilr & ~bit;
 402     }
 403 }
 404
 405 static int dino_pci_map_irq(PCIDevice *d, int irq_num)
 406 {
 407     int slot = d->devfn >> 3;
 408
 409     assert(irq_num >= 0 && irq_num <= 3);
 410
 411     return slot & 0x03;
 412 }
 413
 414 static void dino_set_timer_irq(void *opaque, int irq, int level)
 415 {
 416     /* ??? Not connected.  */
 417 }
 418
 419 static void dino_set_serial_irq(void *opaque, int irq, int level)
 420 {
 421     dino_set_irq(opaque, 10, level);
 422 }
 423
 424 PCIBus *dino_init(MemoryRegion *addr_space,
 425                   qemu_irq *p_rtc_irq, qemu_irq *p_ser_irq)
 426 {
 427     DeviceState *dev;
 428     DinoState *s;
 429     PCIBus *b;
 430     int i;
 431
 432     dev = qdev_create(NULL, TYPE_DINO_PCI_HOST_BRIDGE);
 433     s = DINO_PCI_HOST_BRIDGE(dev);
 434
 435     /* Dino PCI access from main memory.  */
 436     memory_region_init_io(&s->this_mem, OBJECT(s), &dino_chip_ops,
 437                           s, "dino", 4096);
 438     memory_region_add_subregion(addr_space, DINO_HPA, &s->this_mem);
 439
 440     /* Dino PCI config. */
 441     memory_region_init_io(&s->parent_obj.conf_mem, OBJECT(&s->parent_obj),
 442                           &pci_host_conf_be_ops, dev, "pci-conf-idx", 4);
 443     memory_region_init_io(&s->parent_obj.data_mem, OBJECT(&s->parent_obj),
 444                           &dino_config_data_ops, dev, "pci-conf-data", 4);
 445     memory_region_add_subregion(&s->this_mem, DINO_PCI_CONFIG_ADDR,
 446                                 &s->parent_obj.conf_mem);
 447     memory_region_add_subregion(&s->this_mem, DINO_CONFIG_DATA,
 448                                 &s->parent_obj.data_mem);
 449
 450     /* Dino PCI bus memory.  */
 451     memory_region_init(&s->pci_mem, OBJECT(s), "pci-memory", 1ull << 32);
 452
 453     b = pci_register_root_bus(dev, "pci", dino_set_irq, dino_pci_map_irq, s,
 454                               &s->pci_mem, get_system_io(),
 455                               PCI_DEVFN(0, 0), 32, TYPE_PCI_BUS);
 456     s->parent_obj.bus = b;
 457     qdev_init_nofail(dev);
 458
 459     /* Set up windows into PCI bus memory.  */
 460     for (i = 1; i < 31; i++) {
 461         uint32_t addr = 0xf0000000 + i * DINO_MEM_CHUNK_SIZE;
 462         char *name = g_strdup_printf("PCI Outbound Window %d", i);
 463         memory_region_init_alias(&s->pci_mem_alias[i], OBJECT(s),
 464                                  name, &s->pci_mem, addr,
 465                                  DINO_MEM_CHUNK_SIZE);
 466     }
 467
 468     /* Set up PCI view of memory: Bus master address space.  */
 469     memory_region_init(&s->bm, OBJECT(s), "bm-dino", 1ull << 32);
 470     memory_region_init_alias(&s->bm_ram_alias, OBJECT(s),
 471                              "bm-system", addr_space, 0,
 472                              0xf0000000 + DINO_MEM_CHUNK_SIZE);
 473     memory_region_init_alias(&s->bm_pci_alias, OBJECT(s),
 474                              "bm-pci", &s->pci_mem,
 475                              0xf0000000 + DINO_MEM_CHUNK_SIZE,
 476                              31 * DINO_MEM_CHUNK_SIZE);
 477     memory_region_add_subregion(&s->bm, 0,
 478                                 &s->bm_ram_alias);
 479     memory_region_add_subregion(&s->bm,
 480                                 0xf0000000 + DINO_MEM_CHUNK_SIZE,
 481                                 &s->bm_pci_alias);
 482     address_space_init(&s->bm_as, &s->bm, "pci-bm");
 483     pci_setup_iommu(b, dino_pcihost_set_iommu, s);
 484
 485     *p_rtc_irq = qemu_allocate_irq(dino_set_timer_irq, s, 0);
 486     *p_ser_irq = qemu_allocate_irq(dino_set_serial_irq, s, 0);
 487
 488     return b;
 489 }
 490
 491 static int dino_pcihost_init(SysBusDevice *dev)
 492 {
 493     return 0;
 494 }
 495
 496 static void dino_pcihost_class_init(ObjectClass *klass, void *data)
 497 {
 498     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 499     DeviceClass *dc = DEVICE_CLASS(klass);
 500
 501     k->init = dino_pcihost_init;
 502     dc->vmsd = &vmstate_dino;
 503 }
 504
 505 static const TypeInfo dino_pcihost_info = {
 506     .name          = TYPE_DINO_PCI_HOST_BRIDGE,
 507     .parent        = TYPE_PCI_HOST_BRIDGE,
 508     .instance_size = sizeof(DinoState),
 509     .class_init    = dino_pcihost_class_init,
 510 };
 511
 512 static void dino_register_types(void)
 513 {
 514     type_register_static(&dino_pcihost_info);
 515 }
 516
 517 type_init(dino_register_types)