hw/pci-host/sabre.c

   1 /*
   2  * QEMU Ultrasparc Sabre PCI host (PBM)
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  * Copyright (c) 2012,2013 Artyom Tarasenko
   6  * Copyright (c) 2018 Mark Cave-Ayland
   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/sysbus.h"
  29 #include "hw/pci/pci.h"
  30 #include "hw/pci/pci_host.h"
  31 #include "hw/qdev-properties.h"
  32 #include "hw/pci/pci_bridge.h"
  33 #include "hw/pci/pci_bus.h"
  34 #include "hw/irq.h"
  35 #include "hw/pci-bridge/simba.h"
  36 #include "hw/pci-host/sabre.h"
  37 #include "qapi/error.h"
  38 #include "qemu/log.h"
  39 #include "qemu/module.h"
  40 #include "sysemu/runstate.h"
  41 #include "trace.h"
  42
  43 /*
  44  * Chipset docs:
  45  * PBM: "UltraSPARC IIi User's Manual",
  46  * https://web.archive.org/web/20030403110020/http://www.sun.com/processors/manuals/805-0087.pdf
  47  */
  48
  49 #define PBM_PCI_IMR_MASK    0x7fffffff
  50 #define PBM_PCI_IMR_ENABLED 0x80000000
  51
  52 #define POR          (1U << 31)
  53 #define SOFT_POR     (1U << 30)
  54 #define SOFT_XIR     (1U << 29)
  55 #define BTN_POR      (1U << 28)
  56 #define BTN_XIR      (1U << 27)
  57 #define RESET_MASK   0xf8000000
  58 #define RESET_WCMASK 0x98000000
  59 #define RESET_WMASK  0x60000000
  60
  61 #define NO_IRQ_REQUEST (MAX_IVEC + 1)
  62
  63 static inline void sabre_set_request(SabreState *s, unsigned int irq_num)
  64 {
  65     trace_sabre_set_request(irq_num);
  66     s->irq_request = irq_num;
  67     qemu_set_irq(s->ivec_irqs[irq_num], 1);
  68 }
  69
  70 static inline void sabre_check_irqs(SabreState *s)
  71 {
  72     unsigned int i;
  73
  74     /* Previous request is not acknowledged, resubmit */
  75     if (s->irq_request != NO_IRQ_REQUEST) {
  76         sabre_set_request(s, s->irq_request);
  77         return;
  78     }
  79     /* no request pending */
  80     if (s->pci_irq_in == 0ULL) {
  81         return;
  82     }
  83     for (i = 0; i < 32; i++) {
  84         if (s->pci_irq_in & (1ULL << i)) {
  85             if (s->pci_irq_map[i >> 2] & PBM_PCI_IMR_ENABLED) {
  86                 sabre_set_request(s, i);
  87                 return;
  88             }
  89         }
  90     }
  91     for (i = 32; i < 64; i++) {
  92         if (s->pci_irq_in & (1ULL << i)) {
  93             if (s->obio_irq_map[i - 32] & PBM_PCI_IMR_ENABLED) {
  94                 sabre_set_request(s, i);
  95                 break;
  96             }
  97         }
  98     }
  99 }
 100
 101 static inline void sabre_clear_request(SabreState *s, unsigned int irq_num)
 102 {
 103     trace_sabre_clear_request(irq_num);
 104     qemu_set_irq(s->ivec_irqs[irq_num], 0);
 105     s->irq_request = NO_IRQ_REQUEST;
 106 }
 107
 108 static AddressSpace *sabre_pci_dma_iommu(PCIBus *bus, void *opaque, int devfn)
 109 {
 110     IOMMUState *is = opaque;
 111
 112     return &is->iommu_as;
 113 }
 114
 115 static void sabre_config_write(void *opaque, hwaddr addr,
 116                                uint64_t val, unsigned size)
 117 {
 118     SabreState *s = opaque;
 119
 120     trace_sabre_config_write(addr, val);
 121
 122     switch (addr) {
 123     case 0x30 ... 0x4f: /* DMA error registers */
 124         /* XXX: not implemented yet */
 125         break;
 126     case 0xc00 ... 0xc3f: /* PCI interrupt control */
 127         if (addr & 4) {
 128             unsigned int ino = (addr & 0x3f) >> 3;
 129             s->pci_irq_map[ino] &= PBM_PCI_IMR_MASK;
 130             s->pci_irq_map[ino] |= val & ~PBM_PCI_IMR_MASK;
 131             if ((s->irq_request == ino) && !(val & ~PBM_PCI_IMR_MASK)) {
 132                 sabre_clear_request(s, ino);
 133             }
 134             sabre_check_irqs(s);
 135         }
 136         break;
 137     case 0x1000 ... 0x107f: /* OBIO interrupt control */
 138         if (addr & 4) {
 139             unsigned int ino = ((addr & 0xff) >> 3);
 140             s->obio_irq_map[ino] &= PBM_PCI_IMR_MASK;
 141             s->obio_irq_map[ino] |= val & ~PBM_PCI_IMR_MASK;
 142             if ((s->irq_request == (ino | 0x20))
 143                  && !(val & ~PBM_PCI_IMR_MASK)) {
 144                 sabre_clear_request(s, ino | 0x20);
 145             }
 146             sabre_check_irqs(s);
 147         }
 148         break;
 149     case 0x1400 ... 0x14ff: /* PCI interrupt clear */
 150         if (addr & 4) {
 151             unsigned int ino = (addr & 0xff) >> 5;
 152             if ((s->irq_request / 4)  == ino) {
 153                 sabre_clear_request(s, s->irq_request);
 154                 sabre_check_irqs(s);
 155             }
 156         }
 157         break;
 158     case 0x1800 ... 0x1860: /* OBIO interrupt clear */
 159         if (addr & 4) {
 160             unsigned int ino = ((addr & 0xff) >> 3) | 0x20;
 161             if (s->irq_request == ino) {
 162                 sabre_clear_request(s, ino);
 163                 sabre_check_irqs(s);
 164             }
 165         }
 166         break;
 167     case 0x2000 ... 0x202f: /* PCI control */
 168         s->pci_control[(addr & 0x3f) >> 2] = val;
 169         break;
 170     case 0xf020 ... 0xf027: /* Reset control */
 171         if (addr & 4) {
 172             val &= RESET_MASK;
 173             s->reset_control &= ~(val & RESET_WCMASK);
 174             s->reset_control |= val & RESET_WMASK;
 175             if (val & SOFT_POR) {
 176                 s->nr_resets = 0;
 177                 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
 178             } else if (val & SOFT_XIR) {
 179                 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
 180             }
 181         }
 182         break;
 183     case 0x5000 ... 0x51cf: /* PIO/DMA diagnostics */
 184     case 0xa400 ... 0xa67f: /* IOMMU diagnostics */
 185     case 0xa800 ... 0xa80f: /* Interrupt diagnostics */
 186     case 0xf000 ... 0xf01f: /* FFB config, memory control */
 187         /* we don't care */
 188     default:
 189         break;
 190     }
 191 }
 192
 193 static uint64_t sabre_config_read(void *opaque,
 194                                   hwaddr addr, unsigned size)
 195 {
 196     SabreState *s = opaque;
 197     uint32_t val = 0;
 198
 199     switch (addr) {
 200     case 0x30 ... 0x4f: /* DMA error registers */
 201         /* XXX: not implemented yet */
 202         break;
 203     case 0xc00 ... 0xc3f: /* PCI interrupt control */
 204         if (addr & 4) {
 205             val = s->pci_irq_map[(addr & 0x3f) >> 3];
 206         }
 207         break;
 208     case 0x1000 ... 0x107f: /* OBIO interrupt control */
 209         if (addr & 4) {
 210             val = s->obio_irq_map[(addr & 0xff) >> 3];
 211         }
 212         break;
 213     case 0x1080 ... 0x108f: /* PCI bus error */
 214         if (addr & 4) {
 215             val = s->pci_err_irq_map[(addr & 0xf) >> 3];
 216         }
 217         break;
 218     case 0x2000 ... 0x202f: /* PCI control */
 219         val = s->pci_control[(addr & 0x3f) >> 2];
 220         break;
 221     case 0xf020 ... 0xf027: /* Reset control */
 222         if (addr & 4) {
 223             val = s->reset_control;
 224         }
 225         break;
 226     case 0x5000 ... 0x51cf: /* PIO/DMA diagnostics */
 227     case 0xa400 ... 0xa67f: /* IOMMU diagnostics */
 228     case 0xa800 ... 0xa80f: /* Interrupt diagnostics */
 229     case 0xf000 ... 0xf01f: /* FFB config, memory control */
 230         /* we don't care */
 231     default:
 232         break;
 233     }
 234     trace_sabre_config_read(addr, val);
 235
 236     return val;
 237 }
 238
 239 static const MemoryRegionOps sabre_config_ops = {
 240     .read = sabre_config_read,
 241     .write = sabre_config_write,
 242     .endianness = DEVICE_BIG_ENDIAN,
 243 };
 244
 245 static void sabre_pci_config_write(void *opaque, hwaddr addr,
 246                                    uint64_t val, unsigned size)
 247 {
 248     SabreState *s = opaque;
 249     PCIHostState *phb = PCI_HOST_BRIDGE(s);
 250
 251     trace_sabre_pci_config_write(addr, val);
 252     pci_data_write(phb->bus, addr, val, size);
 253 }
 254
 255 static uint64_t sabre_pci_config_read(void *opaque, hwaddr addr,
 256                                       unsigned size)
 257 {
 258     uint32_t ret;
 259     SabreState *s = opaque;
 260     PCIHostState *phb = PCI_HOST_BRIDGE(s);
 261
 262     ret = pci_data_read(phb->bus, addr, size);
 263     trace_sabre_pci_config_read(addr, ret);
 264     return ret;
 265 }
 266
 267 /* The sabre host has an IRQ line for each IRQ line of each slot.  */
 268 static int pci_sabre_map_irq(PCIDevice *pci_dev, int irq_num)
 269 {
 270     /* Return the irq as swizzled by the PBM */
 271     return irq_num;
 272 }
 273
 274 static int pci_simbaA_map_irq(PCIDevice *pci_dev, int irq_num)
 275 {
 276     /* The on-board devices have fixed (legacy) OBIO intnos */
 277     switch (PCI_SLOT(pci_dev->devfn)) {
 278     case 1:
 279         /* Onboard NIC */
 280         return OBIO_NIC_IRQ;
 281     case 3:
 282         /* Onboard IDE */
 283         return OBIO_HDD_IRQ;
 284     default:
 285         /* Normal intno, fall through */
 286         break;
 287     }
 288
 289     return ((PCI_SLOT(pci_dev->devfn) << 2) + irq_num) & 0x1f;
 290 }
 291
 292 static int pci_simbaB_map_irq(PCIDevice *pci_dev, int irq_num)
 293 {
 294     return (0x10 + (PCI_SLOT(pci_dev->devfn) << 2) + irq_num) & 0x1f;
 295 }
 296
 297 static void pci_sabre_set_irq(void *opaque, int irq_num, int level)
 298 {
 299     SabreState *s = opaque;
 300
 301     trace_sabre_pci_set_irq(irq_num, level);
 302
 303     /* PCI IRQ map onto the first 32 INO.  */
 304     if (irq_num < 32) {
 305         if (level) {
 306             s->pci_irq_in |= 1ULL << irq_num;
 307             if (s->pci_irq_map[irq_num >> 2] & PBM_PCI_IMR_ENABLED) {
 308                 sabre_set_request(s, irq_num);
 309             }
 310         } else {
 311             s->pci_irq_in &= ~(1ULL << irq_num);
 312         }
 313     } else {
 314         /* OBIO IRQ map onto the next 32 INO.  */
 315         if (level) {
 316             trace_sabre_pci_set_obio_irq(irq_num, level);
 317             s->pci_irq_in |= 1ULL << irq_num;
 318             if ((s->irq_request == NO_IRQ_REQUEST)
 319                 && (s->obio_irq_map[irq_num - 32] & PBM_PCI_IMR_ENABLED)) {
 320                 sabre_set_request(s, irq_num);
 321             }
 322         } else {
 323             s->pci_irq_in &= ~(1ULL << irq_num);
 324         }
 325     }
 326 }
 327
 328 static void sabre_reset(DeviceState *d)
 329 {
 330     SabreState *s = SABRE(d);
 331     PCIDevice *pci_dev;
 332     unsigned int i;
 333     uint16_t cmd;
 334
 335     for (i = 0; i < 8; i++) {
 336         s->pci_irq_map[i] &= PBM_PCI_IMR_MASK;
 337     }
 338     for (i = 0; i < 32; i++) {
 339         s->obio_irq_map[i] &= PBM_PCI_IMR_MASK;
 340     }
 341
 342     s->irq_request = NO_IRQ_REQUEST;
 343     s->pci_irq_in = 0ULL;
 344
 345     if (s->nr_resets++ == 0) {
 346         /* Power on reset */
 347         s->reset_control = POR;
 348     }
 349
 350     /* As this is the busA PCI bridge which contains the on-board devices
 351      * attached to the ebus, ensure that we initially allow IO transactions
 352      * so that we get the early serial console until OpenBIOS can properly
 353      * configure the PCI bridge itself */
 354     pci_dev = PCI_DEVICE(s->bridgeA);
 355     cmd = pci_get_word(pci_dev->config + PCI_COMMAND);
 356     pci_set_word(pci_dev->config + PCI_COMMAND, cmd | PCI_COMMAND_IO);
 357     pci_bridge_update_mappings(PCI_BRIDGE(pci_dev));
 358 }
 359
 360 static const MemoryRegionOps pci_config_ops = {
 361     .read = sabre_pci_config_read,
 362     .write = sabre_pci_config_write,
 363     .endianness = DEVICE_LITTLE_ENDIAN,
 364 };
 365
 366 static void sabre_realize(DeviceState *dev, Error **errp)
 367 {
 368     SabreState *s = SABRE(dev);
 369     PCIHostState *phb = PCI_HOST_BRIDGE(dev);
 370     PCIDevice *pci_dev;
 371
 372     memory_region_init(&s->pci_mmio, OBJECT(s), "pci-mmio", 0x100000000ULL);
 373     memory_region_add_subregion(get_system_memory(), s->mem_base,
 374                                 &s->pci_mmio);
 375
 376     phb->bus = pci_register_root_bus(dev, "pci",
 377                                      pci_sabre_set_irq, pci_sabre_map_irq, s,
 378                                      &s->pci_mmio,
 379                                      &s->pci_ioport,
 380                                      0, 0x40, TYPE_PCI_BUS);
 381
 382     pci_create_simple(phb->bus, 0, TYPE_SABRE_PCI_DEVICE);
 383
 384     /* IOMMU */
 385     memory_region_add_subregion_overlap(&s->sabre_config, 0x200,
 386                     sysbus_mmio_get_region(SYS_BUS_DEVICE(s->iommu), 0), 1);
 387     pci_setup_iommu(phb->bus, sabre_pci_dma_iommu, s->iommu);
 388
 389     /* APB secondary busses */
 390     pci_dev = pci_new_multifunction(PCI_DEVFN(1, 0), true,
 391                                     TYPE_SIMBA_PCI_BRIDGE);
 392     s->bridgeB = PCI_BRIDGE(pci_dev);
 393     pci_bridge_map_irq(s->bridgeB, "pciB", pci_simbaB_map_irq);
 394     pci_realize_and_unref(pci_dev, phb->bus, &error_fatal);
 395
 396     pci_dev = pci_new_multifunction(PCI_DEVFN(1, 1), true,
 397                                     TYPE_SIMBA_PCI_BRIDGE);
 398     s->bridgeA = PCI_BRIDGE(pci_dev);
 399     pci_bridge_map_irq(s->bridgeA, "pciA", pci_simbaA_map_irq);
 400     pci_realize_and_unref(pci_dev, phb->bus, &error_fatal);
 401 }
 402
 403 static void sabre_init(Object *obj)
 404 {
 405     SabreState *s = SABRE(obj);
 406     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 407     unsigned int i;
 408
 409     for (i = 0; i < 8; i++) {
 410         s->pci_irq_map[i] = (0x1f << 6) | (i << 2);
 411     }
 412     for (i = 0; i < 2; i++) {
 413         s->pci_err_irq_map[i] = (0x1f << 6) | 0x30;
 414     }
 415     for (i = 0; i < 32; i++) {
 416         s->obio_irq_map[i] = ((0x1f << 6) | 0x20) + i;
 417     }
 418     qdev_init_gpio_in_named(DEVICE(s), pci_sabre_set_irq, "pbm-irq", MAX_IVEC);
 419     qdev_init_gpio_out_named(DEVICE(s), s->ivec_irqs, "ivec-irq", MAX_IVEC);
 420     s->irq_request = NO_IRQ_REQUEST;
 421     s->pci_irq_in = 0ULL;
 422
 423     /* IOMMU */
 424     object_property_add_link(obj, "iommu", TYPE_SUN4U_IOMMU,
 425                              (Object **) &s->iommu,
 426                              qdev_prop_allow_set_link_before_realize,
 427                              0);
 428
 429     /* sabre_config */
 430     memory_region_init_io(&s->sabre_config, OBJECT(s), &sabre_config_ops, s,
 431                           "sabre-config", 0x10000);
 432     /* at region 0 */
 433     sysbus_init_mmio(sbd, &s->sabre_config);
 434
 435     memory_region_init_io(&s->pci_config, OBJECT(s), &pci_config_ops, s,
 436                           "sabre-pci-config", 0x1000000);
 437     /* at region 1 */
 438     sysbus_init_mmio(sbd, &s->pci_config);
 439
 440     /* pci_ioport */
 441     memory_region_init(&s->pci_ioport, OBJECT(s), "sabre-pci-ioport",
 442                        0x1000000);
 443
 444     /* at region 2 */
 445     sysbus_init_mmio(sbd, &s->pci_ioport);
 446 }
 447
 448 static void sabre_pci_realize(PCIDevice *d, Error **errp)
 449 {
 450     pci_set_word(d->config + PCI_COMMAND,
 451                  PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
 452     pci_set_word(d->config + PCI_STATUS,
 453                  PCI_STATUS_FAST_BACK | PCI_STATUS_66MHZ |
 454                  PCI_STATUS_DEVSEL_MEDIUM);
 455 }
 456
 457 static void sabre_pci_class_init(ObjectClass *klass, void *data)
 458 {
 459     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 460     DeviceClass *dc = DEVICE_CLASS(klass);
 461
 462     k->realize = sabre_pci_realize;
 463     k->vendor_id = PCI_VENDOR_ID_SUN;
 464     k->device_id = PCI_DEVICE_ID_SUN_SABRE;
 465     k->class_id = PCI_CLASS_BRIDGE_HOST;
 466     /*
 467      * PCI-facing part of the host bridge, not usable without the
 468      * host-facing part, which can't be device_add'ed, yet.
 469      */
 470     dc->user_creatable = false;
 471 }
 472
 473 static const TypeInfo sabre_pci_info = {
 474     .name          = TYPE_SABRE_PCI_DEVICE,
 475     .parent        = TYPE_PCI_DEVICE,
 476     .instance_size = sizeof(SabrePCIState),
 477     .class_init    = sabre_pci_class_init,
 478     .interfaces = (InterfaceInfo[]) {
 479         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 480         { },
 481     },
 482 };
 483
 484 static char *sabre_ofw_unit_address(const SysBusDevice *dev)
 485 {
 486     SabreState *s = SABRE(dev);
 487
 488     return g_strdup_printf("%x,%x",
 489                (uint32_t)((s->special_base >> 32) & 0xffffffff),
 490                (uint32_t)(s->special_base & 0xffffffff));
 491 }
 492
 493 static Property sabre_properties[] = {
 494     DEFINE_PROP_UINT64("special-base", SabreState, special_base, 0),
 495     DEFINE_PROP_UINT64("mem-base", SabreState, mem_base, 0),
 496     DEFINE_PROP_END_OF_LIST(),
 497 };
 498
 499 static void sabre_class_init(ObjectClass *klass, void *data)
 500 {
 501     DeviceClass *dc = DEVICE_CLASS(klass);
 502     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(klass);
 503
 504     dc->realize = sabre_realize;
 505     dc->reset = sabre_reset;
 506     device_class_set_props(dc, sabre_properties);
 507     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 508     dc->fw_name = "pci";
 509     sbc->explicit_ofw_unit_address = sabre_ofw_unit_address;
 510 }
 511
 512 static const TypeInfo sabre_info = {
 513     .name          = TYPE_SABRE,
 514     .parent        = TYPE_PCI_HOST_BRIDGE,
 515     .instance_size = sizeof(SabreState),
 516     .instance_init = sabre_init,
 517     .class_init    = sabre_class_init,
 518 };
 519
 520 static void sabre_register_types(void)
 521 {
 522     type_register_static(&sabre_info);
 523     type_register_static(&sabre_pci_info);
 524 }
 525
 526 type_init(sabre_register_types)