hw/scsi/esp-pci.c

   1 /*
   2  * QEMU ESP/NCR53C9x emulation
   3  *
   4  * Copyright (c) 2005-2006 Fabrice Bellard
   5  * Copyright (c) 2012 Herve Poussineau
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include "qemu/osdep.h"
  27 #include "hw/pci/pci.h"
  28 #include "hw/irq.h"
  29 #include "hw/nvram/eeprom93xx.h"
  30 #include "hw/scsi/esp.h"
  31 #include "migration/vmstate.h"
  32 #include "trace.h"
  33 #include "qapi/error.h"
  34 #include "qemu/log.h"
  35 #include "qemu/module.h"
  36 #include "qom/object.h"
  37
  38 #define TYPE_AM53C974_DEVICE "am53c974"
  39
  40 typedef struct PCIESPState PCIESPState;
  41 DECLARE_INSTANCE_CHECKER(PCIESPState, PCI_ESP,
  42                          TYPE_AM53C974_DEVICE)
  43
  44 #define DMA_CMD   0x0
  45 #define DMA_STC   0x1
  46 #define DMA_SPA   0x2
  47 #define DMA_WBC   0x3
  48 #define DMA_WAC   0x4
  49 #define DMA_STAT  0x5
  50 #define DMA_SMDLA 0x6
  51 #define DMA_WMAC  0x7
  52
  53 #define DMA_CMD_MASK   0x03
  54 #define DMA_CMD_DIAG   0x04
  55 #define DMA_CMD_MDL    0x10
  56 #define DMA_CMD_INTE_P 0x20
  57 #define DMA_CMD_INTE_D 0x40
  58 #define DMA_CMD_DIR    0x80
  59
  60 #define DMA_STAT_PWDN    0x01
  61 #define DMA_STAT_ERROR   0x02
  62 #define DMA_STAT_ABORT   0x04
  63 #define DMA_STAT_DONE    0x08
  64 #define DMA_STAT_SCSIINT 0x10
  65 #define DMA_STAT_BCMBLT  0x20
  66
  67 #define SBAC_STATUS (1 << 24)
  68
  69 struct PCIESPState {
  70     /*< private >*/
  71     PCIDevice parent_obj;
  72     /*< public >*/
  73
  74     MemoryRegion io;
  75     uint32_t dma_regs[8];
  76     uint32_t sbac;
  77     ESPState esp;
  78 };
  79
  80 static void esp_pci_handle_idle(PCIESPState *pci, uint32_t val)
  81 {
  82     ESPState *s = ESP(&pci->esp);
  83
  84     trace_esp_pci_dma_idle(val);
  85     esp_dma_enable(s, 0, 0);
  86 }
  87
  88 static void esp_pci_handle_blast(PCIESPState *pci, uint32_t val)
  89 {
  90     trace_esp_pci_dma_blast(val);
  91     qemu_log_mask(LOG_UNIMP, "am53c974: cmd BLAST not implemented\n");
  92 }
  93
  94 static void esp_pci_handle_abort(PCIESPState *pci, uint32_t val)
  95 {
  96     ESPState *s = ESP(&pci->esp);
  97
  98     trace_esp_pci_dma_abort(val);
  99     if (s->current_req) {
 100         scsi_req_cancel(s->current_req);
 101     }
 102 }
 103
 104 static void esp_pci_handle_start(PCIESPState *pci, uint32_t val)
 105 {
 106     ESPState *s = ESP(&pci->esp);
 107
 108     trace_esp_pci_dma_start(val);
 109
 110     pci->dma_regs[DMA_WBC] = pci->dma_regs[DMA_STC];
 111     pci->dma_regs[DMA_WAC] = pci->dma_regs[DMA_SPA];
 112     pci->dma_regs[DMA_WMAC] = pci->dma_regs[DMA_SMDLA];
 113
 114     pci->dma_regs[DMA_STAT] &= ~(DMA_STAT_BCMBLT | DMA_STAT_SCSIINT
 115                                | DMA_STAT_DONE | DMA_STAT_ABORT
 116                                | DMA_STAT_ERROR | DMA_STAT_PWDN);
 117
 118     esp_dma_enable(s, 0, 1);
 119 }
 120
 121 static void esp_pci_dma_write(PCIESPState *pci, uint32_t saddr, uint32_t val)
 122 {
 123     trace_esp_pci_dma_write(saddr, pci->dma_regs[saddr], val);
 124     switch (saddr) {
 125     case DMA_CMD:
 126         pci->dma_regs[saddr] = val;
 127         switch (val & DMA_CMD_MASK) {
 128         case 0x0: /* IDLE */
 129             esp_pci_handle_idle(pci, val);
 130             break;
 131         case 0x1: /* BLAST */
 132             esp_pci_handle_blast(pci, val);
 133             break;
 134         case 0x2: /* ABORT */
 135             esp_pci_handle_abort(pci, val);
 136             break;
 137         case 0x3: /* START */
 138             esp_pci_handle_start(pci, val);
 139             break;
 140         default: /* can't happen */
 141             abort();
 142         }
 143         break;
 144     case DMA_STC:
 145     case DMA_SPA:
 146     case DMA_SMDLA:
 147         pci->dma_regs[saddr] = val;
 148         break;
 149     case DMA_STAT:
 150         if (pci->sbac & SBAC_STATUS) {
 151             /* clear some bits on write */
 152             uint32_t mask = DMA_STAT_ERROR | DMA_STAT_ABORT | DMA_STAT_DONE;
 153             pci->dma_regs[DMA_STAT] &= ~(val & mask);
 154         }
 155         break;
 156     default:
 157         trace_esp_pci_error_invalid_write_dma(val, saddr);
 158         return;
 159     }
 160 }
 161
 162 static uint32_t esp_pci_dma_read(PCIESPState *pci, uint32_t saddr)
 163 {
 164     ESPState *s = ESP(&pci->esp);
 165     uint32_t val;
 166
 167     val = pci->dma_regs[saddr];
 168     if (saddr == DMA_STAT) {
 169         if (s->rregs[ESP_RSTAT] & STAT_INT) {
 170             val |= DMA_STAT_SCSIINT;
 171         }
 172         if (!(pci->sbac & SBAC_STATUS)) {
 173             pci->dma_regs[DMA_STAT] &= ~(DMA_STAT_ERROR | DMA_STAT_ABORT |
 174                                          DMA_STAT_DONE);
 175         }
 176     }
 177
 178     trace_esp_pci_dma_read(saddr, val);
 179     return val;
 180 }
 181
 182 static void esp_pci_io_write(void *opaque, hwaddr addr,
 183                              uint64_t val, unsigned int size)
 184 {
 185     PCIESPState *pci = opaque;
 186     ESPState *s = ESP(&pci->esp);
 187
 188     if (size < 4 || addr & 3) {
 189         /* need to upgrade request: we only support 4-bytes accesses */
 190         uint32_t current = 0, mask;
 191         int shift;
 192
 193         if (addr < 0x40) {
 194             current = s->wregs[addr >> 2];
 195         } else if (addr < 0x60) {
 196             current = pci->dma_regs[(addr - 0x40) >> 2];
 197         } else if (addr < 0x74) {
 198             current = pci->sbac;
 199         }
 200
 201         shift = (4 - size) * 8;
 202         mask = (~(uint32_t)0 << shift) >> shift;
 203
 204         shift = ((4 - (addr & 3)) & 3) * 8;
 205         val <<= shift;
 206         val |= current & ~(mask << shift);
 207         addr &= ~3;
 208         size = 4;
 209     }
 210     g_assert(size >= 4);
 211
 212     if (addr < 0x40) {
 213         /* SCSI core reg */
 214         esp_reg_write(s, addr >> 2, val);
 215     } else if (addr < 0x60) {
 216         /* PCI DMA CCB */
 217         esp_pci_dma_write(pci, (addr - 0x40) >> 2, val);
 218     } else if (addr == 0x70) {
 219         /* DMA SCSI Bus and control */
 220         trace_esp_pci_sbac_write(pci->sbac, val);
 221         pci->sbac = val;
 222     } else {
 223         trace_esp_pci_error_invalid_write((int)addr);
 224     }
 225 }
 226
 227 static uint64_t esp_pci_io_read(void *opaque, hwaddr addr,
 228                                 unsigned int size)
 229 {
 230     PCIESPState *pci = opaque;
 231     ESPState *s = ESP(&pci->esp);
 232     uint32_t ret;
 233
 234     if (addr < 0x40) {
 235         /* SCSI core reg */
 236         ret = esp_reg_read(s, addr >> 2);
 237     } else if (addr < 0x60) {
 238         /* PCI DMA CCB */
 239         ret = esp_pci_dma_read(pci, (addr - 0x40) >> 2);
 240     } else if (addr == 0x70) {
 241         /* DMA SCSI Bus and control */
 242         trace_esp_pci_sbac_read(pci->sbac);
 243         ret = pci->sbac;
 244     } else {
 245         /* Invalid region */
 246         trace_esp_pci_error_invalid_read((int)addr);
 247         ret = 0;
 248     }
 249
 250     /* give only requested data */
 251     ret >>= (addr & 3) * 8;
 252     ret &= ~(~(uint64_t)0 << (8 * size));
 253
 254     return ret;
 255 }
 256
 257 static void esp_pci_dma_memory_rw(PCIESPState *pci, uint8_t *buf, int len,
 258                                   DMADirection dir)
 259 {
 260     dma_addr_t addr;
 261     DMADirection expected_dir;
 262
 263     if (pci->dma_regs[DMA_CMD] & DMA_CMD_DIR) {
 264         expected_dir = DMA_DIRECTION_FROM_DEVICE;
 265     } else {
 266         expected_dir = DMA_DIRECTION_TO_DEVICE;
 267     }
 268
 269     if (dir != expected_dir) {
 270         trace_esp_pci_error_invalid_dma_direction();
 271         return;
 272     }
 273
 274     if (pci->dma_regs[DMA_STAT] & DMA_CMD_MDL) {
 275         qemu_log_mask(LOG_UNIMP, "am53c974: MDL transfer not implemented\n");
 276     }
 277
 278     addr = pci->dma_regs[DMA_SPA];
 279     if (pci->dma_regs[DMA_WBC] < len) {
 280         len = pci->dma_regs[DMA_WBC];
 281     }
 282
 283     pci_dma_rw(PCI_DEVICE(pci), addr, buf, len, dir);
 284
 285     /* update status registers */
 286     pci->dma_regs[DMA_WBC] -= len;
 287     pci->dma_regs[DMA_WAC] += len;
 288     if (pci->dma_regs[DMA_WBC] == 0) {
 289         pci->dma_regs[DMA_STAT] |= DMA_STAT_DONE;
 290     }
 291 }
 292
 293 static void esp_pci_dma_memory_read(void *opaque, uint8_t *buf, int len)
 294 {
 295     PCIESPState *pci = opaque;
 296     esp_pci_dma_memory_rw(pci, buf, len, DMA_DIRECTION_TO_DEVICE);
 297 }
 298
 299 static void esp_pci_dma_memory_write(void *opaque, uint8_t *buf, int len)
 300 {
 301     PCIESPState *pci = opaque;
 302     esp_pci_dma_memory_rw(pci, buf, len, DMA_DIRECTION_FROM_DEVICE);
 303 }
 304
 305 static const MemoryRegionOps esp_pci_io_ops = {
 306     .read = esp_pci_io_read,
 307     .write = esp_pci_io_write,
 308     .endianness = DEVICE_LITTLE_ENDIAN,
 309     .impl = {
 310         .min_access_size = 1,
 311         .max_access_size = 4,
 312     },
 313 };
 314
 315 static void esp_pci_hard_reset(DeviceState *dev)
 316 {
 317     PCIESPState *pci = PCI_ESP(dev);
 318     ESPState *s = ESP(&pci->esp);
 319
 320     esp_hard_reset(s);
 321     pci->dma_regs[DMA_CMD] &= ~(DMA_CMD_DIR | DMA_CMD_INTE_D | DMA_CMD_INTE_P
 322                               | DMA_CMD_MDL | DMA_CMD_DIAG | DMA_CMD_MASK);
 323     pci->dma_regs[DMA_WBC] &= ~0xffff;
 324     pci->dma_regs[DMA_WAC] = 0xffffffff;
 325     pci->dma_regs[DMA_STAT] &= ~(DMA_STAT_BCMBLT | DMA_STAT_SCSIINT
 326                                | DMA_STAT_DONE | DMA_STAT_ABORT
 327                                | DMA_STAT_ERROR);
 328     pci->dma_regs[DMA_WMAC] = 0xfffffffd;
 329 }
 330
 331 static const VMStateDescription vmstate_esp_pci_scsi = {
 332     .name = "pciespscsi",
 333     .version_id = 2,
 334     .minimum_version_id = 1,
 335     .pre_save = esp_pre_save,
 336     .fields = (VMStateField[]) {
 337         VMSTATE_PCI_DEVICE(parent_obj, PCIESPState),
 338         VMSTATE_BUFFER_UNSAFE(dma_regs, PCIESPState, 0, 8 * sizeof(uint32_t)),
 339         VMSTATE_UINT8_V(esp.mig_version_id, PCIESPState, 2),
 340         VMSTATE_STRUCT(esp, PCIESPState, 0, vmstate_esp, ESPState),
 341         VMSTATE_END_OF_LIST()
 342     }
 343 };
 344
 345 static void esp_pci_command_complete(SCSIRequest *req, size_t resid)
 346 {
 347     ESPState *s = req->hba_private;
 348     PCIESPState *pci = container_of(s, PCIESPState, esp);
 349
 350     esp_command_complete(req, resid);
 351     pci->dma_regs[DMA_WBC] = 0;
 352     pci->dma_regs[DMA_STAT] |= DMA_STAT_DONE;
 353 }
 354
 355 static const struct SCSIBusInfo esp_pci_scsi_info = {
 356     .tcq = false,
 357     .max_target = ESP_MAX_DEVS,
 358     .max_lun = 7,
 359
 360     .transfer_data = esp_transfer_data,
 361     .complete = esp_pci_command_complete,
 362     .cancel = esp_request_cancelled,
 363 };
 364
 365 static void esp_pci_scsi_realize(PCIDevice *dev, Error **errp)
 366 {
 367     PCIESPState *pci = PCI_ESP(dev);
 368     DeviceState *d = DEVICE(dev);
 369     ESPState *s = ESP(&pci->esp);
 370     uint8_t *pci_conf;
 371
 372     if (!qdev_realize(DEVICE(s), NULL, errp)) {
 373         return;
 374     }
 375
 376     pci_conf = dev->config;
 377
 378     /* Interrupt pin A */
 379     pci_conf[PCI_INTERRUPT_PIN] = 0x01;
 380
 381     s->dma_memory_read = esp_pci_dma_memory_read;
 382     s->dma_memory_write = esp_pci_dma_memory_write;
 383     s->dma_opaque = pci;
 384     s->chip_id = TCHI_AM53C974;
 385     memory_region_init_io(&pci->io, OBJECT(pci), &esp_pci_io_ops, pci,
 386                           "esp-io", 0x80);
 387
 388     pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &pci->io);
 389     s->irq = pci_allocate_irq(dev);
 390
 391     scsi_bus_new(&s->bus, sizeof(s->bus), d, &esp_pci_scsi_info, NULL);
 392 }
 393
 394 static void esp_pci_scsi_exit(PCIDevice *d)
 395 {
 396     PCIESPState *pci = PCI_ESP(d);
 397     ESPState *s = ESP(&pci->esp);
 398
 399     qemu_free_irq(s->irq);
 400 }
 401
 402 static void esp_pci_init(Object *obj)
 403 {
 404     PCIESPState *pci = PCI_ESP(obj);
 405
 406     object_initialize_child(obj, "esp", &pci->esp, TYPE_ESP);
 407 }
 408
 409 static void esp_pci_class_init(ObjectClass *klass, void *data)
 410 {
 411     DeviceClass *dc = DEVICE_CLASS(klass);
 412     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 413
 414     k->realize = esp_pci_scsi_realize;
 415     k->exit = esp_pci_scsi_exit;
 416     k->vendor_id = PCI_VENDOR_ID_AMD;
 417     k->device_id = PCI_DEVICE_ID_AMD_SCSI;
 418     k->revision = 0x10;
 419     k->class_id = PCI_CLASS_STORAGE_SCSI;
 420     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 421     dc->desc = "AMD Am53c974 PCscsi-PCI SCSI adapter";
 422     dc->reset = esp_pci_hard_reset;
 423     dc->vmsd = &vmstate_esp_pci_scsi;
 424 }
 425
 426 static const TypeInfo esp_pci_info = {
 427     .name = TYPE_AM53C974_DEVICE,
 428     .parent = TYPE_PCI_DEVICE,
 429     .instance_init = esp_pci_init,
 430     .instance_size = sizeof(PCIESPState),
 431     .class_init = esp_pci_class_init,
 432     .interfaces = (InterfaceInfo[]) {
 433         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 434         { },
 435     },
 436 };
 437
 438 struct DC390State {
 439     PCIESPState pci;
 440     eeprom_t *eeprom;
 441 };
 442 typedef struct DC390State DC390State;
 443
 444 #define TYPE_DC390_DEVICE "dc390"
 445 DECLARE_INSTANCE_CHECKER(DC390State, DC390,
 446                          TYPE_DC390_DEVICE)
 447
 448 #define EE_ADAPT_SCSI_ID 64
 449 #define EE_MODE2         65
 450 #define EE_DELAY         66
 451 #define EE_TAG_CMD_NUM   67
 452 #define EE_ADAPT_OPTIONS 68
 453 #define EE_BOOT_SCSI_ID  69
 454 #define EE_BOOT_SCSI_LUN 70
 455 #define EE_CHKSUM1       126
 456 #define EE_CHKSUM2       127
 457
 458 #define EE_ADAPT_OPTION_F6_F8_AT_BOOT   0x01
 459 #define EE_ADAPT_OPTION_BOOT_FROM_CDROM 0x02
 460 #define EE_ADAPT_OPTION_INT13           0x04
 461 #define EE_ADAPT_OPTION_SCAM_SUPPORT    0x08
 462
 463
 464 static uint32_t dc390_read_config(PCIDevice *dev, uint32_t addr, int l)
 465 {
 466     DC390State *pci = DC390(dev);
 467     uint32_t val;
 468
 469     val = pci_default_read_config(dev, addr, l);
 470
 471     if (addr == 0x00 && l == 1) {
 472         /* First byte of address space is AND-ed with EEPROM DO line */
 473         if (!eeprom93xx_read(pci->eeprom)) {
 474             val &= ~0xff;
 475         }
 476     }
 477
 478     return val;
 479 }
 480
 481 static void dc390_write_config(PCIDevice *dev,
 482                                uint32_t addr, uint32_t val, int l)
 483 {
 484     DC390State *pci = DC390(dev);
 485     if (addr == 0x80) {
 486         /* EEPROM write */
 487         int eesk = val & 0x80 ? 1 : 0;
 488         int eedi = val & 0x40 ? 1 : 0;
 489         eeprom93xx_write(pci->eeprom, 1, eesk, eedi);
 490     } else if (addr == 0xc0) {
 491         /* EEPROM CS low */
 492         eeprom93xx_write(pci->eeprom, 0, 0, 0);
 493     } else {
 494         pci_default_write_config(dev, addr, val, l);
 495     }
 496 }
 497
 498 static void dc390_scsi_realize(PCIDevice *dev, Error **errp)
 499 {
 500     DC390State *pci = DC390(dev);
 501     Error *err = NULL;
 502     uint8_t *contents;
 503     uint16_t chksum = 0;
 504     int i;
 505
 506     /* init base class */
 507     esp_pci_scsi_realize(dev, &err);
 508     if (err) {
 509         error_propagate(errp, err);
 510         return;
 511     }
 512
 513     /* EEPROM */
 514     pci->eeprom = eeprom93xx_new(DEVICE(dev), 64);
 515
 516     /* set default eeprom values */
 517     contents = (uint8_t *)eeprom93xx_data(pci->eeprom);
 518
 519     for (i = 0; i < 16; i++) {
 520         contents[i * 2] = 0x57;
 521         contents[i * 2 + 1] = 0x00;
 522     }
 523     contents[EE_ADAPT_SCSI_ID] = 7;
 524     contents[EE_MODE2] = 0x0f;
 525     contents[EE_TAG_CMD_NUM] = 0x04;
 526     contents[EE_ADAPT_OPTIONS] = EE_ADAPT_OPTION_F6_F8_AT_BOOT
 527                                | EE_ADAPT_OPTION_BOOT_FROM_CDROM
 528                                | EE_ADAPT_OPTION_INT13;
 529
 530     /* update eeprom checksum */
 531     for (i = 0; i < EE_CHKSUM1; i += 2) {
 532         chksum += contents[i] + (((uint16_t)contents[i + 1]) << 8);
 533     }
 534     chksum = 0x1234 - chksum;
 535     contents[EE_CHKSUM1] = chksum & 0xff;
 536     contents[EE_CHKSUM2] = chksum >> 8;
 537 }
 538
 539 static void dc390_class_init(ObjectClass *klass, void *data)
 540 {
 541     DeviceClass *dc = DEVICE_CLASS(klass);
 542     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 543
 544     k->realize = dc390_scsi_realize;
 545     k->config_read = dc390_read_config;
 546     k->config_write = dc390_write_config;
 547     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 548     dc->desc = "Tekram DC-390 SCSI adapter";
 549 }
 550
 551 static const TypeInfo dc390_info = {
 552     .name = TYPE_DC390_DEVICE,
 553     .parent = TYPE_AM53C974_DEVICE,
 554     .instance_size = sizeof(DC390State),
 555     .class_init = dc390_class_init,
 556 };
 557
 558 static void esp_pci_register_types(void)
 559 {
 560     type_register_static(&esp_pci_info);
 561     type_register_static(&dc390_info);
 562 }
 563
 564 type_init(esp_pci_register_types)