1 /* 2 * Arm PrimeCell PL181 MultiMedia Card Interface 3 * 4 * Copyright (c) 2007 CodeSourcery. 5 * Written by Paul Brook 6 * 7 * This code is licensed under the GPL. 8 */ 9 10 #include "qemu/osdep.h" 11 #include "sysemu/blockdev.h" 12 #include "hw/sysbus.h" 13 #include "migration/vmstate.h" 14 #include "hw/irq.h" 15 #include "hw/sd/sd.h" 16 #include "qemu/log.h" 17 #include "qemu/module.h" 18 #include "qemu/error-report.h" 19 #include "qapi/error.h" 20 #include "trace.h" 21 #include "qom/object.h" 22 23 #define PL181_FIFO_LEN 16 24 25 #define TYPE_PL181 "pl181" 26 OBJECT_DECLARE_SIMPLE_TYPE(PL181State, PL181) 27 28 #define TYPE_PL181_BUS "pl181-bus" 29 30 struct PL181State { 31 SysBusDevice parent_obj; 32 33 MemoryRegion iomem; 34 SDBus sdbus; 35 uint32_t clock; 36 uint32_t power; 37 uint32_t cmdarg; 38 uint32_t cmd; 39 uint32_t datatimer; 40 uint32_t datalength; 41 uint32_t respcmd; 42 uint32_t response[4]; 43 uint32_t datactrl; 44 uint32_t datacnt; 45 uint32_t status; 46 uint32_t mask[2]; 47 int32_t fifo_pos; 48 int32_t fifo_len; 49 /* The linux 2.6.21 driver is buggy, and misbehaves if new data arrives 50 while it is reading the FIFO. We hack around this by deferring 51 subsequent transfers until after the driver polls the status word. 52 http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=4446/1 53 */ 54 int32_t linux_hack; 55 uint32_t fifo[PL181_FIFO_LEN]; /* TODO use Fifo32 */ 56 qemu_irq irq[2]; 57 /* GPIO outputs for 'card is readonly' and 'card inserted' */ 58 qemu_irq card_readonly; 59 qemu_irq card_inserted; 60 }; 61 62 static const VMStateDescription vmstate_pl181 = { 63 .name = "pl181", 64 .version_id = 1, 65 .minimum_version_id = 1, 66 .fields = (const VMStateField[]) { 67 VMSTATE_UINT32(clock, PL181State), 68 VMSTATE_UINT32(power, PL181State), 69 VMSTATE_UINT32(cmdarg, PL181State), 70 VMSTATE_UINT32(cmd, PL181State), 71 VMSTATE_UINT32(datatimer, PL181State), 72 VMSTATE_UINT32(datalength, PL181State), 73 VMSTATE_UINT32(respcmd, PL181State), 74 VMSTATE_UINT32_ARRAY(response, PL181State, 4), 75 VMSTATE_UINT32(datactrl, PL181State), 76 VMSTATE_UINT32(datacnt, PL181State), 77 VMSTATE_UINT32(status, PL181State), 78 VMSTATE_UINT32_ARRAY(mask, PL181State, 2), 79 VMSTATE_INT32(fifo_pos, PL181State), 80 VMSTATE_INT32(fifo_len, PL181State), 81 VMSTATE_INT32(linux_hack, PL181State), 82 VMSTATE_UINT32_ARRAY(fifo, PL181State, PL181_FIFO_LEN), 83 VMSTATE_END_OF_LIST() 84 } 85 }; 86 87 #define PL181_CMD_INDEX 0x3f 88 #define PL181_CMD_RESPONSE (1 << 6) 89 #define PL181_CMD_LONGRESP (1 << 7) 90 #define PL181_CMD_INTERRUPT (1 << 8) 91 #define PL181_CMD_PENDING (1 << 9) 92 #define PL181_CMD_ENABLE (1 << 10) 93 94 #define PL181_DATA_ENABLE (1 << 0) 95 #define PL181_DATA_DIRECTION (1 << 1) 96 #define PL181_DATA_MODE (1 << 2) 97 #define PL181_DATA_DMAENABLE (1 << 3) 98 99 #define PL181_STATUS_CMDCRCFAIL (1 << 0) 100 #define PL181_STATUS_DATACRCFAIL (1 << 1) 101 #define PL181_STATUS_CMDTIMEOUT (1 << 2) 102 #define PL181_STATUS_DATATIMEOUT (1 << 3) 103 #define PL181_STATUS_TXUNDERRUN (1 << 4) 104 #define PL181_STATUS_RXOVERRUN (1 << 5) 105 #define PL181_STATUS_CMDRESPEND (1 << 6) 106 #define PL181_STATUS_CMDSENT (1 << 7) 107 #define PL181_STATUS_DATAEND (1 << 8) 108 #define PL181_STATUS_DATABLOCKEND (1 << 10) 109 #define PL181_STATUS_CMDACTIVE (1 << 11) 110 #define PL181_STATUS_TXACTIVE (1 << 12) 111 #define PL181_STATUS_RXACTIVE (1 << 13) 112 #define PL181_STATUS_TXFIFOHALFEMPTY (1 << 14) 113 #define PL181_STATUS_RXFIFOHALFFULL (1 << 15) 114 #define PL181_STATUS_TXFIFOFULL (1 << 16) 115 #define PL181_STATUS_RXFIFOFULL (1 << 17) 116 #define PL181_STATUS_TXFIFOEMPTY (1 << 18) 117 #define PL181_STATUS_RXFIFOEMPTY (1 << 19) 118 #define PL181_STATUS_TXDATAAVLBL (1 << 20) 119 #define PL181_STATUS_RXDATAAVLBL (1 << 21) 120 121 #define PL181_STATUS_TX_FIFO (PL181_STATUS_TXACTIVE \ 122 |PL181_STATUS_TXFIFOHALFEMPTY \ 123 |PL181_STATUS_TXFIFOFULL \ 124 |PL181_STATUS_TXFIFOEMPTY \ 125 |PL181_STATUS_TXDATAAVLBL) 126 #define PL181_STATUS_RX_FIFO (PL181_STATUS_RXACTIVE \ 127 |PL181_STATUS_RXFIFOHALFFULL \ 128 |PL181_STATUS_RXFIFOFULL \ 129 |PL181_STATUS_RXFIFOEMPTY \ 130 |PL181_STATUS_RXDATAAVLBL) 131 132 static const unsigned char pl181_id[] = 133 { 0x81, 0x11, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 }; 134 135 static void pl181_update(PL181State *s) 136 { 137 int i; 138 for (i = 0; i < 2; i++) { 139 qemu_set_irq(s->irq[i], (s->status & s->mask[i]) != 0); 140 } 141 } 142 143 static void pl181_fifo_push(PL181State *s, uint32_t value) 144 { 145 int n; 146 147 if (s->fifo_len == PL181_FIFO_LEN) { 148 error_report("%s: FIFO overflow", __func__); 149 return; 150 } 151 n = (s->fifo_pos + s->fifo_len) & (PL181_FIFO_LEN - 1); 152 s->fifo_len++; 153 s->fifo[n] = value; 154 trace_pl181_fifo_push(value); 155 } 156 157 static uint32_t pl181_fifo_pop(PL181State *s) 158 { 159 uint32_t value; 160 161 if (s->fifo_len == 0) { 162 error_report("%s: FIFO underflow", __func__); 163 return 0; 164 } 165 value = s->fifo[s->fifo_pos]; 166 s->fifo_len--; 167 s->fifo_pos = (s->fifo_pos + 1) & (PL181_FIFO_LEN - 1); 168 trace_pl181_fifo_pop(value); 169 return value; 170 } 171 172 static void pl181_do_command(PL181State *s) 173 { 174 SDRequest request; 175 uint8_t response[16]; 176 int rlen; 177 178 request.cmd = s->cmd & PL181_CMD_INDEX; 179 request.arg = s->cmdarg; 180 trace_pl181_command_send(request.cmd, request.arg); 181 rlen = sdbus_do_command(&s->sdbus, &request, response); 182 if (rlen < 0) 183 goto error; 184 if (s->cmd & PL181_CMD_RESPONSE) { 185 if (rlen == 0 || (rlen == 4 && (s->cmd & PL181_CMD_LONGRESP))) 186 goto error; 187 if (rlen != 4 && rlen != 16) 188 goto error; 189 s->response[0] = ldl_be_p(&response[0]); 190 if (rlen == 4) { 191 s->response[1] = s->response[2] = s->response[3] = 0; 192 } else { 193 s->response[1] = ldl_be_p(&response[4]); 194 s->response[2] = ldl_be_p(&response[8]); 195 s->response[3] = ldl_be_p(&response[12]) & ~1; 196 } 197 trace_pl181_command_response_pending(); 198 s->status |= PL181_STATUS_CMDRESPEND; 199 } else { 200 trace_pl181_command_sent(); 201 s->status |= PL181_STATUS_CMDSENT; 202 } 203 return; 204 205 error: 206 trace_pl181_command_timeout(); 207 s->status |= PL181_STATUS_CMDTIMEOUT; 208 } 209 210 /* Transfer data between the card and the FIFO. This is complicated by 211 the FIFO holding 32-bit words and the card taking data in single byte 212 chunks. FIFO bytes are transferred in little-endian order. */ 213 214 static void pl181_fifo_run(PL181State *s) 215 { 216 uint32_t bits; 217 uint32_t value = 0; 218 int n; 219 int is_read; 220 221 is_read = (s->datactrl & PL181_DATA_DIRECTION) != 0; 222 if (s->datacnt != 0 && (!is_read || sdbus_data_ready(&s->sdbus)) 223 && !s->linux_hack) { 224 if (is_read) { 225 n = 0; 226 while (s->datacnt && s->fifo_len < PL181_FIFO_LEN) { 227 value |= (uint32_t)sdbus_read_byte(&s->sdbus) << (n * 8); 228 s->datacnt--; 229 n++; 230 if (n == 4) { 231 pl181_fifo_push(s, value); 232 n = 0; 233 value = 0; 234 } 235 } 236 if (n != 0) { 237 pl181_fifo_push(s, value); 238 } 239 } else { /* write */ 240 n = 0; 241 while (s->datacnt > 0 && (s->fifo_len > 0 || n > 0)) { 242 if (n == 0) { 243 value = pl181_fifo_pop(s); 244 n = 4; 245 } 246 n--; 247 s->datacnt--; 248 sdbus_write_byte(&s->sdbus, value & 0xff); 249 value >>= 8; 250 } 251 } 252 } 253 s->status &= ~(PL181_STATUS_RX_FIFO | PL181_STATUS_TX_FIFO); 254 if (s->datacnt == 0) { 255 s->status |= PL181_STATUS_DATAEND; 256 /* HACK: */ 257 s->status |= PL181_STATUS_DATABLOCKEND; 258 trace_pl181_fifo_transfer_complete(); 259 } 260 if (s->datacnt == 0 && s->fifo_len == 0) { 261 s->datactrl &= ~PL181_DATA_ENABLE; 262 trace_pl181_data_engine_idle(); 263 } else { 264 /* Update FIFO bits. */ 265 bits = PL181_STATUS_TXACTIVE | PL181_STATUS_RXACTIVE; 266 if (s->fifo_len == 0) { 267 bits |= PL181_STATUS_TXFIFOEMPTY; 268 bits |= PL181_STATUS_RXFIFOEMPTY; 269 } else { 270 bits |= PL181_STATUS_TXDATAAVLBL; 271 bits |= PL181_STATUS_RXDATAAVLBL; 272 } 273 if (s->fifo_len == 16) { 274 bits |= PL181_STATUS_TXFIFOFULL; 275 bits |= PL181_STATUS_RXFIFOFULL; 276 } 277 if (s->fifo_len <= 8) { 278 bits |= PL181_STATUS_TXFIFOHALFEMPTY; 279 } 280 if (s->fifo_len >= 8) { 281 bits |= PL181_STATUS_RXFIFOHALFFULL; 282 } 283 if (s->datactrl & PL181_DATA_DIRECTION) { 284 bits &= PL181_STATUS_RX_FIFO; 285 } else { 286 bits &= PL181_STATUS_TX_FIFO; 287 } 288 s->status |= bits; 289 } 290 } 291 292 static uint64_t pl181_read(void *opaque, hwaddr offset, 293 unsigned size) 294 { 295 PL181State *s = (PL181State *)opaque; 296 uint32_t tmp; 297 298 if (offset >= 0xfe0 && offset < 0x1000) { 299 return pl181_id[(offset - 0xfe0) >> 2]; 300 } 301 switch (offset) { 302 case 0x00: /* Power */ 303 return s->power; 304 case 0x04: /* Clock */ 305 return s->clock; 306 case 0x08: /* Argument */ 307 return s->cmdarg; 308 case 0x0c: /* Command */ 309 return s->cmd; 310 case 0x10: /* RespCmd */ 311 return s->respcmd; 312 case 0x14: /* Response0 */ 313 return s->response[0]; 314 case 0x18: /* Response1 */ 315 return s->response[1]; 316 case 0x1c: /* Response2 */ 317 return s->response[2]; 318 case 0x20: /* Response3 */ 319 return s->response[3]; 320 case 0x24: /* DataTimer */ 321 return s->datatimer; 322 case 0x28: /* DataLength */ 323 return s->datalength; 324 case 0x2c: /* DataCtrl */ 325 return s->datactrl; 326 case 0x30: /* DataCnt */ 327 return s->datacnt; 328 case 0x34: /* Status */ 329 tmp = s->status; 330 if (s->linux_hack) { 331 s->linux_hack = 0; 332 pl181_fifo_run(s); 333 pl181_update(s); 334 } 335 return tmp; 336 case 0x3c: /* Mask0 */ 337 return s->mask[0]; 338 case 0x40: /* Mask1 */ 339 return s->mask[1]; 340 case 0x48: /* FifoCnt */ 341 /* The documentation is somewhat vague about exactly what FifoCnt 342 does. On real hardware it appears to be when decrememnted 343 when a word is transferred between the FIFO and the serial 344 data engine. DataCnt is decremented after each byte is 345 transferred between the serial engine and the card. 346 We don't emulate this level of detail, so both can be the same. */ 347 tmp = (s->datacnt + 3) >> 2; 348 if (s->linux_hack) { 349 s->linux_hack = 0; 350 pl181_fifo_run(s); 351 pl181_update(s); 352 } 353 return tmp; 354 case 0x80: case 0x84: case 0x88: case 0x8c: /* FifoData */ 355 case 0x90: case 0x94: case 0x98: case 0x9c: 356 case 0xa0: case 0xa4: case 0xa8: case 0xac: 357 case 0xb0: case 0xb4: case 0xb8: case 0xbc: 358 if (s->fifo_len == 0) { 359 qemu_log_mask(LOG_GUEST_ERROR, "pl181: Unexpected FIFO read\n"); 360 return 0; 361 } else { 362 uint32_t value; 363 value = pl181_fifo_pop(s); 364 s->linux_hack = 1; 365 pl181_fifo_run(s); 366 pl181_update(s); 367 return value; 368 } 369 default: 370 qemu_log_mask(LOG_GUEST_ERROR, 371 "pl181_read: Bad offset %x\n", (int)offset); 372 return 0; 373 } 374 } 375 376 static void pl181_write(void *opaque, hwaddr offset, 377 uint64_t value, unsigned size) 378 { 379 PL181State *s = (PL181State *)opaque; 380 381 switch (offset) { 382 case 0x00: /* Power */ 383 s->power = value & 0xff; 384 break; 385 case 0x04: /* Clock */ 386 s->clock = value & 0xff; 387 break; 388 case 0x08: /* Argument */ 389 s->cmdarg = value; 390 break; 391 case 0x0c: /* Command */ 392 s->cmd = value; 393 if (s->cmd & PL181_CMD_ENABLE) { 394 if (s->cmd & PL181_CMD_INTERRUPT) { 395 qemu_log_mask(LOG_UNIMP, 396 "pl181: Interrupt mode not implemented\n"); 397 } if (s->cmd & PL181_CMD_PENDING) { 398 qemu_log_mask(LOG_UNIMP, 399 "pl181: Pending commands not implemented\n"); 400 } else { 401 pl181_do_command(s); 402 pl181_fifo_run(s); 403 } 404 /* The command has completed one way or the other. */ 405 s->cmd &= ~PL181_CMD_ENABLE; 406 } 407 break; 408 case 0x24: /* DataTimer */ 409 s->datatimer = value; 410 break; 411 case 0x28: /* DataLength */ 412 s->datalength = value & 0xffff; 413 break; 414 case 0x2c: /* DataCtrl */ 415 s->datactrl = value & 0xff; 416 if (value & PL181_DATA_ENABLE) { 417 s->datacnt = s->datalength; 418 pl181_fifo_run(s); 419 } 420 break; 421 case 0x38: /* Clear */ 422 s->status &= ~(value & 0x7ff); 423 break; 424 case 0x3c: /* Mask0 */ 425 s->mask[0] = value; 426 break; 427 case 0x40: /* Mask1 */ 428 s->mask[1] = value; 429 break; 430 case 0x80: case 0x84: case 0x88: case 0x8c: /* FifoData */ 431 case 0x90: case 0x94: case 0x98: case 0x9c: 432 case 0xa0: case 0xa4: case 0xa8: case 0xac: 433 case 0xb0: case 0xb4: case 0xb8: case 0xbc: 434 if (s->datacnt == 0) { 435 qemu_log_mask(LOG_GUEST_ERROR, "pl181: Unexpected FIFO write\n"); 436 } else { 437 pl181_fifo_push(s, value); 438 pl181_fifo_run(s); 439 } 440 break; 441 default: 442 qemu_log_mask(LOG_GUEST_ERROR, 443 "pl181_write: Bad offset %x\n", (int)offset); 444 } 445 pl181_update(s); 446 } 447 448 static const MemoryRegionOps pl181_ops = { 449 .read = pl181_read, 450 .write = pl181_write, 451 .endianness = DEVICE_NATIVE_ENDIAN, 452 }; 453 454 static void pl181_set_readonly(DeviceState *dev, bool level) 455 { 456 PL181State *s = (PL181State *)dev; 457 458 qemu_set_irq(s->card_readonly, level); 459 } 460 461 static void pl181_set_inserted(DeviceState *dev, bool level) 462 { 463 PL181State *s = (PL181State *)dev; 464 465 qemu_set_irq(s->card_inserted, level); 466 } 467 468 static void pl181_reset(DeviceState *d) 469 { 470 PL181State *s = PL181(d); 471 472 s->power = 0; 473 s->cmdarg = 0; 474 s->cmd = 0; 475 s->datatimer = 0; 476 s->datalength = 0; 477 s->respcmd = 0; 478 s->response[0] = 0; 479 s->response[1] = 0; 480 s->response[2] = 0; 481 s->response[3] = 0; 482 s->datatimer = 0; 483 s->datalength = 0; 484 s->datactrl = 0; 485 s->datacnt = 0; 486 s->status = 0; 487 s->linux_hack = 0; 488 s->mask[0] = 0; 489 s->mask[1] = 0; 490 491 /* Reset other state based on current card insertion/readonly status */ 492 pl181_set_inserted(DEVICE(s), sdbus_get_inserted(&s->sdbus)); 493 pl181_set_readonly(DEVICE(s), sdbus_get_readonly(&s->sdbus)); 494 } 495 496 static void pl181_init(Object *obj) 497 { 498 DeviceState *dev = DEVICE(obj); 499 PL181State *s = PL181(obj); 500 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 501 502 memory_region_init_io(&s->iomem, obj, &pl181_ops, s, "pl181", 0x1000); 503 sysbus_init_mmio(sbd, &s->iomem); 504 sysbus_init_irq(sbd, &s->irq[0]); 505 sysbus_init_irq(sbd, &s->irq[1]); 506 qdev_init_gpio_out_named(dev, &s->card_readonly, "card-read-only", 1); 507 qdev_init_gpio_out_named(dev, &s->card_inserted, "card-inserted", 1); 508 509 qbus_init(&s->sdbus, sizeof(s->sdbus), TYPE_PL181_BUS, dev, "sd-bus"); 510 } 511 512 static void pl181_class_init(ObjectClass *klass, void *data) 513 { 514 DeviceClass *k = DEVICE_CLASS(klass); 515 516 k->vmsd = &vmstate_pl181; 517 k->reset = pl181_reset; 518 /* Reason: output IRQs should be wired up */ 519 k->user_creatable = false; 520 } 521 522 static void pl181_bus_class_init(ObjectClass *klass, void *data) 523 { 524 SDBusClass *sbc = SD_BUS_CLASS(klass); 525 526 sbc->set_inserted = pl181_set_inserted; 527 sbc->set_readonly = pl181_set_readonly; 528 } 529 530 static const TypeInfo pl181_info[] = { 531 { 532 .name = TYPE_PL181, 533 .parent = TYPE_SYS_BUS_DEVICE, 534 .instance_size = sizeof(PL181State), 535 .instance_init = pl181_init, 536 .class_init = pl181_class_init, 537 }, 538 { 539 .name = TYPE_PL181_BUS, 540 .parent = TYPE_SD_BUS, 541 .instance_size = sizeof(SDBus), 542 .class_init = pl181_bus_class_init, 543 }, 544 }; 545 546 DEFINE_TYPES(pl181_info) 547