stellaris_enet.c (15374B)
1 /* 2 * Luminary Micro Stellaris Ethernet Controller 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 "hw/irq.h" 12 #include "hw/qdev-properties.h" 13 #include "hw/sysbus.h" 14 #include "migration/vmstate.h" 15 #include "net/net.h" 16 #include "qemu/log.h" 17 #include "qemu/module.h" 18 #include <zlib.h> 19 #include "qom/object.h" 20 21 //#define DEBUG_STELLARIS_ENET 1 22 23 #ifdef DEBUG_STELLARIS_ENET 24 #define DPRINTF(fmt, ...) \ 25 do { printf("stellaris_enet: " fmt , ## __VA_ARGS__); } while (0) 26 #define BADF(fmt, ...) \ 27 do { fprintf(stderr, "stellaris_enet: error: " fmt , ## __VA_ARGS__); exit(1);} while (0) 28 #else 29 #define DPRINTF(fmt, ...) do {} while(0) 30 #define BADF(fmt, ...) \ 31 do { fprintf(stderr, "stellaris_enet: error: " fmt , ## __VA_ARGS__);} while (0) 32 #endif 33 34 #define SE_INT_RX 0x01 35 #define SE_INT_TXER 0x02 36 #define SE_INT_TXEMP 0x04 37 #define SE_INT_FOV 0x08 38 #define SE_INT_RXER 0x10 39 #define SE_INT_MD 0x20 40 #define SE_INT_PHY 0x40 41 42 #define SE_RCTL_RXEN 0x01 43 #define SE_RCTL_AMUL 0x02 44 #define SE_RCTL_PRMS 0x04 45 #define SE_RCTL_BADCRC 0x08 46 #define SE_RCTL_RSTFIFO 0x10 47 48 #define SE_TCTL_TXEN 0x01 49 #define SE_TCTL_PADEN 0x02 50 #define SE_TCTL_CRC 0x04 51 #define SE_TCTL_DUPLEX 0x08 52 53 #define TYPE_STELLARIS_ENET "stellaris_enet" 54 OBJECT_DECLARE_SIMPLE_TYPE(stellaris_enet_state, STELLARIS_ENET) 55 56 typedef struct { 57 uint8_t data[2048]; 58 uint32_t len; 59 } StellarisEnetRxFrame; 60 61 struct stellaris_enet_state { 62 SysBusDevice parent_obj; 63 64 uint32_t ris; 65 uint32_t im; 66 uint32_t rctl; 67 uint32_t tctl; 68 uint32_t thr; 69 uint32_t mctl; 70 uint32_t mdv; 71 uint32_t mtxd; 72 uint32_t mrxd; 73 uint32_t np; 74 uint32_t tx_fifo_len; 75 uint8_t tx_fifo[2048]; 76 /* Real hardware has a 2k fifo, which works out to be at most 31 packets. 77 We implement a full 31 packet fifo. */ 78 StellarisEnetRxFrame rx[31]; 79 uint32_t rx_fifo_offset; 80 uint32_t next_packet; 81 NICState *nic; 82 NICConf conf; 83 qemu_irq irq; 84 MemoryRegion mmio; 85 }; 86 87 static const VMStateDescription vmstate_rx_frame = { 88 .name = "stellaris_enet/rx_frame", 89 .version_id = 1, 90 .minimum_version_id = 1, 91 .fields = (VMStateField[]) { 92 VMSTATE_UINT8_ARRAY(data, StellarisEnetRxFrame, 2048), 93 VMSTATE_UINT32(len, StellarisEnetRxFrame), 94 VMSTATE_END_OF_LIST() 95 } 96 }; 97 98 static int stellaris_enet_post_load(void *opaque, int version_id) 99 { 100 stellaris_enet_state *s = opaque; 101 int i; 102 103 /* Sanitize inbound state. Note that next_packet is an index but 104 * np is a size; hence their valid upper bounds differ. 105 */ 106 if (s->next_packet >= ARRAY_SIZE(s->rx)) { 107 return -1; 108 } 109 110 if (s->np > ARRAY_SIZE(s->rx)) { 111 return -1; 112 } 113 114 for (i = 0; i < ARRAY_SIZE(s->rx); i++) { 115 if (s->rx[i].len > ARRAY_SIZE(s->rx[i].data)) { 116 return -1; 117 } 118 } 119 120 if (s->rx_fifo_offset > ARRAY_SIZE(s->rx[0].data) - 4) { 121 return -1; 122 } 123 124 if (s->tx_fifo_len > ARRAY_SIZE(s->tx_fifo)) { 125 return -1; 126 } 127 128 return 0; 129 } 130 131 static const VMStateDescription vmstate_stellaris_enet = { 132 .name = "stellaris_enet", 133 .version_id = 2, 134 .minimum_version_id = 2, 135 .post_load = stellaris_enet_post_load, 136 .fields = (VMStateField[]) { 137 VMSTATE_UINT32(ris, stellaris_enet_state), 138 VMSTATE_UINT32(im, stellaris_enet_state), 139 VMSTATE_UINT32(rctl, stellaris_enet_state), 140 VMSTATE_UINT32(tctl, stellaris_enet_state), 141 VMSTATE_UINT32(thr, stellaris_enet_state), 142 VMSTATE_UINT32(mctl, stellaris_enet_state), 143 VMSTATE_UINT32(mdv, stellaris_enet_state), 144 VMSTATE_UINT32(mtxd, stellaris_enet_state), 145 VMSTATE_UINT32(mrxd, stellaris_enet_state), 146 VMSTATE_UINT32(np, stellaris_enet_state), 147 VMSTATE_UINT32(tx_fifo_len, stellaris_enet_state), 148 VMSTATE_UINT8_ARRAY(tx_fifo, stellaris_enet_state, 2048), 149 VMSTATE_STRUCT_ARRAY(rx, stellaris_enet_state, 31, 1, 150 vmstate_rx_frame, StellarisEnetRxFrame), 151 VMSTATE_UINT32(rx_fifo_offset, stellaris_enet_state), 152 VMSTATE_UINT32(next_packet, stellaris_enet_state), 153 VMSTATE_END_OF_LIST() 154 } 155 }; 156 157 static void stellaris_enet_update(stellaris_enet_state *s) 158 { 159 qemu_set_irq(s->irq, (s->ris & s->im) != 0); 160 } 161 162 /* Return the data length of the packet currently being assembled 163 * in the TX fifo. 164 */ 165 static inline int stellaris_txpacket_datalen(stellaris_enet_state *s) 166 { 167 return s->tx_fifo[0] | (s->tx_fifo[1] << 8); 168 } 169 170 /* Return true if the packet currently in the TX FIFO is complete, 171 * ie the FIFO holds enough bytes for the data length, ethernet header, 172 * payload and optionally CRC. 173 */ 174 static inline bool stellaris_txpacket_complete(stellaris_enet_state *s) 175 { 176 int framelen = stellaris_txpacket_datalen(s); 177 framelen += 16; 178 if (!(s->tctl & SE_TCTL_CRC)) { 179 framelen += 4; 180 } 181 /* Cover the corner case of a 2032 byte payload with auto-CRC disabled: 182 * this requires more bytes than will fit in the FIFO. It's not totally 183 * clear how the h/w handles this, but if using threshold-based TX 184 * it will definitely try to transmit something. 185 */ 186 framelen = MIN(framelen, ARRAY_SIZE(s->tx_fifo)); 187 return s->tx_fifo_len >= framelen; 188 } 189 190 /* Return true if the TX FIFO threshold is enabled and the FIFO 191 * has filled enough to reach it. 192 */ 193 static inline bool stellaris_tx_thr_reached(stellaris_enet_state *s) 194 { 195 return (s->thr < 0x3f && 196 (s->tx_fifo_len >= 4 * (s->thr * 8 + 1))); 197 } 198 199 /* Send the packet currently in the TX FIFO */ 200 static void stellaris_enet_send(stellaris_enet_state *s) 201 { 202 int framelen = stellaris_txpacket_datalen(s); 203 204 /* Ethernet header is in the FIFO but not in the datacount. 205 * We don't implement explicit CRC, so just ignore any 206 * CRC value in the FIFO. 207 */ 208 framelen += 14; 209 if ((s->tctl & SE_TCTL_PADEN) && framelen < 60) { 210 memset(&s->tx_fifo[framelen + 2], 0, 60 - framelen); 211 framelen = 60; 212 } 213 /* This MIN will have no effect unless the FIFO data is corrupt 214 * (eg bad data from an incoming migration); otherwise the check 215 * on the datalen at the start of writing the data into the FIFO 216 * will have caught this. Silently write a corrupt half-packet, 217 * which is what the hardware does in FIFO underrun situations. 218 */ 219 framelen = MIN(framelen, ARRAY_SIZE(s->tx_fifo) - 2); 220 qemu_send_packet(qemu_get_queue(s->nic), s->tx_fifo + 2, framelen); 221 s->tx_fifo_len = 0; 222 s->ris |= SE_INT_TXEMP; 223 stellaris_enet_update(s); 224 DPRINTF("Done TX\n"); 225 } 226 227 /* TODO: Implement MAC address filtering. */ 228 static ssize_t stellaris_enet_receive(NetClientState *nc, const uint8_t *buf, size_t size) 229 { 230 stellaris_enet_state *s = qemu_get_nic_opaque(nc); 231 int n; 232 uint8_t *p; 233 uint32_t crc; 234 235 if ((s->rctl & SE_RCTL_RXEN) == 0) 236 return -1; 237 if (s->np >= 31) { 238 return 0; 239 } 240 241 DPRINTF("Received packet len=%zu\n", size); 242 n = s->next_packet + s->np; 243 if (n >= 31) 244 n -= 31; 245 246 if (size >= sizeof(s->rx[n].data) - 6) { 247 /* If the packet won't fit into the 248 * emulated 2K RAM, this is reported 249 * as a FIFO overrun error. 250 */ 251 s->ris |= SE_INT_FOV; 252 stellaris_enet_update(s); 253 return -1; 254 } 255 256 s->np++; 257 s->rx[n].len = size + 6; 258 p = s->rx[n].data; 259 *(p++) = (size + 6); 260 *(p++) = (size + 6) >> 8; 261 memcpy (p, buf, size); 262 p += size; 263 crc = crc32(~0, buf, size); 264 *(p++) = crc; 265 *(p++) = crc >> 8; 266 *(p++) = crc >> 16; 267 *(p++) = crc >> 24; 268 /* Clear the remaining bytes in the last word. */ 269 if ((size & 3) != 2) { 270 memset(p, 0, (6 - size) & 3); 271 } 272 273 s->ris |= SE_INT_RX; 274 stellaris_enet_update(s); 275 276 return size; 277 } 278 279 static int stellaris_enet_can_receive(stellaris_enet_state *s) 280 { 281 return (s->np < 31); 282 } 283 284 static uint64_t stellaris_enet_read(void *opaque, hwaddr offset, 285 unsigned size) 286 { 287 stellaris_enet_state *s = (stellaris_enet_state *)opaque; 288 uint32_t val; 289 290 switch (offset) { 291 case 0x00: /* RIS */ 292 DPRINTF("IRQ status %02x\n", s->ris); 293 return s->ris; 294 case 0x04: /* IM */ 295 return s->im; 296 case 0x08: /* RCTL */ 297 return s->rctl; 298 case 0x0c: /* TCTL */ 299 return s->tctl; 300 case 0x10: /* DATA */ 301 { 302 uint8_t *rx_fifo; 303 304 if (s->np == 0) { 305 BADF("RX underflow\n"); 306 return 0; 307 } 308 309 rx_fifo = s->rx[s->next_packet].data + s->rx_fifo_offset; 310 311 val = rx_fifo[0] | (rx_fifo[1] << 8) | (rx_fifo[2] << 16) 312 | (rx_fifo[3] << 24); 313 s->rx_fifo_offset += 4; 314 if (s->rx_fifo_offset >= s->rx[s->next_packet].len) { 315 s->rx_fifo_offset = 0; 316 s->next_packet++; 317 if (s->next_packet >= 31) 318 s->next_packet = 0; 319 s->np--; 320 DPRINTF("RX done np=%d\n", s->np); 321 if (!s->np && stellaris_enet_can_receive(s)) { 322 qemu_flush_queued_packets(qemu_get_queue(s->nic)); 323 } 324 } 325 return val; 326 } 327 case 0x14: /* IA0 */ 328 return s->conf.macaddr.a[0] | (s->conf.macaddr.a[1] << 8) 329 | (s->conf.macaddr.a[2] << 16) 330 | ((uint32_t)s->conf.macaddr.a[3] << 24); 331 case 0x18: /* IA1 */ 332 return s->conf.macaddr.a[4] | (s->conf.macaddr.a[5] << 8); 333 case 0x1c: /* THR */ 334 return s->thr; 335 case 0x20: /* MCTL */ 336 return s->mctl; 337 case 0x24: /* MDV */ 338 return s->mdv; 339 case 0x28: /* MADD */ 340 return 0; 341 case 0x2c: /* MTXD */ 342 return s->mtxd; 343 case 0x30: /* MRXD */ 344 return s->mrxd; 345 case 0x34: /* NP */ 346 return s->np; 347 case 0x38: /* TR */ 348 return 0; 349 case 0x3c: /* Undocumented: Timestamp? */ 350 return 0; 351 default: 352 qemu_log_mask(LOG_GUEST_ERROR, "stellaris_enet_rd%d: Illegal register" 353 " 0x02%" HWADDR_PRIx "\n", 354 size * 8, offset); 355 return 0; 356 } 357 } 358 359 static void stellaris_enet_write(void *opaque, hwaddr offset, 360 uint64_t value, unsigned size) 361 { 362 stellaris_enet_state *s = (stellaris_enet_state *)opaque; 363 364 switch (offset) { 365 case 0x00: /* IACK */ 366 s->ris &= ~value; 367 DPRINTF("IRQ ack %02" PRIx64 "/%02x\n", value, s->ris); 368 stellaris_enet_update(s); 369 /* Clearing TXER also resets the TX fifo. */ 370 if (value & SE_INT_TXER) { 371 s->tx_fifo_len = 0; 372 } 373 break; 374 case 0x04: /* IM */ 375 DPRINTF("IRQ mask %02" PRIx64 "/%02x\n", value, s->ris); 376 s->im = value; 377 stellaris_enet_update(s); 378 break; 379 case 0x08: /* RCTL */ 380 s->rctl = value; 381 if (value & SE_RCTL_RSTFIFO) { 382 s->np = 0; 383 s->rx_fifo_offset = 0; 384 stellaris_enet_update(s); 385 } 386 break; 387 case 0x0c: /* TCTL */ 388 s->tctl = value; 389 break; 390 case 0x10: /* DATA */ 391 if (s->tx_fifo_len == 0) { 392 /* The first word is special, it contains the data length */ 393 int framelen = value & 0xffff; 394 if (framelen > 2032) { 395 DPRINTF("TX frame too long (%d)\n", framelen); 396 s->ris |= SE_INT_TXER; 397 stellaris_enet_update(s); 398 break; 399 } 400 } 401 402 if (s->tx_fifo_len + 4 <= ARRAY_SIZE(s->tx_fifo)) { 403 s->tx_fifo[s->tx_fifo_len++] = value; 404 s->tx_fifo[s->tx_fifo_len++] = value >> 8; 405 s->tx_fifo[s->tx_fifo_len++] = value >> 16; 406 s->tx_fifo[s->tx_fifo_len++] = value >> 24; 407 } 408 409 if (stellaris_tx_thr_reached(s) && stellaris_txpacket_complete(s)) { 410 stellaris_enet_send(s); 411 } 412 break; 413 case 0x14: /* IA0 */ 414 s->conf.macaddr.a[0] = value; 415 s->conf.macaddr.a[1] = value >> 8; 416 s->conf.macaddr.a[2] = value >> 16; 417 s->conf.macaddr.a[3] = value >> 24; 418 break; 419 case 0x18: /* IA1 */ 420 s->conf.macaddr.a[4] = value; 421 s->conf.macaddr.a[5] = value >> 8; 422 break; 423 case 0x1c: /* THR */ 424 s->thr = value; 425 break; 426 case 0x20: /* MCTL */ 427 /* TODO: MII registers aren't modelled. 428 * Clear START, indicating that the operation completes immediately. 429 */ 430 s->mctl = value & ~1; 431 break; 432 case 0x24: /* MDV */ 433 s->mdv = value; 434 break; 435 case 0x28: /* MADD */ 436 /* ignored. */ 437 break; 438 case 0x2c: /* MTXD */ 439 s->mtxd = value & 0xff; 440 break; 441 case 0x38: /* TR */ 442 if (value & 1) { 443 stellaris_enet_send(s); 444 } 445 break; 446 case 0x30: /* MRXD */ 447 case 0x34: /* NP */ 448 /* Ignored. */ 449 case 0x3c: /* Undocuented: Timestamp? */ 450 /* Ignored. */ 451 break; 452 default: 453 qemu_log_mask(LOG_GUEST_ERROR, "stellaris_enet_wr%d: Illegal register " 454 "0x02%" HWADDR_PRIx " = 0x%" PRIx64 "\n", 455 size * 8, offset, value); 456 } 457 } 458 459 static const MemoryRegionOps stellaris_enet_ops = { 460 .read = stellaris_enet_read, 461 .write = stellaris_enet_write, 462 .endianness = DEVICE_NATIVE_ENDIAN, 463 }; 464 465 static void stellaris_enet_reset(DeviceState *dev) 466 { 467 stellaris_enet_state *s = STELLARIS_ENET(dev); 468 469 s->mdv = 0x80; 470 s->rctl = SE_RCTL_BADCRC; 471 s->im = SE_INT_PHY | SE_INT_MD | SE_INT_RXER | SE_INT_FOV | SE_INT_TXEMP 472 | SE_INT_TXER | SE_INT_RX; 473 s->thr = 0x3f; 474 s->tx_fifo_len = 0; 475 } 476 477 static NetClientInfo net_stellaris_enet_info = { 478 .type = NET_CLIENT_DRIVER_NIC, 479 .size = sizeof(NICState), 480 .receive = stellaris_enet_receive, 481 }; 482 483 static void stellaris_enet_realize(DeviceState *dev, Error **errp) 484 { 485 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 486 stellaris_enet_state *s = STELLARIS_ENET(dev); 487 488 memory_region_init_io(&s->mmio, OBJECT(s), &stellaris_enet_ops, s, 489 "stellaris_enet", 0x1000); 490 sysbus_init_mmio(sbd, &s->mmio); 491 sysbus_init_irq(sbd, &s->irq); 492 qemu_macaddr_default_if_unset(&s->conf.macaddr); 493 494 s->nic = qemu_new_nic(&net_stellaris_enet_info, &s->conf, 495 object_get_typename(OBJECT(dev)), dev->id, s); 496 qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a); 497 } 498 499 static Property stellaris_enet_properties[] = { 500 DEFINE_NIC_PROPERTIES(stellaris_enet_state, conf), 501 DEFINE_PROP_END_OF_LIST(), 502 }; 503 504 static void stellaris_enet_class_init(ObjectClass *klass, void *data) 505 { 506 DeviceClass *dc = DEVICE_CLASS(klass); 507 508 dc->realize = stellaris_enet_realize; 509 dc->reset = stellaris_enet_reset; 510 device_class_set_props(dc, stellaris_enet_properties); 511 dc->vmsd = &vmstate_stellaris_enet; 512 } 513 514 static const TypeInfo stellaris_enet_info = { 515 .name = TYPE_STELLARIS_ENET, 516 .parent = TYPE_SYS_BUS_DEVICE, 517 .instance_size = sizeof(stellaris_enet_state), 518 .class_init = stellaris_enet_class_init, 519 }; 520 521 static void stellaris_enet_register_types(void) 522 { 523 type_register_static(&stellaris_enet_info); 524 } 525 526 type_init(stellaris_enet_register_types)