1 /* 2 * QEMU model of XGMAC Ethernet. 3 * 4 * derived from the Xilinx AXI-Ethernet by Edgar E. Iglesias. 5 * 6 * Copyright (c) 2011 Calxeda, Inc. 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/irq.h" 29 #include "hw/qdev-properties.h" 30 #include "hw/sysbus.h" 31 #include "migration/vmstate.h" 32 #include "qemu/log.h" 33 #include "qemu/module.h" 34 #include "net/net.h" 35 #include "qom/object.h" 36 37 #ifdef DEBUG_XGMAC 38 #define DEBUGF_BRK(message, args...) do { \ 39 fprintf(stderr, (message), ## args); \ 40 } while (0) 41 #else 42 #define DEBUGF_BRK(message, args...) do { } while (0) 43 #endif 44 45 #define XGMAC_CONTROL 0x00000000 /* MAC Configuration */ 46 #define XGMAC_FRAME_FILTER 0x00000001 /* MAC Frame Filter */ 47 #define XGMAC_FLOW_CTRL 0x00000006 /* MAC Flow Control */ 48 #define XGMAC_VLAN_TAG 0x00000007 /* VLAN Tags */ 49 #define XGMAC_VERSION 0x00000008 /* Version */ 50 /* VLAN tag for insertion or replacement into tx frames */ 51 #define XGMAC_VLAN_INCL 0x00000009 52 #define XGMAC_LPI_CTRL 0x0000000a /* LPI Control and Status */ 53 #define XGMAC_LPI_TIMER 0x0000000b /* LPI Timers Control */ 54 #define XGMAC_TX_PACE 0x0000000c /* Transmit Pace and Stretch */ 55 #define XGMAC_VLAN_HASH 0x0000000d /* VLAN Hash Table */ 56 #define XGMAC_DEBUG 0x0000000e /* Debug */ 57 #define XGMAC_INT_STATUS 0x0000000f /* Interrupt and Control */ 58 /* HASH table registers */ 59 #define XGMAC_HASH(n) ((0x00000300/4) + (n)) 60 #define XGMAC_NUM_HASH 16 61 /* Operation Mode */ 62 #define XGMAC_OPMODE (0x00000400/4) 63 /* Remote Wake-Up Frame Filter */ 64 #define XGMAC_REMOTE_WAKE (0x00000700/4) 65 /* PMT Control and Status */ 66 #define XGMAC_PMT (0x00000704/4) 67 68 #define XGMAC_ADDR_HIGH(reg) (0x00000010+((reg) * 2)) 69 #define XGMAC_ADDR_LOW(reg) (0x00000011+((reg) * 2)) 70 71 #define DMA_BUS_MODE 0x000003c0 /* Bus Mode */ 72 #define DMA_XMT_POLL_DEMAND 0x000003c1 /* Transmit Poll Demand */ 73 #define DMA_RCV_POLL_DEMAND 0x000003c2 /* Received Poll Demand */ 74 #define DMA_RCV_BASE_ADDR 0x000003c3 /* Receive List Base */ 75 #define DMA_TX_BASE_ADDR 0x000003c4 /* Transmit List Base */ 76 #define DMA_STATUS 0x000003c5 /* Status Register */ 77 #define DMA_CONTROL 0x000003c6 /* Ctrl (Operational Mode) */ 78 #define DMA_INTR_ENA 0x000003c7 /* Interrupt Enable */ 79 #define DMA_MISSED_FRAME_CTR 0x000003c8 /* Missed Frame Counter */ 80 /* Receive Interrupt Watchdog Timer */ 81 #define DMA_RI_WATCHDOG_TIMER 0x000003c9 82 #define DMA_AXI_BUS 0x000003ca /* AXI Bus Mode */ 83 #define DMA_AXI_STATUS 0x000003cb /* AXI Status */ 84 #define DMA_CUR_TX_DESC_ADDR 0x000003d2 /* Current Host Tx Descriptor */ 85 #define DMA_CUR_RX_DESC_ADDR 0x000003d3 /* Current Host Rx Descriptor */ 86 #define DMA_CUR_TX_BUF_ADDR 0x000003d4 /* Current Host Tx Buffer */ 87 #define DMA_CUR_RX_BUF_ADDR 0x000003d5 /* Current Host Rx Buffer */ 88 #define DMA_HW_FEATURE 0x000003d6 /* Enabled Hardware Features */ 89 90 /* DMA Status register defines */ 91 #define DMA_STATUS_GMI 0x08000000 /* MMC interrupt */ 92 #define DMA_STATUS_GLI 0x04000000 /* GMAC Line interface int */ 93 #define DMA_STATUS_EB_MASK 0x00380000 /* Error Bits Mask */ 94 #define DMA_STATUS_EB_TX_ABORT 0x00080000 /* Error Bits - TX Abort */ 95 #define DMA_STATUS_EB_RX_ABORT 0x00100000 /* Error Bits - RX Abort */ 96 #define DMA_STATUS_TS_MASK 0x00700000 /* Transmit Process State */ 97 #define DMA_STATUS_TS_SHIFT 20 98 #define DMA_STATUS_RS_MASK 0x000e0000 /* Receive Process State */ 99 #define DMA_STATUS_RS_SHIFT 17 100 #define DMA_STATUS_NIS 0x00010000 /* Normal Interrupt Summary */ 101 #define DMA_STATUS_AIS 0x00008000 /* Abnormal Interrupt Summary */ 102 #define DMA_STATUS_ERI 0x00004000 /* Early Receive Interrupt */ 103 #define DMA_STATUS_FBI 0x00002000 /* Fatal Bus Error Interrupt */ 104 #define DMA_STATUS_ETI 0x00000400 /* Early Transmit Interrupt */ 105 #define DMA_STATUS_RWT 0x00000200 /* Receive Watchdog Timeout */ 106 #define DMA_STATUS_RPS 0x00000100 /* Receive Process Stopped */ 107 #define DMA_STATUS_RU 0x00000080 /* Receive Buffer Unavailable */ 108 #define DMA_STATUS_RI 0x00000040 /* Receive Interrupt */ 109 #define DMA_STATUS_UNF 0x00000020 /* Transmit Underflow */ 110 #define DMA_STATUS_OVF 0x00000010 /* Receive Overflow */ 111 #define DMA_STATUS_TJT 0x00000008 /* Transmit Jabber Timeout */ 112 #define DMA_STATUS_TU 0x00000004 /* Transmit Buffer Unavailable */ 113 #define DMA_STATUS_TPS 0x00000002 /* Transmit Process Stopped */ 114 #define DMA_STATUS_TI 0x00000001 /* Transmit Interrupt */ 115 116 /* DMA Control register defines */ 117 #define DMA_CONTROL_ST 0x00002000 /* Start/Stop Transmission */ 118 #define DMA_CONTROL_SR 0x00000002 /* Start/Stop Receive */ 119 #define DMA_CONTROL_DFF 0x01000000 /* Disable flush of rx frames */ 120 121 struct desc { 122 uint32_t ctl_stat; 123 uint16_t buffer1_size; 124 uint16_t buffer2_size; 125 uint32_t buffer1_addr; 126 uint32_t buffer2_addr; 127 uint32_t ext_stat; 128 uint32_t res[3]; 129 }; 130 131 #define R_MAX 0x400 132 133 typedef struct RxTxStats { 134 uint64_t rx_bytes; 135 uint64_t tx_bytes; 136 137 uint64_t rx; 138 uint64_t rx_bcast; 139 uint64_t rx_mcast; 140 } RxTxStats; 141 142 #define TYPE_XGMAC "xgmac" 143 OBJECT_DECLARE_SIMPLE_TYPE(XgmacState, XGMAC) 144 145 struct XgmacState { 146 SysBusDevice parent_obj; 147 148 MemoryRegion iomem; 149 qemu_irq sbd_irq; 150 qemu_irq pmt_irq; 151 qemu_irq mci_irq; 152 NICState *nic; 153 NICConf conf; 154 155 struct RxTxStats stats; 156 uint32_t regs[R_MAX]; 157 }; 158 159 static const VMStateDescription vmstate_rxtx_stats = { 160 .name = "xgmac_stats", 161 .version_id = 1, 162 .minimum_version_id = 1, 163 .fields = (VMStateField[]) { 164 VMSTATE_UINT64(rx_bytes, RxTxStats), 165 VMSTATE_UINT64(tx_bytes, RxTxStats), 166 VMSTATE_UINT64(rx, RxTxStats), 167 VMSTATE_UINT64(rx_bcast, RxTxStats), 168 VMSTATE_UINT64(rx_mcast, RxTxStats), 169 VMSTATE_END_OF_LIST() 170 } 171 }; 172 173 static const VMStateDescription vmstate_xgmac = { 174 .name = "xgmac", 175 .version_id = 1, 176 .minimum_version_id = 1, 177 .fields = (VMStateField[]) { 178 VMSTATE_STRUCT(stats, XgmacState, 0, vmstate_rxtx_stats, RxTxStats), 179 VMSTATE_UINT32_ARRAY(regs, XgmacState, R_MAX), 180 VMSTATE_END_OF_LIST() 181 } 182 }; 183 184 static void xgmac_read_desc(XgmacState *s, struct desc *d, int rx) 185 { 186 uint32_t addr = rx ? s->regs[DMA_CUR_RX_DESC_ADDR] : 187 s->regs[DMA_CUR_TX_DESC_ADDR]; 188 cpu_physical_memory_read(addr, d, sizeof(*d)); 189 } 190 191 static void xgmac_write_desc(XgmacState *s, struct desc *d, int rx) 192 { 193 int reg = rx ? DMA_CUR_RX_DESC_ADDR : DMA_CUR_TX_DESC_ADDR; 194 uint32_t addr = s->regs[reg]; 195 196 if (!rx && (d->ctl_stat & 0x00200000)) { 197 s->regs[reg] = s->regs[DMA_TX_BASE_ADDR]; 198 } else if (rx && (d->buffer1_size & 0x8000)) { 199 s->regs[reg] = s->regs[DMA_RCV_BASE_ADDR]; 200 } else { 201 s->regs[reg] += sizeof(*d); 202 } 203 cpu_physical_memory_write(addr, d, sizeof(*d)); 204 } 205 206 static void xgmac_enet_send(XgmacState *s) 207 { 208 struct desc bd; 209 int frame_size; 210 int len; 211 uint8_t frame[8192]; 212 uint8_t *ptr; 213 214 ptr = frame; 215 frame_size = 0; 216 while (1) { 217 xgmac_read_desc(s, &bd, 0); 218 if ((bd.ctl_stat & 0x80000000) == 0) { 219 /* Run out of descriptors to transmit. */ 220 break; 221 } 222 len = (bd.buffer1_size & 0xfff) + (bd.buffer2_size & 0xfff); 223 224 /* 225 * FIXME: these cases of malformed tx descriptors (bad sizes) 226 * should probably be reported back to the guest somehow 227 * rather than simply silently stopping processing, but we 228 * don't know what the hardware does in this situation. 229 * This will only happen for buggy guests anyway. 230 */ 231 if ((bd.buffer1_size & 0xfff) > 2048) { 232 DEBUGF_BRK("qemu:%s:ERROR...ERROR...ERROR... -- " 233 "xgmac buffer 1 len on send > 2048 (0x%x)\n", 234 __func__, bd.buffer1_size & 0xfff); 235 break; 236 } 237 if ((bd.buffer2_size & 0xfff) != 0) { 238 DEBUGF_BRK("qemu:%s:ERROR...ERROR...ERROR... -- " 239 "xgmac buffer 2 len on send != 0 (0x%x)\n", 240 __func__, bd.buffer2_size & 0xfff); 241 break; 242 } 243 if (frame_size + len >= sizeof(frame)) { 244 DEBUGF_BRK("qemu:%s: buffer overflow %d read into %zu " 245 "buffer\n" , __func__, frame_size + len, sizeof(frame)); 246 DEBUGF_BRK("qemu:%s: buffer1.size=%d; buffer2.size=%d\n", 247 __func__, bd.buffer1_size, bd.buffer2_size); 248 break; 249 } 250 251 cpu_physical_memory_read(bd.buffer1_addr, ptr, len); 252 ptr += len; 253 frame_size += len; 254 if (bd.ctl_stat & 0x20000000) { 255 /* Last buffer in frame. */ 256 qemu_send_packet(qemu_get_queue(s->nic), frame, len); 257 ptr = frame; 258 frame_size = 0; 259 s->regs[DMA_STATUS] |= DMA_STATUS_TI | DMA_STATUS_NIS; 260 } 261 bd.ctl_stat &= ~0x80000000; 262 /* Write back the modified descriptor. */ 263 xgmac_write_desc(s, &bd, 0); 264 } 265 } 266 267 static void enet_update_irq(XgmacState *s) 268 { 269 int stat = s->regs[DMA_STATUS] & s->regs[DMA_INTR_ENA]; 270 qemu_set_irq(s->sbd_irq, !!stat); 271 } 272 273 static uint64_t enet_read(void *opaque, hwaddr addr, unsigned size) 274 { 275 XgmacState *s = opaque; 276 uint64_t r = 0; 277 addr >>= 2; 278 279 switch (addr) { 280 case XGMAC_VERSION: 281 r = 0x1012; 282 break; 283 default: 284 if (addr < ARRAY_SIZE(s->regs)) { 285 r = s->regs[addr]; 286 } 287 break; 288 } 289 return r; 290 } 291 292 static void enet_write(void *opaque, hwaddr addr, 293 uint64_t value, unsigned size) 294 { 295 XgmacState *s = opaque; 296 297 addr >>= 2; 298 switch (addr) { 299 case DMA_BUS_MODE: 300 s->regs[DMA_BUS_MODE] = value & ~0x1; 301 break; 302 case DMA_XMT_POLL_DEMAND: 303 xgmac_enet_send(s); 304 break; 305 case DMA_STATUS: 306 s->regs[DMA_STATUS] = s->regs[DMA_STATUS] & ~value; 307 break; 308 case DMA_RCV_BASE_ADDR: 309 s->regs[DMA_RCV_BASE_ADDR] = s->regs[DMA_CUR_RX_DESC_ADDR] = value; 310 break; 311 case DMA_TX_BASE_ADDR: 312 s->regs[DMA_TX_BASE_ADDR] = s->regs[DMA_CUR_TX_DESC_ADDR] = value; 313 break; 314 default: 315 if (addr < ARRAY_SIZE(s->regs)) { 316 s->regs[addr] = value; 317 } 318 break; 319 } 320 enet_update_irq(s); 321 } 322 323 static const MemoryRegionOps enet_mem_ops = { 324 .read = enet_read, 325 .write = enet_write, 326 .endianness = DEVICE_LITTLE_ENDIAN, 327 }; 328 329 static int eth_can_rx(XgmacState *s) 330 { 331 /* RX enabled? */ 332 return s->regs[DMA_CONTROL] & DMA_CONTROL_SR; 333 } 334 335 static ssize_t eth_rx(NetClientState *nc, const uint8_t *buf, size_t size) 336 { 337 XgmacState *s = qemu_get_nic_opaque(nc); 338 static const unsigned char sa_bcast[6] = {0xff, 0xff, 0xff, 339 0xff, 0xff, 0xff}; 340 int unicast, broadcast, multicast; 341 struct desc bd; 342 ssize_t ret; 343 344 if (!eth_can_rx(s)) { 345 return -1; 346 } 347 unicast = ~buf[0] & 0x1; 348 broadcast = memcmp(buf, sa_bcast, 6) == 0; 349 multicast = !unicast && !broadcast; 350 if (size < 12) { 351 s->regs[DMA_STATUS] |= DMA_STATUS_RI | DMA_STATUS_NIS; 352 ret = -1; 353 goto out; 354 } 355 356 xgmac_read_desc(s, &bd, 1); 357 if ((bd.ctl_stat & 0x80000000) == 0) { 358 s->regs[DMA_STATUS] |= DMA_STATUS_RU | DMA_STATUS_AIS; 359 ret = size; 360 goto out; 361 } 362 363 cpu_physical_memory_write(bd.buffer1_addr, buf, size); 364 365 /* Add in the 4 bytes for crc (the real hw returns length incl crc) */ 366 size += 4; 367 bd.ctl_stat = (size << 16) | 0x300; 368 xgmac_write_desc(s, &bd, 1); 369 370 s->stats.rx_bytes += size; 371 s->stats.rx++; 372 if (multicast) { 373 s->stats.rx_mcast++; 374 } else if (broadcast) { 375 s->stats.rx_bcast++; 376 } 377 378 s->regs[DMA_STATUS] |= DMA_STATUS_RI | DMA_STATUS_NIS; 379 ret = size; 380 381 out: 382 enet_update_irq(s); 383 return ret; 384 } 385 386 static NetClientInfo net_xgmac_enet_info = { 387 .type = NET_CLIENT_DRIVER_NIC, 388 .size = sizeof(NICState), 389 .receive = eth_rx, 390 }; 391 392 static void xgmac_enet_realize(DeviceState *dev, Error **errp) 393 { 394 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 395 XgmacState *s = XGMAC(dev); 396 397 memory_region_init_io(&s->iomem, OBJECT(s), &enet_mem_ops, s, 398 "xgmac", 0x1000); 399 sysbus_init_mmio(sbd, &s->iomem); 400 sysbus_init_irq(sbd, &s->sbd_irq); 401 sysbus_init_irq(sbd, &s->pmt_irq); 402 sysbus_init_irq(sbd, &s->mci_irq); 403 404 qemu_macaddr_default_if_unset(&s->conf.macaddr); 405 s->nic = qemu_new_nic(&net_xgmac_enet_info, &s->conf, 406 object_get_typename(OBJECT(dev)), dev->id, s); 407 qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a); 408 409 s->regs[XGMAC_ADDR_HIGH(0)] = (s->conf.macaddr.a[5] << 8) | 410 s->conf.macaddr.a[4]; 411 s->regs[XGMAC_ADDR_LOW(0)] = (s->conf.macaddr.a[3] << 24) | 412 (s->conf.macaddr.a[2] << 16) | 413 (s->conf.macaddr.a[1] << 8) | 414 s->conf.macaddr.a[0]; 415 } 416 417 static Property xgmac_properties[] = { 418 DEFINE_NIC_PROPERTIES(XgmacState, conf), 419 DEFINE_PROP_END_OF_LIST(), 420 }; 421 422 static void xgmac_enet_class_init(ObjectClass *klass, void *data) 423 { 424 DeviceClass *dc = DEVICE_CLASS(klass); 425 426 dc->realize = xgmac_enet_realize; 427 dc->vmsd = &vmstate_xgmac; 428 device_class_set_props(dc, xgmac_properties); 429 } 430 431 static const TypeInfo xgmac_enet_info = { 432 .name = TYPE_XGMAC, 433 .parent = TYPE_SYS_BUS_DEVICE, 434 .instance_size = sizeof(XgmacState), 435 .class_init = xgmac_enet_class_init, 436 }; 437 438 static void xgmac_enet_register_types(void) 439 { 440 type_register_static(&xgmac_enet_info); 441 } 442 443 type_init(xgmac_enet_register_types) 444