hw/net/xgmac.c

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