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