hw/net/xilinx_ethlite.c

   1 /*
   2  * QEMU model of the Xilinx Ethernet Lite MAC.
   3  *
   4  * Copyright (c) 2009 Edgar E. Iglesias.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "hw/sysbus.h"
  26 #include "hw/hw.h"
  27 #include "net/net.h"
  28
  29 #define D(x)
  30 #define R_TX_BUF0     0
  31 #define R_TX_LEN0     (0x07f4 / 4)
  32 #define R_TX_GIE0     (0x07f8 / 4)
  33 #define R_TX_CTRL0    (0x07fc / 4)
  34 #define R_TX_BUF1     (0x0800 / 4)
  35 #define R_TX_LEN1     (0x0ff4 / 4)
  36 #define R_TX_CTRL1    (0x0ffc / 4)
  37
  38 #define R_RX_BUF0     (0x1000 / 4)
  39 #define R_RX_CTRL0    (0x17fc / 4)
  40 #define R_RX_BUF1     (0x1800 / 4)
  41 #define R_RX_CTRL1    (0x1ffc / 4)
  42 #define R_MAX         (0x2000 / 4)
  43
  44 #define GIE_GIE    0x80000000
  45
  46 #define CTRL_I     0x8
  47 #define CTRL_P     0x2
  48 #define CTRL_S     0x1
  49
  50 #define TYPE_XILINX_ETHLITE "xlnx.xps-ethernetlite"
  51 #define XILINX_ETHLITE(obj) \
  52     OBJECT_CHECK(struct xlx_ethlite, (obj), TYPE_XILINX_ETHLITE)
  53
  54 struct xlx_ethlite
  55 {
  56     SysBusDevice parent_obj;
  57
  58     MemoryRegion mmio;
  59     qemu_irq irq;
  60     NICState *nic;
  61     NICConf conf;
  62
  63     uint32_t c_tx_pingpong;
  64     uint32_t c_rx_pingpong;
  65     unsigned int txbuf;
  66     unsigned int rxbuf;
  67
  68     uint32_t regs[R_MAX];
  69 };
  70
  71 static inline void eth_pulse_irq(struct xlx_ethlite *s)
  72 {
  73     /* Only the first gie reg is active.  */
  74     if (s->regs[R_TX_GIE0] & GIE_GIE) {
  75         qemu_irq_pulse(s->irq);
  76     }
  77 }
  78
  79 static uint64_t
  80 eth_read(void *opaque, hwaddr addr, unsigned int size)
  81 {
  82     struct xlx_ethlite *s = opaque;
  83     uint32_t r = 0;
  84
  85     addr >>= 2;
  86
  87     switch (addr)
  88     {
  89         case R_TX_GIE0:
  90         case R_TX_LEN0:
  91         case R_TX_LEN1:
  92         case R_TX_CTRL1:
  93         case R_TX_CTRL0:
  94         case R_RX_CTRL1:
  95         case R_RX_CTRL0:
  96             r = s->regs[addr];
  97             D(qemu_log("%s " TARGET_FMT_plx "=%x\n", __func__, addr * 4, r));
  98             break;
  99
 100         default:
 101             r = tswap32(s->regs[addr]);
 102             break;
 103     }
 104     return r;
 105 }
 106
 107 static void
 108 eth_write(void *opaque, hwaddr addr,
 109           uint64_t val64, unsigned int size)
 110 {
 111     struct xlx_ethlite *s = opaque;
 112     unsigned int base = 0;
 113     uint32_t value = val64;
 114
 115     addr >>= 2;
 116     switch (addr)
 117     {
 118         case R_TX_CTRL0:
 119         case R_TX_CTRL1:
 120             if (addr == R_TX_CTRL1)
 121                 base = 0x800 / 4;
 122
 123             D(qemu_log("%s addr=" TARGET_FMT_plx " val=%x\n",
 124                        __func__, addr * 4, value));
 125             if ((value & (CTRL_P | CTRL_S)) == CTRL_S) {
 126                 qemu_send_packet(qemu_get_queue(s->nic),
 127                                  (void *) &s->regs[base],
 128                                  s->regs[base + R_TX_LEN0]);
 129                 D(qemu_log("eth_tx %d\n", s->regs[base + R_TX_LEN0]));
 130                 if (s->regs[base + R_TX_CTRL0] & CTRL_I)
 131                     eth_pulse_irq(s);
 132             } else if ((value & (CTRL_P | CTRL_S)) == (CTRL_P | CTRL_S)) {
 133                 memcpy(&s->conf.macaddr.a[0], &s->regs[base], 6);
 134                 if (s->regs[base + R_TX_CTRL0] & CTRL_I)
 135                     eth_pulse_irq(s);
 136             }
 137
 138             /* We are fast and get ready pretty much immediately so
 139                we actually never flip the S nor P bits to one.  */
 140             s->regs[addr] = value & ~(CTRL_P | CTRL_S);
 141             break;
 142
 143         /* Keep these native.  */
 144         case R_RX_CTRL0:
 145         case R_RX_CTRL1:
 146             if (!(value & CTRL_S)) {
 147                 qemu_flush_queued_packets(qemu_get_queue(s->nic));
 148             }
 149             /* fall through */
 150         case R_TX_LEN0:
 151         case R_TX_LEN1:
 152         case R_TX_GIE0:
 153             D(qemu_log("%s addr=" TARGET_FMT_plx " val=%x\n",
 154                        __func__, addr * 4, value));
 155             s->regs[addr] = value;
 156             break;
 157
 158         default:
 159             s->regs[addr] = tswap32(value);
 160             break;
 161     }
 162 }
 163
 164 static const MemoryRegionOps eth_ops = {
 165     .read = eth_read,
 166     .write = eth_write,
 167     .endianness = DEVICE_NATIVE_ENDIAN,
 168     .valid = {
 169         .min_access_size = 4,
 170         .max_access_size = 4
 171     }
 172 };
 173
 174 static int eth_can_rx(NetClientState *nc)
 175 {
 176     struct xlx_ethlite *s = qemu_get_nic_opaque(nc);
 177     unsigned int rxbase = s->rxbuf * (0x800 / 4);
 178
 179     return !(s->regs[rxbase + R_RX_CTRL0] & CTRL_S);
 180 }
 181
 182 static ssize_t eth_rx(NetClientState *nc, const uint8_t *buf, size_t size)
 183 {
 184     struct xlx_ethlite *s = qemu_get_nic_opaque(nc);
 185     unsigned int rxbase = s->rxbuf * (0x800 / 4);
 186
 187     /* DA filter.  */
 188     if (!(buf[0] & 0x80) && memcmp(&s->conf.macaddr.a[0], buf, 6))
 189         return size;
 190
 191     if (s->regs[rxbase + R_RX_CTRL0] & CTRL_S) {
 192         D(qemu_log("ethlite lost packet %x\n", s->regs[R_RX_CTRL0]));
 193         return -1;
 194     }
 195
 196     D(qemu_log("%s %zd rxbase=%x\n", __func__, size, rxbase));
 197     memcpy(&s->regs[rxbase + R_RX_BUF0], buf, size);
 198
 199     s->regs[rxbase + R_RX_CTRL0] |= CTRL_S;
 200     if (s->regs[R_RX_CTRL0] & CTRL_I) {
 201         eth_pulse_irq(s);
 202     }
 203
 204     /* If c_rx_pingpong was set flip buffers.  */
 205     s->rxbuf ^= s->c_rx_pingpong;
 206     return size;
 207 }
 208
 209 static void xilinx_ethlite_reset(DeviceState *dev)
 210 {
 211     struct xlx_ethlite *s = XILINX_ETHLITE(dev);
 212
 213     s->rxbuf = 0;
 214 }
 215
 216 static NetClientInfo net_xilinx_ethlite_info = {
 217     .type = NET_CLIENT_OPTIONS_KIND_NIC,
 218     .size = sizeof(NICState),
 219     .can_receive = eth_can_rx,
 220     .receive = eth_rx,
 221 };
 222
 223 static void xilinx_ethlite_realize(DeviceState *dev, Error **errp)
 224 {
 225     struct xlx_ethlite *s = XILINX_ETHLITE(dev);
 226
 227     qemu_macaddr_default_if_unset(&s->conf.macaddr);
 228     s->nic = qemu_new_nic(&net_xilinx_ethlite_info, &s->conf,
 229                           object_get_typename(OBJECT(dev)), dev->id, s);
 230     qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
 231 }
 232
 233 static void xilinx_ethlite_init(Object *obj)
 234 {
 235     struct xlx_ethlite *s = XILINX_ETHLITE(obj);
 236
 237     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
 238
 239     memory_region_init_io(&s->mmio, obj, &eth_ops, s,
 240                           "xlnx.xps-ethernetlite", R_MAX * 4);
 241     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
 242 }
 243
 244 static Property xilinx_ethlite_properties[] = {
 245     DEFINE_PROP_UINT32("tx-ping-pong", struct xlx_ethlite, c_tx_pingpong, 1),
 246     DEFINE_PROP_UINT32("rx-ping-pong", struct xlx_ethlite, c_rx_pingpong, 1),
 247     DEFINE_NIC_PROPERTIES(struct xlx_ethlite, conf),
 248     DEFINE_PROP_END_OF_LIST(),
 249 };
 250
 251 static void xilinx_ethlite_class_init(ObjectClass *klass, void *data)
 252 {
 253     DeviceClass *dc = DEVICE_CLASS(klass);
 254
 255     dc->realize = xilinx_ethlite_realize;
 256     dc->reset = xilinx_ethlite_reset;
 257     dc->props = xilinx_ethlite_properties;
 258 }
 259
 260 static const TypeInfo xilinx_ethlite_info = {
 261     .name          = TYPE_XILINX_ETHLITE,
 262     .parent        = TYPE_SYS_BUS_DEVICE,
 263     .instance_size = sizeof(struct xlx_ethlite),
 264     .instance_init = xilinx_ethlite_init,
 265     .class_init    = xilinx_ethlite_class_init,
 266 };
 267
 268 static void xilinx_ethlite_register_types(void)
 269 {
 270     type_register_static(&xilinx_ethlite_info);
 271 }
 272
 273 type_init(xilinx_ethlite_register_types)