hw/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 "sysbus.h"
  26 #include "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 struct xlx_ethlite
  51 {
  52     SysBusDevice busdev;
  53     MemoryRegion mmio;
  54     qemu_irq irq;
  55     NICState *nic;
  56     NICConf conf;
  57
  58     uint32_t c_tx_pingpong;
  59     uint32_t c_rx_pingpong;
  60     unsigned int txbuf;
  61     unsigned int rxbuf;
  62
  63     uint32_t regs[R_MAX];
  64 };
  65
  66 static inline void eth_pulse_irq(struct xlx_ethlite *s)
  67 {
  68     /* Only the first gie reg is active.  */
  69     if (s->regs[R_TX_GIE0] & GIE_GIE) {
  70         qemu_irq_pulse(s->irq);
  71     }
  72 }
  73
  74 static uint64_t
  75 eth_read(void *opaque, hwaddr addr, unsigned int size)
  76 {
  77     struct xlx_ethlite *s = opaque;
  78     uint32_t r = 0;
  79
  80     addr >>= 2;
  81
  82     switch (addr)
  83     {
  84         case R_TX_GIE0:
  85         case R_TX_LEN0:
  86         case R_TX_LEN1:
  87         case R_TX_CTRL1:
  88         case R_TX_CTRL0:
  89         case R_RX_CTRL1:
  90         case R_RX_CTRL0:
  91             r = s->regs[addr];
  92             D(qemu_log("%s %x=%x\n", __func__, addr * 4, r));
  93             break;
  94
  95         default:
  96             r = tswap32(s->regs[addr]);
  97             break;
  98     }
  99     return r;
 100 }
 101
 102 static void
 103 eth_write(void *opaque, hwaddr addr,
 104           uint64_t val64, unsigned int size)
 105 {
 106     struct xlx_ethlite *s = opaque;
 107     unsigned int base = 0;
 108     uint32_t value = val64;
 109
 110     addr >>= 2;
 111     switch (addr)
 112     {
 113         case R_TX_CTRL0:
 114         case R_TX_CTRL1:
 115             if (addr == R_TX_CTRL1)
 116                 base = 0x800 / 4;
 117
 118             D(qemu_log("%s addr=%x val=%x\n", __func__, addr * 4, value));
 119             if ((value & (CTRL_P | CTRL_S)) == CTRL_S) {
 120                 qemu_send_packet(&s->nic->nc,
 121                                  (void *) &s->regs[base],
 122                                  s->regs[base + R_TX_LEN0]);
 123                 D(qemu_log("eth_tx %d\n", s->regs[base + R_TX_LEN0]));
 124                 if (s->regs[base + R_TX_CTRL0] & CTRL_I)
 125                     eth_pulse_irq(s);
 126             } else if ((value & (CTRL_P | CTRL_S)) == (CTRL_P | CTRL_S)) {
 127                 memcpy(&s->conf.macaddr.a[0], &s->regs[base], 6);
 128                 if (s->regs[base + R_TX_CTRL0] & CTRL_I)
 129                     eth_pulse_irq(s);
 130             }
 131
 132             /* We are fast and get ready pretty much immediately so
 133                we actually never flip the S nor P bits to one.  */
 134             s->regs[addr] = value & ~(CTRL_P | CTRL_S);
 135             break;
 136
 137         /* Keep these native.  */
 138         case R_TX_LEN0:
 139         case R_TX_LEN1:
 140         case R_TX_GIE0:
 141         case R_RX_CTRL0:
 142         case R_RX_CTRL1:
 143             D(qemu_log("%s addr=%x val=%x\n", __func__, addr * 4, value));
 144             s->regs[addr] = value;
 145             break;
 146
 147         default:
 148             s->regs[addr] = tswap32(value);
 149             break;
 150     }
 151 }
 152
 153 static const MemoryRegionOps eth_ops = {
 154     .read = eth_read,
 155     .write = eth_write,
 156     .endianness = DEVICE_NATIVE_ENDIAN,
 157     .valid = {
 158         .min_access_size = 4,
 159         .max_access_size = 4
 160     }
 161 };
 162
 163 static int eth_can_rx(NetClientState *nc)
 164 {
 165     struct xlx_ethlite *s = DO_UPCAST(NICState, nc, nc)->opaque;
 166     int r;
 167     r = !(s->regs[R_RX_CTRL0] & CTRL_S);
 168     return r;
 169 }
 170
 171 static ssize_t eth_rx(NetClientState *nc, const uint8_t *buf, size_t size)
 172 {
 173     struct xlx_ethlite *s = DO_UPCAST(NICState, nc, nc)->opaque;
 174     unsigned int rxbase = s->rxbuf * (0x800 / 4);
 175
 176     /* DA filter.  */
 177     if (!(buf[0] & 0x80) && memcmp(&s->conf.macaddr.a[0], buf, 6))
 178         return size;
 179
 180     if (s->regs[rxbase + R_RX_CTRL0] & CTRL_S) {
 181         D(qemu_log("ethlite lost packet %x\n", s->regs[R_RX_CTRL0]));
 182         return -1;
 183     }
 184
 185     D(qemu_log("%s %d rxbase=%x\n", __func__, size, rxbase));
 186     memcpy(&s->regs[rxbase + R_RX_BUF0], buf, size);
 187
 188     s->regs[rxbase + R_RX_CTRL0] |= CTRL_S;
 189     if (s->regs[rxbase + R_RX_CTRL0] & CTRL_I)
 190         eth_pulse_irq(s);
 191
 192     /* If c_rx_pingpong was set flip buffers.  */
 193     s->rxbuf ^= s->c_rx_pingpong;
 194     return size;
 195 }
 196
 197 static void eth_cleanup(NetClientState *nc)
 198 {
 199     struct xlx_ethlite *s = DO_UPCAST(NICState, nc, nc)->opaque;
 200
 201     s->nic = NULL;
 202 }
 203
 204 static NetClientInfo net_xilinx_ethlite_info = {
 205     .type = NET_CLIENT_OPTIONS_KIND_NIC,
 206     .size = sizeof(NICState),
 207     .can_receive = eth_can_rx,
 208     .receive = eth_rx,
 209     .cleanup = eth_cleanup,
 210 };
 211
 212 static int xilinx_ethlite_init(SysBusDevice *dev)
 213 {
 214     struct xlx_ethlite *s = FROM_SYSBUS(typeof (*s), dev);
 215
 216     sysbus_init_irq(dev, &s->irq);
 217     s->rxbuf = 0;
 218
 219     memory_region_init_io(&s->mmio, &eth_ops, s, "xlnx.xps-ethernetlite",
 220                                                                     R_MAX * 4);
 221     sysbus_init_mmio(dev, &s->mmio);
 222
 223     qemu_macaddr_default_if_unset(&s->conf.macaddr);
 224     s->nic = qemu_new_nic(&net_xilinx_ethlite_info, &s->conf,
 225                           object_get_typename(OBJECT(dev)), dev->qdev.id, s);
 226     qemu_format_nic_info_str(&s->nic->nc, s->conf.macaddr.a);
 227     return 0;
 228 }
 229
 230 static Property xilinx_ethlite_properties[] = {
 231     DEFINE_PROP_UINT32("tx-ping-pong", struct xlx_ethlite, c_tx_pingpong, 1),
 232     DEFINE_PROP_UINT32("rx-ping-pong", struct xlx_ethlite, c_rx_pingpong, 1),
 233     DEFINE_NIC_PROPERTIES(struct xlx_ethlite, conf),
 234     DEFINE_PROP_END_OF_LIST(),
 235 };
 236
 237 static void xilinx_ethlite_class_init(ObjectClass *klass, void *data)
 238 {
 239     DeviceClass *dc = DEVICE_CLASS(klass);
 240     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 241
 242     k->init = xilinx_ethlite_init;
 243     dc->props = xilinx_ethlite_properties;
 244 }
 245
 246 static const TypeInfo xilinx_ethlite_info = {
 247     .name          = "xlnx.xps-ethernetlite",
 248     .parent        = TYPE_SYS_BUS_DEVICE,
 249     .instance_size = sizeof(struct xlx_ethlite),
 250     .class_init    = xilinx_ethlite_class_init,
 251 };
 252
 253 static void xilinx_ethlite_register_types(void)
 254 {
 255     type_register_static(&xilinx_ethlite_info);
 256 }
 257
 258 type_init(xilinx_ethlite_register_types)