1 #include "qemu/osdep.h" 2 #include "hw/irq.h" 3 #include "hw/qdev-properties.h" 4 #include "net/net.h" 5 #include "qemu/module.h" 6 #include "trace.h" 7 #include "hw/sysbus.h" 8 #include "migration/vmstate.h" 9 10 /* MIPSnet register offsets */ 11 12 #define MIPSNET_DEV_ID 0x00 13 #define MIPSNET_BUSY 0x08 14 #define MIPSNET_RX_DATA_COUNT 0x0c 15 #define MIPSNET_TX_DATA_COUNT 0x10 16 #define MIPSNET_INT_CTL 0x14 17 # define MIPSNET_INTCTL_TXDONE 0x00000001 18 # define MIPSNET_INTCTL_RXDONE 0x00000002 19 # define MIPSNET_INTCTL_TESTBIT 0x80000000 20 #define MIPSNET_INTERRUPT_INFO 0x18 21 #define MIPSNET_RX_DATA_BUFFER 0x1c 22 #define MIPSNET_TX_DATA_BUFFER 0x20 23 24 #define MAX_ETH_FRAME_SIZE 1514 25 26 #define TYPE_MIPS_NET "mipsnet" 27 #define MIPS_NET(obj) OBJECT_CHECK(MIPSnetState, (obj), TYPE_MIPS_NET) 28 29 typedef struct MIPSnetState { 30 SysBusDevice parent_obj; 31 32 uint32_t busy; 33 uint32_t rx_count; 34 uint32_t rx_read; 35 uint32_t tx_count; 36 uint32_t tx_written; 37 uint32_t intctl; 38 uint8_t rx_buffer[MAX_ETH_FRAME_SIZE]; 39 uint8_t tx_buffer[MAX_ETH_FRAME_SIZE]; 40 MemoryRegion io; 41 qemu_irq irq; 42 NICState *nic; 43 NICConf conf; 44 } MIPSnetState; 45 46 static void mipsnet_reset(MIPSnetState *s) 47 { 48 s->busy = 1; 49 s->rx_count = 0; 50 s->rx_read = 0; 51 s->tx_count = 0; 52 s->tx_written = 0; 53 s->intctl = 0; 54 memset(s->rx_buffer, 0, MAX_ETH_FRAME_SIZE); 55 memset(s->tx_buffer, 0, MAX_ETH_FRAME_SIZE); 56 } 57 58 static void mipsnet_update_irq(MIPSnetState *s) 59 { 60 int isr = !!s->intctl; 61 trace_mipsnet_irq(isr, s->intctl); 62 qemu_set_irq(s->irq, isr); 63 } 64 65 static int mipsnet_buffer_full(MIPSnetState *s) 66 { 67 if (s->rx_count >= MAX_ETH_FRAME_SIZE) { 68 return 1; 69 } 70 return 0; 71 } 72 73 static int mipsnet_can_receive(NetClientState *nc) 74 { 75 MIPSnetState *s = qemu_get_nic_opaque(nc); 76 77 if (s->busy) { 78 return 0; 79 } 80 return !mipsnet_buffer_full(s); 81 } 82 83 static ssize_t mipsnet_receive(NetClientState *nc, 84 const uint8_t *buf, size_t size) 85 { 86 MIPSnetState *s = qemu_get_nic_opaque(nc); 87 88 trace_mipsnet_receive(size); 89 if (!mipsnet_can_receive(nc)) { 90 return 0; 91 } 92 93 if (size >= sizeof(s->rx_buffer)) { 94 return 0; 95 } 96 s->busy = 1; 97 98 /* Just accept everything. */ 99 100 /* Write packet data. */ 101 memcpy(s->rx_buffer, buf, size); 102 103 s->rx_count = size; 104 s->rx_read = 0; 105 106 /* Now we can signal we have received something. */ 107 s->intctl |= MIPSNET_INTCTL_RXDONE; 108 mipsnet_update_irq(s); 109 110 return size; 111 } 112 113 static uint64_t mipsnet_ioport_read(void *opaque, hwaddr addr, 114 unsigned int size) 115 { 116 MIPSnetState *s = opaque; 117 int ret = 0; 118 119 addr &= 0x3f; 120 switch (addr) { 121 case MIPSNET_DEV_ID: 122 ret = be32_to_cpu(0x4d495053); /* MIPS */ 123 break; 124 case MIPSNET_DEV_ID + 4: 125 ret = be32_to_cpu(0x4e455430); /* NET0 */ 126 break; 127 case MIPSNET_BUSY: 128 ret = s->busy; 129 break; 130 case MIPSNET_RX_DATA_COUNT: 131 ret = s->rx_count; 132 break; 133 case MIPSNET_TX_DATA_COUNT: 134 ret = s->tx_count; 135 break; 136 case MIPSNET_INT_CTL: 137 ret = s->intctl; 138 s->intctl &= ~MIPSNET_INTCTL_TESTBIT; 139 break; 140 case MIPSNET_INTERRUPT_INFO: 141 /* XXX: This seems to be a per-VPE interrupt number. */ 142 ret = 0; 143 break; 144 case MIPSNET_RX_DATA_BUFFER: 145 if (s->rx_count) { 146 s->rx_count--; 147 ret = s->rx_buffer[s->rx_read++]; 148 if (mipsnet_can_receive(s->nic->ncs)) { 149 qemu_flush_queued_packets(qemu_get_queue(s->nic)); 150 } 151 } 152 break; 153 /* Reads as zero. */ 154 case MIPSNET_TX_DATA_BUFFER: 155 default: 156 break; 157 } 158 trace_mipsnet_read(addr, ret); 159 return ret; 160 } 161 162 static void mipsnet_ioport_write(void *opaque, hwaddr addr, 163 uint64_t val, unsigned int size) 164 { 165 MIPSnetState *s = opaque; 166 167 addr &= 0x3f; 168 trace_mipsnet_write(addr, val); 169 switch (addr) { 170 case MIPSNET_TX_DATA_COUNT: 171 s->tx_count = (val <= MAX_ETH_FRAME_SIZE) ? val : 0; 172 s->tx_written = 0; 173 break; 174 case MIPSNET_INT_CTL: 175 if (val & MIPSNET_INTCTL_TXDONE) { 176 s->intctl &= ~MIPSNET_INTCTL_TXDONE; 177 } else if (val & MIPSNET_INTCTL_RXDONE) { 178 s->intctl &= ~MIPSNET_INTCTL_RXDONE; 179 } else if (val & MIPSNET_INTCTL_TESTBIT) { 180 mipsnet_reset(s); 181 s->intctl |= MIPSNET_INTCTL_TESTBIT; 182 } else if (!val) { 183 /* ACK testbit interrupt, flag was cleared on read. */ 184 } 185 s->busy = !!s->intctl; 186 mipsnet_update_irq(s); 187 if (mipsnet_can_receive(s->nic->ncs)) { 188 qemu_flush_queued_packets(qemu_get_queue(s->nic)); 189 } 190 break; 191 case MIPSNET_TX_DATA_BUFFER: 192 s->tx_buffer[s->tx_written++] = val; 193 if ((s->tx_written >= MAX_ETH_FRAME_SIZE) 194 || (s->tx_written == s->tx_count)) { 195 /* Send buffer. */ 196 trace_mipsnet_send(s->tx_written); 197 qemu_send_packet(qemu_get_queue(s->nic), 198 s->tx_buffer, s->tx_written); 199 s->tx_count = s->tx_written = 0; 200 s->intctl |= MIPSNET_INTCTL_TXDONE; 201 s->busy = 1; 202 mipsnet_update_irq(s); 203 } 204 break; 205 /* Read-only registers */ 206 case MIPSNET_DEV_ID: 207 case MIPSNET_BUSY: 208 case MIPSNET_RX_DATA_COUNT: 209 case MIPSNET_INTERRUPT_INFO: 210 case MIPSNET_RX_DATA_BUFFER: 211 default: 212 break; 213 } 214 } 215 216 static const VMStateDescription vmstate_mipsnet = { 217 .name = "mipsnet", 218 .version_id = 0, 219 .minimum_version_id = 0, 220 .fields = (VMStateField[]) { 221 VMSTATE_UINT32(busy, MIPSnetState), 222 VMSTATE_UINT32(rx_count, MIPSnetState), 223 VMSTATE_UINT32(rx_read, MIPSnetState), 224 VMSTATE_UINT32(tx_count, MIPSnetState), 225 VMSTATE_UINT32(tx_written, MIPSnetState), 226 VMSTATE_UINT32(intctl, MIPSnetState), 227 VMSTATE_BUFFER(rx_buffer, MIPSnetState), 228 VMSTATE_BUFFER(tx_buffer, MIPSnetState), 229 VMSTATE_END_OF_LIST() 230 } 231 }; 232 233 static NetClientInfo net_mipsnet_info = { 234 .type = NET_CLIENT_DRIVER_NIC, 235 .size = sizeof(NICState), 236 .receive = mipsnet_receive, 237 }; 238 239 static const MemoryRegionOps mipsnet_ioport_ops = { 240 .read = mipsnet_ioport_read, 241 .write = mipsnet_ioport_write, 242 .impl.min_access_size = 1, 243 .impl.max_access_size = 4, 244 }; 245 246 static void mipsnet_realize(DeviceState *dev, Error **errp) 247 { 248 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 249 MIPSnetState *s = MIPS_NET(dev); 250 251 memory_region_init_io(&s->io, OBJECT(dev), &mipsnet_ioport_ops, s, 252 "mipsnet-io", 36); 253 sysbus_init_mmio(sbd, &s->io); 254 sysbus_init_irq(sbd, &s->irq); 255 256 s->nic = qemu_new_nic(&net_mipsnet_info, &s->conf, 257 object_get_typename(OBJECT(dev)), dev->id, s); 258 qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a); 259 } 260 261 static void mipsnet_sysbus_reset(DeviceState *dev) 262 { 263 MIPSnetState *s = MIPS_NET(dev); 264 mipsnet_reset(s); 265 } 266 267 static Property mipsnet_properties[] = { 268 DEFINE_NIC_PROPERTIES(MIPSnetState, conf), 269 DEFINE_PROP_END_OF_LIST(), 270 }; 271 272 static void mipsnet_class_init(ObjectClass *klass, void *data) 273 { 274 DeviceClass *dc = DEVICE_CLASS(klass); 275 276 dc->realize = mipsnet_realize; 277 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 278 dc->desc = "MIPS Simulator network device"; 279 dc->reset = mipsnet_sysbus_reset; 280 dc->vmsd = &vmstate_mipsnet; 281 dc->props = mipsnet_properties; 282 } 283 284 static const TypeInfo mipsnet_info = { 285 .name = TYPE_MIPS_NET, 286 .parent = TYPE_SYS_BUS_DEVICE, 287 .instance_size = sizeof(MIPSnetState), 288 .class_init = mipsnet_class_init, 289 }; 290 291 static void mipsnet_register_types(void) 292 { 293 type_register_static(&mipsnet_info); 294 } 295 296 type_init(mipsnet_register_types) 297