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