1#include "hw.h"
2#include "net/net.h"
3#include "trace.h"
4#include "sysbus.h"
5
6
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
22typedef struct MIPSnetState {
23 SysBusDevice busdev;
24
25 uint32_t busy;
26 uint32_t rx_count;
27 uint32_t rx_read;
28 uint32_t tx_count;
29 uint32_t tx_written;
30 uint32_t intctl;
31 uint8_t rx_buffer[MAX_ETH_FRAME_SIZE];
32 uint8_t tx_buffer[MAX_ETH_FRAME_SIZE];
33 MemoryRegion io;
34 qemu_irq irq;
35 NICState *nic;
36 NICConf conf;
37} MIPSnetState;
38
39static void mipsnet_reset(MIPSnetState *s)
40{
41 s->busy = 1;
42 s->rx_count = 0;
43 s->rx_read = 0;
44 s->tx_count = 0;
45 s->tx_written = 0;
46 s->intctl = 0;
47 memset(s->rx_buffer, 0, MAX_ETH_FRAME_SIZE);
48 memset(s->tx_buffer, 0, MAX_ETH_FRAME_SIZE);
49}
50
51static void mipsnet_update_irq(MIPSnetState *s)
52{
53 int isr = !!s->intctl;
54 trace_mipsnet_irq(isr, s->intctl);
55 qemu_set_irq(s->irq, isr);
56}
57
58static int mipsnet_buffer_full(MIPSnetState *s)
59{
60 if (s->rx_count >= MAX_ETH_FRAME_SIZE)
61 return 1;
62 return 0;
63}
64
65static int mipsnet_can_receive(NetClientState *nc)
66{
67 MIPSnetState *s = qemu_get_nic_opaque(nc);
68
69 if (s->busy)
70 return 0;
71 return !mipsnet_buffer_full(s);
72}
73
74static ssize_t mipsnet_receive(NetClientState *nc, const uint8_t *buf, size_t size)
75{
76 MIPSnetState *s = qemu_get_nic_opaque(nc);
77
78 trace_mipsnet_receive(size);
79 if (!mipsnet_can_receive(nc))
80 return -1;
81
82 s->busy = 1;
83
84
85
86
87 memcpy(s->rx_buffer, buf, size);
88
89 s->rx_count = size;
90 s->rx_read = 0;
91
92
93 s->intctl |= MIPSNET_INTCTL_RXDONE;
94 mipsnet_update_irq(s);
95
96 return size;
97}
98
99static uint64_t mipsnet_ioport_read(void *opaque, hwaddr addr,
100 unsigned int size)
101{
102 MIPSnetState *s = opaque;
103 int ret = 0;
104
105 addr &= 0x3f;
106 switch (addr) {
107 case MIPSNET_DEV_ID:
108 ret = be32_to_cpu(0x4d495053);
109 break;
110 case MIPSNET_DEV_ID + 4:
111 ret = be32_to_cpu(0x4e455430);
112 break;
113 case MIPSNET_BUSY:
114 ret = s->busy;
115 break;
116 case MIPSNET_RX_DATA_COUNT:
117 ret = s->rx_count;
118 break;
119 case MIPSNET_TX_DATA_COUNT:
120 ret = s->tx_count;
121 break;
122 case MIPSNET_INT_CTL:
123 ret = s->intctl;
124 s->intctl &= ~MIPSNET_INTCTL_TESTBIT;
125 break;
126 case MIPSNET_INTERRUPT_INFO:
127
128 ret = 0;
129 break;
130 case MIPSNET_RX_DATA_BUFFER:
131 if (s->rx_count) {
132 s->rx_count--;
133 ret = s->rx_buffer[s->rx_read++];
134 }
135 break;
136
137 case MIPSNET_TX_DATA_BUFFER:
138 default:
139 break;
140 }
141 trace_mipsnet_read(addr, ret);
142 return ret;
143}
144
145static void mipsnet_ioport_write(void *opaque, hwaddr addr,
146 uint64_t val, unsigned int size)
147{
148 MIPSnetState *s = opaque;
149
150 addr &= 0x3f;
151 trace_mipsnet_write(addr, val);
152 switch (addr) {
153 case MIPSNET_TX_DATA_COUNT:
154 s->tx_count = (val <= MAX_ETH_FRAME_SIZE) ? val : 0;
155 s->tx_written = 0;
156 break;
157 case MIPSNET_INT_CTL:
158 if (val & MIPSNET_INTCTL_TXDONE) {
159 s->intctl &= ~MIPSNET_INTCTL_TXDONE;
160 } else if (val & MIPSNET_INTCTL_RXDONE) {
161 s->intctl &= ~MIPSNET_INTCTL_RXDONE;
162 } else if (val & MIPSNET_INTCTL_TESTBIT) {
163 mipsnet_reset(s);
164 s->intctl |= MIPSNET_INTCTL_TESTBIT;
165 } else if (!val) {
166
167 }
168 s->busy = !!s->intctl;
169 mipsnet_update_irq(s);
170 break;
171 case MIPSNET_TX_DATA_BUFFER:
172 s->tx_buffer[s->tx_written++] = val;
173 if (s->tx_written == s->tx_count) {
174
175 trace_mipsnet_send(s->tx_count);
176 qemu_send_packet(qemu_get_queue(s->nic), s->tx_buffer, s->tx_count);
177 s->tx_count = s->tx_written = 0;
178 s->intctl |= MIPSNET_INTCTL_TXDONE;
179 s->busy = 1;
180 mipsnet_update_irq(s);
181 }
182 break;
183
184 case MIPSNET_DEV_ID:
185 case MIPSNET_BUSY:
186 case MIPSNET_RX_DATA_COUNT:
187 case MIPSNET_INTERRUPT_INFO:
188 case MIPSNET_RX_DATA_BUFFER:
189 default:
190 break;
191 }
192}
193
194static const VMStateDescription vmstate_mipsnet = {
195 .name = "mipsnet",
196 .version_id = 0,
197 .minimum_version_id = 0,
198 .minimum_version_id_old = 0,
199 .fields = (VMStateField[]) {
200 VMSTATE_UINT32(busy, MIPSnetState),
201 VMSTATE_UINT32(rx_count, MIPSnetState),
202 VMSTATE_UINT32(rx_read, MIPSnetState),
203 VMSTATE_UINT32(tx_count, MIPSnetState),
204 VMSTATE_UINT32(tx_written, MIPSnetState),
205 VMSTATE_UINT32(intctl, MIPSnetState),
206 VMSTATE_BUFFER(rx_buffer, MIPSnetState),
207 VMSTATE_BUFFER(tx_buffer, MIPSnetState),
208 VMSTATE_END_OF_LIST()
209 }
210};
211
212static void mipsnet_cleanup(NetClientState *nc)
213{
214 MIPSnetState *s = qemu_get_nic_opaque(nc);
215
216 s->nic = NULL;
217}
218
219static NetClientInfo net_mipsnet_info = {
220 .type = NET_CLIENT_OPTIONS_KIND_NIC,
221 .size = sizeof(NICState),
222 .can_receive = mipsnet_can_receive,
223 .receive = mipsnet_receive,
224 .cleanup = mipsnet_cleanup,
225};
226
227static const MemoryRegionOps mipsnet_ioport_ops = {
228 .read = mipsnet_ioport_read,
229 .write = mipsnet_ioport_write,
230 .impl.min_access_size = 1,
231 .impl.max_access_size = 4,
232};
233
234static int mipsnet_sysbus_init(SysBusDevice *dev)
235{
236 MIPSnetState *s = DO_UPCAST(MIPSnetState, busdev, dev);
237
238 memory_region_init_io(&s->io, &mipsnet_ioport_ops, s, "mipsnet-io", 36);
239 sysbus_init_mmio(dev, &s->io);
240 sysbus_init_irq(dev, &s->irq);
241
242 s->nic = qemu_new_nic(&net_mipsnet_info, &s->conf,
243 object_get_typename(OBJECT(dev)), dev->qdev.id, s);
244 qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
245
246 return 0;
247}
248
249static void mipsnet_sysbus_reset(DeviceState *dev)
250{
251 MIPSnetState *s = DO_UPCAST(MIPSnetState, busdev.qdev, dev);
252 mipsnet_reset(s);
253}
254
255static Property mipsnet_properties[] = {
256 DEFINE_NIC_PROPERTIES(MIPSnetState, conf),
257 DEFINE_PROP_END_OF_LIST(),
258};
259
260static void mipsnet_class_init(ObjectClass *klass, void *data)
261{
262 DeviceClass *dc = DEVICE_CLASS(klass);
263 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
264
265 k->init = mipsnet_sysbus_init;
266 dc->desc = "MIPS Simulator network device";
267 dc->reset = mipsnet_sysbus_reset;
268 dc->vmsd = &vmstate_mipsnet;
269 dc->props = mipsnet_properties;
270}
271
272static const TypeInfo mipsnet_info = {
273 .name = "mipsnet",
274 .parent = TYPE_SYS_BUS_DEVICE,
275 .instance_size = sizeof(MIPSnetState),
276 .class_init = mipsnet_class_init,
277};
278
279static void mipsnet_register_types(void)
280{
281 type_register_static(&mipsnet_info);
282}
283
284type_init(mipsnet_register_types)
285
