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9#include "hw/sysbus.h"
10#include "net/net.h"
11#include <zlib.h>
12
13
14
15#ifdef DEBUG_STELLARIS_ENET
16#define DPRINTF(fmt, ...) \
17do { printf("stellaris_enet: " fmt , ## __VA_ARGS__); } while (0)
18#define BADF(fmt, ...) \
19do { fprintf(stderr, "stellaris_enet: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)
20#else
21#define DPRINTF(fmt, ...) do {} while(0)
22#define BADF(fmt, ...) \
23do { fprintf(stderr, "stellaris_enet: error: " fmt , ## __VA_ARGS__);} while (0)
24#endif
25
26#define SE_INT_RX 0x01
27#define SE_INT_TXER 0x02
28#define SE_INT_TXEMP 0x04
29#define SE_INT_FOV 0x08
30#define SE_INT_RXER 0x10
31#define SE_INT_MD 0x20
32#define SE_INT_PHY 0x40
33
34#define SE_RCTL_RXEN 0x01
35#define SE_RCTL_AMUL 0x02
36#define SE_RCTL_PRMS 0x04
37#define SE_RCTL_BADCRC 0x08
38#define SE_RCTL_RSTFIFO 0x10
39
40#define SE_TCTL_TXEN 0x01
41#define SE_TCTL_PADEN 0x02
42#define SE_TCTL_CRC 0x04
43#define SE_TCTL_DUPLEX 0x08
44
45#define TYPE_STELLARIS_ENET "stellaris_enet"
46#define STELLARIS_ENET(obj) \
47 OBJECT_CHECK(stellaris_enet_state, (obj), TYPE_STELLARIS_ENET)
48
49typedef struct {
50 SysBusDevice parent_obj;
51
52 uint32_t ris;
53 uint32_t im;
54 uint32_t rctl;
55 uint32_t tctl;
56 uint32_t thr;
57 uint32_t mctl;
58 uint32_t mdv;
59 uint32_t mtxd;
60 uint32_t mrxd;
61 uint32_t np;
62 int tx_frame_len;
63 int tx_fifo_len;
64 uint8_t tx_fifo[2048];
65
66
67 struct {
68 uint8_t data[2048];
69 int len;
70 } rx[31];
71 uint8_t *rx_fifo;
72 int rx_fifo_len;
73 int next_packet;
74 NICState *nic;
75 NICConf conf;
76 qemu_irq irq;
77 MemoryRegion mmio;
78} stellaris_enet_state;
79
80static void stellaris_enet_update(stellaris_enet_state *s)
81{
82 qemu_set_irq(s->irq, (s->ris & s->im) != 0);
83}
84
85
86static ssize_t stellaris_enet_receive(NetClientState *nc, const uint8_t *buf, size_t size)
87{
88 stellaris_enet_state *s = qemu_get_nic_opaque(nc);
89 int n;
90 uint8_t *p;
91 uint32_t crc;
92
93 if ((s->rctl & SE_RCTL_RXEN) == 0)
94 return -1;
95 if (s->np >= 31) {
96 DPRINTF("Packet dropped\n");
97 return -1;
98 }
99
100 DPRINTF("Received packet len=%d\n", size);
101 n = s->next_packet + s->np;
102 if (n >= 31)
103 n -= 31;
104 s->np++;
105
106 s->rx[n].len = size + 6;
107 p = s->rx[n].data;
108 *(p++) = (size + 6);
109 *(p++) = (size + 6) >> 8;
110 memcpy (p, buf, size);
111 p += size;
112 crc = crc32(~0, buf, size);
113 *(p++) = crc;
114 *(p++) = crc >> 8;
115 *(p++) = crc >> 16;
116 *(p++) = crc >> 24;
117
118 if ((size & 3) != 2) {
119 memset(p, 0, (6 - size) & 3);
120 }
121
122 s->ris |= SE_INT_RX;
123 stellaris_enet_update(s);
124
125 return size;
126}
127
128static int stellaris_enet_can_receive(NetClientState *nc)
129{
130 stellaris_enet_state *s = qemu_get_nic_opaque(nc);
131
132 if ((s->rctl & SE_RCTL_RXEN) == 0)
133 return 1;
134
135 return (s->np < 31);
136}
137
138static uint64_t stellaris_enet_read(void *opaque, hwaddr offset,
139 unsigned size)
140{
141 stellaris_enet_state *s = (stellaris_enet_state *)opaque;
142 uint32_t val;
143
144 switch (offset) {
145 case 0x00:
146 DPRINTF("IRQ status %02x\n", s->ris);
147 return s->ris;
148 case 0x04:
149 return s->im;
150 case 0x08:
151 return s->rctl;
152 case 0x0c:
153 return s->tctl;
154 case 0x10:
155 if (s->rx_fifo_len == 0) {
156 if (s->np == 0) {
157 BADF("RX underflow\n");
158 return 0;
159 }
160 s->rx_fifo_len = s->rx[s->next_packet].len;
161 s->rx_fifo = s->rx[s->next_packet].data;
162 DPRINTF("RX FIFO start packet len=%d\n", s->rx_fifo_len);
163 }
164 val = s->rx_fifo[0] | (s->rx_fifo[1] << 8) | (s->rx_fifo[2] << 16)
165 | (s->rx_fifo[3] << 24);
166 s->rx_fifo += 4;
167 s->rx_fifo_len -= 4;
168 if (s->rx_fifo_len <= 0) {
169 s->rx_fifo_len = 0;
170 s->next_packet++;
171 if (s->next_packet >= 31)
172 s->next_packet = 0;
173 s->np--;
174 DPRINTF("RX done np=%d\n", s->np);
175 }
176 return val;
177 case 0x14:
178 return s->conf.macaddr.a[0] | (s->conf.macaddr.a[1] << 8)
179 | (s->conf.macaddr.a[2] << 16) | (s->conf.macaddr.a[3] << 24);
180 case 0x18:
181 return s->conf.macaddr.a[4] | (s->conf.macaddr.a[5] << 8);
182 case 0x1c:
183 return s->thr;
184 case 0x20:
185 return s->mctl;
186 case 0x24:
187 return s->mdv;
188 case 0x28:
189 return 0;
190 case 0x2c:
191 return s->mtxd;
192 case 0x30:
193 return s->mrxd;
194 case 0x34:
195 return s->np;
196 case 0x38:
197 return 0;
198 case 0x3c:
199 return 0;
200 default:
201 hw_error("stellaris_enet_read: Bad offset %x\n", (int)offset);
202 return 0;
203 }
204}
205
206static void stellaris_enet_write(void *opaque, hwaddr offset,
207 uint64_t value, unsigned size)
208{
209 stellaris_enet_state *s = (stellaris_enet_state *)opaque;
210
211 switch (offset) {
212 case 0x00:
213 s->ris &= ~value;
214 DPRINTF("IRQ ack %02x/%02x\n", value, s->ris);
215 stellaris_enet_update(s);
216
217 if (value & SE_INT_TXER)
218 s->tx_frame_len = -1;
219 break;
220 case 0x04:
221 DPRINTF("IRQ mask %02x/%02x\n", value, s->ris);
222 s->im = value;
223 stellaris_enet_update(s);
224 break;
225 case 0x08:
226 s->rctl = value;
227 if (value & SE_RCTL_RSTFIFO) {
228 s->rx_fifo_len = 0;
229 s->np = 0;
230 stellaris_enet_update(s);
231 }
232 break;
233 case 0x0c:
234 s->tctl = value;
235 break;
236 case 0x10:
237 if (s->tx_frame_len == -1) {
238 s->tx_frame_len = value & 0xffff;
239 if (s->tx_frame_len > 2032) {
240 DPRINTF("TX frame too long (%d)\n", s->tx_frame_len);
241 s->tx_frame_len = 0;
242 s->ris |= SE_INT_TXER;
243 stellaris_enet_update(s);
244 } else {
245 DPRINTF("Start TX frame len=%d\n", s->tx_frame_len);
246
247 s->tx_frame_len += 14;
248 if ((s->tctl & SE_TCTL_CRC) == 0)
249 s->tx_frame_len += 4;
250 s->tx_fifo_len = 0;
251 s->tx_fifo[s->tx_fifo_len++] = value >> 16;
252 s->tx_fifo[s->tx_fifo_len++] = value >> 24;
253 }
254 } else {
255 s->tx_fifo[s->tx_fifo_len++] = value;
256 s->tx_fifo[s->tx_fifo_len++] = value >> 8;
257 s->tx_fifo[s->tx_fifo_len++] = value >> 16;
258 s->tx_fifo[s->tx_fifo_len++] = value >> 24;
259 if (s->tx_fifo_len >= s->tx_frame_len) {
260
261 if ((s->tctl & SE_TCTL_CRC) == 0)
262 s->tx_frame_len -= 4;
263 if ((s->tctl & SE_TCTL_PADEN) && s->tx_frame_len < 60) {
264 memset(&s->tx_fifo[s->tx_frame_len], 0, 60 - s->tx_frame_len);
265 s->tx_fifo_len = 60;
266 }
267 qemu_send_packet(qemu_get_queue(s->nic), s->tx_fifo,
268 s->tx_frame_len);
269 s->tx_frame_len = -1;
270 s->ris |= SE_INT_TXEMP;
271 stellaris_enet_update(s);
272 DPRINTF("Done TX\n");
273 }
274 }
275 break;
276 case 0x14:
277 s->conf.macaddr.a[0] = value;
278 s->conf.macaddr.a[1] = value >> 8;
279 s->conf.macaddr.a[2] = value >> 16;
280 s->conf.macaddr.a[3] = value >> 24;
281 break;
282 case 0x18:
283 s->conf.macaddr.a[4] = value;
284 s->conf.macaddr.a[5] = value >> 8;
285 break;
286 case 0x1c:
287 s->thr = value;
288 break;
289 case 0x20:
290 s->mctl = value;
291 break;
292 case 0x24:
293 s->mdv = value;
294 break;
295 case 0x28:
296
297 break;
298 case 0x2c:
299 s->mtxd = value & 0xff;
300 break;
301 case 0x30:
302 case 0x34:
303 case 0x38:
304
305 case 0x3c:
306
307 break;
308 default:
309 hw_error("stellaris_enet_write: Bad offset %x\n", (int)offset);
310 }
311}
312
313static const MemoryRegionOps stellaris_enet_ops = {
314 .read = stellaris_enet_read,
315 .write = stellaris_enet_write,
316 .endianness = DEVICE_NATIVE_ENDIAN,
317};
318
319static void stellaris_enet_reset(stellaris_enet_state *s)
320{
321 s->mdv = 0x80;
322 s->rctl = SE_RCTL_BADCRC;
323 s->im = SE_INT_PHY | SE_INT_MD | SE_INT_RXER | SE_INT_FOV | SE_INT_TXEMP
324 | SE_INT_TXER | SE_INT_RX;
325 s->thr = 0x3f;
326 s->tx_frame_len = -1;
327}
328
329static void stellaris_enet_save(QEMUFile *f, void *opaque)
330{
331 stellaris_enet_state *s = (stellaris_enet_state *)opaque;
332 int i;
333
334 qemu_put_be32(f, s->ris);
335 qemu_put_be32(f, s->im);
336 qemu_put_be32(f, s->rctl);
337 qemu_put_be32(f, s->tctl);
338 qemu_put_be32(f, s->thr);
339 qemu_put_be32(f, s->mctl);
340 qemu_put_be32(f, s->mdv);
341 qemu_put_be32(f, s->mtxd);
342 qemu_put_be32(f, s->mrxd);
343 qemu_put_be32(f, s->np);
344 qemu_put_be32(f, s->tx_frame_len);
345 qemu_put_be32(f, s->tx_fifo_len);
346 qemu_put_buffer(f, s->tx_fifo, sizeof(s->tx_fifo));
347 for (i = 0; i < 31; i++) {
348 qemu_put_be32(f, s->rx[i].len);
349 qemu_put_buffer(f, s->rx[i].data, sizeof(s->rx[i].data));
350
351 }
352 qemu_put_be32(f, s->next_packet);
353 qemu_put_be32(f, s->rx_fifo - s->rx[s->next_packet].data);
354 qemu_put_be32(f, s->rx_fifo_len);
355}
356
357static int stellaris_enet_load(QEMUFile *f, void *opaque, int version_id)
358{
359 stellaris_enet_state *s = (stellaris_enet_state *)opaque;
360 int i;
361
362 if (version_id != 1)
363 return -EINVAL;
364
365 s->ris = qemu_get_be32(f);
366 s->im = qemu_get_be32(f);
367 s->rctl = qemu_get_be32(f);
368 s->tctl = qemu_get_be32(f);
369 s->thr = qemu_get_be32(f);
370 s->mctl = qemu_get_be32(f);
371 s->mdv = qemu_get_be32(f);
372 s->mtxd = qemu_get_be32(f);
373 s->mrxd = qemu_get_be32(f);
374 s->np = qemu_get_be32(f);
375 s->tx_frame_len = qemu_get_be32(f);
376 s->tx_fifo_len = qemu_get_be32(f);
377 qemu_get_buffer(f, s->tx_fifo, sizeof(s->tx_fifo));
378 for (i = 0; i < 31; i++) {
379 s->rx[i].len = qemu_get_be32(f);
380 qemu_get_buffer(f, s->rx[i].data, sizeof(s->rx[i].data));
381
382 }
383 s->next_packet = qemu_get_be32(f);
384 s->rx_fifo = s->rx[s->next_packet].data + qemu_get_be32(f);
385 s->rx_fifo_len = qemu_get_be32(f);
386
387 return 0;
388}
389
390static void stellaris_enet_cleanup(NetClientState *nc)
391{
392 stellaris_enet_state *s = qemu_get_nic_opaque(nc);
393
394 s->nic = NULL;
395}
396
397static NetClientInfo net_stellaris_enet_info = {
398 .type = NET_CLIENT_OPTIONS_KIND_NIC,
399 .size = sizeof(NICState),
400 .can_receive = stellaris_enet_can_receive,
401 .receive = stellaris_enet_receive,
402 .cleanup = stellaris_enet_cleanup,
403};
404
405static int stellaris_enet_init(SysBusDevice *sbd)
406{
407 DeviceState *dev = DEVICE(sbd);
408 stellaris_enet_state *s = STELLARIS_ENET(dev);
409
410 memory_region_init_io(&s->mmio, OBJECT(s), &stellaris_enet_ops, s,
411 "stellaris_enet", 0x1000);
412 sysbus_init_mmio(sbd, &s->mmio);
413 sysbus_init_irq(sbd, &s->irq);
414 qemu_macaddr_default_if_unset(&s->conf.macaddr);
415
416 s->nic = qemu_new_nic(&net_stellaris_enet_info, &s->conf,
417 object_get_typename(OBJECT(dev)), dev->id, s);
418 qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
419
420 stellaris_enet_reset(s);
421 register_savevm(dev, "stellaris_enet", -1, 1,
422 stellaris_enet_save, stellaris_enet_load, s);
423 return 0;
424}
425
426static void stellaris_enet_unrealize(DeviceState *dev, Error **errp)
427{
428 stellaris_enet_state *s = STELLARIS_ENET(dev);
429
430 unregister_savevm(DEVICE(s), "stellaris_enet", s);
431
432 memory_region_destroy(&s->mmio);
433}
434
435static Property stellaris_enet_properties[] = {
436 DEFINE_NIC_PROPERTIES(stellaris_enet_state, conf),
437 DEFINE_PROP_END_OF_LIST(),
438};
439
440static void stellaris_enet_class_init(ObjectClass *klass, void *data)
441{
442 DeviceClass *dc = DEVICE_CLASS(klass);
443 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
444
445 k->init = stellaris_enet_init;
446 dc->unrealize = stellaris_enet_unrealize;
447 dc->props = stellaris_enet_properties;
448}
449
450static const TypeInfo stellaris_enet_info = {
451 .name = TYPE_STELLARIS_ENET,
452 .parent = TYPE_SYS_BUS_DEVICE,
453 .instance_size = sizeof(stellaris_enet_state),
454 .class_init = stellaris_enet_class_init,
455};
456
457static void stellaris_enet_register_types(void)
458{
459 type_register_static(&stellaris_enet_info);
460}
461
462type_init(stellaris_enet_register_types)
463
