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