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8#include "hw.h"
9#include "net.h"
10#include "mcf.h"
11
12#include <zlib.h>
13
14
15
16#ifdef DEBUG_FEC
17#define DPRINTF(fmt, args...) \
18do { printf("mcf_fec: " fmt , ##args); } while (0)
19#else
20#define DPRINTF(fmt, args...) do {} while(0)
21#endif
22
23#define FEC_MAX_FRAME_SIZE 2032
24
25typedef struct {
26 qemu_irq *irq;
27 VLANClientState *vc;
28 uint32_t irq_state;
29 uint32_t eir;
30 uint32_t eimr;
31 int rx_enabled;
32 uint32_t rx_descriptor;
33 uint32_t tx_descriptor;
34 uint32_t ecr;
35 uint32_t mmfr;
36 uint32_t mscr;
37 uint32_t rcr;
38 uint32_t tcr;
39 uint32_t tfwr;
40 uint32_t rfsr;
41 uint32_t erdsr;
42 uint32_t etdsr;
43 uint32_t emrbr;
44 uint8_t macaddr[6];
45} mcf_fec_state;
46
47#define FEC_INT_HB 0x80000000
48#define FEC_INT_BABR 0x40000000
49#define FEC_INT_BABT 0x20000000
50#define FEC_INT_GRA 0x10000000
51#define FEC_INT_TXF 0x08000000
52#define FEC_INT_TXB 0x04000000
53#define FEC_INT_RXF 0x02000000
54#define FEC_INT_RXB 0x01000000
55#define FEC_INT_MII 0x00800000
56#define FEC_INT_EB 0x00400000
57#define FEC_INT_LC 0x00200000
58#define FEC_INT_RL 0x00100000
59#define FEC_INT_UN 0x00080000
60
61#define FEC_EN 2
62#define FEC_RESET 1
63
64
65#define FEC_NUM_IRQ 13
66static const uint32_t mcf_fec_irq_map[FEC_NUM_IRQ] = {
67 FEC_INT_TXF,
68 FEC_INT_TXB,
69 FEC_INT_UN,
70 FEC_INT_RL,
71 FEC_INT_RXF,
72 FEC_INT_RXB,
73 FEC_INT_MII,
74 FEC_INT_LC,
75 FEC_INT_HB,
76 FEC_INT_GRA,
77 FEC_INT_EB,
78 FEC_INT_BABT,
79 FEC_INT_BABR
80};
81
82
83typedef struct {
84 uint16_t flags;
85 uint16_t length;
86 uint32_t data;
87} mcf_fec_bd;
88
89#define FEC_BD_R 0x8000
90#define FEC_BD_E 0x8000
91#define FEC_BD_O1 0x4000
92#define FEC_BD_W 0x2000
93#define FEC_BD_O2 0x1000
94#define FEC_BD_L 0x0800
95#define FEC_BD_TC 0x0400
96#define FEC_BD_ABC 0x0200
97#define FEC_BD_M 0x0100
98#define FEC_BD_BC 0x0080
99#define FEC_BD_MC 0x0040
100#define FEC_BD_LG 0x0020
101#define FEC_BD_NO 0x0010
102#define FEC_BD_CR 0x0004
103#define FEC_BD_OV 0x0002
104#define FEC_BD_TR 0x0001
105
106static void mcf_fec_read_bd(mcf_fec_bd *bd, uint32_t addr)
107{
108 cpu_physical_memory_read(addr, (uint8_t *)bd, sizeof(*bd));
109 be16_to_cpus(&bd->flags);
110 be16_to_cpus(&bd->length);
111 be32_to_cpus(&bd->data);
112}
113
114static void mcf_fec_write_bd(mcf_fec_bd *bd, uint32_t addr)
115{
116 mcf_fec_bd tmp;
117 tmp.flags = cpu_to_be16(bd->flags);
118 tmp.length = cpu_to_be16(bd->length);
119 tmp.data = cpu_to_be32(bd->data);
120 cpu_physical_memory_write(addr, (uint8_t *)&tmp, sizeof(tmp));
121}
122
123static void mcf_fec_update(mcf_fec_state *s)
124{
125 uint32_t active;
126 uint32_t changed;
127 uint32_t mask;
128 int i;
129
130 active = s->eir & s->eimr;
131 changed = active ^s->irq_state;
132 for (i = 0; i < FEC_NUM_IRQ; i++) {
133 mask = mcf_fec_irq_map[i];
134 if (changed & mask) {
135 DPRINTF("IRQ %d = %d\n", i, (active & mask) != 0);
136 qemu_set_irq(s->irq[i], (active & mask) != 0);
137 }
138 }
139 s->irq_state = active;
140}
141
142static void mcf_fec_do_tx(mcf_fec_state *s)
143{
144 uint32_t addr;
145 mcf_fec_bd bd;
146 int frame_size;
147 int len;
148 uint8_t frame[FEC_MAX_FRAME_SIZE];
149 uint8_t *ptr;
150
151 DPRINTF("do_tx\n");
152 ptr = frame;
153 frame_size = 0;
154 addr = s->tx_descriptor;
155 while (1) {
156 mcf_fec_read_bd(&bd, addr);
157 DPRINTF("tx_bd %x flags %04x len %d data %08x\n",
158 addr, bd.flags, bd.length, bd.data);
159 if ((bd.flags & FEC_BD_R) == 0) {
160
161 break;
162 }
163 len = bd.length;
164 if (frame_size + len > FEC_MAX_FRAME_SIZE) {
165 len = FEC_MAX_FRAME_SIZE - frame_size;
166 s->eir |= FEC_INT_BABT;
167 }
168 cpu_physical_memory_read(bd.data, ptr, len);
169 ptr += len;
170 frame_size += len;
171 if (bd.flags & FEC_BD_L) {
172
173 DPRINTF("Sending packet\n");
174 qemu_send_packet(s->vc, frame, len);
175 ptr = frame;
176 frame_size = 0;
177 s->eir |= FEC_INT_TXF;
178 }
179 s->eir |= FEC_INT_TXB;
180 bd.flags &= ~FEC_BD_R;
181
182 mcf_fec_write_bd(&bd, addr);
183
184 if ((bd.flags & FEC_BD_W) != 0) {
185 addr = s->etdsr;
186 } else {
187 addr += 8;
188 }
189 }
190 s->tx_descriptor = addr;
191}
192
193static void mcf_fec_enable_rx(mcf_fec_state *s)
194{
195 mcf_fec_bd bd;
196
197 mcf_fec_read_bd(&bd, s->rx_descriptor);
198 s->rx_enabled = ((bd.flags & FEC_BD_E) != 0);
199 if (!s->rx_enabled)
200 DPRINTF("RX buffer full\n");
201}
202
203static void mcf_fec_reset(mcf_fec_state *s)
204{
205 s->eir = 0;
206 s->eimr = 0;
207 s->rx_enabled = 0;
208 s->ecr = 0;
209 s->mscr = 0;
210 s->rcr = 0x05ee0001;
211 s->tcr = 0;
212 s->tfwr = 0;
213 s->rfsr = 0x500;
214}
215
216static uint32_t mcf_fec_read(void *opaque, target_phys_addr_t addr)
217{
218 mcf_fec_state *s = (mcf_fec_state *)opaque;
219 switch (addr & 0x3ff) {
220 case 0x004: return s->eir;
221 case 0x008: return s->eimr;
222 case 0x010: return s->rx_enabled ? (1 << 24) : 0;
223 case 0x014: return 0;
224 case 0x024: return s->ecr;
225 case 0x040: return s->mmfr;
226 case 0x044: return s->mscr;
227 case 0x064: return 0;
228 case 0x084: return s->rcr;
229 case 0x0c4: return s->tcr;
230 case 0x0e4:
231 return (s->macaddr[0] << 24) | (s->macaddr[1] << 16)
232 | (s->macaddr[2] << 8) | s->macaddr[3];
233 break;
234 case 0x0e8:
235 return (s->macaddr[4] << 24) | (s->macaddr[5] << 16) | 0x8808;
236 case 0x0ec: return 0x10000;
237 case 0x118: return 0;
238 case 0x11c: return 0;
239 case 0x120: return 0;
240 case 0x124: return 0;
241 case 0x144: return s->tfwr;
242 case 0x14c: return 0x600;
243 case 0x150: return s->rfsr;
244 case 0x180: return s->erdsr;
245 case 0x184: return s->etdsr;
246 case 0x188: return s->emrbr;
247 default:
248 cpu_abort(cpu_single_env, "mcf_fec_read: Bad address 0x%x\n",
249 (int)addr);
250 return 0;
251 }
252}
253
254static void mcf_fec_write(void *opaque, target_phys_addr_t addr, uint32_t value)
255{
256 mcf_fec_state *s = (mcf_fec_state *)opaque;
257 switch (addr & 0x3ff) {
258 case 0x004:
259 s->eir &= ~value;
260 break;
261 case 0x008:
262 s->eimr = value;
263 break;
264 case 0x010:
265 if ((s->ecr & FEC_EN) && !s->rx_enabled) {
266 DPRINTF("RX enable\n");
267 mcf_fec_enable_rx(s);
268 }
269 break;
270 case 0x014:
271 if (s->ecr & FEC_EN) {
272 mcf_fec_do_tx(s);
273 }
274 break;
275 case 0x024:
276 s->ecr = value;
277 if (value & FEC_RESET) {
278 DPRINTF("Reset\n");
279 mcf_fec_reset(s);
280 }
281 if ((s->ecr & FEC_EN) == 0) {
282 s->rx_enabled = 0;
283 }
284 break;
285 case 0x040:
286
287 s->mmfr = value;
288 break;
289 case 0x044:
290 s->mscr = value & 0xfe;
291 break;
292 case 0x064:
293
294 break;
295 case 0x084:
296 s->rcr = value & 0x07ff003f;
297
298 break;
299 case 0x0c4:
300
301 s->tcr = value;
302 if (value & 1)
303 s->eir |= FEC_INT_GRA;
304 break;
305 case 0x0e4:
306 s->macaddr[0] = value >> 24;
307 s->macaddr[1] = value >> 16;
308 s->macaddr[2] = value >> 8;
309 s->macaddr[3] = value;
310 break;
311 case 0x0e8:
312 s->macaddr[4] = value >> 24;
313 s->macaddr[5] = value >> 16;
314 break;
315 case 0x0ec:
316
317 break;
318 case 0x118:
319 case 0x11c:
320 case 0x120:
321 case 0x124:
322
323 break;
324 case 0x144:
325 s->tfwr = value & 3;
326 break;
327 case 0x14c:
328
329 break;
330 case 0x150:
331 s->rfsr = (value & 0x3fc) | 0x400;
332 break;
333 case 0x180:
334 s->erdsr = value & ~3;
335 s->rx_descriptor = s->erdsr;
336 break;
337 case 0x184:
338 s->etdsr = value & ~3;
339 s->tx_descriptor = s->etdsr;
340 break;
341 case 0x188:
342 s->emrbr = value & 0x7f0;
343 break;
344 default:
345 cpu_abort(cpu_single_env, "mcf_fec_write Bad address 0x%x\n",
346 (int)addr);
347 }
348 mcf_fec_update(s);
349}
350
351static int mcf_fec_can_receive(void *opaque)
352{
353 mcf_fec_state *s = (mcf_fec_state *)opaque;
354 return s->rx_enabled;
355}
356
357static void mcf_fec_receive(void *opaque, const uint8_t *buf, int size)
358{
359 mcf_fec_state *s = (mcf_fec_state *)opaque;
360 mcf_fec_bd bd;
361 uint32_t flags = 0;
362 uint32_t addr;
363 uint32_t crc;
364 uint32_t buf_addr;
365 uint8_t *crc_ptr;
366 unsigned int buf_len;
367
368 DPRINTF("do_rx len %d\n", size);
369 if (!s->rx_enabled) {
370 fprintf(stderr, "mcf_fec_receive: Unexpected packet\n");
371 }
372
373 size += 4;
374 crc = cpu_to_be32(crc32(~0, buf, size));
375 crc_ptr = (uint8_t *)&crc;
376
377 if (size > FEC_MAX_FRAME_SIZE) {
378 size = FEC_MAX_FRAME_SIZE;
379 flags |= FEC_BD_TR | FEC_BD_LG;
380 }
381
382 if (size > (s->rcr >> 16)) {
383 flags |= FEC_BD_LG;
384 }
385 addr = s->rx_descriptor;
386 while (size > 0) {
387 mcf_fec_read_bd(&bd, addr);
388 if ((bd.flags & FEC_BD_E) == 0) {
389
390
391
392
393 fprintf(stderr, "mcf_fec: Lost end of frame\n");
394 break;
395 }
396 buf_len = (size <= s->emrbr) ? size: s->emrbr;
397 bd.length = buf_len;
398 size -= buf_len;
399 DPRINTF("rx_bd %x length %d\n", addr, bd.length);
400
401 if (size < 4)
402 buf_len += size - 4;
403 buf_addr = bd.data;
404 cpu_physical_memory_write(buf_addr, buf, buf_len);
405 buf += buf_len;
406 if (size < 4) {
407 cpu_physical_memory_write(buf_addr + buf_len, crc_ptr, 4 - size);
408 crc_ptr += 4 - size;
409 }
410 bd.flags &= ~FEC_BD_E;
411 if (size == 0) {
412
413 bd.flags |= flags | FEC_BD_L;
414 DPRINTF("rx frame flags %04x\n", bd.flags);
415 s->eir |= FEC_INT_RXF;
416 } else {
417 s->eir |= FEC_INT_RXB;
418 }
419 mcf_fec_write_bd(&bd, addr);
420
421 if ((bd.flags & FEC_BD_W) != 0) {
422 addr = s->erdsr;
423 } else {
424 addr += 8;
425 }
426 }
427 s->rx_descriptor = addr;
428 mcf_fec_enable_rx(s);
429 mcf_fec_update(s);
430}
431
432static CPUReadMemoryFunc *mcf_fec_readfn[] = {
433 mcf_fec_read,
434 mcf_fec_read,
435 mcf_fec_read
436};
437
438static CPUWriteMemoryFunc *mcf_fec_writefn[] = {
439 mcf_fec_write,
440 mcf_fec_write,
441 mcf_fec_write
442};
443
444void mcf_fec_init(NICInfo *nd, target_phys_addr_t base, qemu_irq *irq)
445{
446 mcf_fec_state *s;
447 int iomemtype;
448
449 qemu_check_nic_model(nd, "mcf_fec");
450
451 s = (mcf_fec_state *)qemu_mallocz(sizeof(mcf_fec_state));
452 s->irq = irq;
453 iomemtype = cpu_register_io_memory(0, mcf_fec_readfn,
454 mcf_fec_writefn, s);
455 cpu_register_physical_memory(base, 0x400, iomemtype);
456
457 s->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
458 mcf_fec_receive, mcf_fec_can_receive, s);
459 memcpy(s->macaddr, nd->macaddr, 6);
460 qemu_format_nic_info_str(s->vc, s->macaddr);
461}
462
