sm501: Add missing arbitration control register
[qemu.git] / hw / net / dp8393x.c
1 /*
2 * QEMU NS SONIC DP8393x netcard
3 *
4 * Copyright (c) 2008-2009 Herve Poussineau
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 of
9 * the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "qemu/osdep.h"
21 #include "hw/sysbus.h"
22 #include "hw/devices.h"
23 #include "net/net.h"
24 #include "qapi/error.h"
25 #include "qemu/timer.h"
26 #include <zlib.h>
27
28 //#define DEBUG_SONIC
29
30 #define SONIC_PROM_SIZE 0x1000
31
32 #ifdef DEBUG_SONIC
33 #define DPRINTF(fmt, ...) \
34 do { printf("sonic: " fmt , ## __VA_ARGS__); } while (0)
35 static const char* reg_names[] = {
36 "CR", "DCR", "RCR", "TCR", "IMR", "ISR", "UTDA", "CTDA",
37 "TPS", "TFC", "TSA0", "TSA1", "TFS", "URDA", "CRDA", "CRBA0",
38 "CRBA1", "RBWC0", "RBWC1", "EOBC", "URRA", "RSA", "REA", "RRP",
39 "RWP", "TRBA0", "TRBA1", "0x1b", "0x1c", "0x1d", "0x1e", "LLFA",
40 "TTDA", "CEP", "CAP2", "CAP1", "CAP0", "CE", "CDP", "CDC",
41 "SR", "WT0", "WT1", "RSC", "CRCT", "FAET", "MPT", "MDT",
42 "0x30", "0x31", "0x32", "0x33", "0x34", "0x35", "0x36", "0x37",
43 "0x38", "0x39", "0x3a", "0x3b", "0x3c", "0x3d", "0x3e", "DCR2" };
44 #else
45 #define DPRINTF(fmt, ...) do {} while (0)
46 #endif
47
48 #define SONIC_ERROR(fmt, ...) \
49 do { printf("sonic ERROR: %s: " fmt, __func__ , ## __VA_ARGS__); } while (0)
50
51 #define SONIC_CR 0x00
52 #define SONIC_DCR 0x01
53 #define SONIC_RCR 0x02
54 #define SONIC_TCR 0x03
55 #define SONIC_IMR 0x04
56 #define SONIC_ISR 0x05
57 #define SONIC_UTDA 0x06
58 #define SONIC_CTDA 0x07
59 #define SONIC_TPS 0x08
60 #define SONIC_TFC 0x09
61 #define SONIC_TSA0 0x0a
62 #define SONIC_TSA1 0x0b
63 #define SONIC_TFS 0x0c
64 #define SONIC_URDA 0x0d
65 #define SONIC_CRDA 0x0e
66 #define SONIC_CRBA0 0x0f
67 #define SONIC_CRBA1 0x10
68 #define SONIC_RBWC0 0x11
69 #define SONIC_RBWC1 0x12
70 #define SONIC_EOBC 0x13
71 #define SONIC_URRA 0x14
72 #define SONIC_RSA 0x15
73 #define SONIC_REA 0x16
74 #define SONIC_RRP 0x17
75 #define SONIC_RWP 0x18
76 #define SONIC_TRBA0 0x19
77 #define SONIC_TRBA1 0x1a
78 #define SONIC_LLFA 0x1f
79 #define SONIC_TTDA 0x20
80 #define SONIC_CEP 0x21
81 #define SONIC_CAP2 0x22
82 #define SONIC_CAP1 0x23
83 #define SONIC_CAP0 0x24
84 #define SONIC_CE 0x25
85 #define SONIC_CDP 0x26
86 #define SONIC_CDC 0x27
87 #define SONIC_SR 0x28
88 #define SONIC_WT0 0x29
89 #define SONIC_WT1 0x2a
90 #define SONIC_RSC 0x2b
91 #define SONIC_CRCT 0x2c
92 #define SONIC_FAET 0x2d
93 #define SONIC_MPT 0x2e
94 #define SONIC_MDT 0x2f
95 #define SONIC_DCR2 0x3f
96
97 #define SONIC_CR_HTX 0x0001
98 #define SONIC_CR_TXP 0x0002
99 #define SONIC_CR_RXDIS 0x0004
100 #define SONIC_CR_RXEN 0x0008
101 #define SONIC_CR_STP 0x0010
102 #define SONIC_CR_ST 0x0020
103 #define SONIC_CR_RST 0x0080
104 #define SONIC_CR_RRRA 0x0100
105 #define SONIC_CR_LCAM 0x0200
106 #define SONIC_CR_MASK 0x03bf
107
108 #define SONIC_DCR_DW 0x0020
109 #define SONIC_DCR_LBR 0x2000
110 #define SONIC_DCR_EXBUS 0x8000
111
112 #define SONIC_RCR_PRX 0x0001
113 #define SONIC_RCR_LBK 0x0002
114 #define SONIC_RCR_FAER 0x0004
115 #define SONIC_RCR_CRCR 0x0008
116 #define SONIC_RCR_CRS 0x0020
117 #define SONIC_RCR_LPKT 0x0040
118 #define SONIC_RCR_BC 0x0080
119 #define SONIC_RCR_MC 0x0100
120 #define SONIC_RCR_LB0 0x0200
121 #define SONIC_RCR_LB1 0x0400
122 #define SONIC_RCR_AMC 0x0800
123 #define SONIC_RCR_PRO 0x1000
124 #define SONIC_RCR_BRD 0x2000
125 #define SONIC_RCR_RNT 0x4000
126
127 #define SONIC_TCR_PTX 0x0001
128 #define SONIC_TCR_BCM 0x0002
129 #define SONIC_TCR_FU 0x0004
130 #define SONIC_TCR_EXC 0x0040
131 #define SONIC_TCR_CRSL 0x0080
132 #define SONIC_TCR_NCRS 0x0100
133 #define SONIC_TCR_EXD 0x0400
134 #define SONIC_TCR_CRCI 0x2000
135 #define SONIC_TCR_PINT 0x8000
136
137 #define SONIC_ISR_RBE 0x0020
138 #define SONIC_ISR_RDE 0x0040
139 #define SONIC_ISR_TC 0x0080
140 #define SONIC_ISR_TXDN 0x0200
141 #define SONIC_ISR_PKTRX 0x0400
142 #define SONIC_ISR_PINT 0x0800
143 #define SONIC_ISR_LCD 0x1000
144
145 #define TYPE_DP8393X "dp8393x"
146 #define DP8393X(obj) OBJECT_CHECK(dp8393xState, (obj), TYPE_DP8393X)
147
148 typedef struct dp8393xState {
149 SysBusDevice parent_obj;
150
151 /* Hardware */
152 uint8_t it_shift;
153 qemu_irq irq;
154 #ifdef DEBUG_SONIC
155 int irq_level;
156 #endif
157 QEMUTimer *watchdog;
158 int64_t wt_last_update;
159 NICConf conf;
160 NICState *nic;
161 MemoryRegion mmio;
162 MemoryRegion prom;
163
164 /* Registers */
165 uint8_t cam[16][6];
166 uint16_t regs[0x40];
167
168 /* Temporaries */
169 uint8_t tx_buffer[0x10000];
170 int loopback_packet;
171
172 /* Memory access */
173 void *dma_mr;
174 AddressSpace as;
175 } dp8393xState;
176
177 /* Accessor functions for values which are formed by
178 * concatenating two 16 bit device registers. By putting these
179 * in their own functions with a uint32_t return type we avoid the
180 * pitfall of implicit sign extension where ((x << 16) | y) is a
181 * signed 32 bit integer that might get sign-extended to a 64 bit integer.
182 */
183 static uint32_t dp8393x_cdp(dp8393xState *s)
184 {
185 return (s->regs[SONIC_URRA] << 16) | s->regs[SONIC_CDP];
186 }
187
188 static uint32_t dp8393x_crba(dp8393xState *s)
189 {
190 return (s->regs[SONIC_CRBA1] << 16) | s->regs[SONIC_CRBA0];
191 }
192
193 static uint32_t dp8393x_crda(dp8393xState *s)
194 {
195 return (s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA];
196 }
197
198 static uint32_t dp8393x_rbwc(dp8393xState *s)
199 {
200 return (s->regs[SONIC_RBWC1] << 16) | s->regs[SONIC_RBWC0];
201 }
202
203 static uint32_t dp8393x_rrp(dp8393xState *s)
204 {
205 return (s->regs[SONIC_URRA] << 16) | s->regs[SONIC_RRP];
206 }
207
208 static uint32_t dp8393x_tsa(dp8393xState *s)
209 {
210 return (s->regs[SONIC_TSA1] << 16) | s->regs[SONIC_TSA0];
211 }
212
213 static uint32_t dp8393x_ttda(dp8393xState *s)
214 {
215 return (s->regs[SONIC_UTDA] << 16) | s->regs[SONIC_TTDA];
216 }
217
218 static uint32_t dp8393x_wt(dp8393xState *s)
219 {
220 return s->regs[SONIC_WT1] << 16 | s->regs[SONIC_WT0];
221 }
222
223 static void dp8393x_update_irq(dp8393xState *s)
224 {
225 int level = (s->regs[SONIC_IMR] & s->regs[SONIC_ISR]) ? 1 : 0;
226
227 #ifdef DEBUG_SONIC
228 if (level != s->irq_level) {
229 s->irq_level = level;
230 if (level) {
231 DPRINTF("raise irq, isr is 0x%04x\n", s->regs[SONIC_ISR]);
232 } else {
233 DPRINTF("lower irq\n");
234 }
235 }
236 #endif
237
238 qemu_set_irq(s->irq, level);
239 }
240
241 static void dp8393x_do_load_cam(dp8393xState *s)
242 {
243 uint16_t data[8];
244 int width, size;
245 uint16_t index = 0;
246
247 width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
248 size = sizeof(uint16_t) * 4 * width;
249
250 while (s->regs[SONIC_CDC] & 0x1f) {
251 /* Fill current entry */
252 address_space_rw(&s->as, dp8393x_cdp(s),
253 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
254 s->cam[index][0] = data[1 * width] & 0xff;
255 s->cam[index][1] = data[1 * width] >> 8;
256 s->cam[index][2] = data[2 * width] & 0xff;
257 s->cam[index][3] = data[2 * width] >> 8;
258 s->cam[index][4] = data[3 * width] & 0xff;
259 s->cam[index][5] = data[3 * width] >> 8;
260 DPRINTF("load cam[%d] with %02x%02x%02x%02x%02x%02x\n", index,
261 s->cam[index][0], s->cam[index][1], s->cam[index][2],
262 s->cam[index][3], s->cam[index][4], s->cam[index][5]);
263 /* Move to next entry */
264 s->regs[SONIC_CDC]--;
265 s->regs[SONIC_CDP] += size;
266 index++;
267 }
268
269 /* Read CAM enable */
270 address_space_rw(&s->as, dp8393x_cdp(s),
271 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
272 s->regs[SONIC_CE] = data[0 * width];
273 DPRINTF("load cam done. cam enable mask 0x%04x\n", s->regs[SONIC_CE]);
274
275 /* Done */
276 s->regs[SONIC_CR] &= ~SONIC_CR_LCAM;
277 s->regs[SONIC_ISR] |= SONIC_ISR_LCD;
278 dp8393x_update_irq(s);
279 }
280
281 static void dp8393x_do_read_rra(dp8393xState *s)
282 {
283 uint16_t data[8];
284 int width, size;
285
286 /* Read memory */
287 width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
288 size = sizeof(uint16_t) * 4 * width;
289 address_space_rw(&s->as, dp8393x_rrp(s),
290 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
291
292 /* Update SONIC registers */
293 s->regs[SONIC_CRBA0] = data[0 * width];
294 s->regs[SONIC_CRBA1] = data[1 * width];
295 s->regs[SONIC_RBWC0] = data[2 * width];
296 s->regs[SONIC_RBWC1] = data[3 * width];
297 DPRINTF("CRBA0/1: 0x%04x/0x%04x, RBWC0/1: 0x%04x/0x%04x\n",
298 s->regs[SONIC_CRBA0], s->regs[SONIC_CRBA1],
299 s->regs[SONIC_RBWC0], s->regs[SONIC_RBWC1]);
300
301 /* Go to next entry */
302 s->regs[SONIC_RRP] += size;
303
304 /* Handle wrap */
305 if (s->regs[SONIC_RRP] == s->regs[SONIC_REA]) {
306 s->regs[SONIC_RRP] = s->regs[SONIC_RSA];
307 }
308
309 /* Check resource exhaustion */
310 if (s->regs[SONIC_RRP] == s->regs[SONIC_RWP])
311 {
312 s->regs[SONIC_ISR] |= SONIC_ISR_RBE;
313 dp8393x_update_irq(s);
314 }
315
316 /* Done */
317 s->regs[SONIC_CR] &= ~SONIC_CR_RRRA;
318 }
319
320 static void dp8393x_do_software_reset(dp8393xState *s)
321 {
322 timer_del(s->watchdog);
323
324 s->regs[SONIC_CR] &= ~(SONIC_CR_LCAM | SONIC_CR_RRRA | SONIC_CR_TXP | SONIC_CR_HTX);
325 s->regs[SONIC_CR] |= SONIC_CR_RST | SONIC_CR_RXDIS;
326 }
327
328 static void dp8393x_set_next_tick(dp8393xState *s)
329 {
330 uint32_t ticks;
331 int64_t delay;
332
333 if (s->regs[SONIC_CR] & SONIC_CR_STP) {
334 timer_del(s->watchdog);
335 return;
336 }
337
338 ticks = dp8393x_wt(s);
339 s->wt_last_update = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
340 delay = NANOSECONDS_PER_SECOND * ticks / 5000000;
341 timer_mod(s->watchdog, s->wt_last_update + delay);
342 }
343
344 static void dp8393x_update_wt_regs(dp8393xState *s)
345 {
346 int64_t elapsed;
347 uint32_t val;
348
349 if (s->regs[SONIC_CR] & SONIC_CR_STP) {
350 timer_del(s->watchdog);
351 return;
352 }
353
354 elapsed = s->wt_last_update - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
355 val = dp8393x_wt(s);
356 val -= elapsed / 5000000;
357 s->regs[SONIC_WT1] = (val >> 16) & 0xffff;
358 s->regs[SONIC_WT0] = (val >> 0) & 0xffff;
359 dp8393x_set_next_tick(s);
360
361 }
362
363 static void dp8393x_do_start_timer(dp8393xState *s)
364 {
365 s->regs[SONIC_CR] &= ~SONIC_CR_STP;
366 dp8393x_set_next_tick(s);
367 }
368
369 static void dp8393x_do_stop_timer(dp8393xState *s)
370 {
371 s->regs[SONIC_CR] &= ~SONIC_CR_ST;
372 dp8393x_update_wt_regs(s);
373 }
374
375 static int dp8393x_can_receive(NetClientState *nc);
376
377 static void dp8393x_do_receiver_enable(dp8393xState *s)
378 {
379 s->regs[SONIC_CR] &= ~SONIC_CR_RXDIS;
380 if (dp8393x_can_receive(s->nic->ncs)) {
381 qemu_flush_queued_packets(qemu_get_queue(s->nic));
382 }
383 }
384
385 static void dp8393x_do_receiver_disable(dp8393xState *s)
386 {
387 s->regs[SONIC_CR] &= ~SONIC_CR_RXEN;
388 }
389
390 static void dp8393x_do_transmit_packets(dp8393xState *s)
391 {
392 NetClientState *nc = qemu_get_queue(s->nic);
393 uint16_t data[12];
394 int width, size;
395 int tx_len, len;
396 uint16_t i;
397
398 width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
399
400 while (1) {
401 /* Read memory */
402 size = sizeof(uint16_t) * 6 * width;
403 s->regs[SONIC_TTDA] = s->regs[SONIC_CTDA];
404 DPRINTF("Transmit packet at %08x\n", dp8393x_ttda(s));
405 address_space_rw(&s->as,
406 dp8393x_ttda(s) + sizeof(uint16_t) * width,
407 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
408 tx_len = 0;
409
410 /* Update registers */
411 s->regs[SONIC_TCR] = data[0 * width] & 0xf000;
412 s->regs[SONIC_TPS] = data[1 * width];
413 s->regs[SONIC_TFC] = data[2 * width];
414 s->regs[SONIC_TSA0] = data[3 * width];
415 s->regs[SONIC_TSA1] = data[4 * width];
416 s->regs[SONIC_TFS] = data[5 * width];
417
418 /* Handle programmable interrupt */
419 if (s->regs[SONIC_TCR] & SONIC_TCR_PINT) {
420 s->regs[SONIC_ISR] |= SONIC_ISR_PINT;
421 } else {
422 s->regs[SONIC_ISR] &= ~SONIC_ISR_PINT;
423 }
424
425 for (i = 0; i < s->regs[SONIC_TFC]; ) {
426 /* Append fragment */
427 len = s->regs[SONIC_TFS];
428 if (tx_len + len > sizeof(s->tx_buffer)) {
429 len = sizeof(s->tx_buffer) - tx_len;
430 }
431 address_space_rw(&s->as, dp8393x_tsa(s),
432 MEMTXATTRS_UNSPECIFIED, &s->tx_buffer[tx_len], len, 0);
433 tx_len += len;
434
435 i++;
436 if (i != s->regs[SONIC_TFC]) {
437 /* Read next fragment details */
438 size = sizeof(uint16_t) * 3 * width;
439 address_space_rw(&s->as,
440 dp8393x_ttda(s) + sizeof(uint16_t) * (4 + 3 * i) * width,
441 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
442 s->regs[SONIC_TSA0] = data[0 * width];
443 s->regs[SONIC_TSA1] = data[1 * width];
444 s->regs[SONIC_TFS] = data[2 * width];
445 }
446 }
447
448 /* Handle Ethernet checksum */
449 if (!(s->regs[SONIC_TCR] & SONIC_TCR_CRCI)) {
450 /* Don't append FCS there, to look like slirp packets
451 * which don't have one */
452 } else {
453 /* Remove existing FCS */
454 tx_len -= 4;
455 }
456
457 if (s->regs[SONIC_RCR] & (SONIC_RCR_LB1 | SONIC_RCR_LB0)) {
458 /* Loopback */
459 s->regs[SONIC_TCR] |= SONIC_TCR_CRSL;
460 if (nc->info->can_receive(nc)) {
461 s->loopback_packet = 1;
462 nc->info->receive(nc, s->tx_buffer, tx_len);
463 }
464 } else {
465 /* Transmit packet */
466 qemu_send_packet(nc, s->tx_buffer, tx_len);
467 }
468 s->regs[SONIC_TCR] |= SONIC_TCR_PTX;
469
470 /* Write status */
471 data[0 * width] = s->regs[SONIC_TCR] & 0x0fff; /* status */
472 size = sizeof(uint16_t) * width;
473 address_space_rw(&s->as,
474 dp8393x_ttda(s),
475 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 1);
476
477 if (!(s->regs[SONIC_CR] & SONIC_CR_HTX)) {
478 /* Read footer of packet */
479 size = sizeof(uint16_t) * width;
480 address_space_rw(&s->as,
481 dp8393x_ttda(s) +
482 sizeof(uint16_t) *
483 (4 + 3 * s->regs[SONIC_TFC]) * width,
484 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
485 s->regs[SONIC_CTDA] = data[0 * width] & ~0x1;
486 if (data[0 * width] & 0x1) {
487 /* EOL detected */
488 break;
489 }
490 }
491 }
492
493 /* Done */
494 s->regs[SONIC_CR] &= ~SONIC_CR_TXP;
495 s->regs[SONIC_ISR] |= SONIC_ISR_TXDN;
496 dp8393x_update_irq(s);
497 }
498
499 static void dp8393x_do_halt_transmission(dp8393xState *s)
500 {
501 /* Nothing to do */
502 }
503
504 static void dp8393x_do_command(dp8393xState *s, uint16_t command)
505 {
506 if ((s->regs[SONIC_CR] & SONIC_CR_RST) && !(command & SONIC_CR_RST)) {
507 s->regs[SONIC_CR] &= ~SONIC_CR_RST;
508 return;
509 }
510
511 s->regs[SONIC_CR] |= (command & SONIC_CR_MASK);
512
513 if (command & SONIC_CR_HTX)
514 dp8393x_do_halt_transmission(s);
515 if (command & SONIC_CR_TXP)
516 dp8393x_do_transmit_packets(s);
517 if (command & SONIC_CR_RXDIS)
518 dp8393x_do_receiver_disable(s);
519 if (command & SONIC_CR_RXEN)
520 dp8393x_do_receiver_enable(s);
521 if (command & SONIC_CR_STP)
522 dp8393x_do_stop_timer(s);
523 if (command & SONIC_CR_ST)
524 dp8393x_do_start_timer(s);
525 if (command & SONIC_CR_RST)
526 dp8393x_do_software_reset(s);
527 if (command & SONIC_CR_RRRA)
528 dp8393x_do_read_rra(s);
529 if (command & SONIC_CR_LCAM)
530 dp8393x_do_load_cam(s);
531 }
532
533 static uint64_t dp8393x_read(void *opaque, hwaddr addr, unsigned int size)
534 {
535 dp8393xState *s = opaque;
536 int reg = addr >> s->it_shift;
537 uint16_t val = 0;
538
539 switch (reg) {
540 /* Update data before reading it */
541 case SONIC_WT0:
542 case SONIC_WT1:
543 dp8393x_update_wt_regs(s);
544 val = s->regs[reg];
545 break;
546 /* Accept read to some registers only when in reset mode */
547 case SONIC_CAP2:
548 case SONIC_CAP1:
549 case SONIC_CAP0:
550 if (s->regs[SONIC_CR] & SONIC_CR_RST) {
551 val = s->cam[s->regs[SONIC_CEP] & 0xf][2* (SONIC_CAP0 - reg) + 1] << 8;
552 val |= s->cam[s->regs[SONIC_CEP] & 0xf][2* (SONIC_CAP0 - reg)];
553 }
554 break;
555 /* All other registers have no special contrainst */
556 default:
557 val = s->regs[reg];
558 }
559
560 DPRINTF("read 0x%04x from reg %s\n", val, reg_names[reg]);
561
562 return val;
563 }
564
565 static void dp8393x_write(void *opaque, hwaddr addr, uint64_t data,
566 unsigned int size)
567 {
568 dp8393xState *s = opaque;
569 int reg = addr >> s->it_shift;
570
571 DPRINTF("write 0x%04x to reg %s\n", (uint16_t)data, reg_names[reg]);
572
573 switch (reg) {
574 /* Command register */
575 case SONIC_CR:
576 dp8393x_do_command(s, data);
577 break;
578 /* Prevent write to read-only registers */
579 case SONIC_CAP2:
580 case SONIC_CAP1:
581 case SONIC_CAP0:
582 case SONIC_SR:
583 case SONIC_MDT:
584 DPRINTF("writing to reg %d invalid\n", reg);
585 break;
586 /* Accept write to some registers only when in reset mode */
587 case SONIC_DCR:
588 if (s->regs[SONIC_CR] & SONIC_CR_RST) {
589 s->regs[reg] = data & 0xbfff;
590 } else {
591 DPRINTF("writing to DCR invalid\n");
592 }
593 break;
594 case SONIC_DCR2:
595 if (s->regs[SONIC_CR] & SONIC_CR_RST) {
596 s->regs[reg] = data & 0xf017;
597 } else {
598 DPRINTF("writing to DCR2 invalid\n");
599 }
600 break;
601 /* 12 lower bytes are Read Only */
602 case SONIC_TCR:
603 s->regs[reg] = data & 0xf000;
604 break;
605 /* 9 lower bytes are Read Only */
606 case SONIC_RCR:
607 s->regs[reg] = data & 0xffe0;
608 break;
609 /* Ignore most significant bit */
610 case SONIC_IMR:
611 s->regs[reg] = data & 0x7fff;
612 dp8393x_update_irq(s);
613 break;
614 /* Clear bits by writing 1 to them */
615 case SONIC_ISR:
616 data &= s->regs[reg];
617 s->regs[reg] &= ~data;
618 if (data & SONIC_ISR_RBE) {
619 dp8393x_do_read_rra(s);
620 }
621 dp8393x_update_irq(s);
622 if (dp8393x_can_receive(s->nic->ncs)) {
623 qemu_flush_queued_packets(qemu_get_queue(s->nic));
624 }
625 break;
626 /* Ignore least significant bit */
627 case SONIC_RSA:
628 case SONIC_REA:
629 case SONIC_RRP:
630 case SONIC_RWP:
631 s->regs[reg] = data & 0xfffe;
632 break;
633 /* Invert written value for some registers */
634 case SONIC_CRCT:
635 case SONIC_FAET:
636 case SONIC_MPT:
637 s->regs[reg] = data ^ 0xffff;
638 break;
639 /* All other registers have no special contrainst */
640 default:
641 s->regs[reg] = data;
642 }
643
644 if (reg == SONIC_WT0 || reg == SONIC_WT1) {
645 dp8393x_set_next_tick(s);
646 }
647 }
648
649 static const MemoryRegionOps dp8393x_ops = {
650 .read = dp8393x_read,
651 .write = dp8393x_write,
652 .impl.min_access_size = 2,
653 .impl.max_access_size = 2,
654 .endianness = DEVICE_NATIVE_ENDIAN,
655 };
656
657 static void dp8393x_watchdog(void *opaque)
658 {
659 dp8393xState *s = opaque;
660
661 if (s->regs[SONIC_CR] & SONIC_CR_STP) {
662 return;
663 }
664
665 s->regs[SONIC_WT1] = 0xffff;
666 s->regs[SONIC_WT0] = 0xffff;
667 dp8393x_set_next_tick(s);
668
669 /* Signal underflow */
670 s->regs[SONIC_ISR] |= SONIC_ISR_TC;
671 dp8393x_update_irq(s);
672 }
673
674 static int dp8393x_can_receive(NetClientState *nc)
675 {
676 dp8393xState *s = qemu_get_nic_opaque(nc);
677
678 if (!(s->regs[SONIC_CR] & SONIC_CR_RXEN))
679 return 0;
680 if (s->regs[SONIC_ISR] & SONIC_ISR_RBE)
681 return 0;
682 return 1;
683 }
684
685 static int dp8393x_receive_filter(dp8393xState *s, const uint8_t * buf,
686 int size)
687 {
688 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
689 int i;
690
691 /* Check promiscuous mode */
692 if ((s->regs[SONIC_RCR] & SONIC_RCR_PRO) && (buf[0] & 1) == 0) {
693 return 0;
694 }
695
696 /* Check multicast packets */
697 if ((s->regs[SONIC_RCR] & SONIC_RCR_AMC) && (buf[0] & 1) == 1) {
698 return SONIC_RCR_MC;
699 }
700
701 /* Check broadcast */
702 if ((s->regs[SONIC_RCR] & SONIC_RCR_BRD) && !memcmp(buf, bcast, sizeof(bcast))) {
703 return SONIC_RCR_BC;
704 }
705
706 /* Check CAM */
707 for (i = 0; i < 16; i++) {
708 if (s->regs[SONIC_CE] & (1 << i)) {
709 /* Entry enabled */
710 if (!memcmp(buf, s->cam[i], sizeof(s->cam[i]))) {
711 return 0;
712 }
713 }
714 }
715
716 return -1;
717 }
718
719 static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
720 size_t size)
721 {
722 dp8393xState *s = qemu_get_nic_opaque(nc);
723 uint16_t data[10];
724 int packet_type;
725 uint32_t available, address;
726 int width, rx_len = size;
727 uint32_t checksum;
728
729 width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
730
731 s->regs[SONIC_RCR] &= ~(SONIC_RCR_PRX | SONIC_RCR_LBK | SONIC_RCR_FAER |
732 SONIC_RCR_CRCR | SONIC_RCR_LPKT | SONIC_RCR_BC | SONIC_RCR_MC);
733
734 packet_type = dp8393x_receive_filter(s, buf, size);
735 if (packet_type < 0) {
736 DPRINTF("packet not for netcard\n");
737 return -1;
738 }
739
740 /* XXX: Check byte ordering */
741
742 /* Check for EOL */
743 if (s->regs[SONIC_LLFA] & 0x1) {
744 /* Are we still in resource exhaustion? */
745 size = sizeof(uint16_t) * 1 * width;
746 address = dp8393x_crda(s) + sizeof(uint16_t) * 5 * width;
747 address_space_rw(&s->as, address, MEMTXATTRS_UNSPECIFIED,
748 (uint8_t *)data, size, 0);
749 if (data[0 * width] & 0x1) {
750 /* Still EOL ; stop reception */
751 return -1;
752 } else {
753 s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
754 }
755 }
756
757 /* Save current position */
758 s->regs[SONIC_TRBA1] = s->regs[SONIC_CRBA1];
759 s->regs[SONIC_TRBA0] = s->regs[SONIC_CRBA0];
760
761 /* Calculate the ethernet checksum */
762 checksum = cpu_to_le32(crc32(0, buf, rx_len));
763
764 /* Put packet into RBA */
765 DPRINTF("Receive packet at %08x\n", dp8393x_crba(s));
766 address = dp8393x_crba(s);
767 address_space_rw(&s->as, address,
768 MEMTXATTRS_UNSPECIFIED, (uint8_t *)buf, rx_len, 1);
769 address += rx_len;
770 address_space_rw(&s->as, address,
771 MEMTXATTRS_UNSPECIFIED, (uint8_t *)&checksum, 4, 1);
772 rx_len += 4;
773 s->regs[SONIC_CRBA1] = address >> 16;
774 s->regs[SONIC_CRBA0] = address & 0xffff;
775 available = dp8393x_rbwc(s);
776 available -= rx_len / 2;
777 s->regs[SONIC_RBWC1] = available >> 16;
778 s->regs[SONIC_RBWC0] = available & 0xffff;
779
780 /* Update status */
781 if (dp8393x_rbwc(s) < s->regs[SONIC_EOBC]) {
782 s->regs[SONIC_RCR] |= SONIC_RCR_LPKT;
783 }
784 s->regs[SONIC_RCR] |= packet_type;
785 s->regs[SONIC_RCR] |= SONIC_RCR_PRX;
786 if (s->loopback_packet) {
787 s->regs[SONIC_RCR] |= SONIC_RCR_LBK;
788 s->loopback_packet = 0;
789 }
790
791 /* Write status to memory */
792 DPRINTF("Write status at %08x\n", dp8393x_crda(s));
793 data[0 * width] = s->regs[SONIC_RCR]; /* status */
794 data[1 * width] = rx_len; /* byte count */
795 data[2 * width] = s->regs[SONIC_TRBA0]; /* pkt_ptr0 */
796 data[3 * width] = s->regs[SONIC_TRBA1]; /* pkt_ptr1 */
797 data[4 * width] = s->regs[SONIC_RSC]; /* seq_no */
798 size = sizeof(uint16_t) * 5 * width;
799 address_space_rw(&s->as, dp8393x_crda(s),
800 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 1);
801
802 /* Move to next descriptor */
803 size = sizeof(uint16_t) * width;
804 address_space_rw(&s->as, dp8393x_crda(s) + sizeof(uint16_t) * 5 * width,
805 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
806 s->regs[SONIC_LLFA] = data[0 * width];
807 if (s->regs[SONIC_LLFA] & 0x1) {
808 /* EOL detected */
809 s->regs[SONIC_ISR] |= SONIC_ISR_RDE;
810 } else {
811 data[0 * width] = 0; /* in_use */
812 address_space_rw(&s->as, dp8393x_crda(s) + sizeof(uint16_t) * 6 * width,
813 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, sizeof(uint16_t), 1);
814 s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
815 s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX;
816 s->regs[SONIC_RSC] = (s->regs[SONIC_RSC] & 0xff00) | (((s->regs[SONIC_RSC] & 0x00ff) + 1) & 0x00ff);
817
818 if (s->regs[SONIC_RCR] & SONIC_RCR_LPKT) {
819 /* Read next RRA */
820 dp8393x_do_read_rra(s);
821 }
822 }
823
824 /* Done */
825 dp8393x_update_irq(s);
826
827 return size;
828 }
829
830 static void dp8393x_reset(DeviceState *dev)
831 {
832 dp8393xState *s = DP8393X(dev);
833 timer_del(s->watchdog);
834
835 memset(s->regs, 0, sizeof(s->regs));
836 s->regs[SONIC_CR] = SONIC_CR_RST | SONIC_CR_STP | SONIC_CR_RXDIS;
837 s->regs[SONIC_DCR] &= ~(SONIC_DCR_EXBUS | SONIC_DCR_LBR);
838 s->regs[SONIC_RCR] &= ~(SONIC_RCR_LB0 | SONIC_RCR_LB1 | SONIC_RCR_BRD | SONIC_RCR_RNT);
839 s->regs[SONIC_TCR] |= SONIC_TCR_NCRS | SONIC_TCR_PTX;
840 s->regs[SONIC_TCR] &= ~SONIC_TCR_BCM;
841 s->regs[SONIC_IMR] = 0;
842 s->regs[SONIC_ISR] = 0;
843 s->regs[SONIC_DCR2] = 0;
844 s->regs[SONIC_EOBC] = 0x02F8;
845 s->regs[SONIC_RSC] = 0;
846 s->regs[SONIC_CE] = 0;
847 s->regs[SONIC_RSC] = 0;
848
849 /* Network cable is connected */
850 s->regs[SONIC_RCR] |= SONIC_RCR_CRS;
851
852 dp8393x_update_irq(s);
853 }
854
855 static NetClientInfo net_dp83932_info = {
856 .type = NET_CLIENT_DRIVER_NIC,
857 .size = sizeof(NICState),
858 .can_receive = dp8393x_can_receive,
859 .receive = dp8393x_receive,
860 };
861
862 static void dp8393x_instance_init(Object *obj)
863 {
864 SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
865 dp8393xState *s = DP8393X(obj);
866
867 sysbus_init_mmio(sbd, &s->mmio);
868 sysbus_init_mmio(sbd, &s->prom);
869 sysbus_init_irq(sbd, &s->irq);
870 }
871
872 static void dp8393x_realize(DeviceState *dev, Error **errp)
873 {
874 dp8393xState *s = DP8393X(dev);
875 int i, checksum;
876 uint8_t *prom;
877 Error *local_err = NULL;
878
879 address_space_init(&s->as, s->dma_mr, "dp8393x");
880 memory_region_init_io(&s->mmio, OBJECT(dev), &dp8393x_ops, s,
881 "dp8393x-regs", 0x40 << s->it_shift);
882
883 s->nic = qemu_new_nic(&net_dp83932_info, &s->conf,
884 object_get_typename(OBJECT(dev)), dev->id, s);
885 qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
886
887 s->watchdog = timer_new_ns(QEMU_CLOCK_VIRTUAL, dp8393x_watchdog, s);
888 s->regs[SONIC_SR] = 0x0004; /* only revision recognized by Linux */
889
890 memory_region_init_ram(&s->prom, OBJECT(dev),
891 "dp8393x-prom", SONIC_PROM_SIZE, &local_err);
892 if (local_err) {
893 error_propagate(errp, local_err);
894 return;
895 }
896 memory_region_set_readonly(&s->prom, true);
897 prom = memory_region_get_ram_ptr(&s->prom);
898 checksum = 0;
899 for (i = 0; i < 6; i++) {
900 prom[i] = s->conf.macaddr.a[i];
901 checksum += prom[i];
902 if (checksum > 0xff) {
903 checksum = (checksum + 1) & 0xff;
904 }
905 }
906 prom[7] = 0xff - checksum;
907 }
908
909 static const VMStateDescription vmstate_dp8393x = {
910 .name = "dp8393x",
911 .version_id = 0,
912 .minimum_version_id = 0,
913 .fields = (VMStateField []) {
914 VMSTATE_BUFFER_UNSAFE(cam, dp8393xState, 0, 16 * 6),
915 VMSTATE_UINT16_ARRAY(regs, dp8393xState, 0x40),
916 VMSTATE_END_OF_LIST()
917 }
918 };
919
920 static Property dp8393x_properties[] = {
921 DEFINE_NIC_PROPERTIES(dp8393xState, conf),
922 DEFINE_PROP_PTR("dma_mr", dp8393xState, dma_mr),
923 DEFINE_PROP_UINT8("it_shift", dp8393xState, it_shift, 0),
924 DEFINE_PROP_END_OF_LIST(),
925 };
926
927 static void dp8393x_class_init(ObjectClass *klass, void *data)
928 {
929 DeviceClass *dc = DEVICE_CLASS(klass);
930
931 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
932 dc->realize = dp8393x_realize;
933 dc->reset = dp8393x_reset;
934 dc->vmsd = &vmstate_dp8393x;
935 dc->props = dp8393x_properties;
936 /* Reason: dma_mr property can't be set */
937 dc->cannot_instantiate_with_device_add_yet = true;
938 }
939
940 static const TypeInfo dp8393x_info = {
941 .name = TYPE_DP8393X,
942 .parent = TYPE_SYS_BUS_DEVICE,
943 .instance_size = sizeof(dp8393xState),
944 .instance_init = dp8393x_instance_init,
945 .class_init = dp8393x_class_init,
946 };
947
948 static void dp8393x_register_types(void)
949 {
950 type_register_static(&dp8393x_info);
951 }
952
953 type_init(dp8393x_register_types)