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1.1 root 1: /*
2: * ColdFire Fast Ethernet Controller emulation.
3: *
4: * Copyright (c) 2007 CodeSourcery.
5: *
6: * This code is licenced under the GPL
7: */
8: #include "hw.h"
9: #include "net.h"
10: #include "mcf.h"
11: /* For crc32 */
12: #include <zlib.h>
13:
14: //#define DEBUG_FEC 1
15:
16: #ifdef DEBUG_FEC
1.1.1.4 ! root 17: #define DPRINTF(fmt, ...) \
! 18: do { printf("mcf_fec: " fmt , ## __VA_ARGS__); } while (0)
1.1 root 19: #else
1.1.1.4 ! root 20: #define DPRINTF(fmt, ...) do {} while(0)
1.1 root 21: #endif
22:
23: #define FEC_MAX_FRAME_SIZE 2032
24:
25: typedef struct {
26: qemu_irq *irq;
1.1.1.3 root 27: int mmio_index;
1.1 root 28: VLANClientState *vc;
29: uint32_t irq_state;
30: uint32_t eir;
31: uint32_t eimr;
32: int rx_enabled;
33: uint32_t rx_descriptor;
34: uint32_t tx_descriptor;
35: uint32_t ecr;
36: uint32_t mmfr;
37: uint32_t mscr;
38: uint32_t rcr;
39: uint32_t tcr;
40: uint32_t tfwr;
41: uint32_t rfsr;
42: uint32_t erdsr;
43: uint32_t etdsr;
44: uint32_t emrbr;
45: uint8_t macaddr[6];
46: } mcf_fec_state;
47:
48: #define FEC_INT_HB 0x80000000
49: #define FEC_INT_BABR 0x40000000
50: #define FEC_INT_BABT 0x20000000
51: #define FEC_INT_GRA 0x10000000
52: #define FEC_INT_TXF 0x08000000
53: #define FEC_INT_TXB 0x04000000
54: #define FEC_INT_RXF 0x02000000
55: #define FEC_INT_RXB 0x01000000
56: #define FEC_INT_MII 0x00800000
57: #define FEC_INT_EB 0x00400000
58: #define FEC_INT_LC 0x00200000
59: #define FEC_INT_RL 0x00100000
60: #define FEC_INT_UN 0x00080000
61:
62: #define FEC_EN 2
63: #define FEC_RESET 1
64:
65: /* Map interrupt flags onto IRQ lines. */
66: #define FEC_NUM_IRQ 13
67: static const uint32_t mcf_fec_irq_map[FEC_NUM_IRQ] = {
68: FEC_INT_TXF,
69: FEC_INT_TXB,
70: FEC_INT_UN,
71: FEC_INT_RL,
72: FEC_INT_RXF,
73: FEC_INT_RXB,
74: FEC_INT_MII,
75: FEC_INT_LC,
76: FEC_INT_HB,
77: FEC_INT_GRA,
78: FEC_INT_EB,
79: FEC_INT_BABT,
80: FEC_INT_BABR
81: };
82:
83: /* Buffer Descriptor. */
84: typedef struct {
85: uint16_t flags;
86: uint16_t length;
87: uint32_t data;
88: } mcf_fec_bd;
89:
90: #define FEC_BD_R 0x8000
91: #define FEC_BD_E 0x8000
92: #define FEC_BD_O1 0x4000
93: #define FEC_BD_W 0x2000
94: #define FEC_BD_O2 0x1000
95: #define FEC_BD_L 0x0800
96: #define FEC_BD_TC 0x0400
97: #define FEC_BD_ABC 0x0200
98: #define FEC_BD_M 0x0100
99: #define FEC_BD_BC 0x0080
100: #define FEC_BD_MC 0x0040
101: #define FEC_BD_LG 0x0020
102: #define FEC_BD_NO 0x0010
103: #define FEC_BD_CR 0x0004
104: #define FEC_BD_OV 0x0002
105: #define FEC_BD_TR 0x0001
106:
107: static void mcf_fec_read_bd(mcf_fec_bd *bd, uint32_t addr)
108: {
109: cpu_physical_memory_read(addr, (uint8_t *)bd, sizeof(*bd));
110: be16_to_cpus(&bd->flags);
111: be16_to_cpus(&bd->length);
112: be32_to_cpus(&bd->data);
113: }
114:
115: static void mcf_fec_write_bd(mcf_fec_bd *bd, uint32_t addr)
116: {
117: mcf_fec_bd tmp;
118: tmp.flags = cpu_to_be16(bd->flags);
119: tmp.length = cpu_to_be16(bd->length);
120: tmp.data = cpu_to_be32(bd->data);
121: cpu_physical_memory_write(addr, (uint8_t *)&tmp, sizeof(tmp));
122: }
123:
124: static void mcf_fec_update(mcf_fec_state *s)
125: {
126: uint32_t active;
127: uint32_t changed;
128: uint32_t mask;
129: int i;
130:
131: active = s->eir & s->eimr;
132: changed = active ^s->irq_state;
133: for (i = 0; i < FEC_NUM_IRQ; i++) {
134: mask = mcf_fec_irq_map[i];
135: if (changed & mask) {
136: DPRINTF("IRQ %d = %d\n", i, (active & mask) != 0);
137: qemu_set_irq(s->irq[i], (active & mask) != 0);
138: }
139: }
140: s->irq_state = active;
141: }
142:
143: static void mcf_fec_do_tx(mcf_fec_state *s)
144: {
145: uint32_t addr;
146: mcf_fec_bd bd;
147: int frame_size;
148: int len;
149: uint8_t frame[FEC_MAX_FRAME_SIZE];
150: uint8_t *ptr;
151:
152: DPRINTF("do_tx\n");
153: ptr = frame;
154: frame_size = 0;
155: addr = s->tx_descriptor;
156: while (1) {
157: mcf_fec_read_bd(&bd, addr);
158: DPRINTF("tx_bd %x flags %04x len %d data %08x\n",
159: addr, bd.flags, bd.length, bd.data);
160: if ((bd.flags & FEC_BD_R) == 0) {
161: /* Run out of descriptors to transmit. */
162: break;
163: }
164: len = bd.length;
165: if (frame_size + len > FEC_MAX_FRAME_SIZE) {
166: len = FEC_MAX_FRAME_SIZE - frame_size;
167: s->eir |= FEC_INT_BABT;
168: }
169: cpu_physical_memory_read(bd.data, ptr, len);
170: ptr += len;
171: frame_size += len;
172: if (bd.flags & FEC_BD_L) {
173: /* Last buffer in frame. */
174: DPRINTF("Sending packet\n");
175: qemu_send_packet(s->vc, frame, len);
176: ptr = frame;
177: frame_size = 0;
178: s->eir |= FEC_INT_TXF;
179: }
180: s->eir |= FEC_INT_TXB;
181: bd.flags &= ~FEC_BD_R;
182: /* Write back the modified descriptor. */
183: mcf_fec_write_bd(&bd, addr);
184: /* Advance to the next descriptor. */
185: if ((bd.flags & FEC_BD_W) != 0) {
186: addr = s->etdsr;
187: } else {
188: addr += 8;
189: }
190: }
191: s->tx_descriptor = addr;
192: }
193:
194: static void mcf_fec_enable_rx(mcf_fec_state *s)
195: {
196: mcf_fec_bd bd;
197:
198: mcf_fec_read_bd(&bd, s->rx_descriptor);
199: s->rx_enabled = ((bd.flags & FEC_BD_E) != 0);
200: if (!s->rx_enabled)
201: DPRINTF("RX buffer full\n");
202: }
203:
204: static void mcf_fec_reset(mcf_fec_state *s)
205: {
206: s->eir = 0;
207: s->eimr = 0;
208: s->rx_enabled = 0;
209: s->ecr = 0;
210: s->mscr = 0;
211: s->rcr = 0x05ee0001;
212: s->tcr = 0;
213: s->tfwr = 0;
214: s->rfsr = 0x500;
215: }
216:
217: static uint32_t mcf_fec_read(void *opaque, target_phys_addr_t addr)
218: {
219: mcf_fec_state *s = (mcf_fec_state *)opaque;
220: switch (addr & 0x3ff) {
221: case 0x004: return s->eir;
222: case 0x008: return s->eimr;
223: case 0x010: return s->rx_enabled ? (1 << 24) : 0; /* RDAR */
224: case 0x014: return 0; /* TDAR */
225: case 0x024: return s->ecr;
226: case 0x040: return s->mmfr;
227: case 0x044: return s->mscr;
228: case 0x064: return 0; /* MIBC */
229: case 0x084: return s->rcr;
230: case 0x0c4: return s->tcr;
231: case 0x0e4: /* PALR */
232: return (s->macaddr[0] << 24) | (s->macaddr[1] << 16)
233: | (s->macaddr[2] << 8) | s->macaddr[3];
234: break;
235: case 0x0e8: /* PAUR */
236: return (s->macaddr[4] << 24) | (s->macaddr[5] << 16) | 0x8808;
237: case 0x0ec: return 0x10000; /* OPD */
238: case 0x118: return 0;
239: case 0x11c: return 0;
240: case 0x120: return 0;
241: case 0x124: return 0;
242: case 0x144: return s->tfwr;
243: case 0x14c: return 0x600;
244: case 0x150: return s->rfsr;
245: case 0x180: return s->erdsr;
246: case 0x184: return s->etdsr;
247: case 0x188: return s->emrbr;
248: default:
1.1.1.4 ! root 249: hw_error("mcf_fec_read: Bad address 0x%x\n", (int)addr);
1.1 root 250: return 0;
251: }
252: }
253:
254: static 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: /* RDAR */
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: /* TDAR */
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: /* TODO: Implement MII. */
287: s->mmfr = value;
288: break;
289: case 0x044:
290: s->mscr = value & 0xfe;
291: break;
292: case 0x064:
293: /* TODO: Implement MIB. */
294: break;
295: case 0x084:
296: s->rcr = value & 0x07ff003f;
297: /* TODO: Implement LOOP mode. */
298: break;
299: case 0x0c4: /* TCR */
300: /* We transmit immediately, so raise GRA immediately. */
301: s->tcr = value;
302: if (value & 1)
303: s->eir |= FEC_INT_GRA;
304: break;
305: case 0x0e4: /* PALR */
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: /* PAUR */
312: s->macaddr[4] = value >> 24;
313: s->macaddr[5] = value >> 16;
314: break;
315: case 0x0ec:
316: /* OPD */
317: break;
318: case 0x118:
319: case 0x11c:
320: case 0x120:
321: case 0x124:
322: /* TODO: implement MAC hash filtering. */
323: break;
324: case 0x144:
325: s->tfwr = value & 3;
326: break;
327: case 0x14c:
328: /* FRBR writes ignored. */
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:
1.1.1.4 ! root 345: hw_error("mcf_fec_write Bad address 0x%x\n", (int)addr);
1.1 root 346: }
347: mcf_fec_update(s);
348: }
349:
1.1.1.4 ! root 350: static int mcf_fec_can_receive(VLANClientState *vc)
1.1 root 351: {
1.1.1.4 ! root 352: mcf_fec_state *s = vc->opaque;
1.1 root 353: return s->rx_enabled;
354: }
355:
1.1.1.4 ! root 356: static ssize_t mcf_fec_receive(VLANClientState *vc, const uint8_t *buf, size_t size)
1.1 root 357: {
1.1.1.4 ! root 358: mcf_fec_state *s = vc->opaque;
1.1 root 359: mcf_fec_bd bd;
360: uint32_t flags = 0;
361: uint32_t addr;
362: uint32_t crc;
363: uint32_t buf_addr;
364: uint8_t *crc_ptr;
365: unsigned int buf_len;
366:
367: DPRINTF("do_rx len %d\n", size);
368: if (!s->rx_enabled) {
369: fprintf(stderr, "mcf_fec_receive: Unexpected packet\n");
370: }
371: /* 4 bytes for the CRC. */
372: size += 4;
373: crc = cpu_to_be32(crc32(~0, buf, size));
374: crc_ptr = (uint8_t *)&crc;
375: /* Huge frames are truncted. */
376: if (size > FEC_MAX_FRAME_SIZE) {
377: size = FEC_MAX_FRAME_SIZE;
378: flags |= FEC_BD_TR | FEC_BD_LG;
379: }
380: /* Frames larger than the user limit just set error flags. */
381: if (size > (s->rcr >> 16)) {
382: flags |= FEC_BD_LG;
383: }
384: addr = s->rx_descriptor;
385: while (size > 0) {
386: mcf_fec_read_bd(&bd, addr);
387: if ((bd.flags & FEC_BD_E) == 0) {
388: /* No descriptors available. Bail out. */
389: /* FIXME: This is wrong. We should probably either save the
390: remainder for when more RX buffers are available, or
391: flag an error. */
392: fprintf(stderr, "mcf_fec: Lost end of frame\n");
393: break;
394: }
395: buf_len = (size <= s->emrbr) ? size: s->emrbr;
396: bd.length = buf_len;
397: size -= buf_len;
398: DPRINTF("rx_bd %x length %d\n", addr, bd.length);
399: /* The last 4 bytes are the CRC. */
400: if (size < 4)
401: buf_len += size - 4;
402: buf_addr = bd.data;
403: cpu_physical_memory_write(buf_addr, buf, buf_len);
404: buf += buf_len;
405: if (size < 4) {
406: cpu_physical_memory_write(buf_addr + buf_len, crc_ptr, 4 - size);
407: crc_ptr += 4 - size;
408: }
409: bd.flags &= ~FEC_BD_E;
410: if (size == 0) {
411: /* Last buffer in frame. */
412: bd.flags |= flags | FEC_BD_L;
413: DPRINTF("rx frame flags %04x\n", bd.flags);
414: s->eir |= FEC_INT_RXF;
415: } else {
416: s->eir |= FEC_INT_RXB;
417: }
418: mcf_fec_write_bd(&bd, addr);
419: /* Advance to the next descriptor. */
420: if ((bd.flags & FEC_BD_W) != 0) {
421: addr = s->erdsr;
422: } else {
423: addr += 8;
424: }
425: }
426: s->rx_descriptor = addr;
427: mcf_fec_enable_rx(s);
428: mcf_fec_update(s);
1.1.1.4 ! root 429: return size;
1.1 root 430: }
431:
432: static CPUReadMemoryFunc *mcf_fec_readfn[] = {
433: mcf_fec_read,
434: mcf_fec_read,
435: mcf_fec_read
436: };
437:
438: static CPUWriteMemoryFunc *mcf_fec_writefn[] = {
439: mcf_fec_write,
440: mcf_fec_write,
441: mcf_fec_write
442: };
443:
1.1.1.3 root 444: static void mcf_fec_cleanup(VLANClientState *vc)
445: {
446: mcf_fec_state *s = vc->opaque;
447:
448: cpu_unregister_io_memory(s->mmio_index);
449:
450: qemu_free(s);
451: }
452:
1.1 root 453: void mcf_fec_init(NICInfo *nd, target_phys_addr_t base, qemu_irq *irq)
454: {
455: mcf_fec_state *s;
456:
1.1.1.2 root 457: qemu_check_nic_model(nd, "mcf_fec");
458:
1.1 root 459: s = (mcf_fec_state *)qemu_mallocz(sizeof(mcf_fec_state));
460: s->irq = irq;
1.1.1.4 ! root 461: s->mmio_index = cpu_register_io_memory(mcf_fec_readfn,
1.1.1.3 root 462: mcf_fec_writefn, s);
463: cpu_register_physical_memory(base, 0x400, s->mmio_index);
1.1 root 464:
1.1.1.4 ! root 465: s->vc = nd->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
! 466: mcf_fec_can_receive, mcf_fec_receive,
! 467: NULL, mcf_fec_cleanup, s);
1.1 root 468: memcpy(s->macaddr, nd->macaddr, 6);
1.1.1.2 root 469: qemu_format_nic_info_str(s->vc, s->macaddr);
1.1 root 470: }
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