summaryrefslogtreecommitdiffstats
path: root/hw/mcf_fec.c
blob: 1ed193c5dbb3d875e65cc30edcc3ec22757b8a62 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
/*
 * ColdFire Fast Ethernet Controller emulation.
 *
 * Copyright (c) 2007 CodeSourcery.
 *
 * This code is licensed under the GPL
 */
#include "hw.h"
#include "net.h"
#include "mcf.h"
/* For crc32 */
#include <zlib.h>
#include "exec-memory.h"

//#define DEBUG_FEC 1

#ifdef DEBUG_FEC
#define DPRINTF(fmt, ...) \
do { printf("mcf_fec: " fmt , ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) do {} while(0)
#endif

#define FEC_MAX_FRAME_SIZE 2032

typedef struct {
    MemoryRegion *sysmem;
    MemoryRegion iomem;
    qemu_irq *irq;
    NICState *nic;
    NICConf conf;
    uint32_t irq_state;
    uint32_t eir;
    uint32_t eimr;
    int rx_enabled;
    uint32_t rx_descriptor;
    uint32_t tx_descriptor;
    uint32_t ecr;
    uint32_t mmfr;
    uint32_t mscr;
    uint32_t rcr;
    uint32_t tcr;
    uint32_t tfwr;
    uint32_t rfsr;
    uint32_t erdsr;
    uint32_t etdsr;
    uint32_t emrbr;
} mcf_fec_state;

#define FEC_INT_HB   0x80000000
#define FEC_INT_BABR 0x40000000
#define FEC_INT_BABT 0x20000000
#define FEC_INT_GRA  0x10000000
#define FEC_INT_TXF  0x08000000
#define FEC_INT_TXB  0x04000000
#define FEC_INT_RXF  0x02000000
#define FEC_INT_RXB  0x01000000
#define FEC_INT_MII  0x00800000
#define FEC_INT_EB   0x00400000
#define FEC_INT_LC   0x00200000
#define FEC_INT_RL   0x00100000
#define FEC_INT_UN   0x00080000

#define FEC_EN      2
#define FEC_RESET   1

/* Map interrupt flags onto IRQ lines.  */
#define FEC_NUM_IRQ 13
static const uint32_t mcf_fec_irq_map[FEC_NUM_IRQ] = {
    FEC_INT_TXF,
    FEC_INT_TXB,
    FEC_INT_UN,
    FEC_INT_RL,
    FEC_INT_RXF,
    FEC_INT_RXB,
    FEC_INT_MII,
    FEC_INT_LC,
    FEC_INT_HB,
    FEC_INT_GRA,
    FEC_INT_EB,
    FEC_INT_BABT,
    FEC_INT_BABR
};

/* Buffer Descriptor.  */
typedef struct {
    uint16_t flags;
    uint16_t length;
    uint32_t data;
} mcf_fec_bd;

#define FEC_BD_R    0x8000
#define FEC_BD_E    0x8000
#define FEC_BD_O1   0x4000
#define FEC_BD_W    0x2000
#define FEC_BD_O2   0x1000
#define FEC_BD_L    0x0800
#define FEC_BD_TC   0x0400
#define FEC_BD_ABC  0x0200
#define FEC_BD_M    0x0100
#define FEC_BD_BC   0x0080
#define FEC_BD_MC   0x0040
#define FEC_BD_LG   0x0020
#define FEC_BD_NO   0x0010
#define FEC_BD_CR   0x0004
#define FEC_BD_OV   0x0002
#define FEC_BD_TR   0x0001

static void mcf_fec_read_bd(mcf_fec_bd *bd, uint32_t addr)
{
    cpu_physical_memory_read(addr, (uint8_t *)bd, sizeof(*bd));
    be16_to_cpus(&bd->flags);
    be16_to_cpus(&bd->length);
    be32_to_cpus(&bd->data);
}

static void mcf_fec_write_bd(mcf_fec_bd *bd, uint32_t addr)
{
    mcf_fec_bd tmp;
    tmp.flags = cpu_to_be16(bd->flags);
    tmp.length = cpu_to_be16(bd->length);
    tmp.data = cpu_to_be32(bd->data);
    cpu_physical_memory_write(addr, (uint8_t *)&tmp, sizeof(tmp));
}

static void mcf_fec_update(mcf_fec_state *s)
{
    uint32_t active;
    uint32_t changed;
    uint32_t mask;
    int i;

    active = s->eir & s->eimr;
    changed = active ^s->irq_state;
    for (i = 0; i < FEC_NUM_IRQ; i++) {
        mask = mcf_fec_irq_map[i];
        if (changed & mask) {
            DPRINTF("IRQ %d = %d\n", i, (active & mask) != 0);
            qemu_set_irq(s->irq[i], (active & mask) != 0);
        }
    }
    s->irq_state = active;
}

static void mcf_fec_do_tx(mcf_fec_state *s)
{
    uint32_t addr;
    mcf_fec_bd bd;
    int frame_size;
    int len;
    uint8_t frame[FEC_MAX_FRAME_SIZE];
    uint8_t *ptr;

    DPRINTF("do_tx\n");
    ptr = frame;
    frame_size = 0;
    addr = s->tx_descriptor;
    while (1) {
        mcf_fec_read_bd(&bd, addr);
        DPRINTF("tx_bd %x flags %04x len %d data %08x\n",
                addr, bd.flags, bd.length, bd.data);
        if ((bd.flags & FEC_BD_R) == 0) {
            /* Run out of descriptors to transmit.  */
            break;
        }
        len = bd.length;
        if (frame_size + len > FEC_MAX_FRAME_SIZE) {
            len = FEC_MAX_FRAME_SIZE - frame_size;
            s->eir |= FEC_INT_BABT;
        }
        cpu_physical_memory_read(bd.data, ptr, len);
        ptr += len;
        frame_size += len;
        if (bd.flags & FEC_BD_L) {
            /* Last buffer in frame.  */
            DPRINTF("Sending packet\n");
            qemu_send_packet(&s->nic->nc, frame, len);
            ptr = frame;
            frame_size = 0;
            s->eir |= FEC_INT_TXF;
        }
        s->eir |= FEC_INT_TXB;
        bd.flags &= ~FEC_BD_R;
        /* Write back the modified descriptor.  */
        mcf_fec_write_bd(&bd, addr);
        /* Advance to the next descriptor.  */
        if ((bd.flags & FEC_BD_W) != 0) {
            addr = s->etdsr;
        } else {
            addr += 8;
        }
    }
    s->tx_descriptor = addr;
}

static void mcf_fec_enable_rx(mcf_fec_state *s)
{
    mcf_fec_bd bd;

    mcf_fec_read_bd(&bd, s->rx_descriptor);
    s->rx_enabled = ((bd.flags & FEC_BD_E) != 0);
    if (!s->rx_enabled)
        DPRINTF("RX buffer full\n");
}

static void mcf_fec_reset(mcf_fec_state *s)
{
    s->eir = 0;
    s->eimr = 0;
    s->rx_enabled = 0;
    s->ecr = 0;
    s->mscr = 0;
    s->rcr = 0x05ee0001;
    s->tcr = 0;
    s->tfwr = 0;
    s->rfsr = 0x500;
}

static uint64_t mcf_fec_read(void *opaque, hwaddr addr,
                             unsigned size)
{
    mcf_fec_state *s = (mcf_fec_state *)opaque;
    switch (addr & 0x3ff) {
    case 0x004: return s->eir;
    case 0x008: return s->eimr;
    case 0x010: return s->rx_enabled ? (1 << 24) : 0; /* RDAR */
    case 0x014: return 0; /* TDAR */
    case 0x024: return s->ecr;
    case 0x040: return s->mmfr;
    case 0x044: return s->mscr;
    case 0x064: return 0; /* MIBC */
    case 0x084: return s->rcr;
    case 0x0c4: return s->tcr;
    case 0x0e4: /* PALR */
        return (s->conf.macaddr.a[0] << 24) | (s->conf.macaddr.a[1] << 16)
              | (s->conf.macaddr.a[2] << 8) | s->conf.macaddr.a[3];
        break;
    case 0x0e8: /* PAUR */
        return (s->conf.macaddr.a[4] << 24) | (s->conf.macaddr.a[5] << 16) | 0x8808;
    case 0x0ec: return 0x10000; /* OPD */
    case 0x118: return 0;
    case 0x11c: return 0;
    case 0x120: return 0;
    case 0x124: return 0;
    case 0x144: return s->tfwr;
    case 0x14c: return 0x600;
    case 0x150: return s->rfsr;
    case 0x180: return s->erdsr;
    case 0x184: return s->etdsr;
    case 0x188: return s->emrbr;
    default:
        hw_error("mcf_fec_read: Bad address 0x%x\n", (int)addr);
        return 0;
    }
}

static void mcf_fec_write(void *opaque, hwaddr addr,
                          uint64_t value, unsigned size)
{
    mcf_fec_state *s = (mcf_fec_state *)opaque;
    switch (addr & 0x3ff) {
    case 0x004:
        s->eir &= ~value;
        break;
    case 0x008:
        s->eimr = value;
        break;
    case 0x010: /* RDAR */
        if ((s->ecr & FEC_EN) && !s->rx_enabled) {
            DPRINTF("RX enable\n");
            mcf_fec_enable_rx(s);
        }
        break;
    case 0x014: /* TDAR */
        if (s->ecr & FEC_EN) {
            mcf_fec_do_tx(s);
        }
        break;
    case 0x024:
        s->ecr = value;
        if (value & FEC_RESET) {
            DPRINTF("Reset\n");
            mcf_fec_reset(s);
        }
        if ((s->ecr & FEC_EN) == 0) {
            s->rx_enabled = 0;
        }
        break;
    case 0x040:
        /* TODO: Implement MII.  */
        s->mmfr = value;
        break;
    case 0x044:
        s->mscr = value & 0xfe;
        break;
    case 0x064:
        /* TODO: Implement MIB.  */
        break;
    case 0x084:
        s->rcr = value & 0x07ff003f;
        /* TODO: Implement LOOP mode.  */
        break;
    case 0x0c4: /* TCR */
        /* We transmit immediately, so raise GRA immediately.  */
        s->tcr = value;
        if (value & 1)
            s->eir |= FEC_INT_GRA;
        break;
    case 0x0e4: /* PALR */
        s->conf.macaddr.a[0] = value >> 24;
        s->conf.macaddr.a[1] = value >> 16;
        s->conf.macaddr.a[2] = value >> 8;
        s->conf.macaddr.a[3] = value;
        break;
    case 0x0e8: /* PAUR */
        s->conf.macaddr.a[4] = value >> 24;
        s->conf.macaddr.a[5] = value >> 16;
        break;
    case 0x0ec:
        /* OPD */
        break;
    case 0x118:
    case 0x11c:
    case 0x120:
    case 0x124:
        /* TODO: implement MAC hash filtering.  */
        break;
    case 0x144:
        s->tfwr = value & 3;
        break;
    case 0x14c:
        /* FRBR writes ignored.  */
        break;
    case 0x150:
        s->rfsr = (value & 0x3fc) | 0x400;
        break;
    case 0x180:
        s->erdsr = value & ~3;
        s->rx_descriptor = s->erdsr;
        break;
    case 0x184:
        s->etdsr = value & ~3;
        s->tx_descriptor = s->etdsr;
        break;
    case 0x188:
        s->emrbr = value & 0x7f0;
        break;
    default:
        hw_error("mcf_fec_write Bad address 0x%x\n", (int)addr);
    }
    mcf_fec_update(s);
}

static int mcf_fec_can_receive(NetClientState *nc)
{
    mcf_fec_state *s = DO_UPCAST(NICState, nc, nc)->opaque;
    return s->rx_enabled;
}

static ssize_t mcf_fec_receive(NetClientState *nc, const uint8_t *buf, size_t size)
{
    mcf_fec_state *s = DO_UPCAST(NICState, nc, nc)->opaque;
    mcf_fec_bd bd;
    uint32_t flags = 0;
    uint32_t addr;
    uint32_t crc;
    uint32_t buf_addr;
    uint8_t *crc_ptr;
    unsigned int buf_len;

    DPRINTF("do_rx len %d\n", size);
    if (!s->rx_enabled) {
        fprintf(stderr, "mcf_fec_receive: Unexpected packet\n");
    }
    /* 4 bytes for the CRC.  */
    size += 4;
    crc = cpu_to_be32(crc32(~0, buf, size));
    crc_ptr = (uint8_t *)&crc;
    /* Huge frames are truncted.  */
    if (size > FEC_MAX_FRAME_SIZE) {
        size = FEC_MAX_FRAME_SIZE;
        flags |= FEC_BD_TR | FEC_BD_LG;
    }
    /* Frames larger than the user limit just set error flags.  */
    if (size > (s->rcr >> 16)) {
        flags |= FEC_BD_LG;
    }
    addr = s->rx_descriptor;
    while (size > 0) {
        mcf_fec_read_bd(&bd, addr);
        if ((bd.flags & FEC_BD_E) == 0) {
            /* No descriptors available.  Bail out.  */
            /* FIXME: This is wrong.  We should probably either save the
               remainder for when more RX buffers are available, or
               flag an error.  */
            fprintf(stderr, "mcf_fec: Lost end of frame\n");
            break;
        }
        buf_len = (size <= s->emrbr) ? size: s->emrbr;
        bd.length = buf_len;
        size -= buf_len;
        DPRINTF("rx_bd %x length %d\n", addr, bd.length);
        /* The last 4 bytes are the CRC.  */
        if (size < 4)
            buf_len += size - 4;
        buf_addr = bd.data;
        cpu_physical_memory_write(buf_addr, buf, buf_len);
        buf += buf_len;
        if (size < 4) {
            cpu_physical_memory_write(buf_addr + buf_len, crc_ptr, 4 - size);
            crc_ptr += 4 - size;
        }
        bd.flags &= ~FEC_BD_E;
        if (size == 0) {
            /* Last buffer in frame.  */
            bd.flags |= flags | FEC_BD_L;
            DPRINTF("rx frame flags %04x\n", bd.flags);
            s->eir |= FEC_INT_RXF;
        } else {
            s->eir |= FEC_INT_RXB;
        }
        mcf_fec_write_bd(&bd, addr);
        /* Advance to the next descriptor.  */
        if ((bd.flags & FEC_BD_W) != 0) {
            addr = s->erdsr;
        } else {
            addr += 8;
        }
    }
    s->rx_descriptor = addr;
    mcf_fec_enable_rx(s);
    mcf_fec_update(s);
    return size;
}

static const MemoryRegionOps mcf_fec_ops = {
    .read = mcf_fec_read,
    .write = mcf_fec_write,
    .endianness = DEVICE_NATIVE_ENDIAN,
};

static void mcf_fec_cleanup(NetClientState *nc)
{
    mcf_fec_state *s = DO_UPCAST(NICState, nc, nc)->opaque;

    memory_region_del_subregion(s->sysmem, &s->iomem);
    memory_region_destroy(&s->iomem);

    g_free(s);
}

static NetClientInfo net_mcf_fec_info = {
    .type = NET_CLIENT_OPTIONS_KIND_NIC,
    .size = sizeof(NICState),
    .can_receive = mcf_fec_can_receive,
    .receive = mcf_fec_receive,
    .cleanup = mcf_fec_cleanup,
};

void mcf_fec_init(MemoryRegion *sysmem, NICInfo *nd,
                  hwaddr base, qemu_irq *irq)
{
    mcf_fec_state *s;

    qemu_check_nic_model(nd, "mcf_fec");

    s = (mcf_fec_state *)g_malloc0(sizeof(mcf_fec_state));
    s->sysmem = sysmem;
    s->irq = irq;

    memory_region_init_io(&s->iomem, &mcf_fec_ops, s, "fec", 0x400);
    memory_region_add_subregion(sysmem, base, &s->iomem);

    s->conf.macaddr = nd->macaddr;
    s->conf.peer = nd->netdev;

    s->nic = qemu_new_nic(&net_mcf_fec_info, &s->conf, nd->model, nd->name, s);

    qemu_format_nic_info_str(&s->nic->nc, s->conf.macaddr.a);
}
OpenPOWER on IntegriCloud