summaryrefslogtreecommitdiff
path: root/hw/net/stellaris_enet.c
blob: aac7c76feb6c55a0d338863715117abe627a3bf9 (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
/*
 * Luminary Micro Stellaris Ethernet Controller
 *
 * Copyright (c) 2007 CodeSourcery.
 * Written by Paul Brook
 *
 * This code is licensed under the GPL.
 */
#include "hw/sysbus.h"
#include "net/net.h"
#include <zlib.h>

//#define DEBUG_STELLARIS_ENET 1

#ifdef DEBUG_STELLARIS_ENET
#define DPRINTF(fmt, ...) \
do { printf("stellaris_enet: " fmt , ## __VA_ARGS__); } while (0)
#define BADF(fmt, ...) \
do { fprintf(stderr, "stellaris_enet: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)
#else
#define DPRINTF(fmt, ...) do {} while(0)
#define BADF(fmt, ...) \
do { fprintf(stderr, "stellaris_enet: error: " fmt , ## __VA_ARGS__);} while (0)
#endif

#define SE_INT_RX       0x01
#define SE_INT_TXER     0x02
#define SE_INT_TXEMP    0x04
#define SE_INT_FOV      0x08
#define SE_INT_RXER     0x10
#define SE_INT_MD       0x20
#define SE_INT_PHY      0x40

#define SE_RCTL_RXEN    0x01
#define SE_RCTL_AMUL    0x02
#define SE_RCTL_PRMS    0x04
#define SE_RCTL_BADCRC  0x08
#define SE_RCTL_RSTFIFO 0x10

#define SE_TCTL_TXEN    0x01
#define SE_TCTL_PADEN   0x02
#define SE_TCTL_CRC     0x04
#define SE_TCTL_DUPLEX  0x08

typedef struct {
    SysBusDevice busdev;
    uint32_t ris;
    uint32_t im;
    uint32_t rctl;
    uint32_t tctl;
    uint32_t thr;
    uint32_t mctl;
    uint32_t mdv;
    uint32_t mtxd;
    uint32_t mrxd;
    uint32_t np;
    int tx_frame_len;
    int tx_fifo_len;
    uint8_t tx_fifo[2048];
    /* Real hardware has a 2k fifo, which works out to be at most 31 packets.
       We implement a full 31 packet fifo.  */
    struct {
        uint8_t data[2048];
        int len;
    } rx[31];
    uint8_t *rx_fifo;
    int rx_fifo_len;
    int next_packet;
    NICState *nic;
    NICConf conf;
    qemu_irq irq;
    MemoryRegion mmio;
} stellaris_enet_state;

static void stellaris_enet_update(stellaris_enet_state *s)
{
    qemu_set_irq(s->irq, (s->ris & s->im) != 0);
}

/* TODO: Implement MAC address filtering.  */
static ssize_t stellaris_enet_receive(NetClientState *nc, const uint8_t *buf, size_t size)
{
    stellaris_enet_state *s = qemu_get_nic_opaque(nc);
    int n;
    uint8_t *p;
    uint32_t crc;

    if ((s->rctl & SE_RCTL_RXEN) == 0)
        return -1;
    if (s->np >= 31) {
        DPRINTF("Packet dropped\n");
        return -1;
    }

    DPRINTF("Received packet len=%d\n", size);
    n = s->next_packet + s->np;
    if (n >= 31)
        n -= 31;
    s->np++;

    s->rx[n].len = size + 6;
    p = s->rx[n].data;
    *(p++) = (size + 6);
    *(p++) = (size + 6) >> 8;
    memcpy (p, buf, size);
    p += size;
    crc = crc32(~0, buf, size);
    *(p++) = crc;
    *(p++) = crc >> 8;
    *(p++) = crc >> 16;
    *(p++) = crc >> 24;
    /* Clear the remaining bytes in the last word.  */
    if ((size & 3) != 2) {
        memset(p, 0, (6 - size) & 3);
    }

    s->ris |= SE_INT_RX;
    stellaris_enet_update(s);

    return size;
}

static int stellaris_enet_can_receive(NetClientState *nc)
{
    stellaris_enet_state *s = qemu_get_nic_opaque(nc);

    if ((s->rctl & SE_RCTL_RXEN) == 0)
        return 1;

    return (s->np < 31);
}

static uint64_t stellaris_enet_read(void *opaque, hwaddr offset,
                                    unsigned size)
{
    stellaris_enet_state *s = (stellaris_enet_state *)opaque;
    uint32_t val;

    switch (offset) {
    case 0x00: /* RIS */
        DPRINTF("IRQ status %02x\n", s->ris);
        return s->ris;
    case 0x04: /* IM */
        return s->im;
    case 0x08: /* RCTL */
        return s->rctl;
    case 0x0c: /* TCTL */
        return s->tctl;
    case 0x10: /* DATA */
        if (s->rx_fifo_len == 0) {
            if (s->np == 0) {
                BADF("RX underflow\n");
                return 0;
            }
            s->rx_fifo_len = s->rx[s->next_packet].len;
            s->rx_fifo = s->rx[s->next_packet].data;
            DPRINTF("RX FIFO start packet len=%d\n", s->rx_fifo_len);
        }
        val = s->rx_fifo[0] | (s->rx_fifo[1] << 8) | (s->rx_fifo[2] << 16)
              | (s->rx_fifo[3] << 24);
        s->rx_fifo += 4;
        s->rx_fifo_len -= 4;
        if (s->rx_fifo_len <= 0) {
            s->rx_fifo_len = 0;
            s->next_packet++;
            if (s->next_packet >= 31)
                s->next_packet = 0;
            s->np--;
            DPRINTF("RX done np=%d\n", s->np);
        }
        return val;
    case 0x14: /* IA0 */
        return s->conf.macaddr.a[0] | (s->conf.macaddr.a[1] << 8)
               | (s->conf.macaddr.a[2] << 16) | (s->conf.macaddr.a[3] << 24);
    case 0x18: /* IA1 */
        return s->conf.macaddr.a[4] | (s->conf.macaddr.a[5] << 8);
    case 0x1c: /* THR */
        return s->thr;
    case 0x20: /* MCTL */
        return s->mctl;
    case 0x24: /* MDV */
        return s->mdv;
    case 0x28: /* MADD */
        return 0;
    case 0x2c: /* MTXD */
        return s->mtxd;
    case 0x30: /* MRXD */
        return s->mrxd;
    case 0x34: /* NP */
        return s->np;
    case 0x38: /* TR */
        return 0;
    case 0x3c: /* Undocuented: Timestamp? */
        return 0;
    default:
        hw_error("stellaris_enet_read: Bad offset %x\n", (int)offset);
        return 0;
    }
}

static void stellaris_enet_write(void *opaque, hwaddr offset,
                                 uint64_t value, unsigned size)
{
    stellaris_enet_state *s = (stellaris_enet_state *)opaque;

    switch (offset) {
    case 0x00: /* IACK */
        s->ris &= ~value;
        DPRINTF("IRQ ack %02x/%02x\n", value, s->ris);
        stellaris_enet_update(s);
        /* Clearing TXER also resets the TX fifo.  */
        if (value & SE_INT_TXER)
            s->tx_frame_len = -1;
        break;
    case 0x04: /* IM */
        DPRINTF("IRQ mask %02x/%02x\n", value, s->ris);
        s->im = value;
        stellaris_enet_update(s);
        break;
    case 0x08: /* RCTL */
        s->rctl = value;
        if (value & SE_RCTL_RSTFIFO) {
            s->rx_fifo_len = 0;
            s->np = 0;
            stellaris_enet_update(s);
        }
        break;
    case 0x0c: /* TCTL */
        s->tctl = value;
        break;
    case 0x10: /* DATA */
        if (s->tx_frame_len == -1) {
            s->tx_frame_len = value & 0xffff;
            if (s->tx_frame_len > 2032) {
                DPRINTF("TX frame too long (%d)\n", s->tx_frame_len);
                s->tx_frame_len = 0;
                s->ris |= SE_INT_TXER;
                stellaris_enet_update(s);
            } else {
                DPRINTF("Start TX frame len=%d\n", s->tx_frame_len);
                /* The value written does not include the ethernet header.  */
                s->tx_frame_len += 14;
                if ((s->tctl & SE_TCTL_CRC) == 0)
                    s->tx_frame_len += 4;
                s->tx_fifo_len = 0;
                s->tx_fifo[s->tx_fifo_len++] = value >> 16;
                s->tx_fifo[s->tx_fifo_len++] = value >> 24;
            }
        } else {
            s->tx_fifo[s->tx_fifo_len++] = value;
            s->tx_fifo[s->tx_fifo_len++] = value >> 8;
            s->tx_fifo[s->tx_fifo_len++] = value >> 16;
            s->tx_fifo[s->tx_fifo_len++] = value >> 24;
            if (s->tx_fifo_len >= s->tx_frame_len) {
                /* We don't implement explicit CRC, so just chop it off.  */
                if ((s->tctl & SE_TCTL_CRC) == 0)
                    s->tx_frame_len -= 4;
                if ((s->tctl & SE_TCTL_PADEN) && s->tx_frame_len < 60) {
                    memset(&s->tx_fifo[s->tx_frame_len], 0, 60 - s->tx_frame_len);
                    s->tx_fifo_len = 60;
                }
                qemu_send_packet(qemu_get_queue(s->nic), s->tx_fifo,
                                 s->tx_frame_len);
                s->tx_frame_len = -1;
                s->ris |= SE_INT_TXEMP;
                stellaris_enet_update(s);
                DPRINTF("Done TX\n");
            }
        }
        break;
    case 0x14: /* IA0 */
        s->conf.macaddr.a[0] = value;
        s->conf.macaddr.a[1] = value >> 8;
        s->conf.macaddr.a[2] = value >> 16;
        s->conf.macaddr.a[3] = value >> 24;
        break;
    case 0x18: /* IA1 */
        s->conf.macaddr.a[4] = value;
        s->conf.macaddr.a[5] = value >> 8;
        break;
    case 0x1c: /* THR */
        s->thr = value;
        break;
    case 0x20: /* MCTL */
        s->mctl = value;
        break;
    case 0x24: /* MDV */
        s->mdv = value;
        break;
    case 0x28: /* MADD */
        /* ignored.  */
        break;
    case 0x2c: /* MTXD */
        s->mtxd = value & 0xff;
        break;
    case 0x30: /* MRXD */
    case 0x34: /* NP */
    case 0x38: /* TR */
        /* Ignored.  */
    case 0x3c: /* Undocuented: Timestamp? */
        /* Ignored.  */
        break;
    default:
        hw_error("stellaris_enet_write: Bad offset %x\n", (int)offset);
    }
}

static const MemoryRegionOps stellaris_enet_ops = {
    .read = stellaris_enet_read,
    .write = stellaris_enet_write,
    .endianness = DEVICE_NATIVE_ENDIAN,
};

static void stellaris_enet_reset(stellaris_enet_state *s)
{
    s->mdv = 0x80;
    s->rctl = SE_RCTL_BADCRC;
    s->im = SE_INT_PHY | SE_INT_MD | SE_INT_RXER | SE_INT_FOV | SE_INT_TXEMP
            | SE_INT_TXER | SE_INT_RX;
    s->thr = 0x3f;
    s->tx_frame_len = -1;
}

static void stellaris_enet_save(QEMUFile *f, void *opaque)
{
    stellaris_enet_state *s = (stellaris_enet_state *)opaque;
    int i;

    qemu_put_be32(f, s->ris);
    qemu_put_be32(f, s->im);
    qemu_put_be32(f, s->rctl);
    qemu_put_be32(f, s->tctl);
    qemu_put_be32(f, s->thr);
    qemu_put_be32(f, s->mctl);
    qemu_put_be32(f, s->mdv);
    qemu_put_be32(f, s->mtxd);
    qemu_put_be32(f, s->mrxd);
    qemu_put_be32(f, s->np);
    qemu_put_be32(f, s->tx_frame_len);
    qemu_put_be32(f, s->tx_fifo_len);
    qemu_put_buffer(f, s->tx_fifo, sizeof(s->tx_fifo));
    for (i = 0; i < 31; i++) {
        qemu_put_be32(f, s->rx[i].len);
        qemu_put_buffer(f, s->rx[i].data, sizeof(s->rx[i].data));

    }
    qemu_put_be32(f, s->next_packet);
    qemu_put_be32(f, s->rx_fifo - s->rx[s->next_packet].data);
    qemu_put_be32(f, s->rx_fifo_len);
}

static int stellaris_enet_load(QEMUFile *f, void *opaque, int version_id)
{
    stellaris_enet_state *s = (stellaris_enet_state *)opaque;
    int i;

    if (version_id != 1)
        return -EINVAL;

    s->ris = qemu_get_be32(f);
    s->im = qemu_get_be32(f);
    s->rctl = qemu_get_be32(f);
    s->tctl = qemu_get_be32(f);
    s->thr = qemu_get_be32(f);
    s->mctl = qemu_get_be32(f);
    s->mdv = qemu_get_be32(f);
    s->mtxd = qemu_get_be32(f);
    s->mrxd = qemu_get_be32(f);
    s->np = qemu_get_be32(f);
    s->tx_frame_len = qemu_get_be32(f);
    s->tx_fifo_len = qemu_get_be32(f);
    qemu_get_buffer(f, s->tx_fifo, sizeof(s->tx_fifo));
    for (i = 0; i < 31; i++) {
        s->rx[i].len = qemu_get_be32(f);
        qemu_get_buffer(f, s->rx[i].data, sizeof(s->rx[i].data));

    }
    s->next_packet = qemu_get_be32(f);
    s->rx_fifo = s->rx[s->next_packet].data + qemu_get_be32(f);
    s->rx_fifo_len = qemu_get_be32(f);

    return 0;
}

static void stellaris_enet_cleanup(NetClientState *nc)
{
    stellaris_enet_state *s = qemu_get_nic_opaque(nc);

    unregister_savevm(&s->busdev.qdev, "stellaris_enet", s);

    memory_region_destroy(&s->mmio);

    g_free(s);
}

static NetClientInfo net_stellaris_enet_info = {
    .type = NET_CLIENT_OPTIONS_KIND_NIC,
    .size = sizeof(NICState),
    .can_receive = stellaris_enet_can_receive,
    .receive = stellaris_enet_receive,
    .cleanup = stellaris_enet_cleanup,
};

static int stellaris_enet_init(SysBusDevice *dev)
{
    stellaris_enet_state *s = FROM_SYSBUS(stellaris_enet_state, dev);

    memory_region_init_io(&s->mmio, OBJECT(s), &stellaris_enet_ops, s,
                          "stellaris_enet", 0x1000);
    sysbus_init_mmio(dev, &s->mmio);
    sysbus_init_irq(dev, &s->irq);
    qemu_macaddr_default_if_unset(&s->conf.macaddr);

    s->nic = qemu_new_nic(&net_stellaris_enet_info, &s->conf,
                          object_get_typename(OBJECT(dev)), dev->qdev.id, s);
    qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);

    stellaris_enet_reset(s);
    register_savevm(&s->busdev.qdev, "stellaris_enet", -1, 1,
                    stellaris_enet_save, stellaris_enet_load, s);
    return 0;
}

static Property stellaris_enet_properties[] = {
    DEFINE_NIC_PROPERTIES(stellaris_enet_state, conf),
    DEFINE_PROP_END_OF_LIST(),
};

static void stellaris_enet_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = stellaris_enet_init;
    dc->props = stellaris_enet_properties;
}

static const TypeInfo stellaris_enet_info = {
    .name          = "stellaris_enet",
    .parent        = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(stellaris_enet_state),
    .class_init    = stellaris_enet_class_init,
};

static void stellaris_enet_register_types(void)
{
    type_register_static(&stellaris_enet_info);
}

type_init(stellaris_enet_register_types)