aboutsummaryrefslogtreecommitdiffstats
path: root/hw/bt-hci-csr.c
blob: 65ffa37fdf1c1975f087cb4250b9b068f28f8ca5 (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
/*
 * Bluetooth serial HCI transport.
 * CSR41814 HCI with H4p vendor extensions.
 *
 * Copyright (C) 2008 Andrzej Zaborowski  <balrog@zabor.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 or
 * (at your option) version 3 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "qemu-common.h"
#include "qemu-char.h"
#include "qemu-timer.h"
#include "irq.h"
#include "sysemu.h"
#include "net.h"
#include "bt.h"

struct csrhci_s {
    int enable;
    qemu_irq *pins;
    int pin_state;
    int modem_state;
    CharDriverState chr;
#define FIFO_LEN	4096
    int out_start;
    int out_len;
    int out_size;
    uint8_t outfifo[FIFO_LEN * 2];
    uint8_t inpkt[FIFO_LEN];
    int in_len;
    int in_hdr;
    int in_data;
    QEMUTimer *out_tm;
    int64_t baud_delay;

    bdaddr_t bd_addr;
    struct HCIInfo *hci;
};

/* H4+ packet types */
enum {
    H4_CMD_PKT   = 1,
    H4_ACL_PKT   = 2,
    H4_SCO_PKT   = 3,
    H4_EVT_PKT   = 4,
    H4_NEG_PKT   = 6,
    H4_ALIVE_PKT = 7,
};

/* CSR41814 negotiation start magic packet */
static const uint8_t csrhci_neg_packet[] = {
    H4_NEG_PKT, 10,
    0x00, 0xa0, 0x01, 0x00, 0x00,
    0x4c, 0x00, 0x96, 0x00, 0x00,
};

/* CSR41814 vendor-specific command OCFs */
enum {
    OCF_CSR_SEND_FIRMWARE = 0x000,
};

static inline void csrhci_fifo_wake(struct csrhci_s *s)
{
    if (!s->enable || !s->out_len)
        return;

    /* XXX: Should wait for s->modem_state & CHR_TIOCM_RTS? */
    if (s->chr.chr_can_read && s->chr.chr_can_read(s->chr.handler_opaque) &&
                    s->chr.chr_read) {
        s->chr.chr_read(s->chr.handler_opaque,
                        s->outfifo + s->out_start ++, 1);
        s->out_len --;
        if (s->out_start >= s->out_size) {
            s->out_start = 0;
            s->out_size = FIFO_LEN;
        }
    }

    if (s->out_len)
        qemu_mod_timer(s->out_tm, qemu_get_clock_ns(vm_clock) + s->baud_delay);
}

#define csrhci_out_packetz(s, len) memset(csrhci_out_packet(s, len), 0, len)
static uint8_t *csrhci_out_packet(struct csrhci_s *s, int len)
{
    int off = s->out_start + s->out_len;

    /* TODO: do the padding here, i.e. align len */
    s->out_len += len;

    if (off < FIFO_LEN) {
        if (off + len > FIFO_LEN && (s->out_size = off + len) > FIFO_LEN * 2) {
            fprintf(stderr, "%s: can't alloc %i bytes\n", __FUNCTION__, len);
            exit(-1);
        }
        return s->outfifo + off;
    }

    if (s->out_len > s->out_size) {
        fprintf(stderr, "%s: can't alloc %i bytes\n", __FUNCTION__, len);
        exit(-1);
    }

    return s->outfifo + off - s->out_size;
}

static inline uint8_t *csrhci_out_packet_csr(struct csrhci_s *s,
                int type, int len)
{
    uint8_t *ret = csrhci_out_packetz(s, len + 2);

    *ret ++ = type;
    *ret ++ = len;

    return ret;
}

static inline uint8_t *csrhci_out_packet_event(struct csrhci_s *s,
                int evt, int len)
{
    uint8_t *ret = csrhci_out_packetz(s,
                    len + 1 + sizeof(struct hci_event_hdr));

    *ret ++ = H4_EVT_PKT;
    ((struct hci_event_hdr *) ret)->evt = evt;
    ((struct hci_event_hdr *) ret)->plen = len;

    return ret + sizeof(struct hci_event_hdr);
}

static void csrhci_in_packet_vendor(struct csrhci_s *s, int ocf,
                uint8_t *data, int len)
{
    int offset;
    uint8_t *rpkt;

    switch (ocf) {
    case OCF_CSR_SEND_FIRMWARE:
        /* Check if this is the bd_address packet */
        if (len >= 18 + 8 && data[12] == 0x01 && data[13] == 0x00) {
            offset = 18;
            s->bd_addr.b[0] = data[offset + 7];	/* Beyond cmd packet end(!?) */
            s->bd_addr.b[1] = data[offset + 6];
            s->bd_addr.b[2] = data[offset + 4];
            s->bd_addr.b[3] = data[offset + 0];
            s->bd_addr.b[4] = data[offset + 3];
            s->bd_addr.b[5] = data[offset + 2];

            s->hci->bdaddr_set(s->hci, s->bd_addr.b);
            fprintf(stderr, "%s: bd_address loaded from firmware: "
                            "%02x:%02x:%02x:%02x:%02x:%02x\n", __FUNCTION__,
                            s->bd_addr.b[0], s->bd_addr.b[1], s->bd_addr.b[2],
                            s->bd_addr.b[3], s->bd_addr.b[4], s->bd_addr.b[5]);
        }

        rpkt = csrhci_out_packet_event(s, EVT_VENDOR, 11);
        /* Status bytes: no error */
        rpkt[9] = 0x00;
        rpkt[10] = 0x00;
        break;

    default:
        fprintf(stderr, "%s: got a bad CMD packet\n", __FUNCTION__);
        return;
    }

    csrhci_fifo_wake(s);
}

static void csrhci_in_packet(struct csrhci_s *s, uint8_t *pkt)
{
    uint8_t *rpkt;
    int opc;

    switch (*pkt ++) {
    case H4_CMD_PKT:
        opc = le16_to_cpu(((struct hci_command_hdr *) pkt)->opcode);
        if (cmd_opcode_ogf(opc) == OGF_VENDOR_CMD) {
            csrhci_in_packet_vendor(s, cmd_opcode_ocf(opc),
                            pkt + sizeof(struct hci_command_hdr),
                            s->in_len - sizeof(struct hci_command_hdr) - 1);
            return;
        }

        /* TODO: if the command is OCF_READ_LOCAL_COMMANDS or the likes,
         * we need to send it to the HCI layer and then add our supported
         * commands to the returned mask (such as OGF_VENDOR_CMD).  With
         * bt-hci.c we could just have hooks for this kind of commands but
         * we can't with bt-host.c.  */

        s->hci->cmd_send(s->hci, pkt, s->in_len - 1);
        break;

    case H4_EVT_PKT:
        goto bad_pkt;

    case H4_ACL_PKT:
        s->hci->acl_send(s->hci, pkt, s->in_len - 1);
        break;

    case H4_SCO_PKT:
        s->hci->sco_send(s->hci, pkt, s->in_len - 1);
        break;

    case H4_NEG_PKT:
        if (s->in_hdr != sizeof(csrhci_neg_packet) ||
                        memcmp(pkt - 1, csrhci_neg_packet, s->in_hdr)) {
            fprintf(stderr, "%s: got a bad NEG packet\n", __FUNCTION__);
            return;
        }
        pkt += 2;

        rpkt = csrhci_out_packet_csr(s, H4_NEG_PKT, 10);

        *rpkt ++ = 0x20;	/* Operational settings negotation Ok */
        memcpy(rpkt, pkt, 7); rpkt += 7;
        *rpkt ++ = 0xff;
        *rpkt = 0xff;
        break;

    case H4_ALIVE_PKT:
        if (s->in_hdr != 4 || pkt[1] != 0x55 || pkt[2] != 0x00) {
            fprintf(stderr, "%s: got a bad ALIVE packet\n", __FUNCTION__);
            return;
        }

        rpkt = csrhci_out_packet_csr(s, H4_ALIVE_PKT, 2);

        *rpkt ++ = 0xcc;
        *rpkt = 0x00;
        break;

    default:
    bad_pkt:
        /* TODO: error out */
        fprintf(stderr, "%s: got a bad packet\n", __FUNCTION__);
        break;
    }

    csrhci_fifo_wake(s);
}

static int csrhci_header_len(const uint8_t *pkt)
{
    switch (pkt[0]) {
    case H4_CMD_PKT:
        return HCI_COMMAND_HDR_SIZE;
    case H4_EVT_PKT:
        return HCI_EVENT_HDR_SIZE;
    case H4_ACL_PKT:
        return HCI_ACL_HDR_SIZE;
    case H4_SCO_PKT:
        return HCI_SCO_HDR_SIZE;
    case H4_NEG_PKT:
        return pkt[1] + 1;
    case H4_ALIVE_PKT:
        return 3;
    }

    exit(-1);
}

static int csrhci_data_len(const uint8_t *pkt)
{
    switch (*pkt ++) {
    case H4_CMD_PKT:
        /* It seems that vendor-specific command packets for H4+ are all
         * one byte longer than indicated in the standard header.  */
        if (le16_to_cpu(((struct hci_command_hdr *) pkt)->opcode) == 0xfc00)
            return (((struct hci_command_hdr *) pkt)->plen + 1) & ~1;

        return ((struct hci_command_hdr *) pkt)->plen;
    case H4_EVT_PKT:
        return ((struct hci_event_hdr *) pkt)->plen;
    case H4_ACL_PKT:
        return le16_to_cpu(((struct hci_acl_hdr *) pkt)->dlen);
    case H4_SCO_PKT:
        return ((struct hci_sco_hdr *) pkt)->dlen;
    case H4_NEG_PKT:
    case H4_ALIVE_PKT:
        return 0;
    }

    exit(-1);
}

static int csrhci_write(struct CharDriverState *chr,
                const uint8_t *buf, int len)
{
    struct csrhci_s *s = (struct csrhci_s *) chr->opaque;
    int plen = s->in_len;

    if (!s->enable)
        return 0;

    s->in_len += len;
    memcpy(s->inpkt + plen, buf, len);

    while (1) {
        if (s->in_len >= 2 && plen < 2)
            s->in_hdr = csrhci_header_len(s->inpkt) + 1;

        if (s->in_len >= s->in_hdr && plen < s->in_hdr)
            s->in_data = csrhci_data_len(s->inpkt) + s->in_hdr;

        if (s->in_len >= s->in_data) {
            csrhci_in_packet(s, s->inpkt);

            memmove(s->inpkt, s->inpkt + s->in_len, s->in_len - s->in_data);
            s->in_len -= s->in_data;
            s->in_hdr = INT_MAX;
            s->in_data = INT_MAX;
            plen = 0;
        } else
            break;
    }

    return len;
}

static void csrhci_out_hci_packet_event(void *opaque,
                const uint8_t *data, int len)
{
    struct csrhci_s *s = (struct csrhci_s *) opaque;
    uint8_t *pkt = csrhci_out_packet(s, (len + 2) & ~1);	/* Align */

    *pkt ++ = H4_EVT_PKT;
    memcpy(pkt, data, len);

    csrhci_fifo_wake(s);
}

static void csrhci_out_hci_packet_acl(void *opaque,
                const uint8_t *data, int len)
{
    struct csrhci_s *s = (struct csrhci_s *) opaque;
    uint8_t *pkt = csrhci_out_packet(s, (len + 2) & ~1);	/* Align */

    *pkt ++ = H4_ACL_PKT;
    pkt[len & ~1] = 0;
    memcpy(pkt, data, len);

    csrhci_fifo_wake(s);
}

static int csrhci_ioctl(struct CharDriverState *chr, int cmd, void *arg)
{
    QEMUSerialSetParams *ssp;
    struct csrhci_s *s = (struct csrhci_s *) chr->opaque;
    int prev_state = s->modem_state;

    switch (cmd) {
    case CHR_IOCTL_SERIAL_SET_PARAMS:
        ssp = (QEMUSerialSetParams *) arg;
        s->baud_delay = get_ticks_per_sec() / ssp->speed;
        /* Moments later... (but shorter than 100ms) */
        s->modem_state |= CHR_TIOCM_CTS;
        break;

    case CHR_IOCTL_SERIAL_GET_TIOCM:
        *(int *) arg = s->modem_state;
        break;

    case CHR_IOCTL_SERIAL_SET_TIOCM:
        s->modem_state = *(int *) arg;
        if (~s->modem_state & prev_state & CHR_TIOCM_RTS)
            s->modem_state &= ~CHR_TIOCM_CTS;
        break;

    default:
        return -ENOTSUP;
    }
    return 0;
}

static void csrhci_reset(struct csrhci_s *s)
{
    s->out_len = 0;
    s->out_size = FIFO_LEN;
    s->in_len = 0;
    s->baud_delay = get_ticks_per_sec();
    s->enable = 0;
    s->in_hdr = INT_MAX;
    s->in_data = INT_MAX;

    s->modem_state = 0;
    /* After a while... (but sooner than 10ms) */
    s->modem_state |= CHR_TIOCM_CTS;

    memset(&s->bd_addr, 0, sizeof(bdaddr_t));
}

static void csrhci_out_tick(void *opaque)
{
    csrhci_fifo_wake((struct csrhci_s *) opaque);
}

static void csrhci_pins(void *opaque, int line, int level)
{
    struct csrhci_s *s = (struct csrhci_s *) opaque;
    int state = s->pin_state;

    s->pin_state &= ~(1 << line);
    s->pin_state |= (!!level) << line;

    if ((state & ~s->pin_state) & (1 << csrhci_pin_reset)) {
        /* TODO: Disappear from lower layers */
        csrhci_reset(s);
    }

    if (s->pin_state == 3 && state != 3) {
        s->enable = 1;
        /* TODO: Wake lower layers up */
    }
}

qemu_irq *csrhci_pins_get(CharDriverState *chr)
{
    struct csrhci_s *s = (struct csrhci_s *) chr->opaque;

    return s->pins;
}

CharDriverState *uart_hci_init(qemu_irq wakeup)
{
    struct csrhci_s *s = (struct csrhci_s *)
            qemu_mallocz(sizeof(struct csrhci_s));

    s->chr.opaque = s;
    s->chr.chr_write = csrhci_write;
    s->chr.chr_ioctl = csrhci_ioctl;

    s->hci = qemu_next_hci();
    s->hci->opaque = s;
    s->hci->evt_recv = csrhci_out_hci_packet_event;
    s->hci->acl_recv = csrhci_out_hci_packet_acl;

    s->out_tm = qemu_new_timer_ns(vm_clock, csrhci_out_tick, s);
    s->pins = qemu_allocate_irqs(csrhci_pins, s, __csrhci_pins);
    csrhci_reset(s);

    return &s->chr;
}