hw/bt/hci-csr.c

   1 /*
   2  * Bluetooth serial HCI transport.
   3  * CSR41814 HCI with H4p vendor extensions.
   4  *
   5  * Copyright (C) 2008 Andrzej Zaborowski  <balrog@zabor.org>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 or
  10  * (at your option) version 3 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qemu-common.h"
  23 #include "sysemu/char.h"
  24 #include "qemu/timer.h"
  25 #include "qemu/bswap.h"
  26 #include "hw/irq.h"
  27 #include "sysemu/bt.h"
  28 #include "hw/bt.h"
  29 #include "qapi/error.h"
  30
  31 struct csrhci_s {
  32     Chardev parent;
  33     int enable;
  34     qemu_irq *pins;
  35     int pin_state;
  36     int modem_state;
  37 #define FIFO_LEN        4096
  38     int out_start;
  39     int out_len;
  40     int out_size;
  41     uint8_t outfifo[FIFO_LEN * 2];
  42     uint8_t inpkt[FIFO_LEN];
  43     enum {
  44         CSR_HDR_LEN,
  45         CSR_DATA_LEN,
  46         CSR_DATA
  47     } in_state;
  48     int in_len;
  49     int in_hdr;
  50     int in_needed;
  51     QEMUTimer *out_tm;
  52     int64_t baud_delay;
  53
  54     bdaddr_t bd_addr;
  55     struct HCIInfo *hci;
  56 };
  57
  58 /* H4+ packet types */
  59 enum {
  60     H4_CMD_PKT   = 1,
  61     H4_ACL_PKT   = 2,
  62     H4_SCO_PKT   = 3,
  63     H4_EVT_PKT   = 4,
  64     H4_NEG_PKT   = 6,
  65     H4_ALIVE_PKT = 7,
  66 };
  67
  68 /* CSR41814 negotiation start magic packet */
  69 static const uint8_t csrhci_neg_packet[] = {
  70     H4_NEG_PKT, 10,
  71     0x00, 0xa0, 0x01, 0x00, 0x00,
  72     0x4c, 0x00, 0x96, 0x00, 0x00,
  73 };
  74
  75 /* CSR41814 vendor-specific command OCFs */
  76 enum {
  77     OCF_CSR_SEND_FIRMWARE = 0x000,
  78 };
  79
  80 static inline void csrhci_fifo_wake(struct csrhci_s *s)
  81 {
  82     Chardev *chr = (Chardev *)s;
  83     CharBackend *be = chr->be;
  84
  85     if (!s->enable || !s->out_len)
  86         return;
  87
  88     /* XXX: Should wait for s->modem_state & CHR_TIOCM_RTS? */
  89     if (be && be->chr_can_read && be->chr_can_read(be->opaque) &&
  90         be->chr_read) {
  91         be->chr_read(be->opaque,
  92                      s->outfifo + s->out_start++, 1);
  93         s->out_len--;
  94         if (s->out_start >= s->out_size) {
  95             s->out_start = 0;
  96             s->out_size = FIFO_LEN;
  97         }
  98     }
  99
 100     if (s->out_len)
 101         timer_mod(s->out_tm, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->baud_delay);
 102 }
 103
 104 #define csrhci_out_packetz(s, len) memset(csrhci_out_packet(s, len), 0, len)
 105 static uint8_t *csrhci_out_packet(struct csrhci_s *s, int len)
 106 {
 107     int off = s->out_start + s->out_len;
 108
 109     /* TODO: do the padding here, i.e. align len */
 110     s->out_len += len;
 111
 112     if (off < FIFO_LEN) {
 113         if (off + len > FIFO_LEN && (s->out_size = off + len) > FIFO_LEN * 2) {
 114             fprintf(stderr, "%s: can't alloc %i bytes\n", __FUNCTION__, len);
 115             exit(-1);
 116         }
 117         return s->outfifo + off;
 118     }
 119
 120     if (s->out_len > s->out_size) {
 121         fprintf(stderr, "%s: can't alloc %i bytes\n", __FUNCTION__, len);
 122         exit(-1);
 123     }
 124
 125     return s->outfifo + off - s->out_size;
 126 }
 127
 128 static inline uint8_t *csrhci_out_packet_csr(struct csrhci_s *s,
 129                 int type, int len)
 130 {
 131     uint8_t *ret = csrhci_out_packetz(s, len + 2);
 132
 133     *ret ++ = type;
 134     *ret ++ = len;
 135
 136     return ret;
 137 }
 138
 139 static inline uint8_t *csrhci_out_packet_event(struct csrhci_s *s,
 140                 int evt, int len)
 141 {
 142     uint8_t *ret = csrhci_out_packetz(s,
 143                     len + 1 + sizeof(struct hci_event_hdr));
 144
 145     *ret ++ = H4_EVT_PKT;
 146     ((struct hci_event_hdr *) ret)->evt = evt;
 147     ((struct hci_event_hdr *) ret)->plen = len;
 148
 149     return ret + sizeof(struct hci_event_hdr);
 150 }
 151
 152 static void csrhci_in_packet_vendor(struct csrhci_s *s, int ocf,
 153                 uint8_t *data, int len)
 154 {
 155     int offset;
 156     uint8_t *rpkt;
 157
 158     switch (ocf) {
 159     case OCF_CSR_SEND_FIRMWARE:
 160         /* Check if this is the bd_address packet */
 161         if (len >= 18 + 8 && data[12] == 0x01 && data[13] == 0x00) {
 162             offset = 18;
 163             s->bd_addr.b[0] = data[offset + 7]; /* Beyond cmd packet end(!?) */
 164             s->bd_addr.b[1] = data[offset + 6];
 165             s->bd_addr.b[2] = data[offset + 4];
 166             s->bd_addr.b[3] = data[offset + 0];
 167             s->bd_addr.b[4] = data[offset + 3];
 168             s->bd_addr.b[5] = data[offset + 2];
 169
 170             s->hci->bdaddr_set(s->hci, s->bd_addr.b);
 171             fprintf(stderr, "%s: bd_address loaded from firmware: "
 172                             "%02x:%02x:%02x:%02x:%02x:%02x\n", __FUNCTION__,
 173                             s->bd_addr.b[0], s->bd_addr.b[1], s->bd_addr.b[2],
 174                             s->bd_addr.b[3], s->bd_addr.b[4], s->bd_addr.b[5]);
 175         }
 176
 177         rpkt = csrhci_out_packet_event(s, EVT_VENDOR, 11);
 178         /* Status bytes: no error */
 179         rpkt[9] = 0x00;
 180         rpkt[10] = 0x00;
 181         break;
 182
 183     default:
 184         fprintf(stderr, "%s: got a bad CMD packet\n", __FUNCTION__);
 185         return;
 186     }
 187
 188     csrhci_fifo_wake(s);
 189 }
 190
 191 static void csrhci_in_packet(struct csrhci_s *s, uint8_t *pkt)
 192 {
 193     uint8_t *rpkt;
 194     int opc;
 195
 196     switch (*pkt ++) {
 197     case H4_CMD_PKT:
 198         opc = le16_to_cpu(((struct hci_command_hdr *) pkt)->opcode);
 199         if (cmd_opcode_ogf(opc) == OGF_VENDOR_CMD) {
 200             csrhci_in_packet_vendor(s, cmd_opcode_ocf(opc),
 201                             pkt + sizeof(struct hci_command_hdr),
 202                             s->in_len - sizeof(struct hci_command_hdr) - 1);
 203             return;
 204         }
 205
 206         /* TODO: if the command is OCF_READ_LOCAL_COMMANDS or the likes,
 207          * we need to send it to the HCI layer and then add our supported
 208          * commands to the returned mask (such as OGF_VENDOR_CMD).  With
 209          * bt-hci.c we could just have hooks for this kind of commands but
 210          * we can't with bt-host.c.  */
 211
 212         s->hci->cmd_send(s->hci, pkt, s->in_len - 1);
 213         break;
 214
 215     case H4_EVT_PKT:
 216         goto bad_pkt;
 217
 218     case H4_ACL_PKT:
 219         s->hci->acl_send(s->hci, pkt, s->in_len - 1);
 220         break;
 221
 222     case H4_SCO_PKT:
 223         s->hci->sco_send(s->hci, pkt, s->in_len - 1);
 224         break;
 225
 226     case H4_NEG_PKT:
 227         if (s->in_hdr != sizeof(csrhci_neg_packet) ||
 228                         memcmp(pkt - 1, csrhci_neg_packet, s->in_hdr)) {
 229             fprintf(stderr, "%s: got a bad NEG packet\n", __FUNCTION__);
 230             return;
 231         }
 232         pkt += 2;
 233
 234         rpkt = csrhci_out_packet_csr(s, H4_NEG_PKT, 10);
 235
 236         *rpkt ++ = 0x20;        /* Operational settings negotiation Ok */
 237         memcpy(rpkt, pkt, 7); rpkt += 7;
 238         *rpkt ++ = 0xff;
 239         *rpkt = 0xff;
 240         break;
 241
 242     case H4_ALIVE_PKT:
 243         if (s->in_hdr != 4 || pkt[1] != 0x55 || pkt[2] != 0x00) {
 244             fprintf(stderr, "%s: got a bad ALIVE packet\n", __FUNCTION__);
 245             return;
 246         }
 247
 248         rpkt = csrhci_out_packet_csr(s, H4_ALIVE_PKT, 2);
 249
 250         *rpkt ++ = 0xcc;
 251         *rpkt = 0x00;
 252         break;
 253
 254     default:
 255     bad_pkt:
 256         /* TODO: error out */
 257         fprintf(stderr, "%s: got a bad packet\n", __FUNCTION__);
 258         break;
 259     }
 260
 261     csrhci_fifo_wake(s);
 262 }
 263
 264 static int csrhci_header_len(const uint8_t *pkt)
 265 {
 266     switch (pkt[0]) {
 267     case H4_CMD_PKT:
 268         return HCI_COMMAND_HDR_SIZE;
 269     case H4_EVT_PKT:
 270         return HCI_EVENT_HDR_SIZE;
 271     case H4_ACL_PKT:
 272         return HCI_ACL_HDR_SIZE;
 273     case H4_SCO_PKT:
 274         return HCI_SCO_HDR_SIZE;
 275     case H4_NEG_PKT:
 276         return pkt[1] + 1;
 277     case H4_ALIVE_PKT:
 278         return 3;
 279     }
 280
 281     exit(-1);
 282 }
 283
 284 static int csrhci_data_len(const uint8_t *pkt)
 285 {
 286     switch (*pkt ++) {
 287     case H4_CMD_PKT:
 288         /* It seems that vendor-specific command packets for H4+ are all
 289          * one byte longer than indicated in the standard header.  */
 290         if (le16_to_cpu(((struct hci_command_hdr *) pkt)->opcode) == 0xfc00)
 291             return (((struct hci_command_hdr *) pkt)->plen + 1) & ~1;
 292
 293         return ((struct hci_command_hdr *) pkt)->plen;
 294     case H4_EVT_PKT:
 295         return ((struct hci_event_hdr *) pkt)->plen;
 296     case H4_ACL_PKT:
 297         return le16_to_cpu(((struct hci_acl_hdr *) pkt)->dlen);
 298     case H4_SCO_PKT:
 299         return ((struct hci_sco_hdr *) pkt)->dlen;
 300     case H4_NEG_PKT:
 301     case H4_ALIVE_PKT:
 302         return 0;
 303     }
 304
 305     exit(-1);
 306 }
 307
 308 static void csrhci_ready_for_next_inpkt(struct csrhci_s *s)
 309 {
 310     s->in_state = CSR_HDR_LEN;
 311     s->in_len = 0;
 312     s->in_needed = 2;
 313     s->in_hdr = INT_MAX;
 314 }
 315
 316 static int csrhci_write(struct Chardev *chr,
 317                 const uint8_t *buf, int len)
 318 {
 319     struct csrhci_s *s = (struct csrhci_s *)chr;
 320     int total = 0;
 321
 322     if (!s->enable)
 323         return 0;
 324
 325     for (;;) {
 326         int cnt = MIN(len, s->in_needed - s->in_len);
 327         if (cnt) {
 328             memcpy(s->inpkt + s->in_len, buf, cnt);
 329             s->in_len += cnt;
 330             buf += cnt;
 331             len -= cnt;
 332             total += cnt;
 333         }
 334
 335         if (s->in_len < s->in_needed) {
 336             break;
 337         }
 338
 339         if (s->in_state == CSR_HDR_LEN) {
 340             s->in_hdr = csrhci_header_len(s->inpkt) + 1;
 341             assert(s->in_hdr >= s->in_needed);
 342             s->in_needed = s->in_hdr;
 343             s->in_state = CSR_DATA_LEN;
 344             continue;
 345         }
 346
 347         if (s->in_state == CSR_DATA_LEN) {
 348             s->in_needed += csrhci_data_len(s->inpkt);
 349             /* hci_acl_hdr could specify more than 4096 bytes, so assert.  */
 350             assert(s->in_needed <= sizeof(s->inpkt));
 351             s->in_state = CSR_DATA;
 352             continue;
 353         }
 354
 355         if (s->in_state == CSR_DATA) {
 356             csrhci_in_packet(s, s->inpkt);
 357             csrhci_ready_for_next_inpkt(s);
 358         }
 359     }
 360
 361     return total;
 362 }
 363
 364 static void csrhci_out_hci_packet_event(void *opaque,
 365                 const uint8_t *data, int len)
 366 {
 367     struct csrhci_s *s = (struct csrhci_s *) opaque;
 368     uint8_t *pkt = csrhci_out_packet(s, (len + 2) & ~1);        /* Align */
 369
 370     *pkt ++ = H4_EVT_PKT;
 371     memcpy(pkt, data, len);
 372
 373     csrhci_fifo_wake(s);
 374 }
 375
 376 static void csrhci_out_hci_packet_acl(void *opaque,
 377                 const uint8_t *data, int len)
 378 {
 379     struct csrhci_s *s = (struct csrhci_s *) opaque;
 380     uint8_t *pkt = csrhci_out_packet(s, (len + 2) & ~1);        /* Align */
 381
 382     *pkt ++ = H4_ACL_PKT;
 383     pkt[len & ~1] = 0;
 384     memcpy(pkt, data, len);
 385
 386     csrhci_fifo_wake(s);
 387 }
 388
 389 static int csrhci_ioctl(struct Chardev *chr, int cmd, void *arg)
 390 {
 391     QEMUSerialSetParams *ssp;
 392     struct csrhci_s *s = (struct csrhci_s *) chr;
 393     int prev_state = s->modem_state;
 394
 395     switch (cmd) {
 396     case CHR_IOCTL_SERIAL_SET_PARAMS:
 397         ssp = (QEMUSerialSetParams *) arg;
 398         s->baud_delay = NANOSECONDS_PER_SECOND / ssp->speed;
 399         /* Moments later... (but shorter than 100ms) */
 400         s->modem_state |= CHR_TIOCM_CTS;
 401         break;
 402
 403     case CHR_IOCTL_SERIAL_GET_TIOCM:
 404         *(int *) arg = s->modem_state;
 405         break;
 406
 407     case CHR_IOCTL_SERIAL_SET_TIOCM:
 408         s->modem_state = *(int *) arg;
 409         if (~s->modem_state & prev_state & CHR_TIOCM_RTS)
 410             s->modem_state &= ~CHR_TIOCM_CTS;
 411         break;
 412
 413     default:
 414         return -ENOTSUP;
 415     }
 416     return 0;
 417 }
 418
 419 static void csrhci_reset(struct csrhci_s *s)
 420 {
 421     s->out_len = 0;
 422     s->out_size = FIFO_LEN;
 423     csrhci_ready_for_next_inpkt(s);
 424     s->baud_delay = NANOSECONDS_PER_SECOND;
 425     s->enable = 0;
 426
 427     s->modem_state = 0;
 428     /* After a while... (but sooner than 10ms) */
 429     s->modem_state |= CHR_TIOCM_CTS;
 430
 431     memset(&s->bd_addr, 0, sizeof(bdaddr_t));
 432 }
 433
 434 static void csrhci_out_tick(void *opaque)
 435 {
 436     csrhci_fifo_wake((struct csrhci_s *) opaque);
 437 }
 438
 439 static void csrhci_pins(void *opaque, int line, int level)
 440 {
 441     struct csrhci_s *s = (struct csrhci_s *) opaque;
 442     int state = s->pin_state;
 443
 444     s->pin_state &= ~(1 << line);
 445     s->pin_state |= (!!level) << line;
 446
 447     if ((state & ~s->pin_state) & (1 << csrhci_pin_reset)) {
 448         /* TODO: Disappear from lower layers */
 449         csrhci_reset(s);
 450     }
 451
 452     if (s->pin_state == 3 && state != 3) {
 453         s->enable = 1;
 454         /* TODO: Wake lower layers up */
 455     }
 456 }
 457
 458 qemu_irq *csrhci_pins_get(Chardev *chr)
 459 {
 460     struct csrhci_s *s = (struct csrhci_s *) chr;
 461
 462     return s->pins;
 463 }
 464
 465 Chardev *uart_hci_init(void)
 466 {
 467     static const CharDriver hci_driver = {
 468         .instance_size = sizeof(struct csrhci_s),
 469         .kind = -1,
 470         .chr_write = csrhci_write,
 471         .chr_ioctl = csrhci_ioctl,
 472     };
 473     Error *err = NULL;
 474     ChardevCommon common = { 0, };
 475     Chardev *chr = qemu_chr_alloc(&hci_driver, &common, &err);
 476     struct csrhci_s *s = (struct csrhci_s *)chr;
 477
 478     if (err) {
 479         error_report_err(err);
 480         return NULL;
 481     }
 482
 483     s->hci = qemu_next_hci();
 484     s->hci->opaque = s;
 485     s->hci->evt_recv = csrhci_out_hci_packet_event;
 486     s->hci->acl_recv = csrhci_out_hci_packet_acl;
 487
 488     s->out_tm = timer_new_ns(QEMU_CLOCK_VIRTUAL, csrhci_out_tick, s);
 489     s->pins = qemu_allocate_irqs(csrhci_pins, s, __csrhci_pins);
 490     csrhci_reset(s);
 491
 492     return chr;
 493 }