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-common.h"
  22 #include "sysemu/char.h"
  23 #include "qemu/timer.h"
  24 #include "hw/irq.h"
  25 #include "sysemu/bt.h"
  26 #include "hw/bt.h"
  27
  28 struct csrhci_s {
  29     int enable;
  30     qemu_irq *pins;
  31     int pin_state;
  32     int modem_state;
  33     CharDriverState chr;
  34 #define FIFO_LEN        4096
  35     int out_start;
  36     int out_len;
  37     int out_size;
  38     uint8_t outfifo[FIFO_LEN * 2];
  39     uint8_t inpkt[FIFO_LEN];
  40     int in_len;
  41     int in_hdr;
  42     int in_data;
  43     QEMUTimer *out_tm;
  44     int64_t baud_delay;
  45
  46     bdaddr_t bd_addr;
  47     struct HCIInfo *hci;
  48 };
  49
  50 /* H4+ packet types */
  51 enum {
  52     H4_CMD_PKT   = 1,
  53     H4_ACL_PKT   = 2,
  54     H4_SCO_PKT   = 3,
  55     H4_EVT_PKT   = 4,
  56     H4_NEG_PKT   = 6,
  57     H4_ALIVE_PKT = 7,
  58 };
  59
  60 /* CSR41814 negotiation start magic packet */
  61 static const uint8_t csrhci_neg_packet[] = {
  62     H4_NEG_PKT, 10,
  63     0x00, 0xa0, 0x01, 0x00, 0x00,
  64     0x4c, 0x00, 0x96, 0x00, 0x00,
  65 };
  66
  67 /* CSR41814 vendor-specific command OCFs */
  68 enum {
  69     OCF_CSR_SEND_FIRMWARE = 0x000,
  70 };
  71
  72 static inline void csrhci_fifo_wake(struct csrhci_s *s)
  73 {
  74     if (!s->enable || !s->out_len)
  75         return;
  76
  77     /* XXX: Should wait for s->modem_state & CHR_TIOCM_RTS? */
  78     if (s->chr.chr_can_read && s->chr.chr_can_read(s->chr.handler_opaque) &&
  79                     s->chr.chr_read) {
  80         s->chr.chr_read(s->chr.handler_opaque,
  81                         s->outfifo + s->out_start ++, 1);
  82         s->out_len --;
  83         if (s->out_start >= s->out_size) {
  84             s->out_start = 0;
  85             s->out_size = FIFO_LEN;
  86         }
  87     }
  88
  89     if (s->out_len)
  90         timer_mod(s->out_tm, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->baud_delay);
  91 }
  92
  93 #define csrhci_out_packetz(s, len) memset(csrhci_out_packet(s, len), 0, len)
  94 static uint8_t *csrhci_out_packet(struct csrhci_s *s, int len)
  95 {
  96     int off = s->out_start + s->out_len;
  97
  98     /* TODO: do the padding here, i.e. align len */
  99     s->out_len += len;
 100
 101     if (off < FIFO_LEN) {
 102         if (off + len > FIFO_LEN && (s->out_size = off + len) > FIFO_LEN * 2) {
 103             fprintf(stderr, "%s: can't alloc %i bytes\n", __FUNCTION__, len);
 104             exit(-1);
 105         }
 106         return s->outfifo + off;
 107     }
 108
 109     if (s->out_len > s->out_size) {
 110         fprintf(stderr, "%s: can't alloc %i bytes\n", __FUNCTION__, len);
 111         exit(-1);
 112     }
 113
 114     return s->outfifo + off - s->out_size;
 115 }
 116
 117 static inline uint8_t *csrhci_out_packet_csr(struct csrhci_s *s,
 118                 int type, int len)
 119 {
 120     uint8_t *ret = csrhci_out_packetz(s, len + 2);
 121
 122     *ret ++ = type;
 123     *ret ++ = len;
 124
 125     return ret;
 126 }
 127
 128 static inline uint8_t *csrhci_out_packet_event(struct csrhci_s *s,
 129                 int evt, int len)
 130 {
 131     uint8_t *ret = csrhci_out_packetz(s,
 132                     len + 1 + sizeof(struct hci_event_hdr));
 133
 134     *ret ++ = H4_EVT_PKT;
 135     ((struct hci_event_hdr *) ret)->evt = evt;
 136     ((struct hci_event_hdr *) ret)->plen = len;
 137
 138     return ret + sizeof(struct hci_event_hdr);
 139 }
 140
 141 static void csrhci_in_packet_vendor(struct csrhci_s *s, int ocf,
 142                 uint8_t *data, int len)
 143 {
 144     int offset;
 145     uint8_t *rpkt;
 146
 147     switch (ocf) {
 148     case OCF_CSR_SEND_FIRMWARE:
 149         /* Check if this is the bd_address packet */
 150         if (len >= 18 + 8 && data[12] == 0x01 && data[13] == 0x00) {
 151             offset = 18;
 152             s->bd_addr.b[0] = data[offset + 7]; /* Beyond cmd packet end(!?) */
 153             s->bd_addr.b[1] = data[offset + 6];
 154             s->bd_addr.b[2] = data[offset + 4];
 155             s->bd_addr.b[3] = data[offset + 0];
 156             s->bd_addr.b[4] = data[offset + 3];
 157             s->bd_addr.b[5] = data[offset + 2];
 158
 159             s->hci->bdaddr_set(s->hci, s->bd_addr.b);
 160             fprintf(stderr, "%s: bd_address loaded from firmware: "
 161                             "%02x:%02x:%02x:%02x:%02x:%02x\n", __FUNCTION__,
 162                             s->bd_addr.b[0], s->bd_addr.b[1], s->bd_addr.b[2],
 163                             s->bd_addr.b[3], s->bd_addr.b[4], s->bd_addr.b[5]);
 164         }
 165
 166         rpkt = csrhci_out_packet_event(s, EVT_VENDOR, 11);
 167         /* Status bytes: no error */
 168         rpkt[9] = 0x00;
 169         rpkt[10] = 0x00;
 170         break;
 171
 172     default:
 173         fprintf(stderr, "%s: got a bad CMD packet\n", __FUNCTION__);
 174         return;
 175     }
 176
 177     csrhci_fifo_wake(s);
 178 }
 179
 180 static void csrhci_in_packet(struct csrhci_s *s, uint8_t *pkt)
 181 {
 182     uint8_t *rpkt;
 183     int opc;
 184
 185     switch (*pkt ++) {
 186     case H4_CMD_PKT:
 187         opc = le16_to_cpu(((struct hci_command_hdr *) pkt)->opcode);
 188         if (cmd_opcode_ogf(opc) == OGF_VENDOR_CMD) {
 189             csrhci_in_packet_vendor(s, cmd_opcode_ocf(opc),
 190                             pkt + sizeof(struct hci_command_hdr),
 191                             s->in_len - sizeof(struct hci_command_hdr) - 1);
 192             return;
 193         }
 194
 195         /* TODO: if the command is OCF_READ_LOCAL_COMMANDS or the likes,
 196          * we need to send it to the HCI layer and then add our supported
 197          * commands to the returned mask (such as OGF_VENDOR_CMD).  With
 198          * bt-hci.c we could just have hooks for this kind of commands but
 199          * we can't with bt-host.c.  */
 200
 201         s->hci->cmd_send(s->hci, pkt, s->in_len - 1);
 202         break;
 203
 204     case H4_EVT_PKT:
 205         goto bad_pkt;
 206
 207     case H4_ACL_PKT:
 208         s->hci->acl_send(s->hci, pkt, s->in_len - 1);
 209         break;
 210
 211     case H4_SCO_PKT:
 212         s->hci->sco_send(s->hci, pkt, s->in_len - 1);
 213         break;
 214
 215     case H4_NEG_PKT:
 216         if (s->in_hdr != sizeof(csrhci_neg_packet) ||
 217                         memcmp(pkt - 1, csrhci_neg_packet, s->in_hdr)) {
 218             fprintf(stderr, "%s: got a bad NEG packet\n", __FUNCTION__);
 219             return;
 220         }
 221         pkt += 2;
 222
 223         rpkt = csrhci_out_packet_csr(s, H4_NEG_PKT, 10);
 224
 225         *rpkt ++ = 0x20;        /* Operational settings negotiation Ok */
 226         memcpy(rpkt, pkt, 7); rpkt += 7;
 227         *rpkt ++ = 0xff;
 228         *rpkt = 0xff;
 229         break;
 230
 231     case H4_ALIVE_PKT:
 232         if (s->in_hdr != 4 || pkt[1] != 0x55 || pkt[2] != 0x00) {
 233             fprintf(stderr, "%s: got a bad ALIVE packet\n", __FUNCTION__);
 234             return;
 235         }
 236
 237         rpkt = csrhci_out_packet_csr(s, H4_ALIVE_PKT, 2);
 238
 239         *rpkt ++ = 0xcc;
 240         *rpkt = 0x00;
 241         break;
 242
 243     default:
 244     bad_pkt:
 245         /* TODO: error out */
 246         fprintf(stderr, "%s: got a bad packet\n", __FUNCTION__);
 247         break;
 248     }
 249
 250     csrhci_fifo_wake(s);
 251 }
 252
 253 static int csrhci_header_len(const uint8_t *pkt)
 254 {
 255     switch (pkt[0]) {
 256     case H4_CMD_PKT:
 257         return HCI_COMMAND_HDR_SIZE;
 258     case H4_EVT_PKT:
 259         return HCI_EVENT_HDR_SIZE;
 260     case H4_ACL_PKT:
 261         return HCI_ACL_HDR_SIZE;
 262     case H4_SCO_PKT:
 263         return HCI_SCO_HDR_SIZE;
 264     case H4_NEG_PKT:
 265         return pkt[1] + 1;
 266     case H4_ALIVE_PKT:
 267         return 3;
 268     }
 269
 270     exit(-1);
 271 }
 272
 273 static int csrhci_data_len(const uint8_t *pkt)
 274 {
 275     switch (*pkt ++) {
 276     case H4_CMD_PKT:
 277         /* It seems that vendor-specific command packets for H4+ are all
 278          * one byte longer than indicated in the standard header.  */
 279         if (le16_to_cpu(((struct hci_command_hdr *) pkt)->opcode) == 0xfc00)
 280             return (((struct hci_command_hdr *) pkt)->plen + 1) & ~1;
 281
 282         return ((struct hci_command_hdr *) pkt)->plen;
 283     case H4_EVT_PKT:
 284         return ((struct hci_event_hdr *) pkt)->plen;
 285     case H4_ACL_PKT:
 286         return le16_to_cpu(((struct hci_acl_hdr *) pkt)->dlen);
 287     case H4_SCO_PKT:
 288         return ((struct hci_sco_hdr *) pkt)->dlen;
 289     case H4_NEG_PKT:
 290     case H4_ALIVE_PKT:
 291         return 0;
 292     }
 293
 294     exit(-1);
 295 }
 296
 297 static int csrhci_write(struct CharDriverState *chr,
 298                 const uint8_t *buf, int len)
 299 {
 300     struct csrhci_s *s = (struct csrhci_s *) chr->opaque;
 301     int plen = s->in_len;
 302
 303     if (!s->enable)
 304         return 0;
 305
 306     s->in_len += len;
 307     memcpy(s->inpkt + plen, buf, len);
 308
 309     while (1) {
 310         if (s->in_len >= 2 && plen < 2)
 311             s->in_hdr = csrhci_header_len(s->inpkt) + 1;
 312
 313         if (s->in_len >= s->in_hdr && plen < s->in_hdr)
 314             s->in_data = csrhci_data_len(s->inpkt) + s->in_hdr;
 315
 316         if (s->in_len >= s->in_data) {
 317             csrhci_in_packet(s, s->inpkt);
 318
 319             memmove(s->inpkt, s->inpkt + s->in_len, s->in_len - s->in_data);
 320             s->in_len -= s->in_data;
 321             s->in_hdr = INT_MAX;
 322             s->in_data = INT_MAX;
 323             plen = 0;
 324         } else
 325             break;
 326     }
 327
 328     return len;
 329 }
 330
 331 static void csrhci_out_hci_packet_event(void *opaque,
 332                 const uint8_t *data, int len)
 333 {
 334     struct csrhci_s *s = (struct csrhci_s *) opaque;
 335     uint8_t *pkt = csrhci_out_packet(s, (len + 2) & ~1);        /* Align */
 336
 337     *pkt ++ = H4_EVT_PKT;
 338     memcpy(pkt, data, len);
 339
 340     csrhci_fifo_wake(s);
 341 }
 342
 343 static void csrhci_out_hci_packet_acl(void *opaque,
 344                 const uint8_t *data, int len)
 345 {
 346     struct csrhci_s *s = (struct csrhci_s *) opaque;
 347     uint8_t *pkt = csrhci_out_packet(s, (len + 2) & ~1);        /* Align */
 348
 349     *pkt ++ = H4_ACL_PKT;
 350     pkt[len & ~1] = 0;
 351     memcpy(pkt, data, len);
 352
 353     csrhci_fifo_wake(s);
 354 }
 355
 356 static int csrhci_ioctl(struct CharDriverState *chr, int cmd, void *arg)
 357 {
 358     QEMUSerialSetParams *ssp;
 359     struct csrhci_s *s = (struct csrhci_s *) chr->opaque;
 360     int prev_state = s->modem_state;
 361
 362     switch (cmd) {
 363     case CHR_IOCTL_SERIAL_SET_PARAMS:
 364         ssp = (QEMUSerialSetParams *) arg;
 365         s->baud_delay = get_ticks_per_sec() / ssp->speed;
 366         /* Moments later... (but shorter than 100ms) */
 367         s->modem_state |= CHR_TIOCM_CTS;
 368         break;
 369
 370     case CHR_IOCTL_SERIAL_GET_TIOCM:
 371         *(int *) arg = s->modem_state;
 372         break;
 373
 374     case CHR_IOCTL_SERIAL_SET_TIOCM:
 375         s->modem_state = *(int *) arg;
 376         if (~s->modem_state & prev_state & CHR_TIOCM_RTS)
 377             s->modem_state &= ~CHR_TIOCM_CTS;
 378         break;
 379
 380     default:
 381         return -ENOTSUP;
 382     }
 383     return 0;
 384 }
 385
 386 static void csrhci_reset(struct csrhci_s *s)
 387 {
 388     s->out_len = 0;
 389     s->out_size = FIFO_LEN;
 390     s->in_len = 0;
 391     s->baud_delay = get_ticks_per_sec();
 392     s->enable = 0;
 393     s->in_hdr = INT_MAX;
 394     s->in_data = INT_MAX;
 395
 396     s->modem_state = 0;
 397     /* After a while... (but sooner than 10ms) */
 398     s->modem_state |= CHR_TIOCM_CTS;
 399
 400     memset(&s->bd_addr, 0, sizeof(bdaddr_t));
 401 }
 402
 403 static void csrhci_out_tick(void *opaque)
 404 {
 405     csrhci_fifo_wake((struct csrhci_s *) opaque);
 406 }
 407
 408 static void csrhci_pins(void *opaque, int line, int level)
 409 {
 410     struct csrhci_s *s = (struct csrhci_s *) opaque;
 411     int state = s->pin_state;
 412
 413     s->pin_state &= ~(1 << line);
 414     s->pin_state |= (!!level) << line;
 415
 416     if ((state & ~s->pin_state) & (1 << csrhci_pin_reset)) {
 417         /* TODO: Disappear from lower layers */
 418         csrhci_reset(s);
 419     }
 420
 421     if (s->pin_state == 3 && state != 3) {
 422         s->enable = 1;
 423         /* TODO: Wake lower layers up */
 424     }
 425 }
 426
 427 qemu_irq *csrhci_pins_get(CharDriverState *chr)
 428 {
 429     struct csrhci_s *s = (struct csrhci_s *) chr->opaque;
 430
 431     return s->pins;
 432 }
 433
 434 CharDriverState *uart_hci_init(qemu_irq wakeup)
 435 {
 436     struct csrhci_s *s = (struct csrhci_s *)
 437             g_malloc0(sizeof(struct csrhci_s));
 438
 439     s->chr.opaque = s;
 440     s->chr.chr_write = csrhci_write;
 441     s->chr.chr_ioctl = csrhci_ioctl;
 442     s->chr.avail_connections = 1;
 443
 444     s->hci = qemu_next_hci();
 445     s->hci->opaque = s;
 446     s->hci->evt_recv = csrhci_out_hci_packet_event;
 447     s->hci->acl_recv = csrhci_out_hci_packet_acl;
 448
 449     s->out_tm = timer_new_ns(QEMU_CLOCK_VIRTUAL, csrhci_out_tick, s);
 450     s->pins = qemu_allocate_irqs(csrhci_pins, s, __csrhci_pins);
 451     csrhci_reset(s);
 452
 453     return &s->chr;
 454 }