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