drivers/bluetooth/bt3c_cs.c

   1 /*
   2  *
   3  *  Driver for the 3Com Bluetooth PCMCIA card
   4  *
   5  *  Copyright (C) 2001-2002  Marcel Holtmann <marcel@holtmann.org>
   6  *                           Jose Orlando Pereira <jop@di.uminho.pt>
   7  *
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2 as
  11  *  published by the Free Software Foundation;
  12  *
  13  *  Software distributed under the License is distributed on an "AS
  14  *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  15  *  implied. See the License for the specific language governing
  16  *  rights and limitations under the License.
  17  *
  18  *  The initial developer of the original code is David A. Hinds
  19  *  <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  20  *  are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/types.h>
  30 #include <linux/delay.h>
  31 #include <linux/errno.h>
  32 #include <linux/ptrace.h>
  33 #include <linux/ioport.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/moduleparam.h>
  36
  37 #include <linux/skbuff.h>
  38 #include <linux/string.h>
  39 #include <linux/serial.h>
  40 #include <linux/serial_reg.h>
  41 #include <linux/bitops.h>
  42 #include <asm/io.h>
  43
  44 #include <linux/device.h>
  45 #include <linux/firmware.h>
  46
  47 #include <pcmcia/cistpl.h>
  48 #include <pcmcia/ciscode.h>
  49 #include <pcmcia/ds.h>
  50 #include <pcmcia/cisreg.h>
  51
  52 #include <net/bluetooth/bluetooth.h>
  53 #include <net/bluetooth/hci_core.h>
  54
  55
  56
  57 /* ======================== Module parameters ======================== */
  58
  59
  60 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
  61 MODULE_DESCRIPTION("Bluetooth driver for the 3Com Bluetooth PCMCIA card");
  62 MODULE_LICENSE("GPL");
  63 MODULE_FIRMWARE("BT3CPCC.bin");
  64
  65
  66
  67 /* ======================== Local structures ======================== */
  68
  69
  70 struct bt3c_info {
  71         struct pcmcia_device *p_dev;
  72
  73         struct hci_dev *hdev;
  74
  75         spinlock_t lock;                /* For serializing operations */
  76
  77         struct sk_buff_head txq;
  78         unsigned long tx_state;
  79
  80         unsigned long rx_state;
  81         unsigned long rx_count;
  82         struct sk_buff *rx_skb;
  83 };
  84
  85
  86 static int bt3c_config(struct pcmcia_device *link);
  87 static void bt3c_release(struct pcmcia_device *link);
  88
  89 static void bt3c_detach(struct pcmcia_device *p_dev);
  90
  91
  92 /* Transmit states  */
  93 #define XMIT_SENDING  1
  94 #define XMIT_WAKEUP   2
  95 #define XMIT_WAITING  8
  96
  97 /* Receiver states */
  98 #define RECV_WAIT_PACKET_TYPE   0
  99 #define RECV_WAIT_EVENT_HEADER  1
 100 #define RECV_WAIT_ACL_HEADER    2
 101 #define RECV_WAIT_SCO_HEADER    3
 102 #define RECV_WAIT_DATA          4
 103
 104
 105
 106 /* ======================== Special I/O functions ======================== */
 107
 108
 109 #define DATA_L   0
 110 #define DATA_H   1
 111 #define ADDR_L   2
 112 #define ADDR_H   3
 113 #define CONTROL  4
 114
 115
 116 static inline void bt3c_address(unsigned int iobase, unsigned short addr)
 117 {
 118         outb(addr & 0xff, iobase + ADDR_L);
 119         outb((addr >> 8) & 0xff, iobase + ADDR_H);
 120 }
 121
 122
 123 static inline void bt3c_put(unsigned int iobase, unsigned short value)
 124 {
 125         outb(value & 0xff, iobase + DATA_L);
 126         outb((value >> 8) & 0xff, iobase + DATA_H);
 127 }
 128
 129
 130 static inline void bt3c_io_write(unsigned int iobase, unsigned short addr, unsigned short value)
 131 {
 132         bt3c_address(iobase, addr);
 133         bt3c_put(iobase, value);
 134 }
 135
 136
 137 static inline unsigned short bt3c_get(unsigned int iobase)
 138 {
 139         unsigned short value = inb(iobase + DATA_L);
 140
 141         value |= inb(iobase + DATA_H) << 8;
 142
 143         return value;
 144 }
 145
 146
 147 static inline unsigned short bt3c_read(unsigned int iobase, unsigned short addr)
 148 {
 149         bt3c_address(iobase, addr);
 150
 151         return bt3c_get(iobase);
 152 }
 153
 154
 155
 156 /* ======================== Interrupt handling ======================== */
 157
 158
 159 static int bt3c_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
 160 {
 161         int actual = 0;
 162
 163         bt3c_address(iobase, 0x7080);
 164
 165         /* Fill FIFO with current frame */
 166         while (actual < len) {
 167                 /* Transmit next byte */
 168                 bt3c_put(iobase, buf[actual]);
 169                 actual++;
 170         }
 171
 172         bt3c_io_write(iobase, 0x7005, actual);
 173
 174         return actual;
 175 }
 176
 177
 178 static void bt3c_write_wakeup(struct bt3c_info *info)
 179 {
 180         if (!info) {
 181                 BT_ERR("Unknown device");
 182                 return;
 183         }
 184
 185         if (test_and_set_bit(XMIT_SENDING, &(info->tx_state)))
 186                 return;
 187
 188         do {
 189                 unsigned int iobase = info->p_dev->resource[0]->start;
 190                 register struct sk_buff *skb;
 191                 int len;
 192
 193                 if (!pcmcia_dev_present(info->p_dev))
 194                         break;
 195
 196                 skb = skb_dequeue(&(info->txq));
 197                 if (!skb) {
 198                         clear_bit(XMIT_SENDING, &(info->tx_state));
 199                         break;
 200                 }
 201
 202                 /* Send frame */
 203                 len = bt3c_write(iobase, 256, skb->data, skb->len);
 204
 205                 if (len != skb->len)
 206                         BT_ERR("Very strange");
 207
 208                 kfree_skb(skb);
 209
 210                 info->hdev->stat.byte_tx += len;
 211
 212         } while (0);
 213 }
 214
 215
 216 static void bt3c_receive(struct bt3c_info *info)
 217 {
 218         unsigned int iobase;
 219         int size = 0, avail;
 220
 221         if (!info) {
 222                 BT_ERR("Unknown device");
 223                 return;
 224         }
 225
 226         iobase = info->p_dev->resource[0]->start;
 227
 228         avail = bt3c_read(iobase, 0x7006);
 229
 230         bt3c_address(iobase, 0x7480);
 231         while (size < avail) {
 232                 size++;
 233                 info->hdev->stat.byte_rx++;
 234
 235                 /* Allocate packet */
 236                 if (!info->rx_skb) {
 237                         info->rx_state = RECV_WAIT_PACKET_TYPE;
 238                         info->rx_count = 0;
 239                         info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
 240                         if (!info->rx_skb) {
 241                                 BT_ERR("Can't allocate mem for new packet");
 242                                 return;
 243                         }
 244                 }
 245
 246
 247                 if (info->rx_state == RECV_WAIT_PACKET_TYPE) {
 248
 249                         hci_skb_pkt_type(info->rx_skb) = inb(iobase + DATA_L);
 250                         inb(iobase + DATA_H);
 251
 252                         switch (hci_skb_pkt_type(info->rx_skb)) {
 253
 254                         case HCI_EVENT_PKT:
 255                                 info->rx_state = RECV_WAIT_EVENT_HEADER;
 256                                 info->rx_count = HCI_EVENT_HDR_SIZE;
 257                                 break;
 258
 259                         case HCI_ACLDATA_PKT:
 260                                 info->rx_state = RECV_WAIT_ACL_HEADER;
 261                                 info->rx_count = HCI_ACL_HDR_SIZE;
 262                                 break;
 263
 264                         case HCI_SCODATA_PKT:
 265                                 info->rx_state = RECV_WAIT_SCO_HEADER;
 266                                 info->rx_count = HCI_SCO_HDR_SIZE;
 267                                 break;
 268
 269                         default:
 270                                 /* Unknown packet */
 271                                 BT_ERR("Unknown HCI packet with type 0x%02x received",
 272                                        hci_skb_pkt_type(info->rx_skb));
 273                                 info->hdev->stat.err_rx++;
 274
 275                                 kfree_skb(info->rx_skb);
 276                                 info->rx_skb = NULL;
 277                                 break;
 278
 279                         }
 280
 281                 } else {
 282
 283                         __u8 x = inb(iobase + DATA_L);
 284
 285                         skb_put_u8(info->rx_skb, x);
 286                         inb(iobase + DATA_H);
 287                         info->rx_count--;
 288
 289                         if (info->rx_count == 0) {
 290
 291                                 int dlen;
 292                                 struct hci_event_hdr *eh;
 293                                 struct hci_acl_hdr *ah;
 294                                 struct hci_sco_hdr *sh;
 295
 296                                 switch (info->rx_state) {
 297
 298                                 case RECV_WAIT_EVENT_HEADER:
 299                                         eh = hci_event_hdr(info->rx_skb);
 300                                         info->rx_state = RECV_WAIT_DATA;
 301                                         info->rx_count = eh->plen;
 302                                         break;
 303
 304                                 case RECV_WAIT_ACL_HEADER:
 305                                         ah = hci_acl_hdr(info->rx_skb);
 306                                         dlen = __le16_to_cpu(ah->dlen);
 307                                         info->rx_state = RECV_WAIT_DATA;
 308                                         info->rx_count = dlen;
 309                                         break;
 310
 311                                 case RECV_WAIT_SCO_HEADER:
 312                                         sh = hci_sco_hdr(info->rx_skb);
 313                                         info->rx_state = RECV_WAIT_DATA;
 314                                         info->rx_count = sh->dlen;
 315                                         break;
 316
 317                                 case RECV_WAIT_DATA:
 318                                         hci_recv_frame(info->hdev, info->rx_skb);
 319                                         info->rx_skb = NULL;
 320                                         break;
 321
 322                                 }
 323
 324                         }
 325
 326                 }
 327
 328         }
 329
 330         bt3c_io_write(iobase, 0x7006, 0x0000);
 331 }
 332
 333
 334 static irqreturn_t bt3c_interrupt(int irq, void *dev_inst)
 335 {
 336         struct bt3c_info *info = dev_inst;
 337         unsigned int iobase;
 338         int iir;
 339         irqreturn_t r = IRQ_NONE;
 340
 341         if (!info || !info->hdev)
 342                 /* our irq handler is shared */
 343                 return IRQ_NONE;
 344
 345         iobase = info->p_dev->resource[0]->start;
 346
 347         spin_lock(&(info->lock));
 348
 349         iir = inb(iobase + CONTROL);
 350         if (iir & 0x80) {
 351                 int stat = bt3c_read(iobase, 0x7001);
 352
 353                 if ((stat & 0xff) == 0x7f) {
 354                         BT_ERR("Very strange (stat=0x%04x)", stat);
 355                 } else if ((stat & 0xff) != 0xff) {
 356                         if (stat & 0x0020) {
 357                                 int status = bt3c_read(iobase, 0x7002) & 0x10;
 358                                 bt_dev_info(info->hdev, "Antenna %s",
 359                                                         status ? "out" : "in");
 360                         }
 361                         if (stat & 0x0001)
 362                                 bt3c_receive(info);
 363                         if (stat & 0x0002) {
 364                                 clear_bit(XMIT_SENDING, &(info->tx_state));
 365                                 bt3c_write_wakeup(info);
 366                         }
 367
 368                         bt3c_io_write(iobase, 0x7001, 0x0000);
 369
 370                         outb(iir, iobase + CONTROL);
 371                 }
 372                 r = IRQ_HANDLED;
 373         }
 374
 375         spin_unlock(&(info->lock));
 376
 377         return r;
 378 }
 379
 380
 381
 382 /* ======================== HCI interface ======================== */
 383
 384
 385 static int bt3c_hci_flush(struct hci_dev *hdev)
 386 {
 387         struct bt3c_info *info = hci_get_drvdata(hdev);
 388
 389         /* Drop TX queue */
 390         skb_queue_purge(&(info->txq));
 391
 392         return 0;
 393 }
 394
 395
 396 static int bt3c_hci_open(struct hci_dev *hdev)
 397 {
 398         return 0;
 399 }
 400
 401
 402 static int bt3c_hci_close(struct hci_dev *hdev)
 403 {
 404         bt3c_hci_flush(hdev);
 405
 406         return 0;
 407 }
 408
 409
 410 static int bt3c_hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 411 {
 412         struct bt3c_info *info = hci_get_drvdata(hdev);
 413         unsigned long flags;
 414
 415         switch (hci_skb_pkt_type(skb)) {
 416         case HCI_COMMAND_PKT:
 417                 hdev->stat.cmd_tx++;
 418                 break;
 419         case HCI_ACLDATA_PKT:
 420                 hdev->stat.acl_tx++;
 421                 break;
 422         case HCI_SCODATA_PKT:
 423                 hdev->stat.sco_tx++;
 424                 break;
 425         }
 426
 427         /* Prepend skb with frame type */
 428         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 429         skb_queue_tail(&(info->txq), skb);
 430
 431         spin_lock_irqsave(&(info->lock), flags);
 432
 433         bt3c_write_wakeup(info);
 434
 435         spin_unlock_irqrestore(&(info->lock), flags);
 436
 437         return 0;
 438 }
 439
 440
 441
 442 /* ======================== Card services HCI interaction ======================== */
 443
 444
 445 static int bt3c_load_firmware(struct bt3c_info *info,
 446                               const unsigned char *firmware,
 447                               int count)
 448 {
 449         char *ptr = (char *) firmware;
 450         char b[9];
 451         unsigned int iobase, tmp, tn;
 452         unsigned long size, addr, fcs;
 453         int i, err = 0;
 454
 455         iobase = info->p_dev->resource[0]->start;
 456
 457         /* Reset */
 458         bt3c_io_write(iobase, 0x8040, 0x0404);
 459         bt3c_io_write(iobase, 0x8040, 0x0400);
 460
 461         udelay(1);
 462
 463         bt3c_io_write(iobase, 0x8040, 0x0404);
 464
 465         udelay(17);
 466
 467         /* Load */
 468         while (count) {
 469                 if (ptr[0] != 'S') {
 470                         BT_ERR("Bad address in firmware");
 471                         err = -EFAULT;
 472                         goto error;
 473                 }
 474
 475                 memset(b, 0, sizeof(b));
 476                 memcpy(b, ptr + 2, 2);
 477                 if (kstrtoul(b, 16, &size) < 0)
 478                         return -EINVAL;
 479
 480                 memset(b, 0, sizeof(b));
 481                 memcpy(b, ptr + 4, 8);
 482                 if (kstrtoul(b, 16, &addr) < 0)
 483                         return -EINVAL;
 484
 485                 memset(b, 0, sizeof(b));
 486                 memcpy(b, ptr + (size * 2) + 2, 2);
 487                 if (kstrtoul(b, 16, &fcs) < 0)
 488                         return -EINVAL;
 489
 490                 memset(b, 0, sizeof(b));
 491                 for (tmp = 0, i = 0; i < size; i++) {
 492                         memcpy(b, ptr + (i * 2) + 2, 2);
 493                         if (kstrtouint(b, 16, &tn))
 494                                 return -EINVAL;
 495                         tmp += tn;
 496                 }
 497
 498                 if (((tmp + fcs) & 0xff) != 0xff) {
 499                         BT_ERR("Checksum error in firmware");
 500                         err = -EILSEQ;
 501                         goto error;
 502                 }
 503
 504                 if (ptr[1] == '3') {
 505                         bt3c_address(iobase, addr);
 506
 507                         memset(b, 0, sizeof(b));
 508                         for (i = 0; i < (size - 4) / 2; i++) {
 509                                 memcpy(b, ptr + (i * 4) + 12, 4);
 510                                 if (kstrtouint(b, 16, &tmp))
 511                                         return -EINVAL;
 512                                 bt3c_put(iobase, tmp);
 513                         }
 514                 }
 515
 516                 ptr   += (size * 2) + 6;
 517                 count -= (size * 2) + 6;
 518         }
 519
 520         udelay(17);
 521
 522         /* Boot */
 523         bt3c_address(iobase, 0x3000);
 524         outb(inb(iobase + CONTROL) | 0x40, iobase + CONTROL);
 525
 526 error:
 527         udelay(17);
 528
 529         /* Clear */
 530         bt3c_io_write(iobase, 0x7006, 0x0000);
 531         bt3c_io_write(iobase, 0x7005, 0x0000);
 532         bt3c_io_write(iobase, 0x7001, 0x0000);
 533
 534         return err;
 535 }
 536
 537
 538 static int bt3c_open(struct bt3c_info *info)
 539 {
 540         const struct firmware *firmware;
 541         struct hci_dev *hdev;
 542         int err;
 543
 544         spin_lock_init(&(info->lock));
 545
 546         skb_queue_head_init(&(info->txq));
 547
 548         info->rx_state = RECV_WAIT_PACKET_TYPE;
 549         info->rx_count = 0;
 550         info->rx_skb = NULL;
 551
 552         /* Initialize HCI device */
 553         hdev = hci_alloc_dev();
 554         if (!hdev) {
 555                 BT_ERR("Can't allocate HCI device");
 556                 return -ENOMEM;
 557         }
 558
 559         info->hdev = hdev;
 560
 561         hdev->bus = HCI_PCCARD;
 562         hci_set_drvdata(hdev, info);
 563         SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
 564
 565         hdev->open  = bt3c_hci_open;
 566         hdev->close = bt3c_hci_close;
 567         hdev->flush = bt3c_hci_flush;
 568         hdev->send  = bt3c_hci_send_frame;
 569
 570         /* Load firmware */
 571         err = request_firmware(&firmware, "BT3CPCC.bin", &info->p_dev->dev);
 572         if (err < 0) {
 573                 BT_ERR("Firmware request failed");
 574                 goto error;
 575         }
 576
 577         err = bt3c_load_firmware(info, firmware->data, firmware->size);
 578
 579         release_firmware(firmware);
 580
 581         if (err < 0) {
 582                 BT_ERR("Firmware loading failed");
 583                 goto error;
 584         }
 585
 586         /* Timeout before it is safe to send the first HCI packet */
 587         msleep(1000);
 588
 589         /* Register HCI device */
 590         err = hci_register_dev(hdev);
 591         if (err < 0) {
 592                 BT_ERR("Can't register HCI device");
 593                 goto error;
 594         }
 595
 596         return 0;
 597
 598 error:
 599         info->hdev = NULL;
 600         hci_free_dev(hdev);
 601         return err;
 602 }
 603
 604
 605 static int bt3c_close(struct bt3c_info *info)
 606 {
 607         struct hci_dev *hdev = info->hdev;
 608
 609         if (!hdev)
 610                 return -ENODEV;
 611
 612         bt3c_hci_close(hdev);
 613
 614         hci_unregister_dev(hdev);
 615         hci_free_dev(hdev);
 616
 617         return 0;
 618 }
 619
 620 static int bt3c_probe(struct pcmcia_device *link)
 621 {
 622         struct bt3c_info *info;
 623
 624         /* Create new info device */
 625         info = devm_kzalloc(&link->dev, sizeof(*info), GFP_KERNEL);
 626         if (!info)
 627                 return -ENOMEM;
 628
 629         info->p_dev = link;
 630         link->priv = info;
 631
 632         link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_VPP |
 633                 CONF_AUTO_SET_IO;
 634
 635         return bt3c_config(link);
 636 }
 637
 638
 639 static void bt3c_detach(struct pcmcia_device *link)
 640 {
 641         bt3c_release(link);
 642 }
 643
 644 static int bt3c_check_config(struct pcmcia_device *p_dev, void *priv_data)
 645 {
 646         int *try = priv_data;
 647
 648         if (!try)
 649                 p_dev->io_lines = 16;
 650
 651         if ((p_dev->resource[0]->end != 8) || (p_dev->resource[0]->start == 0))
 652                 return -EINVAL;
 653
 654         p_dev->resource[0]->end = 8;
 655         p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 656         p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
 657
 658         return pcmcia_request_io(p_dev);
 659 }
 660
 661 static int bt3c_check_config_notpicky(struct pcmcia_device *p_dev,
 662                                       void *priv_data)
 663 {
 664         static unsigned int base[5] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, 0x0 };
 665         int j;
 666
 667         if (p_dev->io_lines > 3)
 668                 return -ENODEV;
 669
 670         p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 671         p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
 672         p_dev->resource[0]->end = 8;
 673
 674         for (j = 0; j < 5; j++) {
 675                 p_dev->resource[0]->start = base[j];
 676                 p_dev->io_lines = base[j] ? 16 : 3;
 677                 if (!pcmcia_request_io(p_dev))
 678                         return 0;
 679         }
 680         return -ENODEV;
 681 }
 682
 683 static int bt3c_config(struct pcmcia_device *link)
 684 {
 685         struct bt3c_info *info = link->priv;
 686         int i;
 687         unsigned long try;
 688
 689         /* First pass: look for a config entry that looks normal.
 690          * Two tries: without IO aliases, then with aliases
 691          */
 692         for (try = 0; try < 2; try++)
 693                 if (!pcmcia_loop_config(link, bt3c_check_config, (void *) try))
 694                         goto found_port;
 695
 696         /* Second pass: try to find an entry that isn't picky about
 697          * its base address, then try to grab any standard serial port
 698          * address, and finally try to get any free port.
 699          */
 700         if (!pcmcia_loop_config(link, bt3c_check_config_notpicky, NULL))
 701                 goto found_port;
 702
 703         BT_ERR("No usable port range found");
 704         goto failed;
 705
 706 found_port:
 707         i = pcmcia_request_irq(link, &bt3c_interrupt);
 708         if (i != 0)
 709                 goto failed;
 710
 711         i = pcmcia_enable_device(link);
 712         if (i != 0)
 713                 goto failed;
 714
 715         if (bt3c_open(info) != 0)
 716                 goto failed;
 717
 718         return 0;
 719
 720 failed:
 721         bt3c_release(link);
 722         return -ENODEV;
 723 }
 724
 725
 726 static void bt3c_release(struct pcmcia_device *link)
 727 {
 728         struct bt3c_info *info = link->priv;
 729
 730         bt3c_close(info);
 731
 732         pcmcia_disable_device(link);
 733 }
 734
 735
 736 static const struct pcmcia_device_id bt3c_ids[] = {
 737         PCMCIA_DEVICE_PROD_ID13("3COM", "Bluetooth PC Card", 0xefce0a31, 0xd4ce9b02),
 738         PCMCIA_DEVICE_NULL
 739 };
 740 MODULE_DEVICE_TABLE(pcmcia, bt3c_ids);
 741
 742 static struct pcmcia_driver bt3c_driver = {
 743         .owner          = THIS_MODULE,
 744         .name           = "bt3c_cs",
 745         .probe          = bt3c_probe,
 746         .remove         = bt3c_detach,
 747         .id_table       = bt3c_ids,
 748 };
 749 module_pcmcia_driver(bt3c_driver);