drivers/bluetooth/hci_ll.c

   1 /*
   2  *  Texas Instruments' Bluetooth HCILL UART protocol
   3  *
   4  *  HCILL (HCI Low Level) is a Texas Instruments' power management
   5  *  protocol extension to H4.
   6  *
   7  *  Copyright (C) 2007 Texas Instruments, Inc.
   8  *
   9  *  Written by Ohad Ben-Cohen <ohad@bencohen.org>
  10  *
  11  *  Acknowledgements:
  12  *  This file is based on hci_h4.c, which was written
  13  *  by Maxim Krasnyansky and Marcel Holtmann.
  14  *
  15  *  This program is free software; you can redistribute it and/or modify
  16  *  it under the terms of the GNU General Public License version 2
  17  *  as published by the Free Software Foundation
  18  *
  19  *  This program is distributed in the hope that it will be useful,
  20  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *  GNU General Public License for more details.
  23  *
  24  *  You should have received a copy of the GNU General Public License
  25  *  along with this program; if not, write to the Free Software
  26  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32
  33 #include <linux/init.h>
  34 #include <linux/sched.h>
  35 #include <linux/types.h>
  36 #include <linux/fcntl.h>
  37 #include <linux/firmware.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/poll.h>
  41
  42 #include <linux/slab.h>
  43 #include <linux/errno.h>
  44 #include <linux/string.h>
  45 #include <linux/signal.h>
  46 #include <linux/ioctl.h>
  47 #include <linux/of.h>
  48 #include <linux/serdev.h>
  49 #include <linux/skbuff.h>
  50 #include <linux/ti_wilink_st.h>
  51 #include <linux/clk.h>
  52
  53 #include <net/bluetooth/bluetooth.h>
  54 #include <net/bluetooth/hci_core.h>
  55 #include <linux/gpio/consumer.h>
  56 #include <linux/nvmem-consumer.h>
  57
  58 #include "hci_uart.h"
  59
  60 /* Vendor-specific HCI commands */
  61 #define HCI_VS_WRITE_BD_ADDR                    0xfc06
  62 #define HCI_VS_UPDATE_UART_HCI_BAUDRATE         0xff36
  63
  64 /* HCILL commands */
  65 #define HCILL_GO_TO_SLEEP_IND   0x30
  66 #define HCILL_GO_TO_SLEEP_ACK   0x31
  67 #define HCILL_WAKE_UP_IND       0x32
  68 #define HCILL_WAKE_UP_ACK       0x33
  69
  70 /* HCILL receiver States */
  71 #define HCILL_W4_PACKET_TYPE    0
  72 #define HCILL_W4_EVENT_HDR      1
  73 #define HCILL_W4_ACL_HDR        2
  74 #define HCILL_W4_SCO_HDR        3
  75 #define HCILL_W4_DATA           4
  76
  77 /* HCILL states */
  78 enum hcill_states_e {
  79         HCILL_ASLEEP,
  80         HCILL_ASLEEP_TO_AWAKE,
  81         HCILL_AWAKE,
  82         HCILL_AWAKE_TO_ASLEEP
  83 };
  84
  85 struct hcill_cmd {
  86         u8 cmd;
  87 } __packed;
  88
  89 struct ll_device {
  90         struct hci_uart hu;
  91         struct serdev_device *serdev;
  92         struct gpio_desc *enable_gpio;
  93         struct clk *ext_clk;
  94         bdaddr_t bdaddr;
  95 };
  96
  97 struct ll_struct {
  98         unsigned long rx_state;
  99         unsigned long rx_count;
 100         struct sk_buff *rx_skb;
 101         struct sk_buff_head txq;
 102         spinlock_t hcill_lock;          /* HCILL state lock     */
 103         unsigned long hcill_state;      /* HCILL power state    */
 104         struct sk_buff_head tx_wait_q;  /* HCILL wait queue     */
 105 };
 106
 107 /*
 108  * Builds and sends an HCILL command packet.
 109  * These are very simple packets with only 1 cmd byte
 110  */
 111 static int send_hcill_cmd(u8 cmd, struct hci_uart *hu)
 112 {
 113         int err = 0;
 114         struct sk_buff *skb = NULL;
 115         struct ll_struct *ll = hu->priv;
 116         struct hcill_cmd *hcill_packet;
 117
 118         BT_DBG("hu %p cmd 0x%x", hu, cmd);
 119
 120         /* allocate packet */
 121         skb = bt_skb_alloc(1, GFP_ATOMIC);
 122         if (!skb) {
 123                 BT_ERR("cannot allocate memory for HCILL packet");
 124                 err = -ENOMEM;
 125                 goto out;
 126         }
 127
 128         /* prepare packet */
 129         hcill_packet = skb_put(skb, 1);
 130         hcill_packet->cmd = cmd;
 131
 132         /* send packet */
 133         skb_queue_tail(&ll->txq, skb);
 134 out:
 135         return err;
 136 }
 137
 138 /* Initialize protocol */
 139 static int ll_open(struct hci_uart *hu)
 140 {
 141         struct ll_struct *ll;
 142
 143         BT_DBG("hu %p", hu);
 144
 145         ll = kzalloc(sizeof(*ll), GFP_KERNEL);
 146         if (!ll)
 147                 return -ENOMEM;
 148
 149         skb_queue_head_init(&ll->txq);
 150         skb_queue_head_init(&ll->tx_wait_q);
 151         spin_lock_init(&ll->hcill_lock);
 152
 153         ll->hcill_state = HCILL_AWAKE;
 154
 155         hu->priv = ll;
 156
 157         if (hu->serdev) {
 158                 struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
 159                 serdev_device_open(hu->serdev);
 160                 if (!IS_ERR(lldev->ext_clk))
 161                         clk_prepare_enable(lldev->ext_clk);
 162         }
 163
 164         return 0;
 165 }
 166
 167 /* Flush protocol data */
 168 static int ll_flush(struct hci_uart *hu)
 169 {
 170         struct ll_struct *ll = hu->priv;
 171
 172         BT_DBG("hu %p", hu);
 173
 174         skb_queue_purge(&ll->tx_wait_q);
 175         skb_queue_purge(&ll->txq);
 176
 177         return 0;
 178 }
 179
 180 /* Close protocol */
 181 static int ll_close(struct hci_uart *hu)
 182 {
 183         struct ll_struct *ll = hu->priv;
 184
 185         BT_DBG("hu %p", hu);
 186
 187         skb_queue_purge(&ll->tx_wait_q);
 188         skb_queue_purge(&ll->txq);
 189
 190         kfree_skb(ll->rx_skb);
 191
 192         if (hu->serdev) {
 193                 struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
 194                 gpiod_set_value_cansleep(lldev->enable_gpio, 0);
 195
 196                 clk_disable_unprepare(lldev->ext_clk);
 197
 198                 serdev_device_close(hu->serdev);
 199         }
 200
 201         hu->priv = NULL;
 202
 203         kfree(ll);
 204
 205         return 0;
 206 }
 207
 208 /*
 209  * internal function, which does common work of the device wake up process:
 210  * 1. places all pending packets (waiting in tx_wait_q list) in txq list.
 211  * 2. changes internal state to HCILL_AWAKE.
 212  * Note: assumes that hcill_lock spinlock is taken,
 213  * shouldn't be called otherwise!
 214  */
 215 static void __ll_do_awake(struct ll_struct *ll)
 216 {
 217         struct sk_buff *skb = NULL;
 218
 219         while ((skb = skb_dequeue(&ll->tx_wait_q)))
 220                 skb_queue_tail(&ll->txq, skb);
 221
 222         ll->hcill_state = HCILL_AWAKE;
 223 }
 224
 225 /*
 226  * Called upon a wake-up-indication from the device
 227  */
 228 static void ll_device_want_to_wakeup(struct hci_uart *hu)
 229 {
 230         unsigned long flags;
 231         struct ll_struct *ll = hu->priv;
 232
 233         BT_DBG("hu %p", hu);
 234
 235         /* lock hcill state */
 236         spin_lock_irqsave(&ll->hcill_lock, flags);
 237
 238         switch (ll->hcill_state) {
 239         case HCILL_ASLEEP_TO_AWAKE:
 240                 /*
 241                  * This state means that both the host and the BRF chip
 242                  * have simultaneously sent a wake-up-indication packet.
 243                  * Traditionally, in this case, receiving a wake-up-indication
 244                  * was enough and an additional wake-up-ack wasn't needed.
 245                  * This has changed with the BRF6350, which does require an
 246                  * explicit wake-up-ack. Other BRF versions, which do not
 247                  * require an explicit ack here, do accept it, thus it is
 248                  * perfectly safe to always send one.
 249                  */
 250                 BT_DBG("dual wake-up-indication");
 251                 /* fall through */
 252         case HCILL_ASLEEP:
 253                 /* acknowledge device wake up */
 254                 if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {
 255                         BT_ERR("cannot acknowledge device wake up");
 256                         goto out;
 257                 }
 258                 break;
 259         default:
 260                 /* any other state is illegal */
 261                 BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state);
 262                 break;
 263         }
 264
 265         /* send pending packets and change state to HCILL_AWAKE */
 266         __ll_do_awake(ll);
 267
 268 out:
 269         spin_unlock_irqrestore(&ll->hcill_lock, flags);
 270
 271         /* actually send the packets */
 272         hci_uart_tx_wakeup(hu);
 273 }
 274
 275 /*
 276  * Called upon a sleep-indication from the device
 277  */
 278 static void ll_device_want_to_sleep(struct hci_uart *hu)
 279 {
 280         unsigned long flags;
 281         struct ll_struct *ll = hu->priv;
 282
 283         BT_DBG("hu %p", hu);
 284
 285         /* lock hcill state */
 286         spin_lock_irqsave(&ll->hcill_lock, flags);
 287
 288         /* sanity check */
 289         if (ll->hcill_state != HCILL_AWAKE)
 290                 BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state);
 291
 292         /* acknowledge device sleep */
 293         if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) {
 294                 BT_ERR("cannot acknowledge device sleep");
 295                 goto out;
 296         }
 297
 298         /* update state */
 299         ll->hcill_state = HCILL_ASLEEP;
 300
 301 out:
 302         spin_unlock_irqrestore(&ll->hcill_lock, flags);
 303
 304         /* actually send the sleep ack packet */
 305         hci_uart_tx_wakeup(hu);
 306 }
 307
 308 /*
 309  * Called upon wake-up-acknowledgement from the device
 310  */
 311 static void ll_device_woke_up(struct hci_uart *hu)
 312 {
 313         unsigned long flags;
 314         struct ll_struct *ll = hu->priv;
 315
 316         BT_DBG("hu %p", hu);
 317
 318         /* lock hcill state */
 319         spin_lock_irqsave(&ll->hcill_lock, flags);
 320
 321         /* sanity check */
 322         if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE)
 323                 BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state);
 324
 325         /* send pending packets and change state to HCILL_AWAKE */
 326         __ll_do_awake(ll);
 327
 328         spin_unlock_irqrestore(&ll->hcill_lock, flags);
 329
 330         /* actually send the packets */
 331         hci_uart_tx_wakeup(hu);
 332 }
 333
 334 /* Enqueue frame for transmittion (padding, crc, etc) */
 335 /* may be called from two simultaneous tasklets */
 336 static int ll_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 337 {
 338         unsigned long flags = 0;
 339         struct ll_struct *ll = hu->priv;
 340
 341         BT_DBG("hu %p skb %p", hu, skb);
 342
 343         /* Prepend skb with frame type */
 344         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 345
 346         /* lock hcill state */
 347         spin_lock_irqsave(&ll->hcill_lock, flags);
 348
 349         /* act according to current state */
 350         switch (ll->hcill_state) {
 351         case HCILL_AWAKE:
 352                 BT_DBG("device awake, sending normally");
 353                 skb_queue_tail(&ll->txq, skb);
 354                 break;
 355         case HCILL_ASLEEP:
 356                 BT_DBG("device asleep, waking up and queueing packet");
 357                 /* save packet for later */
 358                 skb_queue_tail(&ll->tx_wait_q, skb);
 359                 /* awake device */
 360                 if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) {
 361                         BT_ERR("cannot wake up device");
 362                         break;
 363                 }
 364                 ll->hcill_state = HCILL_ASLEEP_TO_AWAKE;
 365                 break;
 366         case HCILL_ASLEEP_TO_AWAKE:
 367                 BT_DBG("device waking up, queueing packet");
 368                 /* transient state; just keep packet for later */
 369                 skb_queue_tail(&ll->tx_wait_q, skb);
 370                 break;
 371         default:
 372                 BT_ERR("illegal hcill state: %ld (losing packet)", ll->hcill_state);
 373                 kfree_skb(skb);
 374                 break;
 375         }
 376
 377         spin_unlock_irqrestore(&ll->hcill_lock, flags);
 378
 379         return 0;
 380 }
 381
 382 static inline int ll_check_data_len(struct hci_dev *hdev, struct ll_struct *ll, int len)
 383 {
 384         int room = skb_tailroom(ll->rx_skb);
 385
 386         BT_DBG("len %d room %d", len, room);
 387
 388         if (!len) {
 389                 hci_recv_frame(hdev, ll->rx_skb);
 390         } else if (len > room) {
 391                 BT_ERR("Data length is too large");
 392                 kfree_skb(ll->rx_skb);
 393         } else {
 394                 ll->rx_state = HCILL_W4_DATA;
 395                 ll->rx_count = len;
 396                 return len;
 397         }
 398
 399         ll->rx_state = HCILL_W4_PACKET_TYPE;
 400         ll->rx_skb   = NULL;
 401         ll->rx_count = 0;
 402
 403         return 0;
 404 }
 405
 406 /* Recv data */
 407 static int ll_recv(struct hci_uart *hu, const void *data, int count)
 408 {
 409         struct ll_struct *ll = hu->priv;
 410         const char *ptr;
 411         struct hci_event_hdr *eh;
 412         struct hci_acl_hdr   *ah;
 413         struct hci_sco_hdr   *sh;
 414         int len, type, dlen;
 415
 416         BT_DBG("hu %p count %d rx_state %ld rx_count %ld", hu, count, ll->rx_state, ll->rx_count);
 417
 418         ptr = data;
 419         while (count) {
 420                 if (ll->rx_count) {
 421                         len = min_t(unsigned int, ll->rx_count, count);
 422                         skb_put_data(ll->rx_skb, ptr, len);
 423                         ll->rx_count -= len; count -= len; ptr += len;
 424
 425                         if (ll->rx_count)
 426                                 continue;
 427
 428                         switch (ll->rx_state) {
 429                         case HCILL_W4_DATA:
 430                                 BT_DBG("Complete data");
 431                                 hci_recv_frame(hu->hdev, ll->rx_skb);
 432
 433                                 ll->rx_state = HCILL_W4_PACKET_TYPE;
 434                                 ll->rx_skb = NULL;
 435                                 continue;
 436
 437                         case HCILL_W4_EVENT_HDR:
 438                                 eh = hci_event_hdr(ll->rx_skb);
 439
 440                                 BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
 441
 442                                 ll_check_data_len(hu->hdev, ll, eh->plen);
 443                                 continue;
 444
 445                         case HCILL_W4_ACL_HDR:
 446                                 ah = hci_acl_hdr(ll->rx_skb);
 447                                 dlen = __le16_to_cpu(ah->dlen);
 448
 449                                 BT_DBG("ACL header: dlen %d", dlen);
 450
 451                                 ll_check_data_len(hu->hdev, ll, dlen);
 452                                 continue;
 453
 454                         case HCILL_W4_SCO_HDR:
 455                                 sh = hci_sco_hdr(ll->rx_skb);
 456
 457                                 BT_DBG("SCO header: dlen %d", sh->dlen);
 458
 459                                 ll_check_data_len(hu->hdev, ll, sh->dlen);
 460                                 continue;
 461                         }
 462                 }
 463
 464                 /* HCILL_W4_PACKET_TYPE */
 465                 switch (*ptr) {
 466                 case HCI_EVENT_PKT:
 467                         BT_DBG("Event packet");
 468                         ll->rx_state = HCILL_W4_EVENT_HDR;
 469                         ll->rx_count = HCI_EVENT_HDR_SIZE;
 470                         type = HCI_EVENT_PKT;
 471                         break;
 472
 473                 case HCI_ACLDATA_PKT:
 474                         BT_DBG("ACL packet");
 475                         ll->rx_state = HCILL_W4_ACL_HDR;
 476                         ll->rx_count = HCI_ACL_HDR_SIZE;
 477                         type = HCI_ACLDATA_PKT;
 478                         break;
 479
 480                 case HCI_SCODATA_PKT:
 481                         BT_DBG("SCO packet");
 482                         ll->rx_state = HCILL_W4_SCO_HDR;
 483                         ll->rx_count = HCI_SCO_HDR_SIZE;
 484                         type = HCI_SCODATA_PKT;
 485                         break;
 486
 487                 /* HCILL signals */
 488                 case HCILL_GO_TO_SLEEP_IND:
 489                         BT_DBG("HCILL_GO_TO_SLEEP_IND packet");
 490                         ll_device_want_to_sleep(hu);
 491                         ptr++; count--;
 492                         continue;
 493
 494                 case HCILL_GO_TO_SLEEP_ACK:
 495                         /* shouldn't happen */
 496                         BT_ERR("received HCILL_GO_TO_SLEEP_ACK (in state %ld)", ll->hcill_state);
 497                         ptr++; count--;
 498                         continue;
 499
 500                 case HCILL_WAKE_UP_IND:
 501                         BT_DBG("HCILL_WAKE_UP_IND packet");
 502                         ll_device_want_to_wakeup(hu);
 503                         ptr++; count--;
 504                         continue;
 505
 506                 case HCILL_WAKE_UP_ACK:
 507                         BT_DBG("HCILL_WAKE_UP_ACK packet");
 508                         ll_device_woke_up(hu);
 509                         ptr++; count--;
 510                         continue;
 511
 512                 default:
 513                         BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
 514                         hu->hdev->stat.err_rx++;
 515                         ptr++; count--;
 516                         continue;
 517                 }
 518
 519                 ptr++; count--;
 520
 521                 /* Allocate packet */
 522                 ll->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
 523                 if (!ll->rx_skb) {
 524                         BT_ERR("Can't allocate mem for new packet");
 525                         ll->rx_state = HCILL_W4_PACKET_TYPE;
 526                         ll->rx_count = 0;
 527                         return -ENOMEM;
 528                 }
 529
 530                 hci_skb_pkt_type(ll->rx_skb) = type;
 531         }
 532
 533         return count;
 534 }
 535
 536 static struct sk_buff *ll_dequeue(struct hci_uart *hu)
 537 {
 538         struct ll_struct *ll = hu->priv;
 539         return skb_dequeue(&ll->txq);
 540 }
 541
 542 #if IS_ENABLED(CONFIG_SERIAL_DEV_BUS)
 543 static int read_local_version(struct hci_dev *hdev)
 544 {
 545         int err = 0;
 546         unsigned short version = 0;
 547         struct sk_buff *skb;
 548         struct hci_rp_read_local_version *ver;
 549
 550         skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, HCI_INIT_TIMEOUT);
 551         if (IS_ERR(skb)) {
 552                 bt_dev_err(hdev, "Reading TI version information failed (%ld)",
 553                            PTR_ERR(skb));
 554                 return PTR_ERR(skb);
 555         }
 556         if (skb->len != sizeof(*ver)) {
 557                 err = -EILSEQ;
 558                 goto out;
 559         }
 560
 561         ver = (struct hci_rp_read_local_version *)skb->data;
 562         if (le16_to_cpu(ver->manufacturer) != 13) {
 563                 err = -ENODEV;
 564                 goto out;
 565         }
 566
 567         version = le16_to_cpu(ver->lmp_subver);
 568
 569 out:
 570         if (err) bt_dev_err(hdev, "Failed to read TI version info: %d", err);
 571         kfree_skb(skb);
 572         return err ? err : version;
 573 }
 574
 575 /**
 576  * download_firmware -
 577  *      internal function which parses through the .bts firmware
 578  *      script file intreprets SEND, DELAY actions only as of now
 579  */
 580 static int download_firmware(struct ll_device *lldev)
 581 {
 582         unsigned short chip, min_ver, maj_ver;
 583         int version, err, len;
 584         unsigned char *ptr, *action_ptr;
 585         unsigned char bts_scr_name[40]; /* 40 char long bts scr name? */
 586         const struct firmware *fw;
 587         struct sk_buff *skb;
 588         struct hci_command *cmd;
 589
 590         version = read_local_version(lldev->hu.hdev);
 591         if (version < 0)
 592                 return version;
 593
 594         chip = (version & 0x7C00) >> 10;
 595         min_ver = (version & 0x007F);
 596         maj_ver = (version & 0x0380) >> 7;
 597         if (version & 0x8000)
 598                 maj_ver |= 0x0008;
 599
 600         snprintf(bts_scr_name, sizeof(bts_scr_name),
 601                  "ti-connectivity/TIInit_%d.%d.%d.bts",
 602                  chip, maj_ver, min_ver);
 603
 604         err = request_firmware(&fw, bts_scr_name, &lldev->serdev->dev);
 605         if (err || !fw->data || !fw->size) {
 606                 bt_dev_err(lldev->hu.hdev, "request_firmware failed(errno %d) for %s",
 607                            err, bts_scr_name);
 608                 return -EINVAL;
 609         }
 610         ptr = (void *)fw->data;
 611         len = fw->size;
 612         /* bts_header to remove out magic number and
 613          * version
 614          */
 615         ptr += sizeof(struct bts_header);
 616         len -= sizeof(struct bts_header);
 617
 618         while (len > 0 && ptr) {
 619                 bt_dev_dbg(lldev->hu.hdev, " action size %d, type %d ",
 620                            ((struct bts_action *)ptr)->size,
 621                            ((struct bts_action *)ptr)->type);
 622
 623                 action_ptr = &(((struct bts_action *)ptr)->data[0]);
 624
 625                 switch (((struct bts_action *)ptr)->type) {
 626                 case ACTION_SEND_COMMAND:       /* action send */
 627                         bt_dev_dbg(lldev->hu.hdev, "S");
 628                         cmd = (struct hci_command *)action_ptr;
 629                         if (cmd->opcode == HCI_VS_UPDATE_UART_HCI_BAUDRATE) {
 630                                 /* ignore remote change
 631                                  * baud rate HCI VS command
 632                                  */
 633                                 bt_dev_warn(lldev->hu.hdev, "change remote baud rate command in firmware");
 634                                 break;
 635                         }
 636                         if (cmd->prefix != 1)
 637                                 bt_dev_dbg(lldev->hu.hdev, "command type %d", cmd->prefix);
 638
 639                         skb = __hci_cmd_sync(lldev->hu.hdev, cmd->opcode, cmd->plen, &cmd->speed, HCI_INIT_TIMEOUT);
 640                         if (IS_ERR(skb)) {
 641                                 bt_dev_err(lldev->hu.hdev, "send command failed");
 642                                 err = PTR_ERR(skb);
 643                                 goto out_rel_fw;
 644                         }
 645                         kfree_skb(skb);
 646                         break;
 647                 case ACTION_WAIT_EVENT:  /* wait */
 648                         /* no need to wait as command was synchronous */
 649                         bt_dev_dbg(lldev->hu.hdev, "W");
 650                         break;
 651                 case ACTION_DELAY:      /* sleep */
 652                         bt_dev_info(lldev->hu.hdev, "sleep command in scr");
 653                         mdelay(((struct bts_action_delay *)action_ptr)->msec);
 654                         break;
 655                 }
 656                 len -= (sizeof(struct bts_action) +
 657                         ((struct bts_action *)ptr)->size);
 658                 ptr += sizeof(struct bts_action) +
 659                         ((struct bts_action *)ptr)->size;
 660         }
 661
 662 out_rel_fw:
 663         /* fw download complete */
 664         release_firmware(fw);
 665         return err;
 666 }
 667
 668 static int ll_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
 669 {
 670         bdaddr_t bdaddr_swapped;
 671         struct sk_buff *skb;
 672
 673         /* HCI_VS_WRITE_BD_ADDR (at least on a CC2560A chip) expects the BD
 674          * address to be MSB first, but bdaddr_t has the convention of being
 675          * LSB first.
 676          */
 677         baswap(&bdaddr_swapped, bdaddr);
 678         skb = __hci_cmd_sync(hdev, HCI_VS_WRITE_BD_ADDR, sizeof(bdaddr_t),
 679                              &bdaddr_swapped, HCI_INIT_TIMEOUT);
 680         if (!IS_ERR(skb))
 681                 kfree_skb(skb);
 682
 683         return PTR_ERR_OR_ZERO(skb);
 684 }
 685
 686 static int ll_setup(struct hci_uart *hu)
 687 {
 688         int err, retry = 3;
 689         struct ll_device *lldev;
 690         struct serdev_device *serdev = hu->serdev;
 691         u32 speed;
 692
 693         if (!serdev)
 694                 return 0;
 695
 696         lldev = serdev_device_get_drvdata(serdev);
 697
 698         hu->hdev->set_bdaddr = ll_set_bdaddr;
 699
 700         serdev_device_set_flow_control(serdev, true);
 701
 702         do {
 703                 /* Reset the Bluetooth device */
 704                 gpiod_set_value_cansleep(lldev->enable_gpio, 0);
 705                 msleep(5);
 706                 gpiod_set_value_cansleep(lldev->enable_gpio, 1);
 707                 err = serdev_device_wait_for_cts(serdev, true, 200);
 708                 if (err) {
 709                         bt_dev_err(hu->hdev, "Failed to get CTS");
 710                         return err;
 711                 }
 712
 713                 err = download_firmware(lldev);
 714                 if (!err)
 715                         break;
 716
 717                 /* Toggle BT_EN and retry */
 718                 bt_dev_err(hu->hdev, "download firmware failed, retrying...");
 719         } while (retry--);
 720
 721         if (err)
 722                 return err;
 723
 724         /* Set BD address if one was specified at probe */
 725         if (!bacmp(&lldev->bdaddr, BDADDR_NONE)) {
 726                 /* This means that there was an error getting the BD address
 727                  * during probe, so mark the device as having a bad address.
 728                  */
 729                 set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks);
 730         } else if (bacmp(&lldev->bdaddr, BDADDR_ANY)) {
 731                 err = ll_set_bdaddr(hu->hdev, &lldev->bdaddr);
 732                 if (err)
 733                         set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks);
 734         }
 735
 736         /* Operational speed if any */
 737         if (hu->oper_speed)
 738                 speed = hu->oper_speed;
 739         else if (hu->proto->oper_speed)
 740                 speed = hu->proto->oper_speed;
 741         else
 742                 speed = 0;
 743
 744         if (speed) {
 745                 __le32 speed_le = cpu_to_le32(speed);
 746                 struct sk_buff *skb;
 747
 748                 skb = __hci_cmd_sync(hu->hdev, HCI_VS_UPDATE_UART_HCI_BAUDRATE,
 749                                      sizeof(speed_le), &speed_le,
 750                                      HCI_INIT_TIMEOUT);
 751                 if (!IS_ERR(skb)) {
 752                         kfree_skb(skb);
 753                         serdev_device_set_baudrate(serdev, speed);
 754                 }
 755         }
 756
 757         return 0;
 758 }
 759
 760 static const struct hci_uart_proto llp;
 761
 762 static int hci_ti_probe(struct serdev_device *serdev)
 763 {
 764         struct hci_uart *hu;
 765         struct ll_device *lldev;
 766         struct nvmem_cell *bdaddr_cell;
 767         u32 max_speed = 3000000;
 768
 769         lldev = devm_kzalloc(&serdev->dev, sizeof(struct ll_device), GFP_KERNEL);
 770         if (!lldev)
 771                 return -ENOMEM;
 772         hu = &lldev->hu;
 773
 774         serdev_device_set_drvdata(serdev, lldev);
 775         lldev->serdev = hu->serdev = serdev;
 776
 777         lldev->enable_gpio = devm_gpiod_get_optional(&serdev->dev, "enable", GPIOD_OUT_LOW);
 778         if (IS_ERR(lldev->enable_gpio))
 779                 return PTR_ERR(lldev->enable_gpio);
 780
 781         lldev->ext_clk = devm_clk_get(&serdev->dev, "ext_clock");
 782         if (IS_ERR(lldev->ext_clk) && PTR_ERR(lldev->ext_clk) != -ENOENT)
 783                 return PTR_ERR(lldev->ext_clk);
 784
 785         of_property_read_u32(serdev->dev.of_node, "max-speed", &max_speed);
 786         hci_uart_set_speeds(hu, 115200, max_speed);
 787
 788         /* optional BD address from nvram */
 789         bdaddr_cell = nvmem_cell_get(&serdev->dev, "bd-address");
 790         if (IS_ERR(bdaddr_cell)) {
 791                 int err = PTR_ERR(bdaddr_cell);
 792
 793                 if (err == -EPROBE_DEFER)
 794                         return err;
 795
 796                 /* ENOENT means there is no matching nvmem cell and ENOSYS
 797                  * means that nvmem is not enabled in the kernel configuration.
 798                  */
 799                 if (err != -ENOENT && err != -ENOSYS) {
 800                         /* If there was some other error, give userspace a
 801                          * chance to fix the problem instead of failing to load
 802                          * the driver. Using BDADDR_NONE as a flag that is
 803                          * tested later in the setup function.
 804                          */
 805                         dev_warn(&serdev->dev,
 806                                  "Failed to get \"bd-address\" nvmem cell (%d)\n",
 807                                  err);
 808                         bacpy(&lldev->bdaddr, BDADDR_NONE);
 809                 }
 810         } else {
 811                 bdaddr_t *bdaddr;
 812                 size_t len;
 813
 814                 bdaddr = nvmem_cell_read(bdaddr_cell, &len);
 815                 nvmem_cell_put(bdaddr_cell);
 816                 if (IS_ERR(bdaddr)) {
 817                         dev_err(&serdev->dev, "Failed to read nvmem bd-address\n");
 818                         return PTR_ERR(bdaddr);
 819                 }
 820                 if (len != sizeof(bdaddr_t)) {
 821                         dev_err(&serdev->dev, "Invalid nvmem bd-address length\n");
 822                         kfree(bdaddr);
 823                         return -EINVAL;
 824                 }
 825
 826                 /* As per the device tree bindings, the value from nvmem is
 827                  * expected to be MSB first, but in the kernel it is expected
 828                  * that bdaddr_t is LSB first.
 829                  */
 830                 baswap(&lldev->bdaddr, bdaddr);
 831                 kfree(bdaddr);
 832         }
 833
 834         return hci_uart_register_device(hu, &llp);
 835 }
 836
 837 static void hci_ti_remove(struct serdev_device *serdev)
 838 {
 839         struct ll_device *lldev = serdev_device_get_drvdata(serdev);
 840
 841         hci_uart_unregister_device(&lldev->hu);
 842 }
 843
 844 static const struct of_device_id hci_ti_of_match[] = {
 845         { .compatible = "ti,cc2560" },
 846         { .compatible = "ti,wl1271-st" },
 847         { .compatible = "ti,wl1273-st" },
 848         { .compatible = "ti,wl1281-st" },
 849         { .compatible = "ti,wl1283-st" },
 850         { .compatible = "ti,wl1285-st" },
 851         { .compatible = "ti,wl1801-st" },
 852         { .compatible = "ti,wl1805-st" },
 853         { .compatible = "ti,wl1807-st" },
 854         { .compatible = "ti,wl1831-st" },
 855         { .compatible = "ti,wl1835-st" },
 856         { .compatible = "ti,wl1837-st" },
 857         {},
 858 };
 859 MODULE_DEVICE_TABLE(of, hci_ti_of_match);
 860
 861 static struct serdev_device_driver hci_ti_drv = {
 862         .driver         = {
 863                 .name   = "hci-ti",
 864                 .of_match_table = of_match_ptr(hci_ti_of_match),
 865         },
 866         .probe  = hci_ti_probe,
 867         .remove = hci_ti_remove,
 868 };
 869 #else
 870 #define ll_setup NULL
 871 #endif
 872
 873 static const struct hci_uart_proto llp = {
 874         .id             = HCI_UART_LL,
 875         .name           = "LL",
 876         .setup          = ll_setup,
 877         .open           = ll_open,
 878         .close          = ll_close,
 879         .recv           = ll_recv,
 880         .enqueue        = ll_enqueue,
 881         .dequeue        = ll_dequeue,
 882         .flush          = ll_flush,
 883 };
 884
 885 int __init ll_init(void)
 886 {
 887         serdev_device_driver_register(&hci_ti_drv);
 888
 889         return hci_uart_register_proto(&llp);
 890 }
 891
 892 int __exit ll_deinit(void)
 893 {
 894         serdev_device_driver_unregister(&hci_ti_drv);
 895
 896         return hci_uart_unregister_proto(&llp);
 897 }