drivers/bluetooth/btmtkuart.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2018 MediaTek Inc.
   3
   4 /*
   5  * Bluetooth support for MediaTek serial devices
   6  *
   7  * Author: Sean Wang <sean.wang@mediatek.com>
   8  *
   9  */
  10
  11 #include <asm/unaligned.h>
  12 #include <linux/atomic.h>
  13 #include <linux/clk.h>
  14 #include <linux/firmware.h>
  15 #include <linux/gpio/consumer.h>
  16 #include <linux/iopoll.h>
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/of_device.h>
  21 #include <linux/pinctrl/consumer.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <linux/serdev.h>
  25 #include <linux/skbuff.h>
  26
  27 #include <net/bluetooth/bluetooth.h>
  28 #include <net/bluetooth/hci_core.h>
  29
  30 #include "h4_recv.h"
  31
  32 #define VERSION "0.2"
  33
  34 #define FIRMWARE_MT7622         "mediatek/mt7622pr2h.bin"
  35 #define FIRMWARE_MT7663         "mediatek/mt7663pr2h.bin"
  36 #define FIRMWARE_MT7668         "mediatek/mt7668pr2h.bin"
  37
  38 #define MTK_STP_TLR_SIZE        2
  39
  40 #define BTMTKUART_TX_STATE_ACTIVE       1
  41 #define BTMTKUART_TX_STATE_WAKEUP       2
  42 #define BTMTKUART_TX_WAIT_VND_EVT       3
  43 #define BTMTKUART_REQUIRED_WAKEUP       4
  44
  45 #define BTMTKUART_FLAG_STANDALONE_HW     BIT(0)
  46
  47 enum {
  48         MTK_WMT_PATCH_DWNLD = 0x1,
  49         MTK_WMT_TEST = 0x2,
  50         MTK_WMT_WAKEUP = 0x3,
  51         MTK_WMT_HIF = 0x4,
  52         MTK_WMT_FUNC_CTRL = 0x6,
  53         MTK_WMT_RST = 0x7,
  54         MTK_WMT_SEMAPHORE = 0x17,
  55 };
  56
  57 enum {
  58         BTMTK_WMT_INVALID,
  59         BTMTK_WMT_PATCH_UNDONE,
  60         BTMTK_WMT_PATCH_DONE,
  61         BTMTK_WMT_ON_UNDONE,
  62         BTMTK_WMT_ON_DONE,
  63         BTMTK_WMT_ON_PROGRESS,
  64 };
  65
  66 struct mtk_stp_hdr {
  67         u8      prefix;
  68         __be16  dlen;
  69         u8      cs;
  70 } __packed;
  71
  72 struct btmtkuart_data {
  73         unsigned int flags;
  74         const char *fwname;
  75 };
  76
  77 struct mtk_wmt_hdr {
  78         u8      dir;
  79         u8      op;
  80         __le16  dlen;
  81         u8      flag;
  82 } __packed;
  83
  84 struct mtk_hci_wmt_cmd {
  85         struct mtk_wmt_hdr hdr;
  86         u8 data[256];
  87 } __packed;
  88
  89 struct btmtk_hci_wmt_evt {
  90         struct hci_event_hdr hhdr;
  91         struct mtk_wmt_hdr whdr;
  92 } __packed;
  93
  94 struct btmtk_hci_wmt_evt_funcc {
  95         struct btmtk_hci_wmt_evt hwhdr;
  96         __be16 status;
  97 } __packed;
  98
  99 struct btmtk_tci_sleep {
 100         u8 mode;
 101         __le16 duration;
 102         __le16 host_duration;
 103         u8 host_wakeup_pin;
 104         u8 time_compensation;
 105 } __packed;
 106
 107 struct btmtk_hci_wmt_params {
 108         u8 op;
 109         u8 flag;
 110         u16 dlen;
 111         const void *data;
 112         u32 *status;
 113 };
 114
 115 struct btmtkuart_dev {
 116         struct hci_dev *hdev;
 117         struct serdev_device *serdev;
 118
 119         struct clk *clk;
 120         struct clk *osc;
 121         struct regulator *vcc;
 122         struct gpio_desc *reset;
 123         struct gpio_desc *boot;
 124         struct pinctrl *pinctrl;
 125         struct pinctrl_state *pins_runtime;
 126         struct pinctrl_state *pins_boot;
 127         speed_t desired_speed;
 128         speed_t curr_speed;
 129
 130         struct work_struct tx_work;
 131         unsigned long tx_state;
 132         struct sk_buff_head txq;
 133
 134         struct sk_buff *rx_skb;
 135         struct sk_buff *evt_skb;
 136
 137         u8      stp_pad[6];
 138         u8      stp_cursor;
 139         u16     stp_dlen;
 140
 141         const struct btmtkuart_data *data;
 142 };
 143
 144 #define btmtkuart_is_standalone(bdev)   \
 145         ((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW)
 146 #define btmtkuart_is_builtin_soc(bdev)  \
 147         !((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW)
 148
 149 static int mtk_hci_wmt_sync(struct hci_dev *hdev,
 150                             struct btmtk_hci_wmt_params *wmt_params)
 151 {
 152         struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
 153         struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc;
 154         u32 hlen, status = BTMTK_WMT_INVALID;
 155         struct btmtk_hci_wmt_evt *wmt_evt;
 156         struct mtk_hci_wmt_cmd wc;
 157         struct mtk_wmt_hdr *hdr;
 158         int err;
 159
 160         hlen = sizeof(*hdr) + wmt_params->dlen;
 161         if (hlen > 255)
 162                 return -EINVAL;
 163
 164         hdr = (struct mtk_wmt_hdr *)&wc;
 165         hdr->dir = 1;
 166         hdr->op = wmt_params->op;
 167         hdr->dlen = cpu_to_le16(wmt_params->dlen + 1);
 168         hdr->flag = wmt_params->flag;
 169         memcpy(wc.data, wmt_params->data, wmt_params->dlen);
 170
 171         set_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
 172
 173         err = __hci_cmd_send(hdev, 0xfc6f, hlen, &wc);
 174         if (err < 0) {
 175                 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
 176                 return err;
 177         }
 178
 179         /* The vendor specific WMT commands are all answered by a vendor
 180          * specific event and will not have the Command Status or Command
 181          * Complete as with usual HCI command flow control.
 182          *
 183          * After sending the command, wait for BTMTKUART_TX_WAIT_VND_EVT
 184          * state to be cleared. The driver specific event receive routine
 185          * will clear that state and with that indicate completion of the
 186          * WMT command.
 187          */
 188         err = wait_on_bit_timeout(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT,
 189                                   TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT);
 190         if (err == -EINTR) {
 191                 bt_dev_err(hdev, "Execution of wmt command interrupted");
 192                 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
 193                 return err;
 194         }
 195
 196         if (err) {
 197                 bt_dev_err(hdev, "Execution of wmt command timed out");
 198                 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
 199                 return -ETIMEDOUT;
 200         }
 201
 202         /* Parse and handle the return WMT event */
 203         wmt_evt = (struct btmtk_hci_wmt_evt *)bdev->evt_skb->data;
 204         if (wmt_evt->whdr.op != hdr->op) {
 205                 bt_dev_err(hdev, "Wrong op received %d expected %d",
 206                            wmt_evt->whdr.op, hdr->op);
 207                 err = -EIO;
 208                 goto err_free_skb;
 209         }
 210
 211         switch (wmt_evt->whdr.op) {
 212         case MTK_WMT_SEMAPHORE:
 213                 if (wmt_evt->whdr.flag == 2)
 214                         status = BTMTK_WMT_PATCH_UNDONE;
 215                 else
 216                         status = BTMTK_WMT_PATCH_DONE;
 217                 break;
 218         case MTK_WMT_FUNC_CTRL:
 219                 wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt;
 220                 if (be16_to_cpu(wmt_evt_funcc->status) == 0x404)
 221                         status = BTMTK_WMT_ON_DONE;
 222                 else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420)
 223                         status = BTMTK_WMT_ON_PROGRESS;
 224                 else
 225                         status = BTMTK_WMT_ON_UNDONE;
 226                 break;
 227         }
 228
 229         if (wmt_params->status)
 230                 *wmt_params->status = status;
 231
 232 err_free_skb:
 233         kfree_skb(bdev->evt_skb);
 234         bdev->evt_skb = NULL;
 235
 236         return err;
 237 }
 238
 239 static int mtk_setup_firmware(struct hci_dev *hdev, const char *fwname)
 240 {
 241         struct btmtk_hci_wmt_params wmt_params;
 242         const struct firmware *fw;
 243         const u8 *fw_ptr;
 244         size_t fw_size;
 245         int err, dlen;
 246         u8 flag;
 247
 248         err = request_firmware(&fw, fwname, &hdev->dev);
 249         if (err < 0) {
 250                 bt_dev_err(hdev, "Failed to load firmware file (%d)", err);
 251                 return err;
 252         }
 253
 254         fw_ptr = fw->data;
 255         fw_size = fw->size;
 256
 257         /* The size of patch header is 30 bytes, should be skip */
 258         if (fw_size < 30) {
 259                 err = -EINVAL;
 260                 goto free_fw;
 261         }
 262
 263         fw_size -= 30;
 264         fw_ptr += 30;
 265         flag = 1;
 266
 267         wmt_params.op = MTK_WMT_PATCH_DWNLD;
 268         wmt_params.status = NULL;
 269
 270         while (fw_size > 0) {
 271                 dlen = min_t(int, 250, fw_size);
 272
 273                 /* Tell device the position in sequence */
 274                 if (fw_size - dlen <= 0)
 275                         flag = 3;
 276                 else if (fw_size < fw->size - 30)
 277                         flag = 2;
 278
 279                 wmt_params.flag = flag;
 280                 wmt_params.dlen = dlen;
 281                 wmt_params.data = fw_ptr;
 282
 283                 err = mtk_hci_wmt_sync(hdev, &wmt_params);
 284                 if (err < 0) {
 285                         bt_dev_err(hdev, "Failed to send wmt patch dwnld (%d)",
 286                                    err);
 287                         goto free_fw;
 288                 }
 289
 290                 fw_size -= dlen;
 291                 fw_ptr += dlen;
 292         }
 293
 294         wmt_params.op = MTK_WMT_RST;
 295         wmt_params.flag = 4;
 296         wmt_params.dlen = 0;
 297         wmt_params.data = NULL;
 298         wmt_params.status = NULL;
 299
 300         /* Activate funciton the firmware providing to */
 301         err = mtk_hci_wmt_sync(hdev, &wmt_params);
 302         if (err < 0) {
 303                 bt_dev_err(hdev, "Failed to send wmt rst (%d)", err);
 304                 goto free_fw;
 305         }
 306
 307         /* Wait a few moments for firmware activation done */
 308         usleep_range(10000, 12000);
 309
 310 free_fw:
 311         release_firmware(fw);
 312         return err;
 313 }
 314
 315 static int btmtkuart_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
 316 {
 317         struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
 318         struct hci_event_hdr *hdr = (void *)skb->data;
 319         int err;
 320
 321         /* Fix up the vendor event id with 0xff for vendor specific instead
 322          * of 0xe4 so that event send via monitoring socket can be parsed
 323          * properly.
 324          */
 325         if (hdr->evt == 0xe4)
 326                 hdr->evt = HCI_EV_VENDOR;
 327
 328         /* When someone waits for the WMT event, the skb is being cloned
 329          * and being processed the events from there then.
 330          */
 331         if (test_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state)) {
 332                 bdev->evt_skb = skb_clone(skb, GFP_KERNEL);
 333                 if (!bdev->evt_skb) {
 334                         err = -ENOMEM;
 335                         goto err_out;
 336                 }
 337         }
 338
 339         err = hci_recv_frame(hdev, skb);
 340         if (err < 0)
 341                 goto err_free_skb;
 342
 343         if (hdr->evt == HCI_EV_VENDOR) {
 344                 if (test_and_clear_bit(BTMTKUART_TX_WAIT_VND_EVT,
 345                                        &bdev->tx_state)) {
 346                         /* Barrier to sync with other CPUs */
 347                         smp_mb__after_atomic();
 348                         wake_up_bit(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT);
 349                 }
 350         }
 351
 352         return 0;
 353
 354 err_free_skb:
 355         kfree_skb(bdev->evt_skb);
 356         bdev->evt_skb = NULL;
 357
 358 err_out:
 359         return err;
 360 }
 361
 362 static const struct h4_recv_pkt mtk_recv_pkts[] = {
 363         { H4_RECV_ACL,      .recv = hci_recv_frame },
 364         { H4_RECV_SCO,      .recv = hci_recv_frame },
 365         { H4_RECV_EVENT,    .recv = btmtkuart_recv_event },
 366 };
 367
 368 static void btmtkuart_tx_work(struct work_struct *work)
 369 {
 370         struct btmtkuart_dev *bdev = container_of(work, struct btmtkuart_dev,
 371                                                    tx_work);
 372         struct serdev_device *serdev = bdev->serdev;
 373         struct hci_dev *hdev = bdev->hdev;
 374
 375         while (1) {
 376                 clear_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
 377
 378                 while (1) {
 379                         struct sk_buff *skb = skb_dequeue(&bdev->txq);
 380                         int len;
 381
 382                         if (!skb)
 383                                 break;
 384
 385                         len = serdev_device_write_buf(serdev, skb->data,
 386                                                       skb->len);
 387                         hdev->stat.byte_tx += len;
 388
 389                         skb_pull(skb, len);
 390                         if (skb->len > 0) {
 391                                 skb_queue_head(&bdev->txq, skb);
 392                                 break;
 393                         }
 394
 395                         switch (hci_skb_pkt_type(skb)) {
 396                         case HCI_COMMAND_PKT:
 397                                 hdev->stat.cmd_tx++;
 398                                 break;
 399                         case HCI_ACLDATA_PKT:
 400                                 hdev->stat.acl_tx++;
 401                                 break;
 402                         case HCI_SCODATA_PKT:
 403                                 hdev->stat.sco_tx++;
 404                                 break;
 405                         }
 406
 407                         kfree_skb(skb);
 408                 }
 409
 410                 if (!test_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state))
 411                         break;
 412         }
 413
 414         clear_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state);
 415 }
 416
 417 static void btmtkuart_tx_wakeup(struct btmtkuart_dev *bdev)
 418 {
 419         if (test_and_set_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state))
 420                 set_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
 421
 422         schedule_work(&bdev->tx_work);
 423 }
 424
 425 static const unsigned char *
 426 mtk_stp_split(struct btmtkuart_dev *bdev, const unsigned char *data, int count,
 427               int *sz_h4)
 428 {
 429         struct mtk_stp_hdr *shdr;
 430
 431         /* The cursor is reset when all the data of STP is consumed out */
 432         if (!bdev->stp_dlen && bdev->stp_cursor >= 6)
 433                 bdev->stp_cursor = 0;
 434
 435         /* Filling pad until all STP info is obtained */
 436         while (bdev->stp_cursor < 6 && count > 0) {
 437                 bdev->stp_pad[bdev->stp_cursor] = *data;
 438                 bdev->stp_cursor++;
 439                 data++;
 440                 count--;
 441         }
 442
 443         /* Retrieve STP info and have a sanity check */
 444         if (!bdev->stp_dlen && bdev->stp_cursor >= 6) {
 445                 shdr = (struct mtk_stp_hdr *)&bdev->stp_pad[2];
 446                 bdev->stp_dlen = be16_to_cpu(shdr->dlen) & 0x0fff;
 447
 448                 /* Resync STP when unexpected data is being read */
 449                 if (shdr->prefix != 0x80 || bdev->stp_dlen > 2048) {
 450                         bt_dev_err(bdev->hdev, "stp format unexpect (%d, %d)",
 451                                    shdr->prefix, bdev->stp_dlen);
 452                         bdev->stp_cursor = 2;
 453                         bdev->stp_dlen = 0;
 454                 }
 455         }
 456
 457         /* Directly quit when there's no data found for H4 can process */
 458         if (count <= 0)
 459                 return NULL;
 460
 461         /* Tranlate to how much the size of data H4 can handle so far */
 462         *sz_h4 = min_t(int, count, bdev->stp_dlen);
 463
 464         /* Update the remaining size of STP packet */
 465         bdev->stp_dlen -= *sz_h4;
 466
 467         /* Data points to STP payload which can be handled by H4 */
 468         return data;
 469 }
 470
 471 static int btmtkuart_recv(struct hci_dev *hdev, const u8 *data, size_t count)
 472 {
 473         struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
 474         const unsigned char *p_left = data, *p_h4;
 475         int sz_left = count, sz_h4, adv;
 476         int err;
 477
 478         while (sz_left > 0) {
 479                 /*  The serial data received from MT7622 BT controller is
 480                  *  at all time padded around with the STP header and tailer.
 481                  *
 482                  *  A full STP packet is looking like
 483                  *   -----------------------------------
 484                  *  | STP header  |  H:4   | STP tailer |
 485                  *   -----------------------------------
 486                  *  but it doesn't guarantee to contain a full H:4 packet which
 487                  *  means that it's possible for multiple STP packets forms a
 488                  *  full H:4 packet that means extra STP header + length doesn't
 489                  *  indicate a full H:4 frame, things can fragment. Whose length
 490                  *  recorded in STP header just shows up the most length the
 491                  *  H:4 engine can handle currently.
 492                  */
 493
 494                 p_h4 = mtk_stp_split(bdev, p_left, sz_left, &sz_h4);
 495                 if (!p_h4)
 496                         break;
 497
 498                 adv = p_h4 - p_left;
 499                 sz_left -= adv;
 500                 p_left += adv;
 501
 502                 bdev->rx_skb = h4_recv_buf(bdev->hdev, bdev->rx_skb, p_h4,
 503                                            sz_h4, mtk_recv_pkts,
 504                                            ARRAY_SIZE(mtk_recv_pkts));
 505                 if (IS_ERR(bdev->rx_skb)) {
 506                         err = PTR_ERR(bdev->rx_skb);
 507                         bt_dev_err(bdev->hdev,
 508                                    "Frame reassembly failed (%d)", err);
 509                         bdev->rx_skb = NULL;
 510                         return err;
 511                 }
 512
 513                 sz_left -= sz_h4;
 514                 p_left += sz_h4;
 515         }
 516
 517         return 0;
 518 }
 519
 520 static int btmtkuart_receive_buf(struct serdev_device *serdev, const u8 *data,
 521                                  size_t count)
 522 {
 523         struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
 524         int err;
 525
 526         err = btmtkuart_recv(bdev->hdev, data, count);
 527         if (err < 0)
 528                 return err;
 529
 530         bdev->hdev->stat.byte_rx += count;
 531
 532         return count;
 533 }
 534
 535 static void btmtkuart_write_wakeup(struct serdev_device *serdev)
 536 {
 537         struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
 538
 539         btmtkuart_tx_wakeup(bdev);
 540 }
 541
 542 static const struct serdev_device_ops btmtkuart_client_ops = {
 543         .receive_buf = btmtkuart_receive_buf,
 544         .write_wakeup = btmtkuart_write_wakeup,
 545 };
 546
 547 static int btmtkuart_open(struct hci_dev *hdev)
 548 {
 549         struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
 550         struct device *dev;
 551         int err;
 552
 553         err = serdev_device_open(bdev->serdev);
 554         if (err) {
 555                 bt_dev_err(hdev, "Unable to open UART device %s",
 556                            dev_name(&bdev->serdev->dev));
 557                 goto err_open;
 558         }
 559
 560         if (btmtkuart_is_standalone(bdev)) {
 561                 if (bdev->curr_speed != bdev->desired_speed)
 562                         err = serdev_device_set_baudrate(bdev->serdev,
 563                                                          115200);
 564                 else
 565                         err = serdev_device_set_baudrate(bdev->serdev,
 566                                                          bdev->desired_speed);
 567
 568                 if (err < 0) {
 569                         bt_dev_err(hdev, "Unable to set baudrate UART device %s",
 570                                    dev_name(&bdev->serdev->dev));
 571                         goto  err_serdev_close;
 572                 }
 573
 574                 serdev_device_set_flow_control(bdev->serdev, false);
 575         }
 576
 577         bdev->stp_cursor = 2;
 578         bdev->stp_dlen = 0;
 579
 580         dev = &bdev->serdev->dev;
 581
 582         /* Enable the power domain and clock the device requires */
 583         pm_runtime_enable(dev);
 584         err = pm_runtime_get_sync(dev);
 585         if (err < 0) {
 586                 pm_runtime_put_noidle(dev);
 587                 goto err_disable_rpm;
 588         }
 589
 590         err = clk_prepare_enable(bdev->clk);
 591         if (err < 0)
 592                 goto err_put_rpm;
 593
 594         return 0;
 595
 596 err_put_rpm:
 597         pm_runtime_put_sync(dev);
 598 err_disable_rpm:
 599         pm_runtime_disable(dev);
 600 err_serdev_close:
 601         serdev_device_close(bdev->serdev);
 602 err_open:
 603         return err;
 604 }
 605
 606 static int btmtkuart_close(struct hci_dev *hdev)
 607 {
 608         struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
 609         struct device *dev = &bdev->serdev->dev;
 610
 611         /* Shutdown the clock and power domain the device requires */
 612         clk_disable_unprepare(bdev->clk);
 613         pm_runtime_put_sync(dev);
 614         pm_runtime_disable(dev);
 615
 616         serdev_device_close(bdev->serdev);
 617
 618         return 0;
 619 }
 620
 621 static int btmtkuart_flush(struct hci_dev *hdev)
 622 {
 623         struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
 624
 625         /* Flush any pending characters */
 626         serdev_device_write_flush(bdev->serdev);
 627         skb_queue_purge(&bdev->txq);
 628
 629         cancel_work_sync(&bdev->tx_work);
 630
 631         kfree_skb(bdev->rx_skb);
 632         bdev->rx_skb = NULL;
 633
 634         bdev->stp_cursor = 2;
 635         bdev->stp_dlen = 0;
 636
 637         return 0;
 638 }
 639
 640 static int btmtkuart_func_query(struct hci_dev *hdev)
 641 {
 642         struct btmtk_hci_wmt_params wmt_params;
 643         int status, err;
 644         u8 param = 0;
 645
 646         /* Query whether the function is enabled */
 647         wmt_params.op = MTK_WMT_FUNC_CTRL;
 648         wmt_params.flag = 4;
 649         wmt_params.dlen = sizeof(param);
 650         wmt_params.data = &param;
 651         wmt_params.status = &status;
 652
 653         err = mtk_hci_wmt_sync(hdev, &wmt_params);
 654         if (err < 0) {
 655                 bt_dev_err(hdev, "Failed to query function status (%d)", err);
 656                 return err;
 657         }
 658
 659         return status;
 660 }
 661
 662 static int btmtkuart_change_baudrate(struct hci_dev *hdev)
 663 {
 664         struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
 665         struct btmtk_hci_wmt_params wmt_params;
 666         __le32 baudrate;
 667         u8 param;
 668         int err;
 669
 670         /* Indicate the device to enter the probe state the host is
 671          * ready to change a new baudrate.
 672          */
 673         baudrate = cpu_to_le32(bdev->desired_speed);
 674         wmt_params.op = MTK_WMT_HIF;
 675         wmt_params.flag = 1;
 676         wmt_params.dlen = 4;
 677         wmt_params.data = &baudrate;
 678         wmt_params.status = NULL;
 679
 680         err = mtk_hci_wmt_sync(hdev, &wmt_params);
 681         if (err < 0) {
 682                 bt_dev_err(hdev, "Failed to device baudrate (%d)", err);
 683                 return err;
 684         }
 685
 686         err = serdev_device_set_baudrate(bdev->serdev,
 687                                          bdev->desired_speed);
 688         if (err < 0) {
 689                 bt_dev_err(hdev, "Failed to set up host baudrate (%d)",
 690                            err);
 691                 return err;
 692         }
 693
 694         serdev_device_set_flow_control(bdev->serdev, false);
 695
 696         /* Send a dummy byte 0xff to activate the new baudrate */
 697         param = 0xff;
 698         err = serdev_device_write(bdev->serdev, &param, sizeof(param),
 699                                   MAX_SCHEDULE_TIMEOUT);
 700         if (err < 0 || err < sizeof(param))
 701                 return err;
 702
 703         serdev_device_wait_until_sent(bdev->serdev, 0);
 704
 705         /* Wait some time for the device changing baudrate done */
 706         usleep_range(20000, 22000);
 707
 708         /* Test the new baudrate */
 709         wmt_params.op = MTK_WMT_TEST;
 710         wmt_params.flag = 7;
 711         wmt_params.dlen = 0;
 712         wmt_params.data = NULL;
 713         wmt_params.status = NULL;
 714
 715         err = mtk_hci_wmt_sync(hdev, &wmt_params);
 716         if (err < 0) {
 717                 bt_dev_err(hdev, "Failed to test new baudrate (%d)",
 718                            err);
 719                 return err;
 720         }
 721
 722         bdev->curr_speed = bdev->desired_speed;
 723
 724         return 0;
 725 }
 726
 727 static int btmtkuart_setup(struct hci_dev *hdev)
 728 {
 729         struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
 730         struct btmtk_hci_wmt_params wmt_params;
 731         ktime_t calltime, delta, rettime;
 732         struct btmtk_tci_sleep tci_sleep;
 733         unsigned long long duration;
 734         struct sk_buff *skb;
 735         int err, status;
 736         u8 param = 0x1;
 737
 738         calltime = ktime_get();
 739
 740         /* Wakeup MCUSYS is required for certain devices before we start to
 741          * do any setups.
 742          */
 743         if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) {
 744                 wmt_params.op = MTK_WMT_WAKEUP;
 745                 wmt_params.flag = 3;
 746                 wmt_params.dlen = 0;
 747                 wmt_params.data = NULL;
 748                 wmt_params.status = NULL;
 749
 750                 err = mtk_hci_wmt_sync(hdev, &wmt_params);
 751                 if (err < 0) {
 752                         bt_dev_err(hdev, "Failed to wakeup the chip (%d)", err);
 753                         return err;
 754                 }
 755
 756                 clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);
 757         }
 758
 759         if (btmtkuart_is_standalone(bdev))
 760                 btmtkuart_change_baudrate(hdev);
 761
 762         /* Query whether the firmware is already download */
 763         wmt_params.op = MTK_WMT_SEMAPHORE;
 764         wmt_params.flag = 1;
 765         wmt_params.dlen = 0;
 766         wmt_params.data = NULL;
 767         wmt_params.status = &status;
 768
 769         err = mtk_hci_wmt_sync(hdev, &wmt_params);
 770         if (err < 0) {
 771                 bt_dev_err(hdev, "Failed to query firmware status (%d)", err);
 772                 return err;
 773         }
 774
 775         if (status == BTMTK_WMT_PATCH_DONE) {
 776                 bt_dev_info(hdev, "Firmware already downloaded");
 777                 goto ignore_setup_fw;
 778         }
 779
 780         /* Setup a firmware which the device definitely requires */
 781         err = mtk_setup_firmware(hdev, bdev->data->fwname);
 782         if (err < 0)
 783                 return err;
 784
 785 ignore_setup_fw:
 786         /* Query whether the device is already enabled */
 787         err = readx_poll_timeout(btmtkuart_func_query, hdev, status,
 788                                  status < 0 || status != BTMTK_WMT_ON_PROGRESS,
 789                                  2000, 5000000);
 790         /* -ETIMEDOUT happens */
 791         if (err < 0)
 792                 return err;
 793
 794         /* The other errors happen in btusb_mtk_func_query */
 795         if (status < 0)
 796                 return status;
 797
 798         if (status == BTMTK_WMT_ON_DONE) {
 799                 bt_dev_info(hdev, "function already on");
 800                 goto ignore_func_on;
 801         }
 802
 803         /* Enable Bluetooth protocol */
 804         wmt_params.op = MTK_WMT_FUNC_CTRL;
 805         wmt_params.flag = 0;
 806         wmt_params.dlen = sizeof(param);
 807         wmt_params.data = &param;
 808         wmt_params.status = NULL;
 809
 810         err = mtk_hci_wmt_sync(hdev, &wmt_params);
 811         if (err < 0) {
 812                 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
 813                 return err;
 814         }
 815
 816 ignore_func_on:
 817         /* Apply the low power environment setup */
 818         tci_sleep.mode = 0x5;
 819         tci_sleep.duration = cpu_to_le16(0x640);
 820         tci_sleep.host_duration = cpu_to_le16(0x640);
 821         tci_sleep.host_wakeup_pin = 0;
 822         tci_sleep.time_compensation = 0;
 823
 824         skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep,
 825                              HCI_INIT_TIMEOUT);
 826         if (IS_ERR(skb)) {
 827                 err = PTR_ERR(skb);
 828                 bt_dev_err(hdev, "Failed to apply low power setting (%d)", err);
 829                 return err;
 830         }
 831         kfree_skb(skb);
 832
 833         rettime = ktime_get();
 834         delta = ktime_sub(rettime, calltime);
 835         duration = (unsigned long long)ktime_to_ns(delta) >> 10;
 836
 837         bt_dev_info(hdev, "Device setup in %llu usecs", duration);
 838
 839         return 0;
 840 }
 841
 842 static int btmtkuart_shutdown(struct hci_dev *hdev)
 843 {
 844         struct btmtk_hci_wmt_params wmt_params;
 845         u8 param = 0x0;
 846         int err;
 847
 848         /* Disable the device */
 849         wmt_params.op = MTK_WMT_FUNC_CTRL;
 850         wmt_params.flag = 0;
 851         wmt_params.dlen = sizeof(param);
 852         wmt_params.data = &param;
 853         wmt_params.status = NULL;
 854
 855         err = mtk_hci_wmt_sync(hdev, &wmt_params);
 856         if (err < 0) {
 857                 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
 858                 return err;
 859         }
 860
 861         return 0;
 862 }
 863
 864 static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 865 {
 866         struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
 867         struct mtk_stp_hdr *shdr;
 868         int err, dlen, type = 0;
 869
 870         /* Prepend skb with frame type */
 871         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 872
 873         /* Make sure that there is enough rooms for STP header and trailer */
 874         if (unlikely(skb_headroom(skb) < sizeof(*shdr)) ||
 875             (skb_tailroom(skb) < MTK_STP_TLR_SIZE)) {
 876                 err = pskb_expand_head(skb, sizeof(*shdr), MTK_STP_TLR_SIZE,
 877                                        GFP_ATOMIC);
 878                 if (err < 0)
 879                         return err;
 880         }
 881
 882         /* Add the STP header */
 883         dlen = skb->len;
 884         shdr = skb_push(skb, sizeof(*shdr));
 885         shdr->prefix = 0x80;
 886         shdr->dlen = cpu_to_be16((dlen & 0x0fff) | (type << 12));
 887         shdr->cs = 0;           /* MT7622 doesn't care about checksum value */
 888
 889         /* Add the STP trailer */
 890         skb_put_zero(skb, MTK_STP_TLR_SIZE);
 891
 892         skb_queue_tail(&bdev->txq, skb);
 893
 894         btmtkuart_tx_wakeup(bdev);
 895         return 0;
 896 }
 897
 898 static int btmtkuart_parse_dt(struct serdev_device *serdev)
 899 {
 900         struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
 901         struct device_node *node = serdev->dev.of_node;
 902         u32 speed = 921600;
 903         int err;
 904
 905         if (btmtkuart_is_standalone(bdev)) {
 906                 of_property_read_u32(node, "current-speed", &speed);
 907
 908                 bdev->desired_speed = speed;
 909
 910                 bdev->vcc = devm_regulator_get(&serdev->dev, "vcc");
 911                 if (IS_ERR(bdev->vcc)) {
 912                         err = PTR_ERR(bdev->vcc);
 913                         return err;
 914                 }
 915
 916                 bdev->osc = devm_clk_get_optional(&serdev->dev, "osc");
 917                 if (IS_ERR(bdev->osc)) {
 918                         err = PTR_ERR(bdev->osc);
 919                         return err;
 920                 }
 921
 922                 bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot",
 923                                                      GPIOD_OUT_LOW);
 924                 if (IS_ERR(bdev->boot)) {
 925                         err = PTR_ERR(bdev->boot);
 926                         return err;
 927                 }
 928
 929                 bdev->pinctrl = devm_pinctrl_get(&serdev->dev);
 930                 if (IS_ERR(bdev->pinctrl)) {
 931                         err = PTR_ERR(bdev->pinctrl);
 932                         return err;
 933                 }
 934
 935                 bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl,
 936                                                        "default");
 937                 if (IS_ERR(bdev->pins_boot) && !bdev->boot) {
 938                         err = PTR_ERR(bdev->pins_boot);
 939                         dev_err(&serdev->dev,
 940                                 "Should assign RXD to LOW at boot stage\n");
 941                         return err;
 942                 }
 943
 944                 bdev->pins_runtime = pinctrl_lookup_state(bdev->pinctrl,
 945                                                           "runtime");
 946                 if (IS_ERR(bdev->pins_runtime)) {
 947                         err = PTR_ERR(bdev->pins_runtime);
 948                         return err;
 949                 }
 950
 951                 bdev->reset = devm_gpiod_get_optional(&serdev->dev, "reset",
 952                                                       GPIOD_OUT_LOW);
 953                 if (IS_ERR(bdev->reset)) {
 954                         err = PTR_ERR(bdev->reset);
 955                         return err;
 956                 }
 957         } else if (btmtkuart_is_builtin_soc(bdev)) {
 958                 bdev->clk = devm_clk_get(&serdev->dev, "ref");
 959                 if (IS_ERR(bdev->clk))
 960                         return PTR_ERR(bdev->clk);
 961         }
 962
 963         return 0;
 964 }
 965
 966 static int btmtkuart_probe(struct serdev_device *serdev)
 967 {
 968         struct btmtkuart_dev *bdev;
 969         struct hci_dev *hdev;
 970         int err;
 971
 972         bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL);
 973         if (!bdev)
 974                 return -ENOMEM;
 975
 976         bdev->data = of_device_get_match_data(&serdev->dev);
 977         if (!bdev->data)
 978                 return -ENODEV;
 979
 980         bdev->serdev = serdev;
 981         serdev_device_set_drvdata(serdev, bdev);
 982
 983         serdev_device_set_client_ops(serdev, &btmtkuart_client_ops);
 984
 985         err = btmtkuart_parse_dt(serdev);
 986         if (err < 0)
 987                 return err;
 988
 989         INIT_WORK(&bdev->tx_work, btmtkuart_tx_work);
 990         skb_queue_head_init(&bdev->txq);
 991
 992         /* Initialize and register HCI device */
 993         hdev = hci_alloc_dev();
 994         if (!hdev) {
 995                 dev_err(&serdev->dev, "Can't allocate HCI device\n");
 996                 return -ENOMEM;
 997         }
 998
 999         bdev->hdev = hdev;
1000
1001         hdev->bus = HCI_UART;
1002         hci_set_drvdata(hdev, bdev);
1003
1004         hdev->open     = btmtkuart_open;
1005         hdev->close    = btmtkuart_close;
1006         hdev->flush    = btmtkuart_flush;
1007         hdev->setup    = btmtkuart_setup;
1008         hdev->shutdown = btmtkuart_shutdown;
1009         hdev->send     = btmtkuart_send_frame;
1010         SET_HCIDEV_DEV(hdev, &serdev->dev);
1011
1012         hdev->manufacturer = 70;
1013         set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
1014
1015         if (btmtkuart_is_standalone(bdev)) {
1016                 err = clk_prepare_enable(bdev->osc);
1017                 if (err < 0)
1018                         return err;
1019
1020                 if (bdev->boot) {
1021                         gpiod_set_value_cansleep(bdev->boot, 1);
1022                 } else {
1023                         /* Switch to the specific pin state for the booting
1024                          * requires.
1025                          */
1026                         pinctrl_select_state(bdev->pinctrl, bdev->pins_boot);
1027                 }
1028
1029                 /* Power on */
1030                 err = regulator_enable(bdev->vcc);
1031                 if (err < 0) {
1032                         clk_disable_unprepare(bdev->osc);
1033                         return err;
1034                 }
1035
1036                 /* Reset if the reset-gpios is available otherwise the board
1037                  * -level design should be guaranteed.
1038                  */
1039                 if (bdev->reset) {
1040                         gpiod_set_value_cansleep(bdev->reset, 1);
1041                         usleep_range(1000, 2000);
1042                         gpiod_set_value_cansleep(bdev->reset, 0);
1043                 }
1044
1045                 /* Wait some time until device got ready and switch to the pin
1046                  * mode the device requires for UART transfers.
1047                  */
1048                 msleep(50);
1049
1050                 if (bdev->boot)
1051                         devm_gpiod_put(&serdev->dev, bdev->boot);
1052
1053                 pinctrl_select_state(bdev->pinctrl, bdev->pins_runtime);
1054
1055                 /* A standalone device doesn't depends on power domain on SoC,
1056                  * so mark it as no callbacks.
1057                  */
1058                 pm_runtime_no_callbacks(&serdev->dev);
1059
1060                 set_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);
1061         }
1062
1063         err = hci_register_dev(hdev);
1064         if (err < 0) {
1065                 dev_err(&serdev->dev, "Can't register HCI device\n");
1066                 hci_free_dev(hdev);
1067                 goto err_regulator_disable;
1068         }
1069
1070         return 0;
1071
1072 err_regulator_disable:
1073         if (btmtkuart_is_standalone(bdev))
1074                 regulator_disable(bdev->vcc);
1075
1076         return err;
1077 }
1078
1079 static void btmtkuart_remove(struct serdev_device *serdev)
1080 {
1081         struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
1082         struct hci_dev *hdev = bdev->hdev;
1083
1084         if (btmtkuart_is_standalone(bdev)) {
1085                 regulator_disable(bdev->vcc);
1086                 clk_disable_unprepare(bdev->osc);
1087         }
1088
1089         hci_unregister_dev(hdev);
1090         hci_free_dev(hdev);
1091 }
1092
1093 static const struct btmtkuart_data mt7622_data = {
1094         .fwname = FIRMWARE_MT7622,
1095 };
1096
1097 static const struct btmtkuart_data mt7663_data = {
1098         .flags = BTMTKUART_FLAG_STANDALONE_HW,
1099         .fwname = FIRMWARE_MT7663,
1100 };
1101
1102 static const struct btmtkuart_data mt7668_data = {
1103         .flags = BTMTKUART_FLAG_STANDALONE_HW,
1104         .fwname = FIRMWARE_MT7668,
1105 };
1106
1107 #ifdef CONFIG_OF
1108 static const struct of_device_id mtk_of_match_table[] = {
1109         { .compatible = "mediatek,mt7622-bluetooth", .data = &mt7622_data},
1110         { .compatible = "mediatek,mt7663u-bluetooth", .data = &mt7663_data},
1111         { .compatible = "mediatek,mt7668u-bluetooth", .data = &mt7668_data},
1112         { }
1113 };
1114 MODULE_DEVICE_TABLE(of, mtk_of_match_table);
1115 #endif
1116
1117 static struct serdev_device_driver btmtkuart_driver = {
1118         .probe = btmtkuart_probe,
1119         .remove = btmtkuart_remove,
1120         .driver = {
1121                 .name = "btmtkuart",
1122                 .of_match_table = of_match_ptr(mtk_of_match_table),
1123         },
1124 };
1125
1126 module_serdev_device_driver(btmtkuart_driver);
1127
1128 MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
1129 MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION);
1130 MODULE_VERSION(VERSION);
1131 MODULE_LICENSE("GPL");
1132 MODULE_FIRMWARE(FIRMWARE_MT7622);
1133 MODULE_FIRMWARE(FIRMWARE_MT7663);
1134 MODULE_FIRMWARE(FIRMWARE_MT7668);