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x86/topology: Fix function name in documentation
[cris-mirror.git] / drivers / bluetooth / hci_ll.c
blob1b4417a623a412a995da4c800354cd03868815dd
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 }
CRIS linux kernel tree