1/*
2 * Bluetooth Software UART Qualcomm protocol
3 *
4 * HCI_IBS (HCI In-Band Sleep) is Qualcomm's power management
5 * protocol extension to H4.
6 *
7 * Copyright (C) 2007 Texas Instruments, Inc.
8 * Copyright (c) 2010, 2012, 2018 The Linux Foundation. All rights reserved.
9 *
10 * Acknowledgements:
11 * This file is based on hci_ll.c, which was...
12 * Written by Ohad Ben-Cohen <ohad@bencohen.org>
13 * which was in turn based on hci_h4.c, which was written
14 * by Maxim Krasnyansky and Marcel Holtmann.
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2
18 * as published by the Free Software Foundation
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 *
29 */
30
31#include <linux/kernel.h>
32#include <linux/clk.h>
33#include <linux/debugfs.h>
34#include <linux/delay.h>
35#include <linux/device.h>
36#include <linux/gpio/consumer.h>
37#include <linux/mod_devicetable.h>
38#include <linux/module.h>
39#include <linux/of_device.h>
40#include <linux/platform_device.h>
41#include <linux/regulator/consumer.h>
42#include <linux/serdev.h>
43#include <asm/unaligned.h>
44
45#include <net/bluetooth/bluetooth.h>
46#include <net/bluetooth/hci_core.h>
47
48#include "hci_uart.h"
49#include "btqca.h"
50
51/* HCI_IBS protocol messages */
52#define HCI_IBS_SLEEP_IND 0xFE
53#define HCI_IBS_WAKE_IND 0xFD
54#define HCI_IBS_WAKE_ACK 0xFC
55#define HCI_MAX_IBS_SIZE 10
56
57/* Controller states */
58#define STATE_IN_BAND_SLEEP_ENABLED 1
59
60#define IBS_WAKE_RETRANS_TIMEOUT_MS 100
61#define IBS_TX_IDLE_TIMEOUT_MS 2000
62#define CMD_TRANS_TIMEOUT_MS 100
63
64/* susclk rate */
65#define SUSCLK_RATE_32KHZ 32768
66
67/* Controller debug log header */
68#define QCA_DEBUG_HANDLE 0x2EDC
69
70/* HCI_IBS transmit side sleep protocol states */
71enum tx_ibs_states {
72 HCI_IBS_TX_ASLEEP,
73 HCI_IBS_TX_WAKING,
74 HCI_IBS_TX_AWAKE,
75};
76
77/* HCI_IBS receive side sleep protocol states */
78enum rx_states {
79 HCI_IBS_RX_ASLEEP,
80 HCI_IBS_RX_AWAKE,
81};
82
83/* HCI_IBS transmit and receive side clock state vote */
84enum hci_ibs_clock_state_vote {
85 HCI_IBS_VOTE_STATS_UPDATE,
86 HCI_IBS_TX_VOTE_CLOCK_ON,
87 HCI_IBS_TX_VOTE_CLOCK_OFF,
88 HCI_IBS_RX_VOTE_CLOCK_ON,
89 HCI_IBS_RX_VOTE_CLOCK_OFF,
90};
91
92struct qca_data {
93 struct hci_uart *hu;
94 struct sk_buff *rx_skb;
95 struct sk_buff_head txq;
96 struct sk_buff_head tx_wait_q; /* HCI_IBS wait queue */
97 spinlock_t hci_ibs_lock; /* HCI_IBS state lock */
98 u8 tx_ibs_state; /* HCI_IBS transmit side power state*/
99 u8 rx_ibs_state; /* HCI_IBS receive side power state */
100 bool tx_vote; /* Clock must be on for TX */
101 bool rx_vote; /* Clock must be on for RX */
102 struct timer_list tx_idle_timer;
103 u32 tx_idle_delay;
104 struct timer_list wake_retrans_timer;
105 u32 wake_retrans;
106 struct workqueue_struct *workqueue;
107 struct work_struct ws_awake_rx;
108 struct work_struct ws_awake_device;
109 struct work_struct ws_rx_vote_off;
110 struct work_struct ws_tx_vote_off;
111 unsigned long flags;
112
113 /* For debugging purpose */
114 u64 ibs_sent_wacks;
115 u64 ibs_sent_slps;
116 u64 ibs_sent_wakes;
117 u64 ibs_recv_wacks;
118 u64 ibs_recv_slps;
119 u64 ibs_recv_wakes;
120 u64 vote_last_jif;
121 u32 vote_on_ms;
122 u32 vote_off_ms;
123 u64 tx_votes_on;
124 u64 rx_votes_on;
125 u64 tx_votes_off;
126 u64 rx_votes_off;
127 u64 votes_on;
128 u64 votes_off;
129};
130
131enum qca_speed_type {
132 QCA_INIT_SPEED = 1,
133 QCA_OPER_SPEED
134};
135
136/*
137 * Voltage regulator information required for configuring the
138 * QCA Bluetooth chipset
139 */
140struct qca_vreg {
141 const char *name;
142 unsigned int min_uV;
143 unsigned int max_uV;
144 unsigned int load_uA;
145};
146
147struct qca_vreg_data {
148 enum qca_btsoc_type soc_type;
149 struct qca_vreg *vregs;
150 size_t num_vregs;
151};
152
153/*
154 * Platform data for the QCA Bluetooth power driver.
155 */
156struct qca_power {
157 struct device *dev;
158 const struct qca_vreg_data *vreg_data;
159 struct regulator_bulk_data *vreg_bulk;
160 bool vregs_on;
161};
162
163struct qca_serdev {
164 struct hci_uart serdev_hu;
165 struct gpio_desc *bt_en;
166 struct clk *susclk;
167 enum qca_btsoc_type btsoc_type;
168 struct qca_power *bt_power;
169 u32 init_speed;
170 u32 oper_speed;
171};
172
173static int qca_power_setup(struct hci_uart *hu, bool on);
174static void qca_power_shutdown(struct hci_uart *hu);
175static int qca_power_off(struct hci_dev *hdev);
176
177static void __serial_clock_on(struct tty_struct *tty)
178{
179 /* TODO: Some chipset requires to enable UART clock on client
180 * side to save power consumption or manual work is required.
181 * Please put your code to control UART clock here if needed
182 */
183}
184
185static void __serial_clock_off(struct tty_struct *tty)
186{
187 /* TODO: Some chipset requires to disable UART clock on client
188 * side to save power consumption or manual work is required.
189 * Please put your code to control UART clock off here if needed
190 */
191}
192
193/* serial_clock_vote needs to be called with the ibs lock held */
194static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
195{
196 struct qca_data *qca = hu->priv;
197 unsigned int diff;
198
199 bool old_vote = (qca->tx_vote | qca->rx_vote);
200 bool new_vote;
201
202 switch (vote) {
203 case HCI_IBS_VOTE_STATS_UPDATE:
204 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
205
206 if (old_vote)
207 qca->vote_off_ms += diff;
208 else
209 qca->vote_on_ms += diff;
210 return;
211
212 case HCI_IBS_TX_VOTE_CLOCK_ON:
213 qca->tx_vote = true;
214 qca->tx_votes_on++;
215 new_vote = true;
216 break;
217
218 case HCI_IBS_RX_VOTE_CLOCK_ON:
219 qca->rx_vote = true;
220 qca->rx_votes_on++;
221 new_vote = true;
222 break;
223
224 case HCI_IBS_TX_VOTE_CLOCK_OFF:
225 qca->tx_vote = false;
226 qca->tx_votes_off++;
227 new_vote = qca->rx_vote | qca->tx_vote;
228 break;
229
230 case HCI_IBS_RX_VOTE_CLOCK_OFF:
231 qca->rx_vote = false;
232 qca->rx_votes_off++;
233 new_vote = qca->rx_vote | qca->tx_vote;
234 break;
235
236 default:
237 BT_ERR("Voting irregularity");
238 return;
239 }
240
241 if (new_vote != old_vote) {
242 if (new_vote)
243 __serial_clock_on(hu->tty);
244 else
245 __serial_clock_off(hu->tty);
246
247 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
248 vote ? "true" : "false");
249
250 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
251
252 if (new_vote) {
253 qca->votes_on++;
254 qca->vote_off_ms += diff;
255 } else {
256 qca->votes_off++;
257 qca->vote_on_ms += diff;
258 }
259 qca->vote_last_jif = jiffies;
260 }
261}
262
263/* Builds and sends an HCI_IBS command packet.
264 * These are very simple packets with only 1 cmd byte.
265 */
266static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
267{
268 int err = 0;
269 struct sk_buff *skb = NULL;
270 struct qca_data *qca = hu->priv;
271
272 BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);
273
274 skb = bt_skb_alloc(1, GFP_ATOMIC);
275 if (!skb) {
276 BT_ERR("Failed to allocate memory for HCI_IBS packet");
277 return -ENOMEM;
278 }
279
280 /* Assign HCI_IBS type */
281 skb_put_u8(skb, cmd);
282
283 skb_queue_tail(&qca->txq, skb);
284
285 return err;
286}
287
288static void qca_wq_awake_device(struct work_struct *work)
289{
290 struct qca_data *qca = container_of(work, struct qca_data,
291 ws_awake_device);
292 struct hci_uart *hu = qca->hu;
293 unsigned long retrans_delay;
294
295 BT_DBG("hu %p wq awake device", hu);
296
297 /* Vote for serial clock */
298 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
299
300 spin_lock(&qca->hci_ibs_lock);
301
302 /* Send wake indication to device */
303 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
304 BT_ERR("Failed to send WAKE to device");
305
306 qca->ibs_sent_wakes++;
307
308 /* Start retransmit timer */
309 retrans_delay = msecs_to_jiffies(qca->wake_retrans);
310 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
311
312 spin_unlock(&qca->hci_ibs_lock);
313
314 /* Actually send the packets */
315 hci_uart_tx_wakeup(hu);
316}
317
318static void qca_wq_awake_rx(struct work_struct *work)
319{
320 struct qca_data *qca = container_of(work, struct qca_data,
321 ws_awake_rx);
322 struct hci_uart *hu = qca->hu;
323
324 BT_DBG("hu %p wq awake rx", hu);
325
326 serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
327
328 spin_lock(&qca->hci_ibs_lock);
329 qca->rx_ibs_state = HCI_IBS_RX_AWAKE;
330
331 /* Always acknowledge device wake up,
332 * sending IBS message doesn't count as TX ON.
333 */
334 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
335 BT_ERR("Failed to acknowledge device wake up");
336
337 qca->ibs_sent_wacks++;
338
339 spin_unlock(&qca->hci_ibs_lock);
340
341 /* Actually send the packets */
342 hci_uart_tx_wakeup(hu);
343}
344
345static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
346{
347 struct qca_data *qca = container_of(work, struct qca_data,
348 ws_rx_vote_off);
349 struct hci_uart *hu = qca->hu;
350
351 BT_DBG("hu %p rx clock vote off", hu);
352
353 serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
354}
355
356static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
357{
358 struct qca_data *qca = container_of(work, struct qca_data,
359 ws_tx_vote_off);
360 struct hci_uart *hu = qca->hu;
361
362 BT_DBG("hu %p tx clock vote off", hu);
363
364 /* Run HCI tx handling unlocked */
365 hci_uart_tx_wakeup(hu);
366
367 /* Now that message queued to tty driver, vote for tty clocks off.
368 * It is up to the tty driver to pend the clocks off until tx done.
369 */
370 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
371}
372
373static void hci_ibs_tx_idle_timeout(struct timer_list *t)
374{
375 struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
376 struct hci_uart *hu = qca->hu;
377 unsigned long flags;
378
379 BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);
380
381 spin_lock_irqsave_nested(&qca->hci_ibs_lock,
382 flags, SINGLE_DEPTH_NESTING);
383
384 switch (qca->tx_ibs_state) {
385 case HCI_IBS_TX_AWAKE:
386 /* TX_IDLE, go to SLEEP */
387 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
388 BT_ERR("Failed to send SLEEP to device");
389 break;
390 }
391 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
392 qca->ibs_sent_slps++;
393 queue_work(qca->workqueue, &qca->ws_tx_vote_off);
394 break;
395
396 case HCI_IBS_TX_ASLEEP:
397 case HCI_IBS_TX_WAKING:
398 /* Fall through */
399
400 default:
401 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
402 break;
403 }
404
405 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
406}
407
408static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
409{
410 struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
411 struct hci_uart *hu = qca->hu;
412 unsigned long flags, retrans_delay;
413 bool retransmit = false;
414
415 BT_DBG("hu %p wake retransmit timeout in %d state",
416 hu, qca->tx_ibs_state);
417
418 spin_lock_irqsave_nested(&qca->hci_ibs_lock,
419 flags, SINGLE_DEPTH_NESTING);
420
421 switch (qca->tx_ibs_state) {
422 case HCI_IBS_TX_WAKING:
423 /* No WAKE_ACK, retransmit WAKE */
424 retransmit = true;
425 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
426 BT_ERR("Failed to acknowledge device wake up");
427 break;
428 }
429 qca->ibs_sent_wakes++;
430 retrans_delay = msecs_to_jiffies(qca->wake_retrans);
431 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
432 break;
433
434 case HCI_IBS_TX_ASLEEP:
435 case HCI_IBS_TX_AWAKE:
436 /* Fall through */
437
438 default:
439 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
440 break;
441 }
442
443 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
444
445 if (retransmit)
446 hci_uart_tx_wakeup(hu);
447}
448
449/* Initialize protocol */
450static int qca_open(struct hci_uart *hu)
451{
452 struct qca_serdev *qcadev;
453 struct qca_data *qca;
454 int ret;
455
456 BT_DBG("hu %p qca_open", hu);
457
458 qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
459 if (!qca)
460 return -ENOMEM;
461
462 skb_queue_head_init(&qca->txq);
463 skb_queue_head_init(&qca->tx_wait_q);
464 spin_lock_init(&qca->hci_ibs_lock);
465 qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
466 if (!qca->workqueue) {
467 BT_ERR("QCA Workqueue not initialized properly");
468 kfree(qca);
469 return -ENOMEM;
470 }
471
472 INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
473 INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
474 INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
475 INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
476
477 qca->hu = hu;
478
479 /* Assume we start with both sides asleep -- extra wakes OK */
480 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
481 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
482
483 /* clocks actually on, but we start votes off */
484 qca->tx_vote = false;
485 qca->rx_vote = false;
486 qca->flags = 0;
487
488 qca->ibs_sent_wacks = 0;
489 qca->ibs_sent_slps = 0;
490 qca->ibs_sent_wakes = 0;
491 qca->ibs_recv_wacks = 0;
492 qca->ibs_recv_slps = 0;
493 qca->ibs_recv_wakes = 0;
494 qca->vote_last_jif = jiffies;
495 qca->vote_on_ms = 0;
496 qca->vote_off_ms = 0;
497 qca->votes_on = 0;
498 qca->votes_off = 0;
499 qca->tx_votes_on = 0;
500 qca->tx_votes_off = 0;
501 qca->rx_votes_on = 0;
502 qca->rx_votes_off = 0;
503
504 hu->priv = qca;
505
506 if (hu->serdev) {
507
508 qcadev = serdev_device_get_drvdata(hu->serdev);
509 if (qcadev->btsoc_type != QCA_WCN3990) {
510 gpiod_set_value_cansleep(qcadev->bt_en, 1);
511 } else {
512 hu->init_speed = qcadev->init_speed;
513 hu->oper_speed = qcadev->oper_speed;
514 ret = qca_power_setup(hu, true);
515 if (ret) {
516 destroy_workqueue(qca->workqueue);
517 kfree_skb(qca->rx_skb);
518 hu->priv = NULL;
519 kfree(qca);
520 return ret;
521 }
522 }
523 }
524
525 timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
526 qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
527
528 timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
529 qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
530
531 BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
532 qca->tx_idle_delay, qca->wake_retrans);
533
534 return 0;
535}
536
537static void qca_debugfs_init(struct hci_dev *hdev)
538{
539 struct hci_uart *hu = hci_get_drvdata(hdev);
540 struct qca_data *qca = hu->priv;
541 struct dentry *ibs_dir;
542 umode_t mode;
543
544 if (!hdev->debugfs)
545 return;
546
547 ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
548
549 /* read only */
550 mode = S_IRUGO;
551 debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
552 debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
553 debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
554 &qca->ibs_sent_slps);
555 debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
556 &qca->ibs_sent_wakes);
557 debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
558 &qca->ibs_sent_wacks);
559 debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
560 &qca->ibs_recv_slps);
561 debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
562 &qca->ibs_recv_wakes);
563 debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
564 &qca->ibs_recv_wacks);
565 debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
566 debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
567 debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
568 debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
569 debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
570 debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
571 debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
572 debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
573 debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
574 debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
575
576 /* read/write */
577 mode = S_IRUGO | S_IWUSR;
578 debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
579 debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
580 &qca->tx_idle_delay);
581}
582
583/* Flush protocol data */
584static int qca_flush(struct hci_uart *hu)
585{
586 struct qca_data *qca = hu->priv;
587
588 BT_DBG("hu %p qca flush", hu);
589
590 skb_queue_purge(&qca->tx_wait_q);
591 skb_queue_purge(&qca->txq);
592
593 return 0;
594}
595
596/* Close protocol */
597static int qca_close(struct hci_uart *hu)
598{
599 struct qca_serdev *qcadev;
600 struct qca_data *qca = hu->priv;
601
602 BT_DBG("hu %p qca close", hu);
603
604 serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
605
606 skb_queue_purge(&qca->tx_wait_q);
607 skb_queue_purge(&qca->txq);
608 del_timer(&qca->tx_idle_timer);
609 del_timer(&qca->wake_retrans_timer);
610 destroy_workqueue(qca->workqueue);
611 qca->hu = NULL;
612
613 if (hu->serdev) {
614 qcadev = serdev_device_get_drvdata(hu->serdev);
615 if (qcadev->btsoc_type == QCA_WCN3990)
616 qca_power_shutdown(hu);
617 else
618 gpiod_set_value_cansleep(qcadev->bt_en, 0);
619
620 }
621
622 kfree_skb(qca->rx_skb);
623
624 hu->priv = NULL;
625
626 kfree(qca);
627
628 return 0;
629}
630
631/* Called upon a wake-up-indication from the device.
632 */
633static void device_want_to_wakeup(struct hci_uart *hu)
634{
635 unsigned long flags;
636 struct qca_data *qca = hu->priv;
637
638 BT_DBG("hu %p want to wake up", hu);
639
640 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
641
642 qca->ibs_recv_wakes++;
643
644 switch (qca->rx_ibs_state) {
645 case HCI_IBS_RX_ASLEEP:
646 /* Make sure clock is on - we may have turned clock off since
647 * receiving the wake up indicator awake rx clock.
648 */
649 queue_work(qca->workqueue, &qca->ws_awake_rx);
650 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
651 return;
652
653 case HCI_IBS_RX_AWAKE:
654 /* Always acknowledge device wake up,
655 * sending IBS message doesn't count as TX ON.
656 */
657 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
658 BT_ERR("Failed to acknowledge device wake up");
659 break;
660 }
661 qca->ibs_sent_wacks++;
662 break;
663
664 default:
665 /* Any other state is illegal */
666 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
667 qca->rx_ibs_state);
668 break;
669 }
670
671 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
672
673 /* Actually send the packets */
674 hci_uart_tx_wakeup(hu);
675}
676
677/* Called upon a sleep-indication from the device.
678 */
679static void device_want_to_sleep(struct hci_uart *hu)
680{
681 unsigned long flags;
682 struct qca_data *qca = hu->priv;
683
684 BT_DBG("hu %p want to sleep", hu);
685
686 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
687
688 qca->ibs_recv_slps++;
689
690 switch (qca->rx_ibs_state) {
691 case HCI_IBS_RX_AWAKE:
692 /* Update state */
693 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
694 /* Vote off rx clock under workqueue */
695 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
696 break;
697
698 case HCI_IBS_RX_ASLEEP:
699 /* Fall through */
700
701 default:
702 /* Any other state is illegal */
703 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
704 qca->rx_ibs_state);
705 break;
706 }
707
708 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
709}
710
711/* Called upon wake-up-acknowledgement from the device
712 */
713static void device_woke_up(struct hci_uart *hu)
714{
715 unsigned long flags, idle_delay;
716 struct qca_data *qca = hu->priv;
717 struct sk_buff *skb = NULL;
718
719 BT_DBG("hu %p woke up", hu);
720
721 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
722
723 qca->ibs_recv_wacks++;
724
725 switch (qca->tx_ibs_state) {
726 case HCI_IBS_TX_AWAKE:
727 /* Expect one if we send 2 WAKEs */
728 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
729 qca->tx_ibs_state);
730 break;
731
732 case HCI_IBS_TX_WAKING:
733 /* Send pending packets */
734 while ((skb = skb_dequeue(&qca->tx_wait_q)))
735 skb_queue_tail(&qca->txq, skb);
736
737 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
738 del_timer(&qca->wake_retrans_timer);
739 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
740 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
741 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
742 break;
743
744 case HCI_IBS_TX_ASLEEP:
745 /* Fall through */
746
747 default:
748 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
749 qca->tx_ibs_state);
750 break;
751 }
752
753 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
754
755 /* Actually send the packets */
756 hci_uart_tx_wakeup(hu);
757}
758
759/* Enqueue frame for transmittion (padding, crc, etc) may be called from
760 * two simultaneous tasklets.
761 */
762static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
763{
764 unsigned long flags = 0, idle_delay;
765 struct qca_data *qca = hu->priv;
766
767 BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
768 qca->tx_ibs_state);
769
770 /* Prepend skb with frame type */
771 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
772
773 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
774
775 /* Don't go to sleep in middle of patch download or
776 * Out-Of-Band(GPIOs control) sleep is selected.
777 */
778 if (!test_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags)) {
779 skb_queue_tail(&qca->txq, skb);
780 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
781 return 0;
782 }
783
784 /* Act according to current state */
785 switch (qca->tx_ibs_state) {
786 case HCI_IBS_TX_AWAKE:
787 BT_DBG("Device awake, sending normally");
788 skb_queue_tail(&qca->txq, skb);
789 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
790 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
791 break;
792
793 case HCI_IBS_TX_ASLEEP:
794 BT_DBG("Device asleep, waking up and queueing packet");
795 /* Save packet for later */
796 skb_queue_tail(&qca->tx_wait_q, skb);
797
798 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
799 /* Schedule a work queue to wake up device */
800 queue_work(qca->workqueue, &qca->ws_awake_device);
801 break;
802
803 case HCI_IBS_TX_WAKING:
804 BT_DBG("Device waking up, queueing packet");
805 /* Transient state; just keep packet for later */
806 skb_queue_tail(&qca->tx_wait_q, skb);
807 break;
808
809 default:
810 BT_ERR("Illegal tx state: %d (losing packet)",
811 qca->tx_ibs_state);
812 kfree_skb(skb);
813 break;
814 }
815
816 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
817
818 return 0;
819}
820
821static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
822{
823 struct hci_uart *hu = hci_get_drvdata(hdev);
824
825 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
826
827 device_want_to_sleep(hu);
828
829 kfree_skb(skb);
830 return 0;
831}
832
833static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
834{
835 struct hci_uart *hu = hci_get_drvdata(hdev);
836
837 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
838
839 device_want_to_wakeup(hu);
840
841 kfree_skb(skb);
842 return 0;
843}
844
845static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
846{
847 struct hci_uart *hu = hci_get_drvdata(hdev);
848
849 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
850
851 device_woke_up(hu);
852
853 kfree_skb(skb);
854 return 0;
855}
856
857static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
858{
859 /* We receive debug logs from chip as an ACL packets.
860 * Instead of sending the data to ACL to decode the
861 * received data, we are pushing them to the above layers
862 * as a diagnostic packet.
863 */
864 if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
865 return hci_recv_diag(hdev, skb);
866
867 return hci_recv_frame(hdev, skb);
868}
869
870#define QCA_IBS_SLEEP_IND_EVENT \
871 .type = HCI_IBS_SLEEP_IND, \
872 .hlen = 0, \
873 .loff = 0, \
874 .lsize = 0, \
875 .maxlen = HCI_MAX_IBS_SIZE
876
877#define QCA_IBS_WAKE_IND_EVENT \
878 .type = HCI_IBS_WAKE_IND, \
879 .hlen = 0, \
880 .loff = 0, \
881 .lsize = 0, \
882 .maxlen = HCI_MAX_IBS_SIZE
883
884#define QCA_IBS_WAKE_ACK_EVENT \
885 .type = HCI_IBS_WAKE_ACK, \
886 .hlen = 0, \
887 .loff = 0, \
888 .lsize = 0, \
889 .maxlen = HCI_MAX_IBS_SIZE
890
891static const struct h4_recv_pkt qca_recv_pkts[] = {
892 { H4_RECV_ACL, .recv = qca_recv_acl_data },
893 { H4_RECV_SCO, .recv = hci_recv_frame },
894 { H4_RECV_EVENT, .recv = hci_recv_frame },
895 { QCA_IBS_WAKE_IND_EVENT, .recv = qca_ibs_wake_ind },
896 { QCA_IBS_WAKE_ACK_EVENT, .recv = qca_ibs_wake_ack },
897 { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
898};
899
900static int qca_recv(struct hci_uart *hu, const void *data, int count)
901{
902 struct qca_data *qca = hu->priv;
903
904 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
905 return -EUNATCH;
906
907 qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
908 qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
909 if (IS_ERR(qca->rx_skb)) {
910 int err = PTR_ERR(qca->rx_skb);
911 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
912 qca->rx_skb = NULL;
913 return err;
914 }
915
916 return count;
917}
918
919static struct sk_buff *qca_dequeue(struct hci_uart *hu)
920{
921 struct qca_data *qca = hu->priv;
922
923 return skb_dequeue(&qca->txq);
924}
925
926static uint8_t qca_get_baudrate_value(int speed)
927{
928 switch (speed) {
929 case 9600:
930 return QCA_BAUDRATE_9600;
931 case 19200:
932 return QCA_BAUDRATE_19200;
933 case 38400:
934 return QCA_BAUDRATE_38400;
935 case 57600:
936 return QCA_BAUDRATE_57600;
937 case 115200:
938 return QCA_BAUDRATE_115200;
939 case 230400:
940 return QCA_BAUDRATE_230400;
941 case 460800:
942 return QCA_BAUDRATE_460800;
943 case 500000:
944 return QCA_BAUDRATE_500000;
945 case 921600:
946 return QCA_BAUDRATE_921600;
947 case 1000000:
948 return QCA_BAUDRATE_1000000;
949 case 2000000:
950 return QCA_BAUDRATE_2000000;
951 case 3000000:
952 return QCA_BAUDRATE_3000000;
953 case 3200000:
954 return QCA_BAUDRATE_3200000;
955 case 3500000:
956 return QCA_BAUDRATE_3500000;
957 default:
958 return QCA_BAUDRATE_115200;
959 }
960}
961
962static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
963{
964 struct hci_uart *hu = hci_get_drvdata(hdev);
965 struct qca_data *qca = hu->priv;
966 struct qca_serdev *qcadev;
967 struct sk_buff *skb;
968 u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
969
970 if (baudrate > QCA_BAUDRATE_3200000)
971 return -EINVAL;
972
973 cmd[4] = baudrate;
974
975 skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
976 if (!skb) {
977 bt_dev_err(hdev, "Failed to allocate baudrate packet");
978 return -ENOMEM;
979 }
980
981 /* Assign commands to change baudrate and packet type. */
982 skb_put_data(skb, cmd, sizeof(cmd));
983 hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
984
985 skb_queue_tail(&qca->txq, skb);
986 hci_uart_tx_wakeup(hu);
987
988 qcadev = serdev_device_get_drvdata(hu->serdev);
989
990 /* Wait for the baudrate change request to be sent */
991
992 while (!skb_queue_empty(&qca->txq))
993 usleep_range(100, 200);
994
995 serdev_device_wait_until_sent(hu->serdev,
996 msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
997
998 /* Give the controller time to process the request */
999 if (qcadev->btsoc_type == QCA_WCN3990)
1000 msleep(10);
1001 else
1002 msleep(300);
1003
1004 return 0;
1005}
1006
1007static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
1008{
1009 if (hu->serdev)
1010 serdev_device_set_baudrate(hu->serdev, speed);
1011 else
1012 hci_uart_set_baudrate(hu, speed);
1013}
1014
1015static int qca_send_power_pulse(struct hci_uart *hu, bool on)
1016{
1017 int ret;
1018 int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
1019 u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;
1020
1021 /* These power pulses are single byte command which are sent
1022 * at required baudrate to wcn3990. On wcn3990, we have an external
1023 * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1024 * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1025 * and also we use the same power inputs to turn on and off for
1026 * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1027 * we send a power on pulse at 115200 bps. This algorithm will help to
1028 * save power. Disabling hardware flow control is mandatory while
1029 * sending power pulses to SoC.
1030 */
1031 bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);
1032
1033 serdev_device_write_flush(hu->serdev);
1034 hci_uart_set_flow_control(hu, true);
1035 ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
1036 if (ret < 0) {
1037 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
1038 return ret;
1039 }
1040
1041 serdev_device_wait_until_sent(hu->serdev, timeout);
1042 hci_uart_set_flow_control(hu, false);
1043
1044 /* Give to controller time to boot/shutdown */
1045 if (on)
1046 msleep(100);
1047 else
1048 msleep(10);
1049
1050 return 0;
1051}
1052
1053static unsigned int qca_get_speed(struct hci_uart *hu,
1054 enum qca_speed_type speed_type)
1055{
1056 unsigned int speed = 0;
1057
1058 if (speed_type == QCA_INIT_SPEED) {
1059 if (hu->init_speed)
1060 speed = hu->init_speed;
1061 else if (hu->proto->init_speed)
1062 speed = hu->proto->init_speed;
1063 } else {
1064 if (hu->oper_speed)
1065 speed = hu->oper_speed;
1066 else if (hu->proto->oper_speed)
1067 speed = hu->proto->oper_speed;
1068 }
1069
1070 return speed;
1071}
1072
1073static int qca_check_speeds(struct hci_uart *hu)
1074{
1075 struct qca_serdev *qcadev;
1076
1077 qcadev = serdev_device_get_drvdata(hu->serdev);
1078 if (qcadev->btsoc_type == QCA_WCN3990) {
1079 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1080 !qca_get_speed(hu, QCA_OPER_SPEED))
1081 return -EINVAL;
1082 } else {
1083 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1084 !qca_get_speed(hu, QCA_OPER_SPEED))
1085 return -EINVAL;
1086 }
1087
1088 return 0;
1089}
1090
1091static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1092{
1093 unsigned int speed, qca_baudrate;
1094 struct qca_serdev *qcadev;
1095 int ret = 0;
1096
1097 if (speed_type == QCA_INIT_SPEED) {
1098 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1099 if (speed)
1100 host_set_baudrate(hu, speed);
1101 } else {
1102 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1103 if (!speed)
1104 return 0;
1105
1106 /* Disable flow control for wcn3990 to deassert RTS while
1107 * changing the baudrate of chip and host.
1108 */
1109 qcadev = serdev_device_get_drvdata(hu->serdev);
1110 if (qcadev->btsoc_type == QCA_WCN3990)
1111 hci_uart_set_flow_control(hu, true);
1112
1113 qca_baudrate = qca_get_baudrate_value(speed);
1114 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1115 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1116 if (ret)
1117 goto error;
1118
1119 host_set_baudrate(hu, speed);
1120
1121error:
1122 if (qcadev->btsoc_type == QCA_WCN3990)
1123 hci_uart_set_flow_control(hu, false);
1124 }
1125
1126 return ret;
1127}
1128
1129static int qca_wcn3990_init(struct hci_uart *hu)
1130{
1131 struct qca_serdev *qcadev;
1132 int ret;
1133
1134 /* Check for vregs status, may be hci down has turned
1135 * off the voltage regulator.
1136 */
1137 qcadev = serdev_device_get_drvdata(hu->serdev);
1138 if (!qcadev->bt_power->vregs_on) {
1139 serdev_device_close(hu->serdev);
1140 ret = qca_power_setup(hu, true);
1141 if (ret)
1142 return ret;
1143
1144 ret = serdev_device_open(hu->serdev);
1145 if (ret) {
1146 bt_dev_err(hu->hdev, "failed to open port");
1147 return ret;
1148 }
1149 }
1150
1151 /* Forcefully enable wcn3990 to enter in to boot mode. */
1152 host_set_baudrate(hu, 2400);
1153 ret = qca_send_power_pulse(hu, false);
1154 if (ret)
1155 return ret;
1156
1157 qca_set_speed(hu, QCA_INIT_SPEED);
1158 ret = qca_send_power_pulse(hu, true);
1159 if (ret)
1160 return ret;
1161
1162 /* Now the device is in ready state to communicate with host.
1163 * To sync host with device we need to reopen port.
1164 * Without this, we will have RTS and CTS synchronization
1165 * issues.
1166 */
1167 serdev_device_close(hu->serdev);
1168 ret = serdev_device_open(hu->serdev);
1169 if (ret) {
1170 bt_dev_err(hu->hdev, "failed to open port");
1171 return ret;
1172 }
1173
1174 hci_uart_set_flow_control(hu, false);
1175
1176 return 0;
1177}
1178
1179static int qca_setup(struct hci_uart *hu)
1180{
1181 struct hci_dev *hdev = hu->hdev;
1182 struct qca_data *qca = hu->priv;
1183 unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1184 struct qca_serdev *qcadev;
1185 int ret;
1186 int soc_ver = 0;
1187
1188 qcadev = serdev_device_get_drvdata(hu->serdev);
1189
1190 ret = qca_check_speeds(hu);
1191 if (ret)
1192 return ret;
1193
1194 /* Patch downloading has to be done without IBS mode */
1195 clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1196
1197 if (qcadev->btsoc_type == QCA_WCN3990) {
1198 bt_dev_info(hdev, "setting up wcn3990");
1199
1200 /* Enable NON_PERSISTENT_SETUP QUIRK to ensure to execute
1201 * setup for every hci up.
1202 */
1203 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
1204 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
1205 hu->hdev->shutdown = qca_power_off;
1206 ret = qca_wcn3990_init(hu);
1207 if (ret)
1208 return ret;
1209
1210 ret = qca_read_soc_version(hdev, &soc_ver);
1211 if (ret)
1212 return ret;
1213 } else {
1214 bt_dev_info(hdev, "ROME setup");
1215 qca_set_speed(hu, QCA_INIT_SPEED);
1216 }
1217
1218 /* Setup user speed if needed */
1219 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1220 if (speed) {
1221 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1222 if (ret)
1223 return ret;
1224
1225 qca_baudrate = qca_get_baudrate_value(speed);
1226 }
1227
1228 if (qcadev->btsoc_type != QCA_WCN3990) {
1229 /* Get QCA version information */
1230 ret = qca_read_soc_version(hdev, &soc_ver);
1231 if (ret)
1232 return ret;
1233 }
1234
1235 bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
1236 /* Setup patch / NVM configurations */
1237 ret = qca_uart_setup(hdev, qca_baudrate, qcadev->btsoc_type, soc_ver);
1238 if (!ret) {
1239 set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1240 qca_debugfs_init(hdev);
1241 } else if (ret == -ENOENT) {
1242 /* No patch/nvm-config found, run with original fw/config */
1243 ret = 0;
1244 } else if (ret == -EAGAIN) {
1245 /*
1246 * Userspace firmware loader will return -EAGAIN in case no
1247 * patch/nvm-config is found, so run with original fw/config.
1248 */
1249 ret = 0;
1250 }
1251
1252 /* Setup bdaddr */
1253 if (qcadev->btsoc_type == QCA_WCN3990)
1254 hu->hdev->set_bdaddr = qca_set_bdaddr;
1255 else
1256 hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1257
1258 return ret;
1259}
1260
1261static struct hci_uart_proto qca_proto = {
1262 .id = HCI_UART_QCA,
1263 .name = "QCA",
1264 .manufacturer = 29,
1265 .init_speed = 115200,
1266 .oper_speed = 3000000,
1267 .open = qca_open,
1268 .close = qca_close,
1269 .flush = qca_flush,
1270 .setup = qca_setup,
1271 .recv = qca_recv,
1272 .enqueue = qca_enqueue,
1273 .dequeue = qca_dequeue,
1274};
1275
1276static const struct qca_vreg_data qca_soc_data = {
1277 .soc_type = QCA_WCN3990,
1278 .vregs = (struct qca_vreg []) {
1279 { "vddio", 1800000, 1900000, 15000 },
1280 { "vddxo", 1800000, 1900000, 80000 },
1281 { "vddrf", 1300000, 1350000, 300000 },
1282 { "vddch0", 3300000, 3400000, 450000 },
1283 },
1284 .num_vregs = 4,
1285};
1286
1287static void qca_power_shutdown(struct hci_uart *hu)
1288{
1289 struct qca_data *qca = hu->priv;
1290 unsigned long flags;
1291
1292 /* From this point we go into power off state. But serial port is
1293 * still open, stop queueing the IBS data and flush all the buffered
1294 * data in skb's.
1295 */
1296 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
1297 clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1298 qca_flush(hu);
1299 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
1300
1301 host_set_baudrate(hu, 2400);
1302 qca_send_power_pulse(hu, false);
1303 qca_power_setup(hu, false);
1304}
1305
1306static int qca_power_off(struct hci_dev *hdev)
1307{
1308 struct hci_uart *hu = hci_get_drvdata(hdev);
1309
1310 qca_power_shutdown(hu);
1311 return 0;
1312}
1313
1314static int qca_enable_regulator(struct qca_vreg vregs,
1315 struct regulator *regulator)
1316{
1317 int ret;
1318
1319 ret = regulator_set_voltage(regulator, vregs.min_uV,
1320 vregs.max_uV);
1321 if (ret)
1322 return ret;
1323
1324 if (vregs.load_uA)
1325 ret = regulator_set_load(regulator,
1326 vregs.load_uA);
1327
1328 if (ret)
1329 return ret;
1330
1331 return regulator_enable(regulator);
1332
1333}
1334
1335static void qca_disable_regulator(struct qca_vreg vregs,
1336 struct regulator *regulator)
1337{
1338 regulator_disable(regulator);
1339 regulator_set_voltage(regulator, 0, vregs.max_uV);
1340 if (vregs.load_uA)
1341 regulator_set_load(regulator, 0);
1342
1343}
1344
1345static int qca_power_setup(struct hci_uart *hu, bool on)
1346{
1347 struct qca_vreg *vregs;
1348 struct regulator_bulk_data *vreg_bulk;
1349 struct qca_serdev *qcadev;
1350 int i, num_vregs, ret = 0;
1351
1352 qcadev = serdev_device_get_drvdata(hu->serdev);
1353 if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data ||
1354 !qcadev->bt_power->vreg_bulk)
1355 return -EINVAL;
1356
1357 vregs = qcadev->bt_power->vreg_data->vregs;
1358 vreg_bulk = qcadev->bt_power->vreg_bulk;
1359 num_vregs = qcadev->bt_power->vreg_data->num_vregs;
1360 BT_DBG("on: %d", on);
1361 if (on && !qcadev->bt_power->vregs_on) {
1362 for (i = 0; i < num_vregs; i++) {
1363 ret = qca_enable_regulator(vregs[i],
1364 vreg_bulk[i].consumer);
1365 if (ret)
1366 break;
1367 }
1368
1369 if (ret) {
1370 BT_ERR("failed to enable regulator:%s", vregs[i].name);
1371 /* turn off regulators which are enabled */
1372 for (i = i - 1; i >= 0; i--)
1373 qca_disable_regulator(vregs[i],
1374 vreg_bulk[i].consumer);
1375 } else {
1376 qcadev->bt_power->vregs_on = true;
1377 }
1378 } else if (!on && qcadev->bt_power->vregs_on) {
1379 /* turn off regulator in reverse order */
1380 i = qcadev->bt_power->vreg_data->num_vregs - 1;
1381 for ( ; i >= 0; i--)
1382 qca_disable_regulator(vregs[i], vreg_bulk[i].consumer);
1383
1384 qcadev->bt_power->vregs_on = false;
1385 }
1386
1387 return ret;
1388}
1389
1390static int qca_init_regulators(struct qca_power *qca,
1391 const struct qca_vreg *vregs, size_t num_vregs)
1392{
1393 int i;
1394
1395 qca->vreg_bulk = devm_kcalloc(qca->dev, num_vregs,
1396 sizeof(struct regulator_bulk_data),
1397 GFP_KERNEL);
1398 if (!qca->vreg_bulk)
1399 return -ENOMEM;
1400
1401 for (i = 0; i < num_vregs; i++)
1402 qca->vreg_bulk[i].supply = vregs[i].name;
1403
1404 return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk);
1405}
1406
1407static int qca_serdev_probe(struct serdev_device *serdev)
1408{
1409 struct qca_serdev *qcadev;
1410 const struct qca_vreg_data *data;
1411 int err;
1412
1413 qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1414 if (!qcadev)
1415 return -ENOMEM;
1416
1417 qcadev->serdev_hu.serdev = serdev;
1418 data = of_device_get_match_data(&serdev->dev);
1419 serdev_device_set_drvdata(serdev, qcadev);
1420 if (data && data->soc_type == QCA_WCN3990) {
1421 qcadev->btsoc_type = QCA_WCN3990;
1422 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1423 sizeof(struct qca_power),
1424 GFP_KERNEL);
1425 if (!qcadev->bt_power)
1426 return -ENOMEM;
1427
1428 qcadev->bt_power->dev = &serdev->dev;
1429 qcadev->bt_power->vreg_data = data;
1430 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1431 data->num_vregs);
1432 if (err) {
1433 BT_ERR("Failed to init regulators:%d", err);
1434 goto out;
1435 }
1436
1437 qcadev->bt_power->vregs_on = false;
1438
1439 device_property_read_u32(&serdev->dev, "max-speed",
1440 &qcadev->oper_speed);
1441 if (!qcadev->oper_speed)
1442 BT_DBG("UART will pick default operating speed");
1443
1444 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1445 if (err) {
1446 BT_ERR("wcn3990 serdev registration failed");
1447 goto out;
1448 }
1449 } else {
1450 qcadev->btsoc_type = QCA_ROME;
1451 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
1452 GPIOD_OUT_LOW);
1453 if (IS_ERR(qcadev->bt_en)) {
1454 dev_err(&serdev->dev, "failed to acquire enable gpio\n");
1455 return PTR_ERR(qcadev->bt_en);
1456 }
1457
1458 qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
1459 if (IS_ERR(qcadev->susclk)) {
1460 dev_err(&serdev->dev, "failed to acquire clk\n");
1461 return PTR_ERR(qcadev->susclk);
1462 }
1463
1464 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
1465 if (err)
1466 return err;
1467
1468 err = clk_prepare_enable(qcadev->susclk);
1469 if (err)
1470 return err;
1471
1472 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1473 if (err)
1474 clk_disable_unprepare(qcadev->susclk);
1475 }
1476
1477out: return err;
1478
1479}
1480
1481static void qca_serdev_remove(struct serdev_device *serdev)
1482{
1483 struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
1484
1485 if (qcadev->btsoc_type == QCA_WCN3990)
1486 qca_power_shutdown(&qcadev->serdev_hu);
1487 else
1488 clk_disable_unprepare(qcadev->susclk);
1489
1490 hci_uart_unregister_device(&qcadev->serdev_hu);
1491}
1492
1493static const struct of_device_id qca_bluetooth_of_match[] = {
1494 { .compatible = "qcom,qca6174-bt" },
1495 { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data},
1496 { /* sentinel */ }
1497};
1498MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
1499
1500static struct serdev_device_driver qca_serdev_driver = {
1501 .probe = qca_serdev_probe,
1502 .remove = qca_serdev_remove,
1503 .driver = {
1504 .name = "hci_uart_qca",
1505 .of_match_table = qca_bluetooth_of_match,
1506 },
1507};
1508
1509int __init qca_init(void)
1510{
1511 serdev_device_driver_register(&qca_serdev_driver);
1512
1513 return hci_uart_register_proto(&qca_proto);
1514}
1515
1516int __exit qca_deinit(void)
1517{
1518 serdev_device_driver_unregister(&qca_serdev_driver);
1519
1520 return hci_uart_unregister_proto(&qca_proto);
1521}
1522