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Merge branch 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm...
[linux-2.6-block.git] / drivers / bluetooth / hci_qca.c
CommitLineData
0ff252c1
BYTK		 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.
fa9ad876 8 * Copyright (c) 2010, 2012, 2018 The Linux Foundation. All rights reserved.
0ff252c1
BYTK		 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>
05ba533c 32#include <linux/clk.h>
0ff252c1 33#include <linux/debugfs.h>
fa9ad876
BG		 34#include <linux/delay.h>
35#include <linux/device.h>
05ba533c
TE		 36#include <linux/gpio/consumer.h>
37#include <linux/mod_devicetable.h>
38#include <linux/module.h>
fa9ad876
BG		 39#include <linux/of_device.h>
40#include <linux/platform_device.h>
41#include <linux/regulator/consumer.h>
05ba533c 42#include <linux/serdev.h>
0ff252c1
BYTK		 43
44#include <net/bluetooth/bluetooth.h>
45#include <net/bluetooth/hci_core.h>
46
47#include "hci_uart.h"
48#include "btqca.h"
49
50/* HCI_IBS protocol messages */
51#define HCI_IBS_SLEEP_IND 0xFE
52#define HCI_IBS_WAKE_IND 0xFD
53#define HCI_IBS_WAKE_ACK 0xFC
f81b001a 54#define HCI_MAX_IBS_SIZE 10
0ff252c1
BYTK		 55
56/* Controller states */
57#define STATE_IN_BAND_SLEEP_ENABLED 1
58
f81b001a
MH		 59#define IBS_WAKE_RETRANS_TIMEOUT_MS 100
60#define IBS_TX_IDLE_TIMEOUT_MS 2000
0ff252c1
BYTK		 61#define BAUDRATE_SETTLE_TIMEOUT_MS 300
62
05ba533c
TE		 63/* susclk rate */
64#define SUSCLK_RATE_32KHZ 32768
65
0ff252c1
BYTK		 66/* HCI_IBS transmit side sleep protocol states */
67enum tx_ibs_states {
68 HCI_IBS_TX_ASLEEP,
69 HCI_IBS_TX_WAKING,
70 HCI_IBS_TX_AWAKE,
71};
72
73/* HCI_IBS receive side sleep protocol states */
74enum rx_states {
75 HCI_IBS_RX_ASLEEP,
76 HCI_IBS_RX_AWAKE,
77};
78
79/* HCI_IBS transmit and receive side clock state vote */
80enum hci_ibs_clock_state_vote {
81 HCI_IBS_VOTE_STATS_UPDATE,
82 HCI_IBS_TX_VOTE_CLOCK_ON,
83 HCI_IBS_TX_VOTE_CLOCK_OFF,
84 HCI_IBS_RX_VOTE_CLOCK_ON,
85 HCI_IBS_RX_VOTE_CLOCK_OFF,
86};
87
88struct qca_data {
89 struct hci_uart *hu;
90 struct sk_buff *rx_skb;
91 struct sk_buff_head txq;
92 struct sk_buff_head tx_wait_q; /* HCI_IBS wait queue */
93 spinlock_t hci_ibs_lock; /* HCI_IBS state lock */
94 u8 tx_ibs_state; /* HCI_IBS transmit side power state*/
95 u8 rx_ibs_state; /* HCI_IBS receive side power state */
621a5f7a
VK		 96 bool tx_vote; /* Clock must be on for TX */
97 bool rx_vote; /* Clock must be on for RX */
0ff252c1
BYTK		 98 struct timer_list tx_idle_timer;
99 u32 tx_idle_delay;
100 struct timer_list wake_retrans_timer;
101 u32 wake_retrans;
102 struct workqueue_struct *workqueue;
103 struct work_struct ws_awake_rx;
104 struct work_struct ws_awake_device;
105 struct work_struct ws_rx_vote_off;
106 struct work_struct ws_tx_vote_off;
107 unsigned long flags;
108
109 /* For debugging purpose */
110 u64 ibs_sent_wacks;
111 u64 ibs_sent_slps;
112 u64 ibs_sent_wakes;
113 u64 ibs_recv_wacks;
114 u64 ibs_recv_slps;
115 u64 ibs_recv_wakes;
116 u64 vote_last_jif;
117 u32 vote_on_ms;
118 u32 vote_off_ms;
119 u64 tx_votes_on;
120 u64 rx_votes_on;
121 u64 tx_votes_off;
122 u64 rx_votes_off;
123 u64 votes_on;
124 u64 votes_off;
125};
126
83d9c5e5
BG		 127enum qca_speed_type {
128 QCA_INIT_SPEED = 1,
129 QCA_OPER_SPEED
130};
131
fa9ad876
BG		 132/*
133 * Voltage regulator information required for configuring the
134 * QCA Bluetooth chipset
135 */
136struct qca_vreg {
137 const char *name;
138 unsigned int min_uV;
139 unsigned int max_uV;
140 unsigned int load_uA;
141};
142
143struct qca_vreg_data {
144 enum qca_btsoc_type soc_type;
145 struct qca_vreg *vregs;
146 size_t num_vregs;
147};
148
149/*
150 * Platform data for the QCA Bluetooth power driver.
151 */
152struct qca_power {
153 struct device *dev;
154 const struct qca_vreg_data *vreg_data;
155 struct regulator_bulk_data *vreg_bulk;
156 bool vregs_on;
157};
158
05ba533c
TE		 159struct qca_serdev {
160 struct hci_uart serdev_hu;
161 struct gpio_desc *bt_en;
162 struct clk *susclk;
fa9ad876
BG		 163 enum qca_btsoc_type btsoc_type;
164 struct qca_power *bt_power;
165 u32 init_speed;
166 u32 oper_speed;
05ba533c
TE		 167};
168
fa9ad876
BG		 169static int qca_power_setup(struct hci_uart *hu, bool on);
170static void qca_power_shutdown(struct hci_dev *hdev);
171
0ff252c1
BYTK		 172static void __serial_clock_on(struct tty_struct *tty)
173{
174 /* TODO: Some chipset requires to enable UART clock on client
175 * side to save power consumption or manual work is required.
176 * Please put your code to control UART clock here if needed
177 */
178}
179
180static void __serial_clock_off(struct tty_struct *tty)
181{
182 /* TODO: Some chipset requires to disable UART clock on client
183 * side to save power consumption or manual work is required.
184 * Please put your code to control UART clock off here if needed
185 */
186}
187
188/* serial_clock_vote needs to be called with the ibs lock held */
189static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
190{
191 struct qca_data *qca = hu->priv;
192 unsigned int diff;
193
194 bool old_vote = (qca->tx_vote | qca->rx_vote);
195 bool new_vote;
196
197 switch (vote) {
198 case HCI_IBS_VOTE_STATS_UPDATE:
199 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
200
201 if (old_vote)
202 qca->vote_off_ms += diff;
203 else
204 qca->vote_on_ms += diff;
205 return;
206
207 case HCI_IBS_TX_VOTE_CLOCK_ON:
208 qca->tx_vote = true;
209 qca->tx_votes_on++;
210 new_vote = true;
211 break;
212
213 case HCI_IBS_RX_VOTE_CLOCK_ON:
214 qca->rx_vote = true;
215 qca->rx_votes_on++;
216 new_vote = true;
217 break;
218
219 case HCI_IBS_TX_VOTE_CLOCK_OFF:
220 qca->tx_vote = false;
221 qca->tx_votes_off++;
222 new_vote = qca->rx_vote | qca->tx_vote;
223 break;
224
225 case HCI_IBS_RX_VOTE_CLOCK_OFF:
226 qca->rx_vote = false;
227 qca->rx_votes_off++;
228 new_vote = qca->rx_vote | qca->tx_vote;
229 break;
230
231 default:
232 BT_ERR("Voting irregularity");
233 return;
234 }
235
236 if (new_vote != old_vote) {
237 if (new_vote)
238 __serial_clock_on(hu->tty);
239 else
240 __serial_clock_off(hu->tty);
241
ce26d813
PK		 242 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
243 vote ? "true" : "false");
0ff252c1
BYTK		 244
245 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
246
247 if (new_vote) {
248 qca->votes_on++;
249 qca->vote_off_ms += diff;
250 } else {
251 qca->votes_off++;
252 qca->vote_on_ms += diff;
253 }
254 qca->vote_last_jif = jiffies;
255 }
256}
257
258/* Builds and sends an HCI_IBS command packet.
259 * These are very simple packets with only 1 cmd byte.
260 */
261static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
262{
263 int err = 0;
264 struct sk_buff *skb = NULL;
265 struct qca_data *qca = hu->priv;
266
267 BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);
268
269 skb = bt_skb_alloc(1, GFP_ATOMIC);
270 if (!skb) {
271 BT_ERR("Failed to allocate memory for HCI_IBS packet");
272 return -ENOMEM;
273 }
274
275 /* Assign HCI_IBS type */
634fef61 276 skb_put_u8(skb, cmd);
0ff252c1
BYTK		 277
278 skb_queue_tail(&qca->txq, skb);
279
280 return err;
281}
282
283static void qca_wq_awake_device(struct work_struct *work)
284{
285 struct qca_data *qca = container_of(work, struct qca_data,
286 ws_awake_device);
287 struct hci_uart *hu = qca->hu;
288 unsigned long retrans_delay;
289
290 BT_DBG("hu %p wq awake device", hu);
291
292 /* Vote for serial clock */
293 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
294
295 spin_lock(&qca->hci_ibs_lock);
296
297 /* Send wake indication to device */
298 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
299 BT_ERR("Failed to send WAKE to device");
300
301 qca->ibs_sent_wakes++;
302
303 /* Start retransmit timer */
304 retrans_delay = msecs_to_jiffies(qca->wake_retrans);
305 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
306
307 spin_unlock(&qca->hci_ibs_lock);
308
309 /* Actually send the packets */
310 hci_uart_tx_wakeup(hu);
311}
312
313static void qca_wq_awake_rx(struct work_struct *work)
314{
315 struct qca_data *qca = container_of(work, struct qca_data,
316 ws_awake_rx);
317 struct hci_uart *hu = qca->hu;
318
319 BT_DBG("hu %p wq awake rx", hu);
320
321 serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
322
323 spin_lock(&qca->hci_ibs_lock);
324 qca->rx_ibs_state = HCI_IBS_RX_AWAKE;
325
326 /* Always acknowledge device wake up,
327 * sending IBS message doesn't count as TX ON.
328 */
329 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
330 BT_ERR("Failed to acknowledge device wake up");
331
332 qca->ibs_sent_wacks++;
333
334 spin_unlock(&qca->hci_ibs_lock);
335
336 /* Actually send the packets */
337 hci_uart_tx_wakeup(hu);
338}
339
340static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
341{
342 struct qca_data *qca = container_of(work, struct qca_data,
343 ws_rx_vote_off);
344 struct hci_uart *hu = qca->hu;
345
346 BT_DBG("hu %p rx clock vote off", hu);
347
348 serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
349}
350
351static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
352{
353 struct qca_data *qca = container_of(work, struct qca_data,
354 ws_tx_vote_off);
355 struct hci_uart *hu = qca->hu;
356
357 BT_DBG("hu %p tx clock vote off", hu);
358
359 /* Run HCI tx handling unlocked */
360 hci_uart_tx_wakeup(hu);
361
362 /* Now that message queued to tty driver, vote for tty clocks off.
363 * It is up to the tty driver to pend the clocks off until tx done.
364 */
365 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
366}
367
04356052 368static void hci_ibs_tx_idle_timeout(struct timer_list *t)
0ff252c1 369{
04356052
KC		 370 struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
371 struct hci_uart *hu = qca->hu;
0ff252c1
BYTK		 372 unsigned long flags;
373
374 BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);
375
376 spin_lock_irqsave_nested(&qca->hci_ibs_lock,
377 flags, SINGLE_DEPTH_NESTING);
378
379 switch (qca->tx_ibs_state) {
380 case HCI_IBS_TX_AWAKE:
381 /* TX_IDLE, go to SLEEP */
382 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
383 BT_ERR("Failed to send SLEEP to device");
384 break;
385 }
386 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
387 qca->ibs_sent_slps++;
388 queue_work(qca->workqueue, &qca->ws_tx_vote_off);
389 break;
390
391 case HCI_IBS_TX_ASLEEP:
392 case HCI_IBS_TX_WAKING:
393 /* Fall through */
394
395 default:
e059a465 396 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
0ff252c1
BYTK		 397 break;
398 }
399
400 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
401}
402
04356052 403static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
0ff252c1 404{
04356052
KC		 405 struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
406 struct hci_uart *hu = qca->hu;
0ff252c1 407 unsigned long flags, retrans_delay;
a9137188 408 bool retransmit = false;
0ff252c1
BYTK		 409
410 BT_DBG("hu %p wake retransmit timeout in %d state",
411 hu, qca->tx_ibs_state);
412
413 spin_lock_irqsave_nested(&qca->hci_ibs_lock,
414 flags, SINGLE_DEPTH_NESTING);
415
416 switch (qca->tx_ibs_state) {
417 case HCI_IBS_TX_WAKING:
418 /* No WAKE_ACK, retransmit WAKE */
a9137188 419 retransmit = true;
0ff252c1
BYTK		 420 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
421 BT_ERR("Failed to acknowledge device wake up");
422 break;
423 }
424 qca->ibs_sent_wakes++;
425 retrans_delay = msecs_to_jiffies(qca->wake_retrans);
426 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
427 break;
428
429 case HCI_IBS_TX_ASLEEP:
430 case HCI_IBS_TX_AWAKE:
431 /* Fall through */
432
433 default:
e059a465 434 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
0ff252c1
BYTK		 435 break;
436 }
437
438 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
439
440 if (retransmit)
441 hci_uart_tx_wakeup(hu);
442}
443
444/* Initialize protocol */
445static int qca_open(struct hci_uart *hu)
446{
05ba533c 447 struct qca_serdev *qcadev;
0ff252c1 448 struct qca_data *qca;
fa9ad876 449 int ret;
0ff252c1
BYTK		 450
451 BT_DBG("hu %p qca_open", hu);
452
25a13e38 453 qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
0ff252c1
BYTK		 454 if (!qca)
455 return -ENOMEM;
456
457 skb_queue_head_init(&qca->txq);
458 skb_queue_head_init(&qca->tx_wait_q);
459 spin_lock_init(&qca->hci_ibs_lock);
fac9a602 460 qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
0ff252c1
BYTK		 461 if (!qca->workqueue) {
462 BT_ERR("QCA Workqueue not initialized properly");
463 kfree(qca);
464 return -ENOMEM;
465 }
466
467 INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
468 INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
469 INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
470 INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
471
472 qca->hu = hu;
473
474 /* Assume we start with both sides asleep -- extra wakes OK */
475 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
476 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
477
478 /* clocks actually on, but we start votes off */
479 qca->tx_vote = false;
480 qca->rx_vote = false;
481 qca->flags = 0;
482
483 qca->ibs_sent_wacks = 0;
484 qca->ibs_sent_slps = 0;
485 qca->ibs_sent_wakes = 0;
486 qca->ibs_recv_wacks = 0;
487 qca->ibs_recv_slps = 0;
488 qca->ibs_recv_wakes = 0;
489 qca->vote_last_jif = jiffies;
490 qca->vote_on_ms = 0;
491 qca->vote_off_ms = 0;
492 qca->votes_on = 0;
493 qca->votes_off = 0;
494 qca->tx_votes_on = 0;
495 qca->tx_votes_off = 0;
496 qca->rx_votes_on = 0;
497 qca->rx_votes_off = 0;
498
499 hu->priv = qca;
500
05ba533c
TE		 501 if (hu->serdev) {
502 serdev_device_open(hu->serdev);
503
504 qcadev = serdev_device_get_drvdata(hu->serdev);
fa9ad876
BG		 505 if (qcadev->btsoc_type != QCA_WCN3990) {
506 gpiod_set_value_cansleep(qcadev->bt_en, 1);
507 } else {
508 hu->init_speed = qcadev->init_speed;
509 hu->oper_speed = qcadev->oper_speed;
510 ret = qca_power_setup(hu, true);
511 if (ret) {
512 destroy_workqueue(qca->workqueue);
513 kfree_skb(qca->rx_skb);
514 hu->priv = NULL;
515 kfree(qca);
516 return ret;
517 }
518 }
05ba533c
TE		 519 }
520
fa9ad876
BG		 521 timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
522 qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
523
524 timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
525 qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
526
0ff252c1
BYTK		 527 BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
528 qca->tx_idle_delay, qca->wake_retrans);
529
530 return 0;
531}
532
533static void qca_debugfs_init(struct hci_dev *hdev)
534{
535 struct hci_uart *hu = hci_get_drvdata(hdev);
536 struct qca_data *qca = hu->priv;
537 struct dentry *ibs_dir;
538 umode_t mode;
539
540 if (!hdev->debugfs)
541 return;
542
543 ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
544
545 /* read only */
546 mode = S_IRUGO;
547 debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
548 debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
549 debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
550 &qca->ibs_sent_slps);
551 debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
552 &qca->ibs_sent_wakes);
553 debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
554 &qca->ibs_sent_wacks);
555 debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
556 &qca->ibs_recv_slps);
557 debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
558 &qca->ibs_recv_wakes);
559 debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
560 &qca->ibs_recv_wacks);
10be6c0f 561 debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
0ff252c1
BYTK		 562 debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
563 debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
10be6c0f 564 debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
0ff252c1
BYTK		 565 debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
566 debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
567 debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
568 debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
569 debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
570 debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
571
572 /* read/write */
573 mode = S_IRUGO | S_IWUSR;
574 debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
575 debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
576 &qca->tx_idle_delay);
577}
578
579/* Flush protocol data */
580static int qca_flush(struct hci_uart *hu)
581{
582 struct qca_data *qca = hu->priv;
583
584 BT_DBG("hu %p qca flush", hu);
585
586 skb_queue_purge(&qca->tx_wait_q);
587 skb_queue_purge(&qca->txq);
588
589 return 0;
590}
591
592/* Close protocol */
593static int qca_close(struct hci_uart *hu)
594{
05ba533c 595 struct qca_serdev *qcadev;
0ff252c1
BYTK		 596 struct qca_data *qca = hu->priv;
597
598 BT_DBG("hu %p qca close", hu);
599
600 serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
601
602 skb_queue_purge(&qca->tx_wait_q);
603 skb_queue_purge(&qca->txq);
604 del_timer(&qca->tx_idle_timer);
605 del_timer(&qca->wake_retrans_timer);
606 destroy_workqueue(qca->workqueue);
607 qca->hu = NULL;
608
05ba533c 609 if (hu->serdev) {
05ba533c 610 qcadev = serdev_device_get_drvdata(hu->serdev);
fa9ad876
BG		 611 if (qcadev->btsoc_type == QCA_WCN3990)
612 qca_power_shutdown(hu->hdev);
613 else
614 gpiod_set_value_cansleep(qcadev->bt_en, 0);
615
616 serdev_device_close(hu->serdev);
05ba533c
TE		 617 }
618
0ff252c1
BYTK		 619 kfree_skb(qca->rx_skb);
620
621 hu->priv = NULL;
622
623 kfree(qca);
624
625 return 0;
626}
627
628/* Called upon a wake-up-indication from the device.
629 */
630static void device_want_to_wakeup(struct hci_uart *hu)
631{
632 unsigned long flags;
633 struct qca_data *qca = hu->priv;
634
635 BT_DBG("hu %p want to wake up", hu);
636
637 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
638
639 qca->ibs_recv_wakes++;
640
641 switch (qca->rx_ibs_state) {
642 case HCI_IBS_RX_ASLEEP:
643 /* Make sure clock is on - we may have turned clock off since
644 * receiving the wake up indicator awake rx clock.
645 */
646 queue_work(qca->workqueue, &qca->ws_awake_rx);
647 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
648 return;
649
650 case HCI_IBS_RX_AWAKE:
651 /* Always acknowledge device wake up,
652 * sending IBS message doesn't count as TX ON.
653 */
654 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
655 BT_ERR("Failed to acknowledge device wake up");
656 break;
657 }
658 qca->ibs_sent_wacks++;
659 break;
660
661 default:
662 /* Any other state is illegal */
663 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
664 qca->rx_ibs_state);
665 break;
666 }
667
668 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
669
670 /* Actually send the packets */
671 hci_uart_tx_wakeup(hu);
672}
673
674/* Called upon a sleep-indication from the device.
675 */
676static void device_want_to_sleep(struct hci_uart *hu)
677{
678 unsigned long flags;
679 struct qca_data *qca = hu->priv;
680
681 BT_DBG("hu %p want to sleep", hu);
682
683 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
684
685 qca->ibs_recv_slps++;
686
687 switch (qca->rx_ibs_state) {
688 case HCI_IBS_RX_AWAKE:
689 /* Update state */
690 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
691 /* Vote off rx clock under workqueue */
692 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
693 break;
694
695 case HCI_IBS_RX_ASLEEP:
696 /* Fall through */
697
698 default:
699 /* Any other state is illegal */
700 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
701 qca->rx_ibs_state);
702 break;
703 }
704
705 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
706}
707
708/* Called upon wake-up-acknowledgement from the device
709 */
710static void device_woke_up(struct hci_uart *hu)
711{
712 unsigned long flags, idle_delay;
713 struct qca_data *qca = hu->priv;
714 struct sk_buff *skb = NULL;
715
716 BT_DBG("hu %p woke up", hu);
717
718 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
719
720 qca->ibs_recv_wacks++;
721
722 switch (qca->tx_ibs_state) {
723 case HCI_IBS_TX_AWAKE:
724 /* Expect one if we send 2 WAKEs */
725 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
726 qca->tx_ibs_state);
727 break;
728
729 case HCI_IBS_TX_WAKING:
730 /* Send pending packets */
731 while ((skb = skb_dequeue(&qca->tx_wait_q)))
732 skb_queue_tail(&qca->txq, skb);
733
734 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
735 del_timer(&qca->wake_retrans_timer);
736 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
737 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
738 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
739 break;
740
741 case HCI_IBS_TX_ASLEEP:
742 /* Fall through */
743
744 default:
745 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
746 qca->tx_ibs_state);
747 break;
748 }
749
750 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
751
752 /* Actually send the packets */
753 hci_uart_tx_wakeup(hu);
754}
755
756/* Enqueue frame for transmittion (padding, crc, etc) may be called from
757 * two simultaneous tasklets.
758 */
759static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
760{
761 unsigned long flags = 0, idle_delay;
762 struct qca_data *qca = hu->priv;
763
764 BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
765 qca->tx_ibs_state);
766
767 /* Prepend skb with frame type */
618e8bc2 768 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
0ff252c1
BYTK		 769
770 /* Don't go to sleep in middle of patch download or
771 * Out-Of-Band(GPIOs control) sleep is selected.
772 */
773 if (!test_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags)) {
774 skb_queue_tail(&qca->txq, skb);
775 return 0;
776 }
777
778 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
779
780 /* Act according to current state */
781 switch (qca->tx_ibs_state) {
782 case HCI_IBS_TX_AWAKE:
783 BT_DBG("Device awake, sending normally");
784 skb_queue_tail(&qca->txq, skb);
785 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
786 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
787 break;
788
789 case HCI_IBS_TX_ASLEEP:
790 BT_DBG("Device asleep, waking up and queueing packet");
791 /* Save packet for later */
792 skb_queue_tail(&qca->tx_wait_q, skb);
793
794 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
795 /* Schedule a work queue to wake up device */
796 queue_work(qca->workqueue, &qca->ws_awake_device);
797 break;
798
799 case HCI_IBS_TX_WAKING:
800 BT_DBG("Device waking up, queueing packet");
801 /* Transient state; just keep packet for later */
802 skb_queue_tail(&qca->tx_wait_q, skb);
803 break;
804
805 default:
806 BT_ERR("Illegal tx state: %d (losing packet)",
807 qca->tx_ibs_state);
808 kfree_skb(skb);
809 break;
810 }
811
812 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
813
814 return 0;
815}
816
817static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
818{
819 struct hci_uart *hu = hci_get_drvdata(hdev);
820
821 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
822
823 device_want_to_sleep(hu);
824
825 kfree_skb(skb);
826 return 0;
827}
828
829static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
830{
831 struct hci_uart *hu = hci_get_drvdata(hdev);
832
833 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
834
835 device_want_to_wakeup(hu);
836
837 kfree_skb(skb);
838 return 0;
839}
840
841static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
842{
843 struct hci_uart *hu = hci_get_drvdata(hdev);
844
845 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
846
847 device_woke_up(hu);
848
849 kfree_skb(skb);
850 return 0;
851}
852
853#define QCA_IBS_SLEEP_IND_EVENT \
854 .type = HCI_IBS_SLEEP_IND, \
855 .hlen = 0, \
856 .loff = 0, \
857 .lsize = 0, \
858 .maxlen = HCI_MAX_IBS_SIZE
859
860#define QCA_IBS_WAKE_IND_EVENT \
861 .type = HCI_IBS_WAKE_IND, \
862 .hlen = 0, \
863 .loff = 0, \
864 .lsize = 0, \
865 .maxlen = HCI_MAX_IBS_SIZE
866
867#define QCA_IBS_WAKE_ACK_EVENT \
868 .type = HCI_IBS_WAKE_ACK, \
869 .hlen = 0, \
870 .loff = 0, \
871 .lsize = 0, \
872 .maxlen = HCI_MAX_IBS_SIZE
873
874static const struct h4_recv_pkt qca_recv_pkts[] = {
875 { H4_RECV_ACL, .recv = hci_recv_frame },
876 { H4_RECV_SCO, .recv = hci_recv_frame },
877 { H4_RECV_EVENT, .recv = hci_recv_frame },
878 { QCA_IBS_WAKE_IND_EVENT, .recv = qca_ibs_wake_ind },
879 { QCA_IBS_WAKE_ACK_EVENT, .recv = qca_ibs_wake_ack },
880 { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
881};
882
883static int qca_recv(struct hci_uart *hu, const void *data, int count)
884{
885 struct qca_data *qca = hu->priv;
886
887 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
888 return -EUNATCH;
889
890 qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
891 qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
892 if (IS_ERR(qca->rx_skb)) {
893 int err = PTR_ERR(qca->rx_skb);
2064ee33 894 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
0ff252c1
BYTK		 895 qca->rx_skb = NULL;
896 return err;
897 }
898
899 return count;
900}
901
902static struct sk_buff *qca_dequeue(struct hci_uart *hu)
903{
904 struct qca_data *qca = hu->priv;
905
906 return skb_dequeue(&qca->txq);
907}
908
909static uint8_t qca_get_baudrate_value(int speed)
910{
ce26d813 911 switch (speed) {
0ff252c1
BYTK		 912 case 9600:
913 return QCA_BAUDRATE_9600;
914 case 19200:
915 return QCA_BAUDRATE_19200;
916 case 38400:
917 return QCA_BAUDRATE_38400;
918 case 57600:
919 return QCA_BAUDRATE_57600;
920 case 115200:
921 return QCA_BAUDRATE_115200;
922 case 230400:
923 return QCA_BAUDRATE_230400;
924 case 460800:
925 return QCA_BAUDRATE_460800;
926 case 500000:
927 return QCA_BAUDRATE_500000;
928 case 921600:
929 return QCA_BAUDRATE_921600;
930 case 1000000:
931 return QCA_BAUDRATE_1000000;
932 case 2000000:
933 return QCA_BAUDRATE_2000000;
934 case 3000000:
935 return QCA_BAUDRATE_3000000;
be93a497
BG		 936 case 3200000:
937 return QCA_BAUDRATE_3200000;
0ff252c1
BYTK		 938 case 3500000:
939 return QCA_BAUDRATE_3500000;
940 default:
941 return QCA_BAUDRATE_115200;
942 }
943}
944
945static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
946{
947 struct hci_uart *hu = hci_get_drvdata(hdev);
948 struct qca_data *qca = hu->priv;
949 struct sk_buff *skb;
fa9ad876 950 struct qca_serdev *qcadev;
0ff252c1
BYTK		 951 u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
952
be93a497 953 if (baudrate > QCA_BAUDRATE_3200000)
0ff252c1
BYTK		 954 return -EINVAL;
955
956 cmd[4] = baudrate;
957
25a13e38 958 skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
0ff252c1 959 if (!skb) {
2064ee33 960 bt_dev_err(hdev, "Failed to allocate baudrate packet");
0ff252c1
BYTK		 961 return -ENOMEM;
962 }
963
fa9ad876
BG		 964 /* Disabling hardware flow control is mandatory while
965 * sending change baudrate request to wcn3990 SoC.
966 */
967 qcadev = serdev_device_get_drvdata(hu->serdev);
968 if (qcadev->btsoc_type == QCA_WCN3990)
969 hci_uart_set_flow_control(hu, true);
970
0ff252c1 971 /* Assign commands to change baudrate and packet type. */
59ae1d12 972 skb_put_data(skb, cmd, sizeof(cmd));
618e8bc2 973 hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
0ff252c1
BYTK		 974
975 skb_queue_tail(&qca->txq, skb);
976 hci_uart_tx_wakeup(hu);
977
978 /* wait 300ms to change new baudrate on controller side
979 * controller will come back after they receive this HCI command
980 * then host can communicate with new baudrate to controller
981 */
982 set_current_state(TASK_UNINTERRUPTIBLE);
983 schedule_timeout(msecs_to_jiffies(BAUDRATE_SETTLE_TIMEOUT_MS));
9960521c 984 set_current_state(TASK_RUNNING);
0ff252c1 985
fa9ad876
BG		 986 if (qcadev->btsoc_type == QCA_WCN3990)
987 hci_uart_set_flow_control(hu, false);
988
0ff252c1
BYTK		 989 return 0;
990}
991
05ba533c
TE		 992static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
993{
994 if (hu->serdev)
995 serdev_device_set_baudrate(hu->serdev, speed);
996 else
997 hci_uart_set_baudrate(hu, speed);
998}
999
fa9ad876
BG		 1000static int qca_send_power_pulse(struct hci_dev *hdev, u8 cmd)
1001{
1002 struct hci_uart *hu = hci_get_drvdata(hdev);
1003 struct qca_data *qca = hu->priv;
1004 struct sk_buff *skb;
1005
1006 /* These power pulses are single byte command which are sent
1007 * at required baudrate to wcn3990. On wcn3990, we have an external
1008 * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1009 * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1010 * and also we use the same power inputs to turn on and off for
1011 * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1012 * we send a power on pulse at 115200 bps. This algorithm will help to
1013 * save power. Disabling hardware flow control is mandatory while
1014 * sending power pulses to SoC.
1015 */
1016 bt_dev_dbg(hdev, "sending power pulse %02x to SoC", cmd);
1017
1018 skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
1019 if (!skb)
1020 return -ENOMEM;
1021
1022 hci_uart_set_flow_control(hu, true);
1023
1024 skb_put_u8(skb, cmd);
1025 hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1026
1027 skb_queue_tail(&qca->txq, skb);
1028 hci_uart_tx_wakeup(hu);
1029
1030 /* Wait for 100 uS for SoC to settle down */
1031 usleep_range(100, 200);
1032 hci_uart_set_flow_control(hu, false);
1033
1034 return 0;
1035}
1036
83d9c5e5
BG		 1037static unsigned int qca_get_speed(struct hci_uart *hu,
1038 enum qca_speed_type speed_type)
1039{
1040 unsigned int speed = 0;
1041
1042 if (speed_type == QCA_INIT_SPEED) {
1043 if (hu->init_speed)
1044 speed = hu->init_speed;
1045 else if (hu->proto->init_speed)
1046 speed = hu->proto->init_speed;
1047 } else {
1048 if (hu->oper_speed)
1049 speed = hu->oper_speed;
1050 else if (hu->proto->oper_speed)
1051 speed = hu->proto->oper_speed;
1052 }
1053
1054 return speed;
1055}
1056
1057static int qca_check_speeds(struct hci_uart *hu)
1058{
fa9ad876
BG		 1059 struct qca_serdev *qcadev;
1060
1061 qcadev = serdev_device_get_drvdata(hu->serdev);
1062 if (qcadev->btsoc_type == QCA_WCN3990) {
1063 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1064 !qca_get_speed(hu, QCA_OPER_SPEED))
1065 return -EINVAL;
1066 } else {
1067 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1068 !qca_get_speed(hu, QCA_OPER_SPEED))
1069 return -EINVAL;
1070 }
83d9c5e5
BG		 1071
1072 return 0;
1073}
1074
1075static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1076{
1077 unsigned int speed, qca_baudrate;
1078 int ret;
1079
1080 if (speed_type == QCA_INIT_SPEED) {
1081 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1082 if (speed)
1083 host_set_baudrate(hu, speed);
1084 } else {
1085 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1086 if (!speed)
1087 return 0;
1088
1089 qca_baudrate = qca_get_baudrate_value(speed);
fa9ad876 1090 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
83d9c5e5
BG		 1091 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1092 if (ret)
1093 return ret;
1094
1095 host_set_baudrate(hu, speed);
1096 }
1097
1098 return 0;
1099}
1100
fa9ad876
BG		 1101static int qca_wcn3990_init(struct hci_uart *hu)
1102{
1103 struct hci_dev *hdev = hu->hdev;
1104 int ret;
1105
1106 /* Forcefully enable wcn3990 to enter in to boot mode. */
1107 host_set_baudrate(hu, 2400);
1108 ret = qca_send_power_pulse(hdev, QCA_WCN3990_POWEROFF_PULSE);
1109 if (ret)
1110 return ret;
1111
1112 qca_set_speed(hu, QCA_INIT_SPEED);
1113 ret = qca_send_power_pulse(hdev, QCA_WCN3990_POWERON_PULSE);
1114 if (ret)
1115 return ret;
1116
1117 /* Wait for 100 ms for SoC to boot */
1118 msleep(100);
1119
1120 /* Now the device is in ready state to communicate with host.
1121 * To sync host with device we need to reopen port.
1122 * Without this, we will have RTS and CTS synchronization
1123 * issues.
1124 */
1125 serdev_device_close(hu->serdev);
1126 ret = serdev_device_open(hu->serdev);
1127 if (ret) {
1128 bt_dev_err(hu->hdev, "failed to open port");
1129 return ret;
1130 }
1131
1132 hci_uart_set_flow_control(hu, false);
1133
1134 return 0;
1135}
1136
0ff252c1
BYTK		 1137static int qca_setup(struct hci_uart *hu)
1138{
1139 struct hci_dev *hdev = hu->hdev;
1140 struct qca_data *qca = hu->priv;
1141 unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
fa9ad876 1142 struct qca_serdev *qcadev;
0ff252c1 1143 int ret;
aadebac4 1144 int soc_ver = 0;
0ff252c1 1145
fa9ad876 1146 qcadev = serdev_device_get_drvdata(hu->serdev);
0ff252c1 1147
83d9c5e5
BG		 1148 ret = qca_check_speeds(hu);
1149 if (ret)
1150 return ret;
1151
0ff252c1
BYTK		 1152 /* Patch downloading has to be done without IBS mode */
1153 clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1154
fa9ad876
BG		 1155 if (qcadev->btsoc_type == QCA_WCN3990) {
1156 bt_dev_info(hdev, "setting up wcn3990");
1157 ret = qca_wcn3990_init(hu);
1158 if (ret)
1159 return ret;
1160
1161 ret = qca_read_soc_version(hdev, &soc_ver);
1162 if (ret)
1163 return ret;
1164 } else {
1165 bt_dev_info(hdev, "ROME setup");
1166 qca_set_speed(hu, QCA_INIT_SPEED);
1167 }
0ff252c1
BYTK		 1168
1169 /* Setup user speed if needed */
83d9c5e5 1170 speed = qca_get_speed(hu, QCA_OPER_SPEED);
0ff252c1 1171 if (speed) {
83d9c5e5
BG		 1172 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1173 if (ret)
0ff252c1 1174 return ret;
83d9c5e5
BG		 1175
1176 qca_baudrate = qca_get_baudrate_value(speed);
0ff252c1
BYTK		 1177 }
1178
fa9ad876
BG		 1179 if (qcadev->btsoc_type != QCA_WCN3990) {
1180 /* Get QCA version information */
1181 ret = qca_read_soc_version(hdev, &soc_ver);
1182 if (ret)
1183 return ret;
1184 }
aadebac4
BG		 1185
1186 bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
0ff252c1 1187 /* Setup patch / NVM configurations */
fa9ad876 1188 ret = qca_uart_setup(hdev, qca_baudrate, qcadev->btsoc_type, soc_ver);
0ff252c1
BYTK		 1189 if (!ret) {
1190 set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1191 qca_debugfs_init(hdev);
ba8f3597
LP		 1192 } else if (ret == -ENOENT) {
1193 /* No patch/nvm-config found, run with original fw/config */
1194 ret = 0;
7dc5fe08
AP		 1195 } else if (ret == -EAGAIN) {
1196 /*
1197 * Userspace firmware loader will return -EAGAIN in case no
1198 * patch/nvm-config is found, so run with original fw/config.
1199 */
1200 ret = 0;
0ff252c1
BYTK		 1201 }
1202
1203 /* Setup bdaddr */
1204 hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1205
1206 return ret;
1207}
1208
1209static struct hci_uart_proto qca_proto = {
1210 .id = HCI_UART_QCA,
1211 .name = "QCA",
aee61f7a 1212 .manufacturer = 29,
0ff252c1
BYTK		 1213 .init_speed = 115200,
1214 .oper_speed = 3000000,
1215 .open = qca_open,
1216 .close = qca_close,
1217 .flush = qca_flush,
1218 .setup = qca_setup,
1219 .recv = qca_recv,
1220 .enqueue = qca_enqueue,
1221 .dequeue = qca_dequeue,
1222};
1223
fa9ad876
BG		 1224static const struct qca_vreg_data qca_soc_data = {
1225 .soc_type = QCA_WCN3990,
1226 .vregs = (struct qca_vreg []) {
1227 { "vddio", 1800000, 1900000, 15000 },
1228 { "vddxo", 1800000, 1900000, 80000 },
1229 { "vddrf", 1300000, 1350000, 300000 },
1230 { "vddch0", 3300000, 3400000, 450000 },
1231 },
1232 .num_vregs = 4,
1233};
1234
1235static void qca_power_shutdown(struct hci_dev *hdev)
1236{
1237 struct hci_uart *hu = hci_get_drvdata(hdev);
1238
1239 host_set_baudrate(hu, 2400);
1240 qca_send_power_pulse(hdev, QCA_WCN3990_POWEROFF_PULSE);
1241 qca_power_setup(hu, false);
1242}
1243
1244static int qca_enable_regulator(struct qca_vreg vregs,
1245 struct regulator *regulator)
1246{
1247 int ret;
1248
1249 ret = regulator_set_voltage(regulator, vregs.min_uV,
1250 vregs.max_uV);
1251 if (ret)
1252 return ret;
1253
1254 if (vregs.load_uA)
1255 ret = regulator_set_load(regulator,
1256 vregs.load_uA);
1257
1258 if (ret)
1259 return ret;
1260
1261 return regulator_enable(regulator);
1262
1263}
1264
1265static void qca_disable_regulator(struct qca_vreg vregs,
1266 struct regulator *regulator)
1267{
1268 regulator_disable(regulator);
1269 regulator_set_voltage(regulator, 0, vregs.max_uV);
1270 if (vregs.load_uA)
1271 regulator_set_load(regulator, 0);
1272
1273}
1274
1275static int qca_power_setup(struct hci_uart *hu, bool on)
1276{
1277 struct qca_vreg *vregs;
1278 struct regulator_bulk_data *vreg_bulk;
1279 struct qca_serdev *qcadev;
1280 int i, num_vregs, ret = 0;
1281
1282 qcadev = serdev_device_get_drvdata(hu->serdev);
1283 if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data ||
1284 !qcadev->bt_power->vreg_bulk)
1285 return -EINVAL;
1286
1287 vregs = qcadev->bt_power->vreg_data->vregs;
1288 vreg_bulk = qcadev->bt_power->vreg_bulk;
1289 num_vregs = qcadev->bt_power->vreg_data->num_vregs;
1290 BT_DBG("on: %d", on);
1291 if (on && !qcadev->bt_power->vregs_on) {
1292 for (i = 0; i < num_vregs; i++) {
1293 ret = qca_enable_regulator(vregs[i],
1294 vreg_bulk[i].consumer);
1295 if (ret)
1296 break;
1297 }
1298
1299 if (ret) {
1300 BT_ERR("failed to enable regulator:%s", vregs[i].name);
1301 /* turn off regulators which are enabled */
1302 for (i = i - 1; i >= 0; i--)
1303 qca_disable_regulator(vregs[i],
1304 vreg_bulk[i].consumer);
1305 } else {
1306 qcadev->bt_power->vregs_on = true;
1307 }
1308 } else if (!on && qcadev->bt_power->vregs_on) {
1309 /* turn off regulator in reverse order */
1310 i = qcadev->bt_power->vreg_data->num_vregs - 1;
1311 for ( ; i >= 0; i--)
1312 qca_disable_regulator(vregs[i], vreg_bulk[i].consumer);
1313
1314 qcadev->bt_power->vregs_on = false;
1315 }
1316
1317 return ret;
1318}
1319
1320static int qca_init_regulators(struct qca_power *qca,
1321 const struct qca_vreg *vregs, size_t num_vregs)
1322{
1323 int i;
1324
1325 qca->vreg_bulk = devm_kzalloc(qca->dev, num_vregs *
1326 sizeof(struct regulator_bulk_data),
1327 GFP_KERNEL);
1328 if (!qca->vreg_bulk)
1329 return -ENOMEM;
1330
1331 for (i = 0; i < num_vregs; i++)
1332 qca->vreg_bulk[i].supply = vregs[i].name;
1333
1334 return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk);
1335}
1336
05ba533c
TE		 1337static int qca_serdev_probe(struct serdev_device *serdev)
1338{
1339 struct qca_serdev *qcadev;
fa9ad876 1340 const struct qca_vreg_data *data;
05ba533c
TE		 1341 int err;
1342
1343 qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1344 if (!qcadev)
1345 return -ENOMEM;
1346
1347 qcadev->serdev_hu.serdev = serdev;
fa9ad876 1348 data = of_device_get_match_data(&serdev->dev);
05ba533c 1349 serdev_device_set_drvdata(serdev, qcadev);
fa9ad876
BG		 1350 if (data && data->soc_type == QCA_WCN3990) {
1351 qcadev->btsoc_type = QCA_WCN3990;
1352 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1353 sizeof(struct qca_power),
1354 GFP_KERNEL);
1355 if (!qcadev->bt_power)
1356 return -ENOMEM;
1357
1358 qcadev->bt_power->dev = &serdev->dev;
1359 qcadev->bt_power->vreg_data = data;
1360 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1361 data->num_vregs);
1362 if (err) {
1363 BT_ERR("Failed to init regulators:%d", err);
1364 goto out;
1365 }
05ba533c 1366
fa9ad876 1367 qcadev->bt_power->vregs_on = false;
05ba533c 1368
fa9ad876
BG		 1369 device_property_read_u32(&serdev->dev, "max-speed",
1370 &qcadev->oper_speed);
1371 if (!qcadev->oper_speed)
1372 BT_DBG("UART will pick default operating speed");
05ba533c 1373
fa9ad876
BG		 1374 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1375 if (err) {
1376 BT_ERR("wcn3990 serdev registration failed");
1377 goto out;
1378 }
1379 } else {
1380 qcadev->btsoc_type = QCA_ROME;
1381 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
1382 GPIOD_OUT_LOW);
1383 if (IS_ERR(qcadev->bt_en)) {
1384 dev_err(&serdev->dev, "failed to acquire enable gpio\n");
1385 return PTR_ERR(qcadev->bt_en);
1386 }
05ba533c 1387
fa9ad876
BG		 1388 qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
1389 if (IS_ERR(qcadev->susclk)) {
1390 dev_err(&serdev->dev, "failed to acquire clk\n");
1391 return PTR_ERR(qcadev->susclk);
1392 }
05ba533c 1393
fa9ad876
BG		 1394 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
1395 if (err)
1396 return err;
1397
1398 err = clk_prepare_enable(qcadev->susclk);
1399 if (err)
1400 return err;
1401
1402 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1403 if (err)
1404 clk_disable_unprepare(qcadev->susclk);
1405 }
1406
1407out: return err;
05ba533c 1408
05ba533c
TE		 1409}
1410
1411static void qca_serdev_remove(struct serdev_device *serdev)
1412{
1413 struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
1414
fa9ad876
BG		 1415 if (qcadev->btsoc_type == QCA_WCN3990)
1416 qca_power_shutdown(qcadev->serdev_hu.hdev);
1417 else
1418 clk_disable_unprepare(qcadev->susclk);
05ba533c 1419
fa9ad876 1420 hci_uart_unregister_device(&qcadev->serdev_hu);
05ba533c
TE		 1421}
1422
1423static const struct of_device_id qca_bluetooth_of_match[] = {
1424 { .compatible = "qcom,qca6174-bt" },
fa9ad876 1425 { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data},
05ba533c
TE		 1426 { /* sentinel */ }
1427};
1428MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
1429
1430static struct serdev_device_driver qca_serdev_driver = {
1431 .probe = qca_serdev_probe,
1432 .remove = qca_serdev_remove,
1433 .driver = {
1434 .name = "hci_uart_qca",
1435 .of_match_table = qca_bluetooth_of_match,
1436 },
1437};
1438
0ff252c1
BYTK		 1439int __init qca_init(void)
1440{
05ba533c
TE		 1441 serdev_device_driver_register(&qca_serdev_driver);
1442
0ff252c1
BYTK		 1443 return hci_uart_register_proto(&qca_proto);
1444}
1445
1446int __exit qca_deinit(void)
1447{
05ba533c
TE		 1448 serdev_device_driver_unregister(&qca_serdev_driver);
1449
0ff252c1
BYTK		 1450 return hci_uart_unregister_proto(&qca_proto);
1451}
Linux 6.x block layer and io_uring tree(s)