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
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
54 #define HCI_MAX_IBS_SIZE 10
55
56 /* Controller states */
57 #define STATE_IN_BAND_SLEEP_ENABLED 1
58
59 #define IBS_WAKE_RETRANS_TIMEOUT_MS 100
60 #define IBS_TX_IDLE_TIMEOUT_MS 2000
61 #define BAUDRATE_SETTLE_TIMEOUT_MS 300
62
63 /* susclk rate */
64 #define SUSCLK_RATE_32KHZ 32768
65
66 /* HCI_IBS transmit side sleep protocol states */
67 enum 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 */
74 enum rx_states {
75 HCI_IBS_RX_ASLEEP,
76 HCI_IBS_RX_AWAKE,
77 };
78
79 /* HCI_IBS transmit and receive side clock state vote */
80 enum 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
88 struct 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 */
96 bool tx_vote; /* Clock must be on for TX */
97 bool rx_vote; /* Clock must be on for RX */
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
127 enum qca_speed_type {
128 QCA_INIT_SPEED = 1,
129 QCA_OPER_SPEED
130 };
131
132 /*
133 * Voltage regulator information required for configuring the
134 * QCA Bluetooth chipset
135 */
136 struct qca_vreg {
137 const char *name;
138 unsigned int min_uV;
139 unsigned int max_uV;
140 unsigned int load_uA;
141 };
142
143 struct 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 */
152 struct 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
159 struct qca_serdev {
160 struct hci_uart serdev_hu;
161 struct gpio_desc *bt_en;
162 struct clk *susclk;
163 enum qca_btsoc_type btsoc_type;
164 struct qca_power *bt_power;
165 u32 init_speed;
166 u32 oper_speed;
167 };
168
169 static int qca_power_setup(struct hci_uart *hu, bool on);
170 static void qca_power_shutdown(struct hci_uart *hu);
171
__serial_clock_on(struct tty_struct * tty)172 static 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
__serial_clock_off(struct tty_struct * tty)180 static 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 */
serial_clock_vote(unsigned long vote,struct hci_uart * hu)189 static 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
242 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
243 vote ? "true" : "false");
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 */
send_hci_ibs_cmd(u8 cmd,struct hci_uart * hu)261 static 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 */
276 skb_put_u8(skb, cmd);
277
278 skb_queue_tail(&qca->txq, skb);
279
280 return err;
281 }
282
qca_wq_awake_device(struct work_struct * work)283 static 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
qca_wq_awake_rx(struct work_struct * work)313 static 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
qca_wq_serial_rx_clock_vote_off(struct work_struct * work)340 static 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
qca_wq_serial_tx_clock_vote_off(struct work_struct * work)351 static 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
hci_ibs_tx_idle_timeout(struct timer_list * t)368 static void hci_ibs_tx_idle_timeout(struct timer_list *t)
369 {
370 struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
371 struct hci_uart *hu = qca->hu;
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:
396 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
397 break;
398 }
399
400 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
401 }
402
hci_ibs_wake_retrans_timeout(struct timer_list * t)403 static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
404 {
405 struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
406 struct hci_uart *hu = qca->hu;
407 unsigned long flags, retrans_delay;
408 bool retransmit = false;
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 */
419 retransmit = true;
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:
434 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
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 */
qca_open(struct hci_uart * hu)445 static int qca_open(struct hci_uart *hu)
446 {
447 struct qca_serdev *qcadev;
448 struct qca_data *qca;
449 int ret;
450
451 BT_DBG("hu %p qca_open", hu);
452
453 if (!hci_uart_has_flow_control(hu))
454 return -EOPNOTSUPP;
455
456 qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
457 if (!qca)
458 return -ENOMEM;
459
460 skb_queue_head_init(&qca->txq);
461 skb_queue_head_init(&qca->tx_wait_q);
462 spin_lock_init(&qca->hci_ibs_lock);
463 qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
464 if (!qca->workqueue) {
465 BT_ERR("QCA Workqueue not initialized properly");
466 kfree(qca);
467 return -ENOMEM;
468 }
469
470 INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
471 INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
472 INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
473 INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
474
475 qca->hu = hu;
476
477 /* Assume we start with both sides asleep -- extra wakes OK */
478 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
479 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
480
481 /* clocks actually on, but we start votes off */
482 qca->tx_vote = false;
483 qca->rx_vote = false;
484 qca->flags = 0;
485
486 qca->ibs_sent_wacks = 0;
487 qca->ibs_sent_slps = 0;
488 qca->ibs_sent_wakes = 0;
489 qca->ibs_recv_wacks = 0;
490 qca->ibs_recv_slps = 0;
491 qca->ibs_recv_wakes = 0;
492 qca->vote_last_jif = jiffies;
493 qca->vote_on_ms = 0;
494 qca->vote_off_ms = 0;
495 qca->votes_on = 0;
496 qca->votes_off = 0;
497 qca->tx_votes_on = 0;
498 qca->tx_votes_off = 0;
499 qca->rx_votes_on = 0;
500 qca->rx_votes_off = 0;
501
502 hu->priv = qca;
503
504 if (hu->serdev) {
505 serdev_device_open(hu->serdev);
506
507 qcadev = serdev_device_get_drvdata(hu->serdev);
508 if (qcadev->btsoc_type != QCA_WCN3990) {
509 gpiod_set_value_cansleep(qcadev->bt_en, 1);
510 /* Controller needs time to bootup. */
511 msleep(150);
512 } else {
513 hu->init_speed = qcadev->init_speed;
514 hu->oper_speed = qcadev->oper_speed;
515 ret = qca_power_setup(hu, true);
516 if (ret) {
517 destroy_workqueue(qca->workqueue);
518 kfree_skb(qca->rx_skb);
519 hu->priv = NULL;
520 kfree(qca);
521 return ret;
522 }
523 }
524 }
525
526 timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
527 qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
528
529 timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
530 qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
531
532 BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
533 qca->tx_idle_delay, qca->wake_retrans);
534
535 return 0;
536 }
537
qca_debugfs_init(struct hci_dev * hdev)538 static void qca_debugfs_init(struct hci_dev *hdev)
539 {
540 struct hci_uart *hu = hci_get_drvdata(hdev);
541 struct qca_data *qca = hu->priv;
542 struct dentry *ibs_dir;
543 umode_t mode;
544
545 if (!hdev->debugfs)
546 return;
547
548 ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
549
550 /* read only */
551 mode = S_IRUGO;
552 debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
553 debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
554 debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
555 &qca->ibs_sent_slps);
556 debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
557 &qca->ibs_sent_wakes);
558 debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
559 &qca->ibs_sent_wacks);
560 debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
561 &qca->ibs_recv_slps);
562 debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
563 &qca->ibs_recv_wakes);
564 debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
565 &qca->ibs_recv_wacks);
566 debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
567 debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
568 debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
569 debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
570 debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
571 debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
572 debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
573 debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
574 debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
575 debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
576
577 /* read/write */
578 mode = S_IRUGO | S_IWUSR;
579 debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
580 debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
581 &qca->tx_idle_delay);
582 }
583
584 /* Flush protocol data */
qca_flush(struct hci_uart * hu)585 static int qca_flush(struct hci_uart *hu)
586 {
587 struct qca_data *qca = hu->priv;
588
589 BT_DBG("hu %p qca flush", hu);
590
591 skb_queue_purge(&qca->tx_wait_q);
592 skb_queue_purge(&qca->txq);
593
594 return 0;
595 }
596
597 /* Close protocol */
qca_close(struct hci_uart * hu)598 static int qca_close(struct hci_uart *hu)
599 {
600 struct qca_serdev *qcadev;
601 struct qca_data *qca = hu->priv;
602
603 BT_DBG("hu %p qca close", hu);
604
605 serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
606
607 skb_queue_purge(&qca->tx_wait_q);
608 skb_queue_purge(&qca->txq);
609 del_timer(&qca->tx_idle_timer);
610 del_timer(&qca->wake_retrans_timer);
611 destroy_workqueue(qca->workqueue);
612 qca->hu = NULL;
613
614 if (hu->serdev) {
615 qcadev = serdev_device_get_drvdata(hu->serdev);
616 if (qcadev->btsoc_type == QCA_WCN3990)
617 qca_power_shutdown(hu);
618 else
619 gpiod_set_value_cansleep(qcadev->bt_en, 0);
620
621 serdev_device_close(hu->serdev);
622 }
623
624 kfree_skb(qca->rx_skb);
625
626 hu->priv = NULL;
627
628 kfree(qca);
629
630 return 0;
631 }
632
633 /* Called upon a wake-up-indication from the device.
634 */
device_want_to_wakeup(struct hci_uart * hu)635 static void device_want_to_wakeup(struct hci_uart *hu)
636 {
637 unsigned long flags;
638 struct qca_data *qca = hu->priv;
639
640 BT_DBG("hu %p want to wake up", hu);
641
642 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
643
644 qca->ibs_recv_wakes++;
645
646 switch (qca->rx_ibs_state) {
647 case HCI_IBS_RX_ASLEEP:
648 /* Make sure clock is on - we may have turned clock off since
649 * receiving the wake up indicator awake rx clock.
650 */
651 queue_work(qca->workqueue, &qca->ws_awake_rx);
652 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
653 return;
654
655 case HCI_IBS_RX_AWAKE:
656 /* Always acknowledge device wake up,
657 * sending IBS message doesn't count as TX ON.
658 */
659 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
660 BT_ERR("Failed to acknowledge device wake up");
661 break;
662 }
663 qca->ibs_sent_wacks++;
664 break;
665
666 default:
667 /* Any other state is illegal */
668 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
669 qca->rx_ibs_state);
670 break;
671 }
672
673 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
674
675 /* Actually send the packets */
676 hci_uart_tx_wakeup(hu);
677 }
678
679 /* Called upon a sleep-indication from the device.
680 */
device_want_to_sleep(struct hci_uart * hu)681 static void device_want_to_sleep(struct hci_uart *hu)
682 {
683 unsigned long flags;
684 struct qca_data *qca = hu->priv;
685
686 BT_DBG("hu %p want to sleep", hu);
687
688 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
689
690 qca->ibs_recv_slps++;
691
692 switch (qca->rx_ibs_state) {
693 case HCI_IBS_RX_AWAKE:
694 /* Update state */
695 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
696 /* Vote off rx clock under workqueue */
697 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
698 break;
699
700 case HCI_IBS_RX_ASLEEP:
701 /* Fall through */
702
703 default:
704 /* Any other state is illegal */
705 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
706 qca->rx_ibs_state);
707 break;
708 }
709
710 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
711 }
712
713 /* Called upon wake-up-acknowledgement from the device
714 */
device_woke_up(struct hci_uart * hu)715 static void device_woke_up(struct hci_uart *hu)
716 {
717 unsigned long flags, idle_delay;
718 struct qca_data *qca = hu->priv;
719 struct sk_buff *skb = NULL;
720
721 BT_DBG("hu %p woke up", hu);
722
723 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
724
725 qca->ibs_recv_wacks++;
726
727 switch (qca->tx_ibs_state) {
728 case HCI_IBS_TX_AWAKE:
729 /* Expect one if we send 2 WAKEs */
730 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
731 qca->tx_ibs_state);
732 break;
733
734 case HCI_IBS_TX_WAKING:
735 /* Send pending packets */
736 while ((skb = skb_dequeue(&qca->tx_wait_q)))
737 skb_queue_tail(&qca->txq, skb);
738
739 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
740 del_timer(&qca->wake_retrans_timer);
741 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
742 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
743 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
744 break;
745
746 case HCI_IBS_TX_ASLEEP:
747 /* Fall through */
748
749 default:
750 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
751 qca->tx_ibs_state);
752 break;
753 }
754
755 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
756
757 /* Actually send the packets */
758 hci_uart_tx_wakeup(hu);
759 }
760
761 /* Enqueue frame for transmittion (padding, crc, etc) may be called from
762 * two simultaneous tasklets.
763 */
qca_enqueue(struct hci_uart * hu,struct sk_buff * skb)764 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
765 {
766 unsigned long flags = 0, idle_delay;
767 struct qca_data *qca = hu->priv;
768
769 BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
770 qca->tx_ibs_state);
771
772 /* Prepend skb with frame type */
773 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
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 return 0;
781 }
782
783 spin_lock_irqsave(&qca->hci_ibs_lock, flags);
784
785 /* Act according to current state */
786 switch (qca->tx_ibs_state) {
787 case HCI_IBS_TX_AWAKE:
788 BT_DBG("Device awake, sending normally");
789 skb_queue_tail(&qca->txq, skb);
790 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
791 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
792 break;
793
794 case HCI_IBS_TX_ASLEEP:
795 BT_DBG("Device asleep, waking up and queueing packet");
796 /* Save packet for later */
797 skb_queue_tail(&qca->tx_wait_q, skb);
798
799 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
800 /* Schedule a work queue to wake up device */
801 queue_work(qca->workqueue, &qca->ws_awake_device);
802 break;
803
804 case HCI_IBS_TX_WAKING:
805 BT_DBG("Device waking up, queueing packet");
806 /* Transient state; just keep packet for later */
807 skb_queue_tail(&qca->tx_wait_q, skb);
808 break;
809
810 default:
811 BT_ERR("Illegal tx state: %d (losing packet)",
812 qca->tx_ibs_state);
813 dev_kfree_skb_irq(skb);
814 break;
815 }
816
817 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
818
819 return 0;
820 }
821
qca_ibs_sleep_ind(struct hci_dev * hdev,struct sk_buff * skb)822 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
823 {
824 struct hci_uart *hu = hci_get_drvdata(hdev);
825
826 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
827
828 device_want_to_sleep(hu);
829
830 kfree_skb(skb);
831 return 0;
832 }
833
qca_ibs_wake_ind(struct hci_dev * hdev,struct sk_buff * skb)834 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
835 {
836 struct hci_uart *hu = hci_get_drvdata(hdev);
837
838 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
839
840 device_want_to_wakeup(hu);
841
842 kfree_skb(skb);
843 return 0;
844 }
845
qca_ibs_wake_ack(struct hci_dev * hdev,struct sk_buff * skb)846 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
847 {
848 struct hci_uart *hu = hci_get_drvdata(hdev);
849
850 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
851
852 device_woke_up(hu);
853
854 kfree_skb(skb);
855 return 0;
856 }
857
858 #define QCA_IBS_SLEEP_IND_EVENT \
859 .type = HCI_IBS_SLEEP_IND, \
860 .hlen = 0, \
861 .loff = 0, \
862 .lsize = 0, \
863 .maxlen = HCI_MAX_IBS_SIZE
864
865 #define QCA_IBS_WAKE_IND_EVENT \
866 .type = HCI_IBS_WAKE_IND, \
867 .hlen = 0, \
868 .loff = 0, \
869 .lsize = 0, \
870 .maxlen = HCI_MAX_IBS_SIZE
871
872 #define QCA_IBS_WAKE_ACK_EVENT \
873 .type = HCI_IBS_WAKE_ACK, \
874 .hlen = 0, \
875 .loff = 0, \
876 .lsize = 0, \
877 .maxlen = HCI_MAX_IBS_SIZE
878
879 static const struct h4_recv_pkt qca_recv_pkts[] = {
880 { H4_RECV_ACL, .recv = hci_recv_frame },
881 { H4_RECV_SCO, .recv = hci_recv_frame },
882 { H4_RECV_EVENT, .recv = hci_recv_frame },
883 { QCA_IBS_WAKE_IND_EVENT, .recv = qca_ibs_wake_ind },
884 { QCA_IBS_WAKE_ACK_EVENT, .recv = qca_ibs_wake_ack },
885 { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
886 };
887
qca_recv(struct hci_uart * hu,const void * data,int count)888 static int qca_recv(struct hci_uart *hu, const void *data, int count)
889 {
890 struct qca_data *qca = hu->priv;
891
892 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
893 return -EUNATCH;
894
895 qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
896 qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
897 if (IS_ERR(qca->rx_skb)) {
898 int err = PTR_ERR(qca->rx_skb);
899 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
900 qca->rx_skb = NULL;
901 return err;
902 }
903
904 return count;
905 }
906
qca_dequeue(struct hci_uart * hu)907 static struct sk_buff *qca_dequeue(struct hci_uart *hu)
908 {
909 struct qca_data *qca = hu->priv;
910
911 return skb_dequeue(&qca->txq);
912 }
913
qca_get_baudrate_value(int speed)914 static uint8_t qca_get_baudrate_value(int speed)
915 {
916 switch (speed) {
917 case 9600:
918 return QCA_BAUDRATE_9600;
919 case 19200:
920 return QCA_BAUDRATE_19200;
921 case 38400:
922 return QCA_BAUDRATE_38400;
923 case 57600:
924 return QCA_BAUDRATE_57600;
925 case 115200:
926 return QCA_BAUDRATE_115200;
927 case 230400:
928 return QCA_BAUDRATE_230400;
929 case 460800:
930 return QCA_BAUDRATE_460800;
931 case 500000:
932 return QCA_BAUDRATE_500000;
933 case 921600:
934 return QCA_BAUDRATE_921600;
935 case 1000000:
936 return QCA_BAUDRATE_1000000;
937 case 2000000:
938 return QCA_BAUDRATE_2000000;
939 case 3000000:
940 return QCA_BAUDRATE_3000000;
941 case 3200000:
942 return QCA_BAUDRATE_3200000;
943 case 3500000:
944 return QCA_BAUDRATE_3500000;
945 default:
946 return QCA_BAUDRATE_115200;
947 }
948 }
949
qca_set_baudrate(struct hci_dev * hdev,uint8_t baudrate)950 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
951 {
952 struct hci_uart *hu = hci_get_drvdata(hdev);
953 struct qca_data *qca = hu->priv;
954 struct sk_buff *skb;
955 struct qca_serdev *qcadev;
956 u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
957
958 if (baudrate > QCA_BAUDRATE_3200000)
959 return -EINVAL;
960
961 cmd[4] = baudrate;
962
963 skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
964 if (!skb) {
965 bt_dev_err(hdev, "Failed to allocate baudrate packet");
966 return -ENOMEM;
967 }
968
969 /* Disabling hardware flow control is mandatory while
970 * sending change baudrate request to wcn3990 SoC.
971 */
972 qcadev = serdev_device_get_drvdata(hu->serdev);
973 if (qcadev->btsoc_type == QCA_WCN3990)
974 hci_uart_set_flow_control(hu, true);
975
976 /* Assign commands to change baudrate and packet type. */
977 skb_put_data(skb, cmd, sizeof(cmd));
978 hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
979
980 skb_queue_tail(&qca->txq, skb);
981 hci_uart_tx_wakeup(hu);
982
983 /* wait 300ms to change new baudrate on controller side
984 * controller will come back after they receive this HCI command
985 * then host can communicate with new baudrate to controller
986 */
987 set_current_state(TASK_UNINTERRUPTIBLE);
988 schedule_timeout(msecs_to_jiffies(BAUDRATE_SETTLE_TIMEOUT_MS));
989 set_current_state(TASK_RUNNING);
990
991 if (qcadev->btsoc_type == QCA_WCN3990)
992 hci_uart_set_flow_control(hu, false);
993
994 return 0;
995 }
996
host_set_baudrate(struct hci_uart * hu,unsigned int speed)997 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
998 {
999 if (hu->serdev)
1000 serdev_device_set_baudrate(hu->serdev, speed);
1001 else
1002 hci_uart_set_baudrate(hu, speed);
1003 }
1004
qca_send_power_pulse(struct hci_dev * hdev,u8 cmd)1005 static int qca_send_power_pulse(struct hci_dev *hdev, u8 cmd)
1006 {
1007 struct hci_uart *hu = hci_get_drvdata(hdev);
1008 struct qca_data *qca = hu->priv;
1009 struct sk_buff *skb;
1010
1011 /* These power pulses are single byte command which are sent
1012 * at required baudrate to wcn3990. On wcn3990, we have an external
1013 * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1014 * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1015 * and also we use the same power inputs to turn on and off for
1016 * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1017 * we send a power on pulse at 115200 bps. This algorithm will help to
1018 * save power. Disabling hardware flow control is mandatory while
1019 * sending power pulses to SoC.
1020 */
1021 bt_dev_dbg(hdev, "sending power pulse %02x to SoC", cmd);
1022
1023 skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
1024 if (!skb)
1025 return -ENOMEM;
1026
1027 hci_uart_set_flow_control(hu, true);
1028
1029 skb_put_u8(skb, cmd);
1030 hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1031
1032 skb_queue_tail(&qca->txq, skb);
1033 hci_uart_tx_wakeup(hu);
1034
1035 /* Wait for 100 uS for SoC to settle down */
1036 usleep_range(100, 200);
1037 hci_uart_set_flow_control(hu, false);
1038
1039 return 0;
1040 }
1041
qca_get_speed(struct hci_uart * hu,enum qca_speed_type speed_type)1042 static unsigned int qca_get_speed(struct hci_uart *hu,
1043 enum qca_speed_type speed_type)
1044 {
1045 unsigned int speed = 0;
1046
1047 if (speed_type == QCA_INIT_SPEED) {
1048 if (hu->init_speed)
1049 speed = hu->init_speed;
1050 else if (hu->proto->init_speed)
1051 speed = hu->proto->init_speed;
1052 } else {
1053 if (hu->oper_speed)
1054 speed = hu->oper_speed;
1055 else if (hu->proto->oper_speed)
1056 speed = hu->proto->oper_speed;
1057 }
1058
1059 return speed;
1060 }
1061
qca_check_speeds(struct hci_uart * hu)1062 static int qca_check_speeds(struct hci_uart *hu)
1063 {
1064 struct qca_serdev *qcadev;
1065
1066 qcadev = serdev_device_get_drvdata(hu->serdev);
1067 if (qcadev->btsoc_type == QCA_WCN3990) {
1068 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1069 !qca_get_speed(hu, QCA_OPER_SPEED))
1070 return -EINVAL;
1071 } else {
1072 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1073 !qca_get_speed(hu, QCA_OPER_SPEED))
1074 return -EINVAL;
1075 }
1076
1077 return 0;
1078 }
1079
qca_set_speed(struct hci_uart * hu,enum qca_speed_type speed_type)1080 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1081 {
1082 unsigned int speed, qca_baudrate;
1083 int ret;
1084
1085 if (speed_type == QCA_INIT_SPEED) {
1086 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1087 if (speed)
1088 host_set_baudrate(hu, speed);
1089 } else {
1090 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1091 if (!speed)
1092 return 0;
1093
1094 qca_baudrate = qca_get_baudrate_value(speed);
1095 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1096 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1097 if (ret)
1098 return ret;
1099
1100 host_set_baudrate(hu, speed);
1101 }
1102
1103 return 0;
1104 }
1105
qca_wcn3990_init(struct hci_uart * hu)1106 static int qca_wcn3990_init(struct hci_uart *hu)
1107 {
1108 struct hci_dev *hdev = hu->hdev;
1109 int ret;
1110
1111 /* Forcefully enable wcn3990 to enter in to boot mode. */
1112 host_set_baudrate(hu, 2400);
1113 ret = qca_send_power_pulse(hdev, QCA_WCN3990_POWEROFF_PULSE);
1114 if (ret)
1115 return ret;
1116
1117 qca_set_speed(hu, QCA_INIT_SPEED);
1118 ret = qca_send_power_pulse(hdev, QCA_WCN3990_POWERON_PULSE);
1119 if (ret)
1120 return ret;
1121
1122 /* Wait for 100 ms for SoC to boot */
1123 msleep(100);
1124
1125 /* Now the device is in ready state to communicate with host.
1126 * To sync host with device we need to reopen port.
1127 * Without this, we will have RTS and CTS synchronization
1128 * issues.
1129 */
1130 serdev_device_close(hu->serdev);
1131 ret = serdev_device_open(hu->serdev);
1132 if (ret) {
1133 bt_dev_err(hu->hdev, "failed to open port");
1134 return ret;
1135 }
1136
1137 hci_uart_set_flow_control(hu, false);
1138
1139 return 0;
1140 }
1141
qca_setup(struct hci_uart * hu)1142 static int qca_setup(struct hci_uart *hu)
1143 {
1144 struct hci_dev *hdev = hu->hdev;
1145 struct qca_data *qca = hu->priv;
1146 unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1147 struct qca_serdev *qcadev;
1148 int ret;
1149 int soc_ver = 0;
1150
1151 qcadev = serdev_device_get_drvdata(hu->serdev);
1152
1153 ret = qca_check_speeds(hu);
1154 if (ret)
1155 return ret;
1156
1157 /* Patch downloading has to be done without IBS mode */
1158 clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1159
1160 if (qcadev->btsoc_type == QCA_WCN3990) {
1161 bt_dev_info(hdev, "setting up wcn3990");
1162 ret = qca_wcn3990_init(hu);
1163 if (ret)
1164 return ret;
1165
1166 ret = qca_read_soc_version(hdev, &soc_ver);
1167 if (ret)
1168 return ret;
1169 } else {
1170 bt_dev_info(hdev, "ROME setup");
1171 qca_set_speed(hu, QCA_INIT_SPEED);
1172 }
1173
1174 /* Setup user speed if needed */
1175 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1176 if (speed) {
1177 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1178 if (ret)
1179 return ret;
1180
1181 qca_baudrate = qca_get_baudrate_value(speed);
1182 }
1183
1184 if (qcadev->btsoc_type != QCA_WCN3990) {
1185 /* Get QCA version information */
1186 ret = qca_read_soc_version(hdev, &soc_ver);
1187 if (ret)
1188 return ret;
1189 }
1190
1191 bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
1192 /* Setup patch / NVM configurations */
1193 ret = qca_uart_setup(hdev, qca_baudrate, qcadev->btsoc_type, soc_ver);
1194 if (!ret) {
1195 set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1196 qca_debugfs_init(hdev);
1197 } else if (ret == -ENOENT) {
1198 /* No patch/nvm-config found, run with original fw/config */
1199 ret = 0;
1200 } else if (ret == -EAGAIN) {
1201 /*
1202 * Userspace firmware loader will return -EAGAIN in case no
1203 * patch/nvm-config is found, so run with original fw/config.
1204 */
1205 ret = 0;
1206 }
1207
1208 /* Setup bdaddr */
1209 hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1210
1211 return ret;
1212 }
1213
1214 static struct hci_uart_proto qca_proto = {
1215 .id = HCI_UART_QCA,
1216 .name = "QCA",
1217 .manufacturer = 29,
1218 .init_speed = 115200,
1219 .oper_speed = 3000000,
1220 .open = qca_open,
1221 .close = qca_close,
1222 .flush = qca_flush,
1223 .setup = qca_setup,
1224 .recv = qca_recv,
1225 .enqueue = qca_enqueue,
1226 .dequeue = qca_dequeue,
1227 };
1228
1229 static const struct qca_vreg_data qca_soc_data = {
1230 .soc_type = QCA_WCN3990,
1231 .vregs = (struct qca_vreg []) {
1232 { "vddio", 1800000, 1900000, 15000 },
1233 { "vddxo", 1800000, 1900000, 80000 },
1234 { "vddrf", 1300000, 1350000, 300000 },
1235 { "vddch0", 3300000, 3400000, 450000 },
1236 },
1237 .num_vregs = 4,
1238 };
1239
qca_power_shutdown(struct hci_uart * hu)1240 static void qca_power_shutdown(struct hci_uart *hu)
1241 {
1242 struct serdev_device *serdev = hu->serdev;
1243 unsigned char cmd = QCA_WCN3990_POWEROFF_PULSE;
1244
1245 host_set_baudrate(hu, 2400);
1246 hci_uart_set_flow_control(hu, true);
1247 serdev_device_write_buf(serdev, &cmd, sizeof(cmd));
1248 hci_uart_set_flow_control(hu, false);
1249 qca_power_setup(hu, false);
1250 }
1251
qca_enable_regulator(struct qca_vreg vregs,struct regulator * regulator)1252 static int qca_enable_regulator(struct qca_vreg vregs,
1253 struct regulator *regulator)
1254 {
1255 int ret;
1256
1257 ret = regulator_set_voltage(regulator, vregs.min_uV,
1258 vregs.max_uV);
1259 if (ret)
1260 return ret;
1261
1262 if (vregs.load_uA)
1263 ret = regulator_set_load(regulator,
1264 vregs.load_uA);
1265
1266 if (ret)
1267 return ret;
1268
1269 return regulator_enable(regulator);
1270
1271 }
1272
qca_disable_regulator(struct qca_vreg vregs,struct regulator * regulator)1273 static void qca_disable_regulator(struct qca_vreg vregs,
1274 struct regulator *regulator)
1275 {
1276 regulator_disable(regulator);
1277 regulator_set_voltage(regulator, 0, vregs.max_uV);
1278 if (vregs.load_uA)
1279 regulator_set_load(regulator, 0);
1280
1281 }
1282
qca_power_setup(struct hci_uart * hu,bool on)1283 static int qca_power_setup(struct hci_uart *hu, bool on)
1284 {
1285 struct qca_vreg *vregs;
1286 struct regulator_bulk_data *vreg_bulk;
1287 struct qca_serdev *qcadev;
1288 int i, num_vregs, ret = 0;
1289
1290 qcadev = serdev_device_get_drvdata(hu->serdev);
1291 if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data ||
1292 !qcadev->bt_power->vreg_bulk)
1293 return -EINVAL;
1294
1295 vregs = qcadev->bt_power->vreg_data->vregs;
1296 vreg_bulk = qcadev->bt_power->vreg_bulk;
1297 num_vregs = qcadev->bt_power->vreg_data->num_vregs;
1298 BT_DBG("on: %d", on);
1299 if (on && !qcadev->bt_power->vregs_on) {
1300 for (i = 0; i < num_vregs; i++) {
1301 ret = qca_enable_regulator(vregs[i],
1302 vreg_bulk[i].consumer);
1303 if (ret)
1304 break;
1305 }
1306
1307 if (ret) {
1308 BT_ERR("failed to enable regulator:%s", vregs[i].name);
1309 /* turn off regulators which are enabled */
1310 for (i = i - 1; i >= 0; i--)
1311 qca_disable_regulator(vregs[i],
1312 vreg_bulk[i].consumer);
1313 } else {
1314 qcadev->bt_power->vregs_on = true;
1315 }
1316 } else if (!on && qcadev->bt_power->vregs_on) {
1317 /* turn off regulator in reverse order */
1318 i = qcadev->bt_power->vreg_data->num_vregs - 1;
1319 for ( ; i >= 0; i--)
1320 qca_disable_regulator(vregs[i], vreg_bulk[i].consumer);
1321
1322 qcadev->bt_power->vregs_on = false;
1323 }
1324
1325 return ret;
1326 }
1327
qca_init_regulators(struct qca_power * qca,const struct qca_vreg * vregs,size_t num_vregs)1328 static int qca_init_regulators(struct qca_power *qca,
1329 const struct qca_vreg *vregs, size_t num_vregs)
1330 {
1331 int i;
1332
1333 qca->vreg_bulk = devm_kcalloc(qca->dev, num_vregs,
1334 sizeof(struct regulator_bulk_data),
1335 GFP_KERNEL);
1336 if (!qca->vreg_bulk)
1337 return -ENOMEM;
1338
1339 for (i = 0; i < num_vregs; i++)
1340 qca->vreg_bulk[i].supply = vregs[i].name;
1341
1342 return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk);
1343 }
1344
qca_serdev_probe(struct serdev_device * serdev)1345 static int qca_serdev_probe(struct serdev_device *serdev)
1346 {
1347 struct qca_serdev *qcadev;
1348 const struct qca_vreg_data *data;
1349 int err;
1350
1351 qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1352 if (!qcadev)
1353 return -ENOMEM;
1354
1355 qcadev->serdev_hu.serdev = serdev;
1356 data = of_device_get_match_data(&serdev->dev);
1357 serdev_device_set_drvdata(serdev, qcadev);
1358 if (data && data->soc_type == QCA_WCN3990) {
1359 qcadev->btsoc_type = QCA_WCN3990;
1360 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1361 sizeof(struct qca_power),
1362 GFP_KERNEL);
1363 if (!qcadev->bt_power)
1364 return -ENOMEM;
1365
1366 qcadev->bt_power->dev = &serdev->dev;
1367 qcadev->bt_power->vreg_data = data;
1368 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1369 data->num_vregs);
1370 if (err) {
1371 BT_ERR("Failed to init regulators:%d", err);
1372 goto out;
1373 }
1374
1375 qcadev->bt_power->vregs_on = false;
1376
1377 device_property_read_u32(&serdev->dev, "max-speed",
1378 &qcadev->oper_speed);
1379 if (!qcadev->oper_speed)
1380 BT_DBG("UART will pick default operating speed");
1381
1382 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1383 if (err) {
1384 BT_ERR("wcn3990 serdev registration failed");
1385 goto out;
1386 }
1387 } else {
1388 qcadev->btsoc_type = QCA_ROME;
1389 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
1390 GPIOD_OUT_LOW);
1391 if (IS_ERR(qcadev->bt_en)) {
1392 dev_err(&serdev->dev, "failed to acquire enable gpio\n");
1393 return PTR_ERR(qcadev->bt_en);
1394 }
1395
1396 qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
1397 if (IS_ERR(qcadev->susclk)) {
1398 dev_err(&serdev->dev, "failed to acquire clk\n");
1399 return PTR_ERR(qcadev->susclk);
1400 }
1401
1402 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
1403 if (err)
1404 return err;
1405
1406 err = clk_prepare_enable(qcadev->susclk);
1407 if (err)
1408 return err;
1409
1410 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1411 if (err)
1412 clk_disable_unprepare(qcadev->susclk);
1413 }
1414
1415 out: return err;
1416
1417 }
1418
qca_serdev_remove(struct serdev_device * serdev)1419 static void qca_serdev_remove(struct serdev_device *serdev)
1420 {
1421 struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
1422
1423 if (qcadev->btsoc_type == QCA_WCN3990)
1424 qca_power_shutdown(&qcadev->serdev_hu);
1425 else
1426 clk_disable_unprepare(qcadev->susclk);
1427
1428 hci_uart_unregister_device(&qcadev->serdev_hu);
1429 }
1430
1431 static const struct of_device_id qca_bluetooth_of_match[] = {
1432 { .compatible = "qcom,qca6174-bt" },
1433 { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data},
1434 { /* sentinel */ }
1435 };
1436 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
1437
1438 static struct serdev_device_driver qca_serdev_driver = {
1439 .probe = qca_serdev_probe,
1440 .remove = qca_serdev_remove,
1441 .driver = {
1442 .name = "hci_uart_qca",
1443 .of_match_table = qca_bluetooth_of_match,
1444 },
1445 };
1446
qca_init(void)1447 int __init qca_init(void)
1448 {
1449 serdev_device_driver_register(&qca_serdev_driver);
1450
1451 return hci_uart_register_proto(&qca_proto);
1452 }
1453
qca_deinit(void)1454 int __exit qca_deinit(void)
1455 {
1456 serdev_device_driver_unregister(&qca_serdev_driver);
1457
1458 return hci_uart_unregister_proto(&qca_proto);
1459 }
1460