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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Bluetooth HCI UART driver for Broadcom devices
5 *
6 * Copyright (C) 2015 Intel Corporation
7 */
8
9#include <linux/kernel.h>
10#include <linux/errno.h>
11#include <linux/skbuff.h>
12#include <linux/firmware.h>
13#include <linux/module.h>
14#include <linux/acpi.h>
15#include <linux/of.h>
16#include <linux/of_irq.h>
17#include <linux/property.h>
18#include <linux/platform_data/x86/apple.h>
19#include <linux/platform_device.h>
20#include <linux/regulator/consumer.h>
21#include <linux/clk.h>
22#include <linux/gpio/consumer.h>
23#include <linux/gpio/machine.h>
24#include <linux/tty.h>
25#include <linux/interrupt.h>
26#include <linux/dmi.h>
27#include <linux/pm_runtime.h>
28#include <linux/serdev.h>
29
30#include <net/bluetooth/bluetooth.h>
31#include <net/bluetooth/hci_core.h>
32
33#include "btbcm.h"
34#include "hci_uart.h"
35
36#define BCM_NULL_PKT 0x00
37#define BCM_NULL_SIZE 0
38
39#define BCM_LM_DIAG_PKT 0x07
40#define BCM_LM_DIAG_SIZE 63
41
42#define BCM_TYPE49_PKT 0x31
43#define BCM_TYPE49_SIZE 0
44
45#define BCM_TYPE52_PKT 0x34
46#define BCM_TYPE52_SIZE 0
47
48#define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
49
50#define BCM_NUM_SUPPLIES 2
51
52/**
53 * struct bcm_device_data - device specific data
54 * @no_early_set_baudrate: Disallow set baudrate before driver setup()
55 * @drive_rts_on_open: drive RTS signal on ->open() when platform requires it
56 * @no_uart_clock_set: UART clock set command for >3Mbps mode is unavailable
57 * @max_autobaud_speed: max baudrate supported by device in autobaud mode
58 * @max_speed: max baudrate supported
59 */
60struct bcm_device_data {
61 bool no_early_set_baudrate;
62 bool drive_rts_on_open;
63 bool no_uart_clock_set;
64 u32 max_autobaud_speed;
65 u32 max_speed;
66};
67
68/**
69 * struct bcm_device - device driver resources
70 * @serdev_hu: HCI UART controller struct
71 * @list: bcm_device_list node
72 * @dev: physical UART slave
73 * @name: device name logged by bt_dev_*() functions
74 * @device_wakeup: BT_WAKE pin,
75 * assert = Bluetooth device must wake up or remain awake,
76 * deassert = Bluetooth device may sleep when sleep criteria are met
77 * @shutdown: BT_REG_ON pin,
78 * power up or power down Bluetooth device internal regulators
79 * @reset: BT_RST_N pin,
80 * active low resets the Bluetooth logic core
81 * @set_device_wakeup: callback to toggle BT_WAKE pin
82 * either by accessing @device_wakeup or by calling @btlp
83 * @set_shutdown: callback to toggle BT_REG_ON pin
84 * either by accessing @shutdown or by calling @btpu/@btpd
85 * @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power")
86 * @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up")
87 * @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down")
88 * @gpio_count: internal counter for GPIO resources associated with ACPI device
89 * @gpio_int_idx: index in _CRS for GpioInt() resource
90 * @txco_clk: external reference frequency clock used by Bluetooth device
91 * @lpo_clk: external LPO clock used by Bluetooth device
92 * @supplies: VBAT and VDDIO supplies used by Bluetooth device
93 * @res_enabled: whether clocks and supplies are prepared and enabled
94 * @init_speed: default baudrate of Bluetooth device;
95 * the host UART is initially set to this baudrate so that
96 * it can configure the Bluetooth device for @oper_speed
97 * @oper_speed: preferred baudrate of Bluetooth device;
98 * set to 0 if @init_speed is already the preferred baudrate
99 * @irq: interrupt triggered by HOST_WAKE_BT pin
100 * @irq_active_low: whether @irq is active low
101 * @irq_acquired: flag to show if IRQ handler has been assigned
102 * @hu: pointer to HCI UART controller struct,
103 * used to disable flow control during runtime suspend and system sleep
104 * @is_suspended: whether flow control is currently disabled
105 * @no_early_set_baudrate: don't set_baudrate before setup()
106 * @drive_rts_on_open: drive RTS signal on ->open() when platform requires it
107 * @no_uart_clock_set: UART clock set command for >3Mbps mode is unavailable
108 * @pcm_int_params: keep the initial PCM configuration
109 * @use_autobaud_mode: start Bluetooth device in autobaud mode
110 * @max_autobaud_speed: max baudrate supported by device in autobaud mode
111 */
112struct bcm_device {
113 /* Must be the first member, hci_serdev.c expects this. */
114 struct hci_uart serdev_hu;
115 struct list_head list;
116
117 struct device *dev;
118
119 const char *name;
120 struct gpio_desc *device_wakeup;
121 struct gpio_desc *shutdown;
122 struct gpio_desc *reset;
123 int (*set_device_wakeup)(struct bcm_device *, bool);
124 int (*set_shutdown)(struct bcm_device *, bool);
125#ifdef CONFIG_ACPI
126 acpi_handle btlp, btpu, btpd;
127 int gpio_count;
128 int gpio_int_idx;
129#endif
130
131 struct clk *txco_clk;
132 struct clk *lpo_clk;
133 struct regulator_bulk_data supplies[BCM_NUM_SUPPLIES];
134 bool res_enabled;
135
136 u32 init_speed;
137 u32 oper_speed;
138 int irq;
139 bool irq_active_low;
140 bool irq_acquired;
141
142#ifdef CONFIG_PM
143 struct hci_uart *hu;
144 bool is_suspended;
145#endif
146 bool no_early_set_baudrate;
147 bool drive_rts_on_open;
148 bool no_uart_clock_set;
149 bool use_autobaud_mode;
150 u8 pcm_int_params[5];
151 u32 max_autobaud_speed;
152};
153
154/* generic bcm uart resources */
155struct bcm_data {
156 struct sk_buff *rx_skb;
157 struct sk_buff_head txq;
158
159 struct bcm_device *dev;
160};
161
162/* List of BCM BT UART devices */
163static DEFINE_MUTEX(bcm_device_lock);
164static LIST_HEAD(bcm_device_list);
165
166static int irq_polarity = -1;
167module_param(irq_polarity, int, 0444);
168MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low");
169
170static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
171{
172 if (hu->serdev)
173 serdev_device_set_baudrate(hu->serdev, speed);
174 else
175 hci_uart_set_baudrate(hu, speed);
176}
177
178static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
179{
180 struct hci_dev *hdev = hu->hdev;
181 struct bcm_data *bcm = hu->priv;
182 struct sk_buff *skb;
183 struct bcm_update_uart_baud_rate param;
184
185 if (speed > 3000000 && !bcm->dev->no_uart_clock_set) {
186 struct bcm_write_uart_clock_setting clock;
187
188 clock.type = BCM_UART_CLOCK_48MHZ;
189
190 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
191
192 /* This Broadcom specific command changes the UART's controller
193 * clock for baud rate > 3000000.
194 */
195 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
196 if (IS_ERR(skb)) {
197 int err = PTR_ERR(skb);
198 bt_dev_err(hdev, "BCM: failed to write clock (%d)",
199 err);
200 return err;
201 }
202
203 kfree_skb(skb);
204 }
205
206 bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
207
208 param.zero = cpu_to_le16(0);
209 param.baud_rate = cpu_to_le32(speed);
210
211 /* This Broadcom specific command changes the UART's controller baud
212 * rate.
213 */
214 skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), ¶m,
215 HCI_INIT_TIMEOUT);
216 if (IS_ERR(skb)) {
217 int err = PTR_ERR(skb);
218 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
219 err);
220 return err;
221 }
222
223 kfree_skb(skb);
224
225 return 0;
226}
227
228/* bcm_device_exists should be protected by bcm_device_lock */
229static bool bcm_device_exists(struct bcm_device *device)
230{
231 struct list_head *p;
232
233#ifdef CONFIG_PM
234 /* Devices using serdev always exist */
235 if (device && device->hu && device->hu->serdev)
236 return true;
237#endif
238
239 list_for_each(p, &bcm_device_list) {
240 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
241
242 if (device == dev)
243 return true;
244 }
245
246 return false;
247}
248
249static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
250{
251 int err;
252
253 if (powered && !dev->res_enabled) {
254 /* Intel Macs use bcm_apple_get_resources() and don't
255 * have regulator supplies configured.
256 */
257 if (dev->supplies[0].supply) {
258 err = regulator_bulk_enable(BCM_NUM_SUPPLIES,
259 dev->supplies);
260 if (err)
261 return err;
262 }
263
264 /* LPO clock needs to be 32.768 kHz */
265 err = clk_set_rate(dev->lpo_clk, 32768);
266 if (err) {
267 dev_err(dev->dev, "Could not set LPO clock rate\n");
268 goto err_regulator_disable;
269 }
270
271 err = clk_prepare_enable(dev->lpo_clk);
272 if (err)
273 goto err_regulator_disable;
274
275 err = clk_prepare_enable(dev->txco_clk);
276 if (err)
277 goto err_lpo_clk_disable;
278 }
279
280 err = dev->set_shutdown(dev, powered);
281 if (err)
282 goto err_txco_clk_disable;
283
284 err = dev->set_device_wakeup(dev, powered);
285 if (err)
286 goto err_revert_shutdown;
287
288 if (!powered && dev->res_enabled) {
289 clk_disable_unprepare(dev->txco_clk);
290 clk_disable_unprepare(dev->lpo_clk);
291
292 /* Intel Macs use bcm_apple_get_resources() and don't
293 * have regulator supplies configured.
294 */
295 if (dev->supplies[0].supply)
296 regulator_bulk_disable(BCM_NUM_SUPPLIES,
297 dev->supplies);
298 }
299
300 /* wait for device to power on and come out of reset */
301 usleep_range(100000, 120000);
302
303 dev->res_enabled = powered;
304
305 return 0;
306
307err_revert_shutdown:
308 dev->set_shutdown(dev, !powered);
309err_txco_clk_disable:
310 if (powered && !dev->res_enabled)
311 clk_disable_unprepare(dev->txco_clk);
312err_lpo_clk_disable:
313 if (powered && !dev->res_enabled)
314 clk_disable_unprepare(dev->lpo_clk);
315err_regulator_disable:
316 if (powered && !dev->res_enabled)
317 regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies);
318 return err;
319}
320
321#ifdef CONFIG_PM
322static irqreturn_t bcm_host_wake(int irq, void *data)
323{
324 struct bcm_device *bdev = data;
325
326 bt_dev_dbg(bdev, "Host wake IRQ");
327
328 pm_runtime_get(bdev->dev);
329 pm_runtime_mark_last_busy(bdev->dev);
330 pm_runtime_put_autosuspend(bdev->dev);
331
332 return IRQ_HANDLED;
333}
334
335static int bcm_request_irq(struct bcm_data *bcm)
336{
337 struct bcm_device *bdev = bcm->dev;
338 int err;
339
340 mutex_lock(&bcm_device_lock);
341 if (!bcm_device_exists(bdev)) {
342 err = -ENODEV;
343 goto unlock;
344 }
345
346 if (bdev->irq <= 0) {
347 err = -EOPNOTSUPP;
348 goto unlock;
349 }
350
351 err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake,
352 bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
353 IRQF_TRIGGER_RISING,
354 "host_wake", bdev);
355 if (err) {
356 bdev->irq = err;
357 goto unlock;
358 }
359
360 bdev->irq_acquired = true;
361
362 device_init_wakeup(bdev->dev, true);
363
364 pm_runtime_set_autosuspend_delay(bdev->dev,
365 BCM_AUTOSUSPEND_DELAY);
366 pm_runtime_use_autosuspend(bdev->dev);
367 pm_runtime_set_active(bdev->dev);
368 pm_runtime_enable(bdev->dev);
369
370unlock:
371 mutex_unlock(&bcm_device_lock);
372
373 return err;
374}
375
376static const struct bcm_set_sleep_mode default_sleep_params = {
377 .sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
378 .idle_host = 2, /* idle threshold HOST, in 300ms */
379 .idle_dev = 2, /* idle threshold device, in 300ms */
380 .bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */
381 .host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */
382 .allow_host_sleep = 1, /* Allow host sleep in SCO flag */
383 .combine_modes = 1, /* Combine sleep and LPM flag */
384 .tristate_control = 0, /* Allow tri-state control of UART tx flag */
385 /* Irrelevant USB flags */
386 .usb_auto_sleep = 0,
387 .usb_resume_timeout = 0,
388 .break_to_host = 0,
389 .pulsed_host_wake = 1,
390};
391
392static int bcm_setup_sleep(struct hci_uart *hu)
393{
394 struct bcm_data *bcm = hu->priv;
395 struct sk_buff *skb;
396 struct bcm_set_sleep_mode sleep_params = default_sleep_params;
397
398 sleep_params.host_wake_active = !bcm->dev->irq_active_low;
399
400 skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
401 &sleep_params, HCI_INIT_TIMEOUT);
402 if (IS_ERR(skb)) {
403 int err = PTR_ERR(skb);
404 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
405 return err;
406 }
407 kfree_skb(skb);
408
409 bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
410
411 return 0;
412}
413#else
414static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
415static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
416#endif
417
418static int bcm_set_diag(struct hci_dev *hdev, bool enable)
419{
420 struct hci_uart *hu = hci_get_drvdata(hdev);
421 struct bcm_data *bcm = hu->priv;
422 struct sk_buff *skb;
423
424 if (!test_bit(HCI_RUNNING, &hdev->flags))
425 return -ENETDOWN;
426
427 skb = bt_skb_alloc(3, GFP_KERNEL);
428 if (!skb)
429 return -ENOMEM;
430
431 skb_put_u8(skb, BCM_LM_DIAG_PKT);
432 skb_put_u8(skb, 0xf0);
433 skb_put_u8(skb, enable);
434
435 skb_queue_tail(&bcm->txq, skb);
436 hci_uart_tx_wakeup(hu);
437
438 return 0;
439}
440
441static int bcm_open(struct hci_uart *hu)
442{
443 struct bcm_data *bcm;
444 struct list_head *p;
445 int err;
446
447 bt_dev_dbg(hu->hdev, "hu %p", hu);
448
449 if (!hci_uart_has_flow_control(hu))
450 return -EOPNOTSUPP;
451
452 bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
453 if (!bcm)
454 return -ENOMEM;
455
456 skb_queue_head_init(&bcm->txq);
457
458 hu->priv = bcm;
459
460 mutex_lock(&bcm_device_lock);
461
462 if (hu->serdev) {
463 bcm->dev = serdev_device_get_drvdata(hu->serdev);
464 goto out;
465 }
466
467 if (!hu->tty->dev)
468 goto out;
469
470 list_for_each(p, &bcm_device_list) {
471 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
472
473 /* Retrieve saved bcm_device based on parent of the
474 * platform device (saved during device probe) and
475 * parent of tty device used by hci_uart
476 */
477 if (hu->tty->dev->parent == dev->dev->parent) {
478 bcm->dev = dev;
479#ifdef CONFIG_PM
480 dev->hu = hu;
481#endif
482 break;
483 }
484 }
485
486out:
487 if (bcm->dev) {
488 if (bcm->dev->use_autobaud_mode)
489 hci_uart_set_flow_control(hu, false); /* Assert BT_UART_CTS_N */
490 else if (bcm->dev->drive_rts_on_open)
491 hci_uart_set_flow_control(hu, true);
492
493 if (bcm->dev->use_autobaud_mode && bcm->dev->max_autobaud_speed)
494 hu->init_speed = min(bcm->dev->oper_speed, bcm->dev->max_autobaud_speed);
495 else
496 hu->init_speed = bcm->dev->init_speed;
497
498 /* If oper_speed is set, ldisc/serdev will set the baudrate
499 * before calling setup()
500 */
501 if (!bcm->dev->no_early_set_baudrate && !bcm->dev->use_autobaud_mode)
502 hu->oper_speed = bcm->dev->oper_speed;
503
504 err = bcm_gpio_set_power(bcm->dev, true);
505
506 if (bcm->dev->drive_rts_on_open)
507 hci_uart_set_flow_control(hu, false);
508
509 if (err)
510 goto err_unset_hu;
511 }
512
513 mutex_unlock(&bcm_device_lock);
514 return 0;
515
516err_unset_hu:
517#ifdef CONFIG_PM
518 if (!hu->serdev)
519 bcm->dev->hu = NULL;
520#endif
521 mutex_unlock(&bcm_device_lock);
522 hu->priv = NULL;
523 kfree(bcm);
524 return err;
525}
526
527static int bcm_close(struct hci_uart *hu)
528{
529 struct bcm_data *bcm = hu->priv;
530 struct bcm_device *bdev = NULL;
531 int err;
532
533 bt_dev_dbg(hu->hdev, "hu %p", hu);
534
535 /* Protect bcm->dev against removal of the device or driver */
536 mutex_lock(&bcm_device_lock);
537
538 if (hu->serdev) {
539 bdev = serdev_device_get_drvdata(hu->serdev);
540 } else if (bcm_device_exists(bcm->dev)) {
541 bdev = bcm->dev;
542#ifdef CONFIG_PM
543 bdev->hu = NULL;
544#endif
545 }
546
547 if (bdev) {
548 if (IS_ENABLED(CONFIG_PM) && bdev->irq_acquired) {
549 devm_free_irq(bdev->dev, bdev->irq, bdev);
550 device_init_wakeup(bdev->dev, false);
551 pm_runtime_disable(bdev->dev);
552 }
553
554 err = bcm_gpio_set_power(bdev, false);
555 if (err)
556 bt_dev_err(hu->hdev, "Failed to power down");
557 else
558 pm_runtime_set_suspended(bdev->dev);
559 }
560 mutex_unlock(&bcm_device_lock);
561
562 skb_queue_purge(&bcm->txq);
563 kfree_skb(bcm->rx_skb);
564 kfree(bcm);
565
566 hu->priv = NULL;
567 return 0;
568}
569
570static int bcm_flush(struct hci_uart *hu)
571{
572 struct bcm_data *bcm = hu->priv;
573
574 bt_dev_dbg(hu->hdev, "hu %p", hu);
575
576 skb_queue_purge(&bcm->txq);
577
578 return 0;
579}
580
581static int bcm_setup(struct hci_uart *hu)
582{
583 struct bcm_data *bcm = hu->priv;
584 bool fw_load_done = false;
585 bool use_autobaud_mode = (bcm->dev ? bcm->dev->use_autobaud_mode : 0);
586 unsigned int speed;
587 int err;
588
589 bt_dev_dbg(hu->hdev, "hu %p", hu);
590
591 hu->hdev->set_diag = bcm_set_diag;
592 hu->hdev->set_bdaddr = btbcm_set_bdaddr;
593
594 err = btbcm_initialize(hu->hdev, &fw_load_done, use_autobaud_mode);
595 if (err)
596 return err;
597
598 if (!fw_load_done)
599 return 0;
600
601 /* Init speed if any */
602 if (bcm->dev && bcm->dev->init_speed)
603 speed = bcm->dev->init_speed;
604 else if (hu->proto->init_speed)
605 speed = hu->proto->init_speed;
606 else
607 speed = 0;
608
609 if (speed)
610 host_set_baudrate(hu, speed);
611
612 /* Operational speed if any */
613 if (hu->oper_speed)
614 speed = hu->oper_speed;
615 else if (bcm->dev && bcm->dev->oper_speed)
616 speed = bcm->dev->oper_speed;
617 else if (hu->proto->oper_speed)
618 speed = hu->proto->oper_speed;
619 else
620 speed = 0;
621
622 if (speed) {
623 err = bcm_set_baudrate(hu, speed);
624 if (!err)
625 host_set_baudrate(hu, speed);
626 }
627
628 /* PCM parameters if provided */
629 if (bcm->dev && bcm->dev->pcm_int_params[0] != 0xff) {
630 struct bcm_set_pcm_int_params params;
631
632 btbcm_read_pcm_int_params(hu->hdev, ¶ms);
633
634 memcpy(¶ms, bcm->dev->pcm_int_params, 5);
635 btbcm_write_pcm_int_params(hu->hdev, ¶ms);
636 }
637
638 err = btbcm_finalize(hu->hdev, &fw_load_done, use_autobaud_mode);
639 if (err)
640 return err;
641
642 /* Some devices ship with the controller default address.
643 * Allow the bootloader to set a valid address through the
644 * device tree.
645 */
646 if (test_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks))
647 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hu->hdev->quirks);
648
649 if (!bcm_request_irq(bcm))
650 err = bcm_setup_sleep(hu);
651
652 return err;
653}
654
655#define BCM_RECV_LM_DIAG \
656 .type = BCM_LM_DIAG_PKT, \
657 .hlen = BCM_LM_DIAG_SIZE, \
658 .loff = 0, \
659 .lsize = 0, \
660 .maxlen = BCM_LM_DIAG_SIZE
661
662#define BCM_RECV_NULL \
663 .type = BCM_NULL_PKT, \
664 .hlen = BCM_NULL_SIZE, \
665 .loff = 0, \
666 .lsize = 0, \
667 .maxlen = BCM_NULL_SIZE
668
669#define BCM_RECV_TYPE49 \
670 .type = BCM_TYPE49_PKT, \
671 .hlen = BCM_TYPE49_SIZE, \
672 .loff = 0, \
673 .lsize = 0, \
674 .maxlen = BCM_TYPE49_SIZE
675
676#define BCM_RECV_TYPE52 \
677 .type = BCM_TYPE52_PKT, \
678 .hlen = BCM_TYPE52_SIZE, \
679 .loff = 0, \
680 .lsize = 0, \
681 .maxlen = BCM_TYPE52_SIZE
682
683static const struct h4_recv_pkt bcm_recv_pkts[] = {
684 { H4_RECV_ACL, .recv = hci_recv_frame },
685 { H4_RECV_SCO, .recv = hci_recv_frame },
686 { H4_RECV_EVENT, .recv = hci_recv_frame },
687 { H4_RECV_ISO, .recv = hci_recv_frame },
688 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag },
689 { BCM_RECV_NULL, .recv = hci_recv_diag },
690 { BCM_RECV_TYPE49, .recv = hci_recv_diag },
691 { BCM_RECV_TYPE52, .recv = hci_recv_diag },
692};
693
694static int bcm_recv(struct hci_uart *hu, const void *data, int count)
695{
696 struct bcm_data *bcm = hu->priv;
697
698 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
699 return -EUNATCH;
700
701 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
702 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
703 if (IS_ERR(bcm->rx_skb)) {
704 int err = PTR_ERR(bcm->rx_skb);
705 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
706 bcm->rx_skb = NULL;
707 return err;
708 } else if (!bcm->rx_skb) {
709 /* Delay auto-suspend when receiving completed packet */
710 mutex_lock(&bcm_device_lock);
711 if (bcm->dev && bcm_device_exists(bcm->dev)) {
712 pm_runtime_get(bcm->dev->dev);
713 pm_runtime_mark_last_busy(bcm->dev->dev);
714 pm_runtime_put_autosuspend(bcm->dev->dev);
715 }
716 mutex_unlock(&bcm_device_lock);
717 }
718
719 return count;
720}
721
722static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
723{
724 struct bcm_data *bcm = hu->priv;
725
726 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
727
728 /* Prepend skb with frame type */
729 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
730 skb_queue_tail(&bcm->txq, skb);
731
732 return 0;
733}
734
735static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
736{
737 struct bcm_data *bcm = hu->priv;
738 struct sk_buff *skb = NULL;
739 struct bcm_device *bdev = NULL;
740
741 mutex_lock(&bcm_device_lock);
742
743 if (bcm_device_exists(bcm->dev)) {
744 bdev = bcm->dev;
745 pm_runtime_get_sync(bdev->dev);
746 /* Shall be resumed here */
747 }
748
749 skb = skb_dequeue(&bcm->txq);
750
751 if (bdev) {
752 pm_runtime_mark_last_busy(bdev->dev);
753 pm_runtime_put_autosuspend(bdev->dev);
754 }
755
756 mutex_unlock(&bcm_device_lock);
757
758 return skb;
759}
760
761#ifdef CONFIG_PM
762static int bcm_suspend_device(struct device *dev)
763{
764 struct bcm_device *bdev = dev_get_drvdata(dev);
765 int err;
766
767 bt_dev_dbg(bdev, "");
768
769 if (!bdev->is_suspended && bdev->hu) {
770 hci_uart_set_flow_control(bdev->hu, true);
771
772 /* Once this returns, driver suspends BT via GPIO */
773 bdev->is_suspended = true;
774 }
775
776 /* Suspend the device */
777 err = bdev->set_device_wakeup(bdev, false);
778 if (err) {
779 if (bdev->is_suspended && bdev->hu) {
780 bdev->is_suspended = false;
781 hci_uart_set_flow_control(bdev->hu, false);
782 }
783 return -EBUSY;
784 }
785
786 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
787 msleep(15);
788
789 return 0;
790}
791
792static int bcm_resume_device(struct device *dev)
793{
794 struct bcm_device *bdev = dev_get_drvdata(dev);
795 int err;
796
797 bt_dev_dbg(bdev, "");
798
799 err = bdev->set_device_wakeup(bdev, true);
800 if (err) {
801 dev_err(dev, "Failed to power up\n");
802 return err;
803 }
804
805 bt_dev_dbg(bdev, "resume, delaying 15 ms");
806 msleep(15);
807
808 /* When this executes, the device has woken up already */
809 if (bdev->is_suspended && bdev->hu) {
810 bdev->is_suspended = false;
811
812 hci_uart_set_flow_control(bdev->hu, false);
813 }
814
815 return 0;
816}
817#endif
818
819#ifdef CONFIG_PM_SLEEP
820/* suspend callback */
821static int bcm_suspend(struct device *dev)
822{
823 struct bcm_device *bdev = dev_get_drvdata(dev);
824 int error;
825
826 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
827
828 /*
829 * When used with a device instantiated as platform_device, bcm_suspend
830 * can be called at any time as long as the platform device is bound,
831 * so it should use bcm_device_lock to protect access to hci_uart
832 * and device_wake-up GPIO.
833 */
834 mutex_lock(&bcm_device_lock);
835
836 if (!bdev->hu)
837 goto unlock;
838
839 if (pm_runtime_active(dev))
840 bcm_suspend_device(dev);
841
842 if (device_may_wakeup(dev) && bdev->irq > 0) {
843 error = enable_irq_wake(bdev->irq);
844 if (!error)
845 bt_dev_dbg(bdev, "BCM irq: enabled");
846 }
847
848unlock:
849 mutex_unlock(&bcm_device_lock);
850
851 return 0;
852}
853
854/* resume callback */
855static int bcm_resume(struct device *dev)
856{
857 struct bcm_device *bdev = dev_get_drvdata(dev);
858 int err = 0;
859
860 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
861
862 /*
863 * When used with a device instantiated as platform_device, bcm_resume
864 * can be called at any time as long as platform device is bound,
865 * so it should use bcm_device_lock to protect access to hci_uart
866 * and device_wake-up GPIO.
867 */
868 mutex_lock(&bcm_device_lock);
869
870 if (!bdev->hu)
871 goto unlock;
872
873 if (device_may_wakeup(dev) && bdev->irq > 0) {
874 disable_irq_wake(bdev->irq);
875 bt_dev_dbg(bdev, "BCM irq: disabled");
876 }
877
878 err = bcm_resume_device(dev);
879
880unlock:
881 mutex_unlock(&bcm_device_lock);
882
883 if (!err) {
884 pm_runtime_disable(dev);
885 pm_runtime_set_active(dev);
886 pm_runtime_enable(dev);
887 }
888
889 return 0;
890}
891#endif
892
893/* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
894static struct gpiod_lookup_table irq_on_int33fc02_pin17_gpios = {
895 .dev_id = "serial0-0",
896 .table = {
897 GPIO_LOOKUP("INT33FC:02", 17, "host-wakeup-alt", GPIO_ACTIVE_HIGH),
898 { }
899 },
900};
901
902static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
903 {
904 .ident = "Acer Iconia One 7 B1-750",
905 .matches = {
906 DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
907 DMI_MATCH(DMI_PRODUCT_NAME, "VESPA2"),
908 },
909 .driver_data = &irq_on_int33fc02_pin17_gpios,
910 },
911 {
912 .ident = "Asus TF103C",
913 .matches = {
914 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
915 DMI_MATCH(DMI_PRODUCT_NAME, "TF103C"),
916 },
917 .driver_data = &irq_on_int33fc02_pin17_gpios,
918 },
919 {
920 .ident = "Lenovo Yoga Tablet 2 830F/L / 1050F/L",
921 .matches = {
922 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corp."),
923 DMI_MATCH(DMI_PRODUCT_NAME, "VALLEYVIEW C0 PLATFORM"),
924 DMI_MATCH(DMI_BOARD_NAME, "BYT-T FFD8"),
925 /* Partial match on beginning of BIOS version */
926 DMI_MATCH(DMI_BIOS_VERSION, "BLADE_21"),
927 },
928 .driver_data = &irq_on_int33fc02_pin17_gpios,
929 },
930 {
931 .ident = "Meegopad T08",
932 .matches = {
933 DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
934 "To be filled by OEM."),
935 DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
936 DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
937 },
938 },
939 { }
940};
941
942#ifdef CONFIG_ACPI
943static const struct acpi_gpio_params first_gpio = { 0, 0, false };
944static const struct acpi_gpio_params second_gpio = { 1, 0, false };
945static const struct acpi_gpio_params third_gpio = { 2, 0, false };
946
947static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
948 { "device-wakeup-gpios", &first_gpio, 1 },
949 { "shutdown-gpios", &second_gpio, 1 },
950 { "host-wakeup-gpios", &third_gpio, 1 },
951 { },
952};
953
954static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
955 { "host-wakeup-gpios", &first_gpio, 1 },
956 { "device-wakeup-gpios", &second_gpio, 1 },
957 { "shutdown-gpios", &third_gpio, 1 },
958 { },
959};
960
961static int bcm_resource(struct acpi_resource *ares, void *data)
962{
963 struct bcm_device *dev = data;
964 struct acpi_resource_extended_irq *irq;
965 struct acpi_resource_gpio *gpio;
966 struct acpi_resource_uart_serialbus *sb;
967
968 switch (ares->type) {
969 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
970 irq = &ares->data.extended_irq;
971 if (irq->polarity != ACPI_ACTIVE_LOW)
972 dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
973 dev->irq_active_low = true;
974 break;
975
976 case ACPI_RESOURCE_TYPE_GPIO:
977 gpio = &ares->data.gpio;
978 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
979 dev->gpio_int_idx = dev->gpio_count;
980 dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
981 }
982 dev->gpio_count++;
983 break;
984
985 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
986 sb = &ares->data.uart_serial_bus;
987 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
988 dev->init_speed = sb->default_baud_rate;
989 dev->oper_speed = 4000000;
990 }
991 break;
992
993 default:
994 break;
995 }
996
997 return 0;
998}
999
1000static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
1001{
1002 if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
1003 return -EIO;
1004
1005 return 0;
1006}
1007
1008static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
1009{
1010 if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
1011 NULL, NULL, NULL)))
1012 return -EIO;
1013
1014 return 0;
1015}
1016
1017static int bcm_apple_get_resources(struct bcm_device *dev)
1018{
1019 struct acpi_device *adev = ACPI_COMPANION(dev->dev);
1020 const union acpi_object *obj;
1021
1022 if (!adev ||
1023 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
1024 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
1025 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
1026 return -ENODEV;
1027
1028 if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
1029 obj->buffer.length == 8)
1030 dev->init_speed = *(u64 *)obj->buffer.pointer;
1031
1032 dev->set_device_wakeup = bcm_apple_set_device_wakeup;
1033 dev->set_shutdown = bcm_apple_set_shutdown;
1034
1035 return 0;
1036}
1037#else
1038static inline int bcm_apple_get_resources(struct bcm_device *dev)
1039{
1040 return -EOPNOTSUPP;
1041}
1042#endif /* CONFIG_ACPI */
1043
1044static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
1045{
1046 gpiod_set_value_cansleep(dev->device_wakeup, awake);
1047 return 0;
1048}
1049
1050static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
1051{
1052 gpiod_set_value_cansleep(dev->shutdown, powered);
1053 if (dev->reset)
1054 /*
1055 * The reset line is asserted on powerdown and deasserted
1056 * on poweron so the inverse of powered is used. Notice
1057 * that the GPIO line BT_RST_N needs to be specified as
1058 * active low in the device tree or similar system
1059 * description.
1060 */
1061 gpiod_set_value_cansleep(dev->reset, !powered);
1062 return 0;
1063}
1064
1065/* Try a bunch of names for TXCO */
1066static struct clk *bcm_get_txco(struct device *dev)
1067{
1068 struct clk *clk;
1069
1070 /* New explicit name */
1071 clk = devm_clk_get(dev, "txco");
1072 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
1073 return clk;
1074
1075 /* Deprecated name */
1076 clk = devm_clk_get(dev, "extclk");
1077 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
1078 return clk;
1079
1080 /* Original code used no name at all */
1081 return devm_clk_get(dev, NULL);
1082}
1083
1084static int bcm_get_resources(struct bcm_device *dev)
1085{
1086 const struct dmi_system_id *broken_irq_dmi_id;
1087 const char *irq_con_id = "host-wakeup";
1088 int err;
1089
1090 dev->name = dev_name(dev->dev);
1091
1092 if (x86_apple_machine && !bcm_apple_get_resources(dev))
1093 return 0;
1094
1095 dev->txco_clk = bcm_get_txco(dev->dev);
1096
1097 /* Handle deferred probing */
1098 if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER))
1099 return PTR_ERR(dev->txco_clk);
1100
1101 /* Ignore all other errors as before */
1102 if (IS_ERR(dev->txco_clk))
1103 dev->txco_clk = NULL;
1104
1105 dev->lpo_clk = devm_clk_get(dev->dev, "lpo");
1106 if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER))
1107 return PTR_ERR(dev->lpo_clk);
1108
1109 if (IS_ERR(dev->lpo_clk))
1110 dev->lpo_clk = NULL;
1111
1112 /* Check if we accidentally fetched the lpo clock twice */
1113 if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) {
1114 devm_clk_put(dev->dev, dev->txco_clk);
1115 dev->txco_clk = NULL;
1116 }
1117
1118 dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
1119 GPIOD_OUT_LOW);
1120 if (IS_ERR(dev->device_wakeup))
1121 return PTR_ERR(dev->device_wakeup);
1122
1123 dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
1124 GPIOD_OUT_LOW);
1125 if (IS_ERR(dev->shutdown))
1126 return PTR_ERR(dev->shutdown);
1127
1128 dev->reset = devm_gpiod_get_optional(dev->dev, "reset",
1129 GPIOD_OUT_LOW);
1130 if (IS_ERR(dev->reset))
1131 return PTR_ERR(dev->reset);
1132
1133 dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
1134 dev->set_shutdown = bcm_gpio_set_shutdown;
1135
1136 dev->supplies[0].supply = "vbat";
1137 dev->supplies[1].supply = "vddio";
1138 err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES,
1139 dev->supplies);
1140 if (err)
1141 return err;
1142
1143 broken_irq_dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
1144 if (broken_irq_dmi_id && broken_irq_dmi_id->driver_data) {
1145 gpiod_add_lookup_table(broken_irq_dmi_id->driver_data);
1146 irq_con_id = "host-wakeup-alt";
1147 dev->irq_active_low = false;
1148 dev->irq = 0;
1149 }
1150
1151 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
1152 if (dev->irq <= 0) {
1153 struct gpio_desc *gpio;
1154
1155 gpio = devm_gpiod_get_optional(dev->dev, irq_con_id, GPIOD_IN);
1156 if (IS_ERR(gpio))
1157 return PTR_ERR(gpio);
1158
1159 dev->irq = gpiod_to_irq(gpio);
1160 }
1161
1162 if (broken_irq_dmi_id) {
1163 if (broken_irq_dmi_id->driver_data) {
1164 gpiod_remove_lookup_table(broken_irq_dmi_id->driver_data);
1165 } else {
1166 dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n",
1167 broken_irq_dmi_id->ident);
1168 dev->irq = 0;
1169 }
1170 }
1171
1172 dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
1173 return 0;
1174}
1175
1176#ifdef CONFIG_ACPI
1177static int bcm_acpi_probe(struct bcm_device *dev)
1178{
1179 LIST_HEAD(resources);
1180 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
1181 struct resource_entry *entry;
1182 int ret;
1183
1184 /* Retrieve UART ACPI info */
1185 dev->gpio_int_idx = -1;
1186 ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
1187 &resources, bcm_resource, dev);
1188 if (ret < 0)
1189 return ret;
1190
1191 resource_list_for_each_entry(entry, &resources) {
1192 if (resource_type(entry->res) == IORESOURCE_IRQ) {
1193 dev->irq = entry->res->start;
1194 break;
1195 }
1196 }
1197 acpi_dev_free_resource_list(&resources);
1198
1199 /* If the DSDT uses an Interrupt resource for the IRQ, then there are
1200 * only 2 GPIO resources, we use the irq-last mapping for this, since
1201 * we already have an irq the 3th / last mapping will not be used.
1202 */
1203 if (dev->irq)
1204 gpio_mapping = acpi_bcm_int_last_gpios;
1205 else if (dev->gpio_int_idx == 0)
1206 gpio_mapping = acpi_bcm_int_first_gpios;
1207 else if (dev->gpio_int_idx == 2)
1208 gpio_mapping = acpi_bcm_int_last_gpios;
1209 else
1210 dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n",
1211 dev->gpio_int_idx);
1212
1213 /* Warn if our expectations are not met. */
1214 if (dev->gpio_count != (dev->irq ? 2 : 3))
1215 dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n",
1216 dev->gpio_count);
1217
1218 ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
1219 if (ret)
1220 return ret;
1221
1222 if (irq_polarity != -1) {
1223 dev->irq_active_low = irq_polarity;
1224 dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n",
1225 dev->irq_active_low ? "low" : "high");
1226 }
1227
1228 return 0;
1229}
1230#else
1231static int bcm_acpi_probe(struct bcm_device *dev)
1232{
1233 return -EINVAL;
1234}
1235#endif /* CONFIG_ACPI */
1236
1237static int bcm_of_probe(struct bcm_device *bdev)
1238{
1239 bdev->use_autobaud_mode = device_property_read_bool(bdev->dev,
1240 "brcm,requires-autobaud-mode");
1241 device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
1242 device_property_read_u8_array(bdev->dev, "brcm,bt-pcm-int-params",
1243 bdev->pcm_int_params, 5);
1244 bdev->irq = of_irq_get_byname(bdev->dev->of_node, "host-wakeup");
1245 bdev->irq_active_low = irq_get_trigger_type(bdev->irq)
1246 & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW);
1247 return 0;
1248}
1249
1250static int bcm_probe(struct platform_device *pdev)
1251{
1252 struct bcm_device *dev;
1253 int ret;
1254
1255 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1256 if (!dev)
1257 return -ENOMEM;
1258
1259 dev->dev = &pdev->dev;
1260
1261 ret = platform_get_irq(pdev, 0);
1262 if (ret < 0)
1263 return ret;
1264
1265 dev->irq = ret;
1266
1267 /* Initialize routing field to an unused value */
1268 dev->pcm_int_params[0] = 0xff;
1269
1270 if (has_acpi_companion(&pdev->dev)) {
1271 ret = bcm_acpi_probe(dev);
1272 if (ret)
1273 return ret;
1274 }
1275
1276 ret = bcm_get_resources(dev);
1277 if (ret)
1278 return ret;
1279
1280 platform_set_drvdata(pdev, dev);
1281
1282 dev_info(&pdev->dev, "%s device registered.\n", dev->name);
1283
1284 /* Place this instance on the device list */
1285 mutex_lock(&bcm_device_lock);
1286 list_add_tail(&dev->list, &bcm_device_list);
1287 mutex_unlock(&bcm_device_lock);
1288
1289 ret = bcm_gpio_set_power(dev, false);
1290 if (ret)
1291 dev_err(&pdev->dev, "Failed to power down\n");
1292
1293 return 0;
1294}
1295
1296static int bcm_remove(struct platform_device *pdev)
1297{
1298 struct bcm_device *dev = platform_get_drvdata(pdev);
1299
1300 mutex_lock(&bcm_device_lock);
1301 list_del(&dev->list);
1302 mutex_unlock(&bcm_device_lock);
1303
1304 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
1305
1306 return 0;
1307}
1308
1309static const struct hci_uart_proto bcm_proto = {
1310 .id = HCI_UART_BCM,
1311 .name = "Broadcom",
1312 .manufacturer = 15,
1313 .init_speed = 115200,
1314 .open = bcm_open,
1315 .close = bcm_close,
1316 .flush = bcm_flush,
1317 .setup = bcm_setup,
1318 .set_baudrate = bcm_set_baudrate,
1319 .recv = bcm_recv,
1320 .enqueue = bcm_enqueue,
1321 .dequeue = bcm_dequeue,
1322};
1323
1324#ifdef CONFIG_ACPI
1325
1326/* bcm43430a0/a1 BT does not support 48MHz UART clock, limit to 2000000 baud */
1327static struct bcm_device_data bcm43430_device_data = {
1328 .max_speed = 2000000,
1329};
1330
1331static const struct acpi_device_id bcm_acpi_match[] = {
1332 { "BCM2E00" },
1333 { "BCM2E01" },
1334 { "BCM2E02" },
1335 { "BCM2E03" },
1336 { "BCM2E04" },
1337 { "BCM2E05" },
1338 { "BCM2E06" },
1339 { "BCM2E07" },
1340 { "BCM2E08" },
1341 { "BCM2E09" },
1342 { "BCM2E0A" },
1343 { "BCM2E0B" },
1344 { "BCM2E0C" },
1345 { "BCM2E0D" },
1346 { "BCM2E0E" },
1347 { "BCM2E0F" },
1348 { "BCM2E10" },
1349 { "BCM2E11" },
1350 { "BCM2E12" },
1351 { "BCM2E13" },
1352 { "BCM2E14" },
1353 { "BCM2E15" },
1354 { "BCM2E16" },
1355 { "BCM2E17" },
1356 { "BCM2E18" },
1357 { "BCM2E19" },
1358 { "BCM2E1A" },
1359 { "BCM2E1B" },
1360 { "BCM2E1C" },
1361 { "BCM2E1D" },
1362 { "BCM2E1F" },
1363 { "BCM2E20" },
1364 { "BCM2E21" },
1365 { "BCM2E22" },
1366 { "BCM2E23" },
1367 { "BCM2E24" },
1368 { "BCM2E25" },
1369 { "BCM2E26" },
1370 { "BCM2E27" },
1371 { "BCM2E28" },
1372 { "BCM2E29" },
1373 { "BCM2E2A" },
1374 { "BCM2E2B" },
1375 { "BCM2E2C" },
1376 { "BCM2E2D" },
1377 { "BCM2E2E" },
1378 { "BCM2E2F" },
1379 { "BCM2E30" },
1380 { "BCM2E31" },
1381 { "BCM2E32" },
1382 { "BCM2E33" },
1383 { "BCM2E34" },
1384 { "BCM2E35" },
1385 { "BCM2E36" },
1386 { "BCM2E37" },
1387 { "BCM2E38" },
1388 { "BCM2E39" },
1389 { "BCM2E3A" },
1390 { "BCM2E3B" },
1391 { "BCM2E3C" },
1392 { "BCM2E3D" },
1393 { "BCM2E3E" },
1394 { "BCM2E3F" },
1395 { "BCM2E40" },
1396 { "BCM2E41" },
1397 { "BCM2E42" },
1398 { "BCM2E43" },
1399 { "BCM2E44" },
1400 { "BCM2E45" },
1401 { "BCM2E46" },
1402 { "BCM2E47" },
1403 { "BCM2E48" },
1404 { "BCM2E49" },
1405 { "BCM2E4A" },
1406 { "BCM2E4B" },
1407 { "BCM2E4C" },
1408 { "BCM2E4D" },
1409 { "BCM2E4E" },
1410 { "BCM2E4F" },
1411 { "BCM2E50" },
1412 { "BCM2E51" },
1413 { "BCM2E52" },
1414 { "BCM2E53" },
1415 { "BCM2E54" },
1416 { "BCM2E55" },
1417 { "BCM2E56" },
1418 { "BCM2E57" },
1419 { "BCM2E58" },
1420 { "BCM2E59" },
1421 { "BCM2E5A" },
1422 { "BCM2E5B" },
1423 { "BCM2E5C" },
1424 { "BCM2E5D" },
1425 { "BCM2E5E" },
1426 { "BCM2E5F" },
1427 { "BCM2E60" },
1428 { "BCM2E61" },
1429 { "BCM2E62" },
1430 { "BCM2E63" },
1431 { "BCM2E64" },
1432 { "BCM2E65" },
1433 { "BCM2E66" },
1434 { "BCM2E67" },
1435 { "BCM2E68" },
1436 { "BCM2E69" },
1437 { "BCM2E6B" },
1438 { "BCM2E6D" },
1439 { "BCM2E6E" },
1440 { "BCM2E6F" },
1441 { "BCM2E70" },
1442 { "BCM2E71" },
1443 { "BCM2E72" },
1444 { "BCM2E73" },
1445 { "BCM2E74", (long)&bcm43430_device_data },
1446 { "BCM2E75", (long)&bcm43430_device_data },
1447 { "BCM2E76" },
1448 { "BCM2E77" },
1449 { "BCM2E78" },
1450 { "BCM2E79" },
1451 { "BCM2E7A" },
1452 { "BCM2E7B", (long)&bcm43430_device_data },
1453 { "BCM2E7C" },
1454 { "BCM2E7D" },
1455 { "BCM2E7E" },
1456 { "BCM2E7F" },
1457 { "BCM2E80", (long)&bcm43430_device_data },
1458 { "BCM2E81" },
1459 { "BCM2E82" },
1460 { "BCM2E83" },
1461 { "BCM2E84" },
1462 { "BCM2E85" },
1463 { "BCM2E86" },
1464 { "BCM2E87" },
1465 { "BCM2E88" },
1466 { "BCM2E89", (long)&bcm43430_device_data },
1467 { "BCM2E8A" },
1468 { "BCM2E8B" },
1469 { "BCM2E8C" },
1470 { "BCM2E8D" },
1471 { "BCM2E8E" },
1472 { "BCM2E90" },
1473 { "BCM2E92" },
1474 { "BCM2E93" },
1475 { "BCM2E94", (long)&bcm43430_device_data },
1476 { "BCM2E95" },
1477 { "BCM2E96" },
1478 { "BCM2E97" },
1479 { "BCM2E98" },
1480 { "BCM2E99", (long)&bcm43430_device_data },
1481 { "BCM2E9A" },
1482 { "BCM2E9B", (long)&bcm43430_device_data },
1483 { "BCM2E9C" },
1484 { "BCM2E9D" },
1485 { "BCM2E9F", (long)&bcm43430_device_data },
1486 { "BCM2EA0" },
1487 { "BCM2EA1" },
1488 { "BCM2EA2", (long)&bcm43430_device_data },
1489 { "BCM2EA3", (long)&bcm43430_device_data },
1490 { "BCM2EA4" },
1491 { "BCM2EA5" },
1492 { "BCM2EA6" },
1493 { "BCM2EA7" },
1494 { "BCM2EA8" },
1495 { "BCM2EA9" },
1496 { "BCM2EAA", (long)&bcm43430_device_data },
1497 { "BCM2EAB", (long)&bcm43430_device_data },
1498 { "BCM2EAC", (long)&bcm43430_device_data },
1499 { },
1500};
1501MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
1502#endif
1503
1504/* suspend and resume callbacks */
1505static const struct dev_pm_ops bcm_pm_ops = {
1506 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
1507 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
1508};
1509
1510static struct platform_driver bcm_driver = {
1511 .probe = bcm_probe,
1512 .remove = bcm_remove,
1513 .driver = {
1514 .name = "hci_bcm",
1515 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1516 .pm = &bcm_pm_ops,
1517 },
1518};
1519
1520static int bcm_serdev_probe(struct serdev_device *serdev)
1521{
1522 struct bcm_device *bcmdev;
1523 const struct bcm_device_data *data;
1524 int err;
1525
1526 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
1527 if (!bcmdev)
1528 return -ENOMEM;
1529
1530 bcmdev->dev = &serdev->dev;
1531#ifdef CONFIG_PM
1532 bcmdev->hu = &bcmdev->serdev_hu;
1533#endif
1534 bcmdev->serdev_hu.serdev = serdev;
1535 serdev_device_set_drvdata(serdev, bcmdev);
1536
1537 /* Initialize routing field to an unused value */
1538 bcmdev->pcm_int_params[0] = 0xff;
1539
1540 if (has_acpi_companion(&serdev->dev))
1541 err = bcm_acpi_probe(bcmdev);
1542 else
1543 err = bcm_of_probe(bcmdev);
1544 if (err)
1545 return err;
1546
1547 err = bcm_get_resources(bcmdev);
1548 if (err)
1549 return err;
1550
1551 if (!bcmdev->shutdown) {
1552 dev_warn(&serdev->dev,
1553 "No reset resource, using default baud rate\n");
1554 bcmdev->oper_speed = bcmdev->init_speed;
1555 }
1556
1557 err = bcm_gpio_set_power(bcmdev, false);
1558 if (err)
1559 dev_err(&serdev->dev, "Failed to power down\n");
1560
1561 data = device_get_match_data(bcmdev->dev);
1562 if (data) {
1563 bcmdev->max_autobaud_speed = data->max_autobaud_speed;
1564 bcmdev->no_early_set_baudrate = data->no_early_set_baudrate;
1565 bcmdev->drive_rts_on_open = data->drive_rts_on_open;
1566 bcmdev->no_uart_clock_set = data->no_uart_clock_set;
1567 if (data->max_speed && bcmdev->oper_speed > data->max_speed)
1568 bcmdev->oper_speed = data->max_speed;
1569 }
1570
1571 return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
1572}
1573
1574static void bcm_serdev_remove(struct serdev_device *serdev)
1575{
1576 struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
1577
1578 hci_uart_unregister_device(&bcmdev->serdev_hu);
1579}
1580
1581#ifdef CONFIG_OF
1582static struct bcm_device_data bcm4354_device_data = {
1583 .no_early_set_baudrate = true,
1584};
1585
1586static struct bcm_device_data bcm43438_device_data = {
1587 .drive_rts_on_open = true,
1588};
1589
1590static struct bcm_device_data cyw4373a0_device_data = {
1591 .no_uart_clock_set = true,
1592};
1593
1594static struct bcm_device_data cyw55572_device_data = {
1595 .max_autobaud_speed = 921600,
1596};
1597
1598static const struct of_device_id bcm_bluetooth_of_match[] = {
1599 { .compatible = "brcm,bcm20702a1" },
1600 { .compatible = "brcm,bcm4329-bt" },
1601 { .compatible = "brcm,bcm4330-bt" },
1602 { .compatible = "brcm,bcm4334-bt" },
1603 { .compatible = "brcm,bcm4345c5" },
1604 { .compatible = "brcm,bcm43430a0-bt" },
1605 { .compatible = "brcm,bcm43430a1-bt" },
1606 { .compatible = "brcm,bcm43438-bt", .data = &bcm43438_device_data },
1607 { .compatible = "brcm,bcm4349-bt", .data = &bcm43438_device_data },
1608 { .compatible = "brcm,bcm43540-bt", .data = &bcm4354_device_data },
1609 { .compatible = "brcm,bcm4335a0" },
1610 { .compatible = "cypress,cyw4373a0-bt", .data = &cyw4373a0_device_data },
1611 { .compatible = "infineon,cyw55572-bt", .data = &cyw55572_device_data },
1612 { },
1613};
1614MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
1615#endif
1616
1617static struct serdev_device_driver bcm_serdev_driver = {
1618 .probe = bcm_serdev_probe,
1619 .remove = bcm_serdev_remove,
1620 .driver = {
1621 .name = "hci_uart_bcm",
1622 .of_match_table = of_match_ptr(bcm_bluetooth_of_match),
1623 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1624 .pm = &bcm_pm_ops,
1625 },
1626};
1627
1628int __init bcm_init(void)
1629{
1630 /* For now, we need to keep both platform device
1631 * driver (ACPI generated) and serdev driver (DT).
1632 */
1633 platform_driver_register(&bcm_driver);
1634 serdev_device_driver_register(&bcm_serdev_driver);
1635
1636 return hci_uart_register_proto(&bcm_proto);
1637}
1638
1639int __exit bcm_deinit(void)
1640{
1641 platform_driver_unregister(&bcm_driver);
1642 serdev_device_driver_unregister(&bcm_serdev_driver);
1643
1644 return hci_uart_unregister_proto(&bcm_proto);
1645}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Bluetooth HCI UART driver for Broadcom devices
5 *
6 * Copyright (C) 2015 Intel Corporation
7 */
8
9#include <linux/kernel.h>
10#include <linux/errno.h>
11#include <linux/skbuff.h>
12#include <linux/firmware.h>
13#include <linux/module.h>
14#include <linux/acpi.h>
15#include <linux/of.h>
16#include <linux/of_irq.h>
17#include <linux/property.h>
18#include <linux/platform_data/x86/apple.h>
19#include <linux/platform_device.h>
20#include <linux/regulator/consumer.h>
21#include <linux/clk.h>
22#include <linux/gpio/consumer.h>
23#include <linux/tty.h>
24#include <linux/interrupt.h>
25#include <linux/dmi.h>
26#include <linux/pm_runtime.h>
27#include <linux/serdev.h>
28
29#include <net/bluetooth/bluetooth.h>
30#include <net/bluetooth/hci_core.h>
31
32#include "btbcm.h"
33#include "hci_uart.h"
34
35#define BCM_NULL_PKT 0x00
36#define BCM_NULL_SIZE 0
37
38#define BCM_LM_DIAG_PKT 0x07
39#define BCM_LM_DIAG_SIZE 63
40
41#define BCM_TYPE49_PKT 0x31
42#define BCM_TYPE49_SIZE 0
43
44#define BCM_TYPE52_PKT 0x34
45#define BCM_TYPE52_SIZE 0
46
47#define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
48
49#define BCM_NUM_SUPPLIES 2
50
51/**
52 * struct bcm_device_data - device specific data
53 * @no_early_set_baudrate: Disallow set baudrate before driver setup()
54 */
55struct bcm_device_data {
56 bool no_early_set_baudrate;
57 bool drive_rts_on_open;
58};
59
60/**
61 * struct bcm_device - device driver resources
62 * @serdev_hu: HCI UART controller struct
63 * @list: bcm_device_list node
64 * @dev: physical UART slave
65 * @name: device name logged by bt_dev_*() functions
66 * @device_wakeup: BT_WAKE pin,
67 * assert = Bluetooth device must wake up or remain awake,
68 * deassert = Bluetooth device may sleep when sleep criteria are met
69 * @shutdown: BT_REG_ON pin,
70 * power up or power down Bluetooth device internal regulators
71 * @reset: BT_RST_N pin,
72 * active low resets the Bluetooth logic core
73 * @set_device_wakeup: callback to toggle BT_WAKE pin
74 * either by accessing @device_wakeup or by calling @btlp
75 * @set_shutdown: callback to toggle BT_REG_ON pin
76 * either by accessing @shutdown or by calling @btpu/@btpd
77 * @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power")
78 * @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up")
79 * @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down")
80 * @txco_clk: external reference frequency clock used by Bluetooth device
81 * @lpo_clk: external LPO clock used by Bluetooth device
82 * @supplies: VBAT and VDDIO supplies used by Bluetooth device
83 * @res_enabled: whether clocks and supplies are prepared and enabled
84 * @init_speed: default baudrate of Bluetooth device;
85 * the host UART is initially set to this baudrate so that
86 * it can configure the Bluetooth device for @oper_speed
87 * @oper_speed: preferred baudrate of Bluetooth device;
88 * set to 0 if @init_speed is already the preferred baudrate
89 * @irq: interrupt triggered by HOST_WAKE_BT pin
90 * @irq_active_low: whether @irq is active low
91 * @hu: pointer to HCI UART controller struct,
92 * used to disable flow control during runtime suspend and system sleep
93 * @is_suspended: whether flow control is currently disabled
94 * @no_early_set_baudrate: don't set_baudrate before setup()
95 */
96struct bcm_device {
97 /* Must be the first member, hci_serdev.c expects this. */
98 struct hci_uart serdev_hu;
99 struct list_head list;
100
101 struct device *dev;
102
103 const char *name;
104 struct gpio_desc *device_wakeup;
105 struct gpio_desc *shutdown;
106 struct gpio_desc *reset;
107 int (*set_device_wakeup)(struct bcm_device *, bool);
108 int (*set_shutdown)(struct bcm_device *, bool);
109#ifdef CONFIG_ACPI
110 acpi_handle btlp, btpu, btpd;
111 int gpio_count;
112 int gpio_int_idx;
113#endif
114
115 struct clk *txco_clk;
116 struct clk *lpo_clk;
117 struct regulator_bulk_data supplies[BCM_NUM_SUPPLIES];
118 bool res_enabled;
119
120 u32 init_speed;
121 u32 oper_speed;
122 int irq;
123 bool irq_active_low;
124 bool irq_acquired;
125
126#ifdef CONFIG_PM
127 struct hci_uart *hu;
128 bool is_suspended;
129#endif
130 bool no_early_set_baudrate;
131 bool drive_rts_on_open;
132 u8 pcm_int_params[5];
133};
134
135/* generic bcm uart resources */
136struct bcm_data {
137 struct sk_buff *rx_skb;
138 struct sk_buff_head txq;
139
140 struct bcm_device *dev;
141};
142
143/* List of BCM BT UART devices */
144static DEFINE_MUTEX(bcm_device_lock);
145static LIST_HEAD(bcm_device_list);
146
147static int irq_polarity = -1;
148module_param(irq_polarity, int, 0444);
149MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low");
150
151static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
152{
153 if (hu->serdev)
154 serdev_device_set_baudrate(hu->serdev, speed);
155 else
156 hci_uart_set_baudrate(hu, speed);
157}
158
159static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
160{
161 struct hci_dev *hdev = hu->hdev;
162 struct sk_buff *skb;
163 struct bcm_update_uart_baud_rate param;
164
165 if (speed > 3000000) {
166 struct bcm_write_uart_clock_setting clock;
167
168 clock.type = BCM_UART_CLOCK_48MHZ;
169
170 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
171
172 /* This Broadcom specific command changes the UART's controller
173 * clock for baud rate > 3000000.
174 */
175 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
176 if (IS_ERR(skb)) {
177 int err = PTR_ERR(skb);
178 bt_dev_err(hdev, "BCM: failed to write clock (%d)",
179 err);
180 return err;
181 }
182
183 kfree_skb(skb);
184 }
185
186 bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
187
188 param.zero = cpu_to_le16(0);
189 param.baud_rate = cpu_to_le32(speed);
190
191 /* This Broadcom specific command changes the UART's controller baud
192 * rate.
193 */
194 skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), ¶m,
195 HCI_INIT_TIMEOUT);
196 if (IS_ERR(skb)) {
197 int err = PTR_ERR(skb);
198 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
199 err);
200 return err;
201 }
202
203 kfree_skb(skb);
204
205 return 0;
206}
207
208/* bcm_device_exists should be protected by bcm_device_lock */
209static bool bcm_device_exists(struct bcm_device *device)
210{
211 struct list_head *p;
212
213#ifdef CONFIG_PM
214 /* Devices using serdev always exist */
215 if (device && device->hu && device->hu->serdev)
216 return true;
217#endif
218
219 list_for_each(p, &bcm_device_list) {
220 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
221
222 if (device == dev)
223 return true;
224 }
225
226 return false;
227}
228
229static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
230{
231 int err;
232
233 if (powered && !dev->res_enabled) {
234 /* Intel Macs use bcm_apple_get_resources() and don't
235 * have regulator supplies configured.
236 */
237 if (dev->supplies[0].supply) {
238 err = regulator_bulk_enable(BCM_NUM_SUPPLIES,
239 dev->supplies);
240 if (err)
241 return err;
242 }
243
244 /* LPO clock needs to be 32.768 kHz */
245 err = clk_set_rate(dev->lpo_clk, 32768);
246 if (err) {
247 dev_err(dev->dev, "Could not set LPO clock rate\n");
248 goto err_regulator_disable;
249 }
250
251 err = clk_prepare_enable(dev->lpo_clk);
252 if (err)
253 goto err_regulator_disable;
254
255 err = clk_prepare_enable(dev->txco_clk);
256 if (err)
257 goto err_lpo_clk_disable;
258 }
259
260 err = dev->set_shutdown(dev, powered);
261 if (err)
262 goto err_txco_clk_disable;
263
264 err = dev->set_device_wakeup(dev, powered);
265 if (err)
266 goto err_revert_shutdown;
267
268 if (!powered && dev->res_enabled) {
269 clk_disable_unprepare(dev->txco_clk);
270 clk_disable_unprepare(dev->lpo_clk);
271
272 /* Intel Macs use bcm_apple_get_resources() and don't
273 * have regulator supplies configured.
274 */
275 if (dev->supplies[0].supply)
276 regulator_bulk_disable(BCM_NUM_SUPPLIES,
277 dev->supplies);
278 }
279
280 /* wait for device to power on and come out of reset */
281 usleep_range(100000, 120000);
282
283 dev->res_enabled = powered;
284
285 return 0;
286
287err_revert_shutdown:
288 dev->set_shutdown(dev, !powered);
289err_txco_clk_disable:
290 if (powered && !dev->res_enabled)
291 clk_disable_unprepare(dev->txco_clk);
292err_lpo_clk_disable:
293 if (powered && !dev->res_enabled)
294 clk_disable_unprepare(dev->lpo_clk);
295err_regulator_disable:
296 if (powered && !dev->res_enabled)
297 regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies);
298 return err;
299}
300
301#ifdef CONFIG_PM
302static irqreturn_t bcm_host_wake(int irq, void *data)
303{
304 struct bcm_device *bdev = data;
305
306 bt_dev_dbg(bdev, "Host wake IRQ");
307
308 pm_runtime_get(bdev->dev);
309 pm_runtime_mark_last_busy(bdev->dev);
310 pm_runtime_put_autosuspend(bdev->dev);
311
312 return IRQ_HANDLED;
313}
314
315static int bcm_request_irq(struct bcm_data *bcm)
316{
317 struct bcm_device *bdev = bcm->dev;
318 int err;
319
320 mutex_lock(&bcm_device_lock);
321 if (!bcm_device_exists(bdev)) {
322 err = -ENODEV;
323 goto unlock;
324 }
325
326 if (bdev->irq <= 0) {
327 err = -EOPNOTSUPP;
328 goto unlock;
329 }
330
331 err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake,
332 bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
333 IRQF_TRIGGER_RISING,
334 "host_wake", bdev);
335 if (err) {
336 bdev->irq = err;
337 goto unlock;
338 }
339
340 bdev->irq_acquired = true;
341
342 device_init_wakeup(bdev->dev, true);
343
344 pm_runtime_set_autosuspend_delay(bdev->dev,
345 BCM_AUTOSUSPEND_DELAY);
346 pm_runtime_use_autosuspend(bdev->dev);
347 pm_runtime_set_active(bdev->dev);
348 pm_runtime_enable(bdev->dev);
349
350unlock:
351 mutex_unlock(&bcm_device_lock);
352
353 return err;
354}
355
356static const struct bcm_set_sleep_mode default_sleep_params = {
357 .sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
358 .idle_host = 2, /* idle threshold HOST, in 300ms */
359 .idle_dev = 2, /* idle threshold device, in 300ms */
360 .bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */
361 .host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */
362 .allow_host_sleep = 1, /* Allow host sleep in SCO flag */
363 .combine_modes = 1, /* Combine sleep and LPM flag */
364 .tristate_control = 0, /* Allow tri-state control of UART tx flag */
365 /* Irrelevant USB flags */
366 .usb_auto_sleep = 0,
367 .usb_resume_timeout = 0,
368 .break_to_host = 0,
369 .pulsed_host_wake = 1,
370};
371
372static int bcm_setup_sleep(struct hci_uart *hu)
373{
374 struct bcm_data *bcm = hu->priv;
375 struct sk_buff *skb;
376 struct bcm_set_sleep_mode sleep_params = default_sleep_params;
377
378 sleep_params.host_wake_active = !bcm->dev->irq_active_low;
379
380 skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
381 &sleep_params, HCI_INIT_TIMEOUT);
382 if (IS_ERR(skb)) {
383 int err = PTR_ERR(skb);
384 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
385 return err;
386 }
387 kfree_skb(skb);
388
389 bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
390
391 return 0;
392}
393#else
394static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
395static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
396#endif
397
398static int bcm_set_diag(struct hci_dev *hdev, bool enable)
399{
400 struct hci_uart *hu = hci_get_drvdata(hdev);
401 struct bcm_data *bcm = hu->priv;
402 struct sk_buff *skb;
403
404 if (!test_bit(HCI_RUNNING, &hdev->flags))
405 return -ENETDOWN;
406
407 skb = bt_skb_alloc(3, GFP_KERNEL);
408 if (!skb)
409 return -ENOMEM;
410
411 skb_put_u8(skb, BCM_LM_DIAG_PKT);
412 skb_put_u8(skb, 0xf0);
413 skb_put_u8(skb, enable);
414
415 skb_queue_tail(&bcm->txq, skb);
416 hci_uart_tx_wakeup(hu);
417
418 return 0;
419}
420
421static int bcm_open(struct hci_uart *hu)
422{
423 struct bcm_data *bcm;
424 struct list_head *p;
425 int err;
426
427 bt_dev_dbg(hu->hdev, "hu %p", hu);
428
429 if (!hci_uart_has_flow_control(hu))
430 return -EOPNOTSUPP;
431
432 bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
433 if (!bcm)
434 return -ENOMEM;
435
436 skb_queue_head_init(&bcm->txq);
437
438 hu->priv = bcm;
439
440 mutex_lock(&bcm_device_lock);
441
442 if (hu->serdev) {
443 bcm->dev = serdev_device_get_drvdata(hu->serdev);
444 goto out;
445 }
446
447 if (!hu->tty->dev)
448 goto out;
449
450 list_for_each(p, &bcm_device_list) {
451 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
452
453 /* Retrieve saved bcm_device based on parent of the
454 * platform device (saved during device probe) and
455 * parent of tty device used by hci_uart
456 */
457 if (hu->tty->dev->parent == dev->dev->parent) {
458 bcm->dev = dev;
459#ifdef CONFIG_PM
460 dev->hu = hu;
461#endif
462 break;
463 }
464 }
465
466out:
467 if (bcm->dev) {
468 if (bcm->dev->drive_rts_on_open)
469 hci_uart_set_flow_control(hu, true);
470
471 hu->init_speed = bcm->dev->init_speed;
472
473 /* If oper_speed is set, ldisc/serdev will set the baudrate
474 * before calling setup()
475 */
476 if (!bcm->dev->no_early_set_baudrate)
477 hu->oper_speed = bcm->dev->oper_speed;
478
479 err = bcm_gpio_set_power(bcm->dev, true);
480
481 if (bcm->dev->drive_rts_on_open)
482 hci_uart_set_flow_control(hu, false);
483
484 if (err)
485 goto err_unset_hu;
486 }
487
488 mutex_unlock(&bcm_device_lock);
489 return 0;
490
491err_unset_hu:
492#ifdef CONFIG_PM
493 if (!hu->serdev)
494 bcm->dev->hu = NULL;
495#endif
496 mutex_unlock(&bcm_device_lock);
497 hu->priv = NULL;
498 kfree(bcm);
499 return err;
500}
501
502static int bcm_close(struct hci_uart *hu)
503{
504 struct bcm_data *bcm = hu->priv;
505 struct bcm_device *bdev = NULL;
506 int err;
507
508 bt_dev_dbg(hu->hdev, "hu %p", hu);
509
510 /* Protect bcm->dev against removal of the device or driver */
511 mutex_lock(&bcm_device_lock);
512
513 if (hu->serdev) {
514 bdev = serdev_device_get_drvdata(hu->serdev);
515 } else if (bcm_device_exists(bcm->dev)) {
516 bdev = bcm->dev;
517#ifdef CONFIG_PM
518 bdev->hu = NULL;
519#endif
520 }
521
522 if (bdev) {
523 if (IS_ENABLED(CONFIG_PM) && bdev->irq_acquired) {
524 devm_free_irq(bdev->dev, bdev->irq, bdev);
525 device_init_wakeup(bdev->dev, false);
526 pm_runtime_disable(bdev->dev);
527 }
528
529 err = bcm_gpio_set_power(bdev, false);
530 if (err)
531 bt_dev_err(hu->hdev, "Failed to power down");
532 else
533 pm_runtime_set_suspended(bdev->dev);
534 }
535 mutex_unlock(&bcm_device_lock);
536
537 skb_queue_purge(&bcm->txq);
538 kfree_skb(bcm->rx_skb);
539 kfree(bcm);
540
541 hu->priv = NULL;
542 return 0;
543}
544
545static int bcm_flush(struct hci_uart *hu)
546{
547 struct bcm_data *bcm = hu->priv;
548
549 bt_dev_dbg(hu->hdev, "hu %p", hu);
550
551 skb_queue_purge(&bcm->txq);
552
553 return 0;
554}
555
556static int bcm_setup(struct hci_uart *hu)
557{
558 struct bcm_data *bcm = hu->priv;
559 bool fw_load_done = false;
560 unsigned int speed;
561 int err;
562
563 bt_dev_dbg(hu->hdev, "hu %p", hu);
564
565 hu->hdev->set_diag = bcm_set_diag;
566 hu->hdev->set_bdaddr = btbcm_set_bdaddr;
567
568 err = btbcm_initialize(hu->hdev, &fw_load_done);
569 if (err)
570 return err;
571
572 if (!fw_load_done)
573 return 0;
574
575 /* Init speed if any */
576 if (hu->init_speed)
577 speed = hu->init_speed;
578 else if (hu->proto->init_speed)
579 speed = hu->proto->init_speed;
580 else
581 speed = 0;
582
583 if (speed)
584 host_set_baudrate(hu, speed);
585
586 /* Operational speed if any */
587 if (hu->oper_speed)
588 speed = hu->oper_speed;
589 else if (bcm->dev && bcm->dev->oper_speed)
590 speed = bcm->dev->oper_speed;
591 else if (hu->proto->oper_speed)
592 speed = hu->proto->oper_speed;
593 else
594 speed = 0;
595
596 if (speed) {
597 err = bcm_set_baudrate(hu, speed);
598 if (!err)
599 host_set_baudrate(hu, speed);
600 }
601
602 /* PCM parameters if provided */
603 if (bcm->dev && bcm->dev->pcm_int_params[0] != 0xff) {
604 struct bcm_set_pcm_int_params params;
605
606 btbcm_read_pcm_int_params(hu->hdev, ¶ms);
607
608 memcpy(¶ms, bcm->dev->pcm_int_params, 5);
609 btbcm_write_pcm_int_params(hu->hdev, ¶ms);
610 }
611
612 err = btbcm_finalize(hu->hdev, &fw_load_done);
613 if (err)
614 return err;
615
616 /* Some devices ship with the controller default address.
617 * Allow the bootloader to set a valid address through the
618 * device tree.
619 */
620 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hu->hdev->quirks);
621
622 if (!bcm_request_irq(bcm))
623 err = bcm_setup_sleep(hu);
624
625 return err;
626}
627
628#define BCM_RECV_LM_DIAG \
629 .type = BCM_LM_DIAG_PKT, \
630 .hlen = BCM_LM_DIAG_SIZE, \
631 .loff = 0, \
632 .lsize = 0, \
633 .maxlen = BCM_LM_DIAG_SIZE
634
635#define BCM_RECV_NULL \
636 .type = BCM_NULL_PKT, \
637 .hlen = BCM_NULL_SIZE, \
638 .loff = 0, \
639 .lsize = 0, \
640 .maxlen = BCM_NULL_SIZE
641
642#define BCM_RECV_TYPE49 \
643 .type = BCM_TYPE49_PKT, \
644 .hlen = BCM_TYPE49_SIZE, \
645 .loff = 0, \
646 .lsize = 0, \
647 .maxlen = BCM_TYPE49_SIZE
648
649#define BCM_RECV_TYPE52 \
650 .type = BCM_TYPE52_PKT, \
651 .hlen = BCM_TYPE52_SIZE, \
652 .loff = 0, \
653 .lsize = 0, \
654 .maxlen = BCM_TYPE52_SIZE
655
656static const struct h4_recv_pkt bcm_recv_pkts[] = {
657 { H4_RECV_ACL, .recv = hci_recv_frame },
658 { H4_RECV_SCO, .recv = hci_recv_frame },
659 { H4_RECV_EVENT, .recv = hci_recv_frame },
660 { H4_RECV_ISO, .recv = hci_recv_frame },
661 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag },
662 { BCM_RECV_NULL, .recv = hci_recv_diag },
663 { BCM_RECV_TYPE49, .recv = hci_recv_diag },
664 { BCM_RECV_TYPE52, .recv = hci_recv_diag },
665};
666
667static int bcm_recv(struct hci_uart *hu, const void *data, int count)
668{
669 struct bcm_data *bcm = hu->priv;
670
671 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
672 return -EUNATCH;
673
674 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
675 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
676 if (IS_ERR(bcm->rx_skb)) {
677 int err = PTR_ERR(bcm->rx_skb);
678 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
679 bcm->rx_skb = NULL;
680 return err;
681 } else if (!bcm->rx_skb) {
682 /* Delay auto-suspend when receiving completed packet */
683 mutex_lock(&bcm_device_lock);
684 if (bcm->dev && bcm_device_exists(bcm->dev)) {
685 pm_runtime_get(bcm->dev->dev);
686 pm_runtime_mark_last_busy(bcm->dev->dev);
687 pm_runtime_put_autosuspend(bcm->dev->dev);
688 }
689 mutex_unlock(&bcm_device_lock);
690 }
691
692 return count;
693}
694
695static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
696{
697 struct bcm_data *bcm = hu->priv;
698
699 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
700
701 /* Prepend skb with frame type */
702 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
703 skb_queue_tail(&bcm->txq, skb);
704
705 return 0;
706}
707
708static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
709{
710 struct bcm_data *bcm = hu->priv;
711 struct sk_buff *skb = NULL;
712 struct bcm_device *bdev = NULL;
713
714 mutex_lock(&bcm_device_lock);
715
716 if (bcm_device_exists(bcm->dev)) {
717 bdev = bcm->dev;
718 pm_runtime_get_sync(bdev->dev);
719 /* Shall be resumed here */
720 }
721
722 skb = skb_dequeue(&bcm->txq);
723
724 if (bdev) {
725 pm_runtime_mark_last_busy(bdev->dev);
726 pm_runtime_put_autosuspend(bdev->dev);
727 }
728
729 mutex_unlock(&bcm_device_lock);
730
731 return skb;
732}
733
734#ifdef CONFIG_PM
735static int bcm_suspend_device(struct device *dev)
736{
737 struct bcm_device *bdev = dev_get_drvdata(dev);
738 int err;
739
740 bt_dev_dbg(bdev, "");
741
742 if (!bdev->is_suspended && bdev->hu) {
743 hci_uart_set_flow_control(bdev->hu, true);
744
745 /* Once this returns, driver suspends BT via GPIO */
746 bdev->is_suspended = true;
747 }
748
749 /* Suspend the device */
750 err = bdev->set_device_wakeup(bdev, false);
751 if (err) {
752 if (bdev->is_suspended && bdev->hu) {
753 bdev->is_suspended = false;
754 hci_uart_set_flow_control(bdev->hu, false);
755 }
756 return -EBUSY;
757 }
758
759 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
760 msleep(15);
761
762 return 0;
763}
764
765static int bcm_resume_device(struct device *dev)
766{
767 struct bcm_device *bdev = dev_get_drvdata(dev);
768 int err;
769
770 bt_dev_dbg(bdev, "");
771
772 err = bdev->set_device_wakeup(bdev, true);
773 if (err) {
774 dev_err(dev, "Failed to power up\n");
775 return err;
776 }
777
778 bt_dev_dbg(bdev, "resume, delaying 15 ms");
779 msleep(15);
780
781 /* When this executes, the device has woken up already */
782 if (bdev->is_suspended && bdev->hu) {
783 bdev->is_suspended = false;
784
785 hci_uart_set_flow_control(bdev->hu, false);
786 }
787
788 return 0;
789}
790#endif
791
792#ifdef CONFIG_PM_SLEEP
793/* suspend callback */
794static int bcm_suspend(struct device *dev)
795{
796 struct bcm_device *bdev = dev_get_drvdata(dev);
797 int error;
798
799 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
800
801 /*
802 * When used with a device instantiated as platform_device, bcm_suspend
803 * can be called at any time as long as the platform device is bound,
804 * so it should use bcm_device_lock to protect access to hci_uart
805 * and device_wake-up GPIO.
806 */
807 mutex_lock(&bcm_device_lock);
808
809 if (!bdev->hu)
810 goto unlock;
811
812 if (pm_runtime_active(dev))
813 bcm_suspend_device(dev);
814
815 if (device_may_wakeup(dev) && bdev->irq > 0) {
816 error = enable_irq_wake(bdev->irq);
817 if (!error)
818 bt_dev_dbg(bdev, "BCM irq: enabled");
819 }
820
821unlock:
822 mutex_unlock(&bcm_device_lock);
823
824 return 0;
825}
826
827/* resume callback */
828static int bcm_resume(struct device *dev)
829{
830 struct bcm_device *bdev = dev_get_drvdata(dev);
831 int err = 0;
832
833 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
834
835 /*
836 * When used with a device instantiated as platform_device, bcm_resume
837 * can be called at any time as long as platform device is bound,
838 * so it should use bcm_device_lock to protect access to hci_uart
839 * and device_wake-up GPIO.
840 */
841 mutex_lock(&bcm_device_lock);
842
843 if (!bdev->hu)
844 goto unlock;
845
846 if (device_may_wakeup(dev) && bdev->irq > 0) {
847 disable_irq_wake(bdev->irq);
848 bt_dev_dbg(bdev, "BCM irq: disabled");
849 }
850
851 err = bcm_resume_device(dev);
852
853unlock:
854 mutex_unlock(&bcm_device_lock);
855
856 if (!err) {
857 pm_runtime_disable(dev);
858 pm_runtime_set_active(dev);
859 pm_runtime_enable(dev);
860 }
861
862 return 0;
863}
864#endif
865
866/* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
867static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
868 {
869 .ident = "Meegopad T08",
870 .matches = {
871 DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
872 "To be filled by OEM."),
873 DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
874 DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
875 },
876 },
877 { }
878};
879
880#ifdef CONFIG_ACPI
881static const struct acpi_gpio_params first_gpio = { 0, 0, false };
882static const struct acpi_gpio_params second_gpio = { 1, 0, false };
883static const struct acpi_gpio_params third_gpio = { 2, 0, false };
884
885static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
886 { "device-wakeup-gpios", &first_gpio, 1 },
887 { "shutdown-gpios", &second_gpio, 1 },
888 { "host-wakeup-gpios", &third_gpio, 1 },
889 { },
890};
891
892static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
893 { "host-wakeup-gpios", &first_gpio, 1 },
894 { "device-wakeup-gpios", &second_gpio, 1 },
895 { "shutdown-gpios", &third_gpio, 1 },
896 { },
897};
898
899static int bcm_resource(struct acpi_resource *ares, void *data)
900{
901 struct bcm_device *dev = data;
902 struct acpi_resource_extended_irq *irq;
903 struct acpi_resource_gpio *gpio;
904 struct acpi_resource_uart_serialbus *sb;
905
906 switch (ares->type) {
907 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
908 irq = &ares->data.extended_irq;
909 if (irq->polarity != ACPI_ACTIVE_LOW)
910 dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
911 dev->irq_active_low = true;
912 break;
913
914 case ACPI_RESOURCE_TYPE_GPIO:
915 gpio = &ares->data.gpio;
916 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
917 dev->gpio_int_idx = dev->gpio_count;
918 dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
919 }
920 dev->gpio_count++;
921 break;
922
923 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
924 sb = &ares->data.uart_serial_bus;
925 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
926 dev->init_speed = sb->default_baud_rate;
927 dev->oper_speed = 4000000;
928 }
929 break;
930
931 default:
932 break;
933 }
934
935 return 0;
936}
937
938static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
939{
940 if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
941 return -EIO;
942
943 return 0;
944}
945
946static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
947{
948 if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
949 NULL, NULL, NULL)))
950 return -EIO;
951
952 return 0;
953}
954
955static int bcm_apple_get_resources(struct bcm_device *dev)
956{
957 struct acpi_device *adev = ACPI_COMPANION(dev->dev);
958 const union acpi_object *obj;
959
960 if (!adev ||
961 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
962 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
963 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
964 return -ENODEV;
965
966 if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
967 obj->buffer.length == 8)
968 dev->init_speed = *(u64 *)obj->buffer.pointer;
969
970 dev->set_device_wakeup = bcm_apple_set_device_wakeup;
971 dev->set_shutdown = bcm_apple_set_shutdown;
972
973 return 0;
974}
975#else
976static inline int bcm_apple_get_resources(struct bcm_device *dev)
977{
978 return -EOPNOTSUPP;
979}
980#endif /* CONFIG_ACPI */
981
982static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
983{
984 gpiod_set_value_cansleep(dev->device_wakeup, awake);
985 return 0;
986}
987
988static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
989{
990 gpiod_set_value_cansleep(dev->shutdown, powered);
991 if (dev->reset)
992 /*
993 * The reset line is asserted on powerdown and deasserted
994 * on poweron so the inverse of powered is used. Notice
995 * that the GPIO line BT_RST_N needs to be specified as
996 * active low in the device tree or similar system
997 * description.
998 */
999 gpiod_set_value_cansleep(dev->reset, !powered);
1000 return 0;
1001}
1002
1003/* Try a bunch of names for TXCO */
1004static struct clk *bcm_get_txco(struct device *dev)
1005{
1006 struct clk *clk;
1007
1008 /* New explicit name */
1009 clk = devm_clk_get(dev, "txco");
1010 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
1011 return clk;
1012
1013 /* Deprecated name */
1014 clk = devm_clk_get(dev, "extclk");
1015 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
1016 return clk;
1017
1018 /* Original code used no name at all */
1019 return devm_clk_get(dev, NULL);
1020}
1021
1022static int bcm_get_resources(struct bcm_device *dev)
1023{
1024 const struct dmi_system_id *dmi_id;
1025 int err;
1026
1027 dev->name = dev_name(dev->dev);
1028
1029 if (x86_apple_machine && !bcm_apple_get_resources(dev))
1030 return 0;
1031
1032 dev->txco_clk = bcm_get_txco(dev->dev);
1033
1034 /* Handle deferred probing */
1035 if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER))
1036 return PTR_ERR(dev->txco_clk);
1037
1038 /* Ignore all other errors as before */
1039 if (IS_ERR(dev->txco_clk))
1040 dev->txco_clk = NULL;
1041
1042 dev->lpo_clk = devm_clk_get(dev->dev, "lpo");
1043 if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER))
1044 return PTR_ERR(dev->lpo_clk);
1045
1046 if (IS_ERR(dev->lpo_clk))
1047 dev->lpo_clk = NULL;
1048
1049 /* Check if we accidentally fetched the lpo clock twice */
1050 if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) {
1051 devm_clk_put(dev->dev, dev->txco_clk);
1052 dev->txco_clk = NULL;
1053 }
1054
1055 dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
1056 GPIOD_OUT_LOW);
1057 if (IS_ERR(dev->device_wakeup))
1058 return PTR_ERR(dev->device_wakeup);
1059
1060 dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
1061 GPIOD_OUT_LOW);
1062 if (IS_ERR(dev->shutdown))
1063 return PTR_ERR(dev->shutdown);
1064
1065 dev->reset = devm_gpiod_get_optional(dev->dev, "reset",
1066 GPIOD_OUT_LOW);
1067 if (IS_ERR(dev->reset))
1068 return PTR_ERR(dev->reset);
1069
1070 dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
1071 dev->set_shutdown = bcm_gpio_set_shutdown;
1072
1073 dev->supplies[0].supply = "vbat";
1074 dev->supplies[1].supply = "vddio";
1075 err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES,
1076 dev->supplies);
1077 if (err)
1078 return err;
1079
1080 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
1081 if (dev->irq <= 0) {
1082 struct gpio_desc *gpio;
1083
1084 gpio = devm_gpiod_get_optional(dev->dev, "host-wakeup",
1085 GPIOD_IN);
1086 if (IS_ERR(gpio))
1087 return PTR_ERR(gpio);
1088
1089 dev->irq = gpiod_to_irq(gpio);
1090 }
1091
1092 dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
1093 if (dmi_id) {
1094 dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n",
1095 dmi_id->ident);
1096 dev->irq = 0;
1097 }
1098
1099 dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
1100 return 0;
1101}
1102
1103#ifdef CONFIG_ACPI
1104static int bcm_acpi_probe(struct bcm_device *dev)
1105{
1106 LIST_HEAD(resources);
1107 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
1108 struct resource_entry *entry;
1109 int ret;
1110
1111 /* Retrieve UART ACPI info */
1112 dev->gpio_int_idx = -1;
1113 ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
1114 &resources, bcm_resource, dev);
1115 if (ret < 0)
1116 return ret;
1117
1118 resource_list_for_each_entry(entry, &resources) {
1119 if (resource_type(entry->res) == IORESOURCE_IRQ) {
1120 dev->irq = entry->res->start;
1121 break;
1122 }
1123 }
1124 acpi_dev_free_resource_list(&resources);
1125
1126 /* If the DSDT uses an Interrupt resource for the IRQ, then there are
1127 * only 2 GPIO resources, we use the irq-last mapping for this, since
1128 * we already have an irq the 3th / last mapping will not be used.
1129 */
1130 if (dev->irq)
1131 gpio_mapping = acpi_bcm_int_last_gpios;
1132 else if (dev->gpio_int_idx == 0)
1133 gpio_mapping = acpi_bcm_int_first_gpios;
1134 else if (dev->gpio_int_idx == 2)
1135 gpio_mapping = acpi_bcm_int_last_gpios;
1136 else
1137 dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n",
1138 dev->gpio_int_idx);
1139
1140 /* Warn if our expectations are not met. */
1141 if (dev->gpio_count != (dev->irq ? 2 : 3))
1142 dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n",
1143 dev->gpio_count);
1144
1145 ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
1146 if (ret)
1147 return ret;
1148
1149 if (irq_polarity != -1) {
1150 dev->irq_active_low = irq_polarity;
1151 dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n",
1152 dev->irq_active_low ? "low" : "high");
1153 }
1154
1155 return 0;
1156}
1157#else
1158static int bcm_acpi_probe(struct bcm_device *dev)
1159{
1160 return -EINVAL;
1161}
1162#endif /* CONFIG_ACPI */
1163
1164static int bcm_of_probe(struct bcm_device *bdev)
1165{
1166 device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
1167 device_property_read_u8_array(bdev->dev, "brcm,bt-pcm-int-params",
1168 bdev->pcm_int_params, 5);
1169 bdev->irq = of_irq_get_byname(bdev->dev->of_node, "host-wakeup");
1170 bdev->irq_active_low = irq_get_trigger_type(bdev->irq)
1171 & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW);
1172 return 0;
1173}
1174
1175static int bcm_probe(struct platform_device *pdev)
1176{
1177 struct bcm_device *dev;
1178 int ret;
1179
1180 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1181 if (!dev)
1182 return -ENOMEM;
1183
1184 dev->dev = &pdev->dev;
1185 dev->irq = platform_get_irq(pdev, 0);
1186
1187 /* Initialize routing field to an unused value */
1188 dev->pcm_int_params[0] = 0xff;
1189
1190 if (has_acpi_companion(&pdev->dev)) {
1191 ret = bcm_acpi_probe(dev);
1192 if (ret)
1193 return ret;
1194 }
1195
1196 ret = bcm_get_resources(dev);
1197 if (ret)
1198 return ret;
1199
1200 platform_set_drvdata(pdev, dev);
1201
1202 dev_info(&pdev->dev, "%s device registered.\n", dev->name);
1203
1204 /* Place this instance on the device list */
1205 mutex_lock(&bcm_device_lock);
1206 list_add_tail(&dev->list, &bcm_device_list);
1207 mutex_unlock(&bcm_device_lock);
1208
1209 ret = bcm_gpio_set_power(dev, false);
1210 if (ret)
1211 dev_err(&pdev->dev, "Failed to power down\n");
1212
1213 return 0;
1214}
1215
1216static int bcm_remove(struct platform_device *pdev)
1217{
1218 struct bcm_device *dev = platform_get_drvdata(pdev);
1219
1220 mutex_lock(&bcm_device_lock);
1221 list_del(&dev->list);
1222 mutex_unlock(&bcm_device_lock);
1223
1224 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
1225
1226 return 0;
1227}
1228
1229static const struct hci_uart_proto bcm_proto = {
1230 .id = HCI_UART_BCM,
1231 .name = "Broadcom",
1232 .manufacturer = 15,
1233 .init_speed = 115200,
1234 .open = bcm_open,
1235 .close = bcm_close,
1236 .flush = bcm_flush,
1237 .setup = bcm_setup,
1238 .set_baudrate = bcm_set_baudrate,
1239 .recv = bcm_recv,
1240 .enqueue = bcm_enqueue,
1241 .dequeue = bcm_dequeue,
1242};
1243
1244#ifdef CONFIG_ACPI
1245static const struct acpi_device_id bcm_acpi_match[] = {
1246 { "BCM2E00" },
1247 { "BCM2E01" },
1248 { "BCM2E02" },
1249 { "BCM2E03" },
1250 { "BCM2E04" },
1251 { "BCM2E05" },
1252 { "BCM2E06" },
1253 { "BCM2E07" },
1254 { "BCM2E08" },
1255 { "BCM2E09" },
1256 { "BCM2E0A" },
1257 { "BCM2E0B" },
1258 { "BCM2E0C" },
1259 { "BCM2E0D" },
1260 { "BCM2E0E" },
1261 { "BCM2E0F" },
1262 { "BCM2E10" },
1263 { "BCM2E11" },
1264 { "BCM2E12" },
1265 { "BCM2E13" },
1266 { "BCM2E14" },
1267 { "BCM2E15" },
1268 { "BCM2E16" },
1269 { "BCM2E17" },
1270 { "BCM2E18" },
1271 { "BCM2E19" },
1272 { "BCM2E1A" },
1273 { "BCM2E1B" },
1274 { "BCM2E1C" },
1275 { "BCM2E1D" },
1276 { "BCM2E1F" },
1277 { "BCM2E20" },
1278 { "BCM2E21" },
1279 { "BCM2E22" },
1280 { "BCM2E23" },
1281 { "BCM2E24" },
1282 { "BCM2E25" },
1283 { "BCM2E26" },
1284 { "BCM2E27" },
1285 { "BCM2E28" },
1286 { "BCM2E29" },
1287 { "BCM2E2A" },
1288 { "BCM2E2B" },
1289 { "BCM2E2C" },
1290 { "BCM2E2D" },
1291 { "BCM2E2E" },
1292 { "BCM2E2F" },
1293 { "BCM2E30" },
1294 { "BCM2E31" },
1295 { "BCM2E32" },
1296 { "BCM2E33" },
1297 { "BCM2E34" },
1298 { "BCM2E35" },
1299 { "BCM2E36" },
1300 { "BCM2E37" },
1301 { "BCM2E38" },
1302 { "BCM2E39" },
1303 { "BCM2E3A" },
1304 { "BCM2E3B" },
1305 { "BCM2E3C" },
1306 { "BCM2E3D" },
1307 { "BCM2E3E" },
1308 { "BCM2E3F" },
1309 { "BCM2E40" },
1310 { "BCM2E41" },
1311 { "BCM2E42" },
1312 { "BCM2E43" },
1313 { "BCM2E44" },
1314 { "BCM2E45" },
1315 { "BCM2E46" },
1316 { "BCM2E47" },
1317 { "BCM2E48" },
1318 { "BCM2E49" },
1319 { "BCM2E4A" },
1320 { "BCM2E4B" },
1321 { "BCM2E4C" },
1322 { "BCM2E4D" },
1323 { "BCM2E4E" },
1324 { "BCM2E4F" },
1325 { "BCM2E50" },
1326 { "BCM2E51" },
1327 { "BCM2E52" },
1328 { "BCM2E53" },
1329 { "BCM2E54" },
1330 { "BCM2E55" },
1331 { "BCM2E56" },
1332 { "BCM2E57" },
1333 { "BCM2E58" },
1334 { "BCM2E59" },
1335 { "BCM2E5A" },
1336 { "BCM2E5B" },
1337 { "BCM2E5C" },
1338 { "BCM2E5D" },
1339 { "BCM2E5E" },
1340 { "BCM2E5F" },
1341 { "BCM2E60" },
1342 { "BCM2E61" },
1343 { "BCM2E62" },
1344 { "BCM2E63" },
1345 { "BCM2E64" },
1346 { "BCM2E65" },
1347 { "BCM2E66" },
1348 { "BCM2E67" },
1349 { "BCM2E68" },
1350 { "BCM2E69" },
1351 { "BCM2E6B" },
1352 { "BCM2E6D" },
1353 { "BCM2E6E" },
1354 { "BCM2E6F" },
1355 { "BCM2E70" },
1356 { "BCM2E71" },
1357 { "BCM2E72" },
1358 { "BCM2E73" },
1359 { "BCM2E74" },
1360 { "BCM2E75" },
1361 { "BCM2E76" },
1362 { "BCM2E77" },
1363 { "BCM2E78" },
1364 { "BCM2E79" },
1365 { "BCM2E7A" },
1366 { "BCM2E7B" },
1367 { "BCM2E7C" },
1368 { "BCM2E7D" },
1369 { "BCM2E7E" },
1370 { "BCM2E7F" },
1371 { "BCM2E80" },
1372 { "BCM2E81" },
1373 { "BCM2E82" },
1374 { "BCM2E83" },
1375 { "BCM2E84" },
1376 { "BCM2E85" },
1377 { "BCM2E86" },
1378 { "BCM2E87" },
1379 { "BCM2E88" },
1380 { "BCM2E89" },
1381 { "BCM2E8A" },
1382 { "BCM2E8B" },
1383 { "BCM2E8C" },
1384 { "BCM2E8D" },
1385 { "BCM2E8E" },
1386 { "BCM2E90" },
1387 { "BCM2E92" },
1388 { "BCM2E93" },
1389 { "BCM2E94" },
1390 { "BCM2E95" },
1391 { "BCM2E96" },
1392 { "BCM2E97" },
1393 { "BCM2E98" },
1394 { "BCM2E99" },
1395 { "BCM2E9A" },
1396 { "BCM2E9B" },
1397 { "BCM2E9C" },
1398 { "BCM2E9D" },
1399 { "BCM2EA0" },
1400 { "BCM2EA1" },
1401 { "BCM2EA2" },
1402 { "BCM2EA3" },
1403 { "BCM2EA4" },
1404 { "BCM2EA5" },
1405 { "BCM2EA6" },
1406 { "BCM2EA7" },
1407 { "BCM2EA8" },
1408 { "BCM2EA9" },
1409 { "BCM2EAA" },
1410 { "BCM2EAB" },
1411 { "BCM2EAC" },
1412 { },
1413};
1414MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
1415#endif
1416
1417/* suspend and resume callbacks */
1418static const struct dev_pm_ops bcm_pm_ops = {
1419 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
1420 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
1421};
1422
1423static struct platform_driver bcm_driver = {
1424 .probe = bcm_probe,
1425 .remove = bcm_remove,
1426 .driver = {
1427 .name = "hci_bcm",
1428 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1429 .pm = &bcm_pm_ops,
1430 },
1431};
1432
1433static int bcm_serdev_probe(struct serdev_device *serdev)
1434{
1435 struct bcm_device *bcmdev;
1436 const struct bcm_device_data *data;
1437 int err;
1438
1439 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
1440 if (!bcmdev)
1441 return -ENOMEM;
1442
1443 bcmdev->dev = &serdev->dev;
1444#ifdef CONFIG_PM
1445 bcmdev->hu = &bcmdev->serdev_hu;
1446#endif
1447 bcmdev->serdev_hu.serdev = serdev;
1448 serdev_device_set_drvdata(serdev, bcmdev);
1449
1450 /* Initialize routing field to an unused value */
1451 bcmdev->pcm_int_params[0] = 0xff;
1452
1453 if (has_acpi_companion(&serdev->dev))
1454 err = bcm_acpi_probe(bcmdev);
1455 else
1456 err = bcm_of_probe(bcmdev);
1457 if (err)
1458 return err;
1459
1460 err = bcm_get_resources(bcmdev);
1461 if (err)
1462 return err;
1463
1464 if (!bcmdev->shutdown) {
1465 dev_warn(&serdev->dev,
1466 "No reset resource, using default baud rate\n");
1467 bcmdev->oper_speed = bcmdev->init_speed;
1468 }
1469
1470 err = bcm_gpio_set_power(bcmdev, false);
1471 if (err)
1472 dev_err(&serdev->dev, "Failed to power down\n");
1473
1474 data = device_get_match_data(bcmdev->dev);
1475 if (data) {
1476 bcmdev->no_early_set_baudrate = data->no_early_set_baudrate;
1477 bcmdev->drive_rts_on_open = data->drive_rts_on_open;
1478 }
1479
1480 return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
1481}
1482
1483static void bcm_serdev_remove(struct serdev_device *serdev)
1484{
1485 struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
1486
1487 hci_uart_unregister_device(&bcmdev->serdev_hu);
1488}
1489
1490#ifdef CONFIG_OF
1491static struct bcm_device_data bcm4354_device_data = {
1492 .no_early_set_baudrate = true,
1493};
1494
1495static struct bcm_device_data bcm43438_device_data = {
1496 .drive_rts_on_open = true,
1497};
1498
1499static const struct of_device_id bcm_bluetooth_of_match[] = {
1500 { .compatible = "brcm,bcm20702a1" },
1501 { .compatible = "brcm,bcm4329-bt" },
1502 { .compatible = "brcm,bcm4330-bt" },
1503 { .compatible = "brcm,bcm4334-bt" },
1504 { .compatible = "brcm,bcm4345c5" },
1505 { .compatible = "brcm,bcm4330-bt" },
1506 { .compatible = "brcm,bcm43438-bt", .data = &bcm43438_device_data },
1507 { .compatible = "brcm,bcm43540-bt", .data = &bcm4354_device_data },
1508 { .compatible = "brcm,bcm4335a0" },
1509 { },
1510};
1511MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
1512#endif
1513
1514static struct serdev_device_driver bcm_serdev_driver = {
1515 .probe = bcm_serdev_probe,
1516 .remove = bcm_serdev_remove,
1517 .driver = {
1518 .name = "hci_uart_bcm",
1519 .of_match_table = of_match_ptr(bcm_bluetooth_of_match),
1520 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1521 .pm = &bcm_pm_ops,
1522 },
1523};
1524
1525int __init bcm_init(void)
1526{
1527 /* For now, we need to keep both platform device
1528 * driver (ACPI generated) and serdev driver (DT).
1529 */
1530 platform_driver_register(&bcm_driver);
1531 serdev_device_driver_register(&bcm_serdev_driver);
1532
1533 return hci_uart_register_proto(&bcm_proto);
1534}
1535
1536int __exit bcm_deinit(void)
1537{
1538 platform_driver_unregister(&bcm_driver);
1539 serdev_device_driver_unregister(&bcm_serdev_driver);
1540
1541 return hci_uart_unregister_proto(&bcm_proto);
1542}