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 */
60 struct 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 */
112 struct 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 */
155 struct 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 */
163 static DEFINE_MUTEX(bcm_device_lock);
164 static LIST_HEAD(bcm_device_list);
165
166 static int irq_polarity = -1;
167 module_param(irq_polarity, int, 0444);
168 MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low");
169
host_set_baudrate(struct hci_uart * hu,unsigned int speed)170 static 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
bcm_set_baudrate(struct hci_uart * hu,unsigned int speed)178 static 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 */
bcm_device_exists(struct bcm_device * device)229 static 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
bcm_gpio_set_power(struct bcm_device * dev,bool powered)249 static 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
307 err_revert_shutdown:
308 dev->set_shutdown(dev, !powered);
309 err_txco_clk_disable:
310 if (powered && !dev->res_enabled)
311 clk_disable_unprepare(dev->txco_clk);
312 err_lpo_clk_disable:
313 if (powered && !dev->res_enabled)
314 clk_disable_unprepare(dev->lpo_clk);
315 err_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
bcm_host_wake(int irq,void * data)322 static 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_put_autosuspend(bdev->dev);
330
331 return IRQ_HANDLED;
332 }
333
bcm_request_irq(struct bcm_data * bcm)334 static int bcm_request_irq(struct bcm_data *bcm)
335 {
336 struct bcm_device *bdev = bcm->dev;
337 int err;
338
339 mutex_lock(&bcm_device_lock);
340 if (!bcm_device_exists(bdev)) {
341 err = -ENODEV;
342 goto unlock;
343 }
344
345 if (bdev->irq <= 0) {
346 err = -EOPNOTSUPP;
347 goto unlock;
348 }
349
350 err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake,
351 bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
352 IRQF_TRIGGER_RISING,
353 "host_wake", bdev);
354 if (err) {
355 bdev->irq = err;
356 goto unlock;
357 }
358
359 bdev->irq_acquired = true;
360
361 device_init_wakeup(bdev->dev, true);
362
363 pm_runtime_set_autosuspend_delay(bdev->dev,
364 BCM_AUTOSUSPEND_DELAY);
365 pm_runtime_use_autosuspend(bdev->dev);
366 pm_runtime_set_active(bdev->dev);
367 pm_runtime_enable(bdev->dev);
368
369 unlock:
370 mutex_unlock(&bcm_device_lock);
371
372 return err;
373 }
374
375 static const struct bcm_set_sleep_mode default_sleep_params = {
376 .sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
377 .idle_host = 2, /* idle threshold HOST, in 300ms */
378 .idle_dev = 2, /* idle threshold device, in 300ms */
379 .bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */
380 .host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */
381 .allow_host_sleep = 1, /* Allow host sleep in SCO flag */
382 .combine_modes = 1, /* Combine sleep and LPM flag */
383 .tristate_control = 0, /* Allow tri-state control of UART tx flag */
384 /* Irrelevant USB flags */
385 .usb_auto_sleep = 0,
386 .usb_resume_timeout = 0,
387 .break_to_host = 0,
388 .pulsed_host_wake = 1,
389 };
390
bcm_setup_sleep(struct hci_uart * hu)391 static int bcm_setup_sleep(struct hci_uart *hu)
392 {
393 struct bcm_data *bcm = hu->priv;
394 struct sk_buff *skb;
395 struct bcm_set_sleep_mode sleep_params = default_sleep_params;
396
397 sleep_params.host_wake_active = !bcm->dev->irq_active_low;
398
399 skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
400 &sleep_params, HCI_INIT_TIMEOUT);
401 if (IS_ERR(skb)) {
402 int err = PTR_ERR(skb);
403 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
404 return err;
405 }
406 kfree_skb(skb);
407
408 bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
409
410 return 0;
411 }
412 #else
bcm_request_irq(struct bcm_data * bcm)413 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
bcm_setup_sleep(struct hci_uart * hu)414 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
415 #endif
416
bcm_set_diag(struct hci_dev * hdev,bool enable)417 static int bcm_set_diag(struct hci_dev *hdev, bool enable)
418 {
419 struct hci_uart *hu = hci_get_drvdata(hdev);
420 struct bcm_data *bcm = hu->priv;
421 struct sk_buff *skb;
422
423 if (!test_bit(HCI_RUNNING, &hdev->flags))
424 return -ENETDOWN;
425
426 skb = bt_skb_alloc(3, GFP_KERNEL);
427 if (!skb)
428 return -ENOMEM;
429
430 skb_put_u8(skb, BCM_LM_DIAG_PKT);
431 skb_put_u8(skb, 0xf0);
432 skb_put_u8(skb, enable);
433
434 skb_queue_tail(&bcm->txq, skb);
435 hci_uart_tx_wakeup(hu);
436
437 return 0;
438 }
439
bcm_open(struct hci_uart * hu)440 static int bcm_open(struct hci_uart *hu)
441 {
442 struct bcm_data *bcm;
443 struct list_head *p;
444 int err;
445
446 bt_dev_dbg(hu->hdev, "hu %p", hu);
447
448 if (!hci_uart_has_flow_control(hu))
449 return -EOPNOTSUPP;
450
451 bcm = kzalloc_obj(*bcm);
452 if (!bcm)
453 return -ENOMEM;
454
455 skb_queue_head_init(&bcm->txq);
456
457 hu->priv = bcm;
458
459 mutex_lock(&bcm_device_lock);
460
461 if (hu->serdev) {
462 bcm->dev = serdev_device_get_drvdata(hu->serdev);
463 goto out;
464 }
465
466 if (!hu->tty->dev)
467 goto out;
468
469 list_for_each(p, &bcm_device_list) {
470 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
471
472 /* Retrieve saved bcm_device based on parent of the
473 * platform device (saved during device probe) and
474 * parent of tty device used by hci_uart
475 */
476 if (hu->tty->dev->parent == dev->dev->parent) {
477 bcm->dev = dev;
478 #ifdef CONFIG_PM
479 dev->hu = hu;
480 #endif
481 break;
482 }
483 }
484
485 out:
486 if (bcm->dev) {
487 if (bcm->dev->use_autobaud_mode)
488 hci_uart_set_flow_control(hu, false); /* Assert BT_UART_CTS_N */
489 else if (bcm->dev->drive_rts_on_open)
490 hci_uart_set_flow_control(hu, true);
491
492 if (bcm->dev->use_autobaud_mode && bcm->dev->max_autobaud_speed)
493 hu->init_speed = min(bcm->dev->oper_speed, bcm->dev->max_autobaud_speed);
494 else
495 hu->init_speed = bcm->dev->init_speed;
496
497 /* If oper_speed is set, ldisc/serdev will set the baudrate
498 * before calling setup()
499 */
500 if (!bcm->dev->no_early_set_baudrate && !bcm->dev->use_autobaud_mode)
501 hu->oper_speed = bcm->dev->oper_speed;
502
503 err = bcm_gpio_set_power(bcm->dev, true);
504
505 if (bcm->dev->drive_rts_on_open)
506 hci_uart_set_flow_control(hu, false);
507
508 if (err)
509 goto err_unset_hu;
510 }
511
512 mutex_unlock(&bcm_device_lock);
513 return 0;
514
515 err_unset_hu:
516 #ifdef CONFIG_PM
517 if (!hu->serdev)
518 bcm->dev->hu = NULL;
519 #endif
520 mutex_unlock(&bcm_device_lock);
521 hu->priv = NULL;
522 kfree(bcm);
523 return err;
524 }
525
bcm_close(struct hci_uart * hu)526 static int bcm_close(struct hci_uart *hu)
527 {
528 struct bcm_data *bcm = hu->priv;
529 struct bcm_device *bdev = NULL;
530 int err;
531
532 bt_dev_dbg(hu->hdev, "hu %p", hu);
533
534 /* Protect bcm->dev against removal of the device or driver */
535 mutex_lock(&bcm_device_lock);
536
537 if (hu->serdev) {
538 bdev = serdev_device_get_drvdata(hu->serdev);
539 } else if (bcm_device_exists(bcm->dev)) {
540 bdev = bcm->dev;
541 #ifdef CONFIG_PM
542 bdev->hu = NULL;
543 #endif
544 }
545
546 if (bdev) {
547 if (IS_ENABLED(CONFIG_PM) && bdev->irq_acquired) {
548 devm_free_irq(bdev->dev, bdev->irq, bdev);
549 device_init_wakeup(bdev->dev, false);
550 pm_runtime_dont_use_autosuspend(bdev->dev);
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
bcm_flush(struct hci_uart * hu)570 static 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
bcm_setup(struct hci_uart * hu)581 static 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 (hci_test_quirk(hu->hdev, HCI_QUIRK_INVALID_BDADDR))
647 hci_set_quirk(hu->hdev, HCI_QUIRK_USE_BDADDR_PROPERTY);
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
683 static 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
bcm_recv(struct hci_uart * hu,const void * data,int count)694 static 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, 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_put_autosuspend(bcm->dev->dev);
714 }
715 mutex_unlock(&bcm_device_lock);
716 }
717
718 return count;
719 }
720
bcm_enqueue(struct hci_uart * hu,struct sk_buff * skb)721 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
722 {
723 struct bcm_data *bcm = hu->priv;
724
725 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
726
727 /* Prepend skb with frame type */
728 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
729 skb_queue_tail(&bcm->txq, skb);
730
731 return 0;
732 }
733
bcm_dequeue(struct hci_uart * hu)734 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
735 {
736 struct bcm_data *bcm = hu->priv;
737 struct sk_buff *skb = NULL;
738 struct bcm_device *bdev = NULL;
739
740 mutex_lock(&bcm_device_lock);
741
742 if (bcm_device_exists(bcm->dev)) {
743 bdev = bcm->dev;
744 pm_runtime_get_sync(bdev->dev);
745 /* Shall be resumed here */
746 }
747
748 skb = skb_dequeue(&bcm->txq);
749
750 if (bdev)
751 pm_runtime_put_autosuspend(bdev->dev);
752
753 mutex_unlock(&bcm_device_lock);
754
755 return skb;
756 }
757
758 #ifdef CONFIG_PM
bcm_suspend_device(struct device * dev)759 static int bcm_suspend_device(struct device *dev)
760 {
761 struct bcm_device *bdev = dev_get_drvdata(dev);
762 int err;
763
764 bt_dev_dbg(bdev, "");
765
766 if (!bdev->is_suspended && bdev->hu) {
767 hci_uart_set_flow_control(bdev->hu, true);
768
769 /* Once this returns, driver suspends BT via GPIO */
770 bdev->is_suspended = true;
771 }
772
773 /* Suspend the device */
774 err = bdev->set_device_wakeup(bdev, false);
775 if (err) {
776 if (bdev->is_suspended && bdev->hu) {
777 bdev->is_suspended = false;
778 hci_uart_set_flow_control(bdev->hu, false);
779 }
780 return -EBUSY;
781 }
782
783 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
784 msleep(15);
785
786 return 0;
787 }
788
bcm_resume_device(struct device * dev)789 static int bcm_resume_device(struct device *dev)
790 {
791 struct bcm_device *bdev = dev_get_drvdata(dev);
792 int err;
793
794 bt_dev_dbg(bdev, "");
795
796 err = bdev->set_device_wakeup(bdev, true);
797 if (err) {
798 dev_err(dev, "Failed to power up\n");
799 return err;
800 }
801
802 bt_dev_dbg(bdev, "resume, delaying 15 ms");
803 msleep(15);
804
805 /* When this executes, the device has woken up already */
806 if (bdev->is_suspended && bdev->hu) {
807 bdev->is_suspended = false;
808
809 hci_uart_set_flow_control(bdev->hu, false);
810 }
811
812 return 0;
813 }
814 #endif
815
816 #ifdef CONFIG_PM_SLEEP
817 /* suspend callback */
bcm_suspend(struct device * dev)818 static int bcm_suspend(struct device *dev)
819 {
820 struct bcm_device *bdev = dev_get_drvdata(dev);
821 int error;
822
823 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
824
825 /*
826 * When used with a device instantiated as platform_device, bcm_suspend
827 * can be called at any time as long as the platform device is bound,
828 * so it should use bcm_device_lock to protect access to hci_uart
829 * and device_wake-up GPIO.
830 */
831 mutex_lock(&bcm_device_lock);
832
833 if (!bdev->hu)
834 goto unlock;
835
836 if (pm_runtime_active(dev))
837 bcm_suspend_device(dev);
838
839 if (device_may_wakeup(dev) && bdev->irq > 0) {
840 error = enable_irq_wake(bdev->irq);
841 if (!error)
842 bt_dev_dbg(bdev, "BCM irq: enabled");
843 }
844
845 unlock:
846 mutex_unlock(&bcm_device_lock);
847
848 return 0;
849 }
850
851 /* resume callback */
bcm_resume(struct device * dev)852 static int bcm_resume(struct device *dev)
853 {
854 struct bcm_device *bdev = dev_get_drvdata(dev);
855 int err = 0;
856
857 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
858
859 /*
860 * When used with a device instantiated as platform_device, bcm_resume
861 * can be called at any time as long as platform device is bound,
862 * so it should use bcm_device_lock to protect access to hci_uart
863 * and device_wake-up GPIO.
864 */
865 mutex_lock(&bcm_device_lock);
866
867 if (!bdev->hu)
868 goto unlock;
869
870 if (device_may_wakeup(dev) && bdev->irq > 0) {
871 disable_irq_wake(bdev->irq);
872 bt_dev_dbg(bdev, "BCM irq: disabled");
873 }
874
875 err = bcm_resume_device(dev);
876
877 unlock:
878 mutex_unlock(&bcm_device_lock);
879
880 if (!err) {
881 pm_runtime_disable(dev);
882 pm_runtime_set_active(dev);
883 pm_runtime_enable(dev);
884 }
885
886 return 0;
887 }
888 #endif
889
890 /* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
891 static struct gpiod_lookup_table irq_on_int33fc02_pin17_gpios = {
892 .dev_id = "serial0-0",
893 .table = {
894 GPIO_LOOKUP("INT33FC:02", 17, "host-wakeup-alt", GPIO_ACTIVE_HIGH),
895 { }
896 },
897 };
898
899 static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
900 {
901 .ident = "Acer Iconia One 7 B1-750",
902 .matches = {
903 DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
904 DMI_MATCH(DMI_PRODUCT_NAME, "VESPA2"),
905 },
906 .driver_data = &irq_on_int33fc02_pin17_gpios,
907 },
908 {
909 .ident = "Asus TF103C",
910 .matches = {
911 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
912 DMI_MATCH(DMI_PRODUCT_NAME, "TF103C"),
913 },
914 .driver_data = &irq_on_int33fc02_pin17_gpios,
915 },
916 {
917 .ident = "Lenovo Yoga Tablet 2 830F/L / 1050F/L",
918 .matches = {
919 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corp."),
920 DMI_MATCH(DMI_PRODUCT_NAME, "VALLEYVIEW C0 PLATFORM"),
921 DMI_MATCH(DMI_BOARD_NAME, "BYT-T FFD8"),
922 /* Partial match on beginning of BIOS version */
923 DMI_MATCH(DMI_BIOS_VERSION, "BLADE_21"),
924 },
925 .driver_data = &irq_on_int33fc02_pin17_gpios,
926 },
927 {
928 .ident = "Meegopad T08",
929 .matches = {
930 DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
931 "To be filled by OEM."),
932 DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
933 DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
934 },
935 },
936 { }
937 };
938
939 #ifdef CONFIG_ACPI
940 static const struct acpi_gpio_params first_gpio = { 0, 0, false };
941 static const struct acpi_gpio_params second_gpio = { 1, 0, false };
942 static const struct acpi_gpio_params third_gpio = { 2, 0, false };
943
944 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
945 { "device-wakeup-gpios", &first_gpio, 1 },
946 { "shutdown-gpios", &second_gpio, 1 },
947 { "host-wakeup-gpios", &third_gpio, 1 },
948 { },
949 };
950
951 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
952 { "host-wakeup-gpios", &first_gpio, 1 },
953 { "device-wakeup-gpios", &second_gpio, 1 },
954 { "shutdown-gpios", &third_gpio, 1 },
955 { },
956 };
957
bcm_resource(struct acpi_resource * ares,void * data)958 static int bcm_resource(struct acpi_resource *ares, void *data)
959 {
960 struct bcm_device *dev = data;
961 struct acpi_resource_extended_irq *irq;
962 struct acpi_resource_gpio *gpio;
963 struct acpi_resource_uart_serialbus *sb;
964
965 switch (ares->type) {
966 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
967 irq = &ares->data.extended_irq;
968 if (irq->polarity != ACPI_ACTIVE_LOW)
969 dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
970 dev->irq_active_low = true;
971 break;
972
973 case ACPI_RESOURCE_TYPE_GPIO:
974 gpio = &ares->data.gpio;
975 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
976 dev->gpio_int_idx = dev->gpio_count;
977 dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
978 }
979 dev->gpio_count++;
980 break;
981
982 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
983 sb = &ares->data.uart_serial_bus;
984 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
985 dev->init_speed = sb->default_baud_rate;
986 dev->oper_speed = 4000000;
987 }
988 break;
989
990 default:
991 break;
992 }
993
994 return 0;
995 }
996
bcm_apple_set_device_wakeup(struct bcm_device * dev,bool awake)997 static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
998 {
999 if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
1000 return -EIO;
1001
1002 return 0;
1003 }
1004
bcm_apple_set_shutdown(struct bcm_device * dev,bool powered)1005 static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
1006 {
1007 if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
1008 NULL, NULL, NULL)))
1009 return -EIO;
1010
1011 return 0;
1012 }
1013
bcm_apple_get_resources(struct bcm_device * dev)1014 static int bcm_apple_get_resources(struct bcm_device *dev)
1015 {
1016 struct acpi_device *adev = ACPI_COMPANION(dev->dev);
1017 const union acpi_object *obj;
1018
1019 if (!adev ||
1020 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
1021 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
1022 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
1023 return -ENODEV;
1024
1025 if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
1026 obj->buffer.length == 8)
1027 dev->init_speed = *(u64 *)obj->buffer.pointer;
1028
1029 dev->set_device_wakeup = bcm_apple_set_device_wakeup;
1030 dev->set_shutdown = bcm_apple_set_shutdown;
1031
1032 return 0;
1033 }
1034 #else
bcm_apple_get_resources(struct bcm_device * dev)1035 static inline int bcm_apple_get_resources(struct bcm_device *dev)
1036 {
1037 return -EOPNOTSUPP;
1038 }
1039 #endif /* CONFIG_ACPI */
1040
bcm_gpio_set_device_wakeup(struct bcm_device * dev,bool awake)1041 static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
1042 {
1043 gpiod_set_value_cansleep(dev->device_wakeup, awake);
1044 return 0;
1045 }
1046
bcm_gpio_set_shutdown(struct bcm_device * dev,bool powered)1047 static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
1048 {
1049 gpiod_set_value_cansleep(dev->shutdown, powered);
1050 if (dev->reset)
1051 /*
1052 * The reset line is asserted on powerdown and deasserted
1053 * on poweron so the inverse of powered is used. Notice
1054 * that the GPIO line BT_RST_N needs to be specified as
1055 * active low in the device tree or similar system
1056 * description.
1057 */
1058 gpiod_set_value_cansleep(dev->reset, !powered);
1059 return 0;
1060 }
1061
1062 /* Try a bunch of names for TXCO */
bcm_get_txco(struct device * dev)1063 static struct clk *bcm_get_txco(struct device *dev)
1064 {
1065 struct clk *clk;
1066
1067 /* New explicit name */
1068 clk = devm_clk_get_optional(dev, "txco");
1069 if (clk)
1070 return clk;
1071
1072 /* Deprecated name */
1073 clk = devm_clk_get_optional(dev, "extclk");
1074 if (clk)
1075 return clk;
1076
1077 /* Original code used no name at all */
1078 return devm_clk_get_optional(dev, NULL);
1079 }
1080
bcm_get_resources(struct bcm_device * dev)1081 static int bcm_get_resources(struct bcm_device *dev)
1082 {
1083 const struct dmi_system_id *broken_irq_dmi_id;
1084 const char *irq_con_id = "host-wakeup";
1085 int err;
1086
1087 dev->name = dev_name(dev->dev);
1088
1089 if (x86_apple_machine && !bcm_apple_get_resources(dev))
1090 return 0;
1091
1092 dev->txco_clk = bcm_get_txco(dev->dev);
1093 if (IS_ERR(dev->txco_clk))
1094 return PTR_ERR(dev->txco_clk);
1095
1096 dev->lpo_clk = devm_clk_get_optional(dev->dev, "lpo");
1097 if (IS_ERR(dev->lpo_clk))
1098 return PTR_ERR(dev->lpo_clk);
1099
1100 /* Check if we accidentally fetched the lpo clock twice */
1101 if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) {
1102 devm_clk_put(dev->dev, dev->txco_clk);
1103 dev->txco_clk = NULL;
1104 }
1105
1106 dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
1107 GPIOD_OUT_LOW);
1108 if (IS_ERR(dev->device_wakeup))
1109 return PTR_ERR(dev->device_wakeup);
1110
1111 dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
1112 GPIOD_OUT_LOW);
1113 if (IS_ERR(dev->shutdown))
1114 return PTR_ERR(dev->shutdown);
1115
1116 dev->reset = devm_gpiod_get_optional(dev->dev, "reset",
1117 GPIOD_OUT_LOW);
1118 if (IS_ERR(dev->reset))
1119 return PTR_ERR(dev->reset);
1120
1121 dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
1122 dev->set_shutdown = bcm_gpio_set_shutdown;
1123
1124 dev->supplies[0].supply = "vbat";
1125 dev->supplies[1].supply = "vddio";
1126 err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES,
1127 dev->supplies);
1128 if (err)
1129 return err;
1130
1131 broken_irq_dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
1132 if (broken_irq_dmi_id && broken_irq_dmi_id->driver_data) {
1133 gpiod_add_lookup_table(broken_irq_dmi_id->driver_data);
1134 irq_con_id = "host-wakeup-alt";
1135 dev->irq_active_low = false;
1136 dev->irq = 0;
1137 }
1138
1139 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
1140 if (dev->irq <= 0) {
1141 struct gpio_desc *gpio;
1142
1143 gpio = devm_gpiod_get_optional(dev->dev, irq_con_id, GPIOD_IN);
1144 if (IS_ERR(gpio))
1145 return PTR_ERR(gpio);
1146
1147 dev->irq = gpiod_to_irq(gpio);
1148 }
1149
1150 if (broken_irq_dmi_id) {
1151 if (broken_irq_dmi_id->driver_data) {
1152 gpiod_remove_lookup_table(broken_irq_dmi_id->driver_data);
1153 } else {
1154 dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n",
1155 broken_irq_dmi_id->ident);
1156 dev->irq = 0;
1157 }
1158 }
1159
1160 dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
1161 return 0;
1162 }
1163
1164 #ifdef CONFIG_ACPI
bcm_acpi_probe(struct bcm_device * dev)1165 static int bcm_acpi_probe(struct bcm_device *dev)
1166 {
1167 LIST_HEAD(resources);
1168 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
1169 struct resource_entry *entry;
1170 int ret;
1171
1172 /* Retrieve UART ACPI info */
1173 dev->gpio_int_idx = -1;
1174 ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
1175 &resources, bcm_resource, dev);
1176 if (ret < 0)
1177 return ret;
1178
1179 resource_list_for_each_entry(entry, &resources) {
1180 if (resource_type(entry->res) == IORESOURCE_IRQ) {
1181 dev->irq = entry->res->start;
1182 break;
1183 }
1184 }
1185 acpi_dev_free_resource_list(&resources);
1186
1187 /* If the DSDT uses an Interrupt resource for the IRQ, then there are
1188 * only 2 GPIO resources, we use the irq-last mapping for this, since
1189 * we already have an irq the 3th / last mapping will not be used.
1190 */
1191 if (dev->irq)
1192 gpio_mapping = acpi_bcm_int_last_gpios;
1193 else if (dev->gpio_int_idx == 0)
1194 gpio_mapping = acpi_bcm_int_first_gpios;
1195 else if (dev->gpio_int_idx == 2)
1196 gpio_mapping = acpi_bcm_int_last_gpios;
1197 else
1198 dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n",
1199 dev->gpio_int_idx);
1200
1201 /* Warn if our expectations are not met. */
1202 if (dev->gpio_count != (dev->irq ? 2 : 3))
1203 dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n",
1204 dev->gpio_count);
1205
1206 ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
1207 if (ret)
1208 return ret;
1209
1210 if (irq_polarity != -1) {
1211 dev->irq_active_low = irq_polarity;
1212 dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n",
1213 dev->irq_active_low ? "low" : "high");
1214 }
1215
1216 return 0;
1217 }
1218 #else
bcm_acpi_probe(struct bcm_device * dev)1219 static int bcm_acpi_probe(struct bcm_device *dev)
1220 {
1221 return -EINVAL;
1222 }
1223 #endif /* CONFIG_ACPI */
1224
bcm_of_probe(struct bcm_device * bdev)1225 static int bcm_of_probe(struct bcm_device *bdev)
1226 {
1227 bdev->use_autobaud_mode = device_property_read_bool(bdev->dev,
1228 "brcm,requires-autobaud-mode");
1229 device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
1230 device_property_read_u8_array(bdev->dev, "brcm,bt-pcm-int-params",
1231 bdev->pcm_int_params, 5);
1232 bdev->irq = of_irq_get_byname(bdev->dev->of_node, "host-wakeup");
1233 bdev->irq_active_low = irq_get_trigger_type(bdev->irq)
1234 & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW);
1235 return 0;
1236 }
1237
bcm_probe(struct platform_device * pdev)1238 static int bcm_probe(struct platform_device *pdev)
1239 {
1240 struct bcm_device *dev;
1241 int ret;
1242
1243 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1244 if (!dev)
1245 return -ENOMEM;
1246
1247 dev->dev = &pdev->dev;
1248
1249 ret = platform_get_irq(pdev, 0);
1250 if (ret < 0)
1251 return ret;
1252
1253 dev->irq = ret;
1254
1255 /* Initialize routing field to an unused value */
1256 dev->pcm_int_params[0] = 0xff;
1257
1258 if (has_acpi_companion(&pdev->dev)) {
1259 ret = bcm_acpi_probe(dev);
1260 if (ret)
1261 return ret;
1262 }
1263
1264 ret = bcm_get_resources(dev);
1265 if (ret)
1266 return ret;
1267
1268 platform_set_drvdata(pdev, dev);
1269
1270 dev_info(&pdev->dev, "%s device registered.\n", dev->name);
1271
1272 /* Place this instance on the device list */
1273 mutex_lock(&bcm_device_lock);
1274 list_add_tail(&dev->list, &bcm_device_list);
1275 mutex_unlock(&bcm_device_lock);
1276
1277 ret = bcm_gpio_set_power(dev, false);
1278 if (ret)
1279 dev_err(&pdev->dev, "Failed to power down\n");
1280
1281 return 0;
1282 }
1283
bcm_remove(struct platform_device * pdev)1284 static void bcm_remove(struct platform_device *pdev)
1285 {
1286 struct bcm_device *dev = platform_get_drvdata(pdev);
1287
1288 mutex_lock(&bcm_device_lock);
1289 list_del(&dev->list);
1290 mutex_unlock(&bcm_device_lock);
1291
1292 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
1293 }
1294
1295 static const struct hci_uart_proto bcm_proto = {
1296 .id = HCI_UART_BCM,
1297 .name = "Broadcom",
1298 .manufacturer = 15,
1299 .init_speed = 115200,
1300 .open = bcm_open,
1301 .close = bcm_close,
1302 .flush = bcm_flush,
1303 .setup = bcm_setup,
1304 .set_baudrate = bcm_set_baudrate,
1305 .recv = bcm_recv,
1306 .enqueue = bcm_enqueue,
1307 .dequeue = bcm_dequeue,
1308 };
1309
1310 #ifdef CONFIG_ACPI
1311
1312 /* bcm43430a0/a1 BT does not support 48MHz UART clock, limit to 2000000 baud */
1313 static struct bcm_device_data bcm43430_device_data = {
1314 .max_speed = 2000000,
1315 };
1316
1317 static const struct acpi_device_id bcm_acpi_match[] = {
1318 { .id = "BCM2E00" },
1319 { .id = "BCM2E01" },
1320 { .id = "BCM2E02" },
1321 { .id = "BCM2E03" },
1322 { .id = "BCM2E04" },
1323 { .id = "BCM2E05" },
1324 { .id = "BCM2E06" },
1325 { .id = "BCM2E07" },
1326 { .id = "BCM2E08" },
1327 { .id = "BCM2E09" },
1328 { .id = "BCM2E0A" },
1329 { .id = "BCM2E0B" },
1330 { .id = "BCM2E0C" },
1331 { .id = "BCM2E0D" },
1332 { .id = "BCM2E0E" },
1333 { .id = "BCM2E0F" },
1334 { .id = "BCM2E10" },
1335 { .id = "BCM2E11" },
1336 { .id = "BCM2E12" },
1337 { .id = "BCM2E13" },
1338 { .id = "BCM2E14" },
1339 { .id = "BCM2E15" },
1340 { .id = "BCM2E16" },
1341 { .id = "BCM2E17" },
1342 { .id = "BCM2E18" },
1343 { .id = "BCM2E19" },
1344 { .id = "BCM2E1A" },
1345 { .id = "BCM2E1B" },
1346 { .id = "BCM2E1C" },
1347 { .id = "BCM2E1D" },
1348 { .id = "BCM2E1F" },
1349 { .id = "BCM2E20" },
1350 { .id = "BCM2E21" },
1351 { .id = "BCM2E22" },
1352 { .id = "BCM2E23" },
1353 { .id = "BCM2E24" },
1354 { .id = "BCM2E25" },
1355 { .id = "BCM2E26" },
1356 { .id = "BCM2E27" },
1357 { .id = "BCM2E28" },
1358 { .id = "BCM2E29" },
1359 { .id = "BCM2E2A" },
1360 { .id = "BCM2E2B" },
1361 { .id = "BCM2E2C" },
1362 { .id = "BCM2E2D" },
1363 { .id = "BCM2E2E" },
1364 { .id = "BCM2E2F" },
1365 { .id = "BCM2E30" },
1366 { .id = "BCM2E31" },
1367 { .id = "BCM2E32" },
1368 { .id = "BCM2E33" },
1369 { .id = "BCM2E34" },
1370 { .id = "BCM2E35" },
1371 { .id = "BCM2E36" },
1372 { .id = "BCM2E37" },
1373 { .id = "BCM2E38" },
1374 { .id = "BCM2E39" },
1375 { .id = "BCM2E3A" },
1376 { .id = "BCM2E3B" },
1377 { .id = "BCM2E3C" },
1378 { .id = "BCM2E3D" },
1379 { .id = "BCM2E3E" },
1380 { .id = "BCM2E3F" },
1381 { .id = "BCM2E40" },
1382 { .id = "BCM2E41" },
1383 { .id = "BCM2E42" },
1384 { .id = "BCM2E43" },
1385 { .id = "BCM2E44" },
1386 { .id = "BCM2E45" },
1387 { .id = "BCM2E46" },
1388 { .id = "BCM2E47" },
1389 { .id = "BCM2E48" },
1390 { .id = "BCM2E49" },
1391 { .id = "BCM2E4A" },
1392 { .id = "BCM2E4B" },
1393 { .id = "BCM2E4C" },
1394 { .id = "BCM2E4D" },
1395 { .id = "BCM2E4E" },
1396 { .id = "BCM2E4F" },
1397 { .id = "BCM2E50" },
1398 { .id = "BCM2E51" },
1399 { .id = "BCM2E52" },
1400 { .id = "BCM2E53" },
1401 { .id = "BCM2E54" },
1402 { .id = "BCM2E55" },
1403 { .id = "BCM2E56" },
1404 { .id = "BCM2E57" },
1405 { .id = "BCM2E58" },
1406 { .id = "BCM2E59" },
1407 { .id = "BCM2E5A" },
1408 { .id = "BCM2E5B" },
1409 { .id = "BCM2E5C" },
1410 { .id = "BCM2E5D" },
1411 { .id = "BCM2E5E" },
1412 { .id = "BCM2E5F" },
1413 { .id = "BCM2E60" },
1414 { .id = "BCM2E61" },
1415 { .id = "BCM2E62" },
1416 { .id = "BCM2E63" },
1417 { .id = "BCM2E64" },
1418 { .id = "BCM2E65" },
1419 { .id = "BCM2E66" },
1420 { .id = "BCM2E67" },
1421 { .id = "BCM2E68" },
1422 { .id = "BCM2E69" },
1423 { .id = "BCM2E6B" },
1424 { .id = "BCM2E6D" },
1425 { .id = "BCM2E6E" },
1426 { .id = "BCM2E6F" },
1427 { .id = "BCM2E70" },
1428 { .id = "BCM2E71" },
1429 { .id = "BCM2E72" },
1430 { .id = "BCM2E73" },
1431 { .id = "BCM2E74", .driver_data = (long)&bcm43430_device_data },
1432 { .id = "BCM2E75", .driver_data = (long)&bcm43430_device_data },
1433 { .id = "BCM2E76" },
1434 { .id = "BCM2E77" },
1435 { .id = "BCM2E78" },
1436 { .id = "BCM2E79" },
1437 { .id = "BCM2E7A" },
1438 { .id = "BCM2E7B", .driver_data = (long)&bcm43430_device_data },
1439 { .id = "BCM2E7C" },
1440 { .id = "BCM2E7D" },
1441 { .id = "BCM2E7E" },
1442 { .id = "BCM2E7F" },
1443 { .id = "BCM2E80", .driver_data = (long)&bcm43430_device_data },
1444 { .id = "BCM2E81" },
1445 { .id = "BCM2E82" },
1446 { .id = "BCM2E83" },
1447 { .id = "BCM2E84" },
1448 { .id = "BCM2E85" },
1449 { .id = "BCM2E86" },
1450 { .id = "BCM2E87" },
1451 { .id = "BCM2E88" },
1452 { .id = "BCM2E89", .driver_data = (long)&bcm43430_device_data },
1453 { .id = "BCM2E8A" },
1454 { .id = "BCM2E8B" },
1455 { .id = "BCM2E8C" },
1456 { .id = "BCM2E8D" },
1457 { .id = "BCM2E8E" },
1458 { .id = "BCM2E90" },
1459 { .id = "BCM2E92" },
1460 { .id = "BCM2E93" },
1461 { .id = "BCM2E94", .driver_data = (long)&bcm43430_device_data },
1462 { .id = "BCM2E95" },
1463 { .id = "BCM2E96" },
1464 { .id = "BCM2E97" },
1465 { .id = "BCM2E98" },
1466 { .id = "BCM2E99", .driver_data = (long)&bcm43430_device_data },
1467 { .id = "BCM2E9A" },
1468 { .id = "BCM2E9B", .driver_data = (long)&bcm43430_device_data },
1469 { .id = "BCM2E9C" },
1470 { .id = "BCM2E9D" },
1471 { .id = "BCM2E9F", .driver_data = (long)&bcm43430_device_data },
1472 { .id = "BCM2EA0" },
1473 { .id = "BCM2EA1" },
1474 { .id = "BCM2EA2", .driver_data = (long)&bcm43430_device_data },
1475 { .id = "BCM2EA3", .driver_data = (long)&bcm43430_device_data },
1476 { .id = "BCM2EA4", .driver_data = (long)&bcm43430_device_data }, /* bcm43455 */
1477 { .id = "BCM2EA5" },
1478 { .id = "BCM2EA6" },
1479 { .id = "BCM2EA7" },
1480 { .id = "BCM2EA8" },
1481 { .id = "BCM2EA9" },
1482 { .id = "BCM2EAA", .driver_data = (long)&bcm43430_device_data },
1483 { .id = "BCM2EAB", .driver_data = (long)&bcm43430_device_data },
1484 { .id = "BCM2EAC", .driver_data = (long)&bcm43430_device_data },
1485 { }
1486 };
1487 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
1488 #endif
1489
1490 /* suspend and resume callbacks */
1491 static const struct dev_pm_ops bcm_pm_ops = {
1492 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
1493 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
1494 };
1495
1496 static struct platform_driver bcm_driver = {
1497 .probe = bcm_probe,
1498 .remove = bcm_remove,
1499 .driver = {
1500 .name = "hci_bcm",
1501 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1502 .pm = &bcm_pm_ops,
1503 },
1504 };
1505
bcm_serdev_probe(struct serdev_device * serdev)1506 static int bcm_serdev_probe(struct serdev_device *serdev)
1507 {
1508 struct bcm_device *bcmdev;
1509 const struct bcm_device_data *data;
1510 int err;
1511
1512 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
1513 if (!bcmdev)
1514 return -ENOMEM;
1515
1516 bcmdev->dev = &serdev->dev;
1517 #ifdef CONFIG_PM
1518 bcmdev->hu = &bcmdev->serdev_hu;
1519 #endif
1520 bcmdev->serdev_hu.serdev = serdev;
1521 serdev_device_set_drvdata(serdev, bcmdev);
1522
1523 /* Initialize routing field to an unused value */
1524 bcmdev->pcm_int_params[0] = 0xff;
1525
1526 if (has_acpi_companion(&serdev->dev))
1527 err = bcm_acpi_probe(bcmdev);
1528 else
1529 err = bcm_of_probe(bcmdev);
1530 if (err)
1531 return err;
1532
1533 err = bcm_get_resources(bcmdev);
1534 if (err)
1535 return err;
1536
1537 if (!bcmdev->shutdown) {
1538 dev_warn(&serdev->dev,
1539 "No reset resource, using default baud rate\n");
1540 bcmdev->oper_speed = bcmdev->init_speed;
1541 }
1542
1543 err = bcm_gpio_set_power(bcmdev, false);
1544 if (err)
1545 dev_err(&serdev->dev, "Failed to power down\n");
1546
1547 data = device_get_match_data(bcmdev->dev);
1548 if (data) {
1549 bcmdev->max_autobaud_speed = data->max_autobaud_speed;
1550 bcmdev->no_early_set_baudrate = data->no_early_set_baudrate;
1551 bcmdev->drive_rts_on_open = data->drive_rts_on_open;
1552 bcmdev->no_uart_clock_set = data->no_uart_clock_set;
1553 if (data->max_speed && bcmdev->oper_speed > data->max_speed)
1554 bcmdev->oper_speed = data->max_speed;
1555 }
1556
1557 return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
1558 }
1559
bcm_serdev_remove(struct serdev_device * serdev)1560 static void bcm_serdev_remove(struct serdev_device *serdev)
1561 {
1562 struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
1563
1564 hci_uart_unregister_device(&bcmdev->serdev_hu);
1565 }
1566
1567 #ifdef CONFIG_OF
1568 static struct bcm_device_data bcm4354_device_data = {
1569 .no_early_set_baudrate = true,
1570 };
1571
1572 static struct bcm_device_data bcm43438_device_data = {
1573 .drive_rts_on_open = true,
1574 };
1575
1576 static struct bcm_device_data cyw4373a0_device_data = {
1577 .no_uart_clock_set = true,
1578 };
1579
1580 static struct bcm_device_data cyw55572_device_data = {
1581 .max_autobaud_speed = 921600,
1582 };
1583
1584 static const struct of_device_id bcm_bluetooth_of_match[] = {
1585 { .compatible = "brcm,bcm20702a1" },
1586 { .compatible = "brcm,bcm4329-bt" },
1587 { .compatible = "brcm,bcm4330-bt" },
1588 { .compatible = "brcm,bcm4334-bt" },
1589 { .compatible = "brcm,bcm4345c5" },
1590 { .compatible = "brcm,bcm43430a0-bt" },
1591 { .compatible = "brcm,bcm43430a1-bt" },
1592 { .compatible = "brcm,bcm43438-bt", .data = &bcm43438_device_data },
1593 { .compatible = "brcm,bcm4349-bt", .data = &bcm43438_device_data },
1594 { .compatible = "brcm,bcm43540-bt", .data = &bcm4354_device_data },
1595 { .compatible = "brcm,bcm4335a0" },
1596 { .compatible = "cypress,cyw4373a0-bt", .data = &cyw4373a0_device_data },
1597 { .compatible = "infineon,cyw55572-bt", .data = &cyw55572_device_data },
1598 { },
1599 };
1600 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
1601 #endif
1602
1603 static struct serdev_device_driver bcm_serdev_driver = {
1604 .probe = bcm_serdev_probe,
1605 .remove = bcm_serdev_remove,
1606 .driver = {
1607 .name = "hci_uart_bcm",
1608 .of_match_table = of_match_ptr(bcm_bluetooth_of_match),
1609 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1610 .pm = &bcm_pm_ops,
1611 },
1612 };
1613
bcm_init(void)1614 int __init bcm_init(void)
1615 {
1616 /* For now, we need to keep both platform device
1617 * driver (ACPI generated) and serdev driver (DT).
1618 */
1619 platform_driver_register(&bcm_driver);
1620 serdev_device_driver_register(&bcm_serdev_driver);
1621
1622 return hci_uart_register_proto(&bcm_proto);
1623 }
1624
bcm_deinit(void)1625 int __exit bcm_deinit(void)
1626 {
1627 platform_driver_unregister(&bcm_driver);
1628 serdev_device_driver_unregister(&bcm_serdev_driver);
1629
1630 return hci_uart_unregister_proto(&bcm_proto);
1631 }
1632