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(sizeof(*bcm), GFP_KERNEL);
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_disable(bdev->dev);
551 }
552
553 err = bcm_gpio_set_power(bdev, false);
554 if (err)
555 bt_dev_err(hu->hdev, "Failed to power down");
556 else
557 pm_runtime_set_suspended(bdev->dev);
558 }
559 mutex_unlock(&bcm_device_lock);
560
561 skb_queue_purge(&bcm->txq);
562 kfree_skb(bcm->rx_skb);
563 kfree(bcm);
564
565 hu->priv = NULL;
566 return 0;
567 }
568
bcm_flush(struct hci_uart * hu)569 static int bcm_flush(struct hci_uart *hu)
570 {
571 struct bcm_data *bcm = hu->priv;
572
573 bt_dev_dbg(hu->hdev, "hu %p", hu);
574
575 skb_queue_purge(&bcm->txq);
576
577 return 0;
578 }
579
bcm_setup(struct hci_uart * hu)580 static int bcm_setup(struct hci_uart *hu)
581 {
582 struct bcm_data *bcm = hu->priv;
583 bool fw_load_done = false;
584 bool use_autobaud_mode = (bcm->dev ? bcm->dev->use_autobaud_mode : 0);
585 unsigned int speed;
586 int err;
587
588 bt_dev_dbg(hu->hdev, "hu %p", hu);
589
590 hu->hdev->set_diag = bcm_set_diag;
591 hu->hdev->set_bdaddr = btbcm_set_bdaddr;
592
593 err = btbcm_initialize(hu->hdev, &fw_load_done, use_autobaud_mode);
594 if (err)
595 return err;
596
597 if (!fw_load_done)
598 return 0;
599
600 /* Init speed if any */
601 if (bcm->dev && bcm->dev->init_speed)
602 speed = bcm->dev->init_speed;
603 else if (hu->proto->init_speed)
604 speed = hu->proto->init_speed;
605 else
606 speed = 0;
607
608 if (speed)
609 host_set_baudrate(hu, speed);
610
611 /* Operational speed if any */
612 if (hu->oper_speed)
613 speed = hu->oper_speed;
614 else if (bcm->dev && bcm->dev->oper_speed)
615 speed = bcm->dev->oper_speed;
616 else if (hu->proto->oper_speed)
617 speed = hu->proto->oper_speed;
618 else
619 speed = 0;
620
621 if (speed) {
622 err = bcm_set_baudrate(hu, speed);
623 if (!err)
624 host_set_baudrate(hu, speed);
625 }
626
627 /* PCM parameters if provided */
628 if (bcm->dev && bcm->dev->pcm_int_params[0] != 0xff) {
629 struct bcm_set_pcm_int_params params;
630
631 btbcm_read_pcm_int_params(hu->hdev, ¶ms);
632
633 memcpy(¶ms, bcm->dev->pcm_int_params, 5);
634 btbcm_write_pcm_int_params(hu->hdev, ¶ms);
635 }
636
637 err = btbcm_finalize(hu->hdev, &fw_load_done, use_autobaud_mode);
638 if (err)
639 return err;
640
641 /* Some devices ship with the controller default address.
642 * Allow the bootloader to set a valid address through the
643 * device tree.
644 */
645 if (hci_test_quirk(hu->hdev, HCI_QUIRK_INVALID_BDADDR))
646 hci_set_quirk(hu->hdev, HCI_QUIRK_USE_BDADDR_PROPERTY);
647
648 if (!bcm_request_irq(bcm))
649 err = bcm_setup_sleep(hu);
650
651 return err;
652 }
653
654 #define BCM_RECV_LM_DIAG \
655 .type = BCM_LM_DIAG_PKT, \
656 .hlen = BCM_LM_DIAG_SIZE, \
657 .loff = 0, \
658 .lsize = 0, \
659 .maxlen = BCM_LM_DIAG_SIZE
660
661 #define BCM_RECV_NULL \
662 .type = BCM_NULL_PKT, \
663 .hlen = BCM_NULL_SIZE, \
664 .loff = 0, \
665 .lsize = 0, \
666 .maxlen = BCM_NULL_SIZE
667
668 #define BCM_RECV_TYPE49 \
669 .type = BCM_TYPE49_PKT, \
670 .hlen = BCM_TYPE49_SIZE, \
671 .loff = 0, \
672 .lsize = 0, \
673 .maxlen = BCM_TYPE49_SIZE
674
675 #define BCM_RECV_TYPE52 \
676 .type = BCM_TYPE52_PKT, \
677 .hlen = BCM_TYPE52_SIZE, \
678 .loff = 0, \
679 .lsize = 0, \
680 .maxlen = BCM_TYPE52_SIZE
681
682 static const struct h4_recv_pkt bcm_recv_pkts[] = {
683 { H4_RECV_ACL, .recv = hci_recv_frame },
684 { H4_RECV_SCO, .recv = hci_recv_frame },
685 { H4_RECV_EVENT, .recv = hci_recv_frame },
686 { H4_RECV_ISO, .recv = hci_recv_frame },
687 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag },
688 { BCM_RECV_NULL, .recv = hci_recv_diag },
689 { BCM_RECV_TYPE49, .recv = hci_recv_diag },
690 { BCM_RECV_TYPE52, .recv = hci_recv_diag },
691 };
692
bcm_recv(struct hci_uart * hu,const void * data,int count)693 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
694 {
695 struct bcm_data *bcm = hu->priv;
696
697 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
698 return -EUNATCH;
699
700 bcm->rx_skb = h4_recv_buf(hu, bcm->rx_skb, data, count,
701 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
702 if (IS_ERR(bcm->rx_skb)) {
703 int err = PTR_ERR(bcm->rx_skb);
704 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
705 bcm->rx_skb = NULL;
706 return err;
707 } else if (!bcm->rx_skb) {
708 /* Delay auto-suspend when receiving completed packet */
709 mutex_lock(&bcm_device_lock);
710 if (bcm->dev && bcm_device_exists(bcm->dev)) {
711 pm_runtime_get(bcm->dev->dev);
712 pm_runtime_put_autosuspend(bcm->dev->dev);
713 }
714 mutex_unlock(&bcm_device_lock);
715 }
716
717 return count;
718 }
719
bcm_enqueue(struct hci_uart * hu,struct sk_buff * skb)720 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
721 {
722 struct bcm_data *bcm = hu->priv;
723
724 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
725
726 /* Prepend skb with frame type */
727 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
728 skb_queue_tail(&bcm->txq, skb);
729
730 return 0;
731 }
732
bcm_dequeue(struct hci_uart * hu)733 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
734 {
735 struct bcm_data *bcm = hu->priv;
736 struct sk_buff *skb = NULL;
737 struct bcm_device *bdev = NULL;
738
739 mutex_lock(&bcm_device_lock);
740
741 if (bcm_device_exists(bcm->dev)) {
742 bdev = bcm->dev;
743 pm_runtime_get_sync(bdev->dev);
744 /* Shall be resumed here */
745 }
746
747 skb = skb_dequeue(&bcm->txq);
748
749 if (bdev)
750 pm_runtime_put_autosuspend(bdev->dev);
751
752 mutex_unlock(&bcm_device_lock);
753
754 return skb;
755 }
756
757 #ifdef CONFIG_PM
bcm_suspend_device(struct device * dev)758 static int bcm_suspend_device(struct device *dev)
759 {
760 struct bcm_device *bdev = dev_get_drvdata(dev);
761 int err;
762
763 bt_dev_dbg(bdev, "");
764
765 if (!bdev->is_suspended && bdev->hu) {
766 hci_uart_set_flow_control(bdev->hu, true);
767
768 /* Once this returns, driver suspends BT via GPIO */
769 bdev->is_suspended = true;
770 }
771
772 /* Suspend the device */
773 err = bdev->set_device_wakeup(bdev, false);
774 if (err) {
775 if (bdev->is_suspended && bdev->hu) {
776 bdev->is_suspended = false;
777 hci_uart_set_flow_control(bdev->hu, false);
778 }
779 return -EBUSY;
780 }
781
782 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
783 msleep(15);
784
785 return 0;
786 }
787
bcm_resume_device(struct device * dev)788 static int bcm_resume_device(struct device *dev)
789 {
790 struct bcm_device *bdev = dev_get_drvdata(dev);
791 int err;
792
793 bt_dev_dbg(bdev, "");
794
795 err = bdev->set_device_wakeup(bdev, true);
796 if (err) {
797 dev_err(dev, "Failed to power up\n");
798 return err;
799 }
800
801 bt_dev_dbg(bdev, "resume, delaying 15 ms");
802 msleep(15);
803
804 /* When this executes, the device has woken up already */
805 if (bdev->is_suspended && bdev->hu) {
806 bdev->is_suspended = false;
807
808 hci_uart_set_flow_control(bdev->hu, false);
809 }
810
811 return 0;
812 }
813 #endif
814
815 #ifdef CONFIG_PM_SLEEP
816 /* suspend callback */
bcm_suspend(struct device * dev)817 static int bcm_suspend(struct device *dev)
818 {
819 struct bcm_device *bdev = dev_get_drvdata(dev);
820 int error;
821
822 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
823
824 /*
825 * When used with a device instantiated as platform_device, bcm_suspend
826 * can be called at any time as long as the platform device is bound,
827 * so it should use bcm_device_lock to protect access to hci_uart
828 * and device_wake-up GPIO.
829 */
830 mutex_lock(&bcm_device_lock);
831
832 if (!bdev->hu)
833 goto unlock;
834
835 if (pm_runtime_active(dev))
836 bcm_suspend_device(dev);
837
838 if (device_may_wakeup(dev) && bdev->irq > 0) {
839 error = enable_irq_wake(bdev->irq);
840 if (!error)
841 bt_dev_dbg(bdev, "BCM irq: enabled");
842 }
843
844 unlock:
845 mutex_unlock(&bcm_device_lock);
846
847 return 0;
848 }
849
850 /* resume callback */
bcm_resume(struct device * dev)851 static int bcm_resume(struct device *dev)
852 {
853 struct bcm_device *bdev = dev_get_drvdata(dev);
854 int err = 0;
855
856 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
857
858 /*
859 * When used with a device instantiated as platform_device, bcm_resume
860 * can be called at any time as long as platform device is bound,
861 * so it should use bcm_device_lock to protect access to hci_uart
862 * and device_wake-up GPIO.
863 */
864 mutex_lock(&bcm_device_lock);
865
866 if (!bdev->hu)
867 goto unlock;
868
869 if (device_may_wakeup(dev) && bdev->irq > 0) {
870 disable_irq_wake(bdev->irq);
871 bt_dev_dbg(bdev, "BCM irq: disabled");
872 }
873
874 err = bcm_resume_device(dev);
875
876 unlock:
877 mutex_unlock(&bcm_device_lock);
878
879 if (!err) {
880 pm_runtime_disable(dev);
881 pm_runtime_set_active(dev);
882 pm_runtime_enable(dev);
883 }
884
885 return 0;
886 }
887 #endif
888
889 /* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
890 static struct gpiod_lookup_table irq_on_int33fc02_pin17_gpios = {
891 .dev_id = "serial0-0",
892 .table = {
893 GPIO_LOOKUP("INT33FC:02", 17, "host-wakeup-alt", GPIO_ACTIVE_HIGH),
894 { }
895 },
896 };
897
898 static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
899 {
900 .ident = "Acer Iconia One 7 B1-750",
901 .matches = {
902 DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
903 DMI_MATCH(DMI_PRODUCT_NAME, "VESPA2"),
904 },
905 .driver_data = &irq_on_int33fc02_pin17_gpios,
906 },
907 {
908 .ident = "Asus TF103C",
909 .matches = {
910 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
911 DMI_MATCH(DMI_PRODUCT_NAME, "TF103C"),
912 },
913 .driver_data = &irq_on_int33fc02_pin17_gpios,
914 },
915 {
916 .ident = "Lenovo Yoga Tablet 2 830F/L / 1050F/L",
917 .matches = {
918 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corp."),
919 DMI_MATCH(DMI_PRODUCT_NAME, "VALLEYVIEW C0 PLATFORM"),
920 DMI_MATCH(DMI_BOARD_NAME, "BYT-T FFD8"),
921 /* Partial match on beginning of BIOS version */
922 DMI_MATCH(DMI_BIOS_VERSION, "BLADE_21"),
923 },
924 .driver_data = &irq_on_int33fc02_pin17_gpios,
925 },
926 {
927 .ident = "Meegopad T08",
928 .matches = {
929 DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
930 "To be filled by OEM."),
931 DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
932 DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
933 },
934 },
935 { }
936 };
937
938 #ifdef CONFIG_ACPI
939 static const struct acpi_gpio_params first_gpio = { 0, 0, false };
940 static const struct acpi_gpio_params second_gpio = { 1, 0, false };
941 static const struct acpi_gpio_params third_gpio = { 2, 0, false };
942
943 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
944 { "device-wakeup-gpios", &first_gpio, 1 },
945 { "shutdown-gpios", &second_gpio, 1 },
946 { "host-wakeup-gpios", &third_gpio, 1 },
947 { },
948 };
949
950 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
951 { "host-wakeup-gpios", &first_gpio, 1 },
952 { "device-wakeup-gpios", &second_gpio, 1 },
953 { "shutdown-gpios", &third_gpio, 1 },
954 { },
955 };
956
bcm_resource(struct acpi_resource * ares,void * data)957 static int bcm_resource(struct acpi_resource *ares, void *data)
958 {
959 struct bcm_device *dev = data;
960 struct acpi_resource_extended_irq *irq;
961 struct acpi_resource_gpio *gpio;
962 struct acpi_resource_uart_serialbus *sb;
963
964 switch (ares->type) {
965 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
966 irq = &ares->data.extended_irq;
967 if (irq->polarity != ACPI_ACTIVE_LOW)
968 dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
969 dev->irq_active_low = true;
970 break;
971
972 case ACPI_RESOURCE_TYPE_GPIO:
973 gpio = &ares->data.gpio;
974 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
975 dev->gpio_int_idx = dev->gpio_count;
976 dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
977 }
978 dev->gpio_count++;
979 break;
980
981 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
982 sb = &ares->data.uart_serial_bus;
983 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
984 dev->init_speed = sb->default_baud_rate;
985 dev->oper_speed = 4000000;
986 }
987 break;
988
989 default:
990 break;
991 }
992
993 return 0;
994 }
995
bcm_apple_set_device_wakeup(struct bcm_device * dev,bool awake)996 static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
997 {
998 if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
999 return -EIO;
1000
1001 return 0;
1002 }
1003
bcm_apple_set_shutdown(struct bcm_device * dev,bool powered)1004 static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
1005 {
1006 if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
1007 NULL, NULL, NULL)))
1008 return -EIO;
1009
1010 return 0;
1011 }
1012
bcm_apple_get_resources(struct bcm_device * dev)1013 static int bcm_apple_get_resources(struct bcm_device *dev)
1014 {
1015 struct acpi_device *adev = ACPI_COMPANION(dev->dev);
1016 const union acpi_object *obj;
1017
1018 if (!adev ||
1019 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
1020 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
1021 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
1022 return -ENODEV;
1023
1024 if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
1025 obj->buffer.length == 8)
1026 dev->init_speed = *(u64 *)obj->buffer.pointer;
1027
1028 dev->set_device_wakeup = bcm_apple_set_device_wakeup;
1029 dev->set_shutdown = bcm_apple_set_shutdown;
1030
1031 return 0;
1032 }
1033 #else
bcm_apple_get_resources(struct bcm_device * dev)1034 static inline int bcm_apple_get_resources(struct bcm_device *dev)
1035 {
1036 return -EOPNOTSUPP;
1037 }
1038 #endif /* CONFIG_ACPI */
1039
bcm_gpio_set_device_wakeup(struct bcm_device * dev,bool awake)1040 static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
1041 {
1042 gpiod_set_value_cansleep(dev->device_wakeup, awake);
1043 return 0;
1044 }
1045
bcm_gpio_set_shutdown(struct bcm_device * dev,bool powered)1046 static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
1047 {
1048 gpiod_set_value_cansleep(dev->shutdown, powered);
1049 if (dev->reset)
1050 /*
1051 * The reset line is asserted on powerdown and deasserted
1052 * on poweron so the inverse of powered is used. Notice
1053 * that the GPIO line BT_RST_N needs to be specified as
1054 * active low in the device tree or similar system
1055 * description.
1056 */
1057 gpiod_set_value_cansleep(dev->reset, !powered);
1058 return 0;
1059 }
1060
1061 /* Try a bunch of names for TXCO */
bcm_get_txco(struct device * dev)1062 static struct clk *bcm_get_txco(struct device *dev)
1063 {
1064 struct clk *clk;
1065
1066 /* New explicit name */
1067 clk = devm_clk_get_optional(dev, "txco");
1068 if (clk)
1069 return clk;
1070
1071 /* Deprecated name */
1072 clk = devm_clk_get_optional(dev, "extclk");
1073 if (clk)
1074 return clk;
1075
1076 /* Original code used no name at all */
1077 return devm_clk_get_optional(dev, NULL);
1078 }
1079
bcm_get_resources(struct bcm_device * dev)1080 static int bcm_get_resources(struct bcm_device *dev)
1081 {
1082 const struct dmi_system_id *broken_irq_dmi_id;
1083 const char *irq_con_id = "host-wakeup";
1084 int err;
1085
1086 dev->name = dev_name(dev->dev);
1087
1088 if (x86_apple_machine && !bcm_apple_get_resources(dev))
1089 return 0;
1090
1091 dev->txco_clk = bcm_get_txco(dev->dev);
1092 if (IS_ERR(dev->txco_clk))
1093 return PTR_ERR(dev->txco_clk);
1094
1095 dev->lpo_clk = devm_clk_get_optional(dev->dev, "lpo");
1096 if (IS_ERR(dev->lpo_clk))
1097 return PTR_ERR(dev->lpo_clk);
1098
1099 /* Check if we accidentally fetched the lpo clock twice */
1100 if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) {
1101 devm_clk_put(dev->dev, dev->txco_clk);
1102 dev->txco_clk = NULL;
1103 }
1104
1105 dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
1106 GPIOD_OUT_LOW);
1107 if (IS_ERR(dev->device_wakeup))
1108 return PTR_ERR(dev->device_wakeup);
1109
1110 dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
1111 GPIOD_OUT_LOW);
1112 if (IS_ERR(dev->shutdown))
1113 return PTR_ERR(dev->shutdown);
1114
1115 dev->reset = devm_gpiod_get_optional(dev->dev, "reset",
1116 GPIOD_OUT_LOW);
1117 if (IS_ERR(dev->reset))
1118 return PTR_ERR(dev->reset);
1119
1120 dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
1121 dev->set_shutdown = bcm_gpio_set_shutdown;
1122
1123 dev->supplies[0].supply = "vbat";
1124 dev->supplies[1].supply = "vddio";
1125 err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES,
1126 dev->supplies);
1127 if (err)
1128 return err;
1129
1130 broken_irq_dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
1131 if (broken_irq_dmi_id && broken_irq_dmi_id->driver_data) {
1132 gpiod_add_lookup_table(broken_irq_dmi_id->driver_data);
1133 irq_con_id = "host-wakeup-alt";
1134 dev->irq_active_low = false;
1135 dev->irq = 0;
1136 }
1137
1138 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
1139 if (dev->irq <= 0) {
1140 struct gpio_desc *gpio;
1141
1142 gpio = devm_gpiod_get_optional(dev->dev, irq_con_id, GPIOD_IN);
1143 if (IS_ERR(gpio))
1144 return PTR_ERR(gpio);
1145
1146 dev->irq = gpiod_to_irq(gpio);
1147 }
1148
1149 if (broken_irq_dmi_id) {
1150 if (broken_irq_dmi_id->driver_data) {
1151 gpiod_remove_lookup_table(broken_irq_dmi_id->driver_data);
1152 } else {
1153 dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n",
1154 broken_irq_dmi_id->ident);
1155 dev->irq = 0;
1156 }
1157 }
1158
1159 dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
1160 return 0;
1161 }
1162
1163 #ifdef CONFIG_ACPI
bcm_acpi_probe(struct bcm_device * dev)1164 static int bcm_acpi_probe(struct bcm_device *dev)
1165 {
1166 LIST_HEAD(resources);
1167 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
1168 struct resource_entry *entry;
1169 int ret;
1170
1171 /* Retrieve UART ACPI info */
1172 dev->gpio_int_idx = -1;
1173 ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
1174 &resources, bcm_resource, dev);
1175 if (ret < 0)
1176 return ret;
1177
1178 resource_list_for_each_entry(entry, &resources) {
1179 if (resource_type(entry->res) == IORESOURCE_IRQ) {
1180 dev->irq = entry->res->start;
1181 break;
1182 }
1183 }
1184 acpi_dev_free_resource_list(&resources);
1185
1186 /* If the DSDT uses an Interrupt resource for the IRQ, then there are
1187 * only 2 GPIO resources, we use the irq-last mapping for this, since
1188 * we already have an irq the 3th / last mapping will not be used.
1189 */
1190 if (dev->irq)
1191 gpio_mapping = acpi_bcm_int_last_gpios;
1192 else if (dev->gpio_int_idx == 0)
1193 gpio_mapping = acpi_bcm_int_first_gpios;
1194 else if (dev->gpio_int_idx == 2)
1195 gpio_mapping = acpi_bcm_int_last_gpios;
1196 else
1197 dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n",
1198 dev->gpio_int_idx);
1199
1200 /* Warn if our expectations are not met. */
1201 if (dev->gpio_count != (dev->irq ? 2 : 3))
1202 dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n",
1203 dev->gpio_count);
1204
1205 ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
1206 if (ret)
1207 return ret;
1208
1209 if (irq_polarity != -1) {
1210 dev->irq_active_low = irq_polarity;
1211 dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n",
1212 dev->irq_active_low ? "low" : "high");
1213 }
1214
1215 return 0;
1216 }
1217 #else
bcm_acpi_probe(struct bcm_device * dev)1218 static int bcm_acpi_probe(struct bcm_device *dev)
1219 {
1220 return -EINVAL;
1221 }
1222 #endif /* CONFIG_ACPI */
1223
bcm_of_probe(struct bcm_device * bdev)1224 static int bcm_of_probe(struct bcm_device *bdev)
1225 {
1226 bdev->use_autobaud_mode = device_property_read_bool(bdev->dev,
1227 "brcm,requires-autobaud-mode");
1228 device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
1229 device_property_read_u8_array(bdev->dev, "brcm,bt-pcm-int-params",
1230 bdev->pcm_int_params, 5);
1231 bdev->irq = of_irq_get_byname(bdev->dev->of_node, "host-wakeup");
1232 bdev->irq_active_low = irq_get_trigger_type(bdev->irq)
1233 & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW);
1234 return 0;
1235 }
1236
bcm_probe(struct platform_device * pdev)1237 static int bcm_probe(struct platform_device *pdev)
1238 {
1239 struct bcm_device *dev;
1240 int ret;
1241
1242 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1243 if (!dev)
1244 return -ENOMEM;
1245
1246 dev->dev = &pdev->dev;
1247
1248 ret = platform_get_irq(pdev, 0);
1249 if (ret < 0)
1250 return ret;
1251
1252 dev->irq = ret;
1253
1254 /* Initialize routing field to an unused value */
1255 dev->pcm_int_params[0] = 0xff;
1256
1257 if (has_acpi_companion(&pdev->dev)) {
1258 ret = bcm_acpi_probe(dev);
1259 if (ret)
1260 return ret;
1261 }
1262
1263 ret = bcm_get_resources(dev);
1264 if (ret)
1265 return ret;
1266
1267 platform_set_drvdata(pdev, dev);
1268
1269 dev_info(&pdev->dev, "%s device registered.\n", dev->name);
1270
1271 /* Place this instance on the device list */
1272 mutex_lock(&bcm_device_lock);
1273 list_add_tail(&dev->list, &bcm_device_list);
1274 mutex_unlock(&bcm_device_lock);
1275
1276 ret = bcm_gpio_set_power(dev, false);
1277 if (ret)
1278 dev_err(&pdev->dev, "Failed to power down\n");
1279
1280 return 0;
1281 }
1282
bcm_remove(struct platform_device * pdev)1283 static void bcm_remove(struct platform_device *pdev)
1284 {
1285 struct bcm_device *dev = platform_get_drvdata(pdev);
1286
1287 mutex_lock(&bcm_device_lock);
1288 list_del(&dev->list);
1289 mutex_unlock(&bcm_device_lock);
1290
1291 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
1292 }
1293
1294 static const struct hci_uart_proto bcm_proto = {
1295 .id = HCI_UART_BCM,
1296 .name = "Broadcom",
1297 .manufacturer = 15,
1298 .init_speed = 115200,
1299 .open = bcm_open,
1300 .close = bcm_close,
1301 .flush = bcm_flush,
1302 .setup = bcm_setup,
1303 .set_baudrate = bcm_set_baudrate,
1304 .recv = bcm_recv,
1305 .enqueue = bcm_enqueue,
1306 .dequeue = bcm_dequeue,
1307 };
1308
1309 #ifdef CONFIG_ACPI
1310
1311 /* bcm43430a0/a1 BT does not support 48MHz UART clock, limit to 2000000 baud */
1312 static struct bcm_device_data bcm43430_device_data = {
1313 .max_speed = 2000000,
1314 };
1315
1316 static const struct acpi_device_id bcm_acpi_match[] = {
1317 { "BCM2E00" },
1318 { "BCM2E01" },
1319 { "BCM2E02" },
1320 { "BCM2E03" },
1321 { "BCM2E04" },
1322 { "BCM2E05" },
1323 { "BCM2E06" },
1324 { "BCM2E07" },
1325 { "BCM2E08" },
1326 { "BCM2E09" },
1327 { "BCM2E0A" },
1328 { "BCM2E0B" },
1329 { "BCM2E0C" },
1330 { "BCM2E0D" },
1331 { "BCM2E0E" },
1332 { "BCM2E0F" },
1333 { "BCM2E10" },
1334 { "BCM2E11" },
1335 { "BCM2E12" },
1336 { "BCM2E13" },
1337 { "BCM2E14" },
1338 { "BCM2E15" },
1339 { "BCM2E16" },
1340 { "BCM2E17" },
1341 { "BCM2E18" },
1342 { "BCM2E19" },
1343 { "BCM2E1A" },
1344 { "BCM2E1B" },
1345 { "BCM2E1C" },
1346 { "BCM2E1D" },
1347 { "BCM2E1F" },
1348 { "BCM2E20" },
1349 { "BCM2E21" },
1350 { "BCM2E22" },
1351 { "BCM2E23" },
1352 { "BCM2E24" },
1353 { "BCM2E25" },
1354 { "BCM2E26" },
1355 { "BCM2E27" },
1356 { "BCM2E28" },
1357 { "BCM2E29" },
1358 { "BCM2E2A" },
1359 { "BCM2E2B" },
1360 { "BCM2E2C" },
1361 { "BCM2E2D" },
1362 { "BCM2E2E" },
1363 { "BCM2E2F" },
1364 { "BCM2E30" },
1365 { "BCM2E31" },
1366 { "BCM2E32" },
1367 { "BCM2E33" },
1368 { "BCM2E34" },
1369 { "BCM2E35" },
1370 { "BCM2E36" },
1371 { "BCM2E37" },
1372 { "BCM2E38" },
1373 { "BCM2E39" },
1374 { "BCM2E3A" },
1375 { "BCM2E3B" },
1376 { "BCM2E3C" },
1377 { "BCM2E3D" },
1378 { "BCM2E3E" },
1379 { "BCM2E3F" },
1380 { "BCM2E40" },
1381 { "BCM2E41" },
1382 { "BCM2E42" },
1383 { "BCM2E43" },
1384 { "BCM2E44" },
1385 { "BCM2E45" },
1386 { "BCM2E46" },
1387 { "BCM2E47" },
1388 { "BCM2E48" },
1389 { "BCM2E49" },
1390 { "BCM2E4A" },
1391 { "BCM2E4B" },
1392 { "BCM2E4C" },
1393 { "BCM2E4D" },
1394 { "BCM2E4E" },
1395 { "BCM2E4F" },
1396 { "BCM2E50" },
1397 { "BCM2E51" },
1398 { "BCM2E52" },
1399 { "BCM2E53" },
1400 { "BCM2E54" },
1401 { "BCM2E55" },
1402 { "BCM2E56" },
1403 { "BCM2E57" },
1404 { "BCM2E58" },
1405 { "BCM2E59" },
1406 { "BCM2E5A" },
1407 { "BCM2E5B" },
1408 { "BCM2E5C" },
1409 { "BCM2E5D" },
1410 { "BCM2E5E" },
1411 { "BCM2E5F" },
1412 { "BCM2E60" },
1413 { "BCM2E61" },
1414 { "BCM2E62" },
1415 { "BCM2E63" },
1416 { "BCM2E64" },
1417 { "BCM2E65" },
1418 { "BCM2E66" },
1419 { "BCM2E67" },
1420 { "BCM2E68" },
1421 { "BCM2E69" },
1422 { "BCM2E6B" },
1423 { "BCM2E6D" },
1424 { "BCM2E6E" },
1425 { "BCM2E6F" },
1426 { "BCM2E70" },
1427 { "BCM2E71" },
1428 { "BCM2E72" },
1429 { "BCM2E73" },
1430 { "BCM2E74", (long)&bcm43430_device_data },
1431 { "BCM2E75", (long)&bcm43430_device_data },
1432 { "BCM2E76" },
1433 { "BCM2E77" },
1434 { "BCM2E78" },
1435 { "BCM2E79" },
1436 { "BCM2E7A" },
1437 { "BCM2E7B", (long)&bcm43430_device_data },
1438 { "BCM2E7C" },
1439 { "BCM2E7D" },
1440 { "BCM2E7E" },
1441 { "BCM2E7F" },
1442 { "BCM2E80", (long)&bcm43430_device_data },
1443 { "BCM2E81" },
1444 { "BCM2E82" },
1445 { "BCM2E83" },
1446 { "BCM2E84" },
1447 { "BCM2E85" },
1448 { "BCM2E86" },
1449 { "BCM2E87" },
1450 { "BCM2E88" },
1451 { "BCM2E89", (long)&bcm43430_device_data },
1452 { "BCM2E8A" },
1453 { "BCM2E8B" },
1454 { "BCM2E8C" },
1455 { "BCM2E8D" },
1456 { "BCM2E8E" },
1457 { "BCM2E90" },
1458 { "BCM2E92" },
1459 { "BCM2E93" },
1460 { "BCM2E94", (long)&bcm43430_device_data },
1461 { "BCM2E95" },
1462 { "BCM2E96" },
1463 { "BCM2E97" },
1464 { "BCM2E98" },
1465 { "BCM2E99", (long)&bcm43430_device_data },
1466 { "BCM2E9A" },
1467 { "BCM2E9B", (long)&bcm43430_device_data },
1468 { "BCM2E9C" },
1469 { "BCM2E9D" },
1470 { "BCM2E9F", (long)&bcm43430_device_data },
1471 { "BCM2EA0" },
1472 { "BCM2EA1" },
1473 { "BCM2EA2", (long)&bcm43430_device_data },
1474 { "BCM2EA3", (long)&bcm43430_device_data },
1475 { "BCM2EA4", (long)&bcm43430_device_data }, /* bcm43455 */
1476 { "BCM2EA5" },
1477 { "BCM2EA6" },
1478 { "BCM2EA7" },
1479 { "BCM2EA8" },
1480 { "BCM2EA9" },
1481 { "BCM2EAA", (long)&bcm43430_device_data },
1482 { "BCM2EAB", (long)&bcm43430_device_data },
1483 { "BCM2EAC", (long)&bcm43430_device_data },
1484 { },
1485 };
1486 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
1487 #endif
1488
1489 /* suspend and resume callbacks */
1490 static const struct dev_pm_ops bcm_pm_ops = {
1491 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
1492 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
1493 };
1494
1495 static struct platform_driver bcm_driver = {
1496 .probe = bcm_probe,
1497 .remove = bcm_remove,
1498 .driver = {
1499 .name = "hci_bcm",
1500 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1501 .pm = &bcm_pm_ops,
1502 },
1503 };
1504
bcm_serdev_probe(struct serdev_device * serdev)1505 static int bcm_serdev_probe(struct serdev_device *serdev)
1506 {
1507 struct bcm_device *bcmdev;
1508 const struct bcm_device_data *data;
1509 int err;
1510
1511 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
1512 if (!bcmdev)
1513 return -ENOMEM;
1514
1515 bcmdev->dev = &serdev->dev;
1516 #ifdef CONFIG_PM
1517 bcmdev->hu = &bcmdev->serdev_hu;
1518 #endif
1519 bcmdev->serdev_hu.serdev = serdev;
1520 serdev_device_set_drvdata(serdev, bcmdev);
1521
1522 /* Initialize routing field to an unused value */
1523 bcmdev->pcm_int_params[0] = 0xff;
1524
1525 if (has_acpi_companion(&serdev->dev))
1526 err = bcm_acpi_probe(bcmdev);
1527 else
1528 err = bcm_of_probe(bcmdev);
1529 if (err)
1530 return err;
1531
1532 err = bcm_get_resources(bcmdev);
1533 if (err)
1534 return err;
1535
1536 if (!bcmdev->shutdown) {
1537 dev_warn(&serdev->dev,
1538 "No reset resource, using default baud rate\n");
1539 bcmdev->oper_speed = bcmdev->init_speed;
1540 }
1541
1542 err = bcm_gpio_set_power(bcmdev, false);
1543 if (err)
1544 dev_err(&serdev->dev, "Failed to power down\n");
1545
1546 data = device_get_match_data(bcmdev->dev);
1547 if (data) {
1548 bcmdev->max_autobaud_speed = data->max_autobaud_speed;
1549 bcmdev->no_early_set_baudrate = data->no_early_set_baudrate;
1550 bcmdev->drive_rts_on_open = data->drive_rts_on_open;
1551 bcmdev->no_uart_clock_set = data->no_uart_clock_set;
1552 if (data->max_speed && bcmdev->oper_speed > data->max_speed)
1553 bcmdev->oper_speed = data->max_speed;
1554 }
1555
1556 return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
1557 }
1558
bcm_serdev_remove(struct serdev_device * serdev)1559 static void bcm_serdev_remove(struct serdev_device *serdev)
1560 {
1561 struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
1562
1563 hci_uart_unregister_device(&bcmdev->serdev_hu);
1564 }
1565
1566 #ifdef CONFIG_OF
1567 static struct bcm_device_data bcm4354_device_data = {
1568 .no_early_set_baudrate = true,
1569 };
1570
1571 static struct bcm_device_data bcm43438_device_data = {
1572 .drive_rts_on_open = true,
1573 };
1574
1575 static struct bcm_device_data cyw4373a0_device_data = {
1576 .no_uart_clock_set = true,
1577 };
1578
1579 static struct bcm_device_data cyw55572_device_data = {
1580 .max_autobaud_speed = 921600,
1581 };
1582
1583 static const struct of_device_id bcm_bluetooth_of_match[] = {
1584 { .compatible = "brcm,bcm20702a1" },
1585 { .compatible = "brcm,bcm4329-bt" },
1586 { .compatible = "brcm,bcm4330-bt" },
1587 { .compatible = "brcm,bcm4334-bt" },
1588 { .compatible = "brcm,bcm4345c5" },
1589 { .compatible = "brcm,bcm43430a0-bt" },
1590 { .compatible = "brcm,bcm43430a1-bt" },
1591 { .compatible = "brcm,bcm43438-bt", .data = &bcm43438_device_data },
1592 { .compatible = "brcm,bcm4349-bt", .data = &bcm43438_device_data },
1593 { .compatible = "brcm,bcm43540-bt", .data = &bcm4354_device_data },
1594 { .compatible = "brcm,bcm4335a0" },
1595 { .compatible = "cypress,cyw4373a0-bt", .data = &cyw4373a0_device_data },
1596 { .compatible = "infineon,cyw55572-bt", .data = &cyw55572_device_data },
1597 { },
1598 };
1599 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
1600 #endif
1601
1602 static struct serdev_device_driver bcm_serdev_driver = {
1603 .probe = bcm_serdev_probe,
1604 .remove = bcm_serdev_remove,
1605 .driver = {
1606 .name = "hci_uart_bcm",
1607 .of_match_table = of_match_ptr(bcm_bluetooth_of_match),
1608 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1609 .pm = &bcm_pm_ops,
1610 },
1611 };
1612
bcm_init(void)1613 int __init bcm_init(void)
1614 {
1615 /* For now, we need to keep both platform device
1616 * driver (ACPI generated) and serdev driver (DT).
1617 */
1618 platform_driver_register(&bcm_driver);
1619 serdev_device_driver_register(&bcm_serdev_driver);
1620
1621 return hci_uart_register_proto(&bcm_proto);
1622 }
1623
bcm_deinit(void)1624 int __exit bcm_deinit(void)
1625 {
1626 platform_driver_unregister(&bcm_driver);
1627 serdev_device_driver_unregister(&bcm_serdev_driver);
1628
1629 return hci_uart_unregister_proto(&bcm_proto);
1630 }
1631