Commit | Line | Data |
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7237c4c9 SW |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (c) 2018 MediaTek Inc. | |
3 | ||
4 | /* | |
5 | * Bluetooth support for MediaTek serial devices | |
6 | * | |
7 | * Author: Sean Wang <sean.wang@mediatek.com> | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <asm/unaligned.h> | |
12 | #include <linux/atomic.h> | |
13 | #include <linux/clk.h> | |
14 | #include <linux/firmware.h> | |
22eaf6c9 | 15 | #include <linux/gpio/consumer.h> |
e0b67035 | 16 | #include <linux/iopoll.h> |
7237c4c9 SW |
17 | #include <linux/kernel.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/of.h> | |
22eaf6c9 SW |
20 | #include <linux/of_device.h> |
21 | #include <linux/pinctrl/consumer.h> | |
7237c4c9 | 22 | #include <linux/pm_runtime.h> |
22eaf6c9 | 23 | #include <linux/regulator/consumer.h> |
7237c4c9 SW |
24 | #include <linux/serdev.h> |
25 | #include <linux/skbuff.h> | |
26 | ||
27 | #include <net/bluetooth/bluetooth.h> | |
28 | #include <net/bluetooth/hci_core.h> | |
29 | ||
30 | #include "h4_recv.h" | |
f5c3f989 | 31 | #include "btmtk.h" |
7237c4c9 | 32 | |
22eaf6c9 | 33 | #define VERSION "0.2" |
7237c4c9 | 34 | |
7237c4c9 SW |
35 | #define MTK_STP_TLR_SIZE 2 |
36 | ||
37 | #define BTMTKUART_TX_STATE_ACTIVE 1 | |
38 | #define BTMTKUART_TX_STATE_WAKEUP 2 | |
39 | #define BTMTKUART_TX_WAIT_VND_EVT 3 | |
22eaf6c9 SW |
40 | #define BTMTKUART_REQUIRED_WAKEUP 4 |
41 | ||
42 | #define BTMTKUART_FLAG_STANDALONE_HW BIT(0) | |
7237c4c9 | 43 | |
7237c4c9 SW |
44 | struct mtk_stp_hdr { |
45 | u8 prefix; | |
46 | __be16 dlen; | |
47 | u8 cs; | |
48 | } __packed; | |
49 | ||
22eaf6c9 SW |
50 | struct btmtkuart_data { |
51 | unsigned int flags; | |
52 | const char *fwname; | |
53 | }; | |
54 | ||
7237c4c9 SW |
55 | struct btmtkuart_dev { |
56 | struct hci_dev *hdev; | |
57 | struct serdev_device *serdev; | |
7237c4c9 | 58 | |
05582561 SW |
59 | struct clk *clk; |
60 | struct clk *osc; | |
22eaf6c9 SW |
61 | struct regulator *vcc; |
62 | struct gpio_desc *reset; | |
a3cb6d60 | 63 | struct gpio_desc *boot; |
22eaf6c9 SW |
64 | struct pinctrl *pinctrl; |
65 | struct pinctrl_state *pins_runtime; | |
66 | struct pinctrl_state *pins_boot; | |
67 | speed_t desired_speed; | |
68 | speed_t curr_speed; | |
69 | ||
7237c4c9 SW |
70 | struct work_struct tx_work; |
71 | unsigned long tx_state; | |
72 | struct sk_buff_head txq; | |
73 | ||
74 | struct sk_buff *rx_skb; | |
e0b67035 | 75 | struct sk_buff *evt_skb; |
7237c4c9 SW |
76 | |
77 | u8 stp_pad[6]; | |
78 | u8 stp_cursor; | |
79 | u16 stp_dlen; | |
22eaf6c9 SW |
80 | |
81 | const struct btmtkuart_data *data; | |
7237c4c9 SW |
82 | }; |
83 | ||
22eaf6c9 SW |
84 | #define btmtkuart_is_standalone(bdev) \ |
85 | ((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW) | |
86 | #define btmtkuart_is_builtin_soc(bdev) \ | |
87 | !((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW) | |
88 | ||
88e5f366 SW |
89 | static int mtk_hci_wmt_sync(struct hci_dev *hdev, |
90 | struct btmtk_hci_wmt_params *wmt_params) | |
7237c4c9 SW |
91 | { |
92 | struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); | |
e0b67035 SW |
93 | struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc; |
94 | u32 hlen, status = BTMTK_WMT_INVALID; | |
95 | struct btmtk_hci_wmt_evt *wmt_evt; | |
f5c3f989 SW |
96 | struct btmtk_hci_wmt_cmd *wc; |
97 | struct btmtk_wmt_hdr *hdr; | |
7237c4c9 SW |
98 | int err; |
99 | ||
f5c3f989 | 100 | /* Send the WMT command and wait until the WMT event returns */ |
88e5f366 | 101 | hlen = sizeof(*hdr) + wmt_params->dlen; |
3e5f2d90 DL |
102 | if (hlen > 255) { |
103 | err = -EINVAL; | |
104 | goto err_free_skb; | |
105 | } | |
7237c4c9 | 106 | |
f5c3f989 | 107 | wc = kzalloc(hlen, GFP_KERNEL); |
a76d269a DC |
108 | if (!wc) { |
109 | err = -ENOMEM; | |
110 | goto err_free_skb; | |
111 | } | |
f5c3f989 SW |
112 | |
113 | hdr = &wc->hdr; | |
7237c4c9 | 114 | hdr->dir = 1; |
88e5f366 SW |
115 | hdr->op = wmt_params->op; |
116 | hdr->dlen = cpu_to_le16(wmt_params->dlen + 1); | |
117 | hdr->flag = wmt_params->flag; | |
f5c3f989 | 118 | memcpy(wc->data, wmt_params->data, wmt_params->dlen); |
7237c4c9 SW |
119 | |
120 | set_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); | |
121 | ||
f5c3f989 | 122 | err = __hci_cmd_send(hdev, 0xfc6f, hlen, wc); |
7237c4c9 SW |
123 | if (err < 0) { |
124 | clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); | |
f5c3f989 | 125 | goto err_free_wc; |
7237c4c9 SW |
126 | } |
127 | ||
128 | /* The vendor specific WMT commands are all answered by a vendor | |
129 | * specific event and will not have the Command Status or Command | |
130 | * Complete as with usual HCI command flow control. | |
131 | * | |
132 | * After sending the command, wait for BTMTKUART_TX_WAIT_VND_EVT | |
adf5d730 | 133 | * state to be cleared. The driver specific event receive routine |
7237c4c9 SW |
134 | * will clear that state and with that indicate completion of the |
135 | * WMT command. | |
136 | */ | |
137 | err = wait_on_bit_timeout(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT, | |
138 | TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT); | |
139 | if (err == -EINTR) { | |
140 | bt_dev_err(hdev, "Execution of wmt command interrupted"); | |
77f328db | 141 | clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); |
f5c3f989 | 142 | goto err_free_wc; |
7237c4c9 SW |
143 | } |
144 | ||
145 | if (err) { | |
146 | bt_dev_err(hdev, "Execution of wmt command timed out"); | |
77f328db | 147 | clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); |
3e5f2d90 | 148 | err = -ETIMEDOUT; |
f5c3f989 | 149 | goto err_free_wc; |
7237c4c9 SW |
150 | } |
151 | ||
e0b67035 SW |
152 | /* Parse and handle the return WMT event */ |
153 | wmt_evt = (struct btmtk_hci_wmt_evt *)bdev->evt_skb->data; | |
154 | if (wmt_evt->whdr.op != hdr->op) { | |
155 | bt_dev_err(hdev, "Wrong op received %d expected %d", | |
156 | wmt_evt->whdr.op, hdr->op); | |
157 | err = -EIO; | |
a76d269a | 158 | goto err_free_wc; |
e0b67035 SW |
159 | } |
160 | ||
161 | switch (wmt_evt->whdr.op) { | |
f5c3f989 | 162 | case BTMTK_WMT_SEMAPHORE: |
e0b67035 SW |
163 | if (wmt_evt->whdr.flag == 2) |
164 | status = BTMTK_WMT_PATCH_UNDONE; | |
165 | else | |
166 | status = BTMTK_WMT_PATCH_DONE; | |
167 | break; | |
f5c3f989 | 168 | case BTMTK_WMT_FUNC_CTRL: |
e0b67035 SW |
169 | wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt; |
170 | if (be16_to_cpu(wmt_evt_funcc->status) == 0x404) | |
171 | status = BTMTK_WMT_ON_DONE; | |
172 | else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420) | |
173 | status = BTMTK_WMT_ON_PROGRESS; | |
174 | else | |
175 | status = BTMTK_WMT_ON_UNDONE; | |
176 | break; | |
177 | } | |
178 | ||
179 | if (wmt_params->status) | |
180 | *wmt_params->status = status; | |
181 | ||
a76d269a DC |
182 | err_free_wc: |
183 | kfree(wc); | |
e0b67035 SW |
184 | err_free_skb: |
185 | kfree_skb(bdev->evt_skb); | |
186 | bdev->evt_skb = NULL; | |
187 | ||
188 | return err; | |
7237c4c9 SW |
189 | } |
190 | ||
7237c4c9 SW |
191 | static int btmtkuart_recv_event(struct hci_dev *hdev, struct sk_buff *skb) |
192 | { | |
193 | struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); | |
194 | struct hci_event_hdr *hdr = (void *)skb->data; | |
195 | int err; | |
196 | ||
e0b67035 SW |
197 | /* When someone waits for the WMT event, the skb is being cloned |
198 | * and being processed the events from there then. | |
199 | */ | |
200 | if (test_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state)) { | |
201 | bdev->evt_skb = skb_clone(skb, GFP_KERNEL); | |
202 | if (!bdev->evt_skb) { | |
203 | err = -ENOMEM; | |
204 | goto err_out; | |
205 | } | |
206 | } | |
207 | ||
7237c4c9 | 208 | err = hci_recv_frame(hdev, skb); |
e0b67035 SW |
209 | if (err < 0) |
210 | goto err_free_skb; | |
7237c4c9 | 211 | |
6ac034a7 | 212 | if (hdr->evt == HCI_EV_WMT) { |
7237c4c9 SW |
213 | if (test_and_clear_bit(BTMTKUART_TX_WAIT_VND_EVT, |
214 | &bdev->tx_state)) { | |
215 | /* Barrier to sync with other CPUs */ | |
216 | smp_mb__after_atomic(); | |
217 | wake_up_bit(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT); | |
218 | } | |
219 | } | |
220 | ||
e0b67035 SW |
221 | return 0; |
222 | ||
223 | err_free_skb: | |
224 | kfree_skb(bdev->evt_skb); | |
225 | bdev->evt_skb = NULL; | |
226 | ||
227 | err_out: | |
7237c4c9 SW |
228 | return err; |
229 | } | |
230 | ||
231 | static const struct h4_recv_pkt mtk_recv_pkts[] = { | |
232 | { H4_RECV_ACL, .recv = hci_recv_frame }, | |
233 | { H4_RECV_SCO, .recv = hci_recv_frame }, | |
234 | { H4_RECV_EVENT, .recv = btmtkuart_recv_event }, | |
235 | }; | |
236 | ||
237 | static void btmtkuart_tx_work(struct work_struct *work) | |
238 | { | |
239 | struct btmtkuart_dev *bdev = container_of(work, struct btmtkuart_dev, | |
240 | tx_work); | |
241 | struct serdev_device *serdev = bdev->serdev; | |
242 | struct hci_dev *hdev = bdev->hdev; | |
243 | ||
244 | while (1) { | |
245 | clear_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state); | |
246 | ||
247 | while (1) { | |
248 | struct sk_buff *skb = skb_dequeue(&bdev->txq); | |
249 | int len; | |
250 | ||
251 | if (!skb) | |
252 | break; | |
253 | ||
254 | len = serdev_device_write_buf(serdev, skb->data, | |
255 | skb->len); | |
256 | hdev->stat.byte_tx += len; | |
257 | ||
258 | skb_pull(skb, len); | |
259 | if (skb->len > 0) { | |
260 | skb_queue_head(&bdev->txq, skb); | |
261 | break; | |
262 | } | |
263 | ||
264 | switch (hci_skb_pkt_type(skb)) { | |
265 | case HCI_COMMAND_PKT: | |
266 | hdev->stat.cmd_tx++; | |
267 | break; | |
268 | case HCI_ACLDATA_PKT: | |
269 | hdev->stat.acl_tx++; | |
270 | break; | |
271 | case HCI_SCODATA_PKT: | |
272 | hdev->stat.sco_tx++; | |
273 | break; | |
274 | } | |
275 | ||
276 | kfree_skb(skb); | |
277 | } | |
278 | ||
279 | if (!test_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state)) | |
280 | break; | |
281 | } | |
282 | ||
283 | clear_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state); | |
284 | } | |
285 | ||
286 | static void btmtkuart_tx_wakeup(struct btmtkuart_dev *bdev) | |
287 | { | |
288 | if (test_and_set_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state)) | |
289 | set_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state); | |
290 | ||
291 | schedule_work(&bdev->tx_work); | |
292 | } | |
293 | ||
294 | static const unsigned char * | |
295 | mtk_stp_split(struct btmtkuart_dev *bdev, const unsigned char *data, int count, | |
296 | int *sz_h4) | |
297 | { | |
298 | struct mtk_stp_hdr *shdr; | |
299 | ||
300 | /* The cursor is reset when all the data of STP is consumed out */ | |
301 | if (!bdev->stp_dlen && bdev->stp_cursor >= 6) | |
302 | bdev->stp_cursor = 0; | |
303 | ||
304 | /* Filling pad until all STP info is obtained */ | |
305 | while (bdev->stp_cursor < 6 && count > 0) { | |
306 | bdev->stp_pad[bdev->stp_cursor] = *data; | |
307 | bdev->stp_cursor++; | |
308 | data++; | |
309 | count--; | |
310 | } | |
311 | ||
312 | /* Retrieve STP info and have a sanity check */ | |
313 | if (!bdev->stp_dlen && bdev->stp_cursor >= 6) { | |
314 | shdr = (struct mtk_stp_hdr *)&bdev->stp_pad[2]; | |
315 | bdev->stp_dlen = be16_to_cpu(shdr->dlen) & 0x0fff; | |
316 | ||
317 | /* Resync STP when unexpected data is being read */ | |
318 | if (shdr->prefix != 0x80 || bdev->stp_dlen > 2048) { | |
319 | bt_dev_err(bdev->hdev, "stp format unexpect (%d, %d)", | |
320 | shdr->prefix, bdev->stp_dlen); | |
321 | bdev->stp_cursor = 2; | |
322 | bdev->stp_dlen = 0; | |
323 | } | |
324 | } | |
325 | ||
326 | /* Directly quit when there's no data found for H4 can process */ | |
327 | if (count <= 0) | |
328 | return NULL; | |
329 | ||
330 | /* Tranlate to how much the size of data H4 can handle so far */ | |
331 | *sz_h4 = min_t(int, count, bdev->stp_dlen); | |
332 | ||
333 | /* Update the remaining size of STP packet */ | |
334 | bdev->stp_dlen -= *sz_h4; | |
335 | ||
336 | /* Data points to STP payload which can be handled by H4 */ | |
337 | return data; | |
338 | } | |
339 | ||
340 | static int btmtkuart_recv(struct hci_dev *hdev, const u8 *data, size_t count) | |
341 | { | |
342 | struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); | |
343 | const unsigned char *p_left = data, *p_h4; | |
344 | int sz_left = count, sz_h4, adv; | |
345 | int err; | |
346 | ||
347 | while (sz_left > 0) { | |
348 | /* The serial data received from MT7622 BT controller is | |
349 | * at all time padded around with the STP header and tailer. | |
350 | * | |
351 | * A full STP packet is looking like | |
352 | * ----------------------------------- | |
353 | * | STP header | H:4 | STP tailer | | |
354 | * ----------------------------------- | |
355 | * but it doesn't guarantee to contain a full H:4 packet which | |
356 | * means that it's possible for multiple STP packets forms a | |
357 | * full H:4 packet that means extra STP header + length doesn't | |
358 | * indicate a full H:4 frame, things can fragment. Whose length | |
359 | * recorded in STP header just shows up the most length the | |
360 | * H:4 engine can handle currently. | |
361 | */ | |
362 | ||
363 | p_h4 = mtk_stp_split(bdev, p_left, sz_left, &sz_h4); | |
364 | if (!p_h4) | |
365 | break; | |
366 | ||
367 | adv = p_h4 - p_left; | |
368 | sz_left -= adv; | |
369 | p_left += adv; | |
370 | ||
371 | bdev->rx_skb = h4_recv_buf(bdev->hdev, bdev->rx_skb, p_h4, | |
372 | sz_h4, mtk_recv_pkts, | |
330ad75f | 373 | ARRAY_SIZE(mtk_recv_pkts)); |
7237c4c9 SW |
374 | if (IS_ERR(bdev->rx_skb)) { |
375 | err = PTR_ERR(bdev->rx_skb); | |
376 | bt_dev_err(bdev->hdev, | |
377 | "Frame reassembly failed (%d)", err); | |
378 | bdev->rx_skb = NULL; | |
379 | return err; | |
380 | } | |
381 | ||
382 | sz_left -= sz_h4; | |
383 | p_left += sz_h4; | |
384 | } | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | static int btmtkuart_receive_buf(struct serdev_device *serdev, const u8 *data, | |
390 | size_t count) | |
391 | { | |
392 | struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); | |
393 | int err; | |
394 | ||
395 | err = btmtkuart_recv(bdev->hdev, data, count); | |
396 | if (err < 0) | |
397 | return err; | |
398 | ||
399 | bdev->hdev->stat.byte_rx += count; | |
400 | ||
401 | return count; | |
402 | } | |
403 | ||
404 | static void btmtkuart_write_wakeup(struct serdev_device *serdev) | |
405 | { | |
406 | struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); | |
407 | ||
408 | btmtkuart_tx_wakeup(bdev); | |
409 | } | |
410 | ||
411 | static const struct serdev_device_ops btmtkuart_client_ops = { | |
412 | .receive_buf = btmtkuart_receive_buf, | |
413 | .write_wakeup = btmtkuart_write_wakeup, | |
414 | }; | |
415 | ||
416 | static int btmtkuart_open(struct hci_dev *hdev) | |
417 | { | |
418 | struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); | |
419 | struct device *dev; | |
420 | int err; | |
421 | ||
422 | err = serdev_device_open(bdev->serdev); | |
423 | if (err) { | |
424 | bt_dev_err(hdev, "Unable to open UART device %s", | |
425 | dev_name(&bdev->serdev->dev)); | |
426 | goto err_open; | |
427 | } | |
428 | ||
22eaf6c9 SW |
429 | if (btmtkuart_is_standalone(bdev)) { |
430 | if (bdev->curr_speed != bdev->desired_speed) | |
431 | err = serdev_device_set_baudrate(bdev->serdev, | |
432 | 115200); | |
433 | else | |
434 | err = serdev_device_set_baudrate(bdev->serdev, | |
435 | bdev->desired_speed); | |
436 | ||
437 | if (err < 0) { | |
438 | bt_dev_err(hdev, "Unable to set baudrate UART device %s", | |
439 | dev_name(&bdev->serdev->dev)); | |
440 | goto err_serdev_close; | |
441 | } | |
442 | ||
443 | serdev_device_set_flow_control(bdev->serdev, false); | |
444 | } | |
445 | ||
7237c4c9 SW |
446 | bdev->stp_cursor = 2; |
447 | bdev->stp_dlen = 0; | |
448 | ||
449 | dev = &bdev->serdev->dev; | |
450 | ||
451 | /* Enable the power domain and clock the device requires */ | |
452 | pm_runtime_enable(dev); | |
a1b2fdf9 ZQ |
453 | err = pm_runtime_resume_and_get(dev); |
454 | if (err < 0) | |
7237c4c9 | 455 | goto err_disable_rpm; |
7237c4c9 SW |
456 | |
457 | err = clk_prepare_enable(bdev->clk); | |
458 | if (err < 0) | |
459 | goto err_put_rpm; | |
460 | ||
461 | return 0; | |
462 | ||
463 | err_put_rpm: | |
464 | pm_runtime_put_sync(dev); | |
465 | err_disable_rpm: | |
466 | pm_runtime_disable(dev); | |
22eaf6c9 SW |
467 | err_serdev_close: |
468 | serdev_device_close(bdev->serdev); | |
7237c4c9 SW |
469 | err_open: |
470 | return err; | |
471 | } | |
472 | ||
473 | static int btmtkuart_close(struct hci_dev *hdev) | |
474 | { | |
475 | struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); | |
476 | struct device *dev = &bdev->serdev->dev; | |
477 | ||
478 | /* Shutdown the clock and power domain the device requires */ | |
479 | clk_disable_unprepare(bdev->clk); | |
480 | pm_runtime_put_sync(dev); | |
481 | pm_runtime_disable(dev); | |
482 | ||
483 | serdev_device_close(bdev->serdev); | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | static int btmtkuart_flush(struct hci_dev *hdev) | |
489 | { | |
490 | struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); | |
491 | ||
492 | /* Flush any pending characters */ | |
493 | serdev_device_write_flush(bdev->serdev); | |
494 | skb_queue_purge(&bdev->txq); | |
495 | ||
496 | cancel_work_sync(&bdev->tx_work); | |
497 | ||
498 | kfree_skb(bdev->rx_skb); | |
499 | bdev->rx_skb = NULL; | |
500 | ||
501 | bdev->stp_cursor = 2; | |
502 | bdev->stp_dlen = 0; | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
e0b67035 SW |
507 | static int btmtkuart_func_query(struct hci_dev *hdev) |
508 | { | |
509 | struct btmtk_hci_wmt_params wmt_params; | |
510 | int status, err; | |
511 | u8 param = 0; | |
512 | ||
513 | /* Query whether the function is enabled */ | |
f5c3f989 | 514 | wmt_params.op = BTMTK_WMT_FUNC_CTRL; |
e0b67035 SW |
515 | wmt_params.flag = 4; |
516 | wmt_params.dlen = sizeof(param); | |
517 | wmt_params.data = ¶m; | |
518 | wmt_params.status = &status; | |
519 | ||
520 | err = mtk_hci_wmt_sync(hdev, &wmt_params); | |
521 | if (err < 0) { | |
522 | bt_dev_err(hdev, "Failed to query function status (%d)", err); | |
523 | return err; | |
524 | } | |
525 | ||
526 | return status; | |
527 | } | |
528 | ||
22eaf6c9 SW |
529 | static int btmtkuart_change_baudrate(struct hci_dev *hdev) |
530 | { | |
531 | struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); | |
532 | struct btmtk_hci_wmt_params wmt_params; | |
cac63f9b | 533 | __le32 baudrate; |
22eaf6c9 SW |
534 | u8 param; |
535 | int err; | |
536 | ||
537 | /* Indicate the device to enter the probe state the host is | |
538 | * ready to change a new baudrate. | |
539 | */ | |
540 | baudrate = cpu_to_le32(bdev->desired_speed); | |
f5c3f989 | 541 | wmt_params.op = BTMTK_WMT_HIF; |
22eaf6c9 SW |
542 | wmt_params.flag = 1; |
543 | wmt_params.dlen = 4; | |
544 | wmt_params.data = &baudrate; | |
545 | wmt_params.status = NULL; | |
546 | ||
547 | err = mtk_hci_wmt_sync(hdev, &wmt_params); | |
548 | if (err < 0) { | |
549 | bt_dev_err(hdev, "Failed to device baudrate (%d)", err); | |
550 | return err; | |
551 | } | |
552 | ||
553 | err = serdev_device_set_baudrate(bdev->serdev, | |
554 | bdev->desired_speed); | |
555 | if (err < 0) { | |
556 | bt_dev_err(hdev, "Failed to set up host baudrate (%d)", | |
557 | err); | |
558 | return err; | |
559 | } | |
560 | ||
561 | serdev_device_set_flow_control(bdev->serdev, false); | |
562 | ||
563 | /* Send a dummy byte 0xff to activate the new baudrate */ | |
564 | param = 0xff; | |
d3a0fe6b | 565 | err = serdev_device_write_buf(bdev->serdev, ¶m, sizeof(param)); |
22eaf6c9 SW |
566 | if (err < 0 || err < sizeof(param)) |
567 | return err; | |
568 | ||
569 | serdev_device_wait_until_sent(bdev->serdev, 0); | |
570 | ||
571 | /* Wait some time for the device changing baudrate done */ | |
572 | usleep_range(20000, 22000); | |
573 | ||
574 | /* Test the new baudrate */ | |
f5c3f989 | 575 | wmt_params.op = BTMTK_WMT_TEST; |
22eaf6c9 SW |
576 | wmt_params.flag = 7; |
577 | wmt_params.dlen = 0; | |
578 | wmt_params.data = NULL; | |
579 | wmt_params.status = NULL; | |
580 | ||
581 | err = mtk_hci_wmt_sync(hdev, &wmt_params); | |
582 | if (err < 0) { | |
583 | bt_dev_err(hdev, "Failed to test new baudrate (%d)", | |
584 | err); | |
585 | return err; | |
586 | } | |
587 | ||
588 | bdev->curr_speed = bdev->desired_speed; | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
7237c4c9 SW |
593 | static int btmtkuart_setup(struct hci_dev *hdev) |
594 | { | |
22eaf6c9 | 595 | struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); |
88e5f366 | 596 | struct btmtk_hci_wmt_params wmt_params; |
e0b67035 SW |
597 | ktime_t calltime, delta, rettime; |
598 | struct btmtk_tci_sleep tci_sleep; | |
599 | unsigned long long duration; | |
600 | struct sk_buff *skb; | |
601 | int err, status; | |
7237c4c9 | 602 | u8 param = 0x1; |
7237c4c9 | 603 | |
e0b67035 | 604 | calltime = ktime_get(); |
7237c4c9 | 605 | |
22eaf6c9 SW |
606 | /* Wakeup MCUSYS is required for certain devices before we start to |
607 | * do any setups. | |
608 | */ | |
609 | if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) { | |
f5c3f989 | 610 | wmt_params.op = BTMTK_WMT_WAKEUP; |
22eaf6c9 SW |
611 | wmt_params.flag = 3; |
612 | wmt_params.dlen = 0; | |
613 | wmt_params.data = NULL; | |
614 | wmt_params.status = NULL; | |
615 | ||
616 | err = mtk_hci_wmt_sync(hdev, &wmt_params); | |
617 | if (err < 0) { | |
618 | bt_dev_err(hdev, "Failed to wakeup the chip (%d)", err); | |
619 | return err; | |
620 | } | |
621 | ||
622 | clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state); | |
623 | } | |
624 | ||
625 | if (btmtkuart_is_standalone(bdev)) | |
626 | btmtkuart_change_baudrate(hdev); | |
627 | ||
e0b67035 | 628 | /* Query whether the firmware is already download */ |
f5c3f989 | 629 | wmt_params.op = BTMTK_WMT_SEMAPHORE; |
e0b67035 | 630 | wmt_params.flag = 1; |
88e5f366 SW |
631 | wmt_params.dlen = 0; |
632 | wmt_params.data = NULL; | |
e0b67035 | 633 | wmt_params.status = &status; |
88e5f366 | 634 | |
88e5f366 | 635 | err = mtk_hci_wmt_sync(hdev, &wmt_params); |
7237c4c9 | 636 | if (err < 0) { |
e0b67035 SW |
637 | bt_dev_err(hdev, "Failed to query firmware status (%d)", err); |
638 | return err; | |
639 | } | |
640 | ||
641 | if (status == BTMTK_WMT_PATCH_DONE) { | |
642 | bt_dev_info(hdev, "Firmware already downloaded"); | |
643 | goto ignore_setup_fw; | |
644 | } | |
645 | ||
646 | /* Setup a firmware which the device definitely requires */ | |
f5c3f989 | 647 | err = btmtk_setup_firmware(hdev, bdev->data->fwname, mtk_hci_wmt_sync); |
e0b67035 | 648 | if (err < 0) |
7237c4c9 | 649 | return err; |
e0b67035 SW |
650 | |
651 | ignore_setup_fw: | |
652 | /* Query whether the device is already enabled */ | |
653 | err = readx_poll_timeout(btmtkuart_func_query, hdev, status, | |
654 | status < 0 || status != BTMTK_WMT_ON_PROGRESS, | |
655 | 2000, 5000000); | |
656 | /* -ETIMEDOUT happens */ | |
657 | if (err < 0) | |
658 | return err; | |
659 | ||
660 | /* The other errors happen in btusb_mtk_func_query */ | |
661 | if (status < 0) | |
662 | return status; | |
663 | ||
664 | if (status == BTMTK_WMT_ON_DONE) { | |
665 | bt_dev_info(hdev, "function already on"); | |
666 | goto ignore_func_on; | |
7237c4c9 SW |
667 | } |
668 | ||
669 | /* Enable Bluetooth protocol */ | |
f5c3f989 | 670 | wmt_params.op = BTMTK_WMT_FUNC_CTRL; |
88e5f366 SW |
671 | wmt_params.flag = 0; |
672 | wmt_params.dlen = sizeof(param); | |
673 | wmt_params.data = ¶m; | |
674 | wmt_params.status = NULL; | |
675 | ||
676 | err = mtk_hci_wmt_sync(hdev, &wmt_params); | |
7237c4c9 SW |
677 | if (err < 0) { |
678 | bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); | |
679 | return err; | |
680 | } | |
681 | ||
e0b67035 SW |
682 | ignore_func_on: |
683 | /* Apply the low power environment setup */ | |
684 | tci_sleep.mode = 0x5; | |
685 | tci_sleep.duration = cpu_to_le16(0x640); | |
686 | tci_sleep.host_duration = cpu_to_le16(0x640); | |
687 | tci_sleep.host_wakeup_pin = 0; | |
688 | tci_sleep.time_compensation = 0; | |
689 | ||
690 | skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep, | |
691 | HCI_INIT_TIMEOUT); | |
692 | if (IS_ERR(skb)) { | |
693 | err = PTR_ERR(skb); | |
694 | bt_dev_err(hdev, "Failed to apply low power setting (%d)", err); | |
695 | return err; | |
696 | } | |
697 | kfree_skb(skb); | |
698 | ||
699 | rettime = ktime_get(); | |
700 | delta = ktime_sub(rettime, calltime); | |
701 | duration = (unsigned long long)ktime_to_ns(delta) >> 10; | |
702 | ||
703 | bt_dev_info(hdev, "Device setup in %llu usecs", duration); | |
704 | ||
7237c4c9 SW |
705 | return 0; |
706 | } | |
707 | ||
708 | static int btmtkuart_shutdown(struct hci_dev *hdev) | |
709 | { | |
88e5f366 | 710 | struct btmtk_hci_wmt_params wmt_params; |
7237c4c9 SW |
711 | u8 param = 0x0; |
712 | int err; | |
713 | ||
714 | /* Disable the device */ | |
f5c3f989 | 715 | wmt_params.op = BTMTK_WMT_FUNC_CTRL; |
88e5f366 SW |
716 | wmt_params.flag = 0; |
717 | wmt_params.dlen = sizeof(param); | |
718 | wmt_params.data = ¶m; | |
719 | wmt_params.status = NULL; | |
720 | ||
721 | err = mtk_hci_wmt_sync(hdev, &wmt_params); | |
7237c4c9 SW |
722 | if (err < 0) { |
723 | bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); | |
724 | return err; | |
725 | } | |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
730 | static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) | |
731 | { | |
732 | struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); | |
733 | struct mtk_stp_hdr *shdr; | |
734 | int err, dlen, type = 0; | |
735 | ||
736 | /* Prepend skb with frame type */ | |
737 | memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); | |
738 | ||
739 | /* Make sure that there is enough rooms for STP header and trailer */ | |
740 | if (unlikely(skb_headroom(skb) < sizeof(*shdr)) || | |
741 | (skb_tailroom(skb) < MTK_STP_TLR_SIZE)) { | |
742 | err = pskb_expand_head(skb, sizeof(*shdr), MTK_STP_TLR_SIZE, | |
743 | GFP_ATOMIC); | |
744 | if (err < 0) | |
745 | return err; | |
746 | } | |
747 | ||
748 | /* Add the STP header */ | |
749 | dlen = skb->len; | |
750 | shdr = skb_push(skb, sizeof(*shdr)); | |
751 | shdr->prefix = 0x80; | |
752 | shdr->dlen = cpu_to_be16((dlen & 0x0fff) | (type << 12)); | |
753 | shdr->cs = 0; /* MT7622 doesn't care about checksum value */ | |
754 | ||
755 | /* Add the STP trailer */ | |
756 | skb_put_zero(skb, MTK_STP_TLR_SIZE); | |
757 | ||
758 | skb_queue_tail(&bdev->txq, skb); | |
759 | ||
760 | btmtkuart_tx_wakeup(bdev); | |
761 | return 0; | |
762 | } | |
763 | ||
22eaf6c9 SW |
764 | static int btmtkuart_parse_dt(struct serdev_device *serdev) |
765 | { | |
766 | struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); | |
767 | struct device_node *node = serdev->dev.of_node; | |
768 | u32 speed = 921600; | |
769 | int err; | |
770 | ||
771 | if (btmtkuart_is_standalone(bdev)) { | |
772 | of_property_read_u32(node, "current-speed", &speed); | |
773 | ||
774 | bdev->desired_speed = speed; | |
775 | ||
776 | bdev->vcc = devm_regulator_get(&serdev->dev, "vcc"); | |
777 | if (IS_ERR(bdev->vcc)) { | |
778 | err = PTR_ERR(bdev->vcc); | |
779 | return err; | |
780 | } | |
781 | ||
05582561 SW |
782 | bdev->osc = devm_clk_get_optional(&serdev->dev, "osc"); |
783 | if (IS_ERR(bdev->osc)) { | |
784 | err = PTR_ERR(bdev->osc); | |
785 | return err; | |
786 | } | |
787 | ||
a3cb6d60 SW |
788 | bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot", |
789 | GPIOD_OUT_LOW); | |
790 | if (IS_ERR(bdev->boot)) { | |
791 | err = PTR_ERR(bdev->boot); | |
792 | return err; | |
793 | } | |
794 | ||
22eaf6c9 SW |
795 | bdev->pinctrl = devm_pinctrl_get(&serdev->dev); |
796 | if (IS_ERR(bdev->pinctrl)) { | |
797 | err = PTR_ERR(bdev->pinctrl); | |
798 | return err; | |
799 | } | |
800 | ||
801 | bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl, | |
802 | "default"); | |
a3cb6d60 | 803 | if (IS_ERR(bdev->pins_boot) && !bdev->boot) { |
22eaf6c9 | 804 | err = PTR_ERR(bdev->pins_boot); |
a3cb6d60 SW |
805 | dev_err(&serdev->dev, |
806 | "Should assign RXD to LOW at boot stage\n"); | |
22eaf6c9 SW |
807 | return err; |
808 | } | |
809 | ||
810 | bdev->pins_runtime = pinctrl_lookup_state(bdev->pinctrl, | |
811 | "runtime"); | |
812 | if (IS_ERR(bdev->pins_runtime)) { | |
813 | err = PTR_ERR(bdev->pins_runtime); | |
814 | return err; | |
815 | } | |
816 | ||
817 | bdev->reset = devm_gpiod_get_optional(&serdev->dev, "reset", | |
818 | GPIOD_OUT_LOW); | |
819 | if (IS_ERR(bdev->reset)) { | |
820 | err = PTR_ERR(bdev->reset); | |
821 | return err; | |
822 | } | |
823 | } else if (btmtkuart_is_builtin_soc(bdev)) { | |
824 | bdev->clk = devm_clk_get(&serdev->dev, "ref"); | |
825 | if (IS_ERR(bdev->clk)) | |
826 | return PTR_ERR(bdev->clk); | |
827 | } | |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
7237c4c9 SW |
832 | static int btmtkuart_probe(struct serdev_device *serdev) |
833 | { | |
834 | struct btmtkuart_dev *bdev; | |
835 | struct hci_dev *hdev; | |
22eaf6c9 | 836 | int err; |
7237c4c9 SW |
837 | |
838 | bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL); | |
839 | if (!bdev) | |
840 | return -ENOMEM; | |
841 | ||
22eaf6c9 SW |
842 | bdev->data = of_device_get_match_data(&serdev->dev); |
843 | if (!bdev->data) | |
844 | return -ENODEV; | |
7237c4c9 SW |
845 | |
846 | bdev->serdev = serdev; | |
847 | serdev_device_set_drvdata(serdev, bdev); | |
848 | ||
849 | serdev_device_set_client_ops(serdev, &btmtkuart_client_ops); | |
850 | ||
22eaf6c9 SW |
851 | err = btmtkuart_parse_dt(serdev); |
852 | if (err < 0) | |
853 | return err; | |
854 | ||
7237c4c9 SW |
855 | INIT_WORK(&bdev->tx_work, btmtkuart_tx_work); |
856 | skb_queue_head_init(&bdev->txq); | |
857 | ||
858 | /* Initialize and register HCI device */ | |
859 | hdev = hci_alloc_dev(); | |
860 | if (!hdev) { | |
861 | dev_err(&serdev->dev, "Can't allocate HCI device\n"); | |
862 | return -ENOMEM; | |
863 | } | |
864 | ||
865 | bdev->hdev = hdev; | |
866 | ||
867 | hdev->bus = HCI_UART; | |
868 | hci_set_drvdata(hdev, bdev); | |
869 | ||
870 | hdev->open = btmtkuart_open; | |
871 | hdev->close = btmtkuart_close; | |
872 | hdev->flush = btmtkuart_flush; | |
873 | hdev->setup = btmtkuart_setup; | |
874 | hdev->shutdown = btmtkuart_shutdown; | |
875 | hdev->send = btmtkuart_send_frame; | |
3640e7f4 | 876 | hdev->set_bdaddr = btmtk_set_bdaddr; |
7237c4c9 SW |
877 | SET_HCIDEV_DEV(hdev, &serdev->dev); |
878 | ||
879 | hdev->manufacturer = 70; | |
880 | set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); | |
881 | ||
22eaf6c9 | 882 | if (btmtkuart_is_standalone(bdev)) { |
05582561 SW |
883 | err = clk_prepare_enable(bdev->osc); |
884 | if (err < 0) | |
4803c54c | 885 | goto err_hci_free_dev; |
05582561 | 886 | |
a3cb6d60 SW |
887 | if (bdev->boot) { |
888 | gpiod_set_value_cansleep(bdev->boot, 1); | |
889 | } else { | |
890 | /* Switch to the specific pin state for the booting | |
891 | * requires. | |
892 | */ | |
893 | pinctrl_select_state(bdev->pinctrl, bdev->pins_boot); | |
894 | } | |
22eaf6c9 SW |
895 | |
896 | /* Power on */ | |
897 | err = regulator_enable(bdev->vcc); | |
4803c54c CY |
898 | if (err < 0) |
899 | goto err_clk_disable_unprepare; | |
22eaf6c9 SW |
900 | |
901 | /* Reset if the reset-gpios is available otherwise the board | |
902 | * -level design should be guaranteed. | |
903 | */ | |
904 | if (bdev->reset) { | |
905 | gpiod_set_value_cansleep(bdev->reset, 1); | |
906 | usleep_range(1000, 2000); | |
907 | gpiod_set_value_cansleep(bdev->reset, 0); | |
908 | } | |
909 | ||
910 | /* Wait some time until device got ready and switch to the pin | |
911 | * mode the device requires for UART transfers. | |
912 | */ | |
913 | msleep(50); | |
a3cb6d60 SW |
914 | |
915 | if (bdev->boot) | |
916 | devm_gpiod_put(&serdev->dev, bdev->boot); | |
917 | ||
22eaf6c9 SW |
918 | pinctrl_select_state(bdev->pinctrl, bdev->pins_runtime); |
919 | ||
920 | /* A standalone device doesn't depends on power domain on SoC, | |
921 | * so mark it as no callbacks. | |
922 | */ | |
923 | pm_runtime_no_callbacks(&serdev->dev); | |
924 | ||
925 | set_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state); | |
926 | } | |
927 | ||
928 | err = hci_register_dev(hdev); | |
929 | if (err < 0) { | |
7237c4c9 | 930 | dev_err(&serdev->dev, "Can't register HCI device\n"); |
22eaf6c9 | 931 | goto err_regulator_disable; |
7237c4c9 SW |
932 | } |
933 | ||
934 | return 0; | |
22eaf6c9 SW |
935 | |
936 | err_regulator_disable: | |
a3cb6d60 | 937 | if (btmtkuart_is_standalone(bdev)) |
22eaf6c9 | 938 | regulator_disable(bdev->vcc); |
4803c54c CY |
939 | err_clk_disable_unprepare: |
940 | if (btmtkuart_is_standalone(bdev)) | |
941 | clk_disable_unprepare(bdev->osc); | |
942 | err_hci_free_dev: | |
943 | hci_free_dev(hdev); | |
22eaf6c9 SW |
944 | |
945 | return err; | |
7237c4c9 SW |
946 | } |
947 | ||
948 | static void btmtkuart_remove(struct serdev_device *serdev) | |
949 | { | |
950 | struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); | |
951 | struct hci_dev *hdev = bdev->hdev; | |
952 | ||
05582561 | 953 | if (btmtkuart_is_standalone(bdev)) { |
22eaf6c9 | 954 | regulator_disable(bdev->vcc); |
05582561 SW |
955 | clk_disable_unprepare(bdev->osc); |
956 | } | |
22eaf6c9 | 957 | |
7237c4c9 SW |
958 | hci_unregister_dev(hdev); |
959 | hci_free_dev(hdev); | |
960 | } | |
961 | ||
22eaf6c9 SW |
962 | static const struct btmtkuart_data mt7622_data = { |
963 | .fwname = FIRMWARE_MT7622, | |
964 | }; | |
965 | ||
966 | static const struct btmtkuart_data mt7663_data = { | |
967 | .flags = BTMTKUART_FLAG_STANDALONE_HW, | |
968 | .fwname = FIRMWARE_MT7663, | |
969 | }; | |
970 | ||
971 | static const struct btmtkuart_data mt7668_data = { | |
972 | .flags = BTMTKUART_FLAG_STANDALONE_HW, | |
973 | .fwname = FIRMWARE_MT7668, | |
974 | }; | |
975 | ||
7237c4c9 SW |
976 | #ifdef CONFIG_OF |
977 | static const struct of_device_id mtk_of_match_table[] = { | |
22eaf6c9 SW |
978 | { .compatible = "mediatek,mt7622-bluetooth", .data = &mt7622_data}, |
979 | { .compatible = "mediatek,mt7663u-bluetooth", .data = &mt7663_data}, | |
980 | { .compatible = "mediatek,mt7668u-bluetooth", .data = &mt7668_data}, | |
7237c4c9 SW |
981 | { } |
982 | }; | |
983 | MODULE_DEVICE_TABLE(of, mtk_of_match_table); | |
984 | #endif | |
985 | ||
986 | static struct serdev_device_driver btmtkuart_driver = { | |
987 | .probe = btmtkuart_probe, | |
988 | .remove = btmtkuart_remove, | |
989 | .driver = { | |
990 | .name = "btmtkuart", | |
991 | .of_match_table = of_match_ptr(mtk_of_match_table), | |
992 | }, | |
993 | }; | |
994 | ||
995 | module_serdev_device_driver(btmtkuart_driver); | |
996 | ||
997 | MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>"); | |
998 | MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION); | |
999 | MODULE_VERSION(VERSION); | |
1000 | MODULE_LICENSE("GPL"); |