1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Bluetooth HCI UART driver for marvell devices
6 * Copyright (C) 2016 Marvell International Ltd.
7 * Copyright (C) 2016 Intel Corporation
10 #include <linux/kernel.h>
11 #include <linux/errno.h>
12 #include <linux/skbuff.h>
13 #include <linux/firmware.h>
14 #include <linux/module.h>
15 #include <linux/tty.h>
17 #include <linux/serdev.h>
19 #include <net/bluetooth/bluetooth.h>
20 #include <net/bluetooth/hci_core.h>
24 #define HCI_FW_REQ_PKT 0xA5
25 #define HCI_CHIP_VER_PKT 0xAA
29 #define MRVL_RAW_DATA 0x1F
30 #define MRVL_SET_BAUDRATE 0xFC09
33 STATE_CHIP_VER_PENDING,
39 struct sk_buff *rx_skb;
40 struct sk_buff_head txq;
41 struct sk_buff_head rawq;
55 #define HCI_MRVL_PKT_SIZE 4
57 static int mrvl_open(struct hci_uart *hu)
59 struct mrvl_data *mrvl;
64 if (!hci_uart_has_flow_control(hu))
67 mrvl = kzalloc(sizeof(*mrvl), GFP_KERNEL);
71 skb_queue_head_init(&mrvl->txq);
72 skb_queue_head_init(&mrvl->rawq);
74 set_bit(STATE_CHIP_VER_PENDING, &mrvl->flags);
79 ret = serdev_device_open(hu->serdev);
91 static int mrvl_close(struct hci_uart *hu)
93 struct mrvl_data *mrvl = hu->priv;
98 serdev_device_close(hu->serdev);
100 skb_queue_purge(&mrvl->txq);
101 skb_queue_purge(&mrvl->rawq);
102 kfree_skb(mrvl->rx_skb);
109 static int mrvl_flush(struct hci_uart *hu)
111 struct mrvl_data *mrvl = hu->priv;
115 skb_queue_purge(&mrvl->txq);
116 skb_queue_purge(&mrvl->rawq);
121 static struct sk_buff *mrvl_dequeue(struct hci_uart *hu)
123 struct mrvl_data *mrvl = hu->priv;
126 skb = skb_dequeue(&mrvl->txq);
129 skb = skb_dequeue(&mrvl->rawq);
131 /* Prepend skb with frame type */
132 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
138 static int mrvl_enqueue(struct hci_uart *hu, struct sk_buff *skb)
140 struct mrvl_data *mrvl = hu->priv;
142 skb_queue_tail(&mrvl->txq, skb);
146 static void mrvl_send_ack(struct hci_uart *hu, unsigned char type)
148 struct mrvl_data *mrvl = hu->priv;
151 /* No H4 payload, only 1 byte header */
152 skb = bt_skb_alloc(0, GFP_ATOMIC);
154 bt_dev_err(hu->hdev, "Unable to alloc ack/nak packet");
157 hci_skb_pkt_type(skb) = type;
159 skb_queue_tail(&mrvl->txq, skb);
160 hci_uart_tx_wakeup(hu);
163 static int mrvl_recv_fw_req(struct hci_dev *hdev, struct sk_buff *skb)
165 struct hci_mrvl_pkt *pkt = (void *)skb->data;
166 struct hci_uart *hu = hci_get_drvdata(hdev);
167 struct mrvl_data *mrvl = hu->priv;
170 if ((pkt->lhs ^ pkt->rhs) != 0xffff) {
171 bt_dev_err(hdev, "Corrupted mrvl header");
172 mrvl_send_ack(hu, MRVL_NAK);
176 mrvl_send_ack(hu, MRVL_ACK);
178 if (!test_bit(STATE_FW_REQ_PENDING, &mrvl->flags)) {
179 bt_dev_err(hdev, "Received unexpected firmware request");
184 mrvl->tx_len = le16_to_cpu(pkt->lhs);
186 clear_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
187 smp_mb__after_atomic();
188 wake_up_bit(&mrvl->flags, STATE_FW_REQ_PENDING);
195 static int mrvl_recv_chip_ver(struct hci_dev *hdev, struct sk_buff *skb)
197 struct hci_mrvl_pkt *pkt = (void *)skb->data;
198 struct hci_uart *hu = hci_get_drvdata(hdev);
199 struct mrvl_data *mrvl = hu->priv;
200 u16 version = le16_to_cpu(pkt->lhs);
203 if ((pkt->lhs ^ pkt->rhs) != 0xffff) {
204 bt_dev_err(hdev, "Corrupted mrvl header");
205 mrvl_send_ack(hu, MRVL_NAK);
209 mrvl_send_ack(hu, MRVL_ACK);
211 if (!test_bit(STATE_CHIP_VER_PENDING, &mrvl->flags)) {
212 bt_dev_err(hdev, "Received unexpected chip version");
217 mrvl->rev = version >> 8;
219 bt_dev_info(hdev, "Controller id = %x, rev = %x", mrvl->id, mrvl->rev);
221 clear_bit(STATE_CHIP_VER_PENDING, &mrvl->flags);
222 smp_mb__after_atomic();
223 wake_up_bit(&mrvl->flags, STATE_CHIP_VER_PENDING);
230 #define HCI_RECV_CHIP_VER \
231 .type = HCI_CHIP_VER_PKT, \
232 .hlen = HCI_MRVL_PKT_SIZE, \
235 .maxlen = HCI_MRVL_PKT_SIZE
237 #define HCI_RECV_FW_REQ \
238 .type = HCI_FW_REQ_PKT, \
239 .hlen = HCI_MRVL_PKT_SIZE, \
242 .maxlen = HCI_MRVL_PKT_SIZE
244 static const struct h4_recv_pkt mrvl_recv_pkts[] = {
245 { H4_RECV_ACL, .recv = hci_recv_frame },
246 { H4_RECV_SCO, .recv = hci_recv_frame },
247 { H4_RECV_EVENT, .recv = hci_recv_frame },
248 { HCI_RECV_FW_REQ, .recv = mrvl_recv_fw_req },
249 { HCI_RECV_CHIP_VER, .recv = mrvl_recv_chip_ver },
252 static int mrvl_recv(struct hci_uart *hu, const void *data, int count)
254 struct mrvl_data *mrvl = hu->priv;
256 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
259 /* We might receive some noise when there is no firmware loaded. Therefore,
260 * we drop data if the firmware is not loaded yet and if there is no fw load
263 if (!test_bit(STATE_FW_REQ_PENDING, &mrvl->flags) &&
264 !test_bit(STATE_FW_LOADED, &mrvl->flags))
267 mrvl->rx_skb = h4_recv_buf(hu->hdev, mrvl->rx_skb, data, count,
269 ARRAY_SIZE(mrvl_recv_pkts));
270 if (IS_ERR(mrvl->rx_skb)) {
271 int err = PTR_ERR(mrvl->rx_skb);
272 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
280 static int mrvl_load_firmware(struct hci_dev *hdev, const char *name)
282 struct hci_uart *hu = hci_get_drvdata(hdev);
283 struct mrvl_data *mrvl = hu->priv;
284 const struct firmware *fw = NULL;
285 const u8 *fw_ptr, *fw_max;
288 err = request_firmware(&fw, name, &hdev->dev);
290 bt_dev_err(hdev, "Failed to load firmware file %s", name);
295 fw_max = fw->data + fw->size;
297 bt_dev_info(hdev, "Loading %s", name);
299 set_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
301 while (fw_ptr <= fw_max) {
304 /* Controller drives the firmware load by sending firmware
305 * request packets containing the expected fragment size.
307 err = wait_on_bit_timeout(&mrvl->flags, STATE_FW_REQ_PENDING,
309 msecs_to_jiffies(2000));
311 bt_dev_err(hdev, "Firmware load interrupted");
315 bt_dev_err(hdev, "Firmware request timeout");
320 bt_dev_dbg(hdev, "Firmware request, expecting %d bytes",
323 if (fw_ptr == fw_max) {
324 /* Controller requests a null size once firmware is
325 * fully loaded. If controller expects more data, there
329 bt_dev_info(hdev, "Firmware loading complete");
331 bt_dev_err(hdev, "Firmware loading failure");
337 if (fw_ptr + mrvl->tx_len > fw_max) {
338 mrvl->tx_len = fw_max - fw_ptr;
339 bt_dev_dbg(hdev, "Adjusting tx_len to %d",
343 skb = bt_skb_alloc(mrvl->tx_len, GFP_KERNEL);
345 bt_dev_err(hdev, "Failed to alloc mem for FW packet");
349 bt_cb(skb)->pkt_type = MRVL_RAW_DATA;
351 skb_put_data(skb, fw_ptr, mrvl->tx_len);
352 fw_ptr += mrvl->tx_len;
354 set_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
356 skb_queue_tail(&mrvl->rawq, skb);
357 hci_uart_tx_wakeup(hu);
360 release_firmware(fw);
364 static int mrvl_setup(struct hci_uart *hu)
367 struct mrvl_data *mrvl = hu->priv;
369 hci_uart_set_flow_control(hu, true);
371 err = mrvl_load_firmware(hu->hdev, "mrvl/helper_uart_3000000.bin");
373 bt_dev_err(hu->hdev, "Unable to download firmware helper");
377 /* Let the final ack go out before switching the baudrate */
378 hci_uart_wait_until_sent(hu);
381 serdev_device_set_baudrate(hu->serdev, hu->oper_speed);
383 hci_uart_set_baudrate(hu, hu->oper_speed);
385 hci_uart_set_flow_control(hu, false);
387 err = mrvl_load_firmware(hu->hdev, "mrvl/uart8897_bt.bin");
391 set_bit(STATE_FW_LOADED, &mrvl->flags);
396 static int mrvl_set_baudrate(struct hci_uart *hu, unsigned int speed)
399 struct mrvl_data *mrvl = hu->priv;
400 __le32 speed_le = cpu_to_le32(speed);
402 /* The firmware might be loaded by the Wifi driver over SDIO. We wait
403 * up to 10s for the CTS to go up. Afterward, we know that the firmware
406 err = serdev_device_wait_for_cts(hu->serdev, true, 10000);
408 bt_dev_err(hu->hdev, "Wait for CTS failed with %d\n", err);
412 set_bit(STATE_FW_LOADED, &mrvl->flags);
414 err = __hci_cmd_sync_status(hu->hdev, MRVL_SET_BAUDRATE,
415 sizeof(speed_le), &speed_le,
418 bt_dev_err(hu->hdev, "send command failed: %d", err);
422 serdev_device_set_baudrate(hu->serdev, speed);
424 /* We forcefully have to send a command to the bluetooth module so that
425 * the driver detects it after a baudrate change. This is foreseen by
426 * hci_serdev by setting HCI_UART_VND_DETECT which then causes a dummy
427 * local version read.
429 set_bit(HCI_UART_VND_DETECT, &hu->hdev_flags);
434 static const struct hci_uart_proto mrvl_proto_8897 = {
437 .init_speed = 115200,
438 .oper_speed = 3000000,
444 .enqueue = mrvl_enqueue,
445 .dequeue = mrvl_dequeue,
448 static const struct hci_uart_proto mrvl_proto_8997 = {
450 .name = "Marvell 8997",
451 .init_speed = 115200,
452 .oper_speed = 3000000,
456 .set_baudrate = mrvl_set_baudrate,
458 .enqueue = mrvl_enqueue,
459 .dequeue = mrvl_dequeue,
462 static int mrvl_serdev_probe(struct serdev_device *serdev)
464 struct mrvl_serdev *mrvldev;
465 const struct hci_uart_proto *mrvl_proto = device_get_match_data(&serdev->dev);
467 mrvldev = devm_kzalloc(&serdev->dev, sizeof(*mrvldev), GFP_KERNEL);
471 mrvldev->hu.oper_speed = mrvl_proto->oper_speed;
472 if (mrvl_proto->set_baudrate)
473 of_property_read_u32(serdev->dev.of_node, "max-speed", &mrvldev->hu.oper_speed);
475 mrvldev->hu.serdev = serdev;
476 serdev_device_set_drvdata(serdev, mrvldev);
478 return hci_uart_register_device(&mrvldev->hu, mrvl_proto);
481 static void mrvl_serdev_remove(struct serdev_device *serdev)
483 struct mrvl_serdev *mrvldev = serdev_device_get_drvdata(serdev);
485 hci_uart_unregister_device(&mrvldev->hu);
488 static const struct of_device_id __maybe_unused mrvl_bluetooth_of_match[] = {
489 { .compatible = "mrvl,88w8897", .data = &mrvl_proto_8897},
490 { .compatible = "mrvl,88w8997", .data = &mrvl_proto_8997},
493 MODULE_DEVICE_TABLE(of, mrvl_bluetooth_of_match);
495 static struct serdev_device_driver mrvl_serdev_driver = {
496 .probe = mrvl_serdev_probe,
497 .remove = mrvl_serdev_remove,
499 .name = "hci_uart_mrvl",
500 .of_match_table = of_match_ptr(mrvl_bluetooth_of_match),
504 int __init mrvl_init(void)
506 serdev_device_driver_register(&mrvl_serdev_driver);
508 return hci_uart_register_proto(&mrvl_proto_8897);
511 int __exit mrvl_deinit(void)
513 serdev_device_driver_unregister(&mrvl_serdev_driver);
515 return hci_uart_unregister_proto(&mrvl_proto_8897);