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
32 STATE_CHIP_VER_PENDING,
37 struct sk_buff *rx_skb;
38 struct sk_buff_head txq;
39 struct sk_buff_head rawq;
53 #define HCI_MRVL_PKT_SIZE 4
55 static int mrvl_open(struct hci_uart *hu)
57 struct mrvl_data *mrvl;
62 if (!hci_uart_has_flow_control(hu))
65 mrvl = kzalloc(sizeof(*mrvl), GFP_KERNEL);
69 skb_queue_head_init(&mrvl->txq);
70 skb_queue_head_init(&mrvl->rawq);
72 set_bit(STATE_CHIP_VER_PENDING, &mrvl->flags);
77 ret = serdev_device_open(hu->serdev);
89 static int mrvl_close(struct hci_uart *hu)
91 struct mrvl_data *mrvl = hu->priv;
96 serdev_device_close(hu->serdev);
98 skb_queue_purge(&mrvl->txq);
99 skb_queue_purge(&mrvl->rawq);
100 kfree_skb(mrvl->rx_skb);
107 static int mrvl_flush(struct hci_uart *hu)
109 struct mrvl_data *mrvl = hu->priv;
113 skb_queue_purge(&mrvl->txq);
114 skb_queue_purge(&mrvl->rawq);
119 static struct sk_buff *mrvl_dequeue(struct hci_uart *hu)
121 struct mrvl_data *mrvl = hu->priv;
124 skb = skb_dequeue(&mrvl->txq);
127 skb = skb_dequeue(&mrvl->rawq);
129 /* Prepend skb with frame type */
130 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
136 static int mrvl_enqueue(struct hci_uart *hu, struct sk_buff *skb)
138 struct mrvl_data *mrvl = hu->priv;
140 skb_queue_tail(&mrvl->txq, skb);
144 static void mrvl_send_ack(struct hci_uart *hu, unsigned char type)
146 struct mrvl_data *mrvl = hu->priv;
149 /* No H4 payload, only 1 byte header */
150 skb = bt_skb_alloc(0, GFP_ATOMIC);
152 bt_dev_err(hu->hdev, "Unable to alloc ack/nak packet");
155 hci_skb_pkt_type(skb) = type;
157 skb_queue_tail(&mrvl->txq, skb);
158 hci_uart_tx_wakeup(hu);
161 static int mrvl_recv_fw_req(struct hci_dev *hdev, struct sk_buff *skb)
163 struct hci_mrvl_pkt *pkt = (void *)skb->data;
164 struct hci_uart *hu = hci_get_drvdata(hdev);
165 struct mrvl_data *mrvl = hu->priv;
168 if ((pkt->lhs ^ pkt->rhs) != 0xffff) {
169 bt_dev_err(hdev, "Corrupted mrvl header");
170 mrvl_send_ack(hu, MRVL_NAK);
174 mrvl_send_ack(hu, MRVL_ACK);
176 if (!test_bit(STATE_FW_REQ_PENDING, &mrvl->flags)) {
177 bt_dev_err(hdev, "Received unexpected firmware request");
182 mrvl->tx_len = le16_to_cpu(pkt->lhs);
184 clear_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
185 smp_mb__after_atomic();
186 wake_up_bit(&mrvl->flags, STATE_FW_REQ_PENDING);
193 static int mrvl_recv_chip_ver(struct hci_dev *hdev, struct sk_buff *skb)
195 struct hci_mrvl_pkt *pkt = (void *)skb->data;
196 struct hci_uart *hu = hci_get_drvdata(hdev);
197 struct mrvl_data *mrvl = hu->priv;
198 u16 version = le16_to_cpu(pkt->lhs);
201 if ((pkt->lhs ^ pkt->rhs) != 0xffff) {
202 bt_dev_err(hdev, "Corrupted mrvl header");
203 mrvl_send_ack(hu, MRVL_NAK);
207 mrvl_send_ack(hu, MRVL_ACK);
209 if (!test_bit(STATE_CHIP_VER_PENDING, &mrvl->flags)) {
210 bt_dev_err(hdev, "Received unexpected chip version");
215 mrvl->rev = version >> 8;
217 bt_dev_info(hdev, "Controller id = %x, rev = %x", mrvl->id, mrvl->rev);
219 clear_bit(STATE_CHIP_VER_PENDING, &mrvl->flags);
220 smp_mb__after_atomic();
221 wake_up_bit(&mrvl->flags, STATE_CHIP_VER_PENDING);
228 #define HCI_RECV_CHIP_VER \
229 .type = HCI_CHIP_VER_PKT, \
230 .hlen = HCI_MRVL_PKT_SIZE, \
233 .maxlen = HCI_MRVL_PKT_SIZE
235 #define HCI_RECV_FW_REQ \
236 .type = HCI_FW_REQ_PKT, \
237 .hlen = HCI_MRVL_PKT_SIZE, \
240 .maxlen = HCI_MRVL_PKT_SIZE
242 static const struct h4_recv_pkt mrvl_recv_pkts[] = {
243 { H4_RECV_ACL, .recv = hci_recv_frame },
244 { H4_RECV_SCO, .recv = hci_recv_frame },
245 { H4_RECV_EVENT, .recv = hci_recv_frame },
246 { HCI_RECV_FW_REQ, .recv = mrvl_recv_fw_req },
247 { HCI_RECV_CHIP_VER, .recv = mrvl_recv_chip_ver },
250 static int mrvl_recv(struct hci_uart *hu, const void *data, int count)
252 struct mrvl_data *mrvl = hu->priv;
254 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
257 mrvl->rx_skb = h4_recv_buf(hu->hdev, mrvl->rx_skb, data, count,
259 ARRAY_SIZE(mrvl_recv_pkts));
260 if (IS_ERR(mrvl->rx_skb)) {
261 int err = PTR_ERR(mrvl->rx_skb);
262 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
270 static int mrvl_load_firmware(struct hci_dev *hdev, const char *name)
272 struct hci_uart *hu = hci_get_drvdata(hdev);
273 struct mrvl_data *mrvl = hu->priv;
274 const struct firmware *fw = NULL;
275 const u8 *fw_ptr, *fw_max;
278 err = request_firmware(&fw, name, &hdev->dev);
280 bt_dev_err(hdev, "Failed to load firmware file %s", name);
285 fw_max = fw->data + fw->size;
287 bt_dev_info(hdev, "Loading %s", name);
289 set_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
291 while (fw_ptr <= fw_max) {
294 /* Controller drives the firmware load by sending firmware
295 * request packets containing the expected fragment size.
297 err = wait_on_bit_timeout(&mrvl->flags, STATE_FW_REQ_PENDING,
299 msecs_to_jiffies(2000));
301 bt_dev_err(hdev, "Firmware load interrupted");
305 bt_dev_err(hdev, "Firmware request timeout");
310 bt_dev_dbg(hdev, "Firmware request, expecting %d bytes",
313 if (fw_ptr == fw_max) {
314 /* Controller requests a null size once firmware is
315 * fully loaded. If controller expects more data, there
319 bt_dev_info(hdev, "Firmware loading complete");
321 bt_dev_err(hdev, "Firmware loading failure");
327 if (fw_ptr + mrvl->tx_len > fw_max) {
328 mrvl->tx_len = fw_max - fw_ptr;
329 bt_dev_dbg(hdev, "Adjusting tx_len to %d",
333 skb = bt_skb_alloc(mrvl->tx_len, GFP_KERNEL);
335 bt_dev_err(hdev, "Failed to alloc mem for FW packet");
339 bt_cb(skb)->pkt_type = MRVL_RAW_DATA;
341 skb_put_data(skb, fw_ptr, mrvl->tx_len);
342 fw_ptr += mrvl->tx_len;
344 set_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
346 skb_queue_tail(&mrvl->rawq, skb);
347 hci_uart_tx_wakeup(hu);
350 release_firmware(fw);
354 static int mrvl_setup(struct hci_uart *hu)
358 hci_uart_set_flow_control(hu, true);
360 err = mrvl_load_firmware(hu->hdev, "mrvl/helper_uart_3000000.bin");
362 bt_dev_err(hu->hdev, "Unable to download firmware helper");
366 /* Let the final ack go out before switching the baudrate */
367 hci_uart_wait_until_sent(hu);
370 serdev_device_set_baudrate(hu->serdev, 3000000);
372 hci_uart_set_baudrate(hu, 3000000);
374 hci_uart_set_flow_control(hu, false);
376 err = mrvl_load_firmware(hu->hdev, "mrvl/uart8897_bt.bin");
383 static const struct hci_uart_proto mrvl_proto = {
386 .init_speed = 115200,
392 .enqueue = mrvl_enqueue,
393 .dequeue = mrvl_dequeue,
396 static int mrvl_serdev_probe(struct serdev_device *serdev)
398 struct mrvl_serdev *mrvldev;
400 mrvldev = devm_kzalloc(&serdev->dev, sizeof(*mrvldev), GFP_KERNEL);
404 mrvldev->hu.serdev = serdev;
405 serdev_device_set_drvdata(serdev, mrvldev);
407 return hci_uart_register_device(&mrvldev->hu, &mrvl_proto);
410 static void mrvl_serdev_remove(struct serdev_device *serdev)
412 struct mrvl_serdev *mrvldev = serdev_device_get_drvdata(serdev);
414 hci_uart_unregister_device(&mrvldev->hu);
418 static const struct of_device_id mrvl_bluetooth_of_match[] = {
419 { .compatible = "mrvl,88w8897" },
422 MODULE_DEVICE_TABLE(of, mrvl_bluetooth_of_match);
425 static struct serdev_device_driver mrvl_serdev_driver = {
426 .probe = mrvl_serdev_probe,
427 .remove = mrvl_serdev_remove,
429 .name = "hci_uart_mrvl",
430 .of_match_table = of_match_ptr(mrvl_bluetooth_of_match),
434 int __init mrvl_init(void)
436 serdev_device_driver_register(&mrvl_serdev_driver);
438 return hci_uart_register_proto(&mrvl_proto);
441 int __exit mrvl_deinit(void)
443 serdev_device_driver_unregister(&mrvl_serdev_driver);
445 return hci_uart_unregister_proto(&mrvl_proto);