3 * Bluetooth HCI UART driver for Intel devices
5 * Copyright (C) 2015 Intel Corporation
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <linux/kernel.h>
25 #include <linux/errno.h>
26 #include <linux/skbuff.h>
27 #include <linux/firmware.h>
28 #include <linux/wait.h>
30 #include <net/bluetooth/bluetooth.h>
31 #include <net/bluetooth/hci_core.h>
36 #define STATE_BOOTLOADER 0
37 #define STATE_DOWNLOADING 1
38 #define STATE_FIRMWARE_LOADED 2
39 #define STATE_FIRMWARE_FAILED 3
40 #define STATE_BOOTING 4
43 struct sk_buff *rx_skb;
44 struct sk_buff_head txq;
48 static int intel_open(struct hci_uart *hu)
50 struct intel_data *intel;
54 intel = kzalloc(sizeof(*intel), GFP_KERNEL);
58 skb_queue_head_init(&intel->txq);
64 static int intel_close(struct hci_uart *hu)
66 struct intel_data *intel = hu->priv;
70 skb_queue_purge(&intel->txq);
71 kfree_skb(intel->rx_skb);
78 static int intel_flush(struct hci_uart *hu)
80 struct intel_data *intel = hu->priv;
84 skb_queue_purge(&intel->txq);
89 static int inject_cmd_complete(struct hci_dev *hdev, __u16 opcode)
92 struct hci_event_hdr *hdr;
93 struct hci_ev_cmd_complete *evt;
95 skb = bt_skb_alloc(sizeof(*hdr) + sizeof(*evt) + 1, GFP_ATOMIC);
99 hdr = (struct hci_event_hdr *)skb_put(skb, sizeof(*hdr));
100 hdr->evt = HCI_EV_CMD_COMPLETE;
101 hdr->plen = sizeof(*evt) + 1;
103 evt = (struct hci_ev_cmd_complete *)skb_put(skb, sizeof(*evt));
105 evt->opcode = cpu_to_le16(opcode);
107 *skb_put(skb, 1) = 0x00;
109 bt_cb(skb)->pkt_type = HCI_EVENT_PKT;
111 return hci_recv_frame(hdev, skb);
114 static int intel_secure_send(struct hci_dev *hdev, u8 fragment_type,
115 u32 plen, const void *param)
119 u8 cmd_param[253], fragment_len = (plen > 252) ? 252 : plen;
121 cmd_param[0] = fragment_type;
122 memcpy(cmd_param + 1, param, fragment_len);
124 skb = __hci_cmd_sync(hdev, 0xfc09, fragment_len + 1,
125 cmd_param, HCI_INIT_TIMEOUT);
131 plen -= fragment_len;
132 param += fragment_len;
138 static void intel_version_info(struct hci_dev *hdev,
139 struct intel_version *ver)
143 switch (ver->fw_variant) {
145 variant = "Bootloader";
148 variant = "Firmware";
154 BT_INFO("%s: %s revision %u.%u build %u week %u %u", hdev->name,
155 variant, ver->fw_revision >> 4, ver->fw_revision & 0x0f,
156 ver->fw_build_num, ver->fw_build_ww, 2000 + ver->fw_build_yy);
159 static int intel_setup(struct hci_uart *hu)
161 static const u8 reset_param[] = { 0x00, 0x01, 0x00, 0x01,
162 0x00, 0x08, 0x04, 0x00 };
163 struct intel_data *intel = hu->priv;
164 struct hci_dev *hdev = hu->hdev;
166 struct intel_version *ver;
167 struct intel_boot_params *params;
168 const struct firmware *fw;
172 ktime_t calltime, delta, rettime;
173 unsigned long long duration;
176 BT_DBG("%s", hdev->name);
178 hu->hdev->set_bdaddr = btintel_set_bdaddr;
180 calltime = ktime_get();
182 set_bit(STATE_BOOTLOADER, &intel->flags);
184 /* Read the Intel version information to determine if the device
185 * is in bootloader mode or if it already has operational firmware
188 skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_INIT_TIMEOUT);
190 BT_ERR("%s: Reading Intel version information failed (%ld)",
191 hdev->name, PTR_ERR(skb));
195 if (skb->len != sizeof(*ver)) {
196 BT_ERR("%s: Intel version event size mismatch", hdev->name);
201 ver = (struct intel_version *)skb->data;
203 BT_ERR("%s: Intel version command failure (%02x)",
204 hdev->name, ver->status);
205 err = -bt_to_errno(ver->status);
210 /* The hardware platform number has a fixed value of 0x37 and
211 * for now only accept this single value.
213 if (ver->hw_platform != 0x37) {
214 BT_ERR("%s: Unsupported Intel hardware platform (%u)",
215 hdev->name, ver->hw_platform);
220 /* At the moment only the hardware variant iBT 3.0 (LnP/SfP) is
221 * supported by this firmware loading method. This check has been
222 * put in place to ensure correct forward compatibility options
223 * when newer hardware variants come along.
225 if (ver->hw_variant != 0x0b) {
226 BT_ERR("%s: Unsupported Intel hardware variant (%u)",
227 hdev->name, ver->hw_variant);
232 intel_version_info(hdev, ver);
234 /* The firmware variant determines if the device is in bootloader
235 * mode or is running operational firmware. The value 0x06 identifies
236 * the bootloader and the value 0x23 identifies the operational
239 * When the operational firmware is already present, then only
240 * the check for valid Bluetooth device address is needed. This
241 * determines if the device will be added as configured or
242 * unconfigured controller.
244 * It is not possible to use the Secure Boot Parameters in this
245 * case since that command is only available in bootloader mode.
247 if (ver->fw_variant == 0x23) {
249 clear_bit(STATE_BOOTLOADER, &intel->flags);
250 btintel_check_bdaddr(hdev);
254 /* If the device is not in bootloader mode, then the only possible
255 * choice is to return an error and abort the device initialization.
257 if (ver->fw_variant != 0x06) {
258 BT_ERR("%s: Unsupported Intel firmware variant (%u)",
259 hdev->name, ver->fw_variant);
266 /* Read the secure boot parameters to identify the operating
267 * details of the bootloader.
269 skb = __hci_cmd_sync(hdev, 0xfc0d, 0, NULL, HCI_INIT_TIMEOUT);
271 BT_ERR("%s: Reading Intel boot parameters failed (%ld)",
272 hdev->name, PTR_ERR(skb));
276 if (skb->len != sizeof(*params)) {
277 BT_ERR("%s: Intel boot parameters size mismatch", hdev->name);
282 params = (struct intel_boot_params *)skb->data;
283 if (params->status) {
284 BT_ERR("%s: Intel boot parameters command failure (%02x)",
285 hdev->name, params->status);
286 err = -bt_to_errno(params->status);
291 BT_INFO("%s: Device revision is %u", hdev->name,
292 le16_to_cpu(params->dev_revid));
294 BT_INFO("%s: Secure boot is %s", hdev->name,
295 params->secure_boot ? "enabled" : "disabled");
297 BT_INFO("%s: Minimum firmware build %u week %u %u", hdev->name,
298 params->min_fw_build_nn, params->min_fw_build_cw,
299 2000 + params->min_fw_build_yy);
301 /* It is required that every single firmware fragment is acknowledged
302 * with a command complete event. If the boot parameters indicate
303 * that this bootloader does not send them, then abort the setup.
305 if (params->limited_cce != 0x00) {
306 BT_ERR("%s: Unsupported Intel firmware loading method (%u)",
307 hdev->name, params->limited_cce);
312 /* If the OTP has no valid Bluetooth device address, then there will
313 * also be no valid address for the operational firmware.
315 if (!bacmp(¶ms->otp_bdaddr, BDADDR_ANY)) {
316 BT_INFO("%s: No device address configured", hdev->name);
317 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
320 /* With this Intel bootloader only the hardware variant and device
321 * revision information are used to select the right firmware.
323 * Currently this bootloader support is limited to hardware variant
324 * iBT 3.0 (LnP/SfP) which is identified by the value 11 (0x0b).
326 snprintf(fwname, sizeof(fwname), "intel/ibt-11-%u.sfi",
327 le16_to_cpu(params->dev_revid));
329 err = request_firmware(&fw, fwname, &hdev->dev);
331 BT_ERR("%s: Failed to load Intel firmware file (%d)",
337 BT_INFO("%s: Found device firmware: %s", hdev->name, fwname);
341 if (fw->size < 644) {
342 BT_ERR("%s: Invalid size of firmware file (%zu)",
343 hdev->name, fw->size);
348 set_bit(STATE_DOWNLOADING, &intel->flags);
350 /* Start the firmware download transaction with the Init fragment
351 * represented by the 128 bytes of CSS header.
353 err = intel_secure_send(hdev, 0x00, 128, fw->data);
355 BT_ERR("%s: Failed to send firmware header (%d)",
360 /* Send the 256 bytes of public key information from the firmware
361 * as the PKey fragment.
363 err = intel_secure_send(hdev, 0x03, 256, fw->data + 128);
365 BT_ERR("%s: Failed to send firmware public key (%d)",
370 /* Send the 256 bytes of signature information from the firmware
371 * as the Sign fragment.
373 err = intel_secure_send(hdev, 0x02, 256, fw->data + 388);
375 BT_ERR("%s: Failed to send firmware signature (%d)",
380 fw_ptr = fw->data + 644;
383 while (fw_ptr - fw->data < fw->size) {
384 struct hci_command_hdr *cmd = (void *)(fw_ptr + frag_len);
386 frag_len += sizeof(*cmd) + cmd->plen;
388 BT_DBG("%s: patching %td/%zu", hdev->name,
389 (fw_ptr - fw->data), fw->size);
391 /* The parameter length of the secure send command requires
392 * a 4 byte alignment. It happens so that the firmware file
393 * contains proper Intel_NOP commands to align the fragments
396 * Send set of commands with 4 byte alignment from the
397 * firmware data buffer as a single Data fragement.
402 /* Send each command from the firmware data buffer as
403 * a single Data fragment.
405 err = intel_secure_send(hdev, 0x01, frag_len, fw_ptr);
407 BT_ERR("%s: Failed to send firmware data (%d)",
416 set_bit(STATE_FIRMWARE_LOADED, &intel->flags);
418 BT_INFO("%s: Waiting for firmware download to complete", hdev->name);
420 /* Before switching the device into operational mode and with that
421 * booting the loaded firmware, wait for the bootloader notification
422 * that all fragments have been successfully received.
424 * When the event processing receives the notification, then the
425 * STATE_DOWNLOADING flag will be cleared.
427 * The firmware loading should not take longer than 5 seconds
428 * and thus just timeout if that happens and fail the setup
431 err = wait_on_bit_timeout(&intel->flags, STATE_DOWNLOADING,
433 msecs_to_jiffies(5000));
435 BT_ERR("%s: Firmware loading interrupted", hdev->name);
441 BT_ERR("%s: Firmware loading timeout", hdev->name);
446 if (test_bit(STATE_FIRMWARE_FAILED, &intel->flags)) {
447 BT_ERR("%s: Firmware loading failed", hdev->name);
452 rettime = ktime_get();
453 delta = ktime_sub(rettime, calltime);
454 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
456 BT_INFO("%s: Firmware loaded in %llu usecs", hdev->name, duration);
459 release_firmware(fw);
464 calltime = ktime_get();
466 set_bit(STATE_BOOTING, &intel->flags);
468 skb = __hci_cmd_sync(hdev, 0xfc01, sizeof(reset_param), reset_param,
475 /* The bootloader will not indicate when the device is ready. This
476 * is done by the operational firmware sending bootup notification.
478 * Booting into operational firmware should not take longer than
479 * 1 second. However if that happens, then just fail the setup
480 * since something went wrong.
482 BT_INFO("%s: Waiting for device to boot", hdev->name);
484 err = wait_on_bit_timeout(&intel->flags, STATE_BOOTING,
486 msecs_to_jiffies(1000));
489 BT_ERR("%s: Device boot interrupted", hdev->name);
494 BT_ERR("%s: Device boot timeout", hdev->name);
498 rettime = ktime_get();
499 delta = ktime_sub(rettime, calltime);
500 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
502 BT_INFO("%s: Device booted in %llu usecs", hdev->name, duration);
504 clear_bit(STATE_BOOTLOADER, &intel->flags);
509 static int intel_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
511 struct hci_uart *hu = hci_get_drvdata(hdev);
512 struct intel_data *intel = hu->priv;
513 struct hci_event_hdr *hdr;
515 if (!test_bit(STATE_BOOTLOADER, &intel->flags))
518 hdr = (void *)skb->data;
520 /* When the firmware loading completes the device sends
521 * out a vendor specific event indicating the result of
522 * the firmware loading.
524 if (skb->len == 7 && hdr->evt == 0xff && hdr->plen == 0x05 &&
525 skb->data[2] == 0x06) {
526 if (skb->data[3] != 0x00)
527 set_bit(STATE_FIRMWARE_FAILED, &intel->flags);
529 if (test_and_clear_bit(STATE_DOWNLOADING, &intel->flags) &&
530 test_bit(STATE_FIRMWARE_LOADED, &intel->flags)) {
531 smp_mb__after_atomic();
532 wake_up_bit(&intel->flags, STATE_DOWNLOADING);
535 /* When switching to the operational firmware the device
536 * sends a vendor specific event indicating that the bootup
539 } else if (skb->len == 9 && hdr->evt == 0xff && hdr->plen == 0x07 &&
540 skb->data[2] == 0x02) {
541 if (test_and_clear_bit(STATE_BOOTING, &intel->flags)) {
542 smp_mb__after_atomic();
543 wake_up_bit(&intel->flags, STATE_BOOTING);
547 return hci_recv_frame(hdev, skb);
550 static const struct h4_recv_pkt intel_recv_pkts[] = {
551 { H4_RECV_ACL, .recv = hci_recv_frame },
552 { H4_RECV_SCO, .recv = hci_recv_frame },
553 { H4_RECV_EVENT, .recv = intel_recv_event },
556 static int intel_recv(struct hci_uart *hu, const void *data, int count)
558 struct intel_data *intel = hu->priv;
560 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
563 intel->rx_skb = h4_recv_buf(hu->hdev, intel->rx_skb, data, count,
565 ARRAY_SIZE(intel_recv_pkts));
566 if (IS_ERR(intel->rx_skb)) {
567 int err = PTR_ERR(intel->rx_skb);
568 BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
569 intel->rx_skb = NULL;
576 static int intel_enqueue(struct hci_uart *hu, struct sk_buff *skb)
578 struct intel_data *intel = hu->priv;
580 BT_DBG("hu %p skb %p", hu, skb);
582 skb_queue_tail(&intel->txq, skb);
587 static struct sk_buff *intel_dequeue(struct hci_uart *hu)
589 struct intel_data *intel = hu->priv;
592 skb = skb_dequeue(&intel->txq);
596 if (test_bit(STATE_BOOTLOADER, &intel->flags) &&
597 (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT)) {
598 struct hci_command_hdr *cmd = (void *)skb->data;
599 __u16 opcode = le16_to_cpu(cmd->opcode);
601 /* When the 0xfc01 command is issued to boot into
602 * the operational firmware, it will actually not
603 * send a command complete event. To keep the flow
604 * control working inject that event here.
606 if (opcode == 0xfc01)
607 inject_cmd_complete(hu->hdev, opcode);
610 /* Prepend skb with frame type */
611 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
616 static const struct hci_uart_proto intel_proto = {
617 .id = HCI_UART_INTEL,
619 .init_speed = 115200,
621 .close = intel_close,
622 .flush = intel_flush,
623 .setup = intel_setup,
625 .enqueue = intel_enqueue,
626 .dequeue = intel_dequeue,
629 int __init intel_init(void)
631 return hci_uart_register_proto(&intel_proto);
634 int __exit intel_deinit(void)
636 return hci_uart_unregister_proto(&intel_proto);