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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Bluetooth HCI UART driver for Intel/AG6xx devices
5 *
6 * Copyright (C) 2016 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/tty.h>
15
16#include <net/bluetooth/bluetooth.h>
17#include <net/bluetooth/hci_core.h>
18
19#include "hci_uart.h"
20#include "btintel.h"
21
22struct ag6xx_data {
23 struct sk_buff *rx_skb;
24 struct sk_buff_head txq;
25};
26
27struct pbn_entry {
28 __le32 addr;
29 __le32 plen;
30 __u8 data[0];
31} __packed;
32
33static int ag6xx_open(struct hci_uart *hu)
34{
35 struct ag6xx_data *ag6xx;
36
37 BT_DBG("hu %p", hu);
38
39 ag6xx = kzalloc(sizeof(*ag6xx), GFP_KERNEL);
40 if (!ag6xx)
41 return -ENOMEM;
42
43 skb_queue_head_init(&ag6xx->txq);
44
45 hu->priv = ag6xx;
46 return 0;
47}
48
49static int ag6xx_close(struct hci_uart *hu)
50{
51 struct ag6xx_data *ag6xx = hu->priv;
52
53 BT_DBG("hu %p", hu);
54
55 skb_queue_purge(&ag6xx->txq);
56 kfree_skb(ag6xx->rx_skb);
57 kfree(ag6xx);
58
59 hu->priv = NULL;
60 return 0;
61}
62
63static int ag6xx_flush(struct hci_uart *hu)
64{
65 struct ag6xx_data *ag6xx = hu->priv;
66
67 BT_DBG("hu %p", hu);
68
69 skb_queue_purge(&ag6xx->txq);
70 return 0;
71}
72
73static struct sk_buff *ag6xx_dequeue(struct hci_uart *hu)
74{
75 struct ag6xx_data *ag6xx = hu->priv;
76 struct sk_buff *skb;
77
78 skb = skb_dequeue(&ag6xx->txq);
79 if (!skb)
80 return skb;
81
82 /* Prepend skb with frame type */
83 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
84 return skb;
85}
86
87static int ag6xx_enqueue(struct hci_uart *hu, struct sk_buff *skb)
88{
89 struct ag6xx_data *ag6xx = hu->priv;
90
91 skb_queue_tail(&ag6xx->txq, skb);
92 return 0;
93}
94
95static const struct h4_recv_pkt ag6xx_recv_pkts[] = {
96 { H4_RECV_ACL, .recv = hci_recv_frame },
97 { H4_RECV_SCO, .recv = hci_recv_frame },
98 { H4_RECV_EVENT, .recv = hci_recv_frame },
99};
100
101static int ag6xx_recv(struct hci_uart *hu, const void *data, int count)
102{
103 struct ag6xx_data *ag6xx = hu->priv;
104
105 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
106 return -EUNATCH;
107
108 ag6xx->rx_skb = h4_recv_buf(hu->hdev, ag6xx->rx_skb, data, count,
109 ag6xx_recv_pkts,
110 ARRAY_SIZE(ag6xx_recv_pkts));
111 if (IS_ERR(ag6xx->rx_skb)) {
112 int err = PTR_ERR(ag6xx->rx_skb);
113 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
114 ag6xx->rx_skb = NULL;
115 return err;
116 }
117
118 return count;
119}
120
121static int intel_mem_write(struct hci_dev *hdev, u32 addr, u32 plen,
122 const void *data)
123{
124 /* Can write a maximum of 247 bytes per HCI command.
125 * HCI cmd Header (3), Intel mem write header (6), data (247).
126 */
127 while (plen > 0) {
128 struct sk_buff *skb;
129 u8 cmd_param[253], fragment_len = (plen > 247) ? 247 : plen;
130 __le32 leaddr = cpu_to_le32(addr);
131
132 memcpy(cmd_param, &leaddr, 4);
133 cmd_param[4] = 0;
134 cmd_param[5] = fragment_len;
135 memcpy(cmd_param + 6, data, fragment_len);
136
137 skb = __hci_cmd_sync(hdev, 0xfc8e, fragment_len + 6, cmd_param,
138 HCI_INIT_TIMEOUT);
139 if (IS_ERR(skb))
140 return PTR_ERR(skb);
141 kfree_skb(skb);
142
143 plen -= fragment_len;
144 data += fragment_len;
145 addr += fragment_len;
146 }
147
148 return 0;
149}
150
151static int ag6xx_setup(struct hci_uart *hu)
152{
153 struct hci_dev *hdev = hu->hdev;
154 struct sk_buff *skb;
155 struct intel_version ver;
156 const struct firmware *fw;
157 const u8 *fw_ptr;
158 char fwname[64];
159 bool patched = false;
160 int err;
161
162 hu->hdev->set_diag = btintel_set_diag;
163 hu->hdev->set_bdaddr = btintel_set_bdaddr;
164
165 err = btintel_enter_mfg(hdev);
166 if (err)
167 return err;
168
169 err = btintel_read_version(hdev, &ver);
170 if (err)
171 return err;
172
173 btintel_version_info(hdev, &ver);
174
175 /* The hardware platform number has a fixed value of 0x37 and
176 * for now only accept this single value.
177 */
178 if (ver.hw_platform != 0x37) {
179 bt_dev_err(hdev, "Unsupported Intel hardware platform: 0x%X",
180 ver.hw_platform);
181 return -EINVAL;
182 }
183
184 /* Only the hardware variant iBT 2.1 (AG6XX) is supported by this
185 * firmware setup method.
186 */
187 if (ver.hw_variant != 0x0a) {
188 bt_dev_err(hdev, "Unsupported Intel hardware variant: 0x%x",
189 ver.hw_variant);
190 return -EINVAL;
191 }
192
193 snprintf(fwname, sizeof(fwname), "intel/ibt-hw-%x.%x.bddata",
194 ver.hw_platform, ver.hw_variant);
195
196 err = request_firmware(&fw, fwname, &hdev->dev);
197 if (err < 0) {
198 bt_dev_err(hdev, "Failed to open Intel bddata file: %s (%d)",
199 fwname, err);
200 goto patch;
201 }
202 fw_ptr = fw->data;
203
204 bt_dev_info(hdev, "Applying bddata (%s)", fwname);
205
206 skb = __hci_cmd_sync_ev(hdev, 0xfc2f, fw->size, fw->data,
207 HCI_EV_CMD_STATUS, HCI_CMD_TIMEOUT);
208 if (IS_ERR(skb)) {
209 bt_dev_err(hdev, "Applying bddata failed (%ld)", PTR_ERR(skb));
210 release_firmware(fw);
211 return PTR_ERR(skb);
212 }
213 kfree_skb(skb);
214
215 release_firmware(fw);
216
217patch:
218 /* If there is no applied patch, fw_patch_num is always 0x00. In other
219 * cases, current firmware is already patched. No need to patch it.
220 */
221 if (ver.fw_patch_num) {
222 bt_dev_info(hdev, "Device is already patched. patch num: %02x",
223 ver.fw_patch_num);
224 patched = true;
225 goto complete;
226 }
227
228 snprintf(fwname, sizeof(fwname),
229 "intel/ibt-hw-%x.%x.%x-fw-%x.%x.%x.%x.%x.pbn",
230 ver.hw_platform, ver.hw_variant, ver.hw_revision,
231 ver.fw_variant, ver.fw_revision, ver.fw_build_num,
232 ver.fw_build_ww, ver.fw_build_yy);
233
234 err = request_firmware(&fw, fwname, &hdev->dev);
235 if (err < 0) {
236 bt_dev_err(hdev, "Failed to open Intel patch file: %s(%d)",
237 fwname, err);
238 goto complete;
239 }
240 fw_ptr = fw->data;
241
242 bt_dev_info(hdev, "Patching firmware file (%s)", fwname);
243
244 /* PBN patch file contains a list of binary patches to be applied on top
245 * of the embedded firmware. Each patch entry header contains the target
246 * address and patch size.
247 *
248 * Patch entry:
249 * | addr(le) | patch_len(le) | patch_data |
250 * | 4 Bytes | 4 Bytes | n Bytes |
251 *
252 * PBN file is terminated by a patch entry whose address is 0xffffffff.
253 */
254 while (fw->size > fw_ptr - fw->data) {
255 struct pbn_entry *pbn = (void *)fw_ptr;
256 u32 addr, plen;
257
258 if (pbn->addr == 0xffffffff) {
259 bt_dev_info(hdev, "Patching complete");
260 patched = true;
261 break;
262 }
263
264 addr = le32_to_cpu(pbn->addr);
265 plen = le32_to_cpu(pbn->plen);
266
267 if (fw->data + fw->size <= pbn->data + plen) {
268 bt_dev_info(hdev, "Invalid patch len (%d)", plen);
269 break;
270 }
271
272 bt_dev_info(hdev, "Patching %td/%zu", (fw_ptr - fw->data),
273 fw->size);
274
275 err = intel_mem_write(hdev, addr, plen, pbn->data);
276 if (err) {
277 bt_dev_err(hdev, "Patching failed");
278 break;
279 }
280
281 fw_ptr = pbn->data + plen;
282 }
283
284 release_firmware(fw);
285
286complete:
287 /* Exit manufacturing mode and reset */
288 err = btintel_exit_mfg(hdev, true, patched);
289 if (err)
290 return err;
291
292 /* Set the event mask for Intel specific vendor events. This enables
293 * a few extra events that are useful during general operation.
294 */
295 btintel_set_event_mask_mfg(hdev, false);
296
297 btintel_check_bdaddr(hdev);
298 return 0;
299}
300
301static const struct hci_uart_proto ag6xx_proto = {
302 .id = HCI_UART_AG6XX,
303 .name = "AG6XX",
304 .manufacturer = 2,
305 .open = ag6xx_open,
306 .close = ag6xx_close,
307 .flush = ag6xx_flush,
308 .setup = ag6xx_setup,
309 .recv = ag6xx_recv,
310 .enqueue = ag6xx_enqueue,
311 .dequeue = ag6xx_dequeue,
312};
313
314int __init ag6xx_init(void)
315{
316 return hci_uart_register_proto(&ag6xx_proto);
317}
318
319int __exit ag6xx_deinit(void)
320{
321 return hci_uart_unregister_proto(&ag6xx_proto);
322}