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Commit | Line | Data |
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e9a2dd26 MH |
1 | /* |
2 | * | |
3 | * Bluetooth HCI UART driver for Broadcom devices | |
4 | * | |
5 | * Copyright (C) 2015 Intel Corporation | |
6 | * | |
7 | * | |
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. | |
12 | * | |
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. | |
17 | * | |
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 | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/skbuff.h> | |
18aeb444 | 27 | #include <linux/firmware.h> |
e9a2dd26 MH |
28 | |
29 | #include <net/bluetooth/bluetooth.h> | |
30 | #include <net/bluetooth/hci_core.h> | |
31 | ||
bdd8818e | 32 | #include "btbcm.h" |
e9a2dd26 | 33 | #include "hci_uart.h" |
bdd8818e MH |
34 | |
35 | struct bcm_data { | |
36 | struct sk_buff *rx_skb; | |
37 | struct sk_buff_head txq; | |
38 | }; | |
39 | ||
61b2fc2b FD |
40 | static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed) |
41 | { | |
42 | struct hci_dev *hdev = hu->hdev; | |
43 | struct sk_buff *skb; | |
44 | struct bcm_update_uart_baud_rate param; | |
45 | ||
46 | if (speed > 3000000) { | |
47 | struct bcm_write_uart_clock_setting clock; | |
48 | ||
49 | clock.type = BCM_UART_CLOCK_48MHZ; | |
50 | ||
51 | BT_DBG("%s: Set Controller clock (%d)", hdev->name, clock.type); | |
52 | ||
53 | /* This Broadcom specific command changes the UART's controller | |
54 | * clock for baud rate > 3000000. | |
55 | */ | |
56 | skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT); | |
57 | if (IS_ERR(skb)) { | |
58 | int err = PTR_ERR(skb); | |
59 | BT_ERR("%s: BCM: failed to write clock command (%d)", | |
60 | hdev->name, err); | |
61 | return err; | |
62 | } | |
63 | ||
64 | kfree_skb(skb); | |
65 | } | |
66 | ||
67 | BT_DBG("%s: Set Controller UART speed to %d bit/s", hdev->name, speed); | |
68 | ||
69 | param.zero = cpu_to_le16(0); | |
70 | param.baud_rate = cpu_to_le32(speed); | |
71 | ||
72 | /* This Broadcom specific command changes the UART's controller baud | |
73 | * rate. | |
74 | */ | |
75 | skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), ¶m, | |
76 | HCI_INIT_TIMEOUT); | |
77 | if (IS_ERR(skb)) { | |
78 | int err = PTR_ERR(skb); | |
79 | BT_ERR("%s: BCM: failed to write update baudrate command (%d)", | |
80 | hdev->name, err); | |
81 | return err; | |
82 | } | |
83 | ||
84 | kfree_skb(skb); | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
bdd8818e MH |
89 | static int bcm_open(struct hci_uart *hu) |
90 | { | |
91 | struct bcm_data *bcm; | |
92 | ||
93 | BT_DBG("hu %p", hu); | |
94 | ||
95 | bcm = kzalloc(sizeof(*bcm), GFP_KERNEL); | |
96 | if (!bcm) | |
97 | return -ENOMEM; | |
98 | ||
99 | skb_queue_head_init(&bcm->txq); | |
100 | ||
101 | hu->priv = bcm; | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static int bcm_close(struct hci_uart *hu) | |
106 | { | |
107 | struct bcm_data *bcm = hu->priv; | |
108 | ||
109 | BT_DBG("hu %p", hu); | |
110 | ||
111 | skb_queue_purge(&bcm->txq); | |
112 | kfree_skb(bcm->rx_skb); | |
113 | kfree(bcm); | |
114 | ||
115 | hu->priv = NULL; | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static int bcm_flush(struct hci_uart *hu) | |
120 | { | |
121 | struct bcm_data *bcm = hu->priv; | |
122 | ||
123 | BT_DBG("hu %p", hu); | |
124 | ||
125 | skb_queue_purge(&bcm->txq); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static int bcm_setup(struct hci_uart *hu) | |
131 | { | |
6be09b48 FD |
132 | char fw_name[64]; |
133 | const struct firmware *fw; | |
960ef1d7 | 134 | unsigned int speed; |
6be09b48 FD |
135 | int err; |
136 | ||
bdd8818e MH |
137 | BT_DBG("hu %p", hu); |
138 | ||
139 | hu->hdev->set_bdaddr = btbcm_set_bdaddr; | |
140 | ||
6be09b48 FD |
141 | err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name)); |
142 | if (err) | |
143 | return err; | |
144 | ||
145 | err = request_firmware(&fw, fw_name, &hu->hdev->dev); | |
146 | if (err < 0) { | |
147 | BT_INFO("%s: BCM: Patch %s not found", hu->hdev->name, fw_name); | |
148 | return 0; | |
149 | } | |
150 | ||
151 | err = btbcm_patchram(hu->hdev, fw); | |
152 | if (err) { | |
153 | BT_INFO("%s: BCM: Patch failed (%d)", hu->hdev->name, err); | |
154 | goto finalize; | |
155 | } | |
156 | ||
960ef1d7 FD |
157 | /* Init speed if any */ |
158 | if (hu->init_speed) | |
159 | speed = hu->init_speed; | |
160 | else if (hu->proto->init_speed) | |
161 | speed = hu->proto->init_speed; | |
162 | else | |
163 | speed = 0; | |
164 | ||
165 | if (speed) | |
166 | hci_uart_set_baudrate(hu, speed); | |
167 | ||
168 | /* Operational speed if any */ | |
169 | if (hu->oper_speed) | |
170 | speed = hu->oper_speed; | |
171 | else if (hu->proto->oper_speed) | |
172 | speed = hu->proto->oper_speed; | |
173 | else | |
174 | speed = 0; | |
175 | ||
176 | if (speed) { | |
177 | err = bcm_set_baudrate(hu, speed); | |
61b2fc2b | 178 | if (!err) |
960ef1d7 | 179 | hci_uart_set_baudrate(hu, speed); |
61b2fc2b FD |
180 | } |
181 | ||
6be09b48 FD |
182 | finalize: |
183 | release_firmware(fw); | |
184 | ||
185 | err = btbcm_finalize(hu->hdev); | |
186 | ||
187 | return err; | |
bdd8818e MH |
188 | } |
189 | ||
79b8df93 MH |
190 | static const struct h4_recv_pkt bcm_recv_pkts[] = { |
191 | { H4_RECV_ACL, .recv = hci_recv_frame }, | |
192 | { H4_RECV_SCO, .recv = hci_recv_frame }, | |
193 | { H4_RECV_EVENT, .recv = hci_recv_frame }, | |
194 | }; | |
195 | ||
bdd8818e MH |
196 | static int bcm_recv(struct hci_uart *hu, const void *data, int count) |
197 | { | |
198 | struct bcm_data *bcm = hu->priv; | |
199 | ||
200 | if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) | |
201 | return -EUNATCH; | |
202 | ||
79b8df93 MH |
203 | bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count, |
204 | bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts)); | |
bdd8818e MH |
205 | if (IS_ERR(bcm->rx_skb)) { |
206 | int err = PTR_ERR(bcm->rx_skb); | |
207 | BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err); | |
37134167 | 208 | bcm->rx_skb = NULL; |
bdd8818e MH |
209 | return err; |
210 | } | |
211 | ||
212 | return count; | |
213 | } | |
214 | ||
215 | static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb) | |
216 | { | |
217 | struct bcm_data *bcm = hu->priv; | |
218 | ||
219 | BT_DBG("hu %p skb %p", hu, skb); | |
220 | ||
221 | /* Prepend skb with frame type */ | |
222 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); | |
223 | skb_queue_tail(&bcm->txq, skb); | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | static struct sk_buff *bcm_dequeue(struct hci_uart *hu) | |
229 | { | |
230 | struct bcm_data *bcm = hu->priv; | |
231 | ||
232 | return skb_dequeue(&bcm->txq); | |
233 | } | |
234 | ||
235 | static const struct hci_uart_proto bcm_proto = { | |
236 | .id = HCI_UART_BCM, | |
237 | .name = "BCM", | |
61b2fc2b FD |
238 | .init_speed = 115200, |
239 | .oper_speed = 4000000, | |
bdd8818e MH |
240 | .open = bcm_open, |
241 | .close = bcm_close, | |
242 | .flush = bcm_flush, | |
243 | .setup = bcm_setup, | |
61b2fc2b | 244 | .set_baudrate = bcm_set_baudrate, |
bdd8818e MH |
245 | .recv = bcm_recv, |
246 | .enqueue = bcm_enqueue, | |
247 | .dequeue = bcm_dequeue, | |
248 | }; | |
249 | ||
250 | int __init bcm_init(void) | |
251 | { | |
252 | return hci_uart_register_proto(&bcm_proto); | |
253 | } | |
254 | ||
255 | int __exit bcm_deinit(void) | |
256 | { | |
257 | return hci_uart_unregister_proto(&bcm_proto); | |
258 | } |