1 /* SPDX-License-Identifier: ISC */
2 /*
3 * Copyright (c) 2005-2011 Atheros Communications Inc.
4 * Copyright (c) 2011-2016 Qualcomm Atheros, Inc.
5 */
6
7 #ifndef _HTC_H_
8 #define _HTC_H_
9
10 #include <linux/kernel.h>
11 #include <linux/list.h>
12 #include <linux/bug.h>
13 #include <linux/skbuff.h>
14 #include <linux/timer.h>
15 #include <linux/bitfield.h>
16
17 struct ath10k;
18
19 /****************/
20 /* HTC protocol */
21 /****************/
22
23 /*
24 * HTC - host-target control protocol
25 *
26 * tx packets are generally <htc_hdr><payload>
27 * rx packets are more complex: <htc_hdr><payload><trailer>
28 *
29 * The payload + trailer length is stored in len.
30 * To get payload-only length one needs to payload - trailer_len.
31 *
32 * Trailer contains (possibly) multiple <htc_record>.
33 * Each record is a id-len-value.
34 *
35 * HTC header flags, control_byte0, control_byte1
36 * have different meaning depending whether its tx
37 * or rx.
38 *
39 * Alignment: htc_hdr, payload and trailer are
40 * 4-byte aligned.
41 */
42
43 #define HTC_HOST_MAX_MSG_PER_RX_BUNDLE 32
44
45 enum ath10k_htc_tx_flags {
46 ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE = 0x01,
47 ATH10K_HTC_FLAG_SEND_BUNDLE = 0x02
48 };
49
50 enum ath10k_htc_rx_flags {
51 ATH10K_HTC_FLAGS_RECV_1MORE_BLOCK = 0x01,
52 ATH10K_HTC_FLAG_TRAILER_PRESENT = 0x02,
53 };
54
55 #define ATH10K_HTC_FLAG_BUNDLE_MASK GENMASK(7, 4)
56
57 /* bits 2-3 are for extra bundle count bits 4-5 */
58 #define ATH10K_HTC_BUNDLE_EXTRA_MASK GENMASK(3, 2)
59 #define ATH10K_HTC_BUNDLE_EXTRA_SHIFT 4
60
ath10k_htc_get_bundle_count(u8 max_msgs,u8 flags)61 static inline unsigned int ath10k_htc_get_bundle_count(u8 max_msgs, u8 flags)
62 {
63 unsigned int count, extra_count = 0;
64
65 count = FIELD_GET(ATH10K_HTC_FLAG_BUNDLE_MASK, flags);
66
67 if (max_msgs > 16)
68 extra_count = FIELD_GET(ATH10K_HTC_BUNDLE_EXTRA_MASK, flags) <<
69 ATH10K_HTC_BUNDLE_EXTRA_SHIFT;
70
71 return count + extra_count;
72 }
73
74 struct ath10k_htc_hdr {
75 u8 eid; /* @enum ath10k_htc_ep_id */
76 u8 flags; /* @enum ath10k_htc_tx_flags, ath10k_htc_rx_flags */
77 __le16 len;
78 union {
79 u8 trailer_len; /* for rx */
80 u8 control_byte0;
81 } __packed;
82 union {
83 u8 seq_no; /* for tx */
84 u8 control_byte1;
85 } __packed;
86 union {
87 __le16 pad_len;
88 struct {
89 u8 pad0;
90 u8 pad1;
91 } __packed;
92 } __packed;
93
94 } __packed __aligned(4);
95
96 enum ath10k_ath10k_htc_msg_id {
97 ATH10K_HTC_MSG_READY_ID = 1,
98 ATH10K_HTC_MSG_CONNECT_SERVICE_ID = 2,
99 ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID = 3,
100 ATH10K_HTC_MSG_SETUP_COMPLETE_ID = 4,
101 ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID = 5,
102 ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE = 6
103 };
104
105 enum ath10k_htc_version {
106 ATH10K_HTC_VERSION_2P0 = 0x00, /* 2.0 */
107 ATH10K_HTC_VERSION_2P1 = 0x01, /* 2.1 */
108 };
109
110 enum ath10k_htc_conn_flags {
111 ATH10K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_ONE_FOURTH = 0x0,
112 ATH10K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_ONE_HALF = 0x1,
113 ATH10K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_THREE_FOURTHS = 0x2,
114 ATH10K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_UNITY = 0x3,
115 #define ATH10K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_MASK 0x3
116 ATH10K_HTC_CONN_FLAGS_REDUCE_CREDIT_DRIBBLE = 1 << 2,
117 ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL = 1 << 3
118 #define ATH10K_HTC_CONN_FLAGS_RECV_ALLOC_MASK 0xFF00
119 #define ATH10K_HTC_CONN_FLAGS_RECV_ALLOC_LSB 8
120 };
121
122 #define ATH10K_HTC_MSG_READY_EXT_ALT_DATA_MASK 0xFFF
123
124 enum ath10k_htc_conn_svc_status {
125 ATH10K_HTC_CONN_SVC_STATUS_SUCCESS = 0,
126 ATH10K_HTC_CONN_SVC_STATUS_NOT_FOUND = 1,
127 ATH10K_HTC_CONN_SVC_STATUS_FAILED = 2,
128 ATH10K_HTC_CONN_SVC_STATUS_NO_RESOURCES = 3,
129 ATH10K_HTC_CONN_SVC_STATUS_NO_MORE_EP = 4
130 };
131
132 #define ATH10K_MAX_MSG_PER_HTC_TX_BUNDLE 32
133 #define ATH10K_MIN_MSG_PER_HTC_TX_BUNDLE 2
134 #define ATH10K_MIN_CREDIT_PER_HTC_TX_BUNDLE 2
135
136 enum ath10k_htc_setup_complete_flags {
137 ATH10K_HTC_SETUP_COMPLETE_FLAGS_RX_BNDL_EN = 1
138 };
139
140 struct ath10k_ath10k_htc_msg_hdr {
141 __le16 message_id; /* @enum htc_message_id */
142 } __packed;
143
144 struct ath10k_htc_unknown {
145 u8 pad0;
146 u8 pad1;
147 } __packed;
148
149 struct ath10k_htc_ready {
150 __le16 credit_count;
151 __le16 credit_size;
152 u8 max_endpoints;
153 u8 pad0;
154 } __packed;
155
156 struct ath10k_htc_ready_extended {
157 struct ath10k_htc_ready base;
158 u8 htc_version; /* @enum ath10k_htc_version */
159 u8 max_msgs_per_htc_bundle;
160 union {
161 __le16 reserved;
162 struct {
163 u8 pad0;
164 u8 pad1;
165 } __packed;
166 } __packed;
167
168 } __packed;
169
170 struct ath10k_htc_conn_svc {
171 __le16 service_id;
172 __le16 flags; /* @enum ath10k_htc_conn_flags */
173 u8 pad0;
174 u8 pad1;
175 } __packed;
176
177 struct ath10k_htc_conn_svc_response {
178 __le16 service_id;
179 u8 status; /* @enum ath10k_htc_conn_svc_status */
180 u8 eid;
181 __le16 max_msg_size;
182 } __packed;
183
184 struct ath10k_htc_setup_complete_extended {
185 u8 pad0;
186 u8 pad1;
187 __le32 flags; /* @enum htc_setup_complete_flags */
188 u8 max_msgs_per_bundled_recv;
189 u8 pad2;
190 u8 pad3;
191 u8 pad4;
192 } __packed;
193
194 struct ath10k_htc_msg {
195 struct ath10k_ath10k_htc_msg_hdr hdr;
196 union {
197 /* host-to-target */
198 struct ath10k_htc_conn_svc connect_service;
199 struct ath10k_htc_ready ready;
200 struct ath10k_htc_ready_extended ready_ext;
201 struct ath10k_htc_unknown unknown;
202 struct ath10k_htc_setup_complete_extended setup_complete_ext;
203
204 /* target-to-host */
205 struct ath10k_htc_conn_svc_response connect_service_response;
206 };
207 } __packed __aligned(4);
208
209 enum ath10k_ath10k_htc_record_id {
210 ATH10K_HTC_RECORD_NULL = 0,
211 ATH10K_HTC_RECORD_CREDITS = 1,
212 ATH10K_HTC_RECORD_LOOKAHEAD = 2,
213 ATH10K_HTC_RECORD_LOOKAHEAD_BUNDLE = 3,
214 };
215
216 struct ath10k_ath10k_htc_record_hdr {
217 u8 id; /* @enum ath10k_ath10k_htc_record_id */
218 u8 len;
219 u8 pad0;
220 u8 pad1;
221 } __packed;
222
223 struct ath10k_htc_credit_report {
224 u8 eid; /* @enum ath10k_htc_ep_id */
225 u8 credits;
226 u8 pad0;
227 u8 pad1;
228 } __packed;
229
230 struct ath10k_htc_lookahead_report {
231 u8 pre_valid;
232 u8 pad0;
233 u8 pad1;
234 u8 pad2;
235 u8 lookahead[4];
236 u8 post_valid;
237 u8 pad3;
238 u8 pad4;
239 u8 pad5;
240 } __packed;
241
242 struct ath10k_htc_lookahead_bundle {
243 u8 lookahead[4];
244 } __packed;
245
246 struct ath10k_htc_record {
247 struct ath10k_ath10k_htc_record_hdr hdr;
248 union {
249 DECLARE_FLEX_ARRAY(struct ath10k_htc_credit_report, credit_report);
250 DECLARE_FLEX_ARRAY(struct ath10k_htc_lookahead_report, lookahead_report);
251 DECLARE_FLEX_ARRAY(struct ath10k_htc_lookahead_bundle, lookahead_bundle);
252 };
253 } __packed __aligned(4);
254
255 /*******************/
256 /* Host-side stuff */
257 /*******************/
258
259 enum ath10k_htc_svc_gid {
260 ATH10K_HTC_SVC_GRP_RSVD = 0,
261 ATH10K_HTC_SVC_GRP_WMI = 1,
262 ATH10K_HTC_SVC_GRP_NMI = 2,
263 ATH10K_HTC_SVC_GRP_HTT = 3,
264 ATH10K_LOG_SERVICE_GROUP = 6,
265
266 ATH10K_HTC_SVC_GRP_TEST = 254,
267 ATH10K_HTC_SVC_GRP_LAST = 255,
268 };
269
270 #define SVC(group, idx) \
271 (int)(((int)(group) << 8) | (int)(idx))
272
273 enum ath10k_htc_svc_id {
274 /* NOTE: service ID of 0x0000 is reserved and should never be used */
275 ATH10K_HTC_SVC_ID_RESERVED = 0x0000,
276 ATH10K_HTC_SVC_ID_UNUSED = ATH10K_HTC_SVC_ID_RESERVED,
277
278 ATH10K_HTC_SVC_ID_RSVD_CTRL = SVC(ATH10K_HTC_SVC_GRP_RSVD, 1),
279 ATH10K_HTC_SVC_ID_WMI_CONTROL = SVC(ATH10K_HTC_SVC_GRP_WMI, 0),
280 ATH10K_HTC_SVC_ID_WMI_DATA_BE = SVC(ATH10K_HTC_SVC_GRP_WMI, 1),
281 ATH10K_HTC_SVC_ID_WMI_DATA_BK = SVC(ATH10K_HTC_SVC_GRP_WMI, 2),
282 ATH10K_HTC_SVC_ID_WMI_DATA_VI = SVC(ATH10K_HTC_SVC_GRP_WMI, 3),
283 ATH10K_HTC_SVC_ID_WMI_DATA_VO = SVC(ATH10K_HTC_SVC_GRP_WMI, 4),
284
285 ATH10K_HTC_SVC_ID_NMI_CONTROL = SVC(ATH10K_HTC_SVC_GRP_NMI, 0),
286 ATH10K_HTC_SVC_ID_NMI_DATA = SVC(ATH10K_HTC_SVC_GRP_NMI, 1),
287
288 ATH10K_HTC_SVC_ID_HTT_DATA_MSG = SVC(ATH10K_HTC_SVC_GRP_HTT, 0),
289
290 ATH10K_HTC_SVC_ID_HTT_DATA2_MSG = SVC(ATH10K_HTC_SVC_GRP_HTT, 1),
291 ATH10K_HTC_SVC_ID_HTT_DATA3_MSG = SVC(ATH10K_HTC_SVC_GRP_HTT, 2),
292 ATH10K_HTC_SVC_ID_HTT_LOG_MSG = SVC(ATH10K_LOG_SERVICE_GROUP, 0),
293 /* raw stream service (i.e. flash, tcmd, calibration apps) */
294 ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS = SVC(ATH10K_HTC_SVC_GRP_TEST, 0),
295 };
296
297 #undef SVC
298
299 enum ath10k_htc_ep_id {
300 ATH10K_HTC_EP_UNUSED = -1,
301 ATH10K_HTC_EP_0 = 0,
302 ATH10K_HTC_EP_1 = 1,
303 ATH10K_HTC_EP_2,
304 ATH10K_HTC_EP_3,
305 ATH10K_HTC_EP_4,
306 ATH10K_HTC_EP_5,
307 ATH10K_HTC_EP_6,
308 ATH10K_HTC_EP_7,
309 ATH10K_HTC_EP_8,
310 ATH10K_HTC_EP_COUNT,
311 };
312
313 struct ath10k_htc_ops {
314 void (*target_send_suspend_complete)(struct ath10k *ar);
315 };
316
317 struct ath10k_htc_ep_ops {
318 void (*ep_tx_complete)(struct ath10k *, struct sk_buff *);
319 void (*ep_rx_complete)(struct ath10k *, struct sk_buff *);
320 void (*ep_tx_credits)(struct ath10k *);
321 };
322
323 /* service connection information */
324 struct ath10k_htc_svc_conn_req {
325 u16 service_id;
326 struct ath10k_htc_ep_ops ep_ops;
327 int max_send_queue_depth;
328 };
329
330 /* service connection response information */
331 struct ath10k_htc_svc_conn_resp {
332 u8 buffer_len;
333 u8 actual_len;
334 enum ath10k_htc_ep_id eid;
335 unsigned int max_msg_len;
336 u8 connect_resp_code;
337 };
338
339 #define ATH10K_NUM_CONTROL_TX_BUFFERS 2
340 #define ATH10K_HTC_MAX_LEN 4096
341 #define ATH10K_HTC_MAX_CTRL_MSG_LEN 256
342 #define ATH10K_HTC_WAIT_TIMEOUT_HZ (1 * HZ)
343 #define ATH10K_HTC_CONTROL_BUFFER_SIZE (ATH10K_HTC_MAX_CTRL_MSG_LEN + \
344 sizeof(struct ath10k_htc_hdr))
345 #define ATH10K_HTC_CONN_SVC_TIMEOUT_HZ (1 * HZ)
346
347 struct ath10k_htc_ep {
348 struct ath10k_htc *htc;
349 enum ath10k_htc_ep_id eid;
350 enum ath10k_htc_svc_id service_id;
351 struct ath10k_htc_ep_ops ep_ops;
352
353 int max_tx_queue_depth;
354 int max_ep_message_len;
355 u8 ul_pipe_id;
356 u8 dl_pipe_id;
357
358 u8 seq_no; /* for debugging */
359 int tx_credits;
360 int tx_credit_size;
361 bool tx_credit_flow_enabled;
362 bool bundle_tx;
363 struct sk_buff_head tx_req_head;
364 struct sk_buff_head tx_complete_head;
365
366 };
367
368 struct ath10k_htc_svc_tx_credits {
369 u16 service_id;
370 u8 credit_allocation;
371 };
372
373 struct ath10k_htc {
374 struct ath10k *ar;
375 struct ath10k_htc_ep endpoint[ATH10K_HTC_EP_COUNT];
376
377 /* protects endpoints */
378 spinlock_t tx_lock;
379
380 struct ath10k_htc_ops htc_ops;
381
382 u8 control_resp_buffer[ATH10K_HTC_MAX_CTRL_MSG_LEN];
383 int control_resp_len;
384
385 struct completion ctl_resp;
386
387 int total_transmit_credits;
388 int target_credit_size;
389 u8 max_msgs_per_htc_bundle;
390 int alt_data_credit_size;
391 };
392
393 int ath10k_htc_init(struct ath10k *ar);
394 int ath10k_htc_wait_target(struct ath10k_htc *htc);
395 void ath10k_htc_setup_tx_req(struct ath10k_htc_ep *ep);
396 int ath10k_htc_start(struct ath10k_htc *htc);
397 int ath10k_htc_connect_service(struct ath10k_htc *htc,
398 struct ath10k_htc_svc_conn_req *conn_req,
399 struct ath10k_htc_svc_conn_resp *conn_resp);
400 void ath10k_htc_change_tx_credit_flow(struct ath10k_htc *htc,
401 enum ath10k_htc_ep_id eid,
402 bool enable);
403 int ath10k_htc_send(struct ath10k_htc *htc, enum ath10k_htc_ep_id eid,
404 struct sk_buff *packet);
405 void ath10k_htc_stop_hl(struct ath10k *ar);
406
407 int ath10k_htc_send_hl(struct ath10k_htc *htc, enum ath10k_htc_ep_id eid,
408 struct sk_buff *packet);
409 struct sk_buff *ath10k_htc_alloc_skb(struct ath10k *ar, int size);
410 void ath10k_htc_tx_completion_handler(struct ath10k *ar, struct sk_buff *skb);
411 void ath10k_htc_rx_completion_handler(struct ath10k *ar, struct sk_buff *skb);
412 void ath10k_htc_notify_tx_completion(struct ath10k_htc_ep *ep,
413 struct sk_buff *skb);
414 int ath10k_htc_process_trailer(struct ath10k_htc *htc,
415 u8 *buffer,
416 int length,
417 enum ath10k_htc_ep_id src_eid,
418 void *next_lookaheads,
419 int *next_lookaheads_len);
420
421 #endif
422