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 		struct ath10k_htc_credit_report credit_report[0];
250 		struct ath10k_htc_lookahead_report lookahead_report[0];
251 		struct ath10k_htc_lookahead_bundle lookahead_bundle[0];
252 		u8 pauload[0];
253 	};
254 } __packed __aligned(4);
255 
256 /*
257  * note: the trailer offset is dynamic depending
258  * on payload length. this is only a struct layout draft
259  */
260 struct ath10k_htc_frame {
261 	struct ath10k_htc_hdr hdr;
262 	union {
263 		struct ath10k_htc_msg msg;
264 		u8 payload[0];
265 	};
266 	struct ath10k_htc_record trailer[0];
267 } __packed __aligned(4);
268 
269 /*******************/
270 /* Host-side stuff */
271 /*******************/
272 
273 enum ath10k_htc_svc_gid {
274 	ATH10K_HTC_SVC_GRP_RSVD = 0,
275 	ATH10K_HTC_SVC_GRP_WMI = 1,
276 	ATH10K_HTC_SVC_GRP_NMI = 2,
277 	ATH10K_HTC_SVC_GRP_HTT = 3,
278 	ATH10K_LOG_SERVICE_GROUP = 6,
279 
280 	ATH10K_HTC_SVC_GRP_TEST = 254,
281 	ATH10K_HTC_SVC_GRP_LAST = 255,
282 };
283 
284 #define SVC(group, idx) \
285 	(int)(((int)(group) << 8) | (int)(idx))
286 
287 enum ath10k_htc_svc_id {
288 	/* NOTE: service ID of 0x0000 is reserved and should never be used */
289 	ATH10K_HTC_SVC_ID_RESERVED	= 0x0000,
290 	ATH10K_HTC_SVC_ID_UNUSED	= ATH10K_HTC_SVC_ID_RESERVED,
291 
292 	ATH10K_HTC_SVC_ID_RSVD_CTRL	= SVC(ATH10K_HTC_SVC_GRP_RSVD, 1),
293 	ATH10K_HTC_SVC_ID_WMI_CONTROL	= SVC(ATH10K_HTC_SVC_GRP_WMI, 0),
294 	ATH10K_HTC_SVC_ID_WMI_DATA_BE	= SVC(ATH10K_HTC_SVC_GRP_WMI, 1),
295 	ATH10K_HTC_SVC_ID_WMI_DATA_BK	= SVC(ATH10K_HTC_SVC_GRP_WMI, 2),
296 	ATH10K_HTC_SVC_ID_WMI_DATA_VI	= SVC(ATH10K_HTC_SVC_GRP_WMI, 3),
297 	ATH10K_HTC_SVC_ID_WMI_DATA_VO	= SVC(ATH10K_HTC_SVC_GRP_WMI, 4),
298 
299 	ATH10K_HTC_SVC_ID_NMI_CONTROL	= SVC(ATH10K_HTC_SVC_GRP_NMI, 0),
300 	ATH10K_HTC_SVC_ID_NMI_DATA	= SVC(ATH10K_HTC_SVC_GRP_NMI, 1),
301 
302 	ATH10K_HTC_SVC_ID_HTT_DATA_MSG	= SVC(ATH10K_HTC_SVC_GRP_HTT, 0),
303 
304 	ATH10K_HTC_SVC_ID_HTT_DATA2_MSG = SVC(ATH10K_HTC_SVC_GRP_HTT, 1),
305 	ATH10K_HTC_SVC_ID_HTT_DATA3_MSG = SVC(ATH10K_HTC_SVC_GRP_HTT, 2),
306 	ATH10K_HTC_SVC_ID_HTT_LOG_MSG = SVC(ATH10K_LOG_SERVICE_GROUP, 0),
307 	/* raw stream service (i.e. flash, tcmd, calibration apps) */
308 	ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS = SVC(ATH10K_HTC_SVC_GRP_TEST, 0),
309 };
310 
311 #undef SVC
312 
313 enum ath10k_htc_ep_id {
314 	ATH10K_HTC_EP_UNUSED = -1,
315 	ATH10K_HTC_EP_0 = 0,
316 	ATH10K_HTC_EP_1 = 1,
317 	ATH10K_HTC_EP_2,
318 	ATH10K_HTC_EP_3,
319 	ATH10K_HTC_EP_4,
320 	ATH10K_HTC_EP_5,
321 	ATH10K_HTC_EP_6,
322 	ATH10K_HTC_EP_7,
323 	ATH10K_HTC_EP_8,
324 	ATH10K_HTC_EP_COUNT,
325 };
326 
327 struct ath10k_htc_ops {
328 	void (*target_send_suspend_complete)(struct ath10k *ar);
329 };
330 
331 struct ath10k_htc_ep_ops {
332 	void (*ep_tx_complete)(struct ath10k *, struct sk_buff *);
333 	void (*ep_rx_complete)(struct ath10k *, struct sk_buff *);
334 	void (*ep_tx_credits)(struct ath10k *);
335 };
336 
337 /* service connection information */
338 struct ath10k_htc_svc_conn_req {
339 	u16 service_id;
340 	struct ath10k_htc_ep_ops ep_ops;
341 	int max_send_queue_depth;
342 };
343 
344 /* service connection response information */
345 struct ath10k_htc_svc_conn_resp {
346 	u8 buffer_len;
347 	u8 actual_len;
348 	enum ath10k_htc_ep_id eid;
349 	unsigned int max_msg_len;
350 	u8 connect_resp_code;
351 };
352 
353 #define ATH10K_NUM_CONTROL_TX_BUFFERS 2
354 #define ATH10K_HTC_MAX_LEN 4096
355 #define ATH10K_HTC_MAX_CTRL_MSG_LEN 256
356 #define ATH10K_HTC_WAIT_TIMEOUT_HZ (1 * HZ)
357 #define ATH10K_HTC_CONTROL_BUFFER_SIZE (ATH10K_HTC_MAX_CTRL_MSG_LEN + \
358 					sizeof(struct ath10k_htc_hdr))
359 #define ATH10K_HTC_CONN_SVC_TIMEOUT_HZ (1 * HZ)
360 
361 struct ath10k_htc_ep {
362 	struct ath10k_htc *htc;
363 	enum ath10k_htc_ep_id eid;
364 	enum ath10k_htc_svc_id service_id;
365 	struct ath10k_htc_ep_ops ep_ops;
366 
367 	int max_tx_queue_depth;
368 	int max_ep_message_len;
369 	u8 ul_pipe_id;
370 	u8 dl_pipe_id;
371 
372 	u8 seq_no; /* for debugging */
373 	int tx_credits;
374 	int tx_credit_size;
375 	bool tx_credit_flow_enabled;
376 	bool bundle_tx;
377 	struct sk_buff_head tx_req_head;
378 	struct sk_buff_head tx_complete_head;
379 
380 };
381 
382 struct ath10k_htc_svc_tx_credits {
383 	u16 service_id;
384 	u8  credit_allocation;
385 };
386 
387 struct ath10k_htc {
388 	struct ath10k *ar;
389 	struct ath10k_htc_ep endpoint[ATH10K_HTC_EP_COUNT];
390 
391 	/* protects endpoints */
392 	spinlock_t tx_lock;
393 
394 	struct ath10k_htc_ops htc_ops;
395 
396 	u8 control_resp_buffer[ATH10K_HTC_MAX_CTRL_MSG_LEN];
397 	int control_resp_len;
398 
399 	struct completion ctl_resp;
400 
401 	int total_transmit_credits;
402 	int target_credit_size;
403 	u8 max_msgs_per_htc_bundle;
404 	int alt_data_credit_size;
405 };
406 
407 int ath10k_htc_init(struct ath10k *ar);
408 int ath10k_htc_wait_target(struct ath10k_htc *htc);
409 void ath10k_htc_setup_tx_req(struct ath10k_htc_ep *ep);
410 int ath10k_htc_start(struct ath10k_htc *htc);
411 int ath10k_htc_connect_service(struct ath10k_htc *htc,
412 			       struct ath10k_htc_svc_conn_req  *conn_req,
413 			       struct ath10k_htc_svc_conn_resp *conn_resp);
414 void ath10k_htc_change_tx_credit_flow(struct ath10k_htc *htc,
415 				      enum ath10k_htc_ep_id eid,
416 				      bool enable);
417 int ath10k_htc_send(struct ath10k_htc *htc, enum ath10k_htc_ep_id eid,
418 		    struct sk_buff *packet);
419 void ath10k_htc_stop_hl(struct ath10k *ar);
420 
421 int ath10k_htc_send_hl(struct ath10k_htc *htc, enum ath10k_htc_ep_id eid,
422 		       struct sk_buff *packet);
423 struct sk_buff *ath10k_htc_alloc_skb(struct ath10k *ar, int size);
424 void ath10k_htc_tx_completion_handler(struct ath10k *ar, struct sk_buff *skb);
425 void ath10k_htc_rx_completion_handler(struct ath10k *ar, struct sk_buff *skb);
426 void ath10k_htc_notify_tx_completion(struct ath10k_htc_ep *ep,
427 				     struct sk_buff *skb);
428 int ath10k_htc_process_trailer(struct ath10k_htc *htc,
429 			       u8 *buffer,
430 			       int length,
431 			       enum ath10k_htc_ep_id src_eid,
432 			       void *next_lookaheads,
433 			       int *next_lookaheads_len);
434 
435 #endif
436