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1// SPDX-License-Identifier: GPL-2.0
2
3/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
4 * Copyright (C) 2018-2020 Linaro Ltd.
5 */
6
7#include <linux/types.h>
8#include <linux/string.h>
9#include <linux/slab.h>
10#include <linux/qrtr.h>
11#include <linux/soc/qcom/qmi.h>
12
13#include "ipa.h"
14#include "ipa_endpoint.h"
15#include "ipa_mem.h"
16#include "ipa_table.h"
17#include "ipa_modem.h"
18#include "ipa_qmi_msg.h"
19
20/**
21 * DOC: AP/Modem QMI Handshake
22 *
23 * The AP and modem perform a "handshake" at initialization time to ensure
24 * both sides know when everything is ready to begin operating. The AP
25 * driver (this code) uses two QMI handles (endpoints) for this; a client
26 * using a service on the modem, and server to service modem requests (and
27 * to supply an indication message from the AP). Once the handshake is
28 * complete, the AP and modem may begin IPA operation. This occurs
29 * only when the AP IPA driver, modem IPA driver, and IPA microcontroller
30 * are ready.
31 *
32 * The QMI service on the modem expects to receive an INIT_DRIVER request from
33 * the AP, which contains parameters used by the modem during initialization.
34 * The AP sends this request as soon as it is knows the modem side service
35 * is available. The modem responds to this request, and if this response
36 * contains a success result, the AP knows the modem IPA driver is ready.
37 *
38 * The modem is responsible for loading firmware on the IPA microcontroller.
39 * This occurs only during the initial modem boot. The modem sends a
40 * separate DRIVER_INIT_COMPLETE request to the AP to report that the
41 * microcontroller is ready. The AP may assume the microcontroller is
42 * ready and remain so (even if the modem reboots) once it has received
43 * and responded to this request.
44 *
45 * There is one final exchange involved in the handshake. It is required
46 * on the initial modem boot, but optional (but in practice does occur) on
47 * subsequent boots. The modem expects to receive a final INIT_COMPLETE
48 * indication message from the AP when it is about to begin its normal
49 * operation. The AP will only send this message after it has received
50 * and responded to an INDICATION_REGISTER request from the modem.
51 *
52 * So in summary:
53 * - Whenever the AP learns the modem has booted and its IPA QMI service
54 * is available, it sends an INIT_DRIVER request to the modem. The
55 * modem supplies a success response when it is ready to operate.
56 * - On the initial boot, the modem sets up the IPA microcontroller, and
57 * sends a DRIVER_INIT_COMPLETE request to the AP when this is done.
58 * - When the modem is ready to receive an INIT_COMPLETE indication from
59 * the AP, it sends an INDICATION_REGISTER request to the AP.
60 * - On the initial modem boot, everything is ready when:
61 * - AP has received a success response from its INIT_DRIVER request
62 * - AP has responded to a DRIVER_INIT_COMPLETE request
63 * - AP has responded to an INDICATION_REGISTER request from the modem
64 * - AP has sent an INIT_COMPLETE indication to the modem
65 * - On subsequent modem boots, everything is ready when:
66 * - AP has received a success response from its INIT_DRIVER request
67 * - AP has responded to a DRIVER_INIT_COMPLETE request
68 * - The INDICATION_REGISTER request and INIT_COMPLETE indication are
69 * optional for non-initial modem boots, and have no bearing on the
70 * determination of when things are "ready"
71 */
72
73#define IPA_HOST_SERVICE_SVC_ID 0x31
74#define IPA_HOST_SVC_VERS 1
75#define IPA_HOST_SERVICE_INS_ID 1
76
77#define IPA_MODEM_SERVICE_SVC_ID 0x31
78#define IPA_MODEM_SERVICE_INS_ID 2
79#define IPA_MODEM_SVC_VERS 1
80
81#define QMI_INIT_DRIVER_TIMEOUT 60000 /* A minute in milliseconds */
82
83/* Send an INIT_COMPLETE indication message to the modem */
84static void ipa_server_init_complete(struct ipa_qmi *ipa_qmi)
85{
86 struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi);
87 struct qmi_handle *qmi = &ipa_qmi->server_handle;
88 struct sockaddr_qrtr *sq = &ipa_qmi->modem_sq;
89 struct ipa_init_complete_ind ind = { };
90 int ret;
91
92 ind.status.result = QMI_RESULT_SUCCESS_V01;
93 ind.status.error = QMI_ERR_NONE_V01;
94
95 ret = qmi_send_indication(qmi, sq, IPA_QMI_INIT_COMPLETE,
96 IPA_QMI_INIT_COMPLETE_IND_SZ,
97 ipa_init_complete_ind_ei, &ind);
98 if (ret)
99 dev_err(&ipa->pdev->dev,
100 "error %d sending init complete indication\n", ret);
101 else
102 ipa_qmi->indication_sent = true;
103}
104
105/* If requested (and not already sent) send the INIT_COMPLETE indication */
106static void ipa_qmi_indication(struct ipa_qmi *ipa_qmi)
107{
108 if (!ipa_qmi->indication_requested)
109 return;
110
111 if (ipa_qmi->indication_sent)
112 return;
113
114 ipa_server_init_complete(ipa_qmi);
115}
116
117/* Determine whether everything is ready to start normal operation.
118 * We know everything (else) is ready when we know the IPA driver on
119 * the modem is ready, and the microcontroller is ready.
120 *
121 * When the modem boots (or reboots), the handshake sequence starts
122 * with the AP sending the modem an INIT_DRIVER request. Within
123 * that request, the uc_loaded flag will be zero (false) for an
124 * initial boot, non-zero (true) for a subsequent (SSR) boot.
125 */
126static void ipa_qmi_ready(struct ipa_qmi *ipa_qmi)
127{
128 struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi);
129 int ret;
130
131 /* We aren't ready until the modem and microcontroller are */
132 if (!ipa_qmi->modem_ready || !ipa_qmi->uc_ready)
133 return;
134
135 /* Send the indication message if it was requested */
136 ipa_qmi_indication(ipa_qmi);
137
138 /* The initial boot requires us to send the indication. */
139 if (ipa_qmi->initial_boot) {
140 if (!ipa_qmi->indication_sent)
141 return;
142
143 /* The initial modem boot completed successfully */
144 ipa_qmi->initial_boot = false;
145 }
146
147 /* We're ready. Start up normal operation */
148 ipa = container_of(ipa_qmi, struct ipa, qmi);
149 ret = ipa_modem_start(ipa);
150 if (ret)
151 dev_err(&ipa->pdev->dev, "error %d starting modem\n", ret);
152}
153
154/* All QMI clients from the modem node are gone (modem shut down or crashed). */
155static void ipa_server_bye(struct qmi_handle *qmi, unsigned int node)
156{
157 struct ipa_qmi *ipa_qmi;
158
159 ipa_qmi = container_of(qmi, struct ipa_qmi, server_handle);
160
161 /* The modem client and server go away at the same time */
162 memset(&ipa_qmi->modem_sq, 0, sizeof(ipa_qmi->modem_sq));
163
164 /* initial_boot doesn't change when modem reboots */
165 /* uc_ready doesn't change when modem reboots */
166 ipa_qmi->modem_ready = false;
167 ipa_qmi->indication_requested = false;
168 ipa_qmi->indication_sent = false;
169}
170
171static const struct qmi_ops ipa_server_ops = {
172 .bye = ipa_server_bye,
173};
174
175/* Callback function to handle an INDICATION_REGISTER request message from the
176 * modem. This informs the AP that the modem is now ready to receive the
177 * INIT_COMPLETE indication message.
178 */
179static void ipa_server_indication_register(struct qmi_handle *qmi,
180 struct sockaddr_qrtr *sq,
181 struct qmi_txn *txn,
182 const void *decoded)
183{
184 struct ipa_indication_register_rsp rsp = { };
185 struct ipa_qmi *ipa_qmi;
186 struct ipa *ipa;
187 int ret;
188
189 ipa_qmi = container_of(qmi, struct ipa_qmi, server_handle);
190 ipa = container_of(ipa_qmi, struct ipa, qmi);
191
192 rsp.rsp.result = QMI_RESULT_SUCCESS_V01;
193 rsp.rsp.error = QMI_ERR_NONE_V01;
194
195 ret = qmi_send_response(qmi, sq, txn, IPA_QMI_INDICATION_REGISTER,
196 IPA_QMI_INDICATION_REGISTER_RSP_SZ,
197 ipa_indication_register_rsp_ei, &rsp);
198 if (!ret) {
199 ipa_qmi->indication_requested = true;
200 ipa_qmi_ready(ipa_qmi); /* We might be ready now */
201 } else {
202 dev_err(&ipa->pdev->dev,
203 "error %d sending register indication response\n", ret);
204 }
205}
206
207/* Respond to a DRIVER_INIT_COMPLETE request message from the modem. */
208static void ipa_server_driver_init_complete(struct qmi_handle *qmi,
209 struct sockaddr_qrtr *sq,
210 struct qmi_txn *txn,
211 const void *decoded)
212{
213 struct ipa_driver_init_complete_rsp rsp = { };
214 struct ipa_qmi *ipa_qmi;
215 struct ipa *ipa;
216 int ret;
217
218 ipa_qmi = container_of(qmi, struct ipa_qmi, server_handle);
219 ipa = container_of(ipa_qmi, struct ipa, qmi);
220
221 rsp.rsp.result = QMI_RESULT_SUCCESS_V01;
222 rsp.rsp.error = QMI_ERR_NONE_V01;
223
224 ret = qmi_send_response(qmi, sq, txn, IPA_QMI_DRIVER_INIT_COMPLETE,
225 IPA_QMI_DRIVER_INIT_COMPLETE_RSP_SZ,
226 ipa_driver_init_complete_rsp_ei, &rsp);
227 if (!ret) {
228 ipa_qmi->uc_ready = true;
229 ipa_qmi_ready(ipa_qmi); /* We might be ready now */
230 } else {
231 dev_err(&ipa->pdev->dev,
232 "error %d sending init complete response\n", ret);
233 }
234}
235
236/* The server handles two request message types sent by the modem. */
237static const struct qmi_msg_handler ipa_server_msg_handlers[] = {
238 {
239 .type = QMI_REQUEST,
240 .msg_id = IPA_QMI_INDICATION_REGISTER,
241 .ei = ipa_indication_register_req_ei,
242 .decoded_size = IPA_QMI_INDICATION_REGISTER_REQ_SZ,
243 .fn = ipa_server_indication_register,
244 },
245 {
246 .type = QMI_REQUEST,
247 .msg_id = IPA_QMI_DRIVER_INIT_COMPLETE,
248 .ei = ipa_driver_init_complete_req_ei,
249 .decoded_size = IPA_QMI_DRIVER_INIT_COMPLETE_REQ_SZ,
250 .fn = ipa_server_driver_init_complete,
251 },
252 { },
253};
254
255/* Handle an INIT_DRIVER response message from the modem. */
256static void ipa_client_init_driver(struct qmi_handle *qmi,
257 struct sockaddr_qrtr *sq,
258 struct qmi_txn *txn, const void *decoded)
259{
260 txn->result = 0; /* IPA_QMI_INIT_DRIVER request was successful */
261 complete(&txn->completion);
262}
263
264/* The client handles one response message type sent by the modem. */
265static const struct qmi_msg_handler ipa_client_msg_handlers[] = {
266 {
267 .type = QMI_RESPONSE,
268 .msg_id = IPA_QMI_INIT_DRIVER,
269 .ei = ipa_init_modem_driver_rsp_ei,
270 .decoded_size = IPA_QMI_INIT_DRIVER_RSP_SZ,
271 .fn = ipa_client_init_driver,
272 },
273 { },
274};
275
276/* Return a pointer to an init modem driver request structure, which contains
277 * configuration parameters for the modem. The modem may be started multiple
278 * times, but generally these parameters don't change so we can reuse the
279 * request structure once it's initialized. The only exception is the
280 * skip_uc_load field, which will be set only after the microcontroller has
281 * reported it has completed its initialization.
282 */
283static const struct ipa_init_modem_driver_req *
284init_modem_driver_req(struct ipa_qmi *ipa_qmi)
285{
286 struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi);
287 static struct ipa_init_modem_driver_req req;
288 const struct ipa_mem *mem;
289
290 /* The microcontroller is initialized on the first boot */
291 req.skip_uc_load_valid = 1;
292 req.skip_uc_load = ipa->uc_loaded ? 1 : 0;
293
294 /* We only have to initialize most of it once */
295 if (req.platform_type_valid)
296 return &req;
297
298 req.platform_type_valid = 1;
299 req.platform_type = IPA_QMI_PLATFORM_TYPE_MSM_ANDROID;
300
301 mem = ipa_mem_find(ipa, IPA_MEM_MODEM_HEADER);
302 if (mem->size) {
303 req.hdr_tbl_info_valid = 1;
304 req.hdr_tbl_info.start = ipa->mem_offset + mem->offset;
305 req.hdr_tbl_info.end = req.hdr_tbl_info.start + mem->size - 1;
306 }
307
308 mem = ipa_mem_find(ipa, IPA_MEM_V4_ROUTE);
309 req.v4_route_tbl_info_valid = 1;
310 req.v4_route_tbl_info.start = ipa->mem_offset + mem->offset;
311 req.v4_route_tbl_info.count = mem->size / sizeof(__le64);
312
313 mem = ipa_mem_find(ipa, IPA_MEM_V6_ROUTE);
314 req.v6_route_tbl_info_valid = 1;
315 req.v6_route_tbl_info.start = ipa->mem_offset + mem->offset;
316 req.v6_route_tbl_info.count = mem->size / sizeof(__le64);
317
318 mem = ipa_mem_find(ipa, IPA_MEM_V4_FILTER);
319 req.v4_filter_tbl_start_valid = 1;
320 req.v4_filter_tbl_start = ipa->mem_offset + mem->offset;
321
322 mem = ipa_mem_find(ipa, IPA_MEM_V6_FILTER);
323 req.v6_filter_tbl_start_valid = 1;
324 req.v6_filter_tbl_start = ipa->mem_offset + mem->offset;
325
326 mem = ipa_mem_find(ipa, IPA_MEM_MODEM);
327 if (mem->size) {
328 req.modem_mem_info_valid = 1;
329 req.modem_mem_info.start = ipa->mem_offset + mem->offset;
330 req.modem_mem_info.size = mem->size;
331 }
332
333 req.ctrl_comm_dest_end_pt_valid = 1;
334 req.ctrl_comm_dest_end_pt =
335 ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->endpoint_id;
336
337 /* skip_uc_load_valid and skip_uc_load are set above */
338
339 mem = ipa_mem_find(ipa, IPA_MEM_MODEM_PROC_CTX);
340 if (mem->size) {
341 req.hdr_proc_ctx_tbl_info_valid = 1;
342 req.hdr_proc_ctx_tbl_info.start =
343 ipa->mem_offset + mem->offset;
344 req.hdr_proc_ctx_tbl_info.end =
345 req.hdr_proc_ctx_tbl_info.start + mem->size - 1;
346 }
347
348 /* Nothing to report for the compression table (zip_tbl_info) */
349
350 mem = ipa_mem_find(ipa, IPA_MEM_V4_ROUTE_HASHED);
351 if (mem->size) {
352 req.v4_hash_route_tbl_info_valid = 1;
353 req.v4_hash_route_tbl_info.start =
354 ipa->mem_offset + mem->offset;
355 req.v4_hash_route_tbl_info.count = mem->size / sizeof(__le64);
356 }
357
358 mem = ipa_mem_find(ipa, IPA_MEM_V6_ROUTE_HASHED);
359 if (mem->size) {
360 req.v6_hash_route_tbl_info_valid = 1;
361 req.v6_hash_route_tbl_info.start =
362 ipa->mem_offset + mem->offset;
363 req.v6_hash_route_tbl_info.count = mem->size / sizeof(__le64);
364 }
365
366 mem = ipa_mem_find(ipa, IPA_MEM_V4_FILTER_HASHED);
367 if (mem->size) {
368 req.v4_hash_filter_tbl_start_valid = 1;
369 req.v4_hash_filter_tbl_start = ipa->mem_offset + mem->offset;
370 }
371
372 mem = ipa_mem_find(ipa, IPA_MEM_V6_FILTER_HASHED);
373 if (mem->size) {
374 req.v6_hash_filter_tbl_start_valid = 1;
375 req.v6_hash_filter_tbl_start = ipa->mem_offset + mem->offset;
376 }
377
378 /* The stats fields are only valid for IPA v4.0+ */
379 if (ipa->version >= IPA_VERSION_4_0) {
380 mem = ipa_mem_find(ipa, IPA_MEM_STATS_QUOTA_MODEM);
381 if (mem->size) {
382 req.hw_stats_quota_base_addr_valid = 1;
383 req.hw_stats_quota_base_addr =
384 ipa->mem_offset + mem->offset;
385 req.hw_stats_quota_size_valid = 1;
386 req.hw_stats_quota_size = ipa->mem_offset + mem->size;
387 }
388
389 /* If the DROP stats region is defined, include it */
390 mem = ipa_mem_find(ipa, IPA_MEM_STATS_DROP);
391 if (mem && mem->size) {
392 req.hw_stats_drop_base_addr_valid = 1;
393 req.hw_stats_drop_base_addr =
394 ipa->mem_offset + mem->offset;
395 req.hw_stats_drop_size_valid = 1;
396 req.hw_stats_drop_size = ipa->mem_offset + mem->size;
397 }
398 }
399
400 return &req;
401}
402
403/* Send an INIT_DRIVER request to the modem, and wait for it to complete. */
404static void ipa_client_init_driver_work(struct work_struct *work)
405{
406 unsigned long timeout = msecs_to_jiffies(QMI_INIT_DRIVER_TIMEOUT);
407 const struct ipa_init_modem_driver_req *req;
408 struct ipa_qmi *ipa_qmi;
409 struct qmi_handle *qmi;
410 struct qmi_txn txn;
411 struct device *dev;
412 struct ipa *ipa;
413 int ret;
414
415 ipa_qmi = container_of(work, struct ipa_qmi, init_driver_work);
416 qmi = &ipa_qmi->client_handle;
417
418 ipa = container_of(ipa_qmi, struct ipa, qmi);
419 dev = &ipa->pdev->dev;
420
421 ret = qmi_txn_init(qmi, &txn, NULL, NULL);
422 if (ret < 0) {
423 dev_err(dev, "error %d preparing init driver request\n", ret);
424 return;
425 }
426
427 /* Send the request, and if successful wait for its response */
428 req = init_modem_driver_req(ipa_qmi);
429 ret = qmi_send_request(qmi, &ipa_qmi->modem_sq, &txn,
430 IPA_QMI_INIT_DRIVER, IPA_QMI_INIT_DRIVER_REQ_SZ,
431 ipa_init_modem_driver_req_ei, req);
432 if (ret)
433 dev_err(dev, "error %d sending init driver request\n", ret);
434 else if ((ret = qmi_txn_wait(&txn, timeout)))
435 dev_err(dev, "error %d awaiting init driver response\n", ret);
436
437 if (!ret) {
438 ipa_qmi->modem_ready = true;
439 ipa_qmi_ready(ipa_qmi); /* We might be ready now */
440 } else {
441 /* If any error occurs we need to cancel the transaction */
442 qmi_txn_cancel(&txn);
443 }
444}
445
446/* The modem server is now available. We will send an INIT_DRIVER request
447 * to the modem, but can't wait for it to complete in this callback thread.
448 * Schedule a worker on the global workqueue to do that for us.
449 */
450static int
451ipa_client_new_server(struct qmi_handle *qmi, struct qmi_service *svc)
452{
453 struct ipa_qmi *ipa_qmi;
454
455 ipa_qmi = container_of(qmi, struct ipa_qmi, client_handle);
456
457 ipa_qmi->modem_sq.sq_family = AF_QIPCRTR;
458 ipa_qmi->modem_sq.sq_node = svc->node;
459 ipa_qmi->modem_sq.sq_port = svc->port;
460
461 schedule_work(&ipa_qmi->init_driver_work);
462
463 return 0;
464}
465
466static const struct qmi_ops ipa_client_ops = {
467 .new_server = ipa_client_new_server,
468};
469
470/* This is called by ipa_setup(). We can be informed via remoteproc that
471 * the modem has shut down, in which case this function will be called
472 * again to prepare for it coming back up again.
473 */
474int ipa_qmi_setup(struct ipa *ipa)
475{
476 struct ipa_qmi *ipa_qmi = &ipa->qmi;
477 int ret;
478
479 ipa_qmi->initial_boot = true;
480
481 /* The server handle is used to handle the DRIVER_INIT_COMPLETE
482 * request on the first modem boot. It also receives the
483 * INDICATION_REGISTER request on the first boot and (optionally)
484 * subsequent boots. The INIT_COMPLETE indication message is
485 * sent over the server handle if requested.
486 */
487 ret = qmi_handle_init(&ipa_qmi->server_handle,
488 IPA_QMI_SERVER_MAX_RCV_SZ, &ipa_server_ops,
489 ipa_server_msg_handlers);
490 if (ret)
491 return ret;
492
493 ret = qmi_add_server(&ipa_qmi->server_handle, IPA_HOST_SERVICE_SVC_ID,
494 IPA_HOST_SVC_VERS, IPA_HOST_SERVICE_INS_ID);
495 if (ret)
496 goto err_server_handle_release;
497
498 /* The client handle is only used for sending an INIT_DRIVER request
499 * to the modem, and receiving its response message.
500 */
501 ret = qmi_handle_init(&ipa_qmi->client_handle,
502 IPA_QMI_CLIENT_MAX_RCV_SZ, &ipa_client_ops,
503 ipa_client_msg_handlers);
504 if (ret)
505 goto err_server_handle_release;
506
507 /* We need this ready before the service lookup is added */
508 INIT_WORK(&ipa_qmi->init_driver_work, ipa_client_init_driver_work);
509
510 ret = qmi_add_lookup(&ipa_qmi->client_handle, IPA_MODEM_SERVICE_SVC_ID,
511 IPA_MODEM_SVC_VERS, IPA_MODEM_SERVICE_INS_ID);
512 if (ret)
513 goto err_client_handle_release;
514
515 return 0;
516
517err_client_handle_release:
518 /* Releasing the handle also removes registered lookups */
519 qmi_handle_release(&ipa_qmi->client_handle);
520 memset(&ipa_qmi->client_handle, 0, sizeof(ipa_qmi->client_handle));
521err_server_handle_release:
522 /* Releasing the handle also removes registered services */
523 qmi_handle_release(&ipa_qmi->server_handle);
524 memset(&ipa_qmi->server_handle, 0, sizeof(ipa_qmi->server_handle));
525
526 return ret;
527}
528
529void ipa_qmi_teardown(struct ipa *ipa)
530{
531 cancel_work_sync(&ipa->qmi.init_driver_work);
532
533 qmi_handle_release(&ipa->qmi.client_handle);
534 memset(&ipa->qmi.client_handle, 0, sizeof(ipa->qmi.client_handle));
535
536 qmi_handle_release(&ipa->qmi.server_handle);
537 memset(&ipa->qmi.server_handle, 0, sizeof(ipa->qmi.server_handle));
538}