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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Qualcomm Peripheral Image Loader helpers
4 *
5 * Copyright (C) 2016 Linaro Ltd
6 * Copyright (C) 2015 Sony Mobile Communications Inc
7 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
8 */
9
10#include <linux/firmware.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/notifier.h>
14#include <linux/remoteproc.h>
15#include <linux/remoteproc/qcom_rproc.h>
16#include <linux/rpmsg/qcom_glink.h>
17#include <linux/rpmsg/qcom_smd.h>
18#include <linux/slab.h>
19#include <linux/soc/qcom/mdt_loader.h>
20#include <linux/soc/qcom/smem.h>
21
22#include "remoteproc_internal.h"
23#include "qcom_common.h"
24
25#define to_glink_subdev(d) container_of(d, struct qcom_rproc_glink, subdev)
26#define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
27#define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)
28
29#define MAX_NUM_OF_SS 10
30#define MAX_REGION_NAME_LENGTH 16
31#define SBL_MINIDUMP_SMEM_ID 602
32#define MINIDUMP_REGION_VALID ('V' << 24 | 'A' << 16 | 'L' << 8 | 'I' << 0)
33#define MINIDUMP_SS_ENCR_DONE ('D' << 24 | 'O' << 16 | 'N' << 8 | 'E' << 0)
34#define MINIDUMP_SS_ENABLED ('E' << 24 | 'N' << 16 | 'B' << 8 | 'L' << 0)
35
36/**
37 * struct minidump_region - Minidump region
38 * @name : Name of the region to be dumped
39 * @seq_num: : Use to differentiate regions with same name.
40 * @valid : This entry to be dumped (if set to 1)
41 * @address : Physical address of region to be dumped
42 * @size : Size of the region
43 */
44struct minidump_region {
45 char name[MAX_REGION_NAME_LENGTH];
46 __le32 seq_num;
47 __le32 valid;
48 __le64 address;
49 __le64 size;
50};
51
52/**
53 * struct minidump_subsystem - Subsystem's SMEM Table of content
54 * @status : Subsystem toc init status
55 * @enabled : if set to 1, this region would be copied during coredump
56 * @encryption_status: Encryption status for this subsystem
57 * @encryption_required : Decides to encrypt the subsystem regions or not
58 * @region_count : Number of regions added in this subsystem toc
59 * @regions_baseptr : regions base pointer of the subsystem
60 */
61struct minidump_subsystem {
62 __le32 status;
63 __le32 enabled;
64 __le32 encryption_status;
65 __le32 encryption_required;
66 __le32 region_count;
67 __le64 regions_baseptr;
68};
69
70/**
71 * struct minidump_global_toc - Global Table of Content
72 * @status : Global Minidump init status
73 * @md_revision : Minidump revision
74 * @enabled : Minidump enable status
75 * @subsystems : Array of subsystems toc
76 */
77struct minidump_global_toc {
78 __le32 status;
79 __le32 md_revision;
80 __le32 enabled;
81 struct minidump_subsystem subsystems[MAX_NUM_OF_SS];
82};
83
84struct qcom_ssr_subsystem {
85 const char *name;
86 struct srcu_notifier_head notifier_list;
87 struct list_head list;
88};
89
90static LIST_HEAD(qcom_ssr_subsystem_list);
91static DEFINE_MUTEX(qcom_ssr_subsys_lock);
92
93static void qcom_minidump_cleanup(struct rproc *rproc)
94{
95 struct rproc_dump_segment *entry, *tmp;
96
97 list_for_each_entry_safe(entry, tmp, &rproc->dump_segments, node) {
98 list_del(&entry->node);
99 kfree(entry->priv);
100 kfree(entry);
101 }
102}
103
104static int qcom_add_minidump_segments(struct rproc *rproc, struct minidump_subsystem *subsystem,
105 void (*rproc_dumpfn_t)(struct rproc *rproc, struct rproc_dump_segment *segment,
106 void *dest, size_t offset, size_t size))
107{
108 struct minidump_region __iomem *ptr;
109 struct minidump_region region;
110 int seg_cnt, i;
111 dma_addr_t da;
112 size_t size;
113 char *name;
114
115 if (WARN_ON(!list_empty(&rproc->dump_segments))) {
116 dev_err(&rproc->dev, "dump segment list already populated\n");
117 return -EUCLEAN;
118 }
119
120 seg_cnt = le32_to_cpu(subsystem->region_count);
121 ptr = ioremap((unsigned long)le64_to_cpu(subsystem->regions_baseptr),
122 seg_cnt * sizeof(struct minidump_region));
123 if (!ptr)
124 return -EFAULT;
125
126 for (i = 0; i < seg_cnt; i++) {
127 memcpy_fromio(®ion, ptr + i, sizeof(region));
128 if (le32_to_cpu(region.valid) == MINIDUMP_REGION_VALID) {
129 name = kstrndup(region.name, MAX_REGION_NAME_LENGTH - 1, GFP_KERNEL);
130 if (!name) {
131 iounmap(ptr);
132 return -ENOMEM;
133 }
134 da = le64_to_cpu(region.address);
135 size = le64_to_cpu(region.size);
136 rproc_coredump_add_custom_segment(rproc, da, size, rproc_dumpfn_t, name);
137 }
138 }
139
140 iounmap(ptr);
141 return 0;
142}
143
144void qcom_minidump(struct rproc *rproc, unsigned int minidump_id,
145 void (*rproc_dumpfn_t)(struct rproc *rproc,
146 struct rproc_dump_segment *segment, void *dest, size_t offset,
147 size_t size))
148{
149 int ret;
150 struct minidump_subsystem *subsystem;
151 struct minidump_global_toc *toc;
152
153 /* Get Global minidump ToC*/
154 toc = qcom_smem_get(QCOM_SMEM_HOST_ANY, SBL_MINIDUMP_SMEM_ID, NULL);
155
156 /* check if global table pointer exists and init is set */
157 if (IS_ERR(toc) || !toc->status) {
158 dev_err(&rproc->dev, "Minidump TOC not found in SMEM\n");
159 return;
160 }
161
162 /* Get subsystem table of contents using the minidump id */
163 subsystem = &toc->subsystems[minidump_id];
164
165 /**
166 * Collect minidump if SS ToC is valid and segment table
167 * is initialized in memory and encryption status is set.
168 */
169 if (subsystem->regions_baseptr == 0 ||
170 le32_to_cpu(subsystem->status) != 1 ||
171 le32_to_cpu(subsystem->enabled) != MINIDUMP_SS_ENABLED) {
172 return rproc_coredump(rproc);
173 }
174
175 if (le32_to_cpu(subsystem->encryption_status) != MINIDUMP_SS_ENCR_DONE) {
176 dev_err(&rproc->dev, "Minidump not ready, skipping\n");
177 return;
178 }
179
180 /**
181 * Clear out the dump segments populated by parse_fw before
182 * re-populating them with minidump segments.
183 */
184 rproc_coredump_cleanup(rproc);
185
186 ret = qcom_add_minidump_segments(rproc, subsystem, rproc_dumpfn_t);
187 if (ret) {
188 dev_err(&rproc->dev, "Failed with error: %d while adding minidump entries\n", ret);
189 goto clean_minidump;
190 }
191 rproc_coredump_using_sections(rproc);
192clean_minidump:
193 qcom_minidump_cleanup(rproc);
194}
195EXPORT_SYMBOL_GPL(qcom_minidump);
196
197static int glink_subdev_start(struct rproc_subdev *subdev)
198{
199 struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
200
201 glink->edge = qcom_glink_smem_register(glink->dev, glink->node);
202
203 return PTR_ERR_OR_ZERO(glink->edge);
204}
205
206static void glink_subdev_stop(struct rproc_subdev *subdev, bool crashed)
207{
208 struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
209
210 qcom_glink_smem_unregister(glink->edge);
211 glink->edge = NULL;
212}
213
214static void glink_subdev_unprepare(struct rproc_subdev *subdev)
215{
216 struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
217
218 qcom_glink_ssr_notify(glink->ssr_name);
219}
220
221/**
222 * qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc
223 * @rproc: rproc handle to parent the subdevice
224 * @glink: reference to a GLINK subdev context
225 * @ssr_name: identifier of the associated remoteproc for ssr notifications
226 */
227void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink,
228 const char *ssr_name)
229{
230 struct device *dev = &rproc->dev;
231
232 glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge");
233 if (!glink->node)
234 return;
235
236 glink->ssr_name = kstrdup_const(ssr_name, GFP_KERNEL);
237 if (!glink->ssr_name)
238 return;
239
240 glink->dev = dev;
241 glink->subdev.start = glink_subdev_start;
242 glink->subdev.stop = glink_subdev_stop;
243 glink->subdev.unprepare = glink_subdev_unprepare;
244
245 rproc_add_subdev(rproc, &glink->subdev);
246}
247EXPORT_SYMBOL_GPL(qcom_add_glink_subdev);
248
249/**
250 * qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc
251 * @rproc: rproc handle
252 * @glink: reference to a GLINK subdev context
253 */
254void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
255{
256 if (!glink->node)
257 return;
258
259 rproc_remove_subdev(rproc, &glink->subdev);
260 kfree_const(glink->ssr_name);
261 of_node_put(glink->node);
262}
263EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);
264
265/**
266 * qcom_register_dump_segments() - register segments for coredump
267 * @rproc: remoteproc handle
268 * @fw: firmware header
269 *
270 * Register all segments of the ELF in the remoteproc coredump segment list
271 *
272 * Return: 0 on success, negative errno on failure.
273 */
274int qcom_register_dump_segments(struct rproc *rproc,
275 const struct firmware *fw)
276{
277 const struct elf32_phdr *phdrs;
278 const struct elf32_phdr *phdr;
279 const struct elf32_hdr *ehdr;
280 int ret;
281 int i;
282
283 ehdr = (struct elf32_hdr *)fw->data;
284 phdrs = (struct elf32_phdr *)(ehdr + 1);
285
286 for (i = 0; i < ehdr->e_phnum; i++) {
287 phdr = &phdrs[i];
288
289 if (phdr->p_type != PT_LOAD)
290 continue;
291
292 if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
293 continue;
294
295 if (!phdr->p_memsz)
296 continue;
297
298 ret = rproc_coredump_add_segment(rproc, phdr->p_paddr,
299 phdr->p_memsz);
300 if (ret)
301 return ret;
302 }
303
304 return 0;
305}
306EXPORT_SYMBOL_GPL(qcom_register_dump_segments);
307
308static int smd_subdev_start(struct rproc_subdev *subdev)
309{
310 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
311
312 smd->edge = qcom_smd_register_edge(smd->dev, smd->node);
313
314 return PTR_ERR_OR_ZERO(smd->edge);
315}
316
317static void smd_subdev_stop(struct rproc_subdev *subdev, bool crashed)
318{
319 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
320
321 qcom_smd_unregister_edge(smd->edge);
322 smd->edge = NULL;
323}
324
325/**
326 * qcom_add_smd_subdev() - try to add a SMD subdevice to rproc
327 * @rproc: rproc handle to parent the subdevice
328 * @smd: reference to a Qualcomm subdev context
329 */
330void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
331{
332 struct device *dev = &rproc->dev;
333
334 smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge");
335 if (!smd->node)
336 return;
337
338 smd->dev = dev;
339 smd->subdev.start = smd_subdev_start;
340 smd->subdev.stop = smd_subdev_stop;
341
342 rproc_add_subdev(rproc, &smd->subdev);
343}
344EXPORT_SYMBOL_GPL(qcom_add_smd_subdev);
345
346/**
347 * qcom_remove_smd_subdev() - remove the smd subdevice from rproc
348 * @rproc: rproc handle
349 * @smd: the SMD subdevice to remove
350 */
351void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
352{
353 if (!smd->node)
354 return;
355
356 rproc_remove_subdev(rproc, &smd->subdev);
357 of_node_put(smd->node);
358}
359EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
360
361static struct qcom_ssr_subsystem *qcom_ssr_get_subsys(const char *name)
362{
363 struct qcom_ssr_subsystem *info;
364
365 mutex_lock(&qcom_ssr_subsys_lock);
366 /* Match in the global qcom_ssr_subsystem_list with name */
367 list_for_each_entry(info, &qcom_ssr_subsystem_list, list)
368 if (!strcmp(info->name, name))
369 goto out;
370
371 info = kzalloc(sizeof(*info), GFP_KERNEL);
372 if (!info) {
373 info = ERR_PTR(-ENOMEM);
374 goto out;
375 }
376 info->name = kstrdup_const(name, GFP_KERNEL);
377 srcu_init_notifier_head(&info->notifier_list);
378
379 /* Add to global notification list */
380 list_add_tail(&info->list, &qcom_ssr_subsystem_list);
381
382out:
383 mutex_unlock(&qcom_ssr_subsys_lock);
384 return info;
385}
386
387/**
388 * qcom_register_ssr_notifier() - register SSR notification handler
389 * @name: Subsystem's SSR name
390 * @nb: notifier_block to be invoked upon subsystem's state change
391 *
392 * This registers the @nb notifier block as part the notifier chain for a
393 * remoteproc associated with @name. The notifier block's callback
394 * will be invoked when the remote processor's SSR events occur
395 * (pre/post startup and pre/post shutdown).
396 *
397 * Return: a subsystem cookie on success, ERR_PTR on failure.
398 */
399void *qcom_register_ssr_notifier(const char *name, struct notifier_block *nb)
400{
401 struct qcom_ssr_subsystem *info;
402
403 info = qcom_ssr_get_subsys(name);
404 if (IS_ERR(info))
405 return info;
406
407 srcu_notifier_chain_register(&info->notifier_list, nb);
408
409 return &info->notifier_list;
410}
411EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);
412
413/**
414 * qcom_unregister_ssr_notifier() - unregister SSR notification handler
415 * @notify: subsystem cookie returned from qcom_register_ssr_notifier
416 * @nb: notifier_block to unregister
417 *
418 * This function will unregister the notifier from the particular notifier
419 * chain.
420 *
421 * Return: 0 on success, %ENOENT otherwise.
422 */
423int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb)
424{
425 return srcu_notifier_chain_unregister(notify, nb);
426}
427EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
428
429static int ssr_notify_prepare(struct rproc_subdev *subdev)
430{
431 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
432 struct qcom_ssr_notify_data data = {
433 .name = ssr->info->name,
434 .crashed = false,
435 };
436
437 srcu_notifier_call_chain(&ssr->info->notifier_list,
438 QCOM_SSR_BEFORE_POWERUP, &data);
439 return 0;
440}
441
442static int ssr_notify_start(struct rproc_subdev *subdev)
443{
444 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
445 struct qcom_ssr_notify_data data = {
446 .name = ssr->info->name,
447 .crashed = false,
448 };
449
450 srcu_notifier_call_chain(&ssr->info->notifier_list,
451 QCOM_SSR_AFTER_POWERUP, &data);
452 return 0;
453}
454
455static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
456{
457 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
458 struct qcom_ssr_notify_data data = {
459 .name = ssr->info->name,
460 .crashed = crashed,
461 };
462
463 srcu_notifier_call_chain(&ssr->info->notifier_list,
464 QCOM_SSR_BEFORE_SHUTDOWN, &data);
465}
466
467static void ssr_notify_unprepare(struct rproc_subdev *subdev)
468{
469 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
470 struct qcom_ssr_notify_data data = {
471 .name = ssr->info->name,
472 .crashed = false,
473 };
474
475 srcu_notifier_call_chain(&ssr->info->notifier_list,
476 QCOM_SSR_AFTER_SHUTDOWN, &data);
477}
478
479/**
480 * qcom_add_ssr_subdev() - register subdevice as restart notification source
481 * @rproc: rproc handle
482 * @ssr: SSR subdevice handle
483 * @ssr_name: identifier to use for notifications originating from @rproc
484 *
485 * As the @ssr is registered with the @rproc SSR events will be sent to all
486 * registered listeners for the remoteproc when it's SSR events occur
487 * (pre/post startup and pre/post shutdown).
488 */
489void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
490 const char *ssr_name)
491{
492 struct qcom_ssr_subsystem *info;
493
494 info = qcom_ssr_get_subsys(ssr_name);
495 if (IS_ERR(info)) {
496 dev_err(&rproc->dev, "Failed to add ssr subdevice\n");
497 return;
498 }
499
500 ssr->info = info;
501 ssr->subdev.prepare = ssr_notify_prepare;
502 ssr->subdev.start = ssr_notify_start;
503 ssr->subdev.stop = ssr_notify_stop;
504 ssr->subdev.unprepare = ssr_notify_unprepare;
505
506 rproc_add_subdev(rproc, &ssr->subdev);
507}
508EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);
509
510/**
511 * qcom_remove_ssr_subdev() - remove subdevice as restart notification source
512 * @rproc: rproc handle
513 * @ssr: SSR subdevice handle
514 */
515void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
516{
517 rproc_remove_subdev(rproc, &ssr->subdev);
518 ssr->info = NULL;
519}
520EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
521
522MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
523MODULE_LICENSE("GPL v2");
1/*
2 * Qualcomm Peripheral Image Loader helpers
3 *
4 * Copyright (C) 2016 Linaro Ltd
5 * Copyright (C) 2015 Sony Mobile Communications Inc
6 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/firmware.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/notifier.h>
22#include <linux/remoteproc.h>
23#include <linux/rpmsg/qcom_glink.h>
24#include <linux/rpmsg/qcom_smd.h>
25#include <linux/soc/qcom/mdt_loader.h>
26
27#include "remoteproc_internal.h"
28#include "qcom_common.h"
29
30#define to_glink_subdev(d) container_of(d, struct qcom_rproc_glink, subdev)
31#define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
32#define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)
33
34static BLOCKING_NOTIFIER_HEAD(ssr_notifiers);
35
36static int glink_subdev_probe(struct rproc_subdev *subdev)
37{
38 struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
39
40 glink->edge = qcom_glink_smem_register(glink->dev, glink->node);
41
42 return PTR_ERR_OR_ZERO(glink->edge);
43}
44
45static void glink_subdev_remove(struct rproc_subdev *subdev, bool crashed)
46{
47 struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
48
49 qcom_glink_smem_unregister(glink->edge);
50 glink->edge = NULL;
51}
52
53/**
54 * qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc
55 * @rproc: rproc handle to parent the subdevice
56 * @glink: reference to a GLINK subdev context
57 */
58void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
59{
60 struct device *dev = &rproc->dev;
61
62 glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge");
63 if (!glink->node)
64 return;
65
66 glink->dev = dev;
67 rproc_add_subdev(rproc, &glink->subdev, glink_subdev_probe, glink_subdev_remove);
68}
69EXPORT_SYMBOL_GPL(qcom_add_glink_subdev);
70
71/**
72 * qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc
73 * @rproc: rproc handle
74 * @glink: reference to a GLINK subdev context
75 */
76void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
77{
78 if (!glink->node)
79 return;
80
81 rproc_remove_subdev(rproc, &glink->subdev);
82 of_node_put(glink->node);
83}
84EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);
85
86/**
87 * qcom_register_dump_segments() - register segments for coredump
88 * @rproc: remoteproc handle
89 * @fw: firmware header
90 *
91 * Register all segments of the ELF in the remoteproc coredump segment list
92 *
93 * Return: 0 on success, negative errno on failure.
94 */
95int qcom_register_dump_segments(struct rproc *rproc,
96 const struct firmware *fw)
97{
98 const struct elf32_phdr *phdrs;
99 const struct elf32_phdr *phdr;
100 const struct elf32_hdr *ehdr;
101 int ret;
102 int i;
103
104 ehdr = (struct elf32_hdr *)fw->data;
105 phdrs = (struct elf32_phdr *)(ehdr + 1);
106
107 for (i = 0; i < ehdr->e_phnum; i++) {
108 phdr = &phdrs[i];
109
110 if (phdr->p_type != PT_LOAD)
111 continue;
112
113 if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
114 continue;
115
116 if (!phdr->p_memsz)
117 continue;
118
119 ret = rproc_coredump_add_segment(rproc, phdr->p_paddr,
120 phdr->p_memsz);
121 if (ret)
122 return ret;
123 }
124
125 return 0;
126}
127EXPORT_SYMBOL_GPL(qcom_register_dump_segments);
128
129static int smd_subdev_probe(struct rproc_subdev *subdev)
130{
131 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
132
133 smd->edge = qcom_smd_register_edge(smd->dev, smd->node);
134
135 return PTR_ERR_OR_ZERO(smd->edge);
136}
137
138static void smd_subdev_remove(struct rproc_subdev *subdev, bool crashed)
139{
140 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
141
142 qcom_smd_unregister_edge(smd->edge);
143 smd->edge = NULL;
144}
145
146/**
147 * qcom_add_smd_subdev() - try to add a SMD subdevice to rproc
148 * @rproc: rproc handle to parent the subdevice
149 * @smd: reference to a Qualcomm subdev context
150 */
151void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
152{
153 struct device *dev = &rproc->dev;
154
155 smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge");
156 if (!smd->node)
157 return;
158
159 smd->dev = dev;
160 rproc_add_subdev(rproc, &smd->subdev, smd_subdev_probe, smd_subdev_remove);
161}
162EXPORT_SYMBOL_GPL(qcom_add_smd_subdev);
163
164/**
165 * qcom_remove_smd_subdev() - remove the smd subdevice from rproc
166 * @rproc: rproc handle
167 * @smd: the SMD subdevice to remove
168 */
169void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
170{
171 if (!smd->node)
172 return;
173
174 rproc_remove_subdev(rproc, &smd->subdev);
175 of_node_put(smd->node);
176}
177EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
178
179/**
180 * qcom_register_ssr_notifier() - register SSR notification handler
181 * @nb: notifier_block to notify for restart notifications
182 *
183 * Returns 0 on success, negative errno on failure.
184 *
185 * This register the @notify function as handler for restart notifications. As
186 * remote processors are stopped this function will be called, with the SSR
187 * name passed as a parameter.
188 */
189int qcom_register_ssr_notifier(struct notifier_block *nb)
190{
191 return blocking_notifier_chain_register(&ssr_notifiers, nb);
192}
193EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);
194
195/**
196 * qcom_unregister_ssr_notifier() - unregister SSR notification handler
197 * @nb: notifier_block to unregister
198 */
199void qcom_unregister_ssr_notifier(struct notifier_block *nb)
200{
201 blocking_notifier_chain_unregister(&ssr_notifiers, nb);
202}
203EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
204
205static int ssr_notify_start(struct rproc_subdev *subdev)
206{
207 return 0;
208}
209
210static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
211{
212 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
213
214 blocking_notifier_call_chain(&ssr_notifiers, 0, (void *)ssr->name);
215}
216
217/**
218 * qcom_add_ssr_subdev() - register subdevice as restart notification source
219 * @rproc: rproc handle
220 * @ssr: SSR subdevice handle
221 * @ssr_name: identifier to use for notifications originating from @rproc
222 *
223 * As the @ssr is registered with the @rproc SSR events will be sent to all
224 * registered listeners in the system as the remoteproc is shut down.
225 */
226void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
227 const char *ssr_name)
228{
229 ssr->name = ssr_name;
230
231 rproc_add_subdev(rproc, &ssr->subdev, ssr_notify_start, ssr_notify_stop);
232}
233EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);
234
235/**
236 * qcom_remove_ssr_subdev() - remove subdevice as restart notification source
237 * @rproc: rproc handle
238 * @ssr: SSR subdevice handle
239 */
240void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
241{
242 rproc_remove_subdev(rproc, &ssr->subdev);
243}
244EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
245
246MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
247MODULE_LICENSE("GPL v2");