1 // SPDX-License-Identifier: GPL-2.0-only
3 * Qualcomm Peripheral Image Loader helpers
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.
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>
21 #include "remoteproc_internal.h"
22 #include "qcom_common.h"
24 #define to_glink_subdev(d) container_of(d, struct qcom_rproc_glink, subdev)
25 #define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
26 #define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)
28 struct qcom_ssr_subsystem {
30 struct srcu_notifier_head notifier_list;
31 struct list_head list;
34 static LIST_HEAD(qcom_ssr_subsystem_list);
35 static DEFINE_MUTEX(qcom_ssr_subsys_lock);
37 static int glink_subdev_start(struct rproc_subdev *subdev)
39 struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
41 glink->edge = qcom_glink_smem_register(glink->dev, glink->node);
43 return PTR_ERR_OR_ZERO(glink->edge);
46 static void glink_subdev_stop(struct rproc_subdev *subdev, bool crashed)
48 struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
50 qcom_glink_smem_unregister(glink->edge);
54 static void glink_subdev_unprepare(struct rproc_subdev *subdev)
56 struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
58 qcom_glink_ssr_notify(glink->ssr_name);
62 * qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc
63 * @rproc: rproc handle to parent the subdevice
64 * @glink: reference to a GLINK subdev context
65 * @ssr_name: identifier of the associated remoteproc for ssr notifications
67 void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink,
70 struct device *dev = &rproc->dev;
72 glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge");
76 glink->ssr_name = kstrdup_const(ssr_name, GFP_KERNEL);
81 glink->subdev.start = glink_subdev_start;
82 glink->subdev.stop = glink_subdev_stop;
83 glink->subdev.unprepare = glink_subdev_unprepare;
85 rproc_add_subdev(rproc, &glink->subdev);
87 EXPORT_SYMBOL_GPL(qcom_add_glink_subdev);
90 * qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc
91 * @rproc: rproc handle
92 * @glink: reference to a GLINK subdev context
94 void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
99 rproc_remove_subdev(rproc, &glink->subdev);
100 kfree_const(glink->ssr_name);
101 of_node_put(glink->node);
103 EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);
106 * qcom_register_dump_segments() - register segments for coredump
107 * @rproc: remoteproc handle
108 * @fw: firmware header
110 * Register all segments of the ELF in the remoteproc coredump segment list
112 * Return: 0 on success, negative errno on failure.
114 int qcom_register_dump_segments(struct rproc *rproc,
115 const struct firmware *fw)
117 const struct elf32_phdr *phdrs;
118 const struct elf32_phdr *phdr;
119 const struct elf32_hdr *ehdr;
123 ehdr = (struct elf32_hdr *)fw->data;
124 phdrs = (struct elf32_phdr *)(ehdr + 1);
126 for (i = 0; i < ehdr->e_phnum; i++) {
129 if (phdr->p_type != PT_LOAD)
132 if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
138 ret = rproc_coredump_add_segment(rproc, phdr->p_paddr,
146 EXPORT_SYMBOL_GPL(qcom_register_dump_segments);
148 static int smd_subdev_start(struct rproc_subdev *subdev)
150 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
152 smd->edge = qcom_smd_register_edge(smd->dev, smd->node);
154 return PTR_ERR_OR_ZERO(smd->edge);
157 static void smd_subdev_stop(struct rproc_subdev *subdev, bool crashed)
159 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
161 qcom_smd_unregister_edge(smd->edge);
166 * qcom_add_smd_subdev() - try to add a SMD subdevice to rproc
167 * @rproc: rproc handle to parent the subdevice
168 * @smd: reference to a Qualcomm subdev context
170 void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
172 struct device *dev = &rproc->dev;
174 smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge");
179 smd->subdev.start = smd_subdev_start;
180 smd->subdev.stop = smd_subdev_stop;
182 rproc_add_subdev(rproc, &smd->subdev);
184 EXPORT_SYMBOL_GPL(qcom_add_smd_subdev);
187 * qcom_remove_smd_subdev() - remove the smd subdevice from rproc
188 * @rproc: rproc handle
189 * @smd: the SMD subdevice to remove
191 void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
196 rproc_remove_subdev(rproc, &smd->subdev);
197 of_node_put(smd->node);
199 EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
201 static struct qcom_ssr_subsystem *qcom_ssr_get_subsys(const char *name)
203 struct qcom_ssr_subsystem *info;
205 mutex_lock(&qcom_ssr_subsys_lock);
206 /* Match in the global qcom_ssr_subsystem_list with name */
207 list_for_each_entry(info, &qcom_ssr_subsystem_list, list)
208 if (!strcmp(info->name, name))
211 info = kzalloc(sizeof(*info), GFP_KERNEL);
213 info = ERR_PTR(-ENOMEM);
216 info->name = kstrdup_const(name, GFP_KERNEL);
217 srcu_init_notifier_head(&info->notifier_list);
219 /* Add to global notification list */
220 list_add_tail(&info->list, &qcom_ssr_subsystem_list);
223 mutex_unlock(&qcom_ssr_subsys_lock);
228 * qcom_register_ssr_notifier() - register SSR notification handler
229 * @name: Subsystem's SSR name
230 * @nb: notifier_block to be invoked upon subsystem's state change
232 * This registers the @nb notifier block as part the notifier chain for a
233 * remoteproc associated with @name. The notifier block's callback
234 * will be invoked when the remote processor's SSR events occur
235 * (pre/post startup and pre/post shutdown).
237 * Return: a subsystem cookie on success, ERR_PTR on failure.
239 void *qcom_register_ssr_notifier(const char *name, struct notifier_block *nb)
241 struct qcom_ssr_subsystem *info;
243 info = qcom_ssr_get_subsys(name);
247 srcu_notifier_chain_register(&info->notifier_list, nb);
249 return &info->notifier_list;
251 EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);
254 * qcom_unregister_ssr_notifier() - unregister SSR notification handler
255 * @notify: subsystem cookie returned from qcom_register_ssr_notifier
256 * @nb: notifier_block to unregister
258 * This function will unregister the notifier from the particular notifier
261 * Return: 0 on success, %ENOENT otherwise.
263 int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb)
265 return srcu_notifier_chain_unregister(notify, nb);
267 EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
269 static int ssr_notify_prepare(struct rproc_subdev *subdev)
271 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
272 struct qcom_ssr_notify_data data = {
273 .name = ssr->info->name,
277 srcu_notifier_call_chain(&ssr->info->notifier_list,
278 QCOM_SSR_BEFORE_POWERUP, &data);
282 static int ssr_notify_start(struct rproc_subdev *subdev)
284 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
285 struct qcom_ssr_notify_data data = {
286 .name = ssr->info->name,
290 srcu_notifier_call_chain(&ssr->info->notifier_list,
291 QCOM_SSR_AFTER_POWERUP, &data);
295 static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
297 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
298 struct qcom_ssr_notify_data data = {
299 .name = ssr->info->name,
303 srcu_notifier_call_chain(&ssr->info->notifier_list,
304 QCOM_SSR_BEFORE_SHUTDOWN, &data);
307 static void ssr_notify_unprepare(struct rproc_subdev *subdev)
309 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
310 struct qcom_ssr_notify_data data = {
311 .name = ssr->info->name,
315 srcu_notifier_call_chain(&ssr->info->notifier_list,
316 QCOM_SSR_AFTER_SHUTDOWN, &data);
320 * qcom_add_ssr_subdev() - register subdevice as restart notification source
321 * @rproc: rproc handle
322 * @ssr: SSR subdevice handle
323 * @ssr_name: identifier to use for notifications originating from @rproc
325 * As the @ssr is registered with the @rproc SSR events will be sent to all
326 * registered listeners for the remoteproc when it's SSR events occur
327 * (pre/post startup and pre/post shutdown).
329 void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
330 const char *ssr_name)
332 struct qcom_ssr_subsystem *info;
334 info = qcom_ssr_get_subsys(ssr_name);
336 dev_err(&rproc->dev, "Failed to add ssr subdevice\n");
341 ssr->subdev.prepare = ssr_notify_prepare;
342 ssr->subdev.start = ssr_notify_start;
343 ssr->subdev.stop = ssr_notify_stop;
344 ssr->subdev.unprepare = ssr_notify_unprepare;
346 rproc_add_subdev(rproc, &ssr->subdev);
348 EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);
351 * qcom_remove_ssr_subdev() - remove subdevice as restart notification source
352 * @rproc: rproc handle
353 * @ssr: SSR subdevice handle
355 void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
357 rproc_remove_subdev(rproc, &ssr->subdev);
360 EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
362 MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
363 MODULE_LICENSE("GPL v2");