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linux
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
26#include "remoteproc_internal.h"
27#include "qcom_common.h"
28
29#define to_glink_subdev(d) container_of(d, struct qcom_rproc_glink, subdev)
30#define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
31#define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)
32
33static BLOCKING_NOTIFIER_HEAD(ssr_notifiers);
34
35/**
36 * qcom_mdt_find_rsc_table() - provide dummy resource table for remoteproc
37 * @rproc: remoteproc handle
38 * @fw: firmware header
39 * @tablesz: outgoing size of the table
40 *
41 * Returns a dummy table.
42 */
43struct resource_table *qcom_mdt_find_rsc_table(struct rproc *rproc,
44 const struct firmware *fw,
45 int *tablesz)
46{
47 static struct resource_table table = { .ver = 1, };
48
49 *tablesz = sizeof(table);
50 return &table;
51}
52EXPORT_SYMBOL_GPL(qcom_mdt_find_rsc_table);
53
54static int glink_subdev_probe(struct rproc_subdev *subdev)
55{
56 struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
57
58 glink->edge = qcom_glink_smem_register(glink->dev, glink->node);
59
60 return IS_ERR(glink->edge) ? PTR_ERR(glink->edge) : 0;
61}
62
63static void glink_subdev_remove(struct rproc_subdev *subdev)
64{
65 struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
66
67 qcom_glink_smem_unregister(glink->edge);
68 glink->edge = NULL;
69}
70
71/**
72 * qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc
73 * @rproc: rproc handle to parent the subdevice
74 * @glink: reference to a GLINK subdev context
75 */
76void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
77{
78 struct device *dev = &rproc->dev;
79
80 glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge");
81 if (!glink->node)
82 return;
83
84 glink->dev = dev;
85 rproc_add_subdev(rproc, &glink->subdev, glink_subdev_probe, glink_subdev_remove);
86}
87EXPORT_SYMBOL_GPL(qcom_add_glink_subdev);
88
89/**
90 * qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc
91 * @rproc: rproc handle
92 * @glink: reference to a GLINK subdev context
93 */
94void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
95{
96 rproc_remove_subdev(rproc, &glink->subdev);
97 of_node_put(glink->node);
98}
99EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);
100
101static int smd_subdev_probe(struct rproc_subdev *subdev)
102{
103 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
104
105 smd->edge = qcom_smd_register_edge(smd->dev, smd->node);
106
107 return PTR_ERR_OR_ZERO(smd->edge);
108}
109
110static void smd_subdev_remove(struct rproc_subdev *subdev)
111{
112 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
113
114 qcom_smd_unregister_edge(smd->edge);
115 smd->edge = NULL;
116}
117
118/**
119 * qcom_add_smd_subdev() - try to add a SMD subdevice to rproc
120 * @rproc: rproc handle to parent the subdevice
121 * @smd: reference to a Qualcomm subdev context
122 */
123void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
124{
125 struct device *dev = &rproc->dev;
126
127 smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge");
128 if (!smd->node)
129 return;
130
131 smd->dev = dev;
132 rproc_add_subdev(rproc, &smd->subdev, smd_subdev_probe, smd_subdev_remove);
133}
134EXPORT_SYMBOL_GPL(qcom_add_smd_subdev);
135
136/**
137 * qcom_remove_smd_subdev() - remove the smd subdevice from rproc
138 * @rproc: rproc handle
139 * @smd: the SMD subdevice to remove
140 */
141void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
142{
143 rproc_remove_subdev(rproc, &smd->subdev);
144 of_node_put(smd->node);
145}
146EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
147
148/**
149 * qcom_register_ssr_notifier() - register SSR notification handler
150 * @nb: notifier_block to notify for restart notifications
151 *
152 * Returns 0 on success, negative errno on failure.
153 *
154 * This register the @notify function as handler for restart notifications. As
155 * remote processors are stopped this function will be called, with the SSR
156 * name passed as a parameter.
157 */
158int qcom_register_ssr_notifier(struct notifier_block *nb)
159{
160 return blocking_notifier_chain_register(&ssr_notifiers, nb);
161}
162EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);
163
164/**
165 * qcom_unregister_ssr_notifier() - unregister SSR notification handler
166 * @nb: notifier_block to unregister
167 */
168void qcom_unregister_ssr_notifier(struct notifier_block *nb)
169{
170 blocking_notifier_chain_unregister(&ssr_notifiers, nb);
171}
172EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
173
174static int ssr_notify_start(struct rproc_subdev *subdev)
175{
176 return 0;
177}
178
179static void ssr_notify_stop(struct rproc_subdev *subdev)
180{
181 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
182
183 blocking_notifier_call_chain(&ssr_notifiers, 0, (void *)ssr->name);
184}
185
186/**
187 * qcom_add_ssr_subdev() - register subdevice as restart notification source
188 * @rproc: rproc handle
189 * @ssr: SSR subdevice handle
190 * @ssr_name: identifier to use for notifications originating from @rproc
191 *
192 * As the @ssr is registered with the @rproc SSR events will be sent to all
193 * registered listeners in the system as the remoteproc is shut down.
194 */
195void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
196 const char *ssr_name)
197{
198 ssr->name = ssr_name;
199
200 rproc_add_subdev(rproc, &ssr->subdev, ssr_notify_start, ssr_notify_stop);
201}
202EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);
203
204/**
205 * qcom_remove_ssr_subdev() - remove subdevice as restart notification source
206 * @rproc: rproc handle
207 * @ssr: SSR subdevice handle
208 */
209void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
210{
211 rproc_remove_subdev(rproc, &ssr->subdev);
212}
213EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
214
215MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
216MODULE_LICENSE("GPL v2");