drivers/remoteproc/qcom_common.c

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