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 /**
  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  */
  43 struct 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 }
  52 EXPORT_SYMBOL_GPL(qcom_mdt_find_rsc_table);
  53
  54 static 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
  63 static 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  */
  76 void 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 }
  87 EXPORT_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  */
  94 void 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 }
  99 EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);
 100
 101 static 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
 110 static 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  */
 123 void 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 }
 134 EXPORT_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  */
 141 void 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 }
 146 EXPORT_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  */
 158 int qcom_register_ssr_notifier(struct notifier_block *nb)
 159 {
 160         return blocking_notifier_chain_register(&ssr_notifiers, nb);
 161 }
 162 EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);
 163
 164 /**
 165  * qcom_unregister_ssr_notifier() - unregister SSR notification handler
 166  * @nb:         notifier_block to unregister
 167  */
 168 void qcom_unregister_ssr_notifier(struct notifier_block *nb)
 169 {
 170         blocking_notifier_chain_unregister(&ssr_notifiers, nb);
 171 }
 172 EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
 173
 174 static int ssr_notify_start(struct rproc_subdev *subdev)
 175 {
 176         return  0;
 177 }
 178
 179 static 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  */
 195 void 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 }
 202 EXPORT_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  */
 209 void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
 210 {
 211         rproc_remove_subdev(rproc, &ssr->subdev);
 212 }
 213 EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
 214
 215 MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
 216 MODULE_LICENSE("GPL v2");