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 #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
  34 static BLOCKING_NOTIFIER_HEAD(ssr_notifiers);
  35
  36 static int glink_subdev_start(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
  45 static void glink_subdev_stop(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  */
  58 void 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         glink->subdev.start = glink_subdev_start;
  68         glink->subdev.stop = glink_subdev_stop;
  69
  70         rproc_add_subdev(rproc, &glink->subdev);
  71 }
  72 EXPORT_SYMBOL_GPL(qcom_add_glink_subdev);
  73
  74 /**
  75  * qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc
  76  * @rproc:      rproc handle
  77  * @glink:      reference to a GLINK subdev context
  78  */
  79 void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
  80 {
  81         if (!glink->node)
  82                 return;
  83
  84         rproc_remove_subdev(rproc, &glink->subdev);
  85         of_node_put(glink->node);
  86 }
  87 EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);
  88
  89 /**
  90  * qcom_register_dump_segments() - register segments for coredump
  91  * @rproc:      remoteproc handle
  92  * @fw:         firmware header
  93  *
  94  * Register all segments of the ELF in the remoteproc coredump segment list
  95  *
  96  * Return: 0 on success, negative errno on failure.
  97  */
  98 int qcom_register_dump_segments(struct rproc *rproc,
  99                                 const struct firmware *fw)
 100 {
 101         const struct elf32_phdr *phdrs;
 102         const struct elf32_phdr *phdr;
 103         const struct elf32_hdr *ehdr;
 104         int ret;
 105         int i;
 106
 107         ehdr = (struct elf32_hdr *)fw->data;
 108         phdrs = (struct elf32_phdr *)(ehdr + 1);
 109
 110         for (i = 0; i < ehdr->e_phnum; i++) {
 111                 phdr = &phdrs[i];
 112
 113                 if (phdr->p_type != PT_LOAD)
 114                         continue;
 115
 116                 if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
 117                         continue;
 118
 119                 if (!phdr->p_memsz)
 120                         continue;
 121
 122                 ret = rproc_coredump_add_segment(rproc, phdr->p_paddr,
 123                                                  phdr->p_memsz);
 124                 if (ret)
 125                         return ret;
 126         }
 127
 128         return 0;
 129 }
 130 EXPORT_SYMBOL_GPL(qcom_register_dump_segments);
 131
 132 static int smd_subdev_start(struct rproc_subdev *subdev)
 133 {
 134         struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
 135
 136         smd->edge = qcom_smd_register_edge(smd->dev, smd->node);
 137
 138         return PTR_ERR_OR_ZERO(smd->edge);
 139 }
 140
 141 static void smd_subdev_stop(struct rproc_subdev *subdev, bool crashed)
 142 {
 143         struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
 144
 145         qcom_smd_unregister_edge(smd->edge);
 146         smd->edge = NULL;
 147 }
 148
 149 /**
 150  * qcom_add_smd_subdev() - try to add a SMD subdevice to rproc
 151  * @rproc:      rproc handle to parent the subdevice
 152  * @smd:        reference to a Qualcomm subdev context
 153  */
 154 void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
 155 {
 156         struct device *dev = &rproc->dev;
 157
 158         smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge");
 159         if (!smd->node)
 160                 return;
 161
 162         smd->dev = dev;
 163         smd->subdev.start = smd_subdev_start;
 164         smd->subdev.stop = smd_subdev_stop;
 165
 166         rproc_add_subdev(rproc, &smd->subdev);
 167 }
 168 EXPORT_SYMBOL_GPL(qcom_add_smd_subdev);
 169
 170 /**
 171  * qcom_remove_smd_subdev() - remove the smd subdevice from rproc
 172  * @rproc:      rproc handle
 173  * @smd:        the SMD subdevice to remove
 174  */
 175 void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
 176 {
 177         if (!smd->node)
 178                 return;
 179
 180         rproc_remove_subdev(rproc, &smd->subdev);
 181         of_node_put(smd->node);
 182 }
 183 EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
 184
 185 /**
 186  * qcom_register_ssr_notifier() - register SSR notification handler
 187  * @nb:         notifier_block to notify for restart notifications
 188  *
 189  * Returns 0 on success, negative errno on failure.
 190  *
 191  * This register the @notify function as handler for restart notifications. As
 192  * remote processors are stopped this function will be called, with the SSR
 193  * name passed as a parameter.
 194  */
 195 int qcom_register_ssr_notifier(struct notifier_block *nb)
 196 {
 197         return blocking_notifier_chain_register(&ssr_notifiers, nb);
 198 }
 199 EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);
 200
 201 /**
 202  * qcom_unregister_ssr_notifier() - unregister SSR notification handler
 203  * @nb:         notifier_block to unregister
 204  */
 205 void qcom_unregister_ssr_notifier(struct notifier_block *nb)
 206 {
 207         blocking_notifier_chain_unregister(&ssr_notifiers, nb);
 208 }
 209 EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
 210
 211 static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
 212 {
 213         struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
 214
 215         blocking_notifier_call_chain(&ssr_notifiers, 0, (void *)ssr->name);
 216 }
 217
 218 /**
 219  * qcom_add_ssr_subdev() - register subdevice as restart notification source
 220  * @rproc:      rproc handle
 221  * @ssr:        SSR subdevice handle
 222  * @ssr_name:   identifier to use for notifications originating from @rproc
 223  *
 224  * As the @ssr is registered with the @rproc SSR events will be sent to all
 225  * registered listeners in the system as the remoteproc is shut down.
 226  */
 227 void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
 228                          const char *ssr_name)
 229 {
 230         ssr->name = ssr_name;
 231         ssr->subdev.stop = ssr_notify_stop;
 232
 233         rproc_add_subdev(rproc, &ssr->subdev);
 234 }
 235 EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);
 236
 237 /**
 238  * qcom_remove_ssr_subdev() - remove subdevice as restart notification source
 239  * @rproc:      rproc handle
 240  * @ssr:        SSR subdevice handle
 241  */
 242 void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
 243 {
 244         rproc_remove_subdev(rproc, &ssr->subdev);
 245 }
 246 EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
 247
 248 MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
 249 MODULE_LICENSE("GPL v2");