drivers/remoteproc/qcom_common.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Qualcomm Peripheral Image Loader helpers
   4  *
   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.
   8  */
   9
  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/rpmsg/qcom_glink.h>
  16 #include <linux/rpmsg/qcom_smd.h>
  17 #include <linux/soc/qcom/mdt_loader.h>
  18
  19 #include "remoteproc_internal.h"
  20 #include "qcom_common.h"
  21
  22 #define to_glink_subdev(d) container_of(d, struct qcom_rproc_glink, subdev)
  23 #define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
  24 #define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)
  25
  26 static BLOCKING_NOTIFIER_HEAD(ssr_notifiers);
  27
  28 static int glink_subdev_start(struct rproc_subdev *subdev)
  29 {
  30         struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
  31
  32         glink->edge = qcom_glink_smem_register(glink->dev, glink->node);
  33
  34         return PTR_ERR_OR_ZERO(glink->edge);
  35 }
  36
  37 static void glink_subdev_stop(struct rproc_subdev *subdev, bool crashed)
  38 {
  39         struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
  40
  41         qcom_glink_smem_unregister(glink->edge);
  42         glink->edge = NULL;
  43 }
  44
  45 static void glink_subdev_unprepare(struct rproc_subdev *subdev)
  46 {
  47         struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
  48
  49         qcom_glink_ssr_notify(glink->ssr_name);
  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  * @ssr_name:   identifier of the associated remoteproc for ssr notifications
  57  */
  58 void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink,
  59                            const char *ssr_name)
  60 {
  61         struct device *dev = &rproc->dev;
  62
  63         glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge");
  64         if (!glink->node)
  65                 return;
  66
  67         glink->ssr_name = kstrdup_const(ssr_name, GFP_KERNEL);
  68         if (!glink->ssr_name)
  69                 return;
  70
  71         glink->dev = dev;
  72         glink->subdev.start = glink_subdev_start;
  73         glink->subdev.stop = glink_subdev_stop;
  74         glink->subdev.unprepare = glink_subdev_unprepare;
  75
  76         rproc_add_subdev(rproc, &glink->subdev);
  77 }
  78 EXPORT_SYMBOL_GPL(qcom_add_glink_subdev);
  79
  80 /**
  81  * qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc
  82  * @rproc:      rproc handle
  83  * @glink:      reference to a GLINK subdev context
  84  */
  85 void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
  86 {
  87         if (!glink->node)
  88                 return;
  89
  90         rproc_remove_subdev(rproc, &glink->subdev);
  91         kfree_const(glink->ssr_name);
  92         of_node_put(glink->node);
  93 }
  94 EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);
  95
  96 /**
  97  * qcom_register_dump_segments() - register segments for coredump
  98  * @rproc:      remoteproc handle
  99  * @fw:         firmware header
 100  *
 101  * Register all segments of the ELF in the remoteproc coredump segment list
 102  *
 103  * Return: 0 on success, negative errno on failure.
 104  */
 105 int qcom_register_dump_segments(struct rproc *rproc,
 106                                 const struct firmware *fw)
 107 {
 108         const struct elf32_phdr *phdrs;
 109         const struct elf32_phdr *phdr;
 110         const struct elf32_hdr *ehdr;
 111         int ret;
 112         int i;
 113
 114         ehdr = (struct elf32_hdr *)fw->data;
 115         phdrs = (struct elf32_phdr *)(ehdr + 1);
 116
 117         for (i = 0; i < ehdr->e_phnum; i++) {
 118                 phdr = &phdrs[i];
 119
 120                 if (phdr->p_type != PT_LOAD)
 121                         continue;
 122
 123                 if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
 124                         continue;
 125
 126                 if (!phdr->p_memsz)
 127                         continue;
 128
 129                 ret = rproc_coredump_add_segment(rproc, phdr->p_paddr,
 130                                                  phdr->p_memsz);
 131                 if (ret)
 132                         return ret;
 133         }
 134
 135         return 0;
 136 }
 137 EXPORT_SYMBOL_GPL(qcom_register_dump_segments);
 138
 139 static int smd_subdev_start(struct rproc_subdev *subdev)
 140 {
 141         struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
 142
 143         smd->edge = qcom_smd_register_edge(smd->dev, smd->node);
 144
 145         return PTR_ERR_OR_ZERO(smd->edge);
 146 }
 147
 148 static void smd_subdev_stop(struct rproc_subdev *subdev, bool crashed)
 149 {
 150         struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
 151
 152         qcom_smd_unregister_edge(smd->edge);
 153         smd->edge = NULL;
 154 }
 155
 156 /**
 157  * qcom_add_smd_subdev() - try to add a SMD subdevice to rproc
 158  * @rproc:      rproc handle to parent the subdevice
 159  * @smd:        reference to a Qualcomm subdev context
 160  */
 161 void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
 162 {
 163         struct device *dev = &rproc->dev;
 164
 165         smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge");
 166         if (!smd->node)
 167                 return;
 168
 169         smd->dev = dev;
 170         smd->subdev.start = smd_subdev_start;
 171         smd->subdev.stop = smd_subdev_stop;
 172
 173         rproc_add_subdev(rproc, &smd->subdev);
 174 }
 175 EXPORT_SYMBOL_GPL(qcom_add_smd_subdev);
 176
 177 /**
 178  * qcom_remove_smd_subdev() - remove the smd subdevice from rproc
 179  * @rproc:      rproc handle
 180  * @smd:        the SMD subdevice to remove
 181  */
 182 void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
 183 {
 184         if (!smd->node)
 185                 return;
 186
 187         rproc_remove_subdev(rproc, &smd->subdev);
 188         of_node_put(smd->node);
 189 }
 190 EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
 191
 192 /**
 193  * qcom_register_ssr_notifier() - register SSR notification handler
 194  * @nb:         notifier_block to notify for restart notifications
 195  *
 196  * Returns 0 on success, negative errno on failure.
 197  *
 198  * This register the @notify function as handler for restart notifications. As
 199  * remote processors are stopped this function will be called, with the SSR
 200  * name passed as a parameter.
 201  */
 202 int qcom_register_ssr_notifier(struct notifier_block *nb)
 203 {
 204         return blocking_notifier_chain_register(&ssr_notifiers, nb);
 205 }
 206 EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);
 207
 208 /**
 209  * qcom_unregister_ssr_notifier() - unregister SSR notification handler
 210  * @nb:         notifier_block to unregister
 211  */
 212 void qcom_unregister_ssr_notifier(struct notifier_block *nb)
 213 {
 214         blocking_notifier_chain_unregister(&ssr_notifiers, nb);
 215 }
 216 EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
 217
 218 static void ssr_notify_unprepare(struct rproc_subdev *subdev)
 219 {
 220         struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
 221
 222         blocking_notifier_call_chain(&ssr_notifiers, 0, (void *)ssr->name);
 223 }
 224
 225 /**
 226  * qcom_add_ssr_subdev() - register subdevice as restart notification source
 227  * @rproc:      rproc handle
 228  * @ssr:        SSR subdevice handle
 229  * @ssr_name:   identifier to use for notifications originating from @rproc
 230  *
 231  * As the @ssr is registered with the @rproc SSR events will be sent to all
 232  * registered listeners in the system as the remoteproc is shut down.
 233  */
 234 void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
 235                          const char *ssr_name)
 236 {
 237         ssr->name = ssr_name;
 238         ssr->subdev.unprepare = ssr_notify_unprepare;
 239
 240         rproc_add_subdev(rproc, &ssr->subdev);
 241 }
 242 EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);
 243
 244 /**
 245  * qcom_remove_ssr_subdev() - remove subdevice as restart notification source
 246  * @rproc:      rproc handle
 247  * @ssr:        SSR subdevice handle
 248  */
 249 void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
 250 {
 251         rproc_remove_subdev(rproc, &ssr->subdev);
 252 }
 253 EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
 254
 255 MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
 256 MODULE_LICENSE("GPL v2");