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