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