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"); 250