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"); 257