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 /** 46 * qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc 47 * @rproc: rproc handle to parent the subdevice 48 * @glink: reference to a GLINK subdev context 49 */ 50 void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink) 51 { 52 struct device *dev = &rproc->dev; 53 54 glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge"); 55 if (!glink->node) 56 return; 57 58 glink->dev = dev; 59 glink->subdev.start = glink_subdev_start; 60 glink->subdev.stop = glink_subdev_stop; 61 62 rproc_add_subdev(rproc, &glink->subdev); 63 } 64 EXPORT_SYMBOL_GPL(qcom_add_glink_subdev); 65 66 /** 67 * qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc 68 * @rproc: rproc handle 69 * @glink: reference to a GLINK subdev context 70 */ 71 void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink) 72 { 73 if (!glink->node) 74 return; 75 76 rproc_remove_subdev(rproc, &glink->subdev); 77 of_node_put(glink->node); 78 } 79 EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev); 80 81 /** 82 * qcom_register_dump_segments() - register segments for coredump 83 * @rproc: remoteproc handle 84 * @fw: firmware header 85 * 86 * Register all segments of the ELF in the remoteproc coredump segment list 87 * 88 * Return: 0 on success, negative errno on failure. 89 */ 90 int qcom_register_dump_segments(struct rproc *rproc, 91 const struct firmware *fw) 92 { 93 const struct elf32_phdr *phdrs; 94 const struct elf32_phdr *phdr; 95 const struct elf32_hdr *ehdr; 96 int ret; 97 int i; 98 99 ehdr = (struct elf32_hdr *)fw->data; 100 phdrs = (struct elf32_phdr *)(ehdr + 1); 101 102 for (i = 0; i < ehdr->e_phnum; i++) { 103 phdr = &phdrs[i]; 104 105 if (phdr->p_type != PT_LOAD) 106 continue; 107 108 if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH) 109 continue; 110 111 if (!phdr->p_memsz) 112 continue; 113 114 ret = rproc_coredump_add_segment(rproc, phdr->p_paddr, 115 phdr->p_memsz); 116 if (ret) 117 return ret; 118 } 119 120 return 0; 121 } 122 EXPORT_SYMBOL_GPL(qcom_register_dump_segments); 123 124 static int smd_subdev_start(struct rproc_subdev *subdev) 125 { 126 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev); 127 128 smd->edge = qcom_smd_register_edge(smd->dev, smd->node); 129 130 return PTR_ERR_OR_ZERO(smd->edge); 131 } 132 133 static void smd_subdev_stop(struct rproc_subdev *subdev, bool crashed) 134 { 135 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev); 136 137 qcom_smd_unregister_edge(smd->edge); 138 smd->edge = NULL; 139 } 140 141 /** 142 * qcom_add_smd_subdev() - try to add a SMD subdevice to rproc 143 * @rproc: rproc handle to parent the subdevice 144 * @smd: reference to a Qualcomm subdev context 145 */ 146 void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd) 147 { 148 struct device *dev = &rproc->dev; 149 150 smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge"); 151 if (!smd->node) 152 return; 153 154 smd->dev = dev; 155 smd->subdev.start = smd_subdev_start; 156 smd->subdev.stop = smd_subdev_stop; 157 158 rproc_add_subdev(rproc, &smd->subdev); 159 } 160 EXPORT_SYMBOL_GPL(qcom_add_smd_subdev); 161 162 /** 163 * qcom_remove_smd_subdev() - remove the smd subdevice from rproc 164 * @rproc: rproc handle 165 * @smd: the SMD subdevice to remove 166 */ 167 void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd) 168 { 169 if (!smd->node) 170 return; 171 172 rproc_remove_subdev(rproc, &smd->subdev); 173 of_node_put(smd->node); 174 } 175 EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev); 176 177 /** 178 * qcom_register_ssr_notifier() - register SSR notification handler 179 * @nb: notifier_block to notify for restart notifications 180 * 181 * Returns 0 on success, negative errno on failure. 182 * 183 * This register the @notify function as handler for restart notifications. As 184 * remote processors are stopped this function will be called, with the SSR 185 * name passed as a parameter. 186 */ 187 int qcom_register_ssr_notifier(struct notifier_block *nb) 188 { 189 return blocking_notifier_chain_register(&ssr_notifiers, nb); 190 } 191 EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier); 192 193 /** 194 * qcom_unregister_ssr_notifier() - unregister SSR notification handler 195 * @nb: notifier_block to unregister 196 */ 197 void qcom_unregister_ssr_notifier(struct notifier_block *nb) 198 { 199 blocking_notifier_chain_unregister(&ssr_notifiers, nb); 200 } 201 EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier); 202 203 static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed) 204 { 205 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); 206 207 blocking_notifier_call_chain(&ssr_notifiers, 0, (void *)ssr->name); 208 } 209 210 /** 211 * qcom_add_ssr_subdev() - register subdevice as restart notification source 212 * @rproc: rproc handle 213 * @ssr: SSR subdevice handle 214 * @ssr_name: identifier to use for notifications originating from @rproc 215 * 216 * As the @ssr is registered with the @rproc SSR events will be sent to all 217 * registered listeners in the system as the remoteproc is shut down. 218 */ 219 void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr, 220 const char *ssr_name) 221 { 222 ssr->name = ssr_name; 223 ssr->subdev.stop = ssr_notify_stop; 224 225 rproc_add_subdev(rproc, &ssr->subdev); 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