diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/remoteproc/qcom_common.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c new file mode 100644 index 000000000..085fd73fa --- /dev/null +++ b/drivers/remoteproc/qcom_common.c @@ -0,0 +1,363 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Qualcomm Peripheral Image Loader helpers + * + * Copyright (C) 2016 Linaro Ltd + * Copyright (C) 2015 Sony Mobile Communications Inc + * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved. + */ + +#include <linux/firmware.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/notifier.h> +#include <linux/remoteproc.h> +#include <linux/remoteproc/qcom_rproc.h> +#include <linux/rpmsg/qcom_glink.h> +#include <linux/rpmsg/qcom_smd.h> +#include <linux/slab.h> +#include <linux/soc/qcom/mdt_loader.h> + +#include "remoteproc_internal.h" +#include "qcom_common.h" + +#define to_glink_subdev(d) container_of(d, struct qcom_rproc_glink, subdev) +#define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev) +#define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev) + +struct qcom_ssr_subsystem { + const char *name; + struct srcu_notifier_head notifier_list; + struct list_head list; +}; + +static LIST_HEAD(qcom_ssr_subsystem_list); +static DEFINE_MUTEX(qcom_ssr_subsys_lock); + +static int glink_subdev_start(struct rproc_subdev *subdev) +{ + struct qcom_rproc_glink *glink = to_glink_subdev(subdev); + + glink->edge = qcom_glink_smem_register(glink->dev, glink->node); + + return PTR_ERR_OR_ZERO(glink->edge); +} + +static void glink_subdev_stop(struct rproc_subdev *subdev, bool crashed) +{ + struct qcom_rproc_glink *glink = to_glink_subdev(subdev); + + qcom_glink_smem_unregister(glink->edge); + glink->edge = NULL; +} + +static void glink_subdev_unprepare(struct rproc_subdev *subdev) +{ + struct qcom_rproc_glink *glink = to_glink_subdev(subdev); + + qcom_glink_ssr_notify(glink->ssr_name); +} + +/** + * qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc + * @rproc: rproc handle to parent the subdevice + * @glink: reference to a GLINK subdev context + * @ssr_name: identifier of the associated remoteproc for ssr notifications + */ +void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink, + const char *ssr_name) +{ + struct device *dev = &rproc->dev; + + glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge"); + if (!glink->node) + return; + + glink->ssr_name = kstrdup_const(ssr_name, GFP_KERNEL); + if (!glink->ssr_name) + return; + + glink->dev = dev; + glink->subdev.start = glink_subdev_start; + glink->subdev.stop = glink_subdev_stop; + glink->subdev.unprepare = glink_subdev_unprepare; + + rproc_add_subdev(rproc, &glink->subdev); +} +EXPORT_SYMBOL_GPL(qcom_add_glink_subdev); + +/** + * qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc + * @rproc: rproc handle + * @glink: reference to a GLINK subdev context + */ +void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink) +{ + if (!glink->node) + return; + + rproc_remove_subdev(rproc, &glink->subdev); + kfree_const(glink->ssr_name); + of_node_put(glink->node); +} +EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev); + +/** + * qcom_register_dump_segments() - register segments for coredump + * @rproc: remoteproc handle + * @fw: firmware header + * + * Register all segments of the ELF in the remoteproc coredump segment list + * + * Return: 0 on success, negative errno on failure. + */ +int qcom_register_dump_segments(struct rproc *rproc, + const struct firmware *fw) +{ + const struct elf32_phdr *phdrs; + const struct elf32_phdr *phdr; + const struct elf32_hdr *ehdr; + int ret; + int i; + + ehdr = (struct elf32_hdr *)fw->data; + phdrs = (struct elf32_phdr *)(ehdr + 1); + + for (i = 0; i < ehdr->e_phnum; i++) { + phdr = &phdrs[i]; + + if (phdr->p_type != PT_LOAD) + continue; + + if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH) + continue; + + if (!phdr->p_memsz) + continue; + + ret = rproc_coredump_add_segment(rproc, phdr->p_paddr, + phdr->p_memsz); + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(qcom_register_dump_segments); + +static int smd_subdev_start(struct rproc_subdev *subdev) +{ + struct qcom_rproc_subdev *smd = to_smd_subdev(subdev); + + smd->edge = qcom_smd_register_edge(smd->dev, smd->node); + + return PTR_ERR_OR_ZERO(smd->edge); +} + +static void smd_subdev_stop(struct rproc_subdev *subdev, bool crashed) +{ + struct qcom_rproc_subdev *smd = to_smd_subdev(subdev); + + qcom_smd_unregister_edge(smd->edge); + smd->edge = NULL; +} + +/** + * qcom_add_smd_subdev() - try to add a SMD subdevice to rproc + * @rproc: rproc handle to parent the subdevice + * @smd: reference to a Qualcomm subdev context + */ +void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd) +{ + struct device *dev = &rproc->dev; + + smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge"); + if (!smd->node) + return; + + smd->dev = dev; + smd->subdev.start = smd_subdev_start; + smd->subdev.stop = smd_subdev_stop; + + rproc_add_subdev(rproc, &smd->subdev); +} +EXPORT_SYMBOL_GPL(qcom_add_smd_subdev); + +/** + * qcom_remove_smd_subdev() - remove the smd subdevice from rproc + * @rproc: rproc handle + * @smd: the SMD subdevice to remove + */ +void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd) +{ + if (!smd->node) + return; + + rproc_remove_subdev(rproc, &smd->subdev); + of_node_put(smd->node); +} +EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev); + +static struct qcom_ssr_subsystem *qcom_ssr_get_subsys(const char *name) +{ + struct qcom_ssr_subsystem *info; + + mutex_lock(&qcom_ssr_subsys_lock); + /* Match in the global qcom_ssr_subsystem_list with name */ + list_for_each_entry(info, &qcom_ssr_subsystem_list, list) + if (!strcmp(info->name, name)) + goto out; + + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (!info) { + info = ERR_PTR(-ENOMEM); + goto out; + } + info->name = kstrdup_const(name, GFP_KERNEL); + srcu_init_notifier_head(&info->notifier_list); + + /* Add to global notification list */ + list_add_tail(&info->list, &qcom_ssr_subsystem_list); + +out: + mutex_unlock(&qcom_ssr_subsys_lock); + return info; +} + +/** + * qcom_register_ssr_notifier() - register SSR notification handler + * @name: Subsystem's SSR name + * @nb: notifier_block to be invoked upon subsystem's state change + * + * This registers the @nb notifier block as part the notifier chain for a + * remoteproc associated with @name. The notifier block's callback + * will be invoked when the remote processor's SSR events occur + * (pre/post startup and pre/post shutdown). + * + * Return: a subsystem cookie on success, ERR_PTR on failure. + */ +void *qcom_register_ssr_notifier(const char *name, struct notifier_block *nb) +{ + struct qcom_ssr_subsystem *info; + + info = qcom_ssr_get_subsys(name); + if (IS_ERR(info)) + return info; + + srcu_notifier_chain_register(&info->notifier_list, nb); + + return &info->notifier_list; +} +EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier); + +/** + * qcom_unregister_ssr_notifier() - unregister SSR notification handler + * @notify: subsystem cookie returned from qcom_register_ssr_notifier + * @nb: notifier_block to unregister + * + * This function will unregister the notifier from the particular notifier + * chain. + * + * Return: 0 on success, %ENOENT otherwise. + */ +int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb) +{ + return srcu_notifier_chain_unregister(notify, nb); +} +EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier); + +static int ssr_notify_prepare(struct rproc_subdev *subdev) +{ + struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); + struct qcom_ssr_notify_data data = { + .name = ssr->info->name, + .crashed = false, + }; + + srcu_notifier_call_chain(&ssr->info->notifier_list, + QCOM_SSR_BEFORE_POWERUP, &data); + return 0; +} + +static int ssr_notify_start(struct rproc_subdev *subdev) +{ + struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); + struct qcom_ssr_notify_data data = { + .name = ssr->info->name, + .crashed = false, + }; + + srcu_notifier_call_chain(&ssr->info->notifier_list, + QCOM_SSR_AFTER_POWERUP, &data); + return 0; +} + +static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed) +{ + struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); + struct qcom_ssr_notify_data data = { + .name = ssr->info->name, + .crashed = crashed, + }; + + srcu_notifier_call_chain(&ssr->info->notifier_list, + QCOM_SSR_BEFORE_SHUTDOWN, &data); +} + +static void ssr_notify_unprepare(struct rproc_subdev *subdev) +{ + struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); + struct qcom_ssr_notify_data data = { + .name = ssr->info->name, + .crashed = false, + }; + + srcu_notifier_call_chain(&ssr->info->notifier_list, + QCOM_SSR_AFTER_SHUTDOWN, &data); +} + +/** + * qcom_add_ssr_subdev() - register subdevice as restart notification source + * @rproc: rproc handle + * @ssr: SSR subdevice handle + * @ssr_name: identifier to use for notifications originating from @rproc + * + * As the @ssr is registered with the @rproc SSR events will be sent to all + * registered listeners for the remoteproc when it's SSR events occur + * (pre/post startup and pre/post shutdown). + */ +void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr, + const char *ssr_name) +{ + struct qcom_ssr_subsystem *info; + + info = qcom_ssr_get_subsys(ssr_name); + if (IS_ERR(info)) { + dev_err(&rproc->dev, "Failed to add ssr subdevice\n"); + return; + } + + ssr->info = info; + ssr->subdev.prepare = ssr_notify_prepare; + ssr->subdev.start = ssr_notify_start; + ssr->subdev.stop = ssr_notify_stop; + ssr->subdev.unprepare = ssr_notify_unprepare; + + rproc_add_subdev(rproc, &ssr->subdev); +} +EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev); + +/** + * qcom_remove_ssr_subdev() - remove subdevice as restart notification source + * @rproc: rproc handle + * @ssr: SSR subdevice handle + */ +void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr) +{ + rproc_remove_subdev(rproc, &ssr->subdev); + ssr->info = NULL; +} +EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev); + +MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver"); +MODULE_LICENSE("GPL v2"); |