// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2011-2017, The Linux Foundation. All rights reserved. // Copyright (c) 2018, Linaro Limited #include <linux/kernel.h> #include <linux/module.h> #include <linux/device.h> #include <linux/spinlock.h> #include <linux/idr.h> #include <linux/slab.h> #include <linux/of_device.h> #include <linux/soc/qcom/apr.h> #include <linux/rpmsg.h> #include <linux/of.h> struct apr { struct rpmsg_endpoint *ch; struct device *dev; spinlock_t svcs_lock; struct idr svcs_idr; int dest_domain_id; }; /** * apr_send_pkt() - Send a apr message from apr device * * @adev: Pointer to previously registered apr device. * @pkt: Pointer to apr packet to send * * Return: Will be an negative on packet size on success. */ int apr_send_pkt(struct apr_device *adev, struct apr_pkt *pkt) { struct apr *apr = dev_get_drvdata(adev->dev.parent); struct apr_hdr *hdr; unsigned long flags; int ret; spin_lock_irqsave(&adev->lock, flags); hdr = &pkt->hdr; hdr->src_domain = APR_DOMAIN_APPS; hdr->src_svc = adev->svc_id; hdr->dest_domain = adev->domain_id; hdr->dest_svc = adev->svc_id; ret = rpmsg_trysend(apr->ch, pkt, hdr->pkt_size); spin_unlock_irqrestore(&adev->lock, flags); return ret ? ret : hdr->pkt_size; } EXPORT_SYMBOL_GPL(apr_send_pkt); static void apr_dev_release(struct device *dev) { struct apr_device *adev = to_apr_device(dev); kfree(adev); } static int apr_callback(struct rpmsg_device *rpdev, void *buf, int len, void *priv, u32 addr) { struct apr *apr = dev_get_drvdata(&rpdev->dev); uint16_t hdr_size, msg_type, ver, svc_id; struct apr_device *svc = NULL; struct apr_driver *adrv = NULL; struct apr_resp_pkt resp; struct apr_hdr *hdr; unsigned long flags; if (len <= APR_HDR_SIZE) { dev_err(apr->dev, "APR: Improper apr pkt received:%p %d\n", buf, len); return -EINVAL; } hdr = buf; ver = APR_HDR_FIELD_VER(hdr->hdr_field); if (ver > APR_PKT_VER + 1) return -EINVAL; hdr_size = APR_HDR_FIELD_SIZE_BYTES(hdr->hdr_field); if (hdr_size < APR_HDR_SIZE) { dev_err(apr->dev, "APR: Wrong hdr size:%d\n", hdr_size); return -EINVAL; } if (hdr->pkt_size < APR_HDR_SIZE || hdr->pkt_size != len) { dev_err(apr->dev, "APR: Wrong packet size\n"); return -EINVAL; } msg_type = APR_HDR_FIELD_MT(hdr->hdr_field); if (msg_type >= APR_MSG_TYPE_MAX) { dev_err(apr->dev, "APR: Wrong message type: %d\n", msg_type); return -EINVAL; } if (hdr->src_domain >= APR_DOMAIN_MAX || hdr->dest_domain >= APR_DOMAIN_MAX || hdr->src_svc >= APR_SVC_MAX || hdr->dest_svc >= APR_SVC_MAX) { dev_err(apr->dev, "APR: Wrong APR header\n"); return -EINVAL; } svc_id = hdr->dest_svc; spin_lock_irqsave(&apr->svcs_lock, flags); svc = idr_find(&apr->svcs_idr, svc_id); if (svc && svc->dev.driver) adrv = to_apr_driver(svc->dev.driver); spin_unlock_irqrestore(&apr->svcs_lock, flags); if (!adrv) { dev_err(apr->dev, "APR: service is not registered\n"); return -EINVAL; } resp.hdr = *hdr; resp.payload_size = hdr->pkt_size - hdr_size; /* * NOTE: hdr_size is not same as APR_HDR_SIZE as remote can include * optional headers in to apr_hdr which should be ignored */ if (resp.payload_size > 0) resp.payload = buf + hdr_size; adrv->callback(svc, &resp); return 0; } static int apr_device_match(struct device *dev, struct device_driver *drv) { struct apr_device *adev = to_apr_device(dev); struct apr_driver *adrv = to_apr_driver(drv); const struct apr_device_id *id = adrv->id_table; /* Attempt an OF style match first */ if (of_driver_match_device(dev, drv)) return 1; if (!id) return 0; while (id->domain_id != 0 || id->svc_id != 0) { if (id->domain_id == adev->domain_id && id->svc_id == adev->svc_id) return 1; id++; } return 0; } static int apr_device_probe(struct device *dev) { struct apr_device *adev = to_apr_device(dev); struct apr_driver *adrv = to_apr_driver(dev->driver); return adrv->probe(adev); } static int apr_device_remove(struct device *dev) { struct apr_device *adev = to_apr_device(dev); struct apr_driver *adrv; struct apr *apr = dev_get_drvdata(adev->dev.parent); if (dev->driver) { adrv = to_apr_driver(dev->driver); if (adrv->remove) adrv->remove(adev); spin_lock(&apr->svcs_lock); idr_remove(&apr->svcs_idr, adev->svc_id); spin_unlock(&apr->svcs_lock); } return 0; } static int apr_uevent(struct device *dev, struct kobj_uevent_env *env) { struct apr_device *adev = to_apr_device(dev); int ret; ret = of_device_uevent_modalias(dev, env); if (ret != -ENODEV) return ret; return add_uevent_var(env, "MODALIAS=apr:%s", adev->name); } struct bus_type aprbus = { .name = "aprbus", .match = apr_device_match, .probe = apr_device_probe, .uevent = apr_uevent, .remove = apr_device_remove, }; EXPORT_SYMBOL_GPL(aprbus); static int apr_add_device(struct device *dev, struct device_node *np, const struct apr_device_id *id) { struct apr *apr = dev_get_drvdata(dev); struct apr_device *adev = NULL; int ret; adev = kzalloc(sizeof(*adev), GFP_KERNEL); if (!adev) return -ENOMEM; spin_lock_init(&adev->lock); adev->svc_id = id->svc_id; adev->domain_id = id->domain_id; adev->version = id->svc_version; if (np) snprintf(adev->name, APR_NAME_SIZE, "%pOFn", np); else strscpy(adev->name, id->name, APR_NAME_SIZE); dev_set_name(&adev->dev, "aprsvc:%s:%x:%x", adev->name, id->domain_id, id->svc_id); adev->dev.bus = &aprbus; adev->dev.parent = dev; adev->dev.of_node = np; adev->dev.release = apr_dev_release; adev->dev.driver = NULL; spin_lock(&apr->svcs_lock); idr_alloc(&apr->svcs_idr, adev, id->svc_id, id->svc_id + 1, GFP_ATOMIC); spin_unlock(&apr->svcs_lock); dev_info(dev, "Adding APR dev: %s\n", dev_name(&adev->dev)); ret = device_register(&adev->dev); if (ret) { dev_err(dev, "device_register failed: %d\n", ret); put_device(&adev->dev); } return ret; } static void of_register_apr_devices(struct device *dev) { struct apr *apr = dev_get_drvdata(dev); struct device_node *node; for_each_child_of_node(dev->of_node, node) { struct apr_device_id id = { {0} }; if (of_property_read_u32(node, "reg", &id.svc_id)) continue; id.domain_id = apr->dest_domain_id; if (apr_add_device(dev, node, &id)) dev_err(dev, "Failed to add apr %d svc\n", id.svc_id); } } static int apr_probe(struct rpmsg_device *rpdev) { struct device *dev = &rpdev->dev; struct apr *apr; int ret; apr = devm_kzalloc(dev, sizeof(*apr), GFP_KERNEL); if (!apr) return -ENOMEM; ret = of_property_read_u32(dev->of_node, "reg", &apr->dest_domain_id); if (ret) { dev_err(dev, "APR Domain ID not specified in DT\n"); return ret; } dev_set_drvdata(dev, apr); apr->ch = rpdev->ept; apr->dev = dev; spin_lock_init(&apr->svcs_lock); idr_init(&apr->svcs_idr); of_register_apr_devices(dev); return 0; } static int apr_remove_device(struct device *dev, void *null) { struct apr_device *adev = to_apr_device(dev); device_unregister(&adev->dev); return 0; } static void apr_remove(struct rpmsg_device *rpdev) { device_for_each_child(&rpdev->dev, NULL, apr_remove_device); } /* * __apr_driver_register() - Client driver registration with aprbus * * @drv:Client driver to be associated with client-device. * @owner: owning module/driver * * This API will register the client driver with the aprbus * It is called from the driver's module-init function. */ int __apr_driver_register(struct apr_driver *drv, struct module *owner) { drv->driver.bus = &aprbus; drv->driver.owner = owner; return driver_register(&drv->driver); } EXPORT_SYMBOL_GPL(__apr_driver_register); /* * apr_driver_unregister() - Undo effect of apr_driver_register * * @drv: Client driver to be unregistered */ void apr_driver_unregister(struct apr_driver *drv) { driver_unregister(&drv->driver); } EXPORT_SYMBOL_GPL(apr_driver_unregister); static const struct of_device_id apr_of_match[] = { { .compatible = "qcom,apr"}, { .compatible = "qcom,apr-v2"}, {} }; MODULE_DEVICE_TABLE(of, apr_of_match); static struct rpmsg_driver apr_driver = { .probe = apr_probe, .remove = apr_remove, .callback = apr_callback, .drv = { .name = "qcom,apr", .of_match_table = apr_of_match, }, }; static int __init apr_init(void) { int ret; ret = bus_register(&aprbus); if (!ret) ret = register_rpmsg_driver(&apr_driver); else bus_unregister(&aprbus); return ret; } static void __exit apr_exit(void) { bus_unregister(&aprbus); unregister_rpmsg_driver(&apr_driver); } subsys_initcall(apr_init); module_exit(apr_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("Qualcomm APR Bus");