diff options
Diffstat (limited to 'kernel/common/ethosu_driver.c')
| -rw-r--r-- | kernel/common/ethosu_driver.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/kernel/common/ethosu_driver.c b/kernel/common/ethosu_driver.c new file mode 100644 index 0000000..15f13b5 --- /dev/null +++ b/kernel/common/ethosu_driver.c @@ -0,0 +1,161 @@ +/* + * SPDX-FileCopyrightText: Copyright 2020-2024 Arm Limited and/or its affiliates <open-source-office@arm.com> + * SPDX-License-Identifier: GPL-2.0-only + * + * This program is free software and is provided to you under the terms of the + * GNU General Public License version 2 as published by the Free Software + * Foundation, and any use by you of this program is subject to the terms + * of such GNU licence. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. + */ + +#include <common/ethosu_device.h> +#include <uapi/ethosu.h> + +#include <linux/bitmap.h> +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/rpmsg.h> + +/**************************************************************************** + * Defines + ****************************************************************************/ + +#define ETHOSU_DRIVER_STR(s) #s +#define ETHOSU_DRIVER_VERSION_STR(major, minor, patch) \ + ETHOSU_DRIVER_STR(major) "." \ + ETHOSU_DRIVER_STR(minor) "." \ + ETHOSU_DRIVER_STR(patch) +#define ETHOSU_DRIVER_VERSION ETHOSU_DRIVER_VERSION_STR( \ + ETHOSU_KERNEL_DRIVER_VERSION_MAJOR, \ + ETHOSU_KERNEL_DRIVER_VERSION_MINOR, \ + ETHOSU_KERNEL_DRIVER_VERSION_PATCH) + +#define ETHOSU_DRIVER_NAME "ethosu" + +#define MINOR_BASE 0 /* Minor version starts at 0 */ +#define MINOR_COUNT 64 /* Allocate minor versions */ + +/**************************************************************************** + * Variables + ****************************************************************************/ + +static struct class *ethosu_class; + +static dev_t devt; + +/**************************************************************************** + * Rpmsg driver + ****************************************************************************/ + +static int ethosu_rpmsg_probe(struct rpmsg_device *rpdev) +{ + int ret; + + /* Initialize device */ + ret = ethosu_dev_init(rpdev, ethosu_class, devt); + if (ret) + return ret; + + return 0; +} + +static void ethosu_rpmsg_remove(struct rpmsg_device *rpdev) +{ + ethosu_dev_deinit(rpdev); +} + +static int ethosu_rpmsg_cb(struct rpmsg_device *rpdev, + void *data, + int len, + void *priv, + u32 src) +{ + dev_err(&rpdev->dev, "%s", __FUNCTION__); + + return -EINVAL; +} + +static struct rpmsg_device_id ethosu_rpmsg_driver_id_table[] = { + { .name = "ethos-u-0.0" }, + {}, +}; + +MODULE_DEVICE_TABLE(rpmsg, ethosu_rpmsg_driver_id_table); + +static struct rpmsg_driver ethosu_rpmsg_driver = { + .drv = { + .name = ETHOSU_DRIVER_NAME, + .owner = THIS_MODULE, + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, + .id_table = ethosu_rpmsg_driver_id_table, + .probe = ethosu_rpmsg_probe, + .callback = ethosu_rpmsg_cb, + .remove = ethosu_rpmsg_remove, +}; + +/**************************************************************************** + * Module init and exit + ****************************************************************************/ + +static void __exit ethosu_exit(void) +{ + unregister_rpmsg_driver(ðosu_rpmsg_driver); + unregister_chrdev_region(devt, MINOR_COUNT); + class_destroy(ethosu_class); +} + +static int __init ethosu_init(void) +{ + int ret; + + ethosu_class = class_create(THIS_MODULE, ETHOSU_DRIVER_NAME); + if (IS_ERR(ethosu_class)) { + pr_err("Failed to create class '%s'.\n", ETHOSU_DRIVER_NAME); + + return PTR_ERR(ethosu_class); + } + + ret = alloc_chrdev_region(&devt, MINOR_BASE, MINOR_COUNT, + ETHOSU_DRIVER_NAME); + if (ret) { + pr_err("Failed to allocate chrdev region.\n"); + goto destroy_class; + } + + ret = register_rpmsg_driver(ðosu_rpmsg_driver); + if (ret) { + pr_err("Failed to register Arm Ethos-U rpmsg driver.\n"); + goto region_unregister; + } + + return 0; + +region_unregister: + unregister_chrdev_region(devt, MINOR_COUNT); + +destroy_class: + class_destroy(ethosu_class); + + return ret; +} + +module_init(ethosu_init) +module_exit(ethosu_exit) + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Arm Ltd"); +MODULE_DESCRIPTION("Arm Ethos-U NPU Driver"); +MODULE_VERSION(ETHOSU_DRIVER_VERSION); |