diff options
Diffstat (limited to 'remoteproc/ethosu_bridge_reset.c')
-rw-r--r-- | remoteproc/ethosu_bridge_reset.c | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/remoteproc/ethosu_bridge_reset.c b/remoteproc/ethosu_bridge_reset.c deleted file mode 100644 index 7f73ee7..0000000 --- a/remoteproc/ethosu_bridge_reset.c +++ /dev/null @@ -1,157 +0,0 @@ -/* - * Copyright (c) 2021 Arm Limited. All rights reserved. - * - * 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. - * - * SPDX-License-Identifier: GPL-2.0-only - */ - -#include <linux/io.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/of.h> -#include <linux/of_device.h> -#include <linux/platform_device.h> -#include <linux/reset-controller.h> - -#define ETHOSU_BRIDGE_RESET_DRIVER_VERSION "0.0.1" - -struct ethosu_reset { - struct reset_controller_dev rst; - struct device *dev; - void __iomem *base; -}; - -#define ETHOSU_BRIDGE_ID(base) (base) -#define ETHOSU_BRIDGE_CTRL(base) ((base) + 0x100) - -#define ETHOSU_BRIDGE_WAIT_ENABLE (0x2) -#define ETHOSU_BRIDGE_RESET (0x1) - -static void __iomem *bridge_verify_and_remap(struct device *dev, - struct resource *res) -{ - void __iomem *base = devm_ioremap_resource(dev, res); - u32 id; - u16 magic; - u8 minor; - u8 major; - - if (IS_ERR(base)) - return base; - - id = readl(ETHOSU_BRIDGE_ID(base)); - magic = id & 0x0000ffff; - minor = (id & 0x00ff0000) >> 16; - major = (id & 0xff000000) >> 24; - - dev_dbg(dev, "verifying bridge %d.%d", major, minor); - - if (magic != 0xBD9E) - return IOMEM_ERR_PTR(-EINVAL); - - return base; -} - -int ethosu_bridge_assert(struct reset_controller_dev *rcdev, - unsigned long id) -{ - struct ethosu_reset *ethosu = container_of(rcdev, struct ethosu_reset, - rst); - - /* pull reset */ - dev_dbg(ethosu->dev, "Asserting reset"); - - /* set wait and reset */ - writel(ETHOSU_BRIDGE_WAIT_ENABLE | ETHOSU_BRIDGE_RESET, - ETHOSU_BRIDGE_CTRL(ethosu->base)); - - return 0; -} - -int ethosu_bridge_deassert(struct reset_controller_dev *rcdev, - unsigned long id) -{ - struct ethosu_reset *ethosu = container_of(rcdev, struct ethosu_reset, - rst); - - /* release reset */ - dev_dbg(ethosu->dev, "Deasserting reset"); - writel(~ETHOSU_BRIDGE_WAIT_ENABLE & ETHOSU_BRIDGE_RESET, - ETHOSU_BRIDGE_CTRL(ethosu->base)); - - return 0; -} - -static struct reset_control_ops ethosu_reset_bridge_ops = { - .assert = ethosu_bridge_assert, - .deassert = ethosu_bridge_deassert, -}; - -static const struct of_device_id ethosu_reset_match[] = { - { .compatible = "arm,ethosu-bridge-reset", .data = 0 }, - { /* sentinel */ }, -}; - -static int ethosu_bridge_reset_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct ethosu_reset *ethosu; - struct resource *res; - - ethosu = devm_kzalloc(&pdev->dev, sizeof(*ethosu), GFP_KERNEL); - if (!ethosu) - return -ENOMEM; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - - ethosu->base = bridge_verify_and_remap(dev, res); - ethosu->dev = dev; - - if (IS_ERR(ethosu->base)) - return PTR_ERR(ethosu->base); - - platform_set_drvdata(pdev, ethosu); - - ethosu->rst.owner = THIS_MODULE; - ethosu->rst.nr_resets = 1; - ethosu->rst.ops = ðosu_reset_bridge_ops; - ethosu->rst.of_node = pdev->dev.of_node; - - dev_dbg(dev, "registering to reset controller core"); - - return devm_reset_controller_register(dev, ðosu->rst); -} - -static int ethosu_bridge_reset_remove(struct platform_device *pdev) -{ - return 0; -} - -static struct platform_driver ethosu_reset_driver = { - .probe = ethosu_bridge_reset_probe, - .remove = ethosu_bridge_reset_remove, - .driver = { - .name = "ethosu-bridge-reset", - .of_match_table = of_match_ptr(ethosu_reset_match), - }, -}; - -module_platform_driver(ethosu_reset_driver); - -MODULE_LICENSE("GPL v2"); -MODULE_AUTHOR("Arm Ltd"); -MODULE_DESCRIPTION("Arm Ethos-U NPU Bridge Reset Driver"); -MODULE_VERSION(ETHOSU_BRIDGE_RESET_DRIVER_VERSION); |