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Release 4.14 drivers/reset/reset-meson.c

Directory: drivers/reset
/*
 * Amlogic Meson Reset Controller driver
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright (c) 2016 BayLibre, SAS.
 * Author: Neil Armstrong <narmstrong@baylibre.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * BSD LICENSE
 *
 * Copyright (c) 2016 BayLibre, SAS.
 * Author: Neil Armstrong <narmstrong@baylibre.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
#include <linux/types.h>


#define REG_COUNT	8

#define BITS_PER_REG	32


struct meson_reset {
	
void __iomem *reg_base;
	
struct reset_controller_dev rcdev;
};


static int meson_reset_reset(struct reset_controller_dev *rcdev, unsigned long id) { struct meson_reset *data = container_of(rcdev, struct meson_reset, rcdev); unsigned int bank = id / BITS_PER_REG; unsigned int offset = id % BITS_PER_REG; void __iomem *reg_addr = data->reg_base + (bank << 2); if (bank >= REG_COUNT) return -EINVAL; writel(BIT(offset), reg_addr); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Neil Armstrong84100.00%1100.00%
Total84100.00%1100.00%

static const struct reset_control_ops meson_reset_ops = { .reset = meson_reset_reset, }; static const struct of_device_id meson_reset_dt_ids[] = { { .compatible = "amlogic,meson8b-reset", }, { .compatible = "amlogic,meson-gxbb-reset", }, { /* sentinel */ }, };
static int meson_reset_probe(struct platform_device *pdev) { struct meson_reset *data; struct resource *res; data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); data->reg_base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(data->reg_base)) return PTR_ERR(data->reg_base); platform_set_drvdata(pdev, data); data->rcdev.owner = THIS_MODULE; data->rcdev.nr_resets = REG_COUNT * BITS_PER_REG; data->rcdev.ops = &meson_reset_ops; data->rcdev.of_node = pdev->dev.of_node; return devm_reset_controller_register(&pdev->dev, &data->rcdev); }

Contributors

PersonTokensPropCommitsCommitProp
Neil Armstrong150100.00%1100.00%
Total150100.00%1100.00%

static struct platform_driver meson_reset_driver = { .probe = meson_reset_probe, .driver = { .name = "meson_reset", .of_match_table = meson_reset_dt_ids, }, }; builtin_platform_driver(meson_reset_driver);

Overall Contributors

PersonTokensPropCommitsCommitProp
Neil Armstrong35099.15%150.00%
Paul Gortmaker30.85%150.00%
Total353100.00%2100.00%
Directory: drivers/reset
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