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1b5adb40cd
This function call was found to be unnecessary as there is no equivalent platform_get_drvdata() call to access the private data of the driver. Also, the private data is defined in this driver, so there is no risk of it being accessed outside of this driver file. Reviewed-by: Alexandru Ardelean <alex@shruggie.ro> Signed-off-by: Andrei Coardos <aboutphysycs@gmail.com> Link: https://lore.kernel.org/r/20230807105400.11560-1-aboutphysycs@gmail.com Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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/*
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* Amlogic Meson Reset Controller driver
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*
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* Copyright (c) 2016 BayLibre, SAS.
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/reset-controller.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#define BITS_PER_REG 32
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struct meson_reset_param {
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int reg_count;
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int level_offset;
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};
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struct meson_reset {
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void __iomem *reg_base;
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const struct meson_reset_param *param;
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struct reset_controller_dev rcdev;
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spinlock_t lock;
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};
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static int meson_reset_reset(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct meson_reset *data =
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container_of(rcdev, struct meson_reset, rcdev);
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unsigned int bank = id / BITS_PER_REG;
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unsigned int offset = id % BITS_PER_REG;
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void __iomem *reg_addr = data->reg_base + (bank << 2);
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writel(BIT(offset), reg_addr);
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return 0;
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}
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static int meson_reset_level(struct reset_controller_dev *rcdev,
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unsigned long id, bool assert)
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{
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struct meson_reset *data =
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container_of(rcdev, struct meson_reset, rcdev);
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unsigned int bank = id / BITS_PER_REG;
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unsigned int offset = id % BITS_PER_REG;
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void __iomem *reg_addr;
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unsigned long flags;
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u32 reg;
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reg_addr = data->reg_base + data->param->level_offset + (bank << 2);
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spin_lock_irqsave(&data->lock, flags);
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reg = readl(reg_addr);
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if (assert)
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writel(reg & ~BIT(offset), reg_addr);
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else
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writel(reg | BIT(offset), reg_addr);
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spin_unlock_irqrestore(&data->lock, flags);
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return 0;
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}
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static int meson_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return meson_reset_level(rcdev, id, true);
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}
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static int meson_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return meson_reset_level(rcdev, id, false);
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}
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static const struct reset_control_ops meson_reset_ops = {
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.reset = meson_reset_reset,
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.assert = meson_reset_assert,
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.deassert = meson_reset_deassert,
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};
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static const struct meson_reset_param meson8b_param = {
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.reg_count = 8,
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.level_offset = 0x7c,
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};
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static const struct meson_reset_param meson_a1_param = {
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.reg_count = 3,
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.level_offset = 0x40,
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};
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static const struct meson_reset_param meson_s4_param = {
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.reg_count = 6,
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.level_offset = 0x40,
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};
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static const struct of_device_id meson_reset_dt_ids[] = {
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{ .compatible = "amlogic,meson8b-reset", .data = &meson8b_param},
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{ .compatible = "amlogic,meson-gxbb-reset", .data = &meson8b_param},
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{ .compatible = "amlogic,meson-axg-reset", .data = &meson8b_param},
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{ .compatible = "amlogic,meson-a1-reset", .data = &meson_a1_param},
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{ .compatible = "amlogic,meson-s4-reset", .data = &meson_s4_param},
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, meson_reset_dt_ids);
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static int meson_reset_probe(struct platform_device *pdev)
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{
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struct meson_reset *data;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->reg_base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(data->reg_base))
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return PTR_ERR(data->reg_base);
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data->param = of_device_get_match_data(&pdev->dev);
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if (!data->param)
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return -ENODEV;
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spin_lock_init(&data->lock);
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data->rcdev.owner = THIS_MODULE;
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data->rcdev.nr_resets = data->param->reg_count * BITS_PER_REG;
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data->rcdev.ops = &meson_reset_ops;
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data->rcdev.of_node = pdev->dev.of_node;
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return devm_reset_controller_register(&pdev->dev, &data->rcdev);
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}
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static struct platform_driver meson_reset_driver = {
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.probe = meson_reset_probe,
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.driver = {
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.name = "meson_reset",
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.of_match_table = meson_reset_dt_ids,
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},
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};
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module_platform_driver(meson_reset_driver);
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MODULE_DESCRIPTION("Amlogic Meson Reset Controller driver");
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MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
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MODULE_LICENSE("Dual BSD/GPL");
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