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fb4c31587a
Add support for the reset controller present in the audio clock controller of the g12 and sm1 SoC families, using the auxiliary bus. This is expected to replace the driver currently present directly within the related clock driver. Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Link: https://lore.kernel.org/r/20240910-meson-rst-aux-v5-9-60be62635d3e@baylibre.com Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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/*
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* Amlogic Meson Reset Auxiliary driver
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*
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* Copyright (c) 2024 BayLibre, SAS.
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* Author: Jerome Brunet <jbrunet@baylibre.com>
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/auxiliary_bus.h>
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#include <linux/regmap.h>
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#include <linux/reset-controller.h>
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#include <linux/slab.h>
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#include "reset-meson.h"
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#include <soc/amlogic/reset-meson-aux.h>
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static DEFINE_IDA(meson_rst_aux_ida);
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struct meson_reset_adev {
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struct auxiliary_device adev;
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struct regmap *map;
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};
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#define to_meson_reset_adev(_adev) \
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container_of((_adev), struct meson_reset_adev, adev)
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static const struct meson_reset_param meson_g12a_audio_param = {
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.reset_ops = &meson_reset_toggle_ops,
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.reset_num = 26,
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.level_offset = 0x24,
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};
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static const struct meson_reset_param meson_sm1_audio_param = {
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.reset_ops = &meson_reset_toggle_ops,
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.reset_num = 39,
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.level_offset = 0x28,
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};
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static const struct auxiliary_device_id meson_reset_aux_ids[] = {
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{
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.name = "axg-audio-clkc.rst-g12a",
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.driver_data = (kernel_ulong_t)&meson_g12a_audio_param,
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}, {
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.name = "axg-audio-clkc.rst-sm1",
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.driver_data = (kernel_ulong_t)&meson_sm1_audio_param,
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}, {}
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};
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MODULE_DEVICE_TABLE(auxiliary, meson_reset_aux_ids);
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static int meson_reset_aux_probe(struct auxiliary_device *adev,
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const struct auxiliary_device_id *id)
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{
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const struct meson_reset_param *param =
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(const struct meson_reset_param *)(id->driver_data);
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struct meson_reset_adev *raux =
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to_meson_reset_adev(adev);
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return meson_reset_controller_register(&adev->dev, raux->map, param);
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}
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static struct auxiliary_driver meson_reset_aux_driver = {
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.probe = meson_reset_aux_probe,
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.id_table = meson_reset_aux_ids,
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};
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module_auxiliary_driver(meson_reset_aux_driver);
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static void meson_rst_aux_release(struct device *dev)
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{
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struct auxiliary_device *adev = to_auxiliary_dev(dev);
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struct meson_reset_adev *raux =
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to_meson_reset_adev(adev);
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ida_free(&meson_rst_aux_ida, adev->id);
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kfree(raux);
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}
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static void meson_rst_aux_unregister_adev(void *_adev)
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{
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struct auxiliary_device *adev = _adev;
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auxiliary_device_delete(adev);
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auxiliary_device_uninit(adev);
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}
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int devm_meson_rst_aux_register(struct device *dev,
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struct regmap *map,
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const char *adev_name)
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{
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struct meson_reset_adev *raux;
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struct auxiliary_device *adev;
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int ret;
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raux = kzalloc(sizeof(*raux), GFP_KERNEL);
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if (!raux)
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return -ENOMEM;
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ret = ida_alloc(&meson_rst_aux_ida, GFP_KERNEL);
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if (ret < 0)
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goto raux_free;
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raux->map = map;
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adev = &raux->adev;
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adev->id = ret;
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adev->name = adev_name;
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adev->dev.parent = dev;
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adev->dev.release = meson_rst_aux_release;
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device_set_of_node_from_dev(&adev->dev, dev);
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ret = auxiliary_device_init(adev);
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if (ret)
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goto ida_free;
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ret = __auxiliary_device_add(adev, dev->driver->name);
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if (ret) {
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auxiliary_device_uninit(adev);
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return ret;
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}
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return devm_add_action_or_reset(dev, meson_rst_aux_unregister_adev,
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adev);
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ida_free:
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ida_free(&meson_rst_aux_ida, adev->id);
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raux_free:
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kfree(raux);
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return ret;
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}
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EXPORT_SYMBOL_GPL(devm_meson_rst_aux_register);
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MODULE_DESCRIPTION("Amlogic Meson Reset Auxiliary driver");
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MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_IMPORT_NS(MESON_RESET);
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