reset-meson.c

  1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
  2/*
  3 * Amlogic Meson Reset Controller driver
  4 *
  5 * Copyright (c) 2016-2024 BayLibre, SAS.
  6 * Authors: Neil Armstrong <narmstrong@baylibre.com>
  7 *          Jerome Brunet <jbrunet@baylibre.com>
  8 */
  9
 10#include <linux/err.h>
 11#include <linux/io.h>
 12#include <linux/of.h>
 13#include <linux/module.h>
 14#include <linux/platform_device.h>
 15#include <linux/regmap.h>
 16#include <linux/reset-controller.h>
 17
 18#include "reset-meson.h"
 19
 20static const struct meson_reset_param meson8b_param = {
 21	.reset_ops	= &meson_reset_ops,
 22	.reset_num	= 256,
 23	.reset_offset	= 0x0,
 24	.level_offset	= 0x7c,
 25	.level_low_reset = true,
 26};
 27
 28static const struct meson_reset_param meson_a1_param = {
 29	.reset_ops	= &meson_reset_ops,
 30	.reset_num	= 96,
 31	.reset_offset	= 0x0,
 32	.level_offset	= 0x40,
 33	.level_low_reset = true,
 34};
 35
 36static const struct meson_reset_param meson_s4_param = {
 37	.reset_ops	= &meson_reset_ops,
 38	.reset_num	= 192,
 39	.reset_offset	= 0x0,
 40	.level_offset	= 0x40,
 41	.level_low_reset = true,
 42};
 43
 44static const struct meson_reset_param t7_param = {
 45	.reset_num      = 224,
 46	.reset_offset	= 0x0,
 47	.level_offset   = 0x40,
 48	.level_low_reset = true,
 49};
 50
 51static const struct of_device_id meson_reset_dt_ids[] = {
 52	 { .compatible = "amlogic,meson8b-reset",    .data = &meson8b_param},
 53	 { .compatible = "amlogic,meson-gxbb-reset", .data = &meson8b_param},
 54	 { .compatible = "amlogic,meson-axg-reset",  .data = &meson8b_param},
 55	 { .compatible = "amlogic,meson-a1-reset",   .data = &meson_a1_param},
 56	 { .compatible = "amlogic,meson-s4-reset",   .data = &meson_s4_param},
 57	 { .compatible = "amlogic,c3-reset",   .data = &meson_s4_param},
 58	 { .compatible = "amlogic,t7-reset",   .data = &t7_param},
 59	 { /* sentinel */ },
 60};
 61MODULE_DEVICE_TABLE(of, meson_reset_dt_ids);
 62
 63static const struct regmap_config regmap_config = {
 64	.reg_bits   = 32,
 65	.val_bits   = 32,
 66	.reg_stride = 4,
 67};
 68
 69static int meson_reset_probe(struct platform_device *pdev)
 70{
 71	const struct meson_reset_param *param;
 72	struct device *dev = &pdev->dev;
 73	struct regmap *map;
 74	void __iomem *base;
 75
 76	base = devm_platform_ioremap_resource(pdev, 0);
 77	if (IS_ERR(base))
 78		return PTR_ERR(base);
 79
 80	param = device_get_match_data(dev);
 81	if (!param)
 82		return -ENODEV;
 83
 84	map = devm_regmap_init_mmio(dev, base, &regmap_config);
 85	if (IS_ERR(map))
 86		return dev_err_probe(dev, PTR_ERR(map),
 87				     "can't init regmap mmio region\n");
 88
 89	return meson_reset_controller_register(dev, map, param);
 90}
 91
 92static struct platform_driver meson_reset_driver = {
 93	.probe	= meson_reset_probe,
 94	.driver = {
 95		.name		= "meson_reset",
 96		.of_match_table	= meson_reset_dt_ids,
 97	},
 98};
 99module_platform_driver(meson_reset_driver);
100
101MODULE_DESCRIPTION("Amlogic Meson Reset Controller driver");
102MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
103MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
104MODULE_LICENSE("Dual BSD/GPL");
105MODULE_IMPORT_NS("MESON_RESET");