160 lines
4 KiB
C
160 lines
4 KiB
C
/*
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* Hisilicon Hi6220 reset controller driver
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*
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* Copyright (c) 2016 Linaro Limited.
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* Copyright (c) 2015-2016 Hisilicon Limited.
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*
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* Author: Feng Chen <puck.chen@hisilicon.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/io.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/bitops.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/mfd/syscon.h>
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#include <linux/reset-controller.h>
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#include <linux/reset.h>
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#include <linux/platform_device.h>
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#define PERIPH_ASSERT_OFFSET 0x300
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#define PERIPH_DEASSERT_OFFSET 0x304
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#define PERIPH_MAX_INDEX 0x509
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#define SC_MEDIA_RSTEN 0x052C
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#define SC_MEDIA_RSTDIS 0x0530
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#define MEDIA_MAX_INDEX 8
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#define to_reset_data(x) container_of(x, struct hi6220_reset_data, rc_dev)
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enum hi6220_reset_ctrl_type {
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PERIPHERAL,
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MEDIA,
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};
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struct hi6220_reset_data {
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struct reset_controller_dev rc_dev;
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struct regmap *regmap;
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};
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static int hi6220_peripheral_assert(struct reset_controller_dev *rc_dev,
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unsigned long idx)
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{
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struct hi6220_reset_data *data = to_reset_data(rc_dev);
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struct regmap *regmap = data->regmap;
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u32 bank = idx >> 8;
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u32 offset = idx & 0xff;
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u32 reg = PERIPH_ASSERT_OFFSET + bank * 0x10;
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return regmap_write(regmap, reg, BIT(offset));
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}
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static int hi6220_peripheral_deassert(struct reset_controller_dev *rc_dev,
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unsigned long idx)
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{
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struct hi6220_reset_data *data = to_reset_data(rc_dev);
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struct regmap *regmap = data->regmap;
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u32 bank = idx >> 8;
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u32 offset = idx & 0xff;
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u32 reg = PERIPH_DEASSERT_OFFSET + bank * 0x10;
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return regmap_write(regmap, reg, BIT(offset));
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}
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static const struct reset_control_ops hi6220_peripheral_reset_ops = {
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.assert = hi6220_peripheral_assert,
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.deassert = hi6220_peripheral_deassert,
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};
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static int hi6220_media_assert(struct reset_controller_dev *rc_dev,
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unsigned long idx)
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{
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struct hi6220_reset_data *data = to_reset_data(rc_dev);
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struct regmap *regmap = data->regmap;
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return regmap_write(regmap, SC_MEDIA_RSTEN, BIT(idx));
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}
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static int hi6220_media_deassert(struct reset_controller_dev *rc_dev,
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unsigned long idx)
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{
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struct hi6220_reset_data *data = to_reset_data(rc_dev);
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struct regmap *regmap = data->regmap;
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return regmap_write(regmap, SC_MEDIA_RSTDIS, BIT(idx));
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}
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static const struct reset_control_ops hi6220_media_reset_ops = {
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.assert = hi6220_media_assert,
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.deassert = hi6220_media_deassert,
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};
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static int hi6220_reset_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device *dev = &pdev->dev;
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enum hi6220_reset_ctrl_type type;
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struct hi6220_reset_data *data;
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struct regmap *regmap;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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type = (enum hi6220_reset_ctrl_type)of_device_get_match_data(dev);
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regmap = syscon_node_to_regmap(np);
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if (IS_ERR(regmap)) {
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dev_err(dev, "failed to get reset controller regmap\n");
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return PTR_ERR(regmap);
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}
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data->regmap = regmap;
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data->rc_dev.of_node = np;
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if (type == MEDIA) {
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data->rc_dev.ops = &hi6220_media_reset_ops;
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data->rc_dev.nr_resets = MEDIA_MAX_INDEX;
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} else {
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data->rc_dev.ops = &hi6220_peripheral_reset_ops;
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data->rc_dev.nr_resets = PERIPH_MAX_INDEX;
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}
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return reset_controller_register(&data->rc_dev);
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}
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static const struct of_device_id hi6220_reset_match[] = {
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{
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.compatible = "hisilicon,hi6220-sysctrl",
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.data = (void *)PERIPHERAL,
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},
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{
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.compatible = "hisilicon,hi6220-mediactrl",
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.data = (void *)MEDIA,
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},
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, hi6220_reset_match);
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static struct platform_driver hi6220_reset_driver = {
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.probe = hi6220_reset_probe,
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.driver = {
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.name = "reset-hi6220",
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.of_match_table = hi6220_reset_match,
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},
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};
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static int __init hi6220_reset_init(void)
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{
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return platform_driver_register(&hi6220_reset_driver);
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}
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postcore_initcall(hi6220_reset_init);
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MODULE_LICENSE("GPL v2");
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