// SPDX-License-Identifier: GPL-2.0+
/*
 * Amlogic Meson-AXG Clock Controller Driver
 *
 * Copyright (c) 2016 BayLibre, SAS.
 * Author: Neil Armstrong <narmstrong@baylibre.com>
 *
 * Copyright (c) 2018 Amlogic, inc.
 * Author: Qiufang Dai <qiufang.dai@amlogic.com>
 * Author: Yixun Lan <yixun.lan@amlogic.com>
 */

#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/module.h>

#include <linux/slab.h>
#include "meson-aoclk.h"
#include "clk-regmap.h"

static int meson_aoclk_do_reset(struct reset_controller_dev *rcdev,
                               unsigned long id)
{
        struct meson_aoclk_reset_controller *rstc =
                container_of(rcdev, struct meson_aoclk_reset_controller, reset);

        return regmap_write(rstc->regmap, rstc->data->reset_reg,
                            BIT(rstc->data->reset[id]));
}

static const struct reset_control_ops meson_aoclk_reset_ops = {
        .reset = meson_aoclk_do_reset,
};

int meson_aoclkc_probe(struct platform_device *pdev)
{
        struct meson_aoclk_reset_controller *rstc;
        const struct meson_clkc_data *clkc_data;
        const struct meson_aoclk_data *data;
        struct device *dev = &pdev->dev;
        struct device_node *np;
        struct regmap *regmap;
        int ret;

        clkc_data = of_device_get_match_data(dev);
        if (!clkc_data)
                return -EINVAL;

        ret = meson_clkc_syscon_probe(pdev);
        if (ret)
                return ret;

        data = container_of(clkc_data, struct meson_aoclk_data,
                            clkc_data);

        rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL);
        if (!rstc)
                return -ENOMEM;

        np = of_get_parent(dev->of_node);
        regmap = syscon_node_to_regmap(np);
        of_node_put(np);
        if (IS_ERR(regmap)) {
                dev_err(dev, "failed to get regmap\n");
                return PTR_ERR(regmap);
        }

        /* Reset Controller */
        rstc->data = data;
        rstc->regmap = regmap;
        rstc->reset.ops = &meson_aoclk_reset_ops;
        rstc->reset.nr_resets = data->num_reset;
        rstc->reset.of_node = dev->of_node;
        ret = devm_reset_controller_register(dev, &rstc->reset);
        if (ret) {
                dev_err(dev, "failed to register reset controller\n");
                return ret;
        }

        return 0;
}
EXPORT_SYMBOL_NS_GPL(meson_aoclkc_probe, "CLK_MESON");

MODULE_DESCRIPTION("Amlogic Always-ON Clock Controller helpers");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("CLK_MESON");