// SPDX-License-Identifier: GPL-2.0+
//
// OWL common clock driver
//
// Copyright (c) 2014 Actions Semi Inc.
// Author: David Liu <liuwei@actions-semi.com>
//
// Copyright (c) 2018 Linaro Ltd.
// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

#include <linux/platform_device.h>
#include <linux/regmap.h>

#include "owl-common.h"

static const struct regmap_config owl_regmap_config = {
        .reg_bits       = 32,
        .reg_stride     = 4,
        .val_bits       = 32,
        .max_register   = 0x00cc,
};

static void owl_clk_set_regmap(const struct owl_clk_desc *desc,
                         struct regmap *regmap)
{
        int i;
        struct owl_clk_common *clks;

        for (i = 0; i < desc->num_clks; i++) {
                clks = desc->clks[i];
                if (!clks)
                        continue;

                clks->regmap = regmap;
        }
}

int owl_clk_regmap_init(struct platform_device *pdev,
                        struct owl_clk_desc *desc)
{
        void __iomem *base;
        struct regmap *regmap;

        base = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(base))
                return PTR_ERR(base);

        regmap = devm_regmap_init_mmio(&pdev->dev, base, &owl_regmap_config);
        if (IS_ERR(regmap)) {
                pr_err("failed to init regmap\n");
                return PTR_ERR(regmap);
        }

        owl_clk_set_regmap(desc, regmap);
        desc->regmap = regmap;

        return 0;
}

int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
{
        int i, ret;
        struct clk_hw *hw;

        for (i = 0; i < hw_clks->num; i++) {
                const char *name;

                hw = hw_clks->hws[i];
                if (IS_ERR_OR_NULL(hw))
                        continue;

                name = hw->init->name;
                ret = devm_clk_hw_register(dev, hw);
                if (ret) {
                        dev_err(dev, "Couldn't register clock %d - %s\n",
                                i, name);
                        return ret;
                }
        }

        ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_clks);
        if (ret)
                dev_err(dev, "Failed to add clock provider\n");

        return ret;
}