// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2019 Samsung Electronics Co., Ltd.
 *	      http://www.samsung.com/
 * Copyright (c) 2020 Krzysztof Kozlowski <krzk@kernel.org>
 *
 * Exynos - CHIP ID support
 * Author: Pankaj Dubey <pankaj.dubey@samsung.com>
 * Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
 * Author: Krzysztof Kozlowski <krzk@kernel.org>
 *
 * Samsung Exynos SoC Adaptive Supply Voltage and Chip ID support
 */

#include <linux/device.h>
#include <linux/errno.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/soc/samsung/exynos-chipid.h>
#include <linux/sys_soc.h>

#include "exynos-asv.h"

static const struct exynos_soc_id {
	const char *name;
	unsigned int id;
} soc_ids[] = {
	/* List ordered by SoC name */
	{ "EXYNOS3250", 0xE3472000 },
	{ "EXYNOS4210", 0x43200000 },	/* EVT0 revision */
	{ "EXYNOS4210", 0x43210000 },
	{ "EXYNOS4212", 0x43220000 },
	{ "EXYNOS4412", 0xE4412000 },
	{ "EXYNOS5250", 0x43520000 },
	{ "EXYNOS5260", 0xE5260000 },
	{ "EXYNOS5410", 0xE5410000 },
	{ "EXYNOS5420", 0xE5420000 },
	{ "EXYNOS5433", 0xE5433000 },
	{ "EXYNOS5440", 0xE5440000 },
	{ "EXYNOS5800", 0xE5422000 },
	{ "EXYNOS7420", 0xE7420000 },
};

static const char *product_id_to_soc_id(unsigned int product_id)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
		if ((product_id & EXYNOS_MASK) == soc_ids[i].id)
			return soc_ids[i].name;
	return NULL;
}

static int exynos_chipid_probe(struct platform_device *pdev)
{
	struct soc_device_attribute *soc_dev_attr;
	struct soc_device *soc_dev;
	struct device_node *root;
	struct regmap *regmap;
	u32 product_id;
	u32 revision;
	int ret;

	regmap = device_node_to_regmap(pdev->dev.of_node);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
	if (ret < 0)
		return ret;

	revision = product_id & EXYNOS_REV_MASK;

	soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
				    GFP_KERNEL);
	if (!soc_dev_attr)
		return -ENOMEM;

	soc_dev_attr->family = "Samsung Exynos";

	root = of_find_node_by_path("/");
	of_property_read_string(root, "model", &soc_dev_attr->machine);
	of_node_put(root);

	soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL,
						"%x", revision);
	soc_dev_attr->soc_id = product_id_to_soc_id(product_id);
	if (!soc_dev_attr->soc_id) {
		pr_err("Unknown SoC\n");
		return -ENODEV;
	}

	/* please note that the actual registration will be deferred */
	soc_dev = soc_device_register(soc_dev_attr);
	if (IS_ERR(soc_dev))
		return PTR_ERR(soc_dev);

	ret = exynos_asv_init(&pdev->dev, regmap);
	if (ret)
		goto err;

	platform_set_drvdata(pdev, soc_dev);

	dev_info(soc_device_to_device(soc_dev),
		 "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
		 soc_dev_attr->soc_id, product_id, revision);

	return 0;

err:
	soc_device_unregister(soc_dev);

	return ret;
}

static int exynos_chipid_remove(struct platform_device *pdev)
{
	struct soc_device *soc_dev = platform_get_drvdata(pdev);

	soc_device_unregister(soc_dev);

	return 0;
}

static const struct of_device_id exynos_chipid_of_device_ids[] = {
	{ .compatible = "samsung,exynos4210-chipid" },
	{}
};

static struct platform_driver exynos_chipid_driver = {
	.driver = {
		.name = "exynos-chipid",
		.of_match_table = exynos_chipid_of_device_ids,
	},
	.probe	= exynos_chipid_probe,
	.remove	= exynos_chipid_remove,
};
builtin_platform_driver(exynos_chipid_driver);