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// 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/module.h>
#include <linux/of.h>
#include <linux/of_device.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"
struct exynos_chipid_variant {
unsigned int rev_reg; /* revision register offset */
unsigned int main_rev_shift; /* main revision offset in rev_reg */
unsigned int sub_rev_shift; /* sub revision offset in rev_reg */
};
struct exynos_chipid_info {
u32 product_id;
u32 revision;
};
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 },
{ "EXYNOS850", 0xE3830000 },
{ "EXYNOSAUTOV9", 0xAAA80000 },
};
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 == soc_ids[i].id)
return soc_ids[i].name;
return NULL;
}
static int exynos_chipid_get_chipid_info(struct regmap *regmap,
const struct exynos_chipid_variant *data,
struct exynos_chipid_info *soc_info)
{
int ret;
unsigned int val, main_rev, sub_rev;
ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val);
if (ret < 0)
return ret;
soc_info->product_id = val & EXYNOS_MASK;
if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) {
ret = regmap_read(regmap, data->rev_reg, &val);
if (ret < 0)
return ret;
}
main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;
soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev;
return 0;
}
static int exynos_chipid_probe(struct platform_device *pdev)
{
const struct exynos_chipid_variant *drv_data;
struct exynos_chipid_info soc_info;
struct soc_device_attribute *soc_dev_attr;
struct soc_device *soc_dev;
struct device_node *root;
struct regmap *regmap;
int ret;
drv_data = of_device_get_match_data(&pdev->dev);
if (!drv_data)
return -EINVAL;
regmap = device_node_to_regmap(pdev->dev.of_node);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info);
if (ret < 0)
return ret;
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", soc_info.revision);
soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.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(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
soc_dev_attr->soc_id, soc_info.product_id, soc_info.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 exynos_chipid_variant exynos4210_chipid_drv_data = {
.rev_reg = 0x0,
.main_rev_shift = 4,
.sub_rev_shift = 0,
};
static const struct exynos_chipid_variant exynos850_chipid_drv_data = {
.rev_reg = 0x10,
.main_rev_shift = 20,
.sub_rev_shift = 16,
};
static const struct of_device_id exynos_chipid_of_device_ids[] = {
{
.compatible = "samsung,exynos4210-chipid",
.data = &exynos4210_chipid_drv_data,
}, {
.compatible = "samsung,exynos850-chipid",
.data = &exynos850_chipid_drv_data,
},
{ }
};
MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);
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,
};
module_platform_driver(exynos_chipid_driver);
MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");
MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
MODULE_AUTHOR("Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>");
MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");
MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
MODULE_LICENSE("GPL");
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