1e3e559f8d
Exynos ChipID and ASV (Adaptive Supply Voltage) driver is not essential to system boot and it can successfully be built and loaded as module. This makes core kernel image smaller and reduces the memory footprint when multi-platform kernel is booted on non-Exynos board. Usually it is also distro-friendly. Add multiple authors of the driver since its conversion from mach-exynos, ordered alphabetically by first name. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Reviewed-by: Sylwester Nawrocki <snawrocki@kernel.org> Tested-by: Sylwester Nawrocki <snawrocki@kernel.org> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com> Tested-by: Alim Akhtar <alim.akhtar@samsung.com> Link: https://lore.kernel.org/r/20210919093114.35987-3-krzysztof.kozlowski@canonical.com
150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
// 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/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(&pdev->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" },
|
|
{}
|
|
};
|
|
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");
|