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![Krzysztof Kozlowski](/assets/img/avatar_default.png)
Use Krzysztof Kozlowski's @kernel.org account in maintainer entries. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20220307172805.156760-1-krzysztof.kozlowski@canonical.com' Signed-off-by: Arnd Bergmann <arnd@arndb.de>
210 lines
5.5 KiB
C
210 lines
5.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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* Copyright (c) 2020 Krzysztof Kozlowski <krzk@kernel.org>
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*
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* Exynos - CHIP ID support
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* Author: Pankaj Dubey <pankaj.dubey@samsung.com>
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* Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
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* Author: Krzysztof Kozlowski <krzk@kernel.org>
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*
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* Samsung Exynos SoC Adaptive Supply Voltage and Chip ID support
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*/
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/soc/samsung/exynos-chipid.h>
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#include <linux/sys_soc.h>
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#include "exynos-asv.h"
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struct exynos_chipid_variant {
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unsigned int rev_reg; /* revision register offset */
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unsigned int main_rev_shift; /* main revision offset in rev_reg */
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unsigned int sub_rev_shift; /* sub revision offset in rev_reg */
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};
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struct exynos_chipid_info {
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u32 product_id;
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u32 revision;
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};
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static const struct exynos_soc_id {
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const char *name;
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unsigned int id;
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} soc_ids[] = {
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/* List ordered by SoC name */
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/* Compatible with: samsung,exynos4210-chipid */
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{ "EXYNOS3250", 0xE3472000 },
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{ "EXYNOS4210", 0x43200000 }, /* EVT0 revision */
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{ "EXYNOS4210", 0x43210000 },
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{ "EXYNOS4212", 0x43220000 },
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{ "EXYNOS4412", 0xE4412000 },
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{ "EXYNOS5250", 0x43520000 },
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{ "EXYNOS5260", 0xE5260000 },
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{ "EXYNOS5410", 0xE5410000 },
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{ "EXYNOS5420", 0xE5420000 },
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{ "EXYNOS5433", 0xE5433000 },
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{ "EXYNOS5440", 0xE5440000 },
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{ "EXYNOS5800", 0xE5422000 },
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{ "EXYNOS7420", 0xE7420000 },
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/* Compatible with: samsung,exynos850-chipid */
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{ "EXYNOS7885", 0xE7885000 },
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{ "EXYNOS850", 0xE3830000 },
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{ "EXYNOSAUTOV9", 0xAAA80000 },
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};
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static const char *product_id_to_soc_id(unsigned int product_id)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
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if (product_id == soc_ids[i].id)
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return soc_ids[i].name;
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return NULL;
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}
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static int exynos_chipid_get_chipid_info(struct regmap *regmap,
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const struct exynos_chipid_variant *data,
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struct exynos_chipid_info *soc_info)
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{
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int ret;
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unsigned int val, main_rev, sub_rev;
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ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val);
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if (ret < 0)
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return ret;
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soc_info->product_id = val & EXYNOS_MASK;
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if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) {
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ret = regmap_read(regmap, data->rev_reg, &val);
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if (ret < 0)
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return ret;
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}
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main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
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sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;
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soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev;
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return 0;
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}
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static int exynos_chipid_probe(struct platform_device *pdev)
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{
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const struct exynos_chipid_variant *drv_data;
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struct exynos_chipid_info soc_info;
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struct soc_device_attribute *soc_dev_attr;
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struct soc_device *soc_dev;
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struct device_node *root;
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struct regmap *regmap;
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int ret;
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drv_data = of_device_get_match_data(&pdev->dev);
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if (!drv_data)
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return -EINVAL;
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regmap = device_node_to_regmap(pdev->dev.of_node);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info);
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if (ret < 0)
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return ret;
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soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
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GFP_KERNEL);
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if (!soc_dev_attr)
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return -ENOMEM;
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soc_dev_attr->family = "Samsung Exynos";
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root = of_find_node_by_path("/");
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of_property_read_string(root, "model", &soc_dev_attr->machine);
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of_node_put(root);
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soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL,
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"%x", soc_info.revision);
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soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id);
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if (!soc_dev_attr->soc_id) {
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pr_err("Unknown SoC\n");
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return -ENODEV;
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}
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/* please note that the actual registration will be deferred */
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR(soc_dev))
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return PTR_ERR(soc_dev);
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ret = exynos_asv_init(&pdev->dev, regmap);
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if (ret)
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goto err;
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platform_set_drvdata(pdev, soc_dev);
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dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",
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soc_dev_attr->soc_id, soc_info.product_id, soc_info.revision);
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return 0;
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err:
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soc_device_unregister(soc_dev);
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return ret;
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}
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static int exynos_chipid_remove(struct platform_device *pdev)
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{
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struct soc_device *soc_dev = platform_get_drvdata(pdev);
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soc_device_unregister(soc_dev);
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return 0;
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}
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static const struct exynos_chipid_variant exynos4210_chipid_drv_data = {
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.rev_reg = 0x0,
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.main_rev_shift = 4,
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.sub_rev_shift = 0,
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};
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static const struct exynos_chipid_variant exynos850_chipid_drv_data = {
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.rev_reg = 0x10,
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.main_rev_shift = 20,
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.sub_rev_shift = 16,
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};
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static const struct of_device_id exynos_chipid_of_device_ids[] = {
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{
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.compatible = "samsung,exynos4210-chipid",
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.data = &exynos4210_chipid_drv_data,
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}, {
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.compatible = "samsung,exynos850-chipid",
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.data = &exynos850_chipid_drv_data,
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},
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{ }
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};
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MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);
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static struct platform_driver exynos_chipid_driver = {
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.driver = {
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.name = "exynos-chipid",
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.of_match_table = exynos_chipid_of_device_ids,
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},
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.probe = exynos_chipid_probe,
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.remove = exynos_chipid_remove,
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};
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module_platform_driver(exynos_chipid_driver);
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MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");
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MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
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MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
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MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");
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MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
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MODULE_LICENSE("GPL");
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