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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (c) 2019 Samsung Electronics Co., Ltd.4 * http://www.samsung.com/5 * Copyright (c) 2020 Krzysztof Kozlowski <krzk@kernel.org>6 *7 * Exynos - CHIP ID support8 * Author: Pankaj Dubey <pankaj.dubey@samsung.com>9 * Author: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>10 * Author: Krzysztof Kozlowski <krzk@kernel.org>11 *12 * Samsung Exynos SoC Adaptive Supply Voltage and Chip ID support13 */14 15#include <linux/device.h>16#include <linux/errno.h>17#include <linux/mfd/syscon.h>18#include <linux/module.h>19#include <linux/of.h>20#include <linux/platform_device.h>21#include <linux/regmap.h>22#include <linux/slab.h>23#include <linux/soc/samsung/exynos-chipid.h>24#include <linux/sys_soc.h>25 26#include "exynos-asv.h"27 28struct exynos_chipid_variant {29 unsigned int rev_reg; /* revision register offset */30 unsigned int main_rev_shift; /* main revision offset in rev_reg */31 unsigned int sub_rev_shift; /* sub revision offset in rev_reg */32};33 34struct exynos_chipid_info {35 u32 product_id;36 u32 revision;37};38 39static const struct exynos_soc_id {40 const char *name;41 unsigned int id;42} soc_ids[] = {43 /* List ordered by SoC name */44 /* Compatible with: samsung,exynos4210-chipid */45 { "EXYNOS3250", 0xE3472000 },46 { "EXYNOS4210", 0x43200000 }, /* EVT0 revision */47 { "EXYNOS4210", 0x43210000 },48 { "EXYNOS4212", 0x43220000 },49 { "EXYNOS4412", 0xE4412000 },50 { "EXYNOS5250", 0x43520000 },51 { "EXYNOS5260", 0xE5260000 },52 { "EXYNOS5410", 0xE5410000 },53 { "EXYNOS5420", 0xE5420000 },54 { "EXYNOS5433", 0xE5433000 },55 { "EXYNOS5440", 0xE5440000 },56 { "EXYNOS5800", 0xE5422000 },57 { "EXYNOS7420", 0xE7420000 },58 /* Compatible with: samsung,exynos850-chipid */59 { "EXYNOS7885", 0xE7885000 },60 { "EXYNOS850", 0xE3830000 },61 { "EXYNOSAUTOV9", 0xAAA80000 },62 { "EXYNOSAUTOV920", 0x0A920000 },63};64 65static const char *product_id_to_soc_id(unsigned int product_id)66{67 int i;68 69 for (i = 0; i < ARRAY_SIZE(soc_ids); i++)70 if (product_id == soc_ids[i].id)71 return soc_ids[i].name;72 return NULL;73}74 75static int exynos_chipid_get_chipid_info(struct regmap *regmap,76 const struct exynos_chipid_variant *data,77 struct exynos_chipid_info *soc_info)78{79 int ret;80 unsigned int val, main_rev, sub_rev;81 82 ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val);83 if (ret < 0)84 return ret;85 soc_info->product_id = val & EXYNOS_MASK;86 87 if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) {88 ret = regmap_read(regmap, data->rev_reg, &val);89 if (ret < 0)90 return ret;91 }92 main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;93 sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;94 soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev;95 96 return 0;97}98 99static int exynos_chipid_probe(struct platform_device *pdev)100{101 const struct exynos_chipid_variant *drv_data;102 struct exynos_chipid_info soc_info;103 struct soc_device_attribute *soc_dev_attr;104 struct soc_device *soc_dev;105 struct device_node *root;106 struct regmap *regmap;107 int ret;108 109 drv_data = of_device_get_match_data(&pdev->dev);110 if (!drv_data)111 return -EINVAL;112 113 regmap = device_node_to_regmap(pdev->dev.of_node);114 if (IS_ERR(regmap))115 return PTR_ERR(regmap);116 117 ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info);118 if (ret < 0)119 return ret;120 121 soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),122 GFP_KERNEL);123 if (!soc_dev_attr)124 return -ENOMEM;125 126 soc_dev_attr->family = "Samsung Exynos";127 128 root = of_find_node_by_path("/");129 of_property_read_string(root, "model", &soc_dev_attr->machine);130 of_node_put(root);131 132 soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL,133 "%x", soc_info.revision);134 soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id);135 if (!soc_dev_attr->soc_id) {136 pr_err("Unknown SoC\n");137 return -ENODEV;138 }139 140 /* please note that the actual registration will be deferred */141 soc_dev = soc_device_register(soc_dev_attr);142 if (IS_ERR(soc_dev))143 return PTR_ERR(soc_dev);144 145 ret = exynos_asv_init(&pdev->dev, regmap);146 if (ret)147 goto err;148 149 platform_set_drvdata(pdev, soc_dev);150 151 dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n",152 soc_dev_attr->soc_id, soc_info.product_id, soc_info.revision);153 154 return 0;155 156err:157 soc_device_unregister(soc_dev);158 159 return ret;160}161 162static void exynos_chipid_remove(struct platform_device *pdev)163{164 struct soc_device *soc_dev = platform_get_drvdata(pdev);165 166 soc_device_unregister(soc_dev);167}168 169static const struct exynos_chipid_variant exynos4210_chipid_drv_data = {170 .rev_reg = 0x0,171 .main_rev_shift = 4,172 .sub_rev_shift = 0,173};174 175static const struct exynos_chipid_variant exynos850_chipid_drv_data = {176 .rev_reg = 0x10,177 .main_rev_shift = 20,178 .sub_rev_shift = 16,179};180 181static const struct of_device_id exynos_chipid_of_device_ids[] = {182 {183 .compatible = "samsung,exynos4210-chipid",184 .data = &exynos4210_chipid_drv_data,185 }, {186 .compatible = "samsung,exynos850-chipid",187 .data = &exynos850_chipid_drv_data,188 },189 { }190};191MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids);192 193static struct platform_driver exynos_chipid_driver = {194 .driver = {195 .name = "exynos-chipid",196 .of_match_table = exynos_chipid_of_device_ids,197 },198 .probe = exynos_chipid_probe,199 .remove_new = exynos_chipid_remove,200};201module_platform_driver(exynos_chipid_driver);202 203MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver");204MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");205MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");206MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");207MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");208MODULE_LICENSE("GPL");209