1 // SPDX-License-Identifier: GPL-2.0 2 /* 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 support 8 * 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 support 13 */ 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 28 struct 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 34 struct exynos_chipid_info { 35 u32 product_id; 36 u32 revision; 37 }; 38 39 static 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 }; 63 64 static const char *product_id_to_soc_id(unsigned int product_id) 65 { 66 int i; 67 68 for (i = 0; i < ARRAY_SIZE(soc_ids); i++) 69 if (product_id == soc_ids[i].id) 70 return soc_ids[i].name; 71 return NULL; 72 } 73 74 static int exynos_chipid_get_chipid_info(struct regmap *regmap, 75 const struct exynos_chipid_variant *data, 76 struct exynos_chipid_info *soc_info) 77 { 78 int ret; 79 unsigned int val, main_rev, sub_rev; 80 81 ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val); 82 if (ret < 0) 83 return ret; 84 soc_info->product_id = val & EXYNOS_MASK; 85 86 if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) { 87 ret = regmap_read(regmap, data->rev_reg, &val); 88 if (ret < 0) 89 return ret; 90 } 91 main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK; 92 sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK; 93 soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev; 94 95 return 0; 96 } 97 98 static int exynos_chipid_probe(struct platform_device *pdev) 99 { 100 const struct exynos_chipid_variant *drv_data; 101 struct exynos_chipid_info soc_info; 102 struct soc_device_attribute *soc_dev_attr; 103 struct soc_device *soc_dev; 104 struct device_node *root; 105 struct regmap *regmap; 106 int ret; 107 108 drv_data = of_device_get_match_data(&pdev->dev); 109 if (!drv_data) 110 return -EINVAL; 111 112 regmap = device_node_to_regmap(pdev->dev.of_node); 113 if (IS_ERR(regmap)) 114 return PTR_ERR(regmap); 115 116 ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info); 117 if (ret < 0) 118 return ret; 119 120 soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr), 121 GFP_KERNEL); 122 if (!soc_dev_attr) 123 return -ENOMEM; 124 125 soc_dev_attr->family = "Samsung Exynos"; 126 127 root = of_find_node_by_path("/"); 128 of_property_read_string(root, "model", &soc_dev_attr->machine); 129 of_node_put(root); 130 131 soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL, 132 "%x", soc_info.revision); 133 soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id); 134 if (!soc_dev_attr->soc_id) { 135 pr_err("Unknown SoC\n"); 136 return -ENODEV; 137 } 138 139 /* please note that the actual registration will be deferred */ 140 soc_dev = soc_device_register(soc_dev_attr); 141 if (IS_ERR(soc_dev)) 142 return PTR_ERR(soc_dev); 143 144 ret = exynos_asv_init(&pdev->dev, regmap); 145 if (ret) 146 goto err; 147 148 platform_set_drvdata(pdev, soc_dev); 149 150 dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n", 151 soc_dev_attr->soc_id, soc_info.product_id, soc_info.revision); 152 153 return 0; 154 155 err: 156 soc_device_unregister(soc_dev); 157 158 return ret; 159 } 160 161 static int exynos_chipid_remove(struct platform_device *pdev) 162 { 163 struct soc_device *soc_dev = platform_get_drvdata(pdev); 164 165 soc_device_unregister(soc_dev); 166 167 return 0; 168 } 169 170 static const struct exynos_chipid_variant exynos4210_chipid_drv_data = { 171 .rev_reg = 0x0, 172 .main_rev_shift = 4, 173 .sub_rev_shift = 0, 174 }; 175 176 static const struct exynos_chipid_variant exynos850_chipid_drv_data = { 177 .rev_reg = 0x10, 178 .main_rev_shift = 20, 179 .sub_rev_shift = 16, 180 }; 181 182 static const struct of_device_id exynos_chipid_of_device_ids[] = { 183 { 184 .compatible = "samsung,exynos4210-chipid", 185 .data = &exynos4210_chipid_drv_data, 186 }, { 187 .compatible = "samsung,exynos850-chipid", 188 .data = &exynos850_chipid_drv_data, 189 }, 190 { } 191 }; 192 MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids); 193 194 static struct platform_driver exynos_chipid_driver = { 195 .driver = { 196 .name = "exynos-chipid", 197 .of_match_table = exynos_chipid_of_device_ids, 198 }, 199 .probe = exynos_chipid_probe, 200 .remove = exynos_chipid_remove, 201 }; 202 module_platform_driver(exynos_chipid_driver); 203 204 MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver"); 205 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>"); 206 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>"); 207 MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>"); 208 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>"); 209 MODULE_LICENSE("GPL"); 210