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/of_device.h> 21 #include <linux/platform_device.h> 22 #include <linux/regmap.h> 23 #include <linux/slab.h> 24 #include <linux/soc/samsung/exynos-chipid.h> 25 #include <linux/sys_soc.h> 26 27 #include "exynos-asv.h" 28 29 struct exynos_chipid_variant { 30 unsigned int rev_reg; /* revision register offset */ 31 unsigned int main_rev_shift; /* main revision offset in rev_reg */ 32 unsigned int sub_rev_shift; /* sub revision offset in rev_reg */ 33 }; 34 35 struct exynos_chipid_info { 36 u32 product_id; 37 u32 revision; 38 }; 39 40 static const struct exynos_soc_id { 41 const char *name; 42 unsigned int id; 43 } soc_ids[] = { 44 /* List ordered by SoC name */ 45 /* Compatible with: samsung,exynos4210-chipid */ 46 { "EXYNOS3250", 0xE3472000 }, 47 { "EXYNOS4210", 0x43200000 }, /* EVT0 revision */ 48 { "EXYNOS4210", 0x43210000 }, 49 { "EXYNOS4212", 0x43220000 }, 50 { "EXYNOS4412", 0xE4412000 }, 51 { "EXYNOS5250", 0x43520000 }, 52 { "EXYNOS5260", 0xE5260000 }, 53 { "EXYNOS5410", 0xE5410000 }, 54 { "EXYNOS5420", 0xE5420000 }, 55 { "EXYNOS5433", 0xE5433000 }, 56 { "EXYNOS5440", 0xE5440000 }, 57 { "EXYNOS5800", 0xE5422000 }, 58 { "EXYNOS7420", 0xE7420000 }, 59 /* Compatible with: samsung,exynos850-chipid */ 60 { "EXYNOS7885", 0xE7885000 }, 61 { "EXYNOS850", 0xE3830000 }, 62 { "EXYNOSAUTOV9", 0xAAA80000 }, 63 }; 64 65 static 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 75 static 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 99 static 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; 155 156 err: 157 soc_device_unregister(soc_dev); 158 159 return ret; 160 } 161 162 static int 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 return 0; 169 } 170 171 static const struct exynos_chipid_variant exynos4210_chipid_drv_data = { 172 .rev_reg = 0x0, 173 .main_rev_shift = 4, 174 .sub_rev_shift = 0, 175 }; 176 177 static const struct exynos_chipid_variant exynos850_chipid_drv_data = { 178 .rev_reg = 0x10, 179 .main_rev_shift = 20, 180 .sub_rev_shift = 16, 181 }; 182 183 static const struct of_device_id exynos_chipid_of_device_ids[] = { 184 { 185 .compatible = "samsung,exynos4210-chipid", 186 .data = &exynos4210_chipid_drv_data, 187 }, { 188 .compatible = "samsung,exynos850-chipid", 189 .data = &exynos850_chipid_drv_data, 190 }, 191 { } 192 }; 193 MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids); 194 195 static struct platform_driver exynos_chipid_driver = { 196 .driver = { 197 .name = "exynos-chipid", 198 .of_match_table = exynos_chipid_of_device_ids, 199 }, 200 .probe = exynos_chipid_probe, 201 .remove = exynos_chipid_remove, 202 }; 203 module_platform_driver(exynos_chipid_driver); 204 205 MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver"); 206 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>"); 207 MODULE_AUTHOR("Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>"); 208 MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>"); 209 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>"); 210 MODULE_LICENSE("GPL"); 211