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/array_size.h> 16 #include <linux/device.h> 17 #include <linux/errno.h> 18 #include <linux/mfd/syscon.h> 19 #include <linux/module.h> 20 #include <linux/of.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 { "EXYNOS7870", 0xE7870000 }, 60 /* Compatible with: samsung,exynos850-chipid */ 61 { "EXYNOS2200", 0xE9925000 }, 62 { "EXYNOS7885", 0xE7885000 }, 63 { "EXYNOS850", 0xE3830000 }, 64 { "EXYNOS8895", 0xE8895000 }, 65 { "EXYNOS9810", 0xE9810000 }, 66 { "EXYNOS990", 0xE9830000 }, 67 { "EXYNOSAUTOV9", 0xAAA80000 }, 68 { "EXYNOSAUTOV920", 0x0A920000 }, 69 }; 70 71 static const char *product_id_to_soc_id(unsigned int product_id) 72 { 73 int i; 74 75 for (i = 0; i < ARRAY_SIZE(soc_ids); i++) 76 if (product_id == soc_ids[i].id) 77 return soc_ids[i].name; 78 return NULL; 79 } 80 81 static int exynos_chipid_get_chipid_info(struct regmap *regmap, 82 const struct exynos_chipid_variant *data, 83 struct exynos_chipid_info *soc_info) 84 { 85 int ret; 86 unsigned int val, main_rev, sub_rev; 87 88 ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val); 89 if (ret < 0) 90 return ret; 91 soc_info->product_id = val & EXYNOS_MASK; 92 93 if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) { 94 ret = regmap_read(regmap, data->rev_reg, &val); 95 if (ret < 0) 96 return ret; 97 } 98 main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK; 99 sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK; 100 soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev; 101 102 return 0; 103 } 104 105 static int exynos_chipid_probe(struct platform_device *pdev) 106 { 107 const struct exynos_chipid_variant *drv_data; 108 struct exynos_chipid_info soc_info; 109 struct soc_device_attribute *soc_dev_attr; 110 struct soc_device *soc_dev; 111 struct device_node *root; 112 struct regmap *regmap; 113 int ret; 114 115 drv_data = of_device_get_match_data(&pdev->dev); 116 if (!drv_data) 117 return -EINVAL; 118 119 regmap = device_node_to_regmap(pdev->dev.of_node); 120 if (IS_ERR(regmap)) 121 return PTR_ERR(regmap); 122 123 ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info); 124 if (ret < 0) 125 return ret; 126 127 soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr), 128 GFP_KERNEL); 129 if (!soc_dev_attr) 130 return -ENOMEM; 131 132 soc_dev_attr->family = "Samsung Exynos"; 133 134 root = of_find_node_by_path("/"); 135 of_property_read_string(root, "model", &soc_dev_attr->machine); 136 of_node_put(root); 137 138 soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL, 139 "%x", soc_info.revision); 140 if (!soc_dev_attr->revision) 141 return -ENOMEM; 142 soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id); 143 if (!soc_dev_attr->soc_id) { 144 pr_err("Unknown SoC\n"); 145 return -ENODEV; 146 } 147 148 /* please note that the actual registration will be deferred */ 149 soc_dev = soc_device_register(soc_dev_attr); 150 if (IS_ERR(soc_dev)) 151 return PTR_ERR(soc_dev); 152 153 ret = exynos_asv_init(&pdev->dev, regmap); 154 if (ret) 155 goto err; 156 157 platform_set_drvdata(pdev, soc_dev); 158 159 dev_info(&pdev->dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n", 160 soc_dev_attr->soc_id, soc_info.product_id, soc_info.revision); 161 162 return 0; 163 164 err: 165 soc_device_unregister(soc_dev); 166 167 return ret; 168 } 169 170 static void exynos_chipid_remove(struct platform_device *pdev) 171 { 172 struct soc_device *soc_dev = platform_get_drvdata(pdev); 173 174 soc_device_unregister(soc_dev); 175 } 176 177 static const struct exynos_chipid_variant exynos4210_chipid_drv_data = { 178 .rev_reg = 0x0, 179 .main_rev_shift = 4, 180 .sub_rev_shift = 0, 181 }; 182 183 static const struct exynos_chipid_variant exynos850_chipid_drv_data = { 184 .rev_reg = 0x10, 185 .main_rev_shift = 20, 186 .sub_rev_shift = 16, 187 }; 188 189 static const struct of_device_id exynos_chipid_of_device_ids[] = { 190 { 191 .compatible = "samsung,exynos4210-chipid", 192 .data = &exynos4210_chipid_drv_data, 193 }, { 194 .compatible = "samsung,exynos850-chipid", 195 .data = &exynos850_chipid_drv_data, 196 }, 197 { } 198 }; 199 MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids); 200 201 static struct platform_driver exynos_chipid_driver = { 202 .driver = { 203 .name = "exynos-chipid", 204 .of_match_table = exynos_chipid_of_device_ids, 205 }, 206 .probe = exynos_chipid_probe, 207 .remove = exynos_chipid_remove, 208 }; 209 module_platform_driver(exynos_chipid_driver); 210 211 MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver"); 212 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>"); 213 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>"); 214 MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>"); 215 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>"); 216 MODULE_LICENSE("GPL"); 217