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 { "EXYNOS8890", 0xE8890000 }, 61 /* Compatible with: samsung,exynos850-chipid */ 62 { "EXYNOS2200", 0xE9925000 }, 63 { "EXYNOS7885", 0xE7885000 }, 64 { "EXYNOS850", 0xE3830000 }, 65 { "EXYNOS8895", 0xE8895000 }, 66 { "EXYNOS9610", 0xE9610000 }, 67 { "EXYNOS9810", 0xE9810000 }, 68 { "EXYNOS990", 0xE9830000 }, 69 { "EXYNOSAUTOV9", 0xAAA80000 }, 70 { "EXYNOSAUTOV920", 0x0A920000 }, 71 }; 72 73 static const char *product_id_to_soc_id(unsigned int product_id) 74 { 75 int i; 76 77 for (i = 0; i < ARRAY_SIZE(soc_ids); i++) 78 if (product_id == soc_ids[i].id) 79 return soc_ids[i].name; 80 return NULL; 81 } 82 83 static int exynos_chipid_get_chipid_info(struct regmap *regmap, 84 const struct exynos_chipid_variant *data, 85 struct exynos_chipid_info *soc_info) 86 { 87 int ret; 88 unsigned int val, main_rev, sub_rev; 89 90 ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val); 91 if (ret < 0) 92 return ret; 93 soc_info->product_id = val & EXYNOS_MASK; 94 95 if (data->rev_reg != EXYNOS_CHIPID_REG_PRO_ID) { 96 ret = regmap_read(regmap, data->rev_reg, &val); 97 if (ret < 0) 98 return ret; 99 } 100 main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK; 101 sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK; 102 soc_info->revision = (main_rev << EXYNOS_REV_PART_SHIFT) | sub_rev; 103 104 return 0; 105 } 106 107 static int exynos_chipid_probe(struct platform_device *pdev) 108 { 109 const struct exynos_chipid_variant *drv_data; 110 struct exynos_chipid_info soc_info; 111 struct soc_device_attribute *soc_dev_attr; 112 struct device *dev = &pdev->dev; 113 struct soc_device *soc_dev; 114 struct device_node *root; 115 struct regmap *regmap; 116 int ret; 117 118 drv_data = of_device_get_match_data(dev); 119 if (!drv_data) 120 return -EINVAL; 121 122 regmap = device_node_to_regmap(dev->of_node); 123 if (IS_ERR(regmap)) 124 return PTR_ERR(regmap); 125 126 ret = exynos_chipid_get_chipid_info(regmap, drv_data, &soc_info); 127 if (ret < 0) 128 return ret; 129 130 soc_dev_attr = devm_kzalloc(dev, sizeof(*soc_dev_attr), GFP_KERNEL); 131 if (!soc_dev_attr) 132 return -ENOMEM; 133 134 soc_dev_attr->family = "Samsung Exynos"; 135 136 root = of_find_node_by_path("/"); 137 of_property_read_string(root, "model", &soc_dev_attr->machine); 138 of_node_put(root); 139 140 soc_dev_attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%x", 141 soc_info.revision); 142 if (!soc_dev_attr->revision) 143 return -ENOMEM; 144 soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id); 145 if (!soc_dev_attr->soc_id) { 146 pr_err("Unknown SoC\n"); 147 return -ENODEV; 148 } 149 150 /* please note that the actual registration will be deferred */ 151 soc_dev = soc_device_register(soc_dev_attr); 152 if (IS_ERR(soc_dev)) 153 return PTR_ERR(soc_dev); 154 155 ret = exynos_asv_init(dev, regmap); 156 if (ret) 157 goto err; 158 159 platform_set_drvdata(pdev, soc_dev); 160 161 dev_info(dev, "Exynos: CPU[%s] PRO_ID[0x%x] REV[0x%x] Detected\n", 162 soc_dev_attr->soc_id, soc_info.product_id, soc_info.revision); 163 164 return 0; 165 166 err: 167 soc_device_unregister(soc_dev); 168 169 return ret; 170 } 171 172 static void exynos_chipid_remove(struct platform_device *pdev) 173 { 174 struct soc_device *soc_dev = platform_get_drvdata(pdev); 175 176 soc_device_unregister(soc_dev); 177 } 178 179 static const struct exynos_chipid_variant exynos4210_chipid_drv_data = { 180 .rev_reg = 0x0, 181 .main_rev_shift = 4, 182 .sub_rev_shift = 0, 183 }; 184 185 static const struct exynos_chipid_variant exynos850_chipid_drv_data = { 186 .rev_reg = 0x10, 187 .main_rev_shift = 20, 188 .sub_rev_shift = 16, 189 }; 190 191 static const struct of_device_id exynos_chipid_of_device_ids[] = { 192 { 193 .compatible = "samsung,exynos4210-chipid", 194 .data = &exynos4210_chipid_drv_data, 195 }, { 196 .compatible = "samsung,exynos850-chipid", 197 .data = &exynos850_chipid_drv_data, 198 }, 199 { } 200 }; 201 MODULE_DEVICE_TABLE(of, exynos_chipid_of_device_ids); 202 203 static struct platform_driver exynos_chipid_driver = { 204 .driver = { 205 .name = "exynos-chipid", 206 .of_match_table = exynos_chipid_of_device_ids, 207 }, 208 .probe = exynos_chipid_probe, 209 .remove = exynos_chipid_remove, 210 }; 211 module_platform_driver(exynos_chipid_driver); 212 213 MODULE_DESCRIPTION("Samsung Exynos ChipID controller and ASV driver"); 214 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>"); 215 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>"); 216 MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>"); 217 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>"); 218 MODULE_LICENSE("GPL"); 219