1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2023 MediaTek Inc. 4 */ 5 #include <linux/kernel.h> 6 #include <linux/module.h> 7 #include <linux/of.h> 8 #include <linux/of_platform.h> 9 #include <linux/pm_runtime.h> 10 #include <linux/nvmem-consumer.h> 11 #include <linux/device.h> 12 #include <linux/device/bus.h> 13 #include <linux/debugfs.h> 14 #include <linux/seq_file.h> 15 #include <linux/string.h> 16 #include <linux/sys_soc.h> 17 #include <linux/slab.h> 18 #include <linux/platform_device.h> 19 20 #define MTK_SOCINFO_ENTRY(_soc_name, _segment_name, _marketing_name, _cell_data1, _cell_data2) {\ 21 .soc_name = _soc_name, \ 22 .segment_name = _segment_name, \ 23 .marketing_name = _marketing_name, \ 24 .cell_data = {_cell_data1, _cell_data2} \ 25 } 26 #define CELL_NOT_USED (0xFFFFFFFF) 27 #define MAX_CELLS (2) 28 29 struct mtk_socinfo { 30 struct device *dev; 31 struct name_data *name_data; 32 struct socinfo_data *socinfo_data; 33 struct soc_device *soc_dev; 34 }; 35 36 struct socinfo_data { 37 char *soc_name; 38 char *segment_name; 39 char *marketing_name; 40 u32 cell_data[MAX_CELLS]; 41 }; 42 43 static const char *cell_names[MAX_CELLS] = {"socinfo-data1", "socinfo-data2"}; 44 45 static struct socinfo_data socinfo_data_table[] = { 46 MTK_SOCINFO_ENTRY("MT8173", "MT8173V/AC", "MT8173", 0x6CA20004, 0x10000000), 47 MTK_SOCINFO_ENTRY("MT8183", "MT8183V/AZA", "Kompanio 500", 0x00010043, 0x00000840), 48 MTK_SOCINFO_ENTRY("MT8183", "MT8183V/AZA", "Kompanio 500", 0x00010043, 0x00000940), 49 MTK_SOCINFO_ENTRY("MT8186", "MT8186GV/AZA", "Kompanio 520", 0x81861001, CELL_NOT_USED), 50 MTK_SOCINFO_ENTRY("MT8186T", "MT8186TV/AZA", "Kompanio 528", 0x81862001, CELL_NOT_USED), 51 MTK_SOCINFO_ENTRY("MT8188", "MT8188GV/AZA", "Kompanio 830", 0x81880000, 0x00000010), 52 MTK_SOCINFO_ENTRY("MT8188", "MT8188GV/HZA", "Kompanio 830", 0x81880000, 0x00000011), 53 MTK_SOCINFO_ENTRY("MT8192", "MT8192V/AZA", "Kompanio 820", 0x00001100, 0x00040080), 54 MTK_SOCINFO_ENTRY("MT8192T", "MT8192V/ATZA", "Kompanio 828", 0x00000100, 0x000400C0), 55 MTK_SOCINFO_ENTRY("MT8195", "MT8195GV/EZA", "Kompanio 1200", 0x81950300, CELL_NOT_USED), 56 MTK_SOCINFO_ENTRY("MT8195", "MT8195GV/EHZA", "Kompanio 1200", 0x81950304, CELL_NOT_USED), 57 MTK_SOCINFO_ENTRY("MT8195", "MT8195TV/EZA", "Kompanio 1380", 0x81950400, CELL_NOT_USED), 58 MTK_SOCINFO_ENTRY("MT8195", "MT8195TV/EHZA", "Kompanio 1380", 0x81950404, CELL_NOT_USED), 59 }; 60 61 static int mtk_socinfo_create_socinfo_node(struct mtk_socinfo *mtk_socinfop) 62 { 63 struct soc_device_attribute *attrs; 64 static char machine[30] = {0}; 65 static const char *soc_manufacturer = "MediaTek"; 66 67 attrs = devm_kzalloc(mtk_socinfop->dev, sizeof(*attrs), GFP_KERNEL); 68 if (!attrs) 69 return -ENOMEM; 70 71 snprintf(machine, sizeof(machine), "%s (%s)", mtk_socinfop->socinfo_data->marketing_name, 72 mtk_socinfop->socinfo_data->soc_name); 73 attrs->family = soc_manufacturer; 74 attrs->machine = machine; 75 76 mtk_socinfop->soc_dev = soc_device_register(attrs); 77 if (IS_ERR(mtk_socinfop->soc_dev)) 78 return PTR_ERR(mtk_socinfop->soc_dev); 79 80 dev_info(mtk_socinfop->dev, "%s %s SoC detected.\n", soc_manufacturer, attrs->machine); 81 return 0; 82 } 83 84 static u32 mtk_socinfo_read_cell(struct device *dev, const char *name) 85 { 86 struct nvmem_device *nvmemp; 87 struct device_node *np, *nvmem_node = dev->parent->of_node; 88 u32 offset; 89 u32 cell_val = CELL_NOT_USED; 90 91 /* should never fail since the nvmem driver registers this child */ 92 nvmemp = nvmem_device_find(nvmem_node, device_match_of_node); 93 if (IS_ERR(nvmemp)) 94 goto out; 95 96 np = of_get_child_by_name(nvmem_node, name); 97 if (!np) 98 goto put_device; 99 100 if (of_property_read_u32_index(np, "reg", 0, &offset)) 101 goto put_node; 102 103 nvmem_device_read(nvmemp, offset, sizeof(cell_val), &cell_val); 104 105 put_node: 106 of_node_put(np); 107 put_device: 108 nvmem_device_put(nvmemp); 109 out: 110 return cell_val; 111 } 112 113 static int mtk_socinfo_get_socinfo_data(struct mtk_socinfo *mtk_socinfop) 114 { 115 unsigned int i, j; 116 unsigned int num_cell_data = 0; 117 u32 cell_data[MAX_CELLS] = {0}; 118 bool match_socinfo; 119 int match_socinfo_index = -1; 120 121 for (i = 0; i < MAX_CELLS; i++) { 122 cell_data[i] = mtk_socinfo_read_cell(mtk_socinfop->dev, cell_names[i]); 123 if (cell_data[i] != CELL_NOT_USED) 124 num_cell_data++; 125 else 126 break; 127 } 128 129 if (!num_cell_data) 130 return -ENOENT; 131 132 for (i = 0; i < ARRAY_SIZE(socinfo_data_table); i++) { 133 match_socinfo = true; 134 for (j = 0; j < num_cell_data; j++) { 135 if (cell_data[j] != socinfo_data_table[i].cell_data[j]) { 136 match_socinfo = false; 137 break; 138 } 139 } 140 if (match_socinfo) { 141 mtk_socinfop->socinfo_data = &(socinfo_data_table[i]); 142 match_socinfo_index = i; 143 break; 144 } 145 } 146 147 return match_socinfo_index >= 0 ? match_socinfo_index : -ENOENT; 148 } 149 150 static int mtk_socinfo_probe(struct platform_device *pdev) 151 { 152 struct mtk_socinfo *mtk_socinfop; 153 int ret; 154 155 mtk_socinfop = devm_kzalloc(&pdev->dev, sizeof(*mtk_socinfop), GFP_KERNEL); 156 if (!mtk_socinfop) 157 return -ENOMEM; 158 159 mtk_socinfop->dev = &pdev->dev; 160 161 ret = mtk_socinfo_get_socinfo_data(mtk_socinfop); 162 if (ret < 0) 163 return dev_err_probe(mtk_socinfop->dev, ret, "Failed to get socinfo data\n"); 164 165 ret = mtk_socinfo_create_socinfo_node(mtk_socinfop); 166 if (ret) 167 return dev_err_probe(mtk_socinfop->dev, ret, "Cannot create node\n"); 168 169 platform_set_drvdata(pdev, mtk_socinfop); 170 return 0; 171 } 172 173 static void mtk_socinfo_remove(struct platform_device *pdev) 174 { 175 struct mtk_socinfo *mtk_socinfop = platform_get_drvdata(pdev); 176 177 soc_device_unregister(mtk_socinfop->soc_dev); 178 } 179 180 static struct platform_driver mtk_socinfo = { 181 .probe = mtk_socinfo_probe, 182 .remove_new = mtk_socinfo_remove, 183 .driver = { 184 .name = "mtk-socinfo", 185 }, 186 }; 187 module_platform_driver(mtk_socinfo); 188 189 MODULE_AUTHOR("William-TW LIN <william-tw.lin@mediatek.com>"); 190 MODULE_DESCRIPTION("MediaTek socinfo driver"); 191 MODULE_LICENSE("GPL"); 192