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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | // SPDX-License-Identifier: GPL-2.0+ /* * Author: Yinbo Zhu <zhuyinbo@loongson.cn> * Copyright (C) 2022-2023 Loongson Technology Corporation Limited */ #include <linux/io.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/of_fdt.h> #include <linux/sys_soc.h> #include <linux/of_address.h> #include <linux/platform_device.h> static struct soc_device_attribute soc_dev_attr; static struct soc_device *soc_dev; /* * Global Utility Registers. * * Not all registers defined in this structure are available on all chips, so * you are expected to know whether a given register actually exists on your * chip before you access it. * * Also, some registers are similar on different chips but have slightly * different names. In these cases, one name is chosen to avoid extraneous * #ifdefs. */ struct scfg_guts { u32 svr; /* Version Register */ u8 res0[4]; u16 feature; /* Feature Register */ u32 vendor; /* Vendor Register */ u8 res1[6]; u32 id; u8 res2[0x3ff8 - 0x18]; u32 chip; }; static struct guts { struct scfg_guts __iomem *regs; bool little_endian; } *guts; struct loongson2_soc_die_attr { char *die; u32 svr; u32 mask; }; /* SoC die attribute definition for Loongson-2 platform */ static const struct loongson2_soc_die_attr loongson2_soc_die[] = { /* * LoongArch-based SoCs Loongson-2 Series */ /* Die: 2k1000, SoC: 2k1000 */ { .die = "2K1000", .svr = 0x00000013, .mask = 0x000000ff, }, { }, }; static const struct loongson2_soc_die_attr *loongson2_soc_die_match( u32 svr, const struct loongson2_soc_die_attr *matches) { while (matches->svr) { if (matches->svr == (svr & matches->mask)) return matches; matches++; } return NULL; } static u32 loongson2_guts_get_svr(void) { u32 svr = 0; if (!guts || !guts->regs) return svr; if (guts->little_endian) svr = ioread32(&guts->regs->svr); else svr = ioread32be(&guts->regs->svr); return svr; } static int loongson2_guts_probe(struct platform_device *pdev) { struct device_node *root, *np = pdev->dev.of_node; struct device *dev = &pdev->dev; const struct loongson2_soc_die_attr *soc_die; const char *machine; u32 svr; /* Initialize guts */ guts = devm_kzalloc(dev, sizeof(*guts), GFP_KERNEL); if (!guts) return -ENOMEM; guts->little_endian = of_property_read_bool(np, "little-endian"); guts->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(guts->regs)) return PTR_ERR(guts->regs); /* Register soc device */ root = of_find_node_by_path("/"); if (of_property_read_string(root, "model", &machine)) of_property_read_string_index(root, "compatible", 0, &machine); of_node_put(root); if (machine) soc_dev_attr.machine = devm_kstrdup(dev, machine, GFP_KERNEL); svr = loongson2_guts_get_svr(); soc_die = loongson2_soc_die_match(svr, loongson2_soc_die); if (soc_die) { soc_dev_attr.family = devm_kasprintf(dev, GFP_KERNEL, "Loongson %s", soc_die->die); } else { soc_dev_attr.family = devm_kasprintf(dev, GFP_KERNEL, "Loongson"); } if (!soc_dev_attr.family) return -ENOMEM; soc_dev_attr.soc_id = devm_kasprintf(dev, GFP_KERNEL, "svr:0x%08x", svr); if (!soc_dev_attr.soc_id) return -ENOMEM; soc_dev_attr.revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d", (svr >> 4) & 0xf, svr & 0xf); if (!soc_dev_attr.revision) return -ENOMEM; soc_dev = soc_device_register(&soc_dev_attr); if (IS_ERR(soc_dev)) return PTR_ERR(soc_dev); pr_info("Machine: %s\n", soc_dev_attr.machine); pr_info("SoC family: %s\n", soc_dev_attr.family); pr_info("SoC ID: %s, Revision: %s\n", soc_dev_attr.soc_id, soc_dev_attr.revision); return 0; } static void loongson2_guts_remove(struct platform_device *dev) { soc_device_unregister(soc_dev); } /* * Table for matching compatible strings, for device tree * guts node, for Loongson-2 SoCs. */ static const struct of_device_id loongson2_guts_of_match[] = { { .compatible = "loongson,ls2k-chipid", }, {} }; MODULE_DEVICE_TABLE(of, loongson2_guts_of_match); static struct platform_driver loongson2_guts_driver = { .driver = { .name = "loongson2-guts", .of_match_table = loongson2_guts_of_match, }, .probe = loongson2_guts_probe, .remove_new = loongson2_guts_remove, }; static int __init loongson2_guts_init(void) { return platform_driver_register(&loongson2_guts_driver); } core_initcall(loongson2_guts_init); static void __exit loongson2_guts_exit(void) { platform_driver_unregister(&loongson2_guts_driver); } module_exit(loongson2_guts_exit); MODULE_DESCRIPTION("Loongson2 GUTS driver"); MODULE_LICENSE("GPL"); |