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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 | // SPDX-License-Identifier: GPL-2.0 /* * Nuvoton WPCM450 SoC Identification * * Copyright (C) 2022 Jonathan Neuschäfer */ #include <linux/mfd/syscon.h> #include <linux/of.h> #include <linux/regmap.h> #include <linux/slab.h> #include <linux/sys_soc.h> #define GCR_PDID 0 #define PDID_CHIP(x) ((x) & 0x00ffffff) #define CHIP_WPCM450 0x926450 #define PDID_REV(x) ((x) >> 24) struct revision { u8 number; const char *name; }; static const struct revision revisions[] __initconst = { { 0x00, "Z1" }, { 0x03, "Z2" }, { 0x04, "Z21" }, { 0x08, "A1" }, { 0x09, "A2" }, { 0x0a, "A3" }, {} }; static const char * __init get_revision(unsigned int rev) { int i; for (i = 0; revisions[i].name; i++) if (revisions[i].number == rev) return revisions[i].name; return NULL; } static struct soc_device_attribute *wpcm450_attr; static struct soc_device *wpcm450_soc; static int __init wpcm450_soc_init(void) { struct soc_device_attribute *attr; struct soc_device *soc; const char *revision; struct regmap *gcr; u32 pdid; int ret; if (!of_machine_is_compatible("nuvoton,wpcm450")) return 0; gcr = syscon_regmap_lookup_by_compatible("nuvoton,wpcm450-gcr"); if (IS_ERR(gcr)) return PTR_ERR(gcr); ret = regmap_read(gcr, GCR_PDID, &pdid); if (ret) return ret; if (PDID_CHIP(pdid) != CHIP_WPCM450) { pr_warn("Unknown chip ID in GCR.PDID: 0x%06x\n", PDID_CHIP(pdid)); return -ENODEV; } revision = get_revision(PDID_REV(pdid)); if (!revision) { pr_warn("Unknown chip revision in GCR.PDID: 0x%02x\n", PDID_REV(pdid)); return -ENODEV; } attr = kzalloc(sizeof(*attr), GFP_KERNEL); if (!attr) return -ENOMEM; attr->family = "Nuvoton NPCM"; attr->soc_id = "WPCM450"; attr->revision = revision; soc = soc_device_register(attr); if (IS_ERR(soc)) { kfree(attr); pr_warn("Could not register SoC device\n"); return PTR_ERR(soc); } wpcm450_soc = soc; wpcm450_attr = attr; return 0; } module_init(wpcm450_soc_init); static void __exit wpcm450_soc_exit(void) { if (wpcm450_soc) { soc_device_unregister(wpcm450_soc); wpcm450_soc = NULL; kfree(wpcm450_attr); } } module_exit(wpcm450_soc_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Jonathan Neuschäfer"); MODULE_DESCRIPTION("Nuvoton WPCM450 SoC Identification driver"); |