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