soc/amlogic/meson-mx-socinfo.c

0001 /*
0002  * Copyright (c) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
0003  *
0004  * SPDX-License-Identifier: GPL-2.0+
0005  */
0006
0007 #include <linux/io.h>
0008 #include <linux/of.h>
0009 #include <linux/of_address.h>
0010 #include <linux/of_platform.h>
0011 #include <linux/platform_device.h>
0012 #include <linux/slab.h>
0013 #include <linux/sys_soc.h>
0014 #include <linux/bitfield.h>
0015 #include <linux/regmap.h>
0016 #include <linux/mfd/syscon.h>
0017
0018 #define MESON_SOCINFO_MAJOR_VER_MESON6      0x16
0019 #define MESON_SOCINFO_MAJOR_VER_MESON8      0x19
0020 #define MESON_SOCINFO_MAJOR_VER_MESON8B     0x1b
0021
0022 #define MESON_MX_ASSIST_HW_REV          0x14c
0023
0024 #define MESON_MX_ANALOG_TOP_METAL_REVISION  0x0
0025
0026 #define MESON_MX_BOOTROM_MISC_VER       0x4
0027
0028 static const char *meson_mx_socinfo_revision(unsigned int major_ver,
0029                          unsigned int misc_ver,
0030                          unsigned int metal_rev)
0031 {
0032     unsigned int minor_ver;
0033
0034     switch (major_ver) {
0035     case MESON_SOCINFO_MAJOR_VER_MESON6:
0036         minor_ver = 0xa;
0037         break;
0038
0039     case MESON_SOCINFO_MAJOR_VER_MESON8:
0040         if (metal_rev == 0x11111112)
0041             major_ver = 0x1d;
0042
0043         if (metal_rev == 0x11111111 || metal_rev == 0x11111112)
0044             minor_ver = 0xa;
0045         else if (metal_rev == 0x11111113)
0046             minor_ver = 0xb;
0047         else if (metal_rev == 0x11111133)
0048             minor_ver = 0xc;
0049         else
0050             minor_ver = 0xd;
0051
0052         break;
0053
0054     case MESON_SOCINFO_MAJOR_VER_MESON8B:
0055         if (metal_rev == 0x11111111)
0056             minor_ver = 0xa;
0057         else
0058             minor_ver = 0xb;
0059
0060         break;
0061
0062     default:
0063         minor_ver = 0x0;
0064         break;
0065     }
0066
0067     return kasprintf(GFP_KERNEL, "Rev%X (%x - 0:%X)", minor_ver, major_ver,
0068              misc_ver);
0069 }
0070
0071 static const char *meson_mx_socinfo_soc_id(unsigned int major_ver,
0072                        unsigned int metal_rev)
0073 {
0074     const char *soc_id;
0075
0076     switch (major_ver) {
0077     case MESON_SOCINFO_MAJOR_VER_MESON6:
0078         soc_id = "Meson6 (AML8726-MX)";
0079         break;
0080
0081     case MESON_SOCINFO_MAJOR_VER_MESON8:
0082         if (metal_rev == 0x11111112)
0083             soc_id = "Meson8m2 (S812)";
0084         else
0085             soc_id = "Meson8 (S802)";
0086
0087         break;
0088
0089     case MESON_SOCINFO_MAJOR_VER_MESON8B:
0090         soc_id = "Meson8b (S805)";
0091         break;
0092
0093     default:
0094         soc_id = "Unknown";
0095         break;
0096     }
0097
0098     return kstrdup_const(soc_id, GFP_KERNEL);
0099 }
0100
0101 static const struct of_device_id meson_mx_socinfo_analog_top_ids[] = {
0102     { .compatible = "amlogic,meson8-analog-top", },
0103     { .compatible = "amlogic,meson8b-analog-top", },
0104     { /* sentinel */ }
0105 };
0106
0107 static int __init meson_mx_socinfo_init(void)
0108 {
0109     struct soc_device_attribute *soc_dev_attr;
0110     struct soc_device *soc_dev;
0111     struct device_node *np;
0112     struct regmap *assist_regmap, *bootrom_regmap, *analog_top_regmap;
0113     unsigned int major_ver, misc_ver, metal_rev = 0;
0114     int ret;
0115
0116     assist_regmap =
0117         syscon_regmap_lookup_by_compatible("amlogic,meson-mx-assist");
0118     if (IS_ERR(assist_regmap))
0119         return PTR_ERR(assist_regmap);
0120
0121     bootrom_regmap =
0122         syscon_regmap_lookup_by_compatible("amlogic,meson-mx-bootrom");
0123     if (IS_ERR(bootrom_regmap))
0124         return PTR_ERR(bootrom_regmap);
0125
0126     np = of_find_matching_node(NULL, meson_mx_socinfo_analog_top_ids);
0127     if (np) {
0128         analog_top_regmap = syscon_node_to_regmap(np);
0129         of_node_put(np);
0130         if (IS_ERR(analog_top_regmap))
0131             return PTR_ERR(analog_top_regmap);
0132
0133         ret = regmap_read(analog_top_regmap,
0134                   MESON_MX_ANALOG_TOP_METAL_REVISION,
0135                   &metal_rev);
0136         if (ret)
0137             return ret;
0138     }
0139
0140     ret = regmap_read(assist_regmap, MESON_MX_ASSIST_HW_REV, &major_ver);
0141     if (ret < 0)
0142         return ret;
0143
0144     ret = regmap_read(bootrom_regmap, MESON_MX_BOOTROM_MISC_VER,
0145               &misc_ver);
0146     if (ret < 0)
0147         return ret;
0148
0149     soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
0150     if (!soc_dev_attr)
0151         return -ENODEV;
0152
0153     soc_dev_attr->family = "Amlogic Meson";
0154
0155     np = of_find_node_by_path("/");
0156     of_property_read_string(np, "model", &soc_dev_attr->machine);
0157     of_node_put(np);
0158
0159     soc_dev_attr->revision = meson_mx_socinfo_revision(major_ver, misc_ver,
0160                                metal_rev);
0161     soc_dev_attr->soc_id = meson_mx_socinfo_soc_id(major_ver, metal_rev);
0162
0163     soc_dev = soc_device_register(soc_dev_attr);
0164     if (IS_ERR(soc_dev)) {
0165         kfree_const(soc_dev_attr->revision);
0166         kfree_const(soc_dev_attr->soc_id);
0167         kfree(soc_dev_attr);
0168         return PTR_ERR(soc_dev);
0169     }
0170
0171     dev_info(soc_device_to_device(soc_dev), "Amlogic %s %s detected\n",
0172          soc_dev_attr->soc_id, soc_dev_attr->revision);
0173
0174     return 0;
0175 }
0176 device_initcall(meson_mx_socinfo_init);