drivers/soc/amlogic/meson-mx-socinfo.c

   1 /*
   2  * Copyright (c) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0+
   5  */
   6
   7 #include <linux/io.h>
   8 #include <linux/of.h>
   9 #include <linux/of_address.h>
  10 #include <linux/of_platform.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/slab.h>
  13 #include <linux/sys_soc.h>
  14 #include <linux/bitfield.h>
  15 #include <linux/regmap.h>
  16 #include <linux/mfd/syscon.h>
  17
  18 #define MESON_SOCINFO_MAJOR_VER_MESON6          0x16
  19 #define MESON_SOCINFO_MAJOR_VER_MESON8          0x19
  20 #define MESON_SOCINFO_MAJOR_VER_MESON8B         0x1b
  21
  22 #define MESON_MX_ASSIST_HW_REV                  0x14c
  23
  24 #define MESON_MX_ANALOG_TOP_METAL_REVISION      0x0
  25
  26 #define MESON_MX_BOOTROM_MISC_VER               0x4
  27
  28 static const char *meson_mx_socinfo_revision(unsigned int major_ver,
  29                                              unsigned int misc_ver,
  30                                              unsigned int metal_rev)
  31 {
  32         unsigned int minor_ver;
  33
  34         switch (major_ver) {
  35         case MESON_SOCINFO_MAJOR_VER_MESON6:
  36                 minor_ver = 0xa;
  37                 break;
  38
  39         case MESON_SOCINFO_MAJOR_VER_MESON8:
  40                 if (metal_rev == 0x11111112)
  41                         major_ver = 0x1d;
  42
  43                 if (metal_rev == 0x11111111 || metal_rev == 0x11111112)
  44                         minor_ver = 0xa;
  45                 else if (metal_rev == 0x11111113)
  46                         minor_ver = 0xb;
  47                 else if (metal_rev == 0x11111133)
  48                         minor_ver = 0xc;
  49                 else
  50                         minor_ver = 0xd;
  51
  52                 break;
  53
  54         case MESON_SOCINFO_MAJOR_VER_MESON8B:
  55                 if (metal_rev == 0x11111111)
  56                         minor_ver = 0xa;
  57                 else
  58                         minor_ver = 0xb;
  59
  60                 break;
  61
  62         default:
  63                 minor_ver = 0x0;
  64                 break;
  65         }
  66
  67         return kasprintf(GFP_KERNEL, "Rev%X (%x - 0:%X)", minor_ver, major_ver,
  68                          misc_ver);
  69 }
  70
  71 static const char *meson_mx_socinfo_soc_id(unsigned int major_ver,
  72                                            unsigned int metal_rev)
  73 {
  74         const char *soc_id;
  75
  76         switch (major_ver) {
  77         case MESON_SOCINFO_MAJOR_VER_MESON6:
  78                 soc_id = "Meson6 (AML8726-MX)";
  79                 break;
  80
  81         case MESON_SOCINFO_MAJOR_VER_MESON8:
  82                 if (metal_rev == 0x11111112)
  83                         soc_id = "Meson8m2 (S812)";
  84                 else
  85                         soc_id = "Meson8 (S802)";
  86
  87                 break;
  88
  89         case MESON_SOCINFO_MAJOR_VER_MESON8B:
  90                 soc_id = "Meson8b (S805)";
  91                 break;
  92
  93         default:
  94                 soc_id = "Unknown";
  95                 break;
  96         }
  97
  98         return kstrdup_const(soc_id, GFP_KERNEL);
  99 }
 100
 101 static const struct of_device_id meson_mx_socinfo_analog_top_ids[] = {
 102         { .compatible = "amlogic,meson8-analog-top", },
 103         { .compatible = "amlogic,meson8b-analog-top", },
 104         { /* sentinel */ }
 105 };
 106
 107 static int __init meson_mx_socinfo_init(void)
 108 {
 109         struct soc_device_attribute *soc_dev_attr;
 110         struct soc_device *soc_dev;
 111         struct device_node *np;
 112         struct regmap *assist_regmap, *bootrom_regmap, *analog_top_regmap;
 113         unsigned int major_ver, misc_ver, metal_rev = 0;
 114         int ret;
 115
 116         assist_regmap =
 117                 syscon_regmap_lookup_by_compatible("amlogic,meson-mx-assist");
 118         if (IS_ERR(assist_regmap))
 119                 return PTR_ERR(assist_regmap);
 120
 121         bootrom_regmap =
 122                 syscon_regmap_lookup_by_compatible("amlogic,meson-mx-bootrom");
 123         if (IS_ERR(bootrom_regmap))
 124                 return PTR_ERR(bootrom_regmap);
 125
 126         np = of_find_matching_node(NULL, meson_mx_socinfo_analog_top_ids);
 127         if (np) {
 128                 analog_top_regmap = syscon_node_to_regmap(np);
 129                 if (IS_ERR(analog_top_regmap))
 130                         return PTR_ERR(analog_top_regmap);
 131
 132                 ret = regmap_read(analog_top_regmap,
 133                                   MESON_MX_ANALOG_TOP_METAL_REVISION,
 134                                   &metal_rev);
 135                 if (ret)
 136                         return ret;
 137         }
 138
 139         ret = regmap_read(assist_regmap, MESON_MX_ASSIST_HW_REV, &major_ver);
 140         if (ret < 0)
 141                 return ret;
 142
 143         ret = regmap_read(bootrom_regmap, MESON_MX_BOOTROM_MISC_VER,
 144                           &misc_ver);
 145         if (ret < 0)
 146                 return ret;
 147
 148         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 149         if (!soc_dev_attr)
 150                 return -ENODEV;
 151
 152         soc_dev_attr->family = "Amlogic Meson";
 153
 154         np = of_find_node_by_path("/");
 155         of_property_read_string(np, "model", &soc_dev_attr->machine);
 156         of_node_put(np);
 157
 158         soc_dev_attr->revision = meson_mx_socinfo_revision(major_ver, misc_ver,
 159                                                            metal_rev);
 160         soc_dev_attr->soc_id = meson_mx_socinfo_soc_id(major_ver, metal_rev);
 161
 162         soc_dev = soc_device_register(soc_dev_attr);
 163         if (IS_ERR(soc_dev)) {
 164                 kfree_const(soc_dev_attr->revision);
 165                 kfree_const(soc_dev_attr->soc_id);
 166                 kfree(soc_dev_attr);
 167                 return PTR_ERR(soc_dev);
 168         }
 169
 170         dev_info(soc_device_to_device(soc_dev), "Amlogic %s %s detected\n",
 171                  soc_dev_attr->soc_id, soc_dev_attr->revision);
 172
 173         return 0;
 174 }
 175 device_initcall(meson_mx_socinfo_init);