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

   1 /*
   2  * Copyright (c) 2017 BayLibre, SAS
   3  * Author: Neil Armstrong <narmstrong@baylibre.com>
   4  *
   5  * SPDX-License-Identifier: GPL-2.0+
   6  */
   7
   8 #include <linux/io.h>
   9 #include <linux/of.h>
  10 #include <linux/of_address.h>
  11 #include <linux/of_platform.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/slab.h>
  14 #include <linux/sys_soc.h>
  15 #include <linux/bitfield.h>
  16 #include <linux/regmap.h>
  17 #include <linux/mfd/syscon.h>
  18
  19 #define AO_SEC_SD_CFG8          0xe0
  20 #define AO_SEC_SOCINFO_OFFSET   AO_SEC_SD_CFG8
  21
  22 #define SOCINFO_MAJOR   GENMASK(31, 24)
  23 #define SOCINFO_PACK    GENMASK(23, 16)
  24 #define SOCINFO_MINOR   GENMASK(15, 8)
  25 #define SOCINFO_MISC    GENMASK(7, 0)
  26
  27 static const struct meson_gx_soc_id {
  28         const char *name;
  29         unsigned int id;
  30 } soc_ids[] = {
  31         { "GXBB", 0x1f },
  32         { "GXTVBB", 0x20 },
  33         { "GXL", 0x21 },
  34         { "GXM", 0x22 },
  35         { "TXL", 0x23 },
  36 };
  37
  38 static const struct meson_gx_package_id {
  39         const char *name;
  40         unsigned int major_id;
  41         unsigned int pack_id;
  42 } soc_packages[] = {
  43         { "S905", 0x1f, 0 },
  44         { "S905M", 0x1f, 0x20 },
  45         { "S905D", 0x21, 0 },
  46         { "S905X", 0x21, 0x80 },
  47         { "S905L", 0x21, 0xc0 },
  48         { "S905M2", 0x21, 0xe0 },
  49         { "S912", 0x22, 0 },
  50 };
  51
  52 static inline unsigned int socinfo_to_major(u32 socinfo)
  53 {
  54         return FIELD_GET(SOCINFO_MAJOR, socinfo);
  55 }
  56
  57 static inline unsigned int socinfo_to_minor(u32 socinfo)
  58 {
  59         return FIELD_GET(SOCINFO_MINOR, socinfo);
  60 }
  61
  62 static inline unsigned int socinfo_to_pack(u32 socinfo)
  63 {
  64         return FIELD_GET(SOCINFO_PACK, socinfo);
  65 }
  66
  67 static inline unsigned int socinfo_to_misc(u32 socinfo)
  68 {
  69         return FIELD_GET(SOCINFO_MISC, socinfo);
  70 }
  71
  72 static const char *socinfo_to_package_id(u32 socinfo)
  73 {
  74         unsigned int pack = socinfo_to_pack(socinfo) & 0xf0;
  75         unsigned int major = socinfo_to_major(socinfo);
  76         int i;
  77
  78         for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
  79                 if (soc_packages[i].major_id == major &&
  80                     soc_packages[i].pack_id == pack)
  81                         return soc_packages[i].name;
  82         }
  83
  84         return "Unknown";
  85 }
  86
  87 static const char *socinfo_to_soc_id(u32 socinfo)
  88 {
  89         unsigned int id = socinfo_to_major(socinfo);
  90         int i;
  91
  92         for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
  93                 if (soc_ids[i].id == id)
  94                         return soc_ids[i].name;
  95         }
  96
  97         return "Unknown";
  98 }
  99
 100 int __init meson_gx_socinfo_init(void)
 101 {
 102         struct soc_device_attribute *soc_dev_attr;
 103         struct soc_device *soc_dev;
 104         struct device_node *np;
 105         struct regmap *regmap;
 106         unsigned int socinfo;
 107         struct device *dev;
 108         int ret;
 109
 110         /* look up for chipid node */
 111         np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
 112         if (!np)
 113                 return -ENODEV;
 114
 115         /* check if interface is enabled */
 116         if (!of_device_is_available(np))
 117                 return -ENODEV;
 118
 119         /* check if chip-id is available */
 120         if (!of_property_read_bool(np, "amlogic,has-chip-id"))
 121                 return -ENODEV;
 122
 123         /* node should be a syscon */
 124         regmap = syscon_node_to_regmap(np);
 125         of_node_put(np);
 126         if (IS_ERR(regmap)) {
 127                 pr_err("%s: failed to get regmap\n", __func__);
 128                 return -ENODEV;
 129         }
 130
 131         ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
 132         if (ret < 0)
 133                 return ret;
 134
 135         if (!socinfo) {
 136                 pr_err("%s: invalid chipid value\n", __func__);
 137                 return -EINVAL;
 138         }
 139
 140         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 141         if (!soc_dev_attr)
 142                 return -ENODEV;
 143
 144         soc_dev_attr->family = "Amlogic Meson";
 145
 146         np = of_find_node_by_path("/");
 147         of_property_read_string(np, "model", &soc_dev_attr->machine);
 148         of_node_put(np);
 149
 150         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
 151                                            socinfo_to_major(socinfo),
 152                                            socinfo_to_minor(socinfo),
 153                                            socinfo_to_pack(socinfo),
 154                                            socinfo_to_misc(socinfo));
 155         soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
 156                                          socinfo_to_soc_id(socinfo),
 157                                          socinfo_to_package_id(socinfo));
 158
 159         soc_dev = soc_device_register(soc_dev_attr);
 160         if (IS_ERR(soc_dev)) {
 161                 kfree(soc_dev_attr->revision);
 162                 kfree_const(soc_dev_attr->soc_id);
 163                 kfree(soc_dev_attr);
 164                 return PTR_ERR(soc_dev);
 165         }
 166         dev = soc_device_to_device(soc_dev);
 167
 168         dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
 169                         soc_dev_attr->soc_id,
 170                         socinfo_to_major(socinfo),
 171                         socinfo_to_minor(socinfo),
 172                         socinfo_to_pack(socinfo),
 173                         socinfo_to_misc(socinfo));
 174
 175         return 0;
 176 }
 177 device_initcall(meson_gx_socinfo_init);