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         { "TXLX", 0x24 },
  37         { "AXG", 0x25 },
  38         { "GXLX", 0x26 },
  39         { "TXHD", 0x27 },
  40 };
  41
  42 static const struct meson_gx_package_id {
  43         const char *name;
  44         unsigned int major_id;
  45         unsigned int pack_id;
  46 } soc_packages[] = {
  47         { "S905", 0x1f, 0 },
  48         { "S905H", 0x1f, 0x13 },
  49         { "S905M", 0x1f, 0x20 },
  50         { "S905D", 0x21, 0 },
  51         { "S905X", 0x21, 0x80 },
  52         { "S905W", 0x21, 0xa0 },
  53         { "S905L", 0x21, 0xc0 },
  54         { "S905M2", 0x21, 0xe0 },
  55         { "S912", 0x22, 0 },
  56         { "962X", 0x24, 0x10 },
  57         { "962E", 0x24, 0x20 },
  58         { "A113X", 0x25, 0x37 },
  59         { "A113D", 0x25, 0x22 },
  60 };
  61
  62 static inline unsigned int socinfo_to_major(u32 socinfo)
  63 {
  64         return FIELD_GET(SOCINFO_MAJOR, socinfo);
  65 }
  66
  67 static inline unsigned int socinfo_to_minor(u32 socinfo)
  68 {
  69         return FIELD_GET(SOCINFO_MINOR, socinfo);
  70 }
  71
  72 static inline unsigned int socinfo_to_pack(u32 socinfo)
  73 {
  74         return FIELD_GET(SOCINFO_PACK, socinfo);
  75 }
  76
  77 static inline unsigned int socinfo_to_misc(u32 socinfo)
  78 {
  79         return FIELD_GET(SOCINFO_MISC, socinfo);
  80 }
  81
  82 static const char *socinfo_to_package_id(u32 socinfo)
  83 {
  84         unsigned int pack = socinfo_to_pack(socinfo) & 0xf0;
  85         unsigned int major = socinfo_to_major(socinfo);
  86         int i;
  87
  88         for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
  89                 if (soc_packages[i].major_id == major &&
  90                     soc_packages[i].pack_id == pack)
  91                         return soc_packages[i].name;
  92         }
  93
  94         return "Unknown";
  95 }
  96
  97 static const char *socinfo_to_soc_id(u32 socinfo)
  98 {
  99         unsigned int id = socinfo_to_major(socinfo);
 100         int i;
 101
 102         for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
 103                 if (soc_ids[i].id == id)
 104                         return soc_ids[i].name;
 105         }
 106
 107         return "Unknown";
 108 }
 109
 110 static int __init meson_gx_socinfo_init(void)
 111 {
 112         struct soc_device_attribute *soc_dev_attr;
 113         struct soc_device *soc_dev;
 114         struct device_node *np;
 115         struct regmap *regmap;
 116         unsigned int socinfo;
 117         struct device *dev;
 118         int ret;
 119
 120         /* look up for chipid node */
 121         np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
 122         if (!np)
 123                 return -ENODEV;
 124
 125         /* check if interface is enabled */
 126         if (!of_device_is_available(np))
 127                 return -ENODEV;
 128
 129         /* check if chip-id is available */
 130         if (!of_property_read_bool(np, "amlogic,has-chip-id"))
 131                 return -ENODEV;
 132
 133         /* node should be a syscon */
 134         regmap = syscon_node_to_regmap(np);
 135         of_node_put(np);
 136         if (IS_ERR(regmap)) {
 137                 pr_err("%s: failed to get regmap\n", __func__);
 138                 return -ENODEV;
 139         }
 140
 141         ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
 142         if (ret < 0)
 143                 return ret;
 144
 145         if (!socinfo) {
 146                 pr_err("%s: invalid chipid value\n", __func__);
 147                 return -EINVAL;
 148         }
 149
 150         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 151         if (!soc_dev_attr)
 152                 return -ENODEV;
 153
 154         soc_dev_attr->family = "Amlogic Meson";
 155
 156         np = of_find_node_by_path("/");
 157         of_property_read_string(np, "model", &soc_dev_attr->machine);
 158         of_node_put(np);
 159
 160         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
 161                                            socinfo_to_major(socinfo),
 162                                            socinfo_to_minor(socinfo),
 163                                            socinfo_to_pack(socinfo),
 164                                            socinfo_to_misc(socinfo));
 165         soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
 166                                          socinfo_to_soc_id(socinfo),
 167                                          socinfo_to_package_id(socinfo));
 168
 169         soc_dev = soc_device_register(soc_dev_attr);
 170         if (IS_ERR(soc_dev)) {
 171                 kfree(soc_dev_attr->revision);
 172                 kfree_const(soc_dev_attr->soc_id);
 173                 kfree(soc_dev_attr);
 174                 return PTR_ERR(soc_dev);
 175         }
 176         dev = soc_device_to_device(soc_dev);
 177
 178         dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
 179                         soc_dev_attr->soc_id,
 180                         socinfo_to_major(socinfo),
 181                         socinfo_to_minor(socinfo),
 182                         socinfo_to_pack(socinfo),
 183                         socinfo_to_misc(socinfo));
 184
 185         return 0;
 186 }
 187 device_initcall(meson_gx_socinfo_init);