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         unsigned int pack_mask;
  47 } soc_packages[] = {
  48         { "S905", 0x1f, 0, 0x20 }, /* pack_id != 0x20 */
  49         { "S905H", 0x1f, 0x3, 0xf }, /* pack_id & 0xf == 0x3 */
  50         { "S905M", 0x1f, 0x20, 0xf0 }, /* pack_id == 0x20 */
  51         { "S905D", 0x21, 0, 0xf0 },
  52         { "S905X", 0x21, 0x80, 0xf0 },
  53         { "S905W", 0x21, 0xa0, 0xf0 },
  54         { "S905L", 0x21, 0xc0, 0xf0 },
  55         { "S905M2", 0x21, 0xe0, 0xf0 },
  56         { "S912", 0x22, 0, 0x0 }, /* Only S912 is known for GXM */
  57         { "962X", 0x24, 0x10, 0xf0 },
  58         { "962E", 0x24, 0x20, 0xf0 },
  59         { "A113X", 0x25, 0x37, 0xff },
  60         { "A113D", 0x25, 0x22, 0xff },
  61 };
  62
  63 static inline unsigned int socinfo_to_major(u32 socinfo)
  64 {
  65         return FIELD_GET(SOCINFO_MAJOR, socinfo);
  66 }
  67
  68 static inline unsigned int socinfo_to_minor(u32 socinfo)
  69 {
  70         return FIELD_GET(SOCINFO_MINOR, socinfo);
  71 }
  72
  73 static inline unsigned int socinfo_to_pack(u32 socinfo)
  74 {
  75         return FIELD_GET(SOCINFO_PACK, socinfo);
  76 }
  77
  78 static inline unsigned int socinfo_to_misc(u32 socinfo)
  79 {
  80         return FIELD_GET(SOCINFO_MISC, socinfo);
  81 }
  82
  83 static const char *socinfo_to_package_id(u32 socinfo)
  84 {
  85         unsigned int pack = socinfo_to_pack(socinfo);
  86         unsigned int major = socinfo_to_major(socinfo);
  87         int i;
  88
  89         for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
  90                 if (soc_packages[i].major_id == major &&
  91                     soc_packages[i].pack_id ==
  92                                 (pack & soc_packages[i].pack_mask))
  93                         return soc_packages[i].name;
  94         }
  95
  96         return "Unknown";
  97 }
  98
  99 static const char *socinfo_to_soc_id(u32 socinfo)
 100 {
 101         unsigned int id = socinfo_to_major(socinfo);
 102         int i;
 103
 104         for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
 105                 if (soc_ids[i].id == id)
 106                         return soc_ids[i].name;
 107         }
 108
 109         return "Unknown";
 110 }
 111
 112 static int __init meson_gx_socinfo_init(void)
 113 {
 114         struct soc_device_attribute *soc_dev_attr;
 115         struct soc_device *soc_dev;
 116         struct device_node *np;
 117         struct regmap *regmap;
 118         unsigned int socinfo;
 119         struct device *dev;
 120         int ret;
 121
 122         /* look up for chipid node */
 123         np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
 124         if (!np)
 125                 return -ENODEV;
 126
 127         /* check if interface is enabled */
 128         if (!of_device_is_available(np))
 129                 return -ENODEV;
 130
 131         /* check if chip-id is available */
 132         if (!of_property_read_bool(np, "amlogic,has-chip-id"))
 133                 return -ENODEV;
 134
 135         /* node should be a syscon */
 136         regmap = syscon_node_to_regmap(np);
 137         of_node_put(np);
 138         if (IS_ERR(regmap)) {
 139                 pr_err("%s: failed to get regmap\n", __func__);
 140                 return -ENODEV;
 141         }
 142
 143         ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
 144         if (ret < 0)
 145                 return ret;
 146
 147         if (!socinfo) {
 148                 pr_err("%s: invalid chipid value\n", __func__);
 149                 return -EINVAL;
 150         }
 151
 152         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 153         if (!soc_dev_attr)
 154                 return -ENODEV;
 155
 156         soc_dev_attr->family = "Amlogic Meson";
 157
 158         np = of_find_node_by_path("/");
 159         of_property_read_string(np, "model", &soc_dev_attr->machine);
 160         of_node_put(np);
 161
 162         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
 163                                            socinfo_to_major(socinfo),
 164                                            socinfo_to_minor(socinfo),
 165                                            socinfo_to_pack(socinfo),
 166                                            socinfo_to_misc(socinfo));
 167         soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
 168                                          socinfo_to_soc_id(socinfo),
 169                                          socinfo_to_package_id(socinfo));
 170
 171         soc_dev = soc_device_register(soc_dev_attr);
 172         if (IS_ERR(soc_dev)) {
 173                 kfree(soc_dev_attr->revision);
 174                 kfree_const(soc_dev_attr->soc_id);
 175                 kfree(soc_dev_attr);
 176                 return PTR_ERR(soc_dev);
 177         }
 178         dev = soc_device_to_device(soc_dev);
 179
 180         dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
 181                         soc_dev_attr->soc_id,
 182                         socinfo_to_major(socinfo),
 183                         socinfo_to_minor(socinfo),
 184                         socinfo_to_pack(socinfo),
 185                         socinfo_to_misc(socinfo));
 186
 187         return 0;
 188 }
 189 device_initcall(meson_gx_socinfo_init);