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         { "G12A", 0x28 },
  41         { "G12B", 0x29 },
  42         { "SM1", 0x2b },
  43         { "A1", 0x2c },
  44 };
  45
  46 static const struct meson_gx_package_id {
  47         const char *name;
  48         unsigned int major_id;
  49         unsigned int pack_id;
  50         unsigned int pack_mask;
  51 } soc_packages[] = {
  52         { "S905", 0x1f, 0, 0x20 }, /* pack_id != 0x20 */
  53         { "S905H", 0x1f, 0x3, 0xf }, /* pack_id & 0xf == 0x3 */
  54         { "S905M", 0x1f, 0x20, 0xf0 }, /* pack_id == 0x20 */
  55         { "S905D", 0x21, 0, 0xf0 },
  56         { "S905X", 0x21, 0x80, 0xf0 },
  57         { "S905W", 0x21, 0xa0, 0xf0 },
  58         { "S905L", 0x21, 0xc0, 0xf0 },
  59         { "S905M2", 0x21, 0xe0, 0xf0 },
  60         { "S805X", 0x21, 0x30, 0xf0 },
  61         { "S805Y", 0x21, 0xb0, 0xf0 },
  62         { "S912", 0x22, 0, 0x0 }, /* Only S912 is known for GXM */
  63         { "962X", 0x24, 0x10, 0xf0 },
  64         { "962E", 0x24, 0x20, 0xf0 },
  65         { "A113X", 0x25, 0x37, 0xff },
  66         { "A113D", 0x25, 0x22, 0xff },
  67         { "S905D2", 0x28, 0x10, 0xf0 },
  68         { "S905X2", 0x28, 0x40, 0xf0 },
  69         { "A311D", 0x29, 0x10, 0xf0 },
  70         { "S922X", 0x29, 0x40, 0xf0 },
  71         { "S905D3", 0x2b, 0x4, 0xf5 },
  72         { "S905X3", 0x2b, 0x5, 0xf5 },
  73         { "S905X3", 0x2b, 0x10, 0x3f },
  74         { "S905D3", 0x2b, 0x30, 0x3f },
  75         { "A113L", 0x2c, 0x0, 0xf8 },
  76 };
  77
  78 static inline unsigned int socinfo_to_major(u32 socinfo)
  79 {
  80         return FIELD_GET(SOCINFO_MAJOR, socinfo);
  81 }
  82
  83 static inline unsigned int socinfo_to_minor(u32 socinfo)
  84 {
  85         return FIELD_GET(SOCINFO_MINOR, socinfo);
  86 }
  87
  88 static inline unsigned int socinfo_to_pack(u32 socinfo)
  89 {
  90         return FIELD_GET(SOCINFO_PACK, socinfo);
  91 }
  92
  93 static inline unsigned int socinfo_to_misc(u32 socinfo)
  94 {
  95         return FIELD_GET(SOCINFO_MISC, socinfo);
  96 }
  97
  98 static const char *socinfo_to_package_id(u32 socinfo)
  99 {
 100         unsigned int pack = socinfo_to_pack(socinfo);
 101         unsigned int major = socinfo_to_major(socinfo);
 102         int i;
 103
 104         for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
 105                 if (soc_packages[i].major_id == major &&
 106                     soc_packages[i].pack_id ==
 107                                 (pack & soc_packages[i].pack_mask))
 108                         return soc_packages[i].name;
 109         }
 110
 111         return "Unknown";
 112 }
 113
 114 static const char *socinfo_to_soc_id(u32 socinfo)
 115 {
 116         unsigned int id = socinfo_to_major(socinfo);
 117         int i;
 118
 119         for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
 120                 if (soc_ids[i].id == id)
 121                         return soc_ids[i].name;
 122         }
 123
 124         return "Unknown";
 125 }
 126
 127 static int __init meson_gx_socinfo_init(void)
 128 {
 129         struct soc_device_attribute *soc_dev_attr;
 130         struct soc_device *soc_dev;
 131         struct device_node *np;
 132         struct regmap *regmap;
 133         unsigned int socinfo;
 134         struct device *dev;
 135         int ret;
 136
 137         /* look up for chipid node */
 138         np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
 139         if (!np)
 140                 return -ENODEV;
 141
 142         /* check if interface is enabled */
 143         if (!of_device_is_available(np)) {
 144                 of_node_put(np);
 145                 return -ENODEV;
 146         }
 147
 148         /* check if chip-id is available */
 149         if (!of_property_read_bool(np, "amlogic,has-chip-id")) {
 150                 of_node_put(np);
 151                 return -ENODEV;
 152         }
 153
 154         /* node should be a syscon */
 155         regmap = syscon_node_to_regmap(np);
 156         of_node_put(np);
 157         if (IS_ERR(regmap)) {
 158                 pr_err("%s: failed to get regmap\n", __func__);
 159                 return -ENODEV;
 160         }
 161
 162         ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
 163         if (ret < 0)
 164                 return ret;
 165
 166         if (!socinfo) {
 167                 pr_err("%s: invalid chipid value\n", __func__);
 168                 return -EINVAL;
 169         }
 170
 171         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 172         if (!soc_dev_attr)
 173                 return -ENODEV;
 174
 175         soc_dev_attr->family = "Amlogic Meson";
 176
 177         np = of_find_node_by_path("/");
 178         of_property_read_string(np, "model", &soc_dev_attr->machine);
 179         of_node_put(np);
 180
 181         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
 182                                            socinfo_to_major(socinfo),
 183                                            socinfo_to_minor(socinfo),
 184                                            socinfo_to_pack(socinfo),
 185                                            socinfo_to_misc(socinfo));
 186         soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
 187                                          socinfo_to_soc_id(socinfo),
 188                                          socinfo_to_package_id(socinfo));
 189
 190         soc_dev = soc_device_register(soc_dev_attr);
 191         if (IS_ERR(soc_dev)) {
 192                 kfree(soc_dev_attr->revision);
 193                 kfree_const(soc_dev_attr->soc_id);
 194                 kfree(soc_dev_attr);
 195                 return PTR_ERR(soc_dev);
 196         }
 197         dev = soc_device_to_device(soc_dev);
 198
 199         dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
 200                         soc_dev_attr->soc_id,
 201                         socinfo_to_major(socinfo),
 202                         socinfo_to_minor(socinfo),
 203                         socinfo_to_pack(socinfo),
 204                         socinfo_to_misc(socinfo));
 205
 206         return 0;
 207 }
 208 device_initcall(meson_gx_socinfo_init);