drivers/soc/renesas/renesas-soc.c

   1 /*
   2  * Renesas SoC Identification
   3  *
   4  * Copyright (C) 2014-2016 Glider bvba
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/io.h>
  17 #include <linux/of.h>
  18 #include <linux/of_address.h>
  19 #include <linux/slab.h>
  20 #include <linux/string.h>
  21 #include <linux/sys_soc.h>
  22
  23
  24 struct renesas_family {
  25         const char name[16];
  26         u32 reg;                        /* CCCR or PRR, if not in DT */
  27 };
  28
  29 static const struct renesas_family fam_rcar_gen1 __initconst __maybe_unused = {
  30         .name   = "R-Car Gen1",
  31         .reg    = 0xff000044,           /* PRR (Product Register) */
  32 };
  33
  34 static const struct renesas_family fam_rcar_gen2 __initconst __maybe_unused = {
  35         .name   = "R-Car Gen2",
  36         .reg    = 0xff000044,           /* PRR (Product Register) */
  37 };
  38
  39 static const struct renesas_family fam_rcar_gen3 __initconst __maybe_unused = {
  40         .name   = "R-Car Gen3",
  41         .reg    = 0xfff00044,           /* PRR (Product Register) */
  42 };
  43
  44 static const struct renesas_family fam_rmobile __initconst __maybe_unused = {
  45         .name   = "R-Mobile",
  46         .reg    = 0xe600101c,           /* CCCR (Common Chip Code Register) */
  47 };
  48
  49 static const struct renesas_family fam_rza __initconst __maybe_unused = {
  50         .name   = "RZ/A",
  51 };
  52
  53 static const struct renesas_family fam_rzg __initconst __maybe_unused = {
  54         .name   = "RZ/G",
  55         .reg    = 0xff000044,           /* PRR (Product Register) */
  56 };
  57
  58 static const struct renesas_family fam_shmobile __initconst __maybe_unused = {
  59         .name   = "SH-Mobile",
  60         .reg    = 0xe600101c,           /* CCCR (Common Chip Code Register) */
  61 };
  62
  63
  64 struct renesas_soc {
  65         const struct renesas_family *family;
  66         u8 id;
  67 };
  68
  69 static const struct renesas_soc soc_rz_a1h __initconst __maybe_unused = {
  70         .family = &fam_rza,
  71 };
  72
  73 static const struct renesas_soc soc_rmobile_ape6 __initconst __maybe_unused = {
  74         .family = &fam_rmobile,
  75         .id     = 0x3f,
  76 };
  77
  78 static const struct renesas_soc soc_rmobile_a1 __initconst __maybe_unused = {
  79         .family = &fam_rmobile,
  80         .id     = 0x40,
  81 };
  82
  83 static const struct renesas_soc soc_rz_g1h __initconst __maybe_unused = {
  84         .family = &fam_rzg,
  85         .id     = 0x45,
  86 };
  87
  88 static const struct renesas_soc soc_rz_g1m __initconst __maybe_unused = {
  89         .family = &fam_rzg,
  90         .id     = 0x47,
  91 };
  92
  93 static const struct renesas_soc soc_rz_g1n __initconst __maybe_unused = {
  94         .family = &fam_rzg,
  95         .id     = 0x4b,
  96 };
  97
  98 static const struct renesas_soc soc_rz_g1e __initconst __maybe_unused = {
  99         .family = &fam_rzg,
 100         .id     = 0x4c,
 101 };
 102
 103 static const struct renesas_soc soc_rcar_m1a __initconst __maybe_unused = {
 104         .family = &fam_rcar_gen1,
 105 };
 106
 107 static const struct renesas_soc soc_rcar_h1 __initconst __maybe_unused = {
 108         .family = &fam_rcar_gen1,
 109         .id     = 0x3b,
 110 };
 111
 112 static const struct renesas_soc soc_rcar_h2 __initconst __maybe_unused = {
 113         .family = &fam_rcar_gen2,
 114         .id     = 0x45,
 115 };
 116
 117 static const struct renesas_soc soc_rcar_m2_w __initconst __maybe_unused = {
 118         .family = &fam_rcar_gen2,
 119         .id     = 0x47,
 120 };
 121
 122 static const struct renesas_soc soc_rcar_v2h __initconst __maybe_unused = {
 123         .family = &fam_rcar_gen2,
 124         .id     = 0x4a,
 125 };
 126
 127 static const struct renesas_soc soc_rcar_m2_n __initconst __maybe_unused = {
 128         .family = &fam_rcar_gen2,
 129         .id     = 0x4b,
 130 };
 131
 132 static const struct renesas_soc soc_rcar_e2 __initconst __maybe_unused = {
 133         .family = &fam_rcar_gen2,
 134         .id     = 0x4c,
 135 };
 136
 137 static const struct renesas_soc soc_rcar_h3 __initconst __maybe_unused = {
 138         .family = &fam_rcar_gen3,
 139         .id     = 0x4f,
 140 };
 141
 142 static const struct renesas_soc soc_rcar_m3_w __initconst __maybe_unused = {
 143         .family = &fam_rcar_gen3,
 144         .id     = 0x52,
 145 };
 146
 147 static const struct renesas_soc soc_shmobile_ag5 __initconst __maybe_unused = {
 148         .family = &fam_shmobile,
 149         .id     = 0x37,
 150 };
 151
 152
 153 static const struct of_device_id renesas_socs[] __initconst = {
 154 #ifdef CONFIG_ARCH_R7S72100
 155         { .compatible = "renesas,r7s72100",     .data = &soc_rz_a1h },
 156 #endif
 157 #ifdef CONFIG_ARCH_R8A73A4
 158         { .compatible = "renesas,r8a73a4",      .data = &soc_rmobile_ape6 },
 159 #endif
 160 #ifdef CONFIG_ARCH_R8A7740
 161         { .compatible = "renesas,r8a7740",      .data = &soc_rmobile_a1 },
 162 #endif
 163 #ifdef CONFIG_ARCH_R8A7742
 164         { .compatible = "renesas,r8a7742",      .data = &soc_rz_g1h },
 165 #endif
 166 #ifdef CONFIG_ARCH_R8A7743
 167         { .compatible = "renesas,r8a7743",      .data = &soc_rz_g1m },
 168 #endif
 169 #ifdef CONFIG_ARCH_R8A7744
 170         { .compatible = "renesas,r8a7744",      .data = &soc_rz_g1n },
 171 #endif
 172 #ifdef CONFIG_ARCH_R8A7745
 173         { .compatible = "renesas,r8a7745",      .data = &soc_rz_g1e },
 174 #endif
 175 #ifdef CONFIG_ARCH_R8A7778
 176         { .compatible = "renesas,r8a7778",      .data = &soc_rcar_m1a },
 177 #endif
 178 #ifdef CONFIG_ARCH_R8A7779
 179         { .compatible = "renesas,r8a7779",      .data = &soc_rcar_h1 },
 180 #endif
 181 #ifdef CONFIG_ARCH_R8A7790
 182         { .compatible = "renesas,r8a7790",      .data = &soc_rcar_h2 },
 183 #endif
 184 #ifdef CONFIG_ARCH_R8A7791
 185         { .compatible = "renesas,r8a7791",      .data = &soc_rcar_m2_w },
 186 #endif
 187 #ifdef CONFIG_ARCH_R8A7792
 188         { .compatible = "renesas,r8a7792",      .data = &soc_rcar_v2h },
 189 #endif
 190 #ifdef CONFIG_ARCH_R8A7793
 191         { .compatible = "renesas,r8a7793",      .data = &soc_rcar_m2_n },
 192 #endif
 193 #ifdef CONFIG_ARCH_R8A7794
 194         { .compatible = "renesas,r8a7794",      .data = &soc_rcar_e2 },
 195 #endif
 196 #ifdef CONFIG_ARCH_R8A7795
 197         { .compatible = "renesas,r8a7795",      .data = &soc_rcar_h3 },
 198 #endif
 199 #ifdef CONFIG_ARCH_R8A7796
 200         { .compatible = "renesas,r8a7796",      .data = &soc_rcar_m3_w },
 201 #endif
 202 #ifdef CONFIG_ARCH_SH73A0
 203         { .compatible = "renesas,sh73a0",       .data = &soc_shmobile_ag5 },
 204 #endif
 205         { /* sentinel */ }
 206 };
 207
 208 static int __init renesas_soc_init(void)
 209 {
 210         struct soc_device_attribute *soc_dev_attr;
 211         const struct renesas_family *family;
 212         const struct of_device_id *match;
 213         const struct renesas_soc *soc;
 214         void __iomem *chipid = NULL;
 215         struct soc_device *soc_dev;
 216         struct device_node *np;
 217         unsigned int product;
 218
 219         match = of_match_node(renesas_socs, of_root);
 220         if (!match)
 221                 return -ENODEV;
 222
 223         soc = match->data;
 224         family = soc->family;
 225
 226         /* Try PRR first, then hardcoded fallback */
 227         np = of_find_compatible_node(NULL, NULL, "renesas,prr");
 228         if (np) {
 229                 chipid = of_iomap(np, 0);
 230                 of_node_put(np);
 231         } else if (soc->id) {
 232                 chipid = ioremap(family->reg, 4);
 233         }
 234         if (chipid) {
 235                 product = readl(chipid);
 236                 iounmap(chipid);
 237                 if (soc->id && ((product >> 8) & 0xff) != soc->id) {
 238                         pr_warn("SoC mismatch (product = 0x%x)\n", product);
 239                         return -ENODEV;
 240                 }
 241         }
 242
 243         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 244         if (!soc_dev_attr)
 245                 return -ENOMEM;
 246
 247         np = of_find_node_by_path("/");
 248         of_property_read_string(np, "model", &soc_dev_attr->machine);
 249         of_node_put(np);
 250
 251         soc_dev_attr->family = kstrdup_const(family->name, GFP_KERNEL);
 252         soc_dev_attr->soc_id = kstrdup_const(strchr(match->compatible, ',') + 1,
 253                                              GFP_KERNEL);
 254         if (chipid)
 255                 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "ES%u.%u",
 256                                                    ((product >> 4) & 0x0f) + 1,
 257                                                    product & 0xf);
 258
 259         pr_info("Detected Renesas %s %s %s\n", soc_dev_attr->family,
 260                 soc_dev_attr->soc_id, soc_dev_attr->revision ?: "");
 261
 262         soc_dev = soc_device_register(soc_dev_attr);
 263         if (IS_ERR(soc_dev)) {
 264                 kfree(soc_dev_attr->revision);
 265                 kfree_const(soc_dev_attr->soc_id);
 266                 kfree_const(soc_dev_attr->family);
 267                 kfree(soc_dev_attr);
 268                 return PTR_ERR(soc_dev);
 269         }
 270
 271         return 0;
 272 }
 273 early_initcall(renesas_soc_init);