arch/riscv/include/asm/soc.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright (C) 2020 Western Digital Corporation or its affiliates.
   4  * Copyright (C) 2020 Google, Inc
   5  */
   6
   7 #ifndef _ASM_RISCV_SOC_H
   8 #define _ASM_RISCV_SOC_H
   9
  10 #include <linux/of.h>
  11 #include <linux/linkage.h>
  12 #include <linux/types.h>
  13
  14 #define SOC_EARLY_INIT_DECLARE(name, compat, fn)                        \
  15         static const struct of_device_id __soc_early_init__##name       \
  16                 __used __section("__soc_early_init_table")              \
  17                  = { .compatible = compat, .data = fn  }
  18
  19 void soc_early_init(void);
  20
  21 extern unsigned long __soc_early_init_table_start;
  22 extern unsigned long __soc_early_init_table_end;
  23
  24 /*
  25  * Allows Linux to provide a device tree, which is necessary for SOCs that
  26  * don't provide a useful one on their own.
  27  */
  28 struct soc_builtin_dtb {
  29         unsigned long vendor_id;
  30         unsigned long arch_id;
  31         unsigned long imp_id;
  32         void *(*dtb_func)(void);
  33 };
  34
  35 /*
  36  * The argument name must specify a valid DTS file name without the dts
  37  * extension.
  38  */
  39 #define SOC_BUILTIN_DTB_DECLARE(name, vendor, arch, impl)               \
  40         extern void *__dtb_##name##_begin;                              \
  41                                                                         \
  42         static __init __used                                            \
  43         void *__soc_builtin_dtb_f__##name(void)                         \
  44         {                                                               \
  45                 return (void *)&__dtb_##name##_begin;                   \
  46         }                                                               \
  47                                                                         \
  48         static const struct soc_builtin_dtb __soc_builtin_dtb__##name   \
  49                 __used __section("__soc_builtin_dtb_table") =           \
  50         {                                                               \
  51                 .vendor_id = vendor,                                    \
  52                 .arch_id   = arch,                                      \
  53                 .imp_id    = impl,                                      \
  54                 .dtb_func  = __soc_builtin_dtb_f__##name,               \
  55         }
  56
  57 extern unsigned long __soc_builtin_dtb_table_start;
  58 extern unsigned long __soc_builtin_dtb_table_end;
  59
  60 void *soc_lookup_builtin_dtb(void);
  61
  62 #endif