arch/arc/include/asm/mach_desc.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
   4  *
   5  * based on METAG mach/arch.h (which in turn was based on ARM)
   6  */
   7
   8 #ifndef _ASM_ARC_MACH_DESC_H_
   9 #define _ASM_ARC_MACH_DESC_H_
  10
  11 /**
  12  * struct machine_desc - Board specific callbacks, called from ARC common code
  13  *      Provided by each ARC board using MACHINE_START()/MACHINE_END(), so
  14  *      a multi-platform kernel builds with array of such descriptors.
  15  *      We extend the early DT scan to also match the DT's "compatible" string
  16  *      against the @dt_compat of all such descriptors, and one with highest
  17  *      "DT score" is selected as global @machine_desc.
  18  *
  19  * @name:               Board/SoC name
  20  * @dt_compat:          Array of device tree 'compatible' strings
  21  *                      (XXX: although only 1st entry is looked at)
  22  * @init_early:         Very early callback [called from setup_arch()]
  23  * @init_per_cpu:       for each CPU as it is coming up (SMP as well as UP)
  24  *                      [(M):init_IRQ(), (o):start_kernel_secondary()]
  25  * @init_machine:       arch initcall level callback (e.g. populate static
  26  *                      platform devices or parse Devicetree)
  27  * @init_late:          Late initcall level callback
  28  *
  29  */
  30 struct machine_desc {
  31         const char              *name;
  32         const char              **dt_compat;
  33         void                    (*init_early)(void);
  34         void                    (*init_per_cpu)(unsigned int);
  35         void                    (*init_machine)(void);
  36         void                    (*init_late)(void);
  37
  38 };
  39
  40 /*
  41  * Current machine - only accessible during boot.
  42  */
  43 extern const struct machine_desc *machine_desc;
  44
  45 /*
  46  * Machine type table - also only accessible during boot
  47  */
  48 extern const struct machine_desc __arch_info_begin[], __arch_info_end[];
  49
  50 /*
  51  * Set of macros to define architecture features.
  52  * This is built into a table by the linker.
  53  */
  54 #define MACHINE_START(_type, _name)                     \
  55 static const struct machine_desc __mach_desc_##_type    \
  56 __used __section(".arch.info.init") = {                 \
  57         .name           = _name,
  58
  59 #define MACHINE_END                             \
  60 };
  61
  62 extern const struct machine_desc *setup_machine_fdt(void *dt);
  63
  64 #endif