arch/arc/include/asm/mach_desc.h

   1 /*
   2  * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * based on METAG mach/arch.h (which in turn was based on ARM)
   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 version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #ifndef _ASM_ARC_MACH_DESC_H_
  12 #define _ASM_ARC_MACH_DESC_H_
  13
  14 /**
  15  * struct machine_desc - Board specific callbacks, called from ARC common code
  16  *      Provided by each ARC board using MACHINE_START()/MACHINE_END(), so
  17  *      a multi-platform kernel builds with array of such descriptors.
  18  *      We extend the early DT scan to also match the DT's "compatible" string
  19  *      against the @dt_compat of all such descriptors, and one with highest
  20  *      "DT score" is selected as global @machine_desc.
  21  *
  22  * @name:               Board/SoC name
  23  * @dt_compat:          Array of device tree 'compatible' strings
  24  *                      (XXX: although only 1st entry is looked at)
  25  * @init_early:         Very early callback [called from setup_arch()]
  26  * @init_per_cpu:       for each CPU as it is coming up (SMP as well as UP)
  27  *                      [(M):init_IRQ(), (o):start_kernel_secondary()]
  28  * @init_machine:       arch initcall level callback (e.g. populate static
  29  *                      platform devices or parse Devicetree)
  30  * @init_late:          Late initcall level callback
  31  *
  32  */
  33 struct machine_desc {
  34         const char              *name;
  35         const char              **dt_compat;
  36         void                    (*init_early)(void);
  37 #ifdef CONFIG_SMP
  38         void                    (*init_per_cpu)(unsigned int);
  39 #endif
  40         void                    (*init_machine)(void);
  41         void                    (*init_late)(void);
  42
  43 };
  44
  45 /*
  46  * Current machine - only accessible during boot.
  47  */
  48 extern const struct machine_desc *machine_desc;
  49
  50 /*
  51  * Machine type table - also only accessible during boot
  52  */
  53 extern const struct machine_desc __arch_info_begin[], __arch_info_end[];
  54
  55 /*
  56  * Set of macros to define architecture features.
  57  * This is built into a table by the linker.
  58  */
  59 #define MACHINE_START(_type, _name)                     \
  60 static const struct machine_desc __mach_desc_##_type    \
  61 __used                                                  \
  62 __attribute__((__section__(".arch.info.init"))) = {     \
  63         .name           = _name,
  64
  65 #define MACHINE_END                             \
  66 };
  67
  68 extern const struct machine_desc *setup_machine_fdt(void *dt);
  69
  70 #endif