LXR linux/arch/metag/include/asm/mach/arch.h

   1/*
   2 * arch/metag/include/asm/mach/arch.h
   3 *
   4 * Copyright (C) 2012 Imagination Technologies Ltd.
   5 *
   6 * based on the ARM version:
   7 *  Copyright (C) 2000 Russell King
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14#ifndef _METAG_MACH_ARCH_H_
  15#define _METAG_MACH_ARCH_H_
  16
  17#include <linux/stddef.h>
  18
  19#include <asm/clock.h>
  20
  21/**
  22 * struct machine_desc - Describes a board controlled by a Meta.
  23 * @name:               Board/SoC name.
  24 * @dt_compat:          Array of device tree 'compatible' strings.
  25 * @clocks:             Clock callbacks.
  26 *
  27 * @nr_irqs:            Maximum number of IRQs.
  28 *                      If 0, defaults to NR_IRQS in asm-generic/irq.h.
  29 *
  30 * @init_early:         Early init callback.
  31 * @init_irq:           IRQ init callback for setting up IRQ controllers.
  32 * @init_machine:       Arch init callback for setting up devices.
  33 * @init_late:          Late init callback.
  34 *
  35 * This structure is provided by each board which can be controlled by a Meta.
  36 * It is chosen by matching the compatible strings in the device tree provided
  37 * by the bootloader with the strings in @dt_compat, and sets up any aspects of
  38 * the machine that aren't configured with device tree (yet).
  39 */
  40struct machine_desc {
  41        const char              *name;
  42        const char              **dt_compat;
  43        struct meta_clock_desc  *clocks;
  44
  45        unsigned int            nr_irqs;
  46
  47        void                    (*init_early)(void);
  48        void                    (*init_irq)(void);
  49        void                    (*init_machine)(void);
  50        void                    (*init_late)(void);
  51};
  52
  53/*
  54 * Current machine - only accessible during boot.
  55 */
  56extern const struct machine_desc *machine_desc;
  57
  58/*
  59 * Machine type table - also only accessible during boot
  60 */
  61extern struct machine_desc __arch_info_begin[], __arch_info_end[];
  62#define for_each_machine_desc(p)                        \
  63        for (p = __arch_info_begin; p < __arch_info_end; p++)
  64
  65static inline struct machine_desc *default_machine_desc(void)
  66{
  67        /* the default machine is the last one linked in */
  68        if (__arch_info_end - 1 < __arch_info_begin)
  69                return NULL;
  70        return __arch_info_end - 1;
  71}
  72
  73/*
  74 * Set of macros to define architecture features.  This is built into
  75 * a table by the linker.
  76 */
  77#define MACHINE_START(_type, _name)                     \
  78static const struct machine_desc __mach_desc_##_type    \
  79__used                                                  \
  80__attribute__((__section__(".arch.info.init"))) = {     \
  81        .name           = _name,
  82
  83#define MACHINE_END                             \
  84};
  85
  86#endif /* _METAG_MACH_ARCH_H_ */
  87