arch/mips/include/asm/machine.h

   1 /*
   2  * Copyright (C) 2016 Imagination Technologies
   3  * Author: Paul Burton <paul.burton@imgtec.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation;  either version 2 of the  License, or (at your
   8  * option) any later version.
   9  */
  10
  11 #ifndef __MIPS_ASM_MACHINE_H__
  12 #define __MIPS_ASM_MACHINE_H__
  13
  14 #include <linux/libfdt.h>
  15 #include <linux/of.h>
  16
  17 struct mips_machine {
  18         const struct of_device_id *matches;
  19         const void *fdt;
  20         bool (*detect)(void);
  21         const void *(*fixup_fdt)(const void *fdt, const void *match_data);
  22         unsigned int (*measure_hpt_freq)(void);
  23 };
  24
  25 extern long __mips_machines_start;
  26 extern long __mips_machines_end;
  27
  28 #define MIPS_MACHINE(name)                                              \
  29         static const struct mips_machine __mips_mach_##name             \
  30                 __used __section(.mips.machines.init)
  31
  32 #define for_each_mips_machine(mach)                                     \
  33         for ((mach) = (struct mips_machine *)&__mips_machines_start;    \
  34              (mach) < (struct mips_machine *)&__mips_machines_end;      \
  35              (mach)++)
  36
  37 /**
  38  * mips_machine_is_compatible() - check if a machine is compatible with an FDT
  39  * @mach: the machine struct to check
  40  * @fdt: the FDT to check for compatibility with
  41  *
  42  * Check whether the given machine @mach is compatible with the given flattened
  43  * device tree @fdt, based upon the compatibility property of the root node.
  44  *
  45  * Return: the device id matched if any, else NULL
  46  */
  47 static inline const struct of_device_id *
  48 mips_machine_is_compatible(const struct mips_machine *mach, const void *fdt)
  49 {
  50         const struct of_device_id *match;
  51
  52         if (!mach->matches)
  53                 return NULL;
  54
  55         for (match = mach->matches; match->compatible; match++) {
  56                 if (fdt_node_check_compatible(fdt, 0, match->compatible) == 0)
  57                         return match;
  58         }
  59
  60         return NULL;
  61 }
  62
  63 #endif /* __MIPS_ASM_MACHINE_H__ */