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/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2016 Imagination Technologies * Author: Paul Burton <paul.burton@mips.com> */ #ifndef __MIPS_ASM_MACHINE_H__ #define __MIPS_ASM_MACHINE_H__ #include <linux/libfdt.h> #include <linux/of.h> struct mips_machine { const struct of_device_id *matches; const void *fdt; bool (*detect)(void); const void *(*fixup_fdt)(const void *fdt, const void *match_data); unsigned int (*measure_hpt_freq)(void); }; extern long __mips_machines_start; extern long __mips_machines_end; #define MIPS_MACHINE(name) \ static const struct mips_machine __mips_mach_##name \ __used __section(.mips.machines.init) #define for_each_mips_machine(mach) \ for ((mach) = (struct mips_machine *)&__mips_machines_start; \ (mach) < (struct mips_machine *)&__mips_machines_end; \ (mach)++) /** * mips_machine_is_compatible() - check if a machine is compatible with an FDT * @mach: the machine struct to check * @fdt: the FDT to check for compatibility with * * Check whether the given machine @mach is compatible with the given flattened * device tree @fdt, based upon the compatibility property of the root node. * * Return: the device id matched if any, else NULL */ static inline const struct of_device_id * mips_machine_is_compatible(const struct mips_machine *mach, const void *fdt) { const struct of_device_id *match; if (!mach->matches) return NULL; for (match = mach->matches; match->compatible[0]; match++) { if (fdt_node_check_compatible(fdt, 0, match->compatible) == 0) return match; } return NULL; } /** * struct mips_fdt_fixup - Describe a fixup to apply to an FDT * @apply: applies the fixup to @fdt, returns zero on success else -errno * @description: a short description of the fixup * * Describes a fixup applied to an FDT blob by the @apply function. The * @description field provides a short description of the fixup intended for * use in error messages if the @apply function returns non-zero. */ struct mips_fdt_fixup { int (*apply)(void *fdt); const char *description; }; /** * apply_mips_fdt_fixups() - apply fixups to an FDT blob * @fdt_out: buffer in which to place the fixed-up FDT * @fdt_out_size: the size of the @fdt_out buffer * @fdt_in: the FDT blob * @fixups: pointer to an array of fixups to be applied * * Loop through the array of fixups pointed to by @fixups, calling the apply * function on each until either one returns an error or we reach the end of * the list as indicated by an entry with a NULL apply field. * * Return: zero on success, else -errno */ extern int __init apply_mips_fdt_fixups(void *fdt_out, size_t fdt_out_size, const void *fdt_in, const struct mips_fdt_fixup *fixups); #endif /* __MIPS_ASM_MACHINE_H__ */
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