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