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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
eed0eabd PB |
2 | /* |
3 | * Copyright (C) 2016 Imagination Technologies | |
fb615d61 | 4 | * Author: Paul Burton <paul.burton@mips.com> |
eed0eabd PB |
5 | */ |
6 | ||
7 | #ifndef __MIPS_ASM_MACHINE_H__ | |
8 | #define __MIPS_ASM_MACHINE_H__ | |
9 | ||
10 | #include <linux/libfdt.h> | |
11 | #include <linux/of.h> | |
12 | ||
13 | struct mips_machine { | |
14 | const struct of_device_id *matches; | |
15 | const void *fdt; | |
16 | bool (*detect)(void); | |
17 | const void *(*fixup_fdt)(const void *fdt, const void *match_data); | |
18 | unsigned int (*measure_hpt_freq)(void); | |
19 | }; | |
20 | ||
21 | extern long __mips_machines_start; | |
22 | extern long __mips_machines_end; | |
23 | ||
24 | #define MIPS_MACHINE(name) \ | |
25 | static const struct mips_machine __mips_mach_##name \ | |
26 | __used __section(.mips.machines.init) | |
27 | ||
28 | #define for_each_mips_machine(mach) \ | |
29 | for ((mach) = (struct mips_machine *)&__mips_machines_start; \ | |
30 | (mach) < (struct mips_machine *)&__mips_machines_end; \ | |
31 | (mach)++) | |
32 | ||
33 | /** | |
34 | * mips_machine_is_compatible() - check if a machine is compatible with an FDT | |
35 | * @mach: the machine struct to check | |
36 | * @fdt: the FDT to check for compatibility with | |
37 | * | |
38 | * Check whether the given machine @mach is compatible with the given flattened | |
39 | * device tree @fdt, based upon the compatibility property of the root node. | |
40 | * | |
41 | * Return: the device id matched if any, else NULL | |
42 | */ | |
43 | static inline const struct of_device_id * | |
44 | mips_machine_is_compatible(const struct mips_machine *mach, const void *fdt) | |
45 | { | |
46 | const struct of_device_id *match; | |
47 | ||
48 | if (!mach->matches) | |
49 | return NULL; | |
50 | ||
9a9ab307 | 51 | for (match = mach->matches; match->compatible[0]; match++) { |
eed0eabd PB |
52 | if (fdt_node_check_compatible(fdt, 0, match->compatible) == 0) |
53 | return match; | |
54 | } | |
55 | ||
56 | return NULL; | |
57 | } | |
58 | ||
e889dfca PB |
59 | /** |
60 | * struct mips_fdt_fixup - Describe a fixup to apply to an FDT | |
61 | * @apply: applies the fixup to @fdt, returns zero on success else -errno | |
62 | * @description: a short description of the fixup | |
63 | * | |
64 | * Describes a fixup applied to an FDT blob by the @apply function. The | |
65 | * @description field provides a short description of the fixup intended for | |
66 | * use in error messages if the @apply function returns non-zero. | |
67 | */ | |
68 | struct mips_fdt_fixup { | |
69 | int (*apply)(void *fdt); | |
70 | const char *description; | |
71 | }; | |
72 | ||
73 | /** | |
74 | * apply_mips_fdt_fixups() - apply fixups to an FDT blob | |
75 | * @fdt_out: buffer in which to place the fixed-up FDT | |
76 | * @fdt_out_size: the size of the @fdt_out buffer | |
77 | * @fdt_in: the FDT blob | |
78 | * @fixups: pointer to an array of fixups to be applied | |
79 | * | |
80 | * Loop through the array of fixups pointed to by @fixups, calling the apply | |
81 | * function on each until either one returns an error or we reach the end of | |
82 | * the list as indicated by an entry with a NULL apply field. | |
83 | * | |
84 | * Return: zero on success, else -errno | |
85 | */ | |
86 | extern int __init apply_mips_fdt_fixups(void *fdt_out, size_t fdt_out_size, | |
87 | const void *fdt_in, | |
88 | const struct mips_fdt_fixup *fixups); | |
89 | ||
eed0eabd | 90 | #endif /* __MIPS_ASM_MACHINE_H__ */ |