tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * based on METAG mach/arch.h (which in turn was based on ARM)
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#ifndef _ASM_ARC_MACH_DESC_H_
12#define _ASM_ARC_MACH_DESC_H_
13
14/**
15 * struct machine_desc - Board specific callbacks, called from ARC common code
16 * Provided by each ARC board using MACHINE_START()/MACHINE_END(), so
17 * a multi-platform kernel builds with array of such descriptors.
18 * We extend the early DT scan to also match the DT's "compatible" string
19 * against the @dt_compat of all such descriptors, and one with highest
20 * "DT score" is selected as global @machine_desc.
21 *
22 * @name: Board/SoC name
23 * @dt_compat: Array of device tree 'compatible' strings
24 * (XXX: although only 1st entry is looked at)
25 * @init_early: Very early callback [called from setup_arch()]
26 * @init_irq: setup external IRQ controllers [called from init_IRQ()]
27 * @init_smp: for each CPU (e.g. setup IPI)
28 * [(M):init_IRQ(), (o):start_kernel_secondary()]
29 * @init_time: platform specific clocksource/clockevent registration
30 * [called from time_init()]
31 * @init_machine: arch initcall level callback (e.g. populate static
32 * platform devices or parse Devicetree)
33 * @init_late: Late initcall level callback
34 *
35 */
36struct machine_desc {
37 const char *name;
38 const char **dt_compat;
39
40 void (*init_early)(void);
41 void (*init_irq)(void);
42#ifdef CONFIG_SMP
43 void (*init_smp)(unsigned int);
44#endif
45 void (*init_time)(void);
46 void (*init_machine)(void);
47 void (*init_late)(void);
48
49};
50
51/*
52 * Current machine - only accessible during boot.
53 */
54extern struct machine_desc *machine_desc;
55
56/*
57 * Machine type table - also only accessible during boot
58 */
59extern struct machine_desc __arch_info_begin[], __arch_info_end[];
60#define for_each_machine_desc(p) \
61 for (p = __arch_info_begin; p < __arch_info_end; p++)
62
63static inline struct machine_desc *default_machine_desc(void)
64{
65 /* the default machine is the last one linked in */
66 if (__arch_info_end - 1 < __arch_info_begin)
67 return NULL;
68 return __arch_info_end - 1;
69}
70
71/*
72 * Set of macros to define architecture features.
73 * This is built into a table by the linker.
74 */
75#define MACHINE_START(_type, _name) \
76static const struct machine_desc __mach_desc_##_type \
77__used \
78__attribute__((__section__(".arch.info.init"))) = { \
79 .name = _name,
80
81#define MACHINE_END \
82};
83
84extern struct machine_desc *setup_machine_fdt(void *dt);
85extern void __init copy_devtree(void);
86
87#endif