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 */ 36 struct 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 */ 54 extern struct machine_desc *machine_desc; 55 56 /* 57 * Machine type table - also only accessible during boot 58 */ 59 extern 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 63 static 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) \ 76 static 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 84 extern struct machine_desc *setup_machine_fdt(void *dt); 85 extern void __init copy_devtree(void); 86 87 #endif 88