1 /* 2 * arch/metag/include/asm/mach/arch.h 3 * 4 * Copyright (C) 2012 Imagination Technologies Ltd. 5 * 6 * based on the ARM version: 7 * Copyright (C) 2000 Russell King 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #ifndef _METAG_MACH_ARCH_H_ 15 #define _METAG_MACH_ARCH_H_ 16 17 #include <linux/stddef.h> 18 19 #include <asm/clock.h> 20 21 /** 22 * struct machine_desc - Describes a board controlled by a Meta. 23 * @name: Board/SoC name. 24 * @dt_compat: Array of device tree 'compatible' strings. 25 * @clocks: Clock callbacks. 26 * 27 * @nr_irqs: Maximum number of IRQs. 28 * If 0, defaults to NR_IRQS in asm-generic/irq.h. 29 * 30 * @init_early: Early init callback. 31 * @init_irq: IRQ init callback for setting up IRQ controllers. 32 * @init_machine: Arch init callback for setting up devices. 33 * @init_late: Late init callback. 34 * 35 * This structure is provided by each board which can be controlled by a Meta. 36 * It is chosen by matching the compatible strings in the device tree provided 37 * by the bootloader with the strings in @dt_compat, and sets up any aspects of 38 * the machine that aren't configured with device tree (yet). 39 */ 40 struct machine_desc { 41 const char *name; 42 const char **dt_compat; 43 struct meta_clock_desc *clocks; 44 45 unsigned int nr_irqs; 46 47 void (*init_early)(void); 48 void (*init_irq)(void); 49 void (*init_machine)(void); 50 void (*init_late)(void); 51 }; 52 53 /* 54 * Current machine - only accessible during boot. 55 */ 56 extern const struct machine_desc *machine_desc; 57 58 /* 59 * Machine type table - also only accessible during boot 60 */ 61 extern struct machine_desc __arch_info_begin[], __arch_info_end[]; 62 #define for_each_machine_desc(p) \ 63 for (p = __arch_info_begin; p < __arch_info_end; p++) 64 default_machine_desc(void)65static inline struct machine_desc *default_machine_desc(void) 66 { 67 /* the default machine is the last one linked in */ 68 if (__arch_info_end - 1 < __arch_info_begin) 69 return NULL; 70 return __arch_info_end - 1; 71 } 72 73 /* 74 * Set of macros to define architecture features. This is built into 75 * a table by the linker. 76 */ 77 #define MACHINE_START(_type, _name) \ 78 static const struct machine_desc __mach_desc_##_type \ 79 __used \ 80 __attribute__((__section__(".arch.info.init"))) = { \ 81 .name = _name, 82 83 #define MACHINE_END \ 84 }; 85 86 #endif /* _METAG_MACH_ARCH_H_ */ 87