projects / linux-2.6-block.git / blame
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|---|---|---|
| ab9988a3 PB |
1 | /* |
| 2 | * Copyright (C) 2014 Imagination Technologies | |
| 3 | * Author: Paul Burton <paul.burton@imgtec.com> | |
| 4 | * | |
| 5 | * This program is free software; you can redistribute it and/or modify it | |
| 6 | * under the terms of the GNU General Public License as published by the | |
| 7 | * Free Software Foundation; either version 2 of the License, or (at your | |
| 8 | * option) any later version. | |
| 9 | */ | |
| 10 | ||
| 11 | #ifndef __MIPS_ASM_MIPS_MAAR_H__ | |
| 12 | #define __MIPS_ASM_MIPS_MAAR_H__ | |
| 13 | ||
| 14 | #include <asm/hazards.h> | |
| 15 | #include <asm/mipsregs.h> | |
| 16 | ||
| 17 | /** | |
| 18 | * platform_maar_init() - perform platform-level MAAR configuration | |
| 19 | * @num_pairs: The number of MAAR pairs present in the system. | |
| 20 | * | |
| 21 | * Platforms should implement this function such that it configures as many | |
| 22 | * MAAR pairs as required, from 0 up to the maximum of num_pairs-1, and returns | |
| 23 | * the number that were used. Any further MAARs will be configured to be | |
| 24 | * invalid. The default implementation of this function will simply indicate | |
| 25 | * that it has configured 0 MAAR pairs. | |
| 26 | * | |
| 27 | * Return: The number of MAAR pairs configured. | |
| 28 | */ | |
| 27d8d449 | 29 | unsigned platform_maar_init(unsigned num_pairs); |
| ab9988a3 PB |
30 | |
| 31 | /** | |
| 32 | * write_maar_pair() - write to a pair of MAARs | |
| 33 | * @idx: The index of the pair (ie. use MAARs idx*2 & (idx*2)+1). | |
| 34 | * @lower: The lowest address that the MAAR pair will affect. Must be | |
| 35 | * aligned to a 2^16 byte boundary. | |
| 36 | * @upper: The highest address that the MAAR pair will affect. Must be | |
| 37 | * aligned to one byte before a 2^16 byte boundary. | |
| 38 | * @attrs: The accessibility attributes to program, eg. MIPS_MAAR_S. The | |
| 39 | * MIPS_MAAR_V attribute will automatically be set. | |
| 40 | * | |
| 41 | * Program the pair of MAAR registers specified by idx to apply the attributes | |
| 42 | * specified by attrs to the range of addresses from lower to higher. | |
| 43 | */ | |
| 44 | static inline void write_maar_pair(unsigned idx, phys_addr_t lower, | |
| 45 | phys_addr_t upper, unsigned attrs) | |
| 46 | { | |
| 47 | /* Addresses begin at bit 16, but are shifted right 4 bits */ | |
| 48 | BUG_ON(lower & (0xffff | ~(MIPS_MAAR_ADDR << 4))); | |
| 49 | BUG_ON(((upper & 0xffff) != 0xffff) | |
| 50 | || ((upper & ~0xffffull) & ~(MIPS_MAAR_ADDR << 4))); | |
| 51 | ||
| 52 | /* Automatically set MIPS_MAAR_V */ | |
| 53 | attrs |= MIPS_MAAR_V; | |
| 54 | ||
| 55 | /* Write the upper address & attributes (only MIPS_MAAR_V matters) */ | |
| 56 | write_c0_maari(idx << 1); | |
| 57 | back_to_back_c0_hazard(); | |
| 58 | write_c0_maar(((upper >> 4) & MIPS_MAAR_ADDR) | attrs); | |
| 59 | back_to_back_c0_hazard(); | |
| 60 | ||
| 61 | /* Write the lower address & attributes */ | |
| 62 | write_c0_maari((idx << 1) | 0x1); | |
| 63 | back_to_back_c0_hazard(); | |
| 64 | write_c0_maar((lower >> 4) | attrs); | |
| 65 | back_to_back_c0_hazard(); | |
| 66 | } | |
| 67 | ||
| e060f6ed PB |
68 | /** |
| 69 | * maar_init() - initialise MAARs | |
| 70 | * | |
| 71 | * Performs initialisation of MAARs for the current CPU, making use of the | |
| 72 | * platforms implementation of platform_maar_init where necessary and | |
| 73 | * duplicating the setup it provides on secondary CPUs. | |
| 74 | */ | |
| 75 | extern void maar_init(void); | |
| 76 | ||
| ab9988a3 PB |
77 | /** |
| 78 | * struct maar_config - MAAR configuration data | |
| 79 | * @lower: The lowest address that the MAAR pair will affect. Must be | |
| 80 | * aligned to a 2^16 byte boundary. | |
| 81 | * @upper: The highest address that the MAAR pair will affect. Must be | |
| 82 | * aligned to one byte before a 2^16 byte boundary. | |
| 83 | * @attrs: The accessibility attributes to program, eg. MIPS_MAAR_S. The | |
| 84 | * MIPS_MAAR_V attribute will automatically be set. | |
| 85 | * | |
| 86 | * Describes the configuration of a pair of Memory Accessibility Attribute | |
| 87 | * Registers - applying attributes from attrs to the range of physical | |
| 88 | * addresses from lower to upper inclusive. | |
| 89 | */ | |
| 90 | struct maar_config { | |
| 91 | phys_addr_t lower; | |
| 92 | phys_addr_t upper; | |
| 93 | unsigned attrs; | |
| 94 | }; | |
| 95 | ||
| 96 | /** | |
| 97 | * maar_config() - configure MAARs according to provided data | |
| 98 | * @cfg: Pointer to an array of struct maar_config. | |
| 99 | * @num_cfg: The number of structs in the cfg array. | |
| 100 | * @num_pairs: The number of MAAR pairs present in the system. | |
| 101 | * | |
| 102 | * Configures as many MAARs as are present and specified in the cfg | |
| 103 | * array with the values taken from the cfg array. | |
| 104 | * | |
| 105 | * Return: The number of MAAR pairs configured. | |
| 106 | */ | |
| 107 | static inline unsigned maar_config(const struct maar_config *cfg, | |
| 108 | unsigned num_cfg, unsigned num_pairs) | |
| 109 | { | |
| 110 | unsigned i; | |
| 111 | ||
| 112 | for (i = 0; i < min(num_cfg, num_pairs); i++) | |
| 113 | write_maar_pair(i, cfg[i].lower, cfg[i].upper, cfg[i].attrs); | |
| 114 | ||
| 115 | return i; | |
| 116 | } | |
| 117 | ||
| 118 | #endif /* __MIPS_ASM_MIPS_MAAR_H__ */ |