1 /* 2 * arch/arm/include/asm/outercache.h 3 * 4 * Copyright (C) 2010 ARM Ltd. 5 * Written by Catalin Marinas <catalin.marinas@arm.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 21 #ifndef __ASM_OUTERCACHE_H 22 #define __ASM_OUTERCACHE_H 23 24 #include <linux/types.h> 25 26 struct outer_cache_fns { 27 void (*inv_range)(unsigned long, unsigned long); 28 void (*clean_range)(unsigned long, unsigned long); 29 void (*flush_range)(unsigned long, unsigned long); 30 void (*flush_all)(void); 31 void (*disable)(void); 32 #ifdef CONFIG_OUTER_CACHE_SYNC 33 void (*sync)(void); 34 #endif 35 void (*resume)(void); 36 37 /* This is an ARM L2C thing */ 38 void (*write_sec)(unsigned long, unsigned); 39 }; 40 41 extern struct outer_cache_fns outer_cache; 42 43 #ifdef CONFIG_OUTER_CACHE 44 /** 45 * outer_inv_range - invalidate range of outer cache lines 46 * @start: starting physical address, inclusive 47 * @end: end physical address, exclusive 48 */ 49 static inline void outer_inv_range(phys_addr_t start, phys_addr_t end) 50 { 51 if (outer_cache.inv_range) 52 outer_cache.inv_range(start, end); 53 } 54 55 /** 56 * outer_clean_range - clean dirty outer cache lines 57 * @start: starting physical address, inclusive 58 * @end: end physical address, exclusive 59 */ 60 static inline void outer_clean_range(phys_addr_t start, phys_addr_t end) 61 { 62 if (outer_cache.clean_range) 63 outer_cache.clean_range(start, end); 64 } 65 66 /** 67 * outer_flush_range - clean and invalidate outer cache lines 68 * @start: starting physical address, inclusive 69 * @end: end physical address, exclusive 70 */ 71 static inline void outer_flush_range(phys_addr_t start, phys_addr_t end) 72 { 73 if (outer_cache.flush_range) 74 outer_cache.flush_range(start, end); 75 } 76 77 /** 78 * outer_flush_all - clean and invalidate all cache lines in the outer cache 79 * 80 * Note: depending on implementation, this may not be atomic - it must 81 * only be called with interrupts disabled and no other active outer 82 * cache masters. 83 * 84 * It is intended that this function is only used by implementations 85 * needing to override the outer_cache.disable() method due to security. 86 * (Some implementations perform this as a clean followed by an invalidate.) 87 */ 88 static inline void outer_flush_all(void) 89 { 90 if (outer_cache.flush_all) 91 outer_cache.flush_all(); 92 } 93 94 /** 95 * outer_disable - clean, invalidate and disable the outer cache 96 * 97 * Disable the outer cache, ensuring that any data contained in the outer 98 * cache is pushed out to lower levels of system memory. The note and 99 * conditions above concerning outer_flush_all() applies here. 100 */ 101 extern void outer_disable(void); 102 103 /** 104 * outer_resume - restore the cache configuration and re-enable outer cache 105 * 106 * Restore any configuration that the cache had when previously enabled, 107 * and re-enable the outer cache. 108 */ 109 static inline void outer_resume(void) 110 { 111 if (outer_cache.resume) 112 outer_cache.resume(); 113 } 114 115 #else 116 117 static inline void outer_inv_range(phys_addr_t start, phys_addr_t end) 118 { } 119 static inline void outer_clean_range(phys_addr_t start, phys_addr_t end) 120 { } 121 static inline void outer_flush_range(phys_addr_t start, phys_addr_t end) 122 { } 123 static inline void outer_flush_all(void) { } 124 static inline void outer_disable(void) { } 125 static inline void outer_resume(void) { } 126 127 #endif 128 129 #ifdef CONFIG_OUTER_CACHE_SYNC 130 /** 131 * outer_sync - perform a sync point for outer cache 132 * 133 * Ensure that all outer cache operations are complete and any store 134 * buffers are drained. 135 */ 136 static inline void outer_sync(void) 137 { 138 if (outer_cache.sync) 139 outer_cache.sync(); 140 } 141 #else 142 static inline void outer_sync(void) 143 { } 144 #endif 145 146 #endif /* __ASM_OUTERCACHE_H */ 147