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 l2x0_regs; 27 28 struct outer_cache_fns { 29 void (*inv_range)(unsigned long, unsigned long); 30 void (*clean_range)(unsigned long, unsigned long); 31 void (*flush_range)(unsigned long, unsigned long); 32 void (*flush_all)(void); 33 void (*disable)(void); 34 #ifdef CONFIG_OUTER_CACHE_SYNC 35 void (*sync)(void); 36 #endif 37 void (*resume)(void); 38 39 /* This is an ARM L2C thing */ 40 void (*write_sec)(unsigned long, unsigned); 41 void (*configure)(const struct l2x0_regs *); 42 }; 43 44 extern struct outer_cache_fns outer_cache; 45 46 #ifdef CONFIG_OUTER_CACHE 47 /** 48 * outer_inv_range - invalidate range of outer cache lines 49 * @start: starting physical address, inclusive 50 * @end: end physical address, exclusive 51 */ 52 static inline void outer_inv_range(phys_addr_t start, phys_addr_t end) 53 { 54 if (outer_cache.inv_range) 55 outer_cache.inv_range(start, end); 56 } 57 58 /** 59 * outer_clean_range - clean dirty outer cache lines 60 * @start: starting physical address, inclusive 61 * @end: end physical address, exclusive 62 */ 63 static inline void outer_clean_range(phys_addr_t start, phys_addr_t end) 64 { 65 if (outer_cache.clean_range) 66 outer_cache.clean_range(start, end); 67 } 68 69 /** 70 * outer_flush_range - clean and invalidate outer cache lines 71 * @start: starting physical address, inclusive 72 * @end: end physical address, exclusive 73 */ 74 static inline void outer_flush_range(phys_addr_t start, phys_addr_t end) 75 { 76 if (outer_cache.flush_range) 77 outer_cache.flush_range(start, end); 78 } 79 80 /** 81 * outer_flush_all - clean and invalidate all cache lines in the outer cache 82 * 83 * Note: depending on implementation, this may not be atomic - it must 84 * only be called with interrupts disabled and no other active outer 85 * cache masters. 86 * 87 * It is intended that this function is only used by implementations 88 * needing to override the outer_cache.disable() method due to security. 89 * (Some implementations perform this as a clean followed by an invalidate.) 90 */ 91 static inline void outer_flush_all(void) 92 { 93 if (outer_cache.flush_all) 94 outer_cache.flush_all(); 95 } 96 97 /** 98 * outer_disable - clean, invalidate and disable the outer cache 99 * 100 * Disable the outer cache, ensuring that any data contained in the outer 101 * cache is pushed out to lower levels of system memory. The note and 102 * conditions above concerning outer_flush_all() applies here. 103 */ 104 extern void outer_disable(void); 105 106 /** 107 * outer_resume - restore the cache configuration and re-enable outer cache 108 * 109 * Restore any configuration that the cache had when previously enabled, 110 * and re-enable the outer cache. 111 */ 112 static inline void outer_resume(void) 113 { 114 if (outer_cache.resume) 115 outer_cache.resume(); 116 } 117 118 #else 119 120 static inline void outer_inv_range(phys_addr_t start, phys_addr_t end) 121 { } 122 static inline void outer_clean_range(phys_addr_t start, phys_addr_t end) 123 { } 124 static inline void outer_flush_range(phys_addr_t start, phys_addr_t end) 125 { } 126 static inline void outer_flush_all(void) { } 127 static inline void outer_disable(void) { } 128 static inline void outer_resume(void) { } 129 130 #endif 131 132 #ifdef CONFIG_OUTER_CACHE_SYNC 133 /** 134 * outer_sync - perform a sync point for outer cache 135 * 136 * Ensure that all outer cache operations are complete and any store 137 * buffers are drained. 138 */ 139 static inline void outer_sync(void) 140 { 141 if (outer_cache.sync) 142 outer_cache.sync(); 143 } 144 #else 145 static inline void outer_sync(void) 146 { } 147 #endif 148 149 #endif /* __ASM_OUTERCACHE_H */ 150