Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 1 | /* |
| 2 | * File: arch/blackfin/mach-common/cache.S |
| 3 | * Based on: |
| 4 | * Author: LG Soft India |
| 5 | * |
| 6 | * Created: |
| 7 | * Description: cache control support |
| 8 | * |
| 9 | * Modified: |
| 10 | * Copyright 2004-2006 Analog Devices Inc. |
| 11 | * |
| 12 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * This program is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with this program; if not, see the file COPYING, or write |
| 26 | * to the Free Software Foundation, Inc., |
| 27 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 28 | */ |
| 29 | |
| 30 | #include <linux/linkage.h> |
| 31 | #include <asm/cplb.h> |
| 32 | #include <asm/entry.h> |
| 33 | #include <asm/blackfin.h> |
| 34 | #include <asm/cache.h> |
| 35 | |
| 36 | .text |
| 37 | .align 2 |
| 38 | ENTRY(_cache_invalidate) |
| 39 | |
| 40 | /* |
| 41 | * Icache or DcacheA or DcacheB Invalidation |
| 42 | * or any combination thereof |
| 43 | * R0 has bits |
| 44 | * CPLB_ENABLE_ICACHE_P,CPLB_ENABLE_DCACHE_P,CPLB_ENABLE_DCACHE2_P |
| 45 | * set as required |
| 46 | */ |
| 47 | [--SP] = R7; |
| 48 | |
| 49 | R7 = R0; |
| 50 | CC = BITTST(R7,CPLB_ENABLE_ICACHE_P); |
| 51 | IF !CC JUMP .Lno_icache; |
| 52 | [--SP] = RETS; |
| 53 | CALL _icache_invalidate; |
| 54 | RETS = [SP++]; |
| 55 | .Lno_icache: |
| 56 | CC = BITTST(R7,CPLB_ENABLE_DCACHE_P); |
| 57 | IF !CC JUMP .Lno_dcache_a; |
| 58 | R0 = 0; /* specifies bank A */ |
| 59 | [--SP] = RETS; |
| 60 | CALL _dcache_invalidate; |
| 61 | RETS = [SP++]; |
| 62 | .Lno_dcache_a: |
| 63 | CC = BITTST(R7,CPLB_ENABLE_DCACHE2_P); |
| 64 | IF !CC JUMP .Lno_dcache_b; |
| 65 | R0 = 0; |
| 66 | BITSET(R0, 23); /* specifies bank B */ |
| 67 | [--SP] = RETS; |
| 68 | CALL _dcache_invalidate; |
| 69 | RETS = [SP++]; |
| 70 | .Lno_dcache_b: |
| 71 | R7 = [SP++]; |
| 72 | RTS; |
Mike Frysinger | 51be24c | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 73 | ENDPROC(_cache_invalidate) |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 74 | |
| 75 | /* Invalidate the Entire Instruction cache by |
| 76 | * disabling IMC bit |
| 77 | */ |
| 78 | ENTRY(_icache_invalidate) |
| 79 | ENTRY(_invalidate_entire_icache) |
| 80 | [--SP] = ( R7:5); |
| 81 | |
Mike Frysinger | e208f83 | 2007-07-25 10:11:42 +0800 | [diff] [blame] | 82 | P0.L = LO(IMEM_CONTROL); |
| 83 | P0.H = HI(IMEM_CONTROL); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 84 | R7 = [P0]; |
| 85 | |
| 86 | /* Clear the IMC bit , All valid bits in the instruction |
| 87 | * cache are set to the invalid state |
| 88 | */ |
| 89 | BITCLR(R7,IMC_P); |
| 90 | CLI R6; |
| 91 | SSYNC; /* SSYNC required before invalidating cache. */ |
| 92 | .align 8; |
| 93 | [P0] = R7; |
| 94 | SSYNC; |
| 95 | STI R6; |
| 96 | |
| 97 | /* Configures the instruction cache agian */ |
| 98 | R6 = (IMC | ENICPLB); |
| 99 | R7 = R7 | R6; |
| 100 | |
| 101 | CLI R6; |
| 102 | SSYNC; /* SSYNC required before writing to IMEM_CONTROL. */ |
| 103 | .align 8; |
| 104 | [P0] = R7; |
| 105 | SSYNC; |
| 106 | STI R6; |
| 107 | |
| 108 | ( R7:5) = [SP++]; |
| 109 | RTS; |
Mike Frysinger | 51be24c | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 110 | ENDPROC(_invalidate_entire_icache) |
| 111 | ENDPROC(_icache_invalidate) |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 112 | |
| 113 | /* |
| 114 | * blackfin_cache_flush_range(start, end) |
| 115 | * Invalidate all cache lines assocoiated with this |
| 116 | * area of memory. |
| 117 | * |
| 118 | * start: Start address |
| 119 | * end: End address |
| 120 | */ |
| 121 | ENTRY(_blackfin_icache_flush_range) |
| 122 | R2 = -L1_CACHE_BYTES; |
| 123 | R2 = R0 & R2; |
| 124 | P0 = R2; |
| 125 | P1 = R1; |
Robin Getz | 4bf3f3c | 2007-06-21 11:34:16 +0800 | [diff] [blame] | 126 | CSYNC(R3); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 127 | IFLUSH [P0]; |
| 128 | 1: |
| 129 | IFLUSH [P0++]; |
| 130 | CC = P0 < P1 (iu); |
| 131 | IF CC JUMP 1b (bp); |
| 132 | IFLUSH [P0]; |
Robin Getz | 4bf3f3c | 2007-06-21 11:34:16 +0800 | [diff] [blame] | 133 | SSYNC(R3); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 134 | RTS; |
Mike Frysinger | 51be24c | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 135 | ENDPROC(_blackfin_icache_flush_range) |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 136 | |
| 137 | /* |
| 138 | * blackfin_icache_dcache_flush_range(start, end) |
| 139 | * FLUSH all cache lines assocoiated with this |
| 140 | * area of memory. |
| 141 | * |
| 142 | * start: Start address |
| 143 | * end: End address |
| 144 | */ |
| 145 | |
| 146 | ENTRY(_blackfin_icache_dcache_flush_range) |
| 147 | R2 = -L1_CACHE_BYTES; |
| 148 | R2 = R0 & R2; |
| 149 | P0 = R2; |
| 150 | P1 = R1; |
Robin Getz | 4bf3f3c | 2007-06-21 11:34:16 +0800 | [diff] [blame] | 151 | CSYNC(R3); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 152 | IFLUSH [P0]; |
| 153 | 1: |
| 154 | FLUSH [P0]; |
| 155 | IFLUSH [P0++]; |
| 156 | CC = P0 < P1 (iu); |
| 157 | IF CC JUMP 1b (bp); |
| 158 | IFLUSH [P0]; |
| 159 | FLUSH [P0]; |
Robin Getz | 4bf3f3c | 2007-06-21 11:34:16 +0800 | [diff] [blame] | 160 | SSYNC(R3); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 161 | RTS; |
Mike Frysinger | 51be24c | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 162 | ENDPROC(_blackfin_icache_dcache_flush_range) |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 163 | |
| 164 | /* Throw away all D-cached data in specified region without any obligation to |
| 165 | * write them back. However, we must clean the D-cached entries around the |
| 166 | * boundaries of the start and/or end address is not cache aligned. |
| 167 | * |
| 168 | * Start: start address, |
| 169 | * end : end address. |
| 170 | */ |
| 171 | |
| 172 | ENTRY(_blackfin_dcache_invalidate_range) |
| 173 | R2 = -L1_CACHE_BYTES; |
| 174 | R2 = R0 & R2; |
| 175 | P0 = R2; |
| 176 | P1 = R1; |
Robin Getz | 4bf3f3c | 2007-06-21 11:34:16 +0800 | [diff] [blame] | 177 | CSYNC(R3); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 178 | FLUSHINV[P0]; |
| 179 | 1: |
| 180 | FLUSHINV[P0++]; |
| 181 | CC = P0 < P1 (iu); |
| 182 | IF CC JUMP 1b (bp); |
| 183 | |
| 184 | /* If the data crosses a cache line, then we'll be pointing to |
| 185 | * the last cache line, but won't have flushed/invalidated it yet, |
| 186 | * so do one more. |
| 187 | */ |
| 188 | FLUSHINV[P0]; |
Robin Getz | 4bf3f3c | 2007-06-21 11:34:16 +0800 | [diff] [blame] | 189 | SSYNC(R3); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 190 | RTS; |
Mike Frysinger | 51be24c | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 191 | ENDPROC(_blackfin_dcache_invalidate_range) |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 192 | |
| 193 | /* Invalidate the Entire Data cache by |
| 194 | * clearing DMC[1:0] bits |
| 195 | */ |
| 196 | ENTRY(_invalidate_entire_dcache) |
| 197 | ENTRY(_dcache_invalidate) |
| 198 | [--SP] = ( R7:6); |
| 199 | |
Mike Frysinger | e208f83 | 2007-07-25 10:11:42 +0800 | [diff] [blame] | 200 | P0.L = LO(DMEM_CONTROL); |
| 201 | P0.H = HI(DMEM_CONTROL); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 202 | R7 = [P0]; |
| 203 | |
| 204 | /* Clear the DMC[1:0] bits, All valid bits in the data |
| 205 | * cache are set to the invalid state |
| 206 | */ |
| 207 | BITCLR(R7,DMC0_P); |
| 208 | BITCLR(R7,DMC1_P); |
| 209 | CLI R6; |
| 210 | SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */ |
| 211 | .align 8; |
| 212 | [P0] = R7; |
| 213 | SSYNC; |
| 214 | STI R6; |
| 215 | |
| 216 | /* Configures the data cache again */ |
| 217 | |
| 218 | R6 = DMEM_CNTR; |
| 219 | R7 = R7 | R6; |
| 220 | |
| 221 | CLI R6; |
| 222 | SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */ |
| 223 | .align 8; |
| 224 | [P0] = R7; |
| 225 | SSYNC; |
| 226 | STI R6; |
| 227 | |
| 228 | ( R7:6) = [SP++]; |
| 229 | RTS; |
Mike Frysinger | 51be24c | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 230 | ENDPROC(_dcache_invalidate) |
| 231 | ENDPROC(_invalidate_entire_dcache) |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 232 | |
| 233 | ENTRY(_blackfin_dcache_flush_range) |
| 234 | R2 = -L1_CACHE_BYTES; |
| 235 | R2 = R0 & R2; |
| 236 | P0 = R2; |
| 237 | P1 = R1; |
Robin Getz | 4bf3f3c | 2007-06-21 11:34:16 +0800 | [diff] [blame] | 238 | CSYNC(R3); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 239 | FLUSH[P0]; |
| 240 | 1: |
| 241 | FLUSH[P0++]; |
| 242 | CC = P0 < P1 (iu); |
| 243 | IF CC JUMP 1b (bp); |
| 244 | |
| 245 | /* If the data crosses a cache line, then we'll be pointing to |
| 246 | * the last cache line, but won't have flushed it yet, so do |
| 247 | * one more. |
| 248 | */ |
| 249 | FLUSH[P0]; |
Robin Getz | 4bf3f3c | 2007-06-21 11:34:16 +0800 | [diff] [blame] | 250 | SSYNC(R3); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 251 | RTS; |
Mike Frysinger | 51be24c | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 252 | ENDPROC(_blackfin_dcache_flush_range) |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 253 | |
| 254 | ENTRY(_blackfin_dflush_page) |
| 255 | P1 = 1 << (PAGE_SHIFT - L1_CACHE_SHIFT); |
| 256 | P0 = R0; |
Robin Getz | 4bf3f3c | 2007-06-21 11:34:16 +0800 | [diff] [blame] | 257 | CSYNC(R3); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 258 | FLUSH[P0]; |
| 259 | LSETUP (.Lfl1, .Lfl1) LC0 = P1; |
| 260 | .Lfl1: FLUSH [P0++]; |
Robin Getz | 4bf3f3c | 2007-06-21 11:34:16 +0800 | [diff] [blame] | 261 | SSYNC(R3); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 262 | RTS; |
Mike Frysinger | 51be24c | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 263 | ENDPROC(_blackfin_dflush_page) |