arch/c6x/platforms/cache.c

   1 /*
   2  *  Copyright (C) 2011 Texas Instruments Incorporated
   3  *  Author: Mark Salter <msalter@redhat.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License version 2 as
   7  *  published by the Free Software Foundation.
   8  */
   9 #include <linux/of.h>
  10 #include <linux/of_address.h>
  11 #include <linux/io.h>
  12
  13 #include <asm/cache.h>
  14 #include <asm/soc.h>
  15
  16 /*
  17  * Internal Memory Control Registers for caches
  18  */
  19 #define IMCR_CCFG         0x0000
  20 #define IMCR_L1PCFG       0x0020
  21 #define IMCR_L1PCC        0x0024
  22 #define IMCR_L1DCFG       0x0040
  23 #define IMCR_L1DCC        0x0044
  24 #define IMCR_L2ALLOC0     0x2000
  25 #define IMCR_L2ALLOC1     0x2004
  26 #define IMCR_L2ALLOC2     0x2008
  27 #define IMCR_L2ALLOC3     0x200c
  28 #define IMCR_L2WBAR       0x4000
  29 #define IMCR_L2WWC        0x4004
  30 #define IMCR_L2WIBAR      0x4010
  31 #define IMCR_L2WIWC       0x4014
  32 #define IMCR_L2IBAR       0x4018
  33 #define IMCR_L2IWC        0x401c
  34 #define IMCR_L1PIBAR      0x4020
  35 #define IMCR_L1PIWC       0x4024
  36 #define IMCR_L1DWIBAR     0x4030
  37 #define IMCR_L1DWIWC      0x4034
  38 #define IMCR_L1DWBAR      0x4040
  39 #define IMCR_L1DWWC       0x4044
  40 #define IMCR_L1DIBAR      0x4048
  41 #define IMCR_L1DIWC       0x404c
  42 #define IMCR_L2WB         0x5000
  43 #define IMCR_L2WBINV      0x5004
  44 #define IMCR_L2INV        0x5008
  45 #define IMCR_L1PINV       0x5028
  46 #define IMCR_L1DWB        0x5040
  47 #define IMCR_L1DWBINV     0x5044
  48 #define IMCR_L1DINV       0x5048
  49 #define IMCR_MAR_BASE     0x8000
  50 #define IMCR_MAR96_111    0x8180
  51 #define IMCR_MAR128_191   0x8200
  52 #define IMCR_MAR224_239   0x8380
  53 #define IMCR_L2MPFAR      0xa000
  54 #define IMCR_L2MPFSR      0xa004
  55 #define IMCR_L2MPFCR      0xa008
  56 #define IMCR_L2MPLK0      0xa100
  57 #define IMCR_L2MPLK1      0xa104
  58 #define IMCR_L2MPLK2      0xa108
  59 #define IMCR_L2MPLK3      0xa10c
  60 #define IMCR_L2MPLKCMD    0xa110
  61 #define IMCR_L2MPLKSTAT   0xa114
  62 #define IMCR_L2MPPA_BASE  0xa200
  63 #define IMCR_L1PMPFAR     0xa400
  64 #define IMCR_L1PMPFSR     0xa404
  65 #define IMCR_L1PMPFCR     0xa408
  66 #define IMCR_L1PMPLK0     0xa500
  67 #define IMCR_L1PMPLK1     0xa504
  68 #define IMCR_L1PMPLK2     0xa508
  69 #define IMCR_L1PMPLK3     0xa50c
  70 #define IMCR_L1PMPLKCMD   0xa510
  71 #define IMCR_L1PMPLKSTAT  0xa514
  72 #define IMCR_L1PMPPA_BASE 0xa600
  73 #define IMCR_L1DMPFAR     0xac00
  74 #define IMCR_L1DMPFSR     0xac04
  75 #define IMCR_L1DMPFCR     0xac08
  76 #define IMCR_L1DMPLK0     0xad00
  77 #define IMCR_L1DMPLK1     0xad04
  78 #define IMCR_L1DMPLK2     0xad08
  79 #define IMCR_L1DMPLK3     0xad0c
  80 #define IMCR_L1DMPLKCMD   0xad10
  81 #define IMCR_L1DMPLKSTAT  0xad14
  82 #define IMCR_L1DMPPA_BASE 0xae00
  83 #define IMCR_L2PDWAKE0    0xc040
  84 #define IMCR_L2PDWAKE1    0xc044
  85 #define IMCR_L2PDSLEEP0   0xc050
  86 #define IMCR_L2PDSLEEP1   0xc054
  87 #define IMCR_L2PDSTAT0    0xc060
  88 #define IMCR_L2PDSTAT1    0xc064
  89
  90 /*
  91  * CCFG register values and bits
  92  */
  93 #define L2MODE_0K_CACHE   0x0
  94 #define L2MODE_32K_CACHE  0x1
  95 #define L2MODE_64K_CACHE  0x2
  96 #define L2MODE_128K_CACHE 0x3
  97 #define L2MODE_256K_CACHE 0x7
  98
  99 #define L2PRIO_URGENT     0x0
 100 #define L2PRIO_HIGH       0x1
 101 #define L2PRIO_MEDIUM     0x2
 102 #define L2PRIO_LOW        0x3
 103
 104 #define CCFG_ID           0x100   /* Invalidate L1P bit */
 105 #define CCFG_IP           0x200   /* Invalidate L1D bit */
 106
 107 static void __iomem *cache_base;
 108
 109 /*
 110  * L1 & L2 caches generic functions
 111  */
 112 #define imcr_get(reg) soc_readl(cache_base + (reg))
 113 #define imcr_set(reg, value) \
 114 do {                                                            \
 115         soc_writel((value), cache_base + (reg));                \
 116         soc_readl(cache_base + (reg));                          \
 117 } while (0)
 118
 119 static void cache_block_operation_wait(unsigned int wc_reg)
 120 {
 121         /* Wait for completion */
 122         while (imcr_get(wc_reg))
 123                 cpu_relax();
 124 }
 125
 126 static DEFINE_SPINLOCK(cache_lock);
 127
 128 /*
 129  * Generic function to perform a block cache operation as
 130  * invalidate or writeback/invalidate
 131  */
 132 static void cache_block_operation(unsigned int *start,
 133                                   unsigned int *end,
 134                                   unsigned int bar_reg,
 135                                   unsigned int wc_reg)
 136 {
 137         unsigned long flags;
 138         unsigned int wcnt =
 139                 (L2_CACHE_ALIGN_CNT((unsigned int) end)
 140                  - L2_CACHE_ALIGN_LOW((unsigned int) start)) >> 2;
 141         unsigned int wc = 0;
 142
 143         for (; wcnt; wcnt -= wc, start += wc) {
 144 loop:
 145                 spin_lock_irqsave(&cache_lock, flags);
 146
 147                 /*
 148                  * If another cache operation is occuring
 149                  */
 150                 if (unlikely(imcr_get(wc_reg))) {
 151                         spin_unlock_irqrestore(&cache_lock, flags);
 152
 153                         /* Wait for previous operation completion */
 154                         cache_block_operation_wait(wc_reg);
 155
 156                         /* Try again */
 157                         goto loop;
 158                 }
 159
 160                 imcr_set(bar_reg, L2_CACHE_ALIGN_LOW((unsigned int) start));
 161
 162                 if (wcnt > 0xffff)
 163                         wc = 0xffff;
 164                 else
 165                         wc = wcnt;
 166
 167                 /* Set word count value in the WC register */
 168                 imcr_set(wc_reg, wc & 0xffff);
 169
 170                 spin_unlock_irqrestore(&cache_lock, flags);
 171
 172                 /* Wait for completion */
 173                 cache_block_operation_wait(wc_reg);
 174         }
 175 }
 176
 177 static void cache_block_operation_nowait(unsigned int *start,
 178                                          unsigned int *end,
 179                                          unsigned int bar_reg,
 180                                          unsigned int wc_reg)
 181 {
 182         unsigned long flags;
 183         unsigned int wcnt =
 184                 (L2_CACHE_ALIGN_CNT((unsigned int) end)
 185                  - L2_CACHE_ALIGN_LOW((unsigned int) start)) >> 2;
 186         unsigned int wc = 0;
 187
 188         for (; wcnt; wcnt -= wc, start += wc) {
 189
 190                 spin_lock_irqsave(&cache_lock, flags);
 191
 192                 imcr_set(bar_reg, L2_CACHE_ALIGN_LOW((unsigned int) start));
 193
 194                 if (wcnt > 0xffff)
 195                         wc = 0xffff;
 196                 else
 197                         wc = wcnt;
 198
 199                 /* Set word count value in the WC register */
 200                 imcr_set(wc_reg, wc & 0xffff);
 201
 202                 spin_unlock_irqrestore(&cache_lock, flags);
 203
 204                 /* Don't wait for completion on last cache operation */
 205                 if (wcnt > 0xffff)
 206                         cache_block_operation_wait(wc_reg);
 207         }
 208 }
 209
 210 /*
 211  * L1 caches management
 212  */
 213
 214 /*
 215  * Disable L1 caches
 216  */
 217 void L1_cache_off(void)
 218 {
 219         unsigned int dummy;
 220
 221         imcr_set(IMCR_L1PCFG, 0);
 222         dummy = imcr_get(IMCR_L1PCFG);
 223
 224         imcr_set(IMCR_L1DCFG, 0);
 225         dummy = imcr_get(IMCR_L1DCFG);
 226 }
 227
 228 /*
 229  * Enable L1 caches
 230  */
 231 void L1_cache_on(void)
 232 {
 233         unsigned int dummy;
 234
 235         imcr_set(IMCR_L1PCFG, 7);
 236         dummy = imcr_get(IMCR_L1PCFG);
 237
 238         imcr_set(IMCR_L1DCFG, 7);
 239         dummy = imcr_get(IMCR_L1DCFG);
 240 }
 241
 242 /*
 243  *  L1P global-invalidate all
 244  */
 245 void L1P_cache_global_invalidate(void)
 246 {
 247         unsigned int set = 1;
 248         imcr_set(IMCR_L1PINV, set);
 249         while (imcr_get(IMCR_L1PINV) & 1)
 250                 cpu_relax();
 251 }
 252
 253 /*
 254  *  L1D global-invalidate all
 255  *
 256  * Warning: this operation causes all updated data in L1D to
 257  * be discarded rather than written back to the lower levels of
 258  * memory
 259  */
 260 void L1D_cache_global_invalidate(void)
 261 {
 262         unsigned int set = 1;
 263         imcr_set(IMCR_L1DINV, set);
 264         while (imcr_get(IMCR_L1DINV) & 1)
 265                 cpu_relax();
 266 }
 267
 268 void L1D_cache_global_writeback(void)
 269 {
 270         unsigned int set = 1;
 271         imcr_set(IMCR_L1DWB, set);
 272         while (imcr_get(IMCR_L1DWB) & 1)
 273                 cpu_relax();
 274 }
 275
 276 void L1D_cache_global_writeback_invalidate(void)
 277 {
 278         unsigned int set = 1;
 279         imcr_set(IMCR_L1DWBINV, set);
 280         while (imcr_get(IMCR_L1DWBINV) & 1)
 281                 cpu_relax();
 282 }
 283
 284 /*
 285  * L2 caches management
 286  */
 287
 288 /*
 289  * Set L2 operation mode
 290  */
 291 void L2_cache_set_mode(unsigned int mode)
 292 {
 293         unsigned int ccfg = imcr_get(IMCR_CCFG);
 294
 295         /* Clear and set the L2MODE bits in CCFG */
 296         ccfg &= ~7;
 297         ccfg |= (mode & 7);
 298         imcr_set(IMCR_CCFG, ccfg);
 299         ccfg = imcr_get(IMCR_CCFG);
 300 }
 301
 302 /*
 303  *  L2 global-writeback and global-invalidate all
 304  */
 305 void L2_cache_global_writeback_invalidate(void)
 306 {
 307         imcr_set(IMCR_L2WBINV, 1);
 308         while (imcr_get(IMCR_L2WBINV))
 309                 cpu_relax();
 310 }
 311
 312 /*
 313  *  L2 global-writeback all
 314  */
 315 void L2_cache_global_writeback(void)
 316 {
 317         imcr_set(IMCR_L2WB, 1);
 318         while (imcr_get(IMCR_L2WB))
 319                 cpu_relax();
 320 }
 321
 322 /*
 323  * Cacheability controls
 324  */
 325 void enable_caching(unsigned long start, unsigned long end)
 326 {
 327         unsigned int mar = IMCR_MAR_BASE + ((start >> 24) << 2);
 328         unsigned int mar_e = IMCR_MAR_BASE + ((end >> 24) << 2);
 329
 330         for (; mar <= mar_e; mar += 4)
 331                 imcr_set(mar, imcr_get(mar) | 1);
 332 }
 333
 334 void disable_caching(unsigned long start, unsigned long end)
 335 {
 336         unsigned int mar = IMCR_MAR_BASE + ((start >> 24) << 2);
 337         unsigned int mar_e = IMCR_MAR_BASE + ((end >> 24) << 2);
 338
 339         for (; mar <= mar_e; mar += 4)
 340                 imcr_set(mar, imcr_get(mar) & ~1);
 341 }
 342
 343
 344 /*
 345  *  L1 block operations
 346  */
 347 void L1P_cache_block_invalidate(unsigned int start, unsigned int end)
 348 {
 349         cache_block_operation((unsigned int *) start,
 350                               (unsigned int *) end,
 351                               IMCR_L1PIBAR, IMCR_L1PIWC);
 352 }
 353 EXPORT_SYMBOL(L1P_cache_block_invalidate);
 354
 355 void L1D_cache_block_invalidate(unsigned int start, unsigned int end)
 356 {
 357         cache_block_operation((unsigned int *) start,
 358                               (unsigned int *) end,
 359                               IMCR_L1DIBAR, IMCR_L1DIWC);
 360 }
 361
 362 void L1D_cache_block_writeback_invalidate(unsigned int start, unsigned int end)
 363 {
 364         cache_block_operation((unsigned int *) start,
 365                               (unsigned int *) end,
 366                               IMCR_L1DWIBAR, IMCR_L1DWIWC);
 367 }
 368
 369 void L1D_cache_block_writeback(unsigned int start, unsigned int end)
 370 {
 371         cache_block_operation((unsigned int *) start,
 372                               (unsigned int *) end,
 373                               IMCR_L1DWBAR, IMCR_L1DWWC);
 374 }
 375 EXPORT_SYMBOL(L1D_cache_block_writeback);
 376
 377 /*
 378  *  L2 block operations
 379  */
 380 void L2_cache_block_invalidate(unsigned int start, unsigned int end)
 381 {
 382         cache_block_operation((unsigned int *) start,
 383                               (unsigned int *) end,
 384                               IMCR_L2IBAR, IMCR_L2IWC);
 385 }
 386
 387 void L2_cache_block_writeback(unsigned int start, unsigned int end)
 388 {
 389         cache_block_operation((unsigned int *) start,
 390                               (unsigned int *) end,
 391                               IMCR_L2WBAR, IMCR_L2WWC);
 392 }
 393
 394 void L2_cache_block_writeback_invalidate(unsigned int start, unsigned int end)
 395 {
 396         cache_block_operation((unsigned int *) start,
 397                               (unsigned int *) end,
 398                               IMCR_L2WIBAR, IMCR_L2WIWC);
 399 }
 400
 401 void L2_cache_block_invalidate_nowait(unsigned int start, unsigned int end)
 402 {
 403         cache_block_operation_nowait((unsigned int *) start,
 404                                      (unsigned int *) end,
 405                                      IMCR_L2IBAR, IMCR_L2IWC);
 406 }
 407
 408 void L2_cache_block_writeback_nowait(unsigned int start, unsigned int end)
 409 {
 410         cache_block_operation_nowait((unsigned int *) start,
 411                                      (unsigned int *) end,
 412                                      IMCR_L2WBAR, IMCR_L2WWC);
 413 }
 414
 415 void L2_cache_block_writeback_invalidate_nowait(unsigned int start,
 416                                                 unsigned int end)
 417 {
 418         cache_block_operation_nowait((unsigned int *) start,
 419                                      (unsigned int *) end,
 420                                      IMCR_L2WIBAR, IMCR_L2WIWC);
 421 }
 422
 423
 424 /*
 425  * L1 and L2 caches configuration
 426  */
 427 void __init c6x_cache_init(void)
 428 {
 429         struct device_node *node;
 430
 431         node = of_find_compatible_node(NULL, NULL, "ti,c64x+cache");
 432         if (!node)
 433                 return;
 434
 435         cache_base = of_iomap(node, 0);
 436
 437         of_node_put(node);
 438
 439         if (!cache_base)
 440                 return;
 441
 442         /* Set L2 caches on the the whole L2 SRAM memory */
 443         L2_cache_set_mode(L2MODE_SIZE);
 444
 445         /* Enable L1 */
 446         L1_cache_on();
 447 }