1 /* 2 * arch/arm/mm/cache-l2x0.c - L210/L220/L310 cache controller support 3 * 4 * Copyright (C) 2007 ARM Limited 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 #include <linux/cpu.h> 20 #include <linux/err.h> 21 #include <linux/init.h> 22 #include <linux/smp.h> 23 #include <linux/spinlock.h> 24 #include <linux/log2.h> 25 #include <linux/io.h> 26 #include <linux/of.h> 27 #include <linux/of_address.h> 28 29 #include <asm/cacheflush.h> 30 #include <asm/cp15.h> 31 #include <asm/cputype.h> 32 #include <asm/hardware/cache-l2x0.h> 33 #include "cache-tauros3.h" 34 #include "cache-aurora-l2.h" 35 36 struct l2c_init_data { 37 const char *type; 38 unsigned way_size_0; 39 unsigned num_lock; 40 void (*of_parse)(const struct device_node *, u32 *, u32 *); 41 void (*enable)(void __iomem *, u32, unsigned); 42 void (*fixup)(void __iomem *, u32, struct outer_cache_fns *); 43 void (*save)(void __iomem *); 44 void (*configure)(void __iomem *); 45 struct outer_cache_fns outer_cache; 46 }; 47 48 #define CACHE_LINE_SIZE 32 49 50 static void __iomem *l2x0_base; 51 static const struct l2c_init_data *l2x0_data; 52 static DEFINE_RAW_SPINLOCK(l2x0_lock); 53 static u32 l2x0_way_mask; /* Bitmask of active ways */ 54 static u32 l2x0_size; 55 static unsigned long sync_reg_offset = L2X0_CACHE_SYNC; 56 57 struct l2x0_regs l2x0_saved_regs; 58 59 /* 60 * Common code for all cache controllers. 61 */ 62 static inline void l2c_wait_mask(void __iomem *reg, unsigned long mask) 63 { 64 /* wait for cache operation by line or way to complete */ 65 while (readl_relaxed(reg) & mask) 66 cpu_relax(); 67 } 68 69 /* 70 * By default, we write directly to secure registers. Platforms must 71 * override this if they are running non-secure. 72 */ 73 static void l2c_write_sec(unsigned long val, void __iomem *base, unsigned reg) 74 { 75 if (val == readl_relaxed(base + reg)) 76 return; 77 if (outer_cache.write_sec) 78 outer_cache.write_sec(val, reg); 79 else 80 writel_relaxed(val, base + reg); 81 } 82 83 /* 84 * This should only be called when we have a requirement that the 85 * register be written due to a work-around, as platforms running 86 * in non-secure mode may not be able to access this register. 87 */ 88 static inline void l2c_set_debug(void __iomem *base, unsigned long val) 89 { 90 l2c_write_sec(val, base, L2X0_DEBUG_CTRL); 91 } 92 93 static void __l2c_op_way(void __iomem *reg) 94 { 95 writel_relaxed(l2x0_way_mask, reg); 96 l2c_wait_mask(reg, l2x0_way_mask); 97 } 98 99 static inline void l2c_unlock(void __iomem *base, unsigned num) 100 { 101 unsigned i; 102 103 for (i = 0; i < num; i++) { 104 writel_relaxed(0, base + L2X0_LOCKDOWN_WAY_D_BASE + 105 i * L2X0_LOCKDOWN_STRIDE); 106 writel_relaxed(0, base + L2X0_LOCKDOWN_WAY_I_BASE + 107 i * L2X0_LOCKDOWN_STRIDE); 108 } 109 } 110 111 static void l2c_configure(void __iomem *base) 112 { 113 if (outer_cache.configure) { 114 outer_cache.configure(&l2x0_saved_regs); 115 return; 116 } 117 118 if (l2x0_data->configure) 119 l2x0_data->configure(base); 120 121 l2c_write_sec(l2x0_saved_regs.aux_ctrl, base, L2X0_AUX_CTRL); 122 } 123 124 /* 125 * Enable the L2 cache controller. This function must only be 126 * called when the cache controller is known to be disabled. 127 */ 128 static void l2c_enable(void __iomem *base, u32 aux, unsigned num_lock) 129 { 130 unsigned long flags; 131 132 /* Do not touch the controller if already enabled. */ 133 if (readl_relaxed(base + L2X0_CTRL) & L2X0_CTRL_EN) 134 return; 135 136 l2x0_saved_regs.aux_ctrl = aux; 137 l2c_configure(base); 138 139 l2c_unlock(base, num_lock); 140 141 local_irq_save(flags); 142 __l2c_op_way(base + L2X0_INV_WAY); 143 writel_relaxed(0, base + sync_reg_offset); 144 l2c_wait_mask(base + sync_reg_offset, 1); 145 local_irq_restore(flags); 146 147 l2c_write_sec(L2X0_CTRL_EN, base, L2X0_CTRL); 148 } 149 150 static void l2c_disable(void) 151 { 152 void __iomem *base = l2x0_base; 153 154 outer_cache.flush_all(); 155 l2c_write_sec(0, base, L2X0_CTRL); 156 dsb(st); 157 } 158 159 static void l2c_save(void __iomem *base) 160 { 161 l2x0_saved_regs.aux_ctrl = readl_relaxed(l2x0_base + L2X0_AUX_CTRL); 162 } 163 164 static void l2c_resume(void) 165 { 166 l2c_enable(l2x0_base, l2x0_saved_regs.aux_ctrl, l2x0_data->num_lock); 167 } 168 169 /* 170 * L2C-210 specific code. 171 * 172 * The L2C-2x0 PA, set/way and sync operations are atomic, but we must 173 * ensure that no background operation is running. The way operations 174 * are all background tasks. 175 * 176 * While a background operation is in progress, any new operation is 177 * ignored (unspecified whether this causes an error.) Thankfully, not 178 * used on SMP. 179 * 180 * Never has a different sync register other than L2X0_CACHE_SYNC, but 181 * we use sync_reg_offset here so we can share some of this with L2C-310. 182 */ 183 static void __l2c210_cache_sync(void __iomem *base) 184 { 185 writel_relaxed(0, base + sync_reg_offset); 186 } 187 188 static void __l2c210_op_pa_range(void __iomem *reg, unsigned long start, 189 unsigned long end) 190 { 191 while (start < end) { 192 writel_relaxed(start, reg); 193 start += CACHE_LINE_SIZE; 194 } 195 } 196 197 static void l2c210_inv_range(unsigned long start, unsigned long end) 198 { 199 void __iomem *base = l2x0_base; 200 201 if (start & (CACHE_LINE_SIZE - 1)) { 202 start &= ~(CACHE_LINE_SIZE - 1); 203 writel_relaxed(start, base + L2X0_CLEAN_INV_LINE_PA); 204 start += CACHE_LINE_SIZE; 205 } 206 207 if (end & (CACHE_LINE_SIZE - 1)) { 208 end &= ~(CACHE_LINE_SIZE - 1); 209 writel_relaxed(end, base + L2X0_CLEAN_INV_LINE_PA); 210 } 211 212 __l2c210_op_pa_range(base + L2X0_INV_LINE_PA, start, end); 213 __l2c210_cache_sync(base); 214 } 215 216 static void l2c210_clean_range(unsigned long start, unsigned long end) 217 { 218 void __iomem *base = l2x0_base; 219 220 start &= ~(CACHE_LINE_SIZE - 1); 221 __l2c210_op_pa_range(base + L2X0_CLEAN_LINE_PA, start, end); 222 __l2c210_cache_sync(base); 223 } 224 225 static void l2c210_flush_range(unsigned long start, unsigned long end) 226 { 227 void __iomem *base = l2x0_base; 228 229 start &= ~(CACHE_LINE_SIZE - 1); 230 __l2c210_op_pa_range(base + L2X0_CLEAN_INV_LINE_PA, start, end); 231 __l2c210_cache_sync(base); 232 } 233 234 static void l2c210_flush_all(void) 235 { 236 void __iomem *base = l2x0_base; 237 238 BUG_ON(!irqs_disabled()); 239 240 __l2c_op_way(base + L2X0_CLEAN_INV_WAY); 241 __l2c210_cache_sync(base); 242 } 243 244 static void l2c210_sync(void) 245 { 246 __l2c210_cache_sync(l2x0_base); 247 } 248 249 static const struct l2c_init_data l2c210_data __initconst = { 250 .type = "L2C-210", 251 .way_size_0 = SZ_8K, 252 .num_lock = 1, 253 .enable = l2c_enable, 254 .save = l2c_save, 255 .outer_cache = { 256 .inv_range = l2c210_inv_range, 257 .clean_range = l2c210_clean_range, 258 .flush_range = l2c210_flush_range, 259 .flush_all = l2c210_flush_all, 260 .disable = l2c_disable, 261 .sync = l2c210_sync, 262 .resume = l2c_resume, 263 }, 264 }; 265 266 /* 267 * L2C-220 specific code. 268 * 269 * All operations are background operations: they have to be waited for. 270 * Conflicting requests generate a slave error (which will cause an 271 * imprecise abort.) Never uses sync_reg_offset, so we hard-code the 272 * sync register here. 273 * 274 * However, we can re-use the l2c210_resume call. 275 */ 276 static inline void __l2c220_cache_sync(void __iomem *base) 277 { 278 writel_relaxed(0, base + L2X0_CACHE_SYNC); 279 l2c_wait_mask(base + L2X0_CACHE_SYNC, 1); 280 } 281 282 static void l2c220_op_way(void __iomem *base, unsigned reg) 283 { 284 unsigned long flags; 285 286 raw_spin_lock_irqsave(&l2x0_lock, flags); 287 __l2c_op_way(base + reg); 288 __l2c220_cache_sync(base); 289 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 290 } 291 292 static unsigned long l2c220_op_pa_range(void __iomem *reg, unsigned long start, 293 unsigned long end, unsigned long flags) 294 { 295 raw_spinlock_t *lock = &l2x0_lock; 296 297 while (start < end) { 298 unsigned long blk_end = start + min(end - start, 4096UL); 299 300 while (start < blk_end) { 301 l2c_wait_mask(reg, 1); 302 writel_relaxed(start, reg); 303 start += CACHE_LINE_SIZE; 304 } 305 306 if (blk_end < end) { 307 raw_spin_unlock_irqrestore(lock, flags); 308 raw_spin_lock_irqsave(lock, flags); 309 } 310 } 311 312 return flags; 313 } 314 315 static void l2c220_inv_range(unsigned long start, unsigned long end) 316 { 317 void __iomem *base = l2x0_base; 318 unsigned long flags; 319 320 raw_spin_lock_irqsave(&l2x0_lock, flags); 321 if ((start | end) & (CACHE_LINE_SIZE - 1)) { 322 if (start & (CACHE_LINE_SIZE - 1)) { 323 start &= ~(CACHE_LINE_SIZE - 1); 324 writel_relaxed(start, base + L2X0_CLEAN_INV_LINE_PA); 325 start += CACHE_LINE_SIZE; 326 } 327 328 if (end & (CACHE_LINE_SIZE - 1)) { 329 end &= ~(CACHE_LINE_SIZE - 1); 330 l2c_wait_mask(base + L2X0_CLEAN_INV_LINE_PA, 1); 331 writel_relaxed(end, base + L2X0_CLEAN_INV_LINE_PA); 332 } 333 } 334 335 flags = l2c220_op_pa_range(base + L2X0_INV_LINE_PA, 336 start, end, flags); 337 l2c_wait_mask(base + L2X0_INV_LINE_PA, 1); 338 __l2c220_cache_sync(base); 339 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 340 } 341 342 static void l2c220_clean_range(unsigned long start, unsigned long end) 343 { 344 void __iomem *base = l2x0_base; 345 unsigned long flags; 346 347 start &= ~(CACHE_LINE_SIZE - 1); 348 if ((end - start) >= l2x0_size) { 349 l2c220_op_way(base, L2X0_CLEAN_WAY); 350 return; 351 } 352 353 raw_spin_lock_irqsave(&l2x0_lock, flags); 354 flags = l2c220_op_pa_range(base + L2X0_CLEAN_LINE_PA, 355 start, end, flags); 356 l2c_wait_mask(base + L2X0_CLEAN_INV_LINE_PA, 1); 357 __l2c220_cache_sync(base); 358 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 359 } 360 361 static void l2c220_flush_range(unsigned long start, unsigned long end) 362 { 363 void __iomem *base = l2x0_base; 364 unsigned long flags; 365 366 start &= ~(CACHE_LINE_SIZE - 1); 367 if ((end - start) >= l2x0_size) { 368 l2c220_op_way(base, L2X0_CLEAN_INV_WAY); 369 return; 370 } 371 372 raw_spin_lock_irqsave(&l2x0_lock, flags); 373 flags = l2c220_op_pa_range(base + L2X0_CLEAN_INV_LINE_PA, 374 start, end, flags); 375 l2c_wait_mask(base + L2X0_CLEAN_INV_LINE_PA, 1); 376 __l2c220_cache_sync(base); 377 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 378 } 379 380 static void l2c220_flush_all(void) 381 { 382 l2c220_op_way(l2x0_base, L2X0_CLEAN_INV_WAY); 383 } 384 385 static void l2c220_sync(void) 386 { 387 unsigned long flags; 388 389 raw_spin_lock_irqsave(&l2x0_lock, flags); 390 __l2c220_cache_sync(l2x0_base); 391 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 392 } 393 394 static void l2c220_enable(void __iomem *base, u32 aux, unsigned num_lock) 395 { 396 /* 397 * Always enable non-secure access to the lockdown registers - 398 * we write to them as part of the L2C enable sequence so they 399 * need to be accessible. 400 */ 401 aux |= L220_AUX_CTRL_NS_LOCKDOWN; 402 403 l2c_enable(base, aux, num_lock); 404 } 405 406 static const struct l2c_init_data l2c220_data = { 407 .type = "L2C-220", 408 .way_size_0 = SZ_8K, 409 .num_lock = 1, 410 .enable = l2c220_enable, 411 .save = l2c_save, 412 .outer_cache = { 413 .inv_range = l2c220_inv_range, 414 .clean_range = l2c220_clean_range, 415 .flush_range = l2c220_flush_range, 416 .flush_all = l2c220_flush_all, 417 .disable = l2c_disable, 418 .sync = l2c220_sync, 419 .resume = l2c_resume, 420 }, 421 }; 422 423 /* 424 * L2C-310 specific code. 425 * 426 * Very similar to L2C-210, the PA, set/way and sync operations are atomic, 427 * and the way operations are all background tasks. However, issuing an 428 * operation while a background operation is in progress results in a 429 * SLVERR response. We can reuse: 430 * 431 * __l2c210_cache_sync (using sync_reg_offset) 432 * l2c210_sync 433 * l2c210_inv_range (if 588369 is not applicable) 434 * l2c210_clean_range 435 * l2c210_flush_range (if 588369 is not applicable) 436 * l2c210_flush_all (if 727915 is not applicable) 437 * 438 * Errata: 439 * 588369: PL310 R0P0->R1P0, fixed R2P0. 440 * Affects: all clean+invalidate operations 441 * clean and invalidate skips the invalidate step, so we need to issue 442 * separate operations. We also require the above debug workaround 443 * enclosing this code fragment on affected parts. On unaffected parts, 444 * we must not use this workaround without the debug register writes 445 * to avoid exposing a problem similar to 727915. 446 * 447 * 727915: PL310 R2P0->R3P0, fixed R3P1. 448 * Affects: clean+invalidate by way 449 * clean and invalidate by way runs in the background, and a store can 450 * hit the line between the clean operation and invalidate operation, 451 * resulting in the store being lost. 452 * 453 * 752271: PL310 R3P0->R3P1-50REL0, fixed R3P2. 454 * Affects: 8x64-bit (double fill) line fetches 455 * double fill line fetches can fail to cause dirty data to be evicted 456 * from the cache before the new data overwrites the second line. 457 * 458 * 753970: PL310 R3P0, fixed R3P1. 459 * Affects: sync 460 * prevents merging writes after the sync operation, until another L2C 461 * operation is performed (or a number of other conditions.) 462 * 463 * 769419: PL310 R0P0->R3P1, fixed R3P2. 464 * Affects: store buffer 465 * store buffer is not automatically drained. 466 */ 467 static void l2c310_inv_range_erratum(unsigned long start, unsigned long end) 468 { 469 void __iomem *base = l2x0_base; 470 471 if ((start | end) & (CACHE_LINE_SIZE - 1)) { 472 unsigned long flags; 473 474 /* Erratum 588369 for both clean+invalidate operations */ 475 raw_spin_lock_irqsave(&l2x0_lock, flags); 476 l2c_set_debug(base, 0x03); 477 478 if (start & (CACHE_LINE_SIZE - 1)) { 479 start &= ~(CACHE_LINE_SIZE - 1); 480 writel_relaxed(start, base + L2X0_CLEAN_LINE_PA); 481 writel_relaxed(start, base + L2X0_INV_LINE_PA); 482 start += CACHE_LINE_SIZE; 483 } 484 485 if (end & (CACHE_LINE_SIZE - 1)) { 486 end &= ~(CACHE_LINE_SIZE - 1); 487 writel_relaxed(end, base + L2X0_CLEAN_LINE_PA); 488 writel_relaxed(end, base + L2X0_INV_LINE_PA); 489 } 490 491 l2c_set_debug(base, 0x00); 492 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 493 } 494 495 __l2c210_op_pa_range(base + L2X0_INV_LINE_PA, start, end); 496 __l2c210_cache_sync(base); 497 } 498 499 static void l2c310_flush_range_erratum(unsigned long start, unsigned long end) 500 { 501 raw_spinlock_t *lock = &l2x0_lock; 502 unsigned long flags; 503 void __iomem *base = l2x0_base; 504 505 raw_spin_lock_irqsave(lock, flags); 506 while (start < end) { 507 unsigned long blk_end = start + min(end - start, 4096UL); 508 509 l2c_set_debug(base, 0x03); 510 while (start < blk_end) { 511 writel_relaxed(start, base + L2X0_CLEAN_LINE_PA); 512 writel_relaxed(start, base + L2X0_INV_LINE_PA); 513 start += CACHE_LINE_SIZE; 514 } 515 l2c_set_debug(base, 0x00); 516 517 if (blk_end < end) { 518 raw_spin_unlock_irqrestore(lock, flags); 519 raw_spin_lock_irqsave(lock, flags); 520 } 521 } 522 raw_spin_unlock_irqrestore(lock, flags); 523 __l2c210_cache_sync(base); 524 } 525 526 static void l2c310_flush_all_erratum(void) 527 { 528 void __iomem *base = l2x0_base; 529 unsigned long flags; 530 531 raw_spin_lock_irqsave(&l2x0_lock, flags); 532 l2c_set_debug(base, 0x03); 533 __l2c_op_way(base + L2X0_CLEAN_INV_WAY); 534 l2c_set_debug(base, 0x00); 535 __l2c210_cache_sync(base); 536 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 537 } 538 539 static void __init l2c310_save(void __iomem *base) 540 { 541 unsigned revision; 542 543 l2c_save(base); 544 545 l2x0_saved_regs.tag_latency = readl_relaxed(base + 546 L310_TAG_LATENCY_CTRL); 547 l2x0_saved_regs.data_latency = readl_relaxed(base + 548 L310_DATA_LATENCY_CTRL); 549 l2x0_saved_regs.filter_end = readl_relaxed(base + 550 L310_ADDR_FILTER_END); 551 l2x0_saved_regs.filter_start = readl_relaxed(base + 552 L310_ADDR_FILTER_START); 553 554 revision = readl_relaxed(base + L2X0_CACHE_ID) & 555 L2X0_CACHE_ID_RTL_MASK; 556 557 /* From r2p0, there is Prefetch offset/control register */ 558 if (revision >= L310_CACHE_ID_RTL_R2P0) 559 l2x0_saved_regs.prefetch_ctrl = readl_relaxed(base + 560 L310_PREFETCH_CTRL); 561 562 /* From r3p0, there is Power control register */ 563 if (revision >= L310_CACHE_ID_RTL_R3P0) 564 l2x0_saved_regs.pwr_ctrl = readl_relaxed(base + 565 L310_POWER_CTRL); 566 } 567 568 static void l2c310_configure(void __iomem *base) 569 { 570 unsigned revision; 571 572 /* restore pl310 setup */ 573 l2c_write_sec(l2x0_saved_regs.tag_latency, base, 574 L310_TAG_LATENCY_CTRL); 575 l2c_write_sec(l2x0_saved_regs.data_latency, base, 576 L310_DATA_LATENCY_CTRL); 577 l2c_write_sec(l2x0_saved_regs.filter_end, base, 578 L310_ADDR_FILTER_END); 579 l2c_write_sec(l2x0_saved_regs.filter_start, base, 580 L310_ADDR_FILTER_START); 581 582 revision = readl_relaxed(base + L2X0_CACHE_ID) & 583 L2X0_CACHE_ID_RTL_MASK; 584 585 if (revision >= L310_CACHE_ID_RTL_R2P0) 586 l2c_write_sec(l2x0_saved_regs.prefetch_ctrl, base, 587 L310_PREFETCH_CTRL); 588 if (revision >= L310_CACHE_ID_RTL_R3P0) 589 l2c_write_sec(l2x0_saved_regs.pwr_ctrl, base, 590 L310_POWER_CTRL); 591 } 592 593 static int l2c310_cpu_enable_flz(struct notifier_block *nb, unsigned long act, void *data) 594 { 595 switch (act & ~CPU_TASKS_FROZEN) { 596 case CPU_STARTING: 597 set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1)); 598 break; 599 case CPU_DYING: 600 set_auxcr(get_auxcr() & ~(BIT(3) | BIT(2) | BIT(1))); 601 break; 602 } 603 return NOTIFY_OK; 604 } 605 606 static void __init l2c310_enable(void __iomem *base, u32 aux, unsigned num_lock) 607 { 608 unsigned rev = readl_relaxed(base + L2X0_CACHE_ID) & L2X0_CACHE_ID_RTL_MASK; 609 bool cortex_a9 = read_cpuid_part() == ARM_CPU_PART_CORTEX_A9; 610 611 if (rev >= L310_CACHE_ID_RTL_R2P0) { 612 if (cortex_a9) { 613 aux |= L310_AUX_CTRL_EARLY_BRESP; 614 pr_info("L2C-310 enabling early BRESP for Cortex-A9\n"); 615 } else if (aux & L310_AUX_CTRL_EARLY_BRESP) { 616 pr_warn("L2C-310 early BRESP only supported with Cortex-A9\n"); 617 aux &= ~L310_AUX_CTRL_EARLY_BRESP; 618 } 619 } 620 621 if (cortex_a9) { 622 u32 aux_cur = readl_relaxed(base + L2X0_AUX_CTRL); 623 u32 acr = get_auxcr(); 624 625 pr_debug("Cortex-A9 ACR=0x%08x\n", acr); 626 627 if (acr & BIT(3) && !(aux_cur & L310_AUX_CTRL_FULL_LINE_ZERO)) 628 pr_err("L2C-310: full line of zeros enabled in Cortex-A9 but not L2C-310 - invalid\n"); 629 630 if (aux & L310_AUX_CTRL_FULL_LINE_ZERO && !(acr & BIT(3))) 631 pr_err("L2C-310: enabling full line of zeros but not enabled in Cortex-A9\n"); 632 633 if (!(aux & L310_AUX_CTRL_FULL_LINE_ZERO) && !outer_cache.write_sec) { 634 aux |= L310_AUX_CTRL_FULL_LINE_ZERO; 635 pr_info("L2C-310 full line of zeros enabled for Cortex-A9\n"); 636 } 637 } else if (aux & (L310_AUX_CTRL_FULL_LINE_ZERO | L310_AUX_CTRL_EARLY_BRESP)) { 638 pr_err("L2C-310: disabling Cortex-A9 specific feature bits\n"); 639 aux &= ~(L310_AUX_CTRL_FULL_LINE_ZERO | L310_AUX_CTRL_EARLY_BRESP); 640 } 641 642 /* r3p0 or later has power control register */ 643 if (rev >= L310_CACHE_ID_RTL_R3P0) 644 l2x0_saved_regs.pwr_ctrl = L310_DYNAMIC_CLK_GATING_EN | 645 L310_STNDBY_MODE_EN; 646 647 /* 648 * Always enable non-secure access to the lockdown registers - 649 * we write to them as part of the L2C enable sequence so they 650 * need to be accessible. 651 */ 652 aux |= L310_AUX_CTRL_NS_LOCKDOWN; 653 654 l2c_enable(base, aux, num_lock); 655 656 /* Read back resulting AUX_CTRL value as it could have been altered. */ 657 aux = readl_relaxed(base + L2X0_AUX_CTRL); 658 659 if (aux & (L310_AUX_CTRL_DATA_PREFETCH | L310_AUX_CTRL_INSTR_PREFETCH)) { 660 u32 prefetch = readl_relaxed(base + L310_PREFETCH_CTRL); 661 662 pr_info("L2C-310 %s%s prefetch enabled, offset %u lines\n", 663 aux & L310_AUX_CTRL_INSTR_PREFETCH ? "I" : "", 664 aux & L310_AUX_CTRL_DATA_PREFETCH ? "D" : "", 665 1 + (prefetch & L310_PREFETCH_CTRL_OFFSET_MASK)); 666 } 667 668 /* r3p0 or later has power control register */ 669 if (rev >= L310_CACHE_ID_RTL_R3P0) { 670 u32 power_ctrl; 671 672 power_ctrl = readl_relaxed(base + L310_POWER_CTRL); 673 pr_info("L2C-310 dynamic clock gating %sabled, standby mode %sabled\n", 674 power_ctrl & L310_DYNAMIC_CLK_GATING_EN ? "en" : "dis", 675 power_ctrl & L310_STNDBY_MODE_EN ? "en" : "dis"); 676 } 677 678 if (aux & L310_AUX_CTRL_FULL_LINE_ZERO) { 679 set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1)); 680 cpu_notifier(l2c310_cpu_enable_flz, 0); 681 } 682 } 683 684 static void __init l2c310_fixup(void __iomem *base, u32 cache_id, 685 struct outer_cache_fns *fns) 686 { 687 unsigned revision = cache_id & L2X0_CACHE_ID_RTL_MASK; 688 const char *errata[8]; 689 unsigned n = 0; 690 691 if (IS_ENABLED(CONFIG_PL310_ERRATA_588369) && 692 revision < L310_CACHE_ID_RTL_R2P0 && 693 /* For bcm compatibility */ 694 fns->inv_range == l2c210_inv_range) { 695 fns->inv_range = l2c310_inv_range_erratum; 696 fns->flush_range = l2c310_flush_range_erratum; 697 errata[n++] = "588369"; 698 } 699 700 if (IS_ENABLED(CONFIG_PL310_ERRATA_727915) && 701 revision >= L310_CACHE_ID_RTL_R2P0 && 702 revision < L310_CACHE_ID_RTL_R3P1) { 703 fns->flush_all = l2c310_flush_all_erratum; 704 errata[n++] = "727915"; 705 } 706 707 if (revision >= L310_CACHE_ID_RTL_R3P0 && 708 revision < L310_CACHE_ID_RTL_R3P2) { 709 u32 val = l2x0_saved_regs.prefetch_ctrl; 710 /* I don't think bit23 is required here... but iMX6 does so */ 711 if (val & (BIT(30) | BIT(23))) { 712 val &= ~(BIT(30) | BIT(23)); 713 l2x0_saved_regs.prefetch_ctrl = val; 714 errata[n++] = "752271"; 715 } 716 } 717 718 if (IS_ENABLED(CONFIG_PL310_ERRATA_753970) && 719 revision == L310_CACHE_ID_RTL_R3P0) { 720 sync_reg_offset = L2X0_DUMMY_REG; 721 errata[n++] = "753970"; 722 } 723 724 if (IS_ENABLED(CONFIG_PL310_ERRATA_769419)) 725 errata[n++] = "769419"; 726 727 if (n) { 728 unsigned i; 729 730 pr_info("L2C-310 errat%s", n > 1 ? "a" : "um"); 731 for (i = 0; i < n; i++) 732 pr_cont(" %s", errata[i]); 733 pr_cont(" enabled\n"); 734 } 735 } 736 737 static void l2c310_disable(void) 738 { 739 /* 740 * If full-line-of-zeros is enabled, we must first disable it in the 741 * Cortex-A9 auxiliary control register before disabling the L2 cache. 742 */ 743 if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_FULL_LINE_ZERO) 744 set_auxcr(get_auxcr() & ~(BIT(3) | BIT(2) | BIT(1))); 745 746 l2c_disable(); 747 } 748 749 static void l2c310_resume(void) 750 { 751 l2c_resume(); 752 753 /* Re-enable full-line-of-zeros for Cortex-A9 */ 754 if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_FULL_LINE_ZERO) 755 set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1)); 756 } 757 758 static const struct l2c_init_data l2c310_init_fns __initconst = { 759 .type = "L2C-310", 760 .way_size_0 = SZ_8K, 761 .num_lock = 8, 762 .enable = l2c310_enable, 763 .fixup = l2c310_fixup, 764 .save = l2c310_save, 765 .configure = l2c310_configure, 766 .outer_cache = { 767 .inv_range = l2c210_inv_range, 768 .clean_range = l2c210_clean_range, 769 .flush_range = l2c210_flush_range, 770 .flush_all = l2c210_flush_all, 771 .disable = l2c310_disable, 772 .sync = l2c210_sync, 773 .resume = l2c310_resume, 774 }, 775 }; 776 777 static int __init __l2c_init(const struct l2c_init_data *data, 778 u32 aux_val, u32 aux_mask, u32 cache_id) 779 { 780 struct outer_cache_fns fns; 781 unsigned way_size_bits, ways; 782 u32 aux, old_aux; 783 784 /* 785 * Save the pointer globally so that callbacks which do not receive 786 * context from callers can access the structure. 787 */ 788 l2x0_data = kmemdup(data, sizeof(*data), GFP_KERNEL); 789 if (!l2x0_data) 790 return -ENOMEM; 791 792 /* 793 * Sanity check the aux values. aux_mask is the bits we preserve 794 * from reading the hardware register, and aux_val is the bits we 795 * set. 796 */ 797 if (aux_val & aux_mask) 798 pr_alert("L2C: platform provided aux values permit register corruption.\n"); 799 800 old_aux = aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL); 801 aux &= aux_mask; 802 aux |= aux_val; 803 804 if (old_aux != aux) 805 pr_warn("L2C: DT/platform modifies aux control register: 0x%08x -> 0x%08x\n", 806 old_aux, aux); 807 808 /* Determine the number of ways */ 809 switch (cache_id & L2X0_CACHE_ID_PART_MASK) { 810 case L2X0_CACHE_ID_PART_L310: 811 if ((aux_val | ~aux_mask) & (L2C_AUX_CTRL_WAY_SIZE_MASK | L310_AUX_CTRL_ASSOCIATIVITY_16)) 812 pr_warn("L2C: DT/platform tries to modify or specify cache size\n"); 813 if (aux & (1 << 16)) 814 ways = 16; 815 else 816 ways = 8; 817 break; 818 819 case L2X0_CACHE_ID_PART_L210: 820 case L2X0_CACHE_ID_PART_L220: 821 ways = (aux >> 13) & 0xf; 822 break; 823 824 case AURORA_CACHE_ID: 825 ways = (aux >> 13) & 0xf; 826 ways = 2 << ((ways + 1) >> 2); 827 break; 828 829 default: 830 /* Assume unknown chips have 8 ways */ 831 ways = 8; 832 break; 833 } 834 835 l2x0_way_mask = (1 << ways) - 1; 836 837 /* 838 * way_size_0 is the size that a way_size value of zero would be 839 * given the calculation: way_size = way_size_0 << way_size_bits. 840 * So, if way_size_bits=0 is reserved, but way_size_bits=1 is 16k, 841 * then way_size_0 would be 8k. 842 * 843 * L2 cache size = number of ways * way size. 844 */ 845 way_size_bits = (aux & L2C_AUX_CTRL_WAY_SIZE_MASK) >> 846 L2C_AUX_CTRL_WAY_SIZE_SHIFT; 847 l2x0_size = ways * (data->way_size_0 << way_size_bits); 848 849 fns = data->outer_cache; 850 fns.write_sec = outer_cache.write_sec; 851 fns.configure = outer_cache.configure; 852 if (data->fixup) 853 data->fixup(l2x0_base, cache_id, &fns); 854 855 /* 856 * Check if l2x0 controller is already enabled. If we are booting 857 * in non-secure mode accessing the below registers will fault. 858 */ 859 if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) 860 data->enable(l2x0_base, aux, data->num_lock); 861 862 outer_cache = fns; 863 864 /* 865 * It is strange to save the register state before initialisation, 866 * but hey, this is what the DT implementations decided to do. 867 */ 868 if (data->save) 869 data->save(l2x0_base); 870 871 /* Re-read it in case some bits are reserved. */ 872 aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL); 873 874 pr_info("%s cache controller enabled, %d ways, %d kB\n", 875 data->type, ways, l2x0_size >> 10); 876 pr_info("%s: CACHE_ID 0x%08x, AUX_CTRL 0x%08x\n", 877 data->type, cache_id, aux); 878 879 return 0; 880 } 881 882 void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask) 883 { 884 const struct l2c_init_data *data; 885 u32 cache_id; 886 887 l2x0_base = base; 888 889 cache_id = readl_relaxed(base + L2X0_CACHE_ID); 890 891 switch (cache_id & L2X0_CACHE_ID_PART_MASK) { 892 default: 893 case L2X0_CACHE_ID_PART_L210: 894 data = &l2c210_data; 895 break; 896 897 case L2X0_CACHE_ID_PART_L220: 898 data = &l2c220_data; 899 break; 900 901 case L2X0_CACHE_ID_PART_L310: 902 data = &l2c310_init_fns; 903 break; 904 } 905 906 /* Read back current (default) hardware configuration */ 907 if (data->save) 908 data->save(l2x0_base); 909 910 __l2c_init(data, aux_val, aux_mask, cache_id); 911 } 912 913 #ifdef CONFIG_OF 914 static int l2_wt_override; 915 916 /* Aurora don't have the cache ID register available, so we have to 917 * pass it though the device tree */ 918 static u32 cache_id_part_number_from_dt; 919 920 /** 921 * l2x0_cache_size_of_parse() - read cache size parameters from DT 922 * @np: the device tree node for the l2 cache 923 * @aux_val: pointer to machine-supplied auxilary register value, to 924 * be augmented by the call (bits to be set to 1) 925 * @aux_mask: pointer to machine-supplied auxilary register mask, to 926 * be augmented by the call (bits to be set to 0) 927 * @associativity: variable to return the calculated associativity in 928 * @max_way_size: the maximum size in bytes for the cache ways 929 */ 930 static int __init l2x0_cache_size_of_parse(const struct device_node *np, 931 u32 *aux_val, u32 *aux_mask, 932 u32 *associativity, 933 u32 max_way_size) 934 { 935 u32 mask = 0, val = 0; 936 u32 cache_size = 0, sets = 0; 937 u32 way_size_bits = 1; 938 u32 way_size = 0; 939 u32 block_size = 0; 940 u32 line_size = 0; 941 942 of_property_read_u32(np, "cache-size", &cache_size); 943 of_property_read_u32(np, "cache-sets", &sets); 944 of_property_read_u32(np, "cache-block-size", &block_size); 945 of_property_read_u32(np, "cache-line-size", &line_size); 946 947 if (!cache_size || !sets) 948 return -ENODEV; 949 950 /* All these l2 caches have the same line = block size actually */ 951 if (!line_size) { 952 if (block_size) { 953 /* If linesize is not given, it is equal to blocksize */ 954 line_size = block_size; 955 } else { 956 /* Fall back to known size */ 957 pr_warn("L2C OF: no cache block/line size given: " 958 "falling back to default size %d bytes\n", 959 CACHE_LINE_SIZE); 960 line_size = CACHE_LINE_SIZE; 961 } 962 } 963 964 if (line_size != CACHE_LINE_SIZE) 965 pr_warn("L2C OF: DT supplied line size %d bytes does " 966 "not match hardware line size of %d bytes\n", 967 line_size, 968 CACHE_LINE_SIZE); 969 970 /* 971 * Since: 972 * set size = cache size / sets 973 * ways = cache size / (sets * line size) 974 * way size = cache size / (cache size / (sets * line size)) 975 * way size = sets * line size 976 * associativity = ways = cache size / way size 977 */ 978 way_size = sets * line_size; 979 *associativity = cache_size / way_size; 980 981 if (way_size > max_way_size) { 982 pr_err("L2C OF: set size %dKB is too large\n", way_size); 983 return -EINVAL; 984 } 985 986 pr_info("L2C OF: override cache size: %d bytes (%dKB)\n", 987 cache_size, cache_size >> 10); 988 pr_info("L2C OF: override line size: %d bytes\n", line_size); 989 pr_info("L2C OF: override way size: %d bytes (%dKB)\n", 990 way_size, way_size >> 10); 991 pr_info("L2C OF: override associativity: %d\n", *associativity); 992 993 /* 994 * Calculates the bits 17:19 to set for way size: 995 * 512KB -> 6, 256KB -> 5, ... 16KB -> 1 996 */ 997 way_size_bits = ilog2(way_size >> 10) - 3; 998 if (way_size_bits < 1 || way_size_bits > 6) { 999 pr_err("L2C OF: cache way size illegal: %dKB is not mapped\n", 1000 way_size); 1001 return -EINVAL; 1002 } 1003 1004 mask |= L2C_AUX_CTRL_WAY_SIZE_MASK; 1005 val |= (way_size_bits << L2C_AUX_CTRL_WAY_SIZE_SHIFT); 1006 1007 *aux_val &= ~mask; 1008 *aux_val |= val; 1009 *aux_mask &= ~mask; 1010 1011 return 0; 1012 } 1013 1014 static void __init l2x0_of_parse(const struct device_node *np, 1015 u32 *aux_val, u32 *aux_mask) 1016 { 1017 u32 data[2] = { 0, 0 }; 1018 u32 tag = 0; 1019 u32 dirty = 0; 1020 u32 val = 0, mask = 0; 1021 u32 assoc; 1022 int ret; 1023 1024 of_property_read_u32(np, "arm,tag-latency", &tag); 1025 if (tag) { 1026 mask |= L2X0_AUX_CTRL_TAG_LATENCY_MASK; 1027 val |= (tag - 1) << L2X0_AUX_CTRL_TAG_LATENCY_SHIFT; 1028 } 1029 1030 of_property_read_u32_array(np, "arm,data-latency", 1031 data, ARRAY_SIZE(data)); 1032 if (data[0] && data[1]) { 1033 mask |= L2X0_AUX_CTRL_DATA_RD_LATENCY_MASK | 1034 L2X0_AUX_CTRL_DATA_WR_LATENCY_MASK; 1035 val |= ((data[0] - 1) << L2X0_AUX_CTRL_DATA_RD_LATENCY_SHIFT) | 1036 ((data[1] - 1) << L2X0_AUX_CTRL_DATA_WR_LATENCY_SHIFT); 1037 } 1038 1039 of_property_read_u32(np, "arm,dirty-latency", &dirty); 1040 if (dirty) { 1041 mask |= L2X0_AUX_CTRL_DIRTY_LATENCY_MASK; 1042 val |= (dirty - 1) << L2X0_AUX_CTRL_DIRTY_LATENCY_SHIFT; 1043 } 1044 1045 ret = l2x0_cache_size_of_parse(np, aux_val, aux_mask, &assoc, SZ_256K); 1046 if (ret) 1047 return; 1048 1049 if (assoc > 8) { 1050 pr_err("l2x0 of: cache setting yield too high associativity\n"); 1051 pr_err("l2x0 of: %d calculated, max 8\n", assoc); 1052 } else { 1053 mask |= L2X0_AUX_CTRL_ASSOC_MASK; 1054 val |= (assoc << L2X0_AUX_CTRL_ASSOC_SHIFT); 1055 } 1056 1057 *aux_val &= ~mask; 1058 *aux_val |= val; 1059 *aux_mask &= ~mask; 1060 } 1061 1062 static const struct l2c_init_data of_l2c210_data __initconst = { 1063 .type = "L2C-210", 1064 .way_size_0 = SZ_8K, 1065 .num_lock = 1, 1066 .of_parse = l2x0_of_parse, 1067 .enable = l2c_enable, 1068 .save = l2c_save, 1069 .outer_cache = { 1070 .inv_range = l2c210_inv_range, 1071 .clean_range = l2c210_clean_range, 1072 .flush_range = l2c210_flush_range, 1073 .flush_all = l2c210_flush_all, 1074 .disable = l2c_disable, 1075 .sync = l2c210_sync, 1076 .resume = l2c_resume, 1077 }, 1078 }; 1079 1080 static const struct l2c_init_data of_l2c220_data __initconst = { 1081 .type = "L2C-220", 1082 .way_size_0 = SZ_8K, 1083 .num_lock = 1, 1084 .of_parse = l2x0_of_parse, 1085 .enable = l2c220_enable, 1086 .save = l2c_save, 1087 .outer_cache = { 1088 .inv_range = l2c220_inv_range, 1089 .clean_range = l2c220_clean_range, 1090 .flush_range = l2c220_flush_range, 1091 .flush_all = l2c220_flush_all, 1092 .disable = l2c_disable, 1093 .sync = l2c220_sync, 1094 .resume = l2c_resume, 1095 }, 1096 }; 1097 1098 static void __init l2c310_of_parse(const struct device_node *np, 1099 u32 *aux_val, u32 *aux_mask) 1100 { 1101 u32 data[3] = { 0, 0, 0 }; 1102 u32 tag[3] = { 0, 0, 0 }; 1103 u32 filter[2] = { 0, 0 }; 1104 u32 assoc; 1105 u32 prefetch; 1106 u32 val; 1107 int ret; 1108 1109 of_property_read_u32_array(np, "arm,tag-latency", tag, ARRAY_SIZE(tag)); 1110 if (tag[0] && tag[1] && tag[2]) 1111 l2x0_saved_regs.tag_latency = 1112 L310_LATENCY_CTRL_RD(tag[0] - 1) | 1113 L310_LATENCY_CTRL_WR(tag[1] - 1) | 1114 L310_LATENCY_CTRL_SETUP(tag[2] - 1); 1115 1116 of_property_read_u32_array(np, "arm,data-latency", 1117 data, ARRAY_SIZE(data)); 1118 if (data[0] && data[1] && data[2]) 1119 l2x0_saved_regs.data_latency = 1120 L310_LATENCY_CTRL_RD(data[0] - 1) | 1121 L310_LATENCY_CTRL_WR(data[1] - 1) | 1122 L310_LATENCY_CTRL_SETUP(data[2] - 1); 1123 1124 of_property_read_u32_array(np, "arm,filter-ranges", 1125 filter, ARRAY_SIZE(filter)); 1126 if (filter[1]) { 1127 l2x0_saved_regs.filter_end = 1128 ALIGN(filter[0] + filter[1], SZ_1M); 1129 l2x0_saved_regs.filter_start = (filter[0] & ~(SZ_1M - 1)) 1130 | L310_ADDR_FILTER_EN; 1131 } 1132 1133 ret = l2x0_cache_size_of_parse(np, aux_val, aux_mask, &assoc, SZ_512K); 1134 if (ret) 1135 return; 1136 1137 switch (assoc) { 1138 case 16: 1139 *aux_val &= ~L2X0_AUX_CTRL_ASSOC_MASK; 1140 *aux_val |= L310_AUX_CTRL_ASSOCIATIVITY_16; 1141 *aux_mask &= ~L2X0_AUX_CTRL_ASSOC_MASK; 1142 break; 1143 case 8: 1144 *aux_val &= ~L2X0_AUX_CTRL_ASSOC_MASK; 1145 *aux_mask &= ~L2X0_AUX_CTRL_ASSOC_MASK; 1146 break; 1147 default: 1148 pr_err("L2C-310 OF cache associativity %d invalid, only 8 or 16 permitted\n", 1149 assoc); 1150 break; 1151 } 1152 1153 prefetch = l2x0_saved_regs.prefetch_ctrl; 1154 1155 ret = of_property_read_u32(np, "arm,double-linefill", &val); 1156 if (ret == 0) { 1157 if (val) 1158 prefetch |= L310_PREFETCH_CTRL_DBL_LINEFILL; 1159 else 1160 prefetch &= ~L310_PREFETCH_CTRL_DBL_LINEFILL; 1161 } else if (ret != -EINVAL) { 1162 pr_err("L2C-310 OF arm,double-linefill property value is missing\n"); 1163 } 1164 1165 ret = of_property_read_u32(np, "arm,double-linefill-incr", &val); 1166 if (ret == 0) { 1167 if (val) 1168 prefetch |= L310_PREFETCH_CTRL_DBL_LINEFILL_INCR; 1169 else 1170 prefetch &= ~L310_PREFETCH_CTRL_DBL_LINEFILL_INCR; 1171 } else if (ret != -EINVAL) { 1172 pr_err("L2C-310 OF arm,double-linefill-incr property value is missing\n"); 1173 } 1174 1175 ret = of_property_read_u32(np, "arm,double-linefill-wrap", &val); 1176 if (ret == 0) { 1177 if (!val) 1178 prefetch |= L310_PREFETCH_CTRL_DBL_LINEFILL_WRAP; 1179 else 1180 prefetch &= ~L310_PREFETCH_CTRL_DBL_LINEFILL_WRAP; 1181 } else if (ret != -EINVAL) { 1182 pr_err("L2C-310 OF arm,double-linefill-wrap property value is missing\n"); 1183 } 1184 1185 ret = of_property_read_u32(np, "arm,prefetch-drop", &val); 1186 if (ret == 0) { 1187 if (val) 1188 prefetch |= L310_PREFETCH_CTRL_PREFETCH_DROP; 1189 else 1190 prefetch &= ~L310_PREFETCH_CTRL_PREFETCH_DROP; 1191 } else if (ret != -EINVAL) { 1192 pr_err("L2C-310 OF arm,prefetch-drop property value is missing\n"); 1193 } 1194 1195 ret = of_property_read_u32(np, "arm,prefetch-offset", &val); 1196 if (ret == 0) { 1197 prefetch &= ~L310_PREFETCH_CTRL_OFFSET_MASK; 1198 prefetch |= val & L310_PREFETCH_CTRL_OFFSET_MASK; 1199 } else if (ret != -EINVAL) { 1200 pr_err("L2C-310 OF arm,prefetch-offset property value is missing\n"); 1201 } 1202 1203 l2x0_saved_regs.prefetch_ctrl = prefetch; 1204 } 1205 1206 static const struct l2c_init_data of_l2c310_data __initconst = { 1207 .type = "L2C-310", 1208 .way_size_0 = SZ_8K, 1209 .num_lock = 8, 1210 .of_parse = l2c310_of_parse, 1211 .enable = l2c310_enable, 1212 .fixup = l2c310_fixup, 1213 .save = l2c310_save, 1214 .configure = l2c310_configure, 1215 .outer_cache = { 1216 .inv_range = l2c210_inv_range, 1217 .clean_range = l2c210_clean_range, 1218 .flush_range = l2c210_flush_range, 1219 .flush_all = l2c210_flush_all, 1220 .disable = l2c310_disable, 1221 .sync = l2c210_sync, 1222 .resume = l2c310_resume, 1223 }, 1224 }; 1225 1226 /* 1227 * This is a variant of the of_l2c310_data with .sync set to 1228 * NULL. Outer sync operations are not needed when the system is I/O 1229 * coherent, and potentially harmful in certain situations (PCIe/PL310 1230 * deadlock on Armada 375/38x due to hardware I/O coherency). The 1231 * other operations are kept because they are infrequent (therefore do 1232 * not cause the deadlock in practice) and needed for secondary CPU 1233 * boot and other power management activities. 1234 */ 1235 static const struct l2c_init_data of_l2c310_coherent_data __initconst = { 1236 .type = "L2C-310 Coherent", 1237 .way_size_0 = SZ_8K, 1238 .num_lock = 8, 1239 .of_parse = l2c310_of_parse, 1240 .enable = l2c310_enable, 1241 .fixup = l2c310_fixup, 1242 .save = l2c310_save, 1243 .configure = l2c310_configure, 1244 .outer_cache = { 1245 .inv_range = l2c210_inv_range, 1246 .clean_range = l2c210_clean_range, 1247 .flush_range = l2c210_flush_range, 1248 .flush_all = l2c210_flush_all, 1249 .disable = l2c310_disable, 1250 .resume = l2c310_resume, 1251 }, 1252 }; 1253 1254 /* 1255 * Note that the end addresses passed to Linux primitives are 1256 * noninclusive, while the hardware cache range operations use 1257 * inclusive start and end addresses. 1258 */ 1259 static unsigned long aurora_range_end(unsigned long start, unsigned long end) 1260 { 1261 /* 1262 * Limit the number of cache lines processed at once, 1263 * since cache range operations stall the CPU pipeline 1264 * until completion. 1265 */ 1266 if (end > start + MAX_RANGE_SIZE) 1267 end = start + MAX_RANGE_SIZE; 1268 1269 /* 1270 * Cache range operations can't straddle a page boundary. 1271 */ 1272 if (end > PAGE_ALIGN(start+1)) 1273 end = PAGE_ALIGN(start+1); 1274 1275 return end; 1276 } 1277 1278 static void aurora_pa_range(unsigned long start, unsigned long end, 1279 unsigned long offset) 1280 { 1281 void __iomem *base = l2x0_base; 1282 unsigned long range_end; 1283 unsigned long flags; 1284 1285 /* 1286 * round start and end adresses up to cache line size 1287 */ 1288 start &= ~(CACHE_LINE_SIZE - 1); 1289 end = ALIGN(end, CACHE_LINE_SIZE); 1290 1291 /* 1292 * perform operation on all full cache lines between 'start' and 'end' 1293 */ 1294 while (start < end) { 1295 range_end = aurora_range_end(start, end); 1296 1297 raw_spin_lock_irqsave(&l2x0_lock, flags); 1298 writel_relaxed(start, base + AURORA_RANGE_BASE_ADDR_REG); 1299 writel_relaxed(range_end - CACHE_LINE_SIZE, base + offset); 1300 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 1301 1302 writel_relaxed(0, base + AURORA_SYNC_REG); 1303 start = range_end; 1304 } 1305 } 1306 static void aurora_inv_range(unsigned long start, unsigned long end) 1307 { 1308 aurora_pa_range(start, end, AURORA_INVAL_RANGE_REG); 1309 } 1310 1311 static void aurora_clean_range(unsigned long start, unsigned long end) 1312 { 1313 /* 1314 * If L2 is forced to WT, the L2 will always be clean and we 1315 * don't need to do anything here. 1316 */ 1317 if (!l2_wt_override) 1318 aurora_pa_range(start, end, AURORA_CLEAN_RANGE_REG); 1319 } 1320 1321 static void aurora_flush_range(unsigned long start, unsigned long end) 1322 { 1323 if (l2_wt_override) 1324 aurora_pa_range(start, end, AURORA_INVAL_RANGE_REG); 1325 else 1326 aurora_pa_range(start, end, AURORA_FLUSH_RANGE_REG); 1327 } 1328 1329 static void aurora_flush_all(void) 1330 { 1331 void __iomem *base = l2x0_base; 1332 unsigned long flags; 1333 1334 /* clean all ways */ 1335 raw_spin_lock_irqsave(&l2x0_lock, flags); 1336 __l2c_op_way(base + L2X0_CLEAN_INV_WAY); 1337 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 1338 1339 writel_relaxed(0, base + AURORA_SYNC_REG); 1340 } 1341 1342 static void aurora_cache_sync(void) 1343 { 1344 writel_relaxed(0, l2x0_base + AURORA_SYNC_REG); 1345 } 1346 1347 static void aurora_disable(void) 1348 { 1349 void __iomem *base = l2x0_base; 1350 unsigned long flags; 1351 1352 raw_spin_lock_irqsave(&l2x0_lock, flags); 1353 __l2c_op_way(base + L2X0_CLEAN_INV_WAY); 1354 writel_relaxed(0, base + AURORA_SYNC_REG); 1355 l2c_write_sec(0, base, L2X0_CTRL); 1356 dsb(st); 1357 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 1358 } 1359 1360 static void aurora_save(void __iomem *base) 1361 { 1362 l2x0_saved_regs.ctrl = readl_relaxed(base + L2X0_CTRL); 1363 l2x0_saved_regs.aux_ctrl = readl_relaxed(base + L2X0_AUX_CTRL); 1364 } 1365 1366 /* 1367 * For Aurora cache in no outer mode, enable via the CP15 coprocessor 1368 * broadcasting of cache commands to L2. 1369 */ 1370 static void __init aurora_enable_no_outer(void __iomem *base, u32 aux, 1371 unsigned num_lock) 1372 { 1373 u32 u; 1374 1375 asm volatile("mrc p15, 1, %0, c15, c2, 0" : "=r" (u)); 1376 u |= AURORA_CTRL_FW; /* Set the FW bit */ 1377 asm volatile("mcr p15, 1, %0, c15, c2, 0" : : "r" (u)); 1378 1379 isb(); 1380 1381 l2c_enable(base, aux, num_lock); 1382 } 1383 1384 static void __init aurora_fixup(void __iomem *base, u32 cache_id, 1385 struct outer_cache_fns *fns) 1386 { 1387 sync_reg_offset = AURORA_SYNC_REG; 1388 } 1389 1390 static void __init aurora_of_parse(const struct device_node *np, 1391 u32 *aux_val, u32 *aux_mask) 1392 { 1393 u32 val = AURORA_ACR_REPLACEMENT_TYPE_SEMIPLRU; 1394 u32 mask = AURORA_ACR_REPLACEMENT_MASK; 1395 1396 of_property_read_u32(np, "cache-id-part", 1397 &cache_id_part_number_from_dt); 1398 1399 /* Determine and save the write policy */ 1400 l2_wt_override = of_property_read_bool(np, "wt-override"); 1401 1402 if (l2_wt_override) { 1403 val |= AURORA_ACR_FORCE_WRITE_THRO_POLICY; 1404 mask |= AURORA_ACR_FORCE_WRITE_POLICY_MASK; 1405 } 1406 1407 *aux_val &= ~mask; 1408 *aux_val |= val; 1409 *aux_mask &= ~mask; 1410 } 1411 1412 static const struct l2c_init_data of_aurora_with_outer_data __initconst = { 1413 .type = "Aurora", 1414 .way_size_0 = SZ_4K, 1415 .num_lock = 4, 1416 .of_parse = aurora_of_parse, 1417 .enable = l2c_enable, 1418 .fixup = aurora_fixup, 1419 .save = aurora_save, 1420 .outer_cache = { 1421 .inv_range = aurora_inv_range, 1422 .clean_range = aurora_clean_range, 1423 .flush_range = aurora_flush_range, 1424 .flush_all = aurora_flush_all, 1425 .disable = aurora_disable, 1426 .sync = aurora_cache_sync, 1427 .resume = l2c_resume, 1428 }, 1429 }; 1430 1431 static const struct l2c_init_data of_aurora_no_outer_data __initconst = { 1432 .type = "Aurora", 1433 .way_size_0 = SZ_4K, 1434 .num_lock = 4, 1435 .of_parse = aurora_of_parse, 1436 .enable = aurora_enable_no_outer, 1437 .fixup = aurora_fixup, 1438 .save = aurora_save, 1439 .outer_cache = { 1440 .resume = l2c_resume, 1441 }, 1442 }; 1443 1444 /* 1445 * For certain Broadcom SoCs, depending on the address range, different offsets 1446 * need to be added to the address before passing it to L2 for 1447 * invalidation/clean/flush 1448 * 1449 * Section Address Range Offset EMI 1450 * 1 0x00000000 - 0x3FFFFFFF 0x80000000 VC 1451 * 2 0x40000000 - 0xBFFFFFFF 0x40000000 SYS 1452 * 3 0xC0000000 - 0xFFFFFFFF 0x80000000 VC 1453 * 1454 * When the start and end addresses have crossed two different sections, we 1455 * need to break the L2 operation into two, each within its own section. 1456 * For example, if we need to invalidate addresses starts at 0xBFFF0000 and 1457 * ends at 0xC0001000, we need do invalidate 1) 0xBFFF0000 - 0xBFFFFFFF and 2) 1458 * 0xC0000000 - 0xC0001000 1459 * 1460 * Note 1: 1461 * By breaking a single L2 operation into two, we may potentially suffer some 1462 * performance hit, but keep in mind the cross section case is very rare 1463 * 1464 * Note 2: 1465 * We do not need to handle the case when the start address is in 1466 * Section 1 and the end address is in Section 3, since it is not a valid use 1467 * case 1468 * 1469 * Note 3: 1470 * Section 1 in practical terms can no longer be used on rev A2. Because of 1471 * that the code does not need to handle section 1 at all. 1472 * 1473 */ 1474 #define BCM_SYS_EMI_START_ADDR 0x40000000UL 1475 #define BCM_VC_EMI_SEC3_START_ADDR 0xC0000000UL 1476 1477 #define BCM_SYS_EMI_OFFSET 0x40000000UL 1478 #define BCM_VC_EMI_OFFSET 0x80000000UL 1479 1480 static inline int bcm_addr_is_sys_emi(unsigned long addr) 1481 { 1482 return (addr >= BCM_SYS_EMI_START_ADDR) && 1483 (addr < BCM_VC_EMI_SEC3_START_ADDR); 1484 } 1485 1486 static inline unsigned long bcm_l2_phys_addr(unsigned long addr) 1487 { 1488 if (bcm_addr_is_sys_emi(addr)) 1489 return addr + BCM_SYS_EMI_OFFSET; 1490 else 1491 return addr + BCM_VC_EMI_OFFSET; 1492 } 1493 1494 static void bcm_inv_range(unsigned long start, unsigned long end) 1495 { 1496 unsigned long new_start, new_end; 1497 1498 BUG_ON(start < BCM_SYS_EMI_START_ADDR); 1499 1500 if (unlikely(end <= start)) 1501 return; 1502 1503 new_start = bcm_l2_phys_addr(start); 1504 new_end = bcm_l2_phys_addr(end); 1505 1506 /* normal case, no cross section between start and end */ 1507 if (likely(bcm_addr_is_sys_emi(end) || !bcm_addr_is_sys_emi(start))) { 1508 l2c210_inv_range(new_start, new_end); 1509 return; 1510 } 1511 1512 /* They cross sections, so it can only be a cross from section 1513 * 2 to section 3 1514 */ 1515 l2c210_inv_range(new_start, 1516 bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR-1)); 1517 l2c210_inv_range(bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR), 1518 new_end); 1519 } 1520 1521 static void bcm_clean_range(unsigned long start, unsigned long end) 1522 { 1523 unsigned long new_start, new_end; 1524 1525 BUG_ON(start < BCM_SYS_EMI_START_ADDR); 1526 1527 if (unlikely(end <= start)) 1528 return; 1529 1530 new_start = bcm_l2_phys_addr(start); 1531 new_end = bcm_l2_phys_addr(end); 1532 1533 /* normal case, no cross section between start and end */ 1534 if (likely(bcm_addr_is_sys_emi(end) || !bcm_addr_is_sys_emi(start))) { 1535 l2c210_clean_range(new_start, new_end); 1536 return; 1537 } 1538 1539 /* They cross sections, so it can only be a cross from section 1540 * 2 to section 3 1541 */ 1542 l2c210_clean_range(new_start, 1543 bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR-1)); 1544 l2c210_clean_range(bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR), 1545 new_end); 1546 } 1547 1548 static void bcm_flush_range(unsigned long start, unsigned long end) 1549 { 1550 unsigned long new_start, new_end; 1551 1552 BUG_ON(start < BCM_SYS_EMI_START_ADDR); 1553 1554 if (unlikely(end <= start)) 1555 return; 1556 1557 if ((end - start) >= l2x0_size) { 1558 outer_cache.flush_all(); 1559 return; 1560 } 1561 1562 new_start = bcm_l2_phys_addr(start); 1563 new_end = bcm_l2_phys_addr(end); 1564 1565 /* normal case, no cross section between start and end */ 1566 if (likely(bcm_addr_is_sys_emi(end) || !bcm_addr_is_sys_emi(start))) { 1567 l2c210_flush_range(new_start, new_end); 1568 return; 1569 } 1570 1571 /* They cross sections, so it can only be a cross from section 1572 * 2 to section 3 1573 */ 1574 l2c210_flush_range(new_start, 1575 bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR-1)); 1576 l2c210_flush_range(bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR), 1577 new_end); 1578 } 1579 1580 /* Broadcom L2C-310 start from ARMs R3P2 or later, and require no fixups */ 1581 static const struct l2c_init_data of_bcm_l2x0_data __initconst = { 1582 .type = "BCM-L2C-310", 1583 .way_size_0 = SZ_8K, 1584 .num_lock = 8, 1585 .of_parse = l2c310_of_parse, 1586 .enable = l2c310_enable, 1587 .save = l2c310_save, 1588 .configure = l2c310_configure, 1589 .outer_cache = { 1590 .inv_range = bcm_inv_range, 1591 .clean_range = bcm_clean_range, 1592 .flush_range = bcm_flush_range, 1593 .flush_all = l2c210_flush_all, 1594 .disable = l2c310_disable, 1595 .sync = l2c210_sync, 1596 .resume = l2c310_resume, 1597 }, 1598 }; 1599 1600 static void __init tauros3_save(void __iomem *base) 1601 { 1602 l2c_save(base); 1603 1604 l2x0_saved_regs.aux2_ctrl = 1605 readl_relaxed(base + TAUROS3_AUX2_CTRL); 1606 l2x0_saved_regs.prefetch_ctrl = 1607 readl_relaxed(base + L310_PREFETCH_CTRL); 1608 } 1609 1610 static void tauros3_configure(void __iomem *base) 1611 { 1612 writel_relaxed(l2x0_saved_regs.aux2_ctrl, 1613 base + TAUROS3_AUX2_CTRL); 1614 writel_relaxed(l2x0_saved_regs.prefetch_ctrl, 1615 base + L310_PREFETCH_CTRL); 1616 } 1617 1618 static const struct l2c_init_data of_tauros3_data __initconst = { 1619 .type = "Tauros3", 1620 .way_size_0 = SZ_8K, 1621 .num_lock = 8, 1622 .enable = l2c_enable, 1623 .save = tauros3_save, 1624 .configure = tauros3_configure, 1625 /* Tauros3 broadcasts L1 cache operations to L2 */ 1626 .outer_cache = { 1627 .resume = l2c_resume, 1628 }, 1629 }; 1630 1631 #define L2C_ID(name, fns) { .compatible = name, .data = (void *)&fns } 1632 static const struct of_device_id l2x0_ids[] __initconst = { 1633 L2C_ID("arm,l210-cache", of_l2c210_data), 1634 L2C_ID("arm,l220-cache", of_l2c220_data), 1635 L2C_ID("arm,pl310-cache", of_l2c310_data), 1636 L2C_ID("brcm,bcm11351-a2-pl310-cache", of_bcm_l2x0_data), 1637 L2C_ID("marvell,aurora-outer-cache", of_aurora_with_outer_data), 1638 L2C_ID("marvell,aurora-system-cache", of_aurora_no_outer_data), 1639 L2C_ID("marvell,tauros3-cache", of_tauros3_data), 1640 /* Deprecated IDs */ 1641 L2C_ID("bcm,bcm11351-a2-pl310-cache", of_bcm_l2x0_data), 1642 {} 1643 }; 1644 1645 int __init l2x0_of_init(u32 aux_val, u32 aux_mask) 1646 { 1647 const struct l2c_init_data *data; 1648 struct device_node *np; 1649 struct resource res; 1650 u32 cache_id, old_aux; 1651 u32 cache_level = 2; 1652 1653 np = of_find_matching_node(NULL, l2x0_ids); 1654 if (!np) 1655 return -ENODEV; 1656 1657 if (of_address_to_resource(np, 0, &res)) 1658 return -ENODEV; 1659 1660 l2x0_base = ioremap(res.start, resource_size(&res)); 1661 if (!l2x0_base) 1662 return -ENOMEM; 1663 1664 l2x0_saved_regs.phy_base = res.start; 1665 1666 data = of_match_node(l2x0_ids, np)->data; 1667 1668 if (of_device_is_compatible(np, "arm,pl310-cache") && 1669 of_property_read_bool(np, "arm,io-coherent")) 1670 data = &of_l2c310_coherent_data; 1671 1672 old_aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL); 1673 if (old_aux != ((old_aux & aux_mask) | aux_val)) { 1674 pr_warn("L2C: platform modifies aux control register: 0x%08x -> 0x%08x\n", 1675 old_aux, (old_aux & aux_mask) | aux_val); 1676 } else if (aux_mask != ~0U && aux_val != 0) { 1677 pr_alert("L2C: platform provided aux values match the hardware, so have no effect. Please remove them.\n"); 1678 } 1679 1680 /* All L2 caches are unified, so this property should be specified */ 1681 if (!of_property_read_bool(np, "cache-unified")) 1682 pr_err("L2C: device tree omits to specify unified cache\n"); 1683 1684 if (of_property_read_u32(np, "cache-level", &cache_level)) 1685 pr_err("L2C: device tree omits to specify cache-level\n"); 1686 1687 if (cache_level != 2) 1688 pr_err("L2C: device tree specifies invalid cache level\n"); 1689 1690 /* Read back current (default) hardware configuration */ 1691 if (data->save) 1692 data->save(l2x0_base); 1693 1694 /* L2 configuration can only be changed if the cache is disabled */ 1695 if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) 1696 if (data->of_parse) 1697 data->of_parse(np, &aux_val, &aux_mask); 1698 1699 if (cache_id_part_number_from_dt) 1700 cache_id = cache_id_part_number_from_dt; 1701 else 1702 cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID); 1703 1704 return __l2c_init(data, aux_val, aux_mask, cache_id); 1705 } 1706 #endif 1707