1 /* 2 * arch/arm/mm/cache-l2x0.c - L210/L220 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/err.h> 20 #include <linux/init.h> 21 #include <linux/spinlock.h> 22 #include <linux/io.h> 23 #include <linux/of.h> 24 #include <linux/of_address.h> 25 26 #include <asm/cacheflush.h> 27 #include <asm/hardware/cache-l2x0.h> 28 #include "cache-tauros3.h" 29 #include "cache-aurora-l2.h" 30 31 struct l2c_init_data { 32 unsigned num_lock; 33 void (*of_parse)(const struct device_node *, u32 *, u32 *); 34 void (*enable)(void __iomem *, u32, unsigned); 35 void (*save)(void __iomem *); 36 struct outer_cache_fns outer_cache; 37 }; 38 39 #define CACHE_LINE_SIZE 32 40 41 static void __iomem *l2x0_base; 42 static DEFINE_RAW_SPINLOCK(l2x0_lock); 43 static u32 l2x0_way_mask; /* Bitmask of active ways */ 44 static u32 l2x0_size; 45 static unsigned long sync_reg_offset = L2X0_CACHE_SYNC; 46 47 struct l2x0_regs l2x0_saved_regs; 48 49 /* 50 * Common code for all cache controllers. 51 */ 52 static inline void l2c_wait_mask(void __iomem *reg, unsigned long mask) 53 { 54 /* wait for cache operation by line or way to complete */ 55 while (readl_relaxed(reg) & mask) 56 cpu_relax(); 57 } 58 59 /* 60 * This should only be called when we have a requirement that the 61 * register be written due to a work-around, as platforms running 62 * in non-secure mode may not be able to access this register. 63 */ 64 static inline void l2c_set_debug(void __iomem *base, unsigned long val) 65 { 66 outer_cache.set_debug(val); 67 } 68 69 static void __l2c_op_way(void __iomem *reg) 70 { 71 writel_relaxed(l2x0_way_mask, reg); 72 l2c_wait_mask(reg, l2x0_way_mask); 73 } 74 75 static inline void l2c_unlock(void __iomem *base, unsigned num) 76 { 77 unsigned i; 78 79 for (i = 0; i < num; i++) { 80 writel_relaxed(0, base + L2X0_LOCKDOWN_WAY_D_BASE + 81 i * L2X0_LOCKDOWN_STRIDE); 82 writel_relaxed(0, base + L2X0_LOCKDOWN_WAY_I_BASE + 83 i * L2X0_LOCKDOWN_STRIDE); 84 } 85 } 86 87 /* 88 * Enable the L2 cache controller. This function must only be 89 * called when the cache controller is known to be disabled. 90 */ 91 static void l2c_enable(void __iomem *base, u32 aux, unsigned num_lock) 92 { 93 unsigned long flags; 94 95 /* Only write the aux register if it needs changing */ 96 if (readl_relaxed(base + L2X0_AUX_CTRL) != aux) 97 writel_relaxed(aux, base + L2X0_AUX_CTRL); 98 99 l2c_unlock(base, num_lock); 100 101 local_irq_save(flags); 102 __l2c_op_way(base + L2X0_INV_WAY); 103 writel_relaxed(0, base + sync_reg_offset); 104 l2c_wait_mask(base + sync_reg_offset, 1); 105 local_irq_restore(flags); 106 107 writel_relaxed(L2X0_CTRL_EN, base + L2X0_CTRL); 108 } 109 110 static void l2c_disable(void) 111 { 112 void __iomem *base = l2x0_base; 113 114 outer_cache.flush_all(); 115 writel_relaxed(0, base + L2X0_CTRL); 116 dsb(st); 117 } 118 119 #ifdef CONFIG_CACHE_PL310 120 static inline void cache_wait(void __iomem *reg, unsigned long mask) 121 { 122 /* cache operations by line are atomic on PL310 */ 123 } 124 #else 125 #define cache_wait l2c_wait_mask 126 #endif 127 128 static inline void cache_sync(void) 129 { 130 void __iomem *base = l2x0_base; 131 132 writel_relaxed(0, base + sync_reg_offset); 133 cache_wait(base + L2X0_CACHE_SYNC, 1); 134 } 135 136 static inline void l2x0_clean_line(unsigned long addr) 137 { 138 void __iomem *base = l2x0_base; 139 cache_wait(base + L2X0_CLEAN_LINE_PA, 1); 140 writel_relaxed(addr, base + L2X0_CLEAN_LINE_PA); 141 } 142 143 static inline void l2x0_inv_line(unsigned long addr) 144 { 145 void __iomem *base = l2x0_base; 146 cache_wait(base + L2X0_INV_LINE_PA, 1); 147 writel_relaxed(addr, base + L2X0_INV_LINE_PA); 148 } 149 150 #if defined(CONFIG_PL310_ERRATA_588369) || defined(CONFIG_PL310_ERRATA_727915) 151 static inline void debug_writel(unsigned long val) 152 { 153 if (outer_cache.set_debug) 154 l2c_set_debug(l2x0_base, val); 155 } 156 157 static void pl310_set_debug(unsigned long val) 158 { 159 writel_relaxed(val, l2x0_base + L2X0_DEBUG_CTRL); 160 } 161 #else 162 /* Optimised out for non-errata case */ 163 static inline void debug_writel(unsigned long val) 164 { 165 } 166 167 #define pl310_set_debug NULL 168 #endif 169 170 #ifdef CONFIG_PL310_ERRATA_588369 171 static inline void l2x0_flush_line(unsigned long addr) 172 { 173 void __iomem *base = l2x0_base; 174 175 /* Clean by PA followed by Invalidate by PA */ 176 cache_wait(base + L2X0_CLEAN_LINE_PA, 1); 177 writel_relaxed(addr, base + L2X0_CLEAN_LINE_PA); 178 cache_wait(base + L2X0_INV_LINE_PA, 1); 179 writel_relaxed(addr, base + L2X0_INV_LINE_PA); 180 } 181 #else 182 183 static inline void l2x0_flush_line(unsigned long addr) 184 { 185 void __iomem *base = l2x0_base; 186 cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1); 187 writel_relaxed(addr, base + L2X0_CLEAN_INV_LINE_PA); 188 } 189 #endif 190 191 static void l2x0_cache_sync(void) 192 { 193 unsigned long flags; 194 195 raw_spin_lock_irqsave(&l2x0_lock, flags); 196 cache_sync(); 197 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 198 } 199 200 static void __l2x0_flush_all(void) 201 { 202 debug_writel(0x03); 203 __l2c_op_way(l2x0_base + L2X0_CLEAN_INV_WAY); 204 cache_sync(); 205 debug_writel(0x00); 206 } 207 208 static void l2x0_flush_all(void) 209 { 210 unsigned long flags; 211 212 /* clean all ways */ 213 raw_spin_lock_irqsave(&l2x0_lock, flags); 214 __l2x0_flush_all(); 215 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 216 } 217 218 static void l2x0_clean_all(void) 219 { 220 unsigned long flags; 221 222 /* clean all ways */ 223 raw_spin_lock_irqsave(&l2x0_lock, flags); 224 __l2c_op_way(l2x0_base + L2X0_CLEAN_WAY); 225 cache_sync(); 226 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 227 } 228 229 static void l2x0_inv_all(void) 230 { 231 unsigned long flags; 232 233 /* invalidate all ways */ 234 raw_spin_lock_irqsave(&l2x0_lock, flags); 235 /* Invalidating when L2 is enabled is a nono */ 236 BUG_ON(readl(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN); 237 __l2c_op_way(l2x0_base + L2X0_INV_WAY); 238 cache_sync(); 239 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 240 } 241 242 static void l2x0_inv_range(unsigned long start, unsigned long end) 243 { 244 void __iomem *base = l2x0_base; 245 unsigned long flags; 246 247 raw_spin_lock_irqsave(&l2x0_lock, flags); 248 if (start & (CACHE_LINE_SIZE - 1)) { 249 start &= ~(CACHE_LINE_SIZE - 1); 250 debug_writel(0x03); 251 l2x0_flush_line(start); 252 debug_writel(0x00); 253 start += CACHE_LINE_SIZE; 254 } 255 256 if (end & (CACHE_LINE_SIZE - 1)) { 257 end &= ~(CACHE_LINE_SIZE - 1); 258 debug_writel(0x03); 259 l2x0_flush_line(end); 260 debug_writel(0x00); 261 } 262 263 while (start < end) { 264 unsigned long blk_end = start + min(end - start, 4096UL); 265 266 while (start < blk_end) { 267 l2x0_inv_line(start); 268 start += CACHE_LINE_SIZE; 269 } 270 271 if (blk_end < end) { 272 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 273 raw_spin_lock_irqsave(&l2x0_lock, flags); 274 } 275 } 276 cache_wait(base + L2X0_INV_LINE_PA, 1); 277 cache_sync(); 278 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 279 } 280 281 static void l2x0_clean_range(unsigned long start, unsigned long end) 282 { 283 void __iomem *base = l2x0_base; 284 unsigned long flags; 285 286 if ((end - start) >= l2x0_size) { 287 l2x0_clean_all(); 288 return; 289 } 290 291 raw_spin_lock_irqsave(&l2x0_lock, flags); 292 start &= ~(CACHE_LINE_SIZE - 1); 293 while (start < end) { 294 unsigned long blk_end = start + min(end - start, 4096UL); 295 296 while (start < blk_end) { 297 l2x0_clean_line(start); 298 start += CACHE_LINE_SIZE; 299 } 300 301 if (blk_end < end) { 302 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 303 raw_spin_lock_irqsave(&l2x0_lock, flags); 304 } 305 } 306 cache_wait(base + L2X0_CLEAN_LINE_PA, 1); 307 cache_sync(); 308 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 309 } 310 311 static void l2x0_flush_range(unsigned long start, unsigned long end) 312 { 313 void __iomem *base = l2x0_base; 314 unsigned long flags; 315 316 if ((end - start) >= l2x0_size) { 317 l2x0_flush_all(); 318 return; 319 } 320 321 raw_spin_lock_irqsave(&l2x0_lock, flags); 322 start &= ~(CACHE_LINE_SIZE - 1); 323 while (start < end) { 324 unsigned long blk_end = start + min(end - start, 4096UL); 325 326 debug_writel(0x03); 327 while (start < blk_end) { 328 l2x0_flush_line(start); 329 start += CACHE_LINE_SIZE; 330 } 331 debug_writel(0x00); 332 333 if (blk_end < end) { 334 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 335 raw_spin_lock_irqsave(&l2x0_lock, flags); 336 } 337 } 338 cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1); 339 cache_sync(); 340 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 341 } 342 343 static void l2x0_disable(void) 344 { 345 unsigned long flags; 346 347 raw_spin_lock_irqsave(&l2x0_lock, flags); 348 __l2x0_flush_all(); 349 writel_relaxed(0, l2x0_base + L2X0_CTRL); 350 dsb(st); 351 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 352 } 353 354 static void l2x0_unlock(u32 cache_id) 355 { 356 int lockregs; 357 358 switch (cache_id & L2X0_CACHE_ID_PART_MASK) { 359 case L2X0_CACHE_ID_PART_L310: 360 lockregs = 8; 361 break; 362 default: 363 /* L210 and unknown types */ 364 lockregs = 1; 365 break; 366 } 367 368 l2c_unlock(l2x0_base, lockregs); 369 } 370 371 static void l2x0_enable(void __iomem *base, u32 aux, unsigned num_lock) 372 { 373 /* l2x0 controller is disabled */ 374 writel_relaxed(aux, base + L2X0_AUX_CTRL); 375 376 /* Make sure that I&D is not locked down when starting */ 377 l2x0_unlock(readl_relaxed(base + L2X0_CACHE_ID)); 378 379 l2x0_inv_all(); 380 381 /* enable L2X0 */ 382 writel_relaxed(L2X0_CTRL_EN, base + L2X0_CTRL); 383 } 384 385 static const struct l2c_init_data l2x0_init_fns __initconst = { 386 .enable = l2x0_enable, 387 .outer_cache = { 388 .inv_range = l2x0_inv_range, 389 .clean_range = l2x0_clean_range, 390 .flush_range = l2x0_flush_range, 391 .flush_all = l2x0_flush_all, 392 .disable = l2x0_disable, 393 .sync = l2x0_cache_sync, 394 }, 395 }; 396 397 static void __init __l2c_init(const struct l2c_init_data *data, 398 u32 aux_val, u32 aux_mask, u32 cache_id) 399 { 400 u32 aux; 401 u32 way_size = 0; 402 int ways; 403 int way_size_shift = L2X0_WAY_SIZE_SHIFT; 404 const char *type; 405 406 /* 407 * It is strange to save the register state before initialisation, 408 * but hey, this is what the DT implementations decided to do. 409 */ 410 if (data->save) 411 data->save(l2x0_base); 412 413 aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL); 414 415 aux &= aux_mask; 416 aux |= aux_val; 417 418 /* Determine the number of ways */ 419 switch (cache_id & L2X0_CACHE_ID_PART_MASK) { 420 case L2X0_CACHE_ID_PART_L310: 421 if (aux & (1 << 16)) 422 ways = 16; 423 else 424 ways = 8; 425 type = "L310"; 426 #ifdef CONFIG_PL310_ERRATA_753970 427 /* Unmapped register. */ 428 sync_reg_offset = L2X0_DUMMY_REG; 429 #endif 430 break; 431 case L2X0_CACHE_ID_PART_L210: 432 ways = (aux >> 13) & 0xf; 433 type = "L210"; 434 break; 435 436 case AURORA_CACHE_ID: 437 sync_reg_offset = AURORA_SYNC_REG; 438 ways = (aux >> 13) & 0xf; 439 ways = 2 << ((ways + 1) >> 2); 440 way_size_shift = AURORA_WAY_SIZE_SHIFT; 441 type = "Aurora"; 442 break; 443 default: 444 /* Assume unknown chips have 8 ways */ 445 ways = 8; 446 type = "L2x0 series"; 447 break; 448 } 449 450 l2x0_way_mask = (1 << ways) - 1; 451 452 /* 453 * L2 cache Size = Way size * Number of ways 454 */ 455 way_size = (aux & L2X0_AUX_CTRL_WAY_SIZE_MASK) >> 17; 456 way_size = 1 << (way_size + way_size_shift); 457 458 l2x0_size = ways * way_size * SZ_1K; 459 460 /* 461 * Check if l2x0 controller is already enabled. If we are booting 462 * in non-secure mode accessing the below registers will fault. 463 */ 464 if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) 465 data->enable(l2x0_base, aux, data->num_lock); 466 467 /* Re-read it in case some bits are reserved. */ 468 aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL); 469 470 /* Save the value for resuming. */ 471 l2x0_saved_regs.aux_ctrl = aux; 472 473 outer_cache = data->outer_cache; 474 475 if ((cache_id & L2X0_CACHE_ID_PART_MASK) == L2X0_CACHE_ID_PART_L310 && 476 (cache_id & L2X0_CACHE_ID_RTL_MASK) <= L310_CACHE_ID_RTL_R3P0) 477 outer_cache.set_debug = pl310_set_debug; 478 479 pr_info("%s cache controller enabled\n", type); 480 pr_info("l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x, Cache size: %d kB\n", 481 ways, cache_id, aux, l2x0_size >> 10); 482 } 483 484 void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask) 485 { 486 u32 cache_id; 487 488 l2x0_base = base; 489 490 cache_id = readl_relaxed(base + L2X0_CACHE_ID); 491 492 __l2c_init(&l2x0_init_fns, aux_val, aux_mask, cache_id); 493 } 494 495 #ifdef CONFIG_OF 496 static int l2_wt_override; 497 498 /* Aurora don't have the cache ID register available, so we have to 499 * pass it though the device tree */ 500 static u32 cache_id_part_number_from_dt; 501 502 static void __init l2x0_of_parse(const struct device_node *np, 503 u32 *aux_val, u32 *aux_mask) 504 { 505 u32 data[2] = { 0, 0 }; 506 u32 tag = 0; 507 u32 dirty = 0; 508 u32 val = 0, mask = 0; 509 510 of_property_read_u32(np, "arm,tag-latency", &tag); 511 if (tag) { 512 mask |= L2X0_AUX_CTRL_TAG_LATENCY_MASK; 513 val |= (tag - 1) << L2X0_AUX_CTRL_TAG_LATENCY_SHIFT; 514 } 515 516 of_property_read_u32_array(np, "arm,data-latency", 517 data, ARRAY_SIZE(data)); 518 if (data[0] && data[1]) { 519 mask |= L2X0_AUX_CTRL_DATA_RD_LATENCY_MASK | 520 L2X0_AUX_CTRL_DATA_WR_LATENCY_MASK; 521 val |= ((data[0] - 1) << L2X0_AUX_CTRL_DATA_RD_LATENCY_SHIFT) | 522 ((data[1] - 1) << L2X0_AUX_CTRL_DATA_WR_LATENCY_SHIFT); 523 } 524 525 of_property_read_u32(np, "arm,dirty-latency", &dirty); 526 if (dirty) { 527 mask |= L2X0_AUX_CTRL_DIRTY_LATENCY_MASK; 528 val |= (dirty - 1) << L2X0_AUX_CTRL_DIRTY_LATENCY_SHIFT; 529 } 530 531 *aux_val &= ~mask; 532 *aux_val |= val; 533 *aux_mask &= ~mask; 534 } 535 536 static void l2x0_resume(void) 537 { 538 if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) { 539 /* restore aux ctrl and enable l2 */ 540 l2x0_unlock(readl_relaxed(l2x0_base + L2X0_CACHE_ID)); 541 542 writel_relaxed(l2x0_saved_regs.aux_ctrl, l2x0_base + 543 L2X0_AUX_CTRL); 544 545 l2x0_inv_all(); 546 547 writel_relaxed(L2X0_CTRL_EN, l2x0_base + L2X0_CTRL); 548 } 549 } 550 551 static const struct l2c_init_data of_l2x0_data __initconst = { 552 .of_parse = l2x0_of_parse, 553 .enable = l2x0_enable, 554 .outer_cache = { 555 .inv_range = l2x0_inv_range, 556 .clean_range = l2x0_clean_range, 557 .flush_range = l2x0_flush_range, 558 .flush_all = l2x0_flush_all, 559 .disable = l2x0_disable, 560 .sync = l2x0_cache_sync, 561 .resume = l2x0_resume, 562 }, 563 }; 564 565 static void __init pl310_of_parse(const struct device_node *np, 566 u32 *aux_val, u32 *aux_mask) 567 { 568 u32 data[3] = { 0, 0, 0 }; 569 u32 tag[3] = { 0, 0, 0 }; 570 u32 filter[2] = { 0, 0 }; 571 572 of_property_read_u32_array(np, "arm,tag-latency", tag, ARRAY_SIZE(tag)); 573 if (tag[0] && tag[1] && tag[2]) 574 writel_relaxed( 575 ((tag[0] - 1) << L2X0_LATENCY_CTRL_RD_SHIFT) | 576 ((tag[1] - 1) << L2X0_LATENCY_CTRL_WR_SHIFT) | 577 ((tag[2] - 1) << L2X0_LATENCY_CTRL_SETUP_SHIFT), 578 l2x0_base + L2X0_TAG_LATENCY_CTRL); 579 580 of_property_read_u32_array(np, "arm,data-latency", 581 data, ARRAY_SIZE(data)); 582 if (data[0] && data[1] && data[2]) 583 writel_relaxed( 584 ((data[0] - 1) << L2X0_LATENCY_CTRL_RD_SHIFT) | 585 ((data[1] - 1) << L2X0_LATENCY_CTRL_WR_SHIFT) | 586 ((data[2] - 1) << L2X0_LATENCY_CTRL_SETUP_SHIFT), 587 l2x0_base + L2X0_DATA_LATENCY_CTRL); 588 589 of_property_read_u32_array(np, "arm,filter-ranges", 590 filter, ARRAY_SIZE(filter)); 591 if (filter[1]) { 592 writel_relaxed(ALIGN(filter[0] + filter[1], SZ_1M), 593 l2x0_base + L2X0_ADDR_FILTER_END); 594 writel_relaxed((filter[0] & ~(SZ_1M - 1)) | L2X0_ADDR_FILTER_EN, 595 l2x0_base + L2X0_ADDR_FILTER_START); 596 } 597 } 598 599 static void __init pl310_save(void __iomem *base) 600 { 601 u32 l2x0_revision = readl_relaxed(base + L2X0_CACHE_ID) & 602 L2X0_CACHE_ID_RTL_MASK; 603 604 l2x0_saved_regs.tag_latency = readl_relaxed(base + 605 L2X0_TAG_LATENCY_CTRL); 606 l2x0_saved_regs.data_latency = readl_relaxed(base + 607 L2X0_DATA_LATENCY_CTRL); 608 l2x0_saved_regs.filter_end = readl_relaxed(base + 609 L2X0_ADDR_FILTER_END); 610 l2x0_saved_regs.filter_start = readl_relaxed(base + 611 L2X0_ADDR_FILTER_START); 612 613 if (l2x0_revision >= L310_CACHE_ID_RTL_R2P0) { 614 /* 615 * From r2p0, there is Prefetch offset/control register 616 */ 617 l2x0_saved_regs.prefetch_ctrl = readl_relaxed(base + 618 L2X0_PREFETCH_CTRL); 619 /* 620 * From r3p0, there is Power control register 621 */ 622 if (l2x0_revision >= L310_CACHE_ID_RTL_R3P0) 623 l2x0_saved_regs.pwr_ctrl = readl_relaxed(base + 624 L2X0_POWER_CTRL); 625 } 626 } 627 628 static void pl310_resume(void) 629 { 630 u32 l2x0_revision; 631 632 if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) { 633 /* restore pl310 setup */ 634 writel_relaxed(l2x0_saved_regs.tag_latency, 635 l2x0_base + L2X0_TAG_LATENCY_CTRL); 636 writel_relaxed(l2x0_saved_regs.data_latency, 637 l2x0_base + L2X0_DATA_LATENCY_CTRL); 638 writel_relaxed(l2x0_saved_regs.filter_end, 639 l2x0_base + L2X0_ADDR_FILTER_END); 640 writel_relaxed(l2x0_saved_regs.filter_start, 641 l2x0_base + L2X0_ADDR_FILTER_START); 642 643 l2x0_revision = readl_relaxed(l2x0_base + L2X0_CACHE_ID) & 644 L2X0_CACHE_ID_RTL_MASK; 645 646 if (l2x0_revision >= L310_CACHE_ID_RTL_R2P0) { 647 writel_relaxed(l2x0_saved_regs.prefetch_ctrl, 648 l2x0_base + L2X0_PREFETCH_CTRL); 649 if (l2x0_revision >= L310_CACHE_ID_RTL_R3P0) 650 writel_relaxed(l2x0_saved_regs.pwr_ctrl, 651 l2x0_base + L2X0_POWER_CTRL); 652 } 653 } 654 655 l2x0_resume(); 656 } 657 658 static const struct l2c_init_data of_pl310_data __initconst = { 659 .num_lock = 8, 660 .of_parse = pl310_of_parse, 661 .enable = l2c_enable, 662 .save = pl310_save, 663 .outer_cache = { 664 .inv_range = l2x0_inv_range, 665 .clean_range = l2x0_clean_range, 666 .flush_range = l2x0_flush_range, 667 .flush_all = l2x0_flush_all, 668 .disable = l2x0_disable, 669 .sync = l2x0_cache_sync, 670 .resume = pl310_resume, 671 }, 672 }; 673 674 /* 675 * Note that the end addresses passed to Linux primitives are 676 * noninclusive, while the hardware cache range operations use 677 * inclusive start and end addresses. 678 */ 679 static unsigned long calc_range_end(unsigned long start, unsigned long end) 680 { 681 /* 682 * Limit the number of cache lines processed at once, 683 * since cache range operations stall the CPU pipeline 684 * until completion. 685 */ 686 if (end > start + MAX_RANGE_SIZE) 687 end = start + MAX_RANGE_SIZE; 688 689 /* 690 * Cache range operations can't straddle a page boundary. 691 */ 692 if (end > PAGE_ALIGN(start+1)) 693 end = PAGE_ALIGN(start+1); 694 695 return end; 696 } 697 698 /* 699 * Make sure 'start' and 'end' reference the same page, as L2 is PIPT 700 * and range operations only do a TLB lookup on the start address. 701 */ 702 static void aurora_pa_range(unsigned long start, unsigned long end, 703 unsigned long offset) 704 { 705 unsigned long flags; 706 707 raw_spin_lock_irqsave(&l2x0_lock, flags); 708 writel_relaxed(start, l2x0_base + AURORA_RANGE_BASE_ADDR_REG); 709 writel_relaxed(end, l2x0_base + offset); 710 raw_spin_unlock_irqrestore(&l2x0_lock, flags); 711 712 cache_sync(); 713 } 714 715 static void aurora_inv_range(unsigned long start, unsigned long end) 716 { 717 /* 718 * round start and end adresses up to cache line size 719 */ 720 start &= ~(CACHE_LINE_SIZE - 1); 721 end = ALIGN(end, CACHE_LINE_SIZE); 722 723 /* 724 * Invalidate all full cache lines between 'start' and 'end'. 725 */ 726 while (start < end) { 727 unsigned long range_end = calc_range_end(start, end); 728 aurora_pa_range(start, range_end - CACHE_LINE_SIZE, 729 AURORA_INVAL_RANGE_REG); 730 start = range_end; 731 } 732 } 733 734 static void aurora_clean_range(unsigned long start, unsigned long end) 735 { 736 /* 737 * If L2 is forced to WT, the L2 will always be clean and we 738 * don't need to do anything here. 739 */ 740 if (!l2_wt_override) { 741 start &= ~(CACHE_LINE_SIZE - 1); 742 end = ALIGN(end, CACHE_LINE_SIZE); 743 while (start != end) { 744 unsigned long range_end = calc_range_end(start, end); 745 aurora_pa_range(start, range_end - CACHE_LINE_SIZE, 746 AURORA_CLEAN_RANGE_REG); 747 start = range_end; 748 } 749 } 750 } 751 752 static void aurora_flush_range(unsigned long start, unsigned long end) 753 { 754 start &= ~(CACHE_LINE_SIZE - 1); 755 end = ALIGN(end, CACHE_LINE_SIZE); 756 while (start != end) { 757 unsigned long range_end = calc_range_end(start, end); 758 /* 759 * If L2 is forced to WT, the L2 will always be clean and we 760 * just need to invalidate. 761 */ 762 if (l2_wt_override) 763 aurora_pa_range(start, range_end - CACHE_LINE_SIZE, 764 AURORA_INVAL_RANGE_REG); 765 else 766 aurora_pa_range(start, range_end - CACHE_LINE_SIZE, 767 AURORA_FLUSH_RANGE_REG); 768 start = range_end; 769 } 770 } 771 772 static void aurora_save(void __iomem *base) 773 { 774 l2x0_saved_regs.ctrl = readl_relaxed(base + L2X0_CTRL); 775 l2x0_saved_regs.aux_ctrl = readl_relaxed(base + L2X0_AUX_CTRL); 776 } 777 778 static void aurora_resume(void) 779 { 780 if (!(readl(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) { 781 writel_relaxed(l2x0_saved_regs.aux_ctrl, 782 l2x0_base + L2X0_AUX_CTRL); 783 writel_relaxed(l2x0_saved_regs.ctrl, l2x0_base + L2X0_CTRL); 784 } 785 } 786 787 static void __init aurora_broadcast_l2_commands(void) 788 { 789 __u32 u; 790 /* Enable Broadcasting of cache commands to L2*/ 791 __asm__ __volatile__("mrc p15, 1, %0, c15, c2, 0" : "=r"(u)); 792 u |= AURORA_CTRL_FW; /* Set the FW bit */ 793 __asm__ __volatile__("mcr p15, 1, %0, c15, c2, 0\n" : : "r"(u)); 794 isb(); 795 } 796 797 static void __init aurora_of_parse(const struct device_node *np, 798 u32 *aux_val, u32 *aux_mask) 799 { 800 u32 val = AURORA_ACR_REPLACEMENT_TYPE_SEMIPLRU; 801 u32 mask = AURORA_ACR_REPLACEMENT_MASK; 802 803 of_property_read_u32(np, "cache-id-part", 804 &cache_id_part_number_from_dt); 805 806 /* Determine and save the write policy */ 807 l2_wt_override = of_property_read_bool(np, "wt-override"); 808 809 if (l2_wt_override) { 810 val |= AURORA_ACR_FORCE_WRITE_THRO_POLICY; 811 mask |= AURORA_ACR_FORCE_WRITE_POLICY_MASK; 812 } 813 814 *aux_val &= ~mask; 815 *aux_val |= val; 816 *aux_mask &= ~mask; 817 } 818 819 static const struct l2c_init_data of_aurora_with_outer_data __initconst = { 820 .num_lock = 4, 821 .of_parse = aurora_of_parse, 822 .enable = l2c_enable, 823 .save = aurora_save, 824 .outer_cache = { 825 .inv_range = aurora_inv_range, 826 .clean_range = aurora_clean_range, 827 .flush_range = aurora_flush_range, 828 .flush_all = l2x0_flush_all, 829 .disable = l2x0_disable, 830 .sync = l2x0_cache_sync, 831 .resume = aurora_resume, 832 }, 833 }; 834 835 static const struct l2c_init_data of_aurora_no_outer_data __initconst = { 836 .num_lock = 4, 837 .of_parse = aurora_of_parse, 838 .enable = l2c_enable, 839 .save = aurora_save, 840 .outer_cache = { 841 .resume = aurora_resume, 842 }, 843 }; 844 845 /* 846 * For certain Broadcom SoCs, depending on the address range, different offsets 847 * need to be added to the address before passing it to L2 for 848 * invalidation/clean/flush 849 * 850 * Section Address Range Offset EMI 851 * 1 0x00000000 - 0x3FFFFFFF 0x80000000 VC 852 * 2 0x40000000 - 0xBFFFFFFF 0x40000000 SYS 853 * 3 0xC0000000 - 0xFFFFFFFF 0x80000000 VC 854 * 855 * When the start and end addresses have crossed two different sections, we 856 * need to break the L2 operation into two, each within its own section. 857 * For example, if we need to invalidate addresses starts at 0xBFFF0000 and 858 * ends at 0xC0001000, we need do invalidate 1) 0xBFFF0000 - 0xBFFFFFFF and 2) 859 * 0xC0000000 - 0xC0001000 860 * 861 * Note 1: 862 * By breaking a single L2 operation into two, we may potentially suffer some 863 * performance hit, but keep in mind the cross section case is very rare 864 * 865 * Note 2: 866 * We do not need to handle the case when the start address is in 867 * Section 1 and the end address is in Section 3, since it is not a valid use 868 * case 869 * 870 * Note 3: 871 * Section 1 in practical terms can no longer be used on rev A2. Because of 872 * that the code does not need to handle section 1 at all. 873 * 874 */ 875 #define BCM_SYS_EMI_START_ADDR 0x40000000UL 876 #define BCM_VC_EMI_SEC3_START_ADDR 0xC0000000UL 877 878 #define BCM_SYS_EMI_OFFSET 0x40000000UL 879 #define BCM_VC_EMI_OFFSET 0x80000000UL 880 881 static inline int bcm_addr_is_sys_emi(unsigned long addr) 882 { 883 return (addr >= BCM_SYS_EMI_START_ADDR) && 884 (addr < BCM_VC_EMI_SEC3_START_ADDR); 885 } 886 887 static inline unsigned long bcm_l2_phys_addr(unsigned long addr) 888 { 889 if (bcm_addr_is_sys_emi(addr)) 890 return addr + BCM_SYS_EMI_OFFSET; 891 else 892 return addr + BCM_VC_EMI_OFFSET; 893 } 894 895 static void bcm_inv_range(unsigned long start, unsigned long end) 896 { 897 unsigned long new_start, new_end; 898 899 BUG_ON(start < BCM_SYS_EMI_START_ADDR); 900 901 if (unlikely(end <= start)) 902 return; 903 904 new_start = bcm_l2_phys_addr(start); 905 new_end = bcm_l2_phys_addr(end); 906 907 /* normal case, no cross section between start and end */ 908 if (likely(bcm_addr_is_sys_emi(end) || !bcm_addr_is_sys_emi(start))) { 909 l2x0_inv_range(new_start, new_end); 910 return; 911 } 912 913 /* They cross sections, so it can only be a cross from section 914 * 2 to section 3 915 */ 916 l2x0_inv_range(new_start, 917 bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR-1)); 918 l2x0_inv_range(bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR), 919 new_end); 920 } 921 922 static void bcm_clean_range(unsigned long start, unsigned long end) 923 { 924 unsigned long new_start, new_end; 925 926 BUG_ON(start < BCM_SYS_EMI_START_ADDR); 927 928 if (unlikely(end <= start)) 929 return; 930 931 if ((end - start) >= l2x0_size) { 932 l2x0_clean_all(); 933 return; 934 } 935 936 new_start = bcm_l2_phys_addr(start); 937 new_end = bcm_l2_phys_addr(end); 938 939 /* normal case, no cross section between start and end */ 940 if (likely(bcm_addr_is_sys_emi(end) || !bcm_addr_is_sys_emi(start))) { 941 l2x0_clean_range(new_start, new_end); 942 return; 943 } 944 945 /* They cross sections, so it can only be a cross from section 946 * 2 to section 3 947 */ 948 l2x0_clean_range(new_start, 949 bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR-1)); 950 l2x0_clean_range(bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR), 951 new_end); 952 } 953 954 static void bcm_flush_range(unsigned long start, unsigned long end) 955 { 956 unsigned long new_start, new_end; 957 958 BUG_ON(start < BCM_SYS_EMI_START_ADDR); 959 960 if (unlikely(end <= start)) 961 return; 962 963 if ((end - start) >= l2x0_size) { 964 l2x0_flush_all(); 965 return; 966 } 967 968 new_start = bcm_l2_phys_addr(start); 969 new_end = bcm_l2_phys_addr(end); 970 971 /* normal case, no cross section between start and end */ 972 if (likely(bcm_addr_is_sys_emi(end) || !bcm_addr_is_sys_emi(start))) { 973 l2x0_flush_range(new_start, new_end); 974 return; 975 } 976 977 /* They cross sections, so it can only be a cross from section 978 * 2 to section 3 979 */ 980 l2x0_flush_range(new_start, 981 bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR-1)); 982 l2x0_flush_range(bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR), 983 new_end); 984 } 985 986 static const struct l2c_init_data of_bcm_l2x0_data __initconst = { 987 .num_lock = 8, 988 .of_parse = pl310_of_parse, 989 .enable = l2c_enable, 990 .save = pl310_save, 991 .outer_cache = { 992 .inv_range = bcm_inv_range, 993 .clean_range = bcm_clean_range, 994 .flush_range = bcm_flush_range, 995 .flush_all = l2x0_flush_all, 996 .disable = l2x0_disable, 997 .sync = l2x0_cache_sync, 998 .resume = pl310_resume, 999 }, 1000 }; 1001 1002 static void __init tauros3_save(void __iomem *base) 1003 { 1004 l2x0_saved_regs.aux2_ctrl = 1005 readl_relaxed(base + TAUROS3_AUX2_CTRL); 1006 l2x0_saved_regs.prefetch_ctrl = 1007 readl_relaxed(base + L2X0_PREFETCH_CTRL); 1008 } 1009 1010 static void tauros3_resume(void) 1011 { 1012 if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) { 1013 writel_relaxed(l2x0_saved_regs.aux2_ctrl, 1014 l2x0_base + TAUROS3_AUX2_CTRL); 1015 writel_relaxed(l2x0_saved_regs.prefetch_ctrl, 1016 l2x0_base + L2X0_PREFETCH_CTRL); 1017 } 1018 1019 l2x0_resume(); 1020 } 1021 1022 static const struct l2c_init_data of_tauros3_data __initconst = { 1023 .num_lock = 8, 1024 .enable = l2c_enable, 1025 .save = tauros3_save, 1026 /* Tauros3 broadcasts L1 cache operations to L2 */ 1027 .outer_cache = { 1028 .resume = tauros3_resume, 1029 }, 1030 }; 1031 1032 #define L2C_ID(name, fns) { .compatible = name, .data = (void *)&fns } 1033 static const struct of_device_id l2x0_ids[] __initconst = { 1034 L2C_ID("arm,l210-cache", of_l2x0_data), 1035 L2C_ID("arm,l220-cache", of_l2x0_data), 1036 L2C_ID("arm,pl310-cache", of_pl310_data), 1037 L2C_ID("brcm,bcm11351-a2-pl310-cache", of_bcm_l2x0_data), 1038 L2C_ID("marvell,aurora-outer-cache", of_aurora_with_outer_data), 1039 L2C_ID("marvell,aurora-system-cache", of_aurora_no_outer_data), 1040 L2C_ID("marvell,tauros3-cache", of_tauros3_data), 1041 /* Deprecated IDs */ 1042 L2C_ID("bcm,bcm11351-a2-pl310-cache", of_bcm_l2x0_data), 1043 {} 1044 }; 1045 1046 int __init l2x0_of_init(u32 aux_val, u32 aux_mask) 1047 { 1048 const struct l2c_init_data *data; 1049 struct device_node *np; 1050 struct resource res; 1051 u32 cache_id; 1052 1053 np = of_find_matching_node(NULL, l2x0_ids); 1054 if (!np) 1055 return -ENODEV; 1056 1057 if (of_address_to_resource(np, 0, &res)) 1058 return -ENODEV; 1059 1060 l2x0_base = ioremap(res.start, resource_size(&res)); 1061 if (!l2x0_base) 1062 return -ENOMEM; 1063 1064 l2x0_saved_regs.phy_base = res.start; 1065 1066 data = of_match_node(l2x0_ids, np)->data; 1067 1068 /* L2 configuration can only be changed if the cache is disabled */ 1069 if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) { 1070 if (data->of_parse) 1071 data->of_parse(np, &aux_val, &aux_mask); 1072 1073 /* For aurora cache in no outer mode select the 1074 * correct mode using the coprocessor*/ 1075 if (data == &of_aurora_no_outer_data) 1076 aurora_broadcast_l2_commands(); 1077 } 1078 1079 if (cache_id_part_number_from_dt) 1080 cache_id = cache_id_part_number_from_dt; 1081 else 1082 cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID); 1083 1084 __l2c_init(data, aux_val, aux_mask, cache_id); 1085 1086 return 0; 1087 } 1088 #endif 1089