arch/arm/mm/cache-l2x0.c

   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-aurora-l2.h"
  29
  30 #define CACHE_LINE_SIZE         32
  31
  32 static void __iomem *l2x0_base;
  33 static DEFINE_RAW_SPINLOCK(l2x0_lock);
  34 static u32 l2x0_way_mask;       /* Bitmask of active ways */
  35 static u32 l2x0_size;
  36 static unsigned long sync_reg_offset = L2X0_CACHE_SYNC;
  37
  38 /* Aurora don't have the cache ID register available, so we have to
  39  * pass it though the device tree */
  40 static u32  cache_id_part_number_from_dt;
  41
  42 struct l2x0_regs l2x0_saved_regs;
  43
  44 struct l2x0_of_data {
  45         void (*setup)(const struct device_node *, u32 *, u32 *);
  46         void (*save)(void);
  47         struct outer_cache_fns outer_cache;
  48 };
  49
  50 static bool of_init = false;
  51
  52 static inline void cache_wait_way(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 #ifdef CONFIG_CACHE_PL310
  60 static inline void cache_wait(void __iomem *reg, unsigned long mask)
  61 {
  62         /* cache operations by line are atomic on PL310 */
  63 }
  64 #else
  65 #define cache_wait      cache_wait_way
  66 #endif
  67
  68 static inline void cache_sync(void)
  69 {
  70         void __iomem *base = l2x0_base;
  71
  72         writel_relaxed(0, base + sync_reg_offset);
  73         cache_wait(base + L2X0_CACHE_SYNC, 1);
  74 }
  75
  76 static inline void l2x0_clean_line(unsigned long addr)
  77 {
  78         void __iomem *base = l2x0_base;
  79         cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
  80         writel_relaxed(addr, base + L2X0_CLEAN_LINE_PA);
  81 }
  82
  83 static inline void l2x0_inv_line(unsigned long addr)
  84 {
  85         void __iomem *base = l2x0_base;
  86         cache_wait(base + L2X0_INV_LINE_PA, 1);
  87         writel_relaxed(addr, base + L2X0_INV_LINE_PA);
  88 }
  89
  90 #if defined(CONFIG_PL310_ERRATA_588369) || defined(CONFIG_PL310_ERRATA_727915)
  91 static inline void debug_writel(unsigned long val)
  92 {
  93         if (outer_cache.set_debug)
  94                 outer_cache.set_debug(val);
  95 }
  96
  97 static void pl310_set_debug(unsigned long val)
  98 {
  99         writel_relaxed(val, l2x0_base + L2X0_DEBUG_CTRL);
 100 }
 101 #else
 102 /* Optimised out for non-errata case */
 103 static inline void debug_writel(unsigned long val)
 104 {
 105 }
 106
 107 #define pl310_set_debug NULL
 108 #endif
 109
 110 #ifdef CONFIG_PL310_ERRATA_588369
 111 static inline void l2x0_flush_line(unsigned long addr)
 112 {
 113         void __iomem *base = l2x0_base;
 114
 115         /* Clean by PA followed by Invalidate by PA */
 116         cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
 117         writel_relaxed(addr, base + L2X0_CLEAN_LINE_PA);
 118         cache_wait(base + L2X0_INV_LINE_PA, 1);
 119         writel_relaxed(addr, base + L2X0_INV_LINE_PA);
 120 }
 121 #else
 122
 123 static inline void l2x0_flush_line(unsigned long addr)
 124 {
 125         void __iomem *base = l2x0_base;
 126         cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
 127         writel_relaxed(addr, base + L2X0_CLEAN_INV_LINE_PA);
 128 }
 129 #endif
 130
 131 static void l2x0_cache_sync(void)
 132 {
 133         unsigned long flags;
 134
 135         raw_spin_lock_irqsave(&l2x0_lock, flags);
 136         cache_sync();
 137         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 138 }
 139
 140 static void __l2x0_flush_all(void)
 141 {
 142         debug_writel(0x03);
 143         writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_INV_WAY);
 144         cache_wait_way(l2x0_base + L2X0_CLEAN_INV_WAY, l2x0_way_mask);
 145         cache_sync();
 146         debug_writel(0x00);
 147 }
 148
 149 static void l2x0_flush_all(void)
 150 {
 151         unsigned long flags;
 152
 153         /* clean all ways */
 154         raw_spin_lock_irqsave(&l2x0_lock, flags);
 155         __l2x0_flush_all();
 156         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 157 }
 158
 159 static void l2x0_clean_all(void)
 160 {
 161         unsigned long flags;
 162
 163         /* clean all ways */
 164         raw_spin_lock_irqsave(&l2x0_lock, flags);
 165         writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_WAY);
 166         cache_wait_way(l2x0_base + L2X0_CLEAN_WAY, l2x0_way_mask);
 167         cache_sync();
 168         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 169 }
 170
 171 static void l2x0_inv_all(void)
 172 {
 173         unsigned long flags;
 174
 175         /* invalidate all ways */
 176         raw_spin_lock_irqsave(&l2x0_lock, flags);
 177         /* Invalidating when L2 is enabled is a nono */
 178         BUG_ON(readl(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN);
 179         writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
 180         cache_wait_way(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
 181         cache_sync();
 182         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 183 }
 184
 185 static void l2x0_inv_range(unsigned long start, unsigned long end)
 186 {
 187         void __iomem *base = l2x0_base;
 188         unsigned long flags;
 189
 190         raw_spin_lock_irqsave(&l2x0_lock, flags);
 191         if (start & (CACHE_LINE_SIZE - 1)) {
 192                 start &= ~(CACHE_LINE_SIZE - 1);
 193                 debug_writel(0x03);
 194                 l2x0_flush_line(start);
 195                 debug_writel(0x00);
 196                 start += CACHE_LINE_SIZE;
 197         }
 198
 199         if (end & (CACHE_LINE_SIZE - 1)) {
 200                 end &= ~(CACHE_LINE_SIZE - 1);
 201                 debug_writel(0x03);
 202                 l2x0_flush_line(end);
 203                 debug_writel(0x00);
 204         }
 205
 206         while (start < end) {
 207                 unsigned long blk_end = start + min(end - start, 4096UL);
 208
 209                 while (start < blk_end) {
 210                         l2x0_inv_line(start);
 211                         start += CACHE_LINE_SIZE;
 212                 }
 213
 214                 if (blk_end < end) {
 215                         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 216                         raw_spin_lock_irqsave(&l2x0_lock, flags);
 217                 }
 218         }
 219         cache_wait(base + L2X0_INV_LINE_PA, 1);
 220         cache_sync();
 221         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 222 }
 223
 224 static void l2x0_clean_range(unsigned long start, unsigned long end)
 225 {
 226         void __iomem *base = l2x0_base;
 227         unsigned long flags;
 228
 229         if ((end - start) >= l2x0_size) {
 230                 l2x0_clean_all();
 231                 return;
 232         }
 233
 234         raw_spin_lock_irqsave(&l2x0_lock, flags);
 235         start &= ~(CACHE_LINE_SIZE - 1);
 236         while (start < end) {
 237                 unsigned long blk_end = start + min(end - start, 4096UL);
 238
 239                 while (start < blk_end) {
 240                         l2x0_clean_line(start);
 241                         start += CACHE_LINE_SIZE;
 242                 }
 243
 244                 if (blk_end < end) {
 245                         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 246                         raw_spin_lock_irqsave(&l2x0_lock, flags);
 247                 }
 248         }
 249         cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
 250         cache_sync();
 251         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 252 }
 253
 254 static void l2x0_flush_range(unsigned long start, unsigned long end)
 255 {
 256         void __iomem *base = l2x0_base;
 257         unsigned long flags;
 258
 259         if ((end - start) >= l2x0_size) {
 260                 l2x0_flush_all();
 261                 return;
 262         }
 263
 264         raw_spin_lock_irqsave(&l2x0_lock, flags);
 265         start &= ~(CACHE_LINE_SIZE - 1);
 266         while (start < end) {
 267                 unsigned long blk_end = start + min(end - start, 4096UL);
 268
 269                 debug_writel(0x03);
 270                 while (start < blk_end) {
 271                         l2x0_flush_line(start);
 272                         start += CACHE_LINE_SIZE;
 273                 }
 274                 debug_writel(0x00);
 275
 276                 if (blk_end < end) {
 277                         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 278                         raw_spin_lock_irqsave(&l2x0_lock, flags);
 279                 }
 280         }
 281         cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
 282         cache_sync();
 283         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 284 }
 285
 286 static void l2x0_disable(void)
 287 {
 288         unsigned long flags;
 289
 290         raw_spin_lock_irqsave(&l2x0_lock, flags);
 291         __l2x0_flush_all();
 292         writel_relaxed(0, l2x0_base + L2X0_CTRL);
 293         dsb();
 294         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 295 }
 296
 297 static void l2x0_unlock(u32 cache_id)
 298 {
 299         int lockregs;
 300         int i;
 301
 302         switch (cache_id & L2X0_CACHE_ID_PART_MASK) {
 303         case L2X0_CACHE_ID_PART_L310:
 304                 lockregs = 8;
 305                 break;
 306         case AURORA_CACHE_ID:
 307                 lockregs = 4;
 308                 break;
 309         default:
 310                 /* L210 and unknown types */
 311                 lockregs = 1;
 312                 break;
 313         }
 314
 315         for (i = 0; i < lockregs; i++) {
 316                 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE +
 317                                i * L2X0_LOCKDOWN_STRIDE);
 318                 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE +
 319                                i * L2X0_LOCKDOWN_STRIDE);
 320         }
 321 }
 322
 323 void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
 324 {
 325         u32 aux;
 326         u32 cache_id;
 327         u32 way_size = 0;
 328         int ways;
 329         int way_size_shift = L2X0_WAY_SIZE_SHIFT;
 330         const char *type;
 331
 332         l2x0_base = base;
 333         if (cache_id_part_number_from_dt)
 334                 cache_id = cache_id_part_number_from_dt;
 335         else
 336                 cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
 337         aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 338
 339         aux &= aux_mask;
 340         aux |= aux_val;
 341
 342         /* Determine the number of ways */
 343         switch (cache_id & L2X0_CACHE_ID_PART_MASK) {
 344         case L2X0_CACHE_ID_PART_L310:
 345                 if (aux & (1 << 16))
 346                         ways = 16;
 347                 else
 348                         ways = 8;
 349                 type = "L310";
 350 #ifdef CONFIG_PL310_ERRATA_753970
 351                 /* Unmapped register. */
 352                 sync_reg_offset = L2X0_DUMMY_REG;
 353 #endif
 354                 if ((cache_id & L2X0_CACHE_ID_RTL_MASK) <= L2X0_CACHE_ID_RTL_R3P0)
 355                         outer_cache.set_debug = pl310_set_debug;
 356                 break;
 357         case L2X0_CACHE_ID_PART_L210:
 358                 ways = (aux >> 13) & 0xf;
 359                 type = "L210";
 360                 break;
 361
 362         case AURORA_CACHE_ID:
 363                 sync_reg_offset = AURORA_SYNC_REG;
 364                 ways = (aux >> 13) & 0xf;
 365                 ways = 2 << ((ways + 1) >> 2);
 366                 way_size_shift = AURORA_WAY_SIZE_SHIFT;
 367                 type = "Aurora";
 368                 break;
 369         default:
 370                 /* Assume unknown chips have 8 ways */
 371                 ways = 8;
 372                 type = "L2x0 series";
 373                 break;
 374         }
 375
 376         l2x0_way_mask = (1 << ways) - 1;
 377
 378         /*
 379          * L2 cache Size =  Way size * Number of ways
 380          */
 381         way_size = (aux & L2X0_AUX_CTRL_WAY_SIZE_MASK) >> 17;
 382         way_size = 1 << (way_size + way_size_shift);
 383
 384         l2x0_size = ways * way_size * SZ_1K;
 385
 386         /*
 387          * Check if l2x0 controller is already enabled.
 388          * If you are booting from non-secure mode
 389          * accessing the below registers will fault.
 390          */
 391         if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
 392                 /* Make sure that I&D is not locked down when starting */
 393                 l2x0_unlock(cache_id);
 394
 395                 /* l2x0 controller is disabled */
 396                 writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
 397
 398                 l2x0_inv_all();
 399
 400                 /* enable L2X0 */
 401                 writel_relaxed(L2X0_CTRL_EN, l2x0_base + L2X0_CTRL);
 402         }
 403
 404         /* Re-read it in case some bits are reserved. */
 405         aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 406
 407         /* Save the value for resuming. */
 408         l2x0_saved_regs.aux_ctrl = aux;
 409
 410         if (!of_init) {
 411                 outer_cache.inv_range = l2x0_inv_range;
 412                 outer_cache.clean_range = l2x0_clean_range;
 413                 outer_cache.flush_range = l2x0_flush_range;
 414                 outer_cache.sync = l2x0_cache_sync;
 415                 outer_cache.flush_all = l2x0_flush_all;
 416                 outer_cache.inv_all = l2x0_inv_all;
 417                 outer_cache.disable = l2x0_disable;
 418         }
 419
 420         printk(KERN_INFO "%s cache controller enabled\n", type);
 421         printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x, Cache size: %d B\n",
 422                         ways, cache_id, aux, l2x0_size);
 423 }
 424
 425 #ifdef CONFIG_OF
 426 static int l2_wt_override;
 427
 428 /*
 429  * Note that the end addresses passed to Linux primitives are
 430  * noninclusive, while the hardware cache range operations use
 431  * inclusive start and end addresses.
 432  */
 433 static unsigned long calc_range_end(unsigned long start, unsigned long end)
 434 {
 435         /*
 436          * Limit the number of cache lines processed at once,
 437          * since cache range operations stall the CPU pipeline
 438          * until completion.
 439          */
 440         if (end > start + MAX_RANGE_SIZE)
 441                 end = start + MAX_RANGE_SIZE;
 442
 443         /*
 444          * Cache range operations can't straddle a page boundary.
 445          */
 446         if (end > PAGE_ALIGN(start+1))
 447                 end = PAGE_ALIGN(start+1);
 448
 449         return end;
 450 }
 451
 452 /*
 453  * Make sure 'start' and 'end' reference the same page, as L2 is PIPT
 454  * and range operations only do a TLB lookup on the start address.
 455  */
 456 static void aurora_pa_range(unsigned long start, unsigned long end,
 457                         unsigned long offset)
 458 {
 459         unsigned long flags;
 460
 461         raw_spin_lock_irqsave(&l2x0_lock, flags);
 462         writel_relaxed(start, l2x0_base + AURORA_RANGE_BASE_ADDR_REG);
 463         writel_relaxed(end, l2x0_base + offset);
 464         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 465
 466         cache_sync();
 467 }
 468
 469 static void aurora_inv_range(unsigned long start, unsigned long end)
 470 {
 471         /*
 472          * round start and end adresses up to cache line size
 473          */
 474         start &= ~(CACHE_LINE_SIZE - 1);
 475         end = ALIGN(end, CACHE_LINE_SIZE);
 476
 477         /*
 478          * Invalidate all full cache lines between 'start' and 'end'.
 479          */
 480         while (start < end) {
 481                 unsigned long range_end = calc_range_end(start, end);
 482                 aurora_pa_range(start, range_end - CACHE_LINE_SIZE,
 483                                 AURORA_INVAL_RANGE_REG);
 484                 start = range_end;
 485         }
 486 }
 487
 488 static void aurora_clean_range(unsigned long start, unsigned long end)
 489 {
 490         /*
 491          * If L2 is forced to WT, the L2 will always be clean and we
 492          * don't need to do anything here.
 493          */
 494         if (!l2_wt_override) {
 495                 start &= ~(CACHE_LINE_SIZE - 1);
 496                 end = ALIGN(end, CACHE_LINE_SIZE);
 497                 while (start != end) {
 498                         unsigned long range_end = calc_range_end(start, end);
 499                         aurora_pa_range(start, range_end - CACHE_LINE_SIZE,
 500                                         AURORA_CLEAN_RANGE_REG);
 501                         start = range_end;
 502                 }
 503         }
 504 }
 505
 506 static void aurora_flush_range(unsigned long start, unsigned long end)
 507 {
 508         start &= ~(CACHE_LINE_SIZE - 1);
 509         end = ALIGN(end, CACHE_LINE_SIZE);
 510         while (start != end) {
 511                 unsigned long range_end = calc_range_end(start, end);
 512                 /*
 513                  * If L2 is forced to WT, the L2 will always be clean and we
 514                  * just need to invalidate.
 515                  */
 516                 if (l2_wt_override)
 517                         aurora_pa_range(start, range_end - CACHE_LINE_SIZE,
 518                                                         AURORA_INVAL_RANGE_REG);
 519                 else
 520                         aurora_pa_range(start, range_end - CACHE_LINE_SIZE,
 521                                                         AURORA_FLUSH_RANGE_REG);
 522                 start = range_end;
 523         }
 524 }
 525
 526 static void __init l2x0_of_setup(const struct device_node *np,
 527                                  u32 *aux_val, u32 *aux_mask)
 528 {
 529         u32 data[2] = { 0, 0 };
 530         u32 tag = 0;
 531         u32 dirty = 0;
 532         u32 val = 0, mask = 0;
 533
 534         of_property_read_u32(np, "arm,tag-latency", &tag);
 535         if (tag) {
 536                 mask |= L2X0_AUX_CTRL_TAG_LATENCY_MASK;
 537                 val |= (tag - 1) << L2X0_AUX_CTRL_TAG_LATENCY_SHIFT;
 538         }
 539
 540         of_property_read_u32_array(np, "arm,data-latency",
 541                                    data, ARRAY_SIZE(data));
 542         if (data[0] && data[1]) {
 543                 mask |= L2X0_AUX_CTRL_DATA_RD_LATENCY_MASK |
 544                         L2X0_AUX_CTRL_DATA_WR_LATENCY_MASK;
 545                 val |= ((data[0] - 1) << L2X0_AUX_CTRL_DATA_RD_LATENCY_SHIFT) |
 546                        ((data[1] - 1) << L2X0_AUX_CTRL_DATA_WR_LATENCY_SHIFT);
 547         }
 548
 549         of_property_read_u32(np, "arm,dirty-latency", &dirty);
 550         if (dirty) {
 551                 mask |= L2X0_AUX_CTRL_DIRTY_LATENCY_MASK;
 552                 val |= (dirty - 1) << L2X0_AUX_CTRL_DIRTY_LATENCY_SHIFT;
 553         }
 554
 555         *aux_val &= ~mask;
 556         *aux_val |= val;
 557         *aux_mask &= ~mask;
 558 }
 559
 560 static void __init pl310_of_setup(const struct device_node *np,
 561                                   u32 *aux_val, u32 *aux_mask)
 562 {
 563         u32 data[3] = { 0, 0, 0 };
 564         u32 tag[3] = { 0, 0, 0 };
 565         u32 filter[2] = { 0, 0 };
 566
 567         of_property_read_u32_array(np, "arm,tag-latency", tag, ARRAY_SIZE(tag));
 568         if (tag[0] && tag[1] && tag[2])
 569                 writel_relaxed(
 570                         ((tag[0] - 1) << L2X0_LATENCY_CTRL_RD_SHIFT) |
 571                         ((tag[1] - 1) << L2X0_LATENCY_CTRL_WR_SHIFT) |
 572                         ((tag[2] - 1) << L2X0_LATENCY_CTRL_SETUP_SHIFT),
 573                         l2x0_base + L2X0_TAG_LATENCY_CTRL);
 574
 575         of_property_read_u32_array(np, "arm,data-latency",
 576                                    data, ARRAY_SIZE(data));
 577         if (data[0] && data[1] && data[2])
 578                 writel_relaxed(
 579                         ((data[0] - 1) << L2X0_LATENCY_CTRL_RD_SHIFT) |
 580                         ((data[1] - 1) << L2X0_LATENCY_CTRL_WR_SHIFT) |
 581                         ((data[2] - 1) << L2X0_LATENCY_CTRL_SETUP_SHIFT),
 582                         l2x0_base + L2X0_DATA_LATENCY_CTRL);
 583
 584         of_property_read_u32_array(np, "arm,filter-ranges",
 585                                    filter, ARRAY_SIZE(filter));
 586         if (filter[1]) {
 587                 writel_relaxed(ALIGN(filter[0] + filter[1], SZ_1M),
 588                                l2x0_base + L2X0_ADDR_FILTER_END);
 589                 writel_relaxed((filter[0] & ~(SZ_1M - 1)) | L2X0_ADDR_FILTER_EN,
 590                                l2x0_base + L2X0_ADDR_FILTER_START);
 591         }
 592 }
 593
 594 static void __init pl310_save(void)
 595 {
 596         u32 l2x0_revision = readl_relaxed(l2x0_base + L2X0_CACHE_ID) &
 597                 L2X0_CACHE_ID_RTL_MASK;
 598
 599         l2x0_saved_regs.tag_latency = readl_relaxed(l2x0_base +
 600                 L2X0_TAG_LATENCY_CTRL);
 601         l2x0_saved_regs.data_latency = readl_relaxed(l2x0_base +
 602                 L2X0_DATA_LATENCY_CTRL);
 603         l2x0_saved_regs.filter_end = readl_relaxed(l2x0_base +
 604                 L2X0_ADDR_FILTER_END);
 605         l2x0_saved_regs.filter_start = readl_relaxed(l2x0_base +
 606                 L2X0_ADDR_FILTER_START);
 607
 608         if (l2x0_revision >= L2X0_CACHE_ID_RTL_R2P0) {
 609                 /*
 610                  * From r2p0, there is Prefetch offset/control register
 611                  */
 612                 l2x0_saved_regs.prefetch_ctrl = readl_relaxed(l2x0_base +
 613                         L2X0_PREFETCH_CTRL);
 614                 /*
 615                  * From r3p0, there is Power control register
 616                  */
 617                 if (l2x0_revision >= L2X0_CACHE_ID_RTL_R3P0)
 618                         l2x0_saved_regs.pwr_ctrl = readl_relaxed(l2x0_base +
 619                                 L2X0_POWER_CTRL);
 620         }
 621 }
 622
 623 static void aurora_save(void)
 624 {
 625         l2x0_saved_regs.ctrl = readl_relaxed(l2x0_base + L2X0_CTRL);
 626         l2x0_saved_regs.aux_ctrl = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 627 }
 628
 629 static void l2x0_resume(void)
 630 {
 631         if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
 632                 /* restore aux ctrl and enable l2 */
 633                 l2x0_unlock(readl_relaxed(l2x0_base + L2X0_CACHE_ID));
 634
 635                 writel_relaxed(l2x0_saved_regs.aux_ctrl, l2x0_base +
 636                         L2X0_AUX_CTRL);
 637
 638                 l2x0_inv_all();
 639
 640                 writel_relaxed(L2X0_CTRL_EN, l2x0_base + L2X0_CTRL);
 641         }
 642 }
 643
 644 static void pl310_resume(void)
 645 {
 646         u32 l2x0_revision;
 647
 648         if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
 649                 /* restore pl310 setup */
 650                 writel_relaxed(l2x0_saved_regs.tag_latency,
 651                         l2x0_base + L2X0_TAG_LATENCY_CTRL);
 652                 writel_relaxed(l2x0_saved_regs.data_latency,
 653                         l2x0_base + L2X0_DATA_LATENCY_CTRL);
 654                 writel_relaxed(l2x0_saved_regs.filter_end,
 655                         l2x0_base + L2X0_ADDR_FILTER_END);
 656                 writel_relaxed(l2x0_saved_regs.filter_start,
 657                         l2x0_base + L2X0_ADDR_FILTER_START);
 658
 659                 l2x0_revision = readl_relaxed(l2x0_base + L2X0_CACHE_ID) &
 660                         L2X0_CACHE_ID_RTL_MASK;
 661
 662                 if (l2x0_revision >= L2X0_CACHE_ID_RTL_R2P0) {
 663                         writel_relaxed(l2x0_saved_regs.prefetch_ctrl,
 664                                 l2x0_base + L2X0_PREFETCH_CTRL);
 665                         if (l2x0_revision >= L2X0_CACHE_ID_RTL_R3P0)
 666                                 writel_relaxed(l2x0_saved_regs.pwr_ctrl,
 667                                         l2x0_base + L2X0_POWER_CTRL);
 668                 }
 669         }
 670
 671         l2x0_resume();
 672 }
 673
 674 static void aurora_resume(void)
 675 {
 676         if (!(readl(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
 677                 writel_relaxed(l2x0_saved_regs.aux_ctrl,
 678                                 l2x0_base + L2X0_AUX_CTRL);
 679                 writel_relaxed(l2x0_saved_regs.ctrl, l2x0_base + L2X0_CTRL);
 680         }
 681 }
 682
 683 static void __init aurora_broadcast_l2_commands(void)
 684 {
 685         __u32 u;
 686         /* Enable Broadcasting of cache commands to L2*/
 687         __asm__ __volatile__("mrc p15, 1, %0, c15, c2, 0" : "=r"(u));
 688         u |= AURORA_CTRL_FW;            /* Set the FW bit */
 689         __asm__ __volatile__("mcr p15, 1, %0, c15, c2, 0\n" : : "r"(u));
 690         isb();
 691 }
 692
 693 static void __init aurora_of_setup(const struct device_node *np,
 694                                 u32 *aux_val, u32 *aux_mask)
 695 {
 696         u32 val = AURORA_ACR_REPLACEMENT_TYPE_SEMIPLRU;
 697         u32 mask =  AURORA_ACR_REPLACEMENT_MASK;
 698
 699         of_property_read_u32(np, "cache-id-part",
 700                         &cache_id_part_number_from_dt);
 701
 702         /* Determine and save the write policy */
 703         l2_wt_override = of_property_read_bool(np, "wt-override");
 704
 705         if (l2_wt_override) {
 706                 val |= AURORA_ACR_FORCE_WRITE_THRO_POLICY;
 707                 mask |= AURORA_ACR_FORCE_WRITE_POLICY_MASK;
 708         }
 709
 710         *aux_val &= ~mask;
 711         *aux_val |= val;
 712         *aux_mask &= ~mask;
 713 }
 714
 715 static const struct l2x0_of_data pl310_data = {
 716         .setup = pl310_of_setup,
 717         .save  = pl310_save,
 718         .outer_cache = {
 719                 .resume      = pl310_resume,
 720                 .inv_range   = l2x0_inv_range,
 721                 .clean_range = l2x0_clean_range,
 722                 .flush_range = l2x0_flush_range,
 723                 .sync        = l2x0_cache_sync,
 724                 .flush_all   = l2x0_flush_all,
 725                 .inv_all     = l2x0_inv_all,
 726                 .disable     = l2x0_disable,
 727         },
 728 };
 729
 730 static const struct l2x0_of_data l2x0_data = {
 731         .setup = l2x0_of_setup,
 732         .save  = NULL,
 733         .outer_cache = {
 734                 .resume      = l2x0_resume,
 735                 .inv_range   = l2x0_inv_range,
 736                 .clean_range = l2x0_clean_range,
 737                 .flush_range = l2x0_flush_range,
 738                 .sync        = l2x0_cache_sync,
 739                 .flush_all   = l2x0_flush_all,
 740                 .inv_all     = l2x0_inv_all,
 741                 .disable     = l2x0_disable,
 742         },
 743 };
 744
 745 static const struct l2x0_of_data aurora_with_outer_data = {
 746         .setup = aurora_of_setup,
 747         .save  = aurora_save,
 748         .outer_cache = {
 749                 .resume      = aurora_resume,
 750                 .inv_range   = aurora_inv_range,
 751                 .clean_range = aurora_clean_range,
 752                 .flush_range = aurora_flush_range,
 753                 .sync        = l2x0_cache_sync,
 754                 .flush_all   = l2x0_flush_all,
 755                 .inv_all     = l2x0_inv_all,
 756                 .disable     = l2x0_disable,
 757         },
 758 };
 759
 760 static const struct l2x0_of_data aurora_no_outer_data = {
 761         .setup = aurora_of_setup,
 762         .save  = aurora_save,
 763         .outer_cache = {
 764                 .resume      = aurora_resume,
 765         },
 766 };
 767
 768 static const struct of_device_id l2x0_ids[] __initconst = {
 769         { .compatible = "arm,pl310-cache", .data = (void *)&pl310_data },
 770         { .compatible = "arm,l220-cache", .data = (void *)&l2x0_data },
 771         { .compatible = "arm,l210-cache", .data = (void *)&l2x0_data },
 772         { .compatible = "marvell,aurora-system-cache",
 773           .data = (void *)&aurora_no_outer_data},
 774         { .compatible = "marvell,aurora-outer-cache",
 775           .data = (void *)&aurora_with_outer_data},
 776         {}
 777 };
 778
 779 int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
 780 {
 781         struct device_node *np;
 782         const struct l2x0_of_data *data;
 783         struct resource res;
 784
 785         np = of_find_matching_node(NULL, l2x0_ids);
 786         if (!np)
 787                 return -ENODEV;
 788
 789         if (of_address_to_resource(np, 0, &res))
 790                 return -ENODEV;
 791
 792         l2x0_base = ioremap(res.start, resource_size(&res));
 793         if (!l2x0_base)
 794                 return -ENOMEM;
 795
 796         l2x0_saved_regs.phy_base = res.start;
 797
 798         data = of_match_node(l2x0_ids, np)->data;
 799
 800         /* L2 configuration can only be changed if the cache is disabled */
 801         if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
 802                 if (data->setup)
 803                         data->setup(np, &aux_val, &aux_mask);
 804
 805                 /* For aurora cache in no outer mode select the
 806                  * correct mode using the coprocessor*/
 807                 if (data == &aurora_no_outer_data)
 808                         aurora_broadcast_l2_commands();
 809         }
 810
 811         if (data->save)
 812                 data->save();
 813
 814         of_init = true;
 815         memcpy(&outer_cache, &data->outer_cache, sizeof(outer_cache));
 816         l2x0_init(l2x0_base, aux_val, aux_mask);
 817
 818         return 0;
 819 }
 820 #endif