arch/arm/mm/cache-l2x0.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/arm/mm/cache-l2x0.c - L210/L220/L310 cache controller support
   4  *
   5  * Copyright (C) 2007 ARM Limited
   6  */
   7 #include <linux/cpu.h>
   8 #include <linux/err.h>
   9 #include <linux/init.h>
  10 #include <linux/smp.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/log2.h>
  13 #include <linux/io.h>
  14 #include <linux/of.h>
  15 #include <linux/of_address.h>
  16
  17 #include <asm/cacheflush.h>
  18 #include <asm/cp15.h>
  19 #include <asm/cputype.h>
  20 #include <asm/hardware/cache-l2x0.h>
  21 #include "cache-tauros3.h"
  22 #include "cache-aurora-l2.h"
  23
  24 struct l2c_init_data {
  25         const char *type;
  26         unsigned way_size_0;
  27         unsigned num_lock;
  28         void (*of_parse)(const struct device_node *, u32 *, u32 *);
  29         void (*enable)(void __iomem *, unsigned);
  30         void (*fixup)(void __iomem *, u32, struct outer_cache_fns *);
  31         void (*save)(void __iomem *);
  32         void (*configure)(void __iomem *);
  33         void (*unlock)(void __iomem *, unsigned);
  34         struct outer_cache_fns outer_cache;
  35 };
  36
  37 #define CACHE_LINE_SIZE         32
  38
  39 static void __iomem *l2x0_base;
  40 static const struct l2c_init_data *l2x0_data;
  41 static DEFINE_RAW_SPINLOCK(l2x0_lock);
  42 static u32 l2x0_way_mask;       /* Bitmask of active ways */
  43 static u32 l2x0_size;
  44 static unsigned long sync_reg_offset = L2X0_CACHE_SYNC;
  45
  46 struct l2x0_regs l2x0_saved_regs;
  47
  48 static bool l2x0_bresp_disable;
  49 static bool l2x0_flz_disable;
  50
  51 /*
  52  * Common code for all cache controllers.
  53  */
  54 static inline void l2c_wait_mask(void __iomem *reg, unsigned long mask)
  55 {
  56         /* wait for cache operation by line or way to complete */
  57         while (readl_relaxed(reg) & mask)
  58                 cpu_relax();
  59 }
  60
  61 /*
  62  * By default, we write directly to secure registers.  Platforms must
  63  * override this if they are running non-secure.
  64  */
  65 static void l2c_write_sec(unsigned long val, void __iomem *base, unsigned reg)
  66 {
  67         if (val == readl_relaxed(base + reg))
  68                 return;
  69         if (outer_cache.write_sec)
  70                 outer_cache.write_sec(val, reg);
  71         else
  72                 writel_relaxed(val, base + reg);
  73 }
  74
  75 /*
  76  * This should only be called when we have a requirement that the
  77  * register be written due to a work-around, as platforms running
  78  * in non-secure mode may not be able to access this register.
  79  */
  80 static inline void l2c_set_debug(void __iomem *base, unsigned long val)
  81 {
  82         l2c_write_sec(val, base, L2X0_DEBUG_CTRL);
  83 }
  84
  85 static void __l2c_op_way(void __iomem *reg)
  86 {
  87         writel_relaxed(l2x0_way_mask, reg);
  88         l2c_wait_mask(reg, l2x0_way_mask);
  89 }
  90
  91 static inline void l2c_unlock(void __iomem *base, unsigned num)
  92 {
  93         unsigned i;
  94
  95         for (i = 0; i < num; i++) {
  96                 writel_relaxed(0, base + L2X0_LOCKDOWN_WAY_D_BASE +
  97                                i * L2X0_LOCKDOWN_STRIDE);
  98                 writel_relaxed(0, base + L2X0_LOCKDOWN_WAY_I_BASE +
  99                                i * L2X0_LOCKDOWN_STRIDE);
 100         }
 101 }
 102
 103 static void l2c_configure(void __iomem *base)
 104 {
 105         l2c_write_sec(l2x0_saved_regs.aux_ctrl, base, L2X0_AUX_CTRL);
 106 }
 107
 108 /*
 109  * Enable the L2 cache controller.  This function must only be
 110  * called when the cache controller is known to be disabled.
 111  */
 112 static void l2c_enable(void __iomem *base, unsigned num_lock)
 113 {
 114         unsigned long flags;
 115
 116         if (outer_cache.configure)
 117                 outer_cache.configure(&l2x0_saved_regs);
 118         else
 119                 l2x0_data->configure(base);
 120
 121         l2x0_data->unlock(base, num_lock);
 122
 123         local_irq_save(flags);
 124         __l2c_op_way(base + L2X0_INV_WAY);
 125         writel_relaxed(0, base + sync_reg_offset);
 126         l2c_wait_mask(base + sync_reg_offset, 1);
 127         local_irq_restore(flags);
 128
 129         l2c_write_sec(L2X0_CTRL_EN, base, L2X0_CTRL);
 130 }
 131
 132 static void l2c_disable(void)
 133 {
 134         void __iomem *base = l2x0_base;
 135
 136         l2x0_pmu_suspend();
 137
 138         outer_cache.flush_all();
 139         l2c_write_sec(0, base, L2X0_CTRL);
 140         dsb(st);
 141 }
 142
 143 static void l2c_save(void __iomem *base)
 144 {
 145         l2x0_saved_regs.aux_ctrl = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 146 }
 147
 148 static void l2c_resume(void)
 149 {
 150         void __iomem *base = l2x0_base;
 151
 152         /* Do not touch the controller if already enabled. */
 153         if (!(readl_relaxed(base + L2X0_CTRL) & L2X0_CTRL_EN))
 154                 l2c_enable(base, l2x0_data->num_lock);
 155
 156         l2x0_pmu_resume();
 157 }
 158
 159 /*
 160  * L2C-210 specific code.
 161  *
 162  * The L2C-2x0 PA, set/way and sync operations are atomic, but we must
 163  * ensure that no background operation is running.  The way operations
 164  * are all background tasks.
 165  *
 166  * While a background operation is in progress, any new operation is
 167  * ignored (unspecified whether this causes an error.)  Thankfully, not
 168  * used on SMP.
 169  *
 170  * Never has a different sync register other than L2X0_CACHE_SYNC, but
 171  * we use sync_reg_offset here so we can share some of this with L2C-310.
 172  */
 173 static void __l2c210_cache_sync(void __iomem *base)
 174 {
 175         writel_relaxed(0, base + sync_reg_offset);
 176 }
 177
 178 static void __l2c210_op_pa_range(void __iomem *reg, unsigned long start,
 179         unsigned long end)
 180 {
 181         while (start < end) {
 182                 writel_relaxed(start, reg);
 183                 start += CACHE_LINE_SIZE;
 184         }
 185 }
 186
 187 static void l2c210_inv_range(unsigned long start, unsigned long end)
 188 {
 189         void __iomem *base = l2x0_base;
 190
 191         if (start & (CACHE_LINE_SIZE - 1)) {
 192                 start &= ~(CACHE_LINE_SIZE - 1);
 193                 writel_relaxed(start, base + L2X0_CLEAN_INV_LINE_PA);
 194                 start += CACHE_LINE_SIZE;
 195         }
 196
 197         if (end & (CACHE_LINE_SIZE - 1)) {
 198                 end &= ~(CACHE_LINE_SIZE - 1);
 199                 writel_relaxed(end, base + L2X0_CLEAN_INV_LINE_PA);
 200         }
 201
 202         __l2c210_op_pa_range(base + L2X0_INV_LINE_PA, start, end);
 203         __l2c210_cache_sync(base);
 204 }
 205
 206 static void l2c210_clean_range(unsigned long start, unsigned long end)
 207 {
 208         void __iomem *base = l2x0_base;
 209
 210         start &= ~(CACHE_LINE_SIZE - 1);
 211         __l2c210_op_pa_range(base + L2X0_CLEAN_LINE_PA, start, end);
 212         __l2c210_cache_sync(base);
 213 }
 214
 215 static void l2c210_flush_range(unsigned long start, unsigned long end)
 216 {
 217         void __iomem *base = l2x0_base;
 218
 219         start &= ~(CACHE_LINE_SIZE - 1);
 220         __l2c210_op_pa_range(base + L2X0_CLEAN_INV_LINE_PA, start, end);
 221         __l2c210_cache_sync(base);
 222 }
 223
 224 static void l2c210_flush_all(void)
 225 {
 226         void __iomem *base = l2x0_base;
 227
 228         BUG_ON(!irqs_disabled());
 229
 230         __l2c_op_way(base + L2X0_CLEAN_INV_WAY);
 231         __l2c210_cache_sync(base);
 232 }
 233
 234 static void l2c210_sync(void)
 235 {
 236         __l2c210_cache_sync(l2x0_base);
 237 }
 238
 239 static const struct l2c_init_data l2c210_data __initconst = {
 240         .type = "L2C-210",
 241         .way_size_0 = SZ_8K,
 242         .num_lock = 1,
 243         .enable = l2c_enable,
 244         .save = l2c_save,
 245         .configure = l2c_configure,
 246         .unlock = l2c_unlock,
 247         .outer_cache = {
 248                 .inv_range = l2c210_inv_range,
 249                 .clean_range = l2c210_clean_range,
 250                 .flush_range = l2c210_flush_range,
 251                 .flush_all = l2c210_flush_all,
 252                 .disable = l2c_disable,
 253                 .sync = l2c210_sync,
 254                 .resume = l2c_resume,
 255         },
 256 };
 257
 258 /*
 259  * L2C-220 specific code.
 260  *
 261  * All operations are background operations: they have to be waited for.
 262  * Conflicting requests generate a slave error (which will cause an
 263  * imprecise abort.)  Never uses sync_reg_offset, so we hard-code the
 264  * sync register here.
 265  *
 266  * However, we can re-use the l2c210_resume call.
 267  */
 268 static inline void __l2c220_cache_sync(void __iomem *base)
 269 {
 270         writel_relaxed(0, base + L2X0_CACHE_SYNC);
 271         l2c_wait_mask(base + L2X0_CACHE_SYNC, 1);
 272 }
 273
 274 static void l2c220_op_way(void __iomem *base, unsigned reg)
 275 {
 276         unsigned long flags;
 277
 278         raw_spin_lock_irqsave(&l2x0_lock, flags);
 279         __l2c_op_way(base + reg);
 280         __l2c220_cache_sync(base);
 281         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 282 }
 283
 284 static unsigned long l2c220_op_pa_range(void __iomem *reg, unsigned long start,
 285         unsigned long end, unsigned long flags)
 286 {
 287         raw_spinlock_t *lock = &l2x0_lock;
 288
 289         while (start < end) {
 290                 unsigned long blk_end = start + min(end - start, 4096UL);
 291
 292                 while (start < blk_end) {
 293                         l2c_wait_mask(reg, 1);
 294                         writel_relaxed(start, reg);
 295                         start += CACHE_LINE_SIZE;
 296                 }
 297
 298                 if (blk_end < end) {
 299                         raw_spin_unlock_irqrestore(lock, flags);
 300                         raw_spin_lock_irqsave(lock, flags);
 301                 }
 302         }
 303
 304         return flags;
 305 }
 306
 307 static void l2c220_inv_range(unsigned long start, unsigned long end)
 308 {
 309         void __iomem *base = l2x0_base;
 310         unsigned long flags;
 311
 312         raw_spin_lock_irqsave(&l2x0_lock, flags);
 313         if ((start | end) & (CACHE_LINE_SIZE - 1)) {
 314                 if (start & (CACHE_LINE_SIZE - 1)) {
 315                         start &= ~(CACHE_LINE_SIZE - 1);
 316                         writel_relaxed(start, base + L2X0_CLEAN_INV_LINE_PA);
 317                         start += CACHE_LINE_SIZE;
 318                 }
 319
 320                 if (end & (CACHE_LINE_SIZE - 1)) {
 321                         end &= ~(CACHE_LINE_SIZE - 1);
 322                         l2c_wait_mask(base + L2X0_CLEAN_INV_LINE_PA, 1);
 323                         writel_relaxed(end, base + L2X0_CLEAN_INV_LINE_PA);
 324                 }
 325         }
 326
 327         flags = l2c220_op_pa_range(base + L2X0_INV_LINE_PA,
 328                                    start, end, flags);
 329         l2c_wait_mask(base + L2X0_INV_LINE_PA, 1);
 330         __l2c220_cache_sync(base);
 331         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 332 }
 333
 334 static void l2c220_clean_range(unsigned long start, unsigned long end)
 335 {
 336         void __iomem *base = l2x0_base;
 337         unsigned long flags;
 338
 339         start &= ~(CACHE_LINE_SIZE - 1);
 340         if ((end - start) >= l2x0_size) {
 341                 l2c220_op_way(base, L2X0_CLEAN_WAY);
 342                 return;
 343         }
 344
 345         raw_spin_lock_irqsave(&l2x0_lock, flags);
 346         flags = l2c220_op_pa_range(base + L2X0_CLEAN_LINE_PA,
 347                                    start, end, flags);
 348         l2c_wait_mask(base + L2X0_CLEAN_INV_LINE_PA, 1);
 349         __l2c220_cache_sync(base);
 350         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 351 }
 352
 353 static void l2c220_flush_range(unsigned long start, unsigned long end)
 354 {
 355         void __iomem *base = l2x0_base;
 356         unsigned long flags;
 357
 358         start &= ~(CACHE_LINE_SIZE - 1);
 359         if ((end - start) >= l2x0_size) {
 360                 l2c220_op_way(base, L2X0_CLEAN_INV_WAY);
 361                 return;
 362         }
 363
 364         raw_spin_lock_irqsave(&l2x0_lock, flags);
 365         flags = l2c220_op_pa_range(base + L2X0_CLEAN_INV_LINE_PA,
 366                                    start, end, flags);
 367         l2c_wait_mask(base + L2X0_CLEAN_INV_LINE_PA, 1);
 368         __l2c220_cache_sync(base);
 369         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 370 }
 371
 372 static void l2c220_flush_all(void)
 373 {
 374         l2c220_op_way(l2x0_base, L2X0_CLEAN_INV_WAY);
 375 }
 376
 377 static void l2c220_sync(void)
 378 {
 379         unsigned long flags;
 380
 381         raw_spin_lock_irqsave(&l2x0_lock, flags);
 382         __l2c220_cache_sync(l2x0_base);
 383         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
 384 }
 385
 386 static void l2c220_enable(void __iomem *base, unsigned num_lock)
 387 {
 388         /*
 389          * Always enable non-secure access to the lockdown registers -
 390          * we write to them as part of the L2C enable sequence so they
 391          * need to be accessible.
 392          */
 393         l2x0_saved_regs.aux_ctrl |= L220_AUX_CTRL_NS_LOCKDOWN;
 394
 395         l2c_enable(base, num_lock);
 396 }
 397
 398 static void l2c220_unlock(void __iomem *base, unsigned num_lock)
 399 {
 400         if (readl_relaxed(base + L2X0_AUX_CTRL) & L220_AUX_CTRL_NS_LOCKDOWN)
 401                 l2c_unlock(base, num_lock);
 402 }
 403
 404 static const struct l2c_init_data l2c220_data = {
 405         .type = "L2C-220",
 406         .way_size_0 = SZ_8K,
 407         .num_lock = 1,
 408         .enable = l2c220_enable,
 409         .save = l2c_save,
 410         .configure = l2c_configure,
 411         .unlock = l2c220_unlock,
 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         l2c_configure(base);
 573
 574         /* restore pl310 setup */
 575         l2c_write_sec(l2x0_saved_regs.tag_latency, base,
 576                       L310_TAG_LATENCY_CTRL);
 577         l2c_write_sec(l2x0_saved_regs.data_latency, base,
 578                       L310_DATA_LATENCY_CTRL);
 579         l2c_write_sec(l2x0_saved_regs.filter_end, base,
 580                       L310_ADDR_FILTER_END);
 581         l2c_write_sec(l2x0_saved_regs.filter_start, base,
 582                       L310_ADDR_FILTER_START);
 583
 584         revision = readl_relaxed(base + L2X0_CACHE_ID) &
 585                                  L2X0_CACHE_ID_RTL_MASK;
 586
 587         if (revision >= L310_CACHE_ID_RTL_R2P0)
 588                 l2c_write_sec(l2x0_saved_regs.prefetch_ctrl, base,
 589                               L310_PREFETCH_CTRL);
 590         if (revision >= L310_CACHE_ID_RTL_R3P0)
 591                 l2c_write_sec(l2x0_saved_regs.pwr_ctrl, base,
 592                               L310_POWER_CTRL);
 593 }
 594
 595 static int l2c310_starting_cpu(unsigned int cpu)
 596 {
 597         set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1));
 598         return 0;
 599 }
 600
 601 static int l2c310_dying_cpu(unsigned int cpu)
 602 {
 603         set_auxcr(get_auxcr() & ~(BIT(3) | BIT(2) | BIT(1)));
 604         return 0;
 605 }
 606
 607 static void __init l2c310_enable(void __iomem *base, unsigned num_lock)
 608 {
 609         unsigned rev = readl_relaxed(base + L2X0_CACHE_ID) & L2X0_CACHE_ID_RTL_MASK;
 610         bool cortex_a9 = read_cpuid_part() == ARM_CPU_PART_CORTEX_A9;
 611         u32 aux = l2x0_saved_regs.aux_ctrl;
 612
 613         if (rev >= L310_CACHE_ID_RTL_R2P0) {
 614                 if (cortex_a9 && !l2x0_bresp_disable) {
 615                         aux |= L310_AUX_CTRL_EARLY_BRESP;
 616                         pr_info("L2C-310 enabling early BRESP for Cortex-A9\n");
 617                 } else if (aux & L310_AUX_CTRL_EARLY_BRESP) {
 618                         pr_warn("L2C-310 early BRESP only supported with Cortex-A9\n");
 619                         aux &= ~L310_AUX_CTRL_EARLY_BRESP;
 620                 }
 621         }
 622
 623         if (cortex_a9 && !l2x0_flz_disable) {
 624                 u32 aux_cur = readl_relaxed(base + L2X0_AUX_CTRL);
 625                 u32 acr = get_auxcr();
 626
 627                 pr_debug("Cortex-A9 ACR=0x%08x\n", acr);
 628
 629                 if (acr & BIT(3) && !(aux_cur & L310_AUX_CTRL_FULL_LINE_ZERO))
 630                         pr_err("L2C-310: full line of zeros enabled in Cortex-A9 but not L2C-310 - invalid\n");
 631
 632                 if (aux & L310_AUX_CTRL_FULL_LINE_ZERO && !(acr & BIT(3)))
 633                         pr_err("L2C-310: enabling full line of zeros but not enabled in Cortex-A9\n");
 634
 635                 if (!(aux & L310_AUX_CTRL_FULL_LINE_ZERO) && !outer_cache.write_sec) {
 636                         aux |= L310_AUX_CTRL_FULL_LINE_ZERO;
 637                         pr_info("L2C-310 full line of zeros enabled for Cortex-A9\n");
 638                 }
 639         } else if (aux & (L310_AUX_CTRL_FULL_LINE_ZERO | L310_AUX_CTRL_EARLY_BRESP)) {
 640                 pr_err("L2C-310: disabling Cortex-A9 specific feature bits\n");
 641                 aux &= ~(L310_AUX_CTRL_FULL_LINE_ZERO | L310_AUX_CTRL_EARLY_BRESP);
 642         }
 643
 644         /*
 645          * Always enable non-secure access to the lockdown registers -
 646          * we write to them as part of the L2C enable sequence so they
 647          * need to be accessible.
 648          */
 649         l2x0_saved_regs.aux_ctrl = aux | L310_AUX_CTRL_NS_LOCKDOWN;
 650
 651         l2c_enable(base, num_lock);
 652
 653         /* Read back resulting AUX_CTRL value as it could have been altered. */
 654         aux = readl_relaxed(base + L2X0_AUX_CTRL);
 655
 656         if (aux & (L310_AUX_CTRL_DATA_PREFETCH | L310_AUX_CTRL_INSTR_PREFETCH)) {
 657                 u32 prefetch = readl_relaxed(base + L310_PREFETCH_CTRL);
 658
 659                 pr_info("L2C-310 %s%s prefetch enabled, offset %u lines\n",
 660                         aux & L310_AUX_CTRL_INSTR_PREFETCH ? "I" : "",
 661                         aux & L310_AUX_CTRL_DATA_PREFETCH ? "D" : "",
 662                         1 + (prefetch & L310_PREFETCH_CTRL_OFFSET_MASK));
 663         }
 664
 665         /* r3p0 or later has power control register */
 666         if (rev >= L310_CACHE_ID_RTL_R3P0) {
 667                 u32 power_ctrl;
 668
 669                 power_ctrl = readl_relaxed(base + L310_POWER_CTRL);
 670                 pr_info("L2C-310 dynamic clock gating %sabled, standby mode %sabled\n",
 671                         power_ctrl & L310_DYNAMIC_CLK_GATING_EN ? "en" : "dis",
 672                         power_ctrl & L310_STNDBY_MODE_EN ? "en" : "dis");
 673         }
 674
 675         if (aux & L310_AUX_CTRL_FULL_LINE_ZERO)
 676                 cpuhp_setup_state(CPUHP_AP_ARM_L2X0_STARTING,
 677                                   "arm/l2x0:starting", l2c310_starting_cpu,
 678                                   l2c310_dying_cpu);
 679 }
 680
 681 static void __init l2c310_fixup(void __iomem *base, u32 cache_id,
 682         struct outer_cache_fns *fns)
 683 {
 684         unsigned revision = cache_id & L2X0_CACHE_ID_RTL_MASK;
 685         const char *errata[8];
 686         unsigned n = 0;
 687
 688         if (IS_ENABLED(CONFIG_PL310_ERRATA_588369) &&
 689             revision < L310_CACHE_ID_RTL_R2P0 &&
 690             /* For bcm compatibility */
 691             fns->inv_range == l2c210_inv_range) {
 692                 fns->inv_range = l2c310_inv_range_erratum;
 693                 fns->flush_range = l2c310_flush_range_erratum;
 694                 errata[n++] = "588369";
 695         }
 696
 697         if (IS_ENABLED(CONFIG_PL310_ERRATA_727915) &&
 698             revision >= L310_CACHE_ID_RTL_R2P0 &&
 699             revision < L310_CACHE_ID_RTL_R3P1) {
 700                 fns->flush_all = l2c310_flush_all_erratum;
 701                 errata[n++] = "727915";
 702         }
 703
 704         if (revision >= L310_CACHE_ID_RTL_R3P0 &&
 705             revision < L310_CACHE_ID_RTL_R3P2) {
 706                 u32 val = l2x0_saved_regs.prefetch_ctrl;
 707                 if (val & L310_PREFETCH_CTRL_DBL_LINEFILL) {
 708                         val &= ~L310_PREFETCH_CTRL_DBL_LINEFILL;
 709                         l2x0_saved_regs.prefetch_ctrl = val;
 710                         errata[n++] = "752271";
 711                 }
 712         }
 713
 714         if (IS_ENABLED(CONFIG_PL310_ERRATA_753970) &&
 715             revision == L310_CACHE_ID_RTL_R3P0) {
 716                 sync_reg_offset = L2X0_DUMMY_REG;
 717                 errata[n++] = "753970";
 718         }
 719
 720         if (IS_ENABLED(CONFIG_PL310_ERRATA_769419))
 721                 errata[n++] = "769419";
 722
 723         if (n) {
 724                 unsigned i;
 725
 726                 pr_info("L2C-310 errat%s", n > 1 ? "a" : "um");
 727                 for (i = 0; i < n; i++)
 728                         pr_cont(" %s", errata[i]);
 729                 pr_cont(" enabled\n");
 730         }
 731 }
 732
 733 static void l2c310_disable(void)
 734 {
 735         /*
 736          * If full-line-of-zeros is enabled, we must first disable it in the
 737          * Cortex-A9 auxiliary control register before disabling the L2 cache.
 738          */
 739         if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_FULL_LINE_ZERO)
 740                 set_auxcr(get_auxcr() & ~(BIT(3) | BIT(2) | BIT(1)));
 741
 742         l2c_disable();
 743 }
 744
 745 static void l2c310_resume(void)
 746 {
 747         l2c_resume();
 748
 749         /* Re-enable full-line-of-zeros for Cortex-A9 */
 750         if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_FULL_LINE_ZERO)
 751                 set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1));
 752 }
 753
 754 static void l2c310_unlock(void __iomem *base, unsigned num_lock)
 755 {
 756         if (readl_relaxed(base + L2X0_AUX_CTRL) & L310_AUX_CTRL_NS_LOCKDOWN)
 757                 l2c_unlock(base, num_lock);
 758 }
 759
 760 static const struct l2c_init_data l2c310_init_fns __initconst = {
 761         .type = "L2C-310",
 762         .way_size_0 = SZ_8K,
 763         .num_lock = 8,
 764         .enable = l2c310_enable,
 765         .fixup = l2c310_fixup,
 766         .save = l2c310_save,
 767         .configure = l2c310_configure,
 768         .unlock = l2c310_unlock,
 769         .outer_cache = {
 770                 .inv_range = l2c210_inv_range,
 771                 .clean_range = l2c210_clean_range,
 772                 .flush_range = l2c210_flush_range,
 773                 .flush_all = l2c210_flush_all,
 774                 .disable = l2c310_disable,
 775                 .sync = l2c210_sync,
 776                 .resume = l2c310_resume,
 777         },
 778 };
 779
 780 static int __init __l2c_init(const struct l2c_init_data *data,
 781                              u32 aux_val, u32 aux_mask, u32 cache_id, bool nosync)
 782 {
 783         struct outer_cache_fns fns;
 784         unsigned way_size_bits, ways;
 785         u32 aux, old_aux;
 786
 787         /*
 788          * Save the pointer globally so that callbacks which do not receive
 789          * context from callers can access the structure.
 790          */
 791         l2x0_data = kmemdup(data, sizeof(*data), GFP_KERNEL);
 792         if (!l2x0_data)
 793                 return -ENOMEM;
 794
 795         /*
 796          * Sanity check the aux values.  aux_mask is the bits we preserve
 797          * from reading the hardware register, and aux_val is the bits we
 798          * set.
 799          */
 800         if (aux_val & aux_mask)
 801                 pr_alert("L2C: platform provided aux values permit register corruption.\n");
 802
 803         old_aux = aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 804         aux &= aux_mask;
 805         aux |= aux_val;
 806
 807         if (old_aux != aux)
 808                 pr_warn("L2C: DT/platform modifies aux control register: 0x%08x -> 0x%08x\n",
 809                         old_aux, aux);
 810
 811         /* Determine the number of ways */
 812         switch (cache_id & L2X0_CACHE_ID_PART_MASK) {
 813         case L2X0_CACHE_ID_PART_L310:
 814                 if ((aux_val | ~aux_mask) & (L2C_AUX_CTRL_WAY_SIZE_MASK | L310_AUX_CTRL_ASSOCIATIVITY_16))
 815                         pr_warn("L2C: DT/platform tries to modify or specify cache size\n");
 816                 if (aux & (1 << 16))
 817                         ways = 16;
 818                 else
 819                         ways = 8;
 820                 break;
 821
 822         case L2X0_CACHE_ID_PART_L210:
 823         case L2X0_CACHE_ID_PART_L220:
 824                 ways = (aux >> 13) & 0xf;
 825                 break;
 826
 827         case AURORA_CACHE_ID:
 828                 ways = (aux >> 13) & 0xf;
 829                 ways = 2 << ((ways + 1) >> 2);
 830                 break;
 831
 832         default:
 833                 /* Assume unknown chips have 8 ways */
 834                 ways = 8;
 835                 break;
 836         }
 837
 838         l2x0_way_mask = (1 << ways) - 1;
 839
 840         /*
 841          * way_size_0 is the size that a way_size value of zero would be
 842          * given the calculation: way_size = way_size_0 << way_size_bits.
 843          * So, if way_size_bits=0 is reserved, but way_size_bits=1 is 16k,
 844          * then way_size_0 would be 8k.
 845          *
 846          * L2 cache size = number of ways * way size.
 847          */
 848         way_size_bits = (aux & L2C_AUX_CTRL_WAY_SIZE_MASK) >>
 849                         L2C_AUX_CTRL_WAY_SIZE_SHIFT;
 850         l2x0_size = ways * (data->way_size_0 << way_size_bits);
 851
 852         fns = data->outer_cache;
 853         fns.write_sec = outer_cache.write_sec;
 854         fns.configure = outer_cache.configure;
 855         if (data->fixup)
 856                 data->fixup(l2x0_base, cache_id, &fns);
 857         if (nosync) {
 858                 pr_info("L2C: disabling outer sync\n");
 859                 fns.sync = NULL;
 860         }
 861
 862         /*
 863          * Check if l2x0 controller is already enabled.  If we are booting
 864          * in non-secure mode accessing the below registers will fault.
 865          */
 866         if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
 867                 l2x0_saved_regs.aux_ctrl = aux;
 868
 869                 data->enable(l2x0_base, data->num_lock);
 870         }
 871
 872         outer_cache = fns;
 873
 874         /*
 875          * It is strange to save the register state before initialisation,
 876          * but hey, this is what the DT implementations decided to do.
 877          */
 878         if (data->save)
 879                 data->save(l2x0_base);
 880
 881         /* Re-read it in case some bits are reserved. */
 882         aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 883
 884         pr_info("%s cache controller enabled, %d ways, %d kB\n",
 885                 data->type, ways, l2x0_size >> 10);
 886         pr_info("%s: CACHE_ID 0x%08x, AUX_CTRL 0x%08x\n",
 887                 data->type, cache_id, aux);
 888
 889         l2x0_pmu_register(l2x0_base, cache_id);
 890
 891         return 0;
 892 }
 893
 894 void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
 895 {
 896         const struct l2c_init_data *data;
 897         u32 cache_id;
 898
 899         l2x0_base = base;
 900
 901         cache_id = readl_relaxed(base + L2X0_CACHE_ID);
 902
 903         switch (cache_id & L2X0_CACHE_ID_PART_MASK) {
 904         default:
 905         case L2X0_CACHE_ID_PART_L210:
 906                 data = &l2c210_data;
 907                 break;
 908
 909         case L2X0_CACHE_ID_PART_L220:
 910                 data = &l2c220_data;
 911                 break;
 912
 913         case L2X0_CACHE_ID_PART_L310:
 914                 data = &l2c310_init_fns;
 915                 break;
 916         }
 917
 918         /* Read back current (default) hardware configuration */
 919         if (data->save)
 920                 data->save(l2x0_base);
 921
 922         __l2c_init(data, aux_val, aux_mask, cache_id, false);
 923 }
 924
 925 #ifdef CONFIG_OF
 926 static int l2_wt_override;
 927
 928 /* Aurora don't have the cache ID register available, so we have to
 929  * pass it though the device tree */
 930 static u32 cache_id_part_number_from_dt;
 931
 932 /**
 933  * l2x0_cache_size_of_parse() - read cache size parameters from DT
 934  * @np: the device tree node for the l2 cache
 935  * @aux_val: pointer to machine-supplied auxilary register value, to
 936  * be augmented by the call (bits to be set to 1)
 937  * @aux_mask: pointer to machine-supplied auxilary register mask, to
 938  * be augmented by the call (bits to be set to 0)
 939  * @associativity: variable to return the calculated associativity in
 940  * @max_way_size: the maximum size in bytes for the cache ways
 941  */
 942 static int __init l2x0_cache_size_of_parse(const struct device_node *np,
 943                                             u32 *aux_val, u32 *aux_mask,
 944                                             u32 *associativity,
 945                                             u32 max_way_size)
 946 {
 947         u32 mask = 0, val = 0;
 948         u32 cache_size = 0, sets = 0;
 949         u32 way_size_bits = 1;
 950         u32 way_size = 0;
 951         u32 block_size = 0;
 952         u32 line_size = 0;
 953
 954         of_property_read_u32(np, "cache-size", &cache_size);
 955         of_property_read_u32(np, "cache-sets", &sets);
 956         of_property_read_u32(np, "cache-block-size", &block_size);
 957         of_property_read_u32(np, "cache-line-size", &line_size);
 958
 959         if (!cache_size || !sets)
 960                 return -ENODEV;
 961
 962         /* All these l2 caches have the same line = block size actually */
 963         if (!line_size) {
 964                 if (block_size) {
 965                         /* If linesize is not given, it is equal to blocksize */
 966                         line_size = block_size;
 967                 } else {
 968                         /* Fall back to known size */
 969                         pr_warn("L2C OF: no cache block/line size given: "
 970                                 "falling back to default size %d bytes\n",
 971                                 CACHE_LINE_SIZE);
 972                         line_size = CACHE_LINE_SIZE;
 973                 }
 974         }
 975
 976         if (line_size != CACHE_LINE_SIZE)
 977                 pr_warn("L2C OF: DT supplied line size %d bytes does "
 978                         "not match hardware line size of %d bytes\n",
 979                         line_size,
 980                         CACHE_LINE_SIZE);
 981
 982         /*
 983          * Since:
 984          * set size = cache size / sets
 985          * ways = cache size / (sets * line size)
 986          * way size = cache size / (cache size / (sets * line size))
 987          * way size = sets * line size
 988          * associativity = ways = cache size / way size
 989          */
 990         way_size = sets * line_size;
 991         *associativity = cache_size / way_size;
 992
 993         if (way_size > max_way_size) {
 994                 pr_err("L2C OF: set size %dKB is too large\n", way_size);
 995                 return -EINVAL;
 996         }
 997
 998         pr_info("L2C OF: override cache size: %d bytes (%dKB)\n",
 999                 cache_size, cache_size >> 10);
1000         pr_info("L2C OF: override line size: %d bytes\n", line_size);
1001         pr_info("L2C OF: override way size: %d bytes (%dKB)\n",
1002                 way_size, way_size >> 10);
1003         pr_info("L2C OF: override associativity: %d\n", *associativity);
1004
1005         /*
1006          * Calculates the bits 17:19 to set for way size:
1007          * 512KB -> 6, 256KB -> 5, ... 16KB -> 1
1008          */
1009         way_size_bits = ilog2(way_size >> 10) - 3;
1010         if (way_size_bits < 1 || way_size_bits > 6) {
1011                 pr_err("L2C OF: cache way size illegal: %dKB is not mapped\n",
1012                        way_size);
1013                 return -EINVAL;
1014         }
1015
1016         mask |= L2C_AUX_CTRL_WAY_SIZE_MASK;
1017         val |= (way_size_bits << L2C_AUX_CTRL_WAY_SIZE_SHIFT);
1018
1019         *aux_val &= ~mask;
1020         *aux_val |= val;
1021         *aux_mask &= ~mask;
1022
1023         return 0;
1024 }
1025
1026 static void __init l2x0_of_parse(const struct device_node *np,
1027                                  u32 *aux_val, u32 *aux_mask)
1028 {
1029         u32 data[2] = { 0, 0 };
1030         u32 tag = 0;
1031         u32 dirty = 0;
1032         u32 val = 0, mask = 0;
1033         u32 assoc;
1034         int ret;
1035
1036         of_property_read_u32(np, "arm,tag-latency", &tag);
1037         if (tag) {
1038                 mask |= L2X0_AUX_CTRL_TAG_LATENCY_MASK;
1039                 val |= (tag - 1) << L2X0_AUX_CTRL_TAG_LATENCY_SHIFT;
1040         }
1041
1042         of_property_read_u32_array(np, "arm,data-latency",
1043                                    data, ARRAY_SIZE(data));
1044         if (data[0] && data[1]) {
1045                 mask |= L2X0_AUX_CTRL_DATA_RD_LATENCY_MASK |
1046                         L2X0_AUX_CTRL_DATA_WR_LATENCY_MASK;
1047                 val |= ((data[0] - 1) << L2X0_AUX_CTRL_DATA_RD_LATENCY_SHIFT) |
1048                        ((data[1] - 1) << L2X0_AUX_CTRL_DATA_WR_LATENCY_SHIFT);
1049         }
1050
1051         of_property_read_u32(np, "arm,dirty-latency", &dirty);
1052         if (dirty) {
1053                 mask |= L2X0_AUX_CTRL_DIRTY_LATENCY_MASK;
1054                 val |= (dirty - 1) << L2X0_AUX_CTRL_DIRTY_LATENCY_SHIFT;
1055         }
1056
1057         if (of_property_read_bool(np, "arm,parity-enable")) {
1058                 mask &= ~L2C_AUX_CTRL_PARITY_ENABLE;
1059                 val |= L2C_AUX_CTRL_PARITY_ENABLE;
1060         } else if (of_property_read_bool(np, "arm,parity-disable")) {
1061                 mask &= ~L2C_AUX_CTRL_PARITY_ENABLE;
1062         }
1063
1064         if (of_property_read_bool(np, "arm,shared-override")) {
1065                 mask &= ~L2C_AUX_CTRL_SHARED_OVERRIDE;
1066                 val |= L2C_AUX_CTRL_SHARED_OVERRIDE;
1067         }
1068
1069         ret = l2x0_cache_size_of_parse(np, aux_val, aux_mask, &assoc, SZ_256K);
1070         if (ret)
1071                 return;
1072
1073         if (assoc > 8) {
1074                 pr_err("l2x0 of: cache setting yield too high associativity\n");
1075                 pr_err("l2x0 of: %d calculated, max 8\n", assoc);
1076         } else {
1077                 mask |= L2X0_AUX_CTRL_ASSOC_MASK;
1078                 val |= (assoc << L2X0_AUX_CTRL_ASSOC_SHIFT);
1079         }
1080
1081         *aux_val &= ~mask;
1082         *aux_val |= val;
1083         *aux_mask &= ~mask;
1084 }
1085
1086 static const struct l2c_init_data of_l2c210_data __initconst = {
1087         .type = "L2C-210",
1088         .way_size_0 = SZ_8K,
1089         .num_lock = 1,
1090         .of_parse = l2x0_of_parse,
1091         .enable = l2c_enable,
1092         .save = l2c_save,
1093         .configure = l2c_configure,
1094         .unlock = l2c_unlock,
1095         .outer_cache = {
1096                 .inv_range   = l2c210_inv_range,
1097                 .clean_range = l2c210_clean_range,
1098                 .flush_range = l2c210_flush_range,
1099                 .flush_all   = l2c210_flush_all,
1100                 .disable     = l2c_disable,
1101                 .sync        = l2c210_sync,
1102                 .resume      = l2c_resume,
1103         },
1104 };
1105
1106 static const struct l2c_init_data of_l2c220_data __initconst = {
1107         .type = "L2C-220",
1108         .way_size_0 = SZ_8K,
1109         .num_lock = 1,
1110         .of_parse = l2x0_of_parse,
1111         .enable = l2c220_enable,
1112         .save = l2c_save,
1113         .configure = l2c_configure,
1114         .unlock = l2c220_unlock,
1115         .outer_cache = {
1116                 .inv_range   = l2c220_inv_range,
1117                 .clean_range = l2c220_clean_range,
1118                 .flush_range = l2c220_flush_range,
1119                 .flush_all   = l2c220_flush_all,
1120                 .disable     = l2c_disable,
1121                 .sync        = l2c220_sync,
1122                 .resume      = l2c_resume,
1123         },
1124 };
1125
1126 static void __init l2c310_of_parse(const struct device_node *np,
1127         u32 *aux_val, u32 *aux_mask)
1128 {
1129         u32 data[3] = { 0, 0, 0 };
1130         u32 tag[3] = { 0, 0, 0 };
1131         u32 filter[2] = { 0, 0 };
1132         u32 assoc;
1133         u32 prefetch;
1134         u32 power;
1135         u32 val;
1136         int ret;
1137
1138         of_property_read_u32_array(np, "arm,tag-latency", tag, ARRAY_SIZE(tag));
1139         if (tag[0] && tag[1] && tag[2])
1140                 l2x0_saved_regs.tag_latency =
1141                         L310_LATENCY_CTRL_RD(tag[0] - 1) |
1142                         L310_LATENCY_CTRL_WR(tag[1] - 1) |
1143                         L310_LATENCY_CTRL_SETUP(tag[2] - 1);
1144
1145         of_property_read_u32_array(np, "arm,data-latency",
1146                                    data, ARRAY_SIZE(data));
1147         if (data[0] && data[1] && data[2])
1148                 l2x0_saved_regs.data_latency =
1149                         L310_LATENCY_CTRL_RD(data[0] - 1) |
1150                         L310_LATENCY_CTRL_WR(data[1] - 1) |
1151                         L310_LATENCY_CTRL_SETUP(data[2] - 1);
1152
1153         of_property_read_u32_array(np, "arm,filter-ranges",
1154                                    filter, ARRAY_SIZE(filter));
1155         if (filter[1]) {
1156                 l2x0_saved_regs.filter_end =
1157                                         ALIGN(filter[0] + filter[1], SZ_1M);
1158                 l2x0_saved_regs.filter_start = (filter[0] & ~(SZ_1M - 1))
1159                                         | L310_ADDR_FILTER_EN;
1160         }
1161
1162         ret = l2x0_cache_size_of_parse(np, aux_val, aux_mask, &assoc, SZ_512K);
1163         if (!ret) {
1164                 switch (assoc) {
1165                 case 16:
1166                         *aux_val &= ~L2X0_AUX_CTRL_ASSOC_MASK;
1167                         *aux_val |= L310_AUX_CTRL_ASSOCIATIVITY_16;
1168                         *aux_mask &= ~L2X0_AUX_CTRL_ASSOC_MASK;
1169                         break;
1170                 case 8:
1171                         *aux_val &= ~L2X0_AUX_CTRL_ASSOC_MASK;
1172                         *aux_mask &= ~L2X0_AUX_CTRL_ASSOC_MASK;
1173                         break;
1174                 default:
1175                         pr_err("L2C-310 OF cache associativity %d invalid, only 8 or 16 permitted\n",
1176                                assoc);
1177                         break;
1178                 }
1179         }
1180
1181         if (of_property_read_bool(np, "arm,shared-override")) {
1182                 *aux_val |= L2C_AUX_CTRL_SHARED_OVERRIDE;
1183                 *aux_mask &= ~L2C_AUX_CTRL_SHARED_OVERRIDE;
1184         }
1185
1186         if (of_property_read_bool(np, "arm,parity-enable")) {
1187                 *aux_val |= L2C_AUX_CTRL_PARITY_ENABLE;
1188                 *aux_mask &= ~L2C_AUX_CTRL_PARITY_ENABLE;
1189         } else if (of_property_read_bool(np, "arm,parity-disable")) {
1190                 *aux_val &= ~L2C_AUX_CTRL_PARITY_ENABLE;
1191                 *aux_mask &= ~L2C_AUX_CTRL_PARITY_ENABLE;
1192         }
1193
1194         if (of_property_read_bool(np, "arm,early-bresp-disable"))
1195                 l2x0_bresp_disable = true;
1196
1197         if (of_property_read_bool(np, "arm,full-line-zero-disable"))
1198                 l2x0_flz_disable = true;
1199
1200         prefetch = l2x0_saved_regs.prefetch_ctrl;
1201
1202         ret = of_property_read_u32(np, "arm,double-linefill", &val);
1203         if (ret == 0) {
1204                 if (val)
1205                         prefetch |= L310_PREFETCH_CTRL_DBL_LINEFILL;
1206                 else
1207                         prefetch &= ~L310_PREFETCH_CTRL_DBL_LINEFILL;
1208         } else if (ret != -EINVAL) {
1209                 pr_err("L2C-310 OF arm,double-linefill property value is missing\n");
1210         }
1211
1212         ret = of_property_read_u32(np, "arm,double-linefill-incr", &val);
1213         if (ret == 0) {
1214                 if (val)
1215                         prefetch |= L310_PREFETCH_CTRL_DBL_LINEFILL_INCR;
1216                 else
1217                         prefetch &= ~L310_PREFETCH_CTRL_DBL_LINEFILL_INCR;
1218         } else if (ret != -EINVAL) {
1219                 pr_err("L2C-310 OF arm,double-linefill-incr property value is missing\n");
1220         }
1221
1222         ret = of_property_read_u32(np, "arm,double-linefill-wrap", &val);
1223         if (ret == 0) {
1224                 if (!val)
1225                         prefetch |= L310_PREFETCH_CTRL_DBL_LINEFILL_WRAP;
1226                 else
1227                         prefetch &= ~L310_PREFETCH_CTRL_DBL_LINEFILL_WRAP;
1228         } else if (ret != -EINVAL) {
1229                 pr_err("L2C-310 OF arm,double-linefill-wrap property value is missing\n");
1230         }
1231
1232         ret = of_property_read_u32(np, "arm,prefetch-drop", &val);
1233         if (ret == 0) {
1234                 if (val)
1235                         prefetch |= L310_PREFETCH_CTRL_PREFETCH_DROP;
1236                 else
1237                         prefetch &= ~L310_PREFETCH_CTRL_PREFETCH_DROP;
1238         } else if (ret != -EINVAL) {
1239                 pr_err("L2C-310 OF arm,prefetch-drop property value is missing\n");
1240         }
1241
1242         ret = of_property_read_u32(np, "arm,prefetch-offset", &val);
1243         if (ret == 0) {
1244                 prefetch &= ~L310_PREFETCH_CTRL_OFFSET_MASK;
1245                 prefetch |= val & L310_PREFETCH_CTRL_OFFSET_MASK;
1246         } else if (ret != -EINVAL) {
1247                 pr_err("L2C-310 OF arm,prefetch-offset property value is missing\n");
1248         }
1249
1250         ret = of_property_read_u32(np, "prefetch-data", &val);
1251         if (ret == 0) {
1252                 if (val)
1253                         prefetch |= L310_PREFETCH_CTRL_DATA_PREFETCH;
1254                 else
1255                         prefetch &= ~L310_PREFETCH_CTRL_DATA_PREFETCH;
1256         } else if (ret != -EINVAL) {
1257                 pr_err("L2C-310 OF prefetch-data property value is missing\n");
1258         }
1259
1260         ret = of_property_read_u32(np, "prefetch-instr", &val);
1261         if (ret == 0) {
1262                 if (val)
1263                         prefetch |= L310_PREFETCH_CTRL_INSTR_PREFETCH;
1264                 else
1265                         prefetch &= ~L310_PREFETCH_CTRL_INSTR_PREFETCH;
1266         } else if (ret != -EINVAL) {
1267                 pr_err("L2C-310 OF prefetch-instr property value is missing\n");
1268         }
1269
1270         l2x0_saved_regs.prefetch_ctrl = prefetch;
1271
1272         power = l2x0_saved_regs.pwr_ctrl |
1273                 L310_DYNAMIC_CLK_GATING_EN | L310_STNDBY_MODE_EN;
1274
1275         ret = of_property_read_u32(np, "arm,dynamic-clock-gating", &val);
1276         if (!ret) {
1277                 if (!val)
1278                         power &= ~L310_DYNAMIC_CLK_GATING_EN;
1279         } else if (ret != -EINVAL) {
1280                 pr_err("L2C-310 OF dynamic-clock-gating property value is missing or invalid\n");
1281         }
1282         ret = of_property_read_u32(np, "arm,standby-mode", &val);
1283         if (!ret) {
1284                 if (!val)
1285                         power &= ~L310_STNDBY_MODE_EN;
1286         } else if (ret != -EINVAL) {
1287                 pr_err("L2C-310 OF standby-mode property value is missing or invalid\n");
1288         }
1289
1290         l2x0_saved_regs.pwr_ctrl = power;
1291 }
1292
1293 static const struct l2c_init_data of_l2c310_data __initconst = {
1294         .type = "L2C-310",
1295         .way_size_0 = SZ_8K,
1296         .num_lock = 8,
1297         .of_parse = l2c310_of_parse,
1298         .enable = l2c310_enable,
1299         .fixup = l2c310_fixup,
1300         .save  = l2c310_save,
1301         .configure = l2c310_configure,
1302         .unlock = l2c310_unlock,
1303         .outer_cache = {
1304                 .inv_range   = l2c210_inv_range,
1305                 .clean_range = l2c210_clean_range,
1306                 .flush_range = l2c210_flush_range,
1307                 .flush_all   = l2c210_flush_all,
1308                 .disable     = l2c310_disable,
1309                 .sync        = l2c210_sync,
1310                 .resume      = l2c310_resume,
1311         },
1312 };
1313
1314 /*
1315  * This is a variant of the of_l2c310_data with .sync set to
1316  * NULL. Outer sync operations are not needed when the system is I/O
1317  * coherent, and potentially harmful in certain situations (PCIe/PL310
1318  * deadlock on Armada 375/38x due to hardware I/O coherency). The
1319  * other operations are kept because they are infrequent (therefore do
1320  * not cause the deadlock in practice) and needed for secondary CPU
1321  * boot and other power management activities.
1322  */
1323 static const struct l2c_init_data of_l2c310_coherent_data __initconst = {
1324         .type = "L2C-310 Coherent",
1325         .way_size_0 = SZ_8K,
1326         .num_lock = 8,
1327         .of_parse = l2c310_of_parse,
1328         .enable = l2c310_enable,
1329         .fixup = l2c310_fixup,
1330         .save  = l2c310_save,
1331         .configure = l2c310_configure,
1332         .unlock = l2c310_unlock,
1333         .outer_cache = {
1334                 .inv_range   = l2c210_inv_range,
1335                 .clean_range = l2c210_clean_range,
1336                 .flush_range = l2c210_flush_range,
1337                 .flush_all   = l2c210_flush_all,
1338                 .disable     = l2c310_disable,
1339                 .resume      = l2c310_resume,
1340         },
1341 };
1342
1343 /*
1344  * Note that the end addresses passed to Linux primitives are
1345  * noninclusive, while the hardware cache range operations use
1346  * inclusive start and end addresses.
1347  */
1348 static unsigned long aurora_range_end(unsigned long start, unsigned long end)
1349 {
1350         /*
1351          * Limit the number of cache lines processed at once,
1352          * since cache range operations stall the CPU pipeline
1353          * until completion.
1354          */
1355         if (end > start + MAX_RANGE_SIZE)
1356                 end = start + MAX_RANGE_SIZE;
1357
1358         /*
1359          * Cache range operations can't straddle a page boundary.
1360          */
1361         if (end > PAGE_ALIGN(start+1))
1362                 end = PAGE_ALIGN(start+1);
1363
1364         return end;
1365 }
1366
1367 static void aurora_pa_range(unsigned long start, unsigned long end,
1368                             unsigned long offset)
1369 {
1370         void __iomem *base = l2x0_base;
1371         unsigned long range_end;
1372         unsigned long flags;
1373
1374         /*
1375          * round start and end adresses up to cache line size
1376          */
1377         start &= ~(CACHE_LINE_SIZE - 1);
1378         end = ALIGN(end, CACHE_LINE_SIZE);
1379
1380         /*
1381          * perform operation on all full cache lines between 'start' and 'end'
1382          */
1383         while (start < end) {
1384                 range_end = aurora_range_end(start, end);
1385
1386                 raw_spin_lock_irqsave(&l2x0_lock, flags);
1387                 writel_relaxed(start, base + AURORA_RANGE_BASE_ADDR_REG);
1388                 writel_relaxed(range_end - CACHE_LINE_SIZE, base + offset);
1389                 raw_spin_unlock_irqrestore(&l2x0_lock, flags);
1390
1391                 writel_relaxed(0, base + AURORA_SYNC_REG);
1392                 start = range_end;
1393         }
1394 }
1395 static void aurora_inv_range(unsigned long start, unsigned long end)
1396 {
1397         aurora_pa_range(start, end, AURORA_INVAL_RANGE_REG);
1398 }
1399
1400 static void aurora_clean_range(unsigned long start, unsigned long end)
1401 {
1402         /*
1403          * If L2 is forced to WT, the L2 will always be clean and we
1404          * don't need to do anything here.
1405          */
1406         if (!l2_wt_override)
1407                 aurora_pa_range(start, end, AURORA_CLEAN_RANGE_REG);
1408 }
1409
1410 static void aurora_flush_range(unsigned long start, unsigned long end)
1411 {
1412         if (l2_wt_override)
1413                 aurora_pa_range(start, end, AURORA_INVAL_RANGE_REG);
1414         else
1415                 aurora_pa_range(start, end, AURORA_FLUSH_RANGE_REG);
1416 }
1417
1418 static void aurora_flush_all(void)
1419 {
1420         void __iomem *base = l2x0_base;
1421         unsigned long flags;
1422
1423         /* clean all ways */
1424         raw_spin_lock_irqsave(&l2x0_lock, flags);
1425         __l2c_op_way(base + L2X0_CLEAN_INV_WAY);
1426         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
1427
1428         writel_relaxed(0, base + AURORA_SYNC_REG);
1429 }
1430
1431 static void aurora_cache_sync(void)
1432 {
1433         writel_relaxed(0, l2x0_base + AURORA_SYNC_REG);
1434 }
1435
1436 static void aurora_disable(void)
1437 {
1438         void __iomem *base = l2x0_base;
1439         unsigned long flags;
1440
1441         raw_spin_lock_irqsave(&l2x0_lock, flags);
1442         __l2c_op_way(base + L2X0_CLEAN_INV_WAY);
1443         writel_relaxed(0, base + AURORA_SYNC_REG);
1444         l2c_write_sec(0, base, L2X0_CTRL);
1445         dsb(st);
1446         raw_spin_unlock_irqrestore(&l2x0_lock, flags);
1447 }
1448
1449 static void aurora_save(void __iomem *base)
1450 {
1451         l2x0_saved_regs.ctrl = readl_relaxed(base + L2X0_CTRL);
1452         l2x0_saved_regs.aux_ctrl = readl_relaxed(base + L2X0_AUX_CTRL);
1453 }
1454
1455 /*
1456  * For Aurora cache in no outer mode, enable via the CP15 coprocessor
1457  * broadcasting of cache commands to L2.
1458  */
1459 static void __init aurora_enable_no_outer(void __iomem *base,
1460         unsigned num_lock)
1461 {
1462         u32 u;
1463
1464         asm volatile("mrc p15, 1, %0, c15, c2, 0" : "=r" (u));
1465         u |= AURORA_CTRL_FW;            /* Set the FW bit */
1466         asm volatile("mcr p15, 1, %0, c15, c2, 0" : : "r" (u));
1467
1468         isb();
1469
1470         l2c_enable(base, num_lock);
1471 }
1472
1473 static void __init aurora_fixup(void __iomem *base, u32 cache_id,
1474         struct outer_cache_fns *fns)
1475 {
1476         sync_reg_offset = AURORA_SYNC_REG;
1477 }
1478
1479 static void __init aurora_of_parse(const struct device_node *np,
1480                                 u32 *aux_val, u32 *aux_mask)
1481 {
1482         u32 val = AURORA_ACR_REPLACEMENT_TYPE_SEMIPLRU;
1483         u32 mask =  AURORA_ACR_REPLACEMENT_MASK;
1484
1485         of_property_read_u32(np, "cache-id-part",
1486                         &cache_id_part_number_from_dt);
1487
1488         /* Determine and save the write policy */
1489         l2_wt_override = of_property_read_bool(np, "wt-override");
1490
1491         if (l2_wt_override) {
1492                 val |= AURORA_ACR_FORCE_WRITE_THRO_POLICY;
1493                 mask |= AURORA_ACR_FORCE_WRITE_POLICY_MASK;
1494         }
1495
1496         *aux_val &= ~mask;
1497         *aux_val |= val;
1498         *aux_mask &= ~mask;
1499 }
1500
1501 static const struct l2c_init_data of_aurora_with_outer_data __initconst = {
1502         .type = "Aurora",
1503         .way_size_0 = SZ_4K,
1504         .num_lock = 4,
1505         .of_parse = aurora_of_parse,
1506         .enable = l2c_enable,
1507         .fixup = aurora_fixup,
1508         .save  = aurora_save,
1509         .configure = l2c_configure,
1510         .unlock = l2c_unlock,
1511         .outer_cache = {
1512                 .inv_range   = aurora_inv_range,
1513                 .clean_range = aurora_clean_range,
1514                 .flush_range = aurora_flush_range,
1515                 .flush_all   = aurora_flush_all,
1516                 .disable     = aurora_disable,
1517                 .sync        = aurora_cache_sync,
1518                 .resume      = l2c_resume,
1519         },
1520 };
1521
1522 static const struct l2c_init_data of_aurora_no_outer_data __initconst = {
1523         .type = "Aurora",
1524         .way_size_0 = SZ_4K,
1525         .num_lock = 4,
1526         .of_parse = aurora_of_parse,
1527         .enable = aurora_enable_no_outer,
1528         .fixup = aurora_fixup,
1529         .save  = aurora_save,
1530         .configure = l2c_configure,
1531         .unlock = l2c_unlock,
1532         .outer_cache = {
1533                 .resume      = l2c_resume,
1534         },
1535 };
1536
1537 /*
1538  * For certain Broadcom SoCs, depending on the address range, different offsets
1539  * need to be added to the address before passing it to L2 for
1540  * invalidation/clean/flush
1541  *
1542  * Section Address Range              Offset        EMI
1543  *   1     0x00000000 - 0x3FFFFFFF    0x80000000    VC
1544  *   2     0x40000000 - 0xBFFFFFFF    0x40000000    SYS
1545  *   3     0xC0000000 - 0xFFFFFFFF    0x80000000    VC
1546  *
1547  * When the start and end addresses have crossed two different sections, we
1548  * need to break the L2 operation into two, each within its own section.
1549  * For example, if we need to invalidate addresses starts at 0xBFFF0000 and
1550  * ends at 0xC0001000, we need do invalidate 1) 0xBFFF0000 - 0xBFFFFFFF and 2)
1551  * 0xC0000000 - 0xC0001000
1552  *
1553  * Note 1:
1554  * By breaking a single L2 operation into two, we may potentially suffer some
1555  * performance hit, but keep in mind the cross section case is very rare
1556  *
1557  * Note 2:
1558  * We do not need to handle the case when the start address is in
1559  * Section 1 and the end address is in Section 3, since it is not a valid use
1560  * case
1561  *
1562  * Note 3:
1563  * Section 1 in practical terms can no longer be used on rev A2. Because of
1564  * that the code does not need to handle section 1 at all.
1565  *
1566  */
1567 #define BCM_SYS_EMI_START_ADDR        0x40000000UL
1568 #define BCM_VC_EMI_SEC3_START_ADDR    0xC0000000UL
1569
1570 #define BCM_SYS_EMI_OFFSET            0x40000000UL
1571 #define BCM_VC_EMI_OFFSET             0x80000000UL
1572
1573 static inline int bcm_addr_is_sys_emi(unsigned long addr)
1574 {
1575         return (addr >= BCM_SYS_EMI_START_ADDR) &&
1576                 (addr < BCM_VC_EMI_SEC3_START_ADDR);
1577 }
1578
1579 static inline unsigned long bcm_l2_phys_addr(unsigned long addr)
1580 {
1581         if (bcm_addr_is_sys_emi(addr))
1582                 return addr + BCM_SYS_EMI_OFFSET;
1583         else
1584                 return addr + BCM_VC_EMI_OFFSET;
1585 }
1586
1587 static void bcm_inv_range(unsigned long start, unsigned long end)
1588 {
1589         unsigned long new_start, new_end;
1590
1591         BUG_ON(start < BCM_SYS_EMI_START_ADDR);
1592
1593         if (unlikely(end <= start))
1594                 return;
1595
1596         new_start = bcm_l2_phys_addr(start);
1597         new_end = bcm_l2_phys_addr(end);
1598
1599         /* normal case, no cross section between start and end */
1600         if (likely(bcm_addr_is_sys_emi(end) || !bcm_addr_is_sys_emi(start))) {
1601                 l2c210_inv_range(new_start, new_end);
1602                 return;
1603         }
1604
1605         /* They cross sections, so it can only be a cross from section
1606          * 2 to section 3
1607          */
1608         l2c210_inv_range(new_start,
1609                 bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR-1));
1610         l2c210_inv_range(bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR),
1611                 new_end);
1612 }
1613
1614 static void bcm_clean_range(unsigned long start, unsigned long end)
1615 {
1616         unsigned long new_start, new_end;
1617
1618         BUG_ON(start < BCM_SYS_EMI_START_ADDR);
1619
1620         if (unlikely(end <= start))
1621                 return;
1622
1623         new_start = bcm_l2_phys_addr(start);
1624         new_end = bcm_l2_phys_addr(end);
1625
1626         /* normal case, no cross section between start and end */
1627         if (likely(bcm_addr_is_sys_emi(end) || !bcm_addr_is_sys_emi(start))) {
1628                 l2c210_clean_range(new_start, new_end);
1629                 return;
1630         }
1631
1632         /* They cross sections, so it can only be a cross from section
1633          * 2 to section 3
1634          */
1635         l2c210_clean_range(new_start,
1636                 bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR-1));
1637         l2c210_clean_range(bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR),
1638                 new_end);
1639 }
1640
1641 static void bcm_flush_range(unsigned long start, unsigned long end)
1642 {
1643         unsigned long new_start, new_end;
1644
1645         BUG_ON(start < BCM_SYS_EMI_START_ADDR);
1646
1647         if (unlikely(end <= start))
1648                 return;
1649
1650         if ((end - start) >= l2x0_size) {
1651                 outer_cache.flush_all();
1652                 return;
1653         }
1654
1655         new_start = bcm_l2_phys_addr(start);
1656         new_end = bcm_l2_phys_addr(end);
1657
1658         /* normal case, no cross section between start and end */
1659         if (likely(bcm_addr_is_sys_emi(end) || !bcm_addr_is_sys_emi(start))) {
1660                 l2c210_flush_range(new_start, new_end);
1661                 return;
1662         }
1663
1664         /* They cross sections, so it can only be a cross from section
1665          * 2 to section 3
1666          */
1667         l2c210_flush_range(new_start,
1668                 bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR-1));
1669         l2c210_flush_range(bcm_l2_phys_addr(BCM_VC_EMI_SEC3_START_ADDR),
1670                 new_end);
1671 }
1672
1673 /* Broadcom L2C-310 start from ARMs R3P2 or later, and require no fixups */
1674 static const struct l2c_init_data of_bcm_l2x0_data __initconst = {
1675         .type = "BCM-L2C-310",
1676         .way_size_0 = SZ_8K,
1677         .num_lock = 8,
1678         .of_parse = l2c310_of_parse,
1679         .enable = l2c310_enable,
1680         .save  = l2c310_save,
1681         .configure = l2c310_configure,
1682         .unlock = l2c310_unlock,
1683         .outer_cache = {
1684                 .inv_range   = bcm_inv_range,
1685                 .clean_range = bcm_clean_range,
1686                 .flush_range = bcm_flush_range,
1687                 .flush_all   = l2c210_flush_all,
1688                 .disable     = l2c310_disable,
1689                 .sync        = l2c210_sync,
1690                 .resume      = l2c310_resume,
1691         },
1692 };
1693
1694 static void __init tauros3_save(void __iomem *base)
1695 {
1696         l2c_save(base);
1697
1698         l2x0_saved_regs.aux2_ctrl =
1699                 readl_relaxed(base + TAUROS3_AUX2_CTRL);
1700         l2x0_saved_regs.prefetch_ctrl =
1701                 readl_relaxed(base + L310_PREFETCH_CTRL);
1702 }
1703
1704 static void tauros3_configure(void __iomem *base)
1705 {
1706         l2c_configure(base);
1707         writel_relaxed(l2x0_saved_regs.aux2_ctrl,
1708                        base + TAUROS3_AUX2_CTRL);
1709         writel_relaxed(l2x0_saved_regs.prefetch_ctrl,
1710                        base + L310_PREFETCH_CTRL);
1711 }
1712
1713 static const struct l2c_init_data of_tauros3_data __initconst = {
1714         .type = "Tauros3",
1715         .way_size_0 = SZ_8K,
1716         .num_lock = 8,
1717         .enable = l2c_enable,
1718         .save  = tauros3_save,
1719         .configure = tauros3_configure,
1720         .unlock = l2c_unlock,
1721         /* Tauros3 broadcasts L1 cache operations to L2 */
1722         .outer_cache = {
1723                 .resume      = l2c_resume,
1724         },
1725 };
1726
1727 #define L2C_ID(name, fns) { .compatible = name, .data = (void *)&fns }
1728 static const struct of_device_id l2x0_ids[] __initconst = {
1729         L2C_ID("arm,l210-cache", of_l2c210_data),
1730         L2C_ID("arm,l220-cache", of_l2c220_data),
1731         L2C_ID("arm,pl310-cache", of_l2c310_data),
1732         L2C_ID("brcm,bcm11351-a2-pl310-cache", of_bcm_l2x0_data),
1733         L2C_ID("marvell,aurora-outer-cache", of_aurora_with_outer_data),
1734         L2C_ID("marvell,aurora-system-cache", of_aurora_no_outer_data),
1735         L2C_ID("marvell,tauros3-cache", of_tauros3_data),
1736         /* Deprecated IDs */
1737         L2C_ID("bcm,bcm11351-a2-pl310-cache", of_bcm_l2x0_data),
1738         {}
1739 };
1740
1741 int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
1742 {
1743         const struct l2c_init_data *data;
1744         struct device_node *np;
1745         struct resource res;
1746         u32 cache_id, old_aux;
1747         u32 cache_level = 2;
1748         bool nosync = false;
1749
1750         np = of_find_matching_node(NULL, l2x0_ids);
1751         if (!np)
1752                 return -ENODEV;
1753
1754         if (of_address_to_resource(np, 0, &res))
1755                 return -ENODEV;
1756
1757         l2x0_base = ioremap(res.start, resource_size(&res));
1758         if (!l2x0_base)
1759                 return -ENOMEM;
1760
1761         l2x0_saved_regs.phy_base = res.start;
1762
1763         data = of_match_node(l2x0_ids, np)->data;
1764
1765         if (of_device_is_compatible(np, "arm,pl310-cache") &&
1766             of_property_read_bool(np, "arm,io-coherent"))
1767                 data = &of_l2c310_coherent_data;
1768
1769         old_aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
1770         if (old_aux != ((old_aux & aux_mask) | aux_val)) {
1771                 pr_warn("L2C: platform modifies aux control register: 0x%08x -> 0x%08x\n",
1772                         old_aux, (old_aux & aux_mask) | aux_val);
1773         } else if (aux_mask != ~0U && aux_val != 0) {
1774                 pr_alert("L2C: platform provided aux values match the hardware, so have no effect.  Please remove them.\n");
1775         }
1776
1777         /* All L2 caches are unified, so this property should be specified */
1778         if (!of_property_read_bool(np, "cache-unified"))
1779                 pr_err("L2C: device tree omits to specify unified cache\n");
1780
1781         if (of_property_read_u32(np, "cache-level", &cache_level))
1782                 pr_err("L2C: device tree omits to specify cache-level\n");
1783
1784         if (cache_level != 2)
1785                 pr_err("L2C: device tree specifies invalid cache level\n");
1786
1787         nosync = of_property_read_bool(np, "arm,outer-sync-disable");
1788
1789         /* Read back current (default) hardware configuration */
1790         if (data->save)
1791                 data->save(l2x0_base);
1792
1793         /* L2 configuration can only be changed if the cache is disabled */
1794         if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN))
1795                 if (data->of_parse)
1796                         data->of_parse(np, &aux_val, &aux_mask);
1797
1798         if (cache_id_part_number_from_dt)
1799                 cache_id = cache_id_part_number_from_dt;
1800         else
1801                 cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
1802
1803         return __l2c_init(data, aux_val, aux_mask, cache_id, nosync);
1804 }
1805 #endif