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/init.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/io.h>
  22
  23 #include <asm/cacheflush.h>
  24 #include <asm/hardware/cache-l2x0.h>
  25
  26 #define CACHE_LINE_SIZE         32
  27
  28 static void __iomem *l2x0_base;
  29 static DEFINE_SPINLOCK(l2x0_lock);
  30 static uint32_t l2x0_way_mask;  /* Bitmask of active ways */
  31 static uint32_t l2x0_size;
  32 static u32 l2x0_cache_id;
  33 static unsigned int l2x0_sets;
  34 static unsigned int l2x0_ways;
  35
  36 static inline bool is_pl310_rev(int rev)
  37 {
  38         return (l2x0_cache_id &
  39                 (L2X0_CACHE_ID_PART_MASK | L2X0_CACHE_ID_REV_MASK)) ==
  40                         (L2X0_CACHE_ID_PART_L310 | rev);
  41 }
  42
  43 static inline void cache_wait_way(void __iomem *reg, unsigned long mask)
  44 {
  45         /* wait for cache operation by line or way to complete */
  46         while (readl_relaxed(reg) & mask)
  47                 ;
  48 }
  49
  50 #ifdef CONFIG_CACHE_PL310
  51 static inline void cache_wait(void __iomem *reg, unsigned long mask)
  52 {
  53         /* cache operations by line are atomic on PL310 */
  54 }
  55 #else
  56 #define cache_wait      cache_wait_way
  57 #endif
  58
  59 static inline void cache_sync(void)
  60 {
  61         void __iomem *base = l2x0_base;
  62
  63 #ifdef CONFIG_ARM_ERRATA_753970
  64         /* write to an unmmapped register */
  65         writel_relaxed(0, base + L2X0_DUMMY_REG);
  66 #else
  67         writel_relaxed(0, base + L2X0_CACHE_SYNC);
  68 #endif
  69         cache_wait(base + L2X0_CACHE_SYNC, 1);
  70 }
  71
  72 static inline void l2x0_clean_line(unsigned long addr)
  73 {
  74         void __iomem *base = l2x0_base;
  75         cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
  76         writel_relaxed(addr, base + L2X0_CLEAN_LINE_PA);
  77 }
  78
  79 static inline void l2x0_inv_line(unsigned long addr)
  80 {
  81         void __iomem *base = l2x0_base;
  82         cache_wait(base + L2X0_INV_LINE_PA, 1);
  83         writel_relaxed(addr, base + L2X0_INV_LINE_PA);
  84 }
  85
  86 #if defined(CONFIG_PL310_ERRATA_588369) || defined(CONFIG_PL310_ERRATA_727915)
  87
  88 #define debug_writel(val)       outer_cache.set_debug(val)
  89
  90 static void l2x0_set_debug(unsigned long val)
  91 {
  92         writel_relaxed(val, l2x0_base + L2X0_DEBUG_CTRL);
  93 }
  94 #else
  95 /* Optimised out for non-errata case */
  96 static inline void debug_writel(unsigned long val)
  97 {
  98 }
  99
 100 #define l2x0_set_debug  NULL
 101 #endif
 102
 103 #ifdef CONFIG_PL310_ERRATA_588369
 104 static inline void l2x0_flush_line(unsigned long addr)
 105 {
 106         void __iomem *base = l2x0_base;
 107
 108         /* Clean by PA followed by Invalidate by PA */
 109         cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
 110         writel_relaxed(addr, base + L2X0_CLEAN_LINE_PA);
 111         cache_wait(base + L2X0_INV_LINE_PA, 1);
 112         writel_relaxed(addr, base + L2X0_INV_LINE_PA);
 113 }
 114 #else
 115
 116 static inline void l2x0_flush_line(unsigned long addr)
 117 {
 118         void __iomem *base = l2x0_base;
 119         cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
 120         writel_relaxed(addr, base + L2X0_CLEAN_INV_LINE_PA);
 121 }
 122 #endif
 123
 124 static void l2x0_cache_sync(void)
 125 {
 126         unsigned long flags;
 127
 128         spin_lock_irqsave(&l2x0_lock, flags);
 129         cache_sync();
 130         spin_unlock_irqrestore(&l2x0_lock, flags);
 131 }
 132
 133 #ifdef CONFIG_PL310_ERRATA_727915
 134 static void l2x0_for_each_set_way(void __iomem *reg)
 135 {
 136         int set;
 137         int way;
 138         unsigned long flags;
 139
 140         for (way = 0; way < l2x0_ways; way++) {
 141                 spin_lock_irqsave(&l2x0_lock, flags);
 142                 for (set = 0; set < l2x0_sets; set++)
 143                         writel_relaxed((way << 28) | (set << 5), reg);
 144                 cache_sync();
 145                 spin_unlock_irqrestore(&l2x0_lock, flags);
 146         }
 147 }
 148 #endif
 149
 150 static void __l2x0_flush_all(void)
 151 {
 152         debug_writel(0x03);
 153         writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_INV_WAY);
 154         cache_wait_way(l2x0_base + L2X0_CLEAN_INV_WAY, l2x0_way_mask);
 155         cache_sync();
 156         debug_writel(0x00);
 157 }
 158
 159 static void l2x0_flush_all(void)
 160 {
 161         unsigned long flags;
 162
 163 #ifdef CONFIG_PL310_ERRATA_727915
 164         if (is_pl310_rev(REV_PL310_R2P0)) {
 165                 l2x0_for_each_set_way(l2x0_base + L2X0_CLEAN_INV_LINE_IDX);
 166                 return;
 167         }
 168 #endif
 169
 170         /* clean all ways */
 171         spin_lock_irqsave(&l2x0_lock, flags);
 172         __l2x0_flush_all();
 173         spin_unlock_irqrestore(&l2x0_lock, flags);
 174 }
 175
 176 static void l2x0_clean_all(void)
 177 {
 178         unsigned long flags;
 179
 180 #ifdef CONFIG_PL310_ERRATA_727915
 181         if (is_pl310_rev(REV_PL310_R2P0)) {
 182                 l2x0_for_each_set_way(l2x0_base + L2X0_CLEAN_LINE_IDX);
 183                 return;
 184         }
 185 #endif
 186
 187         /* clean all ways */
 188         spin_lock_irqsave(&l2x0_lock, flags);
 189         debug_writel(0x03);
 190         writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_WAY);
 191         cache_wait_way(l2x0_base + L2X0_CLEAN_WAY, l2x0_way_mask);
 192         cache_sync();
 193         debug_writel(0x00);
 194         spin_unlock_irqrestore(&l2x0_lock, flags);
 195 }
 196
 197 static void l2x0_inv_all(void)
 198 {
 199         unsigned long flags;
 200
 201         /* invalidate all ways */
 202         spin_lock_irqsave(&l2x0_lock, flags);
 203         /* Invalidating when L2 is enabled is a nono */
 204         BUG_ON(readl(l2x0_base + L2X0_CTRL) & 1);
 205         writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
 206         cache_wait_way(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
 207         cache_sync();
 208         spin_unlock_irqrestore(&l2x0_lock, flags);
 209 }
 210
 211 static void l2x0_inv_range(unsigned long start, unsigned long end)
 212 {
 213         void __iomem *base = l2x0_base;
 214         unsigned long flags;
 215
 216         spin_lock_irqsave(&l2x0_lock, flags);
 217         if (start & (CACHE_LINE_SIZE - 1)) {
 218                 start &= ~(CACHE_LINE_SIZE - 1);
 219                 debug_writel(0x03);
 220                 l2x0_flush_line(start);
 221                 debug_writel(0x00);
 222                 start += CACHE_LINE_SIZE;
 223         }
 224
 225         if (end & (CACHE_LINE_SIZE - 1)) {
 226                 end &= ~(CACHE_LINE_SIZE - 1);
 227                 debug_writel(0x03);
 228                 l2x0_flush_line(end);
 229                 debug_writel(0x00);
 230         }
 231
 232         while (start < end) {
 233                 unsigned long blk_end = start + min(end - start, 4096UL);
 234
 235                 while (start < blk_end) {
 236                         l2x0_inv_line(start);
 237                         start += CACHE_LINE_SIZE;
 238                 }
 239
 240                 if (blk_end < end) {
 241                         spin_unlock_irqrestore(&l2x0_lock, flags);
 242                         spin_lock_irqsave(&l2x0_lock, flags);
 243                 }
 244         }
 245         cache_wait(base + L2X0_INV_LINE_PA, 1);
 246         cache_sync();
 247         spin_unlock_irqrestore(&l2x0_lock, flags);
 248 }
 249
 250 static void l2x0_clean_range(unsigned long start, unsigned long end)
 251 {
 252         void __iomem *base = l2x0_base;
 253         unsigned long flags;
 254
 255         if ((end - start) >= l2x0_size) {
 256                 l2x0_clean_all();
 257                 return;
 258         }
 259
 260         spin_lock_irqsave(&l2x0_lock, flags);
 261         start &= ~(CACHE_LINE_SIZE - 1);
 262         while (start < end) {
 263                 unsigned long blk_end = start + min(end - start, 4096UL);
 264
 265                 while (start < blk_end) {
 266                         l2x0_clean_line(start);
 267                         start += CACHE_LINE_SIZE;
 268                 }
 269
 270                 if (blk_end < end) {
 271                         spin_unlock_irqrestore(&l2x0_lock, flags);
 272                         spin_lock_irqsave(&l2x0_lock, flags);
 273                 }
 274         }
 275         cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
 276         cache_sync();
 277         spin_unlock_irqrestore(&l2x0_lock, flags);
 278 }
 279
 280 static void l2x0_flush_range(unsigned long start, unsigned long end)
 281 {
 282         void __iomem *base = l2x0_base;
 283         unsigned long flags;
 284
 285         if ((end - start) >= l2x0_size) {
 286                 l2x0_flush_all();
 287                 return;
 288         }
 289
 290         spin_lock_irqsave(&l2x0_lock, flags);
 291         start &= ~(CACHE_LINE_SIZE - 1);
 292         while (start < end) {
 293                 unsigned long blk_end = start + min(end - start, 4096UL);
 294
 295                 debug_writel(0x03);
 296                 while (start < blk_end) {
 297                         l2x0_flush_line(start);
 298                         start += CACHE_LINE_SIZE;
 299                 }
 300                 debug_writel(0x00);
 301
 302                 if (blk_end < end) {
 303                         spin_unlock_irqrestore(&l2x0_lock, flags);
 304                         spin_lock_irqsave(&l2x0_lock, flags);
 305                 }
 306         }
 307         cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
 308         cache_sync();
 309         spin_unlock_irqrestore(&l2x0_lock, flags);
 310 }
 311
 312 static void l2x0_disable(void)
 313 {
 314         unsigned long flags;
 315
 316         spin_lock_irqsave(&l2x0_lock, flags);
 317         __l2x0_flush_all();
 318         writel_relaxed(0, l2x0_base + L2X0_CTRL);
 319         dsb();
 320         spin_unlock_irqrestore(&l2x0_lock, flags);
 321 }
 322
 323 void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
 324 {
 325         __u32 aux;
 326         __u32 way_size = 0;
 327         const char *type;
 328
 329         l2x0_base = base;
 330
 331         l2x0_cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
 332         aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 333
 334         aux &= aux_mask;
 335         aux |= aux_val;
 336
 337         /* Determine the number of ways */
 338         switch (l2x0_cache_id & L2X0_CACHE_ID_PART_MASK) {
 339         case L2X0_CACHE_ID_PART_L310:
 340                 if (aux & (1 << 16))
 341                         l2x0_ways = 16;
 342                 else
 343                         l2x0_ways = 8;
 344                 type = "L310";
 345                 break;
 346         case L2X0_CACHE_ID_PART_L210:
 347                 l2x0_ways = (aux >> 13) & 0xf;
 348                 type = "L210";
 349                 break;
 350         default:
 351                 /* Assume unknown chips have 8 ways */
 352                 l2x0_ways = 8;
 353                 type = "L2x0 series";
 354                 break;
 355         }
 356
 357         l2x0_way_mask = (1 << l2x0_ways) - 1;
 358
 359         /*
 360          * L2 cache Size =  Way size * Number of ways
 361          */
 362         way_size = (aux & L2X0_AUX_CTRL_WAY_SIZE_MASK) >> 17;
 363         way_size = SZ_1K << (way_size + 3);
 364         l2x0_size = l2x0_ways * way_size;
 365         l2x0_sets = way_size / CACHE_LINE_SIZE;
 366
 367         /*
 368          * Check if l2x0 controller is already enabled.
 369          * If you are booting from non-secure mode
 370          * accessing the below registers will fault.
 371          */
 372         if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
 373
 374                 /* l2x0 controller is disabled */
 375                 writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);
 376
 377                 l2x0_inv_all();
 378
 379                 /* enable L2X0 */
 380                 writel_relaxed(1, l2x0_base + L2X0_CTRL);
 381         }
 382
 383         outer_cache.inv_range = l2x0_inv_range;
 384         outer_cache.clean_range = l2x0_clean_range;
 385         outer_cache.flush_range = l2x0_flush_range;
 386         outer_cache.sync = l2x0_cache_sync;
 387         outer_cache.flush_all = l2x0_flush_all;
 388         outer_cache.inv_all = l2x0_inv_all;
 389         outer_cache.disable = l2x0_disable;
 390         outer_cache.set_debug = l2x0_set_debug;
 391
 392         printk(KERN_INFO "%s cache controller enabled\n", type);
 393         printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x, Cache size: %d B\n",
 394                         l2x0_ways, l2x0_cache_id, aux, l2x0_size);
 395 }