release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/mm/c-tx39.c

   1 /*
   2  * r2300.c: R2000 and R3000 specific mmu/cache code.
   3  *
   4  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
   5  *
   6  * with a lot of changes to make this thing work for R3000s
   7  * Tx39XX R4k style caches added. HK
   8  * Copyright (C) 1998, 1999, 2000 Harald Koerfgen
   9  * Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
  10  */
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/smp.h>
  15 #include <linux/mm.h>
  16
  17 #include <asm/cacheops.h>
  18 #include <asm/page.h>
  19 #include <asm/pgtable.h>
  20 #include <asm/mmu_context.h>
  21 #include <asm/system.h>
  22 #include <asm/isadep.h>
  23 #include <asm/io.h>
  24 #include <asm/bootinfo.h>
  25 #include <asm/cpu.h>
  26
  27 /* For R3000 cores with R4000 style caches */
  28 static unsigned long icache_size, dcache_size;          /* Size in bytes */
  29
  30 #include <asm/r4kcache.h>
  31
  32 extern int r3k_have_wired_reg;  /* in r3k-tlb.c */
  33
  34 /* This sequence is required to ensure icache is disabled immediately */
  35 #define TX39_STOP_STREAMING() \
  36 __asm__ __volatile__( \
  37         ".set    push\n\t" \
  38         ".set    noreorder\n\t" \
  39         "b       1f\n\t" \
  40         "nop\n\t" \
  41         "1:\n\t" \
  42         ".set pop" \
  43         )
  44
  45 /* TX39H-style cache flush routines. */
  46 static void tx39h_flush_icache_all(void)
  47 {
  48         unsigned long flags, config;
  49
  50         /* disable icache (set ICE#) */
  51         local_irq_save(flags);
  52         config = read_c0_conf();
  53         write_c0_conf(config & ~TX39_CONF_ICE);
  54         TX39_STOP_STREAMING();
  55         blast_icache16();
  56         write_c0_conf(config);
  57         local_irq_restore(flags);
  58 }
  59
  60 static void tx39h_dma_cache_wback_inv(unsigned long addr, unsigned long size)
  61 {
  62         /* Catch bad driver code */
  63         BUG_ON(size == 0);
  64
  65         iob();
  66         blast_inv_dcache_range(addr, addr + size);
  67 }
  68
  69
  70 /* TX39H2,TX39H3 */
  71 static inline void tx39_blast_dcache_page(unsigned long addr)
  72 {
  73         if (current_cpu_type() != CPU_TX3912)
  74                 blast_dcache16_page(addr);
  75 }
  76
  77 static inline void tx39_blast_dcache_page_indexed(unsigned long addr)
  78 {
  79         blast_dcache16_page_indexed(addr);
  80 }
  81
  82 static inline void tx39_blast_dcache(void)
  83 {
  84         blast_dcache16();
  85 }
  86
  87 static inline void tx39_blast_icache_page(unsigned long addr)
  88 {
  89         unsigned long flags, config;
  90         /* disable icache (set ICE#) */
  91         local_irq_save(flags);
  92         config = read_c0_conf();
  93         write_c0_conf(config & ~TX39_CONF_ICE);
  94         TX39_STOP_STREAMING();
  95         blast_icache16_page(addr);
  96         write_c0_conf(config);
  97         local_irq_restore(flags);
  98 }
  99
 100 static inline void tx39_blast_icache_page_indexed(unsigned long addr)
 101 {
 102         unsigned long flags, config;
 103         /* disable icache (set ICE#) */
 104         local_irq_save(flags);
 105         config = read_c0_conf();
 106         write_c0_conf(config & ~TX39_CONF_ICE);
 107         TX39_STOP_STREAMING();
 108         blast_icache16_page_indexed(addr);
 109         write_c0_conf(config);
 110         local_irq_restore(flags);
 111 }
 112
 113 static inline void tx39_blast_icache(void)
 114 {
 115         unsigned long flags, config;
 116         /* disable icache (set ICE#) */
 117         local_irq_save(flags);
 118         config = read_c0_conf();
 119         write_c0_conf(config & ~TX39_CONF_ICE);
 120         TX39_STOP_STREAMING();
 121         blast_icache16();
 122         write_c0_conf(config);
 123         local_irq_restore(flags);
 124 }
 125
 126 static void tx39__flush_cache_vmap(void)
 127 {
 128         tx39_blast_dcache();
 129 }
 130
 131 static void tx39__flush_cache_vunmap(void)
 132 {
 133         tx39_blast_dcache();
 134 }
 135
 136 static inline void tx39_flush_cache_all(void)
 137 {
 138         if (!cpu_has_dc_aliases)
 139                 return;
 140
 141         tx39_blast_dcache();
 142 }
 143
 144 static inline void tx39___flush_cache_all(void)
 145 {
 146         tx39_blast_dcache();
 147         tx39_blast_icache();
 148 }
 149
 150 static void tx39_flush_cache_mm(struct mm_struct *mm)
 151 {
 152         if (!cpu_has_dc_aliases)
 153                 return;
 154
 155         if (cpu_context(smp_processor_id(), mm) != 0)
 156                 tx39_blast_dcache();
 157 }
 158
 159 static void tx39_flush_cache_range(struct vm_area_struct *vma,
 160         unsigned long start, unsigned long end)
 161 {
 162         if (!cpu_has_dc_aliases)
 163                 return;
 164         if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
 165                 return;
 166
 167         tx39_blast_dcache();
 168 }
 169
 170 static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page, unsigned long pfn)
 171 {
 172         int exec = vma->vm_flags & VM_EXEC;
 173         struct mm_struct *mm = vma->vm_mm;
 174         pgd_t *pgdp;
 175         pud_t *pudp;
 176         pmd_t *pmdp;
 177         pte_t *ptep;
 178
 179         /*
 180          * If ownes no valid ASID yet, cannot possibly have gotten
 181          * this page into the cache.
 182          */
 183         if (cpu_context(smp_processor_id(), mm) == 0)
 184                 return;
 185
 186         page &= PAGE_MASK;
 187         pgdp = pgd_offset(mm, page);
 188         pudp = pud_offset(pgdp, page);
 189         pmdp = pmd_offset(pudp, page);
 190         ptep = pte_offset(pmdp, page);
 191
 192         /*
 193          * If the page isn't marked valid, the page cannot possibly be
 194          * in the cache.
 195          */
 196         if (!(pte_val(*ptep) & _PAGE_PRESENT))
 197                 return;
 198
 199         /*
 200          * Doing flushes for another ASID than the current one is
 201          * too difficult since stupid R4k caches do a TLB translation
 202          * for every cache flush operation.  So we do indexed flushes
 203          * in that case, which doesn't overly flush the cache too much.
 204          */
 205         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
 206                 if (cpu_has_dc_aliases || exec)
 207                         tx39_blast_dcache_page(page);
 208                 if (exec)
 209                         tx39_blast_icache_page(page);
 210
 211                 return;
 212         }
 213
 214         /*
 215          * Do indexed flush, too much work to get the (possible) TLB refills
 216          * to work correctly.
 217          */
 218         if (cpu_has_dc_aliases || exec)
 219                 tx39_blast_dcache_page_indexed(page);
 220         if (exec)
 221                 tx39_blast_icache_page_indexed(page);
 222 }
 223
 224 static void local_tx39_flush_data_cache_page(void * addr)
 225 {
 226         tx39_blast_dcache_page((unsigned long)addr);
 227 }
 228
 229 static void tx39_flush_data_cache_page(unsigned long addr)
 230 {
 231         tx39_blast_dcache_page(addr);
 232 }
 233
 234 static void tx39_flush_icache_range(unsigned long start, unsigned long end)
 235 {
 236         if (end - start > dcache_size)
 237                 tx39_blast_dcache();
 238         else
 239                 protected_blast_dcache_range(start, end);
 240
 241         if (end - start > icache_size)
 242                 tx39_blast_icache();
 243         else {
 244                 unsigned long flags, config;
 245                 /* disable icache (set ICE#) */
 246                 local_irq_save(flags);
 247                 config = read_c0_conf();
 248                 write_c0_conf(config & ~TX39_CONF_ICE);
 249                 TX39_STOP_STREAMING();
 250                 protected_blast_icache_range(start, end);
 251                 write_c0_conf(config);
 252                 local_irq_restore(flags);
 253         }
 254 }
 255
 256 static void tx39_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 257 {
 258         unsigned long end;
 259
 260         if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
 261                 end = addr + size;
 262                 do {
 263                         tx39_blast_dcache_page(addr);
 264                         addr += PAGE_SIZE;
 265                 } while(addr != end);
 266         } else if (size > dcache_size) {
 267                 tx39_blast_dcache();
 268         } else {
 269                 blast_dcache_range(addr, addr + size);
 270         }
 271 }
 272
 273 static void tx39_dma_cache_inv(unsigned long addr, unsigned long size)
 274 {
 275         unsigned long end;
 276
 277         if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
 278                 end = addr + size;
 279                 do {
 280                         tx39_blast_dcache_page(addr);
 281                         addr += PAGE_SIZE;
 282                 } while(addr != end);
 283         } else if (size > dcache_size) {
 284                 tx39_blast_dcache();
 285         } else {
 286                 blast_inv_dcache_range(addr, addr + size);
 287         }
 288 }
 289
 290 static void tx39_flush_cache_sigtramp(unsigned long addr)
 291 {
 292         unsigned long ic_lsize = current_cpu_data.icache.linesz;
 293         unsigned long dc_lsize = current_cpu_data.dcache.linesz;
 294         unsigned long config;
 295         unsigned long flags;
 296
 297         protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 298
 299         /* disable icache (set ICE#) */
 300         local_irq_save(flags);
 301         config = read_c0_conf();
 302         write_c0_conf(config & ~TX39_CONF_ICE);
 303         TX39_STOP_STREAMING();
 304         protected_flush_icache_line(addr & ~(ic_lsize - 1));
 305         write_c0_conf(config);
 306         local_irq_restore(flags);
 307 }
 308
 309 static __init void tx39_probe_cache(void)
 310 {
 311         unsigned long config;
 312
 313         config = read_c0_conf();
 314
 315         icache_size = 1 << (10 + ((config & TX39_CONF_ICS_MASK) >>
 316                                   TX39_CONF_ICS_SHIFT));
 317         dcache_size = 1 << (10 + ((config & TX39_CONF_DCS_MASK) >>
 318                                   TX39_CONF_DCS_SHIFT));
 319
 320         current_cpu_data.icache.linesz = 16;
 321         switch (current_cpu_type()) {
 322         case CPU_TX3912:
 323                 current_cpu_data.icache.ways = 1;
 324                 current_cpu_data.dcache.ways = 1;
 325                 current_cpu_data.dcache.linesz = 4;
 326                 break;
 327
 328         case CPU_TX3927:
 329                 current_cpu_data.icache.ways = 2;
 330                 current_cpu_data.dcache.ways = 2;
 331                 current_cpu_data.dcache.linesz = 16;
 332                 break;
 333
 334         case CPU_TX3922:
 335         default:
 336                 current_cpu_data.icache.ways = 1;
 337                 current_cpu_data.dcache.ways = 1;
 338                 current_cpu_data.dcache.linesz = 16;
 339                 break;
 340         }
 341 }
 342
 343 void __cpuinit tx39_cache_init(void)
 344 {
 345         extern void build_clear_page(void);
 346         extern void build_copy_page(void);
 347         unsigned long config;
 348
 349         config = read_c0_conf();
 350         config &= ~TX39_CONF_WBON;
 351         write_c0_conf(config);
 352
 353         tx39_probe_cache();
 354
 355         switch (current_cpu_type()) {
 356         case CPU_TX3912:
 357                 /* TX39/H core (writethru direct-map cache) */
 358                 __flush_cache_vmap      = tx39__flush_cache_vmap;
 359                 __flush_cache_vunmap    = tx39__flush_cache_vunmap;
 360                 flush_cache_all = tx39h_flush_icache_all;
 361                 __flush_cache_all       = tx39h_flush_icache_all;
 362                 flush_cache_mm          = (void *) tx39h_flush_icache_all;
 363                 flush_cache_range       = (void *) tx39h_flush_icache_all;
 364                 flush_cache_page        = (void *) tx39h_flush_icache_all;
 365                 flush_icache_range      = (void *) tx39h_flush_icache_all;
 366                 local_flush_icache_range = (void *) tx39h_flush_icache_all;
 367
 368                 flush_cache_sigtramp    = (void *) tx39h_flush_icache_all;
 369                 local_flush_data_cache_page     = (void *) tx39h_flush_icache_all;
 370                 flush_data_cache_page   = (void *) tx39h_flush_icache_all;
 371
 372                 _dma_cache_wback_inv    = tx39h_dma_cache_wback_inv;
 373
 374                 shm_align_mask          = PAGE_SIZE - 1;
 375
 376                 break;
 377
 378         case CPU_TX3922:
 379         case CPU_TX3927:
 380         default:
 381                 /* TX39/H2,H3 core (writeback 2way-set-associative cache) */
 382                 r3k_have_wired_reg = 1;
 383                 write_c0_wired(0);      /* set 8 on reset... */
 384                 /* board-dependent init code may set WBON */
 385
 386                 __flush_cache_vmap      = tx39__flush_cache_vmap;
 387                 __flush_cache_vunmap    = tx39__flush_cache_vunmap;
 388
 389                 flush_cache_all = tx39_flush_cache_all;
 390                 __flush_cache_all = tx39___flush_cache_all;
 391                 flush_cache_mm = tx39_flush_cache_mm;
 392                 flush_cache_range = tx39_flush_cache_range;
 393                 flush_cache_page = tx39_flush_cache_page;
 394                 flush_icache_range = tx39_flush_icache_range;
 395                 local_flush_icache_range = tx39_flush_icache_range;
 396
 397                 flush_cache_sigtramp = tx39_flush_cache_sigtramp;
 398                 local_flush_data_cache_page = local_tx39_flush_data_cache_page;
 399                 flush_data_cache_page = tx39_flush_data_cache_page;
 400
 401                 _dma_cache_wback_inv = tx39_dma_cache_wback_inv;
 402                 _dma_cache_wback = tx39_dma_cache_wback_inv;
 403                 _dma_cache_inv = tx39_dma_cache_inv;
 404
 405                 shm_align_mask = max_t(unsigned long,
 406                                        (dcache_size / current_cpu_data.dcache.ways) - 1,
 407                                        PAGE_SIZE - 1);
 408
 409                 break;
 410         }
 411
 412         current_cpu_data.icache.waysize = icache_size / current_cpu_data.icache.ways;
 413         current_cpu_data.dcache.waysize = dcache_size / current_cpu_data.dcache.ways;
 414
 415         current_cpu_data.icache.sets =
 416                 current_cpu_data.icache.waysize / current_cpu_data.icache.linesz;
 417         current_cpu_data.dcache.sets =
 418                 current_cpu_data.dcache.waysize / current_cpu_data.dcache.linesz;
 419
 420         if (current_cpu_data.dcache.waysize > PAGE_SIZE)
 421                 current_cpu_data.dcache.flags |= MIPS_CACHE_ALIASES;
 422
 423         current_cpu_data.icache.waybit = 0;
 424         current_cpu_data.dcache.waybit = 0;
 425
 426         printk("Primary instruction cache %ldkB, linesize %d bytes\n",
 427                 icache_size >> 10, current_cpu_data.icache.linesz);
 428         printk("Primary data cache %ldkB, linesize %d bytes\n",
 429                 dcache_size >> 10, current_cpu_data.dcache.linesz);
 430
 431         build_clear_page();
 432         build_copy_page();
 433         tx39h_flush_icache_all();
 434 }