kernel/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 (davem@davemloft.net)
   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/isadep.h>
  22 #include <asm/io.h>
  23 #include <asm/bootinfo.h>
  24 #include <asm/cpu.h>
  25
  26 /* For R3000 cores with R4000 style caches */
  27 static unsigned long icache_size, dcache_size;          /* Size in bytes */
  28
  29 #include <asm/r4kcache.h>
  30
  31 extern int r3k_have_wired_reg;  /* in r3k-tlb.c */
  32
  33 /* This sequence is required to ensure icache is disabled immediately */
  34 #define TX39_STOP_STREAMING() \
  35 __asm__ __volatile__( \
  36         ".set    push\n\t" \
  37         ".set    noreorder\n\t" \
  38         "b       1f\n\t" \
  39         "nop\n\t" \
  40         "1:\n\t" \
  41         ".set pop" \
  42         )
  43
  44 /* TX39H-style cache flush routines. */
  45 static void tx39h_flush_icache_all(void)
  46 {
  47         unsigned long flags, config;
  48
  49         /* disable icache (set ICE#) */
  50         local_irq_save(flags);
  51         config = read_c0_conf();
  52         write_c0_conf(config & ~TX39_CONF_ICE);
  53         TX39_STOP_STREAMING();
  54         blast_icache16();
  55         write_c0_conf(config);
  56         local_irq_restore(flags);
  57 }
  58
  59 static void tx39h_dma_cache_wback_inv(unsigned long addr, unsigned long size)
  60 {
  61         /* Catch bad driver code */
  62         BUG_ON(size == 0);
  63
  64         iob();
  65         blast_inv_dcache_range(addr, addr + size);
  66 }
  67
  68
  69 /* TX39H2,TX39H3 */
  70 static inline void tx39_blast_dcache_page(unsigned long addr)
  71 {
  72         if (current_cpu_type() != CPU_TX3912)
  73                 blast_dcache16_page(addr);
  74 }
  75
  76 static inline void tx39_blast_dcache_page_indexed(unsigned long addr)
  77 {
  78         blast_dcache16_page_indexed(addr);
  79 }
  80
  81 static inline void tx39_blast_dcache(void)
  82 {
  83         blast_dcache16();
  84 }
  85
  86 static inline void tx39_blast_icache_page(unsigned long addr)
  87 {
  88         unsigned long flags, config;
  89         /* disable icache (set ICE#) */
  90         local_irq_save(flags);
  91         config = read_c0_conf();
  92         write_c0_conf(config & ~TX39_CONF_ICE);
  93         TX39_STOP_STREAMING();
  94         blast_icache16_page(addr);
  95         write_c0_conf(config);
  96         local_irq_restore(flags);
  97 }
  98
  99 static inline void tx39_blast_icache_page_indexed(unsigned long addr)
 100 {
 101         unsigned long flags, config;
 102         /* disable icache (set ICE#) */
 103         local_irq_save(flags);
 104         config = read_c0_conf();
 105         write_c0_conf(config & ~TX39_CONF_ICE);
 106         TX39_STOP_STREAMING();
 107         blast_icache16_page_indexed(addr);
 108         write_c0_conf(config);
 109         local_irq_restore(flags);
 110 }
 111
 112 static inline void tx39_blast_icache(void)
 113 {
 114         unsigned long flags, config;
 115         /* disable icache (set ICE#) */
 116         local_irq_save(flags);
 117         config = read_c0_conf();
 118         write_c0_conf(config & ~TX39_CONF_ICE);
 119         TX39_STOP_STREAMING();
 120         blast_icache16();
 121         write_c0_conf(config);
 122         local_irq_restore(flags);
 123 }
 124
 125 static void tx39__flush_cache_vmap(void)
 126 {
 127         tx39_blast_dcache();
 128 }
 129
 130 static void tx39__flush_cache_vunmap(void)
 131 {
 132         tx39_blast_dcache();
 133 }
 134
 135 static inline void tx39_flush_cache_all(void)
 136 {
 137         if (!cpu_has_dc_aliases)
 138                 return;
 139
 140         tx39_blast_dcache();
 141 }
 142
 143 static inline void tx39___flush_cache_all(void)
 144 {
 145         tx39_blast_dcache();
 146         tx39_blast_icache();
 147 }
 148
 149 static void tx39_flush_cache_mm(struct mm_struct *mm)
 150 {
 151         if (!cpu_has_dc_aliases)
 152                 return;
 153
 154         if (cpu_context(smp_processor_id(), mm) != 0)
 155                 tx39_blast_dcache();
 156 }
 157
 158 static void tx39_flush_cache_range(struct vm_area_struct *vma,
 159         unsigned long start, unsigned long end)
 160 {
 161         if (!cpu_has_dc_aliases)
 162                 return;
 163         if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
 164                 return;
 165
 166         tx39_blast_dcache();
 167 }
 168
 169 static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page, unsigned long pfn)
 170 {
 171         int exec = vma->vm_flags & VM_EXEC;
 172         struct mm_struct *mm = vma->vm_mm;
 173         pgd_t *pgdp;
 174         pud_t *pudp;
 175         pmd_t *pmdp;
 176         pte_t *ptep;
 177
 178         /*
 179          * If ownes no valid ASID yet, cannot possibly have gotten
 180          * this page into the cache.
 181          */
 182         if (cpu_context(smp_processor_id(), mm) == 0)
 183                 return;
 184
 185         page &= PAGE_MASK;
 186         pgdp = pgd_offset(mm, page);
 187         pudp = pud_offset(pgdp, page);
 188         pmdp = pmd_offset(pudp, page);
 189         ptep = pte_offset(pmdp, page);
 190
 191         /*
 192          * If the page isn't marked valid, the page cannot possibly be
 193          * in the cache.
 194          */
 195         if (!(pte_val(*ptep) & _PAGE_PRESENT))
 196                 return;
 197
 198         /*
 199          * Doing flushes for another ASID than the current one is
 200          * too difficult since stupid R4k caches do a TLB translation
 201          * for every cache flush operation.  So we do indexed flushes
 202          * in that case, which doesn't overly flush the cache too much.
 203          */
 204         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
 205                 if (cpu_has_dc_aliases || exec)
 206                         tx39_blast_dcache_page(page);
 207                 if (exec)
 208                         tx39_blast_icache_page(page);
 209
 210                 return;
 211         }
 212
 213         /*
 214          * Do indexed flush, too much work to get the (possible) TLB refills
 215          * to work correctly.
 216          */
 217         if (cpu_has_dc_aliases || exec)
 218                 tx39_blast_dcache_page_indexed(page);
 219         if (exec)
 220                 tx39_blast_icache_page_indexed(page);
 221 }
 222
 223 static void local_tx39_flush_data_cache_page(void * addr)
 224 {
 225         tx39_blast_dcache_page((unsigned long)addr);
 226 }
 227
 228 static void tx39_flush_data_cache_page(unsigned long addr)
 229 {
 230         tx39_blast_dcache_page(addr);
 231 }
 232
 233 static void tx39_flush_icache_range(unsigned long start, unsigned long end)
 234 {
 235         if (end - start > dcache_size)
 236                 tx39_blast_dcache();
 237         else
 238                 protected_blast_dcache_range(start, end);
 239
 240         if (end - start > icache_size)
 241                 tx39_blast_icache();
 242         else {
 243                 unsigned long flags, config;
 244                 /* disable icache (set ICE#) */
 245                 local_irq_save(flags);
 246                 config = read_c0_conf();
 247                 write_c0_conf(config & ~TX39_CONF_ICE);
 248                 TX39_STOP_STREAMING();
 249                 protected_blast_icache_range(start, end);
 250                 write_c0_conf(config);
 251                 local_irq_restore(flags);
 252         }
 253 }
 254
 255 static void tx39_flush_kernel_vmap_range(unsigned long vaddr, int size)
 256 {
 257         BUG();
 258 }
 259
 260 static void tx39_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 261 {
 262         unsigned long end;
 263
 264         if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
 265                 end = addr + size;
 266                 do {
 267                         tx39_blast_dcache_page(addr);
 268                         addr += PAGE_SIZE;
 269                 } while(addr != end);
 270         } else if (size > dcache_size) {
 271                 tx39_blast_dcache();
 272         } else {
 273                 blast_dcache_range(addr, addr + size);
 274         }
 275 }
 276
 277 static void tx39_dma_cache_inv(unsigned long addr, unsigned long size)
 278 {
 279         unsigned long end;
 280
 281         if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
 282                 end = addr + size;
 283                 do {
 284                         tx39_blast_dcache_page(addr);
 285                         addr += PAGE_SIZE;
 286                 } while(addr != end);
 287         } else if (size > dcache_size) {
 288                 tx39_blast_dcache();
 289         } else {
 290                 blast_inv_dcache_range(addr, addr + size);
 291         }
 292 }
 293
 294 static void tx39_flush_cache_sigtramp(unsigned long addr)
 295 {
 296         unsigned long ic_lsize = current_cpu_data.icache.linesz;
 297         unsigned long dc_lsize = current_cpu_data.dcache.linesz;
 298         unsigned long config;
 299         unsigned long flags;
 300
 301         protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 302
 303         /* disable icache (set ICE#) */
 304         local_irq_save(flags);
 305         config = read_c0_conf();
 306         write_c0_conf(config & ~TX39_CONF_ICE);
 307         TX39_STOP_STREAMING();
 308         protected_flush_icache_line(addr & ~(ic_lsize - 1));
 309         write_c0_conf(config);
 310         local_irq_restore(flags);
 311 }
 312
 313 static __init void tx39_probe_cache(void)
 314 {
 315         unsigned long config;
 316
 317         config = read_c0_conf();
 318
 319         icache_size = 1 << (10 + ((config & TX39_CONF_ICS_MASK) >>
 320                                   TX39_CONF_ICS_SHIFT));
 321         dcache_size = 1 << (10 + ((config & TX39_CONF_DCS_MASK) >>
 322                                   TX39_CONF_DCS_SHIFT));
 323
 324         current_cpu_data.icache.linesz = 16;
 325         switch (current_cpu_type()) {
 326         case CPU_TX3912:
 327                 current_cpu_data.icache.ways = 1;
 328                 current_cpu_data.dcache.ways = 1;
 329                 current_cpu_data.dcache.linesz = 4;
 330                 break;
 331
 332         case CPU_TX3927:
 333                 current_cpu_data.icache.ways = 2;
 334                 current_cpu_data.dcache.ways = 2;
 335                 current_cpu_data.dcache.linesz = 16;
 336                 break;
 337
 338         case CPU_TX3922:
 339         default:
 340                 current_cpu_data.icache.ways = 1;
 341                 current_cpu_data.dcache.ways = 1;
 342                 current_cpu_data.dcache.linesz = 16;
 343                 break;
 344         }
 345 }
 346
 347 void tx39_cache_init(void)
 348 {
 349         extern void build_clear_page(void);
 350         extern void build_copy_page(void);
 351         unsigned long config;
 352
 353         config = read_c0_conf();
 354         config &= ~TX39_CONF_WBON;
 355         write_c0_conf(config);
 356
 357         tx39_probe_cache();
 358
 359         switch (current_cpu_type()) {
 360         case CPU_TX3912:
 361                 /* TX39/H core (writethru direct-map cache) */
 362                 __flush_cache_vmap      = tx39__flush_cache_vmap;
 363                 __flush_cache_vunmap    = tx39__flush_cache_vunmap;
 364                 flush_cache_all = tx39h_flush_icache_all;
 365                 __flush_cache_all       = tx39h_flush_icache_all;
 366                 flush_cache_mm          = (void *) tx39h_flush_icache_all;
 367                 flush_cache_range       = (void *) tx39h_flush_icache_all;
 368                 flush_cache_page        = (void *) tx39h_flush_icache_all;
 369                 flush_icache_range      = (void *) tx39h_flush_icache_all;
 370                 local_flush_icache_range = (void *) tx39h_flush_icache_all;
 371
 372                 flush_cache_sigtramp    = (void *) tx39h_flush_icache_all;
 373                 local_flush_data_cache_page     = (void *) tx39h_flush_icache_all;
 374                 flush_data_cache_page   = (void *) tx39h_flush_icache_all;
 375
 376                 _dma_cache_wback_inv    = tx39h_dma_cache_wback_inv;
 377
 378                 shm_align_mask          = PAGE_SIZE - 1;
 379
 380                 break;
 381
 382         case CPU_TX3922:
 383         case CPU_TX3927:
 384         default:
 385                 /* TX39/H2,H3 core (writeback 2way-set-associative cache) */
 386                 r3k_have_wired_reg = 1;
 387                 write_c0_wired(0);      /* set 8 on reset... */
 388                 /* board-dependent init code may set WBON */
 389
 390                 __flush_cache_vmap      = tx39__flush_cache_vmap;
 391                 __flush_cache_vunmap    = tx39__flush_cache_vunmap;
 392
 393                 flush_cache_all = tx39_flush_cache_all;
 394                 __flush_cache_all = tx39___flush_cache_all;
 395                 flush_cache_mm = tx39_flush_cache_mm;
 396                 flush_cache_range = tx39_flush_cache_range;
 397                 flush_cache_page = tx39_flush_cache_page;
 398                 flush_icache_range = tx39_flush_icache_range;
 399                 local_flush_icache_range = tx39_flush_icache_range;
 400
 401                 __flush_kernel_vmap_range = tx39_flush_kernel_vmap_range;
 402
 403                 flush_cache_sigtramp = tx39_flush_cache_sigtramp;
 404                 local_flush_data_cache_page = local_tx39_flush_data_cache_page;
 405                 flush_data_cache_page = tx39_flush_data_cache_page;
 406
 407                 _dma_cache_wback_inv = tx39_dma_cache_wback_inv;
 408                 _dma_cache_wback = tx39_dma_cache_wback_inv;
 409                 _dma_cache_inv = tx39_dma_cache_inv;
 410
 411                 shm_align_mask = max_t(unsigned long,
 412                                        (dcache_size / current_cpu_data.dcache.ways) - 1,
 413                                        PAGE_SIZE - 1);
 414
 415                 break;
 416         }
 417
 418         current_cpu_data.icache.waysize = icache_size / current_cpu_data.icache.ways;
 419         current_cpu_data.dcache.waysize = dcache_size / current_cpu_data.dcache.ways;
 420
 421         current_cpu_data.icache.sets =
 422                 current_cpu_data.icache.waysize / current_cpu_data.icache.linesz;
 423         current_cpu_data.dcache.sets =
 424                 current_cpu_data.dcache.waysize / current_cpu_data.dcache.linesz;
 425
 426         if (current_cpu_data.dcache.waysize > PAGE_SIZE)
 427                 current_cpu_data.dcache.flags |= MIPS_CACHE_ALIASES;
 428
 429         current_cpu_data.icache.waybit = 0;
 430         current_cpu_data.dcache.waybit = 0;
 431
 432         printk("Primary instruction cache %ldkB, linesize %d bytes\n",
 433                 icache_size >> 10, current_cpu_data.icache.linesz);
 434         printk("Primary data cache %ldkB, linesize %d bytes\n",
 435                 dcache_size >> 10, current_cpu_data.dcache.linesz);
 436
 437         build_clear_page();
 438         build_copy_page();
 439         tx39h_flush_icache_all();
 440 }