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/mm.h>
  15
  16 #include <asm/cacheops.h>
  17 #include <asm/page.h>
  18 #include <asm/pgtable.h>
  19 #include <asm/mmu_context.h>
  20 #include <asm/system.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_dma_cache_wback_inv(unsigned long addr, unsigned long size)
 256 {
 257         unsigned long end;
 258
 259         if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
 260                 end = addr + size;
 261                 do {
 262                         tx39_blast_dcache_page(addr);
 263                         addr += PAGE_SIZE;
 264                 } while(addr != end);
 265         } else if (size > dcache_size) {
 266                 tx39_blast_dcache();
 267         } else {
 268                 blast_dcache_range(addr, addr + size);
 269         }
 270 }
 271
 272 static void tx39_dma_cache_inv(unsigned long addr, unsigned long size)
 273 {
 274         unsigned long end;
 275
 276         if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
 277                 end = addr + size;
 278                 do {
 279                         tx39_blast_dcache_page(addr);
 280                         addr += PAGE_SIZE;
 281                 } while(addr != end);
 282         } else if (size > dcache_size) {
 283                 tx39_blast_dcache();
 284         } else {
 285                 blast_inv_dcache_range(addr, addr + size);
 286         }
 287 }
 288
 289 static void tx39_flush_cache_sigtramp(unsigned long addr)
 290 {
 291         unsigned long ic_lsize = current_cpu_data.icache.linesz;
 292         unsigned long dc_lsize = current_cpu_data.dcache.linesz;
 293         unsigned long config;
 294         unsigned long flags;
 295
 296         protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 297
 298         /* disable icache (set ICE#) */
 299         local_irq_save(flags);
 300         config = read_c0_conf();
 301         write_c0_conf(config & ~TX39_CONF_ICE);
 302         TX39_STOP_STREAMING();
 303         protected_flush_icache_line(addr & ~(ic_lsize - 1));
 304         write_c0_conf(config);
 305         local_irq_restore(flags);
 306 }
 307
 308 static __init void tx39_probe_cache(void)
 309 {
 310         unsigned long config;
 311
 312         config = read_c0_conf();
 313
 314         icache_size = 1 << (10 + ((config & TX39_CONF_ICS_MASK) >>
 315                                   TX39_CONF_ICS_SHIFT));
 316         dcache_size = 1 << (10 + ((config & TX39_CONF_DCS_MASK) >>
 317                                   TX39_CONF_DCS_SHIFT));
 318
 319         current_cpu_data.icache.linesz = 16;
 320         switch (current_cpu_type()) {
 321         case CPU_TX3912:
 322                 current_cpu_data.icache.ways = 1;
 323                 current_cpu_data.dcache.ways = 1;
 324                 current_cpu_data.dcache.linesz = 4;
 325                 break;
 326
 327         case CPU_TX3927:
 328                 current_cpu_data.icache.ways = 2;
 329                 current_cpu_data.dcache.ways = 2;
 330                 current_cpu_data.dcache.linesz = 16;
 331                 break;
 332
 333         case CPU_TX3922:
 334         default:
 335                 current_cpu_data.icache.ways = 1;
 336                 current_cpu_data.dcache.ways = 1;
 337                 current_cpu_data.dcache.linesz = 16;
 338                 break;
 339         }
 340 }
 341
 342 void __cpuinit tx39_cache_init(void)
 343 {
 344         extern void build_clear_page(void);
 345         extern void build_copy_page(void);
 346         unsigned long config;
 347
 348         config = read_c0_conf();
 349         config &= ~TX39_CONF_WBON;
 350         write_c0_conf(config);
 351
 352         tx39_probe_cache();
 353
 354         switch (current_cpu_type()) {
 355         case CPU_TX3912:
 356                 /* TX39/H core (writethru direct-map cache) */
 357                 __flush_cache_vmap      = tx39__flush_cache_vmap;
 358                 __flush_cache_vunmap    = tx39__flush_cache_vunmap;
 359                 flush_cache_all = tx39h_flush_icache_all;
 360                 __flush_cache_all       = tx39h_flush_icache_all;
 361                 flush_cache_mm          = (void *) tx39h_flush_icache_all;
 362                 flush_cache_range       = (void *) tx39h_flush_icache_all;
 363                 flush_cache_page        = (void *) tx39h_flush_icache_all;
 364                 flush_icache_range      = (void *) tx39h_flush_icache_all;
 365
 366                 flush_cache_sigtramp    = (void *) tx39h_flush_icache_all;
 367                 local_flush_data_cache_page     = (void *) tx39h_flush_icache_all;
 368                 flush_data_cache_page   = (void *) tx39h_flush_icache_all;
 369
 370                 _dma_cache_wback_inv    = tx39h_dma_cache_wback_inv;
 371
 372                 shm_align_mask          = PAGE_SIZE - 1;
 373
 374                 break;
 375
 376         case CPU_TX3922:
 377         case CPU_TX3927:
 378         default:
 379                 /* TX39/H2,H3 core (writeback 2way-set-associative cache) */
 380                 r3k_have_wired_reg = 1;
 381                 write_c0_wired(0);      /* set 8 on reset... */
 382                 /* board-dependent init code may set WBON */
 383
 384                 __flush_cache_vmap      = tx39__flush_cache_vmap;
 385                 __flush_cache_vunmap    = tx39__flush_cache_vunmap;
 386
 387                 flush_cache_all = tx39_flush_cache_all;
 388                 __flush_cache_all = tx39___flush_cache_all;
 389                 flush_cache_mm = tx39_flush_cache_mm;
 390                 flush_cache_range = tx39_flush_cache_range;
 391                 flush_cache_page = tx39_flush_cache_page;
 392                 flush_icache_range = tx39_flush_icache_range;
 393
 394                 flush_cache_sigtramp = tx39_flush_cache_sigtramp;
 395                 local_flush_data_cache_page = local_tx39_flush_data_cache_page;
 396                 flush_data_cache_page = tx39_flush_data_cache_page;
 397
 398                 _dma_cache_wback_inv = tx39_dma_cache_wback_inv;
 399                 _dma_cache_wback = tx39_dma_cache_wback_inv;
 400                 _dma_cache_inv = tx39_dma_cache_inv;
 401
 402                 shm_align_mask = max_t(unsigned long,
 403                                        (dcache_size / current_cpu_data.dcache.ways) - 1,
 404                                        PAGE_SIZE - 1);
 405
 406                 break;
 407         }
 408
 409         current_cpu_data.icache.waysize = icache_size / current_cpu_data.icache.ways;
 410         current_cpu_data.dcache.waysize = dcache_size / current_cpu_data.dcache.ways;
 411
 412         current_cpu_data.icache.sets =
 413                 current_cpu_data.icache.waysize / current_cpu_data.icache.linesz;
 414         current_cpu_data.dcache.sets =
 415                 current_cpu_data.dcache.waysize / current_cpu_data.dcache.linesz;
 416
 417         if (current_cpu_data.dcache.waysize > PAGE_SIZE)
 418                 current_cpu_data.dcache.flags |= MIPS_CACHE_ALIASES;
 419
 420         current_cpu_data.icache.waybit = 0;
 421         current_cpu_data.dcache.waybit = 0;
 422
 423         printk("Primary instruction cache %ldkB, linesize %d bytes\n",
 424                 icache_size >> 10, current_cpu_data.icache.linesz);
 425         printk("Primary data cache %ldkB, linesize %d bytes\n",
 426                 dcache_size >> 10, current_cpu_data.dcache.linesz);
 427
 428         build_clear_page();
 429         build_copy_page();
 430         tx39h_flush_icache_all();
 431 }