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_data.cputype != 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 inline void tx39_flush_cache_all(void)
 126 {
 127         if (!cpu_has_dc_aliases)
 128                 return;
 129
 130         tx39_blast_dcache();
 131         tx39_blast_icache();
 132 }
 133
 134 static inline void tx39___flush_cache_all(void)
 135 {
 136         tx39_blast_dcache();
 137         tx39_blast_icache();
 138 }
 139
 140 static void tx39_flush_cache_mm(struct mm_struct *mm)
 141 {
 142         if (!cpu_has_dc_aliases)
 143                 return;
 144
 145         if (cpu_context(smp_processor_id(), mm) != 0) {
 146                 tx39_flush_cache_all();
 147         }
 148 }
 149
 150 static void tx39_flush_cache_range(struct vm_area_struct *vma,
 151         unsigned long start, unsigned long end)
 152 {
 153         int exec;
 154
 155         if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
 156                 return;
 157
 158         exec = vma->vm_flags & VM_EXEC;
 159         if (cpu_has_dc_aliases || exec)
 160                 tx39_blast_dcache();
 161         if (exec)
 162                 tx39_blast_icache();
 163 }
 164
 165 static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page, unsigned long pfn)
 166 {
 167         int exec = vma->vm_flags & VM_EXEC;
 168         struct mm_struct *mm = vma->vm_mm;
 169         pgd_t *pgdp;
 170         pud_t *pudp;
 171         pmd_t *pmdp;
 172         pte_t *ptep;
 173
 174         /*
 175          * If ownes no valid ASID yet, cannot possibly have gotten
 176          * this page into the cache.
 177          */
 178         if (cpu_context(smp_processor_id(), mm) == 0)
 179                 return;
 180
 181         page &= PAGE_MASK;
 182         pgdp = pgd_offset(mm, page);
 183         pudp = pud_offset(pgdp, page);
 184         pmdp = pmd_offset(pudp, page);
 185         ptep = pte_offset(pmdp, page);
 186
 187         /*
 188          * If the page isn't marked valid, the page cannot possibly be
 189          * in the cache.
 190          */
 191         if (!(pte_val(*ptep) & _PAGE_PRESENT))
 192                 return;
 193
 194         /*
 195          * Doing flushes for another ASID than the current one is
 196          * too difficult since stupid R4k caches do a TLB translation
 197          * for every cache flush operation.  So we do indexed flushes
 198          * in that case, which doesn't overly flush the cache too much.
 199          */
 200         if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
 201                 if (cpu_has_dc_aliases || exec)
 202                         tx39_blast_dcache_page(page);
 203                 if (exec)
 204                         tx39_blast_icache_page(page);
 205
 206                 return;
 207         }
 208
 209         /*
 210          * Do indexed flush, too much work to get the (possible) TLB refills
 211          * to work correctly.
 212          */
 213         if (cpu_has_dc_aliases || exec)
 214                 tx39_blast_dcache_page_indexed(page);
 215         if (exec)
 216                 tx39_blast_icache_page_indexed(page);
 217 }
 218
 219 static void tx39_flush_data_cache_page(unsigned long addr)
 220 {
 221         tx39_blast_dcache_page(addr);
 222 }
 223
 224 static void tx39_flush_icache_range(unsigned long start, unsigned long end)
 225 {
 226         if (end - start > dcache_size)
 227                 tx39_blast_dcache();
 228         else
 229                 protected_blast_dcache_range(start, end);
 230
 231         if (end - start > icache_size)
 232                 tx39_blast_icache();
 233         else {
 234                 unsigned long flags, config;
 235                 /* disable icache (set ICE#) */
 236                 local_irq_save(flags);
 237                 config = read_c0_conf();
 238                 write_c0_conf(config & ~TX39_CONF_ICE);
 239                 TX39_STOP_STREAMING();
 240                 protected_blast_icache_range(start, end);
 241                 write_c0_conf(config);
 242                 local_irq_restore(flags);
 243         }
 244 }
 245
 246 /*
 247  * Ok, this seriously sucks.  We use them to flush a user page but don't
 248  * know the virtual address, so we have to blast away the whole icache
 249  * which is significantly more expensive than the real thing.  Otoh we at
 250  * least know the kernel address of the page so we can flush it
 251  * selectivly.
 252  */
 253 static void tx39_flush_icache_page(struct vm_area_struct *vma, struct page *page)
 254 {
 255         unsigned long addr;
 256         /*
 257          * If there's no context yet, or the page isn't executable, no icache
 258          * flush is needed.
 259          */
 260         if (!(vma->vm_flags & VM_EXEC))
 261                 return;
 262
 263         addr = (unsigned long) page_address(page);
 264         tx39_blast_dcache_page(addr);
 265
 266         /*
 267          * We're not sure of the virtual address(es) involved here, so
 268          * we have to flush the entire I-cache.
 269          */
 270         tx39_blast_icache();
 271 }
 272
 273 static void tx39_dma_cache_wback_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_dcache_range(addr, addr + size);
 287         }
 288 }
 289
 290 static void tx39_dma_cache_inv(unsigned long addr, unsigned long size)
 291 {
 292         unsigned long end;
 293
 294         if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
 295                 end = addr + size;
 296                 do {
 297                         tx39_blast_dcache_page(addr);
 298                         addr += PAGE_SIZE;
 299                 } while(addr != end);
 300         } else if (size > dcache_size) {
 301                 tx39_blast_dcache();
 302         } else {
 303                 blast_inv_dcache_range(addr, addr + size);
 304         }
 305 }
 306
 307 static void tx39_flush_cache_sigtramp(unsigned long addr)
 308 {
 309         unsigned long ic_lsize = current_cpu_data.icache.linesz;
 310         unsigned long dc_lsize = current_cpu_data.dcache.linesz;
 311         unsigned long config;
 312         unsigned long flags;
 313
 314         protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
 315
 316         /* disable icache (set ICE#) */
 317         local_irq_save(flags);
 318         config = read_c0_conf();
 319         write_c0_conf(config & ~TX39_CONF_ICE);
 320         TX39_STOP_STREAMING();
 321         protected_flush_icache_line(addr & ~(ic_lsize - 1));
 322         write_c0_conf(config);
 323         local_irq_restore(flags);
 324 }
 325
 326 static __init void tx39_probe_cache(void)
 327 {
 328         unsigned long config;
 329
 330         config = read_c0_conf();
 331
 332         icache_size = 1 << (10 + ((config & TX39_CONF_ICS_MASK) >>
 333                                   TX39_CONF_ICS_SHIFT));
 334         dcache_size = 1 << (10 + ((config & TX39_CONF_DCS_MASK) >>
 335                                   TX39_CONF_DCS_SHIFT));
 336
 337         current_cpu_data.icache.linesz = 16;
 338         switch (current_cpu_data.cputype) {
 339         case CPU_TX3912:
 340                 current_cpu_data.icache.ways = 1;
 341                 current_cpu_data.dcache.ways = 1;
 342                 current_cpu_data.dcache.linesz = 4;
 343                 break;
 344
 345         case CPU_TX3927:
 346                 current_cpu_data.icache.ways = 2;
 347                 current_cpu_data.dcache.ways = 2;
 348                 current_cpu_data.dcache.linesz = 16;
 349                 break;
 350
 351         case CPU_TX3922:
 352         default:
 353                 current_cpu_data.icache.ways = 1;
 354                 current_cpu_data.dcache.ways = 1;
 355                 current_cpu_data.dcache.linesz = 16;
 356                 break;
 357         }
 358 }
 359
 360 void __init tx39_cache_init(void)
 361 {
 362         extern void build_clear_page(void);
 363         extern void build_copy_page(void);
 364         unsigned long config;
 365
 366         config = read_c0_conf();
 367         config &= ~TX39_CONF_WBON;
 368         write_c0_conf(config);
 369
 370         tx39_probe_cache();
 371
 372         switch (current_cpu_data.cputype) {
 373         case CPU_TX3912:
 374                 /* TX39/H core (writethru direct-map cache) */
 375                 flush_cache_all = tx39h_flush_icache_all;
 376                 __flush_cache_all       = tx39h_flush_icache_all;
 377                 flush_cache_mm          = (void *) tx39h_flush_icache_all;
 378                 flush_cache_range       = (void *) tx39h_flush_icache_all;
 379                 flush_cache_page        = (void *) tx39h_flush_icache_all;
 380                 flush_icache_page       = (void *) tx39h_flush_icache_all;
 381                 flush_icache_range      = (void *) tx39h_flush_icache_all;
 382
 383                 flush_cache_sigtramp    = (void *) tx39h_flush_icache_all;
 384                 flush_data_cache_page   = (void *) tx39h_flush_icache_all;
 385
 386                 _dma_cache_wback_inv    = tx39h_dma_cache_wback_inv;
 387
 388                 shm_align_mask          = PAGE_SIZE - 1;
 389
 390                 break;
 391
 392         case CPU_TX3922:
 393         case CPU_TX3927:
 394         default:
 395                 /* TX39/H2,H3 core (writeback 2way-set-associative cache) */
 396                 r3k_have_wired_reg = 1;
 397                 write_c0_wired(0);      /* set 8 on reset... */
 398                 /* board-dependent init code may set WBON */
 399
 400                 flush_cache_all = tx39_flush_cache_all;
 401                 __flush_cache_all = tx39___flush_cache_all;
 402                 flush_cache_mm = tx39_flush_cache_mm;
 403                 flush_cache_range = tx39_flush_cache_range;
 404                 flush_cache_page = tx39_flush_cache_page;
 405                 flush_icache_page = tx39_flush_icache_page;
 406                 flush_icache_range = tx39_flush_icache_range;
 407
 408                 flush_cache_sigtramp = tx39_flush_cache_sigtramp;
 409                 flush_data_cache_page = tx39_flush_data_cache_page;
 410
 411                 _dma_cache_wback_inv = tx39_dma_cache_wback_inv;
 412                 _dma_cache_wback = tx39_dma_cache_wback_inv;
 413                 _dma_cache_inv = tx39_dma_cache_inv;
 414
 415                 shm_align_mask = max_t(unsigned long,
 416                                        (dcache_size / current_cpu_data.dcache.ways) - 1,
 417                                        PAGE_SIZE - 1);
 418
 419                 break;
 420         }
 421
 422         current_cpu_data.icache.waysize = icache_size / current_cpu_data.icache.ways;
 423         current_cpu_data.dcache.waysize = dcache_size / current_cpu_data.dcache.ways;
 424
 425         current_cpu_data.icache.sets =
 426                 current_cpu_data.icache.waysize / current_cpu_data.icache.linesz;
 427         current_cpu_data.dcache.sets =
 428                 current_cpu_data.dcache.waysize / current_cpu_data.dcache.linesz;
 429
 430         if (current_cpu_data.dcache.waysize > PAGE_SIZE)
 431                 current_cpu_data.dcache.flags |= MIPS_CACHE_ALIASES;
 432
 433         current_cpu_data.icache.waybit = 0;
 434         current_cpu_data.dcache.waybit = 0;
 435
 436         printk("Primary instruction cache %ldkB, linesize %d bytes\n",
 437                 icache_size >> 10, current_cpu_data.icache.linesz);
 438         printk("Primary data cache %ldkB, linesize %d bytes\n",
 439                 dcache_size >> 10, current_cpu_data.dcache.linesz);
 440
 441         build_clear_page();
 442         build_copy_page();
 443         tx39h_flush_icache_all();
 444 }