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