drivers/staging/tidspbridge/hw/hw_mmu.c

   1 /*
   2  * hw_mmu.c
   3  *
   4  * DSP-BIOS Bridge driver support functions for TI OMAP processors.
   5  *
   6  * API definitions to setup MMU TLB and PTE
   7  *
   8  * Copyright (C) 2007 Texas Instruments, Inc.
   9  *
  10  * This package is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  16  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  17  */
  18
  19 #include <linux/io.h>
  20 #include "MMURegAcM.h"
  21 #include <hw_defs.h>
  22 #include <hw_mmu.h>
  23 #include <linux/types.h>
  24 #include <linux/err.h>
  25
  26 #define MMU_BASE_VAL_MASK       0xFC00
  27 #define MMU_PAGE_MAX         3
  28 #define MMU_ELEMENTSIZE_MAX      3
  29 #define MMU_ADDR_MASK       0xFFFFF000
  30 #define MMU_TTB_MASK         0xFFFFC000
  31 #define MMU_SECTION_ADDR_MASK    0xFFF00000
  32 #define MMU_SSECTION_ADDR_MASK   0xFF000000
  33 #define MMU_PAGE_TABLE_MASK      0xFFFFFC00
  34 #define MMU_LARGE_PAGE_MASK      0xFFFF0000
  35 #define MMU_SMALL_PAGE_MASK      0xFFFFF000
  36
  37 #define MMU_LOAD_TLB    0x00000001
  38 #define MMU_GFLUSH      0x60
  39
  40 /*
  41  * hw_mmu_page_size_t: Enumerated Type used to specify the MMU Page Size(SLSS)
  42  */
  43 enum hw_mmu_page_size_t {
  44         HW_MMU_SECTION,
  45         HW_MMU_LARGE_PAGE,
  46         HW_MMU_SMALL_PAGE,
  47         HW_MMU_SUPERSECTION
  48 };
  49
  50 /*
  51  * FUNCTION           : mmu_flush_entry
  52  *
  53  * INPUTS:
  54  *
  55  *       Identifier      : base_address
  56  *       Type           : const u32
  57  *       Description     : Base Address of instance of MMU module
  58  *
  59  * RETURNS:
  60  *
  61  *       Type           : hw_status
  62  *       Description     : 0             -- No errors occurred
  63  *                       RET_BAD_NULL_PARAM     -- A Pointer
  64  *                                              Paramater was set to NULL
  65  *
  66  * PURPOSE:           : Flush the TLB entry pointed by the
  67  *                      lock counter register
  68  *                      even if this entry is set protected
  69  *
  70  * METHOD:             : Check the Input parameter and Flush a
  71  *                       single entry in the TLB.
  72  */
  73 static hw_status mmu_flush_entry(const void __iomem *base_address);
  74
  75 /*
  76  * FUNCTION           : mmu_set_cam_entry
  77  *
  78  * INPUTS:
  79  *
  80  *       Identifier      : base_address
  81  *       TypE           : const u32
  82  *       Description     : Base Address of instance of MMU module
  83  *
  84  *       Identifier      : page_sz
  85  *       TypE           : const u32
  86  *       Description     : It indicates the page size
  87  *
  88  *       Identifier      : preserved_bit
  89  *       Type           : const u32
  90  *       Description     : It indicates the TLB entry is preserved entry
  91  *                                                      or not
  92  *
  93  *       Identifier      : valid_bit
  94  *       Type           : const u32
  95  *       Description     : It indicates the TLB entry is valid entry or not
  96  *
  97  *
  98  *       Identifier      : virtual_addr_tag
  99  *       Type           : const u32
 100  *       Description     : virtual Address
 101  *
 102  * RETURNS:
 103  *
 104  *       Type           : hw_status
 105  *       Description     : 0             -- No errors occurred
 106  *                       RET_BAD_NULL_PARAM     -- A Pointer Paramater
 107  *                                                 was set to NULL
 108  *                       RET_PARAM_OUT_OF_RANGE -- Input Parameter out
 109  *                                                 of Range
 110  *
 111  * PURPOSE:             : Set MMU_CAM reg
 112  *
 113  * METHOD:              : Check the Input parameters and set the CAM entry.
 114  */
 115 static hw_status mmu_set_cam_entry(const void __iomem *base_address,
 116                                    const u32 page_sz,
 117                                    const u32 preserved_bit,
 118                                    const u32 valid_bit,
 119                                    const u32 virtual_addr_tag);
 120
 121 /*
 122  * FUNCTION           : mmu_set_ram_entry
 123  *
 124  * INPUTS:
 125  *
 126  *       Identifier      : base_address
 127  *       Type           : const u32
 128  *       Description     : Base Address of instance of MMU module
 129  *
 130  *       Identifier      : physical_addr
 131  *       Type           : const u32
 132  *       Description     : Physical Address to which the corresponding
 133  *                       virtual   Address shouldpoint
 134  *
 135  *       Identifier      : endianism
 136  *       Type           : hw_endianism_t
 137  *       Description     : endianism for the given page
 138  *
 139  *       Identifier      : element_size
 140  *       Type           : hw_element_size_t
 141  *       Description     : The element size ( 8,16, 32 or 64 bit)
 142  *
 143  *       Identifier      : mixed_size
 144  *       Type           : hw_mmu_mixed_size_t
 145  *       Description     : Element Size to follow CPU or TLB
 146  *
 147  * RETURNS:
 148  *
 149  *       Type           : hw_status
 150  *       Description     : 0             -- No errors occurred
 151  *                       RET_BAD_NULL_PARAM     -- A Pointer Paramater
 152  *                                                      was set to NULL
 153  *                       RET_PARAM_OUT_OF_RANGE -- Input Parameter
 154  *                                                      out of Range
 155  *
 156  * PURPOSE:           : Set MMU_CAM reg
 157  *
 158  * METHOD:             : Check the Input parameters and set the RAM entry.
 159  */
 160 static hw_status mmu_set_ram_entry(const void __iomem *base_address,
 161                                    const u32 physical_addr,
 162                                    enum hw_endianism_t endianism,
 163                                    enum hw_element_size_t element_size,
 164                                    enum hw_mmu_mixed_size_t mixed_size);
 165
 166 /* HW FUNCTIONS */
 167
 168 hw_status hw_mmu_enable(const void __iomem *base_address)
 169 {
 170         hw_status status = 0;
 171
 172         MMUMMU_CNTLMMU_ENABLE_WRITE32(base_address, HW_SET);
 173
 174         return status;
 175 }
 176
 177 hw_status hw_mmu_disable(const void __iomem *base_address)
 178 {
 179         hw_status status = 0;
 180
 181         MMUMMU_CNTLMMU_ENABLE_WRITE32(base_address, HW_CLEAR);
 182
 183         return status;
 184 }
 185
 186 hw_status hw_mmu_num_locked_set(const void __iomem *base_address,
 187                                 u32 num_locked_entries)
 188 {
 189         hw_status status = 0;
 190
 191         MMUMMU_LOCK_BASE_VALUE_WRITE32(base_address, num_locked_entries);
 192
 193         return status;
 194 }
 195
 196 hw_status hw_mmu_victim_num_set(const void __iomem *base_address,
 197                                 u32 victim_entry_num)
 198 {
 199         hw_status status = 0;
 200
 201         MMUMMU_LOCK_CURRENT_VICTIM_WRITE32(base_address, victim_entry_num);
 202
 203         return status;
 204 }
 205
 206 hw_status hw_mmu_event_ack(const void __iomem *base_address, u32 irq_mask)
 207 {
 208         hw_status status = 0;
 209
 210         MMUMMU_IRQSTATUS_WRITE_REGISTER32(base_address, irq_mask);
 211
 212         return status;
 213 }
 214
 215 hw_status hw_mmu_event_disable(const void __iomem *base_address, u32 irq_mask)
 216 {
 217         hw_status status = 0;
 218         u32 irq_reg;
 219
 220         irq_reg = MMUMMU_IRQENABLE_READ_REGISTER32(base_address);
 221
 222         MMUMMU_IRQENABLE_WRITE_REGISTER32(base_address, irq_reg & ~irq_mask);
 223
 224         return status;
 225 }
 226
 227 hw_status hw_mmu_event_enable(const void __iomem *base_address, u32 irq_mask)
 228 {
 229         hw_status status = 0;
 230         u32 irq_reg;
 231
 232         irq_reg = MMUMMU_IRQENABLE_READ_REGISTER32(base_address);
 233
 234         MMUMMU_IRQENABLE_WRITE_REGISTER32(base_address, irq_reg | irq_mask);
 235
 236         return status;
 237 }
 238
 239 hw_status hw_mmu_event_status(const void __iomem *base_address, u32 *irq_mask)
 240 {
 241         hw_status status = 0;
 242
 243         *irq_mask = MMUMMU_IRQSTATUS_READ_REGISTER32(base_address);
 244
 245         return status;
 246 }
 247
 248 hw_status hw_mmu_fault_addr_read(const void __iomem *base_address, u32 *addr)
 249 {
 250         hw_status status = 0;
 251
 252         /* read values from register */
 253         *addr = MMUMMU_FAULT_AD_READ_REGISTER32(base_address);
 254
 255         return status;
 256 }
 257
 258 hw_status hw_mmu_ttb_set(const void __iomem *base_address, u32 ttb_phys_addr)
 259 {
 260         hw_status status = 0;
 261         u32 load_ttb;
 262
 263         load_ttb = ttb_phys_addr & ~0x7FUL;
 264         /* write values to register */
 265         MMUMMU_TTB_WRITE_REGISTER32(base_address, load_ttb);
 266
 267         return status;
 268 }
 269
 270 hw_status hw_mmu_twl_enable(const void __iomem *base_address)
 271 {
 272         hw_status status = 0;
 273
 274         MMUMMU_CNTLTWL_ENABLE_WRITE32(base_address, HW_SET);
 275
 276         return status;
 277 }
 278
 279 hw_status hw_mmu_twl_disable(const void __iomem *base_address)
 280 {
 281         hw_status status = 0;
 282
 283         MMUMMU_CNTLTWL_ENABLE_WRITE32(base_address, HW_CLEAR);
 284
 285         return status;
 286 }
 287
 288 hw_status hw_mmu_tlb_flush(const void __iomem *base_address, u32 virtual_addr,
 289                            u32 page_sz)
 290 {
 291         hw_status status = 0;
 292         u32 virtual_addr_tag;
 293         enum hw_mmu_page_size_t pg_size_bits;
 294
 295         switch (page_sz) {
 296         case HW_PAGE_SIZE4KB:
 297                 pg_size_bits = HW_MMU_SMALL_PAGE;
 298                 break;
 299
 300         case HW_PAGE_SIZE64KB:
 301                 pg_size_bits = HW_MMU_LARGE_PAGE;
 302                 break;
 303
 304         case HW_PAGE_SIZE1MB:
 305                 pg_size_bits = HW_MMU_SECTION;
 306                 break;
 307
 308         case HW_PAGE_SIZE16MB:
 309                 pg_size_bits = HW_MMU_SUPERSECTION;
 310                 break;
 311
 312         default:
 313                 return -EINVAL;
 314         }
 315
 316         /* Generate the 20-bit tag from virtual address */
 317         virtual_addr_tag = ((virtual_addr & MMU_ADDR_MASK) >> 12);
 318
 319         mmu_set_cam_entry(base_address, pg_size_bits, 0, 0, virtual_addr_tag);
 320
 321         mmu_flush_entry(base_address);
 322
 323         return status;
 324 }
 325
 326 hw_status hw_mmu_tlb_add(const void __iomem *base_address,
 327                          u32 physical_addr,
 328                          u32 virtual_addr,
 329                          u32 page_sz,
 330                          u32 entry_num,
 331                          struct hw_mmu_map_attrs_t *map_attrs,
 332                          s8 preserved_bit, s8 valid_bit)
 333 {
 334         hw_status status = 0;
 335         u32 lock_reg;
 336         u32 virtual_addr_tag;
 337         enum hw_mmu_page_size_t mmu_pg_size;
 338
 339         /*Check the input Parameters */
 340         switch (page_sz) {
 341         case HW_PAGE_SIZE4KB:
 342                 mmu_pg_size = HW_MMU_SMALL_PAGE;
 343                 break;
 344
 345         case HW_PAGE_SIZE64KB:
 346                 mmu_pg_size = HW_MMU_LARGE_PAGE;
 347                 break;
 348
 349         case HW_PAGE_SIZE1MB:
 350                 mmu_pg_size = HW_MMU_SECTION;
 351                 break;
 352
 353         case HW_PAGE_SIZE16MB:
 354                 mmu_pg_size = HW_MMU_SUPERSECTION;
 355                 break;
 356
 357         default:
 358                 return -EINVAL;
 359         }
 360
 361         lock_reg = MMUMMU_LOCK_READ_REGISTER32(base_address);
 362
 363         /* Generate the 20-bit tag from virtual address */
 364         virtual_addr_tag = ((virtual_addr & MMU_ADDR_MASK) >> 12);
 365
 366         /* Write the fields in the CAM Entry Register */
 367         mmu_set_cam_entry(base_address, mmu_pg_size, preserved_bit, valid_bit,
 368                           virtual_addr_tag);
 369
 370         /* Write the different fields of the RAM Entry Register */
 371         /* endianism of the page,Element Size of the page (8, 16, 32, 64 bit) */
 372         mmu_set_ram_entry(base_address, physical_addr, map_attrs->endianism,
 373                           map_attrs->element_size, map_attrs->mixed_size);
 374
 375         /* Update the MMU Lock Register */
 376         /* currentVictim between lockedBaseValue and (MMU_Entries_Number - 1) */
 377         MMUMMU_LOCK_CURRENT_VICTIM_WRITE32(base_address, entry_num);
 378
 379         /* Enable loading of an entry in TLB by writing 1
 380            into LD_TLB_REG register */
 381         MMUMMU_LD_TLB_WRITE_REGISTER32(base_address, MMU_LOAD_TLB);
 382
 383         MMUMMU_LOCK_WRITE_REGISTER32(base_address, lock_reg);
 384
 385         return status;
 386 }
 387
 388 hw_status hw_mmu_pte_set(const u32 pg_tbl_va,
 389                          u32 physical_addr,
 390                          u32 virtual_addr,
 391                          u32 page_sz, struct hw_mmu_map_attrs_t *map_attrs)
 392 {
 393         hw_status status = 0;
 394         u32 pte_addr, pte_val;
 395         s32 num_entries = 1;
 396
 397         switch (page_sz) {
 398         case HW_PAGE_SIZE4KB:
 399                 pte_addr = hw_mmu_pte_addr_l2(pg_tbl_va,
 400                                               virtual_addr &
 401                                               MMU_SMALL_PAGE_MASK);
 402                 pte_val =
 403                     ((physical_addr & MMU_SMALL_PAGE_MASK) |
 404                      (map_attrs->endianism << 9) | (map_attrs->
 405                                                     element_size << 4) |
 406                      (map_attrs->mixed_size << 11) | 2);
 407                 break;
 408
 409         case HW_PAGE_SIZE64KB:
 410                 num_entries = 16;
 411                 pte_addr = hw_mmu_pte_addr_l2(pg_tbl_va,
 412                                               virtual_addr &
 413                                               MMU_LARGE_PAGE_MASK);
 414                 pte_val =
 415                     ((physical_addr & MMU_LARGE_PAGE_MASK) |
 416                      (map_attrs->endianism << 9) | (map_attrs->
 417                                                     element_size << 4) |
 418                      (map_attrs->mixed_size << 11) | 1);
 419                 break;
 420
 421         case HW_PAGE_SIZE1MB:
 422                 pte_addr = hw_mmu_pte_addr_l1(pg_tbl_va,
 423                                               virtual_addr &
 424                                               MMU_SECTION_ADDR_MASK);
 425                 pte_val =
 426                     ((((physical_addr & MMU_SECTION_ADDR_MASK) |
 427                        (map_attrs->endianism << 15) | (map_attrs->
 428                                                        element_size << 10) |
 429                        (map_attrs->mixed_size << 17)) & ~0x40000) | 0x2);
 430                 break;
 431
 432         case HW_PAGE_SIZE16MB:
 433                 num_entries = 16;
 434                 pte_addr = hw_mmu_pte_addr_l1(pg_tbl_va,
 435                                               virtual_addr &
 436                                               MMU_SSECTION_ADDR_MASK);
 437                 pte_val =
 438                     (((physical_addr & MMU_SSECTION_ADDR_MASK) |
 439                       (map_attrs->endianism << 15) | (map_attrs->
 440                                                       element_size << 10) |
 441                       (map_attrs->mixed_size << 17)
 442                      ) | 0x40000 | 0x2);
 443                 break;
 444
 445         case HW_MMU_COARSE_PAGE_SIZE:
 446                 pte_addr = hw_mmu_pte_addr_l1(pg_tbl_va,
 447                                               virtual_addr &
 448                                               MMU_SECTION_ADDR_MASK);
 449                 pte_val = (physical_addr & MMU_PAGE_TABLE_MASK) | 1;
 450                 break;
 451
 452         default:
 453                 return -EINVAL;
 454         }
 455
 456         while (--num_entries >= 0)
 457                 ((u32 *) pte_addr)[num_entries] = pte_val;
 458
 459         return status;
 460 }
 461
 462 hw_status hw_mmu_pte_clear(const u32 pg_tbl_va, u32 virtual_addr, u32 page_size)
 463 {
 464         hw_status status = 0;
 465         u32 pte_addr;
 466         s32 num_entries = 1;
 467
 468         switch (page_size) {
 469         case HW_PAGE_SIZE4KB:
 470                 pte_addr = hw_mmu_pte_addr_l2(pg_tbl_va,
 471                                               virtual_addr &
 472                                               MMU_SMALL_PAGE_MASK);
 473                 break;
 474
 475         case HW_PAGE_SIZE64KB:
 476                 num_entries = 16;
 477                 pte_addr = hw_mmu_pte_addr_l2(pg_tbl_va,
 478                                               virtual_addr &
 479                                               MMU_LARGE_PAGE_MASK);
 480                 break;
 481
 482         case HW_PAGE_SIZE1MB:
 483         case HW_MMU_COARSE_PAGE_SIZE:
 484                 pte_addr = hw_mmu_pte_addr_l1(pg_tbl_va,
 485                                               virtual_addr &
 486                                               MMU_SECTION_ADDR_MASK);
 487                 break;
 488
 489         case HW_PAGE_SIZE16MB:
 490                 num_entries = 16;
 491                 pte_addr = hw_mmu_pte_addr_l1(pg_tbl_va,
 492                                               virtual_addr &
 493                                               MMU_SSECTION_ADDR_MASK);
 494                 break;
 495
 496         default:
 497                 return -EINVAL;
 498         }
 499
 500         while (--num_entries >= 0)
 501                 ((u32 *) pte_addr)[num_entries] = 0;
 502
 503         return status;
 504 }
 505
 506 /* mmu_flush_entry */
 507 static hw_status mmu_flush_entry(const void __iomem *base_address)
 508 {
 509         hw_status status = 0;
 510         u32 flush_entry_data = 0x1;
 511
 512         /* write values to register */
 513         MMUMMU_FLUSH_ENTRY_WRITE_REGISTER32(base_address, flush_entry_data);
 514
 515         return status;
 516 }
 517
 518 /* mmu_set_cam_entry */
 519 static hw_status mmu_set_cam_entry(const void __iomem *base_address,
 520                                    const u32 page_sz,
 521                                    const u32 preserved_bit,
 522                                    const u32 valid_bit,
 523                                    const u32 virtual_addr_tag)
 524 {
 525         hw_status status = 0;
 526         u32 mmu_cam_reg;
 527
 528         mmu_cam_reg = (virtual_addr_tag << 12);
 529         mmu_cam_reg = (mmu_cam_reg) | (page_sz) | (valid_bit << 2) |
 530             (preserved_bit << 3);
 531
 532         /* write values to register */
 533         MMUMMU_CAM_WRITE_REGISTER32(base_address, mmu_cam_reg);
 534
 535         return status;
 536 }
 537
 538 /* mmu_set_ram_entry */
 539 static hw_status mmu_set_ram_entry(const void __iomem *base_address,
 540                                    const u32 physical_addr,
 541                                    enum hw_endianism_t endianism,
 542                                    enum hw_element_size_t element_size,
 543                                    enum hw_mmu_mixed_size_t mixed_size)
 544 {
 545         hw_status status = 0;
 546         u32 mmu_ram_reg;
 547
 548         mmu_ram_reg = (physical_addr & MMU_ADDR_MASK);
 549         mmu_ram_reg = (mmu_ram_reg) | ((endianism << 9) | (element_size << 7) |
 550                                        (mixed_size << 6));
 551
 552         /* write values to register */
 553         MMUMMU_RAM_WRITE_REGISTER32(base_address, mmu_ram_reg);
 554
 555         return status;
 556
 557 }
 558
 559 void hw_mmu_tlb_flush_all(const void __iomem *base)
 560 {
 561         __raw_writeb(1, base + MMU_GFLUSH);
 562 }