1 /* 2 * IOMMU API for SMMU in Tegra30 3 * 4 * Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 * You should have received a copy of the GNU General Public License along with 16 * this program; if not, write to the Free Software Foundation, Inc., 17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 18 */ 19 20 #define pr_fmt(fmt) "%s(): " fmt, __func__ 21 22 #include <linux/module.h> 23 #include <linux/platform_device.h> 24 #include <linux/spinlock.h> 25 #include <linux/slab.h> 26 #include <linux/vmalloc.h> 27 #include <linux/mm.h> 28 #include <linux/pagemap.h> 29 #include <linux/device.h> 30 #include <linux/sched.h> 31 #include <linux/iommu.h> 32 #include <linux/io.h> 33 #include <linux/of.h> 34 #include <linux/of_iommu.h> 35 #include <linux/debugfs.h> 36 #include <linux/seq_file.h> 37 #include <linux/tegra-ahb.h> 38 39 #include <asm/page.h> 40 #include <asm/cacheflush.h> 41 42 enum smmu_hwgrp { 43 HWGRP_AFI, 44 HWGRP_AVPC, 45 HWGRP_DC, 46 HWGRP_DCB, 47 HWGRP_EPP, 48 HWGRP_G2, 49 HWGRP_HC, 50 HWGRP_HDA, 51 HWGRP_ISP, 52 HWGRP_MPE, 53 HWGRP_NV, 54 HWGRP_NV2, 55 HWGRP_PPCS, 56 HWGRP_SATA, 57 HWGRP_VDE, 58 HWGRP_VI, 59 60 HWGRP_COUNT, 61 62 HWGRP_END = ~0, 63 }; 64 65 #define HWG_AFI (1 << HWGRP_AFI) 66 #define HWG_AVPC (1 << HWGRP_AVPC) 67 #define HWG_DC (1 << HWGRP_DC) 68 #define HWG_DCB (1 << HWGRP_DCB) 69 #define HWG_EPP (1 << HWGRP_EPP) 70 #define HWG_G2 (1 << HWGRP_G2) 71 #define HWG_HC (1 << HWGRP_HC) 72 #define HWG_HDA (1 << HWGRP_HDA) 73 #define HWG_ISP (1 << HWGRP_ISP) 74 #define HWG_MPE (1 << HWGRP_MPE) 75 #define HWG_NV (1 << HWGRP_NV) 76 #define HWG_NV2 (1 << HWGRP_NV2) 77 #define HWG_PPCS (1 << HWGRP_PPCS) 78 #define HWG_SATA (1 << HWGRP_SATA) 79 #define HWG_VDE (1 << HWGRP_VDE) 80 #define HWG_VI (1 << HWGRP_VI) 81 82 /* bitmap of the page sizes currently supported */ 83 #define SMMU_IOMMU_PGSIZES (SZ_4K) 84 85 #define SMMU_CONFIG 0x10 86 #define SMMU_CONFIG_DISABLE 0 87 #define SMMU_CONFIG_ENABLE 1 88 89 /* REVISIT: To support multiple MCs */ 90 enum { 91 _MC = 0, 92 }; 93 94 enum { 95 _TLB = 0, 96 _PTC, 97 }; 98 99 #define SMMU_CACHE_CONFIG_BASE 0x14 100 #define __SMMU_CACHE_CONFIG(mc, cache) (SMMU_CACHE_CONFIG_BASE + 4 * cache) 101 #define SMMU_CACHE_CONFIG(cache) __SMMU_CACHE_CONFIG(_MC, cache) 102 103 #define SMMU_CACHE_CONFIG_STATS_SHIFT 31 104 #define SMMU_CACHE_CONFIG_STATS_ENABLE (1 << SMMU_CACHE_CONFIG_STATS_SHIFT) 105 #define SMMU_CACHE_CONFIG_STATS_TEST_SHIFT 30 106 #define SMMU_CACHE_CONFIG_STATS_TEST (1 << SMMU_CACHE_CONFIG_STATS_TEST_SHIFT) 107 108 #define SMMU_TLB_CONFIG_HIT_UNDER_MISS__ENABLE (1 << 29) 109 #define SMMU_TLB_CONFIG_ACTIVE_LINES__VALUE 0x10 110 #define SMMU_TLB_CONFIG_RESET_VAL 0x20000010 111 112 #define SMMU_PTC_CONFIG_CACHE__ENABLE (1 << 29) 113 #define SMMU_PTC_CONFIG_INDEX_MAP__PATTERN 0x3f 114 #define SMMU_PTC_CONFIG_RESET_VAL 0x2000003f 115 116 #define SMMU_PTB_ASID 0x1c 117 #define SMMU_PTB_ASID_CURRENT_SHIFT 0 118 119 #define SMMU_PTB_DATA 0x20 120 #define SMMU_PTB_DATA_RESET_VAL 0 121 #define SMMU_PTB_DATA_ASID_NONSECURE_SHIFT 29 122 #define SMMU_PTB_DATA_ASID_WRITABLE_SHIFT 30 123 #define SMMU_PTB_DATA_ASID_READABLE_SHIFT 31 124 125 #define SMMU_TLB_FLUSH 0x30 126 #define SMMU_TLB_FLUSH_VA_MATCH_ALL 0 127 #define SMMU_TLB_FLUSH_VA_MATCH_SECTION 2 128 #define SMMU_TLB_FLUSH_VA_MATCH_GROUP 3 129 #define SMMU_TLB_FLUSH_ASID_SHIFT 29 130 #define SMMU_TLB_FLUSH_ASID_MATCH_DISABLE 0 131 #define SMMU_TLB_FLUSH_ASID_MATCH_ENABLE 1 132 #define SMMU_TLB_FLUSH_ASID_MATCH_SHIFT 31 133 134 #define SMMU_PTC_FLUSH 0x34 135 #define SMMU_PTC_FLUSH_TYPE_ALL 0 136 #define SMMU_PTC_FLUSH_TYPE_ADR 1 137 #define SMMU_PTC_FLUSH_ADR_SHIFT 4 138 139 #define SMMU_ASID_SECURITY 0x38 140 141 #define SMMU_STATS_CACHE_COUNT_BASE 0x1f0 142 143 #define SMMU_STATS_CACHE_COUNT(mc, cache, hitmiss) \ 144 (SMMU_STATS_CACHE_COUNT_BASE + 8 * cache + 4 * hitmiss) 145 146 #define SMMU_TRANSLATION_ENABLE_0 0x228 147 #define SMMU_TRANSLATION_ENABLE_1 0x22c 148 #define SMMU_TRANSLATION_ENABLE_2 0x230 149 150 #define SMMU_AFI_ASID 0x238 /* PCIE */ 151 #define SMMU_AVPC_ASID 0x23c /* AVP */ 152 #define SMMU_DC_ASID 0x240 /* Display controller */ 153 #define SMMU_DCB_ASID 0x244 /* Display controller B */ 154 #define SMMU_EPP_ASID 0x248 /* Encoder pre-processor */ 155 #define SMMU_G2_ASID 0x24c /* 2D engine */ 156 #define SMMU_HC_ASID 0x250 /* Host1x */ 157 #define SMMU_HDA_ASID 0x254 /* High-def audio */ 158 #define SMMU_ISP_ASID 0x258 /* Image signal processor */ 159 #define SMMU_MPE_ASID 0x264 /* MPEG encoder */ 160 #define SMMU_NV_ASID 0x268 /* (3D) */ 161 #define SMMU_NV2_ASID 0x26c /* (3D) */ 162 #define SMMU_PPCS_ASID 0x270 /* AHB */ 163 #define SMMU_SATA_ASID 0x278 /* SATA */ 164 #define SMMU_VDE_ASID 0x27c /* Video decoder */ 165 #define SMMU_VI_ASID 0x280 /* Video input */ 166 167 #define SMMU_PDE_NEXT_SHIFT 28 168 169 #define SMMU_TLB_FLUSH_VA_SECTION__MASK 0xffc00000 170 #define SMMU_TLB_FLUSH_VA_SECTION__SHIFT 12 /* right shift */ 171 #define SMMU_TLB_FLUSH_VA_GROUP__MASK 0xffffc000 172 #define SMMU_TLB_FLUSH_VA_GROUP__SHIFT 12 /* right shift */ 173 #define SMMU_TLB_FLUSH_VA(iova, which) \ 174 ((((iova) & SMMU_TLB_FLUSH_VA_##which##__MASK) >> \ 175 SMMU_TLB_FLUSH_VA_##which##__SHIFT) | \ 176 SMMU_TLB_FLUSH_VA_MATCH_##which) 177 #define SMMU_PTB_ASID_CUR(n) \ 178 ((n) << SMMU_PTB_ASID_CURRENT_SHIFT) 179 #define SMMU_TLB_FLUSH_ASID_MATCH_disable \ 180 (SMMU_TLB_FLUSH_ASID_MATCH_DISABLE << \ 181 SMMU_TLB_FLUSH_ASID_MATCH_SHIFT) 182 #define SMMU_TLB_FLUSH_ASID_MATCH__ENABLE \ 183 (SMMU_TLB_FLUSH_ASID_MATCH_ENABLE << \ 184 SMMU_TLB_FLUSH_ASID_MATCH_SHIFT) 185 186 #define SMMU_PAGE_SHIFT 12 187 #define SMMU_PAGE_SIZE (1 << SMMU_PAGE_SHIFT) 188 #define SMMU_PAGE_MASK ((1 << SMMU_PAGE_SHIFT) - 1) 189 190 #define SMMU_PDIR_COUNT 1024 191 #define SMMU_PDIR_SIZE (sizeof(unsigned long) * SMMU_PDIR_COUNT) 192 #define SMMU_PTBL_COUNT 1024 193 #define SMMU_PTBL_SIZE (sizeof(unsigned long) * SMMU_PTBL_COUNT) 194 #define SMMU_PDIR_SHIFT 12 195 #define SMMU_PDE_SHIFT 12 196 #define SMMU_PTE_SHIFT 12 197 #define SMMU_PFN_MASK 0x000fffff 198 199 #define SMMU_ADDR_TO_PFN(addr) ((addr) >> 12) 200 #define SMMU_ADDR_TO_PDN(addr) ((addr) >> 22) 201 #define SMMU_PDN_TO_ADDR(pdn) ((pdn) << 22) 202 203 #define _READABLE (1 << SMMU_PTB_DATA_ASID_READABLE_SHIFT) 204 #define _WRITABLE (1 << SMMU_PTB_DATA_ASID_WRITABLE_SHIFT) 205 #define _NONSECURE (1 << SMMU_PTB_DATA_ASID_NONSECURE_SHIFT) 206 #define _PDE_NEXT (1 << SMMU_PDE_NEXT_SHIFT) 207 #define _MASK_ATTR (_READABLE | _WRITABLE | _NONSECURE) 208 209 #define _PDIR_ATTR (_READABLE | _WRITABLE | _NONSECURE) 210 211 #define _PDE_ATTR (_READABLE | _WRITABLE | _NONSECURE) 212 #define _PDE_ATTR_N (_PDE_ATTR | _PDE_NEXT) 213 #define _PDE_VACANT(pdn) (((pdn) << 10) | _PDE_ATTR) 214 215 #define _PTE_ATTR (_READABLE | _WRITABLE | _NONSECURE) 216 #define _PTE_VACANT(addr) (((addr) >> SMMU_PAGE_SHIFT) | _PTE_ATTR) 217 218 #define SMMU_MK_PDIR(page, attr) \ 219 ((page_to_phys(page) >> SMMU_PDIR_SHIFT) | (attr)) 220 #define SMMU_MK_PDE(page, attr) \ 221 (unsigned long)((page_to_phys(page) >> SMMU_PDE_SHIFT) | (attr)) 222 #define SMMU_EX_PTBL_PAGE(pde) \ 223 pfn_to_page((unsigned long)(pde) & SMMU_PFN_MASK) 224 #define SMMU_PFN_TO_PTE(pfn, attr) (unsigned long)((pfn) | (attr)) 225 226 #define SMMU_ASID_ENABLE(asid) ((asid) | (1 << 31)) 227 #define SMMU_ASID_DISABLE 0 228 #define SMMU_ASID_ASID(n) ((n) & ~SMMU_ASID_ENABLE(0)) 229 230 #define NUM_SMMU_REG_BANKS 3 231 232 #define smmu_client_enable_hwgrp(c, m) smmu_client_set_hwgrp(c, m, 1) 233 #define smmu_client_disable_hwgrp(c) smmu_client_set_hwgrp(c, 0, 0) 234 #define __smmu_client_enable_hwgrp(c, m) __smmu_client_set_hwgrp(c, m, 1) 235 #define __smmu_client_disable_hwgrp(c) __smmu_client_set_hwgrp(c, 0, 0) 236 237 #define HWGRP_INIT(client) [HWGRP_##client] = SMMU_##client##_ASID 238 239 static const u32 smmu_hwgrp_asid_reg[] = { 240 HWGRP_INIT(AFI), 241 HWGRP_INIT(AVPC), 242 HWGRP_INIT(DC), 243 HWGRP_INIT(DCB), 244 HWGRP_INIT(EPP), 245 HWGRP_INIT(G2), 246 HWGRP_INIT(HC), 247 HWGRP_INIT(HDA), 248 HWGRP_INIT(ISP), 249 HWGRP_INIT(MPE), 250 HWGRP_INIT(NV), 251 HWGRP_INIT(NV2), 252 HWGRP_INIT(PPCS), 253 HWGRP_INIT(SATA), 254 HWGRP_INIT(VDE), 255 HWGRP_INIT(VI), 256 }; 257 #define HWGRP_ASID_REG(x) (smmu_hwgrp_asid_reg[x]) 258 259 /* 260 * Per client for address space 261 */ 262 struct smmu_client { 263 struct device *dev; 264 struct list_head list; 265 struct smmu_as *as; 266 u32 hwgrp; 267 }; 268 269 /* 270 * Per address space 271 */ 272 struct smmu_as { 273 struct smmu_device *smmu; /* back pointer to container */ 274 unsigned int asid; 275 spinlock_t lock; /* for pagetable */ 276 struct page *pdir_page; 277 unsigned long pdir_attr; 278 unsigned long pde_attr; 279 unsigned long pte_attr; 280 unsigned int *pte_count; 281 282 struct list_head client; 283 spinlock_t client_lock; /* for client list */ 284 }; 285 286 struct smmu_debugfs_info { 287 struct smmu_device *smmu; 288 int mc; 289 int cache; 290 }; 291 292 /* 293 * Per SMMU device - IOMMU device 294 */ 295 struct smmu_device { 296 void __iomem *regs[NUM_SMMU_REG_BANKS]; 297 unsigned long iovmm_base; /* remappable base address */ 298 unsigned long page_count; /* total remappable size */ 299 spinlock_t lock; 300 char *name; 301 struct device *dev; 302 struct page *avp_vector_page; /* dummy page shared by all AS's */ 303 304 /* 305 * Register image savers for suspend/resume 306 */ 307 unsigned long translation_enable_0; 308 unsigned long translation_enable_1; 309 unsigned long translation_enable_2; 310 unsigned long asid_security; 311 312 struct dentry *debugfs_root; 313 struct smmu_debugfs_info *debugfs_info; 314 315 struct device_node *ahb; 316 317 int num_as; 318 struct smmu_as as[0]; /* Run-time allocated array */ 319 }; 320 321 static struct smmu_device *smmu_handle; /* unique for a system */ 322 323 /* 324 * SMMU register accessors 325 */ 326 static inline u32 smmu_read(struct smmu_device *smmu, size_t offs) 327 { 328 BUG_ON(offs < 0x10); 329 if (offs < 0x3c) 330 return readl(smmu->regs[0] + offs - 0x10); 331 BUG_ON(offs < 0x1f0); 332 if (offs < 0x200) 333 return readl(smmu->regs[1] + offs - 0x1f0); 334 BUG_ON(offs < 0x228); 335 if (offs < 0x284) 336 return readl(smmu->regs[2] + offs - 0x228); 337 BUG(); 338 } 339 340 static inline void smmu_write(struct smmu_device *smmu, u32 val, size_t offs) 341 { 342 BUG_ON(offs < 0x10); 343 if (offs < 0x3c) { 344 writel(val, smmu->regs[0] + offs - 0x10); 345 return; 346 } 347 BUG_ON(offs < 0x1f0); 348 if (offs < 0x200) { 349 writel(val, smmu->regs[1] + offs - 0x1f0); 350 return; 351 } 352 BUG_ON(offs < 0x228); 353 if (offs < 0x284) { 354 writel(val, smmu->regs[2] + offs - 0x228); 355 return; 356 } 357 BUG(); 358 } 359 360 #define VA_PAGE_TO_PA(va, page) \ 361 (page_to_phys(page) + ((unsigned long)(va) & ~PAGE_MASK)) 362 363 #define FLUSH_CPU_DCACHE(va, page, size) \ 364 do { \ 365 unsigned long _pa_ = VA_PAGE_TO_PA(va, page); \ 366 __cpuc_flush_dcache_area((void *)(va), (size_t)(size)); \ 367 outer_flush_range(_pa_, _pa_+(size_t)(size)); \ 368 } while (0) 369 370 /* 371 * Any interaction between any block on PPSB and a block on APB or AHB 372 * must have these read-back barriers to ensure the APB/AHB bus 373 * transaction is complete before initiating activity on the PPSB 374 * block. 375 */ 376 #define FLUSH_SMMU_REGS(smmu) smmu_read(smmu, SMMU_CONFIG) 377 378 #define smmu_client_hwgrp(c) (u32)((c)->dev->platform_data) 379 380 static int __smmu_client_set_hwgrp(struct smmu_client *c, 381 unsigned long map, int on) 382 { 383 int i; 384 struct smmu_as *as = c->as; 385 u32 val, offs, mask = SMMU_ASID_ENABLE(as->asid); 386 struct smmu_device *smmu = as->smmu; 387 388 WARN_ON(!on && map); 389 if (on && !map) 390 return -EINVAL; 391 if (!on) 392 map = smmu_client_hwgrp(c); 393 394 for_each_set_bit(i, &map, HWGRP_COUNT) { 395 offs = HWGRP_ASID_REG(i); 396 val = smmu_read(smmu, offs); 397 if (on) { 398 if (WARN_ON(val & mask)) 399 goto err_hw_busy; 400 val |= mask; 401 } else { 402 WARN_ON((val & mask) == mask); 403 val &= ~mask; 404 } 405 smmu_write(smmu, val, offs); 406 } 407 FLUSH_SMMU_REGS(smmu); 408 c->hwgrp = map; 409 return 0; 410 411 err_hw_busy: 412 for_each_set_bit(i, &map, HWGRP_COUNT) { 413 offs = HWGRP_ASID_REG(i); 414 val = smmu_read(smmu, offs); 415 val &= ~mask; 416 smmu_write(smmu, val, offs); 417 } 418 return -EBUSY; 419 } 420 421 static int smmu_client_set_hwgrp(struct smmu_client *c, u32 map, int on) 422 { 423 u32 val; 424 unsigned long flags; 425 struct smmu_as *as = c->as; 426 struct smmu_device *smmu = as->smmu; 427 428 spin_lock_irqsave(&smmu->lock, flags); 429 val = __smmu_client_set_hwgrp(c, map, on); 430 spin_unlock_irqrestore(&smmu->lock, flags); 431 return val; 432 } 433 434 /* 435 * Flush all TLB entries and all PTC entries 436 * Caller must lock smmu 437 */ 438 static void smmu_flush_regs(struct smmu_device *smmu, int enable) 439 { 440 u32 val; 441 442 smmu_write(smmu, SMMU_PTC_FLUSH_TYPE_ALL, SMMU_PTC_FLUSH); 443 FLUSH_SMMU_REGS(smmu); 444 val = SMMU_TLB_FLUSH_VA_MATCH_ALL | 445 SMMU_TLB_FLUSH_ASID_MATCH_disable; 446 smmu_write(smmu, val, SMMU_TLB_FLUSH); 447 448 if (enable) 449 smmu_write(smmu, SMMU_CONFIG_ENABLE, SMMU_CONFIG); 450 FLUSH_SMMU_REGS(smmu); 451 } 452 453 static int smmu_setup_regs(struct smmu_device *smmu) 454 { 455 int i; 456 u32 val; 457 458 for (i = 0; i < smmu->num_as; i++) { 459 struct smmu_as *as = &smmu->as[i]; 460 struct smmu_client *c; 461 462 smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID); 463 val = as->pdir_page ? 464 SMMU_MK_PDIR(as->pdir_page, as->pdir_attr) : 465 SMMU_PTB_DATA_RESET_VAL; 466 smmu_write(smmu, val, SMMU_PTB_DATA); 467 468 list_for_each_entry(c, &as->client, list) 469 __smmu_client_set_hwgrp(c, c->hwgrp, 1); 470 } 471 472 smmu_write(smmu, smmu->translation_enable_0, SMMU_TRANSLATION_ENABLE_0); 473 smmu_write(smmu, smmu->translation_enable_1, SMMU_TRANSLATION_ENABLE_1); 474 smmu_write(smmu, smmu->translation_enable_2, SMMU_TRANSLATION_ENABLE_2); 475 smmu_write(smmu, smmu->asid_security, SMMU_ASID_SECURITY); 476 smmu_write(smmu, SMMU_TLB_CONFIG_RESET_VAL, SMMU_CACHE_CONFIG(_TLB)); 477 smmu_write(smmu, SMMU_PTC_CONFIG_RESET_VAL, SMMU_CACHE_CONFIG(_PTC)); 478 479 smmu_flush_regs(smmu, 1); 480 481 return tegra_ahb_enable_smmu(smmu->ahb); 482 } 483 484 static void flush_ptc_and_tlb(struct smmu_device *smmu, 485 struct smmu_as *as, dma_addr_t iova, 486 unsigned long *pte, struct page *page, int is_pde) 487 { 488 u32 val; 489 unsigned long tlb_flush_va = is_pde 490 ? SMMU_TLB_FLUSH_VA(iova, SECTION) 491 : SMMU_TLB_FLUSH_VA(iova, GROUP); 492 493 val = SMMU_PTC_FLUSH_TYPE_ADR | VA_PAGE_TO_PA(pte, page); 494 smmu_write(smmu, val, SMMU_PTC_FLUSH); 495 FLUSH_SMMU_REGS(smmu); 496 val = tlb_flush_va | 497 SMMU_TLB_FLUSH_ASID_MATCH__ENABLE | 498 (as->asid << SMMU_TLB_FLUSH_ASID_SHIFT); 499 smmu_write(smmu, val, SMMU_TLB_FLUSH); 500 FLUSH_SMMU_REGS(smmu); 501 } 502 503 static void free_ptbl(struct smmu_as *as, dma_addr_t iova) 504 { 505 unsigned long pdn = SMMU_ADDR_TO_PDN(iova); 506 unsigned long *pdir = (unsigned long *)page_address(as->pdir_page); 507 508 if (pdir[pdn] != _PDE_VACANT(pdn)) { 509 dev_dbg(as->smmu->dev, "pdn: %lx\n", pdn); 510 511 ClearPageReserved(SMMU_EX_PTBL_PAGE(pdir[pdn])); 512 __free_page(SMMU_EX_PTBL_PAGE(pdir[pdn])); 513 pdir[pdn] = _PDE_VACANT(pdn); 514 FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]); 515 flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn], 516 as->pdir_page, 1); 517 } 518 } 519 520 static void free_pdir(struct smmu_as *as) 521 { 522 unsigned addr; 523 int count; 524 struct device *dev = as->smmu->dev; 525 526 if (!as->pdir_page) 527 return; 528 529 addr = as->smmu->iovmm_base; 530 count = as->smmu->page_count; 531 while (count-- > 0) { 532 free_ptbl(as, addr); 533 addr += SMMU_PAGE_SIZE * SMMU_PTBL_COUNT; 534 } 535 ClearPageReserved(as->pdir_page); 536 __free_page(as->pdir_page); 537 as->pdir_page = NULL; 538 devm_kfree(dev, as->pte_count); 539 as->pte_count = NULL; 540 } 541 542 /* 543 * Maps PTBL for given iova and returns the PTE address 544 * Caller must unmap the mapped PTBL returned in *ptbl_page_p 545 */ 546 static unsigned long *locate_pte(struct smmu_as *as, 547 dma_addr_t iova, bool allocate, 548 struct page **ptbl_page_p, 549 unsigned int **count) 550 { 551 unsigned long ptn = SMMU_ADDR_TO_PFN(iova); 552 unsigned long pdn = SMMU_ADDR_TO_PDN(iova); 553 unsigned long *pdir = page_address(as->pdir_page); 554 unsigned long *ptbl; 555 556 if (pdir[pdn] != _PDE_VACANT(pdn)) { 557 /* Mapped entry table already exists */ 558 *ptbl_page_p = SMMU_EX_PTBL_PAGE(pdir[pdn]); 559 ptbl = page_address(*ptbl_page_p); 560 } else if (!allocate) { 561 return NULL; 562 } else { 563 int pn; 564 unsigned long addr = SMMU_PDN_TO_ADDR(pdn); 565 566 /* Vacant - allocate a new page table */ 567 dev_dbg(as->smmu->dev, "New PTBL pdn: %lx\n", pdn); 568 569 *ptbl_page_p = alloc_page(GFP_ATOMIC); 570 if (!*ptbl_page_p) { 571 dev_err(as->smmu->dev, 572 "failed to allocate smmu_device page table\n"); 573 return NULL; 574 } 575 SetPageReserved(*ptbl_page_p); 576 ptbl = (unsigned long *)page_address(*ptbl_page_p); 577 for (pn = 0; pn < SMMU_PTBL_COUNT; 578 pn++, addr += SMMU_PAGE_SIZE) { 579 ptbl[pn] = _PTE_VACANT(addr); 580 } 581 FLUSH_CPU_DCACHE(ptbl, *ptbl_page_p, SMMU_PTBL_SIZE); 582 pdir[pdn] = SMMU_MK_PDE(*ptbl_page_p, 583 as->pde_attr | _PDE_NEXT); 584 FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]); 585 flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn], 586 as->pdir_page, 1); 587 } 588 *count = &as->pte_count[pdn]; 589 590 return &ptbl[ptn % SMMU_PTBL_COUNT]; 591 } 592 593 #ifdef CONFIG_SMMU_SIG_DEBUG 594 static void put_signature(struct smmu_as *as, 595 dma_addr_t iova, unsigned long pfn) 596 { 597 struct page *page; 598 unsigned long *vaddr; 599 600 page = pfn_to_page(pfn); 601 vaddr = page_address(page); 602 if (!vaddr) 603 return; 604 605 vaddr[0] = iova; 606 vaddr[1] = pfn << PAGE_SHIFT; 607 FLUSH_CPU_DCACHE(vaddr, page, sizeof(vaddr[0]) * 2); 608 } 609 #else 610 static inline void put_signature(struct smmu_as *as, 611 unsigned long addr, unsigned long pfn) 612 { 613 } 614 #endif 615 616 /* 617 * Caller must not hold as->lock 618 */ 619 static int alloc_pdir(struct smmu_as *as) 620 { 621 unsigned long *pdir, flags; 622 int pdn, err = 0; 623 u32 val; 624 struct smmu_device *smmu = as->smmu; 625 struct page *page; 626 unsigned int *cnt; 627 628 /* 629 * do the allocation, then grab as->lock 630 */ 631 cnt = devm_kzalloc(smmu->dev, 632 sizeof(cnt[0]) * SMMU_PDIR_COUNT, 633 GFP_KERNEL); 634 page = alloc_page(GFP_KERNEL | __GFP_DMA); 635 636 spin_lock_irqsave(&as->lock, flags); 637 638 if (as->pdir_page) { 639 /* We raced, free the redundant */ 640 err = -EAGAIN; 641 goto err_out; 642 } 643 644 if (!page || !cnt) { 645 dev_err(smmu->dev, "failed to allocate at %s\n", __func__); 646 err = -ENOMEM; 647 goto err_out; 648 } 649 650 as->pdir_page = page; 651 as->pte_count = cnt; 652 653 SetPageReserved(as->pdir_page); 654 pdir = page_address(as->pdir_page); 655 656 for (pdn = 0; pdn < SMMU_PDIR_COUNT; pdn++) 657 pdir[pdn] = _PDE_VACANT(pdn); 658 FLUSH_CPU_DCACHE(pdir, as->pdir_page, SMMU_PDIR_SIZE); 659 val = SMMU_PTC_FLUSH_TYPE_ADR | VA_PAGE_TO_PA(pdir, as->pdir_page); 660 smmu_write(smmu, val, SMMU_PTC_FLUSH); 661 FLUSH_SMMU_REGS(as->smmu); 662 val = SMMU_TLB_FLUSH_VA_MATCH_ALL | 663 SMMU_TLB_FLUSH_ASID_MATCH__ENABLE | 664 (as->asid << SMMU_TLB_FLUSH_ASID_SHIFT); 665 smmu_write(smmu, val, SMMU_TLB_FLUSH); 666 FLUSH_SMMU_REGS(as->smmu); 667 668 spin_unlock_irqrestore(&as->lock, flags); 669 670 return 0; 671 672 err_out: 673 spin_unlock_irqrestore(&as->lock, flags); 674 675 devm_kfree(smmu->dev, cnt); 676 if (page) 677 __free_page(page); 678 return err; 679 } 680 681 static void __smmu_iommu_unmap(struct smmu_as *as, dma_addr_t iova) 682 { 683 unsigned long *pte; 684 struct page *page; 685 unsigned int *count; 686 687 pte = locate_pte(as, iova, false, &page, &count); 688 if (WARN_ON(!pte)) 689 return; 690 691 if (WARN_ON(*pte == _PTE_VACANT(iova))) 692 return; 693 694 *pte = _PTE_VACANT(iova); 695 FLUSH_CPU_DCACHE(pte, page, sizeof(*pte)); 696 flush_ptc_and_tlb(as->smmu, as, iova, pte, page, 0); 697 if (!--(*count)) 698 free_ptbl(as, iova); 699 } 700 701 static void __smmu_iommu_map_pfn(struct smmu_as *as, dma_addr_t iova, 702 unsigned long pfn) 703 { 704 struct smmu_device *smmu = as->smmu; 705 unsigned long *pte; 706 unsigned int *count; 707 struct page *page; 708 709 pte = locate_pte(as, iova, true, &page, &count); 710 if (WARN_ON(!pte)) 711 return; 712 713 if (*pte == _PTE_VACANT(iova)) 714 (*count)++; 715 *pte = SMMU_PFN_TO_PTE(pfn, as->pte_attr); 716 if (unlikely((*pte == _PTE_VACANT(iova)))) 717 (*count)--; 718 FLUSH_CPU_DCACHE(pte, page, sizeof(*pte)); 719 flush_ptc_and_tlb(smmu, as, iova, pte, page, 0); 720 put_signature(as, iova, pfn); 721 } 722 723 static int smmu_iommu_map(struct iommu_domain *domain, unsigned long iova, 724 phys_addr_t pa, size_t bytes, int prot) 725 { 726 struct smmu_as *as = domain->priv; 727 unsigned long pfn = __phys_to_pfn(pa); 728 unsigned long flags; 729 730 dev_dbg(as->smmu->dev, "[%d] %08lx:%08x\n", as->asid, iova, pa); 731 732 if (!pfn_valid(pfn)) 733 return -ENOMEM; 734 735 spin_lock_irqsave(&as->lock, flags); 736 __smmu_iommu_map_pfn(as, iova, pfn); 737 spin_unlock_irqrestore(&as->lock, flags); 738 return 0; 739 } 740 741 static size_t smmu_iommu_unmap(struct iommu_domain *domain, unsigned long iova, 742 size_t bytes) 743 { 744 struct smmu_as *as = domain->priv; 745 unsigned long flags; 746 747 dev_dbg(as->smmu->dev, "[%d] %08lx\n", as->asid, iova); 748 749 spin_lock_irqsave(&as->lock, flags); 750 __smmu_iommu_unmap(as, iova); 751 spin_unlock_irqrestore(&as->lock, flags); 752 return SMMU_PAGE_SIZE; 753 } 754 755 static phys_addr_t smmu_iommu_iova_to_phys(struct iommu_domain *domain, 756 unsigned long iova) 757 { 758 struct smmu_as *as = domain->priv; 759 unsigned long *pte; 760 unsigned int *count; 761 struct page *page; 762 unsigned long pfn; 763 unsigned long flags; 764 765 spin_lock_irqsave(&as->lock, flags); 766 767 pte = locate_pte(as, iova, true, &page, &count); 768 pfn = *pte & SMMU_PFN_MASK; 769 WARN_ON(!pfn_valid(pfn)); 770 dev_dbg(as->smmu->dev, 771 "iova:%08lx pfn:%08lx asid:%d\n", iova, pfn, as->asid); 772 773 spin_unlock_irqrestore(&as->lock, flags); 774 return PFN_PHYS(pfn); 775 } 776 777 static int smmu_iommu_domain_has_cap(struct iommu_domain *domain, 778 unsigned long cap) 779 { 780 return 0; 781 } 782 783 static int smmu_iommu_attach_dev(struct iommu_domain *domain, 784 struct device *dev) 785 { 786 struct smmu_as *as = domain->priv; 787 struct smmu_device *smmu = as->smmu; 788 struct smmu_client *client, *c; 789 u32 map; 790 int err; 791 792 client = devm_kzalloc(smmu->dev, sizeof(*c), GFP_KERNEL); 793 if (!client) 794 return -ENOMEM; 795 client->dev = dev; 796 client->as = as; 797 map = (unsigned long)dev->platform_data; 798 if (!map) 799 return -EINVAL; 800 801 err = smmu_client_enable_hwgrp(client, map); 802 if (err) 803 goto err_hwgrp; 804 805 spin_lock(&as->client_lock); 806 list_for_each_entry(c, &as->client, list) { 807 if (c->dev == dev) { 808 dev_err(smmu->dev, 809 "%s is already attached\n", dev_name(c->dev)); 810 err = -EINVAL; 811 goto err_client; 812 } 813 } 814 list_add(&client->list, &as->client); 815 spin_unlock(&as->client_lock); 816 817 /* 818 * Reserve "page zero" for AVP vectors using a common dummy 819 * page. 820 */ 821 if (map & HWG_AVPC) { 822 struct page *page; 823 824 page = as->smmu->avp_vector_page; 825 __smmu_iommu_map_pfn(as, 0, page_to_pfn(page)); 826 827 pr_info("Reserve \"page zero\" for AVP vectors using a common dummy\n"); 828 } 829 830 dev_dbg(smmu->dev, "%s is attached\n", dev_name(dev)); 831 return 0; 832 833 err_client: 834 smmu_client_disable_hwgrp(client); 835 spin_unlock(&as->client_lock); 836 err_hwgrp: 837 devm_kfree(smmu->dev, client); 838 return err; 839 } 840 841 static void smmu_iommu_detach_dev(struct iommu_domain *domain, 842 struct device *dev) 843 { 844 struct smmu_as *as = domain->priv; 845 struct smmu_device *smmu = as->smmu; 846 struct smmu_client *c; 847 848 spin_lock(&as->client_lock); 849 850 list_for_each_entry(c, &as->client, list) { 851 if (c->dev == dev) { 852 smmu_client_disable_hwgrp(c); 853 list_del(&c->list); 854 devm_kfree(smmu->dev, c); 855 c->as = NULL; 856 dev_dbg(smmu->dev, 857 "%s is detached\n", dev_name(c->dev)); 858 goto out; 859 } 860 } 861 dev_err(smmu->dev, "Couldn't find %s\n", dev_name(dev)); 862 out: 863 spin_unlock(&as->client_lock); 864 } 865 866 static int smmu_iommu_domain_init(struct iommu_domain *domain) 867 { 868 int i, err = -EAGAIN; 869 unsigned long flags; 870 struct smmu_as *as; 871 struct smmu_device *smmu = smmu_handle; 872 873 /* Look for a free AS with lock held */ 874 for (i = 0; i < smmu->num_as; i++) { 875 as = &smmu->as[i]; 876 877 if (as->pdir_page) 878 continue; 879 880 err = alloc_pdir(as); 881 if (!err) 882 goto found; 883 884 if (err != -EAGAIN) 885 break; 886 } 887 if (i == smmu->num_as) 888 dev_err(smmu->dev, "no free AS\n"); 889 return err; 890 891 found: 892 spin_lock_irqsave(&smmu->lock, flags); 893 894 /* Update PDIR register */ 895 smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID); 896 smmu_write(smmu, 897 SMMU_MK_PDIR(as->pdir_page, as->pdir_attr), SMMU_PTB_DATA); 898 FLUSH_SMMU_REGS(smmu); 899 900 spin_unlock_irqrestore(&smmu->lock, flags); 901 902 domain->priv = as; 903 904 domain->geometry.aperture_start = smmu->iovmm_base; 905 domain->geometry.aperture_end = smmu->iovmm_base + 906 smmu->page_count * SMMU_PAGE_SIZE - 1; 907 domain->geometry.force_aperture = true; 908 909 dev_dbg(smmu->dev, "smmu_as@%p\n", as); 910 911 return 0; 912 } 913 914 static void smmu_iommu_domain_destroy(struct iommu_domain *domain) 915 { 916 struct smmu_as *as = domain->priv; 917 struct smmu_device *smmu = as->smmu; 918 unsigned long flags; 919 920 spin_lock_irqsave(&as->lock, flags); 921 922 if (as->pdir_page) { 923 spin_lock(&smmu->lock); 924 smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID); 925 smmu_write(smmu, SMMU_PTB_DATA_RESET_VAL, SMMU_PTB_DATA); 926 FLUSH_SMMU_REGS(smmu); 927 spin_unlock(&smmu->lock); 928 929 free_pdir(as); 930 } 931 932 if (!list_empty(&as->client)) { 933 struct smmu_client *c; 934 935 list_for_each_entry(c, &as->client, list) 936 smmu_iommu_detach_dev(domain, c->dev); 937 } 938 939 spin_unlock_irqrestore(&as->lock, flags); 940 941 domain->priv = NULL; 942 dev_dbg(smmu->dev, "smmu_as@%p\n", as); 943 } 944 945 static struct iommu_ops smmu_iommu_ops = { 946 .domain_init = smmu_iommu_domain_init, 947 .domain_destroy = smmu_iommu_domain_destroy, 948 .attach_dev = smmu_iommu_attach_dev, 949 .detach_dev = smmu_iommu_detach_dev, 950 .map = smmu_iommu_map, 951 .unmap = smmu_iommu_unmap, 952 .iova_to_phys = smmu_iommu_iova_to_phys, 953 .domain_has_cap = smmu_iommu_domain_has_cap, 954 .pgsize_bitmap = SMMU_IOMMU_PGSIZES, 955 }; 956 957 /* Should be in the order of enum */ 958 static const char * const smmu_debugfs_mc[] = { "mc", }; 959 static const char * const smmu_debugfs_cache[] = { "tlb", "ptc", }; 960 961 static ssize_t smmu_debugfs_stats_write(struct file *file, 962 const char __user *buffer, 963 size_t count, loff_t *pos) 964 { 965 struct smmu_debugfs_info *info; 966 struct smmu_device *smmu; 967 struct dentry *dent; 968 int i; 969 enum { 970 _OFF = 0, 971 _ON, 972 _RESET, 973 }; 974 const char * const command[] = { 975 [_OFF] = "off", 976 [_ON] = "on", 977 [_RESET] = "reset", 978 }; 979 char str[] = "reset"; 980 u32 val; 981 size_t offs; 982 983 count = min_t(size_t, count, sizeof(str)); 984 if (copy_from_user(str, buffer, count)) 985 return -EINVAL; 986 987 for (i = 0; i < ARRAY_SIZE(command); i++) 988 if (strncmp(str, command[i], 989 strlen(command[i])) == 0) 990 break; 991 992 if (i == ARRAY_SIZE(command)) 993 return -EINVAL; 994 995 dent = file->f_dentry; 996 info = dent->d_inode->i_private; 997 smmu = info->smmu; 998 999 offs = SMMU_CACHE_CONFIG(info->cache); 1000 val = smmu_read(smmu, offs); 1001 switch (i) { 1002 case _OFF: 1003 val &= ~SMMU_CACHE_CONFIG_STATS_ENABLE; 1004 val &= ~SMMU_CACHE_CONFIG_STATS_TEST; 1005 smmu_write(smmu, val, offs); 1006 break; 1007 case _ON: 1008 val |= SMMU_CACHE_CONFIG_STATS_ENABLE; 1009 val &= ~SMMU_CACHE_CONFIG_STATS_TEST; 1010 smmu_write(smmu, val, offs); 1011 break; 1012 case _RESET: 1013 val |= SMMU_CACHE_CONFIG_STATS_TEST; 1014 smmu_write(smmu, val, offs); 1015 val &= ~SMMU_CACHE_CONFIG_STATS_TEST; 1016 smmu_write(smmu, val, offs); 1017 break; 1018 default: 1019 BUG(); 1020 break; 1021 } 1022 1023 dev_dbg(smmu->dev, "%s() %08x, %08x @%08x\n", __func__, 1024 val, smmu_read(smmu, offs), offs); 1025 1026 return count; 1027 } 1028 1029 static int smmu_debugfs_stats_show(struct seq_file *s, void *v) 1030 { 1031 struct smmu_debugfs_info *info; 1032 struct smmu_device *smmu; 1033 struct dentry *dent; 1034 int i; 1035 const char * const stats[] = { "hit", "miss", }; 1036 1037 dent = d_find_alias(s->private); 1038 info = dent->d_inode->i_private; 1039 smmu = info->smmu; 1040 1041 for (i = 0; i < ARRAY_SIZE(stats); i++) { 1042 u32 val; 1043 size_t offs; 1044 1045 offs = SMMU_STATS_CACHE_COUNT(info->mc, info->cache, i); 1046 val = smmu_read(smmu, offs); 1047 seq_printf(s, "%s:%08x ", stats[i], val); 1048 1049 dev_dbg(smmu->dev, "%s() %s %08x @%08x\n", __func__, 1050 stats[i], val, offs); 1051 } 1052 seq_printf(s, "\n"); 1053 dput(dent); 1054 1055 return 0; 1056 } 1057 1058 static int smmu_debugfs_stats_open(struct inode *inode, struct file *file) 1059 { 1060 return single_open(file, smmu_debugfs_stats_show, inode); 1061 } 1062 1063 static const struct file_operations smmu_debugfs_stats_fops = { 1064 .open = smmu_debugfs_stats_open, 1065 .read = seq_read, 1066 .llseek = seq_lseek, 1067 .release = single_release, 1068 .write = smmu_debugfs_stats_write, 1069 }; 1070 1071 static void smmu_debugfs_delete(struct smmu_device *smmu) 1072 { 1073 debugfs_remove_recursive(smmu->debugfs_root); 1074 kfree(smmu->debugfs_info); 1075 } 1076 1077 static void smmu_debugfs_create(struct smmu_device *smmu) 1078 { 1079 int i; 1080 size_t bytes; 1081 struct dentry *root; 1082 1083 bytes = ARRAY_SIZE(smmu_debugfs_mc) * ARRAY_SIZE(smmu_debugfs_cache) * 1084 sizeof(*smmu->debugfs_info); 1085 smmu->debugfs_info = kmalloc(bytes, GFP_KERNEL); 1086 if (!smmu->debugfs_info) 1087 return; 1088 1089 root = debugfs_create_dir(dev_name(smmu->dev), NULL); 1090 if (!root) 1091 goto err_out; 1092 smmu->debugfs_root = root; 1093 1094 for (i = 0; i < ARRAY_SIZE(smmu_debugfs_mc); i++) { 1095 int j; 1096 struct dentry *mc; 1097 1098 mc = debugfs_create_dir(smmu_debugfs_mc[i], root); 1099 if (!mc) 1100 goto err_out; 1101 1102 for (j = 0; j < ARRAY_SIZE(smmu_debugfs_cache); j++) { 1103 struct dentry *cache; 1104 struct smmu_debugfs_info *info; 1105 1106 info = smmu->debugfs_info; 1107 info += i * ARRAY_SIZE(smmu_debugfs_mc) + j; 1108 info->smmu = smmu; 1109 info->mc = i; 1110 info->cache = j; 1111 1112 cache = debugfs_create_file(smmu_debugfs_cache[j], 1113 S_IWUGO | S_IRUGO, mc, 1114 (void *)info, 1115 &smmu_debugfs_stats_fops); 1116 if (!cache) 1117 goto err_out; 1118 } 1119 } 1120 1121 return; 1122 1123 err_out: 1124 smmu_debugfs_delete(smmu); 1125 } 1126 1127 static int tegra_smmu_suspend(struct device *dev) 1128 { 1129 struct smmu_device *smmu = dev_get_drvdata(dev); 1130 1131 smmu->translation_enable_0 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_0); 1132 smmu->translation_enable_1 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_1); 1133 smmu->translation_enable_2 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_2); 1134 smmu->asid_security = smmu_read(smmu, SMMU_ASID_SECURITY); 1135 return 0; 1136 } 1137 1138 static int tegra_smmu_resume(struct device *dev) 1139 { 1140 struct smmu_device *smmu = dev_get_drvdata(dev); 1141 unsigned long flags; 1142 int err; 1143 1144 spin_lock_irqsave(&smmu->lock, flags); 1145 err = smmu_setup_regs(smmu); 1146 spin_unlock_irqrestore(&smmu->lock, flags); 1147 return err; 1148 } 1149 1150 static int tegra_smmu_probe(struct platform_device *pdev) 1151 { 1152 struct smmu_device *smmu; 1153 struct device *dev = &pdev->dev; 1154 int i, asids, err = 0; 1155 dma_addr_t uninitialized_var(base); 1156 size_t bytes, uninitialized_var(size); 1157 1158 if (smmu_handle) 1159 return -EIO; 1160 1161 BUILD_BUG_ON(PAGE_SHIFT != SMMU_PAGE_SHIFT); 1162 1163 if (of_property_read_u32(dev->of_node, "nvidia,#asids", &asids)) 1164 return -ENODEV; 1165 1166 bytes = sizeof(*smmu) + asids * sizeof(*smmu->as); 1167 smmu = devm_kzalloc(dev, bytes, GFP_KERNEL); 1168 if (!smmu) { 1169 dev_err(dev, "failed to allocate smmu_device\n"); 1170 return -ENOMEM; 1171 } 1172 1173 for (i = 0; i < ARRAY_SIZE(smmu->regs); i++) { 1174 struct resource *res; 1175 1176 res = platform_get_resource(pdev, IORESOURCE_MEM, i); 1177 if (!res) 1178 return -ENODEV; 1179 smmu->regs[i] = devm_request_and_ioremap(&pdev->dev, res); 1180 if (!smmu->regs[i]) 1181 return -EBUSY; 1182 } 1183 1184 err = of_get_dma_window(dev->of_node, NULL, 0, NULL, &base, &size); 1185 if (err) 1186 return -ENODEV; 1187 1188 if (size & SMMU_PAGE_MASK) 1189 return -EINVAL; 1190 1191 size >>= SMMU_PAGE_SHIFT; 1192 if (!size) 1193 return -EINVAL; 1194 1195 smmu->ahb = of_parse_phandle(dev->of_node, "nvidia,ahb", 0); 1196 if (!smmu->ahb) 1197 return -ENODEV; 1198 1199 smmu->dev = dev; 1200 smmu->num_as = asids; 1201 smmu->iovmm_base = base; 1202 smmu->page_count = size; 1203 1204 smmu->translation_enable_0 = ~0; 1205 smmu->translation_enable_1 = ~0; 1206 smmu->translation_enable_2 = ~0; 1207 smmu->asid_security = 0; 1208 1209 for (i = 0; i < smmu->num_as; i++) { 1210 struct smmu_as *as = &smmu->as[i]; 1211 1212 as->smmu = smmu; 1213 as->asid = i; 1214 as->pdir_attr = _PDIR_ATTR; 1215 as->pde_attr = _PDE_ATTR; 1216 as->pte_attr = _PTE_ATTR; 1217 1218 spin_lock_init(&as->lock); 1219 INIT_LIST_HEAD(&as->client); 1220 } 1221 spin_lock_init(&smmu->lock); 1222 err = smmu_setup_regs(smmu); 1223 if (err) 1224 return err; 1225 platform_set_drvdata(pdev, smmu); 1226 1227 smmu->avp_vector_page = alloc_page(GFP_KERNEL); 1228 if (!smmu->avp_vector_page) 1229 return -ENOMEM; 1230 1231 smmu_debugfs_create(smmu); 1232 smmu_handle = smmu; 1233 bus_set_iommu(&platform_bus_type, &smmu_iommu_ops); 1234 return 0; 1235 } 1236 1237 static int tegra_smmu_remove(struct platform_device *pdev) 1238 { 1239 struct smmu_device *smmu = platform_get_drvdata(pdev); 1240 int i; 1241 1242 smmu_debugfs_delete(smmu); 1243 1244 smmu_write(smmu, SMMU_CONFIG_DISABLE, SMMU_CONFIG); 1245 for (i = 0; i < smmu->num_as; i++) 1246 free_pdir(&smmu->as[i]); 1247 __free_page(smmu->avp_vector_page); 1248 smmu_handle = NULL; 1249 return 0; 1250 } 1251 1252 const struct dev_pm_ops tegra_smmu_pm_ops = { 1253 .suspend = tegra_smmu_suspend, 1254 .resume = tegra_smmu_resume, 1255 }; 1256 1257 #ifdef CONFIG_OF 1258 static struct of_device_id tegra_smmu_of_match[] = { 1259 { .compatible = "nvidia,tegra30-smmu", }, 1260 { }, 1261 }; 1262 MODULE_DEVICE_TABLE(of, tegra_smmu_of_match); 1263 #endif 1264 1265 static struct platform_driver tegra_smmu_driver = { 1266 .probe = tegra_smmu_probe, 1267 .remove = tegra_smmu_remove, 1268 .driver = { 1269 .owner = THIS_MODULE, 1270 .name = "tegra-smmu", 1271 .pm = &tegra_smmu_pm_ops, 1272 .of_match_table = of_match_ptr(tegra_smmu_of_match), 1273 }, 1274 }; 1275 1276 static int tegra_smmu_init(void) 1277 { 1278 return platform_driver_register(&tegra_smmu_driver); 1279 } 1280 1281 static void __exit tegra_smmu_exit(void) 1282 { 1283 platform_driver_unregister(&tegra_smmu_driver); 1284 } 1285 1286 subsys_initcall(tegra_smmu_init); 1287 module_exit(tegra_smmu_exit); 1288 1289 MODULE_DESCRIPTION("IOMMU API for SMMU in Tegra30"); 1290 MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>"); 1291 MODULE_ALIAS("platform:tegra-smmu"); 1292 MODULE_LICENSE("GPL v2"); 1293