drivers/iommu/tegra-smmu.c

   1 /*
   2  * IOMMU API for SMMU in Tegra30
   3  *
   4  * Copyright (c) 2011-2013, 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/err.h>
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/slab.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/mm.h>
  29 #include <linux/pagemap.h>
  30 #include <linux/device.h>
  31 #include <linux/sched.h>
  32 #include <linux/iommu.h>
  33 #include <linux/io.h>
  34 #include <linux/of.h>
  35 #include <linux/of_iommu.h>
  36 #include <linux/debugfs.h>
  37 #include <linux/seq_file.h>
  38 #include <linux/tegra-ahb.h>
  39
  40 #include <asm/page.h>
  41 #include <asm/cacheflush.h>
  42
  43 enum smmu_hwgrp {
  44         HWGRP_AFI,
  45         HWGRP_AVPC,
  46         HWGRP_DC,
  47         HWGRP_DCB,
  48         HWGRP_EPP,
  49         HWGRP_G2,
  50         HWGRP_HC,
  51         HWGRP_HDA,
  52         HWGRP_ISP,
  53         HWGRP_MPE,
  54         HWGRP_NV,
  55         HWGRP_NV2,
  56         HWGRP_PPCS,
  57         HWGRP_SATA,
  58         HWGRP_VDE,
  59         HWGRP_VI,
  60
  61         HWGRP_COUNT,
  62
  63         HWGRP_END = ~0,
  64 };
  65
  66 #define HWG_AFI         (1 << HWGRP_AFI)
  67 #define HWG_AVPC        (1 << HWGRP_AVPC)
  68 #define HWG_DC          (1 << HWGRP_DC)
  69 #define HWG_DCB         (1 << HWGRP_DCB)
  70 #define HWG_EPP         (1 << HWGRP_EPP)
  71 #define HWG_G2          (1 << HWGRP_G2)
  72 #define HWG_HC          (1 << HWGRP_HC)
  73 #define HWG_HDA         (1 << HWGRP_HDA)
  74 #define HWG_ISP         (1 << HWGRP_ISP)
  75 #define HWG_MPE         (1 << HWGRP_MPE)
  76 #define HWG_NV          (1 << HWGRP_NV)
  77 #define HWG_NV2         (1 << HWGRP_NV2)
  78 #define HWG_PPCS        (1 << HWGRP_PPCS)
  79 #define HWG_SATA        (1 << HWGRP_SATA)
  80 #define HWG_VDE         (1 << HWGRP_VDE)
  81 #define HWG_VI          (1 << HWGRP_VI)
  82
  83 /* bitmap of the page sizes currently supported */
  84 #define SMMU_IOMMU_PGSIZES      (SZ_4K)
  85
  86 #define SMMU_CONFIG                             0x10
  87 #define SMMU_CONFIG_DISABLE                     0
  88 #define SMMU_CONFIG_ENABLE                      1
  89
  90 /* REVISIT: To support multiple MCs */
  91 enum {
  92         _MC = 0,
  93 };
  94
  95 enum {
  96         _TLB = 0,
  97         _PTC,
  98 };
  99
 100 #define SMMU_CACHE_CONFIG_BASE                  0x14
 101 #define __SMMU_CACHE_CONFIG(mc, cache)          (SMMU_CACHE_CONFIG_BASE + 4 * cache)
 102 #define SMMU_CACHE_CONFIG(cache)                __SMMU_CACHE_CONFIG(_MC, cache)
 103
 104 #define SMMU_CACHE_CONFIG_STATS_SHIFT           31
 105 #define SMMU_CACHE_CONFIG_STATS_ENABLE          (1 << SMMU_CACHE_CONFIG_STATS_SHIFT)
 106 #define SMMU_CACHE_CONFIG_STATS_TEST_SHIFT      30
 107 #define SMMU_CACHE_CONFIG_STATS_TEST            (1 << SMMU_CACHE_CONFIG_STATS_TEST_SHIFT)
 108
 109 #define SMMU_TLB_CONFIG_HIT_UNDER_MISS__ENABLE  (1 << 29)
 110 #define SMMU_TLB_CONFIG_ACTIVE_LINES__VALUE     0x10
 111 #define SMMU_TLB_CONFIG_RESET_VAL               0x20000010
 112
 113 #define SMMU_PTC_CONFIG_CACHE__ENABLE           (1 << 29)
 114 #define SMMU_PTC_CONFIG_INDEX_MAP__PATTERN      0x3f
 115 #define SMMU_PTC_CONFIG_RESET_VAL               0x2000003f
 116
 117 #define SMMU_PTB_ASID                           0x1c
 118 #define SMMU_PTB_ASID_CURRENT_SHIFT             0
 119
 120 #define SMMU_PTB_DATA                           0x20
 121 #define SMMU_PTB_DATA_RESET_VAL                 0
 122 #define SMMU_PTB_DATA_ASID_NONSECURE_SHIFT      29
 123 #define SMMU_PTB_DATA_ASID_WRITABLE_SHIFT       30
 124 #define SMMU_PTB_DATA_ASID_READABLE_SHIFT       31
 125
 126 #define SMMU_TLB_FLUSH                          0x30
 127 #define SMMU_TLB_FLUSH_VA_MATCH_ALL             0
 128 #define SMMU_TLB_FLUSH_VA_MATCH_SECTION         2
 129 #define SMMU_TLB_FLUSH_VA_MATCH_GROUP           3
 130 #define SMMU_TLB_FLUSH_ASID_SHIFT               29
 131 #define SMMU_TLB_FLUSH_ASID_MATCH_DISABLE       0
 132 #define SMMU_TLB_FLUSH_ASID_MATCH_ENABLE        1
 133 #define SMMU_TLB_FLUSH_ASID_MATCH_SHIFT         31
 134
 135 #define SMMU_PTC_FLUSH                          0x34
 136 #define SMMU_PTC_FLUSH_TYPE_ALL                 0
 137 #define SMMU_PTC_FLUSH_TYPE_ADR                 1
 138 #define SMMU_PTC_FLUSH_ADR_SHIFT                4
 139
 140 #define SMMU_ASID_SECURITY                      0x38
 141
 142 #define SMMU_STATS_CACHE_COUNT_BASE             0x1f0
 143
 144 #define SMMU_STATS_CACHE_COUNT(mc, cache, hitmiss)              \
 145         (SMMU_STATS_CACHE_COUNT_BASE + 8 * cache + 4 * hitmiss)
 146
 147 #define SMMU_TRANSLATION_ENABLE_0               0x228
 148 #define SMMU_TRANSLATION_ENABLE_1               0x22c
 149 #define SMMU_TRANSLATION_ENABLE_2               0x230
 150
 151 #define SMMU_AFI_ASID   0x238   /* PCIE */
 152 #define SMMU_AVPC_ASID  0x23c   /* AVP */
 153 #define SMMU_DC_ASID    0x240   /* Display controller */
 154 #define SMMU_DCB_ASID   0x244   /* Display controller B */
 155 #define SMMU_EPP_ASID   0x248   /* Encoder pre-processor */
 156 #define SMMU_G2_ASID    0x24c   /* 2D engine */
 157 #define SMMU_HC_ASID    0x250   /* Host1x */
 158 #define SMMU_HDA_ASID   0x254   /* High-def audio */
 159 #define SMMU_ISP_ASID   0x258   /* Image signal processor */
 160 #define SMMU_MPE_ASID   0x264   /* MPEG encoder */
 161 #define SMMU_NV_ASID    0x268   /* (3D) */
 162 #define SMMU_NV2_ASID   0x26c   /* (3D) */
 163 #define SMMU_PPCS_ASID  0x270   /* AHB */
 164 #define SMMU_SATA_ASID  0x278   /* SATA */
 165 #define SMMU_VDE_ASID   0x27c   /* Video decoder */
 166 #define SMMU_VI_ASID    0x280   /* Video input */
 167
 168 #define SMMU_PDE_NEXT_SHIFT             28
 169
 170 #define SMMU_TLB_FLUSH_VA_SECTION__MASK         0xffc00000
 171 #define SMMU_TLB_FLUSH_VA_SECTION__SHIFT        12 /* right shift */
 172 #define SMMU_TLB_FLUSH_VA_GROUP__MASK           0xffffc000
 173 #define SMMU_TLB_FLUSH_VA_GROUP__SHIFT          12 /* right shift */
 174 #define SMMU_TLB_FLUSH_VA(iova, which)  \
 175         ((((iova) & SMMU_TLB_FLUSH_VA_##which##__MASK) >> \
 176                 SMMU_TLB_FLUSH_VA_##which##__SHIFT) |   \
 177         SMMU_TLB_FLUSH_VA_MATCH_##which)
 178 #define SMMU_PTB_ASID_CUR(n)    \
 179                 ((n) << SMMU_PTB_ASID_CURRENT_SHIFT)
 180 #define SMMU_TLB_FLUSH_ASID_MATCH_disable               \
 181                 (SMMU_TLB_FLUSH_ASID_MATCH_DISABLE <<   \
 182                         SMMU_TLB_FLUSH_ASID_MATCH_SHIFT)
 183 #define SMMU_TLB_FLUSH_ASID_MATCH__ENABLE               \
 184                 (SMMU_TLB_FLUSH_ASID_MATCH_ENABLE <<    \
 185                         SMMU_TLB_FLUSH_ASID_MATCH_SHIFT)
 186
 187 #define SMMU_PAGE_SHIFT 12
 188 #define SMMU_PAGE_SIZE  (1 << SMMU_PAGE_SHIFT)
 189 #define SMMU_PAGE_MASK  ((1 << SMMU_PAGE_SHIFT) - 1)
 190
 191 #define SMMU_PDIR_COUNT 1024
 192 #define SMMU_PDIR_SIZE  (sizeof(unsigned long) * SMMU_PDIR_COUNT)
 193 #define SMMU_PTBL_COUNT 1024
 194 #define SMMU_PTBL_SIZE  (sizeof(unsigned long) * SMMU_PTBL_COUNT)
 195 #define SMMU_PDIR_SHIFT 12
 196 #define SMMU_PDE_SHIFT  12
 197 #define SMMU_PTE_SHIFT  12
 198 #define SMMU_PFN_MASK   0x000fffff
 199
 200 #define SMMU_ADDR_TO_PFN(addr)  ((addr) >> 12)
 201 #define SMMU_ADDR_TO_PDN(addr)  ((addr) >> 22)
 202 #define SMMU_PDN_TO_ADDR(pdn)   ((pdn) << 22)
 203
 204 #define _READABLE       (1 << SMMU_PTB_DATA_ASID_READABLE_SHIFT)
 205 #define _WRITABLE       (1 << SMMU_PTB_DATA_ASID_WRITABLE_SHIFT)
 206 #define _NONSECURE      (1 << SMMU_PTB_DATA_ASID_NONSECURE_SHIFT)
 207 #define _PDE_NEXT       (1 << SMMU_PDE_NEXT_SHIFT)
 208 #define _MASK_ATTR      (_READABLE | _WRITABLE | _NONSECURE)
 209
 210 #define _PDIR_ATTR      (_READABLE | _WRITABLE | _NONSECURE)
 211
 212 #define _PDE_ATTR       (_READABLE | _WRITABLE | _NONSECURE)
 213 #define _PDE_ATTR_N     (_PDE_ATTR | _PDE_NEXT)
 214 #define _PDE_VACANT(pdn)        (((pdn) << 10) | _PDE_ATTR)
 215
 216 #define _PTE_ATTR       (_READABLE | _WRITABLE | _NONSECURE)
 217 #define _PTE_VACANT(addr)       (((addr) >> SMMU_PAGE_SHIFT) | _PTE_ATTR)
 218
 219 #define SMMU_MK_PDIR(page, attr)        \
 220                 ((page_to_phys(page) >> SMMU_PDIR_SHIFT) | (attr))
 221 #define SMMU_MK_PDE(page, attr)         \
 222                 (unsigned long)((page_to_phys(page) >> SMMU_PDE_SHIFT) | (attr))
 223 #define SMMU_EX_PTBL_PAGE(pde)          \
 224                 pfn_to_page((unsigned long)(pde) & SMMU_PFN_MASK)
 225 #define SMMU_PFN_TO_PTE(pfn, attr)      (unsigned long)((pfn) | (attr))
 226
 227 #define SMMU_ASID_ENABLE(asid)  ((asid) | (1 << 31))
 228 #define SMMU_ASID_DISABLE       0
 229 #define SMMU_ASID_ASID(n)       ((n) & ~SMMU_ASID_ENABLE(0))
 230
 231 #define NUM_SMMU_REG_BANKS      3
 232
 233 #define smmu_client_enable_hwgrp(c, m)  smmu_client_set_hwgrp(c, m, 1)
 234 #define smmu_client_disable_hwgrp(c)    smmu_client_set_hwgrp(c, 0, 0)
 235 #define __smmu_client_enable_hwgrp(c, m) __smmu_client_set_hwgrp(c, m, 1)
 236 #define __smmu_client_disable_hwgrp(c)  __smmu_client_set_hwgrp(c, 0, 0)
 237
 238 #define HWGRP_INIT(client) [HWGRP_##client] = SMMU_##client##_ASID
 239
 240 static const u32 smmu_hwgrp_asid_reg[] = {
 241         HWGRP_INIT(AFI),
 242         HWGRP_INIT(AVPC),
 243         HWGRP_INIT(DC),
 244         HWGRP_INIT(DCB),
 245         HWGRP_INIT(EPP),
 246         HWGRP_INIT(G2),
 247         HWGRP_INIT(HC),
 248         HWGRP_INIT(HDA),
 249         HWGRP_INIT(ISP),
 250         HWGRP_INIT(MPE),
 251         HWGRP_INIT(NV),
 252         HWGRP_INIT(NV2),
 253         HWGRP_INIT(PPCS),
 254         HWGRP_INIT(SATA),
 255         HWGRP_INIT(VDE),
 256         HWGRP_INIT(VI),
 257 };
 258 #define HWGRP_ASID_REG(x) (smmu_hwgrp_asid_reg[x])
 259
 260 /*
 261  * Per client for address space
 262  */
 263 struct smmu_client {
 264         struct device           *dev;
 265         struct list_head        list;
 266         struct smmu_as          *as;
 267         u32                     hwgrp;
 268 };
 269
 270 /*
 271  * Per address space
 272  */
 273 struct smmu_as {
 274         struct smmu_device      *smmu;  /* back pointer to container */
 275         unsigned int            asid;
 276         spinlock_t              lock;   /* for pagetable */
 277         struct page             *pdir_page;
 278         unsigned long           pdir_attr;
 279         unsigned long           pde_attr;
 280         unsigned long           pte_attr;
 281         unsigned int            *pte_count;
 282
 283         struct list_head        client;
 284         spinlock_t              client_lock; /* for client list */
 285 };
 286
 287 struct smmu_debugfs_info {
 288         struct smmu_device *smmu;
 289         int mc;
 290         int cache;
 291 };
 292
 293 /*
 294  * Per SMMU device - IOMMU device
 295  */
 296 struct smmu_device {
 297         void __iomem    *regbase;       /* register offset base */
 298         void __iomem    **regs;         /* register block start address array */
 299         void __iomem    **rege;         /* register block end address array */
 300         int             nregs;          /* number of register blocks */
 301
 302         unsigned long   iovmm_base;     /* remappable base address */
 303         unsigned long   page_count;     /* total remappable size */
 304         spinlock_t      lock;
 305         char            *name;
 306         struct device   *dev;
 307         struct page *avp_vector_page;   /* dummy page shared by all AS's */
 308
 309         /*
 310          * Register image savers for suspend/resume
 311          */
 312         unsigned long translation_enable_0;
 313         unsigned long translation_enable_1;
 314         unsigned long translation_enable_2;
 315         unsigned long asid_security;
 316
 317         struct dentry *debugfs_root;
 318         struct smmu_debugfs_info *debugfs_info;
 319
 320         struct device_node *ahb;
 321
 322         int             num_as;
 323         struct smmu_as  as[0];          /* Run-time allocated array */
 324 };
 325
 326 static struct smmu_device *smmu_handle; /* unique for a system */
 327
 328 /*
 329  *      SMMU register accessors
 330  */
 331 static bool inline smmu_valid_reg(struct smmu_device *smmu,
 332                                   void __iomem *addr)
 333 {
 334         int i;
 335
 336         for (i = 0; i < smmu->nregs; i++) {
 337                 if (addr < smmu->regs[i])
 338                         break;
 339                 if (addr <= smmu->rege[i])
 340                         return true;
 341         }
 342
 343         return false;
 344 }
 345
 346 static inline u32 smmu_read(struct smmu_device *smmu, size_t offs)
 347 {
 348         void __iomem *addr = smmu->regbase + offs;
 349
 350         BUG_ON(!smmu_valid_reg(smmu, addr));
 351
 352         return readl(addr);
 353 }
 354
 355 static inline void smmu_write(struct smmu_device *smmu, u32 val, size_t offs)
 356 {
 357         void __iomem *addr = smmu->regbase + offs;
 358
 359         BUG_ON(!smmu_valid_reg(smmu, addr));
 360
 361         writel(val, addr);
 362 }
 363
 364 #define VA_PAGE_TO_PA(va, page) \
 365         (page_to_phys(page) + ((unsigned long)(va) & ~PAGE_MASK))
 366
 367 #define FLUSH_CPU_DCACHE(va, page, size)        \
 368         do {    \
 369                 unsigned long _pa_ = VA_PAGE_TO_PA(va, page);           \
 370                 __cpuc_flush_dcache_area((void *)(va), (size_t)(size)); \
 371                 outer_flush_range(_pa_, _pa_+(size_t)(size));           \
 372         } while (0)
 373
 374 /*
 375  * Any interaction between any block on PPSB and a block on APB or AHB
 376  * must have these read-back barriers to ensure the APB/AHB bus
 377  * transaction is complete before initiating activity on the PPSB
 378  * block.
 379  */
 380 #define FLUSH_SMMU_REGS(smmu)   smmu_read(smmu, SMMU_CONFIG)
 381
 382 #define smmu_client_hwgrp(c) (u32)((c)->dev->platform_data)
 383
 384 static int __smmu_client_set_hwgrp(struct smmu_client *c,
 385                                    unsigned long map, int on)
 386 {
 387         int i;
 388         struct smmu_as *as = c->as;
 389         u32 val, offs, mask = SMMU_ASID_ENABLE(as->asid);
 390         struct smmu_device *smmu = as->smmu;
 391
 392         WARN_ON(!on && map);
 393         if (on && !map)
 394                 return -EINVAL;
 395         if (!on)
 396                 map = smmu_client_hwgrp(c);
 397
 398         for_each_set_bit(i, &map, HWGRP_COUNT) {
 399                 offs = HWGRP_ASID_REG(i);
 400                 val = smmu_read(smmu, offs);
 401                 if (on) {
 402                         if (WARN_ON(val & mask))
 403                                 goto err_hw_busy;
 404                         val |= mask;
 405                 } else {
 406                         WARN_ON((val & mask) == mask);
 407                         val &= ~mask;
 408                 }
 409                 smmu_write(smmu, val, offs);
 410         }
 411         FLUSH_SMMU_REGS(smmu);
 412         c->hwgrp = map;
 413         return 0;
 414
 415 err_hw_busy:
 416         for_each_set_bit(i, &map, HWGRP_COUNT) {
 417                 offs = HWGRP_ASID_REG(i);
 418                 val = smmu_read(smmu, offs);
 419                 val &= ~mask;
 420                 smmu_write(smmu, val, offs);
 421         }
 422         return -EBUSY;
 423 }
 424
 425 static int smmu_client_set_hwgrp(struct smmu_client *c, u32 map, int on)
 426 {
 427         u32 val;
 428         unsigned long flags;
 429         struct smmu_as *as = c->as;
 430         struct smmu_device *smmu = as->smmu;
 431
 432         spin_lock_irqsave(&smmu->lock, flags);
 433         val = __smmu_client_set_hwgrp(c, map, on);
 434         spin_unlock_irqrestore(&smmu->lock, flags);
 435         return val;
 436 }
 437
 438 /*
 439  * Flush all TLB entries and all PTC entries
 440  * Caller must lock smmu
 441  */
 442 static void smmu_flush_regs(struct smmu_device *smmu, int enable)
 443 {
 444         u32 val;
 445
 446         smmu_write(smmu, SMMU_PTC_FLUSH_TYPE_ALL, SMMU_PTC_FLUSH);
 447         FLUSH_SMMU_REGS(smmu);
 448         val = SMMU_TLB_FLUSH_VA_MATCH_ALL |
 449                 SMMU_TLB_FLUSH_ASID_MATCH_disable;
 450         smmu_write(smmu, val, SMMU_TLB_FLUSH);
 451
 452         if (enable)
 453                 smmu_write(smmu, SMMU_CONFIG_ENABLE, SMMU_CONFIG);
 454         FLUSH_SMMU_REGS(smmu);
 455 }
 456
 457 static int smmu_setup_regs(struct smmu_device *smmu)
 458 {
 459         int i;
 460         u32 val;
 461
 462         for (i = 0; i < smmu->num_as; i++) {
 463                 struct smmu_as *as = &smmu->as[i];
 464                 struct smmu_client *c;
 465
 466                 smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID);
 467                 val = as->pdir_page ?
 468                         SMMU_MK_PDIR(as->pdir_page, as->pdir_attr) :
 469                         SMMU_PTB_DATA_RESET_VAL;
 470                 smmu_write(smmu, val, SMMU_PTB_DATA);
 471
 472                 list_for_each_entry(c, &as->client, list)
 473                         __smmu_client_set_hwgrp(c, c->hwgrp, 1);
 474         }
 475
 476         smmu_write(smmu, smmu->translation_enable_0, SMMU_TRANSLATION_ENABLE_0);
 477         smmu_write(smmu, smmu->translation_enable_1, SMMU_TRANSLATION_ENABLE_1);
 478         smmu_write(smmu, smmu->translation_enable_2, SMMU_TRANSLATION_ENABLE_2);
 479         smmu_write(smmu, smmu->asid_security, SMMU_ASID_SECURITY);
 480         smmu_write(smmu, SMMU_TLB_CONFIG_RESET_VAL, SMMU_CACHE_CONFIG(_TLB));
 481         smmu_write(smmu, SMMU_PTC_CONFIG_RESET_VAL, SMMU_CACHE_CONFIG(_PTC));
 482
 483         smmu_flush_regs(smmu, 1);
 484
 485         return tegra_ahb_enable_smmu(smmu->ahb);
 486 }
 487
 488 static void flush_ptc_and_tlb(struct smmu_device *smmu,
 489                       struct smmu_as *as, dma_addr_t iova,
 490                       unsigned long *pte, struct page *page, int is_pde)
 491 {
 492         u32 val;
 493         unsigned long tlb_flush_va = is_pde
 494                 ?  SMMU_TLB_FLUSH_VA(iova, SECTION)
 495                 :  SMMU_TLB_FLUSH_VA(iova, GROUP);
 496
 497         val = SMMU_PTC_FLUSH_TYPE_ADR | VA_PAGE_TO_PA(pte, page);
 498         smmu_write(smmu, val, SMMU_PTC_FLUSH);
 499         FLUSH_SMMU_REGS(smmu);
 500         val = tlb_flush_va |
 501                 SMMU_TLB_FLUSH_ASID_MATCH__ENABLE |
 502                 (as->asid << SMMU_TLB_FLUSH_ASID_SHIFT);
 503         smmu_write(smmu, val, SMMU_TLB_FLUSH);
 504         FLUSH_SMMU_REGS(smmu);
 505 }
 506
 507 static void free_ptbl(struct smmu_as *as, dma_addr_t iova)
 508 {
 509         unsigned long pdn = SMMU_ADDR_TO_PDN(iova);
 510         unsigned long *pdir = (unsigned long *)page_address(as->pdir_page);
 511
 512         if (pdir[pdn] != _PDE_VACANT(pdn)) {
 513                 dev_dbg(as->smmu->dev, "pdn: %lx\n", pdn);
 514
 515                 ClearPageReserved(SMMU_EX_PTBL_PAGE(pdir[pdn]));
 516                 __free_page(SMMU_EX_PTBL_PAGE(pdir[pdn]));
 517                 pdir[pdn] = _PDE_VACANT(pdn);
 518                 FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]);
 519                 flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn],
 520                                   as->pdir_page, 1);
 521         }
 522 }
 523
 524 static void free_pdir(struct smmu_as *as)
 525 {
 526         unsigned addr;
 527         int count;
 528         struct device *dev = as->smmu->dev;
 529
 530         if (!as->pdir_page)
 531                 return;
 532
 533         addr = as->smmu->iovmm_base;
 534         count = as->smmu->page_count;
 535         while (count-- > 0) {
 536                 free_ptbl(as, addr);
 537                 addr += SMMU_PAGE_SIZE * SMMU_PTBL_COUNT;
 538         }
 539         ClearPageReserved(as->pdir_page);
 540         __free_page(as->pdir_page);
 541         as->pdir_page = NULL;
 542         devm_kfree(dev, as->pte_count);
 543         as->pte_count = NULL;
 544 }
 545
 546 /*
 547  * Maps PTBL for given iova and returns the PTE address
 548  * Caller must unmap the mapped PTBL returned in *ptbl_page_p
 549  */
 550 static unsigned long *locate_pte(struct smmu_as *as,
 551                                  dma_addr_t iova, bool allocate,
 552                                  struct page **ptbl_page_p,
 553                                  unsigned int **count)
 554 {
 555         unsigned long ptn = SMMU_ADDR_TO_PFN(iova);
 556         unsigned long pdn = SMMU_ADDR_TO_PDN(iova);
 557         unsigned long *pdir = page_address(as->pdir_page);
 558         unsigned long *ptbl;
 559
 560         if (pdir[pdn] != _PDE_VACANT(pdn)) {
 561                 /* Mapped entry table already exists */
 562                 *ptbl_page_p = SMMU_EX_PTBL_PAGE(pdir[pdn]);
 563                 ptbl = page_address(*ptbl_page_p);
 564         } else if (!allocate) {
 565                 return NULL;
 566         } else {
 567                 int pn;
 568                 unsigned long addr = SMMU_PDN_TO_ADDR(pdn);
 569
 570                 /* Vacant - allocate a new page table */
 571                 dev_dbg(as->smmu->dev, "New PTBL pdn: %lx\n", pdn);
 572
 573                 *ptbl_page_p = alloc_page(GFP_ATOMIC);
 574                 if (!*ptbl_page_p) {
 575                         dev_err(as->smmu->dev,
 576                                 "failed to allocate smmu_device page table\n");
 577                         return NULL;
 578                 }
 579                 SetPageReserved(*ptbl_page_p);
 580                 ptbl = (unsigned long *)page_address(*ptbl_page_p);
 581                 for (pn = 0; pn < SMMU_PTBL_COUNT;
 582                      pn++, addr += SMMU_PAGE_SIZE) {
 583                         ptbl[pn] = _PTE_VACANT(addr);
 584                 }
 585                 FLUSH_CPU_DCACHE(ptbl, *ptbl_page_p, SMMU_PTBL_SIZE);
 586                 pdir[pdn] = SMMU_MK_PDE(*ptbl_page_p,
 587                                         as->pde_attr | _PDE_NEXT);
 588                 FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]);
 589                 flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn],
 590                                   as->pdir_page, 1);
 591         }
 592         *count = &as->pte_count[pdn];
 593
 594         return &ptbl[ptn % SMMU_PTBL_COUNT];
 595 }
 596
 597 #ifdef CONFIG_SMMU_SIG_DEBUG
 598 static void put_signature(struct smmu_as *as,
 599                           dma_addr_t iova, unsigned long pfn)
 600 {
 601         struct page *page;
 602         unsigned long *vaddr;
 603
 604         page = pfn_to_page(pfn);
 605         vaddr = page_address(page);
 606         if (!vaddr)
 607                 return;
 608
 609         vaddr[0] = iova;
 610         vaddr[1] = pfn << PAGE_SHIFT;
 611         FLUSH_CPU_DCACHE(vaddr, page, sizeof(vaddr[0]) * 2);
 612 }
 613 #else
 614 static inline void put_signature(struct smmu_as *as,
 615                                  unsigned long addr, unsigned long pfn)
 616 {
 617 }
 618 #endif
 619
 620 /*
 621  * Caller must not hold as->lock
 622  */
 623 static int alloc_pdir(struct smmu_as *as)
 624 {
 625         unsigned long *pdir, flags;
 626         int pdn, err = 0;
 627         u32 val;
 628         struct smmu_device *smmu = as->smmu;
 629         struct page *page;
 630         unsigned int *cnt;
 631
 632         /*
 633          * do the allocation, then grab as->lock
 634          */
 635         cnt = devm_kzalloc(smmu->dev,
 636                            sizeof(cnt[0]) * SMMU_PDIR_COUNT,
 637                            GFP_KERNEL);
 638         page = alloc_page(GFP_KERNEL | __GFP_DMA);
 639
 640         spin_lock_irqsave(&as->lock, flags);
 641
 642         if (as->pdir_page) {
 643                 /* We raced, free the redundant */
 644                 err = -EAGAIN;
 645                 goto err_out;
 646         }
 647
 648         if (!page || !cnt) {
 649                 dev_err(smmu->dev, "failed to allocate at %s\n", __func__);
 650                 err = -ENOMEM;
 651                 goto err_out;
 652         }
 653
 654         as->pdir_page = page;
 655         as->pte_count = cnt;
 656
 657         SetPageReserved(as->pdir_page);
 658         pdir = page_address(as->pdir_page);
 659
 660         for (pdn = 0; pdn < SMMU_PDIR_COUNT; pdn++)
 661                 pdir[pdn] = _PDE_VACANT(pdn);
 662         FLUSH_CPU_DCACHE(pdir, as->pdir_page, SMMU_PDIR_SIZE);
 663         val = SMMU_PTC_FLUSH_TYPE_ADR | VA_PAGE_TO_PA(pdir, as->pdir_page);
 664         smmu_write(smmu, val, SMMU_PTC_FLUSH);
 665         FLUSH_SMMU_REGS(as->smmu);
 666         val = SMMU_TLB_FLUSH_VA_MATCH_ALL |
 667                 SMMU_TLB_FLUSH_ASID_MATCH__ENABLE |
 668                 (as->asid << SMMU_TLB_FLUSH_ASID_SHIFT);
 669         smmu_write(smmu, val, SMMU_TLB_FLUSH);
 670         FLUSH_SMMU_REGS(as->smmu);
 671
 672         spin_unlock_irqrestore(&as->lock, flags);
 673
 674         return 0;
 675
 676 err_out:
 677         spin_unlock_irqrestore(&as->lock, flags);
 678
 679         devm_kfree(smmu->dev, cnt);
 680         if (page)
 681                 __free_page(page);
 682         return err;
 683 }
 684
 685 static void __smmu_iommu_unmap(struct smmu_as *as, dma_addr_t iova)
 686 {
 687         unsigned long *pte;
 688         struct page *page;
 689         unsigned int *count;
 690
 691         pte = locate_pte(as, iova, false, &page, &count);
 692         if (WARN_ON(!pte))
 693                 return;
 694
 695         if (WARN_ON(*pte == _PTE_VACANT(iova)))
 696                 return;
 697
 698         *pte = _PTE_VACANT(iova);
 699         FLUSH_CPU_DCACHE(pte, page, sizeof(*pte));
 700         flush_ptc_and_tlb(as->smmu, as, iova, pte, page, 0);
 701         if (!--(*count))
 702                 free_ptbl(as, iova);
 703 }
 704
 705 static void __smmu_iommu_map_pfn(struct smmu_as *as, dma_addr_t iova,
 706                                  unsigned long pfn)
 707 {
 708         struct smmu_device *smmu = as->smmu;
 709         unsigned long *pte;
 710         unsigned int *count;
 711         struct page *page;
 712
 713         pte = locate_pte(as, iova, true, &page, &count);
 714         if (WARN_ON(!pte))
 715                 return;
 716
 717         if (*pte == _PTE_VACANT(iova))
 718                 (*count)++;
 719         *pte = SMMU_PFN_TO_PTE(pfn, as->pte_attr);
 720         if (unlikely((*pte == _PTE_VACANT(iova))))
 721                 (*count)--;
 722         FLUSH_CPU_DCACHE(pte, page, sizeof(*pte));
 723         flush_ptc_and_tlb(smmu, as, iova, pte, page, 0);
 724         put_signature(as, iova, pfn);
 725 }
 726
 727 static int smmu_iommu_map(struct iommu_domain *domain, unsigned long iova,
 728                           phys_addr_t pa, size_t bytes, int prot)
 729 {
 730         struct smmu_as *as = domain->priv;
 731         unsigned long pfn = __phys_to_pfn(pa);
 732         unsigned long flags;
 733
 734         dev_dbg(as->smmu->dev, "[%d] %08lx:%pa\n", as->asid, iova, &pa);
 735
 736         if (!pfn_valid(pfn))
 737                 return -ENOMEM;
 738
 739         spin_lock_irqsave(&as->lock, flags);
 740         __smmu_iommu_map_pfn(as, iova, pfn);
 741         spin_unlock_irqrestore(&as->lock, flags);
 742         return 0;
 743 }
 744
 745 static size_t smmu_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 746                                size_t bytes)
 747 {
 748         struct smmu_as *as = domain->priv;
 749         unsigned long flags;
 750
 751         dev_dbg(as->smmu->dev, "[%d] %08lx\n", as->asid, iova);
 752
 753         spin_lock_irqsave(&as->lock, flags);
 754         __smmu_iommu_unmap(as, iova);
 755         spin_unlock_irqrestore(&as->lock, flags);
 756         return SMMU_PAGE_SIZE;
 757 }
 758
 759 static phys_addr_t smmu_iommu_iova_to_phys(struct iommu_domain *domain,
 760                                            dma_addr_t iova)
 761 {
 762         struct smmu_as *as = domain->priv;
 763         unsigned long *pte;
 764         unsigned int *count;
 765         struct page *page;
 766         unsigned long pfn;
 767         unsigned long flags;
 768
 769         spin_lock_irqsave(&as->lock, flags);
 770
 771         pte = locate_pte(as, iova, true, &page, &count);
 772         pfn = *pte & SMMU_PFN_MASK;
 773         WARN_ON(!pfn_valid(pfn));
 774         dev_dbg(as->smmu->dev,
 775                 "iova:%08llx pfn:%08lx asid:%d\n", (unsigned long long)iova,
 776                  pfn, as->asid);
 777
 778         spin_unlock_irqrestore(&as->lock, flags);
 779         return PFN_PHYS(pfn);
 780 }
 781
 782 static int smmu_iommu_domain_has_cap(struct iommu_domain *domain,
 783                                      unsigned long cap)
 784 {
 785         return 0;
 786 }
 787
 788 static int smmu_iommu_attach_dev(struct iommu_domain *domain,
 789                                  struct device *dev)
 790 {
 791         struct smmu_as *as = domain->priv;
 792         struct smmu_device *smmu = as->smmu;
 793         struct smmu_client *client, *c;
 794         u32 map;
 795         int err;
 796
 797         client = devm_kzalloc(smmu->dev, sizeof(*c), GFP_KERNEL);
 798         if (!client)
 799                 return -ENOMEM;
 800         client->dev = dev;
 801         client->as = as;
 802         map = (unsigned long)dev->platform_data;
 803         if (!map)
 804                 return -EINVAL;
 805
 806         err = smmu_client_enable_hwgrp(client, map);
 807         if (err)
 808                 goto err_hwgrp;
 809
 810         spin_lock(&as->client_lock);
 811         list_for_each_entry(c, &as->client, list) {
 812                 if (c->dev == dev) {
 813                         dev_err(smmu->dev,
 814                                 "%s is already attached\n", dev_name(c->dev));
 815                         err = -EINVAL;
 816                         goto err_client;
 817                 }
 818         }
 819         list_add(&client->list, &as->client);
 820         spin_unlock(&as->client_lock);
 821
 822         /*
 823          * Reserve "page zero" for AVP vectors using a common dummy
 824          * page.
 825          */
 826         if (map & HWG_AVPC) {
 827                 struct page *page;
 828
 829                 page = as->smmu->avp_vector_page;
 830                 __smmu_iommu_map_pfn(as, 0, page_to_pfn(page));
 831
 832                 pr_info("Reserve \"page zero\" for AVP vectors using a common dummy\n");
 833         }
 834
 835         dev_dbg(smmu->dev, "%s is attached\n", dev_name(dev));
 836         return 0;
 837
 838 err_client:
 839         smmu_client_disable_hwgrp(client);
 840         spin_unlock(&as->client_lock);
 841 err_hwgrp:
 842         devm_kfree(smmu->dev, client);
 843         return err;
 844 }
 845
 846 static void smmu_iommu_detach_dev(struct iommu_domain *domain,
 847                                   struct device *dev)
 848 {
 849         struct smmu_as *as = domain->priv;
 850         struct smmu_device *smmu = as->smmu;
 851         struct smmu_client *c;
 852
 853         spin_lock(&as->client_lock);
 854
 855         list_for_each_entry(c, &as->client, list) {
 856                 if (c->dev == dev) {
 857                         smmu_client_disable_hwgrp(c);
 858                         list_del(&c->list);
 859                         devm_kfree(smmu->dev, c);
 860                         c->as = NULL;
 861                         dev_dbg(smmu->dev,
 862                                 "%s is detached\n", dev_name(c->dev));
 863                         goto out;
 864                 }
 865         }
 866         dev_err(smmu->dev, "Couldn't find %s\n", dev_name(dev));
 867 out:
 868         spin_unlock(&as->client_lock);
 869 }
 870
 871 static int smmu_iommu_domain_init(struct iommu_domain *domain)
 872 {
 873         int i, err = -EAGAIN;
 874         unsigned long flags;
 875         struct smmu_as *as;
 876         struct smmu_device *smmu = smmu_handle;
 877
 878         /* Look for a free AS with lock held */
 879         for  (i = 0; i < smmu->num_as; i++) {
 880                 as = &smmu->as[i];
 881
 882                 if (as->pdir_page)
 883                         continue;
 884
 885                 err = alloc_pdir(as);
 886                 if (!err)
 887                         goto found;
 888
 889                 if (err != -EAGAIN)
 890                         break;
 891         }
 892         if (i == smmu->num_as)
 893                 dev_err(smmu->dev,  "no free AS\n");
 894         return err;
 895
 896 found:
 897         spin_lock_irqsave(&smmu->lock, flags);
 898
 899         /* Update PDIR register */
 900         smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID);
 901         smmu_write(smmu,
 902                    SMMU_MK_PDIR(as->pdir_page, as->pdir_attr), SMMU_PTB_DATA);
 903         FLUSH_SMMU_REGS(smmu);
 904
 905         spin_unlock_irqrestore(&smmu->lock, flags);
 906
 907         domain->priv = as;
 908
 909         domain->geometry.aperture_start = smmu->iovmm_base;
 910         domain->geometry.aperture_end   = smmu->iovmm_base +
 911                 smmu->page_count * SMMU_PAGE_SIZE - 1;
 912         domain->geometry.force_aperture = true;
 913
 914         dev_dbg(smmu->dev, "smmu_as@%p\n", as);
 915
 916         return 0;
 917 }
 918
 919 static void smmu_iommu_domain_destroy(struct iommu_domain *domain)
 920 {
 921         struct smmu_as *as = domain->priv;
 922         struct smmu_device *smmu = as->smmu;
 923         unsigned long flags;
 924
 925         spin_lock_irqsave(&as->lock, flags);
 926
 927         if (as->pdir_page) {
 928                 spin_lock(&smmu->lock);
 929                 smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID);
 930                 smmu_write(smmu, SMMU_PTB_DATA_RESET_VAL, SMMU_PTB_DATA);
 931                 FLUSH_SMMU_REGS(smmu);
 932                 spin_unlock(&smmu->lock);
 933
 934                 free_pdir(as);
 935         }
 936
 937         if (!list_empty(&as->client)) {
 938                 struct smmu_client *c;
 939
 940                 list_for_each_entry(c, &as->client, list)
 941                         smmu_iommu_detach_dev(domain, c->dev);
 942         }
 943
 944         spin_unlock_irqrestore(&as->lock, flags);
 945
 946         domain->priv = NULL;
 947         dev_dbg(smmu->dev, "smmu_as@%p\n", as);
 948 }
 949
 950 static struct iommu_ops smmu_iommu_ops = {
 951         .domain_init    = smmu_iommu_domain_init,
 952         .domain_destroy = smmu_iommu_domain_destroy,
 953         .attach_dev     = smmu_iommu_attach_dev,
 954         .detach_dev     = smmu_iommu_detach_dev,
 955         .map            = smmu_iommu_map,
 956         .unmap          = smmu_iommu_unmap,
 957         .iova_to_phys   = smmu_iommu_iova_to_phys,
 958         .domain_has_cap = smmu_iommu_domain_has_cap,
 959         .pgsize_bitmap  = SMMU_IOMMU_PGSIZES,
 960 };
 961
 962 /* Should be in the order of enum */
 963 static const char * const smmu_debugfs_mc[] = { "mc", };
 964 static const char * const smmu_debugfs_cache[] = {  "tlb", "ptc", };
 965
 966 static ssize_t smmu_debugfs_stats_write(struct file *file,
 967                                         const char __user *buffer,
 968                                         size_t count, loff_t *pos)
 969 {
 970         struct smmu_debugfs_info *info;
 971         struct smmu_device *smmu;
 972         int i;
 973         enum {
 974                 _OFF = 0,
 975                 _ON,
 976                 _RESET,
 977         };
 978         const char * const command[] = {
 979                 [_OFF]          = "off",
 980                 [_ON]           = "on",
 981                 [_RESET]        = "reset",
 982         };
 983         char str[] = "reset";
 984         u32 val;
 985         size_t offs;
 986
 987         count = min_t(size_t, count, sizeof(str));
 988         if (copy_from_user(str, buffer, count))
 989                 return -EINVAL;
 990
 991         for (i = 0; i < ARRAY_SIZE(command); i++)
 992                 if (strncmp(str, command[i],
 993                             strlen(command[i])) == 0)
 994                         break;
 995
 996         if (i == ARRAY_SIZE(command))
 997                 return -EINVAL;
 998
 999         info = file_inode(file)->i_private;
1000         smmu = info->smmu;
1001
1002         offs = SMMU_CACHE_CONFIG(info->cache);
1003         val = smmu_read(smmu, offs);
1004         switch (i) {
1005         case _OFF:
1006                 val &= ~SMMU_CACHE_CONFIG_STATS_ENABLE;
1007                 val &= ~SMMU_CACHE_CONFIG_STATS_TEST;
1008                 smmu_write(smmu, val, offs);
1009                 break;
1010         case _ON:
1011                 val |= SMMU_CACHE_CONFIG_STATS_ENABLE;
1012                 val &= ~SMMU_CACHE_CONFIG_STATS_TEST;
1013                 smmu_write(smmu, val, offs);
1014                 break;
1015         case _RESET:
1016                 val |= SMMU_CACHE_CONFIG_STATS_TEST;
1017                 smmu_write(smmu, val, offs);
1018                 val &= ~SMMU_CACHE_CONFIG_STATS_TEST;
1019                 smmu_write(smmu, val, offs);
1020                 break;
1021         default:
1022                 BUG();
1023                 break;
1024         }
1025
1026         dev_dbg(smmu->dev, "%s() %08x, %08x @%08x\n", __func__,
1027                 val, smmu_read(smmu, offs), offs);
1028
1029         return count;
1030 }
1031
1032 static int smmu_debugfs_stats_show(struct seq_file *s, void *v)
1033 {
1034         struct smmu_debugfs_info *info = s->private;
1035         struct smmu_device *smmu = info->smmu;
1036         int i;
1037         const char * const stats[] = { "hit", "miss", };
1038
1039
1040         for (i = 0; i < ARRAY_SIZE(stats); i++) {
1041                 u32 val;
1042                 size_t offs;
1043
1044                 offs = SMMU_STATS_CACHE_COUNT(info->mc, info->cache, i);
1045                 val = smmu_read(smmu, offs);
1046                 seq_printf(s, "%s:%08x ", stats[i], val);
1047
1048                 dev_dbg(smmu->dev, "%s() %s %08x @%08x\n", __func__,
1049                         stats[i], val, offs);
1050         }
1051         seq_printf(s, "\n");
1052         return 0;
1053 }
1054
1055 static int smmu_debugfs_stats_open(struct inode *inode, struct file *file)
1056 {
1057         return single_open(file, smmu_debugfs_stats_show, inode->i_private);
1058 }
1059
1060 static const struct file_operations smmu_debugfs_stats_fops = {
1061         .open           = smmu_debugfs_stats_open,
1062         .read           = seq_read,
1063         .llseek         = seq_lseek,
1064         .release        = single_release,
1065         .write          = smmu_debugfs_stats_write,
1066 };
1067
1068 static void smmu_debugfs_delete(struct smmu_device *smmu)
1069 {
1070         debugfs_remove_recursive(smmu->debugfs_root);
1071         kfree(smmu->debugfs_info);
1072 }
1073
1074 static void smmu_debugfs_create(struct smmu_device *smmu)
1075 {
1076         int i;
1077         size_t bytes;
1078         struct dentry *root;
1079
1080         bytes = ARRAY_SIZE(smmu_debugfs_mc) * ARRAY_SIZE(smmu_debugfs_cache) *
1081                 sizeof(*smmu->debugfs_info);
1082         smmu->debugfs_info = kmalloc(bytes, GFP_KERNEL);
1083         if (!smmu->debugfs_info)
1084                 return;
1085
1086         root = debugfs_create_dir(dev_name(smmu->dev), NULL);
1087         if (!root)
1088                 goto err_out;
1089         smmu->debugfs_root = root;
1090
1091         for (i = 0; i < ARRAY_SIZE(smmu_debugfs_mc); i++) {
1092                 int j;
1093                 struct dentry *mc;
1094
1095                 mc = debugfs_create_dir(smmu_debugfs_mc[i], root);
1096                 if (!mc)
1097                         goto err_out;
1098
1099                 for (j = 0; j < ARRAY_SIZE(smmu_debugfs_cache); j++) {
1100                         struct dentry *cache;
1101                         struct smmu_debugfs_info *info;
1102
1103                         info = smmu->debugfs_info;
1104                         info += i * ARRAY_SIZE(smmu_debugfs_mc) + j;
1105                         info->smmu = smmu;
1106                         info->mc = i;
1107                         info->cache = j;
1108
1109                         cache = debugfs_create_file(smmu_debugfs_cache[j],
1110                                                     S_IWUGO | S_IRUGO, mc,
1111                                                     (void *)info,
1112                                                     &smmu_debugfs_stats_fops);
1113                         if (!cache)
1114                                 goto err_out;
1115                 }
1116         }
1117
1118         return;
1119
1120 err_out:
1121         smmu_debugfs_delete(smmu);
1122 }
1123
1124 static int tegra_smmu_suspend(struct device *dev)
1125 {
1126         struct smmu_device *smmu = dev_get_drvdata(dev);
1127
1128         smmu->translation_enable_0 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_0);
1129         smmu->translation_enable_1 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_1);
1130         smmu->translation_enable_2 = smmu_read(smmu, SMMU_TRANSLATION_ENABLE_2);
1131         smmu->asid_security = smmu_read(smmu, SMMU_ASID_SECURITY);
1132         return 0;
1133 }
1134
1135 static int tegra_smmu_resume(struct device *dev)
1136 {
1137         struct smmu_device *smmu = dev_get_drvdata(dev);
1138         unsigned long flags;
1139         int err;
1140
1141         spin_lock_irqsave(&smmu->lock, flags);
1142         err = smmu_setup_regs(smmu);
1143         spin_unlock_irqrestore(&smmu->lock, flags);
1144         return err;
1145 }
1146
1147 static int tegra_smmu_probe(struct platform_device *pdev)
1148 {
1149         struct smmu_device *smmu;
1150         struct device *dev = &pdev->dev;
1151         int i, asids, err = 0;
1152         dma_addr_t uninitialized_var(base);
1153         size_t bytes, uninitialized_var(size);
1154
1155         if (smmu_handle)
1156                 return -EIO;
1157
1158         BUILD_BUG_ON(PAGE_SHIFT != SMMU_PAGE_SHIFT);
1159
1160         if (of_property_read_u32(dev->of_node, "nvidia,#asids", &asids))
1161                 return -ENODEV;
1162
1163         bytes = sizeof(*smmu) + asids * sizeof(*smmu->as);
1164         smmu = devm_kzalloc(dev, bytes, GFP_KERNEL);
1165         if (!smmu) {
1166                 dev_err(dev, "failed to allocate smmu_device\n");
1167                 return -ENOMEM;
1168         }
1169
1170         smmu->nregs = pdev->num_resources;
1171         smmu->regs = devm_kzalloc(dev, 2 * smmu->nregs * sizeof(*smmu->regs),
1172                                   GFP_KERNEL);
1173         smmu->rege = smmu->regs + smmu->nregs;
1174         if (!smmu->regs)
1175                 return -ENOMEM;
1176         for (i = 0; i < smmu->nregs; i++) {
1177                 struct resource *res;
1178
1179                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
1180                 smmu->regs[i] = devm_ioremap_resource(&pdev->dev, res);
1181                 if (IS_ERR(smmu->regs[i]))
1182                         return PTR_ERR(smmu->regs[i]);
1183                 smmu->rege[i] = smmu->regs[i] + resource_size(res) - 1;
1184         }
1185         /* Same as "mc" 1st regiter block start address */
1186         smmu->regbase = (void __iomem *)((u32)smmu->regs[0] & PAGE_MASK);
1187
1188         err = of_get_dma_window(dev->of_node, NULL, 0, NULL, &base, &size);
1189         if (err)
1190                 return -ENODEV;
1191
1192         if (size & SMMU_PAGE_MASK)
1193                 return -EINVAL;
1194
1195         size >>= SMMU_PAGE_SHIFT;
1196         if (!size)
1197                 return -EINVAL;
1198
1199         smmu->ahb = of_parse_phandle(dev->of_node, "nvidia,ahb", 0);
1200         if (!smmu->ahb)
1201                 return -ENODEV;
1202
1203         smmu->dev = dev;
1204         smmu->num_as = asids;
1205         smmu->iovmm_base = base;
1206         smmu->page_count = size;
1207
1208         smmu->translation_enable_0 = ~0;
1209         smmu->translation_enable_1 = ~0;
1210         smmu->translation_enable_2 = ~0;
1211         smmu->asid_security = 0;
1212
1213         for (i = 0; i < smmu->num_as; i++) {
1214                 struct smmu_as *as = &smmu->as[i];
1215
1216                 as->smmu = smmu;
1217                 as->asid = i;
1218                 as->pdir_attr = _PDIR_ATTR;
1219                 as->pde_attr = _PDE_ATTR;
1220                 as->pte_attr = _PTE_ATTR;
1221
1222                 spin_lock_init(&as->lock);
1223                 spin_lock_init(&as->client_lock);
1224                 INIT_LIST_HEAD(&as->client);
1225         }
1226         spin_lock_init(&smmu->lock);
1227         err = smmu_setup_regs(smmu);
1228         if (err)
1229                 return err;
1230         platform_set_drvdata(pdev, smmu);
1231
1232         smmu->avp_vector_page = alloc_page(GFP_KERNEL);
1233         if (!smmu->avp_vector_page)
1234                 return -ENOMEM;
1235
1236         smmu_debugfs_create(smmu);
1237         smmu_handle = smmu;
1238         bus_set_iommu(&platform_bus_type, &smmu_iommu_ops);
1239         return 0;
1240 }
1241
1242 static int tegra_smmu_remove(struct platform_device *pdev)
1243 {
1244         struct smmu_device *smmu = platform_get_drvdata(pdev);
1245         int i;
1246
1247         smmu_debugfs_delete(smmu);
1248
1249         smmu_write(smmu, SMMU_CONFIG_DISABLE, SMMU_CONFIG);
1250         for (i = 0; i < smmu->num_as; i++)
1251                 free_pdir(&smmu->as[i]);
1252         __free_page(smmu->avp_vector_page);
1253         smmu_handle = NULL;
1254         return 0;
1255 }
1256
1257 static const struct dev_pm_ops tegra_smmu_pm_ops = {
1258         .suspend        = tegra_smmu_suspend,
1259         .resume         = tegra_smmu_resume,
1260 };
1261
1262 static struct of_device_id tegra_smmu_of_match[] = {
1263         { .compatible = "nvidia,tegra30-smmu", },
1264         { },
1265 };
1266 MODULE_DEVICE_TABLE(of, tegra_smmu_of_match);
1267
1268 static struct platform_driver tegra_smmu_driver = {
1269         .probe          = tegra_smmu_probe,
1270         .remove         = tegra_smmu_remove,
1271         .driver = {
1272                 .owner  = THIS_MODULE,
1273                 .name   = "tegra-smmu",
1274                 .pm     = &tegra_smmu_pm_ops,
1275                 .of_match_table = tegra_smmu_of_match,
1276         },
1277 };
1278
1279 static int tegra_smmu_init(void)
1280 {
1281         return platform_driver_register(&tegra_smmu_driver);
1282 }
1283
1284 static void __exit tegra_smmu_exit(void)
1285 {
1286         platform_driver_unregister(&tegra_smmu_driver);
1287 }
1288
1289 subsys_initcall(tegra_smmu_init);
1290 module_exit(tegra_smmu_exit);
1291
1292 MODULE_DESCRIPTION("IOMMU API for SMMU in Tegra30");
1293 MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
1294 MODULE_ALIAS("platform:tegra-smmu");
1295 MODULE_LICENSE("GPL v2");