drivers/iommu/exynos-iommu.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2011,2016 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  */
   6
   7 #ifdef CONFIG_EXYNOS_IOMMU_DEBUG
   8 #define DEBUG
   9 #endif
  10
  11 #include <linux/clk.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/err.h>
  14 #include <linux/io.h>
  15 #include <linux/iommu.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/kmemleak.h>
  18 #include <linux/list.h>
  19 #include <linux/of.h>
  20 #include <linux/of_platform.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/slab.h>
  24
  25 typedef u32 sysmmu_iova_t;
  26 typedef u32 sysmmu_pte_t;
  27
  28 /* We do not consider super section mapping (16MB) */
  29 #define SECT_ORDER 20
  30 #define LPAGE_ORDER 16
  31 #define SPAGE_ORDER 12
  32
  33 #define SECT_SIZE (1 << SECT_ORDER)
  34 #define LPAGE_SIZE (1 << LPAGE_ORDER)
  35 #define SPAGE_SIZE (1 << SPAGE_ORDER)
  36
  37 #define SECT_MASK (~(SECT_SIZE - 1))
  38 #define LPAGE_MASK (~(LPAGE_SIZE - 1))
  39 #define SPAGE_MASK (~(SPAGE_SIZE - 1))
  40
  41 #define lv1ent_fault(sent) ((*(sent) == ZERO_LV2LINK) || \
  42                            ((*(sent) & 3) == 0) || ((*(sent) & 3) == 3))
  43 #define lv1ent_zero(sent) (*(sent) == ZERO_LV2LINK)
  44 #define lv1ent_page_zero(sent) ((*(sent) & 3) == 1)
  45 #define lv1ent_page(sent) ((*(sent) != ZERO_LV2LINK) && \
  46                           ((*(sent) & 3) == 1))
  47 #define lv1ent_section(sent) ((*(sent) & 3) == 2)
  48
  49 #define lv2ent_fault(pent) ((*(pent) & 3) == 0)
  50 #define lv2ent_small(pent) ((*(pent) & 2) == 2)
  51 #define lv2ent_large(pent) ((*(pent) & 3) == 1)
  52
  53 /*
  54  * v1.x - v3.x SYSMMU supports 32bit physical and 32bit virtual address spaces
  55  * v5.0 introduced support for 36bit physical address space by shifting
  56  * all page entry values by 4 bits.
  57  * All SYSMMU controllers in the system support the address spaces of the same
  58  * size, so PG_ENT_SHIFT can be initialized on first SYSMMU probe to proper
  59  * value (0 or 4).
  60  */
  61 static short PG_ENT_SHIFT = -1;
  62 #define SYSMMU_PG_ENT_SHIFT 0
  63 #define SYSMMU_V5_PG_ENT_SHIFT 4
  64
  65 static const sysmmu_pte_t *LV1_PROT;
  66 static const sysmmu_pte_t SYSMMU_LV1_PROT[] = {
  67         ((0 << 15) | (0 << 10)), /* no access */
  68         ((1 << 15) | (1 << 10)), /* IOMMU_READ only */
  69         ((0 << 15) | (1 << 10)), /* IOMMU_WRITE not supported, use read/write */
  70         ((0 << 15) | (1 << 10)), /* IOMMU_READ | IOMMU_WRITE */
  71 };
  72 static const sysmmu_pte_t SYSMMU_V5_LV1_PROT[] = {
  73         (0 << 4), /* no access */
  74         (1 << 4), /* IOMMU_READ only */
  75         (2 << 4), /* IOMMU_WRITE only */
  76         (3 << 4), /* IOMMU_READ | IOMMU_WRITE */
  77 };
  78
  79 static const sysmmu_pte_t *LV2_PROT;
  80 static const sysmmu_pte_t SYSMMU_LV2_PROT[] = {
  81         ((0 << 9) | (0 << 4)), /* no access */
  82         ((1 << 9) | (1 << 4)), /* IOMMU_READ only */
  83         ((0 << 9) | (1 << 4)), /* IOMMU_WRITE not supported, use read/write */
  84         ((0 << 9) | (1 << 4)), /* IOMMU_READ | IOMMU_WRITE */
  85 };
  86 static const sysmmu_pte_t SYSMMU_V5_LV2_PROT[] = {
  87         (0 << 2), /* no access */
  88         (1 << 2), /* IOMMU_READ only */
  89         (2 << 2), /* IOMMU_WRITE only */
  90         (3 << 2), /* IOMMU_READ | IOMMU_WRITE */
  91 };
  92
  93 #define SYSMMU_SUPPORTED_PROT_BITS (IOMMU_READ | IOMMU_WRITE)
  94
  95 #define sect_to_phys(ent) (((phys_addr_t) ent) << PG_ENT_SHIFT)
  96 #define section_phys(sent) (sect_to_phys(*(sent)) & SECT_MASK)
  97 #define section_offs(iova) (iova & (SECT_SIZE - 1))
  98 #define lpage_phys(pent) (sect_to_phys(*(pent)) & LPAGE_MASK)
  99 #define lpage_offs(iova) (iova & (LPAGE_SIZE - 1))
 100 #define spage_phys(pent) (sect_to_phys(*(pent)) & SPAGE_MASK)
 101 #define spage_offs(iova) (iova & (SPAGE_SIZE - 1))
 102
 103 #define NUM_LV1ENTRIES 4096
 104 #define NUM_LV2ENTRIES (SECT_SIZE / SPAGE_SIZE)
 105
 106 static u32 lv1ent_offset(sysmmu_iova_t iova)
 107 {
 108         return iova >> SECT_ORDER;
 109 }
 110
 111 static u32 lv2ent_offset(sysmmu_iova_t iova)
 112 {
 113         return (iova >> SPAGE_ORDER) & (NUM_LV2ENTRIES - 1);
 114 }
 115
 116 #define LV1TABLE_SIZE (NUM_LV1ENTRIES * sizeof(sysmmu_pte_t))
 117 #define LV2TABLE_SIZE (NUM_LV2ENTRIES * sizeof(sysmmu_pte_t))
 118
 119 #define SPAGES_PER_LPAGE (LPAGE_SIZE / SPAGE_SIZE)
 120 #define lv2table_base(sent) (sect_to_phys(*(sent) & 0xFFFFFFC0))
 121
 122 #define mk_lv1ent_sect(pa, prot) ((pa >> PG_ENT_SHIFT) | LV1_PROT[prot] | 2)
 123 #define mk_lv1ent_page(pa) ((pa >> PG_ENT_SHIFT) | 1)
 124 #define mk_lv2ent_lpage(pa, prot) ((pa >> PG_ENT_SHIFT) | LV2_PROT[prot] | 1)
 125 #define mk_lv2ent_spage(pa, prot) ((pa >> PG_ENT_SHIFT) | LV2_PROT[prot] | 2)
 126
 127 #define CTRL_ENABLE     0x5
 128 #define CTRL_BLOCK      0x7
 129 #define CTRL_DISABLE    0x0
 130
 131 #define CFG_LRU         0x1
 132 #define CFG_EAP         (1 << 2)
 133 #define CFG_QOS(n)      ((n & 0xF) << 7)
 134 #define CFG_ACGEN       (1 << 24) /* System MMU 3.3 only */
 135 #define CFG_SYSSEL      (1 << 22) /* System MMU 3.2 only */
 136 #define CFG_FLPDCACHE   (1 << 20) /* System MMU 3.2+ only */
 137
 138 #define CTRL_VM_ENABLE                  BIT(0)
 139 #define CTRL_VM_FAULT_MODE_STALL        BIT(3)
 140 #define CAPA0_CAPA1_EXIST               BIT(11)
 141 #define CAPA1_VCR_ENABLED               BIT(14)
 142
 143 /* common registers */
 144 #define REG_MMU_CTRL            0x000
 145 #define REG_MMU_CFG             0x004
 146 #define REG_MMU_STATUS          0x008
 147 #define REG_MMU_VERSION         0x034
 148
 149 #define MMU_MAJ_VER(val)        ((val) >> 7)
 150 #define MMU_MIN_VER(val)        ((val) & 0x7F)
 151 #define MMU_RAW_VER(reg)        (((reg) >> 21) & ((1 << 11) - 1)) /* 11 bits */
 152
 153 #define MAKE_MMU_VER(maj, min)  ((((maj) & 0xF) << 7) | ((min) & 0x7F))
 154
 155 /* v1.x - v3.x registers */
 156 #define REG_PAGE_FAULT_ADDR     0x024
 157 #define REG_AW_FAULT_ADDR       0x028
 158 #define REG_AR_FAULT_ADDR       0x02C
 159 #define REG_DEFAULT_SLAVE_ADDR  0x030
 160
 161 /* v5.x registers */
 162 #define REG_V5_FAULT_AR_VA      0x070
 163 #define REG_V5_FAULT_AW_VA      0x080
 164
 165 /* v7.x registers */
 166 #define REG_V7_CAPA0            0x870
 167 #define REG_V7_CAPA1            0x874
 168 #define REG_V7_CTRL_VM          0x8000
 169
 170 #define has_sysmmu(dev)         (dev_iommu_priv_get(dev) != NULL)
 171
 172 static struct device *dma_dev;
 173 static struct kmem_cache *lv2table_kmem_cache;
 174 static sysmmu_pte_t *zero_lv2_table;
 175 #define ZERO_LV2LINK mk_lv1ent_page(virt_to_phys(zero_lv2_table))
 176
 177 static sysmmu_pte_t *section_entry(sysmmu_pte_t *pgtable, sysmmu_iova_t iova)
 178 {
 179         return pgtable + lv1ent_offset(iova);
 180 }
 181
 182 static sysmmu_pte_t *page_entry(sysmmu_pte_t *sent, sysmmu_iova_t iova)
 183 {
 184         return (sysmmu_pte_t *)phys_to_virt(
 185                                 lv2table_base(sent)) + lv2ent_offset(iova);
 186 }
 187
 188 /*
 189  * IOMMU fault information register
 190  */
 191 struct sysmmu_fault_info {
 192         unsigned int bit;       /* bit number in STATUS register */
 193         unsigned short addr_reg; /* register to read VA fault address */
 194         const char *name;       /* human readable fault name */
 195         unsigned int type;      /* fault type for report_iommu_fault */
 196 };
 197
 198 static const struct sysmmu_fault_info sysmmu_faults[] = {
 199         { 0, REG_PAGE_FAULT_ADDR, "PAGE", IOMMU_FAULT_READ },
 200         { 1, REG_AR_FAULT_ADDR, "AR MULTI-HIT", IOMMU_FAULT_READ },
 201         { 2, REG_AW_FAULT_ADDR, "AW MULTI-HIT", IOMMU_FAULT_WRITE },
 202         { 3, REG_DEFAULT_SLAVE_ADDR, "BUS ERROR", IOMMU_FAULT_READ },
 203         { 4, REG_AR_FAULT_ADDR, "AR SECURITY PROTECTION", IOMMU_FAULT_READ },
 204         { 5, REG_AR_FAULT_ADDR, "AR ACCESS PROTECTION", IOMMU_FAULT_READ },
 205         { 6, REG_AW_FAULT_ADDR, "AW SECURITY PROTECTION", IOMMU_FAULT_WRITE },
 206         { 7, REG_AW_FAULT_ADDR, "AW ACCESS PROTECTION", IOMMU_FAULT_WRITE },
 207 };
 208
 209 static const struct sysmmu_fault_info sysmmu_v5_faults[] = {
 210         { 0, REG_V5_FAULT_AR_VA, "AR PTW", IOMMU_FAULT_READ },
 211         { 1, REG_V5_FAULT_AR_VA, "AR PAGE", IOMMU_FAULT_READ },
 212         { 2, REG_V5_FAULT_AR_VA, "AR MULTI-HIT", IOMMU_FAULT_READ },
 213         { 3, REG_V5_FAULT_AR_VA, "AR ACCESS PROTECTION", IOMMU_FAULT_READ },
 214         { 4, REG_V5_FAULT_AR_VA, "AR SECURITY PROTECTION", IOMMU_FAULT_READ },
 215         { 16, REG_V5_FAULT_AW_VA, "AW PTW", IOMMU_FAULT_WRITE },
 216         { 17, REG_V5_FAULT_AW_VA, "AW PAGE", IOMMU_FAULT_WRITE },
 217         { 18, REG_V5_FAULT_AW_VA, "AW MULTI-HIT", IOMMU_FAULT_WRITE },
 218         { 19, REG_V5_FAULT_AW_VA, "AW ACCESS PROTECTION", IOMMU_FAULT_WRITE },
 219         { 20, REG_V5_FAULT_AW_VA, "AW SECURITY PROTECTION", IOMMU_FAULT_WRITE },
 220 };
 221
 222 /*
 223  * This structure is attached to dev->iommu->priv of the master device
 224  * on device add, contains a list of SYSMMU controllers defined by device tree,
 225  * which are bound to given master device. It is usually referenced by 'owner'
 226  * pointer.
 227 */
 228 struct exynos_iommu_owner {
 229         struct list_head controllers;   /* list of sysmmu_drvdata.owner_node */
 230         struct iommu_domain *domain;    /* domain this device is attached */
 231         struct mutex rpm_lock;          /* for runtime pm of all sysmmus */
 232 };
 233
 234 /*
 235  * This structure exynos specific generalization of struct iommu_domain.
 236  * It contains list of SYSMMU controllers from all master devices, which has
 237  * been attached to this domain and page tables of IO address space defined by
 238  * it. It is usually referenced by 'domain' pointer.
 239  */
 240 struct exynos_iommu_domain {
 241         struct list_head clients; /* list of sysmmu_drvdata.domain_node */
 242         sysmmu_pte_t *pgtable;  /* lv1 page table, 16KB */
 243         short *lv2entcnt;       /* free lv2 entry counter for each section */
 244         spinlock_t lock;        /* lock for modyfying list of clients */
 245         spinlock_t pgtablelock; /* lock for modifying page table @ pgtable */
 246         struct iommu_domain domain; /* generic domain data structure */
 247 };
 248
 249 /*
 250  * SysMMU version specific data. Contains offsets for the registers which can
 251  * be found in different SysMMU variants, but have different offset values.
 252  */
 253 struct sysmmu_variant {
 254         u32 pt_base;            /* page table base address (physical) */
 255         u32 flush_all;          /* invalidate all TLB entries */
 256         u32 flush_entry;        /* invalidate specific TLB entry */
 257         u32 flush_range;        /* invalidate TLB entries in specified range */
 258         u32 flush_start;        /* start address of range invalidation */
 259         u32 flush_end;          /* end address of range invalidation */
 260         u32 int_status;         /* interrupt status information */
 261         u32 int_clear;          /* clear the interrupt */
 262 };
 263
 264 /*
 265  * This structure hold all data of a single SYSMMU controller, this includes
 266  * hw resources like registers and clocks, pointers and list nodes to connect
 267  * it to all other structures, internal state and parameters read from device
 268  * tree. It is usually referenced by 'data' pointer.
 269  */
 270 struct sysmmu_drvdata {
 271         struct device *sysmmu;          /* SYSMMU controller device */
 272         struct device *master;          /* master device (owner) */
 273         struct device_link *link;       /* runtime PM link to master */
 274         void __iomem *sfrbase;          /* our registers */
 275         struct clk *clk;                /* SYSMMU's clock */
 276         struct clk *aclk;               /* SYSMMU's aclk clock */
 277         struct clk *pclk;               /* SYSMMU's pclk clock */
 278         struct clk *clk_master;         /* master's device clock */
 279         spinlock_t lock;                /* lock for modyfying state */
 280         bool active;                    /* current status */
 281         struct exynos_iommu_domain *domain; /* domain we belong to */
 282         struct list_head domain_node;   /* node for domain clients list */
 283         struct list_head owner_node;    /* node for owner controllers list */
 284         phys_addr_t pgtable;            /* assigned page table structure */
 285         unsigned int version;           /* our version */
 286
 287         struct iommu_device iommu;      /* IOMMU core handle */
 288         const struct sysmmu_variant *variant; /* version specific data */
 289
 290         /* v7 fields */
 291         bool has_vcr;                   /* virtual machine control register */
 292 };
 293
 294 #define SYSMMU_REG(data, reg) ((data)->sfrbase + (data)->variant->reg)
 295
 296 /* SysMMU v1..v3 */
 297 static const struct sysmmu_variant sysmmu_v1_variant = {
 298         .flush_all      = 0x0c,
 299         .flush_entry    = 0x10,
 300         .pt_base        = 0x14,
 301         .int_status     = 0x18,
 302         .int_clear      = 0x1c,
 303 };
 304
 305 /* SysMMU v5 and v7 (non-VM capable) */
 306 static const struct sysmmu_variant sysmmu_v5_variant = {
 307         .pt_base        = 0x0c,
 308         .flush_all      = 0x10,
 309         .flush_entry    = 0x14,
 310         .flush_range    = 0x18,
 311         .flush_start    = 0x20,
 312         .flush_end      = 0x24,
 313         .int_status     = 0x60,
 314         .int_clear      = 0x64,
 315 };
 316
 317 /* SysMMU v7: VM capable register set */
 318 static const struct sysmmu_variant sysmmu_v7_vm_variant = {
 319         .pt_base        = 0x800c,
 320         .flush_all      = 0x8010,
 321         .flush_entry    = 0x8014,
 322         .flush_range    = 0x8018,
 323         .flush_start    = 0x8020,
 324         .flush_end      = 0x8024,
 325         .int_status     = 0x60,
 326         .int_clear      = 0x64,
 327 };
 328
 329 static struct exynos_iommu_domain *to_exynos_domain(struct iommu_domain *dom)
 330 {
 331         return container_of(dom, struct exynos_iommu_domain, domain);
 332 }
 333
 334 static void sysmmu_unblock(struct sysmmu_drvdata *data)
 335 {
 336         writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL);
 337 }
 338
 339 static bool sysmmu_block(struct sysmmu_drvdata *data)
 340 {
 341         int i = 120;
 342
 343         writel(CTRL_BLOCK, data->sfrbase + REG_MMU_CTRL);
 344         while ((i > 0) && !(readl(data->sfrbase + REG_MMU_STATUS) & 1))
 345                 --i;
 346
 347         if (!(readl(data->sfrbase + REG_MMU_STATUS) & 1)) {
 348                 sysmmu_unblock(data);
 349                 return false;
 350         }
 351
 352         return true;
 353 }
 354
 355 static void __sysmmu_tlb_invalidate(struct sysmmu_drvdata *data)
 356 {
 357         writel(0x1, SYSMMU_REG(data, flush_all));
 358 }
 359
 360 static void __sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data,
 361                                 sysmmu_iova_t iova, unsigned int num_inv)
 362 {
 363         unsigned int i;
 364
 365         if (MMU_MAJ_VER(data->version) < 5 || num_inv == 1) {
 366                 for (i = 0; i < num_inv; i++) {
 367                         writel((iova & SPAGE_MASK) | 1,
 368                                SYSMMU_REG(data, flush_entry));
 369                         iova += SPAGE_SIZE;
 370                 }
 371         } else {
 372                 writel(iova & SPAGE_MASK, SYSMMU_REG(data, flush_start));
 373                 writel((iova & SPAGE_MASK) + (num_inv - 1) * SPAGE_SIZE,
 374                        SYSMMU_REG(data, flush_end));
 375                 writel(0x1, SYSMMU_REG(data, flush_range));
 376         }
 377 }
 378
 379 static void __sysmmu_set_ptbase(struct sysmmu_drvdata *data, phys_addr_t pgd)
 380 {
 381         u32 pt_base;
 382
 383         if (MMU_MAJ_VER(data->version) < 5)
 384                 pt_base = pgd;
 385         else
 386                 pt_base = pgd >> SPAGE_ORDER;
 387
 388         writel(pt_base, SYSMMU_REG(data, pt_base));
 389         __sysmmu_tlb_invalidate(data);
 390 }
 391
 392 static void __sysmmu_enable_clocks(struct sysmmu_drvdata *data)
 393 {
 394         BUG_ON(clk_prepare_enable(data->clk_master));
 395         BUG_ON(clk_prepare_enable(data->clk));
 396         BUG_ON(clk_prepare_enable(data->pclk));
 397         BUG_ON(clk_prepare_enable(data->aclk));
 398 }
 399
 400 static void __sysmmu_disable_clocks(struct sysmmu_drvdata *data)
 401 {
 402         clk_disable_unprepare(data->aclk);
 403         clk_disable_unprepare(data->pclk);
 404         clk_disable_unprepare(data->clk);
 405         clk_disable_unprepare(data->clk_master);
 406 }
 407
 408 static bool __sysmmu_has_capa1(struct sysmmu_drvdata *data)
 409 {
 410         u32 capa0 = readl(data->sfrbase + REG_V7_CAPA0);
 411
 412         return capa0 & CAPA0_CAPA1_EXIST;
 413 }
 414
 415 static void __sysmmu_get_vcr(struct sysmmu_drvdata *data)
 416 {
 417         u32 capa1 = readl(data->sfrbase + REG_V7_CAPA1);
 418
 419         data->has_vcr = capa1 & CAPA1_VCR_ENABLED;
 420 }
 421
 422 static void __sysmmu_get_version(struct sysmmu_drvdata *data)
 423 {
 424         u32 ver;
 425
 426         __sysmmu_enable_clocks(data);
 427
 428         ver = readl(data->sfrbase + REG_MMU_VERSION);
 429
 430         /* controllers on some SoCs don't report proper version */
 431         if (ver == 0x80000001u)
 432                 data->version = MAKE_MMU_VER(1, 0);
 433         else
 434                 data->version = MMU_RAW_VER(ver);
 435
 436         dev_dbg(data->sysmmu, "hardware version: %d.%d\n",
 437                 MMU_MAJ_VER(data->version), MMU_MIN_VER(data->version));
 438
 439         if (MMU_MAJ_VER(data->version) < 5) {
 440                 data->variant = &sysmmu_v1_variant;
 441         } else if (MMU_MAJ_VER(data->version) < 7) {
 442                 data->variant = &sysmmu_v5_variant;
 443         } else {
 444                 if (__sysmmu_has_capa1(data))
 445                         __sysmmu_get_vcr(data);
 446                 if (data->has_vcr)
 447                         data->variant = &sysmmu_v7_vm_variant;
 448                 else
 449                         data->variant = &sysmmu_v5_variant;
 450         }
 451
 452         __sysmmu_disable_clocks(data);
 453 }
 454
 455 static void show_fault_information(struct sysmmu_drvdata *data,
 456                                    const struct sysmmu_fault_info *finfo,
 457                                    sysmmu_iova_t fault_addr)
 458 {
 459         sysmmu_pte_t *ent;
 460
 461         dev_err(data->sysmmu, "%s: %s FAULT occurred at %#x\n",
 462                 dev_name(data->master), finfo->name, fault_addr);
 463         dev_dbg(data->sysmmu, "Page table base: %pa\n", &data->pgtable);
 464         ent = section_entry(phys_to_virt(data->pgtable), fault_addr);
 465         dev_dbg(data->sysmmu, "\tLv1 entry: %#x\n", *ent);
 466         if (lv1ent_page(ent)) {
 467                 ent = page_entry(ent, fault_addr);
 468                 dev_dbg(data->sysmmu, "\t Lv2 entry: %#x\n", *ent);
 469         }
 470 }
 471
 472 static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
 473 {
 474         /* SYSMMU is in blocked state when interrupt occurred. */
 475         struct sysmmu_drvdata *data = dev_id;
 476         const struct sysmmu_fault_info *finfo;
 477         unsigned int i, n, itype;
 478         sysmmu_iova_t fault_addr;
 479         int ret = -ENOSYS;
 480
 481         WARN_ON(!data->active);
 482
 483         if (MMU_MAJ_VER(data->version) < 5) {
 484                 finfo = sysmmu_faults;
 485                 n = ARRAY_SIZE(sysmmu_faults);
 486         } else {
 487                 finfo = sysmmu_v5_faults;
 488                 n = ARRAY_SIZE(sysmmu_v5_faults);
 489         }
 490
 491         spin_lock(&data->lock);
 492
 493         clk_enable(data->clk_master);
 494
 495         itype = __ffs(readl(SYSMMU_REG(data, int_status)));
 496         for (i = 0; i < n; i++, finfo++)
 497                 if (finfo->bit == itype)
 498                         break;
 499         /* unknown/unsupported fault */
 500         BUG_ON(i == n);
 501
 502         /* print debug message */
 503         fault_addr = readl(data->sfrbase + finfo->addr_reg);
 504         show_fault_information(data, finfo, fault_addr);
 505
 506         if (data->domain)
 507                 ret = report_iommu_fault(&data->domain->domain,
 508                                         data->master, fault_addr, finfo->type);
 509         /* fault is not recovered by fault handler */
 510         BUG_ON(ret != 0);
 511
 512         writel(1 << itype, SYSMMU_REG(data, int_clear));
 513
 514         sysmmu_unblock(data);
 515
 516         clk_disable(data->clk_master);
 517
 518         spin_unlock(&data->lock);
 519
 520         return IRQ_HANDLED;
 521 }
 522
 523 static void __sysmmu_disable(struct sysmmu_drvdata *data)
 524 {
 525         unsigned long flags;
 526
 527         clk_enable(data->clk_master);
 528
 529         spin_lock_irqsave(&data->lock, flags);
 530         writel(CTRL_DISABLE, data->sfrbase + REG_MMU_CTRL);
 531         writel(0, data->sfrbase + REG_MMU_CFG);
 532         data->active = false;
 533         spin_unlock_irqrestore(&data->lock, flags);
 534
 535         __sysmmu_disable_clocks(data);
 536 }
 537
 538 static void __sysmmu_init_config(struct sysmmu_drvdata *data)
 539 {
 540         unsigned int cfg;
 541
 542         if (data->version <= MAKE_MMU_VER(3, 1))
 543                 cfg = CFG_LRU | CFG_QOS(15);
 544         else if (data->version <= MAKE_MMU_VER(3, 2))
 545                 cfg = CFG_LRU | CFG_QOS(15) | CFG_FLPDCACHE | CFG_SYSSEL;
 546         else
 547                 cfg = CFG_QOS(15) | CFG_FLPDCACHE | CFG_ACGEN;
 548
 549         cfg |= CFG_EAP; /* enable access protection bits check */
 550
 551         writel(cfg, data->sfrbase + REG_MMU_CFG);
 552 }
 553
 554 static void __sysmmu_enable_vid(struct sysmmu_drvdata *data)
 555 {
 556         u32 ctrl;
 557
 558         if (MMU_MAJ_VER(data->version) < 7 || !data->has_vcr)
 559                 return;
 560
 561         ctrl = readl(data->sfrbase + REG_V7_CTRL_VM);
 562         ctrl |= CTRL_VM_ENABLE | CTRL_VM_FAULT_MODE_STALL;
 563         writel(ctrl, data->sfrbase + REG_V7_CTRL_VM);
 564 }
 565
 566 static void __sysmmu_enable(struct sysmmu_drvdata *data)
 567 {
 568         unsigned long flags;
 569
 570         __sysmmu_enable_clocks(data);
 571
 572         spin_lock_irqsave(&data->lock, flags);
 573         writel(CTRL_BLOCK, data->sfrbase + REG_MMU_CTRL);
 574         __sysmmu_init_config(data);
 575         __sysmmu_set_ptbase(data, data->pgtable);
 576         __sysmmu_enable_vid(data);
 577         writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL);
 578         data->active = true;
 579         spin_unlock_irqrestore(&data->lock, flags);
 580
 581         /*
 582          * SYSMMU driver keeps master's clock enabled only for the short
 583          * time, while accessing the registers. For performing address
 584          * translation during DMA transaction it relies on the client
 585          * driver to enable it.
 586          */
 587         clk_disable(data->clk_master);
 588 }
 589
 590 static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data,
 591                                             sysmmu_iova_t iova)
 592 {
 593         unsigned long flags;
 594
 595         spin_lock_irqsave(&data->lock, flags);
 596         if (data->active && data->version >= MAKE_MMU_VER(3, 3)) {
 597                 clk_enable(data->clk_master);
 598                 if (sysmmu_block(data)) {
 599                         if (data->version >= MAKE_MMU_VER(5, 0))
 600                                 __sysmmu_tlb_invalidate(data);
 601                         else
 602                                 __sysmmu_tlb_invalidate_entry(data, iova, 1);
 603                         sysmmu_unblock(data);
 604                 }
 605                 clk_disable(data->clk_master);
 606         }
 607         spin_unlock_irqrestore(&data->lock, flags);
 608 }
 609
 610 static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data,
 611                                         sysmmu_iova_t iova, size_t size)
 612 {
 613         unsigned long flags;
 614
 615         spin_lock_irqsave(&data->lock, flags);
 616         if (data->active) {
 617                 unsigned int num_inv = 1;
 618
 619                 clk_enable(data->clk_master);
 620
 621                 /*
 622                  * L2TLB invalidation required
 623                  * 4KB page: 1 invalidation
 624                  * 64KB page: 16 invalidations
 625                  * 1MB page: 64 invalidations
 626                  * because it is set-associative TLB
 627                  * with 8-way and 64 sets.
 628                  * 1MB page can be cached in one of all sets.
 629                  * 64KB page can be one of 16 consecutive sets.
 630                  */
 631                 if (MMU_MAJ_VER(data->version) == 2)
 632                         num_inv = min_t(unsigned int, size / SPAGE_SIZE, 64);
 633
 634                 if (sysmmu_block(data)) {
 635                         __sysmmu_tlb_invalidate_entry(data, iova, num_inv);
 636                         sysmmu_unblock(data);
 637                 }
 638                 clk_disable(data->clk_master);
 639         }
 640         spin_unlock_irqrestore(&data->lock, flags);
 641 }
 642
 643 static const struct iommu_ops exynos_iommu_ops;
 644
 645 static int exynos_sysmmu_probe(struct platform_device *pdev)
 646 {
 647         int irq, ret;
 648         struct device *dev = &pdev->dev;
 649         struct sysmmu_drvdata *data;
 650         struct resource *res;
 651
 652         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 653         if (!data)
 654                 return -ENOMEM;
 655
 656         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 657         data->sfrbase = devm_ioremap_resource(dev, res);
 658         if (IS_ERR(data->sfrbase))
 659                 return PTR_ERR(data->sfrbase);
 660
 661         irq = platform_get_irq(pdev, 0);
 662         if (irq <= 0)
 663                 return irq;
 664
 665         ret = devm_request_irq(dev, irq, exynos_sysmmu_irq, 0,
 666                                 dev_name(dev), data);
 667         if (ret) {
 668                 dev_err(dev, "Unabled to register handler of irq %d\n", irq);
 669                 return ret;
 670         }
 671
 672         data->clk = devm_clk_get(dev, "sysmmu");
 673         if (PTR_ERR(data->clk) == -ENOENT)
 674                 data->clk = NULL;
 675         else if (IS_ERR(data->clk))
 676                 return PTR_ERR(data->clk);
 677
 678         data->aclk = devm_clk_get(dev, "aclk");
 679         if (PTR_ERR(data->aclk) == -ENOENT)
 680                 data->aclk = NULL;
 681         else if (IS_ERR(data->aclk))
 682                 return PTR_ERR(data->aclk);
 683
 684         data->pclk = devm_clk_get(dev, "pclk");
 685         if (PTR_ERR(data->pclk) == -ENOENT)
 686                 data->pclk = NULL;
 687         else if (IS_ERR(data->pclk))
 688                 return PTR_ERR(data->pclk);
 689
 690         if (!data->clk && (!data->aclk || !data->pclk)) {
 691                 dev_err(dev, "Failed to get device clock(s)!\n");
 692                 return -ENOSYS;
 693         }
 694
 695         data->clk_master = devm_clk_get(dev, "master");
 696         if (PTR_ERR(data->clk_master) == -ENOENT)
 697                 data->clk_master = NULL;
 698         else if (IS_ERR(data->clk_master))
 699                 return PTR_ERR(data->clk_master);
 700
 701         data->sysmmu = dev;
 702         spin_lock_init(&data->lock);
 703
 704         __sysmmu_get_version(data);
 705
 706         ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL,
 707                                      dev_name(data->sysmmu));
 708         if (ret)
 709                 return ret;
 710
 711         platform_set_drvdata(pdev, data);
 712
 713         if (PG_ENT_SHIFT < 0) {
 714                 if (MMU_MAJ_VER(data->version) < 5) {
 715                         PG_ENT_SHIFT = SYSMMU_PG_ENT_SHIFT;
 716                         LV1_PROT = SYSMMU_LV1_PROT;
 717                         LV2_PROT = SYSMMU_LV2_PROT;
 718                 } else {
 719                         PG_ENT_SHIFT = SYSMMU_V5_PG_ENT_SHIFT;
 720                         LV1_PROT = SYSMMU_V5_LV1_PROT;
 721                         LV2_PROT = SYSMMU_V5_LV2_PROT;
 722                 }
 723         }
 724
 725         if (MMU_MAJ_VER(data->version) >= 5) {
 726                 ret = dma_set_mask(dev, DMA_BIT_MASK(36));
 727                 if (ret) {
 728                         dev_err(dev, "Unable to set DMA mask: %d\n", ret);
 729                         goto err_dma_set_mask;
 730                 }
 731         }
 732
 733         /*
 734          * use the first registered sysmmu device for performing
 735          * dma mapping operations on iommu page tables (cpu cache flush)
 736          */
 737         if (!dma_dev)
 738                 dma_dev = &pdev->dev;
 739
 740         pm_runtime_enable(dev);
 741
 742         ret = iommu_device_register(&data->iommu, &exynos_iommu_ops, dev);
 743         if (ret)
 744                 goto err_dma_set_mask;
 745
 746         return 0;
 747
 748 err_dma_set_mask:
 749         iommu_device_sysfs_remove(&data->iommu);
 750         return ret;
 751 }
 752
 753 static int __maybe_unused exynos_sysmmu_suspend(struct device *dev)
 754 {
 755         struct sysmmu_drvdata *data = dev_get_drvdata(dev);
 756         struct device *master = data->master;
 757
 758         if (master) {
 759                 struct exynos_iommu_owner *owner = dev_iommu_priv_get(master);
 760
 761                 mutex_lock(&owner->rpm_lock);
 762                 if (data->domain) {
 763                         dev_dbg(data->sysmmu, "saving state\n");
 764                         __sysmmu_disable(data);
 765                 }
 766                 mutex_unlock(&owner->rpm_lock);
 767         }
 768         return 0;
 769 }
 770
 771 static int __maybe_unused exynos_sysmmu_resume(struct device *dev)
 772 {
 773         struct sysmmu_drvdata *data = dev_get_drvdata(dev);
 774         struct device *master = data->master;
 775
 776         if (master) {
 777                 struct exynos_iommu_owner *owner = dev_iommu_priv_get(master);
 778
 779                 mutex_lock(&owner->rpm_lock);
 780                 if (data->domain) {
 781                         dev_dbg(data->sysmmu, "restoring state\n");
 782                         __sysmmu_enable(data);
 783                 }
 784                 mutex_unlock(&owner->rpm_lock);
 785         }
 786         return 0;
 787 }
 788
 789 static const struct dev_pm_ops sysmmu_pm_ops = {
 790         SET_RUNTIME_PM_OPS(exynos_sysmmu_suspend, exynos_sysmmu_resume, NULL)
 791         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 792                                 pm_runtime_force_resume)
 793 };
 794
 795 static const struct of_device_id sysmmu_of_match[] = {
 796         { .compatible   = "samsung,exynos-sysmmu", },
 797         { },
 798 };
 799
 800 static struct platform_driver exynos_sysmmu_driver __refdata = {
 801         .probe  = exynos_sysmmu_probe,
 802         .driver = {
 803                 .name           = "exynos-sysmmu",
 804                 .of_match_table = sysmmu_of_match,
 805                 .pm             = &sysmmu_pm_ops,
 806                 .suppress_bind_attrs = true,
 807         }
 808 };
 809
 810 static inline void exynos_iommu_set_pte(sysmmu_pte_t *ent, sysmmu_pte_t val)
 811 {
 812         dma_sync_single_for_cpu(dma_dev, virt_to_phys(ent), sizeof(*ent),
 813                                 DMA_TO_DEVICE);
 814         *ent = cpu_to_le32(val);
 815         dma_sync_single_for_device(dma_dev, virt_to_phys(ent), sizeof(*ent),
 816                                    DMA_TO_DEVICE);
 817 }
 818
 819 static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type)
 820 {
 821         struct exynos_iommu_domain *domain;
 822         dma_addr_t handle;
 823         int i;
 824
 825         /* Check if correct PTE offsets are initialized */
 826         BUG_ON(PG_ENT_SHIFT < 0 || !dma_dev);
 827
 828         if (type != IOMMU_DOMAIN_DMA && type != IOMMU_DOMAIN_UNMANAGED)
 829                 return NULL;
 830
 831         domain = kzalloc(sizeof(*domain), GFP_KERNEL);
 832         if (!domain)
 833                 return NULL;
 834
 835         domain->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2);
 836         if (!domain->pgtable)
 837                 goto err_pgtable;
 838
 839         domain->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1);
 840         if (!domain->lv2entcnt)
 841                 goto err_counter;
 842
 843         /* Workaround for System MMU v3.3 to prevent caching 1MiB mapping */
 844         for (i = 0; i < NUM_LV1ENTRIES; i++)
 845                 domain->pgtable[i] = ZERO_LV2LINK;
 846
 847         handle = dma_map_single(dma_dev, domain->pgtable, LV1TABLE_SIZE,
 848                                 DMA_TO_DEVICE);
 849         /* For mapping page table entries we rely on dma == phys */
 850         BUG_ON(handle != virt_to_phys(domain->pgtable));
 851         if (dma_mapping_error(dma_dev, handle))
 852                 goto err_lv2ent;
 853
 854         spin_lock_init(&domain->lock);
 855         spin_lock_init(&domain->pgtablelock);
 856         INIT_LIST_HEAD(&domain->clients);
 857
 858         domain->domain.geometry.aperture_start = 0;
 859         domain->domain.geometry.aperture_end   = ~0UL;
 860         domain->domain.geometry.force_aperture = true;
 861
 862         return &domain->domain;
 863
 864 err_lv2ent:
 865         free_pages((unsigned long)domain->lv2entcnt, 1);
 866 err_counter:
 867         free_pages((unsigned long)domain->pgtable, 2);
 868 err_pgtable:
 869         kfree(domain);
 870         return NULL;
 871 }
 872
 873 static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain)
 874 {
 875         struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
 876         struct sysmmu_drvdata *data, *next;
 877         unsigned long flags;
 878         int i;
 879
 880         WARN_ON(!list_empty(&domain->clients));
 881
 882         spin_lock_irqsave(&domain->lock, flags);
 883
 884         list_for_each_entry_safe(data, next, &domain->clients, domain_node) {
 885                 spin_lock(&data->lock);
 886                 __sysmmu_disable(data);
 887                 data->pgtable = 0;
 888                 data->domain = NULL;
 889                 list_del_init(&data->domain_node);
 890                 spin_unlock(&data->lock);
 891         }
 892
 893         spin_unlock_irqrestore(&domain->lock, flags);
 894
 895         dma_unmap_single(dma_dev, virt_to_phys(domain->pgtable), LV1TABLE_SIZE,
 896                          DMA_TO_DEVICE);
 897
 898         for (i = 0; i < NUM_LV1ENTRIES; i++)
 899                 if (lv1ent_page(domain->pgtable + i)) {
 900                         phys_addr_t base = lv2table_base(domain->pgtable + i);
 901
 902                         dma_unmap_single(dma_dev, base, LV2TABLE_SIZE,
 903                                          DMA_TO_DEVICE);
 904                         kmem_cache_free(lv2table_kmem_cache,
 905                                         phys_to_virt(base));
 906                 }
 907
 908         free_pages((unsigned long)domain->pgtable, 2);
 909         free_pages((unsigned long)domain->lv2entcnt, 1);
 910         kfree(domain);
 911 }
 912
 913 static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain,
 914                                     struct device *dev)
 915 {
 916         struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
 917         struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
 918         phys_addr_t pagetable = virt_to_phys(domain->pgtable);
 919         struct sysmmu_drvdata *data, *next;
 920         unsigned long flags;
 921
 922         if (!has_sysmmu(dev) || owner->domain != iommu_domain)
 923                 return;
 924
 925         mutex_lock(&owner->rpm_lock);
 926
 927         list_for_each_entry(data, &owner->controllers, owner_node) {
 928                 pm_runtime_get_noresume(data->sysmmu);
 929                 if (pm_runtime_active(data->sysmmu))
 930                         __sysmmu_disable(data);
 931                 pm_runtime_put(data->sysmmu);
 932         }
 933
 934         spin_lock_irqsave(&domain->lock, flags);
 935         list_for_each_entry_safe(data, next, &domain->clients, domain_node) {
 936                 spin_lock(&data->lock);
 937                 data->pgtable = 0;
 938                 data->domain = NULL;
 939                 list_del_init(&data->domain_node);
 940                 spin_unlock(&data->lock);
 941         }
 942         owner->domain = NULL;
 943         spin_unlock_irqrestore(&domain->lock, flags);
 944
 945         mutex_unlock(&owner->rpm_lock);
 946
 947         dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n", __func__,
 948                 &pagetable);
 949 }
 950
 951 static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain,
 952                                    struct device *dev)
 953 {
 954         struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
 955         struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
 956         struct sysmmu_drvdata *data;
 957         phys_addr_t pagetable = virt_to_phys(domain->pgtable);
 958         unsigned long flags;
 959
 960         if (!has_sysmmu(dev))
 961                 return -ENODEV;
 962
 963         if (owner->domain)
 964                 exynos_iommu_detach_device(owner->domain, dev);
 965
 966         mutex_lock(&owner->rpm_lock);
 967
 968         spin_lock_irqsave(&domain->lock, flags);
 969         list_for_each_entry(data, &owner->controllers, owner_node) {
 970                 spin_lock(&data->lock);
 971                 data->pgtable = pagetable;
 972                 data->domain = domain;
 973                 list_add_tail(&data->domain_node, &domain->clients);
 974                 spin_unlock(&data->lock);
 975         }
 976         owner->domain = iommu_domain;
 977         spin_unlock_irqrestore(&domain->lock, flags);
 978
 979         list_for_each_entry(data, &owner->controllers, owner_node) {
 980                 pm_runtime_get_noresume(data->sysmmu);
 981                 if (pm_runtime_active(data->sysmmu))
 982                         __sysmmu_enable(data);
 983                 pm_runtime_put(data->sysmmu);
 984         }
 985
 986         mutex_unlock(&owner->rpm_lock);
 987
 988         dev_dbg(dev, "%s: Attached IOMMU with pgtable %pa\n", __func__,
 989                 &pagetable);
 990
 991         return 0;
 992 }
 993
 994 static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *domain,
 995                 sysmmu_pte_t *sent, sysmmu_iova_t iova, short *pgcounter)
 996 {
 997         if (lv1ent_section(sent)) {
 998                 WARN(1, "Trying mapping on %#08x mapped with 1MiB page", iova);
 999                 return ERR_PTR(-EADDRINUSE);
1000         }
1001
1002         if (lv1ent_fault(sent)) {
1003                 dma_addr_t handle;
1004                 sysmmu_pte_t *pent;
1005                 bool need_flush_flpd_cache = lv1ent_zero(sent);
1006
1007                 pent = kmem_cache_zalloc(lv2table_kmem_cache, GFP_ATOMIC);
1008                 BUG_ON((uintptr_t)pent & (LV2TABLE_SIZE - 1));
1009                 if (!pent)
1010                         return ERR_PTR(-ENOMEM);
1011
1012                 exynos_iommu_set_pte(sent, mk_lv1ent_page(virt_to_phys(pent)));
1013                 kmemleak_ignore(pent);
1014                 *pgcounter = NUM_LV2ENTRIES;
1015                 handle = dma_map_single(dma_dev, pent, LV2TABLE_SIZE,
1016                                         DMA_TO_DEVICE);
1017                 if (dma_mapping_error(dma_dev, handle)) {
1018                         kmem_cache_free(lv2table_kmem_cache, pent);
1019                         return ERR_PTR(-EADDRINUSE);
1020                 }
1021
1022                 /*
1023                  * If pre-fetched SLPD is a faulty SLPD in zero_l2_table,
1024                  * FLPD cache may cache the address of zero_l2_table. This
1025                  * function replaces the zero_l2_table with new L2 page table
1026                  * to write valid mappings.
1027                  * Accessing the valid area may cause page fault since FLPD
1028                  * cache may still cache zero_l2_table for the valid area
1029                  * instead of new L2 page table that has the mapping
1030                  * information of the valid area.
1031                  * Thus any replacement of zero_l2_table with other valid L2
1032                  * page table must involve FLPD cache invalidation for System
1033                  * MMU v3.3.
1034                  * FLPD cache invalidation is performed with TLB invalidation
1035                  * by VPN without blocking. It is safe to invalidate TLB without
1036                  * blocking because the target address of TLB invalidation is
1037                  * not currently mapped.
1038                  */
1039                 if (need_flush_flpd_cache) {
1040                         struct sysmmu_drvdata *data;
1041
1042                         spin_lock(&domain->lock);
1043                         list_for_each_entry(data, &domain->clients, domain_node)
1044                                 sysmmu_tlb_invalidate_flpdcache(data, iova);
1045                         spin_unlock(&domain->lock);
1046                 }
1047         }
1048
1049         return page_entry(sent, iova);
1050 }
1051
1052 static int lv1set_section(struct exynos_iommu_domain *domain,
1053                           sysmmu_pte_t *sent, sysmmu_iova_t iova,
1054                           phys_addr_t paddr, int prot, short *pgcnt)
1055 {
1056         if (lv1ent_section(sent)) {
1057                 WARN(1, "Trying mapping on 1MiB@%#08x that is mapped",
1058                         iova);
1059                 return -EADDRINUSE;
1060         }
1061
1062         if (lv1ent_page(sent)) {
1063                 if (*pgcnt != NUM_LV2ENTRIES) {
1064                         WARN(1, "Trying mapping on 1MiB@%#08x that is mapped",
1065                                 iova);
1066                         return -EADDRINUSE;
1067                 }
1068
1069                 kmem_cache_free(lv2table_kmem_cache, page_entry(sent, 0));
1070                 *pgcnt = 0;
1071         }
1072
1073         exynos_iommu_set_pte(sent, mk_lv1ent_sect(paddr, prot));
1074
1075         spin_lock(&domain->lock);
1076         if (lv1ent_page_zero(sent)) {
1077                 struct sysmmu_drvdata *data;
1078                 /*
1079                  * Flushing FLPD cache in System MMU v3.3 that may cache a FLPD
1080                  * entry by speculative prefetch of SLPD which has no mapping.
1081                  */
1082                 list_for_each_entry(data, &domain->clients, domain_node)
1083                         sysmmu_tlb_invalidate_flpdcache(data, iova);
1084         }
1085         spin_unlock(&domain->lock);
1086
1087         return 0;
1088 }
1089
1090 static int lv2set_page(sysmmu_pte_t *pent, phys_addr_t paddr, size_t size,
1091                        int prot, short *pgcnt)
1092 {
1093         if (size == SPAGE_SIZE) {
1094                 if (WARN_ON(!lv2ent_fault(pent)))
1095                         return -EADDRINUSE;
1096
1097                 exynos_iommu_set_pte(pent, mk_lv2ent_spage(paddr, prot));
1098                 *pgcnt -= 1;
1099         } else { /* size == LPAGE_SIZE */
1100                 int i;
1101                 dma_addr_t pent_base = virt_to_phys(pent);
1102
1103                 dma_sync_single_for_cpu(dma_dev, pent_base,
1104                                         sizeof(*pent) * SPAGES_PER_LPAGE,
1105                                         DMA_TO_DEVICE);
1106                 for (i = 0; i < SPAGES_PER_LPAGE; i++, pent++) {
1107                         if (WARN_ON(!lv2ent_fault(pent))) {
1108                                 if (i > 0)
1109                                         memset(pent - i, 0, sizeof(*pent) * i);
1110                                 return -EADDRINUSE;
1111                         }
1112
1113                         *pent = mk_lv2ent_lpage(paddr, prot);
1114                 }
1115                 dma_sync_single_for_device(dma_dev, pent_base,
1116                                            sizeof(*pent) * SPAGES_PER_LPAGE,
1117                                            DMA_TO_DEVICE);
1118                 *pgcnt -= SPAGES_PER_LPAGE;
1119         }
1120
1121         return 0;
1122 }
1123
1124 /*
1125  * *CAUTION* to the I/O virtual memory managers that support exynos-iommu:
1126  *
1127  * System MMU v3.x has advanced logic to improve address translation
1128  * performance with caching more page table entries by a page table walk.
1129  * However, the logic has a bug that while caching faulty page table entries,
1130  * System MMU reports page fault if the cached fault entry is hit even though
1131  * the fault entry is updated to a valid entry after the entry is cached.
1132  * To prevent caching faulty page table entries which may be updated to valid
1133  * entries later, the virtual memory manager should care about the workaround
1134  * for the problem. The following describes the workaround.
1135  *
1136  * Any two consecutive I/O virtual address regions must have a hole of 128KiB
1137  * at maximum to prevent misbehavior of System MMU 3.x (workaround for h/w bug).
1138  *
1139  * Precisely, any start address of I/O virtual region must be aligned with
1140  * the following sizes for System MMU v3.1 and v3.2.
1141  * System MMU v3.1: 128KiB
1142  * System MMU v3.2: 256KiB
1143  *
1144  * Because System MMU v3.3 caches page table entries more aggressively, it needs
1145  * more workarounds.
1146  * - Any two consecutive I/O virtual regions must have a hole of size larger
1147  *   than or equal to 128KiB.
1148  * - Start address of an I/O virtual region must be aligned by 128KiB.
1149  */
1150 static int exynos_iommu_map(struct iommu_domain *iommu_domain,
1151                             unsigned long l_iova, phys_addr_t paddr, size_t size,
1152                             int prot, gfp_t gfp)
1153 {
1154         struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
1155         sysmmu_pte_t *entry;
1156         sysmmu_iova_t iova = (sysmmu_iova_t)l_iova;
1157         unsigned long flags;
1158         int ret = -ENOMEM;
1159
1160         BUG_ON(domain->pgtable == NULL);
1161         prot &= SYSMMU_SUPPORTED_PROT_BITS;
1162
1163         spin_lock_irqsave(&domain->pgtablelock, flags);
1164
1165         entry = section_entry(domain->pgtable, iova);
1166
1167         if (size == SECT_SIZE) {
1168                 ret = lv1set_section(domain, entry, iova, paddr, prot,
1169                                      &domain->lv2entcnt[lv1ent_offset(iova)]);
1170         } else {
1171                 sysmmu_pte_t *pent;
1172
1173                 pent = alloc_lv2entry(domain, entry, iova,
1174                                       &domain->lv2entcnt[lv1ent_offset(iova)]);
1175
1176                 if (IS_ERR(pent))
1177                         ret = PTR_ERR(pent);
1178                 else
1179                         ret = lv2set_page(pent, paddr, size, prot,
1180                                        &domain->lv2entcnt[lv1ent_offset(iova)]);
1181         }
1182
1183         if (ret)
1184                 pr_err("%s: Failed(%d) to map %#zx bytes @ %#x\n",
1185                         __func__, ret, size, iova);
1186
1187         spin_unlock_irqrestore(&domain->pgtablelock, flags);
1188
1189         return ret;
1190 }
1191
1192 static void exynos_iommu_tlb_invalidate_entry(struct exynos_iommu_domain *domain,
1193                                               sysmmu_iova_t iova, size_t size)
1194 {
1195         struct sysmmu_drvdata *data;
1196         unsigned long flags;
1197
1198         spin_lock_irqsave(&domain->lock, flags);
1199
1200         list_for_each_entry(data, &domain->clients, domain_node)
1201                 sysmmu_tlb_invalidate_entry(data, iova, size);
1202
1203         spin_unlock_irqrestore(&domain->lock, flags);
1204 }
1205
1206 static size_t exynos_iommu_unmap(struct iommu_domain *iommu_domain,
1207                                  unsigned long l_iova, size_t size,
1208                                  struct iommu_iotlb_gather *gather)
1209 {
1210         struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
1211         sysmmu_iova_t iova = (sysmmu_iova_t)l_iova;
1212         sysmmu_pte_t *ent;
1213         size_t err_pgsize;
1214         unsigned long flags;
1215
1216         BUG_ON(domain->pgtable == NULL);
1217
1218         spin_lock_irqsave(&domain->pgtablelock, flags);
1219
1220         ent = section_entry(domain->pgtable, iova);
1221
1222         if (lv1ent_section(ent)) {
1223                 if (WARN_ON(size < SECT_SIZE)) {
1224                         err_pgsize = SECT_SIZE;
1225                         goto err;
1226                 }
1227
1228                 /* workaround for h/w bug in System MMU v3.3 */
1229                 exynos_iommu_set_pte(ent, ZERO_LV2LINK);
1230                 size = SECT_SIZE;
1231                 goto done;
1232         }
1233
1234         if (unlikely(lv1ent_fault(ent))) {
1235                 if (size > SECT_SIZE)
1236                         size = SECT_SIZE;
1237                 goto done;
1238         }
1239
1240         /* lv1ent_page(sent) == true here */
1241
1242         ent = page_entry(ent, iova);
1243
1244         if (unlikely(lv2ent_fault(ent))) {
1245                 size = SPAGE_SIZE;
1246                 goto done;
1247         }
1248
1249         if (lv2ent_small(ent)) {
1250                 exynos_iommu_set_pte(ent, 0);
1251                 size = SPAGE_SIZE;
1252                 domain->lv2entcnt[lv1ent_offset(iova)] += 1;
1253                 goto done;
1254         }
1255
1256         /* lv1ent_large(ent) == true here */
1257         if (WARN_ON(size < LPAGE_SIZE)) {
1258                 err_pgsize = LPAGE_SIZE;
1259                 goto err;
1260         }
1261
1262         dma_sync_single_for_cpu(dma_dev, virt_to_phys(ent),
1263                                 sizeof(*ent) * SPAGES_PER_LPAGE,
1264                                 DMA_TO_DEVICE);
1265         memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE);
1266         dma_sync_single_for_device(dma_dev, virt_to_phys(ent),
1267                                    sizeof(*ent) * SPAGES_PER_LPAGE,
1268                                    DMA_TO_DEVICE);
1269         size = LPAGE_SIZE;
1270         domain->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE;
1271 done:
1272         spin_unlock_irqrestore(&domain->pgtablelock, flags);
1273
1274         exynos_iommu_tlb_invalidate_entry(domain, iova, size);
1275
1276         return size;
1277 err:
1278         spin_unlock_irqrestore(&domain->pgtablelock, flags);
1279
1280         pr_err("%s: Failed: size(%#zx) @ %#x is smaller than page size %#zx\n",
1281                 __func__, size, iova, err_pgsize);
1282
1283         return 0;
1284 }
1285
1286 static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *iommu_domain,
1287                                           dma_addr_t iova)
1288 {
1289         struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain);
1290         sysmmu_pte_t *entry;
1291         unsigned long flags;
1292         phys_addr_t phys = 0;
1293
1294         spin_lock_irqsave(&domain->pgtablelock, flags);
1295
1296         entry = section_entry(domain->pgtable, iova);
1297
1298         if (lv1ent_section(entry)) {
1299                 phys = section_phys(entry) + section_offs(iova);
1300         } else if (lv1ent_page(entry)) {
1301                 entry = page_entry(entry, iova);
1302
1303                 if (lv2ent_large(entry))
1304                         phys = lpage_phys(entry) + lpage_offs(iova);
1305                 else if (lv2ent_small(entry))
1306                         phys = spage_phys(entry) + spage_offs(iova);
1307         }
1308
1309         spin_unlock_irqrestore(&domain->pgtablelock, flags);
1310
1311         return phys;
1312 }
1313
1314 static struct iommu_device *exynos_iommu_probe_device(struct device *dev)
1315 {
1316         struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
1317         struct sysmmu_drvdata *data;
1318
1319         if (!has_sysmmu(dev))
1320                 return ERR_PTR(-ENODEV);
1321
1322         list_for_each_entry(data, &owner->controllers, owner_node) {
1323                 /*
1324                  * SYSMMU will be runtime activated via device link
1325                  * (dependency) to its master device, so there are no
1326                  * direct calls to pm_runtime_get/put in this driver.
1327                  */
1328                 data->link = device_link_add(dev, data->sysmmu,
1329                                              DL_FLAG_STATELESS |
1330                                              DL_FLAG_PM_RUNTIME);
1331         }
1332
1333         /* There is always at least one entry, see exynos_iommu_of_xlate() */
1334         data = list_first_entry(&owner->controllers,
1335                                 struct sysmmu_drvdata, owner_node);
1336
1337         return &data->iommu;
1338 }
1339
1340 static void exynos_iommu_release_device(struct device *dev)
1341 {
1342         struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
1343         struct sysmmu_drvdata *data;
1344
1345         if (owner->domain) {
1346                 struct iommu_group *group = iommu_group_get(dev);
1347
1348                 if (group) {
1349                         WARN_ON(owner->domain !=
1350                                 iommu_group_default_domain(group));
1351                         exynos_iommu_detach_device(owner->domain, dev);
1352                         iommu_group_put(group);
1353                 }
1354         }
1355
1356         list_for_each_entry(data, &owner->controllers, owner_node)
1357                 device_link_del(data->link);
1358 }
1359
1360 static int exynos_iommu_of_xlate(struct device *dev,
1361                                  struct of_phandle_args *spec)
1362 {
1363         struct platform_device *sysmmu = of_find_device_by_node(spec->np);
1364         struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev);
1365         struct sysmmu_drvdata *data, *entry;
1366
1367         if (!sysmmu)
1368                 return -ENODEV;
1369
1370         data = platform_get_drvdata(sysmmu);
1371         if (!data) {
1372                 put_device(&sysmmu->dev);
1373                 return -ENODEV;
1374         }
1375
1376         if (!owner) {
1377                 owner = kzalloc(sizeof(*owner), GFP_KERNEL);
1378                 if (!owner) {
1379                         put_device(&sysmmu->dev);
1380                         return -ENOMEM;
1381                 }
1382
1383                 INIT_LIST_HEAD(&owner->controllers);
1384                 mutex_init(&owner->rpm_lock);
1385                 dev_iommu_priv_set(dev, owner);
1386         }
1387
1388         list_for_each_entry(entry, &owner->controllers, owner_node)
1389                 if (entry == data)
1390                         return 0;
1391
1392         list_add_tail(&data->owner_node, &owner->controllers);
1393         data->master = dev;
1394
1395         return 0;
1396 }
1397
1398 static const struct iommu_ops exynos_iommu_ops = {
1399         .domain_alloc = exynos_iommu_domain_alloc,
1400         .device_group = generic_device_group,
1401         .probe_device = exynos_iommu_probe_device,
1402         .release_device = exynos_iommu_release_device,
1403         .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,
1404         .of_xlate = exynos_iommu_of_xlate,
1405         .default_domain_ops = &(const struct iommu_domain_ops) {
1406                 .attach_dev     = exynos_iommu_attach_device,
1407                 .detach_dev     = exynos_iommu_detach_device,
1408                 .map            = exynos_iommu_map,
1409                 .unmap          = exynos_iommu_unmap,
1410                 .iova_to_phys   = exynos_iommu_iova_to_phys,
1411                 .free           = exynos_iommu_domain_free,
1412         }
1413 };
1414
1415 static int __init exynos_iommu_init(void)
1416 {
1417         struct device_node *np;
1418         int ret;
1419
1420         np = of_find_matching_node(NULL, sysmmu_of_match);
1421         if (!np)
1422                 return 0;
1423
1424         of_node_put(np);
1425
1426         lv2table_kmem_cache = kmem_cache_create("exynos-iommu-lv2table",
1427                                 LV2TABLE_SIZE, LV2TABLE_SIZE, 0, NULL);
1428         if (!lv2table_kmem_cache) {
1429                 pr_err("%s: Failed to create kmem cache\n", __func__);
1430                 return -ENOMEM;
1431         }
1432
1433         zero_lv2_table = kmem_cache_zalloc(lv2table_kmem_cache, GFP_KERNEL);
1434         if (zero_lv2_table == NULL) {
1435                 pr_err("%s: Failed to allocate zero level2 page table\n",
1436                         __func__);
1437                 ret = -ENOMEM;
1438                 goto err_zero_lv2;
1439         }
1440
1441         ret = platform_driver_register(&exynos_sysmmu_driver);
1442         if (ret) {
1443                 pr_err("%s: Failed to register driver\n", __func__);
1444                 goto err_reg_driver;
1445         }
1446
1447         return 0;
1448 err_reg_driver:
1449         platform_driver_unregister(&exynos_sysmmu_driver);
1450 err_zero_lv2:
1451         kmem_cache_destroy(lv2table_kmem_cache);
1452         return ret;
1453 }
1454 core_initcall(exynos_iommu_init);