linux/drivers/iommu/rockchip-iommu.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * IOMMU API for Rockchip
   4 *
   5 * Module Authors:      Simon Xue <xxm@rock-chips.com>
   6 *                      Daniel Kurtz <djkurtz@chromium.org>
   7 */
   8
   9#include <linux/clk.h>
  10#include <linux/compiler.h>
  11#include <linux/delay.h>
  12#include <linux/device.h>
  13#include <linux/dma-iommu.h>
  14#include <linux/dma-mapping.h>
  15#include <linux/errno.h>
  16#include <linux/interrupt.h>
  17#include <linux/io.h>
  18#include <linux/iommu.h>
  19#include <linux/iopoll.h>
  20#include <linux/list.h>
  21#include <linux/mm.h>
  22#include <linux/init.h>
  23#include <linux/of.h>
  24#include <linux/of_iommu.h>
  25#include <linux/of_platform.h>
  26#include <linux/platform_device.h>
  27#include <linux/pm_runtime.h>
  28#include <linux/slab.h>
  29#include <linux/spinlock.h>
  30
  31/** MMU register offsets */
  32#define RK_MMU_DTE_ADDR         0x00    /* Directory table address */
  33#define RK_MMU_STATUS           0x04
  34#define RK_MMU_COMMAND          0x08
  35#define RK_MMU_PAGE_FAULT_ADDR  0x0C    /* IOVA of last page fault */
  36#define RK_MMU_ZAP_ONE_LINE     0x10    /* Shootdown one IOTLB entry */
  37#define RK_MMU_INT_RAWSTAT      0x14    /* IRQ status ignoring mask */
  38#define RK_MMU_INT_CLEAR        0x18    /* Acknowledge and re-arm irq */
  39#define RK_MMU_INT_MASK         0x1C    /* IRQ enable */
  40#define RK_MMU_INT_STATUS       0x20    /* IRQ status after masking */
  41#define RK_MMU_AUTO_GATING      0x24
  42
  43#define DTE_ADDR_DUMMY          0xCAFEBABE
  44
  45#define RK_MMU_POLL_PERIOD_US           100
  46#define RK_MMU_FORCE_RESET_TIMEOUT_US   100000
  47#define RK_MMU_POLL_TIMEOUT_US          1000
  48
  49/* RK_MMU_STATUS fields */
  50#define RK_MMU_STATUS_PAGING_ENABLED       BIT(0)
  51#define RK_MMU_STATUS_PAGE_FAULT_ACTIVE    BIT(1)
  52#define RK_MMU_STATUS_STALL_ACTIVE         BIT(2)
  53#define RK_MMU_STATUS_IDLE                 BIT(3)
  54#define RK_MMU_STATUS_REPLAY_BUFFER_EMPTY  BIT(4)
  55#define RK_MMU_STATUS_PAGE_FAULT_IS_WRITE  BIT(5)
  56#define RK_MMU_STATUS_STALL_NOT_ACTIVE     BIT(31)
  57
  58/* RK_MMU_COMMAND command values */
  59#define RK_MMU_CMD_ENABLE_PAGING    0  /* Enable memory translation */
  60#define RK_MMU_CMD_DISABLE_PAGING   1  /* Disable memory translation */
  61#define RK_MMU_CMD_ENABLE_STALL     2  /* Stall paging to allow other cmds */
  62#define RK_MMU_CMD_DISABLE_STALL    3  /* Stop stall re-enables paging */
  63#define RK_MMU_CMD_ZAP_CACHE        4  /* Shoot down entire IOTLB */
  64#define RK_MMU_CMD_PAGE_FAULT_DONE  5  /* Clear page fault */
  65#define RK_MMU_CMD_FORCE_RESET      6  /* Reset all registers */
  66
  67/* RK_MMU_INT_* register fields */
  68#define RK_MMU_IRQ_PAGE_FAULT    0x01  /* page fault */
  69#define RK_MMU_IRQ_BUS_ERROR     0x02  /* bus read error */
  70#define RK_MMU_IRQ_MASK          (RK_MMU_IRQ_PAGE_FAULT | RK_MMU_IRQ_BUS_ERROR)
  71
  72#define NUM_DT_ENTRIES 1024
  73#define NUM_PT_ENTRIES 1024
  74
  75#define SPAGE_ORDER 12
  76#define SPAGE_SIZE (1 << SPAGE_ORDER)
  77
  78 /*
  79  * Support mapping any size that fits in one page table:
  80  *   4 KiB to 4 MiB
  81  */
  82#define RK_IOMMU_PGSIZE_BITMAP 0x007ff000
  83
  84struct rk_iommu_domain {
  85        struct list_head iommus;
  86        u32 *dt; /* page directory table */
  87        dma_addr_t dt_dma;
  88        spinlock_t iommus_lock; /* lock for iommus list */
  89        spinlock_t dt_lock; /* lock for modifying page directory table */
  90
  91        struct iommu_domain domain;
  92};
  93
  94/* list of clocks required by IOMMU */
  95static const char * const rk_iommu_clocks[] = {
  96        "aclk", "iface",
  97};
  98
  99struct rk_iommu {
 100        struct device *dev;
 101        void __iomem **bases;
 102        int num_mmu;
 103        int num_irq;
 104        struct clk_bulk_data *clocks;
 105        int num_clocks;
 106        bool reset_disabled;
 107        struct iommu_device iommu;
 108        struct list_head node; /* entry in rk_iommu_domain.iommus */
 109        struct iommu_domain *domain; /* domain to which iommu is attached */
 110        struct iommu_group *group;
 111};
 112
 113struct rk_iommudata {
 114        struct device_link *link; /* runtime PM link from IOMMU to master */
 115        struct rk_iommu *iommu;
 116};
 117
 118static struct device *dma_dev;
 119
 120static inline void rk_table_flush(struct rk_iommu_domain *dom, dma_addr_t dma,
 121                                  unsigned int count)
 122{
 123        size_t size = count * sizeof(u32); /* count of u32 entry */
 124
 125        dma_sync_single_for_device(dma_dev, dma, size, DMA_TO_DEVICE);
 126}
 127
 128static struct rk_iommu_domain *to_rk_domain(struct iommu_domain *dom)
 129{
 130        return container_of(dom, struct rk_iommu_domain, domain);
 131}
 132
 133/*
 134 * The Rockchip rk3288 iommu uses a 2-level page table.
 135 * The first level is the "Directory Table" (DT).
 136 * The DT consists of 1024 4-byte Directory Table Entries (DTEs), each pointing
 137 * to a "Page Table".
 138 * The second level is the 1024 Page Tables (PT).
 139 * Each PT consists of 1024 4-byte Page Table Entries (PTEs), each pointing to
 140 * a 4 KB page of physical memory.
 141 *
 142 * The DT and each PT fits in a single 4 KB page (4-bytes * 1024 entries).
 143 * Each iommu device has a MMU_DTE_ADDR register that contains the physical
 144 * address of the start of the DT page.
 145 *
 146 * The structure of the page table is as follows:
 147 *
 148 *                   DT
 149 * MMU_DTE_ADDR -> +-----+
 150 *                 |     |
 151 *                 +-----+     PT
 152 *                 | DTE | -> +-----+
 153 *                 +-----+    |     |     Memory
 154 *                 |     |    +-----+     Page
 155 *                 |     |    | PTE | -> +-----+
 156 *                 +-----+    +-----+    |     |
 157 *                            |     |    |     |
 158 *                            |     |    |     |
 159 *                            +-----+    |     |
 160 *                                       |     |
 161 *                                       |     |
 162 *                                       +-----+
 163 */
 164
 165/*
 166 * Each DTE has a PT address and a valid bit:
 167 * +---------------------+-----------+-+
 168 * | PT address          | Reserved  |V|
 169 * +---------------------+-----------+-+
 170 *  31:12 - PT address (PTs always starts on a 4 KB boundary)
 171 *  11: 1 - Reserved
 172 *      0 - 1 if PT @ PT address is valid
 173 */
 174#define RK_DTE_PT_ADDRESS_MASK    0xfffff000
 175#define RK_DTE_PT_VALID           BIT(0)
 176
 177static inline phys_addr_t rk_dte_pt_address(u32 dte)
 178{
 179        return (phys_addr_t)dte & RK_DTE_PT_ADDRESS_MASK;
 180}
 181
 182static inline bool rk_dte_is_pt_valid(u32 dte)
 183{
 184        return dte & RK_DTE_PT_VALID;
 185}
 186
 187static inline u32 rk_mk_dte(dma_addr_t pt_dma)
 188{
 189        return (pt_dma & RK_DTE_PT_ADDRESS_MASK) | RK_DTE_PT_VALID;
 190}
 191
 192/*
 193 * Each PTE has a Page address, some flags and a valid bit:
 194 * +---------------------+---+-------+-+
 195 * | Page address        |Rsv| Flags |V|
 196 * +---------------------+---+-------+-+
 197 *  31:12 - Page address (Pages always start on a 4 KB boundary)
 198 *  11: 9 - Reserved
 199 *   8: 1 - Flags
 200 *      8 - Read allocate - allocate cache space on read misses
 201 *      7 - Read cache - enable cache & prefetch of data
 202 *      6 - Write buffer - enable delaying writes on their way to memory
 203 *      5 - Write allocate - allocate cache space on write misses
 204 *      4 - Write cache - different writes can be merged together
 205 *      3 - Override cache attributes
 206 *          if 1, bits 4-8 control cache attributes
 207 *          if 0, the system bus defaults are used
 208 *      2 - Writable
 209 *      1 - Readable
 210 *      0 - 1 if Page @ Page address is valid
 211 */
 212#define RK_PTE_PAGE_ADDRESS_MASK  0xfffff000
 213#define RK_PTE_PAGE_FLAGS_MASK    0x000001fe
 214#define RK_PTE_PAGE_WRITABLE      BIT(2)
 215#define RK_PTE_PAGE_READABLE      BIT(1)
 216#define RK_PTE_PAGE_VALID         BIT(0)
 217
 218static inline phys_addr_t rk_pte_page_address(u32 pte)
 219{
 220        return (phys_addr_t)pte & RK_PTE_PAGE_ADDRESS_MASK;
 221}
 222
 223static inline bool rk_pte_is_page_valid(u32 pte)
 224{
 225        return pte & RK_PTE_PAGE_VALID;
 226}
 227
 228/* TODO: set cache flags per prot IOMMU_CACHE */
 229static u32 rk_mk_pte(phys_addr_t page, int prot)
 230{
 231        u32 flags = 0;
 232        flags |= (prot & IOMMU_READ) ? RK_PTE_PAGE_READABLE : 0;
 233        flags |= (prot & IOMMU_WRITE) ? RK_PTE_PAGE_WRITABLE : 0;
 234        page &= RK_PTE_PAGE_ADDRESS_MASK;
 235        return page | flags | RK_PTE_PAGE_VALID;
 236}
 237
 238static u32 rk_mk_pte_invalid(u32 pte)
 239{
 240        return pte & ~RK_PTE_PAGE_VALID;
 241}
 242
 243/*
 244 * rk3288 iova (IOMMU Virtual Address) format
 245 *  31       22.21       12.11          0
 246 * +-----------+-----------+-------------+
 247 * | DTE index | PTE index | Page offset |
 248 * +-----------+-----------+-------------+
 249 *  31:22 - DTE index   - index of DTE in DT
 250 *  21:12 - PTE index   - index of PTE in PT @ DTE.pt_address
 251 *  11: 0 - Page offset - offset into page @ PTE.page_address
 252 */
 253#define RK_IOVA_DTE_MASK    0xffc00000
 254#define RK_IOVA_DTE_SHIFT   22
 255#define RK_IOVA_PTE_MASK    0x003ff000
 256#define RK_IOVA_PTE_SHIFT   12
 257#define RK_IOVA_PAGE_MASK   0x00000fff
 258#define RK_IOVA_PAGE_SHIFT  0
 259
 260static u32 rk_iova_dte_index(dma_addr_t iova)
 261{
 262        return (u32)(iova & RK_IOVA_DTE_MASK) >> RK_IOVA_DTE_SHIFT;
 263}
 264
 265static u32 rk_iova_pte_index(dma_addr_t iova)
 266{
 267        return (u32)(iova & RK_IOVA_PTE_MASK) >> RK_IOVA_PTE_SHIFT;
 268}
 269
 270static u32 rk_iova_page_offset(dma_addr_t iova)
 271{
 272        return (u32)(iova & RK_IOVA_PAGE_MASK) >> RK_IOVA_PAGE_SHIFT;
 273}
 274
 275static u32 rk_iommu_read(void __iomem *base, u32 offset)
 276{
 277        return readl(base + offset);
 278}
 279
 280static void rk_iommu_write(void __iomem *base, u32 offset, u32 value)
 281{
 282        writel(value, base + offset);
 283}
 284
 285static void rk_iommu_command(struct rk_iommu *iommu, u32 command)
 286{
 287        int i;
 288
 289        for (i = 0; i < iommu->num_mmu; i++)
 290                writel(command, iommu->bases[i] + RK_MMU_COMMAND);
 291}
 292
 293static void rk_iommu_base_command(void __iomem *base, u32 command)
 294{
 295        writel(command, base + RK_MMU_COMMAND);
 296}
 297static void rk_iommu_zap_lines(struct rk_iommu *iommu, dma_addr_t iova_start,
 298                               size_t size)
 299{
 300        int i;
 301        dma_addr_t iova_end = iova_start + size;
 302        /*
 303         * TODO(djkurtz): Figure out when it is more efficient to shootdown the
 304         * entire iotlb rather than iterate over individual iovas.
 305         */
 306        for (i = 0; i < iommu->num_mmu; i++) {
 307                dma_addr_t iova;
 308
 309                for (iova = iova_start; iova < iova_end; iova += SPAGE_SIZE)
 310                        rk_iommu_write(iommu->bases[i], RK_MMU_ZAP_ONE_LINE, iova);
 311        }
 312}
 313
 314static bool rk_iommu_is_stall_active(struct rk_iommu *iommu)
 315{
 316        bool active = true;
 317        int i;
 318
 319        for (i = 0; i < iommu->num_mmu; i++)
 320                active &= !!(rk_iommu_read(iommu->bases[i], RK_MMU_STATUS) &
 321                                           RK_MMU_STATUS_STALL_ACTIVE);
 322
 323        return active;
 324}
 325
 326static bool rk_iommu_is_paging_enabled(struct rk_iommu *iommu)
 327{
 328        bool enable = true;
 329        int i;
 330
 331        for (i = 0; i < iommu->num_mmu; i++)
 332                enable &= !!(rk_iommu_read(iommu->bases[i], RK_MMU_STATUS) &
 333                                           RK_MMU_STATUS_PAGING_ENABLED);
 334
 335        return enable;
 336}
 337
 338static bool rk_iommu_is_reset_done(struct rk_iommu *iommu)
 339{
 340        bool done = true;
 341        int i;
 342
 343        for (i = 0; i < iommu->num_mmu; i++)
 344                done &= rk_iommu_read(iommu->bases[i], RK_MMU_DTE_ADDR) == 0;
 345
 346        return done;
 347}
 348
 349static int rk_iommu_enable_stall(struct rk_iommu *iommu)
 350{
 351        int ret, i;
 352        bool val;
 353
 354        if (rk_iommu_is_stall_active(iommu))
 355                return 0;
 356
 357        /* Stall can only be enabled if paging is enabled */
 358        if (!rk_iommu_is_paging_enabled(iommu))
 359                return 0;
 360
 361        rk_iommu_command(iommu, RK_MMU_CMD_ENABLE_STALL);
 362
 363        ret = readx_poll_timeout(rk_iommu_is_stall_active, iommu, val,
 364                                 val, RK_MMU_POLL_PERIOD_US,
 365                                 RK_MMU_POLL_TIMEOUT_US);
 366        if (ret)
 367                for (i = 0; i < iommu->num_mmu; i++)
 368                        dev_err(iommu->dev, "Enable stall request timed out, status: %#08x\n",
 369                                rk_iommu_read(iommu->bases[i], RK_MMU_STATUS));
 370
 371        return ret;
 372}
 373
 374static int rk_iommu_disable_stall(struct rk_iommu *iommu)
 375{
 376        int ret, i;
 377        bool val;
 378
 379        if (!rk_iommu_is_stall_active(iommu))
 380                return 0;
 381
 382        rk_iommu_command(iommu, RK_MMU_CMD_DISABLE_STALL);
 383
 384        ret = readx_poll_timeout(rk_iommu_is_stall_active, iommu, val,
 385                                 !val, RK_MMU_POLL_PERIOD_US,
 386                                 RK_MMU_POLL_TIMEOUT_US);
 387        if (ret)
 388                for (i = 0; i < iommu->num_mmu; i++)
 389                        dev_err(iommu->dev, "Disable stall request timed out, status: %#08x\n",
 390                                rk_iommu_read(iommu->bases[i], RK_MMU_STATUS));
 391
 392        return ret;
 393}
 394
 395static int rk_iommu_enable_paging(struct rk_iommu *iommu)
 396{
 397        int ret, i;
 398        bool val;
 399
 400        if (rk_iommu_is_paging_enabled(iommu))
 401                return 0;
 402
 403        rk_iommu_command(iommu, RK_MMU_CMD_ENABLE_PAGING);
 404
 405        ret = readx_poll_timeout(rk_iommu_is_paging_enabled, iommu, val,
 406                                 val, RK_MMU_POLL_PERIOD_US,
 407                                 RK_MMU_POLL_TIMEOUT_US);
 408        if (ret)
 409                for (i = 0; i < iommu->num_mmu; i++)
 410                        dev_err(iommu->dev, "Enable paging request timed out, status: %#08x\n",
 411                                rk_iommu_read(iommu->bases[i], RK_MMU_STATUS));
 412
 413        return ret;
 414}
 415
 416static int rk_iommu_disable_paging(struct rk_iommu *iommu)
 417{
 418        int ret, i;
 419        bool val;
 420
 421        if (!rk_iommu_is_paging_enabled(iommu))
 422                return 0;
 423
 424        rk_iommu_command(iommu, RK_MMU_CMD_DISABLE_PAGING);
 425
 426        ret = readx_poll_timeout(rk_iommu_is_paging_enabled, iommu, val,
 427                                 !val, RK_MMU_POLL_PERIOD_US,
 428                                 RK_MMU_POLL_TIMEOUT_US);
 429        if (ret)
 430                for (i = 0; i < iommu->num_mmu; i++)
 431                        dev_err(iommu->dev, "Disable paging request timed out, status: %#08x\n",
 432                                rk_iommu_read(iommu->bases[i], RK_MMU_STATUS));
 433
 434        return ret;
 435}
 436
 437static int rk_iommu_force_reset(struct rk_iommu *iommu)
 438{
 439        int ret, i;
 440        u32 dte_addr;
 441        bool val;
 442
 443        if (iommu->reset_disabled)
 444                return 0;
 445
 446        /*
 447         * Check if register DTE_ADDR is working by writing DTE_ADDR_DUMMY
 448         * and verifying that upper 5 nybbles are read back.
 449         */
 450        for (i = 0; i < iommu->num_mmu; i++) {
 451                rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, DTE_ADDR_DUMMY);
 452
 453                dte_addr = rk_iommu_read(iommu->bases[i], RK_MMU_DTE_ADDR);
 454                if (dte_addr != (DTE_ADDR_DUMMY & RK_DTE_PT_ADDRESS_MASK)) {
 455                        dev_err(iommu->dev, "Error during raw reset. MMU_DTE_ADDR is not functioning\n");
 456                        return -EFAULT;
 457                }
 458        }
 459
 460        rk_iommu_command(iommu, RK_MMU_CMD_FORCE_RESET);
 461
 462        ret = readx_poll_timeout(rk_iommu_is_reset_done, iommu, val,
 463                                 val, RK_MMU_FORCE_RESET_TIMEOUT_US,
 464                                 RK_MMU_POLL_TIMEOUT_US);
 465        if (ret) {
 466                dev_err(iommu->dev, "FORCE_RESET command timed out\n");
 467                return ret;
 468        }
 469
 470        return 0;
 471}
 472
 473static void log_iova(struct rk_iommu *iommu, int index, dma_addr_t iova)
 474{
 475        void __iomem *base = iommu->bases[index];
 476        u32 dte_index, pte_index, page_offset;
 477        u32 mmu_dte_addr;
 478        phys_addr_t mmu_dte_addr_phys, dte_addr_phys;
 479        u32 *dte_addr;
 480        u32 dte;
 481        phys_addr_t pte_addr_phys = 0;
 482        u32 *pte_addr = NULL;
 483        u32 pte = 0;
 484        phys_addr_t page_addr_phys = 0;
 485        u32 page_flags = 0;
 486
 487        dte_index = rk_iova_dte_index(iova);
 488        pte_index = rk_iova_pte_index(iova);
 489        page_offset = rk_iova_page_offset(iova);
 490
 491        mmu_dte_addr = rk_iommu_read(base, RK_MMU_DTE_ADDR);
 492        mmu_dte_addr_phys = (phys_addr_t)mmu_dte_addr;
 493
 494        dte_addr_phys = mmu_dte_addr_phys + (4 * dte_index);
 495        dte_addr = phys_to_virt(dte_addr_phys);
 496        dte = *dte_addr;
 497
 498        if (!rk_dte_is_pt_valid(dte))
 499                goto print_it;
 500
 501        pte_addr_phys = rk_dte_pt_address(dte) + (pte_index * 4);
 502        pte_addr = phys_to_virt(pte_addr_phys);
 503        pte = *pte_addr;
 504
 505        if (!rk_pte_is_page_valid(pte))
 506                goto print_it;
 507
 508        page_addr_phys = rk_pte_page_address(pte) + page_offset;
 509        page_flags = pte & RK_PTE_PAGE_FLAGS_MASK;
 510
 511print_it:
 512        dev_err(iommu->dev, "iova = %pad: dte_index: %#03x pte_index: %#03x page_offset: %#03x\n",
 513                &iova, dte_index, pte_index, page_offset);
 514        dev_err(iommu->dev, "mmu_dte_addr: %pa dte@%pa: %#08x valid: %u pte@%pa: %#08x valid: %u page@%pa flags: %#03x\n",
 515                &mmu_dte_addr_phys, &dte_addr_phys, dte,
 516                rk_dte_is_pt_valid(dte), &pte_addr_phys, pte,
 517                rk_pte_is_page_valid(pte), &page_addr_phys, page_flags);
 518}
 519
 520static irqreturn_t rk_iommu_irq(int irq, void *dev_id)
 521{
 522        struct rk_iommu *iommu = dev_id;
 523        u32 status;
 524        u32 int_status;
 525        dma_addr_t iova;
 526        irqreturn_t ret = IRQ_NONE;
 527        int i, err;
 528
 529        err = pm_runtime_get_if_in_use(iommu->dev);
 530        if (!err || WARN_ON_ONCE(err < 0))
 531                return ret;
 532
 533        if (WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks)))
 534                goto out;
 535
 536        for (i = 0; i < iommu->num_mmu; i++) {
 537                int_status = rk_iommu_read(iommu->bases[i], RK_MMU_INT_STATUS);
 538                if (int_status == 0)
 539                        continue;
 540
 541                ret = IRQ_HANDLED;
 542                iova = rk_iommu_read(iommu->bases[i], RK_MMU_PAGE_FAULT_ADDR);
 543
 544                if (int_status & RK_MMU_IRQ_PAGE_FAULT) {
 545                        int flags;
 546
 547                        status = rk_iommu_read(iommu->bases[i], RK_MMU_STATUS);
 548                        flags = (status & RK_MMU_STATUS_PAGE_FAULT_IS_WRITE) ?
 549                                        IOMMU_FAULT_WRITE : IOMMU_FAULT_READ;
 550
 551                        dev_err(iommu->dev, "Page fault at %pad of type %s\n",
 552                                &iova,
 553                                (flags == IOMMU_FAULT_WRITE) ? "write" : "read");
 554
 555                        log_iova(iommu, i, iova);
 556
 557                        /*
 558                         * Report page fault to any installed handlers.
 559                         * Ignore the return code, though, since we always zap cache
 560                         * and clear the page fault anyway.
 561                         */
 562                        if (iommu->domain)
 563                                report_iommu_fault(iommu->domain, iommu->dev, iova,
 564                                                   flags);
 565                        else
 566                                dev_err(iommu->dev, "Page fault while iommu not attached to domain?\n");
 567
 568                        rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_ZAP_CACHE);
 569                        rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_PAGE_FAULT_DONE);
 570                }
 571
 572                if (int_status & RK_MMU_IRQ_BUS_ERROR)
 573                        dev_err(iommu->dev, "BUS_ERROR occurred at %pad\n", &iova);
 574
 575                if (int_status & ~RK_MMU_IRQ_MASK)
 576                        dev_err(iommu->dev, "unexpected int_status: %#08x\n",
 577                                int_status);
 578
 579                rk_iommu_write(iommu->bases[i], RK_MMU_INT_CLEAR, int_status);
 580        }
 581
 582        clk_bulk_disable(iommu->num_clocks, iommu->clocks);
 583
 584out:
 585        pm_runtime_put(iommu->dev);
 586        return ret;
 587}
 588
 589static phys_addr_t rk_iommu_iova_to_phys(struct iommu_domain *domain,
 590                                         dma_addr_t iova)
 591{
 592        struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
 593        unsigned long flags;
 594        phys_addr_t pt_phys, phys = 0;
 595        u32 dte, pte;
 596        u32 *page_table;
 597
 598        spin_lock_irqsave(&rk_domain->dt_lock, flags);
 599
 600        dte = rk_domain->dt[rk_iova_dte_index(iova)];
 601        if (!rk_dte_is_pt_valid(dte))
 602                goto out;
 603
 604        pt_phys = rk_dte_pt_address(dte);
 605        page_table = (u32 *)phys_to_virt(pt_phys);
 606        pte = page_table[rk_iova_pte_index(iova)];
 607        if (!rk_pte_is_page_valid(pte))
 608                goto out;
 609
 610        phys = rk_pte_page_address(pte) + rk_iova_page_offset(iova);
 611out:
 612        spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
 613
 614        return phys;
 615}
 616
 617static void rk_iommu_zap_iova(struct rk_iommu_domain *rk_domain,
 618                              dma_addr_t iova, size_t size)
 619{
 620        struct list_head *pos;
 621        unsigned long flags;
 622
 623        /* shootdown these iova from all iommus using this domain */
 624        spin_lock_irqsave(&rk_domain->iommus_lock, flags);
 625        list_for_each(pos, &rk_domain->iommus) {
 626                struct rk_iommu *iommu;
 627                int ret;
 628
 629                iommu = list_entry(pos, struct rk_iommu, node);
 630
 631                /* Only zap TLBs of IOMMUs that are powered on. */
 632                ret = pm_runtime_get_if_in_use(iommu->dev);
 633                if (WARN_ON_ONCE(ret < 0))
 634                        continue;
 635                if (ret) {
 636                        WARN_ON(clk_bulk_enable(iommu->num_clocks,
 637                                                iommu->clocks));
 638                        rk_iommu_zap_lines(iommu, iova, size);
 639                        clk_bulk_disable(iommu->num_clocks, iommu->clocks);
 640                        pm_runtime_put(iommu->dev);
 641                }
 642        }
 643        spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
 644}
 645
 646static void rk_iommu_zap_iova_first_last(struct rk_iommu_domain *rk_domain,
 647                                         dma_addr_t iova, size_t size)
 648{
 649        rk_iommu_zap_iova(rk_domain, iova, SPAGE_SIZE);
 650        if (size > SPAGE_SIZE)
 651                rk_iommu_zap_iova(rk_domain, iova + size - SPAGE_SIZE,
 652                                        SPAGE_SIZE);
 653}
 654
 655static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain,
 656                                  dma_addr_t iova)
 657{
 658        u32 *page_table, *dte_addr;
 659        u32 dte_index, dte;
 660        phys_addr_t pt_phys;
 661        dma_addr_t pt_dma;
 662
 663        assert_spin_locked(&rk_domain->dt_lock);
 664
 665        dte_index = rk_iova_dte_index(iova);
 666        dte_addr = &rk_domain->dt[dte_index];
 667        dte = *dte_addr;
 668        if (rk_dte_is_pt_valid(dte))
 669                goto done;
 670
 671        page_table = (u32 *)get_zeroed_page(GFP_ATOMIC | GFP_DMA32);
 672        if (!page_table)
 673                return ERR_PTR(-ENOMEM);
 674
 675        pt_dma = dma_map_single(dma_dev, page_table, SPAGE_SIZE, DMA_TO_DEVICE);
 676        if (dma_mapping_error(dma_dev, pt_dma)) {
 677                dev_err(dma_dev, "DMA mapping error while allocating page table\n");
 678                free_page((unsigned long)page_table);
 679                return ERR_PTR(-ENOMEM);
 680        }
 681
 682        dte = rk_mk_dte(pt_dma);
 683        *dte_addr = dte;
 684
 685        rk_table_flush(rk_domain, pt_dma, NUM_PT_ENTRIES);
 686        rk_table_flush(rk_domain,
 687                       rk_domain->dt_dma + dte_index * sizeof(u32), 1);
 688done:
 689        pt_phys = rk_dte_pt_address(dte);
 690        return (u32 *)phys_to_virt(pt_phys);
 691}
 692
 693static size_t rk_iommu_unmap_iova(struct rk_iommu_domain *rk_domain,
 694                                  u32 *pte_addr, dma_addr_t pte_dma,
 695                                  size_t size)
 696{
 697        unsigned int pte_count;
 698        unsigned int pte_total = size / SPAGE_SIZE;
 699
 700        assert_spin_locked(&rk_domain->dt_lock);
 701
 702        for (pte_count = 0; pte_count < pte_total; pte_count++) {
 703                u32 pte = pte_addr[pte_count];
 704                if (!rk_pte_is_page_valid(pte))
 705                        break;
 706
 707                pte_addr[pte_count] = rk_mk_pte_invalid(pte);
 708        }
 709
 710        rk_table_flush(rk_domain, pte_dma, pte_count);
 711
 712        return pte_count * SPAGE_SIZE;
 713}
 714
 715static int rk_iommu_map_iova(struct rk_iommu_domain *rk_domain, u32 *pte_addr,
 716                             dma_addr_t pte_dma, dma_addr_t iova,
 717                             phys_addr_t paddr, size_t size, int prot)
 718{
 719        unsigned int pte_count;
 720        unsigned int pte_total = size / SPAGE_SIZE;
 721        phys_addr_t page_phys;
 722
 723        assert_spin_locked(&rk_domain->dt_lock);
 724
 725        for (pte_count = 0; pte_count < pte_total; pte_count++) {
 726                u32 pte = pte_addr[pte_count];
 727
 728                if (rk_pte_is_page_valid(pte))
 729                        goto unwind;
 730
 731                pte_addr[pte_count] = rk_mk_pte(paddr, prot);
 732
 733                paddr += SPAGE_SIZE;
 734        }
 735
 736        rk_table_flush(rk_domain, pte_dma, pte_total);
 737
 738        /*
 739         * Zap the first and last iova to evict from iotlb any previously
 740         * mapped cachelines holding stale values for its dte and pte.
 741         * We only zap the first and last iova, since only they could have
 742         * dte or pte shared with an existing mapping.
 743         */
 744        rk_iommu_zap_iova_first_last(rk_domain, iova, size);
 745
 746        return 0;
 747unwind:
 748        /* Unmap the range of iovas that we just mapped */
 749        rk_iommu_unmap_iova(rk_domain, pte_addr, pte_dma,
 750                            pte_count * SPAGE_SIZE);
 751
 752        iova += pte_count * SPAGE_SIZE;
 753        page_phys = rk_pte_page_address(pte_addr[pte_count]);
 754        pr_err("iova: %pad already mapped to %pa cannot remap to phys: %pa prot: %#x\n",
 755               &iova, &page_phys, &paddr, prot);
 756
 757        return -EADDRINUSE;
 758}
 759
 760static int rk_iommu_map(struct iommu_domain *domain, unsigned long _iova,
 761                        phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
 762{
 763        struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
 764        unsigned long flags;
 765        dma_addr_t pte_dma, iova = (dma_addr_t)_iova;
 766        u32 *page_table, *pte_addr;
 767        u32 dte_index, pte_index;
 768        int ret;
 769
 770        spin_lock_irqsave(&rk_domain->dt_lock, flags);
 771
 772        /*
 773         * pgsize_bitmap specifies iova sizes that fit in one page table
 774         * (1024 4-KiB pages = 4 MiB).
 775         * So, size will always be 4096 <= size <= 4194304.
 776         * Since iommu_map() guarantees that both iova and size will be
 777         * aligned, we will always only be mapping from a single dte here.
 778         */
 779        page_table = rk_dte_get_page_table(rk_domain, iova);
 780        if (IS_ERR(page_table)) {
 781                spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
 782                return PTR_ERR(page_table);
 783        }
 784
 785        dte_index = rk_domain->dt[rk_iova_dte_index(iova)];
 786        pte_index = rk_iova_pte_index(iova);
 787        pte_addr = &page_table[pte_index];
 788        pte_dma = rk_dte_pt_address(dte_index) + pte_index * sizeof(u32);
 789        ret = rk_iommu_map_iova(rk_domain, pte_addr, pte_dma, iova,
 790                                paddr, size, prot);
 791
 792        spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
 793
 794        return ret;
 795}
 796
 797static size_t rk_iommu_unmap(struct iommu_domain *domain, unsigned long _iova,
 798                             size_t size, struct iommu_iotlb_gather *gather)
 799{
 800        struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
 801        unsigned long flags;
 802        dma_addr_t pte_dma, iova = (dma_addr_t)_iova;
 803        phys_addr_t pt_phys;
 804        u32 dte;
 805        u32 *pte_addr;
 806        size_t unmap_size;
 807
 808        spin_lock_irqsave(&rk_domain->dt_lock, flags);
 809
 810        /*
 811         * pgsize_bitmap specifies iova sizes that fit in one page table
 812         * (1024 4-KiB pages = 4 MiB).
 813         * So, size will always be 4096 <= size <= 4194304.
 814         * Since iommu_unmap() guarantees that both iova and size will be
 815         * aligned, we will always only be unmapping from a single dte here.
 816         */
 817        dte = rk_domain->dt[rk_iova_dte_index(iova)];
 818        /* Just return 0 if iova is unmapped */
 819        if (!rk_dte_is_pt_valid(dte)) {
 820                spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
 821                return 0;
 822        }
 823
 824        pt_phys = rk_dte_pt_address(dte);
 825        pte_addr = (u32 *)phys_to_virt(pt_phys) + rk_iova_pte_index(iova);
 826        pte_dma = pt_phys + rk_iova_pte_index(iova) * sizeof(u32);
 827        unmap_size = rk_iommu_unmap_iova(rk_domain, pte_addr, pte_dma, size);
 828
 829        spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
 830
 831        /* Shootdown iotlb entries for iova range that was just unmapped */
 832        rk_iommu_zap_iova(rk_domain, iova, unmap_size);
 833
 834        return unmap_size;
 835}
 836
 837static struct rk_iommu *rk_iommu_from_dev(struct device *dev)
 838{
 839        struct rk_iommudata *data = dev_iommu_priv_get(dev);
 840
 841        return data ? data->iommu : NULL;
 842}
 843
 844/* Must be called with iommu powered on and attached */
 845static void rk_iommu_disable(struct rk_iommu *iommu)
 846{
 847        int i;
 848
 849        /* Ignore error while disabling, just keep going */
 850        WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks));
 851        rk_iommu_enable_stall(iommu);
 852        rk_iommu_disable_paging(iommu);
 853        for (i = 0; i < iommu->num_mmu; i++) {
 854                rk_iommu_write(iommu->bases[i], RK_MMU_INT_MASK, 0);
 855                rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, 0);
 856        }
 857        rk_iommu_disable_stall(iommu);
 858        clk_bulk_disable(iommu->num_clocks, iommu->clocks);
 859}
 860
 861/* Must be called with iommu powered on and attached */
 862static int rk_iommu_enable(struct rk_iommu *iommu)
 863{
 864        struct iommu_domain *domain = iommu->domain;
 865        struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
 866        int ret, i;
 867
 868        ret = clk_bulk_enable(iommu->num_clocks, iommu->clocks);
 869        if (ret)
 870                return ret;
 871
 872        ret = rk_iommu_enable_stall(iommu);
 873        if (ret)
 874                goto out_disable_clocks;
 875
 876        ret = rk_iommu_force_reset(iommu);
 877        if (ret)
 878                goto out_disable_stall;
 879
 880        for (i = 0; i < iommu->num_mmu; i++) {
 881                rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR,
 882                               rk_domain->dt_dma);
 883                rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_ZAP_CACHE);
 884                rk_iommu_write(iommu->bases[i], RK_MMU_INT_MASK, RK_MMU_IRQ_MASK);
 885        }
 886
 887        ret = rk_iommu_enable_paging(iommu);
 888
 889out_disable_stall:
 890        rk_iommu_disable_stall(iommu);
 891out_disable_clocks:
 892        clk_bulk_disable(iommu->num_clocks, iommu->clocks);
 893        return ret;
 894}
 895
 896static void rk_iommu_detach_device(struct iommu_domain *domain,
 897                                   struct device *dev)
 898{
 899        struct rk_iommu *iommu;
 900        struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
 901        unsigned long flags;
 902        int ret;
 903
 904        /* Allow 'virtual devices' (eg drm) to detach from domain */
 905        iommu = rk_iommu_from_dev(dev);
 906        if (!iommu)
 907                return;
 908
 909        dev_dbg(dev, "Detaching from iommu domain\n");
 910
 911        /* iommu already detached */
 912        if (iommu->domain != domain)
 913                return;
 914
 915        iommu->domain = NULL;
 916
 917        spin_lock_irqsave(&rk_domain->iommus_lock, flags);
 918        list_del_init(&iommu->node);
 919        spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
 920
 921        ret = pm_runtime_get_if_in_use(iommu->dev);
 922        WARN_ON_ONCE(ret < 0);
 923        if (ret > 0) {
 924                rk_iommu_disable(iommu);
 925                pm_runtime_put(iommu->dev);
 926        }
 927}
 928
 929static int rk_iommu_attach_device(struct iommu_domain *domain,
 930                struct device *dev)
 931{
 932        struct rk_iommu *iommu;
 933        struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
 934        unsigned long flags;
 935        int ret;
 936
 937        /*
 938         * Allow 'virtual devices' (e.g., drm) to attach to domain.
 939         * Such a device does not belong to an iommu group.
 940         */
 941        iommu = rk_iommu_from_dev(dev);
 942        if (!iommu)
 943                return 0;
 944
 945        dev_dbg(dev, "Attaching to iommu domain\n");
 946
 947        /* iommu already attached */
 948        if (iommu->domain == domain)
 949                return 0;
 950
 951        if (iommu->domain)
 952                rk_iommu_detach_device(iommu->domain, dev);
 953
 954        iommu->domain = domain;
 955
 956        spin_lock_irqsave(&rk_domain->iommus_lock, flags);
 957        list_add_tail(&iommu->node, &rk_domain->iommus);
 958        spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
 959
 960        ret = pm_runtime_get_if_in_use(iommu->dev);
 961        if (!ret || WARN_ON_ONCE(ret < 0))
 962                return 0;
 963
 964        ret = rk_iommu_enable(iommu);
 965        if (ret)
 966                rk_iommu_detach_device(iommu->domain, dev);
 967
 968        pm_runtime_put(iommu->dev);
 969
 970        return ret;
 971}
 972
 973static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
 974{
 975        struct rk_iommu_domain *rk_domain;
 976
 977        if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
 978                return NULL;
 979
 980        if (!dma_dev)
 981                return NULL;
 982
 983        rk_domain = kzalloc(sizeof(*rk_domain), GFP_KERNEL);
 984        if (!rk_domain)
 985                return NULL;
 986
 987        if (type == IOMMU_DOMAIN_DMA &&
 988            iommu_get_dma_cookie(&rk_domain->domain))
 989                goto err_free_domain;
 990
 991        /*
 992         * rk32xx iommus use a 2 level pagetable.
 993         * Each level1 (dt) and level2 (pt) table has 1024 4-byte entries.
 994         * Allocate one 4 KiB page for each table.
 995         */
 996        rk_domain->dt = (u32 *)get_zeroed_page(GFP_KERNEL | GFP_DMA32);
 997        if (!rk_domain->dt)
 998                goto err_put_cookie;
 999
1000        rk_domain->dt_dma = dma_map_single(dma_dev, rk_domain->dt,
1001                                           SPAGE_SIZE, DMA_TO_DEVICE);
1002        if (dma_mapping_error(dma_dev, rk_domain->dt_dma)) {
1003                dev_err(dma_dev, "DMA map error for DT\n");
1004                goto err_free_dt;
1005        }
1006
1007        rk_table_flush(rk_domain, rk_domain->dt_dma, NUM_DT_ENTRIES);
1008
1009        spin_lock_init(&rk_domain->iommus_lock);
1010        spin_lock_init(&rk_domain->dt_lock);
1011        INIT_LIST_HEAD(&rk_domain->iommus);
1012
1013        rk_domain->domain.geometry.aperture_start = 0;
1014        rk_domain->domain.geometry.aperture_end   = DMA_BIT_MASK(32);
1015        rk_domain->domain.geometry.force_aperture = true;
1016
1017        return &rk_domain->domain;
1018
1019err_free_dt:
1020        free_page((unsigned long)rk_domain->dt);
1021err_put_cookie:
1022        if (type == IOMMU_DOMAIN_DMA)
1023                iommu_put_dma_cookie(&rk_domain->domain);
1024err_free_domain:
1025        kfree(rk_domain);
1026
1027        return NULL;
1028}
1029
1030static void rk_iommu_domain_free(struct iommu_domain *domain)
1031{
1032        struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
1033        int i;
1034
1035        WARN_ON(!list_empty(&rk_domain->iommus));
1036
1037        for (i = 0; i < NUM_DT_ENTRIES; i++) {
1038                u32 dte = rk_domain->dt[i];
1039                if (rk_dte_is_pt_valid(dte)) {
1040                        phys_addr_t pt_phys = rk_dte_pt_address(dte);
1041                        u32 *page_table = phys_to_virt(pt_phys);
1042                        dma_unmap_single(dma_dev, pt_phys,
1043                                         SPAGE_SIZE, DMA_TO_DEVICE);
1044                        free_page((unsigned long)page_table);
1045                }
1046        }
1047
1048        dma_unmap_single(dma_dev, rk_domain->dt_dma,
1049                         SPAGE_SIZE, DMA_TO_DEVICE);
1050        free_page((unsigned long)rk_domain->dt);
1051
1052        if (domain->type == IOMMU_DOMAIN_DMA)
1053                iommu_put_dma_cookie(&rk_domain->domain);
1054        kfree(rk_domain);
1055}
1056
1057static struct iommu_device *rk_iommu_probe_device(struct device *dev)
1058{
1059        struct rk_iommudata *data;
1060        struct rk_iommu *iommu;
1061
1062        data = dev_iommu_priv_get(dev);
1063        if (!data)
1064                return ERR_PTR(-ENODEV);
1065
1066        iommu = rk_iommu_from_dev(dev);
1067
1068        data->link = device_link_add(dev, iommu->dev,
1069                                     DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME);
1070
1071        return &iommu->iommu;
1072}
1073
1074static void rk_iommu_release_device(struct device *dev)
1075{
1076        struct rk_iommudata *data = dev_iommu_priv_get(dev);
1077
1078        device_link_del(data->link);
1079}
1080
1081static struct iommu_group *rk_iommu_device_group(struct device *dev)
1082{
1083        struct rk_iommu *iommu;
1084
1085        iommu = rk_iommu_from_dev(dev);
1086
1087        return iommu_group_ref_get(iommu->group);
1088}
1089
1090static int rk_iommu_of_xlate(struct device *dev,
1091                             struct of_phandle_args *args)
1092{
1093        struct platform_device *iommu_dev;
1094        struct rk_iommudata *data;
1095
1096        data = devm_kzalloc(dma_dev, sizeof(*data), GFP_KERNEL);
1097        if (!data)
1098                return -ENOMEM;
1099
1100        iommu_dev = of_find_device_by_node(args->np);
1101
1102        data->iommu = platform_get_drvdata(iommu_dev);
1103        dev_iommu_priv_set(dev, data);
1104
1105        platform_device_put(iommu_dev);
1106
1107        return 0;
1108}
1109
1110static const struct iommu_ops rk_iommu_ops = {
1111        .domain_alloc = rk_iommu_domain_alloc,
1112        .domain_free = rk_iommu_domain_free,
1113        .attach_dev = rk_iommu_attach_device,
1114        .detach_dev = rk_iommu_detach_device,
1115        .map = rk_iommu_map,
1116        .unmap = rk_iommu_unmap,
1117        .probe_device = rk_iommu_probe_device,
1118        .release_device = rk_iommu_release_device,
1119        .iova_to_phys = rk_iommu_iova_to_phys,
1120        .device_group = rk_iommu_device_group,
1121        .pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
1122        .of_xlate = rk_iommu_of_xlate,
1123};
1124
1125static int rk_iommu_probe(struct platform_device *pdev)
1126{
1127        struct device *dev = &pdev->dev;
1128        struct rk_iommu *iommu;
1129        struct resource *res;
1130        int num_res = pdev->num_resources;
1131        int err, i;
1132
1133        iommu = devm_kzalloc(dev, sizeof(*iommu), GFP_KERNEL);
1134        if (!iommu)
1135                return -ENOMEM;
1136
1137        platform_set_drvdata(pdev, iommu);
1138        iommu->dev = dev;
1139        iommu->num_mmu = 0;
1140
1141        iommu->bases = devm_kcalloc(dev, num_res, sizeof(*iommu->bases),
1142                                    GFP_KERNEL);
1143        if (!iommu->bases)
1144                return -ENOMEM;
1145
1146        for (i = 0; i < num_res; i++) {
1147                res = platform_get_resource(pdev, IORESOURCE_MEM, i);
1148                if (!res)
1149                        continue;
1150                iommu->bases[i] = devm_ioremap_resource(&pdev->dev, res);
1151                if (IS_ERR(iommu->bases[i]))
1152                        continue;
1153                iommu->num_mmu++;
1154        }
1155        if (iommu->num_mmu == 0)
1156                return PTR_ERR(iommu->bases[0]);
1157
1158        iommu->num_irq = platform_irq_count(pdev);
1159        if (iommu->num_irq < 0)
1160                return iommu->num_irq;
1161
1162        iommu->reset_disabled = device_property_read_bool(dev,
1163                                        "rockchip,disable-mmu-reset");
1164
1165        iommu->num_clocks = ARRAY_SIZE(rk_iommu_clocks);
1166        iommu->clocks = devm_kcalloc(iommu->dev, iommu->num_clocks,
1167                                     sizeof(*iommu->clocks), GFP_KERNEL);
1168        if (!iommu->clocks)
1169                return -ENOMEM;
1170
1171        for (i = 0; i < iommu->num_clocks; ++i)
1172                iommu->clocks[i].id = rk_iommu_clocks[i];
1173
1174        /*
1175         * iommu clocks should be present for all new devices and devicetrees
1176         * but there are older devicetrees without clocks out in the wild.
1177         * So clocks as optional for the time being.
1178         */
1179        err = devm_clk_bulk_get(iommu->dev, iommu->num_clocks, iommu->clocks);
1180        if (err == -ENOENT)
1181                iommu->num_clocks = 0;
1182        else if (err)
1183                return err;
1184
1185        err = clk_bulk_prepare(iommu->num_clocks, iommu->clocks);
1186        if (err)
1187                return err;
1188
1189        iommu->group = iommu_group_alloc();
1190        if (IS_ERR(iommu->group)) {
1191                err = PTR_ERR(iommu->group);
1192                goto err_unprepare_clocks;
1193        }
1194
1195        err = iommu_device_sysfs_add(&iommu->iommu, dev, NULL, dev_name(dev));
1196        if (err)
1197                goto err_put_group;
1198
1199        err = iommu_device_register(&iommu->iommu, &rk_iommu_ops, dev);
1200        if (err)
1201                goto err_remove_sysfs;
1202
1203        /*
1204         * Use the first registered IOMMU device for domain to use with DMA
1205         * API, since a domain might not physically correspond to a single
1206         * IOMMU device..
1207         */
1208        if (!dma_dev)
1209                dma_dev = &pdev->dev;
1210
1211        bus_set_iommu(&platform_bus_type, &rk_iommu_ops);
1212
1213        pm_runtime_enable(dev);
1214
1215        for (i = 0; i < iommu->num_irq; i++) {
1216                int irq = platform_get_irq(pdev, i);
1217
1218                if (irq < 0)
1219                        return irq;
1220
1221                err = devm_request_irq(iommu->dev, irq, rk_iommu_irq,
1222                                       IRQF_SHARED, dev_name(dev), iommu);
1223                if (err) {
1224                        pm_runtime_disable(dev);
1225                        goto err_remove_sysfs;
1226                }
1227        }
1228
1229        return 0;
1230err_remove_sysfs:
1231        iommu_device_sysfs_remove(&iommu->iommu);
1232err_put_group:
1233        iommu_group_put(iommu->group);
1234err_unprepare_clocks:
1235        clk_bulk_unprepare(iommu->num_clocks, iommu->clocks);
1236        return err;
1237}
1238
1239static void rk_iommu_shutdown(struct platform_device *pdev)
1240{
1241        struct rk_iommu *iommu = platform_get_drvdata(pdev);
1242        int i;
1243
1244        for (i = 0; i < iommu->num_irq; i++) {
1245                int irq = platform_get_irq(pdev, i);
1246
1247                devm_free_irq(iommu->dev, irq, iommu);
1248        }
1249
1250        pm_runtime_force_suspend(&pdev->dev);
1251}
1252
1253static int __maybe_unused rk_iommu_suspend(struct device *dev)
1254{
1255        struct rk_iommu *iommu = dev_get_drvdata(dev);
1256
1257        if (!iommu->domain)
1258                return 0;
1259
1260        rk_iommu_disable(iommu);
1261        return 0;
1262}
1263
1264static int __maybe_unused rk_iommu_resume(struct device *dev)
1265{
1266        struct rk_iommu *iommu = dev_get_drvdata(dev);
1267
1268        if (!iommu->domain)
1269                return 0;
1270
1271        return rk_iommu_enable(iommu);
1272}
1273
1274static const struct dev_pm_ops rk_iommu_pm_ops = {
1275        SET_RUNTIME_PM_OPS(rk_iommu_suspend, rk_iommu_resume, NULL)
1276        SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1277                                pm_runtime_force_resume)
1278};
1279
1280static const struct of_device_id rk_iommu_dt_ids[] = {
1281        { .compatible = "rockchip,iommu" },
1282        { /* sentinel */ }
1283};
1284
1285static struct platform_driver rk_iommu_driver = {
1286        .probe = rk_iommu_probe,
1287        .shutdown = rk_iommu_shutdown,
1288        .driver = {
1289                   .name = "rk_iommu",
1290                   .of_match_table = rk_iommu_dt_ids,
1291                   .pm = &rk_iommu_pm_ops,
1292                   .suppress_bind_attrs = true,
1293        },
1294};
1295
1296static int __init rk_iommu_init(void)
1297{
1298        return platform_driver_register(&rk_iommu_driver);
1299}
1300subsys_initcall(rk_iommu_init);
1301