1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2015-2016 MediaTek Inc. 4 * Author: Yong Wu <yong.wu@mediatek.com> 5 */ 6 #include <linux/bug.h> 7 #include <linux/clk.h> 8 #include <linux/component.h> 9 #include <linux/device.h> 10 #include <linux/dma-iommu.h> 11 #include <linux/err.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/iommu.h> 15 #include <linux/iopoll.h> 16 #include <linux/list.h> 17 #include <linux/mfd/syscon.h> 18 #include <linux/of_address.h> 19 #include <linux/of_iommu.h> 20 #include <linux/of_irq.h> 21 #include <linux/of_platform.h> 22 #include <linux/platform_device.h> 23 #include <linux/regmap.h> 24 #include <linux/slab.h> 25 #include <linux/spinlock.h> 26 #include <linux/soc/mediatek/infracfg.h> 27 #include <asm/barrier.h> 28 #include <soc/mediatek/smi.h> 29 30 #include "mtk_iommu.h" 31 32 #define REG_MMU_PT_BASE_ADDR 0x000 33 #define MMU_PT_ADDR_MASK GENMASK(31, 7) 34 35 #define REG_MMU_INVALIDATE 0x020 36 #define F_ALL_INVLD 0x2 37 #define F_MMU_INV_RANGE 0x1 38 39 #define REG_MMU_INVLD_START_A 0x024 40 #define REG_MMU_INVLD_END_A 0x028 41 42 #define REG_MMU_INV_SEL_GEN2 0x02c 43 #define REG_MMU_INV_SEL_GEN1 0x038 44 #define F_INVLD_EN0 BIT(0) 45 #define F_INVLD_EN1 BIT(1) 46 47 #define REG_MMU_MISC_CTRL 0x048 48 #define F_MMU_IN_ORDER_WR_EN_MASK (BIT(1) | BIT(17)) 49 #define F_MMU_STANDARD_AXI_MODE_MASK (BIT(3) | BIT(19)) 50 51 #define REG_MMU_DCM_DIS 0x050 52 #define REG_MMU_WR_LEN_CTRL 0x054 53 #define F_MMU_WR_THROT_DIS_MASK (BIT(5) | BIT(21)) 54 55 #define REG_MMU_CTRL_REG 0x110 56 #define F_MMU_TF_PROT_TO_PROGRAM_ADDR (2 << 4) 57 #define F_MMU_PREFETCH_RT_REPLACE_MOD BIT(4) 58 #define F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173 (2 << 5) 59 60 #define REG_MMU_IVRP_PADDR 0x114 61 62 #define REG_MMU_VLD_PA_RNG 0x118 63 #define F_MMU_VLD_PA_RNG(EA, SA) (((EA) << 8) | (SA)) 64 65 #define REG_MMU_INT_CONTROL0 0x120 66 #define F_L2_MULIT_HIT_EN BIT(0) 67 #define F_TABLE_WALK_FAULT_INT_EN BIT(1) 68 #define F_PREETCH_FIFO_OVERFLOW_INT_EN BIT(2) 69 #define F_MISS_FIFO_OVERFLOW_INT_EN BIT(3) 70 #define F_PREFETCH_FIFO_ERR_INT_EN BIT(5) 71 #define F_MISS_FIFO_ERR_INT_EN BIT(6) 72 #define F_INT_CLR_BIT BIT(12) 73 74 #define REG_MMU_INT_MAIN_CONTROL 0x124 75 /* mmu0 | mmu1 */ 76 #define F_INT_TRANSLATION_FAULT (BIT(0) | BIT(7)) 77 #define F_INT_MAIN_MULTI_HIT_FAULT (BIT(1) | BIT(8)) 78 #define F_INT_INVALID_PA_FAULT (BIT(2) | BIT(9)) 79 #define F_INT_ENTRY_REPLACEMENT_FAULT (BIT(3) | BIT(10)) 80 #define F_INT_TLB_MISS_FAULT (BIT(4) | BIT(11)) 81 #define F_INT_MISS_TRANSACTION_FIFO_FAULT (BIT(5) | BIT(12)) 82 #define F_INT_PRETETCH_TRANSATION_FIFO_FAULT (BIT(6) | BIT(13)) 83 84 #define REG_MMU_CPE_DONE 0x12C 85 86 #define REG_MMU_FAULT_ST1 0x134 87 #define F_REG_MMU0_FAULT_MASK GENMASK(6, 0) 88 #define F_REG_MMU1_FAULT_MASK GENMASK(13, 7) 89 90 #define REG_MMU0_FAULT_VA 0x13c 91 #define F_MMU_FAULT_VA_WRITE_BIT BIT(1) 92 #define F_MMU_FAULT_VA_LAYER_BIT BIT(0) 93 94 #define REG_MMU0_INVLD_PA 0x140 95 #define REG_MMU1_FAULT_VA 0x144 96 #define REG_MMU1_INVLD_PA 0x148 97 #define REG_MMU0_INT_ID 0x150 98 #define REG_MMU1_INT_ID 0x154 99 #define F_MMU_INT_ID_COMM_ID(a) (((a) >> 9) & 0x7) 100 #define F_MMU_INT_ID_SUB_COMM_ID(a) (((a) >> 7) & 0x3) 101 #define F_MMU_INT_ID_LARB_ID(a) (((a) >> 7) & 0x7) 102 #define F_MMU_INT_ID_PORT_ID(a) (((a) >> 2) & 0x1f) 103 104 #define MTK_PROTECT_PA_ALIGN 256 105 106 /* 107 * Get the local arbiter ID and the portid within the larb arbiter 108 * from mtk_m4u_id which is defined by MTK_M4U_ID. 109 */ 110 #define MTK_M4U_TO_LARB(id) (((id) >> 5) & 0xf) 111 #define MTK_M4U_TO_PORT(id) ((id) & 0x1f) 112 113 #define HAS_4GB_MODE BIT(0) 114 /* HW will use the EMI clock if there isn't the "bclk". */ 115 #define HAS_BCLK BIT(1) 116 #define HAS_VLD_PA_RNG BIT(2) 117 #define RESET_AXI BIT(3) 118 #define OUT_ORDER_WR_EN BIT(4) 119 #define HAS_SUB_COMM BIT(5) 120 #define WR_THROT_EN BIT(6) 121 #define HAS_LEGACY_IVRP_PADDR BIT(7) 122 123 #define MTK_IOMMU_HAS_FLAG(pdata, _x) \ 124 ((((pdata)->flags) & (_x)) == (_x)) 125 126 struct mtk_iommu_domain { 127 struct io_pgtable_cfg cfg; 128 struct io_pgtable_ops *iop; 129 130 struct iommu_domain domain; 131 }; 132 133 static const struct iommu_ops mtk_iommu_ops; 134 135 /* 136 * In M4U 4GB mode, the physical address is remapped as below: 137 * 138 * CPU Physical address: 139 * ==================== 140 * 141 * 0 1G 2G 3G 4G 5G 142 * |---A---|---B---|---C---|---D---|---E---| 143 * +--I/O--+------------Memory-------------+ 144 * 145 * IOMMU output physical address: 146 * ============================= 147 * 148 * 4G 5G 6G 7G 8G 149 * |---E---|---B---|---C---|---D---| 150 * +------------Memory-------------+ 151 * 152 * The Region 'A'(I/O) can NOT be mapped by M4U; For Region 'B'/'C'/'D', the 153 * bit32 of the CPU physical address always is needed to set, and for Region 154 * 'E', the CPU physical address keep as is. 155 * Additionally, The iommu consumers always use the CPU phyiscal address. 156 */ 157 #define MTK_IOMMU_4GB_MODE_REMAP_BASE 0x140000000UL 158 159 static LIST_HEAD(m4ulist); /* List all the M4U HWs */ 160 161 #define for_each_m4u(data) list_for_each_entry(data, &m4ulist, list) 162 163 /* 164 * There may be 1 or 2 M4U HWs, But we always expect they are in the same domain 165 * for the performance. 166 * 167 * Here always return the mtk_iommu_data of the first probed M4U where the 168 * iommu domain information is recorded. 169 */ 170 static struct mtk_iommu_data *mtk_iommu_get_m4u_data(void) 171 { 172 struct mtk_iommu_data *data; 173 174 for_each_m4u(data) 175 return data; 176 177 return NULL; 178 } 179 180 static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom) 181 { 182 return container_of(dom, struct mtk_iommu_domain, domain); 183 } 184 185 static void mtk_iommu_tlb_flush_all(void *cookie) 186 { 187 struct mtk_iommu_data *data = cookie; 188 189 for_each_m4u(data) { 190 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, 191 data->base + data->plat_data->inv_sel_reg); 192 writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE); 193 wmb(); /* Make sure the tlb flush all done */ 194 } 195 } 196 197 static void mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size, 198 size_t granule, void *cookie) 199 { 200 struct mtk_iommu_data *data = cookie; 201 unsigned long flags; 202 int ret; 203 u32 tmp; 204 205 for_each_m4u(data) { 206 spin_lock_irqsave(&data->tlb_lock, flags); 207 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, 208 data->base + data->plat_data->inv_sel_reg); 209 210 writel_relaxed(iova, data->base + REG_MMU_INVLD_START_A); 211 writel_relaxed(iova + size - 1, 212 data->base + REG_MMU_INVLD_END_A); 213 writel_relaxed(F_MMU_INV_RANGE, 214 data->base + REG_MMU_INVALIDATE); 215 216 /* tlb sync */ 217 ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE, 218 tmp, tmp != 0, 10, 1000); 219 if (ret) { 220 dev_warn(data->dev, 221 "Partial TLB flush timed out, falling back to full flush\n"); 222 mtk_iommu_tlb_flush_all(cookie); 223 } 224 /* Clear the CPE status */ 225 writel_relaxed(0, data->base + REG_MMU_CPE_DONE); 226 spin_unlock_irqrestore(&data->tlb_lock, flags); 227 } 228 } 229 230 static void mtk_iommu_tlb_flush_page_nosync(struct iommu_iotlb_gather *gather, 231 unsigned long iova, size_t granule, 232 void *cookie) 233 { 234 struct mtk_iommu_data *data = cookie; 235 struct iommu_domain *domain = &data->m4u_dom->domain; 236 237 iommu_iotlb_gather_add_page(domain, gather, iova, granule); 238 } 239 240 static const struct iommu_flush_ops mtk_iommu_flush_ops = { 241 .tlb_flush_all = mtk_iommu_tlb_flush_all, 242 .tlb_flush_walk = mtk_iommu_tlb_flush_range_sync, 243 .tlb_flush_leaf = mtk_iommu_tlb_flush_range_sync, 244 .tlb_add_page = mtk_iommu_tlb_flush_page_nosync, 245 }; 246 247 static irqreturn_t mtk_iommu_isr(int irq, void *dev_id) 248 { 249 struct mtk_iommu_data *data = dev_id; 250 struct mtk_iommu_domain *dom = data->m4u_dom; 251 u32 int_state, regval, fault_iova, fault_pa; 252 unsigned int fault_larb, fault_port, sub_comm = 0; 253 bool layer, write; 254 255 /* Read error info from registers */ 256 int_state = readl_relaxed(data->base + REG_MMU_FAULT_ST1); 257 if (int_state & F_REG_MMU0_FAULT_MASK) { 258 regval = readl_relaxed(data->base + REG_MMU0_INT_ID); 259 fault_iova = readl_relaxed(data->base + REG_MMU0_FAULT_VA); 260 fault_pa = readl_relaxed(data->base + REG_MMU0_INVLD_PA); 261 } else { 262 regval = readl_relaxed(data->base + REG_MMU1_INT_ID); 263 fault_iova = readl_relaxed(data->base + REG_MMU1_FAULT_VA); 264 fault_pa = readl_relaxed(data->base + REG_MMU1_INVLD_PA); 265 } 266 layer = fault_iova & F_MMU_FAULT_VA_LAYER_BIT; 267 write = fault_iova & F_MMU_FAULT_VA_WRITE_BIT; 268 fault_port = F_MMU_INT_ID_PORT_ID(regval); 269 if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_SUB_COMM)) { 270 fault_larb = F_MMU_INT_ID_COMM_ID(regval); 271 sub_comm = F_MMU_INT_ID_SUB_COMM_ID(regval); 272 } else { 273 fault_larb = F_MMU_INT_ID_LARB_ID(regval); 274 } 275 fault_larb = data->plat_data->larbid_remap[fault_larb][sub_comm]; 276 277 if (report_iommu_fault(&dom->domain, data->dev, fault_iova, 278 write ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ)) { 279 dev_err_ratelimited( 280 data->dev, 281 "fault type=0x%x iova=0x%x pa=0x%x larb=%d port=%d layer=%d %s\n", 282 int_state, fault_iova, fault_pa, fault_larb, fault_port, 283 layer, write ? "write" : "read"); 284 } 285 286 /* Interrupt clear */ 287 regval = readl_relaxed(data->base + REG_MMU_INT_CONTROL0); 288 regval |= F_INT_CLR_BIT; 289 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL0); 290 291 mtk_iommu_tlb_flush_all(data); 292 293 return IRQ_HANDLED; 294 } 295 296 static void mtk_iommu_config(struct mtk_iommu_data *data, 297 struct device *dev, bool enable) 298 { 299 struct mtk_smi_larb_iommu *larb_mmu; 300 unsigned int larbid, portid; 301 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); 302 int i; 303 304 for (i = 0; i < fwspec->num_ids; ++i) { 305 larbid = MTK_M4U_TO_LARB(fwspec->ids[i]); 306 portid = MTK_M4U_TO_PORT(fwspec->ids[i]); 307 larb_mmu = &data->larb_imu[larbid]; 308 309 dev_dbg(dev, "%s iommu port: %d\n", 310 enable ? "enable" : "disable", portid); 311 312 if (enable) 313 larb_mmu->mmu |= MTK_SMI_MMU_EN(portid); 314 else 315 larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid); 316 } 317 } 318 319 static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom) 320 { 321 struct mtk_iommu_data *data = mtk_iommu_get_m4u_data(); 322 323 dom->cfg = (struct io_pgtable_cfg) { 324 .quirks = IO_PGTABLE_QUIRK_ARM_NS | 325 IO_PGTABLE_QUIRK_NO_PERMS | 326 IO_PGTABLE_QUIRK_TLBI_ON_MAP | 327 IO_PGTABLE_QUIRK_ARM_MTK_EXT, 328 .pgsize_bitmap = mtk_iommu_ops.pgsize_bitmap, 329 .ias = 32, 330 .oas = 34, 331 .tlb = &mtk_iommu_flush_ops, 332 .iommu_dev = data->dev, 333 }; 334 335 dom->iop = alloc_io_pgtable_ops(ARM_V7S, &dom->cfg, data); 336 if (!dom->iop) { 337 dev_err(data->dev, "Failed to alloc io pgtable\n"); 338 return -EINVAL; 339 } 340 341 /* Update our support page sizes bitmap */ 342 dom->domain.pgsize_bitmap = dom->cfg.pgsize_bitmap; 343 return 0; 344 } 345 346 static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type) 347 { 348 struct mtk_iommu_domain *dom; 349 350 if (type != IOMMU_DOMAIN_DMA) 351 return NULL; 352 353 dom = kzalloc(sizeof(*dom), GFP_KERNEL); 354 if (!dom) 355 return NULL; 356 357 if (iommu_get_dma_cookie(&dom->domain)) 358 goto free_dom; 359 360 if (mtk_iommu_domain_finalise(dom)) 361 goto put_dma_cookie; 362 363 dom->domain.geometry.aperture_start = 0; 364 dom->domain.geometry.aperture_end = DMA_BIT_MASK(32); 365 dom->domain.geometry.force_aperture = true; 366 367 return &dom->domain; 368 369 put_dma_cookie: 370 iommu_put_dma_cookie(&dom->domain); 371 free_dom: 372 kfree(dom); 373 return NULL; 374 } 375 376 static void mtk_iommu_domain_free(struct iommu_domain *domain) 377 { 378 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 379 380 free_io_pgtable_ops(dom->iop); 381 iommu_put_dma_cookie(domain); 382 kfree(to_mtk_domain(domain)); 383 } 384 385 static int mtk_iommu_attach_device(struct iommu_domain *domain, 386 struct device *dev) 387 { 388 struct mtk_iommu_data *data = dev_iommu_priv_get(dev); 389 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 390 391 if (!data) 392 return -ENODEV; 393 394 /* Update the pgtable base address register of the M4U HW */ 395 if (!data->m4u_dom) { 396 data->m4u_dom = dom; 397 writel(dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK, 398 data->base + REG_MMU_PT_BASE_ADDR); 399 } 400 401 mtk_iommu_config(data, dev, true); 402 return 0; 403 } 404 405 static void mtk_iommu_detach_device(struct iommu_domain *domain, 406 struct device *dev) 407 { 408 struct mtk_iommu_data *data = dev_iommu_priv_get(dev); 409 410 if (!data) 411 return; 412 413 mtk_iommu_config(data, dev, false); 414 } 415 416 static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova, 417 phys_addr_t paddr, size_t size, int prot, gfp_t gfp) 418 { 419 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 420 struct mtk_iommu_data *data = mtk_iommu_get_m4u_data(); 421 422 /* The "4GB mode" M4U physically can not use the lower remap of Dram. */ 423 if (data->enable_4GB) 424 paddr |= BIT_ULL(32); 425 426 /* Synchronize with the tlb_lock */ 427 return dom->iop->map(dom->iop, iova, paddr, size, prot, gfp); 428 } 429 430 static size_t mtk_iommu_unmap(struct iommu_domain *domain, 431 unsigned long iova, size_t size, 432 struct iommu_iotlb_gather *gather) 433 { 434 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 435 436 return dom->iop->unmap(dom->iop, iova, size, gather); 437 } 438 439 static void mtk_iommu_flush_iotlb_all(struct iommu_domain *domain) 440 { 441 mtk_iommu_tlb_flush_all(mtk_iommu_get_m4u_data()); 442 } 443 444 static void mtk_iommu_iotlb_sync(struct iommu_domain *domain, 445 struct iommu_iotlb_gather *gather) 446 { 447 struct mtk_iommu_data *data = mtk_iommu_get_m4u_data(); 448 size_t length = gather->end - gather->start; 449 450 if (gather->start == ULONG_MAX) 451 return; 452 453 mtk_iommu_tlb_flush_range_sync(gather->start, length, gather->pgsize, 454 data); 455 } 456 457 static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain, 458 dma_addr_t iova) 459 { 460 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 461 struct mtk_iommu_data *data = mtk_iommu_get_m4u_data(); 462 phys_addr_t pa; 463 464 pa = dom->iop->iova_to_phys(dom->iop, iova); 465 if (data->enable_4GB && pa >= MTK_IOMMU_4GB_MODE_REMAP_BASE) 466 pa &= ~BIT_ULL(32); 467 468 return pa; 469 } 470 471 static struct iommu_device *mtk_iommu_probe_device(struct device *dev) 472 { 473 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); 474 struct mtk_iommu_data *data; 475 476 if (!fwspec || fwspec->ops != &mtk_iommu_ops) 477 return ERR_PTR(-ENODEV); /* Not a iommu client device */ 478 479 data = dev_iommu_priv_get(dev); 480 481 return &data->iommu; 482 } 483 484 static void mtk_iommu_release_device(struct device *dev) 485 { 486 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); 487 488 if (!fwspec || fwspec->ops != &mtk_iommu_ops) 489 return; 490 491 iommu_fwspec_free(dev); 492 } 493 494 static struct iommu_group *mtk_iommu_device_group(struct device *dev) 495 { 496 struct mtk_iommu_data *data = mtk_iommu_get_m4u_data(); 497 498 if (!data) 499 return ERR_PTR(-ENODEV); 500 501 /* All the client devices are in the same m4u iommu-group */ 502 if (!data->m4u_group) { 503 data->m4u_group = iommu_group_alloc(); 504 if (IS_ERR(data->m4u_group)) 505 dev_err(dev, "Failed to allocate M4U IOMMU group\n"); 506 } else { 507 iommu_group_ref_get(data->m4u_group); 508 } 509 return data->m4u_group; 510 } 511 512 static int mtk_iommu_of_xlate(struct device *dev, struct of_phandle_args *args) 513 { 514 struct platform_device *m4updev; 515 516 if (args->args_count != 1) { 517 dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n", 518 args->args_count); 519 return -EINVAL; 520 } 521 522 if (!dev_iommu_priv_get(dev)) { 523 /* Get the m4u device */ 524 m4updev = of_find_device_by_node(args->np); 525 if (WARN_ON(!m4updev)) 526 return -EINVAL; 527 528 dev_iommu_priv_set(dev, platform_get_drvdata(m4updev)); 529 } 530 531 return iommu_fwspec_add_ids(dev, args->args, 1); 532 } 533 534 static const struct iommu_ops mtk_iommu_ops = { 535 .domain_alloc = mtk_iommu_domain_alloc, 536 .domain_free = mtk_iommu_domain_free, 537 .attach_dev = mtk_iommu_attach_device, 538 .detach_dev = mtk_iommu_detach_device, 539 .map = mtk_iommu_map, 540 .unmap = mtk_iommu_unmap, 541 .flush_iotlb_all = mtk_iommu_flush_iotlb_all, 542 .iotlb_sync = mtk_iommu_iotlb_sync, 543 .iova_to_phys = mtk_iommu_iova_to_phys, 544 .probe_device = mtk_iommu_probe_device, 545 .release_device = mtk_iommu_release_device, 546 .device_group = mtk_iommu_device_group, 547 .of_xlate = mtk_iommu_of_xlate, 548 .pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M, 549 }; 550 551 static int mtk_iommu_hw_init(const struct mtk_iommu_data *data) 552 { 553 u32 regval; 554 int ret; 555 556 ret = clk_prepare_enable(data->bclk); 557 if (ret) { 558 dev_err(data->dev, "Failed to enable iommu bclk(%d)\n", ret); 559 return ret; 560 } 561 562 if (data->plat_data->m4u_plat == M4U_MT8173) { 563 regval = F_MMU_PREFETCH_RT_REPLACE_MOD | 564 F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173; 565 } else { 566 regval = readl_relaxed(data->base + REG_MMU_CTRL_REG); 567 regval |= F_MMU_TF_PROT_TO_PROGRAM_ADDR; 568 } 569 writel_relaxed(regval, data->base + REG_MMU_CTRL_REG); 570 571 regval = F_L2_MULIT_HIT_EN | 572 F_TABLE_WALK_FAULT_INT_EN | 573 F_PREETCH_FIFO_OVERFLOW_INT_EN | 574 F_MISS_FIFO_OVERFLOW_INT_EN | 575 F_PREFETCH_FIFO_ERR_INT_EN | 576 F_MISS_FIFO_ERR_INT_EN; 577 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL0); 578 579 regval = F_INT_TRANSLATION_FAULT | 580 F_INT_MAIN_MULTI_HIT_FAULT | 581 F_INT_INVALID_PA_FAULT | 582 F_INT_ENTRY_REPLACEMENT_FAULT | 583 F_INT_TLB_MISS_FAULT | 584 F_INT_MISS_TRANSACTION_FIFO_FAULT | 585 F_INT_PRETETCH_TRANSATION_FIFO_FAULT; 586 writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL); 587 588 if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_LEGACY_IVRP_PADDR)) 589 regval = (data->protect_base >> 1) | (data->enable_4GB << 31); 590 else 591 regval = lower_32_bits(data->protect_base) | 592 upper_32_bits(data->protect_base); 593 writel_relaxed(regval, data->base + REG_MMU_IVRP_PADDR); 594 595 if (data->enable_4GB && 596 MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_VLD_PA_RNG)) { 597 /* 598 * If 4GB mode is enabled, the validate PA range is from 599 * 0x1_0000_0000 to 0x1_ffff_ffff. here record bit[32:30]. 600 */ 601 regval = F_MMU_VLD_PA_RNG(7, 4); 602 writel_relaxed(regval, data->base + REG_MMU_VLD_PA_RNG); 603 } 604 writel_relaxed(0, data->base + REG_MMU_DCM_DIS); 605 if (MTK_IOMMU_HAS_FLAG(data->plat_data, WR_THROT_EN)) { 606 /* write command throttling mode */ 607 regval = readl_relaxed(data->base + REG_MMU_WR_LEN_CTRL); 608 regval &= ~F_MMU_WR_THROT_DIS_MASK; 609 writel_relaxed(regval, data->base + REG_MMU_WR_LEN_CTRL); 610 } 611 612 if (MTK_IOMMU_HAS_FLAG(data->plat_data, RESET_AXI)) { 613 /* The register is called STANDARD_AXI_MODE in this case */ 614 regval = 0; 615 } else { 616 regval = readl_relaxed(data->base + REG_MMU_MISC_CTRL); 617 regval &= ~F_MMU_STANDARD_AXI_MODE_MASK; 618 if (MTK_IOMMU_HAS_FLAG(data->plat_data, OUT_ORDER_WR_EN)) 619 regval &= ~F_MMU_IN_ORDER_WR_EN_MASK; 620 } 621 writel_relaxed(regval, data->base + REG_MMU_MISC_CTRL); 622 623 if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0, 624 dev_name(data->dev), (void *)data)) { 625 writel_relaxed(0, data->base + REG_MMU_PT_BASE_ADDR); 626 clk_disable_unprepare(data->bclk); 627 dev_err(data->dev, "Failed @ IRQ-%d Request\n", data->irq); 628 return -ENODEV; 629 } 630 631 return 0; 632 } 633 634 static const struct component_master_ops mtk_iommu_com_ops = { 635 .bind = mtk_iommu_bind, 636 .unbind = mtk_iommu_unbind, 637 }; 638 639 static int mtk_iommu_probe(struct platform_device *pdev) 640 { 641 struct mtk_iommu_data *data; 642 struct device *dev = &pdev->dev; 643 struct resource *res; 644 resource_size_t ioaddr; 645 struct component_match *match = NULL; 646 struct regmap *infracfg; 647 void *protect; 648 int i, larb_nr, ret; 649 u32 val; 650 char *p; 651 652 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 653 if (!data) 654 return -ENOMEM; 655 data->dev = dev; 656 data->plat_data = of_device_get_match_data(dev); 657 658 /* Protect memory. HW will access here while translation fault.*/ 659 protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2, GFP_KERNEL); 660 if (!protect) 661 return -ENOMEM; 662 data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN); 663 664 if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE)) { 665 switch (data->plat_data->m4u_plat) { 666 case M4U_MT2712: 667 p = "mediatek,mt2712-infracfg"; 668 break; 669 case M4U_MT8173: 670 p = "mediatek,mt8173-infracfg"; 671 break; 672 default: 673 p = NULL; 674 } 675 676 infracfg = syscon_regmap_lookup_by_compatible(p); 677 678 if (IS_ERR(infracfg)) 679 return PTR_ERR(infracfg); 680 681 ret = regmap_read(infracfg, REG_INFRA_MISC, &val); 682 if (ret) 683 return ret; 684 data->enable_4GB = !!(val & F_DDR_4GB_SUPPORT_EN); 685 } 686 687 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 688 data->base = devm_ioremap_resource(dev, res); 689 if (IS_ERR(data->base)) 690 return PTR_ERR(data->base); 691 ioaddr = res->start; 692 693 data->irq = platform_get_irq(pdev, 0); 694 if (data->irq < 0) 695 return data->irq; 696 697 if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_BCLK)) { 698 data->bclk = devm_clk_get(dev, "bclk"); 699 if (IS_ERR(data->bclk)) 700 return PTR_ERR(data->bclk); 701 } 702 703 larb_nr = of_count_phandle_with_args(dev->of_node, 704 "mediatek,larbs", NULL); 705 if (larb_nr < 0) 706 return larb_nr; 707 708 for (i = 0; i < larb_nr; i++) { 709 struct device_node *larbnode; 710 struct platform_device *plarbdev; 711 u32 id; 712 713 larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i); 714 if (!larbnode) 715 return -EINVAL; 716 717 if (!of_device_is_available(larbnode)) { 718 of_node_put(larbnode); 719 continue; 720 } 721 722 ret = of_property_read_u32(larbnode, "mediatek,larb-id", &id); 723 if (ret)/* The id is consecutive if there is no this property */ 724 id = i; 725 726 plarbdev = of_find_device_by_node(larbnode); 727 if (!plarbdev) { 728 of_node_put(larbnode); 729 return -EPROBE_DEFER; 730 } 731 data->larb_imu[id].dev = &plarbdev->dev; 732 733 component_match_add_release(dev, &match, release_of, 734 compare_of, larbnode); 735 } 736 737 platform_set_drvdata(pdev, data); 738 739 ret = mtk_iommu_hw_init(data); 740 if (ret) 741 return ret; 742 743 ret = iommu_device_sysfs_add(&data->iommu, dev, NULL, 744 "mtk-iommu.%pa", &ioaddr); 745 if (ret) 746 return ret; 747 748 iommu_device_set_ops(&data->iommu, &mtk_iommu_ops); 749 iommu_device_set_fwnode(&data->iommu, &pdev->dev.of_node->fwnode); 750 751 ret = iommu_device_register(&data->iommu); 752 if (ret) 753 return ret; 754 755 spin_lock_init(&data->tlb_lock); 756 list_add_tail(&data->list, &m4ulist); 757 758 if (!iommu_present(&platform_bus_type)) 759 bus_set_iommu(&platform_bus_type, &mtk_iommu_ops); 760 761 return component_master_add_with_match(dev, &mtk_iommu_com_ops, match); 762 } 763 764 static int mtk_iommu_remove(struct platform_device *pdev) 765 { 766 struct mtk_iommu_data *data = platform_get_drvdata(pdev); 767 768 iommu_device_sysfs_remove(&data->iommu); 769 iommu_device_unregister(&data->iommu); 770 771 if (iommu_present(&platform_bus_type)) 772 bus_set_iommu(&platform_bus_type, NULL); 773 774 clk_disable_unprepare(data->bclk); 775 devm_free_irq(&pdev->dev, data->irq, data); 776 component_master_del(&pdev->dev, &mtk_iommu_com_ops); 777 return 0; 778 } 779 780 static int __maybe_unused mtk_iommu_suspend(struct device *dev) 781 { 782 struct mtk_iommu_data *data = dev_get_drvdata(dev); 783 struct mtk_iommu_suspend_reg *reg = &data->reg; 784 void __iomem *base = data->base; 785 786 reg->wr_len_ctrl = readl_relaxed(base + REG_MMU_WR_LEN_CTRL); 787 reg->misc_ctrl = readl_relaxed(base + REG_MMU_MISC_CTRL); 788 reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM_DIS); 789 reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG); 790 reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL0); 791 reg->int_main_control = readl_relaxed(base + REG_MMU_INT_MAIN_CONTROL); 792 reg->ivrp_paddr = readl_relaxed(base + REG_MMU_IVRP_PADDR); 793 reg->vld_pa_rng = readl_relaxed(base + REG_MMU_VLD_PA_RNG); 794 clk_disable_unprepare(data->bclk); 795 return 0; 796 } 797 798 static int __maybe_unused mtk_iommu_resume(struct device *dev) 799 { 800 struct mtk_iommu_data *data = dev_get_drvdata(dev); 801 struct mtk_iommu_suspend_reg *reg = &data->reg; 802 struct mtk_iommu_domain *m4u_dom = data->m4u_dom; 803 void __iomem *base = data->base; 804 int ret; 805 806 ret = clk_prepare_enable(data->bclk); 807 if (ret) { 808 dev_err(data->dev, "Failed to enable clk(%d) in resume\n", ret); 809 return ret; 810 } 811 writel_relaxed(reg->wr_len_ctrl, base + REG_MMU_WR_LEN_CTRL); 812 writel_relaxed(reg->misc_ctrl, base + REG_MMU_MISC_CTRL); 813 writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM_DIS); 814 writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG); 815 writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL0); 816 writel_relaxed(reg->int_main_control, base + REG_MMU_INT_MAIN_CONTROL); 817 writel_relaxed(reg->ivrp_paddr, base + REG_MMU_IVRP_PADDR); 818 writel_relaxed(reg->vld_pa_rng, base + REG_MMU_VLD_PA_RNG); 819 if (m4u_dom) 820 writel(m4u_dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK, 821 base + REG_MMU_PT_BASE_ADDR); 822 return 0; 823 } 824 825 static const struct dev_pm_ops mtk_iommu_pm_ops = { 826 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume) 827 }; 828 829 static const struct mtk_iommu_plat_data mt2712_data = { 830 .m4u_plat = M4U_MT2712, 831 .flags = HAS_4GB_MODE | HAS_BCLK | HAS_VLD_PA_RNG, 832 .inv_sel_reg = REG_MMU_INV_SEL_GEN1, 833 .larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}, {6}, {7}}, 834 }; 835 836 static const struct mtk_iommu_plat_data mt6779_data = { 837 .m4u_plat = M4U_MT6779, 838 .flags = HAS_SUB_COMM | OUT_ORDER_WR_EN | WR_THROT_EN, 839 .inv_sel_reg = REG_MMU_INV_SEL_GEN2, 840 .larbid_remap = {{0}, {1}, {2}, {3}, {5}, {7, 8}, {10}, {9}}, 841 }; 842 843 static const struct mtk_iommu_plat_data mt8167_data = { 844 .m4u_plat = M4U_MT8167, 845 .flags = RESET_AXI | HAS_LEGACY_IVRP_PADDR, 846 .inv_sel_reg = REG_MMU_INV_SEL_GEN1, 847 .larbid_remap = {{0}, {1}, {2}}, /* Linear mapping. */ 848 }; 849 850 static const struct mtk_iommu_plat_data mt8173_data = { 851 .m4u_plat = M4U_MT8173, 852 .flags = HAS_4GB_MODE | HAS_BCLK | RESET_AXI | 853 HAS_LEGACY_IVRP_PADDR, 854 .inv_sel_reg = REG_MMU_INV_SEL_GEN1, 855 .larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}}, /* Linear mapping. */ 856 }; 857 858 static const struct mtk_iommu_plat_data mt8183_data = { 859 .m4u_plat = M4U_MT8183, 860 .flags = RESET_AXI, 861 .inv_sel_reg = REG_MMU_INV_SEL_GEN1, 862 .larbid_remap = {{0}, {4}, {5}, {6}, {7}, {2}, {3}, {1}}, 863 }; 864 865 static const struct of_device_id mtk_iommu_of_ids[] = { 866 { .compatible = "mediatek,mt2712-m4u", .data = &mt2712_data}, 867 { .compatible = "mediatek,mt6779-m4u", .data = &mt6779_data}, 868 { .compatible = "mediatek,mt8167-m4u", .data = &mt8167_data}, 869 { .compatible = "mediatek,mt8173-m4u", .data = &mt8173_data}, 870 { .compatible = "mediatek,mt8183-m4u", .data = &mt8183_data}, 871 {} 872 }; 873 874 static struct platform_driver mtk_iommu_driver = { 875 .probe = mtk_iommu_probe, 876 .remove = mtk_iommu_remove, 877 .driver = { 878 .name = "mtk-iommu", 879 .of_match_table = mtk_iommu_of_ids, 880 .pm = &mtk_iommu_pm_ops, 881 } 882 }; 883 884 static int __init mtk_iommu_init(void) 885 { 886 int ret; 887 888 ret = platform_driver_register(&mtk_iommu_driver); 889 if (ret != 0) 890 pr_err("Failed to register MTK IOMMU driver\n"); 891 892 return ret; 893 } 894 895 subsys_initcall(mtk_iommu_init) 896