1 /* 2 * Copyright (c) 2015-2016 MediaTek Inc. 3 * Author: Honghui Zhang <honghui.zhang@mediatek.com> 4 * 5 * Based on driver/iommu/mtk_iommu.c 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 #include <linux/bootmem.h> 17 #include <linux/bug.h> 18 #include <linux/clk.h> 19 #include <linux/component.h> 20 #include <linux/device.h> 21 #include <linux/dma-mapping.h> 22 #include <linux/dma-iommu.h> 23 #include <linux/err.h> 24 #include <linux/interrupt.h> 25 #include <linux/io.h> 26 #include <linux/iommu.h> 27 #include <linux/iopoll.h> 28 #include <linux/kmemleak.h> 29 #include <linux/list.h> 30 #include <linux/of_address.h> 31 #include <linux/of_iommu.h> 32 #include <linux/of_irq.h> 33 #include <linux/of_platform.h> 34 #include <linux/platform_device.h> 35 #include <linux/slab.h> 36 #include <linux/spinlock.h> 37 #include <asm/barrier.h> 38 #include <asm/dma-iommu.h> 39 #include <linux/module.h> 40 #include <dt-bindings/memory/mt2701-larb-port.h> 41 #include <soc/mediatek/smi.h> 42 #include "mtk_iommu.h" 43 44 #define REG_MMU_PT_BASE_ADDR 0x000 45 46 #define F_ALL_INVLD 0x2 47 #define F_MMU_INV_RANGE 0x1 48 #define F_INVLD_EN0 BIT(0) 49 #define F_INVLD_EN1 BIT(1) 50 51 #define F_MMU_FAULT_VA_MSK 0xfffff000 52 #define MTK_PROTECT_PA_ALIGN 128 53 54 #define REG_MMU_CTRL_REG 0x210 55 #define F_MMU_CTRL_COHERENT_EN BIT(8) 56 #define REG_MMU_IVRP_PADDR 0x214 57 #define REG_MMU_INT_CONTROL 0x220 58 #define F_INT_TRANSLATION_FAULT BIT(0) 59 #define F_INT_MAIN_MULTI_HIT_FAULT BIT(1) 60 #define F_INT_INVALID_PA_FAULT BIT(2) 61 #define F_INT_ENTRY_REPLACEMENT_FAULT BIT(3) 62 #define F_INT_TABLE_WALK_FAULT BIT(4) 63 #define F_INT_TLB_MISS_FAULT BIT(5) 64 #define F_INT_PFH_DMA_FIFO_OVERFLOW BIT(6) 65 #define F_INT_MISS_DMA_FIFO_OVERFLOW BIT(7) 66 67 #define F_MMU_TF_PROTECT_SEL(prot) (((prot) & 0x3) << 5) 68 #define F_INT_CLR_BIT BIT(12) 69 70 #define REG_MMU_FAULT_ST 0x224 71 #define REG_MMU_FAULT_VA 0x228 72 #define REG_MMU_INVLD_PA 0x22C 73 #define REG_MMU_INT_ID 0x388 74 #define REG_MMU_INVALIDATE 0x5c0 75 #define REG_MMU_INVLD_START_A 0x5c4 76 #define REG_MMU_INVLD_END_A 0x5c8 77 78 #define REG_MMU_INV_SEL 0x5d8 79 #define REG_MMU_STANDARD_AXI_MODE 0x5e8 80 81 #define REG_MMU_DCM 0x5f0 82 #define F_MMU_DCM_ON BIT(1) 83 #define REG_MMU_CPE_DONE 0x60c 84 #define F_DESC_VALID 0x2 85 #define F_DESC_NONSEC BIT(3) 86 #define MT2701_M4U_TF_LARB(TF) (6 - (((TF) >> 13) & 0x7)) 87 #define MT2701_M4U_TF_PORT(TF) (((TF) >> 8) & 0xF) 88 /* MTK generation one iommu HW only support 4K size mapping */ 89 #define MT2701_IOMMU_PAGE_SHIFT 12 90 #define MT2701_IOMMU_PAGE_SIZE (1UL << MT2701_IOMMU_PAGE_SHIFT) 91 92 /* 93 * MTK m4u support 4GB iova address space, and only support 4K page 94 * mapping. So the pagetable size should be exactly as 4M. 95 */ 96 #define M2701_IOMMU_PGT_SIZE SZ_4M 97 98 struct mtk_iommu_domain { 99 spinlock_t pgtlock; /* lock for page table */ 100 struct iommu_domain domain; 101 u32 *pgt_va; 102 dma_addr_t pgt_pa; 103 struct mtk_iommu_data *data; 104 }; 105 106 static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom) 107 { 108 return container_of(dom, struct mtk_iommu_domain, domain); 109 } 110 111 static const int mt2701_m4u_in_larb[] = { 112 LARB0_PORT_OFFSET, LARB1_PORT_OFFSET, 113 LARB2_PORT_OFFSET, LARB3_PORT_OFFSET 114 }; 115 116 static inline int mt2701_m4u_to_larb(int id) 117 { 118 int i; 119 120 for (i = ARRAY_SIZE(mt2701_m4u_in_larb) - 1; i >= 0; i--) 121 if ((id) >= mt2701_m4u_in_larb[i]) 122 return i; 123 124 return 0; 125 } 126 127 static inline int mt2701_m4u_to_port(int id) 128 { 129 int larb = mt2701_m4u_to_larb(id); 130 131 return id - mt2701_m4u_in_larb[larb]; 132 } 133 134 static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data) 135 { 136 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, 137 data->base + REG_MMU_INV_SEL); 138 writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE); 139 wmb(); /* Make sure the tlb flush all done */ 140 } 141 142 static void mtk_iommu_tlb_flush_range(struct mtk_iommu_data *data, 143 unsigned long iova, size_t size) 144 { 145 int ret; 146 u32 tmp; 147 148 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, 149 data->base + REG_MMU_INV_SEL); 150 writel_relaxed(iova & F_MMU_FAULT_VA_MSK, 151 data->base + REG_MMU_INVLD_START_A); 152 writel_relaxed((iova + size - 1) & F_MMU_FAULT_VA_MSK, 153 data->base + REG_MMU_INVLD_END_A); 154 writel_relaxed(F_MMU_INV_RANGE, data->base + REG_MMU_INVALIDATE); 155 156 ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE, 157 tmp, tmp != 0, 10, 100000); 158 if (ret) { 159 dev_warn(data->dev, 160 "Partial TLB flush timed out, falling back to full flush\n"); 161 mtk_iommu_tlb_flush_all(data); 162 } 163 /* Clear the CPE status */ 164 writel_relaxed(0, data->base + REG_MMU_CPE_DONE); 165 } 166 167 static irqreturn_t mtk_iommu_isr(int irq, void *dev_id) 168 { 169 struct mtk_iommu_data *data = dev_id; 170 struct mtk_iommu_domain *dom = data->m4u_dom; 171 u32 int_state, regval, fault_iova, fault_pa; 172 unsigned int fault_larb, fault_port; 173 174 /* Read error information from registers */ 175 int_state = readl_relaxed(data->base + REG_MMU_FAULT_ST); 176 fault_iova = readl_relaxed(data->base + REG_MMU_FAULT_VA); 177 178 fault_iova &= F_MMU_FAULT_VA_MSK; 179 fault_pa = readl_relaxed(data->base + REG_MMU_INVLD_PA); 180 regval = readl_relaxed(data->base + REG_MMU_INT_ID); 181 fault_larb = MT2701_M4U_TF_LARB(regval); 182 fault_port = MT2701_M4U_TF_PORT(regval); 183 184 /* 185 * MTK v1 iommu HW could not determine whether the fault is read or 186 * write fault, report as read fault. 187 */ 188 if (report_iommu_fault(&dom->domain, data->dev, fault_iova, 189 IOMMU_FAULT_READ)) 190 dev_err_ratelimited(data->dev, 191 "fault type=0x%x iova=0x%x pa=0x%x larb=%d port=%d\n", 192 int_state, fault_iova, fault_pa, 193 fault_larb, fault_port); 194 195 /* Interrupt clear */ 196 regval = readl_relaxed(data->base + REG_MMU_INT_CONTROL); 197 regval |= F_INT_CLR_BIT; 198 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL); 199 200 mtk_iommu_tlb_flush_all(data); 201 202 return IRQ_HANDLED; 203 } 204 205 static void mtk_iommu_config(struct mtk_iommu_data *data, 206 struct device *dev, bool enable) 207 { 208 struct mtk_smi_larb_iommu *larb_mmu; 209 unsigned int larbid, portid; 210 struct iommu_fwspec *fwspec = dev->iommu_fwspec; 211 int i; 212 213 for (i = 0; i < fwspec->num_ids; ++i) { 214 larbid = mt2701_m4u_to_larb(fwspec->ids[i]); 215 portid = mt2701_m4u_to_port(fwspec->ids[i]); 216 larb_mmu = &data->smi_imu.larb_imu[larbid]; 217 218 dev_dbg(dev, "%s iommu port: %d\n", 219 enable ? "enable" : "disable", portid); 220 221 if (enable) 222 larb_mmu->mmu |= MTK_SMI_MMU_EN(portid); 223 else 224 larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid); 225 } 226 } 227 228 static int mtk_iommu_domain_finalise(struct mtk_iommu_data *data) 229 { 230 struct mtk_iommu_domain *dom = data->m4u_dom; 231 232 spin_lock_init(&dom->pgtlock); 233 234 dom->pgt_va = dma_zalloc_coherent(data->dev, 235 M2701_IOMMU_PGT_SIZE, 236 &dom->pgt_pa, GFP_KERNEL); 237 if (!dom->pgt_va) 238 return -ENOMEM; 239 240 writel(dom->pgt_pa, data->base + REG_MMU_PT_BASE_ADDR); 241 242 dom->data = data; 243 244 return 0; 245 } 246 247 static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type) 248 { 249 struct mtk_iommu_domain *dom; 250 251 if (type != IOMMU_DOMAIN_UNMANAGED) 252 return NULL; 253 254 dom = kzalloc(sizeof(*dom), GFP_KERNEL); 255 if (!dom) 256 return NULL; 257 258 return &dom->domain; 259 } 260 261 static void mtk_iommu_domain_free(struct iommu_domain *domain) 262 { 263 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 264 struct mtk_iommu_data *data = dom->data; 265 266 dma_free_coherent(data->dev, M2701_IOMMU_PGT_SIZE, 267 dom->pgt_va, dom->pgt_pa); 268 kfree(to_mtk_domain(domain)); 269 } 270 271 static int mtk_iommu_attach_device(struct iommu_domain *domain, 272 struct device *dev) 273 { 274 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 275 struct mtk_iommu_data *data = dev->iommu_fwspec->iommu_priv; 276 int ret; 277 278 if (!data) 279 return -ENODEV; 280 281 if (!data->m4u_dom) { 282 data->m4u_dom = dom; 283 ret = mtk_iommu_domain_finalise(data); 284 if (ret) { 285 data->m4u_dom = NULL; 286 return ret; 287 } 288 } 289 290 mtk_iommu_config(data, dev, true); 291 return 0; 292 } 293 294 static void mtk_iommu_detach_device(struct iommu_domain *domain, 295 struct device *dev) 296 { 297 struct mtk_iommu_data *data = dev->iommu_fwspec->iommu_priv; 298 299 if (!data) 300 return; 301 302 mtk_iommu_config(data, dev, false); 303 } 304 305 static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova, 306 phys_addr_t paddr, size_t size, int prot) 307 { 308 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 309 unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT; 310 unsigned long flags; 311 unsigned int i; 312 u32 *pgt_base_iova = dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT); 313 u32 pabase = (u32)paddr; 314 int map_size = 0; 315 316 spin_lock_irqsave(&dom->pgtlock, flags); 317 for (i = 0; i < page_num; i++) { 318 if (pgt_base_iova[i]) { 319 memset(pgt_base_iova, 0, i * sizeof(u32)); 320 break; 321 } 322 pgt_base_iova[i] = pabase | F_DESC_VALID | F_DESC_NONSEC; 323 pabase += MT2701_IOMMU_PAGE_SIZE; 324 map_size += MT2701_IOMMU_PAGE_SIZE; 325 } 326 327 spin_unlock_irqrestore(&dom->pgtlock, flags); 328 329 mtk_iommu_tlb_flush_range(dom->data, iova, size); 330 331 return map_size == size ? 0 : -EEXIST; 332 } 333 334 static size_t mtk_iommu_unmap(struct iommu_domain *domain, 335 unsigned long iova, size_t size) 336 { 337 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 338 unsigned long flags; 339 u32 *pgt_base_iova = dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT); 340 unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT; 341 342 spin_lock_irqsave(&dom->pgtlock, flags); 343 memset(pgt_base_iova, 0, page_num * sizeof(u32)); 344 spin_unlock_irqrestore(&dom->pgtlock, flags); 345 346 mtk_iommu_tlb_flush_range(dom->data, iova, size); 347 348 return size; 349 } 350 351 static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain, 352 dma_addr_t iova) 353 { 354 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 355 unsigned long flags; 356 phys_addr_t pa; 357 358 spin_lock_irqsave(&dom->pgtlock, flags); 359 pa = *(dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT)); 360 pa = pa & (~(MT2701_IOMMU_PAGE_SIZE - 1)); 361 spin_unlock_irqrestore(&dom->pgtlock, flags); 362 363 return pa; 364 } 365 366 static struct iommu_ops mtk_iommu_ops; 367 368 /* 369 * MTK generation one iommu HW only support one iommu domain, and all the client 370 * sharing the same iova address space. 371 */ 372 static int mtk_iommu_create_mapping(struct device *dev, 373 struct of_phandle_args *args) 374 { 375 struct mtk_iommu_data *data; 376 struct platform_device *m4updev; 377 struct dma_iommu_mapping *mtk_mapping; 378 struct device *m4udev; 379 int ret; 380 381 if (args->args_count != 1) { 382 dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n", 383 args->args_count); 384 return -EINVAL; 385 } 386 387 if (!dev->iommu_fwspec) { 388 ret = iommu_fwspec_init(dev, &args->np->fwnode, &mtk_iommu_ops); 389 if (ret) 390 return ret; 391 } else if (dev->iommu_fwspec->ops != &mtk_iommu_ops) { 392 return -EINVAL; 393 } 394 395 if (!dev->iommu_fwspec->iommu_priv) { 396 /* Get the m4u device */ 397 m4updev = of_find_device_by_node(args->np); 398 if (WARN_ON(!m4updev)) 399 return -EINVAL; 400 401 dev->iommu_fwspec->iommu_priv = platform_get_drvdata(m4updev); 402 } 403 404 ret = iommu_fwspec_add_ids(dev, args->args, 1); 405 if (ret) 406 return ret; 407 408 data = dev->iommu_fwspec->iommu_priv; 409 m4udev = data->dev; 410 mtk_mapping = m4udev->archdata.iommu; 411 if (!mtk_mapping) { 412 /* MTK iommu support 4GB iova address space. */ 413 mtk_mapping = arm_iommu_create_mapping(&platform_bus_type, 414 0, 1ULL << 32); 415 if (IS_ERR(mtk_mapping)) 416 return PTR_ERR(mtk_mapping); 417 418 m4udev->archdata.iommu = mtk_mapping; 419 } 420 421 ret = arm_iommu_attach_device(dev, mtk_mapping); 422 if (ret) 423 goto err_release_mapping; 424 425 return 0; 426 427 err_release_mapping: 428 arm_iommu_release_mapping(mtk_mapping); 429 m4udev->archdata.iommu = NULL; 430 return ret; 431 } 432 433 static int mtk_iommu_add_device(struct device *dev) 434 { 435 struct of_phandle_args iommu_spec; 436 struct of_phandle_iterator it; 437 struct mtk_iommu_data *data; 438 struct iommu_group *group; 439 int err; 440 441 of_for_each_phandle(&it, err, dev->of_node, "iommus", 442 "#iommu-cells", 0) { 443 int count = of_phandle_iterator_args(&it, iommu_spec.args, 444 MAX_PHANDLE_ARGS); 445 iommu_spec.np = of_node_get(it.node); 446 iommu_spec.args_count = count; 447 448 mtk_iommu_create_mapping(dev, &iommu_spec); 449 of_node_put(iommu_spec.np); 450 } 451 452 if (!dev->iommu_fwspec || dev->iommu_fwspec->ops != &mtk_iommu_ops) 453 return -ENODEV; /* Not a iommu client device */ 454 455 data = dev->iommu_fwspec->iommu_priv; 456 iommu_device_link(&data->iommu, dev); 457 458 group = iommu_group_get_for_dev(dev); 459 if (IS_ERR(group)) 460 return PTR_ERR(group); 461 462 iommu_group_put(group); 463 return 0; 464 } 465 466 static void mtk_iommu_remove_device(struct device *dev) 467 { 468 struct mtk_iommu_data *data; 469 470 if (!dev->iommu_fwspec || dev->iommu_fwspec->ops != &mtk_iommu_ops) 471 return; 472 473 data = dev->iommu_fwspec->iommu_priv; 474 iommu_device_unlink(&data->iommu, dev); 475 476 iommu_group_remove_device(dev); 477 iommu_fwspec_free(dev); 478 } 479 480 static struct iommu_group *mtk_iommu_device_group(struct device *dev) 481 { 482 struct mtk_iommu_data *data = dev->iommu_fwspec->iommu_priv; 483 484 if (!data) 485 return ERR_PTR(-ENODEV); 486 487 /* All the client devices are in the same m4u iommu-group */ 488 if (!data->m4u_group) { 489 data->m4u_group = iommu_group_alloc(); 490 if (IS_ERR(data->m4u_group)) 491 dev_err(dev, "Failed to allocate M4U IOMMU group\n"); 492 } else { 493 iommu_group_ref_get(data->m4u_group); 494 } 495 return data->m4u_group; 496 } 497 498 static int mtk_iommu_hw_init(const struct mtk_iommu_data *data) 499 { 500 u32 regval; 501 int ret; 502 503 ret = clk_prepare_enable(data->bclk); 504 if (ret) { 505 dev_err(data->dev, "Failed to enable iommu bclk(%d)\n", ret); 506 return ret; 507 } 508 509 regval = F_MMU_CTRL_COHERENT_EN | F_MMU_TF_PROTECT_SEL(2); 510 writel_relaxed(regval, data->base + REG_MMU_CTRL_REG); 511 512 regval = F_INT_TRANSLATION_FAULT | 513 F_INT_MAIN_MULTI_HIT_FAULT | 514 F_INT_INVALID_PA_FAULT | 515 F_INT_ENTRY_REPLACEMENT_FAULT | 516 F_INT_TABLE_WALK_FAULT | 517 F_INT_TLB_MISS_FAULT | 518 F_INT_PFH_DMA_FIFO_OVERFLOW | 519 F_INT_MISS_DMA_FIFO_OVERFLOW; 520 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL); 521 522 /* protect memory,hw will write here while translation fault */ 523 writel_relaxed(data->protect_base, 524 data->base + REG_MMU_IVRP_PADDR); 525 526 writel_relaxed(F_MMU_DCM_ON, data->base + REG_MMU_DCM); 527 528 if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0, 529 dev_name(data->dev), (void *)data)) { 530 writel_relaxed(0, data->base + REG_MMU_PT_BASE_ADDR); 531 clk_disable_unprepare(data->bclk); 532 dev_err(data->dev, "Failed @ IRQ-%d Request\n", data->irq); 533 return -ENODEV; 534 } 535 536 return 0; 537 } 538 539 static struct iommu_ops mtk_iommu_ops = { 540 .domain_alloc = mtk_iommu_domain_alloc, 541 .domain_free = mtk_iommu_domain_free, 542 .attach_dev = mtk_iommu_attach_device, 543 .detach_dev = mtk_iommu_detach_device, 544 .map = mtk_iommu_map, 545 .unmap = mtk_iommu_unmap, 546 .map_sg = default_iommu_map_sg, 547 .iova_to_phys = mtk_iommu_iova_to_phys, 548 .add_device = mtk_iommu_add_device, 549 .remove_device = mtk_iommu_remove_device, 550 .device_group = mtk_iommu_device_group, 551 .pgsize_bitmap = ~0UL << MT2701_IOMMU_PAGE_SHIFT, 552 }; 553 554 static const struct of_device_id mtk_iommu_of_ids[] = { 555 { .compatible = "mediatek,mt2701-m4u", }, 556 {} 557 }; 558 559 static const struct component_master_ops mtk_iommu_com_ops = { 560 .bind = mtk_iommu_bind, 561 .unbind = mtk_iommu_unbind, 562 }; 563 564 static int mtk_iommu_probe(struct platform_device *pdev) 565 { 566 struct mtk_iommu_data *data; 567 struct device *dev = &pdev->dev; 568 struct resource *res; 569 struct component_match *match = NULL; 570 struct of_phandle_args larb_spec; 571 struct of_phandle_iterator it; 572 void *protect; 573 int larb_nr, ret, err; 574 575 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 576 if (!data) 577 return -ENOMEM; 578 579 data->dev = dev; 580 581 /* Protect memory. HW will access here while translation fault.*/ 582 protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2, 583 GFP_KERNEL | GFP_DMA); 584 if (!protect) 585 return -ENOMEM; 586 data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN); 587 588 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 589 data->base = devm_ioremap_resource(dev, res); 590 if (IS_ERR(data->base)) 591 return PTR_ERR(data->base); 592 593 data->irq = platform_get_irq(pdev, 0); 594 if (data->irq < 0) 595 return data->irq; 596 597 data->bclk = devm_clk_get(dev, "bclk"); 598 if (IS_ERR(data->bclk)) 599 return PTR_ERR(data->bclk); 600 601 larb_nr = 0; 602 of_for_each_phandle(&it, err, dev->of_node, 603 "mediatek,larbs", NULL, 0) { 604 struct platform_device *plarbdev; 605 int count = of_phandle_iterator_args(&it, larb_spec.args, 606 MAX_PHANDLE_ARGS); 607 608 if (count) 609 continue; 610 611 larb_spec.np = of_node_get(it.node); 612 if (!of_device_is_available(larb_spec.np)) 613 continue; 614 615 plarbdev = of_find_device_by_node(larb_spec.np); 616 if (!plarbdev) { 617 plarbdev = of_platform_device_create( 618 larb_spec.np, NULL, 619 platform_bus_type.dev_root); 620 if (!plarbdev) { 621 of_node_put(larb_spec.np); 622 return -EPROBE_DEFER; 623 } 624 } 625 626 data->smi_imu.larb_imu[larb_nr].dev = &plarbdev->dev; 627 component_match_add_release(dev, &match, release_of, 628 compare_of, larb_spec.np); 629 larb_nr++; 630 } 631 632 data->smi_imu.larb_nr = larb_nr; 633 634 platform_set_drvdata(pdev, data); 635 636 ret = mtk_iommu_hw_init(data); 637 if (ret) 638 return ret; 639 640 ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL, 641 dev_name(&pdev->dev)); 642 if (ret) 643 return ret; 644 645 iommu_device_set_ops(&data->iommu, &mtk_iommu_ops); 646 647 ret = iommu_device_register(&data->iommu); 648 if (ret) 649 return ret; 650 651 if (!iommu_present(&platform_bus_type)) 652 bus_set_iommu(&platform_bus_type, &mtk_iommu_ops); 653 654 return component_master_add_with_match(dev, &mtk_iommu_com_ops, match); 655 } 656 657 static int mtk_iommu_remove(struct platform_device *pdev) 658 { 659 struct mtk_iommu_data *data = platform_get_drvdata(pdev); 660 661 iommu_device_sysfs_remove(&data->iommu); 662 iommu_device_unregister(&data->iommu); 663 664 if (iommu_present(&platform_bus_type)) 665 bus_set_iommu(&platform_bus_type, NULL); 666 667 clk_disable_unprepare(data->bclk); 668 devm_free_irq(&pdev->dev, data->irq, data); 669 component_master_del(&pdev->dev, &mtk_iommu_com_ops); 670 return 0; 671 } 672 673 static int __maybe_unused mtk_iommu_suspend(struct device *dev) 674 { 675 struct mtk_iommu_data *data = dev_get_drvdata(dev); 676 struct mtk_iommu_suspend_reg *reg = &data->reg; 677 void __iomem *base = data->base; 678 679 reg->standard_axi_mode = readl_relaxed(base + 680 REG_MMU_STANDARD_AXI_MODE); 681 reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM); 682 reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG); 683 reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL); 684 return 0; 685 } 686 687 static int __maybe_unused mtk_iommu_resume(struct device *dev) 688 { 689 struct mtk_iommu_data *data = dev_get_drvdata(dev); 690 struct mtk_iommu_suspend_reg *reg = &data->reg; 691 void __iomem *base = data->base; 692 693 writel_relaxed(data->m4u_dom->pgt_pa, base + REG_MMU_PT_BASE_ADDR); 694 writel_relaxed(reg->standard_axi_mode, 695 base + REG_MMU_STANDARD_AXI_MODE); 696 writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM); 697 writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG); 698 writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL); 699 writel_relaxed(data->protect_base, base + REG_MMU_IVRP_PADDR); 700 return 0; 701 } 702 703 static const struct dev_pm_ops mtk_iommu_pm_ops = { 704 SET_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume) 705 }; 706 707 static struct platform_driver mtk_iommu_driver = { 708 .probe = mtk_iommu_probe, 709 .remove = mtk_iommu_remove, 710 .driver = { 711 .name = "mtk-iommu", 712 .of_match_table = mtk_iommu_of_ids, 713 .pm = &mtk_iommu_pm_ops, 714 } 715 }; 716 717 static int __init m4u_init(void) 718 { 719 return platform_driver_register(&mtk_iommu_driver); 720 } 721 722 static void __exit m4u_exit(void) 723 { 724 return platform_driver_unregister(&mtk_iommu_driver); 725 } 726 727 subsys_initcall(m4u_init); 728 module_exit(m4u_exit); 729 730 MODULE_DESCRIPTION("IOMMU API for MTK architected m4u v1 implementations"); 731 MODULE_AUTHOR("Honghui Zhang <honghui.zhang@mediatek.com>"); 732 MODULE_LICENSE("GPL v2"); 733