1 /* 2 * Copyright (c) 2015-2016 MediaTek Inc. 3 * Author: Yong Wu <yong.wu@mediatek.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 #include <linux/bootmem.h> 15 #include <linux/bug.h> 16 #include <linux/clk.h> 17 #include <linux/component.h> 18 #include <linux/device.h> 19 #include <linux/dma-iommu.h> 20 #include <linux/err.h> 21 #include <linux/interrupt.h> 22 #include <linux/io.h> 23 #include <linux/iommu.h> 24 #include <linux/iopoll.h> 25 #include <linux/list.h> 26 #include <linux/of_address.h> 27 #include <linux/of_iommu.h> 28 #include <linux/of_irq.h> 29 #include <linux/of_platform.h> 30 #include <linux/platform_device.h> 31 #include <linux/slab.h> 32 #include <linux/spinlock.h> 33 #include <asm/barrier.h> 34 #include <dt-bindings/memory/mt8173-larb-port.h> 35 #include <soc/mediatek/smi.h> 36 37 #include "mtk_iommu.h" 38 39 #define REG_MMU_PT_BASE_ADDR 0x000 40 41 #define REG_MMU_INVALIDATE 0x020 42 #define F_ALL_INVLD 0x2 43 #define F_MMU_INV_RANGE 0x1 44 45 #define REG_MMU_INVLD_START_A 0x024 46 #define REG_MMU_INVLD_END_A 0x028 47 48 #define REG_MMU_INV_SEL 0x038 49 #define F_INVLD_EN0 BIT(0) 50 #define F_INVLD_EN1 BIT(1) 51 52 #define REG_MMU_STANDARD_AXI_MODE 0x048 53 #define REG_MMU_DCM_DIS 0x050 54 55 #define REG_MMU_CTRL_REG 0x110 56 #define F_MMU_PREFETCH_RT_REPLACE_MOD BIT(4) 57 #define F_MMU_TF_PROTECT_SEL(prot) (((prot) & 0x3) << 5) 58 59 #define REG_MMU_IVRP_PADDR 0x114 60 #define F_MMU_IVRP_PA_SET(pa, ext) (((pa) >> 1) | ((!!(ext)) << 31)) 61 62 #define REG_MMU_INT_CONTROL0 0x120 63 #define F_L2_MULIT_HIT_EN BIT(0) 64 #define F_TABLE_WALK_FAULT_INT_EN BIT(1) 65 #define F_PREETCH_FIFO_OVERFLOW_INT_EN BIT(2) 66 #define F_MISS_FIFO_OVERFLOW_INT_EN BIT(3) 67 #define F_PREFETCH_FIFO_ERR_INT_EN BIT(5) 68 #define F_MISS_FIFO_ERR_INT_EN BIT(6) 69 #define F_INT_CLR_BIT BIT(12) 70 71 #define REG_MMU_INT_MAIN_CONTROL 0x124 72 #define F_INT_TRANSLATION_FAULT BIT(0) 73 #define F_INT_MAIN_MULTI_HIT_FAULT BIT(1) 74 #define F_INT_INVALID_PA_FAULT BIT(2) 75 #define F_INT_ENTRY_REPLACEMENT_FAULT BIT(3) 76 #define F_INT_TLB_MISS_FAULT BIT(4) 77 #define F_INT_MISS_TRANSACTION_FIFO_FAULT BIT(5) 78 #define F_INT_PRETETCH_TRANSATION_FIFO_FAULT BIT(6) 79 80 #define REG_MMU_CPE_DONE 0x12C 81 82 #define REG_MMU_FAULT_ST1 0x134 83 84 #define REG_MMU_FAULT_VA 0x13c 85 #define F_MMU_FAULT_VA_MSK 0xfffff000 86 #define F_MMU_FAULT_VA_WRITE_BIT BIT(1) 87 #define F_MMU_FAULT_VA_LAYER_BIT BIT(0) 88 89 #define REG_MMU_INVLD_PA 0x140 90 #define REG_MMU_INT_ID 0x150 91 #define F_MMU0_INT_ID_LARB_ID(a) (((a) >> 7) & 0x7) 92 #define F_MMU0_INT_ID_PORT_ID(a) (((a) >> 2) & 0x1f) 93 94 #define MTK_PROTECT_PA_ALIGN 128 95 96 struct mtk_iommu_domain { 97 spinlock_t pgtlock; /* lock for page table */ 98 99 struct io_pgtable_cfg cfg; 100 struct io_pgtable_ops *iop; 101 102 struct iommu_domain domain; 103 }; 104 105 static struct iommu_ops mtk_iommu_ops; 106 107 static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom) 108 { 109 return container_of(dom, struct mtk_iommu_domain, domain); 110 } 111 112 static void mtk_iommu_tlb_flush_all(void *cookie) 113 { 114 struct mtk_iommu_data *data = cookie; 115 116 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, data->base + REG_MMU_INV_SEL); 117 writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE); 118 wmb(); /* Make sure the tlb flush all done */ 119 } 120 121 static void mtk_iommu_tlb_add_flush_nosync(unsigned long iova, size_t size, 122 size_t granule, bool leaf, 123 void *cookie) 124 { 125 struct mtk_iommu_data *data = cookie; 126 127 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, data->base + REG_MMU_INV_SEL); 128 129 writel_relaxed(iova, data->base + REG_MMU_INVLD_START_A); 130 writel_relaxed(iova + size - 1, data->base + REG_MMU_INVLD_END_A); 131 writel_relaxed(F_MMU_INV_RANGE, data->base + REG_MMU_INVALIDATE); 132 } 133 134 static void mtk_iommu_tlb_sync(void *cookie) 135 { 136 struct mtk_iommu_data *data = cookie; 137 int ret; 138 u32 tmp; 139 140 ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE, tmp, 141 tmp != 0, 10, 100000); 142 if (ret) { 143 dev_warn(data->dev, 144 "Partial TLB flush timed out, falling back to full flush\n"); 145 mtk_iommu_tlb_flush_all(cookie); 146 } 147 /* Clear the CPE status */ 148 writel_relaxed(0, data->base + REG_MMU_CPE_DONE); 149 } 150 151 static const struct iommu_gather_ops mtk_iommu_gather_ops = { 152 .tlb_flush_all = mtk_iommu_tlb_flush_all, 153 .tlb_add_flush = mtk_iommu_tlb_add_flush_nosync, 154 .tlb_sync = mtk_iommu_tlb_sync, 155 }; 156 157 static irqreturn_t mtk_iommu_isr(int irq, void *dev_id) 158 { 159 struct mtk_iommu_data *data = dev_id; 160 struct mtk_iommu_domain *dom = data->m4u_dom; 161 u32 int_state, regval, fault_iova, fault_pa; 162 unsigned int fault_larb, fault_port; 163 bool layer, write; 164 165 /* Read error info from registers */ 166 int_state = readl_relaxed(data->base + REG_MMU_FAULT_ST1); 167 fault_iova = readl_relaxed(data->base + REG_MMU_FAULT_VA); 168 layer = fault_iova & F_MMU_FAULT_VA_LAYER_BIT; 169 write = fault_iova & F_MMU_FAULT_VA_WRITE_BIT; 170 fault_iova &= F_MMU_FAULT_VA_MSK; 171 fault_pa = readl_relaxed(data->base + REG_MMU_INVLD_PA); 172 regval = readl_relaxed(data->base + REG_MMU_INT_ID); 173 fault_larb = F_MMU0_INT_ID_LARB_ID(regval); 174 fault_port = F_MMU0_INT_ID_PORT_ID(regval); 175 176 if (report_iommu_fault(&dom->domain, data->dev, fault_iova, 177 write ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ)) { 178 dev_err_ratelimited( 179 data->dev, 180 "fault type=0x%x iova=0x%x pa=0x%x larb=%d port=%d layer=%d %s\n", 181 int_state, fault_iova, fault_pa, fault_larb, fault_port, 182 layer, write ? "write" : "read"); 183 } 184 185 /* Interrupt clear */ 186 regval = readl_relaxed(data->base + REG_MMU_INT_CONTROL0); 187 regval |= F_INT_CLR_BIT; 188 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL0); 189 190 mtk_iommu_tlb_flush_all(data); 191 192 return IRQ_HANDLED; 193 } 194 195 static void mtk_iommu_config(struct mtk_iommu_data *data, 196 struct device *dev, bool enable) 197 { 198 struct mtk_smi_larb_iommu *larb_mmu; 199 unsigned int larbid, portid; 200 struct iommu_fwspec *fwspec = dev->iommu_fwspec; 201 int i; 202 203 for (i = 0; i < fwspec->num_ids; ++i) { 204 larbid = MTK_M4U_TO_LARB(fwspec->ids[i]); 205 portid = MTK_M4U_TO_PORT(fwspec->ids[i]); 206 larb_mmu = &data->smi_imu.larb_imu[larbid]; 207 208 dev_dbg(dev, "%s iommu port: %d\n", 209 enable ? "enable" : "disable", portid); 210 211 if (enable) 212 larb_mmu->mmu |= MTK_SMI_MMU_EN(portid); 213 else 214 larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid); 215 } 216 } 217 218 static int mtk_iommu_domain_finalise(struct mtk_iommu_data *data) 219 { 220 struct mtk_iommu_domain *dom = data->m4u_dom; 221 222 spin_lock_init(&dom->pgtlock); 223 224 dom->cfg = (struct io_pgtable_cfg) { 225 .quirks = IO_PGTABLE_QUIRK_ARM_NS | 226 IO_PGTABLE_QUIRK_NO_PERMS | 227 IO_PGTABLE_QUIRK_TLBI_ON_MAP, 228 .pgsize_bitmap = mtk_iommu_ops.pgsize_bitmap, 229 .ias = 32, 230 .oas = 32, 231 .tlb = &mtk_iommu_gather_ops, 232 .iommu_dev = data->dev, 233 }; 234 235 if (data->enable_4GB) 236 dom->cfg.quirks |= IO_PGTABLE_QUIRK_ARM_MTK_4GB; 237 238 dom->iop = alloc_io_pgtable_ops(ARM_V7S, &dom->cfg, data); 239 if (!dom->iop) { 240 dev_err(data->dev, "Failed to alloc io pgtable\n"); 241 return -EINVAL; 242 } 243 244 /* Update our support page sizes bitmap */ 245 dom->domain.pgsize_bitmap = dom->cfg.pgsize_bitmap; 246 247 writel(data->m4u_dom->cfg.arm_v7s_cfg.ttbr[0], 248 data->base + REG_MMU_PT_BASE_ADDR); 249 return 0; 250 } 251 252 static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type) 253 { 254 struct mtk_iommu_domain *dom; 255 256 if (type != IOMMU_DOMAIN_DMA) 257 return NULL; 258 259 dom = kzalloc(sizeof(*dom), GFP_KERNEL); 260 if (!dom) 261 return NULL; 262 263 if (iommu_get_dma_cookie(&dom->domain)) { 264 kfree(dom); 265 return NULL; 266 } 267 268 dom->domain.geometry.aperture_start = 0; 269 dom->domain.geometry.aperture_end = DMA_BIT_MASK(32); 270 dom->domain.geometry.force_aperture = true; 271 272 return &dom->domain; 273 } 274 275 static void mtk_iommu_domain_free(struct iommu_domain *domain) 276 { 277 iommu_put_dma_cookie(domain); 278 kfree(to_mtk_domain(domain)); 279 } 280 281 static int mtk_iommu_attach_device(struct iommu_domain *domain, 282 struct device *dev) 283 { 284 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 285 struct mtk_iommu_data *data = dev->iommu_fwspec->iommu_priv; 286 int ret; 287 288 if (!data) 289 return -ENODEV; 290 291 if (!data->m4u_dom) { 292 data->m4u_dom = dom; 293 ret = mtk_iommu_domain_finalise(data); 294 if (ret) { 295 data->m4u_dom = NULL; 296 return ret; 297 } 298 } else if (data->m4u_dom != dom) { 299 /* All the client devices should be in the same m4u domain */ 300 dev_err(dev, "try to attach into the error iommu domain\n"); 301 return -EPERM; 302 } 303 304 mtk_iommu_config(data, dev, true); 305 return 0; 306 } 307 308 static void mtk_iommu_detach_device(struct iommu_domain *domain, 309 struct device *dev) 310 { 311 struct mtk_iommu_data *data = dev->iommu_fwspec->iommu_priv; 312 313 if (!data) 314 return; 315 316 mtk_iommu_config(data, dev, false); 317 } 318 319 static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova, 320 phys_addr_t paddr, size_t size, int prot) 321 { 322 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 323 unsigned long flags; 324 int ret; 325 326 spin_lock_irqsave(&dom->pgtlock, flags); 327 ret = dom->iop->map(dom->iop, iova, paddr, size, prot); 328 spin_unlock_irqrestore(&dom->pgtlock, flags); 329 330 return ret; 331 } 332 333 static size_t mtk_iommu_unmap(struct iommu_domain *domain, 334 unsigned long iova, size_t size) 335 { 336 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 337 unsigned long flags; 338 size_t unmapsz; 339 340 spin_lock_irqsave(&dom->pgtlock, flags); 341 unmapsz = dom->iop->unmap(dom->iop, iova, size); 342 spin_unlock_irqrestore(&dom->pgtlock, flags); 343 344 return unmapsz; 345 } 346 347 static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain, 348 dma_addr_t iova) 349 { 350 struct mtk_iommu_domain *dom = to_mtk_domain(domain); 351 unsigned long flags; 352 phys_addr_t pa; 353 354 spin_lock_irqsave(&dom->pgtlock, flags); 355 pa = dom->iop->iova_to_phys(dom->iop, iova); 356 spin_unlock_irqrestore(&dom->pgtlock, flags); 357 358 return pa; 359 } 360 361 static int mtk_iommu_add_device(struct device *dev) 362 { 363 struct mtk_iommu_data *data; 364 struct iommu_group *group; 365 366 if (!dev->iommu_fwspec || dev->iommu_fwspec->ops != &mtk_iommu_ops) 367 return -ENODEV; /* Not a iommu client device */ 368 369 data = dev->iommu_fwspec->iommu_priv; 370 iommu_device_link(&data->iommu, dev); 371 372 group = iommu_group_get_for_dev(dev); 373 if (IS_ERR(group)) 374 return PTR_ERR(group); 375 376 iommu_group_put(group); 377 return 0; 378 } 379 380 static void mtk_iommu_remove_device(struct device *dev) 381 { 382 struct mtk_iommu_data *data; 383 384 if (!dev->iommu_fwspec || dev->iommu_fwspec->ops != &mtk_iommu_ops) 385 return; 386 387 data = dev->iommu_fwspec->iommu_priv; 388 iommu_device_unlink(&data->iommu, dev); 389 390 iommu_group_remove_device(dev); 391 iommu_fwspec_free(dev); 392 } 393 394 static struct iommu_group *mtk_iommu_device_group(struct device *dev) 395 { 396 struct mtk_iommu_data *data = dev->iommu_fwspec->iommu_priv; 397 398 if (!data) 399 return ERR_PTR(-ENODEV); 400 401 /* All the client devices are in the same m4u iommu-group */ 402 if (!data->m4u_group) { 403 data->m4u_group = iommu_group_alloc(); 404 if (IS_ERR(data->m4u_group)) 405 dev_err(dev, "Failed to allocate M4U IOMMU group\n"); 406 } else { 407 iommu_group_ref_get(data->m4u_group); 408 } 409 return data->m4u_group; 410 } 411 412 static int mtk_iommu_of_xlate(struct device *dev, struct of_phandle_args *args) 413 { 414 struct platform_device *m4updev; 415 416 if (args->args_count != 1) { 417 dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n", 418 args->args_count); 419 return -EINVAL; 420 } 421 422 if (!dev->iommu_fwspec->iommu_priv) { 423 /* Get the m4u device */ 424 m4updev = of_find_device_by_node(args->np); 425 if (WARN_ON(!m4updev)) 426 return -EINVAL; 427 428 dev->iommu_fwspec->iommu_priv = platform_get_drvdata(m4updev); 429 } 430 431 return iommu_fwspec_add_ids(dev, args->args, 1); 432 } 433 434 static struct iommu_ops mtk_iommu_ops = { 435 .domain_alloc = mtk_iommu_domain_alloc, 436 .domain_free = mtk_iommu_domain_free, 437 .attach_dev = mtk_iommu_attach_device, 438 .detach_dev = mtk_iommu_detach_device, 439 .map = mtk_iommu_map, 440 .unmap = mtk_iommu_unmap, 441 .map_sg = default_iommu_map_sg, 442 .iova_to_phys = mtk_iommu_iova_to_phys, 443 .add_device = mtk_iommu_add_device, 444 .remove_device = mtk_iommu_remove_device, 445 .device_group = mtk_iommu_device_group, 446 .of_xlate = mtk_iommu_of_xlate, 447 .pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M, 448 }; 449 450 static int mtk_iommu_hw_init(const struct mtk_iommu_data *data) 451 { 452 u32 regval; 453 int ret; 454 455 ret = clk_prepare_enable(data->bclk); 456 if (ret) { 457 dev_err(data->dev, "Failed to enable iommu bclk(%d)\n", ret); 458 return ret; 459 } 460 461 regval = F_MMU_PREFETCH_RT_REPLACE_MOD | 462 F_MMU_TF_PROTECT_SEL(2); 463 writel_relaxed(regval, data->base + REG_MMU_CTRL_REG); 464 465 regval = F_L2_MULIT_HIT_EN | 466 F_TABLE_WALK_FAULT_INT_EN | 467 F_PREETCH_FIFO_OVERFLOW_INT_EN | 468 F_MISS_FIFO_OVERFLOW_INT_EN | 469 F_PREFETCH_FIFO_ERR_INT_EN | 470 F_MISS_FIFO_ERR_INT_EN; 471 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL0); 472 473 regval = F_INT_TRANSLATION_FAULT | 474 F_INT_MAIN_MULTI_HIT_FAULT | 475 F_INT_INVALID_PA_FAULT | 476 F_INT_ENTRY_REPLACEMENT_FAULT | 477 F_INT_TLB_MISS_FAULT | 478 F_INT_MISS_TRANSACTION_FIFO_FAULT | 479 F_INT_PRETETCH_TRANSATION_FIFO_FAULT; 480 writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL); 481 482 writel_relaxed(F_MMU_IVRP_PA_SET(data->protect_base, data->enable_4GB), 483 data->base + REG_MMU_IVRP_PADDR); 484 485 writel_relaxed(0, data->base + REG_MMU_DCM_DIS); 486 writel_relaxed(0, data->base + REG_MMU_STANDARD_AXI_MODE); 487 488 if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0, 489 dev_name(data->dev), (void *)data)) { 490 writel_relaxed(0, data->base + REG_MMU_PT_BASE_ADDR); 491 clk_disable_unprepare(data->bclk); 492 dev_err(data->dev, "Failed @ IRQ-%d Request\n", data->irq); 493 return -ENODEV; 494 } 495 496 return 0; 497 } 498 499 static const struct component_master_ops mtk_iommu_com_ops = { 500 .bind = mtk_iommu_bind, 501 .unbind = mtk_iommu_unbind, 502 }; 503 504 static int mtk_iommu_probe(struct platform_device *pdev) 505 { 506 struct mtk_iommu_data *data; 507 struct device *dev = &pdev->dev; 508 struct resource *res; 509 resource_size_t ioaddr; 510 struct component_match *match = NULL; 511 void *protect; 512 int i, larb_nr, ret; 513 514 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 515 if (!data) 516 return -ENOMEM; 517 data->dev = dev; 518 519 /* Protect memory. HW will access here while translation fault.*/ 520 protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2, GFP_KERNEL); 521 if (!protect) 522 return -ENOMEM; 523 data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN); 524 525 /* Whether the current dram is over 4GB */ 526 data->enable_4GB = !!(max_pfn > (0xffffffffUL >> PAGE_SHIFT)); 527 528 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 529 data->base = devm_ioremap_resource(dev, res); 530 if (IS_ERR(data->base)) 531 return PTR_ERR(data->base); 532 ioaddr = res->start; 533 534 data->irq = platform_get_irq(pdev, 0); 535 if (data->irq < 0) 536 return data->irq; 537 538 data->bclk = devm_clk_get(dev, "bclk"); 539 if (IS_ERR(data->bclk)) 540 return PTR_ERR(data->bclk); 541 542 larb_nr = of_count_phandle_with_args(dev->of_node, 543 "mediatek,larbs", NULL); 544 if (larb_nr < 0) 545 return larb_nr; 546 data->smi_imu.larb_nr = larb_nr; 547 548 for (i = 0; i < larb_nr; i++) { 549 struct device_node *larbnode; 550 struct platform_device *plarbdev; 551 552 larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i); 553 if (!larbnode) 554 return -EINVAL; 555 556 if (!of_device_is_available(larbnode)) 557 continue; 558 559 plarbdev = of_find_device_by_node(larbnode); 560 if (!plarbdev) { 561 plarbdev = of_platform_device_create( 562 larbnode, NULL, 563 platform_bus_type.dev_root); 564 if (!plarbdev) { 565 of_node_put(larbnode); 566 return -EPROBE_DEFER; 567 } 568 } 569 data->smi_imu.larb_imu[i].dev = &plarbdev->dev; 570 571 component_match_add_release(dev, &match, release_of, 572 compare_of, larbnode); 573 } 574 575 platform_set_drvdata(pdev, data); 576 577 ret = mtk_iommu_hw_init(data); 578 if (ret) 579 return ret; 580 581 ret = iommu_device_sysfs_add(&data->iommu, dev, NULL, 582 "mtk-iommu.%pa", &ioaddr); 583 if (ret) 584 return ret; 585 586 iommu_device_set_ops(&data->iommu, &mtk_iommu_ops); 587 iommu_device_set_fwnode(&data->iommu, &pdev->dev.of_node->fwnode); 588 589 ret = iommu_device_register(&data->iommu); 590 if (ret) 591 return ret; 592 593 if (!iommu_present(&platform_bus_type)) 594 bus_set_iommu(&platform_bus_type, &mtk_iommu_ops); 595 596 return component_master_add_with_match(dev, &mtk_iommu_com_ops, match); 597 } 598 599 static int mtk_iommu_remove(struct platform_device *pdev) 600 { 601 struct mtk_iommu_data *data = platform_get_drvdata(pdev); 602 603 iommu_device_sysfs_remove(&data->iommu); 604 iommu_device_unregister(&data->iommu); 605 606 if (iommu_present(&platform_bus_type)) 607 bus_set_iommu(&platform_bus_type, NULL); 608 609 free_io_pgtable_ops(data->m4u_dom->iop); 610 clk_disable_unprepare(data->bclk); 611 devm_free_irq(&pdev->dev, data->irq, data); 612 component_master_del(&pdev->dev, &mtk_iommu_com_ops); 613 return 0; 614 } 615 616 static int __maybe_unused mtk_iommu_suspend(struct device *dev) 617 { 618 struct mtk_iommu_data *data = dev_get_drvdata(dev); 619 struct mtk_iommu_suspend_reg *reg = &data->reg; 620 void __iomem *base = data->base; 621 622 reg->standard_axi_mode = readl_relaxed(base + 623 REG_MMU_STANDARD_AXI_MODE); 624 reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM_DIS); 625 reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG); 626 reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL0); 627 reg->int_main_control = readl_relaxed(base + REG_MMU_INT_MAIN_CONTROL); 628 return 0; 629 } 630 631 static int __maybe_unused mtk_iommu_resume(struct device *dev) 632 { 633 struct mtk_iommu_data *data = dev_get_drvdata(dev); 634 struct mtk_iommu_suspend_reg *reg = &data->reg; 635 void __iomem *base = data->base; 636 637 writel_relaxed(data->m4u_dom->cfg.arm_v7s_cfg.ttbr[0], 638 base + REG_MMU_PT_BASE_ADDR); 639 writel_relaxed(reg->standard_axi_mode, 640 base + REG_MMU_STANDARD_AXI_MODE); 641 writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM_DIS); 642 writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG); 643 writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL0); 644 writel_relaxed(reg->int_main_control, base + REG_MMU_INT_MAIN_CONTROL); 645 writel_relaxed(F_MMU_IVRP_PA_SET(data->protect_base, data->enable_4GB), 646 base + REG_MMU_IVRP_PADDR); 647 return 0; 648 } 649 650 const struct dev_pm_ops mtk_iommu_pm_ops = { 651 SET_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume) 652 }; 653 654 static const struct of_device_id mtk_iommu_of_ids[] = { 655 { .compatible = "mediatek,mt8173-m4u", }, 656 {} 657 }; 658 659 static struct platform_driver mtk_iommu_driver = { 660 .probe = mtk_iommu_probe, 661 .remove = mtk_iommu_remove, 662 .driver = { 663 .name = "mtk-iommu", 664 .of_match_table = mtk_iommu_of_ids, 665 .pm = &mtk_iommu_pm_ops, 666 } 667 }; 668 669 static int mtk_iommu_init_fn(struct device_node *np) 670 { 671 int ret; 672 struct platform_device *pdev; 673 674 pdev = of_platform_device_create(np, NULL, platform_bus_type.dev_root); 675 if (!pdev) 676 return -ENOMEM; 677 678 ret = platform_driver_register(&mtk_iommu_driver); 679 if (ret) { 680 pr_err("%s: Failed to register driver\n", __func__); 681 return ret; 682 } 683 684 return 0; 685 } 686 687 IOMMU_OF_DECLARE(mtkm4u, "mediatek,mt8173-m4u", mtk_iommu_init_fn); 688