1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IOMMU API for MTK architected m4u v1 implementations 4 * 5 * Copyright (c) 2015-2016 MediaTek Inc. 6 * Author: Honghui Zhang <honghui.zhang@mediatek.com> 7 * 8 * Based on driver/iommu/mtk_iommu.c 9 */ 10 #include <linux/bug.h> 11 #include <linux/clk.h> 12 #include <linux/component.h> 13 #include <linux/device.h> 14 #include <linux/dma-mapping.h> 15 #include <linux/err.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/module.h> 22 #include <linux/of_address.h> 23 #include <linux/of_irq.h> 24 #include <linux/of_platform.h> 25 #include <linux/platform_device.h> 26 #include <linux/slab.h> 27 #include <linux/spinlock.h> 28 #include <asm/barrier.h> 29 #include <asm/dma-iommu.h> 30 #include <dt-bindings/memory/mtk-memory-port.h> 31 #include <dt-bindings/memory/mt2701-larb-port.h> 32 #include <soc/mediatek/smi.h> 33 34 #define REG_MMU_PT_BASE_ADDR 0x000 35 36 #define F_ALL_INVLD 0x2 37 #define F_MMU_INV_RANGE 0x1 38 #define F_INVLD_EN0 BIT(0) 39 #define F_INVLD_EN1 BIT(1) 40 41 #define F_MMU_FAULT_VA_MSK 0xfffff000 42 #define MTK_PROTECT_PA_ALIGN 128 43 44 #define REG_MMU_CTRL_REG 0x210 45 #define F_MMU_CTRL_COHERENT_EN BIT(8) 46 #define REG_MMU_IVRP_PADDR 0x214 47 #define REG_MMU_INT_CONTROL 0x220 48 #define F_INT_TRANSLATION_FAULT BIT(0) 49 #define F_INT_MAIN_MULTI_HIT_FAULT BIT(1) 50 #define F_INT_INVALID_PA_FAULT BIT(2) 51 #define F_INT_ENTRY_REPLACEMENT_FAULT BIT(3) 52 #define F_INT_TABLE_WALK_FAULT BIT(4) 53 #define F_INT_TLB_MISS_FAULT BIT(5) 54 #define F_INT_PFH_DMA_FIFO_OVERFLOW BIT(6) 55 #define F_INT_MISS_DMA_FIFO_OVERFLOW BIT(7) 56 57 #define F_MMU_TF_PROTECT_SEL(prot) (((prot) & 0x3) << 5) 58 #define F_INT_CLR_BIT BIT(12) 59 60 #define REG_MMU_FAULT_ST 0x224 61 #define REG_MMU_FAULT_VA 0x228 62 #define REG_MMU_INVLD_PA 0x22C 63 #define REG_MMU_INT_ID 0x388 64 #define REG_MMU_INVALIDATE 0x5c0 65 #define REG_MMU_INVLD_START_A 0x5c4 66 #define REG_MMU_INVLD_END_A 0x5c8 67 68 #define REG_MMU_INV_SEL 0x5d8 69 #define REG_MMU_STANDARD_AXI_MODE 0x5e8 70 71 #define REG_MMU_DCM 0x5f0 72 #define F_MMU_DCM_ON BIT(1) 73 #define REG_MMU_CPE_DONE 0x60c 74 #define F_DESC_VALID 0x2 75 #define F_DESC_NONSEC BIT(3) 76 #define MT2701_M4U_TF_LARB(TF) (6 - (((TF) >> 13) & 0x7)) 77 #define MT2701_M4U_TF_PORT(TF) (((TF) >> 8) & 0xF) 78 /* MTK generation one iommu HW only support 4K size mapping */ 79 #define MT2701_IOMMU_PAGE_SHIFT 12 80 #define MT2701_IOMMU_PAGE_SIZE (1UL << MT2701_IOMMU_PAGE_SHIFT) 81 #define MT2701_LARB_NR_MAX 3 82 83 /* 84 * MTK m4u support 4GB iova address space, and only support 4K page 85 * mapping. So the pagetable size should be exactly as 4M. 86 */ 87 #define M2701_IOMMU_PGT_SIZE SZ_4M 88 89 struct mtk_iommu_v1_suspend_reg { 90 u32 standard_axi_mode; 91 u32 dcm_dis; 92 u32 ctrl_reg; 93 u32 int_control0; 94 }; 95 96 struct mtk_iommu_v1_data { 97 void __iomem *base; 98 int irq; 99 struct device *dev; 100 struct clk *bclk; 101 phys_addr_t protect_base; /* protect memory base */ 102 struct mtk_iommu_v1_domain *m4u_dom; 103 104 struct iommu_device iommu; 105 struct dma_iommu_mapping *mapping; 106 struct mtk_smi_larb_iommu larb_imu[MTK_LARB_NR_MAX]; 107 108 struct mtk_iommu_v1_suspend_reg reg; 109 }; 110 111 struct mtk_iommu_v1_domain { 112 spinlock_t pgtlock; /* lock for page table */ 113 struct iommu_domain domain; 114 u32 *pgt_va; 115 dma_addr_t pgt_pa; 116 struct mtk_iommu_v1_data *data; 117 }; 118 mtk_iommu_v1_bind(struct device * dev)119 static int mtk_iommu_v1_bind(struct device *dev) 120 { 121 struct mtk_iommu_v1_data *data = dev_get_drvdata(dev); 122 123 return component_bind_all(dev, &data->larb_imu); 124 } 125 mtk_iommu_v1_unbind(struct device * dev)126 static void mtk_iommu_v1_unbind(struct device *dev) 127 { 128 struct mtk_iommu_v1_data *data = dev_get_drvdata(dev); 129 130 component_unbind_all(dev, &data->larb_imu); 131 } 132 to_mtk_domain(struct iommu_domain * dom)133 static struct mtk_iommu_v1_domain *to_mtk_domain(struct iommu_domain *dom) 134 { 135 return container_of(dom, struct mtk_iommu_v1_domain, domain); 136 } 137 138 static const int mt2701_m4u_in_larb[] = { 139 LARB0_PORT_OFFSET, LARB1_PORT_OFFSET, 140 LARB2_PORT_OFFSET, LARB3_PORT_OFFSET 141 }; 142 mt2701_m4u_to_larb(int id)143 static inline int mt2701_m4u_to_larb(int id) 144 { 145 int i; 146 147 for (i = ARRAY_SIZE(mt2701_m4u_in_larb) - 1; i >= 0; i--) 148 if ((id) >= mt2701_m4u_in_larb[i]) 149 return i; 150 151 return 0; 152 } 153 mt2701_m4u_to_port(int id)154 static inline int mt2701_m4u_to_port(int id) 155 { 156 int larb = mt2701_m4u_to_larb(id); 157 158 return id - mt2701_m4u_in_larb[larb]; 159 } 160 mtk_iommu_v1_tlb_flush_all(struct mtk_iommu_v1_data * data)161 static void mtk_iommu_v1_tlb_flush_all(struct mtk_iommu_v1_data *data) 162 { 163 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, 164 data->base + REG_MMU_INV_SEL); 165 writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE); 166 wmb(); /* Make sure the tlb flush all done */ 167 } 168 mtk_iommu_v1_tlb_flush_range(struct mtk_iommu_v1_data * data,unsigned long iova,size_t size)169 static void mtk_iommu_v1_tlb_flush_range(struct mtk_iommu_v1_data *data, 170 unsigned long iova, size_t size) 171 { 172 int ret; 173 u32 tmp; 174 175 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, 176 data->base + REG_MMU_INV_SEL); 177 writel_relaxed(iova & F_MMU_FAULT_VA_MSK, 178 data->base + REG_MMU_INVLD_START_A); 179 writel_relaxed((iova + size - 1) & F_MMU_FAULT_VA_MSK, 180 data->base + REG_MMU_INVLD_END_A); 181 writel_relaxed(F_MMU_INV_RANGE, data->base + REG_MMU_INVALIDATE); 182 183 ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE, 184 tmp, tmp != 0, 10, 100000); 185 if (ret) { 186 dev_warn(data->dev, 187 "Partial TLB flush timed out, falling back to full flush\n"); 188 mtk_iommu_v1_tlb_flush_all(data); 189 } 190 /* Clear the CPE status */ 191 writel_relaxed(0, data->base + REG_MMU_CPE_DONE); 192 } 193 mtk_iommu_v1_isr(int irq,void * dev_id)194 static irqreturn_t mtk_iommu_v1_isr(int irq, void *dev_id) 195 { 196 struct mtk_iommu_v1_data *data = dev_id; 197 struct mtk_iommu_v1_domain *dom = data->m4u_dom; 198 u32 int_state, regval, fault_iova, fault_pa; 199 unsigned int fault_larb, fault_port; 200 201 /* Read error information from registers */ 202 int_state = readl_relaxed(data->base + REG_MMU_FAULT_ST); 203 fault_iova = readl_relaxed(data->base + REG_MMU_FAULT_VA); 204 205 fault_iova &= F_MMU_FAULT_VA_MSK; 206 fault_pa = readl_relaxed(data->base + REG_MMU_INVLD_PA); 207 regval = readl_relaxed(data->base + REG_MMU_INT_ID); 208 fault_larb = MT2701_M4U_TF_LARB(regval); 209 fault_port = MT2701_M4U_TF_PORT(regval); 210 211 /* 212 * MTK v1 iommu HW could not determine whether the fault is read or 213 * write fault, report as read fault. 214 */ 215 if (report_iommu_fault(&dom->domain, data->dev, fault_iova, 216 IOMMU_FAULT_READ)) 217 dev_err_ratelimited(data->dev, 218 "fault type=0x%x iova=0x%x pa=0x%x larb=%d port=%d\n", 219 int_state, fault_iova, fault_pa, 220 fault_larb, fault_port); 221 222 /* Interrupt clear */ 223 regval = readl_relaxed(data->base + REG_MMU_INT_CONTROL); 224 regval |= F_INT_CLR_BIT; 225 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL); 226 227 mtk_iommu_v1_tlb_flush_all(data); 228 229 return IRQ_HANDLED; 230 } 231 mtk_iommu_v1_config(struct mtk_iommu_v1_data * data,struct device * dev,bool enable)232 static void mtk_iommu_v1_config(struct mtk_iommu_v1_data *data, 233 struct device *dev, bool enable) 234 { 235 struct mtk_smi_larb_iommu *larb_mmu; 236 unsigned int larbid, portid; 237 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); 238 int i; 239 240 for (i = 0; i < fwspec->num_ids; ++i) { 241 larbid = mt2701_m4u_to_larb(fwspec->ids[i]); 242 portid = mt2701_m4u_to_port(fwspec->ids[i]); 243 larb_mmu = &data->larb_imu[larbid]; 244 245 dev_dbg(dev, "%s iommu port: %d\n", 246 enable ? "enable" : "disable", portid); 247 248 if (enable) 249 larb_mmu->mmu |= MTK_SMI_MMU_EN(portid); 250 else 251 larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid); 252 } 253 } 254 mtk_iommu_v1_domain_finalise(struct mtk_iommu_v1_data * data)255 static int mtk_iommu_v1_domain_finalise(struct mtk_iommu_v1_data *data) 256 { 257 struct mtk_iommu_v1_domain *dom = data->m4u_dom; 258 259 spin_lock_init(&dom->pgtlock); 260 261 dom->pgt_va = dma_alloc_coherent(data->dev, M2701_IOMMU_PGT_SIZE, 262 &dom->pgt_pa, GFP_KERNEL); 263 if (!dom->pgt_va) 264 return -ENOMEM; 265 266 writel(dom->pgt_pa, data->base + REG_MMU_PT_BASE_ADDR); 267 268 dom->data = data; 269 270 return 0; 271 } 272 mtk_iommu_v1_domain_alloc(unsigned type)273 static struct iommu_domain *mtk_iommu_v1_domain_alloc(unsigned type) 274 { 275 struct mtk_iommu_v1_domain *dom; 276 277 if (type != IOMMU_DOMAIN_UNMANAGED) 278 return NULL; 279 280 dom = kzalloc(sizeof(*dom), GFP_KERNEL); 281 if (!dom) 282 return NULL; 283 284 return &dom->domain; 285 } 286 mtk_iommu_v1_domain_free(struct iommu_domain * domain)287 static void mtk_iommu_v1_domain_free(struct iommu_domain *domain) 288 { 289 struct mtk_iommu_v1_domain *dom = to_mtk_domain(domain); 290 struct mtk_iommu_v1_data *data = dom->data; 291 292 dma_free_coherent(data->dev, M2701_IOMMU_PGT_SIZE, 293 dom->pgt_va, dom->pgt_pa); 294 kfree(to_mtk_domain(domain)); 295 } 296 mtk_iommu_v1_attach_device(struct iommu_domain * domain,struct device * dev)297 static int mtk_iommu_v1_attach_device(struct iommu_domain *domain, struct device *dev) 298 { 299 struct mtk_iommu_v1_data *data = dev_iommu_priv_get(dev); 300 struct mtk_iommu_v1_domain *dom = to_mtk_domain(domain); 301 struct dma_iommu_mapping *mtk_mapping; 302 int ret; 303 304 /* Only allow the domain created internally. */ 305 mtk_mapping = data->mapping; 306 if (mtk_mapping->domain != domain) 307 return 0; 308 309 if (!data->m4u_dom) { 310 data->m4u_dom = dom; 311 ret = mtk_iommu_v1_domain_finalise(data); 312 if (ret) { 313 data->m4u_dom = NULL; 314 return ret; 315 } 316 } 317 318 mtk_iommu_v1_config(data, dev, true); 319 return 0; 320 } 321 mtk_iommu_v1_set_platform_dma(struct device * dev)322 static void mtk_iommu_v1_set_platform_dma(struct device *dev) 323 { 324 struct mtk_iommu_v1_data *data = dev_iommu_priv_get(dev); 325 326 mtk_iommu_v1_config(data, dev, false); 327 } 328 mtk_iommu_v1_map(struct iommu_domain * domain,unsigned long iova,phys_addr_t paddr,size_t pgsize,size_t pgcount,int prot,gfp_t gfp,size_t * mapped)329 static int mtk_iommu_v1_map(struct iommu_domain *domain, unsigned long iova, 330 phys_addr_t paddr, size_t pgsize, size_t pgcount, 331 int prot, gfp_t gfp, size_t *mapped) 332 { 333 struct mtk_iommu_v1_domain *dom = to_mtk_domain(domain); 334 unsigned long flags; 335 unsigned int i; 336 u32 *pgt_base_iova = dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT); 337 u32 pabase = (u32)paddr; 338 339 spin_lock_irqsave(&dom->pgtlock, flags); 340 for (i = 0; i < pgcount; i++) { 341 if (pgt_base_iova[i]) 342 break; 343 pgt_base_iova[i] = pabase | F_DESC_VALID | F_DESC_NONSEC; 344 pabase += MT2701_IOMMU_PAGE_SIZE; 345 } 346 347 spin_unlock_irqrestore(&dom->pgtlock, flags); 348 349 *mapped = i * MT2701_IOMMU_PAGE_SIZE; 350 mtk_iommu_v1_tlb_flush_range(dom->data, iova, *mapped); 351 352 return i == pgcount ? 0 : -EEXIST; 353 } 354 mtk_iommu_v1_unmap(struct iommu_domain * domain,unsigned long iova,size_t pgsize,size_t pgcount,struct iommu_iotlb_gather * gather)355 static size_t mtk_iommu_v1_unmap(struct iommu_domain *domain, unsigned long iova, 356 size_t pgsize, size_t pgcount, 357 struct iommu_iotlb_gather *gather) 358 { 359 struct mtk_iommu_v1_domain *dom = to_mtk_domain(domain); 360 unsigned long flags; 361 u32 *pgt_base_iova = dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT); 362 size_t size = pgcount * MT2701_IOMMU_PAGE_SIZE; 363 364 spin_lock_irqsave(&dom->pgtlock, flags); 365 memset(pgt_base_iova, 0, pgcount * sizeof(u32)); 366 spin_unlock_irqrestore(&dom->pgtlock, flags); 367 368 mtk_iommu_v1_tlb_flush_range(dom->data, iova, size); 369 370 return size; 371 } 372 mtk_iommu_v1_iova_to_phys(struct iommu_domain * domain,dma_addr_t iova)373 static phys_addr_t mtk_iommu_v1_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) 374 { 375 struct mtk_iommu_v1_domain *dom = to_mtk_domain(domain); 376 unsigned long flags; 377 phys_addr_t pa; 378 379 spin_lock_irqsave(&dom->pgtlock, flags); 380 pa = *(dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT)); 381 pa = pa & (~(MT2701_IOMMU_PAGE_SIZE - 1)); 382 spin_unlock_irqrestore(&dom->pgtlock, flags); 383 384 return pa; 385 } 386 387 static const struct iommu_ops mtk_iommu_v1_ops; 388 389 /* 390 * MTK generation one iommu HW only support one iommu domain, and all the client 391 * sharing the same iova address space. 392 */ mtk_iommu_v1_create_mapping(struct device * dev,struct of_phandle_args * args)393 static int mtk_iommu_v1_create_mapping(struct device *dev, struct of_phandle_args *args) 394 { 395 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); 396 struct mtk_iommu_v1_data *data; 397 struct platform_device *m4updev; 398 struct dma_iommu_mapping *mtk_mapping; 399 int ret; 400 401 if (args->args_count != 1) { 402 dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n", 403 args->args_count); 404 return -EINVAL; 405 } 406 407 if (!fwspec) { 408 ret = iommu_fwspec_init(dev, &args->np->fwnode, &mtk_iommu_v1_ops); 409 if (ret) 410 return ret; 411 fwspec = dev_iommu_fwspec_get(dev); 412 } else if (dev_iommu_fwspec_get(dev)->ops != &mtk_iommu_v1_ops) { 413 return -EINVAL; 414 } 415 416 if (!dev_iommu_priv_get(dev)) { 417 /* Get the m4u device */ 418 m4updev = of_find_device_by_node(args->np); 419 if (WARN_ON(!m4updev)) 420 return -EINVAL; 421 422 dev_iommu_priv_set(dev, platform_get_drvdata(m4updev)); 423 } 424 425 ret = iommu_fwspec_add_ids(dev, args->args, 1); 426 if (ret) 427 return ret; 428 429 data = dev_iommu_priv_get(dev); 430 mtk_mapping = data->mapping; 431 if (!mtk_mapping) { 432 /* MTK iommu support 4GB iova address space. */ 433 mtk_mapping = arm_iommu_create_mapping(&platform_bus_type, 434 0, 1ULL << 32); 435 if (IS_ERR(mtk_mapping)) 436 return PTR_ERR(mtk_mapping); 437 438 data->mapping = mtk_mapping; 439 } 440 441 return 0; 442 } 443 mtk_iommu_v1_def_domain_type(struct device * dev)444 static int mtk_iommu_v1_def_domain_type(struct device *dev) 445 { 446 return IOMMU_DOMAIN_UNMANAGED; 447 } 448 mtk_iommu_v1_probe_device(struct device * dev)449 static struct iommu_device *mtk_iommu_v1_probe_device(struct device *dev) 450 { 451 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); 452 struct of_phandle_args iommu_spec; 453 struct mtk_iommu_v1_data *data; 454 int err, idx = 0, larbid, larbidx; 455 struct device_link *link; 456 struct device *larbdev; 457 458 /* 459 * In the deferred case, free the existed fwspec. 460 * Always initialize the fwspec internally. 461 */ 462 if (fwspec) { 463 iommu_fwspec_free(dev); 464 fwspec = dev_iommu_fwspec_get(dev); 465 } 466 467 while (!of_parse_phandle_with_args(dev->of_node, "iommus", 468 "#iommu-cells", 469 idx, &iommu_spec)) { 470 471 err = mtk_iommu_v1_create_mapping(dev, &iommu_spec); 472 of_node_put(iommu_spec.np); 473 if (err) 474 return ERR_PTR(err); 475 476 /* dev->iommu_fwspec might have changed */ 477 fwspec = dev_iommu_fwspec_get(dev); 478 idx++; 479 } 480 481 if (!fwspec || fwspec->ops != &mtk_iommu_v1_ops) 482 return ERR_PTR(-ENODEV); /* Not a iommu client device */ 483 484 data = dev_iommu_priv_get(dev); 485 486 /* Link the consumer device with the smi-larb device(supplier) */ 487 larbid = mt2701_m4u_to_larb(fwspec->ids[0]); 488 if (larbid >= MT2701_LARB_NR_MAX) 489 return ERR_PTR(-EINVAL); 490 491 for (idx = 1; idx < fwspec->num_ids; idx++) { 492 larbidx = mt2701_m4u_to_larb(fwspec->ids[idx]); 493 if (larbid != larbidx) { 494 dev_err(dev, "Can only use one larb. Fail@larb%d-%d.\n", 495 larbid, larbidx); 496 return ERR_PTR(-EINVAL); 497 } 498 } 499 500 larbdev = data->larb_imu[larbid].dev; 501 if (!larbdev) 502 return ERR_PTR(-EINVAL); 503 504 link = device_link_add(dev, larbdev, 505 DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS); 506 if (!link) 507 dev_err(dev, "Unable to link %s\n", dev_name(larbdev)); 508 509 return &data->iommu; 510 } 511 mtk_iommu_v1_probe_finalize(struct device * dev)512 static void mtk_iommu_v1_probe_finalize(struct device *dev) 513 { 514 struct dma_iommu_mapping *mtk_mapping; 515 struct mtk_iommu_v1_data *data; 516 int err; 517 518 data = dev_iommu_priv_get(dev); 519 mtk_mapping = data->mapping; 520 521 err = arm_iommu_attach_device(dev, mtk_mapping); 522 if (err) 523 dev_err(dev, "Can't create IOMMU mapping - DMA-OPS will not work\n"); 524 } 525 mtk_iommu_v1_release_device(struct device * dev)526 static void mtk_iommu_v1_release_device(struct device *dev) 527 { 528 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); 529 struct mtk_iommu_v1_data *data; 530 struct device *larbdev; 531 unsigned int larbid; 532 533 data = dev_iommu_priv_get(dev); 534 larbid = mt2701_m4u_to_larb(fwspec->ids[0]); 535 larbdev = data->larb_imu[larbid].dev; 536 device_link_remove(dev, larbdev); 537 } 538 mtk_iommu_v1_hw_init(const struct mtk_iommu_v1_data * data)539 static int mtk_iommu_v1_hw_init(const struct mtk_iommu_v1_data *data) 540 { 541 u32 regval; 542 int ret; 543 544 ret = clk_prepare_enable(data->bclk); 545 if (ret) { 546 dev_err(data->dev, "Failed to enable iommu bclk(%d)\n", ret); 547 return ret; 548 } 549 550 regval = F_MMU_CTRL_COHERENT_EN | F_MMU_TF_PROTECT_SEL(2); 551 writel_relaxed(regval, data->base + REG_MMU_CTRL_REG); 552 553 regval = F_INT_TRANSLATION_FAULT | 554 F_INT_MAIN_MULTI_HIT_FAULT | 555 F_INT_INVALID_PA_FAULT | 556 F_INT_ENTRY_REPLACEMENT_FAULT | 557 F_INT_TABLE_WALK_FAULT | 558 F_INT_TLB_MISS_FAULT | 559 F_INT_PFH_DMA_FIFO_OVERFLOW | 560 F_INT_MISS_DMA_FIFO_OVERFLOW; 561 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL); 562 563 /* protect memory,hw will write here while translation fault */ 564 writel_relaxed(data->protect_base, 565 data->base + REG_MMU_IVRP_PADDR); 566 567 writel_relaxed(F_MMU_DCM_ON, data->base + REG_MMU_DCM); 568 569 if (devm_request_irq(data->dev, data->irq, mtk_iommu_v1_isr, 0, 570 dev_name(data->dev), (void *)data)) { 571 writel_relaxed(0, data->base + REG_MMU_PT_BASE_ADDR); 572 clk_disable_unprepare(data->bclk); 573 dev_err(data->dev, "Failed @ IRQ-%d Request\n", data->irq); 574 return -ENODEV; 575 } 576 577 return 0; 578 } 579 580 static const struct iommu_ops mtk_iommu_v1_ops = { 581 .domain_alloc = mtk_iommu_v1_domain_alloc, 582 .probe_device = mtk_iommu_v1_probe_device, 583 .probe_finalize = mtk_iommu_v1_probe_finalize, 584 .release_device = mtk_iommu_v1_release_device, 585 .def_domain_type = mtk_iommu_v1_def_domain_type, 586 .device_group = generic_device_group, 587 .pgsize_bitmap = MT2701_IOMMU_PAGE_SIZE, 588 .set_platform_dma_ops = mtk_iommu_v1_set_platform_dma, 589 .owner = THIS_MODULE, 590 .default_domain_ops = &(const struct iommu_domain_ops) { 591 .attach_dev = mtk_iommu_v1_attach_device, 592 .map_pages = mtk_iommu_v1_map, 593 .unmap_pages = mtk_iommu_v1_unmap, 594 .iova_to_phys = mtk_iommu_v1_iova_to_phys, 595 .free = mtk_iommu_v1_domain_free, 596 } 597 }; 598 599 static const struct of_device_id mtk_iommu_v1_of_ids[] = { 600 { .compatible = "mediatek,mt2701-m4u", }, 601 {} 602 }; 603 MODULE_DEVICE_TABLE(of, mtk_iommu_v1_of_ids); 604 605 static const struct component_master_ops mtk_iommu_v1_com_ops = { 606 .bind = mtk_iommu_v1_bind, 607 .unbind = mtk_iommu_v1_unbind, 608 }; 609 mtk_iommu_v1_probe(struct platform_device * pdev)610 static int mtk_iommu_v1_probe(struct platform_device *pdev) 611 { 612 struct device *dev = &pdev->dev; 613 struct mtk_iommu_v1_data *data; 614 struct resource *res; 615 struct component_match *match = NULL; 616 void *protect; 617 int larb_nr, ret, i; 618 619 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 620 if (!data) 621 return -ENOMEM; 622 623 data->dev = dev; 624 625 /* Protect memory. HW will access here while translation fault.*/ 626 protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2, 627 GFP_KERNEL | GFP_DMA); 628 if (!protect) 629 return -ENOMEM; 630 data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN); 631 632 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 633 data->base = devm_ioremap_resource(dev, res); 634 if (IS_ERR(data->base)) 635 return PTR_ERR(data->base); 636 637 data->irq = platform_get_irq(pdev, 0); 638 if (data->irq < 0) 639 return data->irq; 640 641 data->bclk = devm_clk_get(dev, "bclk"); 642 if (IS_ERR(data->bclk)) 643 return PTR_ERR(data->bclk); 644 645 larb_nr = of_count_phandle_with_args(dev->of_node, 646 "mediatek,larbs", NULL); 647 if (larb_nr < 0) 648 return larb_nr; 649 650 for (i = 0; i < larb_nr; i++) { 651 struct device_node *larbnode; 652 struct platform_device *plarbdev; 653 654 larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i); 655 if (!larbnode) 656 return -EINVAL; 657 658 if (!of_device_is_available(larbnode)) { 659 of_node_put(larbnode); 660 continue; 661 } 662 663 plarbdev = of_find_device_by_node(larbnode); 664 if (!plarbdev) { 665 of_node_put(larbnode); 666 return -ENODEV; 667 } 668 if (!plarbdev->dev.driver) { 669 of_node_put(larbnode); 670 return -EPROBE_DEFER; 671 } 672 data->larb_imu[i].dev = &plarbdev->dev; 673 674 component_match_add_release(dev, &match, component_release_of, 675 component_compare_of, larbnode); 676 } 677 678 platform_set_drvdata(pdev, data); 679 680 ret = mtk_iommu_v1_hw_init(data); 681 if (ret) 682 return ret; 683 684 ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL, 685 dev_name(&pdev->dev)); 686 if (ret) 687 goto out_clk_unprepare; 688 689 ret = iommu_device_register(&data->iommu, &mtk_iommu_v1_ops, dev); 690 if (ret) 691 goto out_sysfs_remove; 692 693 ret = component_master_add_with_match(dev, &mtk_iommu_v1_com_ops, match); 694 if (ret) 695 goto out_dev_unreg; 696 return ret; 697 698 out_dev_unreg: 699 iommu_device_unregister(&data->iommu); 700 out_sysfs_remove: 701 iommu_device_sysfs_remove(&data->iommu); 702 out_clk_unprepare: 703 clk_disable_unprepare(data->bclk); 704 return ret; 705 } 706 mtk_iommu_v1_remove(struct platform_device * pdev)707 static void mtk_iommu_v1_remove(struct platform_device *pdev) 708 { 709 struct mtk_iommu_v1_data *data = platform_get_drvdata(pdev); 710 711 iommu_device_sysfs_remove(&data->iommu); 712 iommu_device_unregister(&data->iommu); 713 714 clk_disable_unprepare(data->bclk); 715 devm_free_irq(&pdev->dev, data->irq, data); 716 component_master_del(&pdev->dev, &mtk_iommu_v1_com_ops); 717 } 718 mtk_iommu_v1_suspend(struct device * dev)719 static int __maybe_unused mtk_iommu_v1_suspend(struct device *dev) 720 { 721 struct mtk_iommu_v1_data *data = dev_get_drvdata(dev); 722 struct mtk_iommu_v1_suspend_reg *reg = &data->reg; 723 void __iomem *base = data->base; 724 725 reg->standard_axi_mode = readl_relaxed(base + 726 REG_MMU_STANDARD_AXI_MODE); 727 reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM); 728 reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG); 729 reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL); 730 return 0; 731 } 732 mtk_iommu_v1_resume(struct device * dev)733 static int __maybe_unused mtk_iommu_v1_resume(struct device *dev) 734 { 735 struct mtk_iommu_v1_data *data = dev_get_drvdata(dev); 736 struct mtk_iommu_v1_suspend_reg *reg = &data->reg; 737 void __iomem *base = data->base; 738 739 writel_relaxed(data->m4u_dom->pgt_pa, base + REG_MMU_PT_BASE_ADDR); 740 writel_relaxed(reg->standard_axi_mode, 741 base + REG_MMU_STANDARD_AXI_MODE); 742 writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM); 743 writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG); 744 writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL); 745 writel_relaxed(data->protect_base, base + REG_MMU_IVRP_PADDR); 746 return 0; 747 } 748 749 static const struct dev_pm_ops mtk_iommu_v1_pm_ops = { 750 SET_SYSTEM_SLEEP_PM_OPS(mtk_iommu_v1_suspend, mtk_iommu_v1_resume) 751 }; 752 753 static struct platform_driver mtk_iommu_v1_driver = { 754 .probe = mtk_iommu_v1_probe, 755 .remove_new = mtk_iommu_v1_remove, 756 .driver = { 757 .name = "mtk-iommu-v1", 758 .of_match_table = mtk_iommu_v1_of_ids, 759 .pm = &mtk_iommu_v1_pm_ops, 760 } 761 }; 762 module_platform_driver(mtk_iommu_v1_driver); 763 764 MODULE_DESCRIPTION("IOMMU API for MediaTek M4U v1 implementations"); 765 MODULE_LICENSE("GPL v2"); 766