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