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Linux 4.19.133
[linux/fpc-iii.git] / drivers / iommu / mtk_iommu_v1.c
blob676c029494e44cc4a8eaf9af26e47d5e9ba40e02
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/list.h>
29 #include <linux/of_address.h>
30 #include <linux/of_iommu.h>
31 #include <linux/of_irq.h>
32 #include <linux/of_platform.h>
33 #include <linux/platform_device.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <asm/barrier.h>
37 #include <asm/dma-iommu.h>
38 #include <linux/module.h>
39 #include <dt-bindings/memory/mt2701-larb-port.h>
40 #include <soc/mediatek/smi.h>
41 #include "mtk_iommu.h"
42
43 #define REG_MMU_PT_BASE_ADDR 0x000
44
45 #define F_ALL_INVLD 0x2
46 #define F_MMU_INV_RANGE 0x1
47 #define F_INVLD_EN0 BIT(0)
48 #define F_INVLD_EN1 BIT(1)
49
50 #define F_MMU_FAULT_VA_MSK 0xfffff000
51 #define MTK_PROTECT_PA_ALIGN 128
52
53 #define REG_MMU_CTRL_REG 0x210
54 #define F_MMU_CTRL_COHERENT_EN BIT(8)
55 #define REG_MMU_IVRP_PADDR 0x214
56 #define REG_MMU_INT_CONTROL 0x220
57 #define F_INT_TRANSLATION_FAULT BIT(0)
58 #define F_INT_MAIN_MULTI_HIT_FAULT BIT(1)
59 #define F_INT_INVALID_PA_FAULT BIT(2)
60 #define F_INT_ENTRY_REPLACEMENT_FAULT BIT(3)
61 #define F_INT_TABLE_WALK_FAULT BIT(4)
62 #define F_INT_TLB_MISS_FAULT BIT(5)
63 #define F_INT_PFH_DMA_FIFO_OVERFLOW BIT(6)
64 #define F_INT_MISS_DMA_FIFO_OVERFLOW BIT(7)
65
66 #define F_MMU_TF_PROTECT_SEL(prot) (((prot) & 0x3) << 5)
67 #define F_INT_CLR_BIT BIT(12)
68
69 #define REG_MMU_FAULT_ST 0x224
70 #define REG_MMU_FAULT_VA 0x228
71 #define REG_MMU_INVLD_PA 0x22C
72 #define REG_MMU_INT_ID 0x388
73 #define REG_MMU_INVALIDATE 0x5c0
74 #define REG_MMU_INVLD_START_A 0x5c4
75 #define REG_MMU_INVLD_END_A 0x5c8
76
77 #define REG_MMU_INV_SEL 0x5d8
78 #define REG_MMU_STANDARD_AXI_MODE 0x5e8
79
80 #define REG_MMU_DCM 0x5f0
81 #define F_MMU_DCM_ON BIT(1)
82 #define REG_MMU_CPE_DONE 0x60c
83 #define F_DESC_VALID 0x2
84 #define F_DESC_NONSEC BIT(3)
85 #define MT2701_M4U_TF_LARB(TF) (6 - (((TF) >> 13) & 0x7))
86 #define MT2701_M4U_TF_PORT(TF) (((TF) >> 8) & 0xF)
87 /* MTK generation one iommu HW only support 4K size mapping */
88 #define MT2701_IOMMU_PAGE_SHIFT 12
89 #define MT2701_IOMMU_PAGE_SIZE (1UL << MT2701_IOMMU_PAGE_SHIFT)
90
91 /*
92 * MTK m4u support 4GB iova address space, and only support 4K page
93 * mapping. So the pagetable size should be exactly as 4M.
94 */
95 #define M2701_IOMMU_PGT_SIZE SZ_4M
96
97 struct mtk_iommu_domain {
98 spinlock_t pgtlock; /* lock for page table */
99 struct iommu_domain domain;
100 u32 *pgt_va;
101 dma_addr_t pgt_pa;
102 struct mtk_iommu_data *data;
103 };
104
105 static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
106 {
107 return container_of(dom, struct mtk_iommu_domain, domain);
108 }
109
110 static const int mt2701_m4u_in_larb[] = {
111 LARB0_PORT_OFFSET, LARB1_PORT_OFFSET,
112 LARB2_PORT_OFFSET, LARB3_PORT_OFFSET
113 };
114
115 static inline int mt2701_m4u_to_larb(int id)
116 {
117 int i;
118
119 for (i = ARRAY_SIZE(mt2701_m4u_in_larb) - 1; i >= 0; i--)
120 if ((id) >= mt2701_m4u_in_larb[i])
121 return i;
122
123 return 0;
124 }
125
126 static inline int mt2701_m4u_to_port(int id)
127 {
128 int larb = mt2701_m4u_to_larb(id);
129
130 return id - mt2701_m4u_in_larb[larb];
131 }
132
133 static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data)
134 {
135 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
136 data->base + REG_MMU_INV_SEL);
137 writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE);
138 wmb(); /* Make sure the tlb flush all done */
139 }
140
141 static void mtk_iommu_tlb_flush_range(struct mtk_iommu_data *data,
142 unsigned long iova, size_t size)
143 {
144 int ret;
145 u32 tmp;
146
147 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
148 data->base + REG_MMU_INV_SEL);
149 writel_relaxed(iova & F_MMU_FAULT_VA_MSK,
150 data->base + REG_MMU_INVLD_START_A);
151 writel_relaxed((iova + size - 1) & F_MMU_FAULT_VA_MSK,
152 data->base + REG_MMU_INVLD_END_A);
153 writel_relaxed(F_MMU_INV_RANGE, data->base + REG_MMU_INVALIDATE);
154
155 ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE,
156 tmp, tmp != 0, 10, 100000);
157 if (ret) {
158 dev_warn(data->dev,
159 "Partial TLB flush timed out, falling back to full flush\n");
160 mtk_iommu_tlb_flush_all(data);
161 }
162 /* Clear the CPE status */
163 writel_relaxed(0, data->base + REG_MMU_CPE_DONE);
164 }
165
166 static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
167 {
168 struct mtk_iommu_data *data = dev_id;
169 struct mtk_iommu_domain *dom = data->m4u_dom;
170 u32 int_state, regval, fault_iova, fault_pa;
171 unsigned int fault_larb, fault_port;
172
173 /* Read error information from registers */
174 int_state = readl_relaxed(data->base + REG_MMU_FAULT_ST);
175 fault_iova = readl_relaxed(data->base + REG_MMU_FAULT_VA);
176
177 fault_iova &= F_MMU_FAULT_VA_MSK;
178 fault_pa = readl_relaxed(data->base + REG_MMU_INVLD_PA);
179 regval = readl_relaxed(data->base + REG_MMU_INT_ID);
180 fault_larb = MT2701_M4U_TF_LARB(regval);
181 fault_port = MT2701_M4U_TF_PORT(regval);
182
183 /*
184 * MTK v1 iommu HW could not determine whether the fault is read or
185 * write fault, report as read fault.
186 */
187 if (report_iommu_fault(&dom->domain, data->dev, fault_iova,
188 IOMMU_FAULT_READ))
189 dev_err_ratelimited(data->dev,
190 "fault type=0x%x iova=0x%x pa=0x%x larb=%d port=%d\n",
191 int_state, fault_iova, fault_pa,
192 fault_larb, fault_port);
193
194 /* Interrupt clear */
195 regval = readl_relaxed(data->base + REG_MMU_INT_CONTROL);
196 regval |= F_INT_CLR_BIT;
197 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL);
198
199 mtk_iommu_tlb_flush_all(data);
200
201 return IRQ_HANDLED;
202 }
203
204 static void mtk_iommu_config(struct mtk_iommu_data *data,
205 struct device *dev, bool enable)
206 {
207 struct mtk_smi_larb_iommu *larb_mmu;
208 unsigned int larbid, portid;
209 struct iommu_fwspec *fwspec = dev->iommu_fwspec;
210 int i;
211
212 for (i = 0; i < fwspec->num_ids; ++i) {
213 larbid = mt2701_m4u_to_larb(fwspec->ids[i]);
214 portid = mt2701_m4u_to_port(fwspec->ids[i]);
215 larb_mmu = &data->smi_imu.larb_imu[larbid];
216
217 dev_dbg(dev, "%s iommu port: %d\n",
218 enable ? "enable" : "disable", portid);
219
220 if (enable)
221 larb_mmu->mmu |= MTK_SMI_MMU_EN(portid);
222 else
223 larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid);
224 }
225 }
226
227 static int mtk_iommu_domain_finalise(struct mtk_iommu_data *data)
228 {
229 struct mtk_iommu_domain *dom = data->m4u_dom;
230
231 spin_lock_init(&dom->pgtlock);
232
233 dom->pgt_va = dma_zalloc_coherent(data->dev,
234 M2701_IOMMU_PGT_SIZE,
235 &dom->pgt_pa, GFP_KERNEL);
236 if (!dom->pgt_va)
237 return -ENOMEM;
238
239 writel(dom->pgt_pa, data->base + REG_MMU_PT_BASE_ADDR);
240
241 dom->data = data;
242
243 return 0;
244 }
245
246 static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
247 {
248 struct mtk_iommu_domain *dom;
249
250 if (type != IOMMU_DOMAIN_UNMANAGED)
251 return NULL;
252
253 dom = kzalloc(sizeof(*dom), GFP_KERNEL);
254 if (!dom)
255 return NULL;
256
257 return &dom->domain;
258 }
259
260 static void mtk_iommu_domain_free(struct iommu_domain *domain)
261 {
262 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
263 struct mtk_iommu_data *data = dom->data;
264
265 dma_free_coherent(data->dev, M2701_IOMMU_PGT_SIZE,
266 dom->pgt_va, dom->pgt_pa);
267 kfree(to_mtk_domain(domain));
268 }
269
270 static int mtk_iommu_attach_device(struct iommu_domain *domain,
271 struct device *dev)
272 {
273 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
274 struct mtk_iommu_data *data = dev->iommu_fwspec->iommu_priv;
275 int ret;
276
277 if (!data)
278 return -ENODEV;
279
280 if (!data->m4u_dom) {
281 data->m4u_dom = dom;
282 ret = mtk_iommu_domain_finalise(data);
283 if (ret) {
284 data->m4u_dom = NULL;
285 return ret;
286 }
287 }
288
289 mtk_iommu_config(data, dev, true);
290 return 0;
291 }
292
293 static void mtk_iommu_detach_device(struct iommu_domain *domain,
294 struct device *dev)
295 {
296 struct mtk_iommu_data *data = dev->iommu_fwspec->iommu_priv;
297
298 if (!data)
299 return;
300
301 mtk_iommu_config(data, dev, false);
302 }
303
304 static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,
305 phys_addr_t paddr, size_t size, int prot)
306 {
307 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
308 unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT;
309 unsigned long flags;
310 unsigned int i;
311 u32 *pgt_base_iova = dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT);
312 u32 pabase = (u32)paddr;
313 int map_size = 0;
314
315 spin_lock_irqsave(&dom->pgtlock, flags);
316 for (i = 0; i < page_num; i++) {
317 if (pgt_base_iova[i]) {
318 memset(pgt_base_iova, 0, i * sizeof(u32));
319 break;
320 }
321 pgt_base_iova[i] = pabase | F_DESC_VALID | F_DESC_NONSEC;
322 pabase += MT2701_IOMMU_PAGE_SIZE;
323 map_size += MT2701_IOMMU_PAGE_SIZE;
324 }
325
326 spin_unlock_irqrestore(&dom->pgtlock, flags);
327
328 mtk_iommu_tlb_flush_range(dom->data, iova, size);
329
330 return map_size == size ? 0 : -EEXIST;
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 u32 *pgt_base_iova = dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT);
339 unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT;
340
341 spin_lock_irqsave(&dom->pgtlock, flags);
342 memset(pgt_base_iova, 0, page_num * sizeof(u32));
343 spin_unlock_irqrestore(&dom->pgtlock, flags);
344
345 mtk_iommu_tlb_flush_range(dom->data, iova, size);
346
347 return size;
348 }
349
350 static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
351 dma_addr_t iova)
352 {
353 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
354 unsigned long flags;
355 phys_addr_t pa;
356
357 spin_lock_irqsave(&dom->pgtlock, flags);
358 pa = *(dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT));
359 pa = pa & (~(MT2701_IOMMU_PAGE_SIZE - 1));
360 spin_unlock_irqrestore(&dom->pgtlock, flags);
361
362 return pa;
363 }
364
365 static struct iommu_ops mtk_iommu_ops;
366
367 /*
368 * MTK generation one iommu HW only support one iommu domain, and all the client
369 * sharing the same iova address space.
370 */
371 static int mtk_iommu_create_mapping(struct device *dev,
372 struct of_phandle_args *args)
373 {
374 struct mtk_iommu_data *data;
375 struct platform_device *m4updev;
376 struct dma_iommu_mapping *mtk_mapping;
377 struct device *m4udev;
378 int ret;
379
380 if (args->args_count != 1) {
381 dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n",
382 args->args_count);
383 return -EINVAL;
384 }
385
386 if (!dev->iommu_fwspec) {
387 ret = iommu_fwspec_init(dev, &args->np->fwnode, &mtk_iommu_ops);
388 if (ret)
389 return ret;
390 } else if (dev->iommu_fwspec->ops != &mtk_iommu_ops) {
391 return -EINVAL;
392 }
393
394 if (!dev->iommu_fwspec->iommu_priv) {
395 /* Get the m4u device */
396 m4updev = of_find_device_by_node(args->np);
397 if (WARN_ON(!m4updev))
398 return -EINVAL;
399
400 dev->iommu_fwspec->iommu_priv = platform_get_drvdata(m4updev);
401 }
402
403 ret = iommu_fwspec_add_ids(dev, args->args, 1);
404 if (ret)
405 return ret;
406
407 data = dev->iommu_fwspec->iommu_priv;
408 m4udev = data->dev;
409 mtk_mapping = m4udev->archdata.iommu;
410 if (!mtk_mapping) {
411 /* MTK iommu support 4GB iova address space. */
412 mtk_mapping = arm_iommu_create_mapping(&platform_bus_type,
413 0, 1ULL << 32);
414 if (IS_ERR(mtk_mapping))
415 return PTR_ERR(mtk_mapping);
416
417 m4udev->archdata.iommu = mtk_mapping;
418 }
419
420 return 0;
421 }
422
423 static int mtk_iommu_add_device(struct device *dev)
424 {
425 struct dma_iommu_mapping *mtk_mapping;
426 struct of_phandle_args iommu_spec;
427 struct of_phandle_iterator it;
428 struct mtk_iommu_data *data;
429 struct iommu_group *group;
430 int err;
431
432 of_for_each_phandle(&it, err, dev->of_node, "iommus",
433 "#iommu-cells", 0) {
434 int count = of_phandle_iterator_args(&it, iommu_spec.args,
435 MAX_PHANDLE_ARGS);
436 iommu_spec.np = of_node_get(it.node);
437 iommu_spec.args_count = count;
438
439 mtk_iommu_create_mapping(dev, &iommu_spec);
440 of_node_put(iommu_spec.np);
441 }
442
443 if (!dev->iommu_fwspec || dev->iommu_fwspec->ops != &mtk_iommu_ops)
444 return -ENODEV; /* Not a iommu client device */
445
446 /*
447 * This is a short-term bodge because the ARM DMA code doesn't
448 * understand multi-device groups, but we have to call into it
449 * successfully (and not just rely on a normal IOMMU API attach
450 * here) in order to set the correct DMA API ops on @dev.
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 = dev->iommu_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
472 static void mtk_iommu_remove_device(struct device *dev)
473 {
474 struct mtk_iommu_data *data;
475
476 if (!dev->iommu_fwspec || dev->iommu_fwspec->ops != &mtk_iommu_ops)
477 return;
478
479 data = dev->iommu_fwspec->iommu_priv;
480 iommu_device_unlink(&data->iommu, dev);
481
482 iommu_group_remove_device(dev);
483 iommu_fwspec_free(dev);
484 }
485
486 static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
487 {
488 u32 regval;
489 int ret;
490
491 ret = clk_prepare_enable(data->bclk);
492 if (ret) {
493 dev_err(data->dev, "Failed to enable iommu bclk(%d)\n", ret);
494 return ret;
495 }
496
497 regval = F_MMU_CTRL_COHERENT_EN | F_MMU_TF_PROTECT_SEL(2);
498 writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
499
500 regval = F_INT_TRANSLATION_FAULT |
501 F_INT_MAIN_MULTI_HIT_FAULT |
502 F_INT_INVALID_PA_FAULT |
503 F_INT_ENTRY_REPLACEMENT_FAULT |
504 F_INT_TABLE_WALK_FAULT |
505 F_INT_TLB_MISS_FAULT |
506 F_INT_PFH_DMA_FIFO_OVERFLOW |
507 F_INT_MISS_DMA_FIFO_OVERFLOW;
508 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL);
509
510 /* protect memory,hw will write here while translation fault */
511 writel_relaxed(data->protect_base,
512 data->base + REG_MMU_IVRP_PADDR);
513
514 writel_relaxed(F_MMU_DCM_ON, data->base + REG_MMU_DCM);
515
516 if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
517 dev_name(data->dev), (void *)data)) {
518 writel_relaxed(0, data->base + REG_MMU_PT_BASE_ADDR);
519 clk_disable_unprepare(data->bclk);
520 dev_err(data->dev, "Failed @ IRQ-%d Request\n", data->irq);
521 return -ENODEV;
522 }
523
524 return 0;
525 }
526
527 static struct iommu_ops mtk_iommu_ops = {
528 .domain_alloc = mtk_iommu_domain_alloc,
529 .domain_free = mtk_iommu_domain_free,
530 .attach_dev = mtk_iommu_attach_device,
531 .detach_dev = mtk_iommu_detach_device,
532 .map = mtk_iommu_map,
533 .unmap = mtk_iommu_unmap,
534 .iova_to_phys = mtk_iommu_iova_to_phys,
535 .add_device = mtk_iommu_add_device,
536 .remove_device = mtk_iommu_remove_device,
537 .pgsize_bitmap = ~0UL << MT2701_IOMMU_PAGE_SHIFT,
538 };
539
540 static const struct of_device_id mtk_iommu_of_ids[] = {
541 { .compatible = "mediatek,mt2701-m4u", },
542 {}
543 };
544
545 static const struct component_master_ops mtk_iommu_com_ops = {
546 .bind = mtk_iommu_bind,
547 .unbind = mtk_iommu_unbind,
548 };
549
550 static int mtk_iommu_probe(struct platform_device *pdev)
551 {
552 struct mtk_iommu_data *data;
553 struct device *dev = &pdev->dev;
554 struct resource *res;
555 struct component_match *match = NULL;
556 struct of_phandle_args larb_spec;
557 struct of_phandle_iterator it;
558 void *protect;
559 int larb_nr, ret, err;
560
561 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
562 if (!data)
563 return -ENOMEM;
564
565 data->dev = dev;
566
567 /* Protect memory. HW will access here while translation fault.*/
568 protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2,
569 GFP_KERNEL | GFP_DMA);
570 if (!protect)
571 return -ENOMEM;
572 data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN);
573
574 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
575 data->base = devm_ioremap_resource(dev, res);
576 if (IS_ERR(data->base))
577 return PTR_ERR(data->base);
578
579 data->irq = platform_get_irq(pdev, 0);
580 if (data->irq < 0)
581 return data->irq;
582
583 data->bclk = devm_clk_get(dev, "bclk");
584 if (IS_ERR(data->bclk))
585 return PTR_ERR(data->bclk);
586
587 larb_nr = 0;
588 of_for_each_phandle(&it, err, dev->of_node,
589 "mediatek,larbs", NULL, 0) {
590 struct platform_device *plarbdev;
591 int count = of_phandle_iterator_args(&it, larb_spec.args,
592 MAX_PHANDLE_ARGS);
593
594 if (count)
595 continue;
596
597 larb_spec.np = of_node_get(it.node);
598 if (!of_device_is_available(larb_spec.np))
599 continue;
600
601 plarbdev = of_find_device_by_node(larb_spec.np);
602 if (!plarbdev) {
603 plarbdev = of_platform_device_create(
604 larb_spec.np, NULL,
605 platform_bus_type.dev_root);
606 if (!plarbdev) {
607 of_node_put(larb_spec.np);
608 return -EPROBE_DEFER;
609 }
610 }
611
612 data->smi_imu.larb_imu[larb_nr].dev = &plarbdev->dev;
613 component_match_add_release(dev, &match, release_of,
614 compare_of, larb_spec.np);
615 larb_nr++;
616 }
617
618 data->smi_imu.larb_nr = larb_nr;
619
620 platform_set_drvdata(pdev, data);
621
622 ret = mtk_iommu_hw_init(data);
623 if (ret)
624 return ret;
625
626 ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL,
627 dev_name(&pdev->dev));
628 if (ret)
629 return ret;
630
631 iommu_device_set_ops(&data->iommu, &mtk_iommu_ops);
632
633 ret = iommu_device_register(&data->iommu);
634 if (ret)
635 return ret;
636
637 if (!iommu_present(&platform_bus_type))
638 bus_set_iommu(&platform_bus_type, &mtk_iommu_ops);
639
640 return component_master_add_with_match(dev, &mtk_iommu_com_ops, match);
641 }
642
643 static int mtk_iommu_remove(struct platform_device *pdev)
644 {
645 struct mtk_iommu_data *data = platform_get_drvdata(pdev);
646
647 iommu_device_sysfs_remove(&data->iommu);
648 iommu_device_unregister(&data->iommu);
649
650 if (iommu_present(&platform_bus_type))
651 bus_set_iommu(&platform_bus_type, NULL);
652
653 clk_disable_unprepare(data->bclk);
654 devm_free_irq(&pdev->dev, data->irq, data);
655 component_master_del(&pdev->dev, &mtk_iommu_com_ops);
656 return 0;
657 }
658
659 static int __maybe_unused mtk_iommu_suspend(struct device *dev)
660 {
661 struct mtk_iommu_data *data = dev_get_drvdata(dev);
662 struct mtk_iommu_suspend_reg *reg = &data->reg;
663 void __iomem *base = data->base;
664
665 reg->standard_axi_mode = readl_relaxed(base +
666 REG_MMU_STANDARD_AXI_MODE);
667 reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM);
668 reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG);
669 reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL);
670 return 0;
671 }
672
673 static int __maybe_unused mtk_iommu_resume(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 writel_relaxed(data->m4u_dom->pgt_pa, base + REG_MMU_PT_BASE_ADDR);
680 writel_relaxed(reg->standard_axi_mode,
681 base + REG_MMU_STANDARD_AXI_MODE);
682 writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM);
683 writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG);
684 writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL);
685 writel_relaxed(data->protect_base, base + REG_MMU_IVRP_PADDR);
686 return 0;
687 }
688
689 static const struct dev_pm_ops mtk_iommu_pm_ops = {
690 SET_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume)
691 };
692
693 static struct platform_driver mtk_iommu_driver = {
694 .probe = mtk_iommu_probe,
695 .remove = mtk_iommu_remove,
696 .driver = {
697 .name = "mtk-iommu-v1",
698 .of_match_table = mtk_iommu_of_ids,
699 .pm = &mtk_iommu_pm_ops,
700 }
701 };
702
703 static int __init m4u_init(void)
704 {
705 return platform_driver_register(&mtk_iommu_driver);
706 }
707
708 static void __exit m4u_exit(void)
709 {
710 return platform_driver_unregister(&mtk_iommu_driver);
711 }
712
713 subsys_initcall(m4u_init);
714 module_exit(m4u_exit);
715
716 MODULE_DESCRIPTION("IOMMU API for MTK architected m4u v1 implementations");
717 MODULE_AUTHOR("Honghui Zhang <honghui.zhang@mediatek.com>");
718 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support