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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/bug.h>
15#include <linux/clk.h>
16#include <linux/component.h>
17#include <linux/device.h>
18#include <linux/dma-iommu.h>
19#include <linux/err.h>
20#include <linux/interrupt.h>
21#include <linux/io.h>
22#include <linux/iommu.h>
23#include <linux/iopoll.h>
24#include <linux/list.h>
25#include <linux/of_address.h>
26#include <linux/of_iommu.h>
27#include <linux/of_irq.h>
28#include <linux/of_platform.h>
29#include <linux/platform_device.h>
30#include <linux/slab.h>
31#include <linux/spinlock.h>
32#include <asm/barrier.h>
33#include <dt-bindings/memory/mt8173-larb-port.h>
34#include <soc/mediatek/smi.h>
35
36#include "io-pgtable.h"
37
38#define REG_MMU_PT_BASE_ADDR 0x000
39
40#define REG_MMU_INVALIDATE 0x020
41#define F_ALL_INVLD 0x2
42#define F_MMU_INV_RANGE 0x1
43
44#define REG_MMU_INVLD_START_A 0x024
45#define REG_MMU_INVLD_END_A 0x028
46
47#define REG_MMU_INV_SEL 0x038
48#define F_INVLD_EN0 BIT(0)
49#define F_INVLD_EN1 BIT(1)
50
51#define REG_MMU_STANDARD_AXI_MODE 0x048
52#define REG_MMU_DCM_DIS 0x050
53
54#define REG_MMU_CTRL_REG 0x110
55#define F_MMU_PREFETCH_RT_REPLACE_MOD BIT(4)
56#define F_MMU_TF_PROTECT_SEL(prot) (((prot) & 0x3) << 5)
57
58#define REG_MMU_IVRP_PADDR 0x114
59#define F_MMU_IVRP_PA_SET(pa) ((pa) >> 1)
60
61#define REG_MMU_INT_CONTROL0 0x120
62#define F_L2_MULIT_HIT_EN BIT(0)
63#define F_TABLE_WALK_FAULT_INT_EN BIT(1)
64#define F_PREETCH_FIFO_OVERFLOW_INT_EN BIT(2)
65#define F_MISS_FIFO_OVERFLOW_INT_EN BIT(3)
66#define F_PREFETCH_FIFO_ERR_INT_EN BIT(5)
67#define F_MISS_FIFO_ERR_INT_EN BIT(6)
68#define F_INT_CLR_BIT BIT(12)
69
70#define REG_MMU_INT_MAIN_CONTROL 0x124
71#define F_INT_TRANSLATION_FAULT BIT(0)
72#define F_INT_MAIN_MULTI_HIT_FAULT BIT(1)
73#define F_INT_INVALID_PA_FAULT BIT(2)
74#define F_INT_ENTRY_REPLACEMENT_FAULT BIT(3)
75#define F_INT_TLB_MISS_FAULT BIT(4)
76#define F_INT_MISS_TRANSACTION_FIFO_FAULT BIT(5)
77#define F_INT_PRETETCH_TRANSATION_FIFO_FAULT BIT(6)
78
79#define REG_MMU_CPE_DONE 0x12C
80
81#define REG_MMU_FAULT_ST1 0x134
82
83#define REG_MMU_FAULT_VA 0x13c
84#define F_MMU_FAULT_VA_MSK 0xfffff000
85#define F_MMU_FAULT_VA_WRITE_BIT BIT(1)
86#define F_MMU_FAULT_VA_LAYER_BIT BIT(0)
87
88#define REG_MMU_INVLD_PA 0x140
89#define REG_MMU_INT_ID 0x150
90#define F_MMU0_INT_ID_LARB_ID(a) (((a) >> 7) & 0x7)
91#define F_MMU0_INT_ID_PORT_ID(a) (((a) >> 2) & 0x1f)
92
93#define MTK_PROTECT_PA_ALIGN 128
94
95struct mtk_iommu_suspend_reg {
96 u32 standard_axi_mode;
97 u32 dcm_dis;
98 u32 ctrl_reg;
99 u32 int_control0;
100 u32 int_main_control;
101};
102
103struct mtk_iommu_client_priv {
104 struct list_head client;
105 unsigned int mtk_m4u_id;
106 struct device *m4udev;
107};
108
109struct mtk_iommu_domain {
110 spinlock_t pgtlock; /* lock for page table */
111
112 struct io_pgtable_cfg cfg;
113 struct io_pgtable_ops *iop;
114
115 struct iommu_domain domain;
116};
117
118struct mtk_iommu_data {
119 void __iomem *base;
120 int irq;
121 struct device *dev;
122 struct clk *bclk;
123 phys_addr_t protect_base; /* protect memory base */
124 struct mtk_iommu_suspend_reg reg;
125 struct mtk_iommu_domain *m4u_dom;
126 struct iommu_group *m4u_group;
127 struct mtk_smi_iommu smi_imu; /* SMI larb iommu info */
128};
129
130static struct iommu_ops mtk_iommu_ops;
131
132static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
133{
134 return container_of(dom, struct mtk_iommu_domain, domain);
135}
136
137static void mtk_iommu_tlb_flush_all(void *cookie)
138{
139 struct mtk_iommu_data *data = cookie;
140
141 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, data->base + REG_MMU_INV_SEL);
142 writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE);
143 wmb(); /* Make sure the tlb flush all done */
144}
145
146static void mtk_iommu_tlb_add_flush_nosync(unsigned long iova, size_t size,
147 size_t granule, bool leaf,
148 void *cookie)
149{
150 struct mtk_iommu_data *data = cookie;
151
152 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, data->base + REG_MMU_INV_SEL);
153
154 writel_relaxed(iova, data->base + REG_MMU_INVLD_START_A);
155 writel_relaxed(iova + size - 1, data->base + REG_MMU_INVLD_END_A);
156 writel_relaxed(F_MMU_INV_RANGE, data->base + REG_MMU_INVALIDATE);
157}
158
159static void mtk_iommu_tlb_sync(void *cookie)
160{
161 struct mtk_iommu_data *data = cookie;
162 int ret;
163 u32 tmp;
164
165 ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE, tmp,
166 tmp != 0, 10, 100000);
167 if (ret) {
168 dev_warn(data->dev,
169 "Partial TLB flush timed out, falling back to full flush\n");
170 mtk_iommu_tlb_flush_all(cookie);
171 }
172 /* Clear the CPE status */
173 writel_relaxed(0, data->base + REG_MMU_CPE_DONE);
174}
175
176static const struct iommu_gather_ops mtk_iommu_gather_ops = {
177 .tlb_flush_all = mtk_iommu_tlb_flush_all,
178 .tlb_add_flush = mtk_iommu_tlb_add_flush_nosync,
179 .tlb_sync = mtk_iommu_tlb_sync,
180};
181
182static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
183{
184 struct mtk_iommu_data *data = dev_id;
185 struct mtk_iommu_domain *dom = data->m4u_dom;
186 u32 int_state, regval, fault_iova, fault_pa;
187 unsigned int fault_larb, fault_port;
188 bool layer, write;
189
190 /* Read error info from registers */
191 int_state = readl_relaxed(data->base + REG_MMU_FAULT_ST1);
192 fault_iova = readl_relaxed(data->base + REG_MMU_FAULT_VA);
193 layer = fault_iova & F_MMU_FAULT_VA_LAYER_BIT;
194 write = fault_iova & F_MMU_FAULT_VA_WRITE_BIT;
195 fault_iova &= F_MMU_FAULT_VA_MSK;
196 fault_pa = readl_relaxed(data->base + REG_MMU_INVLD_PA);
197 regval = readl_relaxed(data->base + REG_MMU_INT_ID);
198 fault_larb = F_MMU0_INT_ID_LARB_ID(regval);
199 fault_port = F_MMU0_INT_ID_PORT_ID(regval);
200
201 if (report_iommu_fault(&dom->domain, data->dev, fault_iova,
202 write ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ)) {
203 dev_err_ratelimited(
204 data->dev,
205 "fault type=0x%x iova=0x%x pa=0x%x larb=%d port=%d layer=%d %s\n",
206 int_state, fault_iova, fault_pa, fault_larb, fault_port,
207 layer, write ? "write" : "read");
208 }
209
210 /* Interrupt clear */
211 regval = readl_relaxed(data->base + REG_MMU_INT_CONTROL0);
212 regval |= F_INT_CLR_BIT;
213 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL0);
214
215 mtk_iommu_tlb_flush_all(data);
216
217 return IRQ_HANDLED;
218}
219
220static void mtk_iommu_config(struct mtk_iommu_data *data,
221 struct device *dev, bool enable)
222{
223 struct mtk_iommu_client_priv *head, *cur, *next;
224 struct mtk_smi_larb_iommu *larb_mmu;
225 unsigned int larbid, portid;
226
227 head = dev->archdata.iommu;
228 list_for_each_entry_safe(cur, next, &head->client, client) {
229 larbid = MTK_M4U_TO_LARB(cur->mtk_m4u_id);
230 portid = MTK_M4U_TO_PORT(cur->mtk_m4u_id);
231 larb_mmu = &data->smi_imu.larb_imu[larbid];
232
233 dev_dbg(dev, "%s iommu port: %d\n",
234 enable ? "enable" : "disable", portid);
235
236 if (enable)
237 larb_mmu->mmu |= MTK_SMI_MMU_EN(portid);
238 else
239 larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid);
240 }
241}
242
243static int mtk_iommu_domain_finalise(struct mtk_iommu_data *data)
244{
245 struct mtk_iommu_domain *dom = data->m4u_dom;
246
247 spin_lock_init(&dom->pgtlock);
248
249 dom->cfg = (struct io_pgtable_cfg) {
250 .quirks = IO_PGTABLE_QUIRK_ARM_NS |
251 IO_PGTABLE_QUIRK_NO_PERMS |
252 IO_PGTABLE_QUIRK_TLBI_ON_MAP,
253 .pgsize_bitmap = mtk_iommu_ops.pgsize_bitmap,
254 .ias = 32,
255 .oas = 32,
256 .tlb = &mtk_iommu_gather_ops,
257 .iommu_dev = data->dev,
258 };
259
260 dom->iop = alloc_io_pgtable_ops(ARM_V7S, &dom->cfg, data);
261 if (!dom->iop) {
262 dev_err(data->dev, "Failed to alloc io pgtable\n");
263 return -EINVAL;
264 }
265
266 /* Update our support page sizes bitmap */
267 mtk_iommu_ops.pgsize_bitmap = dom->cfg.pgsize_bitmap;
268
269 writel(data->m4u_dom->cfg.arm_v7s_cfg.ttbr[0],
270 data->base + REG_MMU_PT_BASE_ADDR);
271 return 0;
272}
273
274static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
275{
276 struct mtk_iommu_domain *dom;
277
278 if (type != IOMMU_DOMAIN_DMA)
279 return NULL;
280
281 dom = kzalloc(sizeof(*dom), GFP_KERNEL);
282 if (!dom)
283 return NULL;
284
285 if (iommu_get_dma_cookie(&dom->domain)) {
286 kfree(dom);
287 return NULL;
288 }
289
290 dom->domain.geometry.aperture_start = 0;
291 dom->domain.geometry.aperture_end = DMA_BIT_MASK(32);
292 dom->domain.geometry.force_aperture = true;
293
294 return &dom->domain;
295}
296
297static void mtk_iommu_domain_free(struct iommu_domain *domain)
298{
299 iommu_put_dma_cookie(domain);
300 kfree(to_mtk_domain(domain));
301}
302
303static int mtk_iommu_attach_device(struct iommu_domain *domain,
304 struct device *dev)
305{
306 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
307 struct mtk_iommu_client_priv *priv = dev->archdata.iommu;
308 struct mtk_iommu_data *data;
309 int ret;
310
311 if (!priv)
312 return -ENODEV;
313
314 data = dev_get_drvdata(priv->m4udev);
315 if (!data->m4u_dom) {
316 data->m4u_dom = dom;
317 ret = mtk_iommu_domain_finalise(data);
318 if (ret) {
319 data->m4u_dom = NULL;
320 return ret;
321 }
322 } else if (data->m4u_dom != dom) {
323 /* All the client devices should be in the same m4u domain */
324 dev_err(dev, "try to attach into the error iommu domain\n");
325 return -EPERM;
326 }
327
328 mtk_iommu_config(data, dev, true);
329 return 0;
330}
331
332static void mtk_iommu_detach_device(struct iommu_domain *domain,
333 struct device *dev)
334{
335 struct mtk_iommu_client_priv *priv = dev->archdata.iommu;
336 struct mtk_iommu_data *data;
337
338 if (!priv)
339 return;
340
341 data = dev_get_drvdata(priv->m4udev);
342 mtk_iommu_config(data, dev, false);
343}
344
345static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,
346 phys_addr_t paddr, size_t size, int prot)
347{
348 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
349 unsigned long flags;
350 int ret;
351
352 spin_lock_irqsave(&dom->pgtlock, flags);
353 ret = dom->iop->map(dom->iop, iova, paddr, size, prot);
354 spin_unlock_irqrestore(&dom->pgtlock, flags);
355
356 return ret;
357}
358
359static size_t mtk_iommu_unmap(struct iommu_domain *domain,
360 unsigned long iova, size_t size)
361{
362 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
363 unsigned long flags;
364 size_t unmapsz;
365
366 spin_lock_irqsave(&dom->pgtlock, flags);
367 unmapsz = dom->iop->unmap(dom->iop, iova, size);
368 spin_unlock_irqrestore(&dom->pgtlock, flags);
369
370 return unmapsz;
371}
372
373static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
374 dma_addr_t iova)
375{
376 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
377 unsigned long flags;
378 phys_addr_t pa;
379
380 spin_lock_irqsave(&dom->pgtlock, flags);
381 pa = dom->iop->iova_to_phys(dom->iop, iova);
382 spin_unlock_irqrestore(&dom->pgtlock, flags);
383
384 return pa;
385}
386
387static int mtk_iommu_add_device(struct device *dev)
388{
389 struct iommu_group *group;
390
391 if (!dev->archdata.iommu) /* Not a iommu client device */
392 return -ENODEV;
393
394 group = iommu_group_get_for_dev(dev);
395 if (IS_ERR(group))
396 return PTR_ERR(group);
397
398 iommu_group_put(group);
399 return 0;
400}
401
402static void mtk_iommu_remove_device(struct device *dev)
403{
404 struct mtk_iommu_client_priv *head, *cur, *next;
405
406 head = dev->archdata.iommu;
407 if (!head)
408 return;
409
410 list_for_each_entry_safe(cur, next, &head->client, client) {
411 list_del(&cur->client);
412 kfree(cur);
413 }
414 kfree(head);
415 dev->archdata.iommu = NULL;
416
417 iommu_group_remove_device(dev);
418}
419
420static struct iommu_group *mtk_iommu_device_group(struct device *dev)
421{
422 struct mtk_iommu_data *data;
423 struct mtk_iommu_client_priv *priv;
424
425 priv = dev->archdata.iommu;
426 if (!priv)
427 return ERR_PTR(-ENODEV);
428
429 /* All the client devices are in the same m4u iommu-group */
430 data = dev_get_drvdata(priv->m4udev);
431 if (!data->m4u_group) {
432 data->m4u_group = iommu_group_alloc();
433 if (IS_ERR(data->m4u_group))
434 dev_err(dev, "Failed to allocate M4U IOMMU group\n");
435 }
436 return data->m4u_group;
437}
438
439static int mtk_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
440{
441 struct mtk_iommu_client_priv *head, *priv, *next;
442 struct platform_device *m4updev;
443
444 if (args->args_count != 1) {
445 dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n",
446 args->args_count);
447 return -EINVAL;
448 }
449
450 if (!dev->archdata.iommu) {
451 /* Get the m4u device */
452 m4updev = of_find_device_by_node(args->np);
453 of_node_put(args->np);
454 if (WARN_ON(!m4updev))
455 return -EINVAL;
456
457 head = kzalloc(sizeof(*head), GFP_KERNEL);
458 if (!head)
459 return -ENOMEM;
460
461 dev->archdata.iommu = head;
462 INIT_LIST_HEAD(&head->client);
463 head->m4udev = &m4updev->dev;
464 } else {
465 head = dev->archdata.iommu;
466 }
467
468 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
469 if (!priv)
470 goto err_free_mem;
471
472 priv->mtk_m4u_id = args->args[0];
473 list_add_tail(&priv->client, &head->client);
474
475 return 0;
476
477err_free_mem:
478 list_for_each_entry_safe(priv, next, &head->client, client)
479 kfree(priv);
480 kfree(head);
481 dev->archdata.iommu = NULL;
482 return -ENOMEM;
483}
484
485static struct iommu_ops mtk_iommu_ops = {
486 .domain_alloc = mtk_iommu_domain_alloc,
487 .domain_free = mtk_iommu_domain_free,
488 .attach_dev = mtk_iommu_attach_device,
489 .detach_dev = mtk_iommu_detach_device,
490 .map = mtk_iommu_map,
491 .unmap = mtk_iommu_unmap,
492 .map_sg = default_iommu_map_sg,
493 .iova_to_phys = mtk_iommu_iova_to_phys,
494 .add_device = mtk_iommu_add_device,
495 .remove_device = mtk_iommu_remove_device,
496 .device_group = mtk_iommu_device_group,
497 .of_xlate = mtk_iommu_of_xlate,
498 .pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
499};
500
501static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
502{
503 u32 regval;
504 int ret;
505
506 ret = clk_prepare_enable(data->bclk);
507 if (ret) {
508 dev_err(data->dev, "Failed to enable iommu bclk(%d)\n", ret);
509 return ret;
510 }
511
512 regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
513 F_MMU_TF_PROTECT_SEL(2);
514 writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
515
516 regval = F_L2_MULIT_HIT_EN |
517 F_TABLE_WALK_FAULT_INT_EN |
518 F_PREETCH_FIFO_OVERFLOW_INT_EN |
519 F_MISS_FIFO_OVERFLOW_INT_EN |
520 F_PREFETCH_FIFO_ERR_INT_EN |
521 F_MISS_FIFO_ERR_INT_EN;
522 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL0);
523
524 regval = F_INT_TRANSLATION_FAULT |
525 F_INT_MAIN_MULTI_HIT_FAULT |
526 F_INT_INVALID_PA_FAULT |
527 F_INT_ENTRY_REPLACEMENT_FAULT |
528 F_INT_TLB_MISS_FAULT |
529 F_INT_MISS_TRANSACTION_FIFO_FAULT |
530 F_INT_PRETETCH_TRANSATION_FIFO_FAULT;
531 writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL);
532
533 writel_relaxed(F_MMU_IVRP_PA_SET(data->protect_base),
534 data->base + REG_MMU_IVRP_PADDR);
535
536 writel_relaxed(0, data->base + REG_MMU_DCM_DIS);
537 writel_relaxed(0, data->base + REG_MMU_STANDARD_AXI_MODE);
538
539 if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
540 dev_name(data->dev), (void *)data)) {
541 writel_relaxed(0, data->base + REG_MMU_PT_BASE_ADDR);
542 clk_disable_unprepare(data->bclk);
543 dev_err(data->dev, "Failed @ IRQ-%d Request\n", data->irq);
544 return -ENODEV;
545 }
546
547 return 0;
548}
549
550static int compare_of(struct device *dev, void *data)
551{
552 return dev->of_node == data;
553}
554
555static int mtk_iommu_bind(struct device *dev)
556{
557 struct mtk_iommu_data *data = dev_get_drvdata(dev);
558
559 return component_bind_all(dev, &data->smi_imu);
560}
561
562static void mtk_iommu_unbind(struct device *dev)
563{
564 struct mtk_iommu_data *data = dev_get_drvdata(dev);
565
566 component_unbind_all(dev, &data->smi_imu);
567}
568
569static const struct component_master_ops mtk_iommu_com_ops = {
570 .bind = mtk_iommu_bind,
571 .unbind = mtk_iommu_unbind,
572};
573
574static int mtk_iommu_probe(struct platform_device *pdev)
575{
576 struct mtk_iommu_data *data;
577 struct device *dev = &pdev->dev;
578 struct resource *res;
579 struct component_match *match = NULL;
580 void *protect;
581 int i, larb_nr, ret;
582
583 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
584 if (!data)
585 return -ENOMEM;
586 data->dev = dev;
587
588 /* Protect memory. HW will access here while translation fault.*/
589 protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2, GFP_KERNEL);
590 if (!protect)
591 return -ENOMEM;
592 data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN);
593
594 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
595 data->base = devm_ioremap_resource(dev, res);
596 if (IS_ERR(data->base))
597 return PTR_ERR(data->base);
598
599 data->irq = platform_get_irq(pdev, 0);
600 if (data->irq < 0)
601 return data->irq;
602
603 data->bclk = devm_clk_get(dev, "bclk");
604 if (IS_ERR(data->bclk))
605 return PTR_ERR(data->bclk);
606
607 larb_nr = of_count_phandle_with_args(dev->of_node,
608 "mediatek,larbs", NULL);
609 if (larb_nr < 0)
610 return larb_nr;
611 data->smi_imu.larb_nr = larb_nr;
612
613 for (i = 0; i < larb_nr; i++) {
614 struct device_node *larbnode;
615 struct platform_device *plarbdev;
616
617 larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i);
618 if (!larbnode)
619 return -EINVAL;
620
621 if (!of_device_is_available(larbnode))
622 continue;
623
624 plarbdev = of_find_device_by_node(larbnode);
625 of_node_put(larbnode);
626 if (!plarbdev) {
627 plarbdev = of_platform_device_create(
628 larbnode, NULL,
629 platform_bus_type.dev_root);
630 if (!plarbdev)
631 return -EPROBE_DEFER;
632 }
633 data->smi_imu.larb_imu[i].dev = &plarbdev->dev;
634
635 component_match_add(dev, &match, compare_of, larbnode);
636 }
637
638 platform_set_drvdata(pdev, data);
639
640 ret = mtk_iommu_hw_init(data);
641 if (ret)
642 return ret;
643
644 if (!iommu_present(&platform_bus_type))
645 bus_set_iommu(&platform_bus_type, &mtk_iommu_ops);
646
647 return component_master_add_with_match(dev, &mtk_iommu_com_ops, match);
648}
649
650static int mtk_iommu_remove(struct platform_device *pdev)
651{
652 struct mtk_iommu_data *data = platform_get_drvdata(pdev);
653
654 if (iommu_present(&platform_bus_type))
655 bus_set_iommu(&platform_bus_type, NULL);
656
657 free_io_pgtable_ops(data->m4u_dom->iop);
658 clk_disable_unprepare(data->bclk);
659 devm_free_irq(&pdev->dev, data->irq, data);
660 component_master_del(&pdev->dev, &mtk_iommu_com_ops);
661 return 0;
662}
663
664static int __maybe_unused mtk_iommu_suspend(struct device *dev)
665{
666 struct mtk_iommu_data *data = dev_get_drvdata(dev);
667 struct mtk_iommu_suspend_reg *reg = &data->reg;
668 void __iomem *base = data->base;
669
670 reg->standard_axi_mode = readl_relaxed(base +
671 REG_MMU_STANDARD_AXI_MODE);
672 reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM_DIS);
673 reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG);
674 reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL0);
675 reg->int_main_control = readl_relaxed(base + REG_MMU_INT_MAIN_CONTROL);
676 return 0;
677}
678
679static int __maybe_unused mtk_iommu_resume(struct device *dev)
680{
681 struct mtk_iommu_data *data = dev_get_drvdata(dev);
682 struct mtk_iommu_suspend_reg *reg = &data->reg;
683 void __iomem *base = data->base;
684
685 writel_relaxed(data->m4u_dom->cfg.arm_v7s_cfg.ttbr[0],
686 base + REG_MMU_PT_BASE_ADDR);
687 writel_relaxed(reg->standard_axi_mode,
688 base + REG_MMU_STANDARD_AXI_MODE);
689 writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM_DIS);
690 writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG);
691 writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL0);
692 writel_relaxed(reg->int_main_control, base + REG_MMU_INT_MAIN_CONTROL);
693 writel_relaxed(F_MMU_IVRP_PA_SET(data->protect_base),
694 base + REG_MMU_IVRP_PADDR);
695 return 0;
696}
697
698const struct dev_pm_ops mtk_iommu_pm_ops = {
699 SET_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume)
700};
701
702static const struct of_device_id mtk_iommu_of_ids[] = {
703 { .compatible = "mediatek,mt8173-m4u", },
704 {}
705};
706
707static 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
717static int mtk_iommu_init_fn(struct device_node *np)
718{
719 int ret;
720 struct platform_device *pdev;
721
722 pdev = of_platform_device_create(np, NULL, platform_bus_type.dev_root);
723 if (!pdev)
724 return -ENOMEM;
725
726 ret = platform_driver_register(&mtk_iommu_driver);
727 if (ret) {
728 pr_err("%s: Failed to register driver\n", __func__);
729 return ret;
730 }
731
732 of_iommu_set_ops(np, &mtk_iommu_ops);
733 return 0;
734}
735
736IOMMU_OF_DECLARE(mtkm4u, "mediatek,mt8173-m4u", mtk_iommu_init_fn);