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powerpc/mm: Drop the unnecessary region check
[linux-2.6-block.git] / drivers / iommu / mtk_iommu_v1.c
CommitLineData
b17336c5 1/*
d4cf5bbd
PG		 2 * IOMMU API for MTK architected m4u v1 implementations
3 *
b17336c5
HZ		 4 * Copyright (c) 2015-2016 MediaTek Inc.
5 * Author: Honghui Zhang <honghui.zhang@mediatek.com>
6 *
7 * Based on driver/iommu/mtk_iommu.c
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
57c8a661 18#include <linux/memblock.h>
b17336c5
HZ		 19#include <linux/bug.h>
20#include <linux/clk.h>
21#include <linux/component.h>
22#include <linux/device.h>
745b6e74 23#include <linux/dma-mapping.h>
b17336c5
HZ		 24#include <linux/dma-iommu.h>
25#include <linux/err.h>
26#include <linux/interrupt.h>
27#include <linux/io.h>
28#include <linux/iommu.h>
29#include <linux/iopoll.h>
b17336c5
HZ		 30#include <linux/list.h>
31#include <linux/of_address.h>
32#include <linux/of_iommu.h>
33#include <linux/of_irq.h>
34#include <linux/of_platform.h>
35#include <linux/platform_device.h>
36#include <linux/slab.h>
37#include <linux/spinlock.h>
38#include <asm/barrier.h>
39#include <asm/dma-iommu.h>
d4cf5bbd 40#include <linux/init.h>
b17336c5
HZ		 41#include <dt-bindings/memory/mt2701-larb-port.h>
42#include <soc/mediatek/smi.h>
43#include "mtk_iommu.h"
44
45#define REG_MMU_PT_BASE_ADDR 0x000
46
47#define F_ALL_INVLD 0x2
48#define F_MMU_INV_RANGE 0x1
49#define F_INVLD_EN0 BIT(0)
50#define F_INVLD_EN1 BIT(1)
51
52#define F_MMU_FAULT_VA_MSK 0xfffff000
53#define MTK_PROTECT_PA_ALIGN 128
54
55#define REG_MMU_CTRL_REG 0x210
56#define F_MMU_CTRL_COHERENT_EN BIT(8)
57#define REG_MMU_IVRP_PADDR 0x214
58#define REG_MMU_INT_CONTROL 0x220
59#define F_INT_TRANSLATION_FAULT BIT(0)
60#define F_INT_MAIN_MULTI_HIT_FAULT BIT(1)
61#define F_INT_INVALID_PA_FAULT BIT(2)
62#define F_INT_ENTRY_REPLACEMENT_FAULT BIT(3)
63#define F_INT_TABLE_WALK_FAULT BIT(4)
64#define F_INT_TLB_MISS_FAULT BIT(5)
65#define F_INT_PFH_DMA_FIFO_OVERFLOW BIT(6)
66#define F_INT_MISS_DMA_FIFO_OVERFLOW BIT(7)
67
68#define F_MMU_TF_PROTECT_SEL(prot) (((prot) & 0x3) << 5)
69#define F_INT_CLR_BIT BIT(12)
70
71#define REG_MMU_FAULT_ST 0x224
72#define REG_MMU_FAULT_VA 0x228
73#define REG_MMU_INVLD_PA 0x22C
74#define REG_MMU_INT_ID 0x388
75#define REG_MMU_INVALIDATE 0x5c0
76#define REG_MMU_INVLD_START_A 0x5c4
77#define REG_MMU_INVLD_END_A 0x5c8
78
79#define REG_MMU_INV_SEL 0x5d8
80#define REG_MMU_STANDARD_AXI_MODE 0x5e8
81
82#define REG_MMU_DCM 0x5f0
83#define F_MMU_DCM_ON BIT(1)
84#define REG_MMU_CPE_DONE 0x60c
85#define F_DESC_VALID 0x2
86#define F_DESC_NONSEC BIT(3)
87#define MT2701_M4U_TF_LARB(TF) (6 - (((TF) >> 13) & 0x7))
88#define MT2701_M4U_TF_PORT(TF) (((TF) >> 8) & 0xF)
89/* MTK generation one iommu HW only support 4K size mapping */
90#define MT2701_IOMMU_PAGE_SHIFT 12
91#define MT2701_IOMMU_PAGE_SIZE (1UL << MT2701_IOMMU_PAGE_SHIFT)
92
93/*
94 * MTK m4u support 4GB iova address space, and only support 4K page
95 * mapping. So the pagetable size should be exactly as 4M.
96 */
97#define M2701_IOMMU_PGT_SIZE SZ_4M
98
99struct mtk_iommu_domain {
100 spinlock_t pgtlock; /* lock for page table */
101 struct iommu_domain domain;
102 u32 *pgt_va;
103 dma_addr_t pgt_pa;
104 struct mtk_iommu_data *data;
105};
106
107static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
108{
109 return container_of(dom, struct mtk_iommu_domain, domain);
110}
111
112static const int mt2701_m4u_in_larb[] = {
113 LARB0_PORT_OFFSET, LARB1_PORT_OFFSET,
114 LARB2_PORT_OFFSET, LARB3_PORT_OFFSET
115};
116
117static inline int mt2701_m4u_to_larb(int id)
118{
119 int i;
120
121 for (i = ARRAY_SIZE(mt2701_m4u_in_larb) - 1; i >= 0; i--)
122 if ((id) >= mt2701_m4u_in_larb[i])
123 return i;
124
125 return 0;
126}
127
128static inline int mt2701_m4u_to_port(int id)
129{
130 int larb = mt2701_m4u_to_larb(id);
131
132 return id - mt2701_m4u_in_larb[larb];
133}
134
135static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data)
136{
137 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
138 data->base + REG_MMU_INV_SEL);
139 writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE);
140 wmb(); /* Make sure the tlb flush all done */
141}
142
143static void mtk_iommu_tlb_flush_range(struct mtk_iommu_data *data,
144 unsigned long iova, size_t size)
145{
146 int ret;
147 u32 tmp;
148
149 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
150 data->base + REG_MMU_INV_SEL);
151 writel_relaxed(iova & F_MMU_FAULT_VA_MSK,
152 data->base + REG_MMU_INVLD_START_A);
153 writel_relaxed((iova + size - 1) & F_MMU_FAULT_VA_MSK,
154 data->base + REG_MMU_INVLD_END_A);
155 writel_relaxed(F_MMU_INV_RANGE, data->base + REG_MMU_INVALIDATE);
156
157 ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE,
158 tmp, tmp != 0, 10, 100000);
159 if (ret) {
160 dev_warn(data->dev,
161 "Partial TLB flush timed out, falling back to full flush\n");
162 mtk_iommu_tlb_flush_all(data);
163 }
164 /* Clear the CPE status */
165 writel_relaxed(0, data->base + REG_MMU_CPE_DONE);
166}
167
168static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
169{
170 struct mtk_iommu_data *data = dev_id;
171 struct mtk_iommu_domain *dom = data->m4u_dom;
172 u32 int_state, regval, fault_iova, fault_pa;
173 unsigned int fault_larb, fault_port;
174
175 /* Read error information from registers */
176 int_state = readl_relaxed(data->base + REG_MMU_FAULT_ST);
177 fault_iova = readl_relaxed(data->base + REG_MMU_FAULT_VA);
178
179 fault_iova &= F_MMU_FAULT_VA_MSK;
180 fault_pa = readl_relaxed(data->base + REG_MMU_INVLD_PA);
181 regval = readl_relaxed(data->base + REG_MMU_INT_ID);
182 fault_larb = MT2701_M4U_TF_LARB(regval);
183 fault_port = MT2701_M4U_TF_PORT(regval);
184
185 /*
186 * MTK v1 iommu HW could not determine whether the fault is read or
187 * write fault, report as read fault.
188 */
189 if (report_iommu_fault(&dom->domain, data->dev, fault_iova,
190 IOMMU_FAULT_READ))
191 dev_err_ratelimited(data->dev,
192 "fault type=0x%x iova=0x%x pa=0x%x larb=%d port=%d\n",
193 int_state, fault_iova, fault_pa,
194 fault_larb, fault_port);
195
196 /* Interrupt clear */
197 regval = readl_relaxed(data->base + REG_MMU_INT_CONTROL);
198 regval |= F_INT_CLR_BIT;
199 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL);
200
201 mtk_iommu_tlb_flush_all(data);
202
203 return IRQ_HANDLED;
204}
205
206static void mtk_iommu_config(struct mtk_iommu_data *data,
207 struct device *dev, bool enable)
208{
b17336c5
HZ		 209 struct mtk_smi_larb_iommu *larb_mmu;
210 unsigned int larbid, portid;
a9bf2eec 211 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
84672f19 212 int i;
b17336c5 213
84672f19
RM		 214 for (i = 0; i < fwspec->num_ids; ++i) {
215 larbid = mt2701_m4u_to_larb(fwspec->ids[i]);
216 portid = mt2701_m4u_to_port(fwspec->ids[i]);
b17336c5
HZ		 217 larb_mmu = &data->smi_imu.larb_imu[larbid];
218
219 dev_dbg(dev, "%s iommu port: %d\n",
220 enable ? "enable" : "disable", portid);
221
222 if (enable)
223 larb_mmu->mmu |= MTK_SMI_MMU_EN(portid);
224 else
225 larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid);
226 }
227}
228
229static int mtk_iommu_domain_finalise(struct mtk_iommu_data *data)
230{
231 struct mtk_iommu_domain *dom = data->m4u_dom;
232
233 spin_lock_init(&dom->pgtlock);
234
750afb08
LC		 235 dom->pgt_va = dma_alloc_coherent(data->dev, M2701_IOMMU_PGT_SIZE,
236 &dom->pgt_pa, GFP_KERNEL);
b17336c5
HZ		 237 if (!dom->pgt_va)
238 return -ENOMEM;
239
240 writel(dom->pgt_pa, data->base + REG_MMU_PT_BASE_ADDR);
241
242 dom->data = data;
243
244 return 0;
245}
246
247static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
248{
249 struct mtk_iommu_domain *dom;
250
251 if (type != IOMMU_DOMAIN_UNMANAGED)
252 return NULL;
253
254 dom = kzalloc(sizeof(*dom), GFP_KERNEL);
255 if (!dom)
256 return NULL;
257
258 return &dom->domain;
259}
260
261static void mtk_iommu_domain_free(struct iommu_domain *domain)
262{
263 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
264 struct mtk_iommu_data *data = dom->data;
265
266 dma_free_coherent(data->dev, M2701_IOMMU_PGT_SIZE,
267 dom->pgt_va, dom->pgt_pa);
268 kfree(to_mtk_domain(domain));
269}
270
271static int mtk_iommu_attach_device(struct iommu_domain *domain,
272 struct device *dev)
273{
274 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
a9bf2eec 275 struct mtk_iommu_data *data = dev_iommu_fwspec_get(dev)->iommu_priv;
b17336c5
HZ		 276 int ret;
277
84672f19 278 if (!data)
b17336c5
HZ		 279 return -ENODEV;
280
b17336c5
HZ		 281 if (!data->m4u_dom) {
282 data->m4u_dom = dom;
283 ret = mtk_iommu_domain_finalise(data);
284 if (ret) {
285 data->m4u_dom = NULL;
286 return ret;
287 }
288 }
289
290 mtk_iommu_config(data, dev, true);
291 return 0;
292}
293
294static void mtk_iommu_detach_device(struct iommu_domain *domain,
295 struct device *dev)
296{
a9bf2eec 297 struct mtk_iommu_data *data = dev_iommu_fwspec_get(dev)->iommu_priv;
b17336c5 298
84672f19 299 if (!data)
b17336c5
HZ		 300 return;
301
b17336c5
HZ		 302 mtk_iommu_config(data, dev, false);
303}
304
305static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,
306 phys_addr_t paddr, size_t size, int prot)
307{
308 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
309 unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT;
310 unsigned long flags;
311 unsigned int i;
312 u32 *pgt_base_iova = dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT);
313 u32 pabase = (u32)paddr;
314 int map_size = 0;
315
316 spin_lock_irqsave(&dom->pgtlock, flags);
317 for (i = 0; i < page_num; i++) {
318 if (pgt_base_iova[i]) {
319 memset(pgt_base_iova, 0, i * sizeof(u32));
320 break;
321 }
322 pgt_base_iova[i] = pabase | F_DESC_VALID | F_DESC_NONSEC;
323 pabase += MT2701_IOMMU_PAGE_SIZE;
324 map_size += MT2701_IOMMU_PAGE_SIZE;
325 }
326
327 spin_unlock_irqrestore(&dom->pgtlock, flags);
328
329 mtk_iommu_tlb_flush_range(dom->data, iova, size);
330
331 return map_size == size ? 0 : -EEXIST;
332}
333
334static size_t mtk_iommu_unmap(struct iommu_domain *domain,
335 unsigned long iova, size_t size)
336{
337 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
338 unsigned long flags;
339 u32 *pgt_base_iova = dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT);
340 unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT;
341
342 spin_lock_irqsave(&dom->pgtlock, flags);
343 memset(pgt_base_iova, 0, page_num * sizeof(u32));
344 spin_unlock_irqrestore(&dom->pgtlock, flags);
345
346 mtk_iommu_tlb_flush_range(dom->data, iova, size);
347
348 return size;
349}
350
351static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
352 dma_addr_t iova)
353{
354 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
355 unsigned long flags;
356 phys_addr_t pa;
357
358 spin_lock_irqsave(&dom->pgtlock, flags);
359 pa = *(dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT));
360 pa = pa & (~(MT2701_IOMMU_PAGE_SIZE - 1));
361 spin_unlock_irqrestore(&dom->pgtlock, flags);
362
363 return pa;
364}
365
b65f5016 366static const struct iommu_ops mtk_iommu_ops;
84672f19 367
b17336c5
HZ		 368/*
369 * MTK generation one iommu HW only support one iommu domain, and all the client
370 * sharing the same iova address space.
371 */
372static int mtk_iommu_create_mapping(struct device *dev,
373 struct of_phandle_args *args)
374{
a9bf2eec 375 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
84672f19 376 struct mtk_iommu_data *data;
b17336c5
HZ		 377 struct platform_device *m4updev;
378 struct dma_iommu_mapping *mtk_mapping;
379 struct device *m4udev;
380 int ret;
381
382 if (args->args_count != 1) {
383 dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n",
384 args->args_count);
385 return -EINVAL;
386 }
387
a9bf2eec 388 if (!fwspec) {
84672f19
RM		 389 ret = iommu_fwspec_init(dev, &args->np->fwnode, &mtk_iommu_ops);
390 if (ret)
391 return ret;
a9bf2eec
JR		 392 fwspec = dev_iommu_fwspec_get(dev);
393 } else if (dev_iommu_fwspec_get(dev)->ops != &mtk_iommu_ops) {
84672f19
RM		 394 return -EINVAL;
395 }
396
a9bf2eec 397 if (!fwspec->iommu_priv) {
b17336c5
HZ		 398 /* Get the m4u device */
399 m4updev = of_find_device_by_node(args->np);
400 if (WARN_ON(!m4updev))
401 return -EINVAL;
402
a9bf2eec 403 fwspec->iommu_priv = platform_get_drvdata(m4updev);
b17336c5
HZ		 404 }
405
84672f19
RM		 406 ret = iommu_fwspec_add_ids(dev, args->args, 1);
407 if (ret)
408 return ret;
b17336c5 409
a9bf2eec 410 data = fwspec->iommu_priv;
84672f19 411 m4udev = data->dev;
b17336c5
HZ		 412 mtk_mapping = m4udev->archdata.iommu;
413 if (!mtk_mapping) {
414 /* MTK iommu support 4GB iova address space. */
415 mtk_mapping = arm_iommu_create_mapping(&platform_bus_type,
416 0, 1ULL << 32);
84672f19
RM		 417 if (IS_ERR(mtk_mapping))
418 return PTR_ERR(mtk_mapping);
419
b17336c5
HZ		 420 m4udev->archdata.iommu = mtk_mapping;
421 }
422
b17336c5 423 return 0;
b17336c5
HZ		 424}
425
426static int mtk_iommu_add_device(struct device *dev)
427{
a9bf2eec 428 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
f3e827d7 429 struct dma_iommu_mapping *mtk_mapping;
b17336c5
HZ		 430 struct of_phandle_args iommu_spec;
431 struct of_phandle_iterator it;
6f66ea09
JR		 432 struct mtk_iommu_data *data;
433 struct iommu_group *group;
b17336c5
HZ		 434 int err;
435
436 of_for_each_phandle(&it, err, dev->of_node, "iommus",
437 "#iommu-cells", 0) {
438 int count = of_phandle_iterator_args(&it, iommu_spec.args,
439 MAX_PHANDLE_ARGS);
440 iommu_spec.np = of_node_get(it.node);
441 iommu_spec.args_count = count;
442
443 mtk_iommu_create_mapping(dev, &iommu_spec);
da5d2748
JR		 444
445 /* dev->iommu_fwspec might have changed */
446 fwspec = dev_iommu_fwspec_get(dev);
447
b17336c5
HZ		 448 of_node_put(iommu_spec.np);
449 }
450
a9bf2eec 451 if (!fwspec || fwspec->ops != &mtk_iommu_ops)
84672f19 452 return -ENODEV; /* Not a iommu client device */
b17336c5 453
f3e827d7
YW		 454 /*
455 * This is a short-term bodge because the ARM DMA code doesn't
456 * understand multi-device groups, but we have to call into it
457 * successfully (and not just rely on a normal IOMMU API attach
458 * here) in order to set the correct DMA API ops on @dev.
459 */
460 group = iommu_group_alloc();
b17336c5
HZ		 461 if (IS_ERR(group))
462 return PTR_ERR(group);
463
f3e827d7 464 err = iommu_group_add_device(group, dev);
b17336c5 465 iommu_group_put(group);
f3e827d7
YW		 466 if (err)
467 return err;
468
a9bf2eec 469 data = fwspec->iommu_priv;
f3e827d7
YW		 470 mtk_mapping = data->dev->archdata.iommu;
471 err = arm_iommu_attach_device(dev, mtk_mapping);
472 if (err) {
473 iommu_group_remove_device(dev);
474 return err;
475 }
476
a947a45f 477 return iommu_device_link(&data->iommu, dev);
b17336c5
HZ		 478}
479
480static void mtk_iommu_remove_device(struct device *dev)
481{
a9bf2eec 482 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
6f66ea09
JR		 483 struct mtk_iommu_data *data;
484
a9bf2eec 485 if (!fwspec || fwspec->ops != &mtk_iommu_ops)
b17336c5
HZ		 486 return;
487
a9bf2eec 488 data = fwspec->iommu_priv;
6f66ea09
JR		 489 iommu_device_unlink(&data->iommu, dev);
490
b17336c5 491 iommu_group_remove_device(dev);
84672f19 492 iommu_fwspec_free(dev);
b17336c5
HZ		 493}
494
b17336c5
HZ		 495static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
496{
497 u32 regval;
498 int ret;
499
500 ret = clk_prepare_enable(data->bclk);
501 if (ret) {
502 dev_err(data->dev, "Failed to enable iommu bclk(%d)\n", ret);
503 return ret;
504 }
505
506 regval = F_MMU_CTRL_COHERENT_EN | F_MMU_TF_PROTECT_SEL(2);
507 writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
508
509 regval = F_INT_TRANSLATION_FAULT |
510 F_INT_MAIN_MULTI_HIT_FAULT |
511 F_INT_INVALID_PA_FAULT |
512 F_INT_ENTRY_REPLACEMENT_FAULT |
513 F_INT_TABLE_WALK_FAULT |
514 F_INT_TLB_MISS_FAULT |
515 F_INT_PFH_DMA_FIFO_OVERFLOW |
516 F_INT_MISS_DMA_FIFO_OVERFLOW;
517 writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL);
518
519 /* protect memory,hw will write here while translation fault */
520 writel_relaxed(data->protect_base,
521 data->base + REG_MMU_IVRP_PADDR);
522
523 writel_relaxed(F_MMU_DCM_ON, data->base + REG_MMU_DCM);
524
525 if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
526 dev_name(data->dev), (void *)data)) {
527 writel_relaxed(0, data->base + REG_MMU_PT_BASE_ADDR);
528 clk_disable_unprepare(data->bclk);
529 dev_err(data->dev, "Failed @ IRQ-%d Request\n", data->irq);
530 return -ENODEV;
531 }
532
533 return 0;
534}
535
b65f5016 536static const struct iommu_ops mtk_iommu_ops = {
b17336c5
HZ		 537 .domain_alloc = mtk_iommu_domain_alloc,
538 .domain_free = mtk_iommu_domain_free,
539 .attach_dev = mtk_iommu_attach_device,
540 .detach_dev = mtk_iommu_detach_device,
541 .map = mtk_iommu_map,
542 .unmap = mtk_iommu_unmap,
b17336c5
HZ		 543 .iova_to_phys = mtk_iommu_iova_to_phys,
544 .add_device = mtk_iommu_add_device,
545 .remove_device = mtk_iommu_remove_device,
b17336c5
HZ		 546 .pgsize_bitmap = ~0UL << MT2701_IOMMU_PAGE_SHIFT,
547};
548
549static const struct of_device_id mtk_iommu_of_ids[] = {
550 { .compatible = "mediatek,mt2701-m4u", },
551 {}
552};
553
554static const struct component_master_ops mtk_iommu_com_ops = {
555 .bind = mtk_iommu_bind,
556 .unbind = mtk_iommu_unbind,
557};
558
559static int mtk_iommu_probe(struct platform_device *pdev)
560{
561 struct mtk_iommu_data *data;
562 struct device *dev = &pdev->dev;
563 struct resource *res;
564 struct component_match *match = NULL;
565 struct of_phandle_args larb_spec;
566 struct of_phandle_iterator it;
567 void *protect;
568 int larb_nr, ret, err;
569
570 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
571 if (!data)
572 return -ENOMEM;
573
574 data->dev = dev;
575
576 /* Protect memory. HW will access here while translation fault.*/
577 protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2,
578 GFP_KERNEL | GFP_DMA);
579 if (!protect)
580 return -ENOMEM;
581 data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN);
582
583 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
584 data->base = devm_ioremap_resource(dev, res);
585 if (IS_ERR(data->base))
586 return PTR_ERR(data->base);
587
588 data->irq = platform_get_irq(pdev, 0);
589 if (data->irq < 0)
590 return data->irq;
591
592 data->bclk = devm_clk_get(dev, "bclk");
593 if (IS_ERR(data->bclk))
594 return PTR_ERR(data->bclk);
595
596 larb_nr = 0;
597 of_for_each_phandle(&it, err, dev->of_node,
598 "mediatek,larbs", NULL, 0) {
599 struct platform_device *plarbdev;
600 int count = of_phandle_iterator_args(&it, larb_spec.args,
601 MAX_PHANDLE_ARGS);
602
603 if (count)
604 continue;
605
606 larb_spec.np = of_node_get(it.node);
607 if (!of_device_is_available(larb_spec.np))
608 continue;
609
610 plarbdev = of_find_device_by_node(larb_spec.np);
b17336c5
HZ		 611 if (!plarbdev) {
612 plarbdev = of_platform_device_create(
613 larb_spec.np, NULL,
614 platform_bus_type.dev_root);
00c7c81f
RK		 615 if (!plarbdev) {
616 of_node_put(larb_spec.np);
b17336c5 617 return -EPROBE_DEFER;
00c7c81f 618 }
b17336c5
HZ		 619 }
620
621 data->smi_imu.larb_imu[larb_nr].dev = &plarbdev->dev;
00c7c81f
RK		 622 component_match_add_release(dev, &match, release_of,
623 compare_of, larb_spec.np);
b17336c5
HZ		 624 larb_nr++;
625 }
626
627 data->smi_imu.larb_nr = larb_nr;
628
629 platform_set_drvdata(pdev, data);
630
631 ret = mtk_iommu_hw_init(data);
632 if (ret)
633 return ret;
634
6f66ea09
JR		 635 ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL,
636 dev_name(&pdev->dev));
637 if (ret)
638 return ret;
639
640 iommu_device_set_ops(&data->iommu, &mtk_iommu_ops);
641
642 ret = iommu_device_register(&data->iommu);
643 if (ret)
644 return ret;
645
b17336c5
HZ		 646 if (!iommu_present(&platform_bus_type))
647 bus_set_iommu(&platform_bus_type, &mtk_iommu_ops);
648
649 return component_master_add_with_match(dev, &mtk_iommu_com_ops, match);
650}
651
652static int mtk_iommu_remove(struct platform_device *pdev)
653{
654 struct mtk_iommu_data *data = platform_get_drvdata(pdev);
655
6f66ea09
JR		 656 iommu_device_sysfs_remove(&data->iommu);
657 iommu_device_unregister(&data->iommu);
658
b17336c5
HZ		 659 if (iommu_present(&platform_bus_type))
660 bus_set_iommu(&platform_bus_type, NULL);
661
662 clk_disable_unprepare(data->bclk);
663 devm_free_irq(&pdev->dev, data->irq, data);
664 component_master_del(&pdev->dev, &mtk_iommu_com_ops);
665 return 0;
666}
667
668static int __maybe_unused mtk_iommu_suspend(struct device *dev)
669{
670 struct mtk_iommu_data *data = dev_get_drvdata(dev);
671 struct mtk_iommu_suspend_reg *reg = &data->reg;
672 void __iomem *base = data->base;
673
674 reg->standard_axi_mode = readl_relaxed(base +
675 REG_MMU_STANDARD_AXI_MODE);
676 reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM);
677 reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG);
678 reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL);
679 return 0;
680}
681
682static int __maybe_unused mtk_iommu_resume(struct device *dev)
683{
684 struct mtk_iommu_data *data = dev_get_drvdata(dev);
685 struct mtk_iommu_suspend_reg *reg = &data->reg;
686 void __iomem *base = data->base;
687
688 writel_relaxed(data->m4u_dom->pgt_pa, base + REG_MMU_PT_BASE_ADDR);
689 writel_relaxed(reg->standard_axi_mode,
690 base + REG_MMU_STANDARD_AXI_MODE);
691 writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM);
692 writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG);
693 writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL);
694 writel_relaxed(data->protect_base, base + REG_MMU_IVRP_PADDR);
695 return 0;
696}
697
131bc8eb 698static const struct dev_pm_ops mtk_iommu_pm_ops = {
b17336c5
HZ		 699 SET_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume)
700};
701
702static struct platform_driver mtk_iommu_driver = {
703 .probe = mtk_iommu_probe,
704 .remove = mtk_iommu_remove,
705 .driver = {
395df08d 706 .name = "mtk-iommu-v1",
b17336c5
HZ		 707 .of_match_table = mtk_iommu_of_ids,
708 .pm = &mtk_iommu_pm_ops,
709 }
710};
711
712static int __init m4u_init(void)
713{
714 return platform_driver_register(&mtk_iommu_driver);
715}
b17336c5 716subsys_initcall(m4u_init);
Linux 6.x block layer and io_uring tree(s)