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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2015-2016 MediaTek Inc.
4 * Author: Yong Wu <yong.wu@mediatek.com>
5 */
6#include <linux/bitfield.h>
7#include <linux/bug.h>
8#include <linux/clk.h>
9#include <linux/component.h>
10#include <linux/device.h>
11#include <linux/dma-direct.h>
12#include <linux/err.h>
13#include <linux/interrupt.h>
14#include <linux/io.h>
15#include <linux/iommu.h>
16#include <linux/iopoll.h>
17#include <linux/io-pgtable.h>
18#include <linux/list.h>
19#include <linux/mfd/syscon.h>
20#include <linux/module.h>
21#include <linux/of_address.h>
22#include <linux/of_irq.h>
23#include <linux/of_platform.h>
24#include <linux/pci.h>
25#include <linux/platform_device.h>
26#include <linux/pm_runtime.h>
27#include <linux/regmap.h>
28#include <linux/slab.h>
29#include <linux/spinlock.h>
30#include <linux/soc/mediatek/infracfg.h>
31#include <asm/barrier.h>
32#include <soc/mediatek/smi.h>
33
34#include <dt-bindings/memory/mtk-memory-port.h>
35
36#define REG_MMU_PT_BASE_ADDR 0x000
37
38#define REG_MMU_INVALIDATE 0x020
39#define F_ALL_INVLD 0x2
40#define F_MMU_INV_RANGE 0x1
41
42#define REG_MMU_INVLD_START_A 0x024
43#define REG_MMU_INVLD_END_A 0x028
44
45#define REG_MMU_INV_SEL_GEN2 0x02c
46#define REG_MMU_INV_SEL_GEN1 0x038
47#define F_INVLD_EN0 BIT(0)
48#define F_INVLD_EN1 BIT(1)
49
50#define REG_MMU_MISC_CTRL 0x048
51#define F_MMU_IN_ORDER_WR_EN_MASK (BIT(1) | BIT(17))
52#define F_MMU_STANDARD_AXI_MODE_MASK (BIT(3) | BIT(19))
53
54#define REG_MMU_DCM_DIS 0x050
55#define F_MMU_DCM BIT(8)
56
57#define REG_MMU_WR_LEN_CTRL 0x054
58#define F_MMU_WR_THROT_DIS_MASK (BIT(5) | BIT(21))
59
60#define REG_MMU_CTRL_REG 0x110
61#define F_MMU_TF_PROT_TO_PROGRAM_ADDR (2 << 4)
62#define F_MMU_PREFETCH_RT_REPLACE_MOD BIT(4)
63#define F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173 (2 << 5)
64
65#define REG_MMU_IVRP_PADDR 0x114
66
67#define REG_MMU_VLD_PA_RNG 0x118
68#define F_MMU_VLD_PA_RNG(EA, SA) (((EA) << 8) | (SA))
69
70#define REG_MMU_INT_CONTROL0 0x120
71#define F_L2_MULIT_HIT_EN BIT(0)
72#define F_TABLE_WALK_FAULT_INT_EN BIT(1)
73#define F_PREETCH_FIFO_OVERFLOW_INT_EN BIT(2)
74#define F_MISS_FIFO_OVERFLOW_INT_EN BIT(3)
75#define F_PREFETCH_FIFO_ERR_INT_EN BIT(5)
76#define F_MISS_FIFO_ERR_INT_EN BIT(6)
77#define F_INT_CLR_BIT BIT(12)
78
79#define REG_MMU_INT_MAIN_CONTROL 0x124
80 /* mmu0 | mmu1 */
81#define F_INT_TRANSLATION_FAULT (BIT(0) | BIT(7))
82#define F_INT_MAIN_MULTI_HIT_FAULT (BIT(1) | BIT(8))
83#define F_INT_INVALID_PA_FAULT (BIT(2) | BIT(9))
84#define F_INT_ENTRY_REPLACEMENT_FAULT (BIT(3) | BIT(10))
85#define F_INT_TLB_MISS_FAULT (BIT(4) | BIT(11))
86#define F_INT_MISS_TRANSACTION_FIFO_FAULT (BIT(5) | BIT(12))
87#define F_INT_PRETETCH_TRANSATION_FIFO_FAULT (BIT(6) | BIT(13))
88
89#define REG_MMU_CPE_DONE 0x12C
90
91#define REG_MMU_FAULT_ST1 0x134
92#define F_REG_MMU0_FAULT_MASK GENMASK(6, 0)
93#define F_REG_MMU1_FAULT_MASK GENMASK(13, 7)
94
95#define REG_MMU0_FAULT_VA 0x13c
96#define F_MMU_INVAL_VA_31_12_MASK GENMASK(31, 12)
97#define F_MMU_INVAL_VA_34_32_MASK GENMASK(11, 9)
98#define F_MMU_INVAL_PA_34_32_MASK GENMASK(8, 6)
99#define F_MMU_FAULT_VA_WRITE_BIT BIT(1)
100#define F_MMU_FAULT_VA_LAYER_BIT BIT(0)
101
102#define REG_MMU0_INVLD_PA 0x140
103#define REG_MMU1_FAULT_VA 0x144
104#define REG_MMU1_INVLD_PA 0x148
105#define REG_MMU0_INT_ID 0x150
106#define REG_MMU1_INT_ID 0x154
107#define F_MMU_INT_ID_COMM_ID(a) (((a) >> 9) & 0x7)
108#define F_MMU_INT_ID_SUB_COMM_ID(a) (((a) >> 7) & 0x3)
109#define F_MMU_INT_ID_COMM_ID_EXT(a) (((a) >> 10) & 0x7)
110#define F_MMU_INT_ID_SUB_COMM_ID_EXT(a) (((a) >> 7) & 0x7)
111/* Macro for 5 bits length port ID field (default) */
112#define F_MMU_INT_ID_LARB_ID(a) (((a) >> 7) & 0x7)
113#define F_MMU_INT_ID_PORT_ID(a) (((a) >> 2) & 0x1f)
114/* Macro for 6 bits length port ID field */
115#define F_MMU_INT_ID_LARB_ID_WID_6(a) (((a) >> 8) & 0x7)
116#define F_MMU_INT_ID_PORT_ID_WID_6(a) (((a) >> 2) & 0x3f)
117
118#define MTK_PROTECT_PA_ALIGN 256
119#define MTK_IOMMU_BANK_SZ 0x1000
120
121#define PERICFG_IOMMU_1 0x714
122
123#define HAS_4GB_MODE BIT(0)
124/* HW will use the EMI clock if there isn't the "bclk". */
125#define HAS_BCLK BIT(1)
126#define HAS_VLD_PA_RNG BIT(2)
127#define RESET_AXI BIT(3)
128#define OUT_ORDER_WR_EN BIT(4)
129#define HAS_SUB_COMM_2BITS BIT(5)
130#define HAS_SUB_COMM_3BITS BIT(6)
131#define WR_THROT_EN BIT(7)
132#define HAS_LEGACY_IVRP_PADDR BIT(8)
133#define IOVA_34_EN BIT(9)
134#define SHARE_PGTABLE BIT(10) /* 2 HW share pgtable */
135#define DCM_DISABLE BIT(11)
136#define STD_AXI_MODE BIT(12) /* For non MM iommu */
137/* 2 bits: iommu type */
138#define MTK_IOMMU_TYPE_MM (0x0 << 13)
139#define MTK_IOMMU_TYPE_INFRA (0x1 << 13)
140#define MTK_IOMMU_TYPE_MASK (0x3 << 13)
141/* PM and clock always on. e.g. infra iommu */
142#define PM_CLK_AO BIT(15)
143#define IFA_IOMMU_PCIE_SUPPORT BIT(16)
144#define PGTABLE_PA_35_EN BIT(17)
145#define TF_PORT_TO_ADDR_MT8173 BIT(18)
146#define INT_ID_PORT_WIDTH_6 BIT(19)
147
148#define MTK_IOMMU_HAS_FLAG_MASK(pdata, _x, mask) \
149 ((((pdata)->flags) & (mask)) == (_x))
150
151#define MTK_IOMMU_HAS_FLAG(pdata, _x) MTK_IOMMU_HAS_FLAG_MASK(pdata, _x, _x)
152#define MTK_IOMMU_IS_TYPE(pdata, _x) MTK_IOMMU_HAS_FLAG_MASK(pdata, _x,\
153 MTK_IOMMU_TYPE_MASK)
154
155#define MTK_INVALID_LARBID MTK_LARB_NR_MAX
156
157#define MTK_LARB_COM_MAX 8
158#define MTK_LARB_SUBCOM_MAX 8
159
160#define MTK_IOMMU_GROUP_MAX 8
161#define MTK_IOMMU_BANK_MAX 5
162
163enum mtk_iommu_plat {
164 M4U_MT2712,
165 M4U_MT6779,
166 M4U_MT6795,
167 M4U_MT8167,
168 M4U_MT8173,
169 M4U_MT8183,
170 M4U_MT8186,
171 M4U_MT8192,
172 M4U_MT8195,
173 M4U_MT8365,
174};
175
176struct mtk_iommu_iova_region {
177 dma_addr_t iova_base;
178 unsigned long long size;
179};
180
181struct mtk_iommu_suspend_reg {
182 u32 misc_ctrl;
183 u32 dcm_dis;
184 u32 ctrl_reg;
185 u32 vld_pa_rng;
186 u32 wr_len_ctrl;
187
188 u32 int_control[MTK_IOMMU_BANK_MAX];
189 u32 int_main_control[MTK_IOMMU_BANK_MAX];
190 u32 ivrp_paddr[MTK_IOMMU_BANK_MAX];
191};
192
193struct mtk_iommu_plat_data {
194 enum mtk_iommu_plat m4u_plat;
195 u32 flags;
196 u32 inv_sel_reg;
197
198 char *pericfg_comp_str;
199 struct list_head *hw_list;
200 unsigned int iova_region_nr;
201 const struct mtk_iommu_iova_region *iova_region;
202
203 u8 banks_num;
204 bool banks_enable[MTK_IOMMU_BANK_MAX];
205 unsigned int banks_portmsk[MTK_IOMMU_BANK_MAX];
206 unsigned char larbid_remap[MTK_LARB_COM_MAX][MTK_LARB_SUBCOM_MAX];
207};
208
209struct mtk_iommu_bank_data {
210 void __iomem *base;
211 int irq;
212 u8 id;
213 struct device *parent_dev;
214 struct mtk_iommu_data *parent_data;
215 spinlock_t tlb_lock; /* lock for tlb range flush */
216 struct mtk_iommu_domain *m4u_dom; /* Each bank has a domain */
217};
218
219struct mtk_iommu_data {
220 struct device *dev;
221 struct clk *bclk;
222 phys_addr_t protect_base; /* protect memory base */
223 struct mtk_iommu_suspend_reg reg;
224 struct iommu_group *m4u_group[MTK_IOMMU_GROUP_MAX];
225 bool enable_4GB;
226
227 struct iommu_device iommu;
228 const struct mtk_iommu_plat_data *plat_data;
229 struct device *smicomm_dev;
230
231 struct mtk_iommu_bank_data *bank;
232 struct regmap *pericfg;
233 struct mutex mutex; /* Protect m4u_group/m4u_dom above */
234
235 /*
236 * In the sharing pgtable case, list data->list to the global list like m4ulist.
237 * In the non-sharing pgtable case, list data->list to the itself hw_list_head.
238 */
239 struct list_head *hw_list;
240 struct list_head hw_list_head;
241 struct list_head list;
242 struct mtk_smi_larb_iommu larb_imu[MTK_LARB_NR_MAX];
243};
244
245struct mtk_iommu_domain {
246 struct io_pgtable_cfg cfg;
247 struct io_pgtable_ops *iop;
248
249 struct mtk_iommu_bank_data *bank;
250 struct iommu_domain domain;
251
252 struct mutex mutex; /* Protect "data" in this structure */
253};
254
255static int mtk_iommu_bind(struct device *dev)
256{
257 struct mtk_iommu_data *data = dev_get_drvdata(dev);
258
259 return component_bind_all(dev, &data->larb_imu);
260}
261
262static void mtk_iommu_unbind(struct device *dev)
263{
264 struct mtk_iommu_data *data = dev_get_drvdata(dev);
265
266 component_unbind_all(dev, &data->larb_imu);
267}
268
269static const struct iommu_ops mtk_iommu_ops;
270
271static int mtk_iommu_hw_init(const struct mtk_iommu_data *data, unsigned int bankid);
272
273#define MTK_IOMMU_TLB_ADDR(iova) ({ \
274 dma_addr_t _addr = iova; \
275 ((lower_32_bits(_addr) & GENMASK(31, 12)) | upper_32_bits(_addr));\
276})
277
278/*
279 * In M4U 4GB mode, the physical address is remapped as below:
280 *
281 * CPU Physical address:
282 * ====================
283 *
284 * 0 1G 2G 3G 4G 5G
285 * |---A---|---B---|---C---|---D---|---E---|
286 * +--I/O--+------------Memory-------------+
287 *
288 * IOMMU output physical address:
289 * =============================
290 *
291 * 4G 5G 6G 7G 8G
292 * |---E---|---B---|---C---|---D---|
293 * +------------Memory-------------+
294 *
295 * The Region 'A'(I/O) can NOT be mapped by M4U; For Region 'B'/'C'/'D', the
296 * bit32 of the CPU physical address always is needed to set, and for Region
297 * 'E', the CPU physical address keep as is.
298 * Additionally, The iommu consumers always use the CPU phyiscal address.
299 */
300#define MTK_IOMMU_4GB_MODE_REMAP_BASE 0x140000000UL
301
302static LIST_HEAD(m4ulist); /* List all the M4U HWs */
303
304#define for_each_m4u(data, head) list_for_each_entry(data, head, list)
305
306static const struct mtk_iommu_iova_region single_domain[] = {
307 {.iova_base = 0, .size = SZ_4G},
308};
309
310static const struct mtk_iommu_iova_region mt8192_multi_dom[] = {
311 { .iova_base = 0x0, .size = SZ_4G}, /* 0 ~ 4G */
312 #if IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT)
313 { .iova_base = SZ_4G, .size = SZ_4G}, /* 4G ~ 8G */
314 { .iova_base = SZ_4G * 2, .size = SZ_4G}, /* 8G ~ 12G */
315 { .iova_base = SZ_4G * 3, .size = SZ_4G}, /* 12G ~ 16G */
316
317 { .iova_base = 0x240000000ULL, .size = 0x4000000}, /* CCU0 */
318 { .iova_base = 0x244000000ULL, .size = 0x4000000}, /* CCU1 */
319 #endif
320};
321
322/* If 2 M4U share a domain(use the same hwlist), Put the corresponding info in first data.*/
323static struct mtk_iommu_data *mtk_iommu_get_frst_data(struct list_head *hwlist)
324{
325 return list_first_entry(hwlist, struct mtk_iommu_data, list);
326}
327
328static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
329{
330 return container_of(dom, struct mtk_iommu_domain, domain);
331}
332
333static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data)
334{
335 /* Tlb flush all always is in bank0. */
336 struct mtk_iommu_bank_data *bank = &data->bank[0];
337 void __iomem *base = bank->base;
338 unsigned long flags;
339
340 spin_lock_irqsave(&bank->tlb_lock, flags);
341 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, base + data->plat_data->inv_sel_reg);
342 writel_relaxed(F_ALL_INVLD, base + REG_MMU_INVALIDATE);
343 wmb(); /* Make sure the tlb flush all done */
344 spin_unlock_irqrestore(&bank->tlb_lock, flags);
345}
346
347static void mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size,
348 struct mtk_iommu_bank_data *bank)
349{
350 struct list_head *head = bank->parent_data->hw_list;
351 struct mtk_iommu_bank_data *curbank;
352 struct mtk_iommu_data *data;
353 bool check_pm_status;
354 unsigned long flags;
355 void __iomem *base;
356 int ret;
357 u32 tmp;
358
359 for_each_m4u(data, head) {
360 /*
361 * To avoid resume the iommu device frequently when the iommu device
362 * is not active, it doesn't always call pm_runtime_get here, then tlb
363 * flush depends on the tlb flush all in the runtime resume.
364 *
365 * There are 2 special cases:
366 *
367 * Case1: The iommu dev doesn't have power domain but has bclk. This case
368 * should also avoid the tlb flush while the dev is not active to mute
369 * the tlb timeout log. like mt8173.
370 *
371 * Case2: The power/clock of infra iommu is always on, and it doesn't
372 * have the device link with the master devices. This case should avoid
373 * the PM status check.
374 */
375 check_pm_status = !MTK_IOMMU_HAS_FLAG(data->plat_data, PM_CLK_AO);
376
377 if (check_pm_status) {
378 if (pm_runtime_get_if_in_use(data->dev) <= 0)
379 continue;
380 }
381
382 curbank = &data->bank[bank->id];
383 base = curbank->base;
384
385 spin_lock_irqsave(&curbank->tlb_lock, flags);
386 writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
387 base + data->plat_data->inv_sel_reg);
388
389 writel_relaxed(MTK_IOMMU_TLB_ADDR(iova), base + REG_MMU_INVLD_START_A);
390 writel_relaxed(MTK_IOMMU_TLB_ADDR(iova + size - 1),
391 base + REG_MMU_INVLD_END_A);
392 writel_relaxed(F_MMU_INV_RANGE, base + REG_MMU_INVALIDATE);
393
394 /* tlb sync */
395 ret = readl_poll_timeout_atomic(base + REG_MMU_CPE_DONE,
396 tmp, tmp != 0, 10, 1000);
397
398 /* Clear the CPE status */
399 writel_relaxed(0, base + REG_MMU_CPE_DONE);
400 spin_unlock_irqrestore(&curbank->tlb_lock, flags);
401
402 if (ret) {
403 dev_warn(data->dev,
404 "Partial TLB flush timed out, falling back to full flush\n");
405 mtk_iommu_tlb_flush_all(data);
406 }
407
408 if (check_pm_status)
409 pm_runtime_put(data->dev);
410 }
411}
412
413static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
414{
415 struct mtk_iommu_bank_data *bank = dev_id;
416 struct mtk_iommu_data *data = bank->parent_data;
417 struct mtk_iommu_domain *dom = bank->m4u_dom;
418 unsigned int fault_larb = MTK_INVALID_LARBID, fault_port = 0, sub_comm = 0;
419 u32 int_state, regval, va34_32, pa34_32;
420 const struct mtk_iommu_plat_data *plat_data = data->plat_data;
421 void __iomem *base = bank->base;
422 u64 fault_iova, fault_pa;
423 bool layer, write;
424
425 /* Read error info from registers */
426 int_state = readl_relaxed(base + REG_MMU_FAULT_ST1);
427 if (int_state & F_REG_MMU0_FAULT_MASK) {
428 regval = readl_relaxed(base + REG_MMU0_INT_ID);
429 fault_iova = readl_relaxed(base + REG_MMU0_FAULT_VA);
430 fault_pa = readl_relaxed(base + REG_MMU0_INVLD_PA);
431 } else {
432 regval = readl_relaxed(base + REG_MMU1_INT_ID);
433 fault_iova = readl_relaxed(base + REG_MMU1_FAULT_VA);
434 fault_pa = readl_relaxed(base + REG_MMU1_INVLD_PA);
435 }
436 layer = fault_iova & F_MMU_FAULT_VA_LAYER_BIT;
437 write = fault_iova & F_MMU_FAULT_VA_WRITE_BIT;
438 if (MTK_IOMMU_HAS_FLAG(plat_data, IOVA_34_EN)) {
439 va34_32 = FIELD_GET(F_MMU_INVAL_VA_34_32_MASK, fault_iova);
440 fault_iova = fault_iova & F_MMU_INVAL_VA_31_12_MASK;
441 fault_iova |= (u64)va34_32 << 32;
442 }
443 pa34_32 = FIELD_GET(F_MMU_INVAL_PA_34_32_MASK, fault_iova);
444 fault_pa |= (u64)pa34_32 << 32;
445
446 if (MTK_IOMMU_IS_TYPE(plat_data, MTK_IOMMU_TYPE_MM)) {
447 if (MTK_IOMMU_HAS_FLAG(plat_data, HAS_SUB_COMM_2BITS)) {
448 fault_larb = F_MMU_INT_ID_COMM_ID(regval);
449 sub_comm = F_MMU_INT_ID_SUB_COMM_ID(regval);
450 fault_port = F_MMU_INT_ID_PORT_ID(regval);
451 } else if (MTK_IOMMU_HAS_FLAG(plat_data, HAS_SUB_COMM_3BITS)) {
452 fault_larb = F_MMU_INT_ID_COMM_ID_EXT(regval);
453 sub_comm = F_MMU_INT_ID_SUB_COMM_ID_EXT(regval);
454 fault_port = F_MMU_INT_ID_PORT_ID(regval);
455 } else if (MTK_IOMMU_HAS_FLAG(plat_data, INT_ID_PORT_WIDTH_6)) {
456 fault_port = F_MMU_INT_ID_PORT_ID_WID_6(regval);
457 fault_larb = F_MMU_INT_ID_LARB_ID_WID_6(regval);
458 } else {
459 fault_port = F_MMU_INT_ID_PORT_ID(regval);
460 fault_larb = F_MMU_INT_ID_LARB_ID(regval);
461 }
462 fault_larb = data->plat_data->larbid_remap[fault_larb][sub_comm];
463 }
464
465 if (!dom || report_iommu_fault(&dom->domain, bank->parent_dev, fault_iova,
466 write ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ)) {
467 dev_err_ratelimited(
468 bank->parent_dev,
469 "fault type=0x%x iova=0x%llx pa=0x%llx master=0x%x(larb=%d port=%d) layer=%d %s\n",
470 int_state, fault_iova, fault_pa, regval, fault_larb, fault_port,
471 layer, write ? "write" : "read");
472 }
473
474 /* Interrupt clear */
475 regval = readl_relaxed(base + REG_MMU_INT_CONTROL0);
476 regval |= F_INT_CLR_BIT;
477 writel_relaxed(regval, base + REG_MMU_INT_CONTROL0);
478
479 mtk_iommu_tlb_flush_all(data);
480
481 return IRQ_HANDLED;
482}
483
484static unsigned int mtk_iommu_get_bank_id(struct device *dev,
485 const struct mtk_iommu_plat_data *plat_data)
486{
487 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
488 unsigned int i, portmsk = 0, bankid = 0;
489
490 if (plat_data->banks_num == 1)
491 return bankid;
492
493 for (i = 0; i < fwspec->num_ids; i++)
494 portmsk |= BIT(MTK_M4U_TO_PORT(fwspec->ids[i]));
495
496 for (i = 0; i < plat_data->banks_num && i < MTK_IOMMU_BANK_MAX; i++) {
497 if (!plat_data->banks_enable[i])
498 continue;
499
500 if (portmsk & plat_data->banks_portmsk[i]) {
501 bankid = i;
502 break;
503 }
504 }
505 return bankid; /* default is 0 */
506}
507
508static int mtk_iommu_get_iova_region_id(struct device *dev,
509 const struct mtk_iommu_plat_data *plat_data)
510{
511 const struct mtk_iommu_iova_region *rgn = plat_data->iova_region;
512 const struct bus_dma_region *dma_rgn = dev->dma_range_map;
513 int i, candidate = -1;
514 dma_addr_t dma_end;
515
516 if (!dma_rgn || plat_data->iova_region_nr == 1)
517 return 0;
518
519 dma_end = dma_rgn->dma_start + dma_rgn->size - 1;
520 for (i = 0; i < plat_data->iova_region_nr; i++, rgn++) {
521 /* Best fit. */
522 if (dma_rgn->dma_start == rgn->iova_base &&
523 dma_end == rgn->iova_base + rgn->size - 1)
524 return i;
525 /* ok if it is inside this region. */
526 if (dma_rgn->dma_start >= rgn->iova_base &&
527 dma_end < rgn->iova_base + rgn->size)
528 candidate = i;
529 }
530
531 if (candidate >= 0)
532 return candidate;
533 dev_err(dev, "Can NOT find the iommu domain id(%pad 0x%llx).\n",
534 &dma_rgn->dma_start, dma_rgn->size);
535 return -EINVAL;
536}
537
538static int mtk_iommu_config(struct mtk_iommu_data *data, struct device *dev,
539 bool enable, unsigned int regionid)
540{
541 struct mtk_smi_larb_iommu *larb_mmu;
542 unsigned int larbid, portid;
543 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
544 const struct mtk_iommu_iova_region *region;
545 u32 peri_mmuen, peri_mmuen_msk;
546 int i, ret = 0;
547
548 for (i = 0; i < fwspec->num_ids; ++i) {
549 larbid = MTK_M4U_TO_LARB(fwspec->ids[i]);
550 portid = MTK_M4U_TO_PORT(fwspec->ids[i]);
551
552 if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM)) {
553 larb_mmu = &data->larb_imu[larbid];
554
555 region = data->plat_data->iova_region + regionid;
556 larb_mmu->bank[portid] = upper_32_bits(region->iova_base);
557
558 dev_dbg(dev, "%s iommu for larb(%s) port %d region %d rgn-bank %d.\n",
559 enable ? "enable" : "disable", dev_name(larb_mmu->dev),
560 portid, regionid, larb_mmu->bank[portid]);
561
562 if (enable)
563 larb_mmu->mmu |= MTK_SMI_MMU_EN(portid);
564 else
565 larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid);
566 } else if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_INFRA)) {
567 peri_mmuen_msk = BIT(portid);
568 /* PCI dev has only one output id, enable the next writing bit for PCIe */
569 if (dev_is_pci(dev))
570 peri_mmuen_msk |= BIT(portid + 1);
571
572 peri_mmuen = enable ? peri_mmuen_msk : 0;
573 ret = regmap_update_bits(data->pericfg, PERICFG_IOMMU_1,
574 peri_mmuen_msk, peri_mmuen);
575 if (ret)
576 dev_err(dev, "%s iommu(%s) inframaster 0x%x fail(%d).\n",
577 enable ? "enable" : "disable",
578 dev_name(data->dev), peri_mmuen_msk, ret);
579 }
580 }
581 return ret;
582}
583
584static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom,
585 struct mtk_iommu_data *data,
586 unsigned int region_id)
587{
588 const struct mtk_iommu_iova_region *region;
589 struct mtk_iommu_domain *m4u_dom;
590
591 /* Always use bank0 in sharing pgtable case */
592 m4u_dom = data->bank[0].m4u_dom;
593 if (m4u_dom) {
594 dom->iop = m4u_dom->iop;
595 dom->cfg = m4u_dom->cfg;
596 dom->domain.pgsize_bitmap = m4u_dom->cfg.pgsize_bitmap;
597 goto update_iova_region;
598 }
599
600 dom->cfg = (struct io_pgtable_cfg) {
601 .quirks = IO_PGTABLE_QUIRK_ARM_NS |
602 IO_PGTABLE_QUIRK_NO_PERMS |
603 IO_PGTABLE_QUIRK_ARM_MTK_EXT,
604 .pgsize_bitmap = mtk_iommu_ops.pgsize_bitmap,
605 .ias = MTK_IOMMU_HAS_FLAG(data->plat_data, IOVA_34_EN) ? 34 : 32,
606 .iommu_dev = data->dev,
607 };
608
609 if (MTK_IOMMU_HAS_FLAG(data->plat_data, PGTABLE_PA_35_EN))
610 dom->cfg.quirks |= IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT;
611
612 if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE))
613 dom->cfg.oas = data->enable_4GB ? 33 : 32;
614 else
615 dom->cfg.oas = 35;
616
617 dom->iop = alloc_io_pgtable_ops(ARM_V7S, &dom->cfg, data);
618 if (!dom->iop) {
619 dev_err(data->dev, "Failed to alloc io pgtable\n");
620 return -ENOMEM;
621 }
622
623 /* Update our support page sizes bitmap */
624 dom->domain.pgsize_bitmap = dom->cfg.pgsize_bitmap;
625
626update_iova_region:
627 /* Update the iova region for this domain */
628 region = data->plat_data->iova_region + region_id;
629 dom->domain.geometry.aperture_start = region->iova_base;
630 dom->domain.geometry.aperture_end = region->iova_base + region->size - 1;
631 dom->domain.geometry.force_aperture = true;
632 return 0;
633}
634
635static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
636{
637 struct mtk_iommu_domain *dom;
638
639 if (type != IOMMU_DOMAIN_DMA && type != IOMMU_DOMAIN_UNMANAGED)
640 return NULL;
641
642 dom = kzalloc(sizeof(*dom), GFP_KERNEL);
643 if (!dom)
644 return NULL;
645 mutex_init(&dom->mutex);
646
647 return &dom->domain;
648}
649
650static void mtk_iommu_domain_free(struct iommu_domain *domain)
651{
652 kfree(to_mtk_domain(domain));
653}
654
655static int mtk_iommu_attach_device(struct iommu_domain *domain,
656 struct device *dev)
657{
658 struct mtk_iommu_data *data = dev_iommu_priv_get(dev), *frstdata;
659 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
660 struct list_head *hw_list = data->hw_list;
661 struct device *m4udev = data->dev;
662 struct mtk_iommu_bank_data *bank;
663 unsigned int bankid;
664 int ret, region_id;
665
666 region_id = mtk_iommu_get_iova_region_id(dev, data->plat_data);
667 if (region_id < 0)
668 return region_id;
669
670 bankid = mtk_iommu_get_bank_id(dev, data->plat_data);
671 mutex_lock(&dom->mutex);
672 if (!dom->bank) {
673 /* Data is in the frstdata in sharing pgtable case. */
674 frstdata = mtk_iommu_get_frst_data(hw_list);
675
676 ret = mtk_iommu_domain_finalise(dom, frstdata, region_id);
677 if (ret) {
678 mutex_unlock(&dom->mutex);
679 return ret;
680 }
681 dom->bank = &data->bank[bankid];
682 }
683 mutex_unlock(&dom->mutex);
684
685 mutex_lock(&data->mutex);
686 bank = &data->bank[bankid];
687 if (!bank->m4u_dom) { /* Initialize the M4U HW for each a BANK */
688 ret = pm_runtime_resume_and_get(m4udev);
689 if (ret < 0) {
690 dev_err(m4udev, "pm get fail(%d) in attach.\n", ret);
691 goto err_unlock;
692 }
693
694 ret = mtk_iommu_hw_init(data, bankid);
695 if (ret) {
696 pm_runtime_put(m4udev);
697 goto err_unlock;
698 }
699 bank->m4u_dom = dom;
700 writel(dom->cfg.arm_v7s_cfg.ttbr, bank->base + REG_MMU_PT_BASE_ADDR);
701
702 pm_runtime_put(m4udev);
703 }
704 mutex_unlock(&data->mutex);
705
706 return mtk_iommu_config(data, dev, true, region_id);
707
708err_unlock:
709 mutex_unlock(&data->mutex);
710 return ret;
711}
712
713static void mtk_iommu_detach_device(struct iommu_domain *domain,
714 struct device *dev)
715{
716 struct mtk_iommu_data *data = dev_iommu_priv_get(dev);
717
718 mtk_iommu_config(data, dev, false, 0);
719}
720
721static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,
722 phys_addr_t paddr, size_t pgsize, size_t pgcount,
723 int prot, gfp_t gfp, size_t *mapped)
724{
725 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
726
727 /* The "4GB mode" M4U physically can not use the lower remap of Dram. */
728 if (dom->bank->parent_data->enable_4GB)
729 paddr |= BIT_ULL(32);
730
731 /* Synchronize with the tlb_lock */
732 return dom->iop->map_pages(dom->iop, iova, paddr, pgsize, pgcount, prot, gfp, mapped);
733}
734
735static size_t mtk_iommu_unmap(struct iommu_domain *domain,
736 unsigned long iova, size_t pgsize, size_t pgcount,
737 struct iommu_iotlb_gather *gather)
738{
739 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
740
741 iommu_iotlb_gather_add_range(gather, iova, pgsize * pgcount);
742 return dom->iop->unmap_pages(dom->iop, iova, pgsize, pgcount, gather);
743}
744
745static void mtk_iommu_flush_iotlb_all(struct iommu_domain *domain)
746{
747 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
748
749 mtk_iommu_tlb_flush_all(dom->bank->parent_data);
750}
751
752static void mtk_iommu_iotlb_sync(struct iommu_domain *domain,
753 struct iommu_iotlb_gather *gather)
754{
755 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
756 size_t length = gather->end - gather->start + 1;
757
758 mtk_iommu_tlb_flush_range_sync(gather->start, length, dom->bank);
759}
760
761static void mtk_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
762 size_t size)
763{
764 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
765
766 mtk_iommu_tlb_flush_range_sync(iova, size, dom->bank);
767}
768
769static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
770 dma_addr_t iova)
771{
772 struct mtk_iommu_domain *dom = to_mtk_domain(domain);
773 phys_addr_t pa;
774
775 pa = dom->iop->iova_to_phys(dom->iop, iova);
776 if (IS_ENABLED(CONFIG_PHYS_ADDR_T_64BIT) &&
777 dom->bank->parent_data->enable_4GB &&
778 pa >= MTK_IOMMU_4GB_MODE_REMAP_BASE)
779 pa &= ~BIT_ULL(32);
780
781 return pa;
782}
783
784static struct iommu_device *mtk_iommu_probe_device(struct device *dev)
785{
786 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
787 struct mtk_iommu_data *data;
788 struct device_link *link;
789 struct device *larbdev;
790 unsigned int larbid, larbidx, i;
791
792 if (!fwspec || fwspec->ops != &mtk_iommu_ops)
793 return ERR_PTR(-ENODEV); /* Not a iommu client device */
794
795 data = dev_iommu_priv_get(dev);
796
797 if (!MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM))
798 return &data->iommu;
799
800 /*
801 * Link the consumer device with the smi-larb device(supplier).
802 * The device that connects with each a larb is a independent HW.
803 * All the ports in each a device should be in the same larbs.
804 */
805 larbid = MTK_M4U_TO_LARB(fwspec->ids[0]);
806 if (larbid >= MTK_LARB_NR_MAX)
807 return ERR_PTR(-EINVAL);
808
809 for (i = 1; i < fwspec->num_ids; i++) {
810 larbidx = MTK_M4U_TO_LARB(fwspec->ids[i]);
811 if (larbid != larbidx) {
812 dev_err(dev, "Can only use one larb. Fail@larb%d-%d.\n",
813 larbid, larbidx);
814 return ERR_PTR(-EINVAL);
815 }
816 }
817 larbdev = data->larb_imu[larbid].dev;
818 if (!larbdev)
819 return ERR_PTR(-EINVAL);
820
821 link = device_link_add(dev, larbdev,
822 DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);
823 if (!link)
824 dev_err(dev, "Unable to link %s\n", dev_name(larbdev));
825 return &data->iommu;
826}
827
828static void mtk_iommu_release_device(struct device *dev)
829{
830 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
831 struct mtk_iommu_data *data;
832 struct device *larbdev;
833 unsigned int larbid;
834
835 data = dev_iommu_priv_get(dev);
836 if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM)) {
837 larbid = MTK_M4U_TO_LARB(fwspec->ids[0]);
838 larbdev = data->larb_imu[larbid].dev;
839 device_link_remove(dev, larbdev);
840 }
841}
842
843static int mtk_iommu_get_group_id(struct device *dev, const struct mtk_iommu_plat_data *plat_data)
844{
845 unsigned int bankid;
846
847 /*
848 * If the bank function is enabled, each bank is a iommu group/domain.
849 * Otherwise, each iova region is a iommu group/domain.
850 */
851 bankid = mtk_iommu_get_bank_id(dev, plat_data);
852 if (bankid)
853 return bankid;
854
855 return mtk_iommu_get_iova_region_id(dev, plat_data);
856}
857
858static struct iommu_group *mtk_iommu_device_group(struct device *dev)
859{
860 struct mtk_iommu_data *c_data = dev_iommu_priv_get(dev), *data;
861 struct list_head *hw_list = c_data->hw_list;
862 struct iommu_group *group;
863 int groupid;
864
865 data = mtk_iommu_get_frst_data(hw_list);
866 if (!data)
867 return ERR_PTR(-ENODEV);
868
869 groupid = mtk_iommu_get_group_id(dev, data->plat_data);
870 if (groupid < 0)
871 return ERR_PTR(groupid);
872
873 mutex_lock(&data->mutex);
874 group = data->m4u_group[groupid];
875 if (!group) {
876 group = iommu_group_alloc();
877 if (!IS_ERR(group))
878 data->m4u_group[groupid] = group;
879 } else {
880 iommu_group_ref_get(group);
881 }
882 mutex_unlock(&data->mutex);
883 return group;
884}
885
886static int mtk_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
887{
888 struct platform_device *m4updev;
889
890 if (args->args_count != 1) {
891 dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n",
892 args->args_count);
893 return -EINVAL;
894 }
895
896 if (!dev_iommu_priv_get(dev)) {
897 /* Get the m4u device */
898 m4updev = of_find_device_by_node(args->np);
899 if (WARN_ON(!m4updev))
900 return -EINVAL;
901
902 dev_iommu_priv_set(dev, platform_get_drvdata(m4updev));
903 }
904
905 return iommu_fwspec_add_ids(dev, args->args, 1);
906}
907
908static void mtk_iommu_get_resv_regions(struct device *dev,
909 struct list_head *head)
910{
911 struct mtk_iommu_data *data = dev_iommu_priv_get(dev);
912 unsigned int regionid = mtk_iommu_get_iova_region_id(dev, data->plat_data), i;
913 const struct mtk_iommu_iova_region *resv, *curdom;
914 struct iommu_resv_region *region;
915 int prot = IOMMU_WRITE | IOMMU_READ;
916
917 if ((int)regionid < 0)
918 return;
919 curdom = data->plat_data->iova_region + regionid;
920 for (i = 0; i < data->plat_data->iova_region_nr; i++) {
921 resv = data->plat_data->iova_region + i;
922
923 /* Only reserve when the region is inside the current domain */
924 if (resv->iova_base <= curdom->iova_base ||
925 resv->iova_base + resv->size >= curdom->iova_base + curdom->size)
926 continue;
927
928 region = iommu_alloc_resv_region(resv->iova_base, resv->size,
929 prot, IOMMU_RESV_RESERVED,
930 GFP_KERNEL);
931 if (!region)
932 return;
933
934 list_add_tail(®ion->list, head);
935 }
936}
937
938static const struct iommu_ops mtk_iommu_ops = {
939 .domain_alloc = mtk_iommu_domain_alloc,
940 .probe_device = mtk_iommu_probe_device,
941 .release_device = mtk_iommu_release_device,
942 .device_group = mtk_iommu_device_group,
943 .of_xlate = mtk_iommu_of_xlate,
944 .get_resv_regions = mtk_iommu_get_resv_regions,
945 .pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
946 .owner = THIS_MODULE,
947 .default_domain_ops = &(const struct iommu_domain_ops) {
948 .attach_dev = mtk_iommu_attach_device,
949 .detach_dev = mtk_iommu_detach_device,
950 .map_pages = mtk_iommu_map,
951 .unmap_pages = mtk_iommu_unmap,
952 .flush_iotlb_all = mtk_iommu_flush_iotlb_all,
953 .iotlb_sync = mtk_iommu_iotlb_sync,
954 .iotlb_sync_map = mtk_iommu_sync_map,
955 .iova_to_phys = mtk_iommu_iova_to_phys,
956 .free = mtk_iommu_domain_free,
957 }
958};
959
960static int mtk_iommu_hw_init(const struct mtk_iommu_data *data, unsigned int bankid)
961{
962 const struct mtk_iommu_bank_data *bankx = &data->bank[bankid];
963 const struct mtk_iommu_bank_data *bank0 = &data->bank[0];
964 u32 regval;
965
966 /*
967 * Global control settings are in bank0. May re-init these global registers
968 * since no sure if there is bank0 consumers.
969 */
970 if (MTK_IOMMU_HAS_FLAG(data->plat_data, TF_PORT_TO_ADDR_MT8173)) {
971 regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
972 F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173;
973 } else {
974 regval = readl_relaxed(bank0->base + REG_MMU_CTRL_REG);
975 regval |= F_MMU_TF_PROT_TO_PROGRAM_ADDR;
976 }
977 writel_relaxed(regval, bank0->base + REG_MMU_CTRL_REG);
978
979 if (data->enable_4GB &&
980 MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_VLD_PA_RNG)) {
981 /*
982 * If 4GB mode is enabled, the validate PA range is from
983 * 0x1_0000_0000 to 0x1_ffff_ffff. here record bit[32:30].
984 */
985 regval = F_MMU_VLD_PA_RNG(7, 4);
986 writel_relaxed(regval, bank0->base + REG_MMU_VLD_PA_RNG);
987 }
988 if (MTK_IOMMU_HAS_FLAG(data->plat_data, DCM_DISABLE))
989 writel_relaxed(F_MMU_DCM, bank0->base + REG_MMU_DCM_DIS);
990 else
991 writel_relaxed(0, bank0->base + REG_MMU_DCM_DIS);
992
993 if (MTK_IOMMU_HAS_FLAG(data->plat_data, WR_THROT_EN)) {
994 /* write command throttling mode */
995 regval = readl_relaxed(bank0->base + REG_MMU_WR_LEN_CTRL);
996 regval &= ~F_MMU_WR_THROT_DIS_MASK;
997 writel_relaxed(regval, bank0->base + REG_MMU_WR_LEN_CTRL);
998 }
999
1000 if (MTK_IOMMU_HAS_FLAG(data->plat_data, RESET_AXI)) {
1001 /* The register is called STANDARD_AXI_MODE in this case */
1002 regval = 0;
1003 } else {
1004 regval = readl_relaxed(bank0->base + REG_MMU_MISC_CTRL);
1005 if (!MTK_IOMMU_HAS_FLAG(data->plat_data, STD_AXI_MODE))
1006 regval &= ~F_MMU_STANDARD_AXI_MODE_MASK;
1007 if (MTK_IOMMU_HAS_FLAG(data->plat_data, OUT_ORDER_WR_EN))
1008 regval &= ~F_MMU_IN_ORDER_WR_EN_MASK;
1009 }
1010 writel_relaxed(regval, bank0->base + REG_MMU_MISC_CTRL);
1011
1012 /* Independent settings for each bank */
1013 regval = F_L2_MULIT_HIT_EN |
1014 F_TABLE_WALK_FAULT_INT_EN |
1015 F_PREETCH_FIFO_OVERFLOW_INT_EN |
1016 F_MISS_FIFO_OVERFLOW_INT_EN |
1017 F_PREFETCH_FIFO_ERR_INT_EN |
1018 F_MISS_FIFO_ERR_INT_EN;
1019 writel_relaxed(regval, bankx->base + REG_MMU_INT_CONTROL0);
1020
1021 regval = F_INT_TRANSLATION_FAULT |
1022 F_INT_MAIN_MULTI_HIT_FAULT |
1023 F_INT_INVALID_PA_FAULT |
1024 F_INT_ENTRY_REPLACEMENT_FAULT |
1025 F_INT_TLB_MISS_FAULT |
1026 F_INT_MISS_TRANSACTION_FIFO_FAULT |
1027 F_INT_PRETETCH_TRANSATION_FIFO_FAULT;
1028 writel_relaxed(regval, bankx->base + REG_MMU_INT_MAIN_CONTROL);
1029
1030 if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_LEGACY_IVRP_PADDR))
1031 regval = (data->protect_base >> 1) | (data->enable_4GB << 31);
1032 else
1033 regval = lower_32_bits(data->protect_base) |
1034 upper_32_bits(data->protect_base);
1035 writel_relaxed(regval, bankx->base + REG_MMU_IVRP_PADDR);
1036
1037 if (devm_request_irq(bankx->parent_dev, bankx->irq, mtk_iommu_isr, 0,
1038 dev_name(bankx->parent_dev), (void *)bankx)) {
1039 writel_relaxed(0, bankx->base + REG_MMU_PT_BASE_ADDR);
1040 dev_err(bankx->parent_dev, "Failed @ IRQ-%d Request\n", bankx->irq);
1041 return -ENODEV;
1042 }
1043
1044 return 0;
1045}
1046
1047static const struct component_master_ops mtk_iommu_com_ops = {
1048 .bind = mtk_iommu_bind,
1049 .unbind = mtk_iommu_unbind,
1050};
1051
1052static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **match,
1053 struct mtk_iommu_data *data)
1054{
1055 struct device_node *larbnode, *frst_avail_smicomm_node = NULL;
1056 struct platform_device *plarbdev, *pcommdev;
1057 struct device_link *link;
1058 int i, larb_nr, ret;
1059
1060 larb_nr = of_count_phandle_with_args(dev->of_node, "mediatek,larbs", NULL);
1061 if (larb_nr < 0)
1062 return larb_nr;
1063 if (larb_nr == 0 || larb_nr > MTK_LARB_NR_MAX)
1064 return -EINVAL;
1065
1066 for (i = 0; i < larb_nr; i++) {
1067 struct device_node *smicomm_node, *smi_subcomm_node;
1068 u32 id;
1069
1070 larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i);
1071 if (!larbnode) {
1072 ret = -EINVAL;
1073 goto err_larbdev_put;
1074 }
1075
1076 if (!of_device_is_available(larbnode)) {
1077 of_node_put(larbnode);
1078 continue;
1079 }
1080
1081 ret = of_property_read_u32(larbnode, "mediatek,larb-id", &id);
1082 if (ret)/* The id is consecutive if there is no this property */
1083 id = i;
1084 if (id >= MTK_LARB_NR_MAX) {
1085 of_node_put(larbnode);
1086 ret = -EINVAL;
1087 goto err_larbdev_put;
1088 }
1089
1090 plarbdev = of_find_device_by_node(larbnode);
1091 of_node_put(larbnode);
1092 if (!plarbdev) {
1093 ret = -ENODEV;
1094 goto err_larbdev_put;
1095 }
1096 if (data->larb_imu[id].dev) {
1097 platform_device_put(plarbdev);
1098 ret = -EEXIST;
1099 goto err_larbdev_put;
1100 }
1101 data->larb_imu[id].dev = &plarbdev->dev;
1102
1103 if (!plarbdev->dev.driver) {
1104 ret = -EPROBE_DEFER;
1105 goto err_larbdev_put;
1106 }
1107
1108 /* Get smi-(sub)-common dev from the last larb. */
1109 smi_subcomm_node = of_parse_phandle(larbnode, "mediatek,smi", 0);
1110 if (!smi_subcomm_node) {
1111 ret = -EINVAL;
1112 goto err_larbdev_put;
1113 }
1114
1115 /*
1116 * It may have two level smi-common. the node is smi-sub-common if it
1117 * has a new mediatek,smi property. otherwise it is smi-commmon.
1118 */
1119 smicomm_node = of_parse_phandle(smi_subcomm_node, "mediatek,smi", 0);
1120 if (smicomm_node)
1121 of_node_put(smi_subcomm_node);
1122 else
1123 smicomm_node = smi_subcomm_node;
1124
1125 /*
1126 * All the larbs that connect to one IOMMU must connect with the same
1127 * smi-common.
1128 */
1129 if (!frst_avail_smicomm_node) {
1130 frst_avail_smicomm_node = smicomm_node;
1131 } else if (frst_avail_smicomm_node != smicomm_node) {
1132 dev_err(dev, "mediatek,smi property is not right @larb%d.", id);
1133 of_node_put(smicomm_node);
1134 ret = -EINVAL;
1135 goto err_larbdev_put;
1136 } else {
1137 of_node_put(smicomm_node);
1138 }
1139
1140 component_match_add(dev, match, component_compare_dev, &plarbdev->dev);
1141 platform_device_put(plarbdev);
1142 }
1143
1144 if (!frst_avail_smicomm_node)
1145 return -EINVAL;
1146
1147 pcommdev = of_find_device_by_node(frst_avail_smicomm_node);
1148 of_node_put(frst_avail_smicomm_node);
1149 if (!pcommdev)
1150 return -ENODEV;
1151 data->smicomm_dev = &pcommdev->dev;
1152
1153 link = device_link_add(data->smicomm_dev, dev,
1154 DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME);
1155 platform_device_put(pcommdev);
1156 if (!link) {
1157 dev_err(dev, "Unable to link %s.\n", dev_name(data->smicomm_dev));
1158 return -EINVAL;
1159 }
1160 return 0;
1161
1162err_larbdev_put:
1163 for (i = MTK_LARB_NR_MAX - 1; i >= 0; i--) {
1164 if (!data->larb_imu[i].dev)
1165 continue;
1166 put_device(data->larb_imu[i].dev);
1167 }
1168 return ret;
1169}
1170
1171static int mtk_iommu_probe(struct platform_device *pdev)
1172{
1173 struct mtk_iommu_data *data;
1174 struct device *dev = &pdev->dev;
1175 struct resource *res;
1176 resource_size_t ioaddr;
1177 struct component_match *match = NULL;
1178 struct regmap *infracfg;
1179 void *protect;
1180 int ret, banks_num, i = 0;
1181 u32 val;
1182 char *p;
1183 struct mtk_iommu_bank_data *bank;
1184 void __iomem *base;
1185
1186 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
1187 if (!data)
1188 return -ENOMEM;
1189 data->dev = dev;
1190 data->plat_data = of_device_get_match_data(dev);
1191
1192 /* Protect memory. HW will access here while translation fault.*/
1193 protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2, GFP_KERNEL);
1194 if (!protect)
1195 return -ENOMEM;
1196 data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN);
1197
1198 if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE)) {
1199 infracfg = syscon_regmap_lookup_by_phandle(dev->of_node, "mediatek,infracfg");
1200 if (IS_ERR(infracfg)) {
1201 /*
1202 * Legacy devicetrees will not specify a phandle to
1203 * mediatek,infracfg: in that case, we use the older
1204 * way to retrieve a syscon to infra.
1205 *
1206 * This is for retrocompatibility purposes only, hence
1207 * no more compatibles shall be added to this.
1208 */
1209 switch (data->plat_data->m4u_plat) {
1210 case M4U_MT2712:
1211 p = "mediatek,mt2712-infracfg";
1212 break;
1213 case M4U_MT8173:
1214 p = "mediatek,mt8173-infracfg";
1215 break;
1216 default:
1217 p = NULL;
1218 }
1219
1220 infracfg = syscon_regmap_lookup_by_compatible(p);
1221 if (IS_ERR(infracfg))
1222 return PTR_ERR(infracfg);
1223 }
1224
1225 ret = regmap_read(infracfg, REG_INFRA_MISC, &val);
1226 if (ret)
1227 return ret;
1228 data->enable_4GB = !!(val & F_DDR_4GB_SUPPORT_EN);
1229 }
1230
1231 banks_num = data->plat_data->banks_num;
1232 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1233 if (!res)
1234 return -EINVAL;
1235 if (resource_size(res) < banks_num * MTK_IOMMU_BANK_SZ) {
1236 dev_err(dev, "banknr %d. res %pR is not enough.\n", banks_num, res);
1237 return -EINVAL;
1238 }
1239 base = devm_ioremap_resource(dev, res);
1240 if (IS_ERR(base))
1241 return PTR_ERR(base);
1242 ioaddr = res->start;
1243
1244 data->bank = devm_kmalloc(dev, banks_num * sizeof(*data->bank), GFP_KERNEL);
1245 if (!data->bank)
1246 return -ENOMEM;
1247
1248 do {
1249 if (!data->plat_data->banks_enable[i])
1250 continue;
1251 bank = &data->bank[i];
1252 bank->id = i;
1253 bank->base = base + i * MTK_IOMMU_BANK_SZ;
1254 bank->m4u_dom = NULL;
1255
1256 bank->irq = platform_get_irq(pdev, i);
1257 if (bank->irq < 0)
1258 return bank->irq;
1259 bank->parent_dev = dev;
1260 bank->parent_data = data;
1261 spin_lock_init(&bank->tlb_lock);
1262 } while (++i < banks_num);
1263
1264 if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_BCLK)) {
1265 data->bclk = devm_clk_get(dev, "bclk");
1266 if (IS_ERR(data->bclk))
1267 return PTR_ERR(data->bclk);
1268 }
1269
1270 pm_runtime_enable(dev);
1271
1272 if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM)) {
1273 ret = mtk_iommu_mm_dts_parse(dev, &match, data);
1274 if (ret) {
1275 dev_err_probe(dev, ret, "mm dts parse fail\n");
1276 goto out_runtime_disable;
1277 }
1278 } else if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_INFRA)) {
1279 p = data->plat_data->pericfg_comp_str;
1280 data->pericfg = syscon_regmap_lookup_by_compatible(p);
1281 if (IS_ERR(data->pericfg)) {
1282 ret = PTR_ERR(data->pericfg);
1283 goto out_runtime_disable;
1284 }
1285 }
1286
1287 platform_set_drvdata(pdev, data);
1288 mutex_init(&data->mutex);
1289
1290 ret = iommu_device_sysfs_add(&data->iommu, dev, NULL,
1291 "mtk-iommu.%pa", &ioaddr);
1292 if (ret)
1293 goto out_link_remove;
1294
1295 ret = iommu_device_register(&data->iommu, &mtk_iommu_ops, dev);
1296 if (ret)
1297 goto out_sysfs_remove;
1298
1299 if (MTK_IOMMU_HAS_FLAG(data->plat_data, SHARE_PGTABLE)) {
1300 list_add_tail(&data->list, data->plat_data->hw_list);
1301 data->hw_list = data->plat_data->hw_list;
1302 } else {
1303 INIT_LIST_HEAD(&data->hw_list_head);
1304 list_add_tail(&data->list, &data->hw_list_head);
1305 data->hw_list = &data->hw_list_head;
1306 }
1307
1308 if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM)) {
1309 ret = component_master_add_with_match(dev, &mtk_iommu_com_ops, match);
1310 if (ret)
1311 goto out_list_del;
1312 }
1313 return ret;
1314
1315out_list_del:
1316 list_del(&data->list);
1317 iommu_device_unregister(&data->iommu);
1318out_sysfs_remove:
1319 iommu_device_sysfs_remove(&data->iommu);
1320out_link_remove:
1321 if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM))
1322 device_link_remove(data->smicomm_dev, dev);
1323out_runtime_disable:
1324 pm_runtime_disable(dev);
1325 return ret;
1326}
1327
1328static int mtk_iommu_remove(struct platform_device *pdev)
1329{
1330 struct mtk_iommu_data *data = platform_get_drvdata(pdev);
1331 struct mtk_iommu_bank_data *bank;
1332 int i;
1333
1334 iommu_device_sysfs_remove(&data->iommu);
1335 iommu_device_unregister(&data->iommu);
1336
1337 list_del(&data->list);
1338
1339 if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM)) {
1340 device_link_remove(data->smicomm_dev, &pdev->dev);
1341 component_master_del(&pdev->dev, &mtk_iommu_com_ops);
1342 }
1343 pm_runtime_disable(&pdev->dev);
1344 for (i = 0; i < data->plat_data->banks_num; i++) {
1345 bank = &data->bank[i];
1346 if (!bank->m4u_dom)
1347 continue;
1348 devm_free_irq(&pdev->dev, bank->irq, bank);
1349 }
1350 return 0;
1351}
1352
1353static int __maybe_unused mtk_iommu_runtime_suspend(struct device *dev)
1354{
1355 struct mtk_iommu_data *data = dev_get_drvdata(dev);
1356 struct mtk_iommu_suspend_reg *reg = &data->reg;
1357 void __iomem *base;
1358 int i = 0;
1359
1360 base = data->bank[i].base;
1361 reg->wr_len_ctrl = readl_relaxed(base + REG_MMU_WR_LEN_CTRL);
1362 reg->misc_ctrl = readl_relaxed(base + REG_MMU_MISC_CTRL);
1363 reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM_DIS);
1364 reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG);
1365 reg->vld_pa_rng = readl_relaxed(base + REG_MMU_VLD_PA_RNG);
1366 do {
1367 if (!data->plat_data->banks_enable[i])
1368 continue;
1369 base = data->bank[i].base;
1370 reg->int_control[i] = readl_relaxed(base + REG_MMU_INT_CONTROL0);
1371 reg->int_main_control[i] = readl_relaxed(base + REG_MMU_INT_MAIN_CONTROL);
1372 reg->ivrp_paddr[i] = readl_relaxed(base + REG_MMU_IVRP_PADDR);
1373 } while (++i < data->plat_data->banks_num);
1374 clk_disable_unprepare(data->bclk);
1375 return 0;
1376}
1377
1378static int __maybe_unused mtk_iommu_runtime_resume(struct device *dev)
1379{
1380 struct mtk_iommu_data *data = dev_get_drvdata(dev);
1381 struct mtk_iommu_suspend_reg *reg = &data->reg;
1382 struct mtk_iommu_domain *m4u_dom;
1383 void __iomem *base;
1384 int ret, i = 0;
1385
1386 ret = clk_prepare_enable(data->bclk);
1387 if (ret) {
1388 dev_err(data->dev, "Failed to enable clk(%d) in resume\n", ret);
1389 return ret;
1390 }
1391
1392 /*
1393 * Uppon first resume, only enable the clk and return, since the values of the
1394 * registers are not yet set.
1395 */
1396 if (!reg->wr_len_ctrl)
1397 return 0;
1398
1399 base = data->bank[i].base;
1400 writel_relaxed(reg->wr_len_ctrl, base + REG_MMU_WR_LEN_CTRL);
1401 writel_relaxed(reg->misc_ctrl, base + REG_MMU_MISC_CTRL);
1402 writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM_DIS);
1403 writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG);
1404 writel_relaxed(reg->vld_pa_rng, base + REG_MMU_VLD_PA_RNG);
1405 do {
1406 m4u_dom = data->bank[i].m4u_dom;
1407 if (!data->plat_data->banks_enable[i] || !m4u_dom)
1408 continue;
1409 base = data->bank[i].base;
1410 writel_relaxed(reg->int_control[i], base + REG_MMU_INT_CONTROL0);
1411 writel_relaxed(reg->int_main_control[i], base + REG_MMU_INT_MAIN_CONTROL);
1412 writel_relaxed(reg->ivrp_paddr[i], base + REG_MMU_IVRP_PADDR);
1413 writel(m4u_dom->cfg.arm_v7s_cfg.ttbr, base + REG_MMU_PT_BASE_ADDR);
1414 } while (++i < data->plat_data->banks_num);
1415
1416 /*
1417 * Users may allocate dma buffer before they call pm_runtime_get,
1418 * in which case it will lack the necessary tlb flush.
1419 * Thus, make sure to update the tlb after each PM resume.
1420 */
1421 mtk_iommu_tlb_flush_all(data);
1422 return 0;
1423}
1424
1425static const struct dev_pm_ops mtk_iommu_pm_ops = {
1426 SET_RUNTIME_PM_OPS(mtk_iommu_runtime_suspend, mtk_iommu_runtime_resume, NULL)
1427 SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1428 pm_runtime_force_resume)
1429};
1430
1431static const struct mtk_iommu_plat_data mt2712_data = {
1432 .m4u_plat = M4U_MT2712,
1433 .flags = HAS_4GB_MODE | HAS_BCLK | HAS_VLD_PA_RNG | SHARE_PGTABLE |
1434 MTK_IOMMU_TYPE_MM,
1435 .hw_list = &m4ulist,
1436 .inv_sel_reg = REG_MMU_INV_SEL_GEN1,
1437 .iova_region = single_domain,
1438 .banks_num = 1,
1439 .banks_enable = {true},
1440 .iova_region_nr = ARRAY_SIZE(single_domain),
1441 .larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}, {6}, {7}},
1442};
1443
1444static const struct mtk_iommu_plat_data mt6779_data = {
1445 .m4u_plat = M4U_MT6779,
1446 .flags = HAS_SUB_COMM_2BITS | OUT_ORDER_WR_EN | WR_THROT_EN |
1447 MTK_IOMMU_TYPE_MM | PGTABLE_PA_35_EN,
1448 .inv_sel_reg = REG_MMU_INV_SEL_GEN2,
1449 .banks_num = 1,
1450 .banks_enable = {true},
1451 .iova_region = single_domain,
1452 .iova_region_nr = ARRAY_SIZE(single_domain),
1453 .larbid_remap = {{0}, {1}, {2}, {3}, {5}, {7, 8}, {10}, {9}},
1454};
1455
1456static const struct mtk_iommu_plat_data mt6795_data = {
1457 .m4u_plat = M4U_MT6795,
1458 .flags = HAS_4GB_MODE | HAS_BCLK | RESET_AXI |
1459 HAS_LEGACY_IVRP_PADDR | MTK_IOMMU_TYPE_MM |
1460 TF_PORT_TO_ADDR_MT8173,
1461 .inv_sel_reg = REG_MMU_INV_SEL_GEN1,
1462 .banks_num = 1,
1463 .banks_enable = {true},
1464 .iova_region = single_domain,
1465 .iova_region_nr = ARRAY_SIZE(single_domain),
1466 .larbid_remap = {{0}, {1}, {2}, {3}, {4}}, /* Linear mapping. */
1467};
1468
1469static const struct mtk_iommu_plat_data mt8167_data = {
1470 .m4u_plat = M4U_MT8167,
1471 .flags = RESET_AXI | HAS_LEGACY_IVRP_PADDR | MTK_IOMMU_TYPE_MM,
1472 .inv_sel_reg = REG_MMU_INV_SEL_GEN1,
1473 .banks_num = 1,
1474 .banks_enable = {true},
1475 .iova_region = single_domain,
1476 .iova_region_nr = ARRAY_SIZE(single_domain),
1477 .larbid_remap = {{0}, {1}, {2}}, /* Linear mapping. */
1478};
1479
1480static const struct mtk_iommu_plat_data mt8173_data = {
1481 .m4u_plat = M4U_MT8173,
1482 .flags = HAS_4GB_MODE | HAS_BCLK | RESET_AXI |
1483 HAS_LEGACY_IVRP_PADDR | MTK_IOMMU_TYPE_MM |
1484 TF_PORT_TO_ADDR_MT8173,
1485 .inv_sel_reg = REG_MMU_INV_SEL_GEN1,
1486 .banks_num = 1,
1487 .banks_enable = {true},
1488 .iova_region = single_domain,
1489 .iova_region_nr = ARRAY_SIZE(single_domain),
1490 .larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}}, /* Linear mapping. */
1491};
1492
1493static const struct mtk_iommu_plat_data mt8183_data = {
1494 .m4u_plat = M4U_MT8183,
1495 .flags = RESET_AXI | MTK_IOMMU_TYPE_MM,
1496 .inv_sel_reg = REG_MMU_INV_SEL_GEN1,
1497 .banks_num = 1,
1498 .banks_enable = {true},
1499 .iova_region = single_domain,
1500 .iova_region_nr = ARRAY_SIZE(single_domain),
1501 .larbid_remap = {{0}, {4}, {5}, {6}, {7}, {2}, {3}, {1}},
1502};
1503
1504static const struct mtk_iommu_plat_data mt8186_data_mm = {
1505 .m4u_plat = M4U_MT8186,
1506 .flags = HAS_BCLK | HAS_SUB_COMM_2BITS | OUT_ORDER_WR_EN |
1507 WR_THROT_EN | IOVA_34_EN | MTK_IOMMU_TYPE_MM,
1508 .larbid_remap = {{0}, {1, MTK_INVALID_LARBID, 8}, {4}, {7}, {2}, {9, 11, 19, 20},
1509 {MTK_INVALID_LARBID, 14, 16},
1510 {MTK_INVALID_LARBID, 13, MTK_INVALID_LARBID, 17}},
1511 .inv_sel_reg = REG_MMU_INV_SEL_GEN2,
1512 .banks_num = 1,
1513 .banks_enable = {true},
1514 .iova_region = mt8192_multi_dom,
1515 .iova_region_nr = ARRAY_SIZE(mt8192_multi_dom),
1516};
1517
1518static const struct mtk_iommu_plat_data mt8192_data = {
1519 .m4u_plat = M4U_MT8192,
1520 .flags = HAS_BCLK | HAS_SUB_COMM_2BITS | OUT_ORDER_WR_EN |
1521 WR_THROT_EN | IOVA_34_EN | MTK_IOMMU_TYPE_MM,
1522 .inv_sel_reg = REG_MMU_INV_SEL_GEN2,
1523 .banks_num = 1,
1524 .banks_enable = {true},
1525 .iova_region = mt8192_multi_dom,
1526 .iova_region_nr = ARRAY_SIZE(mt8192_multi_dom),
1527 .larbid_remap = {{0}, {1}, {4, 5}, {7}, {2}, {9, 11, 19, 20},
1528 {0, 14, 16}, {0, 13, 18, 17}},
1529};
1530
1531static const struct mtk_iommu_plat_data mt8195_data_infra = {
1532 .m4u_plat = M4U_MT8195,
1533 .flags = WR_THROT_EN | DCM_DISABLE | STD_AXI_MODE | PM_CLK_AO |
1534 MTK_IOMMU_TYPE_INFRA | IFA_IOMMU_PCIE_SUPPORT,
1535 .pericfg_comp_str = "mediatek,mt8195-pericfg_ao",
1536 .inv_sel_reg = REG_MMU_INV_SEL_GEN2,
1537 .banks_num = 5,
1538 .banks_enable = {true, false, false, false, true},
1539 .banks_portmsk = {[0] = GENMASK(19, 16), /* PCIe */
1540 [4] = GENMASK(31, 20), /* USB */
1541 },
1542 .iova_region = single_domain,
1543 .iova_region_nr = ARRAY_SIZE(single_domain),
1544};
1545
1546static const struct mtk_iommu_plat_data mt8195_data_vdo = {
1547 .m4u_plat = M4U_MT8195,
1548 .flags = HAS_BCLK | HAS_SUB_COMM_2BITS | OUT_ORDER_WR_EN |
1549 WR_THROT_EN | IOVA_34_EN | SHARE_PGTABLE | MTK_IOMMU_TYPE_MM,
1550 .hw_list = &m4ulist,
1551 .inv_sel_reg = REG_MMU_INV_SEL_GEN2,
1552 .banks_num = 1,
1553 .banks_enable = {true},
1554 .iova_region = mt8192_multi_dom,
1555 .iova_region_nr = ARRAY_SIZE(mt8192_multi_dom),
1556 .larbid_remap = {{2, 0}, {21}, {24}, {7}, {19}, {9, 10, 11},
1557 {13, 17, 15/* 17b */, 25}, {5}},
1558};
1559
1560static const struct mtk_iommu_plat_data mt8195_data_vpp = {
1561 .m4u_plat = M4U_MT8195,
1562 .flags = HAS_BCLK | HAS_SUB_COMM_3BITS | OUT_ORDER_WR_EN |
1563 WR_THROT_EN | IOVA_34_EN | SHARE_PGTABLE | MTK_IOMMU_TYPE_MM,
1564 .hw_list = &m4ulist,
1565 .inv_sel_reg = REG_MMU_INV_SEL_GEN2,
1566 .banks_num = 1,
1567 .banks_enable = {true},
1568 .iova_region = mt8192_multi_dom,
1569 .iova_region_nr = ARRAY_SIZE(mt8192_multi_dom),
1570 .larbid_remap = {{1}, {3},
1571 {22, MTK_INVALID_LARBID, MTK_INVALID_LARBID, MTK_INVALID_LARBID, 23},
1572 {8}, {20}, {12},
1573 /* 16: 16a; 29: 16b; 30: CCUtop0; 31: CCUtop1 */
1574 {14, 16, 29, 26, 30, 31, 18},
1575 {4, MTK_INVALID_LARBID, MTK_INVALID_LARBID, MTK_INVALID_LARBID, 6}},
1576};
1577
1578static const struct mtk_iommu_plat_data mt8365_data = {
1579 .m4u_plat = M4U_MT8365,
1580 .flags = RESET_AXI | INT_ID_PORT_WIDTH_6,
1581 .inv_sel_reg = REG_MMU_INV_SEL_GEN1,
1582 .banks_num = 1,
1583 .banks_enable = {true},
1584 .iova_region = single_domain,
1585 .iova_region_nr = ARRAY_SIZE(single_domain),
1586 .larbid_remap = {{0}, {1}, {2}, {3}, {4}, {5}}, /* Linear mapping. */
1587};
1588
1589static const struct of_device_id mtk_iommu_of_ids[] = {
1590 { .compatible = "mediatek,mt2712-m4u", .data = &mt2712_data},
1591 { .compatible = "mediatek,mt6779-m4u", .data = &mt6779_data},
1592 { .compatible = "mediatek,mt6795-m4u", .data = &mt6795_data},
1593 { .compatible = "mediatek,mt8167-m4u", .data = &mt8167_data},
1594 { .compatible = "mediatek,mt8173-m4u", .data = &mt8173_data},
1595 { .compatible = "mediatek,mt8183-m4u", .data = &mt8183_data},
1596 { .compatible = "mediatek,mt8186-iommu-mm", .data = &mt8186_data_mm}, /* mm: m4u */
1597 { .compatible = "mediatek,mt8192-m4u", .data = &mt8192_data},
1598 { .compatible = "mediatek,mt8195-iommu-infra", .data = &mt8195_data_infra},
1599 { .compatible = "mediatek,mt8195-iommu-vdo", .data = &mt8195_data_vdo},
1600 { .compatible = "mediatek,mt8195-iommu-vpp", .data = &mt8195_data_vpp},
1601 { .compatible = "mediatek,mt8365-m4u", .data = &mt8365_data},
1602 {}
1603};
1604
1605static struct platform_driver mtk_iommu_driver = {
1606 .probe = mtk_iommu_probe,
1607 .remove = mtk_iommu_remove,
1608 .driver = {
1609 .name = "mtk-iommu",
1610 .of_match_table = mtk_iommu_of_ids,
1611 .pm = &mtk_iommu_pm_ops,
1612 }
1613};
1614module_platform_driver(mtk_iommu_driver);
1615
1616MODULE_DESCRIPTION("IOMMU API for MediaTek M4U implementations");
1617MODULE_LICENSE("GPL v2");
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);