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57d3f11c | 1 | // SPDX-License-Identifier: GPL-2.0 |
d25a2a16 | 2 | /* |
8128ac3b PG |
3 | * IOMMU API for Renesas VMSA-compatible IPMMU |
4 | * Author: Laurent Pinchart <laurent.pinchart@ideasonboard.com> | |
d25a2a16 | 5 | * |
17fe1618 | 6 | * Copyright (C) 2014-2020 Renesas Electronics Corporation |
d25a2a16 LP |
7 | */ |
8 | ||
dbb70692 | 9 | #include <linux/bitmap.h> |
d25a2a16 LP |
10 | #include <linux/delay.h> |
11 | #include <linux/dma-mapping.h> | |
12 | #include <linux/err.h> | |
13 | #include <linux/export.h> | |
8128ac3b | 14 | #include <linux/init.h> |
d25a2a16 LP |
15 | #include <linux/interrupt.h> |
16 | #include <linux/io.h> | |
aedd11e0 | 17 | #include <linux/iopoll.h> |
b77cf11f | 18 | #include <linux/io-pgtable.h> |
d25a2a16 | 19 | #include <linux/iommu.h> |
275f5053 | 20 | #include <linux/of.h> |
7b2d5961 | 21 | #include <linux/of_platform.h> |
52a8fd24 | 22 | #include <linux/pci.h> |
d25a2a16 LP |
23 | #include <linux/platform_device.h> |
24 | #include <linux/sizes.h> | |
25 | #include <linux/slab.h> | |
58b8e8bf | 26 | #include <linux/sys_soc.h> |
d25a2a16 | 27 | |
3ae47292 | 28 | #if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA) |
d25a2a16 | 29 | #include <asm/dma-iommu.h> |
49c875f0 RM |
30 | #else |
31 | #define arm_iommu_create_mapping(...) NULL | |
32 | #define arm_iommu_attach_device(...) -ENODEV | |
33 | #define arm_iommu_release_mapping(...) do {} while (0) | |
3ae47292 | 34 | #endif |
d25a2a16 | 35 | |
7a62ced8 | 36 | #define IPMMU_CTX_MAX 16U |
da38e9ec GU |
37 | #define IPMMU_CTX_INVALID -1 |
38 | ||
7a62ced8 | 39 | #define IPMMU_UTLB_MAX 64U |
dbb70692 | 40 | |
33f3ac9b MD |
41 | struct ipmmu_features { |
42 | bool use_ns_alias_offset; | |
fd5140e2 | 43 | bool has_cache_leaf_nodes; |
5fd16341 | 44 | unsigned int number_of_contexts; |
b7f3f047 | 45 | unsigned int num_utlbs; |
f5c85891 | 46 | bool setup_imbuscr; |
c295f504 | 47 | bool twobit_imttbcr_sl0; |
2ae86955 | 48 | bool reserved_context; |
3623002f | 49 | bool cache_snoop; |
3dc28d9f YS |
50 | unsigned int ctx_offset_base; |
51 | unsigned int ctx_offset_stride; | |
1289f7f1 | 52 | unsigned int utlb_offset_base; |
33f3ac9b MD |
53 | }; |
54 | ||
d25a2a16 LP |
55 | struct ipmmu_vmsa_device { |
56 | struct device *dev; | |
57 | void __iomem *base; | |
01da21e5 | 58 | struct iommu_device iommu; |
fd5140e2 | 59 | struct ipmmu_vmsa_device *root; |
33f3ac9b | 60 | const struct ipmmu_features *features; |
5fd16341 | 61 | unsigned int num_ctx; |
dbb70692 MD |
62 | spinlock_t lock; /* Protects ctx and domains[] */ |
63 | DECLARE_BITMAP(ctx, IPMMU_CTX_MAX); | |
64 | struct ipmmu_vmsa_domain *domains[IPMMU_CTX_MAX]; | |
da38e9ec | 65 | s8 utlb_ctx[IPMMU_UTLB_MAX]; |
d25a2a16 LP |
66 | |
67 | struct dma_iommu_mapping *mapping; | |
68 | }; | |
69 | ||
70 | struct ipmmu_vmsa_domain { | |
71 | struct ipmmu_vmsa_device *mmu; | |
5914c5fd | 72 | struct iommu_domain io_domain; |
d25a2a16 | 73 | |
f20ed39f LP |
74 | struct io_pgtable_cfg cfg; |
75 | struct io_pgtable_ops *iop; | |
76 | ||
d25a2a16 | 77 | unsigned int context_id; |
46583e8c | 78 | struct mutex mutex; /* Protects mappings */ |
d25a2a16 LP |
79 | }; |
80 | ||
5914c5fd JR |
81 | static struct ipmmu_vmsa_domain *to_vmsa_domain(struct iommu_domain *dom) |
82 | { | |
83 | return container_of(dom, struct ipmmu_vmsa_domain, io_domain); | |
84 | } | |
85 | ||
e4efe4a9 | 86 | static struct ipmmu_vmsa_device *to_ipmmu(struct device *dev) |
0fbc8b04 | 87 | { |
be568d6d | 88 | return dev_iommu_priv_get(dev); |
0fbc8b04 MD |
89 | } |
90 | ||
d25a2a16 LP |
91 | #define TLB_LOOP_TIMEOUT 100 /* 100us */ |
92 | ||
93 | /* ----------------------------------------------------------------------------- | |
94 | * Registers Definition | |
95 | */ | |
96 | ||
275f5053 LP |
97 | #define IM_NS_ALIAS_OFFSET 0x800 |
98 | ||
df9828aa YS |
99 | /* MMU "context" registers */ |
100 | #define IMCTR 0x0000 /* R-Car Gen2/3 */ | |
101 | #define IMCTR_INTEN (1 << 2) /* R-Car Gen2/3 */ | |
102 | #define IMCTR_FLUSH (1 << 1) /* R-Car Gen2/3 */ | |
103 | #define IMCTR_MMUEN (1 << 0) /* R-Car Gen2/3 */ | |
104 | ||
105 | #define IMTTBCR 0x0008 /* R-Car Gen2/3 */ | |
106 | #define IMTTBCR_EAE (1 << 31) /* R-Car Gen2/3 */ | |
3623002f | 107 | #define IMTTBCR_SH0_INNER_SHAREABLE (3 << 12) /* R-Car Gen2 only */ |
3623002f | 108 | #define IMTTBCR_ORGN0_WB_WA (1 << 10) /* R-Car Gen2 only */ |
3623002f | 109 | #define IMTTBCR_IRGN0_WB_WA (1 << 8) /* R-Car Gen2 only */ |
5ca54fdc | 110 | #define IMTTBCR_SL0_TWOBIT_LVL_1 (2 << 6) /* R-Car Gen3 only */ |
df9828aa | 111 | #define IMTTBCR_SL0_LVL_1 (1 << 4) /* R-Car Gen2 only */ |
d25a2a16 | 112 | |
df9828aa YS |
113 | #define IMBUSCR 0x000c /* R-Car Gen2 only */ |
114 | #define IMBUSCR_DVM (1 << 2) /* R-Car Gen2 only */ | |
115 | #define IMBUSCR_BUSSEL_MASK (3 << 0) /* R-Car Gen2 only */ | |
d25a2a16 | 116 | |
df9828aa YS |
117 | #define IMTTLBR0 0x0010 /* R-Car Gen2/3 */ |
118 | #define IMTTUBR0 0x0014 /* R-Car Gen2/3 */ | |
d25a2a16 | 119 | |
df9828aa YS |
120 | #define IMSTR 0x0020 /* R-Car Gen2/3 */ |
121 | #define IMSTR_MHIT (1 << 4) /* R-Car Gen2/3 */ | |
122 | #define IMSTR_ABORT (1 << 2) /* R-Car Gen2/3 */ | |
123 | #define IMSTR_PF (1 << 1) /* R-Car Gen2/3 */ | |
124 | #define IMSTR_TF (1 << 0) /* R-Car Gen2/3 */ | |
d25a2a16 | 125 | |
df9828aa | 126 | #define IMMAIR0 0x0028 /* R-Car Gen2/3 */ |
d25a2a16 | 127 | |
df9828aa YS |
128 | #define IMELAR 0x0030 /* R-Car Gen2/3, IMEAR on R-Car Gen2 */ |
129 | #define IMEUAR 0x0034 /* R-Car Gen3 only */ | |
d25a2a16 | 130 | |
df9828aa | 131 | /* uTLB registers */ |
ddbbddd7 | 132 | #define IMUCTR(n) ((n) < 32 ? IMUCTR0(n) : IMUCTR32(n)) |
df9828aa YS |
133 | #define IMUCTR0(n) (0x0300 + ((n) * 16)) /* R-Car Gen2/3 */ |
134 | #define IMUCTR32(n) (0x0600 + (((n) - 32) * 16)) /* R-Car Gen3 only */ | |
135 | #define IMUCTR_TTSEL_MMU(n) ((n) << 4) /* R-Car Gen2/3 */ | |
136 | #define IMUCTR_FLUSH (1 << 1) /* R-Car Gen2/3 */ | |
137 | #define IMUCTR_MMUEN (1 << 0) /* R-Car Gen2/3 */ | |
d25a2a16 | 138 | |
ddbbddd7 | 139 | #define IMUASID(n) ((n) < 32 ? IMUASID0(n) : IMUASID32(n)) |
df9828aa YS |
140 | #define IMUASID0(n) (0x0308 + ((n) * 16)) /* R-Car Gen2/3 */ |
141 | #define IMUASID32(n) (0x0608 + (((n) - 32) * 16)) /* R-Car Gen3 only */ | |
d25a2a16 | 142 | |
fd5140e2 MD |
143 | /* ----------------------------------------------------------------------------- |
144 | * Root device handling | |
145 | */ | |
146 | ||
147 | static struct platform_driver ipmmu_driver; | |
148 | ||
149 | static bool ipmmu_is_root(struct ipmmu_vmsa_device *mmu) | |
150 | { | |
151 | return mmu->root == mmu; | |
152 | } | |
153 | ||
154 | static int __ipmmu_check_device(struct device *dev, void *data) | |
155 | { | |
156 | struct ipmmu_vmsa_device *mmu = dev_get_drvdata(dev); | |
157 | struct ipmmu_vmsa_device **rootp = data; | |
158 | ||
159 | if (ipmmu_is_root(mmu)) | |
160 | *rootp = mmu; | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static struct ipmmu_vmsa_device *ipmmu_find_root(void) | |
166 | { | |
167 | struct ipmmu_vmsa_device *root = NULL; | |
168 | ||
169 | return driver_for_each_device(&ipmmu_driver.driver, NULL, &root, | |
170 | __ipmmu_check_device) == 0 ? root : NULL; | |
171 | } | |
172 | ||
d25a2a16 LP |
173 | /* ----------------------------------------------------------------------------- |
174 | * Read/Write Access | |
175 | */ | |
176 | ||
177 | static u32 ipmmu_read(struct ipmmu_vmsa_device *mmu, unsigned int offset) | |
178 | { | |
179 | return ioread32(mmu->base + offset); | |
180 | } | |
181 | ||
182 | static void ipmmu_write(struct ipmmu_vmsa_device *mmu, unsigned int offset, | |
183 | u32 data) | |
184 | { | |
185 | iowrite32(data, mmu->base + offset); | |
186 | } | |
187 | ||
16d9454f YS |
188 | static unsigned int ipmmu_ctx_reg(struct ipmmu_vmsa_device *mmu, |
189 | unsigned int context_id, unsigned int reg) | |
190 | { | |
7a62ced8 YS |
191 | unsigned int base = mmu->features->ctx_offset_base; |
192 | ||
193 | if (context_id > 7) | |
194 | base += 0x800 - 8 * 0x40; | |
195 | ||
196 | return base + context_id * mmu->features->ctx_offset_stride + reg; | |
16d9454f YS |
197 | } |
198 | ||
199 | static u32 ipmmu_ctx_read(struct ipmmu_vmsa_device *mmu, | |
200 | unsigned int context_id, unsigned int reg) | |
201 | { | |
202 | return ipmmu_read(mmu, ipmmu_ctx_reg(mmu, context_id, reg)); | |
203 | } | |
204 | ||
205 | static void ipmmu_ctx_write(struct ipmmu_vmsa_device *mmu, | |
206 | unsigned int context_id, unsigned int reg, u32 data) | |
207 | { | |
208 | ipmmu_write(mmu, ipmmu_ctx_reg(mmu, context_id, reg), data); | |
209 | } | |
210 | ||
d574893a MD |
211 | static u32 ipmmu_ctx_read_root(struct ipmmu_vmsa_domain *domain, |
212 | unsigned int reg) | |
d25a2a16 | 213 | { |
16d9454f | 214 | return ipmmu_ctx_read(domain->mmu->root, domain->context_id, reg); |
d25a2a16 LP |
215 | } |
216 | ||
d574893a MD |
217 | static void ipmmu_ctx_write_root(struct ipmmu_vmsa_domain *domain, |
218 | unsigned int reg, u32 data) | |
d25a2a16 | 219 | { |
16d9454f | 220 | ipmmu_ctx_write(domain->mmu->root, domain->context_id, reg, data); |
d25a2a16 LP |
221 | } |
222 | ||
d574893a MD |
223 | static void ipmmu_ctx_write_all(struct ipmmu_vmsa_domain *domain, |
224 | unsigned int reg, u32 data) | |
225 | { | |
226 | if (domain->mmu != domain->mmu->root) | |
16d9454f | 227 | ipmmu_ctx_write(domain->mmu, domain->context_id, reg, data); |
d574893a | 228 | |
16d9454f | 229 | ipmmu_ctx_write(domain->mmu->root, domain->context_id, reg, data); |
d574893a MD |
230 | } |
231 | ||
3667c997 YS |
232 | static u32 ipmmu_utlb_reg(struct ipmmu_vmsa_device *mmu, unsigned int reg) |
233 | { | |
1289f7f1 | 234 | return mmu->features->utlb_offset_base + reg; |
3667c997 YS |
235 | } |
236 | ||
237 | static void ipmmu_imuasid_write(struct ipmmu_vmsa_device *mmu, | |
238 | unsigned int utlb, u32 data) | |
239 | { | |
240 | ipmmu_write(mmu, ipmmu_utlb_reg(mmu, IMUASID(utlb)), data); | |
241 | } | |
d574893a | 242 | |
3667c997 YS |
243 | static void ipmmu_imuctr_write(struct ipmmu_vmsa_device *mmu, |
244 | unsigned int utlb, u32 data) | |
245 | { | |
246 | ipmmu_write(mmu, ipmmu_utlb_reg(mmu, IMUCTR(utlb)), data); | |
d574893a MD |
247 | } |
248 | ||
d25a2a16 LP |
249 | /* ----------------------------------------------------------------------------- |
250 | * TLB and microTLB Management | |
251 | */ | |
252 | ||
253 | /* Wait for any pending TLB invalidations to complete */ | |
254 | static void ipmmu_tlb_sync(struct ipmmu_vmsa_domain *domain) | |
255 | { | |
aedd11e0 | 256 | u32 val; |
d25a2a16 | 257 | |
aedd11e0 GU |
258 | if (read_poll_timeout_atomic(ipmmu_ctx_read_root, val, |
259 | !(val & IMCTR_FLUSH), 1, TLB_LOOP_TIMEOUT, | |
260 | false, domain, IMCTR)) | |
261 | dev_err_ratelimited(domain->mmu->dev, | |
d25a2a16 | 262 | "TLB sync timed out -- MMU may be deadlocked\n"); |
d25a2a16 LP |
263 | } |
264 | ||
265 | static void ipmmu_tlb_invalidate(struct ipmmu_vmsa_domain *domain) | |
266 | { | |
267 | u32 reg; | |
268 | ||
d574893a | 269 | reg = ipmmu_ctx_read_root(domain, IMCTR); |
d25a2a16 | 270 | reg |= IMCTR_FLUSH; |
d574893a | 271 | ipmmu_ctx_write_all(domain, IMCTR, reg); |
d25a2a16 LP |
272 | |
273 | ipmmu_tlb_sync(domain); | |
274 | } | |
275 | ||
276 | /* | |
277 | * Enable MMU translation for the microTLB. | |
278 | */ | |
279 | static void ipmmu_utlb_enable(struct ipmmu_vmsa_domain *domain, | |
192d2045 | 280 | unsigned int utlb) |
d25a2a16 LP |
281 | { |
282 | struct ipmmu_vmsa_device *mmu = domain->mmu; | |
283 | ||
192d2045 LP |
284 | /* |
285 | * TODO: Reference-count the microTLB as several bus masters can be | |
286 | * connected to the same microTLB. | |
287 | */ | |
288 | ||
d25a2a16 | 289 | /* TODO: What should we set the ASID to ? */ |
3667c997 | 290 | ipmmu_imuasid_write(mmu, utlb, 0); |
d25a2a16 | 291 | /* TODO: Do we need to flush the microTLB ? */ |
3667c997 YS |
292 | ipmmu_imuctr_write(mmu, utlb, IMUCTR_TTSEL_MMU(domain->context_id) | |
293 | IMUCTR_FLUSH | IMUCTR_MMUEN); | |
da38e9ec | 294 | mmu->utlb_ctx[utlb] = domain->context_id; |
d25a2a16 LP |
295 | } |
296 | ||
666c9f1e JG |
297 | /* |
298 | * Disable MMU translation for the microTLB. | |
299 | */ | |
300 | static void ipmmu_utlb_disable(struct ipmmu_vmsa_domain *domain, | |
301 | unsigned int utlb) | |
302 | { | |
303 | struct ipmmu_vmsa_device *mmu = domain->mmu; | |
304 | ||
305 | ipmmu_imuctr_write(mmu, utlb, 0); | |
306 | mmu->utlb_ctx[utlb] = IPMMU_CTX_INVALID; | |
307 | } | |
308 | ||
f20ed39f | 309 | static void ipmmu_tlb_flush_all(void *cookie) |
d25a2a16 | 310 | { |
f20ed39f LP |
311 | struct ipmmu_vmsa_domain *domain = cookie; |
312 | ||
313 | ipmmu_tlb_invalidate(domain); | |
314 | } | |
315 | ||
05aed941 WD |
316 | static void ipmmu_tlb_flush(unsigned long iova, size_t size, |
317 | size_t granule, void *cookie) | |
f20ed39f | 318 | { |
05aed941 | 319 | ipmmu_tlb_flush_all(cookie); |
f20ed39f LP |
320 | } |
321 | ||
298f7889 | 322 | static const struct iommu_flush_ops ipmmu_flush_ops = { |
f20ed39f | 323 | .tlb_flush_all = ipmmu_tlb_flush_all, |
05aed941 | 324 | .tlb_flush_walk = ipmmu_tlb_flush, |
f20ed39f LP |
325 | }; |
326 | ||
d25a2a16 LP |
327 | /* ----------------------------------------------------------------------------- |
328 | * Domain/Context Management | |
329 | */ | |
330 | ||
dbb70692 MD |
331 | static int ipmmu_domain_allocate_context(struct ipmmu_vmsa_device *mmu, |
332 | struct ipmmu_vmsa_domain *domain) | |
333 | { | |
334 | unsigned long flags; | |
335 | int ret; | |
336 | ||
337 | spin_lock_irqsave(&mmu->lock, flags); | |
338 | ||
5fd16341 MD |
339 | ret = find_first_zero_bit(mmu->ctx, mmu->num_ctx); |
340 | if (ret != mmu->num_ctx) { | |
dbb70692 MD |
341 | mmu->domains[ret] = domain; |
342 | set_bit(ret, mmu->ctx); | |
5fd16341 MD |
343 | } else |
344 | ret = -EBUSY; | |
dbb70692 MD |
345 | |
346 | spin_unlock_irqrestore(&mmu->lock, flags); | |
347 | ||
348 | return ret; | |
349 | } | |
350 | ||
a175a67d OT |
351 | static void ipmmu_domain_free_context(struct ipmmu_vmsa_device *mmu, |
352 | unsigned int context_id) | |
353 | { | |
354 | unsigned long flags; | |
355 | ||
356 | spin_lock_irqsave(&mmu->lock, flags); | |
357 | ||
358 | clear_bit(context_id, mmu->ctx); | |
359 | mmu->domains[context_id] = NULL; | |
360 | ||
361 | spin_unlock_irqrestore(&mmu->lock, flags); | |
362 | } | |
363 | ||
892db541 | 364 | static void ipmmu_domain_setup_context(struct ipmmu_vmsa_domain *domain) |
d25a2a16 | 365 | { |
f64232ee | 366 | u64 ttbr; |
c295f504 | 367 | u32 tmp; |
a175a67d | 368 | |
d25a2a16 | 369 | /* TTBR0 */ |
d1e5f26f | 370 | ttbr = domain->cfg.arm_lpae_s1_cfg.ttbr; |
d574893a MD |
371 | ipmmu_ctx_write_root(domain, IMTTLBR0, ttbr); |
372 | ipmmu_ctx_write_root(domain, IMTTUBR0, ttbr >> 32); | |
d25a2a16 LP |
373 | |
374 | /* | |
375 | * TTBCR | |
3623002f HNP |
376 | * We use long descriptors and allocate the whole 32-bit VA space to |
377 | * TTBR0. | |
d25a2a16 | 378 | */ |
c295f504 MD |
379 | if (domain->mmu->features->twobit_imttbcr_sl0) |
380 | tmp = IMTTBCR_SL0_TWOBIT_LVL_1; | |
381 | else | |
382 | tmp = IMTTBCR_SL0_LVL_1; | |
383 | ||
3623002f HNP |
384 | if (domain->mmu->features->cache_snoop) |
385 | tmp |= IMTTBCR_SH0_INNER_SHAREABLE | IMTTBCR_ORGN0_WB_WA | | |
386 | IMTTBCR_IRGN0_WB_WA; | |
387 | ||
388 | ipmmu_ctx_write_root(domain, IMTTBCR, IMTTBCR_EAE | tmp); | |
d25a2a16 | 389 | |
f20ed39f | 390 | /* MAIR0 */ |
d574893a | 391 | ipmmu_ctx_write_root(domain, IMMAIR0, |
205577ab | 392 | domain->cfg.arm_lpae_s1_cfg.mair); |
d25a2a16 LP |
393 | |
394 | /* IMBUSCR */ | |
f5c85891 MD |
395 | if (domain->mmu->features->setup_imbuscr) |
396 | ipmmu_ctx_write_root(domain, IMBUSCR, | |
397 | ipmmu_ctx_read_root(domain, IMBUSCR) & | |
398 | ~(IMBUSCR_DVM | IMBUSCR_BUSSEL_MASK)); | |
d25a2a16 LP |
399 | |
400 | /* | |
401 | * IMSTR | |
402 | * Clear all interrupt flags. | |
403 | */ | |
d574893a | 404 | ipmmu_ctx_write_root(domain, IMSTR, ipmmu_ctx_read_root(domain, IMSTR)); |
d25a2a16 LP |
405 | |
406 | /* | |
407 | * IMCTR | |
408 | * Enable the MMU and interrupt generation. The long-descriptor | |
409 | * translation table format doesn't use TEX remapping. Don't enable AF | |
410 | * software management as we have no use for it. Flush the TLB as | |
411 | * required when modifying the context registers. | |
412 | */ | |
d574893a MD |
413 | ipmmu_ctx_write_all(domain, IMCTR, |
414 | IMCTR_INTEN | IMCTR_FLUSH | IMCTR_MMUEN); | |
892db541 GU |
415 | } |
416 | ||
417 | static int ipmmu_domain_init_context(struct ipmmu_vmsa_domain *domain) | |
418 | { | |
419 | int ret; | |
420 | ||
421 | /* | |
422 | * Allocate the page table operations. | |
423 | * | |
424 | * VMSA states in section B3.6.3 "Control of Secure or Non-secure memory | |
425 | * access, Long-descriptor format" that the NStable bit being set in a | |
426 | * table descriptor will result in the NStable and NS bits of all child | |
427 | * entries being ignored and considered as being set. The IPMMU seems | |
428 | * not to comply with this, as it generates a secure access page fault | |
429 | * if any of the NStable and NS bits isn't set when running in | |
430 | * non-secure mode. | |
431 | */ | |
432 | domain->cfg.quirks = IO_PGTABLE_QUIRK_ARM_NS; | |
433 | domain->cfg.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K; | |
434 | domain->cfg.ias = 32; | |
435 | domain->cfg.oas = 40; | |
298f7889 | 436 | domain->cfg.tlb = &ipmmu_flush_ops; |
892db541 GU |
437 | domain->io_domain.geometry.aperture_end = DMA_BIT_MASK(32); |
438 | domain->io_domain.geometry.force_aperture = true; | |
439 | /* | |
440 | * TODO: Add support for coherent walk through CCI with DVM and remove | |
441 | * cache handling. For now, delegate it to the io-pgtable code. | |
442 | */ | |
3430abd6 | 443 | domain->cfg.coherent_walk = false; |
892db541 GU |
444 | domain->cfg.iommu_dev = domain->mmu->root->dev; |
445 | ||
446 | /* | |
447 | * Find an unused context. | |
448 | */ | |
449 | ret = ipmmu_domain_allocate_context(domain->mmu->root, domain); | |
450 | if (ret < 0) | |
451 | return ret; | |
452 | ||
453 | domain->context_id = ret; | |
454 | ||
455 | domain->iop = alloc_io_pgtable_ops(ARM_32_LPAE_S1, &domain->cfg, | |
456 | domain); | |
457 | if (!domain->iop) { | |
458 | ipmmu_domain_free_context(domain->mmu->root, | |
459 | domain->context_id); | |
460 | return -EINVAL; | |
461 | } | |
d25a2a16 | 462 | |
892db541 | 463 | ipmmu_domain_setup_context(domain); |
d25a2a16 LP |
464 | return 0; |
465 | } | |
466 | ||
467 | static void ipmmu_domain_destroy_context(struct ipmmu_vmsa_domain *domain) | |
468 | { | |
e5b78f2e GU |
469 | if (!domain->mmu) |
470 | return; | |
471 | ||
d25a2a16 LP |
472 | /* |
473 | * Disable the context. Flush the TLB as required when modifying the | |
474 | * context registers. | |
475 | * | |
476 | * TODO: Is TLB flush really needed ? | |
477 | */ | |
d574893a | 478 | ipmmu_ctx_write_all(domain, IMCTR, IMCTR_FLUSH); |
d25a2a16 | 479 | ipmmu_tlb_sync(domain); |
fd5140e2 | 480 | ipmmu_domain_free_context(domain->mmu->root, domain->context_id); |
d25a2a16 LP |
481 | } |
482 | ||
483 | /* ----------------------------------------------------------------------------- | |
484 | * Fault Handling | |
485 | */ | |
486 | ||
487 | static irqreturn_t ipmmu_domain_irq(struct ipmmu_vmsa_domain *domain) | |
488 | { | |
489 | const u32 err_mask = IMSTR_MHIT | IMSTR_ABORT | IMSTR_PF | IMSTR_TF; | |
490 | struct ipmmu_vmsa_device *mmu = domain->mmu; | |
82576aa8 | 491 | unsigned long iova; |
d25a2a16 | 492 | u32 status; |
d25a2a16 | 493 | |
d574893a | 494 | status = ipmmu_ctx_read_root(domain, IMSTR); |
d25a2a16 LP |
495 | if (!(status & err_mask)) |
496 | return IRQ_NONE; | |
497 | ||
82576aa8 GU |
498 | iova = ipmmu_ctx_read_root(domain, IMELAR); |
499 | if (IS_ENABLED(CONFIG_64BIT)) | |
500 | iova |= (u64)ipmmu_ctx_read_root(domain, IMEUAR) << 32; | |
d25a2a16 LP |
501 | |
502 | /* | |
503 | * Clear the error status flags. Unlike traditional interrupt flag | |
504 | * registers that must be cleared by writing 1, this status register | |
505 | * seems to require 0. The error address register must be read before, | |
506 | * otherwise its value will be 0. | |
507 | */ | |
d574893a | 508 | ipmmu_ctx_write_root(domain, IMSTR, 0); |
d25a2a16 LP |
509 | |
510 | /* Log fatal errors. */ | |
511 | if (status & IMSTR_MHIT) | |
82576aa8 | 512 | dev_err_ratelimited(mmu->dev, "Multiple TLB hits @0x%lx\n", |
d25a2a16 LP |
513 | iova); |
514 | if (status & IMSTR_ABORT) | |
82576aa8 | 515 | dev_err_ratelimited(mmu->dev, "Page Table Walk Abort @0x%lx\n", |
d25a2a16 LP |
516 | iova); |
517 | ||
518 | if (!(status & (IMSTR_PF | IMSTR_TF))) | |
519 | return IRQ_NONE; | |
520 | ||
521 | /* | |
522 | * Try to handle page faults and translation faults. | |
523 | * | |
524 | * TODO: We need to look up the faulty device based on the I/O VA. Use | |
525 | * the IOMMU device for now. | |
526 | */ | |
5914c5fd | 527 | if (!report_iommu_fault(&domain->io_domain, mmu->dev, iova, 0)) |
d25a2a16 LP |
528 | return IRQ_HANDLED; |
529 | ||
530 | dev_err_ratelimited(mmu->dev, | |
82576aa8 | 531 | "Unhandled fault: status 0x%08x iova 0x%lx\n", |
d25a2a16 LP |
532 | status, iova); |
533 | ||
534 | return IRQ_HANDLED; | |
535 | } | |
536 | ||
537 | static irqreturn_t ipmmu_irq(int irq, void *dev) | |
538 | { | |
539 | struct ipmmu_vmsa_device *mmu = dev; | |
dbb70692 MD |
540 | irqreturn_t status = IRQ_NONE; |
541 | unsigned int i; | |
542 | unsigned long flags; | |
d25a2a16 | 543 | |
dbb70692 MD |
544 | spin_lock_irqsave(&mmu->lock, flags); |
545 | ||
546 | /* | |
547 | * Check interrupts for all active contexts. | |
548 | */ | |
5fd16341 | 549 | for (i = 0; i < mmu->num_ctx; i++) { |
dbb70692 MD |
550 | if (!mmu->domains[i]) |
551 | continue; | |
552 | if (ipmmu_domain_irq(mmu->domains[i]) == IRQ_HANDLED) | |
553 | status = IRQ_HANDLED; | |
554 | } | |
d25a2a16 | 555 | |
dbb70692 | 556 | spin_unlock_irqrestore(&mmu->lock, flags); |
d25a2a16 | 557 | |
dbb70692 | 558 | return status; |
d25a2a16 LP |
559 | } |
560 | ||
d25a2a16 LP |
561 | /* ----------------------------------------------------------------------------- |
562 | * IOMMU Operations | |
563 | */ | |
564 | ||
3529375e | 565 | static struct iommu_domain *ipmmu_domain_alloc_paging(struct device *dev) |
d25a2a16 LP |
566 | { |
567 | struct ipmmu_vmsa_domain *domain; | |
568 | ||
569 | domain = kzalloc(sizeof(*domain), GFP_KERNEL); | |
570 | if (!domain) | |
5914c5fd | 571 | return NULL; |
d25a2a16 | 572 | |
46583e8c | 573 | mutex_init(&domain->mutex); |
d25a2a16 | 574 | |
5914c5fd | 575 | return &domain->io_domain; |
d25a2a16 LP |
576 | } |
577 | ||
5914c5fd | 578 | static void ipmmu_domain_free(struct iommu_domain *io_domain) |
d25a2a16 | 579 | { |
5914c5fd | 580 | struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain); |
d25a2a16 LP |
581 | |
582 | /* | |
583 | * Free the domain resources. We assume that all devices have already | |
584 | * been detached. | |
585 | */ | |
586 | ipmmu_domain_destroy_context(domain); | |
f20ed39f | 587 | free_io_pgtable_ops(domain->iop); |
d25a2a16 LP |
588 | kfree(domain); |
589 | } | |
590 | ||
591 | static int ipmmu_attach_device(struct iommu_domain *io_domain, | |
592 | struct device *dev) | |
593 | { | |
df903655 | 594 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
e4efe4a9 | 595 | struct ipmmu_vmsa_device *mmu = to_ipmmu(dev); |
5914c5fd | 596 | struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain); |
a166d31e | 597 | unsigned int i; |
d25a2a16 LP |
598 | int ret = 0; |
599 | ||
e4efe4a9 | 600 | if (!mmu) { |
d25a2a16 LP |
601 | dev_err(dev, "Cannot attach to IPMMU\n"); |
602 | return -ENXIO; | |
603 | } | |
604 | ||
46583e8c | 605 | mutex_lock(&domain->mutex); |
d25a2a16 LP |
606 | |
607 | if (!domain->mmu) { | |
608 | /* The domain hasn't been used yet, initialize it. */ | |
609 | domain->mmu = mmu; | |
610 | ret = ipmmu_domain_init_context(domain); | |
5fd16341 MD |
611 | if (ret < 0) { |
612 | dev_err(dev, "Unable to initialize IPMMU context\n"); | |
613 | domain->mmu = NULL; | |
614 | } else { | |
615 | dev_info(dev, "Using IPMMU context %u\n", | |
616 | domain->context_id); | |
617 | } | |
d25a2a16 LP |
618 | } else if (domain->mmu != mmu) { |
619 | /* | |
620 | * Something is wrong, we can't attach two devices using | |
621 | * different IOMMUs to the same domain. | |
622 | */ | |
d25a2a16 | 623 | ret = -EINVAL; |
3ae47292 MD |
624 | } else |
625 | dev_info(dev, "Reusing IPMMU context %u\n", domain->context_id); | |
d25a2a16 | 626 | |
46583e8c | 627 | mutex_unlock(&domain->mutex); |
d25a2a16 LP |
628 | |
629 | if (ret < 0) | |
630 | return ret; | |
631 | ||
7b2d5961 MD |
632 | for (i = 0; i < fwspec->num_ids; ++i) |
633 | ipmmu_utlb_enable(domain, fwspec->ids[i]); | |
d25a2a16 LP |
634 | |
635 | return 0; | |
636 | } | |
637 | ||
666c9f1e JG |
638 | static int ipmmu_iommu_identity_attach(struct iommu_domain *identity_domain, |
639 | struct device *dev) | |
640 | { | |
641 | struct iommu_domain *io_domain = iommu_get_domain_for_dev(dev); | |
642 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); | |
643 | struct ipmmu_vmsa_domain *domain; | |
644 | unsigned int i; | |
645 | ||
646 | if (io_domain == identity_domain || !io_domain) | |
647 | return 0; | |
648 | ||
649 | domain = to_vmsa_domain(io_domain); | |
650 | for (i = 0; i < fwspec->num_ids; ++i) | |
651 | ipmmu_utlb_disable(domain, fwspec->ids[i]); | |
652 | ||
653 | /* | |
654 | * TODO: Optimize by disabling the context when no device is attached. | |
655 | */ | |
656 | return 0; | |
657 | } | |
658 | ||
659 | static struct iommu_domain_ops ipmmu_iommu_identity_ops = { | |
660 | .attach_dev = ipmmu_iommu_identity_attach, | |
661 | }; | |
662 | ||
663 | static struct iommu_domain ipmmu_iommu_identity_domain = { | |
664 | .type = IOMMU_DOMAIN_IDENTITY, | |
665 | .ops = &ipmmu_iommu_identity_ops, | |
666 | }; | |
667 | ||
d25a2a16 | 668 | static int ipmmu_map(struct iommu_domain *io_domain, unsigned long iova, |
0a17bbab RM |
669 | phys_addr_t paddr, size_t pgsize, size_t pgcount, |
670 | int prot, gfp_t gfp, size_t *mapped) | |
d25a2a16 | 671 | { |
5914c5fd | 672 | struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain); |
d25a2a16 | 673 | |
0a17bbab RM |
674 | return domain->iop->map_pages(domain->iop, iova, paddr, pgsize, pgcount, |
675 | prot, gfp, mapped); | |
d25a2a16 LP |
676 | } |
677 | ||
678 | static size_t ipmmu_unmap(struct iommu_domain *io_domain, unsigned long iova, | |
0a17bbab RM |
679 | size_t pgsize, size_t pgcount, |
680 | struct iommu_iotlb_gather *gather) | |
d25a2a16 | 681 | { |
5914c5fd | 682 | struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain); |
d25a2a16 | 683 | |
0a17bbab | 684 | return domain->iop->unmap_pages(domain->iop, iova, pgsize, pgcount, gather); |
d25a2a16 LP |
685 | } |
686 | ||
56f8af5e | 687 | static void ipmmu_flush_iotlb_all(struct iommu_domain *io_domain) |
32b12449 RM |
688 | { |
689 | struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain); | |
690 | ||
691 | if (domain->mmu) | |
692 | ipmmu_tlb_flush_all(domain); | |
693 | } | |
694 | ||
56f8af5e WD |
695 | static void ipmmu_iotlb_sync(struct iommu_domain *io_domain, |
696 | struct iommu_iotlb_gather *gather) | |
697 | { | |
698 | ipmmu_flush_iotlb_all(io_domain); | |
699 | } | |
700 | ||
d25a2a16 LP |
701 | static phys_addr_t ipmmu_iova_to_phys(struct iommu_domain *io_domain, |
702 | dma_addr_t iova) | |
703 | { | |
5914c5fd | 704 | struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain); |
d25a2a16 LP |
705 | |
706 | /* TODO: Is locking needed ? */ | |
707 | ||
f20ed39f | 708 | return domain->iop->iova_to_phys(domain->iop, iova); |
d25a2a16 LP |
709 | } |
710 | ||
7b2d5961 MD |
711 | static int ipmmu_init_platform_device(struct device *dev, |
712 | struct of_phandle_args *args) | |
d25a2a16 | 713 | { |
7b2d5961 | 714 | struct platform_device *ipmmu_pdev; |
bb590c90 | 715 | |
7b2d5961 MD |
716 | ipmmu_pdev = of_find_device_by_node(args->np); |
717 | if (!ipmmu_pdev) | |
bb590c90 LP |
718 | return -ENODEV; |
719 | ||
be568d6d | 720 | dev_iommu_priv_set(dev, platform_get_drvdata(ipmmu_pdev)); |
383fef5f | 721 | |
383fef5f | 722 | return 0; |
58b8e8bf MD |
723 | } |
724 | ||
815cdd86 YS |
725 | static const struct soc_device_attribute soc_needs_opt_in[] = { |
726 | { .family = "R-Car Gen3", }, | |
ae684caf | 727 | { .family = "R-Car Gen4", }, |
815cdd86 | 728 | { .family = "RZ/G2", }, |
58b8e8bf MD |
729 | { /* sentinel */ } |
730 | }; | |
731 | ||
815cdd86 YS |
732 | static const struct soc_device_attribute soc_denylist[] = { |
733 | { .soc_id = "r8a774a1", }, | |
815cdd86 YS |
734 | { .soc_id = "r8a7795", .revision = "ES2.*" }, |
735 | { .soc_id = "r8a7796", }, | |
58b8e8bf MD |
736 | { /* sentinel */ } |
737 | }; | |
738 | ||
815cdd86 | 739 | static const char * const devices_allowlist[] = { |
cec0813d YS |
740 | "ee100000.mmc", |
741 | "ee120000.mmc", | |
742 | "ee140000.mmc", | |
743 | "ee160000.mmc" | |
80759649 YS |
744 | }; |
745 | ||
815cdd86 | 746 | static bool ipmmu_device_is_allowed(struct device *dev) |
b7ee92c6 | 747 | { |
80759649 YS |
748 | unsigned int i; |
749 | ||
b7ee92c6 | 750 | /* |
ae684caf | 751 | * R-Car Gen3/4 and RZ/G2 use the allow list to opt-in devices. |
b7ee92c6 YS |
752 | * For Other SoCs, this returns true anyway. |
753 | */ | |
815cdd86 | 754 | if (!soc_device_match(soc_needs_opt_in)) |
b7ee92c6 YS |
755 | return true; |
756 | ||
815cdd86 YS |
757 | /* Check whether this SoC can use the IPMMU correctly or not */ |
758 | if (soc_device_match(soc_denylist)) | |
b7ee92c6 YS |
759 | return false; |
760 | ||
52a8fd24 YS |
761 | /* Check whether this device is a PCI device */ |
762 | if (dev_is_pci(dev)) | |
763 | return true; | |
764 | ||
815cdd86 YS |
765 | /* Check whether this device can work with the IPMMU */ |
766 | for (i = 0; i < ARRAY_SIZE(devices_allowlist); i++) { | |
767 | if (!strcmp(dev_name(dev), devices_allowlist[i])) | |
80759649 YS |
768 | return true; |
769 | } | |
770 | ||
771 | /* Otherwise, do not allow use of IPMMU */ | |
b7ee92c6 YS |
772 | return false; |
773 | } | |
774 | ||
49558da0 MD |
775 | static int ipmmu_of_xlate(struct device *dev, |
776 | struct of_phandle_args *spec) | |
777 | { | |
815cdd86 | 778 | if (!ipmmu_device_is_allowed(dev)) |
58b8e8bf MD |
779 | return -ENODEV; |
780 | ||
7b2d5961 MD |
781 | iommu_fwspec_add_ids(dev, spec->args, 1); |
782 | ||
49558da0 | 783 | /* Initialize once - xlate() will call multiple times */ |
e4efe4a9 | 784 | if (to_ipmmu(dev)) |
49558da0 MD |
785 | return 0; |
786 | ||
7b2d5961 | 787 | return ipmmu_init_platform_device(dev, spec); |
49558da0 MD |
788 | } |
789 | ||
49c875f0 | 790 | static int ipmmu_init_arm_mapping(struct device *dev) |
383fef5f | 791 | { |
e4efe4a9 | 792 | struct ipmmu_vmsa_device *mmu = to_ipmmu(dev); |
383fef5f MD |
793 | int ret; |
794 | ||
d25a2a16 LP |
795 | /* |
796 | * Create the ARM mapping, used by the ARM DMA mapping core to allocate | |
797 | * VAs. This will allocate a corresponding IOMMU domain. | |
798 | * | |
799 | * TODO: | |
800 | * - Create one mapping per context (TLB). | |
801 | * - Make the mapping size configurable ? We currently use a 2GB mapping | |
802 | * at a 1GB offset to ensure that NULL VAs will fault. | |
803 | */ | |
804 | if (!mmu->mapping) { | |
805 | struct dma_iommu_mapping *mapping; | |
806 | ||
807 | mapping = arm_iommu_create_mapping(&platform_bus_type, | |
720b0cef | 808 | SZ_1G, SZ_2G); |
d25a2a16 LP |
809 | if (IS_ERR(mapping)) { |
810 | dev_err(mmu->dev, "failed to create ARM IOMMU mapping\n"); | |
b8f80bff LP |
811 | ret = PTR_ERR(mapping); |
812 | goto error; | |
d25a2a16 LP |
813 | } |
814 | ||
815 | mmu->mapping = mapping; | |
816 | } | |
817 | ||
818 | /* Attach the ARM VA mapping to the device. */ | |
819 | ret = arm_iommu_attach_device(dev, mmu->mapping); | |
820 | if (ret < 0) { | |
821 | dev_err(dev, "Failed to attach device to VA mapping\n"); | |
822 | goto error; | |
823 | } | |
824 | ||
825 | return 0; | |
826 | ||
827 | error: | |
49c875f0 | 828 | if (mmu->mapping) |
383fef5f | 829 | arm_iommu_release_mapping(mmu->mapping); |
a166d31e | 830 | |
d25a2a16 LP |
831 | return ret; |
832 | } | |
833 | ||
6580c8a7 | 834 | static struct iommu_device *ipmmu_probe_device(struct device *dev) |
3ae47292 | 835 | { |
80eaa9f5 | 836 | struct ipmmu_vmsa_device *mmu = to_ipmmu(dev); |
3ae47292 | 837 | |
0fbc8b04 MD |
838 | /* |
839 | * Only let through devices that have been verified in xlate() | |
0fbc8b04 | 840 | */ |
80eaa9f5 | 841 | if (!mmu) |
6580c8a7 | 842 | return ERR_PTR(-ENODEV); |
3ae47292 | 843 | |
6580c8a7 JR |
844 | return &mmu->iommu; |
845 | } | |
846 | ||
847 | static void ipmmu_probe_finalize(struct device *dev) | |
848 | { | |
849 | int ret = 0; | |
850 | ||
851 | if (IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_IOMMU_DMA)) | |
80eaa9f5 | 852 | ret = ipmmu_init_arm_mapping(dev); |
3ae47292 | 853 | |
6580c8a7 JR |
854 | if (ret) |
855 | dev_err(dev, "Can't create IOMMU mapping - DMA-OPS will not work\n"); | |
3ae47292 MD |
856 | } |
857 | ||
6580c8a7 | 858 | static void ipmmu_release_device(struct device *dev) |
3ae47292 | 859 | { |
24dfb197 LB |
860 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
861 | struct ipmmu_vmsa_device *mmu = to_ipmmu(dev); | |
862 | unsigned int i; | |
863 | ||
864 | for (i = 0; i < fwspec->num_ids; ++i) { | |
865 | unsigned int utlb = fwspec->ids[i]; | |
866 | ||
867 | ipmmu_imuctr_write(mmu, utlb, 0); | |
868 | mmu->utlb_ctx[utlb] = IPMMU_CTX_INVALID; | |
869 | } | |
870 | ||
871 | arm_iommu_release_mapping(mmu->mapping); | |
3ae47292 MD |
872 | } |
873 | ||
3ae47292 | 874 | static const struct iommu_ops ipmmu_ops = { |
666c9f1e | 875 | .identity_domain = &ipmmu_iommu_identity_domain, |
3529375e | 876 | .domain_alloc_paging = ipmmu_domain_alloc_paging, |
6580c8a7 JR |
877 | .probe_device = ipmmu_probe_device, |
878 | .release_device = ipmmu_release_device, | |
879 | .probe_finalize = ipmmu_probe_finalize, | |
8f68911e JG |
880 | /* |
881 | * FIXME: The device grouping is a fixed property of the hardware's | |
882 | * ability to isolate and control DMA, it should not depend on kconfig. | |
883 | */ | |
2ba20b5a | 884 | .device_group = IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_IOMMU_DMA) |
8f68911e | 885 | ? generic_device_group : generic_single_device_group, |
3ae47292 | 886 | .pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K, |
49558da0 | 887 | .of_xlate = ipmmu_of_xlate, |
9a630a4b LB |
888 | .default_domain_ops = &(const struct iommu_domain_ops) { |
889 | .attach_dev = ipmmu_attach_device, | |
0a17bbab RM |
890 | .map_pages = ipmmu_map, |
891 | .unmap_pages = ipmmu_unmap, | |
9a630a4b LB |
892 | .flush_iotlb_all = ipmmu_flush_iotlb_all, |
893 | .iotlb_sync = ipmmu_iotlb_sync, | |
894 | .iova_to_phys = ipmmu_iova_to_phys, | |
895 | .free = ipmmu_domain_free, | |
896 | } | |
3ae47292 MD |
897 | }; |
898 | ||
d25a2a16 LP |
899 | /* ----------------------------------------------------------------------------- |
900 | * Probe/remove and init | |
901 | */ | |
902 | ||
903 | static void ipmmu_device_reset(struct ipmmu_vmsa_device *mmu) | |
904 | { | |
905 | unsigned int i; | |
906 | ||
907 | /* Disable all contexts. */ | |
5fd16341 | 908 | for (i = 0; i < mmu->num_ctx; ++i) |
16d9454f | 909 | ipmmu_ctx_write(mmu, i, IMCTR, 0); |
d25a2a16 LP |
910 | } |
911 | ||
33f3ac9b MD |
912 | static const struct ipmmu_features ipmmu_features_default = { |
913 | .use_ns_alias_offset = true, | |
fd5140e2 | 914 | .has_cache_leaf_nodes = false, |
5fd16341 | 915 | .number_of_contexts = 1, /* software only tested with one context */ |
b7f3f047 | 916 | .num_utlbs = 32, |
f5c85891 | 917 | .setup_imbuscr = true, |
c295f504 | 918 | .twobit_imttbcr_sl0 = false, |
2ae86955 | 919 | .reserved_context = false, |
3623002f | 920 | .cache_snoop = true, |
3dc28d9f YS |
921 | .ctx_offset_base = 0, |
922 | .ctx_offset_stride = 0x40, | |
1289f7f1 | 923 | .utlb_offset_base = 0, |
33f3ac9b MD |
924 | }; |
925 | ||
0b8ac140 | 926 | static const struct ipmmu_features ipmmu_features_rcar_gen3 = { |
58b8e8bf MD |
927 | .use_ns_alias_offset = false, |
928 | .has_cache_leaf_nodes = true, | |
929 | .number_of_contexts = 8, | |
b7f3f047 | 930 | .num_utlbs = 48, |
58b8e8bf MD |
931 | .setup_imbuscr = false, |
932 | .twobit_imttbcr_sl0 = true, | |
2ae86955 | 933 | .reserved_context = true, |
3623002f | 934 | .cache_snoop = false, |
3dc28d9f YS |
935 | .ctx_offset_base = 0, |
936 | .ctx_offset_stride = 0x40, | |
1289f7f1 | 937 | .utlb_offset_base = 0, |
58b8e8bf MD |
938 | }; |
939 | ||
ae684caf | 940 | static const struct ipmmu_features ipmmu_features_rcar_gen4 = { |
7a62ced8 YS |
941 | .use_ns_alias_offset = false, |
942 | .has_cache_leaf_nodes = true, | |
943 | .number_of_contexts = 16, | |
944 | .num_utlbs = 64, | |
945 | .setup_imbuscr = false, | |
946 | .twobit_imttbcr_sl0 = true, | |
947 | .reserved_context = true, | |
948 | .cache_snoop = false, | |
949 | .ctx_offset_base = 0x10000, | |
950 | .ctx_offset_stride = 0x1040, | |
951 | .utlb_offset_base = 0x3000, | |
952 | }; | |
953 | ||
33f3ac9b MD |
954 | static const struct of_device_id ipmmu_of_ids[] = { |
955 | { | |
956 | .compatible = "renesas,ipmmu-vmsa", | |
957 | .data = &ipmmu_features_default, | |
60fb0083 FC |
958 | }, { |
959 | .compatible = "renesas,ipmmu-r8a774a1", | |
960 | .data = &ipmmu_features_rcar_gen3, | |
757f26a3 BD |
961 | }, { |
962 | .compatible = "renesas,ipmmu-r8a774b1", | |
963 | .data = &ipmmu_features_rcar_gen3, | |
b6d39cd8 FC |
964 | }, { |
965 | .compatible = "renesas,ipmmu-r8a774c0", | |
966 | .data = &ipmmu_features_rcar_gen3, | |
4b2aa7a6 MCR |
967 | }, { |
968 | .compatible = "renesas,ipmmu-r8a774e1", | |
969 | .data = &ipmmu_features_rcar_gen3, | |
58b8e8bf MD |
970 | }, { |
971 | .compatible = "renesas,ipmmu-r8a7795", | |
0b8ac140 MD |
972 | .data = &ipmmu_features_rcar_gen3, |
973 | }, { | |
974 | .compatible = "renesas,ipmmu-r8a7796", | |
975 | .data = &ipmmu_features_rcar_gen3, | |
17fe1618 YS |
976 | }, { |
977 | .compatible = "renesas,ipmmu-r8a77961", | |
978 | .data = &ipmmu_features_rcar_gen3, | |
98dbffd3 JM |
979 | }, { |
980 | .compatible = "renesas,ipmmu-r8a77965", | |
981 | .data = &ipmmu_features_rcar_gen3, | |
3701c123 SH |
982 | }, { |
983 | .compatible = "renesas,ipmmu-r8a77970", | |
984 | .data = &ipmmu_features_rcar_gen3, | |
1cdeb52e NY |
985 | }, { |
986 | .compatible = "renesas,ipmmu-r8a77980", | |
987 | .data = &ipmmu_features_rcar_gen3, | |
b0c32912 HNP |
988 | }, { |
989 | .compatible = "renesas,ipmmu-r8a77990", | |
990 | .data = &ipmmu_features_rcar_gen3, | |
3701c123 SH |
991 | }, { |
992 | .compatible = "renesas,ipmmu-r8a77995", | |
993 | .data = &ipmmu_features_rcar_gen3, | |
7a62ced8 YS |
994 | }, { |
995 | .compatible = "renesas,ipmmu-r8a779a0", | |
ae684caf YS |
996 | .data = &ipmmu_features_rcar_gen4, |
997 | }, { | |
9f7d09fe | 998 | .compatible = "renesas,rcar-gen4-ipmmu-vmsa", |
ae684caf | 999 | .data = &ipmmu_features_rcar_gen4, |
33f3ac9b MD |
1000 | }, { |
1001 | /* Terminator */ | |
1002 | }, | |
1003 | }; | |
1004 | ||
d25a2a16 LP |
1005 | static int ipmmu_probe(struct platform_device *pdev) |
1006 | { | |
1007 | struct ipmmu_vmsa_device *mmu; | |
1008 | struct resource *res; | |
1009 | int irq; | |
1010 | int ret; | |
1011 | ||
d25a2a16 LP |
1012 | mmu = devm_kzalloc(&pdev->dev, sizeof(*mmu), GFP_KERNEL); |
1013 | if (!mmu) { | |
1014 | dev_err(&pdev->dev, "cannot allocate device data\n"); | |
1015 | return -ENOMEM; | |
1016 | } | |
1017 | ||
1018 | mmu->dev = &pdev->dev; | |
dbb70692 MD |
1019 | spin_lock_init(&mmu->lock); |
1020 | bitmap_zero(mmu->ctx, IPMMU_CTX_MAX); | |
33f3ac9b | 1021 | mmu->features = of_device_get_match_data(&pdev->dev); |
da38e9ec | 1022 | memset(mmu->utlb_ctx, IPMMU_CTX_INVALID, mmu->features->num_utlbs); |
1fdbbfd5 JJ |
1023 | ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40)); |
1024 | if (ret) | |
1025 | return ret; | |
d25a2a16 LP |
1026 | |
1027 | /* Map I/O memory and request IRQ. */ | |
1028 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1029 | mmu->base = devm_ioremap_resource(&pdev->dev, res); | |
1030 | if (IS_ERR(mmu->base)) | |
1031 | return PTR_ERR(mmu->base); | |
1032 | ||
275f5053 LP |
1033 | /* |
1034 | * The IPMMU has two register banks, for secure and non-secure modes. | |
1035 | * The bank mapped at the beginning of the IPMMU address space | |
1036 | * corresponds to the running mode of the CPU. When running in secure | |
1037 | * mode the non-secure register bank is also available at an offset. | |
1038 | * | |
1039 | * Secure mode operation isn't clearly documented and is thus currently | |
1040 | * not implemented in the driver. Furthermore, preliminary tests of | |
1041 | * non-secure operation with the main register bank were not successful. | |
1042 | * Offset the registers base unconditionally to point to the non-secure | |
1043 | * alias space for now. | |
1044 | */ | |
33f3ac9b MD |
1045 | if (mmu->features->use_ns_alias_offset) |
1046 | mmu->base += IM_NS_ALIAS_OFFSET; | |
275f5053 | 1047 | |
b43e0d8a | 1048 | mmu->num_ctx = min(IPMMU_CTX_MAX, mmu->features->number_of_contexts); |
5fd16341 | 1049 | |
fd5140e2 MD |
1050 | /* |
1051 | * Determine if this IPMMU instance is a root device by checking for | |
1052 | * the lack of has_cache_leaf_nodes flag or renesas,ipmmu-main property. | |
1053 | */ | |
1054 | if (!mmu->features->has_cache_leaf_nodes || | |
a6c9e387 | 1055 | !of_property_present(pdev->dev.of_node, "renesas,ipmmu-main")) |
fd5140e2 MD |
1056 | mmu->root = mmu; |
1057 | else | |
1058 | mmu->root = ipmmu_find_root(); | |
d25a2a16 | 1059 | |
fd5140e2 MD |
1060 | /* |
1061 | * Wait until the root device has been registered for sure. | |
1062 | */ | |
1063 | if (!mmu->root) | |
1064 | return -EPROBE_DEFER; | |
1065 | ||
1066 | /* Root devices have mandatory IRQs */ | |
1067 | if (ipmmu_is_root(mmu)) { | |
ec37d4e9 | 1068 | irq = platform_get_irq(pdev, 0); |
565d4542 | 1069 | if (irq < 0) |
fd5140e2 | 1070 | return irq; |
fd5140e2 MD |
1071 | |
1072 | ret = devm_request_irq(&pdev->dev, irq, ipmmu_irq, 0, | |
1073 | dev_name(&pdev->dev), mmu); | |
1074 | if (ret < 0) { | |
1075 | dev_err(&pdev->dev, "failed to request IRQ %d\n", irq); | |
1076 | return ret; | |
1077 | } | |
1078 | ||
1079 | ipmmu_device_reset(mmu); | |
2ae86955 YS |
1080 | |
1081 | if (mmu->features->reserved_context) { | |
1082 | dev_info(&pdev->dev, "IPMMU context 0 is reserved\n"); | |
1083 | set_bit(0, mmu->ctx); | |
1084 | } | |
fd5140e2 | 1085 | } |
d25a2a16 | 1086 | |
cda52fcd MD |
1087 | /* |
1088 | * Register the IPMMU to the IOMMU subsystem in the following cases: | |
1089 | * - R-Car Gen2 IPMMU (all devices registered) | |
1090 | * - R-Car Gen3 IPMMU (leaf devices only - skip root IPMMU-MM device) | |
1091 | */ | |
1092 | if (!mmu->features->has_cache_leaf_nodes || !ipmmu_is_root(mmu)) { | |
1093 | ret = iommu_device_sysfs_add(&mmu->iommu, &pdev->dev, NULL, | |
1094 | dev_name(&pdev->dev)); | |
1095 | if (ret) | |
1096 | return ret; | |
7af9a5fd | 1097 | |
2d471b20 | 1098 | ret = iommu_device_register(&mmu->iommu, &ipmmu_ops, &pdev->dev); |
cda52fcd MD |
1099 | if (ret) |
1100 | return ret; | |
cda52fcd | 1101 | } |
01da21e5 | 1102 | |
d25a2a16 LP |
1103 | /* |
1104 | * We can't create the ARM mapping here as it requires the bus to have | |
1105 | * an IOMMU, which only happens when bus_set_iommu() is called in | |
1106 | * ipmmu_init() after the probe function returns. | |
1107 | */ | |
1108 | ||
d25a2a16 LP |
1109 | platform_set_drvdata(pdev, mmu); |
1110 | ||
1111 | return 0; | |
1112 | } | |
1113 | ||
7471ea50 | 1114 | static void ipmmu_remove(struct platform_device *pdev) |
d25a2a16 LP |
1115 | { |
1116 | struct ipmmu_vmsa_device *mmu = platform_get_drvdata(pdev); | |
1117 | ||
7af9a5fd | 1118 | iommu_device_sysfs_remove(&mmu->iommu); |
01da21e5 MD |
1119 | iommu_device_unregister(&mmu->iommu); |
1120 | ||
d25a2a16 LP |
1121 | arm_iommu_release_mapping(mmu->mapping); |
1122 | ||
1123 | ipmmu_device_reset(mmu); | |
d25a2a16 LP |
1124 | } |
1125 | ||
da38e9ec GU |
1126 | #ifdef CONFIG_PM_SLEEP |
1127 | static int ipmmu_resume_noirq(struct device *dev) | |
1128 | { | |
1129 | struct ipmmu_vmsa_device *mmu = dev_get_drvdata(dev); | |
1130 | unsigned int i; | |
1131 | ||
1132 | /* Reset root MMU and restore contexts */ | |
1133 | if (ipmmu_is_root(mmu)) { | |
1134 | ipmmu_device_reset(mmu); | |
1135 | ||
1136 | for (i = 0; i < mmu->num_ctx; i++) { | |
1137 | if (!mmu->domains[i]) | |
1138 | continue; | |
1139 | ||
1140 | ipmmu_domain_setup_context(mmu->domains[i]); | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | /* Re-enable active micro-TLBs */ | |
1145 | for (i = 0; i < mmu->features->num_utlbs; i++) { | |
1146 | if (mmu->utlb_ctx[i] == IPMMU_CTX_INVALID) | |
1147 | continue; | |
1148 | ||
1149 | ipmmu_utlb_enable(mmu->root->domains[mmu->utlb_ctx[i]], i); | |
1150 | } | |
1151 | ||
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | static const struct dev_pm_ops ipmmu_pm = { | |
1156 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(NULL, ipmmu_resume_noirq) | |
1157 | }; | |
1158 | #define DEV_PM_OPS &ipmmu_pm | |
1159 | #else | |
1160 | #define DEV_PM_OPS NULL | |
1161 | #endif /* CONFIG_PM_SLEEP */ | |
1162 | ||
d25a2a16 LP |
1163 | static struct platform_driver ipmmu_driver = { |
1164 | .driver = { | |
d25a2a16 | 1165 | .name = "ipmmu-vmsa", |
275f5053 | 1166 | .of_match_table = of_match_ptr(ipmmu_of_ids), |
da38e9ec | 1167 | .pm = DEV_PM_OPS, |
d25a2a16 LP |
1168 | }, |
1169 | .probe = ipmmu_probe, | |
7471ea50 | 1170 | .remove_new = ipmmu_remove, |
d25a2a16 | 1171 | }; |
b87d6d7f | 1172 | builtin_platform_driver(ipmmu_driver); |