Commit | Line | Data |
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c68a2921 DK |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License version 2 as | |
4 | * published by the Free Software Foundation. | |
5 | */ | |
6 | ||
c68a2921 DK |
7 | #include <linux/compiler.h> |
8 | #include <linux/delay.h> | |
9 | #include <linux/device.h> | |
4f0aba67 | 10 | #include <linux/dma-iommu.h> |
461a6946 | 11 | #include <linux/dma-mapping.h> |
c68a2921 DK |
12 | #include <linux/errno.h> |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/iommu.h> | |
16 | #include <linux/jiffies.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/of.h> | |
21 | #include <linux/of_platform.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/spinlock.h> | |
25 | ||
26 | /** MMU register offsets */ | |
27 | #define RK_MMU_DTE_ADDR 0x00 /* Directory table address */ | |
28 | #define RK_MMU_STATUS 0x04 | |
29 | #define RK_MMU_COMMAND 0x08 | |
30 | #define RK_MMU_PAGE_FAULT_ADDR 0x0C /* IOVA of last page fault */ | |
31 | #define RK_MMU_ZAP_ONE_LINE 0x10 /* Shootdown one IOTLB entry */ | |
32 | #define RK_MMU_INT_RAWSTAT 0x14 /* IRQ status ignoring mask */ | |
33 | #define RK_MMU_INT_CLEAR 0x18 /* Acknowledge and re-arm irq */ | |
34 | #define RK_MMU_INT_MASK 0x1C /* IRQ enable */ | |
35 | #define RK_MMU_INT_STATUS 0x20 /* IRQ status after masking */ | |
36 | #define RK_MMU_AUTO_GATING 0x24 | |
37 | ||
38 | #define DTE_ADDR_DUMMY 0xCAFEBABE | |
39 | #define FORCE_RESET_TIMEOUT 100 /* ms */ | |
40 | ||
41 | /* RK_MMU_STATUS fields */ | |
42 | #define RK_MMU_STATUS_PAGING_ENABLED BIT(0) | |
43 | #define RK_MMU_STATUS_PAGE_FAULT_ACTIVE BIT(1) | |
44 | #define RK_MMU_STATUS_STALL_ACTIVE BIT(2) | |
45 | #define RK_MMU_STATUS_IDLE BIT(3) | |
46 | #define RK_MMU_STATUS_REPLAY_BUFFER_EMPTY BIT(4) | |
47 | #define RK_MMU_STATUS_PAGE_FAULT_IS_WRITE BIT(5) | |
48 | #define RK_MMU_STATUS_STALL_NOT_ACTIVE BIT(31) | |
49 | ||
50 | /* RK_MMU_COMMAND command values */ | |
51 | #define RK_MMU_CMD_ENABLE_PAGING 0 /* Enable memory translation */ | |
52 | #define RK_MMU_CMD_DISABLE_PAGING 1 /* Disable memory translation */ | |
53 | #define RK_MMU_CMD_ENABLE_STALL 2 /* Stall paging to allow other cmds */ | |
54 | #define RK_MMU_CMD_DISABLE_STALL 3 /* Stop stall re-enables paging */ | |
55 | #define RK_MMU_CMD_ZAP_CACHE 4 /* Shoot down entire IOTLB */ | |
56 | #define RK_MMU_CMD_PAGE_FAULT_DONE 5 /* Clear page fault */ | |
57 | #define RK_MMU_CMD_FORCE_RESET 6 /* Reset all registers */ | |
58 | ||
59 | /* RK_MMU_INT_* register fields */ | |
60 | #define RK_MMU_IRQ_PAGE_FAULT 0x01 /* page fault */ | |
61 | #define RK_MMU_IRQ_BUS_ERROR 0x02 /* bus read error */ | |
62 | #define RK_MMU_IRQ_MASK (RK_MMU_IRQ_PAGE_FAULT | RK_MMU_IRQ_BUS_ERROR) | |
63 | ||
64 | #define NUM_DT_ENTRIES 1024 | |
65 | #define NUM_PT_ENTRIES 1024 | |
66 | ||
67 | #define SPAGE_ORDER 12 | |
68 | #define SPAGE_SIZE (1 << SPAGE_ORDER) | |
69 | ||
70 | /* | |
71 | * Support mapping any size that fits in one page table: | |
72 | * 4 KiB to 4 MiB | |
73 | */ | |
74 | #define RK_IOMMU_PGSIZE_BITMAP 0x007ff000 | |
75 | ||
76 | #define IOMMU_REG_POLL_COUNT_FAST 1000 | |
77 | ||
78 | struct rk_iommu_domain { | |
79 | struct list_head iommus; | |
4f0aba67 | 80 | struct platform_device *pdev; |
c68a2921 | 81 | u32 *dt; /* page directory table */ |
4f0aba67 | 82 | dma_addr_t dt_dma; |
c68a2921 DK |
83 | spinlock_t iommus_lock; /* lock for iommus list */ |
84 | spinlock_t dt_lock; /* lock for modifying page directory table */ | |
bcd516a3 JR |
85 | |
86 | struct iommu_domain domain; | |
c68a2921 DK |
87 | }; |
88 | ||
89 | struct rk_iommu { | |
90 | struct device *dev; | |
cd6438c5 Z |
91 | void __iomem **bases; |
92 | int num_mmu; | |
03f732f8 SX |
93 | int *irq; |
94 | int num_irq; | |
c3aa4742 | 95 | bool reset_disabled; |
c9d9f239 | 96 | struct iommu_device iommu; |
c68a2921 DK |
97 | struct list_head node; /* entry in rk_iommu_domain.iommus */ |
98 | struct iommu_domain *domain; /* domain to which iommu is attached */ | |
99 | }; | |
100 | ||
4f0aba67 SZ |
101 | static inline void rk_table_flush(struct rk_iommu_domain *dom, dma_addr_t dma, |
102 | unsigned int count) | |
c68a2921 | 103 | { |
4f0aba67 | 104 | size_t size = count * sizeof(u32); /* count of u32 entry */ |
c68a2921 | 105 | |
4f0aba67 | 106 | dma_sync_single_for_device(&dom->pdev->dev, dma, size, DMA_TO_DEVICE); |
c68a2921 DK |
107 | } |
108 | ||
bcd516a3 JR |
109 | static struct rk_iommu_domain *to_rk_domain(struct iommu_domain *dom) |
110 | { | |
111 | return container_of(dom, struct rk_iommu_domain, domain); | |
112 | } | |
113 | ||
c68a2921 DK |
114 | /** |
115 | * Inspired by _wait_for in intel_drv.h | |
116 | * This is NOT safe for use in interrupt context. | |
117 | * | |
118 | * Note that it's important that we check the condition again after having | |
119 | * timed out, since the timeout could be due to preemption or similar and | |
120 | * we've never had a chance to check the condition before the timeout. | |
121 | */ | |
122 | #define rk_wait_for(COND, MS) ({ \ | |
123 | unsigned long timeout__ = jiffies + msecs_to_jiffies(MS) + 1; \ | |
124 | int ret__ = 0; \ | |
125 | while (!(COND)) { \ | |
126 | if (time_after(jiffies, timeout__)) { \ | |
127 | ret__ = (COND) ? 0 : -ETIMEDOUT; \ | |
128 | break; \ | |
129 | } \ | |
130 | usleep_range(50, 100); \ | |
131 | } \ | |
132 | ret__; \ | |
133 | }) | |
134 | ||
135 | /* | |
136 | * The Rockchip rk3288 iommu uses a 2-level page table. | |
137 | * The first level is the "Directory Table" (DT). | |
138 | * The DT consists of 1024 4-byte Directory Table Entries (DTEs), each pointing | |
139 | * to a "Page Table". | |
140 | * The second level is the 1024 Page Tables (PT). | |
141 | * Each PT consists of 1024 4-byte Page Table Entries (PTEs), each pointing to | |
142 | * a 4 KB page of physical memory. | |
143 | * | |
144 | * The DT and each PT fits in a single 4 KB page (4-bytes * 1024 entries). | |
145 | * Each iommu device has a MMU_DTE_ADDR register that contains the physical | |
146 | * address of the start of the DT page. | |
147 | * | |
148 | * The structure of the page table is as follows: | |
149 | * | |
150 | * DT | |
151 | * MMU_DTE_ADDR -> +-----+ | |
152 | * | | | |
153 | * +-----+ PT | |
154 | * | DTE | -> +-----+ | |
155 | * +-----+ | | Memory | |
156 | * | | +-----+ Page | |
157 | * | | | PTE | -> +-----+ | |
158 | * +-----+ +-----+ | | | |
159 | * | | | | | |
160 | * | | | | | |
161 | * +-----+ | | | |
162 | * | | | |
163 | * | | | |
164 | * +-----+ | |
165 | */ | |
166 | ||
167 | /* | |
168 | * Each DTE has a PT address and a valid bit: | |
169 | * +---------------------+-----------+-+ | |
170 | * | PT address | Reserved |V| | |
171 | * +---------------------+-----------+-+ | |
172 | * 31:12 - PT address (PTs always starts on a 4 KB boundary) | |
173 | * 11: 1 - Reserved | |
174 | * 0 - 1 if PT @ PT address is valid | |
175 | */ | |
176 | #define RK_DTE_PT_ADDRESS_MASK 0xfffff000 | |
177 | #define RK_DTE_PT_VALID BIT(0) | |
178 | ||
179 | static inline phys_addr_t rk_dte_pt_address(u32 dte) | |
180 | { | |
181 | return (phys_addr_t)dte & RK_DTE_PT_ADDRESS_MASK; | |
182 | } | |
183 | ||
184 | static inline bool rk_dte_is_pt_valid(u32 dte) | |
185 | { | |
186 | return dte & RK_DTE_PT_VALID; | |
187 | } | |
188 | ||
4f0aba67 | 189 | static inline u32 rk_mk_dte(dma_addr_t pt_dma) |
c68a2921 | 190 | { |
4f0aba67 | 191 | return (pt_dma & RK_DTE_PT_ADDRESS_MASK) | RK_DTE_PT_VALID; |
c68a2921 DK |
192 | } |
193 | ||
194 | /* | |
195 | * Each PTE has a Page address, some flags and a valid bit: | |
196 | * +---------------------+---+-------+-+ | |
197 | * | Page address |Rsv| Flags |V| | |
198 | * +---------------------+---+-------+-+ | |
199 | * 31:12 - Page address (Pages always start on a 4 KB boundary) | |
200 | * 11: 9 - Reserved | |
201 | * 8: 1 - Flags | |
202 | * 8 - Read allocate - allocate cache space on read misses | |
203 | * 7 - Read cache - enable cache & prefetch of data | |
204 | * 6 - Write buffer - enable delaying writes on their way to memory | |
205 | * 5 - Write allocate - allocate cache space on write misses | |
206 | * 4 - Write cache - different writes can be merged together | |
207 | * 3 - Override cache attributes | |
208 | * if 1, bits 4-8 control cache attributes | |
209 | * if 0, the system bus defaults are used | |
210 | * 2 - Writable | |
211 | * 1 - Readable | |
212 | * 0 - 1 if Page @ Page address is valid | |
213 | */ | |
214 | #define RK_PTE_PAGE_ADDRESS_MASK 0xfffff000 | |
215 | #define RK_PTE_PAGE_FLAGS_MASK 0x000001fe | |
216 | #define RK_PTE_PAGE_WRITABLE BIT(2) | |
217 | #define RK_PTE_PAGE_READABLE BIT(1) | |
218 | #define RK_PTE_PAGE_VALID BIT(0) | |
219 | ||
220 | static inline phys_addr_t rk_pte_page_address(u32 pte) | |
221 | { | |
222 | return (phys_addr_t)pte & RK_PTE_PAGE_ADDRESS_MASK; | |
223 | } | |
224 | ||
225 | static inline bool rk_pte_is_page_valid(u32 pte) | |
226 | { | |
227 | return pte & RK_PTE_PAGE_VALID; | |
228 | } | |
229 | ||
230 | /* TODO: set cache flags per prot IOMMU_CACHE */ | |
231 | static u32 rk_mk_pte(phys_addr_t page, int prot) | |
232 | { | |
233 | u32 flags = 0; | |
234 | flags |= (prot & IOMMU_READ) ? RK_PTE_PAGE_READABLE : 0; | |
235 | flags |= (prot & IOMMU_WRITE) ? RK_PTE_PAGE_WRITABLE : 0; | |
236 | page &= RK_PTE_PAGE_ADDRESS_MASK; | |
237 | return page | flags | RK_PTE_PAGE_VALID; | |
238 | } | |
239 | ||
240 | static u32 rk_mk_pte_invalid(u32 pte) | |
241 | { | |
242 | return pte & ~RK_PTE_PAGE_VALID; | |
243 | } | |
244 | ||
245 | /* | |
246 | * rk3288 iova (IOMMU Virtual Address) format | |
247 | * 31 22.21 12.11 0 | |
248 | * +-----------+-----------+-------------+ | |
249 | * | DTE index | PTE index | Page offset | | |
250 | * +-----------+-----------+-------------+ | |
251 | * 31:22 - DTE index - index of DTE in DT | |
252 | * 21:12 - PTE index - index of PTE in PT @ DTE.pt_address | |
253 | * 11: 0 - Page offset - offset into page @ PTE.page_address | |
254 | */ | |
255 | #define RK_IOVA_DTE_MASK 0xffc00000 | |
256 | #define RK_IOVA_DTE_SHIFT 22 | |
257 | #define RK_IOVA_PTE_MASK 0x003ff000 | |
258 | #define RK_IOVA_PTE_SHIFT 12 | |
259 | #define RK_IOVA_PAGE_MASK 0x00000fff | |
260 | #define RK_IOVA_PAGE_SHIFT 0 | |
261 | ||
262 | static u32 rk_iova_dte_index(dma_addr_t iova) | |
263 | { | |
264 | return (u32)(iova & RK_IOVA_DTE_MASK) >> RK_IOVA_DTE_SHIFT; | |
265 | } | |
266 | ||
267 | static u32 rk_iova_pte_index(dma_addr_t iova) | |
268 | { | |
269 | return (u32)(iova & RK_IOVA_PTE_MASK) >> RK_IOVA_PTE_SHIFT; | |
270 | } | |
271 | ||
272 | static u32 rk_iova_page_offset(dma_addr_t iova) | |
273 | { | |
274 | return (u32)(iova & RK_IOVA_PAGE_MASK) >> RK_IOVA_PAGE_SHIFT; | |
275 | } | |
276 | ||
cd6438c5 | 277 | static u32 rk_iommu_read(void __iomem *base, u32 offset) |
c68a2921 | 278 | { |
cd6438c5 | 279 | return readl(base + offset); |
c68a2921 DK |
280 | } |
281 | ||
cd6438c5 | 282 | static void rk_iommu_write(void __iomem *base, u32 offset, u32 value) |
c68a2921 | 283 | { |
cd6438c5 | 284 | writel(value, base + offset); |
c68a2921 DK |
285 | } |
286 | ||
287 | static void rk_iommu_command(struct rk_iommu *iommu, u32 command) | |
288 | { | |
cd6438c5 Z |
289 | int i; |
290 | ||
291 | for (i = 0; i < iommu->num_mmu; i++) | |
292 | writel(command, iommu->bases[i] + RK_MMU_COMMAND); | |
c68a2921 DK |
293 | } |
294 | ||
cd6438c5 Z |
295 | static void rk_iommu_base_command(void __iomem *base, u32 command) |
296 | { | |
297 | writel(command, base + RK_MMU_COMMAND); | |
298 | } | |
c68a2921 DK |
299 | static void rk_iommu_zap_lines(struct rk_iommu *iommu, dma_addr_t iova, |
300 | size_t size) | |
301 | { | |
cd6438c5 Z |
302 | int i; |
303 | ||
c68a2921 DK |
304 | dma_addr_t iova_end = iova + size; |
305 | /* | |
306 | * TODO(djkurtz): Figure out when it is more efficient to shootdown the | |
307 | * entire iotlb rather than iterate over individual iovas. | |
308 | */ | |
cd6438c5 Z |
309 | for (i = 0; i < iommu->num_mmu; i++) |
310 | for (; iova < iova_end; iova += SPAGE_SIZE) | |
311 | rk_iommu_write(iommu->bases[i], RK_MMU_ZAP_ONE_LINE, iova); | |
c68a2921 DK |
312 | } |
313 | ||
314 | static bool rk_iommu_is_stall_active(struct rk_iommu *iommu) | |
315 | { | |
cd6438c5 Z |
316 | bool active = true; |
317 | int i; | |
318 | ||
319 | for (i = 0; i < iommu->num_mmu; i++) | |
fbedd9b9 JK |
320 | active &= !!(rk_iommu_read(iommu->bases[i], RK_MMU_STATUS) & |
321 | RK_MMU_STATUS_STALL_ACTIVE); | |
cd6438c5 Z |
322 | |
323 | return active; | |
c68a2921 DK |
324 | } |
325 | ||
326 | static bool rk_iommu_is_paging_enabled(struct rk_iommu *iommu) | |
327 | { | |
cd6438c5 Z |
328 | bool enable = true; |
329 | int i; | |
330 | ||
331 | for (i = 0; i < iommu->num_mmu; i++) | |
fbedd9b9 JK |
332 | enable &= !!(rk_iommu_read(iommu->bases[i], RK_MMU_STATUS) & |
333 | RK_MMU_STATUS_PAGING_ENABLED); | |
cd6438c5 Z |
334 | |
335 | return enable; | |
c68a2921 DK |
336 | } |
337 | ||
338 | static int rk_iommu_enable_stall(struct rk_iommu *iommu) | |
339 | { | |
cd6438c5 | 340 | int ret, i; |
c68a2921 DK |
341 | |
342 | if (rk_iommu_is_stall_active(iommu)) | |
343 | return 0; | |
344 | ||
345 | /* Stall can only be enabled if paging is enabled */ | |
346 | if (!rk_iommu_is_paging_enabled(iommu)) | |
347 | return 0; | |
348 | ||
349 | rk_iommu_command(iommu, RK_MMU_CMD_ENABLE_STALL); | |
350 | ||
351 | ret = rk_wait_for(rk_iommu_is_stall_active(iommu), 1); | |
352 | if (ret) | |
cd6438c5 Z |
353 | for (i = 0; i < iommu->num_mmu; i++) |
354 | dev_err(iommu->dev, "Enable stall request timed out, status: %#08x\n", | |
355 | rk_iommu_read(iommu->bases[i], RK_MMU_STATUS)); | |
c68a2921 DK |
356 | |
357 | return ret; | |
358 | } | |
359 | ||
360 | static int rk_iommu_disable_stall(struct rk_iommu *iommu) | |
361 | { | |
cd6438c5 | 362 | int ret, i; |
c68a2921 DK |
363 | |
364 | if (!rk_iommu_is_stall_active(iommu)) | |
365 | return 0; | |
366 | ||
367 | rk_iommu_command(iommu, RK_MMU_CMD_DISABLE_STALL); | |
368 | ||
369 | ret = rk_wait_for(!rk_iommu_is_stall_active(iommu), 1); | |
370 | if (ret) | |
cd6438c5 Z |
371 | for (i = 0; i < iommu->num_mmu; i++) |
372 | dev_err(iommu->dev, "Disable stall request timed out, status: %#08x\n", | |
373 | rk_iommu_read(iommu->bases[i], RK_MMU_STATUS)); | |
c68a2921 DK |
374 | |
375 | return ret; | |
376 | } | |
377 | ||
378 | static int rk_iommu_enable_paging(struct rk_iommu *iommu) | |
379 | { | |
cd6438c5 | 380 | int ret, i; |
c68a2921 DK |
381 | |
382 | if (rk_iommu_is_paging_enabled(iommu)) | |
383 | return 0; | |
384 | ||
385 | rk_iommu_command(iommu, RK_MMU_CMD_ENABLE_PAGING); | |
386 | ||
387 | ret = rk_wait_for(rk_iommu_is_paging_enabled(iommu), 1); | |
388 | if (ret) | |
cd6438c5 Z |
389 | for (i = 0; i < iommu->num_mmu; i++) |
390 | dev_err(iommu->dev, "Enable paging request timed out, status: %#08x\n", | |
391 | rk_iommu_read(iommu->bases[i], RK_MMU_STATUS)); | |
c68a2921 DK |
392 | |
393 | return ret; | |
394 | } | |
395 | ||
396 | static int rk_iommu_disable_paging(struct rk_iommu *iommu) | |
397 | { | |
cd6438c5 | 398 | int ret, i; |
c68a2921 DK |
399 | |
400 | if (!rk_iommu_is_paging_enabled(iommu)) | |
401 | return 0; | |
402 | ||
403 | rk_iommu_command(iommu, RK_MMU_CMD_DISABLE_PAGING); | |
404 | ||
405 | ret = rk_wait_for(!rk_iommu_is_paging_enabled(iommu), 1); | |
406 | if (ret) | |
cd6438c5 Z |
407 | for (i = 0; i < iommu->num_mmu; i++) |
408 | dev_err(iommu->dev, "Disable paging request timed out, status: %#08x\n", | |
409 | rk_iommu_read(iommu->bases[i], RK_MMU_STATUS)); | |
c68a2921 DK |
410 | |
411 | return ret; | |
412 | } | |
413 | ||
414 | static int rk_iommu_force_reset(struct rk_iommu *iommu) | |
415 | { | |
cd6438c5 | 416 | int ret, i; |
c68a2921 DK |
417 | u32 dte_addr; |
418 | ||
c3aa4742 SX |
419 | if (iommu->reset_disabled) |
420 | return 0; | |
421 | ||
c68a2921 DK |
422 | /* |
423 | * Check if register DTE_ADDR is working by writing DTE_ADDR_DUMMY | |
424 | * and verifying that upper 5 nybbles are read back. | |
425 | */ | |
cd6438c5 Z |
426 | for (i = 0; i < iommu->num_mmu; i++) { |
427 | rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, DTE_ADDR_DUMMY); | |
c68a2921 | 428 | |
cd6438c5 Z |
429 | dte_addr = rk_iommu_read(iommu->bases[i], RK_MMU_DTE_ADDR); |
430 | if (dte_addr != (DTE_ADDR_DUMMY & RK_DTE_PT_ADDRESS_MASK)) { | |
431 | dev_err(iommu->dev, "Error during raw reset. MMU_DTE_ADDR is not functioning\n"); | |
432 | return -EFAULT; | |
433 | } | |
c68a2921 DK |
434 | } |
435 | ||
436 | rk_iommu_command(iommu, RK_MMU_CMD_FORCE_RESET); | |
437 | ||
cd6438c5 Z |
438 | for (i = 0; i < iommu->num_mmu; i++) { |
439 | ret = rk_wait_for(rk_iommu_read(iommu->bases[i], RK_MMU_DTE_ADDR) == 0x00000000, | |
440 | FORCE_RESET_TIMEOUT); | |
441 | if (ret) { | |
442 | dev_err(iommu->dev, "FORCE_RESET command timed out\n"); | |
443 | return ret; | |
444 | } | |
445 | } | |
c68a2921 | 446 | |
cd6438c5 | 447 | return 0; |
c68a2921 DK |
448 | } |
449 | ||
cd6438c5 | 450 | static void log_iova(struct rk_iommu *iommu, int index, dma_addr_t iova) |
c68a2921 | 451 | { |
cd6438c5 | 452 | void __iomem *base = iommu->bases[index]; |
c68a2921 DK |
453 | u32 dte_index, pte_index, page_offset; |
454 | u32 mmu_dte_addr; | |
455 | phys_addr_t mmu_dte_addr_phys, dte_addr_phys; | |
456 | u32 *dte_addr; | |
457 | u32 dte; | |
458 | phys_addr_t pte_addr_phys = 0; | |
459 | u32 *pte_addr = NULL; | |
460 | u32 pte = 0; | |
461 | phys_addr_t page_addr_phys = 0; | |
462 | u32 page_flags = 0; | |
463 | ||
464 | dte_index = rk_iova_dte_index(iova); | |
465 | pte_index = rk_iova_pte_index(iova); | |
466 | page_offset = rk_iova_page_offset(iova); | |
467 | ||
cd6438c5 | 468 | mmu_dte_addr = rk_iommu_read(base, RK_MMU_DTE_ADDR); |
c68a2921 DK |
469 | mmu_dte_addr_phys = (phys_addr_t)mmu_dte_addr; |
470 | ||
471 | dte_addr_phys = mmu_dte_addr_phys + (4 * dte_index); | |
472 | dte_addr = phys_to_virt(dte_addr_phys); | |
473 | dte = *dte_addr; | |
474 | ||
475 | if (!rk_dte_is_pt_valid(dte)) | |
476 | goto print_it; | |
477 | ||
478 | pte_addr_phys = rk_dte_pt_address(dte) + (pte_index * 4); | |
479 | pte_addr = phys_to_virt(pte_addr_phys); | |
480 | pte = *pte_addr; | |
481 | ||
482 | if (!rk_pte_is_page_valid(pte)) | |
483 | goto print_it; | |
484 | ||
485 | page_addr_phys = rk_pte_page_address(pte) + page_offset; | |
486 | page_flags = pte & RK_PTE_PAGE_FLAGS_MASK; | |
487 | ||
488 | print_it: | |
489 | dev_err(iommu->dev, "iova = %pad: dte_index: %#03x pte_index: %#03x page_offset: %#03x\n", | |
490 | &iova, dte_index, pte_index, page_offset); | |
491 | dev_err(iommu->dev, "mmu_dte_addr: %pa dte@%pa: %#08x valid: %u pte@%pa: %#08x valid: %u page@%pa flags: %#03x\n", | |
492 | &mmu_dte_addr_phys, &dte_addr_phys, dte, | |
493 | rk_dte_is_pt_valid(dte), &pte_addr_phys, pte, | |
494 | rk_pte_is_page_valid(pte), &page_addr_phys, page_flags); | |
495 | } | |
496 | ||
497 | static irqreturn_t rk_iommu_irq(int irq, void *dev_id) | |
498 | { | |
499 | struct rk_iommu *iommu = dev_id; | |
500 | u32 status; | |
501 | u32 int_status; | |
502 | dma_addr_t iova; | |
cd6438c5 Z |
503 | irqreturn_t ret = IRQ_NONE; |
504 | int i; | |
c68a2921 | 505 | |
cd6438c5 Z |
506 | for (i = 0; i < iommu->num_mmu; i++) { |
507 | int_status = rk_iommu_read(iommu->bases[i], RK_MMU_INT_STATUS); | |
508 | if (int_status == 0) | |
509 | continue; | |
c68a2921 | 510 | |
cd6438c5 Z |
511 | ret = IRQ_HANDLED; |
512 | iova = rk_iommu_read(iommu->bases[i], RK_MMU_PAGE_FAULT_ADDR); | |
c68a2921 | 513 | |
cd6438c5 Z |
514 | if (int_status & RK_MMU_IRQ_PAGE_FAULT) { |
515 | int flags; | |
c68a2921 | 516 | |
cd6438c5 Z |
517 | status = rk_iommu_read(iommu->bases[i], RK_MMU_STATUS); |
518 | flags = (status & RK_MMU_STATUS_PAGE_FAULT_IS_WRITE) ? | |
519 | IOMMU_FAULT_WRITE : IOMMU_FAULT_READ; | |
c68a2921 | 520 | |
cd6438c5 Z |
521 | dev_err(iommu->dev, "Page fault at %pad of type %s\n", |
522 | &iova, | |
523 | (flags == IOMMU_FAULT_WRITE) ? "write" : "read"); | |
c68a2921 | 524 | |
cd6438c5 | 525 | log_iova(iommu, i, iova); |
c68a2921 | 526 | |
cd6438c5 Z |
527 | /* |
528 | * Report page fault to any installed handlers. | |
529 | * Ignore the return code, though, since we always zap cache | |
530 | * and clear the page fault anyway. | |
531 | */ | |
532 | if (iommu->domain) | |
533 | report_iommu_fault(iommu->domain, iommu->dev, iova, | |
534 | flags); | |
535 | else | |
536 | dev_err(iommu->dev, "Page fault while iommu not attached to domain?\n"); | |
c68a2921 | 537 | |
cd6438c5 Z |
538 | rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_ZAP_CACHE); |
539 | rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_PAGE_FAULT_DONE); | |
540 | } | |
c68a2921 | 541 | |
cd6438c5 Z |
542 | if (int_status & RK_MMU_IRQ_BUS_ERROR) |
543 | dev_err(iommu->dev, "BUS_ERROR occurred at %pad\n", &iova); | |
c68a2921 | 544 | |
cd6438c5 Z |
545 | if (int_status & ~RK_MMU_IRQ_MASK) |
546 | dev_err(iommu->dev, "unexpected int_status: %#08x\n", | |
547 | int_status); | |
c68a2921 | 548 | |
cd6438c5 Z |
549 | rk_iommu_write(iommu->bases[i], RK_MMU_INT_CLEAR, int_status); |
550 | } | |
c68a2921 | 551 | |
cd6438c5 | 552 | return ret; |
c68a2921 DK |
553 | } |
554 | ||
555 | static phys_addr_t rk_iommu_iova_to_phys(struct iommu_domain *domain, | |
556 | dma_addr_t iova) | |
557 | { | |
bcd516a3 | 558 | struct rk_iommu_domain *rk_domain = to_rk_domain(domain); |
c68a2921 DK |
559 | unsigned long flags; |
560 | phys_addr_t pt_phys, phys = 0; | |
561 | u32 dte, pte; | |
562 | u32 *page_table; | |
563 | ||
564 | spin_lock_irqsave(&rk_domain->dt_lock, flags); | |
565 | ||
566 | dte = rk_domain->dt[rk_iova_dte_index(iova)]; | |
567 | if (!rk_dte_is_pt_valid(dte)) | |
568 | goto out; | |
569 | ||
570 | pt_phys = rk_dte_pt_address(dte); | |
571 | page_table = (u32 *)phys_to_virt(pt_phys); | |
572 | pte = page_table[rk_iova_pte_index(iova)]; | |
573 | if (!rk_pte_is_page_valid(pte)) | |
574 | goto out; | |
575 | ||
576 | phys = rk_pte_page_address(pte) + rk_iova_page_offset(iova); | |
577 | out: | |
578 | spin_unlock_irqrestore(&rk_domain->dt_lock, flags); | |
579 | ||
580 | return phys; | |
581 | } | |
582 | ||
583 | static void rk_iommu_zap_iova(struct rk_iommu_domain *rk_domain, | |
584 | dma_addr_t iova, size_t size) | |
585 | { | |
586 | struct list_head *pos; | |
587 | unsigned long flags; | |
588 | ||
589 | /* shootdown these iova from all iommus using this domain */ | |
590 | spin_lock_irqsave(&rk_domain->iommus_lock, flags); | |
591 | list_for_each(pos, &rk_domain->iommus) { | |
592 | struct rk_iommu *iommu; | |
593 | iommu = list_entry(pos, struct rk_iommu, node); | |
594 | rk_iommu_zap_lines(iommu, iova, size); | |
595 | } | |
596 | spin_unlock_irqrestore(&rk_domain->iommus_lock, flags); | |
597 | } | |
598 | ||
d4dd920c TF |
599 | static void rk_iommu_zap_iova_first_last(struct rk_iommu_domain *rk_domain, |
600 | dma_addr_t iova, size_t size) | |
601 | { | |
602 | rk_iommu_zap_iova(rk_domain, iova, SPAGE_SIZE); | |
603 | if (size > SPAGE_SIZE) | |
604 | rk_iommu_zap_iova(rk_domain, iova + size - SPAGE_SIZE, | |
605 | SPAGE_SIZE); | |
606 | } | |
607 | ||
c68a2921 DK |
608 | static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain, |
609 | dma_addr_t iova) | |
610 | { | |
4f0aba67 | 611 | struct device *dev = &rk_domain->pdev->dev; |
c68a2921 | 612 | u32 *page_table, *dte_addr; |
4f0aba67 | 613 | u32 dte_index, dte; |
c68a2921 | 614 | phys_addr_t pt_phys; |
4f0aba67 | 615 | dma_addr_t pt_dma; |
c68a2921 DK |
616 | |
617 | assert_spin_locked(&rk_domain->dt_lock); | |
618 | ||
4f0aba67 SZ |
619 | dte_index = rk_iova_dte_index(iova); |
620 | dte_addr = &rk_domain->dt[dte_index]; | |
c68a2921 DK |
621 | dte = *dte_addr; |
622 | if (rk_dte_is_pt_valid(dte)) | |
623 | goto done; | |
624 | ||
625 | page_table = (u32 *)get_zeroed_page(GFP_ATOMIC | GFP_DMA32); | |
626 | if (!page_table) | |
627 | return ERR_PTR(-ENOMEM); | |
628 | ||
4f0aba67 SZ |
629 | pt_dma = dma_map_single(dev, page_table, SPAGE_SIZE, DMA_TO_DEVICE); |
630 | if (dma_mapping_error(dev, pt_dma)) { | |
631 | dev_err(dev, "DMA mapping error while allocating page table\n"); | |
632 | free_page((unsigned long)page_table); | |
633 | return ERR_PTR(-ENOMEM); | |
634 | } | |
c68a2921 | 635 | |
4f0aba67 SZ |
636 | dte = rk_mk_dte(pt_dma); |
637 | *dte_addr = dte; | |
c68a2921 | 638 | |
4f0aba67 SZ |
639 | rk_table_flush(rk_domain, pt_dma, NUM_PT_ENTRIES); |
640 | rk_table_flush(rk_domain, | |
641 | rk_domain->dt_dma + dte_index * sizeof(u32), 1); | |
c68a2921 DK |
642 | done: |
643 | pt_phys = rk_dte_pt_address(dte); | |
644 | return (u32 *)phys_to_virt(pt_phys); | |
645 | } | |
646 | ||
647 | static size_t rk_iommu_unmap_iova(struct rk_iommu_domain *rk_domain, | |
4f0aba67 SZ |
648 | u32 *pte_addr, dma_addr_t pte_dma, |
649 | size_t size) | |
c68a2921 DK |
650 | { |
651 | unsigned int pte_count; | |
652 | unsigned int pte_total = size / SPAGE_SIZE; | |
653 | ||
654 | assert_spin_locked(&rk_domain->dt_lock); | |
655 | ||
656 | for (pte_count = 0; pte_count < pte_total; pte_count++) { | |
657 | u32 pte = pte_addr[pte_count]; | |
658 | if (!rk_pte_is_page_valid(pte)) | |
659 | break; | |
660 | ||
661 | pte_addr[pte_count] = rk_mk_pte_invalid(pte); | |
662 | } | |
663 | ||
4f0aba67 | 664 | rk_table_flush(rk_domain, pte_dma, pte_count); |
c68a2921 DK |
665 | |
666 | return pte_count * SPAGE_SIZE; | |
667 | } | |
668 | ||
669 | static int rk_iommu_map_iova(struct rk_iommu_domain *rk_domain, u32 *pte_addr, | |
4f0aba67 SZ |
670 | dma_addr_t pte_dma, dma_addr_t iova, |
671 | phys_addr_t paddr, size_t size, int prot) | |
c68a2921 DK |
672 | { |
673 | unsigned int pte_count; | |
674 | unsigned int pte_total = size / SPAGE_SIZE; | |
675 | phys_addr_t page_phys; | |
676 | ||
677 | assert_spin_locked(&rk_domain->dt_lock); | |
678 | ||
679 | for (pte_count = 0; pte_count < pte_total; pte_count++) { | |
680 | u32 pte = pte_addr[pte_count]; | |
681 | ||
682 | if (rk_pte_is_page_valid(pte)) | |
683 | goto unwind; | |
684 | ||
685 | pte_addr[pte_count] = rk_mk_pte(paddr, prot); | |
686 | ||
687 | paddr += SPAGE_SIZE; | |
688 | } | |
689 | ||
4f0aba67 | 690 | rk_table_flush(rk_domain, pte_dma, pte_total); |
c68a2921 | 691 | |
d4dd920c TF |
692 | /* |
693 | * Zap the first and last iova to evict from iotlb any previously | |
694 | * mapped cachelines holding stale values for its dte and pte. | |
695 | * We only zap the first and last iova, since only they could have | |
696 | * dte or pte shared with an existing mapping. | |
697 | */ | |
698 | rk_iommu_zap_iova_first_last(rk_domain, iova, size); | |
699 | ||
c68a2921 DK |
700 | return 0; |
701 | unwind: | |
702 | /* Unmap the range of iovas that we just mapped */ | |
4f0aba67 SZ |
703 | rk_iommu_unmap_iova(rk_domain, pte_addr, pte_dma, |
704 | pte_count * SPAGE_SIZE); | |
c68a2921 DK |
705 | |
706 | iova += pte_count * SPAGE_SIZE; | |
707 | page_phys = rk_pte_page_address(pte_addr[pte_count]); | |
708 | pr_err("iova: %pad already mapped to %pa cannot remap to phys: %pa prot: %#x\n", | |
709 | &iova, &page_phys, &paddr, prot); | |
710 | ||
711 | return -EADDRINUSE; | |
712 | } | |
713 | ||
714 | static int rk_iommu_map(struct iommu_domain *domain, unsigned long _iova, | |
715 | phys_addr_t paddr, size_t size, int prot) | |
716 | { | |
bcd516a3 | 717 | struct rk_iommu_domain *rk_domain = to_rk_domain(domain); |
c68a2921 | 718 | unsigned long flags; |
4f0aba67 | 719 | dma_addr_t pte_dma, iova = (dma_addr_t)_iova; |
c68a2921 | 720 | u32 *page_table, *pte_addr; |
4f0aba67 | 721 | u32 dte_index, pte_index; |
c68a2921 DK |
722 | int ret; |
723 | ||
724 | spin_lock_irqsave(&rk_domain->dt_lock, flags); | |
725 | ||
726 | /* | |
727 | * pgsize_bitmap specifies iova sizes that fit in one page table | |
728 | * (1024 4-KiB pages = 4 MiB). | |
729 | * So, size will always be 4096 <= size <= 4194304. | |
730 | * Since iommu_map() guarantees that both iova and size will be | |
731 | * aligned, we will always only be mapping from a single dte here. | |
732 | */ | |
733 | page_table = rk_dte_get_page_table(rk_domain, iova); | |
734 | if (IS_ERR(page_table)) { | |
735 | spin_unlock_irqrestore(&rk_domain->dt_lock, flags); | |
736 | return PTR_ERR(page_table); | |
737 | } | |
738 | ||
4f0aba67 SZ |
739 | dte_index = rk_domain->dt[rk_iova_dte_index(iova)]; |
740 | pte_index = rk_iova_pte_index(iova); | |
741 | pte_addr = &page_table[pte_index]; | |
742 | pte_dma = rk_dte_pt_address(dte_index) + pte_index * sizeof(u32); | |
743 | ret = rk_iommu_map_iova(rk_domain, pte_addr, pte_dma, iova, | |
744 | paddr, size, prot); | |
745 | ||
c68a2921 DK |
746 | spin_unlock_irqrestore(&rk_domain->dt_lock, flags); |
747 | ||
748 | return ret; | |
749 | } | |
750 | ||
751 | static size_t rk_iommu_unmap(struct iommu_domain *domain, unsigned long _iova, | |
752 | size_t size) | |
753 | { | |
bcd516a3 | 754 | struct rk_iommu_domain *rk_domain = to_rk_domain(domain); |
c68a2921 | 755 | unsigned long flags; |
4f0aba67 | 756 | dma_addr_t pte_dma, iova = (dma_addr_t)_iova; |
c68a2921 DK |
757 | phys_addr_t pt_phys; |
758 | u32 dte; | |
759 | u32 *pte_addr; | |
760 | size_t unmap_size; | |
761 | ||
762 | spin_lock_irqsave(&rk_domain->dt_lock, flags); | |
763 | ||
764 | /* | |
765 | * pgsize_bitmap specifies iova sizes that fit in one page table | |
766 | * (1024 4-KiB pages = 4 MiB). | |
767 | * So, size will always be 4096 <= size <= 4194304. | |
768 | * Since iommu_unmap() guarantees that both iova and size will be | |
769 | * aligned, we will always only be unmapping from a single dte here. | |
770 | */ | |
771 | dte = rk_domain->dt[rk_iova_dte_index(iova)]; | |
772 | /* Just return 0 if iova is unmapped */ | |
773 | if (!rk_dte_is_pt_valid(dte)) { | |
774 | spin_unlock_irqrestore(&rk_domain->dt_lock, flags); | |
775 | return 0; | |
776 | } | |
777 | ||
778 | pt_phys = rk_dte_pt_address(dte); | |
779 | pte_addr = (u32 *)phys_to_virt(pt_phys) + rk_iova_pte_index(iova); | |
4f0aba67 SZ |
780 | pte_dma = pt_phys + rk_iova_pte_index(iova) * sizeof(u32); |
781 | unmap_size = rk_iommu_unmap_iova(rk_domain, pte_addr, pte_dma, size); | |
c68a2921 DK |
782 | |
783 | spin_unlock_irqrestore(&rk_domain->dt_lock, flags); | |
784 | ||
785 | /* Shootdown iotlb entries for iova range that was just unmapped */ | |
786 | rk_iommu_zap_iova(rk_domain, iova, unmap_size); | |
787 | ||
788 | return unmap_size; | |
789 | } | |
790 | ||
791 | static struct rk_iommu *rk_iommu_from_dev(struct device *dev) | |
792 | { | |
793 | struct iommu_group *group; | |
794 | struct device *iommu_dev; | |
795 | struct rk_iommu *rk_iommu; | |
796 | ||
797 | group = iommu_group_get(dev); | |
798 | if (!group) | |
799 | return NULL; | |
800 | iommu_dev = iommu_group_get_iommudata(group); | |
801 | rk_iommu = dev_get_drvdata(iommu_dev); | |
802 | iommu_group_put(group); | |
803 | ||
804 | return rk_iommu; | |
805 | } | |
806 | ||
807 | static int rk_iommu_attach_device(struct iommu_domain *domain, | |
808 | struct device *dev) | |
809 | { | |
810 | struct rk_iommu *iommu; | |
bcd516a3 | 811 | struct rk_iommu_domain *rk_domain = to_rk_domain(domain); |
c68a2921 | 812 | unsigned long flags; |
cd6438c5 | 813 | int ret, i; |
c68a2921 DK |
814 | |
815 | /* | |
816 | * Allow 'virtual devices' (e.g., drm) to attach to domain. | |
817 | * Such a device does not belong to an iommu group. | |
818 | */ | |
819 | iommu = rk_iommu_from_dev(dev); | |
820 | if (!iommu) | |
821 | return 0; | |
822 | ||
823 | ret = rk_iommu_enable_stall(iommu); | |
824 | if (ret) | |
825 | return ret; | |
826 | ||
827 | ret = rk_iommu_force_reset(iommu); | |
828 | if (ret) | |
829 | return ret; | |
830 | ||
831 | iommu->domain = domain; | |
832 | ||
03f732f8 SX |
833 | for (i = 0; i < iommu->num_irq; i++) { |
834 | ret = devm_request_irq(iommu->dev, iommu->irq[i], rk_iommu_irq, | |
835 | IRQF_SHARED, dev_name(dev), iommu); | |
836 | if (ret) | |
837 | return ret; | |
838 | } | |
c68a2921 | 839 | |
cd6438c5 | 840 | for (i = 0; i < iommu->num_mmu; i++) { |
4f0aba67 SZ |
841 | rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, |
842 | rk_domain->dt_dma); | |
ae8a7910 | 843 | rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_ZAP_CACHE); |
cd6438c5 Z |
844 | rk_iommu_write(iommu->bases[i], RK_MMU_INT_MASK, RK_MMU_IRQ_MASK); |
845 | } | |
c68a2921 DK |
846 | |
847 | ret = rk_iommu_enable_paging(iommu); | |
848 | if (ret) | |
849 | return ret; | |
850 | ||
851 | spin_lock_irqsave(&rk_domain->iommus_lock, flags); | |
852 | list_add_tail(&iommu->node, &rk_domain->iommus); | |
853 | spin_unlock_irqrestore(&rk_domain->iommus_lock, flags); | |
854 | ||
ec4292de | 855 | dev_dbg(dev, "Attached to iommu domain\n"); |
c68a2921 DK |
856 | |
857 | rk_iommu_disable_stall(iommu); | |
858 | ||
859 | return 0; | |
860 | } | |
861 | ||
862 | static void rk_iommu_detach_device(struct iommu_domain *domain, | |
863 | struct device *dev) | |
864 | { | |
865 | struct rk_iommu *iommu; | |
bcd516a3 | 866 | struct rk_iommu_domain *rk_domain = to_rk_domain(domain); |
c68a2921 | 867 | unsigned long flags; |
cd6438c5 | 868 | int i; |
c68a2921 DK |
869 | |
870 | /* Allow 'virtual devices' (eg drm) to detach from domain */ | |
871 | iommu = rk_iommu_from_dev(dev); | |
872 | if (!iommu) | |
873 | return; | |
874 | ||
875 | spin_lock_irqsave(&rk_domain->iommus_lock, flags); | |
876 | list_del_init(&iommu->node); | |
877 | spin_unlock_irqrestore(&rk_domain->iommus_lock, flags); | |
878 | ||
879 | /* Ignore error while disabling, just keep going */ | |
880 | rk_iommu_enable_stall(iommu); | |
881 | rk_iommu_disable_paging(iommu); | |
cd6438c5 Z |
882 | for (i = 0; i < iommu->num_mmu; i++) { |
883 | rk_iommu_write(iommu->bases[i], RK_MMU_INT_MASK, 0); | |
884 | rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, 0); | |
885 | } | |
c68a2921 DK |
886 | rk_iommu_disable_stall(iommu); |
887 | ||
03f732f8 SX |
888 | for (i = 0; i < iommu->num_irq; i++) |
889 | devm_free_irq(iommu->dev, iommu->irq[i], iommu); | |
c68a2921 DK |
890 | |
891 | iommu->domain = NULL; | |
892 | ||
ec4292de | 893 | dev_dbg(dev, "Detached from iommu domain\n"); |
c68a2921 DK |
894 | } |
895 | ||
bcd516a3 | 896 | static struct iommu_domain *rk_iommu_domain_alloc(unsigned type) |
c68a2921 DK |
897 | { |
898 | struct rk_iommu_domain *rk_domain; | |
4f0aba67 SZ |
899 | struct platform_device *pdev; |
900 | struct device *iommu_dev; | |
c68a2921 | 901 | |
a93db2f2 | 902 | if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA) |
bcd516a3 JR |
903 | return NULL; |
904 | ||
4f0aba67 SZ |
905 | /* Register a pdev per domain, so DMA API can base on this *dev |
906 | * even some virtual master doesn't have an iommu slave | |
907 | */ | |
908 | pdev = platform_device_register_simple("rk_iommu_domain", | |
909 | PLATFORM_DEVID_AUTO, NULL, 0); | |
910 | if (IS_ERR(pdev)) | |
bcd516a3 | 911 | return NULL; |
c68a2921 | 912 | |
4f0aba67 SZ |
913 | rk_domain = devm_kzalloc(&pdev->dev, sizeof(*rk_domain), GFP_KERNEL); |
914 | if (!rk_domain) | |
915 | goto err_unreg_pdev; | |
916 | ||
917 | rk_domain->pdev = pdev; | |
918 | ||
a93db2f2 SZ |
919 | if (type == IOMMU_DOMAIN_DMA && |
920 | iommu_get_dma_cookie(&rk_domain->domain)) | |
4f0aba67 SZ |
921 | goto err_unreg_pdev; |
922 | ||
c68a2921 DK |
923 | /* |
924 | * rk32xx iommus use a 2 level pagetable. | |
925 | * Each level1 (dt) and level2 (pt) table has 1024 4-byte entries. | |
926 | * Allocate one 4 KiB page for each table. | |
927 | */ | |
928 | rk_domain->dt = (u32 *)get_zeroed_page(GFP_KERNEL | GFP_DMA32); | |
929 | if (!rk_domain->dt) | |
4f0aba67 SZ |
930 | goto err_put_cookie; |
931 | ||
932 | iommu_dev = &pdev->dev; | |
933 | rk_domain->dt_dma = dma_map_single(iommu_dev, rk_domain->dt, | |
934 | SPAGE_SIZE, DMA_TO_DEVICE); | |
935 | if (dma_mapping_error(iommu_dev, rk_domain->dt_dma)) { | |
936 | dev_err(iommu_dev, "DMA map error for DT\n"); | |
937 | goto err_free_dt; | |
938 | } | |
c68a2921 | 939 | |
4f0aba67 | 940 | rk_table_flush(rk_domain, rk_domain->dt_dma, NUM_DT_ENTRIES); |
c68a2921 DK |
941 | |
942 | spin_lock_init(&rk_domain->iommus_lock); | |
943 | spin_lock_init(&rk_domain->dt_lock); | |
944 | INIT_LIST_HEAD(&rk_domain->iommus); | |
945 | ||
a93db2f2 SZ |
946 | rk_domain->domain.geometry.aperture_start = 0; |
947 | rk_domain->domain.geometry.aperture_end = DMA_BIT_MASK(32); | |
948 | rk_domain->domain.geometry.force_aperture = true; | |
949 | ||
bcd516a3 | 950 | return &rk_domain->domain; |
c68a2921 | 951 | |
4f0aba67 SZ |
952 | err_free_dt: |
953 | free_page((unsigned long)rk_domain->dt); | |
954 | err_put_cookie: | |
a93db2f2 SZ |
955 | if (type == IOMMU_DOMAIN_DMA) |
956 | iommu_put_dma_cookie(&rk_domain->domain); | |
4f0aba67 SZ |
957 | err_unreg_pdev: |
958 | platform_device_unregister(pdev); | |
959 | ||
bcd516a3 | 960 | return NULL; |
c68a2921 DK |
961 | } |
962 | ||
bcd516a3 | 963 | static void rk_iommu_domain_free(struct iommu_domain *domain) |
c68a2921 | 964 | { |
bcd516a3 | 965 | struct rk_iommu_domain *rk_domain = to_rk_domain(domain); |
c68a2921 DK |
966 | int i; |
967 | ||
968 | WARN_ON(!list_empty(&rk_domain->iommus)); | |
969 | ||
970 | for (i = 0; i < NUM_DT_ENTRIES; i++) { | |
971 | u32 dte = rk_domain->dt[i]; | |
972 | if (rk_dte_is_pt_valid(dte)) { | |
973 | phys_addr_t pt_phys = rk_dte_pt_address(dte); | |
974 | u32 *page_table = phys_to_virt(pt_phys); | |
4f0aba67 SZ |
975 | dma_unmap_single(&rk_domain->pdev->dev, pt_phys, |
976 | SPAGE_SIZE, DMA_TO_DEVICE); | |
c68a2921 DK |
977 | free_page((unsigned long)page_table); |
978 | } | |
979 | } | |
980 | ||
4f0aba67 SZ |
981 | dma_unmap_single(&rk_domain->pdev->dev, rk_domain->dt_dma, |
982 | SPAGE_SIZE, DMA_TO_DEVICE); | |
c68a2921 | 983 | free_page((unsigned long)rk_domain->dt); |
4f0aba67 | 984 | |
a93db2f2 SZ |
985 | if (domain->type == IOMMU_DOMAIN_DMA) |
986 | iommu_put_dma_cookie(&rk_domain->domain); | |
4f0aba67 SZ |
987 | |
988 | platform_device_unregister(rk_domain->pdev); | |
c68a2921 DK |
989 | } |
990 | ||
991 | static bool rk_iommu_is_dev_iommu_master(struct device *dev) | |
992 | { | |
993 | struct device_node *np = dev->of_node; | |
994 | int ret; | |
995 | ||
996 | /* | |
997 | * An iommu master has an iommus property containing a list of phandles | |
998 | * to iommu nodes, each with an #iommu-cells property with value 0. | |
999 | */ | |
1000 | ret = of_count_phandle_with_args(np, "iommus", "#iommu-cells"); | |
1001 | return (ret > 0); | |
1002 | } | |
1003 | ||
1004 | static int rk_iommu_group_set_iommudata(struct iommu_group *group, | |
1005 | struct device *dev) | |
1006 | { | |
1007 | struct device_node *np = dev->of_node; | |
1008 | struct platform_device *pd; | |
1009 | int ret; | |
1010 | struct of_phandle_args args; | |
1011 | ||
1012 | /* | |
1013 | * An iommu master has an iommus property containing a list of phandles | |
1014 | * to iommu nodes, each with an #iommu-cells property with value 0. | |
1015 | */ | |
1016 | ret = of_parse_phandle_with_args(np, "iommus", "#iommu-cells", 0, | |
1017 | &args); | |
1018 | if (ret) { | |
6bd4f1c7 RH |
1019 | dev_err(dev, "of_parse_phandle_with_args(%pOF) => %d\n", |
1020 | np, ret); | |
c68a2921 DK |
1021 | return ret; |
1022 | } | |
1023 | if (args.args_count != 0) { | |
6bd4f1c7 RH |
1024 | dev_err(dev, "incorrect number of iommu params found for %pOF (found %d, expected 0)\n", |
1025 | args.np, args.args_count); | |
c68a2921 DK |
1026 | return -EINVAL; |
1027 | } | |
1028 | ||
1029 | pd = of_find_device_by_node(args.np); | |
1030 | of_node_put(args.np); | |
1031 | if (!pd) { | |
6bd4f1c7 | 1032 | dev_err(dev, "iommu %pOF not found\n", args.np); |
c68a2921 DK |
1033 | return -EPROBE_DEFER; |
1034 | } | |
1035 | ||
1036 | /* TODO(djkurtz): handle multiple slave iommus for a single master */ | |
1037 | iommu_group_set_iommudata(group, &pd->dev, NULL); | |
1038 | ||
1039 | return 0; | |
1040 | } | |
1041 | ||
1042 | static int rk_iommu_add_device(struct device *dev) | |
1043 | { | |
1044 | struct iommu_group *group; | |
c9d9f239 | 1045 | struct rk_iommu *iommu; |
c68a2921 DK |
1046 | int ret; |
1047 | ||
1048 | if (!rk_iommu_is_dev_iommu_master(dev)) | |
1049 | return -ENODEV; | |
1050 | ||
1051 | group = iommu_group_get(dev); | |
1052 | if (!group) { | |
1053 | group = iommu_group_alloc(); | |
1054 | if (IS_ERR(group)) { | |
1055 | dev_err(dev, "Failed to allocate IOMMU group\n"); | |
1056 | return PTR_ERR(group); | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | ret = iommu_group_add_device(group, dev); | |
1061 | if (ret) | |
1062 | goto err_put_group; | |
1063 | ||
1064 | ret = rk_iommu_group_set_iommudata(group, dev); | |
1065 | if (ret) | |
1066 | goto err_remove_device; | |
1067 | ||
c9d9f239 JR |
1068 | iommu = rk_iommu_from_dev(dev); |
1069 | if (iommu) | |
1070 | iommu_device_link(&iommu->iommu, dev); | |
1071 | ||
c68a2921 DK |
1072 | iommu_group_put(group); |
1073 | ||
1074 | return 0; | |
1075 | ||
1076 | err_remove_device: | |
1077 | iommu_group_remove_device(dev); | |
1078 | err_put_group: | |
1079 | iommu_group_put(group); | |
1080 | return ret; | |
1081 | } | |
1082 | ||
1083 | static void rk_iommu_remove_device(struct device *dev) | |
1084 | { | |
c9d9f239 JR |
1085 | struct rk_iommu *iommu; |
1086 | ||
c68a2921 DK |
1087 | if (!rk_iommu_is_dev_iommu_master(dev)) |
1088 | return; | |
1089 | ||
c9d9f239 JR |
1090 | iommu = rk_iommu_from_dev(dev); |
1091 | if (iommu) | |
1092 | iommu_device_unlink(&iommu->iommu, dev); | |
1093 | ||
c68a2921 DK |
1094 | iommu_group_remove_device(dev); |
1095 | } | |
1096 | ||
1097 | static const struct iommu_ops rk_iommu_ops = { | |
bcd516a3 JR |
1098 | .domain_alloc = rk_iommu_domain_alloc, |
1099 | .domain_free = rk_iommu_domain_free, | |
c68a2921 DK |
1100 | .attach_dev = rk_iommu_attach_device, |
1101 | .detach_dev = rk_iommu_detach_device, | |
1102 | .map = rk_iommu_map, | |
1103 | .unmap = rk_iommu_unmap, | |
e6d0f473 | 1104 | .map_sg = default_iommu_map_sg, |
c68a2921 DK |
1105 | .add_device = rk_iommu_add_device, |
1106 | .remove_device = rk_iommu_remove_device, | |
1107 | .iova_to_phys = rk_iommu_iova_to_phys, | |
1108 | .pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP, | |
1109 | }; | |
1110 | ||
4f0aba67 SZ |
1111 | static int rk_iommu_domain_probe(struct platform_device *pdev) |
1112 | { | |
1113 | struct device *dev = &pdev->dev; | |
1114 | ||
1115 | dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms), GFP_KERNEL); | |
1116 | if (!dev->dma_parms) | |
1117 | return -ENOMEM; | |
1118 | ||
1119 | /* Set dma_ops for dev, otherwise it would be dummy_dma_ops */ | |
1120 | arch_setup_dma_ops(dev, 0, DMA_BIT_MASK(32), NULL, false); | |
1121 | ||
1122 | dma_set_max_seg_size(dev, DMA_BIT_MASK(32)); | |
1123 | dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32)); | |
1124 | ||
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | static struct platform_driver rk_iommu_domain_driver = { | |
1129 | .probe = rk_iommu_domain_probe, | |
1130 | .driver = { | |
1131 | .name = "rk_iommu_domain", | |
1132 | }, | |
1133 | }; | |
1134 | ||
c68a2921 DK |
1135 | static int rk_iommu_probe(struct platform_device *pdev) |
1136 | { | |
1137 | struct device *dev = &pdev->dev; | |
1138 | struct rk_iommu *iommu; | |
1139 | struct resource *res; | |
3d08f434 | 1140 | int num_res = pdev->num_resources; |
c9d9f239 | 1141 | int err, i; |
c68a2921 DK |
1142 | |
1143 | iommu = devm_kzalloc(dev, sizeof(*iommu), GFP_KERNEL); | |
1144 | if (!iommu) | |
1145 | return -ENOMEM; | |
1146 | ||
1147 | platform_set_drvdata(pdev, iommu); | |
1148 | iommu->dev = dev; | |
cd6438c5 | 1149 | iommu->num_mmu = 0; |
3d08f434 SZ |
1150 | |
1151 | iommu->bases = devm_kzalloc(dev, sizeof(*iommu->bases) * num_res, | |
cd6438c5 Z |
1152 | GFP_KERNEL); |
1153 | if (!iommu->bases) | |
1154 | return -ENOMEM; | |
c68a2921 | 1155 | |
3d08f434 | 1156 | for (i = 0; i < num_res; i++) { |
cd6438c5 | 1157 | res = platform_get_resource(pdev, IORESOURCE_MEM, i); |
8d7f2d84 TV |
1158 | if (!res) |
1159 | continue; | |
cd6438c5 Z |
1160 | iommu->bases[i] = devm_ioremap_resource(&pdev->dev, res); |
1161 | if (IS_ERR(iommu->bases[i])) | |
1162 | continue; | |
1163 | iommu->num_mmu++; | |
1164 | } | |
1165 | if (iommu->num_mmu == 0) | |
1166 | return PTR_ERR(iommu->bases[0]); | |
c68a2921 | 1167 | |
03f732f8 SX |
1168 | iommu->num_irq = platform_irq_count(pdev); |
1169 | if (iommu->num_irq < 0) | |
1170 | return iommu->num_irq; | |
1171 | if (iommu->num_irq == 0) | |
c68a2921 | 1172 | return -ENXIO; |
03f732f8 SX |
1173 | |
1174 | iommu->irq = devm_kcalloc(dev, iommu->num_irq, sizeof(*iommu->irq), | |
1175 | GFP_KERNEL); | |
1176 | if (!iommu->irq) | |
1177 | return -ENOMEM; | |
1178 | ||
1179 | for (i = 0; i < iommu->num_irq; i++) { | |
1180 | iommu->irq[i] = platform_get_irq(pdev, i); | |
1181 | if (iommu->irq[i] < 0) { | |
1182 | dev_err(dev, "Failed to get IRQ, %d\n", iommu->irq[i]); | |
1183 | return -ENXIO; | |
1184 | } | |
c68a2921 DK |
1185 | } |
1186 | ||
c3aa4742 SX |
1187 | iommu->reset_disabled = device_property_read_bool(dev, |
1188 | "rockchip,disable-mmu-reset"); | |
1189 | ||
c9d9f239 JR |
1190 | err = iommu_device_sysfs_add(&iommu->iommu, dev, NULL, dev_name(dev)); |
1191 | if (err) | |
1192 | return err; | |
1193 | ||
1194 | iommu_device_set_ops(&iommu->iommu, &rk_iommu_ops); | |
1195 | err = iommu_device_register(&iommu->iommu); | |
6d9ffaad JC |
1196 | if (err) |
1197 | iommu_device_sysfs_remove(&iommu->iommu); | |
c9d9f239 JR |
1198 | |
1199 | return err; | |
c68a2921 DK |
1200 | } |
1201 | ||
1a4e90f2 MZ |
1202 | static void rk_iommu_shutdown(struct platform_device *pdev) |
1203 | { | |
1204 | struct rk_iommu *iommu = platform_get_drvdata(pdev); | |
1205 | ||
1206 | /* | |
1207 | * Be careful not to try to shutdown an otherwise unused | |
1208 | * IOMMU, as it is likely not to be clocked, and accessing it | |
1209 | * would just block. An IOMMU without a domain is likely to be | |
1210 | * unused, so let's use this as a (weak) guard. | |
1211 | */ | |
1212 | if (iommu && iommu->domain) { | |
1213 | rk_iommu_enable_stall(iommu); | |
1214 | rk_iommu_disable_paging(iommu); | |
1215 | rk_iommu_force_reset(iommu); | |
1216 | } | |
1217 | } | |
1218 | ||
c68a2921 DK |
1219 | static const struct of_device_id rk_iommu_dt_ids[] = { |
1220 | { .compatible = "rockchip,iommu" }, | |
1221 | { /* sentinel */ } | |
1222 | }; | |
1223 | MODULE_DEVICE_TABLE(of, rk_iommu_dt_ids); | |
c68a2921 DK |
1224 | |
1225 | static struct platform_driver rk_iommu_driver = { | |
1226 | .probe = rk_iommu_probe, | |
1a4e90f2 | 1227 | .shutdown = rk_iommu_shutdown, |
c68a2921 DK |
1228 | .driver = { |
1229 | .name = "rk_iommu", | |
d9e7eb15 | 1230 | .of_match_table = rk_iommu_dt_ids, |
98b72b94 | 1231 | .suppress_bind_attrs = true, |
c68a2921 DK |
1232 | }, |
1233 | }; | |
1234 | ||
1235 | static int __init rk_iommu_init(void) | |
1236 | { | |
425061b0 | 1237 | struct device_node *np; |
c68a2921 DK |
1238 | int ret; |
1239 | ||
425061b0 TR |
1240 | np = of_find_matching_node(NULL, rk_iommu_dt_ids); |
1241 | if (!np) | |
1242 | return 0; | |
1243 | ||
1244 | of_node_put(np); | |
1245 | ||
c68a2921 DK |
1246 | ret = bus_set_iommu(&platform_bus_type, &rk_iommu_ops); |
1247 | if (ret) | |
1248 | return ret; | |
1249 | ||
4f0aba67 SZ |
1250 | ret = platform_driver_register(&rk_iommu_domain_driver); |
1251 | if (ret) | |
1252 | return ret; | |
1253 | ||
1254 | ret = platform_driver_register(&rk_iommu_driver); | |
1255 | if (ret) | |
1256 | platform_driver_unregister(&rk_iommu_domain_driver); | |
1257 | return ret; | |
c68a2921 | 1258 | } |
c68a2921 | 1259 | subsys_initcall(rk_iommu_init); |
c68a2921 DK |
1260 | |
1261 | MODULE_DESCRIPTION("IOMMU API for Rockchip"); | |
1262 | MODULE_AUTHOR("Simon Xue <xxm@rock-chips.com> and Daniel Kurtz <djkurtz@chromium.org>"); | |
1263 | MODULE_ALIAS("platform:rockchip-iommu"); | |
1264 | MODULE_LICENSE("GPL v2"); |