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Laurent Pinchartd25a2a12014-04-02 12:47:37 +02001/*
2 * IPMMU VMSA
3 *
4 * Copyright (C) 2014 Renesas Electronics Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 */
10
11#include <linux/delay.h>
12#include <linux/dma-mapping.h>
13#include <linux/err.h>
14#include <linux/export.h>
15#include <linux/interrupt.h>
16#include <linux/io.h>
17#include <linux/iommu.h>
18#include <linux/module.h>
Laurent Pinchart275f5052014-03-17 01:02:46 +010019#include <linux/of.h>
Laurent Pinchartd25a2a12014-04-02 12:47:37 +020020#include <linux/platform_device.h>
21#include <linux/sizes.h>
22#include <linux/slab.h>
23
24#include <asm/dma-iommu.h>
25#include <asm/pgalloc.h>
26
Laurent Pinchartf20ed392015-01-20 18:30:04 +020027#include "io-pgtable.h"
28
Laurent Pinchartd25a2a12014-04-02 12:47:37 +020029struct ipmmu_vmsa_device {
30 struct device *dev;
31 void __iomem *base;
32 struct list_head list;
33
Laurent Pinchartd25a2a12014-04-02 12:47:37 +020034 unsigned int num_utlbs;
35
36 struct dma_iommu_mapping *mapping;
37};
38
39struct ipmmu_vmsa_domain {
40 struct ipmmu_vmsa_device *mmu;
Joerg Roedel5914c5f2015-03-26 13:43:16 +010041 struct iommu_domain io_domain;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +020042
Laurent Pinchartf20ed392015-01-20 18:30:04 +020043 struct io_pgtable_cfg cfg;
44 struct io_pgtable_ops *iop;
45
Laurent Pinchartd25a2a12014-04-02 12:47:37 +020046 unsigned int context_id;
47 spinlock_t lock; /* Protects mappings */
Laurent Pinchartd25a2a12014-04-02 12:47:37 +020048};
49
Laurent Pinchart192d2042014-05-15 12:40:42 +020050struct ipmmu_vmsa_archdata {
51 struct ipmmu_vmsa_device *mmu;
Laurent Pincharta166d312014-07-24 01:36:43 +020052 unsigned int *utlbs;
53 unsigned int num_utlbs;
Laurent Pinchart192d2042014-05-15 12:40:42 +020054};
55
Laurent Pinchartd25a2a12014-04-02 12:47:37 +020056static DEFINE_SPINLOCK(ipmmu_devices_lock);
57static LIST_HEAD(ipmmu_devices);
58
Joerg Roedel5914c5f2015-03-26 13:43:16 +010059static struct ipmmu_vmsa_domain *to_vmsa_domain(struct iommu_domain *dom)
60{
61 return container_of(dom, struct ipmmu_vmsa_domain, io_domain);
62}
63
Laurent Pinchartd25a2a12014-04-02 12:47:37 +020064#define TLB_LOOP_TIMEOUT 100 /* 100us */
65
66/* -----------------------------------------------------------------------------
67 * Registers Definition
68 */
69
Laurent Pinchart275f5052014-03-17 01:02:46 +010070#define IM_NS_ALIAS_OFFSET 0x800
71
Laurent Pinchartd25a2a12014-04-02 12:47:37 +020072#define IM_CTX_SIZE 0x40
73
74#define IMCTR 0x0000
75#define IMCTR_TRE (1 << 17)
76#define IMCTR_AFE (1 << 16)
77#define IMCTR_RTSEL_MASK (3 << 4)
78#define IMCTR_RTSEL_SHIFT 4
79#define IMCTR_TREN (1 << 3)
80#define IMCTR_INTEN (1 << 2)
81#define IMCTR_FLUSH (1 << 1)
82#define IMCTR_MMUEN (1 << 0)
83
84#define IMCAAR 0x0004
85
86#define IMTTBCR 0x0008
87#define IMTTBCR_EAE (1 << 31)
88#define IMTTBCR_PMB (1 << 30)
89#define IMTTBCR_SH1_NON_SHAREABLE (0 << 28)
90#define IMTTBCR_SH1_OUTER_SHAREABLE (2 << 28)
91#define IMTTBCR_SH1_INNER_SHAREABLE (3 << 28)
92#define IMTTBCR_SH1_MASK (3 << 28)
93#define IMTTBCR_ORGN1_NC (0 << 26)
94#define IMTTBCR_ORGN1_WB_WA (1 << 26)
95#define IMTTBCR_ORGN1_WT (2 << 26)
96#define IMTTBCR_ORGN1_WB (3 << 26)
97#define IMTTBCR_ORGN1_MASK (3 << 26)
98#define IMTTBCR_IRGN1_NC (0 << 24)
99#define IMTTBCR_IRGN1_WB_WA (1 << 24)
100#define IMTTBCR_IRGN1_WT (2 << 24)
101#define IMTTBCR_IRGN1_WB (3 << 24)
102#define IMTTBCR_IRGN1_MASK (3 << 24)
103#define IMTTBCR_TSZ1_MASK (7 << 16)
104#define IMTTBCR_TSZ1_SHIFT 16
105#define IMTTBCR_SH0_NON_SHAREABLE (0 << 12)
106#define IMTTBCR_SH0_OUTER_SHAREABLE (2 << 12)
107#define IMTTBCR_SH0_INNER_SHAREABLE (3 << 12)
108#define IMTTBCR_SH0_MASK (3 << 12)
109#define IMTTBCR_ORGN0_NC (0 << 10)
110#define IMTTBCR_ORGN0_WB_WA (1 << 10)
111#define IMTTBCR_ORGN0_WT (2 << 10)
112#define IMTTBCR_ORGN0_WB (3 << 10)
113#define IMTTBCR_ORGN0_MASK (3 << 10)
114#define IMTTBCR_IRGN0_NC (0 << 8)
115#define IMTTBCR_IRGN0_WB_WA (1 << 8)
116#define IMTTBCR_IRGN0_WT (2 << 8)
117#define IMTTBCR_IRGN0_WB (3 << 8)
118#define IMTTBCR_IRGN0_MASK (3 << 8)
119#define IMTTBCR_SL0_LVL_2 (0 << 4)
120#define IMTTBCR_SL0_LVL_1 (1 << 4)
121#define IMTTBCR_TSZ0_MASK (7 << 0)
122#define IMTTBCR_TSZ0_SHIFT O
123
124#define IMBUSCR 0x000c
125#define IMBUSCR_DVM (1 << 2)
126#define IMBUSCR_BUSSEL_SYS (0 << 0)
127#define IMBUSCR_BUSSEL_CCI (1 << 0)
128#define IMBUSCR_BUSSEL_IMCAAR (2 << 0)
129#define IMBUSCR_BUSSEL_CCI_IMCAAR (3 << 0)
130#define IMBUSCR_BUSSEL_MASK (3 << 0)
131
132#define IMTTLBR0 0x0010
133#define IMTTUBR0 0x0014
134#define IMTTLBR1 0x0018
135#define IMTTUBR1 0x001c
136
137#define IMSTR 0x0020
138#define IMSTR_ERRLVL_MASK (3 << 12)
139#define IMSTR_ERRLVL_SHIFT 12
140#define IMSTR_ERRCODE_TLB_FORMAT (1 << 8)
141#define IMSTR_ERRCODE_ACCESS_PERM (4 << 8)
142#define IMSTR_ERRCODE_SECURE_ACCESS (5 << 8)
143#define IMSTR_ERRCODE_MASK (7 << 8)
144#define IMSTR_MHIT (1 << 4)
145#define IMSTR_ABORT (1 << 2)
146#define IMSTR_PF (1 << 1)
147#define IMSTR_TF (1 << 0)
148
149#define IMMAIR0 0x0028
150#define IMMAIR1 0x002c
151#define IMMAIR_ATTR_MASK 0xff
152#define IMMAIR_ATTR_DEVICE 0x04
153#define IMMAIR_ATTR_NC 0x44
154#define IMMAIR_ATTR_WBRWA 0xff
155#define IMMAIR_ATTR_SHIFT(n) ((n) << 3)
156#define IMMAIR_ATTR_IDX_NC 0
157#define IMMAIR_ATTR_IDX_WBRWA 1
158#define IMMAIR_ATTR_IDX_DEV 2
159
160#define IMEAR 0x0030
161
162#define IMPCTR 0x0200
163#define IMPSTR 0x0208
164#define IMPEAR 0x020c
165#define IMPMBA(n) (0x0280 + ((n) * 4))
166#define IMPMBD(n) (0x02c0 + ((n) * 4))
167
168#define IMUCTR(n) (0x0300 + ((n) * 16))
169#define IMUCTR_FIXADDEN (1 << 31)
170#define IMUCTR_FIXADD_MASK (0xff << 16)
171#define IMUCTR_FIXADD_SHIFT 16
172#define IMUCTR_TTSEL_MMU(n) ((n) << 4)
173#define IMUCTR_TTSEL_PMB (8 << 4)
174#define IMUCTR_TTSEL_MASK (15 << 4)
175#define IMUCTR_FLUSH (1 << 1)
176#define IMUCTR_MMUEN (1 << 0)
177
178#define IMUASID(n) (0x0308 + ((n) * 16))
179#define IMUASID_ASID8_MASK (0xff << 8)
180#define IMUASID_ASID8_SHIFT 8
181#define IMUASID_ASID0_MASK (0xff << 0)
182#define IMUASID_ASID0_SHIFT 0
183
184/* -----------------------------------------------------------------------------
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200185 * Read/Write Access
186 */
187
188static u32 ipmmu_read(struct ipmmu_vmsa_device *mmu, unsigned int offset)
189{
190 return ioread32(mmu->base + offset);
191}
192
193static void ipmmu_write(struct ipmmu_vmsa_device *mmu, unsigned int offset,
194 u32 data)
195{
196 iowrite32(data, mmu->base + offset);
197}
198
199static u32 ipmmu_ctx_read(struct ipmmu_vmsa_domain *domain, unsigned int reg)
200{
201 return ipmmu_read(domain->mmu, domain->context_id * IM_CTX_SIZE + reg);
202}
203
204static void ipmmu_ctx_write(struct ipmmu_vmsa_domain *domain, unsigned int reg,
205 u32 data)
206{
207 ipmmu_write(domain->mmu, domain->context_id * IM_CTX_SIZE + reg, data);
208}
209
210/* -----------------------------------------------------------------------------
211 * TLB and microTLB Management
212 */
213
214/* Wait for any pending TLB invalidations to complete */
215static void ipmmu_tlb_sync(struct ipmmu_vmsa_domain *domain)
216{
217 unsigned int count = 0;
218
219 while (ipmmu_ctx_read(domain, IMCTR) & IMCTR_FLUSH) {
220 cpu_relax();
221 if (++count == TLB_LOOP_TIMEOUT) {
222 dev_err_ratelimited(domain->mmu->dev,
223 "TLB sync timed out -- MMU may be deadlocked\n");
224 return;
225 }
226 udelay(1);
227 }
228}
229
230static void ipmmu_tlb_invalidate(struct ipmmu_vmsa_domain *domain)
231{
232 u32 reg;
233
234 reg = ipmmu_ctx_read(domain, IMCTR);
235 reg |= IMCTR_FLUSH;
236 ipmmu_ctx_write(domain, IMCTR, reg);
237
238 ipmmu_tlb_sync(domain);
239}
240
241/*
242 * Enable MMU translation for the microTLB.
243 */
244static void ipmmu_utlb_enable(struct ipmmu_vmsa_domain *domain,
Laurent Pinchart192d2042014-05-15 12:40:42 +0200245 unsigned int utlb)
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200246{
247 struct ipmmu_vmsa_device *mmu = domain->mmu;
248
Laurent Pinchart192d2042014-05-15 12:40:42 +0200249 /*
250 * TODO: Reference-count the microTLB as several bus masters can be
251 * connected to the same microTLB.
252 */
253
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200254 /* TODO: What should we set the ASID to ? */
Laurent Pinchart192d2042014-05-15 12:40:42 +0200255 ipmmu_write(mmu, IMUASID(utlb), 0);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200256 /* TODO: Do we need to flush the microTLB ? */
Laurent Pinchart192d2042014-05-15 12:40:42 +0200257 ipmmu_write(mmu, IMUCTR(utlb),
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200258 IMUCTR_TTSEL_MMU(domain->context_id) | IMUCTR_FLUSH |
259 IMUCTR_MMUEN);
260}
261
262/*
263 * Disable MMU translation for the microTLB.
264 */
265static void ipmmu_utlb_disable(struct ipmmu_vmsa_domain *domain,
Laurent Pinchart192d2042014-05-15 12:40:42 +0200266 unsigned int utlb)
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200267{
268 struct ipmmu_vmsa_device *mmu = domain->mmu;
269
Laurent Pinchart192d2042014-05-15 12:40:42 +0200270 ipmmu_write(mmu, IMUCTR(utlb), 0);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200271}
272
Laurent Pinchartf20ed392015-01-20 18:30:04 +0200273static void ipmmu_tlb_flush_all(void *cookie)
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200274{
Laurent Pinchartf20ed392015-01-20 18:30:04 +0200275 struct ipmmu_vmsa_domain *domain = cookie;
276
277 ipmmu_tlb_invalidate(domain);
278}
279
280static void ipmmu_tlb_add_flush(unsigned long iova, size_t size, bool leaf,
281 void *cookie)
282{
283 /* The hardware doesn't support selective TLB flush. */
284}
285
286static void ipmmu_flush_pgtable(void *ptr, size_t size, void *cookie)
287{
288 unsigned long offset = (unsigned long)ptr & ~PAGE_MASK;
289 struct ipmmu_vmsa_domain *domain = cookie;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200290
291 /*
292 * TODO: Add support for coherent walk through CCI with DVM and remove
293 * cache handling.
294 */
Laurent Pinchartf20ed392015-01-20 18:30:04 +0200295 dma_map_page(domain->mmu->dev, virt_to_page(ptr), offset, size,
296 DMA_TO_DEVICE);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200297}
298
Laurent Pinchartf20ed392015-01-20 18:30:04 +0200299static struct iommu_gather_ops ipmmu_gather_ops = {
300 .tlb_flush_all = ipmmu_tlb_flush_all,
301 .tlb_add_flush = ipmmu_tlb_add_flush,
302 .tlb_sync = ipmmu_tlb_flush_all,
303 .flush_pgtable = ipmmu_flush_pgtable,
304};
305
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200306/* -----------------------------------------------------------------------------
307 * Domain/Context Management
308 */
309
310static int ipmmu_domain_init_context(struct ipmmu_vmsa_domain *domain)
311{
312 phys_addr_t ttbr;
Laurent Pinchartf20ed392015-01-20 18:30:04 +0200313
314 /*
315 * Allocate the page table operations.
316 *
317 * VMSA states in section B3.6.3 "Control of Secure or Non-secure memory
318 * access, Long-descriptor format" that the NStable bit being set in a
319 * table descriptor will result in the NStable and NS bits of all child
320 * entries being ignored and considered as being set. The IPMMU seems
321 * not to comply with this, as it generates a secure access page fault
322 * if any of the NStable and NS bits isn't set when running in
323 * non-secure mode.
324 */
325 domain->cfg.quirks = IO_PGTABLE_QUIRK_ARM_NS;
326 domain->cfg.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
327 domain->cfg.ias = 32;
328 domain->cfg.oas = 40;
329 domain->cfg.tlb = &ipmmu_gather_ops;
330
331 domain->iop = alloc_io_pgtable_ops(ARM_32_LPAE_S1, &domain->cfg,
332 domain);
333 if (!domain->iop)
334 return -EINVAL;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200335
336 /*
337 * TODO: When adding support for multiple contexts, find an unused
338 * context.
339 */
340 domain->context_id = 0;
341
342 /* TTBR0 */
Laurent Pinchartf20ed392015-01-20 18:30:04 +0200343 ttbr = domain->cfg.arm_lpae_s1_cfg.ttbr[0];
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200344 ipmmu_ctx_write(domain, IMTTLBR0, ttbr);
345 ipmmu_ctx_write(domain, IMTTUBR0, ttbr >> 32);
346
347 /*
348 * TTBCR
349 * We use long descriptors with inner-shareable WBWA tables and allocate
350 * the whole 32-bit VA space to TTBR0.
351 */
352 ipmmu_ctx_write(domain, IMTTBCR, IMTTBCR_EAE |
353 IMTTBCR_SH0_INNER_SHAREABLE | IMTTBCR_ORGN0_WB_WA |
354 IMTTBCR_IRGN0_WB_WA | IMTTBCR_SL0_LVL_1);
355
Laurent Pinchartf20ed392015-01-20 18:30:04 +0200356 /* MAIR0 */
357 ipmmu_ctx_write(domain, IMMAIR0, domain->cfg.arm_lpae_s1_cfg.mair[0]);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200358
359 /* IMBUSCR */
360 ipmmu_ctx_write(domain, IMBUSCR,
361 ipmmu_ctx_read(domain, IMBUSCR) &
362 ~(IMBUSCR_DVM | IMBUSCR_BUSSEL_MASK));
363
364 /*
365 * IMSTR
366 * Clear all interrupt flags.
367 */
368 ipmmu_ctx_write(domain, IMSTR, ipmmu_ctx_read(domain, IMSTR));
369
370 /*
371 * IMCTR
372 * Enable the MMU and interrupt generation. The long-descriptor
373 * translation table format doesn't use TEX remapping. Don't enable AF
374 * software management as we have no use for it. Flush the TLB as
375 * required when modifying the context registers.
376 */
377 ipmmu_ctx_write(domain, IMCTR, IMCTR_INTEN | IMCTR_FLUSH | IMCTR_MMUEN);
378
379 return 0;
380}
381
382static void ipmmu_domain_destroy_context(struct ipmmu_vmsa_domain *domain)
383{
384 /*
385 * Disable the context. Flush the TLB as required when modifying the
386 * context registers.
387 *
388 * TODO: Is TLB flush really needed ?
389 */
390 ipmmu_ctx_write(domain, IMCTR, IMCTR_FLUSH);
391 ipmmu_tlb_sync(domain);
392}
393
394/* -----------------------------------------------------------------------------
395 * Fault Handling
396 */
397
398static irqreturn_t ipmmu_domain_irq(struct ipmmu_vmsa_domain *domain)
399{
400 const u32 err_mask = IMSTR_MHIT | IMSTR_ABORT | IMSTR_PF | IMSTR_TF;
401 struct ipmmu_vmsa_device *mmu = domain->mmu;
402 u32 status;
403 u32 iova;
404
405 status = ipmmu_ctx_read(domain, IMSTR);
406 if (!(status & err_mask))
407 return IRQ_NONE;
408
409 iova = ipmmu_ctx_read(domain, IMEAR);
410
411 /*
412 * Clear the error status flags. Unlike traditional interrupt flag
413 * registers that must be cleared by writing 1, this status register
414 * seems to require 0. The error address register must be read before,
415 * otherwise its value will be 0.
416 */
417 ipmmu_ctx_write(domain, IMSTR, 0);
418
419 /* Log fatal errors. */
420 if (status & IMSTR_MHIT)
421 dev_err_ratelimited(mmu->dev, "Multiple TLB hits @0x%08x\n",
422 iova);
423 if (status & IMSTR_ABORT)
424 dev_err_ratelimited(mmu->dev, "Page Table Walk Abort @0x%08x\n",
425 iova);
426
427 if (!(status & (IMSTR_PF | IMSTR_TF)))
428 return IRQ_NONE;
429
430 /*
431 * Try to handle page faults and translation faults.
432 *
433 * TODO: We need to look up the faulty device based on the I/O VA. Use
434 * the IOMMU device for now.
435 */
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100436 if (!report_iommu_fault(&domain->io_domain, mmu->dev, iova, 0))
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200437 return IRQ_HANDLED;
438
439 dev_err_ratelimited(mmu->dev,
440 "Unhandled fault: status 0x%08x iova 0x%08x\n",
441 status, iova);
442
443 return IRQ_HANDLED;
444}
445
446static irqreturn_t ipmmu_irq(int irq, void *dev)
447{
448 struct ipmmu_vmsa_device *mmu = dev;
449 struct iommu_domain *io_domain;
450 struct ipmmu_vmsa_domain *domain;
451
452 if (!mmu->mapping)
453 return IRQ_NONE;
454
455 io_domain = mmu->mapping->domain;
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100456 domain = to_vmsa_domain(io_domain);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200457
458 return ipmmu_domain_irq(domain);
459}
460
461/* -----------------------------------------------------------------------------
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200462 * IOMMU Operations
463 */
464
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100465static struct iommu_domain *ipmmu_domain_alloc(unsigned type)
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200466{
467 struct ipmmu_vmsa_domain *domain;
468
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100469 if (type != IOMMU_DOMAIN_UNMANAGED)
470 return NULL;
471
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200472 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
473 if (!domain)
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100474 return NULL;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200475
476 spin_lock_init(&domain->lock);
477
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100478 return &domain->io_domain;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200479}
480
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100481static void ipmmu_domain_free(struct iommu_domain *io_domain)
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200482{
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100483 struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200484
485 /*
486 * Free the domain resources. We assume that all devices have already
487 * been detached.
488 */
489 ipmmu_domain_destroy_context(domain);
Laurent Pinchartf20ed392015-01-20 18:30:04 +0200490 free_io_pgtable_ops(domain->iop);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200491 kfree(domain);
492}
493
494static int ipmmu_attach_device(struct iommu_domain *io_domain,
495 struct device *dev)
496{
Laurent Pinchart192d2042014-05-15 12:40:42 +0200497 struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
498 struct ipmmu_vmsa_device *mmu = archdata->mmu;
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100499 struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200500 unsigned long flags;
Laurent Pincharta166d312014-07-24 01:36:43 +0200501 unsigned int i;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200502 int ret = 0;
503
504 if (!mmu) {
505 dev_err(dev, "Cannot attach to IPMMU\n");
506 return -ENXIO;
507 }
508
509 spin_lock_irqsave(&domain->lock, flags);
510
511 if (!domain->mmu) {
512 /* The domain hasn't been used yet, initialize it. */
513 domain->mmu = mmu;
514 ret = ipmmu_domain_init_context(domain);
515 } else if (domain->mmu != mmu) {
516 /*
517 * Something is wrong, we can't attach two devices using
518 * different IOMMUs to the same domain.
519 */
520 dev_err(dev, "Can't attach IPMMU %s to domain on IPMMU %s\n",
521 dev_name(mmu->dev), dev_name(domain->mmu->dev));
522 ret = -EINVAL;
523 }
524
525 spin_unlock_irqrestore(&domain->lock, flags);
526
527 if (ret < 0)
528 return ret;
529
Laurent Pincharta166d312014-07-24 01:36:43 +0200530 for (i = 0; i < archdata->num_utlbs; ++i)
531 ipmmu_utlb_enable(domain, archdata->utlbs[i]);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200532
533 return 0;
534}
535
536static void ipmmu_detach_device(struct iommu_domain *io_domain,
537 struct device *dev)
538{
Laurent Pinchart192d2042014-05-15 12:40:42 +0200539 struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100540 struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
Laurent Pincharta166d312014-07-24 01:36:43 +0200541 unsigned int i;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200542
Laurent Pincharta166d312014-07-24 01:36:43 +0200543 for (i = 0; i < archdata->num_utlbs; ++i)
544 ipmmu_utlb_disable(domain, archdata->utlbs[i]);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200545
546 /*
547 * TODO: Optimize by disabling the context when no device is attached.
548 */
549}
550
551static int ipmmu_map(struct iommu_domain *io_domain, unsigned long iova,
552 phys_addr_t paddr, size_t size, int prot)
553{
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100554 struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200555
556 if (!domain)
557 return -ENODEV;
558
Laurent Pinchartf20ed392015-01-20 18:30:04 +0200559 return domain->iop->map(domain->iop, iova, paddr, size, prot);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200560}
561
562static size_t ipmmu_unmap(struct iommu_domain *io_domain, unsigned long iova,
563 size_t size)
564{
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100565 struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200566
Laurent Pinchartf20ed392015-01-20 18:30:04 +0200567 return domain->iop->unmap(domain->iop, iova, size);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200568}
569
570static phys_addr_t ipmmu_iova_to_phys(struct iommu_domain *io_domain,
571 dma_addr_t iova)
572{
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100573 struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200574
575 /* TODO: Is locking needed ? */
576
Laurent Pinchartf20ed392015-01-20 18:30:04 +0200577 return domain->iop->iova_to_phys(domain->iop, iova);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200578}
579
Laurent Pincharta166d312014-07-24 01:36:43 +0200580static int ipmmu_find_utlbs(struct ipmmu_vmsa_device *mmu, struct device *dev,
Laurent Pinchartbb590c92015-01-24 23:13:50 +0200581 unsigned int *utlbs, unsigned int num_utlbs)
Laurent Pinchart192d2042014-05-15 12:40:42 +0200582{
Laurent Pincharta166d312014-07-24 01:36:43 +0200583 unsigned int i;
Laurent Pinchart192d2042014-05-15 12:40:42 +0200584
Laurent Pinchartbb590c92015-01-24 23:13:50 +0200585 for (i = 0; i < num_utlbs; ++i) {
Laurent Pincharta166d312014-07-24 01:36:43 +0200586 struct of_phandle_args args;
587 int ret;
Laurent Pinchart275f5052014-03-17 01:02:46 +0100588
Laurent Pincharta166d312014-07-24 01:36:43 +0200589 ret = of_parse_phandle_with_args(dev->of_node, "iommus",
590 "#iommu-cells", i, &args);
591 if (ret < 0)
Laurent Pinchartbb590c92015-01-24 23:13:50 +0200592 return ret;
Laurent Pincharta166d312014-07-24 01:36:43 +0200593
594 of_node_put(args.np);
595
596 if (args.np != mmu->dev->of_node || args.args_count != 1)
Laurent Pinchartbb590c92015-01-24 23:13:50 +0200597 return -EINVAL;
Laurent Pincharta166d312014-07-24 01:36:43 +0200598
599 utlbs[i] = args.args[0];
600 }
601
Laurent Pinchartbb590c92015-01-24 23:13:50 +0200602 return 0;
Laurent Pinchart192d2042014-05-15 12:40:42 +0200603}
604
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200605static int ipmmu_add_device(struct device *dev)
606{
Laurent Pinchart192d2042014-05-15 12:40:42 +0200607 struct ipmmu_vmsa_archdata *archdata;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200608 struct ipmmu_vmsa_device *mmu;
Laurent Pincharta166d312014-07-24 01:36:43 +0200609 struct iommu_group *group = NULL;
Laurent Pinchartbb590c92015-01-24 23:13:50 +0200610 unsigned int *utlbs;
Laurent Pincharta166d312014-07-24 01:36:43 +0200611 unsigned int i;
Laurent Pinchartbb590c92015-01-24 23:13:50 +0200612 int num_utlbs;
613 int ret = -ENODEV;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200614
615 if (dev->archdata.iommu) {
616 dev_warn(dev, "IOMMU driver already assigned to device %s\n",
617 dev_name(dev));
618 return -EINVAL;
619 }
620
621 /* Find the master corresponding to the device. */
Laurent Pinchartbb590c92015-01-24 23:13:50 +0200622
623 num_utlbs = of_count_phandle_with_args(dev->of_node, "iommus",
624 "#iommu-cells");
625 if (num_utlbs < 0)
626 return -ENODEV;
627
628 utlbs = kcalloc(num_utlbs, sizeof(*utlbs), GFP_KERNEL);
629 if (!utlbs)
630 return -ENOMEM;
631
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200632 spin_lock(&ipmmu_devices_lock);
633
634 list_for_each_entry(mmu, &ipmmu_devices, list) {
Laurent Pinchartbb590c92015-01-24 23:13:50 +0200635 ret = ipmmu_find_utlbs(mmu, dev, utlbs, num_utlbs);
636 if (!ret) {
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200637 /*
Laurent Pinchart192d2042014-05-15 12:40:42 +0200638 * TODO Take a reference to the MMU to protect
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200639 * against device removal.
640 */
641 break;
642 }
643 }
644
645 spin_unlock(&ipmmu_devices_lock);
646
Laurent Pinchartbb590c92015-01-24 23:13:50 +0200647 if (ret < 0)
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200648 return -ENODEV;
649
Laurent Pincharta166d312014-07-24 01:36:43 +0200650 for (i = 0; i < num_utlbs; ++i) {
651 if (utlbs[i] >= mmu->num_utlbs) {
652 ret = -EINVAL;
653 goto error;
654 }
655 }
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200656
657 /* Create a device group and add the device to it. */
658 group = iommu_group_alloc();
659 if (IS_ERR(group)) {
660 dev_err(dev, "Failed to allocate IOMMU group\n");
Laurent Pincharta166d312014-07-24 01:36:43 +0200661 ret = PTR_ERR(group);
662 goto error;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200663 }
664
665 ret = iommu_group_add_device(group, dev);
666 iommu_group_put(group);
667
668 if (ret < 0) {
669 dev_err(dev, "Failed to add device to IPMMU group\n");
Laurent Pincharta166d312014-07-24 01:36:43 +0200670 group = NULL;
671 goto error;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200672 }
673
Laurent Pinchart192d2042014-05-15 12:40:42 +0200674 archdata = kzalloc(sizeof(*archdata), GFP_KERNEL);
675 if (!archdata) {
676 ret = -ENOMEM;
677 goto error;
678 }
679
680 archdata->mmu = mmu;
Laurent Pincharta166d312014-07-24 01:36:43 +0200681 archdata->utlbs = utlbs;
682 archdata->num_utlbs = num_utlbs;
Laurent Pinchart192d2042014-05-15 12:40:42 +0200683 dev->archdata.iommu = archdata;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200684
685 /*
686 * Create the ARM mapping, used by the ARM DMA mapping core to allocate
687 * VAs. This will allocate a corresponding IOMMU domain.
688 *
689 * TODO:
690 * - Create one mapping per context (TLB).
691 * - Make the mapping size configurable ? We currently use a 2GB mapping
692 * at a 1GB offset to ensure that NULL VAs will fault.
693 */
694 if (!mmu->mapping) {
695 struct dma_iommu_mapping *mapping;
696
697 mapping = arm_iommu_create_mapping(&platform_bus_type,
Joerg Roedel720b0ce2014-05-26 13:07:01 +0200698 SZ_1G, SZ_2G);
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200699 if (IS_ERR(mapping)) {
700 dev_err(mmu->dev, "failed to create ARM IOMMU mapping\n");
Laurent Pinchartb8f80bf2014-03-14 14:00:56 +0100701 ret = PTR_ERR(mapping);
702 goto error;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200703 }
704
705 mmu->mapping = mapping;
706 }
707
708 /* Attach the ARM VA mapping to the device. */
709 ret = arm_iommu_attach_device(dev, mmu->mapping);
710 if (ret < 0) {
711 dev_err(dev, "Failed to attach device to VA mapping\n");
712 goto error;
713 }
714
715 return 0;
716
717error:
Laurent Pinchartb8f80bf2014-03-14 14:00:56 +0100718 arm_iommu_release_mapping(mmu->mapping);
Laurent Pincharta166d312014-07-24 01:36:43 +0200719
Laurent Pinchart192d2042014-05-15 12:40:42 +0200720 kfree(dev->archdata.iommu);
Laurent Pincharta166d312014-07-24 01:36:43 +0200721 kfree(utlbs);
722
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200723 dev->archdata.iommu = NULL;
Laurent Pincharta166d312014-07-24 01:36:43 +0200724
725 if (!IS_ERR_OR_NULL(group))
726 iommu_group_remove_device(dev);
727
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200728 return ret;
729}
730
731static void ipmmu_remove_device(struct device *dev)
732{
Laurent Pincharta166d312014-07-24 01:36:43 +0200733 struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
734
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200735 arm_iommu_detach_device(dev);
736 iommu_group_remove_device(dev);
Laurent Pincharta166d312014-07-24 01:36:43 +0200737
738 kfree(archdata->utlbs);
739 kfree(archdata);
740
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200741 dev->archdata.iommu = NULL;
742}
743
Thierry Redingb22f6432014-06-27 09:03:12 +0200744static const struct iommu_ops ipmmu_ops = {
Joerg Roedel5914c5f2015-03-26 13:43:16 +0100745 .domain_alloc = ipmmu_domain_alloc,
746 .domain_free = ipmmu_domain_free,
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200747 .attach_dev = ipmmu_attach_device,
748 .detach_dev = ipmmu_detach_device,
749 .map = ipmmu_map,
750 .unmap = ipmmu_unmap,
Olav Haugan315786e2014-10-25 09:55:16 -0700751 .map_sg = default_iommu_map_sg,
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200752 .iova_to_phys = ipmmu_iova_to_phys,
753 .add_device = ipmmu_add_device,
754 .remove_device = ipmmu_remove_device,
Laurent Pinchartf20ed392015-01-20 18:30:04 +0200755 .pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200756};
757
758/* -----------------------------------------------------------------------------
759 * Probe/remove and init
760 */
761
762static void ipmmu_device_reset(struct ipmmu_vmsa_device *mmu)
763{
764 unsigned int i;
765
766 /* Disable all contexts. */
767 for (i = 0; i < 4; ++i)
768 ipmmu_write(mmu, i * IM_CTX_SIZE + IMCTR, 0);
769}
770
771static int ipmmu_probe(struct platform_device *pdev)
772{
773 struct ipmmu_vmsa_device *mmu;
774 struct resource *res;
775 int irq;
776 int ret;
777
Laurent Pinchart275f5052014-03-17 01:02:46 +0100778 if (!IS_ENABLED(CONFIG_OF) && !pdev->dev.platform_data) {
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200779 dev_err(&pdev->dev, "missing platform data\n");
780 return -EINVAL;
781 }
782
783 mmu = devm_kzalloc(&pdev->dev, sizeof(*mmu), GFP_KERNEL);
784 if (!mmu) {
785 dev_err(&pdev->dev, "cannot allocate device data\n");
786 return -ENOMEM;
787 }
788
789 mmu->dev = &pdev->dev;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200790 mmu->num_utlbs = 32;
791
792 /* Map I/O memory and request IRQ. */
793 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
794 mmu->base = devm_ioremap_resource(&pdev->dev, res);
795 if (IS_ERR(mmu->base))
796 return PTR_ERR(mmu->base);
797
Laurent Pinchart275f5052014-03-17 01:02:46 +0100798 /*
799 * The IPMMU has two register banks, for secure and non-secure modes.
800 * The bank mapped at the beginning of the IPMMU address space
801 * corresponds to the running mode of the CPU. When running in secure
802 * mode the non-secure register bank is also available at an offset.
803 *
804 * Secure mode operation isn't clearly documented and is thus currently
805 * not implemented in the driver. Furthermore, preliminary tests of
806 * non-secure operation with the main register bank were not successful.
807 * Offset the registers base unconditionally to point to the non-secure
808 * alias space for now.
809 */
810 mmu->base += IM_NS_ALIAS_OFFSET;
811
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200812 irq = platform_get_irq(pdev, 0);
813 if (irq < 0) {
814 dev_err(&pdev->dev, "no IRQ found\n");
815 return irq;
816 }
817
818 ret = devm_request_irq(&pdev->dev, irq, ipmmu_irq, 0,
819 dev_name(&pdev->dev), mmu);
820 if (ret < 0) {
821 dev_err(&pdev->dev, "failed to request IRQ %d\n", irq);
Axel Line222d6a2014-11-01 11:45:32 +0800822 return ret;
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200823 }
824
825 ipmmu_device_reset(mmu);
826
827 /*
828 * We can't create the ARM mapping here as it requires the bus to have
829 * an IOMMU, which only happens when bus_set_iommu() is called in
830 * ipmmu_init() after the probe function returns.
831 */
832
833 spin_lock(&ipmmu_devices_lock);
834 list_add(&mmu->list, &ipmmu_devices);
835 spin_unlock(&ipmmu_devices_lock);
836
837 platform_set_drvdata(pdev, mmu);
838
839 return 0;
840}
841
842static int ipmmu_remove(struct platform_device *pdev)
843{
844 struct ipmmu_vmsa_device *mmu = platform_get_drvdata(pdev);
845
846 spin_lock(&ipmmu_devices_lock);
847 list_del(&mmu->list);
848 spin_unlock(&ipmmu_devices_lock);
849
850 arm_iommu_release_mapping(mmu->mapping);
851
852 ipmmu_device_reset(mmu);
853
854 return 0;
855}
856
Laurent Pinchart275f5052014-03-17 01:02:46 +0100857static const struct of_device_id ipmmu_of_ids[] = {
858 { .compatible = "renesas,ipmmu-vmsa", },
Axel Linac04f852015-03-17 08:06:45 +0800859 { }
Laurent Pinchart275f5052014-03-17 01:02:46 +0100860};
861
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200862static struct platform_driver ipmmu_driver = {
863 .driver = {
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200864 .name = "ipmmu-vmsa",
Laurent Pinchart275f5052014-03-17 01:02:46 +0100865 .of_match_table = of_match_ptr(ipmmu_of_ids),
Laurent Pinchartd25a2a12014-04-02 12:47:37 +0200866 },
867 .probe = ipmmu_probe,
868 .remove = ipmmu_remove,
869};
870
871static int __init ipmmu_init(void)
872{
873 int ret;
874
875 ret = platform_driver_register(&ipmmu_driver);
876 if (ret < 0)
877 return ret;
878
879 if (!iommu_present(&platform_bus_type))
880 bus_set_iommu(&platform_bus_type, &ipmmu_ops);
881
882 return 0;
883}
884
885static void __exit ipmmu_exit(void)
886{
887 return platform_driver_unregister(&ipmmu_driver);
888}
889
890subsys_initcall(ipmmu_init);
891module_exit(ipmmu_exit);
892
893MODULE_DESCRIPTION("IOMMU API for Renesas VMSA-compatible IPMMU");
894MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
895MODULE_LICENSE("GPL v2");