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-rw-r--r--arch/arm/plat-omap/iommu.c996
1 files changed, 996 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/iommu.c b/arch/arm/plat-omap/iommu.c
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index 000000000000..4cf449fa2cb5
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+++ b/arch/arm/plat-omap/iommu.c
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1/*
2 * omap iommu: tlb and pagetable primitives
3 *
4 * Copyright (C) 2008-2009 Nokia Corporation
5 *
6 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>,
7 * Paul Mundt and Toshihiro Kobayashi
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/err.h>
15#include <linux/module.h>
16#include <linux/interrupt.h>
17#include <linux/ioport.h>
18#include <linux/clk.h>
19#include <linux/platform_device.h>
20
21#include <asm/cacheflush.h>
22
23#include <mach/iommu.h>
24
25#include "iopgtable.h"
26
27/* accommodate the difference between omap1 and omap2/3 */
28static const struct iommu_functions *arch_iommu;
29
30static struct platform_driver omap_iommu_driver;
31static struct kmem_cache *iopte_cachep;
32
33/**
34 * install_iommu_arch - Install archtecure specific iommu functions
35 * @ops: a pointer to architecture specific iommu functions
36 *
37 * There are several kind of iommu algorithm(tlb, pagetable) among
38 * omap series. This interface installs such an iommu algorighm.
39 **/
40int install_iommu_arch(const struct iommu_functions *ops)
41{
42 if (arch_iommu)
43 return -EBUSY;
44
45 arch_iommu = ops;
46 return 0;
47}
48EXPORT_SYMBOL_GPL(install_iommu_arch);
49
50/**
51 * uninstall_iommu_arch - Uninstall archtecure specific iommu functions
52 * @ops: a pointer to architecture specific iommu functions
53 *
54 * This interface uninstalls the iommu algorighm installed previously.
55 **/
56void uninstall_iommu_arch(const struct iommu_functions *ops)
57{
58 if (arch_iommu != ops)
59 pr_err("%s: not your arch\n", __func__);
60
61 arch_iommu = NULL;
62}
63EXPORT_SYMBOL_GPL(uninstall_iommu_arch);
64
65/**
66 * iommu_save_ctx - Save registers for pm off-mode support
67 * @obj: target iommu
68 **/
69void iommu_save_ctx(struct iommu *obj)
70{
71 arch_iommu->save_ctx(obj);
72}
73EXPORT_SYMBOL_GPL(iommu_save_ctx);
74
75/**
76 * iommu_restore_ctx - Restore registers for pm off-mode support
77 * @obj: target iommu
78 **/
79void iommu_restore_ctx(struct iommu *obj)
80{
81 arch_iommu->restore_ctx(obj);
82}
83EXPORT_SYMBOL_GPL(iommu_restore_ctx);
84
85/**
86 * iommu_arch_version - Return running iommu arch version
87 **/
88u32 iommu_arch_version(void)
89{
90 return arch_iommu->version;
91}
92EXPORT_SYMBOL_GPL(iommu_arch_version);
93
94static int iommu_enable(struct iommu *obj)
95{
96 int err;
97
98 if (!obj)
99 return -EINVAL;
100
101 clk_enable(obj->clk);
102
103 err = arch_iommu->enable(obj);
104
105 clk_disable(obj->clk);
106 return err;
107}
108
109static void iommu_disable(struct iommu *obj)
110{
111 if (!obj)
112 return;
113
114 clk_enable(obj->clk);
115
116 arch_iommu->disable(obj);
117
118 clk_disable(obj->clk);
119}
120
121/*
122 * TLB operations
123 */
124void iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e)
125{
126 BUG_ON(!cr || !e);
127
128 arch_iommu->cr_to_e(cr, e);
129}
130EXPORT_SYMBOL_GPL(iotlb_cr_to_e);
131
132static inline int iotlb_cr_valid(struct cr_regs *cr)
133{
134 if (!cr)
135 return -EINVAL;
136
137 return arch_iommu->cr_valid(cr);
138}
139
140static inline struct cr_regs *iotlb_alloc_cr(struct iommu *obj,
141 struct iotlb_entry *e)
142{
143 if (!e)
144 return NULL;
145
146 return arch_iommu->alloc_cr(obj, e);
147}
148
149u32 iotlb_cr_to_virt(struct cr_regs *cr)
150{
151 return arch_iommu->cr_to_virt(cr);
152}
153EXPORT_SYMBOL_GPL(iotlb_cr_to_virt);
154
155static u32 get_iopte_attr(struct iotlb_entry *e)
156{
157 return arch_iommu->get_pte_attr(e);
158}
159
160static u32 iommu_report_fault(struct iommu *obj, u32 *da)
161{
162 return arch_iommu->fault_isr(obj, da);
163}
164
165static void iotlb_lock_get(struct iommu *obj, struct iotlb_lock *l)
166{
167 u32 val;
168
169 val = iommu_read_reg(obj, MMU_LOCK);
170
171 l->base = MMU_LOCK_BASE(val);
172 l->vict = MMU_LOCK_VICT(val);
173
174 BUG_ON(l->base != 0); /* Currently no preservation is used */
175}
176
177static void iotlb_lock_set(struct iommu *obj, struct iotlb_lock *l)
178{
179 u32 val;
180
181 BUG_ON(l->base != 0); /* Currently no preservation is used */
182
183 val = (l->base << MMU_LOCK_BASE_SHIFT);
184 val |= (l->vict << MMU_LOCK_VICT_SHIFT);
185
186 iommu_write_reg(obj, val, MMU_LOCK);
187}
188
189static void iotlb_read_cr(struct iommu *obj, struct cr_regs *cr)
190{
191 arch_iommu->tlb_read_cr(obj, cr);
192}
193
194static void iotlb_load_cr(struct iommu *obj, struct cr_regs *cr)
195{
196 arch_iommu->tlb_load_cr(obj, cr);
197
198 iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
199 iommu_write_reg(obj, 1, MMU_LD_TLB);
200}
201
202/**
203 * iotlb_dump_cr - Dump an iommu tlb entry into buf
204 * @obj: target iommu
205 * @cr: contents of cam and ram register
206 * @buf: output buffer
207 **/
208static inline ssize_t iotlb_dump_cr(struct iommu *obj, struct cr_regs *cr,
209 char *buf)
210{
211 BUG_ON(!cr || !buf);
212
213 return arch_iommu->dump_cr(obj, cr, buf);
214}
215
216/**
217 * load_iotlb_entry - Set an iommu tlb entry
218 * @obj: target iommu
219 * @e: an iommu tlb entry info
220 **/
221int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e)
222{
223 int i;
224 int err = 0;
225 struct iotlb_lock l;
226 struct cr_regs *cr;
227
228 if (!obj || !obj->nr_tlb_entries || !e)
229 return -EINVAL;
230
231 clk_enable(obj->clk);
232
233 for (i = 0; i < obj->nr_tlb_entries; i++) {
234 struct cr_regs tmp;
235
236 iotlb_lock_get(obj, &l);
237 l.vict = i;
238 iotlb_lock_set(obj, &l);
239 iotlb_read_cr(obj, &tmp);
240 if (!iotlb_cr_valid(&tmp))
241 break;
242 }
243
244 if (i == obj->nr_tlb_entries) {
245 dev_dbg(obj->dev, "%s: full: no entry\n", __func__);
246 err = -EBUSY;
247 goto out;
248 }
249
250 cr = iotlb_alloc_cr(obj, e);
251 if (IS_ERR(cr)) {
252 clk_disable(obj->clk);
253 return PTR_ERR(cr);
254 }
255
256 iotlb_load_cr(obj, cr);
257 kfree(cr);
258
259 /* increment victim for next tlb load */
260 if (++l.vict == obj->nr_tlb_entries)
261 l.vict = 0;
262 iotlb_lock_set(obj, &l);
263out:
264 clk_disable(obj->clk);
265 return err;
266}
267EXPORT_SYMBOL_GPL(load_iotlb_entry);
268
269/**
270 * flush_iotlb_page - Clear an iommu tlb entry
271 * @obj: target iommu
272 * @da: iommu device virtual address
273 *
274 * Clear an iommu tlb entry which includes 'da' address.
275 **/
276void flush_iotlb_page(struct iommu *obj, u32 da)
277{
278 struct iotlb_lock l;
279 int i;
280
281 clk_enable(obj->clk);
282
283 for (i = 0; i < obj->nr_tlb_entries; i++) {
284 struct cr_regs cr;
285 u32 start;
286 size_t bytes;
287
288 iotlb_lock_get(obj, &l);
289 l.vict = i;
290 iotlb_lock_set(obj, &l);
291 iotlb_read_cr(obj, &cr);
292 if (!iotlb_cr_valid(&cr))
293 continue;
294
295 start = iotlb_cr_to_virt(&cr);
296 bytes = iopgsz_to_bytes(cr.cam & 3);
297
298 if ((start <= da) && (da < start + bytes)) {
299 dev_dbg(obj->dev, "%s: %08x<=%08x(%x)\n",
300 __func__, start, da, bytes);
301
302 iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
303 }
304 }
305 clk_disable(obj->clk);
306
307 if (i == obj->nr_tlb_entries)
308 dev_dbg(obj->dev, "%s: no page for %08x\n", __func__, da);
309}
310EXPORT_SYMBOL_GPL(flush_iotlb_page);
311
312/**
313 * flush_iotlb_range - Clear an iommu tlb entries
314 * @obj: target iommu
315 * @start: iommu device virtual address(start)
316 * @end: iommu device virtual address(end)
317 *
318 * Clear an iommu tlb entry which includes 'da' address.
319 **/
320void flush_iotlb_range(struct iommu *obj, u32 start, u32 end)
321{
322 u32 da = start;
323
324 while (da < end) {
325 flush_iotlb_page(obj, da);
326 /* FIXME: Optimize for multiple page size */
327 da += IOPTE_SIZE;
328 }
329}
330EXPORT_SYMBOL_GPL(flush_iotlb_range);
331
332/**
333 * flush_iotlb_all - Clear all iommu tlb entries
334 * @obj: target iommu
335 **/
336void flush_iotlb_all(struct iommu *obj)
337{
338 struct iotlb_lock l;
339
340 clk_enable(obj->clk);
341
342 l.base = 0;
343 l.vict = 0;
344 iotlb_lock_set(obj, &l);
345
346 iommu_write_reg(obj, 1, MMU_GFLUSH);
347
348 clk_disable(obj->clk);
349}
350EXPORT_SYMBOL_GPL(flush_iotlb_all);
351
352#if defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE)
353
354ssize_t iommu_dump_ctx(struct iommu *obj, char *buf)
355{
356 ssize_t bytes;
357
358 if (!obj || !buf)
359 return -EINVAL;
360
361 clk_enable(obj->clk);
362
363 bytes = arch_iommu->dump_ctx(obj, buf);
364
365 clk_disable(obj->clk);
366
367 return bytes;
368}
369EXPORT_SYMBOL_GPL(iommu_dump_ctx);
370
371static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs)
372{
373 int i;
374 struct iotlb_lock saved, l;
375 struct cr_regs *p = crs;
376
377 clk_enable(obj->clk);
378
379 iotlb_lock_get(obj, &saved);
380 memcpy(&l, &saved, sizeof(saved));
381
382 for (i = 0; i < obj->nr_tlb_entries; i++) {
383 struct cr_regs tmp;
384
385 iotlb_lock_get(obj, &l);
386 l.vict = i;
387 iotlb_lock_set(obj, &l);
388 iotlb_read_cr(obj, &tmp);
389 if (!iotlb_cr_valid(&tmp))
390 continue;
391
392 *p++ = tmp;
393 }
394 iotlb_lock_set(obj, &saved);
395 clk_disable(obj->clk);
396
397 return p - crs;
398}
399
400/**
401 * dump_tlb_entries - dump cr arrays to given buffer
402 * @obj: target iommu
403 * @buf: output buffer
404 **/
405size_t dump_tlb_entries(struct iommu *obj, char *buf)
406{
407 int i, n;
408 struct cr_regs *cr;
409 char *p = buf;
410
411 cr = kcalloc(obj->nr_tlb_entries, sizeof(*cr), GFP_KERNEL);
412 if (!cr)
413 return 0;
414
415 n = __dump_tlb_entries(obj, cr);
416 for (i = 0; i < n; i++)
417 p += iotlb_dump_cr(obj, cr + i, p);
418 kfree(cr);
419
420 return p - buf;
421}
422EXPORT_SYMBOL_GPL(dump_tlb_entries);
423
424int foreach_iommu_device(void *data, int (*fn)(struct device *, void *))
425{
426 return driver_for_each_device(&omap_iommu_driver.driver,
427 NULL, data, fn);
428}
429EXPORT_SYMBOL_GPL(foreach_iommu_device);
430
431#endif /* CONFIG_OMAP_IOMMU_DEBUG_MODULE */
432
433/*
434 * H/W pagetable operations
435 */
436static void flush_iopgd_range(u32 *first, u32 *last)
437{
438 /* FIXME: L2 cache should be taken care of if it exists */
439 do {
440 asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pgd"
441 : : "r" (first));
442 first += L1_CACHE_BYTES / sizeof(*first);
443 } while (first <= last);
444}
445
446static void flush_iopte_range(u32 *first, u32 *last)
447{
448 /* FIXME: L2 cache should be taken care of if it exists */
449 do {
450 asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pte"
451 : : "r" (first));
452 first += L1_CACHE_BYTES / sizeof(*first);
453 } while (first <= last);
454}
455
456static void iopte_free(u32 *iopte)
457{
458 /* Note: freed iopte's must be clean ready for re-use */
459 kmem_cache_free(iopte_cachep, iopte);
460}
461
462static u32 *iopte_alloc(struct iommu *obj, u32 *iopgd, u32 da)
463{
464 u32 *iopte;
465
466 /* a table has already existed */
467 if (*iopgd)
468 goto pte_ready;
469
470 /*
471 * do the allocation outside the page table lock
472 */
473 spin_unlock(&obj->page_table_lock);
474 iopte = kmem_cache_zalloc(iopte_cachep, GFP_KERNEL);
475 spin_lock(&obj->page_table_lock);
476
477 if (!*iopgd) {
478 if (!iopte)
479 return ERR_PTR(-ENOMEM);
480
481 *iopgd = virt_to_phys(iopte) | IOPGD_TABLE;
482 flush_iopgd_range(iopgd, iopgd);
483
484 dev_vdbg(obj->dev, "%s: a new pte:%p\n", __func__, iopte);
485 } else {
486 /* We raced, free the reduniovant table */
487 iopte_free(iopte);
488 }
489
490pte_ready:
491 iopte = iopte_offset(iopgd, da);
492
493 dev_vdbg(obj->dev,
494 "%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n",
495 __func__, da, iopgd, *iopgd, iopte, *iopte);
496
497 return iopte;
498}
499
500static int iopgd_alloc_section(struct iommu *obj, u32 da, u32 pa, u32 prot)
501{
502 u32 *iopgd = iopgd_offset(obj, da);
503
504 *iopgd = (pa & IOSECTION_MASK) | prot | IOPGD_SECTION;
505 flush_iopgd_range(iopgd, iopgd);
506 return 0;
507}
508
509static int iopgd_alloc_super(struct iommu *obj, u32 da, u32 pa, u32 prot)
510{
511 u32 *iopgd = iopgd_offset(obj, da);
512 int i;
513
514 for (i = 0; i < 16; i++)
515 *(iopgd + i) = (pa & IOSUPER_MASK) | prot | IOPGD_SUPER;
516 flush_iopgd_range(iopgd, iopgd + 15);
517 return 0;
518}
519
520static int iopte_alloc_page(struct iommu *obj, u32 da, u32 pa, u32 prot)
521{
522 u32 *iopgd = iopgd_offset(obj, da);
523 u32 *iopte = iopte_alloc(obj, iopgd, da);
524
525 if (IS_ERR(iopte))
526 return PTR_ERR(iopte);
527
528 *iopte = (pa & IOPAGE_MASK) | prot | IOPTE_SMALL;
529 flush_iopte_range(iopte, iopte);
530
531 dev_vdbg(obj->dev, "%s: da:%08x pa:%08x pte:%p *pte:%08x\n",
532 __func__, da, pa, iopte, *iopte);
533
534 return 0;
535}
536
537static int iopte_alloc_large(struct iommu *obj, u32 da, u32 pa, u32 prot)
538{
539 u32 *iopgd = iopgd_offset(obj, da);
540 u32 *iopte = iopte_alloc(obj, iopgd, da);
541 int i;
542
543 if (IS_ERR(iopte))
544 return PTR_ERR(iopte);
545
546 for (i = 0; i < 16; i++)
547 *(iopte + i) = (pa & IOLARGE_MASK) | prot | IOPTE_LARGE;
548 flush_iopte_range(iopte, iopte + 15);
549 return 0;
550}
551
552static int iopgtable_store_entry_core(struct iommu *obj, struct iotlb_entry *e)
553{
554 int (*fn)(struct iommu *, u32, u32, u32);
555 u32 prot;
556 int err;
557
558 if (!obj || !e)
559 return -EINVAL;
560
561 switch (e->pgsz) {
562 case MMU_CAM_PGSZ_16M:
563 fn = iopgd_alloc_super;
564 break;
565 case MMU_CAM_PGSZ_1M:
566 fn = iopgd_alloc_section;
567 break;
568 case MMU_CAM_PGSZ_64K:
569 fn = iopte_alloc_large;
570 break;
571 case MMU_CAM_PGSZ_4K:
572 fn = iopte_alloc_page;
573 break;
574 default:
575 fn = NULL;
576 BUG();
577 break;
578 }
579
580 prot = get_iopte_attr(e);
581
582 spin_lock(&obj->page_table_lock);
583 err = fn(obj, e->da, e->pa, prot);
584 spin_unlock(&obj->page_table_lock);
585
586 return err;
587}
588
589/**
590 * iopgtable_store_entry - Make an iommu pte entry
591 * @obj: target iommu
592 * @e: an iommu tlb entry info
593 **/
594int iopgtable_store_entry(struct iommu *obj, struct iotlb_entry *e)
595{
596 int err;
597
598 flush_iotlb_page(obj, e->da);
599 err = iopgtable_store_entry_core(obj, e);
600#ifdef PREFETCH_IOTLB
601 if (!err)
602 load_iotlb_entry(obj, e);
603#endif
604 return err;
605}
606EXPORT_SYMBOL_GPL(iopgtable_store_entry);
607
608/**
609 * iopgtable_lookup_entry - Lookup an iommu pte entry
610 * @obj: target iommu
611 * @da: iommu device virtual address
612 * @ppgd: iommu pgd entry pointer to be returned
613 * @ppte: iommu pte entry pointer to be returned
614 **/
615void iopgtable_lookup_entry(struct iommu *obj, u32 da, u32 **ppgd, u32 **ppte)
616{
617 u32 *iopgd, *iopte = NULL;
618
619 iopgd = iopgd_offset(obj, da);
620 if (!*iopgd)
621 goto out;
622
623 if (*iopgd & IOPGD_TABLE)
624 iopte = iopte_offset(iopgd, da);
625out:
626 *ppgd = iopgd;
627 *ppte = iopte;
628}
629EXPORT_SYMBOL_GPL(iopgtable_lookup_entry);
630
631static size_t iopgtable_clear_entry_core(struct iommu *obj, u32 da)
632{
633 size_t bytes;
634 u32 *iopgd = iopgd_offset(obj, da);
635 int nent = 1;
636
637 if (!*iopgd)
638 return 0;
639
640 if (*iopgd & IOPGD_TABLE) {
641 int i;
642 u32 *iopte = iopte_offset(iopgd, da);
643
644 bytes = IOPTE_SIZE;
645 if (*iopte & IOPTE_LARGE) {
646 nent *= 16;
647 /* rewind to the 1st entry */
648 iopte = (u32 *)((u32)iopte & IOLARGE_MASK);
649 }
650 bytes *= nent;
651 memset(iopte, 0, nent * sizeof(*iopte));
652 flush_iopte_range(iopte, iopte + (nent - 1) * sizeof(*iopte));
653
654 /*
655 * do table walk to check if this table is necessary or not
656 */
657 iopte = iopte_offset(iopgd, 0);
658 for (i = 0; i < PTRS_PER_IOPTE; i++)
659 if (iopte[i])
660 goto out;
661
662 iopte_free(iopte);
663 nent = 1; /* for the next L1 entry */
664 } else {
665 bytes = IOPGD_SIZE;
666 if (*iopgd & IOPGD_SUPER) {
667 nent *= 16;
668 /* rewind to the 1st entry */
669 iopgd = (u32 *)((u32)iopgd & IOSUPER_MASK);
670 }
671 bytes *= nent;
672 }
673 memset(iopgd, 0, nent * sizeof(*iopgd));
674 flush_iopgd_range(iopgd, iopgd + (nent - 1) * sizeof(*iopgd));
675out:
676 return bytes;
677}
678
679/**
680 * iopgtable_clear_entry - Remove an iommu pte entry
681 * @obj: target iommu
682 * @da: iommu device virtual address
683 **/
684size_t iopgtable_clear_entry(struct iommu *obj, u32 da)
685{
686 size_t bytes;
687
688 spin_lock(&obj->page_table_lock);
689
690 bytes = iopgtable_clear_entry_core(obj, da);
691 flush_iotlb_page(obj, da);
692
693 spin_unlock(&obj->page_table_lock);
694
695 return bytes;
696}
697EXPORT_SYMBOL_GPL(iopgtable_clear_entry);
698
699static void iopgtable_clear_entry_all(struct iommu *obj)
700{
701 int i;
702
703 spin_lock(&obj->page_table_lock);
704
705 for (i = 0; i < PTRS_PER_IOPGD; i++) {
706 u32 da;
707 u32 *iopgd;
708
709 da = i << IOPGD_SHIFT;
710 iopgd = iopgd_offset(obj, da);
711
712 if (!*iopgd)
713 continue;
714
715 if (*iopgd & IOPGD_TABLE)
716 iopte_free(iopte_offset(iopgd, 0));
717
718 *iopgd = 0;
719 flush_iopgd_range(iopgd, iopgd);
720 }
721
722 flush_iotlb_all(obj);
723
724 spin_unlock(&obj->page_table_lock);
725}
726
727/*
728 * Device IOMMU generic operations
729 */
730static irqreturn_t iommu_fault_handler(int irq, void *data)
731{
732 u32 stat, da;
733 u32 *iopgd, *iopte;
734 int err = -EIO;
735 struct iommu *obj = data;
736
737 if (!obj->refcount)
738 return IRQ_NONE;
739
740 /* Dynamic loading TLB or PTE */
741 if (obj->isr)
742 err = obj->isr(obj);
743
744 if (!err)
745 return IRQ_HANDLED;
746
747 clk_enable(obj->clk);
748 stat = iommu_report_fault(obj, &da);
749 clk_disable(obj->clk);
750 if (!stat)
751 return IRQ_HANDLED;
752
753 iopgd = iopgd_offset(obj, da);
754
755 if (!(*iopgd & IOPGD_TABLE)) {
756 dev_err(obj->dev, "%s: da:%08x pgd:%p *pgd:%08x\n", __func__,
757 da, iopgd, *iopgd);
758 return IRQ_NONE;
759 }
760
761 iopte = iopte_offset(iopgd, da);
762
763 dev_err(obj->dev, "%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n",
764 __func__, da, iopgd, *iopgd, iopte, *iopte);
765
766 return IRQ_NONE;
767}
768
769static int device_match_by_alias(struct device *dev, void *data)
770{
771 struct iommu *obj = to_iommu(dev);
772 const char *name = data;
773
774 pr_debug("%s: %s %s\n", __func__, obj->name, name);
775
776 return strcmp(obj->name, name) == 0;
777}
778
779/**
780 * iommu_get - Get iommu handler
781 * @name: target iommu name
782 **/
783struct iommu *iommu_get(const char *name)
784{
785 int err = -ENOMEM;
786 struct device *dev;
787 struct iommu *obj;
788
789 dev = driver_find_device(&omap_iommu_driver.driver, NULL, (void *)name,
790 device_match_by_alias);
791 if (!dev)
792 return ERR_PTR(-ENODEV);
793
794 obj = to_iommu(dev);
795
796 mutex_lock(&obj->iommu_lock);
797
798 if (obj->refcount++ == 0) {
799 err = iommu_enable(obj);
800 if (err)
801 goto err_enable;
802 flush_iotlb_all(obj);
803 }
804
805 if (!try_module_get(obj->owner))
806 goto err_module;
807
808 mutex_unlock(&obj->iommu_lock);
809
810 dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
811 return obj;
812
813err_module:
814 if (obj->refcount == 1)
815 iommu_disable(obj);
816err_enable:
817 obj->refcount--;
818 mutex_unlock(&obj->iommu_lock);
819 return ERR_PTR(err);
820}
821EXPORT_SYMBOL_GPL(iommu_get);
822
823/**
824 * iommu_put - Put back iommu handler
825 * @obj: target iommu
826 **/
827void iommu_put(struct iommu *obj)
828{
829 if (!obj && IS_ERR(obj))
830 return;
831
832 mutex_lock(&obj->iommu_lock);
833
834 if (--obj->refcount == 0)
835 iommu_disable(obj);
836
837 module_put(obj->owner);
838
839 mutex_unlock(&obj->iommu_lock);
840
841 dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
842}
843EXPORT_SYMBOL_GPL(iommu_put);
844
845/*
846 * OMAP Device MMU(IOMMU) detection
847 */
848static int __devinit omap_iommu_probe(struct platform_device *pdev)
849{
850 int err = -ENODEV;
851 void *p;
852 int irq;
853 struct iommu *obj;
854 struct resource *res;
855 struct iommu_platform_data *pdata = pdev->dev.platform_data;
856
857 if (pdev->num_resources != 2)
858 return -EINVAL;
859
860 obj = kzalloc(sizeof(*obj) + MMU_REG_SIZE, GFP_KERNEL);
861 if (!obj)
862 return -ENOMEM;
863
864 obj->clk = clk_get(&pdev->dev, pdata->clk_name);
865 if (IS_ERR(obj->clk))
866 goto err_clk;
867
868 obj->nr_tlb_entries = pdata->nr_tlb_entries;
869 obj->name = pdata->name;
870 obj->dev = &pdev->dev;
871 obj->ctx = (void *)obj + sizeof(*obj);
872
873 mutex_init(&obj->iommu_lock);
874 mutex_init(&obj->mmap_lock);
875 spin_lock_init(&obj->page_table_lock);
876 INIT_LIST_HEAD(&obj->mmap);
877
878 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
879 if (!res) {
880 err = -ENODEV;
881 goto err_mem;
882 }
883 obj->regbase = ioremap(res->start, resource_size(res));
884 if (!obj->regbase) {
885 err = -ENOMEM;
886 goto err_mem;
887 }
888
889 res = request_mem_region(res->start, resource_size(res),
890 dev_name(&pdev->dev));
891 if (!res) {
892 err = -EIO;
893 goto err_mem;
894 }
895
896 irq = platform_get_irq(pdev, 0);
897 if (irq < 0) {
898 err = -ENODEV;
899 goto err_irq;
900 }
901 err = request_irq(irq, iommu_fault_handler, IRQF_SHARED,
902 dev_name(&pdev->dev), obj);
903 if (err < 0)
904 goto err_irq;
905 platform_set_drvdata(pdev, obj);
906
907 p = (void *)__get_free_pages(GFP_KERNEL, get_order(IOPGD_TABLE_SIZE));
908 if (!p) {
909 err = -ENOMEM;
910 goto err_pgd;
911 }
912 memset(p, 0, IOPGD_TABLE_SIZE);
913 clean_dcache_area(p, IOPGD_TABLE_SIZE);
914 obj->iopgd = p;
915
916 BUG_ON(!IS_ALIGNED((unsigned long)obj->iopgd, IOPGD_TABLE_SIZE));
917
918 dev_info(&pdev->dev, "%s registered\n", obj->name);
919 return 0;
920
921err_pgd:
922 free_irq(irq, obj);
923err_irq:
924 release_mem_region(res->start, resource_size(res));
925 iounmap(obj->regbase);
926err_mem:
927 clk_put(obj->clk);
928err_clk:
929 kfree(obj);
930 return err;
931}
932
933static int __devexit omap_iommu_remove(struct platform_device *pdev)
934{
935 int irq;
936 struct resource *res;
937 struct iommu *obj = platform_get_drvdata(pdev);
938
939 platform_set_drvdata(pdev, NULL);
940
941 iopgtable_clear_entry_all(obj);
942 free_pages((unsigned long)obj->iopgd, get_order(IOPGD_TABLE_SIZE));
943
944 irq = platform_get_irq(pdev, 0);
945 free_irq(irq, obj);
946 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
947 release_mem_region(res->start, resource_size(res));
948 iounmap(obj->regbase);
949
950 clk_put(obj->clk);
951 dev_info(&pdev->dev, "%s removed\n", obj->name);
952 kfree(obj);
953 return 0;
954}
955
956static struct platform_driver omap_iommu_driver = {
957 .probe = omap_iommu_probe,
958 .remove = __devexit_p(omap_iommu_remove),
959 .driver = {
960 .name = "omap-iommu",
961 },
962};
963
964static void iopte_cachep_ctor(void *iopte)
965{
966 clean_dcache_area(iopte, IOPTE_TABLE_SIZE);
967}
968
969static int __init omap_iommu_init(void)
970{
971 struct kmem_cache *p;
972 const unsigned long flags = SLAB_HWCACHE_ALIGN;
973 size_t align = 1 << 10; /* L2 pagetable alignement */
974
975 p = kmem_cache_create("iopte_cache", IOPTE_TABLE_SIZE, align, flags,
976 iopte_cachep_ctor);
977 if (!p)
978 return -ENOMEM;
979 iopte_cachep = p;
980
981 return platform_driver_register(&omap_iommu_driver);
982}
983module_init(omap_iommu_init);
984
985static void __exit omap_iommu_exit(void)
986{
987 kmem_cache_destroy(iopte_cachep);
988
989 platform_driver_unregister(&omap_iommu_driver);
990}
991module_exit(omap_iommu_exit);
992
993MODULE_DESCRIPTION("omap iommu: tlb and pagetable primitives");
994MODULE_ALIAS("platform:omap-iommu");
995MODULE_AUTHOR("Hiroshi DOYU, Paul Mundt and Toshihiro Kobayashi");
996MODULE_LICENSE("GPL v2");
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-18 10:02:51 -0500