1
2
3
4
5
6
7
8
9
10
11
12
13
14#include <linux/err.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/interrupt.h>
18#include <linux/ioport.h>
19#include <linux/clk.h>
20#include <linux/platform_device.h>
21
22#include <asm/cacheflush.h>
23
24#include <plat/iommu.h>
25
26#include "iopgtable.h"
27
28#define for_each_iotlb_cr(obj, n, __i, cr) \
29 for (__i = 0; \
30 (__i < (n)) && (cr = __iotlb_read_cr((obj), __i), true); \
31 __i++)
32
33
34static const struct iommu_functions *arch_iommu;
35
36static struct platform_driver omap_iommu_driver;
37static struct kmem_cache *iopte_cachep;
38
39
40
41
42
43
44
45
46int install_iommu_arch(const struct iommu_functions *ops)
47{
48 if (arch_iommu)
49 return -EBUSY;
50
51 arch_iommu = ops;
52 return 0;
53}
54EXPORT_SYMBOL_GPL(install_iommu_arch);
55
56
57
58
59
60
61
62void uninstall_iommu_arch(const struct iommu_functions *ops)
63{
64 if (arch_iommu != ops)
65 pr_err("%s: not your arch\n", __func__);
66
67 arch_iommu = NULL;
68}
69EXPORT_SYMBOL_GPL(uninstall_iommu_arch);
70
71
72
73
74
75void iommu_save_ctx(struct iommu *obj)
76{
77 arch_iommu->save_ctx(obj);
78}
79EXPORT_SYMBOL_GPL(iommu_save_ctx);
80
81
82
83
84
85void iommu_restore_ctx(struct iommu *obj)
86{
87 arch_iommu->restore_ctx(obj);
88}
89EXPORT_SYMBOL_GPL(iommu_restore_ctx);
90
91
92
93
94u32 iommu_arch_version(void)
95{
96 return arch_iommu->version;
97}
98EXPORT_SYMBOL_GPL(iommu_arch_version);
99
100static int iommu_enable(struct iommu *obj)
101{
102 int err;
103
104 if (!obj)
105 return -EINVAL;
106
107 clk_enable(obj->clk);
108
109 err = arch_iommu->enable(obj);
110
111 clk_disable(obj->clk);
112 return err;
113}
114
115static void iommu_disable(struct iommu *obj)
116{
117 if (!obj)
118 return;
119
120 clk_enable(obj->clk);
121
122 arch_iommu->disable(obj);
123
124 clk_disable(obj->clk);
125}
126
127
128
129
130void iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e)
131{
132 BUG_ON(!cr || !e);
133
134 arch_iommu->cr_to_e(cr, e);
135}
136EXPORT_SYMBOL_GPL(iotlb_cr_to_e);
137
138static inline int iotlb_cr_valid(struct cr_regs *cr)
139{
140 if (!cr)
141 return -EINVAL;
142
143 return arch_iommu->cr_valid(cr);
144}
145
146static inline struct cr_regs *iotlb_alloc_cr(struct iommu *obj,
147 struct iotlb_entry *e)
148{
149 if (!e)
150 return NULL;
151
152 return arch_iommu->alloc_cr(obj, e);
153}
154
155u32 iotlb_cr_to_virt(struct cr_regs *cr)
156{
157 return arch_iommu->cr_to_virt(cr);
158}
159EXPORT_SYMBOL_GPL(iotlb_cr_to_virt);
160
161static u32 get_iopte_attr(struct iotlb_entry *e)
162{
163 return arch_iommu->get_pte_attr(e);
164}
165
166static u32 iommu_report_fault(struct iommu *obj, u32 *da)
167{
168 return arch_iommu->fault_isr(obj, da);
169}
170
171static void iotlb_lock_get(struct iommu *obj, struct iotlb_lock *l)
172{
173 u32 val;
174
175 val = iommu_read_reg(obj, MMU_LOCK);
176
177 l->base = MMU_LOCK_BASE(val);
178 l->vict = MMU_LOCK_VICT(val);
179
180}
181
182static void iotlb_lock_set(struct iommu *obj, struct iotlb_lock *l)
183{
184 u32 val;
185
186 val = (l->base << MMU_LOCK_BASE_SHIFT);
187 val |= (l->vict << MMU_LOCK_VICT_SHIFT);
188
189 iommu_write_reg(obj, val, MMU_LOCK);
190}
191
192static void iotlb_read_cr(struct iommu *obj, struct cr_regs *cr)
193{
194 arch_iommu->tlb_read_cr(obj, cr);
195}
196
197static void iotlb_load_cr(struct iommu *obj, struct cr_regs *cr)
198{
199 arch_iommu->tlb_load_cr(obj, cr);
200
201 iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
202 iommu_write_reg(obj, 1, MMU_LD_TLB);
203}
204
205
206
207
208
209
210
211static inline ssize_t iotlb_dump_cr(struct iommu *obj, struct cr_regs *cr,
212 char *buf)
213{
214 BUG_ON(!cr || !buf);
215
216 return arch_iommu->dump_cr(obj, cr, buf);
217}
218
219
220static struct cr_regs __iotlb_read_cr(struct iommu *obj, int n)
221{
222 struct cr_regs cr;
223 struct iotlb_lock l;
224
225 iotlb_lock_get(obj, &l);
226 l.vict = n;
227 iotlb_lock_set(obj, &l);
228 iotlb_read_cr(obj, &cr);
229
230 return cr;
231}
232
233
234
235
236
237
238int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e)
239{
240 int err = 0;
241 struct iotlb_lock l;
242 struct cr_regs *cr;
243
244 if (!obj || !obj->nr_tlb_entries || !e)
245 return -EINVAL;
246
247 clk_enable(obj->clk);
248
249 iotlb_lock_get(obj, &l);
250 if (l.base == obj->nr_tlb_entries) {
251 dev_warn(obj->dev, "%s: preserve entries full\n", __func__);
252 err = -EBUSY;
253 goto out;
254 }
255 if (!e->prsvd) {
256 int i;
257 struct cr_regs tmp;
258
259 for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, tmp)
260 if (!iotlb_cr_valid(&tmp))
261 break;
262
263 if (i == obj->nr_tlb_entries) {
264 dev_dbg(obj->dev, "%s: full: no entry\n", __func__);
265 err = -EBUSY;
266 goto out;
267 }
268
269 iotlb_lock_get(obj, &l);
270 } else {
271 l.vict = l.base;
272 iotlb_lock_set(obj, &l);
273 }
274
275 cr = iotlb_alloc_cr(obj, e);
276 if (IS_ERR(cr)) {
277 clk_disable(obj->clk);
278 return PTR_ERR(cr);
279 }
280
281 iotlb_load_cr(obj, cr);
282 kfree(cr);
283
284 if (e->prsvd)
285 l.base++;
286
287 if (++l.vict == obj->nr_tlb_entries)
288 l.vict = l.base;
289 iotlb_lock_set(obj, &l);
290out:
291 clk_disable(obj->clk);
292 return err;
293}
294EXPORT_SYMBOL_GPL(load_iotlb_entry);
295
296
297
298
299
300
301
302
303void flush_iotlb_page(struct iommu *obj, u32 da)
304{
305 int i;
306 struct cr_regs cr;
307
308 clk_enable(obj->clk);
309
310 for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, cr) {
311 u32 start;
312 size_t bytes;
313
314 if (!iotlb_cr_valid(&cr))
315 continue;
316
317 start = iotlb_cr_to_virt(&cr);
318 bytes = iopgsz_to_bytes(cr.cam & 3);
319
320 if ((start <= da) && (da < start + bytes)) {
321 dev_dbg(obj->dev, "%s: %08x<=%08x(%x)\n",
322 __func__, start, da, bytes);
323 iotlb_load_cr(obj, &cr);
324 iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
325 }
326 }
327 clk_disable(obj->clk);
328
329 if (i == obj->nr_tlb_entries)
330 dev_dbg(obj->dev, "%s: no page for %08x\n", __func__, da);
331}
332EXPORT_SYMBOL_GPL(flush_iotlb_page);
333
334
335
336
337
338
339
340
341
342void flush_iotlb_range(struct iommu *obj, u32 start, u32 end)
343{
344 u32 da = start;
345
346 while (da < end) {
347 flush_iotlb_page(obj, da);
348
349 da += IOPTE_SIZE;
350 }
351}
352EXPORT_SYMBOL_GPL(flush_iotlb_range);
353
354
355
356
357
358void flush_iotlb_all(struct iommu *obj)
359{
360 struct iotlb_lock l;
361
362 clk_enable(obj->clk);
363
364 l.base = 0;
365 l.vict = 0;
366 iotlb_lock_set(obj, &l);
367
368 iommu_write_reg(obj, 1, MMU_GFLUSH);
369
370 clk_disable(obj->clk);
371}
372EXPORT_SYMBOL_GPL(flush_iotlb_all);
373
374
375
376
377
378
379
380
381
382
383void iommu_set_twl(struct iommu *obj, bool on)
384{
385 clk_enable(obj->clk);
386 arch_iommu->set_twl(obj, on);
387 clk_disable(obj->clk);
388}
389EXPORT_SYMBOL_GPL(iommu_set_twl);
390
391#if defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE)
392
393ssize_t iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t bytes)
394{
395 if (!obj || !buf)
396 return -EINVAL;
397
398 clk_enable(obj->clk);
399
400 bytes = arch_iommu->dump_ctx(obj, buf, bytes);
401
402 clk_disable(obj->clk);
403
404 return bytes;
405}
406EXPORT_SYMBOL_GPL(iommu_dump_ctx);
407
408static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs, int num)
409{
410 int i;
411 struct iotlb_lock saved;
412 struct cr_regs tmp;
413 struct cr_regs *p = crs;
414
415 clk_enable(obj->clk);
416 iotlb_lock_get(obj, &saved);
417
418 for_each_iotlb_cr(obj, num, i, tmp) {
419 if (!iotlb_cr_valid(&tmp))
420 continue;
421 *p++ = tmp;
422 }
423
424 iotlb_lock_set(obj, &saved);
425 clk_disable(obj->clk);
426
427 return p - crs;
428}
429
430
431
432
433
434
435size_t dump_tlb_entries(struct iommu *obj, char *buf, ssize_t bytes)
436{
437 int i, num;
438 struct cr_regs *cr;
439 char *p = buf;
440
441 num = bytes / sizeof(*cr);
442 num = min(obj->nr_tlb_entries, num);
443
444 cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
445 if (!cr)
446 return 0;
447
448 num = __dump_tlb_entries(obj, cr, num);
449 for (i = 0; i < num; i++)
450 p += iotlb_dump_cr(obj, cr + i, p);
451 kfree(cr);
452
453 return p - buf;
454}
455EXPORT_SYMBOL_GPL(dump_tlb_entries);
456
457int foreach_iommu_device(void *data, int (*fn)(struct device *, void *))
458{
459 return driver_for_each_device(&omap_iommu_driver.driver,
460 NULL, data, fn);
461}
462EXPORT_SYMBOL_GPL(foreach_iommu_device);
463
464#endif
465
466
467
468
469static void flush_iopgd_range(u32 *first, u32 *last)
470{
471
472 do {
473 asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pgd"
474 : : "r" (first));
475 first += L1_CACHE_BYTES / sizeof(*first);
476 } while (first <= last);
477}
478
479static void flush_iopte_range(u32 *first, u32 *last)
480{
481
482 do {
483 asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pte"
484 : : "r" (first));
485 first += L1_CACHE_BYTES / sizeof(*first);
486 } while (first <= last);
487}
488
489static void iopte_free(u32 *iopte)
490{
491
492 kmem_cache_free(iopte_cachep, iopte);
493}
494
495static u32 *iopte_alloc(struct iommu *obj, u32 *iopgd, u32 da)
496{
497 u32 *iopte;
498
499
500 if (*iopgd)
501 goto pte_ready;
502
503
504
505
506 spin_unlock(&obj->page_table_lock);
507 iopte = kmem_cache_zalloc(iopte_cachep, GFP_KERNEL);
508 spin_lock(&obj->page_table_lock);
509
510 if (!*iopgd) {
511 if (!iopte)
512 return ERR_PTR(-ENOMEM);
513
514 *iopgd = virt_to_phys(iopte) | IOPGD_TABLE;
515 flush_iopgd_range(iopgd, iopgd);
516
517 dev_vdbg(obj->dev, "%s: a new pte:%p\n", __func__, iopte);
518 } else {
519
520 iopte_free(iopte);
521 }
522
523pte_ready:
524 iopte = iopte_offset(iopgd, da);
525
526 dev_vdbg(obj->dev,
527 "%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n",
528 __func__, da, iopgd, *iopgd, iopte, *iopte);
529
530 return iopte;
531}
532
533static int iopgd_alloc_section(struct iommu *obj, u32 da, u32 pa, u32 prot)
534{
535 u32 *iopgd = iopgd_offset(obj, da);
536
537 if ((da | pa) & ~IOSECTION_MASK) {
538 dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n",
539 __func__, da, pa, IOSECTION_SIZE);
540 return -EINVAL;
541 }
542
543 *iopgd = (pa & IOSECTION_MASK) | prot | IOPGD_SECTION;
544 flush_iopgd_range(iopgd, iopgd);
545 return 0;
546}
547
548static int iopgd_alloc_super(struct iommu *obj, u32 da, u32 pa, u32 prot)
549{
550 u32 *iopgd = iopgd_offset(obj, da);
551 int i;
552
553 if ((da | pa) & ~IOSUPER_MASK) {
554 dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n",
555 __func__, da, pa, IOSUPER_SIZE);
556 return -EINVAL;
557 }
558
559 for (i = 0; i < 16; i++)
560 *(iopgd + i) = (pa & IOSUPER_MASK) | prot | IOPGD_SUPER;
561 flush_iopgd_range(iopgd, iopgd + 15);
562 return 0;
563}
564
565static int iopte_alloc_page(struct iommu *obj, u32 da, u32 pa, u32 prot)
566{
567 u32 *iopgd = iopgd_offset(obj, da);
568 u32 *iopte = iopte_alloc(obj, iopgd, da);
569
570 if (IS_ERR(iopte))
571 return PTR_ERR(iopte);
572
573 *iopte = (pa & IOPAGE_MASK) | prot | IOPTE_SMALL;
574 flush_iopte_range(iopte, iopte);
575
576 dev_vdbg(obj->dev, "%s: da:%08x pa:%08x pte:%p *pte:%08x\n",
577 __func__, da, pa, iopte, *iopte);
578
579 return 0;
580}
581
582static int iopte_alloc_large(struct iommu *obj, u32 da, u32 pa, u32 prot)
583{
584 u32 *iopgd = iopgd_offset(obj, da);
585 u32 *iopte = iopte_alloc(obj, iopgd, da);
586 int i;
587
588 if ((da | pa) & ~IOLARGE_MASK) {
589 dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n",
590 __func__, da, pa, IOLARGE_SIZE);
591 return -EINVAL;
592 }
593
594 if (IS_ERR(iopte))
595 return PTR_ERR(iopte);
596
597 for (i = 0; i < 16; i++)
598 *(iopte + i) = (pa & IOLARGE_MASK) | prot | IOPTE_LARGE;
599 flush_iopte_range(iopte, iopte + 15);
600 return 0;
601}
602
603static int iopgtable_store_entry_core(struct iommu *obj, struct iotlb_entry *e)
604{
605 int (*fn)(struct iommu *, u32, u32, u32);
606 u32 prot;
607 int err;
608
609 if (!obj || !e)
610 return -EINVAL;
611
612 switch (e->pgsz) {
613 case MMU_CAM_PGSZ_16M:
614 fn = iopgd_alloc_super;
615 break;
616 case MMU_CAM_PGSZ_1M:
617 fn = iopgd_alloc_section;
618 break;
619 case MMU_CAM_PGSZ_64K:
620 fn = iopte_alloc_large;
621 break;
622 case MMU_CAM_PGSZ_4K:
623 fn = iopte_alloc_page;
624 break;
625 default:
626 fn = NULL;
627 BUG();
628 break;
629 }
630
631 prot = get_iopte_attr(e);
632
633 spin_lock(&obj->page_table_lock);
634 err = fn(obj, e->da, e->pa, prot);
635 spin_unlock(&obj->page_table_lock);
636
637 return err;
638}
639
640
641
642
643
644
645int iopgtable_store_entry(struct iommu *obj, struct iotlb_entry *e)
646{
647 int err;
648
649 flush_iotlb_page(obj, e->da);
650 err = iopgtable_store_entry_core(obj, e);
651#ifdef PREFETCH_IOTLB
652 if (!err)
653 load_iotlb_entry(obj, e);
654#endif
655 return err;
656}
657EXPORT_SYMBOL_GPL(iopgtable_store_entry);
658
659
660
661
662
663
664
665
666void iopgtable_lookup_entry(struct iommu *obj, u32 da, u32 **ppgd, u32 **ppte)
667{
668 u32 *iopgd, *iopte = NULL;
669
670 iopgd = iopgd_offset(obj, da);
671 if (!*iopgd)
672 goto out;
673
674 if (iopgd_is_table(*iopgd))
675 iopte = iopte_offset(iopgd, da);
676out:
677 *ppgd = iopgd;
678 *ppte = iopte;
679}
680EXPORT_SYMBOL_GPL(iopgtable_lookup_entry);
681
682static size_t iopgtable_clear_entry_core(struct iommu *obj, u32 da)
683{
684 size_t bytes;
685 u32 *iopgd = iopgd_offset(obj, da);
686 int nent = 1;
687
688 if (!*iopgd)
689 return 0;
690
691 if (iopgd_is_table(*iopgd)) {
692 int i;
693 u32 *iopte = iopte_offset(iopgd, da);
694
695 bytes = IOPTE_SIZE;
696 if (*iopte & IOPTE_LARGE) {
697 nent *= 16;
698
699 iopte = iopte_offset(iopgd, (da & IOLARGE_MASK));
700 }
701 bytes *= nent;
702 memset(iopte, 0, nent * sizeof(*iopte));
703 flush_iopte_range(iopte, iopte + (nent - 1) * sizeof(*iopte));
704
705
706
707
708 iopte = iopte_offset(iopgd, 0);
709 for (i = 0; i < PTRS_PER_IOPTE; i++)
710 if (iopte[i])
711 goto out;
712
713 iopte_free(iopte);
714 nent = 1;
715 } else {
716 bytes = IOPGD_SIZE;
717 if ((*iopgd & IOPGD_SUPER) == IOPGD_SUPER) {
718 nent *= 16;
719
720 iopgd = iopgd_offset(obj, (da & IOSUPER_MASK));
721 }
722 bytes *= nent;
723 }
724 memset(iopgd, 0, nent * sizeof(*iopgd));
725 flush_iopgd_range(iopgd, iopgd + (nent - 1) * sizeof(*iopgd));
726out:
727 return bytes;
728}
729
730
731
732
733
734
735size_t iopgtable_clear_entry(struct iommu *obj, u32 da)
736{
737 size_t bytes;
738
739 spin_lock(&obj->page_table_lock);
740
741 bytes = iopgtable_clear_entry_core(obj, da);
742 flush_iotlb_page(obj, da);
743
744 spin_unlock(&obj->page_table_lock);
745
746 return bytes;
747}
748EXPORT_SYMBOL_GPL(iopgtable_clear_entry);
749
750static void iopgtable_clear_entry_all(struct iommu *obj)
751{
752 int i;
753
754 spin_lock(&obj->page_table_lock);
755
756 for (i = 0; i < PTRS_PER_IOPGD; i++) {
757 u32 da;
758 u32 *iopgd;
759
760 da = i << IOPGD_SHIFT;
761 iopgd = iopgd_offset(obj, da);
762
763 if (!*iopgd)
764 continue;
765
766 if (iopgd_is_table(*iopgd))
767 iopte_free(iopte_offset(iopgd, 0));
768
769 *iopgd = 0;
770 flush_iopgd_range(iopgd, iopgd);
771 }
772
773 flush_iotlb_all(obj);
774
775 spin_unlock(&obj->page_table_lock);
776}
777
778
779
780
781static irqreturn_t iommu_fault_handler(int irq, void *data)
782{
783 u32 stat, da;
784 u32 *iopgd, *iopte;
785 int err = -EIO;
786 struct iommu *obj = data;
787
788 if (!obj->refcount)
789 return IRQ_NONE;
790
791
792 if (obj->isr)
793 err = obj->isr(obj);
794
795 if (!err)
796 return IRQ_HANDLED;
797
798 clk_enable(obj->clk);
799 stat = iommu_report_fault(obj, &da);
800 clk_disable(obj->clk);
801 if (!stat)
802 return IRQ_HANDLED;
803
804 iommu_disable(obj);
805
806 iopgd = iopgd_offset(obj, da);
807
808 if (!iopgd_is_table(*iopgd)) {
809 dev_err(obj->dev, "%s: da:%08x pgd:%p *pgd:%08x\n", __func__,
810 da, iopgd, *iopgd);
811 return IRQ_NONE;
812 }
813
814 iopte = iopte_offset(iopgd, da);
815
816 dev_err(obj->dev, "%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n",
817 __func__, da, iopgd, *iopgd, iopte, *iopte);
818
819 return IRQ_NONE;
820}
821
822static int device_match_by_alias(struct device *dev, void *data)
823{
824 struct iommu *obj = to_iommu(dev);
825 const char *name = data;
826
827 pr_debug("%s: %s %s\n", __func__, obj->name, name);
828
829 return strcmp(obj->name, name) == 0;
830}
831
832
833
834
835
836
837
838int iommu_set_da_range(struct iommu *obj, u32 start, u32 end)
839{
840
841 if (!obj)
842 return -EFAULT;
843
844 if (end < start || !PAGE_ALIGN(start | end))
845 return -EINVAL;
846
847 obj->da_start = start;
848 obj->da_end = end;
849
850 return 0;
851}
852EXPORT_SYMBOL_GPL(iommu_set_da_range);
853
854
855
856
857
858struct iommu *iommu_get(const char *name)
859{
860 int err = -ENOMEM;
861 struct device *dev;
862 struct iommu *obj;
863
864 dev = driver_find_device(&omap_iommu_driver.driver, NULL, (void *)name,
865 device_match_by_alias);
866 if (!dev)
867 return ERR_PTR(-ENODEV);
868
869 obj = to_iommu(dev);
870
871 mutex_lock(&obj->iommu_lock);
872
873 if (obj->refcount++ == 0) {
874 err = iommu_enable(obj);
875 if (err)
876 goto err_enable;
877 flush_iotlb_all(obj);
878 }
879
880 if (!try_module_get(obj->owner))
881 goto err_module;
882
883 mutex_unlock(&obj->iommu_lock);
884
885 dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
886 return obj;
887
888err_module:
889 if (obj->refcount == 1)
890 iommu_disable(obj);
891err_enable:
892 obj->refcount--;
893 mutex_unlock(&obj->iommu_lock);
894 return ERR_PTR(err);
895}
896EXPORT_SYMBOL_GPL(iommu_get);
897
898
899
900
901
902void iommu_put(struct iommu *obj)
903{
904 if (!obj || IS_ERR(obj))
905 return;
906
907 mutex_lock(&obj->iommu_lock);
908
909 if (--obj->refcount == 0)
910 iommu_disable(obj);
911
912 module_put(obj->owner);
913
914 mutex_unlock(&obj->iommu_lock);
915
916 dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
917}
918EXPORT_SYMBOL_GPL(iommu_put);
919
920
921
922
923static int __devinit omap_iommu_probe(struct platform_device *pdev)
924{
925 int err = -ENODEV;
926 void *p;
927 int irq;
928 struct iommu *obj;
929 struct resource *res;
930 struct iommu_platform_data *pdata = pdev->dev.platform_data;
931
932 if (pdev->num_resources != 2)
933 return -EINVAL;
934
935 obj = kzalloc(sizeof(*obj) + MMU_REG_SIZE, GFP_KERNEL);
936 if (!obj)
937 return -ENOMEM;
938
939 obj->clk = clk_get(&pdev->dev, pdata->clk_name);
940 if (IS_ERR(obj->clk))
941 goto err_clk;
942
943 obj->nr_tlb_entries = pdata->nr_tlb_entries;
944 obj->name = pdata->name;
945 obj->dev = &pdev->dev;
946 obj->ctx = (void *)obj + sizeof(*obj);
947 obj->da_start = pdata->da_start;
948 obj->da_end = pdata->da_end;
949
950 mutex_init(&obj->iommu_lock);
951 mutex_init(&obj->mmap_lock);
952 spin_lock_init(&obj->page_table_lock);
953 INIT_LIST_HEAD(&obj->mmap);
954
955 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
956 if (!res) {
957 err = -ENODEV;
958 goto err_mem;
959 }
960 obj->regbase = ioremap(res->start, resource_size(res));
961 if (!obj->regbase) {
962 err = -ENOMEM;
963 goto err_mem;
964 }
965
966 res = request_mem_region(res->start, resource_size(res),
967 dev_name(&pdev->dev));
968 if (!res) {
969 err = -EIO;
970 goto err_mem;
971 }
972
973 irq = platform_get_irq(pdev, 0);
974 if (irq < 0) {
975 err = -ENODEV;
976 goto err_irq;
977 }
978 err = request_irq(irq, iommu_fault_handler, IRQF_SHARED,
979 dev_name(&pdev->dev), obj);
980 if (err < 0)
981 goto err_irq;
982 platform_set_drvdata(pdev, obj);
983
984 p = (void *)__get_free_pages(GFP_KERNEL, get_order(IOPGD_TABLE_SIZE));
985 if (!p) {
986 err = -ENOMEM;
987 goto err_pgd;
988 }
989 memset(p, 0, IOPGD_TABLE_SIZE);
990 clean_dcache_area(p, IOPGD_TABLE_SIZE);
991 obj->iopgd = p;
992
993 BUG_ON(!IS_ALIGNED((unsigned long)obj->iopgd, IOPGD_TABLE_SIZE));
994
995 dev_info(&pdev->dev, "%s registered\n", obj->name);
996 return 0;
997
998err_pgd:
999 free_irq(irq, obj);
1000err_irq:
1001 release_mem_region(res->start, resource_size(res));
1002 iounmap(obj->regbase);
1003err_mem:
1004 clk_put(obj->clk);
1005err_clk:
1006 kfree(obj);
1007 return err;
1008}
1009
1010static int __devexit omap_iommu_remove(struct platform_device *pdev)
1011{
1012 int irq;
1013 struct resource *res;
1014 struct iommu *obj = platform_get_drvdata(pdev);
1015
1016 platform_set_drvdata(pdev, NULL);
1017
1018 iopgtable_clear_entry_all(obj);
1019 free_pages((unsigned long)obj->iopgd, get_order(IOPGD_TABLE_SIZE));
1020
1021 irq = platform_get_irq(pdev, 0);
1022 free_irq(irq, obj);
1023 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1024 release_mem_region(res->start, resource_size(res));
1025 iounmap(obj->regbase);
1026
1027 clk_put(obj->clk);
1028 dev_info(&pdev->dev, "%s removed\n", obj->name);
1029 kfree(obj);
1030 return 0;
1031}
1032
1033static struct platform_driver omap_iommu_driver = {
1034 .probe = omap_iommu_probe,
1035 .remove = __devexit_p(omap_iommu_remove),
1036 .driver = {
1037 .name = "omap-iommu",
1038 },
1039};
1040
1041static void iopte_cachep_ctor(void *iopte)
1042{
1043 clean_dcache_area(iopte, IOPTE_TABLE_SIZE);
1044}
1045
1046static int __init omap_iommu_init(void)
1047{
1048 struct kmem_cache *p;
1049 const unsigned long flags = SLAB_HWCACHE_ALIGN;
1050 size_t align = 1 << 10;
1051
1052 p = kmem_cache_create("iopte_cache", IOPTE_TABLE_SIZE, align, flags,
1053 iopte_cachep_ctor);
1054 if (!p)
1055 return -ENOMEM;
1056 iopte_cachep = p;
1057
1058 return platform_driver_register(&omap_iommu_driver);
1059}
1060module_init(omap_iommu_init);
1061
1062static void __exit omap_iommu_exit(void)
1063{
1064 kmem_cache_destroy(iopte_cachep);
1065
1066 platform_driver_unregister(&omap_iommu_driver);
1067}
1068module_exit(omap_iommu_exit);
1069
1070MODULE_DESCRIPTION("omap iommu: tlb and pagetable primitives");
1071MODULE_ALIAS("platform:omap-iommu");
1072MODULE_AUTHOR("Hiroshi DOYU, Paul Mundt and Toshihiro Kobayashi");
1073MODULE_LICENSE("GPL v2");
1074