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USB: keyspan: pull in one indent level
[linux-2.6/btrfs-unstable.git] / drivers / iommu / exynos-iommu.c
blob238a3caa949aff42981feaa22aae04227d85998b
1 /* linux/drivers/iommu/exynos_iommu.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
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 version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #ifdef CONFIG_EXYNOS_IOMMU_DEBUG
12 #define DEBUG
13 #endif
14
15 #include <linux/io.h>
16 #include <linux/interrupt.h>
17 #include <linux/platform_device.h>
18 #include <linux/slab.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/clk.h>
21 #include <linux/err.h>
22 #include <linux/mm.h>
23 #include <linux/iommu.h>
24 #include <linux/errno.h>
25 #include <linux/list.h>
26 #include <linux/memblock.h>
27 #include <linux/export.h>
28
29 #include <asm/cacheflush.h>
30 #include <asm/pgtable.h>
31
32 #include <mach/sysmmu.h>
33
34 /* We does not consider super section mapping (16MB) */
35 #define SECT_ORDER 20
36 #define LPAGE_ORDER 16
37 #define SPAGE_ORDER 12
38
39 #define SECT_SIZE (1 << SECT_ORDER)
40 #define LPAGE_SIZE (1 << LPAGE_ORDER)
41 #define SPAGE_SIZE (1 << SPAGE_ORDER)
42
43 #define SECT_MASK (~(SECT_SIZE - 1))
44 #define LPAGE_MASK (~(LPAGE_SIZE - 1))
45 #define SPAGE_MASK (~(SPAGE_SIZE - 1))
46
47 #define lv1ent_fault(sent) (((*(sent) & 3) == 0) || ((*(sent) & 3) == 3))
48 #define lv1ent_page(sent) ((*(sent) & 3) == 1)
49 #define lv1ent_section(sent) ((*(sent) & 3) == 2)
50
51 #define lv2ent_fault(pent) ((*(pent) & 3) == 0)
52 #define lv2ent_small(pent) ((*(pent) & 2) == 2)
53 #define lv2ent_large(pent) ((*(pent) & 3) == 1)
54
55 #define section_phys(sent) (*(sent) & SECT_MASK)
56 #define section_offs(iova) ((iova) & 0xFFFFF)
57 #define lpage_phys(pent) (*(pent) & LPAGE_MASK)
58 #define lpage_offs(iova) ((iova) & 0xFFFF)
59 #define spage_phys(pent) (*(pent) & SPAGE_MASK)
60 #define spage_offs(iova) ((iova) & 0xFFF)
61
62 #define lv1ent_offset(iova) ((iova) >> SECT_ORDER)
63 #define lv2ent_offset(iova) (((iova) & 0xFF000) >> SPAGE_ORDER)
64
65 #define NUM_LV1ENTRIES 4096
66 #define NUM_LV2ENTRIES 256
67
68 #define LV2TABLE_SIZE (NUM_LV2ENTRIES * sizeof(long))
69
70 #define SPAGES_PER_LPAGE (LPAGE_SIZE / SPAGE_SIZE)
71
72 #define lv2table_base(sent) (*(sent) & 0xFFFFFC00)
73
74 #define mk_lv1ent_sect(pa) ((pa) | 2)
75 #define mk_lv1ent_page(pa) ((pa) | 1)
76 #define mk_lv2ent_lpage(pa) ((pa) | 1)
77 #define mk_lv2ent_spage(pa) ((pa) | 2)
78
79 #define CTRL_ENABLE 0x5
80 #define CTRL_BLOCK 0x7
81 #define CTRL_DISABLE 0x0
82
83 #define REG_MMU_CTRL 0x000
84 #define REG_MMU_CFG 0x004
85 #define REG_MMU_STATUS 0x008
86 #define REG_MMU_FLUSH 0x00C
87 #define REG_MMU_FLUSH_ENTRY 0x010
88 #define REG_PT_BASE_ADDR 0x014
89 #define REG_INT_STATUS 0x018
90 #define REG_INT_CLEAR 0x01C
91
92 #define REG_PAGE_FAULT_ADDR 0x024
93 #define REG_AW_FAULT_ADDR 0x028
94 #define REG_AR_FAULT_ADDR 0x02C
95 #define REG_DEFAULT_SLAVE_ADDR 0x030
96
97 #define REG_MMU_VERSION 0x034
98
99 #define REG_PB0_SADDR 0x04C
100 #define REG_PB0_EADDR 0x050
101 #define REG_PB1_SADDR 0x054
102 #define REG_PB1_EADDR 0x058
103
104 static unsigned long *section_entry(unsigned long *pgtable, unsigned long iova)
105 {
106 return pgtable + lv1ent_offset(iova);
107 }
108
109 static unsigned long *page_entry(unsigned long *sent, unsigned long iova)
110 {
111 return (unsigned long *)__va(lv2table_base(sent)) + lv2ent_offset(iova);
112 }
113
114 enum exynos_sysmmu_inttype {
115 SYSMMU_PAGEFAULT,
116 SYSMMU_AR_MULTIHIT,
117 SYSMMU_AW_MULTIHIT,
118 SYSMMU_BUSERROR,
119 SYSMMU_AR_SECURITY,
120 SYSMMU_AR_ACCESS,
121 SYSMMU_AW_SECURITY,
122 SYSMMU_AW_PROTECTION, /* 7 */
123 SYSMMU_FAULT_UNKNOWN,
124 SYSMMU_FAULTS_NUM
125 };
126
127 /*
128 * @itype: type of fault.
129 * @pgtable_base: the physical address of page table base. This is 0 if @itype
130 * is SYSMMU_BUSERROR.
131 * @fault_addr: the device (virtual) address that the System MMU tried to
132 * translated. This is 0 if @itype is SYSMMU_BUSERROR.
133 */
134 typedef int (*sysmmu_fault_handler_t)(enum exynos_sysmmu_inttype itype,
135 unsigned long pgtable_base, unsigned long fault_addr);
136
137 static unsigned short fault_reg_offset[SYSMMU_FAULTS_NUM] = {
138 REG_PAGE_FAULT_ADDR,
139 REG_AR_FAULT_ADDR,
140 REG_AW_FAULT_ADDR,
141 REG_DEFAULT_SLAVE_ADDR,
142 REG_AR_FAULT_ADDR,
143 REG_AR_FAULT_ADDR,
144 REG_AW_FAULT_ADDR,
145 REG_AW_FAULT_ADDR
146 };
147
148 static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = {
149 "PAGE FAULT",
150 "AR MULTI-HIT FAULT",
151 "AW MULTI-HIT FAULT",
152 "BUS ERROR",
153 "AR SECURITY PROTECTION FAULT",
154 "AR ACCESS PROTECTION FAULT",
155 "AW SECURITY PROTECTION FAULT",
156 "AW ACCESS PROTECTION FAULT",
157 "UNKNOWN FAULT"
158 };
159
160 struct exynos_iommu_domain {
161 struct list_head clients; /* list of sysmmu_drvdata.node */
162 unsigned long *pgtable; /* lv1 page table, 16KB */
163 short *lv2entcnt; /* free lv2 entry counter for each section */
164 spinlock_t lock; /* lock for this structure */
165 spinlock_t pgtablelock; /* lock for modifying page table @ pgtable */
166 };
167
168 struct sysmmu_drvdata {
169 struct list_head node; /* entry of exynos_iommu_domain.clients */
170 struct device *sysmmu; /* System MMU's device descriptor */
171 struct device *dev; /* Owner of system MMU */
172 char *dbgname;
173 int nsfrs;
174 void __iomem **sfrbases;
175 struct clk *clk[2];
176 int activations;
177 rwlock_t lock;
178 struct iommu_domain *domain;
179 sysmmu_fault_handler_t fault_handler;
180 unsigned long pgtable;
181 };
182
183 static bool set_sysmmu_active(struct sysmmu_drvdata *data)
184 {
185 /* return true if the System MMU was not active previously
186 and it needs to be initialized */
187 return ++data->activations == 1;
188 }
189
190 static bool set_sysmmu_inactive(struct sysmmu_drvdata *data)
191 {
192 /* return true if the System MMU is needed to be disabled */
193 BUG_ON(data->activations < 1);
194 return --data->activations == 0;
195 }
196
197 static bool is_sysmmu_active(struct sysmmu_drvdata *data)
198 {
199 return data->activations > 0;
200 }
201
202 static void sysmmu_unblock(void __iomem *sfrbase)
203 {
204 __raw_writel(CTRL_ENABLE, sfrbase + REG_MMU_CTRL);
205 }
206
207 static bool sysmmu_block(void __iomem *sfrbase)
208 {
209 int i = 120;
210
211 __raw_writel(CTRL_BLOCK, sfrbase + REG_MMU_CTRL);
212 while ((i > 0) && !(__raw_readl(sfrbase + REG_MMU_STATUS) & 1))
213 --i;
214
215 if (!(__raw_readl(sfrbase + REG_MMU_STATUS) & 1)) {
216 sysmmu_unblock(sfrbase);
217 return false;
218 }
219
220 return true;
221 }
222
223 static void __sysmmu_tlb_invalidate(void __iomem *sfrbase)
224 {
225 __raw_writel(0x1, sfrbase + REG_MMU_FLUSH);
226 }
227
228 static void __sysmmu_tlb_invalidate_entry(void __iomem *sfrbase,
229 unsigned long iova)
230 {
231 __raw_writel((iova & SPAGE_MASK) | 1, sfrbase + REG_MMU_FLUSH_ENTRY);
232 }
233
234 static void __sysmmu_set_ptbase(void __iomem *sfrbase,
235 unsigned long pgd)
236 {
237 __raw_writel(0x1, sfrbase + REG_MMU_CFG); /* 16KB LV1, LRU */
238 __raw_writel(pgd, sfrbase + REG_PT_BASE_ADDR);
239
240 __sysmmu_tlb_invalidate(sfrbase);
241 }
242
243 static void __sysmmu_set_prefbuf(void __iomem *sfrbase, unsigned long base,
244 unsigned long size, int idx)
245 {
246 __raw_writel(base, sfrbase + REG_PB0_SADDR + idx * 8);
247 __raw_writel(size - 1 + base, sfrbase + REG_PB0_EADDR + idx * 8);
248 }
249
250 void exynos_sysmmu_set_prefbuf(struct device *dev,
251 unsigned long base0, unsigned long size0,
252 unsigned long base1, unsigned long size1)
253 {
254 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
255 unsigned long flags;
256 int i;
257
258 BUG_ON((base0 + size0) <= base0);
259 BUG_ON((size1 > 0) && ((base1 + size1) <= base1));
260
261 read_lock_irqsave(&data->lock, flags);
262 if (!is_sysmmu_active(data))
263 goto finish;
264
265 for (i = 0; i < data->nsfrs; i++) {
266 if ((readl(data->sfrbases[i] + REG_MMU_VERSION) >> 28) == 3) {
267 if (!sysmmu_block(data->sfrbases[i]))
268 continue;
269
270 if (size1 == 0) {
271 if (size0 <= SZ_128K) {
272 base1 = base0;
273 size1 = size0;
274 } else {
275 size1 = size0 -
276 ALIGN(size0 / 2, SZ_64K);
277 size0 = size0 - size1;
278 base1 = base0 + size0;
279 }
280 }
281
282 __sysmmu_set_prefbuf(
283 data->sfrbases[i], base0, size0, 0);
284 __sysmmu_set_prefbuf(
285 data->sfrbases[i], base1, size1, 1);
286
287 sysmmu_unblock(data->sfrbases[i]);
288 }
289 }
290 finish:
291 read_unlock_irqrestore(&data->lock, flags);
292 }
293
294 static void __set_fault_handler(struct sysmmu_drvdata *data,
295 sysmmu_fault_handler_t handler)
296 {
297 unsigned long flags;
298
299 write_lock_irqsave(&data->lock, flags);
300 data->fault_handler = handler;
301 write_unlock_irqrestore(&data->lock, flags);
302 }
303
304 void exynos_sysmmu_set_fault_handler(struct device *dev,
305 sysmmu_fault_handler_t handler)
306 {
307 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
308
309 __set_fault_handler(data, handler);
310 }
311
312 static int default_fault_handler(enum exynos_sysmmu_inttype itype,
313 unsigned long pgtable_base, unsigned long fault_addr)
314 {
315 unsigned long *ent;
316
317 if ((itype >= SYSMMU_FAULTS_NUM) || (itype < SYSMMU_PAGEFAULT))
318 itype = SYSMMU_FAULT_UNKNOWN;
319
320 pr_err("%s occurred at 0x%lx(Page table base: 0x%lx)\n",
321 sysmmu_fault_name[itype], fault_addr, pgtable_base);
322
323 ent = section_entry(__va(pgtable_base), fault_addr);
324 pr_err("\tLv1 entry: 0x%lx\n", *ent);
325
326 if (lv1ent_page(ent)) {
327 ent = page_entry(ent, fault_addr);
328 pr_err("\t Lv2 entry: 0x%lx\n", *ent);
329 }
330
331 pr_err("Generating Kernel OOPS... because it is unrecoverable.\n");
332
333 BUG();
334
335 return 0;
336 }
337
338 static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
339 {
340 /* SYSMMU is in blocked when interrupt occurred. */
341 struct sysmmu_drvdata *data = dev_id;
342 struct resource *irqres;
343 struct platform_device *pdev;
344 enum exynos_sysmmu_inttype itype;
345 unsigned long addr = -1;
346
347 int i, ret = -ENOSYS;
348
349 read_lock(&data->lock);
350
351 WARN_ON(!is_sysmmu_active(data));
352
353 pdev = to_platform_device(data->sysmmu);
354 for (i = 0; i < (pdev->num_resources / 2); i++) {
355 irqres = platform_get_resource(pdev, IORESOURCE_IRQ, i);
356 if (irqres && ((int)irqres->start == irq))
357 break;
358 }
359
360 if (i == pdev->num_resources) {
361 itype = SYSMMU_FAULT_UNKNOWN;
362 } else {
363 itype = (enum exynos_sysmmu_inttype)
364 __ffs(__raw_readl(data->sfrbases[i] + REG_INT_STATUS));
365 if (WARN_ON(!((itype >= 0) && (itype < SYSMMU_FAULT_UNKNOWN))))
366 itype = SYSMMU_FAULT_UNKNOWN;
367 else
368 addr = __raw_readl(
369 data->sfrbases[i] + fault_reg_offset[itype]);
370 }
371
372 if (data->domain)
373 ret = report_iommu_fault(data->domain, data->dev,
374 addr, itype);
375
376 if ((ret == -ENOSYS) && data->fault_handler) {
377 unsigned long base = data->pgtable;
378 if (itype != SYSMMU_FAULT_UNKNOWN)
379 base = __raw_readl(
380 data->sfrbases[i] + REG_PT_BASE_ADDR);
381 ret = data->fault_handler(itype, base, addr);
382 }
383
384 if (!ret && (itype != SYSMMU_FAULT_UNKNOWN))
385 __raw_writel(1 << itype, data->sfrbases[i] + REG_INT_CLEAR);
386 else
387 dev_dbg(data->sysmmu, "(%s) %s is not handled.\n",
388 data->dbgname, sysmmu_fault_name[itype]);
389
390 if (itype != SYSMMU_FAULT_UNKNOWN)
391 sysmmu_unblock(data->sfrbases[i]);
392
393 read_unlock(&data->lock);
394
395 return IRQ_HANDLED;
396 }
397
398 static bool __exynos_sysmmu_disable(struct sysmmu_drvdata *data)
399 {
400 unsigned long flags;
401 bool disabled = false;
402 int i;
403
404 write_lock_irqsave(&data->lock, flags);
405
406 if (!set_sysmmu_inactive(data))
407 goto finish;
408
409 for (i = 0; i < data->nsfrs; i++)
410 __raw_writel(CTRL_DISABLE, data->sfrbases[i] + REG_MMU_CTRL);
411
412 if (data->clk[1])
413 clk_disable(data->clk[1]);
414 if (data->clk[0])
415 clk_disable(data->clk[0]);
416
417 disabled = true;
418 data->pgtable = 0;
419 data->domain = NULL;
420 finish:
421 write_unlock_irqrestore(&data->lock, flags);
422
423 if (disabled)
424 dev_dbg(data->sysmmu, "(%s) Disabled\n", data->dbgname);
425 else
426 dev_dbg(data->sysmmu, "(%s) %d times left to be disabled\n",
427 data->dbgname, data->activations);
428
429 return disabled;
430 }
431
432 /* __exynos_sysmmu_enable: Enables System MMU
433 *
434 * returns -error if an error occurred and System MMU is not enabled,
435 * 0 if the System MMU has been just enabled and 1 if System MMU was already
436 * enabled before.
437 */
438 static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data,
439 unsigned long pgtable, struct iommu_domain *domain)
440 {
441 int i, ret = 0;
442 unsigned long flags;
443
444 write_lock_irqsave(&data->lock, flags);
445
446 if (!set_sysmmu_active(data)) {
447 if (WARN_ON(pgtable != data->pgtable)) {
448 ret = -EBUSY;
449 set_sysmmu_inactive(data);
450 } else {
451 ret = 1;
452 }
453
454 dev_dbg(data->sysmmu, "(%s) Already enabled\n", data->dbgname);
455 goto finish;
456 }
457
458 if (data->clk[0])
459 clk_enable(data->clk[0]);
460 if (data->clk[1])
461 clk_enable(data->clk[1]);
462
463 data->pgtable = pgtable;
464
465 for (i = 0; i < data->nsfrs; i++) {
466 __sysmmu_set_ptbase(data->sfrbases[i], pgtable);
467
468 if ((readl(data->sfrbases[i] + REG_MMU_VERSION) >> 28) == 3) {
469 /* System MMU version is 3.x */
470 __raw_writel((1 << 12) | (2 << 28),
471 data->sfrbases[i] + REG_MMU_CFG);
472 __sysmmu_set_prefbuf(data->sfrbases[i], 0, -1, 0);
473 __sysmmu_set_prefbuf(data->sfrbases[i], 0, -1, 1);
474 }
475
476 __raw_writel(CTRL_ENABLE, data->sfrbases[i] + REG_MMU_CTRL);
477 }
478
479 data->domain = domain;
480
481 dev_dbg(data->sysmmu, "(%s) Enabled\n", data->dbgname);
482 finish:
483 write_unlock_irqrestore(&data->lock, flags);
484
485 return ret;
486 }
487
488 int exynos_sysmmu_enable(struct device *dev, unsigned long pgtable)
489 {
490 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
491 int ret;
492
493 BUG_ON(!memblock_is_memory(pgtable));
494
495 ret = pm_runtime_get_sync(data->sysmmu);
496 if (ret < 0) {
497 dev_dbg(data->sysmmu, "(%s) Failed to enable\n", data->dbgname);
498 return ret;
499 }
500
501 ret = __exynos_sysmmu_enable(data, pgtable, NULL);
502 if (WARN_ON(ret < 0)) {
503 pm_runtime_put(data->sysmmu);
504 dev_err(data->sysmmu,
505 "(%s) Already enabled with page table %#lx\n",
506 data->dbgname, data->pgtable);
507 } else {
508 data->dev = dev;
509 }
510
511 return ret;
512 }
513
514 static bool exynos_sysmmu_disable(struct device *dev)
515 {
516 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
517 bool disabled;
518
519 disabled = __exynos_sysmmu_disable(data);
520 pm_runtime_put(data->sysmmu);
521
522 return disabled;
523 }
524
525 static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova)
526 {
527 unsigned long flags;
528 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
529
530 read_lock_irqsave(&data->lock, flags);
531
532 if (is_sysmmu_active(data)) {
533 int i;
534 for (i = 0; i < data->nsfrs; i++) {
535 if (sysmmu_block(data->sfrbases[i])) {
536 __sysmmu_tlb_invalidate_entry(
537 data->sfrbases[i], iova);
538 sysmmu_unblock(data->sfrbases[i]);
539 }
540 }
541 } else {
542 dev_dbg(data->sysmmu,
543 "(%s) Disabled. Skipping invalidating TLB.\n",
544 data->dbgname);
545 }
546
547 read_unlock_irqrestore(&data->lock, flags);
548 }
549
550 void exynos_sysmmu_tlb_invalidate(struct device *dev)
551 {
552 unsigned long flags;
553 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
554
555 read_lock_irqsave(&data->lock, flags);
556
557 if (is_sysmmu_active(data)) {
558 int i;
559 for (i = 0; i < data->nsfrs; i++) {
560 if (sysmmu_block(data->sfrbases[i])) {
561 __sysmmu_tlb_invalidate(data->sfrbases[i]);
562 sysmmu_unblock(data->sfrbases[i]);
563 }
564 }
565 } else {
566 dev_dbg(data->sysmmu,
567 "(%s) Disabled. Skipping invalidating TLB.\n",
568 data->dbgname);
569 }
570
571 read_unlock_irqrestore(&data->lock, flags);
572 }
573
574 static int exynos_sysmmu_probe(struct platform_device *pdev)
575 {
576 int i, ret;
577 struct device *dev;
578 struct sysmmu_drvdata *data;
579
580 dev = &pdev->dev;
581
582 data = kzalloc(sizeof(*data), GFP_KERNEL);
583 if (!data) {
584 dev_dbg(dev, "Not enough memory\n");
585 ret = -ENOMEM;
586 goto err_alloc;
587 }
588
589 ret = dev_set_drvdata(dev, data);
590 if (ret) {
591 dev_dbg(dev, "Unabled to initialize driver data\n");
592 goto err_init;
593 }
594
595 data->nsfrs = pdev->num_resources / 2;
596 data->sfrbases = kmalloc(sizeof(*data->sfrbases) * data->nsfrs,
597 GFP_KERNEL);
598 if (data->sfrbases == NULL) {
599 dev_dbg(dev, "Not enough memory\n");
600 ret = -ENOMEM;
601 goto err_init;
602 }
603
604 for (i = 0; i < data->nsfrs; i++) {
605 struct resource *res;
606 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
607 if (!res) {
608 dev_dbg(dev, "Unable to find IOMEM region\n");
609 ret = -ENOENT;
610 goto err_res;
611 }
612
613 data->sfrbases[i] = ioremap(res->start, resource_size(res));
614 if (!data->sfrbases[i]) {
615 dev_dbg(dev, "Unable to map IOMEM @ PA:%#x\n",
616 res->start);
617 ret = -ENOENT;
618 goto err_res;
619 }
620 }
621
622 for (i = 0; i < data->nsfrs; i++) {
623 ret = platform_get_irq(pdev, i);
624 if (ret <= 0) {
625 dev_dbg(dev, "Unable to find IRQ resource\n");
626 goto err_irq;
627 }
628
629 ret = request_irq(ret, exynos_sysmmu_irq, 0,
630 dev_name(dev), data);
631 if (ret) {
632 dev_dbg(dev, "Unabled to register interrupt handler\n");
633 goto err_irq;
634 }
635 }
636
637 if (dev_get_platdata(dev)) {
638 char *deli, *beg;
639 struct sysmmu_platform_data *platdata = dev_get_platdata(dev);
640
641 beg = platdata->clockname;
642
643 for (deli = beg; (*deli != '\0') && (*deli != ','); deli++)
644 /* NOTHING */;
645
646 if (*deli == '\0')
647 deli = NULL;
648 else
649 *deli = '\0';
650
651 data->clk[0] = clk_get(dev, beg);
652 if (IS_ERR(data->clk[0])) {
653 data->clk[0] = NULL;
654 dev_dbg(dev, "No clock descriptor registered\n");
655 }
656
657 if (data->clk[0] && deli) {
658 *deli = ',';
659 data->clk[1] = clk_get(dev, deli + 1);
660 if (IS_ERR(data->clk[1]))
661 data->clk[1] = NULL;
662 }
663
664 data->dbgname = platdata->dbgname;
665 }
666
667 data->sysmmu = dev;
668 rwlock_init(&data->lock);
669 INIT_LIST_HEAD(&data->node);
670
671 __set_fault_handler(data, &default_fault_handler);
672
673 if (dev->parent)
674 pm_runtime_enable(dev);
675
676 dev_dbg(dev, "(%s) Initialized\n", data->dbgname);
677 return 0;
678 err_irq:
679 while (i-- > 0) {
680 int irq;
681
682 irq = platform_get_irq(pdev, i);
683 free_irq(irq, data);
684 }
685 err_res:
686 while (data->nsfrs-- > 0)
687 iounmap(data->sfrbases[data->nsfrs]);
688 kfree(data->sfrbases);
689 err_init:
690 kfree(data);
691 err_alloc:
692 dev_err(dev, "Failed to initialize\n");
693 return ret;
694 }
695
696 static struct platform_driver exynos_sysmmu_driver = {
697 .probe = exynos_sysmmu_probe,
698 .driver = {
699 .owner = THIS_MODULE,
700 .name = "exynos-sysmmu",
701 }
702 };
703
704 static inline void pgtable_flush(void *vastart, void *vaend)
705 {
706 dmac_flush_range(vastart, vaend);
707 outer_flush_range(virt_to_phys(vastart),
708 virt_to_phys(vaend));
709 }
710
711 static int exynos_iommu_domain_init(struct iommu_domain *domain)
712 {
713 struct exynos_iommu_domain *priv;
714
715 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
716 if (!priv)
717 return -ENOMEM;
718
719 priv->pgtable = (unsigned long *)__get_free_pages(
720 GFP_KERNEL | __GFP_ZERO, 2);
721 if (!priv->pgtable)
722 goto err_pgtable;
723
724 priv->lv2entcnt = (short *)__get_free_pages(
725 GFP_KERNEL | __GFP_ZERO, 1);
726 if (!priv->lv2entcnt)
727 goto err_counter;
728
729 pgtable_flush(priv->pgtable, priv->pgtable + NUM_LV1ENTRIES);
730
731 spin_lock_init(&priv->lock);
732 spin_lock_init(&priv->pgtablelock);
733 INIT_LIST_HEAD(&priv->clients);
734
735 domain->geometry.aperture_start = 0;
736 domain->geometry.aperture_end = ~0UL;
737 domain->geometry.force_aperture = true;
738
739 domain->priv = priv;
740 return 0;
741
742 err_counter:
743 free_pages((unsigned long)priv->pgtable, 2);
744 err_pgtable:
745 kfree(priv);
746 return -ENOMEM;
747 }
748
749 static void exynos_iommu_domain_destroy(struct iommu_domain *domain)
750 {
751 struct exynos_iommu_domain *priv = domain->priv;
752 struct sysmmu_drvdata *data;
753 unsigned long flags;
754 int i;
755
756 WARN_ON(!list_empty(&priv->clients));
757
758 spin_lock_irqsave(&priv->lock, flags);
759
760 list_for_each_entry(data, &priv->clients, node) {
761 while (!exynos_sysmmu_disable(data->dev))
762 ; /* until System MMU is actually disabled */
763 }
764
765 spin_unlock_irqrestore(&priv->lock, flags);
766
767 for (i = 0; i < NUM_LV1ENTRIES; i++)
768 if (lv1ent_page(priv->pgtable + i))
769 kfree(__va(lv2table_base(priv->pgtable + i)));
770
771 free_pages((unsigned long)priv->pgtable, 2);
772 free_pages((unsigned long)priv->lv2entcnt, 1);
773 kfree(domain->priv);
774 domain->priv = NULL;
775 }
776
777 static int exynos_iommu_attach_device(struct iommu_domain *domain,
778 struct device *dev)
779 {
780 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
781 struct exynos_iommu_domain *priv = domain->priv;
782 unsigned long flags;
783 int ret;
784
785 ret = pm_runtime_get_sync(data->sysmmu);
786 if (ret < 0)
787 return ret;
788
789 ret = 0;
790
791 spin_lock_irqsave(&priv->lock, flags);
792
793 ret = __exynos_sysmmu_enable(data, __pa(priv->pgtable), domain);
794
795 if (ret == 0) {
796 /* 'data->node' must not be appeared in priv->clients */
797 BUG_ON(!list_empty(&data->node));
798 data->dev = dev;
799 list_add_tail(&data->node, &priv->clients);
800 }
801
802 spin_unlock_irqrestore(&priv->lock, flags);
803
804 if (ret < 0) {
805 dev_err(dev, "%s: Failed to attach IOMMU with pgtable %#lx\n",
806 __func__, __pa(priv->pgtable));
807 pm_runtime_put(data->sysmmu);
808 } else if (ret > 0) {
809 dev_dbg(dev, "%s: IOMMU with pgtable 0x%lx already attached\n",
810 __func__, __pa(priv->pgtable));
811 } else {
812 dev_dbg(dev, "%s: Attached new IOMMU with pgtable 0x%lx\n",
813 __func__, __pa(priv->pgtable));
814 }
815
816 return ret;
817 }
818
819 static void exynos_iommu_detach_device(struct iommu_domain *domain,
820 struct device *dev)
821 {
822 struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
823 struct exynos_iommu_domain *priv = domain->priv;
824 struct list_head *pos;
825 unsigned long flags;
826 bool found = false;
827
828 spin_lock_irqsave(&priv->lock, flags);
829
830 list_for_each(pos, &priv->clients) {
831 if (list_entry(pos, struct sysmmu_drvdata, node) == data) {
832 found = true;
833 break;
834 }
835 }
836
837 if (!found)
838 goto finish;
839
840 if (__exynos_sysmmu_disable(data)) {
841 dev_dbg(dev, "%s: Detached IOMMU with pgtable %#lx\n",
842 __func__, __pa(priv->pgtable));
843 list_del_init(&data->node);
844
845 } else {
846 dev_dbg(dev, "%s: Detaching IOMMU with pgtable %#lx delayed",
847 __func__, __pa(priv->pgtable));
848 }
849
850 finish:
851 spin_unlock_irqrestore(&priv->lock, flags);
852
853 if (found)
854 pm_runtime_put(data->sysmmu);
855 }
856
857 static unsigned long *alloc_lv2entry(unsigned long *sent, unsigned long iova,
858 short *pgcounter)
859 {
860 if (lv1ent_fault(sent)) {
861 unsigned long *pent;
862
863 pent = kzalloc(LV2TABLE_SIZE, GFP_ATOMIC);
864 BUG_ON((unsigned long)pent & (LV2TABLE_SIZE - 1));
865 if (!pent)
866 return NULL;
867
868 *sent = mk_lv1ent_page(__pa(pent));
869 *pgcounter = NUM_LV2ENTRIES;
870 pgtable_flush(pent, pent + NUM_LV2ENTRIES);
871 pgtable_flush(sent, sent + 1);
872 }
873
874 return page_entry(sent, iova);
875 }
876
877 static int lv1set_section(unsigned long *sent, phys_addr_t paddr, short *pgcnt)
878 {
879 if (lv1ent_section(sent))
880 return -EADDRINUSE;
881
882 if (lv1ent_page(sent)) {
883 if (*pgcnt != NUM_LV2ENTRIES)
884 return -EADDRINUSE;
885
886 kfree(page_entry(sent, 0));
887
888 *pgcnt = 0;
889 }
890
891 *sent = mk_lv1ent_sect(paddr);
892
893 pgtable_flush(sent, sent + 1);
894
895 return 0;
896 }
897
898 static int lv2set_page(unsigned long *pent, phys_addr_t paddr, size_t size,
899 short *pgcnt)
900 {
901 if (size == SPAGE_SIZE) {
902 if (!lv2ent_fault(pent))
903 return -EADDRINUSE;
904
905 *pent = mk_lv2ent_spage(paddr);
906 pgtable_flush(pent, pent + 1);
907 *pgcnt -= 1;
908 } else { /* size == LPAGE_SIZE */
909 int i;
910 for (i = 0; i < SPAGES_PER_LPAGE; i++, pent++) {
911 if (!lv2ent_fault(pent)) {
912 memset(pent, 0, sizeof(*pent) * i);
913 return -EADDRINUSE;
914 }
915
916 *pent = mk_lv2ent_lpage(paddr);
917 }
918 pgtable_flush(pent - SPAGES_PER_LPAGE, pent);
919 *pgcnt -= SPAGES_PER_LPAGE;
920 }
921
922 return 0;
923 }
924
925 static int exynos_iommu_map(struct iommu_domain *domain, unsigned long iova,
926 phys_addr_t paddr, size_t size, int prot)
927 {
928 struct exynos_iommu_domain *priv = domain->priv;
929 unsigned long *entry;
930 unsigned long flags;
931 int ret = -ENOMEM;
932
933 BUG_ON(priv->pgtable == NULL);
934
935 spin_lock_irqsave(&priv->pgtablelock, flags);
936
937 entry = section_entry(priv->pgtable, iova);
938
939 if (size == SECT_SIZE) {
940 ret = lv1set_section(entry, paddr,
941 &priv->lv2entcnt[lv1ent_offset(iova)]);
942 } else {
943 unsigned long *pent;
944
945 pent = alloc_lv2entry(entry, iova,
946 &priv->lv2entcnt[lv1ent_offset(iova)]);
947
948 if (!pent)
949 ret = -ENOMEM;
950 else
951 ret = lv2set_page(pent, paddr, size,
952 &priv->lv2entcnt[lv1ent_offset(iova)]);
953 }
954
955 if (ret) {
956 pr_debug("%s: Failed to map iova 0x%lx/0x%x bytes\n",
957 __func__, iova, size);
958 }
959
960 spin_unlock_irqrestore(&priv->pgtablelock, flags);
961
962 return ret;
963 }
964
965 static size_t exynos_iommu_unmap(struct iommu_domain *domain,
966 unsigned long iova, size_t size)
967 {
968 struct exynos_iommu_domain *priv = domain->priv;
969 struct sysmmu_drvdata *data;
970 unsigned long flags;
971 unsigned long *ent;
972
973 BUG_ON(priv->pgtable == NULL);
974
975 spin_lock_irqsave(&priv->pgtablelock, flags);
976
977 ent = section_entry(priv->pgtable, iova);
978
979 if (lv1ent_section(ent)) {
980 BUG_ON(size < SECT_SIZE);
981
982 *ent = 0;
983 pgtable_flush(ent, ent + 1);
984 size = SECT_SIZE;
985 goto done;
986 }
987
988 if (unlikely(lv1ent_fault(ent))) {
989 if (size > SECT_SIZE)
990 size = SECT_SIZE;
991 goto done;
992 }
993
994 /* lv1ent_page(sent) == true here */
995
996 ent = page_entry(ent, iova);
997
998 if (unlikely(lv2ent_fault(ent))) {
999 size = SPAGE_SIZE;
1000 goto done;
1001 }
1002
1003 if (lv2ent_small(ent)) {
1004 *ent = 0;
1005 size = SPAGE_SIZE;
1006 priv->lv2entcnt[lv1ent_offset(iova)] += 1;
1007 goto done;
1008 }
1009
1010 /* lv1ent_large(ent) == true here */
1011 BUG_ON(size < LPAGE_SIZE);
1012
1013 memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE);
1014
1015 size = LPAGE_SIZE;
1016 priv->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE;
1017 done:
1018 spin_unlock_irqrestore(&priv->pgtablelock, flags);
1019
1020 spin_lock_irqsave(&priv->lock, flags);
1021 list_for_each_entry(data, &priv->clients, node)
1022 sysmmu_tlb_invalidate_entry(data->dev, iova);
1023 spin_unlock_irqrestore(&priv->lock, flags);
1024
1025
1026 return size;
1027 }
1028
1029 static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *domain,
1030 unsigned long iova)
1031 {
1032 struct exynos_iommu_domain *priv = domain->priv;
1033 unsigned long *entry;
1034 unsigned long flags;
1035 phys_addr_t phys = 0;
1036
1037 spin_lock_irqsave(&priv->pgtablelock, flags);
1038
1039 entry = section_entry(priv->pgtable, iova);
1040
1041 if (lv1ent_section(entry)) {
1042 phys = section_phys(entry) + section_offs(iova);
1043 } else if (lv1ent_page(entry)) {
1044 entry = page_entry(entry, iova);
1045
1046 if (lv2ent_large(entry))
1047 phys = lpage_phys(entry) + lpage_offs(iova);
1048 else if (lv2ent_small(entry))
1049 phys = spage_phys(entry) + spage_offs(iova);
1050 }
1051
1052 spin_unlock_irqrestore(&priv->pgtablelock, flags);
1053
1054 return phys;
1055 }
1056
1057 static struct iommu_ops exynos_iommu_ops = {
1058 .domain_init = &exynos_iommu_domain_init,
1059 .domain_destroy = &exynos_iommu_domain_destroy,
1060 .attach_dev = &exynos_iommu_attach_device,
1061 .detach_dev = &exynos_iommu_detach_device,
1062 .map = &exynos_iommu_map,
1063 .unmap = &exynos_iommu_unmap,
1064 .iova_to_phys = &exynos_iommu_iova_to_phys,
1065 .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,
1066 };
1067
1068 static int __init exynos_iommu_init(void)
1069 {
1070 int ret;
1071
1072 ret = platform_driver_register(&exynos_sysmmu_driver);
1073
1074 if (ret == 0)
1075 bus_set_iommu(&platform_bus_type, &exynos_iommu_ops);
1076
1077 return ret;
1078 }
1079 subsys_initcall(exynos_iommu_init);
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