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23#undef DEBUG
24
25#include <linux/kernel.h>
26#include <linux/init.h>
27#include <linux/interrupt.h>
28#include <linux/notifier.h>
29#include <linux/of.h>
30#include <linux/of_platform.h>
31#include <linux/slab.h>
32#include <linux/memblock.h>
33
34#include <asm/prom.h>
35#include <asm/iommu.h>
36#include <asm/machdep.h>
37#include <asm/pci-bridge.h>
38#include <asm/udbg.h>
39#include <asm/firmware.h>
40#include <asm/cell-regs.h>
41
42#include "interrupt.h"
43
44
45
46
47
48
49#define CELL_IOMMU_REAL_UNMAP
50
51
52
53
54
55
56#define CELL_IOMMU_STRICT_PROTECTION
57
58
59#define NR_IOMMUS 2
60
61
62#define IOC_Reg_Size 0x2000
63
64#define IOC_IOPT_CacheInvd 0x908
65#define IOC_IOPT_CacheInvd_NE_Mask 0xffe0000000000000ul
66#define IOC_IOPT_CacheInvd_IOPTE_Mask 0x000003fffffffff8ul
67#define IOC_IOPT_CacheInvd_Busy 0x0000000000000001ul
68
69#define IOC_IOST_Origin 0x918
70#define IOC_IOST_Origin_E 0x8000000000000000ul
71#define IOC_IOST_Origin_HW 0x0000000000000800ul
72#define IOC_IOST_Origin_HL 0x0000000000000400ul
73
74#define IOC_IO_ExcpStat 0x920
75#define IOC_IO_ExcpStat_V 0x8000000000000000ul
76#define IOC_IO_ExcpStat_SPF_Mask 0x6000000000000000ul
77#define IOC_IO_ExcpStat_SPF_S 0x6000000000000000ul
78#define IOC_IO_ExcpStat_SPF_P 0x2000000000000000ul
79#define IOC_IO_ExcpStat_ADDR_Mask 0x00000007fffff000ul
80#define IOC_IO_ExcpStat_RW_Mask 0x0000000000000800ul
81#define IOC_IO_ExcpStat_IOID_Mask 0x00000000000007fful
82
83#define IOC_IO_ExcpMask 0x928
84#define IOC_IO_ExcpMask_SFE 0x4000000000000000ul
85#define IOC_IO_ExcpMask_PFE 0x2000000000000000ul
86
87#define IOC_IOCmd_Offset 0x1000
88
89#define IOC_IOCmd_Cfg 0xc00
90#define IOC_IOCmd_Cfg_TE 0x0000800000000000ul
91
92
93
94#define IOSTE_V 0x8000000000000000ul
95#define IOSTE_H 0x4000000000000000ul
96#define IOSTE_PT_Base_RPN_Mask 0x3ffffffffffff000ul
97#define IOSTE_NPPT_Mask 0x0000000000000fe0ul
98#define IOSTE_PS_Mask 0x0000000000000007ul
99#define IOSTE_PS_4K 0x0000000000000001ul
100#define IOSTE_PS_64K 0x0000000000000003ul
101#define IOSTE_PS_1M 0x0000000000000005ul
102#define IOSTE_PS_16M 0x0000000000000007ul
103
104
105
106#define IO_SEGMENT_SHIFT 28
107#define IO_PAGENO_BITS(shift) (IO_SEGMENT_SHIFT - (shift))
108
109
110#define SPIDER_DMA_OFFSET 0x80000000ul
111
112struct iommu_window {
113 struct list_head list;
114 struct cbe_iommu *iommu;
115 unsigned long offset;
116 unsigned long size;
117 unsigned int ioid;
118 struct iommu_table table;
119};
120
121#define NAMESIZE 8
122struct cbe_iommu {
123 int nid;
124 char name[NAMESIZE];
125 void __iomem *xlate_regs;
126 void __iomem *cmd_regs;
127 unsigned long *stab;
128 unsigned long *ptab;
129 void *pad_page;
130 struct list_head windows;
131};
132
133
134
135
136
137
138static struct cbe_iommu iommus[NR_IOMMUS];
139static int cbe_nr_iommus;
140
141static void invalidate_tce_cache(struct cbe_iommu *iommu, unsigned long *pte,
142 long n_ptes)
143{
144 u64 __iomem *reg;
145 u64 val;
146 long n;
147
148 reg = iommu->xlate_regs + IOC_IOPT_CacheInvd;
149
150 while (n_ptes > 0) {
151
152 n = min(n_ptes, 1l << 11);
153 val = (((n ) << 53) & IOC_IOPT_CacheInvd_NE_Mask)
154 | (__pa(pte) & IOC_IOPT_CacheInvd_IOPTE_Mask)
155 | IOC_IOPT_CacheInvd_Busy;
156
157 out_be64(reg, val);
158 while (in_be64(reg) & IOC_IOPT_CacheInvd_Busy)
159 ;
160
161 n_ptes -= n;
162 pte += n;
163 }
164}
165
166static int tce_build_cell(struct iommu_table *tbl, long index, long npages,
167 unsigned long uaddr, enum dma_data_direction direction,
168 struct dma_attrs *attrs)
169{
170 int i;
171 unsigned long *io_pte, base_pte;
172 struct iommu_window *window =
173 container_of(tbl, struct iommu_window, table);
174
175
176
177
178#ifdef CELL_IOMMU_STRICT_PROTECTION
179
180
181
182
183
184
185 const unsigned long prot = 0xc48;
186 base_pte =
187 ((prot << (52 + 4 * direction)) &
188 (CBE_IOPTE_PP_W | CBE_IOPTE_PP_R)) |
189 CBE_IOPTE_M | CBE_IOPTE_SO_RW |
190 (window->ioid & CBE_IOPTE_IOID_Mask);
191#else
192 base_pte = CBE_IOPTE_PP_W | CBE_IOPTE_PP_R | CBE_IOPTE_M |
193 CBE_IOPTE_SO_RW | (window->ioid & CBE_IOPTE_IOID_Mask);
194#endif
195 if (unlikely(dma_get_attr(DMA_ATTR_WEAK_ORDERING, attrs)))
196 base_pte &= ~CBE_IOPTE_SO_RW;
197
198 io_pte = (unsigned long *)tbl->it_base + (index - tbl->it_offset);
199
200 for (i = 0; i < npages; i++, uaddr += IOMMU_PAGE_SIZE)
201 io_pte[i] = base_pte | (__pa(uaddr) & CBE_IOPTE_RPN_Mask);
202
203 mb();
204
205 invalidate_tce_cache(window->iommu, io_pte, npages);
206
207 pr_debug("tce_build_cell(index=%lx,n=%lx,dir=%d,base_pte=%lx)\n",
208 index, npages, direction, base_pte);
209 return 0;
210}
211
212static void tce_free_cell(struct iommu_table *tbl, long index, long npages)
213{
214
215 int i;
216 unsigned long *io_pte, pte;
217 struct iommu_window *window =
218 container_of(tbl, struct iommu_window, table);
219
220 pr_debug("tce_free_cell(index=%lx,n=%lx)\n", index, npages);
221
222#ifdef CELL_IOMMU_REAL_UNMAP
223 pte = 0;
224#else
225
226
227 pte = CBE_IOPTE_PP_R | CBE_IOPTE_M | CBE_IOPTE_SO_RW |
228 __pa(window->iommu->pad_page) |
229 (window->ioid & CBE_IOPTE_IOID_Mask);
230#endif
231
232 io_pte = (unsigned long *)tbl->it_base + (index - tbl->it_offset);
233
234 for (i = 0; i < npages; i++)
235 io_pte[i] = pte;
236
237 mb();
238
239 invalidate_tce_cache(window->iommu, io_pte, npages);
240}
241
242static irqreturn_t ioc_interrupt(int irq, void *data)
243{
244 unsigned long stat, spf;
245 struct cbe_iommu *iommu = data;
246
247 stat = in_be64(iommu->xlate_regs + IOC_IO_ExcpStat);
248 spf = stat & IOC_IO_ExcpStat_SPF_Mask;
249
250
251 printk(KERN_ERR "iommu: DMA exception 0x%016lx\n", stat);
252 printk(KERN_ERR " V=%d, SPF=[%c%c], RW=%s, IOID=0x%04x\n",
253 !!(stat & IOC_IO_ExcpStat_V),
254 (spf == IOC_IO_ExcpStat_SPF_S) ? 'S' : ' ',
255 (spf == IOC_IO_ExcpStat_SPF_P) ? 'P' : ' ',
256 (stat & IOC_IO_ExcpStat_RW_Mask) ? "Read" : "Write",
257 (unsigned int)(stat & IOC_IO_ExcpStat_IOID_Mask));
258 printk(KERN_ERR " page=0x%016lx\n",
259 stat & IOC_IO_ExcpStat_ADDR_Mask);
260
261
262 stat &= ~IOC_IO_ExcpStat_V;
263 out_be64(iommu->xlate_regs + IOC_IO_ExcpStat, stat);
264
265 return IRQ_HANDLED;
266}
267
268static int cell_iommu_find_ioc(int nid, unsigned long *base)
269{
270 struct device_node *np;
271 struct resource r;
272
273 *base = 0;
274
275
276 for_each_node_by_name(np, "ioc") {
277 if (of_node_to_nid(np) != nid)
278 continue;
279 if (of_address_to_resource(np, 0, &r)) {
280 printk(KERN_ERR "iommu: can't get address for %s\n",
281 np->full_name);
282 continue;
283 }
284 *base = r.start;
285 of_node_put(np);
286 return 0;
287 }
288
289
290 for_each_node_by_type(np, "cpu") {
291 const unsigned int *nidp;
292 const unsigned long *tmp;
293
294 nidp = of_get_property(np, "node-id", NULL);
295 if (nidp && *nidp == nid) {
296 tmp = of_get_property(np, "ioc-translation", NULL);
297 if (tmp) {
298 *base = *tmp;
299 of_node_put(np);
300 return 0;
301 }
302 }
303 }
304
305 return -ENODEV;
306}
307
308static void cell_iommu_setup_stab(struct cbe_iommu *iommu,
309 unsigned long dbase, unsigned long dsize,
310 unsigned long fbase, unsigned long fsize)
311{
312 struct page *page;
313 unsigned long segments, stab_size;
314
315 segments = max(dbase + dsize, fbase + fsize) >> IO_SEGMENT_SHIFT;
316
317 pr_debug("%s: iommu[%d]: segments: %lu\n",
318 __func__, iommu->nid, segments);
319
320
321 stab_size = segments * sizeof(unsigned long);
322 page = alloc_pages_node(iommu->nid, GFP_KERNEL, get_order(stab_size));
323 BUG_ON(!page);
324 iommu->stab = page_address(page);
325 memset(iommu->stab, 0, stab_size);
326}
327
328static unsigned long *cell_iommu_alloc_ptab(struct cbe_iommu *iommu,
329 unsigned long base, unsigned long size, unsigned long gap_base,
330 unsigned long gap_size, unsigned long page_shift)
331{
332 struct page *page;
333 int i;
334 unsigned long reg, segments, pages_per_segment, ptab_size,
335 n_pte_pages, start_seg, *ptab;
336
337 start_seg = base >> IO_SEGMENT_SHIFT;
338 segments = size >> IO_SEGMENT_SHIFT;
339 pages_per_segment = 1ull << IO_PAGENO_BITS(page_shift);
340
341 pages_per_segment = max(pages_per_segment,
342 (1 << 12) / sizeof(unsigned long));
343
344 ptab_size = segments * pages_per_segment * sizeof(unsigned long);
345 pr_debug("%s: iommu[%d]: ptab_size: %lu, order: %d\n", __func__,
346 iommu->nid, ptab_size, get_order(ptab_size));
347 page = alloc_pages_node(iommu->nid, GFP_KERNEL, get_order(ptab_size));
348 BUG_ON(!page);
349
350 ptab = page_address(page);
351 memset(ptab, 0, ptab_size);
352
353
354 n_pte_pages = (pages_per_segment * sizeof(unsigned long)) >> 12;
355
356 pr_debug("%s: iommu[%d]: stab at %p, ptab at %p, n_pte_pages: %lu\n",
357 __func__, iommu->nid, iommu->stab, ptab,
358 n_pte_pages);
359
360
361 reg = IOSTE_V | ((n_pte_pages - 1) << 5);
362
363 switch (page_shift) {
364 case 12: reg |= IOSTE_PS_4K; break;
365 case 16: reg |= IOSTE_PS_64K; break;
366 case 20: reg |= IOSTE_PS_1M; break;
367 case 24: reg |= IOSTE_PS_16M; break;
368 default: BUG();
369 }
370
371 gap_base = gap_base >> IO_SEGMENT_SHIFT;
372 gap_size = gap_size >> IO_SEGMENT_SHIFT;
373
374 pr_debug("Setting up IOMMU stab:\n");
375 for (i = start_seg; i < (start_seg + segments); i++) {
376 if (i >= gap_base && i < (gap_base + gap_size)) {
377 pr_debug("\toverlap at %d, skipping\n", i);
378 continue;
379 }
380 iommu->stab[i] = reg | (__pa(ptab) + (n_pte_pages << 12) *
381 (i - start_seg));
382 pr_debug("\t[%d] 0x%016lx\n", i, iommu->stab[i]);
383 }
384
385 return ptab;
386}
387
388static void cell_iommu_enable_hardware(struct cbe_iommu *iommu)
389{
390 int ret;
391 unsigned long reg, xlate_base;
392 unsigned int virq;
393
394 if (cell_iommu_find_ioc(iommu->nid, &xlate_base))
395 panic("%s: missing IOC register mappings for node %d\n",
396 __func__, iommu->nid);
397
398 iommu->xlate_regs = ioremap(xlate_base, IOC_Reg_Size);
399 iommu->cmd_regs = iommu->xlate_regs + IOC_IOCmd_Offset;
400
401
402 mb();
403
404
405 reg = in_be64(iommu->xlate_regs + IOC_IO_ExcpStat);
406 out_be64(iommu->xlate_regs + IOC_IO_ExcpStat,
407 reg & ~IOC_IO_ExcpStat_V);
408 out_be64(iommu->xlate_regs + IOC_IO_ExcpMask,
409 IOC_IO_ExcpMask_PFE | IOC_IO_ExcpMask_SFE);
410
411 virq = irq_create_mapping(NULL,
412 IIC_IRQ_IOEX_ATI | (iommu->nid << IIC_IRQ_NODE_SHIFT));
413 BUG_ON(virq == NO_IRQ);
414
415 ret = request_irq(virq, ioc_interrupt, IRQF_DISABLED,
416 iommu->name, iommu);
417 BUG_ON(ret);
418
419
420 reg = IOC_IOST_Origin_E | __pa(iommu->stab) | IOC_IOST_Origin_HW;
421 out_be64(iommu->xlate_regs + IOC_IOST_Origin, reg);
422 in_be64(iommu->xlate_regs + IOC_IOST_Origin);
423
424
425 reg = in_be64(iommu->cmd_regs + IOC_IOCmd_Cfg) | IOC_IOCmd_Cfg_TE;
426 out_be64(iommu->cmd_regs + IOC_IOCmd_Cfg, reg);
427}
428
429static void cell_iommu_setup_hardware(struct cbe_iommu *iommu,
430 unsigned long base, unsigned long size)
431{
432 cell_iommu_setup_stab(iommu, base, size, 0, 0);
433 iommu->ptab = cell_iommu_alloc_ptab(iommu, base, size, 0, 0,
434 IOMMU_PAGE_SHIFT);
435 cell_iommu_enable_hardware(iommu);
436}
437
438#if 0
439static struct iommu_window *find_window(struct cbe_iommu *iommu,
440 unsigned long offset, unsigned long size)
441{
442 struct iommu_window *window;
443
444
445
446 list_for_each_entry(window, &(iommu->windows), list) {
447 if (window->offset == offset && window->size == size)
448 return window;
449 }
450
451 return NULL;
452}
453#endif
454
455static inline u32 cell_iommu_get_ioid(struct device_node *np)
456{
457 const u32 *ioid;
458
459 ioid = of_get_property(np, "ioid", NULL);
460 if (ioid == NULL) {
461 printk(KERN_WARNING "iommu: missing ioid for %s using 0\n",
462 np->full_name);
463 return 0;
464 }
465
466 return *ioid;
467}
468
469static struct iommu_window * __init
470cell_iommu_setup_window(struct cbe_iommu *iommu, struct device_node *np,
471 unsigned long offset, unsigned long size,
472 unsigned long pte_offset)
473{
474 struct iommu_window *window;
475 struct page *page;
476 u32 ioid;
477
478 ioid = cell_iommu_get_ioid(np);
479
480 window = kzalloc_node(sizeof(*window), GFP_KERNEL, iommu->nid);
481 BUG_ON(window == NULL);
482
483 window->offset = offset;
484 window->size = size;
485 window->ioid = ioid;
486 window->iommu = iommu;
487
488 window->table.it_blocksize = 16;
489 window->table.it_base = (unsigned long)iommu->ptab;
490 window->table.it_index = iommu->nid;
491 window->table.it_offset = (offset >> IOMMU_PAGE_SHIFT) + pte_offset;
492 window->table.it_size = size >> IOMMU_PAGE_SHIFT;
493
494 iommu_init_table(&window->table, iommu->nid);
495
496 pr_debug("\tioid %d\n", window->ioid);
497 pr_debug("\tblocksize %ld\n", window->table.it_blocksize);
498 pr_debug("\tbase 0x%016lx\n", window->table.it_base);
499 pr_debug("\toffset 0x%lx\n", window->table.it_offset);
500 pr_debug("\tsize %ld\n", window->table.it_size);
501
502 list_add(&window->list, &iommu->windows);
503
504 if (offset != 0)
505 return window;
506
507
508
509
510
511
512
513
514 page = alloc_pages_node(iommu->nid, GFP_KERNEL, 0);
515 BUG_ON(!page);
516 iommu->pad_page = page_address(page);
517 clear_page(iommu->pad_page);
518
519 __set_bit(0, window->table.it_map);
520 tce_build_cell(&window->table, window->table.it_offset, 1,
521 (unsigned long)iommu->pad_page, DMA_TO_DEVICE, NULL);
522 window->table.it_hint = window->table.it_blocksize;
523
524 return window;
525}
526
527static struct cbe_iommu *cell_iommu_for_node(int nid)
528{
529 int i;
530
531 for (i = 0; i < cbe_nr_iommus; i++)
532 if (iommus[i].nid == nid)
533 return &iommus[i];
534 return NULL;
535}
536
537static unsigned long cell_dma_direct_offset;
538
539static unsigned long dma_iommu_fixed_base;
540
541
542static int iommu_fixed_is_weak;
543
544static struct iommu_table *cell_get_iommu_table(struct device *dev)
545{
546 struct iommu_window *window;
547 struct cbe_iommu *iommu;
548
549
550
551
552
553 iommu = cell_iommu_for_node(dev_to_node(dev));
554 if (iommu == NULL || list_empty(&iommu->windows)) {
555 printk(KERN_ERR "iommu: missing iommu for %s (node %d)\n",
556 dev->of_node ? dev->of_node->full_name : "?",
557 dev_to_node(dev));
558 return NULL;
559 }
560 window = list_entry(iommu->windows.next, struct iommu_window, list);
561
562 return &window->table;
563}
564
565
566
567static void *dma_fixed_alloc_coherent(struct device *dev, size_t size,
568 dma_addr_t *dma_handle, gfp_t flag)
569{
570 if (iommu_fixed_is_weak)
571 return iommu_alloc_coherent(dev, cell_get_iommu_table(dev),
572 size, dma_handle,
573 device_to_mask(dev), flag,
574 dev_to_node(dev));
575 else
576 return dma_direct_ops.alloc_coherent(dev, size, dma_handle,
577 flag);
578}
579
580static void dma_fixed_free_coherent(struct device *dev, size_t size,
581 void *vaddr, dma_addr_t dma_handle)
582{
583 if (iommu_fixed_is_weak)
584 iommu_free_coherent(cell_get_iommu_table(dev), size, vaddr,
585 dma_handle);
586 else
587 dma_direct_ops.free_coherent(dev, size, vaddr, dma_handle);
588}
589
590static dma_addr_t dma_fixed_map_page(struct device *dev, struct page *page,
591 unsigned long offset, size_t size,
592 enum dma_data_direction direction,
593 struct dma_attrs *attrs)
594{
595 if (iommu_fixed_is_weak == dma_get_attr(DMA_ATTR_WEAK_ORDERING, attrs))
596 return dma_direct_ops.map_page(dev, page, offset, size,
597 direction, attrs);
598 else
599 return iommu_map_page(dev, cell_get_iommu_table(dev), page,
600 offset, size, device_to_mask(dev),
601 direction, attrs);
602}
603
604static void dma_fixed_unmap_page(struct device *dev, dma_addr_t dma_addr,
605 size_t size, enum dma_data_direction direction,
606 struct dma_attrs *attrs)
607{
608 if (iommu_fixed_is_weak == dma_get_attr(DMA_ATTR_WEAK_ORDERING, attrs))
609 dma_direct_ops.unmap_page(dev, dma_addr, size, direction,
610 attrs);
611 else
612 iommu_unmap_page(cell_get_iommu_table(dev), dma_addr, size,
613 direction, attrs);
614}
615
616static int dma_fixed_map_sg(struct device *dev, struct scatterlist *sg,
617 int nents, enum dma_data_direction direction,
618 struct dma_attrs *attrs)
619{
620 if (iommu_fixed_is_weak == dma_get_attr(DMA_ATTR_WEAK_ORDERING, attrs))
621 return dma_direct_ops.map_sg(dev, sg, nents, direction, attrs);
622 else
623 return iommu_map_sg(dev, cell_get_iommu_table(dev), sg, nents,
624 device_to_mask(dev), direction, attrs);
625}
626
627static void dma_fixed_unmap_sg(struct device *dev, struct scatterlist *sg,
628 int nents, enum dma_data_direction direction,
629 struct dma_attrs *attrs)
630{
631 if (iommu_fixed_is_weak == dma_get_attr(DMA_ATTR_WEAK_ORDERING, attrs))
632 dma_direct_ops.unmap_sg(dev, sg, nents, direction, attrs);
633 else
634 iommu_unmap_sg(cell_get_iommu_table(dev), sg, nents, direction,
635 attrs);
636}
637
638static int dma_fixed_dma_supported(struct device *dev, u64 mask)
639{
640 return mask == DMA_BIT_MASK(64);
641}
642
643static int dma_set_mask_and_switch(struct device *dev, u64 dma_mask);
644
645struct dma_map_ops dma_iommu_fixed_ops = {
646 .alloc_coherent = dma_fixed_alloc_coherent,
647 .free_coherent = dma_fixed_free_coherent,
648 .map_sg = dma_fixed_map_sg,
649 .unmap_sg = dma_fixed_unmap_sg,
650 .dma_supported = dma_fixed_dma_supported,
651 .set_dma_mask = dma_set_mask_and_switch,
652 .map_page = dma_fixed_map_page,
653 .unmap_page = dma_fixed_unmap_page,
654};
655
656static void cell_dma_dev_setup_fixed(struct device *dev);
657
658static void cell_dma_dev_setup(struct device *dev)
659{
660
661 if (get_dma_ops(dev) == &dma_iommu_fixed_ops)
662 cell_dma_dev_setup_fixed(dev);
663 else if (get_pci_dma_ops() == &dma_iommu_ops)
664 set_iommu_table_base(dev, cell_get_iommu_table(dev));
665 else if (get_pci_dma_ops() == &dma_direct_ops)
666 set_dma_offset(dev, cell_dma_direct_offset);
667 else
668 BUG();
669}
670
671static void cell_pci_dma_dev_setup(struct pci_dev *dev)
672{
673 cell_dma_dev_setup(&dev->dev);
674}
675
676static int cell_of_bus_notify(struct notifier_block *nb, unsigned long action,
677 void *data)
678{
679 struct device *dev = data;
680
681
682 if (action != BUS_NOTIFY_ADD_DEVICE)
683 return 0;
684
685
686 dev->archdata.dma_ops = get_pci_dma_ops();
687
688 cell_dma_dev_setup(dev);
689
690 return 0;
691}
692
693static struct notifier_block cell_of_bus_notifier = {
694 .notifier_call = cell_of_bus_notify
695};
696
697static int __init cell_iommu_get_window(struct device_node *np,
698 unsigned long *base,
699 unsigned long *size)
700{
701 const void *dma_window;
702 unsigned long index;
703
704
705 dma_window = of_get_property(np, "ibm,dma-window", NULL);
706 if (dma_window == NULL) {
707 *base = 0;
708 *size = 0x80000000u;
709 return -ENODEV;
710 }
711
712 of_parse_dma_window(np, dma_window, &index, base, size);
713 return 0;
714}
715
716static struct cbe_iommu * __init cell_iommu_alloc(struct device_node *np)
717{
718 struct cbe_iommu *iommu;
719 int nid, i;
720
721
722 nid = of_node_to_nid(np);
723 if (nid < 0) {
724 printk(KERN_ERR "iommu: failed to get node for %s\n",
725 np->full_name);
726 return NULL;
727 }
728 pr_debug("iommu: setting up iommu for node %d (%s)\n",
729 nid, np->full_name);
730
731
732
733
734
735
736
737
738
739 if (cbe_nr_iommus >= NR_IOMMUS) {
740 printk(KERN_ERR "iommu: too many IOMMUs detected ! (%s)\n",
741 np->full_name);
742 return NULL;
743 }
744
745
746 i = cbe_nr_iommus++;
747 iommu = &iommus[i];
748 iommu->stab = NULL;
749 iommu->nid = nid;
750 snprintf(iommu->name, sizeof(iommu->name), "iommu%d", i);
751 INIT_LIST_HEAD(&iommu->windows);
752
753 return iommu;
754}
755
756static void __init cell_iommu_init_one(struct device_node *np,
757 unsigned long offset)
758{
759 struct cbe_iommu *iommu;
760 unsigned long base, size;
761
762 iommu = cell_iommu_alloc(np);
763 if (!iommu)
764 return;
765
766
767 cell_iommu_get_window(np, &base, &size);
768
769 pr_debug("\ttranslating window 0x%lx...0x%lx\n",
770 base, base + size - 1);
771
772
773 cell_iommu_setup_hardware(iommu, base, size);
774
775
776 cell_iommu_setup_window(iommu, np, base, size,
777 offset >> IOMMU_PAGE_SHIFT);
778}
779
780static void __init cell_disable_iommus(void)
781{
782 int node;
783 unsigned long base, val;
784 void __iomem *xregs, *cregs;
785
786
787 for_each_online_node(node) {
788 if (cell_iommu_find_ioc(node, &base))
789 continue;
790 xregs = ioremap(base, IOC_Reg_Size);
791 if (xregs == NULL)
792 continue;
793 cregs = xregs + IOC_IOCmd_Offset;
794
795 pr_debug("iommu: cleaning up iommu on node %d\n", node);
796
797 out_be64(xregs + IOC_IOST_Origin, 0);
798 (void)in_be64(xregs + IOC_IOST_Origin);
799 val = in_be64(cregs + IOC_IOCmd_Cfg);
800 val &= ~IOC_IOCmd_Cfg_TE;
801 out_be64(cregs + IOC_IOCmd_Cfg, val);
802 (void)in_be64(cregs + IOC_IOCmd_Cfg);
803
804 iounmap(xregs);
805 }
806}
807
808static int __init cell_iommu_init_disabled(void)
809{
810 struct device_node *np = NULL;
811 unsigned long base = 0, size;
812
813
814 set_pci_dma_ops(&dma_direct_ops);
815
816
817 cell_disable_iommus();
818
819
820 if (of_find_node_by_name(NULL, "axon") == NULL)
821 cell_dma_direct_offset = SPIDER_DMA_OFFSET;
822
823
824
825
826
827
828
829 for_each_node_by_name(np, "axon") {
830 if (np->parent == NULL || np->parent->parent != NULL)
831 continue;
832 if (cell_iommu_get_window(np, &base, &size) == 0)
833 break;
834 }
835 if (np == NULL) {
836 for_each_node_by_name(np, "pci-internal") {
837 if (np->parent == NULL || np->parent->parent != NULL)
838 continue;
839 if (cell_iommu_get_window(np, &base, &size) == 0)
840 break;
841 }
842 }
843 of_node_put(np);
844
845
846
847
848 if (np && size < memblock_end_of_DRAM()) {
849 printk(KERN_WARNING "iommu: force-enabled, dma window"
850 " (%ldMB) smaller than total memory (%lldMB)\n",
851 size >> 20, memblock_end_of_DRAM() >> 20);
852 return -ENODEV;
853 }
854
855 cell_dma_direct_offset += base;
856
857 if (cell_dma_direct_offset != 0)
858 ppc_md.pci_dma_dev_setup = cell_pci_dma_dev_setup;
859
860 printk("iommu: disabled, direct DMA offset is 0x%lx\n",
861 cell_dma_direct_offset);
862
863 return 0;
864}
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892static u64 cell_iommu_get_fixed_address(struct device *dev)
893{
894 u64 cpu_addr, size, best_size, dev_addr = OF_BAD_ADDR;
895 struct device_node *np;
896 const u32 *ranges = NULL;
897 int i, len, best, naddr, nsize, pna, range_size;
898
899 np = of_node_get(dev->of_node);
900 while (1) {
901 naddr = of_n_addr_cells(np);
902 nsize = of_n_size_cells(np);
903 np = of_get_next_parent(np);
904 if (!np)
905 break;
906
907 ranges = of_get_property(np, "dma-ranges", &len);
908
909
910 if (ranges && len > 0)
911 break;
912 }
913
914 if (!ranges) {
915 dev_dbg(dev, "iommu: no dma-ranges found\n");
916 goto out;
917 }
918
919 len /= sizeof(u32);
920
921 pna = of_n_addr_cells(np);
922 range_size = naddr + nsize + pna;
923
924
925
926
927
928
929 for (i = 0, best = -1, best_size = 0; i < len; i += range_size) {
930 cpu_addr = of_translate_dma_address(np, ranges + i + naddr);
931 size = of_read_number(ranges + i + naddr + pna, nsize);
932
933 if (cpu_addr == 0 && size > best_size) {
934 best = i;
935 best_size = size;
936 }
937 }
938
939 if (best >= 0) {
940 dev_addr = of_read_number(ranges + best, naddr);
941 } else
942 dev_dbg(dev, "iommu: no suitable range found!\n");
943
944out:
945 of_node_put(np);
946
947 return dev_addr;
948}
949
950static int dma_set_mask_and_switch(struct device *dev, u64 dma_mask)
951{
952 if (!dev->dma_mask || !dma_supported(dev, dma_mask))
953 return -EIO;
954
955 if (dma_mask == DMA_BIT_MASK(64) &&
956 cell_iommu_get_fixed_address(dev) != OF_BAD_ADDR)
957 {
958 dev_dbg(dev, "iommu: 64-bit OK, using fixed ops\n");
959 set_dma_ops(dev, &dma_iommu_fixed_ops);
960 } else {
961 dev_dbg(dev, "iommu: not 64-bit, using default ops\n");
962 set_dma_ops(dev, get_pci_dma_ops());
963 }
964
965 cell_dma_dev_setup(dev);
966
967 *dev->dma_mask = dma_mask;
968
969 return 0;
970}
971
972static void cell_dma_dev_setup_fixed(struct device *dev)
973{
974 u64 addr;
975
976 addr = cell_iommu_get_fixed_address(dev) + dma_iommu_fixed_base;
977 set_dma_offset(dev, addr);
978
979 dev_dbg(dev, "iommu: fixed addr = %llx\n", addr);
980}
981
982static void insert_16M_pte(unsigned long addr, unsigned long *ptab,
983 unsigned long base_pte)
984{
985 unsigned long segment, offset;
986
987 segment = addr >> IO_SEGMENT_SHIFT;
988 offset = (addr >> 24) - (segment << IO_PAGENO_BITS(24));
989 ptab = ptab + (segment * (1 << 12) / sizeof(unsigned long));
990
991 pr_debug("iommu: addr %lx ptab %p segment %lx offset %lx\n",
992 addr, ptab, segment, offset);
993
994 ptab[offset] = base_pte | (__pa(addr) & CBE_IOPTE_RPN_Mask);
995}
996
997static void cell_iommu_setup_fixed_ptab(struct cbe_iommu *iommu,
998 struct device_node *np, unsigned long dbase, unsigned long dsize,
999 unsigned long fbase, unsigned long fsize)
1000{
1001 unsigned long base_pte, uaddr, ioaddr, *ptab;
1002
1003 ptab = cell_iommu_alloc_ptab(iommu, fbase, fsize, dbase, dsize, 24);
1004
1005 dma_iommu_fixed_base = fbase;
1006
1007 pr_debug("iommu: mapping 0x%lx pages from 0x%lx\n", fsize, fbase);
1008
1009 base_pte = CBE_IOPTE_PP_W | CBE_IOPTE_PP_R | CBE_IOPTE_M |
1010 (cell_iommu_get_ioid(np) & CBE_IOPTE_IOID_Mask);
1011
1012 if (iommu_fixed_is_weak)
1013 pr_info("IOMMU: Using weak ordering for fixed mapping\n");
1014 else {
1015 pr_info("IOMMU: Using strong ordering for fixed mapping\n");
1016 base_pte |= CBE_IOPTE_SO_RW;
1017 }
1018
1019 for (uaddr = 0; uaddr < fsize; uaddr += (1 << 24)) {
1020
1021 ioaddr = uaddr + fbase;
1022 if (ioaddr >= dbase && ioaddr < (dbase + dsize)) {
1023 pr_debug("iommu: fixed/dynamic overlap, skipping\n");
1024 continue;
1025 }
1026
1027 insert_16M_pte(uaddr, ptab, base_pte);
1028 }
1029
1030 mb();
1031}
1032
1033static int __init cell_iommu_fixed_mapping_init(void)
1034{
1035 unsigned long dbase, dsize, fbase, fsize, hbase, hend;
1036 struct cbe_iommu *iommu;
1037 struct device_node *np;
1038
1039
1040 np = of_find_node_by_name(NULL, "axon");
1041 if (!np) {
1042 pr_debug("iommu: fixed mapping disabled, no axons found\n");
1043 return -1;
1044 }
1045
1046
1047 np = of_find_node_with_property(NULL, "dma-ranges");
1048 of_node_put(np);
1049
1050 if (!np) {
1051 pr_debug("iommu: no dma-ranges found, no fixed mapping\n");
1052 return -1;
1053 }
1054
1055
1056
1057
1058
1059
1060 fbase = 0;
1061 for_each_node_by_name(np, "axon") {
1062 cell_iommu_get_window(np, &dbase, &dsize);
1063 fbase = max(fbase, dbase + dsize);
1064 }
1065
1066 fbase = _ALIGN_UP(fbase, 1 << IO_SEGMENT_SHIFT);
1067 fsize = memblock_phys_mem_size();
1068
1069 if ((fbase + fsize) <= 0x800000000ul)
1070 hbase = 0;
1071 else {
1072
1073
1074
1075
1076
1077
1078 if (!htab_address) {
1079 pr_debug("iommu: htab is NULL, on LPAR? Huh?\n");
1080 return -1;
1081 }
1082 hbase = __pa(htab_address);
1083 hend = hbase + htab_size_bytes;
1084
1085
1086 if ((hbase != _ALIGN_UP(hbase, 1 << IO_SEGMENT_SHIFT)) ||
1087 (hend != _ALIGN_UP(hend, 1 << IO_SEGMENT_SHIFT))) {
1088 pr_debug("iommu: hash window not segment aligned\n");
1089 return -1;
1090 }
1091
1092
1093 for_each_node_by_name(np, "axon") {
1094 cell_iommu_get_window(np, &dbase, &dsize);
1095
1096 if (hbase < dbase || (hend > (dbase + dsize))) {
1097 pr_debug("iommu: hash window doesn't fit in"
1098 "real DMA window\n");
1099 return -1;
1100 }
1101 }
1102
1103 fbase = 0;
1104 }
1105
1106
1107 for_each_node_by_name(np, "axon") {
1108 iommu = cell_iommu_alloc(np);
1109 BUG_ON(!iommu);
1110
1111 if (hbase == 0)
1112 cell_iommu_get_window(np, &dbase, &dsize);
1113 else {
1114 dbase = hbase;
1115 dsize = htab_size_bytes;
1116 }
1117
1118 printk(KERN_DEBUG "iommu: node %d, dynamic window 0x%lx-0x%lx "
1119 "fixed window 0x%lx-0x%lx\n", iommu->nid, dbase,
1120 dbase + dsize, fbase, fbase + fsize);
1121
1122 cell_iommu_setup_stab(iommu, dbase, dsize, fbase, fsize);
1123 iommu->ptab = cell_iommu_alloc_ptab(iommu, dbase, dsize, 0, 0,
1124 IOMMU_PAGE_SHIFT);
1125 cell_iommu_setup_fixed_ptab(iommu, np, dbase, dsize,
1126 fbase, fsize);
1127 cell_iommu_enable_hardware(iommu);
1128 cell_iommu_setup_window(iommu, np, dbase, dsize, 0);
1129 }
1130
1131 dma_iommu_ops.set_dma_mask = dma_set_mask_and_switch;
1132 set_pci_dma_ops(&dma_iommu_ops);
1133
1134 return 0;
1135}
1136
1137static int iommu_fixed_disabled;
1138
1139static int __init setup_iommu_fixed(char *str)
1140{
1141 struct device_node *pciep;
1142
1143 if (strcmp(str, "off") == 0)
1144 iommu_fixed_disabled = 1;
1145
1146
1147
1148
1149
1150
1151 pciep = of_find_node_by_type(NULL, "pcie-endpoint");
1152
1153 if (strcmp(str, "weak") == 0 || (pciep && strcmp(str, "strong") != 0))
1154 iommu_fixed_is_weak = 1;
1155
1156 of_node_put(pciep);
1157
1158 return 1;
1159}
1160__setup("iommu_fixed=", setup_iommu_fixed);
1161
1162static int __init cell_iommu_init(void)
1163{
1164 struct device_node *np;
1165
1166
1167
1168
1169
1170
1171 if (iommu_is_off ||
1172 (!iommu_force_on && memblock_end_of_DRAM() <= 0x80000000ull))
1173 if (cell_iommu_init_disabled() == 0)
1174 goto bail;
1175
1176
1177 ppc_md.pci_dma_dev_setup = cell_pci_dma_dev_setup;
1178 ppc_md.tce_build = tce_build_cell;
1179 ppc_md.tce_free = tce_free_cell;
1180
1181 if (!iommu_fixed_disabled && cell_iommu_fixed_mapping_init() == 0)
1182 goto bail;
1183
1184
1185 for_each_node_by_name(np, "axon") {
1186 if (np->parent == NULL || np->parent->parent != NULL)
1187 continue;
1188 cell_iommu_init_one(np, 0);
1189 }
1190
1191
1192
1193
1194 for_each_node_by_name(np, "pci-internal") {
1195 if (np->parent == NULL || np->parent->parent != NULL)
1196 continue;
1197 cell_iommu_init_one(np, SPIDER_DMA_OFFSET);
1198 }
1199
1200
1201 set_pci_dma_ops(&dma_iommu_ops);
1202
1203 bail:
1204
1205
1206
1207 bus_register_notifier(&platform_bus_type, &cell_of_bus_notifier);
1208
1209 return 0;
1210}
1211machine_arch_initcall(cell, cell_iommu_init);
1212machine_arch_initcall(celleb_native, cell_iommu_init);
1213
1214