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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Derived from arch/powerpc/kernel/iommu.c
4 *
5 * Copyright IBM Corporation, 2006-2007
6 * Copyright (C) 2006 Jon Mason <jdmason@kudzu.us>
7 *
8 * Author: Jon Mason <jdmason@kudzu.us>
9 * Author: Muli Ben-Yehuda <muli@il.ibm.com>
10
11 */
12
13#define pr_fmt(fmt) "Calgary: " fmt
14
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/types.h>
18#include <linux/slab.h>
19#include <linux/mm.h>
20#include <linux/spinlock.h>
21#include <linux/string.h>
22#include <linux/crash_dump.h>
23#include <linux/dma-mapping.h>
24#include <linux/dma-direct.h>
25#include <linux/bitmap.h>
26#include <linux/pci_ids.h>
27#include <linux/pci.h>
28#include <linux/delay.h>
29#include <linux/scatterlist.h>
30#include <linux/iommu-helper.h>
31
32#include <asm/iommu.h>
33#include <asm/calgary.h>
34#include <asm/tce.h>
35#include <asm/pci-direct.h>
36#include <asm/dma.h>
37#include <asm/rio.h>
38#include <asm/bios_ebda.h>
39#include <asm/x86_init.h>
40#include <asm/iommu_table.h>
41
42#ifdef CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT
43int use_calgary __read_mostly = 1;
44#else
45int use_calgary __read_mostly = 0;
46#endif /* CONFIG_CALGARY_DEFAULT_ENABLED */
47
48#define PCI_DEVICE_ID_IBM_CALGARY 0x02a1
49#define PCI_DEVICE_ID_IBM_CALIOC2 0x0308
50
51/* register offsets inside the host bridge space */
52#define CALGARY_CONFIG_REG 0x0108
53#define PHB_CSR_OFFSET 0x0110 /* Channel Status */
54#define PHB_PLSSR_OFFSET 0x0120
55#define PHB_CONFIG_RW_OFFSET 0x0160
56#define PHB_IOBASE_BAR_LOW 0x0170
57#define PHB_IOBASE_BAR_HIGH 0x0180
58#define PHB_MEM_1_LOW 0x0190
59#define PHB_MEM_1_HIGH 0x01A0
60#define PHB_IO_ADDR_SIZE 0x01B0
61#define PHB_MEM_1_SIZE 0x01C0
62#define PHB_MEM_ST_OFFSET 0x01D0
63#define PHB_AER_OFFSET 0x0200
64#define PHB_CONFIG_0_HIGH 0x0220
65#define PHB_CONFIG_0_LOW 0x0230
66#define PHB_CONFIG_0_END 0x0240
67#define PHB_MEM_2_LOW 0x02B0
68#define PHB_MEM_2_HIGH 0x02C0
69#define PHB_MEM_2_SIZE_HIGH 0x02D0
70#define PHB_MEM_2_SIZE_LOW 0x02E0
71#define PHB_DOSHOLE_OFFSET 0x08E0
72
73/* CalIOC2 specific */
74#define PHB_SAVIOR_L2 0x0DB0
75#define PHB_PAGE_MIG_CTRL 0x0DA8
76#define PHB_PAGE_MIG_DEBUG 0x0DA0
77#define PHB_ROOT_COMPLEX_STATUS 0x0CB0
78
79/* PHB_CONFIG_RW */
80#define PHB_TCE_ENABLE 0x20000000
81#define PHB_SLOT_DISABLE 0x1C000000
82#define PHB_DAC_DISABLE 0x01000000
83#define PHB_MEM2_ENABLE 0x00400000
84#define PHB_MCSR_ENABLE 0x00100000
85/* TAR (Table Address Register) */
86#define TAR_SW_BITS 0x0000ffffffff800fUL
87#define TAR_VALID 0x0000000000000008UL
88/* CSR (Channel/DMA Status Register) */
89#define CSR_AGENT_MASK 0xffe0ffff
90/* CCR (Calgary Configuration Register) */
91#define CCR_2SEC_TIMEOUT 0x000000000000000EUL
92/* PMCR/PMDR (Page Migration Control/Debug Registers */
93#define PMR_SOFTSTOP 0x80000000
94#define PMR_SOFTSTOPFAULT 0x40000000
95#define PMR_HARDSTOP 0x20000000
96
97/*
98 * The maximum PHB bus number.
99 * x3950M2 (rare): 8 chassis, 48 PHBs per chassis = 384
100 * x3950M2: 4 chassis, 48 PHBs per chassis = 192
101 * x3950 (PCIE): 8 chassis, 32 PHBs per chassis = 256
102 * x3950 (PCIX): 8 chassis, 16 PHBs per chassis = 128
103 */
104#define MAX_PHB_BUS_NUM 256
105
106#define PHBS_PER_CALGARY 4
107
108/* register offsets in Calgary's internal register space */
109static const unsigned long tar_offsets[] = {
110 0x0580 /* TAR0 */,
111 0x0588 /* TAR1 */,
112 0x0590 /* TAR2 */,
113 0x0598 /* TAR3 */
114};
115
116static const unsigned long split_queue_offsets[] = {
117 0x4870 /* SPLIT QUEUE 0 */,
118 0x5870 /* SPLIT QUEUE 1 */,
119 0x6870 /* SPLIT QUEUE 2 */,
120 0x7870 /* SPLIT QUEUE 3 */
121};
122
123static const unsigned long phb_offsets[] = {
124 0x8000 /* PHB0 */,
125 0x9000 /* PHB1 */,
126 0xA000 /* PHB2 */,
127 0xB000 /* PHB3 */
128};
129
130/* PHB debug registers */
131
132static const unsigned long phb_debug_offsets[] = {
133 0x4000 /* PHB 0 DEBUG */,
134 0x5000 /* PHB 1 DEBUG */,
135 0x6000 /* PHB 2 DEBUG */,
136 0x7000 /* PHB 3 DEBUG */
137};
138
139/*
140 * STUFF register for each debug PHB,
141 * byte 1 = start bus number, byte 2 = end bus number
142 */
143
144#define PHB_DEBUG_STUFF_OFFSET 0x0020
145
146unsigned int specified_table_size = TCE_TABLE_SIZE_UNSPECIFIED;
147static int translate_empty_slots __read_mostly = 0;
148static int calgary_detected __read_mostly = 0;
149
150static struct rio_table_hdr *rio_table_hdr __initdata;
151static struct scal_detail *scal_devs[MAX_NUMNODES] __initdata;
152static struct rio_detail *rio_devs[MAX_NUMNODES * 4] __initdata;
153
154struct calgary_bus_info {
155 void *tce_space;
156 unsigned char translation_disabled;
157 signed char phbid;
158 void __iomem *bbar;
159};
160
161static void calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
162static void calgary_tce_cache_blast(struct iommu_table *tbl);
163static void calgary_dump_error_regs(struct iommu_table *tbl);
164static void calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
165static void calioc2_tce_cache_blast(struct iommu_table *tbl);
166static void calioc2_dump_error_regs(struct iommu_table *tbl);
167static void calgary_init_bitmap_from_tce_table(struct iommu_table *tbl);
168static void get_tce_space_from_tar(void);
169
170static const struct cal_chipset_ops calgary_chip_ops = {
171 .handle_quirks = calgary_handle_quirks,
172 .tce_cache_blast = calgary_tce_cache_blast,
173 .dump_error_regs = calgary_dump_error_regs
174};
175
176static const struct cal_chipset_ops calioc2_chip_ops = {
177 .handle_quirks = calioc2_handle_quirks,
178 .tce_cache_blast = calioc2_tce_cache_blast,
179 .dump_error_regs = calioc2_dump_error_regs
180};
181
182static struct calgary_bus_info bus_info[MAX_PHB_BUS_NUM] = { { NULL, 0, 0 }, };
183
184static inline int translation_enabled(struct iommu_table *tbl)
185{
186 /* only PHBs with translation enabled have an IOMMU table */
187 return (tbl != NULL);
188}
189
190static void iommu_range_reserve(struct iommu_table *tbl,
191 unsigned long start_addr, unsigned int npages)
192{
193 unsigned long index;
194 unsigned long end;
195 unsigned long flags;
196
197 index = start_addr >> PAGE_SHIFT;
198
199 /* bail out if we're asked to reserve a region we don't cover */
200 if (index >= tbl->it_size)
201 return;
202
203 end = index + npages;
204 if (end > tbl->it_size) /* don't go off the table */
205 end = tbl->it_size;
206
207 spin_lock_irqsave(&tbl->it_lock, flags);
208
209 bitmap_set(tbl->it_map, index, npages);
210
211 spin_unlock_irqrestore(&tbl->it_lock, flags);
212}
213
214static unsigned long iommu_range_alloc(struct device *dev,
215 struct iommu_table *tbl,
216 unsigned int npages)
217{
218 unsigned long flags;
219 unsigned long offset;
220 unsigned long boundary_size;
221
222 boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
223 PAGE_SIZE) >> PAGE_SHIFT;
224
225 BUG_ON(npages == 0);
226
227 spin_lock_irqsave(&tbl->it_lock, flags);
228
229 offset = iommu_area_alloc(tbl->it_map, tbl->it_size, tbl->it_hint,
230 npages, 0, boundary_size, 0);
231 if (offset == ~0UL) {
232 tbl->chip_ops->tce_cache_blast(tbl);
233
234 offset = iommu_area_alloc(tbl->it_map, tbl->it_size, 0,
235 npages, 0, boundary_size, 0);
236 if (offset == ~0UL) {
237 pr_warn("IOMMU full\n");
238 spin_unlock_irqrestore(&tbl->it_lock, flags);
239 if (panic_on_overflow)
240 panic("Calgary: fix the allocator.\n");
241 else
242 return DMA_MAPPING_ERROR;
243 }
244 }
245
246 tbl->it_hint = offset + npages;
247 BUG_ON(tbl->it_hint > tbl->it_size);
248
249 spin_unlock_irqrestore(&tbl->it_lock, flags);
250
251 return offset;
252}
253
254static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
255 void *vaddr, unsigned int npages, int direction)
256{
257 unsigned long entry;
258 dma_addr_t ret;
259
260 entry = iommu_range_alloc(dev, tbl, npages);
261 if (unlikely(entry == DMA_MAPPING_ERROR)) {
262 pr_warn("failed to allocate %u pages in iommu %p\n",
263 npages, tbl);
264 return DMA_MAPPING_ERROR;
265 }
266
267 /* set the return dma address */
268 ret = (entry << PAGE_SHIFT) | ((unsigned long)vaddr & ~PAGE_MASK);
269
270 /* put the TCEs in the HW table */
271 tce_build(tbl, entry, npages, (unsigned long)vaddr & PAGE_MASK,
272 direction);
273 return ret;
274}
275
276static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
277 unsigned int npages)
278{
279 unsigned long entry;
280 unsigned long flags;
281
282 /* were we called with bad_dma_address? */
283 if (unlikely(dma_addr == DMA_MAPPING_ERROR)) {
284 WARN(1, KERN_ERR "Calgary: driver tried unmapping bad DMA "
285 "address 0x%Lx\n", dma_addr);
286 return;
287 }
288
289 entry = dma_addr >> PAGE_SHIFT;
290
291 BUG_ON(entry + npages > tbl->it_size);
292
293 tce_free(tbl, entry, npages);
294
295 spin_lock_irqsave(&tbl->it_lock, flags);
296
297 bitmap_clear(tbl->it_map, entry, npages);
298
299 spin_unlock_irqrestore(&tbl->it_lock, flags);
300}
301
302static inline struct iommu_table *find_iommu_table(struct device *dev)
303{
304 struct pci_dev *pdev;
305 struct pci_bus *pbus;
306 struct iommu_table *tbl;
307
308 pdev = to_pci_dev(dev);
309
310 /* search up the device tree for an iommu */
311 pbus = pdev->bus;
312 do {
313 tbl = pci_iommu(pbus);
314 if (tbl && tbl->it_busno == pbus->number)
315 break;
316 tbl = NULL;
317 pbus = pbus->parent;
318 } while (pbus);
319
320 BUG_ON(tbl && (tbl->it_busno != pbus->number));
321
322 return tbl;
323}
324
325static void calgary_unmap_sg(struct device *dev, struct scatterlist *sglist,
326 int nelems,enum dma_data_direction dir,
327 unsigned long attrs)
328{
329 struct iommu_table *tbl = find_iommu_table(dev);
330 struct scatterlist *s;
331 int i;
332
333 if (!translation_enabled(tbl))
334 return;
335
336 for_each_sg(sglist, s, nelems, i) {
337 unsigned int npages;
338 dma_addr_t dma = s->dma_address;
339 unsigned int dmalen = s->dma_length;
340
341 if (dmalen == 0)
342 break;
343
344 npages = iommu_num_pages(dma, dmalen, PAGE_SIZE);
345 iommu_free(tbl, dma, npages);
346 }
347}
348
349static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
350 int nelems, enum dma_data_direction dir,
351 unsigned long attrs)
352{
353 struct iommu_table *tbl = find_iommu_table(dev);
354 struct scatterlist *s;
355 unsigned long vaddr;
356 unsigned int npages;
357 unsigned long entry;
358 int i;
359
360 for_each_sg(sg, s, nelems, i) {
361 BUG_ON(!sg_page(s));
362
363 vaddr = (unsigned long) sg_virt(s);
364 npages = iommu_num_pages(vaddr, s->length, PAGE_SIZE);
365
366 entry = iommu_range_alloc(dev, tbl, npages);
367 if (entry == DMA_MAPPING_ERROR) {
368 /* makes sure unmap knows to stop */
369 s->dma_length = 0;
370 goto error;
371 }
372
373 s->dma_address = (entry << PAGE_SHIFT) | s->offset;
374
375 /* insert into HW table */
376 tce_build(tbl, entry, npages, vaddr & PAGE_MASK, dir);
377
378 s->dma_length = s->length;
379 }
380
381 return nelems;
382error:
383 calgary_unmap_sg(dev, sg, nelems, dir, 0);
384 for_each_sg(sg, s, nelems, i) {
385 sg->dma_address = DMA_MAPPING_ERROR;
386 sg->dma_length = 0;
387 }
388 return 0;
389}
390
391static dma_addr_t calgary_map_page(struct device *dev, struct page *page,
392 unsigned long offset, size_t size,
393 enum dma_data_direction dir,
394 unsigned long attrs)
395{
396 void *vaddr = page_address(page) + offset;
397 unsigned long uaddr;
398 unsigned int npages;
399 struct iommu_table *tbl = find_iommu_table(dev);
400
401 uaddr = (unsigned long)vaddr;
402 npages = iommu_num_pages(uaddr, size, PAGE_SIZE);
403
404 return iommu_alloc(dev, tbl, vaddr, npages, dir);
405}
406
407static void calgary_unmap_page(struct device *dev, dma_addr_t dma_addr,
408 size_t size, enum dma_data_direction dir,
409 unsigned long attrs)
410{
411 struct iommu_table *tbl = find_iommu_table(dev);
412 unsigned int npages;
413
414 npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
415 iommu_free(tbl, dma_addr, npages);
416}
417
418static void* calgary_alloc_coherent(struct device *dev, size_t size,
419 dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
420{
421 void *ret = NULL;
422 dma_addr_t mapping;
423 unsigned int npages, order;
424 struct iommu_table *tbl = find_iommu_table(dev);
425
426 size = PAGE_ALIGN(size); /* size rounded up to full pages */
427 npages = size >> PAGE_SHIFT;
428 order = get_order(size);
429
430 /* alloc enough pages (and possibly more) */
431 ret = (void *)__get_free_pages(flag, order);
432 if (!ret)
433 goto error;
434 memset(ret, 0, size);
435
436 /* set up tces to cover the allocated range */
437 mapping = iommu_alloc(dev, tbl, ret, npages, DMA_BIDIRECTIONAL);
438 if (mapping == DMA_MAPPING_ERROR)
439 goto free;
440 *dma_handle = mapping;
441 return ret;
442free:
443 free_pages((unsigned long)ret, get_order(size));
444 ret = NULL;
445error:
446 return ret;
447}
448
449static void calgary_free_coherent(struct device *dev, size_t size,
450 void *vaddr, dma_addr_t dma_handle,
451 unsigned long attrs)
452{
453 unsigned int npages;
454 struct iommu_table *tbl = find_iommu_table(dev);
455
456 size = PAGE_ALIGN(size);
457 npages = size >> PAGE_SHIFT;
458
459 iommu_free(tbl, dma_handle, npages);
460 free_pages((unsigned long)vaddr, get_order(size));
461}
462
463static const struct dma_map_ops calgary_dma_ops = {
464 .alloc = calgary_alloc_coherent,
465 .free = calgary_free_coherent,
466 .map_sg = calgary_map_sg,
467 .unmap_sg = calgary_unmap_sg,
468 .map_page = calgary_map_page,
469 .unmap_page = calgary_unmap_page,
470 .dma_supported = dma_direct_supported,
471 .mmap = dma_common_mmap,
472 .get_sgtable = dma_common_get_sgtable,
473};
474
475static inline void __iomem * busno_to_bbar(unsigned char num)
476{
477 return bus_info[num].bbar;
478}
479
480static inline int busno_to_phbid(unsigned char num)
481{
482 return bus_info[num].phbid;
483}
484
485static inline unsigned long split_queue_offset(unsigned char num)
486{
487 size_t idx = busno_to_phbid(num);
488
489 return split_queue_offsets[idx];
490}
491
492static inline unsigned long tar_offset(unsigned char num)
493{
494 size_t idx = busno_to_phbid(num);
495
496 return tar_offsets[idx];
497}
498
499static inline unsigned long phb_offset(unsigned char num)
500{
501 size_t idx = busno_to_phbid(num);
502
503 return phb_offsets[idx];
504}
505
506static inline void __iomem* calgary_reg(void __iomem *bar, unsigned long offset)
507{
508 unsigned long target = ((unsigned long)bar) | offset;
509 return (void __iomem*)target;
510}
511
512static inline int is_calioc2(unsigned short device)
513{
514 return (device == PCI_DEVICE_ID_IBM_CALIOC2);
515}
516
517static inline int is_calgary(unsigned short device)
518{
519 return (device == PCI_DEVICE_ID_IBM_CALGARY);
520}
521
522static inline int is_cal_pci_dev(unsigned short device)
523{
524 return (is_calgary(device) || is_calioc2(device));
525}
526
527static void calgary_tce_cache_blast(struct iommu_table *tbl)
528{
529 u64 val;
530 u32 aer;
531 int i = 0;
532 void __iomem *bbar = tbl->bbar;
533 void __iomem *target;
534
535 /* disable arbitration on the bus */
536 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
537 aer = readl(target);
538 writel(0, target);
539
540 /* read plssr to ensure it got there */
541 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
542 val = readl(target);
543
544 /* poll split queues until all DMA activity is done */
545 target = calgary_reg(bbar, split_queue_offset(tbl->it_busno));
546 do {
547 val = readq(target);
548 i++;
549 } while ((val & 0xff) != 0xff && i < 100);
550 if (i == 100)
551 pr_warn("PCI bus not quiesced, continuing anyway\n");
552
553 /* invalidate TCE cache */
554 target = calgary_reg(bbar, tar_offset(tbl->it_busno));
555 writeq(tbl->tar_val, target);
556
557 /* enable arbitration */
558 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
559 writel(aer, target);
560 (void)readl(target); /* flush */
561}
562
563static void calioc2_tce_cache_blast(struct iommu_table *tbl)
564{
565 void __iomem *bbar = tbl->bbar;
566 void __iomem *target;
567 u64 val64;
568 u32 val;
569 int i = 0;
570 int count = 1;
571 unsigned char bus = tbl->it_busno;
572
573begin:
574 printk(KERN_DEBUG "Calgary: CalIOC2 bus 0x%x entering tce cache blast "
575 "sequence - count %d\n", bus, count);
576
577 /* 1. using the Page Migration Control reg set SoftStop */
578 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
579 val = be32_to_cpu(readl(target));
580 printk(KERN_DEBUG "1a. read 0x%x [LE] from %p\n", val, target);
581 val |= PMR_SOFTSTOP;
582 printk(KERN_DEBUG "1b. writing 0x%x [LE] to %p\n", val, target);
583 writel(cpu_to_be32(val), target);
584
585 /* 2. poll split queues until all DMA activity is done */
586 printk(KERN_DEBUG "2a. starting to poll split queues\n");
587 target = calgary_reg(bbar, split_queue_offset(bus));
588 do {
589 val64 = readq(target);
590 i++;
591 } while ((val64 & 0xff) != 0xff && i < 100);
592 if (i == 100)
593 pr_warn("CalIOC2: PCI bus not quiesced, continuing anyway\n");
594
595 /* 3. poll Page Migration DEBUG for SoftStopFault */
596 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
597 val = be32_to_cpu(readl(target));
598 printk(KERN_DEBUG "3. read 0x%x [LE] from %p\n", val, target);
599
600 /* 4. if SoftStopFault - goto (1) */
601 if (val & PMR_SOFTSTOPFAULT) {
602 if (++count < 100)
603 goto begin;
604 else {
605 pr_warn("CalIOC2: too many SoftStopFaults, aborting TCE cache flush sequence!\n");
606 return; /* pray for the best */
607 }
608 }
609
610 /* 5. Slam into HardStop by reading PHB_PAGE_MIG_CTRL */
611 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
612 printk(KERN_DEBUG "5a. slamming into HardStop by reading %p\n", target);
613 val = be32_to_cpu(readl(target));
614 printk(KERN_DEBUG "5b. read 0x%x [LE] from %p\n", val, target);
615 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
616 val = be32_to_cpu(readl(target));
617 printk(KERN_DEBUG "5c. read 0x%x [LE] from %p (debug)\n", val, target);
618
619 /* 6. invalidate TCE cache */
620 printk(KERN_DEBUG "6. invalidating TCE cache\n");
621 target = calgary_reg(bbar, tar_offset(bus));
622 writeq(tbl->tar_val, target);
623
624 /* 7. Re-read PMCR */
625 printk(KERN_DEBUG "7a. Re-reading PMCR\n");
626 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
627 val = be32_to_cpu(readl(target));
628 printk(KERN_DEBUG "7b. read 0x%x [LE] from %p\n", val, target);
629
630 /* 8. Remove HardStop */
631 printk(KERN_DEBUG "8a. removing HardStop from PMCR\n");
632 target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
633 val = 0;
634 printk(KERN_DEBUG "8b. writing 0x%x [LE] to %p\n", val, target);
635 writel(cpu_to_be32(val), target);
636 val = be32_to_cpu(readl(target));
637 printk(KERN_DEBUG "8c. read 0x%x [LE] from %p\n", val, target);
638}
639
640static void __init calgary_reserve_mem_region(struct pci_dev *dev, u64 start,
641 u64 limit)
642{
643 unsigned int numpages;
644
645 limit = limit | 0xfffff;
646 limit++;
647
648 numpages = ((limit - start) >> PAGE_SHIFT);
649 iommu_range_reserve(pci_iommu(dev->bus), start, numpages);
650}
651
652static void __init calgary_reserve_peripheral_mem_1(struct pci_dev *dev)
653{
654 void __iomem *target;
655 u64 low, high, sizelow;
656 u64 start, limit;
657 struct iommu_table *tbl = pci_iommu(dev->bus);
658 unsigned char busnum = dev->bus->number;
659 void __iomem *bbar = tbl->bbar;
660
661 /* peripheral MEM_1 region */
662 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_LOW);
663 low = be32_to_cpu(readl(target));
664 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_HIGH);
665 high = be32_to_cpu(readl(target));
666 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_SIZE);
667 sizelow = be32_to_cpu(readl(target));
668
669 start = (high << 32) | low;
670 limit = sizelow;
671
672 calgary_reserve_mem_region(dev, start, limit);
673}
674
675static void __init calgary_reserve_peripheral_mem_2(struct pci_dev *dev)
676{
677 void __iomem *target;
678 u32 val32;
679 u64 low, high, sizelow, sizehigh;
680 u64 start, limit;
681 struct iommu_table *tbl = pci_iommu(dev->bus);
682 unsigned char busnum = dev->bus->number;
683 void __iomem *bbar = tbl->bbar;
684
685 /* is it enabled? */
686 target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
687 val32 = be32_to_cpu(readl(target));
688 if (!(val32 & PHB_MEM2_ENABLE))
689 return;
690
691 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_LOW);
692 low = be32_to_cpu(readl(target));
693 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_HIGH);
694 high = be32_to_cpu(readl(target));
695 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_LOW);
696 sizelow = be32_to_cpu(readl(target));
697 target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_HIGH);
698 sizehigh = be32_to_cpu(readl(target));
699
700 start = (high << 32) | low;
701 limit = (sizehigh << 32) | sizelow;
702
703 calgary_reserve_mem_region(dev, start, limit);
704}
705
706/*
707 * some regions of the IO address space do not get translated, so we
708 * must not give devices IO addresses in those regions. The regions
709 * are the 640KB-1MB region and the two PCI peripheral memory holes.
710 * Reserve all of them in the IOMMU bitmap to avoid giving them out
711 * later.
712 */
713static void __init calgary_reserve_regions(struct pci_dev *dev)
714{
715 unsigned int npages;
716 u64 start;
717 struct iommu_table *tbl = pci_iommu(dev->bus);
718
719 /* avoid the BIOS/VGA first 640KB-1MB region */
720 /* for CalIOC2 - avoid the entire first MB */
721 if (is_calgary(dev->device)) {
722 start = (640 * 1024);
723 npages = ((1024 - 640) * 1024) >> PAGE_SHIFT;
724 } else { /* calioc2 */
725 start = 0;
726 npages = (1 * 1024 * 1024) >> PAGE_SHIFT;
727 }
728 iommu_range_reserve(tbl, start, npages);
729
730 /* reserve the two PCI peripheral memory regions in IO space */
731 calgary_reserve_peripheral_mem_1(dev);
732 calgary_reserve_peripheral_mem_2(dev);
733}
734
735static int __init calgary_setup_tar(struct pci_dev *dev, void __iomem *bbar)
736{
737 u64 val64;
738 u64 table_phys;
739 void __iomem *target;
740 int ret;
741 struct iommu_table *tbl;
742
743 /* build TCE tables for each PHB */
744 ret = build_tce_table(dev, bbar);
745 if (ret)
746 return ret;
747
748 tbl = pci_iommu(dev->bus);
749 tbl->it_base = (unsigned long)bus_info[dev->bus->number].tce_space;
750
751 if (is_kdump_kernel())
752 calgary_init_bitmap_from_tce_table(tbl);
753 else
754 tce_free(tbl, 0, tbl->it_size);
755
756 if (is_calgary(dev->device))
757 tbl->chip_ops = &calgary_chip_ops;
758 else if (is_calioc2(dev->device))
759 tbl->chip_ops = &calioc2_chip_ops;
760 else
761 BUG();
762
763 calgary_reserve_regions(dev);
764
765 /* set TARs for each PHB */
766 target = calgary_reg(bbar, tar_offset(dev->bus->number));
767 val64 = be64_to_cpu(readq(target));
768
769 /* zero out all TAR bits under sw control */
770 val64 &= ~TAR_SW_BITS;
771 table_phys = (u64)__pa(tbl->it_base);
772
773 val64 |= table_phys;
774
775 BUG_ON(specified_table_size > TCE_TABLE_SIZE_8M);
776 val64 |= (u64) specified_table_size;
777
778 tbl->tar_val = cpu_to_be64(val64);
779
780 writeq(tbl->tar_val, target);
781 readq(target); /* flush */
782
783 return 0;
784}
785
786static void __init calgary_free_bus(struct pci_dev *dev)
787{
788 u64 val64;
789 struct iommu_table *tbl = pci_iommu(dev->bus);
790 void __iomem *target;
791 unsigned int bitmapsz;
792
793 target = calgary_reg(tbl->bbar, tar_offset(dev->bus->number));
794 val64 = be64_to_cpu(readq(target));
795 val64 &= ~TAR_SW_BITS;
796 writeq(cpu_to_be64(val64), target);
797 readq(target); /* flush */
798
799 bitmapsz = tbl->it_size / BITS_PER_BYTE;
800 free_pages((unsigned long)tbl->it_map, get_order(bitmapsz));
801 tbl->it_map = NULL;
802
803 kfree(tbl);
804
805 set_pci_iommu(dev->bus, NULL);
806
807 /* Can't free bootmem allocated memory after system is up :-( */
808 bus_info[dev->bus->number].tce_space = NULL;
809}
810
811static void calgary_dump_error_regs(struct iommu_table *tbl)
812{
813 void __iomem *bbar = tbl->bbar;
814 void __iomem *target;
815 u32 csr, plssr;
816
817 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
818 csr = be32_to_cpu(readl(target));
819
820 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
821 plssr = be32_to_cpu(readl(target));
822
823 /* If no error, the agent ID in the CSR is not valid */
824 pr_emerg("DMA error on Calgary PHB 0x%x, 0x%08x@CSR 0x%08x@PLSSR\n",
825 tbl->it_busno, csr, plssr);
826}
827
828static void calioc2_dump_error_regs(struct iommu_table *tbl)
829{
830 void __iomem *bbar = tbl->bbar;
831 u32 csr, csmr, plssr, mck, rcstat;
832 void __iomem *target;
833 unsigned long phboff = phb_offset(tbl->it_busno);
834 unsigned long erroff;
835 u32 errregs[7];
836 int i;
837
838 /* dump CSR */
839 target = calgary_reg(bbar, phboff | PHB_CSR_OFFSET);
840 csr = be32_to_cpu(readl(target));
841 /* dump PLSSR */
842 target = calgary_reg(bbar, phboff | PHB_PLSSR_OFFSET);
843 plssr = be32_to_cpu(readl(target));
844 /* dump CSMR */
845 target = calgary_reg(bbar, phboff | 0x290);
846 csmr = be32_to_cpu(readl(target));
847 /* dump mck */
848 target = calgary_reg(bbar, phboff | 0x800);
849 mck = be32_to_cpu(readl(target));
850
851 pr_emerg("DMA error on CalIOC2 PHB 0x%x\n", tbl->it_busno);
852
853 pr_emerg("0x%08x@CSR 0x%08x@PLSSR 0x%08x@CSMR 0x%08x@MCK\n",
854 csr, plssr, csmr, mck);
855
856 /* dump rest of error regs */
857 pr_emerg("");
858 for (i = 0; i < ARRAY_SIZE(errregs); i++) {
859 /* err regs are at 0x810 - 0x870 */
860 erroff = (0x810 + (i * 0x10));
861 target = calgary_reg(bbar, phboff | erroff);
862 errregs[i] = be32_to_cpu(readl(target));
863 pr_cont("0x%08x@0x%lx ", errregs[i], erroff);
864 }
865 pr_cont("\n");
866
867 /* root complex status */
868 target = calgary_reg(bbar, phboff | PHB_ROOT_COMPLEX_STATUS);
869 rcstat = be32_to_cpu(readl(target));
870 printk(KERN_EMERG "Calgary: 0x%08x@0x%x\n", rcstat,
871 PHB_ROOT_COMPLEX_STATUS);
872}
873
874static void calgary_watchdog(struct timer_list *t)
875{
876 struct iommu_table *tbl = from_timer(tbl, t, watchdog_timer);
877 void __iomem *bbar = tbl->bbar;
878 u32 val32;
879 void __iomem *target;
880
881 target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
882 val32 = be32_to_cpu(readl(target));
883
884 /* If no error, the agent ID in the CSR is not valid */
885 if (val32 & CSR_AGENT_MASK) {
886 tbl->chip_ops->dump_error_regs(tbl);
887
888 /* reset error */
889 writel(0, target);
890
891 /* Disable bus that caused the error */
892 target = calgary_reg(bbar, phb_offset(tbl->it_busno) |
893 PHB_CONFIG_RW_OFFSET);
894 val32 = be32_to_cpu(readl(target));
895 val32 |= PHB_SLOT_DISABLE;
896 writel(cpu_to_be32(val32), target);
897 readl(target); /* flush */
898 } else {
899 /* Reset the timer */
900 mod_timer(&tbl->watchdog_timer, jiffies + 2 * HZ);
901 }
902}
903
904static void __init calgary_set_split_completion_timeout(void __iomem *bbar,
905 unsigned char busnum, unsigned long timeout)
906{
907 u64 val64;
908 void __iomem *target;
909 unsigned int phb_shift = ~0; /* silence gcc */
910 u64 mask;
911
912 switch (busno_to_phbid(busnum)) {
913 case 0: phb_shift = (63 - 19);
914 break;
915 case 1: phb_shift = (63 - 23);
916 break;
917 case 2: phb_shift = (63 - 27);
918 break;
919 case 3: phb_shift = (63 - 35);
920 break;
921 default:
922 BUG_ON(busno_to_phbid(busnum));
923 }
924
925 target = calgary_reg(bbar, CALGARY_CONFIG_REG);
926 val64 = be64_to_cpu(readq(target));
927
928 /* zero out this PHB's timer bits */
929 mask = ~(0xFUL << phb_shift);
930 val64 &= mask;
931 val64 |= (timeout << phb_shift);
932 writeq(cpu_to_be64(val64), target);
933 readq(target); /* flush */
934}
935
936static void __init calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev)
937{
938 unsigned char busnum = dev->bus->number;
939 void __iomem *bbar = tbl->bbar;
940 void __iomem *target;
941 u32 val;
942
943 /*
944 * CalIOC2 designers recommend setting bit 8 in 0xnDB0 to 1
945 */
946 target = calgary_reg(bbar, phb_offset(busnum) | PHB_SAVIOR_L2);
947 val = cpu_to_be32(readl(target));
948 val |= 0x00800000;
949 writel(cpu_to_be32(val), target);
950}
951
952static void __init calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev)
953{
954 unsigned char busnum = dev->bus->number;
955
956 /*
957 * Give split completion a longer timeout on bus 1 for aic94xx
958 * http://bugzilla.kernel.org/show_bug.cgi?id=7180
959 */
960 if (is_calgary(dev->device) && (busnum == 1))
961 calgary_set_split_completion_timeout(tbl->bbar, busnum,
962 CCR_2SEC_TIMEOUT);
963}
964
965static void __init calgary_enable_translation(struct pci_dev *dev)
966{
967 u32 val32;
968 unsigned char busnum;
969 void __iomem *target;
970 void __iomem *bbar;
971 struct iommu_table *tbl;
972
973 busnum = dev->bus->number;
974 tbl = pci_iommu(dev->bus);
975 bbar = tbl->bbar;
976
977 /* enable TCE in PHB Config Register */
978 target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
979 val32 = be32_to_cpu(readl(target));
980 val32 |= PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE;
981
982 printk(KERN_INFO "Calgary: enabling translation on %s PHB %#x\n",
983 (dev->device == PCI_DEVICE_ID_IBM_CALGARY) ?
984 "Calgary" : "CalIOC2", busnum);
985 printk(KERN_INFO "Calgary: errant DMAs will now be prevented on this "
986 "bus.\n");
987
988 writel(cpu_to_be32(val32), target);
989 readl(target); /* flush */
990
991 timer_setup(&tbl->watchdog_timer, calgary_watchdog, 0);
992 mod_timer(&tbl->watchdog_timer, jiffies);
993}
994
995static void __init calgary_disable_translation(struct pci_dev *dev)
996{
997 u32 val32;
998 unsigned char busnum;
999 void __iomem *target;
1000 void __iomem *bbar;
1001 struct iommu_table *tbl;
1002
1003 busnum = dev->bus->number;
1004 tbl = pci_iommu(dev->bus);
1005 bbar = tbl->bbar;
1006
1007 /* disable TCE in PHB Config Register */
1008 target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
1009 val32 = be32_to_cpu(readl(target));
1010 val32 &= ~(PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE);
1011
1012 printk(KERN_INFO "Calgary: disabling translation on PHB %#x!\n", busnum);
1013 writel(cpu_to_be32(val32), target);
1014 readl(target); /* flush */
1015
1016 del_timer_sync(&tbl->watchdog_timer);
1017}
1018
1019static void __init calgary_init_one_nontraslated(struct pci_dev *dev)
1020{
1021 pci_dev_get(dev);
1022 set_pci_iommu(dev->bus, NULL);
1023
1024 /* is the device behind a bridge? */
1025 if (dev->bus->parent)
1026 dev->bus->parent->self = dev;
1027 else
1028 dev->bus->self = dev;
1029}
1030
1031static int __init calgary_init_one(struct pci_dev *dev)
1032{
1033 void __iomem *bbar;
1034 struct iommu_table *tbl;
1035 int ret;
1036
1037 bbar = busno_to_bbar(dev->bus->number);
1038 ret = calgary_setup_tar(dev, bbar);
1039 if (ret)
1040 goto done;
1041
1042 pci_dev_get(dev);
1043
1044 if (dev->bus->parent) {
1045 if (dev->bus->parent->self)
1046 printk(KERN_WARNING "Calgary: IEEEE, dev %p has "
1047 "bus->parent->self!\n", dev);
1048 dev->bus->parent->self = dev;
1049 } else
1050 dev->bus->self = dev;
1051
1052 tbl = pci_iommu(dev->bus);
1053 tbl->chip_ops->handle_quirks(tbl, dev);
1054
1055 calgary_enable_translation(dev);
1056
1057 return 0;
1058
1059done:
1060 return ret;
1061}
1062
1063static int __init calgary_locate_bbars(void)
1064{
1065 int ret;
1066 int rioidx, phb, bus;
1067 void __iomem *bbar;
1068 void __iomem *target;
1069 unsigned long offset;
1070 u8 start_bus, end_bus;
1071 u32 val;
1072
1073 ret = -ENODATA;
1074 for (rioidx = 0; rioidx < rio_table_hdr->num_rio_dev; rioidx++) {
1075 struct rio_detail *rio = rio_devs[rioidx];
1076
1077 if ((rio->type != COMPAT_CALGARY) && (rio->type != ALT_CALGARY))
1078 continue;
1079
1080 /* map entire 1MB of Calgary config space */
1081 bbar = ioremap_nocache(rio->BBAR, 1024 * 1024);
1082 if (!bbar)
1083 goto error;
1084
1085 for (phb = 0; phb < PHBS_PER_CALGARY; phb++) {
1086 offset = phb_debug_offsets[phb] | PHB_DEBUG_STUFF_OFFSET;
1087 target = calgary_reg(bbar, offset);
1088
1089 val = be32_to_cpu(readl(target));
1090
1091 start_bus = (u8)((val & 0x00FF0000) >> 16);
1092 end_bus = (u8)((val & 0x0000FF00) >> 8);
1093
1094 if (end_bus) {
1095 for (bus = start_bus; bus <= end_bus; bus++) {
1096 bus_info[bus].bbar = bbar;
1097 bus_info[bus].phbid = phb;
1098 }
1099 } else {
1100 bus_info[start_bus].bbar = bbar;
1101 bus_info[start_bus].phbid = phb;
1102 }
1103 }
1104 }
1105
1106 return 0;
1107
1108error:
1109 /* scan bus_info and iounmap any bbars we previously ioremap'd */
1110 for (bus = 0; bus < ARRAY_SIZE(bus_info); bus++)
1111 if (bus_info[bus].bbar)
1112 iounmap(bus_info[bus].bbar);
1113
1114 return ret;
1115}
1116
1117static int __init calgary_init(void)
1118{
1119 int ret;
1120 struct pci_dev *dev = NULL;
1121 struct calgary_bus_info *info;
1122
1123 ret = calgary_locate_bbars();
1124 if (ret)
1125 return ret;
1126
1127 /* Purely for kdump kernel case */
1128 if (is_kdump_kernel())
1129 get_tce_space_from_tar();
1130
1131 do {
1132 dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
1133 if (!dev)
1134 break;
1135 if (!is_cal_pci_dev(dev->device))
1136 continue;
1137
1138 info = &bus_info[dev->bus->number];
1139 if (info->translation_disabled) {
1140 calgary_init_one_nontraslated(dev);
1141 continue;
1142 }
1143
1144 if (!info->tce_space && !translate_empty_slots)
1145 continue;
1146
1147 ret = calgary_init_one(dev);
1148 if (ret)
1149 goto error;
1150 } while (1);
1151
1152 dev = NULL;
1153 for_each_pci_dev(dev) {
1154 struct iommu_table *tbl;
1155
1156 tbl = find_iommu_table(&dev->dev);
1157
1158 if (translation_enabled(tbl))
1159 dev->dev.dma_ops = &calgary_dma_ops;
1160 }
1161
1162 return ret;
1163
1164error:
1165 do {
1166 dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
1167 if (!dev)
1168 break;
1169 if (!is_cal_pci_dev(dev->device))
1170 continue;
1171
1172 info = &bus_info[dev->bus->number];
1173 if (info->translation_disabled) {
1174 pci_dev_put(dev);
1175 continue;
1176 }
1177 if (!info->tce_space && !translate_empty_slots)
1178 continue;
1179
1180 calgary_disable_translation(dev);
1181 calgary_free_bus(dev);
1182 pci_dev_put(dev); /* Undo calgary_init_one()'s pci_dev_get() */
1183 dev->dev.dma_ops = NULL;
1184 } while (1);
1185
1186 return ret;
1187}
1188
1189static inline int __init determine_tce_table_size(void)
1190{
1191 int ret;
1192
1193 if (specified_table_size != TCE_TABLE_SIZE_UNSPECIFIED)
1194 return specified_table_size;
1195
1196 if (is_kdump_kernel() && saved_max_pfn) {
1197 /*
1198 * Table sizes are from 0 to 7 (TCE_TABLE_SIZE_64K to
1199 * TCE_TABLE_SIZE_8M). Table size 0 has 8K entries and each
1200 * larger table size has twice as many entries, so shift the
1201 * max ram address by 13 to divide by 8K and then look at the
1202 * order of the result to choose between 0-7.
1203 */
1204 ret = get_order((saved_max_pfn * PAGE_SIZE) >> 13);
1205 if (ret > TCE_TABLE_SIZE_8M)
1206 ret = TCE_TABLE_SIZE_8M;
1207 } else {
1208 /*
1209 * Use 8M by default (suggested by Muli) if it's not
1210 * kdump kernel and saved_max_pfn isn't set.
1211 */
1212 ret = TCE_TABLE_SIZE_8M;
1213 }
1214
1215 return ret;
1216}
1217
1218static int __init build_detail_arrays(void)
1219{
1220 unsigned long ptr;
1221 unsigned numnodes, i;
1222 int scal_detail_size, rio_detail_size;
1223
1224 numnodes = rio_table_hdr->num_scal_dev;
1225 if (numnodes > MAX_NUMNODES){
1226 printk(KERN_WARNING
1227 "Calgary: MAX_NUMNODES too low! Defined as %d, "
1228 "but system has %d nodes.\n",
1229 MAX_NUMNODES, numnodes);
1230 return -ENODEV;
1231 }
1232
1233 switch (rio_table_hdr->version){
1234 case 2:
1235 scal_detail_size = 11;
1236 rio_detail_size = 13;
1237 break;
1238 case 3:
1239 scal_detail_size = 12;
1240 rio_detail_size = 15;
1241 break;
1242 default:
1243 printk(KERN_WARNING
1244 "Calgary: Invalid Rio Grande Table Version: %d\n",
1245 rio_table_hdr->version);
1246 return -EPROTO;
1247 }
1248
1249 ptr = ((unsigned long)rio_table_hdr) + 3;
1250 for (i = 0; i < numnodes; i++, ptr += scal_detail_size)
1251 scal_devs[i] = (struct scal_detail *)ptr;
1252
1253 for (i = 0; i < rio_table_hdr->num_rio_dev;
1254 i++, ptr += rio_detail_size)
1255 rio_devs[i] = (struct rio_detail *)ptr;
1256
1257 return 0;
1258}
1259
1260static int __init calgary_bus_has_devices(int bus, unsigned short pci_dev)
1261{
1262 int dev;
1263 u32 val;
1264
1265 if (pci_dev == PCI_DEVICE_ID_IBM_CALIOC2) {
1266 /*
1267 * FIXME: properly scan for devices across the
1268 * PCI-to-PCI bridge on every CalIOC2 port.
1269 */
1270 return 1;
1271 }
1272
1273 for (dev = 1; dev < 8; dev++) {
1274 val = read_pci_config(bus, dev, 0, 0);
1275 if (val != 0xffffffff)
1276 break;
1277 }
1278 return (val != 0xffffffff);
1279}
1280
1281/*
1282 * calgary_init_bitmap_from_tce_table():
1283 * Function for kdump case. In the second/kdump kernel initialize
1284 * the bitmap based on the tce table entries obtained from first kernel
1285 */
1286static void calgary_init_bitmap_from_tce_table(struct iommu_table *tbl)
1287{
1288 u64 *tp;
1289 unsigned int index;
1290 tp = ((u64 *)tbl->it_base);
1291 for (index = 0 ; index < tbl->it_size; index++) {
1292 if (*tp != 0x0)
1293 set_bit(index, tbl->it_map);
1294 tp++;
1295 }
1296}
1297
1298/*
1299 * get_tce_space_from_tar():
1300 * Function for kdump case. Get the tce tables from first kernel
1301 * by reading the contents of the base address register of calgary iommu
1302 */
1303static void __init get_tce_space_from_tar(void)
1304{
1305 int bus;
1306 void __iomem *target;
1307 unsigned long tce_space;
1308
1309 for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
1310 struct calgary_bus_info *info = &bus_info[bus];
1311 unsigned short pci_device;
1312 u32 val;
1313
1314 val = read_pci_config(bus, 0, 0, 0);
1315 pci_device = (val & 0xFFFF0000) >> 16;
1316
1317 if (!is_cal_pci_dev(pci_device))
1318 continue;
1319 if (info->translation_disabled)
1320 continue;
1321
1322 if (calgary_bus_has_devices(bus, pci_device) ||
1323 translate_empty_slots) {
1324 target = calgary_reg(bus_info[bus].bbar,
1325 tar_offset(bus));
1326 tce_space = be64_to_cpu(readq(target));
1327 tce_space = tce_space & TAR_SW_BITS;
1328
1329 tce_space = tce_space & (~specified_table_size);
1330 info->tce_space = (u64 *)__va(tce_space);
1331 }
1332 }
1333 return;
1334}
1335
1336static int __init calgary_iommu_init(void)
1337{
1338 int ret;
1339
1340 /* ok, we're trying to use Calgary - let's roll */
1341 printk(KERN_INFO "PCI-DMA: Using Calgary IOMMU\n");
1342
1343 ret = calgary_init();
1344 if (ret) {
1345 printk(KERN_ERR "PCI-DMA: Calgary init failed %d, "
1346 "falling back to no_iommu\n", ret);
1347 return ret;
1348 }
1349
1350 return 0;
1351}
1352
1353int __init detect_calgary(void)
1354{
1355 int bus;
1356 void *tbl;
1357 int calgary_found = 0;
1358 unsigned long ptr;
1359 unsigned int offset, prev_offset;
1360 int ret;
1361
1362 /*
1363 * if the user specified iommu=off or iommu=soft or we found
1364 * another HW IOMMU already, bail out.
1365 */
1366 if (no_iommu || iommu_detected)
1367 return -ENODEV;
1368
1369 if (!use_calgary)
1370 return -ENODEV;
1371
1372 if (!early_pci_allowed())
1373 return -ENODEV;
1374
1375 printk(KERN_DEBUG "Calgary: detecting Calgary via BIOS EBDA area\n");
1376
1377 ptr = (unsigned long)phys_to_virt(get_bios_ebda());
1378
1379 rio_table_hdr = NULL;
1380 prev_offset = 0;
1381 offset = 0x180;
1382 /*
1383 * The next offset is stored in the 1st word.
1384 * Only parse up until the offset increases:
1385 */
1386 while (offset > prev_offset) {
1387 /* The block id is stored in the 2nd word */
1388 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752){
1389 /* set the pointer past the offset & block id */
1390 rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
1391 break;
1392 }
1393 prev_offset = offset;
1394 offset = *((unsigned short *)(ptr + offset));
1395 }
1396 if (!rio_table_hdr) {
1397 printk(KERN_DEBUG "Calgary: Unable to locate Rio Grande table "
1398 "in EBDA - bailing!\n");
1399 return -ENODEV;
1400 }
1401
1402 ret = build_detail_arrays();
1403 if (ret) {
1404 printk(KERN_DEBUG "Calgary: build_detail_arrays ret %d\n", ret);
1405 return -ENOMEM;
1406 }
1407
1408 specified_table_size = determine_tce_table_size();
1409
1410 for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
1411 struct calgary_bus_info *info = &bus_info[bus];
1412 unsigned short pci_device;
1413 u32 val;
1414
1415 val = read_pci_config(bus, 0, 0, 0);
1416 pci_device = (val & 0xFFFF0000) >> 16;
1417
1418 if (!is_cal_pci_dev(pci_device))
1419 continue;
1420
1421 if (info->translation_disabled)
1422 continue;
1423
1424 if (calgary_bus_has_devices(bus, pci_device) ||
1425 translate_empty_slots) {
1426 /*
1427 * If it is kdump kernel, find and use tce tables
1428 * from first kernel, else allocate tce tables here
1429 */
1430 if (!is_kdump_kernel()) {
1431 tbl = alloc_tce_table();
1432 if (!tbl)
1433 goto cleanup;
1434 info->tce_space = tbl;
1435 }
1436 calgary_found = 1;
1437 }
1438 }
1439
1440 printk(KERN_DEBUG "Calgary: finished detection, Calgary %s\n",
1441 calgary_found ? "found" : "not found");
1442
1443 if (calgary_found) {
1444 iommu_detected = 1;
1445 calgary_detected = 1;
1446 printk(KERN_INFO "PCI-DMA: Calgary IOMMU detected.\n");
1447 printk(KERN_INFO "PCI-DMA: Calgary TCE table spec is %d\n",
1448 specified_table_size);
1449
1450 x86_init.iommu.iommu_init = calgary_iommu_init;
1451 }
1452 return calgary_found;
1453
1454cleanup:
1455 for (--bus; bus >= 0; --bus) {
1456 struct calgary_bus_info *info = &bus_info[bus];
1457
1458 if (info->tce_space)
1459 free_tce_table(info->tce_space);
1460 }
1461 return -ENOMEM;
1462}
1463
1464static int __init calgary_parse_options(char *p)
1465{
1466 unsigned int bridge;
1467 unsigned long val;
1468 size_t len;
1469 ssize_t ret;
1470
1471 while (*p) {
1472 if (!strncmp(p, "64k", 3))
1473 specified_table_size = TCE_TABLE_SIZE_64K;
1474 else if (!strncmp(p, "128k", 4))
1475 specified_table_size = TCE_TABLE_SIZE_128K;
1476 else if (!strncmp(p, "256k", 4))
1477 specified_table_size = TCE_TABLE_SIZE_256K;
1478 else if (!strncmp(p, "512k", 4))
1479 specified_table_size = TCE_TABLE_SIZE_512K;
1480 else if (!strncmp(p, "1M", 2))
1481 specified_table_size = TCE_TABLE_SIZE_1M;
1482 else if (!strncmp(p, "2M", 2))
1483 specified_table_size = TCE_TABLE_SIZE_2M;
1484 else if (!strncmp(p, "4M", 2))
1485 specified_table_size = TCE_TABLE_SIZE_4M;
1486 else if (!strncmp(p, "8M", 2))
1487 specified_table_size = TCE_TABLE_SIZE_8M;
1488
1489 len = strlen("translate_empty_slots");
1490 if (!strncmp(p, "translate_empty_slots", len))
1491 translate_empty_slots = 1;
1492
1493 len = strlen("disable");
1494 if (!strncmp(p, "disable", len)) {
1495 p += len;
1496 if (*p == '=')
1497 ++p;
1498 if (*p == '\0')
1499 break;
1500 ret = kstrtoul(p, 0, &val);
1501 if (ret)
1502 break;
1503
1504 bridge = val;
1505 if (bridge < MAX_PHB_BUS_NUM) {
1506 printk(KERN_INFO "Calgary: disabling "
1507 "translation for PHB %#x\n", bridge);
1508 bus_info[bridge].translation_disabled = 1;
1509 }
1510 }
1511
1512 p = strpbrk(p, ",");
1513 if (!p)
1514 break;
1515
1516 p++; /* skip ',' */
1517 }
1518 return 1;
1519}
1520__setup("calgary=", calgary_parse_options);
1521
1522static void __init calgary_fixup_one_tce_space(struct pci_dev *dev)
1523{
1524 struct iommu_table *tbl;
1525 unsigned int npages;
1526 int i;
1527
1528 tbl = pci_iommu(dev->bus);
1529
1530 for (i = 0; i < 4; i++) {
1531 struct resource *r = &dev->resource[PCI_BRIDGE_RESOURCES + i];
1532
1533 /* Don't give out TCEs that map MEM resources */
1534 if (!(r->flags & IORESOURCE_MEM))
1535 continue;
1536
1537 /* 0-based? we reserve the whole 1st MB anyway */
1538 if (!r->start)
1539 continue;
1540
1541 /* cover the whole region */
1542 npages = resource_size(r) >> PAGE_SHIFT;
1543 npages++;
1544
1545 iommu_range_reserve(tbl, r->start, npages);
1546 }
1547}
1548
1549static int __init calgary_fixup_tce_spaces(void)
1550{
1551 struct pci_dev *dev = NULL;
1552 struct calgary_bus_info *info;
1553
1554 if (no_iommu || swiotlb || !calgary_detected)
1555 return -ENODEV;
1556
1557 printk(KERN_DEBUG "Calgary: fixing up tce spaces\n");
1558
1559 do {
1560 dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
1561 if (!dev)
1562 break;
1563 if (!is_cal_pci_dev(dev->device))
1564 continue;
1565
1566 info = &bus_info[dev->bus->number];
1567 if (info->translation_disabled)
1568 continue;
1569
1570 if (!info->tce_space)
1571 continue;
1572
1573 calgary_fixup_one_tce_space(dev);
1574
1575 } while (1);
1576
1577 return 0;
1578}
1579
1580/*
1581 * We need to be call after pcibios_assign_resources (fs_initcall level)
1582 * and before device_initcall.
1583 */
1584rootfs_initcall(calgary_fixup_tce_spaces);
1585
1586IOMMU_INIT_POST(detect_calgary);