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Merge branch 'broonie/spi-next' of git://git.kernel.org/pub/scm/linux/kernel/git...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / s390 / pci / pci.c
1 /*
2 * Copyright IBM Corp. 2012
3 *
4 * Author(s):
5 * Jan Glauber <jang@linux.vnet.ibm.com>
6 *
7 * The System z PCI code is a rewrite from a prototype by
8 * the following people (Kudoz!):
9 * Alexander Schmidt
10 * Christoph Raisch
11 * Hannes Hering
12 * Hoang-Nam Nguyen
13 * Jan-Bernd Themann
14 * Stefan Roscher
15 * Thomas Klein
16 */
17
18 #define COMPONENT "zPCI"
19 #define pr_fmt(fmt) COMPONENT ": " fmt
20
21 #include <linux/kernel.h>
22 #include <linux/slab.h>
23 #include <linux/err.h>
24 #include <linux/export.h>
25 #include <linux/delay.h>
26 #include <linux/irq.h>
27 #include <linux/kernel_stat.h>
28 #include <linux/seq_file.h>
29 #include <linux/pci.h>
30 #include <linux/msi.h>
31
32 #include <asm/isc.h>
33 #include <asm/airq.h>
34 #include <asm/facility.h>
35 #include <asm/pci_insn.h>
36 #include <asm/pci_clp.h>
37 #include <asm/pci_dma.h>
38
39 #define DEBUG /* enable pr_debug */
40
41 #define SIC_IRQ_MODE_ALL 0
42 #define SIC_IRQ_MODE_SINGLE 1
43
44 #define ZPCI_NR_DMA_SPACES 1
45 #define ZPCI_MSI_VEC_BITS 6
46 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
47
48 /* list of all detected zpci devices */
49 LIST_HEAD(zpci_list);
50 EXPORT_SYMBOL_GPL(zpci_list);
51 DEFINE_MUTEX(zpci_list_lock);
52 EXPORT_SYMBOL_GPL(zpci_list_lock);
53
54 struct pci_hp_callback_ops hotplug_ops;
55 EXPORT_SYMBOL_GPL(hotplug_ops);
56
57 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
58 static DEFINE_SPINLOCK(zpci_domain_lock);
59
60 struct callback {
61 irq_handler_t handler;
62 void *data;
63 };
64
65 struct zdev_irq_map {
66 unsigned long aibv; /* AI bit vector */
67 int msi_vecs; /* consecutive MSI-vectors used */
68 int __unused;
69 struct callback cb[ZPCI_NR_MSI_VECS]; /* callback handler array */
70 spinlock_t lock; /* protect callbacks against de-reg */
71 };
72
73 struct intr_bucket {
74 /* amap of adapters, one bit per dev, corresponds to one irq nr */
75 unsigned long *alloc;
76 /* AI summary bit, global page for all devices */
77 unsigned long *aisb;
78 /* pointer to aibv and callback data in zdev */
79 struct zdev_irq_map *imap[ZPCI_NR_DEVICES];
80 /* protects the whole bucket struct */
81 spinlock_t lock;
82 };
83
84 static struct intr_bucket *bucket;
85
86 /* Adapter local summary indicator */
87 static u8 *zpci_irq_si;
88
89 static atomic_t irq_retries = ATOMIC_INIT(0);
90
91 /* I/O Map */
92 static DEFINE_SPINLOCK(zpci_iomap_lock);
93 static DECLARE_BITMAP(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
94 struct zpci_iomap_entry *zpci_iomap_start;
95 EXPORT_SYMBOL_GPL(zpci_iomap_start);
96
97 /* highest irq summary bit */
98 static int __read_mostly aisb_max;
99
100 static struct kmem_cache *zdev_irq_cache;
101 static struct kmem_cache *zdev_fmb_cache;
102
103 debug_info_t *pci_debug_msg_id;
104 debug_info_t *pci_debug_err_id;
105
106 static inline int irq_to_msi_nr(unsigned int irq)
107 {
108 return irq & ZPCI_MSI_MASK;
109 }
110
111 static inline int irq_to_dev_nr(unsigned int irq)
112 {
113 return irq >> ZPCI_MSI_VEC_BITS;
114 }
115
116 static inline struct zdev_irq_map *get_imap(unsigned int irq)
117 {
118 return bucket->imap[irq_to_dev_nr(irq)];
119 }
120
121 struct zpci_dev *get_zdev(struct pci_dev *pdev)
122 {
123 return (struct zpci_dev *) pdev->sysdata;
124 }
125
126 struct zpci_dev *get_zdev_by_fid(u32 fid)
127 {
128 struct zpci_dev *tmp, *zdev = NULL;
129
130 mutex_lock(&zpci_list_lock);
131 list_for_each_entry(tmp, &zpci_list, entry) {
132 if (tmp->fid == fid) {
133 zdev = tmp;
134 break;
135 }
136 }
137 mutex_unlock(&zpci_list_lock);
138 return zdev;
139 }
140
141 bool zpci_fid_present(u32 fid)
142 {
143 return (get_zdev_by_fid(fid) != NULL) ? true : false;
144 }
145
146 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
147 {
148 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
149 }
150
151 int pci_domain_nr(struct pci_bus *bus)
152 {
153 return ((struct zpci_dev *) bus->sysdata)->domain;
154 }
155 EXPORT_SYMBOL_GPL(pci_domain_nr);
156
157 int pci_proc_domain(struct pci_bus *bus)
158 {
159 return pci_domain_nr(bus);
160 }
161 EXPORT_SYMBOL_GPL(pci_proc_domain);
162
163 /* Modify PCI: Register adapter interruptions */
164 static int zpci_register_airq(struct zpci_dev *zdev, unsigned int aisb,
165 u64 aibv)
166 {
167 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
168 struct zpci_fib *fib;
169 int rc;
170
171 fib = (void *) get_zeroed_page(GFP_KERNEL);
172 if (!fib)
173 return -ENOMEM;
174
175 fib->isc = PCI_ISC;
176 fib->noi = zdev->irq_map->msi_vecs;
177 fib->sum = 1; /* enable summary notifications */
178 fib->aibv = aibv;
179 fib->aibvo = 0; /* every function has its own page */
180 fib->aisb = (u64) bucket->aisb + aisb / 8;
181 fib->aisbo = aisb & ZPCI_MSI_MASK;
182
183 rc = mpcifc_instr(req, fib);
184 pr_debug("%s mpcifc returned noi: %d\n", __func__, fib->noi);
185
186 free_page((unsigned long) fib);
187 return rc;
188 }
189
190 struct mod_pci_args {
191 u64 base;
192 u64 limit;
193 u64 iota;
194 u64 fmb_addr;
195 };
196
197 static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
198 {
199 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
200 struct zpci_fib *fib;
201 int rc;
202
203 /* The FIB must be available even if it's not used */
204 fib = (void *) get_zeroed_page(GFP_KERNEL);
205 if (!fib)
206 return -ENOMEM;
207
208 fib->pba = args->base;
209 fib->pal = args->limit;
210 fib->iota = args->iota;
211 fib->fmb_addr = args->fmb_addr;
212
213 rc = mpcifc_instr(req, fib);
214 free_page((unsigned long) fib);
215 return rc;
216 }
217
218 /* Modify PCI: Register I/O address translation parameters */
219 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
220 u64 base, u64 limit, u64 iota)
221 {
222 struct mod_pci_args args = { base, limit, iota, 0 };
223
224 WARN_ON_ONCE(iota & 0x3fff);
225 args.iota |= ZPCI_IOTA_RTTO_FLAG;
226 return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
227 }
228
229 /* Modify PCI: Unregister I/O address translation parameters */
230 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
231 {
232 struct mod_pci_args args = { 0, 0, 0, 0 };
233
234 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
235 }
236
237 /* Modify PCI: Unregister adapter interruptions */
238 static int zpci_unregister_airq(struct zpci_dev *zdev)
239 {
240 struct mod_pci_args args = { 0, 0, 0, 0 };
241
242 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
243 }
244
245 /* Modify PCI: Set PCI function measurement parameters */
246 int zpci_fmb_enable_device(struct zpci_dev *zdev)
247 {
248 struct mod_pci_args args = { 0, 0, 0, 0 };
249
250 if (zdev->fmb)
251 return -EINVAL;
252
253 zdev->fmb = kmem_cache_alloc(zdev_fmb_cache, GFP_KERNEL);
254 if (!zdev->fmb)
255 return -ENOMEM;
256 memset(zdev->fmb, 0, sizeof(*zdev->fmb));
257 WARN_ON((u64) zdev->fmb & 0xf);
258
259 args.fmb_addr = virt_to_phys(zdev->fmb);
260 return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
261 }
262
263 /* Modify PCI: Disable PCI function measurement */
264 int zpci_fmb_disable_device(struct zpci_dev *zdev)
265 {
266 struct mod_pci_args args = { 0, 0, 0, 0 };
267 int rc;
268
269 if (!zdev->fmb)
270 return -EINVAL;
271
272 /* Function measurement is disabled if fmb address is zero */
273 rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
274
275 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
276 zdev->fmb = NULL;
277 return rc;
278 }
279
280 #define ZPCI_PCIAS_CFGSPC 15
281
282 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
283 {
284 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
285 u64 data;
286 int rc;
287
288 rc = pcilg_instr(&data, req, offset);
289 data = data << ((8 - len) * 8);
290 data = le64_to_cpu(data);
291 if (!rc)
292 *val = (u32) data;
293 else
294 *val = 0xffffffff;
295 return rc;
296 }
297
298 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
299 {
300 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
301 u64 data = val;
302 int rc;
303
304 data = cpu_to_le64(data);
305 data = data >> ((8 - len) * 8);
306 rc = pcistg_instr(data, req, offset);
307 return rc;
308 }
309
310 void synchronize_irq(unsigned int irq)
311 {
312 /*
313 * Not needed, the handler is protected by a lock and IRQs that occur
314 * after the handler is deleted are just NOPs.
315 */
316 }
317 EXPORT_SYMBOL_GPL(synchronize_irq);
318
319 void enable_irq(unsigned int irq)
320 {
321 struct msi_desc *msi = irq_get_msi_desc(irq);
322
323 zpci_msi_set_mask_bits(msi, 1, 0);
324 }
325 EXPORT_SYMBOL_GPL(enable_irq);
326
327 void disable_irq(unsigned int irq)
328 {
329 struct msi_desc *msi = irq_get_msi_desc(irq);
330
331 zpci_msi_set_mask_bits(msi, 1, 1);
332 }
333 EXPORT_SYMBOL_GPL(disable_irq);
334
335 void disable_irq_nosync(unsigned int irq)
336 {
337 disable_irq(irq);
338 }
339 EXPORT_SYMBOL_GPL(disable_irq_nosync);
340
341 unsigned long probe_irq_on(void)
342 {
343 return 0;
344 }
345 EXPORT_SYMBOL_GPL(probe_irq_on);
346
347 int probe_irq_off(unsigned long val)
348 {
349 return 0;
350 }
351 EXPORT_SYMBOL_GPL(probe_irq_off);
352
353 unsigned int probe_irq_mask(unsigned long val)
354 {
355 return val;
356 }
357 EXPORT_SYMBOL_GPL(probe_irq_mask);
358
359 void pcibios_fixup_bus(struct pci_bus *bus)
360 {
361 }
362
363 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
364 resource_size_t size,
365 resource_size_t align)
366 {
367 return 0;
368 }
369
370 /* combine single writes by using store-block insn */
371 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
372 {
373 zpci_memcpy_toio(to, from, count);
374 }
375
376 /* Create a virtual mapping cookie for a PCI BAR */
377 void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max)
378 {
379 struct zpci_dev *zdev = get_zdev(pdev);
380 u64 addr;
381 int idx;
382
383 if ((bar & 7) != bar)
384 return NULL;
385
386 idx = zdev->bars[bar].map_idx;
387 spin_lock(&zpci_iomap_lock);
388 zpci_iomap_start[idx].fh = zdev->fh;
389 zpci_iomap_start[idx].bar = bar;
390 spin_unlock(&zpci_iomap_lock);
391
392 addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48);
393 return (void __iomem *) addr;
394 }
395 EXPORT_SYMBOL_GPL(pci_iomap);
396
397 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
398 {
399 unsigned int idx;
400
401 idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48;
402 spin_lock(&zpci_iomap_lock);
403 zpci_iomap_start[idx].fh = 0;
404 zpci_iomap_start[idx].bar = 0;
405 spin_unlock(&zpci_iomap_lock);
406 }
407 EXPORT_SYMBOL_GPL(pci_iounmap);
408
409 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
410 int size, u32 *val)
411 {
412 struct zpci_dev *zdev = get_zdev_by_bus(bus);
413
414 if (!zdev || devfn != ZPCI_DEVFN)
415 return 0;
416 return zpci_cfg_load(zdev, where, val, size);
417 }
418
419 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
420 int size, u32 val)
421 {
422 struct zpci_dev *zdev = get_zdev_by_bus(bus);
423
424 if (!zdev || devfn != ZPCI_DEVFN)
425 return 0;
426 return zpci_cfg_store(zdev, where, val, size);
427 }
428
429 static struct pci_ops pci_root_ops = {
430 .read = pci_read,
431 .write = pci_write,
432 };
433
434 /* store the last handled bit to implement fair scheduling of devices */
435 static DEFINE_PER_CPU(unsigned long, next_sbit);
436
437 static void zpci_irq_handler(void *dont, void *need)
438 {
439 unsigned long sbit, mbit, last = 0, start = __get_cpu_var(next_sbit);
440 int rescan = 0, max = aisb_max;
441 struct zdev_irq_map *imap;
442
443 inc_irq_stat(IRQIO_PCI);
444 sbit = start;
445
446 scan:
447 /* find summary_bit */
448 for_each_set_bit_left_cont(sbit, bucket->aisb, max) {
449 clear_bit(63 - (sbit & 63), bucket->aisb + (sbit >> 6));
450 last = sbit;
451
452 /* find vector bit */
453 imap = bucket->imap[sbit];
454 for_each_set_bit_left(mbit, &imap->aibv, imap->msi_vecs) {
455 inc_irq_stat(IRQIO_MSI);
456 clear_bit(63 - mbit, &imap->aibv);
457
458 spin_lock(&imap->lock);
459 if (imap->cb[mbit].handler)
460 imap->cb[mbit].handler(mbit,
461 imap->cb[mbit].data);
462 spin_unlock(&imap->lock);
463 }
464 }
465
466 if (rescan)
467 goto out;
468
469 /* scan the skipped bits */
470 if (start > 0) {
471 sbit = 0;
472 max = start;
473 start = 0;
474 goto scan;
475 }
476
477 /* enable interrupts again */
478 sic_instr(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
479
480 /* check again to not lose initiative */
481 rmb();
482 max = aisb_max;
483 sbit = find_first_bit_left(bucket->aisb, max);
484 if (sbit != max) {
485 atomic_inc(&irq_retries);
486 rescan++;
487 goto scan;
488 }
489 out:
490 /* store next device bit to scan */
491 __get_cpu_var(next_sbit) = (++last >= aisb_max) ? 0 : last;
492 }
493
494 /* msi_vecs - number of requested interrupts, 0 place function to error state */
495 static int zpci_setup_msi(struct pci_dev *pdev, int msi_vecs)
496 {
497 struct zpci_dev *zdev = get_zdev(pdev);
498 unsigned int aisb, msi_nr;
499 struct msi_desc *msi;
500 int rc;
501
502 /* store the number of used MSI vectors */
503 zdev->irq_map->msi_vecs = min(msi_vecs, ZPCI_NR_MSI_VECS);
504
505 spin_lock(&bucket->lock);
506 aisb = find_first_zero_bit(bucket->alloc, PAGE_SIZE);
507 /* alloc map exhausted? */
508 if (aisb == PAGE_SIZE) {
509 spin_unlock(&bucket->lock);
510 return -EIO;
511 }
512 set_bit(aisb, bucket->alloc);
513 spin_unlock(&bucket->lock);
514
515 zdev->aisb = aisb;
516 if (aisb + 1 > aisb_max)
517 aisb_max = aisb + 1;
518
519 /* wire up IRQ shortcut pointer */
520 bucket->imap[zdev->aisb] = zdev->irq_map;
521 pr_debug("%s: imap[%u] linked to %p\n", __func__, zdev->aisb, zdev->irq_map);
522
523 /* TODO: irq number 0 wont be found if we return less than requested MSIs.
524 * ignore it for now and fix in common code.
525 */
526 msi_nr = aisb << ZPCI_MSI_VEC_BITS;
527
528 list_for_each_entry(msi, &pdev->msi_list, list) {
529 rc = zpci_setup_msi_irq(zdev, msi, msi_nr,
530 aisb << ZPCI_MSI_VEC_BITS);
531 if (rc)
532 return rc;
533 msi_nr++;
534 }
535
536 rc = zpci_register_airq(zdev, aisb, (u64) &zdev->irq_map->aibv);
537 if (rc) {
538 clear_bit(aisb, bucket->alloc);
539 dev_err(&pdev->dev, "register MSI failed with: %d\n", rc);
540 return rc;
541 }
542 return (zdev->irq_map->msi_vecs == msi_vecs) ?
543 0 : zdev->irq_map->msi_vecs;
544 }
545
546 static void zpci_teardown_msi(struct pci_dev *pdev)
547 {
548 struct zpci_dev *zdev = get_zdev(pdev);
549 struct msi_desc *msi;
550 int aisb, rc;
551
552 rc = zpci_unregister_airq(zdev);
553 if (rc) {
554 dev_err(&pdev->dev, "deregister MSI failed with: %d\n", rc);
555 return;
556 }
557
558 msi = list_first_entry(&pdev->msi_list, struct msi_desc, list);
559 aisb = irq_to_dev_nr(msi->irq);
560
561 list_for_each_entry(msi, &pdev->msi_list, list)
562 zpci_teardown_msi_irq(zdev, msi);
563
564 clear_bit(aisb, bucket->alloc);
565 if (aisb + 1 == aisb_max)
566 aisb_max--;
567 }
568
569 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
570 {
571 pr_debug("%s: requesting %d MSI-X interrupts...", __func__, nvec);
572 if (type != PCI_CAP_ID_MSIX && type != PCI_CAP_ID_MSI)
573 return -EINVAL;
574 return zpci_setup_msi(pdev, nvec);
575 }
576
577 void arch_teardown_msi_irqs(struct pci_dev *pdev)
578 {
579 pr_info("%s: on pdev: %p\n", __func__, pdev);
580 zpci_teardown_msi(pdev);
581 }
582
583 static void zpci_map_resources(struct zpci_dev *zdev)
584 {
585 struct pci_dev *pdev = zdev->pdev;
586 resource_size_t len;
587 int i;
588
589 for (i = 0; i < PCI_BAR_COUNT; i++) {
590 len = pci_resource_len(pdev, i);
591 if (!len)
592 continue;
593 pdev->resource[i].start = (resource_size_t) pci_iomap(pdev, i, 0);
594 pdev->resource[i].end = pdev->resource[i].start + len - 1;
595 pr_debug("BAR%i: -> start: %Lx end: %Lx\n",
596 i, pdev->resource[i].start, pdev->resource[i].end);
597 }
598 };
599
600 static void zpci_unmap_resources(struct pci_dev *pdev)
601 {
602 resource_size_t len;
603 int i;
604
605 for (i = 0; i < PCI_BAR_COUNT; i++) {
606 len = pci_resource_len(pdev, i);
607 if (!len)
608 continue;
609 pci_iounmap(pdev, (void *) pdev->resource[i].start);
610 }
611 };
612
613 struct zpci_dev *zpci_alloc_device(void)
614 {
615 struct zpci_dev *zdev;
616
617 /* Alloc memory for our private pci device data */
618 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
619 if (!zdev)
620 return ERR_PTR(-ENOMEM);
621
622 /* Alloc aibv & callback space */
623 zdev->irq_map = kmem_cache_zalloc(zdev_irq_cache, GFP_KERNEL);
624 if (!zdev->irq_map)
625 goto error;
626 WARN_ON((u64) zdev->irq_map & 0xff);
627 return zdev;
628
629 error:
630 kfree(zdev);
631 return ERR_PTR(-ENOMEM);
632 }
633
634 void zpci_free_device(struct zpci_dev *zdev)
635 {
636 kmem_cache_free(zdev_irq_cache, zdev->irq_map);
637 kfree(zdev);
638 }
639
640 /* Called on removal of pci_dev, leaves zpci and bus device */
641 static void zpci_remove_device(struct pci_dev *pdev)
642 {
643 struct zpci_dev *zdev = get_zdev(pdev);
644
645 dev_info(&pdev->dev, "Removing device %u\n", zdev->domain);
646 zdev->state = ZPCI_FN_STATE_CONFIGURED;
647 zpci_dma_exit_device(zdev);
648 zpci_fmb_disable_device(zdev);
649 zpci_sysfs_remove_device(&pdev->dev);
650 zpci_unmap_resources(pdev);
651 list_del(&zdev->entry); /* can be called from init */
652 zdev->pdev = NULL;
653 }
654
655 static void zpci_scan_devices(void)
656 {
657 struct zpci_dev *zdev;
658
659 mutex_lock(&zpci_list_lock);
660 list_for_each_entry(zdev, &zpci_list, entry)
661 if (zdev->state == ZPCI_FN_STATE_CONFIGURED)
662 zpci_scan_device(zdev);
663 mutex_unlock(&zpci_list_lock);
664 }
665
666 /*
667 * Too late for any s390 specific setup, since interrupts must be set up
668 * already which requires DMA setup too and the pci scan will access the
669 * config space, which only works if the function handle is enabled.
670 */
671 int pcibios_enable_device(struct pci_dev *pdev, int mask)
672 {
673 struct resource *res;
674 u16 cmd;
675 int i;
676
677 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
678
679 for (i = 0; i < PCI_BAR_COUNT; i++) {
680 res = &pdev->resource[i];
681
682 if (res->flags & IORESOURCE_IO)
683 return -EINVAL;
684
685 if (res->flags & IORESOURCE_MEM)
686 cmd |= PCI_COMMAND_MEMORY;
687 }
688 pci_write_config_word(pdev, PCI_COMMAND, cmd);
689 return 0;
690 }
691
692 void pcibios_disable_device(struct pci_dev *pdev)
693 {
694 zpci_remove_device(pdev);
695 pdev->sysdata = NULL;
696 }
697
698 int pcibios_add_platform_entries(struct pci_dev *pdev)
699 {
700 return zpci_sysfs_add_device(&pdev->dev);
701 }
702
703 int zpci_request_irq(unsigned int irq, irq_handler_t handler, void *data)
704 {
705 int msi_nr = irq_to_msi_nr(irq);
706 struct zdev_irq_map *imap;
707 struct msi_desc *msi;
708
709 msi = irq_get_msi_desc(irq);
710 if (!msi)
711 return -EIO;
712
713 imap = get_imap(irq);
714 spin_lock_init(&imap->lock);
715
716 pr_debug("%s: register handler for IRQ:MSI %d:%d\n", __func__, irq >> 6, msi_nr);
717 imap->cb[msi_nr].handler = handler;
718 imap->cb[msi_nr].data = data;
719
720 /*
721 * The generic MSI code returns with the interrupt disabled on the
722 * card, using the MSI mask bits. Firmware doesn't appear to unmask
723 * at that level, so we do it here by hand.
724 */
725 zpci_msi_set_mask_bits(msi, 1, 0);
726 return 0;
727 }
728
729 void zpci_free_irq(unsigned int irq)
730 {
731 struct zdev_irq_map *imap = get_imap(irq);
732 int msi_nr = irq_to_msi_nr(irq);
733 unsigned long flags;
734
735 pr_debug("%s: for irq: %d\n", __func__, irq);
736
737 spin_lock_irqsave(&imap->lock, flags);
738 imap->cb[msi_nr].handler = NULL;
739 imap->cb[msi_nr].data = NULL;
740 spin_unlock_irqrestore(&imap->lock, flags);
741 }
742
743 int request_irq(unsigned int irq, irq_handler_t handler,
744 unsigned long irqflags, const char *devname, void *dev_id)
745 {
746 pr_debug("%s: irq: %d handler: %p flags: %lx dev: %s\n",
747 __func__, irq, handler, irqflags, devname);
748
749 return zpci_request_irq(irq, handler, dev_id);
750 }
751 EXPORT_SYMBOL_GPL(request_irq);
752
753 void free_irq(unsigned int irq, void *dev_id)
754 {
755 zpci_free_irq(irq);
756 }
757 EXPORT_SYMBOL_GPL(free_irq);
758
759 static int __init zpci_irq_init(void)
760 {
761 int cpu, rc;
762
763 bucket = kzalloc(sizeof(*bucket), GFP_KERNEL);
764 if (!bucket)
765 return -ENOMEM;
766
767 bucket->aisb = (unsigned long *) get_zeroed_page(GFP_KERNEL);
768 if (!bucket->aisb) {
769 rc = -ENOMEM;
770 goto out_aisb;
771 }
772
773 bucket->alloc = (unsigned long *) get_zeroed_page(GFP_KERNEL);
774 if (!bucket->alloc) {
775 rc = -ENOMEM;
776 goto out_alloc;
777 }
778
779 isc_register(PCI_ISC);
780 zpci_irq_si = s390_register_adapter_interrupt(&zpci_irq_handler, NULL, PCI_ISC);
781 if (IS_ERR(zpci_irq_si)) {
782 rc = PTR_ERR(zpci_irq_si);
783 zpci_irq_si = NULL;
784 goto out_ai;
785 }
786
787 for_each_online_cpu(cpu)
788 per_cpu(next_sbit, cpu) = 0;
789
790 spin_lock_init(&bucket->lock);
791 /* set summary to 1 to be called every time for the ISC */
792 *zpci_irq_si = 1;
793 sic_instr(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
794 return 0;
795
796 out_ai:
797 isc_unregister(PCI_ISC);
798 free_page((unsigned long) bucket->alloc);
799 out_alloc:
800 free_page((unsigned long) bucket->aisb);
801 out_aisb:
802 kfree(bucket);
803 return rc;
804 }
805
806 static void zpci_irq_exit(void)
807 {
808 free_page((unsigned long) bucket->alloc);
809 free_page((unsigned long) bucket->aisb);
810 s390_unregister_adapter_interrupt(zpci_irq_si, PCI_ISC);
811 isc_unregister(PCI_ISC);
812 kfree(bucket);
813 }
814
815 void zpci_debug_info(struct zpci_dev *zdev, struct seq_file *m)
816 {
817 if (!zdev)
818 return;
819
820 seq_printf(m, "global irq retries: %u\n", atomic_read(&irq_retries));
821 seq_printf(m, "aibv[0]:%016lx aibv[1]:%016lx aisb:%016lx\n",
822 get_imap(0)->aibv, get_imap(1)->aibv, *bucket->aisb);
823 }
824
825 static struct resource *zpci_alloc_bus_resource(unsigned long start, unsigned long size,
826 unsigned long flags, int domain)
827 {
828 struct resource *r;
829 char *name;
830 int rc;
831
832 r = kzalloc(sizeof(*r), GFP_KERNEL);
833 if (!r)
834 return ERR_PTR(-ENOMEM);
835 r->start = start;
836 r->end = r->start + size - 1;
837 r->flags = flags;
838 r->parent = &iomem_resource;
839 name = kmalloc(18, GFP_KERNEL);
840 if (!name) {
841 kfree(r);
842 return ERR_PTR(-ENOMEM);
843 }
844 sprintf(name, "PCI Bus: %04x:%02x", domain, ZPCI_BUS_NR);
845 r->name = name;
846
847 rc = request_resource(&iomem_resource, r);
848 if (rc)
849 pr_debug("request resource %pR failed\n", r);
850 return r;
851 }
852
853 static int zpci_alloc_iomap(struct zpci_dev *zdev)
854 {
855 int entry;
856
857 spin_lock(&zpci_iomap_lock);
858 entry = find_first_zero_bit(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
859 if (entry == ZPCI_IOMAP_MAX_ENTRIES) {
860 spin_unlock(&zpci_iomap_lock);
861 return -ENOSPC;
862 }
863 set_bit(entry, zpci_iomap);
864 spin_unlock(&zpci_iomap_lock);
865 return entry;
866 }
867
868 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
869 {
870 spin_lock(&zpci_iomap_lock);
871 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
872 clear_bit(entry, zpci_iomap);
873 spin_unlock(&zpci_iomap_lock);
874 }
875
876 static int zpci_create_device_bus(struct zpci_dev *zdev)
877 {
878 struct resource *res;
879 LIST_HEAD(resources);
880 int i;
881
882 /* allocate mapping entry for each used bar */
883 for (i = 0; i < PCI_BAR_COUNT; i++) {
884 unsigned long addr, size, flags;
885 int entry;
886
887 if (!zdev->bars[i].size)
888 continue;
889 entry = zpci_alloc_iomap(zdev);
890 if (entry < 0)
891 return entry;
892 zdev->bars[i].map_idx = entry;
893
894 /* only MMIO is supported */
895 flags = IORESOURCE_MEM;
896 if (zdev->bars[i].val & 8)
897 flags |= IORESOURCE_PREFETCH;
898 if (zdev->bars[i].val & 4)
899 flags |= IORESOURCE_MEM_64;
900
901 addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48);
902
903 size = 1UL << zdev->bars[i].size;
904
905 res = zpci_alloc_bus_resource(addr, size, flags, zdev->domain);
906 if (IS_ERR(res)) {
907 zpci_free_iomap(zdev, entry);
908 return PTR_ERR(res);
909 }
910 pci_add_resource(&resources, res);
911 }
912
913 zdev->bus = pci_create_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
914 zdev, &resources);
915 if (!zdev->bus)
916 return -EIO;
917
918 zdev->bus->max_bus_speed = zdev->max_bus_speed;
919 return 0;
920 }
921
922 static int zpci_alloc_domain(struct zpci_dev *zdev)
923 {
924 spin_lock(&zpci_domain_lock);
925 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
926 if (zdev->domain == ZPCI_NR_DEVICES) {
927 spin_unlock(&zpci_domain_lock);
928 return -ENOSPC;
929 }
930 set_bit(zdev->domain, zpci_domain);
931 spin_unlock(&zpci_domain_lock);
932 return 0;
933 }
934
935 static void zpci_free_domain(struct zpci_dev *zdev)
936 {
937 spin_lock(&zpci_domain_lock);
938 clear_bit(zdev->domain, zpci_domain);
939 spin_unlock(&zpci_domain_lock);
940 }
941
942 int zpci_enable_device(struct zpci_dev *zdev)
943 {
944 int rc;
945
946 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
947 if (rc)
948 goto out;
949 pr_info("Enabled fh: 0x%x fid: 0x%x\n", zdev->fh, zdev->fid);
950
951 rc = zpci_dma_init_device(zdev);
952 if (rc)
953 goto out_dma;
954 return 0;
955
956 out_dma:
957 clp_disable_fh(zdev);
958 out:
959 return rc;
960 }
961 EXPORT_SYMBOL_GPL(zpci_enable_device);
962
963 int zpci_create_device(struct zpci_dev *zdev)
964 {
965 int rc;
966
967 rc = zpci_alloc_domain(zdev);
968 if (rc)
969 goto out;
970
971 rc = zpci_create_device_bus(zdev);
972 if (rc)
973 goto out_bus;
974
975 mutex_lock(&zpci_list_lock);
976 list_add_tail(&zdev->entry, &zpci_list);
977 if (hotplug_ops.create_slot)
978 hotplug_ops.create_slot(zdev);
979 mutex_unlock(&zpci_list_lock);
980
981 if (zdev->state == ZPCI_FN_STATE_STANDBY)
982 return 0;
983
984 rc = zpci_enable_device(zdev);
985 if (rc)
986 goto out_start;
987 return 0;
988
989 out_start:
990 mutex_lock(&zpci_list_lock);
991 list_del(&zdev->entry);
992 if (hotplug_ops.remove_slot)
993 hotplug_ops.remove_slot(zdev);
994 mutex_unlock(&zpci_list_lock);
995 out_bus:
996 zpci_free_domain(zdev);
997 out:
998 return rc;
999 }
1000
1001 void zpci_stop_device(struct zpci_dev *zdev)
1002 {
1003 zpci_dma_exit_device(zdev);
1004 /*
1005 * Note: SCLP disables fh via set-pci-fn so don't
1006 * do that here.
1007 */
1008 }
1009 EXPORT_SYMBOL_GPL(zpci_stop_device);
1010
1011 int zpci_scan_device(struct zpci_dev *zdev)
1012 {
1013 zdev->pdev = pci_scan_single_device(zdev->bus, ZPCI_DEVFN);
1014 if (!zdev->pdev) {
1015 pr_err("pci_scan_single_device failed for fid: 0x%x\n",
1016 zdev->fid);
1017 goto out;
1018 }
1019
1020 zpci_debug_init_device(zdev);
1021 zpci_fmb_enable_device(zdev);
1022 zpci_map_resources(zdev);
1023 pci_bus_add_devices(zdev->bus);
1024
1025 /* now that pdev was added to the bus mark it as used */
1026 zdev->state = ZPCI_FN_STATE_ONLINE;
1027 return 0;
1028
1029 out:
1030 zpci_dma_exit_device(zdev);
1031 clp_disable_fh(zdev);
1032 return -EIO;
1033 }
1034 EXPORT_SYMBOL_GPL(zpci_scan_device);
1035
1036 static inline int barsize(u8 size)
1037 {
1038 return (size) ? (1 << size) >> 10 : 0;
1039 }
1040
1041 static int zpci_mem_init(void)
1042 {
1043 zdev_irq_cache = kmem_cache_create("PCI_IRQ_cache", sizeof(struct zdev_irq_map),
1044 L1_CACHE_BYTES, SLAB_HWCACHE_ALIGN, NULL);
1045 if (!zdev_irq_cache)
1046 goto error_zdev;
1047
1048 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
1049 16, 0, NULL);
1050 if (!zdev_fmb_cache)
1051 goto error_fmb;
1052
1053 /* TODO: use realloc */
1054 zpci_iomap_start = kzalloc(ZPCI_IOMAP_MAX_ENTRIES * sizeof(*zpci_iomap_start),
1055 GFP_KERNEL);
1056 if (!zpci_iomap_start)
1057 goto error_iomap;
1058 return 0;
1059
1060 error_iomap:
1061 kmem_cache_destroy(zdev_fmb_cache);
1062 error_fmb:
1063 kmem_cache_destroy(zdev_irq_cache);
1064 error_zdev:
1065 return -ENOMEM;
1066 }
1067
1068 static void zpci_mem_exit(void)
1069 {
1070 kfree(zpci_iomap_start);
1071 kmem_cache_destroy(zdev_irq_cache);
1072 kmem_cache_destroy(zdev_fmb_cache);
1073 }
1074
1075 unsigned int pci_probe = 1;
1076 EXPORT_SYMBOL_GPL(pci_probe);
1077
1078 char * __init pcibios_setup(char *str)
1079 {
1080 if (!strcmp(str, "off")) {
1081 pci_probe = 0;
1082 return NULL;
1083 }
1084 return str;
1085 }
1086
1087 static int __init pci_base_init(void)
1088 {
1089 int rc;
1090
1091 if (!pci_probe)
1092 return 0;
1093
1094 if (!test_facility(2) || !test_facility(69)
1095 || !test_facility(71) || !test_facility(72))
1096 return 0;
1097
1098 pr_info("Probing PCI hardware: PCI:%d SID:%d AEN:%d\n",
1099 test_facility(69), test_facility(70),
1100 test_facility(71));
1101
1102 rc = zpci_debug_init();
1103 if (rc)
1104 return rc;
1105
1106 rc = zpci_mem_init();
1107 if (rc)
1108 goto out_mem;
1109
1110 rc = zpci_msihash_init();
1111 if (rc)
1112 goto out_hash;
1113
1114 rc = zpci_irq_init();
1115 if (rc)
1116 goto out_irq;
1117
1118 rc = zpci_dma_init();
1119 if (rc)
1120 goto out_dma;
1121
1122 rc = clp_find_pci_devices();
1123 if (rc)
1124 goto out_find;
1125
1126 zpci_scan_devices();
1127 return 0;
1128
1129 out_find:
1130 zpci_dma_exit();
1131 out_dma:
1132 zpci_irq_exit();
1133 out_irq:
1134 zpci_msihash_exit();
1135 out_hash:
1136 zpci_mem_exit();
1137 out_mem:
1138 zpci_debug_exit();
1139 return rc;
1140 }
1141 subsys_initcall(pci_base_init);
kernel source for telekom puls (alcatel/mediatek)