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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / arch / s390 / pci / pci.c
blobf17a8343e3609d7d644b1d5896fd49bf4fca9e88
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_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
46
47 /* list of all detected zpci devices */
48 static LIST_HEAD(zpci_list);
49 static DEFINE_SPINLOCK(zpci_list_lock);
50
51 static void zpci_enable_irq(struct irq_data *data);
52 static void zpci_disable_irq(struct irq_data *data);
53
54 static struct irq_chip zpci_irq_chip = {
55 .name = "zPCI",
56 .irq_unmask = zpci_enable_irq,
57 .irq_mask = zpci_disable_irq,
58 };
59
60 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
61 static DEFINE_SPINLOCK(zpci_domain_lock);
62
63 static struct airq_iv *zpci_aisb_iv;
64 static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
65
66 /* Adapter interrupt definitions */
67 static void zpci_irq_handler(struct airq_struct *airq);
68
69 static struct airq_struct zpci_airq = {
70 .handler = zpci_irq_handler,
71 .isc = PCI_ISC,
72 };
73
74 /* I/O Map */
75 static DEFINE_SPINLOCK(zpci_iomap_lock);
76 static DECLARE_BITMAP(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
77 struct zpci_iomap_entry *zpci_iomap_start;
78 EXPORT_SYMBOL_GPL(zpci_iomap_start);
79
80 static struct kmem_cache *zdev_fmb_cache;
81
82 struct zpci_dev *get_zdev(struct pci_dev *pdev)
83 {
84 return (struct zpci_dev *) pdev->sysdata;
85 }
86
87 struct zpci_dev *get_zdev_by_fid(u32 fid)
88 {
89 struct zpci_dev *tmp, *zdev = NULL;
90
91 spin_lock(&zpci_list_lock);
92 list_for_each_entry(tmp, &zpci_list, entry) {
93 if (tmp->fid == fid) {
94 zdev = tmp;
95 break;
96 }
97 }
98 spin_unlock(&zpci_list_lock);
99 return zdev;
100 }
101
102 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
103 {
104 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
105 }
106
107 int pci_domain_nr(struct pci_bus *bus)
108 {
109 return ((struct zpci_dev *) bus->sysdata)->domain;
110 }
111 EXPORT_SYMBOL_GPL(pci_domain_nr);
112
113 int pci_proc_domain(struct pci_bus *bus)
114 {
115 return pci_domain_nr(bus);
116 }
117 EXPORT_SYMBOL_GPL(pci_proc_domain);
118
119 /* Modify PCI: Register adapter interruptions */
120 static int zpci_set_airq(struct zpci_dev *zdev)
121 {
122 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
123 struct zpci_fib *fib;
124 int rc;
125
126 fib = (void *) get_zeroed_page(GFP_KERNEL);
127 if (!fib)
128 return -ENOMEM;
129
130 fib->isc = PCI_ISC;
131 fib->sum = 1; /* enable summary notifications */
132 fib->noi = airq_iv_end(zdev->aibv);
133 fib->aibv = (unsigned long) zdev->aibv->vector;
134 fib->aibvo = 0; /* each zdev has its own interrupt vector */
135 fib->aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
136 fib->aisbo = zdev->aisb & 63;
137
138 rc = zpci_mod_fc(req, fib);
139 pr_debug("%s mpcifc returned noi: %d\n", __func__, fib->noi);
140
141 free_page((unsigned long) fib);
142 return rc;
143 }
144
145 struct mod_pci_args {
146 u64 base;
147 u64 limit;
148 u64 iota;
149 u64 fmb_addr;
150 };
151
152 static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
153 {
154 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
155 struct zpci_fib *fib;
156 int rc;
157
158 /* The FIB must be available even if it's not used */
159 fib = (void *) get_zeroed_page(GFP_KERNEL);
160 if (!fib)
161 return -ENOMEM;
162
163 fib->pba = args->base;
164 fib->pal = args->limit;
165 fib->iota = args->iota;
166 fib->fmb_addr = args->fmb_addr;
167
168 rc = zpci_mod_fc(req, fib);
169 free_page((unsigned long) fib);
170 return rc;
171 }
172
173 /* Modify PCI: Register I/O address translation parameters */
174 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
175 u64 base, u64 limit, u64 iota)
176 {
177 struct mod_pci_args args = { base, limit, iota, 0 };
178
179 WARN_ON_ONCE(iota & 0x3fff);
180 args.iota |= ZPCI_IOTA_RTTO_FLAG;
181 return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
182 }
183
184 /* Modify PCI: Unregister I/O address translation parameters */
185 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
186 {
187 struct mod_pci_args args = { 0, 0, 0, 0 };
188
189 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
190 }
191
192 /* Modify PCI: Unregister adapter interruptions */
193 static int zpci_clear_airq(struct zpci_dev *zdev)
194 {
195 struct mod_pci_args args = { 0, 0, 0, 0 };
196
197 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
198 }
199
200 /* Modify PCI: Set PCI function measurement parameters */
201 int zpci_fmb_enable_device(struct zpci_dev *zdev)
202 {
203 struct mod_pci_args args = { 0, 0, 0, 0 };
204
205 if (zdev->fmb)
206 return -EINVAL;
207
208 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
209 if (!zdev->fmb)
210 return -ENOMEM;
211 WARN_ON((u64) zdev->fmb & 0xf);
212
213 args.fmb_addr = virt_to_phys(zdev->fmb);
214 return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
215 }
216
217 /* Modify PCI: Disable PCI function measurement */
218 int zpci_fmb_disable_device(struct zpci_dev *zdev)
219 {
220 struct mod_pci_args args = { 0, 0, 0, 0 };
221 int rc;
222
223 if (!zdev->fmb)
224 return -EINVAL;
225
226 /* Function measurement is disabled if fmb address is zero */
227 rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
228
229 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
230 zdev->fmb = NULL;
231 return rc;
232 }
233
234 #define ZPCI_PCIAS_CFGSPC 15
235
236 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
237 {
238 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
239 u64 data;
240 int rc;
241
242 rc = zpci_load(&data, req, offset);
243 if (!rc) {
244 data = data << ((8 - len) * 8);
245 data = le64_to_cpu(data);
246 *val = (u32) data;
247 } else
248 *val = 0xffffffff;
249 return rc;
250 }
251
252 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
253 {
254 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
255 u64 data = val;
256 int rc;
257
258 data = cpu_to_le64(data);
259 data = data >> ((8 - len) * 8);
260 rc = zpci_store(data, req, offset);
261 return rc;
262 }
263
264 static int zpci_msi_set_mask_bits(struct msi_desc *msi, u32 mask, u32 flag)
265 {
266 int offset, pos;
267 u32 mask_bits;
268
269 if (msi->msi_attrib.is_msix) {
270 offset = msi->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
271 PCI_MSIX_ENTRY_VECTOR_CTRL;
272 msi->masked = readl(msi->mask_base + offset);
273 writel(flag, msi->mask_base + offset);
274 } else if (msi->msi_attrib.maskbit) {
275 pos = (long) msi->mask_base;
276 pci_read_config_dword(msi->dev, pos, &mask_bits);
277 mask_bits &= ~(mask);
278 mask_bits |= flag & mask;
279 pci_write_config_dword(msi->dev, pos, mask_bits);
280 } else
281 return 0;
282
283 msi->msi_attrib.maskbit = !!flag;
284 return 1;
285 }
286
287 static void zpci_enable_irq(struct irq_data *data)
288 {
289 struct msi_desc *msi = irq_get_msi_desc(data->irq);
290
291 zpci_msi_set_mask_bits(msi, 1, 0);
292 }
293
294 static void zpci_disable_irq(struct irq_data *data)
295 {
296 struct msi_desc *msi = irq_get_msi_desc(data->irq);
297
298 zpci_msi_set_mask_bits(msi, 1, 1);
299 }
300
301 void pcibios_fixup_bus(struct pci_bus *bus)
302 {
303 }
304
305 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
306 resource_size_t size,
307 resource_size_t align)
308 {
309 return 0;
310 }
311
312 /* combine single writes by using store-block insn */
313 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
314 {
315 zpci_memcpy_toio(to, from, count);
316 }
317
318 /* Create a virtual mapping cookie for a PCI BAR */
319 void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max)
320 {
321 struct zpci_dev *zdev = get_zdev(pdev);
322 u64 addr;
323 int idx;
324
325 if ((bar & 7) != bar)
326 return NULL;
327
328 idx = zdev->bars[bar].map_idx;
329 spin_lock(&zpci_iomap_lock);
330 zpci_iomap_start[idx].fh = zdev->fh;
331 zpci_iomap_start[idx].bar = bar;
332 spin_unlock(&zpci_iomap_lock);
333
334 addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48);
335 return (void __iomem *) addr;
336 }
337 EXPORT_SYMBOL_GPL(pci_iomap);
338
339 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
340 {
341 unsigned int idx;
342
343 idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48;
344 spin_lock(&zpci_iomap_lock);
345 zpci_iomap_start[idx].fh = 0;
346 zpci_iomap_start[idx].bar = 0;
347 spin_unlock(&zpci_iomap_lock);
348 }
349 EXPORT_SYMBOL_GPL(pci_iounmap);
350
351 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
352 int size, u32 *val)
353 {
354 struct zpci_dev *zdev = get_zdev_by_bus(bus);
355 int ret;
356
357 if (!zdev || devfn != ZPCI_DEVFN)
358 ret = -ENODEV;
359 else
360 ret = zpci_cfg_load(zdev, where, val, size);
361
362 return ret;
363 }
364
365 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
366 int size, u32 val)
367 {
368 struct zpci_dev *zdev = get_zdev_by_bus(bus);
369 int ret;
370
371 if (!zdev || devfn != ZPCI_DEVFN)
372 ret = -ENODEV;
373 else
374 ret = zpci_cfg_store(zdev, where, val, size);
375
376 return ret;
377 }
378
379 static struct pci_ops pci_root_ops = {
380 .read = pci_read,
381 .write = pci_write,
382 };
383
384 static void zpci_irq_handler(struct airq_struct *airq)
385 {
386 unsigned long si, ai;
387 struct airq_iv *aibv;
388 int irqs_on = 0;
389
390 inc_irq_stat(IRQIO_PCI);
391 for (si = 0;;) {
392 /* Scan adapter summary indicator bit vector */
393 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
394 if (si == -1UL) {
395 if (irqs_on++)
396 /* End of second scan with interrupts on. */
397 break;
398 /* First scan complete, reenable interrupts. */
399 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
400 si = 0;
401 continue;
402 }
403
404 /* Scan the adapter interrupt vector for this device. */
405 aibv = zpci_aibv[si];
406 for (ai = 0;;) {
407 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
408 if (ai == -1UL)
409 break;
410 inc_irq_stat(IRQIO_MSI);
411 airq_iv_lock(aibv, ai);
412 generic_handle_irq(airq_iv_get_data(aibv, ai));
413 airq_iv_unlock(aibv, ai);
414 }
415 }
416 }
417
418 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
419 {
420 struct zpci_dev *zdev = get_zdev(pdev);
421 unsigned int hwirq, irq, msi_vecs;
422 unsigned long aisb;
423 struct msi_desc *msi;
424 struct msi_msg msg;
425 int rc;
426
427 pr_debug("%s: requesting %d MSI-X interrupts...", __func__, nvec);
428 if (type != PCI_CAP_ID_MSIX && type != PCI_CAP_ID_MSI)
429 return -EINVAL;
430 msi_vecs = min(nvec, ZPCI_MSI_VEC_MAX);
431 msi_vecs = min_t(unsigned int, msi_vecs, CONFIG_PCI_NR_MSI);
432
433 /* Allocate adapter summary indicator bit */
434 rc = -EIO;
435 aisb = airq_iv_alloc_bit(zpci_aisb_iv);
436 if (aisb == -1UL)
437 goto out;
438 zdev->aisb = aisb;
439
440 /* Create adapter interrupt vector */
441 rc = -ENOMEM;
442 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
443 if (!zdev->aibv)
444 goto out_si;
445
446 /* Wire up shortcut pointer */
447 zpci_aibv[aisb] = zdev->aibv;
448
449 /* Request MSI interrupts */
450 hwirq = 0;
451 list_for_each_entry(msi, &pdev->msi_list, list) {
452 rc = -EIO;
453 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */
454 if (irq == NO_IRQ)
455 goto out_msi;
456 rc = irq_set_msi_desc(irq, msi);
457 if (rc)
458 goto out_msi;
459 irq_set_chip_and_handler(irq, &zpci_irq_chip,
460 handle_simple_irq);
461 msg.data = hwirq;
462 msg.address_lo = zdev->msi_addr & 0xffffffff;
463 msg.address_hi = zdev->msi_addr >> 32;
464 write_msi_msg(irq, &msg);
465 airq_iv_set_data(zdev->aibv, hwirq, irq);
466 hwirq++;
467 }
468
469 /* Enable adapter interrupts */
470 rc = zpci_set_airq(zdev);
471 if (rc)
472 goto out_msi;
473
474 return (msi_vecs == nvec) ? 0 : msi_vecs;
475
476 out_msi:
477 list_for_each_entry(msi, &pdev->msi_list, list) {
478 if (hwirq-- == 0)
479 break;
480 irq_set_msi_desc(msi->irq, NULL);
481 irq_free_desc(msi->irq);
482 msi->msg.address_lo = 0;
483 msi->msg.address_hi = 0;
484 msi->msg.data = 0;
485 msi->irq = 0;
486 }
487 zpci_aibv[aisb] = NULL;
488 airq_iv_release(zdev->aibv);
489 out_si:
490 airq_iv_free_bit(zpci_aisb_iv, aisb);
491 out:
492 dev_err(&pdev->dev, "register MSI failed with: %d\n", rc);
493 return rc;
494 }
495
496 void arch_teardown_msi_irqs(struct pci_dev *pdev)
497 {
498 struct zpci_dev *zdev = get_zdev(pdev);
499 struct msi_desc *msi;
500 int rc;
501
502 pr_info("%s: on pdev: %p\n", __func__, pdev);
503
504 /* Disable adapter interrupts */
505 rc = zpci_clear_airq(zdev);
506 if (rc) {
507 dev_err(&pdev->dev, "deregister MSI failed with: %d\n", rc);
508 return;
509 }
510
511 /* Release MSI interrupts */
512 list_for_each_entry(msi, &pdev->msi_list, list) {
513 zpci_msi_set_mask_bits(msi, 1, 1);
514 irq_set_msi_desc(msi->irq, NULL);
515 irq_free_desc(msi->irq);
516 msi->msg.address_lo = 0;
517 msi->msg.address_hi = 0;
518 msi->msg.data = 0;
519 msi->irq = 0;
520 }
521
522 zpci_aibv[zdev->aisb] = NULL;
523 airq_iv_release(zdev->aibv);
524 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
525 }
526
527 static void zpci_map_resources(struct zpci_dev *zdev)
528 {
529 struct pci_dev *pdev = zdev->pdev;
530 resource_size_t len;
531 int i;
532
533 for (i = 0; i < PCI_BAR_COUNT; i++) {
534 len = pci_resource_len(pdev, i);
535 if (!len)
536 continue;
537 pdev->resource[i].start = (resource_size_t) pci_iomap(pdev, i, 0);
538 pdev->resource[i].end = pdev->resource[i].start + len - 1;
539 }
540 }
541
542 static void zpci_unmap_resources(struct zpci_dev *zdev)
543 {
544 struct pci_dev *pdev = zdev->pdev;
545 resource_size_t len;
546 int i;
547
548 for (i = 0; i < PCI_BAR_COUNT; i++) {
549 len = pci_resource_len(pdev, i);
550 if (!len)
551 continue;
552 pci_iounmap(pdev, (void *) pdev->resource[i].start);
553 }
554 }
555
556 struct zpci_dev *zpci_alloc_device(void)
557 {
558 struct zpci_dev *zdev;
559
560 /* Alloc memory for our private pci device data */
561 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
562 return zdev ? : ERR_PTR(-ENOMEM);
563 }
564
565 void zpci_free_device(struct zpci_dev *zdev)
566 {
567 kfree(zdev);
568 }
569
570 int pcibios_add_platform_entries(struct pci_dev *pdev)
571 {
572 return zpci_sysfs_add_device(&pdev->dev);
573 }
574
575 static int __init zpci_irq_init(void)
576 {
577 int rc;
578
579 rc = register_adapter_interrupt(&zpci_airq);
580 if (rc)
581 goto out;
582 /* Set summary to 1 to be called every time for the ISC. */
583 *zpci_airq.lsi_ptr = 1;
584
585 rc = -ENOMEM;
586 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
587 if (!zpci_aisb_iv)
588 goto out_airq;
589
590 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
591 return 0;
592
593 out_airq:
594 unregister_adapter_interrupt(&zpci_airq);
595 out:
596 return rc;
597 }
598
599 static void zpci_irq_exit(void)
600 {
601 airq_iv_release(zpci_aisb_iv);
602 unregister_adapter_interrupt(&zpci_airq);
603 }
604
605 static struct resource *zpci_alloc_bus_resource(unsigned long start, unsigned long size,
606 unsigned long flags, int domain)
607 {
608 struct resource *r;
609 char *name;
610 int rc;
611
612 r = kzalloc(sizeof(*r), GFP_KERNEL);
613 if (!r)
614 return ERR_PTR(-ENOMEM);
615 r->start = start;
616 r->end = r->start + size - 1;
617 r->flags = flags;
618 r->parent = &iomem_resource;
619 name = kmalloc(18, GFP_KERNEL);
620 if (!name) {
621 kfree(r);
622 return ERR_PTR(-ENOMEM);
623 }
624 sprintf(name, "PCI Bus: %04x:%02x", domain, ZPCI_BUS_NR);
625 r->name = name;
626
627 rc = request_resource(&iomem_resource, r);
628 if (rc)
629 pr_debug("request resource %pR failed\n", r);
630 return r;
631 }
632
633 static int zpci_alloc_iomap(struct zpci_dev *zdev)
634 {
635 int entry;
636
637 spin_lock(&zpci_iomap_lock);
638 entry = find_first_zero_bit(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
639 if (entry == ZPCI_IOMAP_MAX_ENTRIES) {
640 spin_unlock(&zpci_iomap_lock);
641 return -ENOSPC;
642 }
643 set_bit(entry, zpci_iomap);
644 spin_unlock(&zpci_iomap_lock);
645 return entry;
646 }
647
648 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
649 {
650 spin_lock(&zpci_iomap_lock);
651 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
652 clear_bit(entry, zpci_iomap);
653 spin_unlock(&zpci_iomap_lock);
654 }
655
656 int pcibios_add_device(struct pci_dev *pdev)
657 {
658 struct zpci_dev *zdev = get_zdev(pdev);
659 struct resource *res;
660 int i;
661
662 zdev->pdev = pdev;
663 zpci_map_resources(zdev);
664
665 for (i = 0; i < PCI_BAR_COUNT; i++) {
666 res = &pdev->resource[i];
667 if (res->parent || !res->flags)
668 continue;
669 pci_claim_resource(pdev, i);
670 }
671
672 return 0;
673 }
674
675 int pcibios_enable_device(struct pci_dev *pdev, int mask)
676 {
677 struct zpci_dev *zdev = get_zdev(pdev);
678 struct resource *res;
679 u16 cmd;
680 int i;
681
682 zdev->pdev = pdev;
683 zpci_debug_init_device(zdev);
684 zpci_fmb_enable_device(zdev);
685 zpci_map_resources(zdev);
686
687 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
688 for (i = 0; i < PCI_BAR_COUNT; i++) {
689 res = &pdev->resource[i];
690
691 if (res->flags & IORESOURCE_IO)
692 return -EINVAL;
693
694 if (res->flags & IORESOURCE_MEM)
695 cmd |= PCI_COMMAND_MEMORY;
696 }
697 pci_write_config_word(pdev, PCI_COMMAND, cmd);
698 return 0;
699 }
700
701 void pcibios_disable_device(struct pci_dev *pdev)
702 {
703 struct zpci_dev *zdev = get_zdev(pdev);
704
705 zpci_unmap_resources(zdev);
706 zpci_fmb_disable_device(zdev);
707 zpci_debug_exit_device(zdev);
708 zdev->pdev = NULL;
709 }
710
711 static int zpci_scan_bus(struct zpci_dev *zdev)
712 {
713 struct resource *res;
714 LIST_HEAD(resources);
715 int i;
716
717 /* allocate mapping entry for each used bar */
718 for (i = 0; i < PCI_BAR_COUNT; i++) {
719 unsigned long addr, size, flags;
720 int entry;
721
722 if (!zdev->bars[i].size)
723 continue;
724 entry = zpci_alloc_iomap(zdev);
725 if (entry < 0)
726 return entry;
727 zdev->bars[i].map_idx = entry;
728
729 /* only MMIO is supported */
730 flags = IORESOURCE_MEM;
731 if (zdev->bars[i].val & 8)
732 flags |= IORESOURCE_PREFETCH;
733 if (zdev->bars[i].val & 4)
734 flags |= IORESOURCE_MEM_64;
735
736 addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48);
737
738 size = 1UL << zdev->bars[i].size;
739
740 res = zpci_alloc_bus_resource(addr, size, flags, zdev->domain);
741 if (IS_ERR(res)) {
742 zpci_free_iomap(zdev, entry);
743 return PTR_ERR(res);
744 }
745 pci_add_resource(&resources, res);
746 }
747
748 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
749 zdev, &resources);
750 if (!zdev->bus)
751 return -EIO;
752
753 zdev->bus->max_bus_speed = zdev->max_bus_speed;
754 return 0;
755 }
756
757 static int zpci_alloc_domain(struct zpci_dev *zdev)
758 {
759 spin_lock(&zpci_domain_lock);
760 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
761 if (zdev->domain == ZPCI_NR_DEVICES) {
762 spin_unlock(&zpci_domain_lock);
763 return -ENOSPC;
764 }
765 set_bit(zdev->domain, zpci_domain);
766 spin_unlock(&zpci_domain_lock);
767 return 0;
768 }
769
770 static void zpci_free_domain(struct zpci_dev *zdev)
771 {
772 spin_lock(&zpci_domain_lock);
773 clear_bit(zdev->domain, zpci_domain);
774 spin_unlock(&zpci_domain_lock);
775 }
776
777 int zpci_enable_device(struct zpci_dev *zdev)
778 {
779 int rc;
780
781 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
782 if (rc)
783 goto out;
784 pr_info("Enabled fh: 0x%x fid: 0x%x\n", zdev->fh, zdev->fid);
785
786 rc = zpci_dma_init_device(zdev);
787 if (rc)
788 goto out_dma;
789
790 zdev->state = ZPCI_FN_STATE_ONLINE;
791 return 0;
792
793 out_dma:
794 clp_disable_fh(zdev);
795 out:
796 return rc;
797 }
798 EXPORT_SYMBOL_GPL(zpci_enable_device);
799
800 int zpci_disable_device(struct zpci_dev *zdev)
801 {
802 zpci_dma_exit_device(zdev);
803 return clp_disable_fh(zdev);
804 }
805 EXPORT_SYMBOL_GPL(zpci_disable_device);
806
807 int zpci_create_device(struct zpci_dev *zdev)
808 {
809 int rc;
810
811 rc = zpci_alloc_domain(zdev);
812 if (rc)
813 goto out;
814
815 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
816 rc = zpci_enable_device(zdev);
817 if (rc)
818 goto out_free;
819 }
820 rc = zpci_scan_bus(zdev);
821 if (rc)
822 goto out_disable;
823
824 spin_lock(&zpci_list_lock);
825 list_add_tail(&zdev->entry, &zpci_list);
826 spin_unlock(&zpci_list_lock);
827
828 zpci_init_slot(zdev);
829
830 return 0;
831
832 out_disable:
833 if (zdev->state == ZPCI_FN_STATE_ONLINE)
834 zpci_disable_device(zdev);
835 out_free:
836 zpci_free_domain(zdev);
837 out:
838 return rc;
839 }
840
841 void zpci_stop_device(struct zpci_dev *zdev)
842 {
843 zpci_dma_exit_device(zdev);
844 /*
845 * Note: SCLP disables fh via set-pci-fn so don't
846 * do that here.
847 */
848 }
849 EXPORT_SYMBOL_GPL(zpci_stop_device);
850
851 static inline int barsize(u8 size)
852 {
853 return (size) ? (1 << size) >> 10 : 0;
854 }
855
856 static int zpci_mem_init(void)
857 {
858 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
859 16, 0, NULL);
860 if (!zdev_fmb_cache)
861 goto error_zdev;
862
863 /* TODO: use realloc */
864 zpci_iomap_start = kzalloc(ZPCI_IOMAP_MAX_ENTRIES * sizeof(*zpci_iomap_start),
865 GFP_KERNEL);
866 if (!zpci_iomap_start)
867 goto error_iomap;
868 return 0;
869
870 error_iomap:
871 kmem_cache_destroy(zdev_fmb_cache);
872 error_zdev:
873 return -ENOMEM;
874 }
875
876 static void zpci_mem_exit(void)
877 {
878 kfree(zpci_iomap_start);
879 kmem_cache_destroy(zdev_fmb_cache);
880 }
881
882 static unsigned int s390_pci_probe;
883
884 char * __init pcibios_setup(char *str)
885 {
886 if (!strcmp(str, "on")) {
887 s390_pci_probe = 1;
888 return NULL;
889 }
890 return str;
891 }
892
893 static int __init pci_base_init(void)
894 {
895 int rc;
896
897 if (!s390_pci_probe)
898 return 0;
899
900 if (!test_facility(2) || !test_facility(69)
901 || !test_facility(71) || !test_facility(72))
902 return 0;
903
904 pr_info("Probing PCI hardware: PCI:%d SID:%d AEN:%d\n",
905 test_facility(69), test_facility(70),
906 test_facility(71));
907
908 rc = zpci_debug_init();
909 if (rc)
910 goto out;
911
912 rc = zpci_mem_init();
913 if (rc)
914 goto out_mem;
915
916 rc = zpci_irq_init();
917 if (rc)
918 goto out_irq;
919
920 rc = zpci_dma_init();
921 if (rc)
922 goto out_dma;
923
924 rc = clp_scan_pci_devices();
925 if (rc)
926 goto out_find;
927
928 return 0;
929
930 out_find:
931 zpci_dma_exit();
932 out_dma:
933 zpci_irq_exit();
934 out_irq:
935 zpci_mem_exit();
936 out_mem:
937 zpci_debug_exit();
938 out:
939 return rc;
940 }
941 subsys_initcall_sync(pci_base_init);
942
943 void zpci_rescan(void)
944 {
945 clp_rescan_pci_devices_simple();
946 }
Linux with added FPC-III support