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eeepc-laptop: Register as a pci-hotplug device
[linux-2.6/linux-acpi-2.6.git] / arch / sparc / kernel / pci.c
blob57859ad235473ebde5086ecf76021b03c8a40e8b
1 /* pci.c: UltraSparc PCI controller support.
2 *
3 * Copyright (C) 1997, 1998, 1999 David S. Miller (davem@redhat.com)
4 * Copyright (C) 1998, 1999 Eddie C. Dost (ecd@skynet.be)
5 * Copyright (C) 1999 Jakub Jelinek (jj@ultra.linux.cz)
6 *
7 * OF tree based PCI bus probing taken from the PowerPC port
8 * with minor modifications, see there for credits.
9 */
10
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/string.h>
14 #include <linux/sched.h>
15 #include <linux/capability.h>
16 #include <linux/errno.h>
17 #include <linux/pci.h>
18 #include <linux/msi.h>
19 #include <linux/irq.h>
20 #include <linux/init.h>
21 #include <linux/of.h>
22 #include <linux/of_device.h>
23
24 #include <asm/uaccess.h>
25 #include <asm/pgtable.h>
26 #include <asm/irq.h>
27 #include <asm/prom.h>
28 #include <asm/apb.h>
29
30 #include "pci_impl.h"
31
32 /* List of all PCI controllers found in the system. */
33 struct pci_pbm_info *pci_pbm_root = NULL;
34
35 /* Each PBM found gets a unique index. */
36 int pci_num_pbms = 0;
37
38 volatile int pci_poke_in_progress;
39 volatile int pci_poke_cpu = -1;
40 volatile int pci_poke_faulted;
41
42 static DEFINE_SPINLOCK(pci_poke_lock);
43
44 void pci_config_read8(u8 *addr, u8 *ret)
45 {
46 unsigned long flags;
47 u8 byte;
48
49 spin_lock_irqsave(&pci_poke_lock, flags);
50 pci_poke_cpu = smp_processor_id();
51 pci_poke_in_progress = 1;
52 pci_poke_faulted = 0;
53 __asm__ __volatile__("membar #Sync\n\t"
54 "lduba [%1] %2, %0\n\t"
55 "membar #Sync"
56 : "=r" (byte)
57 : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
58 : "memory");
59 pci_poke_in_progress = 0;
60 pci_poke_cpu = -1;
61 if (!pci_poke_faulted)
62 *ret = byte;
63 spin_unlock_irqrestore(&pci_poke_lock, flags);
64 }
65
66 void pci_config_read16(u16 *addr, u16 *ret)
67 {
68 unsigned long flags;
69 u16 word;
70
71 spin_lock_irqsave(&pci_poke_lock, flags);
72 pci_poke_cpu = smp_processor_id();
73 pci_poke_in_progress = 1;
74 pci_poke_faulted = 0;
75 __asm__ __volatile__("membar #Sync\n\t"
76 "lduha [%1] %2, %0\n\t"
77 "membar #Sync"
78 : "=r" (word)
79 : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
80 : "memory");
81 pci_poke_in_progress = 0;
82 pci_poke_cpu = -1;
83 if (!pci_poke_faulted)
84 *ret = word;
85 spin_unlock_irqrestore(&pci_poke_lock, flags);
86 }
87
88 void pci_config_read32(u32 *addr, u32 *ret)
89 {
90 unsigned long flags;
91 u32 dword;
92
93 spin_lock_irqsave(&pci_poke_lock, flags);
94 pci_poke_cpu = smp_processor_id();
95 pci_poke_in_progress = 1;
96 pci_poke_faulted = 0;
97 __asm__ __volatile__("membar #Sync\n\t"
98 "lduwa [%1] %2, %0\n\t"
99 "membar #Sync"
100 : "=r" (dword)
101 : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
102 : "memory");
103 pci_poke_in_progress = 0;
104 pci_poke_cpu = -1;
105 if (!pci_poke_faulted)
106 *ret = dword;
107 spin_unlock_irqrestore(&pci_poke_lock, flags);
108 }
109
110 void pci_config_write8(u8 *addr, u8 val)
111 {
112 unsigned long flags;
113
114 spin_lock_irqsave(&pci_poke_lock, flags);
115 pci_poke_cpu = smp_processor_id();
116 pci_poke_in_progress = 1;
117 pci_poke_faulted = 0;
118 __asm__ __volatile__("membar #Sync\n\t"
119 "stba %0, [%1] %2\n\t"
120 "membar #Sync"
121 : /* no outputs */
122 : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
123 : "memory");
124 pci_poke_in_progress = 0;
125 pci_poke_cpu = -1;
126 spin_unlock_irqrestore(&pci_poke_lock, flags);
127 }
128
129 void pci_config_write16(u16 *addr, u16 val)
130 {
131 unsigned long flags;
132
133 spin_lock_irqsave(&pci_poke_lock, flags);
134 pci_poke_cpu = smp_processor_id();
135 pci_poke_in_progress = 1;
136 pci_poke_faulted = 0;
137 __asm__ __volatile__("membar #Sync\n\t"
138 "stha %0, [%1] %2\n\t"
139 "membar #Sync"
140 : /* no outputs */
141 : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
142 : "memory");
143 pci_poke_in_progress = 0;
144 pci_poke_cpu = -1;
145 spin_unlock_irqrestore(&pci_poke_lock, flags);
146 }
147
148 void pci_config_write32(u32 *addr, u32 val)
149 {
150 unsigned long flags;
151
152 spin_lock_irqsave(&pci_poke_lock, flags);
153 pci_poke_cpu = smp_processor_id();
154 pci_poke_in_progress = 1;
155 pci_poke_faulted = 0;
156 __asm__ __volatile__("membar #Sync\n\t"
157 "stwa %0, [%1] %2\n\t"
158 "membar #Sync"
159 : /* no outputs */
160 : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
161 : "memory");
162 pci_poke_in_progress = 0;
163 pci_poke_cpu = -1;
164 spin_unlock_irqrestore(&pci_poke_lock, flags);
165 }
166
167 static int ofpci_verbose;
168
169 static int __init ofpci_debug(char *str)
170 {
171 int val = 0;
172
173 get_option(&str, &val);
174 if (val)
175 ofpci_verbose = 1;
176 return 1;
177 }
178
179 __setup("ofpci_debug=", ofpci_debug);
180
181 static unsigned long pci_parse_of_flags(u32 addr0)
182 {
183 unsigned long flags = 0;
184
185 if (addr0 & 0x02000000) {
186 flags = IORESOURCE_MEM | PCI_BASE_ADDRESS_SPACE_MEMORY;
187 flags |= (addr0 >> 22) & PCI_BASE_ADDRESS_MEM_TYPE_64;
188 flags |= (addr0 >> 28) & PCI_BASE_ADDRESS_MEM_TYPE_1M;
189 if (addr0 & 0x40000000)
190 flags |= IORESOURCE_PREFETCH
191 | PCI_BASE_ADDRESS_MEM_PREFETCH;
192 } else if (addr0 & 0x01000000)
193 flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO;
194 return flags;
195 }
196
197 /* The of_device layer has translated all of the assigned-address properties
198 * into physical address resources, we only have to figure out the register
199 * mapping.
200 */
201 static void pci_parse_of_addrs(struct of_device *op,
202 struct device_node *node,
203 struct pci_dev *dev)
204 {
205 struct resource *op_res;
206 const u32 *addrs;
207 int proplen;
208
209 addrs = of_get_property(node, "assigned-addresses", &proplen);
210 if (!addrs)
211 return;
212 if (ofpci_verbose)
213 printk(" parse addresses (%d bytes) @ %p\n",
214 proplen, addrs);
215 op_res = &op->resource[0];
216 for (; proplen >= 20; proplen -= 20, addrs += 5, op_res++) {
217 struct resource *res;
218 unsigned long flags;
219 int i;
220
221 flags = pci_parse_of_flags(addrs[0]);
222 if (!flags)
223 continue;
224 i = addrs[0] & 0xff;
225 if (ofpci_verbose)
226 printk(" start: %llx, end: %llx, i: %x\n",
227 op_res->start, op_res->end, i);
228
229 if (PCI_BASE_ADDRESS_0 <= i && i <= PCI_BASE_ADDRESS_5) {
230 res = &dev->resource[(i - PCI_BASE_ADDRESS_0) >> 2];
231 } else if (i == dev->rom_base_reg) {
232 res = &dev->resource[PCI_ROM_RESOURCE];
233 flags |= IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
234 } else {
235 printk(KERN_ERR "PCI: bad cfg reg num 0x%x\n", i);
236 continue;
237 }
238 res->start = op_res->start;
239 res->end = op_res->end;
240 res->flags = flags;
241 res->name = pci_name(dev);
242 }
243 }
244
245 static struct pci_dev *of_create_pci_dev(struct pci_pbm_info *pbm,
246 struct device_node *node,
247 struct pci_bus *bus, int devfn)
248 {
249 struct dev_archdata *sd;
250 struct of_device *op;
251 struct pci_dev *dev;
252 const char *type;
253 u32 class;
254
255 dev = alloc_pci_dev();
256 if (!dev)
257 return NULL;
258
259 sd = &dev->dev.archdata;
260 sd->iommu = pbm->iommu;
261 sd->stc = &pbm->stc;
262 sd->host_controller = pbm;
263 sd->prom_node = node;
264 sd->op = op = of_find_device_by_node(node);
265 sd->numa_node = pbm->numa_node;
266
267 sd = &op->dev.archdata;
268 sd->iommu = pbm->iommu;
269 sd->stc = &pbm->stc;
270 sd->numa_node = pbm->numa_node;
271
272 if (!strcmp(node->name, "ebus"))
273 of_propagate_archdata(op);
274
275 type = of_get_property(node, "device_type", NULL);
276 if (type == NULL)
277 type = "";
278
279 if (ofpci_verbose)
280 printk(" create device, devfn: %x, type: %s\n",
281 devfn, type);
282
283 dev->bus = bus;
284 dev->sysdata = node;
285 dev->dev.parent = bus->bridge;
286 dev->dev.bus = &pci_bus_type;
287 dev->devfn = devfn;
288 dev->multifunction = 0; /* maybe a lie? */
289
290 dev->vendor = of_getintprop_default(node, "vendor-id", 0xffff);
291 dev->device = of_getintprop_default(node, "device-id", 0xffff);
292 dev->subsystem_vendor =
293 of_getintprop_default(node, "subsystem-vendor-id", 0);
294 dev->subsystem_device =
295 of_getintprop_default(node, "subsystem-id", 0);
296
297 dev->cfg_size = pci_cfg_space_size(dev);
298
299 /* We can't actually use the firmware value, we have
300 * to read what is in the register right now. One
301 * reason is that in the case of IDE interfaces the
302 * firmware can sample the value before the the IDE
303 * interface is programmed into native mode.
304 */
305 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
306 dev->class = class >> 8;
307 dev->revision = class & 0xff;
308
309 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(bus),
310 dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));
311
312 if (ofpci_verbose)
313 printk(" class: 0x%x device name: %s\n",
314 dev->class, pci_name(dev));
315
316 /* I have seen IDE devices which will not respond to
317 * the bmdma simplex check reads if bus mastering is
318 * disabled.
319 */
320 if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE)
321 pci_set_master(dev);
322
323 dev->current_state = 4; /* unknown power state */
324 dev->error_state = pci_channel_io_normal;
325
326 if (!strcmp(node->name, "pci")) {
327 /* a PCI-PCI bridge */
328 dev->hdr_type = PCI_HEADER_TYPE_BRIDGE;
329 dev->rom_base_reg = PCI_ROM_ADDRESS1;
330 } else if (!strcmp(type, "cardbus")) {
331 dev->hdr_type = PCI_HEADER_TYPE_CARDBUS;
332 } else {
333 dev->hdr_type = PCI_HEADER_TYPE_NORMAL;
334 dev->rom_base_reg = PCI_ROM_ADDRESS;
335
336 dev->irq = sd->op->irqs[0];
337 if (dev->irq == 0xffffffff)
338 dev->irq = PCI_IRQ_NONE;
339 }
340
341 pci_parse_of_addrs(sd->op, node, dev);
342
343 if (ofpci_verbose)
344 printk(" adding to system ...\n");
345
346 pci_device_add(dev, bus);
347
348 return dev;
349 }
350
351 static void __devinit apb_calc_first_last(u8 map, u32 *first_p, u32 *last_p)
352 {
353 u32 idx, first, last;
354
355 first = 8;
356 last = 0;
357 for (idx = 0; idx < 8; idx++) {
358 if ((map & (1 << idx)) != 0) {
359 if (first > idx)
360 first = idx;
361 if (last < idx)
362 last = idx;
363 }
364 }
365
366 *first_p = first;
367 *last_p = last;
368 }
369
370 static void pci_resource_adjust(struct resource *res,
371 struct resource *root)
372 {
373 res->start += root->start;
374 res->end += root->start;
375 }
376
377 /* For PCI bus devices which lack a 'ranges' property we interrogate
378 * the config space values to set the resources, just like the generic
379 * Linux PCI probing code does.
380 */
381 static void __devinit pci_cfg_fake_ranges(struct pci_dev *dev,
382 struct pci_bus *bus,
383 struct pci_pbm_info *pbm)
384 {
385 struct resource *res;
386 u8 io_base_lo, io_limit_lo;
387 u16 mem_base_lo, mem_limit_lo;
388 unsigned long base, limit;
389
390 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
391 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
392 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
393 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
394
395 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
396 u16 io_base_hi, io_limit_hi;
397
398 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
399 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
400 base |= (io_base_hi << 16);
401 limit |= (io_limit_hi << 16);
402 }
403
404 res = bus->resource[0];
405 if (base <= limit) {
406 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
407 if (!res->start)
408 res->start = base;
409 if (!res->end)
410 res->end = limit + 0xfff;
411 pci_resource_adjust(res, &pbm->io_space);
412 }
413
414 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
415 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
416 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
417 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
418
419 res = bus->resource[1];
420 if (base <= limit) {
421 res->flags = ((mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) |
422 IORESOURCE_MEM);
423 res->start = base;
424 res->end = limit + 0xfffff;
425 pci_resource_adjust(res, &pbm->mem_space);
426 }
427
428 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
429 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
430 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
431 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
432
433 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
434 u32 mem_base_hi, mem_limit_hi;
435
436 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
437 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
438
439 /*
440 * Some bridges set the base > limit by default, and some
441 * (broken) BIOSes do not initialize them. If we find
442 * this, just assume they are not being used.
443 */
444 if (mem_base_hi <= mem_limit_hi) {
445 base |= ((long) mem_base_hi) << 32;
446 limit |= ((long) mem_limit_hi) << 32;
447 }
448 }
449
450 res = bus->resource[2];
451 if (base <= limit) {
452 res->flags = ((mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) |
453 IORESOURCE_MEM | IORESOURCE_PREFETCH);
454 res->start = base;
455 res->end = limit + 0xfffff;
456 pci_resource_adjust(res, &pbm->mem_space);
457 }
458 }
459
460 /* Cook up fake bus resources for SUNW,simba PCI bridges which lack
461 * a proper 'ranges' property.
462 */
463 static void __devinit apb_fake_ranges(struct pci_dev *dev,
464 struct pci_bus *bus,
465 struct pci_pbm_info *pbm)
466 {
467 struct resource *res;
468 u32 first, last;
469 u8 map;
470
471 pci_read_config_byte(dev, APB_IO_ADDRESS_MAP, &map);
472 apb_calc_first_last(map, &first, &last);
473 res = bus->resource[0];
474 res->start = (first << 21);
475 res->end = (last << 21) + ((1 << 21) - 1);
476 res->flags = IORESOURCE_IO;
477 pci_resource_adjust(res, &pbm->io_space);
478
479 pci_read_config_byte(dev, APB_MEM_ADDRESS_MAP, &map);
480 apb_calc_first_last(map, &first, &last);
481 res = bus->resource[1];
482 res->start = (first << 21);
483 res->end = (last << 21) + ((1 << 21) - 1);
484 res->flags = IORESOURCE_MEM;
485 pci_resource_adjust(res, &pbm->mem_space);
486 }
487
488 static void __devinit pci_of_scan_bus(struct pci_pbm_info *pbm,
489 struct device_node *node,
490 struct pci_bus *bus);
491
492 #define GET_64BIT(prop, i) ((((u64) (prop)[(i)]) << 32) | (prop)[(i)+1])
493
494 static void __devinit of_scan_pci_bridge(struct pci_pbm_info *pbm,
495 struct device_node *node,
496 struct pci_dev *dev)
497 {
498 struct pci_bus *bus;
499 const u32 *busrange, *ranges;
500 int len, i, simba;
501 struct resource *res;
502 unsigned int flags;
503 u64 size;
504
505 if (ofpci_verbose)
506 printk("of_scan_pci_bridge(%s)\n", node->full_name);
507
508 /* parse bus-range property */
509 busrange = of_get_property(node, "bus-range", &len);
510 if (busrange == NULL || len != 8) {
511 printk(KERN_DEBUG "Can't get bus-range for PCI-PCI bridge %s\n",
512 node->full_name);
513 return;
514 }
515 ranges = of_get_property(node, "ranges", &len);
516 simba = 0;
517 if (ranges == NULL) {
518 const char *model = of_get_property(node, "model", NULL);
519 if (model && !strcmp(model, "SUNW,simba"))
520 simba = 1;
521 }
522
523 bus = pci_add_new_bus(dev->bus, dev, busrange[0]);
524 if (!bus) {
525 printk(KERN_ERR "Failed to create pci bus for %s\n",
526 node->full_name);
527 return;
528 }
529
530 bus->primary = dev->bus->number;
531 bus->subordinate = busrange[1];
532 bus->bridge_ctl = 0;
533
534 /* parse ranges property, or cook one up by hand for Simba */
535 /* PCI #address-cells == 3 and #size-cells == 2 always */
536 res = &dev->resource[PCI_BRIDGE_RESOURCES];
537 for (i = 0; i < PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES; ++i) {
538 res->flags = 0;
539 bus->resource[i] = res;
540 ++res;
541 }
542 if (simba) {
543 apb_fake_ranges(dev, bus, pbm);
544 goto after_ranges;
545 } else if (ranges == NULL) {
546 pci_cfg_fake_ranges(dev, bus, pbm);
547 goto after_ranges;
548 }
549 i = 1;
550 for (; len >= 32; len -= 32, ranges += 8) {
551 struct resource *root;
552
553 flags = pci_parse_of_flags(ranges[0]);
554 size = GET_64BIT(ranges, 6);
555 if (flags == 0 || size == 0)
556 continue;
557 if (flags & IORESOURCE_IO) {
558 res = bus->resource[0];
559 if (res->flags) {
560 printk(KERN_ERR "PCI: ignoring extra I/O range"
561 " for bridge %s\n", node->full_name);
562 continue;
563 }
564 root = &pbm->io_space;
565 } else {
566 if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) {
567 printk(KERN_ERR "PCI: too many memory ranges"
568 " for bridge %s\n", node->full_name);
569 continue;
570 }
571 res = bus->resource[i];
572 ++i;
573 root = &pbm->mem_space;
574 }
575
576 res->start = GET_64BIT(ranges, 1);
577 res->end = res->start + size - 1;
578 res->flags = flags;
579
580 /* Another way to implement this would be to add an of_device
581 * layer routine that can calculate a resource for a given
582 * range property value in a PCI device.
583 */
584 pci_resource_adjust(res, root);
585 }
586 after_ranges:
587 sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus),
588 bus->number);
589 if (ofpci_verbose)
590 printk(" bus name: %s\n", bus->name);
591
592 pci_of_scan_bus(pbm, node, bus);
593 }
594
595 static void __devinit pci_of_scan_bus(struct pci_pbm_info *pbm,
596 struct device_node *node,
597 struct pci_bus *bus)
598 {
599 struct device_node *child;
600 const u32 *reg;
601 int reglen, devfn, prev_devfn;
602 struct pci_dev *dev;
603
604 if (ofpci_verbose)
605 printk("PCI: scan_bus[%s] bus no %d\n",
606 node->full_name, bus->number);
607
608 child = NULL;
609 prev_devfn = -1;
610 while ((child = of_get_next_child(node, child)) != NULL) {
611 if (ofpci_verbose)
612 printk(" * %s\n", child->full_name);
613 reg = of_get_property(child, "reg", &reglen);
614 if (reg == NULL || reglen < 20)
615 continue;
616
617 devfn = (reg[0] >> 8) & 0xff;
618
619 /* This is a workaround for some device trees
620 * which list PCI devices twice. On the V100
621 * for example, device number 3 is listed twice.
622 * Once as "pm" and once again as "lomp".
623 */
624 if (devfn == prev_devfn)
625 continue;
626 prev_devfn = devfn;
627
628 /* create a new pci_dev for this device */
629 dev = of_create_pci_dev(pbm, child, bus, devfn);
630 if (!dev)
631 continue;
632 if (ofpci_verbose)
633 printk("PCI: dev header type: %x\n",
634 dev->hdr_type);
635
636 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
637 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
638 of_scan_pci_bridge(pbm, child, dev);
639 }
640 }
641
642 static ssize_t
643 show_pciobppath_attr(struct device * dev, struct device_attribute * attr, char * buf)
644 {
645 struct pci_dev *pdev;
646 struct device_node *dp;
647
648 pdev = to_pci_dev(dev);
649 dp = pdev->dev.archdata.prom_node;
650
651 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
652 }
653
654 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, show_pciobppath_attr, NULL);
655
656 static void __devinit pci_bus_register_of_sysfs(struct pci_bus *bus)
657 {
658 struct pci_dev *dev;
659 struct pci_bus *child_bus;
660 int err;
661
662 list_for_each_entry(dev, &bus->devices, bus_list) {
663 /* we don't really care if we can create this file or
664 * not, but we need to assign the result of the call
665 * or the world will fall under alien invasion and
666 * everybody will be frozen on a spaceship ready to be
667 * eaten on alpha centauri by some green and jelly
668 * humanoid.
669 */
670 err = sysfs_create_file(&dev->dev.kobj, &dev_attr_obppath.attr);
671 }
672 list_for_each_entry(child_bus, &bus->children, node)
673 pci_bus_register_of_sysfs(child_bus);
674 }
675
676 struct pci_bus * __devinit pci_scan_one_pbm(struct pci_pbm_info *pbm,
677 struct device *parent)
678 {
679 struct device_node *node = pbm->op->node;
680 struct pci_bus *bus;
681
682 printk("PCI: Scanning PBM %s\n", node->full_name);
683
684 bus = pci_create_bus(parent, pbm->pci_first_busno, pbm->pci_ops, pbm);
685 if (!bus) {
686 printk(KERN_ERR "Failed to create bus for %s\n",
687 node->full_name);
688 return NULL;
689 }
690 bus->secondary = pbm->pci_first_busno;
691 bus->subordinate = pbm->pci_last_busno;
692
693 bus->resource[0] = &pbm->io_space;
694 bus->resource[1] = &pbm->mem_space;
695
696 pci_of_scan_bus(pbm, node, bus);
697 pci_bus_add_devices(bus);
698 pci_bus_register_of_sysfs(bus);
699
700 return bus;
701 }
702
703 void __devinit pcibios_fixup_bus(struct pci_bus *pbus)
704 {
705 struct pci_pbm_info *pbm = pbus->sysdata;
706
707 /* Generic PCI bus probing sets these to point at
708 * &io{port,mem}_resouce which is wrong for us.
709 */
710 pbus->resource[0] = &pbm->io_space;
711 pbus->resource[1] = &pbm->mem_space;
712 }
713
714 void pcibios_update_irq(struct pci_dev *pdev, int irq)
715 {
716 }
717
718 void pcibios_align_resource(void *data, struct resource *res,
719 resource_size_t size, resource_size_t align)
720 {
721 }
722
723 int pcibios_enable_device(struct pci_dev *dev, int mask)
724 {
725 u16 cmd, oldcmd;
726 int i;
727
728 pci_read_config_word(dev, PCI_COMMAND, &cmd);
729 oldcmd = cmd;
730
731 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
732 struct resource *res = &dev->resource[i];
733
734 /* Only set up the requested stuff */
735 if (!(mask & (1<<i)))
736 continue;
737
738 if (res->flags & IORESOURCE_IO)
739 cmd |= PCI_COMMAND_IO;
740 if (res->flags & IORESOURCE_MEM)
741 cmd |= PCI_COMMAND_MEMORY;
742 }
743
744 if (cmd != oldcmd) {
745 printk(KERN_DEBUG "PCI: Enabling device: (%s), cmd %x\n",
746 pci_name(dev), cmd);
747 /* Enable the appropriate bits in the PCI command register. */
748 pci_write_config_word(dev, PCI_COMMAND, cmd);
749 }
750 return 0;
751 }
752
753 void pcibios_resource_to_bus(struct pci_dev *pdev, struct pci_bus_region *region,
754 struct resource *res)
755 {
756 struct pci_pbm_info *pbm = pdev->bus->sysdata;
757 struct resource zero_res, *root;
758
759 zero_res.start = 0;
760 zero_res.end = 0;
761 zero_res.flags = res->flags;
762
763 if (res->flags & IORESOURCE_IO)
764 root = &pbm->io_space;
765 else
766 root = &pbm->mem_space;
767
768 pci_resource_adjust(&zero_res, root);
769
770 region->start = res->start - zero_res.start;
771 region->end = res->end - zero_res.start;
772 }
773 EXPORT_SYMBOL(pcibios_resource_to_bus);
774
775 void pcibios_bus_to_resource(struct pci_dev *pdev, struct resource *res,
776 struct pci_bus_region *region)
777 {
778 struct pci_pbm_info *pbm = pdev->bus->sysdata;
779 struct resource *root;
780
781 res->start = region->start;
782 res->end = region->end;
783
784 if (res->flags & IORESOURCE_IO)
785 root = &pbm->io_space;
786 else
787 root = &pbm->mem_space;
788
789 pci_resource_adjust(res, root);
790 }
791 EXPORT_SYMBOL(pcibios_bus_to_resource);
792
793 char * __devinit pcibios_setup(char *str)
794 {
795 return str;
796 }
797
798 /* Platform support for /proc/bus/pci/X/Y mmap()s. */
799
800 /* If the user uses a host-bridge as the PCI device, he may use
801 * this to perform a raw mmap() of the I/O or MEM space behind
802 * that controller.
803 *
804 * This can be useful for execution of x86 PCI bios initialization code
805 * on a PCI card, like the xfree86 int10 stuff does.
806 */
807 static int __pci_mmap_make_offset_bus(struct pci_dev *pdev, struct vm_area_struct *vma,
808 enum pci_mmap_state mmap_state)
809 {
810 struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
811 unsigned long space_size, user_offset, user_size;
812
813 if (mmap_state == pci_mmap_io) {
814 space_size = (pbm->io_space.end -
815 pbm->io_space.start) + 1;
816 } else {
817 space_size = (pbm->mem_space.end -
818 pbm->mem_space.start) + 1;
819 }
820
821 /* Make sure the request is in range. */
822 user_offset = vma->vm_pgoff << PAGE_SHIFT;
823 user_size = vma->vm_end - vma->vm_start;
824
825 if (user_offset >= space_size ||
826 (user_offset + user_size) > space_size)
827 return -EINVAL;
828
829 if (mmap_state == pci_mmap_io) {
830 vma->vm_pgoff = (pbm->io_space.start +
831 user_offset) >> PAGE_SHIFT;
832 } else {
833 vma->vm_pgoff = (pbm->mem_space.start +
834 user_offset) >> PAGE_SHIFT;
835 }
836
837 return 0;
838 }
839
840 /* Adjust vm_pgoff of VMA such that it is the physical page offset
841 * corresponding to the 32-bit pci bus offset for DEV requested by the user.
842 *
843 * Basically, the user finds the base address for his device which he wishes
844 * to mmap. They read the 32-bit value from the config space base register,
845 * add whatever PAGE_SIZE multiple offset they wish, and feed this into the
846 * offset parameter of mmap on /proc/bus/pci/XXX for that device.
847 *
848 * Returns negative error code on failure, zero on success.
849 */
850 static int __pci_mmap_make_offset(struct pci_dev *pdev,
851 struct vm_area_struct *vma,
852 enum pci_mmap_state mmap_state)
853 {
854 unsigned long user_paddr, user_size;
855 int i, err;
856
857 /* First compute the physical address in vma->vm_pgoff,
858 * making sure the user offset is within range in the
859 * appropriate PCI space.
860 */
861 err = __pci_mmap_make_offset_bus(pdev, vma, mmap_state);
862 if (err)
863 return err;
864
865 /* If this is a mapping on a host bridge, any address
866 * is OK.
867 */
868 if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
869 return err;
870
871 /* Otherwise make sure it's in the range for one of the
872 * device's resources.
873 */
874 user_paddr = vma->vm_pgoff << PAGE_SHIFT;
875 user_size = vma->vm_end - vma->vm_start;
876
877 for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
878 struct resource *rp = &pdev->resource[i];
879 resource_size_t aligned_end;
880
881 /* Active? */
882 if (!rp->flags)
883 continue;
884
885 /* Same type? */
886 if (i == PCI_ROM_RESOURCE) {
887 if (mmap_state != pci_mmap_mem)
888 continue;
889 } else {
890 if ((mmap_state == pci_mmap_io &&
891 (rp->flags & IORESOURCE_IO) == 0) ||
892 (mmap_state == pci_mmap_mem &&
893 (rp->flags & IORESOURCE_MEM) == 0))
894 continue;
895 }
896
897 /* Align the resource end to the next page address.
898 * PAGE_SIZE intentionally added instead of (PAGE_SIZE - 1),
899 * because actually we need the address of the next byte
900 * after rp->end.
901 */
902 aligned_end = (rp->end + PAGE_SIZE) & PAGE_MASK;
903
904 if ((rp->start <= user_paddr) &&
905 (user_paddr + user_size) <= aligned_end)
906 break;
907 }
908
909 if (i > PCI_ROM_RESOURCE)
910 return -EINVAL;
911
912 return 0;
913 }
914
915 /* Set vm_flags of VMA, as appropriate for this architecture, for a pci device
916 * mapping.
917 */
918 static void __pci_mmap_set_flags(struct pci_dev *dev, struct vm_area_struct *vma,
919 enum pci_mmap_state mmap_state)
920 {
921 vma->vm_flags |= (VM_IO | VM_RESERVED);
922 }
923
924 /* Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
925 * device mapping.
926 */
927 static void __pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_area_struct *vma,
928 enum pci_mmap_state mmap_state)
929 {
930 /* Our io_remap_pfn_range takes care of this, do nothing. */
931 }
932
933 /* Perform the actual remap of the pages for a PCI device mapping, as appropriate
934 * for this architecture. The region in the process to map is described by vm_start
935 * and vm_end members of VMA, the base physical address is found in vm_pgoff.
936 * The pci device structure is provided so that architectures may make mapping
937 * decisions on a per-device or per-bus basis.
938 *
939 * Returns a negative error code on failure, zero on success.
940 */
941 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
942 enum pci_mmap_state mmap_state,
943 int write_combine)
944 {
945 int ret;
946
947 ret = __pci_mmap_make_offset(dev, vma, mmap_state);
948 if (ret < 0)
949 return ret;
950
951 __pci_mmap_set_flags(dev, vma, mmap_state);
952 __pci_mmap_set_pgprot(dev, vma, mmap_state);
953
954 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
955 ret = io_remap_pfn_range(vma, vma->vm_start,
956 vma->vm_pgoff,
957 vma->vm_end - vma->vm_start,
958 vma->vm_page_prot);
959 if (ret)
960 return ret;
961
962 return 0;
963 }
964
965 #ifdef CONFIG_NUMA
966 int pcibus_to_node(struct pci_bus *pbus)
967 {
968 struct pci_pbm_info *pbm = pbus->sysdata;
969
970 return pbm->numa_node;
971 }
972 EXPORT_SYMBOL(pcibus_to_node);
973 #endif
974
975 /* Return the domain number for this pci bus */
976
977 int pci_domain_nr(struct pci_bus *pbus)
978 {
979 struct pci_pbm_info *pbm = pbus->sysdata;
980 int ret;
981
982 if (!pbm) {
983 ret = -ENXIO;
984 } else {
985 ret = pbm->index;
986 }
987
988 return ret;
989 }
990 EXPORT_SYMBOL(pci_domain_nr);
991
992 #ifdef CONFIG_PCI_MSI
993 int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
994 {
995 struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
996 unsigned int virt_irq;
997
998 if (!pbm->setup_msi_irq)
999 return -EINVAL;
1000
1001 return pbm->setup_msi_irq(&virt_irq, pdev, desc);
1002 }
1003
1004 void arch_teardown_msi_irq(unsigned int virt_irq)
1005 {
1006 struct msi_desc *entry = get_irq_msi(virt_irq);
1007 struct pci_dev *pdev = entry->dev;
1008 struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
1009
1010 if (pbm->teardown_msi_irq)
1011 pbm->teardown_msi_irq(virt_irq, pdev);
1012 }
1013 #endif /* !(CONFIG_PCI_MSI) */
1014
1015 struct device_node *pci_device_to_OF_node(struct pci_dev *pdev)
1016 {
1017 return pdev->dev.archdata.prom_node;
1018 }
1019 EXPORT_SYMBOL(pci_device_to_OF_node);
1020
1021 static void ali_sound_dma_hack(struct pci_dev *pdev, int set_bit)
1022 {
1023 struct pci_dev *ali_isa_bridge;
1024 u8 val;
1025
1026 /* ALI sound chips generate 31-bits of DMA, a special register
1027 * determines what bit 31 is emitted as.
1028 */
1029 ali_isa_bridge = pci_get_device(PCI_VENDOR_ID_AL,
1030 PCI_DEVICE_ID_AL_M1533,
1031 NULL);
1032
1033 pci_read_config_byte(ali_isa_bridge, 0x7e, &val);
1034 if (set_bit)
1035 val |= 0x01;
1036 else
1037 val &= ~0x01;
1038 pci_write_config_byte(ali_isa_bridge, 0x7e, val);
1039 pci_dev_put(ali_isa_bridge);
1040 }
1041
1042 int pci_dma_supported(struct pci_dev *pdev, u64 device_mask)
1043 {
1044 u64 dma_addr_mask;
1045
1046 if (pdev == NULL) {
1047 dma_addr_mask = 0xffffffff;
1048 } else {
1049 struct iommu *iommu = pdev->dev.archdata.iommu;
1050
1051 dma_addr_mask = iommu->dma_addr_mask;
1052
1053 if (pdev->vendor == PCI_VENDOR_ID_AL &&
1054 pdev->device == PCI_DEVICE_ID_AL_M5451 &&
1055 device_mask == 0x7fffffff) {
1056 ali_sound_dma_hack(pdev,
1057 (dma_addr_mask & 0x80000000) != 0);
1058 return 1;
1059 }
1060 }
1061
1062 if (device_mask >= (1UL << 32UL))
1063 return 0;
1064
1065 return (device_mask & dma_addr_mask) == dma_addr_mask;
1066 }
1067 EXPORT_SYMBOL(pci_dma_supported);
1068
1069 void pci_resource_to_user(const struct pci_dev *pdev, int bar,
1070 const struct resource *rp, resource_size_t *start,
1071 resource_size_t *end)
1072 {
1073 struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
1074 unsigned long offset;
1075
1076 if (rp->flags & IORESOURCE_IO)
1077 offset = pbm->io_space.start;
1078 else
1079 offset = pbm->mem_space.start;
1080
1081 *start = rp->start - offset;
1082 *end = rp->end - offset;
1083 }
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