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d3afa58c MS |
1 | /* |
2 | * Contains common pci routines for ALL ppc platform | |
3 | * (based on pci_32.c and pci_64.c) | |
4 | * | |
5 | * Port for PPC64 David Engebretsen, IBM Corp. | |
6 | * Contains common pci routines for ppc64 platform, pSeries and iSeries brands. | |
7 | * | |
8 | * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM | |
9 | * Rework, based on alpha PCI code. | |
10 | * | |
11 | * Common pmac/prep/chrp pci routines. -- Cort | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or | |
14 | * modify it under the terms of the GNU General Public License | |
15 | * as published by the Free Software Foundation; either version | |
16 | * 2 of the License, or (at your option) any later version. | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/pci.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/bootmem.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/syscalls.h> | |
27 | #include <linux/irq.h> | |
28 | #include <linux/vmalloc.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
f1ca09b2 GL |
30 | #include <linux/of.h> |
31 | #include <linux/of_address.h> | |
04bea68b | 32 | #include <linux/of_pci.h> |
66421a64 | 33 | #include <linux/export.h> |
d3afa58c MS |
34 | |
35 | #include <asm/processor.h> | |
36 | #include <asm/io.h> | |
d3afa58c MS |
37 | #include <asm/pci-bridge.h> |
38 | #include <asm/byteorder.h> | |
39 | ||
40 | static DEFINE_SPINLOCK(hose_spinlock); | |
41 | LIST_HEAD(hose_list); | |
42 | ||
43 | /* XXX kill that some day ... */ | |
44 | static int global_phb_number; /* Global phb counter */ | |
45 | ||
46 | /* ISA Memory physical address */ | |
47 | resource_size_t isa_mem_base; | |
48 | ||
49 | /* Default PCI flags is 0 on ppc32, modified at boot on ppc64 */ | |
50 | unsigned int pci_flags; | |
51 | ||
52 | static struct dma_map_ops *pci_dma_ops = &dma_direct_ops; | |
53 | ||
bf13a6fa BH |
54 | unsigned long isa_io_base; |
55 | unsigned long pci_dram_offset; | |
56 | static int pci_bus_count; | |
57 | ||
58 | ||
d3afa58c MS |
59 | void set_pci_dma_ops(struct dma_map_ops *dma_ops) |
60 | { | |
61 | pci_dma_ops = dma_ops; | |
62 | } | |
63 | ||
64 | struct dma_map_ops *get_pci_dma_ops(void) | |
65 | { | |
66 | return pci_dma_ops; | |
67 | } | |
68 | EXPORT_SYMBOL(get_pci_dma_ops); | |
69 | ||
d3afa58c MS |
70 | struct pci_controller *pcibios_alloc_controller(struct device_node *dev) |
71 | { | |
72 | struct pci_controller *phb; | |
73 | ||
74 | phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL); | |
75 | if (!phb) | |
76 | return NULL; | |
77 | spin_lock(&hose_spinlock); | |
78 | phb->global_number = global_phb_number++; | |
79 | list_add_tail(&phb->list_node, &hose_list); | |
80 | spin_unlock(&hose_spinlock); | |
81 | phb->dn = dev; | |
82 | phb->is_dynamic = mem_init_done; | |
83 | return phb; | |
84 | } | |
85 | ||
86 | void pcibios_free_controller(struct pci_controller *phb) | |
87 | { | |
88 | spin_lock(&hose_spinlock); | |
89 | list_del(&phb->list_node); | |
90 | spin_unlock(&hose_spinlock); | |
91 | ||
92 | if (phb->is_dynamic) | |
93 | kfree(phb); | |
94 | } | |
95 | ||
96 | static resource_size_t pcibios_io_size(const struct pci_controller *hose) | |
97 | { | |
28f65c11 | 98 | return resource_size(&hose->io_resource); |
d3afa58c MS |
99 | } |
100 | ||
101 | int pcibios_vaddr_is_ioport(void __iomem *address) | |
102 | { | |
103 | int ret = 0; | |
104 | struct pci_controller *hose; | |
105 | resource_size_t size; | |
106 | ||
107 | spin_lock(&hose_spinlock); | |
108 | list_for_each_entry(hose, &hose_list, list_node) { | |
109 | size = pcibios_io_size(hose); | |
110 | if (address >= hose->io_base_virt && | |
111 | address < (hose->io_base_virt + size)) { | |
112 | ret = 1; | |
113 | break; | |
114 | } | |
115 | } | |
116 | spin_unlock(&hose_spinlock); | |
117 | return ret; | |
118 | } | |
119 | ||
120 | unsigned long pci_address_to_pio(phys_addr_t address) | |
121 | { | |
122 | struct pci_controller *hose; | |
123 | resource_size_t size; | |
124 | unsigned long ret = ~0; | |
125 | ||
126 | spin_lock(&hose_spinlock); | |
127 | list_for_each_entry(hose, &hose_list, list_node) { | |
128 | size = pcibios_io_size(hose); | |
129 | if (address >= hose->io_base_phys && | |
130 | address < (hose->io_base_phys + size)) { | |
131 | unsigned long base = | |
132 | (unsigned long)hose->io_base_virt - _IO_BASE; | |
133 | ret = base + (address - hose->io_base_phys); | |
134 | break; | |
135 | } | |
136 | } | |
137 | spin_unlock(&hose_spinlock); | |
138 | ||
139 | return ret; | |
140 | } | |
141 | EXPORT_SYMBOL_GPL(pci_address_to_pio); | |
142 | ||
143 | /* | |
144 | * Return the domain number for this bus. | |
145 | */ | |
146 | int pci_domain_nr(struct pci_bus *bus) | |
147 | { | |
148 | struct pci_controller *hose = pci_bus_to_host(bus); | |
149 | ||
150 | return hose->global_number; | |
151 | } | |
152 | EXPORT_SYMBOL(pci_domain_nr); | |
153 | ||
154 | /* This routine is meant to be used early during boot, when the | |
155 | * PCI bus numbers have not yet been assigned, and you need to | |
156 | * issue PCI config cycles to an OF device. | |
157 | * It could also be used to "fix" RTAS config cycles if you want | |
158 | * to set pci_assign_all_buses to 1 and still use RTAS for PCI | |
159 | * config cycles. | |
160 | */ | |
161 | struct pci_controller *pci_find_hose_for_OF_device(struct device_node *node) | |
162 | { | |
163 | while (node) { | |
164 | struct pci_controller *hose, *tmp; | |
165 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) | |
166 | if (hose->dn == node) | |
167 | return hose; | |
168 | node = node->parent; | |
169 | } | |
170 | return NULL; | |
171 | } | |
172 | ||
173 | static ssize_t pci_show_devspec(struct device *dev, | |
174 | struct device_attribute *attr, char *buf) | |
175 | { | |
176 | struct pci_dev *pdev; | |
177 | struct device_node *np; | |
178 | ||
179 | pdev = to_pci_dev(dev); | |
180 | np = pci_device_to_OF_node(pdev); | |
181 | if (np == NULL || np->full_name == NULL) | |
182 | return 0; | |
183 | return sprintf(buf, "%s", np->full_name); | |
184 | } | |
185 | static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL); | |
186 | ||
187 | /* Add sysfs properties */ | |
188 | int pcibios_add_platform_entries(struct pci_dev *pdev) | |
189 | { | |
190 | return device_create_file(&pdev->dev, &dev_attr_devspec); | |
191 | } | |
192 | ||
b51d4a3e MS |
193 | void pcibios_set_master(struct pci_dev *dev) |
194 | { | |
195 | /* No special bus mastering setup handling */ | |
196 | } | |
197 | ||
d3afa58c MS |
198 | char __devinit *pcibios_setup(char *str) |
199 | { | |
200 | return str; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Reads the interrupt pin to determine if interrupt is use by card. | |
205 | * If the interrupt is used, then gets the interrupt line from the | |
206 | * openfirmware and sets it in the pci_dev and pci_config line. | |
207 | */ | |
208 | int pci_read_irq_line(struct pci_dev *pci_dev) | |
209 | { | |
210 | struct of_irq oirq; | |
211 | unsigned int virq; | |
212 | ||
213 | /* The current device-tree that iSeries generates from the HV | |
214 | * PCI informations doesn't contain proper interrupt routing, | |
215 | * and all the fallback would do is print out crap, so we | |
216 | * don't attempt to resolve the interrupts here at all, some | |
217 | * iSeries specific fixup does it. | |
218 | * | |
219 | * In the long run, we will hopefully fix the generated device-tree | |
220 | * instead. | |
221 | */ | |
222 | pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev)); | |
223 | ||
224 | #ifdef DEBUG | |
225 | memset(&oirq, 0xff, sizeof(oirq)); | |
226 | #endif | |
227 | /* Try to get a mapping from the device-tree */ | |
228 | if (of_irq_map_pci(pci_dev, &oirq)) { | |
229 | u8 line, pin; | |
230 | ||
231 | /* If that fails, lets fallback to what is in the config | |
232 | * space and map that through the default controller. We | |
233 | * also set the type to level low since that's what PCI | |
234 | * interrupts are. If your platform does differently, then | |
235 | * either provide a proper interrupt tree or don't use this | |
236 | * function. | |
237 | */ | |
238 | if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin)) | |
239 | return -1; | |
240 | if (pin == 0) | |
241 | return -1; | |
242 | if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) || | |
243 | line == 0xff || line == 0) { | |
244 | return -1; | |
245 | } | |
246 | pr_debug(" No map ! Using line %d (pin %d) from PCI config\n", | |
247 | line, pin); | |
248 | ||
249 | virq = irq_create_mapping(NULL, line); | |
250 | if (virq != NO_IRQ) | |
4adc192e | 251 | irq_set_irq_type(virq, IRQ_TYPE_LEVEL_LOW); |
d3afa58c MS |
252 | } else { |
253 | pr_debug(" Got one, spec %d cells (0x%08x 0x%08x...) on %s\n", | |
254 | oirq.size, oirq.specifier[0], oirq.specifier[1], | |
255 | oirq.controller ? oirq.controller->full_name : | |
256 | "<default>"); | |
257 | ||
258 | virq = irq_create_of_mapping(oirq.controller, oirq.specifier, | |
259 | oirq.size); | |
260 | } | |
261 | if (virq == NO_IRQ) { | |
262 | pr_debug(" Failed to map !\n"); | |
263 | return -1; | |
264 | } | |
265 | ||
266 | pr_debug(" Mapped to linux irq %d\n", virq); | |
267 | ||
268 | pci_dev->irq = virq; | |
269 | ||
270 | return 0; | |
271 | } | |
272 | EXPORT_SYMBOL(pci_read_irq_line); | |
273 | ||
274 | /* | |
275 | * Platform support for /proc/bus/pci/X/Y mmap()s, | |
276 | * modelled on the sparc64 implementation by Dave Miller. | |
277 | * -- paulus. | |
278 | */ | |
279 | ||
280 | /* | |
281 | * Adjust vm_pgoff of VMA such that it is the physical page offset | |
282 | * corresponding to the 32-bit pci bus offset for DEV requested by the user. | |
283 | * | |
284 | * Basically, the user finds the base address for his device which he wishes | |
285 | * to mmap. They read the 32-bit value from the config space base register, | |
286 | * add whatever PAGE_SIZE multiple offset they wish, and feed this into the | |
287 | * offset parameter of mmap on /proc/bus/pci/XXX for that device. | |
288 | * | |
289 | * Returns negative error code on failure, zero on success. | |
290 | */ | |
291 | static struct resource *__pci_mmap_make_offset(struct pci_dev *dev, | |
292 | resource_size_t *offset, | |
293 | enum pci_mmap_state mmap_state) | |
294 | { | |
295 | struct pci_controller *hose = pci_bus_to_host(dev->bus); | |
296 | unsigned long io_offset = 0; | |
297 | int i, res_bit; | |
298 | ||
299 | if (hose == 0) | |
300 | return NULL; /* should never happen */ | |
301 | ||
302 | /* If memory, add on the PCI bridge address offset */ | |
303 | if (mmap_state == pci_mmap_mem) { | |
304 | #if 0 /* See comment in pci_resource_to_user() for why this is disabled */ | |
305 | *offset += hose->pci_mem_offset; | |
306 | #endif | |
307 | res_bit = IORESOURCE_MEM; | |
308 | } else { | |
309 | io_offset = (unsigned long)hose->io_base_virt - _IO_BASE; | |
310 | *offset += io_offset; | |
311 | res_bit = IORESOURCE_IO; | |
312 | } | |
313 | ||
314 | /* | |
315 | * Check that the offset requested corresponds to one of the | |
316 | * resources of the device. | |
317 | */ | |
318 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) { | |
319 | struct resource *rp = &dev->resource[i]; | |
320 | int flags = rp->flags; | |
321 | ||
322 | /* treat ROM as memory (should be already) */ | |
323 | if (i == PCI_ROM_RESOURCE) | |
324 | flags |= IORESOURCE_MEM; | |
325 | ||
326 | /* Active and same type? */ | |
327 | if ((flags & res_bit) == 0) | |
328 | continue; | |
329 | ||
330 | /* In the range of this resource? */ | |
331 | if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end) | |
332 | continue; | |
333 | ||
334 | /* found it! construct the final physical address */ | |
335 | if (mmap_state == pci_mmap_io) | |
336 | *offset += hose->io_base_phys - io_offset; | |
337 | return rp; | |
338 | } | |
339 | ||
340 | return NULL; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci | |
345 | * device mapping. | |
346 | */ | |
347 | static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp, | |
348 | pgprot_t protection, | |
349 | enum pci_mmap_state mmap_state, | |
350 | int write_combine) | |
351 | { | |
352 | pgprot_t prot = protection; | |
353 | ||
354 | /* Write combine is always 0 on non-memory space mappings. On | |
355 | * memory space, if the user didn't pass 1, we check for a | |
356 | * "prefetchable" resource. This is a bit hackish, but we use | |
357 | * this to workaround the inability of /sysfs to provide a write | |
358 | * combine bit | |
359 | */ | |
360 | if (mmap_state != pci_mmap_mem) | |
361 | write_combine = 0; | |
362 | else if (write_combine == 0) { | |
363 | if (rp->flags & IORESOURCE_PREFETCH) | |
364 | write_combine = 1; | |
365 | } | |
366 | ||
367 | return pgprot_noncached(prot); | |
368 | } | |
369 | ||
370 | /* | |
371 | * This one is used by /dev/mem and fbdev who have no clue about the | |
372 | * PCI device, it tries to find the PCI device first and calls the | |
373 | * above routine | |
374 | */ | |
375 | pgprot_t pci_phys_mem_access_prot(struct file *file, | |
376 | unsigned long pfn, | |
377 | unsigned long size, | |
378 | pgprot_t prot) | |
379 | { | |
380 | struct pci_dev *pdev = NULL; | |
381 | struct resource *found = NULL; | |
382 | resource_size_t offset = ((resource_size_t)pfn) << PAGE_SHIFT; | |
383 | int i; | |
384 | ||
385 | if (page_is_ram(pfn)) | |
386 | return prot; | |
387 | ||
388 | prot = pgprot_noncached(prot); | |
389 | for_each_pci_dev(pdev) { | |
390 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) { | |
391 | struct resource *rp = &pdev->resource[i]; | |
392 | int flags = rp->flags; | |
393 | ||
394 | /* Active and same type? */ | |
395 | if ((flags & IORESOURCE_MEM) == 0) | |
396 | continue; | |
397 | /* In the range of this resource? */ | |
398 | if (offset < (rp->start & PAGE_MASK) || | |
399 | offset > rp->end) | |
400 | continue; | |
401 | found = rp; | |
402 | break; | |
403 | } | |
404 | if (found) | |
405 | break; | |
406 | } | |
407 | if (found) { | |
408 | if (found->flags & IORESOURCE_PREFETCH) | |
409 | prot = pgprot_noncached_wc(prot); | |
410 | pci_dev_put(pdev); | |
411 | } | |
412 | ||
413 | pr_debug("PCI: Non-PCI map for %llx, prot: %lx\n", | |
414 | (unsigned long long)offset, pgprot_val(prot)); | |
415 | ||
416 | return prot; | |
417 | } | |
418 | ||
419 | /* | |
420 | * Perform the actual remap of the pages for a PCI device mapping, as | |
421 | * appropriate for this architecture. The region in the process to map | |
422 | * is described by vm_start and vm_end members of VMA, the base physical | |
423 | * address is found in vm_pgoff. | |
424 | * The pci device structure is provided so that architectures may make mapping | |
425 | * decisions on a per-device or per-bus basis. | |
426 | * | |
427 | * Returns a negative error code on failure, zero on success. | |
428 | */ | |
429 | int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, | |
430 | enum pci_mmap_state mmap_state, int write_combine) | |
431 | { | |
432 | resource_size_t offset = | |
433 | ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT; | |
434 | struct resource *rp; | |
435 | int ret; | |
436 | ||
437 | rp = __pci_mmap_make_offset(dev, &offset, mmap_state); | |
438 | if (rp == NULL) | |
439 | return -EINVAL; | |
440 | ||
441 | vma->vm_pgoff = offset >> PAGE_SHIFT; | |
442 | vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp, | |
443 | vma->vm_page_prot, | |
444 | mmap_state, write_combine); | |
445 | ||
446 | ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, | |
447 | vma->vm_end - vma->vm_start, vma->vm_page_prot); | |
448 | ||
449 | return ret; | |
450 | } | |
451 | ||
452 | /* This provides legacy IO read access on a bus */ | |
453 | int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size) | |
454 | { | |
455 | unsigned long offset; | |
456 | struct pci_controller *hose = pci_bus_to_host(bus); | |
457 | struct resource *rp = &hose->io_resource; | |
458 | void __iomem *addr; | |
459 | ||
460 | /* Check if port can be supported by that bus. We only check | |
461 | * the ranges of the PHB though, not the bus itself as the rules | |
462 | * for forwarding legacy cycles down bridges are not our problem | |
463 | * here. So if the host bridge supports it, we do it. | |
464 | */ | |
465 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; | |
466 | offset += port; | |
467 | ||
468 | if (!(rp->flags & IORESOURCE_IO)) | |
469 | return -ENXIO; | |
470 | if (offset < rp->start || (offset + size) > rp->end) | |
471 | return -ENXIO; | |
472 | addr = hose->io_base_virt + port; | |
473 | ||
474 | switch (size) { | |
475 | case 1: | |
476 | *((u8 *)val) = in_8(addr); | |
477 | return 1; | |
478 | case 2: | |
479 | if (port & 1) | |
480 | return -EINVAL; | |
481 | *((u16 *)val) = in_le16(addr); | |
482 | return 2; | |
483 | case 4: | |
484 | if (port & 3) | |
485 | return -EINVAL; | |
486 | *((u32 *)val) = in_le32(addr); | |
487 | return 4; | |
488 | } | |
489 | return -EINVAL; | |
490 | } | |
491 | ||
492 | /* This provides legacy IO write access on a bus */ | |
493 | int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size) | |
494 | { | |
495 | unsigned long offset; | |
496 | struct pci_controller *hose = pci_bus_to_host(bus); | |
497 | struct resource *rp = &hose->io_resource; | |
498 | void __iomem *addr; | |
499 | ||
500 | /* Check if port can be supported by that bus. We only check | |
501 | * the ranges of the PHB though, not the bus itself as the rules | |
502 | * for forwarding legacy cycles down bridges are not our problem | |
503 | * here. So if the host bridge supports it, we do it. | |
504 | */ | |
505 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; | |
506 | offset += port; | |
507 | ||
508 | if (!(rp->flags & IORESOURCE_IO)) | |
509 | return -ENXIO; | |
510 | if (offset < rp->start || (offset + size) > rp->end) | |
511 | return -ENXIO; | |
512 | addr = hose->io_base_virt + port; | |
513 | ||
514 | /* WARNING: The generic code is idiotic. It gets passed a pointer | |
515 | * to what can be a 1, 2 or 4 byte quantity and always reads that | |
516 | * as a u32, which means that we have to correct the location of | |
517 | * the data read within those 32 bits for size 1 and 2 | |
518 | */ | |
519 | switch (size) { | |
520 | case 1: | |
521 | out_8(addr, val >> 24); | |
522 | return 1; | |
523 | case 2: | |
524 | if (port & 1) | |
525 | return -EINVAL; | |
526 | out_le16(addr, val >> 16); | |
527 | return 2; | |
528 | case 4: | |
529 | if (port & 3) | |
530 | return -EINVAL; | |
531 | out_le32(addr, val); | |
532 | return 4; | |
533 | } | |
534 | return -EINVAL; | |
535 | } | |
536 | ||
537 | /* This provides legacy IO or memory mmap access on a bus */ | |
538 | int pci_mmap_legacy_page_range(struct pci_bus *bus, | |
539 | struct vm_area_struct *vma, | |
540 | enum pci_mmap_state mmap_state) | |
541 | { | |
542 | struct pci_controller *hose = pci_bus_to_host(bus); | |
543 | resource_size_t offset = | |
544 | ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT; | |
545 | resource_size_t size = vma->vm_end - vma->vm_start; | |
546 | struct resource *rp; | |
547 | ||
548 | pr_debug("pci_mmap_legacy_page_range(%04x:%02x, %s @%llx..%llx)\n", | |
549 | pci_domain_nr(bus), bus->number, | |
550 | mmap_state == pci_mmap_mem ? "MEM" : "IO", | |
551 | (unsigned long long)offset, | |
552 | (unsigned long long)(offset + size - 1)); | |
553 | ||
554 | if (mmap_state == pci_mmap_mem) { | |
555 | /* Hack alert ! | |
556 | * | |
557 | * Because X is lame and can fail starting if it gets an error | |
558 | * trying to mmap legacy_mem (instead of just moving on without | |
559 | * legacy memory access) we fake it here by giving it anonymous | |
560 | * memory, effectively behaving just like /dev/zero | |
561 | */ | |
562 | if ((offset + size) > hose->isa_mem_size) { | |
79bf3a13 | 563 | #ifdef CONFIG_MMU |
d3afa58c MS |
564 | printk(KERN_DEBUG |
565 | "Process %s (pid:%d) mapped non-existing PCI" | |
566 | "legacy memory for 0%04x:%02x\n", | |
567 | current->comm, current->pid, pci_domain_nr(bus), | |
568 | bus->number); | |
79bf3a13 | 569 | #endif |
d3afa58c MS |
570 | if (vma->vm_flags & VM_SHARED) |
571 | return shmem_zero_setup(vma); | |
572 | return 0; | |
573 | } | |
574 | offset += hose->isa_mem_phys; | |
575 | } else { | |
576 | unsigned long io_offset = (unsigned long)hose->io_base_virt - \ | |
577 | _IO_BASE; | |
578 | unsigned long roffset = offset + io_offset; | |
579 | rp = &hose->io_resource; | |
580 | if (!(rp->flags & IORESOURCE_IO)) | |
581 | return -ENXIO; | |
582 | if (roffset < rp->start || (roffset + size) > rp->end) | |
583 | return -ENXIO; | |
584 | offset += hose->io_base_phys; | |
585 | } | |
586 | pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset); | |
587 | ||
588 | vma->vm_pgoff = offset >> PAGE_SHIFT; | |
589 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
590 | return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, | |
591 | vma->vm_end - vma->vm_start, | |
592 | vma->vm_page_prot); | |
593 | } | |
594 | ||
595 | void pci_resource_to_user(const struct pci_dev *dev, int bar, | |
596 | const struct resource *rsrc, | |
597 | resource_size_t *start, resource_size_t *end) | |
598 | { | |
599 | struct pci_controller *hose = pci_bus_to_host(dev->bus); | |
600 | resource_size_t offset = 0; | |
601 | ||
602 | if (hose == NULL) | |
603 | return; | |
604 | ||
605 | if (rsrc->flags & IORESOURCE_IO) | |
606 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; | |
607 | ||
608 | /* We pass a fully fixed up address to userland for MMIO instead of | |
609 | * a BAR value because X is lame and expects to be able to use that | |
610 | * to pass to /dev/mem ! | |
611 | * | |
612 | * That means that we'll have potentially 64 bits values where some | |
613 | * userland apps only expect 32 (like X itself since it thinks only | |
614 | * Sparc has 64 bits MMIO) but if we don't do that, we break it on | |
615 | * 32 bits CHRPs :-( | |
616 | * | |
617 | * Hopefully, the sysfs insterface is immune to that gunk. Once X | |
618 | * has been fixed (and the fix spread enough), we can re-enable the | |
619 | * 2 lines below and pass down a BAR value to userland. In that case | |
620 | * we'll also have to re-enable the matching code in | |
621 | * __pci_mmap_make_offset(). | |
622 | * | |
623 | * BenH. | |
624 | */ | |
625 | #if 0 | |
626 | else if (rsrc->flags & IORESOURCE_MEM) | |
627 | offset = hose->pci_mem_offset; | |
628 | #endif | |
629 | ||
630 | *start = rsrc->start - offset; | |
631 | *end = rsrc->end - offset; | |
632 | } | |
633 | ||
634 | /** | |
635 | * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree | |
636 | * @hose: newly allocated pci_controller to be setup | |
637 | * @dev: device node of the host bridge | |
638 | * @primary: set if primary bus (32 bits only, soon to be deprecated) | |
639 | * | |
640 | * This function will parse the "ranges" property of a PCI host bridge device | |
641 | * node and setup the resource mapping of a pci controller based on its | |
642 | * content. | |
643 | * | |
644 | * Life would be boring if it wasn't for a few issues that we have to deal | |
645 | * with here: | |
646 | * | |
647 | * - We can only cope with one IO space range and up to 3 Memory space | |
648 | * ranges. However, some machines (thanks Apple !) tend to split their | |
649 | * space into lots of small contiguous ranges. So we have to coalesce. | |
650 | * | |
651 | * - We can only cope with all memory ranges having the same offset | |
652 | * between CPU addresses and PCI addresses. Unfortunately, some bridges | |
653 | * are setup for a large 1:1 mapping along with a small "window" which | |
654 | * maps PCI address 0 to some arbitrary high address of the CPU space in | |
655 | * order to give access to the ISA memory hole. | |
656 | * The way out of here that I've chosen for now is to always set the | |
657 | * offset based on the first resource found, then override it if we | |
658 | * have a different offset and the previous was set by an ISA hole. | |
659 | * | |
660 | * - Some busses have IO space not starting at 0, which causes trouble with | |
661 | * the way we do our IO resource renumbering. The code somewhat deals with | |
662 | * it for 64 bits but I would expect problems on 32 bits. | |
663 | * | |
664 | * - Some 32 bits platforms such as 4xx can have physical space larger than | |
665 | * 32 bits so we need to use 64 bits values for the parsing | |
666 | */ | |
667 | void __devinit pci_process_bridge_OF_ranges(struct pci_controller *hose, | |
668 | struct device_node *dev, | |
669 | int primary) | |
670 | { | |
671 | const u32 *ranges; | |
672 | int rlen; | |
673 | int pna = of_n_addr_cells(dev); | |
674 | int np = pna + 5; | |
675 | int memno = 0, isa_hole = -1; | |
676 | u32 pci_space; | |
677 | unsigned long long pci_addr, cpu_addr, pci_next, cpu_next, size; | |
678 | unsigned long long isa_mb = 0; | |
679 | struct resource *res; | |
680 | ||
681 | printk(KERN_INFO "PCI host bridge %s %s ranges:\n", | |
682 | dev->full_name, primary ? "(primary)" : ""); | |
683 | ||
684 | /* Get ranges property */ | |
685 | ranges = of_get_property(dev, "ranges", &rlen); | |
686 | if (ranges == NULL) | |
687 | return; | |
688 | ||
689 | /* Parse it */ | |
690 | pr_debug("Parsing ranges property...\n"); | |
691 | while ((rlen -= np * 4) >= 0) { | |
692 | /* Read next ranges element */ | |
693 | pci_space = ranges[0]; | |
694 | pci_addr = of_read_number(ranges + 1, 2); | |
695 | cpu_addr = of_translate_address(dev, ranges + 3); | |
696 | size = of_read_number(ranges + pna + 3, 2); | |
697 | ||
698 | pr_debug("pci_space: 0x%08x pci_addr:0x%016llx " | |
699 | "cpu_addr:0x%016llx size:0x%016llx\n", | |
700 | pci_space, pci_addr, cpu_addr, size); | |
701 | ||
702 | ranges += np; | |
703 | ||
704 | /* If we failed translation or got a zero-sized region | |
705 | * (some FW try to feed us with non sensical zero sized regions | |
706 | * such as power3 which look like some kind of attempt | |
707 | * at exposing the VGA memory hole) | |
708 | */ | |
709 | if (cpu_addr == OF_BAD_ADDR || size == 0) | |
710 | continue; | |
711 | ||
712 | /* Now consume following elements while they are contiguous */ | |
713 | for (; rlen >= np * sizeof(u32); | |
714 | ranges += np, rlen -= np * 4) { | |
715 | if (ranges[0] != pci_space) | |
716 | break; | |
717 | pci_next = of_read_number(ranges + 1, 2); | |
718 | cpu_next = of_translate_address(dev, ranges + 3); | |
719 | if (pci_next != pci_addr + size || | |
720 | cpu_next != cpu_addr + size) | |
721 | break; | |
722 | size += of_read_number(ranges + pna + 3, 2); | |
723 | } | |
724 | ||
725 | /* Act based on address space type */ | |
726 | res = NULL; | |
727 | switch ((pci_space >> 24) & 0x3) { | |
728 | case 1: /* PCI IO space */ | |
729 | printk(KERN_INFO | |
730 | " IO 0x%016llx..0x%016llx -> 0x%016llx\n", | |
731 | cpu_addr, cpu_addr + size - 1, pci_addr); | |
732 | ||
733 | /* We support only one IO range */ | |
734 | if (hose->pci_io_size) { | |
735 | printk(KERN_INFO | |
736 | " \\--> Skipped (too many) !\n"); | |
737 | continue; | |
738 | } | |
739 | /* On 32 bits, limit I/O space to 16MB */ | |
740 | if (size > 0x01000000) | |
741 | size = 0x01000000; | |
742 | ||
743 | /* 32 bits needs to map IOs here */ | |
744 | hose->io_base_virt = ioremap(cpu_addr, size); | |
745 | ||
746 | /* Expect trouble if pci_addr is not 0 */ | |
747 | if (primary) | |
748 | isa_io_base = | |
749 | (unsigned long)hose->io_base_virt; | |
750 | /* pci_io_size and io_base_phys always represent IO | |
751 | * space starting at 0 so we factor in pci_addr | |
752 | */ | |
753 | hose->pci_io_size = pci_addr + size; | |
754 | hose->io_base_phys = cpu_addr - pci_addr; | |
755 | ||
756 | /* Build resource */ | |
757 | res = &hose->io_resource; | |
758 | res->flags = IORESOURCE_IO; | |
759 | res->start = pci_addr; | |
760 | break; | |
761 | case 2: /* PCI Memory space */ | |
762 | case 3: /* PCI 64 bits Memory space */ | |
763 | printk(KERN_INFO | |
764 | " MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n", | |
765 | cpu_addr, cpu_addr + size - 1, pci_addr, | |
766 | (pci_space & 0x40000000) ? "Prefetch" : ""); | |
767 | ||
768 | /* We support only 3 memory ranges */ | |
769 | if (memno >= 3) { | |
770 | printk(KERN_INFO | |
771 | " \\--> Skipped (too many) !\n"); | |
772 | continue; | |
773 | } | |
774 | /* Handles ISA memory hole space here */ | |
775 | if (pci_addr == 0) { | |
776 | isa_mb = cpu_addr; | |
777 | isa_hole = memno; | |
778 | if (primary || isa_mem_base == 0) | |
779 | isa_mem_base = cpu_addr; | |
780 | hose->isa_mem_phys = cpu_addr; | |
781 | hose->isa_mem_size = size; | |
782 | } | |
783 | ||
784 | /* We get the PCI/Mem offset from the first range or | |
785 | * the, current one if the offset came from an ISA | |
786 | * hole. If they don't match, bugger. | |
787 | */ | |
788 | if (memno == 0 || | |
789 | (isa_hole >= 0 && pci_addr != 0 && | |
790 | hose->pci_mem_offset == isa_mb)) | |
791 | hose->pci_mem_offset = cpu_addr - pci_addr; | |
792 | else if (pci_addr != 0 && | |
793 | hose->pci_mem_offset != cpu_addr - pci_addr) { | |
794 | printk(KERN_INFO | |
795 | " \\--> Skipped (offset mismatch) !\n"); | |
796 | continue; | |
797 | } | |
798 | ||
799 | /* Build resource */ | |
800 | res = &hose->mem_resources[memno++]; | |
801 | res->flags = IORESOURCE_MEM; | |
802 | if (pci_space & 0x40000000) | |
803 | res->flags |= IORESOURCE_PREFETCH; | |
804 | res->start = cpu_addr; | |
805 | break; | |
806 | } | |
807 | if (res != NULL) { | |
808 | res->name = dev->full_name; | |
809 | res->end = res->start + size - 1; | |
810 | res->parent = NULL; | |
811 | res->sibling = NULL; | |
812 | res->child = NULL; | |
813 | } | |
814 | } | |
815 | ||
816 | /* If there's an ISA hole and the pci_mem_offset is -not- matching | |
817 | * the ISA hole offset, then we need to remove the ISA hole from | |
818 | * the resource list for that brige | |
819 | */ | |
820 | if (isa_hole >= 0 && hose->pci_mem_offset != isa_mb) { | |
821 | unsigned int next = isa_hole + 1; | |
822 | printk(KERN_INFO " Removing ISA hole at 0x%016llx\n", isa_mb); | |
823 | if (next < memno) | |
824 | memmove(&hose->mem_resources[isa_hole], | |
825 | &hose->mem_resources[next], | |
826 | sizeof(struct resource) * (memno - next)); | |
827 | hose->mem_resources[--memno].flags = 0; | |
828 | } | |
829 | } | |
830 | ||
831 | /* Decide whether to display the domain number in /proc */ | |
832 | int pci_proc_domain(struct pci_bus *bus) | |
833 | { | |
834 | struct pci_controller *hose = pci_bus_to_host(bus); | |
835 | ||
836 | if (!(pci_flags & PCI_ENABLE_PROC_DOMAINS)) | |
837 | return 0; | |
838 | if (pci_flags & PCI_COMPAT_DOMAIN_0) | |
839 | return hose->global_number != 0; | |
840 | return 1; | |
841 | } | |
842 | ||
843 | void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region, | |
844 | struct resource *res) | |
845 | { | |
846 | resource_size_t offset = 0, mask = (resource_size_t)-1; | |
847 | struct pci_controller *hose = pci_bus_to_host(dev->bus); | |
848 | ||
849 | if (!hose) | |
850 | return; | |
851 | if (res->flags & IORESOURCE_IO) { | |
852 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; | |
853 | mask = 0xffffffffu; | |
854 | } else if (res->flags & IORESOURCE_MEM) | |
855 | offset = hose->pci_mem_offset; | |
856 | ||
857 | region->start = (res->start - offset) & mask; | |
858 | region->end = (res->end - offset) & mask; | |
859 | } | |
860 | EXPORT_SYMBOL(pcibios_resource_to_bus); | |
861 | ||
862 | void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res, | |
863 | struct pci_bus_region *region) | |
864 | { | |
865 | resource_size_t offset = 0, mask = (resource_size_t)-1; | |
866 | struct pci_controller *hose = pci_bus_to_host(dev->bus); | |
867 | ||
868 | if (!hose) | |
869 | return; | |
870 | if (res->flags & IORESOURCE_IO) { | |
871 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; | |
872 | mask = 0xffffffffu; | |
873 | } else if (res->flags & IORESOURCE_MEM) | |
874 | offset = hose->pci_mem_offset; | |
875 | res->start = (region->start + offset) & mask; | |
876 | res->end = (region->end + offset) & mask; | |
877 | } | |
878 | EXPORT_SYMBOL(pcibios_bus_to_resource); | |
879 | ||
880 | /* Fixup a bus resource into a linux resource */ | |
881 | static void __devinit fixup_resource(struct resource *res, struct pci_dev *dev) | |
882 | { | |
883 | struct pci_controller *hose = pci_bus_to_host(dev->bus); | |
884 | resource_size_t offset = 0, mask = (resource_size_t)-1; | |
885 | ||
886 | if (res->flags & IORESOURCE_IO) { | |
887 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; | |
888 | mask = 0xffffffffu; | |
889 | } else if (res->flags & IORESOURCE_MEM) | |
890 | offset = hose->pci_mem_offset; | |
891 | ||
892 | res->start = (res->start + offset) & mask; | |
893 | res->end = (res->end + offset) & mask; | |
894 | } | |
895 | ||
896 | /* This header fixup will do the resource fixup for all devices as they are | |
897 | * probed, but not for bridge ranges | |
898 | */ | |
899 | static void __devinit pcibios_fixup_resources(struct pci_dev *dev) | |
900 | { | |
901 | struct pci_controller *hose = pci_bus_to_host(dev->bus); | |
902 | int i; | |
903 | ||
904 | if (!hose) { | |
905 | printk(KERN_ERR "No host bridge for PCI dev %s !\n", | |
906 | pci_name(dev)); | |
907 | return; | |
908 | } | |
909 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { | |
910 | struct resource *res = dev->resource + i; | |
911 | if (!res->flags) | |
912 | continue; | |
913 | /* On platforms that have PCI_PROBE_ONLY set, we don't | |
914 | * consider 0 as an unassigned BAR value. It's technically | |
915 | * a valid value, but linux doesn't like it... so when we can | |
916 | * re-assign things, we do so, but if we can't, we keep it | |
917 | * around and hope for the best... | |
918 | */ | |
919 | if (res->start == 0 && !(pci_flags & PCI_PROBE_ONLY)) { | |
920 | pr_debug("PCI:%s Resource %d %016llx-%016llx [%x]" \ | |
921 | "is unassigned\n", | |
922 | pci_name(dev), i, | |
923 | (unsigned long long)res->start, | |
924 | (unsigned long long)res->end, | |
925 | (unsigned int)res->flags); | |
926 | res->end -= res->start; | |
927 | res->start = 0; | |
928 | res->flags |= IORESOURCE_UNSET; | |
929 | continue; | |
930 | } | |
931 | ||
932 | pr_debug("PCI:%s Resource %d %016llx-%016llx [%x] fixup...\n", | |
933 | pci_name(dev), i, | |
934 | (unsigned long long)res->start,\ | |
935 | (unsigned long long)res->end, | |
936 | (unsigned int)res->flags); | |
937 | ||
938 | fixup_resource(res, dev); | |
939 | ||
940 | pr_debug("PCI:%s %016llx-%016llx\n", | |
941 | pci_name(dev), | |
942 | (unsigned long long)res->start, | |
943 | (unsigned long long)res->end); | |
944 | } | |
945 | } | |
946 | DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources); | |
947 | ||
948 | /* This function tries to figure out if a bridge resource has been initialized | |
949 | * by the firmware or not. It doesn't have to be absolutely bullet proof, but | |
950 | * things go more smoothly when it gets it right. It should covers cases such | |
951 | * as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges | |
952 | */ | |
953 | static int __devinit pcibios_uninitialized_bridge_resource(struct pci_bus *bus, | |
954 | struct resource *res) | |
955 | { | |
956 | struct pci_controller *hose = pci_bus_to_host(bus); | |
957 | struct pci_dev *dev = bus->self; | |
958 | resource_size_t offset; | |
959 | u16 command; | |
960 | int i; | |
961 | ||
962 | /* We don't do anything if PCI_PROBE_ONLY is set */ | |
963 | if (pci_flags & PCI_PROBE_ONLY) | |
964 | return 0; | |
965 | ||
966 | /* Job is a bit different between memory and IO */ | |
967 | if (res->flags & IORESOURCE_MEM) { | |
968 | /* If the BAR is non-0 (res != pci_mem_offset) then it's | |
969 | * probably been initialized by somebody | |
970 | */ | |
971 | if (res->start != hose->pci_mem_offset) | |
972 | return 0; | |
973 | ||
974 | /* The BAR is 0, let's check if memory decoding is enabled on | |
975 | * the bridge. If not, we consider it unassigned | |
976 | */ | |
977 | pci_read_config_word(dev, PCI_COMMAND, &command); | |
978 | if ((command & PCI_COMMAND_MEMORY) == 0) | |
979 | return 1; | |
980 | ||
981 | /* Memory decoding is enabled and the BAR is 0. If any of | |
982 | * the bridge resources covers that starting address (0 then | |
983 | * it's good enough for us for memory | |
984 | */ | |
985 | for (i = 0; i < 3; i++) { | |
986 | if ((hose->mem_resources[i].flags & IORESOURCE_MEM) && | |
987 | hose->mem_resources[i].start == hose->pci_mem_offset) | |
988 | return 0; | |
989 | } | |
990 | ||
991 | /* Well, it starts at 0 and we know it will collide so we may as | |
992 | * well consider it as unassigned. That covers the Apple case. | |
993 | */ | |
994 | return 1; | |
995 | } else { | |
996 | /* If the BAR is non-0, then we consider it assigned */ | |
997 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; | |
998 | if (((res->start - offset) & 0xfffffffful) != 0) | |
999 | return 0; | |
1000 | ||
1001 | /* Here, we are a bit different than memory as typically IO | |
1002 | * space starting at low addresses -is- valid. What we do | |
1003 | * instead if that we consider as unassigned anything that | |
1004 | * doesn't have IO enabled in the PCI command register, | |
1005 | * and that's it. | |
1006 | */ | |
1007 | pci_read_config_word(dev, PCI_COMMAND, &command); | |
1008 | if (command & PCI_COMMAND_IO) | |
1009 | return 0; | |
1010 | ||
1011 | /* It's starting at 0 and IO is disabled in the bridge, consider | |
1012 | * it unassigned | |
1013 | */ | |
1014 | return 1; | |
1015 | } | |
1016 | } | |
1017 | ||
1018 | /* Fixup resources of a PCI<->PCI bridge */ | |
1019 | static void __devinit pcibios_fixup_bridge(struct pci_bus *bus) | |
1020 | { | |
1021 | struct resource *res; | |
1022 | int i; | |
1023 | ||
1024 | struct pci_dev *dev = bus->self; | |
1025 | ||
8a66da71 | 1026 | pci_bus_for_each_resource(bus, res, i) { |
d3afa58c MS |
1027 | if (!res) |
1028 | continue; | |
1029 | if (!res->flags) | |
1030 | continue; | |
1031 | if (i >= 3 && bus->self->transparent) | |
1032 | continue; | |
1033 | ||
1034 | pr_debug("PCI:%s Bus rsrc %d %016llx-%016llx [%x] fixup...\n", | |
1035 | pci_name(dev), i, | |
1036 | (unsigned long long)res->start,\ | |
1037 | (unsigned long long)res->end, | |
1038 | (unsigned int)res->flags); | |
1039 | ||
1040 | /* Perform fixup */ | |
1041 | fixup_resource(res, dev); | |
1042 | ||
1043 | /* Try to detect uninitialized P2P bridge resources, | |
1044 | * and clear them out so they get re-assigned later | |
1045 | */ | |
1046 | if (pcibios_uninitialized_bridge_resource(bus, res)) { | |
1047 | res->flags = 0; | |
1048 | pr_debug("PCI:%s (unassigned)\n", | |
1049 | pci_name(dev)); | |
1050 | } else { | |
1051 | pr_debug("PCI:%s %016llx-%016llx\n", | |
1052 | pci_name(dev), | |
1053 | (unsigned long long)res->start, | |
1054 | (unsigned long long)res->end); | |
1055 | } | |
1056 | } | |
1057 | } | |
1058 | ||
1059 | void __devinit pcibios_setup_bus_self(struct pci_bus *bus) | |
1060 | { | |
1061 | /* Fix up the bus resources for P2P bridges */ | |
1062 | if (bus->self != NULL) | |
1063 | pcibios_fixup_bridge(bus); | |
1064 | } | |
1065 | ||
1066 | void __devinit pcibios_setup_bus_devices(struct pci_bus *bus) | |
1067 | { | |
1068 | struct pci_dev *dev; | |
1069 | ||
1070 | pr_debug("PCI: Fixup bus devices %d (%s)\n", | |
1071 | bus->number, bus->self ? pci_name(bus->self) : "PHB"); | |
1072 | ||
1073 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
d3afa58c | 1074 | /* Setup OF node pointer in archdata */ |
088ab302 | 1075 | dev->dev.of_node = pci_device_to_OF_node(dev); |
d3afa58c MS |
1076 | |
1077 | /* Fixup NUMA node as it may not be setup yet by the generic | |
1078 | * code and is needed by the DMA init | |
1079 | */ | |
1080 | set_dev_node(&dev->dev, pcibus_to_node(dev->bus)); | |
1081 | ||
1082 | /* Hook up default DMA ops */ | |
6c3bbdd6 NA |
1083 | set_dma_ops(&dev->dev, pci_dma_ops); |
1084 | dev->dev.archdata.dma_data = (void *)PCI_DRAM_OFFSET; | |
d3afa58c MS |
1085 | |
1086 | /* Read default IRQs and fixup if necessary */ | |
1087 | pci_read_irq_line(dev); | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | void __devinit pcibios_fixup_bus(struct pci_bus *bus) | |
1092 | { | |
1093 | /* When called from the generic PCI probe, read PCI<->PCI bridge | |
1094 | * bases. This is -not- called when generating the PCI tree from | |
1095 | * the OF device-tree. | |
1096 | */ | |
1097 | if (bus->self != NULL) | |
1098 | pci_read_bridge_bases(bus); | |
1099 | ||
1100 | /* Now fixup the bus bus */ | |
1101 | pcibios_setup_bus_self(bus); | |
1102 | ||
1103 | /* Now fixup devices on that bus */ | |
1104 | pcibios_setup_bus_devices(bus); | |
1105 | } | |
1106 | EXPORT_SYMBOL(pcibios_fixup_bus); | |
1107 | ||
1108 | static int skip_isa_ioresource_align(struct pci_dev *dev) | |
1109 | { | |
1110 | if ((pci_flags & PCI_CAN_SKIP_ISA_ALIGN) && | |
1111 | !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA)) | |
1112 | return 1; | |
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * We need to avoid collisions with `mirrored' VGA ports | |
1118 | * and other strange ISA hardware, so we always want the | |
1119 | * addresses to be allocated in the 0x000-0x0ff region | |
1120 | * modulo 0x400. | |
1121 | * | |
1122 | * Why? Because some silly external IO cards only decode | |
1123 | * the low 10 bits of the IO address. The 0x00-0xff region | |
1124 | * is reserved for motherboard devices that decode all 16 | |
1125 | * bits, so it's ok to allocate at, say, 0x2800-0x28ff, | |
1126 | * but we want to try to avoid allocating at 0x2900-0x2bff | |
1127 | * which might have be mirrored at 0x0100-0x03ff.. | |
1128 | */ | |
c86fac43 | 1129 | resource_size_t pcibios_align_resource(void *data, const struct resource *res, |
d3afa58c MS |
1130 | resource_size_t size, resource_size_t align) |
1131 | { | |
1132 | struct pci_dev *dev = data; | |
c86fac43 | 1133 | resource_size_t start = res->start; |
d3afa58c MS |
1134 | |
1135 | if (res->flags & IORESOURCE_IO) { | |
d3afa58c | 1136 | if (skip_isa_ioresource_align(dev)) |
c86fac43 MS |
1137 | return start; |
1138 | if (start & 0x300) | |
d3afa58c | 1139 | start = (start + 0x3ff) & ~0x3ff; |
d3afa58c | 1140 | } |
c86fac43 MS |
1141 | |
1142 | return start; | |
d3afa58c MS |
1143 | } |
1144 | EXPORT_SYMBOL(pcibios_align_resource); | |
1145 | ||
1146 | /* | |
1147 | * Reparent resource children of pr that conflict with res | |
1148 | * under res, and make res replace those children. | |
1149 | */ | |
1150 | static int __init reparent_resources(struct resource *parent, | |
1151 | struct resource *res) | |
1152 | { | |
1153 | struct resource *p, **pp; | |
1154 | struct resource **firstpp = NULL; | |
1155 | ||
1156 | for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) { | |
1157 | if (p->end < res->start) | |
1158 | continue; | |
1159 | if (res->end < p->start) | |
1160 | break; | |
1161 | if (p->start < res->start || p->end > res->end) | |
1162 | return -1; /* not completely contained */ | |
1163 | if (firstpp == NULL) | |
1164 | firstpp = pp; | |
1165 | } | |
1166 | if (firstpp == NULL) | |
1167 | return -1; /* didn't find any conflicting entries? */ | |
1168 | res->parent = parent; | |
1169 | res->child = *firstpp; | |
1170 | res->sibling = *pp; | |
1171 | *firstpp = res; | |
1172 | *pp = NULL; | |
1173 | for (p = res->child; p != NULL; p = p->sibling) { | |
1174 | p->parent = res; | |
1175 | pr_debug("PCI: Reparented %s [%llx..%llx] under %s\n", | |
1176 | p->name, | |
1177 | (unsigned long long)p->start, | |
1178 | (unsigned long long)p->end, res->name); | |
1179 | } | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | /* | |
1184 | * Handle resources of PCI devices. If the world were perfect, we could | |
1185 | * just allocate all the resource regions and do nothing more. It isn't. | |
1186 | * On the other hand, we cannot just re-allocate all devices, as it would | |
1187 | * require us to know lots of host bridge internals. So we attempt to | |
1188 | * keep as much of the original configuration as possible, but tweak it | |
1189 | * when it's found to be wrong. | |
1190 | * | |
1191 | * Known BIOS problems we have to work around: | |
1192 | * - I/O or memory regions not configured | |
1193 | * - regions configured, but not enabled in the command register | |
1194 | * - bogus I/O addresses above 64K used | |
1195 | * - expansion ROMs left enabled (this may sound harmless, but given | |
1196 | * the fact the PCI specs explicitly allow address decoders to be | |
1197 | * shared between expansion ROMs and other resource regions, it's | |
1198 | * at least dangerous) | |
1199 | * | |
1200 | * Our solution: | |
1201 | * (1) Allocate resources for all buses behind PCI-to-PCI bridges. | |
1202 | * This gives us fixed barriers on where we can allocate. | |
1203 | * (2) Allocate resources for all enabled devices. If there is | |
1204 | * a collision, just mark the resource as unallocated. Also | |
1205 | * disable expansion ROMs during this step. | |
1206 | * (3) Try to allocate resources for disabled devices. If the | |
1207 | * resources were assigned correctly, everything goes well, | |
1208 | * if they weren't, they won't disturb allocation of other | |
1209 | * resources. | |
1210 | * (4) Assign new addresses to resources which were either | |
1211 | * not configured at all or misconfigured. If explicitly | |
1212 | * requested by the user, configure expansion ROM address | |
1213 | * as well. | |
1214 | */ | |
1215 | ||
1216 | void pcibios_allocate_bus_resources(struct pci_bus *bus) | |
1217 | { | |
1218 | struct pci_bus *b; | |
1219 | int i; | |
1220 | struct resource *res, *pr; | |
1221 | ||
1222 | pr_debug("PCI: Allocating bus resources for %04x:%02x...\n", | |
1223 | pci_domain_nr(bus), bus->number); | |
1224 | ||
8a66da71 | 1225 | pci_bus_for_each_resource(bus, res, i) { |
d3afa58c MS |
1226 | if (!res || !res->flags |
1227 | || res->start > res->end || res->parent) | |
1228 | continue; | |
1229 | if (bus->parent == NULL) | |
1230 | pr = (res->flags & IORESOURCE_IO) ? | |
1231 | &ioport_resource : &iomem_resource; | |
1232 | else { | |
1233 | /* Don't bother with non-root busses when | |
1234 | * re-assigning all resources. We clear the | |
1235 | * resource flags as if they were colliding | |
1236 | * and as such ensure proper re-allocation | |
1237 | * later. | |
1238 | */ | |
1239 | if (pci_flags & PCI_REASSIGN_ALL_RSRC) | |
1240 | goto clear_resource; | |
1241 | pr = pci_find_parent_resource(bus->self, res); | |
1242 | if (pr == res) { | |
1243 | /* this happens when the generic PCI | |
1244 | * code (wrongly) decides that this | |
1245 | * bridge is transparent -- paulus | |
1246 | */ | |
1247 | continue; | |
1248 | } | |
1249 | } | |
1250 | ||
1251 | pr_debug("PCI: %s (bus %d) bridge rsrc %d: %016llx-%016llx " | |
1252 | "[0x%x], parent %p (%s)\n", | |
1253 | bus->self ? pci_name(bus->self) : "PHB", | |
1254 | bus->number, i, | |
1255 | (unsigned long long)res->start, | |
1256 | (unsigned long long)res->end, | |
1257 | (unsigned int)res->flags, | |
1258 | pr, (pr && pr->name) ? pr->name : "nil"); | |
1259 | ||
1260 | if (pr && !(pr->flags & IORESOURCE_UNSET)) { | |
1261 | if (request_resource(pr, res) == 0) | |
1262 | continue; | |
1263 | /* | |
1264 | * Must be a conflict with an existing entry. | |
1265 | * Move that entry (or entries) under the | |
1266 | * bridge resource and try again. | |
1267 | */ | |
1268 | if (reparent_resources(pr, res) == 0) | |
1269 | continue; | |
1270 | } | |
1271 | printk(KERN_WARNING "PCI: Cannot allocate resource region " | |
1272 | "%d of PCI bridge %d, will remap\n", i, bus->number); | |
1273 | clear_resource: | |
837c4ef1 | 1274 | res->start = res->end = 0; |
d3afa58c MS |
1275 | res->flags = 0; |
1276 | } | |
1277 | ||
1278 | list_for_each_entry(b, &bus->children, node) | |
1279 | pcibios_allocate_bus_resources(b); | |
1280 | } | |
1281 | ||
1282 | static inline void __devinit alloc_resource(struct pci_dev *dev, int idx) | |
1283 | { | |
1284 | struct resource *pr, *r = &dev->resource[idx]; | |
1285 | ||
1286 | pr_debug("PCI: Allocating %s: Resource %d: %016llx..%016llx [%x]\n", | |
1287 | pci_name(dev), idx, | |
1288 | (unsigned long long)r->start, | |
1289 | (unsigned long long)r->end, | |
1290 | (unsigned int)r->flags); | |
1291 | ||
1292 | pr = pci_find_parent_resource(dev, r); | |
1293 | if (!pr || (pr->flags & IORESOURCE_UNSET) || | |
1294 | request_resource(pr, r) < 0) { | |
1295 | printk(KERN_WARNING "PCI: Cannot allocate resource region %d" | |
1296 | " of device %s, will remap\n", idx, pci_name(dev)); | |
1297 | if (pr) | |
1298 | pr_debug("PCI: parent is %p: %016llx-%016llx [%x]\n", | |
1299 | pr, | |
1300 | (unsigned long long)pr->start, | |
1301 | (unsigned long long)pr->end, | |
1302 | (unsigned int)pr->flags); | |
1303 | /* We'll assign a new address later */ | |
1304 | r->flags |= IORESOURCE_UNSET; | |
1305 | r->end -= r->start; | |
1306 | r->start = 0; | |
1307 | } | |
1308 | } | |
1309 | ||
1310 | static void __init pcibios_allocate_resources(int pass) | |
1311 | { | |
1312 | struct pci_dev *dev = NULL; | |
1313 | int idx, disabled; | |
1314 | u16 command; | |
1315 | struct resource *r; | |
1316 | ||
1317 | for_each_pci_dev(dev) { | |
1318 | pci_read_config_word(dev, PCI_COMMAND, &command); | |
1319 | for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) { | |
1320 | r = &dev->resource[idx]; | |
1321 | if (r->parent) /* Already allocated */ | |
1322 | continue; | |
1323 | if (!r->flags || (r->flags & IORESOURCE_UNSET)) | |
1324 | continue; /* Not assigned at all */ | |
1325 | /* We only allocate ROMs on pass 1 just in case they | |
1326 | * have been screwed up by firmware | |
1327 | */ | |
1328 | if (idx == PCI_ROM_RESOURCE) | |
1329 | disabled = 1; | |
1330 | if (r->flags & IORESOURCE_IO) | |
1331 | disabled = !(command & PCI_COMMAND_IO); | |
1332 | else | |
1333 | disabled = !(command & PCI_COMMAND_MEMORY); | |
1334 | if (pass == disabled) | |
1335 | alloc_resource(dev, idx); | |
1336 | } | |
1337 | if (pass) | |
1338 | continue; | |
1339 | r = &dev->resource[PCI_ROM_RESOURCE]; | |
1340 | if (r->flags) { | |
1341 | /* Turn the ROM off, leave the resource region, | |
1342 | * but keep it unregistered. | |
1343 | */ | |
1344 | u32 reg; | |
1345 | pci_read_config_dword(dev, dev->rom_base_reg, ®); | |
1346 | if (reg & PCI_ROM_ADDRESS_ENABLE) { | |
1347 | pr_debug("PCI: Switching off ROM of %s\n", | |
1348 | pci_name(dev)); | |
1349 | r->flags &= ~IORESOURCE_ROM_ENABLE; | |
1350 | pci_write_config_dword(dev, dev->rom_base_reg, | |
1351 | reg & ~PCI_ROM_ADDRESS_ENABLE); | |
1352 | } | |
1353 | } | |
1354 | } | |
1355 | } | |
1356 | ||
1357 | static void __init pcibios_reserve_legacy_regions(struct pci_bus *bus) | |
1358 | { | |
1359 | struct pci_controller *hose = pci_bus_to_host(bus); | |
1360 | resource_size_t offset; | |
1361 | struct resource *res, *pres; | |
1362 | int i; | |
1363 | ||
1364 | pr_debug("Reserving legacy ranges for domain %04x\n", | |
1365 | pci_domain_nr(bus)); | |
1366 | ||
1367 | /* Check for IO */ | |
1368 | if (!(hose->io_resource.flags & IORESOURCE_IO)) | |
1369 | goto no_io; | |
1370 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; | |
1371 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
1372 | BUG_ON(res == NULL); | |
1373 | res->name = "Legacy IO"; | |
1374 | res->flags = IORESOURCE_IO; | |
1375 | res->start = offset; | |
1376 | res->end = (offset + 0xfff) & 0xfffffffful; | |
1377 | pr_debug("Candidate legacy IO: %pR\n", res); | |
1378 | if (request_resource(&hose->io_resource, res)) { | |
1379 | printk(KERN_DEBUG | |
1380 | "PCI %04x:%02x Cannot reserve Legacy IO %pR\n", | |
1381 | pci_domain_nr(bus), bus->number, res); | |
1382 | kfree(res); | |
1383 | } | |
1384 | ||
1385 | no_io: | |
1386 | /* Check for memory */ | |
1387 | offset = hose->pci_mem_offset; | |
1388 | pr_debug("hose mem offset: %016llx\n", (unsigned long long)offset); | |
1389 | for (i = 0; i < 3; i++) { | |
1390 | pres = &hose->mem_resources[i]; | |
1391 | if (!(pres->flags & IORESOURCE_MEM)) | |
1392 | continue; | |
1393 | pr_debug("hose mem res: %pR\n", pres); | |
1394 | if ((pres->start - offset) <= 0xa0000 && | |
1395 | (pres->end - offset) >= 0xbffff) | |
1396 | break; | |
1397 | } | |
1398 | if (i >= 3) | |
1399 | return; | |
1400 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
1401 | BUG_ON(res == NULL); | |
1402 | res->name = "Legacy VGA memory"; | |
1403 | res->flags = IORESOURCE_MEM; | |
1404 | res->start = 0xa0000 + offset; | |
1405 | res->end = 0xbffff + offset; | |
1406 | pr_debug("Candidate VGA memory: %pR\n", res); | |
1407 | if (request_resource(pres, res)) { | |
1408 | printk(KERN_DEBUG | |
1409 | "PCI %04x:%02x Cannot reserve VGA memory %pR\n", | |
1410 | pci_domain_nr(bus), bus->number, res); | |
1411 | kfree(res); | |
1412 | } | |
1413 | } | |
1414 | ||
1415 | void __init pcibios_resource_survey(void) | |
1416 | { | |
1417 | struct pci_bus *b; | |
1418 | ||
1419 | /* Allocate and assign resources. If we re-assign everything, then | |
1420 | * we skip the allocate phase | |
1421 | */ | |
1422 | list_for_each_entry(b, &pci_root_buses, node) | |
1423 | pcibios_allocate_bus_resources(b); | |
1424 | ||
1425 | if (!(pci_flags & PCI_REASSIGN_ALL_RSRC)) { | |
1426 | pcibios_allocate_resources(0); | |
1427 | pcibios_allocate_resources(1); | |
1428 | } | |
1429 | ||
1430 | /* Before we start assigning unassigned resource, we try to reserve | |
1431 | * the low IO area and the VGA memory area if they intersect the | |
1432 | * bus available resources to avoid allocating things on top of them | |
1433 | */ | |
1434 | if (!(pci_flags & PCI_PROBE_ONLY)) { | |
1435 | list_for_each_entry(b, &pci_root_buses, node) | |
1436 | pcibios_reserve_legacy_regions(b); | |
1437 | } | |
1438 | ||
1439 | /* Now, if the platform didn't decide to blindly trust the firmware, | |
1440 | * we proceed to assigning things that were left unassigned | |
1441 | */ | |
1442 | if (!(pci_flags & PCI_PROBE_ONLY)) { | |
1443 | pr_debug("PCI: Assigning unassigned resources...\n"); | |
1444 | pci_assign_unassigned_resources(); | |
1445 | } | |
1446 | } | |
1447 | ||
1448 | #ifdef CONFIG_HOTPLUG | |
1449 | ||
1450 | /* This is used by the PCI hotplug driver to allocate resource | |
1451 | * of newly plugged busses. We can try to consolidate with the | |
1452 | * rest of the code later, for now, keep it as-is as our main | |
1453 | * resource allocation function doesn't deal with sub-trees yet. | |
1454 | */ | |
1455 | void __devinit pcibios_claim_one_bus(struct pci_bus *bus) | |
1456 | { | |
1457 | struct pci_dev *dev; | |
1458 | struct pci_bus *child_bus; | |
1459 | ||
1460 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1461 | int i; | |
1462 | ||
1463 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
1464 | struct resource *r = &dev->resource[i]; | |
1465 | ||
1466 | if (r->parent || !r->start || !r->flags) | |
1467 | continue; | |
1468 | ||
1469 | pr_debug("PCI: Claiming %s: " | |
1470 | "Resource %d: %016llx..%016llx [%x]\n", | |
1471 | pci_name(dev), i, | |
1472 | (unsigned long long)r->start, | |
1473 | (unsigned long long)r->end, | |
1474 | (unsigned int)r->flags); | |
1475 | ||
1476 | pci_claim_resource(dev, i); | |
1477 | } | |
1478 | } | |
1479 | ||
1480 | list_for_each_entry(child_bus, &bus->children, node) | |
1481 | pcibios_claim_one_bus(child_bus); | |
1482 | } | |
1483 | EXPORT_SYMBOL_GPL(pcibios_claim_one_bus); | |
1484 | ||
1485 | ||
1486 | /* pcibios_finish_adding_to_bus | |
1487 | * | |
1488 | * This is to be called by the hotplug code after devices have been | |
1489 | * added to a bus, this include calling it for a PHB that is just | |
1490 | * being added | |
1491 | */ | |
1492 | void pcibios_finish_adding_to_bus(struct pci_bus *bus) | |
1493 | { | |
1494 | pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n", | |
1495 | pci_domain_nr(bus), bus->number); | |
1496 | ||
1497 | /* Allocate bus and devices resources */ | |
1498 | pcibios_allocate_bus_resources(bus); | |
1499 | pcibios_claim_one_bus(bus); | |
1500 | ||
1501 | /* Add new devices to global lists. Register in proc, sysfs. */ | |
1502 | pci_bus_add_devices(bus); | |
1503 | ||
1504 | /* Fixup EEH */ | |
1ce2470a | 1505 | /* eeh_add_device_tree_late(bus); */ |
d3afa58c MS |
1506 | } |
1507 | EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus); | |
1508 | ||
1509 | #endif /* CONFIG_HOTPLUG */ | |
1510 | ||
1511 | int pcibios_enable_device(struct pci_dev *dev, int mask) | |
1512 | { | |
1513 | return pci_enable_resources(dev, mask); | |
1514 | } | |
1515 | ||
1516 | void __devinit pcibios_setup_phb_resources(struct pci_controller *hose) | |
1517 | { | |
1518 | struct pci_bus *bus = hose->bus; | |
1519 | struct resource *res; | |
1520 | int i; | |
1521 | ||
1522 | /* Hookup PHB IO resource */ | |
1523 | bus->resource[0] = res = &hose->io_resource; | |
1524 | ||
1525 | if (!res->flags) { | |
1526 | printk(KERN_WARNING "PCI: I/O resource not set for host" | |
1527 | " bridge %s (domain %d)\n", | |
1528 | hose->dn->full_name, hose->global_number); | |
1529 | /* Workaround for lack of IO resource only on 32-bit */ | |
1530 | res->start = (unsigned long)hose->io_base_virt - isa_io_base; | |
1531 | res->end = res->start + IO_SPACE_LIMIT; | |
1532 | res->flags = IORESOURCE_IO; | |
1533 | } | |
1534 | ||
1535 | pr_debug("PCI: PHB IO resource = %016llx-%016llx [%lx]\n", | |
1536 | (unsigned long long)res->start, | |
1537 | (unsigned long long)res->end, | |
1538 | (unsigned long)res->flags); | |
1539 | ||
1540 | /* Hookup PHB Memory resources */ | |
1541 | for (i = 0; i < 3; ++i) { | |
1542 | res = &hose->mem_resources[i]; | |
1543 | if (!res->flags) { | |
1544 | if (i > 0) | |
1545 | continue; | |
1546 | printk(KERN_ERR "PCI: Memory resource 0 not set for " | |
1547 | "host bridge %s (domain %d)\n", | |
1548 | hose->dn->full_name, hose->global_number); | |
1549 | ||
1550 | /* Workaround for lack of MEM resource only on 32-bit */ | |
1551 | res->start = hose->pci_mem_offset; | |
1552 | res->end = (resource_size_t)-1LL; | |
1553 | res->flags = IORESOURCE_MEM; | |
1554 | ||
1555 | } | |
1556 | bus->resource[i+1] = res; | |
1557 | ||
1558 | pr_debug("PCI: PHB MEM resource %d = %016llx-%016llx [%lx]\n", | |
1559 | i, (unsigned long long)res->start, | |
1560 | (unsigned long long)res->end, | |
1561 | (unsigned long)res->flags); | |
1562 | } | |
1563 | ||
1564 | pr_debug("PCI: PHB MEM offset = %016llx\n", | |
1565 | (unsigned long long)hose->pci_mem_offset); | |
1566 | pr_debug("PCI: PHB IO offset = %08lx\n", | |
1567 | (unsigned long)hose->io_base_virt - _IO_BASE); | |
1568 | } | |
1569 | ||
bf13a6fa BH |
1570 | struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) |
1571 | { | |
1572 | struct pci_controller *hose = bus->sysdata; | |
1573 | ||
1574 | return of_node_get(hose->dn); | |
1575 | } | |
1576 | ||
1577 | static void __devinit pcibios_scan_phb(struct pci_controller *hose) | |
1578 | { | |
1579 | struct pci_bus *bus; | |
1580 | struct device_node *node = hose->dn; | |
1581 | unsigned long io_offset; | |
1582 | struct resource *res = &hose->io_resource; | |
1583 | ||
1584 | pr_debug("PCI: Scanning PHB %s\n", | |
1585 | node ? node->full_name : "<NO NAME>"); | |
1586 | ||
1587 | /* Create an empty bus for the toplevel */ | |
1588 | bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose); | |
1589 | if (bus == NULL) { | |
1590 | printk(KERN_ERR "Failed to create bus for PCI domain %04x\n", | |
1591 | hose->global_number); | |
1592 | return; | |
1593 | } | |
1594 | bus->secondary = hose->first_busno; | |
1595 | hose->bus = bus; | |
1596 | ||
1597 | /* Fixup IO space offset */ | |
1598 | io_offset = (unsigned long)hose->io_base_virt - isa_io_base; | |
1599 | res->start = (res->start + io_offset) & 0xffffffffu; | |
1600 | res->end = (res->end + io_offset) & 0xffffffffu; | |
1601 | ||
1602 | /* Wire up PHB bus resources */ | |
1603 | pcibios_setup_phb_resources(hose); | |
1604 | ||
1605 | /* Scan children */ | |
1606 | hose->last_busno = bus->subordinate = pci_scan_child_bus(bus); | |
1607 | } | |
1608 | ||
1609 | static int __init pcibios_init(void) | |
1610 | { | |
1611 | struct pci_controller *hose, *tmp; | |
1612 | int next_busno = 0; | |
1613 | ||
1614 | printk(KERN_INFO "PCI: Probing PCI hardware\n"); | |
1615 | ||
1616 | /* Scan all of the recorded PCI controllers. */ | |
1617 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { | |
1618 | hose->last_busno = 0xff; | |
1619 | pcibios_scan_phb(hose); | |
1620 | printk(KERN_INFO "calling pci_bus_add_devices()\n"); | |
1621 | pci_bus_add_devices(hose->bus); | |
1622 | if (next_busno <= hose->last_busno) | |
1623 | next_busno = hose->last_busno + 1; | |
1624 | } | |
1625 | pci_bus_count = next_busno; | |
1626 | ||
1627 | /* Call common code to handle resource allocation */ | |
1628 | pcibios_resource_survey(); | |
1629 | ||
1630 | return 0; | |
1631 | } | |
1632 | ||
1633 | subsys_initcall(pcibios_init); | |
1634 | ||
1635 | static struct pci_controller *pci_bus_to_hose(int bus) | |
1636 | { | |
1637 | struct pci_controller *hose, *tmp; | |
1638 | ||
1639 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) | |
1640 | if (bus >= hose->first_busno && bus <= hose->last_busno) | |
1641 | return hose; | |
1642 | return NULL; | |
1643 | } | |
1644 | ||
1645 | /* Provide information on locations of various I/O regions in physical | |
1646 | * memory. Do this on a per-card basis so that we choose the right | |
1647 | * root bridge. | |
1648 | * Note that the returned IO or memory base is a physical address | |
1649 | */ | |
1650 | ||
1651 | long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) | |
1652 | { | |
1653 | struct pci_controller *hose; | |
1654 | long result = -EOPNOTSUPP; | |
1655 | ||
1656 | hose = pci_bus_to_hose(bus); | |
1657 | if (!hose) | |
1658 | return -ENODEV; | |
1659 | ||
1660 | switch (which) { | |
1661 | case IOBASE_BRIDGE_NUMBER: | |
1662 | return (long)hose->first_busno; | |
1663 | case IOBASE_MEMORY: | |
1664 | return (long)hose->pci_mem_offset; | |
1665 | case IOBASE_IO: | |
1666 | return (long)hose->io_base_phys; | |
1667 | case IOBASE_ISA_IO: | |
1668 | return (long)isa_io_base; | |
1669 | case IOBASE_ISA_MEM: | |
1670 | return (long)isa_mem_base; | |
1671 | } | |
1672 | ||
1673 | return result; | |
1674 | } | |
1675 | ||
d3afa58c MS |
1676 | /* |
1677 | * Null PCI config access functions, for the case when we can't | |
1678 | * find a hose. | |
1679 | */ | |
1680 | #define NULL_PCI_OP(rw, size, type) \ | |
1681 | static int \ | |
1682 | null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \ | |
1683 | { \ | |
1684 | return PCIBIOS_DEVICE_NOT_FOUND; \ | |
1685 | } | |
1686 | ||
1687 | static int | |
1688 | null_read_config(struct pci_bus *bus, unsigned int devfn, int offset, | |
1689 | int len, u32 *val) | |
1690 | { | |
1691 | return PCIBIOS_DEVICE_NOT_FOUND; | |
1692 | } | |
1693 | ||
1694 | static int | |
1695 | null_write_config(struct pci_bus *bus, unsigned int devfn, int offset, | |
1696 | int len, u32 val) | |
1697 | { | |
1698 | return PCIBIOS_DEVICE_NOT_FOUND; | |
1699 | } | |
1700 | ||
1701 | static struct pci_ops null_pci_ops = { | |
1702 | .read = null_read_config, | |
1703 | .write = null_write_config, | |
1704 | }; | |
1705 | ||
1706 | /* | |
1707 | * These functions are used early on before PCI scanning is done | |
1708 | * and all of the pci_dev and pci_bus structures have been created. | |
1709 | */ | |
1710 | static struct pci_bus * | |
1711 | fake_pci_bus(struct pci_controller *hose, int busnr) | |
1712 | { | |
1713 | static struct pci_bus bus; | |
1714 | ||
1715 | if (!hose) | |
1716 | printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr); | |
1717 | ||
1718 | bus.number = busnr; | |
1719 | bus.sysdata = hose; | |
1720 | bus.ops = hose ? hose->ops : &null_pci_ops; | |
1721 | return &bus; | |
1722 | } | |
1723 | ||
1724 | #define EARLY_PCI_OP(rw, size, type) \ | |
1725 | int early_##rw##_config_##size(struct pci_controller *hose, int bus, \ | |
1726 | int devfn, int offset, type value) \ | |
1727 | { \ | |
1728 | return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \ | |
1729 | devfn, offset, value); \ | |
1730 | } | |
1731 | ||
1732 | EARLY_PCI_OP(read, byte, u8 *) | |
1733 | EARLY_PCI_OP(read, word, u16 *) | |
1734 | EARLY_PCI_OP(read, dword, u32 *) | |
1735 | EARLY_PCI_OP(write, byte, u8) | |
1736 | EARLY_PCI_OP(write, word, u16) | |
1737 | EARLY_PCI_OP(write, dword, u32) | |
1738 | ||
1739 | int early_find_capability(struct pci_controller *hose, int bus, int devfn, | |
1740 | int cap) | |
1741 | { | |
1742 | return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap); | |
1743 | } | |
bf13a6fa | 1744 |