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