Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * pci.c - Low-Level PCI Access in IA-64 | |
3 | * | |
4 | * Derived from bios32.c of i386 tree. | |
5 | * | |
6 | * (c) Copyright 2002, 2005 Hewlett-Packard Development Company, L.P. | |
7 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
8 | * Bjorn Helgaas <bjorn.helgaas@hp.com> | |
9 | * Copyright (C) 2004 Silicon Graphics, Inc. | |
10 | * | |
11 | * Note: Above list of copyright holders is incomplete... | |
12 | */ | |
13 | #include <linux/config.h> | |
14 | ||
15 | #include <linux/acpi.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/pci.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/ioport.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/smp_lock.h> | |
23 | #include <linux/spinlock.h> | |
24 | ||
25 | #include <asm/machvec.h> | |
26 | #include <asm/page.h> | |
1da177e4 LT |
27 | #include <asm/system.h> |
28 | #include <asm/io.h> | |
29 | #include <asm/sal.h> | |
30 | #include <asm/smp.h> | |
31 | #include <asm/irq.h> | |
32 | #include <asm/hw_irq.h> | |
33 | ||
1da177e4 LT |
34 | /* |
35 | * Low-level SAL-based PCI configuration access functions. Note that SAL | |
36 | * calls are already serialized (via sal_lock), so we don't need another | |
37 | * synchronization mechanism here. | |
38 | */ | |
39 | ||
40 | #define PCI_SAL_ADDRESS(seg, bus, devfn, reg) \ | |
41 | (((u64) seg << 24) | (bus << 16) | (devfn << 8) | (reg)) | |
42 | ||
43 | /* SAL 3.2 adds support for extended config space. */ | |
44 | ||
45 | #define PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg) \ | |
46 | (((u64) seg << 28) | (bus << 20) | (devfn << 12) | (reg)) | |
47 | ||
48 | static int | |
49 | pci_sal_read (unsigned int seg, unsigned int bus, unsigned int devfn, | |
50 | int reg, int len, u32 *value) | |
51 | { | |
52 | u64 addr, data = 0; | |
53 | int mode, result; | |
54 | ||
55 | if (!value || (seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095)) | |
56 | return -EINVAL; | |
57 | ||
58 | if ((seg | reg) <= 255) { | |
59 | addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg); | |
60 | mode = 0; | |
61 | } else { | |
62 | addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg); | |
63 | mode = 1; | |
64 | } | |
65 | result = ia64_sal_pci_config_read(addr, mode, len, &data); | |
66 | if (result != 0) | |
67 | return -EINVAL; | |
68 | ||
69 | *value = (u32) data; | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static int | |
74 | pci_sal_write (unsigned int seg, unsigned int bus, unsigned int devfn, | |
75 | int reg, int len, u32 value) | |
76 | { | |
77 | u64 addr; | |
78 | int mode, result; | |
79 | ||
80 | if ((seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095)) | |
81 | return -EINVAL; | |
82 | ||
83 | if ((seg | reg) <= 255) { | |
84 | addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg); | |
85 | mode = 0; | |
86 | } else { | |
87 | addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg); | |
88 | mode = 1; | |
89 | } | |
90 | result = ia64_sal_pci_config_write(addr, mode, len, value); | |
91 | if (result != 0) | |
92 | return -EINVAL; | |
93 | return 0; | |
94 | } | |
95 | ||
96 | static struct pci_raw_ops pci_sal_ops = { | |
4f41d5a4 | 97 | .read = pci_sal_read, |
1da177e4 LT |
98 | .write = pci_sal_write |
99 | }; | |
100 | ||
101 | struct pci_raw_ops *raw_pci_ops = &pci_sal_ops; | |
102 | ||
103 | static int | |
104 | pci_read (struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value) | |
105 | { | |
106 | return raw_pci_ops->read(pci_domain_nr(bus), bus->number, | |
107 | devfn, where, size, value); | |
108 | } | |
109 | ||
110 | static int | |
111 | pci_write (struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value) | |
112 | { | |
113 | return raw_pci_ops->write(pci_domain_nr(bus), bus->number, | |
114 | devfn, where, size, value); | |
115 | } | |
116 | ||
117 | struct pci_ops pci_root_ops = { | |
118 | .read = pci_read, | |
119 | .write = pci_write, | |
120 | }; | |
121 | ||
1da177e4 LT |
122 | /* Called by ACPI when it finds a new root bus. */ |
123 | ||
124 | static struct pci_controller * __devinit | |
125 | alloc_pci_controller (int seg) | |
126 | { | |
127 | struct pci_controller *controller; | |
128 | ||
129 | controller = kmalloc(sizeof(*controller), GFP_KERNEL); | |
130 | if (!controller) | |
131 | return NULL; | |
132 | ||
133 | memset(controller, 0, sizeof(*controller)); | |
134 | controller->segment = seg; | |
514604c6 | 135 | controller->node = -1; |
1da177e4 LT |
136 | return controller; |
137 | } | |
138 | ||
4f41d5a4 BH |
139 | struct pci_root_info { |
140 | struct pci_controller *controller; | |
141 | char *name; | |
142 | }; | |
143 | ||
144 | static unsigned int | |
145 | new_space (u64 phys_base, int sparse) | |
1da177e4 | 146 | { |
4f41d5a4 | 147 | u64 mmio_base; |
1da177e4 LT |
148 | int i; |
149 | ||
4f41d5a4 BH |
150 | if (phys_base == 0) |
151 | return 0; /* legacy I/O port space */ | |
1da177e4 | 152 | |
4f41d5a4 | 153 | mmio_base = (u64) ioremap(phys_base, 0); |
1da177e4 | 154 | for (i = 0; i < num_io_spaces; i++) |
4f41d5a4 | 155 | if (io_space[i].mmio_base == mmio_base && |
1da177e4 | 156 | io_space[i].sparse == sparse) |
4f41d5a4 | 157 | return i; |
1da177e4 LT |
158 | |
159 | if (num_io_spaces == MAX_IO_SPACES) { | |
4f41d5a4 BH |
160 | printk(KERN_ERR "PCI: Too many IO port spaces " |
161 | "(MAX_IO_SPACES=%lu)\n", MAX_IO_SPACES); | |
1da177e4 LT |
162 | return ~0; |
163 | } | |
164 | ||
165 | i = num_io_spaces++; | |
4f41d5a4 | 166 | io_space[i].mmio_base = mmio_base; |
1da177e4 LT |
167 | io_space[i].sparse = sparse; |
168 | ||
4f41d5a4 BH |
169 | return i; |
170 | } | |
171 | ||
172 | static u64 __devinit | |
173 | add_io_space (struct pci_root_info *info, struct acpi_resource_address64 *addr) | |
174 | { | |
175 | struct resource *resource; | |
176 | char *name; | |
177 | u64 base, min, max, base_port; | |
178 | unsigned int sparse = 0, space_nr, len; | |
179 | ||
180 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); | |
181 | if (!resource) { | |
182 | printk(KERN_ERR "PCI: No memory for %s I/O port space\n", | |
183 | info->name); | |
184 | goto out; | |
185 | } | |
186 | ||
187 | len = strlen(info->name) + 32; | |
188 | name = kzalloc(len, GFP_KERNEL); | |
189 | if (!name) { | |
190 | printk(KERN_ERR "PCI: No memory for %s I/O port space name\n", | |
191 | info->name); | |
192 | goto free_resource; | |
193 | } | |
194 | ||
50eca3eb | 195 | min = addr->minimum; |
4f41d5a4 | 196 | max = min + addr->address_length - 1; |
0897831b | 197 | if (addr->info.io.translation_type == ACPI_SPARSE_TRANSLATION) |
4f41d5a4 BH |
198 | sparse = 1; |
199 | ||
50eca3eb | 200 | space_nr = new_space(addr->translation_offset, sparse); |
4f41d5a4 BH |
201 | if (space_nr == ~0) |
202 | goto free_name; | |
203 | ||
204 | base = __pa(io_space[space_nr].mmio_base); | |
205 | base_port = IO_SPACE_BASE(space_nr); | |
206 | snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->name, | |
207 | base_port + min, base_port + max); | |
208 | ||
209 | /* | |
210 | * The SDM guarantees the legacy 0-64K space is sparse, but if the | |
211 | * mapping is done by the processor (not the bridge), ACPI may not | |
212 | * mark it as sparse. | |
213 | */ | |
214 | if (space_nr == 0) | |
215 | sparse = 1; | |
216 | ||
217 | resource->name = name; | |
218 | resource->flags = IORESOURCE_MEM; | |
219 | resource->start = base + (sparse ? IO_SPACE_SPARSE_ENCODING(min) : min); | |
220 | resource->end = base + (sparse ? IO_SPACE_SPARSE_ENCODING(max) : max); | |
221 | insert_resource(&iomem_resource, resource); | |
222 | ||
223 | return base_port; | |
224 | ||
225 | free_name: | |
226 | kfree(name); | |
227 | free_resource: | |
228 | kfree(resource); | |
229 | out: | |
230 | return ~0; | |
1da177e4 LT |
231 | } |
232 | ||
463eb297 BH |
233 | static acpi_status __devinit resource_to_window(struct acpi_resource *resource, |
234 | struct acpi_resource_address64 *addr) | |
235 | { | |
236 | acpi_status status; | |
237 | ||
238 | /* | |
239 | * We're only interested in _CRS descriptors that are | |
240 | * - address space descriptors for memory or I/O space | |
241 | * - non-zero size | |
242 | * - producers, i.e., the address space is routed downstream, | |
243 | * not consumed by the bridge itself | |
244 | */ | |
245 | status = acpi_resource_to_address64(resource, addr); | |
246 | if (ACPI_SUCCESS(status) && | |
247 | (addr->resource_type == ACPI_MEMORY_RANGE || | |
248 | addr->resource_type == ACPI_IO_RANGE) && | |
249 | addr->address_length && | |
250 | addr->producer_consumer == ACPI_PRODUCER) | |
251 | return AE_OK; | |
252 | ||
253 | return AE_ERROR; | |
254 | } | |
255 | ||
1da177e4 LT |
256 | static acpi_status __devinit |
257 | count_window (struct acpi_resource *resource, void *data) | |
258 | { | |
259 | unsigned int *windows = (unsigned int *) data; | |
260 | struct acpi_resource_address64 addr; | |
261 | acpi_status status; | |
262 | ||
463eb297 | 263 | status = resource_to_window(resource, &addr); |
1da177e4 | 264 | if (ACPI_SUCCESS(status)) |
463eb297 | 265 | (*windows)++; |
1da177e4 LT |
266 | |
267 | return AE_OK; | |
268 | } | |
269 | ||
1da177e4 LT |
270 | static __devinit acpi_status add_window(struct acpi_resource *res, void *data) |
271 | { | |
272 | struct pci_root_info *info = data; | |
273 | struct pci_window *window; | |
274 | struct acpi_resource_address64 addr; | |
275 | acpi_status status; | |
276 | unsigned long flags, offset = 0; | |
277 | struct resource *root; | |
278 | ||
463eb297 BH |
279 | /* Return AE_OK for non-window resources to keep scanning for more */ |
280 | status = resource_to_window(res, &addr); | |
1da177e4 LT |
281 | if (!ACPI_SUCCESS(status)) |
282 | return AE_OK; | |
283 | ||
1da177e4 LT |
284 | if (addr.resource_type == ACPI_MEMORY_RANGE) { |
285 | flags = IORESOURCE_MEM; | |
286 | root = &iomem_resource; | |
50eca3eb | 287 | offset = addr.translation_offset; |
1da177e4 LT |
288 | } else if (addr.resource_type == ACPI_IO_RANGE) { |
289 | flags = IORESOURCE_IO; | |
290 | root = &ioport_resource; | |
4f41d5a4 | 291 | offset = add_io_space(info, &addr); |
1da177e4 LT |
292 | if (offset == ~0) |
293 | return AE_OK; | |
294 | } else | |
295 | return AE_OK; | |
296 | ||
297 | window = &info->controller->window[info->controller->windows++]; | |
298 | window->resource.name = info->name; | |
299 | window->resource.flags = flags; | |
50eca3eb | 300 | window->resource.start = addr.minimum + offset; |
4f41d5a4 | 301 | window->resource.end = window->resource.start + addr.address_length - 1; |
1da177e4 LT |
302 | window->resource.child = NULL; |
303 | window->offset = offset; | |
304 | ||
305 | if (insert_resource(root, &window->resource)) { | |
306 | printk(KERN_ERR "alloc 0x%lx-0x%lx from %s for %s failed\n", | |
307 | window->resource.start, window->resource.end, | |
308 | root->name, info->name); | |
309 | } | |
310 | ||
311 | return AE_OK; | |
312 | } | |
313 | ||
314 | static void __devinit | |
315 | pcibios_setup_root_windows(struct pci_bus *bus, struct pci_controller *ctrl) | |
316 | { | |
317 | int i, j; | |
318 | ||
319 | j = 0; | |
320 | for (i = 0; i < ctrl->windows; i++) { | |
321 | struct resource *res = &ctrl->window[i].resource; | |
322 | /* HP's firmware has a hack to work around a Windows bug. | |
323 | * Ignore these tiny memory ranges */ | |
324 | if ((res->flags & IORESOURCE_MEM) && | |
325 | (res->end - res->start < 16)) | |
326 | continue; | |
327 | if (j >= PCI_BUS_NUM_RESOURCES) { | |
328 | printk("Ignoring range [%lx-%lx] (%lx)\n", res->start, | |
329 | res->end, res->flags); | |
330 | continue; | |
331 | } | |
332 | bus->resource[j++] = res; | |
333 | } | |
334 | } | |
335 | ||
336 | struct pci_bus * __devinit | |
337 | pci_acpi_scan_root(struct acpi_device *device, int domain, int bus) | |
338 | { | |
339 | struct pci_root_info info; | |
340 | struct pci_controller *controller; | |
341 | unsigned int windows = 0; | |
342 | struct pci_bus *pbus; | |
343 | char *name; | |
514604c6 | 344 | int pxm; |
1da177e4 LT |
345 | |
346 | controller = alloc_pci_controller(domain); | |
347 | if (!controller) | |
348 | goto out1; | |
349 | ||
350 | controller->acpi_handle = device->handle; | |
351 | ||
514604c6 CL |
352 | pxm = acpi_get_pxm(controller->acpi_handle); |
353 | #ifdef CONFIG_NUMA | |
354 | if (pxm >= 0) | |
762834e8 | 355 | controller->node = pxm_to_node(pxm); |
514604c6 CL |
356 | #endif |
357 | ||
1da177e4 LT |
358 | acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_window, |
359 | &windows); | |
514604c6 CL |
360 | controller->window = kmalloc_node(sizeof(*controller->window) * windows, |
361 | GFP_KERNEL, controller->node); | |
1da177e4 LT |
362 | if (!controller->window) |
363 | goto out2; | |
364 | ||
365 | name = kmalloc(16, GFP_KERNEL); | |
366 | if (!name) | |
367 | goto out3; | |
368 | ||
369 | sprintf(name, "PCI Bus %04x:%02x", domain, bus); | |
370 | info.controller = controller; | |
371 | info.name = name; | |
372 | acpi_walk_resources(device->handle, METHOD_NAME__CRS, add_window, | |
373 | &info); | |
374 | ||
c431ada4 | 375 | pbus = pci_scan_bus_parented(NULL, bus, &pci_root_ops, controller); |
1da177e4 LT |
376 | if (pbus) |
377 | pcibios_setup_root_windows(pbus, controller); | |
378 | ||
379 | return pbus; | |
380 | ||
381 | out3: | |
382 | kfree(controller->window); | |
383 | out2: | |
384 | kfree(controller); | |
385 | out1: | |
386 | return NULL; | |
387 | } | |
388 | ||
389 | void pcibios_resource_to_bus(struct pci_dev *dev, | |
390 | struct pci_bus_region *region, struct resource *res) | |
391 | { | |
392 | struct pci_controller *controller = PCI_CONTROLLER(dev); | |
393 | unsigned long offset = 0; | |
394 | int i; | |
395 | ||
396 | for (i = 0; i < controller->windows; i++) { | |
397 | struct pci_window *window = &controller->window[i]; | |
398 | if (!(window->resource.flags & res->flags)) | |
399 | continue; | |
400 | if (window->resource.start > res->start) | |
401 | continue; | |
402 | if (window->resource.end < res->end) | |
403 | continue; | |
404 | offset = window->offset; | |
405 | break; | |
406 | } | |
407 | ||
408 | region->start = res->start - offset; | |
409 | region->end = res->end - offset; | |
410 | } | |
411 | EXPORT_SYMBOL(pcibios_resource_to_bus); | |
412 | ||
413 | void pcibios_bus_to_resource(struct pci_dev *dev, | |
414 | struct resource *res, struct pci_bus_region *region) | |
415 | { | |
416 | struct pci_controller *controller = PCI_CONTROLLER(dev); | |
417 | unsigned long offset = 0; | |
418 | int i; | |
419 | ||
420 | for (i = 0; i < controller->windows; i++) { | |
421 | struct pci_window *window = &controller->window[i]; | |
422 | if (!(window->resource.flags & res->flags)) | |
423 | continue; | |
424 | if (window->resource.start - window->offset > region->start) | |
425 | continue; | |
426 | if (window->resource.end - window->offset < region->end) | |
427 | continue; | |
428 | offset = window->offset; | |
429 | break; | |
430 | } | |
431 | ||
432 | res->start = region->start + offset; | |
433 | res->end = region->end + offset; | |
434 | } | |
41290c14 | 435 | EXPORT_SYMBOL(pcibios_bus_to_resource); |
1da177e4 | 436 | |
71c3511c RS |
437 | static int __devinit is_valid_resource(struct pci_dev *dev, int idx) |
438 | { | |
439 | unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM; | |
440 | struct resource *devr = &dev->resource[idx]; | |
441 | ||
442 | if (!dev->bus) | |
443 | return 0; | |
444 | for (i=0; i<PCI_BUS_NUM_RESOURCES; i++) { | |
445 | struct resource *busr = dev->bus->resource[i]; | |
446 | ||
447 | if (!busr || ((busr->flags ^ devr->flags) & type_mask)) | |
448 | continue; | |
449 | if ((devr->start) && (devr->start >= busr->start) && | |
450 | (devr->end <= busr->end)) | |
451 | return 1; | |
452 | } | |
453 | return 0; | |
454 | } | |
455 | ||
7b9c8ba2 KK |
456 | static void __devinit |
457 | pcibios_fixup_resources(struct pci_dev *dev, int start, int limit) | |
1da177e4 LT |
458 | { |
459 | struct pci_bus_region region; | |
460 | int i; | |
1da177e4 | 461 | |
7b9c8ba2 | 462 | for (i = start; i < limit; i++) { |
1da177e4 LT |
463 | if (!dev->resource[i].flags) |
464 | continue; | |
465 | region.start = dev->resource[i].start; | |
466 | region.end = dev->resource[i].end; | |
467 | pcibios_bus_to_resource(dev, &dev->resource[i], ®ion); | |
71c3511c RS |
468 | if ((is_valid_resource(dev, i))) |
469 | pci_claim_resource(dev, i); | |
1da177e4 LT |
470 | } |
471 | } | |
472 | ||
7b9c8ba2 KK |
473 | static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev) |
474 | { | |
475 | pcibios_fixup_resources(dev, 0, PCI_BRIDGE_RESOURCES); | |
476 | } | |
477 | ||
478 | static void __devinit pcibios_fixup_bridge_resources(struct pci_dev *dev) | |
479 | { | |
480 | pcibios_fixup_resources(dev, PCI_BRIDGE_RESOURCES, PCI_NUM_RESOURCES); | |
481 | } | |
482 | ||
1da177e4 LT |
483 | /* |
484 | * Called after each bus is probed, but before its children are examined. | |
485 | */ | |
486 | void __devinit | |
487 | pcibios_fixup_bus (struct pci_bus *b) | |
488 | { | |
489 | struct pci_dev *dev; | |
490 | ||
f7d473d9 RS |
491 | if (b->self) { |
492 | pci_read_bridge_bases(b); | |
7b9c8ba2 | 493 | pcibios_fixup_bridge_resources(b->self); |
f7d473d9 | 494 | } |
1da177e4 LT |
495 | list_for_each_entry(dev, &b->devices, bus_list) |
496 | pcibios_fixup_device_resources(dev); | |
497 | ||
498 | return; | |
499 | } | |
500 | ||
501 | void __devinit | |
502 | pcibios_update_irq (struct pci_dev *dev, int irq) | |
503 | { | |
504 | pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq); | |
505 | ||
506 | /* ??? FIXME -- record old value for shutdown. */ | |
507 | } | |
508 | ||
509 | static inline int | |
510 | pcibios_enable_resources (struct pci_dev *dev, int mask) | |
511 | { | |
512 | u16 cmd, old_cmd; | |
513 | int idx; | |
514 | struct resource *r; | |
fab3fb0a | 515 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; |
1da177e4 LT |
516 | |
517 | if (!dev) | |
518 | return -EINVAL; | |
519 | ||
520 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
521 | old_cmd = cmd; | |
fab3fb0a | 522 | for (idx=0; idx<PCI_NUM_RESOURCES; idx++) { |
1da177e4 LT |
523 | /* Only set up the desired resources. */ |
524 | if (!(mask & (1 << idx))) | |
525 | continue; | |
526 | ||
527 | r = &dev->resource[idx]; | |
fab3fb0a RS |
528 | if (!(r->flags & type_mask)) |
529 | continue; | |
530 | if ((idx == PCI_ROM_RESOURCE) && | |
531 | (!(r->flags & IORESOURCE_ROM_ENABLE))) | |
532 | continue; | |
1da177e4 LT |
533 | if (!r->start && r->end) { |
534 | printk(KERN_ERR | |
535 | "PCI: Device %s not available because of resource collisions\n", | |
536 | pci_name(dev)); | |
537 | return -EINVAL; | |
538 | } | |
539 | if (r->flags & IORESOURCE_IO) | |
540 | cmd |= PCI_COMMAND_IO; | |
541 | if (r->flags & IORESOURCE_MEM) | |
542 | cmd |= PCI_COMMAND_MEMORY; | |
543 | } | |
1da177e4 LT |
544 | if (cmd != old_cmd) { |
545 | printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd); | |
546 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
547 | } | |
548 | return 0; | |
549 | } | |
550 | ||
551 | int | |
552 | pcibios_enable_device (struct pci_dev *dev, int mask) | |
553 | { | |
554 | int ret; | |
555 | ||
556 | ret = pcibios_enable_resources(dev, mask); | |
557 | if (ret < 0) | |
558 | return ret; | |
559 | ||
560 | return acpi_pci_irq_enable(dev); | |
561 | } | |
562 | ||
1da177e4 LT |
563 | void |
564 | pcibios_disable_device (struct pci_dev *dev) | |
565 | { | |
566 | acpi_pci_irq_disable(dev); | |
567 | } | |
1da177e4 LT |
568 | |
569 | void | |
570 | pcibios_align_resource (void *data, struct resource *res, | |
571 | unsigned long size, unsigned long align) | |
572 | { | |
573 | } | |
574 | ||
575 | /* | |
576 | * PCI BIOS setup, always defaults to SAL interface | |
577 | */ | |
578 | char * __init | |
579 | pcibios_setup (char *str) | |
580 | { | |
ac311ac2 | 581 | return str; |
1da177e4 LT |
582 | } |
583 | ||
584 | int | |
585 | pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma, | |
586 | enum pci_mmap_state mmap_state, int write_combine) | |
587 | { | |
588 | /* | |
589 | * I/O space cannot be accessed via normal processor loads and | |
590 | * stores on this platform. | |
591 | */ | |
592 | if (mmap_state == pci_mmap_io) | |
593 | /* | |
594 | * XXX we could relax this for I/O spaces for which ACPI | |
595 | * indicates that the space is 1-to-1 mapped. But at the | |
596 | * moment, we don't support multiple PCI address spaces and | |
597 | * the legacy I/O space is not 1-to-1 mapped, so this is moot. | |
598 | */ | |
599 | return -EINVAL; | |
600 | ||
601 | /* | |
602 | * Leave vm_pgoff as-is, the PCI space address is the physical | |
603 | * address on this platform. | |
604 | */ | |
1da177e4 LT |
605 | if (write_combine && efi_range_is_wc(vma->vm_start, |
606 | vma->vm_end - vma->vm_start)) | |
607 | vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); | |
608 | else | |
609 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
610 | ||
611 | if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, | |
612 | vma->vm_end - vma->vm_start, vma->vm_page_prot)) | |
613 | return -EAGAIN; | |
614 | ||
615 | return 0; | |
616 | } | |
617 | ||
618 | /** | |
619 | * ia64_pci_get_legacy_mem - generic legacy mem routine | |
620 | * @bus: bus to get legacy memory base address for | |
621 | * | |
622 | * Find the base of legacy memory for @bus. This is typically the first | |
623 | * megabyte of bus address space for @bus or is simply 0 on platforms whose | |
624 | * chipsets support legacy I/O and memory routing. Returns the base address | |
625 | * or an error pointer if an error occurred. | |
626 | * | |
627 | * This is the ia64 generic version of this routine. Other platforms | |
628 | * are free to override it with a machine vector. | |
629 | */ | |
630 | char *ia64_pci_get_legacy_mem(struct pci_bus *bus) | |
631 | { | |
632 | return (char *)__IA64_UNCACHED_OFFSET; | |
633 | } | |
634 | ||
635 | /** | |
636 | * pci_mmap_legacy_page_range - map legacy memory space to userland | |
637 | * @bus: bus whose legacy space we're mapping | |
638 | * @vma: vma passed in by mmap | |
639 | * | |
640 | * Map legacy memory space for this device back to userspace using a machine | |
641 | * vector to get the base address. | |
642 | */ | |
643 | int | |
644 | pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma) | |
645 | { | |
32e62c63 BH |
646 | unsigned long size = vma->vm_end - vma->vm_start; |
647 | pgprot_t prot; | |
1da177e4 LT |
648 | char *addr; |
649 | ||
32e62c63 BH |
650 | /* |
651 | * Avoid attribute aliasing. See Documentation/ia64/aliasing.txt | |
652 | * for more details. | |
653 | */ | |
654 | if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, size)) | |
655 | return -EINVAL; | |
656 | prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size, | |
657 | vma->vm_page_prot); | |
658 | if (pgprot_val(prot) != pgprot_val(pgprot_noncached(vma->vm_page_prot))) | |
659 | return -EINVAL; | |
660 | ||
1da177e4 LT |
661 | addr = pci_get_legacy_mem(bus); |
662 | if (IS_ERR(addr)) | |
663 | return PTR_ERR(addr); | |
664 | ||
665 | vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT; | |
32e62c63 | 666 | vma->vm_page_prot = prot; |
1da177e4 LT |
667 | |
668 | if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, | |
32e62c63 | 669 | size, vma->vm_page_prot)) |
1da177e4 LT |
670 | return -EAGAIN; |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
675 | /** | |
676 | * ia64_pci_legacy_read - read from legacy I/O space | |
677 | * @bus: bus to read | |
678 | * @port: legacy port value | |
679 | * @val: caller allocated storage for returned value | |
680 | * @size: number of bytes to read | |
681 | * | |
682 | * Simply reads @size bytes from @port and puts the result in @val. | |
683 | * | |
684 | * Again, this (and the write routine) are generic versions that can be | |
685 | * overridden by the platform. This is necessary on platforms that don't | |
686 | * support legacy I/O routing or that hard fail on legacy I/O timeouts. | |
687 | */ | |
688 | int ia64_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size) | |
689 | { | |
690 | int ret = size; | |
691 | ||
692 | switch (size) { | |
693 | case 1: | |
694 | *val = inb(port); | |
695 | break; | |
696 | case 2: | |
697 | *val = inw(port); | |
698 | break; | |
699 | case 4: | |
700 | *val = inl(port); | |
701 | break; | |
702 | default: | |
703 | ret = -EINVAL; | |
704 | break; | |
705 | } | |
706 | ||
707 | return ret; | |
708 | } | |
709 | ||
710 | /** | |
711 | * ia64_pci_legacy_write - perform a legacy I/O write | |
712 | * @bus: bus pointer | |
713 | * @port: port to write | |
714 | * @val: value to write | |
715 | * @size: number of bytes to write from @val | |
716 | * | |
717 | * Simply writes @size bytes of @val to @port. | |
718 | */ | |
a72391e4 | 719 | int ia64_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size) |
1da177e4 | 720 | { |
408045af | 721 | int ret = size; |
1da177e4 LT |
722 | |
723 | switch (size) { | |
724 | case 1: | |
725 | outb(val, port); | |
726 | break; | |
727 | case 2: | |
728 | outw(val, port); | |
729 | break; | |
730 | case 4: | |
731 | outl(val, port); | |
732 | break; | |
733 | default: | |
734 | ret = -EINVAL; | |
735 | break; | |
736 | } | |
737 | ||
738 | return ret; | |
739 | } | |
740 | ||
741 | /** | |
742 | * pci_cacheline_size - determine cacheline size for PCI devices | |
743 | * @dev: void | |
744 | * | |
745 | * We want to use the line-size of the outer-most cache. We assume | |
746 | * that this line-size is the same for all CPUs. | |
747 | * | |
748 | * Code mostly taken from arch/ia64/kernel/palinfo.c:cache_info(). | |
749 | * | |
750 | * RETURNS: An appropriate -ERRNO error value on eror, or zero for success. | |
751 | */ | |
752 | static unsigned long | |
753 | pci_cacheline_size (void) | |
754 | { | |
755 | u64 levels, unique_caches; | |
756 | s64 status; | |
757 | pal_cache_config_info_t cci; | |
758 | static u8 cacheline_size; | |
759 | ||
760 | if (cacheline_size) | |
761 | return cacheline_size; | |
762 | ||
763 | status = ia64_pal_cache_summary(&levels, &unique_caches); | |
764 | if (status != 0) { | |
765 | printk(KERN_ERR "%s: ia64_pal_cache_summary() failed (status=%ld)\n", | |
766 | __FUNCTION__, status); | |
767 | return SMP_CACHE_BYTES; | |
768 | } | |
769 | ||
770 | status = ia64_pal_cache_config_info(levels - 1, /* cache_type (data_or_unified)= */ 2, | |
771 | &cci); | |
772 | if (status != 0) { | |
773 | printk(KERN_ERR "%s: ia64_pal_cache_config_info() failed (status=%ld)\n", | |
774 | __FUNCTION__, status); | |
775 | return SMP_CACHE_BYTES; | |
776 | } | |
777 | cacheline_size = 1 << cci.pcci_line_size; | |
778 | return cacheline_size; | |
779 | } | |
780 | ||
781 | /** | |
782 | * pcibios_prep_mwi - helper function for drivers/pci/pci.c:pci_set_mwi() | |
783 | * @dev: the PCI device for which MWI is enabled | |
784 | * | |
785 | * For ia64, we can get the cacheline sizes from PAL. | |
786 | * | |
787 | * RETURNS: An appropriate -ERRNO error value on eror, or zero for success. | |
788 | */ | |
789 | int | |
790 | pcibios_prep_mwi (struct pci_dev *dev) | |
791 | { | |
792 | unsigned long desired_linesize, current_linesize; | |
793 | int rc = 0; | |
794 | u8 pci_linesize; | |
795 | ||
796 | desired_linesize = pci_cacheline_size(); | |
797 | ||
798 | pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &pci_linesize); | |
799 | current_linesize = 4 * pci_linesize; | |
800 | if (desired_linesize != current_linesize) { | |
801 | printk(KERN_WARNING "PCI: slot %s has incorrect PCI cache line size of %lu bytes,", | |
802 | pci_name(dev), current_linesize); | |
803 | if (current_linesize > desired_linesize) { | |
804 | printk(" expected %lu bytes instead\n", desired_linesize); | |
805 | rc = -EINVAL; | |
806 | } else { | |
807 | printk(" correcting to %lu\n", desired_linesize); | |
808 | pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, desired_linesize / 4); | |
809 | } | |
810 | } | |
811 | return rc; | |
812 | } | |
813 | ||
814 | int pci_vector_resources(int last, int nr_released) | |
815 | { | |
816 | int count = nr_released; | |
817 | ||
4f41d5a4 | 818 | count += (IA64_LAST_DEVICE_VECTOR - last); |
1da177e4 LT |
819 | |
820 | return count; | |
821 | } |