2 * pci.c - Low-Level PCI Access in IA-64
4 * Derived from bios32.c of i386 tree.
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.
11 * Note: Above list of copyright holders is incomplete...
14 #include <linux/acpi.h>
15 #include <linux/types.h>
16 #include <linux/kernel.h>
17 #include <linux/pci.h>
18 #include <linux/init.h>
19 #include <linux/ioport.h>
20 #include <linux/slab.h>
21 #include <linux/spinlock.h>
23 #include <asm/machvec.h>
25 #include <asm/system.h>
30 #include <asm/hw_irq.h>
33 * Low-level SAL-based PCI configuration access functions. Note that SAL
34 * calls are already serialized (via sal_lock), so we don't need another
35 * synchronization mechanism here.
38 #define PCI_SAL_ADDRESS(seg, bus, devfn, reg) \
39 (((u64) seg << 24) | (bus << 16) | (devfn << 8) | (reg))
41 /* SAL 3.2 adds support for extended config space. */
43 #define PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg) \
44 (((u64) seg << 28) | (bus << 20) | (devfn << 12) | (reg))
46 int raw_pci_read(unsigned int seg, unsigned int bus, unsigned int devfn,
47 int reg, int len, u32 *value)
52 if (!value || (seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
55 if ((seg | reg) <= 255) {
56 addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
59 addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
62 result = ia64_sal_pci_config_read(addr, mode, len, &data);
70 int raw_pci_write(unsigned int seg, unsigned int bus, unsigned int devfn,
71 int reg, int len, u32 value)
76 if ((seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
79 if ((seg | reg) <= 255) {
80 addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
83 addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
86 result = ia64_sal_pci_config_write(addr, mode, len, value);
92 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
95 return raw_pci_read(pci_domain_nr(bus), bus->number,
96 devfn, where, size, value);
99 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
102 return raw_pci_write(pci_domain_nr(bus), bus->number,
103 devfn, where, size, value);
106 struct pci_ops pci_root_ops = {
111 /* Called by ACPI when it finds a new root bus. */
113 static struct pci_controller * __devinit
114 alloc_pci_controller (int seg)
116 struct pci_controller *controller;
118 controller = kzalloc(sizeof(*controller), GFP_KERNEL);
122 controller->segment = seg;
123 controller->node = -1;
127 struct pci_root_info {
128 struct pci_controller *controller;
133 new_space (u64 phys_base, int sparse)
139 return 0; /* legacy I/O port space */
141 mmio_base = (u64) ioremap(phys_base, 0);
142 for (i = 0; i < num_io_spaces; i++)
143 if (io_space[i].mmio_base == mmio_base &&
144 io_space[i].sparse == sparse)
147 if (num_io_spaces == MAX_IO_SPACES) {
148 printk(KERN_ERR "PCI: Too many IO port spaces "
149 "(MAX_IO_SPACES=%lu)\n", MAX_IO_SPACES);
154 io_space[i].mmio_base = mmio_base;
155 io_space[i].sparse = sparse;
161 add_io_space (struct pci_root_info *info, struct acpi_resource_address64 *addr)
163 struct resource *resource;
165 u64 base, min, max, base_port;
166 unsigned int sparse = 0, space_nr, len;
168 resource = kzalloc(sizeof(*resource), GFP_KERNEL);
170 printk(KERN_ERR "PCI: No memory for %s I/O port space\n",
175 len = strlen(info->name) + 32;
176 name = kzalloc(len, GFP_KERNEL);
178 printk(KERN_ERR "PCI: No memory for %s I/O port space name\n",
184 max = min + addr->address_length - 1;
185 if (addr->info.io.translation_type == ACPI_SPARSE_TRANSLATION)
188 space_nr = new_space(addr->translation_offset, sparse);
192 base = __pa(io_space[space_nr].mmio_base);
193 base_port = IO_SPACE_BASE(space_nr);
194 snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->name,
195 base_port + min, base_port + max);
198 * The SDM guarantees the legacy 0-64K space is sparse, but if the
199 * mapping is done by the processor (not the bridge), ACPI may not
205 resource->name = name;
206 resource->flags = IORESOURCE_MEM;
207 resource->start = base + (sparse ? IO_SPACE_SPARSE_ENCODING(min) : min);
208 resource->end = base + (sparse ? IO_SPACE_SPARSE_ENCODING(max) : max);
209 insert_resource(&iomem_resource, resource);
221 static acpi_status __devinit resource_to_window(struct acpi_resource *resource,
222 struct acpi_resource_address64 *addr)
227 * We're only interested in _CRS descriptors that are
228 * - address space descriptors for memory or I/O space
230 * - producers, i.e., the address space is routed downstream,
231 * not consumed by the bridge itself
233 status = acpi_resource_to_address64(resource, addr);
234 if (ACPI_SUCCESS(status) &&
235 (addr->resource_type == ACPI_MEMORY_RANGE ||
236 addr->resource_type == ACPI_IO_RANGE) &&
237 addr->address_length &&
238 addr->producer_consumer == ACPI_PRODUCER)
244 static acpi_status __devinit
245 count_window (struct acpi_resource *resource, void *data)
247 unsigned int *windows = (unsigned int *) data;
248 struct acpi_resource_address64 addr;
251 status = resource_to_window(resource, &addr);
252 if (ACPI_SUCCESS(status))
258 static __devinit acpi_status add_window(struct acpi_resource *res, void *data)
260 struct pci_root_info *info = data;
261 struct pci_window *window;
262 struct acpi_resource_address64 addr;
264 unsigned long flags, offset = 0;
265 struct resource *root;
267 /* Return AE_OK for non-window resources to keep scanning for more */
268 status = resource_to_window(res, &addr);
269 if (!ACPI_SUCCESS(status))
272 if (addr.resource_type == ACPI_MEMORY_RANGE) {
273 flags = IORESOURCE_MEM;
274 root = &iomem_resource;
275 offset = addr.translation_offset;
276 } else if (addr.resource_type == ACPI_IO_RANGE) {
277 flags = IORESOURCE_IO;
278 root = &ioport_resource;
279 offset = add_io_space(info, &addr);
285 window = &info->controller->window[info->controller->windows++];
286 window->resource.name = info->name;
287 window->resource.flags = flags;
288 window->resource.start = addr.minimum + offset;
289 window->resource.end = window->resource.start + addr.address_length - 1;
290 window->resource.child = NULL;
291 window->offset = offset;
293 if (insert_resource(root, &window->resource)) {
294 printk(KERN_ERR "alloc 0x%lx-0x%lx from %s for %s failed\n",
295 window->resource.start, window->resource.end,
296 root->name, info->name);
302 static void __devinit
303 pcibios_setup_root_windows(struct pci_bus *bus, struct pci_controller *ctrl)
308 for (i = 0; i < ctrl->windows; i++) {
309 struct resource *res = &ctrl->window[i].resource;
310 /* HP's firmware has a hack to work around a Windows bug.
311 * Ignore these tiny memory ranges */
312 if ((res->flags & IORESOURCE_MEM) &&
313 (res->end - res->start < 16))
315 if (j >= PCI_BUS_NUM_RESOURCES) {
316 printk("Ignoring range [%lx-%lx] (%lx)\n", res->start,
317 res->end, res->flags);
320 bus->resource[j++] = res;
324 struct pci_bus * __devinit
325 pci_acpi_scan_root(struct acpi_device *device, int domain, int bus)
327 struct pci_controller *controller;
328 unsigned int windows = 0;
329 struct pci_bus *pbus;
333 controller = alloc_pci_controller(domain);
337 controller->acpi_handle = device->handle;
339 pxm = acpi_get_pxm(controller->acpi_handle);
342 controller->node = pxm_to_node(pxm);
345 acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_window,
348 struct pci_root_info info;
351 kmalloc_node(sizeof(*controller->window) * windows,
352 GFP_KERNEL, controller->node);
353 if (!controller->window)
356 name = kmalloc(16, GFP_KERNEL);
360 sprintf(name, "PCI Bus %04x:%02x", domain, bus);
361 info.controller = controller;
363 acpi_walk_resources(device->handle, METHOD_NAME__CRS,
367 * See arch/x86/pci/acpi.c.
368 * The desired pci bus might already be scanned in a quirk. We
369 * should handle the case here, but it appears that IA64 hasn't
370 * such quirk. So we just ignore the case now.
372 pbus = pci_scan_bus_parented(NULL, bus, &pci_root_ops, controller);
374 pcibios_setup_root_windows(pbus, controller);
379 kfree(controller->window);
386 void pcibios_resource_to_bus(struct pci_dev *dev,
387 struct pci_bus_region *region, struct resource *res)
389 struct pci_controller *controller = PCI_CONTROLLER(dev);
390 unsigned long offset = 0;
393 for (i = 0; i < controller->windows; i++) {
394 struct pci_window *window = &controller->window[i];
395 if (!(window->resource.flags & res->flags))
397 if (window->resource.start > res->start)
399 if (window->resource.end < res->end)
401 offset = window->offset;
405 region->start = res->start - offset;
406 region->end = res->end - offset;
408 EXPORT_SYMBOL(pcibios_resource_to_bus);
410 void pcibios_bus_to_resource(struct pci_dev *dev,
411 struct resource *res, struct pci_bus_region *region)
413 struct pci_controller *controller = PCI_CONTROLLER(dev);
414 unsigned long offset = 0;
417 for (i = 0; i < controller->windows; i++) {
418 struct pci_window *window = &controller->window[i];
419 if (!(window->resource.flags & res->flags))
421 if (window->resource.start - window->offset > region->start)
423 if (window->resource.end - window->offset < region->end)
425 offset = window->offset;
429 res->start = region->start + offset;
430 res->end = region->end + offset;
432 EXPORT_SYMBOL(pcibios_bus_to_resource);
434 static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
436 unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
437 struct resource *devr = &dev->resource[idx];
441 for (i=0; i<PCI_BUS_NUM_RESOURCES; i++) {
442 struct resource *busr = dev->bus->resource[i];
444 if (!busr || ((busr->flags ^ devr->flags) & type_mask))
446 if ((devr->start) && (devr->start >= busr->start) &&
447 (devr->end <= busr->end))
453 static void __devinit
454 pcibios_fixup_resources(struct pci_dev *dev, int start, int limit)
456 struct pci_bus_region region;
459 for (i = start; i < limit; i++) {
460 if (!dev->resource[i].flags)
462 region.start = dev->resource[i].start;
463 region.end = dev->resource[i].end;
464 pcibios_bus_to_resource(dev, &dev->resource[i], ®ion);
465 if ((is_valid_resource(dev, i)))
466 pci_claim_resource(dev, i);
470 void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
472 pcibios_fixup_resources(dev, 0, PCI_BRIDGE_RESOURCES);
474 EXPORT_SYMBOL_GPL(pcibios_fixup_device_resources);
476 static void __devinit pcibios_fixup_bridge_resources(struct pci_dev *dev)
478 pcibios_fixup_resources(dev, PCI_BRIDGE_RESOURCES, PCI_NUM_RESOURCES);
482 * Called after each bus is probed, but before its children are examined.
485 pcibios_fixup_bus (struct pci_bus *b)
490 pci_read_bridge_bases(b);
491 pcibios_fixup_bridge_resources(b->self);
493 list_for_each_entry(dev, &b->devices, bus_list)
494 pcibios_fixup_device_resources(dev);
495 platform_pci_fixup_bus(b);
501 pcibios_update_irq (struct pci_dev *dev, int irq)
503 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
505 /* ??? FIXME -- record old value for shutdown. */
509 pcibios_enable_device (struct pci_dev *dev, int mask)
513 ret = pci_enable_resources(dev, mask);
517 if (!dev->msi_enabled)
518 return acpi_pci_irq_enable(dev);
523 pcibios_disable_device (struct pci_dev *dev)
525 BUG_ON(atomic_read(&dev->enable_cnt));
526 if (!dev->msi_enabled)
527 acpi_pci_irq_disable(dev);
531 pcibios_align_resource (void *data, struct resource *res,
532 resource_size_t size, resource_size_t align)
537 * PCI BIOS setup, always defaults to SAL interface
540 pcibios_setup (char *str)
546 pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
547 enum pci_mmap_state mmap_state, int write_combine)
549 unsigned long size = vma->vm_end - vma->vm_start;
553 * I/O space cannot be accessed via normal processor loads and
554 * stores on this platform.
556 if (mmap_state == pci_mmap_io)
558 * XXX we could relax this for I/O spaces for which ACPI
559 * indicates that the space is 1-to-1 mapped. But at the
560 * moment, we don't support multiple PCI address spaces and
561 * the legacy I/O space is not 1-to-1 mapped, so this is moot.
565 if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
568 prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
572 * If the user requested WC, the kernel uses UC or WC for this region,
573 * and the chipset supports WC, we can use WC. Otherwise, we have to
574 * use the same attribute the kernel uses.
577 ((pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_UC ||
578 (pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_WC) &&
579 efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
580 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
582 vma->vm_page_prot = prot;
584 if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
585 vma->vm_end - vma->vm_start, vma->vm_page_prot))
592 * ia64_pci_get_legacy_mem - generic legacy mem routine
593 * @bus: bus to get legacy memory base address for
595 * Find the base of legacy memory for @bus. This is typically the first
596 * megabyte of bus address space for @bus or is simply 0 on platforms whose
597 * chipsets support legacy I/O and memory routing. Returns the base address
598 * or an error pointer if an error occurred.
600 * This is the ia64 generic version of this routine. Other platforms
601 * are free to override it with a machine vector.
603 char *ia64_pci_get_legacy_mem(struct pci_bus *bus)
605 return (char *)__IA64_UNCACHED_OFFSET;
609 * pci_mmap_legacy_page_range - map legacy memory space to userland
610 * @bus: bus whose legacy space we're mapping
611 * @vma: vma passed in by mmap
613 * Map legacy memory space for this device back to userspace using a machine
614 * vector to get the base address.
617 pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
618 enum pci_mmap_state mmap_state)
620 unsigned long size = vma->vm_end - vma->vm_start;
624 /* We only support mmap'ing of legacy memory space */
625 if (mmap_state != pci_mmap_mem)
629 * Avoid attribute aliasing. See Documentation/ia64/aliasing.txt
632 if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
634 prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
637 addr = pci_get_legacy_mem(bus);
639 return PTR_ERR(addr);
641 vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT;
642 vma->vm_page_prot = prot;
644 if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
645 size, vma->vm_page_prot))
652 * ia64_pci_legacy_read - read from legacy I/O space
654 * @port: legacy port value
655 * @val: caller allocated storage for returned value
656 * @size: number of bytes to read
658 * Simply reads @size bytes from @port and puts the result in @val.
660 * Again, this (and the write routine) are generic versions that can be
661 * overridden by the platform. This is necessary on platforms that don't
662 * support legacy I/O routing or that hard fail on legacy I/O timeouts.
664 int ia64_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size)
687 * ia64_pci_legacy_write - perform a legacy I/O write
689 * @port: port to write
690 * @val: value to write
691 * @size: number of bytes to write from @val
693 * Simply writes @size bytes of @val to @port.
695 int ia64_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size)
717 /* It's defined in drivers/pci/pci.c */
718 extern u8 pci_cache_line_size;
721 * set_pci_cacheline_size - determine cacheline size for PCI devices
723 * We want to use the line-size of the outer-most cache. We assume
724 * that this line-size is the same for all CPUs.
726 * Code mostly taken from arch/ia64/kernel/palinfo.c:cache_info().
728 static void __init set_pci_cacheline_size(void)
730 u64 levels, unique_caches;
732 pal_cache_config_info_t cci;
734 status = ia64_pal_cache_summary(&levels, &unique_caches);
736 printk(KERN_ERR "%s: ia64_pal_cache_summary() failed "
737 "(status=%ld)\n", __func__, status);
741 status = ia64_pal_cache_config_info(levels - 1,
742 /* cache_type (data_or_unified)= */ 2, &cci);
744 printk(KERN_ERR "%s: ia64_pal_cache_config_info() failed "
745 "(status=%ld)\n", __func__, status);
748 pci_cache_line_size = (1 << cci.pcci_line_size) / 4;
751 static int __init pcibios_init(void)
753 set_pci_cacheline_size();
757 subsys_initcall(pcibios_init);