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>
22 #include <linux/bootmem.h>
23 #include <linux/export.h>
25 #include <asm/machvec.h>
31 #include <asm/hw_irq.h>
34 * Low-level SAL-based PCI configuration access functions. Note that SAL
35 * calls are already serialized (via sal_lock), so we don't need another
36 * synchronization mechanism here.
39 #define PCI_SAL_ADDRESS(seg, bus, devfn, reg) \
40 (((u64) seg << 24) | (bus << 16) | (devfn << 8) | (reg))
42 /* SAL 3.2 adds support for extended config space. */
44 #define PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg) \
45 (((u64) seg << 28) | (bus << 20) | (devfn << 12) | (reg))
47 int raw_pci_read(unsigned int seg, unsigned int bus, unsigned int devfn,
48 int reg, int len, u32 *value)
53 if (!value || (seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
56 if ((seg | reg) <= 255) {
57 addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
59 } else if (sal_revision >= SAL_VERSION_CODE(3,2)) {
60 addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
66 result = ia64_sal_pci_config_read(addr, mode, len, &data);
74 int raw_pci_write(unsigned int seg, unsigned int bus, unsigned int devfn,
75 int reg, int len, u32 value)
80 if ((seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
83 if ((seg | reg) <= 255) {
84 addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
86 } else if (sal_revision >= SAL_VERSION_CODE(3,2)) {
87 addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
92 result = ia64_sal_pci_config_write(addr, mode, len, value);
98 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
101 return raw_pci_read(pci_domain_nr(bus), bus->number,
102 devfn, where, size, value);
105 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
108 return raw_pci_write(pci_domain_nr(bus), bus->number,
109 devfn, where, size, value);
112 struct pci_ops pci_root_ops = {
117 /* Called by ACPI when it finds a new root bus. */
119 static struct pci_controller * __devinit
120 alloc_pci_controller (int seg)
122 struct pci_controller *controller;
124 controller = kzalloc(sizeof(*controller), GFP_KERNEL);
128 controller->segment = seg;
129 controller->node = -1;
133 struct pci_root_info {
134 struct acpi_device *bridge;
135 struct pci_controller *controller;
136 struct list_head resources;
141 new_space (u64 phys_base, int sparse)
147 return 0; /* legacy I/O port space */
149 mmio_base = (u64) ioremap(phys_base, 0);
150 for (i = 0; i < num_io_spaces; i++)
151 if (io_space[i].mmio_base == mmio_base &&
152 io_space[i].sparse == sparse)
155 if (num_io_spaces == MAX_IO_SPACES) {
156 printk(KERN_ERR "PCI: Too many IO port spaces "
157 "(MAX_IO_SPACES=%lu)\n", MAX_IO_SPACES);
162 io_space[i].mmio_base = mmio_base;
163 io_space[i].sparse = sparse;
169 add_io_space (struct pci_root_info *info, struct acpi_resource_address64 *addr)
171 struct resource *resource;
173 unsigned long base, min, max, base_port;
174 unsigned int sparse = 0, space_nr, len;
176 resource = kzalloc(sizeof(*resource), GFP_KERNEL);
178 printk(KERN_ERR "PCI: No memory for %s I/O port space\n",
183 len = strlen(info->name) + 32;
184 name = kzalloc(len, GFP_KERNEL);
186 printk(KERN_ERR "PCI: No memory for %s I/O port space name\n",
192 max = min + addr->address_length - 1;
193 if (addr->info.io.translation_type == ACPI_SPARSE_TRANSLATION)
196 space_nr = new_space(addr->translation_offset, sparse);
200 base = __pa(io_space[space_nr].mmio_base);
201 base_port = IO_SPACE_BASE(space_nr);
202 snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->name,
203 base_port + min, base_port + max);
206 * The SDM guarantees the legacy 0-64K space is sparse, but if the
207 * mapping is done by the processor (not the bridge), ACPI may not
213 resource->name = name;
214 resource->flags = IORESOURCE_MEM;
215 resource->start = base + (sparse ? IO_SPACE_SPARSE_ENCODING(min) : min);
216 resource->end = base + (sparse ? IO_SPACE_SPARSE_ENCODING(max) : max);
217 insert_resource(&iomem_resource, resource);
229 static acpi_status __devinit resource_to_window(struct acpi_resource *resource,
230 struct acpi_resource_address64 *addr)
235 * We're only interested in _CRS descriptors that are
236 * - address space descriptors for memory or I/O space
238 * - producers, i.e., the address space is routed downstream,
239 * not consumed by the bridge itself
241 status = acpi_resource_to_address64(resource, addr);
242 if (ACPI_SUCCESS(status) &&
243 (addr->resource_type == ACPI_MEMORY_RANGE ||
244 addr->resource_type == ACPI_IO_RANGE) &&
245 addr->address_length &&
246 addr->producer_consumer == ACPI_PRODUCER)
252 static acpi_status __devinit
253 count_window (struct acpi_resource *resource, void *data)
255 unsigned int *windows = (unsigned int *) data;
256 struct acpi_resource_address64 addr;
259 status = resource_to_window(resource, &addr);
260 if (ACPI_SUCCESS(status))
266 static __devinit acpi_status add_window(struct acpi_resource *res, void *data)
268 struct pci_root_info *info = data;
269 struct pci_window *window;
270 struct acpi_resource_address64 addr;
272 unsigned long flags, offset = 0;
273 struct resource *root;
275 /* Return AE_OK for non-window resources to keep scanning for more */
276 status = resource_to_window(res, &addr);
277 if (!ACPI_SUCCESS(status))
280 if (addr.resource_type == ACPI_MEMORY_RANGE) {
281 flags = IORESOURCE_MEM;
282 root = &iomem_resource;
283 offset = addr.translation_offset;
284 } else if (addr.resource_type == ACPI_IO_RANGE) {
285 flags = IORESOURCE_IO;
286 root = &ioport_resource;
287 offset = add_io_space(info, &addr);
293 window = &info->controller->window[info->controller->windows++];
294 window->resource.name = info->name;
295 window->resource.flags = flags;
296 window->resource.start = addr.minimum + offset;
297 window->resource.end = window->resource.start + addr.address_length - 1;
298 window->resource.child = NULL;
299 window->offset = offset;
301 if (insert_resource(root, &window->resource)) {
302 dev_err(&info->bridge->dev,
303 "can't allocate host bridge window %pR\n",
307 dev_info(&info->bridge->dev, "host bridge window %pR "
308 "(PCI address [%#llx-%#llx])\n",
310 window->resource.start - offset,
311 window->resource.end - offset);
313 dev_info(&info->bridge->dev,
314 "host bridge window %pR\n",
318 /* HP's firmware has a hack to work around a Windows bug.
319 * Ignore these tiny memory ranges */
320 if (!((window->resource.flags & IORESOURCE_MEM) &&
321 (window->resource.end - window->resource.start < 16)))
322 pci_add_resource(&info->resources, &window->resource);
327 struct pci_bus * __devinit
328 pci_acpi_scan_root(struct acpi_pci_root *root)
330 struct acpi_device *device = root->device;
331 int domain = root->segment;
332 int bus = root->secondary.start;
333 struct pci_controller *controller;
334 unsigned int windows = 0;
335 struct pci_root_info info;
336 struct pci_bus *pbus;
340 controller = alloc_pci_controller(domain);
344 controller->acpi_handle = device->handle;
346 pxm = acpi_get_pxm(controller->acpi_handle);
349 controller->node = pxm_to_node(pxm);
352 INIT_LIST_HEAD(&info.resources);
353 acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_window,
357 kmalloc_node(sizeof(*controller->window) * windows,
358 GFP_KERNEL, controller->node);
359 if (!controller->window)
362 name = kmalloc(16, GFP_KERNEL);
366 sprintf(name, "PCI Bus %04x:%02x", domain, bus);
367 info.bridge = device;
368 info.controller = controller;
370 acpi_walk_resources(device->handle, METHOD_NAME__CRS,
374 * See arch/x86/pci/acpi.c.
375 * The desired pci bus might already be scanned in a quirk. We
376 * should handle the case here, but it appears that IA64 hasn't
377 * such quirk. So we just ignore the case now.
379 pbus = pci_create_root_bus(NULL, bus, &pci_root_ops, controller,
382 pci_free_resource_list(&info.resources);
386 pbus->subordinate = pci_scan_child_bus(pbus);
390 kfree(controller->window);
397 void pcibios_resource_to_bus(struct pci_dev *dev,
398 struct pci_bus_region *region, struct resource *res)
400 struct pci_controller *controller = PCI_CONTROLLER(dev);
401 unsigned long offset = 0;
404 for (i = 0; i < controller->windows; i++) {
405 struct pci_window *window = &controller->window[i];
406 if (!(window->resource.flags & res->flags))
408 if (window->resource.start > res->start)
410 if (window->resource.end < res->end)
412 offset = window->offset;
416 region->start = res->start - offset;
417 region->end = res->end - offset;
419 EXPORT_SYMBOL(pcibios_resource_to_bus);
421 void pcibios_bus_to_resource(struct pci_dev *dev,
422 struct resource *res, struct pci_bus_region *region)
424 struct pci_controller *controller = PCI_CONTROLLER(dev);
425 unsigned long offset = 0;
428 for (i = 0; i < controller->windows; i++) {
429 struct pci_window *window = &controller->window[i];
430 if (!(window->resource.flags & res->flags))
432 if (window->resource.start - window->offset > region->start)
434 if (window->resource.end - window->offset < region->end)
436 offset = window->offset;
440 res->start = region->start + offset;
441 res->end = region->end + offset;
443 EXPORT_SYMBOL(pcibios_bus_to_resource);
445 static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
447 unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
448 struct resource *devr = &dev->resource[idx], *busr;
453 pci_bus_for_each_resource(dev->bus, busr, i) {
454 if (!busr || ((busr->flags ^ devr->flags) & type_mask))
456 if ((devr->start) && (devr->start >= busr->start) &&
457 (devr->end <= busr->end))
463 static void __devinit
464 pcibios_fixup_resources(struct pci_dev *dev, int start, int limit)
466 struct pci_bus_region region;
469 for (i = start; i < limit; i++) {
470 if (!dev->resource[i].flags)
472 region.start = dev->resource[i].start;
473 region.end = dev->resource[i].end;
474 pcibios_bus_to_resource(dev, &dev->resource[i], ®ion);
475 if ((is_valid_resource(dev, i)))
476 pci_claim_resource(dev, i);
480 void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
482 pcibios_fixup_resources(dev, 0, PCI_BRIDGE_RESOURCES);
484 EXPORT_SYMBOL_GPL(pcibios_fixup_device_resources);
486 static void __devinit pcibios_fixup_bridge_resources(struct pci_dev *dev)
488 pcibios_fixup_resources(dev, PCI_BRIDGE_RESOURCES, PCI_NUM_RESOURCES);
492 * Called after each bus is probed, but before its children are examined.
495 pcibios_fixup_bus (struct pci_bus *b)
500 pci_read_bridge_bases(b);
501 pcibios_fixup_bridge_resources(b->self);
503 list_for_each_entry(dev, &b->devices, bus_list)
504 pcibios_fixup_device_resources(dev);
505 platform_pci_fixup_bus(b);
508 void pcibios_set_master (struct pci_dev *dev)
510 /* No special bus mastering setup handling */
514 pcibios_update_irq (struct pci_dev *dev, int irq)
516 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
518 /* ??? FIXME -- record old value for shutdown. */
522 pcibios_enable_device (struct pci_dev *dev, int mask)
526 ret = pci_enable_resources(dev, mask);
530 if (!dev->msi_enabled)
531 return acpi_pci_irq_enable(dev);
536 pcibios_disable_device (struct pci_dev *dev)
538 BUG_ON(atomic_read(&dev->enable_cnt));
539 if (!dev->msi_enabled)
540 acpi_pci_irq_disable(dev);
544 pcibios_align_resource (void *data, const struct resource *res,
545 resource_size_t size, resource_size_t align)
551 * PCI BIOS setup, always defaults to SAL interface
554 pcibios_setup (char *str)
560 pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
561 enum pci_mmap_state mmap_state, int write_combine)
563 unsigned long size = vma->vm_end - vma->vm_start;
567 * I/O space cannot be accessed via normal processor loads and
568 * stores on this platform.
570 if (mmap_state == pci_mmap_io)
572 * XXX we could relax this for I/O spaces for which ACPI
573 * indicates that the space is 1-to-1 mapped. But at the
574 * moment, we don't support multiple PCI address spaces and
575 * the legacy I/O space is not 1-to-1 mapped, so this is moot.
579 if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
582 prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
586 * If the user requested WC, the kernel uses UC or WC for this region,
587 * and the chipset supports WC, we can use WC. Otherwise, we have to
588 * use the same attribute the kernel uses.
591 ((pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_UC ||
592 (pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_WC) &&
593 efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
594 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
596 vma->vm_page_prot = prot;
598 if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
599 vma->vm_end - vma->vm_start, vma->vm_page_prot))
606 * ia64_pci_get_legacy_mem - generic legacy mem routine
607 * @bus: bus to get legacy memory base address for
609 * Find the base of legacy memory for @bus. This is typically the first
610 * megabyte of bus address space for @bus or is simply 0 on platforms whose
611 * chipsets support legacy I/O and memory routing. Returns the base address
612 * or an error pointer if an error occurred.
614 * This is the ia64 generic version of this routine. Other platforms
615 * are free to override it with a machine vector.
617 char *ia64_pci_get_legacy_mem(struct pci_bus *bus)
619 return (char *)__IA64_UNCACHED_OFFSET;
623 * pci_mmap_legacy_page_range - map legacy memory space to userland
624 * @bus: bus whose legacy space we're mapping
625 * @vma: vma passed in by mmap
627 * Map legacy memory space for this device back to userspace using a machine
628 * vector to get the base address.
631 pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
632 enum pci_mmap_state mmap_state)
634 unsigned long size = vma->vm_end - vma->vm_start;
638 /* We only support mmap'ing of legacy memory space */
639 if (mmap_state != pci_mmap_mem)
643 * Avoid attribute aliasing. See Documentation/ia64/aliasing.txt
646 if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
648 prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
651 addr = pci_get_legacy_mem(bus);
653 return PTR_ERR(addr);
655 vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT;
656 vma->vm_page_prot = prot;
658 if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
659 size, vma->vm_page_prot))
666 * ia64_pci_legacy_read - read from legacy I/O space
668 * @port: legacy port value
669 * @val: caller allocated storage for returned value
670 * @size: number of bytes to read
672 * Simply reads @size bytes from @port and puts the result in @val.
674 * Again, this (and the write routine) are generic versions that can be
675 * overridden by the platform. This is necessary on platforms that don't
676 * support legacy I/O routing or that hard fail on legacy I/O timeouts.
678 int ia64_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size)
701 * ia64_pci_legacy_write - perform a legacy I/O write
703 * @port: port to write
704 * @val: value to write
705 * @size: number of bytes to write from @val
707 * Simply writes @size bytes of @val to @port.
709 int ia64_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size)
732 * set_pci_cacheline_size - determine cacheline size for PCI devices
734 * We want to use the line-size of the outer-most cache. We assume
735 * that this line-size is the same for all CPUs.
737 * Code mostly taken from arch/ia64/kernel/palinfo.c:cache_info().
739 static void __init set_pci_dfl_cacheline_size(void)
741 unsigned long levels, unique_caches;
743 pal_cache_config_info_t cci;
745 status = ia64_pal_cache_summary(&levels, &unique_caches);
747 printk(KERN_ERR "%s: ia64_pal_cache_summary() failed "
748 "(status=%ld)\n", __func__, status);
752 status = ia64_pal_cache_config_info(levels - 1,
753 /* cache_type (data_or_unified)= */ 2, &cci);
755 printk(KERN_ERR "%s: ia64_pal_cache_config_info() failed "
756 "(status=%ld)\n", __func__, status);
759 pci_dfl_cache_line_size = (1 << cci.pcci_line_size) / 4;
762 u64 ia64_dma_get_required_mask(struct device *dev)
764 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
765 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
768 if (!high_totalram) {
769 /* convert to mask just covering totalram */
770 low_totalram = (1 << (fls(low_totalram) - 1));
771 low_totalram += low_totalram - 1;
774 high_totalram = (1 << (fls(high_totalram) - 1));
775 high_totalram += high_totalram - 1;
776 mask = (((u64)high_totalram) << 32) + 0xffffffff;
780 EXPORT_SYMBOL_GPL(ia64_dma_get_required_mask);
782 u64 dma_get_required_mask(struct device *dev)
784 return platform_dma_get_required_mask(dev);
786 EXPORT_SYMBOL_GPL(dma_get_required_mask);
788 static int __init pcibios_init(void)
790 set_pci_dfl_cacheline_size();
794 subsys_initcall(pcibios_init);