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...
13 #include <linux/config.h>
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>
25 #include <asm/machvec.h>
27 #include <asm/system.h>
32 #include <asm/hw_irq.h>
36 * Low-level SAL-based PCI configuration access functions. Note that SAL
37 * calls are already serialized (via sal_lock), so we don't need another
38 * synchronization mechanism here.
41 #define PCI_SAL_ADDRESS(seg, bus, devfn, reg) \
42 (((u64) seg << 24) | (bus << 16) | (devfn << 8) | (reg))
44 /* SAL 3.2 adds support for extended config space. */
46 #define PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg) \
47 (((u64) seg << 28) | (bus << 20) | (devfn << 12) | (reg))
50 pci_sal_read (unsigned int seg, unsigned int bus, unsigned int devfn,
51 int reg, int len, u32 *value)
56 if (!value || (seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
59 if ((seg | reg) <= 255) {
60 addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
63 addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
66 result = ia64_sal_pci_config_read(addr, mode, len, &data);
75 pci_sal_write (unsigned int seg, unsigned int bus, unsigned int devfn,
76 int reg, int len, u32 value)
81 if ((seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
84 if ((seg | reg) <= 255) {
85 addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
88 addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
91 result = ia64_sal_pci_config_write(addr, mode, len, value);
97 static struct pci_raw_ops pci_sal_ops = {
99 .write = pci_sal_write
102 struct pci_raw_ops *raw_pci_ops = &pci_sal_ops;
105 pci_read (struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
107 return raw_pci_ops->read(pci_domain_nr(bus), bus->number,
108 devfn, where, size, value);
112 pci_write (struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
114 return raw_pci_ops->write(pci_domain_nr(bus), bus->number,
115 devfn, where, size, value);
118 struct pci_ops pci_root_ops = {
123 /* Called by ACPI when it finds a new root bus. */
125 static struct pci_controller * __devinit
126 alloc_pci_controller (int seg)
128 struct pci_controller *controller;
130 controller = kmalloc(sizeof(*controller), GFP_KERNEL);
134 memset(controller, 0, sizeof(*controller));
135 controller->segment = seg;
136 controller->node = -1;
140 struct pci_root_info {
141 struct pci_controller *controller;
146 new_space (u64 phys_base, int sparse)
152 return 0; /* legacy I/O port space */
154 mmio_base = (u64) ioremap(phys_base, 0);
155 for (i = 0; i < num_io_spaces; i++)
156 if (io_space[i].mmio_base == mmio_base &&
157 io_space[i].sparse == sparse)
160 if (num_io_spaces == MAX_IO_SPACES) {
161 printk(KERN_ERR "PCI: Too many IO port spaces "
162 "(MAX_IO_SPACES=%lu)\n", MAX_IO_SPACES);
167 io_space[i].mmio_base = mmio_base;
168 io_space[i].sparse = sparse;
174 add_io_space (struct pci_root_info *info, struct acpi_resource_address64 *addr)
176 struct resource *resource;
178 u64 base, min, max, base_port;
179 unsigned int sparse = 0, space_nr, len;
181 resource = kzalloc(sizeof(*resource), GFP_KERNEL);
183 printk(KERN_ERR "PCI: No memory for %s I/O port space\n",
188 len = strlen(info->name) + 32;
189 name = kzalloc(len, GFP_KERNEL);
191 printk(KERN_ERR "PCI: No memory for %s I/O port space name\n",
196 min = addr->min_address_range;
197 max = min + addr->address_length - 1;
198 if (addr->attribute.io.translation_attribute == ACPI_SPARSE_TRANSLATION)
201 space_nr = new_space(addr->address_translation_offset, sparse);
205 base = __pa(io_space[space_nr].mmio_base);
206 base_port = IO_SPACE_BASE(space_nr);
207 snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->name,
208 base_port + min, base_port + max);
211 * The SDM guarantees the legacy 0-64K space is sparse, but if the
212 * mapping is done by the processor (not the bridge), ACPI may not
218 resource->name = name;
219 resource->flags = IORESOURCE_MEM;
220 resource->start = base + (sparse ? IO_SPACE_SPARSE_ENCODING(min) : min);
221 resource->end = base + (sparse ? IO_SPACE_SPARSE_ENCODING(max) : max);
222 insert_resource(&iomem_resource, resource);
234 static acpi_status __devinit resource_to_window(struct acpi_resource *resource,
235 struct acpi_resource_address64 *addr)
240 * We're only interested in _CRS descriptors that are
241 * - address space descriptors for memory or I/O space
243 * - producers, i.e., the address space is routed downstream,
244 * not consumed by the bridge itself
246 status = acpi_resource_to_address64(resource, addr);
247 if (ACPI_SUCCESS(status) &&
248 (addr->resource_type == ACPI_MEMORY_RANGE ||
249 addr->resource_type == ACPI_IO_RANGE) &&
250 addr->address_length &&
251 addr->producer_consumer == ACPI_PRODUCER)
257 static acpi_status __devinit
258 count_window (struct acpi_resource *resource, void *data)
260 unsigned int *windows = (unsigned int *) data;
261 struct acpi_resource_address64 addr;
264 status = resource_to_window(resource, &addr);
265 if (ACPI_SUCCESS(status))
271 static __devinit acpi_status add_window(struct acpi_resource *res, void *data)
273 struct pci_root_info *info = data;
274 struct pci_window *window;
275 struct acpi_resource_address64 addr;
277 unsigned long flags, offset = 0;
278 struct resource *root;
280 /* Return AE_OK for non-window resources to keep scanning for more */
281 status = resource_to_window(res, &addr);
282 if (!ACPI_SUCCESS(status))
285 if (addr.resource_type == ACPI_MEMORY_RANGE) {
286 flags = IORESOURCE_MEM;
287 root = &iomem_resource;
288 offset = addr.address_translation_offset;
289 } else if (addr.resource_type == ACPI_IO_RANGE) {
290 flags = IORESOURCE_IO;
291 root = &ioport_resource;
292 offset = add_io_space(info, &addr);
298 window = &info->controller->window[info->controller->windows++];
299 window->resource.name = info->name;
300 window->resource.flags = flags;
301 window->resource.start = addr.min_address_range + offset;
302 window->resource.end = window->resource.start + addr.address_length - 1;
303 window->resource.child = NULL;
304 window->offset = offset;
306 if (insert_resource(root, &window->resource)) {
307 printk(KERN_ERR "alloc 0x%lx-0x%lx from %s for %s failed\n",
308 window->resource.start, window->resource.end,
309 root->name, info->name);
315 static void __devinit
316 pcibios_setup_root_windows(struct pci_bus *bus, struct pci_controller *ctrl)
321 for (i = 0; i < ctrl->windows; i++) {
322 struct resource *res = &ctrl->window[i].resource;
323 /* HP's firmware has a hack to work around a Windows bug.
324 * Ignore these tiny memory ranges */
325 if ((res->flags & IORESOURCE_MEM) &&
326 (res->end - res->start < 16))
328 if (j >= PCI_BUS_NUM_RESOURCES) {
329 printk("Ignoring range [%lx-%lx] (%lx)\n", res->start,
330 res->end, res->flags);
333 bus->resource[j++] = res;
337 struct pci_bus * __devinit
338 pci_acpi_scan_root(struct acpi_device *device, int domain, int bus)
340 struct pci_root_info info;
341 struct pci_controller *controller;
342 unsigned int windows = 0;
343 struct pci_bus *pbus;
347 controller = alloc_pci_controller(domain);
351 controller->acpi_handle = device->handle;
353 pxm = acpi_get_pxm(controller->acpi_handle);
356 controller->node = pxm_to_nid_map[pxm];
359 acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_window,
361 controller->window = kmalloc_node(sizeof(*controller->window) * windows,
362 GFP_KERNEL, controller->node);
363 if (!controller->window)
366 name = kmalloc(16, GFP_KERNEL);
370 sprintf(name, "PCI Bus %04x:%02x", domain, bus);
371 info.controller = controller;
373 acpi_walk_resources(device->handle, METHOD_NAME__CRS, add_window,
376 pbus = pci_scan_bus_parented(NULL, bus, &pci_root_ops, controller);
378 pcibios_setup_root_windows(pbus, controller);
383 kfree(controller->window);
390 void pcibios_resource_to_bus(struct pci_dev *dev,
391 struct pci_bus_region *region, struct resource *res)
393 struct pci_controller *controller = PCI_CONTROLLER(dev);
394 unsigned long offset = 0;
397 for (i = 0; i < controller->windows; i++) {
398 struct pci_window *window = &controller->window[i];
399 if (!(window->resource.flags & res->flags))
401 if (window->resource.start > res->start)
403 if (window->resource.end < res->end)
405 offset = window->offset;
409 region->start = res->start - offset;
410 region->end = res->end - offset;
412 EXPORT_SYMBOL(pcibios_resource_to_bus);
414 void pcibios_bus_to_resource(struct pci_dev *dev,
415 struct resource *res, struct pci_bus_region *region)
417 struct pci_controller *controller = PCI_CONTROLLER(dev);
418 unsigned long offset = 0;
421 for (i = 0; i < controller->windows; i++) {
422 struct pci_window *window = &controller->window[i];
423 if (!(window->resource.flags & res->flags))
425 if (window->resource.start - window->offset > region->start)
427 if (window->resource.end - window->offset < region->end)
429 offset = window->offset;
433 res->start = region->start + offset;
434 res->end = region->end + offset;
436 EXPORT_SYMBOL(pcibios_bus_to_resource);
438 static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
440 unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
441 struct resource *devr = &dev->resource[idx];
445 for (i=0; i<PCI_BUS_NUM_RESOURCES; i++) {
446 struct resource *busr = dev->bus->resource[i];
448 if (!busr || ((busr->flags ^ devr->flags) & type_mask))
450 if ((devr->start) && (devr->start >= busr->start) &&
451 (devr->end <= busr->end))
457 static void __devinit
458 pcibios_fixup_resources(struct pci_dev *dev, int start, int limit)
460 struct pci_bus_region region;
463 for (i = start; i < limit; i++) {
464 if (!dev->resource[i].flags)
466 region.start = dev->resource[i].start;
467 region.end = dev->resource[i].end;
468 pcibios_bus_to_resource(dev, &dev->resource[i], ®ion);
469 if ((is_valid_resource(dev, i)))
470 pci_claim_resource(dev, i);
474 static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
476 pcibios_fixup_resources(dev, 0, PCI_BRIDGE_RESOURCES);
479 static void __devinit pcibios_fixup_bridge_resources(struct pci_dev *dev)
481 pcibios_fixup_resources(dev, PCI_BRIDGE_RESOURCES, PCI_NUM_RESOURCES);
485 * Called after each bus is probed, but before its children are examined.
488 pcibios_fixup_bus (struct pci_bus *b)
493 pci_read_bridge_bases(b);
494 pcibios_fixup_bridge_resources(b->self);
496 list_for_each_entry(dev, &b->devices, bus_list)
497 pcibios_fixup_device_resources(dev);
503 pcibios_update_irq (struct pci_dev *dev, int irq)
505 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
507 /* ??? FIXME -- record old value for shutdown. */
511 pcibios_enable_resources (struct pci_dev *dev, int mask)
516 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
521 pci_read_config_word(dev, PCI_COMMAND, &cmd);
523 for (idx=0; idx<PCI_NUM_RESOURCES; idx++) {
524 /* Only set up the desired resources. */
525 if (!(mask & (1 << idx)))
528 r = &dev->resource[idx];
529 if (!(r->flags & type_mask))
531 if ((idx == PCI_ROM_RESOURCE) &&
532 (!(r->flags & IORESOURCE_ROM_ENABLE)))
534 if (!r->start && r->end) {
536 "PCI: Device %s not available because of resource collisions\n",
540 if (r->flags & IORESOURCE_IO)
541 cmd |= PCI_COMMAND_IO;
542 if (r->flags & IORESOURCE_MEM)
543 cmd |= PCI_COMMAND_MEMORY;
545 if (cmd != old_cmd) {
546 printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
547 pci_write_config_word(dev, PCI_COMMAND, cmd);
553 pcibios_enable_device (struct pci_dev *dev, int mask)
557 ret = pcibios_enable_resources(dev, mask);
561 return acpi_pci_irq_enable(dev);
565 pcibios_disable_device (struct pci_dev *dev)
567 acpi_pci_irq_disable(dev);
571 pcibios_align_resource (void *data, struct resource *res,
572 unsigned long size, unsigned long align)
577 * PCI BIOS setup, always defaults to SAL interface
580 pcibios_setup (char *str)
586 pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
587 enum pci_mmap_state mmap_state, int write_combine)
590 * I/O space cannot be accessed via normal processor loads and
591 * stores on this platform.
593 if (mmap_state == pci_mmap_io)
595 * XXX we could relax this for I/O spaces for which ACPI
596 * indicates that the space is 1-to-1 mapped. But at the
597 * moment, we don't support multiple PCI address spaces and
598 * the legacy I/O space is not 1-to-1 mapped, so this is moot.
603 * Leave vm_pgoff as-is, the PCI space address is the physical
604 * address on this platform.
606 vma->vm_flags |= (VM_SHM | VM_RESERVED | VM_IO);
608 if (write_combine && efi_range_is_wc(vma->vm_start,
609 vma->vm_end - vma->vm_start))
610 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
612 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
614 if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
615 vma->vm_end - vma->vm_start, vma->vm_page_prot))
622 * ia64_pci_get_legacy_mem - generic legacy mem routine
623 * @bus: bus to get legacy memory base address for
625 * Find the base of legacy memory for @bus. This is typically the first
626 * megabyte of bus address space for @bus or is simply 0 on platforms whose
627 * chipsets support legacy I/O and memory routing. Returns the base address
628 * or an error pointer if an error occurred.
630 * This is the ia64 generic version of this routine. Other platforms
631 * are free to override it with a machine vector.
633 char *ia64_pci_get_legacy_mem(struct pci_bus *bus)
635 return (char *)__IA64_UNCACHED_OFFSET;
639 * pci_mmap_legacy_page_range - map legacy memory space to userland
640 * @bus: bus whose legacy space we're mapping
641 * @vma: vma passed in by mmap
643 * Map legacy memory space for this device back to userspace using a machine
644 * vector to get the base address.
647 pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma)
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 = pgprot_noncached(vma->vm_page_prot);
657 vma->vm_flags |= (VM_SHM | VM_RESERVED | VM_IO);
659 if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
660 vma->vm_end - vma->vm_start, vma->vm_page_prot))
667 * ia64_pci_legacy_read - read from legacy I/O space
669 * @port: legacy port value
670 * @val: caller allocated storage for returned value
671 * @size: number of bytes to read
673 * Simply reads @size bytes from @port and puts the result in @val.
675 * Again, this (and the write routine) are generic versions that can be
676 * overridden by the platform. This is necessary on platforms that don't
677 * support legacy I/O routing or that hard fail on legacy I/O timeouts.
679 int ia64_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size)
702 * ia64_pci_legacy_write - perform a legacy I/O write
704 * @port: port to write
705 * @val: value to write
706 * @size: number of bytes to write from @val
708 * Simply writes @size bytes of @val to @port.
710 int ia64_pci_legacy_write(struct pci_dev *bus, u16 port, u32 val, u8 size)
733 * pci_cacheline_size - determine cacheline size for PCI devices
736 * We want to use the line-size of the outer-most cache. We assume
737 * that this line-size is the same for all CPUs.
739 * Code mostly taken from arch/ia64/kernel/palinfo.c:cache_info().
741 * RETURNS: An appropriate -ERRNO error value on eror, or zero for success.
744 pci_cacheline_size (void)
746 u64 levels, unique_caches;
748 pal_cache_config_info_t cci;
749 static u8 cacheline_size;
752 return cacheline_size;
754 status = ia64_pal_cache_summary(&levels, &unique_caches);
756 printk(KERN_ERR "%s: ia64_pal_cache_summary() failed (status=%ld)\n",
757 __FUNCTION__, status);
758 return SMP_CACHE_BYTES;
761 status = ia64_pal_cache_config_info(levels - 1, /* cache_type (data_or_unified)= */ 2,
764 printk(KERN_ERR "%s: ia64_pal_cache_config_info() failed (status=%ld)\n",
765 __FUNCTION__, status);
766 return SMP_CACHE_BYTES;
768 cacheline_size = 1 << cci.pcci_line_size;
769 return cacheline_size;
773 * pcibios_prep_mwi - helper function for drivers/pci/pci.c:pci_set_mwi()
774 * @dev: the PCI device for which MWI is enabled
776 * For ia64, we can get the cacheline sizes from PAL.
778 * RETURNS: An appropriate -ERRNO error value on eror, or zero for success.
781 pcibios_prep_mwi (struct pci_dev *dev)
783 unsigned long desired_linesize, current_linesize;
787 desired_linesize = pci_cacheline_size();
789 pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &pci_linesize);
790 current_linesize = 4 * pci_linesize;
791 if (desired_linesize != current_linesize) {
792 printk(KERN_WARNING "PCI: slot %s has incorrect PCI cache line size of %lu bytes,",
793 pci_name(dev), current_linesize);
794 if (current_linesize > desired_linesize) {
795 printk(" expected %lu bytes instead\n", desired_linesize);
798 printk(" correcting to %lu\n", desired_linesize);
799 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, desired_linesize / 4);
805 int pci_vector_resources(int last, int nr_released)
807 int count = nr_released;
809 count += (IA64_LAST_DEVICE_VECTOR - last);