1 // SPDX-License-Identifier: GPL-2.0-only
3 * pci.c - Low-Level PCI Access in IA-64
5 * Derived from bios32.c of i386 tree.
7 * (c) Copyright 2002, 2005 Hewlett-Packard Development Company, L.P.
8 * David Mosberger-Tang <davidm@hpl.hp.com>
9 * Bjorn Helgaas <bjorn.helgaas@hp.com>
10 * Copyright (C) 2004 Silicon Graphics, Inc.
12 * Note: Above list of copyright holders is incomplete...
15 #include <linux/acpi.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
18 #include <linux/pci.h>
19 #include <linux/pci-acpi.h>
20 #include <linux/init.h>
21 #include <linux/ioport.h>
22 #include <linux/slab.h>
23 #include <linux/spinlock.h>
24 #include <linux/memblock.h>
25 #include <linux/export.h>
27 #include <asm/machvec.h>
33 #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))
49 int raw_pci_read(unsigned int seg, unsigned int bus, unsigned int devfn,
50 int reg, int len, u32 *value)
55 if (!value || (seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
58 if ((seg | reg) <= 255) {
59 addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
61 } else if (sal_revision >= SAL_VERSION_CODE(3,2)) {
62 addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
68 result = ia64_sal_pci_config_read(addr, mode, len, &data);
76 int raw_pci_write(unsigned int seg, unsigned int bus, unsigned int devfn,
77 int reg, int len, u32 value)
82 if ((seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
85 if ((seg | reg) <= 255) {
86 addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
88 } else if (sal_revision >= SAL_VERSION_CODE(3,2)) {
89 addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
94 result = ia64_sal_pci_config_write(addr, mode, len, value);
100 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
101 int size, u32 *value)
103 return raw_pci_read(pci_domain_nr(bus), bus->number,
104 devfn, where, size, value);
107 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
110 return raw_pci_write(pci_domain_nr(bus), bus->number,
111 devfn, where, size, value);
114 struct pci_ops pci_root_ops = {
119 struct pci_root_info {
120 struct acpi_pci_root_info common;
121 struct pci_controller controller;
122 struct list_head io_resources;
125 static unsigned int new_space(u64 phys_base, int sparse)
131 return 0; /* legacy I/O port space */
133 mmio_base = (u64) ioremap(phys_base, 0);
134 for (i = 0; i < num_io_spaces; i++)
135 if (io_space[i].mmio_base == mmio_base &&
136 io_space[i].sparse == sparse)
139 if (num_io_spaces == MAX_IO_SPACES) {
140 pr_err("PCI: Too many IO port spaces "
141 "(MAX_IO_SPACES=%lu)\n", MAX_IO_SPACES);
146 io_space[i].mmio_base = mmio_base;
147 io_space[i].sparse = sparse;
152 static int add_io_space(struct device *dev, struct pci_root_info *info,
153 struct resource_entry *entry)
155 struct resource_entry *iospace;
156 struct resource *resource, *res = entry->res;
158 unsigned long base, min, max, base_port;
159 unsigned int sparse = 0, space_nr, len;
161 len = strlen(info->common.name) + 32;
162 iospace = resource_list_create_entry(NULL, len);
164 dev_err(dev, "PCI: No memory for %s I/O port space\n",
169 if (res->flags & IORESOURCE_IO_SPARSE)
171 space_nr = new_space(entry->offset, sparse);
175 name = (char *)(iospace + 1);
176 min = res->start - entry->offset;
177 max = res->end - entry->offset;
178 base = __pa(io_space[space_nr].mmio_base);
179 base_port = IO_SPACE_BASE(space_nr);
180 snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->common.name,
181 base_port + min, base_port + max);
184 * The SDM guarantees the legacy 0-64K space is sparse, but if the
185 * mapping is done by the processor (not the bridge), ACPI may not
191 resource = iospace->res;
192 resource->name = name;
193 resource->flags = IORESOURCE_MEM;
194 resource->start = base + (sparse ? IO_SPACE_SPARSE_ENCODING(min) : min);
195 resource->end = base + (sparse ? IO_SPACE_SPARSE_ENCODING(max) : max);
196 if (insert_resource(&iomem_resource, resource)) {
198 "can't allocate host bridge io space resource %pR\n",
203 entry->offset = base_port;
204 res->start = min + base_port;
205 res->end = max + base_port;
206 resource_list_add_tail(iospace, &info->io_resources);
211 resource_list_free_entry(iospace);
216 * An IO port or MMIO resource assigned to a PCI host bridge may be
217 * consumed by the host bridge itself or available to its child
218 * bus/devices. The ACPI specification defines a bit (Producer/Consumer)
219 * to tell whether the resource is consumed by the host bridge itself,
220 * but firmware hasn't used that bit consistently, so we can't rely on it.
222 * On x86 and IA64 platforms, all IO port and MMIO resources are assumed
223 * to be available to child bus/devices except one special case:
224 * IO port [0xCF8-0xCFF] is consumed by the host bridge itself
225 * to access PCI configuration space.
227 * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
229 static bool resource_is_pcicfg_ioport(struct resource *res)
231 return (res->flags & IORESOURCE_IO) &&
232 res->start == 0xCF8 && res->end == 0xCFF;
235 static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
237 struct device *dev = &ci->bridge->dev;
238 struct pci_root_info *info;
239 struct resource *res;
240 struct resource_entry *entry, *tmp;
243 status = acpi_pci_probe_root_resources(ci);
245 info = container_of(ci, struct pci_root_info, common);
246 resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
248 if (res->flags & IORESOURCE_MEM) {
250 * HP's firmware has a hack to work around a
251 * Windows bug. Ignore these tiny memory ranges.
253 if (resource_size(res) <= 16) {
254 resource_list_del(entry);
255 insert_resource(&iomem_resource,
257 resource_list_add_tail(entry,
258 &info->io_resources);
260 } else if (res->flags & IORESOURCE_IO) {
261 if (resource_is_pcicfg_ioport(entry->res))
262 resource_list_destroy_entry(entry);
263 else if (add_io_space(dev, info, entry))
264 resource_list_destroy_entry(entry);
272 static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
274 struct pci_root_info *info;
275 struct resource_entry *entry, *tmp;
277 info = container_of(ci, struct pci_root_info, common);
278 resource_list_for_each_entry_safe(entry, tmp, &info->io_resources) {
279 release_resource(entry->res);
280 resource_list_destroy_entry(entry);
285 static struct acpi_pci_root_ops pci_acpi_root_ops = {
286 .pci_ops = &pci_root_ops,
287 .release_info = pci_acpi_root_release_info,
288 .prepare_resources = pci_acpi_root_prepare_resources,
291 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
293 struct acpi_device *device = root->device;
294 struct pci_root_info *info;
296 info = kzalloc(sizeof(*info), GFP_KERNEL);
298 dev_err(&device->dev,
299 "pci_bus %04x:%02x: ignored (out of memory)\n",
300 root->segment, (int)root->secondary.start);
304 info->controller.segment = root->segment;
305 info->controller.companion = device;
306 info->controller.node = acpi_get_node(device->handle);
307 INIT_LIST_HEAD(&info->io_resources);
308 return acpi_pci_root_create(root, &pci_acpi_root_ops,
309 &info->common, &info->controller);
312 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
315 * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
316 * here, pci_create_root_bus() has been called by someone else and
317 * sysdata is likely to be different from what we expect. Let it go in
320 if (!bridge->dev.parent) {
321 struct pci_controller *controller = bridge->bus->sysdata;
322 ACPI_COMPANION_SET(&bridge->dev, controller->companion);
327 void pcibios_fixup_device_resources(struct pci_dev *dev)
334 for (idx = 0; idx < PCI_BRIDGE_RESOURCES; idx++) {
335 struct resource *r = &dev->resource[idx];
337 if (!r->flags || r->parent || !r->start)
340 pci_claim_resource(dev, idx);
343 EXPORT_SYMBOL_GPL(pcibios_fixup_device_resources);
345 static void pcibios_fixup_bridge_resources(struct pci_dev *dev)
352 for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
353 struct resource *r = &dev->resource[idx];
355 if (!r->flags || r->parent || !r->start)
358 pci_claim_bridge_resource(dev, idx);
363 * Called after each bus is probed, but before its children are examined.
365 void pcibios_fixup_bus(struct pci_bus *b)
370 pci_read_bridge_bases(b);
371 pcibios_fixup_bridge_resources(b->self);
373 list_for_each_entry(dev, &b->devices, bus_list)
374 pcibios_fixup_device_resources(dev);
375 platform_pci_fixup_bus(b);
378 void pcibios_add_bus(struct pci_bus *bus)
380 acpi_pci_add_bus(bus);
383 void pcibios_remove_bus(struct pci_bus *bus)
385 acpi_pci_remove_bus(bus);
388 void pcibios_set_master (struct pci_dev *dev)
390 /* No special bus mastering setup handling */
394 pcibios_enable_device (struct pci_dev *dev, int mask)
398 ret = pci_enable_resources(dev, mask);
402 if (!pci_dev_msi_enabled(dev))
403 return acpi_pci_irq_enable(dev);
408 pcibios_disable_device (struct pci_dev *dev)
410 BUG_ON(atomic_read(&dev->enable_cnt));
411 if (!pci_dev_msi_enabled(dev))
412 acpi_pci_irq_disable(dev);
416 * ia64_pci_get_legacy_mem - generic legacy mem routine
417 * @bus: bus to get legacy memory base address for
419 * Find the base of legacy memory for @bus. This is typically the first
420 * megabyte of bus address space for @bus or is simply 0 on platforms whose
421 * chipsets support legacy I/O and memory routing. Returns the base address
422 * or an error pointer if an error occurred.
424 * This is the ia64 generic version of this routine. Other platforms
425 * are free to override it with a machine vector.
427 char *ia64_pci_get_legacy_mem(struct pci_bus *bus)
429 return (char *)__IA64_UNCACHED_OFFSET;
433 * pci_mmap_legacy_page_range - map legacy memory space to userland
434 * @bus: bus whose legacy space we're mapping
435 * @vma: vma passed in by mmap
437 * Map legacy memory space for this device back to userspace using a machine
438 * vector to get the base address.
441 pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
442 enum pci_mmap_state mmap_state)
444 unsigned long size = vma->vm_end - vma->vm_start;
448 /* We only support mmap'ing of legacy memory space */
449 if (mmap_state != pci_mmap_mem)
453 * Avoid attribute aliasing. See Documentation/ia64/aliasing.txt
456 if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
458 prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
461 addr = pci_get_legacy_mem(bus);
463 return PTR_ERR(addr);
465 vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT;
466 vma->vm_page_prot = prot;
468 if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
469 size, vma->vm_page_prot))
476 * ia64_pci_legacy_read - read from legacy I/O space
478 * @port: legacy port value
479 * @val: caller allocated storage for returned value
480 * @size: number of bytes to read
482 * Simply reads @size bytes from @port and puts the result in @val.
484 * Again, this (and the write routine) are generic versions that can be
485 * overridden by the platform. This is necessary on platforms that don't
486 * support legacy I/O routing or that hard fail on legacy I/O timeouts.
488 int ia64_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size)
511 * ia64_pci_legacy_write - perform a legacy I/O write
513 * @port: port to write
514 * @val: value to write
515 * @size: number of bytes to write from @val
517 * Simply writes @size bytes of @val to @port.
519 int ia64_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size)
542 * set_pci_cacheline_size - determine cacheline size for PCI devices
544 * We want to use the line-size of the outer-most cache. We assume
545 * that this line-size is the same for all CPUs.
547 * Code mostly taken from arch/ia64/kernel/palinfo.c:cache_info().
549 static void __init set_pci_dfl_cacheline_size(void)
551 unsigned long levels, unique_caches;
553 pal_cache_config_info_t cci;
555 status = ia64_pal_cache_summary(&levels, &unique_caches);
557 pr_err("%s: ia64_pal_cache_summary() failed "
558 "(status=%ld)\n", __func__, status);
562 status = ia64_pal_cache_config_info(levels - 1,
563 /* cache_type (data_or_unified)= */ 2, &cci);
565 pr_err("%s: ia64_pal_cache_config_info() failed "
566 "(status=%ld)\n", __func__, status);
569 pci_dfl_cache_line_size = (1 << cci.pcci_line_size) / 4;
572 static int __init pcibios_init(void)
574 set_pci_dfl_cacheline_size();
578 subsys_initcall(pcibios_init);