2 * Port for PPC64 David Engebretsen, IBM Corp.
3 * Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
5 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
6 * Rework, based on alpha PCI code.
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/pci.h>
18 #include <linux/string.h>
19 #include <linux/init.h>
20 #include <linux/bootmem.h>
22 #include <linux/list.h>
23 #include <linux/syscalls.h>
24 #include <linux/irq.h>
25 #include <linux/vmalloc.h>
27 #include <asm/processor.h>
30 #include <asm/pci-bridge.h>
31 #include <asm/byteorder.h>
32 #include <asm/machdep.h>
33 #include <asm/ppc-pci.h>
37 #define DBG(fmt...) printk(fmt)
42 unsigned long pci_probe_only = 1;
44 /* pci_io_base -- the base address from which io bars are offsets.
45 * This is the lowest I/O base address (so bar values are always positive),
46 * and it *must* be the start of ISA space if an ISA bus exists because
47 * ISA drivers use hard coded offsets. If no ISA bus exists nothing
48 * is mapped on the first 64K of IO space
50 unsigned long pci_io_base = ISA_IO_BASE;
51 EXPORT_SYMBOL(pci_io_base);
55 static void fixup_broken_pcnet32(struct pci_dev* dev)
57 if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {
58 dev->vendor = PCI_VENDOR_ID_AMD;
59 pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD);
62 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID, fixup_broken_pcnet32);
65 static u32 get_int_prop(struct device_node *np, const char *name, u32 def)
70 prop = of_get_property(np, name, &len);
76 static unsigned int pci_parse_of_flags(u32 addr0)
78 unsigned int flags = 0;
80 if (addr0 & 0x02000000) {
81 flags = IORESOURCE_MEM | PCI_BASE_ADDRESS_SPACE_MEMORY;
82 flags |= (addr0 >> 22) & PCI_BASE_ADDRESS_MEM_TYPE_64;
83 flags |= (addr0 >> 28) & PCI_BASE_ADDRESS_MEM_TYPE_1M;
84 if (addr0 & 0x40000000)
85 flags |= IORESOURCE_PREFETCH
86 | PCI_BASE_ADDRESS_MEM_PREFETCH;
87 } else if (addr0 & 0x01000000)
88 flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO;
93 static void pci_parse_of_addrs(struct device_node *node, struct pci_dev *dev)
102 addrs = of_get_property(node, "assigned-addresses", &proplen);
105 DBG(" parse addresses (%d bytes) @ %p\n", proplen, addrs);
106 for (; proplen >= 20; proplen -= 20, addrs += 5) {
107 flags = pci_parse_of_flags(addrs[0]);
110 base = of_read_number(&addrs[1], 2);
111 size = of_read_number(&addrs[3], 2);
115 DBG(" base: %llx, size: %llx, i: %x\n",
116 (unsigned long long)base, (unsigned long long)size, i);
118 if (PCI_BASE_ADDRESS_0 <= i && i <= PCI_BASE_ADDRESS_5) {
119 res = &dev->resource[(i - PCI_BASE_ADDRESS_0) >> 2];
120 } else if (i == dev->rom_base_reg) {
121 res = &dev->resource[PCI_ROM_RESOURCE];
122 flags |= IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
124 printk(KERN_ERR "PCI: bad cfg reg num 0x%x\n", i);
128 res->end = base + size - 1;
130 res->name = pci_name(dev);
134 struct pci_dev *of_create_pci_dev(struct device_node *node,
135 struct pci_bus *bus, int devfn)
140 dev = alloc_pci_dev();
143 type = of_get_property(node, "device_type", NULL);
147 DBG(" create device, devfn: %x, type: %s\n", devfn, type);
151 dev->dev.parent = bus->bridge;
152 dev->dev.bus = &pci_bus_type;
154 dev->multifunction = 0; /* maybe a lie? */
156 dev->vendor = get_int_prop(node, "vendor-id", 0xffff);
157 dev->device = get_int_prop(node, "device-id", 0xffff);
158 dev->subsystem_vendor = get_int_prop(node, "subsystem-vendor-id", 0);
159 dev->subsystem_device = get_int_prop(node, "subsystem-id", 0);
161 dev->cfg_size = pci_cfg_space_size(dev);
163 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(bus),
164 dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));
165 dev->class = get_int_prop(node, "class-code", 0);
166 dev->revision = get_int_prop(node, "revision-id", 0);
168 DBG(" class: 0x%x\n", dev->class);
169 DBG(" revision: 0x%x\n", dev->revision);
171 dev->current_state = 4; /* unknown power state */
172 dev->error_state = pci_channel_io_normal;
173 dev->dma_mask = 0xffffffff;
175 if (!strcmp(type, "pci") || !strcmp(type, "pciex")) {
176 /* a PCI-PCI bridge */
177 dev->hdr_type = PCI_HEADER_TYPE_BRIDGE;
178 dev->rom_base_reg = PCI_ROM_ADDRESS1;
179 } else if (!strcmp(type, "cardbus")) {
180 dev->hdr_type = PCI_HEADER_TYPE_CARDBUS;
182 dev->hdr_type = PCI_HEADER_TYPE_NORMAL;
183 dev->rom_base_reg = PCI_ROM_ADDRESS;
184 /* Maybe do a default OF mapping here */
188 pci_parse_of_addrs(node, dev);
190 DBG(" adding to system ...\n");
192 pci_device_add(dev, bus);
196 EXPORT_SYMBOL(of_create_pci_dev);
198 void __devinit of_scan_bus(struct device_node *node,
201 struct device_node *child;
206 DBG("of_scan_bus(%s) bus no %d... \n", node->full_name, bus->number);
208 /* Scan direct children */
209 for_each_child_of_node(node, child) {
210 DBG(" * %s\n", child->full_name);
211 reg = of_get_property(child, "reg", ®len);
212 if (reg == NULL || reglen < 20)
214 devfn = (reg[0] >> 8) & 0xff;
216 /* create a new pci_dev for this device */
217 dev = of_create_pci_dev(child, bus, devfn);
220 DBG(" dev header type: %x\n", dev->hdr_type);
223 /* Ally all fixups */
224 pcibios_fixup_of_probed_bus(bus);
226 /* Now scan child busses */
227 list_for_each_entry(dev, &bus->devices, bus_list) {
228 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
229 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
230 struct device_node *child = pci_device_to_OF_node(dev);
232 of_scan_pci_bridge(child, dev);
236 EXPORT_SYMBOL(of_scan_bus);
238 void __devinit of_scan_pci_bridge(struct device_node *node,
242 const u32 *busrange, *ranges;
244 struct resource *res;
248 DBG("of_scan_pci_bridge(%s)\n", node->full_name);
250 /* parse bus-range property */
251 busrange = of_get_property(node, "bus-range", &len);
252 if (busrange == NULL || len != 8) {
253 printk(KERN_DEBUG "Can't get bus-range for PCI-PCI bridge %s\n",
257 ranges = of_get_property(node, "ranges", &len);
258 if (ranges == NULL) {
259 printk(KERN_DEBUG "Can't get ranges for PCI-PCI bridge %s\n",
264 bus = pci_add_new_bus(dev->bus, dev, busrange[0]);
266 printk(KERN_ERR "Failed to create pci bus for %s\n",
271 bus->primary = dev->bus->number;
272 bus->subordinate = busrange[1];
276 /* parse ranges property */
277 /* PCI #address-cells == 3 and #size-cells == 2 always */
278 res = &dev->resource[PCI_BRIDGE_RESOURCES];
279 for (i = 0; i < PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES; ++i) {
281 bus->resource[i] = res;
285 for (; len >= 32; len -= 32, ranges += 8) {
286 flags = pci_parse_of_flags(ranges[0]);
287 size = of_read_number(&ranges[6], 2);
288 if (flags == 0 || size == 0)
290 if (flags & IORESOURCE_IO) {
291 res = bus->resource[0];
293 printk(KERN_ERR "PCI: ignoring extra I/O range"
294 " for bridge %s\n", node->full_name);
298 if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) {
299 printk(KERN_ERR "PCI: too many memory ranges"
300 " for bridge %s\n", node->full_name);
303 res = bus->resource[i];
306 res->start = of_read_number(&ranges[1], 2);
307 res->end = res->start + size - 1;
310 sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus),
312 DBG(" bus name: %s\n", bus->name);
314 mode = PCI_PROBE_NORMAL;
315 if (ppc_md.pci_probe_mode)
316 mode = ppc_md.pci_probe_mode(bus);
317 DBG(" probe mode: %d\n", mode);
319 if (mode == PCI_PROBE_DEVTREE)
320 of_scan_bus(node, bus);
321 else if (mode == PCI_PROBE_NORMAL)
322 pci_scan_child_bus(bus);
324 EXPORT_SYMBOL(of_scan_pci_bridge);
326 void __devinit scan_phb(struct pci_controller *hose)
329 struct device_node *node = hose->dn;
332 DBG("PCI: Scanning PHB %s\n", node ? node->full_name : "<NO NAME>");
334 /* Create an empty bus for the toplevel */
335 bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, node);
337 printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
338 hose->global_number);
341 bus->secondary = hose->first_busno;
344 /* Get some IO space for the new PHB */
345 pcibios_map_io_space(bus);
347 /* Wire up PHB bus resources */
348 DBG("PCI: PHB IO resource = %016lx-%016lx [%lx]\n",
349 hose->io_resource.start, hose->io_resource.end,
350 hose->io_resource.flags);
351 bus->resource[0] = &hose->io_resource;
352 for (i = 0; i < 3; ++i) {
353 DBG("PCI: PHB MEM resource %d = %016lx-%016lx [%lx]\n", i,
354 hose->mem_resources[i].start,
355 hose->mem_resources[i].end,
356 hose->mem_resources[i].flags);
357 bus->resource[i+1] = &hose->mem_resources[i];
359 DBG("PCI: PHB MEM offset = %016lx\n", hose->pci_mem_offset);
360 DBG("PCI: PHB IO offset = %08lx\n",
361 (unsigned long)hose->io_base_virt - _IO_BASE);
363 /* Get probe mode and perform scan */
364 mode = PCI_PROBE_NORMAL;
365 if (node && ppc_md.pci_probe_mode)
366 mode = ppc_md.pci_probe_mode(bus);
367 DBG(" probe mode: %d\n", mode);
368 if (mode == PCI_PROBE_DEVTREE) {
369 bus->subordinate = hose->last_busno;
370 of_scan_bus(node, bus);
373 if (mode == PCI_PROBE_NORMAL)
374 hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
377 static int __init pcibios_init(void)
379 struct pci_controller *hose, *tmp;
381 printk(KERN_INFO "PCI: Probing PCI hardware\n");
383 /* For now, override phys_mem_access_prot. If we need it,
384 * later, we may move that initialization to each ppc_md
386 ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot;
389 ppc_pci_flags |= PPC_PCI_PROBE_ONLY;
391 /* Scan all of the recorded PCI controllers. */
392 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
394 pci_bus_add_devices(hose->bus);
397 /* Call common code to handle resource allocation */
398 pcibios_resource_survey();
400 printk(KERN_DEBUG "PCI: Probing PCI hardware done\n");
405 subsys_initcall(pcibios_init);
407 #ifdef CONFIG_HOTPLUG
409 int pcibios_unmap_io_space(struct pci_bus *bus)
411 struct pci_controller *hose;
413 WARN_ON(bus == NULL);
415 /* If this is not a PHB, we only flush the hash table over
416 * the area mapped by this bridge. We don't play with the PTE
417 * mappings since we might have to deal with sub-page alignemnts
418 * so flushing the hash table is the only sane way to make sure
419 * that no hash entries are covering that removed bridge area
420 * while still allowing other busses overlapping those pages
423 struct resource *res = bus->resource[0];
425 DBG("IO unmapping for PCI-PCI bridge %s\n",
426 pci_name(bus->self));
428 __flush_hash_table_range(&init_mm, res->start + _IO_BASE,
429 res->end - res->start + 1);
433 /* Get the host bridge */
434 hose = pci_bus_to_host(bus);
436 /* Check if we have IOs allocated */
437 if (hose->io_base_alloc == 0)
440 DBG("IO unmapping for PHB %s\n", hose->dn->full_name);
441 DBG(" alloc=0x%p\n", hose->io_base_alloc);
443 /* This is a PHB, we fully unmap the IO area */
444 vunmap(hose->io_base_alloc);
448 EXPORT_SYMBOL_GPL(pcibios_unmap_io_space);
450 #endif /* CONFIG_HOTPLUG */
452 int __devinit pcibios_map_io_space(struct pci_bus *bus)
454 struct vm_struct *area;
455 unsigned long phys_page;
456 unsigned long size_page;
457 unsigned long io_virt_offset;
458 struct pci_controller *hose;
460 WARN_ON(bus == NULL);
462 /* If this not a PHB, nothing to do, page tables still exist and
463 * thus HPTEs will be faulted in when needed
466 DBG("IO mapping for PCI-PCI bridge %s\n",
467 pci_name(bus->self));
468 DBG(" virt=0x%016lx...0x%016lx\n",
469 bus->resource[0]->start + _IO_BASE,
470 bus->resource[0]->end + _IO_BASE);
474 /* Get the host bridge */
475 hose = pci_bus_to_host(bus);
476 phys_page = _ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE);
477 size_page = _ALIGN_UP(hose->pci_io_size, PAGE_SIZE);
479 /* Make sure IO area address is clear */
480 hose->io_base_alloc = NULL;
482 /* If there's no IO to map on that bus, get away too */
483 if (hose->pci_io_size == 0 || hose->io_base_phys == 0)
486 /* Let's allocate some IO space for that guy. We don't pass
487 * VM_IOREMAP because we don't care about alignment tricks that
488 * the core does in that case. Maybe we should due to stupid card
489 * with incomplete address decoding but I'd rather not deal with
490 * those outside of the reserved 64K legacy region.
492 area = __get_vm_area(size_page, 0, PHB_IO_BASE, PHB_IO_END);
495 hose->io_base_alloc = area->addr;
496 hose->io_base_virt = (void __iomem *)(area->addr +
497 hose->io_base_phys - phys_page);
499 DBG("IO mapping for PHB %s\n", hose->dn->full_name);
500 DBG(" phys=0x%016lx, virt=0x%p (alloc=0x%p)\n",
501 hose->io_base_phys, hose->io_base_virt, hose->io_base_alloc);
502 DBG(" size=0x%016lx (alloc=0x%016lx)\n",
503 hose->pci_io_size, size_page);
505 /* Establish the mapping */
506 if (__ioremap_at(phys_page, area->addr, size_page,
507 _PAGE_NO_CACHE | _PAGE_GUARDED) == NULL)
510 /* Fixup hose IO resource */
511 io_virt_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
512 hose->io_resource.start += io_virt_offset;
513 hose->io_resource.end += io_virt_offset;
515 DBG(" hose->io_resource=0x%016lx...0x%016lx\n",
516 hose->io_resource.start, hose->io_resource.end);
520 EXPORT_SYMBOL_GPL(pcibios_map_io_space);
522 void __devinit pcibios_do_bus_setup(struct pci_bus *bus)
526 if (ppc_md.pci_dma_bus_setup)
527 ppc_md.pci_dma_bus_setup(bus);
529 list_for_each_entry(dev, &bus->devices, bus_list)
530 pcibios_setup_new_device(dev);
533 unsigned long pci_address_to_pio(phys_addr_t address)
535 struct pci_controller *hose, *tmp;
537 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
538 if (address >= hose->io_base_phys &&
539 address < (hose->io_base_phys + hose->pci_io_size)) {
541 (unsigned long)hose->io_base_virt - _IO_BASE;
542 return base + (address - hose->io_base_phys);
545 return (unsigned int)-1;
547 EXPORT_SYMBOL_GPL(pci_address_to_pio);
550 #define IOBASE_BRIDGE_NUMBER 0
551 #define IOBASE_MEMORY 1
553 #define IOBASE_ISA_IO 3
554 #define IOBASE_ISA_MEM 4
556 long sys_pciconfig_iobase(long which, unsigned long in_bus,
557 unsigned long in_devfn)
559 struct pci_controller* hose;
560 struct list_head *ln;
561 struct pci_bus *bus = NULL;
562 struct device_node *hose_node;
564 /* Argh ! Please forgive me for that hack, but that's the
565 * simplest way to get existing XFree to not lockup on some
566 * G5 machines... So when something asks for bus 0 io base
567 * (bus 0 is HT root), we return the AGP one instead.
569 if (machine_is_compatible("MacRISC4"))
573 /* That syscall isn't quite compatible with PCI domains, but it's
574 * used on pre-domains setup. We return the first match
577 for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
579 if (in_bus >= bus->number && in_bus <= bus->subordinate)
583 if (bus == NULL || bus->sysdata == NULL)
586 hose_node = (struct device_node *)bus->sysdata;
587 hose = PCI_DN(hose_node)->phb;
590 case IOBASE_BRIDGE_NUMBER:
591 return (long)hose->first_busno;
593 return (long)hose->pci_mem_offset;
595 return (long)hose->io_base_phys;
597 return (long)isa_io_base;
606 int pcibus_to_node(struct pci_bus *bus)
608 struct pci_controller *phb = pci_bus_to_host(bus);
611 EXPORT_SYMBOL(pcibus_to_node);