2 * Low-Level PCI Support for PC
4 * (c) 1999--2000 Martin Mares <mj@ucw.cz>
7 #include <linux/sched.h>
9 #include <linux/ioport.h>
10 #include <linux/init.h>
11 #include <linux/dmi.h>
14 #include <asm/segment.h>
20 unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
23 static int pci_bf_sort;
25 int pcibios_last_bus = -1;
26 unsigned long pirq_table_addr;
27 struct pci_bus *pci_root_bus;
28 struct pci_raw_ops *raw_pci_ops;
29 struct pci_raw_ops *raw_pci_ext_ops;
31 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
32 int reg, int len, u32 *val)
34 if (reg < 256 && raw_pci_ops)
35 return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
37 return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
41 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
42 int reg, int len, u32 val)
44 if (reg < 256 && raw_pci_ops)
45 return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
47 return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
51 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
53 return raw_pci_read(pci_domain_nr(bus), bus->number,
54 devfn, where, size, value);
57 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
59 return raw_pci_write(pci_domain_nr(bus), bus->number,
60 devfn, where, size, value);
63 struct pci_ops pci_root_ops = {
69 * legacy, numa, and acpi all want to call pcibios_scan_root
70 * from their initcalls. This flag prevents that.
75 * This interrupt-safe spinlock protects all accesses to PCI
76 * configuration space.
78 DEFINE_SPINLOCK(pci_config_lock);
81 * Several buggy motherboards address only 16 devices and mirror
82 * them to next 16 IDs. We try to detect this `feature' on all
83 * primary buses (those containing host bridges as they are
84 * expected to be unique) and remove the ghost devices.
87 static void __devinit pcibios_fixup_ghosts(struct pci_bus *b)
89 struct list_head *ln, *mn;
90 struct pci_dev *d, *e;
91 int mirror = PCI_DEVFN(16,0);
92 int seen_host_bridge = 0;
95 DBG("PCI: Scanning for ghost devices on bus %d\n", b->number);
96 list_for_each(ln, &b->devices) {
98 if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST)
100 for (mn=ln->next; mn != &b->devices; mn=mn->next) {
102 if (e->devfn != d->devfn + mirror ||
103 e->vendor != d->vendor ||
104 e->device != d->device ||
105 e->class != d->class)
107 for(i=0; i<PCI_NUM_RESOURCES; i++)
108 if (e->resource[i].start != d->resource[i].start ||
109 e->resource[i].end != d->resource[i].end ||
110 e->resource[i].flags != d->resource[i].flags)
114 if (mn == &b->devices)
117 if (!seen_host_bridge)
119 printk(KERN_WARNING "PCI: Ignoring ghost devices on bus %02x\n", b->number);
122 while (ln->next != &b->devices) {
123 d = pci_dev_b(ln->next);
124 if (d->devfn >= mirror) {
125 list_del(&d->global_list);
126 list_del(&d->bus_list);
133 static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
135 struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
140 /* we deal with BIOS assigned ROM later */
142 if (!(pci_probe & PCI_ASSIGN_ROMS))
143 rom_r->start = rom_r->end = rom_r->flags = 0;
147 * Called after each bus is probed, but before its children
151 void __devinit pcibios_fixup_bus(struct pci_bus *b)
155 pcibios_fixup_ghosts(b);
156 pci_read_bridge_bases(b);
157 list_for_each_entry(dev, &b->devices, bus_list)
158 pcibios_fixup_device_resources(dev);
162 * Only use DMI information to set this if nothing was passed
163 * on the kernel command line (which was parsed earlier).
166 static int __devinit set_bf_sort(const struct dmi_system_id *d)
168 if (pci_bf_sort == pci_bf_sort_default) {
169 pci_bf_sort = pci_dmi_bf;
170 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
176 * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
179 static int __devinit assign_all_busses(const struct dmi_system_id *d)
181 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
182 printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
183 " (pci=assign-busses)\n", d->ident);
188 static struct dmi_system_id __devinitdata pciprobe_dmi_table[] = {
191 * Laptops which need pci=assign-busses to see Cardbus cards
194 .callback = assign_all_busses,
195 .ident = "Samsung X20 Laptop",
197 DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
198 DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
201 #endif /* __i386__ */
203 .callback = set_bf_sort,
204 .ident = "Dell PowerEdge 1950",
206 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
207 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
211 .callback = set_bf_sort,
212 .ident = "Dell PowerEdge 1955",
214 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
215 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
219 .callback = set_bf_sort,
220 .ident = "Dell PowerEdge 2900",
222 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
223 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
227 .callback = set_bf_sort,
228 .ident = "Dell PowerEdge 2950",
230 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
231 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
235 .callback = set_bf_sort,
236 .ident = "Dell PowerEdge R900",
238 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
239 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
243 .callback = set_bf_sort,
244 .ident = "HP ProLiant BL20p G3",
246 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
247 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
251 .callback = set_bf_sort,
252 .ident = "HP ProLiant BL20p G4",
254 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
255 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
259 .callback = set_bf_sort,
260 .ident = "HP ProLiant BL30p G1",
262 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
263 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
267 .callback = set_bf_sort,
268 .ident = "HP ProLiant BL25p G1",
270 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
271 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
275 .callback = set_bf_sort,
276 .ident = "HP ProLiant BL35p G1",
278 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
279 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
283 .callback = set_bf_sort,
284 .ident = "HP ProLiant BL45p G1",
286 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
287 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
291 .callback = set_bf_sort,
292 .ident = "HP ProLiant BL45p G2",
294 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
295 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
299 .callback = set_bf_sort,
300 .ident = "HP ProLiant BL460c G1",
302 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
303 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
307 .callback = set_bf_sort,
308 .ident = "HP ProLiant BL465c G1",
310 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
311 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
315 .callback = set_bf_sort,
316 .ident = "HP ProLiant BL480c G1",
318 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
319 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
323 .callback = set_bf_sort,
324 .ident = "HP ProLiant BL685c G1",
326 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
327 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
331 .callback = set_bf_sort,
332 .ident = "HP ProLiant DL385 G2",
334 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
335 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
339 .callback = set_bf_sort,
340 .ident = "HP ProLiant DL585 G2",
342 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
343 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
348 .callback = assign_all_busses,
349 .ident = "Compaq EVO N800c",
351 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
352 DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
357 .callback = set_bf_sort,
358 .ident = "HP ProLiant DL385 G2",
360 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
361 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
365 .callback = set_bf_sort,
366 .ident = "HP ProLiant DL585 G2",
368 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
369 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
375 struct pci_bus * __devinit pcibios_scan_root(int busnum)
377 struct pci_bus *bus = NULL;
378 struct pci_sysdata *sd;
380 dmi_check_system(pciprobe_dmi_table);
382 while ((bus = pci_find_next_bus(bus)) != NULL) {
383 if (bus->number == busnum) {
384 /* Already scanned */
389 /* Allocate per-root-bus (not per bus) arch-specific data.
390 * TODO: leak; this memory is never freed.
391 * It's arguable whether it's worth the trouble to care.
393 sd = kzalloc(sizeof(*sd), GFP_KERNEL);
395 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
399 printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
401 return pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
404 extern u8 pci_cache_line_size;
406 static int __init pcibios_init(void)
408 struct cpuinfo_x86 *c = &boot_cpu_data;
411 printk(KERN_WARNING "PCI: System does not support PCI\n");
416 * Assume PCI cacheline size of 32 bytes for all x86s except K7/K8
417 * and P4. It's also good for 386/486s (which actually have 16)
418 * as quite a few PCI devices do not support smaller values.
420 pci_cache_line_size = 32 >> 2;
421 if (c->x86 >= 6 && c->x86_vendor == X86_VENDOR_AMD)
422 pci_cache_line_size = 64 >> 2; /* K7 & K8 */
423 else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
424 pci_cache_line_size = 128 >> 2; /* P4 */
426 pcibios_resource_survey();
428 if (pci_bf_sort >= pci_force_bf)
429 pci_sort_breadthfirst();
430 #ifdef CONFIG_PCI_BIOS
431 if ((pci_probe & PCI_BIOS_SORT) && !(pci_probe & PCI_NO_SORT))
437 subsys_initcall(pcibios_init);
439 char * __devinit pcibios_setup(char *str)
441 if (!strcmp(str, "off")) {
444 } else if (!strcmp(str, "bfsort")) {
445 pci_bf_sort = pci_force_bf;
447 } else if (!strcmp(str, "nobfsort")) {
448 pci_bf_sort = pci_force_nobf;
451 #ifdef CONFIG_PCI_BIOS
452 else if (!strcmp(str, "bios")) {
453 pci_probe = PCI_PROBE_BIOS;
455 } else if (!strcmp(str, "nobios")) {
456 pci_probe &= ~PCI_PROBE_BIOS;
458 } else if (!strcmp(str, "nosort")) {
459 pci_probe |= PCI_NO_SORT;
461 } else if (!strcmp(str, "biosirq")) {
462 pci_probe |= PCI_BIOS_IRQ_SCAN;
464 } else if (!strncmp(str, "pirqaddr=", 9)) {
465 pirq_table_addr = simple_strtoul(str+9, NULL, 0);
469 #ifdef CONFIG_PCI_DIRECT
470 else if (!strcmp(str, "conf1")) {
471 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
474 else if (!strcmp(str, "conf2")) {
475 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
479 #ifdef CONFIG_PCI_MMCONFIG
480 else if (!strcmp(str, "nommconf")) {
481 pci_probe &= ~PCI_PROBE_MMCONF;
485 else if (!strcmp(str, "noacpi")) {
489 else if (!strcmp(str, "noearly")) {
490 pci_probe |= PCI_PROBE_NOEARLY;
493 #ifndef CONFIG_X86_VISWS
494 else if (!strcmp(str, "usepirqmask")) {
495 pci_probe |= PCI_USE_PIRQ_MASK;
497 } else if (!strncmp(str, "irqmask=", 8)) {
498 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
500 } else if (!strncmp(str, "lastbus=", 8)) {
501 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
505 else if (!strcmp(str, "rom")) {
506 pci_probe |= PCI_ASSIGN_ROMS;
508 } else if (!strcmp(str, "assign-busses")) {
509 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
511 } else if (!strcmp(str, "use_crs")) {
512 pci_probe |= PCI_USE__CRS;
514 } else if (!strcmp(str, "routeirq")) {
521 unsigned int pcibios_assign_all_busses(void)
523 return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
526 int pcibios_enable_device(struct pci_dev *dev, int mask)
530 if ((err = pcibios_enable_resources(dev, mask)) < 0)
533 if (!dev->msi_enabled)
534 return pcibios_enable_irq(dev);
538 void pcibios_disable_device (struct pci_dev *dev)
540 if (!dev->msi_enabled && pcibios_disable_irq)
541 pcibios_disable_irq(dev);
544 struct pci_bus *pci_scan_bus_with_sysdata(int busno)
546 struct pci_bus *bus = NULL;
547 struct pci_sysdata *sd;
550 * Allocate per-root-bus (not per bus) arch-specific data.
551 * TODO: leak; this memory is never freed.
552 * It's arguable whether it's worth the trouble to care.
554 sd = kzalloc(sizeof(*sd), GFP_KERNEL);
556 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
560 bus = pci_scan_bus(busno, &pci_root_ops, sd);