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>
17 #include <asm/pci_x86.h>
19 unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
22 unsigned int pci_early_dump_regs;
23 static int pci_bf_sort;
26 #ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
27 int noioapicreroute = 0;
29 int noioapicreroute = 1;
31 int pcibios_last_bus = -1;
32 unsigned long pirq_table_addr;
33 struct pci_bus *pci_root_bus;
34 struct pci_raw_ops *raw_pci_ops;
35 struct pci_raw_ops *raw_pci_ext_ops;
37 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
38 int reg, int len, u32 *val)
40 if (domain == 0 && reg < 256 && raw_pci_ops)
41 return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
43 return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
47 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
48 int reg, int len, u32 val)
50 if (domain == 0 && reg < 256 && raw_pci_ops)
51 return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
53 return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
57 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
59 return raw_pci_read(pci_domain_nr(bus), bus->number,
60 devfn, where, size, value);
63 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
65 return raw_pci_write(pci_domain_nr(bus), bus->number,
66 devfn, where, size, value);
69 struct pci_ops pci_root_ops = {
75 * legacy, numa, and acpi all want to call pcibios_scan_root
76 * from their initcalls. This flag prevents that.
81 * This interrupt-safe spinlock protects all accesses to PCI
82 * configuration space.
84 DEFINE_SPINLOCK(pci_config_lock);
86 static int __devinit can_skip_ioresource_align(const struct dmi_system_id *d)
88 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
89 printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
93 static struct dmi_system_id can_skip_pciprobe_dmi_table[] __devinitdata = {
95 * Systems where PCI IO resource ISA alignment can be skipped
96 * when the ISA enable bit in the bridge control is not set
99 .callback = can_skip_ioresource_align,
100 .ident = "IBM System x3800",
102 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
103 DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
107 .callback = can_skip_ioresource_align,
108 .ident = "IBM System x3850",
110 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
111 DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
115 .callback = can_skip_ioresource_align,
116 .ident = "IBM System x3950",
118 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
119 DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
125 void __init dmi_check_skip_isa_align(void)
127 dmi_check_system(can_skip_pciprobe_dmi_table);
130 static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
132 struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
134 if (pci_probe & PCI_NOASSIGN_ROMS) {
138 /* we deal with BIOS assigned ROM later */
141 rom_r->start = rom_r->end = rom_r->flags = 0;
146 * Called after each bus is probed, but before its children
150 void __devinit pcibios_fixup_bus(struct pci_bus *b)
154 pci_read_bridge_bases(b);
155 list_for_each_entry(dev, &b->devices, bus_list)
156 pcibios_fixup_device_resources(dev);
160 * Only use DMI information to set this if nothing was passed
161 * on the kernel command line (which was parsed earlier).
164 static int __devinit set_bf_sort(const struct dmi_system_id *d)
166 if (pci_bf_sort == pci_bf_sort_default) {
167 pci_bf_sort = pci_dmi_bf;
168 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
174 * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
177 static int __devinit assign_all_busses(const struct dmi_system_id *d)
179 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
180 printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
181 " (pci=assign-busses)\n", d->ident);
186 static struct dmi_system_id __devinitdata pciprobe_dmi_table[] = {
189 * Laptops which need pci=assign-busses to see Cardbus cards
192 .callback = assign_all_busses,
193 .ident = "Samsung X20 Laptop",
195 DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
196 DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
199 #endif /* __i386__ */
201 .callback = set_bf_sort,
202 .ident = "Dell PowerEdge 1950",
204 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
205 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
209 .callback = set_bf_sort,
210 .ident = "Dell PowerEdge 1955",
212 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
213 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
217 .callback = set_bf_sort,
218 .ident = "Dell PowerEdge 2900",
220 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
221 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
225 .callback = set_bf_sort,
226 .ident = "Dell PowerEdge 2950",
228 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
229 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
233 .callback = set_bf_sort,
234 .ident = "Dell PowerEdge R900",
236 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
237 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
241 .callback = set_bf_sort,
242 .ident = "HP ProLiant BL20p G3",
244 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
245 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
249 .callback = set_bf_sort,
250 .ident = "HP ProLiant BL20p G4",
252 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
253 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
257 .callback = set_bf_sort,
258 .ident = "HP ProLiant BL30p G1",
260 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
261 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
265 .callback = set_bf_sort,
266 .ident = "HP ProLiant BL25p G1",
268 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
269 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
273 .callback = set_bf_sort,
274 .ident = "HP ProLiant BL35p G1",
276 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
277 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
281 .callback = set_bf_sort,
282 .ident = "HP ProLiant BL45p G1",
284 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
285 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
289 .callback = set_bf_sort,
290 .ident = "HP ProLiant BL45p G2",
292 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
293 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
297 .callback = set_bf_sort,
298 .ident = "HP ProLiant BL460c G1",
300 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
301 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
305 .callback = set_bf_sort,
306 .ident = "HP ProLiant BL465c G1",
308 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
309 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
313 .callback = set_bf_sort,
314 .ident = "HP ProLiant BL480c G1",
316 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
317 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
321 .callback = set_bf_sort,
322 .ident = "HP ProLiant BL685c G1",
324 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
325 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
329 .callback = set_bf_sort,
330 .ident = "HP ProLiant DL360",
332 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
333 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
337 .callback = set_bf_sort,
338 .ident = "HP ProLiant DL380",
340 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
341 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
346 .callback = assign_all_busses,
347 .ident = "Compaq EVO N800c",
349 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
350 DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
355 .callback = set_bf_sort,
356 .ident = "HP ProLiant DL385 G2",
358 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
359 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
363 .callback = set_bf_sort,
364 .ident = "HP ProLiant DL585 G2",
366 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
367 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
373 void __init dmi_check_pciprobe(void)
375 dmi_check_system(pciprobe_dmi_table);
378 struct pci_bus * __devinit pcibios_scan_root(int busnum)
380 struct pci_bus *bus = NULL;
381 struct pci_sysdata *sd;
383 while ((bus = pci_find_next_bus(bus)) != NULL) {
384 if (bus->number == busnum) {
385 /* Already scanned */
390 /* Allocate per-root-bus (not per bus) arch-specific data.
391 * TODO: leak; this memory is never freed.
392 * It's arguable whether it's worth the trouble to care.
394 sd = kzalloc(sizeof(*sd), GFP_KERNEL);
396 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
400 sd->node = get_mp_bus_to_node(busnum);
402 printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
403 bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
410 extern u8 pci_cache_line_size;
412 int __init pcibios_init(void)
414 struct cpuinfo_x86 *c = &boot_cpu_data;
417 printk(KERN_WARNING "PCI: System does not support PCI\n");
422 * Assume PCI cacheline size of 32 bytes for all x86s except K7/K8
423 * and P4. It's also good for 386/486s (which actually have 16)
424 * as quite a few PCI devices do not support smaller values.
426 pci_cache_line_size = 32 >> 2;
427 if (c->x86 >= 6 && c->x86_vendor == X86_VENDOR_AMD)
428 pci_cache_line_size = 64 >> 2; /* K7 & K8 */
429 else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
430 pci_cache_line_size = 128 >> 2; /* P4 */
432 pcibios_resource_survey();
434 if (pci_bf_sort >= pci_force_bf)
435 pci_sort_breadthfirst();
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, "biosirq")) {
459 pci_probe |= PCI_BIOS_IRQ_SCAN;
461 } else if (!strncmp(str, "pirqaddr=", 9)) {
462 pirq_table_addr = simple_strtoul(str+9, NULL, 0);
466 #ifdef CONFIG_PCI_DIRECT
467 else if (!strcmp(str, "conf1")) {
468 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
471 else if (!strcmp(str, "conf2")) {
472 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
476 #ifdef CONFIG_PCI_MMCONFIG
477 else if (!strcmp(str, "nommconf")) {
478 pci_probe &= ~PCI_PROBE_MMCONF;
481 else if (!strcmp(str, "check_enable_amd_mmconf")) {
482 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
486 else if (!strcmp(str, "noacpi")) {
490 else if (!strcmp(str, "noearly")) {
491 pci_probe |= PCI_PROBE_NOEARLY;
494 #ifndef CONFIG_X86_VISWS
495 else if (!strcmp(str, "usepirqmask")) {
496 pci_probe |= PCI_USE_PIRQ_MASK;
498 } else if (!strncmp(str, "irqmask=", 8)) {
499 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
501 } else if (!strncmp(str, "lastbus=", 8)) {
502 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
506 else if (!strcmp(str, "rom")) {
507 pci_probe |= PCI_ASSIGN_ROMS;
509 } else if (!strcmp(str, "norom")) {
510 pci_probe |= PCI_NOASSIGN_ROMS;
512 } else if (!strcmp(str, "assign-busses")) {
513 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
515 } else if (!strcmp(str, "use_crs")) {
516 pci_probe |= PCI_USE__CRS;
518 } else if (!strcmp(str, "earlydump")) {
519 pci_early_dump_regs = 1;
521 } else if (!strcmp(str, "routeirq")) {
524 } else if (!strcmp(str, "skip_isa_align")) {
525 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
527 } else if (!strcmp(str, "noioapicquirk")) {
530 } else if (!strcmp(str, "ioapicreroute")) {
531 if (noioapicreroute != -1)
534 } else if (!strcmp(str, "noioapicreroute")) {
535 if (noioapicreroute != -1)
542 unsigned int pcibios_assign_all_busses(void)
544 return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
547 int pcibios_enable_device(struct pci_dev *dev, int mask)
551 if ((err = pci_enable_resources(dev, mask)) < 0)
554 if (!dev->msi_enabled)
555 return pcibios_enable_irq(dev);
559 void pcibios_disable_device (struct pci_dev *dev)
561 if (!dev->msi_enabled && pcibios_disable_irq)
562 pcibios_disable_irq(dev);
565 struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
567 struct pci_bus *bus = NULL;
568 struct pci_sysdata *sd;
571 * Allocate per-root-bus (not per bus) arch-specific data.
572 * TODO: leak; this memory is never freed.
573 * It's arguable whether it's worth the trouble to care.
575 sd = kzalloc(sizeof(*sd), GFP_KERNEL);
577 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
581 bus = pci_scan_bus(busno, ops, sd);
588 struct pci_bus * __devinit pci_scan_bus_with_sysdata(int busno)
590 return pci_scan_bus_on_node(busno, &pci_root_ops, -1);