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 const struct dmi_system_id can_skip_pciprobe_dmi_table[] __devinitconst = {
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)
156 x86_pci_root_bus_res_quirks(b);
157 pci_read_bridge_bases(b);
158 list_for_each_entry(dev, &b->devices, bus_list)
159 pcibios_fixup_device_resources(dev);
163 * Only use DMI information to set this if nothing was passed
164 * on the kernel command line (which was parsed earlier).
167 static int __devinit set_bf_sort(const struct dmi_system_id *d)
169 if (pci_bf_sort == pci_bf_sort_default) {
170 pci_bf_sort = pci_dmi_bf;
171 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
177 * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
180 static int __devinit assign_all_busses(const struct dmi_system_id *d)
182 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
183 printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
184 " (pci=assign-busses)\n", d->ident);
189 static const struct dmi_system_id __devinitconst pciprobe_dmi_table[] = {
192 * Laptops which need pci=assign-busses to see Cardbus cards
195 .callback = assign_all_busses,
196 .ident = "Samsung X20 Laptop",
198 DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
199 DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
202 #endif /* __i386__ */
204 .callback = set_bf_sort,
205 .ident = "Dell PowerEdge 1950",
207 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
208 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
212 .callback = set_bf_sort,
213 .ident = "Dell PowerEdge 1955",
215 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
216 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
220 .callback = set_bf_sort,
221 .ident = "Dell PowerEdge 2900",
223 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
224 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
228 .callback = set_bf_sort,
229 .ident = "Dell PowerEdge 2950",
231 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
232 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
236 .callback = set_bf_sort,
237 .ident = "Dell PowerEdge R900",
239 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
240 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
244 .callback = set_bf_sort,
245 .ident = "HP ProLiant BL20p G3",
247 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
248 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
252 .callback = set_bf_sort,
253 .ident = "HP ProLiant BL20p G4",
255 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
256 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
260 .callback = set_bf_sort,
261 .ident = "HP ProLiant BL30p G1",
263 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
264 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
268 .callback = set_bf_sort,
269 .ident = "HP ProLiant BL25p G1",
271 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
272 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
276 .callback = set_bf_sort,
277 .ident = "HP ProLiant BL35p G1",
279 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
280 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
284 .callback = set_bf_sort,
285 .ident = "HP ProLiant BL45p G1",
287 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
288 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
292 .callback = set_bf_sort,
293 .ident = "HP ProLiant BL45p G2",
295 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
296 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
300 .callback = set_bf_sort,
301 .ident = "HP ProLiant BL460c G1",
303 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
304 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
308 .callback = set_bf_sort,
309 .ident = "HP ProLiant BL465c G1",
311 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
312 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
316 .callback = set_bf_sort,
317 .ident = "HP ProLiant BL480c G1",
319 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
320 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
324 .callback = set_bf_sort,
325 .ident = "HP ProLiant BL685c G1",
327 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
328 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
332 .callback = set_bf_sort,
333 .ident = "HP ProLiant DL360",
335 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
336 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
340 .callback = set_bf_sort,
341 .ident = "HP ProLiant DL380",
343 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
344 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
349 .callback = assign_all_busses,
350 .ident = "Compaq EVO N800c",
352 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
353 DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
358 .callback = set_bf_sort,
359 .ident = "HP ProLiant DL385 G2",
361 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
362 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
366 .callback = set_bf_sort,
367 .ident = "HP ProLiant DL585 G2",
369 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
370 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
376 void __init dmi_check_pciprobe(void)
378 dmi_check_system(pciprobe_dmi_table);
381 struct pci_bus * __devinit pcibios_scan_root(int busnum)
383 struct pci_bus *bus = NULL;
384 struct pci_sysdata *sd;
386 while ((bus = pci_find_next_bus(bus)) != NULL) {
387 if (bus->number == busnum) {
388 /* Already scanned */
393 /* Allocate per-root-bus (not per bus) arch-specific data.
394 * TODO: leak; this memory is never freed.
395 * It's arguable whether it's worth the trouble to care.
397 sd = kzalloc(sizeof(*sd), GFP_KERNEL);
399 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
403 sd->node = get_mp_bus_to_node(busnum);
405 printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
406 bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
413 extern u8 pci_cache_line_size;
415 int __init pcibios_init(void)
417 struct cpuinfo_x86 *c = &boot_cpu_data;
420 printk(KERN_WARNING "PCI: System does not support PCI\n");
425 * Assume PCI cacheline size of 32 bytes for all x86s except K7/K8
426 * and P4. It's also good for 386/486s (which actually have 16)
427 * as quite a few PCI devices do not support smaller values.
429 pci_cache_line_size = 32 >> 2;
430 if (c->x86 >= 6 && c->x86_vendor == X86_VENDOR_AMD)
431 pci_cache_line_size = 64 >> 2; /* K7 & K8 */
432 else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
433 pci_cache_line_size = 128 >> 2; /* P4 */
435 pcibios_resource_survey();
437 if (pci_bf_sort >= pci_force_bf)
438 pci_sort_breadthfirst();
442 char * __devinit pcibios_setup(char *str)
444 if (!strcmp(str, "off")) {
447 } else if (!strcmp(str, "bfsort")) {
448 pci_bf_sort = pci_force_bf;
450 } else if (!strcmp(str, "nobfsort")) {
451 pci_bf_sort = pci_force_nobf;
454 #ifdef CONFIG_PCI_BIOS
455 else if (!strcmp(str, "bios")) {
456 pci_probe = PCI_PROBE_BIOS;
458 } else if (!strcmp(str, "nobios")) {
459 pci_probe &= ~PCI_PROBE_BIOS;
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;
484 else if (!strcmp(str, "check_enable_amd_mmconf")) {
485 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
489 else if (!strcmp(str, "noacpi")) {
493 else if (!strcmp(str, "noearly")) {
494 pci_probe |= PCI_PROBE_NOEARLY;
497 #ifndef CONFIG_X86_VISWS
498 else if (!strcmp(str, "usepirqmask")) {
499 pci_probe |= PCI_USE_PIRQ_MASK;
501 } else if (!strncmp(str, "irqmask=", 8)) {
502 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
504 } else if (!strncmp(str, "lastbus=", 8)) {
505 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
509 else if (!strcmp(str, "rom")) {
510 pci_probe |= PCI_ASSIGN_ROMS;
512 } else if (!strcmp(str, "norom")) {
513 pci_probe |= PCI_NOASSIGN_ROMS;
515 } else if (!strcmp(str, "assign-busses")) {
516 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
518 } else if (!strcmp(str, "use_crs")) {
519 pci_probe |= PCI_USE__CRS;
521 } else if (!strcmp(str, "earlydump")) {
522 pci_early_dump_regs = 1;
524 } else if (!strcmp(str, "routeirq")) {
527 } else if (!strcmp(str, "skip_isa_align")) {
528 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
530 } else if (!strcmp(str, "noioapicquirk")) {
533 } else if (!strcmp(str, "ioapicreroute")) {
534 if (noioapicreroute != -1)
537 } else if (!strcmp(str, "noioapicreroute")) {
538 if (noioapicreroute != -1)
545 unsigned int pcibios_assign_all_busses(void)
547 return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
550 int pcibios_enable_device(struct pci_dev *dev, int mask)
554 if ((err = pci_enable_resources(dev, mask)) < 0)
557 if (!pci_dev_msi_enabled(dev))
558 return pcibios_enable_irq(dev);
562 void pcibios_disable_device (struct pci_dev *dev)
564 if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
565 pcibios_disable_irq(dev);
568 int pci_ext_cfg_avail(struct pci_dev *dev)
576 struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
578 struct pci_bus *bus = NULL;
579 struct pci_sysdata *sd;
582 * Allocate per-root-bus (not per bus) arch-specific data.
583 * TODO: leak; this memory is never freed.
584 * It's arguable whether it's worth the trouble to care.
586 sd = kzalloc(sizeof(*sd), GFP_KERNEL);
588 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
592 bus = pci_scan_bus(busno, ops, sd);
599 struct pci_bus * __devinit pci_scan_bus_with_sysdata(int busno)
601 return pci_scan_bus_on_node(busno, &pci_root_ops, -1);