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>
12 #include <linux/slab.h>
15 #include <asm/segment.h>
18 #include <asm/pci_x86.h>
20 unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
23 unsigned int pci_early_dump_regs;
24 static int pci_bf_sort;
25 static int smbios_type_b1_flag;
28 #ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
29 int noioapicreroute = 0;
31 int noioapicreroute = 1;
33 int pcibios_last_bus = -1;
34 unsigned long pirq_table_addr;
35 struct pci_bus *pci_root_bus;
36 struct pci_raw_ops *raw_pci_ops;
37 struct pci_raw_ops *raw_pci_ext_ops;
39 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
40 int reg, int len, u32 *val)
42 if (domain == 0 && reg < 256 && raw_pci_ops)
43 return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
45 return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
49 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
50 int reg, int len, u32 val)
52 if (domain == 0 && reg < 256 && raw_pci_ops)
53 return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
55 return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
59 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
61 return raw_pci_read(pci_domain_nr(bus), bus->number,
62 devfn, where, size, value);
65 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
67 return raw_pci_write(pci_domain_nr(bus), bus->number,
68 devfn, where, size, value);
71 struct pci_ops pci_root_ops = {
77 * This interrupt-safe spinlock protects all accesses to PCI
78 * configuration space.
80 DEFINE_RAW_SPINLOCK(pci_config_lock);
82 static int __devinit can_skip_ioresource_align(const struct dmi_system_id *d)
84 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
85 printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
89 static const struct dmi_system_id can_skip_pciprobe_dmi_table[] __devinitconst = {
91 * Systems where PCI IO resource ISA alignment can be skipped
92 * when the ISA enable bit in the bridge control is not set
95 .callback = can_skip_ioresource_align,
96 .ident = "IBM System x3800",
98 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
99 DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
103 .callback = can_skip_ioresource_align,
104 .ident = "IBM System x3850",
106 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
107 DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
111 .callback = can_skip_ioresource_align,
112 .ident = "IBM System x3950",
114 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
115 DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
121 void __init dmi_check_skip_isa_align(void)
123 dmi_check_system(can_skip_pciprobe_dmi_table);
126 static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
128 struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
129 struct resource *bar_r;
132 if (pci_probe & PCI_NOASSIGN_BARS) {
134 * If the BIOS did not assign the BAR, zero out the
135 * resource so the kernel doesn't attmept to assign
136 * it later on in pci_assign_unassigned_resources
138 for (bar = 0; bar <= PCI_STD_RESOURCE_END; bar++) {
139 bar_r = &dev->resource[bar];
140 if (bar_r->start == 0 && bar_r->end != 0) {
147 if (pci_probe & PCI_NOASSIGN_ROMS) {
151 /* we deal with BIOS assigned ROM later */
154 rom_r->start = rom_r->end = rom_r->flags = 0;
159 * Called after each bus is probed, but before its children
163 void __devinit pcibios_fixup_bus(struct pci_bus *b)
169 x86_pci_root_bus_res_quirks(b);
170 pci_read_bridge_bases(b);
171 list_for_each_entry(dev, &b->devices, bus_list)
172 pcibios_fixup_device_resources(dev);
176 * Only use DMI information to set this if nothing was passed
177 * on the kernel command line (which was parsed earlier).
180 static int __devinit set_bf_sort(const struct dmi_system_id *d)
182 if (pci_bf_sort == pci_bf_sort_default) {
183 pci_bf_sort = pci_dmi_bf;
184 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
189 static void __devinit read_dmi_type_b1(const struct dmi_header *dm,
192 u8 *d = (u8 *)dm + 4;
194 if (dm->type != 0xB1)
196 switch (((*(u32 *)d) >> 9) & 0x03) {
198 printk(KERN_INFO "dmi type 0xB1 record - unknown flag\n");
200 case 0x01: /* set pci=bfsort */
201 smbios_type_b1_flag = 1;
203 case 0x02: /* do not set pci=bfsort */
204 smbios_type_b1_flag = 2;
211 static int __devinit find_sort_method(const struct dmi_system_id *d)
213 dmi_walk(read_dmi_type_b1, NULL);
215 if (smbios_type_b1_flag == 1) {
223 * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
226 static int __devinit assign_all_busses(const struct dmi_system_id *d)
228 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
229 printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
230 " (pci=assign-busses)\n", d->ident);
235 static const struct dmi_system_id __devinitconst pciprobe_dmi_table[] = {
238 * Laptops which need pci=assign-busses to see Cardbus cards
241 .callback = assign_all_busses,
242 .ident = "Samsung X20 Laptop",
244 DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
245 DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
248 #endif /* __i386__ */
250 .callback = set_bf_sort,
251 .ident = "Dell PowerEdge 1950",
253 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
254 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
258 .callback = set_bf_sort,
259 .ident = "Dell PowerEdge 1955",
261 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
262 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
266 .callback = set_bf_sort,
267 .ident = "Dell PowerEdge 2900",
269 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
270 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
274 .callback = set_bf_sort,
275 .ident = "Dell PowerEdge 2950",
277 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
278 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
282 .callback = set_bf_sort,
283 .ident = "Dell PowerEdge R900",
285 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
286 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
290 .callback = find_sort_method,
291 .ident = "Dell System",
293 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
297 .callback = set_bf_sort,
298 .ident = "HP ProLiant BL20p G3",
300 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
301 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
305 .callback = set_bf_sort,
306 .ident = "HP ProLiant BL20p G4",
308 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
309 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
313 .callback = set_bf_sort,
314 .ident = "HP ProLiant BL30p G1",
316 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
317 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
321 .callback = set_bf_sort,
322 .ident = "HP ProLiant BL25p G1",
324 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
325 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
329 .callback = set_bf_sort,
330 .ident = "HP ProLiant BL35p G1",
332 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
333 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
337 .callback = set_bf_sort,
338 .ident = "HP ProLiant BL45p G1",
340 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
341 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
345 .callback = set_bf_sort,
346 .ident = "HP ProLiant BL45p G2",
348 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
349 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
353 .callback = set_bf_sort,
354 .ident = "HP ProLiant BL460c G1",
356 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
357 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
361 .callback = set_bf_sort,
362 .ident = "HP ProLiant BL465c G1",
364 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
365 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
369 .callback = set_bf_sort,
370 .ident = "HP ProLiant BL480c G1",
372 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
373 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
377 .callback = set_bf_sort,
378 .ident = "HP ProLiant BL685c G1",
380 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
381 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
385 .callback = set_bf_sort,
386 .ident = "HP ProLiant DL360",
388 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
389 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
393 .callback = set_bf_sort,
394 .ident = "HP ProLiant DL380",
396 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
397 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
402 .callback = assign_all_busses,
403 .ident = "Compaq EVO N800c",
405 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
406 DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
411 .callback = set_bf_sort,
412 .ident = "HP ProLiant DL385 G2",
414 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
415 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
419 .callback = set_bf_sort,
420 .ident = "HP ProLiant DL585 G2",
422 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
423 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
429 void __init dmi_check_pciprobe(void)
431 dmi_check_system(pciprobe_dmi_table);
434 struct pci_bus * __devinit pcibios_scan_root(int busnum)
436 struct pci_bus *bus = NULL;
437 struct pci_sysdata *sd;
439 while ((bus = pci_find_next_bus(bus)) != NULL) {
440 if (bus->number == busnum) {
441 /* Already scanned */
446 /* Allocate per-root-bus (not per bus) arch-specific data.
447 * TODO: leak; this memory is never freed.
448 * It's arguable whether it's worth the trouble to care.
450 sd = kzalloc(sizeof(*sd), GFP_KERNEL);
452 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
456 sd->node = get_mp_bus_to_node(busnum);
458 printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
459 bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
465 void __init pcibios_set_cache_line_size(void)
467 struct cpuinfo_x86 *c = &boot_cpu_data;
470 * Set PCI cacheline size to that of the CPU if the CPU has reported it.
471 * (For older CPUs that don't support cpuid, we se it to 32 bytes
472 * It's also good for 386/486s (which actually have 16)
473 * as quite a few PCI devices do not support smaller values.
475 if (c->x86_clflush_size > 0) {
476 pci_dfl_cache_line_size = c->x86_clflush_size >> 2;
477 printk(KERN_DEBUG "PCI: pci_cache_line_size set to %d bytes\n",
478 pci_dfl_cache_line_size << 2);
480 pci_dfl_cache_line_size = 32 >> 2;
481 printk(KERN_DEBUG "PCI: Unknown cacheline size. Setting to 32 bytes\n");
485 int __init pcibios_init(void)
488 printk(KERN_WARNING "PCI: System does not support PCI\n");
492 pcibios_set_cache_line_size();
493 pcibios_resource_survey();
495 if (pci_bf_sort >= pci_force_bf)
496 pci_sort_breadthfirst();
500 char * __devinit pcibios_setup(char *str)
502 if (!strcmp(str, "off")) {
505 } else if (!strcmp(str, "bfsort")) {
506 pci_bf_sort = pci_force_bf;
508 } else if (!strcmp(str, "nobfsort")) {
509 pci_bf_sort = pci_force_nobf;
512 #ifdef CONFIG_PCI_BIOS
513 else if (!strcmp(str, "bios")) {
514 pci_probe = PCI_PROBE_BIOS;
516 } else if (!strcmp(str, "nobios")) {
517 pci_probe &= ~PCI_PROBE_BIOS;
519 } else if (!strcmp(str, "biosirq")) {
520 pci_probe |= PCI_BIOS_IRQ_SCAN;
522 } else if (!strncmp(str, "pirqaddr=", 9)) {
523 pirq_table_addr = simple_strtoul(str+9, NULL, 0);
527 #ifdef CONFIG_PCI_DIRECT
528 else if (!strcmp(str, "conf1")) {
529 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
532 else if (!strcmp(str, "conf2")) {
533 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
537 #ifdef CONFIG_PCI_MMCONFIG
538 else if (!strcmp(str, "nommconf")) {
539 pci_probe &= ~PCI_PROBE_MMCONF;
542 else if (!strcmp(str, "check_enable_amd_mmconf")) {
543 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
547 else if (!strcmp(str, "noacpi")) {
551 else if (!strcmp(str, "noearly")) {
552 pci_probe |= PCI_PROBE_NOEARLY;
555 #ifndef CONFIG_X86_VISWS
556 else if (!strcmp(str, "usepirqmask")) {
557 pci_probe |= PCI_USE_PIRQ_MASK;
559 } else if (!strncmp(str, "irqmask=", 8)) {
560 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
562 } else if (!strncmp(str, "lastbus=", 8)) {
563 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
567 else if (!strcmp(str, "rom")) {
568 pci_probe |= PCI_ASSIGN_ROMS;
570 } else if (!strcmp(str, "norom")) {
571 pci_probe |= PCI_NOASSIGN_ROMS;
573 } else if (!strcmp(str, "nobar")) {
574 pci_probe |= PCI_NOASSIGN_BARS;
576 } else if (!strcmp(str, "assign-busses")) {
577 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
579 } else if (!strcmp(str, "use_crs")) {
580 pci_probe |= PCI_USE__CRS;
582 } else if (!strcmp(str, "nocrs")) {
583 pci_probe |= PCI_ROOT_NO_CRS;
585 } else if (!strcmp(str, "earlydump")) {
586 pci_early_dump_regs = 1;
588 } else if (!strcmp(str, "routeirq")) {
591 } else if (!strcmp(str, "skip_isa_align")) {
592 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
594 } else if (!strcmp(str, "noioapicquirk")) {
597 } else if (!strcmp(str, "ioapicreroute")) {
598 if (noioapicreroute != -1)
601 } else if (!strcmp(str, "noioapicreroute")) {
602 if (noioapicreroute != -1)
609 unsigned int pcibios_assign_all_busses(void)
611 return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
614 int pcibios_enable_device(struct pci_dev *dev, int mask)
618 if ((err = pci_enable_resources(dev, mask)) < 0)
621 if (!pci_dev_msi_enabled(dev))
622 return pcibios_enable_irq(dev);
626 void pcibios_disable_device (struct pci_dev *dev)
628 if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
629 pcibios_disable_irq(dev);
632 int pci_ext_cfg_avail(struct pci_dev *dev)
640 struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
642 struct pci_bus *bus = NULL;
643 struct pci_sysdata *sd;
646 * Allocate per-root-bus (not per bus) arch-specific data.
647 * TODO: leak; this memory is never freed.
648 * It's arguable whether it's worth the trouble to care.
650 sd = kzalloc(sizeof(*sd), GFP_KERNEL);
652 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
656 bus = pci_scan_bus(busno, ops, sd);
663 struct pci_bus * __devinit pci_scan_bus_with_sysdata(int busno)
665 return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
669 * NUMA info for PCI busses
671 * Early arch code is responsible for filling in reasonable values here.
672 * A node id of "-1" means "use current node". In other words, if a bus
673 * has a -1 node id, it's not tightly coupled to any particular chunk
674 * of memory (as is the case on some Nehalem systems).
682 static int mp_bus_to_node[BUS_NR] = {
683 [0 ... BUS_NR - 1] = -1
686 void set_mp_bus_to_node(int busnum, int node)
688 if (busnum >= 0 && busnum < BUS_NR)
689 mp_bus_to_node[busnum] = node;
692 int get_mp_bus_to_node(int busnum)
696 if (busnum < 0 || busnum > (BUS_NR - 1))
699 node = mp_bus_to_node[busnum];
702 * let numa_node_id to decide it later in dma_alloc_pages
703 * if there is no ram on that node
705 if (node != -1 && !node_online(node))
711 #else /* CONFIG_X86_32 */
713 static int mp_bus_to_node[BUS_NR] = {
714 [0 ... BUS_NR - 1] = -1
717 void set_mp_bus_to_node(int busnum, int node)
719 if (busnum >= 0 && busnum < BUS_NR)
720 mp_bus_to_node[busnum] = (unsigned char) node;
723 int get_mp_bus_to_node(int busnum)
727 if (busnum < 0 || busnum > (BUS_NR - 1))
729 node = mp_bus_to_node[busnum];
733 #endif /* CONFIG_X86_32 */
735 #endif /* CONFIG_NUMA */