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
)
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 const struct dmi_system_id __devinitconst 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 (!pci_dev_msi_enabled(dev
))
555 return pcibios_enable_irq(dev
);
559 void pcibios_disable_device (struct pci_dev
*dev
)
561 if (!pci_dev_msi_enabled(dev
) && pcibios_disable_irq
)
562 pcibios_disable_irq(dev
);
565 int pci_ext_cfg_avail(struct pci_dev
*dev
)
573 struct pci_bus
* __devinit
pci_scan_bus_on_node(int busno
, struct pci_ops
*ops
, int node
)
575 struct pci_bus
*bus
= NULL
;
576 struct pci_sysdata
*sd
;
579 * Allocate per-root-bus (not per bus) arch-specific data.
580 * TODO: leak; this memory is never freed.
581 * It's arguable whether it's worth the trouble to care.
583 sd
= kzalloc(sizeof(*sd
), GFP_KERNEL
);
585 printk(KERN_ERR
"PCI: OOM, skipping PCI bus %02x\n", busno
);
589 bus
= pci_scan_bus(busno
, ops
, sd
);
596 struct pci_bus
* __devinit
pci_scan_bus_with_sysdata(int busno
)
598 return pci_scan_bus_on_node(busno
, &pci_root_ops
, -1);