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
);
80 static void __devinit
pcibios_fixup_device_resources(struct pci_dev
*dev
)
82 struct resource
*rom_r
= &dev
->resource
[PCI_ROM_RESOURCE
];
87 /* we deal with BIOS assigned ROM later */
89 if (!(pci_probe
& PCI_ASSIGN_ROMS
))
90 rom_r
->start
= rom_r
->end
= rom_r
->flags
= 0;
94 * Called after each bus is probed, but before its children
98 void __devinit
pcibios_fixup_bus(struct pci_bus
*b
)
102 pci_read_bridge_bases(b
);
103 list_for_each_entry(dev
, &b
->devices
, bus_list
)
104 pcibios_fixup_device_resources(dev
);
108 * Only use DMI information to set this if nothing was passed
109 * on the kernel command line (which was parsed earlier).
112 static int __devinit
set_bf_sort(const struct dmi_system_id
*d
)
114 if (pci_bf_sort
== pci_bf_sort_default
) {
115 pci_bf_sort
= pci_dmi_bf
;
116 printk(KERN_INFO
"PCI: %s detected, enabling pci=bfsort.\n", d
->ident
);
122 * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
125 static int __devinit
assign_all_busses(const struct dmi_system_id
*d
)
127 pci_probe
|= PCI_ASSIGN_ALL_BUSSES
;
128 printk(KERN_INFO
"%s detected: enabling PCI bus# renumbering"
129 " (pci=assign-busses)\n", d
->ident
);
134 static struct dmi_system_id __devinitdata pciprobe_dmi_table
[] = {
137 * Laptops which need pci=assign-busses to see Cardbus cards
140 .callback
= assign_all_busses
,
141 .ident
= "Samsung X20 Laptop",
143 DMI_MATCH(DMI_SYS_VENDOR
, "Samsung Electronics"),
144 DMI_MATCH(DMI_PRODUCT_NAME
, "SX20S"),
147 #endif /* __i386__ */
149 .callback
= set_bf_sort
,
150 .ident
= "Dell PowerEdge 1950",
152 DMI_MATCH(DMI_SYS_VENDOR
, "Dell"),
153 DMI_MATCH(DMI_PRODUCT_NAME
, "PowerEdge 1950"),
157 .callback
= set_bf_sort
,
158 .ident
= "Dell PowerEdge 1955",
160 DMI_MATCH(DMI_SYS_VENDOR
, "Dell"),
161 DMI_MATCH(DMI_PRODUCT_NAME
, "PowerEdge 1955"),
165 .callback
= set_bf_sort
,
166 .ident
= "Dell PowerEdge 2900",
168 DMI_MATCH(DMI_SYS_VENDOR
, "Dell"),
169 DMI_MATCH(DMI_PRODUCT_NAME
, "PowerEdge 2900"),
173 .callback
= set_bf_sort
,
174 .ident
= "Dell PowerEdge 2950",
176 DMI_MATCH(DMI_SYS_VENDOR
, "Dell"),
177 DMI_MATCH(DMI_PRODUCT_NAME
, "PowerEdge 2950"),
181 .callback
= set_bf_sort
,
182 .ident
= "Dell PowerEdge R900",
184 DMI_MATCH(DMI_SYS_VENDOR
, "Dell"),
185 DMI_MATCH(DMI_PRODUCT_NAME
, "PowerEdge R900"),
189 .callback
= set_bf_sort
,
190 .ident
= "HP ProLiant BL20p G3",
192 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
193 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL20p G3"),
197 .callback
= set_bf_sort
,
198 .ident
= "HP ProLiant BL20p G4",
200 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
201 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL20p G4"),
205 .callback
= set_bf_sort
,
206 .ident
= "HP ProLiant BL30p G1",
208 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
209 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL30p G1"),
213 .callback
= set_bf_sort
,
214 .ident
= "HP ProLiant BL25p G1",
216 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
217 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL25p G1"),
221 .callback
= set_bf_sort
,
222 .ident
= "HP ProLiant BL35p G1",
224 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
225 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL35p G1"),
229 .callback
= set_bf_sort
,
230 .ident
= "HP ProLiant BL45p G1",
232 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
233 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL45p G1"),
237 .callback
= set_bf_sort
,
238 .ident
= "HP ProLiant BL45p G2",
240 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
241 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL45p G2"),
245 .callback
= set_bf_sort
,
246 .ident
= "HP ProLiant BL460c G1",
248 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
249 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL460c G1"),
253 .callback
= set_bf_sort
,
254 .ident
= "HP ProLiant BL465c G1",
256 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
257 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL465c G1"),
261 .callback
= set_bf_sort
,
262 .ident
= "HP ProLiant BL480c G1",
264 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
265 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL480c G1"),
269 .callback
= set_bf_sort
,
270 .ident
= "HP ProLiant BL685c G1",
272 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
273 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL685c G1"),
277 .callback
= set_bf_sort
,
278 .ident
= "HP ProLiant DL385 G2",
280 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
281 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant DL385 G2"),
285 .callback
= set_bf_sort
,
286 .ident
= "HP ProLiant DL585 G2",
288 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
289 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant DL585 G2"),
294 .callback
= assign_all_busses
,
295 .ident
= "Compaq EVO N800c",
297 DMI_MATCH(DMI_SYS_VENDOR
, "Compaq"),
298 DMI_MATCH(DMI_PRODUCT_NAME
, "EVO N800c"),
303 .callback
= set_bf_sort
,
304 .ident
= "HP ProLiant DL385 G2",
306 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
307 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant DL385 G2"),
311 .callback
= set_bf_sort
,
312 .ident
= "HP ProLiant DL585 G2",
314 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
315 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant DL585 G2"),
321 struct pci_bus
* __devinit
pcibios_scan_root(int busnum
)
323 struct pci_bus
*bus
= NULL
;
324 struct pci_sysdata
*sd
;
326 dmi_check_system(pciprobe_dmi_table
);
328 while ((bus
= pci_find_next_bus(bus
)) != NULL
) {
329 if (bus
->number
== busnum
) {
330 /* Already scanned */
335 /* Allocate per-root-bus (not per bus) arch-specific data.
336 * TODO: leak; this memory is never freed.
337 * It's arguable whether it's worth the trouble to care.
339 sd
= kzalloc(sizeof(*sd
), GFP_KERNEL
);
341 printk(KERN_ERR
"PCI: OOM, not probing PCI bus %02x\n", busnum
);
345 sd
->node
= get_mp_bus_to_node(busnum
);
347 printk(KERN_DEBUG
"PCI: Probing PCI hardware (bus %02x)\n", busnum
);
348 bus
= pci_scan_bus_parented(NULL
, busnum
, &pci_root_ops
, sd
);
355 extern u8 pci_cache_line_size
;
357 static int __init
pcibios_init(void)
359 struct cpuinfo_x86
*c
= &boot_cpu_data
;
362 printk(KERN_WARNING
"PCI: System does not support PCI\n");
367 * Assume PCI cacheline size of 32 bytes for all x86s except K7/K8
368 * and P4. It's also good for 386/486s (which actually have 16)
369 * as quite a few PCI devices do not support smaller values.
371 pci_cache_line_size
= 32 >> 2;
372 if (c
->x86
>= 6 && c
->x86_vendor
== X86_VENDOR_AMD
)
373 pci_cache_line_size
= 64 >> 2; /* K7 & K8 */
374 else if (c
->x86
> 6 && c
->x86_vendor
== X86_VENDOR_INTEL
)
375 pci_cache_line_size
= 128 >> 2; /* P4 */
377 pcibios_resource_survey();
379 if (pci_bf_sort
>= pci_force_bf
)
380 pci_sort_breadthfirst();
384 subsys_initcall(pcibios_init
);
386 char * __devinit
pcibios_setup(char *str
)
388 if (!strcmp(str
, "off")) {
391 } else if (!strcmp(str
, "bfsort")) {
392 pci_bf_sort
= pci_force_bf
;
394 } else if (!strcmp(str
, "nobfsort")) {
395 pci_bf_sort
= pci_force_nobf
;
398 #ifdef CONFIG_PCI_BIOS
399 else if (!strcmp(str
, "bios")) {
400 pci_probe
= PCI_PROBE_BIOS
;
402 } else if (!strcmp(str
, "nobios")) {
403 pci_probe
&= ~PCI_PROBE_BIOS
;
405 } else if (!strcmp(str
, "biosirq")) {
406 pci_probe
|= PCI_BIOS_IRQ_SCAN
;
408 } else if (!strncmp(str
, "pirqaddr=", 9)) {
409 pirq_table_addr
= simple_strtoul(str
+9, NULL
, 0);
413 #ifdef CONFIG_PCI_DIRECT
414 else if (!strcmp(str
, "conf1")) {
415 pci_probe
= PCI_PROBE_CONF1
| PCI_NO_CHECKS
;
418 else if (!strcmp(str
, "conf2")) {
419 pci_probe
= PCI_PROBE_CONF2
| PCI_NO_CHECKS
;
423 #ifdef CONFIG_PCI_MMCONFIG
424 else if (!strcmp(str
, "nommconf")) {
425 pci_probe
&= ~PCI_PROBE_MMCONF
;
428 else if (!strcmp(str
, "check_enable_amd_mmconf")) {
429 pci_probe
|= PCI_CHECK_ENABLE_AMD_MMCONF
;
433 else if (!strcmp(str
, "noacpi")) {
437 else if (!strcmp(str
, "noearly")) {
438 pci_probe
|= PCI_PROBE_NOEARLY
;
441 #ifndef CONFIG_X86_VISWS
442 else if (!strcmp(str
, "usepirqmask")) {
443 pci_probe
|= PCI_USE_PIRQ_MASK
;
445 } else if (!strncmp(str
, "irqmask=", 8)) {
446 pcibios_irq_mask
= simple_strtol(str
+8, NULL
, 0);
448 } else if (!strncmp(str
, "lastbus=", 8)) {
449 pcibios_last_bus
= simple_strtol(str
+8, NULL
, 0);
453 else if (!strcmp(str
, "rom")) {
454 pci_probe
|= PCI_ASSIGN_ROMS
;
456 } else if (!strcmp(str
, "assign-busses")) {
457 pci_probe
|= PCI_ASSIGN_ALL_BUSSES
;
459 } else if (!strcmp(str
, "use_crs")) {
460 pci_probe
|= PCI_USE__CRS
;
462 } else if (!strcmp(str
, "routeirq")) {
469 unsigned int pcibios_assign_all_busses(void)
471 return (pci_probe
& PCI_ASSIGN_ALL_BUSSES
) ? 1 : 0;
474 int pcibios_enable_device(struct pci_dev
*dev
, int mask
)
478 if ((err
= pci_enable_resources(dev
, mask
)) < 0)
481 if (!dev
->msi_enabled
)
482 return pcibios_enable_irq(dev
);
486 void pcibios_disable_device (struct pci_dev
*dev
)
488 if (!dev
->msi_enabled
&& pcibios_disable_irq
)
489 pcibios_disable_irq(dev
);
492 struct pci_bus
*pci_scan_bus_on_node(int busno
, struct pci_ops
*ops
, int node
)
494 struct pci_bus
*bus
= NULL
;
495 struct pci_sysdata
*sd
;
498 * Allocate per-root-bus (not per bus) arch-specific data.
499 * TODO: leak; this memory is never freed.
500 * It's arguable whether it's worth the trouble to care.
502 sd
= kzalloc(sizeof(*sd
), GFP_KERNEL
);
504 printk(KERN_ERR
"PCI: OOM, skipping PCI bus %02x\n", busno
);
508 bus
= pci_scan_bus(busno
, ops
, sd
);
515 struct pci_bus
*pci_scan_bus_with_sysdata(int busno
)
517 return pci_scan_bus_on_node(busno
, &pci_root_ops
, -1);