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
;
30 static int pci_read(struct pci_bus
*bus
, unsigned int devfn
, int where
, int size
, u32
*value
)
32 return raw_pci_ops
->read(0, bus
->number
, devfn
, where
, size
, value
);
35 static int pci_write(struct pci_bus
*bus
, unsigned int devfn
, int where
, int size
, u32 value
)
37 return raw_pci_ops
->write(0, bus
->number
, devfn
, where
, size
, value
);
40 struct pci_ops pci_root_ops
= {
46 * legacy, numa, and acpi all want to call pcibios_scan_root
47 * from their initcalls. This flag prevents that.
52 * This interrupt-safe spinlock protects all accesses to PCI
53 * configuration space.
55 DEFINE_SPINLOCK(pci_config_lock
);
58 * Several buggy motherboards address only 16 devices and mirror
59 * them to next 16 IDs. We try to detect this `feature' on all
60 * primary buses (those containing host bridges as they are
61 * expected to be unique) and remove the ghost devices.
64 static void __devinit
pcibios_fixup_ghosts(struct pci_bus
*b
)
66 struct list_head
*ln
, *mn
;
67 struct pci_dev
*d
, *e
;
68 int mirror
= PCI_DEVFN(16,0);
69 int seen_host_bridge
= 0;
72 DBG("PCI: Scanning for ghost devices on bus %d\n", b
->number
);
73 list_for_each(ln
, &b
->devices
) {
75 if ((d
->class >> 8) == PCI_CLASS_BRIDGE_HOST
)
77 for (mn
=ln
->next
; mn
!= &b
->devices
; mn
=mn
->next
) {
79 if (e
->devfn
!= d
->devfn
+ mirror
||
80 e
->vendor
!= d
->vendor
||
81 e
->device
!= d
->device
||
84 for(i
=0; i
<PCI_NUM_RESOURCES
; i
++)
85 if (e
->resource
[i
].start
!= d
->resource
[i
].start
||
86 e
->resource
[i
].end
!= d
->resource
[i
].end
||
87 e
->resource
[i
].flags
!= d
->resource
[i
].flags
)
91 if (mn
== &b
->devices
)
94 if (!seen_host_bridge
)
96 printk(KERN_WARNING
"PCI: Ignoring ghost devices on bus %02x\n", b
->number
);
99 while (ln
->next
!= &b
->devices
) {
100 d
= pci_dev_b(ln
->next
);
101 if (d
->devfn
>= mirror
) {
102 list_del(&d
->global_list
);
103 list_del(&d
->bus_list
);
111 * Called after each bus is probed, but before its children
115 void __devinit
pcibios_fixup_bus(struct pci_bus
*b
)
117 pcibios_fixup_ghosts(b
);
118 pci_read_bridge_bases(b
);
122 * Only use DMI information to set this if nothing was passed
123 * on the kernel command line (which was parsed earlier).
126 static int __devinit
set_bf_sort(struct dmi_system_id
*d
)
128 if (pci_bf_sort
== pci_bf_sort_default
) {
129 pci_bf_sort
= pci_dmi_bf
;
130 printk(KERN_INFO
"PCI: %s detected, enabling pci=bfsort.\n", d
->ident
);
136 * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
139 static int __devinit
assign_all_busses(struct dmi_system_id
*d
)
141 pci_probe
|= PCI_ASSIGN_ALL_BUSSES
;
142 printk(KERN_INFO
"%s detected: enabling PCI bus# renumbering"
143 " (pci=assign-busses)\n", d
->ident
);
148 static struct dmi_system_id __devinitdata pciprobe_dmi_table
[] = {
151 * Laptops which need pci=assign-busses to see Cardbus cards
154 .callback
= assign_all_busses
,
155 .ident
= "Samsung X20 Laptop",
157 DMI_MATCH(DMI_SYS_VENDOR
, "Samsung Electronics"),
158 DMI_MATCH(DMI_PRODUCT_NAME
, "SX20S"),
161 #endif /* __i386__ */
163 .callback
= set_bf_sort
,
164 .ident
= "Dell PowerEdge 1950",
166 DMI_MATCH(DMI_SYS_VENDOR
, "Dell"),
167 DMI_MATCH(DMI_PRODUCT_NAME
, "PowerEdge 1950"),
171 .callback
= set_bf_sort
,
172 .ident
= "Dell PowerEdge 1955",
174 DMI_MATCH(DMI_SYS_VENDOR
, "Dell"),
175 DMI_MATCH(DMI_PRODUCT_NAME
, "PowerEdge 1955"),
179 .callback
= set_bf_sort
,
180 .ident
= "Dell PowerEdge 2900",
182 DMI_MATCH(DMI_SYS_VENDOR
, "Dell"),
183 DMI_MATCH(DMI_PRODUCT_NAME
, "PowerEdge 2900"),
187 .callback
= set_bf_sort
,
188 .ident
= "Dell PowerEdge 2950",
190 DMI_MATCH(DMI_SYS_VENDOR
, "Dell"),
191 DMI_MATCH(DMI_PRODUCT_NAME
, "PowerEdge 2950"),
195 .callback
= set_bf_sort
,
196 .ident
= "HP ProLiant BL20p G3",
198 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
199 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL20p G3"),
203 .callback
= set_bf_sort
,
204 .ident
= "HP ProLiant BL20p G4",
206 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
207 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL20p G4"),
211 .callback
= set_bf_sort
,
212 .ident
= "HP ProLiant BL30p G1",
214 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
215 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL30p G1"),
219 .callback
= set_bf_sort
,
220 .ident
= "HP ProLiant BL25p G1",
222 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
223 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL25p G1"),
227 .callback
= set_bf_sort
,
228 .ident
= "HP ProLiant BL35p G1",
230 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
231 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL35p G1"),
235 .callback
= set_bf_sort
,
236 .ident
= "HP ProLiant BL45p G1",
238 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
239 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL45p G1"),
243 .callback
= set_bf_sort
,
244 .ident
= "HP ProLiant BL45p G2",
246 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
247 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL45p G2"),
251 .callback
= set_bf_sort
,
252 .ident
= "HP ProLiant BL460c G1",
254 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
255 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL460c G1"),
259 .callback
= set_bf_sort
,
260 .ident
= "HP ProLiant BL465c G1",
262 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
263 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL465c G1"),
267 .callback
= set_bf_sort
,
268 .ident
= "HP ProLiant BL480c G1",
270 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
271 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL480c G1"),
275 .callback
= set_bf_sort
,
276 .ident
= "HP ProLiant BL685c G1",
278 DMI_MATCH(DMI_SYS_VENDOR
, "HP"),
279 DMI_MATCH(DMI_PRODUCT_NAME
, "ProLiant BL685c G1"),
285 struct pci_bus
* __devinit
pcibios_scan_root(int busnum
)
287 struct pci_bus
*bus
= NULL
;
289 dmi_check_system(pciprobe_dmi_table
);
291 while ((bus
= pci_find_next_bus(bus
)) != NULL
) {
292 if (bus
->number
== busnum
) {
293 /* Already scanned */
298 printk(KERN_DEBUG
"PCI: Probing PCI hardware (bus %02x)\n", busnum
);
300 return pci_scan_bus_parented(NULL
, busnum
, &pci_root_ops
, NULL
);
303 extern u8 pci_cache_line_size
;
305 static int __init
pcibios_init(void)
307 struct cpuinfo_x86
*c
= &boot_cpu_data
;
310 printk(KERN_WARNING
"PCI: System does not support PCI\n");
315 * Assume PCI cacheline size of 32 bytes for all x86s except K7/K8
316 * and P4. It's also good for 386/486s (which actually have 16)
317 * as quite a few PCI devices do not support smaller values.
319 pci_cache_line_size
= 32 >> 2;
320 if (c
->x86
>= 6 && c
->x86_vendor
== X86_VENDOR_AMD
)
321 pci_cache_line_size
= 64 >> 2; /* K7 & K8 */
322 else if (c
->x86
> 6 && c
->x86_vendor
== X86_VENDOR_INTEL
)
323 pci_cache_line_size
= 128 >> 2; /* P4 */
325 pcibios_resource_survey();
327 if (pci_bf_sort
>= pci_force_bf
)
328 pci_sort_breadthfirst();
329 #ifdef CONFIG_PCI_BIOS
330 if ((pci_probe
& PCI_BIOS_SORT
) && !(pci_probe
& PCI_NO_SORT
))
336 subsys_initcall(pcibios_init
);
338 char * __devinit
pcibios_setup(char *str
)
340 if (!strcmp(str
, "off")) {
343 } else if (!strcmp(str
, "bfsort")) {
344 pci_bf_sort
= pci_force_bf
;
346 } else if (!strcmp(str
, "nobfsort")) {
347 pci_bf_sort
= pci_force_nobf
;
350 #ifdef CONFIG_PCI_BIOS
351 else if (!strcmp(str
, "bios")) {
352 pci_probe
= PCI_PROBE_BIOS
;
354 } else if (!strcmp(str
, "nobios")) {
355 pci_probe
&= ~PCI_PROBE_BIOS
;
357 } else if (!strcmp(str
, "nosort")) {
358 pci_probe
|= PCI_NO_SORT
;
360 } else if (!strcmp(str
, "biosirq")) {
361 pci_probe
|= PCI_BIOS_IRQ_SCAN
;
363 } else if (!strncmp(str
, "pirqaddr=", 9)) {
364 pirq_table_addr
= simple_strtoul(str
+9, NULL
, 0);
368 #ifdef CONFIG_PCI_DIRECT
369 else if (!strcmp(str
, "conf1")) {
370 pci_probe
= PCI_PROBE_CONF1
| PCI_NO_CHECKS
;
373 else if (!strcmp(str
, "conf2")) {
374 pci_probe
= PCI_PROBE_CONF2
| PCI_NO_CHECKS
;
378 #ifdef CONFIG_PCI_MMCONFIG
379 else if (!strcmp(str
, "nommconf")) {
380 pci_probe
&= ~PCI_PROBE_MMCONF
;
384 else if (!strcmp(str
, "noacpi")) {
388 else if (!strcmp(str
, "noearly")) {
389 pci_probe
|= PCI_PROBE_NOEARLY
;
392 #ifndef CONFIG_X86_VISWS
393 else if (!strcmp(str
, "usepirqmask")) {
394 pci_probe
|= PCI_USE_PIRQ_MASK
;
396 } else if (!strncmp(str
, "irqmask=", 8)) {
397 pcibios_irq_mask
= simple_strtol(str
+8, NULL
, 0);
399 } else if (!strncmp(str
, "lastbus=", 8)) {
400 pcibios_last_bus
= simple_strtol(str
+8, NULL
, 0);
404 else if (!strcmp(str
, "rom")) {
405 pci_probe
|= PCI_ASSIGN_ROMS
;
407 } else if (!strcmp(str
, "assign-busses")) {
408 pci_probe
|= PCI_ASSIGN_ALL_BUSSES
;
410 } else if (!strcmp(str
, "routeirq")) {
417 unsigned int pcibios_assign_all_busses(void)
419 return (pci_probe
& PCI_ASSIGN_ALL_BUSSES
) ? 1 : 0;
422 int pcibios_enable_device(struct pci_dev
*dev
, int mask
)
426 if ((err
= pcibios_enable_resources(dev
, mask
)) < 0)
429 return pcibios_enable_irq(dev
);
432 void pcibios_disable_device (struct pci_dev
*dev
)
434 if (pcibios_disable_irq
)
435 pcibios_disable_irq(dev
);