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;
429 else if (!strcmp(str, "noacpi")) {
433 else if (!strcmp(str, "noearly")) {
434 pci_probe |= PCI_PROBE_NOEARLY;
437 #ifndef CONFIG_X86_VISWS
438 else if (!strcmp(str, "usepirqmask")) {
439 pci_probe |= PCI_USE_PIRQ_MASK;
441 } else if (!strncmp(str, "irqmask=", 8)) {
442 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
444 } else if (!strncmp(str, "lastbus=", 8)) {
445 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
449 else if (!strcmp(str, "rom")) {
450 pci_probe |= PCI_ASSIGN_ROMS;
452 } else if (!strcmp(str, "assign-busses")) {
453 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
455 } else if (!strcmp(str, "use_crs")) {
456 pci_probe |= PCI_USE__CRS;
458 } else if (!strcmp(str, "routeirq")) {
465 unsigned int pcibios_assign_all_busses(void)
467 return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
470 int pcibios_enable_device(struct pci_dev *dev, int mask)
474 if ((err = pci_enable_resources(dev, mask)) < 0)
477 if (!dev->msi_enabled)
478 return pcibios_enable_irq(dev);
482 void pcibios_disable_device (struct pci_dev *dev)
484 if (!dev->msi_enabled && pcibios_disable_irq)
485 pcibios_disable_irq(dev);
488 struct pci_bus *pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
490 struct pci_bus *bus = NULL;
491 struct pci_sysdata *sd;
494 * Allocate per-root-bus (not per bus) arch-specific data.
495 * TODO: leak; this memory is never freed.
496 * It's arguable whether it's worth the trouble to care.
498 sd = kzalloc(sizeof(*sd), GFP_KERNEL);
500 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
504 bus = pci_scan_bus(busno, ops, sd);
511 struct pci_bus *pci_scan_bus_with_sysdata(int busno)
513 return pci_scan_bus_on_node(busno, &pci_root_ops, -1);