2 * Common pmac/prep/chrp pci routines. -- Cort
5 #include <linux/kernel.h>
7 #include <linux/delay.h>
8 #include <linux/string.h>
9 #include <linux/init.h>
10 #include <linux/capability.h>
11 #include <linux/sched.h>
12 #include <linux/errno.h>
13 #include <linux/bootmem.h>
14 #include <linux/irq.h>
15 #include <linux/list.h>
18 #include <asm/processor.h>
21 #include <asm/sections.h>
22 #include <asm/pci-bridge.h>
23 #include <asm/byteorder.h>
24 #include <asm/uaccess.h>
25 #include <asm/machdep.h>
30 #define DBG(x...) printk(x)
35 unsigned long isa_io_base = 0;
36 unsigned long pci_dram_offset = 0;
37 int pcibios_assign_bus_offset = 1;
39 void pcibios_make_OF_bus_map(void);
41 static void fixup_broken_pcnet32(struct pci_dev* dev);
42 static void fixup_cpc710_pci64(struct pci_dev* dev);
44 static u8* pci_to_OF_bus_map;
47 /* By default, we don't re-assign bus numbers. We do this only on
50 static int pci_assign_all_buses;
54 static int pci_bus_count;
56 /* This will remain NULL for now, until isa-bridge.c is made common
57 * to both 32-bit and 64-bit.
59 struct pci_dev *isa_bridge_pcidev;
60 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
63 fixup_hide_host_resource_fsl(struct pci_dev *dev)
65 int i, class = dev->class >> 8;
67 if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
68 class == PCI_CLASS_BRIDGE_OTHER) &&
69 (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
70 (dev->bus->parent == NULL)) {
71 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
72 dev->resource[i].start = 0;
73 dev->resource[i].end = 0;
74 dev->resource[i].flags = 0;
78 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);
79 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);
82 fixup_broken_pcnet32(struct pci_dev* dev)
84 if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {
85 dev->vendor = PCI_VENDOR_ID_AMD;
86 pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD);
89 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID, fixup_broken_pcnet32);
92 fixup_cpc710_pci64(struct pci_dev* dev)
94 /* Hide the PCI64 BARs from the kernel as their content doesn't
95 * fit well in the resource management
97 dev->resource[0].start = dev->resource[0].end = 0;
98 dev->resource[0].flags = 0;
99 dev->resource[1].start = dev->resource[1].end = 0;
100 dev->resource[1].flags = 0;
102 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
106 * Functions below are used on OpenFirmware machines.
109 make_one_node_map(struct device_node* node, u8 pci_bus)
111 const int *bus_range;
114 if (pci_bus >= pci_bus_count)
116 bus_range = of_get_property(node, "bus-range", &len);
117 if (bus_range == NULL || len < 2 * sizeof(int)) {
118 printk(KERN_WARNING "Can't get bus-range for %s, "
119 "assuming it starts at 0\n", node->full_name);
120 pci_to_OF_bus_map[pci_bus] = 0;
122 pci_to_OF_bus_map[pci_bus] = bus_range[0];
124 for_each_child_of_node(node, node) {
126 const unsigned int *class_code, *reg;
128 class_code = of_get_property(node, "class-code", NULL);
129 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
130 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
132 reg = of_get_property(node, "reg", NULL);
135 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
136 if (!dev || !dev->subordinate) {
140 make_one_node_map(node, dev->subordinate->number);
146 pcibios_make_OF_bus_map(void)
149 struct pci_controller *hose, *tmp;
150 struct property *map_prop;
151 struct device_node *dn;
153 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
154 if (!pci_to_OF_bus_map) {
155 printk(KERN_ERR "Can't allocate OF bus map !\n");
159 /* We fill the bus map with invalid values, that helps
162 for (i=0; i<pci_bus_count; i++)
163 pci_to_OF_bus_map[i] = 0xff;
165 /* For each hose, we begin searching bridges */
166 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
167 struct device_node* node = hose->dn;
171 make_one_node_map(node, hose->first_busno);
173 dn = of_find_node_by_path("/");
174 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
176 BUG_ON(pci_bus_count > map_prop->length);
177 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
181 printk("PCI->OF bus map:\n");
182 for (i=0; i<pci_bus_count; i++) {
183 if (pci_to_OF_bus_map[i] == 0xff)
185 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
190 typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);
192 static struct device_node*
193 scan_OF_pci_childs(struct device_node *parent, pci_OF_scan_iterator filter, void* data)
195 struct device_node *node;
196 struct device_node* sub_node;
198 for_each_child_of_node(parent, node) {
199 const unsigned int *class_code;
201 if (filter(node, data)) {
206 /* For PCI<->PCI bridges or CardBus bridges, we go down
207 * Note: some OFs create a parent node "multifunc-device" as
208 * a fake root for all functions of a multi-function device,
209 * we go down them as well.
211 class_code = of_get_property(node, "class-code", NULL);
212 if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
213 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
214 strcmp(node->name, "multifunc-device"))
216 sub_node = scan_OF_pci_childs(node, filter, data);
225 static struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
228 struct device_node *np;
232 for_each_child_of_node(parent, np) {
233 reg = of_get_property(np, "reg", &psize);
234 if (reg == NULL || psize < 4)
236 if (((reg[0] >> 8) & 0xff) == devfn)
243 static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
245 struct device_node *parent, *np;
247 /* Are we a root bus ? */
248 if (bus->self == NULL || bus->parent == NULL) {
249 struct pci_controller *hose = pci_bus_to_host(bus);
252 return of_node_get(hose->dn);
255 /* not a root bus, we need to get our parent */
256 parent = scan_OF_for_pci_bus(bus->parent);
260 /* now iterate for children for a match */
261 np = scan_OF_for_pci_dev(parent, bus->self->devfn);
268 * Scans the OF tree for a device node matching a PCI device
271 pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
273 struct device_node *parent, *np;
278 DBG("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
279 parent = scan_OF_for_pci_bus(bus);
282 DBG(" parent is %s\n", parent ? parent->full_name : "<NULL>");
283 np = scan_OF_for_pci_dev(parent, devfn);
285 DBG(" result is %s\n", np ? np->full_name : "<NULL>");
287 /* XXX most callers don't release the returned node
288 * mostly because ppc64 doesn't increase the refcount,
289 * we need to fix that.
293 EXPORT_SYMBOL(pci_busdev_to_OF_node);
296 pci_device_to_OF_node(struct pci_dev *dev)
298 return pci_busdev_to_OF_node(dev->bus, dev->devfn);
300 EXPORT_SYMBOL(pci_device_to_OF_node);
303 find_OF_pci_device_filter(struct device_node* node, void* data)
305 return ((void *)node == data);
309 * Returns the PCI device matching a given OF node
312 pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
314 const unsigned int *reg;
315 struct pci_controller* hose;
316 struct pci_dev* dev = NULL;
320 /* Make sure it's really a PCI device */
321 hose = pci_find_hose_for_OF_device(node);
322 if (!hose || !hose->dn)
324 if (!scan_OF_pci_childs(hose->dn,
325 find_OF_pci_device_filter, (void *)node))
327 reg = of_get_property(node, "reg", NULL);
330 *bus = (reg[0] >> 16) & 0xff;
331 *devfn = ((reg[0] >> 8) & 0xff);
333 /* Ok, here we need some tweak. If we have already renumbered
334 * all busses, we can't rely on the OF bus number any more.
335 * the pci_to_OF_bus_map is not enough as several PCI busses
336 * may match the same OF bus number.
338 if (!pci_to_OF_bus_map)
341 for_each_pci_dev(dev)
342 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
343 dev->devfn == *devfn) {
344 *bus = dev->bus->number;
351 EXPORT_SYMBOL(pci_device_from_OF_node);
353 /* We create the "pci-OF-bus-map" property now so it appears in the
357 pci_create_OF_bus_map(void)
359 struct property* of_prop;
360 struct device_node *dn;
362 of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
365 dn = of_find_node_by_path("/");
367 memset(of_prop, -1, sizeof(struct property) + 256);
368 of_prop->name = "pci-OF-bus-map";
369 of_prop->length = 256;
370 of_prop->value = &of_prop[1];
371 prom_add_property(dn, of_prop);
376 #else /* CONFIG_PPC_OF */
377 void pcibios_make_OF_bus_map(void)
380 #endif /* CONFIG_PPC_OF */
382 static int __init pcibios_init(void)
384 struct pci_controller *hose, *tmp;
388 printk(KERN_INFO "PCI: Probing PCI hardware\n");
390 if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS)
391 pci_assign_all_buses = 1;
393 /* Scan all of the recorded PCI controllers. */
394 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
395 if (pci_assign_all_buses)
396 hose->first_busno = next_busno;
397 hose->last_busno = 0xff;
398 bus = pci_scan_bus_parented(hose->parent, hose->first_busno,
401 pci_bus_add_devices(bus);
402 hose->last_busno = bus->subordinate;
404 if (pci_assign_all_buses || next_busno <= hose->last_busno)
405 next_busno = hose->last_busno + pcibios_assign_bus_offset;
407 pci_bus_count = next_busno;
409 /* OpenFirmware based machines need a map of OF bus
410 * numbers vs. kernel bus numbers since we may have to
413 if (pci_assign_all_buses && have_of)
414 pcibios_make_OF_bus_map();
416 /* Call common code to handle resource allocation */
417 pcibios_resource_survey();
419 /* Call machine dependent post-init code */
420 if (ppc_md.pcibios_after_init)
421 ppc_md.pcibios_after_init();
426 subsys_initcall(pcibios_init);
428 void __devinit pcibios_do_bus_setup(struct pci_bus *bus)
430 struct pci_controller *hose = (struct pci_controller *) bus->sysdata;
431 unsigned long io_offset;
432 struct resource *res;
436 /* Hookup PHB resources */
437 io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
438 if (bus->parent == NULL) {
439 /* This is a host bridge - fill in its resources */
442 bus->resource[0] = res = &hose->io_resource;
445 printk(KERN_ERR "I/O resource not set for host"
446 " bridge %d\n", hose->global_number);
448 res->end = IO_SPACE_LIMIT;
449 res->flags = IORESOURCE_IO;
451 res->start = (res->start + io_offset) & 0xffffffffu;
452 res->end = (res->end + io_offset) & 0xffffffffu;
454 for (i = 0; i < 3; ++i) {
455 res = &hose->mem_resources[i];
459 printk(KERN_ERR "Memory resource not set for "
460 "host bridge %d\n", hose->global_number);
461 res->start = hose->pci_mem_offset;
463 res->flags = IORESOURCE_MEM;
465 bus->resource[i+1] = res;
469 if (ppc_md.pci_dma_bus_setup)
470 ppc_md.pci_dma_bus_setup(bus);
472 list_for_each_entry(dev, &bus->devices, bus_list)
473 pcibios_setup_new_device(dev);
476 /* the next one is stolen from the alpha port... */
478 pcibios_update_irq(struct pci_dev *dev, int irq)
480 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
481 /* XXX FIXME - update OF device tree node interrupt property */
484 static struct pci_controller*
485 pci_bus_to_hose(int bus)
487 struct pci_controller *hose, *tmp;
489 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
490 if (bus >= hose->first_busno && bus <= hose->last_busno)
495 /* Provide information on locations of various I/O regions in physical
496 * memory. Do this on a per-card basis so that we choose the right
498 * Note that the returned IO or memory base is a physical address
501 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
503 struct pci_controller* hose;
504 long result = -EOPNOTSUPP;
506 hose = pci_bus_to_hose(bus);
511 case IOBASE_BRIDGE_NUMBER:
512 return (long)hose->first_busno;
514 return (long)hose->pci_mem_offset;
516 return (long)hose->io_base_phys;
518 return (long)isa_io_base;
520 return (long)isa_mem_base;
526 unsigned long pci_address_to_pio(phys_addr_t address)
528 struct pci_controller *hose, *tmp;
530 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
531 unsigned int size = hose->io_resource.end -
532 hose->io_resource.start + 1;
533 if (address >= hose->io_base_phys &&
534 address < (hose->io_base_phys + size)) {
536 (unsigned long)hose->io_base_virt - _IO_BASE;
537 return base + (address - hose->io_base_phys);
540 return (unsigned int)-1;
542 EXPORT_SYMBOL(pci_address_to_pio);
545 * Null PCI config access functions, for the case when we can't
548 #define NULL_PCI_OP(rw, size, type) \
550 null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \
552 return PCIBIOS_DEVICE_NOT_FOUND; \
556 null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
559 return PCIBIOS_DEVICE_NOT_FOUND;
563 null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
566 return PCIBIOS_DEVICE_NOT_FOUND;
569 static struct pci_ops null_pci_ops =
571 .read = null_read_config,
572 .write = null_write_config,
576 * These functions are used early on before PCI scanning is done
577 * and all of the pci_dev and pci_bus structures have been created.
579 static struct pci_bus *
580 fake_pci_bus(struct pci_controller *hose, int busnr)
582 static struct pci_bus bus;
585 hose = pci_bus_to_hose(busnr);
587 printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
591 bus.ops = hose? hose->ops: &null_pci_ops;
595 #define EARLY_PCI_OP(rw, size, type) \
596 int early_##rw##_config_##size(struct pci_controller *hose, int bus, \
597 int devfn, int offset, type value) \
599 return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \
600 devfn, offset, value); \
603 EARLY_PCI_OP(read, byte, u8 *)
604 EARLY_PCI_OP(read, word, u16 *)
605 EARLY_PCI_OP(read, dword, u32 *)
606 EARLY_PCI_OP(write, byte, u8)
607 EARLY_PCI_OP(write, word, u16)
608 EARLY_PCI_OP(write, dword, u32)
610 extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int cap);
611 int early_find_capability(struct pci_controller *hose, int bus, int devfn,
614 return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);