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/ppc-pci.h>
24 #include <asm/byteorder.h>
25 #include <asm/uaccess.h>
26 #include <asm/machdep.h>
30 unsigned long isa_io_base = 0;
31 unsigned long pci_dram_offset = 0;
32 int pcibios_assign_bus_offset = 1;
34 void pcibios_make_OF_bus_map(void);
36 static void fixup_broken_pcnet32(struct pci_dev* dev);
37 static void fixup_cpc710_pci64(struct pci_dev* dev);
39 static u8* pci_to_OF_bus_map;
42 /* By default, we don't re-assign bus numbers. We do this only on
45 static int pci_assign_all_buses;
47 static int pci_bus_count;
49 /* This will remain NULL for now, until isa-bridge.c is made common
50 * to both 32-bit and 64-bit.
52 struct pci_dev *isa_bridge_pcidev;
53 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
56 fixup_hide_host_resource_fsl(struct pci_dev *dev)
58 int i, class = dev->class >> 8;
60 if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
61 class == PCI_CLASS_BRIDGE_OTHER) &&
62 (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
63 (dev->bus->parent == NULL)) {
64 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
65 dev->resource[i].start = 0;
66 dev->resource[i].end = 0;
67 dev->resource[i].flags = 0;
71 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);
72 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);
75 fixup_broken_pcnet32(struct pci_dev* dev)
77 if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {
78 dev->vendor = PCI_VENDOR_ID_AMD;
79 pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD);
82 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID, fixup_broken_pcnet32);
85 fixup_cpc710_pci64(struct pci_dev* dev)
87 /* Hide the PCI64 BARs from the kernel as their content doesn't
88 * fit well in the resource management
90 dev->resource[0].start = dev->resource[0].end = 0;
91 dev->resource[0].flags = 0;
92 dev->resource[1].start = dev->resource[1].end = 0;
93 dev->resource[1].flags = 0;
95 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
99 * Functions below are used on OpenFirmware machines.
102 make_one_node_map(struct device_node* node, u8 pci_bus)
104 const int *bus_range;
107 if (pci_bus >= pci_bus_count)
109 bus_range = of_get_property(node, "bus-range", &len);
110 if (bus_range == NULL || len < 2 * sizeof(int)) {
111 printk(KERN_WARNING "Can't get bus-range for %s, "
112 "assuming it starts at 0\n", node->full_name);
113 pci_to_OF_bus_map[pci_bus] = 0;
115 pci_to_OF_bus_map[pci_bus] = bus_range[0];
117 for_each_child_of_node(node, node) {
119 const unsigned int *class_code, *reg;
121 class_code = of_get_property(node, "class-code", NULL);
122 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
123 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
125 reg = of_get_property(node, "reg", NULL);
128 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
129 if (!dev || !dev->subordinate) {
133 make_one_node_map(node, dev->subordinate->number);
139 pcibios_make_OF_bus_map(void)
142 struct pci_controller *hose, *tmp;
143 struct property *map_prop;
144 struct device_node *dn;
146 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
147 if (!pci_to_OF_bus_map) {
148 printk(KERN_ERR "Can't allocate OF bus map !\n");
152 /* We fill the bus map with invalid values, that helps
155 for (i=0; i<pci_bus_count; i++)
156 pci_to_OF_bus_map[i] = 0xff;
158 /* For each hose, we begin searching bridges */
159 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
160 struct device_node* node = hose->dn;
164 make_one_node_map(node, hose->first_busno);
166 dn = of_find_node_by_path("/");
167 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
169 BUG_ON(pci_bus_count > map_prop->length);
170 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
174 printk("PCI->OF bus map:\n");
175 for (i=0; i<pci_bus_count; i++) {
176 if (pci_to_OF_bus_map[i] == 0xff)
178 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
183 typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);
185 static struct device_node*
186 scan_OF_pci_childs(struct device_node *parent, pci_OF_scan_iterator filter, void* data)
188 struct device_node *node;
189 struct device_node* sub_node;
191 for_each_child_of_node(parent, node) {
192 const unsigned int *class_code;
194 if (filter(node, data)) {
199 /* For PCI<->PCI bridges or CardBus bridges, we go down
200 * Note: some OFs create a parent node "multifunc-device" as
201 * a fake root for all functions of a multi-function device,
202 * we go down them as well.
204 class_code = of_get_property(node, "class-code", NULL);
205 if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
206 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
207 strcmp(node->name, "multifunc-device"))
209 sub_node = scan_OF_pci_childs(node, filter, data);
218 static struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
221 struct device_node *np;
225 for_each_child_of_node(parent, np) {
226 reg = of_get_property(np, "reg", &psize);
227 if (reg == NULL || psize < 4)
229 if (((reg[0] >> 8) & 0xff) == devfn)
236 static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
238 struct device_node *parent, *np;
240 /* Are we a root bus ? */
241 if (bus->self == NULL || bus->parent == NULL) {
242 struct pci_controller *hose = pci_bus_to_host(bus);
245 return of_node_get(hose->dn);
248 /* not a root bus, we need to get our parent */
249 parent = scan_OF_for_pci_bus(bus->parent);
253 /* now iterate for children for a match */
254 np = scan_OF_for_pci_dev(parent, bus->self->devfn);
261 * Scans the OF tree for a device node matching a PCI device
264 pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
266 struct device_node *parent, *np;
268 pr_debug("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
269 parent = scan_OF_for_pci_bus(bus);
272 pr_debug(" parent is %s\n", parent ? parent->full_name : "<NULL>");
273 np = scan_OF_for_pci_dev(parent, devfn);
275 pr_debug(" result is %s\n", np ? np->full_name : "<NULL>");
277 /* XXX most callers don't release the returned node
278 * mostly because ppc64 doesn't increase the refcount,
279 * we need to fix that.
283 EXPORT_SYMBOL(pci_busdev_to_OF_node);
286 pci_device_to_OF_node(struct pci_dev *dev)
288 return pci_busdev_to_OF_node(dev->bus, dev->devfn);
290 EXPORT_SYMBOL(pci_device_to_OF_node);
293 find_OF_pci_device_filter(struct device_node* node, void* data)
295 return ((void *)node == data);
299 * Returns the PCI device matching a given OF node
302 pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
304 const unsigned int *reg;
305 struct pci_controller* hose;
306 struct pci_dev* dev = NULL;
308 /* Make sure it's really a PCI device */
309 hose = pci_find_hose_for_OF_device(node);
310 if (!hose || !hose->dn)
312 if (!scan_OF_pci_childs(hose->dn,
313 find_OF_pci_device_filter, (void *)node))
315 reg = of_get_property(node, "reg", NULL);
318 *bus = (reg[0] >> 16) & 0xff;
319 *devfn = ((reg[0] >> 8) & 0xff);
321 /* Ok, here we need some tweak. If we have already renumbered
322 * all busses, we can't rely on the OF bus number any more.
323 * the pci_to_OF_bus_map is not enough as several PCI busses
324 * may match the same OF bus number.
326 if (!pci_to_OF_bus_map)
329 for_each_pci_dev(dev)
330 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
331 dev->devfn == *devfn) {
332 *bus = dev->bus->number;
339 EXPORT_SYMBOL(pci_device_from_OF_node);
341 /* We create the "pci-OF-bus-map" property now so it appears in the
345 pci_create_OF_bus_map(void)
347 struct property* of_prop;
348 struct device_node *dn;
350 of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
353 dn = of_find_node_by_path("/");
355 memset(of_prop, -1, sizeof(struct property) + 256);
356 of_prop->name = "pci-OF-bus-map";
357 of_prop->length = 256;
358 of_prop->value = &of_prop[1];
359 prom_add_property(dn, of_prop);
364 #else /* CONFIG_PPC_OF */
365 void pcibios_make_OF_bus_map(void)
368 #endif /* CONFIG_PPC_OF */
370 static void __devinit pcibios_scan_phb(struct pci_controller *hose)
373 struct device_node *node = hose->dn;
374 unsigned long io_offset;
375 struct resource *res = &hose->io_resource;
377 pr_debug("PCI: Scanning PHB %s\n",
378 node ? node->full_name : "<NO NAME>");
380 /* Create an empty bus for the toplevel */
381 bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose);
383 printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
384 hose->global_number);
387 bus->secondary = hose->first_busno;
390 /* Fixup IO space offset */
391 io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
392 res->start = (res->start + io_offset) & 0xffffffffu;
393 res->end = (res->end + io_offset) & 0xffffffffu;
395 /* Wire up PHB bus resources */
396 pcibios_setup_phb_resources(hose);
399 hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
402 static int __init pcibios_init(void)
404 struct pci_controller *hose, *tmp;
407 printk(KERN_INFO "PCI: Probing PCI hardware\n");
409 if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS)
410 pci_assign_all_buses = 1;
412 /* Scan all of the recorded PCI controllers. */
413 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
414 if (pci_assign_all_buses)
415 hose->first_busno = next_busno;
416 hose->last_busno = 0xff;
417 pcibios_scan_phb(hose);
418 pci_bus_add_devices(hose->bus);
419 if (pci_assign_all_buses || next_busno <= hose->last_busno)
420 next_busno = hose->last_busno + pcibios_assign_bus_offset;
422 pci_bus_count = next_busno;
424 /* OpenFirmware based machines need a map of OF bus
425 * numbers vs. kernel bus numbers since we may have to
428 if (pci_assign_all_buses)
429 pcibios_make_OF_bus_map();
431 /* Call common code to handle resource allocation */
432 pcibios_resource_survey();
434 /* Call machine dependent post-init code */
435 if (ppc_md.pcibios_after_init)
436 ppc_md.pcibios_after_init();
441 subsys_initcall(pcibios_init);
443 /* the next one is stolen from the alpha port... */
445 pcibios_update_irq(struct pci_dev *dev, int irq)
447 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
448 /* XXX FIXME - update OF device tree node interrupt property */
451 static struct pci_controller*
452 pci_bus_to_hose(int bus)
454 struct pci_controller *hose, *tmp;
456 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
457 if (bus >= hose->first_busno && bus <= hose->last_busno)
462 /* Provide information on locations of various I/O regions in physical
463 * memory. Do this on a per-card basis so that we choose the right
465 * Note that the returned IO or memory base is a physical address
468 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
470 struct pci_controller* hose;
471 long result = -EOPNOTSUPP;
473 hose = pci_bus_to_hose(bus);
478 case IOBASE_BRIDGE_NUMBER:
479 return (long)hose->first_busno;
481 return (long)hose->pci_mem_offset;
483 return (long)hose->io_base_phys;
485 return (long)isa_io_base;
487 return (long)isa_mem_base;
494 * Null PCI config access functions, for the case when we can't
497 #define NULL_PCI_OP(rw, size, type) \
499 null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \
501 return PCIBIOS_DEVICE_NOT_FOUND; \
505 null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
508 return PCIBIOS_DEVICE_NOT_FOUND;
512 null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
515 return PCIBIOS_DEVICE_NOT_FOUND;
518 static struct pci_ops null_pci_ops =
520 .read = null_read_config,
521 .write = null_write_config,
525 * These functions are used early on before PCI scanning is done
526 * and all of the pci_dev and pci_bus structures have been created.
528 static struct pci_bus *
529 fake_pci_bus(struct pci_controller *hose, int busnr)
531 static struct pci_bus bus;
534 hose = pci_bus_to_hose(busnr);
536 printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
540 bus.ops = hose? hose->ops: &null_pci_ops;
544 #define EARLY_PCI_OP(rw, size, type) \
545 int early_##rw##_config_##size(struct pci_controller *hose, int bus, \
546 int devfn, int offset, type value) \
548 return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \
549 devfn, offset, value); \
552 EARLY_PCI_OP(read, byte, u8 *)
553 EARLY_PCI_OP(read, word, u16 *)
554 EARLY_PCI_OP(read, dword, u32 *)
555 EARLY_PCI_OP(write, byte, u8)
556 EARLY_PCI_OP(write, word, u16)
557 EARLY_PCI_OP(write, dword, u32)
559 extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int cap);
560 int early_find_capability(struct pci_controller *hose, int bus, int devfn,
563 return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);