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>
17 #include <linux/slab.h>
19 #include <asm/processor.h>
22 #include <asm/sections.h>
23 #include <asm/pci-bridge.h>
24 #include <asm/ppc-pci.h>
25 #include <asm/byteorder.h>
26 #include <asm/uaccess.h>
27 #include <asm/machdep.h>
31 unsigned long isa_io_base = 0;
32 unsigned long pci_dram_offset = 0;
33 int pcibios_assign_bus_offset = 1;
35 void pcibios_make_OF_bus_map(void);
37 static void fixup_cpc710_pci64(struct pci_dev* dev);
38 static u8* pci_to_OF_bus_map;
40 /* By default, we don't re-assign bus numbers. We do this only on
43 static int pci_assign_all_buses;
45 static int pci_bus_count;
47 /* This will remain NULL for now, until isa-bridge.c is made common
48 * to both 32-bit and 64-bit.
50 struct pci_dev *isa_bridge_pcidev;
51 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
54 fixup_cpc710_pci64(struct pci_dev* dev)
56 /* Hide the PCI64 BARs from the kernel as their content doesn't
57 * fit well in the resource management
59 dev->resource[0].start = dev->resource[0].end = 0;
60 dev->resource[0].flags = 0;
61 dev->resource[1].start = dev->resource[1].end = 0;
62 dev->resource[1].flags = 0;
64 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
67 * Functions below are used on OpenFirmware machines.
70 make_one_node_map(struct device_node* node, u8 pci_bus)
75 if (pci_bus >= pci_bus_count)
77 bus_range = of_get_property(node, "bus-range", &len);
78 if (bus_range == NULL || len < 2 * sizeof(int)) {
79 printk(KERN_WARNING "Can't get bus-range for %s, "
80 "assuming it starts at 0\n", node->full_name);
81 pci_to_OF_bus_map[pci_bus] = 0;
83 pci_to_OF_bus_map[pci_bus] = bus_range[0];
85 for_each_child_of_node(node, node) {
87 const unsigned int *class_code, *reg;
89 class_code = of_get_property(node, "class-code", NULL);
90 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
91 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
93 reg = of_get_property(node, "reg", NULL);
96 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
97 if (!dev || !dev->subordinate) {
101 make_one_node_map(node, dev->subordinate->number);
107 pcibios_make_OF_bus_map(void)
110 struct pci_controller *hose, *tmp;
111 struct property *map_prop;
112 struct device_node *dn;
114 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
115 if (!pci_to_OF_bus_map) {
116 printk(KERN_ERR "Can't allocate OF bus map !\n");
120 /* We fill the bus map with invalid values, that helps
123 for (i=0; i<pci_bus_count; i++)
124 pci_to_OF_bus_map[i] = 0xff;
126 /* For each hose, we begin searching bridges */
127 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
128 struct device_node* node = hose->dn;
132 make_one_node_map(node, hose->first_busno);
134 dn = of_find_node_by_path("/");
135 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
137 BUG_ON(pci_bus_count > map_prop->length);
138 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
142 printk("PCI->OF bus map:\n");
143 for (i=0; i<pci_bus_count; i++) {
144 if (pci_to_OF_bus_map[i] == 0xff)
146 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
151 typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);
153 static struct device_node*
154 scan_OF_pci_childs(struct device_node *parent, pci_OF_scan_iterator filter, void* data)
156 struct device_node *node;
157 struct device_node* sub_node;
159 for_each_child_of_node(parent, node) {
160 const unsigned int *class_code;
162 if (filter(node, data)) {
167 /* For PCI<->PCI bridges or CardBus bridges, we go down
168 * Note: some OFs create a parent node "multifunc-device" as
169 * a fake root for all functions of a multi-function device,
170 * we go down them as well.
172 class_code = of_get_property(node, "class-code", NULL);
173 if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
174 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
175 strcmp(node->name, "multifunc-device"))
177 sub_node = scan_OF_pci_childs(node, filter, data);
186 static struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
189 struct device_node *np, *cnp;
193 for_each_child_of_node(parent, np) {
194 reg = of_get_property(np, "reg", &psize);
195 if (reg && psize >= 4 && ((reg[0] >> 8) & 0xff) == devfn)
198 /* Note: some OFs create a parent node "multifunc-device" as
199 * a fake root for all functions of a multi-function device,
200 * we go down them as well. */
201 if (!strcmp(np->name, "multifunc-device")) {
202 cnp = scan_OF_for_pci_dev(np, devfn);
211 static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
213 struct device_node *parent, *np;
215 /* Are we a root bus ? */
216 if (bus->self == NULL || bus->parent == NULL) {
217 struct pci_controller *hose = pci_bus_to_host(bus);
220 return of_node_get(hose->dn);
223 /* not a root bus, we need to get our parent */
224 parent = scan_OF_for_pci_bus(bus->parent);
228 /* now iterate for children for a match */
229 np = scan_OF_for_pci_dev(parent, bus->self->devfn);
236 * Scans the OF tree for a device node matching a PCI device
239 pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
241 struct device_node *parent, *np;
243 pr_debug("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
244 parent = scan_OF_for_pci_bus(bus);
247 pr_debug(" parent is %s\n", parent ? parent->full_name : "<NULL>");
248 np = scan_OF_for_pci_dev(parent, devfn);
250 pr_debug(" result is %s\n", np ? np->full_name : "<NULL>");
252 /* XXX most callers don't release the returned node
253 * mostly because ppc64 doesn't increase the refcount,
254 * we need to fix that.
258 EXPORT_SYMBOL(pci_busdev_to_OF_node);
261 pci_device_to_OF_node(struct pci_dev *dev)
263 return pci_busdev_to_OF_node(dev->bus, dev->devfn);
265 EXPORT_SYMBOL(pci_device_to_OF_node);
268 find_OF_pci_device_filter(struct device_node* node, void* data)
270 return ((void *)node == data);
274 * Returns the PCI device matching a given OF node
277 pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
279 const unsigned int *reg;
280 struct pci_controller* hose;
281 struct pci_dev* dev = NULL;
283 /* Make sure it's really a PCI device */
284 hose = pci_find_hose_for_OF_device(node);
285 if (!hose || !hose->dn)
287 if (!scan_OF_pci_childs(hose->dn,
288 find_OF_pci_device_filter, (void *)node))
290 reg = of_get_property(node, "reg", NULL);
293 *bus = (reg[0] >> 16) & 0xff;
294 *devfn = ((reg[0] >> 8) & 0xff);
296 /* Ok, here we need some tweak. If we have already renumbered
297 * all busses, we can't rely on the OF bus number any more.
298 * the pci_to_OF_bus_map is not enough as several PCI busses
299 * may match the same OF bus number.
301 if (!pci_to_OF_bus_map)
304 for_each_pci_dev(dev)
305 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
306 dev->devfn == *devfn) {
307 *bus = dev->bus->number;
314 EXPORT_SYMBOL(pci_device_from_OF_node);
316 /* We create the "pci-OF-bus-map" property now so it appears in the
320 pci_create_OF_bus_map(void)
322 struct property* of_prop;
323 struct device_node *dn;
325 of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
328 dn = of_find_node_by_path("/");
330 memset(of_prop, -1, sizeof(struct property) + 256);
331 of_prop->name = "pci-OF-bus-map";
332 of_prop->length = 256;
333 of_prop->value = &of_prop[1];
334 prom_add_property(dn, of_prop);
339 void __devinit pcibios_setup_phb_io_space(struct pci_controller *hose)
341 unsigned long io_offset;
342 struct resource *res = &hose->io_resource;
344 /* Fixup IO space offset */
345 io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
346 res->start = (res->start + io_offset) & 0xffffffffu;
347 res->end = (res->end + io_offset) & 0xffffffffu;
350 static int __init pcibios_init(void)
352 struct pci_controller *hose, *tmp;
355 printk(KERN_INFO "PCI: Probing PCI hardware\n");
357 if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS)
358 pci_assign_all_buses = 1;
360 /* Scan all of the recorded PCI controllers. */
361 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
362 if (pci_assign_all_buses)
363 hose->first_busno = next_busno;
364 hose->last_busno = 0xff;
365 pcibios_scan_phb(hose);
366 pci_bus_add_devices(hose->bus);
367 if (pci_assign_all_buses || next_busno <= hose->last_busno)
368 next_busno = hose->last_busno + pcibios_assign_bus_offset;
370 pci_bus_count = next_busno;
372 /* OpenFirmware based machines need a map of OF bus
373 * numbers vs. kernel bus numbers since we may have to
376 if (pci_assign_all_buses)
377 pcibios_make_OF_bus_map();
379 /* Call common code to handle resource allocation */
380 pcibios_resource_survey();
382 /* Call machine dependent post-init code */
383 if (ppc_md.pcibios_after_init)
384 ppc_md.pcibios_after_init();
389 subsys_initcall(pcibios_init);
391 static struct pci_controller*
392 pci_bus_to_hose(int bus)
394 struct pci_controller *hose, *tmp;
396 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
397 if (bus >= hose->first_busno && bus <= hose->last_busno)
402 /* Provide information on locations of various I/O regions in physical
403 * memory. Do this on a per-card basis so that we choose the right
405 * Note that the returned IO or memory base is a physical address
408 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
410 struct pci_controller* hose;
411 long result = -EOPNOTSUPP;
413 hose = pci_bus_to_hose(bus);
418 case IOBASE_BRIDGE_NUMBER:
419 return (long)hose->first_busno;
421 return (long)hose->pci_mem_offset;
423 return (long)hose->io_base_phys;
425 return (long)isa_io_base;
427 return (long)isa_mem_base;