kvm tools, setup: Create private directory
[linux-2.6/next.git] / arch / powerpc / kernel / pci_32.c
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1 /*
2 * Common pmac/prep/chrp pci routines. -- Cort
3 */
5 #include <linux/kernel.h>
6 #include <linux/pci.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>
16 #include <linux/of.h>
17 #include <linux/slab.h>
19 #include <asm/processor.h>
20 #include <asm/io.h>
21 #include <asm/prom.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>
29 #undef DEBUG
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
41 * some pmacs
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);
53 static void
54 fixup_hide_host_resource_fsl(struct pci_dev *dev)
56 int i, class = dev->class >> 8;
58 if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
59 class == PCI_CLASS_BRIDGE_OTHER) &&
60 (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
61 (dev->bus->parent == NULL)) {
62 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
63 dev->resource[i].start = 0;
64 dev->resource[i].end = 0;
65 dev->resource[i].flags = 0;
69 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);
70 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);
72 static void
73 fixup_cpc710_pci64(struct pci_dev* dev)
75 /* Hide the PCI64 BARs from the kernel as their content doesn't
76 * fit well in the resource management
78 dev->resource[0].start = dev->resource[0].end = 0;
79 dev->resource[0].flags = 0;
80 dev->resource[1].start = dev->resource[1].end = 0;
81 dev->resource[1].flags = 0;
83 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
86 * Functions below are used on OpenFirmware machines.
88 static void
89 make_one_node_map(struct device_node* node, u8 pci_bus)
91 const int *bus_range;
92 int len;
94 if (pci_bus >= pci_bus_count)
95 return;
96 bus_range = of_get_property(node, "bus-range", &len);
97 if (bus_range == NULL || len < 2 * sizeof(int)) {
98 printk(KERN_WARNING "Can't get bus-range for %s, "
99 "assuming it starts at 0\n", node->full_name);
100 pci_to_OF_bus_map[pci_bus] = 0;
101 } else
102 pci_to_OF_bus_map[pci_bus] = bus_range[0];
104 for_each_child_of_node(node, node) {
105 struct pci_dev* dev;
106 const unsigned int *class_code, *reg;
108 class_code = of_get_property(node, "class-code", NULL);
109 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
110 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
111 continue;
112 reg = of_get_property(node, "reg", NULL);
113 if (!reg)
114 continue;
115 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
116 if (!dev || !dev->subordinate) {
117 pci_dev_put(dev);
118 continue;
120 make_one_node_map(node, dev->subordinate->number);
121 pci_dev_put(dev);
125 void
126 pcibios_make_OF_bus_map(void)
128 int i;
129 struct pci_controller *hose, *tmp;
130 struct property *map_prop;
131 struct device_node *dn;
133 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
134 if (!pci_to_OF_bus_map) {
135 printk(KERN_ERR "Can't allocate OF bus map !\n");
136 return;
139 /* We fill the bus map with invalid values, that helps
140 * debugging.
142 for (i=0; i<pci_bus_count; i++)
143 pci_to_OF_bus_map[i] = 0xff;
145 /* For each hose, we begin searching bridges */
146 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
147 struct device_node* node = hose->dn;
149 if (!node)
150 continue;
151 make_one_node_map(node, hose->first_busno);
153 dn = of_find_node_by_path("/");
154 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
155 if (map_prop) {
156 BUG_ON(pci_bus_count > map_prop->length);
157 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
159 of_node_put(dn);
160 #ifdef DEBUG
161 printk("PCI->OF bus map:\n");
162 for (i=0; i<pci_bus_count; i++) {
163 if (pci_to_OF_bus_map[i] == 0xff)
164 continue;
165 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
167 #endif
170 typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);
172 static struct device_node*
173 scan_OF_pci_childs(struct device_node *parent, pci_OF_scan_iterator filter, void* data)
175 struct device_node *node;
176 struct device_node* sub_node;
178 for_each_child_of_node(parent, node) {
179 const unsigned int *class_code;
181 if (filter(node, data)) {
182 of_node_put(node);
183 return node;
186 /* For PCI<->PCI bridges or CardBus bridges, we go down
187 * Note: some OFs create a parent node "multifunc-device" as
188 * a fake root for all functions of a multi-function device,
189 * we go down them as well.
191 class_code = of_get_property(node, "class-code", NULL);
192 if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
193 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
194 strcmp(node->name, "multifunc-device"))
195 continue;
196 sub_node = scan_OF_pci_childs(node, filter, data);
197 if (sub_node) {
198 of_node_put(node);
199 return sub_node;
202 return NULL;
205 static struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
206 unsigned int devfn)
208 struct device_node *np, *cnp;
209 const u32 *reg;
210 unsigned int psize;
212 for_each_child_of_node(parent, np) {
213 reg = of_get_property(np, "reg", &psize);
214 if (reg && psize >= 4 && ((reg[0] >> 8) & 0xff) == devfn)
215 return np;
217 /* Note: some OFs create a parent node "multifunc-device" as
218 * a fake root for all functions of a multi-function device,
219 * we go down them as well. */
220 if (!strcmp(np->name, "multifunc-device")) {
221 cnp = scan_OF_for_pci_dev(np, devfn);
222 if (cnp)
223 return cnp;
226 return NULL;
230 static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
232 struct device_node *parent, *np;
234 /* Are we a root bus ? */
235 if (bus->self == NULL || bus->parent == NULL) {
236 struct pci_controller *hose = pci_bus_to_host(bus);
237 if (hose == NULL)
238 return NULL;
239 return of_node_get(hose->dn);
242 /* not a root bus, we need to get our parent */
243 parent = scan_OF_for_pci_bus(bus->parent);
244 if (parent == NULL)
245 return NULL;
247 /* now iterate for children for a match */
248 np = scan_OF_for_pci_dev(parent, bus->self->devfn);
249 of_node_put(parent);
251 return np;
255 * Scans the OF tree for a device node matching a PCI device
257 struct device_node *
258 pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
260 struct device_node *parent, *np;
262 pr_debug("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
263 parent = scan_OF_for_pci_bus(bus);
264 if (parent == NULL)
265 return NULL;
266 pr_debug(" parent is %s\n", parent ? parent->full_name : "<NULL>");
267 np = scan_OF_for_pci_dev(parent, devfn);
268 of_node_put(parent);
269 pr_debug(" result is %s\n", np ? np->full_name : "<NULL>");
271 /* XXX most callers don't release the returned node
272 * mostly because ppc64 doesn't increase the refcount,
273 * we need to fix that.
275 return np;
277 EXPORT_SYMBOL(pci_busdev_to_OF_node);
279 struct device_node*
280 pci_device_to_OF_node(struct pci_dev *dev)
282 return pci_busdev_to_OF_node(dev->bus, dev->devfn);
284 EXPORT_SYMBOL(pci_device_to_OF_node);
286 static int
287 find_OF_pci_device_filter(struct device_node* node, void* data)
289 return ((void *)node == data);
293 * Returns the PCI device matching a given OF node
296 pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
298 const unsigned int *reg;
299 struct pci_controller* hose;
300 struct pci_dev* dev = NULL;
302 /* Make sure it's really a PCI device */
303 hose = pci_find_hose_for_OF_device(node);
304 if (!hose || !hose->dn)
305 return -ENODEV;
306 if (!scan_OF_pci_childs(hose->dn,
307 find_OF_pci_device_filter, (void *)node))
308 return -ENODEV;
309 reg = of_get_property(node, "reg", NULL);
310 if (!reg)
311 return -ENODEV;
312 *bus = (reg[0] >> 16) & 0xff;
313 *devfn = ((reg[0] >> 8) & 0xff);
315 /* Ok, here we need some tweak. If we have already renumbered
316 * all busses, we can't rely on the OF bus number any more.
317 * the pci_to_OF_bus_map is not enough as several PCI busses
318 * may match the same OF bus number.
320 if (!pci_to_OF_bus_map)
321 return 0;
323 for_each_pci_dev(dev)
324 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
325 dev->devfn == *devfn) {
326 *bus = dev->bus->number;
327 pci_dev_put(dev);
328 return 0;
331 return -ENODEV;
333 EXPORT_SYMBOL(pci_device_from_OF_node);
335 /* We create the "pci-OF-bus-map" property now so it appears in the
336 * /proc device tree
338 void __init
339 pci_create_OF_bus_map(void)
341 struct property* of_prop;
342 struct device_node *dn;
344 of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
345 if (!of_prop)
346 return;
347 dn = of_find_node_by_path("/");
348 if (dn) {
349 memset(of_prop, -1, sizeof(struct property) + 256);
350 of_prop->name = "pci-OF-bus-map";
351 of_prop->length = 256;
352 of_prop->value = &of_prop[1];
353 prom_add_property(dn, of_prop);
354 of_node_put(dn);
358 void __devinit pcibios_setup_phb_io_space(struct pci_controller *hose)
360 unsigned long io_offset;
361 struct resource *res = &hose->io_resource;
363 /* Fixup IO space offset */
364 io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
365 res->start = (res->start + io_offset) & 0xffffffffu;
366 res->end = (res->end + io_offset) & 0xffffffffu;
369 static int __init pcibios_init(void)
371 struct pci_controller *hose, *tmp;
372 int next_busno = 0;
374 printk(KERN_INFO "PCI: Probing PCI hardware\n");
376 if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS)
377 pci_assign_all_buses = 1;
379 /* Scan all of the recorded PCI controllers. */
380 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
381 if (pci_assign_all_buses)
382 hose->first_busno = next_busno;
383 hose->last_busno = 0xff;
384 pcibios_scan_phb(hose);
385 pci_bus_add_devices(hose->bus);
386 if (pci_assign_all_buses || next_busno <= hose->last_busno)
387 next_busno = hose->last_busno + pcibios_assign_bus_offset;
389 pci_bus_count = next_busno;
391 /* OpenFirmware based machines need a map of OF bus
392 * numbers vs. kernel bus numbers since we may have to
393 * remap them.
395 if (pci_assign_all_buses)
396 pcibios_make_OF_bus_map();
398 /* Call common code to handle resource allocation */
399 pcibios_resource_survey();
401 /* Call machine dependent post-init code */
402 if (ppc_md.pcibios_after_init)
403 ppc_md.pcibios_after_init();
405 return 0;
408 subsys_initcall(pcibios_init);
410 static struct pci_controller*
411 pci_bus_to_hose(int bus)
413 struct pci_controller *hose, *tmp;
415 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
416 if (bus >= hose->first_busno && bus <= hose->last_busno)
417 return hose;
418 return NULL;
421 /* Provide information on locations of various I/O regions in physical
422 * memory. Do this on a per-card basis so that we choose the right
423 * root bridge.
424 * Note that the returned IO or memory base is a physical address
427 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
429 struct pci_controller* hose;
430 long result = -EOPNOTSUPP;
432 hose = pci_bus_to_hose(bus);
433 if (!hose)
434 return -ENODEV;
436 switch (which) {
437 case IOBASE_BRIDGE_NUMBER:
438 return (long)hose->first_busno;
439 case IOBASE_MEMORY:
440 return (long)hose->pci_mem_offset;
441 case IOBASE_IO:
442 return (long)hose->io_base_phys;
443 case IOBASE_ISA_IO:
444 return (long)isa_io_base;
445 case IOBASE_ISA_MEM:
446 return (long)isa_mem_base;
449 return result;