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d3afa58c MS |
1 | /* |
2 | * Common pmac/prep/chrp pci routines. -- Cort | |
3 | */ | |
4 | ||
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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
d3afa58c MS |
18 | |
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/byteorder.h> | |
25 | #include <asm/uaccess.h> | |
26 | ||
27 | #undef DEBUG | |
28 | ||
29 | unsigned long isa_io_base; | |
30 | unsigned long pci_dram_offset; | |
31 | int pcibios_assign_bus_offset = 1; | |
32 | ||
33 | static u8 *pci_to_OF_bus_map; | |
34 | ||
35 | /* By default, we don't re-assign bus numbers. We do this only on | |
36 | * some pmacs | |
37 | */ | |
38 | static int pci_assign_all_buses; | |
39 | ||
40 | static int pci_bus_count; | |
41 | ||
42 | /* | |
43 | * Functions below are used on OpenFirmware machines. | |
44 | */ | |
45 | static void | |
46 | make_one_node_map(struct device_node *node, u8 pci_bus) | |
47 | { | |
48 | const int *bus_range; | |
49 | int len; | |
50 | ||
51 | if (pci_bus >= pci_bus_count) | |
52 | return; | |
53 | bus_range = of_get_property(node, "bus-range", &len); | |
54 | if (bus_range == NULL || len < 2 * sizeof(int)) { | |
55 | printk(KERN_WARNING "Can't get bus-range for %s, " | |
56 | "assuming it starts at 0\n", node->full_name); | |
57 | pci_to_OF_bus_map[pci_bus] = 0; | |
58 | } else | |
59 | pci_to_OF_bus_map[pci_bus] = bus_range[0]; | |
60 | ||
61 | for_each_child_of_node(node, node) { | |
62 | struct pci_dev *dev; | |
63 | const unsigned int *class_code, *reg; | |
64 | ||
65 | class_code = of_get_property(node, "class-code", NULL); | |
66 | if (!class_code || | |
67 | ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && | |
68 | (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) | |
69 | continue; | |
70 | reg = of_get_property(node, "reg", NULL); | |
71 | if (!reg) | |
72 | continue; | |
73 | dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff)); | |
74 | if (!dev || !dev->subordinate) { | |
75 | pci_dev_put(dev); | |
76 | continue; | |
77 | } | |
78 | make_one_node_map(node, dev->subordinate->number); | |
79 | pci_dev_put(dev); | |
80 | } | |
81 | } | |
82 | ||
83 | void | |
84 | pcibios_make_OF_bus_map(void) | |
85 | { | |
86 | int i; | |
87 | struct pci_controller *hose, *tmp; | |
88 | struct property *map_prop; | |
89 | struct device_node *dn; | |
90 | ||
91 | pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); | |
92 | if (!pci_to_OF_bus_map) { | |
93 | printk(KERN_ERR "Can't allocate OF bus map !\n"); | |
94 | return; | |
95 | } | |
96 | ||
97 | /* We fill the bus map with invalid values, that helps | |
98 | * debugging. | |
99 | */ | |
100 | for (i = 0; i < pci_bus_count; i++) | |
101 | pci_to_OF_bus_map[i] = 0xff; | |
102 | ||
103 | /* For each hose, we begin searching bridges */ | |
104 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { | |
105 | struct device_node *node = hose->dn; | |
106 | ||
107 | if (!node) | |
108 | continue; | |
109 | make_one_node_map(node, hose->first_busno); | |
110 | } | |
111 | dn = of_find_node_by_path("/"); | |
112 | map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); | |
113 | if (map_prop) { | |
114 | BUG_ON(pci_bus_count > map_prop->length); | |
115 | memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); | |
116 | } | |
117 | of_node_put(dn); | |
118 | #ifdef DEBUG | |
119 | printk(KERN_INFO "PCI->OF bus map:\n"); | |
120 | for (i = 0; i < pci_bus_count; i++) { | |
121 | if (pci_to_OF_bus_map[i] == 0xff) | |
122 | continue; | |
123 | printk(KERN_INFO "%d -> %d\n", i, pci_to_OF_bus_map[i]); | |
124 | } | |
125 | #endif | |
126 | } | |
127 | ||
128 | typedef int (*pci_OF_scan_iterator)(struct device_node *node, void *data); | |
129 | ||
130 | static struct device_node *scan_OF_pci_childs(struct device_node *parent, | |
131 | pci_OF_scan_iterator filter, void *data) | |
132 | { | |
133 | struct device_node *node; | |
134 | struct device_node *sub_node; | |
135 | ||
136 | for_each_child_of_node(parent, node) { | |
137 | const unsigned int *class_code; | |
138 | ||
139 | if (filter(node, data)) { | |
140 | of_node_put(node); | |
141 | return node; | |
142 | } | |
143 | ||
144 | /* For PCI<->PCI bridges or CardBus bridges, we go down | |
145 | * Note: some OFs create a parent node "multifunc-device" as | |
146 | * a fake root for all functions of a multi-function device, | |
147 | * we go down them as well. | |
148 | */ | |
149 | class_code = of_get_property(node, "class-code", NULL); | |
150 | if ((!class_code || | |
151 | ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && | |
152 | (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) && | |
153 | strcmp(node->name, "multifunc-device")) | |
154 | continue; | |
155 | sub_node = scan_OF_pci_childs(node, filter, data); | |
156 | if (sub_node) { | |
157 | of_node_put(node); | |
158 | return sub_node; | |
159 | } | |
160 | } | |
161 | return NULL; | |
162 | } | |
163 | ||
164 | static struct device_node *scan_OF_for_pci_dev(struct device_node *parent, | |
165 | unsigned int devfn) | |
166 | { | |
167 | struct device_node *np, *cnp; | |
168 | const u32 *reg; | |
169 | unsigned int psize; | |
170 | ||
171 | for_each_child_of_node(parent, np) { | |
172 | reg = of_get_property(np, "reg", &psize); | |
173 | if (reg && psize >= 4 && ((reg[0] >> 8) & 0xff) == devfn) | |
174 | return np; | |
175 | ||
176 | /* Note: some OFs create a parent node "multifunc-device" as | |
177 | * a fake root for all functions of a multi-function device, | |
178 | * we go down them as well. */ | |
179 | if (!strcmp(np->name, "multifunc-device")) { | |
180 | cnp = scan_OF_for_pci_dev(np, devfn); | |
181 | if (cnp) | |
182 | return cnp; | |
183 | } | |
184 | } | |
185 | return NULL; | |
186 | } | |
187 | ||
188 | ||
189 | static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus) | |
190 | { | |
191 | struct device_node *parent, *np; | |
192 | ||
193 | /* Are we a root bus ? */ | |
194 | if (bus->self == NULL || bus->parent == NULL) { | |
195 | struct pci_controller *hose = pci_bus_to_host(bus); | |
196 | if (hose == NULL) | |
197 | return NULL; | |
198 | return of_node_get(hose->dn); | |
199 | } | |
200 | ||
201 | /* not a root bus, we need to get our parent */ | |
202 | parent = scan_OF_for_pci_bus(bus->parent); | |
203 | if (parent == NULL) | |
204 | return NULL; | |
205 | ||
206 | /* now iterate for children for a match */ | |
207 | np = scan_OF_for_pci_dev(parent, bus->self->devfn); | |
208 | of_node_put(parent); | |
209 | ||
210 | return np; | |
211 | } | |
212 | ||
d3afa58c MS |
213 | static int |
214 | find_OF_pci_device_filter(struct device_node *node, void *data) | |
215 | { | |
216 | return ((void *)node == data); | |
217 | } | |
218 | ||
219 | /* | |
220 | * Returns the PCI device matching a given OF node | |
221 | */ | |
222 | int | |
223 | pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn) | |
224 | { | |
225 | const unsigned int *reg; | |
226 | struct pci_controller *hose; | |
227 | struct pci_dev *dev = NULL; | |
228 | ||
229 | /* Make sure it's really a PCI device */ | |
230 | hose = pci_find_hose_for_OF_device(node); | |
231 | if (!hose || !hose->dn) | |
232 | return -ENODEV; | |
233 | if (!scan_OF_pci_childs(hose->dn, | |
234 | find_OF_pci_device_filter, (void *)node)) | |
235 | return -ENODEV; | |
236 | reg = of_get_property(node, "reg", NULL); | |
237 | if (!reg) | |
238 | return -ENODEV; | |
239 | *bus = (reg[0] >> 16) & 0xff; | |
240 | *devfn = ((reg[0] >> 8) & 0xff); | |
241 | ||
242 | /* Ok, here we need some tweak. If we have already renumbered | |
243 | * all busses, we can't rely on the OF bus number any more. | |
244 | * the pci_to_OF_bus_map is not enough as several PCI busses | |
245 | * may match the same OF bus number. | |
246 | */ | |
247 | if (!pci_to_OF_bus_map) | |
248 | return 0; | |
249 | ||
250 | for_each_pci_dev(dev) | |
251 | if (pci_to_OF_bus_map[dev->bus->number] == *bus && | |
252 | dev->devfn == *devfn) { | |
253 | *bus = dev->bus->number; | |
254 | pci_dev_put(dev); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | return -ENODEV; | |
259 | } | |
260 | EXPORT_SYMBOL(pci_device_from_OF_node); | |
261 | ||
262 | /* We create the "pci-OF-bus-map" property now so it appears in the | |
263 | * /proc device tree | |
264 | */ | |
265 | void __init | |
266 | pci_create_OF_bus_map(void) | |
267 | { | |
268 | struct property *of_prop; | |
269 | struct device_node *dn; | |
270 | ||
271 | of_prop = (struct property *) alloc_bootmem(sizeof(struct property) + \ | |
272 | 256); | |
273 | if (!of_prop) | |
274 | return; | |
275 | dn = of_find_node_by_path("/"); | |
276 | if (dn) { | |
277 | memset(of_prop, -1, sizeof(struct property) + 256); | |
278 | of_prop->name = "pci-OF-bus-map"; | |
279 | of_prop->length = 256; | |
280 | of_prop->value = &of_prop[1]; | |
281 | prom_add_property(dn, of_prop); | |
282 | of_node_put(dn); | |
283 | } | |
284 | } | |
285 | ||
98d9f30c BH |
286 | struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) |
287 | { | |
288 | struct pci_controller *hose = bus->sysdata; | |
289 | ||
290 | return of_node_get(hose->dn); | |
291 | } | |
292 | ||
d3afa58c MS |
293 | static void __devinit pcibios_scan_phb(struct pci_controller *hose) |
294 | { | |
295 | struct pci_bus *bus; | |
296 | struct device_node *node = hose->dn; | |
297 | unsigned long io_offset; | |
298 | struct resource *res = &hose->io_resource; | |
299 | ||
300 | pr_debug("PCI: Scanning PHB %s\n", | |
301 | node ? node->full_name : "<NO NAME>"); | |
302 | ||
303 | /* Create an empty bus for the toplevel */ | |
304 | bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose); | |
305 | if (bus == NULL) { | |
306 | printk(KERN_ERR "Failed to create bus for PCI domain %04x\n", | |
307 | hose->global_number); | |
308 | return; | |
309 | } | |
310 | bus->secondary = hose->first_busno; | |
311 | hose->bus = bus; | |
312 | ||
313 | /* Fixup IO space offset */ | |
314 | io_offset = (unsigned long)hose->io_base_virt - isa_io_base; | |
315 | res->start = (res->start + io_offset) & 0xffffffffu; | |
316 | res->end = (res->end + io_offset) & 0xffffffffu; | |
317 | ||
318 | /* Wire up PHB bus resources */ | |
319 | pcibios_setup_phb_resources(hose); | |
320 | ||
321 | /* Scan children */ | |
322 | hose->last_busno = bus->subordinate = pci_scan_child_bus(bus); | |
323 | } | |
324 | ||
325 | static int __init pcibios_init(void) | |
326 | { | |
327 | struct pci_controller *hose, *tmp; | |
328 | int next_busno = 0; | |
329 | ||
330 | printk(KERN_INFO "PCI: Probing PCI hardware\n"); | |
331 | ||
332 | if (pci_flags & PCI_REASSIGN_ALL_BUS) { | |
333 | printk(KERN_INFO "setting pci_asign_all_busses\n"); | |
334 | pci_assign_all_buses = 1; | |
335 | } | |
336 | ||
337 | /* Scan all of the recorded PCI controllers. */ | |
338 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { | |
339 | if (pci_assign_all_buses) | |
340 | hose->first_busno = next_busno; | |
341 | hose->last_busno = 0xff; | |
342 | pcibios_scan_phb(hose); | |
343 | printk(KERN_INFO "calling pci_bus_add_devices()\n"); | |
344 | pci_bus_add_devices(hose->bus); | |
345 | if (pci_assign_all_buses || next_busno <= hose->last_busno) | |
346 | next_busno = hose->last_busno + \ | |
347 | pcibios_assign_bus_offset; | |
348 | } | |
349 | pci_bus_count = next_busno; | |
350 | ||
351 | /* OpenFirmware based machines need a map of OF bus | |
352 | * numbers vs. kernel bus numbers since we may have to | |
353 | * remap them. | |
354 | */ | |
355 | if (pci_assign_all_buses) | |
356 | pcibios_make_OF_bus_map(); | |
357 | ||
358 | /* Call common code to handle resource allocation */ | |
359 | pcibios_resource_survey(); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | subsys_initcall(pcibios_init); | |
365 | ||
366 | static struct pci_controller* | |
367 | pci_bus_to_hose(int bus) | |
368 | { | |
369 | struct pci_controller *hose, *tmp; | |
370 | ||
371 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) | |
372 | if (bus >= hose->first_busno && bus <= hose->last_busno) | |
373 | return hose; | |
374 | return NULL; | |
375 | } | |
376 | ||
377 | /* Provide information on locations of various I/O regions in physical | |
378 | * memory. Do this on a per-card basis so that we choose the right | |
379 | * root bridge. | |
380 | * Note that the returned IO or memory base is a physical address | |
381 | */ | |
382 | ||
383 | long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) | |
384 | { | |
385 | struct pci_controller *hose; | |
386 | long result = -EOPNOTSUPP; | |
387 | ||
388 | hose = pci_bus_to_hose(bus); | |
389 | if (!hose) | |
390 | return -ENODEV; | |
391 | ||
392 | switch (which) { | |
393 | case IOBASE_BRIDGE_NUMBER: | |
394 | return (long)hose->first_busno; | |
395 | case IOBASE_MEMORY: | |
396 | return (long)hose->pci_mem_offset; | |
397 | case IOBASE_IO: | |
398 | return (long)hose->io_base_phys; | |
399 | case IOBASE_ISA_IO: | |
400 | return (long)isa_io_base; | |
401 | case IOBASE_ISA_MEM: | |
402 | return (long)isa_mem_base; | |
403 | } | |
404 | ||
405 | return result; | |
406 | } |