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7eebde70 BH |
1 | /* |
2 | * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. | |
3 | * <benh@kernel.crashing.org> | |
4c9d2800 | 4 | * and Arnd Bergmann, IBM Corp. |
7eebde70 BH |
5 | * |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #undef DEBUG | |
14 | ||
15 | #include <linux/string.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/mod_devicetable.h> | |
20 | #include <linux/slab.h> | |
4c9d2800 | 21 | #include <linux/pci.h> |
283029d1 | 22 | #include <linux/of.h> |
cd6eed37 SR |
23 | #include <linux/of_device.h> |
24 | #include <linux/of_platform.h> | |
7eebde70 BH |
25 | |
26 | #include <asm/errno.h> | |
12d04eef | 27 | #include <asm/topology.h> |
4c9d2800 BH |
28 | #include <asm/pci-bridge.h> |
29 | #include <asm/ppc-pci.h> | |
9309180f BH |
30 | #include <asm/atomic.h> |
31 | ||
7eebde70 BH |
32 | /* |
33 | * The list of OF IDs below is used for matching bus types in the | |
34 | * system whose devices are to be exposed as of_platform_devices. | |
35 | * | |
36 | * This is the default list valid for most platforms. This file provides | |
37 | * functions who can take an explicit list if necessary though | |
38 | * | |
39 | * The search is always performed recursively looking for children of | |
40 | * the provided device_node and recursively if such a children matches | |
41 | * a bus type in the list | |
42 | */ | |
43 | ||
b91bdd15 | 44 | static const struct of_device_id of_default_bus_ids[] = { |
7eebde70 BH |
45 | { .type = "soc", }, |
46 | { .compatible = "soc", }, | |
47 | { .type = "spider", }, | |
48 | { .type = "axon", }, | |
49 | { .type = "plb5", }, | |
50 | { .type = "plb4", }, | |
51 | { .type = "opb", }, | |
4bc19626 | 52 | { .type = "ebc", }, |
7eebde70 BH |
53 | {}, |
54 | }; | |
55 | ||
7eebde70 | 56 | struct bus_type of_platform_bus_type = { |
1f9209cf | 57 | .uevent = of_device_uevent, |
7eebde70 BH |
58 | }; |
59 | EXPORT_SYMBOL(of_platform_bus_type); | |
60 | ||
61 | static int __init of_bus_driver_init(void) | |
62 | { | |
3f23de10 | 63 | return of_bus_type_init(&of_platform_bus_type, "of_platform"); |
7eebde70 BH |
64 | } |
65 | ||
66 | postcore_initcall(of_bus_driver_init); | |
67 | ||
7eebde70 BH |
68 | struct of_device* of_platform_device_create(struct device_node *np, |
69 | const char *bus_id, | |
70 | struct device *parent) | |
71 | { | |
72 | struct of_device *dev; | |
73 | ||
fec738dd | 74 | dev = of_device_alloc(np, bus_id, parent); |
7eebde70 BH |
75 | if (!dev) |
76 | return NULL; | |
7eebde70 | 77 | |
7eebde70 | 78 | dev->dma_mask = 0xffffffffUL; |
7eebde70 | 79 | dev->dev.bus = &of_platform_bus_type; |
12d04eef BH |
80 | |
81 | /* We do not fill the DMA ops for platform devices by default. | |
82 | * This is currently the responsibility of the platform code | |
83 | * to do such, possibly using a device notifier | |
84 | */ | |
7eebde70 | 85 | |
7eebde70 | 86 | if (of_device_register(dev) != 0) { |
fec738dd | 87 | of_device_free(dev); |
7eebde70 BH |
88 | return NULL; |
89 | } | |
90 | ||
91 | return dev; | |
92 | } | |
93 | EXPORT_SYMBOL(of_platform_device_create); | |
94 | ||
95 | ||
96 | ||
97 | /** | |
98 | * of_platform_bus_create - Create an OF device for a bus node and all its | |
99 | * children. Optionally recursively instanciate matching busses. | |
100 | * @bus: device node of the bus to instanciate | |
101 | * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to | |
102 | * disallow recursive creation of child busses | |
103 | */ | |
b91bdd15 SR |
104 | static int of_platform_bus_create(const struct device_node *bus, |
105 | const struct of_device_id *matches, | |
7eebde70 BH |
106 | struct device *parent) |
107 | { | |
108 | struct device_node *child; | |
109 | struct of_device *dev; | |
110 | int rc = 0; | |
111 | ||
85e99b9f | 112 | for_each_child_of_node(bus, child) { |
7eebde70 BH |
113 | pr_debug(" create child: %s\n", child->full_name); |
114 | dev = of_platform_device_create(child, NULL, parent); | |
115 | if (dev == NULL) | |
116 | rc = -ENOMEM; | |
117 | else if (!of_match_node(matches, child)) | |
118 | continue; | |
119 | if (rc == 0) { | |
120 | pr_debug(" and sub busses\n"); | |
121 | rc = of_platform_bus_create(child, matches, &dev->dev); | |
122 | } if (rc) { | |
123 | of_node_put(child); | |
124 | break; | |
125 | } | |
126 | } | |
127 | return rc; | |
128 | } | |
129 | ||
130 | /** | |
131 | * of_platform_bus_probe - Probe the device-tree for platform busses | |
132 | * @root: parent of the first level to probe or NULL for the root of the tree | |
133 | * @matches: match table, NULL to use the default | |
134 | * @parent: parent to hook devices from, NULL for toplevel | |
135 | * | |
136 | * Note that children of the provided root are not instanciated as devices | |
137 | * unless the specified root itself matches the bus list and is not NULL. | |
138 | */ | |
139 | ||
140 | int of_platform_bus_probe(struct device_node *root, | |
b91bdd15 | 141 | const struct of_device_id *matches, |
7eebde70 BH |
142 | struct device *parent) |
143 | { | |
144 | struct device_node *child; | |
145 | struct of_device *dev; | |
146 | int rc = 0; | |
147 | ||
148 | if (matches == NULL) | |
149 | matches = of_default_bus_ids; | |
150 | if (matches == OF_NO_DEEP_PROBE) | |
151 | return -EINVAL; | |
152 | if (root == NULL) | |
153 | root = of_find_node_by_path("/"); | |
154 | else | |
155 | of_node_get(root); | |
156 | ||
157 | pr_debug("of_platform_bus_probe()\n"); | |
158 | pr_debug(" starting at: %s\n", root->full_name); | |
159 | ||
160 | /* Do a self check of bus type, if there's a match, create | |
161 | * children | |
162 | */ | |
163 | if (of_match_node(matches, root)) { | |
164 | pr_debug(" root match, create all sub devices\n"); | |
165 | dev = of_platform_device_create(root, NULL, parent); | |
166 | if (dev == NULL) { | |
167 | rc = -ENOMEM; | |
168 | goto bail; | |
169 | } | |
170 | pr_debug(" create all sub busses\n"); | |
171 | rc = of_platform_bus_create(root, matches, &dev->dev); | |
172 | goto bail; | |
173 | } | |
85e99b9f | 174 | for_each_child_of_node(root, child) { |
7eebde70 BH |
175 | if (!of_match_node(matches, child)) |
176 | continue; | |
177 | ||
178 | pr_debug(" match: %s\n", child->full_name); | |
179 | dev = of_platform_device_create(child, NULL, parent); | |
180 | if (dev == NULL) | |
181 | rc = -ENOMEM; | |
182 | else | |
183 | rc = of_platform_bus_create(child, matches, &dev->dev); | |
184 | if (rc) { | |
185 | of_node_put(child); | |
186 | break; | |
187 | } | |
188 | } | |
189 | bail: | |
190 | of_node_put(root); | |
191 | return rc; | |
192 | } | |
193 | EXPORT_SYMBOL(of_platform_bus_probe); | |
194 | ||
195 | static int of_dev_node_match(struct device *dev, void *data) | |
196 | { | |
197 | return to_of_device(dev)->node == data; | |
198 | } | |
199 | ||
200 | struct of_device *of_find_device_by_node(struct device_node *np) | |
201 | { | |
202 | struct device *dev; | |
203 | ||
204 | dev = bus_find_device(&of_platform_bus_type, | |
205 | NULL, np, of_dev_node_match); | |
206 | if (dev) | |
207 | return to_of_device(dev); | |
208 | return NULL; | |
209 | } | |
210 | EXPORT_SYMBOL(of_find_device_by_node); | |
211 | ||
212 | static int of_dev_phandle_match(struct device *dev, void *data) | |
213 | { | |
214 | phandle *ph = data; | |
215 | return to_of_device(dev)->node->linux_phandle == *ph; | |
216 | } | |
217 | ||
218 | struct of_device *of_find_device_by_phandle(phandle ph) | |
219 | { | |
220 | struct device *dev; | |
221 | ||
222 | dev = bus_find_device(&of_platform_bus_type, | |
223 | NULL, &ph, of_dev_phandle_match); | |
224 | if (dev) | |
225 | return to_of_device(dev); | |
226 | return NULL; | |
227 | } | |
228 | EXPORT_SYMBOL(of_find_device_by_phandle); | |
4c9d2800 BH |
229 | |
230 | ||
231 | #ifdef CONFIG_PPC_OF_PLATFORM_PCI | |
232 | ||
233 | /* The probing of PCI controllers from of_platform is currently | |
234 | * 64 bits only, mostly due to gratuitous differences between | |
235 | * the 32 and 64 bits PCI code on PowerPC and the 32 bits one | |
236 | * lacking some bits needed here. | |
237 | */ | |
238 | ||
239 | static int __devinit of_pci_phb_probe(struct of_device *dev, | |
240 | const struct of_device_id *match) | |
241 | { | |
242 | struct pci_controller *phb; | |
243 | ||
244 | /* Check if we can do that ... */ | |
245 | if (ppc_md.pci_setup_phb == NULL) | |
246 | return -ENODEV; | |
247 | ||
248 | printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name); | |
249 | ||
250 | /* Alloc and setup PHB data structure */ | |
251 | phb = pcibios_alloc_controller(dev->node); | |
252 | if (!phb) | |
253 | return -ENODEV; | |
254 | ||
255 | /* Setup parent in sysfs */ | |
256 | phb->parent = &dev->dev; | |
257 | ||
258 | /* Setup the PHB using arch provided callback */ | |
259 | if (ppc_md.pci_setup_phb(phb)) { | |
260 | pcibios_free_controller(phb); | |
261 | return -ENODEV; | |
262 | } | |
263 | ||
264 | /* Process "ranges" property */ | |
265 | pci_process_bridge_OF_ranges(phb, dev->node, 0); | |
266 | ||
4c9d2800 BH |
267 | /* Init pci_dn data structures */ |
268 | pci_devs_phb_init_dynamic(phb); | |
269 | ||
270 | /* Register devices with EEH */ | |
271 | #ifdef CONFIG_EEH | |
272 | if (dev->node->child) | |
273 | eeh_add_device_tree_early(dev->node); | |
274 | #endif /* CONFIG_EEH */ | |
275 | ||
276 | /* Scan the bus */ | |
277 | scan_phb(phb); | |
278 | ||
279 | /* Claim resources. This might need some rework as well depending | |
280 | * wether we are doing probe-only or not, like assigning unassigned | |
281 | * resources etc... | |
282 | */ | |
283 | pcibios_claim_one_bus(phb->bus); | |
284 | ||
285 | /* Finish EEH setup */ | |
286 | #ifdef CONFIG_EEH | |
287 | eeh_add_device_tree_late(phb->bus); | |
288 | #endif | |
289 | ||
290 | /* Add probed PCI devices to the device model */ | |
291 | pci_bus_add_devices(phb->bus); | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | static struct of_device_id of_pci_phb_ids[] = { | |
297 | { .type = "pci", }, | |
298 | { .type = "pcix", }, | |
299 | { .type = "pcie", }, | |
300 | { .type = "pciex", }, | |
301 | { .type = "ht", }, | |
302 | {} | |
303 | }; | |
304 | ||
305 | static struct of_platform_driver of_pci_phb_driver = { | |
cd6eed37 SR |
306 | .match_table = of_pci_phb_ids, |
307 | .probe = of_pci_phb_probe, | |
308 | .driver = { | |
309 | .name = "of-pci", | |
310 | }, | |
4c9d2800 BH |
311 | }; |
312 | ||
313 | static __init int of_pci_phb_init(void) | |
314 | { | |
315 | return of_register_platform_driver(&of_pci_phb_driver); | |
316 | } | |
317 | ||
318 | device_initcall(of_pci_phb_init); | |
319 | ||
320 | #endif /* CONFIG_PPC_OF_PLATFORM_PCI */ |