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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> | |
4c9d2800 | 20 | #include <linux/pci.h> |
283029d1 | 21 | #include <linux/of.h> |
cd6eed37 SR |
22 | #include <linux/of_device.h> |
23 | #include <linux/of_platform.h> | |
7eebde70 BH |
24 | |
25 | #include <asm/errno.h> | |
12d04eef | 26 | #include <asm/topology.h> |
4c9d2800 BH |
27 | #include <asm/pci-bridge.h> |
28 | #include <asm/ppc-pci.h> | |
9309180f BH |
29 | #include <asm/atomic.h> |
30 | ||
7eebde70 BH |
31 | /* |
32 | * The list of OF IDs below is used for matching bus types in the | |
33 | * system whose devices are to be exposed as of_platform_devices. | |
34 | * | |
35 | * This is the default list valid for most platforms. This file provides | |
36 | * functions who can take an explicit list if necessary though | |
37 | * | |
38 | * The search is always performed recursively looking for children of | |
39 | * the provided device_node and recursively if such a children matches | |
40 | * a bus type in the list | |
41 | */ | |
42 | ||
b91bdd15 | 43 | static const struct of_device_id of_default_bus_ids[] = { |
7eebde70 BH |
44 | { .type = "soc", }, |
45 | { .compatible = "soc", }, | |
46 | { .type = "spider", }, | |
47 | { .type = "axon", }, | |
48 | { .type = "plb5", }, | |
49 | { .type = "plb4", }, | |
50 | { .type = "opb", }, | |
4bc19626 | 51 | { .type = "ebc", }, |
7eebde70 BH |
52 | {}, |
53 | }; | |
54 | ||
7eebde70 | 55 | struct bus_type of_platform_bus_type = { |
1f9209cf | 56 | .uevent = of_device_uevent, |
7eebde70 BH |
57 | }; |
58 | EXPORT_SYMBOL(of_platform_bus_type); | |
59 | ||
60 | static int __init of_bus_driver_init(void) | |
61 | { | |
3f23de10 | 62 | return of_bus_type_init(&of_platform_bus_type, "of_platform"); |
7eebde70 BH |
63 | } |
64 | ||
65 | postcore_initcall(of_bus_driver_init); | |
66 | ||
7eebde70 BH |
67 | struct of_device* of_platform_device_create(struct device_node *np, |
68 | const char *bus_id, | |
69 | struct device *parent) | |
70 | { | |
71 | struct of_device *dev; | |
72 | ||
fec738dd | 73 | dev = of_device_alloc(np, bus_id, parent); |
7eebde70 BH |
74 | if (!dev) |
75 | return NULL; | |
7eebde70 | 76 | |
cb6dc512 | 77 | dev->archdata.dma_mask = 0xffffffffUL; |
284901a9 | 78 | dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
ba0fc709 | 79 | |
7eebde70 | 80 | dev->dev.bus = &of_platform_bus_type; |
12d04eef BH |
81 | |
82 | /* We do not fill the DMA ops for platform devices by default. | |
83 | * This is currently the responsibility of the platform code | |
84 | * to do such, possibly using a device notifier | |
85 | */ | |
7eebde70 | 86 | |
7eebde70 | 87 | if (of_device_register(dev) != 0) { |
fec738dd | 88 | of_device_free(dev); |
7eebde70 BH |
89 | return NULL; |
90 | } | |
91 | ||
92 | return dev; | |
93 | } | |
94 | EXPORT_SYMBOL(of_platform_device_create); | |
95 | ||
96 | ||
97 | ||
98 | /** | |
99 | * of_platform_bus_create - Create an OF device for a bus node and all its | |
100 | * children. Optionally recursively instanciate matching busses. | |
101 | * @bus: device node of the bus to instanciate | |
102 | * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to | |
103 | * disallow recursive creation of child busses | |
104 | */ | |
b91bdd15 SR |
105 | static int of_platform_bus_create(const struct device_node *bus, |
106 | const struct of_device_id *matches, | |
7eebde70 BH |
107 | struct device *parent) |
108 | { | |
109 | struct device_node *child; | |
110 | struct of_device *dev; | |
111 | int rc = 0; | |
112 | ||
85e99b9f | 113 | for_each_child_of_node(bus, child) { |
7eebde70 BH |
114 | pr_debug(" create child: %s\n", child->full_name); |
115 | dev = of_platform_device_create(child, NULL, parent); | |
116 | if (dev == NULL) | |
117 | rc = -ENOMEM; | |
118 | else if (!of_match_node(matches, child)) | |
119 | continue; | |
120 | if (rc == 0) { | |
121 | pr_debug(" and sub busses\n"); | |
122 | rc = of_platform_bus_create(child, matches, &dev->dev); | |
123 | } if (rc) { | |
124 | of_node_put(child); | |
125 | break; | |
126 | } | |
127 | } | |
128 | return rc; | |
129 | } | |
130 | ||
131 | /** | |
132 | * of_platform_bus_probe - Probe the device-tree for platform busses | |
133 | * @root: parent of the first level to probe or NULL for the root of the tree | |
134 | * @matches: match table, NULL to use the default | |
135 | * @parent: parent to hook devices from, NULL for toplevel | |
136 | * | |
137 | * Note that children of the provided root are not instanciated as devices | |
138 | * unless the specified root itself matches the bus list and is not NULL. | |
139 | */ | |
140 | ||
141 | int of_platform_bus_probe(struct device_node *root, | |
b91bdd15 | 142 | const struct of_device_id *matches, |
7eebde70 BH |
143 | struct device *parent) |
144 | { | |
145 | struct device_node *child; | |
146 | struct of_device *dev; | |
147 | int rc = 0; | |
148 | ||
149 | if (matches == NULL) | |
150 | matches = of_default_bus_ids; | |
151 | if (matches == OF_NO_DEEP_PROBE) | |
152 | return -EINVAL; | |
153 | if (root == NULL) | |
154 | root = of_find_node_by_path("/"); | |
155 | else | |
156 | of_node_get(root); | |
157 | ||
158 | pr_debug("of_platform_bus_probe()\n"); | |
159 | pr_debug(" starting at: %s\n", root->full_name); | |
160 | ||
161 | /* Do a self check of bus type, if there's a match, create | |
162 | * children | |
163 | */ | |
164 | if (of_match_node(matches, root)) { | |
165 | pr_debug(" root match, create all sub devices\n"); | |
166 | dev = of_platform_device_create(root, NULL, parent); | |
167 | if (dev == NULL) { | |
168 | rc = -ENOMEM; | |
169 | goto bail; | |
170 | } | |
171 | pr_debug(" create all sub busses\n"); | |
172 | rc = of_platform_bus_create(root, matches, &dev->dev); | |
173 | goto bail; | |
174 | } | |
85e99b9f | 175 | for_each_child_of_node(root, child) { |
7eebde70 BH |
176 | if (!of_match_node(matches, child)) |
177 | continue; | |
178 | ||
179 | pr_debug(" match: %s\n", child->full_name); | |
180 | dev = of_platform_device_create(child, NULL, parent); | |
181 | if (dev == NULL) | |
182 | rc = -ENOMEM; | |
183 | else | |
184 | rc = of_platform_bus_create(child, matches, &dev->dev); | |
185 | if (rc) { | |
186 | of_node_put(child); | |
187 | break; | |
188 | } | |
189 | } | |
190 | bail: | |
191 | of_node_put(root); | |
192 | return rc; | |
193 | } | |
194 | EXPORT_SYMBOL(of_platform_bus_probe); | |
195 | ||
196 | static int of_dev_node_match(struct device *dev, void *data) | |
197 | { | |
61c7a080 | 198 | return to_of_device(dev)->dev.of_node == data; |
7eebde70 BH |
199 | } |
200 | ||
201 | struct of_device *of_find_device_by_node(struct device_node *np) | |
202 | { | |
203 | struct device *dev; | |
204 | ||
205 | dev = bus_find_device(&of_platform_bus_type, | |
206 | NULL, np, of_dev_node_match); | |
207 | if (dev) | |
208 | return to_of_device(dev); | |
209 | return NULL; | |
210 | } | |
211 | EXPORT_SYMBOL(of_find_device_by_node); | |
212 | ||
213 | static int of_dev_phandle_match(struct device *dev, void *data) | |
214 | { | |
215 | phandle *ph = data; | |
61c7a080 | 216 | return to_of_device(dev)->dev.of_node->phandle == *ph; |
7eebde70 BH |
217 | } |
218 | ||
219 | struct of_device *of_find_device_by_phandle(phandle ph) | |
220 | { | |
221 | struct device *dev; | |
222 | ||
223 | dev = bus_find_device(&of_platform_bus_type, | |
224 | NULL, &ph, of_dev_phandle_match); | |
225 | if (dev) | |
226 | return to_of_device(dev); | |
227 | return NULL; | |
228 | } | |
229 | EXPORT_SYMBOL(of_find_device_by_phandle); | |
4c9d2800 BH |
230 | |
231 | ||
232 | #ifdef CONFIG_PPC_OF_PLATFORM_PCI | |
233 | ||
234 | /* The probing of PCI controllers from of_platform is currently | |
235 | * 64 bits only, mostly due to gratuitous differences between | |
236 | * the 32 and 64 bits PCI code on PowerPC and the 32 bits one | |
237 | * lacking some bits needed here. | |
238 | */ | |
239 | ||
240 | static int __devinit of_pci_phb_probe(struct of_device *dev, | |
241 | const struct of_device_id *match) | |
242 | { | |
243 | struct pci_controller *phb; | |
244 | ||
245 | /* Check if we can do that ... */ | |
246 | if (ppc_md.pci_setup_phb == NULL) | |
247 | return -ENODEV; | |
248 | ||
61c7a080 | 249 | pr_info("Setting up PCI bus %s\n", dev->dev.of_node->full_name); |
4c9d2800 BH |
250 | |
251 | /* Alloc and setup PHB data structure */ | |
61c7a080 | 252 | phb = pcibios_alloc_controller(dev->dev.of_node); |
4c9d2800 BH |
253 | if (!phb) |
254 | return -ENODEV; | |
255 | ||
256 | /* Setup parent in sysfs */ | |
257 | phb->parent = &dev->dev; | |
258 | ||
259 | /* Setup the PHB using arch provided callback */ | |
260 | if (ppc_md.pci_setup_phb(phb)) { | |
261 | pcibios_free_controller(phb); | |
262 | return -ENODEV; | |
263 | } | |
264 | ||
265 | /* Process "ranges" property */ | |
61c7a080 | 266 | pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0); |
4c9d2800 | 267 | |
4c9d2800 BH |
268 | /* Init pci_dn data structures */ |
269 | pci_devs_phb_init_dynamic(phb); | |
270 | ||
271 | /* Register devices with EEH */ | |
272 | #ifdef CONFIG_EEH | |
61c7a080 GL |
273 | if (dev->dev.of_node->child) |
274 | eeh_add_device_tree_early(dev->dev.of_node); | |
4c9d2800 BH |
275 | #endif /* CONFIG_EEH */ |
276 | ||
277 | /* Scan the bus */ | |
61c7a080 | 278 | pcibios_scan_phb(phb, dev->dev.of_node); |
7cfb62a2 IK |
279 | if (phb->bus == NULL) |
280 | return -ENXIO; | |
4c9d2800 BH |
281 | |
282 | /* Claim resources. This might need some rework as well depending | |
283 | * wether we are doing probe-only or not, like assigning unassigned | |
284 | * resources etc... | |
285 | */ | |
286 | pcibios_claim_one_bus(phb->bus); | |
287 | ||
288 | /* Finish EEH setup */ | |
289 | #ifdef CONFIG_EEH | |
290 | eeh_add_device_tree_late(phb->bus); | |
291 | #endif | |
292 | ||
293 | /* Add probed PCI devices to the device model */ | |
294 | pci_bus_add_devices(phb->bus); | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | static struct of_device_id of_pci_phb_ids[] = { | |
300 | { .type = "pci", }, | |
301 | { .type = "pcix", }, | |
302 | { .type = "pcie", }, | |
303 | { .type = "pciex", }, | |
304 | { .type = "ht", }, | |
305 | {} | |
306 | }; | |
307 | ||
308 | static struct of_platform_driver of_pci_phb_driver = { | |
cd6eed37 SR |
309 | .match_table = of_pci_phb_ids, |
310 | .probe = of_pci_phb_probe, | |
311 | .driver = { | |
312 | .name = "of-pci", | |
313 | }, | |
4c9d2800 BH |
314 | }; |
315 | ||
316 | static __init int of_pci_phb_init(void) | |
317 | { | |
318 | return of_register_platform_driver(&of_pci_phb_driver); | |
319 | } | |
320 | ||
321 | device_initcall(of_pci_phb_init); | |
322 | ||
323 | #endif /* CONFIG_PPC_OF_PLATFORM_PCI */ |