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1da177e4 LT |
1 | /* |
2 | * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. | |
3 | * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> | |
4 | * | |
5 | * All rights reserved. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or (at | |
10 | * your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
15 | * NON INFRINGEMENT. See the GNU General Public License for more | |
16 | * details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | * | |
22 | * Send feedback to <lxie@us.ibm.com> | |
23 | * | |
24 | */ | |
1da177e4 LT |
25 | #include <linux/kernel.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/moduleparam.h> | |
28 | #include <linux/pci.h> | |
7a54f25c | 29 | #include <linux/pci_hotplug.h> |
1da177e4 LT |
30 | #include <linux/slab.h> |
31 | #include <linux/smp.h> | |
32 | #include <linux/smp_lock.h> | |
33 | #include <linux/init.h> | |
34 | #include <asm/eeh.h> /* for eeh_add_device() */ | |
35 | #include <asm/rtas.h> /* rtas_call */ | |
36 | #include <asm/pci-bridge.h> /* for pci_controller */ | |
37 | #include "../pci.h" /* for pci_add_new_bus */ | |
38 | /* and pci_do_scan_bus */ | |
39 | #include "rpaphp.h" | |
1da177e4 LT |
40 | |
41 | int debug; | |
42 | static struct semaphore rpaphp_sem; | |
43 | LIST_HEAD(rpaphp_slot_head); | |
1da177e4 LT |
44 | |
45 | #define DRIVER_VERSION "0.1" | |
46 | #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>" | |
47 | #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver" | |
48 | ||
49 | #define MAX_LOC_CODE 128 | |
50 | ||
51 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
52 | MODULE_DESCRIPTION(DRIVER_DESC); | |
53 | MODULE_LICENSE("GPL"); | |
54 | ||
55 | module_param(debug, bool, 0644); | |
56 | ||
1da177e4 LT |
57 | static int rpaphp_get_attention_status(struct slot *slot) |
58 | { | |
59 | return slot->hotplug_slot->info->attention_status; | |
60 | } | |
61 | ||
62 | /** | |
63 | * set_attention_status - set attention LED | |
64 | * echo 0 > attention -- set LED OFF | |
65 | * echo 1 > attention -- set LED ON | |
66 | * echo 2 > attention -- set LED ID(identify, light is blinking) | |
67 | * | |
68 | */ | |
69 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value) | |
70 | { | |
71 | int retval = 0; | |
72 | struct slot *slot = (struct slot *)hotplug_slot->private; | |
73 | ||
74 | down(&rpaphp_sem); | |
75 | switch (value) { | |
76 | case 0: | |
77 | retval = rpaphp_set_attention_status(slot, LED_OFF); | |
78 | hotplug_slot->info->attention_status = 0; | |
79 | break; | |
80 | case 1: | |
81 | default: | |
82 | retval = rpaphp_set_attention_status(slot, LED_ON); | |
83 | hotplug_slot->info->attention_status = 1; | |
84 | break; | |
85 | case 2: | |
86 | retval = rpaphp_set_attention_status(slot, LED_ID); | |
87 | hotplug_slot->info->attention_status = 2; | |
88 | break; | |
89 | } | |
90 | up(&rpaphp_sem); | |
91 | return retval; | |
92 | } | |
93 | ||
94 | /** | |
95 | * get_power_status - get power status of a slot | |
96 | * @hotplug_slot: slot to get status | |
97 | * @value: pointer to store status | |
98 | * | |
99 | * | |
100 | */ | |
101 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
102 | { | |
427310ff | 103 | int retval, level; |
1da177e4 LT |
104 | struct slot *slot = (struct slot *)hotplug_slot->private; |
105 | ||
106 | down(&rpaphp_sem); | |
427310ff LV |
107 | retval = rtas_get_power_level (slot->power_domain, &level); |
108 | if (!retval) | |
109 | *value = level; | |
1da177e4 LT |
110 | up(&rpaphp_sem); |
111 | return retval; | |
112 | } | |
113 | ||
114 | /** | |
115 | * get_attention_status - get attention LED status | |
116 | * | |
117 | * | |
118 | */ | |
119 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
120 | { | |
121 | int retval = 0; | |
122 | struct slot *slot = (struct slot *)hotplug_slot->private; | |
123 | ||
124 | down(&rpaphp_sem); | |
125 | *value = rpaphp_get_attention_status(slot); | |
126 | up(&rpaphp_sem); | |
127 | return retval; | |
128 | } | |
129 | ||
130 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
131 | { | |
132 | struct slot *slot = (struct slot *)hotplug_slot->private; | |
133 | int retval = 0; | |
134 | ||
135 | down(&rpaphp_sem); | |
5eeb8c63 | 136 | retval = rpaphp_get_pci_adapter_status(slot, 0, value); |
1da177e4 LT |
137 | up(&rpaphp_sem); |
138 | return retval; | |
139 | } | |
140 | ||
141 | static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) | |
142 | { | |
143 | struct slot *slot = (struct slot *)hotplug_slot->private; | |
144 | ||
145 | down(&rpaphp_sem); | |
146 | switch (slot->type) { | |
147 | case 1: | |
148 | case 2: | |
149 | case 3: | |
150 | case 4: | |
151 | case 5: | |
152 | case 6: | |
153 | *value = PCI_SPEED_33MHz; /* speed for case 1-6 */ | |
154 | break; | |
155 | case 7: | |
156 | case 8: | |
157 | *value = PCI_SPEED_66MHz; | |
158 | break; | |
159 | case 11: | |
160 | case 14: | |
161 | *value = PCI_SPEED_66MHz_PCIX; | |
162 | break; | |
163 | case 12: | |
164 | case 15: | |
165 | *value = PCI_SPEED_100MHz_PCIX; | |
166 | break; | |
167 | case 13: | |
168 | case 16: | |
169 | *value = PCI_SPEED_133MHz_PCIX; | |
170 | break; | |
171 | default: | |
172 | *value = PCI_SPEED_UNKNOWN; | |
173 | break; | |
174 | ||
175 | } | |
176 | up(&rpaphp_sem); | |
177 | return 0; | |
178 | } | |
179 | ||
954a46e2 JK |
180 | static int get_children_props(struct device_node *dn, const int **drc_indexes, |
181 | const int **drc_names, const int **drc_types, | |
182 | const int **drc_power_domains) | |
1da177e4 | 183 | { |
954a46e2 | 184 | const int *indexes, *names, *types, *domains; |
1da177e4 | 185 | |
954a46e2 JK |
186 | indexes = get_property(dn, "ibm,drc-indexes", NULL); |
187 | names = get_property(dn, "ibm,drc-names", NULL); | |
188 | types = get_property(dn, "ibm,drc-types", NULL); | |
189 | domains = get_property(dn, "ibm,drc-power-domains", NULL); | |
1da177e4 LT |
190 | |
191 | if (!indexes || !names || !types || !domains) { | |
192 | /* Slot does not have dynamically-removable children */ | |
193 | return -EINVAL; | |
194 | } | |
195 | if (drc_indexes) | |
196 | *drc_indexes = indexes; | |
197 | if (drc_names) | |
198 | /* &drc_names[1] contains NULL terminated slot names */ | |
199 | *drc_names = names; | |
200 | if (drc_types) | |
201 | /* &drc_types[1] contains NULL terminated slot types */ | |
202 | *drc_types = types; | |
203 | if (drc_power_domains) | |
204 | *drc_power_domains = domains; | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | /* To get the DRC props describing the current node, first obtain it's | |
210 | * my-drc-index property. Next obtain the DRC list from it's parent. Use | |
211 | * the my-drc-index for correlation, and obtain the requested properties. | |
212 | */ | |
213 | int rpaphp_get_drc_props(struct device_node *dn, int *drc_index, | |
214 | char **drc_name, char **drc_type, int *drc_power_domain) | |
215 | { | |
954a46e2 JK |
216 | const int *indexes, *names; |
217 | const int *types, *domains; | |
218 | const unsigned int *my_index; | |
1da177e4 LT |
219 | char *name_tmp, *type_tmp; |
220 | int i, rc; | |
221 | ||
954a46e2 | 222 | my_index = get_property(dn, "ibm,my-drc-index", NULL); |
1da177e4 LT |
223 | if (!my_index) { |
224 | /* Node isn't DLPAR/hotplug capable */ | |
225 | return -EINVAL; | |
226 | } | |
227 | ||
228 | rc = get_children_props(dn->parent, &indexes, &names, &types, &domains); | |
229 | if (rc < 0) { | |
230 | return -EINVAL; | |
231 | } | |
232 | ||
233 | name_tmp = (char *) &names[1]; | |
234 | type_tmp = (char *) &types[1]; | |
235 | ||
236 | /* Iterate through parent properties, looking for my-drc-index */ | |
237 | for (i = 0; i < indexes[0]; i++) { | |
238 | if ((unsigned int) indexes[i + 1] == *my_index) { | |
239 | if (drc_name) | |
240 | *drc_name = name_tmp; | |
241 | if (drc_type) | |
242 | *drc_type = type_tmp; | |
243 | if (drc_index) | |
244 | *drc_index = *my_index; | |
245 | if (drc_power_domain) | |
246 | *drc_power_domain = domains[i+1]; | |
247 | return 0; | |
248 | } | |
249 | name_tmp += (strlen(name_tmp) + 1); | |
250 | type_tmp += (strlen(type_tmp) + 1); | |
251 | } | |
252 | ||
253 | return -EINVAL; | |
254 | } | |
255 | ||
256 | static int is_php_type(char *drc_type) | |
257 | { | |
258 | unsigned long value; | |
259 | char *endptr; | |
260 | ||
261 | /* PCI Hotplug nodes have an integer for drc_type */ | |
262 | value = simple_strtoul(drc_type, &endptr, 10); | |
263 | if (endptr == drc_type) | |
264 | return 0; | |
265 | ||
266 | return 1; | |
267 | } | |
268 | ||
954a46e2 JK |
269 | static int is_php_dn(struct device_node *dn, const int **indexes, |
270 | const int **names, const int **types, const int **power_domains) | |
1da177e4 | 271 | { |
954a46e2 | 272 | const int *drc_types; |
1da177e4 LT |
273 | int rc; |
274 | ||
275 | rc = get_children_props(dn, indexes, names, &drc_types, power_domains); | |
276 | if (rc >= 0) { | |
277 | if (is_php_type((char *) &drc_types[1])) { | |
278 | *types = drc_types; | |
279 | return 1; | |
280 | } | |
281 | } | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
f6afbad8 | 286 | /** |
287 | * rpaphp_add_slot -- add hotplug or dlpar slot | |
288 | * | |
1da177e4 LT |
289 | * rpaphp not only registers PCI hotplug slots(HOTPLUG), |
290 | * but also logical DR slots(EMBEDDED). | |
291 | * HOTPLUG slot: An adapter can be physically added/removed. | |
292 | * EMBEDDED slot: An adapter can be logically removed/added | |
293 | * from/to a partition with the slot. | |
f6afbad8 | 294 | */ |
1da177e4 LT |
295 | int rpaphp_add_slot(struct device_node *dn) |
296 | { | |
297 | struct slot *slot; | |
298 | int retval = 0; | |
56d8456b | 299 | int i; |
954a46e2 | 300 | const int *indexes, *names, *types, *power_domains; |
1da177e4 LT |
301 | char *name, *type; |
302 | ||
bf8cbae4 LV |
303 | if (!dn->name || strcmp(dn->name, "pci")) |
304 | return 0; | |
305 | ||
306 | if (!is_php_dn(dn, &indexes, &names, &types, &power_domains)) | |
307 | return 0; | |
308 | ||
1da177e4 LT |
309 | dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name); |
310 | ||
1da177e4 | 311 | /* register PCI devices */ |
bf8cbae4 LV |
312 | name = (char *) &names[1]; |
313 | type = (char *) &types[1]; | |
314 | for (i = 0; i < indexes[0]; i++) { | |
315 | ||
316 | slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]); | |
317 | if (!slot) | |
318 | return -ENOMEM; | |
319 | ||
320 | slot->type = simple_strtoul(type, NULL, 10); | |
1da177e4 | 321 | |
bf8cbae4 LV |
322 | dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n", |
323 | indexes[i + 1], name, type); | |
1da177e4 | 324 | |
bf8cbae4 | 325 | retval = rpaphp_register_pci_slot(slot); |
31be7586 LV |
326 | if (retval) |
327 | dealloc_slot_struct(slot); | |
328 | ||
bf8cbae4 LV |
329 | name += strlen(name) + 1; |
330 | type += strlen(type) + 1; | |
1da177e4 | 331 | } |
fa189159 | 332 | dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); |
31be7586 LV |
333 | |
334 | /* XXX FIXME: reports a failure only if last entry in loop failed */ | |
1da177e4 LT |
335 | return retval; |
336 | } | |
337 | ||
1da177e4 LT |
338 | static void __exit cleanup_slots(void) |
339 | { | |
340 | struct list_head *tmp, *n; | |
341 | struct slot *slot; | |
342 | ||
343 | /* | |
344 | * Unregister all of our slots with the pci_hotplug subsystem, | |
345 | * and free up all memory that we had allocated. | |
346 | * memory will be freed in release_slot callback. | |
347 | */ | |
348 | ||
349 | list_for_each_safe(tmp, n, &rpaphp_slot_head) { | |
350 | slot = list_entry(tmp, struct slot, rpaphp_slot_list); | |
351 | list_del(&slot->rpaphp_slot_list); | |
352 | pci_hp_deregister(slot->hotplug_slot); | |
353 | } | |
354 | return; | |
355 | } | |
356 | ||
357 | static int __init rpaphp_init(void) | |
358 | { | |
5eeb8c63 JR |
359 | struct device_node *dn = NULL; |
360 | ||
1da177e4 | 361 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); |
5eeb8c63 JR |
362 | init_MUTEX(&rpaphp_sem); |
363 | ||
a57ed79e | 364 | while ((dn = of_find_node_by_name(dn, "pci"))) |
5eeb8c63 JR |
365 | rpaphp_add_slot(dn); |
366 | ||
5eeb8c63 | 367 | return 0; |
1da177e4 LT |
368 | } |
369 | ||
370 | static void __exit rpaphp_exit(void) | |
371 | { | |
372 | cleanup_slots(); | |
373 | } | |
374 | ||
e06b80b7 | 375 | static int __enable_slot(struct slot *slot) |
1da177e4 | 376 | { |
e06b80b7 | 377 | int state; |
378 | int retval; | |
1da177e4 | 379 | |
e06b80b7 | 380 | if (slot->state == CONFIGURED) |
381 | return 0; | |
382 | ||
383 | retval = rpaphp_get_sensor_state(slot, &state); | |
384 | if (retval) | |
385 | return retval; | |
386 | ||
387 | if (state == PRESENT) { | |
388 | pcibios_add_pci_devices(slot->bus); | |
389 | slot->state = CONFIGURED; | |
390 | } else if (state == EMPTY) { | |
391 | slot->state = EMPTY; | |
392 | } else { | |
393 | err("%s: slot[%s] is in invalid state\n", __FUNCTION__, slot->name); | |
394 | slot->state = NOT_VALID; | |
395 | return -EINVAL; | |
1da177e4 | 396 | } |
e06b80b7 | 397 | return 0; |
398 | } | |
399 | ||
400 | static int enable_slot(struct hotplug_slot *hotplug_slot) | |
401 | { | |
402 | int retval; | |
403 | struct slot *slot = (struct slot *)hotplug_slot->private; | |
1da177e4 | 404 | |
1da177e4 | 405 | down(&rpaphp_sem); |
e06b80b7 | 406 | retval = __enable_slot(slot); |
1da177e4 | 407 | up(&rpaphp_sem); |
e06b80b7 | 408 | |
1da177e4 LT |
409 | return retval; |
410 | } | |
411 | ||
8fe64399 | 412 | static int __disable_slot(struct slot *slot) |
1da177e4 | 413 | { |
8fe64399 | 414 | struct pci_dev *dev, *tmp; |
1da177e4 | 415 | |
8fe64399 | 416 | if (slot->state == NOT_CONFIGURED) |
417 | return -EINVAL; | |
1da177e4 | 418 | |
8fe64399 | 419 | list_for_each_entry_safe(dev, tmp, &slot->bus->devices, bus_list) { |
420 | eeh_remove_bus_device(dev); | |
421 | pci_remove_bus_device(dev); | |
1da177e4 LT |
422 | } |
423 | ||
8fe64399 | 424 | slot->state = NOT_CONFIGURED; |
425 | return 0; | |
426 | } | |
427 | ||
428 | static int disable_slot(struct hotplug_slot *hotplug_slot) | |
429 | { | |
430 | struct slot *slot = (struct slot *)hotplug_slot->private; | |
431 | int retval; | |
432 | ||
1da177e4 | 433 | down(&rpaphp_sem); |
8fe64399 | 434 | retval = __disable_slot (slot); |
1da177e4 | 435 | up(&rpaphp_sem); |
8fe64399 | 436 | |
1da177e4 LT |
437 | return retval; |
438 | } | |
439 | ||
b64a71ab | 440 | struct hotplug_slot_ops rpaphp_hotplug_slot_ops = { |
441 | .owner = THIS_MODULE, | |
442 | .enable_slot = enable_slot, | |
443 | .disable_slot = disable_slot, | |
444 | .set_attention_status = set_attention_status, | |
445 | .get_power_status = get_power_status, | |
446 | .get_attention_status = get_attention_status, | |
447 | .get_adapter_status = get_adapter_status, | |
448 | .get_max_bus_speed = get_max_bus_speed, | |
449 | }; | |
450 | ||
1da177e4 LT |
451 | module_init(rpaphp_init); |
452 | module_exit(rpaphp_exit); | |
453 | ||
454 | EXPORT_SYMBOL_GPL(rpaphp_add_slot); | |
1da177e4 LT |
455 | EXPORT_SYMBOL_GPL(rpaphp_slot_head); |
456 | EXPORT_SYMBOL_GPL(rpaphp_get_drc_props); |