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