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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> | |
1da177e4 LT |
32 | #include <linux/init.h> |
33 | #include <asm/eeh.h> /* for eeh_add_device() */ | |
34 | #include <asm/rtas.h> /* rtas_call */ | |
35 | #include <asm/pci-bridge.h> /* for pci_controller */ | |
36 | #include "../pci.h" /* for pci_add_new_bus */ | |
37 | /* and pci_do_scan_bus */ | |
38 | #include "rpaphp.h" | |
1da177e4 | 39 | |
5d9bc1fa | 40 | int rpaphp_debug; |
1da177e4 | 41 | LIST_HEAD(rpaphp_slot_head); |
1da177e4 LT |
42 | |
43 | #define DRIVER_VERSION "0.1" | |
44 | #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>" | |
45 | #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver" | |
46 | ||
47 | #define MAX_LOC_CODE 128 | |
48 | ||
49 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
50 | MODULE_DESCRIPTION(DRIVER_DESC); | |
51 | MODULE_LICENSE("GPL"); | |
52 | ||
5d9bc1fa | 53 | module_param_named(debug, rpaphp_debug, bool, 0644); |
1da177e4 | 54 | |
1da177e4 LT |
55 | /** |
56 | * set_attention_status - set attention LED | |
26e6c66e RD |
57 | * @hotplug_slot: target &hotplug_slot |
58 | * @value: LED control value | |
59 | * | |
1da177e4 LT |
60 | * echo 0 > attention -- set LED OFF |
61 | * echo 1 > attention -- set LED ON | |
62 | * echo 2 > attention -- set LED ID(identify, light is blinking) | |
1da177e4 LT |
63 | */ |
64 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value) | |
65 | { | |
c02929c2 | 66 | int rc; |
1da177e4 LT |
67 | struct slot *slot = (struct slot *)hotplug_slot->private; |
68 | ||
1da177e4 LT |
69 | switch (value) { |
70 | case 0: | |
1da177e4 | 71 | case 1: |
1da177e4 | 72 | case 2: |
c02929c2 LV |
73 | break; |
74 | default: | |
75 | value = 1; | |
1da177e4 LT |
76 | break; |
77 | } | |
c02929c2 LV |
78 | |
79 | rc = rtas_set_indicator(DR_INDICATOR, slot->index, value); | |
80 | if (!rc) | |
81 | hotplug_slot->info->attention_status = value; | |
82 | ||
83 | return rc; | |
1da177e4 LT |
84 | } |
85 | ||
86 | /** | |
87 | * get_power_status - get power status of a slot | |
88 | * @hotplug_slot: slot to get status | |
89 | * @value: pointer to store status | |
1da177e4 LT |
90 | */ |
91 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
92 | { | |
427310ff | 93 | int retval, level; |
1da177e4 LT |
94 | struct slot *slot = (struct slot *)hotplug_slot->private; |
95 | ||
427310ff LV |
96 | retval = rtas_get_power_level (slot->power_domain, &level); |
97 | if (!retval) | |
98 | *value = level; | |
1da177e4 LT |
99 | return retval; |
100 | } | |
101 | ||
102 | /** | |
103 | * get_attention_status - get attention LED status | |
26e6c66e RD |
104 | * @hotplug_slot: slot to get status |
105 | * @value: pointer to store status | |
1da177e4 LT |
106 | */ |
107 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
108 | { | |
1da177e4 | 109 | struct slot *slot = (struct slot *)hotplug_slot->private; |
ebf42c0e LV |
110 | *value = slot->hotplug_slot->info->attention_status; |
111 | return 0; | |
1da177e4 LT |
112 | } |
113 | ||
114 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
115 | { | |
116 | struct slot *slot = (struct slot *)hotplug_slot->private; | |
bf0af511 | 117 | int rc, state; |
1da177e4 | 118 | |
bf0af511 | 119 | rc = rpaphp_get_sensor_state(slot, &state); |
bf0af511 LV |
120 | |
121 | *value = NOT_VALID; | |
122 | if (rc) | |
123 | return rc; | |
124 | ||
125 | if (state == EMPTY) | |
126 | *value = EMPTY; | |
127 | else if (state == PRESENT) | |
128 | *value = slot->state; | |
129 | ||
130 | return 0; | |
1da177e4 LT |
131 | } |
132 | ||
133 | static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) | |
134 | { | |
135 | struct slot *slot = (struct slot *)hotplug_slot->private; | |
136 | ||
1da177e4 LT |
137 | switch (slot->type) { |
138 | case 1: | |
139 | case 2: | |
140 | case 3: | |
141 | case 4: | |
142 | case 5: | |
143 | case 6: | |
144 | *value = PCI_SPEED_33MHz; /* speed for case 1-6 */ | |
145 | break; | |
146 | case 7: | |
147 | case 8: | |
148 | *value = PCI_SPEED_66MHz; | |
149 | break; | |
150 | case 11: | |
151 | case 14: | |
152 | *value = PCI_SPEED_66MHz_PCIX; | |
153 | break; | |
154 | case 12: | |
155 | case 15: | |
156 | *value = PCI_SPEED_100MHz_PCIX; | |
157 | break; | |
158 | case 13: | |
159 | case 16: | |
160 | *value = PCI_SPEED_133MHz_PCIX; | |
161 | break; | |
162 | default: | |
163 | *value = PCI_SPEED_UNKNOWN; | |
164 | break; | |
165 | ||
166 | } | |
1da177e4 LT |
167 | return 0; |
168 | } | |
169 | ||
954a46e2 JK |
170 | static int get_children_props(struct device_node *dn, const int **drc_indexes, |
171 | const int **drc_names, const int **drc_types, | |
172 | const int **drc_power_domains) | |
1da177e4 | 173 | { |
954a46e2 | 174 | const int *indexes, *names, *types, *domains; |
1da177e4 | 175 | |
40cd3a45 SR |
176 | indexes = of_get_property(dn, "ibm,drc-indexes", NULL); |
177 | names = of_get_property(dn, "ibm,drc-names", NULL); | |
178 | types = of_get_property(dn, "ibm,drc-types", NULL); | |
179 | domains = of_get_property(dn, "ibm,drc-power-domains", NULL); | |
1da177e4 LT |
180 | |
181 | if (!indexes || !names || !types || !domains) { | |
182 | /* Slot does not have dynamically-removable children */ | |
183 | return -EINVAL; | |
184 | } | |
185 | if (drc_indexes) | |
186 | *drc_indexes = indexes; | |
187 | if (drc_names) | |
188 | /* &drc_names[1] contains NULL terminated slot names */ | |
189 | *drc_names = names; | |
190 | if (drc_types) | |
191 | /* &drc_types[1] contains NULL terminated slot types */ | |
192 | *drc_types = types; | |
193 | if (drc_power_domains) | |
194 | *drc_power_domains = domains; | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | /* To get the DRC props describing the current node, first obtain it's | |
200 | * my-drc-index property. Next obtain the DRC list from it's parent. Use | |
201 | * the my-drc-index for correlation, and obtain the requested properties. | |
202 | */ | |
203 | int rpaphp_get_drc_props(struct device_node *dn, int *drc_index, | |
204 | char **drc_name, char **drc_type, int *drc_power_domain) | |
205 | { | |
954a46e2 JK |
206 | const int *indexes, *names; |
207 | const int *types, *domains; | |
208 | const unsigned int *my_index; | |
1da177e4 LT |
209 | char *name_tmp, *type_tmp; |
210 | int i, rc; | |
211 | ||
40cd3a45 | 212 | my_index = of_get_property(dn, "ibm,my-drc-index", NULL); |
1da177e4 LT |
213 | if (!my_index) { |
214 | /* Node isn't DLPAR/hotplug capable */ | |
215 | return -EINVAL; | |
216 | } | |
217 | ||
218 | rc = get_children_props(dn->parent, &indexes, &names, &types, &domains); | |
219 | if (rc < 0) { | |
220 | return -EINVAL; | |
221 | } | |
222 | ||
223 | name_tmp = (char *) &names[1]; | |
224 | type_tmp = (char *) &types[1]; | |
225 | ||
226 | /* Iterate through parent properties, looking for my-drc-index */ | |
227 | for (i = 0; i < indexes[0]; i++) { | |
228 | if ((unsigned int) indexes[i + 1] == *my_index) { | |
229 | if (drc_name) | |
230 | *drc_name = name_tmp; | |
231 | if (drc_type) | |
232 | *drc_type = type_tmp; | |
233 | if (drc_index) | |
234 | *drc_index = *my_index; | |
235 | if (drc_power_domain) | |
236 | *drc_power_domain = domains[i+1]; | |
237 | return 0; | |
238 | } | |
239 | name_tmp += (strlen(name_tmp) + 1); | |
240 | type_tmp += (strlen(type_tmp) + 1); | |
241 | } | |
242 | ||
243 | return -EINVAL; | |
244 | } | |
245 | ||
246 | static int is_php_type(char *drc_type) | |
247 | { | |
248 | unsigned long value; | |
249 | char *endptr; | |
250 | ||
251 | /* PCI Hotplug nodes have an integer for drc_type */ | |
252 | value = simple_strtoul(drc_type, &endptr, 10); | |
253 | if (endptr == drc_type) | |
254 | return 0; | |
255 | ||
256 | return 1; | |
257 | } | |
258 | ||
da65944b LV |
259 | /** |
260 | * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0 | |
26e6c66e RD |
261 | * @dn: target &device_node |
262 | * @indexes: passed to get_children_props() | |
263 | * @names: passed to get_children_props() | |
264 | * @types: returned from get_children_props() | |
265 | * @power_domains: | |
da65944b LV |
266 | * |
267 | * This routine will return true only if the device node is | |
268 | * a hotpluggable slot. This routine will return false | |
269 | * for built-in pci slots (even when the built-in slots are | |
270 | * dlparable.) | |
271 | */ | |
954a46e2 JK |
272 | static int is_php_dn(struct device_node *dn, const int **indexes, |
273 | const int **names, const int **types, const int **power_domains) | |
1da177e4 | 274 | { |
954a46e2 | 275 | const int *drc_types; |
1da177e4 LT |
276 | int rc; |
277 | ||
278 | rc = get_children_props(dn, indexes, names, &drc_types, power_domains); | |
da65944b LV |
279 | if (rc < 0) |
280 | return 0; | |
1da177e4 | 281 | |
da65944b LV |
282 | if (!is_php_type((char *) &drc_types[1])) |
283 | return 0; | |
284 | ||
285 | *types = drc_types; | |
286 | return 1; | |
1da177e4 LT |
287 | } |
288 | ||
f6afbad8 | 289 | /** |
da65944b | 290 | * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem. |
26e6c66e | 291 | * @dn: device node of slot |
da65944b LV |
292 | * |
293 | * This subroutine will register a hotplugable slot with the | |
294 | * PCI hotplug infrastructure. This routine is typicaly called | |
295 | * during boot time, if the hotplug slots are present at boot time, | |
296 | * or is called later, by the dlpar add code, if the slot is | |
297 | * being dynamically added during runtime. | |
298 | * | |
299 | * If the device node points at an embedded (built-in) slot, this | |
300 | * routine will just return without doing anything, since embedded | |
301 | * slots cannot be hotplugged. | |
f6afbad8 | 302 | * |
26e6c66e | 303 | * To remove a slot, it suffices to call rpaphp_deregister_slot(). |
f6afbad8 | 304 | */ |
1da177e4 LT |
305 | int rpaphp_add_slot(struct device_node *dn) |
306 | { | |
307 | struct slot *slot; | |
308 | int retval = 0; | |
56d8456b | 309 | int i; |
954a46e2 | 310 | const int *indexes, *names, *types, *power_domains; |
1da177e4 LT |
311 | char *name, *type; |
312 | ||
bf8cbae4 LV |
313 | if (!dn->name || strcmp(dn->name, "pci")) |
314 | return 0; | |
315 | ||
da65944b | 316 | /* If this is not a hotplug slot, return without doing anything. */ |
bf8cbae4 LV |
317 | if (!is_php_dn(dn, &indexes, &names, &types, &power_domains)) |
318 | return 0; | |
319 | ||
66bef8c0 | 320 | dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name); |
1da177e4 | 321 | |
1da177e4 | 322 | /* register PCI devices */ |
bf8cbae4 LV |
323 | name = (char *) &names[1]; |
324 | type = (char *) &types[1]; | |
325 | for (i = 0; i < indexes[0]; i++) { | |
326 | ||
327 | slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]); | |
328 | if (!slot) | |
329 | return -ENOMEM; | |
330 | ||
331 | slot->type = simple_strtoul(type, NULL, 10); | |
1da177e4 | 332 | |
bf8cbae4 LV |
333 | dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n", |
334 | indexes[i + 1], name, type); | |
1da177e4 | 335 | |
fea54b8c | 336 | retval = rpaphp_enable_slot(slot); |
6f79eb74 LV |
337 | if (!retval) |
338 | retval = rpaphp_register_slot(slot); | |
339 | ||
31be7586 LV |
340 | if (retval) |
341 | dealloc_slot_struct(slot); | |
342 | ||
bf8cbae4 LV |
343 | name += strlen(name) + 1; |
344 | type += strlen(type) + 1; | |
1da177e4 | 345 | } |
66bef8c0 | 346 | dbg("%s - Exit: rc[%d]\n", __func__, retval); |
31be7586 LV |
347 | |
348 | /* XXX FIXME: reports a failure only if last entry in loop failed */ | |
1da177e4 LT |
349 | return retval; |
350 | } | |
351 | ||
1da177e4 LT |
352 | static void __exit cleanup_slots(void) |
353 | { | |
354 | struct list_head *tmp, *n; | |
355 | struct slot *slot; | |
356 | ||
357 | /* | |
358 | * Unregister all of our slots with the pci_hotplug subsystem, | |
359 | * and free up all memory that we had allocated. | |
360 | * memory will be freed in release_slot callback. | |
361 | */ | |
362 | ||
363 | list_for_each_safe(tmp, n, &rpaphp_slot_head) { | |
364 | slot = list_entry(tmp, struct slot, rpaphp_slot_list); | |
365 | list_del(&slot->rpaphp_slot_list); | |
366 | pci_hp_deregister(slot->hotplug_slot); | |
367 | } | |
368 | return; | |
369 | } | |
370 | ||
371 | static int __init rpaphp_init(void) | |
372 | { | |
5eeb8c63 JR |
373 | struct device_node *dn = NULL; |
374 | ||
1da177e4 | 375 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); |
5eeb8c63 | 376 | |
a57ed79e | 377 | while ((dn = of_find_node_by_name(dn, "pci"))) |
5eeb8c63 JR |
378 | rpaphp_add_slot(dn); |
379 | ||
5eeb8c63 | 380 | return 0; |
1da177e4 LT |
381 | } |
382 | ||
383 | static void __exit rpaphp_exit(void) | |
384 | { | |
385 | cleanup_slots(); | |
386 | } | |
387 | ||
ac1f0e99 | 388 | static int enable_slot(struct hotplug_slot *hotplug_slot) |
1da177e4 | 389 | { |
ac1f0e99 | 390 | struct slot *slot = (struct slot *)hotplug_slot->private; |
e06b80b7 LV |
391 | int state; |
392 | int retval; | |
1da177e4 | 393 | |
e06b80b7 LV |
394 | if (slot->state == CONFIGURED) |
395 | return 0; | |
396 | ||
397 | retval = rpaphp_get_sensor_state(slot, &state); | |
398 | if (retval) | |
399 | return retval; | |
400 | ||
401 | if (state == PRESENT) { | |
402 | pcibios_add_pci_devices(slot->bus); | |
403 | slot->state = CONFIGURED; | |
404 | } else if (state == EMPTY) { | |
405 | slot->state = EMPTY; | |
406 | } else { | |
66bef8c0 | 407 | err("%s: slot[%s] is in invalid state\n", __func__, slot->name); |
e06b80b7 LV |
408 | slot->state = NOT_VALID; |
409 | return -EINVAL; | |
1da177e4 | 410 | } |
e06b80b7 LV |
411 | return 0; |
412 | } | |
413 | ||
ac1f0e99 | 414 | static int disable_slot(struct hotplug_slot *hotplug_slot) |
e06b80b7 | 415 | { |
e06b80b7 | 416 | struct slot *slot = (struct slot *)hotplug_slot->private; |
8fe64399 LV |
417 | if (slot->state == NOT_CONFIGURED) |
418 | return -EINVAL; | |
1da177e4 | 419 | |
e70ea263 | 420 | pcibios_remove_pci_devices(slot->bus); |
8fe64399 LV |
421 | slot->state = NOT_CONFIGURED; |
422 | return 0; | |
423 | } | |
424 | ||
b64a71ab | 425 | struct hotplug_slot_ops rpaphp_hotplug_slot_ops = { |
b64a71ab LV |
426 | .enable_slot = enable_slot, |
427 | .disable_slot = disable_slot, | |
428 | .set_attention_status = set_attention_status, | |
429 | .get_power_status = get_power_status, | |
430 | .get_attention_status = get_attention_status, | |
431 | .get_adapter_status = get_adapter_status, | |
432 | .get_max_bus_speed = get_max_bus_speed, | |
433 | }; | |
434 | ||
1da177e4 LT |
435 | module_init(rpaphp_init); |
436 | module_exit(rpaphp_exit); | |
437 | ||
438 | EXPORT_SYMBOL_GPL(rpaphp_add_slot); | |
1da177e4 LT |
439 | EXPORT_SYMBOL_GPL(rpaphp_slot_head); |
440 | EXPORT_SYMBOL_GPL(rpaphp_get_drc_props); |