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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 | 30 | #include <linux/smp.h> |
1da177e4 LT |
31 | #include <linux/init.h> |
32 | #include <asm/eeh.h> /* for eeh_add_device() */ | |
33 | #include <asm/rtas.h> /* rtas_call */ | |
34 | #include <asm/pci-bridge.h> /* for pci_controller */ | |
35 | #include "../pci.h" /* for pci_add_new_bus */ | |
36 | /* and pci_do_scan_bus */ | |
37 | #include "rpaphp.h" | |
1da177e4 | 38 | |
5d9bc1fa | 39 | int rpaphp_debug; |
1da177e4 | 40 | LIST_HEAD(rpaphp_slot_head); |
1da177e4 LT |
41 | |
42 | #define DRIVER_VERSION "0.1" | |
43 | #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>" | |
44 | #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver" | |
45 | ||
46 | #define MAX_LOC_CODE 128 | |
47 | ||
48 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
49 | MODULE_DESCRIPTION(DRIVER_DESC); | |
50 | MODULE_LICENSE("GPL"); | |
51 | ||
5d9bc1fa | 52 | module_param_named(debug, rpaphp_debug, bool, 0644); |
1da177e4 | 53 | |
1da177e4 LT |
54 | /** |
55 | * set_attention_status - set attention LED | |
26e6c66e RD |
56 | * @hotplug_slot: target &hotplug_slot |
57 | * @value: LED control value | |
58 | * | |
1da177e4 LT |
59 | * echo 0 > attention -- set LED OFF |
60 | * echo 1 > attention -- set LED ON | |
61 | * echo 2 > attention -- set LED ID(identify, light is blinking) | |
1da177e4 LT |
62 | */ |
63 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value) | |
64 | { | |
c02929c2 | 65 | int rc; |
1da177e4 LT |
66 | struct slot *slot = (struct slot *)hotplug_slot->private; |
67 | ||
1da177e4 LT |
68 | switch (value) { |
69 | case 0: | |
1da177e4 | 70 | case 1: |
1da177e4 | 71 | case 2: |
c02929c2 LV |
72 | break; |
73 | default: | |
74 | value = 1; | |
1da177e4 LT |
75 | break; |
76 | } | |
c02929c2 LV |
77 | |
78 | rc = rtas_set_indicator(DR_INDICATOR, slot->index, value); | |
79 | if (!rc) | |
80 | hotplug_slot->info->attention_status = value; | |
81 | ||
82 | return rc; | |
1da177e4 LT |
83 | } |
84 | ||
85 | /** | |
86 | * get_power_status - get power status of a slot | |
87 | * @hotplug_slot: slot to get status | |
88 | * @value: pointer to store status | |
1da177e4 LT |
89 | */ |
90 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
91 | { | |
427310ff | 92 | int retval, level; |
1da177e4 LT |
93 | struct slot *slot = (struct slot *)hotplug_slot->private; |
94 | ||
427310ff LV |
95 | retval = rtas_get_power_level (slot->power_domain, &level); |
96 | if (!retval) | |
97 | *value = level; | |
1da177e4 LT |
98 | return retval; |
99 | } | |
100 | ||
101 | /** | |
102 | * get_attention_status - get attention LED status | |
26e6c66e RD |
103 | * @hotplug_slot: slot to get status |
104 | * @value: pointer to store status | |
1da177e4 LT |
105 | */ |
106 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
107 | { | |
1da177e4 | 108 | struct slot *slot = (struct slot *)hotplug_slot->private; |
ebf42c0e LV |
109 | *value = slot->hotplug_slot->info->attention_status; |
110 | return 0; | |
1da177e4 LT |
111 | } |
112 | ||
113 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
114 | { | |
115 | struct slot *slot = (struct slot *)hotplug_slot->private; | |
bf0af511 | 116 | int rc, state; |
1da177e4 | 117 | |
bf0af511 | 118 | rc = rpaphp_get_sensor_state(slot, &state); |
bf0af511 LV |
119 | |
120 | *value = NOT_VALID; | |
121 | if (rc) | |
122 | return rc; | |
123 | ||
124 | if (state == EMPTY) | |
125 | *value = EMPTY; | |
126 | else if (state == PRESENT) | |
127 | *value = slot->state; | |
128 | ||
129 | return 0; | |
1da177e4 LT |
130 | } |
131 | ||
3749c51a | 132 | static enum pci_bus_speed get_max_bus_speed(struct slot *slot) |
1da177e4 | 133 | { |
3749c51a | 134 | enum pci_bus_speed speed; |
1da177e4 LT |
135 | switch (slot->type) { |
136 | case 1: | |
137 | case 2: | |
138 | case 3: | |
139 | case 4: | |
140 | case 5: | |
141 | case 6: | |
3749c51a | 142 | speed = PCI_SPEED_33MHz; /* speed for case 1-6 */ |
1da177e4 LT |
143 | break; |
144 | case 7: | |
145 | case 8: | |
3749c51a | 146 | speed = PCI_SPEED_66MHz; |
1da177e4 LT |
147 | break; |
148 | case 11: | |
149 | case 14: | |
3749c51a | 150 | speed = PCI_SPEED_66MHz_PCIX; |
1da177e4 LT |
151 | break; |
152 | case 12: | |
153 | case 15: | |
3749c51a | 154 | speed = PCI_SPEED_100MHz_PCIX; |
1da177e4 LT |
155 | break; |
156 | case 13: | |
157 | case 16: | |
3749c51a | 158 | speed = PCI_SPEED_133MHz_PCIX; |
1da177e4 LT |
159 | break; |
160 | default: | |
3749c51a | 161 | speed = PCI_SPEED_UNKNOWN; |
1da177e4 | 162 | break; |
1da177e4 | 163 | } |
3749c51a MW |
164 | |
165 | return speed; | |
1da177e4 LT |
166 | } |
167 | ||
954a46e2 JK |
168 | static int get_children_props(struct device_node *dn, const int **drc_indexes, |
169 | const int **drc_names, const int **drc_types, | |
170 | const int **drc_power_domains) | |
1da177e4 | 171 | { |
954a46e2 | 172 | const int *indexes, *names, *types, *domains; |
1da177e4 | 173 | |
40cd3a45 SR |
174 | indexes = of_get_property(dn, "ibm,drc-indexes", NULL); |
175 | names = of_get_property(dn, "ibm,drc-names", NULL); | |
176 | types = of_get_property(dn, "ibm,drc-types", NULL); | |
177 | domains = of_get_property(dn, "ibm,drc-power-domains", NULL); | |
1da177e4 LT |
178 | |
179 | if (!indexes || !names || !types || !domains) { | |
180 | /* Slot does not have dynamically-removable children */ | |
181 | return -EINVAL; | |
182 | } | |
183 | if (drc_indexes) | |
184 | *drc_indexes = indexes; | |
185 | if (drc_names) | |
186 | /* &drc_names[1] contains NULL terminated slot names */ | |
187 | *drc_names = names; | |
188 | if (drc_types) | |
189 | /* &drc_types[1] contains NULL terminated slot types */ | |
190 | *drc_types = types; | |
191 | if (drc_power_domains) | |
192 | *drc_power_domains = domains; | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | /* To get the DRC props describing the current node, first obtain it's | |
198 | * my-drc-index property. Next obtain the DRC list from it's parent. Use | |
199 | * the my-drc-index for correlation, and obtain the requested properties. | |
200 | */ | |
201 | int rpaphp_get_drc_props(struct device_node *dn, int *drc_index, | |
202 | char **drc_name, char **drc_type, int *drc_power_domain) | |
203 | { | |
954a46e2 JK |
204 | const int *indexes, *names; |
205 | const int *types, *domains; | |
206 | const unsigned int *my_index; | |
1da177e4 LT |
207 | char *name_tmp, *type_tmp; |
208 | int i, rc; | |
209 | ||
40cd3a45 | 210 | my_index = of_get_property(dn, "ibm,my-drc-index", NULL); |
1da177e4 LT |
211 | if (!my_index) { |
212 | /* Node isn't DLPAR/hotplug capable */ | |
213 | return -EINVAL; | |
214 | } | |
215 | ||
216 | rc = get_children_props(dn->parent, &indexes, &names, &types, &domains); | |
217 | if (rc < 0) { | |
218 | return -EINVAL; | |
219 | } | |
220 | ||
221 | name_tmp = (char *) &names[1]; | |
222 | type_tmp = (char *) &types[1]; | |
223 | ||
224 | /* Iterate through parent properties, looking for my-drc-index */ | |
225 | for (i = 0; i < indexes[0]; i++) { | |
226 | if ((unsigned int) indexes[i + 1] == *my_index) { | |
227 | if (drc_name) | |
228 | *drc_name = name_tmp; | |
229 | if (drc_type) | |
230 | *drc_type = type_tmp; | |
231 | if (drc_index) | |
232 | *drc_index = *my_index; | |
233 | if (drc_power_domain) | |
234 | *drc_power_domain = domains[i+1]; | |
235 | return 0; | |
236 | } | |
237 | name_tmp += (strlen(name_tmp) + 1); | |
238 | type_tmp += (strlen(type_tmp) + 1); | |
239 | } | |
240 | ||
241 | return -EINVAL; | |
242 | } | |
243 | ||
244 | static int is_php_type(char *drc_type) | |
245 | { | |
246 | unsigned long value; | |
247 | char *endptr; | |
248 | ||
249 | /* PCI Hotplug nodes have an integer for drc_type */ | |
250 | value = simple_strtoul(drc_type, &endptr, 10); | |
251 | if (endptr == drc_type) | |
252 | return 0; | |
253 | ||
254 | return 1; | |
255 | } | |
256 | ||
da65944b LV |
257 | /** |
258 | * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0 | |
26e6c66e RD |
259 | * @dn: target &device_node |
260 | * @indexes: passed to get_children_props() | |
261 | * @names: passed to get_children_props() | |
262 | * @types: returned from get_children_props() | |
263 | * @power_domains: | |
da65944b LV |
264 | * |
265 | * This routine will return true only if the device node is | |
266 | * a hotpluggable slot. This routine will return false | |
267 | * for built-in pci slots (even when the built-in slots are | |
268 | * dlparable.) | |
269 | */ | |
954a46e2 JK |
270 | static int is_php_dn(struct device_node *dn, const int **indexes, |
271 | const int **names, const int **types, const int **power_domains) | |
1da177e4 | 272 | { |
954a46e2 | 273 | const int *drc_types; |
1da177e4 LT |
274 | int rc; |
275 | ||
276 | rc = get_children_props(dn, indexes, names, &drc_types, power_domains); | |
da65944b LV |
277 | if (rc < 0) |
278 | return 0; | |
1da177e4 | 279 | |
da65944b LV |
280 | if (!is_php_type((char *) &drc_types[1])) |
281 | return 0; | |
282 | ||
283 | *types = drc_types; | |
284 | return 1; | |
1da177e4 LT |
285 | } |
286 | ||
f6afbad8 | 287 | /** |
da65944b | 288 | * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem. |
26e6c66e | 289 | * @dn: device node of slot |
da65944b LV |
290 | * |
291 | * This subroutine will register a hotplugable slot with the | |
292 | * PCI hotplug infrastructure. This routine is typicaly called | |
293 | * during boot time, if the hotplug slots are present at boot time, | |
294 | * or is called later, by the dlpar add code, if the slot is | |
295 | * being dynamically added during runtime. | |
296 | * | |
297 | * If the device node points at an embedded (built-in) slot, this | |
298 | * routine will just return without doing anything, since embedded | |
299 | * slots cannot be hotplugged. | |
f6afbad8 | 300 | * |
26e6c66e | 301 | * To remove a slot, it suffices to call rpaphp_deregister_slot(). |
f6afbad8 | 302 | */ |
1da177e4 LT |
303 | int rpaphp_add_slot(struct device_node *dn) |
304 | { | |
305 | struct slot *slot; | |
306 | int retval = 0; | |
56d8456b | 307 | int i; |
954a46e2 | 308 | const int *indexes, *names, *types, *power_domains; |
1da177e4 LT |
309 | char *name, *type; |
310 | ||
bf8cbae4 LV |
311 | if (!dn->name || strcmp(dn->name, "pci")) |
312 | return 0; | |
313 | ||
da65944b | 314 | /* If this is not a hotplug slot, return without doing anything. */ |
bf8cbae4 LV |
315 | if (!is_php_dn(dn, &indexes, &names, &types, &power_domains)) |
316 | return 0; | |
317 | ||
66bef8c0 | 318 | dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name); |
1da177e4 | 319 | |
1da177e4 | 320 | /* register PCI devices */ |
bf8cbae4 LV |
321 | name = (char *) &names[1]; |
322 | type = (char *) &types[1]; | |
323 | for (i = 0; i < indexes[0]; i++) { | |
324 | ||
325 | slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]); | |
326 | if (!slot) | |
327 | return -ENOMEM; | |
328 | ||
329 | slot->type = simple_strtoul(type, NULL, 10); | |
1da177e4 | 330 | |
bf8cbae4 LV |
331 | dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n", |
332 | indexes[i + 1], name, type); | |
1da177e4 | 333 | |
fea54b8c | 334 | retval = rpaphp_enable_slot(slot); |
6f79eb74 LV |
335 | if (!retval) |
336 | retval = rpaphp_register_slot(slot); | |
337 | ||
31be7586 LV |
338 | if (retval) |
339 | dealloc_slot_struct(slot); | |
340 | ||
bf8cbae4 LV |
341 | name += strlen(name) + 1; |
342 | type += strlen(type) + 1; | |
1da177e4 | 343 | } |
66bef8c0 | 344 | dbg("%s - Exit: rc[%d]\n", __func__, retval); |
31be7586 LV |
345 | |
346 | /* XXX FIXME: reports a failure only if last entry in loop failed */ | |
1da177e4 LT |
347 | return retval; |
348 | } | |
349 | ||
1da177e4 LT |
350 | static void __exit cleanup_slots(void) |
351 | { | |
352 | struct list_head *tmp, *n; | |
353 | struct slot *slot; | |
354 | ||
355 | /* | |
356 | * Unregister all of our slots with the pci_hotplug subsystem, | |
357 | * and free up all memory that we had allocated. | |
358 | * memory will be freed in release_slot callback. | |
359 | */ | |
360 | ||
361 | list_for_each_safe(tmp, n, &rpaphp_slot_head) { | |
362 | slot = list_entry(tmp, struct slot, rpaphp_slot_list); | |
363 | list_del(&slot->rpaphp_slot_list); | |
364 | pci_hp_deregister(slot->hotplug_slot); | |
365 | } | |
366 | return; | |
367 | } | |
368 | ||
369 | static int __init rpaphp_init(void) | |
370 | { | |
5eeb8c63 JR |
371 | struct device_node *dn = NULL; |
372 | ||
1da177e4 | 373 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); |
5eeb8c63 | 374 | |
a57ed79e | 375 | while ((dn = of_find_node_by_name(dn, "pci"))) |
5eeb8c63 JR |
376 | rpaphp_add_slot(dn); |
377 | ||
5eeb8c63 | 378 | return 0; |
1da177e4 LT |
379 | } |
380 | ||
381 | static void __exit rpaphp_exit(void) | |
382 | { | |
383 | cleanup_slots(); | |
384 | } | |
385 | ||
ac1f0e99 | 386 | static int enable_slot(struct hotplug_slot *hotplug_slot) |
1da177e4 | 387 | { |
ac1f0e99 | 388 | struct slot *slot = (struct slot *)hotplug_slot->private; |
e06b80b7 | 389 | int state; |
390 | int retval; | |
1da177e4 | 391 | |
e06b80b7 | 392 | if (slot->state == CONFIGURED) |
393 | return 0; | |
394 | ||
395 | retval = rpaphp_get_sensor_state(slot, &state); | |
396 | if (retval) | |
397 | return retval; | |
398 | ||
399 | if (state == PRESENT) { | |
400 | pcibios_add_pci_devices(slot->bus); | |
401 | slot->state = CONFIGURED; | |
402 | } else if (state == EMPTY) { | |
403 | slot->state = EMPTY; | |
404 | } else { | |
66bef8c0 | 405 | err("%s: slot[%s] is in invalid state\n", __func__, slot->name); |
e06b80b7 | 406 | slot->state = NOT_VALID; |
407 | return -EINVAL; | |
1da177e4 | 408 | } |
3749c51a MW |
409 | |
410 | slot->bus->max_bus_speed = get_max_bus_speed(slot); | |
e06b80b7 | 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 | 417 | if (slot->state == NOT_CONFIGURED) |
418 | return -EINVAL; | |
1da177e4 | 419 | |
e70ea263 | 420 | pcibios_remove_pci_devices(slot->bus); |
8fe64399 | 421 | slot->state = NOT_CONFIGURED; |
422 | return 0; | |
423 | } | |
424 | ||
b64a71ab | 425 | struct hotplug_slot_ops rpaphp_hotplug_slot_ops = { |
b64a71ab | 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, | |
b64a71ab | 432 | }; |
433 | ||
1da177e4 LT |
434 | module_init(rpaphp_init); |
435 | module_exit(rpaphp_exit); | |
436 | ||
437 | EXPORT_SYMBOL_GPL(rpaphp_add_slot); | |
1da177e4 LT |
438 | EXPORT_SYMBOL_GPL(rpaphp_slot_head); |
439 | EXPORT_SYMBOL_GPL(rpaphp_get_drc_props); |