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 */
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/moduleparam.h>
28 #include <linux/pci.h>
29 #include <linux/pci_hotplug.h>
30 #include <linux/smp.h>
31 #include <linux/init.h>
32 #include <linux/vmalloc.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"
39
40 bool rpaphp_debug;
41 LIST_HEAD(rpaphp_slot_head);
42 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
43
44 #define DRIVER_VERSION "0.1"
45 #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
46 #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"
47
48 #define MAX_LOC_CODE 128
49
50 MODULE_AUTHOR(DRIVER_AUTHOR);
51 MODULE_DESCRIPTION(DRIVER_DESC);
52 MODULE_LICENSE("GPL");
53
54 module_param_named(debug, rpaphp_debug, bool, 0644);
55
56 /**
57 * set_attention_status - set attention LED
58 * @hotplug_slot: target &hotplug_slot
59 * @value: LED control value
60 *
61 * echo 0 > attention -- set LED OFF
62 * echo 1 > attention -- set LED ON
63 * echo 2 > attention -- set LED ID(identify, light is blinking)
64 */
set_attention_status(struct hotplug_slot * hotplug_slot,u8 value)65 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
66 {
67 int rc;
68 struct slot *slot = (struct slot *)hotplug_slot->private;
69
70 switch (value) {
71 case 0:
72 case 1:
73 case 2:
74 break;
75 default:
76 value = 1;
77 break;
78 }
79
80 rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
81 if (!rc)
82 hotplug_slot->info->attention_status = value;
83
84 return rc;
85 }
86
87 /**
88 * get_power_status - get power status of a slot
89 * @hotplug_slot: slot to get status
90 * @value: pointer to store status
91 */
get_power_status(struct hotplug_slot * hotplug_slot,u8 * value)92 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
93 {
94 int retval, level;
95 struct slot *slot = (struct slot *)hotplug_slot->private;
96
97 retval = rtas_get_power_level(slot->power_domain, &level);
98 if (!retval)
99 *value = level;
100 return retval;
101 }
102
103 /**
104 * get_attention_status - get attention LED status
105 * @hotplug_slot: slot to get status
106 * @value: pointer to store status
107 */
get_attention_status(struct hotplug_slot * hotplug_slot,u8 * value)108 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
109 {
110 struct slot *slot = (struct slot *)hotplug_slot->private;
111 *value = slot->hotplug_slot->info->attention_status;
112 return 0;
113 }
114
get_adapter_status(struct hotplug_slot * hotplug_slot,u8 * value)115 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
116 {
117 struct slot *slot = (struct slot *)hotplug_slot->private;
118 int rc, state;
119
120 rc = rpaphp_get_sensor_state(slot, &state);
121
122 *value = NOT_VALID;
123 if (rc)
124 return rc;
125
126 if (state == EMPTY)
127 *value = EMPTY;
128 else if (state == PRESENT)
129 *value = slot->state;
130
131 return 0;
132 }
133
get_max_bus_speed(struct slot * slot)134 static enum pci_bus_speed get_max_bus_speed(struct slot *slot)
135 {
136 enum pci_bus_speed speed;
137 switch (slot->type) {
138 case 1:
139 case 2:
140 case 3:
141 case 4:
142 case 5:
143 case 6:
144 speed = PCI_SPEED_33MHz; /* speed for case 1-6 */
145 break;
146 case 7:
147 case 8:
148 speed = PCI_SPEED_66MHz;
149 break;
150 case 11:
151 case 14:
152 speed = PCI_SPEED_66MHz_PCIX;
153 break;
154 case 12:
155 case 15:
156 speed = PCI_SPEED_100MHz_PCIX;
157 break;
158 case 13:
159 case 16:
160 speed = PCI_SPEED_133MHz_PCIX;
161 break;
162 default:
163 speed = PCI_SPEED_UNKNOWN;
164 break;
165 }
166
167 return speed;
168 }
169
get_children_props(struct device_node * dn,const int ** drc_indexes,const int ** drc_names,const int ** drc_types,const int ** drc_power_domains)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)
173 {
174 const int *indexes, *names, *types, *domains;
175
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);
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 */
rpaphp_get_drc_props(struct device_node * dn,int * drc_index,char ** drc_name,char ** drc_type,int * drc_power_domain)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 {
206 const int *indexes, *names;
207 const int *types, *domains;
208 const unsigned int *my_index;
209 char *name_tmp, *type_tmp;
210 int i, rc;
211
212 my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
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 < be32_to_cpu(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 = be32_to_cpu(*my_index);
235 if (drc_power_domain)
236 *drc_power_domain = be32_to_cpu(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 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
246
is_php_type(char * drc_type)247 static int is_php_type(char *drc_type)
248 {
249 unsigned long value;
250 char *endptr;
251
252 /* PCI Hotplug nodes have an integer for drc_type */
253 value = simple_strtoul(drc_type, &endptr, 10);
254 if (endptr == drc_type)
255 return 0;
256
257 return 1;
258 }
259
260 /**
261 * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
262 * @dn: target &device_node
263 * @indexes: passed to get_children_props()
264 * @names: passed to get_children_props()
265 * @types: returned from get_children_props()
266 * @power_domains:
267 *
268 * This routine will return true only if the device node is
269 * a hotpluggable slot. This routine will return false
270 * for built-in pci slots (even when the built-in slots are
271 * dlparable.)
272 */
is_php_dn(struct device_node * dn,const int ** indexes,const int ** names,const int ** types,const int ** power_domains)273 static int is_php_dn(struct device_node *dn, const int **indexes,
274 const int **names, const int **types, const int **power_domains)
275 {
276 const int *drc_types;
277 int rc;
278
279 rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
280 if (rc < 0)
281 return 0;
282
283 if (!is_php_type((char *) &drc_types[1]))
284 return 0;
285
286 *types = drc_types;
287 return 1;
288 }
289
290 /**
291 * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
292 * @dn: device node of slot
293 *
294 * This subroutine will register a hotpluggable slot with the
295 * PCI hotplug infrastructure. This routine is typically called
296 * during boot time, if the hotplug slots are present at boot time,
297 * or is called later, by the dlpar add code, if the slot is
298 * being dynamically added during runtime.
299 *
300 * If the device node points at an embedded (built-in) slot, this
301 * routine will just return without doing anything, since embedded
302 * slots cannot be hotplugged.
303 *
304 * To remove a slot, it suffices to call rpaphp_deregister_slot().
305 */
rpaphp_add_slot(struct device_node * dn)306 int rpaphp_add_slot(struct device_node *dn)
307 {
308 struct slot *slot;
309 int retval = 0;
310 int i;
311 const int *indexes, *names, *types, *power_domains;
312 char *name, *type;
313
314 if (!dn->name || strcmp(dn->name, "pci"))
315 return 0;
316
317 /* If this is not a hotplug slot, return without doing anything. */
318 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
319 return 0;
320
321 dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);
322
323 /* register PCI devices */
324 name = (char *) &names[1];
325 type = (char *) &types[1];
326 for (i = 0; i < be32_to_cpu(indexes[0]); i++) {
327 int index;
328
329 index = be32_to_cpu(indexes[i + 1]);
330 slot = alloc_slot_struct(dn, index, name,
331 be32_to_cpu(power_domains[i + 1]));
332 if (!slot)
333 return -ENOMEM;
334
335 slot->type = simple_strtoul(type, NULL, 10);
336
337 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
338 index, name, type);
339
340 retval = rpaphp_enable_slot(slot);
341 if (!retval)
342 retval = rpaphp_register_slot(slot);
343
344 if (retval)
345 dealloc_slot_struct(slot);
346
347 name += strlen(name) + 1;
348 type += strlen(type) + 1;
349 }
350 dbg("%s - Exit: rc[%d]\n", __func__, retval);
351
352 /* XXX FIXME: reports a failure only if last entry in loop failed */
353 return retval;
354 }
355 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
356
cleanup_slots(void)357 static void __exit cleanup_slots(void)
358 {
359 struct slot *slot, *next;
360
361 /*
362 * Unregister all of our slots with the pci_hotplug subsystem,
363 * and free up all memory that we had allocated.
364 * memory will be freed in release_slot callback.
365 */
366
367 list_for_each_entry_safe(slot, next, &rpaphp_slot_head,
368 rpaphp_slot_list) {
369 list_del(&slot->rpaphp_slot_list);
370 pci_hp_deregister(slot->hotplug_slot);
371 }
372 return;
373 }
374
rpaphp_init(void)375 static int __init rpaphp_init(void)
376 {
377 struct device_node *dn;
378
379 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
380
381 for_each_node_by_name(dn, "pci")
382 rpaphp_add_slot(dn);
383
384 return 0;
385 }
386
rpaphp_exit(void)387 static void __exit rpaphp_exit(void)
388 {
389 cleanup_slots();
390 }
391
enable_slot(struct hotplug_slot * hotplug_slot)392 static int enable_slot(struct hotplug_slot *hotplug_slot)
393 {
394 struct slot *slot = (struct slot *)hotplug_slot->private;
395 int state;
396 int retval;
397
398 if (slot->state == CONFIGURED)
399 return 0;
400
401 retval = rpaphp_get_sensor_state(slot, &state);
402 if (retval)
403 return retval;
404
405 if (state == PRESENT) {
406 pci_lock_rescan_remove();
407 pci_hp_add_devices(slot->bus);
408 pci_unlock_rescan_remove();
409 slot->state = CONFIGURED;
410 } else if (state == EMPTY) {
411 slot->state = EMPTY;
412 } else {
413 err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
414 slot->state = NOT_VALID;
415 return -EINVAL;
416 }
417
418 slot->bus->max_bus_speed = get_max_bus_speed(slot);
419 return 0;
420 }
421
disable_slot(struct hotplug_slot * hotplug_slot)422 static int disable_slot(struct hotplug_slot *hotplug_slot)
423 {
424 struct slot *slot = (struct slot *)hotplug_slot->private;
425 if (slot->state == NOT_CONFIGURED)
426 return -EINVAL;
427
428 pci_lock_rescan_remove();
429 pci_hp_remove_devices(slot->bus);
430 pci_unlock_rescan_remove();
431 vm_unmap_aliases();
432
433 slot->state = NOT_CONFIGURED;
434 return 0;
435 }
436
437 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
438 .enable_slot = enable_slot,
439 .disable_slot = disable_slot,
440 .set_attention_status = set_attention_status,
441 .get_power_status = get_power_status,
442 .get_attention_status = get_attention_status,
443 .get_adapter_status = get_adapter_status,
444 };
445
446 module_init(rpaphp_init);
447 module_exit(rpaphp_exit);
448