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/slab.h>
31 #include <linux/smp.h>
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"
39
40 int debug;
41 LIST_HEAD(rpaphp_slot_head);
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
53 module_param(debug, bool, 0644);
54
55 /**
56 * set_attention_status - set attention LED
57 * @hotplug_slot: target &hotplug_slot
58 * @value: LED control value
59 *
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)
63 */
64 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
65 {
66 int rc;
67 struct slot *slot = (struct slot *)hotplug_slot->private;
68
69 switch (value) {
70 case 0:
71 case 1:
72 case 2:
73 break;
74 default:
75 value = 1;
76 break;
77 }
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;
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
90 */
91 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
92 {
93 int retval, level;
94 struct slot *slot = (struct slot *)hotplug_slot->private;
95
96 retval = rtas_get_power_level (slot->power_domain, &level);
97 if (!retval)
98 *value = level;
99 return retval;
100 }
101
102 /**
103 * get_attention_status - get attention LED status
104 * @hotplug_slot: slot to get status
105 * @value: pointer to store status
106 */
107 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
108 {
109 struct slot *slot = (struct slot *)hotplug_slot->private;
110 *value = slot->hotplug_slot->info->attention_status;
111 return 0;
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;
117 int rc, state;
118
119 rc = rpaphp_get_sensor_state(slot, &state);
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;
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
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 }
167 return 0;
168 }
169
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 */
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 < 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
259 /**
260 * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
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:
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 */
272 static int is_php_dn(struct device_node *dn, const int **indexes,
273 const int **names, const int **types, const int **power_domains)
274 {
275 const int *drc_types;
276 int rc;
277
278 rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
279 if (rc < 0)
280 return 0;
281
282 if (!is_php_type((char *) &drc_types[1]))
283 return 0;
284
285 *types = drc_types;
286 return 1;
287 }
288
289 /**
290 * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
291 * @dn: device node of slot
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.
302 *
303 * To remove a slot, it suffices to call rpaphp_deregister_slot().
304 */
305 int rpaphp_add_slot(struct device_node *dn)
306 {
307 struct slot *slot;
308 int retval = 0;
309 int i;
310 const int *indexes, *names, *types, *power_domains;
311 char *name, *type;
312
313 if (!dn->name || strcmp(dn->name, "pci"))
314 return 0;
315
316 /* If this is not a hotplug slot, return without doing anything. */
317 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
318 return 0;
319
320 dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name);
321
322 /* register PCI devices */
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);
332
333 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
334 indexes[i + 1], name, type);
335
336 retval = rpaphp_enable_slot(slot);
337 if (!retval)
338 retval = rpaphp_register_slot(slot);
339
340 if (retval)
341 dealloc_slot_struct(slot);
342
343 name += strlen(name) + 1;
344 type += strlen(type) + 1;
345 }
346 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
347
348 /* XXX FIXME: reports a failure only if last entry in loop failed */
349 return retval;
350 }
351
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 {
373 struct device_node *dn = NULL;
374
375 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
376
377 while ((dn = of_find_node_by_name(dn, "pci")))
378 rpaphp_add_slot(dn);
379
380 return 0;
381 }
382
383 static void __exit rpaphp_exit(void)
384 {
385 cleanup_slots();
386 }
387
388 static int enable_slot(struct hotplug_slot *hotplug_slot)
389 {
390 struct slot *slot = (struct slot *)hotplug_slot->private;
391 int state;
392 int retval;
393
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 {
407 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, slot->name);
408 slot->state = NOT_VALID;
409 return -EINVAL;
410 }
411 return 0;
412 }
413
414 static int disable_slot(struct hotplug_slot *hotplug_slot)
415 {
416 struct slot *slot = (struct slot *)hotplug_slot->private;
417 if (slot->state == NOT_CONFIGURED)
418 return -EINVAL;
419
420 pcibios_remove_pci_devices(slot->bus);
421 slot->state = NOT_CONFIGURED;
422 return 0;
423 }
424
425 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
426 .owner = THIS_MODULE,
427 .enable_slot = enable_slot,
428 .disable_slot = disable_slot,
429 .set_attention_status = set_attention_status,
430 .get_power_status = get_power_status,
431 .get_attention_status = get_attention_status,
432 .get_adapter_status = get_adapter_status,
433 .get_max_bus_speed = get_max_bus_speed,
434 };
435
436 module_init(rpaphp_init);
437 module_exit(rpaphp_exit);
438
439 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
440 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
441 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
442
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