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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>
34#include <asm/rtas.h>
35#include <asm/pci-bridge.h>
36#include "../pci.h"
37
38#include "rpaphp.h"
39
40int rpaphp_debug;
41LIST_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
49MODULE_AUTHOR(DRIVER_AUTHOR);
50MODULE_DESCRIPTION(DRIVER_DESC);
51MODULE_LICENSE("GPL");
52
53module_param_named(debug, rpaphp_debug, bool, 0644);
54
55
56
57
58
59
60
61
62
63
64static 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
88
89
90
91static 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
104
105
106
107static 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
114static 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
133static 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;
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
170static 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
183 return -EINVAL;
184 }
185 if (drc_indexes)
186 *drc_indexes = indexes;
187 if (drc_names)
188
189 *drc_names = names;
190 if (drc_types)
191
192 *drc_types = types;
193 if (drc_power_domains)
194 *drc_power_domains = domains;
195
196 return 0;
197}
198
199
200
201
202
203int 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
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
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
246static int is_php_type(char *drc_type)
247{
248 unsigned long value;
249 char *endptr;
250
251
252 value = simple_strtoul(drc_type, &endptr, 10);
253 if (endptr == drc_type)
254 return 0;
255
256 return 1;
257}
258
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270
271
272static 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
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302
303
304
305int 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
317 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
318 return 0;
319
320 dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);
321
322
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", __func__, retval);
347
348
349 return retval;
350}
351
352static void __exit cleanup_slots(void)
353{
354 struct list_head *tmp, *n;
355 struct slot *slot;
356
357
358
359
360
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
371static 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
383static void __exit rpaphp_exit(void)
384{
385 cleanup_slots();
386}
387
388static 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", __func__, slot->name);
408 slot->state = NOT_VALID;
409 return -EINVAL;
410 }
411 return 0;
412}
413
414static 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
425struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
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
435module_init(rpaphp_init);
436module_exit(rpaphp_exit);
437
438EXPORT_SYMBOL_GPL(rpaphp_add_slot);
439EXPORT_SYMBOL_GPL(rpaphp_slot_head);
440EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
441