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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
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 * 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 */
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 * get_power_status - get power status of a slot
88 * @hotplug_slot: slot to get status
89 * @value: pointer to store status
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 * get_attention_status - get attention LED status
104 * @hotplug_slot: slot to get status
105 * @value: pointer to store status
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 enum pci_bus_speed get_max_bus_speed(struct slot *slot)
134{
135 enum pci_bus_speed speed;
136 switch (slot->type) {
137 case 1:
138 case 2:
139 case 3:
140 case 4:
141 case 5:
142 case 6:
143 speed = PCI_SPEED_33MHz; /* speed for case 1-6 */
144 break;
145 case 7:
146 case 8:
147 speed = PCI_SPEED_66MHz;
148 break;
149 case 11:
150 case 14:
151 speed = PCI_SPEED_66MHz_PCIX;
152 break;
153 case 12:
154 case 15:
155 speed = PCI_SPEED_100MHz_PCIX;
156 break;
157 case 13:
158 case 16:
159 speed = PCI_SPEED_133MHz_PCIX;
160 break;
161 default:
162 speed = PCI_SPEED_UNKNOWN;
163 break;
164 }
165
166 return speed;
167}
168
169static int get_children_props(struct device_node *dn, const int **drc_indexes,
170 const int **drc_names, const int **drc_types,
171 const int **drc_power_domains)
172{
173 const int *indexes, *names, *types, *domains;
174
175 indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
176 names = of_get_property(dn, "ibm,drc-names", NULL);
177 types = of_get_property(dn, "ibm,drc-types", NULL);
178 domains = of_get_property(dn, "ibm,drc-power-domains", NULL);
179
180 if (!indexes || !names || !types || !domains) {
181 /* Slot does not have dynamically-removable children */
182 return -EINVAL;
183 }
184 if (drc_indexes)
185 *drc_indexes = indexes;
186 if (drc_names)
187 /* &drc_names[1] contains NULL terminated slot names */
188 *drc_names = names;
189 if (drc_types)
190 /* &drc_types[1] contains NULL terminated slot types */
191 *drc_types = types;
192 if (drc_power_domains)
193 *drc_power_domains = domains;
194
195 return 0;
196}
197
198/* To get the DRC props describing the current node, first obtain it's
199 * my-drc-index property. Next obtain the DRC list from it's parent. Use
200 * the my-drc-index for correlation, and obtain the requested properties.
201 */
202int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
203 char **drc_name, char **drc_type, int *drc_power_domain)
204{
205 const int *indexes, *names;
206 const int *types, *domains;
207 const unsigned int *my_index;
208 char *name_tmp, *type_tmp;
209 int i, rc;
210
211 my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
212 if (!my_index) {
213 /* Node isn't DLPAR/hotplug capable */
214 return -EINVAL;
215 }
216
217 rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
218 if (rc < 0) {
219 return -EINVAL;
220 }
221
222 name_tmp = (char *) &names[1];
223 type_tmp = (char *) &types[1];
224
225 /* Iterate through parent properties, looking for my-drc-index */
226 for (i = 0; i < indexes[0]; i++) {
227 if ((unsigned int) indexes[i + 1] == *my_index) {
228 if (drc_name)
229 *drc_name = name_tmp;
230 if (drc_type)
231 *drc_type = type_tmp;
232 if (drc_index)
233 *drc_index = *my_index;
234 if (drc_power_domain)
235 *drc_power_domain = domains[i+1];
236 return 0;
237 }
238 name_tmp += (strlen(name_tmp) + 1);
239 type_tmp += (strlen(type_tmp) + 1);
240 }
241
242 return -EINVAL;
243}
244
245static int is_php_type(char *drc_type)
246{
247 unsigned long value;
248 char *endptr;
249
250 /* PCI Hotplug nodes have an integer for drc_type */
251 value = simple_strtoul(drc_type, &endptr, 10);
252 if (endptr == drc_type)
253 return 0;
254
255 return 1;
256}
257
258/**
259 * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
260 * @dn: target &device_node
261 * @indexes: passed to get_children_props()
262 * @names: passed to get_children_props()
263 * @types: returned from get_children_props()
264 * @power_domains:
265 *
266 * This routine will return true only if the device node is
267 * a hotpluggable slot. This routine will return false
268 * for built-in pci slots (even when the built-in slots are
269 * dlparable.)
270 */
271static int is_php_dn(struct device_node *dn, const int **indexes,
272 const int **names, const int **types, const int **power_domains)
273{
274 const int *drc_types;
275 int rc;
276
277 rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
278 if (rc < 0)
279 return 0;
280
281 if (!is_php_type((char *) &drc_types[1]))
282 return 0;
283
284 *types = drc_types;
285 return 1;
286}
287
288/**
289 * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
290 * @dn: device node of slot
291 *
292 * This subroutine will register a hotplugable slot with the
293 * PCI hotplug infrastructure. This routine is typically called
294 * during boot time, if the hotplug slots are present at boot time,
295 * or is called later, by the dlpar add code, if the slot is
296 * being dynamically added during runtime.
297 *
298 * If the device node points at an embedded (built-in) slot, this
299 * routine will just return without doing anything, since embedded
300 * slots cannot be hotplugged.
301 *
302 * To remove a slot, it suffices to call rpaphp_deregister_slot().
303 */
304int rpaphp_add_slot(struct device_node *dn)
305{
306 struct slot *slot;
307 int retval = 0;
308 int i;
309 const int *indexes, *names, *types, *power_domains;
310 char *name, *type;
311
312 if (!dn->name || strcmp(dn->name, "pci"))
313 return 0;
314
315 /* If this is not a hotplug slot, return without doing anything. */
316 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
317 return 0;
318
319 dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);
320
321 /* register PCI devices */
322 name = (char *) &names[1];
323 type = (char *) &types[1];
324 for (i = 0; i < indexes[0]; i++) {
325
326 slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);
327 if (!slot)
328 return -ENOMEM;
329
330 slot->type = simple_strtoul(type, NULL, 10);
331
332 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
333 indexes[i + 1], name, type);
334
335 retval = rpaphp_enable_slot(slot);
336 if (!retval)
337 retval = rpaphp_register_slot(slot);
338
339 if (retval)
340 dealloc_slot_struct(slot);
341
342 name += strlen(name) + 1;
343 type += strlen(type) + 1;
344 }
345 dbg("%s - Exit: rc[%d]\n", __func__, retval);
346
347 /* XXX FIXME: reports a failure only if last entry in loop failed */
348 return retval;
349}
350
351static void __exit cleanup_slots(void)
352{
353 struct list_head *tmp, *n;
354 struct slot *slot;
355
356 /*
357 * Unregister all of our slots with the pci_hotplug subsystem,
358 * and free up all memory that we had allocated.
359 * memory will be freed in release_slot callback.
360 */
361
362 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
363 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
364 list_del(&slot->rpaphp_slot_list);
365 pci_hp_deregister(slot->hotplug_slot);
366 }
367 return;
368}
369
370static int __init rpaphp_init(void)
371{
372 struct device_node *dn = NULL;
373
374 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
375
376 while ((dn = of_find_node_by_name(dn, "pci")))
377 rpaphp_add_slot(dn);
378
379 return 0;
380}
381
382static void __exit rpaphp_exit(void)
383{
384 cleanup_slots();
385}
386
387static int enable_slot(struct hotplug_slot *hotplug_slot)
388{
389 struct slot *slot = (struct slot *)hotplug_slot->private;
390 int state;
391 int retval;
392
393 if (slot->state == CONFIGURED)
394 return 0;
395
396 retval = rpaphp_get_sensor_state(slot, &state);
397 if (retval)
398 return retval;
399
400 if (state == PRESENT) {
401 pcibios_add_pci_devices(slot->bus);
402 slot->state = CONFIGURED;
403 } else if (state == EMPTY) {
404 slot->state = EMPTY;
405 } else {
406 err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
407 slot->state = NOT_VALID;
408 return -EINVAL;
409 }
410
411 slot->bus->max_bus_speed = get_max_bus_speed(slot);
412 return 0;
413}
414
415static int disable_slot(struct hotplug_slot *hotplug_slot)
416{
417 struct slot *slot = (struct slot *)hotplug_slot->private;
418 if (slot->state == NOT_CONFIGURED)
419 return -EINVAL;
420
421 pcibios_remove_pci_devices(slot->bus);
422 vm_unmap_aliases();
423
424 slot->state = NOT_CONFIGURED;
425 return 0;
426}
427
428struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
429 .enable_slot = enable_slot,
430 .disable_slot = disable_slot,
431 .set_attention_status = set_attention_status,
432 .get_power_status = get_power_status,
433 .get_attention_status = get_attention_status,
434 .get_adapter_status = get_adapter_status,
435};
436
437module_init(rpaphp_init);
438module_exit(rpaphp_exit);
439
440EXPORT_SYMBOL_GPL(rpaphp_add_slot);
441EXPORT_SYMBOL_GPL(rpaphp_slot_head);
442EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
4 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
5 *
6 * All rights reserved.
7 *
8 * Send feedback to <lxie@us.ibm.com>
9 *
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/moduleparam.h>
14#include <linux/of.h>
15#include <linux/pci.h>
16#include <linux/pci_hotplug.h>
17#include <linux/smp.h>
18#include <linux/init.h>
19#include <linux/vmalloc.h>
20#include <asm/firmware.h>
21#include <asm/eeh.h> /* for eeh_add_device() */
22#include <asm/rtas.h> /* rtas_call */
23#include <asm/pci-bridge.h> /* for pci_controller */
24#include <asm/prom.h>
25#include "../pci.h" /* for pci_add_new_bus */
26 /* and pci_do_scan_bus */
27#include "rpaphp.h"
28
29bool rpaphp_debug;
30LIST_HEAD(rpaphp_slot_head);
31EXPORT_SYMBOL_GPL(rpaphp_slot_head);
32
33#define DRIVER_VERSION "0.1"
34#define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
35#define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"
36
37#define MAX_LOC_CODE 128
38
39MODULE_AUTHOR(DRIVER_AUTHOR);
40MODULE_DESCRIPTION(DRIVER_DESC);
41MODULE_LICENSE("GPL");
42
43module_param_named(debug, rpaphp_debug, bool, 0644);
44
45/**
46 * set_attention_status - set attention LED
47 * @hotplug_slot: target &hotplug_slot
48 * @value: LED control value
49 *
50 * echo 0 > attention -- set LED OFF
51 * echo 1 > attention -- set LED ON
52 * echo 2 > attention -- set LED ID(identify, light is blinking)
53 */
54static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
55{
56 int rc;
57 struct slot *slot = to_slot(hotplug_slot);
58
59 switch (value) {
60 case 0:
61 case 1:
62 case 2:
63 break;
64 default:
65 value = 1;
66 break;
67 }
68
69 rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
70 if (!rc)
71 slot->attention_status = value;
72
73 return rc;
74}
75
76/**
77 * get_power_status - get power status of a slot
78 * @hotplug_slot: slot to get status
79 * @value: pointer to store status
80 */
81static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
82{
83 int retval, level;
84 struct slot *slot = to_slot(hotplug_slot);
85
86 retval = rtas_get_power_level(slot->power_domain, &level);
87 if (!retval)
88 *value = level;
89 return retval;
90}
91
92/**
93 * get_attention_status - get attention LED status
94 * @hotplug_slot: slot to get status
95 * @value: pointer to store status
96 */
97static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
98{
99 struct slot *slot = to_slot(hotplug_slot);
100 *value = slot->attention_status;
101 return 0;
102}
103
104static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
105{
106 struct slot *slot = to_slot(hotplug_slot);
107 int rc, state;
108
109 rc = rpaphp_get_sensor_state(slot, &state);
110
111 *value = NOT_VALID;
112 if (rc)
113 return rc;
114
115 if (state == EMPTY)
116 *value = EMPTY;
117 else if (state == PRESENT)
118 *value = slot->state;
119
120 return 0;
121}
122
123static enum pci_bus_speed get_max_bus_speed(struct slot *slot)
124{
125 enum pci_bus_speed speed;
126 switch (slot->type) {
127 case 1:
128 case 2:
129 case 3:
130 case 4:
131 case 5:
132 case 6:
133 speed = PCI_SPEED_33MHz; /* speed for case 1-6 */
134 break;
135 case 7:
136 case 8:
137 speed = PCI_SPEED_66MHz;
138 break;
139 case 11:
140 case 14:
141 speed = PCI_SPEED_66MHz_PCIX;
142 break;
143 case 12:
144 case 15:
145 speed = PCI_SPEED_100MHz_PCIX;
146 break;
147 case 13:
148 case 16:
149 speed = PCI_SPEED_133MHz_PCIX;
150 break;
151 default:
152 speed = PCI_SPEED_UNKNOWN;
153 break;
154 }
155
156 return speed;
157}
158
159static int get_children_props(struct device_node *dn, const __be32 **drc_indexes,
160 const __be32 **drc_names, const __be32 **drc_types,
161 const __be32 **drc_power_domains)
162{
163 const __be32 *indexes, *names, *types, *domains;
164
165 indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
166 names = of_get_property(dn, "ibm,drc-names", NULL);
167 types = of_get_property(dn, "ibm,drc-types", NULL);
168 domains = of_get_property(dn, "ibm,drc-power-domains", NULL);
169
170 if (!indexes || !names || !types || !domains) {
171 /* Slot does not have dynamically-removable children */
172 return -EINVAL;
173 }
174 if (drc_indexes)
175 *drc_indexes = indexes;
176 if (drc_names)
177 /* &drc_names[1] contains NULL terminated slot names */
178 *drc_names = names;
179 if (drc_types)
180 /* &drc_types[1] contains NULL terminated slot types */
181 *drc_types = types;
182 if (drc_power_domains)
183 *drc_power_domains = domains;
184
185 return 0;
186}
187
188
189/* Verify the existence of 'drc_name' and/or 'drc_type' within the
190 * current node. First obtain its my-drc-index property. Next,
191 * obtain the DRC info from its parent. Use the my-drc-index for
192 * correlation, and obtain/validate the requested properties.
193 */
194
195static int rpaphp_check_drc_props_v1(struct device_node *dn, char *drc_name,
196 char *drc_type, unsigned int my_index)
197{
198 char *name_tmp, *type_tmp;
199 const __be32 *indexes, *names;
200 const __be32 *types, *domains;
201 int i, rc;
202
203 rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
204 if (rc < 0) {
205 return -EINVAL;
206 }
207
208 name_tmp = (char *) &names[1];
209 type_tmp = (char *) &types[1];
210
211 /* Iterate through parent properties, looking for my-drc-index */
212 for (i = 0; i < be32_to_cpu(indexes[0]); i++) {
213 if (be32_to_cpu(indexes[i + 1]) == my_index)
214 break;
215
216 name_tmp += (strlen(name_tmp) + 1);
217 type_tmp += (strlen(type_tmp) + 1);
218 }
219
220 if (((drc_name == NULL) || (drc_name && !strcmp(drc_name, name_tmp))) &&
221 ((drc_type == NULL) || (drc_type && !strcmp(drc_type, type_tmp))))
222 return 0;
223
224 return -EINVAL;
225}
226
227static int rpaphp_check_drc_props_v2(struct device_node *dn, char *drc_name,
228 char *drc_type, unsigned int my_index)
229{
230 struct property *info;
231 unsigned int entries;
232 struct of_drc_info drc;
233 const __be32 *value;
234 char cell_drc_name[MAX_DRC_NAME_LEN];
235 int j;
236
237 info = of_find_property(dn->parent, "ibm,drc-info", NULL);
238 if (info == NULL)
239 return -EINVAL;
240
241 value = of_prop_next_u32(info, NULL, &entries);
242 if (!value)
243 return -EINVAL;
244 else
245 value++;
246
247 for (j = 0; j < entries; j++) {
248 of_read_drc_info_cell(&info, &value, &drc);
249
250 /* Should now know end of current entry */
251
252 /* Found it */
253 if (my_index >= drc.drc_index_start && my_index <= drc.last_drc_index) {
254 int index = my_index - drc.drc_index_start;
255 sprintf(cell_drc_name, "%s%d", drc.drc_name_prefix,
256 drc.drc_name_suffix_start + index);
257 break;
258 }
259 }
260
261 if (((drc_name == NULL) ||
262 (drc_name && !strcmp(drc_name, cell_drc_name))) &&
263 ((drc_type == NULL) ||
264 (drc_type && !strcmp(drc_type, drc.drc_type))))
265 return 0;
266
267 return -EINVAL;
268}
269
270int rpaphp_check_drc_props(struct device_node *dn, char *drc_name,
271 char *drc_type)
272{
273 const __be32 *my_index;
274
275 my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
276 if (!my_index) {
277 /* Node isn't DLPAR/hotplug capable */
278 return -EINVAL;
279 }
280
281 if (of_property_present(dn->parent, "ibm,drc-info"))
282 return rpaphp_check_drc_props_v2(dn, drc_name, drc_type,
283 be32_to_cpu(*my_index));
284 else
285 return rpaphp_check_drc_props_v1(dn, drc_name, drc_type,
286 be32_to_cpu(*my_index));
287}
288EXPORT_SYMBOL_GPL(rpaphp_check_drc_props);
289
290
291static int is_php_type(char *drc_type)
292{
293 char *endptr;
294
295 /* PCI Hotplug nodes have an integer for drc_type */
296 simple_strtoul(drc_type, &endptr, 10);
297 if (endptr == drc_type)
298 return 0;
299
300 return 1;
301}
302
303/**
304 * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
305 * @dn: target &device_node
306 * @indexes: passed to get_children_props()
307 * @names: passed to get_children_props()
308 * @types: returned from get_children_props()
309 * @power_domains:
310 *
311 * This routine will return true only if the device node is
312 * a hotpluggable slot. This routine will return false
313 * for built-in pci slots (even when the built-in slots are
314 * dlparable.)
315 */
316static int is_php_dn(struct device_node *dn, const __be32 **indexes,
317 const __be32 **names, const __be32 **types,
318 const __be32 **power_domains)
319{
320 const __be32 *drc_types;
321 int rc;
322
323 rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
324 if (rc < 0)
325 return 0;
326
327 if (!is_php_type((char *) &drc_types[1]))
328 return 0;
329
330 *types = drc_types;
331 return 1;
332}
333
334static int rpaphp_drc_info_add_slot(struct device_node *dn)
335{
336 struct slot *slot;
337 struct property *info;
338 struct of_drc_info drc;
339 char drc_name[MAX_DRC_NAME_LEN];
340 const __be32 *cur;
341 u32 count;
342 int retval = 0;
343
344 info = of_find_property(dn, "ibm,drc-info", NULL);
345 if (!info)
346 return 0;
347
348 cur = of_prop_next_u32(info, NULL, &count);
349 if (cur)
350 cur++;
351 else
352 return 0;
353
354 of_read_drc_info_cell(&info, &cur, &drc);
355 if (!is_php_type(drc.drc_type))
356 return 0;
357
358 sprintf(drc_name, "%s%d", drc.drc_name_prefix, drc.drc_name_suffix_start);
359
360 slot = alloc_slot_struct(dn, drc.drc_index_start, drc_name, drc.drc_power_domain);
361 if (!slot)
362 return -ENOMEM;
363
364 slot->type = simple_strtoul(drc.drc_type, NULL, 10);
365 retval = rpaphp_enable_slot(slot);
366 if (!retval)
367 retval = rpaphp_register_slot(slot);
368
369 if (retval)
370 dealloc_slot_struct(slot);
371
372 return retval;
373}
374
375static int rpaphp_drc_add_slot(struct device_node *dn)
376{
377 struct slot *slot;
378 int retval = 0;
379 int i;
380 const __be32 *indexes, *names, *types, *power_domains;
381 char *name, *type;
382
383 /* If this is not a hotplug slot, return without doing anything. */
384 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
385 return 0;
386
387 dbg("Entry %s: dn=%pOF\n", __func__, dn);
388
389 /* register PCI devices */
390 name = (char *) &names[1];
391 type = (char *) &types[1];
392 for (i = 0; i < be32_to_cpu(indexes[0]); i++) {
393 int index;
394
395 index = be32_to_cpu(indexes[i + 1]);
396 slot = alloc_slot_struct(dn, index, name,
397 be32_to_cpu(power_domains[i + 1]));
398 if (!slot)
399 return -ENOMEM;
400
401 slot->type = simple_strtoul(type, NULL, 10);
402
403 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
404 index, name, type);
405
406 retval = rpaphp_enable_slot(slot);
407 if (!retval)
408 retval = rpaphp_register_slot(slot);
409
410 if (retval)
411 dealloc_slot_struct(slot);
412
413 name += strlen(name) + 1;
414 type += strlen(type) + 1;
415 }
416 dbg("%s - Exit: rc[%d]\n", __func__, retval);
417
418 /* XXX FIXME: reports a failure only if last entry in loop failed */
419 return retval;
420}
421
422/**
423 * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
424 * @dn: device node of slot
425 *
426 * This subroutine will register a hotpluggable slot with the
427 * PCI hotplug infrastructure. This routine is typically called
428 * during boot time, if the hotplug slots are present at boot time,
429 * or is called later, by the dlpar add code, if the slot is
430 * being dynamically added during runtime.
431 *
432 * If the device node points at an embedded (built-in) slot, this
433 * routine will just return without doing anything, since embedded
434 * slots cannot be hotplugged.
435 *
436 * To remove a slot, it suffices to call rpaphp_deregister_slot().
437 */
438int rpaphp_add_slot(struct device_node *dn)
439{
440 if (!of_node_name_eq(dn, "pci"))
441 return 0;
442
443 if (of_property_present(dn, "ibm,drc-info"))
444 return rpaphp_drc_info_add_slot(dn);
445 else
446 return rpaphp_drc_add_slot(dn);
447}
448EXPORT_SYMBOL_GPL(rpaphp_add_slot);
449
450static void __exit cleanup_slots(void)
451{
452 struct slot *slot, *next;
453
454 /*
455 * Unregister all of our slots with the pci_hotplug subsystem,
456 * and free up all memory that we had allocated.
457 */
458
459 list_for_each_entry_safe(slot, next, &rpaphp_slot_head,
460 rpaphp_slot_list) {
461 list_del(&slot->rpaphp_slot_list);
462 pci_hp_deregister(&slot->hotplug_slot);
463 dealloc_slot_struct(slot);
464 }
465}
466
467static int __init rpaphp_init(void)
468{
469 struct device_node *dn;
470
471 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
472
473 for_each_node_by_name(dn, "pci")
474 rpaphp_add_slot(dn);
475
476 return 0;
477}
478
479static void __exit rpaphp_exit(void)
480{
481 cleanup_slots();
482}
483
484static int enable_slot(struct hotplug_slot *hotplug_slot)
485{
486 struct slot *slot = to_slot(hotplug_slot);
487 int state;
488 int retval;
489
490 if (slot->state == CONFIGURED)
491 return 0;
492
493 retval = rpaphp_get_sensor_state(slot, &state);
494 if (retval)
495 return retval;
496
497 if (state == PRESENT) {
498 pseries_eeh_init_edev_recursive(PCI_DN(slot->dn));
499
500 pci_lock_rescan_remove();
501 pci_hp_add_devices(slot->bus);
502 pci_unlock_rescan_remove();
503 slot->state = CONFIGURED;
504 } else if (state == EMPTY) {
505 slot->state = EMPTY;
506 } else {
507 err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
508 slot->state = NOT_VALID;
509 return -EINVAL;
510 }
511
512 slot->bus->max_bus_speed = get_max_bus_speed(slot);
513 return 0;
514}
515
516static int disable_slot(struct hotplug_slot *hotplug_slot)
517{
518 struct slot *slot = to_slot(hotplug_slot);
519 if (slot->state == NOT_CONFIGURED)
520 return -EINVAL;
521
522 pci_lock_rescan_remove();
523 pci_hp_remove_devices(slot->bus);
524 pci_unlock_rescan_remove();
525 vm_unmap_aliases();
526
527 slot->state = NOT_CONFIGURED;
528 return 0;
529}
530
531const struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
532 .enable_slot = enable_slot,
533 .disable_slot = disable_slot,
534 .set_attention_status = set_attention_status,
535 .get_power_status = get_power_status,
536 .get_attention_status = get_attention_status,
537 .get_adapter_status = get_adapter_status,
538};
539
540module_init(rpaphp_init);
541module_exit(rpaphp_exit);