2 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
3 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
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.
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
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.
22 * Send feedback to <lxie@us.ibm.com>
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/smp_lock.h>
33 #include <linux/init.h>
34 #include <asm/eeh.h> /* for eeh_add_device() */
35 #include <asm/rtas.h> /* rtas_call */
36 #include <asm/pci-bridge.h> /* for pci_controller */
37 #include "../pci.h" /* for pci_add_new_bus */
38 /* and pci_do_scan_bus */
42 static struct semaphore rpaphp_sem
;
43 LIST_HEAD(rpaphp_slot_head
);
46 #define DRIVER_VERSION "0.1"
47 #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
48 #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"
50 #define MAX_LOC_CODE 128
52 MODULE_AUTHOR(DRIVER_AUTHOR
);
53 MODULE_DESCRIPTION(DRIVER_DESC
);
54 MODULE_LICENSE("GPL");
56 module_param(debug
, bool, 0644);
58 static int rpaphp_get_attention_status(struct slot
*slot
)
60 return slot
->hotplug_slot
->info
->attention_status
;
64 * set_attention_status - set attention LED
65 * echo 0 > attention -- set LED OFF
66 * echo 1 > attention -- set LED ON
67 * echo 2 > attention -- set LED ID(identify, light is blinking)
70 static int set_attention_status(struct hotplug_slot
*hotplug_slot
, u8 value
)
73 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
78 retval
= rpaphp_set_attention_status(slot
, LED_OFF
);
79 hotplug_slot
->info
->attention_status
= 0;
83 retval
= rpaphp_set_attention_status(slot
, LED_ON
);
84 hotplug_slot
->info
->attention_status
= 1;
87 retval
= rpaphp_set_attention_status(slot
, LED_ID
);
88 hotplug_slot
->info
->attention_status
= 2;
96 * get_power_status - get power status of a slot
97 * @hotplug_slot: slot to get status
98 * @value: pointer to store status
102 static int get_power_status(struct hotplug_slot
*hotplug_slot
, u8
* value
)
105 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
108 retval
= rpaphp_get_power_status(slot
, value
);
114 * get_attention_status - get attention LED status
118 static int get_attention_status(struct hotplug_slot
*hotplug_slot
, u8
* value
)
121 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
124 *value
= rpaphp_get_attention_status(slot
);
129 static int get_adapter_status(struct hotplug_slot
*hotplug_slot
, u8
* value
)
131 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
135 retval
= rpaphp_get_pci_adapter_status(slot
, 0, value
);
140 static int get_max_bus_speed(struct hotplug_slot
*hotplug_slot
, enum pci_bus_speed
*value
)
142 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
145 switch (slot
->type
) {
152 *value
= PCI_SPEED_33MHz
; /* speed for case 1-6 */
156 *value
= PCI_SPEED_66MHz
;
160 *value
= PCI_SPEED_66MHz_PCIX
;
164 *value
= PCI_SPEED_100MHz_PCIX
;
168 *value
= PCI_SPEED_133MHz_PCIX
;
171 *value
= PCI_SPEED_UNKNOWN
;
179 static int get_children_props(struct device_node
*dn
, const int **drc_indexes
,
180 const int **drc_names
, const int **drc_types
,
181 const int **drc_power_domains
)
183 const int *indexes
, *names
, *types
, *domains
;
185 indexes
= get_property(dn
, "ibm,drc-indexes", NULL
);
186 names
= get_property(dn
, "ibm,drc-names", NULL
);
187 types
= get_property(dn
, "ibm,drc-types", NULL
);
188 domains
= get_property(dn
, "ibm,drc-power-domains", NULL
);
190 if (!indexes
|| !names
|| !types
|| !domains
) {
191 /* Slot does not have dynamically-removable children */
195 *drc_indexes
= indexes
;
197 /* &drc_names[1] contains NULL terminated slot names */
200 /* &drc_types[1] contains NULL terminated slot types */
202 if (drc_power_domains
)
203 *drc_power_domains
= domains
;
208 /* To get the DRC props describing the current node, first obtain it's
209 * my-drc-index property. Next obtain the DRC list from it's parent. Use
210 * the my-drc-index for correlation, and obtain the requested properties.
212 int rpaphp_get_drc_props(struct device_node
*dn
, int *drc_index
,
213 char **drc_name
, char **drc_type
, int *drc_power_domain
)
215 const int *indexes
, *names
;
216 const int *types
, *domains
;
217 const unsigned int *my_index
;
218 char *name_tmp
, *type_tmp
;
221 my_index
= get_property(dn
, "ibm,my-drc-index", NULL
);
223 /* Node isn't DLPAR/hotplug capable */
227 rc
= get_children_props(dn
->parent
, &indexes
, &names
, &types
, &domains
);
232 name_tmp
= (char *) &names
[1];
233 type_tmp
= (char *) &types
[1];
235 /* Iterate through parent properties, looking for my-drc-index */
236 for (i
= 0; i
< indexes
[0]; i
++) {
237 if ((unsigned int) indexes
[i
+ 1] == *my_index
) {
239 *drc_name
= name_tmp
;
241 *drc_type
= type_tmp
;
243 *drc_index
= *my_index
;
244 if (drc_power_domain
)
245 *drc_power_domain
= domains
[i
+1];
248 name_tmp
+= (strlen(name_tmp
) + 1);
249 type_tmp
+= (strlen(type_tmp
) + 1);
255 static int is_php_type(char *drc_type
)
260 /* PCI Hotplug nodes have an integer for drc_type */
261 value
= simple_strtoul(drc_type
, &endptr
, 10);
262 if (endptr
== drc_type
)
268 static int is_php_dn(struct device_node
*dn
, const int **indexes
,
269 const int **names
, const int **types
, const int **power_domains
)
271 const int *drc_types
;
274 rc
= get_children_props(dn
, indexes
, names
, &drc_types
, power_domains
);
276 if (is_php_type((char *) &drc_types
[1])) {
286 * rpaphp_add_slot -- add hotplug or dlpar slot
288 * rpaphp not only registers PCI hotplug slots(HOTPLUG),
289 * but also logical DR slots(EMBEDDED).
290 * HOTPLUG slot: An adapter can be physically added/removed.
291 * EMBEDDED slot: An adapter can be logically removed/added
292 * from/to a partition with the slot.
294 int rpaphp_add_slot(struct device_node
*dn
)
299 const int *indexes
, *names
, *types
, *power_domains
;
302 if (!dn
->name
|| strcmp(dn
->name
, "pci"))
305 if (!is_php_dn(dn
, &indexes
, &names
, &types
, &power_domains
))
308 dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__
, dn
->full_name
);
310 /* register PCI devices */
311 name
= (char *) &names
[1];
312 type
= (char *) &types
[1];
313 for (i
= 0; i
< indexes
[0]; i
++) {
315 slot
= alloc_slot_struct(dn
, indexes
[i
+ 1], name
, power_domains
[i
+ 1]);
319 slot
->type
= simple_strtoul(type
, NULL
, 10);
321 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
322 indexes
[i
+ 1], name
, type
);
324 retval
= rpaphp_register_pci_slot(slot
);
325 name
+= strlen(name
) + 1;
326 type
+= strlen(type
) + 1;
328 dbg("%s - Exit: num_slots=%d rc[%d]\n",
329 __FUNCTION__
, num_slots
, retval
);
333 static void __exit
cleanup_slots(void)
335 struct list_head
*tmp
, *n
;
339 * Unregister all of our slots with the pci_hotplug subsystem,
340 * and free up all memory that we had allocated.
341 * memory will be freed in release_slot callback.
344 list_for_each_safe(tmp
, n
, &rpaphp_slot_head
) {
345 slot
= list_entry(tmp
, struct slot
, rpaphp_slot_list
);
346 list_del(&slot
->rpaphp_slot_list
);
347 pci_hp_deregister(slot
->hotplug_slot
);
352 static int __init
rpaphp_init(void)
354 struct device_node
*dn
= NULL
;
356 info(DRIVER_DESC
" version: " DRIVER_VERSION
"\n");
357 init_MUTEX(&rpaphp_sem
);
359 while ((dn
= of_find_node_by_name(dn
, "pci")))
365 static void __exit
rpaphp_exit(void)
370 static int __enable_slot(struct slot
*slot
)
375 if (slot
->state
== CONFIGURED
)
378 retval
= rpaphp_get_sensor_state(slot
, &state
);
382 if (state
== PRESENT
) {
383 pcibios_add_pci_devices(slot
->bus
);
384 slot
->state
= CONFIGURED
;
385 } else if (state
== EMPTY
) {
388 err("%s: slot[%s] is in invalid state\n", __FUNCTION__
, slot
->name
);
389 slot
->state
= NOT_VALID
;
395 static int enable_slot(struct hotplug_slot
*hotplug_slot
)
398 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
401 retval
= __enable_slot(slot
);
407 static int __disable_slot(struct slot
*slot
)
409 struct pci_dev
*dev
, *tmp
;
411 if (slot
->state
== NOT_CONFIGURED
)
414 list_for_each_entry_safe(dev
, tmp
, &slot
->bus
->devices
, bus_list
) {
415 eeh_remove_bus_device(dev
);
416 pci_remove_bus_device(dev
);
419 slot
->state
= NOT_CONFIGURED
;
423 static int disable_slot(struct hotplug_slot
*hotplug_slot
)
425 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
429 retval
= __disable_slot (slot
);
435 struct hotplug_slot_ops rpaphp_hotplug_slot_ops
= {
436 .owner
= THIS_MODULE
,
437 .enable_slot
= enable_slot
,
438 .disable_slot
= disable_slot
,
439 .set_attention_status
= set_attention_status
,
440 .get_power_status
= get_power_status
,
441 .get_attention_status
= get_attention_status
,
442 .get_adapter_status
= get_adapter_status
,
443 .get_max_bus_speed
= get_max_bus_speed
,
446 module_init(rpaphp_init
);
447 module_exit(rpaphp_exit
);
449 EXPORT_SYMBOL_GPL(rpaphp_add_slot
);
450 EXPORT_SYMBOL_GPL(rpaphp_slot_head
);
451 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props
);