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
);
45 #define DRIVER_VERSION "0.1"
46 #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
47 #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"
49 #define MAX_LOC_CODE 128
51 MODULE_AUTHOR(DRIVER_AUTHOR
);
52 MODULE_DESCRIPTION(DRIVER_DESC
);
53 MODULE_LICENSE("GPL");
55 module_param(debug
, bool, 0644);
58 * set_attention_status - set attention LED
59 * echo 0 > attention -- set LED OFF
60 * echo 1 > attention -- set LED ON
61 * echo 2 > attention -- set LED ID(identify, light is blinking)
64 static int set_attention_status(struct hotplug_slot
*hotplug_slot
, u8 value
)
67 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
81 rc
= rtas_set_indicator(DR_INDICATOR
, slot
->index
, value
);
83 hotplug_slot
->info
->attention_status
= value
;
89 * get_power_status - get power status of a slot
90 * @hotplug_slot: slot to get status
91 * @value: pointer to store status
93 static int get_power_status(struct hotplug_slot
*hotplug_slot
, u8
* value
)
96 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
99 retval
= rtas_get_power_level (slot
->power_domain
, &level
);
107 * get_attention_status - get attention LED status
109 static int get_attention_status(struct hotplug_slot
*hotplug_slot
, u8
* value
)
111 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
112 *value
= slot
->hotplug_slot
->info
->attention_status
;
116 static int get_adapter_status(struct hotplug_slot
*hotplug_slot
, u8
* value
)
118 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
122 rc
= rpaphp_get_sensor_state(slot
, &state
);
131 else if (state
== PRESENT
)
132 *value
= slot
->state
;
137 static int get_max_bus_speed(struct hotplug_slot
*hotplug_slot
, enum pci_bus_speed
*value
)
139 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
142 switch (slot
->type
) {
149 *value
= PCI_SPEED_33MHz
; /* speed for case 1-6 */
153 *value
= PCI_SPEED_66MHz
;
157 *value
= PCI_SPEED_66MHz_PCIX
;
161 *value
= PCI_SPEED_100MHz_PCIX
;
165 *value
= PCI_SPEED_133MHz_PCIX
;
168 *value
= PCI_SPEED_UNKNOWN
;
176 static int get_children_props(struct device_node
*dn
, const int **drc_indexes
,
177 const int **drc_names
, const int **drc_types
,
178 const int **drc_power_domains
)
180 const int *indexes
, *names
, *types
, *domains
;
182 indexes
= get_property(dn
, "ibm,drc-indexes", NULL
);
183 names
= get_property(dn
, "ibm,drc-names", NULL
);
184 types
= get_property(dn
, "ibm,drc-types", NULL
);
185 domains
= get_property(dn
, "ibm,drc-power-domains", NULL
);
187 if (!indexes
|| !names
|| !types
|| !domains
) {
188 /* Slot does not have dynamically-removable children */
192 *drc_indexes
= indexes
;
194 /* &drc_names[1] contains NULL terminated slot names */
197 /* &drc_types[1] contains NULL terminated slot types */
199 if (drc_power_domains
)
200 *drc_power_domains
= domains
;
205 /* To get the DRC props describing the current node, first obtain it's
206 * my-drc-index property. Next obtain the DRC list from it's parent. Use
207 * the my-drc-index for correlation, and obtain the requested properties.
209 int rpaphp_get_drc_props(struct device_node
*dn
, int *drc_index
,
210 char **drc_name
, char **drc_type
, int *drc_power_domain
)
212 const int *indexes
, *names
;
213 const int *types
, *domains
;
214 const unsigned int *my_index
;
215 char *name_tmp
, *type_tmp
;
218 my_index
= get_property(dn
, "ibm,my-drc-index", NULL
);
220 /* Node isn't DLPAR/hotplug capable */
224 rc
= get_children_props(dn
->parent
, &indexes
, &names
, &types
, &domains
);
229 name_tmp
= (char *) &names
[1];
230 type_tmp
= (char *) &types
[1];
232 /* Iterate through parent properties, looking for my-drc-index */
233 for (i
= 0; i
< indexes
[0]; i
++) {
234 if ((unsigned int) indexes
[i
+ 1] == *my_index
) {
236 *drc_name
= name_tmp
;
238 *drc_type
= type_tmp
;
240 *drc_index
= *my_index
;
241 if (drc_power_domain
)
242 *drc_power_domain
= domains
[i
+1];
245 name_tmp
+= (strlen(name_tmp
) + 1);
246 type_tmp
+= (strlen(type_tmp
) + 1);
252 static int is_php_type(char *drc_type
)
257 /* PCI Hotplug nodes have an integer for drc_type */
258 value
= simple_strtoul(drc_type
, &endptr
, 10);
259 if (endptr
== drc_type
)
265 static int is_php_dn(struct device_node
*dn
, const int **indexes
,
266 const int **names
, const int **types
, const int **power_domains
)
268 const int *drc_types
;
271 rc
= get_children_props(dn
, indexes
, names
, &drc_types
, power_domains
);
273 if (is_php_type((char *) &drc_types
[1])) {
283 * rpaphp_add_slot -- add hotplug or dlpar slot
285 * rpaphp not only registers PCI hotplug slots(HOTPLUG),
286 * but also logical DR slots(EMBEDDED).
287 * HOTPLUG slot: An adapter can be physically added/removed.
288 * EMBEDDED slot: An adapter can be logically removed/added
289 * from/to a partition with the slot.
291 int rpaphp_add_slot(struct device_node
*dn
)
296 const int *indexes
, *names
, *types
, *power_domains
;
299 if (!dn
->name
|| strcmp(dn
->name
, "pci"))
302 if (!is_php_dn(dn
, &indexes
, &names
, &types
, &power_domains
))
305 dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__
, dn
->full_name
);
307 /* register PCI devices */
308 name
= (char *) &names
[1];
309 type
= (char *) &types
[1];
310 for (i
= 0; i
< indexes
[0]; i
++) {
312 slot
= alloc_slot_struct(dn
, indexes
[i
+ 1], name
, power_domains
[i
+ 1]);
316 slot
->type
= simple_strtoul(type
, NULL
, 10);
318 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
319 indexes
[i
+ 1], name
, type
);
321 retval
= rpaphp_register_pci_slot(slot
);
323 retval
= rpaphp_register_slot(slot
);
326 dealloc_slot_struct(slot
);
328 name
+= strlen(name
) + 1;
329 type
+= strlen(type
) + 1;
331 dbg("%s - Exit: rc[%d]\n", __FUNCTION__
, retval
);
333 /* XXX FIXME: reports a failure only if last entry in loop failed */
337 static void __exit
cleanup_slots(void)
339 struct list_head
*tmp
, *n
;
343 * Unregister all of our slots with the pci_hotplug subsystem,
344 * and free up all memory that we had allocated.
345 * memory will be freed in release_slot callback.
348 list_for_each_safe(tmp
, n
, &rpaphp_slot_head
) {
349 slot
= list_entry(tmp
, struct slot
, rpaphp_slot_list
);
350 list_del(&slot
->rpaphp_slot_list
);
351 pci_hp_deregister(slot
->hotplug_slot
);
356 static int __init
rpaphp_init(void)
358 struct device_node
*dn
= NULL
;
360 info(DRIVER_DESC
" version: " DRIVER_VERSION
"\n");
361 init_MUTEX(&rpaphp_sem
);
363 while ((dn
= of_find_node_by_name(dn
, "pci")))
369 static void __exit
rpaphp_exit(void)
374 static int __enable_slot(struct slot
*slot
)
379 if (slot
->state
== CONFIGURED
)
382 retval
= rpaphp_get_sensor_state(slot
, &state
);
386 if (state
== PRESENT
) {
387 pcibios_add_pci_devices(slot
->bus
);
388 slot
->state
= CONFIGURED
;
389 } else if (state
== EMPTY
) {
392 err("%s: slot[%s] is in invalid state\n", __FUNCTION__
, slot
->name
);
393 slot
->state
= NOT_VALID
;
399 static int enable_slot(struct hotplug_slot
*hotplug_slot
)
402 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
405 retval
= __enable_slot(slot
);
411 static int __disable_slot(struct slot
*slot
)
413 struct pci_dev
*dev
, *tmp
;
415 if (slot
->state
== NOT_CONFIGURED
)
418 list_for_each_entry_safe(dev
, tmp
, &slot
->bus
->devices
, bus_list
) {
419 eeh_remove_bus_device(dev
);
420 pci_remove_bus_device(dev
);
423 slot
->state
= NOT_CONFIGURED
;
427 static int disable_slot(struct hotplug_slot
*hotplug_slot
)
429 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
433 retval
= __disable_slot (slot
);
439 struct hotplug_slot_ops rpaphp_hotplug_slot_ops
= {
440 .owner
= THIS_MODULE
,
441 .enable_slot
= enable_slot
,
442 .disable_slot
= disable_slot
,
443 .set_attention_status
= set_attention_status
,
444 .get_power_status
= get_power_status
,
445 .get_attention_status
= get_attention_status
,
446 .get_adapter_status
= get_adapter_status
,
447 .get_max_bus_speed
= get_max_bus_speed
,
450 module_init(rpaphp_init
);
451 module_exit(rpaphp_exit
);
453 EXPORT_SYMBOL_GPL(rpaphp_add_slot
);
454 EXPORT_SYMBOL_GPL(rpaphp_slot_head
);
455 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props
);