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/smp.h>
31 #include <linux/init.h>
32 #include <asm/eeh.h> /* for eeh_add_device() */
33 #include <asm/rtas.h> /* rtas_call */
34 #include <asm/pci-bridge.h> /* for pci_controller */
35 #include "../pci.h" /* for pci_add_new_bus */
36 /* and pci_do_scan_bus */
40 LIST_HEAD(rpaphp_slot_head
);
42 #define DRIVER_VERSION "0.1"
43 #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
44 #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"
46 #define MAX_LOC_CODE 128
48 MODULE_AUTHOR(DRIVER_AUTHOR
);
49 MODULE_DESCRIPTION(DRIVER_DESC
);
50 MODULE_LICENSE("GPL");
52 module_param_named(debug
, rpaphp_debug
, bool, 0644);
55 * set_attention_status - set attention LED
56 * @hotplug_slot: target &hotplug_slot
57 * @value: LED control value
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)
63 static int set_attention_status(struct hotplug_slot
*hotplug_slot
, u8 value
)
66 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
78 rc
= rtas_set_indicator(DR_INDICATOR
, slot
->index
, value
);
80 hotplug_slot
->info
->attention_status
= value
;
86 * get_power_status - get power status of a slot
87 * @hotplug_slot: slot to get status
88 * @value: pointer to store status
90 static int get_power_status(struct hotplug_slot
*hotplug_slot
, u8
* value
)
93 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
95 retval
= rtas_get_power_level (slot
->power_domain
, &level
);
102 * get_attention_status - get attention LED status
103 * @hotplug_slot: slot to get status
104 * @value: pointer to store status
106 static int get_attention_status(struct hotplug_slot
*hotplug_slot
, u8
* value
)
108 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
109 *value
= slot
->hotplug_slot
->info
->attention_status
;
113 static int get_adapter_status(struct hotplug_slot
*hotplug_slot
, u8
* value
)
115 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
118 rc
= rpaphp_get_sensor_state(slot
, &state
);
126 else if (state
== PRESENT
)
127 *value
= slot
->state
;
132 static enum pci_bus_speed
get_max_bus_speed(struct slot
*slot
)
134 enum pci_bus_speed speed
;
135 switch (slot
->type
) {
142 speed
= PCI_SPEED_33MHz
; /* speed for case 1-6 */
146 speed
= PCI_SPEED_66MHz
;
150 speed
= PCI_SPEED_66MHz_PCIX
;
154 speed
= PCI_SPEED_100MHz_PCIX
;
158 speed
= PCI_SPEED_133MHz_PCIX
;
161 speed
= PCI_SPEED_UNKNOWN
;
168 static int get_children_props(struct device_node
*dn
, const int **drc_indexes
,
169 const int **drc_names
, const int **drc_types
,
170 const int **drc_power_domains
)
172 const int *indexes
, *names
, *types
, *domains
;
174 indexes
= of_get_property(dn
, "ibm,drc-indexes", NULL
);
175 names
= of_get_property(dn
, "ibm,drc-names", NULL
);
176 types
= of_get_property(dn
, "ibm,drc-types", NULL
);
177 domains
= of_get_property(dn
, "ibm,drc-power-domains", NULL
);
179 if (!indexes
|| !names
|| !types
|| !domains
) {
180 /* Slot does not have dynamically-removable children */
184 *drc_indexes
= indexes
;
186 /* &drc_names[1] contains NULL terminated slot names */
189 /* &drc_types[1] contains NULL terminated slot types */
191 if (drc_power_domains
)
192 *drc_power_domains
= domains
;
197 /* To get the DRC props describing the current node, first obtain it's
198 * my-drc-index property. Next obtain the DRC list from it's parent. Use
199 * the my-drc-index for correlation, and obtain the requested properties.
201 int rpaphp_get_drc_props(struct device_node
*dn
, int *drc_index
,
202 char **drc_name
, char **drc_type
, int *drc_power_domain
)
204 const int *indexes
, *names
;
205 const int *types
, *domains
;
206 const unsigned int *my_index
;
207 char *name_tmp
, *type_tmp
;
210 my_index
= of_get_property(dn
, "ibm,my-drc-index", NULL
);
212 /* Node isn't DLPAR/hotplug capable */
216 rc
= get_children_props(dn
->parent
, &indexes
, &names
, &types
, &domains
);
221 name_tmp
= (char *) &names
[1];
222 type_tmp
= (char *) &types
[1];
224 /* Iterate through parent properties, looking for my-drc-index */
225 for (i
= 0; i
< indexes
[0]; i
++) {
226 if ((unsigned int) indexes
[i
+ 1] == *my_index
) {
228 *drc_name
= name_tmp
;
230 *drc_type
= type_tmp
;
232 *drc_index
= *my_index
;
233 if (drc_power_domain
)
234 *drc_power_domain
= domains
[i
+1];
237 name_tmp
+= (strlen(name_tmp
) + 1);
238 type_tmp
+= (strlen(type_tmp
) + 1);
244 static int is_php_type(char *drc_type
)
249 /* PCI Hotplug nodes have an integer for drc_type */
250 value
= simple_strtoul(drc_type
, &endptr
, 10);
251 if (endptr
== drc_type
)
258 * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
259 * @dn: target &device_node
260 * @indexes: passed to get_children_props()
261 * @names: passed to get_children_props()
262 * @types: returned from get_children_props()
265 * This routine will return true only if the device node is
266 * a hotpluggable slot. This routine will return false
267 * for built-in pci slots (even when the built-in slots are
270 static int is_php_dn(struct device_node
*dn
, const int **indexes
,
271 const int **names
, const int **types
, const int **power_domains
)
273 const int *drc_types
;
276 rc
= get_children_props(dn
, indexes
, names
, &drc_types
, power_domains
);
280 if (!is_php_type((char *) &drc_types
[1]))
288 * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
289 * @dn: device node of slot
291 * This subroutine will register a hotplugable slot with the
292 * PCI hotplug infrastructure. This routine is typicaly called
293 * during boot time, if the hotplug slots are present at boot time,
294 * or is called later, by the dlpar add code, if the slot is
295 * being dynamically added during runtime.
297 * If the device node points at an embedded (built-in) slot, this
298 * routine will just return without doing anything, since embedded
299 * slots cannot be hotplugged.
301 * To remove a slot, it suffices to call rpaphp_deregister_slot().
303 int rpaphp_add_slot(struct device_node
*dn
)
308 const int *indexes
, *names
, *types
, *power_domains
;
311 if (!dn
->name
|| strcmp(dn
->name
, "pci"))
314 /* If this is not a hotplug slot, return without doing anything. */
315 if (!is_php_dn(dn
, &indexes
, &names
, &types
, &power_domains
))
318 dbg("Entry %s: dn->full_name=%s\n", __func__
, dn
->full_name
);
320 /* register PCI devices */
321 name
= (char *) &names
[1];
322 type
= (char *) &types
[1];
323 for (i
= 0; i
< indexes
[0]; i
++) {
325 slot
= alloc_slot_struct(dn
, indexes
[i
+ 1], name
, power_domains
[i
+ 1]);
329 slot
->type
= simple_strtoul(type
, NULL
, 10);
331 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
332 indexes
[i
+ 1], name
, type
);
334 retval
= rpaphp_enable_slot(slot
);
336 retval
= rpaphp_register_slot(slot
);
339 dealloc_slot_struct(slot
);
341 name
+= strlen(name
) + 1;
342 type
+= strlen(type
) + 1;
344 dbg("%s - Exit: rc[%d]\n", __func__
, retval
);
346 /* XXX FIXME: reports a failure only if last entry in loop failed */
350 static void __exit
cleanup_slots(void)
352 struct list_head
*tmp
, *n
;
356 * Unregister all of our slots with the pci_hotplug subsystem,
357 * and free up all memory that we had allocated.
358 * memory will be freed in release_slot callback.
361 list_for_each_safe(tmp
, n
, &rpaphp_slot_head
) {
362 slot
= list_entry(tmp
, struct slot
, rpaphp_slot_list
);
363 list_del(&slot
->rpaphp_slot_list
);
364 pci_hp_deregister(slot
->hotplug_slot
);
369 static int __init
rpaphp_init(void)
371 struct device_node
*dn
= NULL
;
373 info(DRIVER_DESC
" version: " DRIVER_VERSION
"\n");
375 while ((dn
= of_find_node_by_name(dn
, "pci")))
381 static void __exit
rpaphp_exit(void)
386 static int enable_slot(struct hotplug_slot
*hotplug_slot
)
388 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
392 if (slot
->state
== CONFIGURED
)
395 retval
= rpaphp_get_sensor_state(slot
, &state
);
399 if (state
== PRESENT
) {
400 pcibios_add_pci_devices(slot
->bus
);
401 slot
->state
= CONFIGURED
;
402 } else if (state
== EMPTY
) {
405 err("%s: slot[%s] is in invalid state\n", __func__
, slot
->name
);
406 slot
->state
= NOT_VALID
;
410 slot
->bus
->max_bus_speed
= get_max_bus_speed(slot
);
414 static int disable_slot(struct hotplug_slot
*hotplug_slot
)
416 struct slot
*slot
= (struct slot
*)hotplug_slot
->private;
417 if (slot
->state
== NOT_CONFIGURED
)
420 pcibios_remove_pci_devices(slot
->bus
);
421 slot
->state
= NOT_CONFIGURED
;
425 struct 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
,
434 module_init(rpaphp_init
);
435 module_exit(rpaphp_exit
);
437 EXPORT_SYMBOL_GPL(rpaphp_add_slot
);
438 EXPORT_SYMBOL_GPL(rpaphp_slot_head
);
439 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props
);