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 LIST_HEAD(rpaphp_slot_head);
44 #define DRIVER_VERSION "0.1"
45 #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
46 #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"
48 #define MAX_LOC_CODE 128
50 MODULE_AUTHOR(DRIVER_AUTHOR);
51 MODULE_DESCRIPTION(DRIVER_DESC);
52 MODULE_LICENSE("GPL");
54 module_param(debug, bool, 0644);
57 * set_attention_status - set attention LED
58 * echo 0 > attention -- set LED OFF
59 * echo 1 > attention -- set LED ON
60 * 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
104 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
106 struct slot *slot = (struct slot *)hotplug_slot->private;
107 *value = slot->hotplug_slot->info->attention_status;
111 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
113 struct slot *slot = (struct slot *)hotplug_slot->private;
116 rc = rpaphp_get_sensor_state(slot, &state);
124 else if (state == PRESENT)
125 *value = slot->state;
130 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
132 struct slot *slot = (struct slot *)hotplug_slot->private;
134 switch (slot->type) {
141 *value = PCI_SPEED_33MHz; /* speed for case 1-6 */
145 *value = PCI_SPEED_66MHz;
149 *value = PCI_SPEED_66MHz_PCIX;
153 *value = PCI_SPEED_100MHz_PCIX;
157 *value = PCI_SPEED_133MHz_PCIX;
160 *value = PCI_SPEED_UNKNOWN;
167 static int get_children_props(struct device_node *dn, const int **drc_indexes,
168 const int **drc_names, const int **drc_types,
169 const int **drc_power_domains)
171 const int *indexes, *names, *types, *domains;
173 indexes = get_property(dn, "ibm,drc-indexes", NULL);
174 names = get_property(dn, "ibm,drc-names", NULL);
175 types = get_property(dn, "ibm,drc-types", NULL);
176 domains = get_property(dn, "ibm,drc-power-domains", NULL);
178 if (!indexes || !names || !types || !domains) {
179 /* Slot does not have dynamically-removable children */
183 *drc_indexes = indexes;
185 /* &drc_names[1] contains NULL terminated slot names */
188 /* &drc_types[1] contains NULL terminated slot types */
190 if (drc_power_domains)
191 *drc_power_domains = domains;
196 /* To get the DRC props describing the current node, first obtain it's
197 * my-drc-index property. Next obtain the DRC list from it's parent. Use
198 * the my-drc-index for correlation, and obtain the requested properties.
200 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
201 char **drc_name, char **drc_type, int *drc_power_domain)
203 const int *indexes, *names;
204 const int *types, *domains;
205 const unsigned int *my_index;
206 char *name_tmp, *type_tmp;
209 my_index = get_property(dn, "ibm,my-drc-index", NULL);
211 /* Node isn't DLPAR/hotplug capable */
215 rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
220 name_tmp = (char *) &names[1];
221 type_tmp = (char *) &types[1];
223 /* Iterate through parent properties, looking for my-drc-index */
224 for (i = 0; i < indexes[0]; i++) {
225 if ((unsigned int) indexes[i + 1] == *my_index) {
227 *drc_name = name_tmp;
229 *drc_type = type_tmp;
231 *drc_index = *my_index;
232 if (drc_power_domain)
233 *drc_power_domain = domains[i+1];
236 name_tmp += (strlen(name_tmp) + 1);
237 type_tmp += (strlen(type_tmp) + 1);
243 static int is_php_type(char *drc_type)
248 /* PCI Hotplug nodes have an integer for drc_type */
249 value = simple_strtoul(drc_type, &endptr, 10);
250 if (endptr == drc_type)
257 * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
259 * This routine will return true only if the device node is
260 * a hotpluggable slot. This routine will return false
261 * for built-in pci slots (even when the built-in slots are
264 static int is_php_dn(struct device_node *dn, const int **indexes,
265 const int **names, const int **types, const int **power_domains)
267 const int *drc_types;
270 rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
274 if (!is_php_type((char *) &drc_types[1]))
282 * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
283 * @dn device node of slot
285 * This subroutine will register a hotplugable slot with the
286 * PCI hotplug infrastructure. This routine is typicaly called
287 * during boot time, if the hotplug slots are present at boot time,
288 * or is called later, by the dlpar add code, if the slot is
289 * being dynamically added during runtime.
291 * If the device node points at an embedded (built-in) slot, this
292 * routine will just return without doing anything, since embedded
293 * slots cannot be hotplugged.
295 * To remove a slot, it suffices to call rpaphp_deregister_slot()
297 int rpaphp_add_slot(struct device_node *dn)
302 const int *indexes, *names, *types, *power_domains;
305 if (!dn->name || strcmp(dn->name, "pci"))
308 /* If this is not a hotplug slot, return without doing anything. */
309 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
312 dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name);
314 /* register PCI devices */
315 name = (char *) &names[1];
316 type = (char *) &types[1];
317 for (i = 0; i < indexes[0]; i++) {
319 slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);
323 slot->type = simple_strtoul(type, NULL, 10);
325 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
326 indexes[i + 1], name, type);
328 retval = rpaphp_enable_slot(slot);
330 retval = rpaphp_register_slot(slot);
333 dealloc_slot_struct(slot);
335 name += strlen(name) + 1;
336 type += strlen(type) + 1;
338 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
340 /* XXX FIXME: reports a failure only if last entry in loop failed */
344 static void __exit cleanup_slots(void)
346 struct list_head *tmp, *n;
350 * Unregister all of our slots with the pci_hotplug subsystem,
351 * and free up all memory that we had allocated.
352 * memory will be freed in release_slot callback.
355 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
356 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
357 list_del(&slot->rpaphp_slot_list);
358 pci_hp_deregister(slot->hotplug_slot);
363 static int __init rpaphp_init(void)
365 struct device_node *dn = NULL;
367 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
369 while ((dn = of_find_node_by_name(dn, "pci")))
375 static void __exit rpaphp_exit(void)
380 static int enable_slot(struct hotplug_slot *hotplug_slot)
382 struct slot *slot = (struct slot *)hotplug_slot->private;
386 if (slot->state == CONFIGURED)
389 retval = rpaphp_get_sensor_state(slot, &state);
393 if (state == PRESENT) {
394 pcibios_add_pci_devices(slot->bus);
395 slot->state = CONFIGURED;
396 } else if (state == EMPTY) {
399 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, slot->name);
400 slot->state = NOT_VALID;
406 static int disable_slot(struct hotplug_slot *hotplug_slot)
408 struct slot *slot = (struct slot *)hotplug_slot->private;
409 if (slot->state == NOT_CONFIGURED)
412 pcibios_remove_pci_devices(slot->bus);
413 slot->state = NOT_CONFIGURED;
417 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
418 .owner = THIS_MODULE,
419 .enable_slot = enable_slot,
420 .disable_slot = disable_slot,
421 .set_attention_status = set_attention_status,
422 .get_power_status = get_power_status,
423 .get_attention_status = get_attention_status,
424 .get_adapter_status = get_adapter_status,
425 .get_max_bus_speed = get_max_bus_speed,
428 module_init(rpaphp_init);
429 module_exit(rpaphp_exit);
431 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
432 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
433 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);