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);
57 static int rpaphp_get_attention_status(struct slot *slot)
59 return slot->hotplug_slot->info->attention_status;
63 * set_attention_status - set attention LED
64 * echo 0 > attention -- set LED OFF
65 * echo 1 > attention -- set LED ON
66 * echo 2 > attention -- set LED ID(identify, light is blinking)
69 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
72 struct slot *slot = (struct slot *)hotplug_slot->private;
77 retval = rpaphp_set_attention_status(slot, LED_OFF);
78 hotplug_slot->info->attention_status = 0;
82 retval = rpaphp_set_attention_status(slot, LED_ON);
83 hotplug_slot->info->attention_status = 1;
86 retval = rpaphp_set_attention_status(slot, LED_ID);
87 hotplug_slot->info->attention_status = 2;
95 * get_power_status - get power status of a slot
96 * @hotplug_slot: slot to get status
97 * @value: pointer to store status
101 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
104 struct slot *slot = (struct slot *)hotplug_slot->private;
107 retval = rtas_get_power_level (slot->power_domain, &level);
115 * get_attention_status - get attention LED status
119 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
122 struct slot *slot = (struct slot *)hotplug_slot->private;
125 *value = rpaphp_get_attention_status(slot);
130 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
132 struct slot *slot = (struct slot *)hotplug_slot->private;
136 rc = rpaphp_get_sensor_state(slot, &state);
145 else if (state == PRESENT)
146 *value = slot->state;
151 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
153 struct slot *slot = (struct slot *)hotplug_slot->private;
156 switch (slot->type) {
163 *value = PCI_SPEED_33MHz; /* speed for case 1-6 */
167 *value = PCI_SPEED_66MHz;
171 *value = PCI_SPEED_66MHz_PCIX;
175 *value = PCI_SPEED_100MHz_PCIX;
179 *value = PCI_SPEED_133MHz_PCIX;
182 *value = PCI_SPEED_UNKNOWN;
190 static int get_children_props(struct device_node *dn, const int **drc_indexes,
191 const int **drc_names, const int **drc_types,
192 const int **drc_power_domains)
194 const int *indexes, *names, *types, *domains;
196 indexes = get_property(dn, "ibm,drc-indexes", NULL);
197 names = get_property(dn, "ibm,drc-names", NULL);
198 types = get_property(dn, "ibm,drc-types", NULL);
199 domains = get_property(dn, "ibm,drc-power-domains", NULL);
201 if (!indexes || !names || !types || !domains) {
202 /* Slot does not have dynamically-removable children */
206 *drc_indexes = indexes;
208 /* &drc_names[1] contains NULL terminated slot names */
211 /* &drc_types[1] contains NULL terminated slot types */
213 if (drc_power_domains)
214 *drc_power_domains = domains;
219 /* To get the DRC props describing the current node, first obtain it's
220 * my-drc-index property. Next obtain the DRC list from it's parent. Use
221 * the my-drc-index for correlation, and obtain the requested properties.
223 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
224 char **drc_name, char **drc_type, int *drc_power_domain)
226 const int *indexes, *names;
227 const int *types, *domains;
228 const unsigned int *my_index;
229 char *name_tmp, *type_tmp;
232 my_index = get_property(dn, "ibm,my-drc-index", NULL);
234 /* Node isn't DLPAR/hotplug capable */
238 rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
243 name_tmp = (char *) &names[1];
244 type_tmp = (char *) &types[1];
246 /* Iterate through parent properties, looking for my-drc-index */
247 for (i = 0; i < indexes[0]; i++) {
248 if ((unsigned int) indexes[i + 1] == *my_index) {
250 *drc_name = name_tmp;
252 *drc_type = type_tmp;
254 *drc_index = *my_index;
255 if (drc_power_domain)
256 *drc_power_domain = domains[i+1];
259 name_tmp += (strlen(name_tmp) + 1);
260 type_tmp += (strlen(type_tmp) + 1);
266 static int is_php_type(char *drc_type)
271 /* PCI Hotplug nodes have an integer for drc_type */
272 value = simple_strtoul(drc_type, &endptr, 10);
273 if (endptr == drc_type)
279 static int is_php_dn(struct device_node *dn, const int **indexes,
280 const int **names, const int **types, const int **power_domains)
282 const int *drc_types;
285 rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
287 if (is_php_type((char *) &drc_types[1])) {
297 * rpaphp_add_slot -- add hotplug or dlpar slot
299 * rpaphp not only registers PCI hotplug slots(HOTPLUG),
300 * but also logical DR slots(EMBEDDED).
301 * HOTPLUG slot: An adapter can be physically added/removed.
302 * EMBEDDED slot: An adapter can be logically removed/added
303 * from/to a partition with the slot.
305 int rpaphp_add_slot(struct device_node *dn)
310 const int *indexes, *names, *types, *power_domains;
313 if (!dn->name || strcmp(dn->name, "pci"))
316 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
319 dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name);
321 /* register PCI devices */
322 name = (char *) &names[1];
323 type = (char *) &types[1];
324 for (i = 0; i < indexes[0]; i++) {
326 slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);
330 slot->type = simple_strtoul(type, NULL, 10);
332 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
333 indexes[i + 1], name, type);
335 retval = rpaphp_register_pci_slot(slot);
337 dealloc_slot_struct(slot);
339 name += strlen(name) + 1;
340 type += strlen(type) + 1;
342 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
344 /* XXX FIXME: reports a failure only if last entry in loop failed */
348 static void __exit cleanup_slots(void)
350 struct list_head *tmp, *n;
354 * Unregister all of our slots with the pci_hotplug subsystem,
355 * and free up all memory that we had allocated.
356 * memory will be freed in release_slot callback.
359 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
360 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
361 list_del(&slot->rpaphp_slot_list);
362 pci_hp_deregister(slot->hotplug_slot);
367 static int __init rpaphp_init(void)
369 struct device_node *dn = NULL;
371 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
372 init_MUTEX(&rpaphp_sem);
374 while ((dn = of_find_node_by_name(dn, "pci")))
380 static void __exit rpaphp_exit(void)
385 static int __enable_slot(struct slot *slot)
390 if (slot->state == CONFIGURED)
393 retval = rpaphp_get_sensor_state(slot, &state);
397 if (state == PRESENT) {
398 pcibios_add_pci_devices(slot->bus);
399 slot->state = CONFIGURED;
400 } else if (state == EMPTY) {
403 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, slot->name);
404 slot->state = NOT_VALID;
410 static int enable_slot(struct hotplug_slot *hotplug_slot)
413 struct slot *slot = (struct slot *)hotplug_slot->private;
416 retval = __enable_slot(slot);
422 static int __disable_slot(struct slot *slot)
424 struct pci_dev *dev, *tmp;
426 if (slot->state == NOT_CONFIGURED)
429 list_for_each_entry_safe(dev, tmp, &slot->bus->devices, bus_list) {
430 eeh_remove_bus_device(dev);
431 pci_remove_bus_device(dev);
434 slot->state = NOT_CONFIGURED;
438 static int disable_slot(struct hotplug_slot *hotplug_slot)
440 struct slot *slot = (struct slot *)hotplug_slot->private;
444 retval = __disable_slot (slot);
450 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
451 .owner = THIS_MODULE,
452 .enable_slot = enable_slot,
453 .disable_slot = disable_slot,
454 .set_attention_status = set_attention_status,
455 .get_power_status = get_power_status,
456 .get_attention_status = get_attention_status,
457 .get_adapter_status = get_adapter_status,
458 .get_max_bus_speed = get_max_bus_speed,
461 module_init(rpaphp_init);
462 module_exit(rpaphp_exit);
464 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
465 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
466 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);