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 retval = rpaphp_get_pci_adapter_status(slot, 0, value);
141 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
143 struct slot *slot = (struct slot *)hotplug_slot->private;
146 switch (slot->type) {
153 *value = PCI_SPEED_33MHz; /* speed for case 1-6 */
157 *value = PCI_SPEED_66MHz;
161 *value = PCI_SPEED_66MHz_PCIX;
165 *value = PCI_SPEED_100MHz_PCIX;
169 *value = PCI_SPEED_133MHz_PCIX;
172 *value = PCI_SPEED_UNKNOWN;
180 static int get_children_props(struct device_node *dn, const int **drc_indexes,
181 const int **drc_names, const int **drc_types,
182 const int **drc_power_domains)
184 const int *indexes, *names, *types, *domains;
186 indexes = get_property(dn, "ibm,drc-indexes", NULL);
187 names = get_property(dn, "ibm,drc-names", NULL);
188 types = get_property(dn, "ibm,drc-types", NULL);
189 domains = get_property(dn, "ibm,drc-power-domains", NULL);
191 if (!indexes || !names || !types || !domains) {
192 /* Slot does not have dynamically-removable children */
196 *drc_indexes = indexes;
198 /* &drc_names[1] contains NULL terminated slot names */
201 /* &drc_types[1] contains NULL terminated slot types */
203 if (drc_power_domains)
204 *drc_power_domains = domains;
209 /* To get the DRC props describing the current node, first obtain it's
210 * my-drc-index property. Next obtain the DRC list from it's parent. Use
211 * the my-drc-index for correlation, and obtain the requested properties.
213 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
214 char **drc_name, char **drc_type, int *drc_power_domain)
216 const int *indexes, *names;
217 const int *types, *domains;
218 const unsigned int *my_index;
219 char *name_tmp, *type_tmp;
222 my_index = get_property(dn, "ibm,my-drc-index", NULL);
224 /* Node isn't DLPAR/hotplug capable */
228 rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
233 name_tmp = (char *) &names[1];
234 type_tmp = (char *) &types[1];
236 /* Iterate through parent properties, looking for my-drc-index */
237 for (i = 0; i < indexes[0]; i++) {
238 if ((unsigned int) indexes[i + 1] == *my_index) {
240 *drc_name = name_tmp;
242 *drc_type = type_tmp;
244 *drc_index = *my_index;
245 if (drc_power_domain)
246 *drc_power_domain = domains[i+1];
249 name_tmp += (strlen(name_tmp) + 1);
250 type_tmp += (strlen(type_tmp) + 1);
256 static int is_php_type(char *drc_type)
261 /* PCI Hotplug nodes have an integer for drc_type */
262 value = simple_strtoul(drc_type, &endptr, 10);
263 if (endptr == drc_type)
269 static int is_php_dn(struct device_node *dn, const int **indexes,
270 const int **names, const int **types, const int **power_domains)
272 const int *drc_types;
275 rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
277 if (is_php_type((char *) &drc_types[1])) {
287 * rpaphp_add_slot -- add hotplug or dlpar slot
289 * rpaphp not only registers PCI hotplug slots(HOTPLUG),
290 * but also logical DR slots(EMBEDDED).
291 * HOTPLUG slot: An adapter can be physically added/removed.
292 * EMBEDDED slot: An adapter can be logically removed/added
293 * from/to a partition with the slot.
295 int rpaphp_add_slot(struct device_node *dn)
300 const int *indexes, *names, *types, *power_domains;
303 if (!dn->name || strcmp(dn->name, "pci"))
306 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
309 dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name);
311 /* register PCI devices */
312 name = (char *) &names[1];
313 type = (char *) &types[1];
314 for (i = 0; i < indexes[0]; i++) {
316 slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);
320 slot->type = simple_strtoul(type, NULL, 10);
322 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
323 indexes[i + 1], name, type);
325 retval = rpaphp_register_pci_slot(slot);
327 dealloc_slot_struct(slot);
329 name += strlen(name) + 1;
330 type += strlen(type) + 1;
332 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
334 /* XXX FIXME: reports a failure only if last entry in loop failed */
338 static void __exit cleanup_slots(void)
340 struct list_head *tmp, *n;
344 * Unregister all of our slots with the pci_hotplug subsystem,
345 * and free up all memory that we had allocated.
346 * memory will be freed in release_slot callback.
349 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
350 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
351 list_del(&slot->rpaphp_slot_list);
352 pci_hp_deregister(slot->hotplug_slot);
357 static int __init rpaphp_init(void)
359 struct device_node *dn = NULL;
361 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
362 init_MUTEX(&rpaphp_sem);
364 while ((dn = of_find_node_by_name(dn, "pci")))
370 static void __exit rpaphp_exit(void)
375 static int __enable_slot(struct slot *slot)
380 if (slot->state == CONFIGURED)
383 retval = rpaphp_get_sensor_state(slot, &state);
387 if (state == PRESENT) {
388 pcibios_add_pci_devices(slot->bus);
389 slot->state = CONFIGURED;
390 } else if (state == EMPTY) {
393 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, slot->name);
394 slot->state = NOT_VALID;
400 static int enable_slot(struct hotplug_slot *hotplug_slot)
403 struct slot *slot = (struct slot *)hotplug_slot->private;
406 retval = __enable_slot(slot);
412 static int __disable_slot(struct slot *slot)
414 struct pci_dev *dev, *tmp;
416 if (slot->state == NOT_CONFIGURED)
419 list_for_each_entry_safe(dev, tmp, &slot->bus->devices, bus_list) {
420 eeh_remove_bus_device(dev);
421 pci_remove_bus_device(dev);
424 slot->state = NOT_CONFIGURED;
428 static int disable_slot(struct hotplug_slot *hotplug_slot)
430 struct slot *slot = (struct slot *)hotplug_slot->private;
434 retval = __disable_slot (slot);
440 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
441 .owner = THIS_MODULE,
442 .enable_slot = enable_slot,
443 .disable_slot = disable_slot,
444 .set_attention_status = set_attention_status,
445 .get_power_status = get_power_status,
446 .get_attention_status = get_attention_status,
447 .get_adapter_status = get_adapter_status,
448 .get_max_bus_speed = get_max_bus_speed,
451 module_init(rpaphp_init);
452 module_exit(rpaphp_exit);
454 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
455 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
456 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);