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)
266 * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
268 * This routine will return true only if the device node is
269 * a hotpluggable slot. This routine will return false
270 * for built-in pci slots (even when the built-in slots are
273 static int is_php_dn(struct device_node *dn, const int **indexes,
274 const int **names, const int **types, const int **power_domains)
276 const int *drc_types;
279 rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
283 if (!is_php_type((char *) &drc_types[1]))
291 * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
292 * @dn device node of slot
294 * This subroutine will register a hotplugable slot with the
295 * PCI hotplug infrastructure. This routine is typicaly called
296 * during boot time, if the hotplug slots are present at boot time,
297 * or is called later, by the dlpar add code, if the slot is
298 * being dynamically added during runtime.
300 * If the device node points at an embedded (built-in) slot, this
301 * routine will just return without doing anything, since embedded
302 * slots cannot be hotplugged.
304 * To remove a slot, it suffices to call rpaphp_deregister_slot()
306 int rpaphp_add_slot(struct device_node *dn)
311 const int *indexes, *names, *types, *power_domains;
314 if (!dn->name || strcmp(dn->name, "pci"))
317 /* If this is not a hotplug slot, return without doing anything. */
318 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
321 dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name);
323 /* register PCI devices */
324 name = (char *) &names[1];
325 type = (char *) &types[1];
326 for (i = 0; i < indexes[0]; i++) {
328 slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);
332 slot->type = simple_strtoul(type, NULL, 10);
334 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
335 indexes[i + 1], name, type);
337 retval = rpaphp_enable_slot(slot);
339 retval = rpaphp_register_slot(slot);
342 dealloc_slot_struct(slot);
344 name += strlen(name) + 1;
345 type += strlen(type) + 1;
347 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
349 /* XXX FIXME: reports a failure only if last entry in loop failed */
353 static void __exit cleanup_slots(void)
355 struct list_head *tmp, *n;
359 * Unregister all of our slots with the pci_hotplug subsystem,
360 * and free up all memory that we had allocated.
361 * memory will be freed in release_slot callback.
364 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
365 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
366 list_del(&slot->rpaphp_slot_list);
367 pci_hp_deregister(slot->hotplug_slot);
372 static int __init rpaphp_init(void)
374 struct device_node *dn = NULL;
376 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
377 init_MUTEX(&rpaphp_sem);
379 while ((dn = of_find_node_by_name(dn, "pci")))
385 static void __exit rpaphp_exit(void)
390 static int __enable_slot(struct slot *slot)
395 if (slot->state == CONFIGURED)
398 retval = rpaphp_get_sensor_state(slot, &state);
402 if (state == PRESENT) {
403 pcibios_add_pci_devices(slot->bus);
404 slot->state = CONFIGURED;
405 } else if (state == EMPTY) {
408 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, slot->name);
409 slot->state = NOT_VALID;
415 static int enable_slot(struct hotplug_slot *hotplug_slot)
418 struct slot *slot = (struct slot *)hotplug_slot->private;
421 retval = __enable_slot(slot);
427 static int __disable_slot(struct slot *slot)
429 struct pci_dev *dev, *tmp;
431 if (slot->state == NOT_CONFIGURED)
434 list_for_each_entry_safe(dev, tmp, &slot->bus->devices, bus_list) {
435 eeh_remove_bus_device(dev);
436 pci_remove_bus_device(dev);
439 slot->state = NOT_CONFIGURED;
443 static int disable_slot(struct hotplug_slot *hotplug_slot)
445 struct slot *slot = (struct slot *)hotplug_slot->private;
449 retval = __disable_slot (slot);
455 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
456 .owner = THIS_MODULE,
457 .enable_slot = enable_slot,
458 .disable_slot = disable_slot,
459 .set_attention_status = set_attention_status,
460 .get_power_status = get_power_status,
461 .get_attention_status = get_attention_status,
462 .get_adapter_status = get_adapter_status,
463 .get_max_bus_speed = get_max_bus_speed,
466 module_init(rpaphp_init);
467 module_exit(rpaphp_exit);
469 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
470 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
471 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);