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);