1 // SPDX-License-Identifier: GPL-2.0+
3 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
4 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
8 * Send feedback to <lxie@us.ibm.com>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/pci.h>
15 #include <linux/pci_hotplug.h>
16 #include <linux/smp.h>
17 #include <linux/init.h>
18 #include <linux/vmalloc.h>
19 #include <asm/firmware.h>
20 #include <asm/eeh.h> /* for eeh_add_device() */
21 #include <asm/rtas.h> /* rtas_call */
22 #include <asm/pci-bridge.h> /* for pci_controller */
23 #include "../pci.h" /* for pci_add_new_bus */
24 /* and pci_do_scan_bus */
28 LIST_HEAD(rpaphp_slot_head);
29 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
31 #define DRIVER_VERSION "0.1"
32 #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
33 #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"
35 #define MAX_LOC_CODE 128
37 MODULE_AUTHOR(DRIVER_AUTHOR);
38 MODULE_DESCRIPTION(DRIVER_DESC);
39 MODULE_LICENSE("GPL");
41 module_param_named(debug, rpaphp_debug, bool, 0644);
44 * set_attention_status - set attention LED
45 * @hotplug_slot: target &hotplug_slot
46 * @value: LED control value
48 * echo 0 > attention -- set LED OFF
49 * echo 1 > attention -- set LED ON
50 * echo 2 > attention -- set LED ID(identify, light is blinking)
52 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
55 struct slot *slot = (struct slot *)hotplug_slot->private;
67 rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
69 hotplug_slot->info->attention_status = value;
75 * get_power_status - get power status of a slot
76 * @hotplug_slot: slot to get status
77 * @value: pointer to store status
79 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
82 struct slot *slot = (struct slot *)hotplug_slot->private;
84 retval = rtas_get_power_level(slot->power_domain, &level);
91 * get_attention_status - get attention LED status
92 * @hotplug_slot: slot to get status
93 * @value: pointer to store status
95 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
97 struct slot *slot = (struct slot *)hotplug_slot->private;
98 *value = slot->hotplug_slot->info->attention_status;
102 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
104 struct slot *slot = (struct slot *)hotplug_slot->private;
107 rc = rpaphp_get_sensor_state(slot, &state);
115 else if (state == PRESENT)
116 *value = slot->state;
121 static enum pci_bus_speed get_max_bus_speed(struct slot *slot)
123 enum pci_bus_speed speed;
124 switch (slot->type) {
131 speed = PCI_SPEED_33MHz; /* speed for case 1-6 */
135 speed = PCI_SPEED_66MHz;
139 speed = PCI_SPEED_66MHz_PCIX;
143 speed = PCI_SPEED_100MHz_PCIX;
147 speed = PCI_SPEED_133MHz_PCIX;
150 speed = PCI_SPEED_UNKNOWN;
157 static int get_children_props(struct device_node *dn, const int **drc_indexes,
158 const int **drc_names, const int **drc_types,
159 const int **drc_power_domains)
161 const int *indexes, *names, *types, *domains;
163 indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
164 names = of_get_property(dn, "ibm,drc-names", NULL);
165 types = of_get_property(dn, "ibm,drc-types", NULL);
166 domains = of_get_property(dn, "ibm,drc-power-domains", NULL);
168 if (!indexes || !names || !types || !domains) {
169 /* Slot does not have dynamically-removable children */
173 *drc_indexes = indexes;
175 /* &drc_names[1] contains NULL terminated slot names */
178 /* &drc_types[1] contains NULL terminated slot types */
180 if (drc_power_domains)
181 *drc_power_domains = domains;
187 /* Verify the existence of 'drc_name' and/or 'drc_type' within the
188 * current node. First obtain it's my-drc-index property. Next,
189 * obtain the DRC info from it's parent. Use the my-drc-index for
190 * correlation, and obtain/validate the requested properties.
193 static int rpaphp_check_drc_props_v1(struct device_node *dn, char *drc_name,
194 char *drc_type, unsigned int my_index)
196 char *name_tmp, *type_tmp;
197 const int *indexes, *names;
198 const int *types, *domains;
201 rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
206 name_tmp = (char *) &names[1];
207 type_tmp = (char *) &types[1];
209 /* Iterate through parent properties, looking for my-drc-index */
210 for (i = 0; i < be32_to_cpu(indexes[0]); i++) {
211 if ((unsigned int) indexes[i + 1] == my_index)
214 name_tmp += (strlen(name_tmp) + 1);
215 type_tmp += (strlen(type_tmp) + 1);
218 if (((drc_name == NULL) || (drc_name && !strcmp(drc_name, name_tmp))) &&
219 ((drc_type == NULL) || (drc_type && !strcmp(drc_type, type_tmp))))
225 static int rpaphp_check_drc_props_v2(struct device_node *dn, char *drc_name,
226 char *drc_type, unsigned int my_index)
228 struct property *info;
229 unsigned int entries;
230 struct of_drc_info drc;
232 char cell_drc_name[MAX_DRC_NAME_LEN];
235 info = of_find_property(dn->parent, "ibm,drc-info", NULL);
239 value = of_prop_next_u32(info, NULL, &entries);
243 for (j = 0; j < entries; j++) {
244 of_read_drc_info_cell(&info, &value, &drc);
246 /* Should now know end of current entry */
248 if (my_index > drc.last_drc_index)
257 sprintf(cell_drc_name, "%s%d", drc.drc_name_prefix,
260 if (((drc_name == NULL) ||
261 (drc_name && !strcmp(drc_name, cell_drc_name))) &&
262 ((drc_type == NULL) ||
263 (drc_type && !strcmp(drc_type, drc.drc_type))))
269 int rpaphp_check_drc_props(struct device_node *dn, char *drc_name,
272 const unsigned int *my_index;
274 my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
276 /* Node isn't DLPAR/hotplug capable */
280 if (firmware_has_feature(FW_FEATURE_DRC_INFO))
281 return rpaphp_check_drc_props_v2(dn, drc_name, drc_type,
284 return rpaphp_check_drc_props_v1(dn, drc_name, drc_type,
287 EXPORT_SYMBOL_GPL(rpaphp_check_drc_props);
290 static int is_php_type(char *drc_type)
295 /* PCI Hotplug nodes have an integer for drc_type */
296 value = simple_strtoul(drc_type, &endptr, 10);
297 if (endptr == drc_type)
304 * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
305 * @dn: target &device_node
306 * @indexes: passed to get_children_props()
307 * @names: passed to get_children_props()
308 * @types: returned from get_children_props()
311 * This routine will return true only if the device node is
312 * a hotpluggable slot. This routine will return false
313 * for built-in pci slots (even when the built-in slots are
316 static int is_php_dn(struct device_node *dn, const int **indexes,
317 const int **names, const int **types, const int **power_domains)
319 const int *drc_types;
322 rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
326 if (!is_php_type((char *) &drc_types[1]))
334 * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
335 * @dn: device node of slot
337 * This subroutine will register a hotpluggable slot with the
338 * PCI hotplug infrastructure. This routine is typically called
339 * during boot time, if the hotplug slots are present at boot time,
340 * or is called later, by the dlpar add code, if the slot is
341 * being dynamically added during runtime.
343 * If the device node points at an embedded (built-in) slot, this
344 * routine will just return without doing anything, since embedded
345 * slots cannot be hotplugged.
347 * To remove a slot, it suffices to call rpaphp_deregister_slot().
349 int rpaphp_add_slot(struct device_node *dn)
354 const int *indexes, *names, *types, *power_domains;
357 if (!dn->name || strcmp(dn->name, "pci"))
360 /* If this is not a hotplug slot, return without doing anything. */
361 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
364 dbg("Entry %s: dn=%pOF\n", __func__, dn);
366 /* register PCI devices */
367 name = (char *) &names[1];
368 type = (char *) &types[1];
369 for (i = 0; i < be32_to_cpu(indexes[0]); i++) {
372 index = be32_to_cpu(indexes[i + 1]);
373 slot = alloc_slot_struct(dn, index, name,
374 be32_to_cpu(power_domains[i + 1]));
378 slot->type = simple_strtoul(type, NULL, 10);
380 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
383 retval = rpaphp_enable_slot(slot);
385 retval = rpaphp_register_slot(slot);
388 dealloc_slot_struct(slot);
390 name += strlen(name) + 1;
391 type += strlen(type) + 1;
393 dbg("%s - Exit: rc[%d]\n", __func__, retval);
395 /* XXX FIXME: reports a failure only if last entry in loop failed */
398 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
400 static void __exit cleanup_slots(void)
402 struct slot *slot, *next;
405 * Unregister all of our slots with the pci_hotplug subsystem,
406 * and free up all memory that we had allocated.
407 * memory will be freed in release_slot callback.
410 list_for_each_entry_safe(slot, next, &rpaphp_slot_head,
412 list_del(&slot->rpaphp_slot_list);
413 pci_hp_deregister(slot->hotplug_slot);
418 static int __init rpaphp_init(void)
420 struct device_node *dn;
422 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
424 for_each_node_by_name(dn, "pci")
430 static void __exit rpaphp_exit(void)
435 static int enable_slot(struct hotplug_slot *hotplug_slot)
437 struct slot *slot = (struct slot *)hotplug_slot->private;
441 if (slot->state == CONFIGURED)
444 retval = rpaphp_get_sensor_state(slot, &state);
448 if (state == PRESENT) {
449 pci_lock_rescan_remove();
450 pci_hp_add_devices(slot->bus);
451 pci_unlock_rescan_remove();
452 slot->state = CONFIGURED;
453 } else if (state == EMPTY) {
456 err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
457 slot->state = NOT_VALID;
461 slot->bus->max_bus_speed = get_max_bus_speed(slot);
465 static int disable_slot(struct hotplug_slot *hotplug_slot)
467 struct slot *slot = (struct slot *)hotplug_slot->private;
468 if (slot->state == NOT_CONFIGURED)
471 pci_lock_rescan_remove();
472 pci_hp_remove_devices(slot->bus);
473 pci_unlock_rescan_remove();
476 slot->state = NOT_CONFIGURED;
480 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
481 .enable_slot = enable_slot,
482 .disable_slot = disable_slot,
483 .set_attention_status = set_attention_status,
484 .get_power_status = get_power_status,
485 .get_attention_status = get_attention_status,
486 .get_adapter_status = get_adapter_status,
489 module_init(rpaphp_init);
490 module_exit(rpaphp_exit);