drivers/pci/hotplug/rpaphp_slot.c

   1 /*
   2  * RPA Virtual I/O device functions
   3  * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
   4  *
   5  * All rights reserved.
   6  *
   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.
  11  *
  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
  16  * details.
  17  *
  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.
  21  *
  22  * Send feedback to <lxie@us.ibm.com>
  23  *
  24  */
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/kobject.h>
  28 #include <linux/sysfs.h>
  29 #include <linux/pci.h>
  30 #include <asm/rtas.h>
  31 #include "rpaphp.h"
  32
  33 static ssize_t removable_read_file (struct hotplug_slot *php_slot, char *buf)
  34 {
  35         u8 value;
  36         int retval = -ENOENT;
  37         struct slot *slot = (struct slot *)php_slot->private;
  38
  39         if (!slot)
  40                 return retval;
  41
  42         value = slot->removable;
  43         retval = sprintf (buf, "%d\n", value);
  44         return retval;
  45 }
  46
  47 static struct hotplug_slot_attribute hotplug_slot_attr_removable = {
  48         .attr = {.name = "phy_removable", .mode = S_IFREG | S_IRUGO},
  49         .show = removable_read_file,
  50 };
  51
  52 static void rpaphp_sysfs_add_attr_removable (struct hotplug_slot *slot)
  53 {
  54         sysfs_create_file(&slot->kobj, &hotplug_slot_attr_removable.attr);
  55 }
  56
  57 static void rpaphp_sysfs_remove_attr_removable (struct hotplug_slot *slot)
  58 {
  59         sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_removable.attr);
  60 }
  61
  62 static ssize_t location_read_file (struct hotplug_slot *php_slot, char *buf)
  63 {
  64         char *value;
  65         int retval = -ENOENT;
  66         struct slot *slot = (struct slot *)php_slot->private;
  67
  68         if (!slot)
  69                 return retval;
  70
  71         value = slot->location;
  72         retval = sprintf (buf, "%s\n", value);
  73         return retval;
  74 }
  75
  76 static struct hotplug_slot_attribute hotplug_slot_attr_location = {
  77         .attr = {.name = "phy_location", .mode = S_IFREG | S_IRUGO},
  78         .show = location_read_file,
  79 };
  80
  81 static void rpaphp_sysfs_add_attr_location (struct hotplug_slot *slot)
  82 {
  83         sysfs_create_file(&slot->kobj, &hotplug_slot_attr_location.attr);
  84 }
  85
  86 static void rpaphp_sysfs_remove_attr_location (struct hotplug_slot *slot)
  87 {
  88         sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_location.attr);
  89 }
  90
  91 /* free up the memory used by a slot */
  92 static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
  93 {
  94         struct slot *slot = (struct slot *) hotplug_slot->private;
  95
  96         dealloc_slot_struct(slot);
  97 }
  98
  99 void dealloc_slot_struct(struct slot *slot)
 100 {
 101         kfree(slot->hotplug_slot->info);
 102         kfree(slot->hotplug_slot->name);
 103         kfree(slot->hotplug_slot);
 104         kfree(slot);
 105         return;
 106 }
 107
 108 struct slot *alloc_slot_struct(struct device_node *dn, int drc_index, char *drc_name,
 109                   int power_domain)
 110 {
 111         struct slot *slot;
 112
 113         slot = kmalloc(sizeof (struct slot), GFP_KERNEL);
 114         if (!slot)
 115                 goto error_nomem;
 116         memset(slot, 0, sizeof (struct slot));
 117         slot->hotplug_slot = kmalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
 118         if (!slot->hotplug_slot)
 119                 goto error_slot;
 120         memset(slot->hotplug_slot, 0, sizeof (struct hotplug_slot));
 121         slot->hotplug_slot->info = kmalloc(sizeof (struct hotplug_slot_info),
 122                                            GFP_KERNEL);
 123         if (!slot->hotplug_slot->info)
 124                 goto error_hpslot;
 125         memset(slot->hotplug_slot->info, 0, sizeof (struct hotplug_slot_info));
 126         slot->hotplug_slot->name = kmalloc(BUS_ID_SIZE + 1, GFP_KERNEL);
 127         if (!slot->hotplug_slot->name)
 128                 goto error_info;
 129         slot->location = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
 130         if (!slot->location)
 131                 goto error_name;
 132         slot->name = slot->hotplug_slot->name;
 133         slot->dn = dn;
 134         slot->index = drc_index;
 135         strcpy(slot->location, drc_name);
 136         slot->power_domain = power_domain;
 137         slot->hotplug_slot->private = slot;
 138         slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
 139         slot->hotplug_slot->release = &rpaphp_release_slot;
 140
 141         return (slot);
 142
 143 error_name:
 144         kfree(slot->hotplug_slot->name);
 145 error_info:
 146         kfree(slot->hotplug_slot->info);
 147 error_hpslot:
 148         kfree(slot->hotplug_slot);
 149 error_slot:
 150         kfree(slot);
 151 error_nomem:
 152         return NULL;
 153 }
 154
 155 static int is_registered(struct slot *slot)
 156 {
 157         struct slot             *tmp_slot;
 158
 159         list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
 160                 if (!strcmp(tmp_slot->name, slot->name))
 161                         return 1;
 162         }
 163         return 0;
 164 }
 165
 166 int deregister_slot(struct slot *slot)
 167 {
 168         int retval = 0;
 169         struct hotplug_slot *php_slot = slot->hotplug_slot;
 170
 171          dbg("%s - Entry: deregistering slot=%s\n",
 172                 __FUNCTION__, slot->name);
 173
 174         list_del(&slot->rpaphp_slot_list);
 175
 176         /* remove "phy_location" file */
 177         rpaphp_sysfs_remove_attr_location(php_slot);
 178
 179         /* remove "phy_removable" file */
 180         rpaphp_sysfs_remove_attr_removable(php_slot);
 181
 182         retval = pci_hp_deregister(php_slot);
 183         if (retval)
 184                 err("Problem unregistering a slot %s\n", slot->name);
 185         else
 186                 num_slots--;
 187
 188         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 189         return retval;
 190 }
 191
 192 int register_slot(struct slot *slot)
 193 {
 194         int retval;
 195
 196         dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
 197                 __FUNCTION__, slot->dn->full_name, slot->index, slot->name,
 198                 slot->power_domain, slot->type);
 199         /* should not try to register the same slot twice */
 200         if (is_registered(slot)) { /* should't be here */
 201                 err("register_slot: slot[%s] is already registered\n", slot->name);
 202                 rpaphp_release_slot(slot->hotplug_slot);
 203                 return -EAGAIN;
 204         }
 205         retval = pci_hp_register(slot->hotplug_slot);
 206         if (retval) {
 207                 err("pci_hp_register failed with error %d\n", retval);
 208                 rpaphp_release_slot(slot->hotplug_slot);
 209                 return retval;
 210         }
 211
 212         /* create "phy_locatoin" file */
 213         rpaphp_sysfs_add_attr_location(slot->hotplug_slot);
 214
 215         /* create "phy_removable" file */
 216         rpaphp_sysfs_add_attr_removable(slot->hotplug_slot);
 217
 218         /* add slot to our internal list */
 219         dbg("%s adding slot[%s] to rpaphp_slot_list\n",
 220             __FUNCTION__, slot->name);
 221
 222         list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
 223
 224         if (slot->dev_type == VIO_DEV)
 225                 info("Slot [%s](VIO location=%s) registered\n",
 226                      slot->name, slot->location);
 227         else
 228                 info("Slot [%s](PCI location=%s) registered\n",
 229                      slot->name, slot->location);
 230         num_slots++;
 231         return 0;
 232 }
 233
 234 int rpaphp_get_power_status(struct slot *slot, u8 * value)
 235 {
 236         int rc = 0, level;
 237
 238         if (slot->type == HOTPLUG) {
 239                 rc = rtas_get_power_level(slot->power_domain, &level);
 240                 if (!rc) {
 241                         dbg("%s the power level of slot %s(pwd-domain:0x%x) is %d\n",
 242                                 __FUNCTION__, slot->name, slot->power_domain, level);
 243                         *value = level;
 244                 } else
 245                         err("failed to get power-level for slot(%s), rc=0x%x\n",
 246                                 slot->location, rc);
 247         } else {
 248                 dbg("%s report POWER_ON for EMBEDDED or PHB slot %s\n",
 249                         __FUNCTION__, slot->location);
 250                 *value = (u8) POWER_ON;
 251         }
 252
 253         return rc;
 254 }
 255
 256 int rpaphp_set_attention_status(struct slot *slot, u8 status)
 257 {
 258         int rc;
 259
 260         /* status: LED_OFF or LED_ON */
 261         rc = rtas_set_indicator(DR_INDICATOR, slot->index, status);
 262         if (rc < 0)
 263                 err("slot(name=%s location=%s index=0x%x) set attention-status(%d) failed! rc=0x%x\n",
 264                     slot->name, slot->location, slot->index, status, rc);
 265
 266         return rc;
 267 }