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 <linux/string.h>
  31 #include <linux/slab.h>
  32
  33 #include <asm/rtas.h>
  34 #include "rpaphp.h"
  35
  36 static ssize_t location_read_file (struct hotplug_slot *php_slot, char *buf)
  37 {
  38         char *value;
  39         int retval = -ENOENT;
  40         struct slot *slot = (struct slot *)php_slot->private;
  41
  42         if (!slot)
  43                 return retval;
  44
  45         value = slot->location;
  46         retval = sprintf (buf, "%s\n", value);
  47         return retval;
  48 }
  49
  50 static struct hotplug_slot_attribute hotplug_slot_attr_location = {
  51         .attr = {.name = "phy_location", .mode = S_IFREG | S_IRUGO},
  52         .show = location_read_file,
  53 };
  54
  55 static void rpaphp_sysfs_add_attr_location (struct hotplug_slot *slot)
  56 {
  57         sysfs_create_file(&slot->kobj, &hotplug_slot_attr_location.attr);
  58 }
  59
  60 static void rpaphp_sysfs_remove_attr_location (struct hotplug_slot *slot)
  61 {
  62         sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_location.attr);
  63 }
  64
  65 /* free up the memory used by a slot */
  66 static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
  67 {
  68         struct slot *slot = (struct slot *) hotplug_slot->private;
  69
  70         dealloc_slot_struct(slot);
  71 }
  72
  73 void dealloc_slot_struct(struct slot *slot)
  74 {
  75         kfree(slot->hotplug_slot->info);
  76         kfree(slot->hotplug_slot->name);
  77         kfree(slot->hotplug_slot);
  78         kfree(slot);
  79         return;
  80 }
  81
  82 struct slot *alloc_slot_struct(struct device_node *dn, int drc_index, char *drc_name,
  83                   int power_domain)
  84 {
  85         struct slot *slot;
  86
  87         slot = kmalloc(sizeof (struct slot), GFP_KERNEL);
  88         if (!slot)
  89                 goto error_nomem;
  90         memset(slot, 0, sizeof (struct slot));
  91         slot->hotplug_slot = kmalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
  92         if (!slot->hotplug_slot)
  93                 goto error_slot;
  94         memset(slot->hotplug_slot, 0, sizeof (struct hotplug_slot));
  95         slot->hotplug_slot->info = kmalloc(sizeof (struct hotplug_slot_info),
  96                                            GFP_KERNEL);
  97         if (!slot->hotplug_slot->info)
  98                 goto error_hpslot;
  99         memset(slot->hotplug_slot->info, 0, sizeof (struct hotplug_slot_info));
 100         slot->hotplug_slot->name = kmalloc(BUS_ID_SIZE + 1, GFP_KERNEL);
 101         if (!slot->hotplug_slot->name)
 102                 goto error_info;
 103         slot->location = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
 104         if (!slot->location)
 105                 goto error_name;
 106         slot->name = slot->hotplug_slot->name;
 107         slot->dn = dn;
 108         slot->index = drc_index;
 109         strcpy(slot->location, drc_name);
 110         slot->power_domain = power_domain;
 111         slot->hotplug_slot->private = slot;
 112         slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
 113         slot->hotplug_slot->release = &rpaphp_release_slot;
 114
 115         return (slot);
 116
 117 error_name:
 118         kfree(slot->hotplug_slot->name);
 119 error_info:
 120         kfree(slot->hotplug_slot->info);
 121 error_hpslot:
 122         kfree(slot->hotplug_slot);
 123 error_slot:
 124         kfree(slot);
 125 error_nomem:
 126         return NULL;
 127 }
 128
 129 static int is_registered(struct slot *slot)
 130 {
 131         struct slot             *tmp_slot;
 132
 133         list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
 134                 if (!strcmp(tmp_slot->name, slot->name))
 135                         return 1;
 136         }
 137         return 0;
 138 }
 139
 140 int deregister_slot(struct slot *slot)
 141 {
 142         int retval = 0;
 143         struct hotplug_slot *php_slot = slot->hotplug_slot;
 144
 145          dbg("%s - Entry: deregistering slot=%s\n",
 146                 __FUNCTION__, slot->name);
 147
 148         list_del(&slot->rpaphp_slot_list);
 149
 150         /* remove "phy_location" file */
 151         rpaphp_sysfs_remove_attr_location(php_slot);
 152
 153         retval = pci_hp_deregister(php_slot);
 154         if (retval)
 155                 err("Problem unregistering a slot %s\n", slot->name);
 156         else
 157                 num_slots--;
 158
 159         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 160         return retval;
 161 }
 162
 163 int register_slot(struct slot *slot)
 164 {
 165         int retval;
 166
 167         dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
 168                 __FUNCTION__, slot->dn->full_name, slot->index, slot->name,
 169                 slot->power_domain, slot->type);
 170         /* should not try to register the same slot twice */
 171         if (is_registered(slot)) { /* should't be here */
 172                 err("register_slot: slot[%s] is already registered\n", slot->name);
 173                 rpaphp_release_slot(slot->hotplug_slot);
 174                 return -EAGAIN;
 175         }
 176         retval = pci_hp_register(slot->hotplug_slot);
 177         if (retval) {
 178                 err("pci_hp_register failed with error %d\n", retval);
 179                 rpaphp_release_slot(slot->hotplug_slot);
 180                 return retval;
 181         }
 182
 183         /* create "phy_locatoin" file */
 184         rpaphp_sysfs_add_attr_location(slot->hotplug_slot);
 185
 186         /* add slot to our internal list */
 187         dbg("%s adding slot[%s] to rpaphp_slot_list\n",
 188             __FUNCTION__, slot->name);
 189
 190         list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
 191         info("Slot [%s](PCI location=%s) registered\n", slot->name,
 192                         slot->location);
 193         num_slots++;
 194         return 0;
 195 }
 196
 197 int rpaphp_get_power_status(struct slot *slot, u8 * value)
 198 {
 199         int rc = 0, level;
 200
 201         rc = rtas_get_power_level(slot->power_domain, &level);
 202         if (rc < 0) {
 203                 err("failed to get power-level for slot(%s), rc=0x%x\n",
 204                         slot->location, rc);
 205                 return rc;
 206         }
 207
 208         dbg("%s the power level of slot %s(pwd-domain:0x%x) is %d\n",
 209                 __FUNCTION__, slot->name, slot->power_domain, level);
 210         *value = level;
 211
 212         return rc;
 213 }
 214
 215 int rpaphp_set_attention_status(struct slot *slot, u8 status)
 216 {
 217         int rc;
 218
 219         /* status: LED_OFF or LED_ON */
 220         rc = rtas_set_indicator(DR_INDICATOR, slot->index, status);
 221         if (rc < 0)
 222                 err("slot(name=%s location=%s index=0x%x) set attention-status(%d) failed! rc=0x%x\n",
 223                     slot->name, slot->location, slot->index, status, rc);
 224
 225         return rc;
 226 }