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 } 268