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