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 } 227