1 /* 2 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. 3 * Copyright (C) 2003 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/pci.h> 26 #include <linux/string.h> 27 28 #include <asm/pci-bridge.h> 29 #include <asm/rtas.h> 30 #include <asm/machdep.h> 31 32 #include "../pci.h" /* for pci_add_new_bus */ 33 #include "rpaphp.h" 34 35 int rpaphp_get_sensor_state(struct slot *slot, int *state) 36 { 37 int rc; 38 int setlevel; 39 40 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state); 41 42 if (rc < 0) { 43 if (rc == -EFAULT || rc == -EEXIST) { 44 dbg("%s: slot must be power up to get sensor-state\n", 45 __func__); 46 47 /* some slots have to be powered up 48 * before get-sensor will succeed. 49 */ 50 rc = rtas_set_power_level(slot->power_domain, POWER_ON, 51 &setlevel); 52 if (rc < 0) { 53 dbg("%s: power on slot[%s] failed rc=%d.\n", 54 __func__, slot->name, rc); 55 } else { 56 rc = rtas_get_sensor(DR_ENTITY_SENSE, 57 slot->index, state); 58 } 59 } else if (rc == -ENODEV) 60 info("%s: slot is unusable\n", __func__); 61 else 62 err("%s failed to get sensor state\n", __func__); 63 } 64 return rc; 65 } 66 67 /** 68 * rpaphp_enable_slot - record slot state, config pci device 69 * @slot: target &slot 70 * 71 * Initialize values in the slot, and the hotplug_slot info 72 * structures to indicate if there is a pci card plugged into 73 * the slot. If the slot is not empty, run the pcibios routine 74 * to get pcibios stuff correctly set up. 75 */ 76 int rpaphp_enable_slot(struct slot *slot) 77 { 78 int rc, level, state; 79 struct pci_bus *bus; 80 struct hotplug_slot_info *info = slot->hotplug_slot->info; 81 82 info->adapter_status = NOT_VALID; 83 slot->state = EMPTY; 84 85 /* Find out if the power is turned on for the slot */ 86 rc = rtas_get_power_level(slot->power_domain, &level); 87 if (rc) 88 return rc; 89 info->power_status = level; 90 91 /* Figure out if there is an adapter in the slot */ 92 rc = rpaphp_get_sensor_state(slot, &state); 93 if (rc) 94 return rc; 95 96 bus = pcibios_find_pci_bus(slot->dn); 97 if (!bus) { 98 err("%s: no pci_bus for dn %s\n", __func__, slot->dn->full_name); 99 return -EINVAL; 100 } 101 102 info->adapter_status = EMPTY; 103 slot->bus = bus; 104 slot->pci_devs = &bus->devices; 105 106 /* if there's an adapter in the slot, go add the pci devices */ 107 if (state == PRESENT) { 108 info->adapter_status = NOT_CONFIGURED; 109 slot->state = NOT_CONFIGURED; 110 111 /* non-empty slot has to have child */ 112 if (!slot->dn->child) { 113 err("%s: slot[%s]'s device_node doesn't have child for adapter\n", 114 __func__, slot->name); 115 return -EINVAL; 116 } 117 118 if (list_empty(&bus->devices)) 119 pcibios_add_pci_devices(bus); 120 121 if (!list_empty(&bus->devices)) { 122 info->adapter_status = CONFIGURED; 123 slot->state = CONFIGURED; 124 } 125 126 if (rpaphp_debug) { 127 struct pci_dev *dev; 128 dbg("%s: pci_devs of slot[%s]\n", __func__, slot->dn->full_name); 129 list_for_each_entry (dev, &bus->devices, bus_list) 130 dbg("\t%s\n", pci_name(dev)); 131 } 132 } 133 134 return 0; 135 } 136