/* * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. * Copyright (C) 2003 Linda Xie * * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Send feedback to * */ #include #include #include #include #include #include "../pci.h" /* for pci_add_new_bus */ #include "rpaphp.h" static int rpaphp_get_sensor_state(struct slot *slot, int *state) { int rc; int setlevel; rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state); if (rc < 0) { if (rc == -EFAULT || rc == -EEXIST) { dbg("%s: slot must be power up to get sensor-state\n", __FUNCTION__); /* some slots have to be powered up * before get-sensor will succeed. */ rc = rtas_set_power_level(slot->power_domain, POWER_ON, &setlevel); if (rc < 0) { dbg("%s: power on slot[%s] failed rc=%d.\n", __FUNCTION__, slot->name, rc); } else { rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state); } } else if (rc == -ENODEV) info("%s: slot is unusable\n", __FUNCTION__); else err("%s failed to get sensor state\n", __FUNCTION__); } return rc; } /** * get_pci_adapter_status - get the status of a slot * * 0-- slot is empty * 1-- adapter is configured * 2-- adapter is not configured * 3-- not valid */ int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value) { struct pci_bus *bus; int state, rc; *value = NOT_VALID; rc = rpaphp_get_sensor_state(slot, &state); if (rc) goto exit; if (state == EMPTY) *value = EMPTY; else if (state == PRESENT) { if (!is_init) { /* at run-time slot->state can be changed by */ /* config/unconfig adapter */ *value = slot->state; } else { bus = pcibios_find_pci_bus(slot->dn); if (bus && !list_empty(&bus->devices)) *value = CONFIGURED; else *value = NOT_CONFIGURED; } } exit: return rc; } static void print_slot_pci_funcs(struct pci_bus *bus) { struct device_node *dn; struct pci_dev *dev; dn = pci_bus_to_OF_node(bus); if (!dn) return; dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name); list_for_each_entry (dev, &bus->devices, bus_list) dbg("\t%s\n", pci_name(dev)); return; } static int setup_pci_hotplug_slot_info(struct slot *slot) { struct hotplug_slot_info *hotplug_slot_info = slot->hotplug_slot->info; dbg("%s Initilize the PCI slot's hotplug->info structure ...\n", __FUNCTION__); rpaphp_get_power_status(slot, &hotplug_slot_info->power_status); rpaphp_get_pci_adapter_status(slot, 1, &hotplug_slot_info->adapter_status); if (hotplug_slot_info->adapter_status == NOT_VALID) { err("%s: NOT_VALID: skip dn->full_name=%s\n", __FUNCTION__, slot->dn->full_name); return -EINVAL; } return 0; } static void set_slot_name(struct slot *slot) { struct pci_bus *bus = slot->bus; struct pci_dev *bridge; bridge = bus->self; if (bridge) strcpy(slot->name, pci_name(bridge)); else sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus), bus->number); } static int setup_pci_slot(struct slot *slot) { struct device_node *dn = slot->dn; struct pci_bus *bus; BUG_ON(!dn); bus = pcibios_find_pci_bus(dn); if (!bus) { err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name); goto exit_rc; } slot->bus = bus; slot->pci_devs = &bus->devices; set_slot_name(slot); /* find slot's pci_dev if it's not empty */ if (slot->hotplug_slot->info->adapter_status == EMPTY) { slot->state = EMPTY; /* slot is empty */ } else { /* slot is occupied */ if (!dn->child) { /* non-empty slot has to have child */ err("%s: slot[%s]'s device_node doesn't have child for adapter\n", __FUNCTION__, slot->name); goto exit_rc; } if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) { dbg("%s CONFIGURING pci adapter in slot[%s]\n", __FUNCTION__, slot->name); pcibios_add_pci_devices(slot->bus); } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) { err("%s: slot[%s]'s adapter_status is NOT_VALID.\n", __FUNCTION__, slot->name); goto exit_rc; } print_slot_pci_funcs(slot->bus); if (!list_empty(slot->pci_devs)) { slot->state = CONFIGURED; } else { /* DLPAR add as opposed to * boot time */ slot->state = NOT_CONFIGURED; } } return 0; exit_rc: dealloc_slot_struct(slot); return -EINVAL; } int register_pci_slot(struct slot *slot) { int rc = -EINVAL; if (setup_pci_hotplug_slot_info(slot)) goto exit_rc; if (setup_pci_slot(slot)) goto exit_rc; rc = register_slot(slot); exit_rc: return rc; } int rpaphp_enable_pci_slot(struct slot *slot) { int retval = 0, state; retval = rpaphp_get_sensor_state(slot, &state); if (retval) goto exit; dbg("%s: sensor state[%d]\n", __FUNCTION__, state); /* if slot is not empty, enable the adapter */ if (state == PRESENT) { dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name); pcibios_add_pci_devices(slot->bus); slot->state = CONFIGURED; info("%s: devices in slot[%s] configured\n", __FUNCTION__, slot->name); } else if (state == EMPTY) { dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name); slot->state = EMPTY; } else { err("%s: slot[%s] is in invalid state\n", __FUNCTION__, slot->name); slot->state = NOT_VALID; retval = -EINVAL; } exit: dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); return retval; }