diff options
Diffstat (limited to 'drivers/pci/hotplug/rpaphp_pci.c')
| -rw-r--r-- | drivers/pci/hotplug/rpaphp_pci.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/rpaphp_pci.c b/drivers/pci/hotplug/rpaphp_pci.c new file mode 100644 index 000000000..9243f3e7a --- /dev/null +++ b/drivers/pci/hotplug/rpaphp_pci.c @@ -0,0 +1,135 @@ +/* + * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. + * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> + * + * 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 <lxie@us.ibm.com> + * + */ +#include <linux/pci.h> +#include <linux/string.h> + +#include <asm/pci-bridge.h> +#include <asm/rtas.h> +#include <asm/machdep.h> + +#include "../pci.h" /* for pci_add_new_bus */ +#include "rpaphp.h" + +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", + __func__); + + /* 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", + __func__, slot->name, rc); + } else { + rc = rtas_get_sensor(DR_ENTITY_SENSE, + slot->index, state); + } + } else if (rc == -ENODEV) + info("%s: slot is unusable\n", __func__); + else + err("%s failed to get sensor state\n", __func__); + } + return rc; +} + +/** + * rpaphp_enable_slot - record slot state, config pci device + * @slot: target &slot + * + * Initialize values in the slot, and the hotplug_slot info + * structures to indicate if there is a pci card plugged into + * the slot. If the slot is not empty, run the pcibios routine + * to get pcibios stuff correctly set up. + */ +int rpaphp_enable_slot(struct slot *slot) +{ + int rc, level, state; + struct pci_bus *bus; + struct hotplug_slot_info *info = slot->hotplug_slot->info; + + info->adapter_status = NOT_VALID; + slot->state = EMPTY; + + /* Find out if the power is turned on for the slot */ + rc = rtas_get_power_level(slot->power_domain, &level); + if (rc) + return rc; + info->power_status = level; + + /* Figure out if there is an adapter in the slot */ + rc = rpaphp_get_sensor_state(slot, &state); + if (rc) + return rc; + + bus = pcibios_find_pci_bus(slot->dn); + if (!bus) { + err("%s: no pci_bus for dn %s\n", __func__, slot->dn->full_name); + return -EINVAL; + } + + info->adapter_status = EMPTY; + slot->bus = bus; + slot->pci_devs = &bus->devices; + + /* if there's an adapter in the slot, go add the pci devices */ + if (state == PRESENT) { + info->adapter_status = NOT_CONFIGURED; + slot->state = NOT_CONFIGURED; + + /* non-empty slot has to have child */ + if (!slot->dn->child) { + err("%s: slot[%s]'s device_node doesn't have child for adapter\n", + __func__, slot->name); + return -EINVAL; + } + + if (list_empty(&bus->devices)) + pcibios_add_pci_devices(bus); + + if (!list_empty(&bus->devices)) { + info->adapter_status = CONFIGURED; + slot->state = CONFIGURED; + } + + if (rpaphp_debug) { + struct pci_dev *dev; + dbg("%s: pci_devs of slot[%s]\n", __func__, slot->dn->full_name); + list_for_each_entry (dev, &bus->devices, bus_list) + dbg("\t%s\n", pci_name(dev)); + } + } + + return 0; +} |