118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
|
// SPDX-License-Identifier: GPL-2.0+
|
||
|
|
/*
|
||
|
|
* PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
|
||
|
|
* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
|
||
|
|
*
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* Send feedback to <lxie@us.ibm.com>
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
#include <linux/of.h>
|
||
|
|
#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 structure 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;
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
/* Figure out if there is an adapter in the slot */
|
||
|
|
rc = rpaphp_get_sensor_state(slot, &state);
|
||
|
|
if (rc)
|
||
|
|
return rc;
|
||
|
|
|
||
|
|
bus = pci_find_bus_by_node(slot->dn);
|
||
|
|
if (!bus) {
|
||
|
|
err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
slot->bus = bus;
|
||
|
|
slot->pci_devs = &bus->devices;
|
||
|
|
|
||
|
|
/* if there's an adapter in the slot, go add the pci devices */
|
||
|
|
if (state == PRESENT) {
|
||
|
|
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)) {
|
||
|
|
pseries_eeh_init_edev_recursive(PCI_DN(slot->dn));
|
||
|
|
pci_hp_add_devices(bus);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!list_empty(&bus->devices)) {
|
||
|
|
slot->state = CONFIGURED;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (rpaphp_debug) {
|
||
|
|
struct pci_dev *dev;
|
||
|
|
dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn);
|
||
|
|
list_for_each_entry(dev, &bus->devices, bus_list)
|
||
|
|
dbg("\t%s\n", pci_name(dev));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|