// SPDX-License-Identifier: GPL-2.0+
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/*
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* PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
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* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
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*
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* All rights reserved.
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*
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* Send feedback to <lxie@us.ibm.com>
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*
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*/
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#include <linux/pci.h>
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#include <linux/string.h>
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#include <asm/pci-bridge.h>
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#include <asm/rtas.h>
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#include <asm/machdep.h>
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#include "../pci.h" /* for pci_add_new_bus */
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#include "rpaphp.h"
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int rpaphp_get_sensor_state(struct slot *slot, int *state)
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{
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int rc;
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int setlevel;
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rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
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if (rc < 0) {
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if (rc == -EFAULT || rc == -EEXIST) {
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dbg("%s: slot must be power up to get sensor-state\n",
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__func__);
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/* some slots have to be powered up
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* before get-sensor will succeed.
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*/
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rc = rtas_set_power_level(slot->power_domain, POWER_ON,
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&setlevel);
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if (rc < 0) {
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dbg("%s: power on slot[%s] failed rc=%d.\n",
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__func__, slot->name, rc);
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} else {
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rc = rtas_get_sensor(DR_ENTITY_SENSE,
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slot->index, state);
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}
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} else if (rc == -ENODEV)
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info("%s: slot is unusable\n", __func__);
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else
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err("%s failed to get sensor state\n", __func__);
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}
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return rc;
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}
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/**
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* rpaphp_enable_slot - record slot state, config pci device
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* @slot: target &slot
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*
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* Initialize values in the slot structure to indicate if there is a pci card
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* plugged into the slot. If the slot is not empty, run the pcibios routine
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* to get pcibios stuff correctly set up.
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*/
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int rpaphp_enable_slot(struct slot *slot)
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{
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int rc, level, state;
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struct pci_bus *bus;
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slot->state = EMPTY;
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/* Find out if the power is turned on for the slot */
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rc = rtas_get_power_level(slot->power_domain, &level);
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if (rc)
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return rc;
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/* Figure out if there is an adapter in the slot */
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rc = rpaphp_get_sensor_state(slot, &state);
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if (rc)
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return rc;
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bus = pci_find_bus_by_node(slot->dn);
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if (!bus) {
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err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn);
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return -EINVAL;
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}
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slot->bus = bus;
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slot->pci_devs = &bus->devices;
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/* if there's an adapter in the slot, go add the pci devices */
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if (state == PRESENT) {
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slot->state = NOT_CONFIGURED;
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/* non-empty slot has to have child */
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if (!slot->dn->child) {
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err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
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__func__, slot->name);
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return -EINVAL;
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}
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if (list_empty(&bus->devices)) {
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pseries_eeh_init_edev_recursive(PCI_DN(slot->dn));
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pci_hp_add_devices(bus);
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}
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if (!list_empty(&bus->devices)) {
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slot->state = CONFIGURED;
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}
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if (rpaphp_debug) {
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struct pci_dev *dev;
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dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn);
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list_for_each_entry(dev, &bus->devices, bus_list)
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dbg("\t%s\n", pci_name(dev));
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}
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}
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return 0;
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}
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