Orange Pi5 kernel

// 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/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;
}