Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0+
/*
 * PCI Hot Plug Controller Driver for System z
 *
 * Copyright 2012 IBM Corp.
 *
 * Author(s):
 *   Jan Glauber <jang@linux.vnet.ibm.com>
 */
 
#define KMSG_COMPONENT "zpci"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <asm/pci_debug.h>
#include <asm/sclp.h>
 
#define SLOT_NAME_SIZE	10
 
static int zpci_fn_configured(enum zpci_state state)
{
<------>return state == ZPCI_FN_STATE_CONFIGURED ||
<------>       state == ZPCI_FN_STATE_ONLINE;
}
 
static inline int zdev_configure(struct zpci_dev *zdev)
{
<------>int ret = sclp_pci_configure(zdev->fid);
 
<------>zpci_dbg(3, "conf fid:%x, rc:%d\n", zdev->fid, ret);
<------>if (!ret)
<------><------>zdev->state = ZPCI_FN_STATE_CONFIGURED;
 
<------>return ret;
}
 
static inline int zdev_deconfigure(struct zpci_dev *zdev)
{
<------>int ret = sclp_pci_deconfigure(zdev->fid);
 
<------>zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
<------>if (!ret)
<------><------>zdev->state = ZPCI_FN_STATE_STANDBY;
 
<------>return ret;
}
 
static int enable_slot(struct hotplug_slot *hotplug_slot)
{
<------>struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
<------><------><------><------><------>     hotplug_slot);
<------>struct zpci_bus *zbus = zdev->zbus;
<------>int rc;
 
<------>if (zdev->state != ZPCI_FN_STATE_STANDBY)
<------><------>return -EIO;
 
<------>rc = zdev_configure(zdev);
<------>if (rc)
<------><------>return rc;
 
<------>rc = zpci_enable_device(zdev);
<------>if (rc)
<------><------>goto out_deconfigure;
 
<------>pci_scan_slot(zbus->bus, zdev->devfn);
<------>pci_lock_rescan_remove();
<------>pci_bus_add_devices(zbus->bus);
<------>pci_unlock_rescan_remove();
 
<------>return rc;
 
out_deconfigure:
<------>zdev_deconfigure(zdev);
<------>return rc;
}
 
static int disable_slot(struct hotplug_slot *hotplug_slot)
{
<------>struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
<------><------><------><------><------>     hotplug_slot);
<------>struct pci_dev *pdev;
<------>int rc;
 
<------>if (!zpci_fn_configured(zdev->state))
<------><------>return -EIO;
 
<------>pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
<------>if (pdev && pci_num_vf(pdev)) {
<------><------>pci_dev_put(pdev);
<------><------>return -EBUSY;
<------>}
<------>pci_dev_put(pdev);
 
<------>zpci_remove_device(zdev, false);
 
<------>rc = zpci_disable_device(zdev);
<------>if (rc)
<------><------>return rc;
 
<------>return zdev_deconfigure(zdev);
}
 
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
<------>struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
<------><------><------><------><------>     hotplug_slot);
 
<------>*value = zpci_is_device_configured(zdev) ? 1 : 0;
<------>return 0;
}
 
static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
<------>/* if the slot exits it always contains a function */
<------>*value = 1;
<------>return 0;
}
 
static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
<------>.enable_slot =		enable_slot,
<------>.disable_slot =		disable_slot,
<------>.get_power_status =	get_power_status,
<------>.get_adapter_status =	get_adapter_status,
};
 
int zpci_init_slot(struct zpci_dev *zdev)
{
<------>char name[SLOT_NAME_SIZE];
<------>struct zpci_bus *zbus = zdev->zbus;
 
<------>zdev->hotplug_slot.ops = &s390_hotplug_slot_ops;
 
<------>snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
<------>return pci_hp_register(&zdev->hotplug_slot, zbus->bus,
<------><------><------>       zdev->devfn, name);
}
 
void zpci_exit_slot(struct zpci_dev *zdev)
{
<------>pci_hp_deregister(&zdev->hotplug_slot);
}