Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Purpose:	PCI Express Port Bus Driver
 * Author:	Tom Nguyen <tom.l.nguyen@intel.com>
 *
 * Copyright (C) 2004 Intel
 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
 */
 
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/init.h>
#include <linux/aer.h>
#include <linux/dmi.h>
 
#include "../pci.h"
#include "portdrv.h"
 
/* If this switch is set, PCIe port native services should not be enabled. */
bool pcie_ports_disabled;
 
/*
 * If the user specified "pcie_ports=native", use the PCIe services regardless
 * of whether the platform has given us permission.  On ACPI systems, this
 * means we ignore _OSC.
 */
bool pcie_ports_native;
 
/*
 * If the user specified "pcie_ports=dpc-native", use the Linux DPC PCIe
 * service even if the platform hasn't given us permission.
 */
bool pcie_ports_dpc_native;
 
static int __init pcie_port_setup(char *str)
{
<------>if (!strncmp(str, "compat", 6))
<------><------>pcie_ports_disabled = true;
<------>else if (!strncmp(str, "native", 6))
<------><------>pcie_ports_native = true;
<------>else if (!strncmp(str, "dpc-native", 10))
<------><------>pcie_ports_dpc_native = true;
 
<------>return 1;
}
__setup("pcie_ports=", pcie_port_setup);
 
/* global data */
 
#ifdef CONFIG_PM
static int pcie_port_runtime_suspend(struct device *dev)
{
<------>if (!to_pci_dev(dev)->bridge_d3)
<------><------>return -EBUSY;
 
<------>return pcie_port_device_runtime_suspend(dev);
}
 
static int pcie_port_runtime_idle(struct device *dev)
{
<------>/*
<------> * Assume the PCI core has set bridge_d3 whenever it thinks the port
<------> * should be good to go to D3.  Everything else, including moving
<------> * the port to D3, is handled by the PCI core.
<------> */
<------>return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
}
 
static const struct dev_pm_ops pcie_portdrv_pm_ops = {
<------>.suspend	= pcie_port_device_suspend,
<------>.resume_noirq	= pcie_port_device_resume_noirq,
<------>.resume		= pcie_port_device_resume,
<------>.freeze		= pcie_port_device_suspend,
<------>.thaw		= pcie_port_device_resume,
<------>.poweroff	= pcie_port_device_suspend,
<------>.restore_noirq	= pcie_port_device_resume_noirq,
<------>.restore	= pcie_port_device_resume,
<------>.runtime_suspend = pcie_port_runtime_suspend,
<------>.runtime_resume	= pcie_port_device_runtime_resume,
<------>.runtime_idle	= pcie_port_runtime_idle,
};
 
#define PCIE_PORTDRV_PM_OPS	(&pcie_portdrv_pm_ops)
 
#else /* !PM */
 
#define PCIE_PORTDRV_PM_OPS	NULL
#endif /* !PM */
 
/*
 * pcie_portdrv_probe - Probe PCI-Express port devices
 * @dev: PCI-Express port device being probed
 *
 * If detected invokes the pcie_port_device_register() method for
 * this port device.
 *
 */
static int pcie_portdrv_probe(struct pci_dev *dev,
<------><------><------><------><------>const struct pci_device_id *id)
{
<------>int status;
 
<------>if (!pci_is_pcie(dev) ||
<------>    ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
<------>     (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
<------>     (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
<------><------>return -ENODEV;
 
<------>status = pcie_port_device_register(dev);
<------>if (status)
<------><------>return status;
 
<------>pci_save_state(dev);
 
<------>dev_pm_set_driver_flags(&dev->dev, DPM_FLAG_NO_DIRECT_COMPLETE |
<------><------><------><------><------>   DPM_FLAG_SMART_SUSPEND);
 
<------>if (pci_bridge_d3_possible(dev)) {
<------><------>/*
<------><------> * Keep the port resumed 100ms to make sure things like
<------><------> * config space accesses from userspace (lspci) will not
<------><------> * cause the port to repeatedly suspend and resume.
<------><------> */
<------><------>pm_runtime_set_autosuspend_delay(&dev->dev, 100);
<------><------>pm_runtime_use_autosuspend(&dev->dev);
<------><------>pm_runtime_mark_last_busy(&dev->dev);
<------><------>pm_runtime_put_autosuspend(&dev->dev);
<------><------>pm_runtime_allow(&dev->dev);
<------>}
 
<------>return 0;
}
 
static void pcie_portdrv_remove(struct pci_dev *dev)
{
<------>if (pci_bridge_d3_possible(dev)) {
<------><------>pm_runtime_forbid(&dev->dev);
<------><------>pm_runtime_get_noresume(&dev->dev);
<------><------>pm_runtime_dont_use_autosuspend(&dev->dev);
<------>}
 
<------>pcie_port_device_remove(dev);
}
 
static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
<------><------><------><------><------>pci_channel_state_t error)
{
<------>/* Root Port has no impact. Always recovers. */
<------>return PCI_ERS_RESULT_CAN_RECOVER;
}
 
static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
{
<------>pci_restore_state(dev);
<------>pci_save_state(dev);
<------>return PCI_ERS_RESULT_RECOVERED;
}
 
static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
{
<------>return PCI_ERS_RESULT_RECOVERED;
}
 
static int resume_iter(struct device *device, void *data)
{
<------>struct pcie_device *pcie_device;
<------>struct pcie_port_service_driver *driver;
 
<------>if (device->bus == &pcie_port_bus_type && device->driver) {
<------><------>driver = to_service_driver(device->driver);
<------><------>if (driver && driver->error_resume) {
<------><------><------>pcie_device = to_pcie_device(device);
 
<------><------><------>/* Forward error message to service drivers */
<------><------><------>driver->error_resume(pcie_device->port);
<------><------>}
<------>}
 
<------>return 0;
}
 
static void pcie_portdrv_err_resume(struct pci_dev *dev)
{
<------>device_for_each_child(&dev->dev, NULL, resume_iter);
}
 
/*
 * LINUX Device Driver Model
 */
static const struct pci_device_id port_pci_ids[] = {
<------>/* handle any PCI-Express port */
<------>{ PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0) },
<------>/* subtractive decode PCI-to-PCI bridge, class type is 060401h */
<------>{ PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x01), ~0) },
<------>{ },
};
 
static const struct pci_error_handlers pcie_portdrv_err_handler = {
<------>.error_detected = pcie_portdrv_error_detected,
<------>.slot_reset = pcie_portdrv_slot_reset,
<------>.mmio_enabled = pcie_portdrv_mmio_enabled,
<------>.resume = pcie_portdrv_err_resume,
};
 
static struct pci_driver pcie_portdriver = {
<------>.name		= "pcieport",
<------>.id_table	= &port_pci_ids[0],
 
<------>.probe		= pcie_portdrv_probe,
<------>.remove		= pcie_portdrv_remove,
<------>.shutdown	= pcie_portdrv_remove,
 
<------>.err_handler	= &pcie_portdrv_err_handler,
 
<------>.driver.pm	= PCIE_PORTDRV_PM_OPS,
};
 
static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
{
<------>pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
<------><------>  d->ident);
<------>pcie_pme_disable_msi();
<------>return 0;
}
 
static const struct dmi_system_id pcie_portdrv_dmi_table[] __initconst = {
<------>/*
<------> * Boxes that should not use MSI for PCIe PME signaling.
<------> */
<------>{
<------> .callback = dmi_pcie_pme_disable_msi,
<------> .ident = "MSI Wind U-100",
<------> .matches = {
<------><------>     DMI_MATCH(DMI_SYS_VENDOR,
<------><------><------><------>"MICRO-STAR INTERNATIONAL CO., LTD"),
<------><------>     DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
<------><------>     },
<------> },
<------> {}
};
 
static void __init pcie_init_services(void)
{
<------>pcie_aer_init();
<------>pcie_pme_init();
<------>pcie_dpc_init();
<------>pcie_hp_init();
}
 
static int __init pcie_portdrv_init(void)
{
<------>if (pcie_ports_disabled)
<------><------>return -EACCES;
 
<------>pcie_init_services();
<------>dmi_check_system(pcie_portdrv_dmi_table);
 
<------>return pci_register_driver(&pcie_portdriver);
}
device_initcall(pcie_portdrv_init);