linux/drivers/pci/controller/pci-thunder-pem.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2015 - 2016 Cavium, Inc.
 */

#include <linux/bitfield.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/pci-acpi.h>
#include <linux/pci-ecam.h>
#include <linux/platform_device.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include "../pci.h"

#if defined(CONFIG_PCI_HOST_THUNDER_PEM) || (defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS))

#define PEM_CFG_WR …
#define PEM_CFG_RD …

/*
 * Enhanced Configuration Access Mechanism (ECAM)
 *
 * N.B. This is a non-standard platform-specific ECAM bus shift value.  For
 * standard values defined in the PCI Express Base Specification see
 * include/linux/pci-ecam.h.
 */
#define THUNDER_PCIE_ECAM_BUS_SHIFT …

struct thunder_pem_pci { … };

static int thunder_pem_bridge_read(struct pci_bus *bus, unsigned int devfn,
				   int where, int size, u32 *val)
{ … }

static int thunder_pem_config_read(struct pci_bus *bus, unsigned int devfn,
				   int where, int size, u32 *val)
{ … }

/*
 * Some of the w1c_bits below also include read-only or non-writable
 * reserved bits, this makes the code simpler and is OK as the bits
 * are not affected by writing zeros to them.
 */
static u32 thunder_pem_bridge_w1c_bits(u64 where_aligned)
{ … }

/* Some bits must be written to one so they appear to be read-only. */
static u32 thunder_pem_bridge_w1_bits(u64 where_aligned)
{ … }

static int thunder_pem_bridge_write(struct pci_bus *bus, unsigned int devfn,
				    int where, int size, u32 val)
{ … }

static int thunder_pem_config_write(struct pci_bus *bus, unsigned int devfn,
				    int where, int size, u32 val)
{ … }

static int thunder_pem_init(struct device *dev, struct pci_config_window *cfg,
			    struct resource *res_pem)
{ … }

#if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)

#define PEM_RES_BASE …
#define PEM_NODE_MASK …
#define PEM_INDX_MASK …
#define PEM_MIN_DOM_IN_NODE …
#define PEM_MAX_DOM_IN_NODE …

static void thunder_pem_reserve_range(struct device *dev, int seg,
				      struct resource *r)
{ … }

static void thunder_pem_legacy_fw(struct acpi_pci_root *root,
				 struct resource *res_pem)
{ … }

static int thunder_pem_acpi_init(struct pci_config_window *cfg)
{ … }

const struct pci_ecam_ops thunder_pem_ecam_ops = …;

#endif

#ifdef CONFIG_PCI_HOST_THUNDER_PEM

static int thunder_pem_platform_init(struct pci_config_window *cfg)
{ … }

static const struct pci_ecam_ops pci_thunder_pem_ops = …;

static const struct of_device_id thunder_pem_of_match[] = …;

static struct platform_driver thunder_pem_driver = …;
builtin_platform_driver(…) …;

#endif
#endif