linux/drivers/pci/ecam.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright 2016 Broadcom
 */

#include <linux/device.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pci-ecam.h>
#include <linux/slab.h>

/*
 * On 64-bit systems, we do a single ioremap for the whole config space
 * since we have enough virtual address range available.  On 32-bit, we
 * ioremap the config space for each bus individually.
 */
static const bool per_bus_mapping = !IS_ENABLED(…);

/*
 * Create a PCI config space window
 *  - reserve mem region
 *  - alloc struct pci_config_window with space for all mappings
 *  - ioremap the config space
 */
struct pci_config_window *pci_ecam_create(struct device *dev,
		struct resource *cfgres, struct resource *busr,
		const struct pci_ecam_ops *ops)
{ … }
EXPORT_SYMBOL_GPL(…);

void pci_ecam_free(struct pci_config_window *cfg)
{ … }
EXPORT_SYMBOL_GPL(…);

static int pci_ecam_add_bus(struct pci_bus *bus)
{ … }

static void pci_ecam_remove_bus(struct pci_bus *bus)
{ … }

/*
 * Function to implement the pci_ops ->map_bus method
 */
void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn,
			       int where)
{ … }
EXPORT_SYMBOL_GPL(…);

/* ECAM ops */
const struct pci_ecam_ops pci_generic_ecam_ops = …;
EXPORT_SYMBOL_GPL(…);

#if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)
/* ECAM ops for 32-bit access only (non-compliant) */
const struct pci_ecam_ops pci_32b_ops = …;

/* ECAM ops for 32-bit read only (non-compliant) */
const struct pci_ecam_ops pci_32b_read_ops = …;
#endif