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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/mips/lib/iomap-pci.c
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// SPDX-License-Identifier: GPL-2.0

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/*

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 * Implement the default iomap interfaces

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 *

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 * (C) Copyright 2004 Linus Torvalds

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 * (C) Copyright 2006 Ralf Baechle <[email protected]>

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 * (C) Copyright 2007 MIPS Technologies, Inc.

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 *     written by Ralf Baechle <[email protected]>

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 */

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#include <linux/pci.h>

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#include <linux/export.h>

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#include <asm/io.h>

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#ifdef CONFIG_PCI_DRIVERS_LEGACY

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void __iomem *__pci_ioport_map(struct pci_dev *dev,

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			       unsigned long port, unsigned int nr)

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{

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	struct pci_controller *ctrl = dev->bus->sysdata;

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	unsigned long base = ctrl->io_map_base;

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	/* This will eventually become a BUG_ON but for now be gentle */

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	if (unlikely(!ctrl->io_map_base)) {

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		struct pci_bus *bus = dev->bus;

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		char name[8];

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		while (bus->parent)

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			bus = bus->parent;

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		ctrl->io_map_base = base = mips_io_port_base;

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		sprintf(name, "%04x:%02x", pci_domain_nr(bus), bus->number);

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		printk(KERN_WARNING "io_map_base of root PCI bus %s unset.  "

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		       "Trying to continue but you better\nfix this issue or "

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		       "report it to [email protected] or your "

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		       "vendor.\n", name);

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#ifdef CONFIG_PCI_DOMAINS

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		panic("To avoid data corruption io_map_base MUST be set with "

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		      "multiple PCI domains.");

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#endif

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	}

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	return (void __iomem *) (ctrl->io_map_base + port);

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}

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void pci_iounmap(struct pci_dev *dev, void __iomem *addr)

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{

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	struct pci_controller *ctrl = dev->bus->sysdata;

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	void __iomem *base = (void __iomem *)ctrl->io_map_base;

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	if (addr < base || addr > (base + resource_size(ctrl->io_resource)))

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		iounmap(addr);

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}

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EXPORT_SYMBOL(pci_iounmap);

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#endif /* CONFIG_PCI_DRIVERS_LEGACY */

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