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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b962aeb022
MIPS has a copy of lib/iomap.c with minor alterations, none of which are
necessary given appropriate definitions of PIO_OFFSET, PIO_MASK &
PIO_RESERVED. Provide such definitions, select GENERIC_IOMAP & remove
arch/mips/lib/iomap.c to cut back on the needless duplication.
The one change this does make is to our mmio_{in,out}s[bwl] functions,
which began to deviate from their generic counterparts with commit
0845bb721e ("MIPS: iomap: Use __mem_{read,write}{b,w,l} for MMIO"). I
suspect that this commit was incorrect, and that the SEAD-3 platform
should have instead selected CONFIG_SWAP_IO_SPACE. Since the SEAD-3
platform code is now gone & the board is instead supported by the
generic platform (CONFIG_MIPS_GENERIC) which selects
CONFIG_SWAP_IO_SPACE anyway, this shouldn't be a problem any more.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20342/
Cc: linux-mips@linux-mips.org
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
// 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 <ralf@linux-mips.org>
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* (C) Copyright 2007 MIPS Technologies, Inc.
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* written by Ralf Baechle <ralf@linux-mips.org>
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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 linux-mips@linux-mips.org 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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#endif /* CONFIG_PCI_DRIVERS_LEGACY */
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