88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* arch/xtensa/kernel/pci.c
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*
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* PCI bios-type initialisation for PCI machines
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*
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* Copyright (C) 2001-2005 Tensilica Inc.
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*
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* Based largely on work from Cort (ppc/kernel/pci.c)
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* IO functions copied from sparc.
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*
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* Chris Zankel <chris@zankel.net>
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*/
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/memblock.h>
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#include <asm/pci-bridge.h>
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#include <asm/platform.h>
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/*
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* We need to avoid collisions with `mirrored' VGA ports
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* and other strange ISA hardware, so we always want the
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* addresses to be allocated in the 0x000-0x0ff region
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* modulo 0x400.
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*
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* Why? Because some silly external IO cards only decode
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* the low 10 bits of the IO address. The 0x00-0xff region
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* is reserved for motherboard devices that decode all 16
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* bits, so it's ok to allocate at, say, 0x2800-0x28ff,
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* but we want to try to avoid allocating at 0x2900-0x2bff
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* which might have be mirrored at 0x0100-0x03ff..
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*/
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resource_size_t
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pcibios_align_resource(void *data, const struct resource *res,
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resource_size_t size, resource_size_t align)
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{
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struct pci_dev *dev = data;
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resource_size_t start = res->start;
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if (res->flags & IORESOURCE_IO) {
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if (size > 0x100) {
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pr_err("PCI: I/O Region %s/%d too large (%u bytes)\n",
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pci_name(dev), dev->resource - res,
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size);
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}
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if (start & 0x300)
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start = (start + 0x3ff) & ~0x3ff;
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}
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return start;
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}
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void pcibios_fixup_bus(struct pci_bus *bus)
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{
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if (bus->parent) {
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/* This is a subordinate bridge */
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pci_read_bridge_bases(bus);
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}
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}
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/*
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* Platform support for /proc/bus/pci/X/Y mmap()s.
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* -- paulus.
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*/
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int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
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{
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struct pci_controller *pci_ctrl = (struct pci_controller*) pdev->sysdata;
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resource_size_t ioaddr = pci_resource_start(pdev, bar);
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if (pci_ctrl == 0)
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return -EINVAL; /* should never happen */
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/* Convert to an offset within this PCI controller */
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ioaddr -= (unsigned long)pci_ctrl->io_space.base;
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vma->vm_pgoff += (ioaddr + pci_ctrl->io_space.start) >> PAGE_SHIFT;
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return 0;
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}
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