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87 lines
2.2 KiB
87 lines
2.2 KiB
// 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 <[email protected]> |
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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) |
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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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