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48 lines
1.4 KiB
48 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2016 Imagination Technologies |
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* Author: Paul Burton <[email protected]> |
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* |
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* pcibios_align_resource taken from arch/arm/kernel/bios32.c. |
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*/ |
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#include <linux/pci.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 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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struct pci_host_bridge *host_bridge; |
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if (res->flags & IORESOURCE_IO && start & 0x300) |
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start = (start + 0x3ff) & ~0x3ff; |
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start = (start + align - 1) & ~(align - 1); |
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host_bridge = pci_find_host_bridge(dev->bus); |
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if (host_bridge->align_resource) |
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return host_bridge->align_resource(dev, res, |
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start, size, align); |
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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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pci_read_bridge_bases(bus); |
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}
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