mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 14:06:03 +00:00
55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
/*
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* linux/arch/arm/mm/iomap.c
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*
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* Map IO port and PCI memory spaces so that {read,write}[bwl] can
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* be used to access this memory.
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/ioport.h>
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#include <linux/io.h>
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#ifdef __io
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void __iomem *ioport_map(unsigned long port, unsigned int nr)
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{
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return __io(port);
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}
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EXPORT_SYMBOL(ioport_map);
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void ioport_unmap(void __iomem *addr)
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{
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}
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EXPORT_SYMBOL(ioport_unmap);
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#endif
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#ifdef CONFIG_PCI
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void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
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{
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resource_size_t start = pci_resource_start(dev, bar);
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resource_size_t len = pci_resource_len(dev, bar);
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unsigned long flags = pci_resource_flags(dev, bar);
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if (!len || !start)
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return NULL;
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if (maxlen && len > maxlen)
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len = maxlen;
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if (flags & IORESOURCE_IO)
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return ioport_map(start, len);
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if (flags & IORESOURCE_MEM) {
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if (flags & IORESOURCE_CACHEABLE)
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return ioremap(start, len);
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return ioremap_nocache(start, len);
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}
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return NULL;
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}
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EXPORT_SYMBOL(pci_iomap);
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void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
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{
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if ((unsigned long)addr >= VMALLOC_START &&
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(unsigned long)addr < VMALLOC_END)
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iounmap(addr);
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}
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EXPORT_SYMBOL(pci_iounmap);
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#endif
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