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137 lines
4.2 KiB
137 lines
4.2 KiB
// 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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*/ |
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#include <linux/pci.h> |
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#include <linux/io.h> |
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#include <linux/export.h> |
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#ifdef CONFIG_PCI |
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/** |
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* pci_iomap_range - create a virtual mapping cookie for a PCI BAR |
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* @dev: PCI device that owns the BAR |
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* @bar: BAR number |
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* @offset: map memory at the given offset in BAR |
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* @maxlen: max length of the memory to map |
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* |
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* Using this function you will get a __iomem address to your device BAR. |
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* You can access it using ioread*() and iowrite*(). These functions hide |
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* the details if this is a MMIO or PIO address space and will just do what |
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* you expect from them in the correct way. |
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* |
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* @maxlen specifies the maximum length to map. If you want to get access to |
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* the complete BAR from offset to the end, pass %0 here. |
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* */ |
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void __iomem *pci_iomap_range(struct pci_dev *dev, |
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int bar, |
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unsigned long offset, |
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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 <= offset || !start) |
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return NULL; |
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len -= offset; |
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start += offset; |
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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 __pci_ioport_map(dev, start, len); |
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if (flags & IORESOURCE_MEM) |
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return ioremap(start, len); |
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/* What? */ |
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return NULL; |
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} |
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EXPORT_SYMBOL(pci_iomap_range); |
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/** |
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* pci_iomap_wc_range - create a virtual WC mapping cookie for a PCI BAR |
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* @dev: PCI device that owns the BAR |
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* @bar: BAR number |
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* @offset: map memory at the given offset in BAR |
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* @maxlen: max length of the memory to map |
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* |
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* Using this function you will get a __iomem address to your device BAR. |
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* You can access it using ioread*() and iowrite*(). These functions hide |
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* the details if this is a MMIO or PIO address space and will just do what |
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* you expect from them in the correct way. When possible write combining |
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* is used. |
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* |
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* @maxlen specifies the maximum length to map. If you want to get access to |
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* the complete BAR from offset to the end, pass %0 here. |
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* */ |
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void __iomem *pci_iomap_wc_range(struct pci_dev *dev, |
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int bar, |
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unsigned long offset, |
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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 (flags & IORESOURCE_IO) |
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return NULL; |
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if (len <= offset || !start) |
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return NULL; |
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len -= offset; |
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start += offset; |
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if (maxlen && len > maxlen) |
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len = maxlen; |
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if (flags & IORESOURCE_MEM) |
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return ioremap_wc(start, len); |
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/* What? */ |
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return NULL; |
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} |
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EXPORT_SYMBOL_GPL(pci_iomap_wc_range); |
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/** |
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* pci_iomap - create a virtual mapping cookie for a PCI BAR |
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* @dev: PCI device that owns the BAR |
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* @bar: BAR number |
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* @maxlen: length of the memory to map |
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* |
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* Using this function you will get a __iomem address to your device BAR. |
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* You can access it using ioread*() and iowrite*(). These functions hide |
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* the details if this is a MMIO or PIO address space and will just do what |
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* you expect from them in the correct way. |
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* |
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* @maxlen specifies the maximum length to map. If you want to get access to |
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* the complete BAR without checking for its length first, pass %0 here. |
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* */ |
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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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return pci_iomap_range(dev, bar, 0, maxlen); |
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} |
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EXPORT_SYMBOL(pci_iomap); |
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/** |
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* pci_iomap_wc - create a virtual WC mapping cookie for a PCI BAR |
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* @dev: PCI device that owns the BAR |
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* @bar: BAR number |
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* @maxlen: length of the memory to map |
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* |
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* Using this function you will get a __iomem address to your device BAR. |
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* You can access it using ioread*() and iowrite*(). These functions hide |
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* the details if this is a MMIO or PIO address space and will just do what |
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* you expect from them in the correct way. When possible write combining |
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* is used. |
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* |
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* @maxlen specifies the maximum length to map. If you want to get access to |
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* the complete BAR without checking for its length first, pass %0 here. |
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* */ |
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void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen) |
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{ |
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return pci_iomap_wc_range(dev, bar, 0, maxlen); |
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} |
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EXPORT_SYMBOL_GPL(pci_iomap_wc); |
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#endif /* CONFIG_PCI */
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