123 lines
3.9 KiB
C
123 lines
3.9 KiB
C
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/*
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* The VGA aribiter manages VGA space routing and VGA resource decode to
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* allow multiple VGA devices to be used in a system in a safe way.
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*
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* (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
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* (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com>
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* (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#ifndef LINUX_VGA_H
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#define LINUX_VGA_H
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#include <video/vga.h>
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struct pci_dev;
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/* Legacy VGA regions */
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#define VGA_RSRC_NONE 0x00
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#define VGA_RSRC_LEGACY_IO 0x01
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#define VGA_RSRC_LEGACY_MEM 0x02
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#define VGA_RSRC_LEGACY_MASK (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM)
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/* Non-legacy access */
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#define VGA_RSRC_NORMAL_IO 0x04
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#define VGA_RSRC_NORMAL_MEM 0x08
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#ifdef CONFIG_VGA_ARB
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void vga_set_legacy_decoding(struct pci_dev *pdev, unsigned int decodes);
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int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible);
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void vga_put(struct pci_dev *pdev, unsigned int rsrc);
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struct pci_dev *vga_default_device(void);
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void vga_set_default_device(struct pci_dev *pdev);
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int vga_remove_vgacon(struct pci_dev *pdev);
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int vga_client_register(struct pci_dev *pdev,
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unsigned int (*set_decode)(struct pci_dev *pdev, bool state));
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#else /* CONFIG_VGA_ARB */
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static inline void vga_set_legacy_decoding(struct pci_dev *pdev,
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unsigned int decodes)
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{
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};
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static inline int vga_get(struct pci_dev *pdev, unsigned int rsrc,
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int interruptible)
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{
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return 0;
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}
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static inline void vga_put(struct pci_dev *pdev, unsigned int rsrc)
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{
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}
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static inline struct pci_dev *vga_default_device(void)
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{
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return NULL;
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}
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static inline void vga_set_default_device(struct pci_dev *pdev)
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{
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}
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static inline int vga_remove_vgacon(struct pci_dev *pdev)
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{
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return 0;
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}
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static inline int vga_client_register(struct pci_dev *pdev,
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unsigned int (*set_decode)(struct pci_dev *pdev, bool state))
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{
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return 0;
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}
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#endif /* CONFIG_VGA_ARB */
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/**
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* vga_get_interruptible
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* @pdev: pci device of the VGA card or NULL for the system default
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* @rsrc: bit mask of resources to acquire and lock
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*
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* Shortcut to vga_get with interruptible set to true.
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*
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* On success, release the VGA resource again with vga_put().
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*/
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static inline int vga_get_interruptible(struct pci_dev *pdev,
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unsigned int rsrc)
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{
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return vga_get(pdev, rsrc, 1);
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}
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/**
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* vga_get_uninterruptible - shortcut to vga_get()
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* @pdev: pci device of the VGA card or NULL for the system default
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* @rsrc: bit mask of resources to acquire and lock
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*
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* Shortcut to vga_get with interruptible set to false.
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*
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* On success, release the VGA resource again with vga_put().
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*/
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static inline int vga_get_uninterruptible(struct pci_dev *pdev,
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unsigned int rsrc)
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{
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return vga_get(pdev, rsrc, 0);
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}
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static inline void vga_client_unregister(struct pci_dev *pdev)
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{
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vga_client_register(pdev, NULL);
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}
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#endif /* LINUX_VGA_H */
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