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154 lines
5.1 KiB
154 lines
5.1 KiB
/* |
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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 <[email protected]> |
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* (C) Copyright 2007 Paulo R. Zanoni <[email protected]> |
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* (C) Copyright 2007, 2009 Tiago Vignatti <[email protected]> |
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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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/* 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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/* Passing that instead of a pci_dev to use the system "default" |
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* device, that is the one used by vgacon. Archs will probably |
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* have to provide their own vga_default_device(); |
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*/ |
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#define VGA_DEFAULT_DEVICE (NULL) |
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struct pci_dev; |
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/* For use by clients */ |
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/** |
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* vga_set_legacy_decoding |
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* |
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* @pdev: pci device of the VGA card |
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* @decodes: bit mask of what legacy regions the card decodes |
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* |
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* Indicates to the arbiter if the card decodes legacy VGA IOs, |
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* legacy VGA Memory, both, or none. All cards default to both, |
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* the card driver (fbdev for example) should tell the arbiter |
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* if it has disabled legacy decoding, so the card can be left |
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* out of the arbitration process (and can be safe to take |
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* interrupts at any time. |
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*/ |
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#if defined(CONFIG_VGA_ARB) |
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extern void vga_set_legacy_decoding(struct pci_dev *pdev, |
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unsigned int decodes); |
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#else |
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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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#endif |
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#if defined(CONFIG_VGA_ARB) |
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extern int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible); |
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#else |
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static inline int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible) { return 0; } |
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#endif |
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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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#if defined(CONFIG_VGA_ARB) |
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extern void vga_put(struct pci_dev *pdev, unsigned int rsrc); |
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#else |
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#define vga_put(pdev, rsrc) |
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#endif |
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#ifdef CONFIG_VGA_ARB |
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extern struct pci_dev *vga_default_device(void); |
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extern void vga_set_default_device(struct pci_dev *pdev); |
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extern int vga_remove_vgacon(struct pci_dev *pdev); |
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#else |
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static inline struct pci_dev *vga_default_device(void) { return NULL; } |
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static inline void vga_set_default_device(struct pci_dev *pdev) { } |
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static inline int vga_remove_vgacon(struct pci_dev *pdev) { return 0; } |
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#endif |
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/* |
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* Architectures should define this if they have several |
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* independent PCI domains that can afford concurrent VGA |
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* decoding |
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*/ |
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#ifndef __ARCH_HAS_VGA_CONFLICT |
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static inline int vga_conflicts(struct pci_dev *p1, struct pci_dev *p2) |
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{ |
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return 1; |
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} |
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#endif |
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#if defined(CONFIG_VGA_ARB) |
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int vga_client_register(struct pci_dev *pdev, void *cookie, |
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void (*irq_set_state)(void *cookie, bool state), |
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unsigned int (*set_vga_decode)(void *cookie, bool state)); |
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#else |
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static inline int vga_client_register(struct pci_dev *pdev, void *cookie, |
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void (*irq_set_state)(void *cookie, bool state), |
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unsigned int (*set_vga_decode)(void *cookie, bool state)) |
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{ |
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return 0; |
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} |
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#endif |
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#endif /* LINUX_VGA_H */
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