| /* | |
| * The VGA aribiter manages VGA space routing and VGA resource decode to | |
| * allow multiple VGA devices to be used in a system in a safe way. | |
| * | |
| * (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org> | |
| * (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com> | |
| * (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org> | |
| * | |
| * Permission is hereby granted, free of charge, to any person obtaining a | |
| * copy of this software and associated documentation files (the "Software"), | |
| * to deal in the Software without restriction, including without limitation | |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
| * and/or sell copies of the Software, and to permit persons to whom the | |
| * Software is furnished to do so, subject to the following conditions: | |
| * | |
| * The above copyright notice and this permission notice (including the next | |
| * paragraph) shall be included in all copies or substantial portions of the | |
| * Software. | |
| * | |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
| * DEALINGS | |
| * IN THE SOFTWARE. | |
| * | |
| */ | |
| #ifndef LINUX_VGA_H | |
| #define LINUX_VGA_H | |
| #include <video/vga.h> | |
| /* Legacy VGA regions */ | |
| #define VGA_RSRC_NONE 0x00 | |
| #define VGA_RSRC_LEGACY_IO 0x01 | |
| #define VGA_RSRC_LEGACY_MEM 0x02 | |
| #define VGA_RSRC_LEGACY_MASK (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM) | |
| /* Non-legacy access */ | |
| #define VGA_RSRC_NORMAL_IO 0x04 | |
| #define VGA_RSRC_NORMAL_MEM 0x08 | |
| /* Passing that instead of a pci_dev to use the system "default" | |
| * device, that is the one used by vgacon. Archs will probably | |
| * have to provide their own vga_default_device(); | |
| */ | |
| #define VGA_DEFAULT_DEVICE (NULL) | |
| struct pci_dev; | |
| /* For use by clients */ | |
| /** | |
| * vga_set_legacy_decoding | |
| * | |
| * @pdev: pci device of the VGA card | |
| * @decodes: bit mask of what legacy regions the card decodes | |
| * | |
| * Indicates to the arbiter if the card decodes legacy VGA IOs, | |
| * legacy VGA Memory, both, or none. All cards default to both, | |
| * the card driver (fbdev for example) should tell the arbiter | |
| * if it has disabled legacy decoding, so the card can be left | |
| * out of the arbitration process (and can be safe to take | |
| * interrupts at any time. | |
| */ | |
| #if defined(CONFIG_VGA_ARB) | |
| extern void vga_set_legacy_decoding(struct pci_dev *pdev, | |
| unsigned int decodes); | |
| #else | |
| static inline void vga_set_legacy_decoding(struct pci_dev *pdev, | |
| unsigned int decodes) { }; | |
| #endif | |
| #if defined(CONFIG_VGA_ARB) | |
| extern int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible); | |
| #else | |
| static inline int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible) { return 0; } | |
| #endif | |
| /** | |
| * vga_get_interruptible | |
| * @pdev: pci device of the VGA card or NULL for the system default | |
| * @rsrc: bit mask of resources to acquire and lock | |
| * | |
| * Shortcut to vga_get with interruptible set to true. | |
| * | |
| * On success, release the VGA resource again with vga_put(). | |
| */ | |
| static inline int vga_get_interruptible(struct pci_dev *pdev, | |
| unsigned int rsrc) | |
| { | |
| return vga_get(pdev, rsrc, 1); | |
| } | |
| /** | |
| * vga_get_uninterruptible - shortcut to vga_get() | |
| * @pdev: pci device of the VGA card or NULL for the system default | |
| * @rsrc: bit mask of resources to acquire and lock | |
| * | |
| * Shortcut to vga_get with interruptible set to false. | |
| * | |
| * On success, release the VGA resource again with vga_put(). | |
| */ | |
| static inline int vga_get_uninterruptible(struct pci_dev *pdev, | |
| unsigned int rsrc) | |
| { | |
| return vga_get(pdev, rsrc, 0); | |
| } | |
| #if defined(CONFIG_VGA_ARB) | |
| extern void vga_put(struct pci_dev *pdev, unsigned int rsrc); | |
| #else | |
| #define vga_put(pdev, rsrc) | |
| #endif | |
| #ifdef CONFIG_VGA_ARB | |
| extern struct pci_dev *vga_default_device(void); | |
| extern void vga_set_default_device(struct pci_dev *pdev); | |
| extern int vga_remove_vgacon(struct pci_dev *pdev); | |
| #else | |
| static inline struct pci_dev *vga_default_device(void) { return NULL; }; | |
| static inline void vga_set_default_device(struct pci_dev *pdev) { }; | |
| static inline int vga_remove_vgacon(struct pci_dev *pdev) { return 0; }; | |
| #endif | |
| /* | |
| * Architectures should define this if they have several | |
| * independent PCI domains that can afford concurrent VGA | |
| * decoding | |
| */ | |
| #ifndef __ARCH_HAS_VGA_CONFLICT | |
| static inline int vga_conflicts(struct pci_dev *p1, struct pci_dev *p2) | |
| { | |
| return 1; | |
| } | |
| #endif | |
| #if defined(CONFIG_VGA_ARB) | |
| int vga_client_register(struct pci_dev *pdev, void *cookie, | |
| void (*irq_set_state)(void *cookie, bool state), | |
| unsigned int (*set_vga_decode)(void *cookie, bool state)); | |
| #else | |
| static inline int vga_client_register(struct pci_dev *pdev, void *cookie, | |
| void (*irq_set_state)(void *cookie, bool state), | |
| unsigned int (*set_vga_decode)(void *cookie, bool state)) | |
| { | |
| return 0; | |
| } | |
| #endif | |
| #endif /* LINUX_VGA_H */ |