| /* |
| * 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 int vga_tryget(struct pci_dev *pdev, unsigned int rsrc); |
| #else |
| static inline int vga_tryget(struct pci_dev *pdev, unsigned int rsrc) { return 0; } |
| #endif |
| |
| #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); |
| #else |
| static inline struct pci_dev *vga_default_device(void) { return NULL; }; |
| static inline void vga_set_default_device(struct pci_dev *pdev) { }; |
| #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 */ |