You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
158 lines
5.1 KiB
158 lines
5.1 KiB
/*
|
|
* 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 */
|
|
|