104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
|
/* SPDX-License-Identifier: MIT */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef LINUX_VGA_H
|
||
|
|
#define LINUX_VGA_H
|
||
|
|
|
||
|
|
#include <video/vga.h>
|
||
|
|
|
||
|
|
struct pci_dev;
|
||
|
|
|
||
|
|
/* 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
|
||
|
|
|
||
|
|
#ifdef CONFIG_VGA_ARB
|
||
|
|
void vga_set_legacy_decoding(struct pci_dev *pdev, unsigned int decodes);
|
||
|
|
int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible);
|
||
|
|
void vga_put(struct pci_dev *pdev, unsigned int rsrc);
|
||
|
|
struct pci_dev *vga_default_device(void);
|
||
|
|
void vga_set_default_device(struct pci_dev *pdev);
|
||
|
|
int vga_remove_vgacon(struct pci_dev *pdev);
|
||
|
|
int vga_client_register(struct pci_dev *pdev,
|
||
|
|
unsigned int (*set_decode)(struct pci_dev *pdev, bool state));
|
||
|
|
#else /* CONFIG_VGA_ARB */
|
||
|
|
static inline void vga_set_legacy_decoding(struct pci_dev *pdev,
|
||
|
|
unsigned int decodes)
|
||
|
|
{
|
||
|
|
};
|
||
|
|
static inline int vga_get(struct pci_dev *pdev, unsigned int rsrc,
|
||
|
|
int interruptible)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
static inline void vga_put(struct pci_dev *pdev, unsigned int rsrc)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
static inline int vga_client_register(struct pci_dev *pdev,
|
||
|
|
unsigned int (*set_decode)(struct pci_dev *pdev, bool state))
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
#endif /* CONFIG_VGA_ARB */
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void vga_client_unregister(struct pci_dev *pdev)
|
||
|
|
{
|
||
|
|
vga_client_register(pdev, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* LINUX_VGA_H */
|