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/* 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 */