diff options
Diffstat (limited to 'drivers/video/via/via_io.h')
| -rw-r--r-- | drivers/video/via/via_io.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/video/via/via_io.h b/drivers/video/via/via_io.h new file mode 100644 index 00000000000..e1c1093def0 --- /dev/null +++ b/drivers/video/via/via_io.h @@ -0,0 +1,58 @@ +/* + * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved. + * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved. + * Copyright 2010 Florian Tobias Schandinat <FlorianSchandinat@gmx.de> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; + * either version 2, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even + * the implied warranty of MERCHANTABILITY or FITNESS FOR + * A PARTICULAR PURPOSE.See the GNU General Public License + * for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ +/* + * basic io functions + */ + +#ifndef __VIA_IO_H__ +#define __VIA_IO_H__ + +#include <linux/types.h> +#include <linux/io.h> + +/* + * Indexed port operations. Note that these are all multi-op + * functions; every invocation will be racy if you're not holding + * reg_lock. + */ +static inline u8 via_read_reg(u16 port, u8 index) +{ + outb(index, port); + return inb(port + 1); +} + +static inline void via_write_reg(u16 port, u8 index, u8 data) +{ + outb(index, port); + outb(data, port + 1); +} + +static inline void via_write_reg_mask(u16 port, u8 index, u8 data, u8 mask) +{ + u8 old; + + outb(index, port); + old = inb(port + 1); + outb((data & mask) | (old & ~mask), port + 1); +} + +#endif /* __VIA_IO_H__ */ |