Release 4.12 include/linux/via.h

/* Miscellaneous definitions for VIA chipsets
   Currently used only by drivers/parport/parport_pc.c */

/* Values for SuperIO function select configuration register */

#define VIA_FUNCTION_PARPORT_SPP     0x00

#define VIA_FUNCTION_PARPORT_ECP     0x01

#define VIA_FUNCTION_PARPORT_EPP     0x02

#define VIA_FUNCTION_PARPORT_DISABLE 0x03

#define VIA_FUNCTION_PROBE           0xFF 
/* Special magic value to be used in code, not to be written into chip */

/* Bits for parallel port mode configuration register */

#define VIA_PARPORT_ECPEPP 0X20

#define VIA_PARPORT_BIDIR  0x80

/* VIA configuration registers */

#define VIA_CONFIG_INDEX 0x3F0

#define VIA_CONFIG_DATA  0x3F1

/* Mask for parallel port IRQ bits (in ISA PnP IRQ routing register 1) */

#define VIA_IRQCONTROL_PARALLEL 0xF0
/* Mask for parallel port DMA bits (in ISA PnP DMA routing register) */

#define VIA_DMACONTROL_PARALLEL 0x0C
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