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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* All IO necessary to poke VGA registers.
*/
#include <pc80/vga_io.h>
#include <arch/io.h>
#define VGA_CR_INDEX 0x3D4
#define VGA_CR_VALUE 0x3D5
#define VGA_SR_INDEX 0x3C4
#define VGA_SR_VALUE 0x3C5
#define VGA_GR_INDEX 0x3CE
#define VGA_GR_VALUE 0x3CF
#define VGA_AR_INDEX 0x3C0
#define VGA_AR_VALUE_READ 0x3C1
#define VGA_AR_VALUE_WRITE VGA_AR_INDEX
#define VGA_MISC_WRITE 0x3C2
#define VGA_MISC_READ 0x3CC
#define VGA_ENABLE 0x3C3
#define VGA_STAT1 0x3DA
#define VGA_DAC_MASK 0x3C6
#define VGA_DAC_READ_ADDRESS 0x3C7
#define VGA_DAC_WRITE_ADDRESS 0x3C8
#define VGA_DAC_DATA 0x3C9
/*
* VGA enable. Poke this to have the PCI IO enabled device accept VGA IO.
*/
unsigned char
vga_enable_read(void)
{
return inb(VGA_ENABLE);
}
void
vga_enable_write(unsigned char value)
{
outb(value, VGA_ENABLE);
}
void
vga_enable_mask(unsigned char value, unsigned char mask)
{
unsigned char tmp;
tmp = vga_enable_read();
tmp &= ~mask;
tmp |= (value & mask);
vga_enable_write(tmp);
}
/*
* Miscellaneous register.
*/
unsigned char
vga_misc_read(void)
{
return inb(VGA_MISC_READ);
}
void
vga_misc_write(unsigned char value)
{
outb(value, VGA_MISC_WRITE);
}
void
vga_misc_mask(unsigned char value, unsigned char mask)
{
unsigned char tmp;
tmp = vga_misc_read();
tmp &= ~mask;
tmp |= (value & mask);
vga_misc_write(tmp);
}
/*
* Sequencer registers.
*/
unsigned char
vga_sr_read(unsigned char index)
{
outb(index, VGA_SR_INDEX);
return (inb(VGA_SR_VALUE));
}
void
vga_sr_write(unsigned char index, unsigned char value)
{
outb(index, VGA_SR_INDEX);
outb(value, VGA_SR_VALUE);
}
void
vga_sr_mask(unsigned char index, unsigned char value, unsigned char mask)
{
unsigned char tmp;
tmp = vga_sr_read(index);
tmp &= ~mask;
tmp |= (value & mask);
vga_sr_write(index, tmp);
}
/*
* CRTC registers.
*/
unsigned char
vga_cr_read(unsigned char index)
{
outb(index, VGA_CR_INDEX);
return (inb(VGA_CR_VALUE));
}
void
vga_cr_write(unsigned char index, unsigned char value)
{
outb(index, VGA_CR_INDEX);
outb(value, VGA_CR_VALUE);
}
void
vga_cr_mask(unsigned char index, unsigned char value, unsigned char mask)
{
unsigned char tmp;
tmp = vga_cr_read(index);
tmp &= ~mask;
tmp |= (value & mask);
vga_cr_write(index, tmp);
}
/*
* Attribute registers.
*/
unsigned char
vga_ar_read(unsigned char index)
{
unsigned char ret;
(void)inb(VGA_STAT1);
outb(index, VGA_AR_INDEX);
ret = inb(VGA_AR_VALUE_READ);
(void)inb(VGA_STAT1);
return ret;
}
void
vga_ar_write(unsigned char index, unsigned char value)
{
(void)inb(VGA_STAT1);
outb(index, VGA_AR_INDEX);
outb(value, VGA_AR_VALUE_WRITE);
(void)inb(VGA_STAT1);
}
void
vga_ar_mask(unsigned char index, unsigned char value, unsigned char mask)
{
unsigned char tmp;
tmp = vga_ar_read(index);
tmp &= ~mask;
tmp |= (value & mask);
vga_ar_write(index, tmp);
}
/*
* Graphics registers.
*/
unsigned char
vga_gr_read(unsigned char index)
{
outb(index, VGA_GR_INDEX);
return (inb(VGA_GR_VALUE));
}
void
vga_gr_write(unsigned char index, unsigned char value)
{
outb(index, VGA_GR_INDEX);
outb(value, VGA_GR_VALUE);
}
void
vga_gr_mask(unsigned char index, unsigned char value, unsigned char mask)
{
unsigned char tmp;
tmp = vga_gr_read(index);
tmp &= ~mask;
tmp |= (value & mask);
vga_gr_write(index, tmp);
}
/*
* DAC functions.
*/
void
vga_palette_enable(void)
{
(void)inb(VGA_STAT1);
outb(0x00, VGA_AR_INDEX);
(void)inb(VGA_STAT1);
}
void
vga_palette_disable(void)
{
(void)inb(VGA_STAT1);
outb(0x20, VGA_AR_INDEX);
(void)inb(VGA_STAT1);
}
unsigned char
vga_dac_mask_read(void)
{
return inb(VGA_DAC_MASK);
}
void
vga_dac_mask_write(unsigned char mask)
{
outb(mask, VGA_DAC_MASK);
}
void
vga_dac_read_address(unsigned char address)
{
outb(address, VGA_DAC_READ_ADDRESS);
}
void
vga_dac_write_address(unsigned char address)
{
outb(address, VGA_DAC_WRITE_ADDRESS);
}
unsigned char
vga_dac_data_read(void)
{
return inb(VGA_DAC_DATA);
}
void
vga_dac_data_write(unsigned char data)
{
outb(data, VGA_DAC_DATA);
}
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