/*
* linux/drivers/video/mdacon.c -- Low level MDA based console driver
*
* (c) 1998 Andrew Apted <ajapted@netspace.net.au>
*
* including portions (c) 1995-1998 Patrick Caulfield.
*
* slight improvements (c) 2000 Edward Betts <edward@debian.org>
*
* This file is based on the VGA console driver (vgacon.c):
*
* Created 28 Sep 1997 by Geert Uytterhoeven
*
* Rewritten by Martin Mares <mj@ucw.cz>, July 1998
*
* and on the old console.c, vga.c and vesa_blank.c drivers:
*
* Copyright (C) 1991, 1992 Linus Torvalds
* 1995 Jay Estabrook
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*
* Changelog:
* Paul G. (03/2001) Fix mdacon= boot prompt to use __setup().
*/
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/string.h>
#include <linux/kd.h>
#include <linux/slab.h>
#include <linux/vt_kern.h>
#include <linux/vt_buffer.h>
#include <linux/selection.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <asm/io.h>
#include <asm/vga.h>
static DEFINE_SPINLOCK(mda_lock);
/* description of the hardware layout */
static unsigned long mda_vram_base; /* Base of video memory */
static unsigned long mda_vram_len; /* Size of video memory */
static unsigned int mda_num_columns; /* Number of text columns */
static unsigned int mda_num_lines; /* Number of text lines */
static unsigned int mda_index_port; /* Register select port */
static unsigned int mda_value_port; /* Register value port */
static unsigned int mda_mode_port; /* Mode control port */
static unsigned int mda_status_port; /* Status and Config port */
static unsigned int mda_gfx_port; /* Graphics control port */
/* current hardware state */
static int mda_cursor_loc=-1;
static int mda_cursor_size_from=-1;
static int mda_cursor_size_to=-1;
static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type;
static char *mda_type_name;
/* console information */
static int mda_first_vc = 1;
static int mda_last_vc = 16;
static struct vc_data *mda_display_fg = NULL;
module_param(mda_first_vc, int, 0);
module_param(mda_last_vc, int, 0);
/* MDA register values
*/
#define MDA_CURSOR_BLINKING 0x00
#define MDA_CURSOR_OFF 0x20
#define MDA_CURSOR_SLOWBLINK 0x60
#define MDA_MODE_GRAPHICS 0x02
#define MDA_MODE_VIDEO_EN 0x08
#define MDA_MODE_BLINK_EN 0x20
#define MDA_MODE_GFX_PAGE1 0x80
#define MDA_STATUS_HSYNC 0x01
#define MDA_STATUS_VSYNC 0x80
#define MDA_STATUS_VIDEO 0x08
#define MDA_CONFIG_COL132 0x08
#define MDA_GFX_MODE_EN 0x01
#define MDA_GFX_PAGE_EN 0x02
/*
* MDA could easily be classified as "pre-dinosaur hardware".
*/
static void write_mda_b(unsigned int val, unsigned char reg)
{
unsigned long flags;
spin_lock_irqsave(&mda_lock, flags);
outb_p(reg, mda_index_port);
outb_p(val, mda_value_port);
spin_unlock_irqrestore(&mda_lock, flags);
}
static void write_mda_w(unsigned int val, unsigned char reg)
{
unsigned long flags;
spin_lock_irqsave(&mda_lock, flags);
outb_p(reg, mda_index_port); outb_p(val >> 8, mda_value_port);
outb_p(reg+1, mda_index_port); outb_p(val & 0xff, mda_value_port);
spin_unlock_irqrestore(&mda_lock, flags);
}
#ifdef TEST_MDA_B
static int test_mda_b(unsigned char val, unsigned char reg)
{
unsigned long flags;
spin_lock_irqsave(&mda_lock, flags);
outb_p(reg, mda_index_port);
outb (val, mda_value_port);
udelay(20); val = (inb_p(mda_value_port) == val);
spin_unlock_irqrestore(&mda_lock, flags);
return val;
}
#endif
static inline void mda_set_cursor(unsigned int location)
{
if (mda_cursor_loc == location)
return;
write_mda_w(location >> 1, 0x0e);
mda_cursor_loc = location;
}
static inline void mda_set_cursor_size(int from, int to)
{
if (mda_cursor_size_from==from && mda_cursor_size_to==to)
return;
if (from > to) {
write_mda_b(MDA_CURSOR_OFF, 0x0a); /* disable cursor */
} else {
write_mda_b(from, 0x0a); /* cursor start */
write_mda_b(to, 0x0b); /* cursor end */
}
mda_cursor_size_from = from;
mda_cursor_size_to = to;
}
#ifndef MODULE
static int __init mdacon_setup(char *str)
{
/* command line format: mdacon=<first>,<last> */
int ints[3];
str = get_options(str, ARRAY_SIZE(ints), ints);
if (ints[0] < 2)
return 0;
if (ints[1] < 1 || ints[1] > MAX_NR_CONSOLES ||
ints[2] < 1 || ints[2] > MAX_NR_CONSOLES)
return 0;
mda_first_vc = ints[1];
mda_last_vc = ints[2];
return 1;
}
__setup("mdacon=", mdacon_setup);
#endif
static int __init mda_detect(void)
{
int count=0;
u16 *p, p_save;
u16 *q, q_save;
/* do a memory check */
p = (u16 *) mda_vram_base;
q = (u16 *) (mda_vram_base + 0x01000);
p_save = scr_readw(p); q_save = scr_readw(q);
scr_writew(0xAA55, p); if (scr_readw(p) == 0xAA55) count++;
scr_writew(0x55AA, p); if (scr_readw(p) == 0x55AA) count++;
scr_writew(p_save, p);
if (count != 2) {
return 0;
}
/* check if we have 4K or 8K */
scr_writew(0xA55A, q); scr_writew(0x0000, p);
if (scr_readw(q) == 0xA55A) count++;
scr_writew(0x5AA5, q); scr_writew(0x0000, p);
if (scr_readw(q) == 0x5AA5) count++;
scr_writew(p_save, p); scr_writew(q_save, q);
if (count == 4) {
mda_vram_len = 0x02000;
}
/* Ok, there is definitely a card registering at the correct
* memory location, so now we do an I/O port test.
*/
#ifdef TEST_MDA_B
/* Edward: These two mess `tests' mess up my cursor on bootup */
/* cursor low register */
if (! test_mda_b(0x66, 0x0f)) {
return 0;
}
/* cursor low register */
if (! test_mda_b(0x99, 0x0f)) {
return 0;
}
#endif
/* See if the card is a Hercules, by checking whether the vsync
* bit of the status register is changing. This test lasts for
* approximately 1/10th of a second.
*/
p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC;
for (count=0; count < 50000 && p_save == q_save; count++) {
q_save = inb(mda_status_port) & MDA_STATUS_VSYNC;
udelay(2);
}
if (p_save != q_save) {
switch (inb_p(mda_status_port) & 0x70) {
case 0x10:
mda_type = TYPE_HERCPLUS;
mda_type_name = "HerculesPlus";
break;
case 0x50:
mda_type = TYPE_HERCCOLOR;
mda_type_name = "HerculesColor";
break;
default:
mda_type = TYPE_HERC;
mda_type_name = "Hercules";
break;
}
}
return 1;
}
static void __init mda_initialize(void)
{
write_mda_b(97, 0x00); /* horizontal total */
write_mda_b(80, 0x01); /* horizontal displayed */
write_mda_b(82, 0x02); /* horizontal sync pos */
write_mda_b(15, 0x03); /* horizontal sync width */
write_mda_b(25, 0x04); /* vertical total */
write_mda_b(6, 0x05); /* vertical total adjust */
write_mda_b(25, 0x06); /* vertical displayed */
write_mda_b(25, 0x07); /* vertical sync pos */
write_mda_b(2, 0x08); /* interlace mode */
write_mda_b(13, 0x09); /* maximum scanline */
write_mda_b(12, 0x0a); /* cursor start */
write_mda_b(13, 0x0b); /* cursor end */
write_mda_w(0x0000, 0x0c); /* start address */
write_mda_w(0x0000, 0x0e); /* cursor location */
outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, mda_mode_port);
outb_p(0x00, mda_status_port);
outb_p(0x00, mda_gfx_port);
}
static const char *mdacon_startup(void)
{
mda_num_columns = 80;
mda_num_lines = 25;
mda_vram_len = 0x01000;
mda_vram_base = VGA_MAP_MEM(0xb0000, mda_vram_len);
mda_index_port = 0x3b4;
mda_value_port = 0x3b5;
mda_mode_port = 0x3b8;
mda_status_port = 0x3ba;
mda_gfx_port = 0x3bf;
mda_type = TYPE_MDA;
mda_type_name = "MDA";
if (! mda_detect()) {
printk("mdacon: MDA card not detected.\n");
return NULL;
}
if (mda_type != TYPE_MDA) {
mda_initialize();
}
/* cursor looks ugly during boot-up, so turn it off */
mda_set_cursor(mda_vram_len - 1);
printk("mdacon: %s with %ldK of memory detected.\n",
mda_type_name, mda_vram_len/1024);
return "MDA-2";
}
static void mdacon_init(struct vc_data *c, int init)
{
c->vc_complement_mask = 0x0800; /* reverse video */
c->vc_display_fg = &mda_display_fg;
if (init) {
c->vc_cols = mda_num_columns;
c->vc_rows = mda_num_lines;
} else
vc_resize(c, mda_num_columns, mda_num_lines);
/* make the first MDA console visible */
if (mda_display_fg == NULL)
mda_display_fg = c;
}
static void mdacon_deinit(struct vc_data *c)
{
/* con_set_default_unimap(c->vc_num); */
if (mda_display_fg == c)
mda_display_fg = NULL;
}
static inline u16 mda_convert_attr(u16 ch)
{
u16 attr = 0x0700;
/* Underline and reverse-video are mutually exclusive on MDA.
* Since reverse-video is used for cursors and selected areas,
* it takes precedence.
*/
if (ch & 0x0800) attr = 0x7000; /* reverse */
else if (ch & 0x0400) attr = 0x0100; /* underline */
return ((ch & 0x0200) << 2) | /* intensity */
(ch & 0x8000) | /* blink */
(ch & 0x00ff) | attr;
}
static u8 mdacon_build_attr(struct vc_data *c, u8 color, u8 intensity,
u8 blink, u8 underline, u8 reverse)
{
/* The attribute is just a bit vector:
*
* Bit 0..1 : intensity (0..2)
* Bit 2 : underline
* Bit 3 : reverse
* Bit 7 : blink
*/
return (intensity & 3) |
((underline & 1) << 2) |
((reverse & 1) << 3) |
((blink & 1) << 7);
}
static void mdacon_invert_region(struct vc_data *c, u16 *p, int count)
{
for (; count > 0; count--) {
scr_writew(scr_readw(p) ^ 0x0800, p);
p++;
}
}
#define MDA_ADDR(x,y) ((u16 *) mda_vram_base + (y)*mda_num_columns + (x))
static void mdacon_putc(struct vc_data *c, int ch, int y, int x)
{
scr_writew(mda_convert_attr(ch), MDA_ADDR(x, y));
}
static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
int count, int y, int x)
{
u16 *dest = MDA_ADDR(x, y);
for (; count > 0; count--) {
scr_writew(mda_convert_attr(scr_readw(s++)), dest++);
}
}
static void mdacon_clear(struct vc_data *c, int y, int x,
int height, int width)
{
u16 *dest = MDA_ADDR(x, y);
u16 eattr = mda_convert_attr(c->vc_video_erase_char);
if (width <= 0 || height <= 0)
return;
if (x==0 && width==mda_num_columns) {
scr_memsetw(dest, eattr, height*width*2);
} else {
for (; height > 0; height--, dest+=mda_num_columns)
scr_memsetw(dest, eattr, width*2);
}
}
static void mdacon_bmove(struct vc_data *c, int sy, int sx,
int dy, int dx, int height, int width)
{
u16 *src, *dest;
if (width <= 0 || height <= 0)
return;
if (sx==0 && dx==0 && width==mda_num_columns) {
scr_memmovew(MDA_ADDR(0,dy), MDA_ADDR(0,sy), height*width*2);
} else if (dy < sy || (dy == sy && dx < sx)) {
src = MDA_ADDR(sx, sy);
dest = MDA_ADDR(dx, dy);
for (; height > 0; height--) {
scr_memmovew(dest, src, width*2);
src += mda_num_columns;
dest += mda_num_columns;
}
} else {
src = MDA_ADDR(sx, sy+height-1);
dest = MDA_ADDR(dx, dy+height-1);
for (; height > 0; height--) {
scr_memmovew(dest, src, width*2);
src -= mda_num_columns;
dest -= mda_num_columns;
}
}
}
static int mdacon_switch(struct vc_data *c)
{
return 1; /* redrawing needed */
}
static int mdacon_set_palette(struct vc_data *c, unsigned char *table)
{
return -EINVAL;
}
static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
{
if (mda_type == TYPE_MDA) {
if (blank)
scr_memsetw((void *)mda_vram_base,
mda_convert_attr(c->vc_video_erase_char),
c->vc_screenbuf_size);
/* Tell console.c that it has to restore the screen itself */
return 1;
} else {
if (blank)
outb_p(0x00, mda_mode_port); /* disable video */
else
outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN,
mda_mode_port);
return 0;
}
}
static int mdacon_scrolldelta(struct vc_data *c, int lines)
{
return 0;
}
static void mdacon_cursor(struct vc_data *c, int mode)
{
if (mode == CM_ERASE) {
mda_set_cursor(mda_vram_len - 1);
return;
}
mda_set_cursor(c->vc_y*mda_num_columns*2 + c->vc_x*2);
switch (c->vc_cursor_type & 0x0f) {
case CUR_LOWER_THIRD: mda_set_cursor_size(10, 13); break;
case CUR_LOWER_HALF: mda_set_cursor_size(7, 13); break;
case CUR_TWO_THIRDS: mda_set_cursor_size(4, 13); break;
case CUR_BLOCK: mda_set_cursor_size(1, 13); break;
case CUR_NONE: mda_set_cursor_size(14, 13); break;
default: mda_set_cursor_size(12, 13); break;
}
}
static int mdacon_scroll(struct vc_data *c, int t, int b, int dir, int lines)
{
u16 eattr = mda_convert_attr(c->vc_video_erase_char);
if (!lines)
return 0;
if (lines > c->vc_rows) /* maximum realistic size */
lines = c->vc_rows;
switch (dir) {
case SM_UP:
scr_memmovew(MDA_ADDR(0,t), MDA_ADDR(0,t+lines),
(b-t-lines)*mda_num_columns*2);
scr_memsetw(MDA_ADDR(0,b-lines), eattr,
lines*mda_num_columns*2);
break;
case SM_DOWN:
scr_memmovew(MDA_ADDR(0,t+lines), MDA_ADDR(0,t),
(b-t-lines)*mda_num_columns*2);
scr_memsetw(MDA_ADDR(0,t), eattr, lines*mda_num_columns*2);
break;
}
return 0;
}
/*
* The console `switch' structure for the MDA based console
*/
static const struct consw mda_con = {
.owner = THIS_MODULE,
.con_startup = mdacon_startup,
.con_init = mdacon_init,
.con_deinit = mdacon_deinit,
.con_clear = mdacon_clear,
.con_putc = mdacon_putc,
.con_putcs = mdacon_putcs,
.con_cursor = mdacon_cursor,
.con_scroll = mdacon_scroll,
.con_bmove = mdacon_bmove,
.con_switch = mdacon_switch,
.con_blank = mdacon_blank,
.con_set_palette = mdacon_set_palette,
.con_scrolldelta = mdacon_scrolldelta,
.con_build_attr = mdacon_build_attr,
.con_invert_region = mdacon_invert_region,
};
int __init mda_console_init(void)
{
if (mda_first_vc > mda_last_vc)
return 1;
return take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
}
static void __exit mda_console_exit(void)
{
give_up_console(&mda_con);
}
module_init(mda_console_init);
module_exit(mda_console_exit);
MODULE_LICENSE("GPL");
