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