+++ /dev/null
-/*
- * 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/fs.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/console.h>
-#include <linux/string.h>
-#include <linux/kd.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 u16 *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 = 13;
-static int mda_last_vc = 16;
-
-static struct vc_data *mda_display_fg = NULL;
-
-module_param(mda_first_vc, int, 0);
-MODULE_PARM_DESC(mda_first_vc, "First virtual console. Default: 13");
-module_param(mda_last_vc, int, 0);
-MODULE_PARM_DESC(mda_last_vc, "Last virtual console. Default: 16");
-
-/* 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 mda_detect(void)
-{
- int count=0;
- u16 *p, p_save;
- u16 *q, q_save;
-
- /* do a memory check */
-
- p = mda_vram_base;
- q = mda_vram_base + 0x01000 / 2;
-
- 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 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 = (u16 *)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, bool 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,
- enum vc_intensity intensity,
- bool blink, bool underline, bool reverse,
- bool italic)
-{
- /* The attribute is just a bit vector:
- *
- * Bit 0..1 : intensity (0..2)
- * Bit 2 : underline
- * Bit 3 : reverse
- * Bit 7 : blink
- */
-
- return (intensity & VCI_MASK) |
- (underline << 2) |
- (reverse << 3) |
- (italic << 4) |
- (blink << 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++;
- }
-}
-
-static inline u16 *mda_addr(unsigned int x, unsigned int y)
-{
- return mda_vram_base + y * mda_num_columns + x;
-}
-
-static void mdacon_putcs(struct vc_data *c, const u16 *s, unsigned int count,
- unsigned int y, unsigned 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, unsigned int y, unsigned int x,
- unsigned int width)
-{
- u16 *dest = mda_addr(x, y);
- u16 eattr = mda_convert_attr(c->vc_video_erase_char);
-
- scr_memsetw(dest, eattr, width * 2);
-}
-
-static bool mdacon_switch(struct vc_data *c)
-{
- return true; /* redrawing needed */
-}
-
-static bool mdacon_blank(struct vc_data *c, enum vesa_blank_mode blank,
- bool mode_switch)
-{
- if (mda_type == TYPE_MDA) {
- if (blank)
- scr_memsetw(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 true;
- } 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 false;
- }
-}
-
-static void mdacon_cursor(struct vc_data *c, bool enable)
-{
- if (!enable) {
- mda_set_cursor(mda_vram_len - 1);
- return;
- }
-
- mda_set_cursor(c->state.y * mda_num_columns * 2 + c->state.x * 2);
-
- switch (CUR_SIZE(c->vc_cursor_type)) {
-
- 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 bool mdacon_scroll(struct vc_data *c, unsigned int t, unsigned int b,
- enum con_scroll dir, unsigned int lines)
-{
- u16 eattr = mda_convert_attr(c->vc_video_erase_char);
-
- if (!lines)
- return false;
-
- 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 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_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_DESCRIPTION("MDA based console driver");
-MODULE_LICENSE("GPL");
-
projects / thirdparty / kernel / linux.git / commitdiff
