mdacon.c
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- /*
- * 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/console_struct.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 spinlock_t mda_lock = SPIN_LOCK_UNLOCKED;
- /* 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_origin_loc=-1;
- 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_PARM(mda_first_vc, "1-255i");
- MODULE_PARM(mda_last_vc, "1-255i");
- /* 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_origin(unsigned int location)
- {
- if (mda_origin_loc == location)
- return;
- write_mda_w(location >> 1, 0x0c);
- mda_origin_loc = location;
- }
- 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 __init *mdacon_startup(void)
- {
- mda_num_columns = 80;
- mda_num_lines = 25;
- mda_vram_base = VGA_MAP_MEM(0xb0000);
- mda_vram_len = 0x01000;
- 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_con(mda_num_lines, mda_num_columns, c->vc_num);
- }
-
- /* make the first MDA console visible */
- if (mda_display_fg == NULL)
- mda_display_fg = c;
- MOD_INC_USE_COUNT;
- }
- static void mdacon_deinit(struct vc_data *c)
- {
- /* con_set_default_unimap(c->vc_num); */
- if (mda_display_fg == c)
- mda_display_fg = NULL;
- MOD_DEC_USE_COUNT;
- }
- 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)
- {
- 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_font_op(struct vc_data *c, struct console_font_op *op)
- {
- return -ENOSYS;
- }
- 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
- */
- const struct consw mda_con = {
- 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_font_op: mdacon_font_op,
- con_set_palette: mdacon_set_palette,
- con_scrolldelta: mdacon_scrolldelta,
- con_build_attr: mdacon_build_attr,
- con_invert_region: mdacon_invert_region,
- };
- void __init mda_console_init(void)
- {
- if (mda_first_vc > mda_last_vc)
- return;
- take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
- }
- #ifdef MODULE
- MODULE_LICENSE("GPL");
- int init_module(void)
- {
- mda_console_init();
- return 0;
- }
- void cleanup_module(void)
- {
- give_up_console(&mda_con);
- }
- #endif