diff options
Diffstat (limited to 'drivers/video/console/mdacon.c')
| -rw-r--r-- | drivers/video/console/mdacon.c | 607 |
1 files changed, 607 insertions, 0 deletions
diff --git a/drivers/video/console/mdacon.c b/drivers/video/console/mdacon.c new file mode 100644 index 000000000..296e94561 --- /dev/null +++ b/drivers/video/console/mdacon.c @@ -0,0 +1,607 @@ +/* + * 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 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 = 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 = (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 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, u8 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 & 3) | + ((underline & 1) << 2) | + ((reverse & 1) << 3) | + (!!italic << 4) | + ((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) +{ + 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"); + |