Implement native VGA Support.

This code brings a rather complete set of VGA IO routines for whoever wants it.
These consist of the by now familiar read/write/mask sets. Due to the crazy
nature of VGA, an ancient standard with bits all over the place, it makes no
sense to define individual registers. You need a vga register spec at hand if
you want to do anything anyway. These IO routines are always exposed.

It also provides code to natively set up a 640x400 VGA textmode with an 8x16
font. The native VGA mode code is behind the OPTION_VGA option, as the font
really adds to the size of the compiled/compressed rom. The font is the one
also present in the linux kernel, but this file is unlicensed. Another copy of
this is also present in coreboot in the deprecated console/btext code.

The vga console code has been cleaned up, but it still has some TODO's left
open, but that's for when i finally have found the remaining issue with the
epia-m. Right now, it is important to get parts of my work out already and to
make the remainder managable again.

Signed-off-by: Luc Verhaegen <libv@skynet.be>
Acked-by: Peter Stuge <peter@stuge.se>

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4321 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

2 files changed, 94 insertions, 213 deletions

diff --git a/src/include/pc80/vga.h b/src/include/pc80/vga.h
index fd90db072b..e71a214d0b 100644
--- a/src/include/pc80/vga.h
+++ b/src/include/pc80/vga.h
@@ -1,228 +1,43 @@
 /*
+ * Copyright (C)  2007-2009  Luc Verhaegen <libv@skynet.be>
  *
- * modified
- * by Steve M. Gehlbach <steve@kesa.com>
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
  *
- * Originally  from linux/drivers/video/vga16.c by
- * Ben Pfaff <pfaffben@debian.org> and Petr Vandrovec <VANDROVE@vc.cvut.cz>
- * Copyright 1999 Ben Pfaff <pfaffben@debian.org> and Petr Vandrovec <VANDROVE@vc.cvut.cz>
- * Based on VGA info at http://www.goodnet.com/~tinara/FreeVGA/home.htm
- * Based on VESA framebuffer (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
- *
- */ 
-
-#ifndef VGA_H_INCL
-#define VGA_H_INCL 1
-
-#include <arch/io.h>
-
-#define u8 unsigned char
-#define u16 unsigned short
-#define u32 unsigned int
-#define __u32 u32
-
-#define VERROR -1
-#define CHAR_HEIGHT 16
-#define LINES 25
-#define COLS 80
-
-// macros for writing to vga regs
-#define write_crtc(data,addr) outb(addr,CRT_IC); outb(data,CRT_DC)
-#define write_att(data,addr) inb(IS1_RC); inb(0x80); outb(addr,ATT_IW); inb(0x80); outb(data,ATT_IW); inb(0x80)
-#define write_seq(data,addr) outb(addr,SEQ_I); outb(data,SEQ_D)
-#define write_gra(data,addr) outb(addr,GRA_I); outb(data,GRA_D)
-u8 read_seq_b(u16 addr);
-u8 read_gra_b(u16 addr);
-u8 read_crtc_b(u16 addr);
-u8 read_att_b(u16 addr);
-
-
-#ifdef VGA_HARDWARE_FIXUP
-void vga_hardware_fixup(void);
-#else
-#define vga_hardware_fixup() do{} while(0)
-#endif
-
-#define SYNC_HOR_HIGH_ACT    1       /* horizontal sync high active  */
-#define SYNC_VERT_HIGH_ACT   2       /* vertical sync high active    */
-#define SYNC_EXT             4       /* external sync                */
-#define SYNC_COMP_HIGH_ACT   8       /* composite sync high active   */
-#define SYNC_BROADCAST       16      /* broadcast video timings      */
-                                        /* vtotal = 144d/288n/576i => PAL  */
-                                        /* vtotal = 121d/242n/484i => NTSC */
-
-#define SYNC_ON_GREEN        32      /* sync on green */
-
-#define VMODE_NONINTERLACED  0       /* non interlaced */
-#define VMODE_INTERLACED     1       /* interlaced   */
-#define VMODE_DOUBLE         2       /* double scan */
-#define VMODE_MASK           255
-
-#define VMODE_YWRAP          256     /* ywrap instead of panning     */
-#define VMODE_SMOOTH_XPAN    512     /* smooth xpan possible (internally used) */
-#define VMODE_CONUPDATE      512     /* don't update x/yoffset       */
-
-/* VGA data register ports */
-#define CRT_DC  0x3D5           /* CRT Controller Data Register - color emulation */
-#define CRT_DM  0x3B5           /* CRT Controller Data Register - mono emulation */
-#define ATT_R   0x3C1           /* Attribute Controller Data Read Register */
-#define GRA_D   0x3CF           /* Graphics Controller Data Register */
-#define SEQ_D   0x3C5           /* Sequencer Data Register */
-
-#define MIS_R   0x3CC           // Misc Output Read Register
-#define MIS_W   0x3C2           // Misc Output Write Register
-
-#define IS1_RC  0x3DA           /* Input Status Register 1 - color emulation */
-#define IS1_RM  0x3BA           /* Input Status Register 1 - mono emulation */
-#define PEL_D   0x3C9           /* PEL Data Register */
-#define PEL_MSK 0x3C6           /* PEL mask register */
-
-/* EGA-specific registers */
-#define GRA_E0  0x3CC           /* Graphics enable processor 0 */
-#define GRA_E1  0x3CA           /* Graphics enable processor 1 */
-
-
-/* VGA index register ports */
-#define CRT_IC  0x3D4           /* CRT Controller Index - color emulation */
-#define CRT_IM  0x3B4           /* CRT Controller Index - mono emulation */
-#define ATT_IW  0x3C0           /* Attribute Controller Index & Data Write Register */
-#define GRA_I   0x3CE           /* Graphics Controller Index */
-#define SEQ_I   0x3C4           /* Sequencer Index */
-#define PEL_IW  0x3C8           /* PEL Write Index */
-#define PEL_IR  0x3C7           /* PEL Read Index */
-
-/* standard VGA indexes max counts */
-#define CRTC_C   25              /* 25 CRT Controller Registers sequentially set*/
-								 // the remainder are not in the par array
-#define ATT_C   21              /* 21 Attribute Controller Registers */
-#define GRA_C   9               /* 9  Graphics Controller Registers */
-#define SEQ_C   5               /* 5  Sequencer Registers */
-#define MIS_C   1               /* 1  Misc Output Register */
-
-#define CRTC_H_TOTAL            0
-#define CRTC_H_DISP             1
-#define CRTC_H_BLANK_START      2
-#define CRTC_H_BLANK_END        3
-#define CRTC_H_SYNC_START       4
-#define CRTC_H_SYNC_END         5
-#define CRTC_V_TOTAL            6
-#define CRTC_OVERFLOW           7
-#define CRTC_PRESET_ROW         8
-#define CRTC_MAX_SCAN           9
-#define CRTC_CURSOR_START       0x0A
-#define CRTC_CURSOR_END         0x0B
-#define CRTC_START_HI           0x0C
-#define CRTC_START_LO           0x0D
-#define CRTC_CURSOR_HI          0x0E
-#define CRTC_CURSOR_LO          0x0F
-#define CRTC_V_SYNC_START       0x10
-#define CRTC_V_SYNC_END         0x11
-#define CRTC_V_DISP_END         0x12
-#define CRTC_OFFSET             0x13
-#define CRTC_UNDERLINE          0x14
-#define CRTC_V_BLANK_START      0x15
-#define CRTC_V_BLANK_END        0x16
-#define CRTC_MODE               0x17
-#define CRTC_LINE_COMPARE       0x18
-
-#define ATC_MODE                0x10
-#define ATC_OVERSCAN            0x11
-#define ATC_PLANE_ENABLE        0x12
-#define ATC_PEL                 0x13
-#define ATC_COLOR_PAGE          0x14
-
-#define SEQ_CLOCK_MODE          0x01
-#define SEQ_PLANE_WRITE         0x02
-#define SEQ_CHARACTER_MAP       0x03
-#define SEQ_MEMORY_MODE         0x04
-
-#define GDC_SR_VALUE            0x00
-#define GDC_SR_ENABLE           0x01
-#define GDC_COMPARE_VALUE       0x02
-#define GDC_DATA_ROTATE         0x03
-#define GDC_PLANE_READ          0x04
-#define GDC_MODE                0x05
-#define GDC_MISC                0x06
-#define GDC_COMPARE_MASK        0x07
-#define GDC_BIT_MASK            0x08
-
-// text attributes
-#define VGA_ATTR_CLR_RED 0x4
-#define VGA_ATTR_CLR_GRN 0x2
-#define VGA_ATTR_CLR_BLU 0x1
-#define VGA_ATTR_CLR_YEL (VGA_ATTR_CLR_RED | VGA_ATTR_CLR_GRN)
-#define VGA_ATTR_CLR_CYN (VGA_ATTR_CLR_GRN | VGA_ATTR_CLR_BLU)
-#define VGA_ATTR_CLR_MAG (VGA_ATTR_CLR_BLU | VGA_ATTR_CLR_RED)
-#define VGA_ATTR_CLR_BLK 0
-#define VGA_ATTR_CLR_WHT (VGA_ATTR_CLR_RED | VGA_ATTR_CLR_GRN | VGA_ATTR_CLR_BLU)
-#define VGA_ATTR_BNK     0x80
-#define VGA_ATTR_ITN     0x08
-
-/*
- * vga register parameters
- * these are copied to the 
- * registers.
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
  *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
-struct vga_par {
-        u8 crtc[CRTC_C];
-        u8 atc[ATT_C];
-        u8 gdc[GRA_C];
-        u8 seq[SEQ_C];
-        u8 misc; // the misc register, MIS_W
-        u8 vss;
-};
-
 
-/* Interpretation of offset for color fields: All offsets are from the right,
- * inside a "pixel" value, which is exactly 'bits_per_pixel' wide (means: you
- * can use the offset as right argument to <<). A pixel afterwards is a bit
- * stream and is written to video memory as that unmodified. This implies
- * big-endian byte order if bits_per_pixel is greater than 8.
- */
-struct fb_bitfield {
-        __u32 offset;                   /* beginning of bitfield        */
-        __u32 length;                   /* length of bitfield           */
-        __u32 msb_right;                /* != 0 : Most significant bit is */ 
-                                        /* right */ 
-};
+#ifndef VGA_H
+#define VGA_H
 
-struct screeninfo {
-        __u32 xres;                     /* visible resolution           */
-        __u32 yres;
-        __u32 xres_virtual;             /* virtual resolution           */
-        __u32 yres_virtual;
-        __u32 xoffset;                  /* offset from virtual to visible */
-        __u32 yoffset;                  /* resolution                   */
+#define VGA_FB 0xB8000
+#define VGA_FB_SIZE 0x4000 /* char + attr = word sized so 0x8000 / 2 */
+#define VGA_COLUMNS 80
+#define VGA_LINES 25
 
-        __u32 bits_per_pixel;           /* guess what                   */
-        __u32 grayscale;                /* != 0 Graylevels instead of colors */
+#if (CONFIG_VGA == 1)
 
-        struct fb_bitfield red;         /* bitfield in fb mem if true color, */
-        struct fb_bitfield green;       /* else only length is significant */
-        struct fb_bitfield blue;
-        struct fb_bitfield transp;      /* transparency                 */      
+void vga_io_init(void);
 
-        __u32 nonstd;                   /* != 0 Non standard pixel format */
+void vga_textmode_init(void);
 
-        __u32 activate;                 /* see FB_ACTIVATE_*            */
+void vga_cursor_enable(int enable);
+void vga_cursor_reset(void);
+void vga_cursor_set(unsigned int line, unsigned int character);
 
-        __u32 height;                   /* height of picture in mm    */
-        __u32 width;                    /* width of picture in mm     */
+void vga_frame_set(unsigned int line, unsigned int character);
 
-        __u32 accel_flags;              /* acceleration flags (hints)   */
+void vga_line_write(unsigned int line, const char *string);
 
-        /* Timing: All values in pixclocks, except pixclock (of course) */
-        __u32 pixclock;                 /* pixel clock in ps (pico seconds) */
-        __u32 left_margin;              /* time from sync to picture    */
-        __u32 right_margin;             /* time from picture to sync    */
-        __u32 upper_margin;             /* time from sync to picture    */
-        __u32 lower_margin;
-        __u32 hsync_len;                /* length of horizontal sync    */
-        __u32 vsync_len;                /* length of vertical sync      */
-        __u32 sync;                     /* sync polarity                */
-        __u32 vmode;                    /* interlaced etc				*/
-        __u32 reserved[6];              /* Reserved for future compatibility */
-};
+#endif /* (CONFIG_VGA == 1) */
 
-#endif
+#endif /* VGA_H */
diff --git a/src/include/pc80/vga_io.h b/src/include/pc80/vga_io.h
new file mode 100644
index 0000000000..64c62c7697
--- /dev/null
+++ b/src/include/pc80/vga_io.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C)  2007  Luc Verhaegen <libv@skynet.be>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef VGA_IO_H
+#define VGA_IO_H
+
+/*
+ * All IO necessary to poke VGA registers.
+ */
+
+/* VGA Enable */
+unsigned char vga_enable_read(void);
+void vga_enable_write(unsigned char value);
+void vga_enable_mask(unsigned char value, unsigned char mask);
+
+/* Miscellaneous register */
+unsigned char vga_misc_read(void);
+void vga_misc_write(unsigned char value);
+void vga_misc_mask(unsigned char value, unsigned char mask);
+
+/* Sequencer registers. */
+unsigned char vga_sr_read(unsigned char index);
+void vga_sr_write(unsigned char index, unsigned char value);
+void vga_sr_mask(unsigned char index, unsigned char value, unsigned char mask);
+
+/* CR registers. */
+unsigned char vga_cr_read(unsigned char index);
+void vga_cr_write(unsigned char index, unsigned char value);
+void vga_cr_mask(unsigned char index, unsigned char value, unsigned char mask);
+
+/* Attribute registers. */
+unsigned char vga_ar_read(unsigned char index);
+void vga_ar_write(unsigned char index, unsigned char value);
+void vga_ar_mask(unsigned char index, unsigned char value, unsigned char mask);
+
+/* Graphics registers. */
+unsigned char vga_gr_read(unsigned char index);
+void vga_gr_write(unsigned char index, unsigned char value);
+void vga_gr_mask(unsigned char index, unsigned char value, unsigned char mask);
+
+/* DAC functions. */
+void vga_palette_enable(void);
+void vga_palette_disable(void);
+unsigned char vga_dac_mask_read(void);
+void vga_dac_mask_write(unsigned char mask);
+void vga_dac_read_address(unsigned char address);
+void vga_dac_write_address(unsigned char address);
+unsigned char vga_dac_data_read(void);
+void vga_dac_data_write(unsigned char data);
+
+#endif /* VGA_IO_H */