patch-2.1.124 linux/drivers/video/vgafb.c
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- Lines: 765
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.1.123/linux/drivers/video/vgafb.c
- Orig date:
Sun Jul 26 11:57:18 1998
diff -u --recursive --new-file v2.1.123/linux/drivers/video/vgafb.c linux/drivers/video/vgafb.c
@@ -1,764 +0,0 @@
-/*
- * linux/drivers/video/vgafb.c -- VGA frame buffer device
- *
- * Created 28 Mar 1998 by Geert Uytterhoeven
- * Hardware cursor support added on 14 Apr 1998 by Emmanuel Marty
- *
- * This file is heavily based on vgacon.c. Read about its contributors there.
- *
- * 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.
- */
-
-
-
-
-/* KNOWN PROBLEMS/TO DO ===================================================== *
- *
- * - add support for loadable fonts and VESA blanking
- *
- * - for now only VGA _text_ mode is supported
- *
- * KNOWN PROBLEMS/TO DO ==================================================== */
-
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/tty.h>
-#include <linux/malloc.h>
-#include <linux/vmalloc.h>
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-#include <linux/fb.h>
-#include <linux/ioport.h>
-#include <linux/init.h>
-#include <linux/selection.h>
-#include <linux/console.h>
-#include <linux/vt_kern.h>
-
-#include <asm/io.h>
-#include <asm/uaccess.h>
-
-#include "fbcon.h"
-#include "fbcon-vga.h"
-
-
-#define BLANK 0x0020
-
-#define CAN_LOAD_EGA_FONTS /* undefine if the user must not do this */
-#define CAN_LOAD_PALETTE /* undefine if the user must not do this */
-
-#define dac_reg (0x3c8)
-#define dac_val (0x3c9)
-
-#ifdef __powerpc__
-#define VGA_OFFSET _ISA_MEM_BASE;
-#else
-#define VGA_OFFSET 0x0
-#endif
-
-
-static int currcon = 0;
-static struct display disp;
-static struct fb_info fb_info;
-static struct { u_char red, green, blue, pad; } palette[16];
-
-static struct fb_fix_screeninfo fb_fix = { { 0, } };
-static struct fb_var_screeninfo fb_var = { 0, };
-
-
-/* Description of the hardware situation */
-static unsigned char vga_video_type;
-static unsigned long vga_video_mem_base; /* Base of video memory */
-static unsigned long vga_video_mem_term; /* End of video memory */
-static u16 vga_video_port_reg; /* Video register select port */
-static u16 vga_video_port_val; /* Video register value port */
-static unsigned long vga_video_num_columns; /* Number of text columns */
-static unsigned long vga_video_num_lines; /* Number of text lines */
-static int vga_can_do_color = 0;
-
-
- /*
- * VGA screen access
- */
-
-static inline void vga_writew(u16 val, u16 *addr)
-{
-#ifdef __powerpc__
- st_le16(addr, val);
-#else
- writew(val, (unsigned long)addr);
-#endif /* !__powerpc__ */
-}
-
-static inline u16 vga_readw(u16 *addr)
-{
-#ifdef __powerpc__
- return ld_le16(addr);
-#else
- return readw((unsigned long)addr);
-#endif /* !__powerpc__ */
-}
-
-/*
- * By replacing the four outb_p with two back to back outw, we can reduce
- * the window of opportunity to see text mislocated to the RHS of the
- * console during heavy scrolling activity. However there is the remote
- * possibility that some pre-dinosaur hardware won't like the back to back
- * I/O. Since the Xservers get away with it, we should be able to as well.
- */
-static inline void write_vga(unsigned char reg, unsigned int val)
-{
-#ifndef SLOW_VGA
- unsigned int v1, v2;
-
- v1 = reg + (val & 0xff00);
- v2 = reg + 1 + ((val << 8) & 0xff00);
- outw(v1, vga_video_port_reg);
- outw(v2, vga_video_port_reg);
-#else
- outb_p(reg, vga_video_port_reg);
- outb_p(val >> 8, vga_video_port_val);
- outb_p(reg+1, vga_video_port_reg);
- outb_p(val & 0xff, vga_video_port_val);
-#endif
-}
-
-static inline void vga_set_origin(unsigned short location)
-{
- write_vga(12, location >> 1);
-}
-
-static inline void vga_set_cursor(int location)
-{
- write_vga(14, location >> 1);
-}
-
-static void vga_set_split(unsigned short linenum)
-{
- unsigned long flags;
- unsigned char overflow, fontsize;
-
- if (vga_video_type != VIDEO_TYPE_VGAC) {
- return;
- }
-
- save_flags(flags); cli();
-
- outb_p(0x07, vga_video_port_reg);
- overflow = inb_p(vga_video_port_val);
-
- outb_p(0x09, vga_video_port_reg);
- fontsize = inb_p(vga_video_port_val);
-
- overflow &= ~0x10; overflow |= (linenum & 0x100) ? 0x10 : 0;
- fontsize &= ~0x40; fontsize |= (linenum & 0x200) ? 0x40 : 0;
- linenum &= 0xff;
-
- outb_p(0x18, vga_video_port_reg);
- outb_p(linenum, vga_video_port_val);
-
- outb_p(0x07, vga_video_port_reg);
- outb_p(overflow, vga_video_port_val);
-
- outb_p(0x09, vga_video_port_reg);
- outb_p(fontsize, vga_video_port_val);
-
- restore_flags(flags);
-}
-
-static inline void vga_set_palreg(u_int regno, u_int red,
- u_int green, u_int blue)
-{
- unsigned long flags;
-
- save_flags(flags); cli();
-
- outb_p(regno, dac_reg);
- outb_p(red, dac_val);
- outb_p(green, dac_val);
- outb_p(blue, dac_val);
-
- restore_flags(flags);
-}
-
-
- /*
- * Interface used by the world
- */
-
-static int vgafb_open(struct fb_info *info, int user);
-static int vgafb_release(struct fb_info *info, int user);
-static int vgafb_get_fix(struct fb_fix_screeninfo *fix, int con,
- struct fb_info *info);
-static int vgafb_get_var(struct fb_var_screeninfo *var, int con,
- struct fb_info *info);
-static int vgafb_set_var(struct fb_var_screeninfo *var, int con,
- struct fb_info *info);
-static int vgafb_pan_display(struct fb_var_screeninfo *var, int con,
- struct fb_info *info);
-static int vgafb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
- struct fb_info *info);
-static int vgafb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
- struct fb_info *info);
-static int vgafb_ioctl(struct inode *inode, struct file *file, u_int cmd,
- u_long arg, int con, struct fb_info *info);
-
-
- /*
- * Interface to the low level console driver
- */
-
-void vgafb_init(void);
-void vgafb_setup(char *options, int *ints);
-static int vgafbcon_switch(int con, struct fb_info *info);
-static int vgafbcon_updatevar(int con, struct fb_info *info);
-static void vgafbcon_blank(int blank, struct fb_info *info);
-
-
- /*
- * VGA text console with hardware cursor
- */
-
-static struct display_switch fbcon_vgafb;
-
-
- /*
- * Internal routines
- */
-
-static int vgafb_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
- u_int *transp, struct fb_info *info);
-static int vgafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
- u_int transp, struct fb_info *info);
-static void do_install_cmap(int con, struct fb_info *info);
-
-
-static struct fb_ops vgafb_ops = {
- vgafb_open, vgafb_release, vgafb_get_fix, vgafb_get_var, vgafb_set_var,
- vgafb_get_cmap, vgafb_set_cmap, vgafb_pan_display, vgafb_ioctl
-};
-
-
- /*
- * Open/Release the frame buffer device
- */
-
-static int vgafb_open(struct fb_info *info, int user)
-
-{
- /*
- * Nothing, only a usage count for the moment
- */
-
- MOD_INC_USE_COUNT;
- return(0);
-}
-
-static int vgafb_release(struct fb_info *info, int user)
-{
- MOD_DEC_USE_COUNT;
- return(0);
-}
-
-
- /*
- * Get the Fixed Part of the Display
- */
-
-static int vgafb_get_fix(struct fb_fix_screeninfo *fix, int con,
- struct fb_info *info)
-{
- memcpy(fix, &fb_fix, sizeof(fb_fix));
- return 0;
-}
-
-
- /*
- * Get the User Defined Part of the Display
- */
-
-static int vgafb_get_var(struct fb_var_screeninfo *var, int con,
- struct fb_info *info)
-{
- memcpy(var, &fb_var, sizeof(fb_var));
- return 0;
-}
-
-
- /*
- * Set the User Defined Part of the Display
- */
-
-static int vgafb_set_var(struct fb_var_screeninfo *var, int con,
- struct fb_info *info)
-{
- struct display *display;
- int oldbpp = -1, err;
-
- if (con >= 0)
- display = &fb_display[con];
- else
- display = &disp; /* used during initialization */
-
- if (var->xres > fb_var.xres || var->yres > fb_var.yres ||
- var->xres_virtual > fb_var.xres_virtual ||
- var->yres_virtual > fb_var.yres_virtual ||
- var->bits_per_pixel > fb_var.bits_per_pixel ||
- var->nonstd || !(var->accel_flags & FB_ACCELF_TEXT) ||
- (var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
- return -EINVAL;
- memcpy(var, &fb_var, sizeof(fb_var));
-
- if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
- oldbpp = display->var.bits_per_pixel;
- display->var = *var;
- vga_set_origin(var->yoffset/video_font_height*fb_fix.line_length);
- }
-
- if (oldbpp != var->bits_per_pixel) {
- if ((err = fb_alloc_cmap(&display->cmap, 0, 0)))
- return err;
- do_install_cmap(con, info);
- }
- return 0;
-}
-
-
- /*
- * Pan or Wrap the Display
- *
- * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
- */
-
-static int vgafb_pan_display(struct fb_var_screeninfo *var, int con,
- struct fb_info *info)
-{
- if (var->xoffset || var->yoffset+var->yres > var->yres_virtual)
- return -EINVAL;
-
- vga_set_origin(var->yoffset/video_font_height*fb_fix.line_length);
- return 0;
-}
-
-
- /*
- * Get the Colormap
- */
-
-static int vgafb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
- struct fb_info *info)
-{
- if (con == currcon) /* current console? */
- return fb_get_cmap(cmap, &fb_display[con].var, kspc, vgafb_getcolreg,
- info);
- else if (fb_display[con].cmap.len) /* non default colormap? */
- fb_copy_cmap(&fb_display[con].cmap, cmap, kspc ? 0 : 2);
- else
- fb_copy_cmap(fb_default_cmap(1<<fb_display[con].var.bits_per_pixel),
- cmap, kspc ? 0 : 2);
- return 0;
-}
-
-
- /*
- * Set the Colormap
- */
-
-static int vgafb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
- struct fb_info *info)
-{
- int err;
-
- if (!fb_display[con].cmap.len) { /* no colormap allocated? */
- if ((err = fb_alloc_cmap(&fb_display[con].cmap,
- 1<<fb_display[con].var.bits_per_pixel, 0)))
- return err;
- }
- if (con == currcon) { /* current console? */
- err = fb_set_cmap(cmap, &fb_display[con].var, kspc, vgafb_setcolreg,
- info);
- return err;
- } else
- fb_copy_cmap(cmap, &fb_display[con].cmap, kspc ? 0 : 1);
- return 0;
-}
-
-
-static int vgafb_ioctl(struct inode *inode, struct file *file, u_int cmd,
- u_long arg, int con, struct fb_info *info)
-{
- return -EINVAL;
-}
-
-
- /*
- * Move hardware vga cursor
- */
-
-static void fbcon_vgafb_cursor(struct display *p, int mode, int x, int y)
-{
- switch (mode) {
- case CM_ERASE:
- vga_set_cursor(vga_video_mem_term - vga_video_mem_base - 1);
- break;
-
- case CM_MOVE:
- case CM_DRAW:
- vga_set_cursor(y*p->next_line + (x << 1));
- break;
- }
-}
-
-
- /*
- * Initialisation
- */
-
-__initfunc(void vgafb_init(void))
-{
- u16 saved;
- u16 *p;
-
- if (screen_info.orig_video_isVGA == VIDEO_TYPE_VLFB)
- return;
-
- vga_video_num_lines = ORIG_VIDEO_LINES;
- vga_video_num_columns = ORIG_VIDEO_COLS;
-
- if (ORIG_VIDEO_MODE == 7) { /* Is this a monochrome display? */
- vga_video_mem_base = 0xb0000 + VGA_OFFSET;
- vga_video_port_reg = 0x3b4;
- vga_video_port_val = 0x3b5;
- if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10) {
- vga_video_type = VIDEO_TYPE_EGAM;
- vga_video_mem_term = 0xb8000 + VGA_OFFSET;
- strcpy(fb_fix.id, "EGA+");
- request_region(0x3b0, 16, "ega");
- } else {
- vga_video_type = VIDEO_TYPE_MDA;
- vga_video_mem_term = 0xb1000 + VGA_OFFSET;
- strcpy(fb_fix.id, "*MDA");
- request_region(0x3b0, 12, "mda");
- request_region(0x3bf, 1, "mda");
- }
- } else { /* If not, it is color. */
- vga_can_do_color = 1;
- vga_video_mem_base = 0xb8000 + VGA_OFFSET;
- vga_video_port_reg = 0x3d4;
- vga_video_port_val = 0x3d5;
- if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10) {
- int i;
-
- vga_video_mem_term = 0xc0000 + VGA_OFFSET;
-
- if (!ORIG_VIDEO_ISVGA) {
- vga_video_type = VIDEO_TYPE_EGAC;
- strcpy(fb_fix.id, "EGA");
- request_region(0x3c0, 32, "ega");
- } else {
- vga_video_type = VIDEO_TYPE_VGAC;
- strcpy(fb_fix.id, "VGA+");
- request_region(0x3c0, 32, "vga+");
-
-#ifdef VGA_CAN_DO_64KB
- /*
- * get 64K rather than 32K of video RAM.
- * This doesn't actually work on all "VGA"
- * controllers (it seems like setting MM=01
- * and COE=1 isn't necessarily a good idea)
- */
- vga_video_mem_base = 0xa0000 + VGA_OFFSET;
- vga_video_mem_term = 0xb0000 + VGA_OFFSET;
- outb_p(6, 0x3ce);
- outb_p(6, 0x3cf);
-#endif
-
- /*
- * Normalise the palette registers, to point
- * the 16 screen colours to the first 16
- * DAC entries.
- */
-
- for (i = 0; i < 16; i++) {
- inb_p(0x3da);
- outb_p(i, 0x3c0);
- outb_p(i, 0x3c0);
- }
- outb_p(0x20, 0x3c0);
-
- /* now set the DAC registers back to their
- * default values */
-
- for (i = 0; i < 16; i++) {
- vga_set_palreg(color_table[i], default_red[i],
- default_grn[i], default_blu[i]);
- }
- }
- } else {
- vga_video_type = VIDEO_TYPE_CGA;
- vga_video_mem_term = 0xba000 + VGA_OFFSET;
- strcpy(fb_fix.id, "*CGA");
- request_region(0x3d4, 2, "cga");
- }
- }
-
- /*
- * Find out if there is a graphics card present.
- * Are there smarter methods around?
- */
- p = (u16 *)vga_video_mem_base;
- saved = vga_readw(p);
- vga_writew(0xAA55, p);
- if (vga_readw(p) != 0xAA55) {
- vga_writew(saved, p);
- return;
- }
- vga_writew(0x55AA, p);
- if (vga_readw(p) != 0x55AA) {
- vga_writew(saved, p);
- return;
- }
- vga_writew(saved, p);
-
- if (vga_video_type == VIDEO_TYPE_VGAC
- || vga_video_type == VIDEO_TYPE_EGAC
- || vga_video_type == VIDEO_TYPE_EGAM) {
- video_font_height = ORIG_VIDEO_POINTS;
- } else {
- video_font_height = 16;
- }
-
- /* This may be suboptimal but is a safe bet - go with it */
- video_scan_lines = video_font_height * vga_video_num_lines;
-
- fb_fix.smem_start = (char *) vga_video_mem_base;
- fb_fix.smem_len = vga_video_mem_term - vga_video_mem_base;
- fb_fix.type = FB_TYPE_TEXT;
- fb_fix.type_aux = vga_can_do_color ? FB_AUX_TEXT_CGA : FB_AUX_TEXT_MDA;
- fb_fix.visual = FB_VISUAL_PSEUDOCOLOR;
- fb_fix.xpanstep = 0;
- fb_fix.ypanstep = video_font_height;
- fb_fix.ywrapstep = 0;
- fb_fix.line_length = 2*vga_video_num_columns;
- fb_fix.mmio_start = NULL;
- fb_fix.mmio_len = 0;
- fb_fix.accel = FB_ACCEL_NONE;
-
- fb_var.xres = vga_video_num_columns*8;
- fb_var.yres = vga_video_num_lines*video_font_height;
- fb_var.xres_virtual = fb_var.xres;
- /* the cursor is put at the end of the video memory, hence the -2 */
- fb_var.yres_virtual = ((fb_fix.smem_len-2)/fb_fix.line_length)*
- video_font_height;
-
- fb_var.xoffset = fb_var.yoffset = 0;
- fb_var.bits_per_pixel = vga_can_do_color ? 4 : 1;
- fb_var.grayscale = !vga_can_do_color;
- fb_var.red.offset = 0;
- fb_var.red.length = 6;
- fb_var.red.msb_right = 0;
- fb_var.green.offset = 0;
- fb_var.green.length = 6;
- fb_var.green.msb_right = 0;
- fb_var.blue.offset = 0;
- fb_var.blue.length = 6;
- fb_var.blue.msb_right = 0;
- fb_var.transp.offset = 0;
- fb_var.transp.length = 0;
- fb_var.transp.msb_right = 0;
- fb_var.nonstd = 0;
- fb_var.activate = 0;
- fb_var.height = fb_var.width = -1;
- fb_var.accel_flags = FB_ACCELF_TEXT;
- fb_var.pixclock = 39722; /* 25.175 MHz */
- fb_var.left_margin = 40;
- fb_var.right_margin = 24;
- fb_var.upper_margin = 39;
- fb_var.lower_margin = 9;
- fb_var.hsync_len = 96;
- fb_var.vsync_len = 2;
- fb_var.sync = 0;
- fb_var.vmode = FB_VMODE_NONINTERLACED;
-
- disp.var = fb_var;
- disp.cmap.start = 0;
- disp.cmap.len = 0;
- disp.cmap.red = NULL;
- disp.cmap.green = NULL;
- disp.cmap.blue = NULL;
- disp.cmap.transp = NULL;
-
-#ifdef __i386__
- disp.screen_base = ioremap((unsigned long) fb_fix.smem_start,
- fb_fix.smem_len);
-#else
- disp.screen_base = bus_to_virt((unsigned long) fb_fix.smem_start);
-#endif
- disp.visual = fb_fix.visual;
- disp.type = fb_fix.type;
- disp.type_aux = fb_fix.type_aux;
- disp.ypanstep = fb_fix.ypanstep;
- disp.ywrapstep = fb_fix.ywrapstep;
- disp.line_length = fb_fix.line_length;
- disp.can_soft_blank = vga_can_do_color;
- disp.inverse = 0;
- disp.dispsw = &fbcon_vgafb;
-
- strcpy(fb_info.modename, fb_fix.id);
- fb_info.node = -1;
- fb_info.fbops = &vgafb_ops;
- fb_info.disp = &disp;
- fb_info.fontname[0] = '\0';
- fb_info.changevar = NULL;
- fb_info.switch_con = &vgafbcon_switch;
- fb_info.updatevar = &vgafbcon_updatevar;
- fb_info.blank = &vgafbcon_blank;
-
- vgafb_set_var(&fb_var, -1, &fb_info);
-
- if (register_framebuffer(&fb_info) < 0)
- return;
-
- printk("fb%d: VGA frame buffer device, using %dK of video memory\n",
- GET_FB_IDX(fb_info.node), fb_fix.smem_len>>10);
-}
-
-__initfunc(void vgafb_setup(char *options, int *ints))
-{
- /* nothing yet */
-}
-
- /*
- * Update the `var' structure (called by fbcon.c)
- */
-
-static int vgafbcon_updatevar(int con, struct fb_info *info)
-{
- if (con == currcon) {
- struct fb_var_screeninfo *var = &fb_display[currcon].var;
-
- /* hardware scrolling */
-
- vga_set_origin(var->yoffset / video_font_height *
- fb_fix.line_length);
-
- vga_set_split(var->yres - ((var->vmode & FB_VMODE_YWRAP) ?
- var->yoffset+1 : 0));
- }
-
- return 0;
-}
-
-static int vgafbcon_switch(int con, struct fb_info *info)
-{
- /* Do we have to save the colormap? */
- if (fb_display[currcon].cmap.len)
- fb_get_cmap(&fb_display[currcon].cmap, &fb_display[currcon].var, 1,
- vgafb_getcolreg, info);
-
- currcon = con;
- /* Install new colormap */
- do_install_cmap(con, info);
- vgafbcon_updatevar(con, info);
- return 0;
-}
-
- /*
- * Blank the display.
- */
-
-static void vgafbcon_blank(int blank, struct fb_info *info)
-{
- int i;
-
- if (blank)
- for (i = 0; i < 16; i++) {
- vga_set_palreg(i, 0, 0, 0);
- }
- else
- for (i = 0; i < 16; i++) {
- vga_set_palreg(i, palette[i].red, palette[i].green,
- palette[i].blue);
- }
-}
-
-
- /*
- * Read a single color register and split it into
- * colors/transparent. Return != 0 for invalid regno.
- */
-
-static int vgafb_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
- u_int *transp, struct fb_info *info)
-{
- if (regno > 15)
- return 1;
- *red = palette[regno].red;
- *green = palette[regno].green;
- *blue = palette[regno].blue;
- return 0;
-}
-
-
- /*
- * Set a single color register. The values supplied are already
- * rounded down to the hardware's capabilities (according to the
- * entries in the var structure). Return != 0 for invalid regno.
- */
-
-static int vgafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
- u_int transp, struct fb_info *info)
-{
- if (regno > 15)
- return 1;
- palette[regno].red = red;
- palette[regno].green = green;
- palette[regno].blue = blue;
-
- vga_set_palreg(regno, red, green, blue);
-
- return 0;
-}
-
-static void do_install_cmap(int con, struct fb_info *info)
-{
- if (con != currcon)
- return;
- if (fb_display[con].cmap.len)
- fb_set_cmap(&fb_display[con].cmap, &fb_display[con].var, 1,
- vgafb_setcolreg, info);
- else
- fb_set_cmap(fb_default_cmap(1<<fb_display[con].var.bits_per_pixel),
- &fb_display[con].var, 1, vgafb_setcolreg,
- info);
-}
-
-
- /*
- * VGA text console with hardware cursor
- */
-
-static struct display_switch fbcon_vgafb = {
- fbcon_vga_setup, fbcon_vga_bmove, fbcon_vga_clear, fbcon_vga_putc,
- fbcon_vga_putcs, fbcon_vga_revc, fbcon_vgafb_cursor, NULL, NULL,
- FONTWIDTH(8)
-};
-
-
-#ifdef MODULE
-int init_module(void)
-{
- vgafb_init();
- return 0;
-}
-
-void cleanup_module(void)
-{
- unregister_framebuffer(&fb_info);
-}
-#endif /* MODULE */
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TCL-scripts by Sam Shen, slshen@lbl.gov