vga16fb.c
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上传日期:2013-02-24
资源大小:30529k
文件大小:26k
- /*
- * linux/drivers/video/vga16.c -- VGA 16-color framebuffer driver
- *
- * 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>
- *
- * 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. */
- #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/slab.h>
- #include <linux/delay.h>
- #include <linux/fb.h>
- #include <linux/console.h>
- #include <linux/selection.h>
- #include <linux/ioport.h>
- #include <linux/init.h>
- #include <asm/io.h>
- #include <video/fbcon.h>
- #include <video/fbcon-vga-planes.h>
- #include "vga.h"
- #define dac_reg (0x3c8)
- #define dac_val (0x3c9)
- #define VGA_FB_PHYS 0xA0000
- #define VGA_FB_PHYS_LEN 65536
- /* --------------------------------------------------------------------- */
- /*
- * card parameters
- */
- static struct vga16fb_info {
- struct fb_info fb_info;
- char *video_vbase; /* 0xa0000 map address */
- int isVGA;
-
- /* structure holding original VGA register settings when the
- screen is blanked */
- struct {
- unsigned char SeqCtrlIndex; /* Sequencer Index reg. */
- unsigned char CrtCtrlIndex; /* CRT-Contr. Index reg. */
- unsigned char CrtMiscIO; /* Miscellaneous register */
- unsigned char HorizontalTotal; /* CRT-Controller:00h */
- unsigned char HorizDisplayEnd; /* CRT-Controller:01h */
- unsigned char StartHorizRetrace; /* CRT-Controller:04h */
- unsigned char EndHorizRetrace; /* CRT-Controller:05h */
- unsigned char Overflow; /* CRT-Controller:07h */
- unsigned char StartVertRetrace; /* CRT-Controller:10h */
- unsigned char EndVertRetrace; /* CRT-Controller:11h */
- unsigned char ModeControl; /* CRT-Controller:17h */
- unsigned char ClockingMode; /* Seq-Controller:01h */
- } vga_state;
- int palette_blanked;
- int vesa_blanked;
- } vga16fb;
- struct vga16fb_par {
- u8 crtc[VGA_CRT_C];
- u8 atc[VGA_ATT_C];
- u8 gdc[VGA_GFX_C];
- u8 seq[VGA_SEQ_C];
- u8 misc;
- u8 vss;
- struct fb_var_screeninfo var;
- };
- /* --------------------------------------------------------------------- */
- static struct fb_var_screeninfo vga16fb_defined = {
- 640,480,640,480,/* W,H, W, H (virtual) load xres,xres_virtual*/
- 0,0, /* virtual -> visible no offset */
- 4, /* depth -> load bits_per_pixel */
- 0, /* greyscale ? */
- {0,0,0}, /* R */
- {0,0,0}, /* G */
- {0,0,0}, /* B */
- {0,0,0}, /* transparency */
- 0, /* standard pixel format */
- FB_ACTIVATE_NOW,
- -1,-1,
- 0,
- 39721, 48, 16, 39, 8,
- 96, 2, 0, /* No sync info */
- FB_VMODE_NONINTERLACED,
- {0,0,0,0,0,0}
- };
- static struct display disp;
- static struct { u_short blue, green, red, pad; } palette[256];
- static int currcon = 0;
- /* --------------------------------------------------------------------- */
- static void vga16fb_pan_var(struct fb_info *info, struct fb_var_screeninfo *var)
- {
- u32 pos = (var->xres_virtual * var->yoffset + var->xoffset) >> 3;
- outb(VGA_CRTC_START_HI, VGA_CRT_IC);
- outb(pos >> 8, VGA_CRT_DC);
- outb(VGA_CRTC_START_LO, VGA_CRT_IC);
- outb(pos & 0xFF, VGA_CRT_DC);
- #if 0
- /* if someone supports xoffset in bit resolution */
- inb(VGA_IS1_RC); /* reset flip-flop */
- outb(VGA_ATC_PEL, VGA_ATT_IW);
- outb(xoffset & 7, VGA_ATT_IW);
- inb(VGA_IS1_RC);
- outb(0x20, VGA_ATT_IW);
- #endif
- }
- static int vga16fb_update_var(int con, struct fb_info *info)
- {
- vga16fb_pan_var(info, &fb_display[con].var);
- return 0;
- }
- static int vga16fb_get_fix(struct fb_fix_screeninfo *fix, int con,
- struct fb_info *info)
- {
- struct display *p;
- if (con < 0)
- p = &disp;
- else
- p = fb_display + con;
- memset(fix, 0, sizeof(struct fb_fix_screeninfo));
- strcpy(fix->id,"VGA16 VGA");
- fix->smem_start = VGA_FB_PHYS;
- fix->smem_len = VGA_FB_PHYS_LEN;
- fix->type = FB_TYPE_VGA_PLANES;
- fix->visual = FB_VISUAL_PSEUDOCOLOR;
- fix->xpanstep = 8;
- fix->ypanstep = 1;
- fix->ywrapstep = 0;
- fix->line_length = p->var.xres_virtual / 8;
- return 0;
- }
- static int vga16fb_get_var(struct fb_var_screeninfo *var, int con,
- struct fb_info *info)
- {
- if(con==-1)
- memcpy(var, &vga16fb_defined, sizeof(struct fb_var_screeninfo));
- else
- *var=fb_display[con].var;
- return 0;
- }
- static void vga16fb_set_disp(int con, struct vga16fb_info *info)
- {
- struct fb_fix_screeninfo fix;
- struct display *display;
- if (con < 0)
- display = &disp;
- else
- display = fb_display + con;
-
- vga16fb_get_fix(&fix, con, &info->fb_info);
- display->screen_base = info->video_vbase;
- display->visual = fix.visual;
- display->type = fix.type;
- display->type_aux = fix.type_aux;
- display->ypanstep = fix.ypanstep;
- display->ywrapstep = fix.ywrapstep;
- display->line_length = fix.line_length;
- display->next_line = fix.line_length;
- display->can_soft_blank = 1;
- display->inverse = 0;
- if (info->isVGA)
- display->dispsw = &fbcon_vga_planes;
- else
- display->dispsw = &fbcon_ega_planes;
- display->scrollmode = SCROLL_YREDRAW;
- }
- static void vga16fb_encode_var(struct fb_var_screeninfo *var,
- const struct vga16fb_par *par,
- const struct vga16fb_info *info)
- {
- *var = par->var;
- }
- static void vga16fb_clock_chip(struct vga16fb_par *par,
- unsigned int pixclock,
- const struct vga16fb_info *info)
- {
- static struct {
- u32 pixclock;
- u8 misc;
- u8 seq_clock_mode;
- } *ptr, *best, vgaclocks[] = {
- { 79442 /* 12.587 */, 0x00, 0x08},
- { 70616 /* 14.161 */, 0x04, 0x08},
- { 39721 /* 25.175 */, 0x00, 0x00},
- { 35308 /* 28.322 */, 0x04, 0x00},
- { 0 /* bad */, 0x00, 0x00}};
- int err;
- best = vgaclocks;
- err = pixclock - best->pixclock;
- if (err < 0) err = -err;
- for (ptr = vgaclocks + 1; ptr->pixclock; ptr++) {
- int tmp;
- tmp = pixclock - ptr->pixclock;
- if (tmp < 0) tmp = -tmp;
- if (tmp < err) {
- err = tmp;
- best = ptr;
- }
- }
- par->misc |= best->misc;
- par->seq[VGA_SEQ_CLOCK_MODE] |= best->seq_clock_mode;
- par->var.pixclock = best->pixclock;
- }
-
- #define FAIL(X) return -EINVAL
- static int vga16fb_decode_var(const struct fb_var_screeninfo *var,
- struct vga16fb_par *par,
- const struct vga16fb_info *info)
- {
- u32 xres, right, hslen, left, xtotal;
- u32 yres, lower, vslen, upper, ytotal;
- u32 vxres, xoffset, vyres, yoffset;
- u32 pos;
- u8 r7, rMode;
- int i;
- if (var->bits_per_pixel != 4)
- return -EINVAL;
- xres = (var->xres + 7) & ~7;
- vxres = (var->xres_virtual + 0xF) & ~0xF;
- xoffset = (var->xoffset + 7) & ~7;
- left = (var->left_margin + 7) & ~7;
- right = (var->right_margin + 7) & ~7;
- hslen = (var->hsync_len + 7) & ~7;
- if (vxres < xres)
- vxres = xres;
- if (xres + xoffset > vxres)
- xoffset = vxres - xres;
- par->var.xres = xres;
- par->var.right_margin = right;
- par->var.hsync_len = hslen;
- par->var.left_margin = left;
- par->var.xres_virtual = vxres;
- par->var.xoffset = xoffset;
- xres >>= 3;
- right >>= 3;
- hslen >>= 3;
- left >>= 3;
- vxres >>= 3;
- xtotal = xres + right + hslen + left;
- if (xtotal >= 256)
- FAIL("xtotal too big");
- if (hslen > 32)
- FAIL("hslen too big");
- if (right + hslen + left > 64)
- FAIL("hblank too big");
- par->crtc[VGA_CRTC_H_TOTAL] = xtotal - 5;
- par->crtc[VGA_CRTC_H_BLANK_START] = xres - 1;
- par->crtc[VGA_CRTC_H_DISP] = xres - 1;
- pos = xres + right;
- par->crtc[VGA_CRTC_H_SYNC_START] = pos;
- pos += hslen;
- par->crtc[VGA_CRTC_H_SYNC_END] = pos & 0x1F;
- pos += left - 2; /* blank_end + 2 <= total + 5 */
- par->crtc[VGA_CRTC_H_BLANK_END] = (pos & 0x1F) | 0x80;
- if (pos & 0x20)
- par->crtc[VGA_CRTC_H_SYNC_END] |= 0x80;
- yres = var->yres;
- lower = var->lower_margin;
- vslen = var->vsync_len;
- upper = var->upper_margin;
- vyres = var->yres_virtual;
- yoffset = var->yoffset;
- if (yres > vyres)
- vyres = yres;
- if (vxres * vyres > 65536) {
- vyres = 65536 / vxres;
- if (vyres < yres)
- return -ENOMEM;
- }
- if (yoffset + yres > vyres)
- yoffset = vyres - yres;
- par->var.yres = yres;
- par->var.lower_margin = lower;
- par->var.vsync_len = vslen;
- par->var.upper_margin = upper;
- par->var.yres_virtual = vyres;
- par->var.yoffset = yoffset;
- if (var->vmode & FB_VMODE_DOUBLE) {
- yres <<= 1;
- lower <<= 1;
- vslen <<= 1;
- upper <<= 1;
- }
- ytotal = yres + lower + vslen + upper;
- if (ytotal > 1024) {
- ytotal >>= 1;
- yres >>= 1;
- lower >>= 1;
- vslen >>= 1;
- upper >>= 1;
- rMode = 0x04;
- } else
- rMode = 0x00;
- if (ytotal > 1024)
- FAIL("ytotal too big");
- if (vslen > 16)
- FAIL("vslen too big");
- par->crtc[VGA_CRTC_V_TOTAL] = ytotal - 2;
- r7 = 0x10; /* disable linecompare */
- if (ytotal & 0x100) r7 |= 0x01;
- if (ytotal & 0x200) r7 |= 0x20;
- par->crtc[VGA_CRTC_PRESET_ROW] = 0;
- par->crtc[VGA_CRTC_MAX_SCAN] = 0x40; /* 1 scanline, no linecmp */
- par->var.vmode = var->vmode;
- if (var->vmode & FB_VMODE_DOUBLE)
- par->crtc[VGA_CRTC_MAX_SCAN] |= 0x80;
- par->crtc[VGA_CRTC_CURSOR_START] = 0x20;
- par->crtc[VGA_CRTC_CURSOR_END] = 0x00;
- pos = yoffset * vxres + (xoffset >> 3);
- par->crtc[VGA_CRTC_START_HI] = pos >> 8;
- par->crtc[VGA_CRTC_START_LO] = pos & 0xFF;
- par->crtc[VGA_CRTC_CURSOR_HI] = 0x00;
- par->crtc[VGA_CRTC_CURSOR_LO] = 0x00;
- pos = yres - 1;
- par->crtc[VGA_CRTC_V_DISP_END] = pos & 0xFF;
- par->crtc[VGA_CRTC_V_BLANK_START] = pos & 0xFF;
- if (pos & 0x100)
- r7 |= 0x0A; /* 0x02 -> DISP_END, 0x08 -> BLANK_START */
- if (pos & 0x200) {
- r7 |= 0x40; /* 0x40 -> DISP_END */
- par->crtc[VGA_CRTC_MAX_SCAN] |= 0x20; /* BLANK_START */
- }
- pos += lower;
- par->crtc[VGA_CRTC_V_SYNC_START] = pos & 0xFF;
- if (pos & 0x100)
- r7 |= 0x04;
- if (pos & 0x200)
- r7 |= 0x80;
- pos += vslen;
- par->crtc[VGA_CRTC_V_SYNC_END] = (pos & 0x0F) & ~0x10; /* disabled IRQ */
- pos += upper - 1; /* blank_end + 1 <= ytotal + 2 */
- par->crtc[VGA_CRTC_V_BLANK_END] = pos & 0xFF; /* 0x7F for original VGA,
- but some SVGA chips requires all 8 bits to set */
- if (vxres >= 512)
- FAIL("vxres too long");
- par->crtc[VGA_CRTC_OFFSET] = vxres >> 1;
- par->crtc[VGA_CRTC_UNDERLINE] = 0x1F;
- par->crtc[VGA_CRTC_MODE] = rMode | 0xE3;
- par->crtc[VGA_CRTC_LINE_COMPARE] = 0xFF;
- par->crtc[VGA_CRTC_OVERFLOW] = r7;
- par->vss = 0x00; /* 3DA */
- for (i = 0x00; i < 0x10; i++)
- par->atc[i] = i;
- par->atc[VGA_ATC_MODE] = 0x81;
- par->atc[VGA_ATC_OVERSCAN] = 0x00; /* 0 for EGA, 0xFF for VGA */
- par->atc[VGA_ATC_PLANE_ENABLE] = 0x0F;
- par->atc[VGA_ATC_PEL] = xoffset & 7;
- par->atc[VGA_ATC_COLOR_PAGE] = 0x00;
-
- par->misc = 0xC3; /* enable CPU, ports 0x3Dx, positive sync */
- par->var.sync = var->sync;
- if (var->sync & FB_SYNC_HOR_HIGH_ACT)
- par->misc &= ~0x40;
- if (var->sync & FB_SYNC_VERT_HIGH_ACT)
- par->misc &= ~0x80;
-
- par->seq[VGA_SEQ_CLOCK_MODE] = 0x01;
- par->seq[VGA_SEQ_PLANE_WRITE] = 0x0F;
- par->seq[VGA_SEQ_CHARACTER_MAP] = 0x00;
- par->seq[VGA_SEQ_MEMORY_MODE] = 0x06;
-
- par->gdc[VGA_GFX_SR_VALUE] = 0x00;
- par->gdc[VGA_GFX_SR_ENABLE] = 0x0F;
- par->gdc[VGA_GFX_COMPARE_VALUE] = 0x00;
- par->gdc[VGA_GFX_DATA_ROTATE] = 0x20;
- par->gdc[VGA_GFX_PLANE_READ] = 0;
- par->gdc[VGA_GFX_MODE] = 0x00;
- par->gdc[VGA_GFX_MISC] = 0x05;
- par->gdc[VGA_GFX_COMPARE_MASK] = 0x0F;
- par->gdc[VGA_GFX_BIT_MASK] = 0xFF;
- vga16fb_clock_chip(par, var->pixclock, info);
- par->var.bits_per_pixel = 4;
- par->var.grayscale = var->grayscale;
- par->var.red.offset = par->var.green.offset = par->var.blue.offset =
- par->var.transp.offset = 0;
- par->var.red.length = par->var.green.length = par->var.blue.length =
- (info->isVGA) ? 6 : 2;
- par->var.transp.length = 0;
- par->var.nonstd = 0;
- par->var.activate = FB_ACTIVATE_NOW;
- par->var.height = -1;
- par->var.width = -1;
- par->var.accel_flags = 0;
-
- return 0;
- }
- #undef FAIL
- static int vga16fb_set_par(const struct vga16fb_par *par,
- struct vga16fb_info *info)
- {
- int i;
- outb(inb(VGA_MIS_R) | 0x01, VGA_MIS_W);
- /* Enable graphics register modification */
- if (!info->isVGA) {
- outb(0x00, EGA_GFX_E0);
- outb(0x01, EGA_GFX_E1);
- }
-
- /* update misc output register */
- outb(par->misc, VGA_MIS_W);
-
- /* synchronous reset on */
- outb(0x00, VGA_SEQ_I);
- outb(0x01, VGA_SEQ_D);
-
- /* write sequencer registers */
- outb(1, VGA_SEQ_I);
- outb(par->seq[1] | 0x20, VGA_SEQ_D);
- for (i = 2; i < VGA_SEQ_C; i++) {
- outb(i, VGA_SEQ_I);
- outb(par->seq[i], VGA_SEQ_D);
- }
-
- /* synchronous reset off */
- outb(0x00, VGA_SEQ_I);
- outb(0x03, VGA_SEQ_D);
-
- /* deprotect CRT registers 0-7 */
- outb(0x11, VGA_CRT_IC);
- outb(par->crtc[0x11], VGA_CRT_DC);
- /* write CRT registers */
- for (i = 0; i < VGA_CRT_C; i++) {
- outb(i, VGA_CRT_IC);
- outb(par->crtc[i], VGA_CRT_DC);
- }
-
- /* write graphics controller registers */
- for (i = 0; i < VGA_GFX_C; i++) {
- outb(i, VGA_GFX_I);
- outb(par->gdc[i], VGA_GFX_D);
- }
-
- /* write attribute controller registers */
- for (i = 0; i < VGA_ATT_C; i++) {
- inb_p(VGA_IS1_RC); /* reset flip-flop */
- outb_p(i, VGA_ATT_IW);
- outb_p(par->atc[i], VGA_ATT_IW);
- }
- /* Wait for screen to stabilize. */
- mdelay(50);
- outb(0x01, VGA_SEQ_I);
- outb(par->seq[1], VGA_SEQ_D);
- inb(VGA_IS1_RC);
- outb(0x20, VGA_ATT_IW);
-
- return 0;
- }
- static int vga16fb_set_var(struct fb_var_screeninfo *var, int con,
- struct fb_info *fb)
- {
- struct vga16fb_info *info = (struct vga16fb_info*)fb;
- struct vga16fb_par par;
- struct display *display;
- int err;
- if (con < 0)
- display = fb->disp;
- else
- display = fb_display + con;
- if ((err = vga16fb_decode_var(var, &par, info)) != 0)
- return err;
- vga16fb_encode_var(var, &par, info);
-
- if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_TEST)
- return 0;
- if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
- u32 oldxres, oldyres, oldvxres, oldvyres, oldbpp;
- oldxres = display->var.xres;
- oldyres = display->var.yres;
- oldvxres = display->var.xres_virtual;
- oldvyres = display->var.yres_virtual;
- oldbpp = display->var.bits_per_pixel;
- display->var = *var;
- if (oldxres != var->xres || oldyres != var->yres ||
- oldvxres != var->xres_virtual || oldvyres != var->yres_virtual ||
- oldbpp != var->bits_per_pixel) {
- vga16fb_set_disp(con, info);
- if (info->fb_info.changevar)
- info->fb_info.changevar(con);
- }
- if (con == currcon)
- vga16fb_set_par(&par, info);
- }
- return 0;
- }
- static void ega16_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
- {
- static unsigned char map[] = { 000, 001, 010, 011 };
- int val;
-
- val = map[red>>14] | ((map[green>>14]) << 1) | ((map[blue>>14]) << 2);
- inb_p(0x3DA); /* ! 0x3BA */
- outb_p(regno, 0x3C0);
- outb_p(val, 0x3C0);
- inb_p(0x3DA); /* some clones need it */
- outb_p(0x20, 0x3C0); /* unblank screen */
- }
- static int vga16_getcolreg(unsigned regno, unsigned *red, unsigned *green,
- unsigned *blue, unsigned *transp,
- struct fb_info *fb_info)
- {
- /*
- * Read a single color register and split it into colors/transparent.
- * Return != 0 for invalid regno.
- */
- if (regno >= 16)
- return 1;
- *red = palette[regno].red;
- *green = palette[regno].green;
- *blue = palette[regno].blue;
- *transp = 0;
- return 0;
- }
- static void vga16_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
- {
- outb(regno, dac_reg);
- outb(red >> 10, dac_val);
- outb(green >> 10, dac_val);
- outb(blue >> 10, dac_val);
- }
- static int vga16_setcolreg(unsigned regno, unsigned red, unsigned green,
- unsigned blue, unsigned transp,
- struct fb_info *fb_info)
- {
- int gray;
- /*
- * 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.
- */
-
- if (regno >= 16)
- return 1;
- palette[regno].red = red;
- palette[regno].green = green;
- palette[regno].blue = blue;
-
- if (currcon < 0)
- gray = disp.var.grayscale;
- else
- gray = fb_display[currcon].var.grayscale;
- if (gray) {
- /* gray = 0.30*R + 0.59*G + 0.11*B */
- red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
- }
- if (((struct vga16fb_info *) fb_info)->isVGA)
- vga16_setpalette(regno,red,green,blue);
- else
- ega16_setpalette(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, 1, vga16_setcolreg, info);
- else
- fb_set_cmap(fb_default_cmap(16), 1, vga16_setcolreg,
- info);
- }
- static int vga16fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
- struct fb_info *info)
- {
- if (con == currcon) /* current console? */
- return fb_get_cmap(cmap, kspc, vga16_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(16),
- cmap, kspc ? 0 : 2);
- return 0;
- }
- static int vga16fb_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? */
- err = fb_alloc_cmap(&fb_display[con].cmap,16,0);
- if (err)
- return err;
- }
- if (con == currcon) /* current console? */
- return fb_set_cmap(cmap, kspc, vga16_setcolreg, info);
- else
- fb_copy_cmap(cmap, &fb_display[con].cmap, kspc ? 0 : 1);
- return 0;
- }
- static int vga16fb_pan_display(struct fb_var_screeninfo *var, int con,
- struct fb_info *info)
- {
- if (var->xoffset + fb_display[con].var.xres > fb_display[con].var.xres_virtual ||
- var->yoffset + fb_display[con].var.yres > fb_display[con].var.yres_virtual)
- return -EINVAL;
- if (con == currcon)
- vga16fb_pan_var(info, var);
- fb_display[con].var.xoffset = var->xoffset;
- fb_display[con].var.yoffset = var->yoffset;
- fb_display[con].var.vmode &= ~FB_VMODE_YWRAP;
- return 0;
- }
- static struct fb_ops vga16fb_ops = {
- owner: THIS_MODULE,
- fb_get_fix: vga16fb_get_fix,
- fb_get_var: vga16fb_get_var,
- fb_set_var: vga16fb_set_var,
- fb_get_cmap: vga16fb_get_cmap,
- fb_set_cmap: vga16fb_set_cmap,
- fb_pan_display: vga16fb_pan_display,
- };
- int vga16fb_setup(char *options)
- {
- char *this_opt;
-
- vga16fb.fb_info.fontname[0] = ' ';
-
- if (!options || !*options)
- return 0;
-
- while ((this_opt = strsep(&options, ",")) != NULL) {
- if (!*this_opt) continue;
-
- if (!strncmp(this_opt, "font:", 5))
- strcpy(vga16fb.fb_info.fontname, this_opt+5);
- }
- return 0;
- }
- static int vga16fb_switch(int con, struct fb_info *fb)
- {
- struct vga16fb_par par;
- struct vga16fb_info *info = (struct vga16fb_info*)fb;
- /* Do we have to save the colormap? */
- if (fb_display[currcon].cmap.len)
- fb_get_cmap(&fb_display[currcon].cmap, 1, vga16_getcolreg,
- fb);
-
- currcon = con;
- vga16fb_decode_var(&fb_display[con].var, &par, info);
- vga16fb_set_par(&par, info);
- vga16fb_set_disp(con, info);
- /* Install new colormap */
- do_install_cmap(con, fb);
- /* vga16fb_update_var(con, fb); */
- return 1;
- }
- /* The following VESA blanking code is taken from vgacon.c. The VGA
- blanking code was originally by Huang shi chao, and modified by
- Christoph Rimek (chrimek@toppoint.de) and todd j. derr
- (tjd@barefoot.org) for Linux. */
- #define attrib_port 0x3c0
- #define seq_port_reg 0x3c4
- #define seq_port_val 0x3c5
- #define gr_port_reg 0x3ce
- #define gr_port_val 0x3cf
- #define video_misc_rd 0x3cc
- #define video_misc_wr 0x3c2
- #define vga_video_port_reg 0x3d4
- #define vga_video_port_val 0x3d5
- static void vga_vesa_blank(struct vga16fb_info *info, int mode)
- {
- unsigned char SeqCtrlIndex;
- unsigned char CrtCtrlIndex;
-
- cli();
- SeqCtrlIndex = inb_p(seq_port_reg);
- CrtCtrlIndex = inb_p(vga_video_port_reg);
- /* save original values of VGA controller registers */
- if(!info->vesa_blanked) {
- info->vga_state.CrtMiscIO = inb_p(video_misc_rd);
- sti();
- outb_p(0x00,vga_video_port_reg); /* HorizontalTotal */
- info->vga_state.HorizontalTotal = inb_p(vga_video_port_val);
- outb_p(0x01,vga_video_port_reg); /* HorizDisplayEnd */
- info->vga_state.HorizDisplayEnd = inb_p(vga_video_port_val);
- outb_p(0x04,vga_video_port_reg); /* StartHorizRetrace */
- info->vga_state.StartHorizRetrace = inb_p(vga_video_port_val);
- outb_p(0x05,vga_video_port_reg); /* EndHorizRetrace */
- info->vga_state.EndHorizRetrace = inb_p(vga_video_port_val);
- outb_p(0x07,vga_video_port_reg); /* Overflow */
- info->vga_state.Overflow = inb_p(vga_video_port_val);
- outb_p(0x10,vga_video_port_reg); /* StartVertRetrace */
- info->vga_state.StartVertRetrace = inb_p(vga_video_port_val);
- outb_p(0x11,vga_video_port_reg); /* EndVertRetrace */
- info->vga_state.EndVertRetrace = inb_p(vga_video_port_val);
- outb_p(0x17,vga_video_port_reg); /* ModeControl */
- info->vga_state.ModeControl = inb_p(vga_video_port_val);
- outb_p(0x01,seq_port_reg); /* ClockingMode */
- info->vga_state.ClockingMode = inb_p(seq_port_val);
- }
- /* assure that video is enabled */
- /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */
- cli();
- outb_p(0x01,seq_port_reg);
- outb_p(info->vga_state.ClockingMode | 0x20,seq_port_val);
- /* test for vertical retrace in process.... */
- if ((info->vga_state.CrtMiscIO & 0x80) == 0x80)
- outb_p(info->vga_state.CrtMiscIO & 0xef,video_misc_wr);
- /*
- * Set <End of vertical retrace> to minimum (0) and
- * <Start of vertical Retrace> to maximum (incl. overflow)
- * Result: turn off vertical sync (VSync) pulse.
- */
- if (mode & VESA_VSYNC_SUSPEND) {
- outb_p(0x10,vga_video_port_reg); /* StartVertRetrace */
- outb_p(0xff,vga_video_port_val); /* maximum value */
- outb_p(0x11,vga_video_port_reg); /* EndVertRetrace */
- outb_p(0x40,vga_video_port_val); /* minimum (bits 0..3) */
- outb_p(0x07,vga_video_port_reg); /* Overflow */
- outb_p(info->vga_state.Overflow | 0x84,vga_video_port_val); /* bits 9,10 of vert. retrace */
- }
- if (mode & VESA_HSYNC_SUSPEND) {
- /*
- * Set <End of horizontal retrace> to minimum (0) and
- * <Start of horizontal Retrace> to maximum
- * Result: turn off horizontal sync (HSync) pulse.
- */
- outb_p(0x04,vga_video_port_reg); /* StartHorizRetrace */
- outb_p(0xff,vga_video_port_val); /* maximum */
- outb_p(0x05,vga_video_port_reg); /* EndHorizRetrace */
- outb_p(0x00,vga_video_port_val); /* minimum (0) */
- }
- /* restore both index registers */
- outb_p(SeqCtrlIndex,seq_port_reg);
- outb_p(CrtCtrlIndex,vga_video_port_reg);
- sti();
- }
- static void vga_vesa_unblank(struct vga16fb_info *info)
- {
- unsigned char SeqCtrlIndex;
- unsigned char CrtCtrlIndex;
-
- cli();
- SeqCtrlIndex = inb_p(seq_port_reg);
- CrtCtrlIndex = inb_p(vga_video_port_reg);
- /* restore original values of VGA controller registers */
- outb_p(info->vga_state.CrtMiscIO,video_misc_wr);
- outb_p(0x00,vga_video_port_reg); /* HorizontalTotal */
- outb_p(info->vga_state.HorizontalTotal,vga_video_port_val);
- outb_p(0x01,vga_video_port_reg); /* HorizDisplayEnd */
- outb_p(info->vga_state.HorizDisplayEnd,vga_video_port_val);
- outb_p(0x04,vga_video_port_reg); /* StartHorizRetrace */
- outb_p(info->vga_state.StartHorizRetrace,vga_video_port_val);
- outb_p(0x05,vga_video_port_reg); /* EndHorizRetrace */
- outb_p(info->vga_state.EndHorizRetrace,vga_video_port_val);
- outb_p(0x07,vga_video_port_reg); /* Overflow */
- outb_p(info->vga_state.Overflow,vga_video_port_val);
- outb_p(0x10,vga_video_port_reg); /* StartVertRetrace */
- outb_p(info->vga_state.StartVertRetrace,vga_video_port_val);
- outb_p(0x11,vga_video_port_reg); /* EndVertRetrace */
- outb_p(info->vga_state.EndVertRetrace,vga_video_port_val);
- outb_p(0x17,vga_video_port_reg); /* ModeControl */
- outb_p(info->vga_state.ModeControl,vga_video_port_val);
- outb_p(0x01,seq_port_reg); /* ClockingMode */
- outb_p(info->vga_state.ClockingMode,seq_port_val);
- /* restore index/control registers */
- outb_p(SeqCtrlIndex,seq_port_reg);
- outb_p(CrtCtrlIndex,vga_video_port_reg);
- sti();
- }
- static void vga_pal_blank(void)
- {
- int i;
- for (i=0; i<16; i++) {
- outb_p (i, dac_reg) ;
- outb_p (0, dac_val) ;
- outb_p (0, dac_val) ;
- outb_p (0, dac_val) ;
- }
- }
- /* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
- static void vga16fb_blank(int blank, struct fb_info *fb_info)
- {
- struct vga16fb_info *info = (struct vga16fb_info*)fb_info;
- switch (blank) {
- case 0: /* Unblank */
- if (info->vesa_blanked) {
- vga_vesa_unblank(info);
- info->vesa_blanked = 0;
- }
- if (info->palette_blanked) {
- do_install_cmap(currcon, fb_info);
- info->palette_blanked = 0;
- }
- break;
- case 1: /* blank */
- vga_pal_blank();
- info->palette_blanked = 1;
- break;
- default: /* VESA blanking */
- vga_vesa_blank(info, blank-1);
- info->vesa_blanked = 1;
- break;
- }
- }
- int __init vga16fb_init(void)
- {
- int i,j;
- printk(KERN_DEBUG "vga16fb: initializingn");
- /* XXX share VGA_FB_PHYS region with vgacon */
- vga16fb.video_vbase = ioremap(VGA_FB_PHYS, VGA_FB_PHYS_LEN);
- if (!vga16fb.video_vbase) {
- printk(KERN_ERR "vga16fb: unable to map devicen");
- return -ENOMEM;
- }
- printk(KERN_INFO "vga16fb: mapped to 0x%pn", vga16fb.video_vbase);
- vga16fb.isVGA = ORIG_VIDEO_ISVGA;
- vga16fb.palette_blanked = 0;
- vga16fb.vesa_blanked = 0;
- i = vga16fb.isVGA? 6 : 2;
-
- vga16fb_defined.red.length = i;
- vga16fb_defined.green.length = i;
- vga16fb_defined.blue.length = i;
- for(i = 0; i < 16; i++) {
- j = color_table[i];
- palette[i].red = default_red[j];
- palette[i].green = default_grn[j];
- palette[i].blue = default_blu[j];
- }
- /* XXX share VGA I/O region with vgacon and others */
- disp.var = vga16fb_defined;
- /* name should not depend on EGA/VGA */
- strcpy(vga16fb.fb_info.modename, "VGA16 VGA");
- vga16fb.fb_info.changevar = NULL;
- vga16fb.fb_info.node = -1;
- vga16fb.fb_info.fbops = &vga16fb_ops;
- vga16fb.fb_info.disp=&disp;
- vga16fb.fb_info.switch_con=&vga16fb_switch;
- vga16fb.fb_info.updatevar=&vga16fb_update_var;
- vga16fb.fb_info.blank=&vga16fb_blank;
- vga16fb.fb_info.flags=FBINFO_FLAG_DEFAULT;
- vga16fb_set_disp(-1, &vga16fb);
- if (register_framebuffer(&vga16fb.fb_info)<0) {
- iounmap(vga16fb.video_vbase);
- return -EINVAL;
- }
- printk(KERN_INFO "fb%d: %s frame buffer devicen",
- GET_FB_IDX(vga16fb.fb_info.node), vga16fb.fb_info.modename);
- return 0;
- }
- static void __exit vga16fb_exit(void)
- {
- unregister_framebuffer(&vga16fb.fb_info);
- iounmap(vga16fb.video_vbase);
- /* XXX unshare VGA regions */
- }
- #ifdef MODULE
- MODULE_LICENSE("GPL");
- module_init(vga16fb_init);
- #endif
- module_exit(vga16fb_exit);
- /*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-basic-offset: 8
- * End:
- */