/* * 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/delay.h> #include <linux/fb.h> #include <linux/ioport.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/screen_info.h> #include <asm/io.h> #include <video/vga.h> #define VGA_FB_PHYS 0xA0000 #define VGA_FB_PHYS_LEN 65536 #define MODE_SKIP4 1 #define MODE_8BPP 2 #define MODE_CFB 4 #define MODE_TEXT 8 /* --------------------------------------------------------------------- */ /* * card parameters */ struct vga16fb_par { /* 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; struct vgastate state; unsigned int ref_count; int palette_blanked, vesa_blanked, mode, isVGA; u8 misc, pel_msk, vss, clkdiv; u8 crtc[VGA_CRT_C]; }; /* --------------------------------------------------------------------- */ static struct fb_var_screeninfo vga16fb_defined = { .xres = 640, .yres = 480, .xres_virtual = 640, .yres_virtual = 480, .bits_per_pixel = 4, .activate = FB_ACTIVATE_TEST, .height = -1, .width = -1, .pixclock = 39721, .left_margin = 48, .right_margin = 16, .upper_margin = 33, .lower_margin = 10, .hsync_len = 96, .vsync_len = 2, .vmode = FB_VMODE_NONINTERLACED, }; /* name should not depend on EGA/VGA */ static const struct fb_fix_screeninfo vga16fb_fix = { .id = "VGA16 VGA", .smem_start = VGA_FB_PHYS, .smem_len = VGA_FB_PHYS_LEN, .type = FB_TYPE_VGA_PLANES, .type_aux = FB_AUX_VGA_PLANES_VGA4, .visual = FB_VISUAL_PSEUDOCOLOR, .xpanstep = 8, .ypanstep = 1, .line_length = 640 / 8, .accel = FB_ACCEL_NONE }; /* The VGA's weird architecture often requires that we read a byte and write a byte to the same location. It doesn't matter *what* byte we write, however. This is because all the action goes on behind the scenes in the VGA's 32-bit latch register, and reading and writing video memory just invokes latch behavior. To avoid race conditions (is this necessary?), reading and writing the memory byte should be done with a single instruction. One suitable instruction is the x86 bitwise OR. The following read-modify-write routine should optimize to one such bitwise OR. */ static inline void rmw(volatile char __iomem *p) { readb(p); writeb(1, p); } /* Set the Graphics Mode Register, and return its previous value. Bits 0-1 are write mode, bit 3 is read mode. */ static inline int setmode(int mode) { int oldmode; oldmode = vga_io_rgfx(VGA_GFX_MODE); vga_io_w(VGA_GFX_D, mode); return oldmode; } /* Select the Bit Mask Register and return its value. */ static inline int selectmask(void) { return vga_io_rgfx(VGA_GFX_BIT_MASK); } /* Set the value of the Bit Mask Register. It must already have been selected with selectmask(). */ static inline void setmask(int mask) { vga_io_w(VGA_GFX_D, mask); } /* Set the Data Rotate Register and return its old value. Bits 0-2 are rotate count, bits 3-4 are logical operation (0=NOP, 1=AND, 2=OR, 3=XOR). */ static inline int setop(int op) { int oldop; oldop = vga_io_rgfx(VGA_GFX_DATA_ROTATE); vga_io_w(VGA_GFX_D, op); return oldop; } /* Set the Enable Set/Reset Register and return its old value. The code here always uses value 0xf for this register. */ static inline int setsr(int sr) { int oldsr; oldsr = vga_io_rgfx(VGA_GFX_SR_ENABLE); vga_io_w(VGA_GFX_D, sr); return oldsr; } /* Set the Set/Reset Register and return its old value. */ static inline int setcolor(int color) { int oldcolor; oldcolor = vga_io_rgfx(VGA_GFX_SR_VALUE); vga_io_w(VGA_GFX_D, color); return oldcolor; } /* Return the value in the Graphics Address Register. */ static inline int getindex(void) { return vga_io_r(VGA_GFX_I); } /* Set the value in the Graphics Address Register. */ static inline void setindex(int index) { vga_io_w(VGA_GFX_I, index); } static void vga16fb_pan_var(struct fb_info *info, struct fb_var_screeninfo *var) { struct vga16fb_par *par = info->par; u32 xoffset, pos; xoffset = var->xoffset; if (info->var.bits_per_pixel == 8) { pos = (info->var.xres_virtual * var->yoffset + xoffset) >> 2; } else if (par->mode & MODE_TEXT) { int fh = 16; // FIXME !!! font height. Fugde for now. pos = (info->var.xres_virtual * (var->yoffset / fh) + xoffset) >> 3; } else { if (info->var.nonstd) xoffset--; pos = (info->var.xres_virtual * var->yoffset + xoffset) >> 3; } vga_io_wcrt(VGA_CRTC_START_HI, pos >> 8); vga_io_wcrt(VGA_CRTC_START_LO, pos & 0xFF); /* if we support CFB4, then we must! support xoffset with pixel * granularity if someone supports xoffset in bit resolution */ vga_io_r(VGA_IS1_RC); /* reset flip-flop */ vga_io_w(VGA_ATT_IW, VGA_ATC_PEL); if (info->var.bits_per_pixel == 8) vga_io_w(VGA_ATT_IW, (xoffset & 3) << 1); else vga_io_w(VGA_ATT_IW, xoffset & 7); vga_io_r(VGA_IS1_RC); vga_io_w(VGA_ATT_IW, 0x20); } static void vga16fb_update_fix(struct fb_info *info) { if (info->var.bits_per_pixel == 4) { if (info->var.nonstd) { info->fix.type = FB_TYPE_PACKED_PIXELS; info->fix.line_length = info->var.xres_virtual / 2; } else { info->fix.type = FB_TYPE_VGA_PLANES; info->fix.type_aux = FB_AUX_VGA_PLANES_VGA4; info->fix.line_length = info->var.xres_virtual / 8; } } else if (info->var.bits_per_pixel == 0) { info->fix.type = FB_TYPE_TEXT; info->fix.type_aux = FB_AUX_TEXT_CGA; info->fix.line_length = info->var.xres_virtual / 4; } else { /* 8bpp */ if (info->var.nonstd) { info->fix.type = FB_TYPE_VGA_PLANES; info->fix.type_aux = FB_AUX_VGA_PLANES_CFB8; info->fix.line_length = info->var.xres_virtual / 4; } else { info->fix.type = FB_TYPE_PACKED_PIXELS; info->fix.line_length = info->var.xres_virtual; } } } static void vga16fb_clock_chip(struct vga16fb_par *par, unsigned int pixclock, const struct fb_info *info, int mul, int div) { static const 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; pixclock = (pixclock * mul) / div; 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->clkdiv = best->seq_clock_mode; pixclock = (best->pixclock * div) / mul; } #define FAIL(X) return -EINVAL static int vga16fb_open(struct fb_info *info, int user) { struct vga16fb_par *par = info->par; if (!par->ref_count) { memset(&par->state, 0, sizeof(struct vgastate)); par->state.flags = VGA_SAVE_FONTS | VGA_SAVE_MODE | VGA_SAVE_CMAP; save_vga(&par->state); } par->ref_count++; return 0; } static int vga16fb_release(struct fb_info *info, int user) { struct vga16fb_par *par = info->par; if (!par->ref_count) return -EINVAL; if (par->ref_count == 1) restore_vga(&par->state); par->ref_count--; return 0; } static int vga16fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { struct vga16fb_par *par = info->par; u32 xres, right, hslen, left, xtotal; u32 yres, lower, vslen, upper, ytotal; u32 vxres, xoffset, vyres, yoffset; u32 pos; u8 r7, rMode; int shift; int mode; u32 maxmem; par->pel_msk = 0xFF; if (var->bits_per_pixel == 4) { if (var->nonstd) { if (!par->isVGA) return -EINVAL; shift = 3; mode = MODE_SKIP4 | MODE_CFB; maxmem = 16384; par->pel_msk = 0x0F; } else { shift = 3; mode = 0; maxmem = 65536; } } else if (var->bits_per_pixel == 8) { if (!par->isVGA) return -EINVAL; /* no support on EGA */ shift = 2; if (var->nonstd) { mode = MODE_8BPP | MODE_CFB; maxmem = 65536; } else { mode = MODE_SKIP4 | MODE_8BPP | MODE_CFB; maxmem = 16384; } } else 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; var->xres = xres; var->right_margin = right; var->hsync_len = hslen; var->left_margin = left; var->xres_virtual = vxres; var->xoffset = xoffset; xres >>= shift; right >>= shift; hslen >>= shift; left >>= shift; vxres >>= shift; 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 > maxmem) { vyres = maxmem / vxres; if (vyres < yres) return -ENOMEM; } if (yoffset + yres > vyres) yoffset = vyres - yres; var->yres = yres; var->lower_margin = lower; var->vsync_len = vslen; var->upper_margin = upper; var->yres_virtual = vyres; 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 */ 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; if ((mode & (MODE_CFB | MODE_8BPP)) == MODE_CFB) xoffset--; pos = yoffset * vxres + (xoffset >> shift); 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; if (mode & MODE_SKIP4) par->crtc[VGA_CRTC_UNDERLINE] = 0x5F; /* 256, cfb8 */ else par->crtc[VGA_CRTC_UNDERLINE] = 0x1F; /* 16, vgap */ par->crtc[VGA_CRTC_MODE] = rMode | ((mode & MODE_TEXT) ? 0xA3 : 0xE3); par->crtc[VGA_CRTC_LINE_COMPARE] = 0xFF; par->crtc[VGA_CRTC_OVERFLOW] = r7; par->vss = 0x00; /* 3DA */ par->misc = 0xE3; /* enable CPU, ports 0x3Dx, positive sync */ if (var->sync & FB_SYNC_HOR_HIGH_ACT) par->misc &= ~0x40; if (var->sync & FB_SYNC_VERT_HIGH_ACT) par->misc &= ~0x80; par->mode = mode; if (mode & MODE_8BPP) /* pixel clock == vga clock / 2 */ vga16fb_clock_chip(par, var->pixclock, info, 1, 2); else /* pixel clock == vga clock */ vga16fb_clock_chip(par, var->pixclock, info, 1, 1); var->red.offset = var->green.offset = var->blue.offset = var->transp.offset = 0; var->red.length = var->green.length = var->blue.length = (par->isVGA) ? 6 : 2; var->transp.length = 0; var->activate = FB_ACTIVATE_NOW; var->height = -1; var->width = -1; var->accel_flags = 0; return 0; } #undef FAIL static int vga16fb_set_par(struct fb_info *info) { struct vga16fb_par *par = info->par; u8 gdc[VGA_GFX_C]; u8 seq[VGA_SEQ_C]; u8 atc[VGA_ATT_C]; int fh, i; seq[VGA_SEQ_CLOCK_MODE] = 0x01 | par->clkdiv; if (par->mode & MODE_TEXT) seq[VGA_SEQ_PLANE_WRITE] = 0x03; else seq[VGA_SEQ_PLANE_WRITE] = 0x0F; seq[VGA_SEQ_CHARACTER_MAP] = 0x00; if (par->mode & MODE_TEXT) seq[VGA_SEQ_MEMORY_MODE] = 0x03; else if (par->mode & MODE_SKIP4) seq[VGA_SEQ_MEMORY_MODE] = 0x0E; else seq[VGA_SEQ_MEMORY_MODE] = 0x06; gdc[VGA_GFX_SR_VALUE] = 0x00; gdc[VGA_GFX_SR_ENABLE] = 0x00; gdc[VGA_GFX_COMPARE_VALUE] = 0x00; gdc[VGA_GFX_DATA_ROTATE] = 0x00; gdc[VGA_GFX_PLANE_READ] = 0; if (par->mode & MODE_TEXT) { gdc[VGA_GFX_MODE] = 0x10; gdc[VGA_GFX_MISC] = 0x06; } else { if (par->mode & MODE_CFB) gdc[VGA_GFX_MODE] = 0x40; else gdc[VGA_GFX_MODE] = 0x00; gdc[VGA_GFX_MISC] = 0x05; } gdc[VGA_GFX_COMPARE_MASK] = 0x0F; gdc[VGA_GFX_BIT_MASK] = 0xFF; for (i = 0x00; i < 0x10; i++) atc[i] = i; if (par->mode & MODE_TEXT) atc[VGA_ATC_MODE] = 0x04; else if (par->mode & MODE_8BPP) atc[VGA_ATC_MODE] = 0x41; else atc[VGA_ATC_MODE] = 0x81; atc[VGA_ATC_OVERSCAN] = 0x00; /* 0 for EGA, 0xFF for VGA */ atc[VGA_ATC_PLANE_ENABLE] = 0x0F; if (par->mode & MODE_8BPP) atc[VGA_ATC_PEL] = (info->var.xoffset & 3) << 1; else atc[VGA_ATC_PEL] = info->var.xoffset & 7; atc[VGA_ATC_COLOR_PAGE] = 0x00; if (par->mode & MODE_TEXT) { fh = 16; // FIXME !!! Fudge font height. par->crtc[VGA_CRTC_MAX_SCAN] = (par->crtc[VGA_CRTC_MAX_SCAN] & ~0x1F) | (fh - 1); } vga_io_w(VGA_MIS_W, vga_io_r(VGA_MIS_R) | 0x01); /* Enable graphics register modification */ if (!par->isVGA) { vga_io_w(EGA_GFX_E0, 0x00); vga_io_w(EGA_GFX_E1, 0x01); } /* update misc output register */ vga_io_w(VGA_MIS_W, par->misc); /* synchronous reset on */ vga_io_wseq(0x00, 0x01); if (par->isVGA) vga_io_w(VGA_PEL_MSK, par->pel_msk); /* write sequencer registers */ vga_io_wseq(VGA_SEQ_CLOCK_MODE, seq[VGA_SEQ_CLOCK_MODE] | 0x20); for (i = 2; i < VGA_SEQ_C; i++) { vga_io_wseq(i, seq[i]); } /* synchronous reset off */ vga_io_wseq(0x00, 0x03); /* deprotect CRT registers 0-7 */ vga_io_wcrt(VGA_CRTC_V_SYNC_END, par->crtc[VGA_CRTC_V_SYNC_END]); /* write CRT registers */ for (i = 0; i < VGA_CRTC_REGS; i++) { vga_io_wcrt(i, par->crtc[i]); } /* write graphics controller registers */ for (i = 0; i < VGA_GFX_C; i++) { vga_io_wgfx(i, gdc[i]); } /* write attribute controller registers */ for (i = 0; i < VGA_ATT_C; i++) { vga_io_r(VGA_IS1_RC); /* reset flip-flop */ vga_io_wattr(i, atc[i]); } /* Wait for screen to stabilize. */ mdelay(50); vga_io_wseq(VGA_SEQ_CLOCK_MODE, seq[VGA_SEQ_CLOCK_MODE]); vga_io_r(VGA_IS1_RC); vga_io_w(VGA_ATT_IW, 0x20); vga16fb_update_fix(info); return 0; } static void ega16_setpalette(int regno, unsigned red, unsigned green, unsigned blue) { static const unsigned char map[] = { 000, 001, 010, 011 }; int val; if (regno >= 16) return; val = map[red>>14] | ((map[green>>14]) << 1) | ((map[blue>>14]) << 2); vga_io_r(VGA_IS1_RC); /* ! 0x3BA */ vga_io_wattr(regno, val); vga_io_r(VGA_IS1_RC); /* some clones need it */ vga_io_w(VGA_ATT_IW, 0x20); /* unblank screen */ } static void vga16_setpalette(int regno, unsigned red, unsigned green, unsigned blue) { outb(regno, VGA_PEL_IW); outb(red >> 10, VGA_PEL_D); outb(green >> 10, VGA_PEL_D); outb(blue >> 10, VGA_PEL_D); } static int vga16fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *info) { struct vga16fb_par *par = info->par; 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 >= 256) return 1; gray = info->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 (par->isVGA) vga16_setpalette(regno,red,green,blue); else ega16_setpalette(regno,red,green,blue); return 0; } static int vga16fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info) { vga16fb_pan_var(info, var); return 0; } /* 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. */ static void vga_vesa_blank(struct vga16fb_par *par, int mode) { unsigned char SeqCtrlIndex = vga_io_r(VGA_SEQ_I); unsigned char CrtCtrlIndex = vga_io_r(VGA_CRT_IC); /* save original values of VGA controller registers */ if(!par->vesa_blanked) { par->vga_state.CrtMiscIO = vga_io_r(VGA_MIS_R); //sti(); par->vga_state.HorizontalTotal = vga_io_rcrt(0x00); /* HorizontalTotal */ par->vga_state.HorizDisplayEnd = vga_io_rcrt(0x01); /* HorizDisplayEnd */ par->vga_state.StartHorizRetrace = vga_io_rcrt(0x04); /* StartHorizRetrace */ par->vga_state.EndHorizRetrace = vga_io_rcrt(0x05); /* EndHorizRetrace */ par->vga_state.Overflow = vga_io_rcrt(0x07); /* Overflow */ par->vga_state.StartVertRetrace = vga_io_rcrt(0x10); /* StartVertRetrace */ par->vga_state.EndVertRetrace = vga_io_rcrt(0x11); /* EndVertRetrace */ par->vga_state.ModeControl = vga_io_rcrt(0x17); /* ModeControl */ par->vga_state.ClockingMode = vga_io_rseq(0x01); /* ClockingMode */ } /* assure that video is enabled */ /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */ vga_io_wseq(0x01, par->vga_state.ClockingMode | 0x20); /* test for vertical retrace in process.... */ if ((par->vga_state.CrtMiscIO & 0x80) == 0x80) vga_io_w(VGA_MIS_W, par->vga_state.CrtMiscIO & 0xef); /* * 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 & FB_BLANK_VSYNC_SUSPEND) { vga_io_wcrt(VGA_CRTC_V_SYNC_START, 0xff); vga_io_wcrt(VGA_CRTC_V_SYNC_END, 0x40); /* bits 9,10 of vert. retrace */ vga_io_wcrt(VGA_CRTC_OVERFLOW, par->vga_state.Overflow | 0x84); } if (mode & FB_BLANK_HSYNC_SUSPEND) { /* * Set <End of horizontal retrace> to minimum (0) and * <Start of horizontal Retrace> to maximum * Result: turn off horizontal sync (HSync) pulse. */ vga_io_wcrt(VGA_CRTC_H_SYNC_START, 0xff); vga_io_wcrt(VGA_CRTC_H_SYNC_END, 0x00); } /* restore both index registers */ outb_p(SeqCtrlIndex, VGA_SEQ_I); outb_p(CrtCtrlIndex, VGA_CRT_IC); } static void vga_vesa_unblank(struct vga16fb_par *par) { unsigned char SeqCtrlIndex = vga_io_r(VGA_SEQ_I); unsigned char CrtCtrlIndex = vga_io_r(VGA_CRT_IC); /* restore original values of VGA controller registers */ vga_io_w(VGA_MIS_W, par->vga_state.CrtMiscIO); /* HorizontalTotal */ vga_io_wcrt(0x00, par->vga_state.HorizontalTotal); /* HorizDisplayEnd */ vga_io_wcrt(0x01, par->vga_state.HorizDisplayEnd); /* StartHorizRetrace */ vga_io_wcrt(0x04, par->vga_state.StartHorizRetrace); /* EndHorizRetrace */ vga_io_wcrt(0x05, par->vga_state.EndHorizRetrace); /* Overflow */ vga_io_wcrt(0x07, par->vga_state.Overflow); /* StartVertRetrace */ vga_io_wcrt(0x10, par->vga_state.StartVertRetrace); /* EndVertRetrace */ vga_io_wcrt(0x11, par->vga_state.EndVertRetrace); /* ModeControl */ vga_io_wcrt(0x17, par->vga_state.ModeControl); /* ClockingMode */ vga_io_wseq(0x01, par->vga_state.ClockingMode); /* restore index/control registers */ vga_io_w(VGA_SEQ_I, SeqCtrlIndex); vga_io_w(VGA_CRT_IC, CrtCtrlIndex); } static void vga_pal_blank(void) { int i; for (i=0; i<16; i++) { outb_p(i, VGA_PEL_IW); outb_p(0, VGA_PEL_D); outb_p(0, VGA_PEL_D); outb_p(0, VGA_PEL_D); } } /* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */ static int vga16fb_blank(int blank, struct fb_info *info) { struct vga16fb_par *par = info->par; switch (blank) { case FB_BLANK_UNBLANK: /* Unblank */ if (par->vesa_blanked) { vga_vesa_unblank(par); par->vesa_blanked = 0; } if (par->palette_blanked) { par->palette_blanked = 0; } break; case FB_BLANK_NORMAL: /* blank */ vga_pal_blank(); par->palette_blanked = 1; break; default: /* VESA blanking */ vga_vesa_blank(par, blank); par->vesa_blanked = 1; break; } return 0; } static void vga_8planes_fillrect(struct fb_info *info, const struct fb_fillrect *rect) { u32 dx = rect->dx, width = rect->width; char oldindex = getindex(); char oldmode = setmode(0x40); char oldmask = selectmask(); int line_ofs, height; char oldop, oldsr; char __iomem *where; dx /= 4; where = info->screen_base + dx + rect->dy * info->fix.line_length; if (rect->rop == ROP_COPY) { oldop = setop(0); oldsr = setsr(0); width /= 4; line_ofs = info->fix.line_length - width; setmask(0xff); height = rect->height; while (height--) { int x; /* we can do memset... */ for (x = width; x > 0; --x) { writeb(rect->color, where); where++; } where += line_ofs; } } else { char oldcolor = setcolor(0xf); int y; oldop = setop(0x18); oldsr = setsr(0xf); setmask(0x0F); for (y = 0; y < rect->height; y++) { rmw(where); rmw(where+1); where += info->fix.line_length; } setcolor(oldcolor); } setmask(oldmask); setsr(oldsr); setop(oldop); setmode(oldmode); setindex(oldindex); } static void vga16fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect) { int x, x2, y2, vxres, vyres, width, height, line_ofs; char __iomem *dst; vxres = info->var.xres_virtual; vyres = info->var.yres_virtual; if (!rect->width || !rect->height || rect->dx > vxres || rect->dy > vyres) return; /* We could use hardware clipping but on many cards you get around * hardware clipping by writing to framebuffer directly. */ x2 = rect->dx + rect->width; y2 = rect->dy + rect->height; x2 = x2 < vxres ? x2 : vxres; y2 = y2 < vyres ? y2 : vyres; width = x2 - rect->dx; switch (info->fix.type) { case FB_TYPE_VGA_PLANES: if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) { height = y2 - rect->dy; width = rect->width/8; line_ofs = info->fix.line_length - width; dst = info->screen_base + (rect->dx/8) + rect->dy * info->fix.line_length; switch (rect->rop) { case ROP_COPY: setmode(0); setop(0); setsr(0xf); setcolor(rect->color); selectmask(); setmask(0xff); while (height--) { for (x = 0; x < width; x++) { writeb(0, dst); dst++; } dst += line_ofs; } break; case ROP_XOR: setmode(0); setop(0x18); setsr(0xf); setcolor(0xf); selectmask(); setmask(0xff); while (height--) { for (x = 0; x < width; x++) { rmw(dst); dst++; } dst += line_ofs; } break; } } else vga_8planes_fillrect(info, rect); break; case FB_TYPE_PACKED_PIXELS: default: cfb_fillrect(info, rect); break; } } static void vga_8planes_copyarea(struct fb_info *info, const struct fb_copyarea *area) { char oldindex = getindex(); char oldmode = setmode(0x41); char oldop = setop(0); char oldsr = setsr(0xf); int height, line_ofs, x; u32 sx, dx, width; char __iomem *dest; char __iomem *src; height = area->height; sx = area->sx / 4; dx = area->dx / 4; width = area->width / 4; if (area->dy < area->sy || (area->dy == area->sy && dx < sx)) { line_ofs = info->fix.line_length - width; dest = info->screen_base + dx + area->dy * info->fix.line_length; src = info->screen_base + sx + area->sy * info->fix.line_length; while (height--) { for (x = 0; x < width; x++) { readb(src); writeb(0, dest); src++; dest++; } src += line_ofs; dest += line_ofs; } } else { line_ofs = info->fix.line_length - width; dest = info->screen_base + dx + width + (area->dy + height - 1) * info->fix.line_length; src = info->screen_base + sx + width + (area->sy + height - 1) * info->fix.line_length; while (height--) { for (x = 0; x < width; x++) { --src; --dest; readb(src); writeb(0, dest); } src -= line_ofs; dest -= line_ofs; } } setsr(oldsr); setop(oldop); setmode(oldmode); setindex(oldindex); } static void vga16fb_copyarea(struct fb_info *info, const struct fb_copyarea *area) { u32 dx = area->dx, dy = area->dy, sx = area->sx, sy = area->sy; int x, x2, y2, old_dx, old_dy, vxres, vyres; int height, width, line_ofs; char __iomem *dst = NULL; char __iomem *src = NULL; vxres = info->var.xres_virtual; vyres = info->var.yres_virtual; if (area->dx > vxres || area->sx > vxres || area->dy > vyres || area->sy > vyres) return; /* clip the destination */ old_dx = area->dx; old_dy = area->dy; /* * We could use hardware clipping but on many cards you get around * hardware clipping by writing to framebuffer directly. */ x2 = area->dx + area->width; y2 = area->dy + area->height; dx = area->dx > 0 ? area->dx : 0; dy = area->dy > 0 ? area->dy : 0; x2 = x2 < vxres ? x2 : vxres; y2 = y2 < vyres ? y2 : vyres; width = x2 - dx; height = y2 - dy; if (sx + dx < old_dx || sy + dy < old_dy) return; /* update sx1,sy1 */ sx += (dx - old_dx); sy += (dy - old_dy); /* the source must be completely inside the virtual screen */ if (sx + width > vxres || sy + height > vyres) return; switch (info->fix.type) { case FB_TYPE_VGA_PLANES: if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) { width = width/8; line_ofs = info->fix.line_length - width; setmode(1); setop(0); setsr(0xf); if (dy < sy || (dy == sy && dx < sx)) { dst = info->screen_base + (dx/8) + dy * info->fix.line_length; src = info->screen_base + (sx/8) + sy * info->fix.line_length; while (height--) { for (x = 0; x < width; x++) { readb(src); writeb(0, dst); dst++; src++; } src += line_ofs; dst += line_ofs; } } else { dst = info->screen_base + (dx/8) + width + (dy + height - 1) * info->fix.line_length; src = info->screen_base + (sx/8) + width + (sy + height - 1) * info->fix.line_length; while (height--) { for (x = 0; x < width; x++) { dst--; src--; readb(src); writeb(0, dst); } src -= line_ofs; dst -= line_ofs; } } } else vga_8planes_copyarea(info, area); break; case FB_TYPE_PACKED_PIXELS: default: cfb_copyarea(info, area); break; } } #define TRANS_MASK_LOW {0x0,0x8,0x4,0xC,0x2,0xA,0x6,0xE,0x1,0x9,0x5,0xD,0x3,0xB,0x7,0xF} #define TRANS_MASK_HIGH {0x000, 0x800, 0x400, 0xC00, 0x200, 0xA00, 0x600, 0xE00, \ 0x100, 0x900, 0x500, 0xD00, 0x300, 0xB00, 0x700, 0xF00} #if defined(__LITTLE_ENDIAN) static const u16 transl_l[] = TRANS_MASK_LOW; static const u16 transl_h[] = TRANS_MASK_HIGH; #elif defined(__BIG_ENDIAN) static const u16 transl_l[] = TRANS_MASK_HIGH; static const u16 transl_h[] = TRANS_MASK_LOW; #else #error "Only __BIG_ENDIAN and __LITTLE_ENDIAN are supported in vga-planes" #endif static void vga_8planes_imageblit(struct fb_info *info, const struct fb_image *image) { char oldindex = getindex(); char oldmode = setmode(0x40); char oldop = setop(0); char oldsr = setsr(0); char oldmask = selectmask(); const char *cdat = image->data; u32 dx = image->dx; char __iomem *where; int y; dx /= 4; where = info->screen_base + dx + image->dy * info->fix.line_length; setmask(0xff); writeb(image->bg_color, where); readb(where); selectmask(); setmask(image->fg_color ^ image->bg_color); setmode(0x42); setop(0x18); for (y = 0; y < image->height; y++, where += info->fix.line_length) writew(transl_h[cdat[y]&0xF] | transl_l[cdat[y] >> 4], where); setmask(oldmask); setsr(oldsr); setop(oldop); setmode(oldmode); setindex(oldindex); } static void vga_imageblit_expand(struct fb_info *info, const struct fb_image *image) { char __iomem *where = info->screen_base + (image->dx/8) + image->dy * info->fix.line_length; struct vga16fb_par *par = info->par; char *cdat = (char *) image->data; char __iomem *dst; int x, y; switch (info->fix.type) { case FB_TYPE_VGA_PLANES: if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) { if (par->isVGA) { setmode(2); setop(0); setsr(0xf); setcolor(image->fg_color); selectmask(); setmask(0xff); writeb(image->bg_color, where); rmb(); readb(where); /* fill latches */ setmode(3); wmb(); for (y = 0; y < image->height; y++) { dst = where; for (x = image->width/8; x--;) writeb(*cdat++, dst++); where += info->fix.line_length; } wmb(); } else { setmode(0); setop(0); setsr(0xf); setcolor(image->bg_color); selectmask(); setmask(0xff); for (y = 0; y < image->height; y++) { dst = where; for (x=image->width/8; x--;){ rmw(dst); setcolor(image->fg_color); selectmask(); if (*cdat) { setmask(*cdat++); rmw(dst++); } } where += info->fix.line_length; } } } else vga_8planes_imageblit(info, image); break; case FB_TYPE_PACKED_PIXELS: default: cfb_imageblit(info, image); break; } } static void vga_imageblit_color(struct fb_info *info, const struct fb_image *image) { /* * Draw logo */ struct vga16fb_par *par = info->par; char __iomem *where = info->screen_base + image->dy * info->fix.line_length + image->dx/8; const char *cdat = image->data; char __iomem *dst; int x, y; switch (info->fix.type) { case FB_TYPE_VGA_PLANES: if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4 && par->isVGA) { setsr(0xf); setop(0); setmode(0); for (y = 0; y < image->height; y++) { for (x = 0; x < image->width; x++) { dst = where + x/8; setcolor(*cdat); selectmask(); setmask(1 << (7 - (x % 8))); fb_readb(dst); fb_writeb(0, dst); cdat++; } where += info->fix.line_length; } } break; case FB_TYPE_PACKED_PIXELS: cfb_imageblit(info, image); break; default: break; } } static void vga16fb_imageblit(struct fb_info *info, const struct fb_image *image) { if (image->depth == 1) vga_imageblit_expand(info, image); else vga_imageblit_color(info, image); } static void vga16fb_destroy(struct fb_info *info) { iounmap(info->screen_base); fb_dealloc_cmap(&info->cmap); /* XXX unshare VGA regions */ framebuffer_release(info); } static struct fb_ops vga16fb_ops = { .owner = THIS_MODULE, .fb_open = vga16fb_open, .fb_release = vga16fb_release, .fb_destroy = vga16fb_destroy, .fb_check_var = vga16fb_check_var, .fb_set_par = vga16fb_set_par, .fb_setcolreg = vga16fb_setcolreg, .fb_pan_display = vga16fb_pan_display, .fb_blank = vga16fb_blank, .fb_fillrect = vga16fb_fillrect, .fb_copyarea = vga16fb_copyarea, .fb_imageblit = vga16fb_imageblit, }; #ifndef MODULE static int __init vga16fb_setup(char *options) { char *this_opt; if (!options || !*options) return 0; while ((this_opt = strsep(&options, ",")) != NULL) { if (!*this_opt) continue; } return 0; } #endif static int vga16fb_probe(struct platform_device *dev) { struct fb_info *info; struct vga16fb_par *par; int i; int ret = 0; printk(KERN_DEBUG "vga16fb: initializing\n"); info = framebuffer_alloc(sizeof(struct vga16fb_par), &dev->dev); if (!info) { ret = -ENOMEM; goto err_fb_alloc; } info->apertures = alloc_apertures(1); if (!info->apertures) { ret = -ENOMEM; goto err_ioremap; } /* XXX share VGA_FB_PHYS and I/O region with vgacon and others */ info->screen_base = (void __iomem *)VGA_MAP_MEM(VGA_FB_PHYS, 0); if (!info->screen_base) { printk(KERN_ERR "vga16fb: unable to map device\n"); ret = -ENOMEM; goto err_ioremap; } printk(KERN_INFO "vga16fb: mapped to 0x%p\n", info->screen_base); par = info->par; par->isVGA = screen_info.orig_video_isVGA; par->palette_blanked = 0; par->vesa_blanked = 0; i = par->isVGA? 6 : 2; vga16fb_defined.red.length = i; vga16fb_defined.green.length = i; vga16fb_defined.blue.length = i; /* name should not depend on EGA/VGA */ info->fbops = &vga16fb_ops; info->var = vga16fb_defined; info->fix = vga16fb_fix; /* supports rectangles with widths of multiples of 8 */ info->pixmap.blit_x = 1 << 7 | 1 << 15 | 1 << 23 | 1 << 31; info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE | FBINFO_HWACCEL_YPAN; i = (info->var.bits_per_pixel == 8) ? 256 : 16; ret = fb_alloc_cmap(&info->cmap, i, 0); if (ret) { printk(KERN_ERR "vga16fb: unable to allocate colormap\n"); ret = -ENOMEM; goto err_alloc_cmap; } if (vga16fb_check_var(&info->var, info)) { printk(KERN_ERR "vga16fb: unable to validate variable\n"); ret = -EINVAL; goto err_check_var; } vga16fb_update_fix(info); info->apertures->ranges[0].base = VGA_FB_PHYS; info->apertures->ranges[0].size = VGA_FB_PHYS_LEN; if (register_framebuffer(info) < 0) { printk(KERN_ERR "vga16fb: unable to register framebuffer\n"); ret = -EINVAL; goto err_check_var; } fb_info(info, "%s frame buffer device\n", info->fix.id); platform_set_drvdata(dev, info); return 0; err_check_var: fb_dealloc_cmap(&info->cmap); err_alloc_cmap: iounmap(info->screen_base); err_ioremap: framebuffer_release(info); err_fb_alloc: return ret; } static int vga16fb_remove(struct platform_device *dev) { struct fb_info *info = platform_get_drvdata(dev); if (info) unregister_framebuffer(info); return 0; } static struct platform_driver vga16fb_driver = { .probe = vga16fb_probe, .remove = vga16fb_remove, .driver = { .name = "vga16fb", }, }; static struct platform_device *vga16fb_device; static int __init vga16fb_init(void) { int ret; #ifndef MODULE char *option = NULL; if (fb_get_options("vga16fb", &option)) return -ENODEV; vga16fb_setup(option); #endif ret = platform_driver_register(&vga16fb_driver); if (!ret) { vga16fb_device = platform_device_alloc("vga16fb", 0); if (vga16fb_device) ret = platform_device_add(vga16fb_device); else ret = -ENOMEM; if (ret) { platform_device_put(vga16fb_device); platform_driver_unregister(&vga16fb_driver); } } return ret; } static void __exit vga16fb_exit(void) { platform_device_unregister(vga16fb_device); platform_driver_unregister(&vga16fb_driver); } MODULE_DESCRIPTION("Legacy VGA framebuffer device driver"); MODULE_LICENSE("GPL"); module_init(vga16fb_init); module_exit(vga16fb_exit); /* * Overrides for Emacs so that we follow Linus's tabbing style. * --------------------------------------------------------------------------- * Local variables: * c-basic-offset: 8 * End: */