/* * framebuffer driver for VBE 2.0 compliant graphic boards * * switching to graphics mode happens at boot time (while * running in real mode, see arch/i386/boot/video.S). * * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de> * */ #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/ioport.h> #include <linux/init.h> #include <asm/io.h> #include <asm/mtrr.h> #define dac_reg (0x3c8) #define dac_val (0x3c9) /* --------------------------------------------------------------------- */ static struct fb_var_screeninfo vesafb_defined __initdata = { .activate = FB_ACTIVATE_NOW, .height = -1, .width = -1, .right_margin = 32, .upper_margin = 16, .lower_margin = 4, .vsync_len = 4, .vmode = FB_VMODE_NONINTERLACED, }; static struct fb_fix_screeninfo vesafb_fix __initdata = { .id = "VESA VGA", .type = FB_TYPE_PACKED_PIXELS, .accel = FB_ACCEL_NONE, }; static struct fb_info fb_info; static u32 pseudo_palette[17]; static int inverse = 0; static int mtrr = 0; static int pmi_setpal = 0; /* pmi for palette changes ??? */ static int ypan = 0; /* 0..nothing, 1..ypan, 2..ywrap */ static unsigned short *pmi_base = 0; static void (*pmi_start)(void); static void (*pmi_pal)(void); /* --------------------------------------------------------------------- */ static int vesafb_pan_display(struct fb_var_screeninfo *var, int con, struct fb_info *info) { int offset; if (!ypan) return -EINVAL; if (var->xoffset) return -EINVAL; if (var->yoffset > var->yres_virtual) return -EINVAL; if ((ypan==1) && var->yoffset+var->yres > var->yres_virtual) return -EINVAL; offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4; __asm__ __volatile__( "call *(%%edi)" : /* no return value */ : "a" (0x4f07), /* EAX */ "b" (0), /* EBX */ "c" (offset), /* ECX */ "d" (offset >> 16), /* EDX */ "D" (&pmi_start)); /* EDI */ return 0; } static void vesa_setpalette(int regno, unsigned red, unsigned green, unsigned blue) { struct { u_char blue, green, red, pad; } entry; if (pmi_setpal) { entry.red = red >> 10; entry.green = green >> 10; entry.blue = blue >> 10; entry.pad = 0; __asm__ __volatile__( "call *(%%esi)" : /* no return value */ : "a" (0x4f09), /* EAX */ "b" (0), /* EBX */ "c" (1), /* ECX */ "d" (regno), /* EDX */ "D" (&entry), /* EDI */ "S" (&pmi_pal)); /* ESI */ } else { /* without protected mode interface, try VGA registers... */ outb_p(regno, dac_reg); outb_p(red >> 10, dac_val); outb_p(green >> 10, dac_val); outb_p(blue >> 10, dac_val); } } static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *info) { /* * 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 >= info->cmap.len) return 1; switch (info->var.bits_per_pixel) { case 8: vesa_setpalette(regno,red,green,blue); break; case 16: if (info->var.red.offset == 10) { /* 1:5:5:5 */ ((u32*) (info->pseudo_palette))[regno] = ((red & 0xf800) >> 1) | ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); } else { /* 0:5:6:5 */ ((u32*) (info->pseudo_palette))[regno] = ((red & 0xf800) ) | ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); } break; case 24: red >>= 8; green >>= 8; blue >>= 8; ((u32 *)(info->pseudo_palette))[regno] = (red << info->var.red.offset) | (green << info->var.green.offset) | (blue << info->var.blue.offset); break; case 32: red >>= 8; green >>= 8; blue >>= 8; ((u32 *)(info->pseudo_palette))[regno] = (red << info->var.red.offset) | (green << info->var.green.offset) | (blue << info->var.blue.offset); break; } return 0; } static struct fb_ops vesafb_ops = { .owner = THIS_MODULE, .fb_set_var = gen_set_var, .fb_setcolreg = vesafb_setcolreg, .fb_pan_display = vesafb_pan_display, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, }; int __init vesafb_setup(char *options) { char *this_opt; fb_info.fontname[0] = '\0'; if (!options || !*options) return 0; while ((this_opt = strsep(&options, ",")) != NULL) { if (!*this_opt) continue; if (! strcmp(this_opt, "inverse")) inverse=1; else if (! strcmp(this_opt, "redraw")) ypan=0; else if (! strcmp(this_opt, "ypan")) ypan=1; else if (! strcmp(this_opt, "ywrap")) ypan=2; else if (! strcmp(this_opt, "vgapal")) pmi_setpal=0; else if (! strcmp(this_opt, "pmipal")) pmi_setpal=1; else if (! strcmp(this_opt, "mtrr")) mtrr=1; else if (!strncmp(this_opt, "font:", 5)) strcpy(fb_info.fontname, this_opt+5); } return 0; } int __init vesafb_init(void) { int video_cmap_len; int i; if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB) return -ENXIO; vesafb_fix.smem_start = screen_info.lfb_base; vesafb_defined.bits_per_pixel = screen_info.lfb_depth; if (15 == vesafb_defined.bits_per_pixel) vesafb_defined.bits_per_pixel = 16; vesafb_defined.xres = screen_info.lfb_width; vesafb_defined.yres = screen_info.lfb_height; vesafb_fix.line_length = screen_info.lfb_linelength; vesafb_fix.smem_len = screen_info.lfb_size * 65536; vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR; if (!request_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len, "vesafb")) { printk(KERN_WARNING "vesafb: abort, cannot reserve video memory at 0x%lx\n", vesafb_fix.smem_start); /* We cannot make this fatal. Sometimes this comes from magic spaces our resource handlers simply don't know about */ } fb_info.screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len); if (!fb_info.screen_base) { release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len); printk(KERN_ERR "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n", vesafb_fix.smem_len, vesafb_fix.smem_start); return -EIO; } printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, size %dk\n", vesafb_fix.smem_start, fb_info.screen_base, vesafb_fix.smem_len/1024); printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n", vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages); if (screen_info.vesapm_seg) { printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n", screen_info.vesapm_seg,screen_info.vesapm_off); } if (screen_info.vesapm_seg < 0xc000) ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */ if (ypan || pmi_setpal) { pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off); pmi_start = (void*)((char*)pmi_base + pmi_base[1]); pmi_pal = (void*)((char*)pmi_base + pmi_base[2]); printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal); if (pmi_base[3]) { printk(KERN_INFO "vesafb: pmi: ports = "); for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++) printk("%x ",pmi_base[i]); printk("\n"); if (pmi_base[i] != 0xffff) { /* * memory areas not supported (yet?) * * Rules are: we have to set up a descriptor for the requested * memory area and pass it in the ES register to the BIOS function. */ printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n"); ypan = pmi_setpal = 0; } } } vesafb_defined.xres_virtual = vesafb_defined.xres; vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length; if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) { printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n", (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual); } else { printk(KERN_INFO "vesafb: scrolling: redraw\n"); vesafb_defined.yres_virtual = vesafb_defined.yres; ypan = 0; } /* some dummy values for timing to make fbset happy */ vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres; vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8; vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8; if (vesafb_defined.bits_per_pixel > 8) { vesafb_defined.red.offset = screen_info.red_pos; vesafb_defined.red.length = screen_info.red_size; vesafb_defined.green.offset = screen_info.green_pos; vesafb_defined.green.length = screen_info.green_size; vesafb_defined.blue.offset = screen_info.blue_pos; vesafb_defined.blue.length = screen_info.blue_size; vesafb_defined.transp.offset = screen_info.rsvd_pos; vesafb_defined.transp.length = screen_info.rsvd_size; printk(KERN_INFO "vesafb: directcolor: " "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", screen_info.rsvd_size, screen_info.red_size, screen_info.green_size, screen_info.blue_size, screen_info.rsvd_pos, screen_info.red_pos, screen_info.green_pos, screen_info.blue_pos); video_cmap_len = 16; } else { vesafb_defined.red.length = 6; vesafb_defined.green.length = 6; vesafb_defined.blue.length = 6; video_cmap_len = 256; } vesafb_fix.ypanstep = ypan ? 1 : 0; vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0; /* request failure does not faze us, as vgacon probably has this * region already (FIXME) */ request_region(0x3c0, 32, "vesafb"); if (mtrr) { int temp_size = vesafb_fix.smem_len; /* Find the largest power-of-two */ while (temp_size & (temp_size - 1)) temp_size &= (temp_size - 1); /* Try and find a power of two to add */ while (temp_size && mtrr_add(vesafb_fix.smem_start, temp_size, MTRR_TYPE_WRCOMB, 1)==-EINVAL) { temp_size >>= 1; } } fb_info.node = NODEV; fb_info.fbops = &vesafb_ops; fb_info.var = vesafb_defined; fb_info.fix = vesafb_fix; fb_info.currcon = -1; fb_info.updatevar = gen_update_var; fb_info.pseudo_palette = pseudo_palette; fb_info.flags = FBINFO_FLAG_DEFAULT; fb_alloc_cmap(&fb_info.cmap, video_cmap_len, 0); if (register_framebuffer(&fb_info)<0) return -EINVAL; printk(KERN_INFO "fb%d: %s frame buffer device\n", GET_FB_IDX(fb_info.node), fb_info.fix.id); return 0; } /* * Overrides for Emacs so that we follow Linus's tabbing style. * --------------------------------------------------------------------------- * Local variables: * c-basic-offset: 8 * End: */ MODULE_LICENSE("GPL");