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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * framebuffer driver for VBE 2.0 compliant graphic boards
0004  *
0005  * switching to graphics mode happens at boot time (while
0006  * running in real mode, see arch/i386/boot/video.S).
0007  *
0008  * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
0009  *
0010  */
0011 
0012 #include <linux/module.h>
0013 #include <linux/kernel.h>
0014 #include <linux/errno.h>
0015 #include <linux/string.h>
0016 #include <linux/mm.h>
0017 #include <linux/delay.h>
0018 #include <linux/fb.h>
0019 #include <linux/ioport.h>
0020 #include <linux/init.h>
0021 #include <linux/platform_device.h>
0022 #include <linux/screen_info.h>
0023 #include <linux/io.h>
0024 
0025 #include <video/vga.h>
0026 
0027 #define dac_reg (0x3c8)
0028 #define dac_val (0x3c9)
0029 
0030 /* --------------------------------------------------------------------- */
0031 
0032 struct vesafb_par {
0033     u32 pseudo_palette[256];
0034     int wc_cookie;
0035     struct resource *region;
0036 };
0037 
0038 static struct fb_var_screeninfo vesafb_defined = {
0039     .activate   = FB_ACTIVATE_NOW,
0040     .height     = -1,
0041     .width      = -1,
0042     .right_margin   = 32,
0043     .upper_margin   = 16,
0044     .lower_margin   = 4,
0045     .vsync_len  = 4,
0046     .vmode      = FB_VMODE_NONINTERLACED,
0047 };
0048 
0049 static struct fb_fix_screeninfo vesafb_fix = {
0050     .id = "VESA VGA",
0051     .type   = FB_TYPE_PACKED_PIXELS,
0052     .accel  = FB_ACCEL_NONE,
0053 };
0054 
0055 static int   inverse    __read_mostly;
0056 static int   mtrr       __read_mostly;      /* disable mtrr */
0057 static int   vram_remap;            /* Set amount of memory to be used */
0058 static int   vram_total;            /* Set total amount of memory */
0059 static int   pmi_setpal __read_mostly = 1;  /* pmi for palette changes ??? */
0060 static int   ypan       __read_mostly;      /* 0..nothing, 1..ypan, 2..ywrap */
0061 static void  (*pmi_start)(void) __read_mostly;
0062 static void  (*pmi_pal)  (void) __read_mostly;
0063 static int   depth      __read_mostly;
0064 static int   vga_compat __read_mostly;
0065 /* --------------------------------------------------------------------- */
0066 
0067 static int vesafb_pan_display(struct fb_var_screeninfo *var,
0068                               struct fb_info *info)
0069 {
0070 #ifdef __i386__
0071     int offset;
0072 
0073     offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
0074 
0075         __asm__ __volatile__(
0076                 "call *(%%edi)"
0077                 : /* no return value */
0078                 : "a" (0x4f07),         /* EAX */
0079                   "b" (0),              /* EBX */
0080                   "c" (offset),         /* ECX */
0081                   "d" (offset >> 16),   /* EDX */
0082                   "D" (&pmi_start));    /* EDI */
0083 #endif
0084     return 0;
0085 }
0086 
0087 static int vesa_setpalette(int regno, unsigned red, unsigned green,
0088                 unsigned blue)
0089 {
0090     int shift = 16 - depth;
0091     int err = -EINVAL;
0092 
0093 /*
0094  * Try VGA registers first...
0095  */
0096     if (vga_compat) {
0097         outb_p(regno,       dac_reg);
0098         outb_p(red   >> shift, dac_val);
0099         outb_p(green >> shift, dac_val);
0100         outb_p(blue  >> shift, dac_val);
0101         err = 0;
0102     }
0103 
0104 #ifdef __i386__
0105 /*
0106  * Fallback to the PMI....
0107  */
0108     if (err && pmi_setpal) {
0109         struct { u_char blue, green, red, pad; } entry;
0110 
0111         entry.red   = red   >> shift;
0112         entry.green = green >> shift;
0113         entry.blue  = blue  >> shift;
0114         entry.pad   = 0;
0115             __asm__ __volatile__(
0116                 "call *(%%esi)"
0117                 : /* no return value */
0118                 : "a" (0x4f09),         /* EAX */
0119                   "b" (0),              /* EBX */
0120                   "c" (1),              /* ECX */
0121                   "d" (regno),          /* EDX */
0122                   "D" (&entry),         /* EDI */
0123                   "S" (&pmi_pal));      /* ESI */
0124         err = 0;
0125     }
0126 #endif
0127 
0128     return err;
0129 }
0130 
0131 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
0132                 unsigned blue, unsigned transp,
0133                 struct fb_info *info)
0134 {
0135     int err = 0;
0136 
0137     /*
0138      *  Set a single color register. The values supplied are
0139      *  already rounded down to the hardware's capabilities
0140      *  (according to the entries in the `var' structure). Return
0141      *  != 0 for invalid regno.
0142      */
0143     
0144     if (regno >= info->cmap.len)
0145         return 1;
0146 
0147     if (info->var.bits_per_pixel == 8)
0148         err = vesa_setpalette(regno,red,green,blue);
0149     else if (regno < 16) {
0150         switch (info->var.bits_per_pixel) {
0151         case 16:
0152             if (info->var.red.offset == 10) {
0153                 /* 1:5:5:5 */
0154                 ((u32*) (info->pseudo_palette))[regno] =
0155                     ((red   & 0xf800) >>  1) |
0156                     ((green & 0xf800) >>  6) |
0157                     ((blue  & 0xf800) >> 11);
0158             } else {
0159                 /* 0:5:6:5 */
0160                 ((u32*) (info->pseudo_palette))[regno] =
0161                     ((red   & 0xf800)      ) |
0162                     ((green & 0xfc00) >>  5) |
0163                     ((blue  & 0xf800) >> 11);
0164             }
0165             break;
0166         case 24:
0167         case 32:
0168             red   >>= 8;
0169             green >>= 8;
0170             blue  >>= 8;
0171             ((u32 *)(info->pseudo_palette))[regno] =
0172                 (red   << info->var.red.offset)   |
0173                 (green << info->var.green.offset) |
0174                 (blue  << info->var.blue.offset);
0175             break;
0176         }
0177     }
0178 
0179     return err;
0180 }
0181 
0182 /*
0183  * fb_ops.fb_destroy is called by the last put_fb_info() call at the end
0184  * of unregister_framebuffer() or fb_release(). Do any cleanup here.
0185  */
0186 static void vesafb_destroy(struct fb_info *info)
0187 {
0188     struct vesafb_par *par = info->par;
0189 
0190     fb_dealloc_cmap(&info->cmap);
0191     arch_phys_wc_del(par->wc_cookie);
0192     if (info->screen_base)
0193         iounmap(info->screen_base);
0194     release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
0195 
0196     framebuffer_release(info);
0197 }
0198 
0199 static struct fb_ops vesafb_ops = {
0200     .owner      = THIS_MODULE,
0201     .fb_destroy     = vesafb_destroy,
0202     .fb_setcolreg   = vesafb_setcolreg,
0203     .fb_pan_display = vesafb_pan_display,
0204     .fb_fillrect    = cfb_fillrect,
0205     .fb_copyarea    = cfb_copyarea,
0206     .fb_imageblit   = cfb_imageblit,
0207 };
0208 
0209 static int vesafb_setup(char *options)
0210 {
0211     char *this_opt;
0212     
0213     if (!options || !*options)
0214         return 0;
0215     
0216     while ((this_opt = strsep(&options, ",")) != NULL) {
0217         if (!*this_opt) continue;
0218         
0219         if (! strcmp(this_opt, "inverse"))
0220             inverse=1;
0221         else if (! strcmp(this_opt, "redraw"))
0222             ypan=0;
0223         else if (! strcmp(this_opt, "ypan"))
0224             ypan=1;
0225         else if (! strcmp(this_opt, "ywrap"))
0226             ypan=2;
0227         else if (! strcmp(this_opt, "vgapal"))
0228             pmi_setpal=0;
0229         else if (! strcmp(this_opt, "pmipal"))
0230             pmi_setpal=1;
0231         else if (! strncmp(this_opt, "mtrr:", 5))
0232             mtrr = simple_strtoul(this_opt+5, NULL, 0);
0233         else if (! strcmp(this_opt, "nomtrr"))
0234             mtrr=0;
0235         else if (! strncmp(this_opt, "vtotal:", 7))
0236             vram_total = simple_strtoul(this_opt+7, NULL, 0);
0237         else if (! strncmp(this_opt, "vremap:", 7))
0238             vram_remap = simple_strtoul(this_opt+7, NULL, 0);
0239     }
0240     return 0;
0241 }
0242 
0243 static int vesafb_probe(struct platform_device *dev)
0244 {
0245     struct fb_info *info;
0246     struct vesafb_par *par;
0247     int i, err;
0248     unsigned int size_vmode;
0249     unsigned int size_remap;
0250     unsigned int size_total;
0251     char *option = NULL;
0252 
0253     /* ignore error return of fb_get_options */
0254     fb_get_options("vesafb", &option);
0255     vesafb_setup(option);
0256 
0257     if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
0258         return -ENODEV;
0259 
0260     vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
0261     vesafb_fix.smem_start = screen_info.lfb_base;
0262     vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
0263     if (15 == vesafb_defined.bits_per_pixel)
0264         vesafb_defined.bits_per_pixel = 16;
0265     vesafb_defined.xres = screen_info.lfb_width;
0266     vesafb_defined.yres = screen_info.lfb_height;
0267     vesafb_fix.line_length = screen_info.lfb_linelength;
0268     vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
0269         FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
0270 
0271     /*   size_vmode -- that is the amount of memory needed for the
0272      *                 used video mode, i.e. the minimum amount of
0273      *                 memory we need. */
0274     size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
0275 
0276     /*   size_total -- all video memory we have. Used for mtrr
0277      *                 entries, resource allocation and bounds
0278      *                 checking. */
0279     size_total = screen_info.lfb_size * 65536;
0280     if (vram_total)
0281         size_total = vram_total * 1024 * 1024;
0282     if (size_total < size_vmode)
0283         size_total = size_vmode;
0284 
0285     /*   size_remap -- the amount of video memory we are going to
0286      *                 use for vesafb.  With modern cards it is no
0287      *                 option to simply use size_total as that
0288      *                 wastes plenty of kernel address space. */
0289     size_remap  = size_vmode * 2;
0290     if (vram_remap)
0291         size_remap = vram_remap * 1024 * 1024;
0292     if (size_remap < size_vmode)
0293         size_remap = size_vmode;
0294     if (size_remap > size_total)
0295         size_remap = size_total;
0296     vesafb_fix.smem_len = size_remap;
0297 
0298 #ifndef __i386__
0299     screen_info.vesapm_seg = 0;
0300 #endif
0301 
0302     if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
0303         printk(KERN_WARNING
0304                "vesafb: cannot reserve video memory at 0x%lx\n",
0305             vesafb_fix.smem_start);
0306         /* We cannot make this fatal. Sometimes this comes from magic
0307            spaces our resource handlers simply don't know about */
0308     }
0309 
0310     info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev);
0311     if (!info) {
0312         release_mem_region(vesafb_fix.smem_start, size_total);
0313         return -ENOMEM;
0314     }
0315     platform_set_drvdata(dev, info);
0316     par = info->par;
0317     info->pseudo_palette = par->pseudo_palette;
0318 
0319     /* set vesafb aperture size for generic probing */
0320     info->apertures = alloc_apertures(1);
0321     if (!info->apertures) {
0322         err = -ENOMEM;
0323         goto err;
0324     }
0325     info->apertures->ranges[0].base = screen_info.lfb_base;
0326     info->apertures->ranges[0].size = size_total;
0327 
0328     printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
0329            vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
0330 
0331     if (screen_info.vesapm_seg) {
0332         printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
0333                screen_info.vesapm_seg,screen_info.vesapm_off);
0334     }
0335 
0336     if (screen_info.vesapm_seg < 0xc000)
0337         ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
0338 
0339     if (ypan || pmi_setpal) {
0340         unsigned short *pmi_base;
0341         pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
0342         pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
0343         pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
0344         printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
0345         if (pmi_base[3]) {
0346             printk(KERN_INFO "vesafb: pmi: ports = ");
0347             for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
0348                 printk("%x ", pmi_base[i]);
0349             printk("\n");
0350             if (pmi_base[i] != 0xffff) {
0351                 /*
0352                  * memory areas not supported (yet?)
0353                  *
0354                  * Rules are: we have to set up a descriptor for the requested
0355                  * memory area and pass it in the ES register to the BIOS function.
0356                  */
0357                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
0358                 ypan = pmi_setpal = 0;
0359             }
0360         }
0361     }
0362 
0363     if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
0364         printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
0365                             "        colors may be incorrect\n");
0366         vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
0367     }
0368 
0369     vesafb_defined.xres_virtual = vesafb_defined.xres;
0370     vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
0371     if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
0372         printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
0373                (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
0374     } else {
0375         printk(KERN_INFO "vesafb: scrolling: redraw\n");
0376         vesafb_defined.yres_virtual = vesafb_defined.yres;
0377         ypan = 0;
0378     }
0379 
0380     /* some dummy values for timing to make fbset happy */
0381     vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
0382     vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
0383     vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
0384     
0385     vesafb_defined.red.offset    = screen_info.red_pos;
0386     vesafb_defined.red.length    = screen_info.red_size;
0387     vesafb_defined.green.offset  = screen_info.green_pos;
0388     vesafb_defined.green.length  = screen_info.green_size;
0389     vesafb_defined.blue.offset   = screen_info.blue_pos;
0390     vesafb_defined.blue.length   = screen_info.blue_size;
0391     vesafb_defined.transp.offset = screen_info.rsvd_pos;
0392     vesafb_defined.transp.length = screen_info.rsvd_size;
0393 
0394     if (vesafb_defined.bits_per_pixel <= 8) {
0395         depth = vesafb_defined.green.length;
0396         vesafb_defined.red.length =
0397         vesafb_defined.green.length =
0398         vesafb_defined.blue.length =
0399         vesafb_defined.bits_per_pixel;
0400     }
0401 
0402     printk(KERN_INFO "vesafb: %s: "
0403            "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
0404            (vesafb_defined.bits_per_pixel > 8) ?
0405            "Truecolor" : (vga_compat || pmi_setpal) ?
0406            "Pseudocolor" : "Static Pseudocolor",
0407            screen_info.rsvd_size,
0408            screen_info.red_size,
0409            screen_info.green_size,
0410            screen_info.blue_size,
0411            screen_info.rsvd_pos,
0412            screen_info.red_pos,
0413            screen_info.green_pos,
0414            screen_info.blue_pos);
0415 
0416     vesafb_fix.ypanstep  = ypan     ? 1 : 0;
0417     vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
0418 
0419     /* request failure does not faze us, as vgacon probably has this
0420      * region already (FIXME) */
0421     par->region = request_region(0x3c0, 32, "vesafb");
0422 
0423     if (mtrr == 3) {
0424         unsigned int temp_size = size_total;
0425 
0426         /* Find the largest power-of-two */
0427         temp_size = roundup_pow_of_two(temp_size);
0428 
0429         /* Try and find a power of two to add */
0430         do {
0431             par->wc_cookie =
0432                 arch_phys_wc_add(vesafb_fix.smem_start,
0433                          temp_size);
0434             temp_size >>= 1;
0435         } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0);
0436 
0437         info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
0438     } else {
0439         if (mtrr && mtrr != 3)
0440             WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n");
0441         info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
0442     }
0443 
0444     if (!info->screen_base) {
0445         printk(KERN_ERR
0446                "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
0447             vesafb_fix.smem_len, vesafb_fix.smem_start);
0448         err = -EIO;
0449         goto err_release_region;
0450     }
0451 
0452     printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
0453            "using %dk, total %dk\n",
0454            vesafb_fix.smem_start, info->screen_base,
0455            size_remap/1024, size_total/1024);
0456 
0457     if (!ypan)
0458         vesafb_ops.fb_pan_display = NULL;
0459 
0460     info->fbops = &vesafb_ops;
0461     info->var = vesafb_defined;
0462     info->fix = vesafb_fix;
0463     info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
0464         (ypan ? FBINFO_HWACCEL_YPAN : 0);
0465 
0466     if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
0467         err = -ENOMEM;
0468         goto err_release_region;
0469     }
0470     if (register_framebuffer(info)<0) {
0471         err = -EINVAL;
0472         fb_dealloc_cmap(&info->cmap);
0473         goto err_release_region;
0474     }
0475     fb_info(info, "%s frame buffer device\n", info->fix.id);
0476     return 0;
0477 err_release_region:
0478     arch_phys_wc_del(par->wc_cookie);
0479     if (info->screen_base)
0480         iounmap(info->screen_base);
0481     if (par->region)
0482         release_region(0x3c0, 32);
0483 err:
0484     framebuffer_release(info);
0485     release_mem_region(vesafb_fix.smem_start, size_total);
0486     return err;
0487 }
0488 
0489 static int vesafb_remove(struct platform_device *pdev)
0490 {
0491     struct fb_info *info = platform_get_drvdata(pdev);
0492 
0493     if (((struct vesafb_par *)(info->par))->region)
0494         release_region(0x3c0, 32);
0495 
0496     /* vesafb_destroy takes care of info cleanup */
0497     unregister_framebuffer(info);
0498 
0499     return 0;
0500 }
0501 
0502 static struct platform_driver vesafb_driver = {
0503     .driver = {
0504         .name = "vesa-framebuffer",
0505     },
0506     .probe = vesafb_probe,
0507     .remove = vesafb_remove,
0508 };
0509 
0510 module_platform_driver(vesafb_driver);
0511 MODULE_LICENSE("GPL");
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