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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * framebuffer driver for VBE 2.0 compliant graphic boards4 *5 * switching to graphics mode happens at boot time (while6 * running in real mode, see arch/i386/boot/video.S).7 *8 * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>9 *10 */11 12#include <linux/aperture.h>13#include <linux/module.h>14#include <linux/kernel.h>15#include <linux/errno.h>16#include <linux/string.h>17#include <linux/mm.h>18#include <linux/delay.h>19#include <linux/fb.h>20#include <linux/ioport.h>21#include <linux/init.h>22#include <linux/platform_device.h>23#include <linux/screen_info.h>24#include <linux/io.h>25 26#include <video/vga.h>27 28#define dac_reg (0x3c8)29#define dac_val (0x3c9)30 31/* --------------------------------------------------------------------- */32 33struct vesafb_par {34 u32 pseudo_palette[256];35 resource_size_t base;36 resource_size_t size;37 int wc_cookie;38 struct resource *region;39};40 41static struct fb_var_screeninfo vesafb_defined = {42 .activate = FB_ACTIVATE_NOW,43 .height = -1,44 .width = -1,45 .right_margin = 32,46 .upper_margin = 16,47 .lower_margin = 4,48 .vsync_len = 4,49 .vmode = FB_VMODE_NONINTERLACED,50};51 52static struct fb_fix_screeninfo vesafb_fix = {53 .id = "VESA VGA",54 .type = FB_TYPE_PACKED_PIXELS,55 .accel = FB_ACCEL_NONE,56};57 58static int inverse __read_mostly;59static int mtrr __read_mostly; /* disable mtrr */60static int vram_remap; /* Set amount of memory to be used */61static int vram_total; /* Set total amount of memory */62static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */63static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */64static void (*pmi_start)(void) __read_mostly;65static void (*pmi_pal) (void) __read_mostly;66static int depth __read_mostly;67static int vga_compat __read_mostly;68/* --------------------------------------------------------------------- */69 70static int vesafb_pan_display(struct fb_var_screeninfo *var,71 struct fb_info *info)72{73#ifdef __i386__74 int offset;75 76 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;77 78 __asm__ __volatile__(79 "call *(%%edi)"80 : /* no return value */81 : "a" (0x4f07), /* EAX */82 "b" (0), /* EBX */83 "c" (offset), /* ECX */84 "d" (offset >> 16), /* EDX */85 "D" (&pmi_start)); /* EDI */86#endif87 return 0;88}89 90static int vesa_setpalette(int regno, unsigned red, unsigned green,91 unsigned blue)92{93 int shift = 16 - depth;94 int err = -EINVAL;95 96/*97 * Try VGA registers first...98 */99 if (vga_compat) {100 outb_p(regno, dac_reg);101 outb_p(red >> shift, dac_val);102 outb_p(green >> shift, dac_val);103 outb_p(blue >> shift, dac_val);104 err = 0;105 }106 107#ifdef __i386__108/*109 * Fallback to the PMI....110 */111 if (err && pmi_setpal) {112 struct { u_char blue, green, red, pad; } entry;113 114 entry.red = red >> shift;115 entry.green = green >> shift;116 entry.blue = blue >> shift;117 entry.pad = 0;118 __asm__ __volatile__(119 "call *(%%esi)"120 : /* no return value */121 : "a" (0x4f09), /* EAX */122 "b" (0), /* EBX */123 "c" (1), /* ECX */124 "d" (regno), /* EDX */125 "D" (&entry), /* EDI */126 "S" (&pmi_pal)); /* ESI */127 err = 0;128 }129#endif130 131 return err;132}133 134static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,135 unsigned blue, unsigned transp,136 struct fb_info *info)137{138 int err = 0;139 140 /*141 * Set a single color register. The values supplied are142 * already rounded down to the hardware's capabilities143 * (according to the entries in the `var' structure). Return144 * != 0 for invalid regno.145 */146 147 if (regno >= info->cmap.len)148 return 1;149 150 if (info->var.bits_per_pixel == 8)151 err = vesa_setpalette(regno,red,green,blue);152 else if (regno < 16) {153 switch (info->var.bits_per_pixel) {154 case 16:155 if (info->var.red.offset == 10) {156 /* 1:5:5:5 */157 ((u32*) (info->pseudo_palette))[regno] =158 ((red & 0xf800) >> 1) |159 ((green & 0xf800) >> 6) |160 ((blue & 0xf800) >> 11);161 } else {162 /* 0:5:6:5 */163 ((u32*) (info->pseudo_palette))[regno] =164 ((red & 0xf800) ) |165 ((green & 0xfc00) >> 5) |166 ((blue & 0xf800) >> 11);167 }168 break;169 case 24:170 case 32:171 red >>= 8;172 green >>= 8;173 blue >>= 8;174 ((u32 *)(info->pseudo_palette))[regno] =175 (red << info->var.red.offset) |176 (green << info->var.green.offset) |177 (blue << info->var.blue.offset);178 break;179 }180 }181 182 return err;183}184 185/*186 * fb_ops.fb_destroy is called by the last put_fb_info() call at the end187 * of unregister_framebuffer() or fb_release(). Do any cleanup here.188 */189static void vesafb_destroy(struct fb_info *info)190{191 struct vesafb_par *par = info->par;192 193 fb_dealloc_cmap(&info->cmap);194 arch_phys_wc_del(par->wc_cookie);195 if (info->screen_base)196 iounmap(info->screen_base);197 release_mem_region(par->base, par->size);198 199 framebuffer_release(info);200}201 202static struct fb_ops vesafb_ops = {203 .owner = THIS_MODULE,204 FB_DEFAULT_IOMEM_OPS,205 .fb_destroy = vesafb_destroy,206 .fb_setcolreg = vesafb_setcolreg,207 .fb_pan_display = vesafb_pan_display,208};209 210static int vesafb_setup(char *options)211{212 char *this_opt;213 214 if (!options || !*options)215 return 0;216 217 while ((this_opt = strsep(&options, ",")) != NULL) {218 if (!*this_opt) continue;219 220 if (! strcmp(this_opt, "inverse"))221 inverse=1;222 else if (! strcmp(this_opt, "redraw"))223 ypan=0;224 else if (! strcmp(this_opt, "ypan"))225 ypan=1;226 else if (! strcmp(this_opt, "ywrap"))227 ypan=2;228 else if (! strcmp(this_opt, "vgapal"))229 pmi_setpal=0;230 else if (! strcmp(this_opt, "pmipal"))231 pmi_setpal=1;232 else if (! strncmp(this_opt, "mtrr:", 5))233 mtrr = simple_strtoul(this_opt+5, NULL, 0);234 else if (! strcmp(this_opt, "nomtrr"))235 mtrr=0;236 else if (! strncmp(this_opt, "vtotal:", 7))237 vram_total = simple_strtoul(this_opt+7, NULL, 0);238 else if (! strncmp(this_opt, "vremap:", 7))239 vram_remap = simple_strtoul(this_opt+7, NULL, 0);240 }241 return 0;242}243 244static int vesafb_probe(struct platform_device *dev)245{246 struct screen_info *si;247 struct fb_info *info;248 struct vesafb_par *par;249 int i, err;250 unsigned int size_vmode;251 unsigned int size_remap;252 unsigned int size_total;253 char *option = NULL;254 255 /*256 * If we fail probing the device, the kernel might try a different257 * driver. We get a copy of the attached screen_info, so that we can258 * modify its values without affecting later drivers.259 */260 si = dev_get_platdata(&dev->dev);261 if (!si)262 return -ENODEV;263 si = devm_kmemdup(&dev->dev, si, sizeof(*si), GFP_KERNEL);264 if (!si)265 return -ENOMEM;266 267 /* ignore error return of fb_get_options */268 fb_get_options("vesafb", &option);269 vesafb_setup(option);270 271 if (si->orig_video_isVGA != VIDEO_TYPE_VLFB)272 return -ENODEV;273 274 vga_compat = !__screen_info_vbe_mode_nonvga(si);275 vesafb_fix.smem_start = si->lfb_base;276 vesafb_defined.bits_per_pixel = si->lfb_depth;277 if (15 == vesafb_defined.bits_per_pixel)278 vesafb_defined.bits_per_pixel = 16;279 vesafb_defined.xres = si->lfb_width;280 vesafb_defined.yres = si->lfb_height;281 vesafb_fix.line_length = si->lfb_linelength;282 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ?283 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;284 285 /* size_vmode -- that is the amount of memory needed for the286 * used video mode, i.e. the minimum amount of287 * memory we need. */288 size_vmode = vesafb_defined.yres * vesafb_fix.line_length;289 290 /* size_total -- all video memory we have. Used for mtrr291 * entries, resource allocation and bounds292 * checking. */293 size_total = si->lfb_size * 65536;294 if (vram_total)295 size_total = vram_total * 1024 * 1024;296 if (size_total < size_vmode)297 size_total = size_vmode;298 299 /* size_remap -- the amount of video memory we are going to300 * use for vesafb. With modern cards it is no301 * option to simply use size_total as that302 * wastes plenty of kernel address space. */303 size_remap = size_vmode * 2;304 if (vram_remap)305 size_remap = vram_remap * 1024 * 1024;306 if (size_remap < size_vmode)307 size_remap = size_vmode;308 if (size_remap > size_total)309 size_remap = size_total;310 vesafb_fix.smem_len = size_remap;311 312#ifndef __i386__313 si->vesapm_seg = 0;314#endif315 316 if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {317 printk(KERN_WARNING318 "vesafb: cannot reserve video memory at 0x%lx\n",319 vesafb_fix.smem_start);320 /* We cannot make this fatal. Sometimes this comes from magic321 spaces our resource handlers simply don't know about */322 }323 324 info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev);325 if (!info) {326 release_mem_region(vesafb_fix.smem_start, size_total);327 return -ENOMEM;328 }329 platform_set_drvdata(dev, info);330 par = info->par;331 info->pseudo_palette = par->pseudo_palette;332 333 par->base = si->lfb_base;334 par->size = size_total;335 336 printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",337 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel,338 vesafb_fix.line_length, si->pages);339 340 if (si->vesapm_seg) {341 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",342 si->vesapm_seg, si->vesapm_off);343 }344 345 if (si->vesapm_seg < 0xc000)346 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */347 348 if (ypan || pmi_setpal) {349 unsigned long pmi_phys;350 unsigned short *pmi_base;351 pmi_phys = ((unsigned long)si->vesapm_seg << 4) + si->vesapm_off;352 pmi_base = (unsigned short *)phys_to_virt(pmi_phys);353 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);354 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]);355 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);356 if (pmi_base[3]) {357 printk(KERN_INFO "vesafb: pmi: ports = ");358 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)359 printk("%x ", pmi_base[i]);360 printk("\n");361 if (pmi_base[i] != 0xffff) {362 /*363 * memory areas not supported (yet?)364 *365 * Rules are: we have to set up a descriptor for the requested366 * memory area and pass it in the ES register to the BIOS function.367 */368 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");369 ypan = pmi_setpal = 0;370 }371 }372 }373 374 if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {375 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"376 " colors may be incorrect\n");377 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;378 }379 380 vesafb_defined.xres_virtual = vesafb_defined.xres;381 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;382 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {383 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",384 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);385 } else {386 printk(KERN_INFO "vesafb: scrolling: redraw\n");387 vesafb_defined.yres_virtual = vesafb_defined.yres;388 ypan = 0;389 }390 391 /* some dummy values for timing to make fbset happy */392 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;393 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8;394 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8;395 396 vesafb_defined.red.offset = si->red_pos;397 vesafb_defined.red.length = si->red_size;398 vesafb_defined.green.offset = si->green_pos;399 vesafb_defined.green.length = si->green_size;400 vesafb_defined.blue.offset = si->blue_pos;401 vesafb_defined.blue.length = si->blue_size;402 vesafb_defined.transp.offset = si->rsvd_pos;403 vesafb_defined.transp.length = si->rsvd_size;404 405 if (vesafb_defined.bits_per_pixel <= 8) {406 depth = vesafb_defined.green.length;407 vesafb_defined.red.length =408 vesafb_defined.green.length =409 vesafb_defined.blue.length =410 vesafb_defined.bits_per_pixel;411 }412 413 printk(KERN_INFO "vesafb: %s: "414 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",415 (vesafb_defined.bits_per_pixel > 8) ?416 "Truecolor" : (vga_compat || pmi_setpal) ?417 "Pseudocolor" : "Static Pseudocolor",418 si->rsvd_size,419 si->red_size,420 si->green_size,421 si->blue_size,422 si->rsvd_pos,423 si->red_pos,424 si->green_pos,425 si->blue_pos);426 427 vesafb_fix.ypanstep = ypan ? 1 : 0;428 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;429 430 /* request failure does not faze us, as vgacon probably has this431 * region already (FIXME) */432 par->region = request_region(0x3c0, 32, "vesafb");433 434 if (mtrr == 3) {435 unsigned int temp_size = size_total;436 437 /* Find the largest power-of-two */438 temp_size = roundup_pow_of_two(temp_size);439 440 /* Try and find a power of two to add */441 do {442 par->wc_cookie =443 arch_phys_wc_add(vesafb_fix.smem_start,444 temp_size);445 temp_size >>= 1;446 } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0);447 448 info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);449 } else {450 if (mtrr && mtrr != 3)451 WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n");452 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);453 }454 455 if (!info->screen_base) {456 printk(KERN_ERR457 "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",458 vesafb_fix.smem_len, vesafb_fix.smem_start);459 err = -EIO;460 goto err_release_region;461 }462 463 printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "464 "using %dk, total %dk\n",465 vesafb_fix.smem_start, info->screen_base,466 size_remap/1024, size_total/1024);467 468 if (!ypan)469 vesafb_ops.fb_pan_display = NULL;470 471 info->fbops = &vesafb_ops;472 info->var = vesafb_defined;473 info->fix = vesafb_fix;474 info->flags = (ypan ? FBINFO_HWACCEL_YPAN : 0);475 476 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {477 err = -ENOMEM;478 goto err_release_region;479 }480 err = devm_aperture_acquire_for_platform_device(dev, par->base, par->size);481 if (err)482 goto err_fb_dealloc_cmap;483 if (register_framebuffer(info)<0) {484 err = -EINVAL;485 goto err_fb_dealloc_cmap;486 }487 fb_info(info, "%s frame buffer device\n", info->fix.id);488 return 0;489err_fb_dealloc_cmap:490 fb_dealloc_cmap(&info->cmap);491err_release_region:492 arch_phys_wc_del(par->wc_cookie);493 if (info->screen_base)494 iounmap(info->screen_base);495 if (par->region)496 release_region(0x3c0, 32);497 framebuffer_release(info);498 release_mem_region(vesafb_fix.smem_start, size_total);499 return err;500}501 502static void vesafb_remove(struct platform_device *pdev)503{504 struct fb_info *info = platform_get_drvdata(pdev);505 506 if (((struct vesafb_par *)(info->par))->region)507 release_region(0x3c0, 32);508 509 /* vesafb_destroy takes care of info cleanup */510 unregister_framebuffer(info);511}512 513static struct platform_driver vesafb_driver = {514 .driver = {515 .name = "vesa-framebuffer",516 },517 .probe = vesafb_probe,518 .remove = vesafb_remove,519};520 521module_platform_driver(vesafb_driver);522MODULE_LICENSE("GPL");523