1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * framebuffer driver for VBE 2.0 compliant graphic boards
4 *
5 * switching to graphics mode happens at boot time (while
6 * 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
33 struct 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
41 static 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
52 static struct fb_fix_screeninfo vesafb_fix = {
53 .id = "VESA VGA",
54 .type = FB_TYPE_PACKED_PIXELS,
55 .accel = FB_ACCEL_NONE,
56 };
57
58 static int inverse __read_mostly;
59 static int mtrr __read_mostly; /* disable mtrr */
60 static int vram_remap; /* Set amount of memory to be used */
61 static int vram_total; /* Set total amount of memory */
62 static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */
63 static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */
64 static void (*pmi_start)(void) __read_mostly;
65 static void (*pmi_pal) (void) __read_mostly;
66 static int depth __read_mostly;
67 static int vga_compat __read_mostly;
68 /* --------------------------------------------------------------------- */
69
vesafb_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)70 static 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 #endif
87 return 0;
88 }
89
vesa_setpalette(int regno,unsigned red,unsigned green,unsigned blue)90 static 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 #endif
130
131 return err;
132 }
133
vesafb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)134 static 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 are
142 * already rounded down to the hardware's capabilities
143 * (according to the entries in the `var' structure). Return
144 * != 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 end
187 * of unregister_framebuffer() or fb_release(). Do any cleanup here.
188 */
vesafb_destroy(struct fb_info * info)189 static 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
202 static 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
vesafb_setup(char * options)210 static 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
vesafb_probe(struct platform_device * dev)244 static int vesafb_probe(struct platform_device *dev)
245 {
246 struct fb_info *info;
247 struct vesafb_par *par;
248 int i, err;
249 unsigned int size_vmode;
250 unsigned int size_remap;
251 unsigned int size_total;
252 char *option = NULL;
253
254 /* ignore error return of fb_get_options */
255 fb_get_options("vesafb", &option);
256 vesafb_setup(option);
257
258 if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
259 return -ENODEV;
260
261 vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
262 vesafb_fix.smem_start = screen_info.lfb_base;
263 vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
264 if (15 == vesafb_defined.bits_per_pixel)
265 vesafb_defined.bits_per_pixel = 16;
266 vesafb_defined.xres = screen_info.lfb_width;
267 vesafb_defined.yres = screen_info.lfb_height;
268 vesafb_fix.line_length = screen_info.lfb_linelength;
269 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ?
270 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
271
272 /* size_vmode -- that is the amount of memory needed for the
273 * used video mode, i.e. the minimum amount of
274 * memory we need. */
275 size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
276
277 /* size_total -- all video memory we have. Used for mtrr
278 * entries, resource allocation and bounds
279 * checking. */
280 size_total = screen_info.lfb_size * 65536;
281 if (vram_total)
282 size_total = vram_total * 1024 * 1024;
283 if (size_total < size_vmode)
284 size_total = size_vmode;
285
286 /* size_remap -- the amount of video memory we are going to
287 * use for vesafb. With modern cards it is no
288 * option to simply use size_total as that
289 * wastes plenty of kernel address space. */
290 size_remap = size_vmode * 2;
291 if (vram_remap)
292 size_remap = vram_remap * 1024 * 1024;
293 if (size_remap < size_vmode)
294 size_remap = size_vmode;
295 if (size_remap > size_total)
296 size_remap = size_total;
297 vesafb_fix.smem_len = size_remap;
298
299 #ifndef __i386__
300 screen_info.vesapm_seg = 0;
301 #endif
302
303 if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
304 printk(KERN_WARNING
305 "vesafb: cannot reserve video memory at 0x%lx\n",
306 vesafb_fix.smem_start);
307 /* We cannot make this fatal. Sometimes this comes from magic
308 spaces our resource handlers simply don't know about */
309 }
310
311 info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev);
312 if (!info) {
313 release_mem_region(vesafb_fix.smem_start, size_total);
314 return -ENOMEM;
315 }
316 platform_set_drvdata(dev, info);
317 par = info->par;
318 info->pseudo_palette = par->pseudo_palette;
319
320 par->base = screen_info.lfb_base;
321 par->size = size_total;
322
323 printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
324 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
325
326 if (screen_info.vesapm_seg) {
327 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
328 screen_info.vesapm_seg,screen_info.vesapm_off);
329 }
330
331 if (screen_info.vesapm_seg < 0xc000)
332 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
333
334 if (ypan || pmi_setpal) {
335 unsigned short *pmi_base;
336 pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
337 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
338 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]);
339 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
340 if (pmi_base[3]) {
341 printk(KERN_INFO "vesafb: pmi: ports = ");
342 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
343 printk("%x ", pmi_base[i]);
344 printk("\n");
345 if (pmi_base[i] != 0xffff) {
346 /*
347 * memory areas not supported (yet?)
348 *
349 * Rules are: we have to set up a descriptor for the requested
350 * memory area and pass it in the ES register to the BIOS function.
351 */
352 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
353 ypan = pmi_setpal = 0;
354 }
355 }
356 }
357
358 if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
359 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
360 " colors may be incorrect\n");
361 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
362 }
363
364 vesafb_defined.xres_virtual = vesafb_defined.xres;
365 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
366 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
367 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
368 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
369 } else {
370 printk(KERN_INFO "vesafb: scrolling: redraw\n");
371 vesafb_defined.yres_virtual = vesafb_defined.yres;
372 ypan = 0;
373 }
374
375 /* some dummy values for timing to make fbset happy */
376 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
377 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8;
378 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8;
379
380 vesafb_defined.red.offset = screen_info.red_pos;
381 vesafb_defined.red.length = screen_info.red_size;
382 vesafb_defined.green.offset = screen_info.green_pos;
383 vesafb_defined.green.length = screen_info.green_size;
384 vesafb_defined.blue.offset = screen_info.blue_pos;
385 vesafb_defined.blue.length = screen_info.blue_size;
386 vesafb_defined.transp.offset = screen_info.rsvd_pos;
387 vesafb_defined.transp.length = screen_info.rsvd_size;
388
389 if (vesafb_defined.bits_per_pixel <= 8) {
390 depth = vesafb_defined.green.length;
391 vesafb_defined.red.length =
392 vesafb_defined.green.length =
393 vesafb_defined.blue.length =
394 vesafb_defined.bits_per_pixel;
395 }
396
397 printk(KERN_INFO "vesafb: %s: "
398 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
399 (vesafb_defined.bits_per_pixel > 8) ?
400 "Truecolor" : (vga_compat || pmi_setpal) ?
401 "Pseudocolor" : "Static Pseudocolor",
402 screen_info.rsvd_size,
403 screen_info.red_size,
404 screen_info.green_size,
405 screen_info.blue_size,
406 screen_info.rsvd_pos,
407 screen_info.red_pos,
408 screen_info.green_pos,
409 screen_info.blue_pos);
410
411 vesafb_fix.ypanstep = ypan ? 1 : 0;
412 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
413
414 /* request failure does not faze us, as vgacon probably has this
415 * region already (FIXME) */
416 par->region = request_region(0x3c0, 32, "vesafb");
417
418 if (mtrr == 3) {
419 unsigned int temp_size = size_total;
420
421 /* Find the largest power-of-two */
422 temp_size = roundup_pow_of_two(temp_size);
423
424 /* Try and find a power of two to add */
425 do {
426 par->wc_cookie =
427 arch_phys_wc_add(vesafb_fix.smem_start,
428 temp_size);
429 temp_size >>= 1;
430 } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0);
431
432 info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
433 } else {
434 if (mtrr && mtrr != 3)
435 WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n");
436 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
437 }
438
439 if (!info->screen_base) {
440 printk(KERN_ERR
441 "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
442 vesafb_fix.smem_len, vesafb_fix.smem_start);
443 err = -EIO;
444 goto err_release_region;
445 }
446
447 printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
448 "using %dk, total %dk\n",
449 vesafb_fix.smem_start, info->screen_base,
450 size_remap/1024, size_total/1024);
451
452 if (!ypan)
453 vesafb_ops.fb_pan_display = NULL;
454
455 info->fbops = &vesafb_ops;
456 info->var = vesafb_defined;
457 info->fix = vesafb_fix;
458 info->flags = (ypan ? FBINFO_HWACCEL_YPAN : 0);
459
460 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
461 err = -ENOMEM;
462 goto err_release_region;
463 }
464 err = devm_aperture_acquire_for_platform_device(dev, par->base, par->size);
465 if (err)
466 goto err_fb_dealloc_cmap;
467 if (register_framebuffer(info)<0) {
468 err = -EINVAL;
469 goto err_fb_dealloc_cmap;
470 }
471 fb_info(info, "%s frame buffer device\n", info->fix.id);
472 return 0;
473 err_fb_dealloc_cmap:
474 fb_dealloc_cmap(&info->cmap);
475 err_release_region:
476 arch_phys_wc_del(par->wc_cookie);
477 if (info->screen_base)
478 iounmap(info->screen_base);
479 if (par->region)
480 release_region(0x3c0, 32);
481 framebuffer_release(info);
482 release_mem_region(vesafb_fix.smem_start, size_total);
483 return err;
484 }
485
vesafb_remove(struct platform_device * pdev)486 static void vesafb_remove(struct platform_device *pdev)
487 {
488 struct fb_info *info = platform_get_drvdata(pdev);
489
490 if (((struct vesafb_par *)(info->par))->region)
491 release_region(0x3c0, 32);
492
493 /* vesafb_destroy takes care of info cleanup */
494 unregister_framebuffer(info);
495 }
496
497 static struct platform_driver vesafb_driver = {
498 .driver = {
499 .name = "vesa-framebuffer",
500 },
501 .probe = vesafb_probe,
502 .remove_new = vesafb_remove,
503 };
504
505 module_platform_driver(vesafb_driver);
506 MODULE_LICENSE("GPL");
507
