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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 <[email protected]>
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/sysfb.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#endif
87 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#endif
130
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 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 */
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 sysfb_display_info *dpy;
247 struct screen_info *si;
248 struct fb_info *info;
249 struct vesafb_par *par;
250 int i, err;
251 unsigned int size_vmode;
252 unsigned int size_remap;
253 unsigned int size_total;
254 char *option = NULL;
255
256 /*
257 * If we fail probing the device, the kernel might try a different
258 * driver. We get a copy of the attached screen_info, so that we can
259 * modify its values without affecting later drivers.
260 */
261 dpy = dev_get_platdata(&dev->dev);
262 if (!dpy)
263 return -ENODEV;
264
265 si = devm_kmemdup(&dev->dev, &dpy->screen, sizeof(*si), GFP_KERNEL);
266 if (!si)
267 return -ENOMEM;
268
269 /* ignore error return of fb_get_options */
270 fb_get_options("vesafb", &option);
271 vesafb_setup(option);
272 kfree(option);
273
274 if (si->orig_video_isVGA != VIDEO_TYPE_VLFB)
275 return -ENODEV;
276
277 vga_compat = !__screen_info_vbe_mode_nonvga(si);
278 vesafb_fix.smem_start = si->lfb_base;
279 vesafb_defined.bits_per_pixel = si->lfb_depth;
280 if (15 == vesafb_defined.bits_per_pixel)
281 vesafb_defined.bits_per_pixel = 16;
282 vesafb_defined.xres = si->lfb_width;
283 vesafb_defined.yres = si->lfb_height;
284 vesafb_fix.line_length = si->lfb_linelength;
285 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ?
286 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
287
288 /* size_vmode -- that is the amount of memory needed for the
289 * used video mode, i.e. the minimum amount of
290 * memory we need. */
291 size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
292
293 /* size_total -- all video memory we have. Used for mtrr
294 * entries, resource allocation and bounds
295 * checking. */
296 size_total = si->lfb_size * 65536;
297 if (vram_total)
298 size_total = vram_total * 1024 * 1024;
299 if (size_total < size_vmode)
300 size_total = size_vmode;
301
302 /* size_remap -- the amount of video memory we are going to
303 * use for vesafb. With modern cards it is no
304 * option to simply use size_total as that
305 * wastes plenty of kernel address space. */
306 size_remap = size_vmode * 2;
307 if (vram_remap)
308 size_remap = vram_remap * 1024 * 1024;
309 if (size_remap < size_vmode)
310 size_remap = size_vmode;
311 if (size_remap > size_total)
312 size_remap = size_total;
313 vesafb_fix.smem_len = size_remap;
314
315#ifndef __i386__
316 si->vesapm_seg = 0;
317#endif
318
319 if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
320 dev_warn(&dev->dev,
321 "cannot reserve video memory at 0x%lx\n",
322 vesafb_fix.smem_start);
323 /* We cannot make this fatal. Sometimes this comes from magic
324 spaces our resource handlers simply don't know about */
325 }
326
327 info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev);
328 if (!info) {
329 release_mem_region(vesafb_fix.smem_start, size_total);
330 return -ENOMEM;
331 }
332 platform_set_drvdata(dev, info);
333 par = info->par;
334 info->pseudo_palette = par->pseudo_palette;
335
336 par->base = si->lfb_base;
337 par->size = size_total;
338
339 dev_info(&dev->dev, "mode is %dx%dx%d, linelength=%d, pages=%d\n",
340 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel,
341 vesafb_fix.line_length, si->pages);
342
343 if (si->vesapm_seg) {
344 dev_info(&dev->dev, "protected mode interface info at %04x:%04x\n",
345 si->vesapm_seg, si->vesapm_off);
346 }
347
348 if (si->vesapm_seg < 0xc000)
349 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
350
351 if (ypan || pmi_setpal) {
352 unsigned long pmi_phys;
353 unsigned short *pmi_base;
354 pmi_phys = ((unsigned long)si->vesapm_seg << 4) + si->vesapm_off;
355 pmi_base = (unsigned short *)phys_to_virt(pmi_phys);
356 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
357 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]);
358 dev_info(&dev->dev, "pmi: set display start = %p, set palette = %p\n",
359 pmi_start, pmi_pal);
360 if (pmi_base[3]) {
361 dev_info(&dev->dev, "pmi: ports = ");
362 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
363 printk("%x ", pmi_base[i]);
364 printk("\n");
365 if (pmi_base[i] != 0xffff) {
366 /*
367 * memory areas not supported (yet?)
368 *
369 * Rules are: we have to set up a descriptor for the requested
370 * memory area and pass it in the ES register to the BIOS function.
371 */
372 dev_info(&dev->dev, "can't handle memory requests, pmi disabled\n");
373 ypan = pmi_setpal = 0;
374 }
375 }
376 }
377
378 if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
379 dev_warn(&dev->dev, "hardware palette is unchangeable,\n"
380 " colors may be incorrect\n");
381 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
382 }
383
384 vesafb_defined.xres_virtual = vesafb_defined.xres;
385 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
386 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
387 dev_info(&dev->dev, "scrolling: %s using protected mode interface, yres_virtual=%d\n",
388 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
389 } else {
390 dev_info(&dev->dev, "scrolling: redraw\n");
391 vesafb_defined.yres_virtual = vesafb_defined.yres;
392 ypan = 0;
393 }
394
395 /* some dummy values for timing to make fbset happy */
396 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
397 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8;
398 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8;
399
400 vesafb_defined.red.offset = si->red_pos;
401 vesafb_defined.red.length = si->red_size;
402 vesafb_defined.green.offset = si->green_pos;
403 vesafb_defined.green.length = si->green_size;
404 vesafb_defined.blue.offset = si->blue_pos;
405 vesafb_defined.blue.length = si->blue_size;
406 vesafb_defined.transp.offset = si->rsvd_pos;
407 vesafb_defined.transp.length = si->rsvd_size;
408
409 if (vesafb_defined.bits_per_pixel <= 8) {
410 depth = vesafb_defined.green.length;
411 vesafb_defined.red.length =
412 vesafb_defined.green.length =
413 vesafb_defined.blue.length =
414 vesafb_defined.bits_per_pixel;
415 }
416
417 dev_info(&dev->dev, "%s: "
418 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
419 (vesafb_defined.bits_per_pixel > 8) ?
420 "Truecolor" : (vga_compat || pmi_setpal) ?
421 "Pseudocolor" : "Static Pseudocolor",
422 si->rsvd_size,
423 si->red_size,
424 si->green_size,
425 si->blue_size,
426 si->rsvd_pos,
427 si->red_pos,
428 si->green_pos,
429 si->blue_pos);
430
431 vesafb_fix.ypanstep = ypan ? 1 : 0;
432 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
433
434 /* request failure does not faze us, as vgacon probably has this
435 * region already (FIXME) */
436 par->region = request_region(0x3c0, 32, "vesafb");
437
438 if (mtrr == 3) {
439 unsigned int temp_size = size_total;
440
441 /* Find the largest power-of-two */
442 temp_size = roundup_pow_of_two(temp_size);
443
444 /* Try and find a power of two to add */
445 do {
446 par->wc_cookie =
447 arch_phys_wc_add(vesafb_fix.smem_start,
448 temp_size);
449 temp_size >>= 1;
450 } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0);
451
452 info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
453 } else {
454 if (mtrr && mtrr != 3)
455 WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n");
456 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
457 }
458
459 if (!info->screen_base) {
460 dev_err(&dev->dev,
461 "abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
462 vesafb_fix.smem_len, vesafb_fix.smem_start);
463 err = -EIO;
464 goto err_release_region;
465 }
466
467 dev_info(&dev->dev, "framebuffer at 0x%lx, mapped to 0x%p, "
468 "using %dk, total %dk\n",
469 vesafb_fix.smem_start, info->screen_base,
470 size_remap/1024, size_total/1024);
471
472 if (!ypan)
473 vesafb_ops.fb_pan_display = NULL;
474
475 info->fbops = &vesafb_ops;
476 info->var = vesafb_defined;
477 info->fix = vesafb_fix;
478 info->flags = (ypan ? FBINFO_HWACCEL_YPAN : 0);
479
480 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
481 err = -ENOMEM;
482 goto err_release_region;
483 }
484 err = devm_aperture_acquire_for_platform_device(dev, par->base, par->size);
485 if (err)
486 goto err_fb_dealloc_cmap;
487 if (register_framebuffer(info)<0) {
488 err = -EINVAL;
489 goto err_fb_dealloc_cmap;
490 }
491 fb_info(info, "%s frame buffer device\n", info->fix.id);
492 return 0;
493err_fb_dealloc_cmap:
494 fb_dealloc_cmap(&info->cmap);
495err_release_region:
496 arch_phys_wc_del(par->wc_cookie);
497 if (info->screen_base)
498 iounmap(info->screen_base);
499 if (par->region)
500 release_region(0x3c0, 32);
501 framebuffer_release(info);
502 release_mem_region(vesafb_fix.smem_start, size_total);
503 return err;
504}
505
506static void vesafb_remove(struct platform_device *pdev)
507{
508 struct fb_info *info = platform_get_drvdata(pdev);
509
510 if (((struct vesafb_par *)(info->par))->region)
511 release_region(0x3c0, 32);
512
513 /* vesafb_destroy takes care of info cleanup */
514 unregister_framebuffer(info);
515}
516
517static struct platform_driver vesafb_driver = {
518 .driver = {
519 .name = "vesa-framebuffer",
520 },
521 .probe = vesafb_probe,
522 .remove = vesafb_remove,
523};
524
525module_platform_driver(vesafb_driver);
526MODULE_LICENSE("GPL");