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 | |
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 | |
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(value: regno, dac_reg); |
101 | outb_p(value: red >> shift, dac_val); |
102 | outb_p(value: green >> shift, dac_val); |
103 | outb_p(value: 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 | |
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 | */ |
189 | static void vesafb_destroy(struct fb_info *info) |
190 | { |
191 | struct vesafb_par *par = info->par; |
192 | |
193 | fb_dealloc_cmap(cmap: &info->cmap); |
194 | arch_phys_wc_del(handle: par->wc_cookie); |
195 | if (info->screen_base) |
196 | iounmap(addr: 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 | |
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 | |
244 | static 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 different |
257 | * driver. We get a copy of the attached screen_info, so that we can |
258 | * modify its values without affecting later drivers. |
259 | */ |
260 | si = dev_get_platdata(dev: &dev->dev); |
261 | if (!si) |
262 | return -ENODEV; |
263 | si = devm_kmemdup(dev: &dev->dev, src: si, len: sizeof(*si), GFP_KERNEL); |
264 | if (!si) |
265 | return -ENOMEM; |
266 | |
267 | /* ignore error return of fb_get_options */ |
268 | fb_get_options(name: "vesafb" , option: &option); |
269 | vesafb_setup(options: option); |
270 | |
271 | if (si->orig_video_isVGA != VIDEO_TYPE_VLFB) |
272 | return -ENODEV; |
273 | |
274 | vga_compat = (si->capabilities & 2) ? 0 : 1; |
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 the |
286 | * used video mode, i.e. the minimum amount of |
287 | * memory we need. */ |
288 | size_vmode = vesafb_defined.yres * vesafb_fix.line_length; |
289 | |
290 | /* size_total -- all video memory we have. Used for mtrr |
291 | * entries, resource allocation and bounds |
292 | * 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 to |
300 | * use for vesafb. With modern cards it is no |
301 | * option to simply use size_total as that |
302 | * 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 | #endif |
315 | |
316 | if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb" )) { |
317 | printk(KERN_WARNING |
318 | "vesafb: cannot reserve video memory at 0x%lx\n" , |
319 | vesafb_fix.smem_start); |
320 | /* We cannot make this fatal. Sometimes this comes from magic |
321 | spaces our resource handlers simply don't know about */ |
322 | } |
323 | |
324 | info = framebuffer_alloc(size: sizeof(struct vesafb_par), dev: &dev->dev); |
325 | if (!info) { |
326 | release_mem_region(vesafb_fix.smem_start, size_total); |
327 | return -ENOMEM; |
328 | } |
329 | platform_set_drvdata(pdev: dev, data: 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(address: 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 requested |
366 | * 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 this |
431 | * 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(base: vesafb_fix.smem_start, |
444 | size: temp_size); |
445 | temp_size >>= 1; |
446 | } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0); |
447 | |
448 | info->screen_base = ioremap_wc(offset: vesafb_fix.smem_start, size: 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(offset: vesafb_fix.smem_start, size: vesafb_fix.smem_len); |
453 | } |
454 | |
455 | if (!info->screen_base) { |
456 | printk(KERN_ERR |
457 | "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(cmap: &info->cmap, len: 256, transp: 0) < 0) { |
477 | err = -ENOMEM; |
478 | goto err_release_region; |
479 | } |
480 | err = devm_aperture_acquire_for_platform_device(pdev: dev, base: par->base, size: par->size); |
481 | if (err) |
482 | goto err_fb_dealloc_cmap; |
483 | if (register_framebuffer(fb_info: 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; |
489 | err_fb_dealloc_cmap: |
490 | fb_dealloc_cmap(cmap: &info->cmap); |
491 | err_release_region: |
492 | arch_phys_wc_del(handle: par->wc_cookie); |
493 | if (info->screen_base) |
494 | iounmap(addr: 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 | |
502 | static 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(fb_info: info); |
511 | } |
512 | |
513 | static struct platform_driver vesafb_driver = { |
514 | .driver = { |
515 | .name = "vesa-framebuffer" , |
516 | }, |
517 | .probe = vesafb_probe, |
518 | .remove_new = vesafb_remove, |
519 | }; |
520 | |
521 | module_platform_driver(vesafb_driver); |
522 | MODULE_LICENSE("GPL" ); |
523 | |