blob: 93fe08d6c78f6f2a36b84c8977ad95c2781ff6f1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/video/vfb.c -- Virtual frame buffer device
3 *
4 * Copyright (C) 2002 James Simmons
5 *
6 * Copyright (C) 1997 Geert Uytterhoeven
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive for
10 * more details.
11 */
12
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/slab.h>
19#include <linux/vmalloc.h>
20#include <linux/delay.h>
21#include <linux/interrupt.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010022#include <linux/platform_device.h>
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/fb.h>
25#include <linux/init.h>
26
27 /*
28 * RAM we reserve for the frame buffer. This defines the maximum screen
29 * size
30 *
31 * The default can be overridden if the driver is compiled as a module
32 */
33
34#define VIDEOMEMSIZE (1*1024*1024) /* 1 MB */
35
36static void *videomemory;
37static u_long videomemorysize = VIDEOMEMSIZE;
38module_param(videomemorysize, ulong, 0);
39
Ilya Yanok68e5e9d2007-10-16 01:29:17 -070040/**********************************************************************
41 *
42 * Memory management
43 *
44 **********************************************************************/
45static void *rvmalloc(unsigned long size)
46{
47 void *mem;
48 unsigned long adr;
49
50 size = PAGE_ALIGN(size);
51 mem = vmalloc_32(size);
52 if (!mem)
53 return NULL;
54
55 memset(mem, 0, size); /* Clear the ram out, no junk to the user */
56 adr = (unsigned long) mem;
57 while (size > 0) {
58 SetPageReserved(vmalloc_to_page((void *)adr));
59 adr += PAGE_SIZE;
60 size -= PAGE_SIZE;
61 }
62
63 return mem;
64}
65
66static void rvfree(void *mem, unsigned long size)
67{
68 unsigned long adr;
69
70 if (!mem)
71 return;
72
73 adr = (unsigned long) mem;
74 while ((long) size > 0) {
75 ClearPageReserved(vmalloc_to_page((void *)adr));
76 adr += PAGE_SIZE;
77 size -= PAGE_SIZE;
78 }
79 vfree(mem);
80}
81
Linus Torvalds1da177e2005-04-16 15:20:36 -070082static struct fb_var_screeninfo vfb_default __initdata = {
83 .xres = 640,
84 .yres = 480,
85 .xres_virtual = 640,
86 .yres_virtual = 480,
87 .bits_per_pixel = 8,
88 .red = { 0, 8, 0 },
89 .green = { 0, 8, 0 },
90 .blue = { 0, 8, 0 },
91 .activate = FB_ACTIVATE_TEST,
92 .height = -1,
93 .width = -1,
94 .pixclock = 20000,
95 .left_margin = 64,
96 .right_margin = 64,
97 .upper_margin = 32,
98 .lower_margin = 32,
99 .hsync_len = 64,
100 .vsync_len = 2,
101 .vmode = FB_VMODE_NONINTERLACED,
102};
103
104static struct fb_fix_screeninfo vfb_fix __initdata = {
105 .id = "Virtual FB",
106 .type = FB_TYPE_PACKED_PIXELS,
107 .visual = FB_VISUAL_PSEUDOCOLOR,
108 .xpanstep = 1,
109 .ypanstep = 1,
110 .ywrapstep = 1,
111 .accel = FB_ACCEL_NONE,
112};
113
114static int vfb_enable __initdata = 0; /* disabled by default */
115module_param(vfb_enable, bool, 0);
116
117static int vfb_check_var(struct fb_var_screeninfo *var,
118 struct fb_info *info);
119static int vfb_set_par(struct fb_info *info);
120static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
121 u_int transp, struct fb_info *info);
122static int vfb_pan_display(struct fb_var_screeninfo *var,
123 struct fb_info *info);
Christoph Hellwig216d5262006-01-14 13:21:25 -0800124static int vfb_mmap(struct fb_info *info,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 struct vm_area_struct *vma);
126
127static struct fb_ops vfb_ops = {
Antonino A. Daplas52102c02007-05-08 00:39:07 -0700128 .fb_read = fb_sys_read,
129 .fb_write = fb_sys_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 .fb_check_var = vfb_check_var,
131 .fb_set_par = vfb_set_par,
132 .fb_setcolreg = vfb_setcolreg,
133 .fb_pan_display = vfb_pan_display,
Antonino A. Daplas87b48842007-05-08 00:39:01 -0700134 .fb_fillrect = sys_fillrect,
135 .fb_copyarea = sys_copyarea,
136 .fb_imageblit = sys_imageblit,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 .fb_mmap = vfb_mmap,
138};
139
140 /*
141 * Internal routines
142 */
143
144static u_long get_line_length(int xres_virtual, int bpp)
145{
146 u_long length;
147
148 length = xres_virtual * bpp;
149 length = (length + 31) & ~31;
150 length >>= 3;
151 return (length);
152}
153
154 /*
155 * Setting the video mode has been split into two parts.
156 * First part, xxxfb_check_var, must not write anything
157 * to hardware, it should only verify and adjust var.
158 * This means it doesn't alter par but it does use hardware
159 * data from it to check this var.
160 */
161
162static int vfb_check_var(struct fb_var_screeninfo *var,
163 struct fb_info *info)
164{
165 u_long line_length;
166
167 /*
168 * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
169 * as FB_VMODE_SMOOTH_XPAN is only used internally
170 */
171
172 if (var->vmode & FB_VMODE_CONUPDATE) {
173 var->vmode |= FB_VMODE_YWRAP;
174 var->xoffset = info->var.xoffset;
175 var->yoffset = info->var.yoffset;
176 }
177
178 /*
179 * Some very basic checks
180 */
181 if (!var->xres)
182 var->xres = 1;
183 if (!var->yres)
184 var->yres = 1;
185 if (var->xres > var->xres_virtual)
186 var->xres_virtual = var->xres;
187 if (var->yres > var->yres_virtual)
188 var->yres_virtual = var->yres;
189 if (var->bits_per_pixel <= 1)
190 var->bits_per_pixel = 1;
191 else if (var->bits_per_pixel <= 8)
192 var->bits_per_pixel = 8;
193 else if (var->bits_per_pixel <= 16)
194 var->bits_per_pixel = 16;
195 else if (var->bits_per_pixel <= 24)
196 var->bits_per_pixel = 24;
197 else if (var->bits_per_pixel <= 32)
198 var->bits_per_pixel = 32;
199 else
200 return -EINVAL;
201
202 if (var->xres_virtual < var->xoffset + var->xres)
203 var->xres_virtual = var->xoffset + var->xres;
204 if (var->yres_virtual < var->yoffset + var->yres)
205 var->yres_virtual = var->yoffset + var->yres;
206
207 /*
208 * Memory limit
209 */
210 line_length =
211 get_line_length(var->xres_virtual, var->bits_per_pixel);
212 if (line_length * var->yres_virtual > videomemorysize)
213 return -ENOMEM;
214
215 /*
216 * Now that we checked it we alter var. The reason being is that the video
217 * mode passed in might not work but slight changes to it might make it
218 * work. This way we let the user know what is acceptable.
219 */
220 switch (var->bits_per_pixel) {
221 case 1:
222 case 8:
223 var->red.offset = 0;
224 var->red.length = 8;
225 var->green.offset = 0;
226 var->green.length = 8;
227 var->blue.offset = 0;
228 var->blue.length = 8;
229 var->transp.offset = 0;
230 var->transp.length = 0;
231 break;
232 case 16: /* RGBA 5551 */
233 if (var->transp.length) {
234 var->red.offset = 0;
235 var->red.length = 5;
236 var->green.offset = 5;
237 var->green.length = 5;
238 var->blue.offset = 10;
239 var->blue.length = 5;
240 var->transp.offset = 15;
241 var->transp.length = 1;
242 } else { /* RGB 565 */
243 var->red.offset = 0;
244 var->red.length = 5;
245 var->green.offset = 5;
246 var->green.length = 6;
247 var->blue.offset = 11;
248 var->blue.length = 5;
249 var->transp.offset = 0;
250 var->transp.length = 0;
251 }
252 break;
253 case 24: /* RGB 888 */
254 var->red.offset = 0;
255 var->red.length = 8;
256 var->green.offset = 8;
257 var->green.length = 8;
258 var->blue.offset = 16;
259 var->blue.length = 8;
260 var->transp.offset = 0;
261 var->transp.length = 0;
262 break;
263 case 32: /* RGBA 8888 */
264 var->red.offset = 0;
265 var->red.length = 8;
266 var->green.offset = 8;
267 var->green.length = 8;
268 var->blue.offset = 16;
269 var->blue.length = 8;
270 var->transp.offset = 24;
271 var->transp.length = 8;
272 break;
273 }
274 var->red.msb_right = 0;
275 var->green.msb_right = 0;
276 var->blue.msb_right = 0;
277 var->transp.msb_right = 0;
278
279 return 0;
280}
281
282/* This routine actually sets the video mode. It's in here where we
283 * the hardware state info->par and fix which can be affected by the
284 * change in par. For this driver it doesn't do much.
285 */
286static int vfb_set_par(struct fb_info *info)
287{
288 info->fix.line_length = get_line_length(info->var.xres_virtual,
289 info->var.bits_per_pixel);
290 return 0;
291}
292
293 /*
294 * Set a single color register. The values supplied are already
295 * rounded down to the hardware's capabilities (according to the
296 * entries in the var structure). Return != 0 for invalid regno.
297 */
298
299static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
300 u_int transp, struct fb_info *info)
301{
302 if (regno >= 256) /* no. of hw registers */
303 return 1;
304 /*
305 * Program hardware... do anything you want with transp
306 */
307
308 /* grayscale works only partially under directcolor */
309 if (info->var.grayscale) {
310 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
311 red = green = blue =
312 (red * 77 + green * 151 + blue * 28) >> 8;
313 }
314
315 /* Directcolor:
316 * var->{color}.offset contains start of bitfield
317 * var->{color}.length contains length of bitfield
318 * {hardwarespecific} contains width of RAMDAC
319 * cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset)
320 * RAMDAC[X] is programmed to (red, green, blue)
321 *
322 * Pseudocolor:
323 * uses offset = 0 && length = RAMDAC register width.
324 * var->{color}.offset is 0
325 * var->{color}.length contains widht of DAC
326 * cmap is not used
327 * RAMDAC[X] is programmed to (red, green, blue)
328 * Truecolor:
329 * does not use DAC. Usually 3 are present.
330 * var->{color}.offset contains start of bitfield
331 * var->{color}.length contains length of bitfield
332 * cmap is programmed to (red << red.offset) | (green << green.offset) |
333 * (blue << blue.offset) | (transp << transp.offset)
334 * RAMDAC does not exist
335 */
336#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
337 switch (info->fix.visual) {
338 case FB_VISUAL_TRUECOLOR:
339 case FB_VISUAL_PSEUDOCOLOR:
340 red = CNVT_TOHW(red, info->var.red.length);
341 green = CNVT_TOHW(green, info->var.green.length);
342 blue = CNVT_TOHW(blue, info->var.blue.length);
343 transp = CNVT_TOHW(transp, info->var.transp.length);
344 break;
345 case FB_VISUAL_DIRECTCOLOR:
346 red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */
347 green = CNVT_TOHW(green, 8);
348 blue = CNVT_TOHW(blue, 8);
349 /* hey, there is bug in transp handling... */
350 transp = CNVT_TOHW(transp, 8);
351 break;
352 }
353#undef CNVT_TOHW
354 /* Truecolor has hardware independent palette */
355 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
356 u32 v;
357
358 if (regno >= 16)
359 return 1;
360
361 v = (red << info->var.red.offset) |
362 (green << info->var.green.offset) |
363 (blue << info->var.blue.offset) |
364 (transp << info->var.transp.offset);
365 switch (info->var.bits_per_pixel) {
366 case 8:
367 break;
368 case 16:
369 ((u32 *) (info->pseudo_palette))[regno] = v;
370 break;
371 case 24:
372 case 32:
373 ((u32 *) (info->pseudo_palette))[regno] = v;
374 break;
375 }
376 return 0;
377 }
378 return 0;
379}
380
381 /*
382 * Pan or Wrap the Display
383 *
384 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
385 */
386
387static int vfb_pan_display(struct fb_var_screeninfo *var,
388 struct fb_info *info)
389{
390 if (var->vmode & FB_VMODE_YWRAP) {
391 if (var->yoffset < 0
392 || var->yoffset >= info->var.yres_virtual
393 || var->xoffset)
394 return -EINVAL;
395 } else {
396 if (var->xoffset + var->xres > info->var.xres_virtual ||
397 var->yoffset + var->yres > info->var.yres_virtual)
398 return -EINVAL;
399 }
400 info->var.xoffset = var->xoffset;
401 info->var.yoffset = var->yoffset;
402 if (var->vmode & FB_VMODE_YWRAP)
403 info->var.vmode |= FB_VMODE_YWRAP;
404 else
405 info->var.vmode &= ~FB_VMODE_YWRAP;
406 return 0;
407}
408
409 /*
410 * Most drivers don't need their own mmap function
411 */
412
Christoph Hellwig216d5262006-01-14 13:21:25 -0800413static int vfb_mmap(struct fb_info *info,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 struct vm_area_struct *vma)
415{
Ilya Yanok68e5e9d2007-10-16 01:29:17 -0700416 unsigned long start = vma->vm_start;
417 unsigned long size = vma->vm_end - vma->vm_start;
418 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
419 unsigned long page, pos;
420
421 if (offset + size > info->fix.smem_len) {
422 return -EINVAL;
423 }
424
425 pos = (unsigned long)info->fix.smem_start + offset;
426
427 while (size > 0) {
428 page = vmalloc_to_pfn((void *)pos);
429 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) {
430 return -EAGAIN;
431 }
432 start += PAGE_SIZE;
433 pos += PAGE_SIZE;
434 if (size > PAGE_SIZE)
435 size -= PAGE_SIZE;
436 else
437 size = 0;
438 }
439
440 vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
441 return 0;
442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443}
444
445#ifndef MODULE
Frans Popb6048382008-07-23 21:31:26 -0700446/*
447 * The virtual framebuffer driver is only enabled if explicitly
448 * requested by passing 'video=vfb:' (or any actual options).
449 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450static int __init vfb_setup(char *options)
451{
452 char *this_opt;
453
Frans Popb6048382008-07-23 21:31:26 -0700454 vfb_enable = 0;
455
456 if (!options)
457 return 1;
458
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 vfb_enable = 1;
460
Frans Popb6048382008-07-23 21:31:26 -0700461 if (!*options)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 return 1;
463
464 while ((this_opt = strsep(&options, ",")) != NULL) {
465 if (!*this_opt)
466 continue;
Frans Popb6048382008-07-23 21:31:26 -0700467 /* Test disable for backwards compatibility */
468 if (!strcmp(this_opt, "disable"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 vfb_enable = 0;
470 }
471 return 1;
472}
473#endif /* MODULE */
474
475 /*
476 * Initialisation
477 */
478
Russell King3ae5eae2005-11-09 22:32:44 +0000479static int __init vfb_probe(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 struct fb_info *info;
482 int retval = -ENOMEM;
483
484 /*
485 * For real video cards we use ioremap.
486 */
Ilya Yanok68e5e9d2007-10-16 01:29:17 -0700487 if (!(videomemory = rvmalloc(videomemorysize)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 return retval;
489
490 /*
491 * VFB must clear memory to prevent kernel info
492 * leakage into userspace
493 * VGA-based drivers MUST NOT clear memory if
494 * they want to be able to take over vgacon
495 */
496 memset(videomemory, 0, videomemorysize);
497
498 info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
499 if (!info)
500 goto err;
501
502 info->screen_base = (char __iomem *)videomemory;
503 info->fbops = &vfb_ops;
504
505 retval = fb_find_mode(&info->var, info, NULL,
506 NULL, 0, NULL, 8);
507
508 if (!retval || (retval == 4))
509 info->var = vfb_default;
Ilya Yanok68e5e9d2007-10-16 01:29:17 -0700510 vfb_fix.smem_start = (unsigned long) videomemory;
511 vfb_fix.smem_len = videomemorysize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 info->fix = vfb_fix;
513 info->pseudo_palette = info->par;
514 info->par = NULL;
515 info->flags = FBINFO_FLAG_DEFAULT;
516
517 retval = fb_alloc_cmap(&info->cmap, 256, 0);
518 if (retval < 0)
519 goto err1;
520
521 retval = register_framebuffer(info);
522 if (retval < 0)
523 goto err2;
Russell King3ae5eae2005-11-09 22:32:44 +0000524 platform_set_drvdata(dev, info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526 printk(KERN_INFO
527 "fb%d: Virtual frame buffer device, using %ldK of video memory\n",
528 info->node, videomemorysize >> 10);
529 return 0;
530err2:
531 fb_dealloc_cmap(&info->cmap);
532err1:
533 framebuffer_release(info);
534err:
Ilya Yanok68e5e9d2007-10-16 01:29:17 -0700535 rvfree(videomemory, videomemorysize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 return retval;
537}
538
Russell King3ae5eae2005-11-09 22:32:44 +0000539static int vfb_remove(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540{
Russell King3ae5eae2005-11-09 22:32:44 +0000541 struct fb_info *info = platform_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543 if (info) {
544 unregister_framebuffer(info);
Ilya Yanok68e5e9d2007-10-16 01:29:17 -0700545 rvfree(videomemory, videomemorysize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 framebuffer_release(info);
547 }
548 return 0;
549}
550
Russell King3ae5eae2005-11-09 22:32:44 +0000551static struct platform_driver vfb_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 .probe = vfb_probe,
553 .remove = vfb_remove,
Russell King3ae5eae2005-11-09 22:32:44 +0000554 .driver = {
555 .name = "vfb",
556 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557};
558
Antonino A. Daplas20cecf62006-06-26 00:26:34 -0700559static struct platform_device *vfb_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
561static int __init vfb_init(void)
562{
563 int ret = 0;
564
565#ifndef MODULE
566 char *option = NULL;
567
568 if (fb_get_options("vfb", &option))
569 return -ENODEV;
570 vfb_setup(option);
571#endif
572
573 if (!vfb_enable)
574 return -ENXIO;
575
Russell King3ae5eae2005-11-09 22:32:44 +0000576 ret = platform_driver_register(&vfb_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
578 if (!ret) {
Antonino A. Daplas20cecf62006-06-26 00:26:34 -0700579 vfb_device = platform_device_alloc("vfb", 0);
580
581 if (vfb_device)
582 ret = platform_device_add(vfb_device);
583 else
584 ret = -ENOMEM;
585
586 if (ret) {
587 platform_device_put(vfb_device);
Russell King3ae5eae2005-11-09 22:32:44 +0000588 platform_driver_unregister(&vfb_driver);
Antonino A. Daplas20cecf62006-06-26 00:26:34 -0700589 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 }
Antonino A. Daplas20cecf62006-06-26 00:26:34 -0700591
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 return ret;
593}
594
595module_init(vfb_init);
596
597#ifdef MODULE
598static void __exit vfb_exit(void)
599{
Antonino A. Daplas20cecf62006-06-26 00:26:34 -0700600 platform_device_unregister(vfb_device);
Russell King3ae5eae2005-11-09 22:32:44 +0000601 platform_driver_unregister(&vfb_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602}
603
604module_exit(vfb_exit);
605
606MODULE_LICENSE("GPL");
607#endif /* MODULE */