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RT-AC56 3.0.0.4.374.37 core
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / video / vesafb.c
blobe4c9fbdf42ac7f1383f366c30e2af7d514ef7893
1 /*
2 * framebuffer driver for VBE 2.0 compliant graphic boards
3 *
4 * switching to graphics mode happens at boot time (while
5 * running in real mode, see arch/i386/boot/video.S).
6 *
7 * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
8 *
9 */
10
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/mm.h>
16 #include <linux/delay.h>
17 #include <linux/fb.h>
18 #include <linux/ioport.h>
19 #include <linux/init.h>
20 #include <linux/platform_device.h>
21 #include <linux/screen_info.h>
22
23 #include <video/vga.h>
24 #include <asm/io.h>
25 #include <asm/mtrr.h>
26
27 #define dac_reg (0x3c8)
28 #define dac_val (0x3c9)
29
30 /* --------------------------------------------------------------------- */
31
32 static struct fb_var_screeninfo vesafb_defined __initdata = {
33 .activate = FB_ACTIVATE_NOW,
34 .height = -1,
35 .width = -1,
36 .right_margin = 32,
37 .upper_margin = 16,
38 .lower_margin = 4,
39 .vsync_len = 4,
40 .vmode = FB_VMODE_NONINTERLACED,
41 };
42
43 static struct fb_fix_screeninfo vesafb_fix __initdata = {
44 .id = "VESA VGA",
45 .type = FB_TYPE_PACKED_PIXELS,
46 .accel = FB_ACCEL_NONE,
47 };
48
49 static int inverse __read_mostly;
50 static int mtrr __read_mostly; /* disable mtrr */
51 static int vram_remap __initdata; /* Set amount of memory to be used */
52 static int vram_total __initdata; /* Set total amount of memory */
53 static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */
54 static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */
55 static void (*pmi_start)(void) __read_mostly;
56 static void (*pmi_pal) (void) __read_mostly;
57 static int depth __read_mostly;
58 static int vga_compat __read_mostly;
59 /* --------------------------------------------------------------------- */
60
61 static int vesafb_pan_display(struct fb_var_screeninfo *var,
62 struct fb_info *info)
63 {
64 #ifdef __i386__
65 int offset;
66
67 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
68
69 __asm__ __volatile__(
70 "call *(%%edi)"
71 : /* no return value */
72 : "a" (0x4f07), /* EAX */
73 "b" (0), /* EBX */
74 "c" (offset), /* ECX */
75 "d" (offset >> 16), /* EDX */
76 "D" (&pmi_start)); /* EDI */
77 #endif
78 return 0;
79 }
80
81 static int vesa_setpalette(int regno, unsigned red, unsigned green,
82 unsigned blue)
83 {
84 int shift = 16 - depth;
85 int err = -EINVAL;
86
87 /*
88 * Try VGA registers first...
89 */
90 if (vga_compat) {
91 outb_p(regno, dac_reg);
92 outb_p(red >> shift, dac_val);
93 outb_p(green >> shift, dac_val);
94 outb_p(blue >> shift, dac_val);
95 err = 0;
96 }
97
98 #ifdef __i386__
99 /*
100 * Fallback to the PMI....
101 */
102 if (err && pmi_setpal) {
103 struct { u_char blue, green, red, pad; } entry;
104
105 entry.red = red >> shift;
106 entry.green = green >> shift;
107 entry.blue = blue >> shift;
108 entry.pad = 0;
109 __asm__ __volatile__(
110 "call *(%%esi)"
111 : /* no return value */
112 : "a" (0x4f09), /* EAX */
113 "b" (0), /* EBX */
114 "c" (1), /* ECX */
115 "d" (regno), /* EDX */
116 "D" (&entry), /* EDI */
117 "S" (&pmi_pal)); /* ESI */
118 err = 0;
119 }
120 #endif
121
122 return err;
123 }
124
125 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
126 unsigned blue, unsigned transp,
127 struct fb_info *info)
128 {
129 int err = 0;
130
131 /*
132 * Set a single color register. The values supplied are
133 * already rounded down to the hardware's capabilities
134 * (according to the entries in the `var' structure). Return
135 * != 0 for invalid regno.
136 */
137
138 if (regno >= info->cmap.len)
139 return 1;
140
141 if (info->var.bits_per_pixel == 8)
142 err = vesa_setpalette(regno,red,green,blue);
143 else if (regno < 16) {
144 switch (info->var.bits_per_pixel) {
145 case 16:
146 if (info->var.red.offset == 10) {
147 /* 1:5:5:5 */
148 ((u32*) (info->pseudo_palette))[regno] =
149 ((red & 0xf800) >> 1) |
150 ((green & 0xf800) >> 6) |
151 ((blue & 0xf800) >> 11);
152 } else {
153 /* 0:5:6:5 */
154 ((u32*) (info->pseudo_palette))[regno] =
155 ((red & 0xf800) ) |
156 ((green & 0xfc00) >> 5) |
157 ((blue & 0xf800) >> 11);
158 }
159 break;
160 case 24:
161 case 32:
162 red >>= 8;
163 green >>= 8;
164 blue >>= 8;
165 ((u32 *)(info->pseudo_palette))[regno] =
166 (red << info->var.red.offset) |
167 (green << info->var.green.offset) |
168 (blue << info->var.blue.offset);
169 break;
170 }
171 }
172
173 return err;
174 }
175
176 static void vesafb_destroy(struct fb_info *info)
177 {
178 if (info->screen_base)
179 iounmap(info->screen_base);
180 release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
181 framebuffer_release(info);
182 }
183
184 static struct fb_ops vesafb_ops = {
185 .owner = THIS_MODULE,
186 .fb_destroy = vesafb_destroy,
187 .fb_setcolreg = vesafb_setcolreg,
188 .fb_pan_display = vesafb_pan_display,
189 .fb_fillrect = cfb_fillrect,
190 .fb_copyarea = cfb_copyarea,
191 .fb_imageblit = cfb_imageblit,
192 };
193
194 static int __init vesafb_setup(char *options)
195 {
196 char *this_opt;
197
198 if (!options || !*options)
199 return 0;
200
201 while ((this_opt = strsep(&options, ",")) != NULL) {
202 if (!*this_opt) continue;
203
204 if (! strcmp(this_opt, "inverse"))
205 inverse=1;
206 else if (! strcmp(this_opt, "redraw"))
207 ypan=0;
208 else if (! strcmp(this_opt, "ypan"))
209 ypan=1;
210 else if (! strcmp(this_opt, "ywrap"))
211 ypan=2;
212 else if (! strcmp(this_opt, "vgapal"))
213 pmi_setpal=0;
214 else if (! strcmp(this_opt, "pmipal"))
215 pmi_setpal=1;
216 else if (! strncmp(this_opt, "mtrr:", 5))
217 mtrr = simple_strtoul(this_opt+5, NULL, 0);
218 else if (! strcmp(this_opt, "nomtrr"))
219 mtrr=0;
220 else if (! strncmp(this_opt, "vtotal:", 7))
221 vram_total = simple_strtoul(this_opt+7, NULL, 0);
222 else if (! strncmp(this_opt, "vremap:", 7))
223 vram_remap = simple_strtoul(this_opt+7, NULL, 0);
224 }
225 return 0;
226 }
227
228 static int __init vesafb_probe(struct platform_device *dev)
229 {
230 struct fb_info *info;
231 int i, err;
232 unsigned int size_vmode;
233 unsigned int size_remap;
234 unsigned int size_total;
235
236 if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
237 return -ENODEV;
238
239 vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
240 vesafb_fix.smem_start = screen_info.lfb_base;
241 vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
242 if (15 == vesafb_defined.bits_per_pixel)
243 vesafb_defined.bits_per_pixel = 16;
244 vesafb_defined.xres = screen_info.lfb_width;
245 vesafb_defined.yres = screen_info.lfb_height;
246 vesafb_fix.line_length = screen_info.lfb_linelength;
247 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ?
248 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
249
250 /* size_vmode -- that is the amount of memory needed for the
251 * used video mode, i.e. the minimum amount of
252 * memory we need. */
253 size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
254
255 /* size_total -- all video memory we have. Used for mtrr
256 * entries, ressource allocation and bounds
257 * checking. */
258 size_total = screen_info.lfb_size * 65536;
259 if (vram_total)
260 size_total = vram_total * 1024 * 1024;
261 if (size_total < size_vmode)
262 size_total = size_vmode;
263
264 /* size_remap -- the amount of video memory we are going to
265 * use for vesafb. With modern cards it is no
266 * option to simply use size_total as that
267 * wastes plenty of kernel address space. */
268 size_remap = size_vmode * 2;
269 if (vram_remap)
270 size_remap = vram_remap * 1024 * 1024;
271 if (size_remap < size_vmode)
272 size_remap = size_vmode;
273 if (size_remap > size_total)
274 size_remap = size_total;
275 vesafb_fix.smem_len = size_remap;
276
277 #ifndef __i386__
278 screen_info.vesapm_seg = 0;
279 #endif
280
281 if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
282 printk(KERN_WARNING
283 "vesafb: cannot reserve video memory at 0x%lx\n",
284 vesafb_fix.smem_start);
285 /* We cannot make this fatal. Sometimes this comes from magic
286 spaces our resource handlers simply don't know about */
287 }
288
289 info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
290 if (!info) {
291 release_mem_region(vesafb_fix.smem_start, size_total);
292 return -ENOMEM;
293 }
294 info->pseudo_palette = info->par;
295 info->par = NULL;
296
297 /* set vesafb aperture size for generic probing */
298 info->apertures = alloc_apertures(1);
299 if (!info->apertures) {
300 err = -ENOMEM;
301 goto err;
302 }
303 info->apertures->ranges[0].base = screen_info.lfb_base;
304 info->apertures->ranges[0].size = size_total;
305
306 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
307 if (!info->screen_base) {
308 printk(KERN_ERR
309 "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
310 vesafb_fix.smem_len, vesafb_fix.smem_start);
311 err = -EIO;
312 goto err;
313 }
314
315 printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
316 "using %dk, total %dk\n",
317 vesafb_fix.smem_start, info->screen_base,
318 size_remap/1024, size_total/1024);
319 printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
320 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
321
322 if (screen_info.vesapm_seg) {
323 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
324 screen_info.vesapm_seg,screen_info.vesapm_off);
325 }
326
327 if (screen_info.vesapm_seg < 0xc000)
328 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
329
330 if (ypan || pmi_setpal) {
331 unsigned short *pmi_base;
332 pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
333 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
334 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]);
335 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
336 if (pmi_base[3]) {
337 printk(KERN_INFO "vesafb: pmi: ports = ");
338 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
339 printk("%x ",pmi_base[i]);
340 printk("\n");
341 if (pmi_base[i] != 0xffff) {
342 /*
343 * memory areas not supported (yet?)
344 *
345 * Rules are: we have to set up a descriptor for the requested
346 * memory area and pass it in the ES register to the BIOS function.
347 */
348 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
349 ypan = pmi_setpal = 0;
350 }
351 }
352 }
353
354 if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
355 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
356 " colors may be incorrect\n");
357 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
358 }
359
360 vesafb_defined.xres_virtual = vesafb_defined.xres;
361 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
362 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
363 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
364 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
365 } else {
366 printk(KERN_INFO "vesafb: scrolling: redraw\n");
367 vesafb_defined.yres_virtual = vesafb_defined.yres;
368 ypan = 0;
369 }
370
371 /* some dummy values for timing to make fbset happy */
372 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
373 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8;
374 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8;
375
376 vesafb_defined.red.offset = screen_info.red_pos;
377 vesafb_defined.red.length = screen_info.red_size;
378 vesafb_defined.green.offset = screen_info.green_pos;
379 vesafb_defined.green.length = screen_info.green_size;
380 vesafb_defined.blue.offset = screen_info.blue_pos;
381 vesafb_defined.blue.length = screen_info.blue_size;
382 vesafb_defined.transp.offset = screen_info.rsvd_pos;
383 vesafb_defined.transp.length = screen_info.rsvd_size;
384
385 if (vesafb_defined.bits_per_pixel <= 8) {
386 depth = vesafb_defined.green.length;
387 vesafb_defined.red.length =
388 vesafb_defined.green.length =
389 vesafb_defined.blue.length =
390 vesafb_defined.bits_per_pixel;
391 }
392
393 printk(KERN_INFO "vesafb: %s: "
394 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
395 (vesafb_defined.bits_per_pixel > 8) ?
396 "Truecolor" : (vga_compat || pmi_setpal) ?
397 "Pseudocolor" : "Static Pseudocolor",
398 screen_info.rsvd_size,
399 screen_info.red_size,
400 screen_info.green_size,
401 screen_info.blue_size,
402 screen_info.rsvd_pos,
403 screen_info.red_pos,
404 screen_info.green_pos,
405 screen_info.blue_pos);
406
407 vesafb_fix.ypanstep = ypan ? 1 : 0;
408 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
409
410 request_region(0x3c0, 32, "vesafb");
411
412 #ifdef CONFIG_MTRR
413 if (mtrr) {
414 unsigned int temp_size = size_total;
415 unsigned int type = 0;
416
417 switch (mtrr) {
418 case 1:
419 type = MTRR_TYPE_UNCACHABLE;
420 break;
421 case 2:
422 type = MTRR_TYPE_WRBACK;
423 break;
424 case 3:
425 type = MTRR_TYPE_WRCOMB;
426 break;
427 case 4:
428 type = MTRR_TYPE_WRTHROUGH;
429 break;
430 default:
431 type = 0;
432 break;
433 }
434
435 if (type) {
436 int rc;
437
438 /* Find the largest power-of-two */
439 while (temp_size & (temp_size - 1))
440 temp_size &= (temp_size - 1);
441
442 /* Try and find a power of two to add */
443 do {
444 rc = mtrr_add(vesafb_fix.smem_start, temp_size,
445 type, 1);
446 temp_size >>= 1;
447 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
448 }
449 }
450 #endif
451
452 info->fbops = &vesafb_ops;
453 info->var = vesafb_defined;
454 info->fix = vesafb_fix;
455 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
456 (ypan ? FBINFO_HWACCEL_YPAN : 0);
457
458 if (!ypan)
459 info->fbops->fb_pan_display = NULL;
460
461 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
462 err = -ENOMEM;
463 goto err;
464 }
465 if (register_framebuffer(info)<0) {
466 err = -EINVAL;
467 fb_dealloc_cmap(&info->cmap);
468 goto err;
469 }
470 printk(KERN_INFO "fb%d: %s frame buffer device\n",
471 info->node, info->fix.id);
472 return 0;
473 err:
474 if (info->screen_base)
475 iounmap(info->screen_base);
476 framebuffer_release(info);
477 release_mem_region(vesafb_fix.smem_start, size_total);
478 return err;
479 }
480
481 static struct platform_driver vesafb_driver = {
482 .driver = {
483 .name = "vesafb",
484 },
485 };
486
487 static struct platform_device *vesafb_device;
488
489 static int __init vesafb_init(void)
490 {
491 int ret;
492 char *option = NULL;
493
494 /* ignore error return of fb_get_options */
495 fb_get_options("vesafb", &option);
496 vesafb_setup(option);
497
498 vesafb_device = platform_device_alloc("vesafb", 0);
499 if (!vesafb_device)
500 return -ENOMEM;
501
502 ret = platform_device_add(vesafb_device);
503 if (!ret) {
504 ret = platform_driver_probe(&vesafb_driver, vesafb_probe);
505 if (ret)
506 platform_device_del(vesafb_device);
507 }
508
509 if (ret) {
510 platform_device_put(vesafb_device);
511 vesafb_device = NULL;
512 }
513
514 return ret;
515 }
516 module_init(vesafb_init);
517
518 MODULE_LICENSE("GPL");
Tomato firmware and modifications.