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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 | fb_dealloc_cmap(&info->cmap); |
179 | if (info->screen_base) |
180 | iounmap(info->screen_base); |
181 | release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size); |
182 | framebuffer_release(info); |
183 | } |
184 | |
185 | static struct fb_ops vesafb_ops = { |
186 | .owner = THIS_MODULE, |
187 | .fb_destroy = vesafb_destroy, |
188 | .fb_setcolreg = vesafb_setcolreg, |
189 | .fb_pan_display = vesafb_pan_display, |
190 | .fb_fillrect = cfb_fillrect, |
191 | .fb_copyarea = cfb_copyarea, |
192 | .fb_imageblit = cfb_imageblit, |
193 | }; |
194 | |
195 | static int __init vesafb_setup(char *options) |
196 | { |
197 | char *this_opt; |
198 | |
199 | if (!options || !*options) |
200 | return 0; |
201 | |
202 | while ((this_opt = strsep(&options, ",")) != NULL) { |
203 | if (!*this_opt) continue; |
204 | |
205 | if (! strcmp(this_opt, "inverse")) |
206 | inverse=1; |
207 | else if (! strcmp(this_opt, "redraw")) |
208 | ypan=0; |
209 | else if (! strcmp(this_opt, "ypan")) |
210 | ypan=1; |
211 | else if (! strcmp(this_opt, "ywrap")) |
212 | ypan=2; |
213 | else if (! strcmp(this_opt, "vgapal")) |
214 | pmi_setpal=0; |
215 | else if (! strcmp(this_opt, "pmipal")) |
216 | pmi_setpal=1; |
217 | else if (! strncmp(this_opt, "mtrr:", 5)) |
218 | mtrr = simple_strtoul(this_opt+5, NULL, 0); |
219 | else if (! strcmp(this_opt, "nomtrr")) |
220 | mtrr=0; |
221 | else if (! strncmp(this_opt, "vtotal:", 7)) |
222 | vram_total = simple_strtoul(this_opt+7, NULL, 0); |
223 | else if (! strncmp(this_opt, "vremap:", 7)) |
224 | vram_remap = simple_strtoul(this_opt+7, NULL, 0); |
225 | } |
226 | return 0; |
227 | } |
228 | |
229 | static int __init vesafb_probe(struct platform_device *dev) |
230 | { |
231 | struct fb_info *info; |
232 | int i, err; |
233 | unsigned int size_vmode; |
234 | unsigned int size_remap; |
235 | unsigned int size_total; |
236 | |
237 | if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB) |
238 | return -ENODEV; |
239 | |
240 | vga_compat = (screen_info.capabilities & 2) ? 0 : 1; |
241 | vesafb_fix.smem_start = screen_info.lfb_base; |
242 | vesafb_defined.bits_per_pixel = screen_info.lfb_depth; |
243 | if (15 == vesafb_defined.bits_per_pixel) |
244 | vesafb_defined.bits_per_pixel = 16; |
245 | vesafb_defined.xres = screen_info.lfb_width; |
246 | vesafb_defined.yres = screen_info.lfb_height; |
247 | vesafb_fix.line_length = screen_info.lfb_linelength; |
248 | vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ? |
249 | FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR; |
250 | |
251 | /* size_vmode -- that is the amount of memory needed for the |
252 | * used video mode, i.e. the minimum amount of |
253 | * memory we need. */ |
254 | size_vmode = vesafb_defined.yres * vesafb_fix.line_length; |
255 | |
256 | /* size_total -- all video memory we have. Used for mtrr |
257 | * entries, resource allocation and bounds |
258 | * checking. */ |
259 | size_total = screen_info.lfb_size * 65536; |
260 | if (vram_total) |
261 | size_total = vram_total * 1024 * 1024; |
262 | if (size_total < size_vmode) |
263 | size_total = size_vmode; |
264 | |
265 | /* size_remap -- the amount of video memory we are going to |
266 | * use for vesafb. With modern cards it is no |
267 | * option to simply use size_total as that |
268 | * wastes plenty of kernel address space. */ |
269 | size_remap = size_vmode * 2; |
270 | if (vram_remap) |
271 | size_remap = vram_remap * 1024 * 1024; |
272 | if (size_remap < size_vmode) |
273 | size_remap = size_vmode; |
274 | if (size_remap > size_total) |
275 | size_remap = size_total; |
276 | vesafb_fix.smem_len = size_remap; |
277 | |
278 | #ifndef __i386__ |
279 | screen_info.vesapm_seg = 0; |
280 | #endif |
281 | |
282 | if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) { |
283 | printk(KERN_WARNING |
284 | "vesafb: cannot reserve video memory at 0x%lx\n", |
285 | vesafb_fix.smem_start); |
286 | /* We cannot make this fatal. Sometimes this comes from magic |
287 | spaces our resource handlers simply don't know about */ |
288 | } |
289 | |
290 | info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev); |
291 | if (!info) { |
292 | release_mem_region(vesafb_fix.smem_start, size_total); |
293 | return -ENOMEM; |
294 | } |
295 | info->pseudo_palette = info->par; |
296 | info->par = NULL; |
297 | |
298 | /* set vesafb aperture size for generic probing */ |
299 | info->apertures = alloc_apertures(1); |
300 | if (!info->apertures) { |
301 | err = -ENOMEM; |
302 | goto err; |
303 | } |
304 | info->apertures->ranges[0].base = screen_info.lfb_base; |
305 | info->apertures->ranges[0].size = size_total; |
306 | |
307 | printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n", |
308 | vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages); |
309 | |
310 | if (screen_info.vesapm_seg) { |
311 | printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n", |
312 | screen_info.vesapm_seg,screen_info.vesapm_off); |
313 | } |
314 | |
315 | if (screen_info.vesapm_seg < 0xc000) |
316 | ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */ |
317 | |
318 | if (ypan || pmi_setpal) { |
319 | unsigned short *pmi_base; |
320 | pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off); |
321 | pmi_start = (void*)((char*)pmi_base + pmi_base[1]); |
322 | pmi_pal = (void*)((char*)pmi_base + pmi_base[2]); |
323 | printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal); |
324 | if (pmi_base[3]) { |
325 | printk(KERN_INFO "vesafb: pmi: ports = "); |
326 | for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++) |
327 | printk("%x ",pmi_base[i]); |
328 | printk("\n"); |
329 | if (pmi_base[i] != 0xffff) { |
330 | /* |
331 | * memory areas not supported (yet?) |
332 | * |
333 | * Rules are: we have to set up a descriptor for the requested |
334 | * memory area and pass it in the ES register to the BIOS function. |
335 | */ |
336 | printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n"); |
337 | ypan = pmi_setpal = 0; |
338 | } |
339 | } |
340 | } |
341 | |
342 | if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) { |
343 | printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n" |
344 | " colors may be incorrect\n"); |
345 | vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; |
346 | } |
347 | |
348 | vesafb_defined.xres_virtual = vesafb_defined.xres; |
349 | vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length; |
350 | if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) { |
351 | printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n", |
352 | (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual); |
353 | } else { |
354 | printk(KERN_INFO "vesafb: scrolling: redraw\n"); |
355 | vesafb_defined.yres_virtual = vesafb_defined.yres; |
356 | ypan = 0; |
357 | } |
358 | |
359 | /* some dummy values for timing to make fbset happy */ |
360 | vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres; |
361 | vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8; |
362 | vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8; |
363 | |
364 | vesafb_defined.red.offset = screen_info.red_pos; |
365 | vesafb_defined.red.length = screen_info.red_size; |
366 | vesafb_defined.green.offset = screen_info.green_pos; |
367 | vesafb_defined.green.length = screen_info.green_size; |
368 | vesafb_defined.blue.offset = screen_info.blue_pos; |
369 | vesafb_defined.blue.length = screen_info.blue_size; |
370 | vesafb_defined.transp.offset = screen_info.rsvd_pos; |
371 | vesafb_defined.transp.length = screen_info.rsvd_size; |
372 | |
373 | if (vesafb_defined.bits_per_pixel <= 8) { |
374 | depth = vesafb_defined.green.length; |
375 | vesafb_defined.red.length = |
376 | vesafb_defined.green.length = |
377 | vesafb_defined.blue.length = |
378 | vesafb_defined.bits_per_pixel; |
379 | } |
380 | |
381 | printk(KERN_INFO "vesafb: %s: " |
382 | "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", |
383 | (vesafb_defined.bits_per_pixel > 8) ? |
384 | "Truecolor" : (vga_compat || pmi_setpal) ? |
385 | "Pseudocolor" : "Static Pseudocolor", |
386 | screen_info.rsvd_size, |
387 | screen_info.red_size, |
388 | screen_info.green_size, |
389 | screen_info.blue_size, |
390 | screen_info.rsvd_pos, |
391 | screen_info.red_pos, |
392 | screen_info.green_pos, |
393 | screen_info.blue_pos); |
394 | |
395 | vesafb_fix.ypanstep = ypan ? 1 : 0; |
396 | vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0; |
397 | |
398 | /* request failure does not faze us, as vgacon probably has this |
399 | * region already (FIXME) */ |
400 | request_region(0x3c0, 32, "vesafb"); |
401 | |
402 | #ifdef CONFIG_MTRR |
403 | if (mtrr) { |
404 | unsigned int temp_size = size_total; |
405 | unsigned int type = 0; |
406 | |
407 | switch (mtrr) { |
408 | case 1: |
409 | type = MTRR_TYPE_UNCACHABLE; |
410 | break; |
411 | case 2: |
412 | type = MTRR_TYPE_WRBACK; |
413 | break; |
414 | case 3: |
415 | type = MTRR_TYPE_WRCOMB; |
416 | break; |
417 | case 4: |
418 | type = MTRR_TYPE_WRTHROUGH; |
419 | break; |
420 | default: |
421 | type = 0; |
422 | break; |
423 | } |
424 | |
425 | if (type) { |
426 | int rc; |
427 | |
428 | /* Find the largest power-of-two */ |
429 | temp_size = roundup_pow_of_two(temp_size); |
430 | |
431 | /* Try and find a power of two to add */ |
432 | do { |
433 | rc = mtrr_add(vesafb_fix.smem_start, temp_size, |
434 | type, 1); |
435 | temp_size >>= 1; |
436 | } while (temp_size >= PAGE_SIZE && rc == -EINVAL); |
437 | } |
438 | } |
439 | #endif |
440 | |
441 | switch (mtrr) { |
442 | case 1: /* uncachable */ |
443 | info->screen_base = ioremap_nocache(vesafb_fix.smem_start, vesafb_fix.smem_len); |
444 | break; |
445 | case 2: /* write-back */ |
446 | info->screen_base = ioremap_cache(vesafb_fix.smem_start, vesafb_fix.smem_len); |
447 | break; |
448 | case 3: /* write-combining */ |
449 | info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len); |
450 | break; |
451 | case 4: /* write-through */ |
452 | default: |
453 | info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len); |
454 | break; |
455 | } |
456 | if (!info->screen_base) { |
457 | printk(KERN_ERR |
458 | "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n", |
459 | vesafb_fix.smem_len, vesafb_fix.smem_start); |
460 | err = -EIO; |
461 | goto err; |
462 | } |
463 | |
464 | printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, " |
465 | "using %dk, total %dk\n", |
466 | vesafb_fix.smem_start, info->screen_base, |
467 | size_remap/1024, size_total/1024); |
468 | |
469 | info->fbops = &vesafb_ops; |
470 | info->var = vesafb_defined; |
471 | info->fix = vesafb_fix; |
472 | info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE | |
473 | (ypan ? FBINFO_HWACCEL_YPAN : 0); |
474 | |
475 | if (!ypan) |
476 | info->fbops->fb_pan_display = NULL; |
477 | |
478 | if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { |
479 | err = -ENOMEM; |
480 | goto err; |
481 | } |
482 | if (register_framebuffer(info)<0) { |
483 | err = -EINVAL; |
484 | fb_dealloc_cmap(&info->cmap); |
485 | goto err; |
486 | } |
487 | printk(KERN_INFO "fb%d: %s frame buffer device\n", |
488 | info->node, info->fix.id); |
489 | return 0; |
490 | err: |
491 | if (info->screen_base) |
492 | iounmap(info->screen_base); |
493 | framebuffer_release(info); |
494 | release_mem_region(vesafb_fix.smem_start, size_total); |
495 | return err; |
496 | } |
497 | |
498 | static struct platform_driver vesafb_driver = { |
499 | .driver = { |
500 | .name = "vesafb", |
501 | }, |
502 | }; |
503 | |
504 | static struct platform_device *vesafb_device; |
505 | |
506 | static int __init vesafb_init(void) |
507 | { |
508 | int ret; |
509 | char *option = NULL; |
510 | |
511 | /* ignore error return of fb_get_options */ |
512 | fb_get_options("vesafb", &option); |
513 | vesafb_setup(option); |
514 | |
515 | vesafb_device = platform_device_alloc("vesafb", 0); |
516 | if (!vesafb_device) |
517 | return -ENOMEM; |
518 | |
519 | ret = platform_device_add(vesafb_device); |
520 | if (!ret) { |
521 | ret = platform_driver_probe(&vesafb_driver, vesafb_probe); |
522 | if (ret) |
523 | platform_device_del(vesafb_device); |
524 | } |
525 | |
526 | if (ret) { |
527 | platform_device_put(vesafb_device); |
528 | vesafb_device = NULL; |
529 | } |
530 | |
531 | return ret; |
532 | } |
533 | module_init(vesafb_init); |
534 | |
535 | MODULE_LICENSE("GPL"); |
536 |
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