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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/slab.h> |
17 | #include <linux/delay.h> |
18 | #include <linux/fb.h> |
19 | #include <linux/ioport.h> |
20 | #include <linux/init.h> |
21 | #include <linux/platform_device.h> |
22 | #include <linux/screen_info.h> |
23 | |
24 | #include <video/vga.h> |
25 | #include <asm/io.h> |
26 | #include <asm/mtrr.h> |
27 | |
28 | #define dac_reg (0x3c8) |
29 | #define dac_val (0x3c9) |
30 | |
31 | /* --------------------------------------------------------------------- */ |
32 | |
33 | static struct fb_var_screeninfo vesafb_defined __initdata = { |
34 | .activate = FB_ACTIVATE_NOW, |
35 | .height = -1, |
36 | .width = -1, |
37 | .right_margin = 32, |
38 | .upper_margin = 16, |
39 | .lower_margin = 4, |
40 | .vsync_len = 4, |
41 | .vmode = FB_VMODE_NONINTERLACED, |
42 | }; |
43 | |
44 | static struct fb_fix_screeninfo vesafb_fix __initdata = { |
45 | .id = "VESA VGA", |
46 | .type = FB_TYPE_PACKED_PIXELS, |
47 | .accel = FB_ACCEL_NONE, |
48 | }; |
49 | |
50 | static int inverse __read_mostly; |
51 | static int mtrr __read_mostly; /* disable mtrr */ |
52 | static int vram_remap __initdata; /* Set amount of memory to be used */ |
53 | static int vram_total __initdata; /* Set total amount of memory */ |
54 | static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */ |
55 | static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */ |
56 | static void (*pmi_start)(void) __read_mostly; |
57 | static void (*pmi_pal) (void) __read_mostly; |
58 | static int depth __read_mostly; |
59 | static int vga_compat __read_mostly; |
60 | /* --------------------------------------------------------------------- */ |
61 | |
62 | static int vesafb_pan_display(struct fb_var_screeninfo *var, |
63 | struct fb_info *info) |
64 | { |
65 | #ifdef __i386__ |
66 | int offset; |
67 | |
68 | offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4; |
69 | |
70 | __asm__ __volatile__( |
71 | "call *(%%edi)" |
72 | : /* no return value */ |
73 | : "a" (0x4f07), /* EAX */ |
74 | "b" (0), /* EBX */ |
75 | "c" (offset), /* ECX */ |
76 | "d" (offset >> 16), /* EDX */ |
77 | "D" (&pmi_start)); /* EDI */ |
78 | #endif |
79 | return 0; |
80 | } |
81 | |
82 | static int vesa_setpalette(int regno, unsigned red, unsigned green, |
83 | unsigned blue) |
84 | { |
85 | int shift = 16 - depth; |
86 | int err = -EINVAL; |
87 | |
88 | /* |
89 | * Try VGA registers first... |
90 | */ |
91 | if (vga_compat) { |
92 | outb_p(regno, dac_reg); |
93 | outb_p(red >> shift, dac_val); |
94 | outb_p(green >> shift, dac_val); |
95 | outb_p(blue >> shift, dac_val); |
96 | err = 0; |
97 | } |
98 | |
99 | #ifdef __i386__ |
100 | /* |
101 | * Fallback to the PMI.... |
102 | */ |
103 | if (err && pmi_setpal) { |
104 | struct { u_char blue, green, red, pad; } entry; |
105 | |
106 | entry.red = red >> shift; |
107 | entry.green = green >> shift; |
108 | entry.blue = blue >> shift; |
109 | entry.pad = 0; |
110 | __asm__ __volatile__( |
111 | "call *(%%esi)" |
112 | : /* no return value */ |
113 | : "a" (0x4f09), /* EAX */ |
114 | "b" (0), /* EBX */ |
115 | "c" (1), /* ECX */ |
116 | "d" (regno), /* EDX */ |
117 | "D" (&entry), /* EDI */ |
118 | "S" (&pmi_pal)); /* ESI */ |
119 | err = 0; |
120 | } |
121 | #endif |
122 | |
123 | return err; |
124 | } |
125 | |
126 | static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green, |
127 | unsigned blue, unsigned transp, |
128 | struct fb_info *info) |
129 | { |
130 | int err = 0; |
131 | |
132 | /* |
133 | * Set a single color register. The values supplied are |
134 | * already rounded down to the hardware's capabilities |
135 | * (according to the entries in the `var' structure). Return |
136 | * != 0 for invalid regno. |
137 | */ |
138 | |
139 | if (regno >= info->cmap.len) |
140 | return 1; |
141 | |
142 | if (info->var.bits_per_pixel == 8) |
143 | err = vesa_setpalette(regno,red,green,blue); |
144 | else if (regno < 16) { |
145 | switch (info->var.bits_per_pixel) { |
146 | case 16: |
147 | if (info->var.red.offset == 10) { |
148 | /* 1:5:5:5 */ |
149 | ((u32*) (info->pseudo_palette))[regno] = |
150 | ((red & 0xf800) >> 1) | |
151 | ((green & 0xf800) >> 6) | |
152 | ((blue & 0xf800) >> 11); |
153 | } else { |
154 | /* 0:5:6:5 */ |
155 | ((u32*) (info->pseudo_palette))[regno] = |
156 | ((red & 0xf800) ) | |
157 | ((green & 0xfc00) >> 5) | |
158 | ((blue & 0xf800) >> 11); |
159 | } |
160 | break; |
161 | case 24: |
162 | case 32: |
163 | red >>= 8; |
164 | green >>= 8; |
165 | blue >>= 8; |
166 | ((u32 *)(info->pseudo_palette))[regno] = |
167 | (red << info->var.red.offset) | |
168 | (green << info->var.green.offset) | |
169 | (blue << info->var.blue.offset); |
170 | break; |
171 | } |
172 | } |
173 | |
174 | return err; |
175 | } |
176 | |
177 | static void vesafb_destroy(struct fb_info *info) |
178 | { |
179 | if (info->screen_base) |
180 | iounmap(info->screen_base); |
181 | release_mem_region(info->aperture_base, info->aperture_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, ressource 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->aperture_base = screen_info.lfb_base; |
300 | info->aperture_size = size_total; |
301 | |
302 | info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len); |
303 | if (!info->screen_base) { |
304 | printk(KERN_ERR |
305 | "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n", |
306 | vesafb_fix.smem_len, vesafb_fix.smem_start); |
307 | err = -EIO; |
308 | goto err; |
309 | } |
310 | |
311 | printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, " |
312 | "using %dk, total %dk\n", |
313 | vesafb_fix.smem_start, info->screen_base, |
314 | size_remap/1024, size_total/1024); |
315 | printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n", |
316 | vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages); |
317 | |
318 | if (screen_info.vesapm_seg) { |
319 | printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n", |
320 | screen_info.vesapm_seg,screen_info.vesapm_off); |
321 | } |
322 | |
323 | if (screen_info.vesapm_seg < 0xc000) |
324 | ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */ |
325 | |
326 | if (ypan || pmi_setpal) { |
327 | unsigned short *pmi_base; |
328 | pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off); |
329 | pmi_start = (void*)((char*)pmi_base + pmi_base[1]); |
330 | pmi_pal = (void*)((char*)pmi_base + pmi_base[2]); |
331 | printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal); |
332 | if (pmi_base[3]) { |
333 | printk(KERN_INFO "vesafb: pmi: ports = "); |
334 | for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++) |
335 | printk("%x ",pmi_base[i]); |
336 | printk("\n"); |
337 | if (pmi_base[i] != 0xffff) { |
338 | /* |
339 | * memory areas not supported (yet?) |
340 | * |
341 | * Rules are: we have to set up a descriptor for the requested |
342 | * memory area and pass it in the ES register to the BIOS function. |
343 | */ |
344 | printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n"); |
345 | ypan = pmi_setpal = 0; |
346 | } |
347 | } |
348 | } |
349 | |
350 | if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) { |
351 | printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n" |
352 | " colors may be incorrect\n"); |
353 | vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; |
354 | } |
355 | |
356 | vesafb_defined.xres_virtual = vesafb_defined.xres; |
357 | vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length; |
358 | if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) { |
359 | printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n", |
360 | (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual); |
361 | } else { |
362 | printk(KERN_INFO "vesafb: scrolling: redraw\n"); |
363 | vesafb_defined.yres_virtual = vesafb_defined.yres; |
364 | ypan = 0; |
365 | } |
366 | |
367 | /* some dummy values for timing to make fbset happy */ |
368 | vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres; |
369 | vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8; |
370 | vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8; |
371 | |
372 | vesafb_defined.red.offset = screen_info.red_pos; |
373 | vesafb_defined.red.length = screen_info.red_size; |
374 | vesafb_defined.green.offset = screen_info.green_pos; |
375 | vesafb_defined.green.length = screen_info.green_size; |
376 | vesafb_defined.blue.offset = screen_info.blue_pos; |
377 | vesafb_defined.blue.length = screen_info.blue_size; |
378 | vesafb_defined.transp.offset = screen_info.rsvd_pos; |
379 | vesafb_defined.transp.length = screen_info.rsvd_size; |
380 | |
381 | if (vesafb_defined.bits_per_pixel <= 8) { |
382 | depth = vesafb_defined.green.length; |
383 | vesafb_defined.red.length = |
384 | vesafb_defined.green.length = |
385 | vesafb_defined.blue.length = |
386 | vesafb_defined.bits_per_pixel; |
387 | } |
388 | |
389 | printk(KERN_INFO "vesafb: %s: " |
390 | "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", |
391 | (vesafb_defined.bits_per_pixel > 8) ? |
392 | "Truecolor" : (vga_compat || pmi_setpal) ? |
393 | "Pseudocolor" : "Static Pseudocolor", |
394 | screen_info.rsvd_size, |
395 | screen_info.red_size, |
396 | screen_info.green_size, |
397 | screen_info.blue_size, |
398 | screen_info.rsvd_pos, |
399 | screen_info.red_pos, |
400 | screen_info.green_pos, |
401 | screen_info.blue_pos); |
402 | |
403 | vesafb_fix.ypanstep = ypan ? 1 : 0; |
404 | vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0; |
405 | |
406 | /* request failure does not faze us, as vgacon probably has this |
407 | * region already (FIXME) */ |
408 | request_region(0x3c0, 32, "vesafb"); |
409 | |
410 | #ifdef CONFIG_MTRR |
411 | if (mtrr) { |
412 | unsigned int temp_size = size_total; |
413 | unsigned int type = 0; |
414 | |
415 | switch (mtrr) { |
416 | case 1: |
417 | type = MTRR_TYPE_UNCACHABLE; |
418 | break; |
419 | case 2: |
420 | type = MTRR_TYPE_WRBACK; |
421 | break; |
422 | case 3: |
423 | type = MTRR_TYPE_WRCOMB; |
424 | break; |
425 | case 4: |
426 | type = MTRR_TYPE_WRTHROUGH; |
427 | break; |
428 | default: |
429 | type = 0; |
430 | break; |
431 | } |
432 | |
433 | if (type) { |
434 | int rc; |
435 | |
436 | /* Find the largest power-of-two */ |
437 | while (temp_size & (temp_size - 1)) |
438 | temp_size &= (temp_size - 1); |
439 | |
440 | /* Try and find a power of two to add */ |
441 | do { |
442 | rc = mtrr_add(vesafb_fix.smem_start, temp_size, |
443 | type, 1); |
444 | temp_size >>= 1; |
445 | } while (temp_size >= PAGE_SIZE && rc == -EINVAL); |
446 | } |
447 | } |
448 | #endif |
449 | |
450 | info->fbops = &vesafb_ops; |
451 | info->var = vesafb_defined; |
452 | info->fix = vesafb_fix; |
453 | info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE | |
454 | (ypan ? FBINFO_HWACCEL_YPAN : 0); |
455 | |
456 | if (!ypan) |
457 | info->fbops->fb_pan_display = NULL; |
458 | |
459 | if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { |
460 | err = -ENOMEM; |
461 | goto err; |
462 | } |
463 | if (register_framebuffer(info)<0) { |
464 | err = -EINVAL; |
465 | fb_dealloc_cmap(&info->cmap); |
466 | goto err; |
467 | } |
468 | printk(KERN_INFO "fb%d: %s frame buffer device\n", |
469 | info->node, info->fix.id); |
470 | return 0; |
471 | err: |
472 | if (info->screen_base) |
473 | iounmap(info->screen_base); |
474 | framebuffer_release(info); |
475 | release_mem_region(vesafb_fix.smem_start, size_total); |
476 | return err; |
477 | } |
478 | |
479 | static struct platform_driver vesafb_driver = { |
480 | .probe = vesafb_probe, |
481 | .driver = { |
482 | .name = "vesafb", |
483 | }, |
484 | }; |
485 | |
486 | static struct platform_device *vesafb_device; |
487 | |
488 | static int __init vesafb_init(void) |
489 | { |
490 | int ret; |
491 | char *option = NULL; |
492 | |
493 | /* ignore error return of fb_get_options */ |
494 | fb_get_options("vesafb", &option); |
495 | vesafb_setup(option); |
496 | ret = platform_driver_register(&vesafb_driver); |
497 | |
498 | if (!ret) { |
499 | vesafb_device = platform_device_alloc("vesafb", 0); |
500 | |
501 | if (vesafb_device) |
502 | ret = platform_device_add(vesafb_device); |
503 | else |
504 | ret = -ENOMEM; |
505 | |
506 | if (ret) { |
507 | platform_device_put(vesafb_device); |
508 | platform_driver_unregister(&vesafb_driver); |
509 | } |
510 | } |
511 | |
512 | return ret; |
513 | } |
514 | module_init(vesafb_init); |
515 | |
516 | MODULE_LICENSE("GPL"); |
517 |
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