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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 | if (info->screen_base) |
179 | iounmap(info->screen_base); |
180 | release_mem_region(info->aperture_base, info->aperture_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->aperture_base = screen_info.lfb_base; |
299 | info->aperture_size = size_total; |
300 | |
301 | info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len); |
302 | if (!info->screen_base) { |
303 | printk(KERN_ERR |
304 | "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n", |
305 | vesafb_fix.smem_len, vesafb_fix.smem_start); |
306 | err = -EIO; |
307 | goto err; |
308 | } |
309 | |
310 | printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, " |
311 | "using %dk, total %dk\n", |
312 | vesafb_fix.smem_start, info->screen_base, |
313 | size_remap/1024, size_total/1024); |
314 | printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n", |
315 | vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages); |
316 | |
317 | if (screen_info.vesapm_seg) { |
318 | printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n", |
319 | screen_info.vesapm_seg,screen_info.vesapm_off); |
320 | } |
321 | |
322 | if (screen_info.vesapm_seg < 0xc000) |
323 | ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */ |
324 | |
325 | if (ypan || pmi_setpal) { |
326 | unsigned short *pmi_base; |
327 | pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off); |
328 | pmi_start = (void*)((char*)pmi_base + pmi_base[1]); |
329 | pmi_pal = (void*)((char*)pmi_base + pmi_base[2]); |
330 | printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal); |
331 | if (pmi_base[3]) { |
332 | printk(KERN_INFO "vesafb: pmi: ports = "); |
333 | for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++) |
334 | printk("%x ",pmi_base[i]); |
335 | printk("\n"); |
336 | if (pmi_base[i] != 0xffff) { |
337 | /* |
338 | * memory areas not supported (yet?) |
339 | * |
340 | * Rules are: we have to set up a descriptor for the requested |
341 | * memory area and pass it in the ES register to the BIOS function. |
342 | */ |
343 | printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n"); |
344 | ypan = pmi_setpal = 0; |
345 | } |
346 | } |
347 | } |
348 | |
349 | if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) { |
350 | printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n" |
351 | " colors may be incorrect\n"); |
352 | vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; |
353 | } |
354 | |
355 | vesafb_defined.xres_virtual = vesafb_defined.xres; |
356 | vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length; |
357 | if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) { |
358 | printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n", |
359 | (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual); |
360 | } else { |
361 | printk(KERN_INFO "vesafb: scrolling: redraw\n"); |
362 | vesafb_defined.yres_virtual = vesafb_defined.yres; |
363 | ypan = 0; |
364 | } |
365 | |
366 | /* some dummy values for timing to make fbset happy */ |
367 | vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres; |
368 | vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8; |
369 | vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8; |
370 | |
371 | vesafb_defined.red.offset = screen_info.red_pos; |
372 | vesafb_defined.red.length = screen_info.red_size; |
373 | vesafb_defined.green.offset = screen_info.green_pos; |
374 | vesafb_defined.green.length = screen_info.green_size; |
375 | vesafb_defined.blue.offset = screen_info.blue_pos; |
376 | vesafb_defined.blue.length = screen_info.blue_size; |
377 | vesafb_defined.transp.offset = screen_info.rsvd_pos; |
378 | vesafb_defined.transp.length = screen_info.rsvd_size; |
379 | |
380 | if (vesafb_defined.bits_per_pixel <= 8) { |
381 | depth = vesafb_defined.green.length; |
382 | vesafb_defined.red.length = |
383 | vesafb_defined.green.length = |
384 | vesafb_defined.blue.length = |
385 | vesafb_defined.bits_per_pixel; |
386 | } |
387 | |
388 | printk(KERN_INFO "vesafb: %s: " |
389 | "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", |
390 | (vesafb_defined.bits_per_pixel > 8) ? |
391 | "Truecolor" : (vga_compat || pmi_setpal) ? |
392 | "Pseudocolor" : "Static Pseudocolor", |
393 | screen_info.rsvd_size, |
394 | screen_info.red_size, |
395 | screen_info.green_size, |
396 | screen_info.blue_size, |
397 | screen_info.rsvd_pos, |
398 | screen_info.red_pos, |
399 | screen_info.green_pos, |
400 | screen_info.blue_pos); |
401 | |
402 | vesafb_fix.ypanstep = ypan ? 1 : 0; |
403 | vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0; |
404 | |
405 | /* request failure does not faze us, as vgacon probably has this |
406 | * region already (FIXME) */ |
407 | request_region(0x3c0, 32, "vesafb"); |
408 | |
409 | #ifdef CONFIG_MTRR |
410 | if (mtrr) { |
411 | unsigned int temp_size = size_total; |
412 | unsigned int type = 0; |
413 | |
414 | switch (mtrr) { |
415 | case 1: |
416 | type = MTRR_TYPE_UNCACHABLE; |
417 | break; |
418 | case 2: |
419 | type = MTRR_TYPE_WRBACK; |
420 | break; |
421 | case 3: |
422 | type = MTRR_TYPE_WRCOMB; |
423 | break; |
424 | case 4: |
425 | type = MTRR_TYPE_WRTHROUGH; |
426 | break; |
427 | default: |
428 | type = 0; |
429 | break; |
430 | } |
431 | |
432 | if (type) { |
433 | int rc; |
434 | |
435 | /* Find the largest power-of-two */ |
436 | while (temp_size & (temp_size - 1)) |
437 | temp_size &= (temp_size - 1); |
438 | |
439 | /* Try and find a power of two to add */ |
440 | do { |
441 | rc = mtrr_add(vesafb_fix.smem_start, temp_size, |
442 | type, 1); |
443 | temp_size >>= 1; |
444 | } while (temp_size >= PAGE_SIZE && rc == -EINVAL); |
445 | } |
446 | } |
447 | #endif |
448 | |
449 | info->fbops = &vesafb_ops; |
450 | info->var = vesafb_defined; |
451 | info->fix = vesafb_fix; |
452 | info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE | |
453 | (ypan ? FBINFO_HWACCEL_YPAN : 0); |
454 | |
455 | if (!ypan) |
456 | info->fbops->fb_pan_display = NULL; |
457 | |
458 | if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { |
459 | err = -ENOMEM; |
460 | goto err; |
461 | } |
462 | if (register_framebuffer(info)<0) { |
463 | err = -EINVAL; |
464 | fb_dealloc_cmap(&info->cmap); |
465 | goto err; |
466 | } |
467 | printk(KERN_INFO "fb%d: %s frame buffer device\n", |
468 | info->node, info->fix.id); |
469 | return 0; |
470 | err: |
471 | if (info->screen_base) |
472 | iounmap(info->screen_base); |
473 | framebuffer_release(info); |
474 | release_mem_region(vesafb_fix.smem_start, size_total); |
475 | return err; |
476 | } |
477 | |
478 | static struct platform_driver vesafb_driver = { |
479 | .driver = { |
480 | .name = "vesafb", |
481 | }, |
482 | }; |
483 | |
484 | static struct platform_device *vesafb_device; |
485 | |
486 | static int __init vesafb_init(void) |
487 | { |
488 | int ret; |
489 | char *option = NULL; |
490 | |
491 | /* ignore error return of fb_get_options */ |
492 | fb_get_options("vesafb", &option); |
493 | vesafb_setup(option); |
494 | |
495 | vesafb_device = platform_device_alloc("vesafb", 0); |
496 | if (!vesafb_device) |
497 | return -ENOMEM; |
498 | |
499 | ret = platform_device_add(vesafb_device); |
500 | if (!ret) { |
501 | ret = platform_driver_probe(&vesafb_driver, vesafb_probe); |
502 | if (ret) |
503 | platform_device_del(vesafb_device); |
504 | } |
505 | |
506 | if (ret) { |
507 | platform_device_put(vesafb_device); |
508 | vesafb_device = NULL; |
509 | } |
510 | |
511 | return ret; |
512 | } |
513 | module_init(vesafb_init); |
514 | |
515 | MODULE_LICENSE("GPL"); |
516 |
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