fbui | Framebuffer-based graphical environment |
| download: https://git.y1.nz/archives/fbui.tar.gz | |
| README | Files | Log | Refs |
drivers/video/vesafb.c
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/tty.h>
17 #include <linux/slab.h>
18 #include <linux/delay.h>
19 #include <linux/fb.h>
20 #include <linux/ioport.h>
21 #include <linux/init.h>
22 #ifdef __i386__
23 #include <video/edid.h>
24 #endif
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 = 0;
51 static int mtrr = 1;
52 static int vram __initdata = 0; /* Set amount of memory to be used */
53 static int pmi_setpal = 0; /* pmi for palette changes ??? */
54 static int ypan = 0; /* 0..nothing, 1..ypan, 2..ywrap */
55 static unsigned short *pmi_base = NULL;
56 static void (*pmi_start)(void);
57 static void (*pmi_pal)(void);
58
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 if (!ypan)
68 return -EINVAL;
69 if (var->xoffset)
70 return -EINVAL;
71 if (var->yoffset > var->yres_virtual)
72 return -EINVAL;
73 if ((ypan==1) && var->yoffset+var->yres > var->yres_virtual)
74 return -EINVAL;
75
76 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
77
78 __asm__ __volatile__(
79 "call *(%%edi)"
80 : /* no return value */
81 : "a" (0x4f07), /* EAX */
82 "b" (0), /* EBX */
83 "c" (offset), /* ECX */
84 "d" (offset >> 16), /* EDX */
85 "D" (&pmi_start)); /* EDI */
86 #endif
87 return 0;
88 }
89
90 static void vesa_setpalette(int regno, unsigned red, unsigned green,
91 unsigned blue, struct fb_var_screeninfo *var)
92 {
93 #ifdef __i386__
94 struct { u_char blue, green, red, pad; } entry;
95 int shift = 16 - var->green.length;
96
97 if (pmi_setpal) {
98 entry.red = red >> shift;
99 entry.green = green >> shift;
100 entry.blue = blue >> shift;
101 entry.pad = 0;
102 __asm__ __volatile__(
103 "call *(%%esi)"
104 : /* no return value */
105 : "a" (0x4f09), /* EAX */
106 "b" (0), /* EBX */
107 "c" (1), /* ECX */
108 "d" (regno), /* EDX */
109 "D" (&entry), /* EDI */
110 "S" (&pmi_pal)); /* ESI */
111 } else {
112 /* without protected mode interface, try VGA registers... */
113 outb_p(regno, dac_reg);
114 outb_p(red >> shift, dac_val);
115 outb_p(green >> shift, dac_val);
116 outb_p(blue >> shift, dac_val);
117 }
118 #endif
119 }
120
121 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
122 unsigned blue, unsigned transp,
123 struct fb_info *info)
124 {
125 /*
126 * Set a single color register. The values supplied are
127 * already rounded down to the hardware's capabilities
128 * (according to the entries in the `var' structure). Return
129 * != 0 for invalid regno.
130 */
131
132 if (regno >= info->cmap.len)
133 return 1;
134
135 switch (info->var.bits_per_pixel) {
136 case 8:
137 vesa_setpalette(regno,red,green,blue, &info->var);
138 break;
139 case 16:
140 if (info->var.red.offset == 10) {
141 /* 1:5:5:5 */
142 ((u32*) (info->pseudo_palette))[regno] =
143 ((red & 0xf800) >> 1) |
144 ((green & 0xf800) >> 6) |
145 ((blue & 0xf800) >> 11);
146 } else {
147 /* 0:5:6:5 */
148 ((u32*) (info->pseudo_palette))[regno] =
149 ((red & 0xf800) ) |
150 ((green & 0xfc00) >> 5) |
151 ((blue & 0xf800) >> 11);
152 }
153 break;
154 case 24:
155 red >>= 8;
156 green >>= 8;
157 blue >>= 8;
158 ((u32 *)(info->pseudo_palette))[regno] =
159 (red << info->var.red.offset) |
160 (green << info->var.green.offset) |
161 (blue << info->var.blue.offset);
162 break;
163 case 32:
164 red >>= 8;
165 green >>= 8;
166 blue >>= 8;
167 ((u32 *)(info->pseudo_palette))[regno] =
168 (red << info->var.red.offset) |
169 (green << info->var.green.offset) |
170 (blue << info->var.blue.offset);
171 break;
172 }
173 return 0;
174 }
175
176 static struct fb_ops vesafb_ops = {
177 .owner = THIS_MODULE,
178 .fb_setcolreg = vesafb_setcolreg,
179 .fb_pan_display = vesafb_pan_display,
180 .fb_fillrect = cfb_fillrect,
181 .fb_copyarea = cfb_copyarea,
182 .fb_imageblit = cfb_imageblit,
183 .fb_cursor = soft_cursor,
184
185 #ifdef CONFIG_FB_UI
186 /* Assign routines from fbui.c */
187 .fb_release = fbui_release,
188 .fb_point = fb_point,
189 .fb_hline = fb_hline,
190 .fb_vline = fb_vline,
191 .fb_clear = fb_clear,
192 .fb_read_point = fb_read_point,
193 .fb_putpixels_native = fb_putpixels_native,
194 .fb_putpixels_rgb = fb_putpixels_rgb,
195 .fb_putpixels_rgb3 = fb_putpixels_rgb3,
196 .fb_getpixels_rgb = fb_getpixels_rgb,
197 .fb_copyarea2 = fb_copyarea,
198 #endif
199 };
200
201 int __init vesafb_setup(char *options)
202 {
203 char *this_opt;
204
205 if (!options || !*options)
206 return 0;
207
208 while ((this_opt = strsep(&options, ",")) != NULL) {
209 if (!*this_opt) continue;
210
211 if (! strcmp(this_opt, "inverse"))
212 inverse=1;
213 else if (! strcmp(this_opt, "redraw"))
214 ypan=0;
215 else if (! strcmp(this_opt, "ypan"))
216 ypan=1;
217 else if (! strcmp(this_opt, "ywrap"))
218 ypan=2;
219 else if (! strcmp(this_opt, "vgapal"))
220 pmi_setpal=0;
221 else if (! strcmp(this_opt, "pmipal"))
222 pmi_setpal=1;
223 else if (! strcmp(this_opt, "mtrr"))
224 mtrr=1;
225 else if (! strcmp(this_opt, "nomtrr"))
226 mtrr=0;
227 else if (! strncmp(this_opt, "vram:", 5))
228 vram = simple_strtoul(this_opt+5, NULL, 0);
229 }
230 return 0;
231 }
232
233 static int __init vesafb_probe(struct device *device)
234 {
235 struct platform_device *dev = to_platform_device(device);
236 struct fb_info *info;
237 int i, err;
238
239 if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
240 return -ENXIO;
241
242 vesafb_fix.smem_start = screen_info.lfb_base;
243 vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
244 if (15 == vesafb_defined.bits_per_pixel)
245 vesafb_defined.bits_per_pixel = 16;
246 vesafb_defined.xres = screen_info.lfb_width;
247 vesafb_defined.yres = screen_info.lfb_height;
248 vesafb_fix.line_length = screen_info.lfb_linelength;
249
250 /* Allocate enough memory for double buffering */
251 vesafb_fix.smem_len = screen_info.lfb_width * screen_info.lfb_height * vesafb_defined.bits_per_pixel >> 2;
252
253 /* check that we don't remap more memory than old cards have */
254 if (vesafb_fix.smem_len > (screen_info.lfb_size * 65536))
255 vesafb_fix.smem_len = screen_info.lfb_size * 65536;
256
257 /* Set video size according to vram boot option */
258 if (vram)
259 vesafb_fix.smem_len = vram * 1024 * 1024;
260
261 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ?
262 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
263
264 /* limit framebuffer size to 16 MB. Otherwise we'll eat tons of
265 * kernel address space for nothing if the gfx card has alot of
266 * memory (>= 128 MB isn't uncommon these days ...) */
267 if (vesafb_fix.smem_len > 16 * 1024 * 1024)
268 vesafb_fix.smem_len = 16 * 1024 * 1024;
269
270 #ifndef __i386__
271 screen_info.vesapm_seg = 0;
272 #endif
273
274 if (!request_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len, "vesafb")) {
275 printk(KERN_WARNING
276 "vesafb: abort, cannot reserve video memory at 0x%lx\n",
277 vesafb_fix.smem_start);
278 /* We cannot make this fatal. Sometimes this comes from magic
279 spaces our resource handlers simply don't know about */
280 }
281
282 info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
283 if (!info) {
284 release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
285 return -ENOMEM;
286 }
287 info->pseudo_palette = info->par;
288 info->par = NULL;
289
290 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
291 if (!info->screen_base) {
292 printk(KERN_ERR
293 "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
294 vesafb_fix.smem_len, vesafb_fix.smem_start);
295 err = -EIO;
296 goto err;
297 }
298
299 printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
300 vesafb_fix.smem_start, info->screen_base, vesafb_fix.smem_len/1024);
301 printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
302 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
303
304 if (screen_info.vesapm_seg) {
305 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
306 screen_info.vesapm_seg,screen_info.vesapm_off);
307 }
308
309 if (screen_info.vesapm_seg < 0xc000)
310 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
311
312 if (ypan || pmi_setpal) {
313 pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
314 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
315 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]);
316 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
317 if (pmi_base[3]) {
318 printk(KERN_INFO "vesafb: pmi: ports = ");
319 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
320 printk("%x ",pmi_base[i]);
321 printk("\n");
322 if (pmi_base[i] != 0xffff) {
323 /*
324 * memory areas not supported (yet?)
325 *
326 * Rules are: we have to set up a descriptor for the requested
327 * memory area and pass it in the ES register to the BIOS function.
328 */
329 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
330 ypan = pmi_setpal = 0;
331 }
332 }
333 }
334
335 vesafb_defined.xres_virtual = vesafb_defined.xres;
336 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
337 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
338 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
339 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
340 } else {
341 printk(KERN_INFO "vesafb: scrolling: redraw\n");
342 vesafb_defined.yres_virtual = vesafb_defined.yres;
343 ypan = 0;
344 }
345
346 /* some dummy values for timing to make fbset happy */
347 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
348 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8;
349 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8;
350
351 vesafb_defined.red.offset = screen_info.red_pos;
352 vesafb_defined.red.length = screen_info.red_size;
353 vesafb_defined.green.offset = screen_info.green_pos;
354 vesafb_defined.green.length = screen_info.green_size;
355 vesafb_defined.blue.offset = screen_info.blue_pos;
356 vesafb_defined.blue.length = screen_info.blue_size;
357 vesafb_defined.transp.offset = screen_info.rsvd_pos;
358 vesafb_defined.transp.length = screen_info.rsvd_size;
359 printk(KERN_INFO "vesafb: %s: "
360 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
361 (vesafb_defined.bits_per_pixel > 8) ?
362 "Truecolor" : "Pseudocolor",
363 screen_info.rsvd_size,
364 screen_info.red_size,
365 screen_info.green_size,
366 screen_info.blue_size,
367 screen_info.rsvd_pos,
368 screen_info.red_pos,
369 screen_info.green_pos,
370 screen_info.blue_pos);
371
372 vesafb_fix.ypanstep = ypan ? 1 : 0;
373 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
374
375 /* request failure does not faze us, as vgacon probably has this
376 * region already (FIXME) */
377 request_region(0x3c0, 32, "vesafb");
378
379 if (mtrr) {
380 int temp_size = vesafb_fix.smem_len;
381 /* Find the largest power-of-two */
382 while (temp_size & (temp_size - 1))
383 temp_size &= (temp_size - 1);
384
385 /* Try and find a power of two to add */
386 while (temp_size && mtrr_add(vesafb_fix.smem_start, temp_size, MTRR_TYPE_WRCOMB, 1)==-EINVAL) {
387 temp_size >>= 1;
388 }
389 }
390
391 info->fbops = &vesafb_ops;
392 info->var = vesafb_defined;
393 info->fix = vesafb_fix;
394 info->flags = FBINFO_FLAG_DEFAULT |
395 (ypan) ? FBINFO_HWACCEL_YPAN : 0;
396
397 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
398 err = -ENXIO;
399 goto err;
400 }
401 if (register_framebuffer(info)<0) {
402 err = -EINVAL;
403 fb_dealloc_cmap(&info->cmap);
404 goto err;
405 }
406 printk(KERN_INFO "fb%d: %s frame buffer device\n",
407 info->node, info->fix.id);
408
409 #ifdef CONFIG_FB_UI
410 fbui_init (info);
411 #endif
412
413 return 0;
414 err:
415 framebuffer_release(info);
416 release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
417 return err;
418 }
419
420 static struct device_driver vesafb_driver = {
421 .name = "vesafb",
422 .bus = &platform_bus_type,
423 .probe = vesafb_probe,
424 };
425
426 static struct platform_device vesafb_device = {
427 .name = "vesafb",
428 };
429
430 int __init vesafb_init(void)
431 {
432 int ret;
433 char *option = NULL;
434
435 /* ignore error return of fb_get_options */
436 fb_get_options("vesafb", &option);
437 vesafb_setup(option);
438 ret = driver_register(&vesafb_driver);
439
440 if (!ret) {
441 ret = platform_device_register(&vesafb_device);
442 if (ret)
443 driver_unregister(&vesafb_driver);
444 }
445 return ret;
446 }
447 module_init(vesafb_init);
448
449 /*
450 * Overrides for Emacs so that we follow Linus's tabbing style.
451 * ---------------------------------------------------------------------------
452 * Local variables:
453 * c-basic-offset: 8
454 * End:
455 */
456
457 MODULE_LICENSE("GPL");
This webpage is intended to be an accessible preview of this repository. To get a fuller picture, clone it and use the git CLI.