Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/drivers/video/68328fb.c -- Low level implementation of the | |
3 | * mc68x328 LCD frame buffer device | |
4 | * | |
5 | * Copyright (C) 2003 Georges Menie | |
6 | * | |
7 | * This driver assumes an already configured controller (e.g. from config.c) | |
8 | * Keep the code clean of board specific initialization. | |
9 | * | |
10 | * This code has not been tested with colors, colormap management functions | |
11 | * are minimal (no colormap data written to the 68328 registers...) | |
12 | * | |
13 | * initial version of this driver: | |
14 | * Copyright (C) 1998,1999 Kenneth Albanowski <kjahds@kjahds.com>, | |
15 | * The Silver Hammer Group, Ltd. | |
16 | * | |
17 | * this version is based on : | |
18 | * | |
19 | * linux/drivers/video/vfb.c -- Virtual frame buffer device | |
20 | * | |
21 | * Copyright (C) 2002 James Simmons | |
22 | * | |
23 | * Copyright (C) 1997 Geert Uytterhoeven | |
24 | * | |
25 | * This file is subject to the terms and conditions of the GNU General Public | |
26 | * License. See the file COPYING in the main directory of this archive for | |
27 | * more details. | |
28 | */ | |
29 | ||
30 | #include <linux/module.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/string.h> | |
34 | #include <linux/mm.h> | |
1da177e4 LT |
35 | #include <linux/vmalloc.h> |
36 | #include <linux/delay.h> | |
37 | #include <linux/interrupt.h> | |
38 | #include <asm/uaccess.h> | |
39 | #include <linux/fb.h> | |
40 | #include <linux/init.h> | |
41 | ||
42 | #if defined(CONFIG_M68VZ328) | |
43 | #include <asm/MC68VZ328.h> | |
44 | #elif defined(CONFIG_M68EZ328) | |
45 | #include <asm/MC68EZ328.h> | |
46 | #elif defined(CONFIG_M68328) | |
47 | #include <asm/MC68328.h> | |
48 | #else | |
49 | #error wrong architecture for the MC68x328 frame buffer device | |
50 | #endif | |
51 | ||
1da177e4 LT |
52 | static u_long videomemory; |
53 | static u_long videomemorysize; | |
54 | ||
55 | static struct fb_info fb_info; | |
5a17759c | 56 | static u32 mc68x328fb_pseudo_palette[16]; |
1da177e4 LT |
57 | |
58 | static struct fb_var_screeninfo mc68x328fb_default __initdata = { | |
59 | .red = { 0, 8, 0 }, | |
60 | .green = { 0, 8, 0 }, | |
61 | .blue = { 0, 8, 0 }, | |
62 | .activate = FB_ACTIVATE_TEST, | |
63 | .height = -1, | |
64 | .width = -1, | |
65 | .pixclock = 20000, | |
66 | .left_margin = 64, | |
67 | .right_margin = 64, | |
68 | .upper_margin = 32, | |
69 | .lower_margin = 32, | |
70 | .hsync_len = 64, | |
71 | .vsync_len = 2, | |
72 | .vmode = FB_VMODE_NONINTERLACED, | |
73 | }; | |
74 | ||
75 | static struct fb_fix_screeninfo mc68x328fb_fix __initdata = { | |
76 | .id = "68328fb", | |
77 | .type = FB_TYPE_PACKED_PIXELS, | |
78 | .xpanstep = 1, | |
79 | .ypanstep = 1, | |
80 | .ywrapstep = 1, | |
81 | .accel = FB_ACCEL_NONE, | |
82 | }; | |
83 | ||
84 | /* | |
85 | * Interface used by the world | |
86 | */ | |
87 | int mc68x328fb_init(void); | |
88 | int mc68x328fb_setup(char *); | |
89 | ||
90 | static int mc68x328fb_check_var(struct fb_var_screeninfo *var, | |
91 | struct fb_info *info); | |
92 | static int mc68x328fb_set_par(struct fb_info *info); | |
93 | static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, | |
94 | u_int transp, struct fb_info *info); | |
95 | static int mc68x328fb_pan_display(struct fb_var_screeninfo *var, | |
96 | struct fb_info *info); | |
216d526c | 97 | static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma); |
1da177e4 LT |
98 | |
99 | static struct fb_ops mc68x328fb_ops = { | |
100 | .fb_check_var = mc68x328fb_check_var, | |
101 | .fb_set_par = mc68x328fb_set_par, | |
102 | .fb_setcolreg = mc68x328fb_setcolreg, | |
103 | .fb_pan_display = mc68x328fb_pan_display, | |
104 | .fb_fillrect = cfb_fillrect, | |
105 | .fb_copyarea = cfb_copyarea, | |
106 | .fb_imageblit = cfb_imageblit, | |
1da177e4 LT |
107 | .fb_mmap = mc68x328fb_mmap, |
108 | }; | |
109 | ||
110 | /* | |
111 | * Internal routines | |
112 | */ | |
113 | ||
114 | static u_long get_line_length(int xres_virtual, int bpp) | |
115 | { | |
116 | u_long length; | |
117 | ||
118 | length = xres_virtual * bpp; | |
119 | length = (length + 31) & ~31; | |
120 | length >>= 3; | |
121 | return (length); | |
122 | } | |
123 | ||
124 | /* | |
125 | * Setting the video mode has been split into two parts. | |
126 | * First part, xxxfb_check_var, must not write anything | |
127 | * to hardware, it should only verify and adjust var. | |
128 | * This means it doesn't alter par but it does use hardware | |
129 | * data from it to check this var. | |
130 | */ | |
131 | ||
132 | static int mc68x328fb_check_var(struct fb_var_screeninfo *var, | |
133 | struct fb_info *info) | |
134 | { | |
135 | u_long line_length; | |
136 | ||
137 | /* | |
138 | * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal! | |
139 | * as FB_VMODE_SMOOTH_XPAN is only used internally | |
140 | */ | |
141 | ||
142 | if (var->vmode & FB_VMODE_CONUPDATE) { | |
143 | var->vmode |= FB_VMODE_YWRAP; | |
144 | var->xoffset = info->var.xoffset; | |
145 | var->yoffset = info->var.yoffset; | |
146 | } | |
147 | ||
148 | /* | |
149 | * Some very basic checks | |
150 | */ | |
151 | if (!var->xres) | |
152 | var->xres = 1; | |
153 | if (!var->yres) | |
154 | var->yres = 1; | |
155 | if (var->xres > var->xres_virtual) | |
156 | var->xres_virtual = var->xres; | |
157 | if (var->yres > var->yres_virtual) | |
158 | var->yres_virtual = var->yres; | |
159 | if (var->bits_per_pixel <= 1) | |
160 | var->bits_per_pixel = 1; | |
161 | else if (var->bits_per_pixel <= 8) | |
162 | var->bits_per_pixel = 8; | |
163 | else if (var->bits_per_pixel <= 16) | |
164 | var->bits_per_pixel = 16; | |
165 | else if (var->bits_per_pixel <= 24) | |
166 | var->bits_per_pixel = 24; | |
167 | else if (var->bits_per_pixel <= 32) | |
168 | var->bits_per_pixel = 32; | |
169 | else | |
170 | return -EINVAL; | |
171 | ||
172 | if (var->xres_virtual < var->xoffset + var->xres) | |
173 | var->xres_virtual = var->xoffset + var->xres; | |
174 | if (var->yres_virtual < var->yoffset + var->yres) | |
175 | var->yres_virtual = var->yoffset + var->yres; | |
176 | ||
177 | /* | |
178 | * Memory limit | |
179 | */ | |
180 | line_length = | |
181 | get_line_length(var->xres_virtual, var->bits_per_pixel); | |
182 | if (line_length * var->yres_virtual > videomemorysize) | |
183 | return -ENOMEM; | |
184 | ||
185 | /* | |
186 | * Now that we checked it we alter var. The reason being is that the video | |
187 | * mode passed in might not work but slight changes to it might make it | |
188 | * work. This way we let the user know what is acceptable. | |
189 | */ | |
190 | switch (var->bits_per_pixel) { | |
191 | case 1: | |
192 | var->red.offset = 0; | |
193 | var->red.length = 1; | |
194 | var->green.offset = 0; | |
195 | var->green.length = 1; | |
196 | var->blue.offset = 0; | |
197 | var->blue.length = 1; | |
198 | var->transp.offset = 0; | |
199 | var->transp.length = 0; | |
200 | break; | |
201 | case 8: | |
202 | var->red.offset = 0; | |
203 | var->red.length = 8; | |
204 | var->green.offset = 0; | |
205 | var->green.length = 8; | |
206 | var->blue.offset = 0; | |
207 | var->blue.length = 8; | |
208 | var->transp.offset = 0; | |
209 | var->transp.length = 0; | |
210 | break; | |
211 | case 16: /* RGBA 5551 */ | |
212 | if (var->transp.length) { | |
213 | var->red.offset = 0; | |
214 | var->red.length = 5; | |
215 | var->green.offset = 5; | |
216 | var->green.length = 5; | |
217 | var->blue.offset = 10; | |
218 | var->blue.length = 5; | |
219 | var->transp.offset = 15; | |
220 | var->transp.length = 1; | |
221 | } else { /* RGB 565 */ | |
222 | var->red.offset = 0; | |
223 | var->red.length = 5; | |
224 | var->green.offset = 5; | |
225 | var->green.length = 6; | |
226 | var->blue.offset = 11; | |
227 | var->blue.length = 5; | |
228 | var->transp.offset = 0; | |
229 | var->transp.length = 0; | |
230 | } | |
231 | break; | |
232 | case 24: /* RGB 888 */ | |
233 | var->red.offset = 0; | |
234 | var->red.length = 8; | |
235 | var->green.offset = 8; | |
236 | var->green.length = 8; | |
237 | var->blue.offset = 16; | |
238 | var->blue.length = 8; | |
239 | var->transp.offset = 0; | |
240 | var->transp.length = 0; | |
241 | break; | |
242 | case 32: /* RGBA 8888 */ | |
243 | var->red.offset = 0; | |
244 | var->red.length = 8; | |
245 | var->green.offset = 8; | |
246 | var->green.length = 8; | |
247 | var->blue.offset = 16; | |
248 | var->blue.length = 8; | |
249 | var->transp.offset = 24; | |
250 | var->transp.length = 8; | |
251 | break; | |
252 | } | |
253 | var->red.msb_right = 0; | |
254 | var->green.msb_right = 0; | |
255 | var->blue.msb_right = 0; | |
256 | var->transp.msb_right = 0; | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | /* This routine actually sets the video mode. It's in here where we | |
262 | * the hardware state info->par and fix which can be affected by the | |
263 | * change in par. For this driver it doesn't do much. | |
264 | */ | |
265 | static int mc68x328fb_set_par(struct fb_info *info) | |
266 | { | |
267 | info->fix.line_length = get_line_length(info->var.xres_virtual, | |
268 | info->var.bits_per_pixel); | |
269 | return 0; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Set a single color register. The values supplied are already | |
274 | * rounded down to the hardware's capabilities (according to the | |
275 | * entries in the var structure). Return != 0 for invalid regno. | |
276 | */ | |
277 | ||
278 | static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, | |
279 | u_int transp, struct fb_info *info) | |
280 | { | |
281 | if (regno >= 256) /* no. of hw registers */ | |
282 | return 1; | |
283 | /* | |
284 | * Program hardware... do anything you want with transp | |
285 | */ | |
286 | ||
287 | /* grayscale works only partially under directcolor */ | |
288 | if (info->var.grayscale) { | |
289 | /* grayscale = 0.30*R + 0.59*G + 0.11*B */ | |
290 | red = green = blue = | |
291 | (red * 77 + green * 151 + blue * 28) >> 8; | |
292 | } | |
293 | ||
294 | /* Directcolor: | |
295 | * var->{color}.offset contains start of bitfield | |
296 | * var->{color}.length contains length of bitfield | |
297 | * {hardwarespecific} contains width of RAMDAC | |
298 | * cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset) | |
299 | * RAMDAC[X] is programmed to (red, green, blue) | |
300 | * | |
301 | * Pseudocolor: | |
302 | * uses offset = 0 && length = RAMDAC register width. | |
303 | * var->{color}.offset is 0 | |
551e378c | 304 | * var->{color}.length contains width of DAC |
1da177e4 LT |
305 | * cmap is not used |
306 | * RAMDAC[X] is programmed to (red, green, blue) | |
307 | * Truecolor: | |
308 | * does not use DAC. Usually 3 are present. | |
309 | * var->{color}.offset contains start of bitfield | |
310 | * var->{color}.length contains length of bitfield | |
311 | * cmap is programmed to (red << red.offset) | (green << green.offset) | | |
312 | * (blue << blue.offset) | (transp << transp.offset) | |
313 | * RAMDAC does not exist | |
314 | */ | |
315 | #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16) | |
316 | switch (info->fix.visual) { | |
317 | case FB_VISUAL_TRUECOLOR: | |
318 | case FB_VISUAL_PSEUDOCOLOR: | |
319 | red = CNVT_TOHW(red, info->var.red.length); | |
320 | green = CNVT_TOHW(green, info->var.green.length); | |
321 | blue = CNVT_TOHW(blue, info->var.blue.length); | |
322 | transp = CNVT_TOHW(transp, info->var.transp.length); | |
323 | break; | |
324 | case FB_VISUAL_DIRECTCOLOR: | |
325 | red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */ | |
326 | green = CNVT_TOHW(green, 8); | |
327 | blue = CNVT_TOHW(blue, 8); | |
328 | /* hey, there is bug in transp handling... */ | |
329 | transp = CNVT_TOHW(transp, 8); | |
330 | break; | |
331 | } | |
332 | #undef CNVT_TOHW | |
333 | /* Truecolor has hardware independent palette */ | |
334 | if (info->fix.visual == FB_VISUAL_TRUECOLOR) { | |
335 | u32 v; | |
336 | ||
337 | if (regno >= 16) | |
338 | return 1; | |
339 | ||
340 | v = (red << info->var.red.offset) | | |
341 | (green << info->var.green.offset) | | |
342 | (blue << info->var.blue.offset) | | |
343 | (transp << info->var.transp.offset); | |
344 | switch (info->var.bits_per_pixel) { | |
345 | case 8: | |
346 | break; | |
347 | case 16: | |
348 | ((u32 *) (info->pseudo_palette))[regno] = v; | |
349 | break; | |
350 | case 24: | |
351 | case 32: | |
352 | ((u32 *) (info->pseudo_palette))[regno] = v; | |
353 | break; | |
354 | } | |
355 | return 0; | |
356 | } | |
357 | return 0; | |
358 | } | |
359 | ||
360 | /* | |
361 | * Pan or Wrap the Display | |
362 | * | |
363 | * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag | |
364 | */ | |
365 | ||
366 | static int mc68x328fb_pan_display(struct fb_var_screeninfo *var, | |
367 | struct fb_info *info) | |
368 | { | |
369 | if (var->vmode & FB_VMODE_YWRAP) { | |
370 | if (var->yoffset < 0 | |
371 | || var->yoffset >= info->var.yres_virtual | |
372 | || var->xoffset) | |
373 | return -EINVAL; | |
374 | } else { | |
2e1e5979 LP |
375 | if (var->xoffset + info->var.xres > info->var.xres_virtual || |
376 | var->yoffset + info->var.yres > info->var.yres_virtual) | |
1da177e4 LT |
377 | return -EINVAL; |
378 | } | |
379 | info->var.xoffset = var->xoffset; | |
380 | info->var.yoffset = var->yoffset; | |
381 | if (var->vmode & FB_VMODE_YWRAP) | |
382 | info->var.vmode |= FB_VMODE_YWRAP; | |
383 | else | |
384 | info->var.vmode &= ~FB_VMODE_YWRAP; | |
385 | return 0; | |
386 | } | |
387 | ||
388 | /* | |
389 | * Most drivers don't need their own mmap function | |
390 | */ | |
391 | ||
216d526c | 392 | static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma) |
1da177e4 LT |
393 | { |
394 | #ifndef MMU | |
395 | /* this is uClinux (no MMU) specific code */ | |
396 | ||
314e51b9 | 397 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
1da177e4 LT |
398 | vma->vm_start = videomemory; |
399 | ||
400 | return 0; | |
401 | #else | |
402 | return -EINVAL; | |
403 | #endif | |
404 | } | |
405 | ||
406 | int __init mc68x328fb_setup(char *options) | |
407 | { | |
408 | #if 0 | |
409 | char *this_opt; | |
410 | #endif | |
411 | ||
412 | if (!options || !*options) | |
413 | return 1; | |
414 | #if 0 | |
415 | while ((this_opt = strsep(&options, ",")) != NULL) { | |
416 | if (!*this_opt) | |
417 | continue; | |
418 | if (!strncmp(this_opt, "disable", 7)) | |
419 | mc68x328fb_enable = 0; | |
420 | } | |
421 | #endif | |
422 | return 1; | |
423 | } | |
424 | ||
425 | /* | |
426 | * Initialisation | |
427 | */ | |
428 | ||
429 | int __init mc68x328fb_init(void) | |
430 | { | |
431 | #ifndef MODULE | |
432 | char *option = NULL; | |
433 | ||
434 | if (fb_get_options("68328fb", &option)) | |
435 | return -ENODEV; | |
436 | mc68x328fb_setup(option); | |
437 | #endif | |
438 | /* | |
439 | * initialize the default mode from the LCD controller registers | |
440 | */ | |
441 | mc68x328fb_default.xres = LXMAX; | |
442 | mc68x328fb_default.yres = LYMAX+1; | |
443 | mc68x328fb_default.xres_virtual = mc68x328fb_default.xres; | |
444 | mc68x328fb_default.yres_virtual = mc68x328fb_default.yres; | |
445 | mc68x328fb_default.bits_per_pixel = 1 + (LPICF & 0x01); | |
446 | videomemory = LSSA; | |
447 | videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 * | |
448 | mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel; | |
449 | ||
450 | fb_info.screen_base = (void *)videomemory; | |
451 | fb_info.fbops = &mc68x328fb_ops; | |
452 | fb_info.var = mc68x328fb_default; | |
453 | fb_info.fix = mc68x328fb_fix; | |
454 | fb_info.fix.smem_start = videomemory; | |
455 | fb_info.fix.smem_len = videomemorysize; | |
456 | fb_info.fix.line_length = | |
457 | get_line_length(mc68x328fb_default.xres_virtual, mc68x328fb_default.bits_per_pixel); | |
458 | fb_info.fix.visual = (mc68x328fb_default.bits_per_pixel) == 1 ? | |
8c5a6d83 | 459 | FB_VISUAL_MONO10 : FB_VISUAL_PSEUDOCOLOR; |
1da177e4 LT |
460 | if (fb_info.var.bits_per_pixel == 1) { |
461 | fb_info.var.red.length = fb_info.var.green.length = fb_info.var.blue.length = 1; | |
462 | fb_info.var.red.offset = fb_info.var.green.offset = fb_info.var.blue.offset = 0; | |
463 | } | |
464 | fb_info.pseudo_palette = &mc68x328fb_pseudo_palette; | |
465 | fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN; | |
466 | ||
e98d9b40 AS |
467 | if (fb_alloc_cmap(&fb_info.cmap, 256, 0)) |
468 | return -ENOMEM; | |
1da177e4 LT |
469 | |
470 | if (register_framebuffer(&fb_info) < 0) { | |
e98d9b40 | 471 | fb_dealloc_cmap(&fb_info.cmap); |
1da177e4 LT |
472 | return -EINVAL; |
473 | } | |
474 | ||
31b6780c JP |
475 | fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id); |
476 | fb_info(&fb_info, "%dx%dx%d at 0x%08lx\n", | |
477 | mc68x328fb_default.xres_virtual, | |
478 | mc68x328fb_default.yres_virtual, | |
1da177e4 LT |
479 | 1 << mc68x328fb_default.bits_per_pixel, videomemory); |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | module_init(mc68x328fb_init); | |
485 | ||
486 | #ifdef MODULE | |
487 | ||
488 | static void __exit mc68x328fb_cleanup(void) | |
489 | { | |
490 | unregister_framebuffer(&fb_info); | |
e98d9b40 | 491 | fb_dealloc_cmap(&fb_info.cmap); |
1da177e4 LT |
492 | } |
493 | ||
494 | module_exit(mc68x328fb_cleanup); | |
495 | ||
496 | MODULE_LICENSE("GPL"); | |
497 | #endif /* MODULE */ |