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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 | ||
52 | #if defined(CONFIG_FB_68328_INVERT) | |
53 | #define MC68X328FB_MONO_VISUAL FB_VISUAL_MONO01 | |
54 | #else | |
55 | #define MC68X328FB_MONO_VISUAL FB_VISUAL_MONO10 | |
56 | #endif | |
57 | ||
58 | static u_long videomemory; | |
59 | static u_long videomemorysize; | |
60 | ||
61 | static struct fb_info fb_info; | |
5a17759c | 62 | static u32 mc68x328fb_pseudo_palette[16]; |
1da177e4 LT |
63 | |
64 | static struct fb_var_screeninfo mc68x328fb_default __initdata = { | |
65 | .red = { 0, 8, 0 }, | |
66 | .green = { 0, 8, 0 }, | |
67 | .blue = { 0, 8, 0 }, | |
68 | .activate = FB_ACTIVATE_TEST, | |
69 | .height = -1, | |
70 | .width = -1, | |
71 | .pixclock = 20000, | |
72 | .left_margin = 64, | |
73 | .right_margin = 64, | |
74 | .upper_margin = 32, | |
75 | .lower_margin = 32, | |
76 | .hsync_len = 64, | |
77 | .vsync_len = 2, | |
78 | .vmode = FB_VMODE_NONINTERLACED, | |
79 | }; | |
80 | ||
81 | static struct fb_fix_screeninfo mc68x328fb_fix __initdata = { | |
82 | .id = "68328fb", | |
83 | .type = FB_TYPE_PACKED_PIXELS, | |
84 | .xpanstep = 1, | |
85 | .ypanstep = 1, | |
86 | .ywrapstep = 1, | |
87 | .accel = FB_ACCEL_NONE, | |
88 | }; | |
89 | ||
90 | /* | |
91 | * Interface used by the world | |
92 | */ | |
93 | int mc68x328fb_init(void); | |
94 | int mc68x328fb_setup(char *); | |
95 | ||
96 | static int mc68x328fb_check_var(struct fb_var_screeninfo *var, | |
97 | struct fb_info *info); | |
98 | static int mc68x328fb_set_par(struct fb_info *info); | |
99 | static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, | |
100 | u_int transp, struct fb_info *info); | |
101 | static int mc68x328fb_pan_display(struct fb_var_screeninfo *var, | |
102 | struct fb_info *info); | |
216d526c | 103 | static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma); |
1da177e4 LT |
104 | |
105 | static struct fb_ops mc68x328fb_ops = { | |
106 | .fb_check_var = mc68x328fb_check_var, | |
107 | .fb_set_par = mc68x328fb_set_par, | |
108 | .fb_setcolreg = mc68x328fb_setcolreg, | |
109 | .fb_pan_display = mc68x328fb_pan_display, | |
110 | .fb_fillrect = cfb_fillrect, | |
111 | .fb_copyarea = cfb_copyarea, | |
112 | .fb_imageblit = cfb_imageblit, | |
1da177e4 LT |
113 | .fb_mmap = mc68x328fb_mmap, |
114 | }; | |
115 | ||
116 | /* | |
117 | * Internal routines | |
118 | */ | |
119 | ||
120 | static u_long get_line_length(int xres_virtual, int bpp) | |
121 | { | |
122 | u_long length; | |
123 | ||
124 | length = xres_virtual * bpp; | |
125 | length = (length + 31) & ~31; | |
126 | length >>= 3; | |
127 | return (length); | |
128 | } | |
129 | ||
130 | /* | |
131 | * Setting the video mode has been split into two parts. | |
132 | * First part, xxxfb_check_var, must not write anything | |
133 | * to hardware, it should only verify and adjust var. | |
134 | * This means it doesn't alter par but it does use hardware | |
135 | * data from it to check this var. | |
136 | */ | |
137 | ||
138 | static int mc68x328fb_check_var(struct fb_var_screeninfo *var, | |
139 | struct fb_info *info) | |
140 | { | |
141 | u_long line_length; | |
142 | ||
143 | /* | |
144 | * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal! | |
145 | * as FB_VMODE_SMOOTH_XPAN is only used internally | |
146 | */ | |
147 | ||
148 | if (var->vmode & FB_VMODE_CONUPDATE) { | |
149 | var->vmode |= FB_VMODE_YWRAP; | |
150 | var->xoffset = info->var.xoffset; | |
151 | var->yoffset = info->var.yoffset; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Some very basic checks | |
156 | */ | |
157 | if (!var->xres) | |
158 | var->xres = 1; | |
159 | if (!var->yres) | |
160 | var->yres = 1; | |
161 | if (var->xres > var->xres_virtual) | |
162 | var->xres_virtual = var->xres; | |
163 | if (var->yres > var->yres_virtual) | |
164 | var->yres_virtual = var->yres; | |
165 | if (var->bits_per_pixel <= 1) | |
166 | var->bits_per_pixel = 1; | |
167 | else if (var->bits_per_pixel <= 8) | |
168 | var->bits_per_pixel = 8; | |
169 | else if (var->bits_per_pixel <= 16) | |
170 | var->bits_per_pixel = 16; | |
171 | else if (var->bits_per_pixel <= 24) | |
172 | var->bits_per_pixel = 24; | |
173 | else if (var->bits_per_pixel <= 32) | |
174 | var->bits_per_pixel = 32; | |
175 | else | |
176 | return -EINVAL; | |
177 | ||
178 | if (var->xres_virtual < var->xoffset + var->xres) | |
179 | var->xres_virtual = var->xoffset + var->xres; | |
180 | if (var->yres_virtual < var->yoffset + var->yres) | |
181 | var->yres_virtual = var->yoffset + var->yres; | |
182 | ||
183 | /* | |
184 | * Memory limit | |
185 | */ | |
186 | line_length = | |
187 | get_line_length(var->xres_virtual, var->bits_per_pixel); | |
188 | if (line_length * var->yres_virtual > videomemorysize) | |
189 | return -ENOMEM; | |
190 | ||
191 | /* | |
192 | * Now that we checked it we alter var. The reason being is that the video | |
193 | * mode passed in might not work but slight changes to it might make it | |
194 | * work. This way we let the user know what is acceptable. | |
195 | */ | |
196 | switch (var->bits_per_pixel) { | |
197 | case 1: | |
198 | var->red.offset = 0; | |
199 | var->red.length = 1; | |
200 | var->green.offset = 0; | |
201 | var->green.length = 1; | |
202 | var->blue.offset = 0; | |
203 | var->blue.length = 1; | |
204 | var->transp.offset = 0; | |
205 | var->transp.length = 0; | |
206 | break; | |
207 | case 8: | |
208 | var->red.offset = 0; | |
209 | var->red.length = 8; | |
210 | var->green.offset = 0; | |
211 | var->green.length = 8; | |
212 | var->blue.offset = 0; | |
213 | var->blue.length = 8; | |
214 | var->transp.offset = 0; | |
215 | var->transp.length = 0; | |
216 | break; | |
217 | case 16: /* RGBA 5551 */ | |
218 | if (var->transp.length) { | |
219 | var->red.offset = 0; | |
220 | var->red.length = 5; | |
221 | var->green.offset = 5; | |
222 | var->green.length = 5; | |
223 | var->blue.offset = 10; | |
224 | var->blue.length = 5; | |
225 | var->transp.offset = 15; | |
226 | var->transp.length = 1; | |
227 | } else { /* RGB 565 */ | |
228 | var->red.offset = 0; | |
229 | var->red.length = 5; | |
230 | var->green.offset = 5; | |
231 | var->green.length = 6; | |
232 | var->blue.offset = 11; | |
233 | var->blue.length = 5; | |
234 | var->transp.offset = 0; | |
235 | var->transp.length = 0; | |
236 | } | |
237 | break; | |
238 | case 24: /* RGB 888 */ | |
239 | var->red.offset = 0; | |
240 | var->red.length = 8; | |
241 | var->green.offset = 8; | |
242 | var->green.length = 8; | |
243 | var->blue.offset = 16; | |
244 | var->blue.length = 8; | |
245 | var->transp.offset = 0; | |
246 | var->transp.length = 0; | |
247 | break; | |
248 | case 32: /* RGBA 8888 */ | |
249 | var->red.offset = 0; | |
250 | var->red.length = 8; | |
251 | var->green.offset = 8; | |
252 | var->green.length = 8; | |
253 | var->blue.offset = 16; | |
254 | var->blue.length = 8; | |
255 | var->transp.offset = 24; | |
256 | var->transp.length = 8; | |
257 | break; | |
258 | } | |
259 | var->red.msb_right = 0; | |
260 | var->green.msb_right = 0; | |
261 | var->blue.msb_right = 0; | |
262 | var->transp.msb_right = 0; | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | /* This routine actually sets the video mode. It's in here where we | |
268 | * the hardware state info->par and fix which can be affected by the | |
269 | * change in par. For this driver it doesn't do much. | |
270 | */ | |
271 | static int mc68x328fb_set_par(struct fb_info *info) | |
272 | { | |
273 | info->fix.line_length = get_line_length(info->var.xres_virtual, | |
274 | info->var.bits_per_pixel); | |
275 | return 0; | |
276 | } | |
277 | ||
278 | /* | |
279 | * Set a single color register. The values supplied are already | |
280 | * rounded down to the hardware's capabilities (according to the | |
281 | * entries in the var structure). Return != 0 for invalid regno. | |
282 | */ | |
283 | ||
284 | static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, | |
285 | u_int transp, struct fb_info *info) | |
286 | { | |
287 | if (regno >= 256) /* no. of hw registers */ | |
288 | return 1; | |
289 | /* | |
290 | * Program hardware... do anything you want with transp | |
291 | */ | |
292 | ||
293 | /* grayscale works only partially under directcolor */ | |
294 | if (info->var.grayscale) { | |
295 | /* grayscale = 0.30*R + 0.59*G + 0.11*B */ | |
296 | red = green = blue = | |
297 | (red * 77 + green * 151 + blue * 28) >> 8; | |
298 | } | |
299 | ||
300 | /* Directcolor: | |
301 | * var->{color}.offset contains start of bitfield | |
302 | * var->{color}.length contains length of bitfield | |
303 | * {hardwarespecific} contains width of RAMDAC | |
304 | * cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset) | |
305 | * RAMDAC[X] is programmed to (red, green, blue) | |
306 | * | |
307 | * Pseudocolor: | |
308 | * uses offset = 0 && length = RAMDAC register width. | |
309 | * var->{color}.offset is 0 | |
551e378c | 310 | * var->{color}.length contains width of DAC |
1da177e4 LT |
311 | * cmap is not used |
312 | * RAMDAC[X] is programmed to (red, green, blue) | |
313 | * Truecolor: | |
314 | * does not use DAC. Usually 3 are present. | |
315 | * var->{color}.offset contains start of bitfield | |
316 | * var->{color}.length contains length of bitfield | |
317 | * cmap is programmed to (red << red.offset) | (green << green.offset) | | |
318 | * (blue << blue.offset) | (transp << transp.offset) | |
319 | * RAMDAC does not exist | |
320 | */ | |
321 | #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16) | |
322 | switch (info->fix.visual) { | |
323 | case FB_VISUAL_TRUECOLOR: | |
324 | case FB_VISUAL_PSEUDOCOLOR: | |
325 | red = CNVT_TOHW(red, info->var.red.length); | |
326 | green = CNVT_TOHW(green, info->var.green.length); | |
327 | blue = CNVT_TOHW(blue, info->var.blue.length); | |
328 | transp = CNVT_TOHW(transp, info->var.transp.length); | |
329 | break; | |
330 | case FB_VISUAL_DIRECTCOLOR: | |
331 | red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */ | |
332 | green = CNVT_TOHW(green, 8); | |
333 | blue = CNVT_TOHW(blue, 8); | |
334 | /* hey, there is bug in transp handling... */ | |
335 | transp = CNVT_TOHW(transp, 8); | |
336 | break; | |
337 | } | |
338 | #undef CNVT_TOHW | |
339 | /* Truecolor has hardware independent palette */ | |
340 | if (info->fix.visual == FB_VISUAL_TRUECOLOR) { | |
341 | u32 v; | |
342 | ||
343 | if (regno >= 16) | |
344 | return 1; | |
345 | ||
346 | v = (red << info->var.red.offset) | | |
347 | (green << info->var.green.offset) | | |
348 | (blue << info->var.blue.offset) | | |
349 | (transp << info->var.transp.offset); | |
350 | switch (info->var.bits_per_pixel) { | |
351 | case 8: | |
352 | break; | |
353 | case 16: | |
354 | ((u32 *) (info->pseudo_palette))[regno] = v; | |
355 | break; | |
356 | case 24: | |
357 | case 32: | |
358 | ((u32 *) (info->pseudo_palette))[regno] = v; | |
359 | break; | |
360 | } | |
361 | return 0; | |
362 | } | |
363 | return 0; | |
364 | } | |
365 | ||
366 | /* | |
367 | * Pan or Wrap the Display | |
368 | * | |
369 | * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag | |
370 | */ | |
371 | ||
372 | static int mc68x328fb_pan_display(struct fb_var_screeninfo *var, | |
373 | struct fb_info *info) | |
374 | { | |
375 | if (var->vmode & FB_VMODE_YWRAP) { | |
376 | if (var->yoffset < 0 | |
377 | || var->yoffset >= info->var.yres_virtual | |
378 | || var->xoffset) | |
379 | return -EINVAL; | |
380 | } else { | |
2e1e5979 LP |
381 | if (var->xoffset + info->var.xres > info->var.xres_virtual || |
382 | var->yoffset + info->var.yres > info->var.yres_virtual) | |
1da177e4 LT |
383 | return -EINVAL; |
384 | } | |
385 | info->var.xoffset = var->xoffset; | |
386 | info->var.yoffset = var->yoffset; | |
387 | if (var->vmode & FB_VMODE_YWRAP) | |
388 | info->var.vmode |= FB_VMODE_YWRAP; | |
389 | else | |
390 | info->var.vmode &= ~FB_VMODE_YWRAP; | |
391 | return 0; | |
392 | } | |
393 | ||
394 | /* | |
395 | * Most drivers don't need their own mmap function | |
396 | */ | |
397 | ||
216d526c | 398 | static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma) |
1da177e4 LT |
399 | { |
400 | #ifndef MMU | |
401 | /* this is uClinux (no MMU) specific code */ | |
402 | ||
403 | vma->vm_flags |= VM_RESERVED; | |
404 | vma->vm_start = videomemory; | |
405 | ||
406 | return 0; | |
407 | #else | |
408 | return -EINVAL; | |
409 | #endif | |
410 | } | |
411 | ||
412 | int __init mc68x328fb_setup(char *options) | |
413 | { | |
414 | #if 0 | |
415 | char *this_opt; | |
416 | #endif | |
417 | ||
418 | if (!options || !*options) | |
419 | return 1; | |
420 | #if 0 | |
421 | while ((this_opt = strsep(&options, ",")) != NULL) { | |
422 | if (!*this_opt) | |
423 | continue; | |
424 | if (!strncmp(this_opt, "disable", 7)) | |
425 | mc68x328fb_enable = 0; | |
426 | } | |
427 | #endif | |
428 | return 1; | |
429 | } | |
430 | ||
431 | /* | |
432 | * Initialisation | |
433 | */ | |
434 | ||
435 | int __init mc68x328fb_init(void) | |
436 | { | |
437 | #ifndef MODULE | |
438 | char *option = NULL; | |
439 | ||
440 | if (fb_get_options("68328fb", &option)) | |
441 | return -ENODEV; | |
442 | mc68x328fb_setup(option); | |
443 | #endif | |
444 | /* | |
445 | * initialize the default mode from the LCD controller registers | |
446 | */ | |
447 | mc68x328fb_default.xres = LXMAX; | |
448 | mc68x328fb_default.yres = LYMAX+1; | |
449 | mc68x328fb_default.xres_virtual = mc68x328fb_default.xres; | |
450 | mc68x328fb_default.yres_virtual = mc68x328fb_default.yres; | |
451 | mc68x328fb_default.bits_per_pixel = 1 + (LPICF & 0x01); | |
452 | videomemory = LSSA; | |
453 | videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 * | |
454 | mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel; | |
455 | ||
456 | fb_info.screen_base = (void *)videomemory; | |
457 | fb_info.fbops = &mc68x328fb_ops; | |
458 | fb_info.var = mc68x328fb_default; | |
459 | fb_info.fix = mc68x328fb_fix; | |
460 | fb_info.fix.smem_start = videomemory; | |
461 | fb_info.fix.smem_len = videomemorysize; | |
462 | fb_info.fix.line_length = | |
463 | get_line_length(mc68x328fb_default.xres_virtual, mc68x328fb_default.bits_per_pixel); | |
464 | fb_info.fix.visual = (mc68x328fb_default.bits_per_pixel) == 1 ? | |
465 | MC68X328FB_MONO_VISUAL : FB_VISUAL_PSEUDOCOLOR; | |
466 | if (fb_info.var.bits_per_pixel == 1) { | |
467 | fb_info.var.red.length = fb_info.var.green.length = fb_info.var.blue.length = 1; | |
468 | fb_info.var.red.offset = fb_info.var.green.offset = fb_info.var.blue.offset = 0; | |
469 | } | |
470 | fb_info.pseudo_palette = &mc68x328fb_pseudo_palette; | |
471 | fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN; | |
472 | ||
e98d9b40 AS |
473 | if (fb_alloc_cmap(&fb_info.cmap, 256, 0)) |
474 | return -ENOMEM; | |
1da177e4 LT |
475 | |
476 | if (register_framebuffer(&fb_info) < 0) { | |
e98d9b40 | 477 | fb_dealloc_cmap(&fb_info.cmap); |
1da177e4 LT |
478 | return -EINVAL; |
479 | } | |
480 | ||
481 | printk(KERN_INFO | |
482 | "fb%d: %s frame buffer device\n", fb_info.node, fb_info.fix.id); | |
483 | printk(KERN_INFO | |
484 | "fb%d: %dx%dx%d at 0x%08lx\n", fb_info.node, | |
485 | mc68x328fb_default.xres_virtual, mc68x328fb_default.yres_virtual, | |
486 | 1 << mc68x328fb_default.bits_per_pixel, videomemory); | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
491 | module_init(mc68x328fb_init); | |
492 | ||
493 | #ifdef MODULE | |
494 | ||
495 | static void __exit mc68x328fb_cleanup(void) | |
496 | { | |
497 | unregister_framebuffer(&fb_info); | |
e98d9b40 | 498 | fb_dealloc_cmap(&fb_info.cmap); |
1da177e4 LT |
499 | } |
500 | ||
501 | module_exit(mc68x328fb_cleanup); | |
502 | ||
503 | MODULE_LICENSE("GPL"); | |
504 | #endif /* MODULE */ |