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Diffstat (limited to 'drivers/video/68328fb.c')
-rw-r--r--drivers/video/68328fb.c506
1 files changed, 506 insertions, 0 deletions
diff --git a/drivers/video/68328fb.c b/drivers/video/68328fb.c
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index 000000000000..6a3cfbdc6dc9
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+++ b/drivers/video/68328fb.c
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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>
35#include <linux/tty.h>
36#include <linux/slab.h>
37#include <linux/vmalloc.h>
38#include <linux/delay.h>
39#include <linux/interrupt.h>
40#include <asm/uaccess.h>
41#include <linux/fb.h>
42#include <linux/init.h>
43
44#if defined(CONFIG_M68VZ328)
45#include <asm/MC68VZ328.h>
46#elif defined(CONFIG_M68EZ328)
47#include <asm/MC68EZ328.h>
48#elif defined(CONFIG_M68328)
49#include <asm/MC68328.h>
50#else
51#error wrong architecture for the MC68x328 frame buffer device
52#endif
53
54#if defined(CONFIG_FB_68328_INVERT)
55#define MC68X328FB_MONO_VISUAL FB_VISUAL_MONO01
56#else
57#define MC68X328FB_MONO_VISUAL FB_VISUAL_MONO10
58#endif
59
60static u_long videomemory;
61static u_long videomemorysize;
62
63static struct fb_info fb_info;
64static u32 mc68x328fb_pseudo_palette[17];
65
66static struct fb_var_screeninfo mc68x328fb_default __initdata = {
67 .red = { 0, 8, 0 },
68 .green = { 0, 8, 0 },
69 .blue = { 0, 8, 0 },
70 .activate = FB_ACTIVATE_TEST,
71 .height = -1,
72 .width = -1,
73 .pixclock = 20000,
74 .left_margin = 64,
75 .right_margin = 64,
76 .upper_margin = 32,
77 .lower_margin = 32,
78 .hsync_len = 64,
79 .vsync_len = 2,
80 .vmode = FB_VMODE_NONINTERLACED,
81};
82
83static struct fb_fix_screeninfo mc68x328fb_fix __initdata = {
84 .id = "68328fb",
85 .type = FB_TYPE_PACKED_PIXELS,
86 .xpanstep = 1,
87 .ypanstep = 1,
88 .ywrapstep = 1,
89 .accel = FB_ACCEL_NONE,
90};
91
92 /*
93 * Interface used by the world
94 */
95int mc68x328fb_init(void);
96int mc68x328fb_setup(char *);
97
98static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
99 struct fb_info *info);
100static int mc68x328fb_set_par(struct fb_info *info);
101static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
102 u_int transp, struct fb_info *info);
103static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
104 struct fb_info *info);
105static int mc68x328fb_mmap(struct fb_info *info, struct file *file,
106 struct vm_area_struct *vma);
107
108static struct fb_ops mc68x328fb_ops = {
109 .fb_check_var = mc68x328fb_check_var,
110 .fb_set_par = mc68x328fb_set_par,
111 .fb_setcolreg = mc68x328fb_setcolreg,
112 .fb_pan_display = mc68x328fb_pan_display,
113 .fb_fillrect = cfb_fillrect,
114 .fb_copyarea = cfb_copyarea,
115 .fb_imageblit = cfb_imageblit,
116 .fb_cursor = soft_cursor,
117 .fb_mmap = mc68x328fb_mmap,
118};
119
120 /*
121 * Internal routines
122 */
123
124static u_long get_line_length(int xres_virtual, int bpp)
125{
126 u_long length;
127
128 length = xres_virtual * bpp;
129 length = (length + 31) & ~31;
130 length >>= 3;
131 return (length);
132}
133
134 /*
135 * Setting the video mode has been split into two parts.
136 * First part, xxxfb_check_var, must not write anything
137 * to hardware, it should only verify and adjust var.
138 * This means it doesn't alter par but it does use hardware
139 * data from it to check this var.
140 */
141
142static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
143 struct fb_info *info)
144{
145 u_long line_length;
146
147 /*
148 * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
149 * as FB_VMODE_SMOOTH_XPAN is only used internally
150 */
151
152 if (var->vmode & FB_VMODE_CONUPDATE) {
153 var->vmode |= FB_VMODE_YWRAP;
154 var->xoffset = info->var.xoffset;
155 var->yoffset = info->var.yoffset;
156 }
157
158 /*
159 * Some very basic checks
160 */
161 if (!var->xres)
162 var->xres = 1;
163 if (!var->yres)
164 var->yres = 1;
165 if (var->xres > var->xres_virtual)
166 var->xres_virtual = var->xres;
167 if (var->yres > var->yres_virtual)
168 var->yres_virtual = var->yres;
169 if (var->bits_per_pixel <= 1)
170 var->bits_per_pixel = 1;
171 else if (var->bits_per_pixel <= 8)
172 var->bits_per_pixel = 8;
173 else if (var->bits_per_pixel <= 16)
174 var->bits_per_pixel = 16;
175 else if (var->bits_per_pixel <= 24)
176 var->bits_per_pixel = 24;
177 else if (var->bits_per_pixel <= 32)
178 var->bits_per_pixel = 32;
179 else
180 return -EINVAL;
181
182 if (var->xres_virtual < var->xoffset + var->xres)
183 var->xres_virtual = var->xoffset + var->xres;
184 if (var->yres_virtual < var->yoffset + var->yres)
185 var->yres_virtual = var->yoffset + var->yres;
186
187 /*
188 * Memory limit
189 */
190 line_length =
191 get_line_length(var->xres_virtual, var->bits_per_pixel);
192 if (line_length * var->yres_virtual > videomemorysize)
193 return -ENOMEM;
194
195 /*
196 * Now that we checked it we alter var. The reason being is that the video
197 * mode passed in might not work but slight changes to it might make it
198 * work. This way we let the user know what is acceptable.
199 */
200 switch (var->bits_per_pixel) {
201 case 1:
202 var->red.offset = 0;
203 var->red.length = 1;
204 var->green.offset = 0;
205 var->green.length = 1;
206 var->blue.offset = 0;
207 var->blue.length = 1;
208 var->transp.offset = 0;
209 var->transp.length = 0;
210 break;
211 case 8:
212 var->red.offset = 0;
213 var->red.length = 8;
214 var->green.offset = 0;
215 var->green.length = 8;
216 var->blue.offset = 0;
217 var->blue.length = 8;
218 var->transp.offset = 0;
219 var->transp.length = 0;
220 break;
221 case 16: /* RGBA 5551 */
222 if (var->transp.length) {
223 var->red.offset = 0;
224 var->red.length = 5;
225 var->green.offset = 5;
226 var->green.length = 5;
227 var->blue.offset = 10;
228 var->blue.length = 5;
229 var->transp.offset = 15;
230 var->transp.length = 1;
231 } else { /* RGB 565 */
232 var->red.offset = 0;
233 var->red.length = 5;
234 var->green.offset = 5;
235 var->green.length = 6;
236 var->blue.offset = 11;
237 var->blue.length = 5;
238 var->transp.offset = 0;
239 var->transp.length = 0;
240 }
241 break;
242 case 24: /* RGB 888 */
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 = 0;
250 var->transp.length = 0;
251 break;
252 case 32: /* RGBA 8888 */
253 var->red.offset = 0;
254 var->red.length = 8;
255 var->green.offset = 8;
256 var->green.length = 8;
257 var->blue.offset = 16;
258 var->blue.length = 8;
259 var->transp.offset = 24;
260 var->transp.length = 8;
261 break;
262 }
263 var->red.msb_right = 0;
264 var->green.msb_right = 0;
265 var->blue.msb_right = 0;
266 var->transp.msb_right = 0;
267
268 return 0;
269}
270
271/* This routine actually sets the video mode. It's in here where we
272 * the hardware state info->par and fix which can be affected by the
273 * change in par. For this driver it doesn't do much.
274 */
275static int mc68x328fb_set_par(struct fb_info *info)
276{
277 info->fix.line_length = get_line_length(info->var.xres_virtual,
278 info->var.bits_per_pixel);
279 return 0;
280}
281
282 /*
283 * Set a single color register. The values supplied are already
284 * rounded down to the hardware's capabilities (according to the
285 * entries in the var structure). Return != 0 for invalid regno.
286 */
287
288static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
289 u_int transp, struct fb_info *info)
290{
291 if (regno >= 256) /* no. of hw registers */
292 return 1;
293 /*
294 * Program hardware... do anything you want with transp
295 */
296
297 /* grayscale works only partially under directcolor */
298 if (info->var.grayscale) {
299 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
300 red = green = blue =
301 (red * 77 + green * 151 + blue * 28) >> 8;
302 }
303
304 /* Directcolor:
305 * var->{color}.offset contains start of bitfield
306 * var->{color}.length contains length of bitfield
307 * {hardwarespecific} contains width of RAMDAC
308 * cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset)
309 * RAMDAC[X] is programmed to (red, green, blue)
310 *
311 * Pseudocolor:
312 * uses offset = 0 && length = RAMDAC register width.
313 * var->{color}.offset is 0
314 * var->{color}.length contains widht of DAC
315 * cmap is not used
316 * RAMDAC[X] is programmed to (red, green, blue)
317 * Truecolor:
318 * does not use DAC. Usually 3 are present.
319 * var->{color}.offset contains start of bitfield
320 * var->{color}.length contains length of bitfield
321 * cmap is programmed to (red << red.offset) | (green << green.offset) |
322 * (blue << blue.offset) | (transp << transp.offset)
323 * RAMDAC does not exist
324 */
325#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
326 switch (info->fix.visual) {
327 case FB_VISUAL_TRUECOLOR:
328 case FB_VISUAL_PSEUDOCOLOR:
329 red = CNVT_TOHW(red, info->var.red.length);
330 green = CNVT_TOHW(green, info->var.green.length);
331 blue = CNVT_TOHW(blue, info->var.blue.length);
332 transp = CNVT_TOHW(transp, info->var.transp.length);
333 break;
334 case FB_VISUAL_DIRECTCOLOR:
335 red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */
336 green = CNVT_TOHW(green, 8);
337 blue = CNVT_TOHW(blue, 8);
338 /* hey, there is bug in transp handling... */
339 transp = CNVT_TOHW(transp, 8);
340 break;
341 }
342#undef CNVT_TOHW
343 /* Truecolor has hardware independent palette */
344 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
345 u32 v;
346
347 if (regno >= 16)
348 return 1;
349
350 v = (red << info->var.red.offset) |
351 (green << info->var.green.offset) |
352 (blue << info->var.blue.offset) |
353 (transp << info->var.transp.offset);
354 switch (info->var.bits_per_pixel) {
355 case 8:
356 break;
357 case 16:
358 ((u32 *) (info->pseudo_palette))[regno] = v;
359 break;
360 case 24:
361 case 32:
362 ((u32 *) (info->pseudo_palette))[regno] = v;
363 break;
364 }
365 return 0;
366 }
367 return 0;
368}
369
370 /*
371 * Pan or Wrap the Display
372 *
373 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
374 */
375
376static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
377 struct fb_info *info)
378{
379 if (var->vmode & FB_VMODE_YWRAP) {
380 if (var->yoffset < 0
381 || var->yoffset >= info->var.yres_virtual
382 || var->xoffset)
383 return -EINVAL;
384 } else {
385 if (var->xoffset + var->xres > info->var.xres_virtual ||
386 var->yoffset + var->yres > info->var.yres_virtual)
387 return -EINVAL;
388 }
389 info->var.xoffset = var->xoffset;
390 info->var.yoffset = var->yoffset;
391 if (var->vmode & FB_VMODE_YWRAP)
392 info->var.vmode |= FB_VMODE_YWRAP;
393 else
394 info->var.vmode &= ~FB_VMODE_YWRAP;
395 return 0;
396}
397
398 /*
399 * Most drivers don't need their own mmap function
400 */
401
402static int mc68x328fb_mmap(struct fb_info *info, struct file *file,
403 struct vm_area_struct *vma)
404{
405#ifndef MMU
406 /* this is uClinux (no MMU) specific code */
407
408 vma->vm_flags |= VM_RESERVED;
409 vma->vm_start = videomemory;
410
411 return 0;
412#else
413 return -EINVAL;
414#endif
415}
416
417int __init mc68x328fb_setup(char *options)
418{
419#if 0
420 char *this_opt;
421#endif
422
423 if (!options || !*options)
424 return 1;
425#if 0
426 while ((this_opt = strsep(&options, ",")) != NULL) {
427 if (!*this_opt)
428 continue;
429 if (!strncmp(this_opt, "disable", 7))
430 mc68x328fb_enable = 0;
431 }
432#endif
433 return 1;
434}
435
436 /*
437 * Initialisation
438 */
439
440int __init mc68x328fb_init(void)
441{
442#ifndef MODULE
443 char *option = NULL;
444
445 if (fb_get_options("68328fb", &option))
446 return -ENODEV;
447 mc68x328fb_setup(option);
448#endif
449 /*
450 * initialize the default mode from the LCD controller registers
451 */
452 mc68x328fb_default.xres = LXMAX;
453 mc68x328fb_default.yres = LYMAX+1;
454 mc68x328fb_default.xres_virtual = mc68x328fb_default.xres;
455 mc68x328fb_default.yres_virtual = mc68x328fb_default.yres;
456 mc68x328fb_default.bits_per_pixel = 1 + (LPICF & 0x01);
457 videomemory = LSSA;
458 videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 *
459 mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel;
460
461 fb_info.screen_base = (void *)videomemory;
462 fb_info.fbops = &mc68x328fb_ops;
463 fb_info.var = mc68x328fb_default;
464 fb_info.fix = mc68x328fb_fix;
465 fb_info.fix.smem_start = videomemory;
466 fb_info.fix.smem_len = videomemorysize;
467 fb_info.fix.line_length =
468 get_line_length(mc68x328fb_default.xres_virtual, mc68x328fb_default.bits_per_pixel);
469 fb_info.fix.visual = (mc68x328fb_default.bits_per_pixel) == 1 ?
470 MC68X328FB_MONO_VISUAL : FB_VISUAL_PSEUDOCOLOR;
471 if (fb_info.var.bits_per_pixel == 1) {
472 fb_info.var.red.length = fb_info.var.green.length = fb_info.var.blue.length = 1;
473 fb_info.var.red.offset = fb_info.var.green.offset = fb_info.var.blue.offset = 0;
474 }
475 fb_info.pseudo_palette = &mc68x328fb_pseudo_palette;
476 fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
477
478 fb_alloc_cmap(&fb_info.cmap, 256, 0);
479
480 if (register_framebuffer(&fb_info) < 0) {
481 return -EINVAL;
482 }
483
484 printk(KERN_INFO
485 "fb%d: %s frame buffer device\n", fb_info.node, fb_info.fix.id);
486 printk(KERN_INFO
487 "fb%d: %dx%dx%d at 0x%08lx\n", fb_info.node,
488 mc68x328fb_default.xres_virtual, mc68x328fb_default.yres_virtual,
489 1 << mc68x328fb_default.bits_per_pixel, videomemory);
490
491 return 0;
492}
493
494module_init(mc68x328fb_init);
495
496#ifdef MODULE
497
498static void __exit mc68x328fb_cleanup(void)
499{
500 unregister_framebuffer(&fb_info);
501}
502
503module_exit(mc68x328fb_cleanup);
504
505MODULE_LICENSE("GPL");
506#endif /* MODULE */