blob: 78488bb41aeb1d984ba6f2a32f485378c07f883f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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);
Christoph Hellwig216d5262006-01-14 13:21:25 -0800105static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107static struct fb_ops mc68x328fb_ops = {
108 .fb_check_var = mc68x328fb_check_var,
109 .fb_set_par = mc68x328fb_set_par,
110 .fb_setcolreg = mc68x328fb_setcolreg,
111 .fb_pan_display = mc68x328fb_pan_display,
112 .fb_fillrect = cfb_fillrect,
113 .fb_copyarea = cfb_copyarea,
114 .fb_imageblit = cfb_imageblit,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 .fb_mmap = mc68x328fb_mmap,
116};
117
118 /*
119 * Internal routines
120 */
121
122static u_long get_line_length(int xres_virtual, int bpp)
123{
124 u_long length;
125
126 length = xres_virtual * bpp;
127 length = (length + 31) & ~31;
128 length >>= 3;
129 return (length);
130}
131
132 /*
133 * Setting the video mode has been split into two parts.
134 * First part, xxxfb_check_var, must not write anything
135 * to hardware, it should only verify and adjust var.
136 * This means it doesn't alter par but it does use hardware
137 * data from it to check this var.
138 */
139
140static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
141 struct fb_info *info)
142{
143 u_long line_length;
144
145 /*
146 * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
147 * as FB_VMODE_SMOOTH_XPAN is only used internally
148 */
149
150 if (var->vmode & FB_VMODE_CONUPDATE) {
151 var->vmode |= FB_VMODE_YWRAP;
152 var->xoffset = info->var.xoffset;
153 var->yoffset = info->var.yoffset;
154 }
155
156 /*
157 * Some very basic checks
158 */
159 if (!var->xres)
160 var->xres = 1;
161 if (!var->yres)
162 var->yres = 1;
163 if (var->xres > var->xres_virtual)
164 var->xres_virtual = var->xres;
165 if (var->yres > var->yres_virtual)
166 var->yres_virtual = var->yres;
167 if (var->bits_per_pixel <= 1)
168 var->bits_per_pixel = 1;
169 else if (var->bits_per_pixel <= 8)
170 var->bits_per_pixel = 8;
171 else if (var->bits_per_pixel <= 16)
172 var->bits_per_pixel = 16;
173 else if (var->bits_per_pixel <= 24)
174 var->bits_per_pixel = 24;
175 else if (var->bits_per_pixel <= 32)
176 var->bits_per_pixel = 32;
177 else
178 return -EINVAL;
179
180 if (var->xres_virtual < var->xoffset + var->xres)
181 var->xres_virtual = var->xoffset + var->xres;
182 if (var->yres_virtual < var->yoffset + var->yres)
183 var->yres_virtual = var->yoffset + var->yres;
184
185 /*
186 * Memory limit
187 */
188 line_length =
189 get_line_length(var->xres_virtual, var->bits_per_pixel);
190 if (line_length * var->yres_virtual > videomemorysize)
191 return -ENOMEM;
192
193 /*
194 * Now that we checked it we alter var. The reason being is that the video
195 * mode passed in might not work but slight changes to it might make it
196 * work. This way we let the user know what is acceptable.
197 */
198 switch (var->bits_per_pixel) {
199 case 1:
200 var->red.offset = 0;
201 var->red.length = 1;
202 var->green.offset = 0;
203 var->green.length = 1;
204 var->blue.offset = 0;
205 var->blue.length = 1;
206 var->transp.offset = 0;
207 var->transp.length = 0;
208 break;
209 case 8:
210 var->red.offset = 0;
211 var->red.length = 8;
212 var->green.offset = 0;
213 var->green.length = 8;
214 var->blue.offset = 0;
215 var->blue.length = 8;
216 var->transp.offset = 0;
217 var->transp.length = 0;
218 break;
219 case 16: /* RGBA 5551 */
220 if (var->transp.length) {
221 var->red.offset = 0;
222 var->red.length = 5;
223 var->green.offset = 5;
224 var->green.length = 5;
225 var->blue.offset = 10;
226 var->blue.length = 5;
227 var->transp.offset = 15;
228 var->transp.length = 1;
229 } else { /* RGB 565 */
230 var->red.offset = 0;
231 var->red.length = 5;
232 var->green.offset = 5;
233 var->green.length = 6;
234 var->blue.offset = 11;
235 var->blue.length = 5;
236 var->transp.offset = 0;
237 var->transp.length = 0;
238 }
239 break;
240 case 24: /* RGB 888 */
241 var->red.offset = 0;
242 var->red.length = 8;
243 var->green.offset = 8;
244 var->green.length = 8;
245 var->blue.offset = 16;
246 var->blue.length = 8;
247 var->transp.offset = 0;
248 var->transp.length = 0;
249 break;
250 case 32: /* RGBA 8888 */
251 var->red.offset = 0;
252 var->red.length = 8;
253 var->green.offset = 8;
254 var->green.length = 8;
255 var->blue.offset = 16;
256 var->blue.length = 8;
257 var->transp.offset = 24;
258 var->transp.length = 8;
259 break;
260 }
261 var->red.msb_right = 0;
262 var->green.msb_right = 0;
263 var->blue.msb_right = 0;
264 var->transp.msb_right = 0;
265
266 return 0;
267}
268
269/* This routine actually sets the video mode. It's in here where we
270 * the hardware state info->par and fix which can be affected by the
271 * change in par. For this driver it doesn't do much.
272 */
273static int mc68x328fb_set_par(struct fb_info *info)
274{
275 info->fix.line_length = get_line_length(info->var.xres_virtual,
276 info->var.bits_per_pixel);
277 return 0;
278}
279
280 /*
281 * Set a single color register. The values supplied are already
282 * rounded down to the hardware's capabilities (according to the
283 * entries in the var structure). Return != 0 for invalid regno.
284 */
285
286static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
287 u_int transp, struct fb_info *info)
288{
289 if (regno >= 256) /* no. of hw registers */
290 return 1;
291 /*
292 * Program hardware... do anything you want with transp
293 */
294
295 /* grayscale works only partially under directcolor */
296 if (info->var.grayscale) {
297 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
298 red = green = blue =
299 (red * 77 + green * 151 + blue * 28) >> 8;
300 }
301
302 /* Directcolor:
303 * var->{color}.offset contains start of bitfield
304 * var->{color}.length contains length of bitfield
305 * {hardwarespecific} contains width of RAMDAC
306 * cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset)
307 * RAMDAC[X] is programmed to (red, green, blue)
308 *
309 * Pseudocolor:
310 * uses offset = 0 && length = RAMDAC register width.
311 * var->{color}.offset is 0
312 * var->{color}.length contains widht of DAC
313 * cmap is not used
314 * RAMDAC[X] is programmed to (red, green, blue)
315 * Truecolor:
316 * does not use DAC. Usually 3 are present.
317 * var->{color}.offset contains start of bitfield
318 * var->{color}.length contains length of bitfield
319 * cmap is programmed to (red << red.offset) | (green << green.offset) |
320 * (blue << blue.offset) | (transp << transp.offset)
321 * RAMDAC does not exist
322 */
323#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
324 switch (info->fix.visual) {
325 case FB_VISUAL_TRUECOLOR:
326 case FB_VISUAL_PSEUDOCOLOR:
327 red = CNVT_TOHW(red, info->var.red.length);
328 green = CNVT_TOHW(green, info->var.green.length);
329 blue = CNVT_TOHW(blue, info->var.blue.length);
330 transp = CNVT_TOHW(transp, info->var.transp.length);
331 break;
332 case FB_VISUAL_DIRECTCOLOR:
333 red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */
334 green = CNVT_TOHW(green, 8);
335 blue = CNVT_TOHW(blue, 8);
336 /* hey, there is bug in transp handling... */
337 transp = CNVT_TOHW(transp, 8);
338 break;
339 }
340#undef CNVT_TOHW
341 /* Truecolor has hardware independent palette */
342 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
343 u32 v;
344
345 if (regno >= 16)
346 return 1;
347
348 v = (red << info->var.red.offset) |
349 (green << info->var.green.offset) |
350 (blue << info->var.blue.offset) |
351 (transp << info->var.transp.offset);
352 switch (info->var.bits_per_pixel) {
353 case 8:
354 break;
355 case 16:
356 ((u32 *) (info->pseudo_palette))[regno] = v;
357 break;
358 case 24:
359 case 32:
360 ((u32 *) (info->pseudo_palette))[regno] = v;
361 break;
362 }
363 return 0;
364 }
365 return 0;
366}
367
368 /*
369 * Pan or Wrap the Display
370 *
371 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
372 */
373
374static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
375 struct fb_info *info)
376{
377 if (var->vmode & FB_VMODE_YWRAP) {
378 if (var->yoffset < 0
379 || var->yoffset >= info->var.yres_virtual
380 || var->xoffset)
381 return -EINVAL;
382 } else {
383 if (var->xoffset + var->xres > info->var.xres_virtual ||
384 var->yoffset + var->yres > info->var.yres_virtual)
385 return -EINVAL;
386 }
387 info->var.xoffset = var->xoffset;
388 info->var.yoffset = var->yoffset;
389 if (var->vmode & FB_VMODE_YWRAP)
390 info->var.vmode |= FB_VMODE_YWRAP;
391 else
392 info->var.vmode &= ~FB_VMODE_YWRAP;
393 return 0;
394}
395
396 /*
397 * Most drivers don't need their own mmap function
398 */
399
Christoph Hellwig216d5262006-01-14 13:21:25 -0800400static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401{
402#ifndef MMU
403 /* this is uClinux (no MMU) specific code */
404
405 vma->vm_flags |= VM_RESERVED;
406 vma->vm_start = videomemory;
407
408 return 0;
409#else
410 return -EINVAL;
411#endif
412}
413
414int __init mc68x328fb_setup(char *options)
415{
416#if 0
417 char *this_opt;
418#endif
419
420 if (!options || !*options)
421 return 1;
422#if 0
423 while ((this_opt = strsep(&options, ",")) != NULL) {
424 if (!*this_opt)
425 continue;
426 if (!strncmp(this_opt, "disable", 7))
427 mc68x328fb_enable = 0;
428 }
429#endif
430 return 1;
431}
432
433 /*
434 * Initialisation
435 */
436
437int __init mc68x328fb_init(void)
438{
439#ifndef MODULE
440 char *option = NULL;
441
442 if (fb_get_options("68328fb", &option))
443 return -ENODEV;
444 mc68x328fb_setup(option);
445#endif
446 /*
447 * initialize the default mode from the LCD controller registers
448 */
449 mc68x328fb_default.xres = LXMAX;
450 mc68x328fb_default.yres = LYMAX+1;
451 mc68x328fb_default.xres_virtual = mc68x328fb_default.xres;
452 mc68x328fb_default.yres_virtual = mc68x328fb_default.yres;
453 mc68x328fb_default.bits_per_pixel = 1 + (LPICF & 0x01);
454 videomemory = LSSA;
455 videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 *
456 mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel;
457
458 fb_info.screen_base = (void *)videomemory;
459 fb_info.fbops = &mc68x328fb_ops;
460 fb_info.var = mc68x328fb_default;
461 fb_info.fix = mc68x328fb_fix;
462 fb_info.fix.smem_start = videomemory;
463 fb_info.fix.smem_len = videomemorysize;
464 fb_info.fix.line_length =
465 get_line_length(mc68x328fb_default.xres_virtual, mc68x328fb_default.bits_per_pixel);
466 fb_info.fix.visual = (mc68x328fb_default.bits_per_pixel) == 1 ?
467 MC68X328FB_MONO_VISUAL : FB_VISUAL_PSEUDOCOLOR;
468 if (fb_info.var.bits_per_pixel == 1) {
469 fb_info.var.red.length = fb_info.var.green.length = fb_info.var.blue.length = 1;
470 fb_info.var.red.offset = fb_info.var.green.offset = fb_info.var.blue.offset = 0;
471 }
472 fb_info.pseudo_palette = &mc68x328fb_pseudo_palette;
473 fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
474
475 fb_alloc_cmap(&fb_info.cmap, 256, 0);
476
477 if (register_framebuffer(&fb_info) < 0) {
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
491module_init(mc68x328fb_init);
492
493#ifdef MODULE
494
495static void __exit mc68x328fb_cleanup(void)
496{
497 unregister_framebuffer(&fb_info);
498}
499
500module_exit(mc68x328fb_cleanup);
501
502MODULE_LICENSE("GPL");
503#endif /* MODULE */