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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#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
58static u_long videomemory;
59static u_long videomemorysize;
60
61static struct fb_info fb_info;
Antonino A. Daplas5a177592007-07-17 04:05:34 -070062static u32 mc68x328fb_pseudo_palette[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64static 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
81static 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 */
93int mc68x328fb_init(void);
94int mc68x328fb_setup(char *);
95
96static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
97 struct fb_info *info);
98static int mc68x328fb_set_par(struct fb_info *info);
99static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
100 u_int transp, struct fb_info *info);
101static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
102 struct fb_info *info);
Christoph Hellwig216d5262006-01-14 13:21:25 -0800103static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
105static 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,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 .fb_mmap = mc68x328fb_mmap,
114};
115
116 /*
117 * Internal routines
118 */
119
120static 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
138static 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 */
271static 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
284static 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
Daniel Mack551e3782010-01-28 16:11:51 +0800310 * var->{color}.length contains width of DAC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 * 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
372static 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 {
Laurent Pinchart2e1e5972011-05-25 11:34:52 +0200381 if (var->xoffset + info->var.xres > info->var.xres_virtual ||
382 var->yoffset + info->var.yres > info->var.yres_virtual)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 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
Christoph Hellwig216d5262006-01-14 13:21:25 -0800398static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399{
400#ifndef MMU
401 /* this is uClinux (no MMU) specific code */
402
Konstantin Khlebnikov314e51b2012-10-08 16:29:02 -0700403 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 vma->vm_start = videomemory;
405
406 return 0;
407#else
408 return -EINVAL;
409#endif
410}
411
412int __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
435int __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
Andres Salomone98d9b42009-03-31 15:25:28 -0700473 if (fb_alloc_cmap(&fb_info.cmap, 256, 0))
474 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476 if (register_framebuffer(&fb_info) < 0) {
Andres Salomone98d9b42009-03-31 15:25:28 -0700477 fb_dealloc_cmap(&fb_info.cmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 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);
Andres Salomone98d9b42009-03-31 15:25:28 -0700498 fb_dealloc_cmap(&fb_info.cmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499}
500
501module_exit(mc68x328fb_cleanup);
502
503MODULE_LICENSE("GPL");
504#endif /* MODULE */