2 * linux/drivers/video/68328fb.c -- Low level implementation of the
3 * mc68x328 LCD frame buffer device
5 * Copyright (C) 2003 Georges Menie
7 * This driver assumes an already configured controller (e.g. from config.c)
8 * Keep the code clean of board specific initialization.
10 * This code has not been tested with colors, colormap management functions
11 * are minimal (no colormap data written to the 68328 registers...)
13 * initial version of this driver:
14 * Copyright (C) 1998,1999 Kenneth Albanowski <kjahds@kjahds.com>,
15 * The Silver Hammer Group, Ltd.
17 * this version is based on :
19 * linux/drivers/video/vfb.c -- Virtual frame buffer device
21 * Copyright (C) 2002 James Simmons
23 * Copyright (C) 1997 Geert Uytterhoeven
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
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/errno.h>
33 #include <linux/string.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>
42 #include <linux/init.h>
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>
51 #error wrong architecture for the MC68x328 frame buffer device
54 #if defined(CONFIG_FB_68328_INVERT)
55 #define MC68X328FB_MONO_VISUAL FB_VISUAL_MONO01
57 #define MC68X328FB_MONO_VISUAL FB_VISUAL_MONO10
60 static u_long videomemory;
61 static u_long videomemorysize;
63 static struct fb_info fb_info;
64 static u32 mc68x328fb_pseudo_palette[17];
66 static struct fb_var_screeninfo mc68x328fb_default __initdata = {
70 .activate = FB_ACTIVATE_TEST,
80 .vmode = FB_VMODE_NONINTERLACED,
83 static struct fb_fix_screeninfo mc68x328fb_fix __initdata = {
85 .type = FB_TYPE_PACKED_PIXELS,
89 .accel = FB_ACCEL_NONE,
93 * Interface used by the world
95 int mc68x328fb_init(void);
96 int mc68x328fb_setup(char *);
98 static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
99 struct fb_info *info);
100 static int mc68x328fb_set_par(struct fb_info *info);
101 static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
102 u_int transp, struct fb_info *info);
103 static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
104 struct fb_info *info);
105 static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma);
107 static 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,
115 .fb_mmap = mc68x328fb_mmap,
122 static u_long get_line_length(int xres_virtual, int bpp)
126 length = xres_virtual * bpp;
127 length = (length + 31) & ~31;
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.
140 static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
141 struct fb_info *info)
146 * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
147 * as FB_VMODE_SMOOTH_XPAN is only used internally
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;
157 * Some very basic checks
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;
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;
189 get_line_length(var->xres_virtual, var->bits_per_pixel);
190 if (line_length * var->yres_virtual > videomemorysize)
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.
198 switch (var->bits_per_pixel) {
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;
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;
219 case 16: /* RGBA 5551 */
220 if (var->transp.length) {
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 */
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;
240 case 24: /* RGB 888 */
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;
250 case 32: /* RGBA 8888 */
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;
261 var->red.msb_right = 0;
262 var->green.msb_right = 0;
263 var->blue.msb_right = 0;
264 var->transp.msb_right = 0;
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.
273 static int mc68x328fb_set_par(struct fb_info *info)
275 info->fix.line_length = get_line_length(info->var.xres_virtual,
276 info->var.bits_per_pixel);
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.
286 static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
287 u_int transp, struct fb_info *info)
289 if (regno >= 256) /* no. of hw registers */
292 * Program hardware... do anything you want with transp
295 /* grayscale works only partially under directcolor */
296 if (info->var.grayscale) {
297 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
299 (red * 77 + green * 151 + blue * 28) >> 8;
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)
310 * uses offset = 0 && length = RAMDAC register width.
311 * var->{color}.offset is 0
312 * var->{color}.length contains widht of DAC
314 * RAMDAC[X] is programmed to (red, green, blue)
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
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);
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);
341 /* Truecolor has hardware independent palette */
342 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
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) {
356 ((u32 *) (info->pseudo_palette))[regno] = v;
360 ((u32 *) (info->pseudo_palette))[regno] = v;
369 * Pan or Wrap the Display
371 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
374 static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
375 struct fb_info *info)
377 if (var->vmode & FB_VMODE_YWRAP) {
379 || var->yoffset >= info->var.yres_virtual
383 if (var->xoffset + var->xres > info->var.xres_virtual ||
384 var->yoffset + var->yres > info->var.yres_virtual)
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;
392 info->var.vmode &= ~FB_VMODE_YWRAP;
397 * Most drivers don't need their own mmap function
400 static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
403 /* this is uClinux (no MMU) specific code */
405 vma->vm_flags |= VM_RESERVED;
406 vma->vm_start = videomemory;
414 int __init mc68x328fb_setup(char *options)
420 if (!options || !*options)
423 while ((this_opt = strsep(&options, ",")) != NULL) {
426 if (!strncmp(this_opt, "disable", 7))
427 mc68x328fb_enable = 0;
437 int __init mc68x328fb_init(void)
442 if (fb_get_options("68328fb", &option))
444 mc68x328fb_setup(option);
447 * initialize the default mode from the LCD controller registers
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);
455 videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 *
456 mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel;
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;
472 fb_info.pseudo_palette = &mc68x328fb_pseudo_palette;
473 fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
475 fb_alloc_cmap(&fb_info.cmap, 256, 0);
477 if (register_framebuffer(&fb_info) < 0) {
482 "fb%d: %s frame buffer device\n", fb_info.node, fb_info.fix.id);
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);
491 module_init(mc68x328fb_init);
495 static void __exit mc68x328fb_cleanup(void)
497 unregister_framebuffer(&fb_info);
500 module_exit(mc68x328fb_cleanup);
502 MODULE_LICENSE("GPL");