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 file *file,
106 struct vm_area_struct *vma);
108 static 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_mmap = mc68x328fb_mmap,
123 static u_long get_line_length(int xres_virtual, int bpp)
127 length = xres_virtual * bpp;
128 length = (length + 31) & ~31;
134 * Setting the video mode has been split into two parts.
135 * First part, xxxfb_check_var, must not write anything
136 * to hardware, it should only verify and adjust var.
137 * This means it doesn't alter par but it does use hardware
138 * data from it to check this var.
141 static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
142 struct fb_info *info)
147 * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
148 * as FB_VMODE_SMOOTH_XPAN is only used internally
151 if (var->vmode & FB_VMODE_CONUPDATE) {
152 var->vmode |= FB_VMODE_YWRAP;
153 var->xoffset = info->var.xoffset;
154 var->yoffset = info->var.yoffset;
158 * Some very basic checks
164 if (var->xres > var->xres_virtual)
165 var->xres_virtual = var->xres;
166 if (var->yres > var->yres_virtual)
167 var->yres_virtual = var->yres;
168 if (var->bits_per_pixel <= 1)
169 var->bits_per_pixel = 1;
170 else if (var->bits_per_pixel <= 8)
171 var->bits_per_pixel = 8;
172 else if (var->bits_per_pixel <= 16)
173 var->bits_per_pixel = 16;
174 else if (var->bits_per_pixel <= 24)
175 var->bits_per_pixel = 24;
176 else if (var->bits_per_pixel <= 32)
177 var->bits_per_pixel = 32;
181 if (var->xres_virtual < var->xoffset + var->xres)
182 var->xres_virtual = var->xoffset + var->xres;
183 if (var->yres_virtual < var->yoffset + var->yres)
184 var->yres_virtual = var->yoffset + var->yres;
190 get_line_length(var->xres_virtual, var->bits_per_pixel);
191 if (line_length * var->yres_virtual > videomemorysize)
195 * Now that we checked it we alter var. The reason being is that the video
196 * mode passed in might not work but slight changes to it might make it
197 * work. This way we let the user know what is acceptable.
199 switch (var->bits_per_pixel) {
203 var->green.offset = 0;
204 var->green.length = 1;
205 var->blue.offset = 0;
206 var->blue.length = 1;
207 var->transp.offset = 0;
208 var->transp.length = 0;
213 var->green.offset = 0;
214 var->green.length = 8;
215 var->blue.offset = 0;
216 var->blue.length = 8;
217 var->transp.offset = 0;
218 var->transp.length = 0;
220 case 16: /* RGBA 5551 */
221 if (var->transp.length) {
224 var->green.offset = 5;
225 var->green.length = 5;
226 var->blue.offset = 10;
227 var->blue.length = 5;
228 var->transp.offset = 15;
229 var->transp.length = 1;
230 } else { /* RGB 565 */
233 var->green.offset = 5;
234 var->green.length = 6;
235 var->blue.offset = 11;
236 var->blue.length = 5;
237 var->transp.offset = 0;
238 var->transp.length = 0;
241 case 24: /* RGB 888 */
244 var->green.offset = 8;
245 var->green.length = 8;
246 var->blue.offset = 16;
247 var->blue.length = 8;
248 var->transp.offset = 0;
249 var->transp.length = 0;
251 case 32: /* RGBA 8888 */
254 var->green.offset = 8;
255 var->green.length = 8;
256 var->blue.offset = 16;
257 var->blue.length = 8;
258 var->transp.offset = 24;
259 var->transp.length = 8;
262 var->red.msb_right = 0;
263 var->green.msb_right = 0;
264 var->blue.msb_right = 0;
265 var->transp.msb_right = 0;
270 /* This routine actually sets the video mode. It's in here where we
271 * the hardware state info->par and fix which can be affected by the
272 * change in par. For this driver it doesn't do much.
274 static int mc68x328fb_set_par(struct fb_info *info)
276 info->fix.line_length = get_line_length(info->var.xres_virtual,
277 info->var.bits_per_pixel);
282 * Set a single color register. The values supplied are already
283 * rounded down to the hardware's capabilities (according to the
284 * entries in the var structure). Return != 0 for invalid regno.
287 static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
288 u_int transp, struct fb_info *info)
290 if (regno >= 256) /* no. of hw registers */
293 * Program hardware... do anything you want with transp
296 /* grayscale works only partially under directcolor */
297 if (info->var.grayscale) {
298 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
300 (red * 77 + green * 151 + blue * 28) >> 8;
304 * var->{color}.offset contains start of bitfield
305 * var->{color}.length contains length of bitfield
306 * {hardwarespecific} contains width of RAMDAC
307 * cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset)
308 * RAMDAC[X] is programmed to (red, green, blue)
311 * uses offset = 0 && length = RAMDAC register width.
312 * var->{color}.offset is 0
313 * var->{color}.length contains widht of DAC
315 * RAMDAC[X] is programmed to (red, green, blue)
317 * does not use DAC. Usually 3 are present.
318 * var->{color}.offset contains start of bitfield
319 * var->{color}.length contains length of bitfield
320 * cmap is programmed to (red << red.offset) | (green << green.offset) |
321 * (blue << blue.offset) | (transp << transp.offset)
322 * RAMDAC does not exist
324 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
325 switch (info->fix.visual) {
326 case FB_VISUAL_TRUECOLOR:
327 case FB_VISUAL_PSEUDOCOLOR:
328 red = CNVT_TOHW(red, info->var.red.length);
329 green = CNVT_TOHW(green, info->var.green.length);
330 blue = CNVT_TOHW(blue, info->var.blue.length);
331 transp = CNVT_TOHW(transp, info->var.transp.length);
333 case FB_VISUAL_DIRECTCOLOR:
334 red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */
335 green = CNVT_TOHW(green, 8);
336 blue = CNVT_TOHW(blue, 8);
337 /* hey, there is bug in transp handling... */
338 transp = CNVT_TOHW(transp, 8);
342 /* Truecolor has hardware independent palette */
343 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
349 v = (red << info->var.red.offset) |
350 (green << info->var.green.offset) |
351 (blue << info->var.blue.offset) |
352 (transp << info->var.transp.offset);
353 switch (info->var.bits_per_pixel) {
357 ((u32 *) (info->pseudo_palette))[regno] = v;
361 ((u32 *) (info->pseudo_palette))[regno] = v;
370 * Pan or Wrap the Display
372 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
375 static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
376 struct fb_info *info)
378 if (var->vmode & FB_VMODE_YWRAP) {
380 || var->yoffset >= info->var.yres_virtual
384 if (var->xoffset + var->xres > info->var.xres_virtual ||
385 var->yoffset + var->yres > info->var.yres_virtual)
388 info->var.xoffset = var->xoffset;
389 info->var.yoffset = var->yoffset;
390 if (var->vmode & FB_VMODE_YWRAP)
391 info->var.vmode |= FB_VMODE_YWRAP;
393 info->var.vmode &= ~FB_VMODE_YWRAP;
398 * Most drivers don't need their own mmap function
401 static int mc68x328fb_mmap(struct fb_info *info, struct file *file,
402 struct vm_area_struct *vma)
405 /* this is uClinux (no MMU) specific code */
407 vma->vm_flags |= VM_RESERVED;
408 vma->vm_start = videomemory;
416 int __init mc68x328fb_setup(char *options)
422 if (!options || !*options)
425 while ((this_opt = strsep(&options, ",")) != NULL) {
428 if (!strncmp(this_opt, "disable", 7))
429 mc68x328fb_enable = 0;
439 int __init mc68x328fb_init(void)
444 if (fb_get_options("68328fb", &option))
446 mc68x328fb_setup(option);
449 * initialize the default mode from the LCD controller registers
451 mc68x328fb_default.xres = LXMAX;
452 mc68x328fb_default.yres = LYMAX+1;
453 mc68x328fb_default.xres_virtual = mc68x328fb_default.xres;
454 mc68x328fb_default.yres_virtual = mc68x328fb_default.yres;
455 mc68x328fb_default.bits_per_pixel = 1 + (LPICF & 0x01);
457 videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 *
458 mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel;
460 fb_info.screen_base = (void *)videomemory;
461 fb_info.fbops = &mc68x328fb_ops;
462 fb_info.var = mc68x328fb_default;
463 fb_info.fix = mc68x328fb_fix;
464 fb_info.fix.smem_start = videomemory;
465 fb_info.fix.smem_len = videomemorysize;
466 fb_info.fix.line_length =
467 get_line_length(mc68x328fb_default.xres_virtual, mc68x328fb_default.bits_per_pixel);
468 fb_info.fix.visual = (mc68x328fb_default.bits_per_pixel) == 1 ?
469 MC68X328FB_MONO_VISUAL : FB_VISUAL_PSEUDOCOLOR;
470 if (fb_info.var.bits_per_pixel == 1) {
471 fb_info.var.red.length = fb_info.var.green.length = fb_info.var.blue.length = 1;
472 fb_info.var.red.offset = fb_info.var.green.offset = fb_info.var.blue.offset = 0;
474 fb_info.pseudo_palette = &mc68x328fb_pseudo_palette;
475 fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
477 fb_alloc_cmap(&fb_info.cmap, 256, 0);
479 if (register_framebuffer(&fb_info) < 0) {
484 "fb%d: %s frame buffer device\n", fb_info.node, fb_info.fix.id);
486 "fb%d: %dx%dx%d at 0x%08lx\n", fb_info.node,
487 mc68x328fb_default.xres_virtual, mc68x328fb_default.yres_virtual,
488 1 << mc68x328fb_default.bits_per_pixel, videomemory);
493 module_init(mc68x328fb_init);
497 static void __exit mc68x328fb_cleanup(void)
499 unregister_framebuffer(&fb_info);
502 module_exit(mc68x328fb_cleanup);
504 MODULE_LICENSE("GPL");