initial commit with v2.6.9
[linux-2.6.9-moxart.git] / drivers / video / vesafb.c
blobc5c649d9b1aebf7fcd0dbbbc84ee2153437a62c8
1 /*
2 * framebuffer driver for VBE 2.0 compliant graphic boards
4 * switching to graphics mode happens at boot time (while
5 * running in real mode, see arch/i386/boot/video.S).
7 * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
9 */
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/mm.h>
16 #include <linux/tty.h>
17 #include <linux/slab.h>
18 #include <linux/delay.h>
19 #include <linux/fb.h>
20 #include <linux/ioport.h>
21 #include <linux/init.h>
22 #ifdef __i386__
23 #include <video/edid.h>
24 #endif
25 #include <asm/io.h>
26 #include <asm/mtrr.h>
28 #define dac_reg (0x3c8)
29 #define dac_val (0x3c9)
31 /* --------------------------------------------------------------------- */
33 static struct fb_var_screeninfo vesafb_defined __initdata = {
34 .activate = FB_ACTIVATE_NOW,
35 .height = -1,
36 .width = -1,
37 .right_margin = 32,
38 .upper_margin = 16,
39 .lower_margin = 4,
40 .vsync_len = 4,
41 .vmode = FB_VMODE_NONINTERLACED,
44 static struct fb_fix_screeninfo vesafb_fix __initdata = {
45 .id = "VESA VGA",
46 .type = FB_TYPE_PACKED_PIXELS,
47 .accel = FB_ACCEL_NONE,
50 static int inverse = 0;
51 static int mtrr = 1;
52 static int vram __initdata = 0; /* Set amount of memory to be used */
53 static int pmi_setpal = 0; /* pmi for palette changes ??? */
54 static int ypan = 0; /* 0..nothing, 1..ypan, 2..ywrap */
55 static unsigned short *pmi_base = NULL;
56 static void (*pmi_start)(void);
57 static void (*pmi_pal)(void);
59 /* --------------------------------------------------------------------- */
61 static int vesafb_pan_display(struct fb_var_screeninfo *var,
62 struct fb_info *info)
64 #ifdef __i386__
65 int offset;
67 if (!ypan)
68 return -EINVAL;
69 if (var->xoffset)
70 return -EINVAL;
71 if (var->yoffset > var->yres_virtual)
72 return -EINVAL;
73 if ((ypan==1) && var->yoffset+var->yres > var->yres_virtual)
74 return -EINVAL;
76 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
78 __asm__ __volatile__(
79 "call *(%%edi)"
80 : /* no return value */
81 : "a" (0x4f07), /* EAX */
82 "b" (0), /* EBX */
83 "c" (offset), /* ECX */
84 "d" (offset >> 16), /* EDX */
85 "D" (&pmi_start)); /* EDI */
86 #endif
87 return 0;
90 static void vesa_setpalette(int regno, unsigned red, unsigned green,
91 unsigned blue, struct fb_var_screeninfo *var)
93 #ifdef __i386__
94 struct { u_char blue, green, red, pad; } entry;
95 int shift = 16 - var->green.length;
97 if (pmi_setpal) {
98 entry.red = red >> shift;
99 entry.green = green >> shift;
100 entry.blue = blue >> shift;
101 entry.pad = 0;
102 __asm__ __volatile__(
103 "call *(%%esi)"
104 : /* no return value */
105 : "a" (0x4f09), /* EAX */
106 "b" (0), /* EBX */
107 "c" (1), /* ECX */
108 "d" (regno), /* EDX */
109 "D" (&entry), /* EDI */
110 "S" (&pmi_pal)); /* ESI */
111 } else {
112 /* without protected mode interface, try VGA registers... */
113 outb_p(regno, dac_reg);
114 outb_p(red >> shift, dac_val);
115 outb_p(green >> shift, dac_val);
116 outb_p(blue >> shift, dac_val);
118 #endif
121 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
122 unsigned blue, unsigned transp,
123 struct fb_info *info)
126 * Set a single color register. The values supplied are
127 * already rounded down to the hardware's capabilities
128 * (according to the entries in the `var' structure). Return
129 * != 0 for invalid regno.
132 if (regno >= info->cmap.len)
133 return 1;
135 switch (info->var.bits_per_pixel) {
136 case 8:
137 vesa_setpalette(regno,red,green,blue, &info->var);
138 break;
139 case 16:
140 if (info->var.red.offset == 10) {
141 /* 1:5:5:5 */
142 ((u32*) (info->pseudo_palette))[regno] =
143 ((red & 0xf800) >> 1) |
144 ((green & 0xf800) >> 6) |
145 ((blue & 0xf800) >> 11);
146 } else {
147 /* 0:5:6:5 */
148 ((u32*) (info->pseudo_palette))[regno] =
149 ((red & 0xf800) ) |
150 ((green & 0xfc00) >> 5) |
151 ((blue & 0xf800) >> 11);
153 break;
154 case 24:
155 red >>= 8;
156 green >>= 8;
157 blue >>= 8;
158 ((u32 *)(info->pseudo_palette))[regno] =
159 (red << info->var.red.offset) |
160 (green << info->var.green.offset) |
161 (blue << info->var.blue.offset);
162 break;
163 case 32:
164 red >>= 8;
165 green >>= 8;
166 blue >>= 8;
167 ((u32 *)(info->pseudo_palette))[regno] =
168 (red << info->var.red.offset) |
169 (green << info->var.green.offset) |
170 (blue << info->var.blue.offset);
171 break;
173 return 0;
176 static struct fb_ops vesafb_ops = {
177 .owner = THIS_MODULE,
178 .fb_setcolreg = vesafb_setcolreg,
179 .fb_pan_display = vesafb_pan_display,
180 .fb_fillrect = cfb_fillrect,
181 .fb_copyarea = cfb_copyarea,
182 .fb_imageblit = cfb_imageblit,
183 .fb_cursor = soft_cursor,
186 int __init vesafb_setup(char *options)
188 char *this_opt;
190 if (!options || !*options)
191 return 0;
193 while ((this_opt = strsep(&options, ",")) != NULL) {
194 if (!*this_opt) continue;
196 if (! strcmp(this_opt, "inverse"))
197 inverse=1;
198 else if (! strcmp(this_opt, "redraw"))
199 ypan=0;
200 else if (! strcmp(this_opt, "ypan"))
201 ypan=1;
202 else if (! strcmp(this_opt, "ywrap"))
203 ypan=2;
204 else if (! strcmp(this_opt, "vgapal"))
205 pmi_setpal=0;
206 else if (! strcmp(this_opt, "pmipal"))
207 pmi_setpal=1;
208 else if (! strcmp(this_opt, "mtrr"))
209 mtrr=1;
210 else if (! strcmp(this_opt, "nomtrr"))
211 mtrr=0;
212 else if (! strncmp(this_opt, "vram:", 5))
213 vram = simple_strtoul(this_opt+5, NULL, 0);
215 return 0;
218 static int __init vesafb_probe(struct device *device)
220 struct platform_device *dev = to_platform_device(device);
221 struct fb_info *info;
222 int i, err;
224 if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
225 return -ENXIO;
227 vesafb_fix.smem_start = screen_info.lfb_base;
228 vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
229 if (15 == vesafb_defined.bits_per_pixel)
230 vesafb_defined.bits_per_pixel = 16;
231 vesafb_defined.xres = screen_info.lfb_width;
232 vesafb_defined.yres = screen_info.lfb_height;
233 vesafb_fix.line_length = screen_info.lfb_linelength;
235 /* Allocate enough memory for double buffering */
236 vesafb_fix.smem_len = screen_info.lfb_width * screen_info.lfb_height * vesafb_defined.bits_per_pixel >> 2;
238 /* check that we don't remap more memory than old cards have */
239 if (vesafb_fix.smem_len > (screen_info.lfb_size * 65536))
240 vesafb_fix.smem_len = screen_info.lfb_size * 65536;
242 /* Set video size according to vram boot option */
243 if (vram)
244 vesafb_fix.smem_len = vram * 1024 * 1024;
246 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ?
247 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
249 /* limit framebuffer size to 16 MB. Otherwise we'll eat tons of
250 * kernel address space for nothing if the gfx card has alot of
251 * memory (>= 128 MB isn't uncommon these days ...) */
252 if (vesafb_fix.smem_len > 16 * 1024 * 1024)
253 vesafb_fix.smem_len = 16 * 1024 * 1024;
255 #ifndef __i386__
256 screen_info.vesapm_seg = 0;
257 #endif
259 if (!request_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len, "vesafb")) {
260 printk(KERN_WARNING
261 "vesafb: abort, cannot reserve video memory at 0x%lx\n",
262 vesafb_fix.smem_start);
263 /* We cannot make this fatal. Sometimes this comes from magic
264 spaces our resource handlers simply don't know about */
267 info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
268 if (!info) {
269 release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
270 return -ENOMEM;
272 info->pseudo_palette = info->par;
273 info->par = NULL;
275 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
276 if (!info->screen_base) {
277 printk(KERN_ERR
278 "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
279 vesafb_fix.smem_len, vesafb_fix.smem_start);
280 err = -EIO;
281 goto err;
284 printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
285 vesafb_fix.smem_start, info->screen_base, vesafb_fix.smem_len/1024);
286 printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
287 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
289 if (screen_info.vesapm_seg) {
290 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
291 screen_info.vesapm_seg,screen_info.vesapm_off);
294 if (screen_info.vesapm_seg < 0xc000)
295 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
297 if (ypan || pmi_setpal) {
298 pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
299 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
300 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]);
301 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
302 if (pmi_base[3]) {
303 printk(KERN_INFO "vesafb: pmi: ports = ");
304 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
305 printk("%x ",pmi_base[i]);
306 printk("\n");
307 if (pmi_base[i] != 0xffff) {
309 * memory areas not supported (yet?)
311 * Rules are: we have to set up a descriptor for the requested
312 * memory area and pass it in the ES register to the BIOS function.
314 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
315 ypan = pmi_setpal = 0;
320 vesafb_defined.xres_virtual = vesafb_defined.xres;
321 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
322 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
323 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
324 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
325 } else {
326 printk(KERN_INFO "vesafb: scrolling: redraw\n");
327 vesafb_defined.yres_virtual = vesafb_defined.yres;
328 ypan = 0;
331 /* some dummy values for timing to make fbset happy */
332 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
333 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8;
334 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8;
336 vesafb_defined.red.offset = screen_info.red_pos;
337 vesafb_defined.red.length = screen_info.red_size;
338 vesafb_defined.green.offset = screen_info.green_pos;
339 vesafb_defined.green.length = screen_info.green_size;
340 vesafb_defined.blue.offset = screen_info.blue_pos;
341 vesafb_defined.blue.length = screen_info.blue_size;
342 vesafb_defined.transp.offset = screen_info.rsvd_pos;
343 vesafb_defined.transp.length = screen_info.rsvd_size;
344 printk(KERN_INFO "vesafb: %s: "
345 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
346 (vesafb_defined.bits_per_pixel > 8) ?
347 "Truecolor" : "Pseudocolor",
348 screen_info.rsvd_size,
349 screen_info.red_size,
350 screen_info.green_size,
351 screen_info.blue_size,
352 screen_info.rsvd_pos,
353 screen_info.red_pos,
354 screen_info.green_pos,
355 screen_info.blue_pos);
357 vesafb_fix.ypanstep = ypan ? 1 : 0;
358 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
360 /* request failure does not faze us, as vgacon probably has this
361 * region already (FIXME) */
362 request_region(0x3c0, 32, "vesafb");
364 if (mtrr) {
365 int temp_size = vesafb_fix.smem_len;
366 /* Find the largest power-of-two */
367 while (temp_size & (temp_size - 1))
368 temp_size &= (temp_size - 1);
370 /* Try and find a power of two to add */
371 while (temp_size && mtrr_add(vesafb_fix.smem_start, temp_size, MTRR_TYPE_WRCOMB, 1)==-EINVAL) {
372 temp_size >>= 1;
376 info->fbops = &vesafb_ops;
377 info->var = vesafb_defined;
378 info->fix = vesafb_fix;
379 info->flags = FBINFO_FLAG_DEFAULT |
380 (ypan) ? FBINFO_HWACCEL_YPAN : 0;
382 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
383 err = -ENXIO;
384 goto err;
386 if (register_framebuffer(info)<0) {
387 err = -EINVAL;
388 fb_dealloc_cmap(&info->cmap);
389 goto err;
391 printk(KERN_INFO "fb%d: %s frame buffer device\n",
392 info->node, info->fix.id);
393 return 0;
394 err:
395 framebuffer_release(info);
396 release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
397 return err;
400 static struct device_driver vesafb_driver = {
401 .name = "vesafb",
402 .bus = &platform_bus_type,
403 .probe = vesafb_probe,
406 static struct platform_device vesafb_device = {
407 .name = "vesafb",
410 int __init vesafb_init(void)
412 int ret;
413 char *option = NULL;
415 /* ignore error return of fb_get_options */
416 fb_get_options("vesafb", &option);
417 vesafb_setup(option);
418 ret = driver_register(&vesafb_driver);
420 if (!ret) {
421 ret = platform_device_register(&vesafb_device);
422 if (ret)
423 driver_unregister(&vesafb_driver);
425 return ret;
427 module_init(vesafb_init);
430 * Overrides for Emacs so that we follow Linus's tabbing style.
431 * ---------------------------------------------------------------------------
432 * Local variables:
433 * c-basic-offset: 8
434 * End:
437 MODULE_LICENSE("GPL");