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>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
16 #include <linux/tty.h>
17 #include <linux/slab.h>
18 #include <linux/delay.h>
20 #include <linux/ioport.h>
21 #include <linux/init.h>
23 #include <video/edid.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,
41 .vmode = FB_VMODE_NONINTERLACED,
44 static struct fb_fix_screeninfo vesafb_fix __initdata = {
46 .type = FB_TYPE_PACKED_PIXELS,
47 .accel = FB_ACCEL_NONE,
50 static int inverse = 0;
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,
71 if (var->yoffset > var->yres_virtual)
73 if ((ypan==1) && var->yoffset+var->yres > var->yres_virtual)
76 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
80 : /* no return value */
81 : "a" (0x4f07), /* EAX */
83 "c" (offset), /* ECX */
84 "d" (offset >> 16), /* EDX */
85 "D" (&pmi_start)); /* EDI */
90 static void vesa_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
93 struct { u_char blue, green, red, pad; } entry;
96 entry.red = red >> 10;
97 entry.green = green >> 10;
98 entry.blue = blue >> 10;
100 __asm__ __volatile__(
102 : /* no return value */
103 : "a" (0x4f09), /* EAX */
106 "d" (regno), /* EDX */
107 "D" (&entry), /* EDI */
108 "S" (&pmi_pal)); /* ESI */
110 /* without protected mode interface, try VGA registers... */
111 outb_p(regno, dac_reg);
112 outb_p(red >> 10, dac_val);
113 outb_p(green >> 10, dac_val);
114 outb_p(blue >> 10, dac_val);
119 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
120 unsigned blue, unsigned transp,
121 struct fb_info *info)
124 * Set a single color register. The values supplied are
125 * already rounded down to the hardware's capabilities
126 * (according to the entries in the `var' structure). Return
127 * != 0 for invalid regno.
130 if (regno >= info->cmap.len)
133 switch (info->var.bits_per_pixel) {
135 vesa_setpalette(regno,red,green,blue);
138 if (info->var.red.offset == 10) {
140 ((u32*) (info->pseudo_palette))[regno] =
141 ((red & 0xf800) >> 1) |
142 ((green & 0xf800) >> 6) |
143 ((blue & 0xf800) >> 11);
146 ((u32*) (info->pseudo_palette))[regno] =
148 ((green & 0xfc00) >> 5) |
149 ((blue & 0xf800) >> 11);
156 ((u32 *)(info->pseudo_palette))[regno] =
157 (red << info->var.red.offset) |
158 (green << info->var.green.offset) |
159 (blue << info->var.blue.offset);
165 ((u32 *)(info->pseudo_palette))[regno] =
166 (red << info->var.red.offset) |
167 (green << info->var.green.offset) |
168 (blue << info->var.blue.offset);
174 static struct fb_ops vesafb_ops = {
175 .owner = THIS_MODULE,
176 .fb_setcolreg = vesafb_setcolreg,
177 .fb_pan_display = vesafb_pan_display,
178 .fb_fillrect = cfb_fillrect,
179 .fb_copyarea = cfb_copyarea,
180 .fb_imageblit = cfb_imageblit,
181 .fb_cursor = soft_cursor,
184 int __init vesafb_setup(char *options)
188 if (!options || !*options)
191 while ((this_opt = strsep(&options, ",")) != NULL) {
192 if (!*this_opt) continue;
194 if (! strcmp(this_opt, "inverse"))
196 else if (! strcmp(this_opt, "redraw"))
198 else if (! strcmp(this_opt, "ypan"))
200 else if (! strcmp(this_opt, "ywrap"))
202 else if (! strcmp(this_opt, "vgapal"))
204 else if (! strcmp(this_opt, "pmipal"))
206 else if (! strcmp(this_opt, "mtrr"))
208 else if (! strcmp(this_opt, "nomtrr"))
210 else if (! strncmp(this_opt, "vram:", 5))
211 vram = simple_strtoul(this_opt+5, NULL, 0);
216 static int __init vesafb_probe(struct device *device)
218 struct platform_device *dev = to_platform_device(device);
219 struct fb_info *info;
222 if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
225 vesafb_fix.smem_start = screen_info.lfb_base;
226 vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
227 if (15 == vesafb_defined.bits_per_pixel)
228 vesafb_defined.bits_per_pixel = 16;
229 vesafb_defined.xres = screen_info.lfb_width;
230 vesafb_defined.yres = screen_info.lfb_height;
231 vesafb_fix.line_length = screen_info.lfb_linelength;
233 /* Allocate enough memory for double buffering */
234 vesafb_fix.smem_len = screen_info.lfb_width * screen_info.lfb_height * vesafb_defined.bits_per_pixel >> 2;
236 /* check that we don't remap more memory than old cards have */
237 if (vesafb_fix.smem_len > (screen_info.lfb_size * 65536))
238 vesafb_fix.smem_len = screen_info.lfb_size * 65536;
240 /* Set video size according to vram boot option */
242 vesafb_fix.smem_len = vram * 1024 * 1024;
244 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ?
245 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
247 /* limit framebuffer size to 16 MB. Otherwise we'll eat tons of
248 * kernel address space for nothing if the gfx card has alot of
249 * memory (>= 128 MB isn't uncommon these days ...) */
250 if (vesafb_fix.smem_len > 16 * 1024 * 1024)
251 vesafb_fix.smem_len = 16 * 1024 * 1024;
254 screen_info.vesapm_seg = 0;
257 if (!request_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len, "vesafb")) {
259 "vesafb: abort, cannot reserve video memory at 0x%lx\n",
260 vesafb_fix.smem_start);
261 /* We cannot make this fatal. Sometimes this comes from magic
262 spaces our resource handlers simply don't know about */
265 info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
267 release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
270 info->pseudo_palette = info->par;
273 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
274 if (!info->screen_base) {
276 "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
277 vesafb_fix.smem_len, vesafb_fix.smem_start);
282 printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
283 vesafb_fix.smem_start, info->screen_base, vesafb_fix.smem_len/1024);
284 printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
285 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
287 if (screen_info.vesapm_seg) {
288 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
289 screen_info.vesapm_seg,screen_info.vesapm_off);
292 if (screen_info.vesapm_seg < 0xc000)
293 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
295 if (ypan || pmi_setpal) {
296 pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
297 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
298 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]);
299 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
301 printk(KERN_INFO "vesafb: pmi: ports = ");
302 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
303 printk("%x ",pmi_base[i]);
305 if (pmi_base[i] != 0xffff) {
307 * memory areas not supported (yet?)
309 * Rules are: we have to set up a descriptor for the requested
310 * memory area and pass it in the ES register to the BIOS function.
312 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
313 ypan = pmi_setpal = 0;
318 vesafb_defined.xres_virtual = vesafb_defined.xres;
319 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
320 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
321 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
322 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
324 printk(KERN_INFO "vesafb: scrolling: redraw\n");
325 vesafb_defined.yres_virtual = vesafb_defined.yres;
329 /* some dummy values for timing to make fbset happy */
330 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
331 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8;
332 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8;
334 if (vesafb_defined.bits_per_pixel > 8) {
335 vesafb_defined.red.offset = screen_info.red_pos;
336 vesafb_defined.red.length = screen_info.red_size;
337 vesafb_defined.green.offset = screen_info.green_pos;
338 vesafb_defined.green.length = screen_info.green_size;
339 vesafb_defined.blue.offset = screen_info.blue_pos;
340 vesafb_defined.blue.length = screen_info.blue_size;
341 vesafb_defined.transp.offset = screen_info.rsvd_pos;
342 vesafb_defined.transp.length = screen_info.rsvd_size;
343 printk(KERN_INFO "vesafb: directcolor: "
344 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
345 screen_info.rsvd_size,
346 screen_info.red_size,
347 screen_info.green_size,
348 screen_info.blue_size,
349 screen_info.rsvd_pos,
351 screen_info.green_pos,
352 screen_info.blue_pos);
354 vesafb_defined.red.length = 6;
355 vesafb_defined.green.length = 6;
356 vesafb_defined.blue.length = 6;
359 vesafb_fix.ypanstep = ypan ? 1 : 0;
360 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
362 /* request failure does not faze us, as vgacon probably has this
363 * region already (FIXME) */
364 request_region(0x3c0, 32, "vesafb");
367 int temp_size = vesafb_fix.smem_len;
368 /* Find the largest power-of-two */
369 while (temp_size & (temp_size - 1))
370 temp_size &= (temp_size - 1);
372 /* Try and find a power of two to add */
373 while (temp_size && mtrr_add(vesafb_fix.smem_start, temp_size, MTRR_TYPE_WRCOMB, 1)==-EINVAL) {
378 info->fbops = &vesafb_ops;
379 info->var = vesafb_defined;
380 info->fix = vesafb_fix;
381 info->flags = FBINFO_FLAG_DEFAULT |
382 (ypan) ? FBINFO_HWACCEL_YPAN : 0;
384 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
388 if (register_framebuffer(info)<0) {
390 fb_dealloc_cmap(&info->cmap);
393 printk(KERN_INFO "fb%d: %s frame buffer device\n",
394 info->node, info->fix.id);
397 framebuffer_release(info);
398 release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
402 static struct device_driver vesafb_driver = {
404 .bus = &platform_bus_type,
405 .probe = vesafb_probe,
408 static struct platform_device vesafb_device = {
412 int __init vesafb_init(void)
416 ret = driver_register(&vesafb_driver);
419 ret = platform_device_register(&vesafb_device);
421 driver_unregister(&vesafb_driver);
427 * Overrides for Emacs so that we follow Linus's tabbing style.
428 * ---------------------------------------------------------------------------
434 MODULE_LICENSE("GPL");