Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming...
[firefly-linux-kernel-4.4.55.git] / drivers / video / fbdev / vesafb.c
1 /*
2  * framebuffer driver for VBE 2.0 compliant graphic boards
3  *
4  * switching to graphics mode happens at boot time (while
5  * running in real mode, see arch/i386/boot/video.S).
6  *
7  * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
8  *
9  */
10
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/delay.h>
17 #include <linux/fb.h>
18 #include <linux/ioport.h>
19 #include <linux/init.h>
20 #include <linux/platform_device.h>
21 #include <linux/screen_info.h>
22 #include <linux/io.h>
23
24 #include <video/vga.h>
25
26 #define dac_reg (0x3c8)
27 #define dac_val (0x3c9)
28
29 /* --------------------------------------------------------------------- */
30
31 struct vesafb_par {
32         u32 pseudo_palette[256];
33         int wc_cookie;
34 };
35
36 static struct fb_var_screeninfo vesafb_defined = {
37         .activate       = FB_ACTIVATE_NOW,
38         .height         = -1,
39         .width          = -1,
40         .right_margin   = 32,
41         .upper_margin   = 16,
42         .lower_margin   = 4,
43         .vsync_len      = 4,
44         .vmode          = FB_VMODE_NONINTERLACED,
45 };
46
47 static struct fb_fix_screeninfo vesafb_fix = {
48         .id     = "VESA VGA",
49         .type   = FB_TYPE_PACKED_PIXELS,
50         .accel  = FB_ACCEL_NONE,
51 };
52
53 static int   inverse    __read_mostly;
54 static int   mtrr       __read_mostly;          /* disable mtrr */
55 static int   vram_remap;                        /* Set amount of memory to be used */
56 static int   vram_total;                        /* Set total amount of memory */
57 static int   pmi_setpal __read_mostly = 1;      /* pmi for palette changes ??? */
58 static int   ypan       __read_mostly;          /* 0..nothing, 1..ypan, 2..ywrap */
59 static void  (*pmi_start)(void) __read_mostly;
60 static void  (*pmi_pal)  (void) __read_mostly;
61 static int   depth      __read_mostly;
62 static int   vga_compat __read_mostly;
63 /* --------------------------------------------------------------------- */
64
65 static int vesafb_pan_display(struct fb_var_screeninfo *var,
66                               struct fb_info *info)
67 {
68 #ifdef __i386__
69         int offset;
70
71         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
72
73         __asm__ __volatile__(
74                 "call *(%%edi)"
75                 : /* no return value */
76                 : "a" (0x4f07),         /* EAX */
77                   "b" (0),              /* EBX */
78                   "c" (offset),         /* ECX */
79                   "d" (offset >> 16),   /* EDX */
80                   "D" (&pmi_start));    /* EDI */
81 #endif
82         return 0;
83 }
84
85 static int vesa_setpalette(int regno, unsigned red, unsigned green,
86                             unsigned blue)
87 {
88         int shift = 16 - depth;
89         int err = -EINVAL;
90
91 /*
92  * Try VGA registers first...
93  */
94         if (vga_compat) {
95                 outb_p(regno,       dac_reg);
96                 outb_p(red   >> shift, dac_val);
97                 outb_p(green >> shift, dac_val);
98                 outb_p(blue  >> shift, dac_val);
99                 err = 0;
100         }
101
102 #ifdef __i386__
103 /*
104  * Fallback to the PMI....
105  */
106         if (err && pmi_setpal) {
107                 struct { u_char blue, green, red, pad; } entry;
108
109                 entry.red   = red   >> shift;
110                 entry.green = green >> shift;
111                 entry.blue  = blue  >> shift;
112                 entry.pad   = 0;
113                 __asm__ __volatile__(
114                 "call *(%%esi)"
115                 : /* no return value */
116                 : "a" (0x4f09),         /* EAX */
117                   "b" (0),              /* EBX */
118                   "c" (1),              /* ECX */
119                   "d" (regno),          /* EDX */
120                   "D" (&entry),         /* EDI */
121                   "S" (&pmi_pal));      /* ESI */
122                 err = 0;
123         }
124 #endif
125
126         return err;
127 }
128
129 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
130                             unsigned blue, unsigned transp,
131                             struct fb_info *info)
132 {
133         int err = 0;
134
135         /*
136          *  Set a single color register. The values supplied are
137          *  already rounded down to the hardware's capabilities
138          *  (according to the entries in the `var' structure). Return
139          *  != 0 for invalid regno.
140          */
141         
142         if (regno >= info->cmap.len)
143                 return 1;
144
145         if (info->var.bits_per_pixel == 8)
146                 err = vesa_setpalette(regno,red,green,blue);
147         else if (regno < 16) {
148                 switch (info->var.bits_per_pixel) {
149                 case 16:
150                         if (info->var.red.offset == 10) {
151                                 /* 1:5:5:5 */
152                                 ((u32*) (info->pseudo_palette))[regno] =
153                                         ((red   & 0xf800) >>  1) |
154                                         ((green & 0xf800) >>  6) |
155                                         ((blue  & 0xf800) >> 11);
156                         } else {
157                                 /* 0:5:6:5 */
158                                 ((u32*) (info->pseudo_palette))[regno] =
159                                         ((red   & 0xf800)      ) |
160                                         ((green & 0xfc00) >>  5) |
161                                         ((blue  & 0xf800) >> 11);
162                         }
163                         break;
164                 case 24:
165                 case 32:
166                         red   >>= 8;
167                         green >>= 8;
168                         blue  >>= 8;
169                         ((u32 *)(info->pseudo_palette))[regno] =
170                                 (red   << info->var.red.offset)   |
171                                 (green << info->var.green.offset) |
172                                 (blue  << info->var.blue.offset);
173                         break;
174                 }
175         }
176
177         return err;
178 }
179
180 static void vesafb_destroy(struct fb_info *info)
181 {
182         struct vesafb_par *par = info->par;
183
184         fb_dealloc_cmap(&info->cmap);
185         arch_phys_wc_del(par->wc_cookie);
186         if (info->screen_base)
187                 iounmap(info->screen_base);
188         release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
189 }
190
191 static struct fb_ops vesafb_ops = {
192         .owner          = THIS_MODULE,
193         .fb_destroy     = vesafb_destroy,
194         .fb_setcolreg   = vesafb_setcolreg,
195         .fb_pan_display = vesafb_pan_display,
196         .fb_fillrect    = cfb_fillrect,
197         .fb_copyarea    = cfb_copyarea,
198         .fb_imageblit   = cfb_imageblit,
199 };
200
201 static int vesafb_setup(char *options)
202 {
203         char *this_opt;
204         
205         if (!options || !*options)
206                 return 0;
207         
208         while ((this_opt = strsep(&options, ",")) != NULL) {
209                 if (!*this_opt) continue;
210                 
211                 if (! strcmp(this_opt, "inverse"))
212                         inverse=1;
213                 else if (! strcmp(this_opt, "redraw"))
214                         ypan=0;
215                 else if (! strcmp(this_opt, "ypan"))
216                         ypan=1;
217                 else if (! strcmp(this_opt, "ywrap"))
218                         ypan=2;
219                 else if (! strcmp(this_opt, "vgapal"))
220                         pmi_setpal=0;
221                 else if (! strcmp(this_opt, "pmipal"))
222                         pmi_setpal=1;
223                 else if (! strncmp(this_opt, "mtrr:", 5))
224                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
225                 else if (! strcmp(this_opt, "nomtrr"))
226                         mtrr=0;
227                 else if (! strncmp(this_opt, "vtotal:", 7))
228                         vram_total = simple_strtoul(this_opt+7, NULL, 0);
229                 else if (! strncmp(this_opt, "vremap:", 7))
230                         vram_remap = simple_strtoul(this_opt+7, NULL, 0);
231         }
232         return 0;
233 }
234
235 static int vesafb_probe(struct platform_device *dev)
236 {
237         struct fb_info *info;
238         struct vesafb_par *par;
239         int i, err;
240         unsigned int size_vmode;
241         unsigned int size_remap;
242         unsigned int size_total;
243         char *option = NULL;
244
245         /* ignore error return of fb_get_options */
246         fb_get_options("vesafb", &option);
247         vesafb_setup(option);
248
249         if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
250                 return -ENODEV;
251
252         vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
253         vesafb_fix.smem_start = screen_info.lfb_base;
254         vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
255         if (15 == vesafb_defined.bits_per_pixel)
256                 vesafb_defined.bits_per_pixel = 16;
257         vesafb_defined.xres = screen_info.lfb_width;
258         vesafb_defined.yres = screen_info.lfb_height;
259         vesafb_fix.line_length = screen_info.lfb_linelength;
260         vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
261                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
262
263         /*   size_vmode -- that is the amount of memory needed for the
264          *                 used video mode, i.e. the minimum amount of
265          *                 memory we need. */
266         size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
267
268         /*   size_total -- all video memory we have. Used for mtrr
269          *                 entries, resource allocation and bounds
270          *                 checking. */
271         size_total = screen_info.lfb_size * 65536;
272         if (vram_total)
273                 size_total = vram_total * 1024 * 1024;
274         if (size_total < size_vmode)
275                 size_total = size_vmode;
276
277         /*   size_remap -- the amount of video memory we are going to
278          *                 use for vesafb.  With modern cards it is no
279          *                 option to simply use size_total as that
280          *                 wastes plenty of kernel address space. */
281         size_remap  = size_vmode * 2;
282         if (vram_remap)
283                 size_remap = vram_remap * 1024 * 1024;
284         if (size_remap < size_vmode)
285                 size_remap = size_vmode;
286         if (size_remap > size_total)
287                 size_remap = size_total;
288         vesafb_fix.smem_len = size_remap;
289
290 #ifndef __i386__
291         screen_info.vesapm_seg = 0;
292 #endif
293
294         if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
295                 printk(KERN_WARNING
296                        "vesafb: cannot reserve video memory at 0x%lx\n",
297                         vesafb_fix.smem_start);
298                 /* We cannot make this fatal. Sometimes this comes from magic
299                    spaces our resource handlers simply don't know about */
300         }
301
302         info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev);
303         if (!info) {
304                 release_mem_region(vesafb_fix.smem_start, size_total);
305                 return -ENOMEM;
306         }
307         platform_set_drvdata(dev, info);
308         par = info->par;
309         info->pseudo_palette = par->pseudo_palette;
310
311         /* set vesafb aperture size for generic probing */
312         info->apertures = alloc_apertures(1);
313         if (!info->apertures) {
314                 err = -ENOMEM;
315                 goto err;
316         }
317         info->apertures->ranges[0].base = screen_info.lfb_base;
318         info->apertures->ranges[0].size = size_total;
319
320         printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
321                vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
322
323         if (screen_info.vesapm_seg) {
324                 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
325                        screen_info.vesapm_seg,screen_info.vesapm_off);
326         }
327
328         if (screen_info.vesapm_seg < 0xc000)
329                 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
330
331         if (ypan || pmi_setpal) {
332                 unsigned short *pmi_base;
333                 pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
334                 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
335                 pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
336                 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
337                 if (pmi_base[3]) {
338                         printk(KERN_INFO "vesafb: pmi: ports = ");
339                                 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
340                                         printk("%x ",pmi_base[i]);
341                         printk("\n");
342                         if (pmi_base[i] != 0xffff) {
343                                 /*
344                                  * memory areas not supported (yet?)
345                                  *
346                                  * Rules are: we have to set up a descriptor for the requested
347                                  * memory area and pass it in the ES register to the BIOS function.
348                                  */
349                                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
350                                 ypan = pmi_setpal = 0;
351                         }
352                 }
353         }
354
355         if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
356                 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
357                                     "        colors may be incorrect\n");
358                 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
359         }
360
361         vesafb_defined.xres_virtual = vesafb_defined.xres;
362         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
363         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
364                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
365                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
366         } else {
367                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
368                 vesafb_defined.yres_virtual = vesafb_defined.yres;
369                 ypan = 0;
370         }
371
372         /* some dummy values for timing to make fbset happy */
373         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
374         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
375         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
376         
377         vesafb_defined.red.offset    = screen_info.red_pos;
378         vesafb_defined.red.length    = screen_info.red_size;
379         vesafb_defined.green.offset  = screen_info.green_pos;
380         vesafb_defined.green.length  = screen_info.green_size;
381         vesafb_defined.blue.offset   = screen_info.blue_pos;
382         vesafb_defined.blue.length   = screen_info.blue_size;
383         vesafb_defined.transp.offset = screen_info.rsvd_pos;
384         vesafb_defined.transp.length = screen_info.rsvd_size;
385
386         if (vesafb_defined.bits_per_pixel <= 8) {
387                 depth = vesafb_defined.green.length;
388                 vesafb_defined.red.length =
389                 vesafb_defined.green.length =
390                 vesafb_defined.blue.length =
391                 vesafb_defined.bits_per_pixel;
392         }
393
394         printk(KERN_INFO "vesafb: %s: "
395                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
396                (vesafb_defined.bits_per_pixel > 8) ?
397                "Truecolor" : (vga_compat || pmi_setpal) ?
398                "Pseudocolor" : "Static Pseudocolor",
399                screen_info.rsvd_size,
400                screen_info.red_size,
401                screen_info.green_size,
402                screen_info.blue_size,
403                screen_info.rsvd_pos,
404                screen_info.red_pos,
405                screen_info.green_pos,
406                screen_info.blue_pos);
407
408         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
409         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
410
411         /* request failure does not faze us, as vgacon probably has this
412          * region already (FIXME) */
413         request_region(0x3c0, 32, "vesafb");
414
415         if (mtrr == 3) {
416                 unsigned int temp_size = size_total;
417
418                 /* Find the largest power-of-two */
419                 temp_size = roundup_pow_of_two(temp_size);
420
421                 /* Try and find a power of two to add */
422                 do {
423                         par->wc_cookie =
424                                 arch_phys_wc_add(vesafb_fix.smem_start,
425                                                  temp_size);
426                         temp_size >>= 1;
427                 } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0);
428
429                 info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
430         } else {
431                 if (mtrr && mtrr != 3)
432                         WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n");
433                 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
434         }
435
436         if (!info->screen_base) {
437                 printk(KERN_ERR
438                        "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
439                         vesafb_fix.smem_len, vesafb_fix.smem_start);
440                 err = -EIO;
441                 goto err;
442         }
443
444         printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
445                "using %dk, total %dk\n",
446                vesafb_fix.smem_start, info->screen_base,
447                size_remap/1024, size_total/1024);
448
449         info->fbops = &vesafb_ops;
450         info->var = vesafb_defined;
451         info->fix = vesafb_fix;
452         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
453                 (ypan ? FBINFO_HWACCEL_YPAN : 0);
454
455         if (!ypan)
456                 info->fbops->fb_pan_display = NULL;
457
458         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
459                 err = -ENOMEM;
460                 goto err;
461         }
462         if (register_framebuffer(info)<0) {
463                 err = -EINVAL;
464                 fb_dealloc_cmap(&info->cmap);
465                 goto err;
466         }
467         fb_info(info, "%s frame buffer device\n", info->fix.id);
468         return 0;
469 err:
470         arch_phys_wc_del(par->wc_cookie);
471         if (info->screen_base)
472                 iounmap(info->screen_base);
473         framebuffer_release(info);
474         release_mem_region(vesafb_fix.smem_start, size_total);
475         return err;
476 }
477
478 static int vesafb_remove(struct platform_device *pdev)
479 {
480         struct fb_info *info = platform_get_drvdata(pdev);
481
482         unregister_framebuffer(info);
483         framebuffer_release(info);
484
485         return 0;
486 }
487
488 static struct platform_driver vesafb_driver = {
489         .driver = {
490                 .name = "vesa-framebuffer",
491         },
492         .probe = vesafb_probe,
493         .remove = vesafb_remove,
494 };
495
496 module_platform_driver(vesafb_driver);
497 MODULE_LICENSE("GPL");