summaryrefslogtreecommitdiff
path: root/drivers/video/fbdev/vesafb.c
blob: 8ab64ae4cad3ec4215852bb79a74de62c7c6f69a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
// SPDX-License-Identifier: GPL-2.0-only
/*
 * framebuffer driver for VBE 2.0 compliant graphic boards
 *
 * switching to graphics mode happens at boot time (while
 * running in real mode, see arch/i386/boot/video.S).
 *
 * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
 *
 */

#include <linux/aperture.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/screen_info.h>
#include <linux/io.h>

#include <video/vga.h>

#define dac_reg	(0x3c8)
#define dac_val	(0x3c9)

/* --------------------------------------------------------------------- */

struct vesafb_par {
	u32 pseudo_palette[256];
	resource_size_t base;
	resource_size_t size;
	int wc_cookie;
	struct resource *region;
};

static struct fb_var_screeninfo vesafb_defined = {
	.activate	= FB_ACTIVATE_NOW,
	.height		= -1,
	.width		= -1,
	.right_margin	= 32,
	.upper_margin	= 16,
	.lower_margin	= 4,
	.vsync_len	= 4,
	.vmode		= FB_VMODE_NONINTERLACED,
};

static struct fb_fix_screeninfo vesafb_fix = {
	.id	= "VESA VGA",
	.type	= FB_TYPE_PACKED_PIXELS,
	.accel	= FB_ACCEL_NONE,
};

static int   inverse    __read_mostly;
static int   mtrr       __read_mostly;		/* disable mtrr */
static int   vram_remap;			/* Set amount of memory to be used */
static int   vram_total;			/* Set total amount of memory */
static int   pmi_setpal __read_mostly = 1;	/* pmi for palette changes ??? */
static int   ypan       __read_mostly;		/* 0..nothing, 1..ypan, 2..ywrap */
static void  (*pmi_start)(void) __read_mostly;
static void  (*pmi_pal)  (void) __read_mostly;
static int   depth      __read_mostly;
static int   vga_compat __read_mostly;
/* --------------------------------------------------------------------- */

static int vesafb_pan_display(struct fb_var_screeninfo *var,
                              struct fb_info *info)
{
#ifdef __i386__
	int offset;

	offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;

        __asm__ __volatile__(
                "call *(%%edi)"
                : /* no return value */
                : "a" (0x4f07),         /* EAX */
                  "b" (0),              /* EBX */
                  "c" (offset),         /* ECX */
                  "d" (offset >> 16),   /* EDX */
                  "D" (&pmi_start));    /* EDI */
#endif
	return 0;
}

static int vesa_setpalette(int regno, unsigned red, unsigned green,
			    unsigned blue)
{
	int shift = 16 - depth;
	int err = -EINVAL;

/*
 * Try VGA registers first...
 */
	if (vga_compat) {
		outb_p(regno,       dac_reg);
		outb_p(red   >> shift, dac_val);
		outb_p(green >> shift, dac_val);
		outb_p(blue  >> shift, dac_val);
		err = 0;
	}

#ifdef __i386__
/*
 * Fallback to the PMI....
 */
	if (err && pmi_setpal) {
		struct { u_char blue, green, red, pad; } entry;

		entry.red   = red   >> shift;
		entry.green = green >> shift;
		entry.blue  = blue  >> shift;
		entry.pad   = 0;
	        __asm__ __volatile__(
                "call *(%%esi)"
                : /* no return value */
                : "a" (0x4f09),         /* EAX */
                  "b" (0),              /* EBX */
                  "c" (1),              /* ECX */
                  "d" (regno),          /* EDX */
                  "D" (&entry),         /* EDI */
                  "S" (&pmi_pal));      /* ESI */
		err = 0;
	}
#endif

	return err;
}

static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
			    unsigned blue, unsigned transp,
			    struct fb_info *info)
{
	int err = 0;

	/*
	 *  Set a single color register. The values supplied are
	 *  already rounded down to the hardware's capabilities
	 *  (according to the entries in the `var' structure). Return
	 *  != 0 for invalid regno.
	 */

	if (regno >= info->cmap.len)
		return 1;

	if (info->var.bits_per_pixel == 8)
		err = vesa_setpalette(regno,red,green,blue);
	else if (regno < 16) {
		switch (info->var.bits_per_pixel) {
		case 16:
			if (info->var.red.offset == 10) {
				/* 1:5:5:5 */
				((u32*) (info->pseudo_palette))[regno] =
					((red   & 0xf800) >>  1) |
					((green & 0xf800) >>  6) |
					((blue  & 0xf800) >> 11);
			} else {
				/* 0:5:6:5 */
				((u32*) (info->pseudo_palette))[regno] =
					((red   & 0xf800)      ) |
					((green & 0xfc00) >>  5) |
					((blue  & 0xf800) >> 11);
			}
			break;
		case 24:
		case 32:
			red   >>= 8;
			green >>= 8;
			blue  >>= 8;
			((u32 *)(info->pseudo_palette))[regno] =
				(red   << info->var.red.offset)   |
				(green << info->var.green.offset) |
				(blue  << info->var.blue.offset);
			break;
		}
	}

	return err;
}

/*
 * fb_ops.fb_destroy is called by the last put_fb_info() call at the end
 * of unregister_framebuffer() or fb_release(). Do any cleanup here.
 */
static void vesafb_destroy(struct fb_info *info)
{
	struct vesafb_par *par = info->par;

	fb_dealloc_cmap(&info->cmap);
	arch_phys_wc_del(par->wc_cookie);
	if (info->screen_base)
		iounmap(info->screen_base);
	release_mem_region(par->base, par->size);

	framebuffer_release(info);
}

static struct fb_ops vesafb_ops = {
	.owner		= THIS_MODULE,
	FB_DEFAULT_IOMEM_OPS,
	.fb_destroy     = vesafb_destroy,
	.fb_setcolreg	= vesafb_setcolreg,
	.fb_pan_display	= vesafb_pan_display,
};

static int vesafb_setup(char *options)
{
	char *this_opt;

	if (!options || !*options)
		return 0;

	while ((this_opt = strsep(&options, ",")) != NULL) {
		if (!*this_opt) continue;

		if (! strcmp(this_opt, "inverse"))
			inverse=1;
		else if (! strcmp(this_opt, "redraw"))
			ypan=0;
		else if (! strcmp(this_opt, "ypan"))
			ypan=1;
		else if (! strcmp(this_opt, "ywrap"))
			ypan=2;
		else if (! strcmp(this_opt, "vgapal"))
			pmi_setpal=0;
		else if (! strcmp(this_opt, "pmipal"))
			pmi_setpal=1;
		else if (! strncmp(this_opt, "mtrr:", 5))
			mtrr = simple_strtoul(this_opt+5, NULL, 0);
		else if (! strcmp(this_opt, "nomtrr"))
			mtrr=0;
		else if (! strncmp(this_opt, "vtotal:", 7))
			vram_total = simple_strtoul(this_opt+7, NULL, 0);
		else if (! strncmp(this_opt, "vremap:", 7))
			vram_remap = simple_strtoul(this_opt+7, NULL, 0);
	}
	return 0;
}

static int vesafb_probe(struct platform_device *dev)
{
	struct screen_info *si;
	struct fb_info *info;
	struct vesafb_par *par;
	int i, err;
	unsigned int size_vmode;
	unsigned int size_remap;
	unsigned int size_total;
	char *option = NULL;

	/*
	 * If we fail probing the device, the kernel might try a different
	 * driver. We get a copy of the attached screen_info, so that we can
	 * modify its values without affecting later drivers.
	 */
	si = dev_get_platdata(&dev->dev);
	if (!si)
		return -ENODEV;
	si = devm_kmemdup(&dev->dev, si, sizeof(*si), GFP_KERNEL);
	if (!si)
		return -ENOMEM;

	/* ignore error return of fb_get_options */
	fb_get_options("vesafb", &option);
	vesafb_setup(option);

	if (si->orig_video_isVGA != VIDEO_TYPE_VLFB)
		return -ENODEV;

	vga_compat = (si->capabilities & 2) ? 0 : 1;
	vesafb_fix.smem_start = si->lfb_base;
	vesafb_defined.bits_per_pixel = si->lfb_depth;
	if (15 == vesafb_defined.bits_per_pixel)
		vesafb_defined.bits_per_pixel = 16;
	vesafb_defined.xres = si->lfb_width;
	vesafb_defined.yres = si->lfb_height;
	vesafb_fix.line_length = si->lfb_linelength;
	vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
		FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;

	/*   size_vmode -- that is the amount of memory needed for the
	 *                 used video mode, i.e. the minimum amount of
	 *                 memory we need. */
	size_vmode = vesafb_defined.yres * vesafb_fix.line_length;

	/*   size_total -- all video memory we have. Used for mtrr
	 *                 entries, resource allocation and bounds
	 *                 checking. */
	size_total = si->lfb_size * 65536;
	if (vram_total)
		size_total = vram_total * 1024 * 1024;
	if (size_total < size_vmode)
		size_total = size_vmode;

	/*   size_remap -- the amount of video memory we are going to
	 *                 use for vesafb.  With modern cards it is no
	 *                 option to simply use size_total as that
	 *                 wastes plenty of kernel address space. */
	size_remap  = size_vmode * 2;
	if (vram_remap)
		size_remap = vram_remap * 1024 * 1024;
	if (size_remap < size_vmode)
		size_remap = size_vmode;
	if (size_remap > size_total)
		size_remap = size_total;
	vesafb_fix.smem_len = size_remap;

#ifndef __i386__
	si->vesapm_seg = 0;
#endif

	if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
		printk(KERN_WARNING
		       "vesafb: cannot reserve video memory at 0x%lx\n",
			vesafb_fix.smem_start);
		/* We cannot make this fatal. Sometimes this comes from magic
		   spaces our resource handlers simply don't know about */
	}

	info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev);
	if (!info) {
		release_mem_region(vesafb_fix.smem_start, size_total);
		return -ENOMEM;
	}
	platform_set_drvdata(dev, info);
	par = info->par;
	info->pseudo_palette = par->pseudo_palette;

	par->base = si->lfb_base;
	par->size = size_total;

	printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
	       vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel,
	       vesafb_fix.line_length, si->pages);

	if (si->vesapm_seg) {
		printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
		       si->vesapm_seg, si->vesapm_off);
	}

	if (si->vesapm_seg < 0xc000)
		ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */

	if (ypan || pmi_setpal) {
		unsigned long pmi_phys;
		unsigned short *pmi_base;
		pmi_phys  = ((unsigned long)si->vesapm_seg << 4) + si->vesapm_off;
		pmi_base  = (unsigned short *)phys_to_virt(pmi_phys);
		pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
		pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
		printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
		if (pmi_base[3]) {
			printk(KERN_INFO "vesafb: pmi: ports = ");
			for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
				printk("%x ", pmi_base[i]);
			printk("\n");
			if (pmi_base[i] != 0xffff) {
				/*
				 * memory areas not supported (yet?)
				 *
				 * Rules are: we have to set up a descriptor for the requested
				 * memory area and pass it in the ES register to the BIOS function.
				 */
				printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
				ypan = pmi_setpal = 0;
			}
		}
	}

	if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
		printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
		                    "        colors may be incorrect\n");
		vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
	}

	vesafb_defined.xres_virtual = vesafb_defined.xres;
	vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
	if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
		printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
		       (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
	} else {
		printk(KERN_INFO "vesafb: scrolling: redraw\n");
		vesafb_defined.yres_virtual = vesafb_defined.yres;
		ypan = 0;
	}

	/* some dummy values for timing to make fbset happy */
	vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
	vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
	vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;

	vesafb_defined.red.offset    = si->red_pos;
	vesafb_defined.red.length    = si->red_size;
	vesafb_defined.green.offset  = si->green_pos;
	vesafb_defined.green.length  = si->green_size;
	vesafb_defined.blue.offset   = si->blue_pos;
	vesafb_defined.blue.length   = si->blue_size;
	vesafb_defined.transp.offset = si->rsvd_pos;
	vesafb_defined.transp.length = si->rsvd_size;

	if (vesafb_defined.bits_per_pixel <= 8) {
		depth = vesafb_defined.green.length;
		vesafb_defined.red.length =
		vesafb_defined.green.length =
		vesafb_defined.blue.length =
		vesafb_defined.bits_per_pixel;
	}

	printk(KERN_INFO "vesafb: %s: "
	       "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
	       (vesafb_defined.bits_per_pixel > 8) ?
	       "Truecolor" : (vga_compat || pmi_setpal) ?
	       "Pseudocolor" : "Static Pseudocolor",
	       si->rsvd_size,
	       si->red_size,
	       si->green_size,
	       si->blue_size,
	       si->rsvd_pos,
	       si->red_pos,
	       si->green_pos,
	       si->blue_pos);

	vesafb_fix.ypanstep  = ypan     ? 1 : 0;
	vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;

	/* request failure does not faze us, as vgacon probably has this
	 * region already (FIXME) */
	par->region = request_region(0x3c0, 32, "vesafb");

	if (mtrr == 3) {
		unsigned int temp_size = size_total;

		/* Find the largest power-of-two */
		temp_size = roundup_pow_of_two(temp_size);

		/* Try and find a power of two to add */
		do {
			par->wc_cookie =
				arch_phys_wc_add(vesafb_fix.smem_start,
						 temp_size);
			temp_size >>= 1;
		} while (temp_size >= PAGE_SIZE && par->wc_cookie < 0);

		info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
	} else {
		if (mtrr && mtrr != 3)
			WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n");
		info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
	}

	if (!info->screen_base) {
		printk(KERN_ERR
		       "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
			vesafb_fix.smem_len, vesafb_fix.smem_start);
		err = -EIO;
		goto err_release_region;
	}

	printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
	       "using %dk, total %dk\n",
	       vesafb_fix.smem_start, info->screen_base,
	       size_remap/1024, size_total/1024);

	if (!ypan)
		vesafb_ops.fb_pan_display = NULL;

	info->fbops = &vesafb_ops;
	info->var = vesafb_defined;
	info->fix = vesafb_fix;
	info->flags = (ypan ? FBINFO_HWACCEL_YPAN : 0);

	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
		err = -ENOMEM;
		goto err_release_region;
	}
	err = devm_aperture_acquire_for_platform_device(dev, par->base, par->size);
	if (err)
		goto err_fb_dealloc_cmap;
	if (register_framebuffer(info)<0) {
		err = -EINVAL;
		goto err_fb_dealloc_cmap;
	}
	fb_info(info, "%s frame buffer device\n", info->fix.id);
	return 0;
err_fb_dealloc_cmap:
	fb_dealloc_cmap(&info->cmap);
err_release_region:
	arch_phys_wc_del(par->wc_cookie);
	if (info->screen_base)
		iounmap(info->screen_base);
	if (par->region)
		release_region(0x3c0, 32);
	framebuffer_release(info);
	release_mem_region(vesafb_fix.smem_start, size_total);
	return err;
}

static void vesafb_remove(struct platform_device *pdev)
{
	struct fb_info *info = platform_get_drvdata(pdev);

	if (((struct vesafb_par *)(info->par))->region)
		release_region(0x3c0, 32);

	/* vesafb_destroy takes care of info cleanup */
	unregister_framebuffer(info);
}

static struct platform_driver vesafb_driver = {
	.driver = {
		.name = "vesa-framebuffer",
	},
	.probe = vesafb_probe,
	.remove_new = vesafb_remove,
};

module_platform_driver(vesafb_driver);
MODULE_LICENSE("GPL");