aboutsummaryrefslogtreecommitdiff
path: root/drivers/video/efifb.c
blob: d25df51bb0d2b3160efe478fb4e64f968014ea04 (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
/*
 * Framebuffer driver for EFI/UEFI based system
 *
 * (c) 2006 Edgar Hucek <gimli@dark-green.com>
 * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/platform_device.h>
#include <linux/screen_info.h>
#include <linux/dmi.h>

#include <video/vga.h>

static struct fb_var_screeninfo efifb_defined __initdata = {
	.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 efifb_fix __initdata = {
	.id			= "EFI VGA",
	.type			= FB_TYPE_PACKED_PIXELS,
	.accel			= FB_ACCEL_NONE,
	.visual			= FB_VISUAL_TRUECOLOR,
};

enum {
	M_I17,		/* 17-Inch iMac */
	M_I20,		/* 20-Inch iMac */
	M_I20_SR,	/* 20-Inch iMac (Santa Rosa) */
	M_I24,		/* 24-Inch iMac */
	M_MINI,		/* Mac Mini */
	M_MB,		/* MacBook */
	M_MB_2,		/* MacBook, 2nd rev. */
	M_MB_3,		/* MacBook, 3rd rev. */
	M_MB_SR,	/* MacBook, 2nd gen, (Santa Rosa) */
	M_MBA,		/* MacBook Air */
	M_MBP,		/* MacBook Pro */
	M_MBP_2,	/* MacBook Pro 2nd gen */
	M_MBP_SR,	/* MacBook Pro (Santa Rosa) */
	M_MBP_4,	/* MacBook Pro, 4th gen */
	M_UNKNOWN	/* placeholder */
};

static struct efifb_dmi_info {
	char *optname;
	unsigned long base;
	int stride;
	int width;
	int height;
} dmi_list[] = {
	[M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900 },
	[M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050 }, /* guess */
	[M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050 },
	[M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200 }, /* guess */
	[M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768 },
	[M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800 },
	[M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800 },
	[M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900 },
	[M_MBP_2] = { "mbp2", 0, 0, 0, 0 }, /* placeholder */
	[M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900 },
	[M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200 },
	[M_UNKNOWN] = { NULL, 0, 0, 0, 0 }
};

static int set_system(const struct dmi_system_id *id);

#define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid)		\
	{ set_system, name, {					\
		DMI_MATCH(DMI_BIOS_VENDOR, vendor),		\
		DMI_MATCH(DMI_PRODUCT_NAME, name) },		\
	  &dmi_list[enumid] }

static struct dmi_system_id __initdata dmi_system_table[] = {
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
	/* At least one of these two will be right; maybe both? */
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
	/* At least one of these two will be right; maybe both? */
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
	/* At least one of these two will be right; maybe both? */
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
	/* At least one of these two will be right; maybe both? */
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
	{},
};

static int set_system(const struct dmi_system_id *id)
{
	struct efifb_dmi_info *info = id->driver_data;
	if (info->base == 0)
		return -ENODEV;

	printk(KERN_INFO "efifb: dmi detected %s - framebuffer at %p "
			 "(%dx%d, stride %d)\n", id->ident,
			 (void *)info->base, info->width, info->height,
			 info->stride);

	/* Trust the bootloader over the DMI tables */
	if (screen_info.lfb_base == 0)
		screen_info.lfb_base = info->base;
	if (screen_info.lfb_linelength == 0)
		screen_info.lfb_linelength = info->stride;
	if (screen_info.lfb_width == 0)
		screen_info.lfb_width = info->width;
	if (screen_info.lfb_height == 0)
		screen_info.lfb_height = info->height;
	if (screen_info.orig_video_isVGA == 0)
		screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;

	return 0;
}

static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
			   unsigned blue, unsigned transp,
			   struct fb_info *info)
{
	/*
	 *  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 (regno < 16) {
		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);
	}
	return 0;
}

static void efifb_destroy(struct fb_info *info)
{
	if (info->screen_base)
		iounmap(info->screen_base);
	release_mem_region(info->aperture_base, info->aperture_size);
	framebuffer_release(info);
}

static struct fb_ops efifb_ops = {
	.owner		= THIS_MODULE,
	.fb_destroy	= efifb_destroy,
	.fb_setcolreg	= efifb_setcolreg,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};

static int __init efifb_setup(char *options)
{
	char *this_opt;
	int i;

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

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

		for (i = 0; i < M_UNKNOWN; i++) {
			if (!strcmp(this_opt, dmi_list[i].optname) &&
					dmi_list[i].base != 0) {
				screen_info.lfb_base = dmi_list[i].base;
				screen_info.lfb_linelength = dmi_list[i].stride;
				screen_info.lfb_width = dmi_list[i].width;
				screen_info.lfb_height = dmi_list[i].height;
			}
		}
		if (!strncmp(this_opt, "base:", 5))
			screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
		else if (!strncmp(this_opt, "stride:", 7))
			screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
		else if (!strncmp(this_opt, "height:", 7))
			screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
		else if (!strncmp(this_opt, "width:", 6))
			screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
	}
	return 0;
}

static int __init efifb_probe(struct platform_device *dev)
{
	struct fb_info *info;
	int err;
	unsigned int size_vmode;
	unsigned int size_remap;
	unsigned int size_total;
	int request_succeeded = 0;

	if (!screen_info.lfb_depth)
		screen_info.lfb_depth = 32;
	if (!screen_info.pages)
		screen_info.pages = 1;
	if (!screen_info.lfb_base) {
		printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
		return -ENODEV;
	}
	printk(KERN_INFO "efifb: probing for efifb\n");

	/* just assume they're all unset if any are */
	if (!screen_info.blue_size) {
		screen_info.blue_size = 8;
		screen_info.blue_pos = 0;
		screen_info.green_size = 8;
		screen_info.green_pos = 8;
		screen_info.red_size = 8;
		screen_info.red_pos = 16;
		screen_info.rsvd_size = 8;
		screen_info.rsvd_pos = 24;
	}

	efifb_fix.smem_start = screen_info.lfb_base;
	efifb_defined.bits_per_pixel = screen_info.lfb_depth;
	efifb_defined.xres = screen_info.lfb_width;
	efifb_defined.yres = screen_info.lfb_height;
	efifb_fix.line_length = screen_info.lfb_linelength;

	/*   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 = efifb_defined.yres * efifb_fix.line_length;

	/*   size_total -- all video memory we have. Used for
	 *                 entries, ressource allocation and bounds
	 *                 checking. */
	size_total = screen_info.lfb_size;
	if (size_total < size_vmode)
		size_total = size_vmode;

	/*   size_remap -- the amount of video memory we are going to
	 *                 use for efifb.  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 (size_remap > size_total)
		size_remap = size_total;
	if (size_remap % PAGE_SIZE)
		size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
	efifb_fix.smem_len = size_remap;

	if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
		request_succeeded = 1;
	} else {
		/* We cannot make this fatal. Sometimes this comes from magic
		   spaces our resource handlers simply don't know about */
		printk(KERN_WARNING
		       "efifb: cannot reserve video memory at 0x%lx\n",
			efifb_fix.smem_start);
	}

	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
	if (!info) {
		printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
		err = -ENOMEM;
		goto err_release_mem;
	}
	info->pseudo_palette = info->par;
	info->par = NULL;

	info->aperture_base = efifb_fix.smem_start;
	info->aperture_size = size_remap;

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

	printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
	       "using %dk, total %dk\n",
	       efifb_fix.smem_start, info->screen_base,
	       size_remap/1024, size_total/1024);
	printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
	       efifb_defined.xres, efifb_defined.yres,
	       efifb_defined.bits_per_pixel, efifb_fix.line_length,
	       screen_info.pages);

	efifb_defined.xres_virtual = efifb_defined.xres;
	efifb_defined.yres_virtual = efifb_fix.smem_len /
					efifb_fix.line_length;
	printk(KERN_INFO "efifb: scrolling: redraw\n");
	efifb_defined.yres_virtual = efifb_defined.yres;

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

	efifb_defined.red.offset    = screen_info.red_pos;
	efifb_defined.red.length    = screen_info.red_size;
	efifb_defined.green.offset  = screen_info.green_pos;
	efifb_defined.green.length  = screen_info.green_size;
	efifb_defined.blue.offset   = screen_info.blue_pos;
	efifb_defined.blue.length   = screen_info.blue_size;
	efifb_defined.transp.offset = screen_info.rsvd_pos;
	efifb_defined.transp.length = screen_info.rsvd_size;

	printk(KERN_INFO "efifb: %s: "
	       "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
	       "Truecolor",
	       screen_info.rsvd_size,
	       screen_info.red_size,
	       screen_info.green_size,
	       screen_info.blue_size,
	       screen_info.rsvd_pos,
	       screen_info.red_pos,
	       screen_info.green_pos,
	       screen_info.blue_pos);

	efifb_fix.ypanstep  = 0;
	efifb_fix.ywrapstep = 0;

	info->fbops = &efifb_ops;
	info->var = efifb_defined;
	info->fix = efifb_fix;
	info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;

	if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
		printk(KERN_ERR "efifb: cannot allocate colormap\n");
		goto err_unmap;
	}
	if ((err = register_framebuffer(info)) < 0) {
		printk(KERN_ERR "efifb: cannot register framebuffer\n");
		goto err_fb_dealoc;
	}
	printk(KERN_INFO "fb%d: %s frame buffer device\n",
		info->node, info->fix.id);
	return 0;

err_fb_dealoc:
	fb_dealloc_cmap(&info->cmap);
err_unmap:
	iounmap(info->screen_base);
err_release_fb:
	framebuffer_release(info);
err_release_mem:
	if (request_succeeded)
		release_mem_region(efifb_fix.smem_start, size_total);
	return err;
}

static struct platform_driver efifb_driver = {
	.probe	= efifb_probe,
	.driver	= {
		.name	= "efifb",
	},
};

static struct platform_device efifb_device = {
	.name	= "efifb",
};

static int __init efifb_init(void)
{
	int ret;
	char *option = NULL;

	dmi_check_system(dmi_system_table);

	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
		return -ENODEV;

	if (fb_get_options("efifb", &option))
		return -ENODEV;
	efifb_setup(option);

	/* We don't get linelength from UGA Draw Protocol, only from
	 * EFI Graphics Protocol.  So if it's not in DMI, and it's not
	 * passed in from the user, we really can't use the framebuffer.
	 */
	if (!screen_info.lfb_linelength)
		return -ENODEV;

	ret = platform_driver_register(&efifb_driver);

	if (!ret) {
		ret = platform_device_register(&efifb_device);
		if (ret)
			platform_driver_unregister(&efifb_driver);
	}
	return ret;
}
module_init(efifb_init);

MODULE_LICENSE("GPL");