aboutsummaryrefslogtreecommitdiff
path: root/drivers/video/geode/gxfb_core.c
blob: 484118926318f40b7f97fcdda06336e1cae95334 (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
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
/*
 * Geode GX framebuffer driver.
 *
 *   Copyright (C) 2006 Arcom Control Systems Ltd.
 *
 *   This program is free software; you can redistribute it and/or modify it
 *   under the terms of the GNU General Public License as published by the
 *   Free Software Foundation; either version 2 of the License, or (at your
 *   option) any later version.
 *
 *
 * This driver assumes that the BIOS has created a virtual PCI device header
 * for the video device. The PCI header is assumed to contain the following
 * BARs:
 *
 *    BAR0 - framebuffer memory
 *    BAR1 - graphics processor registers
 *    BAR2 - display controller registers
 *    BAR3 - video processor and flat panel control registers.
 *
 * 16 MiB of framebuffer memory is assumed to be available.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/console.h>
#include <linux/suspend.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <asm/geode.h>

#include "gxfb.h"

static char *mode_option;
static int vram;
static int vt_switch;

/* Modes relevant to the GX (taken from modedb.c) */
static struct fb_videomode gx_modedb[] __initdata = {
	/* 640x480-60 VESA */
	{ NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 640x480-75 VESA */
	{ NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 640x480-85 VESA */
	{ NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 800x600-60 VESA */
	{ NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 800x600-75 VESA */
	{ NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 800x600-85 VESA */
	{ NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 1024x768-60 VESA */
	{ NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 1024x768-75 VESA */
	{ NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 1024x768-85 VESA */
	{ NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 1280x960-60 VESA */
	{ NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 1280x960-85 VESA */
	{ NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 1280x1024-60 VESA */
	{ NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 1280x1024-75 VESA */
	{ NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 1280x1024-85 VESA */
	{ NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 1600x1200-60 VESA */
	{ NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 1600x1200-75 VESA */
	{ NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
	/* 1600x1200-85 VESA */
	{ NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
};

#ifdef CONFIG_OLPC
#include <asm/olpc.h>

static struct fb_videomode gx_dcon_modedb[] __initdata = {
	/* The only mode the DCON has is 1200x900 */
	{ NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 }
};

static void __init get_modedb(struct fb_videomode **modedb, unsigned int *size)
{
	if (olpc_has_dcon()) {
		*modedb = (struct fb_videomode *) gx_dcon_modedb;
		*size = ARRAY_SIZE(gx_dcon_modedb);
	} else {
		*modedb = (struct fb_videomode *) gx_modedb;
		*size = ARRAY_SIZE(gx_modedb);
	}
}

#else
static void __init get_modedb(struct fb_videomode **modedb, unsigned int *size)
{
	*modedb = (struct fb_videomode *) gx_modedb;
	*size = ARRAY_SIZE(gx_modedb);
}
#endif

static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	if (var->xres > 1600 || var->yres > 1200)
		return -EINVAL;
	if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
		return -EINVAL;

	if (var->bits_per_pixel == 32) {
		var->red.offset   = 16; var->red.length   = 8;
		var->green.offset =  8; var->green.length = 8;
		var->blue.offset  =  0; var->blue.length  = 8;
	} else if (var->bits_per_pixel == 16) {
		var->red.offset   = 11; var->red.length   = 5;
		var->green.offset =  5; var->green.length = 6;
		var->blue.offset  =  0; var->blue.length  = 5;
	} else if (var->bits_per_pixel == 8) {
		var->red.offset   = 0; var->red.length   = 8;
		var->green.offset = 0; var->green.length = 8;
		var->blue.offset  = 0; var->blue.length  = 8;
	} else
		return -EINVAL;
	var->transp.offset = 0; var->transp.length = 0;

	/* Enough video memory? */
	if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
		return -EINVAL;

	/* FIXME: Check timing parameters here? */

	return 0;
}

static int gxfb_set_par(struct fb_info *info)
{
	if (info->var.bits_per_pixel > 8) {
		info->fix.visual = FB_VISUAL_TRUECOLOR;
		fb_dealloc_cmap(&info->cmap);
	} else {
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
	}

	info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);

	gx_set_mode(info);

	return 0;
}

static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
{
	chan &= 0xffff;
	chan >>= 16 - bf->length;
	return chan << bf->offset;
}

static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
			   unsigned blue, unsigned transp,
			   struct fb_info *info)
{
	if (info->var.grayscale) {
		/* grayscale = 0.30*R + 0.59*G + 0.11*B */
		red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
	}

	/* Truecolor has hardware independent palette */
	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
		u32 *pal = info->pseudo_palette;
		u32 v;

		if (regno >= 16)
			return -EINVAL;

		v  = chan_to_field(red, &info->var.red);
		v |= chan_to_field(green, &info->var.green);
		v |= chan_to_field(blue, &info->var.blue);

		pal[regno] = v;
	} else {
		if (regno >= 256)
			return -EINVAL;

		gx_set_hw_palette_reg(info, regno, red, green, blue);
	}

	return 0;
}

static int gxfb_blank(int blank_mode, struct fb_info *info)
{
	return gx_blank_display(info, blank_mode);
}

static int __init gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
{
	struct gxfb_par *par = info->par;
	int ret;

	ret = pci_enable_device(dev);
	if (ret < 0)
		return ret;

	ret = pci_request_region(dev, 3, "gxfb (video processor)");
	if (ret < 0)
		return ret;
	par->vid_regs = pci_ioremap_bar(dev, 3);
	if (!par->vid_regs)
		return -ENOMEM;

	ret = pci_request_region(dev, 2, "gxfb (display controller)");
	if (ret < 0)
		return ret;
	par->dc_regs = pci_ioremap_bar(dev, 2);
	if (!par->dc_regs)
		return -ENOMEM;

	ret = pci_request_region(dev, 1, "gxfb (graphics processor)");
	if (ret < 0)
		return ret;
	par->gp_regs = pci_ioremap_bar(dev, 1);

	if (!par->gp_regs)
		return -ENOMEM;

	ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
	if (ret < 0)
		return ret;

	info->fix.smem_start = pci_resource_start(dev, 0);
	info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
	if (!info->screen_base)
		return -ENOMEM;

	/* Set the 16MiB aligned base address of the graphics memory region
	 * in the display controller */

	write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);

	dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
		 info->fix.smem_len / 1024, info->fix.smem_start);

	return 0;
}

static struct fb_ops gxfb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= gxfb_check_var,
	.fb_set_par	= gxfb_set_par,
	.fb_setcolreg	= gxfb_setcolreg,
	.fb_blank       = gxfb_blank,
	/* No HW acceleration for now. */
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};

static struct fb_info * __init gxfb_init_fbinfo(struct device *dev)
{
	struct gxfb_par *par;
	struct fb_info *info;

	/* Alloc enough space for the pseudo palette. */
	info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16,
			dev);
	if (!info)
		return NULL;

	par = info->par;

	strcpy(info->fix.id, "Geode GX");

	info->fix.type		= FB_TYPE_PACKED_PIXELS;
	info->fix.type_aux	= 0;
	info->fix.xpanstep	= 0;
	info->fix.ypanstep	= 0;
	info->fix.ywrapstep	= 0;
	info->fix.accel		= FB_ACCEL_NONE;

	info->var.nonstd	= 0;
	info->var.activate	= FB_ACTIVATE_NOW;
	info->var.height	= -1;
	info->var.width	= -1;
	info->var.accel_flags = 0;
	info->var.vmode	= FB_VMODE_NONINTERLACED;

	info->fbops		= &gxfb_ops;
	info->flags		= FBINFO_DEFAULT;
	info->node		= -1;

	info->pseudo_palette	= (void *)par + sizeof(struct gxfb_par);

	info->var.grayscale	= 0;

	return info;
}

#ifdef CONFIG_PM
static int gxfb_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct fb_info *info = pci_get_drvdata(pdev);

	if (state.event == PM_EVENT_SUSPEND) {
		acquire_console_sem();
		gx_powerdown(info);
		fb_set_suspend(info, 1);
		release_console_sem();
	}

	/* there's no point in setting PCI states; we emulate PCI, so
	 * we don't end up getting power savings anyways */

	return 0;
}

static int gxfb_resume(struct pci_dev *pdev)
{
	struct fb_info *info = pci_get_drvdata(pdev);
	int ret;

	acquire_console_sem();
	ret = gx_powerup(info);
	if (ret) {
		printk(KERN_ERR "gxfb:  power up failed!\n");
		return ret;
	}

	fb_set_suspend(info, 0);
	release_console_sem();
	return 0;
}
#endif

static int __init gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct gxfb_par *par;
	struct fb_info *info;
	int ret;
	unsigned long val;

	struct fb_videomode *modedb_ptr;
	unsigned int modedb_size;

	info = gxfb_init_fbinfo(&pdev->dev);
	if (!info)
		return -ENOMEM;
	par = info->par;

	if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
		dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
		goto err;
	}

	/* Figure out if this is a TFT or CRT part */

	rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);

	if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
		par->enable_crt = 0;
	else
		par->enable_crt = 1;

	get_modedb(&modedb_ptr, &modedb_size);
	ret = fb_find_mode(&info->var, info, mode_option,
			   modedb_ptr, modedb_size, NULL, 16);
	if (ret == 0 || ret == 4) {
		dev_err(&pdev->dev, "could not find valid video mode\n");
		ret = -EINVAL;
		goto err;
	}


	/* Clear the frame buffer of garbage. */
        memset_io(info->screen_base, 0, info->fix.smem_len);

	gxfb_check_var(&info->var, info);
	gxfb_set_par(info);

	pm_set_vt_switch(vt_switch);

	if (register_framebuffer(info) < 0) {
		ret = -EINVAL;
		goto err;
	}
	pci_set_drvdata(pdev, info);
	printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id);
	return 0;

  err:
	if (info->screen_base) {
		iounmap(info->screen_base);
		pci_release_region(pdev, 0);
	}
	if (par->vid_regs) {
		iounmap(par->vid_regs);
		pci_release_region(pdev, 3);
	}
	if (par->dc_regs) {
		iounmap(par->dc_regs);
		pci_release_region(pdev, 2);
	}
	if (par->gp_regs) {
		iounmap(par->gp_regs);
		pci_release_region(pdev, 1);
	}

	if (info)
		framebuffer_release(info);
	return ret;
}

static void gxfb_remove(struct pci_dev *pdev)
{
	struct fb_info *info = pci_get_drvdata(pdev);
	struct gxfb_par *par = info->par;

	unregister_framebuffer(info);

	iounmap((void __iomem *)info->screen_base);
	pci_release_region(pdev, 0);

	iounmap(par->vid_regs);
	pci_release_region(pdev, 3);

	iounmap(par->dc_regs);
	pci_release_region(pdev, 2);

	iounmap(par->gp_regs);
	pci_release_region(pdev, 1);

	pci_set_drvdata(pdev, NULL);

	framebuffer_release(info);
}

static struct pci_device_id gxfb_id_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, gxfb_id_table);

static struct pci_driver gxfb_driver = {
	.name		= "gxfb",
	.id_table	= gxfb_id_table,
	.probe		= gxfb_probe,
	.remove		= gxfb_remove,
#ifdef CONFIG_PM
	.suspend	= gxfb_suspend,
	.resume		= gxfb_resume,
#endif
};

#ifndef MODULE
static int __init gxfb_setup(char *options)
{

	char *opt;

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

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

		mode_option = opt;
	}

	return 0;
}
#endif

static int __init gxfb_init(void)
{
#ifndef MODULE
	char *option = NULL;

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

	gxfb_setup(option);
#endif
	return pci_register_driver(&gxfb_driver);
}

static void __exit gxfb_cleanup(void)
{
	pci_unregister_driver(&gxfb_driver);
}

module_init(gxfb_init);
module_exit(gxfb_cleanup);

module_param(mode_option, charp, 0);
MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");

module_param(vram, int, 0);
MODULE_PARM_DESC(vram, "video memory size");

module_param(vt_switch, int, 0);
MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");

MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
MODULE_LICENSE("GPL");